Flame retardant PC / ABS alloy multilayer co extruded sheet production line

日期:2021/6/19 8:37:09 / 閱讀: / 來源:本站

Flame retardant PC / ABS alloy multilayer co extruded sheet production line
PC has a certain flame retardancy (oi-25%). After adding ABS, the flame retardancy decreases. It is necessary to modify PC / ABS to meet the requirements of flame retardancy in some application fields. There are several types of flame retardants commonly used in PC / ABS alloy: multilayer co extruded sheet production line www.www.dressup9x.com
Phosphorus containing flame retardants commonly used in PC / ABS alloys are coated red phosphorus and organophosphorus compounds. Red phosphorus is a phosphorus based flame retardant with excellent flame retardancy because of its high phosphorus content, but it is not suitable for light color products because of its dark color. Multi layer co extrusion sheet production line www.www.dressup9x.com
There are two kinds of organophosphorus compounds: low molecular organophosphorus compounds and high molecular organophosphorus compounds. Triphenyl phosphate (TPP) is the representative of low molecular organophosphorus compounds. TPP contains 9.5% phosphorus and is relatively volatile when melted at about 50 ℃. When 13.5% TPP is added into PC / ABS alloy, the flame retardancy of the alloy reaches UL94 V-0 (1.6 mm) and UL94 5V (3.2 mm). Increasing the content of ABS or decreasing the content of TPP can reduce the flame retardancy of the alloy. TPP is suitable for flame retardant of PC / ABS alloy with low ABS content. TPP has plasticizing effect on PC / ABS, so the hot deformation temperature of TPP flame retardant PC / ABS alloy decreases. Polymer organophosphorus compounds are mostly condensed phosphates with high molecular weight, and resorcinol Di condensed phosphates (RDP) and bisphenol a diphenyl phosphates (bpa-dp) are widely used at present. The flame retardancy of PC / ABS alloy is related to the content of flame retardant, and the relationship between the content of flame retardant and the ratio of UL94V-0 PC / ABS alloy. It can be seen that the amount of RDP required for PC / ABS alloy to reach UL94 V-0 increases with the increase of ABS content. Bisphenol-A condensed phosphate has good thermal stability, does not cause the increase of alloy viscosity during processing, and is renewable. Multi layer co extrusion sheet production line www.www.dressup9x.com
Halogen containing flame retardants brominated aromatic compounds have high thermal stability and are excellent flame retardants for PC / ABS ALLOYS. Commonly used are: decabromodiphenyl ether, decabromobisphenol a, tetrabromobisphenol A, tetrabromodiphenyloxybenzene, 1,2-bis (tribromophenyloxy) ethane, 1,2-bis (tetrabromophthalamide) ethane, tetrabromobisphenol A carbonate oligomer, brominated epoxy resin oligomer, brominated phenylene glycol, etc. The oxygen index of the CaCO: filled PC / ABS (80 / 20) alloy is 28.5 when 15 phr decarbyl ether is added. In addition to its flame retardant effect, decarboxylate also has obvious expected application: the content of decarboxylate is in the range of 15 phr, and the content of brominated PC required by the impact energy of the alloy is 12% higher than that of RDP. Multi layer co extrusion sheet production line www.www.dressup9x.com
Phosphorus halogen flame retardant phosphorus and bromine have synergistic effect of flame retardancy. Phosphorus bromine flame retardant has super strong flame retardancy in PC / ABS alloy. The typical product is tris (24 dibromophenyl) phosphate, trade mark is kroitex pb-460, containing about 0% bromine and 4% phosphorus. It is a white solid, melting point is 110, not easy to volatilize, excellent heat resistance, and does not change color when heated at 10 ℃ for 30 min in air, The temperature of 1% and 5% weight loss is 280 ℃ and 310 ℃ respectively. Pb-460 has good dispersion in PC / ABS alloy, and its flame retardancy is better than TPP, Aohua polyethyleneglycol, bis (tribromophenoxy) ethane and brominated carbonate oligomer. Table 5-33 shows the performance comparison of flame retardant TPP and pb-460 flame retardant PC / ABS alloy. It can be seen from table 5-33 that 6% pb46 is added to PC / ABS (3 / 1) alloy. The flame retardancy is ul4v-0 (1.6mm) / 5V. Multi layer co extrusion sheet production line www.www.dressup9x.com
(3.2mm). The impact strength, bending strength and hot deformation temperature of pb-460 flame retardant PC / ABS alloy are higher than those of TPP flame retardant PC / ABS alloy. Pb-460 can be used in PC / ABS alloy with high ABS content due to its high flame retardant effect. If the PC / ABS Blend Ratio is 1:1 and 14% pb-460 is added, the grade of UL94 V-0 (1.6 mm) / 5V (3.2 mm) can still be reached. Multi layer co extrusion sheet production line www.www.dressup9x.com
Non phosphorus and non halogen flame retardants most of them are harmful to human health and the environment in the process of production, processing and use. Therefore, non phosphorus and non halogen flame retardant plastics are the current research and future development direction of plastic flame retardant technology. The non phosphorus and non halogen flame retardants that can be used in PC / ABS alloy are polysiloxane copolymer, organosiloxane, methylphenyl silicone resin, etc. Organosilicon polymer is a kind of semi organic polymer with special structure and excellent properties. Its main chain is inorganic structure of Si-O bond, and its side group is organic group. It has the dual properties of inorganic compound and organic polymer. As a kind of flame retardant, it not only endows the substrate with good flame retardancy and high temperature oxidation resistance, but also is environmentally friendly, low toxic or non-toxic. It is a kind of "green" flame retardant with great development potential. Using phenylmethoxysilane and methylmethoxysilane as raw materials, silicone flame retardant was prepared by hydrolysis condensation method. Through orthogonal experimental analysis of reaction time, reaction temperature, amount of catalyst and end capping time, the preparation conditions of silicone flame retardant were optimized, and the flame retardant silicone was prepared, which had good thermal stability (at 800 ℃ in N2 atmosphere, The oxygen index of PC can be increased from 26 to 34 by adding 5% of PC. Multi layer co extrusion sheet production line www.www.dressup9x.com

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