Preparation of 1,4-benzenedimethanol crosslinking modified petroleum resin
Methanesulfonic acid(MSA)was selected as proton acid catalyst and 1,4-benzenedimethanol(PXG)as crosslinking agent for crosslinking modification of C9 petroleum resin which was used as coating material existing the problems of low softening point and low carbon residue yield.The effects of reaction temperature,the amount of PXG and MSA(PXG and MSA accout for the mass fraction of petroleum resin)on the softening point and carbon residue yield of the modified resin were investigated.The modified resin was characterized by Fourier transform infrared spectroscopy,gel permeation chromatograph,thermogravimetrric analysis and scanning electron microscope.The results show that the optimum process conditions are as follows:the reaction temperature is 220℃,the mass fraction of PXG and MSA are 9%and 7%,respectively.The softening point of the modified resin is increased to 115.9℃and the carbon residue yield can reach 19.84%(w)under the conditions.The weight average molecular weight and thermal stability of the modified resin are significantly improved than those of the unmodified resin.
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