Category: Rubber Products knowledge

During the processing, storage and use of rubber and its products, the physical and chemical properties and mechanical properties of rubber gradually deteriorate due to the combined effect of internal and external factors, and finally lose their use value. This change is called rubber aging. The surface is cracked, sticky, hardened, softened, powdery, discolored, mildewed, etc. A) Oxygen: the oxygen reacts with the rubber molecules in the rubber by free radical chain reaction, and the molecular chains break or cross link excessively, which causes the change of rubber properties. Oxidation is one of the important reasons for rubber aging. B)…

Improper design and use of O-ring will accelerate its damage and lose its sealing performance. The experiment shows that if each part of the sealing device is reasonably designed and the pressure is simply increased, the O-ring will not be damaged. Under the working conditions of high pressure and high temperature, the main causes of O-ring damage are the permanent deformation of O-ring materials and the clearance bite caused by O-ring being squeezed into the sealing clearance, and the O-ring is distorted during movement. 1. Permanent deformation Because the synthetic rubber material used for O-ring seal ring is viscoelastic material,…

Rubber O-ring products are widely used Rubber for computer and peripheral equipment: non-standard customized rubber products and various sealing and damping rubber parts for office automation equipment. Electronic and electrical appliances: used for various customized rubber products and rubber sealing products of electronic and electrical appliances. Rubber for automobile industry: used for sealing and damping rubber products in automobile industry. Medical rubber products: various rubber products, rubber stoppers and bottle stoppers used for medical equipment and consumables. Other industrial rubber: various rubber products used in other industries for sealing, shock absorption, conductivity, insulation and other purposes. Rubber for special equipment:…

Nitrile butadiene rubber NBR (Nickel Rubber) is made by copolymerization of acrylonitrile and butadiene. The acrylonitrile content ranges from 18% to 50%. The higher the acrylonitrile content, the better the resistance to petrochemical oil hydrocarbon fuel oil, but the low temperature performance becomes worse. The general use temperature range is - 25~100 ℃. Nitrile butadiene rubber is one of the most commonly used rubber for oil seal and O-ring. advantage: ·It has good characteristics of oil resistance, water resistance, solvent resistance and high pressure oil resistance. ·Good compression deflection, abrasion resistance and elongation. Disadvantages: ·Not suitable for use in polar…

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…