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强化板的耐磨性能通常由耐磨表层Al2O3颗粒决定,Al2O3颗粒在水相和有机树脂中分散性差,容易团聚沉降。表面改性可有效地增进两相界面间亲和性,提高有机树脂对无机粒子的润湿能力,改善无机颗粒的分散。选用偶联剂KH-550对Al2O3颗粒进行表面改性,考察了KH-550用量、改性时间和改性温度等对活化系数的影响。实验得出Al2O3表面改性的最佳条件:改性剂用量2.0%、改性时间80min和改性温度80℃。通过粒度分析仪对改性后Al2O3颗粒水相分散液进行分析,峰值粒径越小和微分分布比例越集中说明分散效果越好,粒度分析的结果表明与活化系数表征效果一致。
Reinforced plate wear resistance is usually determined by the wear-resistant surface Al2O3 particles, Al2O3 particles in the water phase and organic resin dispersion is poor, easy to aggregate settlement. Surface modification can effectively improve the affinity between the two-phase interface, improve the wettability of organic resin on inorganic particles, and improve the dispersion of inorganic particles. The coupling agent KH-550 was used to modify the Al2O3 particles. The effect of KH-550 dosage, modification time and modification temperature on the activation coefficient was investigated. The optimum conditions of Al2O3 surface modification were obtained experimentally. The dosage of modifier was 2.0%, the modification time was 80 min and the modification temperature was 80 ℃. The particle size analyzer was used to analyze the aqueous dispersion of Al 2 O 3 particles. The smaller the peak particle diameter and the more concentrated the differential distribution were, the better the dispersing effect was. The results of the particle size analysis showed the same effect with the characterization of the activation coefficient.