JPH0240697B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paint for an inorganic decorative board used in manufacturing an inorganic decorative board used as a building material or the like. An inorganic board using a hydraulic inorganic binder such as cement or calcium silicate is produced by, for example, forming a slurry mainly composed of a hydraulic inorganic binder onto felt using a wet paper making machine called a cylinder box. As is well known, it is manufactured by sucking and dewatering the resulting slurry-like paper product using an appropriate suction, winding it around a making roll to adjust the plate thickness, and curing and hardening the obtained plate-like paper product. It is. However, in this method of manufacturing inorganic decorative laminates, the surface wrapped around the making roll becomes the coated surface, so when it is removed, some of the coating film may remain on the making roll or become sticky. The drawback was that problems such as peeling, cracking, and peeling of the painted surface occurred. In order to solve these drawbacks, conventional methods have been to (1) apply emulsion paints with a high mixing ratio of pigments at low viscosity;
(2) A method of painting with an emulsion paint containing a hydrocarbon-based high-boiling solvent, paraffin, silicone oil, etc. has been used, but (1) this method reduces the contact area between the surface of the making roll and the surface of the slurry-like paper product. (2) In order to increase the sheet strength of the slurry-like paper product, the water content of the slurry-like paper product must be greatly reduced to prevent adhesion to the making roll. As a result, there were drawbacks such as deterioration in the appearance of the coating film surface and powdery coating surface. In order to solve this problem, it is desired to strengthen the effect of preventing adhesion to the making roll so that adhesion will not occur even if the dewatering force in the suction box is weakened. The present inventors have solved the problems of the conventional inorganic decorative board described above, and have solved the problem of peeling, cracking, and peeling of the painted surface due to part of the paint film remaining attached to the making roll or sticking. We conducted extensive research to develop a paint for inorganic decorative boards that does not cause these problems, and discovered that the above problems could be solved by incorporating specific additives into the paint. I've reached it. That is, according to the present invention, there is provided an inorganic decorative board coating comprising an acrylic emulsion and at least one additive selected from the group of higher aliphatic, higher fatty acid amide, bis higher fatty acid amide, and sorbitan fatty acid ester. is provided. According to the present invention, the acrylic emulsion is further provided with at least one additive selected from the group of higher fatty acids, higher fatty acid amides, bis-higher fatty acid amides, and sorbitan fatty acid esters, and a boiling point.
Provided is an inorganic decorative laminate paint containing at least one additive selected from the group of a hydrocarbon high boiling point solvent having a dielectric constant of 10 or less at 130° C. or higher, paraffin, and silicone oil. In the present invention, the first additives blended into the inorganic decorative board coating include, for example, higher fatty acids such as stearic acid and oleic acid; higher fatty acid amides such as stearic acid amide and oleic acid amide; bis-oleic acid amide, etc. and sorbitan fatty acid esters such as sorbitan monooleate. By blending such additives into the paint for inorganic decorative boards, the additives can exist between paint resin particles and pigment particles to prevent particles from sticking together, or can exist on the surface of the paint film to prevent adhesion to the making roll. Even if the dehydration power of the suction box is weakened, there will be no peeling, cracking, or peeling of the paint surface, and the appearance of the paint surface will be good and the inorganic makeup will not look powdery. You can get a board. The first of these additives is inorganic decorative board paint.
0.1 to 300 parts by weight per 100 parts by weight, preferably 1 to 300 parts by weight
Contains 10 parts by weight. If the amount of these additives is too small, the coating film will adhere to the making roll, whereas if it is too large, the film forming properties will be reduced and the coating film will become powdery, which is not preferable. In the present invention, the second additive to be blended together with the first additive in the inorganic decorative board paint includes a high boiling point solvent with a boiling point of 130°C or higher and a dielectric constant of 10 or lower, paraffin, and At least one selected from the group of silicone oils may be mentioned. Examples of the high boiling point solvent include kerosene (kerosene), turpentine oil, petroleum naphtha, and xylene. If the boiling point of the above-mentioned high boiling point solvent is less than 130°C, it is undesirable because it will cause the coating to form a skin and reduce the stability of the emulsion, and the dielectric constant will decrease.
If it exceeds 10, it is not preferable because the effect of preventing adhesion to the making roll will not be sufficiently exhibited.
On the other hand, examples of paraffins include hydrocarbons obtained by distilling high-boiling fractions of petroleum. Furthermore, examples of the silicone oil include linear silicone oil, methylphenyl silicone oil, and organically modified silicone oils thereof. When these second additives are used together with the first additive, they exist between paint resin particles and pigment particles, and the effect of preventing particles from sticking becomes stronger, and when the second additive is used alone. The effect of preventing adhesion to the making roll is significantly improved. These second additives are blended in an amount of 2000 parts by weight or less, preferably 2000 parts by weight or less, per 100 parts by weight of the first additive. If this amount is too large, the effect of preventing adhesion to the making roll will not be sufficiently exhibited, which is not preferable. The mixture of the first and second additives is 0.1 to 300 parts by weight, preferably 1 part by weight, per 100 parts by weight of the inorganic decorative laminate paint.
~20 parts by weight is blended. If the amount of these additives is too small, it will cause adhesion to the making roll, and if it is too large, the film-thickening properties will decrease and the coating will become powdery, which is not preferable. A brief explanation of the method for manufacturing inorganic decorative laminates using the inorganic decorative laminate paint of the present invention is as follows:
First, as the raw material hydraulic inorganic binder, a mixture of cement, calcium silicate, blast furnace slag, calcium aluminate monosulfate hydrate, gypsum, etc. can be used. Such a hydraulic inorganic binder is made into a slurry by further using reinforcing fibers, if necessary, and this is formed onto felt using a wet machine to form a slurry-like paper film. The inorganic decorative board coating material according to the present invention is applied to the slurry-like paper product formed on the felt in this manner. The paint of the present invention is, for example, a conventional general emulsion paint mixed with the above-described first additive or the first additive and the second additive in predetermined amounts. Conventional general emulsion paints are paints for the interior and exterior of buildings as specified in JIS-K-5663, and the constituent raw materials are resins such as acrylic and vinyl acetate, and if necessary, Cellulose-based protective colloids, color pigments and extender pigments,
Furthermore, it refers to paints that are appropriately blended with other additives, surfactants, etc. There is no particular restriction on the amount of the coating for inorganic decorative boards according to the present invention to be applied onto the slurry-like paper structure, but a range of 10 to 200 g/m ² is generally appropriate. The slurry-like paper product coated with the inorganic decorative board coating material according to the present invention is manufactured into a product through dehydration, board thickness adjustment, curing, and curing steps in exactly the same manner as in the conventional method. That is, the slurry-like paper product on the felt coated with the paint as described above is dehydrated from below the felt in a suction according to a conventional method, and then wound around a making roll to adjust the sheet thickness. The material is wound around a making roll until it reaches a certain thickness, and then removed to create a plate-like paper product. If necessary, it is pressed to shape it, then cured and hardened, and if necessary, dried to form an inorganic material. Manufacture a cured substrate. In this way, the appearance of the coating film surface is good and it is not powdery, and the adhesion of the coating film is excellent.
Furthermore, an inorganic decorative board with excellent waterproofness and efflorescence resistance can be easily and inexpensively produced without reducing its strength. EXAMPLES The present invention will be explained in more detail below using examples of the present invention together with comparative examples, but it goes without saying that the technical scope of the present invention is not limited to these examples. Examples 1 to 4 and Comparative Examples 1 to 3 Inorganic decorative boards were manufactured using a slurry containing a general corrugated plate having the following composition specified in JIS-A-5418. Slurry composition components ( parts by weight ) Asbestos 20 Calcareous raw materials and silicic raw materials 80 Water Appropriate amount The slurry with the above composition is made into felt, and the resulting slurry-like paper product (dimensions: 35 cm wide x 0.3 mm thick endless shape) is coated with the following material. An acrylic emulsion paint having the composition shown in Table 1 was coated at a coating weight of 100 g/m ² . After applying the acrylic emulsion paint using a flow coater, it was dehydrated using a suction machine (conditions:
At a temperature of 25°C and a suction pressure of 0.3 to 1.0 atm), plate-shaped paper bodies with a thickness of 6 mm were manufactured using a making roll (steel 40 cmφ x 50 cm), and the plate-shaped paper bodies were stacked by inserting a floor plate every three sheets. Thereafter, it was sealed and packaged with a polyethylene sheet and left at room temperature for 3 weeks to cure and harden. The waterproofness, adhesion, abrasion resistance, appearance, efflorescence resistance, and releasability from the making roll of the thus produced inorganic decorative board were measured by the methods described below. Waterproofness: Compliant with JIS-A-6910-6-4 Adhesion: Compliant with JIS-A-6910-6-3-2(1) Abrasion resistance: Compliant with JIS-A-6909-5-4 Appearance: Resistance determined by the naked eye Efflorescence property: A test piece cut into 10 x 10 cm was left in a refrigerator at 5°C, and 1 to 2 c.c.
Drop distilled water onto the surface (painted surface), repeat this 3 times, observe the traces of distilled water evaporation, and evaluate the occurrence of efflorescence.Releasability from the making roll: Apply to the making roll. Suction box suction pressure required to avoid membrane adhesion. The results were as shown in Table 1. As is clear from the results in Table 1, the inorganic decorative boards obtained in each example were all highly waterproof, did not show any occurrence of efflorescence, and had excellent efflorescence resistance. Ta. Furthermore, the adhesion, abrasion resistance, and appearance were excellent, and there was no problem of adhesion to the making roll. 【table】

Claims (1)

[Scope of Claims] 1. An inorganic decorative board characterized in that an acrylic emulsion is blended with at least one additive selected from the group of higher fatty acids, higher fatty acid amides, bis higher fatty acid amides, and sorbitan fatty acid esters. paint. 2 Add to the acrylic emulsion at least one additive selected from the group of higher fatty acids, higher fatty acid amides, bis higher fatty acid amides, and sorbitan fatty acid esters, and a boiling point of 130°C or higher and a dielectric constant.
1. A paint for inorganic decorative boards, characterized in that it contains at least one additive selected from the group of hydrocarbon high boiling point solvents of 10 or less, paraffin, and silicone oil.