High temperature vulcanization silicone rubber ( HTV) Structural characteristics and USES, problems that should pay attention to in production
high temperature vulcanization silicone rubber ( HTV)
2. 1 HTV structural features and USES
HTV silicone products is the most important category, methyl vinyl silicone rubber ( VMQ） Is the most main varieties of HTV.
methyl vinyl silicone rubber ( Raw rubber) Is a colorless, odorless, non-toxic, no mechanical impurities of jelly, raw rubber, according to the need to join the appropriate reinforcing agent, the structure control agent, vulcanizing agent and other additives mixed together, then heating to 140 ~ 180 ℃ high temperature molding or extrusion molding, then through secondary sulfide into various products.
the products with excellent electrical insulation, arc resistance, corona, edm capability is strong, waterproof, moistureproof, impact resistance, good shock resistance, with physiological inertia, permeability and other performance.
2. 2 running characteristic of HTV
high temperature vulcanization silicone rubber is mainly used in bar hanging pillar composite insulator, composite insulator, power stations and on the equipment with a hollow composite insulator. Run, because of the large amount of more also reflects the problem. Roughly as follows:
product pollution obviously, hydrophobic performance weakening
embrittlement, hardening, pulverization, cracking and breakage phenomenon of aging or damaged
umbrella skirt deformation serious, partial discharge traces, dendritic channels or pitting
in the running characteristics of silicone rubber, hydrophobic is one of the most important parameters, wu had run in order to study the hydrophobic properties of compound silicone rubber, to run the composite silicone rubber in the following test:
, hydrophobic test
low temperature simulation test,
, ash dense effect on hydrophobic
tracking and electrical erosion resistance test,
2. 4 HTV production, the problems need to pay attention to in the application of
aluminum powder is added in the HTV, in order to improve the resistance of HTV tracking parameters, is not the more the better. Such as too much, can appear HTV high hardness, hydrophobic, run soon appeared in the process of HTV hardening and pulverization degradation phenomenon.
should strictly control the formula, not to save costs in the HTV doping, reduce the operating parameters of the HTV ( Including electric performance parameters and mechanical properties) 。
, control the production process, to avoid defects, introduced in the molding process, appears in the operation of the electric erosion phenomenon, reduce the service life of HTV.
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