Non-stick coating and method for its preparation, as well as pots and cooking equipment

A non-stick coating and powder technology, which is applied in coatings, metal material coating technology, kitchen utensils, etc., can solve the problems of low coating hardness, non-stickiness, and low coating adhesion

Active Publication Date: 2021-11-19
FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, non-stick coatings are used in electric rice cookers and electric pressure cooker liners to realize the easy-cleaning function of pots. The existing non-stick coatings are generally organic fluorine resins (such as PTFE non-stick coatings) or inorganic ceramic non-stick coatings. Most of the existing fluororesin and ceramic non-stick coatings are formed by air pressure spraying, electrostatic spraying and then high temperature sintering and solidification, and the service life of this kind of coating is generally only half a year to one year, and the coating hardness is low ( The Vickers hardness of PTFE non-stick coating is 100-200HV, the Vickers hardness of ceramic non-stick coating is 200-350HV), and the coating adhesion is small (the bonding force of PTFE non-stick coating is 2-10MPa, ceramic non-stick coating The bonding force of the sticky coating is 2-5MPa), the coating thickness is small (the thickness of the PTFE non-stick coating is 20-50μm, the thickness of the ceramic non-stick coating is 20-40μm), acid and alkali resistance and salt resistance Also generally, scratches, abrasions, and corrosion will inevitably cause the coating to fall off and fail during long-term use. After the surface coating fails, this non-stick coating will not have non-stick properties, which will affect the coating. Life and application have caused a great degree of limitation

Method used

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  • Non-stick coating and method for its preparation, as well as pots and cooking equipment
  • Non-stick coating and method for its preparation, as well as pots and cooking equipment
  • Non-stick coating and method for its preparation, as well as pots and cooking equipment

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0081] (1) 47.6kg of common PFA powder, 0.4kg of polyvinyl alcohol, 2kg of glycerin and 50kg of water are mixed to prepare a slurry;

[0082] (2) The slurry is subjected to airflow atomization drying treatment, wherein the conditions of airflow atomization drying include: the atomization pressure is 0.4MPa, and the atomization air flow rate is 2m 3 / h, the inlet temperature is 320°C, and the outlet temperature is 100°C to obtain modified PFA powder S1.

[0083] It is determined that the particle size D50 of the modified PFA powder is 52 μm, the sphericity of 96% of the powder is 95%, the fluidity is 15s / 50g, and the purity is 99.9%. The microscopic morphology of the modified PFA powder is shown in figure 1 shown.

preparation example 2

[0085] (1) 54.8kg common PFA powder, 0.2kg polyvinyl chloride, 3kg paraffin and 42kg water are mixed to prepare slurry;

[0086] (2) The slurry is subjected to airflow atomization drying treatment, wherein the conditions of airflow atomization drying include: the atomization pressure is 0.3MPa, and the atomization air flow rate is 1m 3 / h, the inlet temperature is 300°C, and the outlet temperature is 60°C to obtain modified PFA powder S2.

[0087] It is determined that the particle size D50 of the modified PFA powder is 46 μm, the sphericity of 95% of the powder is 93%, the fluidity is 13s / 50g, and the purity is 99.5%.

preparation example 3

[0089] (1) 38.5kg common PFA powder, 0.5kg polyacrylate, 1kg graphite and 60kg water are mixed to prepare slurry;

[0090] (2) The slurry is subjected to airflow atomization drying treatment, wherein the conditions of airflow atomization drying include: the atomization pressure is 0.5MPa, and the atomization air flow rate is 3m 3 / h, the inlet temperature is 350°C, and the air outlet temperature is 140°C to obtain modified PFA powder S3.

[0091] It is determined that the particle size D50 of the modified PFA powder is 59 μm, the sphericity of 95% of the powder is 98%, the fluidity is 18s / 50g, and the purity is 99.9%.

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Abstract

The invention relates to the technical field of electric heating appliances, and discloses a non-stick coating, a preparation method thereof, pots and cooking equipment. The method comprises: (1) pretreating the substrate; (2) preheating the surface of the substrate obtained in step (1); (3) mixing metal oxide powder and fluororesin powder to obtain a powder mixture, and The powder mixture is thermally sprayed to form a non-stick coating on the surface of the substrate, and the metal oxide powder includes aluminum oxide powder and tetravalent metal oxide ceramic powder. The non-stick coating of the invention has the advantages of high surface hardness, high coating binding force, good scratch resistance, good corrosion resistance, good wettability, long service life and the like.

Description

technical field [0001] The invention relates to the technical field of electric heating appliances, in particular to a non-stick coating, a preparation method thereof, pots and cooking equipment. Background technique [0002] At present, non-stick coatings are used in rice cookers and electric pressure cooker liners to realize the easy-cleaning function of pots. The existing non-stick coatings are generally organic fluorine resins (such as PTFE non-stick coatings) or inorganic ceramic non-stick coatings. Most of the existing fluororesin and ceramic non-stick coatings are sprayed by air pressure, electrostatic sprayed and then sintered and solidified at high temperature. However, the service life of this kind of coating is generally only half a year to one year, and the coating hardness is low ( The Vickers hardness of PTFE non-stick coating is 100-200HV, the Vickers hardness of ceramic non-stick coating is 200-350HV), and the coating adhesion is small (the bonding force of P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/11C23C4/04A47J27/00A47J27/086A47J36/02A47J37/08
CPCA47J27/00A47J27/086A47J36/025A47J37/08C23C4/04C23C4/11C23C4/134
Inventor 李兴航曹达华黄宇华屈雪平李康李洪伟杨玲
Owner FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD
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