| Epoxy adhesives are widely utilized in automobile industry,civil engineering,sports equipment and other fields by virtue of their good adhesion properties,excellent mechanical properties as well as excellent electrical properties.Researchers have explored various epoxy adhesives with different performances based on the different application requirements.In this paper,according to the requirements of large storage battery and transformer,the amine-terminated butadiene acrylonitrile rubber(ATBN×16)toughened epoxy adhesives with high strength and toughness were prepared,which were to meet the application conditions of acid resistance and high toughness.And the adhesion properties of epoxy adhesives were improved by virtue of surface treatment of styrene butadiene rubber(SBR).The research is summarized as follows:1.The effect of toughening on the acid resistance of epoxy adhesive:This paper mainly studies the acid resistance and tensile properties of the epoxy adhesives toughened with polysulfide rubber of ATBN×16.The effects of the types such as epoxy resin,curing agent,toughening agent and the dosage on acid resistance and tensile properties of epoxy adhesive were discussed.The results showed that the ATBN×16 toughened and alicyclic amine R300 cured epoxy adhesive had better acid resistance and tensile properties simultaneously.With the dosage of ATBN×16 increased from Ophr to 50phr,the acid resistance of the epoxy adhesives changed little,while the ultimate elongation increased from 4.0%to 20%.When the composition of epoxy resin 0164/ATBN×16/R300 was 100/50/50,the comprehensive properties of the epoxy adhesive were the best.After soaked in 40%sulfuric acid at 60℃ for 1 day,the tensile strength and ultimate elongation of the sample also reached to 28.8 MPa and 20.0%respectively,and the acid absorption ratio was only 0.8%,The epoxy adhesive effectively meet the application conditions of the large storage battery.2.The research of toughening on epoxy adhesive used for transformer:The traditional epoxy anhydride adhesives had poor toughness when it was used for transformer.In this paper,epoxy anhydride adhesives were toughened by ATBN×16 to improve the toughness,and hope to keep the tensile strength of traditional epoxy anhydride adhesives.The results showed that the ultimate elongation of 25phr ATBN×16 toughened epoxy anhydride adhesives increased from 4.7%to 9.7%,and the impact strength increased from 20.4KJ/m2 to 33.1KJ/m2,while the tensile strength decreased from 26.3MPa to 16.5MPa.Then ATBN×16 toughened epoxy aromatic amine adhesives were used to replace traditional epoxy anhydride adhesive.Through formula optimization,when the composition of 0164/ATBN×16/diethyltoluenediamine E300/silica was 100/70/30/213,the tensile strength and ultimate elongation of the sample reached to 24.2 MPa and 10.9%respectively,and the impact strength was 36.1 KJ/m2.The results showed that when the dosage of silica remain unchanged,tensile strength of toughened epoxy aromatic amine adhesives was equivalent to that of traditional epoxy anhydride adhesive,and its toughness was equivalent to that of toughened epoxy anhydride adhesive.3.The effect of surface treatment on the adhesive properties of SBR:The SBR had low polarity which led to low adhesion properties of epoxy adhesive.In this paper,the surface of SBR was modified by virtue of chlorination of tert-butyl hypochlorite(The surface of SBR was brushed by calico dipping of tert-butyl hypochlorite solution at certain concentrations,with some reaction time of air-curing at room temperature).The effect of solvent,content of tert-butyl hypochlorite and reaction time on surface modification of SBR were studied.The results revealed that the effect of ethyl acetate,xylene,petroleum ether and other solvents on surface modification of SBR was negligible.When the content of tert-butyl hypochlorite was 2wt%or more than 2wt%and reaction time of air-curing was 60min,the modification effect was better.And the contact angle of SBR decreased from 112.7° to 74.4°,while the shear strength increased form 3.66MPa to 8.94MPa. |
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