JP2000016882A - Hydraulically cured product and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cured product excellent in heat insulating properties, fire resistant properties/fire properties, mechanical characteristics and durability and having bubbles by kneading inorganic hydraulic material, resin particles, organic polymer and water in a specific content ratio while entraining gas. SOLUTION: This hydraulically cured product is obtained by compounding 100 pts.wt. inorganic hydraulic material such as hydraulic cement, latently hydraulic cement, etc., 0.1-30 pts.wt. resin particles having 0.5-5 mm particle diameter, being finely divided particles or powder of organic resin, pref. being organic polymer usable for polymer cement such as acrylic emulsion, poly(vinyl acetate) emulsion, poly(vinyl acetate-co-Veova) emulsion, etc., 1-100 pts.wt. water and, optionally, 50-500 pts.wt. aggregate such as river sand, silica sand, crushed gravel, intumescent calcium carbonate, etc., and then by kneading the composition while entraining air, followed by molding it in a molding tool. The cured product has finely divided bubbles in the surface part as well and is excellent in waterproofness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulically cured product and a method for producing the same, and more particularly to a hydraulically cured product having bubbles and a method for producing the same.

[0002]

2. Description of the Related Art A cellular concrete or an organic composite solid is used as a hydraulic hardened product for a building or a building which is lightweight and excellent in heat insulation. Conventionally, aerated concrete is a method in which aluminum powder is mixed with cement slurry composed of cement, aggregate, water, etc. and foamed with hydrogen gas,
There is known a method in which water to which a surfactant is added is foamed, and cement, an aggregate, and the like are added thereto. on the other hand,
As a composite solid material of styrofoam / cement, a crushed group of melted and solidified styrofoam bodies is bonded and fixed using a cement paste made of cement / water as a medium, and a composite solid material having a required molded shape is disclosed. (Japanese Unexamined Patent Publication No. Hei. 5-194057).

[0003]

However, when an organic substance is compounded for the purpose of reducing the weight, there is a problem that the fire resistance and fire resistance of the hydraulically cured product cannot be maintained. Also,
Aerated concrete has a problem that a material having a balance between heat insulating properties and mechanical properties such as toughness and workability as a structural material cannot be obtained. Further, the method for producing cellular concrete also has a problem that a special compounding agent and a special device are required.

[0004] The present invention has been made to address such problems, and includes heat insulation, fire and fire resistance, mechanical properties, and the like.
An object of the present invention is to provide a hydraulically cured product having bubbles having excellent durability and a method for producing the same.

[0005]

Means for Solving the Problems The hydraulic cured product of the present invention is a hydraulic cured product having air bubbles, wherein the hydraulic cured product is composed of 100 parts by weight of an inorganic hydraulic material, 0.1 to 30 parts of resin particles. Parts by weight, 1-100 parts by weight of organic polymer. Here, the hydraulically hardened body refers to a solid for architectural / construction or a molded body mainly composed of an inorganic compound which is hardened by reacting with water.

The method for producing a hydraulically cured product of the present invention is a method for producing a hydraulically cured product having bubbles obtained from an inorganic hydraulic material, resin particles, an organic polymer and water. 100 parts by weight of hard material, 0.1 to 30 parts by weight of the resin particles, 1 to 100 parts by weight of the organic polymer, and 1 to 100 parts of water
It is characterized by having a kneading step of kneading while mixing gas with a weight part.

According to the present invention, a hydraulically cured product having fine bubbles can be obtained by the above-mentioned composition and by employing a method of kneading while involving gas. Further, since the water content of the mixture at the time of kneading is transferred into the fine bubbles of the gas entrained in the inorganic hydraulic material or the like by kneading, the hydraulic hardened body is more easily and uniformly dried. As a result, the hydraulic cured product of the present invention is excellent in heat insulation, fire and fire resistance, mechanical properties, and durability. Furthermore, since the obtained hydraulically cured product has fine bubbles also on the surface, the surface exhibits a water-repellent tendency without using a water-repellent material such as silicones or fluorine compounds, and is excellent in waterproofness. .

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The hydraulic cured product of the present invention preferably contains air bubbles so that the specific gravity of the hydraulic cured product is 0.2 to 0.8. The cells contained in the hydraulically cured product of the present invention have a cell ratio defined by the volume ratio in the range of 20 to 80%, and each cell has an average diameter of 0.02 to 2.0 m.
m, preferably in the range of 0.2 to 1.0 mm, more preferably about 0.5 mm. The presence of such fine bubbles not only excels in heat insulation properties and toughness, but also develops the surface water repellency of the hydraulic cured product. As a gas that becomes a bubble, any substance that becomes a gas at room temperature, for example, 25 ° C. can be used. For example, air, nitrogen gas, carbon dioxide gas and the like can be mentioned. In the present invention, air that is easy to knead while circulating is preferable.

The inorganic hydraulic material according to the present invention can be used as long as it reacts with water to form a cured product, and examples thereof include inorganic cements, ettringite, and gypsum. Among these, insulation, toughness,
Inorganic cements from which durability can be easily obtained are preferred. Inorganic cements include hydraulic cements such as Portland cement, early-strength Portland cement, white Portland cement, alumina cement, calcined gypsum, etc .; Cements, silica cement, fly ash cement, lime silica cement,
Examples thereof include mixed cements such as alkali silicate, oxychloride cement, and phosphoric acid cement. Among them, hydraulic cements and latent hydraulic cements are preferable as inorganic hydraulic materials capable of containing air bubbles.

[0010] An aggregate can be blended with the inorganic cement. Examples of the aggregate include river sand, quartz sand, crushed gravel, calcium carbonate, obsidian perlite, perlite perlite, calcined vermiculite, and shirasu balloon. The mixing ratio of the inorganic cement and the aggregate is preferably 50 to 500 parts by weight of the aggregate with respect to 100 parts by weight of the inorganic cement. Within this range, the hydration reaction of the inorganic cement can be maintained and the strength can be maintained.

The resin particles according to the present invention may be any fine particles or powder of a synthetic resin which contributes to the reduction of the weight of the hydraulic hardened material and can be blended with the inorganic hydraulic material. The particle size of the fine particles is 0.5 to 5 mm, preferably 2 to 4 mm, and more preferably about 3 mm. Also, the fine grain shape is preferably circular. Among the resin particles, fine particles or powder of an organic foam are preferable because they contribute to further weight reduction. Organic foams can be formed by adding a foaming agent to an organic resin and using gas generated during heating.
Any reactive resin can be used as long as it can be obtained by a foam molding method in which the reactive resin is molded using a gas generated during the reaction.

Further, types of resin such as thermoplastic resin and thermosetting resin which form the resin particle body, foaming means such as decomposition type foaming agent and evaporation type foaming agent, and molding methods such as injection foaming method and extrusion foaming method. , Foaming ratio 3 ~ 4 times or less low foaming or 10 ~
The expansion ratio such as high expansion of 70 times and the cell structure such as closed or open cells can be variously selected depending on the type and application of the hydraulic cured product of the present invention. For example, when heat insulation is particularly required, such as for outer walls, a closed cell structure is preferred. In the present invention, expanded polyolefin such as expanded polystyrene, expanded urethane, expanded polyethylene and expanded polypropylene is suitable for reducing the strength and weight of a building panel and the like. Further, fine particles or powder obtained by crushing a molten solidified organic foam may be used. In this case, it is possible to contribute to recycling of the discarded organic foam.

The organic polymer according to the present invention can be used as long as it can be used for a polymer cement obtained by blending an organic binder with a mixture of inorganic cement and, if necessary, aggregate. it can. The organic polymer is taken into the inorganic cement together with the hydration reaction of the inorganic cement, and imparts water resistance and durability. For example, acrylic emulsion, polyvinyl acetate emulsion, polyvinyl acetate / veova copolymer emulsion and the like can be exemplified.

The mixing ratio of the inorganic hydraulic material, the resin particles and the organic polymer is 0.1 to 30 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of the inorganic hydraulic material. The amount of the organic polymer is 1 to 100 parts by weight, preferably 5 to 30 parts by weight. By setting the mixing ratio of each material in the above range, bubbles are easily included by kneading while involving gas. As a result, heat insulation, fire and fire resistance, mechanical properties, and durability are improved.

The method for producing a hydraulically cured product of the present invention will be described. 100 parts by weight of inorganic hydraulic material and the above resin particles 0.1
By kneading 30 parts by weight, 1-100 parts by weight of the above-mentioned organic polymer and 1-100 parts by weight of water while involving gas, a hydraulically cured product having air bubbles can be obtained. As the inorganic hydraulic material, the resin particles, and the organic polymer, the above-described materials can be used. The kneading may be performed after the inorganic hydraulic material and the resin particles are preliminarily uniformly mixed, or may be a method of sequentially adding the materials to be blended. As the kneading means, any method can be used as long as air bubbles can be involved. For example, a method of stirring while blowing air,
There is a method of stirring while entraining air. The method of stirring while blowing air is a method of kneading while supplying air to the inside of the mixture in a stirring device having an anchor type or a propeller type stirring blade and an air blowing port. The method of stirring while entraining air is
For example, a method of entraining air while circulating and stirring the mixture in the vertical direction. Specifically, it is a method of entraining air by repeating part of the mixture and mixing and stirring again. Further, an admixture can be blended as an auxiliary for entrapping air bubbles.

The hydraulically cured product of the present invention has a heat insulating property,
Since it is excellent in mechanical properties such as fire resistance and toughness, durability, and surface water repellency, it can be used as a constituent member of buildings and structures, industrial equipment, indoor and outdoor equipment, furniture and the like.

[0017]

Example 1 100 parts by weight of Portland cement as an inorganic hydraulic material,
As resin particles, 3 parts by weight of styrene foam particles having a particle diameter of 3 mm, 10 parts by weight of a vinyl acetate emulsion (resin solid content: 40% by weight), and 20 parts by weight of water were mixed. A part of this mixture was lifted upward, and then sufficiently mixed by circulating agitation for mixing and stirring again. The mixture was poured into a molding die to obtain a 20 mm thick hydraulically hardened building board.

The specific gravity of the obtained building board is 0.60, the cell ratio is 50%, the cell particles have an average particle size of 0.5 mm, and the thermal conductivity is
It was 0.05 kcal / h ° Cm. This board was easily cut with a knife, a cutter or the like, and had excellent workability. In addition, the moisture adhering to the board surface became polka dots and was excellent in waterproofness.

Using this board, JIS A 130
A fire performance test was conducted based on the 1 standard. The size of the test board is 213cm in width and 288cm in height. The heating class is outdoor fire protection class 2 (heating time 30 minutes, maximum temperature 840 ° C). The heating source of the heating furnace is city gas (11,000kcal / m ³ ). The temperature was measured at a flame temperature 1 cm away from the heated surface, and the temperature was measured at approximately the center. FIG. 1 shows the measurement results. In FIG. 1, a curve 1 is a heating temperature measurement result,
Curve 2 is a temperature measurement result on the back surface of the test board.
The temperature on the back side of the test board is approx.
It was 100 ° C or less, and had sufficient fire protection performance. In addition, no harmful deformation, destruction, dropout, etc., was observed on the test board. In addition, the flame on the front and back of the test board,
No ignition was observed and no harmful smoke was generated.

Examples 2 to 5, Comparative Example 1 The composition shown in Table 1 was used in the same manner as in Example 1 to a thickness of 20 mm.
Was obtained as a hydraulic cured product. The characteristics of the obtained board were evaluated in the same manner as in Example 1. Table 1 shows the results.

[0021]

[Table 1] As shown in Table 1, the building boards of Examples 2 to 5 were excellent in fire prevention performance.

[0022]

The hydraulic hardened material of the present invention is an inorganic hydraulic material 1
00 parts by weight, resin particles 0.1 to 30 parts by weight, organic polymer
It can be obtained from 1 to 100 parts by weight and 1 to 100 parts by weight of water and has fine bubbles, so it has thermal insulation, fire and fire resistance, mechanical properties,
Excellent durability. In addition, a hydraulically cured product having a waterproof surface can be obtained.

According to the method for producing a hydraulic cured product of the present invention, a hydraulic cured product having fine bubbles can be easily obtained. Also,
The obtained hydraulically cured product is excellent in heat insulation, fire and fire resistance, mechanical properties, and durability.

[Brief description of the drawings]

FIG. 1 is a diagram showing measurement results of a fire prevention performance test.

[Explanation of symbols]

 1 Curve showing heating temperature measurement result. 2 Curve showing the result of temperature measurement on the back of the test board.

Continued on the front page (72) Inventor Itsuo Yumae 336 Ikuwa-cho, Yokkaichi-shi, Mie Japan Chemical Industry Co., Ltd. (72) Inventor Tadashi Sakai 3-30-10-905 Kujo Minami, Nishi-ku, Osaka-shi, Osaka F-term (reference) in the Seto Ogawa Laboratory 4G012 MC01 PB21 PB27 PB30 PC11 PC13 PC14

Claims (2)

[Claims] 1. A hydraulically hardened material having air bubbles, wherein said hydraulically hardened material is composed of 100 parts by weight of an inorganic hydraulic material and a resin particle material.
0.1 to 30 parts by weight, organic polymer 1 to 100 parts by weight, water 1
A hydraulically cured product obtained from 100 to 100 parts by weight. 2. A method for producing a hydraulically hardened material having bubbles obtained from an inorganic hydraulic material, a resin particle, an organic polymer, and water, comprising: 100 parts by weight of the inorganic hydraulic material and the resin particle. A method for producing a hydraulically cured product, comprising a kneading step of kneading 0.1 to 30 parts by weight, 1 to 100 parts by weight of the organic polymer, and 1 to 100 parts by weight of water while involving gas.