With the continuous progress of recycled rubber production technology, more and more recycled rubber can be used in the production of environment-friendly rubber products, which can effectively reduce the cost of raw materials while ensuring the environmental protection of products. When using recycled rubber 2ELYY1027 to produce environment-friendly rubber products, the polluting type compounding agent should never be used. Xiao Bian will discuss with you today the selection techniques of compounding agent in the formula curing system of environment-friendly recycled rubber products.
In the vulcanization system, auxiliary agents containing secondary amino groups will decompose into secondary amines during processing. Secondary amines react with nitrogen oxides to generate nitrosamines, which enter the human body and can change the structure of human DNA to cause cancer. The common auxiliary agents containing secondary amino groups in vulcanization system additives include sulfur donor DTDM, accelerator TMTD, NOBS, ZDC, BZ, EZ, etc.
When the recycled rubber is used to produce environment-friendly rubber products, the primary amino group of the same kind can be used for the subsulfonyl NOBS, DZ, DIBS, DEBS, etc. containing secondary amino groups. The accelerants CZ and NS can replace NOBS, and appropriate CTP can be added when necessary; The properties of accelerator AMZ and NOBS are similar. Accelerator TBSI is a non secondary amine accelerator, which can replace NOBS and DIBS and has better resistance to reversion.
When it is necessary to use thiuram type accelerators in environment-friendly recycled rubber products, the thiuram type TMTD, TMTM and TETD containing secondary amino groups can be replaced with accelerators TBzTD, TOTN, IT, IU, DBEC, IZ, etc., and the secondary amine generated by decomposition is less volatile; Or use phosphate accelerator without ammonia in molecular structure, such as ZDEP and ZDBP.
When using recycled rubber to produce environment-friendly rubber products, DTDM and OTOS sulfur donors containing secondary amino groups are not recommended; DTDC, accelerator DTDM and MDB can be used instead.
Anti coke agent is a substance that can prevent early vulcanization of rubber compound during processing, including nitroso compounds (such as N-nitrosodiphenylamine, etc.), organic acids (such as benzoic acid, phthalic anhydride, etc.) and thiosulfides (such as N-cyclohexylthiophthalimide). Among them, anti coke agent NA, as a nitrosamine compound, should not be used when using recycled rubber to prepare environment-friendly rubber, and it is recommended to use anti coke agent CTP instead.
When using recycled rubber to produce environment-friendly rubber products, rubber product manufacturers need to select environment-friendly recycled rubber that has passed the certification of relevant environmental protection directives, and reasonably design the curing system, reinforcement filling system, anti-aging system, softening and plasticizing system of environment-friendly recycled rubber products to ensure the environmental protection of rubber products. Later, Xiaobian will continue to share with you the selection skills of other compounding systems when producing environment-friendly rubber products from recycled rubber.
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