自乳化剂对钙塑瓦楞纸板用水性黏合剂性能的影响

采用丙酮法，以二羟甲基丙酸（DMPA）为自乳化剂，以聚碳酸酯二醇为软段，合成了一系列水性聚氨酯黏合剂，通过纳米粒度分析仪、扫描电子显微镜、电子万能试验机、实验压缩仪等对聚氨酯乳液及胶膜性能进行表征。结果表明，聚氨酯乳液粒径随二羟甲基丙酸含量的增加而减小最终趋于稳定，黏度随之增大；粒度分布逐渐变窄；随着亲水基团的增多，胶膜断裂伸长率减小，拉伸强度增大，胶膜由柔软向脆硬变化；黏合剂对钙塑瓦楞纸板有良好的黏合效果，钙塑基材经过表面处理可显著提高黏合强度，黏合强度随着DMPA含量的增大呈抛物线趋势变化，在DMPA质量分数为4％时黏合剂性能最好，黏合强度最大。

Influence of the Self-emulsifier on Properties of Waterborne Adhesives for Calcium Carbonate-plastic Corrugated Cardboard

A series of waterborne polycarbonate polyurethane adhesives were prepared by the acetone process,polycarbonate diol （PCD 2000） were used as the soft segment, dimethylol propionie acid （DMPA） was used as the hydrophilie group. The effect of DMPA loading on the properties such as viscosity, particle size and adhesive strength of the WPU adhesive was studied. The experiment results indicated that the particle size of WPU emulsion decreased with increasing DMPA content while dispersion viscosity showed an opposite trend. Particle size distribution of WPU emulsion became narrow gradually and tended to stable finally. Elongation at break of the film from WPU emulsion decreased and the tensile strength increased with an increasing of DMPA content. The adhesive strength between the calcium carbonate-plastic corrugating medium andliner board was enhanced significantly after surface treatment of the calcium carbonate-plastic sheet and presented parabolic trend with increasing DMPA content, The adhesive strength reached a maximum when DMPA content was about 4%.