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A kind of aqueous fluorine-containing dispersion liquid and its preparation method and application

A dispersion, water-based technology, applied in the field of aqueous fluorine-containing dispersion and its preparation, can solve the problems of film-forming difference, phase transfer, no chemical bond connection, etc.

Active Publication Date: 2019-08-06
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the huge difference in polarity and film-forming properties between the fluorine-containing particle seeds and the outer layer acrylate copolymer, there is no chemical bond connection, which causes phase transfer during the coating process and cannot form a firm film.
In addition, patent CN201080011325 uses a combination of olefinic double bond-containing reactive type, aliphatic surfactant and fluorosurfactant as a polymeric emulsifier to replace perfluorooctanoic acid to reduce costs and increase the number of particles per unit. Fluorine or part of it contains fluorine, and the molecular chain contains active hydrogen for chain transfer, which will adversely affect the polymerization reaction of fluorine-containing olefin monomers initiated by free radicals, and will cause the reaction to be slow or directly terminate the reaction. The reaction time is close to 10h, which is also The main reasons for using seed polymerization instead of direct copolymerization to achieve acrylic modified fluoropolymers

Method used

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  • A kind of aqueous fluorine-containing dispersion liquid and its preparation method and application
  • A kind of aqueous fluorine-containing dispersion liquid and its preparation method and application
  • A kind of aqueous fluorine-containing dispersion liquid and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] A preparation method of an aqueous fluorine-containing dispersion liquid, comprising the steps of:

[0090] (1) In the 10L stainless steel reactor with agitator, add 5.0kg deionized water, 100g mass concentration is the aqueous solution of 10% perfluorocarboxylate polyether ammonium salt, extract the air in the reactor with vacuum pump, then Replace with nitrogen, repeat nitrogen filling and evacuation and degassing until the oxygen content reaches below 30ppm, and then replace with the reaction monomer until the oxygen content in the reactor drops below 30ppm. Then start stirring, raise the temperature to 80° C., and add VDF / TFE / HFP (75 / 10 / 15 mol%) mixed monomers into the reactor through a compressor until the pressure of the reactor reaches 2.0 MPa. After the temperature and pressure are stabilized, add 30g of perfluorobutadiene and 100g of K with a mass concentration of 10% through a metering pump 2 S 2 o 8 aqueous solution to start the reaction. The reacted mono...

Embodiment 2

[0095]According to the method of embodiment 1, change step (1) fluorine-containing monomer to be VDF / TFE / CTFE (80 / 10 / 10, mol%), the reaction time is 2.2h, the solid content that obtains fluorine-containing seed polymer emulsion is 47.1%, the particle size is 122nm, and the calculated latex particle concentration is 2.75×1014 (piece / 1g emulsion).

[0096] Step (2) According to the method of Example 1, an aqueous fluorine-containing dispersion liquid with a solid content of 44.9%, an average particle diameter of 151 nm, and a mechanical stability of 352 s was obtained.

[0097] Using the same performance measurement method as in Example 1, it was detected that the light transmittance of the paint film prepared from the dispersion was 93.8%, the tensile strength was 12.3 MPa, and the elongation at break was 510%.

Embodiment 3

[0099] According to the method of embodiment 1, change step (1) perfluorobutadiene to 50g perfluoroethylene propylene ether, other unchanged, reaction time is 2.6h, the solid content that obtains fluorine-containing seed polymer emulsion is 46.3%, grain The diameter is 102nm, calculated to be 4.63×1014 (unit / 1g emulsion).

[0100] Step (2) According to the method of Example 1, an aqueous fluorine-containing dispersion liquid with a solid content of 43.9%, an average particle diameter of 121 nm and a mechanical stability of 392 s was obtained.

[0101] Using the same performance measurement method as in Example 1, it was detected that the light transmittance of the paint film prepared from the dispersion was 95.4%, the tensile strength was 10.3 MPa, and the elongation at break was 580%.

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Abstract

The invention relates to the technical field of fluorine chemical industry and particularly relates to an aqueous fluorine-containing dispersion solution as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) taking fluorine-containing olefin monomers and perfluorinated diene as raw materials and carrying out emulsion polymerization to obtain a fluorine-containing seed polymer emulsion; and (2) taking the fluorine-containing seed polymer emulsion and fluorine-free olefin monomers as the raw materials and carrying out emulsion polymerization to obtain the aqueous fluorine-containing dispersion solution. According to the preparation method, unsaturated side chains can be formed on fluorine-containing seed polymer particles in the step (1), so that the combination of the fluorine-containing seed polymers and the fluorine-free olefin monomers is effectively improved; the modification action of fluorine-free olefin on fluorine-containing polymers can be better achieved; the synergistic action between two types of monomers is achieved, so that the negative influence of fluorine-free monomers on weather resistance and the negative influence of the fluorine-containing monomers on adhesion performance are reduced. The aqueous fluorine-containing dispersion solution has high pollution resistance, stain removal performance, adhesion, weather resistance and chemical resistance; the coating of the aqueous fluorine-containing dispersion solution has high glossiness and hardness.

Description

technical field [0001] The invention relates to the technical field of fluorine chemical industry, in particular to an aqueous fluorine-containing dispersion and its preparation method and application. Background technique [0002] Due to the existence of fluorine atoms, fluorine-containing polymers are endowed with excellent weather resistance, heat resistance, chemical corrosion resistance, and flame retardancy. They are used as various coatings and are used in chemical anti-corrosion, architectural coatings, electronic appliances, medical equipment and other fields. . Among them, the polyvinylidene fluoride (PVDF) coating, which is the most widely used and used in the largest amount, is a typical representative of fluorine-containing coatings because of its excellent weather resistance. [0003] In addition to the above advantages, traditional fluorine-containing coatings are oil-soluble, have the characteristics of high VOC and high sintering temperature, and have the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F259/08C08F220/14C08F220/18C08F220/28C08F220/06C08F214/22C08F214/26C08F214/28C08F236/16C08F2/30C08F2/26C09D151/00C09D5/08C09D5/16
CPCC08F2/26C08F2/30C08F214/22C08F259/08C09D5/08C09D5/16C09D151/003C08F220/14C08F214/26C08F214/28C08F236/16
Inventor 张廷健张建新余金龙王先荣
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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