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Styrene acrylic emulsion with gradient damping structure and bakeable high-build waterborne damping coating and preparation

A damping structure, styrene-acrylic emulsion technology, applied in the coating and other directions, can solve the problems of adverse effects of paint film performance, skinning, and the inability of moisture to separate out of thick coating films, and achieve the effect of widening the effective damping temperature range.

Active Publication Date: 2019-06-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the quick-drying performance of the paint in the thick coating state by adding an appropriate amount of surfactants, but the addition of surfactants will adversely affect the performance of the paint film during the later use of the paint film, and the medium resistance of the paint film and Durability to be investigated
[0008] Baking and quick-drying treatment of conventional water-based damping coatings in a thick coating state will cause surface crusting, blistering, cracks, etc., which will seriously affect the use of coatings
In the automobile manufacturing industry, the manufacturing process is continuous production. The water-based damping coating is open for less than 10 minutes from spraying to baking, and then enters the high-temperature drying tunnel (temperature 140°C-160°C). The surface dries quickly and skins form quickly, resulting in the inability to separate out the water in the thick coating film and causing defects in the coating film. Therefore, the current thick build water-based damping coating cannot be widely used in the field of automobile manufacturing

Method used

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  • Styrene acrylic emulsion with gradient damping structure and bakeable high-build waterborne damping coating and preparation
  • Styrene acrylic emulsion with gradient damping structure and bakeable high-build waterborne damping coating and preparation
  • Styrene acrylic emulsion with gradient damping structure and bakeable high-build waterborne damping coating and preparation

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preparation example Construction

[0071] A kind of synthetic method that possesses gradient structure styrene-acrylic emulsion, comprises the following steps:

[0072] According to a certain ratio, the monomers are mixed to form a monomer mixture I, and according to a certain ratio, an emulsifier, deionized water, and monomers are made into a pre-emulsion II, wherein I and II contain monomers of styrene and methyl methacrylate ester, n-butyl acrylate, methacrylamide, (meth)acrylic acid, glycidyl methacrylate.

[0073] Add monomers, emulsifiers, pH regulators and deionized water in a certain proportion to the reaction kettle to prepare the primer liquid, and stir and remove oxygen at a certain temperature under a nitrogen atmosphere.

[0074] Add ammonium persulfate and sodium bisulfite initiator aqueous solution respectively, keep warm for 0.5-1 hour to obtain seed emulsion.

[0075] Using the power-level feeding method, add the monomer mixture I and the pre-emulsion II dropwise. By controlling the flow rate...

Embodiment 1

[0077] First, 4.52 parts of styrene, 4.52 parts of methyl methacrylate, 9.71 parts of n-butyl acrylate, 0.12 parts of acrylic acid, 0.25 parts of methacrylamide, 0.36 parts of glycidyl methacrylate, 2.53 parts of TX-21, 5.06 parts Sodium dodecylbenzenesulfonate, 0.98 parts of sodium bicarbonate, 365 parts of deionized water are mixed evenly and then added to the reaction kettle. Turn on the stirring device and adjust the speed to 340r / min and the heating device to 80°C. Stir for 30 minutes under nitrogen atmosphere . Dissolve 0.0281 parts of ammonium persulfate and 0.0281 parts of sodium bisulfite in 5 parts of water, respectively, and directly add to the reaction kettle, and ripen for 30 minutes to obtain a seed emulsion.

[0078] 85.86 parts of styrene, 85.86 parts of methyl methacrylate, 184.54 parts of n-butyl acrylate, 2.31 parts of acrylic acid, and 6.95 parts of glycidyl acrylate were mixed by mechanical stirring and then added 4.63 parts of methacrylamide (4.63 parts o...

Embodiment 2

[0084] First, 4.52 parts of styrene, 4.52 parts of methyl methacrylate, 9.71 parts of n-butyl acrylate, 0.12 parts of acrylic acid, 0.25 parts of methacrylamide, 0.24 parts of glycidyl methacrylate, 2.53 parts of TX-21, 5.06 parts Sodium dodecylbenzenesulfonate, 0.98 parts of sodium bicarbonate, 365 parts of deionized water are mixed evenly and then added to the reaction kettle. Turn on the stirring device and adjust the speed to 340r / min and the heating device to 80°C. Stir for 30 minutes under nitrogen atmosphere . Dissolve 0.0281 parts of ammonium persulfate and 0.0281 parts of sodium bisulfite in 5 parts of water, respectively, and directly add to the reaction kettle, and ripen for 30 minutes to obtain a seed emulsion.

[0085] 85.86 parts of styrene, 85.86 parts of methyl methacrylate, 184.54 parts of n-butyl acrylate, 2.31 parts of acrylic acid, and 4.63 parts of glycidyl acrylate were mixed by mechanical stirring and then added 4.63 parts of methacrylamide (4.63 parts o...

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Abstract

The invention discloses a styrene acrylic emulsion with a gradient damping structure and a bakeable high-build waterborne damping coating and preparation, and belongs to the field of waterborne coatings. The bakeable high-build waterborne damping coating is prepared from the styrene acrylic emulsion with the gradient damping structure, water, a wetting dispersant, coalescing agents, a thickening agent, a flatting agent, mica powder, calcium carbonate, graphite and functional filler. According to the styrene acrylic emulsion with the gradient damping structure, the internal molecular structuresof emulsion particles prepared through a power level charging method change continuously, and the emulsion particles are distributed in a gradient change mode from interior to exterior styrene. The phenomena that an existing waterborne damping coating is baked within short open time in the thick coating state, and the surfaces generate foams, crust, crack and have other defects are avoided. The waterborne damping coating is subjected to disposable scraping and spraying, and the thickness of a wet film can reach 3 mm or above. The coating has the excellent rheological property, the shear thinning is obvious, the good sagging resistance is achieved, the good damping performance is achieved, and the emulsion can be applied to the fields of automobile manufacturing and the like needing rapiddrying of the waterborne damping coating.

Description

technical field [0001] The invention belongs to the field of water-based paint, and provides a preparation method of a styrene-acrylic emulsion with a gradient damping structure and a bakeable, quick-drying thick-build water-based damping paint. The water-based damping paint provided by the invention can be used as damping materials in industries such as automobiles, high-speed rail, large machinery and aircraft. Background technique [0002] With the gradual strictness of national environmental protection policies, the coatings industry is facing a transition to water-based coatings. Water-based damping coatings, as a type of environmentally friendly coatings, can effectively reduce the vibration generated during the operation of mechanical equipment and achieve the effect of vibration reduction and noise reduction. As the film-forming substance of water-based damping coatings, water-based resin emulsion is the main provider of the coating's damping performance, and the qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F265/06C08F212/08C08F220/14C08F220/18C08F220/06C08F220/32C08F220/56C08F4/40C08F2/30C08F2/26C09D151/00C09D7/61C09D7/65
CPCC08F4/40C08F265/06C08K2003/265C08K2201/014C08L2205/16C09D151/003C09D7/61C09D7/65C09D7/70C08L23/12C08K13/04C08K3/34C08K3/26C08K7/24C08F220/1804
Inventor 李效玉王飞邱藤
Owner BEIJING UNIV OF CHEM TECH