Preparation And Performance Of Xuan-paper Waste Residue And Red Mud Mineral Composites

Xuan-paper,as one of the four treasures of study in China,is the national geographical indication protection product,which has played an irreplaceable role in the inheritance of Chinese painting and calligraphy.However,a large amount of waste residue is generated during the production of Xuan-paper.Due to the luck of research and utilization of Xuan-paper waste residue（XPWR）,accumulated XPWR was caused pollution of the environment and waste of resources.In this paper,based on the investigation of XPWR,a series of composites were prepared and the modification mechanism were studied.Among them,waste polyethylene（WPE）and polyvinyl chloride（PVC）were matrix,while XPWR and red mud（RM）were fillers in compositesThe characteristics of XPWR was analyzed,it was found that there were about 63 wt%of organic fibers and 27 wt%of mineral particles in XPWR.Based on the results,the XPWR/WPE composites were prepared by XPWR and WPE.It was found that the addition of XPWR improved the mechanical properties of composites.The tensile strength and bending strength of composites reached 20.91MPa and 78.51MPa,which improved 68.6%and 559.2%compared without XPWR.The addition of XPWR changed the crystallinity and improved the thermal stability of composite and lead to the water absorption and thermal conductivity of composites increased.Based on the research,XPWR can be used as a reinforcing filler.The RM/WPE composites were prepared in this paper.During the research,it was found that the content of RM affected the tensile strength and bending strength of composites.When the content of RM was 40wt%,the mechanical properties of composites was pretty good.Its tensile strength and bending strength reached 18.93 MPa and 50.19 MPa,which improved 52.7%and321.4%compared without RM.At the same time,the addition of RM changed the crystallinity and improved the thermal stability of composites,also reduced the water absorption and thermal conductivity of composites.The water absorption of RM/WPE composites all below 0.6%at 7days and the lowest thermal conductivity was 0.163 W/（m·K）.In order to explore the synergy of XPWR and RM on the composites,the XPWR/RM/WPE composites were prepared.The results showed that XPWR didn’t improve the tensile strength significantly but improved the bending strength effectively.As the amount of XPWR added was40 wt%,the bending strength of composites was 71.81 MPa,which improved 43.08%compared without XPWR.In addition,XPWR changed the crystallinity and improved the thermal stability of composites,reduced the thermal conductivity to 0.056 W/（m·K）.Meanwhile,XPWR lead to the water absorption of composites increased.But the highest value only was 1.68%at 7^th day,which didn’t affect the use of composites.In order to explore the application of XPWR and RM modified other mineral composites,the polyvinyl chloride（PVC）was used as matrix,while XPWR and RM were used as fillers,the XPWR/RM/PVC composites were prepared with different addition of XPWR.The results showed that the addition of XPWR reduced the thermal conductivity,density and costs of composites.