JPH069995A - Method for removing stain from water-impermeable material - Google Patents

Abstract

PURPOSE:To economically and efficiently remove stain from water-impermeable material in a simple operation without detriment to the quality of the material. CONSTITUTION:A layer for removing dry stain which contains a water-soluble alkali metal silicate as the effective constituent is deposited on a water- impermeable material such as a tent cloth. A water supply material is fed to the layer to hydrate the alkali metal silicate to thereby form a hydrated layer so that the stain is incorporated by absorption into the hydrated layer. This hydrated layer is then removed from the water-impermeable material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing stains on non-water permeable materials. More specifically, the present invention relates to a method for removing stains on the surface of a non-water permeable material such as a membrane for a structure, a tent, a waterproof hood, a waterproof garment and a sheet for construction work.

[0002]

2. Description of the Related Art Conventionally, as a waterproof sheet for a tent, a membrane material for a building structure, a sheet material for a simple warehouse, a truck hood, waterproof clothing, etc., for example, on one or both sides of a fiber cloth,
A non-water permeable sheet material obtained by coating or laminating a non-water permeable polymer thin film, for example, a polyvinyl chloride resin coating layer, a stretched porous polytetrafluoroethylene coating layer or the like is used. These materials include, for example, the hydrophobic and lipophilic nature of the coating material itself, or
There is a problem that the stains are easy to be removed and are difficult to remove due to deterioration and deterioration of the stain itself or bleeding of additives such as a plasticizer. Further, a sheet for construction work, for example, a sheet in which a synthetic monofilament is coarsely woven, a sheet in which a yarn is coated with a synthetic resin material, and the yarn is coarsely woven,
Also in a sheet or the like in which the yarn is coarsely woven and coated with a synthetic resin, there is the same problem of stain as above.

In order to prevent the non-water-permeable material as described above from being soiled, a method of blending an anti-soiling agent such as a silicone compound and a fluorine-containing compound into the coating polymer, or a polymer thin film is prevented. Staining agent or antifouling polymer material,
For example, a method of coating with a polyacrylic resin or a fluorine-containing polymer resin has been performed. However, those using such an antifouling agent or an antifouling polymer material have poor cold resistance, poor melt stitchability, poor adhesion, complicated processing, and / or high cost, etc. I have a problem. It also cleans dirt on the surface of non-water permeable materials with ordinary detergents,
Alternatively, it has been attempted to wash and remove using an organic solvent, but this method causes practical problems such as deterioration of the material itself, deterioration of waterproofness, and penetration of dirt into the non-water-permeable polymer thin film. In many cases, the effect was unsatisfactory and it was difficult to adopt.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above problems of the conventional stain removing method, does not deteriorate the quality of the material to be cleaned, and causes recontamination of stains or permeation. It is an object of the present invention to provide a stain removing method capable of efficiently removing stains of a non-water permeable material with a relatively simple operation and a relatively low cost.

[0005]

Means for Solving the Problem and Its Action The method of removing stains of a non-water permeable material according to the present invention is a method of removing a stain of a non-water permeable material on a surface area to be removed by adhering to the surface area in a dry state. And forming a stain removing agent layer containing a water-soluble alkali metal silicate material as an active ingredient, and supplying a water-supplier having water as a main component to the stain removing agent layer to obtain the water-soluble alkali metal silicate salt. Absorbing inclusion of soil on the surface area in a hydrated soil removal agent layer formed by hydration of the material, and then removing the hydrated soil removal agent layer containing absorption of the soil from the surface area. , Including that.

The stain remover used in the method of the present invention is mainly
It also contains a water-soluble alkali metal silicate material as an ingredient.
Of. Water soluble alkali metal silicate material is silicic acid
Sodium (sodium metasilicate (Na₂SiO₃)
And its hydrates, sodium orthosilicate (Na_FourS
iO_Four), Sodium disilicate (Na₂Si₂O_Five),
Sodium tetrasilicate (Na ₂Si_FourO₉) Etc.
), Potassium silicate (potassium metasilicate (K₂Si
O₃), Potassium disilicate (KHSi)₂O_Five) Etc.
Included) and water glass (Na₂O ・ nSiO₂, However
n includes 1 or more, preferably 2 to 4), and
Other water-soluble alkali metal silicates, such as lithium silicate
Um, even if it is water-soluble under the conditions of use.
Can be used.

Water-soluble alkali metal silicate materials are commonly used as cleaning builders, but have not been known to exhibit excellent cleaning effects when dried by themselves from aqueous solutions. However, since it was first discovered by the present inventors that when it is dried from its hydrated state, it can absorb and contain dirt on the surface of a non-water permeable material, thereby removing dirt. is there.

The stain remover used in the method of the present invention may contain at least one kind of preservative, antifungal agent, fragrance, color pigment and bleaching agent in a required amount. Further, in the method of the present invention, a surfactant which is used as a penetrating agent or a hydrophilizing agent in order to improve the hydration property of the stain removing agent and the washing (removal) property thereof with water. You may use together. The surfactant may be attached to the surface of the non-water permeable material together with the soil removing agent, or may be supplied to the soil removing agent layer together with the water supply agent.

As the surfactant used for such a purpose, the following can be used. That is, sorbitan fatty acid ester, (poly) glycerin fatty acid ester, polyethylene glycol monostearate, fatty acid diethanolamide, stearic acid monoglyceride, sorbitan monostearate, sorbitan monooleate, polyhydric alcohol fatty acid ester, glycerin monooleate, polyoxy Ethylene glycerin monostearate, polyoxyethylene sorbitan monooleate, sorbitan monolaurate, sorbitan monovermitate, ventaerythritol fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene alkylphenol, polyoxyethylene alkylamine, polyoxy Ethylene alkyl amide, fatty acid polyethylene glycol ester, fatty acid sorbitan ester, poly Xyethylene fatty acid sorbitan ester, fatty acid glycerin ester, alkyl polyethyleneimine, fatty acid amine salt, alkyl phosphate ester salt, polyoxyethylene alkyl phosphate ester salt, alkyl sulfate ester salt, polyoxyethylene alkyl sulfate ester salt, alkyl amine salt, alkyl No. 4 Grade ammonium salt, alkyl imidazoline derivative, alkyl betaine,
Alkyl imidazoline derivatives, N-alkyl β-alanine, various higher fatty acid glycerides (however, as fatty acids, lauric acid, myristic acid, valmitic acid, stearic acid, montanic acid, oleic acid, linoleic acid, pehenic acid, etc. are used. Mono, di or triglycerides are used.) Tributyl phosphate, triisooctyl phosphate, tribenzyl phosphate, triphenyl phosphate, phenyl decyl phosphate,
Diphenyl isodecyl phosphate, triphenyl phosphate, benzenesulfonic acid, paratoluenesulfonic acid, or salts or hydrates thereof can be used.

The soil removal treatment according to the method of the present invention is applied to the soiled surface area of the non-water permeable material. As the non-water permeable material, a non-water permeable polymer resin (for example,
Polyvinyl chloride resin, polyurethane resin, polyolefin resin, polyamide resin, polyester resin, polyacrylic resin, silicone resin, fluorine-containing polymer resin, ethylene / vinyl acetate copolymer resin, polyethylene-ethylene / vinyl acetate copolymer resin, Polyvinyl chloride graft polymer, synthetic resins such as ethylene-propylene diene polymer, and natural rubber and synthetic rubber (for example, chlorosulfonated polyethylene, neoprene rubber, chlorinated polyethylene rubber, polynitrile rubber,
Materials having a coating layer such as SBR, isobutylene rubber, butyl rubber, polybutadiene, EPT, acrylic rubber, polyurethane rubber, fluorine-containing rubber, silicone rubber) and the like, for example tarpaulins, tents, membranes for building structures , Hoods, sheets for construction work, other waterproof sheets, stretched porous polytetrafluoroethylene sheets, waterproof clothing covered with a polyurethane coating layer, waterproof bags, etc. It does not allow permeation and generally has a hydrophobic surface.

Other non-water-permeable materials include tiles, ceramic materials, concrete, metals, plastics,
There are materials made of bamboo, wood, etc., which do not allow water to easily permeate and dry quickly. The method of the present invention can be applied to these materials as well to efficiently remove stains.

In the method of the present invention, a dry coating layer of a soil removing agent containing a water-soluble alkali metal silicate material is formed on the surface area of the non-water permeable material to be soil removed. In order to form such a dry soil removing agent layer, a water-soluble alkali metal silicate material is dissolved in an aqueous medium to prepare an aqueous solution, and the aqueous solution is applied to the surface of the non-water permeable material to be soil-removed. The coating may be applied on the area and the coating layer may be dried. This method allows the stain remover to be evenly deposited on the desired material surface area.

The above-mentioned stain removing agent aqueous solution can be applied by a usual method, that is, a brush application method, a spray method, a dipping method or the like. In the aqueous solution of the antifouling agent of the present invention containing a water-soluble alkali metal silicate material as a main component, the concentration of the water-soluble alkali metal silicate material is not particularly limited, but is generally specified to be 1 g / liter or more. Is preferable, and it is more preferable to adjust the amount within the range of 10 g / liter to 300 g / liter.

The solution coating layer of the stain removing agent is dried to
It is transformed into a dry stain remover coating (adhesion) layer. This drying is an important step in the method of the present invention, and the stain removal cannot be achieved only by applying the stain removing agent aqueous solution. The stain removing agent coating layer is dried in a temperature range of 0 ° C to 150 ° C, and forced drying such as hot air drying or radiation drying may be performed, but generally 0 ° C to 100 ° C, preferably 0 ° C. It is preferable to perform natural drying or low temperature drying at a temperature of -60 ° C. Such natural or low-temperature drying improves the stain removal effect in the subsequent hydration treatment.

The content of the water-soluble alkali metal silicate material contained in the stain removing agent layer in the dry state is 0.05.
It is preferably in the range of ^{g / m 2 ~300g / m 2} , preferably in the range of ^{0.5g / m 2 ~200g / m 2} .

As described above, the water supply agent containing water as a main component is supplied to the stain removing agent layer attached to the surface region of the non-water permeable material. The water supply agent may be composed of only water, or may be an aqueous solution containing the above-mentioned surfactant and / or water-soluble organic solvent. By this operation, the water-soluble alkali metal silicate material in the stain removing agent layer,
It hydrates rapidly and absorbs dirt in it. This hydration treatment is preferably performed at a temperature of 0 ° C to 100 ° C, and more preferably at a temperature of 10 ° C to 60 ° C. In addition, the hydration treatment is 1 to 3
It is preferably performed for 0 minutes.

Next, the hydrated soil removing agent layer which absorbs and contains soil is removed from the surface of the non-water permeable material by washing with water or wiping.

The stain removal method of the present invention achieves a desired stain removal by the above-described action mechanism. Thus, the surface of the material to be decontaminated may be smooth as long as it is capable of forming a decontaminating agent layer on it and washable with water, and has a rough surface with irregularities. , Or may be complexly deformed, and efficiently from these surfaces by the method of the present invention,
Dirt can be removed.

In the method of the present invention as described above, a stain removing agent is used together with a stain removing agent to carry out an adhesion / drying treatment and a formation and removal treatment of a hydrated stain removing layer,
During this time, the surface of the non-water permeable material may be subjected to a stain prevention treatment. As the antifouling agent, a silicone water repellent, a fluorine-containing compound (polymer) water repellent, or the like can be used.

[0020]

EXAMPLES The present invention will be further described below with reference to examples.

Examples 1 to 4 and Comparative Examples 1 and 2 In Examples 1 to 4 and Comparative Examples 1 and 2 , respectively, polyester fiber spun yarn plain weaves having the following structure (I):

[Equation 1] Unit weight: 195 g / m ² was scoured and dried by a conventional method to obtain a waterproof sheet base fabric. Separately, the following composition of the resin composition: Component Parts by weight Polyvinyl chloride resin 100 D. O. P. (Plasticizer) 75 Titanium dioxide (white pigment) 8 Antimony trioxide (flameproofing agent) 5 Zinc stearate (stabilizer) 3 was kneaded with a calendar and molded into a film having a thickness of 0.1 mm. This polyvinyl chloride resin film was placed on both sides of the base fabric and heat-pressed. The obtained waterproof sheet had a thickness of 0.58 mm and had a white and dirty surface.

This white waterproof sheet was stretched and fixed on a frame body having a length of 1 m and a width of 5 m. This dirt exposure test sample was fixed on the roof of a three-story building in the urban area at a height of 1 m from the roof surface and at an angle of 30 degrees from the vertical surface, facing south,
This was subjected to outdoor exposure for 3 months. The exposed sample was fairly noticeably soiled.

A stain removal treatment liquid having the composition shown in Table 1 was applied to the stain surface area of this stain sample at a temperature of 20 ° C.
Air dried at 25 ° C. Water is gently sprayed onto the dry soil remover layer to fully hydrate the water-soluble alkali metal silicate material in the layer and leave it in this state for 10 minutes, then shower it strongly with water. Water was supplied, and the hydrated stain removing agent layer was washed off. After that, the washed surface of the sample was observed to evaluate the stain removal effect. The results are shown in Table 1.

[0024]

[Table 1]

Note * ₁ Soil removal effect: Remarkably good ... The stain was completely removed, and the surface condition before the exposure test was restored. Good ... The stains were almost completely removed, and the surface condition before the exposure test was obtained. Defective ... By rubbing the dirt surface, the dirt was slightly removed.
Traces of friction remained and the surface was worn. Very poor ... Almost no stain removal effect was observed.

[0026]

The stain removal method of the present invention can clean the stain surface of a non-water permeable material, which has been conventionally difficult to remove stains, by a simple operation and extremely efficiently. Further, the stain removal method of the present invention is not limited to various sheet materials, but also a wide range of non-water-permeable materials such as automobiles, houses, washrooms, toilets, baths, sinks, restrooms, kitchens, floors, and exterior wall surfaces of buildings. The functional material can be efficiently washed as described above.

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Claims (7)

[Claims] 1. A stain remover layer, which adheres to the surface region of a non-water permeable material to be soiled in a dry state, and which contains a water-soluble alkali metal silicate material as an active ingredient. Formed on the surface area in the hydrated stain remover layer formed by hydration of the water-soluble alkali metal silicate material by supplying a water-based water supply agent to the stain remover layer. A method of removing stains from a non-water permeable material, which comprises absorbing and including stains, and then removing the hydrated stain remover layer that absorbs and includes stains from the surface area. 2. The stain removing method according to claim 1, wherein the water-soluble alkali metal silicate material is at least one selected from sodium silicate, potassium silicate, and water glass. 3. In the formation of the stain-removing agent layer in the dry state, an aqueous solution of the stain-removing agent is applied onto the surface area of the non-water permeable material to be removed from the stain, and the aqueous solution coating layer is dried. The method for removing dirt according to claim 1. 4. In the dry stain remover layer,
The amount of the water-soluble alkali metal silicate material is 0.05 g
The stain removal method according to claim 1, which is in the range of / m ^{2 to} 300 g / m ² . 5. The stain removing method according to claim 1, wherein the hydrated stain removing agent layer is removed by washing with water. 6. The stain removing method according to claim 1, wherein the hydrated stain removing agent layer is removed by wiping. 7. The stain removing method according to claim 1, wherein the hydration treatment is performed within a temperature range of 0 ° C. to 100 ° C.