人造板用耐搅拌乳化蜡的研制

Preparation of emulsified wax resistant to agitation for wood-based panels

采用58#半精炼蜡为原料,单硬脂酸甘油酯、平平加O-20、PEG-100硬脂酸酯三者复配做主要乳化剂,制备出耐搅拌的乳化蜡。结果表明,在复合乳化剂的HLB值为10.8,乳化剂用量为石蜡量的15%,乳化温度为80℃,乳化30 min时,制备的乳化蜡黏度为14.7 s(涂-4杯黏度法),粒径小于50 nm,Zeta电位为180 mV,固含量为43.7%。流变性能表征结果表明该乳液为假塑性流体。该乳液于1500 r/min搅拌4 h后,黏度为12.4 s,黏度没有变大,固含量为41.2%,静置稳定性和离心稳定性好,不分层,分散性为一级,具有良好流动性的时间不低于7 d。

A type of agitation-resistant emulsified wax was prepared where the 58#semi-refined wax was used as raw material and the mixture of glycerin monostearate,peregal O-20 and PEG-100 stearate was used as the main emulsifier.The results showed that the optimized conditions for preparing the paraffin emulsion were as follows:The HLB value of the composite emulsifier was 10.8;the amount of the emulsifier was 15%of paraffin wax;the emulsifying temperature was 80℃;the emulsifying time was 30 min.The viscosity of the emulsified wax thus obtained was 14.7 s(No.4 viscosity flow cup);the particle size was less than 50 nm;Zeta potential was 180 mV;the solid content was 43.7%.Rheological properties showed that the emulsion was pseudoplastic fluid.When the emulsion was stirred at 1500 r/min for 4 h,the emulsion exhibited a viscosity of 12.4 s(i.e.,the viscosity was not increased),a solid content of 41.2%,good static and centrifugal stabilities,no phase separation,and a dispersibility of grade one,and its good fluidity was maintained not less than 7 days.