Pre-dispersion production of rubber additives
1. Production process At room temperature, add the rubber mixture to the internal mixer for internal mixing. The internal temperature of the internal mixer was 65-75°C. After a period of internal stirring, the base rubber is obtained. At this point, the accelerators and auxiliary materials are added, followed by internal mixing for 5-10 minutes. After […]
Rubber vulcanizing agent
Rubber additives have many different kinds, the role is also complex, the current international use of a total of more than 3000 kinds. According to their nature, can be classified as the following categories: curing agent, accelerator, active agent, reinforcing filler, plasticizer, antioxidant, coloring agent, and latex special additives and other special purpose additives. One curing […]
What is the role of magnesium oxide and zinc oxide in rubber?
Magnesium oxide and zinc oxide in the rubber is mainly to play a liquidity and antioxidant capacity, increase the tensile strength of rubber and impact resistance. Second, the reaction of zinc oxide as an active agent with an organic accelerator, stearic acid, sulfur and the like occurs during the vulcanization process on the surface of […]
Vulcanization process of rubber
Rubber vulcanization process can be divided into four curing stages: scorch stage, pre-sulfur phase, sulfur phase, over-sulfur phase. (1) Scorch stage, also known as the curing induction period, at this stage, cross-linking has not yet begun, the compound in the model have good mobility. Rubber vulcanization start speed, directly affect the rubber scorch and operation […]
Description of the application of the active agent
1.In the sulfur vulcanization accelerator system, the widespread use of zinc oxide and stearic acid as activator 2.When the manufacture of transparent products, because the basic zinc carbonate soluble in rubber, which instead of active zinc oxide, available transparency 3.Non-carbon black reinforcement in the compound can be added polyols, amino alcohols active agent to reduce […]
Environmentally friendly product
With the enhancement of environmental awareness and health concerns, it has been found that the vulcanizing agent DTDM and thiuram products will crack at the sulfidation temperature to release secondary amine-based molecular fragments that can be combined with the nitroso donor to produce carcinogenic Nitrosamine substances, so the curing agent DTDM and Qiu LAM products […]
Countervailing duties
November 3, 2016, the US Customs issued a notice under the WTO rules and the 1930 Tariff Act requirements, the US Department of Commerce in the anti-subsidy preliminary ruling 120 days after the suspension of the imposition of countervailing duties. The US Customs will no longer impose countervailing duties on passenger-car tires imported from China […]
Sulfur compounds
Sulfur donors are those that release sulfur upon vulcanization and therefore may be sulfur-free or sulfur-less. Products are curing agent DTDM (disulfide dimorphorpholine), disulfide – N, N ‘- lactam, trisulfide bis (diethyl thiophosphoryl), four sulfide diporphorpholine, diethyl disulfide Thiocarbamate, thiocarbamate, thiocarbamate, rubber vulcanization accelerators TMTD, TMTM, TETD, TBTD, DDTS, PTD, DPTT, TBzTD, sulfur monochloride, carbon […]
Rubber vulcanizing agent
Rubber will have no intermolecular crosslinking if it is uncured , its chemical structure is essentially a linear or slightly branched macromolecules. Thus the lack of good physical and mechanical properties, no great practical value. However, when the vulcanized rubber after its structure into three-dimensional network structure, its performance have changed in nature, greatly improving its elasticity, […]
Classified according to the role of rubber chemicals
1.Rubber vulcanizing agent includes vulcanizing agent (crosslinking agent), accelerators, activators and retarders and the like. 2. Rubber protective additives include antioxidants, anti-ozone agents, anti-flex cracking agents, light stabilizers, ultraviolet light absorbers, harmful metal inhibitors, physical antioxidant, anti-termite agents, preservatives and the like. 3. Rubber reinforcing additives include carbon black, silica, metal oxides, inorganic salts, resins, […]