Preparation method of modified polytetrafluoroethylene dispersion concentrated solution
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A technology of polytetrafluoroethylene and tetrafluoroethylene, which is applied in the field of preparation of modified polytetrafluoroethylene dispersion concentrate, to achieve the effects of strong yellowing resistance, improved application performance, and improved gloss
Inactive Publication Date: 2018-02-02
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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However, in the disclosed technical scheme, it only introduces the addition of modified monomers during the polymerization process, homopolymerizes first and then copolymerizes, and only introduces the glossiness of the dispersed concentrate
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Embodiment 1
[0029] This embodiment relates to a method for preparing a modified polytetrafluoroethylene dispersion concentrate, comprising the following steps:
[0030] 1) Clean the 50L stainless steel autoclave, add 32L of deionized water, 8g of ammonium perfluorooctanoate, 8g of succinic acid, and 2kg of paraffin, seal the autoclave, evacuate and replace with nitrogen, and analyze the oxygen content until the oxygen content is ≤30ppm;
[0031] 2) Add 15g of modified monomer A (PPVE), raise the temperature of the reaction kettle to 78±1°C, put in the gas phase monomer tetrafluoroethylene, and add 0.15g of ammonium persulfate to the pressure of 1.6MPa in the kettle. During the reaction, the pressure in the kettle was maintained at 1.6MPa, and the temperature was 80-90°C. According to the change of the polymerization speed, the initiator can be added appropriately, and the number of additions depends on the reaction speed. When the tetrafluoroethylene feeding amount reaches 5.5Kg, stop st...
Embodiment 2
[0037] This embodiment relates to a method for preparing a modified polytetrafluoroethylene dispersion concentrate, comprising the following steps:
[0038] 1) Clean the 50L stainless steel autoclave, add 32L of deionized water, 8g of ammonium perfluorooctanoate, 8g of succinic acid, 2kg of paraffin, seal the autoclave, evacuate and replace with nitrogen, analyze the oxygen content until the oxygen content is ≤30ppm;
[0039] 2) Add 15 g of modified monomer A (HFP). The temperature of the reaction kettle was raised to 78±1°C, the gas-phase monomer tetrafluoroethylene was put in, and the pressure inside the kettle was 1.6MPa, and 0.15g of ammonium persulfate was added. During the reaction, the pressure in the kettle was maintained at 1.6MPa, and the temperature was 80-90°C. According to the change of the polymerization speed, the initiator can be added appropriately, and the number of additions depends on the reaction speed. When the tetrafluoroethylene feeding amount reaches...
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Abstract
The invention relates to a preparation method of a modified polytetrafluoroethylene dispersion concentrated solution. The polymerization reaction is carried out in three stages: in the first stage, controlling a reaction pressure to be in a range of 1.0-1.8 MPa and adding 20-30% of tetrafluoroethylene monomers and 40-60% of modified monomers; in the second stage, controlling the reaction pressureto be in a range of 2.0-3.0 MPa and adding 60-70% of tetrafluoroethylene monomers; and in the third stage, controlling the reaction pressure to be in a range of 2.0-3.0 MPa and adding residual tetrafluoroethylene monomers and residual modified monomers. According to the method disclosed by the invention, the pressure is operated in a variable pressure mode in the polymerization process, and recycling is performed twice in an intermediate process for realize a soft-hard-soft three-layer molecular structure of particles, so that the application processing performance of the dispersed concentrated solution is improved fundamentally, and the obtained polytetrafluoroethylene dispersion concentrated solution has the characteristics of extremely high yellowing resistance, good surface glossiness,high limit film-crack thickness, high smoothness, high cracking resistance, excellent non-viscosity and the like.
Description
technical field [0001] The invention relates to a preparation method of a modified polytetrafluoroethylene dispersion concentrate, which belongs to the field of polymer materials. Background technique [0002] Due to its excellent chemical resistance, high and low temperature resistance, aging resistance, low friction, non-stickiness, and physiological inertia, PTFE has become indispensable in chemical, mechanical, electrical, construction, medical and other fields. Special material, it can be used for a long time in the temperature range of -250 ~ 250 ℃. With the rapid development of science and technology, the world economy is becoming more and more prosperous, people's life is becoming more and more colorful, the awareness of environmental protection is increasing, and the requirements for material and cultural living standards are getting higher and higher. Therefore, in order to meet people's high-level living requirements, high-function and multi-performance materials...
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