Preparation Of Camphor Acid Epoxy Resin And Its Application In Textile Composites

Composite material,as a kind of material with two or more properties,plays an important role in human daily life.Epoxy resin is widely used in the preparation of composite materials because of its excellent excellent mechanical properties,chemical resistance,dimensional stability and other advantages,so it applied in aerospace,automobile industry,rail transit and other fields.However,the traditional epoxy resin mainly comes from petroleum,and the extensive use of petroleum-based products brings a series of environmental problems.With the rapid consumption of petroleum resources and the increasingly serious environmental problems,people urgently need to develop green and environmentally-friendly renewable resources.All these prompt people to develop new environment-friendly polymers to replace petroleum-based products.There are a lot of bio-based renewable resources stored in nature.Developing and utilizing bio-based resources can not only meet people's demand for polymer materials,but also reduce petroleum resources and protect the environment.Therefore,it is of great significance to develop and utilize renewable biological resources to prepare polymer materials for sustainable development.In this paper,diglycidyl ester of camphoric acid(DGECA)was prepared from bio-based camphoric acid,and its synthesis process,curing properties and application in composites as a matrix were studied.The main contents are as follows:(1)DGECA was designed and synthesized,and taking epoxy value of DGECA as index,the optimum synthesis process was screened by single factor analysis.The effects of raw material ratio,ring-open temperature and time,ring-closed temperature and time on the product were mainly studied.Consequently,the optimum synthesis process was as follows: material ratio 1:16(molar ratio),ring opening temperature75?,ring opening time 20 min,and cooling to 50? for ring closing of 6h.The viscosity,ultraviolet absorption and thermal stability of the synthesized DGECA were tested,its viscosity is only 1.35 Pa·s,and the ultraviolet absorption is only 0.038 A.At the same time,under 160?,there is basically no loss in mass;(2)With methylhexahydrophthalic anhydride(MHHPA)as curing agent,DGECA was cured under the action of tertiary amine accelerator,and its curing behavior and mechanical properties,thermal stability,thermo-mechanical properties,ultraviolet resistance and other properties of the cured samples were studied.In order to evaluate its performance,commercial bisphenol A diglycidyl ether(DGEBA)was cured under the same conditions;The results show that the DGECA is equivalent to commercial DGEBA in all properties(flexural strength,impact strength,etc.),and even better than commercial DGEBA;(3)Adding DGECA as modifier(diluent)into DGEBA,and testing various properties of the modified DGEBA resin;The results show that DGECA has a good modification effect on DGEBA,which can obviously reduce the viscosity of DGEBA and improve its flexural strength and impact strength;(4)The composites were prepared with DGECA as matrix and ramie fabric as reinforcement,and the effects of molding process and mixing ratio of resin and fabric on its mechanical properties were studied;meanwhile,the effect of mixing ratio of resin and fabric on its mechanical properties,thermal stability and water absorption of composites under the same molding process conditions were studied.The results show that with the increase of DGECA content,the thermal stability of the composites increases gradually,the flexural strength and tensile strength of the composites decrease gradually,and the water absorption performance decreases gradually.