Preparation And Properties Of Inorganic Biomass/Epoxy Resin Composites

With the rapid progress of society in recent decades,various resources have been exhausted through continuous exploitation,and the environmental and ecological balance has also been destroyed due to human activities.Green environmental protection has gradually become a hot spot in chemical research,and inorganic biomass materials have low cost.The advantages of pollution and other advantages have been favored by the majority of researchers.Epoxy resin has the advantages of low density,high specific strength,excellent corrosion resistance and excellent dielectric properties,so it has a wide range of applications in production and life,but the shortcomings of epoxy resin toughness and aging resistance limit its use.Scope,so modified epoxy resin has been a research hotspot.In this paper,the egg shell is used as raw material,and the fine powder with calcium carbonate as the main component is prepared by ball milling.It is modified with stearic acid.After optimization,the optimal concentration of stearic acid(SA)modified eggshell powder is The time and temperature were 2.5%,50 min,and 85?,respectively.The structure and properties of pre-modified(UES)and modified(TES)eggshell powders were characterized by FT-IR,DSC,XRD,SEM,particle size analysis and contact angle test.FT-IR testing indicated the presence of a SA coating on the surface of the ES.DSC results demonstrate that the surface of the TES is modified by chemical bonding.XRD showed that the crystallinity and unit cell size of the modified material decreased;the contact angle increased from 42°to 169°;SEM test can clearly observe that SA modification greatly reduces the agglomeration properties of ES and makes it The dispersion in the material is improved.The inorganic biomass/epoxy resin composites were prepared by using triethylenetetramine(TETA)as curing agent,and the curing kinetics of TES and UES under different additions were studied by DSC non-isothermal method.The extrapolation method was used to select the curing temperature of each system.The Kissinger method was used to determine the activation energy of the curing reaction of each system.The FWO method was used to study the change of activation energy under different conversion rates.The Malek method was used to obtain the kinetic equation.The results showed that:Before and after the addition of eggshell particles,the curing process of epoxy resin did not change significantly.The activation energy of each system was between 45-55 kJ/mol.SB(m,n)model can simulate each non-isothermal curing reaction.The method of determining the curing process is curing at 42? for 3 h,and curing at 90? for 2 h.The mechanical properties and thermodynamic properties of inorganic biomass/epoxy composites were characterized by universal material testing machine,thermogravimetric analyzer and dynamic thermomechanical analyzer.Tensile testing showed that the highest elongation value of the composite filled with 15 wt%TES was(11.31±0.18%),which was 22%higher than when it was not added.The TGA test showed that the thermal stability of the material after the addition of TES was improved.When the TES was added at 20wt%,the T5%,T10%and T20%,of the material were increased by 32,26,31? compared with the pure epoxy resin,and the material was The storage modulus increased by 41%compared with the unadded,and the crosslink density increased from 1.29×10-3 to 2.71×10-3 mol/cm3.The loss factors tan? and Tg of the material also decreased.Finally,epoxy resin composites were prepared by using jute fiber and TES.The wear results of the composites confirmed that the addition of reinforcing materials improved the wear resistance.Thermal analysis showed that the addition of hemp fiber did not contribute to the improvement of thermal stability,while eggshell particles showed the greatest effect in improving the stability of the initial mass loss.