JP3260943B2 - Cleaning sheet and cleaning method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an oil remaining on a surface of a printed circuit board, a diode, a transistor, a magnetic head, an electronic component such as a ceramic applied element, a steel plate, a plastic material, and the like at the time of processing such as molding and forming. The present invention relates to a cleaning method capable of efficiently removing adhered matter such as foreign matter by a dry process using a tape system, and a cleaning sheet used therefor.

[0002]

2. Description of the Related Art Oil, foreign matter, and the like that remain during processing of electronic parts, or during processing of steel sheets and plastic materials, such as molding and forming, cause contamination of important parts in subsequent processing steps. Or reduce the durability of the painted surface. Therefore, the contaminants on the surface are sufficiently cleaned as required. Especially in home appliances, etc., since it greatly affects the reliability of soldering,
Conventionally, CFC cleaning and ultrasonic cleaning have been performed.

[0003]

However, according to cleaning and degreasing with chlorofluorocarbons and organic solvents, 1) the processing time is long,
Low processing capacity per unit, 2) impurities are likely to remain, 3) environmental pollution by chlorofluorocarbons and organic solvents, 4) not applicable to materials that cannot withstand cleaning, 5) space for equipment due to wet process There were problems such as being large.

[0004]

The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, by using a dry process using a specific cleaning sheet, it is possible to solve the conventional disadvantages and to improve the surface coating. The inventor has found that the kimono can be removed efficiently and satisfactorily, and has completed the present invention.

That is, the present invention relates to an electronic component, a steel plate, and a plastic.
Oil remaining during molding and forming
A cleaning sheet for removing Le and foreign matter, the cleaning sheet curable curable adhesive integrated oil and foreign matter and the adhesive component, characterized by comprising provided on a support, And a cleaning method using the same.

[0006]

The curable pressure-sensitive adhesive in the cleaning sheet of the present invention is not particularly limited as long as it is cured by means of light such as ultraviolet rays, heat or the like, and is integrated with the deposit on the surface. In particular, a photocurable pressure-sensitive adhesive is preferred in terms of curing speed and cured film strength.

[0007] As such a photocurable pressure-sensitive adhesive, acrylic polymer, natural rubber, SBS, SIS, SEBS, A
Base polymers such as synthetic rubbers such as BS, polyisobutylene, chloroprene, and neoprene; curing components such as photopolymerizable monomers, photocurable oligomers, oligomers having a polymerization function, and modified polymers; and, if necessary, photopolymerization initiators A compound containing a thermal decomposition type radical generating initiator (peroxide, azobis compound) or the like is used. Redox systems can also be used.

[0008] As the acrylic polymer, a copolymer of butyl acrylate, octyl acrylate, nonyl acrylate, 2-ethylhexyl acrylate, and the like, and if necessary, other monomers can be used. In particular,
Initially, it is better to adhere to the adherend, and butyl acrylate and 2-ethylhexyl acrylate are preferred as the adhesive.

Examples of the photopolymerizable monomer include polyvalent acrylate monomers such as hexamethylene diacrylate, pentaerythryl acrylic ester, glycerol acrylic ester, polyethylene glycol acrylic ester, and polypropylene glycol acrylic ester, and ordinary acrylic monomers. In particular, it is preferable to use an acrylic ester of diacrylic ester or more from the viewpoint of curability.

Examples of the photocurable oligomer include an oligomer having an acrylic group introduced into rubber, an epoxy resin-modified acrylic oligomer, and a styrene resin acrylic-modified oligomer. Particularly, an epoxy resin acrylic-modified oligomer is preferable.

Examples of the photopolymerization initiator include phenyl ketone, benzyl ketal, thioxanthone, aromatic amine, benzophenone, and ferrocene.

The thickness of the pressure-sensitive adhesive layer is not particularly limited, but is usually 10 to 100 μm, preferably 20 to 50 μm.

The support provided with the pressure-sensitive adhesive is not particularly limited as long as it has sufficient transparency for photocuring. Examples thereof include polyester, polypropylene, polyethylene, ethylene-vinyl acetate copolymer, Examples include plastic films such as polyvinyl chloride and polyamide, cloths such as nonwoven fabrics and woven fabrics, and composite products thereof. The thickness of the support is not particularly limited, but is usually 10 to 500 μm, preferably 30 to 200 μm.
m.

According to the present invention, there is also provided a cleaning method for removing adhering substances on the surface of an article by using the cleaning sheet having the above-mentioned structure. Such a cleaning method includes at least 1) a means for attaching the cleaning sheet to a portion of the article where the adhered substance is present, 2) a means for integrally curing the adhered substance and the adhesive component, and 3) a cured cleaning. Means for removing the sheet and the surface deposits from the article integrally by peeling the sheet from the article.

Examples of the above-mentioned sticking means include sticking with a roll and the like, and the adhesiveness can be further improved by heat shrinkage.

The curing means includes a method of irradiating light such as ultraviolet rays, an electron beam, and radiation, and other methods such as thermal curing. Curing treatment by light irradiation is particularly preferable because the curing speed is high and the safety is high. It is preferable that the irradiation amount is usually in the range of 500 to 2000 mj / cm ² for ultraviolet rays.

[0017] By this curing treatment, the adhesive is cured in a state of being integrated with the adhered substance, and after the curing, the sheets are peeled off, whereby the adhered substance on the article surface becomes integral with the sheet. And can be easily and completely peeled off.

[0018]

According to the dry process using the cleaning sheet of the present invention, the processing time is greatly shortened, and the adhered matter and the adhesive component are integrally cured, so that the remaining contaminants on the surface are reduced, and furthermore, the chlorofluorocarbon is reduced. Since no organic solvent or organic solvent is used, there is no adverse effect on the environment and there is an effect that it can be applied to materials that cannot withstand the organic solvent.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. The following parts mean parts by weight. Example 1 For 100 parts of an acrylic polymer composed of 95 parts of butyl acrylate and 5 parts of acrylic acid, 25 parts of hexamethylene diacrylate and 25 parts of pentaerythritol triacrylate as photopolymerizable monomers, and phenyl as a photopolymerization initiator. An acrylic pressure-sensitive adhesive obtained by blending 3 parts of a ketone-based photopolymerization initiator is provided on a polyester film having a thickness of 25 μm so that the thickness after drying is 40 μm, and the cleaning sheet of the present invention is provided. I got

The obtained cleaning sheet is applied to a portion of the printed board where oil is present, heated at 50 ° C., and irradiated with ultraviolet rays at a dose of 1000 mJ / cm ² .
After the oil component and the monomer component were solidified, the sheet was peeled off, and the oil component was peeled and removed integrally with the sheet. In addition, when the oil remaining on the surface was measured by infrared analysis, the removal rate was 98%.

Example 2 100 parts of natural rubber, 40 parts of alkylphenol, 20 parts of cellulose fiber, 1 part of sulfur-based crosslinking agent, 20 parts of a photocurable oligomer obtained by introducing an acryl group into natural rubber, thioxanthone as a photopolymerization initiator A rubber-based pressure-sensitive adhesive obtained by blending 2 parts of a base compound is mixed with a nonwoven fabric having a thickness of 60 μm and 25
The cleaning sheet of the present invention was obtained by providing the film on a laminated film of a polyester film having a thickness of 35 μm so that the thickness after drying was 35 μm.

The obtained cleaning sheet is stuck on the steel plate where oil and foreign matter are present,
After irradiating with an irradiation amount of mJ / cm ² to solidify the components, the sheet was peeled off, and the oil and foreign matter were peeled off and removed integrally with the sheet. When the residual oil on the surface was measured by infrared analysis, the removal rate was 85%.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-345015 (JP, A) JP-A-63-218359 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B08B 1/00 A47L 13/16

Claims (3)

(57) [Claims] An electronic component, a steel plate, and a plastic material.
Type, a cleaning sheet for removing oil and foreign matter remaining on during the forming processing, oil and different
A cleaning sheet comprising a support and a curable pressure-sensitive adhesive which is capable of being cured by integrating an object and a pressure-sensitive adhesive component. 2. The cleaning sheet according to claim 1, wherein the curable pressure-sensitive adhesive is a light-curable pressure-sensitive adhesive. 3. A method for forming electronic parts, steel plates, and plastic materials.
What is claimed is: 1. A cleaning method for removing oil or foreign matter remaining during processing of a mold and forming, comprising at least the following means. 1) Electronic parts, steel plate, plastic material molding, molding
Means for adhering a cleaning sheet, in which a curable pressure-sensitive adhesive that can be cured by integrating the oil or the foreign material and the pressure-sensitive adhesive component is provided on a support at a portion where the oil or the foreign material remaining during the processing of the mining is present. 2) means for integrating and curing the oil or foreign matter with the adhesive component; 3) means for removing the oil and foreign matter integrally by peeling off the cured cleaning sheet.