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Method for preparing multifunctional power coating additive with core-shell structure

A powder coating and core-shell structure technology, applied in powder coatings, coatings, etc., can solve the unsolved problems of dry powder fluidity, physical and chemical properties, etc., and achieve the goals of reducing appearance defects, improving leveling performance, and good dry fluidity Effect

Inactive Publication Date: 2011-05-18
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The products described in the above patent documents are mainly used as leveling agents or dry powder flow agents, or have the function of reacting, cross-linking and curing, but none of them solves the problem of the leveling of the coating film taking into account the fluidity of the dry powder and the physical and chemical properties.

Method used

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  • Method for preparing multifunctional power coating additive with core-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of a core-shell structure multifunctional powder coating additive comprises the following steps:

[0034] A. Mix 62.4g of n-butyl methacrylate (BMA), 33.6g of methyl methacrylate (MMA) and 1.9g of dodecyl mercaptan as nuclear monomers;

[0035] B. Use 20.9g n-butyl methacrylate (BMA), 23.9g methyl methacrylate (MMA), 19.2g glycidyl methacrylate (GMA) and 1.3g dodecyl mercaptan as the shell body mixed evenly;

[0036] C. Add 160 g of water, 3.2 g of sodium lauryl sulfate, and 2 g of sodium bicarbonate into a reactor equipped with a thermometer, a stirrer, a nitrogen introduction device, and a monomer feeding device, stir evenly, and heat up to 85° C. Add 1 / 3 of the mass of nucleomonomer and 0.5 g of ammonium persulfate, and react at 85° C. for half an hour. Slowly add the remaining 2 / 3 mass of nucleomonomer and 1.0 g of ammonium persulfate into the reactor dropwise for one hour, and keep the temperature at 85° C. for half an hour after the dropwise...

Embodiment 2

[0039] A. Mix 62.4g of n-butyl methacrylate (BMA), 33.6g of methyl methacrylate (MMA) and 1.9g of dodecyl mercaptan as nuclear monomers;

[0040] B. Use 7.4g of n-butyl methacrylate (BMA), 24.6g of methyl methacrylate (MMA), 32g of glycidyl methacrylate (GMA) and 1.3g of dodecyl mercaptan as shell monomers well mixed.

[0041] The acrylate core-shell polymer is spray-dried, and the spraying condition is that the air inlet temperature is 130-150°C, and the outlet air temperature is 60°C.

[0042] Other steps are the same as in Example 1.

Embodiment 3

[0044] A. Mix 62.4g of n-butyl methacrylate (BMA), 33.6g of methyl methacrylate (MMA) and 1.9g of dodecyl mercaptan as nuclear monomers;

[0045] B. Use 11.8g n-butyl methacrylate (BMA), 26.6g methyl methacrylate (MMA), 25.6g glycidyl methacrylate (GMA) and 1.3g dodecyl mercaptan as the shell Mix well.

[0046] Other steps are the same as in Example 1.

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Abstract

The invention relates to a method for preparing a multifunctional power coating additive with a core-shell structure. The method comprises the steps of: A. uniformly mixing butyl methacrylate (BMA), methyl methacrylate (MMA) and lauryl mercaptan as a core monomer; B. uniformly mixing butyl methacrylate (BMA), methyl methacrylate (MMA), glycidyl methacrylate (GMA) and lauryl mercaptan as a shell monomer; C. adding water, lauryl sodium sulfate and sodium bicarbonate in a reactor, uniformly stirring to raise temperature, dripping the core monomer and ammonium persulfate, and maintaining the temperature; dripping the shell monomer and ammonium persulfate, and maintaining the temperature; cooling and filtering to obtain white acrylic ester core-shell polymer latex, wherein the solid content in the latex is 40-50%, and the conversion rate of the monomer is higher than 90%; and D. adding a calcium chloride aqueous solution, separating, washing with water, and drying to obtain a white powdery solid product. The additive is used for power coatings without being molten and granulated, can be added directly for use, and has the environmentally friendly characteristic.

Description

technical field [0001] The invention relates to the field of powder coatings, in particular to a reactive core-shell structure acrylate copolymer, and as a multifunctional additive for powder coatings, it is used to improve the leveling and dry powder fluidity of powder coatings , Storage stability and anti-scratch properties. Background technique [0002] Additives are an indispensable and important part of powder coatings. Although the proportion of additives in powder coatings is very small, their role cannot be ignored, and sometimes they play a decisive role in the performance or appearance of the coating film. In the formulation design of powder coatings, different additives are usually added to improve various properties. Relatively speaking, resins and additives with a low glass transition temperature can reduce the melt viscosity of the powder coating, which is beneficial to the leveling and impact properties of the coating film. The storage stability of powder co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/18C08F220/14C08F220/32C08F2/26C09D7/06C09D7/12C09D5/03C09D7/47
Inventor 汪瑾周正发徐卫兵
Owner HEFEI UNIV OF TECH
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