JPH0649975A - Waterproof coating method of structure - Google Patents

Abstract

PURPOSE:To make good follow-up efficiency to the foundation and to promote impact resistance by forming two kinds and bilayer of waterproof coating layers of a polyurethane formable hardening paint film material and a hardening composition on the foundation. CONSTITUTION:A polyurethane formable hardening paint film material (I) conforming to JISA 6021 is applied to the foundation, and after the solidification, a polyurethane formable hardening composition (II) of at least Shore D 60 hardness and at least 20% of ductility is applied to solidify. The hardening paint film material (I) is formed into a cold hardening paint film material of Shore A hardness 20-80. The hardening composition (II) is a cold hardening composition and has polyol-type formaldehyde resin and polyisocyanate for the main components. In addition, the thickness of a hardening paint film of the hardening paint film material (I) and the hardening paint film of the hardening composition (II) is more than 1mm respectively, and overall thickness of a laminated paint film on the foundation is more than 3mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention applies surface reinforcement to a conventional waterproof covering material, and finally, not only has good followability to a substrate but also excellent impact resistance. The present invention relates to a waterproof coating method for a structure that obtains a waterproof floor applicable to passage.

[0002]

2. Description of the Related Art It is well known how to harden and coat a substrate with a curable waterproof material to improve the waterproof property. For this waterproof material, as specified in JIS A6021, urethane rubber type and acrylic rubber type are used. , Chloroprene rubber type, rubber asphalt type.

Among these waterproof materials, the urethane base waterproof material is excellent in that it has excellent crack followability of the base substrate and can be easily applied to the surface having a complicated shape as compared with the above-mentioned waterproof material. Is most often used.

However, at present, when the application is further expanded to obtain a waterproof floor which can be applied to the pavement floor and the passage of vehicles on the roof of a structure, etc., the strength of the polyurethane waterproof coating alone is remarkably insufficient. It has the drawback of losing its waterproofing effect immediately.

Therefore, in order to improve this drawback, curing of a curable composition such as an epoxy resin, an unsaturated polyester resin, a vinyl ester resin, etc., which can be applied as a reinforcing layer on the polyurethane waterproof material coating film to provide a coating layer by field construction. It is used for its purpose by forming a layer of a hard material.

[0006]

However, the reinforced layer obtained from the curable composition used for providing on the polyurethane waterproof material coating film has a small elongation and a low impact resistance, and has a falling object or a heavy object. There was a serious drawback that the reinforcing layer was easily cracked by the impact of.

Further, when the above-mentioned curable composition for obtaining the reinforcing layer is examined, it has many defects in details. Epoxy resin is inferior in curability at low temperature, and problems are likely to occur in winter construction. Unsaturated polyester resin and vinyl ester resin have large curing shrinkage peculiar to radical polymerization, so it is necessary to use glass fiber and glass mat together. In the field work, this glass fiber and mat should be held in the body. Is generally shunned.
Even if it is strengthened in this way, there is a drawback that it causes warping.
When unsaturated polyester resin or vinyl ester resin is applied onto the urethane coating material even during the construction process, radicals are generated due to the adverse effect of the lead-based metal catalyst of the urethane formation accelerator contained in the urethane coating material. It is considered that the reaction is hindered, and the curing failure of the unsaturated polyester resin and vinyl ester resin may occur.

From the viewpoint of safety and hygiene, epoxy resin has a serious problem of amine odor of curing agent and rash. Unsaturated polyester resin and vinyl ester resin have a risk of fire explosiveness of peroxide which is a radical catalyst and styrene monomer. Odor becomes a problem in construction.

It is an object of the present invention to provide a waterproof structure coating method for a structure, which has good followability to a substrate, and can obtain a structure in which the reinforcing layer is not easily broken by the impact of a falling object or a heavy object.

[0010]

Means for Solving the Problems That is, according to the present invention, a polyurethane-forming curable coating material (I) conforming to JISA6021 is applied on a substrate, and after the coating material is cured, a Shore D hardness is applied. The present invention provides a waterproof coating method for a structure, which comprises applying a curable composition (II) capable of forming a polyurethane having an elongation of 60 or more and 20% or more and curing the composition.

(Structure) The laminated waterproof layer on the substrate obtained by the construction method of the present invention is a polyurethane coating film conforming to JIS A6021, a Shore D hardness of 60 or more, and an elongation of 20%.
It is characterized by being laminated with the above polyurethane, and the second waterproof layer is a polyurethane having a Shore D hardness of 60 or more and an elongation of 20% or more.

The highly flexible polyurethane coating layer formed on the substrate has a urethane rubber type defined in JIS A6021 and a waterproof material performance corresponding to Category 1 or Category 2. The polyurethane-forming curable coating material (I) capable of exhibiting such performance is easily prepared, for example, by adding a filler or the like to a curable composition containing a known polyisocyanate, a polyol or a crosslinking agent as a main raw material. Is obtained.

On the other hand, Shore D hardness is 60 or more and elongation is 2
0% or more of a curable composition capable of forming polyurethane (I
As I), for example, a polyol (A) containing as an essential component a polyol-type xylene formaldehyde resin having two or more hydroxyl groups and a hydroxyl equivalent of 50 or more, and a polyisocyanate compound having two or more free isocyanate groups in the molecule. The thing which made (B) an essential component is mentioned.

The polyol (A) is a polyol type xylene formaldehyde resin (A-1) alone or a resin (A
-1) and a mixture of other polyol (A-2).

Examples of the polyol type xylene formaldehyde resin (A-1) used in the present invention include those having the structures shown below.

[0016]

[Chemical 1]

[0017]

[Chemical 2]

[0018]

[Chemical 3]

The polyol type xylene formaldehyde resin (A-1) is obtained by reacting metaxylene and formalin in the presence of a strong acid catalyst. Resin (A-1)
For example, meta-xylene is a methylene bond, an acetal bond or an ether bond (R in the above general formula
2) to be linked by a molecular end (R1, R in the above general formula
3) having a multi-molecular structure containing a xylene nucleus and a methylol group or a methoxymethyl group, or a phenol group, a carboxylic acid, an amine, which has the above-mentioned highly reactive bonding group or terminal group in the xylene resin. There are one or a compound having active hydrogen such as alcohol or aromatic hydrocarbon, or a compound modified by introducing a complex as a third component (the above general examples R1 and R3).

The resin (A-1) preferably has 10 or less nuclides, has 2 or more hydroxyl groups, and has a hydroxyl equivalent of 50 or more, more preferably 2 to 4 nuclides.
Examples of the third component used for modifying the xylene resin include trimethylolpropane, hexanediol, hexanetriol, polyoxyalkylene ether polyol, dipropylene glycol, ethylene glycol, diethylene glycol, glycerin, polybutadiene polyol, neopentylglycol. , Polychloroprene polyol, polycaprolactone polyol, phenol, alkyl alcohol, triethanolamine, pentaerythritol and the like, but trimethylolpropane is preferable.

Finally, the polyol type xylene resin (A-
As the number of functional groups in 1) increases, the foaming phenomenon of the cured product under high temperature and high humidity decreases, but on the contrary, the reaction rate tends to increase. There is a problem that the usage time cannot be taken sufficiently. The preferred number of functional groups is 2 to 4.

As the polyol (A-2) other than the xylene resin (A-1) in the polyol (A) component, any conventionally known one can be used. Examples of the polyol (A-2) include long chain polyoxyalkylene ether polyols, short chain polyols such as ethylene glycol and propylene glycol, castor oil,
Examples thereof include soybean oil-modified polyol, castor oil-modified polyol, and the like, and polyoxyalkylene ether polyol and castor oil are preferable. As the polyoxyalkylene ether polyol, the hydroxyl equivalent is 100 to 1000.
Are preferred.

The smaller the number of cores of the polyol-type xylene resin (A-1), the easier the handling because the viscosity of the polyol-type xylene resin (A-1) is low and it is difficult to solidify.
Mixing with the polyol (A-2) other than 1) becomes easy, and the viscosity of the obtained mixed polyol becomes low, and workability during construction becomes good.

When the amount of the xylene resin (A-1) in the polyol (A) component is small, the hardness is low, but the flexibility is improved and the pot life is extended. Therefore, the amount of the polyol-type xylene resin (A-1) is preferably 50 to 80 equivalent% when the total amount of the polyol (A) component is 100 equivalents.

Examples of the polyisocyanate compound (B) having two or more free isocyanate groups used in the present invention include 2.4 and 2.6-toluene diisocyanate (TDI) and diphenylmethane 4,4'-. Diisocyanate (Pure or Monomeric MDI),
Polymeric MDI, crude MDI, hexamethylene diisocyanate (HDI), trans-cyclohexa-1.4-diisocyanate (CHDI), isophorone diisocyanate (IPDI), m-xylene diisocyanate (XDI), naphthalene diisocyanate (N
DI), p-phenylene diisocyanate (PPD
I) 4.4'-diphenylmethane triisocyanate (Desmodur RI), NCO-terminated prepolymers (prepolymerization) of these isocyanate compounds and active hydrogen-containing compounds, and modified polyisocyanates liquefied by carbodiimidization, etc. It is a polyisocyanate compound.

The polyisocyanate compound (B) is preferably crude MDI [MR-100, MR-
200, MR-400 (manufactured by Nippon Polyurethane)] or modified liquid MDI [Isonate 143L (manufactured by Kasei Upjohn)].

In the present invention, a foaming inhibitor is used in combination in order to remove water which causes a foaming phenomenon on the coated surface or absorb carbon dioxide generated by reacting with this water to finish the surface of the hard floor material well. May be. Examples of foaming inhibitors used at this time include slaked lime and magnesium hydroxide [Kisuma 5
(Manufactured by Kyowa Chemical Industry Co., Ltd.)], synthetic adsorbent [Kyoward 20
00 (manufactured by Kyowa Chemical Industry Co., Ltd.)], orthoformic acid methyl ester [OFM (manufactured by Nihonho Chemical)], ethyl orthoformic acid ester [OFE (manufactured by Nihonbo Chemical)], anhydrous gypsum, calcium chloride (manufactured by Tokuyama Soda), synthetic hydro Talside [Alkamizer (manufactured by Kyowa Chemical Industry)] and the like can be mentioned. The foaming inhibitors are preferably synthetic zeolite and synthetic hydrotalcide.

In preparing the coating material (I) and the curable composition (II) used in the present invention, if necessary, a foaming inhibitor, a filler, a plasticizer, and
Bone agents, pigments, catalysts, weather resistance stabilizers, solvents and the like can be kneaded together.

Usually, the coating material (I) and the curable composition (I
I) is a method in which a polyol component and a polyisocyanate component are mixed at a predetermined mixing ratio at room temperature, and trowel coating or brush coating is performed within a working time to form a base or a flexible urethane coating layer. Apply and cure.

The method of applying the coating material (I) and the curable composition (II) to the construct of the present invention can be achieved by the following method. First of all, the coating material (I) is applied and cured on the substrate to provide a highly flexible JIS.
A urethane waterproof layer corresponding to the urethane rubber type 1 or 2 specified in A6021 is provided. At this time, if necessary, in order to improve the adhesion to the substrate and to avoid the influence of the substrate surface, the substrate surface may be pretreated, for example, by applying a primer. As the coating material (I), as described above, a material which complies with JISA6021 and forms a polyurethane having a Shore A hardness of 30 to 80, particularly preferably 35 to 70 is used. It

A coating material forming a polyurethane having a hardness of 20 or less in Shore A hardness generally causes the cured coating to be extremely sticky, leaving a problem in the work of the next step. On the other hand, a coating material that forms polyurethane having a hardness of 80 or more in Shore A hardness has a low elongation of the coating and an insufficient buffering effect against cracks and movements generated on the substrate, and thus the waterproofing of the present invention. It is not suitable for the coating method.

The thickness of the polyurethane coating layer having the performance specified in JIS A6021 is 1 mm or more because a waterproof function is required, and two or more coatings are required to obtain a film thickness as uniform as possible. It is preferable to form a coating film by operation.

A polyurethane coating layer having a Shore D hardness of 60 or more and an elongation of 30% or more is obtained by coating and curing the curable composition (II) on the polyurethane coating layer having the performance specified in JIS A6021 of the present invention. The curable composition (II) is usually applied so that the cured coating film has a thickness of 1 mm or more.

It is preferable that the total thickness of the laminated polyurethane layer in which the flexible polyurethane layer and the high-hardness polyurethane layer are provided in this order on the substrate is 3 mm or more. Further, a surface treatment such as a protective coating or a non-slip process can be performed on the waterproof coating surface finished by the present invention. INDUSTRIAL APPLICABILITY The construction method of the present invention can be applied to a wide range of applications from simple rooftop waterproofing to a parking lot having a waterproof function, a playground, a garden for greening, and the like.

[0035]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples. The number of parts in the examples is based on weight. Examples 1 to 3 A urethane solution primer was applied onto a concrete mortar substrate, dried, and then a coating material was applied onto the substrate, and curing was repeated twice, and JIS A6021 shown in Table 1 having a thickness of 3 mm was used.
Three types of flexible polyurethane layers having the performance specified in 1. were provided.

[0036]

[Table 1] Then, a curable composition prepared by the following operation was applied onto each of these three types of flexible polyurethane layers to give a thickness of 1.
It was applied and cured so as to have a thickness of 5 mm to form a laminated polyurethane waterproof coating layer having a total thickness of 4.5 mm.

-Preparation of Curable Composition- 266 parts of a polyol type xylene formaldehyde resin Nikanol K-140 (see the following formula, hydroxyl value 289, manufactured by Mitsubishi Gas Chemical) having an average molecular weight of 776 and an average molecular weight of 10
No. 00 polyether triol 300 parts [Hyprox TG-1000 (manufactured by Dainippon Ink and Chemicals Incorporated), synthetic zeolite 70 parts [Zeoramu F-9 (manufactured by Tosoh Corporation)], calcium carbonate 180 parts [NS-200 (Nitto Koka Kogyo) Manufactured)], pigment 70 parts, dioctyl phthalate (DOP)
120 parts were uniformly mixed while vacuum degassing using a planetary mixer, and this was used as the polyol component (A). As the polyisocyanate compound (B), crude MD
I (made by Nippon Polyurethane) was used. Component (A) and component (B) are NCO / active hydrogen equivalent ratio of component (A) = 1.0
The mixture was used in a stoichiometric ratio of 9. The general properties of the cured product are shown in Table 2.

[0038]

[Chemical 4]

[0039]

[Table 2] Using the three types of polyurethane laminated mortar obtained above, an impact resistance test and a crack followability test were conducted. The results are shown in Table-5.

The combination of the flexible polyurethane 1-curable composition was carried out in Example 1, the combination of the flexible polyurethane 2-curable composition was carried out in Example 2, and the combination of the flexible polyurethane 3-curable composition was carried out. Example 3 is set.

Impact resistance: Falling ball test An iron ball weighing 1 kg from a height of 150 cm is dropped on the waterproof coating structure and the surface state of the coating film is observed.

◯: The surface is not cracked ×: Cracks are generated on the surface Crack followability: KMK method It is measured how many millimeters the span width is expanded by tension from zero span to break the waterproof coating structure. Comparative Examples 1 to 6 In place of the curable composition exhibiting the performance shown in Table 2 as a comparative example, the cured coating film has an epoxy resin having the performance shown in Table 3 (hereinafter abbreviated as epoxy) and no. Except for using a saturated polyester resin (hereinafter abbreviated as polyester), the same procedure as in Examples 1 to 3 was carried out to prepare a waterproof coated mortar.

A flexible polyurethane 1-epoxy combination was used in Comparative Example 1, a flexible polyurethane 1-polyester combination was used in Comparative Example 2, and flexible polyurethane 2-
The combination of epoxy is Comparative Example 3, the combination of flexible polyurethane 2-polyester is Comparative Example 4, the combination of flexible polyurethane 3-epoxy is Comparative Example 5, and the combination of flexible polyurethane 3-polyester is Comparative Example 6.
And

[0044]

[Table 3] Table 4 shows the results of the impact resistance test and the crack followability test in Comparative Examples 1 to 6.

[0045]

[Table 4] As can be seen from Table-4, a construction in which a cured product layer of a curable composition capable of forming a polyurethane having a Shore D hardness of 60 or more and an elongation of 20% or more is laminated on a polyurethane having performance compatible with JISA6021 is It can be seen that even if a crack occurs in the substrate, it has good followability and also has excellent impact resistance.

[0046]

According to the construction method of the present invention, the JI is placed on the base.
Since a polyurethane layer having a Shore D hardness of 60 or more and an elongation of 20% or more is applied on a polyurethane layer conforming to SA6021, curing of an epoxy resin composition or an unsaturated polyester resin composition in the second layer as in the conventional case. As in the case of stacking objects, there is no remarkable effect that the waterproof material layer does not break due to failure to follow the cracks of the substrate and the waterproof material layer does not break due to high impact. Play.

As described above, since the waterproof coating structure of the present invention has excellent impact resistance, it can be applied to the passage of pavement floors and vehicles, and since it also has excellent followability to cracks of the foundation substrate, it can be used as a waterproof floor. Can be said to be an optimal and excellent waterproof coating structure.

Claims (5)

[Claims] 1. A polyurethane-forming curable coating material (I) conforming to JIS A6021 is applied on a substrate, and after the coating material is cured, Shore D hardness is 60 or more and elongation is 20.
% Or more polyurethane-forming curable composition (II)
A method for waterproofing a structure, comprising applying and curing the composition. 2. The waterproof coating method according to claim 1, wherein the curable coating material (I) is a room temperature curable coating material having a Shore A hardness of 20 to 80. 3. The waterproof coating method according to claim 1, wherein the curable composition (II) is room temperature curable. 4. The waterproof coating method according to claim 3, wherein the curable composition (II) contains a polyol type xylene-formaldehyde resin and a polyisocyanate as essential components. 5. The thickness of the cured coating film of the curable coating material (I) and the cured coating film of the curable composition (II) are both 1 mm or more, and the total thickness of the laminated coating film on the substrate. The waterproof coating method according to claim 1, wherein the waterproof coating method is performed so that the dimension is 3 mm or more.