Research On Property And Structure Of Paper Based Friction Material

This paper focused on the following aspects of paper based friction materials.Theexperiment analyzed the composition of paper based friction materials imported from abroad,and find a higher content of filler and carbon fiber in it.In the experiment,the retention rate of filler and fines was increased by adding microparticle retention system,and the optimum addition amount of various reagents in microparticle retention system was determined.In order to improve the dispersibility of the paper and the dispersion of the slurry,the dispersant of polyethylene oxide was added in the experiment,and theoptimum addition amount of polyethylene oxide was determined.We measured the effects of carbon fiber modification and cotton stalk pulp on the friction wear properties and heat resistance of paper based friction materials,and analyzed the mechanism of carbon fiber's modification and cotton stalk fiber's application.The experiment studied the relationship between porosity and friction and wear properties.The main conclusions are:?1?Paper based friction materials for automobile imported from foreign countries used a lot of carbon fiber and filler and less plant fiber,it had better heat resistance than paper based friction materials for motorcycle.?2?The optimum amount of CPAM was 0.03%of the dry weight of fiber.The filler retention rate of sample with 0.03%CPAM was increased by 20%compared with the sample without CPAM.Compared with using CPAM alone,the filler retention rate increased by 15%when laponite dosage is 0.3%.The effect of use of microparticle retention system is obvious.The best dosage of hectorite is 0.3%.?3?The dispersion of the fiber was improved by using polyethylene oxide dispersion in the experiment.When the dosage of PEO was 0.3%,the variance of the thickness of the base paper was the smallest,and the uniformity of the base paper was the best.When the PEO content continued to increase,the evenness of the base paper became poor.?4?Different treatments have little effect on the heat resistance of carbon fiber.Compared with the base paper prepared by carbon fiber friction material untreated,the tensile index of sample prepared by Michaelis acid modified carbon fiber is improved27.02%,the tensile index of sample prepared by coupling agent modified carbon fiber is improved by 20.45%,the tensile index of sample prepared by Meldrum's acid and coupling agent modified carbon fiber is improved 44.47%,compared with sample prepared by Meldrum's acid treated carbon fiber and coupling agent is increased by13.74%and 19.94%.?5?The cotton stalk fiber has the advantages of low cost,easy access,environmental protection and Sustainability.And the paper based friction material prepared by cotton stalk fiber has the better heat resistance.The tensile index of paper based friction material base paper adding cotton fiber is 282.35%higher than the addition of cotton stalk fiber,The tensile index of paper based friction material prepared by similar resin content is 22.33%higher than that of cotton fiber.Compare with paperbased friction material with cotton fiber,paper based friction material with cotton stalk fiber has higher and more stable friction coefficient and lower wear rate,the cotton stalk fiber could better used in paper based friction material.?6?With the increase of porosity,friction coefficient first increases then decreases,the friction coefficient has the maximum value is 0.1492 when the porosity is 46%.Comparison of three different porosity of 35%,46%,57%.The sample with 46%porosity has the most stability of friction coefficient.With the increase of porosity,wear rate first decreases then increases,the wear rate of sample with 46%porosity has the lowest wear rate value by 1.11×10^-7cm³/J^-1.