Research On The Radiation Vulcanization Of Nitrile Butadiene Rubber Latex (NBRL)

Nitrile Butadiene Rubber is one kind of the more consumption special rubber, its application is extremely wide range, mainly for the production of oil-resistant hose products and inflaming retarding conveyor belts, sealing products, gloves and so on, it is also one of absolutely necessary kind rubber for car production. This research is referred to conditions and performance of Nitrile Butadiene Rubber vulcanization. Firstly, Mixing up Nitrile–Butadiene Rubber Latex (NBRL) and n-BA (n-Butyl acrylate) or poly functional monomer (PFM) TMPTMA (Trimethylolpropane trimethylacrylate) and make it well-distributed, then irradiated by 60Coγ-ray or EB(electron beam) at room temperature, let it become films naturally after adding anti-aging agent, after that testing its mechanical properties and analyzing the cross-linking rule, and were characterized by Fourier Transform Infrared Spectroscopy. And then mixing up Nitrile–Butadiene Rubber latex and n-BA (n-Butyl acrylate) or poly functional monomer (PFM) TMPTMA (Trimethylolpropane trimethylacrylate) and make it well-distributed, took proper amount of latex and let it become films on glass dish, and then irradiated by electron beam at room temperature, after that testing its mechanical properties and analyzing the cross-linking rule, and were characterized by Fourier Transform Infrared Spectroscopy. We can get some results as follows:(1) Both 60Coγ-ray and electron beam(EB) can improve the mechanical properties of NBR. The original tensile strength of NBR is about 0.65MPa, and the original elongation at break of NBR is above 2500%.(2) On the condition that the absorbed dose was about 30kGy and the sensitizer was n-BA the tensile strength of NBR reach to the maximum about 2.33MPa with the addition of n-BA was 1phr (parts per hundreds of rubber) byγ-ray. While the sensitizer was TMPTMA and its addition was 2phr the tensile strength of NBR reach to the maximum also 2.33MPa with the absorbed dose was 30kGy byγ-ray. When the addition of TMPTMA was between 1phr and 3phr, the tensile strength of NBR can keep in a large value. In conditions of the absorbed dose of NBRL byγray irradiation was less than 30kGy, the tensile strength of NBR was improved while the absorbed dose was increased; In conditions of the absorbed dose of NBRL byγ-ray irradiation was more than 30kGy, the tensile strength of NBR became lower while the absorbed dose was increased. When the absorbed dose exceeded 60kGy, we cannot test its mechanical properties because the NBRL can hardly become films. The elongation at break of NBR showed the trend of reduced as the absorbed dose was increased.(3) In conditions of the absorbed dose was 60kGy and the addition of n-BA was 1phr, the tensile strength can reach the maximum about 3.73MPa with the mixture of sensitizer n-BA and NBRL irradiated by electron beam. The tensile strength of NBR can keep in a larger lever by the sensitizer n-BA and the absorbed dose was between 50 and 60kGy. In conditions of the absorbed dose was 50kGy and the addition of TMPTMA was 2phr, the tensile strength can reach the maximum about 3.62MPa with the mixture of sensitizer TMPTMA and NBRL irradiated by EB. The tensile strength of NBR improved obvious when the absorbed dose was between 50 and 70kGy.(4) The mechanical properties of NBR films can improve irradiated by EB, especially its tensile strength improved obviously. In this research, the tensile strength of NBR reached the maximum about 5.86MPa while the addition of n-BA was 1phr and the absorbed dose was 60kGy. The tensile strength of NBR was in the range of 1.7MPa while the absorbed dose was among 50kGy and 70kGy. The sensitization of TMPTMA was better than the sensitization of n-BA. The tensile strength reached maximum about 6.60MPa which is ten times of the t original tensile strength of NBR while the addition of TMPTMA was 2phr and the absorbed dose was 50kGy. The tensile strength of NBR was above 6MPa while added proper amount of TMPTMA and the absorbed dose among 50 and 80kGy. The evolution of films of NBR`s tensile strength irradiated by EB were the same as the rules of NBR`s tensile strength irradiated byγ-ray. While the addition of sensitizer was certain, the tensile strength of NBR increased to a steady state value as the increasing of absorbed dose, and then the tensile strength would become lower and lower as the increasing of absorbed dose.(5) Through infrared spectroscopic analysis, the NBR produced mainly functional group were carboxyl-,keto-,ester function , the link or degradation of carbon chain, increased the number of tertiary carbon atoms and quaternary carbon atoms and so on after irradiation byγ-ray or EB. (6)This research used Fuzzy Subtractive Clustering building the tensile strength of radiation vulcanization of NBRL Model .It was obvious that fuzzy model identification method showed the affection among absorbed dose, the addition of sensitizer and NBR. It can be directly perceived the evolution of tensile strength of NBR. Using fuzzy modeling method to apply to materials has opened up new ideas.The main innovative works of this research were as follows:Firstly, using irradiation technologies on NBRL and selected two more effective sensitizer n-BA and TMPTMA. Secondly, using Fuzzy Subtractive Clustering building the tensile strength of radiation vulcanization of NBRL Model and It can be directly perceived the evolution of tensile strength of NBR. Using fuzzy modeling method to apply to materials has opened up new ideas and provided a theoretical basis for process control of NBR.