JPS62176949A - Calcium silicate gypsum composite 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 [Field of Industrial Application] The present invention relates to a calcium silicate/gypsum composite used as a building material for general housing, a fireproof coating material for high-rise buildings, a heat insulating material, a joint material, etc.

[Conventional technology]

Calcium silicate building materials are made of lightweight cellular concrete obtained by using silicate raw materials and lime raw materials as main raw materials (a) adding gold-14 aluminum powder, etc. and curing at high temperature and high pressure in an autoclave (b) calcium silicate hydrate. Molded products made by mixing reinforcing am (c) There are molded products made by pressing or paper-making with reinforcing fibers added thereto.

All of these silicate rhusium molded bodies have a surface hardness of □
It has the disadvantage of being small and powdery.

In addition, molded products mixed with reinforcing fibers are generally used as fire-resistant coating materials, and therefore have a small bulk specific gravity of around 0.1 to 0.4, and the water-containing cake before drying has a large amount of water, and the energy used for drying is large. is huge and expensive.

Since the paper molded product is a laminate made by a papermaking method, the strength between the laminates is low, and peeling occurs between the laminates.

Another example of plaster-based building materials is plasterboard.

Gypsum board is dehydrated at around 130℃,
Because the strength of the cured product is reduced and paper, wood chips, etc. are present, it is not certified as a noncombustible material and cannot be used as a fireproof material at high temperatures.

[Problem that the invention seeks to solve]

We are continuing our intensive research to improve the surface hardness, drying economy, and interlaminar strength of calcium silicate, and to improve the heat resistance, fire resistance, etc. of plasterboard. As a result, ii! as a new building material! This led to the development of a unique complex. In other words, by adding and mixing plaster, synthetic resin emulsion, and reinforcing fibers to calcium silicate permanent to form a composite, we were able to compensate for the drawbacks of calcium silicate and gypsum and obtain new desirable properties. The object of the present invention is to provide such a novel complex.

[Means for solving problems]

The gist of the present invention is a calcium silicate/gypsum composite characterized by comprising a mixture of hydrothermally synthesized calcium silicate hydrate, plaster, synthetic resin, and reinforcing fibers.

In a preferred embodiment of the present invention, the calcium silicate hydrate contains one or two types of crystals of xonotlite or tobermorite, and the ratio of the calcium silicate hydrate to hydraulic gypsum is The weight ratio in terms of other substances is 3 to 8:2.

In addition, the synthetic resin is an emulsion or water-soluble, and the mixing amount is 10 parts of the calcium silicate hydrate and plaster mixture.
The amount of reinforcing fibers mixed is preferably 0.1 to 10 parts by weight per 0 parts by weight, and the amount of reinforcing fibers mixed is preferably 1 to 20 parts by weight per 100 parts of the calcium silicate hydrate and plaster mixture. .

The composite of the present invention can be obtained as follows.

First, the calcium silicate permanent product constituting the present invention uses slaked lime, quicklime as calcareous raw materials, fine silica sand, silica powder, silica clay, etc. as silicic raw materials, and has a CaO/SiO2 molar ratio of 0.6 to 1.1c7). Add 10 parts by weight of water to 1 part by weight of solid content, mix thoroughly and flow into an autoclave equipped with a stirrer to achieve a saturated water vapor pressure of 5 kg/crn'.
A calcium silicate hydrate slurry is obtained by curing at high temperature and high pressure for 4 to 15 hours at ~25 kg/crn'. Further, by dehydrating this slurry, a paste-like hydrated calcium silicate hydrate is obtained.

Hydraulic plasters include α-type hemihydrate gypsum, β-type gypsum, and β-type gypsum.
Use type semi-hydrated gypsum or typeless gypsum.

Calcium silicate hydrate and hydraulic gypsum are mixed so that the weight ratio (in terms of dry matter) is within the range of 3 to 8:2.

Synthetic resin emulsions include acetic acid resin emulsion,
General water-soluble adhesives and air entraining agents such as acrylic resin emulsions are selected, and one or more types of synthetic resin emulsions are used.

1 to 10 parts of the synthetic resin emulsion are added and mixed to 100 parts of the calcium silicate and plaster mixture.

Furthermore, known reinforcing M&fibers such as asbestos, nylon, vinylon, aramid, polypropylene, carbon, glass,
One to three pulp fibers are selected from In and the like, and 1 to 20 parts by weight of these are added and mixed to the above-mentioned preparation.

The composite obtained as described above is molded by a known molding method, such as a press method, a papermaking method, an extrusion molding method, a molding method, etc., or by spraying, etc., onto the surface of other structural materials. After curing and drying, a calcium silicate-based plaster composite is obtained.

Such molded composites are used as interior and exterior materials for buildings. In addition, the composite can be used as a joint material for joints of building materials and as an adhesive material,
Form a complex.

[Effect]

The crystals of xonotlite and tobermorite, which are calcium silicate hydrates hydrothermally synthesized according to the present invention, have weak bonding strength, and high strength cannot be obtained even when molded and dried.

However, when hydraulic gypsum is added and mixed, the two gypsum crystals that are precipitated by hydration of the hydraulic gypsum are long and large crystals, which are entangled with crystals of xonotrite and tobermorite, which are calcium silicate permanents. They are strongly bonded, and since one synthetic resin emulsion is added, this fills the voids between the crystals, resulting in even stronger bonding.

In this way, strong 1. Due to the intertwining between 'J' crystals and the filling effect of the synthetic resin emulsion, the surface hardness is reduced to 4 pieces,
It has strong planting strength, and when combined with calcium silicate hydrate, the heat resistance of gypsum is improved.

〔Example〕

Example 1 A special edition of industrial slaked lime was used as the calcareous raw material, and fine silica sand with a Blaine value of 4000 crn'/H was used as the silicate raw material 1, and a CaO/SiO2 molar ratio of 1 was used. was added to form a slurry, poured into an autoclave equipped with a stirrer, and maintained at a saturated vapor pressure of 15 kg/crn' for 8 hours to obtain a xonotrite calcium silicate hydrate.

40 parts of the thus synthesized xonotlite calcium silicate hydrate (dry weight), 10 parts of calcined plaster, 1 part of acrylic resin emulsion, 5 parts of amosite asbestos (k-3) as reinforcing fiber, lightweight material (perlite treated) No. 2) 2 parts and 200 parts of water were uniformly mixed and the pressure was 5 kg/crrI'.
It was dehydrated and pressure molded. Pressure molded cake 100”0
The calcium silicate/gypsum composite was dried with hot air in an atmosphere of

As a comparative example, a calcium silicate molded body (commercially available 2
The physical properties are shown in Table 1. Example 1 shows excellent bending strength and compressive strength.

Example 2 40 parts of the xonotlite calcium silicate permanent product synthesized in Example 1 (dry weight), 10 parts of calcined plaster, 1 part of acrylic modified vinyl acetate emulsion, 5 parts of amosite asbestos (k-3) as reinforcing fiber, water 200 parts were mixed uniformly and dehydrated and molded at a pressure of 10 g/cm".The pressure molded cake was dried with hot air in an atmosphere of 100°C to obtain a calcium silicate/gypsum composite. Its physical properties are shown in Table 2 together with a comparative example (calcium silicate molded body with the same density (commercially available product No. 1)).

Example 3 25 parts of the xonotrite calcium silicate permanent product synthesized in Example 1 (on a dry matter basis), 25 parts of calcined plaster, 2 parts of styrene-butadiene copolymer emulsion, and 5 parts of amosite asbestos (k-3) as reinforcing fiber. , 3 parts chrysotile, 2 parts water
00 parts were added, mixed uniformly, and dehydrated and pressure molded at a pressure of 15 kg/ctn'. The pressure-molded cake was dried with hot air at 100°C to obtain a calcium silicate/gypsum composite.

Example 4 Added 20 parts of the xonotrite calcium silicate permanent product synthesized in Example 1 (in terms of dry matter), 30 parts of calcined plaster, 2 parts of styrene-butadiene copolymer emulsion, 4 parts of #J1m glass as reinforcing fiber, and 200 parts of water. Mix uniformly and press 1
It was dehydrated and pressure molded at 5 kg/crn'. The pressure-molded cake was dried with hot air at 100°C to obtain a calcium silicate/gypsum composite. Physical property values are shown in Table 3.

Example 5 Using carbide water slag as a calcareous raw material and diatom powder (produced in Akita) as a silicic raw material, CaO/S
i 02 molar ratio to 0.8, add 9 times the amount of water to the solid content to make a slurry, pour it into an autoclave with a stirrer, hold it at a saturated vapor pressure of 12 kg/crn' for 6 hours, and make a tobermorite-based slurry. A calcium silicate permanent product was obtained. To 25 parts of tobermorite-based calcium silicate permanent product (dry weight equivalent) synthesized in this way, 25 parts of calcined gypsum,
Add 2 parts of styrene-butadiene copolymer emulsion, 5 parts of amosite asbestos (k-3) as reinforcing fiber, 3 parts of chrysotile, and 200 parts of water, mix uniformly, and press 15k.
It was dehydrated and pressure molded at g/crn'. The pressure-molded cake is dried with hot air at 100°C to form calcium silicate.
Obtained the Setsuko complex. The physical property values are shown in Table 3.

Example 6 To 20 parts of the tobermorite-based calcium silicate permanent product (dry weight equivalent) synthesized in Example 5, 30 parts of calcined plaster, 2 parts of styrene-butadiene copolymer emulsion, 4 parts of glass m-fiber as reinforcing fiber, and water were added. 200 parts were added and mixed uniformly, followed by dehydration and pressure molding at a pressure of 15 kg/cm'. The pressure-molded cake was dried with hot air at 100°C to obtain a calcium silicate/gypsum composite. Physical property values are shown in Table 3.

Table 3 shows Examples 3 to 6, and also lists the physical property values of commercially available calcium silicate molded bodies for ships that are comparable to these. All of the examples of the present invention have excellent physical property values.

Example 7 30 parts of xonotlite calcium silicate hydrate (dry weight equivalent) synthesized in Example 1, 20 parts of calcined plaster, 5 parts of acrylic modified vinyl acetate emulsion, 1 part of glass fiber (chopped strand 6 mm length), Setsuko hardening regulator (
1 part of Puff Start 02) manufactured by Ajinomoto Co., Ltd. and 100 parts of water were added and mixed to obtain a paste.

This paste can be used as a repair agent for damaged parts of fireproof covering boards, and as a joint filler.
It has been used with good results as a repair agent for adhesives, adhesives, and other building materials.

Example 8 25 parts of xonotlite calcium silicate hydrate (dry weight) synthesized in Example 1, 25 parts of calcined plaster, 5 parts of styrene-butadiene co-m combination emulsion, curing of plaster: Am agent (Ajinomoto Co., Ltd.) Puff start 02) 1 part, wood 2
00 parts were added and mixed, and further 50 parts of slag wool was added and mixed to obtain a paste that was softer than that of Example 7.

This flexible paste was sprayed as a fireproof coating material and coated on a steel frame to a thickness of 50 mm with a "trowel" finish.

Table 4 shows the physical property values of Examples 7 and 8. Note that the physical property values of Examples 7 and 8 are values obtained when molded.

Physical property tests were attempted on commercially available products in the same manner as in Examples 7 and 8, but due to extremely large variations in physical properties, comparable values could not be obtained. Many of the products equivalent to Example 7 were made of water glass, and the drying shrinkage was particularly large, and cracks were noticeable. Moreover, many products equivalent to Example 8 are cement-based.

This also had noticeable drying shrinkage and could not be finished to a uniform density.

〔Effect of the invention〕

Comparing the physical properties of the calcium silicate/gypsum composite of the present invention with the physical properties of cured products of calcium silicate and plaster, we find that a) not only is the strength improved compared to calcium silicate, but the biggest drawback is The so-called powderiness of the surface, that is, the surface hardness, has been improved, and several improvements have been made to paintability, laminarity, screw retention, etc.

b) - On the other hand, compared to plaster, heat resistance and water resistance were improved.

Therefore, the composite of the present invention has extremely excellent properties as a building material, and can be widely used as interior and exterior materials, finishing materials, repair materials, and covering materials for buildings, making a great contribution.

Claims (1)

[Claims] 1 Hydrothermally synthesized calcium silicate hydrate, gypsum,
A calcium silicate/gypsum composite characterized by consisting of a mixture of synthetic resin and reinforcing fibers. 2. The calcium silicate/gypsum complex according to claim 1, wherein the calcium silicate hydrate contains one or two types of crystals of xonotlite or tobermorite. 3. The calcium silicate/gypsum composite according to claim 1, wherein the ratio of calcium silicate hydrate to hydraulic gypsum is 3:7 to 8:2 in terms of dry matter weight ratio. . 4. Claim 1, characterized in that the synthetic resin is an emulsion or water-soluble, and the amount mixed is 0.1 to 10 parts by weight per 100 parts by weight of the calcium silicate hydrate and gypsum mixture. The calcium silicate/gypsum complex according to item 1 or 3. 5. Claim 1, characterized in that the amount of reinforcing fibers mixed is 1 to 20 parts by weight per 100 parts by weight of the calcium silicate hydrate and gypsum mixture.
The calcium silicate/gypsum complex according to item 1 or 3.