Study On Structure And Properties Of SBR Coagulated By Jetting

Styrene butadiene rubber, referred to as SBR, is composed of styrene butadiene latex by flocculation, soap, washing, drying and pressing into the pack prepared. The SBR industrial using polymer coagulant-sulfuric acid coagulation system to produce styrene butadiene rubber (SBR-a), a large number of wastewater generated during the solidification process of serious environmental pollution. To study the solidification mechanism and method of SBR, and explore a green production solidification method is the aim of the study. The jet solidification method to prepare styrene butadiene rubber (SBR-j) and analyze the performance of SBR; at the same time, using the RPA, TG, DMA, DSC, electronic tensile testing machine and other instruments to character and analyze the structure and properties of CB/SBR composite and pure vulcanized SBR.The results were as follows:(1)The ash content and soap content of SBR-j were significantly higher than that of SBR-a, the content of volatile and organic acid of SBR-a was lower than that of SBR-j,the Mooney viscosity of SBR-j and SBR-a were close to the values.(2)Infrared analysis showed that SBR-j and SBR-a were slightly different on rubber structure,The raw SBR-j has characteristics of disproportionated rosin acid potassium salt was the asymmetric vibration absorption peak at 1540cm-1, The raw SBR-a has obvious characteristics of organic acid in the carbonyl stretching vibration absorption peak in 1700cm-1.(3)The vulcanization time of induction, the scorch time and curing time of pure vulcanized SBR-j is short, the maximum torque value of MH is relatively low; but the minimum torque value of ML is relatively high; This indicates that the processing safety of SBR-j is poor. The swelling degree of SBR-j was larger than that of SBR-a pure rubber, and the cross-linking density was smaller. The 300% elongation force, tensile strength, elongation at break, permanent deformation of pure vulcanized SBR-j was higher than that of pure vulcanized SBR-a; both the shore hardness of the same. The aging resistance of pure vulcanized SBR-j is better.There is a slight difference in the glass transition temperature of pure vulcanized SBR-j and pure vulcanized SBR-a. The initial thermal stability of pure vulcanized SBR-j was better, and the weight loss rate of SBR-j was slightly lower. The loss factor of pure vulcanized SBR-j and pure vulcanized SBR-a was basically consistent with the change of temperature, The maximum value of the loss factor of pure vulcanized SBR-a was higher than that of pure vulcanized SBR-j.(4)The induction time, the char burn time and the curing time of CB/SBR-j composites are shorter, and the maximum torque value MH is lower, but the lowest torque value ML is higher; This indicates that the processing safety of CB/SBR-j composites is poor. The swelling degree of CB/SBR-j composites was higher than that of CB/SBR-a composites, and the relative density of CB/SBR-j composites was less than that of CB /SBR-a composites. The fracture toughness of CB/SBR-j composites is better than that of CB/SBR-a composites, and the permanent deformation is also larger, The 300% elongation force, tensile strength and tear strength of CB/SBR-j composites are lower than that of CB/SBR-a composites. The aging resistance of CB/SBR-j composites is better than that of CB/SBR-a composites. At low strain levels, the modulus of elasticity of CB/SBR-j composites is higher than that of CB/SBR-a composites; when the strain level is higher, the elastic modulus of CB/SBR-j composite is lower than that of CB/SBR-a composite materials. The loss factor of CB/SBR-j composites is higher than that of CB/SBR-a composites. The glass transition temperature of CB/SBR-j composites and CB/SBR-a composites was slightly different. The initial thermal stability of CB/SBR-j composites is better, and the heat loss rate is higher. The loss factors of CB/SBR-j composites and CB/SBR-a composites are consistent with the change of temperature, The maximum value of loss factor of CB/SBR-a composite materials is higher than that of CB/SBR-j composite materials.