JPS63201048A - Sepiolite formed body - 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 Application Field] The present invention relates to a sepiolite molded product, and in particular, it is lightweight, strong, and has excellent nonflammability, heat resistance, water resistance, etc., and is suitable as a fireproof insulation material for buildings. The present invention relates to a sepiolite molded body.

[Prior art] Calcium silicate molded bodies are lightweight, have excellent heat insulation and heat resistance, and are easy to work with, so they can be further reinforced with fibers to increase bending strength and toughness, and can be used as wall materials for construction. Widely used as flooring and other structural materials.

The calcium silicate molded body is made by mixing limestone raw material powder and silicate raw material powder in a ratio such that the molar ratio of CaO and SiO2 is approximately 1, adding water to the mixture, and performing a hydrothermal reaction to obtain a calcium silicate slurry. It is manufactured by dehydrating it and then drying it.

[Problems to be Solved by the Invention] However, although the calcium silicate molded body produced by such a method has excellent fire resistance and heat insulation properties and workability, it has low mechanical strength and is more likely to disintegrate into powder than the surface. Also, it has a drawback that it has a high water absorption property and can be destroyed by freezing of the absorbed water in cold regions.

In addition, the manufacturing process of calcium silicate molded bodies requires a hydrothermal reaction of the calcium silicate slurry, so an expensive autoclave device is required for this hydrothermal reaction, making the manufacturing process difficult. ! The reaction is complicated and requires a large amount of thermal energy.

[Means for Solving the Problems] The present invention solves these problems, and can be manufactured by a simple process and with low energy consumption, and is lightweight, strong, nonflammable, heat insulating, water resistant, etc. The objective is to provide a new material that has excellent properties and is suitable as a building material, and is a sepiolite molded product obtained by dehydrating a mixture obtained by mixing Seviolite adsorbed with a polymer emulsion, reinforcing fibers, and water, and then drying it. Therefore, the adsorption amount of polymer emulsion of Seviolite is 10% of Seviolite dry matter.
The mixing ratio of reinforcing fibers is 2 to 1 part by weight per 100 parts by weight of sepiolite dry matter.
5 parts by weight, and a sepiolite molded body obtained by dehydrating and molding a mixture obtained by mixing Seviolite adsorbed with a polymer emulsion, reinforcing fibers, calcium silicate slurry, and water, and then drying the mixture. Therefore, the adsorption amount of the polymer emulsion of Seviolite is 5 to 5 parts by weight on dry matter per 100 parts by weight of Seviolite dry matter.
30 parts by weight, the mixing ratio of reinforcing fibers to 100 parts by weight of sepiolite dry matter is 2 to 15 parts by weight, and the mixing ratio of calcium silicate slurry dry matter is 100 parts by weight or less. It is something to do.

The present invention will be explained in more detail below.

To produce the sepiolite molded article of the present invention, first, Seviolite adsorbed with a polymer emulsion is mixed with reinforcing fibers, water, and, if necessary, calcium silicate slurry.

Seviolite, in a narrow sense, is a type of magnesium hydrated silicate mineral, and has a multi-chain structure like amphibite, but in the present invention, palygorskite and attapulgite, which have a similar structure, can also be used. . Therefore, in the present invention, Seviolite is a concept that includes Seviolite in a narrow sense, palygorskite, attapulgite, and the like. These minerals, also called mountain bark or meerschaum, occur naturally, but can also be produced artificially. Sepiolite is a fibrous substance with a hollow structure, and has a high ability to adsorb other substances.

The particle size of Seviolite affects the dehydration efficiency during dehydration molding or the strength of the molded product. That is, if the diameter of the particles is small, the dehydration efficiency is low and a lot of energy is consumed during dehydration. Furthermore, if the diameter of the particles is large, the dehydration efficiency increases, but the strength of the obtained molded product decreases. Therefore, in the present invention, it is desirable that the particle size of Seviolite falls within the range of passing through a 149 μm mesh sieve to passing through a 0.59 mm mesh sieve.

Adsorption of the polymer emulsion onto Seviolite can be achieved relatively easily by simply adding a predetermined amount of the polymer emulsion to Seviolite powder and mixing. In this case, a dispersant may be used to improve the dispersion of the polymer emulsion and to speed up the adsorption. As the dispersant, fatty acid ester, polyoxyethylene, etc. can be used.

Examples of the polymer emulsion adsorbed on sepiolite include synthetic resin emulsions and rubber latex. Synthetic resin emulsions include, for example, emulsion polymerization of ethylenically unsaturated monomers such as vinyl acetate, vinyl chloride, acrylic acid or methacrylic acid, or esters thereof in an aqueous medium, or polymerization of two of these monomers. Examples include emulsions obtained by emulsion copolymerization of a mixture of more than one species. Specifically, polystyrene, ethylene-vinyl acetate copolymer, styrene-acrylonitrile copolymer, polymethyl methacrylate, polyvinyl chloride, ethylene-propylene copolymer, polyvinylidene chloride, polyethylene, polyvinyl acetate, Examples include impact polystyrene and ABS resin. Examples of rubber latex include natural rubber latex and synthetic rubber latex, such as styrene-butadiene rubber latex, acrylonitrile-butadiene rubber latex, butadiene rubber latex, polychloroprene rubber latex, acrylic rubber latex, isoprene rubber latex, and methyl acrylate. -Butadiene-based rubber latex, etc. may be mentioned. It is also possible to use a mixture of two or more of these.

If the amount of polymer emulsion adsorbed on sepiolite is small, the purpose of the present invention cannot be achieved, and if it is too large, the effect will be lost and the fire resistance of the product will be impaired. 5 to 30 parts by weight of dry matter.

Sepiolite adsorbed with such a polymer emulsion can be dispersed in a large amount of water as a medium, and the lower the concentration of sepiolite in water, the more evenly it is dispersed. In the present invention, the mixing ratio of water to 100 parts by weight of dry sepiolite varies depending on the presence or absence of calcium silicate slurry, but is generally preferably 300 to 800 parts by weight.

As the reinforcing fibers, natural or synthetic organic fibers such as glass fibers, carbon fibers, asbestos, kraft pulp, wood cloth, rayon, vinylon, nylon, polyvinyl alcohol, polyethylene, and polypropylene can be used.

These fibers can also be used in combination of two or more types.

If the amount of reinforcing fibers is too small, a sufficient reinforcing effect cannot be obtained, and if it is too large, the reinforcing effect is limited, which is economically disadvantageous. Moreover, when the reinforcing fibers are organic fibers, if the amount of the reinforcing fibers is too large, problems will arise in terms of the fire resistance of the resulting molded product. For this reason, in the present invention, the amount of reinforcing fibers to be mixed is 2 to 15 parts by weight per 100 parts by weight of sepiolite dry matter.

In the sepiolite molded body of the present invention, calcium silicate eternity can be used as a part of the constituent material. Calcium silicate ethos is the main constituent mineral of calcium silicate molded bodies, and like sepiolite, it contains many pores between its structures and has the effect of being able to produce lightweight molded bodies by compression molding. Sepiolite and calcium silicate permanent product can be mixed in any proportion to produce a molded article. However, when the proportion of calcium silicate hydrate increases, the bulk specific gravity slightly decreases, and the bending strength similarly decreases. Furthermore, increasing the amount of calcium silicate hydrate goes against the purpose of the present invention, which is to simplify the manufacturing process and reduce energy consumption. Therefore, in the present invention, the amount of calcium silicate permanent product is 100 parts by weight or less per 100 parts by weight of sepiolite dry material as calcium silicate slurry dry material.

Calcium silicate slurry is obtained by mixing limestone raw material powder and silicate raw material powder so that the molar ratio of CaO and 5iOs+ is approximately 1, and adding a sufficient amount of water to the mixture to cause a hydrothermal reaction.

In the present invention, a flocculant, other modifiers, etc. can be mixed and used as necessary in a mixture of sepiolite adsorbed with the above polymer emulsion, reinforcing fibers, etc. As flocculants, NaCJ2, CaCj12,
AlI3 (SO2)3, HCf, H2S O4, HN
O2% Phosphoric acid, CH3C0OH, acrylic acid, itaconic acid, polyamine-based or polyamide-based cationic polymer flocculants, alkylamine-based or quaternary ammonium salt-based cationic surfactants, etc. can be used.

In the present invention, Seviolite adsorbed with the polymer emulsion, reinforcing fibers, water, and if necessary, calcium silicate slurry and other additives are sufficiently mixed, the resulting mixture is dehydrated and molded, and the molded product is dried. . Dehydration molding is usually carried out by pressing, but depending on the shape of the molded product, paper molding, extrusion molding, vacuum molding, etc. can also be employed.

In the present invention, dehydration molding by pressing can be carried out according to a conventional method, and there are no particular restrictions on the processing conditions, but generally the pressing pressure is 30 to 60 kg f /
It should be about cm2.

Further, drying after dehydration molding is preferably carried out at 100 to 180°C, especially at 105 to 150°C.

[Function] In the present invention, Seviolite adsorbed with a polymer emulsion is used. During dehydration molding, a portion of the polymer emulsion adsorbed on Seviolite oozes out from Seviolite and enters between Seviolite, reinforcing fibers, and calcium silicate eternity, which are the constituent materials of the molded product, and firmly binds each other to each other. This results in a product with high bending strength. This also improves water absorption.

[Examples] The present invention will be described in more detail with reference to Examples and Comparative Examples below, but the present invention is not limited to the following Examples unless it exceeds the gist thereof.

Examples 1 to 3 Dried Seviolite having various particle sizes shown in Table 1 was prepared by grinding in a 0.000 mm mill for different times.

For each 100 parts by weight of dry Seviolite, 12 parts by weight of styrene-butadiene rubber latex (solid content equivalent)
5 parts by weight of glass fiber (Mineron (alkali-resistant glass fiber) manufactured by Nippon Palcar Co., Ltd.) and 4 times the weight of water relative to the dry weight of Seviolite were added thereto, and after thorough mixing, a press pressure of 50 kg was applied. Press dehydration molding was carried out at f/cm2, and the obtained molded product was dried at 120°C for 6 hours to form a molded product (length 150 mm x width 100 mm x thickness 10
A rectangular parallelepiped (mm) was manufactured.

The bulk specific gravity, bending strength, and dynamic elastic modulus of the produced molded body were measured, and the results are shown in Table 1.

The bending strength and elastic modulus are measured in accordance with JIS Z2113.
The following method was used to conduct the bending test for wood.

That is, a load is applied to a specimen of approximately 100 mm (width) x 150 mm x lOmm (thickness) at a rate of inn/min, and the maximum load P (kgf) at that time and the load F (kgf/cm) required to deflect 1 mm are determined. Calculated by. However, △P: the difference between the upper limit load and lower limit load in the proportional region (kgf
) △y: Deflection at the center of the span relative to △P (cm) fL varnish span (cm) h: Specimen thickness (cm) b: Specimen width (cm) ■=Second moment of area (Cm') h3 Example 4 297μmlA 12 parts by weight of styrene-butadiene rubber latex (in terms of solid content) was adsorbed on 100 parts by weight of dry Seviolite passed through the sieve, and 20 parts by weight of calcium silicate slurry (in terms of solid content), 6 parts by weight of glass fiber, and A mixture of dry sepiolite and 3 times the weight of water was mixed, dehydrated and molded in the same manner as in Example 1, and then dried to obtain a molded product.

Note that the calcium silicate slurry is prepared by mixing slaked lime and crystalline silica stone powder so that the molar ratio of 5i02 and CaO is 1:1, and adding water four times the weight of the solid content to make a slurry.
The slurry was reacted for 1 hour at 0°C to form a gel, and then 3
The product was produced by adding twice the weight of water and reacting at 210° C. for 4 hours with stirring in an autoclave.

The bulk specific gravity, bending strength, and elastic modulus of the obtained molded body were measured in the same manner as in Example 1, and the results are shown in Table 1.

Example 5 A molded body was produced in the same manner as in Example 4, except that the adsorption amount of styrene-butadiene rubber latex was 15 parts by weight, the calcium silicate slurry was 50 parts by weight, and the glass fiber was 15 parts by weight. , conducted tests to measure its physical properties. The results are shown in Table 1.

Example 6.7 Molded bodies were produced in the same manner as in Example 4, except that acrylic resin emulsion (Example 6) or vinyl chloride resin (Example 7) was used instead of the styrene-butadiene rubber latex. , conducted tests to measure its physical properties. The results are shown in Table 1.

Comparative Example 1 To 100 parts by weight of the calcium silicate slurry synthesized in Example 4, 10 parts by weight of styrene-butadiene rubber latex,
After adding 5 parts by weight of glass fibers and 0.5 parts by weight of a coagulant (polyacrylamide (manufactured by Kishida Chemical Industry Co., Ltd.)) and thoroughly mixing them, a press pressure of 50 kg f/cm 2 was applied.
The molded product was press-dehydrated and dried at 120° C. for 6 hours to produce a molded product. Table 1 shows the physical property measurement test results of the obtained molded product.

From Table 1, it is clear that the sepiolite molded article of the present invention has extremely high bending strength and is also rich in elasticity.

[Effects of the Invention] As detailed above, the method for producing a Seviolite molded article of the present invention involves mixing Seviolite adsorbed with a predetermined amount of polymer emulsion, reinforcing fibers, water, and, if necessary, calcium silicate slurry. It is obtained by dehydrating and molding the resulting mixture and then drying it, and the reinforcing fibers, sepiolite, and calcium silicate, which are the constituent materials of the molded product, are firmly bonded to each other by the action of the polymer emulsion adsorbed on sepiolite. The molded product obtained has bending strength,
Bending elasticity is greatly improved. Moreover, the molded article of the present invention can be produced with low energy consumption.

Therefore, according to the present invention, a molded article is provided that is lightweight, strong, and has excellent heat insulation, fire resistance, water resistance, etc., and furthermore, this molded article can be produced industrially with great advantage. . The molded article of the present invention is extremely useful as a building material and the like.

Agent Patent Attorney Tsuyoshi Shigeno Procedural amendment

Claims (4)

[Claims] (1) Sepiolite adsorbed with polymer emulsion,
A sepiolite molded body obtained by dehydrating and drying a mixture obtained by mixing reinforcing fibers and water, wherein the polymer emulsion adsorption amount of sepiolite is 5 to 30 parts by weight of dry matter per 100 parts by weight of sepiolite dry matter, A sepiolite molded article characterized in that the mixing ratio of reinforcing fibers to 100 parts by weight of dry sepiolite is 2 to 15 parts by weight. (2) The particle size of sepiolite is 149 μm through a mesh sieve to 0.
The sepiolite molded article according to claim 1, which is within the range of passing through a 59 mm mesh sieve. (3) The sepiolite molded article according to claim 1 or 2, wherein the sepiolite is a natural or artificial magnesium hydrated silicate mineral. (4) Sepiolite adsorbed with polymer emulsion;
A sepiolite molded body obtained by dehydrating and drying a mixture obtained by mixing reinforcing fibers, calcium silicate slurry, and water, wherein the polymer emulsion adsorption amount of sepiolite is 5 parts by dry matter based on 100 parts by weight of sepiolite dry matter. -30 parts by weight, the mixing ratio of reinforcing fibers to 100 parts by weight of sepiolite dry matter is 2 to 15 parts by weight, and the mixing ratio of the calcium silicate slurry dry matter is 100 parts by weight or less.