Study On Performance Of Biological And Environmental Additive On PVC Wood-plastic Composites

In order to improve the usability of wood-plastic composites(WPC),the customary preparation process of WPC is usually added some chemical agents,such as compatibility agent,foaming agent and flame retardant and so on.However,these chemical additives are partly harmful to the ecological environment.So it has important significance to improve the environmental conservation of preparation and use of WPC by studying the influence of biological and environmental additive on PVC based WPC.This paper discussed the impact of bamboo charcoal(BC)and chitosan(CS)on interface compatibility,mechanical,thermal,water absorption and functional groups of wood flour(WF)/PVC WPC,studied the performance of WF/PVC WPC which modified with different addition and mesh of BC,discussed the impact of inorganic foaming agent(BF210)and the extrusion temperature on PVC foamed WPC,analyzed the flame retardant effect of spell powder and discussed the impact of addition and mesh of spell powder on the performance of flame retardant,mechanical,thermal,water absorption.The main conclusions can be drawn as follows:(1)The analysis of BC and CS modified WF/PVC WPC showed that:BC and CS could improve the compatibility of wood flour and PVC and the mechanical properties of composites,the BC&CS-WPC modified by the compound of BC and CS had the better interface compatibility,it had maximum tensile strength,impact strength,flexural strength and modulus which were 19.74MPa,6.11KJ/m2,39.27MPa and 4.53GPa and increased 14.63%,28.76%,10.98%and 9.70%compared to untreated WPC;BC could improve the thermal property effectively;BC&CS-WPC had better thermal stability,it had more residual mass after thermal decomposition;BC&CS-WPC had less number of-OH,and its water absorption for 24h was minimum.(2)The analysis of different mass ratio(1:2,1:1 and 2:1)of BC and CS modified WF/PVC WPC showed that:When the mass ratio of BC and CS was1:1,the BC1.5-WF/PVC had maximum tensile strength,impact strength,flexural strength and modulus which increased 14.63%,28.76%,10.98%and 9.70%compared to WF/PVC;BC1.5-WF/PVC had the best thermal stability and interfacial bonding situation,and its water absorption for 24h was minimum.(3)The analysis of WF/PVC WPC filled with different addition(1,3,5,7phr)of BC showed that:When the addition of BC was 5phr,the composite BC-5 had maximum tensile strength,impact strength,flexural strength and modulus which were 19.61MPa,5.84KJ/m2,40.09MPa and 4.45GPa and increased 12.32%,22.40%,10.55%and 11.39%compared to BC-1;BC-5 had greatest thermal stability and interfacial bonding situation,the number of-OH in it was minimum,it had the best water absorbency.(4)The analysis of WF/PVC WPC filled with different particle size(100,300,800,1500 mesh)of BC showed that:When the particle size of BC was 100 mesh,the composite BC-100 had maximum tensile strength,impact strength,flexural strength and modulus which were 19.75MPa,5.87KJ/m2,39.14MPa and 4.55GPa and increased 3.9%,12.9%,6.4%and 13.8%compared to BC-1500;the initial decomposition temperature of the BC-100 was higher,and BC-100 had more residual mass,better thermal stability and interfacial bonding situation,therefore,WF and PVC could combine closely and BC-100 had better water absorbency.(5)The analysis of WF/PVC WPC with different addition(0,1,2,3,4phr)of inorganic foaming agent BF210 showed that:Foaming agent could generate cell structure in the composites which could increase the water absorbency and impact strength of WPC,decrease the tensile strength,flexural strength and modulus;when the content of BF210 was 2phr,the composite BF-2 had greatest impact strength which was 6.28KJ/m2;BF-2 had the best thermal stability and foaming quality,better microstructure and minimum apparent density.(6)The analysis of WF/PVC WPC prepared under different temperature of mold area(160,165,170,175?)showed that:The higher of extrusion temperature could impact the formation of bubble holes and their structure,which would lead to the higher of water absorption and impact strength of WPC,decrease the tensile strength,flexural strength and modulus,BF-170 had the largest impact strength which was 6.52 KJ/m2;BF-170 had the best foaming quality and interfacial bonding situation,less apparent density and water absorbency;the impact of extrusion temperature on thermal stability of foamed WPC was little.(7)The analysis of PVC based WPC filled with different content(2,4,6,8phr)of spell powder showed that:When the addition of spell powder was 6phr,the composite SP-6 had the highest limited oxygen index(LOI),which was 30.7%;and SP-6 had the maximum tensile strength,impact strength,flexural strength and modulus which were 22.02MPa,5.99KJ/m2,42.58MPa and 4.69GPa,and increased 11.52%,1.97%,8.80%and 3.20%compared to SP-0;SP-6 had the best thermal stability and its residual mass was 34.62%which was largest;the number of-OH in SP-6 was less,the water absorption for 24h was minimum of SP-6.(8)The analysis of PVC based WPC filled with different particle size(200,400 and 600mesh)of spell powder showed that:When the WPC filled spell powder in 600mesh,it had the highest LOI,which was 32%;SP-600 had the maximum tensile strength,impact strength,flexural strength and modulus which were 28.67MPa,6.21KJ/m2,46.0MPa and 4.91GPa,and increased 30.20%,3.74%,8.02%and 4.57%compared to SP-200;SP-600 had better thermal stability and interfacial bonding situation and its water absorption for 24h was minimum;there was effect on the functional group in WPC since the particle size of spell powder changed.