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Spherical polytetrafluoroethylene micro-powder wax and preparation method thereof

A polytetrafluoroethylene micropowder and polytetrafluoroethylene technology are applied in the field of spherical polytetrafluoroethylene micropowder wax and its preparation to achieve the effects of improving conversion rate, reducing damage, and being beneficial to chemical modification

Active Publication Date: 2021-07-02
江苏天问新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention aims to solve the problem of generating a large number of free fluoride ion radicals during the irradiation process, and reduce the damage to the microscopic morphology of the micropowder, thereby facilitating the subsequent chemical modification to obtain a fluoride ion free radical. Regular spherical micropowder

Method used

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  • Spherical polytetrafluoroethylene micro-powder wax and preparation method thereof
  • Spherical polytetrafluoroethylene micro-powder wax and preparation method thereof
  • Spherical polytetrafluoroethylene micro-powder wax and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 1) Stir 1000g of PTFE resin and 20g of KH560 evenly, place it in an irradiation box, and irradiate it with high-energy electron beams, and the irradiation dose is 20Mrad;

[0032] 2) Pulverize the irradiated product with a jet mill, then disperse it in acetone, add acetic acid to stir, leave it to stand for stratification, and filter to obtain polytetrafluoroethylene micropowder;

[0033] 3) Disperse 100g of the treated polytetrafluoroethylene micropowder in 500ml of ethylene glycol, add 5g of polyvinylpyrrolidone and ultrasonically disperse it evenly, react with water at 140°C for 5h, wash and dry after treatment to obtain carboxyl-terminated polytetrafluoroethylene micropowder ;

[0034] 4) Add 100g of carboxyl-terminated polytetrafluoroethylene micropowder and 10g of hydroxyethyl methacrylate into the reaction flask, add 500ml of solvent DMF, and disperse it evenly by ultrasonication, then add 2g of dimethylimidazole, and react at 150°C for 8h. Filter and dry after ...

Embodiment 2

[0037] Step 1) Stir 1000g PTFE resin with 40g KH570 evenly, place it in an irradiation box, and use high-energy electron beams to irradiate, and the irradiation dose is 50Mrad;

[0038] 2) Pulverize the irradiated product with a jet mill, then disperse it in acetone, add acetic acid to stir, leave it to stand for stratification, and filter to obtain polytetrafluoroethylene micropowder;

[0039] 3) Disperse 100g of the treated polytetrafluoroethylene micropowder in 500ml of ethylene glycol, add 5g of polyvinylpyrrolidone and ultrasonically disperse it evenly, react with water at 140°C for 5h, wash and dry after treatment to obtain carboxyl-terminated polytetrafluoroethylene micropowder ;

[0040] 4) Add 100g of carboxyl-terminated polytetrafluoroethylene micropowder and 10g of hydroxyethyl methacrylate into the reaction flask, add 500ml of solvent DMF, and disperse it evenly by ultrasonication, then add 2g of dimethylimidazole, and react at 150°C for 8h. Filter and dry after c...

Embodiment 3

[0043] 1) Stir 1000g of PTFE resin and 60g of KH560 evenly, place it in an irradiation box, and irradiate it with high-energy electron beams, and the irradiation dose is 100Mrad;

[0044] 2) Pulverize the irradiated product with a jet mill, then disperse it in acetone, add acetic acid to stir, leave it to stand for stratification, and filter to obtain polytetrafluoroethylene micropowder;

[0045] 3) Disperse 100g of the treated polytetrafluoroethylene micropowder in 500ml of ethylene glycol, add 5g of polyvinylpyrrolidone and ultrasonically disperse it evenly, react with water at 140°C for 5h, wash and dry after treatment to obtain carboxyl-terminated polytetrafluoroethylene micropowder ;

[0046]4) Add 100g of carboxyl-terminated polytetrafluoroethylene micropowder and 10g of hydroxyethyl methacrylate into the reaction flask, add 500ml of solvent DMF, and disperse it evenly by ultrasonication, then add 2g of dimethylimidazole, and react at 150°C for 8h. Filter and dry after ...

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Abstract

The invention relates to spherical polytetrafluoroethylene micro-powder wax and a preparation method thereof, and the preparation method comprises the following steps: irradiating a polytetrafluoroethylene raw material and an organic siloxane adsorbent in an aerobic environment together, crushing to obtain polytetrafluoroethylene micro-powder, and then carrying out dispersion polymerization to obtain the spherical polytetrafluoroethylene micro-powder wax. In the preparation process, fluorine-containing gas generated in the irradiation process can be consumed, and the damage to the microstructure of the polytetrafluoroethylene micro powder is reduced; the conversion rate of carboxyl at the tail end of a polytetrafluoroethylene chain is increased, and the content of functional groups on the surface of the micro powder is increased, so that subsequent chemical modification is facilitated; the chain end of the polymer has activity and is easy to graft to obtain products with different properties, and active functional groups such as carboxyl and hydroxyl at the chain end of the polymer can be used for modification to form a comb-shaped polymer, so that the application range of the comb-shaped polymer is expanded; the shape of the polytetrafluoroethylene micro-powder is not greatly damaged, the polytetrafluoroethylene micro-powder is extremely easy to form a sphere during chemical modification, and the obtained micro powder is relatively small in particle size, uniform in size and good in dispersion performance.

Description

technical field [0001] The invention belongs to the technical field of polytetrafluoroethylene micropowder material preparation, in particular to a spherical polytetrafluoroethylene micropowder wax and a preparation method thereof. Background technique [0002] PTFE micropowder, also known as PTFE wax, is a white micropowder resin with a diameter of about 20 μm, because of its excellent heat resistance, weather resistance, low friction, non-stick and chemical stability and other excellent properties , It is widely used in plastics, lubricants, rubber, ink and other fields. [0003] At present, PTFE micropowder is usually prepared by irradiation method, and the particle shape is difficult to achieve a regular spherical shape, and during the irradiation process, complex free radical reactions will occur between high-energy rays and PTFE polymer molecular chains, resulting in a large amount of These gases are usually directly volatilized and discharged into the atmosphere duri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F259/08C08F220/06C08F220/20C08F220/22C08J3/28C08L27/18C08K5/5425C08K5/5435
CPCC08F259/08C08J3/28C08J2327/18C08K5/5425C08K5/5435C08F220/06C08F220/20C08F220/22
Inventor 张朝广王允常贺郑军夏文兄时新风
Owner 江苏天问新材料科技有限公司
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