The vulcanization process of natural balata is balata macromolecule the process that cross-linking of catenary happening chemistry reacts. Can divide roughly for 3 phase:

The 1st phase is revulsive phase, sulfureous element and accelerant system (accelerant, zinc oxide, tristearin is acerbity) reaction makes the intermediate compound with a kind of bigger active, it causes balata element catenary to arise further but the freedom of cross-linking base.

The 2nd phase is cross-linking reaction phase, but cross-linking chain reaction produces between freedom radical and balata element catenary, build cross-linking chain.

The 3rd phase forms level for net compose, produce the reaction such as the recomposition that cross-linking bolts and splitting decomposition possibly at the same time, here the reaction of later period cross-linking of level stops basically already, the reaction such as the recomposition that what happen subsequently basically is cross-linking key and splitting decomposition (namely " vulcanization is returned former " reaction) .

Average vulcanizing system produces more not stable much sulfur cross-linking to bolt in middling of vulcanization cross-linking process, it and photograph of key of odd sulfur cross-linking heat up instability than often be being shown, on vulcanization curve expression is the as vulcanization time extension after arriving at the biggest torque, torque drops gradually.

One of main fields that catalysis is application of particle of accept Mi Chaowei, accept rice exceeds small particle to compare area and tall active high but significantly promotional catalysis efficiency. Accept rice exceeds small particle to was used at the respect such as modified of plastic, traditional coating to already also gained remarkable success. This job studied accept rice zinc oxide regards vulcanizing activator as the influence that vulcanization of complex to natural balata system reacts, compare with the action photograph of common zinc oxide at the same time. ) of product of Malaysia of natural balata SMR20(; ) of zinc oxide plant of city of common ZnO(Anqing; ) of limited company of science and technology of rice of accept of sea of abundant of Shanxi of accept rice ZnO(.

Basic recipe (quality compares) : SMR20(100) , tristearin is acerbity (1. O) , sulfureous (2. 5) , one annulus of accelerant Ⅳ personal radical one 2 one benzene and thiazole radical second sulphonic acid amide (CZ)(1. O) , znO(5. O) .

Refine is mixed on machine opening temper with fire by groovy method, in the vulcanization on flat vulcanization machine (total actuating pressure is 100 T, vulcanization temperature is 151 C) . One MD of RheoTECH(R) without rotor vulcanization appearance, product of company of American TECH PRO, place horny 4- _1. , frequency 1. 7 Hz, vulcanization curve checks below 151 C, determine vulcanization time T. . (Spend the computation when be 9O with cross-linking) and anxious burn time T. (Spend chronometer of the ％ that it is 1O to calculate) with cross-linking, calculate vulcanization returns former index R, after Rt shows vulcanization curve achieves highest torque, drop 0. The time that place of M of · of 1 DN needs.
Previous12 Next

Previous:Not the application of dissolve sex brimstone in balata
Next：Butyl balata is basic knowledge