JPH06329482A - Production of lightweight inorganic building material - Google Patents

Abstract

PURPOSE:To provide a method for producing a lightweight inorganic building material capable of preventing crush of inorganic lightweight aggregate and simultaneously sufficiently suppressing spring back phenomenon due to organic lightweight aggregate and thereby capable of making the weight sufficiently lightweight and of controlling the shape. CONSTITUTION:This method for producing the lightweight inorganic building material is constituted of steps carried out by blending 100 pts.wt. blend consisting of a cement, a siliceous raw material and a reinforcing fiber with 10-30wt.% inorganic lightweight aggregate and 1-5wt.% crushed body of a thermoplastic synthetic resin crushed to 0.3-1.2 mm particle diameter as an organic lightweight aggregate and adding water thereto, kneading the blend, subjecting the kneaded material to extrusion molding under <=15kg/cm<2> extrusion pressure to provide a molding and curing the molding in an autoclave. The objective lightweight inorganic building material is produced by mutually compensating defects of inorganic lightweight aggregate and organic lightweight aggregate by combined use of both aggregates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a lightweight inorganic building material, and more particularly to an improvement in the method for producing a lightweight inorganic building material by extrusion molding.

[0002]

2. Description of the Related Art Conventionally, an inorganic building material made of fiber reinforced cement has been very widely used as a building material. This kind of building material has the advantages that it can be mass-produced with the same strength, material and shape, and that it is convenient for nature protection because it does not use natural materials such as wood. However, the above-mentioned building materials have the disadvantage that they have large specific gravity and are hard and have poor workability due to their properties. Therefore, in these inorganic building materials, it is attempted to reduce the weight by adding an inorganic or organic lightweight aggregate, and by adding these lightweight aggregates, significant reduction in weight and improvement in workability are achieved (for example, JP 58
-55360, etc.).

[0003]

However, in the above-mentioned weight reduction technique, when an inorganic material added with an inorganic lightweight aggregate such as pearlite is formed into a product shape by extrusion molding, the inorganic material is sheared by an extruder. There is a problem that the lightweight aggregate is crushed and as a result it is difficult to reduce the weight corresponding to the addition, and in the case of organic lightweight aggregate such as expanded styrene beads, although it is not crushed by shearing pressure,
Immediately after being discharged from the extrusion die, a springback phenomenon may occur due to the elasticity of the foam aggregate, and the product surface shape may be deformed, which requires various correction steps later.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, the present invention prevents crushing of an inorganic lightweight aggregate at the same time as manufacturing a lightweight inorganic building material by extrusion molding, and at the same time, a spring of an organic lightweight aggregate. The purpose of the present invention is to provide a method for manufacturing a lightweight inorganic building material, which can sufficiently suppress the back phenomenon, and thereby can achieve sufficient weight reduction and shape regulation.

[0005]

[Means for Solving the Problems] That is, the method for producing a lightweight inorganic building material according to the present invention is such that an inorganic lightweight aggregate is added to 100 parts by weight of a mixture consisting of cement, siliceous raw material and reinforcing fiber.
10-30% by weight, 0.3-1.2 mm particle size as an organic lightweight aggregate
1 to 5% by weight of crushed thermoplastic synthetic resin
It is characterized in that it is blended, kneaded with water and extruded into a product shape at an extrusion pressure of 15 kg / cm ² or less, and the molded body is subjected to autoclave curing.

[0006]

The cement compound used in the present invention is the same as the conventional one, and there is no particular description about the kind and the amount of the compound material. This invention is characterized in that both an inorganic lightweight aggregate such as perlite and an organic lightweight aggregate such as expanded polystyrene beads are used as a lightweight aggregate added to the cement composition for the purpose of weight reduction. .

Both of them contribute to the weight reduction of the inorganic building material, but the organic lightweight aggregate acts as a cushioning material for the inorganic lightweight aggregate which is added at the same time due to the elasticity of the inorganic lightweight aggregate, and the organic lightweight aggregate during extrusion molding of the inorganic lightweight aggregate. Prevents shear failure. On the other hand, the inorganic lightweight aggregate reduces the addition of the organic lightweight aggregate by the amount added, and suppresses the springback phenomenon caused by the organic lightweight aggregate. That is, the two synergistically contribute to effective weight reduction.

[0008] In the above, raw materials for inorganic materials such as cement
Limiting the inorganic lightweight aggregate to 10 to 30% by weight relative to 100% by weight is that if it is less than 10% by weight, sufficient weight reduction cannot be achieved, and springback due to an increase in the addition amount of the organic lightweight aggregate. This is because the phenomenon cannot be effectively prevented, and when it is more than 30% by weight, the bonding strength of the cement matrix cannot be obtained, and shear fracture becomes remarkable and the weight reduction corresponding to the addition cannot be achieved. Perlite or the like is used as the inorganic lightweight aggregate.

Further, as an organic lightweight aggregate, the particle size is 0.3 to 1.
The reason why the thermoplastic synthetic resin pulverized product crushed to 2 mm is used is that if the particle size is smaller than 0.3 mm, the sufficient buffering effect is not exhibited, and if it is larger than 1.2 mm, the bonding strength of the cement matrix decreases. This is because the phenomenon of springback becomes remarkable. As the organic lightweight aggregate, a foamed polystyrene crushed body, a foamed styrene crushed body, or the like is used.

Then, the addition amount of the above organic lightweight aggregate is 1
If the amount is less than 1% by weight, the effect of buffering the inorganic lightweight aggregate is lost, and if the amount is more than 5% by weight, the addition amount of the inorganic lightweight aggregate must be relatively small. This is because the springback phenomenon cannot be sufficiently prevented.

After extrusion molding with these compounding materials, the product is cured by an autoclave. The organic lightweight aggregate added by the heat at this time decomposes or melts and adheres to the inner surface of the cavity or the like to contribute to the formation of a foamed structure of the product and to impart water absorption resistance.

[0012]

EXAMPLES Next, examples of the present invention will be described. 40% by weight of cement, 40% by weight of silica sand, 13% by weight of fine aggregate, and 7% by weight of pulp fiber are added to the total 100% by weight. was added grinding bodies of particle size shown in Table 1 margin at grinding bodies of expanded polystyrene as a system lightweight aggregate, the plate having a thickness of 1.2cm width 10cm with the addition of water the extrusion pressure 15 kg / cm ² in the compounding materials Was extruded.

[0013]

[Table 1] A: 50 to 80% for particle size 0.3 to 0.6 mm and 2% for particle size 0.6 mm or more
Less than or equal to 0.3 mm and less than 10% B ... Grain size 0.6 to 1.2 mm is 50 to 80% and 1.2 mm or more is 1%
20% to 40% below 0.15 to 0.3 mm C ... 50 to 80% particle size 0.6 to 1.2 mm and 20 to 1.2 mm or more
40% D ... 50 to 80% for particle size 0.3 to 0.6 mm and 10 to 0.3 mm or more
50%

Then, the above plate-shaped molded body is heated at 140 ° C to 180 ° C.
After performing autoclave curing at high temperature, the bending strength, the specific gravity, and the nailing ability to test the presence or absence of cracking by driving a nail into the corner of the test plate 20 × 20 mm, and the surface smoothness were tested. The results are shown in. In addition, Table 1
In the figure, the unit of the numerical value in the bending strength column is kg / cm ² , and the fraction in the nailing property column is the percentage of the intact one in which cracking and chipping did not occur. The surface smoothness was evaluated as ◯ when the surface of the test piece was smooth, and as x when unevenness due to springback occurred.

As is clear from Table 1, in the examples of the present invention, the springback phenomenon is effectively suppressed by the cooperation of the organic lightweight aggregate and the inorganic lightweight aggregate, and the surface condition is smooth in both cases. In contrast to all the good ones, the comparative ones had a poor surface condition. Also,
It was found that a flexural strength comparable to that of the comparative example and a low specific gravity were obtained, and particularly nailing workability was excellent.

[0016]

As described above, according to the method for manufacturing a lightweight inorganic building material of the present invention, the inorganic lightweight aggregate and the organic lightweight aggregate are jointly used in spite of molding the product by extrusion molding. It is possible to effectively make the matrix structure a porous structure without impairing the strength, and as a result, it is possible to manufacture a lightweight inorganic building material that is lightweight and has excellent strength and extremely excellent workability such as nailability. Of.

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Claims (1)

[Claims] 1. An inorganic lightweight aggregate is ground to 10 to 30% by weight, and an organic lightweight aggregate is pulverized to a particle size of 0.3 to 1.2 mm with respect to 100 parts by weight of a mixture of cement, a siliceous raw material, and reinforcing fibers. 1 to 5% by weight of crushed thermoplastic synthetic resin,
A method for producing a lightweight inorganic building material, which comprises kneading with water and extruding into a product shape under an extrusion pressure of 15 kg / cm ² or less, and subjecting the formed body to autoclave curing.