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Water-based strippable coating and preparation method thereof

A water-based and coating technology, applied in the direction of coating, etc., can solve the problems of serious environmental pollution, poor peelability, low coating film strength, etc., and achieve the effect of high coating film strength, reduced adhesion, and soft copolymer molecular segments

Inactive Publication Date: 2018-07-20
CHANGZHOU SIYU ENVIRONMENTAL PROTECTION MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a water-based peelable paint and its preparation method for the problems of using a large amount of organic solvents in the paint, seriously polluting the environment, low strength of the coating film, and poor peelability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] Mix 300g starch with 100mL deionized water, stir at 300r / min for 20min and use 60Co-γ rays were irradiated 3 times, the energy was controlled to be 0.50PBq each time, and the dose was 20kGy each time, then 30g of epichlorohydrin was added, heated to 30°C, and stirred at 200r / min for 5h to obtain modified starch. Add 100g of modified starch to 2L of deionized water, stir at 300r / min for 20min, heat to 80°C under nitrogen atmosphere, stir for 20min to gelatinize, add 4g of ammonium persulfate, continue stirring for 30min, then add 150g of butyl acrylate, 150g Methyl methacrylate, react at 70°C for 3h, after cooling to room temperature, add absolute ethanol until no precipitation occurs, filter to obtain the filter residue, wash the filter residue twice with absolute ethanol, then place it in a drying oven, at 50°C Dry for 2 hours to obtain starch-based acrylate copolymer. Take 50g of starch-based acrylate copolymer and 2g of emulsifier, add it to 150mL of deionized water,...

example 2

[0031] Mix 400g starch with 120mL deionized water, stir at 350r / min for 25min and use 60 Co-γ-ray irradiation 4 times, control the energy of each time to 0.65PBq, each time the dose is 30kGy, then add 40g of epichlorohydrin, and heated to 35 ° C, stirred at 250r / min for 5.5h, to obtain modified starch, Take 150g of modified starch, add 3L of deionized water, stir at 350r / min for 25min, heat to 85°C under nitrogen atmosphere, stir and gelatinize for 25min, add 6g of ammonium persulfate, continue stirring for 35min, then add 200g of butyl acrylate, 200g of methyl methacrylate, react at 75°C for 4h, after cooling to room temperature, add absolute ethanol until no precipitation occurs, filter the filter residue, wash the filter residue twice with absolute ethanol, put it in a drying oven, and dry it at 55°C Dry it under the sun for 3 hours to obtain a starch-based acrylate copolymer. Take 80g of starch-based acrylate copolymer and 3g of emulsifier, add it to 200mL of deionized wat...

example 3

[0033] Mix 450g starch with 150mL deionized water, stir at 400r / min for 30min and use 60 Co-γ rays were irradiated 5 times, the energy was controlled to be 0.75PBq each time, and the dose was 40kGy each time, then 45g of epichlorohydrin was added, heated to 40°C, and stirred at 300r / min for 6h to obtain modified starch. Add 200g of modified starch to 4L of deionized water, stir at 400r / min for 30min, heat to 90°C under nitrogen atmosphere, stir for 30min to gelatinize, add 8g of ammonium persulfate, continue stirring for 40min, then add 300g of butyl acrylate, 300g Methyl methacrylate, react at 80°C for 5h, after cooling to room temperature, add absolute ethanol until no precipitation occurs, filter to obtain the filter residue, wash the filter residue with absolute ethanol 3 times and place it in a drying oven, at 60°C Dry for 4 hours to obtain a starch-based acrylate copolymer, take 100g of starch-based acrylate copolymer, 4g of emulsifier, add 300mL of deionized water, stir...

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Abstract

The invention relates to a water-based strippable coating, and belongs to the technical field of strippable coatings. A starch-based acrylate copolymer is used as a film-forming substance, starch is irradiated with rays to destroy the regular structure of starch molecules, reduce the rigidity of the starch molecules, change the structure of the starch molecules, fracture an original polymer main chain and generate a new crosslink bond, the new crosslink bond is crosslinked with epichlorohydrin to destroy the intramolecular and intermolecular hydrogen bonds of the starch, enhance the plasticityand the flexibility of the starch and reduce the brittleness, soft and hard monomer grafting is performed to adjust the hardness and the flexibility of a film formed by the coating, the starch-basedacrylate copolymer is compounded with an aqueous acrylic emulsion to endow a resin system with good chemical resistance and strippability, and no film forming additive is needed in the resin film forming process to achieve the great reduction of the VOC content of the coating system and the improvement of the environmental protection grade, so the water-based strippable coating with the advantagesof low VOC, environmental protection and high weather resistance is prepared.

Description

technical field [0001] The invention relates to a water-based peelable paint and a preparation method thereof, belonging to the technical field of peelable paint. Background technique [0002] During the process of transportation, storage, processing and assembly of materials, instruments and parts, etc., they are easy to be scratched, [0003] Abrasion and pollution are also susceptible to erosion by salt spray, moisture, acid rain, microorganisms, etc., resulting in chemical corrosion and electrochemical corrosion, affecting the appearance of the equipment and even degrading its performance. In order to reduce these damages and prolong the service life of the equipment, it is necessary to effectively seal and protect the equipment. For raw materials and semi-finished products, follow-up processing or assembly processes are required, and the surface is required to be kept clean, so it cannot be protected by spraying anti-rust paint. Using a peelable protective film is the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/00C09D5/20C09D7/61C09D7/63C08F251/00C08F220/14C08F220/18C08B31/00
CPCC08B31/003C08F251/00C08K2003/2241C08K2003/3045C08L2205/035C09D5/20C09D133/00C08L51/02C08K13/02C08K3/30C08K5/42C08K3/22C08K3/34C08F220/1804
Inventor 王之霖陈倩
Owner CHANGZHOU SIYU ENVIRONMENTAL PROTECTION MATERIAL SCI & TECH
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