Butadiene rubber /NBR is polymerized from propylene and butadiene. The propylene content is 18%-50%. The higher the propylene content, the greater the harm to the petrochemical industry.
The better the temperature resistance of hydrocarbon fuel oil, the worse the low temperature performance. Generally speaking, the temperature range is 25 degrees Celsius-100 degrees Celsius ... Men.
Rubber is one of the most commonly used rubber materials for oil seals and O-rings. Advantages:
1, with good oil resistance, water resistance, solvent resistance and high-pressure oil resistance.
2. It has good compression deformation, wear resistance and elongation.
Disadvantages:
1 is not suitable for polar solvents, such as ketone, ozone, nitrohydrocarbon, MEK and chloroform.
1, used for manufacturing olefin fuel tanks, running.
Lubricating oil tanks and fluids, such as petroleum hydraulic oil, gasoline, water, silicone grease, silicone oil, diester lubricating oil and glycol hydraulic oil.
Rubber parts used in media, especially seals. It can be said that it is the most widely used rubber seal with the lowest cost at present.
Hydrogenated cis-1,4-polybutadiene rubber /HNBR Hydrogenated cis-1,4-polybutadiene rubber is hydrogenated cis-1,4-polybutadiene rubber, with some double chains removed. After hydrogenation, its temperature resistance and weather resistance are improved.
It is much higher than ordinary butyl rubber, and its oil resistance is similar to ordinary butyl rubber. Generally speaking, the temperature range is 25 degrees Celsius -65438 degrees Celsius +050 degrees Celsius ... Advantages
：
1 has better wear resistance than cis-polybutadiene rubber.
2. Excellent corrosion resistance, tensile resistance, tear resistance and compression deformation.
3. It has good resistance under the conditions of ozone, sunlight and chemical oxygen.
Generally speaking, it is suitable for washing clothes or washing dishes.
Disadvantages:
1. It is not recommended to use in alcohol, ester or aromatic solution. 1, environmental protection refrigerant R 134a is widely used in air conditioning and refrigeration industry.
Seals in the system.
2, automobile engine system seals.
The main chain of EPDM/EPDM is not double-stranded, so it has the advantages of heat resistance, aging resistance and ozone resistance.
Excellent stability, but sulfur cannot be added. In order to solve this problem, a small amount of double-stranded third component was introduced into the main chain of EP.
EPDM can be obtained by adding sulfur to sulfur. For polar solvents, such as alcohol, ethanol and ethylene glycol, the general temperature range is 50 ℃- 654 ℃+ 050℃.
And phospholipid hydraulic oil has excellent tolerance. Advantages:
1, good weather resistance and ozone resistance.
2. Excellent water resistance and chemical resistance.
3. Both alcohol and stimulant can be used.
4. It is resistant to high temperature steam oxygen and has good gas impermeability.
Disadvantages:
1, not recommended for food and roads or contact with aromatic hydrogen. 1. Seals in high temperature water vapor environment.
2, sanitary equipment seals or parts.
3. Rubber parts in the braking (braking) system.
4. Seals in radiator (automobile water tank).
5. Outdoor protective cover.
The main chain of silicone rubber/silica gel is composed of silicon (-si-o-si). Excellent heat resistance, cold resistance, ozone resistance and aging resistance.
It has good electrical insulation performance. The tensile strength is worse than that of ordinary rubber, and there is no oil resistance. Advantages:
1, the tensile strength can reach 500PSI and 88LBS.
2, good and good compression deformation.
3. Good resistance to neutral solvents.
4. Excellent heat resistance.
5. Excellent cold tolerance.
6. Excellent ozone and oxide corrosion resistance.
Disadvantages:
1, which is not recommended for use in most concentrated solvents, oils, concentrated acids and dilute sodium hydroxide. 1, household appliances
Seals or rubber parts used in industry, such as rubber parts in electric kettles, electric irons and micro-flow furnaces.
2. Seals or rubber parts in the electronic industry, such as mobile phone keys, shock absorbers in DVD, and seals in cable joints.
3. Seals in various articles that come into contact with the human body, such as kettles and drinking fountains.
The fluorine-containing rubber in fluororubber /FPM molecule is famous for its fluorine content (that is, monomer structure). Fluoride hexafluoride series widely used at present
Rubber was originally put on the market by DuPont under the trademark name "Viton". High temperature resistance is better than silicone rubber, and it has excellent aging resistance and high resistance.
Some oils and solvents (except ketones and esters), weather resistance and ozone resistance; The cold resistance is poor, and the general use temperature range is 25℃
C-250 C, special formula can resist low temperature to-40 C. Advantages:
1, heat resistant to 250 C.
2. It is resistant to most oils and solvents, especially all acids, aliphatic cigarettes, aromatic hydrocarbons and animal and vegetable oils.
Disadvantages:
1, not recommended for ketones, low molecular weight esters and mixtures containing nitrates.
1, automobile, motorcycle, diesel engine and combustion
Material system.
2. Seals of chemical plants.
Silicone fluorine rubber /FLS silicone fluorine rubber is fluorinated silicone rubber, and its general properties have the advantages of both fluorine rubber and silicone rubber. Chinai
Oil resistance, solvent resistance, fuel oil resistance, high and low temperature resistance are all good, and the general use temperature is 25℃-200℃. Advantages:
1, suitable for special purposes, such as oxygen-resistant chemicals, aromatic hydrogen-containing solvents, chlorine-containing solvents, etc.
Disadvantages:
1, contact with brake oil, ketone and hydrazine solution is not recommended.
1, about the space part.
Natural rubber /NR is made of latex collected from rubber trees and is a polymer of isoprene. Temperature resistance: 20 c-100 c. Advantages:
1, with good wear resistance, high elasticity, breaking strength and elongation.
Disadvantages:
1, easy to age in oxygen, sticky when heated, easy to swell and dissolve in mineral oil or gasoline, alkali resistant but not strong acid resistant. 1, which is the system.
It is used as raw material of adhesive tape, rubber hose and rubber overshoes, and is suitable for making shock-absorbing parts, and used in liquid containing hydrogen free radicals such as automobile brake oil and ethanol.
Products.
2. Washers and mats.
The mechanical properties of polyurethane rubber /PU polyurethane rubber are quite good, and its high hardness, high elasticity and wear resistance are unmatched by other rubbers.
Than; Aging resistance, ozone resistance and oil resistance are also quite good. Generally speaking, the temperature is 45 degrees Celsius -90 degrees Celsius ... Advantages:
1, wear resistance and high pressure resistance.
Disadvantages:
1, not high temperature resistant.
1, suitable for industrial high-pressure and wear-resistant seals, such as hydraulic cylinder seals, rollers and shafts.
2. High-voltage commercial charging system.
Compared with natural rubber, styrene-butadiene rubber /SBR- butadiene and styrene-ethyl polymers have uniform quality and less impurities, but their mechanical strength is lower.
Weak, can be mixed with natural rubber. Temperature resistance: 30 c-100 c. Advantages:
1, low-cost oil-resistant material
2. Good water resistance and good elasticity with hardness below 70.
3. Poor compression deformation under high hardness.
4. Most neutral chemicals and dry and nutritious organic ketones can be used.
Disadvantages:
Strong acids, ozone, oils, oil esters and esters and most hydrocarbons are not recommended.
1, widely used in tire industry. shoe
Industry, adhesive tape and conveyor belt industry.
Neoprene /CR is polymerized from neoprene monomer. Vulcanized rubber has good elasticity, wear resistance and is not afraid of direct sunlight.
Excellent atmospheric aging resistance, not afraid of severe distortion, not afraid of refrigerants such as dichlorodifluoromethane and ammonia, and resistant to dilute acid and silicone ester system.
Lubricating oil, but not resistant to phosphate hydraulic oil, easy to crystallize and harden at low temperature, poor storage stability and low aniline point.
The expansion of oil is great. Generally, the temperature range is 50 c150 c. Advantages:
1, good elasticity and good compression deformation.
2, the formula does not contain sulfur, so it is very easy to make.
It is resistant to animals and vegetable oil.
4. It will not affect the medicinal properties due to neutral chemicals, esters, oils, various oils and solvents.
5, with flame-proof characteristics.
Disadvantages:
1. Strong acids, nitrohydrocarbons, esters, chloroform and ketones are not recommended.
1, used to seal R 12 refrigerant.
Pieces.
2. Rubber parts or seals on household appliances.
3, suitable for making all kinds of parts that are in direct contact with the atmosphere, sunlight and ozone.
4, suitable for all kinds of flame retardant and chemical resistant rubber products.
Butyl rubber /IIR is polymerized from isobutyrate and a small amount of isoprene, and a small amount of unsaturated groups are left for sulfur addition. Because of the stereoscopicity of methyl,
Compared with other polymers, barrier mud has less molecular movement, less gas permeability and greater resistance to heat, sunlight and ozone, so electrical appliances are absolutely impossible.
Good fate; It has strong tolerance to polar solvents such as alcohols, ketones and esters. Generally, the temperature range is 54 C110 C. Advantages:
1, impermeable to most common gases.
2. Good sunlight and ozone resistance.
3, can contact with animals or vegetable oil or easily oxidized chemicals.
Disadvantages:
1. It is not recommended to be used together with petroleum solvents, colloidal oil and aromatic hydrogen.
1, used to make rubber resistant to chemical corrosion and vacuum equipment.
Parts.
Acrylate rubber /ACM is an elastomer polymerized with alkyl acrylate as the main component, which is resistant to petrochemical oil, high temperature and corrosion.
The weather resistance is good, but the mechanical strength, compression deformation and water resistance are weak, which is slightly worse than the general oil-resistant adhesive. Commonly used temperature range
Advantage of 25 c170 c:
1, suitable for automobile oil transportation.
2. It has good oxidation resistance and weather resistance.
3. It has the function of resisting bending deformation.
4. Excellent oil-resistant product performance.
5, suitable for automobile transmission system and power steering wheel.
Disadvantages:
1, not suitable for hot water.
2. Not applicable to brake oil.
3, do not have the function of low temperature resistance.
4. Not applicable to phosphate ester.
1, automobile transmission system and power system seal.
Chlorosulfonated polyethylene rubber /CSM chlorosulfonated polyethylene is a kind of synthetic rubber patented by DuPont. Heat resistance, weather resistance and ozone resistance are all.
Good; Acid resistance is also good, often used in places where antioxidant drugs (nitric acid, sulfuric acid) are used. The general temperature standard is 45 degrees Celsius 120 degrees Celsius.
Advantages:
1, good ozone resistance, oxidation resistance and flame retardancy.
2. Physical properties are similar to that of chloroprene rubber, and it has better acid resistance.
3. Excellent wear resistance.
4. It has the same low friction surface as NBR.
5. It is recommended to use it in water to prevent leakage.
Disadvantages:
1. Exposure to high concentrations of oxidized acids, nitrohydrocarbons, esters, dioxins and aromatic hydrogen is not recommended. Arc baffle, insulating pad.