When the temperature rises, the basic properties of the heat shrinkable tube insulating material, such as resistance, electric shock wear strength, mechanical strength, etc., will become smaller, media loss, stress deformation, etc., are going to increase. Therefore, it is of great practical value to improve the heat resistance of insulating materials:
(1) To ensure the safe operation of motors and electrical appliances, reduce maintenance and 0, replacement of components;
(2) without changing the size of the motor, electrical appliances, can improve its insulation grade and power, or in the maintenance of the original motor, electrical dimensions, can reduce the amount of insulating materials, thus reducing manufacturing costs and weight reduction;
(3) in the substation, coal mine, petroleum, chemical and other departments of electrical equipment, the use of high heat-resistant insulation materials, can receive explosion-proof, fireproof good results.
Some of the names used to denote the heat resistance of insulating materials and their meanings are as follows:
1. Insulation Thermal aging (high temperature resistant FEP heat shrinkable tube)
Slow or dramatic chemical changes (deterioration) of insulating materials or insulators, called thermal aging, occur during a short period of time or under high temperature for a long term. such as the formation of oxides in transformer oil, the hardening of lacquer film, brittleness and cracks, etc., are the manifestations of thermal aging.
In addition to temperature, the factors that accelerate thermal aging, as well as ozone, daylight irradiation, electric field, mechanical load and so on.
2. Thermal conductivity
It represents the heat transfer performance of the dielectric (insulator), that is, in the 1 cm apart, the temperature difference is 1 0C of the Material cross section (] cm ') wheel upward, in 1 seconds of heat conduction, its unit is card/cm, SEC ·0c0
3. Heat resistance (high temperature heat shrinkable tube)
It indicates the ability of materials to withstand high temperatures, that is, the ability of insulating materials to change dielectric, mechanical, physicochemical and other properties under short-term or long-term thermal action.
The maximum use temperature of the insulating material depends on this performance. The use of high heat resistance insulation materials, can enable motors, electrical appliances in the specified capacity (output) range, reduce the size, reduce weight and reduce manufacturing and maintenance costs.
4. Martin's Heat resistance
It represents the standard specimen of the material, at an hourly temperature of 50 ℃ (i.e. Martin's heat-resistant tester), bearing a bending torque load of 50 kg/cm ² and reaching the temperature of bending deformation, that is, Martin's heat resistance index.
5. Thermal stability (high temperature insulated heat shrinkable tube)
It indicates that the material does not change physicochemical, mechanical, dielectric properties and can maintain its ability to work when the temperature is repeated (ups and downs).
For insulating coatings, it refers to the performance without changing the appearance color, non-delamination, peeling and cracking at specified temperature and duration.
6. Thermal elasticity
It indicates that the material can maintain its flexible state performance for a long time under the action of high temperature.
The difference between thermal elasticity and thermal stability is that the former indicates the life of the material under dynamic, determined by the flexural strength; the latter indicates the stability of the material under static action, determined by the size of the weight loss.
High thermal elasticity, is an excellent new insulating material on one of the signs.
7. Weight Loss
It indicates the amount of weight lost by the material after a certain period of time at a specified temperature. For different materials, each has a limit value. If the limit value is exceeded, it indicates that there is too much volatile in the material, or there is pyrolysis, aging and co-chemical changes, in severe time, the material can not be used.
In practice, the comparative value of weight loss of two (or child) materials is often used as the basis for the thermal stability of methylenetin materials to be high or lower than that of B materials.
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