JPS59141455A - Manufacture of lightweight cement hardened 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] 1. Technical field] Kizari is a method for producing a hardened bone cement product in which thermoplastic 8 is bound with foamed fat particles and all aggregates.

[Background Art] In the case of lightweight cementite hardened materials using foamed thermoplastic resin particles as aggregate, such as expanded styrene heat, the foamed thermoplastic resin particles Lll and the cement matrix (2) have poor compatibility, as shown in Figure 1. Thermoplastic resin foam particles (
There is a void (3) between 1) and the semesite matrix (2).
This caused poor adhesion between the two, and the abrasive eaves cement had the problem of high water absorption and low strength. Therefore, in order to improve the compatibility between the foamed thermoplastic resin particles and hydraulic cement, and to improve the adhesion between the foamed thermoplastic resin particles and the cement matrix,
Publication No. 719, Publication No. 47-28683, Publication No. 4Gl-
No. 11725, No. 50-36853, No. 54
Various methods have been proposed for pre-treating expanded thermoplastic resin particles, such as in Japanese Patent No. 11814. However, all of the above methods have problems in terms of production efficiency because they require two steps: 111 treatment of thermoplastic 'sI foamed particles and a step of mixing them with hydraulic cement♂. This method has problems in that it requires a large amount of admixture, resulting in high costs and insufficient effects.

(Object of the Invention) The present invention has been made in consideration of the above points, and it is possible to maintain a low water absorption rate without increasing the number of manufacturing steps or using a particularly large amount of admixture gold. It is an object of the present invention to provide a method for producing a light-tt mesitocured product that can be produced and improved in strength.

(Disclosure of the Invention) Accordingly, the method for producing a lightweight hardened cement body of the present invention involves kneading hydraulic cement with foamed thermoplastic resin particles and a solvent in which the foamed thermoplastic resin particles are soluble. This invention is characterized by curing and hardening, and the present invention will be described in detail below.

As the hydraulic cement, paste or mortar such as Holtland cement, alumina cement, and Macnesia cement can be used. It's okay. Then, this hydraulic cement is mixed with thermo-oJ plastic foam particles, a solvent, and other additives used as necessary.

The foamed thermoplastic resin particles are not particularly limited, but foamed styrene peas are often used. The solvent used is one that dissolves the foamed thermoplastic resin particles, such as a fatty acid ester. As this solvent, it is preferable to select and use one with a boiling point of 100° C. or higher so that it will not be easily evaporated due to the heat generated during kneading and curing. And the amount of solvent is thermoplastic resin.

'C000 for 100 foam particles (apparent capacity)
1 to 20 parts by volume is suitable. If it is less than 0.01 parts by volume, the effect of achieving the object of the present invention will not be sufficient, and if it exceeds 20 parts by volume, the thermoplastic resin foam particles will be
This is undesirable because it causes shrinkage if it is heated too much. Mixing -1 Hydraulic cement, foamed thermoplastic resin particles, and all solvents are mixed and kneaded.
r: After mixing, mix this mixture with the hydraulic cement and mix it, or optionally adjust the blending amount of the thermoplastic resin foam to the hydraulic cement.
It is appropriately set depending on the desired density of the cured product.

The kneaded mixture is V-cured and cured using a conventional method to obtain a lightweight cementite hardened metal. It may also be made of foam or melted.

However, in the lightweight cement hardened body obtained as described above, the surface of the foamed thermoplastic resin particles (1) is swollen or dissolved by the solvent, so this swelling or dissolution occurs. [4] becomes a boundary layer between the thermoplastic paulownia foam particles (IL+) and the cement matrix (2) as shown in Figure 2, and improves the adhesion between the thermoplastic resin foam particles (1) and the cement matrix (2). It is something that can be improved.

The invention will now be illustrated by Example VCX.

<Example> Portland cement convex OOy has an apparent specific gravity of 0°020
← Polystyrene foam 300 with a small diameter of 2 to 4 mm
2.Water LIOy,, canter help? methyl nisdel by all rx
The mixture was mixed and stirred for 5 minutes in a rotary stirrer. This kneaded product was filled into a mold of f 60 x 90 x 5 cm, left to stand for 24 hours, and then cured under moist heat for 24 hours at 60°C to obtain a lightweight hardened cement body.

<Comparative Example 1> Examples 1 and 11 except that fatty acid methyl ester was not added.
) A lightweight cemeshito cured body was obtained in the same manner as J.

<Example 2> 25 oy of Portland cement has an apparent specific gravity of 0.012
5002 polystyrene foam beads with a diameter of 2 to 4M.
, 50 y of silica sand with a particle size of 100 mesh or less, 150 y of water
and fatty acid ethyl ester were mixed and stirred for 5 minutes in a rotary 30-meter, and this kneaded product was filled into a 60 x 90 x 5 cm mold, and heated at 180°C for 10 minutes.
A lightweight cemeshite hardened body was obtained by autoclave curing under the condition of time τ′.

Comparative Example 2> A lightweight cement hardened body was obtained in the same manner as in Example 2, except that the fatty 1-functional methyl ester was not entirely blended.

Regarding the lightweight cement hardened bodies obtained in Example 1.2 and Comparative Example 1.2 above, pressure assembly strength (5X5X5cm/pull), bending strength (4X4X16cnr sample, spacer Ocm), water absorption The paper was immersed in VC water for 24 hours, and the total increase in volume was measured and the outer paper 1 was observed on the torn surface.

As a result of the above table, J:v, the material of Example 1 was found to have the same strength and water absorption as that of Comparative Example 1, and the material of Example 2 which also used Maruko silica sand had the same strength and water absorption as that of Comparative Example 1. The one in Example 1, c! l
The water absorbency was dramatically improved. Furthermore, it is confirmed from the appearance of the fractured surface that Example 1.2 has better adhesion between the foam beads and the cement matrix than Comparative Example 1.2.

[Object of the invention] As described above, according to the unexploded Ell''IK, the adhesion between the cement matrix and the thermoplastic resin foam particles can be improved by using a solvent that dissolves the thermoplastic resin foam particles, and the number of manufacturing steps is reduced. This makes it possible to lower the water absorption of a lightweight cement hardened body and to improve its strength, without having to particularly increase rJf or use a large amount of admixtures.

4.Drawing No.1\I)r+1. Figure 1 is an enlarged cross-sectional view of a hardened cement body in a conventional example.
FIG. 2 is an enlarged sectional view of the hardened cement body in the case of "non-explosion", in which il+ is the thermoplastic resin foamed particle 1 (2) is the cement matrix, (3) is the void, and (4) is the layer.

Psychologist Patent Attorney Ishi 1) Chief Figure 1 stomach 30

Claims (1)

[Claims] ill A method for producing a lightweight hardened cement product, which is characterized by kneading foamed thermoplastic resin particles and a solvent in which the foamed thermoplastic resin particles are soluble in hydraulic cement, and curing and curing the mixture.