JP2006341243A - Coat-type steel plate reinforcing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coat-type steel plate reinforcing material the execution of which can be automated easily and by which the contamination of a chemical treatment liquid can be prevented without deteriorating the reinforcing effect of the coat-type steel plate reinforcing material and a steel plate is not deformed even at low temperature. <P>SOLUTION: The coat-type steel plate reinforcing material 1 is composed of an upper layer part 2 and a lower layer part 3. The upper layer part 2 is about twice as thick as the lower layer part 3, has excellent stiffness and fills the role of mainly reinforcing the steel plate F. The lower layer part 3 is excellent in flexibility and adhesive strength and fills the role of sticking the upper layer part 2 to the steel plate F to prevent the deformation of the steel plate mainly. BR rubber etc. as rubber, a vulcanizing agent, a plasticizer, a filler, a foaming agent 5, acrylic powder, a thermosetting resin or the like are blended in the lower layer part 3. An epoxy resin as a thermosetting resin, a curing agent, a fibrous filler 4, rubber and the foaming agent 5 are blended in the upper layer part 2. As a result, as for the reinforcing property of the coat-type steel plate reinforcing material, flexural rigidity is high and stiffness is excellent. As for the deforming property, the deformation of the steel plate reinforced by this reinforcing material is not found at any of 20°C and -30°C. The contamination of the chemical treatment liquid can be prevented since the chemical treatment liquid is based on an organic compound. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a coated steel plate reinforcing material that is composed of a lower layer portion having flexibility and an upper layer portion having rigidity, and is excellent in reinforcement (rigidity) and distortion resistance used for a vehicle panel or the like.

  2. Description of the Related Art In recent years, vehicle body panels of vehicles such as passenger cars tend to be thin for the purpose of reducing vehicle weight and improving personal protection for improving fuel efficiency. Thus, as the plate thickness of the vehicle body panel becomes thinner, the rigidity and dent resistance of the vehicle body panel will decrease. In contrast, conventionally, a sheet of thermosetting epoxy resin (using glass cloth as a constraining layer), called a panel reinforcement, is applied to the back side of the vehicle body panel, and it is reinforced by heating and curing in a drying furnace. Was. However, such sheet-shaped reinforcements are manually constructed, which hinders automation and impedes shortening of the process time, causes panel distortion due to curing shrinkage, and in the chemical conversion treatment process during the vehicle manufacturing process. There was also a problem that the silicon contained in the glass cloth reacted with hydrogen fluoride in the chemical conversion treatment liquid to reduce the concentration of the chemical conversion treatment liquid. Therefore, as shown in Patent Documents 1, 2, and 3, paint-type steel plate reinforcements that can prevent the concentration reduction of the chemical conversion solution and can be automated by a robot have been developed.

  In the invention shown in Patent Document 1, a constraining layer made of paper impregnated with a synthetic resin, a mixture of rubber and thermoplastic elastomer having a number average molecular weight of 500 to 20000, a filler, a tackifier, a softener, and a crosslinking agent -By using the steel plate reinforcing material which consists of a thermosetting resin layer which mix | blended the foaming agent, it is supposed that the density | concentration reduction of the chemical conversion liquid in a chemical conversion treatment process can be prevented, without reducing a reinforcement effect.

  Moreover, in the invention shown in Patent Document 2, it is composed of two layers of coating material, the intermediate layer is a one-component thermosetting epoxy / urethane paint, the constraining layer is a one-component thermosetting epoxy paint, Liquid-thermosetting epoxy / urethane paints can be applied to the necessary parts by using the coated steel plate reinforcement, which is a paint that foams when heated. It can be performed by a machine, can prevent the steel plate from being distorted due to the shrinkage of the reinforcing material at the time of heat curing, and can obtain a further steel plate reinforcing effect.

Furthermore, in the invention shown in Patent Document 3, a composite steel plate reinforcing material in which a layer made of a coating material on a steel plate and a layer made of a sheet material on the steel plate are laminated and integrated, and as the coating material, Reinforcing effect is reduced by using a mixture of resin / emulsion, liquid rubber such as polybutadiene, water-based resin, solvent-based resin mixed with pigments / flaky fillers and fibrous fillers / additives. It is said that contamination of the chemical conversion treatment liquid in the chemical conversion treatment step can be prevented without any problems.
Japanese Patent Laid-Open No. 10-76586 JP 2001-162222 A JP 2004-314463 A

  However, in the steel plate reinforcement according to Patent Document 1 and Patent Document 3, since a sheet-like material is used, it is still difficult to completely automate the coating-type steel plate reinforcement according to Patent Document 2. Although it is possible to automate, it is considered that the rigidity is slightly too high and the steel sheet is distorted at a low temperature.

  Therefore, the present invention can easily automate the construction, can prevent contamination of the chemical conversion liquid in the chemical conversion treatment process without reducing the reinforcing effect, and does not cause distortion in the steel plate even at low temperatures It is an object to provide a steel plate reinforcing material.

  The coated steel plate reinforcing material according to the invention of claim 1 is a coated steel plate reinforcing material comprising a lower layer portion applied to a steel plate surface and an upper layer portion coated on the lower layer portion, the lower layer portion and The upper layer portion contains an organic compound and / or organic polymer compound as a main component, the upper layer portion is applied to a thickness equal to or greater than the thickness of the lower layer portion, and the lower layer portion is -30 ° C to 20 ° C after drying. The elastic modulus is 0.5 MPa or less and the elongation is in the range of about 100% to about 200%, and the upper layer portion has an elastic modulus in the temperature range of −30 ° C. to 20 ° C. after drying. The elongation is in the range of about 1000 GPa to about 2000 GPa and the elongation is in the range of about 1% to about 3%.

  According to a second aspect of the present invention, there is provided the coated steel sheet reinforcing material according to the first aspect, wherein the lower layer portion includes rubber, a vulcanizing agent, a plasticizer, a foaming agent, and a filler, and the upper layer portion serves as a continuous phase. It has a sea-island microphase separation structure composed of thermosetting resin and latent curing agent or thermosetting elastomer and latent crosslinking agent and rubber as a dispersed phase, and further contains a foaming agent and fibrous filler The rubber is contained in each of the upper layer portion and the lower layer portion in a range of about 5 wt% to about 10 wt%, and the fibrous filler is contained in the upper layer portion from about 20 wt% to about 40 wt%. It is contained within the range of% by weight.

  According to a third aspect of the present invention, there is provided the coated steel plate reinforcing material according to the second aspect, wherein the rubber in the lower layer portion is an anti-vibration rubber such as styrene-butadiene-latex (SBR) rubber.

  According to a fourth aspect of the present invention, there is provided the coated steel plate reinforcing material according to any one of the first to third aspects, wherein the lower layer portion has a thickness of about 0.5 mm to about 3.0 mm. Is applied to a thickness of about 1.5 mm to about 4.0 mm.

  According to a fifth aspect of the present invention, there is provided the coated steel plate reinforcing material according to any one of the second to fourth aspects, wherein the fibrous filler has a diameter of about 5 μm to about 15 μm and a length of about 50 μm to about 200 μm. It is within the range.

  The coated steel sheet reinforcing material according to the invention of claim 1 is composed of upper and lower two layers, the lower layer portion and the upper layer portion contain an organic compound and / or an organic polymer compound as a main component, and the upper layer portion has a thickness equal to or greater than the lower layer portion. The lower layer is dried, and the elastic modulus is 0.5 MPa or less and the elongation is in the range of about 100% to about 200% within the temperature range of −30 ° C. to 20 ° C., and the upper layer is dried. Later, in the temperature range of -30 ° C to 20 ° C, the elastic modulus is in the range of about 1000 GPa to about 2000 GPa and the elongation is in the range of about 1% to about 3%.

  As a result of earnest experiment research, the present inventors have constituted the coated steel plate reinforcing material from upper and lower two layers, the upper layer portion is made to have a thickness greater than the thickness of the lower layer portion, the lower layer portion has flexibility, and the upper layer portion has It has been found that by providing rigidity, both low-temperature distortion resistance and reinforcement (rigidity) can be achieved. Specifically, when the elastic modulus of the lower layer exceeds 0.5 MPa, strain occurs at a low temperature, and when the elongation rate is less than about 100%, strain occurs at a low temperature, and the elongation rate exceeds about 200%. And the rigidity is insufficient and the reinforcement becomes low. Further, if the elastic modulus of the upper layer portion is less than about 1000 GPa, the rigidity is insufficient and the reinforcement becomes low, and if the elastic modulus exceeds about 2000 GPa, distortion occurs at a low temperature, and the elongation is less than about 1%. Again, distortion occurs at a low temperature, and if the elongation exceeds about 3%, the rigidity becomes insufficient and the reinforcement becomes low.

  The present inventors have completed the present invention on the basis of these findings, and further, by constituting the upper and lower two layers mainly from an organic compound and / or an organic polymer compound, it dissolves into an aqueous chemical conversion treatment solution. There is no fear and contamination of the chemical conversion solution can be prevented.

  In this way, the coated steel sheet can be easily automated, prevent contamination of the chemical conversion liquid in the chemical conversion treatment process without reducing the reinforcing effect, and does not cause distortion in the steel sheet even at low temperatures. Reinforcement material.

  The coated steel plate reinforcing material according to the invention of claim 2 has a lower layer portion containing rubber, a vulcanizing agent, a plasticizer, a foaming agent and a filler, and an upper layer portion comprising a thermosetting resin and a latent curing agent as a continuous phase. Alternatively, it has a sea-island microphase separation structure composed of a thermosetting elastomer and a latent crosslinking agent and rubber as a dispersed phase, and further contains a foaming agent and a fibrous filler, and the rubber is an upper layer portion and a lower layer portion. Each is contained in the range of about 5 wt% to about 10 wt%, and the fibrous filler is contained in the upper layer portion in the range of about 20 wt% to about 40 wt%.

  Here, as the thermosetting resin, epoxy resin, phenol resin, urea resin, melamine resin, unsaturated polyester resin, alkyd resin, urethane resin, or the like can be used. In addition, the “latent type curing agent” exhibits an action as a curing agent by heating, and functions to promote curing of the thermosetting resin. For example, latent type dicyandiamide can be used. Furthermore, a polybutadiene resin or the like can be used as the thermosetting elastomer. The “latent type cross-linking agent” indicates an action as a cross-linking agent by heating, and functions to promote curing of the thermosetting elastomer.

  As the rubber, butadiene-latex (BR) rubber, styrene-butadiene-latex (SBR) rubber having a styrene content of about 35% by weight or less, acrylonitrile-butadiene-latex (NBR) rubber, and the like can be used.

  Further, as the fibrous filler, calcium metasilicate fiber, calcium silicate fiber, whisker-like calcium carbonate fiber, potassium titanate fiber, aramid fiber, novoloid fiber, alumina-silica fiber, alumina fiber, silica fiber, etc. are used. be able to.

  As a result of accumulating earnest experimental research by the present inventors, it was found that the distortion resistance of the steel sheet reinforced coating obtained by applying the coating type steel sheet reinforcing material by mixing rubber in the lower layer part is greatly improved, When the amount of rubber mixed in the lower layer is less than about 5% by weight, the strain resistance at low temperature is lowered, and when it exceeds about 10% by weight, the rigidity is lowered and the steel sheet is insufficiently reinforced. did.

  Further, the upper layer portion is dispersed in a specific amount uniformly in a thermosetting resin and a latent curing agent or a thermosetting elastomer and a latent crosslinking agent which are continuous phases (sea) with rubber as a dispersed phase (island). It has been found that the rigidity of the steel sheet reinforced coating obtained by using a sea-island structure and further incorporating a fibrous filler is greatly improved.

  Here, if the amount of the rubber mixed in the upper layer is less than about 5% by weight, the strain resistance at low temperature is lowered, and if it exceeds about 10% by weight, the rigidity is lowered and the steel sheet is insufficiently reinforcing. It has been found that the rigidity is insufficient when the amount of the fibrous filler mixed in the upper layer is less than about 20% by weight, and the strain resistance at low temperatures is lowered when the amount exceeds about 40% by weight. The present inventors have completed the present invention based on these findings.

  In this way, the coated steel sheet can be easily automated, prevent contamination of the chemical conversion liquid in the chemical conversion treatment process without reducing the reinforcing effect, and does not cause distortion in the steel sheet even at low temperatures. Reinforcement material.

  The coated steel plate reinforcing material according to the invention of claim 3 is an anti-vibration rubber whose lower layer rubber is styrene-butadiene-latex (SBR) rubber.

  As described above, the coated steel plate reinforcing material is composed of upper and lower two layers, and the upper layer portion is made thicker than the lower layer portion so that the lower layer portion has flexibility (within a temperature range of -30 ° C to 20 ° C). In which the elastic modulus is 0.5 MPa or less and the elongation is in the range of about 100% to about 200%), and the upper layer portion is rigid (in the temperature range of −30 ° C. to 20 ° C., the elastic modulus is about 1000 GPa to By being within the range of about 2000 GPa and the elongation within the range of about 1% to about 3%, it is possible to achieve both low-temperature strain resistance and reinforcement (rigidity).

  As a result of further earnest experimental research, the present inventors have made the rubber in the lower layer a vibration-proof rubber including styrene-butadiene-latex (SBR) rubber, acrylic rubber, and polyethylene rubber (EPDM). The present inventors have found that a superior vibration damping property (vibration absorbing effect) can be obtained, and have completed the present invention based on this finding. The reason for this is that heavy and large atomic groups (for example, styrene group in the case of SBR rubber) constituting the side chain of the vibration-proof rubber generate internal friction heat by vibration applied from the outside, and heat the vibration energy. This is thought to be because of its excellent vibration damping function that converts energy.

  In this way, the construction can be easily automated, the contamination of the chemical conversion liquid in the chemical conversion treatment process can be prevented without deteriorating the reinforcing effect, and the steel sheet is not distorted even at low temperatures. In addition, the coated steel sheet reinforcing material is superior in vibration damping properties.

  The coated steel sheet reinforcing material according to the invention of claim 4 is such that the thickness of the upper layer portion is equal to or greater than the thickness of the lower layer portion, the lower layer portion has a thickness of about 0.5 mm to about 3.0 mm, and the upper layer portion is about It is applied to a thickness of 1.5 mm to about 4.0 mm.

  Assuming that the thickness of the upper layer portion is equal to or greater than the thickness of the lower layer portion, if the thickness of the lower layer portion is less than about 0.5 mm, the strain resistance decreases, and conversely, the thickness of the lower layer portion is about 3 mm. If the thickness exceeds 0.0 mm, the weight of the coated steel plate reinforcement as a whole increases, which is against the request for weight reduction of the vehicle body panel and the like. Therefore, the lower layer portion is applied to a thickness of about 0.5 mm to about 3.0 mm, and the upper layer portion is applied to a thickness of about 1.5 mm to about 4.0 mm. In addition, by limiting the thickness within such a range, it is possible to minimize the amount of application-type steel plate reinforcing material used, leading to cost reduction.

  In this way, the coated steel sheet can be easily automated, prevent contamination of the chemical conversion liquid in the chemical conversion treatment process without reducing the reinforcing effect, and does not cause distortion in the steel sheet even at low temperatures. Reinforcement material.

  In the coated steel plate reinforcing material according to the fifth aspect of the present invention, the fibrous filler has a diameter of about 5 μm to about 15 μm and a length of about 50 μm to about 200 μm.

  As a result of further earnest experiment research conducted by the present inventors, the fiber filler mixed in the upper layer portion has a diameter of about 5 μm to about 15 μm and a length of about 50 μm to about 200 μm. The present inventors have found that strain resistance and reinforcement (bending rigidity) can be obtained, and have completed the present invention based on this finding.

  In this way, the coated steel sheet can be easily automated, prevent contamination of the chemical conversion liquid in the chemical conversion treatment process without reducing the reinforcing effect, and does not cause distortion in the steel sheet even at low temperatures. Reinforcement material.

  Hereinafter, a coated steel sheet reinforcing material according to an embodiment of the present invention will be described with reference to the drawings.

Embodiment 1
First, the structure of the coated steel plate reinforcing material according to the first embodiment of the present invention will be described with reference to the cross-sectional view of FIG. FIG. 1 is a partially enlarged cross-sectional view showing the structure of a coated steel sheet reinforcing material according to Embodiment 1 of the present invention. As shown in FIG. 1, the coated steel plate reinforcing material 1 according to the first embodiment has a two-layer structure of an upper layer portion 2 and a lower layer portion 3, and the upper layer portion 2 has excellent rigidity and mainly reinforces the steel plate F. The lower layer 3 is excellent in flexibility and adhesiveness, and mainly serves as an adhesion / buffer layer for bonding the steel plate F and the upper layer 2 and preventing distortion. The upper layer portion 2 contains a fibrous filler 4 that reinforces rigidity and absorbs strain, and the upper layer portion 2 and the lower layer portion 3 contain a foaming agent 5 for absorbing strain.

  Next, the mixing | blending of the coating type steel plate reinforcement 1 concerning this Embodiment 1 is demonstrated. In the lower layer 3, butadiene-latex (BR) rubber (rubber A) or 23 wt% styrene-butadiene-latex (SBR) rubber (rubber B) as rubber, phthalate ester as plasticizer, and carbonic acid as filler Calcium was added as an additive to vulcanizing agent, foaming agent, acrylic powder, bis A type epoxy resin, and the like.

  The upper layer 2 is filled with bis-A type epoxy resin as a thermosetting resin as a continuous phase, latent dicyandiamide as a curing agent, acrylonitrile-butadiene-latex (NBR) rubber as a rubber as a dispersed phase, filler As an additive, fibrous calcium metasilicate obtained by pulverizing calcium carbonate and wollastonite, an organic foaming agent as an additive, and carbon powder as a pigment were blended.

What changed these compounding ratios were manufactured to Example 1-Example 4, and also Comparative Example 1-Comparative Example 4 was manufactured for the comparison, and the characteristic test was done. Table 1 summarizes each formulation of Examples 1 to 4 and Comparative Examples 1 to 4.

  As shown in Table 1, Example 1 and Example 4 contain 6% by weight of rubber B having a styrene content of 35% by weight or less in the lower layer, and Examples 2, 3 and 3 contain 6% by weight of rubber A. Both satisfy the conditions of the invention according to claim 2. On the other hand, Comparative Example 1 and Comparative Example 2 contain 6% by weight of 46% by weight of styrene-butadiene-latex (SBR) rubber (rubber C) exceeding 35% by weight of styrene.

  Moreover, Example 1 thru | or Example 4 and the comparative example 1 mix | blend the fibrous filler 33weight%-35weight% in the upper layer, and satisfy | fill the conditions of the invention concerning Claim 2, Comparative Example 3 contains 43.5% by weight and 15% by weight of fibrous filler, and Comparative Example 2 does not contain a foaming agent, both satisfying the conditions of the invention according to claim 2. Absent.

  In addition, since all the mixing | blendings shown in Table 1 have an organic compound and an organic high molecular compound as a main component, in the chemical conversion treatment process, the contamination of the aqueous chemical conversion treatment liquid can be prevented. Further, since inexpensive calcium carbonate and wollastonite (calcium metasilicate) are used as fillers, the cost is low.

  Next, a test method for the characteristic test in the first embodiment will be described with reference to FIGS. FIG. 2 is a schematic diagram showing a test method of a bending stiffness test according to the first embodiment of the present invention. FIG. 3A is a schematic diagram showing a case where no distortion occurs in the strain resistance test according to the first embodiment of the present invention, and FIG. 3B shows an example when distortion occurs in the strain resistance test. It is a schematic diagram.

[Reinforcing (bending rigidity)]
The coated steel plate reinforcing material 1 is applied to one side of a 25 mm × 200 mm × 0.8 mm thick oil surface steel plate F so as to have a size of 25 mm × 150 mm (upper layer thickness 2 mm, lower layer thickness 1 mm), 180 ° C. The test piece was produced by holding for 20 minutes and thermosetting, and, as shown in FIG. 2, a wedge K (rounded tip) was formed from the steel plate F side in the center of the two-point support of the support points S1 and S2. R5) was pressed to perform three-point bending, bending to 5 mm, and measuring the rigidity (strength) at the time of 1 mm displacement.

  The test conditions were a distance between the support points S1 and S2 of 100 mm and a compression speed of 1 mm / min. The bending stiffness of a 0.8 mm thick steel plate alone under the same test conditions was 10 N, the bending stiffness of a 1.0 mm thick steel plate alone was 20 N, and a case where the bending stiffness was 20 N or more was determined to be acceptable.

[Distortion]
In the distortion test, the coated steel plate reinforcing material 1 was applied to one side of a 200 mm × 300 mm × 0.5 mm thick oil-coated steel plate F in a size of 50 mm × 150 mm, held at 180 ° C. for 20 minutes and thermally cured. A black glossy paint was applied to the opposite surface to a thickness of about 20 μm and dried at 140 ° C. for 30 minutes as a test piece, and visually observed and evaluated for the occurrence of distortion at 20 ° C. and −30 ° C. As shown in 3 (a), the case where no distortion was observed was evaluated as ◯, and as shown in FIG. 3 (b), the case where distortion was recognized was evaluated as x.

  The test results of the above reinforcing properties (bending rigidity) and distortion properties are summarized in the lower part of Table 1 for Examples 1 to 4 and Comparative Examples 1 to 4.

  As shown in Table 1, Example 1 uses, as a lower layer, 6% by weight of rubber B satisfying the conditions of the present invention as a rubber in a lower layer, satisfying the conditions of the present invention, and has an elastic modulus of 0.4 MPa and elongation. The rate is 100% and both satisfy the conditions of the present invention. Further, since 33 wt% of a filler made of wollastonite (a fibrous filler made of calcium metasilicate) is used as the upper layer, the elastic modulus is 1000 GPa and the elongation is 3%. It meets the conditions of the invention.

  As a result, with regard to reinforcement (bending rigidity), the bending rigidity is as large as 30N and excellent in rigidity, and the distortion is evaluated as ○ with no distortion observed at 20 ° C or -30 ° C. It is a low-cost coating type steel plate reinforcing material that can be automated, can prevent contamination of the chemical conversion treatment solution in the chemical conversion treatment step without reducing the reinforcing effect, and does not cause distortion in the steel plate even at low temperatures.

  Further, Example 2 uses 6% by weight of butadiene-latex rubber A satisfying the conditions of the present invention as a rubber in the lower layer, satisfying the conditions of the present invention, and has an elastic modulus of 0.3 MPa and an elongation of 200%. Also satisfies the conditions of the present invention. Further, since 33 wt% of the filler composed of substantially wollastonite satisfying the conditions of the present invention is used for the upper layer, the elastic modulus is 1500 GPa and the elongation is 1.5%, both of which satisfy the conditions of the present invention.

  As a result, with regard to reinforcement (bending rigidity), the bending rigidity is as large as 30N and excellent in rigidity, and the distortion is evaluated as ○ with no distortion observed at 20 ° C or -30 ° C. It is a low-cost coating type steel plate reinforcing material that can be automated, can prevent contamination of the chemical conversion treatment solution in the chemical conversion treatment step without reducing the reinforcing effect, and does not cause distortion in the steel plate even at low temperatures.

  Further, Example 3 uses 6% by weight of butadiene-latex rubber A satisfying the conditions of the present invention as a rubber in the lower layer, satisfying the conditions of the present invention, and has an elastic modulus of 0.3 MPa and an elongation of 200%. Also satisfies the conditions of the present invention. Further, since 35% by weight of the filler composed of almost wollastonite satisfying the conditions of the present invention is used for the upper layer, the elastic modulus is 2000 GPa and the elongation is 1%, both satisfying the conditions of the present invention.

  As a result, with regard to reinforcement (bending rigidity), the bending rigidity is as large as 40 N and excellent in rigidity, and the distortion is evaluated as ○ with no distortion observed at 20 ° C. or −30 ° C. It is a low-cost coating type steel plate reinforcing material that can be automated, can prevent contamination of the chemical conversion treatment solution in the chemical conversion treatment step without reducing the reinforcing effect, and does not cause distortion in the steel plate even at low temperatures.

  In Example 4, 6% by weight of the rubber B satisfying the conditions of the present invention using 6% by weight satisfying the conditions of the present invention was used as the lower layer of rubber. The elastic modulus was 0.4 MPa and the elongation was 100%. Also satisfies the conditions of the present invention. Further, since 35% by weight of the filler composed of almost wollastonite satisfying the conditions of the present invention is used for the upper layer, the elastic modulus is 2000 GPa and the elongation is 1%, both satisfying the conditions of the present invention.

  As a result, with regard to reinforcement (bending rigidity), the bending rigidity is as large as 45N and excellent in rigidity, and the distortion is evaluated as ○ with no distortion observed at 20 ° C. or −30 ° C. It is a low-cost coating type steel plate reinforcing material that can be automated, can prevent contamination of the chemical conversion treatment solution in the chemical conversion treatment step without reducing the reinforcing effect, and does not cause distortion in the steel plate even at low temperatures.

  On the other hand, Comparative Example 1 uses a rubber C of 46% styrene that does not satisfy the conditions of the present invention as a rubber in the lower layer, and the elastic modulus is 0.8 MPa and the elongation is 50%. Does not meet. As a result, the flexibility of the lower layer portion is insufficient, and the upper layer uses 36% by weight of a filler made of wollastonite that satisfies the conditions of the present invention. The elastic modulus is 1000 GPa and the elongation is 1%. In spite of satisfying the conditions of the present invention, the reinforcement (bending rigidity) has a bending rigidity of 35 N and excellent rigidity, but distortion is recognized at −30 ° C. Insufficient strain resistance.

  Further, Comparative Example 2 also uses a rubber C of 46% styrene that does not satisfy the conditions of the present invention as a rubber for the lower layer, and the elastic modulus is 0.8 MPa and the elongation is 50%, both satisfying the conditions of the present invention. Absent. Furthermore, 43.5% by weight of a filler composed of almost wollastonite that does not satisfy the conditions of the present invention is used for the upper layer, the elastic modulus is 3000 GPa, the elongation is 1.5%, and the elastic modulus is too large. It does not meet the conditions of the invention. As a result, both the lower layer portion and the upper layer portion have insufficient flexibility, and the bending rigidity is as large as 45 N and excellent in rigidity, but distortion is recognized at 20 ° C. and −30 ° C., and the evaluation is ×. It can be seen that the strain resistance is insufficient.

  Comparative Example 3 uses 6% by weight of the butadiene-latex rubber A satisfying the conditions of the present invention as a rubber in the lower layer, satisfying the conditions of the present invention, and has an elastic modulus of 0.3 MPa and an elongation of 200%. Although the conditions of the present invention are satisfied, the upper layer uses only 15% by weight of a filler made of wollastonite that does not satisfy the conditions of the present invention, and has an elastic modulus of 500 GPa and an elongation of 3%. The rate is too small to meet the conditions of the present invention. As a result, the rigidity of the upper layer portion becomes insufficient, and no distortion is observed at 20 ° C. or −30 ° C., which is evaluated as “Good”. The strain resistance is excellent, but the bending rigidity is as small as 15 N × It can be seen that the reinforcing property is insufficient.

  Further, Comparative Example 4 was formulated so as to substantially reproduce Example 1 of Patent Document 2 above, with the lower layer centered on the epoxy-urethane resin material and the upper layer centered on the epoxy resin material. However, the elastic modulus of the lower layer is 50 MPa, the elongation is 10%, the elastic modulus is too large, the elongation is too small to satisfy the conditions of the present invention, the elastic modulus of the upper layer is 3000 GPa, and the elongation is At 1%, the elastic modulus is too large to satisfy the conditions of the present invention. As a result, both the lower layer portion and the upper layer portion have insufficient flexibility, and the flexural rigidity is as large as 50 N and excellent in rigidity. However, distortion is recognized at −30 ° C., and the evaluation is ×. The strain was evaluated as Δ, and it was found that the strain resistance was insufficient.

  Thus, the coating-type steel plate reinforcing material according to the blends of Comparative Examples 1 to 4 has a point that none of the conditions of the present invention is satisfied, and as a result, any of the reinforcing property (bending rigidity) and the strain resistance It is lacking in practicality. On the other hand, the coating-type steel plate reinforcing materials according to the formulations of Examples 1 to 4 all satisfy all the conditions of the present invention, and as a result, any of reinforcement (bending rigidity) and distortion resistance Is excellent, can easily automate the construction, can prevent contamination of the chemical conversion liquid in the chemical conversion treatment process without reducing the reinforcing effect, and does not cause distortion in the steel plate even at low temperatures Low cost coated steel plate reinforcements have been obtained.

Embodiment 2
Next, the coated steel plate reinforcing material according to the second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a diagram showing the measurement results of the loss factor of the coated steel sheet reinforcing material according to the second embodiment of the present invention in comparison with the other three comparative examples.

  The coated steel plate reinforcing material according to the second embodiment is also composed of a two-layer structure of an upper layer portion 2 and a lower layer portion 3 in the same manner as the coated steel plate reinforcing material 1 according to the first embodiment shown in FIG. The portion 2 is excellent in rigidity and mainly serves as a constraining layer for reinforcing the steel plate F, and the lower layer portion 3 is excellent in flexibility and adhesion, and mainly adheres the steel plate F and the upper layer portion 2 and prevents distortion. It plays a role as a buffer layer. The upper layer portion 2 contains a fibrous filler 4 that reinforces rigidity and absorbs strain, and the upper layer portion 2 and the lower layer portion 3 contain a foaming agent 5 for absorbing strain.

Next, the composition of the coated steel plate reinforcing material according to the second embodiment (Example 5) will be described. The lower layer is made of rubber, 33.5% styrene-butadiene-latex (SBR) rubber partially crosslinked type (rubber D) and 3% fully crosslinked type (rubber E) as vibration-proof rubber. 1% by weight of rubber crosslinking agent / crosslinking accelerator, 43% by weight of plasticizer / foaming agent / acrylic powder / bis-A type epoxy resin as additives, and 50% by weight of calcium carbonate as filler. . Table 2 shows the composition of this lower layer part.

In the upper layer, 38% by weight of a bis-A type epoxy resin as a thermosetting resin as a continuous phase, 13% by weight of an epoxy diluent, 4% by weight of latent dicyandiamide and a curing accelerator as a curing agent are dispersed. 5% by weight of acrylonitrile-butadiene-latex (NBR) rubber partially crosslinked type (rubber F) as a rubber as a phase, 37% by weight of fibrous calcium metasilicate pulverized with calcium carbonate and wollastonite as a filler, additive 2 wt% of organic foaming agent and 1 wt% of carbon powder as pigment. Table 3 shows the composition of this upper layer part.

The coated steel plate reinforcing material composed of these compounds was applied to the steel plate so that the upper layer portion had a thickness of 2 mm and the lower layer portion had a thickness of 1 mm, and a vibration damping test and a strain test were performed. For comparison, vibration damping tests and strain tests using the materials of Comparative Example 5, Comparative Example 6, and Comparative Example 7 were also performed. Table 4 summarizes the materials constituting Example 5 and Comparative Example 5, Comparative Example 6, and Comparative Example 7 according to the second embodiment.

  As shown in Table 4, each of Comparative Example 5, Comparative Example 6, and Comparative Example 7 is composed of two layers, an upper layer and a lower layer, as in Example 5. In Comparative Example 5, Example 5 is used as the upper layer. The same material A was applied with a thickness of 2 mm, and the lower layer was applied with a thickness of 1 mm of polyvinyl chloride (PVC) as an adhesive. In Comparative Example 6, 0.2 mm thick glass cloth was used as the upper layer, and 2.5 mm thick butyl rubber (IIR) was used as the lower layer. Further, in Comparative Example 7, a prepreg sheet having a 0.1 mm-thick glass cloth as an upper layer and a 0.8 mm-thick epoxy resin as a main component was used as a lower layer.

  Next, the test method and the result of the performance test for these coated steel plate reinforcements will be described with reference to the lower part of Table 4 and FIG.

  First, the test method of the vibration damping test will be described. A test piece was prepared by applying each material to a width of 10 mm × 200 mm on one side of a steel plate having a width of 10 mm × length of 220 mm × thickness of 0.8 mm and drying at 180 ° C. for 20 minutes. The loss factor was measured by the cantilever method, and the loss factor at the secondary resonance point at each temperature (20 ° C., 40 ° C., 70 ° C.) was calculated by the half width method. As the loss factor is larger, there is a vibration damping effect, and vibration radiation sound can be suppressed.

  As a result, as shown in the lower part of Table 4 and FIG. 4, in the coated steel sheet reinforcing material of Example 5 according to the second embodiment, the loss coefficient at 20 ° C. is 0.12, and the loss coefficient at 40 ° C. It was found that the loss factor at 0.2 and 70 ° C. was 0.09, which was sufficiently large at any temperature and was excellent in vibration damping.

  On the other hand, in the material of Comparative Example 6, the loss coefficient at 20 ° C. is 0.13, the loss coefficient at 40 ° C. is 0.16, and the loss coefficient at 70 ° C. is 0.11, which is sufficient at any temperature. Although it was found to be large and excellent in vibration damping properties, in the material of Comparative Example 5, the loss factor at 20 ° C was 0.04, the loss factor at 40 ° C was 0.05, and the loss factor at 70 ° C was 0. 0.06, the loss factor at 20 ° C. was 0.03, the loss factor at 40 ° C. was 0.04, and the loss factor at 70 ° C. was 0.06, both of which were small, and the damping property Turned out to be inferior.

  Further, as shown in the lower part of Table 4, the resonance frequency at 20 ° C. (proportional to the tension stiffness) is 195 Hz in the coated steel sheet reinforcing material of Example 5 according to the second embodiment, and that of Comparative Example 5 It was found that the material was 190 Hz and the material of Comparative Example 7 was as high as 190 Hz and excellent in rigidity, but the material of Comparative Example 6 was as low as 96 Hz and was inferior in rigidity.

  Next, a test method for the strain test will be described. Each material was applied to one side of a steel plate with a width of 200 mm, a length of 300 mm, and a thickness of 0.5 mm, and each material was applied to a size of 50 mm × 150 mm, dried at 180 ° C. for 20 minutes, and then a black gloss paint was applied to the opposite side. A test piece was applied to a thickness of 20 μm and dried at 140 ° C. for 30 minutes. Then, at −30 ° C., distortion such as curvature of the steel sheet surface was visually observed.

  As a result, as shown in the lower part of Table 4, in the coated steel sheet reinforcing material of Example 5 according to the second embodiment and the material of Comparative Example 6, the black gloss paint was applied even at −30 ° C. No distortion was observed in the steel sheet. On the other hand, in the materials of Comparative Example 5 and Comparative Example 7, strain was observed on the steel sheet coated with the black gloss paint at −30 ° C., and it was found that the material was inferior in strain resistance.

  As described above, as shown in the lower part of Table 4, the coated steel sheet reinforcing material of Example 5 according to the second embodiment is excellent in all of vibration damping properties, rigidity, and strain resistance. The overall evaluation was ○. On the other hand, in the materials of Comparative Example 5, Comparative Example 6, and Comparative Example 7, a result that the vibration damping property, the rigidity, or the strain resistance is inferior is obtained. It became clear that it could not withstand practical use.

  In addition, the coating-type steel plate reinforcing material of Example 5 according to the second embodiment has an elastic modulus of 0.5 MPa or less in the temperature range of −30 ° C. to 20 ° C. after curing (drying). And the elongation is in the range of about 100% to about 200%, the upper layer is in the temperature range of −30 ° C. to 20 ° C., the elastic modulus is in the range of about 1000 GPa to about 2000 GPa, and the elongation is about 1%. The condition of the present invention is in the range of ˜about 3%.

  Thus, in the coating type steel plate reinforcing material of Example 5 according to the second embodiment, all of the conditions of the present invention are satisfied, and as a result, any of reinforcement (bending rigidity) and distortion resistance is obtained. It is also excellent, can be easily automated, can prevent contamination of the chemical conversion solution in the chemical conversion treatment process without reducing the reinforcing effect, and does not strain the steel plate even at low temperatures In addition, it is a low-cost coated steel plate reinforcing material that is more excellent in vibration damping properties.

  Furthermore, in the coated steel plate reinforcing material of Example 5 according to the second embodiment, since the SBR rubber is used for the lower layer portion, it has a certain degree of viscosity even before heating and drying. In addition, it does not scatter due to body washing showers, etc. in a paint factory. The same applies to the upper layer portion. Therefore, even when used as a coated steel plate reinforcement for automobile bodies, doors, etc., heat drying is performed simultaneously with the drying of the final body coating, but the automobile production process is shortened. However, it can withstand the pressure of the body wash shower, so it can be used without problems.

  About this point, it is the same also about the Example 1- Example 4 in the said Embodiment 1. FIG. Further, by using the coated steel plate reinforcing material of Example 5 according to the second embodiment on the door of the automobile, the door closing sound is low and the sound is comfortable and comfortable, and the vibration control as a speaker enclosure is achieved. By preventing unnecessary resonance due to the effect, an effect of improving the audio sound quality can be obtained, and this is the same for the first to fourth embodiments in the first embodiment.

  In the second embodiment, the case where styrene-butadiene-latex (SBR) rubber having 23.5% by weight of styrene is used as the vibration-proof rubber in the lower layer has been described. However, the vibration-proof rubber is limited to SBR rubber. Instead, other vibration-proof rubbers such as acrylic rubber and polyethylene rubber (EPDM) can be used.

  In each of the above embodiments, an example in which an epoxy resin is used as a thermosetting resin in the upper layer and the lower layer is described. However, the thermosetting resin is not limited to an epoxy resin, and a phenol resin, a urea resin, or a melamine resin. An unsaturated polyester resin, an alkyd resin, a urethane resin, or the like can be used.

  In each of the above embodiments, an example in which an epoxy resin of a thermosetting resin is used for the upper layer and the lower layer is described. However, a thermosetting elastomer such as a polybutadiene resin is used instead of the thermosetting resin. You can also.

  Further, in each of the above embodiments, wollastonite (wollastonite: calcium metasilicate) is used as a fibrous filler by pulverizing wollastonite (calcite: calcium metasilicate). For example, calcium silicate fibers, whisker-like calcium carbonate fibers, potassium titanate fibers, aramid fibers, novoloid fibers, alumina-silica fibers, alumina fibers, silica fibers, and the like can be used.

  Other compositions, components, blending amounts, materials, sizes, manufacturing methods, and the like of the coated steel plate reinforcing material are not limited to the above embodiments.

FIG. 1 is a partially enlarged cross-sectional view showing the structure of a coated steel sheet reinforcing material according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram showing a test method of a bending stiffness test according to the first embodiment of the present invention. FIG. 3A is a schematic diagram showing a case where no distortion occurs in the strain resistance test according to the first embodiment of the present invention, and FIG. 3B shows an example when distortion occurs in the strain resistance test. It is a schematic diagram. FIG. 4 is a diagram showing the measurement result of the loss count of the load other version reinforcing material compared with the other three comparative spirits according to the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coating type steel plate reinforcement material 2 Upper layer part 3 Lower layer part 4 Fibrous filler 5 Foaming agent F Steel plate

Claims (5)

A coated steel plate reinforcing material comprising a lower layer applied to the steel sheet surface and an upper layer applied on the lower layer,
The lower layer portion and the upper layer portion contain an organic compound and / or an organic polymer compound as a main component,
The upper layer part is applied to a thickness equal to or greater than the thickness of the lower layer part,
The lower layer portion has an elastic modulus of 0.5 MPa or less and an elongation of about 100% to about 200% within a temperature range of -30 ° C to 20 ° C after drying,
The upper layer portion has a modulus of elasticity of about 1000 GPa to about 2000 GPa and an elongation of about 1% to about 3% within a temperature range of -30 ° C to 20 ° C after drying. Application type steel plate reinforcement. The lower layer contains rubber, vulcanizing agent, plasticizer, foaming agent and filler,
The upper layer portion has a sea-island type microphase separation structure composed of a thermosetting resin and a latent curing agent or a thermosetting elastomer and a latent crosslinking agent as a continuous phase, and a rubber as a dispersed phase, Contains a foaming agent and a fibrous filler,
The rubber is contained in the upper layer part and the lower layer part in a range of about 5% by weight to about 10% by weight, respectively.
2. The coated steel plate reinforcing material according to claim 1, wherein the fibrous filler is contained in the upper layer portion in a range of about 20 wt% to about 40 wt%.   The coated steel sheet reinforcing material according to claim 2, wherein the rubber of the lower layer portion is a vibration-proof rubber including styrene-butadiene-latex (SBR) rubber.   The lower layer portion is applied to a thickness of about 0.5 mm to about 3.0 mm, and the upper layer portion is applied to a thickness of about 1.5 mm to about 4.0 mm. The coated steel plate reinforcing material according to any one of the above.   5. The coated steel plate reinforcement according to claim 2, wherein the fibrous filler has a diameter of about 5 μm to about 15 μm and a length of about 50 μm to about 200 μm. Wood.

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