| As a skeleton material,polyester fiber can significantly improve the strength and dimensional stability of rubber products.However,due to the lack of active groups on the surface of polyester fiber,it is chemically inert as a whole,resulting in weak interfacial adhesion between polyester fiber and rubber matrix.Resorcinolformaldehyde-latex(RFL)dipping solution is usually used in the industry to coat polyester fibers to improve the interfacial bonding strength between polyester fibers and rubber,but the RFL dipping system are harmful to human for its toxic components,such as resorcinol and formaldehyde,so it is imminent to develop a green impregnation system.In this dissertation,two dipping systems were proposed to meet the requirements of green environmental protection,and the toxic components in the RFL system were replaced.Not only the mechanism of their adhesion was explored,but also their application research was carried out.(1)The m-cresol/formaldehyde-emulsion impregnation system was designed using less toxic m-cresol instead of resorcinol,and the effects of C/F molar ratio,CF/L mass ratio,solid content of impregnating solution and overlay amount on the interfacial bonding performance of polyester fiber/rubber composites were investigated,and it was showed that when the C/F molar ratio was 1/2 and CF/L mass ratio was 23/100,the interfacial bonding strength of the fiber/rubber composites reached the maximum,and the peel force value and H extraction force value reached 7.3N/piece and 56.8N,respectively,which increased the peel force strength by 644% compared with that of the unimpregnated treated fibers.(2)The capping water-based polyurethane-latex impregnation system was designed and developed,and the harmful resorcinol and formaldehyde in the RFL impregnation system were completely replaced.The effects of the capping agent dosage,2,2-bis(hydroxythmethyl)butyric acid(DMBA)dosage,initial R-value,final R-value and WPU/L ratio on the emulsion stability,thermomechanical stability of the adhesive film and the interfacial bonding performance of polyester fiber/rubber composite were investigated.When the dosage of DMBA was 5 wt%,initial R-value was 2.7,final R value was 1.2,and WPU/L was 23/100,the adhesion performance between impregnated coated polyester fibers and rubber matrix can reach the best,meanwhile,the peel force value and H extraction force value reached 5.47 N/piece and 61 N,respectively.The peel force strength was increased by 547% compared with the non-impregnated treated polyester fiber.(3)Based on the two developed environmentally friendly impregnation systems,the effect of PN760 dosage on the adhesion properties of PET fiber/rubber composites impregnated was investigated.The results showed that PN760 didn’t significantly affect the processing and mechanical properties of the compound,but caused delayed vulcanization due to its weak acidity.When the dosage of PN760 was 4 PHR(per hundred rubbers in weight),the peel force value and H extraction force values of the CFL-treated polyester fiber/rubber composites were 13.1 N/piece and 98 N with the increase by 77.0% and 28.9%,respectively,compared with those without PN760.And the peel force and H extraction force values of WPUL-treated polyester fiber/rubber composites were 6.9 N/piece and 96 N with the increase by 53.3% and 29.4%,respectively,compared with those without PN760.The two environmental-friendly impregnation systems were designed and developed in this dissertation to meet the requirements of green production with certain application potential. |
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