JP2827075B2 - Waterproofing method for small edge of ceramic plate and coating composition used for the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of waterproofing a small edge of a ceramic board, particularly an exterior material, and a coating composition used in the method.

[0002]

2. Description of the Related Art In recent years, a dry construction method using a ceramic plate mainly composed of cement as an exterior material has been frequently employed, and the plate thickness is most often 8 to 20 mm. The bulk specific gravity is 0.8 ~
It is as small as 1.0, and the water content is about 10% by weight. As the component, 90% by weight is composed of an inorganic substance such as cement, and the others are composed of fibers. Permeability is 10cc / 75φ
It has been more than a day, and it is quite porous and therefore has water absorption. Therefore, it is necessary to provide a sufficient waterproof layer on the surface of the plate material in order to use it as an exterior material. As a general method, a moisture-curable urethane resin is applied to harden the surface layer of the plate material, fill the porous portion with the resin, and improve the adhesion of the paint applied on the upper portion. In this case, the moisture-curable urethane resin does not form a layer, and the coating applied on the top forms a film to waterproof.

On the other hand, in recent years, the number of cases where breathability is required as a waterproof treatment layer of an exterior material is increasing. The reason for this is that moisture accumulates in the plate material, which helps to separate out the alkali components, and eventually the coating film is destroyed by the moisture from the contact surface between the plate material and the coating film. This is because it needs to be moved. In addition, dew condensation in a cold region due to accumulated moisture causes destruction of a plate material due to volume expansion, which is a serious problem. The idea of waterproofing while maintaining air permeability is to impregnate the surface of the plate material and the pore wall surface of the porous portion connected to the surface without forming a highly water-repellent substance into a film. As the substance having a high water-repellency, a silicone-based permeable water-absorbing material is frequently used, and a siloxane oligomer (trade name, Aqua Seal # 200S, Sumitomo Seika Co., Ltd.)
Is one of them.

[0004] However, in the case of using a ceramic plate as an exterior material, a standard dimension is 455 mm x 3000 mm. However, when an exterior material is attached to a building, it is not always sufficient to use only the standard dimension. If another size or shape is required, the plate must be cut and a new edge is created. In particular, in the case of an accessory, a small-sized plate material is used because it is cut and used.

[0005] The plate material is cut by a machine using a rotary saw, commonly called a panel saw. However, although it is lightweight, it cuts hardened cement, so that the rotary saw blade is rapidly consumed. Therefore, when cutting in large quantities, the composition of the plate material on the cut surface changes considerably. When cutting using a new saw blade, the cut surface can be cut while maintaining the composition of the plate material, but as the saw blade wears, it will look like cutting while destroying the composition, so fine powder Can penetrate into the composition or adhere to the surface and remain.

[0006] In a cutter-type cutting machine that cuts a groove in a plate material, a dense cut surface that shines black is formed.

As described above, the formation of the waterproof layer of the ceramic building material is not limited not only to the surface of the plate material but also to the cut surface, that is, the formation of the small waterproof layer. Must. This is because, when the adhesion of the coating film applied on the upper surface of the plate material on which the waterproof layer is formed is poor, the coating film peels off due to the contraction of the sealing material filling between the small edges, so that rainwater directly hits the small edge. As a result, a water film is formed on the surface of the forehead, and so-called freezing damage occurs in which the forehead is gradually destroyed by repeated freezing and thawing.

[0008]

An object of the present invention is to provide a method for preventing the formation of a stable waterproof layer on small mouths having different surface properties, and a coating composition serving as a base material having good adhesion of a coating film. It will not be provided.

[0009]

According to the present invention, a method for waterproofing a small-sized mouthpiece of a ceramic-based sheet material includes siloxane oligomer 100 (weight) , which is a silicone-based permeable water-absorbing material.
%) To 10 to 100 (% by weight ) of an isocyanate-based moisture-curable urethane resin.
After coating and impregnating on the small face of ceramic plate to form a waterproof layer, further apply a paint such as vinyl chloride resin, acrylic resin, or acrylic urethane resin on the waterproof layer to form a protective layer. It can form a waterproof, frost-resistant edge.

[0010] The siloxane oligomer 100 is permeable water absorption preventing agent of silicone to (wt%) of isocyanate-based moisture-curable urethane resin of 10 to 100 (wt%) as a coating composition for use in the treatment method added By using a mixture, it is possible to perform painting with a hand roll without spray painting, which is suitable for safety and hygiene, and also eliminates the need for double painting.

[0011]

EXAMPLE An example of a test for evaluating the state before improvement is shown in Table 1. This was performed in order to see the effect of the waterproof layer and the undercoating treatment on the variation in the composition of the plate material and the properties of the fore-edge due to the cutting blade. As production lots, two lots located at both ends in the standard were selected and designated as lot A and lot C. The coating film was coated with an embi paint (V-Seran # 200 Sealer K, manufactured by Dainippon Paint Co., Ltd.).
Moisture-curable urethane resin (V-Seran # 100 sealer, Dainippon Paint Co., Ltd.) as a coating material impregnated in the plate material
Manufactured by V Selan # 100) and a siloxane oligomer (Aqua Seal # 200S; manufactured by Sumitomo Seika Co., Ltd .; hereinafter referred to as Aqua Seal). As the plate material, a special cement-based extruded material having a thickness of 16 mm was used. The results shown in Table 1 are for the adhesion of the coating film. In that respect, V-Seran # 100, which is a moisture-curable urethane resin originally provided as a sealer, is more effective than Aqua Seal for waterproofing. I cannot deny that is.

[0012]

[Table 1]

Examining Table 1 for aqua seals, it can be seen that it greatly depends on the variation of the production lot of the plate material and the properties of the cut surface of the fore edge. Building materials are often cut to various sizes and in large quantities, and it is impossible to carefully examine individual foreheads. Aqua seals penetrate into the porous material of the plate material without forming a film with an impregnating coating agent, and low-molecular siloxane oligomers are fixed on the side surfaces of the fine pores, and the water inside the plate material or in the air It undergoes a hydrolysis reaction with the components to be polymerized and exhibits a water-repelling characteristic of silicon. This situation is schematically shown in FIG. The water that is going to enter the hole 1 tends to penetrate by capillary action, but is prevented by the water release of the silicon component of the aqua seal 2.

Next, an isocyanate-based moisture-curable urethane resin will be considered. This coating material also impregnates the porous material of the plate material and causes a urethane reaction with moisture in the air or in the plate material to be cured, but this resin has the property of filling gaps in the plate material and strengthens the structure of the impregnated part I do. Theoretically, the porous body of the ceramic plate may be shown as in FIG. 1, but in actuality, at the fore edge cut with a blade,
The constitution is such that destruction and cutting live together. As shown in FIG. 2 as a schematic diagram, cement hydrates a and b and fibers c are mixed with connectivity. Actually, vibration and heat due to the impact of the blade are applied to the fore edge, so that the cement hydrate, fiber and the like that are connected lose connectivity. Therefore, the property that the moisture-curable urethane resin fills the gaps and cures serves to strengthen the surface layer of the base material and to serve as an anchor for the paint applied on the upper layer.

As described above, the siloxane oligomer (trade name, Aqua Seal # 200S) and the moisture-curable urethane resin (trade name, V-Selan # 100 Sealer) are both impregnated but have different functions. Do not cause a chemical reaction with each other. Aqua Seal itself has high waterproofness, but originally appeared as a concrete protective material, and exhibits extremely excellent waterproofness against gaps that cause the capillary action of concrete.
An object of the present invention is to improve the waterproofness of a ceramic plate material containing cement as a main component and to improve the adhesion of a coating film, and is different from the purpose of waterproofing concrete.

From a general point of view, it is just right to apply an aqua seal first, so that in order to observe the degree of impregnation, about 1% of the toner is dispersed in the aqua seal and turned pink. Colored. It was applied to the forehead with a brush so as not to color. Each coating amount was limited to about 180 g in terms of m ² . The reason for performing the brush coating is that the aqua seal is placed in a predetermined container, the weight is measured, the remaining amount after application is measured, and the difference is used as the application amount for convenience. Further, V Seran # 100 was similarly brush-coated on the upper portion so that the surface was not sticky. At this time, the application amount was limited to 150 g. Conversely, when the amount of application of the aqua seal increases due to the properties of the forehead, the amount of V-Selan # 100 decreases. this is,
It is presumed that the water seal of the Aqua Seal works.
Tests as shown in Tables 2 and 3 were performed in order to know an appropriate coating amount. First apply aqua seal and then V selang #
24 hours after applying 100, apply embi paint and apply 2mm
Was cut with a cutter, and a peeling test using a cellophane tape was performed.

[0017]

[Table 2]

[0018]

[Table 3]

When the results shown in Tables 2 and 3 were evaluated, the influence of the aqua seal appeared strongly when the aqua seal and V-Selan # 100 were repeatedly applied to the ceramic plate. In other words, the water release effect of the silicon component began to appear, and V-Seran # 10
There is a tendency to inhibit impregnation of 0. V Serang # 100
This is why adhesion cannot be obtained when the weight is 160 g or more. Further, when the aqua seal exceeded 160 g, it began to bend onto the surface of the plate material, and could not accept substances to be applied later. The point that can be evaluated in this test is that the total coating amount is 28
It is effective that the amount is about 0 g / m ² or less, and it can be said that the central quantity is that the applied amount of each is almost equal. However, in order to make the method of re-coating twice at the work site as described above, the properties of the small edge of the plate material and the aqua seal to be applied first are affected. It is difficult to judge, and it is judged that it is not appropriate.

Therefore, the present inventors speculated that even if a predetermined amount of a mixture of a siloxane oligomer and a moisture-curable urethane resin was applied in a predetermined amount, the same effect as in repeated coating could be expected, and the following test was carried out. . That is, Aqua Seal as a siloxane oligomer and V-Seran # 100 as a moisture-curable urethane resin were prepared, and Aqua Seal was prepared.
100% (% by weight) , V-Selan # 100 was added and mixed in a weight ratio of 5%, 10%, 80%, 90%, 100%, and 110%, respectively. Was evaluated for adhesion. As an overcoat layer, 110 g / m ^{2 of a} coating material of embi series V-Seran # 200 was applied, dried, and then cut with a 2 mm cut edge to evaluate the adhesion. The results are shown in Table 4. It can be seen that the range of the coating amount is much wider than in the case of multiple coating. This means that a highly safe plate material can be provided even if the painting work varies at the work site.

[0021]

[Table 4]

Table 5 shows the results of a small-mouth water absorption test and a close contact test performed on the test piece with a central coating amount based on the above results. One 16mm thick special cement extruded material
Cut into pieces of 5 cm x 15 cm with a circular saw, and paint one edge under the conditions shown in Table 5, while the other edge and the front and back surfaces were completely covered with a paraffin-based sealing material. To 2
After dipping for 4 hours and measuring the amount of water absorption, the adhesion of the coating film was measured. It was found that the adhesion of the coating film was poor with only Aqua Seal, and that V Selan # 100 alone was inferior in water absorbency to that containing Aqua Seal. The painted surfaces of these test pieces faced each other at a distance of 10 mm, and the gap was filled with a silicone-based sealing material and left for one month. A force was applied to separate them. No peeling occurred.

[0023]

[Table 5]

[0024]

As described above, the present invention provides a resin composition by mixing an isocyanate-based moisture-curable urethane resin with a siloxane oligomer as a silicone-based osmotic water-absorbing preventive material. By painting on the forehead,
This eliminates the need for recoating, and provides a protective layer with a high degree of adhesion that is stable and can cope with variations in the properties of the small mouth, as individual properties are exhibited.

In addition, the problem of health due to painting such as spraying when the isocyanate-based moisture-curable urethane resin alone is used is also advantageous in terms of safety and health because the mixture can be applied by a hand roll.

[Brief description of the drawings]

FIG. 1 is a partial vertical cross-sectional view of a plate material schematically showing a state in which a coating material is impregnated into a hole portion of a ceramic plate material.

FIG. 2 is a vertical cross-sectional view schematically showing a small edge of a cut ceramic plate.

[Explanation of symbols]

 Reference Signs List 1 hole 2 aqua seal a, b cement hydrate c fiber

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) C04B 41/71 C04B 41/62-41/64 C09D 175/00-175/16 C09D 183/00-183/16

Claims (2)

(57) [Claims] 1. A coating composition prepared by adding 10 to 100 (% by weight) of an isocyanate-based moisture-curable urethane resin to 100 % (% by weight) of a siloxane oligomer, which is a silicone-based permeable water-absorbing inhibitor, and mixing the mixture. A ceramic system characterized by forming a waterproof layer by impregnating on a small surface of a plate material and further applying a paint such as vinyl chloride resin, acrylic resin, or acrylic urethane resin on the waterproof layer to form a protective layer. Waterproofing method for small edge of plate material. 2. A coating composition obtained by adding 10 to 100 (% by weight) of an isocyanate-based moisture-curable urethane resin to 100 % (% by weight) of a siloxane oligomer which is a silicone-based permeable water-absorbing inhibitor.