JPH0349308B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for stripping fiber walls that is widely used indoors, and more specifically, it enables easy stripping and removal of old fiber walls, significantly shortening the construction period, and providing an advantageous solution to the subsequent application of new fiber walls. This invention relates to a fiber type peeling method. In general, fiber walls are made of fibers such as pulp, inorganic materials such as Kyoto clay and mica, and glue materials such as carboxymethyl cellulose (CMC), acetic acid-vinyl resin, vinegar-vinyl acrylic copolymer, styrene resin, and acrylic copolymer. It is mixed and kneaded with water, and is widely used in the field of residential interior decoration as a finishing material for walls, etc. Fiber wall materials can be classified into the following four types depending on the fibrous material. The main raw material is cotton fiber. Items whose main raw material is wood flour or other granular materials. The main raw material is filamentous fiber. Contains large amounts of inorganic materials in addition to organic fibers. These fiber walls have the following major characteristics: Because glue is mixed into the material, they are easy to work with. Workability is extremely good, increasing construction efficiency several times. It can be installed even if you are not a skilled worker. Because the glue does not rot, mold does not grow. Due to the abundance of materials, a wide variety of colors and patterns can be created. Because the quality is consistent, there is no unevenness in the finish. As a result, it has been widely used as a new plastering material in place of traditional natural clay walls such as Kyoto walls, not only in wooden houses but also in public corporation houses, schools, hospitals, etc. On the other hand, when these fiber walls become dirty or aged, or when redecorating due to other needs, it is generally difficult to remove this wall material, so most of them are coated with a top coat. is the current situation. If this is done, in severe cases the walls will rise above the pillars. Therefore, there is a wide demand for a chemical agent for peeling off old fiber walls, but no suitable peeling agent has been found so far. The present invention aims to provide a method for stripping fiber walls using a fiber wall stripping agent having good properties, and the present inventors have arrived at the present invention through repeated research as follows. This is what I did. In order to peel off and remove the fiber walls, it is necessary to decompose the synthetic glue material, dissolve or disperse it in a solvent, return each component of the wall material to its state before it was applied to the wall, and remove it by some method. Therefore, the present inventors have considered dissolving and swelling the adhesive in cellosolve or carbitol, and then dispersing it in water together with other inorganic components for peeling. However, when removing old fibrous walls, the walls are coated with at least one coat, which requires large amounts of solvent and water to be applied to the vertical walls in order to be removed by the system. This is extremely difficult to do with a mixture of solvent and water, as most of it drips or evaporates.
It cannot seep into the wall and swell the synthetic glue inside. The present inventors have conducted further research with the aim of solving this dripping problem and providing a method for peeling fiber walls that improves the peeling effect. As a result, the following new composition has been developed to meet the above objectives. We have discovered that it is possible to achieve this. Cellosolves, or cellosolves and carbitols Cross-linked acrylic acid polymer Non-ionic surfactant Inorganic or organic alkali This combination is a suspension, and if necessary, water is added to the composition to form a cellosolve. or cellosolves and carbitols 30-85% by weight Cross-linked acrylic acid polymer 0.6-3% by weight Nonionic surfactant 3.0-6% by weight Propylene glycol 0-6% by weight Inorganic or organic alkali
It is stored and transported as a composition with a viscosity of 100 to 400 CPS, consisting of 0.15 to 0.7% by weight of water and 0 to 65% by weight, and when used, it is diluted with the same amount to twice the amount of water as the above composition to bring the viscosity to 15,000 CPS or more, preferably. It has been found that the most preferable method is to increase the CPS to 30,000 CPS or higher and use it as a release agent. This increased viscosity after dilution solves the problem of dripping, which is a feature of the present invention. That is, the present invention comprises: Cellosolves or cellosolves and carbitols 30-85% by weight Cross-linked acrylic acid polymer 0.6-3% by weight Nonionic surfactant 3.0-6% by weight Propylene glycol 0-6% by weight Inorganic or organic alkali
0.15-0.7% by weight water (preferably 0-46% by weight)
A stripping agent for fiber walls consisting of 0 to 65% by weight with a viscosity of 100 to 400 CPS is stored and transported, and when used, diluted with the same amount or twice the amount of water as the stripping agent to increase the viscosity to 15,000 CSP or more. The present invention relates to a method for stripping a fiber wall, which method comprises applying a coating to the fiber wall. Next, regarding each component of the release agent used in the present invention,
We will explain its functions and give examples of each component. Cellosolve and carbitol are solubilizers for binders for fibrous topcoating materials such as CMC (carboxymethyl cellulose), styrene-acrylic copolymers, and vinyl acetate resins. Cellosolve is
A general term for ethylene glycol monoethers represented by HOCH ₂ CH ₂ OR, in which R is an alkyl group, with butyl, ethyl, and methyl being particularly preferred. Carbitols are
In addition to diethylene glycol ethyl ether represented by HOCH ₂ CH ₂ OCH ₂ CH ₂ OCH ₂ CH ₃ , it also includes those in which the ether moiety is methyl, propyl, or isopropyl ether.
This is an optional ingredient and is 50%
It can be added in a proportion of up to 20% by weight, preferably 20 to 30% by weight. Since cellosolve and carbitol are compatible with water and have low volatility, they dissolve and swell the binder used in wall materials, and when using a stripping agent, the swollen cellosolve and carbitol are dispersed in the water system that is present. The effect is great. On the other hand, other solvents, such as water-soluble polar solvents such as ketones and alcohols, are solvents for these binders, but their effectiveness is extremely small when used as a component of the stripping agent due to their volatility. Furthermore, nonpolar petroleum solvents (alkyl compounds such as benzine, benzene, toluene, xylene, etc., and aromatic solvents containing them) or chlorinated solvents have no effect at all. Cross-linked acrylic acid polymers are made by polymerizing acrylic acid or methacrylic acids in the presence of a cross-linking agent, along with other copolymerizable monomers if necessary, to form a multi-branched cross-linked polymer main chain. −
It is an acidic polymer electrolyte containing COOH (see JP-A-49-130485, etc.), and several types of synthetic polymer thickeners are commercially available. Cross-linked acrylic acid polymer is a polymer substance with a multi-branched molecular structure and has many dissociative groups in its side chains, so in its aqueous solution, electrical repulsion acts as the particles swell, causing the molecules to swell. It exhibits a remarkable thickening phenomenon upon stretching. A solution of this substance has a relatively low viscosity, but when an appropriate alkali is added to neutralize it, ionization is promoted, the molecules are greatly elongated, and the viscosity of the solution rises rapidly. Generally, the viscosity increases as the concentration increases, similar to polymeric substances. In the case of the above formulation, the crosslinked acrylic acid polymer is not sufficiently neutralized with the base, and the
A 3-fold dilution increases alkaline counterions,
It is thought that a significant increase in viscosity is observed. The plastic fluid liquid thus obtained flows with a lower apparent viscosity when subjected to stress greater than the yield value, and when left to stand still, the viscosity recovers over time, which is a great advantage in use. Moreover, this thickening is affected by the penetrating agent, and no thickening is seen with anionic or cationic active agents. The only active agents that have excellent permeability and do not inhibit thickening are nonionic ones. As mentioned above, nonionic surfactants are penetrants and dispersants for inorganic substances in separated wall materials. Nonionic surfactants with strong hydrophilicity and good permeability, such as polyoxyethylene, are All of them can be used, but among them, polyoxyethylene alkyl phenol ethers, particularly polyoxyethylene having an added mole number of 6 to 14 and an alkyl group such as octyl or nonyl, and polyoxyethylene sorbitan ethers are preferably used. The best blending amount is about 7% based on the solvent, and even if the blending amount is increased beyond the specified limit, good results will not be obtained, and the thixotropic properties of the stripping agent used in the present invention will tend to deteriorate. Propylene glycol is a solvent for the synthetic glue in the fiber walls. As mentioned above, inorganic or organic alkalis act on the crosslinked acrylic acid polymer to increase the solution viscosity, and include NaOH, KOH,
NH ₄ OH, morpholine, monoethanolamine, etc. are used. Liquids with high viscosity generally have poor permeability, but when applied to a wall surface, the stripping agent according to the present invention dissolves anionic substances or alkaline inorganic salts contained in the wall material, gradually decreasing the viscosity and decreasing the permeability. It is improved and seeps into the wall and destroys the wall material structure. The destroyed wall material composition is dissolved or dispersed in the stripping agent. This mixture of release agent and wall material composition exhibits dilatancy and loses its fluidity so that it does not drip onto vertical wall surfaces. The present invention is a new peeling method for changing old fiber walls into this state, and peeling off old walls in this state can be easily done with a plasterer's trowel. This method can be said to be excellent in terms of ease of construction, shortening of construction period, and no scattering of wall material components. The results of changes in viscosity due to temperature of the stock solution of the composition () according to the present invention and the viscosity of a 2- to 3-fold diluted solution obtained by adding the same amount to twice as much water to this stock solution are shown below. Composition A Butyl cellosolve 47 parts by weight Propylene glycol 3 Noniphenyl surfactant Emulgen 911 (manufactured by Kao Soap Co., Ltd., trade name) 3 Crosslinked acrylic copolymer Hivis Wako H-103 1 (Wako Pure Chemical Industries, Ltd.) Co., Ltd., product name) Caustic soda aqueous solution 25% 0.8 Water 45.2 Total 100.0 parts by weight

【table】

[Table] This product exhibits the following properties and can be said to be desirable as a fiber wall release agent.

【table】

[Table] Comparison of specific examples of compositions used in the examples of the present invention, changes in viscosity when diluted with water when used as a release agent in the present invention, and appearance when used as a release agent. It is shown together with a specific example of the composition used in the example. Composition 1 (for Example 1) Polyoxyethylene nonylphenol ether (trade name Emulgen 911 manufactured by Kao Soap Co., Ltd.) 4.0 parts Butyl cellosolve 45.0 parts Propylene glycol 4.0 parts Cross-linked acrylic acid polymer (Hivis Wako H-103) 1.0 parts 25% NaOH aqueous solution 0.8 parts water 45.2 parts Mix polyoxyethylene nonylphenol ether and butyl cellosolve in a mixing tank. Add the crosslinked acrylic acid polymer little by little to this mixture while continuing to stir. Increase the temperature to 50°C and stir until there are no more insoluble particles. Next, the mixture is cooled to 30-40°C, propylene glycol and water are added, and then a 25% NaOH solution is added all at once and mixed uniformly. Composition 2 (for Example 2) Polyoxyethylene nonylphenol ether
3.0 parts Butyl cellosolve 47.0 parts Cross-linked acrylic acid polymer (Hibis Wako H-103) 1.4 parts 25% NaOH aqueous solution 1.0 parts Water 47.6 parts The following compositions 2 to 5 follow the manufacturing method of composition 1. Composition 3 (for Example 3) Polyoxyethylene octyl phenol ether
3.0 parts Butyl cellosolve 60.0 parts Cross-linked acrylic acid polymer 3.0 parts 25% NaOH aqueous solution 1.8 parts Water 32.2 parts Composition 4 (for Example 4) Polyoxyethylene nonyl phenol ether (trade name Emulgen 911 manufactured by Kao Soap Co., Ltd.) 3.0 parts Part Butyl cellosolve 30.0 parts Crosslinked acrylic acid polymer 1.0 parts 25% NaOH aqueous solution 1.5 parts Propylene glycol 4.0 parts Water 60.5 parts Composition 5 (for Example 5) Polyoxyethylene sorbitan monostearate (trade name Tween 60 Kao Soap Co., Ltd.) ) 3.0 parts Butyl cellosolve 40.0 parts Ethyl carbitol 5.0 parts Cross-linked acrylic acid polymer 1.0 parts Propylene grayul 3.0 parts 25% ammonia water 0.5 parts Water 37.5 parts Composition 6 (for Comparative Example 1) Sodium octylsulfosaccharide Nate (Kao Perex OTP) 3.0 parts Butyl Cellosolve 40.0 parts Propylene Glycol 15.0 parts Water 42.0 parts Compositions 6 and 7 follow the manufacturing method of Composition 1. Composition 7 (for Comparative Example 2) Sodium octisulfosuccinate 3.0 parts Ethyl cellosolve 46.0 parts Propylene glycol 4.0 parts Cross-linked acrylic acid polymer 1.0 parts 25% NaOH aqueous solution 0.8 parts Water 55.2 parts

【table】

[Table] Examples 1 to 5 and Comparative Examples 1 and 2 (1) Water-resistant fiber wall material (GFWA) Lightweight ceramic granules 500 parts Organic-inorganic granules (colored) 600 parts Colored inorganic foam granules 350 parts Lightweight Pottery granulated colored material 350 parts CMC 60 parts Mix at the above mixing ratio, add 2.2 parts of tap water,
Add 700 parts of acetic acid biacrylic copolymer emulsion, mix, and apply with a trowel to the gypsum plaster base.
The samples were dried and cured for one month in a constant temperature and humidity room at 65% °C. This was diluted by adding 2 parts of tap water to 1 part of each of compositions 1 to 5, and after stirring thoroughly, 1 m/1 m
When it was applied to a thick layer, left for 30 minutes, and removed with a scraper, it was easily removed (Examples 1 to 5). In addition, similar operations were performed using Compositions 6 and 7 (Comparative Examples 1 and 2), and in addition to the case where Compositions 1 to 5 for Examples 1 to 5 were used,
The state of peeling is shown in Table 4.

【table】

[Table] Example 6 The same wall materials as in Examples 1 to 5 were constructed on a gypsum plaster base, and on the wall surface after 10 years, 1 part each of Compositions 1 to 5 for Examples 1 to 5 and 2 parts of tap water were added. After stirring, 450 g/m ² was applied with a trowel, left to stand for 15 minutes, and removed with a scraper, and it was easily removed. The coating thickness was about 3 to 4 m/m, and the base could be removed without damage. In addition, when similar peeling tests were conducted on the following fiber walls, similar to Examples 1 to 5 and 6 above,
The fibrous top wall member could be easily removed without damaging the underlying material. (2) Sand wall (GFWA) Colored silica sand 4900 parts Inorganic lightweight powder 20 parts CMC 50 parts Acrylic styrene copolymer emulsion 300 parts (Tap water at the time of construction 2000 parts) (3) High-grade Jiyuraku Wall (GFA) (Patent No. 1106701) No.) Apprus colored material 1500 parts Hakuryu crushed stone 700 parts CMC 80 parts Natural colored soil 350 parts Clay 150 parts Additives 40 parts Powder pulp 70 parts Vinyl acetate emulsion 100 parts (Tap water at the time of construction 3000 parts) (4) Filamentous fibrous top coating Materials (GF) Special spun synthetic yarn 80 parts Tricot fiber 160 parts Inorganic foam granules 50 parts Wood flour 100 parts Aluminum 30 parts Synthetic fiber vapor-deposited product 10 parts CMC 90 parts Synthetic fiber twisted yarn 80 parts (Tap water at the time of construction 6500 parts)

Claims (1)

[Claims] 1 Cellosolves, or cellosolves and carbitols 30 to 85% by weight Crosslinked acrylic acid polymer 0.6 to 3% by weight Nonionic surfactant 3.0 to 6% by weight Propylene glycol 0 to 6% by weight % Inorganic or organic alkali 0.15-0.7% by weight Water 0-65% by weight A fiber wall release agent with a viscosity of 100-400 CPS is stored and transported, and when used, it is diluted with the same amount or twice the amount of water as the release agent. Increased viscosity to over 15000 CPS,
A method for removing fiber walls, which consists of applying this material to the fiber walls.