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Fluorine-containing acrylate-based random copolymer, preparation method and uses thereof

A technology of random copolymers and acrylates, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as high viscosity of the system, coating defects, and affecting paint film performance, and achieve strong foam suppression and rapid elimination The effect of foam performance

Active Publication Date: 2019-04-02
SANMING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some high-end special coatings, such as high-end polyurethane automotive coatings, due to the large amount of surfactants, the foam stabilization is very strong; in addition, due to the fast curing speed, many foams have been cured before they can be removed, resulting in coating defects , such as dark bubbles, craters and other ills
In some high-solid epoxy floor paints, printed circuit board (PCB) inks, electronic potting adhesives, and unsaturated polyester systems, it is difficult for tiny foams to be removed from the system quickly due to the high viscosity of the system out, seriously affecting the performance of the paint film
However, the current commercial defoamer products do not solve these problems well.

Method used

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  • Fluorine-containing acrylate-based random copolymer, preparation method and uses thereof
  • Fluorine-containing acrylate-based random copolymer, preparation method and uses thereof
  • Fluorine-containing acrylate-based random copolymer, preparation method and uses thereof

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preparation example Construction

[0046] The present invention also provides a method for preparing a fluorine-containing acrylate random copolymer, comprising the following steps:

[0047] S1, heat up the solvent to 80-140°C;

[0048] Specifically, first add a suitable solvent into a four-necked flask equipped with a thermometer, mechanical stirring, and a condenser, blow nitrogen into it, and raise the temperature of the solvent to 80-140°C.

[0049] Further, in step S1, the solvent is selected from ethyl acetate, butyl acetate, octyl acetate, isooctyl acetate, propylene glycol methyl ether acetate, DBE, toluene, xylene, mesitylene, white oil one or several.

[0050] S2. Mix the monomer component A, the monomer component B and the initiator to obtain a mixed solution, put the mixed solution into a funnel, and drop it into the heated solvent within 1.5 to 3 hours The copolymerization reaction obtains the fluorine-containing acrylate random copolymer. Additional initiators can be added two to three times as...

Embodiment 1

[0058] S1. Add 200g of xylene to a 500ml four-neck flask equipped with a mechanical stirrer, a condenser and a thermometer, raise the temperature to 105°C, and ventilate with nitrogen;

[0059] S2. Mix 125g of lauryl methacrylate, 125g of trifluorooctyl methacrylate and 2.5g of BPO evenly, drop them into the flask within 2h, and react for 1h. Then add 25g of xylene and 0.25g of BPO within 10min and keep warm for 1h. Then add 25g of xylene and 0.25g of BPO within 10min, and keep warm for 3h to obtain a colorless and transparent product. GPC test molecular weight, Mn=68000, PDI=2.1.

Embodiment 2

[0061] S1. Add 200 g of trimethylbenzene into a 500 ml four-necked flask equipped with mechanical stirring, a condenser, and a thermometer, raise the temperature to 105° C., and ventilate with nitrogen;

[0062] S2. Mix 125g of isooctyl methacrylate, 125g of trifluorooctyl methacrylate and 2g of BPO evenly, drop them into the flask within 2h, and react for 1h. Then add 25g of trimethylbenzene and 0.25g of BPO within 10min and keep warm for 1h. Then add 25g of trimethylbenzene and 0.25g of BPO within 10min, and keep warm for 3h to obtain a colorless and transparent product. GPC test molecular weight, Mn=71000, PDI=2.2.

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Abstract

The invention relates to a fluorine-containing acrylate-based random copolymer, which has a number average molecular weight of 20000-500000 and molecular weight distribution of 1.6-3, and is obtainedby carrying out free radical copolymerization on 40-80 wt% of a monomer component A and 20-60 wt% of a monomer component B, wherein the monomer component A is fluorine-containing (meth)acrylate, and the monomer component B is C8-C30 alkyl (meth)acrylate. The invention further relates to a preparation method of the fluorine-containing acrylate-based random copolymer, wherein the preparation methodcomprises: heating a solvent to a temperature of 80-140 DEG C, mixing the monomer component A, the monomer component B and an initiator to obtain a mixed solution, adding the mixed solution into the heated solvent in a dropwise manner within 1.5-3 h, and carrying out a copolymerization reaction to obtain the fluorine-containing acrylate-based random copolymer. The invention further relates to usesof the fluorine-containing acrylate-based random copolymer as an anti-foaming agent in coating materials, inks or plastic materials. According to the present invention, the fluorine-containing acrylate-based random copolymer has advantages of strong foam inhibition and defoaming performance and good system compatibility, the preparation is simple, and the continuous production can be achieved.

Description

technical field [0001] The invention relates to the technical field of acrylate random copolymers, and in particular to a fluorine-containing acrylate random copolymer, a preparation method and an application thereof. Background technique [0002] In the process of paint production and painting, due to mechanical stirring and brushing, roller coating, spraying, etc., air is brought in, generating air bubbles, pigments will also absorb air, and substrates, such as wood and concrete, will also absorb air. In addition, there are some reactive bubbles, such as the reaction of polyurethane and water, the reaction of unsaturated polyester and catalyst, etc. will produce bubbles. Usually, if it is a pure liquid, these air bubbles are easily eliminated. However, in the formulation of coatings, inks, etc., and composite materials, some surfactants, such as silicone leveling agents, wetting agents, dispersants, etc., will be used. These surfactants will form an electric double layer ...

Claims

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Application Information

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IPC IPC(8): C08F220/18C08F220/24C09D7/65C09D175/04C08L63/00
CPCC09D7/65C09D175/04C08F220/18C08F220/24C08L63/00C08L2205/025C08L2205/03C08F220/1812C08F220/1818C08F220/1808C08L33/16
Inventor 程德书罗菊香李奇勇念保义肖旺钏龙欣
Owner SANMING UNIV
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