JPH0782053A - Waterproofing treatment to edge of ceramic-based plate material and coating composition used for the same treatment - Google Patents

Abstract

PURPOSE:To provide a method for waterproofing treatment, capable of forming a stable waterproofing layer on the edge of a cut ceramic-based plate material, even on an edge having different surface properties and to obtain a coating composition suitable for the treatment. CONSTITUTION:This treatment method is carried out by admixing 10 to 100wt.% isocyanate-based moisture-setting urethane resin with a siloxane oligomer as a silicone-based penetration type water-absorption-resistant agent to prepare a coating composition, applying this coating composition to the edge surface of a ceramic-based plate material, impregnating the edge surface therewith to form a waterproofing layer and further applying a coating material of a vinyl chloride resin, an acrylic resin, an acrylurethane resin, etc., to the waterproofing layer to form a protective layer. In this method, the coating composition is applied in a prescribed ratio and a stable waterproofing layer can be formed thereby even on various kinds of edges having various kinds of properties.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In recent years, a dry method in which a ceramic-based plate material containing cement as a main component is used as an exterior material is often adopted, and the plate thickness is most preferably 8 to 20 mm. Also, the bulk specific gravity is 0.8-
It is as small as 1.0 and the water content is about 10% by weight. As a component, 90% by weight is an inorganic substance such as cement and the other components are fibrous. Permeability is 10cc / 75φ
It is more than a day and has water absorption due to its porous nature. Therefore, in order to use it as an exterior material, it is necessary to provide a sufficient waterproof layer on the surface of the plate material. As a general method, a moisture-curable urethane resin is applied to cure the surface layer of the plate material, the porous portion is filled with the resin, and the adhesion of the coating material applied to the upper portion is improved. In this case, the moisture-curable urethane resin does not form a layer, and the coating material applied to the upper portion forms a film to be waterproof.

On the other hand, in recent years, the number of cases in which air permeability is required as a waterproof treatment layer for an exterior material is increasing. The reason is that moisture accumulates in the plate material, promotes the protrusion of alkaline 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, the dew condensation in the cold district due to the accumulated moisture causes the destruction of the plate material due to the 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 wall surface of the pores of the porous portion connected to the surface without forming a film with a high water-repellent property. As highly water-repellent substances, silicone-based permeable water-absorption preventing materials are often used. Siloxane oligomers (trade name, Aquaseal # 200S, Sumitomo Seika Co., Ltd.)
(Made) is one of them.

However, in the case of using the ceramic plate material as the exterior material, the standard size is 455 mm × 3000 mm, but when the exterior material is attached to the building, the standard size is not always sufficient. If other sizes or shapes are required, the plate must be cut, and a new edge is always created. In particular, the accessory has many small edges because it is used by cutting it from a plate material having a standard size.

The plate material is cut by a machine using a rotary saw, which is commonly called a panel saw. However, although it is lightweight, it hardens the cement hardened material, so that the rotary saw blade wears out significantly. Therefore, when cutting a large amount, the composition of the plate material on the cut surface changes considerably. When cutting with a new saw blade, the cutting surface can be cut while maintaining the composition of the plate material as it is, but if the saw blade wears, it will be cut while destroying the composition, so fine powder Enter into the composition or adhere to the surface and remain, thus forming a fairly rough surface as a small edge.

Further, in a cutter type cutting machine for cutting a groove in a plate material, a dense cutting surface that produces black light is formed.

As described above, special attention should be paid to the formation of the waterproof layer of the ceramic building material, not to mention the surface of the plate material, but also to the cut surface, that is, the surface having a different property when forming the small waterproof layer. I have to. This is because when the adhesion of the coating film applied to 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 that fills the gap between the small edges so that rainwater directly hits the small edges. Then, a film of water is formed on the surface of the forehead, and the so-called frost damage occurs in which the forehead is gradually destroyed by repeatedly freezing and thawing.

[0008]

The problem to be solved is to provide a method of preventing treatment capable of forming a stable waterproof layer on a forehead having different surface properties, and a coating composition as a base having good adhesion of the coating film. It is intended to be provided.

[0009]

As a waterproofing method for the small edge of the ceramic plate material of the present invention, 10 to 100 of isocyanate type moisture-curable urethane resin is added to siloxane oligomer which is a silicone type penetrating water absorption preventing material.
(% By weight) The coating composition mixed and mixed is applied on the small edge surface of the ceramic plate material to impregnate it to form a waterproof layer, and then a vinyl chloride resin, an acrylic resin, an acrylic urethane resin or the like is further formed on the waterproof layer. By applying the above paint as a protective layer, it is possible to form a small mouth that is waterproof and freeze-resistant.

Further, as a coating composition used in the above treatment method, 10 to 100 (% by weight) of an isocyanate type moisture-curable urethane resin is added to and mixed with a siloxane oligomer which is a silicone type penetrating water absorption inhibitor. By doing so, it is possible to apply with a hand roll without spray painting, which is suitable from the viewpoint of safety and hygiene, and the trouble of double application is unnecessary.

[0011]

EXAMPLES An example of a test for evaluating the state before improvement is shown in Table 1. This was performed to see the effect of the waterproof layer and the base treatment on the variation in the composition of the plate material and the property of the edge due to the cutting tool. As the production lot, two lots located at both ends within the standard were selected and designated as lot A and lot C. Further, the coating film is a coating material of ENBI type paint (V Seran # 200 Sealer K, manufactured by Dainippon Paint Co., Ltd.).
Moisture-curing urethane resin (V Seran # 100 sealer, Dainippon Paint Co., Ltd.) as a coating agent impregnated into the plate material
Manufactured by V-Seran # 100) and siloxane oligomer (Aquaseal # 200S, manufactured by Sumitomo Seika Chemicals Co., Ltd., hereinafter referred to as Aquaseal), and described as # 100 and Aquaseal in the table, respectively. 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 intended for the adhesion of the coating film, and in that respect, V-Celan # 100, which is a moisture-curing urethane resin originally provided as a sealer, is more effective than an aqua seal intended for waterproofing. I cannot deny the point.

[0012]

[Table 1]

When Table 1 is examined for an aqua seal, it is found that it is greatly influenced by the variation in the manufacturing lot of the plate material and the property of the cut surface of the edge. Since it is often cut into various sizes for construction materials and in large quantities, it is first impossible to carefully inspect each individual edge. AQUASEAL penetrates into the porous material of the plate without forming a film with an impregnating type coating agent, and low-molecular siloxane oligomers are fixed in the side surfaces of the fine pores and water inside the plate or in the atmosphere. It undergoes a hydrolysis reaction with the components to polymerize and exhibits the water repellency peculiar to silicon. This situation is shown in FIG. 1 as a schematic diagram. The water that tries to enter the hole portion 1 tries to permeate in a capillarity manner, but is blocked by the water generation of the silicon component of the aqua seal 2.

Next, an isocyanate-based moisture-curable urethane resin will be considered. This coating agent is also impregnated into the porous material of the plate material and undergoes a urethane reaction with water in the atmosphere or in the plate material to cure, but this resin has the property of filling the gaps in the plate material and strengthens the impregnated part. To do. Theoretically, the porous material of the ceramic plate material may be shown as shown in Fig. 1, but in reality, in the small 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 together with connectivity. In fact, since the vibration and heat are applied to the small edge due to the impact of the blade, the cement hydrate and the fibers that are connected lose their connectivity. Therefore, the property that the moisture-curable urethane resin is filled into the gap and cured serves to strengthen the surface layer of the base material and also serve as an anchor for the coating material applied to the upper layer.

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

From a general point of view, since it is appropriate to apply the aqua seal first, first, in order to observe the degree of impregnation, about 1% of toner is dispersed in the aqua seal to give a pink color. Colored. It was applied by brush with a brush so that it would not be colored. Each coating amount was limited to about 180 g when converted per m ² . The reason why the brush coating is performed is for convenience in putting the aqua seal in a predetermined container, measuring the weight, measuring the remaining amount after coating, and setting the difference amount as the coating amount. Further, V-Seran # 100 was similarly applied on the upper portion thereof by brush so that stickiness did not occur on the surface. The coating amount at this time was limited to 150 g. On the contrary, when the coating amount of the aqua seal increases due to the property of the edge, the amount of V-Seran # 100 decreases. this is,
It is presumed that this is because the water seal of the aqua seal works.
The tests shown in Tables 2 and 3 were conducted to know the appropriate coating amount. First apply aqua seal and then V-Seran #
After 100 hours and 24 hours later, the ENBI-based paint is applied and 2 mm
Was cut with a cutter and subjected to a peeling test with cellophane tape.

[0017]

[Table 2]

[0018]

[Table 3]

When the results shown in Tables 2 and 3 were evaluated, when the ceramic sheet material was overcoated with Aquaseal and V-Celan # 100, the effect of the aquaseal strongly appeared. In other words, the watering effect of the silicon component begins to appear,
There is a tendency to hinder the impregnation of 0. V Seran # 100
This is the reason why the adhesion cannot be obtained when the value is 160 g or more. Further, when the aqua seal exceeds 160 g, it comes to be projected on the surface of the plate material and cannot receive the substance 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 application amount of each is substantially equal. However, in order to make such a method of applying the coating twice at the work site, it is affected by the variation of the property of the small edge of the plate material and the aqua seal applied first, and therefore the amount of V-Seran # 100 applied later. It is difficult to judge and it is judged to be inappropriate.

Therefore, the present inventors presumed that even if a predetermined amount of a mixture of a siloxane oligomer and a moisture-curable urethane resin was applied, the same effect as repeated coating could be expected, and the following tests were conducted. . That is, aqua seal as a siloxane oligomer and V-Celan # 100 as a moisture-curing urethane resin were prepared, and V-Celan # 100 was added to the aqua-seal at a weight ratio of 5%, 10%, 8%.
A 0%, 90%, 100%, and 110% additive-mixed solution was prepared, and the adequacy of the coating amount on the edge and the adhesion with the overcoat layer were evaluated. As the top coat layer, the coating of Enbi-based paint V Seran # 200 (110 g / m ^{2) was} applied, dried and then cut into 2 mm scoring to evaluate the adhesion, and the results are shown in Table 4. It can be seen that the range of coating amount is much wider than in the case of multiple coating. This means that even if there are variations in the painting work at the work site, it is possible to provide a highly safe plate material.

[0021]

[Table 4]

Based on the above results, Table 5 shows the results of the water absorption test and the adhesion test of the small edge using the test piece with the central coating amount. 1 special cement extruded material with a thickness of 16 mm
Cut into 5 cm x 15 cm with a circular saw and paint one edge under the conditions shown in Table 5, and the other edge and front and back surfaces were completely covered with paraffin-based encapsulant. To 2
It was immersed for 4 hours, the water absorption was measured, and then the adhesion of the coating film was measured. It was found that the adhesion of the coating film was poor only with Aquaseal, and the water absorption was poorer with VSeran # 100 alone than that with Aquaseal. The coated surfaces of these test pieces were opposed to each other at an interval of 10 mm, and the space was filled with a silicone-based sealing material and left for 1 month, and then a force was applied to separate them. Peeling did not occur.

[0023]

[Table 5]

[0024]

As described above, according to the present invention, a moisture-curable urethane resin of isocyanate type is mixed with a siloxane oligomer of a penetrating water-absorption preventing agent of silicone type to prepare a resin composition. By applying on the small edge,
Overcoating is not required, and each characteristic is exhibited individually, and a protective layer with a high degree of adhesion that is stable and can cope with variations in the forefront properties can be obtained.

Also, with respect to the health problem due to coating such as spraying in the case of the isocyanate type moisture-curable urethane resin alone, the mixture can be applied by hand roll, which is convenient for safety and hygiene.

[Brief description of 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 cut small edge of a ceramics plate material.

[Explanation of symbols]

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

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location C09K 3/18 104

Claims (2)

[Claims] 1. A coating composition obtained by adding 10 to 100% by weight (% by weight) of an isocyanate moisture-curable urethane resin to a siloxane oligomer, which is a silicone-based penetrating water-absorption-preventing material, and mixing the coating composition on the small surface of a ceramic plate material. After forming a waterproof layer by impregnating it with water, a paint such as vinyl chloride resin, acrylic resin, or acrylic urethane resin is further applied on the waterproof layer to form a protective layer. Processing method. 2. A coating composition obtained by adding and mixing 10 to 100 (% by weight) of an isocyanate-based moisture-curable urethane resin to a siloxane oligomer which is a silicone-based penetrating water absorption preventing material.