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The ingredients of domestic fluorine rubber


A, vulcanization system

Type 23 and type 26 fluorine rubber is fluorocarbon saturated, not with sulfurcuring, but in two amine curing agent, curing agent two hydroxy compounds and organic peroxide effect, can cure reaction.

Amine curing agent vulcanized rubber, lower deformation, acid resistance is poor; two benzoyl peroxide acid resistance is good, but the poor heat resistance,process performance is not good. At present, curing agent, curing agentcommonly used mainly is No. 3, No. 4, No. 5 (polyhydroxy compounds) and twobenzoyl peroxide.

No. 3 curing agent name: N, N- dicinnamate fork -1, 6 - hexamethylene diamine;

No. 4 curing agent name: Double - (4- ammonia hexyl cyclohexyl methylcarbamate)

5 curing agent name: hydroquinone (Qing Kun)

23 fluorine rubber is often used two benzoyl peroxide as curing agent, mainly used for acid products; 26 fluorine rubber is used to heat, heat oil products,mainly using amine curing agent (No. 3 curing agent).

Amine curing agent 3, curing agent is easy to disperse, a plasticizing effect on rubber, vulcanized rubber and technological properties, heat resistance andpressure change is. No. 4 curing agent with type 246 fluorine rubber anddevelopment, not widely used; 5 curing agent with Viton

Curing agent E glue and development.

1 two amine curing agent:

There is a - CH2 - CF2 - link molecular fluorine rubber, due to the electronegativity of fluorine atoms is strong, the heat and alkaline compounds(such as amines, such as the presence of magnesium oxide), the easy escape of hydrogen fluoride is formed easily polarized double bond, the fluorine-containing olefin structure readily with nucleophiles such as amines, phenoladdition, and generate the crosslinks. Ordinary two - or polyamine curing to fluorine rubber starts quickly reduces the processing safety, generally uses thepolyamine hidden, to play its role in high temperature, so that delayed vulcanization starts, cyclic carbamate is hidden polyamine representative.

With increasing the amount of curing agent, increases the hardness, strength of vulcanizate, elongation and compression set decreased after high temperature aging, strength retention increased slightly, while the elongation decreased significantly.

Adding acid receptor in conjunction with glue in (i.e., acid absorbing agent), so as to effectively neutralize hydrogen fluoride precipitation fluorine vulcanizationprocess (or hydrogen chloride). Hydrogen fluoride and hydrogen chloride could impede the crosslinked rubber and can further serious corrosion of equipment,because the acid absorbing agent can promote vulcanization crosslinkingdensity increased, with good thermal stability of vulcanized rubber, also known as the active agent or stabilizer. Acid absorption agent and alkali, alkaline is stronger, the higher is the degree of vulcanization vulcanized rubber, hardness,high strength, elongation and compression permanent deformation is small, butthe alkaline is stronger, the processing safety worse, more easy to scorch.Commonly used acid absorbing agent with magnesium oxide, calcium oxide, lead oxide phosphite, two lead, absorption properties have a greater influence onacid agent vulcanized rubber, should be based on the demands of the compound and the appropriate choice. All the heat based formulations should be treated with magnesium oxide as acid acceptor, while requiring lowcompression permanent deformation, available calcium oxide or magnesium oxide and calcium oxide and requirements, acid formula is used for lead acid absorbent. When using zinc oxide and a two base lead phosphite combinations,then heat resistance, but the performance has good resistance to water andhigh temperature steam. Oxide were used in 15~25 copy.

Two amine curing agent and its process safety, thermal aging resistance andcompression set properties are poor. Have proved that the curing system has itsunique properties, such as metal and the firm adhesion, which are often used forsome special products, such as rubber and metal bonding products.

2 two hydroxy curing agent:

This type of curing agent system is currently the most used, rubber are added with the curing agent of fluorine most commercially available. Rubber processorsadding metal oxide acid receptor and fillers made the finished rubber material.

Two hydroxy curing agent as nucleophilic reagents, the use of two hydroxycuring system curing system has a higher crosslinking density, so that the plasticheat vulcanization and anti deformation is to improve.

With two hydroxyl vulcanizing agent sulfur and fluorine rubber must have basic accelerator suitable presence in order to complete the. Has been used in the industry, the rapid development of the accelerator, mainly for the quaternary phosphonium salt and quaternary ammonium salt, its many varieties, such asbenzyl three phenyl phosphorus trichloride, benzyl chloride and phosphorusthree octyl quaternary phosphonium salt and four Butyl Ammonium Hydroxideand its salts, DBU and its derivatives such as quaternary ammonium salt.

Two hydroxy curing the glue material has good processing performance and the performance of anti scorch, curing rate and makes the vulcanized with anticompression permanent deformation performance excellent, but the tear resistance, especially resistance to tearing of the thermal state of not ideal.

3 peroxide vulcanizing agent:

The peroxide vulcanized fluorine rubber fluorine rubber so that the performanceof water vapor is improved. The amount of insoluble volatile by-productsgenerated during vulcanization it is very small.

2, reinforcing system

Fluorine rubber without adding the filler of the vulcanizates with higher strength,reinforcing system although it has certain reinforcing effect, but mainly in order to achieve the improvement of process performance, improve the heat resistance, the hardness of products, reduce the pressure