A brief introduction of the commonly used antioxidant

Rubber and its products in the long-term storage and use process, due to heat, oxygen, ozone, constant metal ions, mechanical stress, light, high-energy rays role, and other chemicals and the role of the mildew, gradually reduce so that they lose the original physical and mechanical properties of process known as aging. With the aging process and development, rubber and the products performance will be gradually reduced so that completely lost the use value. In order to prolong the service life of rubber products, will be in the rubber with some can restrain the aging process of material and prolong the rubber and products of the storage period and long service life. These substances called rubber antioxidant.

A wide range of rubber antioxidant , function each different. According to its main function can be divided into oxygen resistance aging agent, antiozonant, harmful metal ions inhibitors, resist fatigue agent, uv absorber, resistance to cracking agent. But, since each kind of protection function often is not a certain kind of rubber antioxidant purpose-built, most of several factors can rubber antioxidant aging role, the difference degree only. The AIDS will wire and cable industry commonly used in the introduction rubber antioxidant .

1.Rubber antioxidant D: this product is weak gray powder, tasted of white powder, flammable. Specific gravity of 1.18, melting point not below 105 ℃. Soluble in acetone, ethyl acetate, carbon disulfide, chloroform; Soluble in ethanol, carbon tetrachloride; Insoluble in water and gasoline. In the air and sunlight gradually become to black, but not influence the protective effect. For natural rubber, rubber antioxidant D of synthetic rubber universal rubber antioxidant . On the heat, oxygen, around the parched and bowed all have good general aging factors of protection. To harmful metal ions have inhibition, with rubber antioxidant 4010 and if, heat resistant, oxygen, around the parched and bowed ozone resistance function are increased significantly. This product easy to spread, dosage is about 0.5 ~ 2.0 a. More than two will spray frost.

2.Rubber antioxidant RD and rubber antioxidant 124: rubber antioxidant RD and for the same kind of rubber antioxidant 124 chemical compositions, different is rubber antioxidant RD for resin shape, and rubber antioxidant 124 for powder, rubber antioxidant RD for amber to hoar resin powder, non-toxic shape. Softening point not below 74 ℃. rubber antioxidant 124 for hoar powder, melting point for 114 ℃. Rubber antioxidant RD and rubber antioxidant 124 soluble in acetone, benzene, chloroform, carbon disulfide; Slightly soluble in petroleum hydrocarbons, insoluble in water. Have ever but not significant. Not easy spray frost, had no effect on the role of sulfide. Flammable, non-toxic. Applicable natural rubber and butyl benzene, intently, synthetic rubber, dosage is commonly 0.5 ~ 3 copies.

3.Rubber antioxidant MB: white or light yellow appearance of crystal powder, has a bitter taste, non-toxic. Specific gravity is 1.42, melting point for 285 ℃, soluble in ethanol, acetone, ethyl acetate; Soluble in methylene chloride; Insoluble in carbon tetrachloride, benzene, and water. A little polluting, easy scattered. When the dosage of more than 2 has spray frost phenomenon. When those weak effect, appropriate and rubber antioxidant DNP and have synergy effect. Rubber antioxidant MB used as copper inhibitors, can weaken the rubber vulcanization agent on the role of copper wire, can significantly improve rubber vulcanization copper wire and black, rubber tacky when the phenomenon. As sulfide rubber antioxidant MB delay agent role. Rubber antioxidant MB general dosage is 1 ~ 2.5 copies.

4.Rubber antioxidant DNP: the product is a light gray powder. Is tasted for light color bright flake crystallization, specific gravity is 1.26. Melting point for 235 ℃. Many small. Dosage of more than 2 to spray frost. Is the thermal resistance, resistance to atmospheric oxygen, aging rubber antioxidant comprehensive. It is a good copper inhibitors, and to promote the agent of Margaret have an activation. rubber antioxidant DNP and MB, DOP, etc and have synergy effect. Applicable natural rubber and neoprene, styrenebutadiene rubber, butadiene rubber and intently rubber synthetic rubber. Average amount of 0.2 ~ 1 a.

5.Rubber antioxidant NBC: commodity called rubber antioxidant NBC, the appearance is dark grey powder, melting point not below 83 ℃, no pollution, easy scattered, for the fine antiozonant. Can be used in heat resistance, resistance to atmospheric aging resistance, around the crack down the rubber. In neoprene, chlorine ether rubber can improve the heat resistance, thermal stability. Apply to a synthetic, chlorine ether, chlorinated polyethylene, butyl rubber, butyl benzene rubber synthetic rubber, dosage for 1 ~ 2 copies.

Commonly used rubber is introduced here simple rubber antioxidant in use process of rubber antioxidant rubber to combine the rubber products and the characteristics of rubber antioxidant to reasonable selection of rubber antioxidant .