JPS588604A - Manufacture of inorganic decorative board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for 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, making a slurry mainly composed of a hydraulic inorganic binder onto a felt using a wet paper making machine called a cylinder box. The resulting slurry-like paper product is absorbed and dehydrated using a suitable sacrificial cloth, and then subjected to Making 1.
As is well known, it is manufactured by winding the sheet into a coil, adjusting the sheet thickness, and curing and hardening the obtained plate-shaped paper product. However, such an inorganic board,
It is difficult to adjust the color of the surface because the curing state varies, and because it is porous, it has a high water absorption rate.
When used as an exterior material for housing, it is necessary to improve waterproofness, and it also has drawbacks such as efflorescence, which deteriorates in appearance due to internal alkaline substances migrating to the surface of the board over time. .

Therefore, in order to solve such drawbacks, conventionally, for example,
Methods that have been used include (1) applying an emulsion paint to a plate-shaped excipient and then curing and curing it, and (2) applying various coating compositions to a dry inorganic cured substrate.

However, these methods have drawbacks such as poor adhesion of the coating film and excessive cost for makeup, and are still unsatisfactory.

Therefore, an attempt was made to apply emulsion paint in front of the making roll, but since the surface wrapped around the making roll becomes the painted surface, when the making roll is removed, a part of the paint film may remain attached to the making roll or become sticky. This caused problems such as peeling, cracking, and peeling of the painted surface, and it was not put into practical use.

The present inventors have conducted a series of studies to solve the problems of the conventional inorganic boards mentioned above and to develop a method for producing inorganic decorative boards with excellent quality. , an emulsion paint made by adding specific additives to a general emulsion paint is applied to a slurry-like paper product made by applying a slurry mainly composed of a hydraulic inorganic binder onto a felt using a wet machine, and then The surface hue can be adjusted by dehydrating it with a saccharine, winding it around a making roll, adjusting the thickness, and curing the resulting plate-shaped paper product, which allows for excellent adhesion of the coating film. The inventors have discovered that it is possible to produce an inorganic decorative board that is excellent in water resistance, water resistance, and resistance to effluent resistance, and has completed this invention.

That is, according to the present invention, 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 a saccharide is made. In order to produce an inorganic decorative board 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 has a boiling point of 150°C or higher and a dielectric constant of 1.
Provided is a method for producing an inorganic decorative board, which comprises blending at least one additive selected from the group of a hydrocarbon high boiling point solvent of 0 or less, paraffin, and silicone oil.

Further, this invention will be explained in detail.

Examples of the hydraulic inorganic binder used in this invention include cement, calcium silicate, blast furnace slag, calcium aluminate monoral phosphate hydrate, and a mixture of gypsum. If necessary, such a hydraulic inorganic binder is made into a slurry by using a reinforcing material, etc., and this is formed onto felt using a wet machine to form a slurry-like paper film.

An emulsion paint is applied to the slurry IJ-shaped paper product formed on the felt in this manner. The emulsion paint used in the present invention is a conventional general emulsion paint mixed with at least one additive selected from the group of a high boiling point solvent with a boiling point of 150° C. or more and a dielectric constant of 10 or less, paraffin, and silicone oil. It is something. Conventional general emulsion paint is JI8-566
It is a paint for the interior and exterior of buildings as specified in 3.
The constituent raw materials are resins such as acrylic and vinyl acetate, and if necessary, a coating consisting of a cellulose-based protective colloid, coloring pigments, extender pigments, and other additives and surfactants. means.

In the present invention, examples of high boiling point solvents to be added to emulsion paints as additives include kerosene (kerosene), turpentine oil, petroleum naphtha, xylene, etc., and these may be used alone or in a mixture of two or more. Good too.

In the present invention, examples of the paraffin blended as an additive in the emulsion paint include hydrocarbons obtained by distilling high-boiling fractions of petroleum.

Examples of the silicone oil to be blended as an additive in the emulsion paint in the present invention include linear silicone oil, methylphenyl silicone oil, and organically modified silicone oils thereof.

These additives are preferably 100 parts by weight or less, preferably 0.5 to 100 parts by weight, more preferably [7 or 20 to 6 parts by weight] per 100 parts by weight of the emulsion eye paint in the emulgene paint.
0 parts by weight is blended. If the amount of this additive is too large, it will be difficult to obtain a uniform coating, and if the amount is too small, the coating will adhere to the making roll, which is not preferable. Further, when applying the emulsion paint, it is preferable to apply the paint while stirring the paint.

As mentioned above, additives that are blended into the Emulgene paint to prevent the Emulgene paint from attaching to the making roll have a boiling point of 130°C or higher, preferably 150°C or higher.
Hydrocarbon-based high-boiling solvents having a dielectric constant of 10 or less, preferably 5 or less at temperatures above 100°C, and silicone oils and paraffins that can be used in combination with or separately from these to prevent paint from directly adhering to the making wheel. 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 seal, and if the dielectric constant exceeds 10, it will not be effective in preventing adhesion to the making roll. This is a desirable prisoner because his abilities are not fully demonstrated.

There is no particular limit to the amount of emulgene paint applied to the slurry-like paper structure in the present invention, but generally 10 to 20
A range of 0 f/xi is appropriate.

The slurry-like paper product coated with the emulsion paint according to the present invention is manufactured into a product through dehydration, plate thickness adjustment, curing, and curing steps in exactly the same manner as in the conventional method. That is, a slurry-like paper product on felt coated with the emulsion paint according to the present invention as described above is dehydrated from the bottom of the felt using a saccharifier according to a conventional method, and then wound around a making roll to adjust the board thickness. do. The sheet is wrapped around a making roll until it reaches a certain thickness, then the sheet is removed to create a plate-like paper product. If necessary, it is pressed to shape it, then cured, and if necessary, dried. ,
Manufacture an inorganic cured substrate. In this way, it is possible to easily produce an inorganic decorative board with adjustable surface hue, excellent coating film adhesion, and excellent waterproof and efflorescence resistance without reducing its strength.

As described above, this invention applies an emulsion paint containing a synthetic resin aqueous emulsion to a slurry-like paper product on a felt, then dehydrates it by suction from under the felt in a saccharging tank, and then uses a making roll to form a board with a constant thickness. In order to cure and cure the sheet-like paper product, an emulsion paint containing a synthetic resin aqueous emulsion penetrates deep into the surface layer of the sheet-like paper product.

Furthermore, as the hydraulic inorganic binder hardens in that state,
An inorganic decorative board can be manufactured in a state where the surface layer of the inorganic board and the emulsion paint are mixed. Therefore, an inorganic decorative board with excellent coating film adhesion, waterproof properties, and efflorescence resistance can be obtained.

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.

[Example 1] An inorganic decorative board was manufactured using a slurry containing a general corrugated plate having the following composition defined in JIS-A-5418.

Asbestos 20
Calcareous raw material old friend and silicic acid raw material 80 water
A suitable amount of the slurry having the above composition was made into felt, and the resulting slurry-like paper product (dimensions: 5
5m width x 13. Acrylic emulsion paint with the following composition (viscosity: #4 Ford cup = 40
sec) at a coverage of 1001/1.

Water 11 Dispersant, film forming agent, antifoaming agent 5 Color pigment
17 Extender pigment 47 Acrylic emulsion resin 17 Kerosene (boiling point range: 175-525°C, dielectric constant 2.0-2.2) 5 total 100 After applying the acrylic emulsion paint with a flow coater, Dehydrated in a saccharine (conditions: temperature 25℃, suction pressure α5
~0.8 atm), making roll (steel 40c)
rnΦ Hardened.

The water permeability of the inorganic decorative board thus produced, F0
The presence or absence of reluctance, the degree of adhesion of the coating film, and the adhesion of the making roll were tested.

The results were as shown in Table 1 below.

[Example 2] Slurry-form paper was produced in the same manner as in Example 1, except that an Emulsilon paint with a viscosity of 20 seconds in which 1% by weight of liquid paraffin was mixed in place of kerosene was used in the same manner as in Example 1. A body was prepared and coated with an airless sprayer to produce an inorganic decorative board.

The results are shown in Table 1.

[Example 3] Example 3 except that in the method of Example 1, emulsilon paint containing 2% by weight of liquid paraffin mixed with kerosene instead of kerosene was used as an emulsion paint with a viscosity of 10 seconds. A paper body was produced using the same method as in 1, and painted using an Airmix (imported and sold product by Takubo Engineering @) coating machine to produce an inorganic decorative board.

The results are shown in Table 1.

[Comparative Example 1] An inorganic board was manufactured in the same manner as in Example 1 except that the Emulsilon paint was not applied.

The results are shown in Table 1.

[Comparative Example 2] After spraying the emulsion paint used in Example 1 (but not containing kerosene) at 200 F per 1 i with an airless spray onto the uncured sheet-shaped paper product produced by the method of Comparative Example 1. The material was cured and cured in the same manner as in Example 1 to produce an inorganic decorative board.

The results are shown in Table 1.

[Comparative Example 3] On the inorganic board produced by the method of Comparative Example 1, the emulsilon paint of Example 3 (but not containing kerosene and liquid paraffin) was sprayed at υ200v per liter using an airless spray.
It was dried in a hot air oven at 80°C for 20 minutes to produce an inorganic decorative board.

The results are shown in Table 1.

[Comparative Example 4] An inorganic decorative board was produced in the same manner as in Example 1 using the same emulsion paint as in Example 1 except that kerosene was not included as the emulsion paint.

Chapter 1 Table (Note 1) Based on JIS-Human-6910-6-4.

(Note 2) Leave the test piece cut at 10×10 mK in a refrigerator at 5° C., and drop 1 to 2 cc of distilled water onto the surface (painted surface) once a day.

After turning the mixture 3 times, the distilled water will evaporate. Observe the traces emitted and check the sense. The presence or absence of occurrence was evaluated.

@:3) Attach the four-piece with an epoxy adhesive when measuring water permeability according to JIS-A-6910-6-4. This is 1
Heat to 00℃ and remove. The degree of adhesion was evaluated based on the presence or absence of peeling of the coating film at this time.

In the method of Example 1, the part where the emulsion-free paint is applied is the method described in each example, but other than that, the same decision is made for each 5
A sheet of inorganic board was manufactured and the presence or absence of adhesion was evaluated by making.

As is clear from the results in Table 1, all of the inorganic decorative boards obtained in each example have low water permeability, are highly waterproof, and have no occurrence of ef-presence. , and had excellent efflorescence resistance. Furthermore, the adhesion was excellent and there were no problems with adhesion to the making chlorine.

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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 coating is applied to the surface of the resulting slurry-like paper product, and then In order to produce an inorganic decorative board by dehydrating it in a tube, winding it around a making wheel to adjust the board thickness, and curing and hardening the resulting board-shaped paper product, it was found that the emulsion paint had a boiling point of 130°C. A method for producing an inorganic decorative board, which comprises blending at least one additive selected from the group of a hydrocarbon high boiling point solvent having a dielectric constant of 10 or less at a temperature of 10° C. or higher, paraffin, and silicone oil. 2. The method according to claim 1, wherein the amount of the additive is 100 parts by weight or less per 100 parts by weight of the emulsion resin in the emulsion paint. The method according to claim 1 or 2, wherein the high boiling point solvent is at least one solvent selected from the group of kerosene, turpentine, petroleum naphtha, and xylene.