JPH0446042A - Wall plastering admixture for building - Google Patents

Abstract

PURPOSE:To prevent the adverse effect on the human body and cracking of the wall by forming the admixture having large and small-diameter granular insulator powders from an expanded cross-linked PVC resin. CONSTITUTION:The wall plastering admixture has a large-diameter granular insulator powder having 2-10mm grain diameter and a small-diameter granular insulator powder, and the insulator powders are formed from an expanded cross-linked PVC resin. Since the admixture contains a granular insulator powder consisting of the expanded cross-linked PVC resin, the human body is not adversely affected by the admixture, and the gap between the grains is diminished in size as the admixture has two kinds of grain diameters. Consequently, sufficient fluidity is secured even if a relatively small amt. of kneading water is used, the shrinkage factor is reduced when the mortar is dried, the wall is hardly cracked, and the strength of mortar is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a wall coating admixture for buildings, and in particular exhibits excellent functionality as an aggregate when mixed with cement and used as cement mortar. This invention relates to a wall coating admixture for buildings that has excellent crack prevention properties, strength, mortar wall coating workability, etc.

Technical Background of the Invention In cement mortar for plastering, aggregate is mixed with cement in order to maintain its shape. This aggregate traditionally has
Natural sand has been used, but in recent years, due to the depletion of sand sources,
Instead, there is a tendency for cement to be mixed with admixtures mainly consisting of styrofoam granules that act as aggregates (
(Japanese Unexamined Patent Publication No. 1983-6328).

However, such admixtures were thought of as mere bulking agents, and they were considered important properties of mortar, such as crack prevention, strength, and mortar wall coating workability (specifically, the ability to coat the base). Little consideration was given to the biting properties and troweling properties. Therefore,
Recently, various attempts have been made to improve the properties of admixtures in order to improve the properties of mortar.

For example, Japanese Unexamined Patent Publication No. 59-35861 discloses a construction admixture in which the surface of a synthetic resin foam used as an aggregate is made into open cells to improve the workability of mortar for wall coating. .

However, conventional wall coating admixtures used synthetic resin with one type of relatively large particle size as aggregate;
In order to ensure the desired fluidity, a large amount of kneading water is required, and as a result, the shrinkage rate of the mortar is large when it dries, and in reality, the possibility of cracking is high, and the strength of the mortar is relatively low. It has the disadvantage of being weak.

In addition, wall coating admixtures containing asbestos or glass fiber have been developed to improve crack resistance, but in recent years materials made from asbestos have been shown to have negative effects on the human body. There is a tendency for its use to be discouraged due to concerns. Further, glass fibers have the disadvantage that they tend to get stuck in the hands of workers and have poor workability.

From the above, various attempts have been made to improve the individual properties of admixtures, but nothing suitable as an admixture for mortar from all viewpoints has been provided.

Purpose of the Invention The present invention was made in view of the above circumstances, and provides a wall coating admixture for buildings that is suitable from all points of view, and more specifically, exhibits excellent functionality as an aggregate. However, the object of the present invention is to provide a wall coating admixture for buildings that does not have an adverse effect on the human body, has excellent crack prevention properties, strength, and workability for wall coating with mortar.

SUMMARY OF THE INVENTION In order to achieve the above object, the building wall coating admixture according to the present invention comprises a large-diameter granular insulation powder having a particle size of 2 to 10 mm, and a particle size of 0.1 to 1 mm. 5 m of small-diameter granular heat-insulating material powder, and the large-diameter granular heat-insulating material powder and small-diameter granular heat-insulating material powder are made of crosslinked vinyl chloride resin foam.

The admixture according to the present invention may contain a powdered adhesive.

Since such an admixture according to the present invention contains a granular heat-insulating powder made of a crosslinked vinyl chloride resin foam, this granular heat-insulating powder does not have an adverse effect on the human body.

In addition, since the granular insulation powder has two types of particle sizes,
The particles are mixed appropriately, and the gaps between the particles are reduced. Therefore, sufficient fluidity is ensured even with a relatively small amount of kneading water. As a result, when the mortar dries and shrinks, the shrinkage rate is small, reducing the possibility of cracking, and
The strength of the mortar can also be made relatively strong. In this way, the granular heat-insulating powder can exhibit an excellent function as an aggregate.

In addition, regarding the workability of wall coating with mortar, since the granular heat insulating material is composed of two types of particle sizes, fluidity is sufficiently ensured and workability of troweling is improved.

In particular, if a powdered adhesive having a function as a thickener or a spreading agent is mixed into the admixture, the adhesion to the substrate is further improved. In addition, due to the function of this powdered adhesive as a spreading agent, it is easily compatible with water and cement, is kneaded uniformly, and further improves fluidity.

DETAILED DESCRIPTION OF THE INVENTION The wall coating admixture for buildings according to the present invention will be specifically described below.

A wall coating admixture for a building according to an embodiment of the present invention includes two types of granular heat-insulating powder having different particle sizes and preferably a powder adhesive.

First, the granular insulation powder will be explained.

The large-diameter granular insulation material powder and the small-diameter granular insulation material powder are not particularly limited in their individual shapes; for example, they may be approximately spherical, elongated, cubic, flaky, or a mixture thereof. .

Such large-diameter granular insulation powder or small-diameter granular insulation powder consists of - a powder of a predetermined crosslinked vinyl chloride resin foam;

The vinyl chloride resin used in the present invention refers to polyvinyl chloride alone, a vinyl chloride copolymer containing 50% by weight or more of vinyl chloride, or a combination thereof with vinyl chloride-vinyl acetate copolymer, thermoplastic polyurethane, acrylonitrile-butadiene. Compatible with polyvinyl chloride, such as copolymers, chlorinated vinyl chloride resins, chlorinated polyethylene, methacrylic ester-acrylic ester copolymers, ethylene-vinyl acetate copolymers, vinyl chloride-vinylidene chloride copolymers, etc. A mixture with at least one type of resin, in which the polyvinyl chloride content is 50% by weight or more, or a mixture in which a small amount of stabilizer, colorant, plasticizer, etc. is added to these mixtures. etc. are exemplified.

Methods for crosslinking and foaming such vinyl chloride resin include, for example, Japanese Patent Publication No. 39-1827 and Japanese Patent Publication No. 4
As shown in Publication No. 4-8737, the vinyl chloride resin and diisocyanate (or polyisocyanate)
, a blowing agent, if necessary an unsaturated acid anhydride, and a hydrocarbon having one or two cyclic double bonds are mixed together, the mixture is put into a mold under a predetermined pressure, heated, and the mixture is heated under pressure. There is a method of producing a crosslinked vinyl chloride resin foam by cooling the mold, taking out the contents, and foaming by heating in the presence of water or steam. Any known method can be applied to produce the crosslinked vinyl chloride resin particles.

Among such large diameter granular heat insulating material powder and small diameter granular heat insulating material powder, the particle size of the large particle is 2 to 1 m, preferably 3.0 to 6. Om, and the particle size of small particles is 0
．． 1 to 1.5 g, preferably 0.3 to 1.2 m.

The ratio of large-diameter particles to small-diameter particles is preferably large-diameter particles: small-diameter particles = 5:5 to 8:2, and more preferably about 3.1.

Next, the powdered adhesive will be explained.

This powdered adhesive is attached to each particle of the granular heat-insulating powder, and polyvinyl alcohol, methylcellulose, carboxymethylcellulose, etc. are used as the powdered adhesive. This powder adhesive functions as a spreading agent and a thickening agent.

When this powdered adhesive is added to the granular insulation powder as an aggregate and stirred, the wall coating admixture according to the present invention is obtained. When this admixture is mixed with cement and water,
Cement mortar is obtained.

Here, the ratio of the volume of the granular heat-insulating powder to the total volume of the admixture is: Volume of the granular heat-insulating powder/total volume of the admixture = 1/2 to 3/4, and the ratio of the powder adhesive to the total volume of the admixture is The volume ratio of powder adhesive/admixture total volume = 3/100 to 10/100.

Furthermore, the volume ratio of admixture to cement is admixture:cement=11 to 3/1.

When the admixture according to the present invention is mixed with cement and water and applied to the base of a building as an undercoat cement mortar and dried, granular insulation powder as aggregate, especially large diameter granular insulation powder, floats out. It is exposed like a strip and has an uneven surface. Therefore, combing for topcoating becomes unnecessary.

Since this granular heat-insulating powder has the physical properties described above, it does not have any adverse effects on the human body. Furthermore, since this granular heat-insulating powder has a -2 type of particle size, the particles are appropriately mixed, and the gaps between the particles are reduced. Therefore, sufficient fluidity is ensured even with a relatively small amount of kneading water. As a result, when mortar dries and shrinks, its shrinkage rate is small;
The possibility of crack generation can be reduced, and the strength of the mortar can be made relatively strong. In this way, the granular heat-insulating powder can exhibit an excellent function as an aggregate.

Furthermore, regarding the workability of mortar for wall coating, since a powdered adhesive having a function as a thickener is mixed into the admixture, sufficient adhesion to the base is ensured. In addition, this powdered adhesive allows water and cement to easily soak in, and is uniformly kneaded, improving fluidity. Furthermore, since the granular heat-insulating powder has two types of particle sizes, sufficient fluidity is ensured, and sufficient elongation with a trowel is also ensured. Furthermore, this powdered adhesive can also prevent the admixture from scattering due to wind.

As described above, the present invention provides a wall coating admixture for buildings that is suitable from all viewpoints.

Note that the present invention is not limited to the embodiments described above, and can be variously modified within the scope of the present invention.

As described in detail, the wall coating admixture for buildings according to the present invention does not have any adverse effects on the human body due to the granular heat insulating powder. In addition, this granular insulation powder has two types of particle sizes, so when the mortar dries and shrinks, its shrinkage rate is small (the possibility of cracking can be lowered, and the strength of the mortar is also relatively high). In this way, granular insulation powder can exhibit an excellent function as an aggregate.Furthermore, with regard to the workability of wall coating with mortar, powdered adhesive with the function of a thickener can The agent ensures sufficient adhesion to the substrate, and the granular insulation powder has two different particle sizes, ensuring sufficient fluidity and sufficient elongation with a trowel. Ru.

[Examples] Hereinafter, the present invention will be explained based on more specific examples, but the present invention is not limited to these examples.

Example 1 "Kregecell" made of cross-linked vinyl chloride resin foam (
Manufactured and sold by Kanebuchi Chemical Industry Co., Ltd. through a technical partnership with KRP Plastics, France
First, large-diameter granular insulation powder 2.11 of Ilil and small-diameter granular insulation powder 0.91 with an average particle size of 0.3 mm, also made of "Kregesel", were prepared. A cement mortar was obtained by mixing 31 parts of cement and about 1.2 parts of water with these heat-insulating powders.

Reference Example 1 "Kresegel" with an average particle size of 0.3 mm was used as an admixture, and 31 parts of this admixture, 3 parts of cement, and 1.2 parts of water were mixed to obtain a cement mortar.

Comparative Example 1 A cement mortar was obtained by mixing 1.51 parts of cement and about 0.61 parts of water with 2.25 parts of large-diameter granular heat insulating material powder having an average particle diameter of 4 mm composed of "Kregesel".

Evaluation (1) The extensibility of the trowel using a plastering trowel was better in Example 1 than in Reference Example 1.

(2) The cement mortar of Comparative Example 1 contained a lot of powder and became dry, and when water was added, there was a risk of poor adhesion and cracking.

Patent applicant Kanebuchi Chemical Industry Co., Ltd.

Claims (1)

[Scope of Claims] 1) A large-diameter granular insulation material powder having a particle size of 2 to 10 mm and a small-diameter granular insulation material powder having a particle size of 0.1 to 1.5 mm, wherein the large-diameter granular insulation material A wall coating admixture for buildings, characterized in that the powder and the small-diameter granular insulation powder are made of cross-linked vinyl chloride resin foam. 2) The building wall coating admixture according to claim 1, further comprising a powder adhesive.