Q:How to test the abrasion resistance of rubber?

It is mainly divided into two kinds of natural rubber and synthetic rubber. Natural rubber is made from rubber, rubber and grass. Synthetic rubber is obtained by polymerization of various monomers. Rubber products are widely used in industry or in all fields of life. It has a wide range of uses. [1] can also be divided into rubber with natural rubber, general rubber, styrene butadiene rubber, nitrile rubber, silicone rubber, butadiene rubber, butyl rubber, EPDM rubber, chloroprene rubber types.

Q:How long is the warranty period for EPDM?

(1). Rubber molding, after pressing, the elastic body is within the cohesion can not be eliminated, the molding die, often have a very unstable contraction (rubber shrinkage due to rubber vary), required after a period of time, and can be stable. Therefore, when a rubber product design at the beginning, regardless of formula or mold, it is necessary to carefully calculate the coordination, if not, it is easy to produce product size instability, resulting in lower quality products.(2). A rubber elastic body of thermosetting plastic hot melt, belongs to the hot cold setting. Rubber due to different types of sulfide species, its molding and curing temperature range is also a considerable gap, and even can be affected by climate change, indoor temperature and humidity affected. Therefore, the production conditions of rubber products need to be adjusted at any time. If not, the quality of the products may be different.(3) rubber products are made of rubber raw materials and used as raw materials made from the rubber compound of the mixer, and the formula is designed according to the characteristics of the required rubber products, and the required hardness of the products is determined. The product is made and molded by rubber flat vulcanizing machine. Finally, the product is processed by flying edge, and the surface of the product is treated smoothly without burrs.(4). Aging test of rubber products aging test belongs to the category of rubber aging refers to rubber and products in the processing, storage and use of the process, due to the comprehensive effect of internal and external factors caused by the performance of the structure change, then the loss of use value phenomenon. They are crazing, sticking, hardening, softening, powdering, discoloration, mildew, etc..

Q:How to clean rubber products?

Rubber molding, after pressing, the elastic body is within the cohesion can not be eliminated, the molding die, often have a very unstable contraction (rubber shrinkage due to rubber vary), required after a period of time, and can be stable. Therefore, when a rubber product design at the beginning, regardless of formula or mold, it is necessary to carefully calculate the coordination, if not, it is easy to produce product size instability, resulting in lower quality products.

Q:How to identify the tire rubber is raw or cooked

Rubber is a kind of polymer material with high elasticity, is the parent material manufacturing of rubber products, generally refers to the rubber unvulcanized. A nearly neutral liquid produced by a rubber tree and added with 0.05%~0.1% ammonia water to make latex (for a short period of time). Most of the latex need processed dry glue, all kinds of natural rubber is often said.

Q:Why does rubber burn black smoke?

Rubber is filled with black carbon, which is used to dye, but to increase hardness, burning black smoke.

Q:How to distinguish between good and bad silicone rubber gasket?

When the silica gel products are subjected to alternating stress (or strain), the structure and properties of the material change. With the development of fatigue process, the failure of silica gel products is called fatigue damage. Therefore, fatigue is also a way to distinguish the quality of silicone products.

Q:Is silicone good or rubber good?

Rubber is divided into natural rubber and synthetic rubber, natural rubber structure is isoprene polymer, synthetic rubber such as polybutadiene rubber, chloroprene rubber, styrene butadiene rubber. When rubber is deformed by the external force, the crosslinked rubber has the ability to recover quickly, and has good physical and mechanical properties and chemical stability.Silicone rubber is mainly composed of high molecular weight linear polysiloxane. The Si-O-Si key is the basic bond formed, mainly methyl silicon atoms connected, introduced a very small amount of unsaturated groups in side chain, intermolecular interactions, molecular spiral structure, methyl arrangement and can freely rotate outward, thus vulcanized silicone rubber has excellent resistance to high and low temperature (-100~315 DEG C). Weather, water repellent, electrical insulation, physiological inertia and other characteristics, are widely used in military, medical, industrial and agricultural production and people's daily life. Most importantly, there is no toxicity, as usual in pacifiers and breast implants.

Q:Rubber products labeled Huai gum can improve wear?

Today, white carbon (silica) is added to the tread formula, which is not for abrasion resistance, but for skid resistance of wet pavements, and is resistant to cutting in truck tires.

Q:How to improve the hardness of rubber?

Increasing the degree of crosslinking (increasing the dosage of vulcanizing agent and prolonging the curing time properly);Increase the dosage of reinforcing agent, or choose reinforcing agent with high structure and large specific surface area;Hardening resin, high styrene and other hardening agent;

Q:What advantage does ethylene propylene rubber with three yuan compare to two yuan ethylene propylene rubber?

In recent years, the third monomer and new technology development, foreign developed 1 7- octadienoic, 6, 5, two 10- methyl -1, 9- eleven, 7- two three ene 3, methyl -1, 6- octadienoic, 5 7-, two methyl -1, 6- octadienoic, 7- methyl -1, 6- octadiene as the three EPDM third monomer, the performance of three Yuan rubber has been enhanced. The monomer and content of third monomer in three yuan ethylene propylene rubber have direct influence on vulcanization rate and vulcanizate property. Among them, dicyclopentadiene (DCPD) as the third monomer, although the price is low, but the three Yuan rubber vulcanization speed is slow, difficult and high degree of unsaturation diene rubber and use; to ethyiidenenorbomene (ENB), 6 10-, two methyl -1, 5, third monomer three Yuan rubber vulcanization speed 9- eleven three ene as fast, the former has become the main varieties of three yuan of ethylene propylene rubber. The third monomer content in iodine said three EPDM iodine value is generally 6-30, mostly around 15. The iodine value is 6-10, curing speed is slow, difficult and high unsaturated rubber; iodine value is 25-30, for ultra high speed curing type, available in any proportion and high unsaturated diene rubber and use. Therefore, three yuan ethylene propylene rubber and other rubber in use, should pay attention to choose the appropriate three yuan ethylene propylene rubber varieties.