 HomeNewsHuayuan silicone factory Analyze the advantages and disadvantages of rubber products that you don't know

Huayuan silicone factory Analyze the advantages and disadvantages of rubber products that you don't know

2022-07-11

Natural rubber NR

(NaturalRubber) is made of latex collected from rubber trees. It is a polymer of isoprene. It has good wear resistance, high elasticity, breaking strength and elongation. It is easy to age in the air and becomes sticky when heated. , Easy to swell and dissolve in mineral oil or gasoline, resistant to alkali but not strong acid, advantages: good elasticity, acid and alkali resistance. Disadvantages: Not weather-resistant, not oil-resistant (vegetable oil-resistant) is the raw material for making tapes, hoses, and rubber shoes, and is suitable for making shock-absorbing parts, products used in automotive brake fluid, ethanol and other liquids with hydroxide radicals.

Styrene Butadiene Rubber SBR

(StyreneButadieneCopolymer) Copolymer of butadiene and styrene, compared with natural rubber, has uniform quality, less foreign matter, better wear resistance and aging resistance, but weaker mechanical strength, can be mixed with natural rubber. . Advantages: low-cost non-oil-repellent material, good water resistance, good elasticity below 70 hardness, poor compressibility at high hardness, disadvantages: strong acid, ozone, oil, grease and fat are not recommended. some of the hydrocarbons. Widely used in tire industry, shoe industry, cloth industry and conveyor belt industry.

Butyl rubber IIR

(ButylRubber) is the polymerization of isobutylene and a small amount of isoprene. Because the movement of the three-dimensional barrier molecule of methyl group is less than that of other polymers, the gas permeability is less, and the resistance to heat, sunlight and ozone is large. Electrical appliances Good insulation; great resistance to polar solvents, the general operating temperature range is -54-110 ℃, advantages: impermeability to most common gases, butyl rubber IIR rubber products have good resistance to sunlight and odors Resistance can be exposed to animal or vegetable oils or to vaporizable chemicals. Disadvantages: It is not recommended to use petroleum solvents, kerosene and aromatic hydrogen at the same time as inner tubes, leather bags, rubber plaster papers, window frame rubbers, steam hoses, heat-resistant conveyor belts, etc. for automobile tires.

Hydrogenated butadiene rubber HNBR

(HydrogenateNitrile) Hydrogenated nitrile rubber is a nitrile rubber that has been hydrogenated to remove part of the double chain. After hydrogenation, the temperature resistance and weather resistance of rubber products are much higher than that of general nitrile rubber, and the oil resistance is similar to that of general nitrile rubber. The general operating temperature range is -25~150℃. Advantages: better abrasion resistance than nitrile rubber, excellent corrosion resistance, tensile strength, tear resistance and compression properties, good resistance under atmospheric conditions such as ozone, generally suitable for laundry or dishwashing in the cleaning agent. Disadvantages: It is not recommended to be used in the air-conditioning and refrigeration industry in alcohol, ester or aromatic solutions, and is widely used as a seal in the environmentally friendly refrigerant R134a system.

Automotive engine system seals

Ethylene propylene rubber EPDM (Ethylenepropylene Rubber) is made of ethylene and propylene copolymer, so it has excellent heat resistance, aging resistance, ozone resistance and stability, but it cannot be sulfur-added. To solve this problem, the main chain of EP is A small amount of the third component with double chains is introduced on the top and can be vulcanized to become EPDM. The general operating temperature is -50~150 ° C, and it has excellent resistance to polar solvents such as alcohol and ketone. Advantages: ethylene propylene rubber EPDM rubber products have Good weather resistance and ozone resistance, excellent water resistance and chemical resistance, can use alcohols and ketones, high temperature steam resistance, good gas impermeability. Disadvantages: Not recommended for food use or exposure to aromatic hydrogen. Seals for high-temperature water vapor environments Sanitary equipment seals or parts. Rubber parts in braking (brake) systems. Seals in the radiator (car radiator).

Nitrile rubber NBR

(NitrileRubber) is made by copolymerizing acrylonitrile and butadiene. The content of acrylonitrile is from 18% to 50%. The higher the content of acrylonitrile, the better the resistance to petrochemical hydrocarbon fuel oil, but the lower temperature performance. Poor, the general operating temperature range is -25~100℃. Nitrile rubber is one of the most commonly used rubbers for oil seals and O-rings in rubber products. Advantages: good oil resistance, water resistance, solvent resistance and high pressure oil resistance, good compressibility, wear resistance and elongation force. Disadvantages: Not suitable for use in polar solvents, such as ketones, ozone, nitro hydrocarbons, MEK and chloroform, for making fuel tanks, lubricating oil tanks and in petroleum-based hydraulic oil, gasoline, water, silicone oil, diester system Rubber parts used in fluid media such as lubricating oil, especially sealing parts, can be said to be the most widely used and lowest cost rubber seals at present.

Neoprene CR

(Neoprene, Polychloroprene) are polymerized from chloroprene monomer. The vulcanized rubber has good elasticity and wear resistance, is not afraid of direct sunlight, has particularly good weather resistance, is not afraid of violent distortion, is not afraid of refrigerants, and is resistant to dilution. Acid and silicone ester-resistant lubricating oil, but not phosphate ester-based hydraulic oil, easy to crystallize and harden at low temperature, poor storage stability, large expansion in mineral oil with low aniline point, the general operating temperature range is -50~ 150℃, advantages: good elasticity and good compression deformation, the formula does not contain sulfur, so it is very easy to make, has the characteristics of resistance to animal and vegetable oils, and will not be affected by neutral chemicals, fats, oils, and various oils. Solvents affect physical properties, and have flame-retardant properties.

Disadvantages: It is not recommended to use seals that are resistant to R12 refrigerant in chemicals such as strong acids, nitro hydrocarbons, esters, chloroform and ketones, and rubber parts or seals on household appliances. It is suitable for making all kinds of parts that are in direct contact with the atmosphere, sunlight and ozone. Suitable for all kinds of fire-resistant and chemical-resistant rubber products.

Fluorine rubber FKM

Advantages and disadvantages of fluororubber and its applicable medium

Fluorocarbon is an elastic polymer with fluorine atoms attached to the carbon atoms of the main chain or side chain of the molecule obtained by polymerization or polycondensation of fluorine-containing monomers. Due to the different fluorine-containing monomers used in manufacturing, fluororubber has many varieties, which can be divided into fluorine-containing olefin copolymers and nitroso copolymers. Specifically, according to the chemical composition, it can be divided into fluorine-containing olefin-type fluorine rubber, fluorosilicone rubber, nitroso fluorine rubber, fluorinated acrylate rubber, fluorinated phosphazene rubber, fluorine-containing ether rubber, etc. Fluorine rubber has the characteristics of high temperature resistance, oil resistance and corrosion resistance of various chemicals, and is an indispensable material for cutting-edge science and technology such as modern aviation, missiles, rockets, and aerospace. With the continuous improvement of the automotive industry's requirements for reliability and safety, the amount of fluororubber used in automobiles has also increased rapidly.

Temperature range: -45℃~204℃

Advantages: Excellent chemical stability, resistance to most oils and solvents, especially various acids, aliphatic hydrocarbons, aromatic hydrocarbons and animal and vegetable oils Excellent high temperature resistance Good aging resistance Excellent vacuum performance ·Excellent mechanical properties ·Good electrical properties ·Good permeability

shortcoming:

Not recommended for ketones, low molecular weight esters and nitro-containing compounds Poor low temperature performance Poor radiation resistance

Applicable media:

1. Mineral oil, ASTM No. 1 oil IRM902 oil and 903 oil

2. Non-flammable HFD hydraulic oil

3. Silicone oil and silicone ester

4. Mineral and vegetable oils and fats

5. Aliphatic hydrocarbons (butane, propane, natural gas)

6. Aromatic hydrocarbons (toluene, xylene)

7. Chlorinated hydrocarbons (trichloroethane, carbon tetrachloride)

8. Gasoline (including high alcohol gasoline)

9. High vacuum

Not applicable media:

1. Glycol-based brake fluid

2. Ammonia, amine, alkali

3. Superheated steam

4. Low molecular weight organic acids (formic acid and acetic acid)

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 HomeNewsHuayuan silicone factory Analyze the advantages and disadvantages of rubber products that you don't know

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