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RMCD Rubber Mechanochemical Chain Scission Depolymerizing
Name:RMCD Rubber Mechanochemical Chain Scission Depolymerizing
After years of concentrate study, we finally broke the technical bottleneck and successfully developed the second-generation RV rubber reclaiming agent- RMCD rubber mechano-chemical chain scission depolymerizing agent (hereinafter referred to as RV2 generation). It overcomes the disadvantages of domestic and foreign relevant products, which have slow sheeting, high Mooney viscosity, high energy consumption, etc. and surpasses the first generation product RV rubber reclaiming agent of our company and the De-link of Malaysian.
Characteristics: Applied by many domestic manufacturers, it obviously shortened the processing time, increased the break elongation, and reduced the Mooney viscosity of the revived rubber. What is the most important is that the dosage is induced. It needs only 2 parts by weight of RMCD (RV2 generation) per 100 parts by weight of waste rubber, which saves the company reclaiming agent cost of 200 yuan more than the first generation when recycling one tone waste rubber, and realizes energy saving and emission reduction.
The revived rubber can vulcanize without adding any vulcanizing agent and accelerator, which can save the processing aid valued 500 yuan, (GB/T13460-2008 the standard recipe of the reclaimed rubber is: reclaimed rubber 300g,accelerator NS 2.4g,zinc oxide 7.5g, sulfur 3.5g, stearic acid 1.0gof which one ton of the reclaimed rubber need to consume the processing aid valued 500 yuan to vulcanize production)so one ton of the waste rubber only needs the reclaiming agent valued 200 yuan to revive to the rubber product.
If 20% of the revived rubber is used to substitute the raw compound rubber, the dosage of the accelerator in the raw compound rubber can be reduced about 20%, which can further save the costs about 100 yuan. At present, RMCD rubber mechanochemical chain scission depolymerizing agent (hereinafter referred to as RV2 generation) is suitable for the application of deep products.
Technique: First, turn the roll pitch of the open mill to the minimum (zero pitch, add the rubber (10-40 meshes) or 100 parts by weight of the waste rubber leftovers and 2 parts by weight of the rubber reclaiming agent RV2 Generation to the open mill, mill for 12 min and mix evenly; then sheet out. The roll temperature should be below 70℃.
Using the refining mill has good effect and high efficiency, and the whole process can be finished in 8 min.
At the same time, we developed the coordination reclaiming of the rubber mechano-chemical reclaiming reactor and the rubber double-screw extruder, which realized the successive production.
We realized the reviving of the waste rubber at normal temperature and pressure, and formed the assembly production line, which is a leap of the rubber reviving technique.
Principlea subject that when the solid material is added with mechanical energy, its solid state, crystal structure, etc. change, as a result that the physical and chemical property change is called mechano-chemical. The rubber machinery sheering and shattering process is accompanied with the impact of the mechano-mechanical, when the force works on the waste rubber, the force initiation is produced, and the active particles are generated, at the same time creating force splitting, and generating molecule chain break sheet with big free radicals property. When degrading the vulcanized rubber, the free radicals are on the C—C= bond instead of C—S bond, but when there is C—Sn—C bond, 30% C—C bond will be directly destroyed, while 70% is chain broken caused by the shift of the unpaired electron to the sulfur created by breaking the C—C bond. The splitting does not always happen on the weakest bond, but can also happen on the stronger bond, when there is weaker C—S bond, it can split on the C—C bond. As the atomic energy of the RMCD rubber mechano-chemical chain scission depolymerizing agent and the lone pair electrons of the sulfur atoms among the sulfur organic compound form a coordination bond, making S—S bond and S—C bond be weaker, and cutting S—S bond and S—C bond under the mechanical force and in this way we can reclaim the waste tire rubber powder. As the rubber mechano-chemical chain scission depolymerizing agent RMCD has many chain-break options, the break of the rubber molecule main chain C—C bond is small, so the revived rubber keeps higher physical property.
References: ①②③H.K. БАРАМБОйМ High Molecular Compound Mechano-mechanical
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