CN105037685A - 一种聚丁二烯型聚氨酯(脲)的合成方法 - Google Patents
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Abstract
一种聚丁二烯型聚氨酯(脲)的合成方法。首先由端羟基聚丁二烯橡胶、异氰酸酯和2,5-二氨基-3,6-二甲硫基甲苯反应,制得苯胺基封端的聚丁二烯预聚物,然后,苯胺基封端的聚丁二烯预聚物作为一个主要组份,与固化剂反应得到聚丁二烯型聚氨酯(脲);固化剂是甲苯二异氰酸酯、异佛尔酮二异氰酸酯、4,4’-二苯基甲烷二异氰酸酯、1,6-己二异氰酸酯中的一种或几种的混合物;制备的聚丁二烯型聚氨酯(脲),其拉伸强度大于10MPa,拉断伸长率大于400%,邵氏A硬度45~85。
Description
技术领域:
一种聚丁二烯型聚氨酯(脲)的合成方法,属于密封胶、粘合剂领域。
背景技术:
聚丁二烯型聚氨酯(脲)既具有通用聚氨酯(脲)优良的高弹性、耐磨性等特点,又兼具聚丁二烯橡胶耐低温性能、电性能和抗水解性能等特点。通用的聚丁二烯型聚氨酯(脲)合成工艺主要分为“一步法”和“预聚法”两种方法。“一步法”是将液体端羟基聚丁二烯橡胶、异氰酸酯和小分子固化剂直接共混反应制备聚丁二烯型聚氨酯(脲);“预聚法”是先由过量异氰酸酯与液体端羟基聚丁二烯橡胶反应,得到异氰酸酯封端的聚丁二烯预聚物,用时将该预聚物再与小分子固化剂反应得到聚丁二烯型聚氨酯(脲)。
专利200710062127.6公开了“一步法”制备聚丁二烯型聚氨酯:将液体端羟基聚丁二烯橡胶,端羟基聚四氢呋喃齐聚物和1,4-正丁醇脱水后于80℃~100℃加入4,4’-二苯基甲烷二异氰酸酯(MDI)搅拌反应得到。文献(陈清元等,高分子材料科学与工程,2000,16(5):70)报道了“预聚法”制备聚丁二烯型聚氨酯的方法:将液体端羟基聚丁二烯橡胶先与甲苯二异氰酸酯(TDI)在60℃反应2小时得到异氰酸酯封端的聚丁二烯预聚物,再加入二醇扩链剂反应得到。专利200810163821.1公开了“预聚法”制备聚丁二烯型聚氨酯(脲)的方法:将液体端羟基聚丁二烯橡胶与甲苯二异氰酸酯(TDI)常温常压下搅拌1~3小时,再加入二苯基甲烷二胺反应得到。
上述“一步法”和“预聚法”制备聚丁二烯型聚氨酯(脲)的合成工艺各有优缺点:由于异氰酸酯易与空气中的水汽反应,在“一步法”制备工艺中,异氰酸酯为小组份易于方便贮存;但制备过程中,由于异氰酸酯和液体聚丁二烯的羟基反应活性与空气中湿气(水)活性相当,因此“一步法”易受到外界水汽的反应干扰;且在反应中,由于小分子固化剂活性高于聚丁二烯的羟基活性,使得制备的聚丁二烯型聚氨酯(脲)因软、硬段相分离程度较大而可能导致材料强度降低。“预聚法”先制备异氰酸酯封端的聚丁二烯预聚物,由于异氰酸酯中一个官能团先与端羟基聚丁二烯完全反应,另一个在后续固化过程中再与小分子固化剂反应,这样减少了聚丁二烯型聚氨酯(脲)软、硬段相分离程度,确保了材料的本体强度,但预聚后,异氰酸酯封端的聚丁二烯预聚体,贮存过程中异氰酸酯仍易与空气中的水汽反应,预聚体不易长时间保存。
发明内容:
本发明是一种聚丁二烯型聚氨酯(脲)的合成方法:首先由端羟基聚丁二烯橡胶、异氰酸酯和2,5-二氨基-3,6-二甲硫基甲苯反应,制得苯胺基封端的聚丁二烯预聚物,然后,苯胺基封端的聚丁二烯预聚物,与固化剂反应得到聚丁二烯型聚氨酯(脲);固化剂是甲苯二异氰酸酯、异佛尔酮二异氰酸酯、4,4’-二苯基甲烷二异氰酸酯、1,6-己二异氰酸酯中的一种或几种的混合物。
制备的聚丁二烯型聚氨酯(脲),其拉伸强度大于10MPa,拉断伸长率大于400%,邵氏A硬度45~85。
具体步骤:
(1)苯胺基封端的聚丁二烯预聚物合成:100重量份液体端羟基聚丁二烯橡胶(羟值为0.2~2mmol/g),1~10重量份异佛尔酮二异氰酸酯,0.005~0.1重量份有机锡催化剂,氮气条件下60±10℃搅拌反应1~2小时,待异氰酸酯官能团剩余40%~60%时(利用红外光谱法监测2270cm-1处的异氰酸酯吸收峰面积下降40%~60%),加入3~30重量份2,5-二氨基-3,6-二甲硫基甲苯,在25±10℃搅拌反应24-48小时(利用红外光谱法监测2270cm-1处的异氰酸酯吸收峰消失),得到苯胺基封端的聚丁二烯预聚物。
(2)聚丁二烯型聚氨酯(脲)合成:100重量份的苯胺基封端的聚丁二烯预聚物,5~40重量份固化剂混合均匀,50℃3天或室温7天以上完全固化。固化剂是甲苯二异氰酸酯、异佛尔酮二异氰酸酯、4,4’-二苯基甲烷二异氰酸酯、1,6-己二异氰酸酯中的一种或几种的混合物。
本发明优点:采取预先制备苯胺基封端的聚丁二烯预聚物作为一个主要组份,再与固化剂反应的合成工艺的优点体现在:(1)合成的苯胺基封端的聚丁二烯预聚物不含异氰酸酯基团,不会与空气中水汽反应,有利于其长期贮存;(2)苯胺基封端的聚丁二烯预聚物,由于液体聚丁二烯与小分子胺(硬段)预先反应接枝,减小了聚丁二烯型聚氨酯(脲)软、硬段的相分离程度,材料强度高;(3)预聚物中苯胺基与异氰酸酯的反应活性大于羟基数倍,苯胺基封端的聚丁二烯预聚物与异氰酸酯优先反应,可以大幅度降低空气中水汽对反应的干扰。
具体实施例:
实施例1
预聚物合成:100g端羟基聚丁二烯(羟值0.75mmol/g),加入2.9g异佛尔酮二异氰酸酯,加入0.04g二月桂酸二丁基锡,混合均匀后氮气条件下55℃反应1.5小时(利用红外光谱法监测2270cm-1处的异氰酸酯吸收峰面积下降50%),加入15.4g2,5-二氨基-3,6-二甲硫基甲苯,23℃反应48小时(利用红外光谱法监测2270cm-1处的异氰酸酯吸收峰消失),得到苯胺基封端的聚丁二烯预聚物。
聚丁二烯型聚氨酯(脲)制备:向上述118.3g苯胺基封端的聚丁二烯预聚物中加入24.6g异佛尔酮二异氰酸酯,混合均匀后脱气,50℃固化3天。
材料性能:拉伸强度19.5MPa;拉断伸长率585%;邵氏A硬度83。
实施例2
预聚物合成:100g端羟基聚丁二烯(羟值0.75mmol/g),加入2.9g异佛尔酮二异氰酸酯(IPDI),加入0.04g二月桂酸二丁基锡,混合均匀后氮气条件下60℃反应1.5小时(利用红外光谱法监测2270cm-1处的异氰酸酯吸收峰面积下降55%),加入7.4g2,5-二氨基-3,6-二甲硫基甲苯,23℃反应48小时(利用红外光谱法监测2270cm-1处的异氰酸酯吸收峰消失),得到苯胺基封端的聚丁二烯预聚物。
聚丁二烯型聚氨酯(脲)制备:向上述110.3g苯胺基封端的聚丁二烯预聚物中加入14.7g异佛尔酮二异氰酸酯(IPDI),混合均匀后脱气,50℃固化3天。
材料性能:拉伸强度11.8MPa;拉断伸长率518%;邵氏A硬度65。
实施例3
预聚物合成:100g端羟基聚丁二烯(羟值0.49mmol/g),加入1.9g异佛尔酮二异氰酸酯,加入0.04g二月桂酸二丁基锡,混合均匀后密封条件50℃反应1.5小时(利用红外光谱法监测2270cm-1处的异氰酸酯吸收峰面积下降48%),加入16.4g2,5-二氨基-3,6-二甲硫基甲苯,23℃反应48小时(利用红外光谱法监测2270cm-1处的异氰酸酯吸收峰消失),得到苯胺基封端的聚丁二烯预聚物。
聚丁二烯型聚氨酯(脲)制备:向上述118.3g苯胺基封端的聚丁二烯预聚物中加入20g异佛尔酮二异氰酸酯和4g甲苯二异氰酸酯,混合均匀后脱气,50℃固化3天。
材料性能:拉伸强度10.2MPa;拉断伸长率533%;邵氏A硬度78。
Claims (3)
1.一种聚丁二烯型聚氨酯(脲)的合成方法,端羟基聚丁二烯橡胶、异氰酸酯,其特征是首先和2,5-二氨基-3,6-二甲硫基甲苯反应,制得苯胺基封端的聚丁二烯预聚物,然后,苯胺基封端的聚丁二烯预聚物与固化剂反应得到聚丁二烯型聚氨酯(脲);固化剂是甲苯二异氰酸酯、异佛尔酮二异氰酸酯、4,4’-二苯基甲烷二异氰酸酯、1,6-己二异氰酸酯中的一种或几种的混合物。
2.如权利要求1所述的聚丁二烯型聚氨酯(脲)的合成方法,其特征是苯胺基封端的聚丁二烯预聚物是由100重量份液体端羟基聚丁二烯橡胶,1~10重量份异佛尔酮二异氰酸酯,0.005~0.1重量份有机锡催化剂,氮气条件下60±10℃搅拌反应1~2小时,待异氰酸酯官能团剩余40%~60%时,加入3~30重量份2,5-二氨基-3,6-二甲硫基甲苯,25±10℃搅拌反应24-48小时得到的。
3.如权利要求1所述的聚丁二烯型聚氨酯(脲)的合成方法,其特征是100重量份的苯胺基封端的聚丁二烯预聚物,5~40重量份固化剂混合均匀,50℃3天或室温7天以上固化得到聚丁二烯型聚氨酯(脲)。
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