JPS62123053A - Calcium silicate and manufacture - 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 [Industrial Field of Application] The present invention relates to a calcium silicate molded body and a method for producing the same.

More specifically, the present invention provides calcium silicate, reinforcing fibers, and latex, which are light and strong, have heat resistance, water resistance, and can be suitably used as building materials with workability similar to that of wood. and a calcium silicate molded body comprising a dispersant and a method for producing the same.

[Prior Art] Regarding the calcium silicate molded body, (1) 100 parts by weight of calcium silicate hydrate, 10 to 150 parts by weight of hydraulic gypsum, 5 to 30 parts by weight of polymer emulsion, and a flocculant for polymer emulsion. and water, and a calcium silicate molded product obtained by molding and drying an aqueous slurry consisting of reinforcing fibers (Japanese Unexamined Patent Publication No. 160428/1982), (2) Silicic acid in which glass fibers are dispersed in calcium silicate. Calcium molded bodies (JP-A-50-69121) and the like have been proposed.

[Problems to be solved by the invention] However, since the molded product of (1) contains a considerable amount of hydraulic gypsum, it not only has some difficulty in water resistance, but also has a tendency to be exposed to high temperatures. 800~ under reducing conditions
Gypsum decomposes at 1000°C, producing toxic sulfur oxides, and gypsum crystallization water is lost at 100 to 500°C, resulting in volume changes and strength reductions in molded products, which can lead to problems with safety, heat resistance, and dimensions. There are some drawbacks in terms of stability, etc. From the above, (1)
This method produces highly safe calcium silicate molding that is lightweight with a bulk specific gravity of 0.3 to 0.79/CTd, strong, heat resistant, water resistant, dimensional stability, etc., and has processability similar to that of wood. It is difficult to get the body.

In addition, the molded product of (2) above also has a bulk specific gravity of 0.3 to 0°7 g/
If it is as light as CTl1, problems will arise in strength, workability, etc.

An object of the present invention is to provide a calcium silicate molded body suitable for use as a building material such as synthetic wood, particularly a heat-resistant building material, which has improved these drawbacks, and a method for producing the same.

[Means and effects for solving the problems] The present invention has the following features:
100 parts of calcium silicate, 1 to 30 parts of reinforcing fiber, 1 to 40 parts by weight of latex, and 0.1 to 5 parts of dispersant.
The present invention relates to a calcium silicate molded body consisting of parts by weight and a method for producing the same.

In the calcium silicate molded article of the present invention, calcium silicate slurry, reinforcing fibers, latex, and dispersant are added to 100 fflfffi parts of calcium silicate to 1 to 1 reinforcing fibers.
30 parts by weight, 1 to 40 parts of latex and 0 parts of dispersant
．． It can be produced by mixing in a proportion of 1 to 5 parts by weight, molding, and then drying, and by specifying the composition ratio, especially by using a dispersant, the drawbacks of conventional calcium silicate molded bodies can be improved. I can do it.

In the present invention, the calcium silicate is a calcium silicate hydrate usually called tobermorite or xonotrite, which is obtained by a hydrothermal synthesis reaction from calcareous raw materials such as quicklime and slaked lime, silicic acid raw materials such as silica stone, and water. It is suitable and used as a calcium silicate slurry, specifically a calcium silicate hydrate aqueous slurry, in the production of calcium silicate molded bodies.

Reinforcing fibers include glass fiber, carbon fiber, etc.
N 8M m, nylon, polypropylene, rayon,
Organic fibers such as vinylon can be used, and these may be used alone or in combination of two or more. Reinforcing fibers have the effect of improving the strength and elastic modulus of the molded product, improving the retention of calcium silicate and latex in the slurry during production, and improving filtration separation during pressurized dehydration. From the viewpoint of properties, water resistance, heat resistance, etc., it is preferable to use 1 to 30 parts per 100 parts of calcium silicate, or 3 to 15 parts per 100 parts of calcium silicate.

The timing of mixing the reinforcing fibers is not particularly limited, but from the viewpoint of preventing damage to the reinforcing fibers due to mixing and improving the dispersibility of the reinforcing fibers, the reinforcing fibers are mixed after the calcium silicate slurry, latex, and dispersant are mixed. is preferable.

The latex may be either a solution type or an emulsion type, and specifically, styrene-butadiene copolymer,
Latexes such as acrylonitrile-butadiene copolymer, butadiene polymer, methyl methacrylate-butadiene copolymer, isoprene (co)polymer, and ethylene-propylene copolymer are mentioned.

The latex itself has the effect of fixing the calcium silicate itself and the calcium silicate and reinforcing fibers in the molded article. Therefore, the molded product exhibits high strength, no powder scattering during cutting, and exhibits excellent workability such as good holding power for nails and the like.

In order to further improve the fixing effect of the latex, it is possible to use a tackifier that improves the adhesive strength of ordinary rubber latex, such as coumaron or indene resin.

In addition, to improve the properties of the latex used, commonly used sulfur-based vulcanizing agents, non-sulfur vulcanizing agents (e.g., jepoxy compounds, blocked isocyanates, etc.) and fusing agents may also be used. By using these additives, it is possible to improve the surface hardness, elasticity, and nail holding power of the molded product.

The latex is used in an amount of 1 to 40 parts by weight, preferably 5 to 25 parts by weight, per 100 parts by weight of calcium silicate. If the amount of latex used is too small, processability will be difficult, and if it is too large, problems will arise in heat resistance.

As the dispersant, those known as cement dispersants (including water reducing agents) are preferably used. Specifically, lignin-based, higher polyhydric alcohol sulfonate-based,
Examples include oxyorganic acid systems, alkylaryl sulfonate and high condensate systems, polyoxyethylene alkyl ether systems, melamine condensate systems, β-naphthalene sulfonic acid formalin condensation, and the like. Inorganic salts such as sodium phosphate can also be used. The amount of the dispersant used varies slightly depending on the type of dispersant, but it is used in the range of 0.1 to 5 parts by weight, preferably 0.5 to 4 parts by weight, based on the calcium silicate. By using a dispersant, it is possible to uniformly disperse the 6 elements 1'E+ during the production of molded objects, resulting in a highly dispersed calcium silicate slurry, which prevents damage to reinforcing fibers, making it lightweight, strong, heat resistant, and water resistant. , good dimensional stability, etc., and workability similar to wood! 7! It is possible to create an unprecedented calcium silicate molded body with a high degree of safety. If the amount of dispersant used is too small, there will be problems with the processability, strength, etc. of the molded product, and if it is too large, it will not only not be smooth but also have difficulty in water resistance.

1) Preferred method for producing the calcium silicate molded article of the present invention
For example:

Calcareous raw materials and silicic acid raw materials are used so that the Si 02 /Ca O (molar ratio) is 1, and water is added at a ratio of 5 to 1 % to the raw materials.
Add 5 times the amount and carry out a hydrothermal synthesis reaction to obtain a calcium silicate slurry, specifically an aqueous slurry of calcium silicate hydrate. Autoclaves are generally used for hydrothermal synthesis reactions.

After a predetermined amount of latex and a dispersant are mixed into the calcium silicate slurry, reinforcing fibers are mixed thereinto and a slurry in which these are uniformly dispersed is formed. The slurry forming method is as follows:
For example, a method of filling a mold and dehydrating under pressure may be mentioned, but a conventionally known molding method may be adopted as appropriate depending on the purpose and use.

When the molded product is dried, the desired calcium silicate molded product can be obtained. The temperature for drying is not particularly determined, but it is 100-180'C, usually 110-160'C.
temperature is adopted.

Examples of the present invention are shown below.

(Example) The test results provided in the examples were based on the following method.

Bending strength: According to JISA1408.

Workability: Judgment was made by comparing with wood that has been subjected to wood processing operations such as planing, nailing, sawing, etc.

The heat-resistant two molded bodies were heated in a 1000'C electric furnace for 2 hours and then judged based on the presence or absence of toxic gas generation, strength, and dimensional stability.

Water resistance: Judgment was made from the strength and dimensional stability after the molded body was immersed in water at a water temperature of 20'C for 24 hours.

Example 1 Silica powder and slaked lime were mixed at a molar ratio of 5i02:CaO of 1:
Mix it so that it becomes 1, and determine which total type ω of CaO and SiO2.
Add 10 Fm of water to the autoclave and heat at 210°C and 19Kg/Cm of pressure in an autoclave with stirring.
The hydrothermal synthesis reaction was carried out for an hour. Calcium silicate 10 is added to the calcium silicate water slurry thus prepared.
0 parts by weight, latex (Nippon Zeon Corporation, trade name LX416) solid type is 5 parts by weight, melamine condensate-based dispersant (Showa Denko Co., Ltd., trade name Melment "-10")
Glass fiber (Nittobo (Tamaso, trade name: C3-12-GYD) 7 midfoot was added and mixed.

Next, 1q of highly dispersed calcium silicate slurry was added to 3
The mixture was filled into a 0 cm x 30 cm mold, dehydrated under pressure of 25 Kyf/C, dried at 145°C for 160 minutes, and formed into a calcium silicate molded body.

The test results of the molded bodies are shown in Table 1.

Comparative Example 1 A molded article was obtained in the same manner as in Example 1 except that no glass fiber was added. The test results are shown in Table 1.

Comparative Example 2 A molded article was obtained in the same manner as in Example 1 except that no latex was added. The test results are shown in Table 1.

Comparative Example 3 A molded article of 1 q was prepared in the same manner as in Example 1 except that no dispersant was added. The test results are shown in Table 1.

Comparative Example 4 α-type hemihydrate f for 1 part of calcium silicate 100@ff, similar to Example 1 of JP-A-160428M.
J 50 parts by weight and acrylamide polymer flocculant 1
．． Example 1 except that double foot was added and no dispersant was added.
A molded body was obtained in the same manner as above.

The test results are shown in Table 1.

Examples 2 to 5 Molded bodies were obtained in the same manner as in Example 1 except that the proportion of the dispersant added was changed as shown in Table 2. The test results are shown in the second
Shown in the table.

Examples 6 to 8 Molded bodies were obtained in the same manner as in Example 1 except that the proportion of glass fiber added was changed as shown in Table 3.

The test results are shown in Table 3.

Comparative Example 5 A molded article was obtained in the same manner as in Example 1, except that the proportion of glass fiber added was 35 parts by weight relative to 100 parts by weight of calcium silicate. The test results are shown in Table 3.

Examples 9 to 11 Molded bodies were obtained in the same manner as in Example 1, except that the addition ratio of latex was changed as shown in Table 4.

The test results are shown in Table 4.

Comparative Example 6 A molded article was obtained in the same manner as in Example 1, except that the addition ratio of latex was 50 parts by weight per 100 parts of calcium silicate. The test results are shown in Table 4.

Examples 12 to 14 Molded bodies were obtained in the same manner as in Example 1, except that the Fit 10 amount of water used during the hydrothermal synthesis reaction was changed as shown in Table 5. The test results are shown in Table 5.

Examples 15 to 18 Adding a tackifier (manufactured by Nippon Zeon Co., Ltd., product name N707) and a sulfur-based vulcanizing agent (manufactured by Nippon Zeon Corporation, product name N707) to latex.
Example 1 except that 25 parts by weight of a non-sulfur vulcanizing agent (manufactured by Takeda Pharmaceutical Company Ltd., trade name Prominate B-830), and a gelling agent (sodium fluorosilicide) were added to 100 parts by weight of latex. A molded body was obtained in the same manner as above. The test results are shown in Table 6.

Example 19 The tackifier described in Examples 15 to 18 was added to the latex,
A molded article was obtained in the same manner as in Example 1, except that 5 parts by weight of each of the non-sulfur vulcanizing agent and gelling agent were mixed and added to 100 parts by weight of latex. The test results are shown in Table 6.

〔Effect of the invention〕

The calcium silicate molded article of the present invention has a bulk specific gravity of 0.3 to
Although it is small at 0.7 g/C-rIi, it has high strength, excellent heat resistance, water resistance, dimensional stability, etc., and has workability equivalent to wood, and when heated to high temperatures, it has a S02
Since it does not emit toxic gases such as, it is suitable for use as an excellent building material.

Claims (4)

[Claims] (1) 100 parts by weight of calcium silicate, 1 to 3 reinforcing fibers
0 parts by weight, 1 to 40 parts by weight of latex and 0.0 parts by weight of dispersant.
A calcium silicate molded article consisting of 1 to 5 parts by weight. (2) The calcium silicate molded article according to claim 1, wherein the dispersant is a cement dispersant. (3) The latex is one in which 0.01 to 20 parts by weight of at least one of a tackifier, a sulfur-based vulcanizing agent, a non-sulfur vulcanizing agent, and a gelling agent are added to 100 parts by weight of the latex. A calcium silicate molded article according to claim 1. (4) Calcium silicate slurry, reinforcing fibers, latex, and dispersant are added to 100 parts by weight of calcium silicate, 1 to 30 parts by weight of reinforcing fibers, 1 to 40 parts by weight of latex, and 0.1 to 5 parts by weight of dispersant. 1. A method for producing a calcium silicate molded body, which comprises mixing the calcium silicate molded body at a ratio of 1 to 3, molding it, and then drying it.