JPH0446041A - Wall plastering admixture for building - Google Patents

Abstract

PURPOSE:To prevent the adverse effect on the human body and cracking of the wall by using an expanded PVC-based resin contg. an asbestos-free inorg. filler for one of the large and small-diameter granular insulator powders and an expanded cross-linked PVC resin for the other. CONSTITUTION:This wall plastering admixture consists of a large-diameter granular insulator powder having 2-10mm grain diameter and a small-diameter granular insulator powder. One of the powders consists of an expanded PVC- based resin contg. an asbestos-free inorg. filler or an expanded resin consisting essentially of a chlorinated PVC resin, and the other consists of an expanded cross-linked PVC resin. Since the admixture contains the granular insulator powder consisting of a quasi-incombustible material or better, the human body is not adversely affected by the admixture, and sufficient fire resistance is exhibited, As the admixture has two kinds of grain diameters, the gap between the grains is diminished in size, miscibility between the grains is improved as the weights per volume of both materials differ from each other, sufficient fluidity is secured, the shrinkage factor is reduced, and the wall is hardly cracked.

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, and workability for wall coating with mortar.

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 of kneading, there is a tendency for cement to be mixed with admixtures based on granulated Styrofoam particles that act as aggregates.

However, such admixtures were thought of as mere bulking agents, and were considered important properties of mortar, such as fire resistance, anti-cranking properties, strength, and mortar's wall coating workability (specifically, Not much consideration was given to the ability to bite into the base material and the ability to spread with a trowel.

Recently, various attempts have been made to improve the properties of admixtures in order to improve the properties of this mortar.

For example, since the above-mentioned Styrofoam has extremely poor fire resistance, it has been proposed to mix granules of fire-resistant foamed asbestos calcium carbonate into the admixture (
(Special Publication No. 59-34144).

However, in recent years, the use of materials made of asbestos has been discouraged due to concerns that it may have an adverse effect on the human body. Therefore, the above-mentioned proposal is impractical.

It has also been proposed that the above-mentioned asbestos calcium carbonate foam be sawed to produce granules with a particle size similar to that of sawdust, and that this be used as the main material of the admixture (Japanese Patent Publication No. 62-561
Publication No. 14). This not only improves fire resistance, but also
Since the granules have elasticity, the granules also shrink during drying and shrinkage of the mortar, which is said to prevent the occurrence of cracks.

However, the particle size of this granular material is relatively large, and a relatively large gap is formed between the particles of the granular material. Therefore, a large amount of kneading water is required to ensure predetermined fluidity.

As a result, the mortar had a large shrinkage rate when drying, and in fact, there was a high possibility of cracking, and the strength of the mortar was relatively weak.

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. The object of the present invention is to provide a wall coating admixture for buildings that has a certain degree of fire resistance without adversely affecting 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 with a particle size of 2 to 10 mm and a particle size of 0.1 to 1.5 mm. and a small-diameter granular heat-insulating powder, and either the large-diameter granular heat-insulating powder or the small-diameter heat-insulating powder contains a vinyl chloride-based resin foam or a chlorinated vinyl chloride-based powder containing an asbestos-free inorganic filler. It is characterized in that it is made of a resin foam whose main component is a resin foam, and one of the two is made of a crosslinked vinyl chloride resin foam.

The resin foam is preferably made of a semi-nonflammable or higher resin foam that is manufactured by containing a large amount of an inorganic filler.

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

The admixture according to the present invention includes a granular heat-insulating dusting powder made of a material that is preferably semi-nonflammable or more and whose main component is a vinyl chloride resin foam or a chlorinated vinyl chloride resin foam, This granular heat-insulating powder can exhibit sufficient fire resistance without adversely affecting the human body.

In addition, since the granular insulation powder has two types of particle sizes,
The particles are mixed properly and the gaps between the particles become smaller. Moreover, the weight per unit volume of the resin foam is 100 to 150.
kg/n (and the weight per unit volume of the crosslinked vinyl chloride resin foam is 30 to 40 kg/-, and since the weights per unit volume are different, the mutual miscibility of the particles is improved in this respect as well.

Therefore, sufficient fluidity is ensured even with a relatively small amount of kneading 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.

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 weights per unit volume, 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. .

At least one of the large-diameter granular insulation material powder and the small-diameter granular insulation material powder is, for example, a pulverized product of a noncombustible resin foam product, preferably semi-inflammable or higher, made of the materials described below, or More preferably, it is a pulverized product of cutting waste or surplus material generated during the production of nonflammable resin foam products. Nonflammable resin products made of the materials described below can be obtained by first forming a preform and then cutting it into a predetermined shape, or at that time, a large amount of cutting waste and surplus material are generated. Therefore, it is particularly preferred industrially to use the cutting waste and the crushed portion obtained by crushing the remaining material El as granular heat-insulating powder because it eliminates waste of materials and is economical. In this case, the granular heat-insulating powder is a mixture of granules having various shapes such as flakes and approximately spheres.

Semi-nonflammable or higher in granular insulation dusting powder means semi-nonflammable or non-combustible, respectively.
Although stipulated in No. 8, in the present invention, a resin whose main component is a vinyl chloride resin foam containing an inorganic filler or a chlorinated vinyl chloride resin foam is used as a semi-nonflammable or higher granular insulation powder. A finely ground material, preferably a foam thereof, is used.

For example, the heat insulating powder made of foam as described above has a compressive strength of 2.3 kg/cT1 or more, a bending strength of 3.0 kg/clI1 or more, and has excellent mechanical strength. The heat transfer coefficient is 0. 04 kcal/m -h+・℃ or less, excellent heat insulation, water absorption rate of O, Ig/100o (or less), excellent water resistance, moisture permeability coefficient of 0.03 g/all-bt- e+a+H
g or less, and the moisture resistance is also excellent.

The vinyl chloride resin (hereinafter referred to as PvC) used in the semi-nonflammable or higher granular insulation powder is polyvinyl chloride alone or chlorinated vinyl chloride-vinyl acetate copolymer containing 50% by weight or more of vinyl chloride. Vinyl copolymers or their combination with thermoplastic polyurethane, acrylonitrile
Butadiene copolymer, chlorinated vinyl chloride resin, chlorinated polyethylene, methacrylic ester (acrylic ester copolymer, ethylene-vinyl acetate copolymer, vinyl chloride-vinylidene chloride copolymer, etc.) Compatible with polyvinyl chloride It is a mixture with at least one kind of resin having polyvinyl chloride, and the polyvinyl chloride content in the mixture is 50% by weight or more.

On the other hand, chlorinated vinyl chloride resin (hereinafter referred to as CP'IC) is a resin for blending that is compatible with CPVC, including only resins obtained by chlorinating the PVC, such as:
Vinyl chloride resin, vinyl chloride-vinyl acetate copolymer, thermoplastic polyurethane, acrylonitrile-butadiene copolymer, chlorinated polyethylene, methacrylic acid ester
It is a mixture with at least one of acrylic acid ester copolymer, ethylene-vinyl acetate copolymer, vinyl chloride-vinylidene chloride copolymer, etc., and the amount of blending resin in the mixture is 50% by weight. % or less.

As the vinyl chloride resin to be chlorinated, in addition to PVC as described above, a copolymer containing 50% by weight or more of a vinyl chloride resin can also be used.

The chlorination method may be any conventionally known method, and for example, a photochlorination method under ultraviolet irradiation is suitably used.

Examples of the inorganic filler contained in the granular heat-insulating powder include inorganic fibrous materials and inorganic granular materials.

Among these, inorganic fibrous materials have a good volume retention effect when exposed to high temperatures.

This is because the inorganic fibrous material is intertwined with each other to form a network in the foam, and is therefore presumed to have excellent shape stability.

Examples of the inorganic fibrous material include glass fibers having an average fiber length of 1 μm or more, preferably about 10 μm to 50 mm;
Rock wool, glass fiber, ceramic fiber, alumina fiber, carbon fiber, quartz fiber, boron fiber, various metal fibers,
Examples include various types of whiskers, and these fibers may be used alone or in combination of two or more types. However, when foaming a resin containing these inorganic materials, rock wool is most preferable from the viewpoints of ease of foam molding, properties of the resulting foam, safety to the human body, cost, etc. In addition, suitable inorganic granules include talc, calcium carbonate, aluminum hydroxide, magnesium hydroxide, zinc oxide, mica, hentonite, clay silica, etc. with an average particle diameter of 0.01 to 300 μm, preferably about 0.1 to 100 μm. It is.

Furthermore, hollow bodies such as whitebait balloons can also be used as the inorganic particulates.

These inorganic fillers may be used alone or in combination of two or more.

The content of such an inorganic filler is determined by considering the amount to be contained in the resin material, the expansion ratio and cost when foaming the resin material, but usually PVC and/or CPVC, 00 parts by weight. On the other hand, the amount of inorganic fibers is desirably 2 parts by weight or more, preferably 5 parts by weight or more, and more preferably 10 parts by weight or more. For inorganic particulates, the amount is 198 parts by weight or more, preferably 300 parts by weight or more. As the content of the inorganic filler increases, the obtained granular heat-insulating powder approaches non-flammability from semi-nonflammability.

The PVC foam or CPVC foam used as the semi-inflammable or higher granular heat-insulating powder of the present invention can be highly foamed by using a specific solvent and containing a large amount of rock wool, etc., which does not pose any sanitary problems. It is manufactured by the method disclosed in, for example, International Application No. PCY/IP89100362 filed by the same applicant as JP-A No. 63-264645.

When foaming these resin materials containing inorganic fillers, the expansion ratio is preferably 50 times or more, and when considering the amount of heat generated during combustion, the amount of smoke generated, and economic efficiency, a higher expansion ratio may be used. It is desirable that the foam has
Preferably it is 60 times or more, more preferably 80 times or more. However, if the expansion ratio exceeds 200 times, it is difficult to produce a normal foam, and even if a good foam is obtained, the physical properties such as strength will be insufficient, so the expansion ratio should be less than 200 times. It is preferable that

The density (weight per unit volume) of the nonflammable resin foam thus obtained is 100 to 150 kg/d.

Resin materials, especially foams, used to make up semi-nonflammable or higher granular heat-insulating powder have superior performance compared to glass wool, etc., in terms of thermal conductivity, compressive strength, water absorption, and workability. It also exhibits excellent heat insulation and fire resistance.

At least one of the large-diameter granular heat-insulating powder and the small-diameter granular heat-insulating powder is made of a cross-linked vinyl chloride resin foam powder produced by a manufacturing method different from the above-mentioned manufacturing method.

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.

The density (weight per unit area) of the crosslinked vinyl chloride resin thus obtained is 30 to 40 kg/d.

Among such large-diameter granular insulation material powder and small-diameter granular insulation powder, the particle size of the large particles is 2 to 10 mm.

The particle diameter of the small particles is preferably 0.1 to 1.5 mm, preferably 0.3 to 1.21 mm.
It is. The ratio of large-diameter particles to small-diameter particles is large-diameter particles:small-diameter particles -55 to 8.2, preferably 3.
:1 degree.

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 as follows: 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 above-mentioned physical properties, it can exhibit sufficient fire resistance without adversely affecting the human body. Furthermore, since this granular heat-insulating powder has two types of particle sizes and two types of density, the particles are appropriately mixed, and the gaps between the particles are reduced. Therefore, sufficient fluidity can be ensured even with a relatively small amount of kneading water.

As a result, when the mortar shrinks during drying, the shrinkage rate is small, reducing the possibility of cracking and making the mortar relatively strong. in this way,
Granular insulation powder can exhibit excellent functions 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 can exhibit sufficient fire resistance without adversely affecting the human body due to the granular heat insulating powder. Also,
This granular insulation powder has two types of particle sizes and two types of density, so when the mortar dries and shrinks, its shrinkage rate is small, which reduces the possibility of cracking and increases the strength of the mortar. can also be made relatively strong. In this way, the granular heat insulating material powder can exhibit an excellent function as an aggregate. Furthermore, regarding the workability of mortar wall coating, the powdered adhesive with the function of a thickener ensures sufficient adhesion to the base, and the granular insulation powder has two particle sizes. This ensures sufficient fluidity and sufficient elongation with a trowel.

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

Example 1 "Varilac" (manufactured by Kanebuchi Chemical Industry ■; registered trademark) made of a semi-nonflammable or higher foam material whose main component is asbestos-free inorganic filler-containing vinyl chloride resin or chlorinated vinyl chloride resin. large-diameter granular insulation material powder 2 with an average particle size of 4-
, 11, and "Kregesel" (manufactured and sold by Kanebuchi Chemical Industry Co., Ltd. through technical cooperation with France's KRP Plastics), which is made of cross-linked vinyl chloride resin foam. 0.91 was first prepared. Add 31 parts of cement and 1 part of water to these insulating powders.
．． 21 to obtain cement mortar.

Reference Example 1 As an admixture, "Varilac" milled adhesive with an average particle size of 0.3 m/rn was used, and this admixture 31 and cement 3
1 and 1.21 parts of water were mixed to obtain cement mortar.

Comparative Example 1 Large-diameter granular insulation powder 2 made by "Varilac" with an average particle size of 4 embryos
．． 251, 1.51 part of cement, and about 0.61 part of water were mixed to obtain cement mortar.

Evaluation value (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 Either the powder or the small-diameter granular insulation material powder is made of a vinyl chloride resin foam containing an asbestos-free inorganic filler or a resin foam whose main component is a chlorinated vinyl chloride resin foam. or the other is made of a cross-linked vinyl chloride resin foam. 2) The building wall coating admixture according to claim 1, further comprising a powder adhesive. 3) The wall coating admixture for buildings according to claim 1 or 2, wherein the resin foam is made of a material that is quasi-nonflammable or higher.