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Application of Aluminum Hydroxide in Polymer Materials
2024/02/23
Application of Aluminum Hydroxide in Polymer Materials
1. Metal oxides
ATH can produce synergistic effect with many metal alumina. It has been reported in the literature that ATH can produce synergistic effect with Ni, Zn, Mn, Zr, Sb, Fe and Ti oxides. Among them, Fe, Sb oxide to improve the flame retardant efficiency and dispersion effect is more prominent.
2. Alkaline earth metal hydroxides
Alkaline earth metal hydroxides mainly refer to Mg(OH)2. The decomposition temperature of ATH is 200 ℃, and the decomposition temperature of Mg(OH)2 is 430 ℃. The combination of the two can make up for the defect that the flame retardant performance of the material is reduced due to the low decomposition temperature of ATH, and the composite flame retardant has a good flame retardant effect in the process of oxidative decomposition of the material. It is reported that low addition amount (<30%) of Mg(OH)2 can promote the flame retardant effect of ATH, especially can improve the carbonization effect of the material. When the amount of Mg(OH)2 and ATH is the same, it has the best synergistic effect in polypropylene. Through the experiment, it is found that the mixture of ATH/Mg(OH)2 can inhibit the combustion of polymer materials in a wide range with dehydration endothermic reaction in the range of 235~455 ℃.
3. Synergistic effect with organic silicide
Organic silicon compounds are not widely used in flame retardant polymer materials, but they are also effective synergists for inorganic flame retardants such as ATH. For example, the SFR-100 produced by GE company has good compatibility with resin, and its addition can greatly reduce the amount of ATH added, thus improving the mechanical properties, thermal stability and surface finish of the system. Even under the condition of high filling of ATH, the rheological properties are still very good. Another report: a silicone composite flame retardant synergist ZD, a small amount of EVA/ATH system, the oxygen index increased by 13% (to 34), and no dripping phenomenon during combustion, while maintaining good mechanical properties.
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