Influence of biomass carbon source on flame retardancy and bonding properties of EPDM
In order to improve the flame retardancy and bonding properties of ethylene propylene diene monomer rubber(EPDM),in this paper,EPDM was used as the matrix,appropriate amounts of ammonium polyphosphate and melamine were added,natural products such as glucose,dextrin,cyclodextrin,and starch were used as carbon sources,flame retardant EPDM adhesive was then prepared.The influence of various biomass carbon source dosages on the mechanical properties,flame retardancy and bonding properties of composite materials was investigated.The research results showed that,(1)Glucose,dextrin,cyclodextrin,and starch were used as carbon sources,combined with ammonium polyphosphate and melamine,the carbonization effect of EPDM could be significantly improved.To further improve the flame retardancy,it was necessary to add substances with significant expansion effects.(2)Glucose,dextrin,cyclodextrin,and starch were all rich in hydroxyl groups and had high polarity,which could significantly improve the bonding properties of EPDM.However,the poor compatibility with EPDM led to a significant decrease in the tensile strength of the rubber body.To further improve bonding properties,finding suitable compatibilizers was the main breakthrough.(3)The amount of ammonium polyphosphate was fixed as 25 parts.Through comparison of oxygen index,tensile properties and bonding properties,cyclodextrin had the best comprehensive performance,and the optimal dosage was around 25 parts.Dextrin followed,with an optimal dosage of around 35 parts.The optimal dosage of glucose and starch was around 15 parts.However,the melting point of glucose was too low and the sulfurization temperature was relatively high,making it unsuitable as a flame retardant carbon source.And dextrin,cyclodextrin,and starch all had good application prospects.
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