JPS61155472A - Paste for wall covering material - Google Patents

Abstract

PURPOSE:To obtain a paste which provides fiber wall covering materials having improved water resistance and has excellent workability during coating and excellent shelf stability, by mixing fine aluminum sulfate powder with carboxymethylcellulose. CONSTITUTION:A paste for wall covering materials is obtd. by mixing 0.5-5pts. wt. aluminum sulfate powder having such a particle size distribution that at least 90w% of powder is composed of particles having a particle size of 149mu or below, with 95-99.5pts.wt. carboxymethylcellulose. When aluminum sulfate powder contg. not less than 10% particles having a particle size exceeding 149mu (100-mesh) is used, the paste is rapidly thickened during kneading with water and caused to gol and large white grains are formed. After coating and drying, protrusions ar formed and failure in finishing is caused by said grains. Usually, the paste is previously mixed with a base material and water is kneaded with the mixture in situ. However, the paste may be mixed with other wall covering base material in situ.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention improves the water resistance of fiber wall materials based on sand or soil and fibrous materials such as pulp, wood flour, and cotton waste, and The present invention relates to a glue for wall materials that has excellent workability and preservation properties during storage.

(Prior Art) The interior and exterior materials of buildings, generally called fiber walls, are made of carboxymethyl cellulose (instead of conventional natural glues such as starch) for the purpose of bonding during painting, improving workability, and preventing rot. CMC (hereinafter abbreviated as CMC) is frequently used and is currently the main glue. The fiber material using CMC as the main glue is CM
Due to the easy solubility of C in water and the viscoelastic properties of its aqueous solution,
It is an excellent wall material that is very easy to work with such as cross-wiring and troweling, gives a natural wall finish, expresses the characteristics of the material well, and has a solidity suitable for residential use.

However, since CMC is characterized by being easily soluble in water, a fiber wall using CMC as a glue is very good in a dry place, but if it comes into contact with a wall surface that has absorbed moisture in a humid place, If you accidentally touch a part that has been covered with water, the part will become soft and fall off.

Since the early days when CMC began to be used as a glue for fiber walls, various methods of improvement have been taken to overcome this drawback, but none have yet been satisfactory. For example, using polyvalent metal salts such as aluminum salts and chromium salts,
Attempts have been made to impart water resistance by immobilizing CMC through a reaction between MC and polyvalent metal ions (% Kosho 50-364).
No. 49 and Japanese Patent Publication No. 47-24454, etc.). However, the use of aluminum sulfate, which has a high solubility, has the disadvantage that due to its rapid ionic reaction, it rapidly thickens and gels in the wall material mixed with water, making painting work difficult. . On the other hand, the use of chromium salts is not preferred due to its impact on environmental pollution.

In addition, when dried, oligomer powder containing CMC undergoes condensation polymerization to become a water-insoluble resin.
A method of mixing it with MC has also been proposed (Japanese Unexamined Patent Publication No. 5
0-10345). Since the oligomer powder used in this case is an intermediate resin, it is inherently unstable, and the reaction is often accelerated during storage due to moisture absorption (it inevitably loses viscosity and cannot be used as a sizing agent). It is of no use and often causes trouble.

On the other hand, in recent years, synthetic resin emulsions such as vinegared rice vinyl-based emulsions have been used in combination with CMC, and their water bathability and water resistance have become problematic due to sticky workability due to the viscosity of the resin emulsions. Therefore, it cannot be mixed into the powdered fiber wall material in advance, and it must be added separately during kneading before application, which is inconvenient. Furthermore, the wall surface has a glossy finish, making it difficult to form a flat, solid satin surface.

(Problems to be Solved by the Invention) The present inventor has developed a method that maintains the advantages of fiber wall materials using CMC as the main glue, improves its water resistance, which is its drawback, and also improves the workability during mixing and painting. As a result of extensive research into adhesives for fiber wall materials that have excellent properties and storage stability, we have found that by adjusting the particle size of aluminum sulfate, which has been considered unsuitable for use in the past, we have developed a glue that can be used quickly when water is added to cross wires. The present inventors have discovered that thickening and gelation can be suppressed, leading to the present invention.

(Means for Solving the Problems) Sunawachi, the present invention uses carboxymethylcellulose 95~
99.5 parts by weight contains particles with a particle size of 149 microns or less,
Finely powdered sulfur, which is 90% by weight or more, reduces aluminum by 0.0% by weight.
This is a paste for wall materials made by mixing 5 to 5 parts by weight.

The degree of etherification (DS) and viscosity of CMC used in the present invention are not particularly limited, and the DS of the cloth board is 0.6 or more, and the viscosity of the 1% water bath solution is 100 to 700.
0CPS can be used.

The particle size of the aluminum sulfate used in the present invention is particularly important, and it is essential that it be a fine powder that allows 90% by weight or more to pass through a 100 mesh (149 micron) screen.

Normally, commercially available aluminum for reagents and industrial use often contains 15% or more of particles with a particle size exceeding 100 mesh (149 microns) according to the JIS screen, and is pulverized. It is necessary to sieve to remove coarse particles before use.

When aluminum containing 10% or more of particles with a particle size exceeding 149 microns is used, rapid thickening and gelation occur when water is added and mixed, resulting in the formation of many large particles. This causes protrusions called "clumps" to form after the paint dries, causing a poor finish.

The particle size is 100 parts by weight for 100 parts by weight of CMC as the main sizing agent.
It is advisable to mix 0.5 to 5 parts by weight, preferably 1.5 to 3 parts by weight, of aluminum sulfate adjusted so that 90% or more passes through the screen of the mesh. If the amount of aluminum sulfate is less than 0.5 parts by weight, sufficient water resistance will not be obtained, and if it is more than 5 parts by weight, gelation will occur rapidly during crosstalk, making it impossible to obtain a viscosity suitable for painting. It is.

The sizing agent of the present invention is usually mixed with a base material made of sand or earth and fibrous materials such as bulb, wood flour, and cotton in advance, and then added with water at the painting site to adjust crosstalk. , the glue of the present invention may be mixed with other wall substrates at the painting site. In addition, synthetic resin emulsions such as vinyl acetate, starch,
It is also possible to use it in combination with other adhesives.

(Effects of the Invention) The fiber wall material using the wall material glue of the present invention has excellent water resistance and workability during painting, and also has "
There are no lumps and a beautiful finish is obtained.

In addition, the adhesive for wall materials of the present invention has excellent preservability during storage,
When ordinary aluminum sulfate is used, the shelf life of the compounded sizing agent is about 3 months, but when aluminum sulfate with particle size control according to the present invention is used,
Even after many years have passed, it still exhibits good performance as it did immediately after blending.

When a synthetic resin emulsion is used in combination with the wall glue of the present invention, its water resistance is further improved, but at the same time, when a synthetic emulsion is used in combination, painting workability such as trowel slipping and trowel splintering occurs, which is poor. The disadvantages of drying and slow drying speed are also improved.

(Examples) The present invention will be explained in more detail by examples below.
The present invention is not limited to these examples. Parts and % in Examples are parts by weight and % by weight.

The test method was as follows.

(1) 1% solution CMC mixed with 2% aluminum sulfate was mixed well and dissolved to a concentration of 1 part on an anhydrous basis.The results were observed with the naked eye and displayed as follows. .

(2) Water resistance test 60g of wood made of a mixture of 98 parts of CMC and aluminum sulfate W- was applied to the wall material mixed in a predetermined ratio per 3.3-cm coated area.
was added, water was added and kneaded well, and the viscosity of the kneaded product after 30 minutes was adjusted to 7,000 cps to 10,000 cps. Paint it to a thickness of about 1 meter, leave it at room temperature,
Dry.

Seven days after the start of drying, three square test pieces each measuring 0.3 m were prepared and completely immersed in a water tank, and changes in the painted surface were evaluated using the following evaluation.

Wood powder /162 365 parts stone
1 light per month
535! I Wood Powder S
80 ri -
600 Adhesive suitable
Water Appropriate amount (3) Thickening test The kneaded product used for the water resistance test was left indoors, and the viscosity was measured again after 24 hours. The viscosity value at this time was divided by the viscosity value after 30 minutes of kneading to obtain a viscosity index. This value is 1.
The closer it is to 0, the less the viscosity changes (which is good. Even ordinary CMC shows an index value of 1.2 or more due to evaporation of water in the kneaded product because it is left open indoors.

(4) Observation of the formation of lumps During the water resistance test, observe the wall surface 7 days after the start of painting and drying.
It was displayed according to the following evaluation.

Examples 1 to 4, Comparative Examples 1 to 3 Regarding wall materials whose main glue is CMC containing 2% aluminum sulfate with different particle sizes, the solubility of 1% solution of glue, water resistance, and thickening properties of wall materials Table 1 shows the results of comparing the formation status of clumps.

As is clear from Table 1, the particle size of aluminum sulfate is 10
The amount of material that passes through a sieve of 0 mesh (149 μ) is 90
% or more, there is less white cane in the 1% solution, and the increase in viscosity during standing after kneading is small. Furthermore, there is less lump formation on the wall surface after drying, and it has excellent water resistance.

Example 5 CM containing 2% powdered aluminum sulfate with a particle size of 97.5% that passes through a 100 mesh sieve
Tests were conducted on wall materials in which C was used as a glue and ethylene-acetate vinyl-based synthetic resin emulsion was blended in the following proportions. The results are shown in Table 2.

Wall material composition ratio Silica Sand No. 5 1,560 parts Wood powder
/161 185# Clay 7
0ON Brown valve 90〃 Water 3,500# Glue
100# synthetic resin emulsion seal
50. All tests of water resistance, viscosity increase, and lump formation were good, and there was no deterioration in paintability that was seen when synthetic resin emulsion was added, and drying properties were also improved.
There was no problem in touching the surface after 24 hours of drying, which normally takes 48 hours or more. .

Claims (1)

[Claims] 95 to 99.5 parts by weight of carboxymethyl cellulose,
A glue for wall materials prepared by mixing 0.5 to 5 parts by weight of powdered aluminum sulfate in which 90% by weight or more contains particles with a particle size of 149 microns or less.