Category: Rubber technology

Ethylene propylene diene monomer (EPDM) is a rubber made of ethylene and propylene through solution copolymerization, and then introduced into the third monomer (ENB). EPDM is basically a saturated polymer with excellent aging resistance, weather resistance, electrical insulation, chemical corrosion resistance and impact elasticity. The main disadvantage of ethylene propylene rubber is its slow curing speed; It is difficult to blend with other unsaturated rubbers, and the self adhesion and mutual adhesion are very poor, so the processing performance is poor. According to the performance characteristics of ethylene propylene rubber, it is mainly used in the fields that require aging…

1. Plasticizing mechanism Rubber is plasticized to increase its plasticity. Its essence is to break rubber molecular chains and reduce the length of macromolecules. Fracture can occur not only in the main chain of macromolecules, but also in the side chain. As rubber is subject to oxygen, electricity, heat, mechanical force, plasticizer and other factors during plasticizing, the plasticizing mechanism is closely related to these factors, among which oxygen and mechanical force play an important role, and they complement each other. Generally, plasticizing can be divided into low-temperature plasticizing and high-temperature plasticizing. The former is dominated by mechanical degradation, and…

1. Natural rubber (NR) is mainly rubber hydrocarbon (polyisoprene), containing a small amount of protein, water, resin acid, sugar and inorganic salt. High elasticity, high tensile strength, good tear resistance and electrical insulation, good abrasion resistance and drought resistance, good processability, easy to bond with other materials, and superior to most synthetic rubbers in comprehensive performance. The disadvantages are poor oxygen resistance and ozone resistance, easy to aging and deterioration; Poor oil and solvent resistance, low acid and alkali resistance; The heat resistance is not high. Operating temperature range: about - 60 ℃~+80 ℃. To make tyres, rubber shoes, rubber…

1、 Flammability of rubber Most rubbers have varying degrees of flammability. And the rubber containing halogen in the molecule, such as neoprene, fluororubber, etc., has a certain flame resistance. Therefore, chloroprene rubber and chlorosulfonated polyethylene containing chlorine atoms are difficult to burn even after removing the external flame, while fluororubber is completely self extinguishing. The flame retardancy of the compound can be improved by adding flame retardants (such as phosphate or halogen containing substances). 2、 Gas permeability (gas tightness) of rubber The gas permeability of rubber is the product of gas solubility and diffusion in rubber. The gas solubility decreases…

Performance of silicone rubber seal ring I Imported silicone rubber seal ring English name: Silicone gasket (Molecular structure) CH3 CH=CH 1、(Si-O) (Si-O) methyl vinyl silicone rubber CH3 CH3 2、 Physical and chemical properties of imported silicone sealing ring Silica gel ring is a saturated non-polar rubber based on silicon obtained from quartz and formed by silicon atoms adhering to side chains such as methyl, vinyl, etc. Different side chains will lead to different characteristics of silicone rubber. Methyl vinyl silicone rubber (VMQ) is a kind of silicone rubber material which is widely used. Silica gel ring has excellent heat resistance,…

Compared with other types of sealing rings, rubber O-ring has the following advantages: 1. Suitable for various sealing forms: static sealing, dynamic sealing Suitable for all kinds of materials, the size and groove have been standardized, and the interchangeability is strong 2. Suitable for multiple motion modes: rotary motion, axial reciprocating motion or combined motion (such as rotary reciprocating combined motion) 3. Suitable for various sealing media: oil, water, gas, chemical media or other mixed media Through the selection of appropriate rubber materials and appropriate formula design, it can effectively seal oil, water, air, gas and various chemical media. The temperature…

1. Without the use of lubricant, reduce the friction coefficient, so that the installation of O-ring is simple, and help prevent the problem of O-ring adhesion. 2. The O-ring can avoid the use of lubricants such as oil, talcum powder or silicone oil. 3. The chemical resistance and weather resistance of O-ring are improved, and the O-ring is free from corrosion of solvent, salt water, etc. 4. Make the O-ring color coded for easy identification. Polyfluoro paint can provide a range of color O-ring products, from traditional black to orange. 5. The O-ring can be made of low-cost rubber substrate.…

The connecting rod is a power functional component connecting the piston and the crankshaft. The small end of the connecting rod is connected with the piston through the piston pin, and the large end of the connecting rod is connected with the connecting rod journal of the crankshaft, and the gas pressure borne by the piston is transmitted to the crankshaft, so that the reciprocating motion of the piston is transformed into the rotary motion of the crankshaft. The shape of the connecting rod is irregular and complex, which makes it difficult to locate. The reducer is connected by a…