Synthesis And Application Of Flame Retardant ACS Resin

ACS resin is a macromolecular material, which is synthesized through the copolymerization of chloridized polyethylene (CPE), styrene (St) and acrylonitrile (AN). It is developed to overcome the performances deficiency of ABS resin. Aiming at developing of the domestic ACS resin with good performances, rubber-like CPE and suspension swelling-graft copolymerization were chosen, and ACS resin was synthesized in 5-litre stainless autoclave. Wherein the action mechanism of complex dispersing system, the control factors of the structure and particle characteristics and the effects of the structure on the properties of ACS resin were studied. Based on the synthesis of ACS resin with excellent performances, the flame retardant property of ACS resin was modified. Compared to flame retardant ABS resin, flame retardant ACS resin with excellent performances was synthesized.Through studying the particle diameter of hydroxyapatite, the optimum condition to synthesize hydroxyapatite was gained as follows: the concentrations of CaCl₂ and Na₃PO₄ were both 0.015mol/L, the reaction temperature 30°C, the agitation speed 300rpm; adding speed approximate 8ml/min, the ageing time 2 hours, and Na₃PO₄ should be added to CaCl₂.When ACS resin was synthesized in high temperature, it showed that the agglomeration occurred in the polymerization when PVA or HAP was used individually. Copolymer particles with regular shape were prepared by using of PVA/HAP composite suspension stabilizers with mass ratio of 1:1.8. As the mass fraction of the composite suspension stabilizers increased, more AN^St copolymer fine particles were formed, and the average particle size of ACS resin became smaller.The effects of the content of CPE and swelling temperature on the graft ratio and graft efficiency of ACS resin were studied. As the content of CPE increased, the graft ratio of ACS resin debased, but the graft efficiency of ACS resin enhanced. As the swelling temperature increased, the graft ratio and graft efficiency of ACS resin both enhanced.At the same time, the effects of the content of CPE, swelling temperature and agitation speed on the particle characteristics of ACS resin were studied. As the content ofCPE increased, the average particle size of ACS resin became smaller and became a little larger at last. As the swelling temperature increased, the average particle size of ACS resin became larger, and the content of AS copolymer fine particles decreased firstly and then increased. The average particle size of ACS resin and the content of AS copolymer fine particles decreased with agitation speed firstly and increased after a critical agitation speed. The average particle size of ACS resin was the lowest when the agitation speed was approximate 500rpm.The effects of the content of CPE and the graft ratio of ACS resin on the impact strength, tensile and flexural property, rigidity, 01 and Vicat of ACS resin were studied. As the content of CPE increased, the impact stress enhanced and the others all decreased. As the graft ratio of ACS resin increased, the 01 of ACS resin debased, the tensile and flexural properties of ACS resin were both basic stable, and the rigidity and Vicat of ACS resin both enhanced. The impact strength of ACS resin increased with graft ratio firstly and decreased after a peak.The effects of the content of CPE and Sb₂O₃ on the performances of ACS resin were studied. It showed that ACS resin had the natural flame retardant property. When the content of Sb₂O₃ was about 10%, the integrative performance of ACS resin was the best. Through compared to ABS resin with the same flame retardant property, the flame retardant ACS resin's most performances were better than the flame retardant ABS resin. It showed that ACS resin could take the place of ABS resin in the use of flame retardant material.