JPS62105982A - Manufacture of inorganic dressing 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] 1. The present invention relates to a method for manufacturing an inorganic decorative board, and particularly relates to a method for manufacturing an inorganic decorative board that is lightweight and has excellent processability and coating performance. It's Rurano.

Traditionally, as an inorganic decorative board used for interior decoration + 41 partition materials, ceiling boards, etc., an inorganic paint that does not deteriorate over time is applied to the surface of a cement-based binding material. Noni is known to have a coating formed on it. This type of inorganic decorative board has excellent non-combustibility, chemical resistance, water resistance, and . It is difficult to perform cutting and machining, and the on-site ζ must be
± Cutting process 1: It takes 16 hours to cut and cut.

Moreover, since the peripheral ridge part is chipped when the cutting load is applied, it is necessary to cover the end part from the surface, and the range of application is limited from a practical standpoint and a design standpoint.

On the other hand, in order to improve workability (1-2) and to make it lighter (A)
Attempts are being made to use porous, low-density material as the base material.

However, when applying an inorganic paint to this kind of inorganic mass (4), there was a problem that the paint was absorbed so much that it was impossible to form a good coating film. To eliminate .1, JP-A-55-5178
No. 0 discloses undercoating with an aqueous solution of sodium silicate. Above) According to the j method, it is certainly 1′,
The inhalation of Yuri paint has the effect of preventing insects, but
Experiments conducted by the present inventors have shown that this decorative board produces a high rank in a boiling water resistance test. The reason for this is thought to be that the adhesion between lithium silicate and the inorganic base material is low.

On the other hand, when a sodium silicate or potassium silicate aqueous solution having high adhesiveness is used, there is a problem that chemical resistance and efflorescence resistance are poor.

Structure of the Invention In view of the above-mentioned problems, the present inventor conducted intensive research on reducing the weight of inorganic decorative laminates, improving processability, and improving coating film performance. By using a cement board, using an inorganic paint mainly composed of alkali metal silicate, and finding the optimal conditions for the pretreatment of the inorganic base material and the coating method, we have created a coating that is lightweight, has excellent workability, and has a good coating film. We have completed a method for manufacturing inorganic decorative boards with high performance.

That is, the gist of the present invention is that after exposing a pulp-containing asbestos cement board with a specific gravity of 1.6 to 1.9 to hot air of 100°C or higher,
The surface temperature is maintained at 60℃ or higher, and an inorganic paint mainly composed of alkali metal silicate is applied to the bulb-containing stone.
1. An inorganic decorative board characterized in that it is coated on the surface of a cement board in layers of 50 to 150 g/m" (dry weight) to a final weight of 150 to 300 g/m2 (dry iridescence) and then heat-cured. It's in the manufacturing method.

Examples of the inorganic base material in the present invention include cement, cyto50 and
Add 3 to 30% by weight of IO to 10 to 30% by weight of asbestos to give the kneaded product lubricity. 2 to 15 admixtures
In addition to the weight percentage, a plate formed to have a specific gravity of 1.6 to 1.9 can be used.

The reason why the valve m is 3% by weight to 10% by weight is 3% by weight.
If it is less than loffl%, it will be difficult to achieve weight reduction and improve workability, and if it exceeds loffl%, it will be difficult to obtain the desired fire retardancy and coating performance.

As the inorganic paint mainly composed of alkali metal silicate in the method of the present invention, known inorganic paint compositions can be used. This type of inorganic paint is usually
10-35% by weight of inorganic binder, 40% or less of hardener, 25-90% of pigment and/or filler on a dry basis
A heavy crushing percentage should be used.

As the inorganic binder, water-soluble alkali metal silicate compounds such as sodium silicate, potassium silicate, lithium silicate, and modified products thereof may be used.

Hardening agents are added to impart water resistance, and are usually oxides of divalent metals such as zinc oxide, ortho and condensed phosphates, borates, etc. of polyvalent metals such as carunium and aluminum. Used alone, mixed or fired.

Pigments are added to color the paint film, and fillers are added to balance the composition of the paint and prevent foaming, cracking, etc. However, from the viewpoint of paint stability 1 workability, they are added to the binder components at room temperature. It is difficult to react, and it is particularly preferable that it does not react substantially. As pigments, for example, transition metal oxides such as chromium oxide, iron oxide, titanium oxide, and manganese dioxide, or composite oxides containing transition metals are often used, and as fillers, for example, alumina, quartz, zirconia, Zircon, mullite glass powder, etc. are often used.

If these constituents deviate from the above ratios, it is usually a problem to obtain a good coating film.

Inorganic paints are processed using ball mills, attritors, vibration mills, pomodinizers, and colloid mills.

Although it is prepared by mixing and dispersing with a stirrer or the like, it is preferable that it is dispersed as uniformly as possible, and the presence of coarse particles or coarse gels often causes non-uniformity. Preferably, it is necessary that particles of 20 μm or more are substantially free of (r), and if possible, measures such as removing aggregated particles with a sieve are added. The viscosity of the paint is about 400 to 20 μm.
A range of 0.00 cp and above is preferred. In addition, it is possible to use an hli auxiliary agent such as a thickener 1/1 thickener in the T material, and sodium alginate or the like is effective as a thickener.

When applying the inorganic paint to the inorganic group +4,
As a pretreatment, the inorganic base material is exposed to hot air at 100° C. or higher.

The purpose of this pretreatment is to effectively remove sludge from the kneaded bulbs, etc., and to store heat in the base material to prevent rapid cooling.

Note that the step of removing deposits on the surface of the base material is also performed after heating.

The application method is to spray 80 to 250 g of the above inorganic paint with a solid content of approximately 50 to 70% by weight onto the surface of an inorganic base material whose surface temperature is maintained at 60°C or higher after pretreatment.
m! (wet weight) in multiple doses.

The purpose of applying inorganic paint while maintaining the surface temperature of the inorganic base material at 60°C or higher is mainly to minimize the absorption of the solvent of the inorganic paint that has fallen onto the surface of the inorganic base material, and also to prevent the paint from reaching the surface of the inorganic base material. This is to improve familiarity.

If the temperature is lower than 60°C, the inorganic paint will be sucked in to a large extent, making it impossible to form a uniform coating film.

In addition, the reason why inorganic paint is applied multiple times is to apply it thinly and promote the scattering of the solvent, thereby preventing the formation of crater-shaped pores due to the release of the solvent after film formation. It's a good thing.

The desired coating performance can be obtained by controlling the final coated nail to be 150 to 300 g (dry weight).

Heat curing is performed by heating the coated inorganic material at 270°C in a heating furnace whose temperature is gradually increased from an inlet temperature of around 100°C.
This is done by holding the above for a certain period of time.

In addition, when it is desired to obtain gloss on the surface or to improve the smoothness of the surface, an alkali metal silicate or the like that does not contain a filler such as alumina may be applied as a top coat.

Example 1 50 parts by weight of No. 3 water glass, 5 parts by weight of aluminum phosphate, 5 parts by weight of zinc oxide, 7.5 parts by weight of titanium oxide, 5 parts by weight of titanium yellow pigment, 12.5 parts by weight of quartz powder (2 μm) and 15 parts by weight of water were mixed in a ball mill for 30 minutes,
Then, about 60 solid particles were passed through a 200 mesh sieve.
% and a viscosity of 850 cp was prepared.

Furthermore, according to the grind gauge, 20 μm is contained in this paint.
Almost no particles were observed.

Separately, an inorganic base material made of bulb-containing asbestos cement with a specific gravity of 1.8 was prepared, and after holding it in an oven at 180°C for 10 minutes, the deposits on the surface of the base material were removed, and it was heated at room temperature for 5 minutes. Leave to cool for a minute until the surface temperature of the base material is 70~70℃.
When the temperature reached 80°C, apply the above paint to a diameter of 2.5 m.
Apply 2 coats of 150g/+++” (wet weight) using an mφ air spray gun, totaling 300g/m2 (wet weight).
The coating was coated over and over again, and heated in a heating oven at 270°C for 10 minutes to cure. In addition, the heating furnace has an inlet temperature of 10
The temperature was set at 0°C and the temperature was set to gradually increase to higher temperatures.

Comparative Example 1 The surface temperature of the same inorganic base material as in Example 1 was set to 50°C, and the same operations as in Example 1 were performed thereafter to obtain a sample.

+4. Super F1 (invention described in JP-A No. 55-51780) Example I
After heating the same inorganic base 100 to 130°C, a lithium silicate aqueous solution (solid content 2.2
%, SiO,/Li, O=4.5) at a rate of 60 g/m', and then the same operations as in Example 1 were performed to obtain a sample.

Comparative Example 3 A sample was obtained by carrying out the same operation as in Example 1, except that asbestos slate (J ISA 5403) with a specific gravity of 1.8 without bulbs mixed in the inorganic base material was used.

Comparative Example 4 A sample was obtained by performing the same operation as in Example I except that an asbestos cement calcium silicate plate (JI SAS 5418) having a specific gravity of 1.2 was used as the inorganic base material.

Comparative Example 5 A commercially available inorganic decorative board (product name Toshi Grasal) was used as a sample.

Specific gravity, coating state, hardness, stain resistance, chemical resistance, cutting performance, and boiling water resistance of each sample obtained as described above were observed and measured. The results are shown in Table 1.

Table 1 shows the machinability observed by checking whether there are any chips at the peripheral ridge when cutting with a hand deep saw.

Boiling water resistance indicates the case where the surface of the coating film was observed with a magnifying glass (magnification: 30) after being immersed in boiling water for 45 minutes.

As is clear from Table 1, the specific gravity of Example 1, which is an inorganic decorative board according to the present invention, is lower than the specific gravity of Comparative Example 5, which is a commercially available inorganic decorative board, and is lighter.

In addition, Example 1 does not cause cracks that can be seen with the naked eye as in Comparative Examples 1 and 3.4, has good aesthetics, and is a commercially available inorganic decorative board in terms of hardness, stain resistance, and chemical resistance. It shows the same characteristics as Comparative Example 5.

Further, it can be seen that Example 1, like Comparative Example 2, did not show any cracks in the boiling water resistance test and exhibited excellent coating film performance.

Furthermore, when cut with a hand-tip saw, Comparative Example 5, which is a commercially available inorganic decorative board, had a chip of about 1 to 3 mm on its peripheral ridge; however, Example 1, which is an inorganic decorative board according to the present invention, Since no chipping occurred, it can be seen that Example 1 has better machinability than Comparative Example 5.

Effects of the Invention As described above, according to the detailed method of the present invention, the specific gravity is 1.6 to 1.
The inorganic base material made of pulp-mixed asbestos cement board of No. 9 is
Since the pulp portion has a lower specific gravity and toughness than other mixtures, it is possible to reduce the weight and improve impact resistance and machinability. Therefore, during cutting, no chipping occurs on the peripheral edges, and workability in on-site construction is significantly improved, making it possible to expand the range of uses.

Moreover, according to the method of the present invention, since the inorganic parts other than the pulp are densely formed, the amount of paint absorbed is small, and a uniform and good coating film is easily formed on the surface of the base material.

Furthermore, after heating to 100℃ or higher in advance, 60℃
Since the paint is then coated in a steep and slanted manner, temperature unevenness and rapid temperature drops are reduced, and the paint can be applied evenly to the base material. Therefore, a uniform coating film is formed, and there are no crater-like holes or cracks that can be seen with the naked eye.

Claims (1)

[Claims] (1) After exposing a pulp-containing asbestos cement board with a specific gravity of 1.6 to 1.9 to hot air of 100°C or higher, its surface temperature was lowered to 60°C.
℃ or higher, and an inorganic paint mainly composed of alkali metal silicate was applied to the surface of the pulp-mixed asbestos cement board for 50℃.
~150g/m^2 (dry weight) each, final 150~3
Apply multiple coats to achieve a dry weight of 00g/m^2 (dry weight).
A method for producing an inorganic decorative board characterized by heat curing.