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Insulation coating for electric heating pipe for electric water heater

A technology of insulating coating and electric heating tube, applied in the direction of coating, fireproof coating, etc., can solve the hidden danger of electric heating tube, reduce the insulation of heating tube, easy to yellow in color and other problems, so as to improve the density and improve the safety. properties, and the effect of improving processability and fluidity

Active Publication Date: 2018-08-31
安徽弘美电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The heating tube in the prior art includes a shell and a heating wire. The gap is filled and compacted with magnesia sand with good insulation and thermal conductivity. In order to improve the insulation performance of the heating tube, an insulating coating is usually provided outside the shell. The traditional After a period of use, the insulating coating tends to turn yellow in color, and then cracks appear, which affects the appearance and reduces the insulation of the heating tube, making the electric heating tube a potential safety hazard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] An insulating coating for an electric heating tube for an electric water heater, the insulating coating is composed of the following raw materials: 50 parts of polyimide resin, 20-30 parts of vinyl silicone oil, and epoxy silicone resin with a molecular weight of 4500-5700 10 parts, 0.5 parts of ethynyl cyclohexanol, 10 parts of toluene, 5 parts of ethylene-vinyl acetate copolymer, and 5 parts of polydimethylsiloxane with a molecular weight of 32500-37500.

[0016] The production method is as follows: Weigh each raw material according to the amount, crush and mix with mechanical ball milling method, and make mixed powder and send it to the powder feeder of thermal spraying system. The process parameters are: the gas flow rate of argon gas is 40-50L / min, the gas flow rate of nitrogen gas is 35-40L / min, the working current is 500-550A, and the working voltage is 70-85V.

Embodiment 2

[0018] Further, the insulating coating is composed of the following raw materials: 50 parts of polyimide resin, 24 parts of vinyl silicone oil, 12 parts of epoxy silicone resin with a molecular weight of 4500-5700, 0.6 parts of ethynyl cyclohexanol, toluene 12 parts, 6 parts of ethylene-vinyl acetate copolymer, 6 parts of polydimethylsiloxane with a molecular weight of 32500-37500.

[0019] The production method is as follows: Weigh each raw material according to the amount, crush and mix with mechanical ball milling method, and make mixed powder and send it to the powder feeder of thermal spraying system. The process parameters are: the gas flow rate of argon gas is 40-50L / min, the gas flow rate of nitrogen gas is 35-40L / min, the working current is 500-550A, and the working voltage is 70-85V.

Embodiment 3

[0021] Further, the insulating coating is composed of the following raw materials: 50 parts of polyimide resin, 26 parts of vinyl silicone oil, 14 parts of epoxy silicone resin with a molecular weight of 4500-5700, 0.8 parts of ethynyl cyclohexanol, 14 parts of toluene Parts, 7 parts of ethylene-vinyl acetate copolymer, 8 parts of polydimethylsiloxane with a molecular weight of 32500-37500.

[0022] Its production method is as follows: Weigh each raw material according to the amount, crush and mix with mechanical ball milling method, and make mixed powder and send it to the powder feeder of thermal spraying system. The process parameters are: the gas flow rate of argon gas is 40-50L / min, the gas flow rate of nitrogen gas is 35-40L / min, the working current is 500-550A, and the working voltage is 70-85V.

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PUM

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Abstract

The invention relates to the technical field of insulating coating production, in particular to an insulating coating of an electric heating tube for an electric water heater. The insulating coating is prepared from 50 parts of polyimide resin, 20-30 parts of vinyl silicone oil, 10-15 parts of epoxy organic silicon resin, 0.5-1 part of 1-ethynyl-1-cyclohexanol, 10-15 parts of methylbenzene, 5-8 parts of an ethylene-ethenyl ethanoate copolymer and 5-10 parts of polydimethylsiloxane. A production method of the insulating coating comprises the steps that all the raw materials are weighed according to the quantity, crushed through a mechanical ball milling method, mixed and prepared into mixed powder, and the mixed powder is fed into a powder feeder of a thermal spraying system and sprayed on the workpiece surface by adopting a plasma spraying technology. The insulating coating has the comprehensive effects of being outstanding in high temperature resistance and flame retardance, good in insulativity and the like.

Description

technical field [0001] The invention relates to the technical field of insulating coating production, in particular to an insulating coating of an electric heating pipe for an electric water heater. Background technique [0002] Electric water heaters Water heaters that use electricity as energy for heating are generally called electric water heaters. The power of an electric water heater is generally 900-7500W. The heating tube is the key component of the electric water heater. The electric heating tube is made of a metal tube as the shell, and the spiral electric heating alloy wire (nickel-chromium, iron-chromium alloy) is evenly distributed along the central axis of the tube, and the gap is filled and compacted with magnesia sand with good insulation and thermal conductivity. Silicone or ceramic seal. [0003] The heating tube in the prior art includes a shell and a heating wire. The gap is filled and compacted with magnesia sand with good insulation and thermal conduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D179/08C09D183/07C09D183/04C09D123/08C09D5/25C09D5/18C09D7/63
CPCC08L2201/02C08L2201/08C08L2205/025C08L2205/035C09D5/18C09D7/63C09D179/08C08L83/04C08L23/0853C08K5/05
Inventor 汪洋李国春陈启志刘萍萍
Owner 安徽弘美电器有限公司