| Polyester fiber with high strength and low shrinkage can be widely used as a skeleton material in many EPDM products.The interfacial adhesion between them is the key factor affecting their comprehensive properties.The polarity difference between them is large,the active groups are few,the surface modulus gradient is also large,and the interface compatibility is poor.In industry,resorcinol formaldehyde silica(HRH)system and resorcinol formaldehyde latex(RFL)system are often added to EPDM Blend System and impregnated on the surface of polyester fiber,which can improve the interface adhesion effect between them.However,the release of harmful substances such as resorcinol and formaldehyde from both systems is harmful to the environment and human health.Therefore,the purpose of this paper is to improve the adhesion of the two interfaces,and at the same time to achieve the requirements of green environmental protection.GMA as the main monomer was grafted onto EPDM by melt grafting method,and EPDM-g-GMA with different grafting ratio was prepared.The interfacial compatibility between EPDM and PET was improved by introducing epoxy groups into EPDM.By optimizing the formula and process conditions to improve the grafting rate of the product,the more suitable formula and process conditions were obtained:GMA is 6 phr;?DCP is 0.065 phr;St is 3 phr;melting grafting temperature is 150 ?,reaction time is 10 min;vulcanization temperature is 160 ?.The maximum grafting ratio is 1.58%,and the maximum peel strength of EPDM polyester fiber composite is16.6N/cm.The structure of the grafted dendrimer was characterized by IR,and the melting grafting process was analyzed by torque rheometer.The interfacial compatibility between EPDM-g-GMA and PET was studied by DSC and SEM.The results showed that the interfacial compatibility between EPDM and PET was improved by adding graft copolymer.The crosslinking network system was formed by Curing Waterborne Epoxy Resin / Waterborne Epoxy Curing agent to replace the RF component in RFL system.The impregnation solution was prepared by mixing it with latex.The impregnation solution was attached to the surface of polyester fiber to improve the surface activity of polyester fiber.As an interface layer,the interfacial adhesion between EPDM rubber and polyester fiber was improved.The effects of water-borne epoxy resin,water-borne curing agent and butadiene rubber latex content,drying curing time and temperature,curing time and temperature on the peel strength and fiber surface adhesion of rubber composites were studied.The results showed that when the waterborne epoxy resin was 15wt%,the water-borne curing agent was 12wt%,the butadiene rubber latex was 30%,the drying and curing conditions were 80 ? and25 min,and the curing conditions were 155 ? and 18 min,the maximum peel strength of EPDM polyester fiber composite reached 34.7N/cm,and the amount of fiber adhesive reached 100%.SEM was used to analyze the surface morphology of polyester fiber before and after dipping solution treatment.It was proved that there was good adhesion between GDL dipping solution and polyester fiber.The results show that the tensile strength and elongation at break of polyester fiber monofilament do not change significantly after impregnation,and the composite can be used at higher temperature for a long time.The element content of the interface layer was analyzed by SEM and EDS.the vulcanizing agent and accelerator would migrate from the rubber matrix to the impregnated layer on the surface of polyester fiber,resulting in co-vulcanization.The mechanism of interface adhesion was further analyzed. |
PDF Full Text Request