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Polymerization and polymerization method of polytetrafluoroethylene resin for fluorine-containing functional film

A polytetrafluoroethylene and functional film technology, which is applied in the polymerization system and polymerization field of polytetrafluoroethylene resin for fluorine-containing functional films, can solve the problem that it is difficult to meet the high performance requirements of special materials such as fluorine-containing functional films, and the control stability is not stable. High performance, resin molecular weight and other problems such as large fluctuations in performance, to achieve the effect of improving yield, easy reaction process, and avoiding shortening of molecular chains

Inactive Publication Date: 2017-08-18
福建三农新材料有限责任公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Currently used in the polymerization system and polymerization method of tetrafluoroethylene dispersed resin, the control stability of the reaction process is not high, resulting in large fluctuations in the molecular weight and other properties of the resin, and it is difficult to meet the high performance requirements of special materials such as fluorine-containing functional films. Most of the materials are imported

Method used

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  • Polymerization and polymerization method of polytetrafluoroethylene resin for fluorine-containing functional film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Please refer to figure 1 , a polytetrafluoroethylene resin polymerization system for fluorine-containing functional membranes, including a reaction system, a heating system and a cooling system; the reaction system includes a horizontal reactor 11 and a spiral stirrer 12, and the spiral stirrer is horizontally arranged In the horizontal reactor, the horizontal reactor is provided with a reaction jacket 13, and the reaction jacket is connected with the heating system and the cooling system at the same time; the bottom of the reaction jacket is provided with a cold and heat medium input pipe 14 , the top of the reaction jacket is provided with a cooling and heating medium output pipe 15 . The top of the horizontal reactor is successively provided with a TFE feed pipe 111, a modified monomer feed pipe 112, an additive feed pipe 113, an ion-free water feed pipe 114, and a material A recovery pipe 115, a vacuum pipe 116 and a blasting pipe 117, a discharge pipe 118 is provi...

Embodiment 2

[0048] The method for carrying out the polymerization reaction according to the polymerization system of Example 1 comprises the following steps: adding about 50 to 70% volume of deionized water in the polymerization kettle, adding a fluorine-containing surfactant, an emulsion stabilizer, a pH regulator, and an initiator after vacuumizing. Then feed tetrafluoroethylene monomer at a feed rate of 5-30kg / min for reaction, raise the temperature at a rate of 1-10°C / min until the reaction temperature remains at 80-100°C, and control the reaction pressure to 1.8 ~2.5MPa, then lower the temperature to 60~70°C, stir at a speed of 20~80r / min during the reaction, and the finished product of polytetrafluoroethylene resin can be obtained after the reaction. The mass of the fluorine-containing surfactant is 0.05-1.5% of the mass of the water, and the mass of the emulsion stabilizer is 2-4% of the mass of the water.

[0049] details as follows:

[0050] 1. Start to heat up after the evacuat...

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Abstract

The invention provides a polymerization system and method of polytetrafluoroethylene resin for a fluorine-containing functional film, which are easy in controlling the reaction process and stable in product quality. The polymerization system comprises a reaction system, a heating system and a cooling system, wherein the reaction system comprises a horizontal reaction kettle and a spiral stirrer; the spiral stirrer is horizontally arranged in the horizontal reaction kettle; a reaction jacket which is simultaneously connected with the heating system and the cooling system is arranged outside the horizontal reaction kettle; a cooling-medium and heating-medium input pipeline is arranged at the bottom part of the reaction jacket; and a cooling-medium and heating-medium output pipeline is arranged at the top part of the reaction jacket. The polymerization system and method provided by the invention have the beneficial effects that the reaction jacket is simultaneously connected with the heating system and the cooling system, so that a heating medium is introduced into the reaction jacket in reaction and is stopped from introduction when the reaction is ended, a cooling medium is introduced into the reaction jacket, and further the reaction process is easy to control.

Description

technical field [0001] The invention relates to a polymerization method and system for a special polytetrafluoroethylene resin used in the manufacture of fluorine-containing functional membranes. Background technique [0002] Polytetrafluoroethylene (Teflon or PTFE), commonly known as "Plastic King", is a polymer compound formed by polymerization of tetrafluoroethylene monomer (TFE), with excellent chemical stability, corrosion resistance, sealing, high Lubricant non-stick properties, electrical insulation and good aging resistance. At present, it has been widely used in aviation, aerospace, atomic energy, electronics, electrical appliances, chemical industry, machinery, construction, textile, medicine and other industrial sectors, and has increasingly penetrated into people's daily life. [0003] PTFE can be obtained by two polymerization processes of suspension and dispersion. The obtained resin is dried to obtain a powder product, or concentrated to obtain a concentrated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F114/26C08F2/01C08F2/26
CPCC08F114/26C08F2/01C08F2/26
Inventor 徐美燚徐万鑫余道腾王志喜靳艾霞
Owner 福建三农新材料有限责任公司