Electromagnetic valve sealing material

2016-06-08

Solenoid valve sealing material is currently the three most commonly used.


NBR butyl rubber (butadiene rubber nitrile)
From butadiene and acrylonitrile by emulsion polymerization method of, nitrile rubber mainly uses the low-temperature emulsion polymerization production, excellent oil resistance, high wear resistance, heat resistance is good, strong adhesion. The disadvantage is that low temperature tolerance, poor resistance to ozone, poor electrical performance, low elasticity.
In addition, it also has good water resistance, air tightness and excellent bonding performance. Widely used in all kinds of oil resistant rubber products, a variety of resistant oil washers, gaskets, casing, flexible packaging, flexible hose, dyeing roller, plastic cable materials, in the automobile, aviation, petroleum, copying and other industry become essential for elastic materials.


Nitrile rubber has excellent oil resistance its oil resistance after polysulfide rubber and fluorine rubber, and with the wear resistance and air tightness. Ding Qing rubber drawback is not resistant to ozone and aromatic, halogenated hydrocarbon, ketone and ester solvents, insulation materials do not.


Main use
Nitrile rubber is mainly used for production of oil products, such as the oil pipe, tape, rubber diaphragm and large oil sac, etc., used in the production of various types of oil resistant molded products, such as O-ring, oil seal, a leather cup, diaphragm, valve, bellow, and can also be used to make blankets and wear parts.


EPDM three EPDM (Ethylene-Propylene-Diene Monomer)
Three EPDM is ethylene, propylene and non conjugated diene copolymer three yuan, began commercial production in 1963. The consumption of the world is 800 thousand tons per year. The most important characteristic of EPDM is its superior resistance to oxidation, ozone resistance and resistance to corrosion. Because the three EPDM belongs to the family of polyolefin, it has excellent curing characteristics. Among all the rubber, EPDM has the lowest specific gravity. It can absorb a large amount of filler and oil and has little effect. So the rubber compound with low cost can be produced.


The molecular structure and characteristics: three yuan three yuan is the copolymer of ethylene, propylene and non conjugated diene. It has a special structure, only one of the two keys to copolymerization, unsaturated double bond is mainly used as the chain. Another unsaturated polymer chain will not become a side chain. The main polymer chain three yuan is fully saturated. This characteristic makes three yuan can resist heat, light, oxygen, especially ozone. Ternary ethylene propylene, in essence, is non-polar and resistant to polar solvents and chemicals, bibulous rate is low, has good insulating properties.


characteristic
1, low density and high filling;
2, resistance to aging;
3, corrosion resistance;
4, water vapor resistance;
5, resistant to hot water performance;
6, electrical properties;
7, flexibility;
8, adhesion.


VITON fluorine rubber (FKM)
Molecules containing fluorine rubber, according to fluoride content in the monomer structure and various types; hexafluoride fluorine rubber resistant high temperature is better than that of silicone rubber, chemical resistance, resistance to most of the oil and solvent (with the exception of the ketones, esters), weather resistance, ozone resistance are good, but cold resistance is poor, has been widely used for cars and motorcycles, and second-class goods, chemical plant in the seal, the use temperature range of - 20 DEG C to 260 DEG C, chilling requirements using a resistant to low temperature can be used to apply to - 40 DEG C, but the price is higher.

 

Solenoid valve manufacturer:Ningbo Lida Pneumatic Complete Sets Co.,Ltd.