JP2006266042A - Building material and its color tone changing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a building material and its color tone changing method offering a high design possibility and the color tone changing method permitting to intentionally change the color tone while maintaining a coat protecting function without performing repainting or recoating work. <P>SOLUTION: These building material and its color tone changing method comprise a base material 1; a first coloring layer 2 formed on the surface of the base material 1; a second coloring layer 3 formed on the first coloring layer 2, which has a weather resistance lower than that of the first coloring layer 2 with a color tone different from that of the first coloring layer 2; and a clear layer 4 having a weather resistance formed on the surface of the second coloring layer 3 and containing an ultraviolet ray cutting agent capable of blocking the ingress of the ultraviolet ray to the inside, thereby discoloring the second coloring layer 3 by the deterioration caused by the ultraviolet ray in response to the amount of absorption created by the ultraviolet ray resulted from a color tone exposed at the first coloring layer 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a building material and a method for changing the color tone thereof, and more particularly, to a technique for controlling a change in color tone of a building material with time and maintaining a good appearance of the building material without deteriorating the protective function of a coating film. .

In general, it is known that building materials such as exterior building materials undergo a so-called choking phenomenon in which the resin of the coating film is deteriorated by the influence of ultraviolet rays and the color of the resin is dropped with the pigment. This choking phenomenon is accompanied by a change in the color tone of the building material over time, but it cannot be said to be a desired (planned) change because it is discolored. Moreover, since the protective function of the coating film is lowered by the choking phenomenon, the color tone of the base material is finally exposed. Against this background, up to now, repainting and repainting of building materials have been performed as countermeasures against the choking phenomenon. Recently, in order to prevent the occurrence of the choking phenomenon, it has become common to finish building materials with highly weather-resistant paints such as fluorine paints, acrylic silicon paints, and inorganic paints (for example, , See Patent Document 1).
JP-A-6-134393

  By the way, because building materials have been used for a very long time, they feel bored with the design, so there is a need to change the color according to the generation change and life stage. However, with conventional building materials, the only means to meet these needs is repainting and repainting work, and repainting and repainting work are on-site work, and it is necessary to paint advanced designs with excellent design. Therefore, repainting and repainting operations can be performed only with a simple single color. In addition, when performing repainting or repainting, a large-scale operation requiring cost such as manufacturing a scaffold is required, and at the same time, the neighborhood may be inconvenienced. That is, according to the conventional building material, it was not possible to systematically change the color tone having a high degree of design without performing repainting work and repainting work.

  The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a high design capable of systematically changing the color tone while maintaining the protective function of the coating film without performing repainting work and repainting work. It is to provide a sex building material and a method for changing its color tone.

  In order to solve the above problems, a building material according to the present invention includes a base material, a first colored layer formed on the surface of the base material, and a first colored layer formed on the surface of the first colored layer. A second colored layer having a lower weather resistance and having a color tone different from that of the first colored layer; and an ultraviolet ray-cutting agent that is formed on the surface of the second colored layer and has weather resistance and absorbs ultraviolet rays. And a clear layer to be contained, wherein the second colored layer is discolored due to ultraviolet deterioration according to the ultraviolet absorption amount of the ultraviolet cut agent, and the color tone of the first colored layer is exposed.

  Moreover, in order to solve the said subject, the color tone change method of the building material which concerns on this invention is formed on the surface of the base material, the 1st colored layer formed on the surface of the base material, and the 1st colored layer. In addition, the second colored layer having a weather resistance lower than that of the first colored layer and having a color tone different from that of the first colored layer, and a weather resistance formed on the surface of the second colored layer, and having ultraviolet rays. A clear layer containing a UV-cutting agent that absorbs, and according to the UV absorption amount of the UV-cutting agent, the second colored layer fades due to UV degradation and the color tone of the first colored layer is exposed. In addition, the clear layer has a porous property, the ultraviolet ray-cutting agent is zinc oxide powder, and the color tone of the building material is changed by supplying a strongly acidic aqueous solution to the surface of the clear layer.

  According to the building material and the color tone changing method according to the present invention, the second colored layer having low weather resistance is discolored due to ultraviolet deterioration according to the ultraviolet absorption amount of the ultraviolet cut agent contained in the clear layer, and the weather resistance is high. Since the high color tone of the first colored layer is exposed, it is possible to provide a high-design building material whose color tone is changed systematically without performing repainting work and repainting work.

  Further, according to the building material and the color tone changing method according to the present invention, even if the second colored layer is deteriorated by ultraviolet rays, the choking phenomenon does not occur because the clear layer is formed on the surface of the second colored layer. Therefore, the protective performance of the coating film can be maintained.

  Hereinafter, the building material which becomes embodiment of this invention is demonstrated.

  As shown in FIG. 1, the building material according to the present invention includes a base material 1, a first colored layer 2 formed on the surface of the base material 1, and a first colored layer 2 formed on the surface of the first colored layer 2. The first colored layer 2 has a weather resistance lower than that of the first colored layer 2 and has a color tone different from that of the first colored layer 2. The second colored layer 3 is formed on the surface of the second colored layer 3. And a clear layer 4 containing a UV-cutting agent that absorbs UV, and the second colored layer 3 fades due to UV degradation according to the UV-absorbing amount of the UV-cutting agent, and the color tone of the first colored layer 2 is exposed. It is characterized by. That is, in the building material according to the present invention, when ultraviolet rays such as sunlight enter the inside through the clear layer 4, the second colored layer 3 having low weather resistance fades due to ultraviolet deterioration, and the weather resistance is high. The color tone of one colored layer 2 is exposed. At this time, even if the second colored layer 3 deteriorates, the clear layer 4 is formed on the surface of the second colored layer 3, so that no choking phenomenon occurs and the protective performance of the coating film is maintained. Is done.

  In addition, as the base material 1, ceramic materials such as extruded cement board, fiber reinforced cement board, ALC (lightweight concrete), ceramic siding, FRP (PP) reinforced with PP (polypropylene) resin, vinyl chloride and fibers. Examples thereof include, but are not limited to, resin materials such as Fiber Reinforced Plastic) type. For example, the base material 1 may be a metal-based material or a wood-based material mainly composed of aluminum or iron. Moreover, you may add processes, such as a degreasing process, a rust prevention process, antiseptic treatment, and a grinding | polishing process, to the base material 1 as needed. In addition, a primer layer may be formed between the base material 1 and the first colored layer 2 in order to improve the adhesiveness and waterproofness with the first colored layer 2.

  Moreover, as said 1st colored layer 2, although high weather resistance paints and acrylic paints, such as a fluorine-type paint, an acrylic silicon type paint, and an inorganic type paint, can be illustrated, it is not limited to this, It is selected according to the amount of ultraviolet rays at the place where building materials are used. Moreover, as a pigment contained in the 1st colored layer 2, although an inorganic baked pigment which has a weather resistance can be illustrated, it is not limited to this, The amount of ultraviolet rays of the place which uses a building material is used. It is selected as appropriate. Examples of the method for coating the first colored layer 2 on the surface of the substrate 1 include spray coating, roll coating, spin coater, and printing, but are not limited thereto.

  Examples of the second colored layer 3 include, but are not limited to, epoxy resins and urethane resins that have weaker weather resistance than the first colored layer 2. Moreover, as a pigment contained in the 2nd colored layer 3, the organic pigment of the color tone different from the color tone of the 1st colored layer 2 can be illustrated. The film thickness of the second colored layer 3 is preferably thinner than the film thickness of the first colored layer 3. In addition, the pigment and film thickness of the 2nd colored layer 3 are selected according to the amount of ultraviolet rays of the place which uses a building material, and the quantity of the ultraviolet cut agent contained in the clear layer 4. FIG. Moreover, as a coating method of the 2nd colored layer 3 on the 1st colored layer 2 surface, the method similar to the coating method as stated above can be utilized. Moreover, in order to improve the designability of building materials, you may make it give a complicated color tone change by forming the 2nd colored layer 3 in multiple layers.

  The clear layer 4 can be exemplified by materials having transparency and weather resistance, such as fluorine-based materials, acrylic silicon-based materials, and inorganic materials, but is not limited thereto. It is selected according to the amount of ultraviolet rays at the place of use. Note that the clear layer 4 may be slightly colored, such as color clear, or may contain a matting agent or the like. The amount of the UV-cutting agent contained in the clear layer 4 is determined on the basis of the UV-amount of the place where the building material is used and the UV-absorbing ability of the UV-cutting agent for each UV wavelength. It is desirable to verify the UV-cutting ability in advance using an accelerated tester. Moreover, as a coating method of the clear layer 4 on the 2nd colored layer 3 surface, the method similar to the coating method as stated above can be utilized.

  In addition, as the UV-cutting agent, an inorganic UV-cutting agent can be used. In general, since the inorganic ultraviolet blocking agent is at a fine particle (submicron) level, the transparent layer 4 can maintain transparency even after being dispersed in the clear layer 4. Moreover, although the mechanism of the ultraviolet cut of the inorganic ultraviolet cut agent also includes the reflection of ultraviolet rays, the ultraviolet rays are cut mainly by converting the ultraviolet rays into heat energy. Since the ultraviolet blocking ability of the inorganic ultraviolet blocking agent is semi-permanent, the amount of ultraviolet rays entering the second colored layer 3 through the clear layer 4 can be adjusted by adjusting the amount thereof. That is, when the amount of the ultraviolet blocking agent is large, the amount of ultraviolet rays entering the second colored layer 3 through the clear layer 4 is reduced, and the fading of the second colored layer 3 is delayed. On the other hand, when the amount of the ultraviolet blocking agent is small, the amount of ultraviolet rays entering the second colored layer 3 through the clear layer 4 is increased, and the fading of the second colored layer 3 is accelerated and the first colored layer 3 is accelerated. The color tone is exposed. In addition, as an inorganic type ultraviolet cut agent, although a titanium oxide, a zinc oxide powder, etc. can be illustrated, it is not limited to this. Moreover, the ultraviolet cut ability of an inorganic type ultraviolet cut agent can be grasped | ascertained by measuring the ultraviolet cut rate.

  In addition, as the ultraviolet ray blocking agent, an organic ultraviolet ray blocking agent can also be used. In general, an organic UV-cutting agent is excellent in UV-cutting ability, but some have a coloring property such as yellowishness. In addition, organic UV screening agents tend to cause breathing. Breathing is a phenomenon in which when ultraviolet rays are received, the molecules vibrate and move to the surface layer to convert the ultraviolet rays to heat energy, and disappear from the surface layer by sublimation. In addition, it cannot be said that the organic UV-cutting agent has high weather resistance, and the UV-cutting performance deteriorates in several years although there are differences depending on the content and type. However, the number of years that the UV-cut performance is reduced due to the above reasons can be estimated from the results of the UV accelerated test, so use the organic UV-cutting agent as the UV-cutting agent in consideration of the estimated number of years. Can do. Examples of the organic ultraviolet blocking agent include benzophenone-based materials and benzotriazole-based materials, but are not limited thereto.

  Further, the clear layer 4 may not be uniform on the entire surface of the second colored layer 3 but may be formed at a predetermined position on the surface of the second colored layer 3. In this case, the second colored layer 3 portion (coating region) on which the clear layer 4 containing the UV-cutting agent is formed on the surface is delayed in color tone change, but the second layer in which the clear layer 4 is not formed on the surface. The color tone of the colored layer 3 portion (non-application region) changes from an early stage. Thereby, a different color tone change is given for every area | region of the 2nd colored layer 3, and design property can be improved by giving a complicated color tone change. In addition, by forming a plurality of clear layers 4 on the entire surface of the coating region or at a predetermined position, the amount of ultraviolet light entering the second colored layer 3 can be changed, and the design can be improved by more complicated color change. It may be. Specifically, when the second colored layer 3 portion having two, one, and zero clear layers 4 formed on the surface is formed, the second colored layer 3 portion having two clear layers 4 formed. Takes a long time to fade, and conversely, the second colored layer 3 portion where the clear layer 4 is not formed fades quickly and the color tone of the first colored layer 2 dominates. The degree of change will be different.

  In addition, a third colored layer having a color tone different from that of the second colored layer 3 is formed on the surface of the clear layer 4, and an ultraviolet cut agent that has weather resistance and absorbs ultraviolet rays is formed on the surface of the third colored layer. You may make it form the 2nd clear layer to contain. In this case, initially, the color tone of the third colored layer appears dominantly, but with the passage of time, ultraviolet rays such as sunlight pass through the second clear layer and deteriorate the third colored layer, The colored layer 3 fades, and the color tone of the second colored layer 3 appears dominantly through the clear layer 4. Then, as time elapses, the ultraviolet rays pass through the clear layer 4 and deteriorate the second colored layer 3, so that the second colored layer 3 fades and the color tone of the first colored layer 2 appears dominantly. Become. A pair of the third colored layer and the second clear layer may be further formed on the surface of the plurality of layers.

  Further, the clear layer 4 is formed to have a porous property, and a building material is formed using zinc oxide powder as an ultraviolet ray-cutting agent, and a strongly acidic aqueous solution such as nitric acid or hydrochloric acid is supplied to the surface of the building material. Thus, the color tone of the building material may be changed intentionally. According to such a method, when the strongly acidic aqueous solution enters the clear layer 4, the ultraviolet blocking agent in the clear layer 4 is eluted, and the ultraviolet blocking ability of the clear layer 4 is lost. When the layer 3 fades and the color tone of the first colored layer 2 appears, the color tone of the building material can be easily changed. Examples of the method for imparting the porous property to the clear layer 4 include a method in which a filler is mixed, dehydration and demelting at the time of curing is performed, or foaming is performed. Of course, a material having better acid resistance than zinc oxide is used for the clear layer 4.

  The resin composition of the clear layer 4 is desirably an inorganic resin. In general, an organic resin such as a fluorine-based resin or an acrylic silicon-based resin is a weather-resistant resin. However, since the organic main skeleton is a C—C bond, ultraviolet deterioration occurs. On the other hand, since the main skeleton of the inorganic resin is a strong Si—C bond, ultraviolet degradation is unlikely to occur, and the function as a protective film can be maintained for a long time.

  Examples of the present invention and comparative examples will be described below. In the following description, “part” and “%” represent “part by weight” and “% by weight”, respectively.

[Example 1]
In Example 1, first, an acrylic silicon emulsion type paint for building materials was baked on the surface of the JIS slate plate to a film thickness of about 80 [μm]. Next, ink was applied on the surface of the paint by relief printing at a plate temperature of about 50 [° C.]. The ink has a lower weather resistance than an acrylic silicone emulsion type paint in which 65 parts of pigment is mixed with 35 parts of urethane solvent type resin, and the film thickness is about 1 [μm] or less. Finally, a clear layer of acrylic silicon resin was applied on the ink surface to a thickness of about 20 [μm]. Acrylic silicon resin is prepared by pre-dispersing alumina and silica-coated fine particle zinc oxide (particle size 0.2 to 0.5 [μm]) as a UV-cutting agent to produce a mill base. A mill base and an acrylic silicon resin are prepared so that the solid content of zinc oxide is 1% with respect to the solid content, and silica powder with an average particle diameter of 6 [μm] is used as a matting agent to achieve 1 [ %] Was added.

[Example 2]
In Example 2, an acrylic silicon resin was prepared in the same manner as in Example 1 except that the mill base and the acrylic silicon resin were prepared so that the solid content of zinc oxide was 3% with respect to the solid content of the acrylic silicon paint. .

Example 3
In Example 3, an acrylic silicon resin was prepared in the same manner as in Example 1 except that a benzophenone-based organic material was used as the UV-cutting agent. . Note that the benzophenone-based organic material was diluted with a toluene solvent and prepared so as to have an addition amount of 3% relative to the solid content of the acrylic silicon resin. In Example 3, the acrylic silicon layer is yellowish with a benzophenone-based UV-cutting agent and becomes a color clear layer.

[Comparative Example 1]
In Comparative Example 1, an acrylic silicon resin was prepared in the same manner as in Example 1 except that the acrylic silicon resin was not clear-coated on the ink surface.

〔Test results〕
Table 1 below shows the results of measuring the ultraviolet cut rates of Examples 1 to 3 and Comparative Example 1. In addition, the initial ultraviolet cut rate is the same as that used in Example 1 in which the same amount of UV-cutting agent and matting agent-containing acrylic silicon resin is applied to a glass plate, and ultraviolet rays (measurement wavelength is 360 [nm]). It was measured by measuring the cut rate. The test was conducted according to the JIS Sunshine Weatherometer test method. According to this test method, it is said that a test time of 5,000 hours corresponds to an actual 10 to 13 years in the case of an outer wall material, and a test time of 10,000 hours corresponds to an actual 20 to 25 years.

  As shown in Table 1, as a result of performing the above test, it can be seen that the color tone of the building materials of Examples 1 to 3 systematically changes from the color tone of the ink to the color tone of the acrylic silicone emulsion resin over time. . On the other hand, the building material of Comparative Example 1 was found to be fragile and disappear even when the acrylic silicone emulsion resin deteriorates because the surface layer does not have a clear layer containing an ultraviolet screening agent. From the above, according to the building materials of Examples 1 to 3, it became clear that the color tone can be changed in a planned manner while maintaining the protective function of the coating film.

Example 4
In Example 4, first, an acrylic silicon emulsion type paint for building materials was baked on the surface of the JIS slate plate to a film thickness of about 80 [μm]. Next, ink was applied on the surface of the paint by relief printing at a plate temperature of about 50 [° C.]. The ink has a lower weather resistance than an acrylic silicone emulsion type paint in which 65 parts of pigment is mixed with 35 parts of urethane solvent type resin, and the film thickness is about 1 [μm] or less. Finally, after coating a clear layer of acrylic silicon resin containing an ultraviolet cut agent on the ink surface with a film thickness of about 20 [μm], an acrylic silicon resin containing an ultraviolet cut agent and a matting agent is applied by letterpress printing. A film thickness of about 10 [μm] was formed. Acrylic silicon resin is prepared by pre-dispersing alumina and silica-coated fine particle zinc oxide (particle size 0.2 to 0.5 [μm]) as a UV-cutting agent to produce a mill base. A mill base and an acrylic silicon resin are prepared so that the solid content of zinc oxide is 1 [%] with respect to the solid content of the acrylic silicon paint as a matting agent with silica powder having an average particle size of 6 [μm]. %] Was added.

Example 5
In Example 5, first, an acrylic silicon emulsion type paint for building materials was baked on the surface of the JIS slate plate to a film thickness of about 80 [μm]. Next, ink was applied on the surface of the paint by relief printing at a plate temperature of about 50 [° C.]. The ink was obtained by blending 65 parts of pigment with 35 parts of urethane solvent type resin, and the film thickness was about 1 [μm] or less. Next, a clear layer of acrylic silicon resin containing an ultraviolet blocking agent is applied on the ink surface to a thickness of about 20 [μm]. Acrylic silicon resin is prepared by pre-dispersing alumina and silica-coated fine particle zinc oxide (particle size 0.2 to 0.5 [μm]) as a UV-cutting agent to produce a mill base. A mill base and an acrylic silicon resin were prepared so that the solid content of zinc oxide was 1%. Finally, after applying ink (resin part 35 parts, pigment 65 parts) with a film thickness of 1 [μm] or less by letterpress printing on the acrylic silicon resin surface, acrylic containing 1 [%] UV-blocking agent was added. About 20 [μm] of silica resin was applied.

〔Test results〕
Table 2 below shows the results obtained by measuring the ultraviolet cut rates of Examples 4 and 5 above. The test method is the same as the test method described above.

  As shown in Table 2, as a result of performing the above test, the ink area (urethane ink printing layer) in which the clear layer containing the ultraviolet ray cutting agent is formed does not change the color tone, but contains the ultraviolet ray cutting agent. It was found that the color tone of the ink region where the clear layer was not formed was changed by the ultraviolet rays passing through the clear layer, and the color tone of the acrylic silicone emulsion resin was exposed. Therefore, by forming a pattern on the urethane ink layer, a complicated and advanced color tone change can be expressed.

Example 6
In Example 6, first, an acrylic silicon emulsion type paint for building materials was baked on the surface of the JIS slate plate to a film thickness of about 80 [μm]. Next, ink was applied on the surface of the paint by relief printing at a plate temperature of about 50 [° C.]. The ink has a lower weather resistance than an acrylic silicone emulsion type paint in which 65 parts of pigment is mixed with 35 parts of urethane solvent type resin, and the film thickness is about 1 [μm] or less. Next, a clear layer of acrylic silicon resin containing an ultraviolet blocking agent is applied on the ink surface to a thickness of about 4 [μm]. In addition, a pure water fine particle zinc oxide (particle size 0.2 to 0.5 [μm]) not coated with alumina or silica is previously dispersed in the acrylic silicon resin as a UV-cutting agent to prepare a mill base, and acrylic A mill base and an acrylic silicon resin were prepared so that the solid content of zinc oxide was 30% with respect to the solid content of the silicon paint. A large amount (about 20 [%]) of silica powder having an average particle size of 6 [μm] was added as a matting agent to the solid content of the acrylic silicon paint. The thickness of the acrylic silicon coating film is as thin as about 4 [μm], but the acrylic silicon coating film becomes porous by using a large silica powder. The test was conducted for 5000 hours with a sunshine weatherometer, and after confirming that there was no change in appearance, the surface was washed with hydrochloric acid having a pH of 2, and the washed building material was further subjected to a weather resistance test for 500 hours with a sunshine weatherometer. Went.

Example 7
In Example 7, an acrylic silicon resin was prepared in the same manner as in Example 6 except that a weather resistance test was further performed for 500 hours with a sunshine weatherometer without acid cleaning.

〔Test results〕
Table 3 below shows the results of measuring the UV cut rates of Examples 6 and 7. The test method is the same as the test method described above.

  As shown in Table 3, as a result of the above test, in the building material of Example 6, since the acrylic silicon coating film has a porous property, when acid cleaning is performed, zinc oxide plays the role of an ultraviolet blocking agent. It was found that the performance of UV protection was lost. Therefore, according to the building material of Example 6, the color tone of the building material can be easily changed by performing acid cleaning when it is desired to change the color.

[Examples 8 and 9]
In Examples 8 and 9, first, an acrylic silicon emulsion type paint for building materials was baked on the surface of the JIS slate plate to a film thickness of about 80 [μm]. Next, ink was applied on the surface of the paint by relief printing at a plate temperature of about 50 [° C.]. The ink has a lower weather resistance than an acrylic silicone emulsion type paint in which 65 parts of pigment is mixed with 35 parts of urethane solvent type resin, and the film thickness is about 1 [μm] or less. Finally, the inorganic paints A and B containing the ultraviolet light blocking agent are painted clear. In this example, 40 parts of finely divided zinc oxide having an average particle size of 0.2 to 0.5 [μm], 50 parts of a carboxylic acid-based dispersant, and 5 parts of a diluent solvent with respect to 50 parts of methyltrimethoxysilane. Add, stir with a disper for about 30 minutes, add 1mm beads, and disperse with a disperser ("Dynomill" manufactured by Shinmaru Enterprises, flow rate 25kg / hr, 5 times with 1.5 [l] vessel capacity) Thus, a fine particle zinc oxide mill base was prepared. Then, the mill base and inorganic coatings A and B were prepared so that the solid content of zinc oxide was 6%. Further, as a matting agent, silica powder having an average particle size of 6 [μm] was added by 1 [%] with respect to the solid content of the inorganic coating resin. The coating amount was about 20 [μm]. The difference between Examples 8 and 9 is that inorganic paint A was baked at 140 ° C. for 10 minutes in Example 8, whereas inorganic paint B was cured at room temperature in Example 9. .

In addition, the inorganic coating material A includes (1) 100 parts of methyltrimethoxysilane, 20 parts of tetraethoxysilane, 150 parts of isopropyl alcohol organosilica sol (“OSCAL1432” manufactured by Catalytic Chemical Industry Co., Ltd., SiO ₂ content 30 [%]) , 40 parts of dimethylmethoxysilane, and 100 parts of isopropyl alcohol, (2) 200 parts of water are added and stirred, and (3) the molecular weight Mw is adjusted to 1200 in a 60 [° C.] thermostat. Prepared.

Moreover, the inorganic coating material B was prepared by mixing and stirring the components (a), (b), and (c) shown below at a ratio of 65 parts, 50 parts, and 1 part, respectively. Component (a) is (1) Isopropyl alcohol-dispersed colloidal silica sol (“IPA-ST” manufactured by Nissan Chemical Industries, Ltd., particle size 10-20 [μm] in a flask equipped with a stirrer, heating jacket, condenser, and thermometer. ], Solid content 30 [%], H ₂ 0: 0.5 [%]) 100 parts, methyltrimethoxysilane 68 parts, dimethyldimethoxysilane 18 parts, water 2.7 parts, and acetic anhydride 0.1 part. (2) A partial hydrolysis reaction was carried out at 80 [° C.] for about 3 hours with stirring, and (3) the mixture was cooled. The solid content of component (a) after standing at room temperature for 48 hours was 36 [%]. The preparation conditions for component (a) were as follows: the number of moles of water per mole of hydrolyzable group: 0.1 mole, the silica content of component (a): 40.2 [%], and hydrolysis of n = 1 Mol% of the functional group-containing organosilane: 77 mol%.

  Component (b) consists of (1) 1000 parts of water and 50 parts of acetone in a flask equipped with a stirrer, heating jacket, condenser, dropping funnel and thermometer, and (2) methyltrichlorosilane in the mixed solution. A state in which 59.7 parts (0.4 mol), 51.6 parts (0.4 mol) of dimethyldichlorosilane and 42.3 parts (0.2 mol) of phenyltrichlorosilane were dissolved in 200 parts of toluene was stirred. (3) Stirring was stopped after 40 minutes of dropping, and the reaction solution was transferred to a separatory funnel and allowed to stand. (4) The lower layer hydrochloric acid separated into two layers was separated and removed. (5) The toluene solution of the organopolysiloxane in the upper layer is removed by stripping off the remaining water and hydrochloric acid together with excess toluene by stripping under reduced pressure to remove a sieve having an average molecular weight of 3000. 60 [%] in toluene Nord group-containing organopolysiloxane solution was obtained. This has a phenyl group content of 14% in R4. In component (c), N-β-amintyer-γ-aminopropylmethyldimethoxysilane was used as a curing catalyst.

〔Test results〕
Table 4 below shows the results of measuring the UV cut rates of Examples 8 and 9 above. The test method was the same as the test method described above, and the test was performed one week after the sample was prepared.

  As shown in Table 4, as a result of performing the above tests, the inorganic coating films (paints) A and B in Examples 8 and 9 have a strong Si—O bonding force of the main skeleton, and thus are affected by ultraviolet deterioration. I found it difficult to receive. 15,000 hours of sunshine weatherometer is roughly equivalent to 30-35 years. Therefore, the longer the test time, the better the weather resistance of the inorganic paint. In addition, the color tone after 20,000 hours of Examples 8 and 9 was changed to the color tone of the acrylic silicone emulsion because the color of the printed layer disappeared.

  As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the description and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the above embodiments are all included in the scope of the present invention.

It is sectional drawing which shows the structure of the building material used as embodiment of this invention.

Explanation of symbols

1: Base material 2: First colored layer 3: Second colored layer 4: Clear layer

Claims (6)

A substrate;
A first colored layer formed on the surface of the substrate;
A second colored layer formed on the surface of the first colored layer, having a weather resistance lower than that of the first colored layer and having a color tone different from that of the first colored layer;
A clear layer formed on the surface of the second colored layer, having weather resistance and containing an ultraviolet-cutting agent that absorbs ultraviolet rays;
The building material according to claim 1, wherein the second colored layer is discolored due to ultraviolet deterioration according to an ultraviolet absorption amount of the ultraviolet cut agent, and a color tone of the first colored layer is exposed. The building material according to claim 1,
The building material according to claim 1, wherein the ultraviolet blocking agent is an inorganic ultraviolet blocking agent. The building material according to claim 1,
The building material according to claim 1, wherein the UV-cutting agent is an organic UV-cutting agent. The building material according to any one of claims 1 to 3,
The clear layer is formed at a predetermined position on the surface of the second colored layer. The building material according to any one of claims 1 to 4,
A third colored layer formed on the surface of the clear layer and having a color tone different from that of the second colored layer;
A second clear layer that is formed on the surface of the third colored layer and has a weather resistance and contains an ultraviolet ray-cutting agent that absorbs ultraviolet rays;
According to the ultraviolet absorption amount of the ultraviolet cut agent, the color of the second colored layer and the first colored layer is sequentially exposed by fading the third colored layer and the second colored layer in order due to ultraviolet deterioration. A building material characterized by A method for changing the color of a building material,
The clear layer has a porous property, and the ultraviolet blocking agent uses zinc oxide powder as the building material according to any one of claims 1 to 4, and supplies a strongly acidic aqueous solution to the surface of the clear layer. A method for changing the color tone of a building material, wherein the color tone of the building material is changed.

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