JPS641428B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a fiber wall coating composition used mainly for interior finishing and construction of walls and ceilings of buildings. More specifically, it is a decorative topcoat material for plastering, which includes organic or inorganic fiber materials, colored clay, mixed materials such as perlite, cationically modified starch, and carboxymethyl cellulose (hereinafter abbreviated as CMC).
The present invention relates to a composition for fiber wall coating materials whose main raw material is a glue material such as. Conventionally, natural products such as starch, konnyaku flour, and funori have been used as glue for fiber wall coatings, but the glue itself is extremely perishable, causing mold and stains on the walls, and the glue being steamed. Otherwise, it would not be sticky and would have many disadvantages. In order to eliminate these drawbacks, synthetic glues such as CMC have recently begun to be used, but they have poor workability such as troweling, are not sufficiently fluffy after coating, and have poor adhesive strength until drying. There are many inconveniences such as peeling from the coated surface due to insufficient amount. The inventors of the present invention have conducted intensive research on glue materials that have good trowel handling, do not cause noticeable fluff, and have strong adhesive strength.
The present invention was completed by using both CMC and CMC as adhesive materials. That is, cationically modified starch is added in an amount of 0.5 to 20% by weight, preferably 2.0 to 10% by weight, and CMC is added in an amount of 1.0 to 20% by weight, preferably 4.0 to 10% by weight based on the total solid weight of the fibrous top coating material. As a result, a composition for a fiber wall coating material that has good workability such as troweling and does not leave noticeable fluff after coating can be obtained. In addition, although it is not clear what the cationic modified starch, which is a cationic polymer electrolyte, and CMC, which is an anionic polymer electrolyte, are in the coating material composition obtained by the present invention, there is a very large force between them. It has been found to have excellent cohesive strength and high adhesive strength, and even in the hot and humid conditions of the rainy season, when drying is slow, it does not peel off from the coated surface and remains undried for a long time and remains stable and adheres. Furthermore, although cationically modified starch is a starch, unlike starch, it does not rot or mold grows on its surface. The cationically modified starch to be used in the present invention is potato,
Untreated starch or starch-containing materials such as corn, wheat, sweet potato, rice, tapioca, sago, etc., or modified products obtained by oxidation, acid treatment, dextrinization, enzyme treatment, crosslinking, etherification, esterification, etc. The degree of substitution is 0.005 to 0.2 by applying a cationizing agent to any of the starches through a known reaction.
(0.005 substituents per mole of anhydroglucose residue
0.2 mol) is suitable. In addition, the cationically modified starch used for this purpose is watered at room temperature (5℃).
Since it is preferable to dissolve at a temperature of 35° C. to 35° C., it is preferable to further gelatinize and dry with a drum dryer or the like after cationic modification or at the same time as cationic modification. Cationization is 2-chloro-3-hydroxytrimethyl chloride, β-diethylaminoethyl chloride, halogenated alkyl quaternary alkyl ammonium salt, halogenated alkyl tertiary (secondary or primary) alkylamine, halogenated alkyldiamine, epoxy epoxidized alkyl quaternary alkylammonium salt, epoxidized alkyl tertiary (secondary or primary)
The action of epichlorohydrin on starch as well as cationic starch directly obtained with general cationic modifiers such as alkylamines, aminoethyl sulfates, ethyleneimines, sulfoniums, phosphoniums, cyanamides, alkali metal cyanamides, alkaline earth metal cyanamides, etc. cationic modification by ether bonding acrylamide to starch and then Hofmann degradation or Mannitz reaction; hydrogenation after ether bonding (meth)acrylonitrile to starch Any substance that contains a substituent that exhibits cationic properties in the final starch, such as cationic modification, may be used, as well as (meth)acrylic acid aminoalkyl esters or their quaternary ammonium salts, vinylpyridine, and Graft copolymerized modified starch and acrylamide with cationic monomers such as its derivatives, (meth)
It is also possible to perform cationic modification after graft copolymerizing a cationically modifiable monomer such as acrylonitrile, (meth)acrylic acid alkyl ester, (meth)acrylic acid glycidyl ester, or acrolein. The degree of substitution of CMC used in the present invention is 0.5 to 2.0, preferably 0.6 to 1.5. As the sizing agent in the composition used in the present invention, cationically modified starch and CMC are essential, and in addition, polyvinyl alcohol, methylcellulose, natural starch, various modified starches, vegetable gums, polyacrylic acid and its alkali salts, polyacrylamide, etc. are optionally used. The present invention also includes the addition of such substances. The composition of the present invention is used by mixing in advance or at the time of use, and includes cationically modified starch,
In addition to adhesives such as CMC, other adhesives such as tricot, cotton powder, mica (mica), white aluminum scraps, shinchi scum, wood powders such as boxwood, cypress, and cedar, aggregates, gold leaf, copper leaf, synthetic fibers, etc. Used with materials. Next, the present invention will be explained in more detail by referring to Reference Examples, Examples, and Comparative Examples. Reference Example 1 After dissolving 2.5 parts of caustic soda (weight, same hereinafter) and 50 parts of sodium sulfate in 150 parts of water, 100 parts of untreated potato starch was uniformly suspended, and 7.5 parts of diethylaminoethyl chloride was added while stirring. 40℃,
The reaction is carried out for 6 hours. After the reaction is complete, neutralize, wash with water, and gelatinize and dry with a drum dryer (surface temperature 135°C) to make it soluble in water at room temperature. Reference Example 2 Potato starch was dried in a drum dryer (surface temperature 135°C) without the cationic modification of Reference Example 1.
It was dried by heat. Comparative Example 1 After thoroughly loosening and mixing 90 parts of tricot fiber and 10 parts of CMC, 570 parts of water was added and kneaded until evenly mixed. After 30 minutes, the mixture was coated on a base plate and various tests were conducted. Comparative Example 2 Various tests were conducted using 10 parts of pregelatinized potato starch of Reference Example 2 instead of 10 parts of CMC of Comparative Example 1. Comparative Example 3 Same as Comparative Example 1, but use Reference Example 1 instead of 10 parts of CMC.
Various tests were carried out by adding 10 parts of cationically modified starch. Example 1 After thoroughly loosening and mixing 90 parts of tricot fiber, 7 parts of CMC, and 3 parts of the cationically modified starch from Reference Example 1, 570 parts of water was added and kneaded until evenly mixed. After 30 minutes, the mixture was coated on the base plate. and conducted various tests. Example 2 In the same manner as in Example 1, various tests were conducted by adding 3 parts of CMC and 7 parts of the cationically modified starch of Reference Example 1. Example 3 After reacting with the cationically modified starch of Reference Example 1 without α-drying, neutralizing, washing with water, and drying, 5 parts of CMC and 5 parts of CMC were dispersed in 570 parts of water and heated at 85°C or higher for 30 minutes. After gelatinization and cooling to 25°C, the mixture was added to 90 parts of well loosened tricot fibers, kneaded evenly, and after 30 minutes was coated on a base plate and various tests were conducted. Example 4 Various coating tests were conducted for Comparative Examples 1 to 3 and Examples 1 to 3, and the results are shown in the table.

【table】

[Table] ○ Excellent × Not good

Claims (1)

[Claims] 1. A composition for a fiber wall coating material, characterized in that 0.5 to 20% by weight of cation-modified starch and 1.0 to 20% by weight of carboxymethyl cellulose are added to the total solid weight of the fiber wall coating material.