Study On Modification Of ACS Resin By Fire Retardant

ACS resin is a thermoplastic polymer, which is synthesized through the copolymerization of acrylonitrile(AN), chlorinated polyethylene (CPE) and styrene (St). It is developed to overcome the weather resisting deficiency of ABS resin. Based on the synthesis of ACS resin, ACS/Sb₂O₃ composite resin is prepared by in-situ suspension polymerization and melting blend method. Wherein the surface modification of Sb₂O₃, the effect of Sb₂O₃ on particle characteristic of ACS resin, the mechanical properties and flame retardancy of ACS/Sb₂O₃ composite resin were studied. At the same time, the comparison of the performances of the three methods was also studied.Through studying on the surface modification of Sb₂O₃, titanate coupling agent NDZ-101 had the best modifying effect and the proper addition amount of couping agent is 1 .Owt%.After researching on the in-situ suspension polymerization of ACS/Sb₂O₃ composite resin, conclusions were gained as follows: when the agitation speed is 450rpm, the smallest particle size and the least amount of fine particles could be got; the conversion rate declined with the increase of the agitation speed; the addition amount of Sb₂O₃ hardly effected the size distribution of the particle, but the amount of fine particles increased as the addition amount of Sb₂O₃ increased.The TEM photos of ACS/Sb₂O₃ composite particle showed that partial agglomeration of Sb₂O₃ occurred in the resin. But it can be concluded that Sb₂O₃ particles almost didn't agglomerated during the polymerization through the comparison between the particle size of Sb₂O₃ particles and agglomeration size.The impact strength of the ACS/Sb₂O₃ composites decreased with the increase of the amount of Sb₂O₃ added. However, the extensibility and flexibility of the composites had a peak value when the mass percent of Sb₂O₃ reached 3wt%. In addition, the amount of Sb₂O₃ added had no effect on the rigidity of the composites.Via studying on the mechanical properties of ACS/Sb₂O₃ composites through direct in-situ polymerization of ACS/Sb₂O₃, in-situ polymerization of AS/Sb₂O₃ and then blending with ACS resin, direct blend of ACS resin and Sb₂O₃, the properties of the first kind of ACS/Sb₂O₃ composites were better than that of the others.The heat distortion temperature and the vicat softening temperature of ACS/Sb₂O₃ composites via in-situ suspension polymerization reached the maximum when the addition amount of Sb₂O₃ reached 3wt%. As the addition amount of Sb₂O₃ increased, the maximum weight loss ratio decreased. Meanwhile, the incarbonization ratio of ACS/Sb₂O₃ composites in Oxygen was higher than in Nitrogen.The addition of Sb₂O₃ obviously improved the LOI of ACS/Sb₂O₃ composites because of the synergism of halogen and antimony. As the dispersion of Sb₂O₃ via in-situ polymerization was better than blending, the fire retardancy of the former showed better performance than that of latter.