High-gloss PTFE (polytetrafluoroethylene) anti-drop agent and preparation method thereof

An anti-drip agent, PTFE technology, applied in the field of high-gloss PTFE anti-drip agent and its preparation, can solve the problems of complex process flow, poor product quality, complicated process, etc., and achieve simple and controllable process operation and product particle size. The effect of simple control and preparation process

Active Publication Date: 2017-10-17
安徽申嘉聚合物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (4) polytetrafluoroethylene aqueous dispersion: CN98106922 discloses adding the method of adding a vacuum vent to the extruder to add polytetrafluoroethylene aqueous dispersion to obtain long-diameter relatively large fine fibers and local cross-network structures, which partially solves the problem Addition and surface defects, but the fiber-forming effect is unstable, and moisture has adverse effects on the mechanical properties of resins

Method used

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  • High-gloss PTFE (polytetrafluoroethylene) anti-drop agent and preparation method thereof
  • High-gloss PTFE (polytetrafluoroethylene) anti-drop agent and preparation method thereof
  • High-gloss PTFE (polytetrafluoroethylene) anti-drop agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] (1) Weigh 100 g of commercially available polytetrafluoroethylene emulsion with 60wt% polytetrafluoroethylene content and a particle size of 0.1-0.5um, and simultaneously weigh 6g of styrene monomer and emulsify it with 30mg sodium dodecylsulfonate Then pour it into the polytetrafluoroethylene emulsion and stir it evenly, and then place it in a gamma ray source for irradiation treatment with an absorbed dose of 100Gy.

[0046] (2) Add 60 mg of initiator potassium persulfate to the PTFE emulsion treated by (1), stir to dissolve it in the PTFE emulsion, and start heating to 85 °C after nitrogen gas for 30 minutes, and slowly add styrene dropwise after 10 minutes The monomer, the amount of styrene is 12g, after the styrene monomer is added dropwise, slowly add 2.4g of cross-linking agent divinylbenzene dropwise. Under anaerobic conditions, the stirring rate is 400-500r / min, and the grafting reaction is carried out for 10h to obtain the modified PTFE product;

[0047] (3) ...

Embodiment 2

[0049] (1) Measure 100g after diluting the commercially available PTFE emulsion with PTFE content of 60wt% and particle size of 0.1-0.5um to 5wt%, and weigh 25mg of styrene monomer at the same time, and use 25mg per thousand A sodium dodecyl sulfonate aqueous solution is emulsified and poured into a polytetrafluoroethylene emulsion and stirred evenly, and then placed in a gamma ray source for irradiation treatment with an absorbed dose of 5Gy.

[0050] (2) Add 25 mg of 1 / 1,000 ammonium persulfate aqueous solution to the PTFE emulsion treated by (1), stir to dissolve it in the PTFE emulsion, and start heating to 40 °C after 30 minutes of nitrogen gas, and start to slow down after 10 minutes. Add 50 mg of styrene monomer dropwise, and slowly add 12.5 mg of a cross-linking agent divinylbenzene solution dropwise after the addition of the monomer is completed. Under anaerobic conditions, the stirring rate is 100-150r / min, and the grafting reaction is carried out for 3 hours to obta...

Embodiment 3

[0053] (1) Dilute the commercially available PTFE emulsion with a polytetrafluoroethylene content of 60wt% and a particle size of 0.1-0.5um to 40wt% and measure 100g, and weigh 0.4g of acrylonitrile monomer at the same time, emulsify with 1mgOSP1380 Pour it into the polytetrafluoroethylene emulsion and stir evenly, then place it in a gamma ray source for irradiation treatment, and the absorbed dose is 50Gy.

[0054] (2) Add 4 mg of initiator ammonium persulfate to the PTFE emulsion treated by (1), stir to dissolve it in the PTFE emulsion, and start heating to 50 °C after nitrogen gas for 30 minutes, and slowly add acrylonitrile dropwise after 10 minutes 4 g of monomers, after the addition of the monomers, slowly add 40 mg of the cross-linking agent triallyl isocyanurate dropwise. Under anaerobic conditions, the stirring rate is 300-400r / min, and the grafting reaction is carried out for 4 hours to obtain the modified PTFE product;

[0055] (3) Filter the modified PTFE product,...

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Abstract

The invention relates to a high-gloss PTFE (polytetrafluoroethylene) anti-drop agent and a preparation method thereof. The preparation method includes: 1), adding a small amount of an emulsified monomer A solution to a PTFE emulsion and performing irradiation treatment on the PTFE emulsion in high energy ray, and grafting a small number of monomers on the surface of PTFE particles; 2), in the absence of oxygen, initiating monomer B to perform polymerization reaction in the treated PTFE emulsion by the aid of an initiator and adding a cross-linking agent at a later stage to form nuclear-shell nano PTFE composite particles with PTFE particles as nuclears and a polymer as a shell; 3), filtering the modified PTFE emulsion and subjecting a filtrate to spray drying to obtain the high-gloss PTFE anti-drop agent. With the method, under the condition that no dispersants or compatibility agents are added, the anti-drop agent can be well-dispersed in thermoplastic resin with good compatibility, and light transmission, glossiness and the like of matrix resin are unaffected by the anti-drop agent dispersed in engineering plastics of PA, PC and the like.

Description

technical field [0001] The invention relates to a high-gloss PTFE anti-dripping agent and a preparation method thereof. Background technique [0002] Anti-dripping agent products are developed from the continuous improvement of plastic flame retardancy and modification requirements. In the early days, products such as chlorinated polyethylene and silicone rubber were used, but there were problems such as environmental protection, operability and migration, and were gradually replaced by high molecular weight PTFE. Instead, become the mainstream of the market. It uses the fiber-forming principle of high-molecular-weight amorphous PTFE to form a network structure during the extrusion process to enhance the melt elastic strength of the polymer to achieve the effect of anti-dripping. In theory, various forms of high-molecular-weight amorphous Both PTFE can play a role. Crystalline PTFE and high-temperature sintered PTFE cannot be used for anti-dripping due to their insolubility...

Claims

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Application Information

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IPC IPC(8): C08F285/00C08F259/08C08F212/08C08F212/36C08F2/46C08F2/54C08F2/26C08F2/30C08L51/00C08L69/00
Inventor 吴国忠
Owner 安徽申嘉聚合物科技有限公司
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