| Chlorinated Polyethylene (CM) have had more and more applications in the cableindustry due to its superior performance and relatively lo w price. As the products of cableindustry, more excellent flame retardant and electrical properties are required. In the processof rubber products, various additives are usually added to meet the performance requirement,the current direction of development is focused on environmentally friendly, versatile,efficient additive. Similar-sericite is an inorganic filler developed by Huafeng. With moreexcellent processing performance, a certain reinforcing properties and zero-carbonenvironmental protection features and so on, it has good prospects. There still have not anyrelevant analysis and application on the fire-retardant performance and electrical performance,this paper studied the basic application of similar-sericite in CM, we firstly studied the effectof similar-sericite on physical and mechanical property of CM, then studied the effect onflame retardant and electrical property and emphasized on analyzing the flame retardantmechanism of similar-sericite.Firstly, this paper studied the effect of similar-sericite on physical and mechanicalperformance of CM. Experimental results showed that with the increase in the amount ofsimilar-sericite, scorch time slightly delayed, curing time prolonged, tensile strength andelongation at break first increased and then decreased, tear strength and modulus increased.When60phr similar-sericite were added, the tensile strength of vulcanizate was18.04MPa,the elongation at break was587.88%, the tear strength was33.46kN m-1. Similar-sericiteexhibited certain reinforcing properties. After modified by coupling agent, the mechnicalproperties of CM vulcanizate improved. The tear strength of similar-sericite modified byKH560reached to43.56kN m-1which increased10.10kN m-1compared to theunmodified one. The tensile strength of similar-sericite modified by KH570reached to20.21Mpa which increased2.7Mpa compared to the unmodified one.Similar-sericite hadexcellent mechanical performance filled in CM.we studied the effect of similar-sericite flame retardant and electrical properties of CM. The experimental results showed that with the increase of the amount of similar-sericite, thevulcanized rubber′s initial decomposition temperature increased, the peak temperature of thefirst stage weight loss decreased, the second peak increased, the residual mass of900℃incresed, CM vulcanizates oxygen index, vertical combustion level also increased, while themaximum rate of heat release and smoke production rate SPR pHRR reduced,the volumeresistivity decreased. When the content of similar-sericite was less than40phr, the oxygen wasslightly greater more than magnesium hydroxide.When the content was more than40phr,theoxygen was less than magnesium hydroxide, but higher than talc. The adiition of couplingagent had little effect on flame retardant, but made the volume resistivity increased, reducedthe rate of change on volume resistivity after immersion in water.In order to improve the efficiency of fire-retardant property, we studied the mixed usebetween similar-sericite and different flame retardants. The study found that the addition offlame retardants reduced the physical and mechanical properties, especially intumescent flameretardant IFR had a larger decline. The addition of Flame retardants had no big effects onelectrical insulating properties. Different types of flame retardants had different thermalstability, fire performance was also different. Adding Sb2O3, ZnbO3, the flame retardantproperties got better; adding other types of flame retardants, the flame retardant performancedecreased. After adding10phr of Sb2O3, its oxygen index was up to30.5.Finally, this paper also discussed the actual application of using similar-sericite in CMwire cable rubber material. Research showed that adding100phr similar-sericite,2phr KH570and3phr Sb2O3, the overall performance was better than factory recipes, as well asenvironmental and economic. Satisfied GB5013.2-1997standards and requirement. |
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