About Rubber
1. Natural rubber (NR) is mainly composed of rubber hydrocarbons (polyisoprene), containing small amounts of protein, water, resin acids, sugars, and inorganic substances
● Good processability, easy to bond with other materials, and superior in comprehensive performance compared to most synthetic rubbers. The disadvantage is poor oxygen and ozone resistance, and it is prone to aging and deterioration
● High temperature range for use: approximately -60 ℃~+80 ℃. Produce insulation layers and sheaths for tires, rubber shoes, rubber hoses, adhesive tapes, wires and cables, as well as other common products such as rubber metal suspension components, membranes and molded products.
2. Styrene butadiene rubber (SBR) is a copolymer of butadiene and styrene. Performance close to natural rubber, it is currently the most widely produced universal rubber
● The disadvantages are: low elasticity, poor resistance to bending and tearing; Poor processing performance, especially poor self adhesiveness and low strength of raw rubber.
● Range for use:Plates, hoses, rubber shoes, and other general products.
3. Butadiene rubber (BR) is a cis structured rubber made by polymerizing butadiene. The advantages are excellent elasticity and wear resistance, as well as aging resistance.
● Low, poor tear resistance, poor processability and self-adhesive properties.
● Temperature range for use: approximately -60 ℃~+100 ℃.
● Usually used in combination with natural rubber or styrene butadiene rubber
4. Isoprene rubber (IR) is a cis structured rubber polymerized from isoprene monomers. Chemical Composition, Stereoscopic Structure, and Astronomy
● Most of the advantages of rubber are aging resistance. Due to natural rubber, its elasticity and strength are slightly lower, its processing performance is poor, and its cost is higher.
● Range for use:Adhesive tape and other common products.
5. Chloroprene rubber (CR) is a polymer polymerized by chloroprene as monomer lotion. This type of rubber molecule contains chlorine atoms.
● It has the advantages of self extinguishing, oil resistance, solvent resistance, acid and alkali resistance, aging resistance, and good air tightness; Its physical and mechanical properties are also better than natural rubber, so it can be used as a universal rubber
● Relatively high cost, poor electrical insulation, easy to stick, roll, burn, and mold during processing. In addition, raw rubber has poor stability and is not easy to store.
Range for use:
Cable sheath and various protective covers and shields; Rubber hoses, tapes, and chemical liners that are resistant to oil and chemical corrosion; Fire resistant rubber products for underground mining.
6. Butyl rubber (IIR) is a copolymer of isobutene and a small amount of isoprene or butadiene. The biggest feature is good air tightness and odor resistance (such as sulfuric acid, nitric acid, etc.) and general organic solvents have good vibration absorption and damping properties, as well as excellent electrical insulation.
● The disadvantages are poor elasticity, poor processing performance, and sulfur +120 ℃.
● Mainly used as inner tubes, water tires, balloons, insulation layers for wires and cables, lining and shock-absorbing products for chemical equipment, heat-resistant transport belts, and heat-resistant aging adhesives.
NR: Good viscosity and high strength of raw rubber
SBR: Generally has an odor and can be brushed
NBR: Severe cold flow situation
EPDM: has an odor, the rubber is relatively brittle, like rice grains
First, brush the gasoline and you can find out which one is Ding Qing (you can try it yourself)
The remaining four types can be pulled by hand, with EPDM and SBR being brushed and NR and CR being non brushed
When smelling EPDM and SBR, you can usually ask about their odor, and they can also be burned (the specific method is difficult to express), NR and CR are easy to distinguish due to their different tastes. If the film has been used for a long time, you can press it on the machine to determine the difference. Also, CR has a hard feeling when left for a long time, but if it's not a mixed glue, it's still easy to tell it.
7. Nitrile rubber (NBR) is a copolymer of butadiene and acrylonitrile. The characteristic is particularly good resistance to gasoline and fatty hydrocarbon oils.
● Good wear resistance and water resistance, with strong adhesion.
● The disadvantages are poor cold and ozone resistance, low strength and elasticity, poor acid resistance, and poor electrical insulation.
● Mainly used for manufacturing various oil resistant products, such as rubber hoses, sealing products, etc.
8. Hydrogenated nitrile rubber (HNBR) is a copolymer of butadiene and acrylonitrile. It is achieved by fully or partially hydrogenation of NBR in butadiene.
● NBR is good, and its other properties are the same as nitrile rubber.
● The disadvantage is that the price is relatively high.
● Temperature range for use: approximately -30 ℃~+150 ℃.
● Mainly used for oil and high temperature resistance
9. Ethylene propylene rubber (EPM) is a copolymer of ethylene and propylene, generally divided into ethylene propylene diene monomer rubber and ethylene propylene diene monomer rubber.
● Good performance in terms of durability, chemical resistance, impact elasticity, acid and alkali resistance, low specific gravity, and can be used for high filling coordination. Heat resistance up to 150 ℃, resistant to polar solvents such as ketones and esters.
● And superior to styrene butadiene rubber.
● The disadvantage is poor self adhesion and mutual adhesion, making it difficult to bond.
● Temperature range for use: approximately -50 ℃~+150 ℃.
● Mainly used for chemical equipment,rubber products and other industrial products.