Water-based polytetrafluoroethylene heat-gathering-preventing magnetic-conducting non-stick coating and preparation method thereof

A polytetrafluoroethylene, non-stick coating technology, applied in the direction of magnetic coatings, coatings, etc., can solve the problems of non-stick coating not having magnetic conductivity, affecting the effect of electromagnetic heating, uneconomical, etc., and achieving excellent non-stick performance. , The effect of improving uniform dispersion and high electromagnetic heating efficiency

Active Publication Date: 2022-05-17
HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the thermal conductivity of the coating is generally increased by doping a large amount of substances with high thermal conductivity or infrared radiation characteristics in the main resin, but since the thermal conductivity of polytetrafluoroethylene, the main film-forming substance in water-based non-stick coatings, is 0.25W / mK, compared to the thermal conductivity of common non-stick cookware base material aluminum, which is 138-147W / mK, polytetrafluoroethylene is approximately non-conductive, so it is not economical to use the above two methods to improve heat transfer
In addition, since the non-stick coating does not have magnetic properties, it will affect the electromagnetic heating effect of iron cookware on the induction cooker

Method used

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  • Water-based polytetrafluoroethylene heat-gathering-preventing magnetic-conducting non-stick coating and preparation method thereof
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preparation example Construction

[0033] A preparation method of water-based polytetrafluoroethylene polytetrafluoroethylene anti-polymerization heat-conducting magnetic non-stick coating, comprising the following steps:

[0034] 1) Preparation of organically modified magnetically conductive particles: Disperse the magnetically conductive particles in a total amount of 40-60% of water through a pre-dispersion process (ultrasonic or grinding or a combination thereof) to form a slurry of magnetically conductive particles, then add silane coupling Combined agent, stir (200-500rpm) at room temperature for 3-5h and then filter, add a total of 40-60% tetraethyl orthosilicate, heat up to 50-85°C, stir (200-500rpm) after heating After 2-4 hours, the organically modified magnetic permeable particles are obtained after separation.

[0035] 2) Preparation of water-based polytetrafluoroethylene anti-polythermal, magnetically conductive and non-stick coating: adding the organically modified magnetically conductive particle...

Embodiment 1

[0037] 1) Preparation of organically modified magnetic conductive particles:

[0038] Disperse 20 parts of silver powder of magnetically conductive particles in 12 parts of water by ultrasonic process to form a slurry of magnetically conductive particles, add 4 parts of γ-(2,3-glycidyloxy)propyltrimethoxysilane, at room temperature 200rpm After stirring and reacting for 5 hours, filter, add a total of 1.2 parts of tetraethyl orthosilicate, raise the temperature to 50° C., stir and react at 200 rpm for 4 hours after heating, and obtain organically modified magnetically conductive particles.

[0039] 2) Preparation of water-based polytetrafluoroethylene anti-polymerization thermal conductivity and magnetic non-stick coating:

[0040] Add the organically modified magnetically conductive particles prepared in step 1) to a mixture of 60 parts of 60wt% polytetrafluoroethylene emulsion and 1.8 parts of tetraethyl orthosilicate, raise the temperature to 50°C, and stir at 200rpm for 4 ...

Embodiment 2

[0043] 1) Preparation of organically modified magnetic conductive particles:

[0044] Disperse 9 parts of magnetically conductive particle iron powder and 1 part of holmium oxide powder in 4 parts of water by grinding process to form a slurry of magnetically conductive particles, add 2 parts of γ-methacryloxypropyl trimethoxysilane, Stir and react at 500 rpm at room temperature for 3 hours, then filter, add a total of 0.6 parts of tetraethyl orthosilicate, heat up to 85°C, and stir and react at 500 rpm for 2 hours after heating to obtain organically modified magnetic permeable particles.

[0045] 2) Preparation of water-based polytetrafluoroethylene anti-polymerization thermal conductivity and magnetic non-stick coating:

[0046] Add the organically modified magnetically conductive particles prepared in step 1) to a mixture of 20 parts of 60wt% polytetrafluoroethylene emulsion and 0.4 parts of tetraethyl orthosilicate, raise the temperature to 85°C, and stir at 500rpm for 2 ho...

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Abstract

The invention relates to the field of high polymer materials, and discloses a water-based polytetrafluoroethylene heat-gathering-preventing magnetic-conducting non-stick coating and a preparation method thereof. The non-stick coating is prepared from 20 to 60 parts of polytetrafluoroethylene emulsion, 10 to 30 parts of fluorine-containing emulsion, 10 to 30 parts of bonding resin, 10 to 20 parts of magnetic conductive particles, 2 to 4 parts of silane coupling agent, 1 to 3 parts of tetraethyl orthosilicate, 20 to 40 parts of high-temperature-resistant pigment, 20 to 40 parts of high-temperature-resistant filler, 1 to 3 parts of additive and 10 to 20 parts of water. According to the preparation method, the organic modified magnetic conductive particles are firstly prepared and then react with the polytetrafluoroethylene emulsion and the tetraethyl orthosilicate to form an organic-inorganic interpenetrating network structure, and finally other raw materials are added to prepare the water-based polytetrafluoroethylene magnetic conductive non-stick coating. And the problem of heat accumulation of the non-stick coating of the iron cooker can be solved.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a water-based polytetrafluoroethylene polytetrafluoroethylene anti-polymerization heat-conducting and magnetic-conducting non-stick coating and a preparation method thereof. Background technique [0002] Iron cookware is the mainstream in the domestic cookware market, and this situation will continue for a long time in the foreseeable future. In addition to the advantages of easy-to-obtain raw materials and low cost, iron cookware can also enable iron pans to be used in induction cookers without any auxiliary accessories, which is impossible for aluminum pans, and the heating effect is better than that of aluminum-steel cookware. Composite. In addition, iron materials have excellent performances such as heat accumulation, heat preservation, and heat resistance. Most foods cooked in iron pans have significantly better taste and freshness than aluminum pans. Iron substrates are al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D127/18C09D181/06C09D123/08C09D181/02C09D5/23C09D7/63C09D7/61C09D7/20
CPCC09D127/18C09D5/23C09D7/63C09D7/61C09D7/20C08K2003/0806C08K2003/2272C08L27/18C08L81/06C08L81/02C08K3/22C08K3/34C08K9/06C08K3/08C08K5/5415Y02P20/10
Inventor 刘海龙钱涛
Owner HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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