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Modified polytetrafluoroethylene (PTFE) and preparation method and application thereof

A polytetrafluoroethylene, modified technology, applied in the field of modified polytetrafluoroethylene and its preparation and application, can solve the problems of poor free flow, difficult storage and handling, high self-adhesiveness, etc., to achieve easy control and convenient storage , Improve the effect of mechanical properties

Inactive Publication Date: 2011-05-25
SHANGHAI ENTROPY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above are all powders obtained by co-precipitation. The disadvantages of this powder are: high self-adhesiveness (especially in high polytetrafluoroethylene, such as when the weight ratio of polytetrafluoroethylene is 25%), poor free flow ( make it difficult to store and handle additions)

Method used

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  • Modified polytetrafluoroethylene (PTFE) and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: the preparation method of modified polytetrafluoroethylene and its application:

[0029] In the preparation process of the modified polytetrafluoroethylene of the present invention, equipment such as a 15-liter reaction kettle, a magnetic stirrer, and a heating device are required. The set reaction conditions are: temperature 60° C., stirring speed 120 revolutions per minute.

[0030]Preparation of SAN and MMA copolymer: add 95 grams of silicone oil, 4 grams of chelating agent ethylenediaminetetraacetic acid i.e. EDTA and 1 gram of chain transfer agent hypophosphite sodium salt in the reaction kettle and mix as electrolyte mother liquor; Contains 0.25 g Fe 2+ / CHP (cumyl hydroperoxide) as the initiator, 18 grams of styrene and acrylonitrile mixed monomer and 60 ml of polytetrafluoroethylene emulsion are added to the reaction kettle, the temperature is raised to 60 ° C, and the polymerization reaction is stirred at this temperature After 8 hours, centrif...

Embodiment 2

[0032] Embodiment 2: the preparation method of modified polytetrafluoroethylene and its application:

[0033] The preparation of SAN copolymer: in reactor, add 95 grams of silicone oils, 4 grams of chelating agent ethylenediaminetetraacetic acid namely EDTA and 1 gram of chain transfer agent sodium dihydrate methyl sulfite (SFS) mix as electrolyte mother liquor; Then in the situation of stirring will contain 0.25 g Fe 2+ / CHP (cumene hydroperoxide) as the initiator, 18 grams of styrene and acrylonitrile mixed monomer and 55 ml of polytetrafluoroethylene emulsion are added to the reaction kettle, the temperature is raised to 65 ° C, and the polymerization reaction is stirred at this temperature 2 hours. Then raise the temperature to 95°C and stir the slurry with a stirring bar for 20 minutes, and then centrifugally filter the obtained powder. The powder is heated at 55°C for 30 minutes and then becomes a paste again. The solid content of the paste is It was 18%, and the powd...

Embodiment 3

[0035] Embodiment 3: the preparation method of modified polytetrafluoroethylene and its application:

[0036] The production process was the same as in Example 2, except that the initiator was changed to 1.5 g of ethylene propyl dicarbonate, and the product was washed with water, centrifugally dehydrated, and dried to obtain 143.6 g of modified polytetrafluoroethylene. The polytetrafluoroethylene content is 46.8%.

[0037] Use the above-mentioned anti-dripping agent 0.3%-5%, PBT95% and 4%-5% RDP in a twin-screw extruder for high-speed mixing and extruding to pelletize, and inject the pellets into a modified resin of 127x12x16mm (1 / 16) , Determination of flame retardant performance according to UL94 flame retardant classification requirements. The results show that in the modified mixed resin, the surface of the injection product is flat and smooth, and the flame retardancy level is V0 when burning, and there is no melt dripping phenomenon.

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Abstract

The invention relates to a modified polytetrafluoroethylene (PTFE) and a preparation method and an application thereof. All or parts of the PTFE particles are prepared by being coated with polymer or copolymer by an emulsion polymerization method and the weight percent of polymer or copolymer is 40%-60% of the modified PTFE. The preparation method comprises the following steps: adding electrolytemother solution in a reaction kettle; adding mixed monomers of styrene and acrylonitrile with initiator and PTFE emulsion in the reaction kettle while stirring, heating the mixture to 60-65 DEG C to perform polymerization reaction for 2-8h while stirring, then adding crylic acid monomer which accounts for 5% of the weight of the obtained polymer, heating the mixture to 60-70 DEG C for 40-60min toform new copolymer, centrifuging and filtrating the copolymer, drying until the moisture content is smaller than 0.5% and obtaining the desired product; wherein, the solid content of PTFE emulsion is40-70%, the particle size is 0.05mu m-20mu m, and the weight ratio of the electrolyte mother solution, initiator, mixed monomers of styrene and acrylonitrile and the PTFE emulsion is 4:(0.1-4):(30-45):(50-70). The modified PTFE can be used in anti-dripping agent and the like. The modified PTFE prepared by the invention has convenient storage, good dispersity, and controllable additive amount.

Description

technical field [0001] The invention relates to a modified polytetrafluoroethylene and its preparation method and application. Background technique [0002] Because most thermoplastics have strong corrosion resistance, do not react with acid and alkali, low manufacturing cost, durable, waterproof, light weight, easy to be molded into different shapes, multi-functional, easy to color, some high temperature resistant, and good Insulators are increasingly widely used. However, the molecules of thermoplastic resins have a linear or chain-shaped structure, which softens when heated, and is in a molten state when it reaches a certain temperature, and even burns and drips. The fires caused by the ignition of high polymers are also greatly increased. Therefore, the importance of flame retardants and flame retardant materials is beyond doubt. [0003] However, simply adding flame retardants will not have the effect of anti-dripping. The softening and dripping of thermoplastic mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/18C08L25/12C08L25/14C08L55/02C08F2/22
Inventor 石建勋
Owner SHANGHAI ENTROPY CHEM
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