A high-temperature-resistant and anti-corrosion electric heating belt coating and its coating method

Abstract

The invention discloses a high temperature-resistant anticorrosion ribbon heater coating and a coating method thereof. The coating comprises, by weight, 100 to 135 parts of glue, 25 to 27 parts of modified phenolic resin, 35 to 38 parts of sodium silicate, 20 to 35 parts of a modified inorganic filler, 5 to 10 parts of nano-silicon carbide, 5 to 10 parts of nano-boron nitride and 10-15 parts of silicon dioxide. The coating method of the ribbon heater coating comprises putting the coating into a spray gun pot, carrying out repeated spray-coating on a ribbon heater to obtain multiple coating layers, and curing the coating layers at 200 DEG C for 24-48h. The coating method utilizes a spray gun-based coating method. Compared with the existing artificial brush coating method, the method improves coating uniformity. The coating has a good bonding force at a high temperature, does not fall off, has good electrical insulation properties at a high temperature, prevents breakdown under 1000V in 1h, has good thermal conductivity and a thermal conductivity rate of 20 w / m.k and realizes a low cost.

Description

technical field [0001] The invention relates to the technical field of electric heating belts, in particular to a high-temperature-resistant and anti-corrosion electric heating belt coating and a coating method thereof. Background technique [0002] Electric heating belt is a heating element of self-limiting temperature heating belt. It is a core belt made of semiconductor PTC material with a positive temperature coefficient that is evenly extruded between two parallel metal busbars. It can be widely used in storage and transportation of oil, Insulation, heat tracing, heating, etc. of pipe tanks, pumps, valves, instruments, tanks, houses, geothermal heat, etc. for water, gas and other media. [0003] Electric heating belts are generally divided into parallel type and series type according to the structure, and self-limiting type and constant power type according to the calorific value. The wire core of the self-limiting electric heating belt is a very complex high molecular...

AI Technical Summary

Problems solved by technology

[0004] During the use of electric heating belts, accidents caused by high temperature and fire are the biggest safety hazards. The reasons include the following aspects: due to excessive use time, environmental debris pollution, high temperature for a long time, or exposure to moisture and corrosion , the insulation is aging and deteriorated and loses its insulation capacity, causing a short circuit to catch fire; or the electric heating belt is exposed outdoors, and due to overvoltage such as lightning strikes, the insulation of the electric heating belt may be broken down to form an instantaneous short circuit; Current but stronger heating effect than short circuit current, causing fire or even explosion etc.

In order to prevent the heating cable from being oxidized and burned at high temperature, a layer of glue is generally applied to the end of the existing heating belt, but there are the following disadvantages: it cannot be sprayed, only brushed; the bonding force is not good at high temperature; heat conduction at high temperature Poor performance; poor electrical insulation; high cost