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常州轩豪机械有限公司专业生产液压油缸及柱塞产品实现产品产销一体化
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How to use rubber in hydraulic cylinder?

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Rubber is the basic raw material of rubber industry, widely used in the manufacture of tires, rubber hose, adhesive tape, cable and other rubber products. Classification of image:

1 according to raw materials into natural rubber and synthetic rubber.

2 according to the form is divided into block rubber, liquid rubber, latex and rubber powder.

Colloidal dispersions of latex for rubber;

Liquid rubber for the rubber of the oligomer, the general is not before the sulfide viscous liquid;

3 by using the common and special type.Powder rubber is the latex into powder form, in order to facilitate the ingredients and processing.

The comprehensive performance of general type rubber is good, and its application is wide. Mainly: natural rubber. ISO - e rubber, also known as synthetic natural rubber. Styrene butadiene rubber, referred to as SBR. The butadiene rubber, referred to as BR.

Special type rubber, which has certain special properties. Mainly:

CR, referred to.

Prepared by polymerization of chloroprene. Has good comprehensive performance, oil resistance, flame resistance, oxidation resistance and ozone resistance. But its density is bigger, the hydraulic cylinder is easy to crystallize in the normal temperature, the storage is not good, the cold resistance is bad.

The nitrile rubber, referred to as NBR.

Copolymerization of butadiene and acrylonitrile. With good oil resistance, heat resistance, cold resistance, pressure resistance and water resistance, air tightness and excellent bonding properties and has suitable wear resistance, usually the use of temperature is approximately - 40 DEG C to 120 DEG C, in 120 DEG C in air or in 150 DEG C oil in use for a long time.

Easy to use metal mold into any shape of the hydraulic seal, so the rubber is the most suitable for the production of the work pressure is not greater than 32Mpa of the hydraulic cylinder seal. Specially designed formula, easy to press the hair oil: wear resistance can withstand mechanical automobile axis rotate speed 3000 rpm / when the following (at this time the rubber hardness is 70 degrees).

Silicone rubber. SILICONE

The main chain is composed of a silicon oxygen atom, which has an organic group in the silicon atom. High and low temperature resistance, ozone resistance, good electrical insulation. Use temperature of - 40 DEG C +220 DEG C; oil resistance in high temperature, abrasion resistance, oil resistance! Especially suitable for the automotive engine crankshaft oil seal is not easy to heat volatile oil (diesel, gasoline) wear resistance, oxygen, ozone, and sunlight (UV).

The fluorine rubber. Viton

Synthetic rubber containing fluorine atoms in the sub structure. It is usually expressed as the number of fluorine atoms in the copolymer, such as fluorine rubber 23, which is a copolymer of two vinyl chloride with three fluoride. High temperature, oil resistance, chemical corrosion resistance of fluorine rubber. Oil resistance, high temperature resistance, chemical resistance, but also has the characteristics of acid and alkali resistance. Using temperature, 30 +280. Applied to the injection engine crankshaft oil seal, oil seal, is also used in the O type ring and sealing ring

The polysulfide rubber.

By sulfide polycondensation two halogenated and alkali metal or alkaline earth metal and. Have excellent resistance to oil and solvent resistance, hydraulic cylinder but the intensity is not high, anti-aging, processing is not good, smell, and acrylonitrile butadiene rubber.

In addition, polyurethane rubber, chlorinated rubber, acrylic rubber, etc..

Polyurethane rubber

One of the highest tensile strength of synthetic rubber, it has excellent oil resistance, heat resistance, cold resistance, pressure resistance and wear resistance, the use of the temperature is 40 C ~ + 80, polyurethane rubber sealing performance is superior, it is particularly suitable for the production of pressure, high pressure and ultra high pressure hydraulic cylinder seal.

Properties of silica gel

It is divided into silochrom and kiselgel

Silica gel can absorb moisture, but also can absorb acetylene and carbon dioxide. With the decrease of temperature, the first adsorption is water (at room temperature, about 25), followed by acetylene and carbon dioxide (the lower the temperature, the stronger the adsorption capacity).

Taking the water as an example, the dynamic adsorption capacity of /mm4 ~ 8 /%6 ~ 8 ~ -52 and /g 0.03 after dry air was M-3

Regeneration temperature / 140 ~ 160

The adsorption capacity of silica gel on the water is large, the regeneration temperature is low, the price is cheap, so the air separation device is mainly used for the adsorption of water, at low temperature, it is also used to absorb carbon dioxide and acetylene. Its disadvantages are more powder.

Silica gel has coarse pore and pore two, two different aperture. The diameter of the hole is 5 ~ 10nm (, 1nm=10-9m), and the specific surface area of silica gel is 100 ~ 300m2/g. It has a strong water absorption capacity, and is not easy to break after water absorption, good mechanical strength, commonly used in the dryer to absorb moisture. Kiselgel aperture is 2.5 ~ 4nm, the specific surface area was 400 ~ 600m2/g. Commonly used to absorb carbon dioxide and acetylene, adsorption of water easily broken. Carbon dioxide adsorber adsorption process is at - 110 to 120 degrees Celsius temperature of, carbon dioxide adsorption effect better, but also adsorbed acetylene. Because temperature is lower than 130 DEG C below will have solid carbon dioxide precipitation and solid carbon dioxide can be adsorbed by silica gel, and will plug the adsorber. The adsorption of acetylene is carried out in liquid air, liquid oxygen adsorber, the adsorption temperature at -170 ~ -180 degrees celsius.

The basic structural unit of silicone products is made of silicon - oxygen chains constitute, side chain is through the silicon atoms and a variety of other organic groups are connected. Therefore, in the structure of silicone products contain both "organic groups", but also contains the "inorganic structure", this particular composition and molecular structure of the organic matter and the characteristics of organic matter and the function of a body. Compared with other polymer materials, the most outstanding performance of silicone products is:

1 heat resistance

Silicone product is the silicon oxygen bond (SiO) as the main chain structure, C-C bond is 82600 kcal / mole, SiO key