Identifying rubber types:
1. Natural rubber (NR)
The raw material of natural rubber comes from rubber plant trees. Its advantages are: good elasticity, high strength, good insulation, small deformation, and convenient processing. Its disadvantages are: poor oil resistance, poor temperature resistance, and easy aging, all of which are used in combination. We generally produce car tires and some shock-absorbing and wear-resistant rubber parts.
2. Synthetic adhesive
Synthetic adhesives include: styrene butadiene rubber (SBR), nitrile rubber (NBR), butadiene rubber (BR), ethylene propylene rubber (EPDM), butyl rubber (IIR), chloroprene rubber (CR), acrylic ester rubber (ACM), hydrogenated nitrile rubber (HNBR), chlorosulfonated polyethylene (CSM), fluorine rubber (FKM), silicone rubber (MVQ), etc.
2.1 EPDM
Advantages: Excellent aging resistance, weather resistance, good electrical insulation, good impact elasticity, and oil resistance.
Disadvantages: Slow vulcanization speed, poor self-adhesive performance, poor thermal tearing performance, and poor processing performance.
Usage: Manufacturing heat-resistant transport belts, steam hoses, chemical resistant seals, shock absorbers and waterproof materials, as well as automotive cups and rings.
2.2 Nitrile rubber (NBR)
Advantages: Excellent oil resistance, as well as good heat resistance, aging resistance, wear resistance, corrosion resistance, and other properties.
Disadvantages: Poor cold resistance, acid resistance, electrical insulation, and tear resistance.
Usage: Mainly used for manufacturing products such as oil seals, shaft seals, and gaskets (O-rings), it can also be used for manufacturing oil resistant hoses, transport belts, rubber rollers, vacuum hoses, shock absorption products, and textile accessories.
2.3 Styrene butadiene rubber (SBR)
Advantages: Good heat resistance, aging resistance, and wear resistance.
Disadvantages: Poor cold resistance, elasticity, bending resistance, cracking resistance, tear resistance, and poor processing performance. Small plasticity changes, large rolling deformation, and poor self-adhesion.
Usage: Mainly used for inflatable tires, followed by rubber shoes, rubber hoses, tape, rubber rollers, adhesive tape and model products, vacuum cleaner sealing rings, such as suction sealing rings.
2.4 Neoprene rubber (CR)
Advantages: Good flexibility, heat resistance, aging resistance, acid and alkali resistance, good elasticity, and good airtightness. Has cold and water resistance.
Disadvantages: Poor storage stability, easy crystallization, and poor electrical insulation.
Usage: Mainly produces rubber parts in household appliances and air conditioners.
2.5 butadiene rubber or polybutadiene rubber (BR)
Advantages: good elasticity, low temperature resistance, and wear resistance.
Disadvantages: Low tensile and tear strength, poor wet slip resistance, and poor adhesion.
Usage: Mainly used for manufacturing tires, it can also be used to manufacture wear-resistant products (such as rubber shoes, rubber rollers), cold resistant products, and shock-absorbing products.
2.6 Butyl rubber (IIR)
Advantages: The biggest feature is good airtightness, excellent resistance to weather aging, light aging, chemical resistance, and good resistance to high temperature and cold. The long-term working temperature can be below 130 ℃; The effect of absorbing shock or vibration is better, and the electrical insulation is better.
2.7 Acrylic Acid Adhesive (ACM)
Advantages: It has good heat and oil resistance properties and is stable in lubricating oils containing sulfur, phosphorus, and chlorine additives. Simultaneously resistant to aging, oxygen and ozone, UV radiation, and excellent airtightness. Temperature range for use: approximately -25~+150 ℃.
Disadvantages: Poor cold resistance, not resistant to water, not resistant to steam, organic and inorganic acids and alkalis. Severe expansion occurs in water-soluble solutions such as methanol, ethylene glycol, and ketone esters. At the same time, it has poor elasticity and wear resistance, poor electrical insulation, and poor processing performance.
Usage: Can be used to manufacture oil resistant, heat-resistant, and aging resistant products, such as seals, rubber hoses, chemical linings, etc.
2.8 Hydrogenated nitrile rubber (HNBR)
Advantages: High mechanical strength and wear resistance, better heat resistance than NBR when cross-linked with peroxide, and other properties similar to nitrile rubber. Temperature range for use: approximately -30~+150 ℃.
Disadvantage: The price is relatively high.
Usage: Mainly used in sealing products that are resistant to oil and high temperatures.
2.9 Chlorosulfonated polyethylene (CSM)
Advantages: Excellent ozone and aging resistance, with better weather resistance than other rubbers. Flame retardant, heat-resistant, solvent resistant, and resistant to most chemicals, with good acid and alkali resistance. The electrical insulation is acceptable, and the wear resistance is similar to that of butadiene styrene rubber. Temperature range for use: approximately -20~+120 ℃.
Disadvantages: Poor tear resistance and poor processing performance.
Usage: Wire and cable sheath, rubber hose, tape, rubber roller chemical lining.
2.10 Fluororubber (FKM)
Features: Good wear resistance, with good weather aging resistance, light aging resistance, ozone aging resistance, radiation resistance, resistance to gasoline, benzene, toluene, alcohol, and weak acidity. The temperature range for use is about -20 to+200 ℃, special grade -35 to+250 ℃ (can work for a long time at 250 ℃).
Disadvantage: This adhesive is expensive.
Usage: Mainly producing rubber products that are resistant to vacuum, high temperature (such as on airplanes and rockets), chemical corrosion, oil, and high temperature.
2.11 Silicone Rubber (MVQ)
Advantages: It is resistant to both high temperature (up to 300 ℃) and low temperature (down to -100 ℃), making it the best cold and high temperature resistant rubber currently available; At the same time, it has excellent electrical insulation, high stability to thermal oxidation and ozone, and high chemical inertness.
Disadvantages: Low mechanical strength, poor oil and solvent resistance, acid and alkali resistance, difficult to vulcanize, and expensive price.
Usage: Used for making high and low temperature resistant products (rubber hoses, seals, etc.), as well as insulation layers for high temperature resistant wires and cables. Due to its non-toxic and odorless nature, it is also used in the food and medical industries.
2.12 Isoprene rubber (IR)
It is widely used in the tire manufacturing industry due to its stable chemical properties. It has good elasticity, cold resistance (glass transition temperature -68 ℃), and high tensile strength. Under oxidation and multiple deformation conditions, it has a higher resistance to cut and tear than natural rubber, but its processing performance such as mixing and rolling is slightly worse than natural rubber.
3. Mixed rubber
Adding vulcanizing agents, accelerators, activators, reinforcing agents, fillers, softeners, anti-aging agents, and anti crosslinking agents to raw rubber, and uniformly blending them in a rubber mixer, the resulting rubber is called blended rubber
