Nitrile reclaimed rubber is a kind of reclaimed rubber made of waste nitrile rubber products after desulfurization process and the like, and retains the characteristics of nitrile rubber. Therefore, nitrile rubber can be used as reference for nitrile rubber reclaimed rubber when selecting vulcanization system.
The vulcanizing agent commonly used in nitrile reclaimed rubber vulcanization system is sulfur. Since the unsaturated degree of nitrile rubber is lower than that of natural rubber, the amount of sulfur required is slightly lower than that of natural rubber. In order to speed up the vulcanization rate, the amount of vulcanization accelerator can be omitted Higher than natural rubber. When the acrylonitrile content of nitrile reclaimed rubber is high and the relative content of butadiene is low, the amount of sulfur required may be reduced as appropriate. The manufacture of soft rubber, the general amount of 1.5 to 2 parts of sulfur, when the amount of more than 2.5 parts, will make the vulcanizate hardness increased rapidly, the relative elongation decreased.
The use of sulfur as a vulcanizing agent for the nitrile rubber reclaimed rubber vulcanization system requires the use of accelerators to increase the vulcanization rate, DM, CZ, TMTM, TMTD and the like commonly used in the nitrile reclaimed rubber vulcanization systems, and the basic accelerators such as Aldehydes and amines, guanidine accelerators when used alone, prone to scorch phenomenon and compression deformation increases, it is not applicable. Sulfur with accelerator DM, CZ vulcanization faster, vulcanized rubber performance is better, is commonly used vulcanization system:
1, Nitrile regeneration rubber curing system in the use of accelerator DM, the amount of 1.5 to 2 parts, the amount of 1.5 parts of sulfur, the use of such accelerators, the process is relatively safe, scorch resistance second only to the use of CZ, etc. Latex accelerator compound, vulcanizates tensile strength and tensile strength are relatively high. Accelerator DM may also be used in combination with other accelerators to increase the activity and to enhance certain properties of the vulcanizates. For example, with TMTD bottles, the tensile strength can be increased and compression set can be reduced. However, scorch should be noted and used in an appropriate amount , When the second accelerator TMTD is added, the amount of DM is usually 1 part and TMTD is 0.15 parts, and when the TMTD is 0.2 to 0.5 part, scorching is easy.
2, when using CZ as nitrile rubber reclaimed vulcanization accelerator, its dosage is 0.5 to 1, the amount of sulfur is 1.5, the vulcanization system rubber is not easy to scorch, vulcanizate than the use of DM Well, the compression deformation is small.
3. When using TMTM as a promoter in the nitrile reclaimed rubber vulcanization system, the dosage is 0.6 parts and the amount of sulfur is 1 part. The vulcanized rubber has high tensile strength, high tensile strength and small compression deformation. When TMTM dosage increases and permanent deformation A corresponding reduction. Zinc oxide, cadmium oxide, stearic acid are active agent, the amount of zinc oxide is generally 5 parts, cadmium oxide dosage is 2 to 5 parts, stearic acid is generally 1 part. If sulfur-free sulfur-free curing system, such as with about 3.5 parts of TMTD curing, due to the vulcanized rubber structure with single-sulfur cross-linking dominant, and reduce the sulfur compounds within the pollution of the environment, which significantly increased vulcanization Glue heat aging and tear resistance. When the amount of TMTD large, often frost phenomenon, mixed with some accelerator CZ can eliminate this phenomenon.
In addition, nitrile rubber reclaimed rubber can also be used low-sulfur system, such as with 2.5 parts of TMTD and 0.2 to 0.3 parts of sulfur vulcanized, vulcanized rubber also has good heat aging properties and better mechanical properties.
Cadmium or magnesium sulfide system can be used, the vulcanized rubber can have excellent heat aging and heat aging properties of oil, and compression deformation. The main components of nitrile reclaimed rubber low sulfur cadmium and magnesium vulcanization system are 2 to 5 parts of cadmium oxide, 1.5 to 7 parts of cadmium diethyldithiocarbamate, 5 parts of magnesium oxide, 1 part of sulfur, the accelerator DM0.5 ~ 2.5 parts. In the vulcanization process, the super-accelerator of cadmium diethyldithiocarbamate can make the vulcanizates mainly form single-sulfur cross-linking bonds, which can further improve the structure of the vulcanizates and improve the heat aging resistance of the vulcanizates when used together with cadmium oxide performance. When the amount of DM used as the second accelerator is 1 part, the heat-resistant property can be improved and the tendency of coke reduction can be reduced. Magnesium oxide control of plastic PH value, the amount of 5 copies of the best heat resistance and strength values.
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