聚氨酯/羧基丁苯胶胶乳的表面施胶及其交联对纸张表面强度及耐折度的影响

Surface sizing and crosslinking of waterborne polyurethane/carboxylated styrene-butadiene rubberletex and effect of it on folding endurance and surface strength of the paper

以聚己内酯二元醇(CAPA)为软缎,甲苯二异氰酸酯(TDI)为硬段,二羟甲基丙酸(DMPA)为亲水单体,采用自乳化法制备了水性聚氨酯乳液,并用此聚氨酯乳液与羧基丁苯胶(XSBRL)以及外加交联剂氮丙啶(aziridine)进行复配制得水性聚氨酯/羧基丁苯胶复合乳液。实验研究了此复合乳液对纸张的表面施胶性能,并优化了合成工艺条件。研究表明,当n能,并且氮丙啶的加入能进一步提高纸张的表面强度和耐折度。

A series of anionic waterborne polyurethane emulsion were successfully prepared by the reaction of polycaprolactone diols（CAPA）,toluene diisocyanate（TDI）,dimethylolpropionic acid（DMPA）.A kind of waterborne polyurethane/carboxylated styrene-butadiene rubberletex compound latex was synthesized by polyurethane,carboxylated styrene-butadiene rubberletex and aziridine as crosslinker.The factors affecting its synthetic condition were discussed,and the synthetic process was optimized.The results show that the compound emulsion owns excellent sizing property when n（TDI）∶n（CAPA）=1.4,m（DMPA）=6%,m（PU）/m（XSBRL）=2/1,m（aziridine）=2%.The papers＇ sizing value can reach 30s,folding endurance reach 86 times and surface strength reach 2.5m/s with 0.5% compound emulsion addition.And the polymer was characterized with TG and DLLS.