Wollastonite powder for flame-retardant silicone rubber antimony trioxide substitute

Ultrafine ultra pure calcium silicate can replace antimony trioxide in equal amount, greatly reducing the cost. It can be replaced in equal amount, without affecting the flame retardancy and better processing performance. It is recommended to add 10% of it to the flame retardant silicone rubber of the bromine antimony flame retardant system. Calcium silicate is more environmentally friendly than antimony trioxide and fully complies with European Rohs and REACH environmental standards. Samples can be sent to test the effect.

Wollastonite/antimony trioxide (Ca SiO3/Sb2O3) composite particles were prepared from antimony trichloride and acicular wollastonite by hydrolysis reaction. The effects of coating amount, reaction temperature and surfactant on the coating effect were studied. SEM, XRD, FT-IR and XPS were used to characterize the cross-section morphology of the composite, the phase and morphology of Sb2O3 and its coating behavior on the surface of wollastonite. The flame retardancy of polyamide 6 (PA6) was studied by using Ca Si O3/Sb2O3 composite particles instead of traditional antimony trioxide (Sb2O3) and decabromodiphenylethane (DBDPE), and the dispersion of Ca Si O3/Sb2O3 instead of Sb2O3, as well as its influence on the flame retardancy and mechanical properties of the material were studied. The experimental results show that antimony trioxide can be coated on the surface of wollastonite in the form of ultrafine particles by controlling the coating amount of antimony trioxide to 51%, the reaction temperature to 40 ℃, and the addition amount of surfactant PEG20000 to 1.0%. Ca SiO3/Sb2O3 has good dispersion in PA6. The composites obtained by replacing Sb2O3 with CaSiO3/Sb2O3 have good flame retardancy, smoke suppression performance, vertical combustion reaches V-0 level, and mechanical properties are significantly improved.