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Low-temperature-toughness peelable protective film paint and preparation method thereof

A technology for low-temperature toughness and protective coatings, which is applied in the direction of natural rubber coatings, coatings, conjugated diene coatings, etc., and can solve problems such as the reduction of protective coating performance and peelability, reduced adhesion, and coating film breakage , to achieve excellent toughness and peelability, excellent low-temperature toughness, and improve the drying rate

Inactive Publication Date: 2013-08-14
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems existing in the current peelable protective film water-based coatings are: 1. The film-forming property, cohesive force and peelability do not match, and a peeling accelerator must be added. , its products are all added with paraffin, polysilicone, fluorine and other peeling aids; or use physical means to reduce the adhesive force during peeling, such as the UV radiation used in Chinese patent CN200410022029.6 to reduce the adhesive force Method; 2. The protective performance and peelability of the protective coating outside the normal temperature range are reduced, such as excessive extension of the coating film during the high temperature period in summer, and the film fracture during the low temperature period in winter; the patent CN200710104089.6 of Rohm and Haas Company and US Patent 4, 791,151 uses multilobals (Multilobals) emulsion polymers to solve the peeling properties under extreme high temperature and high humidity conditions; in terms of low temperature, US Patent 7, 498, 382 of Japan's Honda Technological Co., Ltd. combines two different The blending of Tg acrylate emulsion improves the ductility of the protective film at low temperature, but on the other hand, the stability of the coating and the protection performance at room temperature decrease

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 100ml of styrene-butadiene rubber aqueous dispersion (the content of styrene-butadiene rubber is 15 grams, and the diameter of micelles is about 100 nanometers) into a four-necked glass reactor with a capacity of 200 ml, and then add 45 mg of ammonium persulfate initiator. The glass reactor was placed in an oil bath, and the temperature of the oil bath was set at 70 °C. Nitrogen was introduced into the reactor to remove oxygen, and the stirring rate was kept at 200 rpm. Add 3.5 grams of butyl acrylate, 2.9 grams of methyl methacrylate, 1.5 grams of glycidyl methacrylate, and 1.7 grams of acrylic acid into 50 ml of deionized water dissolved with 1 gram of emulsifier Span-60 , stirring to obtain emulsified monomer. Then, the emulsified monomer was added dropwise into the reactor, and the dropwise addition of the monomer was completed within 1 hour, and then the temperature of the oil bath was raised to 75° C., and the reaction was continued for 2 hours to obtain a co...

Embodiment 2

[0030] Add 100ml of natural rubber latex aqueous dispersion (natural rubber content is 6 grams, micelle diameter is about 300 nanometers) into a 200 ml four-neck glass reactor, nitrogen is introduced into the reactor, and the stirring rate is kept at 200 rpm, and then added 45 mg ammonium persulfate initiator. Add 3.2 grams of butyl acrylate, 3.1 grams of vinyl acetate, 1.5 grams of acrylic acid, 0.5 grams of hydroxyethyl acrylate and 1.4 grams of glycidyl methacrylate to 50 ml of 0.9 grams of Tween-21 In the aqueous solution, the emulsified monomer is obtained after stirring. Subsequent synthesis steps are the same as in Example 1.

[0031] Coating preparation: disperse hydroxyethyl cellulose, polyvinyl alcohol, anti-aging agent (a mixture of antioxidant 1010 and hindered amine 622) and polysiloxane defoamer in deionized water to form a mother liquor. Add the auxiliary agent mother liquor to the filtered copolymer emulsion under the stirring state, and the total amount of t...

Embodiment 3

[0033]Add 50ml of styrene-butadiene rubber aqueous dispersion (the content of styrene-butadiene rubber is 10 grams) into a 200-ml glass reactor, and then add 45 mg of ammonium persulfate. The reactor was placed in an oil bath and the temperature was set at 70 °C. Nitrogen was blown in and the stirring rate was maintained at 200 rpm. Add 5.4 grams of methyl methacrylate, 6.5 grams of ethyl acrylate, 2.7 grams of glycidyl methacrylate, 0.8 grams of hydroxyethyl acrylate, 2.2 grams of methacrylic acid and 1.2 grams of emulsifier Span-60 into 100 ml of deionized In water, stir to obtain emulsified monomer. 40 ml of the emulsifying monomer was directly added to the reactor, and the remaining part was added dropwise within 45 minutes, then the temperature was raised to 75° C., and the reaction was continued for 2 hours to obtain a copolymer emulsion.

[0034] When preparing the coating, disperse silica in water, then add anti-aging agent (a mixture of antioxidant 264 and hindered ...

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Abstract

The invention belongs to the technical field of protective film paints, and particularly relates to a low-temperature-toughness peelable protective film paint and a preparation method thereof. The preparation method comprises the following steps: carrying out seed emulsion polymerization on raw materials emulsified rubber and polymerizable monomer to obtain a copolymer emulsion, wherein the particles of the copolymer emulsion are in a core-shell structure; and regulating the copolymer emulsion to obtain the low-temperature-toughness peelable protective film paint. The paint provided by the invention is suitable for air spraying construction, has high drying rate, and forms a peelable film after drying. The peelable protective film provided by the invention has excellent toughness and peelability at low temperature, can be used in a cold environment, and has wider application range. The peelable protective film paint provided by the invention can be used for transitional protection on fine surfaces of automobile paint films, automobile plastic parts, metal polishing sheets, camera lenses and the like.

Description

technical field [0001] The invention belongs to the technical field of protective film coatings, and in particular relates to a low-temperature tough peelable protective film coating and a preparation method thereof. Background technique [0002] During the circulation of goods, it is very necessary to provide temporary transitional protection for fine surfaces such as automobile paint film, automobile plastic parts, metal polished plates, photographic lenses and refrigerator shells, so as to avoid scratches, pollution and ultraviolet rays on these fine surfaces. , Acid rain corrosion. At present, the protection method is mainly spraying protective wax, which needs (water washing, pickling, alkali washing), or adopts prefabricated film type, or adopts peelable oily or water-based protective film paint. Peelable protective film coatings are attracting attention due to their ease of application and easy removal. [0003] According to reports, the base resins of developed wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D109/08C09D133/08C09D107/02C09D109/04C09D7/12C08F220/18C08F220/14C08F220/32C08F220/06C08F218/08C08F220/28C08F220/04C08F2/30
Inventor 倪秀元邹城赵琳王璐
Owner FUDAN UNIV
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