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Preparation method of high-strength fluorine-containing polymer

A polymer, high-strength technology, applied in the field of preparation of high-strength fluoropolymers, to achieve the effects of good anti-aging properties, good mechanical properties and simple process

Inactive Publication Date: 2014-04-09
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its strength and elongation still need to be further improved.

Method used

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  • Preparation method of high-strength fluorine-containing polymer

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Embodiment 1

[0022] Fluoropolymers were prepared in a 10 L reactor.

[0023] 5L of deionized water and 2g of ammonium perfluorooctanoate were added to the reactor. The reactor should be evacuated, and when the oxygen content is ≤50ppm, add 5g of borax and 5ml of diethyl malonate (chain transfer agent). The contents of the reactor were heated to 56°C. The reactor pressure was increased to 3.2MPa with a mixed monomer containing 55mol% 1,1-difluoroethylene (VDF), 10mol% tetrafluoroethylene (TFE), and 35mol% chlorotrifluoroethylene (CTFE). Stirring is carried out at a rate of 88r / min, and the pressure of the reactor is controlled within 3.2±0.02MPa.

[0024] Add 1g of potassium persulfate to start the reaction. After the polymerization reaction starts, the absolute pressure in the reactor is maintained at 3.2±0.02MPa by supplementing the mixed monomers. The reaction time is about 10h, and the solid content of the emulsion reaches about 30% (mass percentage). , to end the polymerization reac...

Embodiment 2

[0026] According to the method of Example 1, a fluoropolymer was prepared. The difference is that the emulsifier is sodium perfluorooctanoate. The molar ratio of 1,1-difluoroethylene, tetrafluoroethylene, and chlorotrifluoroethylene is 10:1:5. The polymerization reaction temperature of the present invention is controlled at 60° C., and the pressure is controlled at 3.5 MPa. The chain transfer agent is diethyl succinate.

Embodiment 3

[0028] According to the method of Example 1, a fluoropolymer was prepared. The difference is that the emulsifier is sodium perfluorooctanoate. The molar ratio of 1,1-difluoroethylene, tetrafluoroethylene, and chlorotrifluoroethylene is 12:3:8. The polymerization reaction temperature of the present invention is controlled at 70° C., and the pressure is controlled at 3.3 MPa. The chain transfer agent is diethyl succinate.

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Abstract

The invention relates to a preparation method of a high-strength fluorine-containing polymer. The method comprises the following steps: 1) adding water and an emulsifier to a reactor, and evacuating until the oxygen content is smaller than or equal to 50ppm; 2) continuing to add a pH regulator and a chain transfer agent; 3) heating the reactor to 40-60 DEG C, and adding a mixed monomer composed of 1,1-difluoroethylene, tetrafluoroethylene and trifluorochloroethylene; 4) adding an initiator, beginning polymerization reaction, and lastingly adding the mixed monomer to maintain the pressure inside the reactor constant in the polymerization reaction; and 5) finishing the polymerization reaction when the solid content of a polymer emulsion achieves 25-35% by mass, freezing and condensing the emulsion, washing and drying, so as to obtain the fluorine-containing polymer which is relatively high in strength, good in ageing resistance, and good in mechanical property and has the molecular weight of 150,000-300,000. The preparation method of the fluorine-containing polymer, which is disclosed by the invention, is fewer in raw materials, simple in technology, and applicable to large-scale popularization.

Description

technical field [0001] The invention relates to a preparation method of a high-strength fluorine-containing polymer, which belongs to the field of polymer materials. Background technique [0002] Due to its good anti-aging properties, high density, and good mechanical properties, fluoropolymers are used as the main adhesive or coating in the formulation of nuclear weapon explosives at home and abroad, such as PBX-9502 in the United States , LX-17 explosives. Fluorine-containing polymers mainly play the role of bonding and coating simple explosives, and their properties have a great influence on the molding, mechanics, processing and environmental adaptability of explosives. They are key materials for nuclear weapon explosive components. [0003] CN1692132A discloses a fluoropolymer comprising repeating units derived from tetrafluoroethylene (TFE), hexafluoropropylene (HFP), difluoroethylene (VDF), chlorotrifluoroethylene (CTFE) , has good bonding properties. However, its ...

Claims

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Application Information

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IPC IPC(8): C08F214/22C08F214/18C08F214/26C08F2/38
Inventor 余金龙张建新李斌王先荣兰军张廷健曾波白鲸赵媛媛
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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