Cold tolerance refers to the provisions of the rubber, the low temperature can keep the rubber elasticity and ability to work properly.
Choose cold tolerance would produce glue is the key to cold resistance.
cold resistant performance mainly depends on the variety of rubber.
For an amorphous type rubber, glass transition temperature is low, good cold resistance.
For crystalline rubber seals
, cold tolerance want to consider the height of glass transition temperature, crystallization conditions.
Increasing rubber chain flexibility, less molecular inter-atomic forces, and the space steric hindrance, weaken the regularity of the macromolecular chain of rubber components and structural factors that are conducive to improve the cold resistance of rubber seals.
Adjustment of cold tolerance in the design of rubber and rubber formula of commonly used methods, such as SBR and BR, NBR and NR, CO, ECO, can improve the cold resistance of the rubber.
Crosslinked bond types affect the cold resistance of rubber.
Natural rubber using conventional vulcanization system, with the increase of the dosage of sulfur, the shear modulus increase, the glass transition temperature rise, too.
Selection of appropriate and efficient vulcanization system, rubber glass transition temperature than conventional vulcanization system reduce 7 ℃.
So NR and SBR, DCP vulcanization has the best cold resistance.
Causes of these differences is that the sulfur vulcanization, the sulfur in the generated more keys at the same time, also generates molecular documentsmust cross-links, and cyclization reaction, thus makes the segment decreased activity, elastic modulus, glass transition temperature rise.
Reduce half an effective or efficient curing system of sulfur, and usage, the more sulfur decrease in the number of keys, mainly produce single sulfur keys and disulfide bond, intramolecular combined with the possibility of sulfur is reduced, so the glass transition temperature rise more sulphur keys.
Proper softening plasticizing system to improve the cold resistance of rubber.
Join plasticizer, can make the rubber glass transition temperature drop.
Poor cold tolerance of nitrile rubber, neoprene rubber polarity, mainly by adding proper plasticizer to improve its cold resistant performance.
Because can increase molecular flexible rubber plasticizer, lower molecular inter-atomic forces, the molecular chain segments to sports, should choose its polarity polarity rubber so close, close to the solubility parameters of plasticizer.
Soften the plasticizer type and dosage of the cold resistance of rubber is crucial.
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