Effect of Carboxymethyl Chitosan Microencapsulated Magnesium Hydroxide on the Mechanical Properties and Smoke Suppression of Polyvinyl Chloride
Polyvinyl chloride(PVC)ignites readily in air and releases a large amount of toxic fumes.Although magnesium hydroxide(MH)is a good flame retardant,it has poor compatibility with the PVC matrix,which reduces the mechanical properties of PVC composites.In this paper,the ionic bond formation between carboxymethyl(-CH2COOH)and hydroxyl(-OH)groups in carboxymethyl chitosan(CMCS)and magnesium hydroxide(MH)was used to prepare the carboxymethyl chitosan-coated magnesium hydroxide microencapsulated flame retardant material,CMCS@MH(C@M),and the PVC composite film material CMCS@MH/PVC(C@M/P)was prepared by incorporating C@M into the PVC matrix.The coating properties of C@M,mechanical properties,smoke inhibition properties and thermal stability of C@M/P were characterized by FTIR,XRD,et al.The experimental results show that the tensile strength of 5％C@M/P is 20.9MPa and the elongation at break is 304％.The maximum specific optical density of 5％C@M/P is reduced to 6.481,and the time to reach this value is 106s.Among all samples,5％C@M/P exhibited the highest char yield at 800 ℃,approximately 3.304％.The results of this study can be used for the design and development of microencapsulated magnesium hydroxide flame retardant,which in turn can provide a reference for the development of PVC film materials with high flame retardant properties by solving the chlorine balance in the comprehensive utilisation process of salt lake resources.
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维普
