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Company news
position: > News > Company news

Rubber vulcanization process

date: 2016-12-06 source: Century creation

  Before unvulcanized rubber, do not produce a crosslinking between molecules, so the lack of good physical and mechanical performance, little practical value. When rubber vulcanization agent, after heat treatment or other way can make the rubber molecules between crosslinking, form the three-dimensional network structure, so that its performance is greatly improved, especially the stretching stress, elastic rubber, hardness, tensile strength and a series of physical and mechanical properties are greatly improved. Rubber molecules under heating and crosslinking agent of sulfur produces chemical reaction, crosslinking become the process of three-dimensional network structure. After vulcanization of rubber vulcanizates. Vulcanization is the last process in rubber processing, can get the finalize the design has the practical value of rubber products.
  The main factors influencing the curing process
  Sulfur dosage. Its dosage, the greater the curing speed faster, can be and the higher the degree of cure. Sulfur solubility in the rubber is limited, too much sulfur will by the rubber surface precipitation, commonly known as "sprayed sulfur. In order to reduce the sulfur spray phenomenon, requirements at the lowest possible temperature, or at least under the sulfur melting point and sulfur. According to the requirements of the rubber products use, dosage of sulfur in the soft rubber is generally not more than 3%, in the semi-rigid glue dosage, generally about 20%, in hard glue dosage can be as high as above 40%.
  Curing temperature. If high temperature 10 ℃, shortens the curing time in half. Because the rubber is bad conductors, products of vulcanization process because of its each part of the temperature differences and different. In order to ensure more uniform degree of cure, thick rubber products generally USES sulfide rising up, low temperatures over long periods of time.
  Curing time. This is an important part of the vulcanization process. Time is too short, lack of degree of cure (also called owe sulfur). Time is too long, high degree of cure (commonly known as sulfur). Only the suitable degree of cure (commonly known as positive sulfide), to ensure that the best comprehensive performance.
  Rubber vulcanization process method According to the curing conditions can be divided into cold cure, room temperature vulcanizing and three types of heat vulcanization.
  Sulfide, cold cure can be used for film products, products in carbon disulfide containing 2% ~ 5% sulfur chloride solution impregnation, rinse and dry.
  , room temperature curing, the curing process at room temperature and pressure, such as using room temperature vulcanized rubber slurry mixing rubber (solution) for bicycle inner tube joint, repair, etc.
  , hot sulfide is the main method of rubber vulcanization. According to different sulfide medium and the form of sulfide, can be divided into the direct sulfide, indirect heat vulcanization vulcanizing and mixed gas sulfide three methods.
  (1) direct sulfide, sulfide products directly into hot water or steam medium.


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