JPH0446043A - Wall plastering admixture for building - Google Patents

Abstract

PURPOSE:To prevent the adverse effect on the human body and cracking of the wall by incorporating a small-diameter granular insulator powder consisting of an expanded cross-linked PVC resin having a specified grain diameter into the admixture. CONSTITUTION:This admixture contains a small-diameter granular insulator powder consisting of an expanded cross-linked PVC resin having <=1mm grain diameter. Since the admixture contains the granular insulator powder of an expanded cross-linked PVC resin, the human body is not adversely affected by the powder. Furthermore, as the powder has a relatively small grain diameter, the grains are appropriately mixed, and sufficient fluidity is secured even if a relatively small amt. of kneading water is used. Consequently, the shrinkage factor is reduced when the mortar is dried, cracking is hardly caused, and the strength of the mortar is comparatively 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 fire resistance, crack prevention properties, strength, workability for wall coating with mortar, etc., and can also be used in the final coating process.

In cement mortar for plastering, aggregate is mixed with cement 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 based on Styrofoam granules that act as aggregates.

However, such admixtures have been thought of as mere bulking agents, but they also improve fire resistance, crack prevention, strength, and mortar wall coating workability (specifically, , the ability to bite into the substrate, and the ability to spread with a trowel) were not given much consideration.

Recently, various attempts have been made to improve the properties of admixtures in order to improve the properties of this 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, since conventional wall coating admixtures used synthetic resins with relatively large particle sizes as aggregates, large amounts of mixing water were required to ensure the desired fluidity. As a result, the shrinkage rate of the mortar is large when it dries, and in fact, there is a high possibility that cracks will occur, and the strength of the mortar is relatively 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.

In addition, to apply wall coating with mortar, it is necessary to perform several steps such as undercoating, intermediate coating, and finishing coating, but conventional wall coating admixtures contain relatively large particles of resin powder. Although it can be used as an undercoat or intermediate coat, it has the disadvantage that it cannot be used as a finish coat because the resin powder is exposed on the surface and roughens the wall surface.

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, an admixture that has excellent functions as an aggregate. To provide a wall coating admixture for buildings that exhibits excellent properties, has no risk of adverse effects on the human body, has excellent crack prevention properties, strength, and workability for wall coating with mortar, and can also be used in the finishing coating process. The purpose is to

Summary of the Invention In order to achieve the above object, the building wall coating admixture according to the present invention is characterized in that it contains small-diameter granular insulation material powder made of cross-linked vinyl chloride resin foam with a particle size of 1 mm or less. It is said that

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 dusting powder has a relatively small particle size, the particles are mixed appropriately, and even with a relatively small amount of kneading water,
Sufficient liquidity will be ensured. As a result, when the mortar shrinks during drying, the shrinkage rate is small, the possibility of cracking 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.

In addition, since the granular insulation powder has a relatively small particle size of 11 DI or less, when an admixture containing this insulation material is mixed with cement and applied with mortar, it can be applied not only as a base coat or intermediate coat but also as a finishing coat. It can also be used as

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 building wall coating admixture according to an embodiment of the present invention comprises a granular insulation powder and preferably a powdered adhesive.

First, granular insulation powder will be explained.

The shape of the granular heat-insulating powder is not particularly limited, and may be, for example, approximately spherical, elongated, cubic, flaky, or a mixture thereof.

Such a granular insulating powder consists of a powder of pre-contained cross-linked polyvinyl chloride resin foam.

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

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.

The particle size of the particles of such small diameter granular heat insulating material powder is 1 mm or less, preferably 0.3 to 0.6 mm.

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 = 1/1.03 to 1/1.1; The volume ratio of the powdered adhesive is: powdered adhesive/total volume of admixture=3/100 to 10/100.

Furthermore, the volume ratio of admixture to cement is admixture/cement=1.03:1 to 1.1/1.

When the admixture of the present invention is mixed with cement and water and applied to the base of a building as an undercoat cement mortar and dried, the granular heat-insulating powder as an aggregate will not be exposed in an embossed manner. . Therefore, there is no need for finishing coat.

Since this granular heat-insulating powder has the above-mentioned physical properties, it can exhibit sufficient fire resistance without adversely affecting the human body. Furthermore, this granular heat-insulating dusting powder has particles mixed appropriately, and sufficient fluidity is ensured even with a relatively small amount of mixed water. As a result, when the mortar shrinks during drying, the shrinkage rate is small, the possibility of cracking 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, with regard to the workability of mortar for wall coating, since the admixture contains a powdered adhesive that functions as a thickener, sufficient adhesion to the base is ensured. In addition, this powdered adhesive allows water and cement to penetrate easily, is kneaded uniformly, improves fluidity, and ensures sufficient elongation with a trowel. Furthermore, this powdered adhesive can also prevent the admixture from scattering due to wind.

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 building wall coating admixture according to the present invention contains granular heat-insulating powder made of cross-linked vinyl chloride resin foam. No adverse effects.

In addition, since the granular insulation dusting powder has a relatively small particle size, the particles are mixed appropriately, and even with a relatively small amount of kneading water,
Sufficient liquidity will be ensured. As a result, when the mortar shrinks during drying, the shrinkage rate is small, the possibility of cracking 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.

In addition, since the granular insulation powder has a relatively small particle size of 1 m or less, when the admixture containing this insulation material is mixed with cement and applied with mortar, it can be applied not only as a base coat or intermediate coat but also as a finishing coat. It can also be used as

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.

[Examples] The present invention will be described below 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 (
A mixture of small diameter granular insulation powder (manufactured and sold by Kanebuchi Kagaku Kogyo ■) with an average particle size of 0.4 ml (manufactured and sold by Kanebuchi Chemical Industry ■ through technical cooperation with KRP Plastics, France), 31 ml of cement, and approximately 1.2 ml of water. were mixed to obtain cement mortar.

Comparative Example 1 As an admixture, "Kregesel" with an average particle size of 4 mm was used, and this admixture 31, cement 31, and 1.21 parts of water were mixed to obtain a cement mortar.

Comparative Example 2 To 2.251 ml of large-diameter heat-insulating powder with an average particle size of 4 cm made of "Kregesel", 1.51 ml of cement and about 0.0 ml of water were added.
．． 61 to obtain cement mortar.

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

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

Claims (1)

[Scope of Claims] 1) A wall coating admixture for buildings, characterized in that it contains small-diameter granular heat-insulating material powder made of cross-linked vinyl chloride resin foam with a particle size of 1 mm or less. 2) The building wall coating admixture according to claim 1, further comprising a powder adhesive.