JPH02175103A - Manufacture of inorganic decorative laminate sheet - Google Patents

Abstract

PURPOSE:To prevent a coated surface from getting stripping off, cracks and peeling off by using a coating material blended with an additive selected from a specific group with acryl emulsion as an emulsion coating material to be coated on the surface of a slurry-like extracted material. CONSTITUTION:Slurry composed mainly of a hydraulic inorganic bonding material is extracted on a felt by a cylinder box, and an emulsion coating material is applied on the surface of a composed slurry-like extracted material, which is then dehydrated by a suction, wound around a making rool to adjust the sheet thickness, and a formed extracted material is cured to manufacture continuously inorganic decorative sheets. At that time, a coating material consisting of acryl emulsion blended with at least one kind of additive selected from the group of higher fatty acid, higher fatty acid amide, bis-higher fatty acid amide and sorbitan fatty ester is used. Thus, as the additive exists between coating material resin particles and pigment particles to prevent the particles from adhering, and also exists on the surface of a fill to prevent the particles from adhering to a making roll, stripping off, cracks, peeling off and the like on the surface are eliminated even if dehydration force of a suction box is weakened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a paint for inorganic decorative laminates used in manufacturing inorganic decorative laminates used as building materials and the like.

[Conventional technology]

An inorganic board using a hydraulic inorganic binder such as cement or calcium silicate is produced by, for example, making a slurry mainly composed of a hydraulic inorganic binder onto a felt using a wet paper making machine called a cylinder box. As is well known, it is manufactured by sucking and dewatering the generated 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 painted surface, so when it is removed, some of the paint film may remain attached to the making roll or stick to the surface, causing the painted surface to deteriorate. Turn over,
It has the disadvantage of causing problems such as cracking and peeling.

In order to solve these drawbacks, conventional approaches include (1) applying an emulsion paint with a high mixing ratio of pigments at a low viscosity, and (2) applying an emulsion paint containing a hydrocarbon-based high-boiling solvent, paraffin, silicone oil, etc. Methods such as coating the slurry-like paper product were used to (1) reduce the contact area between the surface of the making roll and the surface of the slurry-like paper product, and 2) increase the sheet strength of the slurry-like paper product. However, it was not possible to prevent the slurry from adhering to the making roll unless the water content of the slurry-like paper product was significantly reduced. Therefore, there were drawbacks such as deterioration of the appearance of the coating film surface and powdery coating surface. In order to solve this problem, it is desirable to strengthen the effect of preventing adhesion to the making roll so that adhesion does not occur even if the dewatering force in the suction box is weakened.

[Problem to be solved by the invention]

Therefore, the present invention solves the above-mentioned problems of conventional inorganic decorative boards, and causes peeling, cracking, peeling, etc. of the painted surface due to part of the paint film remaining attached to the making roll or sticking. The purpose is to develop a method for manufacturing inorganic decorative laminates that does not cause problems.

[Means to solve the problem]

According to the present invention, a slurry containing a hydraulic inorganic binder as a main component is made on a felt in a cylinder box, an emulsion paint is applied to the surface of the resulting slurry-like paper product, and then water is dehydrated in a suction. When winding around a making roll to adjust the board thickness and curing and hardening the resulting plate-shaped paper product, in order to continuously manufacture inorganic decorative boards,
There is provided a method for producing an inorganic decorative board using, as the emulsion paint, a paint in which 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. Ru.

According to the present invention, a slurry containing a hydraulic inorganic binder as a main component is further formed on felt in a cylinder box, an emulsion paint is applied to the surface of the resulting slurry-like paper product, and then water is dehydrated in a suction. When the inorganic decorative board is continuously produced by winding it around a making roll to adjust the board thickness and curing and curing the resulting plate-like paper product, the emulsion paint is an acrylic emulsion containing a higher fatty acid and a higher fatty acid. At least one additive selected from the group of amides, bis-higher fatty acid amides, and zorbitan fatty acid esters; a hydrocarbon high-boiling solvent with a boiling point of 130° C. or higher and a dielectric constant of 10 or lower; paraffin and silicone oil; A method of manufacturing an inorganic decorative board using at least one additive is provided.

The first additives blended into the emulsion paint used to produce the inorganic decorative board in the present invention are, 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: These include bis-higher fatty acid amides such as bis-oleic acid amide, and zorbitan fatty acid esters such as zorbitan monooleate.

By blending such additives into emulsion paints for manufacturing inorganic decorative boards, the additives can exist between the paint resin particles and pigment particles to prevent the particles from sticking, or exist on the surface of the coating film to prevent the particles from sticking together. 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 material will not become powdery. You can get a decorative board.

These first additives are blended in an amount of 0.1 to 300 parts by weight, preferably 1 to 10 parts by weight, per 100 parts by weight of the emulsion paint for producing inorganic decorative laminates. If the amount of these additives is too small, the coating film will adhere to the making roll, and 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 that is blended together with the first additive in the emulsion paint for producing inorganic decorative laminates has a boiling point of 130°C or higher and a dielectric constant of 1.
Examples include at least one selected from the group of high boiling point solvents of 0 or less, paraffin and silicone oils.

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 or reduce the stability of the emulsion, and if the dielectric constant exceeds 10, the effect of preventing adhesion to the making roll will not be sufficient. This is not desirable because it is not fully utilized.

On the other hand, examples of paraffins include hydrocarbons obtained by distilling high-boiling fractions of petroleum.

Furthermore, examples of the silicone oil include straight 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 the first additive 1
00 parts by weight or less, preferably 2000 parts by weight or less, preferably 2
000 parts by weight or less. 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 blended in an amount of 0.1 to 300 parts by weight, preferably 1 to 20 parts by weight, per 100 parts by weight of the emulsion paint for producing inorganic decorative laminates. If the amount of these additives is too small, it will cause adhesion to the making roll, whereas if it is too large, the film-thickening properties will be lowered and the coating will become powdery, which is not preferable.

To briefly explain the method for manufacturing inorganic decorative laminates using the emulsion paint for manufacturing inorganic decorative laminates of the present invention, first, as the raw material hydraulic inorganic binder, cement,
Compounds of calcium silicate, blast furnace slag calcium aluminate monosulfate hydrate, gypsum, etc. can be used. If necessary, such a hydraulic inorganic binder is made into a slurry by further using reinforcing fibers and the like, and this is formed onto felt using a wet machine to form a slurry-like paper film.

An emulsion paint for producing an inorganic decorative board is applied to the slurry-like paper product formed on the felt in this manner. This paint is, for example, a conventional general acrylic emulsion paint mixed with the above-described first additive or the first additive and the second additive in predetermined amounts. Conventional general acrylic emulsion paint is JIS-5663
It is a paint for the interior and exterior of buildings as specified in 2013, and the constituent raw materials are acrylic resin, cellulose-based protective colloid, color pigments, extender pigments, other additives, and surfactants as necessary. Refers to a paint made of a suitable mixture of agents, etc.

There is no particular limit to the amount of the emulsion paint for producing inorganic decorative laminates applied onto the slurry-like paper structure, but generally 1.
A range of 0 to 200 g/rn'' is suitable.

A slurry-like paper product coated with an emulsion paint for producing an inorganic decorative board 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 by suction from below the felt in accordance with a conventional method, and then wound around a making roll to adjust the board 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.

〔Effect of the invention〕

According to the present invention, the appearance of the coating film surface is good and powder-free,
To easily and inexpensively produce an inorganic decorative board with excellent coating film adhesion and further excellent waterproofness and efflorescence resistance without reducing its strength.

〔Example〕

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 defined in JIS-A-5418.

Slurry composition component Weight part stone
Cotton 20 Coal material and siliceous material 80 Water Appropriate amount The slurry of the above composition was made into felt, and the resulting slurry-like paper body (dimensions: 35 cm width x O, 3 mm thick endless shape) is shown in Table 1 below. An acrylic emulsion paint of the composition was applied at a coverage of 100 g/l m'.

After applying the acrylic emulsion paint using a flow coater, it was dehydrated using suction (conditions: temperature 25°C, suction pressure 0.3 to 1.0 atm) and rolled to a plate thickness of 5 mm using a making roll (steel 40 cmφ x 50 cm). After manufacturing plate-shaped paper bodies, stacking the plate-shaped paper bodies by inserting a bottom plate every three sheets, sealingly pack them with a polyethylene sheet and store them at room temperature for 3 years.
It was left for a week 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:
Abrasion resistance according to JIS-A-6910-6-3-2 (1): According to JIS-A-6909-5-4 Appearance: Judgment with the naked eye Efflorescence resistance: A test piece cut into 1QXIQcm was placed in a refrigerator at 5°C. Leave it alone, drop 1~2cc of distilled water onto the surface (painted surface) once a day, and repeat this 3 times.
Observe the traces of evaporation of distilled water and evaluate the presence or absence of efflorescence.Releasability from the making roll: The suction pressure of the xenon box required to prevent the coating film from adhering to the making roll.

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, and no efflorescence was observed, and they also had excellent efflorescence resistance. Furthermore, the adhesion, abrasion resistance, and appearance were excellent, and there was no problem of adhesion to the making roll.

hand Continued Supplementary Positive book August 1999 tJ- Day

Claims (1)

[Claims] 1. A slurry containing a hydraulic inorganic binder as a main component is made onto felt in a cylinder box, an emulsion paint is applied to the surface of the resulting slurry-like paper product, and then water is dehydrated by suction. When the inorganic decorative board is continuously produced by winding it around a making roll to adjust the board thickness and curing and curing the resulting plate-like paper product, the emulsion paint is added to an acrylic emulsion with a higher fatty acid and a higher fatty acid. A method for producing an inorganic decorative board, comprising using a paint containing at least one additive selected from the group of amides, bis-higher fatty acid amides, and zorbitan fatty acid esters. 2. A slurry whose main component is a hydraulic inorganic binder is made onto felt in a cylinder box, an emulsion paint is applied to the surface of the resulting slurry-like paper product, then dehydrated with suction, and rolled onto a making roll. When continuously manufacturing an inorganic decorative board by applying and adjusting the board thickness and curing and curing the produced plate-like paper product, the emulsion paint is a higher fatty acid, a higher fatty acid amide, a bis-higher fatty acid amide, and an acrylic emulsion. and at least one additive selected from the group of sorbitan fatty acid esters, and at least one additive selected from the group of hydrocarbon high boiling point solvents with a boiling point of 130° C. or higher and a dielectric constant of 10 or lower, paraffin, and silicone oil. A method for manufacturing an inorganic decorative board, characterized by using a paint containing the following.