JPH10130634A - Cleaning material comprising abrasive-containing sponge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cleaning sponge material which contains a novel abrasive and is free from the problem with fine particles falling off by fixing, with a specific resin, fine abrasive particles or composite particles obtd. by granulating the fine abrasive particles with a binder. SOLUTION: This cleaning material is an abrasive-contg. polyvinyl acetal sponge wherein fine abrasive particles or composite particles formed by granulating the fine abrasive particles with a binder have been fixed by a polyvinyl acetal resin constituting the sponge. A pref. binder for the composite particles is a cellulosic resin, an acrylic resin, or a styrenic resin. The fine abrasive particles are pref. selected from among particles of cerium oxide, chromium oxide, iron oxide, zirconia, silicon oxide, silicon carbide, aluminum oxide, and their mixtures.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sponge-like cleaning material for cleaning the surface of glass, electronic parts and the like, and more particularly to a sponge containing an abrasive in which fine particles having an abrasive action are fixed in the sponge-like cleaning material. A cleaning material comprising:

[0002]

2. Description of the Related Art Conventionally, cleaning materials such as cloth, cotton or sponge are well known as materials for cleaning glass, electronic parts and the like. These are used after they are molded into an appropriate size and the contaminated portions are manually or manually washed in a dry or wet manner, or attached to a washing device to continuously wash the entire surface of the object to be washed. There are a wide variety of objects to be contaminated, and for example, adhesion of dust and microorganisms in the air, scale, and adhesion of remnants of pre-processing. When the degree of contamination is low, cleaning can be performed only with a cleaning material or sponge.However, when the degree of contamination is high, a slurry is created by using an appropriate chemical together or dispersing fine particles having a polishing effect in a liquid. However, such a slurry must be used in combination. However, when the fine particles are used in combination, a large amount of the fine particle slurry itself remains on the surface to be cleaned as a new contaminant after the cleaning operation. For this reason, the remaining fine particle slurry has to be washed again, which has a serious drawback that the operation becomes extremely complicated. In particular, when a cleaning device is used, the remaining fine particle slurry is accumulated as contaminants in the device, so that it was impossible to use fine particles together. As a result, many materials to be cleaned are generated as defective products due to insufficient cleaning after cleaning, which is a factor of reducing production capacity.

As a means for solving the above-mentioned problems, a grindstone, buff or sponge-like porous body having fine particles fixed thereto can be considered (see Japanese Patent Application Laid-Open No. 04-065480). However, whetstones and buffs with fixed fine particles have a high polishing power and therefore have a high ability to remove contamination.However, since the hardness is significantly higher than that of commonly used cleaning sponges, they are deformed following the surface to be cleaned and the entire surface is made uniform. It is not suitable as a cleaning material because it is not preferable because it cannot be cleaned, and furthermore, it may cause minute scratches on the surface to be cleaned and sometimes break the object to be cleaned.

On the other hand, fine particles having a polishing effect described in Japanese Patent Application Laid-Open No. 04-065480 are formed into composite particles with cellulose particles, and the composite particles are adhered to the surface of a resin constituting a polyvinyl acetal porous material. Is suitable in terms of the cleaning effect, the ability to follow the surface to be cleaned, and the point that it does not damage the surface.However, the manufacturing method is that the porous body is simply impregnated with the composite particles. The composite particles simply adhere to the surface of the resin constituting the porous body without using an adhesive or with a very small amount of an adhesive. Therefore, the adhesive force of the composite particles to the porous body is extremely weak, and the fine particles fall off the surface and inside of the porous body very easily during use. Therefore, in addition to leaving a large amount of fine particles on the surface to be cleaned after the completion of the cleaning operation, there is a problem that the cleaning performance is reduced due to the falling of the fine particles. Therefore, this is also unsuitable as a cleaning material, and a satisfactory product has not yet been obtained.

[0005]

As a result of intensive studies, the present inventors fixed fine particles having a polishing effect on a resin comprising a polyvinyl acetal sponge, which is a cleaning material comprising a polyvinyl acetal sponge. The object of the present invention is to have the same cleaning ability as when using the fine particle slurry in combination with the cleaning material, and to achieve the same object as when using the cleaning material without using the fine particle slurry. Provided is a cleaning material comprising a novel abrasive-containing sponge that can be used with ease.

[0006]

The gist of the present invention is to provide a cleaning material comprising a polyvinyl acetal sponge, wherein fine particles having an abrasive effect are fixed in the cleaning material by a resin constituting the polyvinyl acetal sponge. A cleaning material comprising an abrasive-containing sponge, and a cleaning material comprising a polyvinyl acetal-based sponge, wherein composite particles obtained by forming fine particles having an abrasive effect in the cleaning material into particles with a binder. Is fixed by a resin constituting a polyvinyl acetal sponge. That is, the cleaning material comprising a sponge containing an abrasive in the present invention comprises a polyvinyl acetal sponge,
The resin constituting the polyvinyl acetal sponge is fixed with fine particles or composite particles having a polishing effect on the resin, and the cleaning material of the present invention is one having a hardness like a grindstone or buff fixing the fine particles or composite particles. On the contrary, since it has both the cleaning ability of the polyvinyl acetal-based sponge which has been conventionally preferably used for cleaning and the polishing ability of the fixed fine particles, it exhibits a high cleaning ability as compared with the case where a sponge not using the fine particles is used.

Furthermore, in the present invention, the fine particles are not adhered to the surface of the resin constituting the sponge, but are fixed inside the resin, so that the adhesive force is strong, and excessive fine particles from the inside during cleaning. It does not fall off. Therefore, it can be preferably used even when used in a cleaning apparatus without contamination of the object to be cleaned due to residual fine particles. Further, a method of producing composite particles obtained by forming a plurality of fine particles and a binder into particles, and fixing the composite particles, can prevent the problem of excessive aggregation of the fine particles during production, and furthermore, Since the adhesive force of the fine particles to the resin constituting the sponge can be increased, the residual fine particles after washing can be further reduced, which is preferable.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, fine particles to be used for cleaning have adequate detergency, while having sufficient hardness and brittleness that do not cause new scratches on the object to be cleaned during cleaning.
Fine particles such as cerium oxide, chromium oxide, iron oxide, zirconia, silicon oxide, silicon carbide, and aluminum oxide are used. The particle size of the fine particles is not particularly limited, but a small particle size is used in order not to damage the object to be cleaned,
Preferably, the particle size is 5 μm or less. The amount of the fine particles fixed to the porous body is 0.2 to 0.2 per apparent volume of the material.
It is preferably 20%, more preferably 1 to 10%.
Exceeding this range makes it difficult to give the sponge material elasticity suitable for cleaning, and in addition, generates too many fine particles during use and may contaminate the object to be cleaned. On the other hand, if the ratio is below this range, the cleaning ability cannot be obtained.

In the present invention, the polyvinyl acetal sponge is made of a polyvinyl acetal resin.
In some cases, in addition to the polyvinyl acetal resin,
A sponge can also be formed by using other binder resin in combination. Other resins include, for example, phenolic resins, melamine resins, urethane resins, and the like.
This sponge has a large number of continuous or independent pores inside. Its physical properties are not particularly limited,
It usually has a pore diameter of 5 to 500 μm and a porosity of 80 to 95%. When the above-mentioned resins are used in combination, effects such as improvement in durability and chemical resistance over long-term use can be added as compared with the case where the polyvinyl acetal resin is used alone. However, since the above resins generally have high hardness, there is a possibility that the sponge may not have a low hardness desired for cleaning use. Therefore, a sponge is usually formed by using a polyvinyl acetal resin alone or in combination with a very small amount of another resin.

In the present invention, it is necessary to fix the fine particles to a resin constituting a sponge. The fine particles are not attached to the resin constituting the sponge without using an adhesive, as is found in the prior art, or simply attached via a very small amount of adhesive. In the present invention, the fine particles can be fixed inside the resin constituting the sponge because the fine particles are dispersed in the reaction solution of the resin constituting the sponge and the resin is cured by reaction in that state.
For this reason, the fine particles are firmly fixed using the resin of the sponge itself as an adhesive, and no extra fine particles are generated by dropping from the inside of the sponge that is not in contact with the object to be cleaned during use. Only the fine particles on the surface in contact with the surface act for cleaning. This makes it possible to avoid contamination by fine particles after cleaning while maintaining the high cleaning effect of the fine particles.

The fine particles may be directly fixed to a sponge, but fine particles suitable for cleaning use have a very small particle size of 5 μm or less, so that they are easily aggregated at the time of production, making it difficult to produce a homogeneous material. Further, even when the sponge is immobilized, the bonding force to the resin constituting the sponge is not large. For this reason, the fine particles are formed into composite particles having a particle size that can be easily fixed using a binder, and the composite particles are fixed to a sponge, whereby the fine particles can be easily fixed. The phenomenon of contaminating the surface can be further avoided. The binder used in this method is not particularly limited, but a binder having a weak binding force is preferable so that the composite particles can be easily crushed at the time of washing to generate fine particles and act on the washing. For example, a cellulose resin is used. It is preferable to use an acrylic resin, a styrene resin, or the like.

In the present invention, the particle size of the composite particles is not particularly limited, but is preferably 5 to 200 μm.
And more preferably 20 to 100 μm. If it exceeds this range, the composite particles are likely to hit the object to be cleaned, possibly damaging the object to be cleaned. If it is below this range, it tends to agglomerate during production, making it difficult to obtain a homogeneous porous body. In order to obtain the abrasive-containing sponge of the present invention, a polyvinyl acetal-based sponge may be produced by a known method, and fine particles or composite particles may be charged at the time of mixing the raw material solution. The production method will be described. A polyvinyl alcohol solution in which polyvinyl alcohol powder as a raw material of a polyvinyl acetal resin is dissolved is prepared, and fine particles or composite particles are mixed and sufficiently stirred to form a dispersion solution. A well-known pore-forming material, such as starch, is added to the dispersion, and formalin, which is a raw material for the acetalization reaction of polyvinyl alcohol, and an acid catalyst, which is a reaction catalyst, are added, followed by reaction hardening. The order in which the above-mentioned raw materials are charged can be arbitrarily changed. After the acetalization reaction,
A polyvinyl acetal-based sponge in which fine particles are fixed by removing the remaining catalyst and raw material components is obtained.

In the above-mentioned production method, a resin other than the polyvinyl acetal resin or a raw material thereof can be added as required. Properties such as abrasion resistance and chemical resistance according to the properties of the added resin can be added to the sponge. Further, in the above-mentioned production method, the reaction can be carried out after foaming by a method such as vigorously stirring the raw material mixture without using a pore-forming material to obtain a sponge. In this case, a sponge with less impurities can be easily obtained because there is no residue of the pore-forming material that must be removed after the reaction.

[0014]

The cleaning material comprising a sponge containing an abrasive of the present invention is characterized in that fine particles having a polishing effect and high detergency are fixed to a resin constituting a polyvinyl acetal sponge. When a sponge containing an abrasive is used, a cleaning effect that cannot be obtained with a conventional cleaning sponge can be obtained, and a large amount of fine particles do not remain as new contaminants on the surface to be cleaned after cleaning. In the present invention, the fine particles are fixed to the resin constituting the sponge using the resin itself as an adhesive. For this reason, the bonding force is strong, and the fine particles do not fall off from the inside of the sponge during use. Since the fine particles are generated by the contact between the object to be cleaned and the sponge, only the fine particles existing on the contact surface with the object to be cleaned are generated and act on the cleaning. For this reason, the sponge containing an abrasive of the present invention has a high cleaning ability due to the high polishing effect of the fine particles, but does not cause excessive fine particles to drop off and contaminate the object to be cleaned. Therefore, the cleaning material comprising the abrasive-containing sponge of the present invention can very easily remove contamination that cannot be removed by a conventional cleaning sponge. In particular, since there is very little residual fine particles, which is a significant problem when using a cleaning device, it can also be used in a cleaning device.

[0015]

[Examples and Comparative Examples]

Example 1 Cerium oxide was added to a 10% polyvinyl alcohol solution and sufficiently stirred to obtain a cerium oxide dispersion. Subsequently, formalin and sulfuric acid as an acetalization reaction catalyst,
The pore former starch was added. The mixture was left in a 60 ° C. warm bath for one day to allow the acetalization reaction to proceed. Thereafter, the obtained reaction product was washed with running water to remove excess raw materials, thereby obtaining an abrasive-containing sponge. The obtained abrasive-containing sponge was rubbed by hand with a liquid crystal base glass to which the abrasive was attached and contaminated, and the contamination was completely removed. The effect was obtained after 300 or more cleanings. Also lasted. Although some residual cerium oxide particles were present at the washing location, the amount was extremely small as compared with the case where the fine particle slurry was used in combination, and the residuals could be washed very easily. In addition, no trouble such as generation of scratches was observed at the washing location.

Example 2 In the production method of Example 1, a sponge containing abrasives using composite particles having a diameter of 50 μm and comprising 80 parts by weight of cerium oxide and 20 parts by weight of methacrylic acid resin as binders instead of cerium oxide was used. Obtained. When the obtained sponge containing an abrasive was used for cleaning a liquid crystal glass substrate in the same manner as in Example 1, the contamination could be completely removed, and the effect was 3%.
It continued even after washing for more than 00 times. Further, the remaining amount of cerium and composite particles at the washing location was so small that it could not be detected visually. No scratches were found at the washing locations.

COMPARATIVE EXAMPLE 1 A dispersion of cerium oxide dispersed in a polyvinyl acetal solution was impregnated into a polyvinyl acetal-based porous material, and a polishing material attached to the surface of a resin constituting the porous material was used. The liquid crystal glass substrate was cleaned. At the beginning of use, the contamination could be completely removed, but a large amount of cerium oxide remained at the cleaning site. In addition, as the number of uses increases, the ability to remove contaminants decreases, and it becomes impossible to remove contaminants after about 100 uses.

Comparative Example 2 A liquid crystal glass substrate was cleaned in the same manner as in Example 1 using a buff material to which cerium oxide composite particles were fixed, which was used for polishing glass. We were able to remove the pollution,
Fine scratches may be generated on the glass surface, and when the buff material was strongly pressed against the glass to remove strong contamination, the glass was sometimes broken.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08J 5/14 CEX C08J 5/14 CEX 9/35 9/35

Claims (8)

[Claims] 1. A cleaning material comprising a polyvinyl acetal sponge, wherein fine particles having an abrasive effect are fixed in the cleaning material by a resin constituting the polyvinyl acetal sponge. Cleaning material consisting of. 2. A cleaning material comprising a polyvinyl acetal sponge, wherein composite particles in which fine particles having a polishing effect are formed into particles with a binder in the cleaning material are fixed by a resin constituting the polyvinyl acetal sponge. A cleaning material comprising an abrasive-containing sponge. 3. The cleaning material according to claim 2, wherein the binder in the composite particles is at least one resin selected from the group consisting of a cellulose resin, an acrylic resin, and a styrene resin. 4. The cleaning material according to claim 2, wherein the composite particles have a particle size of 5 to 200 μm. 5. The method according to claim 1, wherein the fine particles having a polishing effect are any of cerium oxide, chromium oxide, iron oxide, zirconia, silicon oxide, silicon carbide, and aluminum oxide, or a mixture thereof. Cleaning material made of sponge with abrasive. 6. A cleaning material comprising an abrasive-containing sponge according to claim 1, wherein the fine particles having a polishing effect have a particle size of 5 μm or less. 7. The content of fine particles or composite particles having a polishing effect is 0.2 to 20% per apparent volume of sponge.
A cleaning material comprising the abrasive-containing sponge according to claim 1 or 2. 8. The resin constituting the polyvinyl acetal sponge, wherein at least one member selected from the group consisting of a phenol resin, a melamine resin and a urethane resin is added to the polyvinyl acetal resin. A cleaning material comprising the abrasive-containing sponge described above.