Performance in detail - What are the special performance silicone key materials
it is said that the development of silicone buttons will be early, and development of silicone rubber materials earlier and earlier global organic silicone materials research belongs to dimethyl silicone rubber, in the 1940 s American company DowCorning and GeneralElectric two communist in production, research and development of our country in the early 1960 years later, until now the world thousands of brands and models of silicone rubber material gradually born and put to use!
'silicone buttons' was a product of a silicone rubber products, more traditional in the key of silicone rubber material has indeed done more for a long time, once in the nineties, China dongguan factory production silicone buttons are all the rage, many factories long-term production and processing silicone remote control buttons, and material properties of the silicone buttons from that time had had a variety of certification testing and performance testing, show the properties and advantages of the following aspects:
silicone rubber products both inorganic and organic silicon polymer elastomer material, side chain is connected to the silicon atoms of hydrogen or replace hydrocarbon organic groups, the groups can be a methyl, unsaturated vinyl ( The mole fraction is generally not more than 01005) Or other organic groups, the molecular structure of low unsaturation make silicone rubber has excellent thermal aging and weathering aging resistance, erosion resistance to ultraviolet ray and ozone. Molecular chain flexibility is big, weak interaction between molecular chains, these structure characteristics make rubber, soft and elastic, but poor physical properties.
silicone rubber advantage of key features:
( 1) Resistance to high and low temperature
in all rubber, silicone rubber widest (working temperature range - - - - - - 100～350℃） Or less. Properly with vinyl silicone rubber, for example, or low phenyl silicone rubber, after thousands of hours of 250 ℃ or 300 ℃ after hundreds of hours in the hot air aging can remain elastic; Low phenyl silicone rubber vulcanizates after 350 ℃ dozens of hours hot air aging can still keep elasticity and its glass transition temperature was minus At 140 ℃, the temperature in - on the silicone buttons 70 ~ 100 ℃ temperatures remain resilient. Now silicone rubber can be used for rocket nozzle wall heat coating, can the instantaneous thousands of degrees of high temperature.
( 2) Resistance to ozone aging, oxygen aging, light aging resistance and weather resistance, aging resistance, silicone electronic buttons in the free state in outdoor exposure after a few years, no significant change in performance.
( 3) Electric insulation performance
electrical insulating performance of silicone electronic buttons in be affected with damp be affected with damp, frequency or temperature changes smaller, combustion generated after silica are insulators. In addition, less carbon atoms in the molecular structure of silicone rubber, and need not carbon black as filler, so seldom happened during arc discharge charred, use very reliable in high-pressure situations. Its excellent corona resistance and arc resistance, corona resistance life 1000 times that of ptfe, arc resistant life is 20 times of fluorine rubber.
( 4) Special surface properties and physiological inert
the surface of the silicone rubber products can be smaller than most of the organic material, low hygroscopicity, soak in water for a long time the bibulous rate is only 1% or so, physical performance is not falling, mouldproof performance is good, with many materials not glue, can isolate the role. Silicone buttons completely tasteless, non-toxic, no bad effect to human body, and minor tissue reaction, with excellent physiological inertia and biological aging.
( 5) High permeability is
silicone compared with other high polymer materials, has good air permeability, at room temperature for nitrogen, oxygen and air through the quantity more than 30 ~ 40 times the NR; Permeability to gases selective, such as the carbon dioxide permeability is about five times of oxygen.
( 6) Biomedical properties
the characteristics of molecular structure of the silicone products to make it with excellent biomedical properties, the successful application of a large number of animal and human experiment proves this point.
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