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Characteristics of rubber and silica raw materials

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Characteristics of rubber and silica raw materials

Release date:2016-07-27 Author: Click:

What is rubber, the basic raw material of rubber industry, widely used in making tyres, rubber hoses, tapes, cables and other rubber products. Classification of rubber:

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

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

Colloidal water dispersion of latex as rubber;

Liquid rubber is an oligomer of rubber, and it is usually viscous liquid before vulcanization;

Powdered rubber is used to process latex into powder, in order to make ingredients and make it.

3 according to the use and divided into general type and special type.

The general rubber has good comprehensive properties and is widely used. The main contents are as follows: natural rubber. Isoprene rubber, also called synthetic natural rubber. Styrene butadiene rubber, referred to as SBR. The butadiene rubber, referred to as BR.

Special rubber refers to some special properties of rubber. There are mainly:

Silicone rubber, referred to as SILICONE

The main chain is composed of silicon and oxygen atoms alternately, with organic groups on silicon atoms. High and low temperature resistance, ozone resistance, good electrical insulation. Use temperature of - 40 DEG C +220 DEG C; in high temperature, oil resistant, abrasion resistance, oil resistance! Especially suitable for automotive engine crankshaft oil seal is not resistant to volatile oil (diesel, gasoline) wear resistance, oxygen, ozone and sunlight (ultraviolet) resistance.

Fluorine rubber. Viton

Synthetic rubber containing fluorine atom in substructure. Generally, the number of fluorine atoms in the fluorine containing unit in the copolymer is expressed as fluorine rubber 23, which is a copolymer of vinylidene fluoride two and three fluorine vinyl chloride. Fluorine rubber has high temperature resistance, oil resistance and chemical corrosion resistance. It is resistant to oil, high temperature, chemical resistance, and has the properties of acid and alkali resistance. Use temperature - 30 +280 C. The utility model is suitable for the oil seal of the crankshaft in the injection engine, the time gauge oil seal, and the O ring and the sealing ring used for the chemical agent

Chloroprene rubber, referred to as CR.

Prepared by polymerization of chloroprene. It has good comprehensive performance, oil resistance, fire resistance, oxidation resistance and ozone resistance. But its density is large, it is easy to crystallize and harden at room temperature, its storage is poor, and its cold resistance is poor.

Butadiene acrylonitrile rubber, referred to as NBR.

Copolymerization of butadiene and acrylonitrile was carried out. With good oil resistance, heat resistance, cold resistance, pressure resistance and water resistance, air tightness and excellent bonding properties, and abrasion resistance is suitable, the temperature is approximately 40 DEG C 120 commonly used, can be used for a long time at the temperature of 120 DEG C in the air or oil at 150 c..

It is easy to be molded into any shape of hydraulic seals with metal, so Ding rubber is most suitable for making seals for hydraulic cylinders with working pressure less than 32Mpa. Specially designed formula, easy to press hair oil: wear resistance can withstand mechanical automobiles shaft speed 3000 rpm / below (at this time the rubber hardness is 70 degrees).

Polyurethane rubber

A kind of synthetic rubber, the highest tensile strength, it has excellent oil resistance, heat resistance, cold resistance, pressure resistance and wear resistance, usually using a temperature of - 40 DEG C to 80 DEG C, polyurethane rubber sealing performance at superior Ding Qing rubber, it is particularly suitable for pressure, high pressure and ultra high pressure hydraulic cylinder seals used in making.

The polysulfide rubber.

Condensation of two halogenated alkanes with sulfides of alkali or alkaline earth metals. It has excellent oil resistance and solvent resistance, but the strength is not high, aging resistance, poor processability, bad smell, and more with nbr.

In addition, there are polyurethane rubber, epichlorohydrin rubber, acrylic rubber and so on.

Characteristics of silica gel

It is divided into coarse pore silica gel and fine pore silica gel

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

Taking adsorption water as an example, the particle size /mm4 ~ 8, dynamic adsorption capacity /%6 ~ 8, air moisture content after drying /g • M-3 0.03, air dew point / temperature -52 after drying

Regeneration temperature / temperature 140~160

Silica gel has larger adsorption capacity for water, lower regeneration temperature and lower price, so silica gel is mainly used to adsorb water and adsorb carbon dioxide and acetylene at low temperature in air separation unit. Its disadvantage is more powder.

There are two kinds of silica gel: rough hole and fine pore, and the two have different pore size. The pore size of crude silica gel is 5 ~ 10nm (1nm=10-9m, NM), and the specific surface area of silica gel is 100 ~ 300m2/g. Its water absorption capacity is strong, and after water absorption is not easy to break, mechanical strength is good, commonly used in the dryer adsorption of moisture. The pore diameter of the silica gel is 2.5 ~ 4nm, and the specific surface area is 400 ~ 600m2/g. Commonly used to adsorb carbon dioxide and acetylene, adsorption moisture easily broken. The adsorption process is carbon dioxide adsorber in -110 ~ -120 under low temperature, good adsorption effect of CO2, also can adsorb acetylene. Because the temperature lower than -130 DEG C carbon dioxide solid precipitation, solid carbon dioxide not only adsorbed silica gel, and will plug the adsorber. The adsorption of acetylene is carried out in liquid air and oxygen in the adsorber, the adsorption temperature at -170 ~ -180 degrees celsius.

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Huizhou DE sheng electronics co., LTD

Telephones: 0752-3296856    13928381455 

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Company address: guangdong province huizhou city huiyang district autumn long xintang village, sand hills workshop




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