异佛尔酮二异氰酸酯合成水性聚氨酯乳液的性能及纸张施胶应用,Progress in Organic Coatings

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异佛尔酮二异氰酸酯合成水性聚氨酯乳液的性能及纸张施胶应用
Progress in Organic Coatings ( IF 6.5 ) Pub Date : 2014-05-01 , DOI: 10.1016/j.porgcoat.2014.02.003
Yu-hua Guo , Jian-jun Guo , Hui Miao , Li-jun Teng , Zhen Huang

摘要在这项工作中，采用两步合成方法合成了一系列以异佛尔酮二异氰酸酯 (IPDI)、聚己内酯二醇 (PCL) 和二羟甲基丙酸 (DMPA) 为单体和乙二胺的水性聚氨酯 (WPU) 乳液。 (EDA) 分别作为扩链剂。详细研究了NCO/OH摩尔比、DMPA含量、化学品添加顺序和丙酮含量对所得乳液物理性质的影响。结果表明，乳液粘度随着 NCO/OH 摩尔比或 DMPA 含量的增加而增加，而随着丙酮用量的增加，它急剧下降。可以看到乳液粒径随着 NCO/OH 摩尔比的增加而增加，但随着 DMPA 含量的增加而减小。观察到化学品添加顺序强烈影响所得乳液的粒度和粘度。对于流延薄膜，随着 NCO/OH 摩尔比的增加，伸长率单调下降，而拉伸强度则先增加后下降。发现薄膜吸水能力随着 DMPA 含量的增加而增加。此外，用乳液施胶后，纸张的耐水性显着提高，与未施胶的对应物相比，30s Cobb 值下降了 63%。纸张耐折性和抗张指数也有一定程度的提高。为了生产性能良好的用于纸张施胶的 WPU 乳液，优选选择 NCO/OH 摩尔比为 1.6-1.8 和 DMPA 含量为 6.0-7.0 wt.%。

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Properties and paper sizing application of waterborne polyurethane emulsions synthesized with isophorone diisocyanate

Abstract In this work, a two-step synthesis methodology has been used to synthesize a series of waterborne polyurethane (WPU) emulsions with isophorone diisocyanate (IPDI), poly-caprolactone diol (PCL) and dimethylol propionic acid (DMPA) as monomers and ethylenediamine (EDA) as the chain extender, respectively. The influences of the NCO/OH molar ratio, DMPA content, chemicals-adding sequence, and acetone content on the physical properties of the resultant emulsions have been investigated in detail. The results show that the emulsion viscosity increases with an increase in the NCO/OH molar ratio or DMPA content whereas it declines sharply as the acetone amount increases. The emulsion particle size is seen to increase with the NCO/OH molar ratio but it decreases as the DMPA content increases. The chemicals-adding sequence is observed to strongly affect the particle size and viscosity of the resultant emulsions. For cast films, with an increase in the NCO/OH molar ratio, the elongation monotonically decreases while the tensile strength is seen to increase at first and then deceases. The film water absorption capacity is found to go up as the DMPA content increases. Furthermore, after sized with the emulsions, the paper water resistance is markedly improved and the 30s Cobb value is seen to decrease by 63% as compared to the unsized counterpart. The paper folding resistance and the tensile index are also improved to certain extents. For producing well-performed WPU emulsions for sizing paper sheets, an NCO/OH molar ratio of 1.6–1.8 and a DMPA content of 6.0–7.0 wt.% are preferably chosen.

更新日期：2014-05-01

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