CN108330712A - 印花胶浆用聚(碳酸酯-醚)型聚氨酯乳液及制备方法 - Google Patents

印花胶浆用聚(碳酸酯-醚)型聚氨酯乳液及制备方法 Download PDF

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CN108330712A
CN108330712A CN201711326232.6A CN201711326232A CN108330712A CN 108330712 A CN108330712 A CN 108330712A CN 201711326232 A CN201711326232 A CN 201711326232A CN 108330712 A CN108330712 A CN 108330712A
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宋海峰
王焕
蒋红梅
陆银锋
唐劲松
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Shanghai Huafon New Material Research & Development Technology Co Ltd
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Abstract

本发明公开了一种印花胶浆用聚(碳酸酯‑醚)型聚氨酯乳液及制备方法,印花胶浆用聚(碳酸酯‑醚)型聚氨酯乳液,是采用包括如下重量份的组分制备的:聚(碳酸酯‑醚)二元醇30~40份,二异氰酸酯16~30份,聚醚二元醇10‑20份,非离子亲水扩链剂2‑5份,催化剂0.03~0.05份,非亲水性小分子扩链剂0.4~4.0份,离子型亲水扩链剂1~2.5份,水50~55份,后扩链剂0.5~1.0份。本发明具有优异的柔软、高弹、常/低温耐弯折性能。本发明的水性聚氨酯乳液,原料成本较低,产品手感优、高回弹、高耐湿热、耐曲挠、对颜填料相容性佳。

Description

印花胶浆用聚(碳酸酯-醚)型聚氨酯乳液及制备方法
技术领域
本发明涉及一种聚(碳酸酯-醚)型水性聚氨酯乳液及其制备方法。
背景技术
丝网印花是一种代替染料在纺织品上印花的生产工艺。印花胶浆是丝网印花的主要原料:为体现针织品的柔软弹性,胶浆中的主体树脂必须具有柔软、干爽不粘不硬的特点;为方便施工、保证丝印厚度,要求树脂具有较高固含。传统印花树脂多为水性丙烯酸酯乳液,由于丙烯酸酯树脂具有成膜弹性差、热黏冷脆、耐洗牢度差、复配成胶浆易堵网,成为弹性柔软性、易施工的难点,水性聚氨酯可以有效弥补水性丙烯酸酯类的缺陷,同时高固含的聚氨酯乳液更易体现出成膜后的优质手感。
专利CN104262572A报道了选用聚碳酸酯多元醇和聚醚多元醇组合,亲水基团采用具有强亲水性的磺酸基聚酯多元醇和二羟甲基丙酸相结合的方式生产印花胶浆用水性聚氨酯树脂。上述报道的方法多元醇原料成本偏高,采用二羟甲基丙酸作为亲水扩链剂,此类亲水扩链剂生产时间长、效率不高且不利于合成高固含乳液。另外,合成的聚氨酯树脂残留中和剂且该类乳液对酸、碱、电解质等环境因素敏感,不利于胶浆的复配。
专利CN102206410A报道了一种固含量在50%-60%的聚氨酯乳液的合成方法。选用了两种(羧酸型和磺酸型配合)扩链剂,同时添加了外乳化剂,采用自乳化和外乳化相结合的方法,提高了乳液的乳化性能,合成了高固含的乳液。上述报道的方法存在乳液成膜后有外加乳化剂残留的问题,影响制品的耐水解性及机械强度。
专利CN104975521A报道了选用聚碳酸酯二元醇和聚四亚甲基二元醇组合,亲水基团采用二氨基磺酸基盐和聚乙二醇相结合的方式制备印花胶浆用水性聚氨酯树脂。上述报道的方法多元醇原料成本偏高,聚氨酯主链上引入不同分子量的亲水性聚乙二醇来实现亲水性,不利于保持聚氨酯胶膜的力学性能及机械强度。
聚醚和聚酯多元醇是目前合成水性聚氨酯最主要的多元醇原料。以聚醚型多元醇为原料易制备高固含乳液,但胶膜强度低、耐磨性差。以聚酯型多元醇为原料制备的聚氨酯预聚体粘度相对较高,固含量相对聚醚型要低,而且聚酯型水性聚氨酯有储存稳定性差,耐水解差的缺点。虽然聚四氢呋喃二醇及聚碳酸酯二醇制备的水性聚氨酯具有强度高、耐水解、耐候性好的优点,但原料成本较高且常规工艺不易制备高固含乳液。以丙酮法为例:选择结晶性较强的聚碳酸酯多元醇,在合成过程中加入大量的丙酮稀释预聚体,仍能顺利乳化,若采取常规脱溶釜减压脱除溶剂的方法:加热介质温度高、脱溶时间长造成聚氨酯粒子间边界层结合水挥发、乳液粒子相互接触,乳液粘度变大、甚至成膏状,影响高固含量乳液的制备。
发明内容
本发明的第一个目的是提供一种印花胶浆用聚(碳酸酯-醚)型水性聚氨酯乳液,以克服现有技术存在的缺陷。
第二个目的是提供一种印花胶浆用聚(碳酸酯-醚)型水性聚氨酯乳液的制备方法,以便于工业化实施。
所述的印花胶浆用聚(碳酸酯-醚)型水性聚氨酯乳液,是采用包括如下重量份的组分制备的:
所述的聚(碳酸酯-醚)二元醇,优选的数均分子量1000-6000、碳酸酯单元20-70%;
其中,所述的碳酸酯单元20-70%指的是重量比;
所述的二异氰酸酯选自异佛尔酮二异氰酸酯(IPDI)、六亚甲基二异氰酸酯(HDI),双环己基甲烷二异氰酸酯(HMDI),甲苯二异氰酸酯(TDI)中的至少两种。优选的为异氟尔酮二异氰酸酯(IPDI)和1,6-己二异氰酸酯(HDI),优选的比例为IPDI:HDI=1:0.5~1(重量比);
所述聚醚多元醇为数均分子量为1000-3000聚四氢呋喃多元醇;
所述非离子亲水扩链剂为数均分子量1000-2500的三羟甲基丙烷聚乙二醇单甲醚;
所述催化剂为环保型有机铋催化剂;
所述非亲水性小分子扩链剂为1,4-丁二醇、1,6-己二醇、乙二醇、一缩二乙二醇、3-甲基-1,5-戊二醇、新戊二醇中的至少一种;
所述的离子型亲水扩链剂为乙二胺基乙磺酸钠;
所述的后扩链剂为异氟尔酮二胺、乙二胺、二乙烯三胺、水合肼中的一至两种;
所述的印花胶浆用聚(碳酸酯-醚)型水性聚氨酯乳液固含60%~65%;
所述的印花胶浆用聚(碳酸酯-醚)型水性聚氨酯乳液的制备方法,包括预聚、亲水扩链、乳化、后扩链和脱溶剂步骤;
具体的包括如下步骤:
(1)将聚(碳酸酯-醚)二元醇和聚醚二元醇在100-110℃下减压脱除多元醇中水,在惰性气氛中降温至65℃~70℃,加入非离子扩链剂、非亲水性小分子扩链剂、二异氰酸酯和催化剂,80-90℃反应2-3h,反应过程中,加入有机溶剂如丙酮,以调节反应体系的粘度为3000-4000cp(45℃),测NCO至1.80±0.2%,得聚氨酯预聚体;
所述惰性气氛可使用氮气;
(2)将步骤(1)所述的预聚体温度在40℃~45℃,加入离子型亲水扩链剂反应5-10分钟,加有机溶剂如丙酮稀释至粘度1000-2000cp(25℃),加水乳化,加入后扩链剂,再搅拌5-10分钟;
(3)将步骤(2)得到的含丙酮的聚(碳酸酯-醚)型水性聚氨酯乳液,真空脱除溶剂,即可获得所述的重量固含量为60%~65%的聚(碳酸酯-醚)型水性聚氨酯乳液;
优选的,包括如下步骤:将步骤(2)得到的含丙酮的聚(碳酸酯-醚)型水性聚氨酯乳液送入降膜蒸发器顶部,在乳液经液体分布器分布后,呈膜状沿管程向下流动,在压力-0.085Mpa~-0.095Mpa和壳程为50℃~55℃的条件下,丙酮汽化,气液混合物由加热管下端引出,经气液分离器分离,收集液相,即得重量固含量为60%~65%的聚(碳酸酯-醚)型水性聚氨酯乳液,气相经冷却器冷却,获得回收的有机溶剂,可重复使用。
与现有技术相比,本发明的有益效果如下:
本发明使用了聚(碳酸酯-醚)多元醇,是一种以二氧化碳和环氧丙烷为原料通过反应制得的多元醇,原料二氧化碳易得、减少了聚合物的合成对石化资源的依赖。该类多元醇中同时含有大量的醚键和碳酸酯键,大量醚键的存在使得该类多元醇常温下仍具有流动性,以其为原料制备的聚氨酯预聚体粘度不大,易于乳化获得较高固含的乳液,同时醚键结构使得聚氨酯具有良好的柔顺性能。碳酸酯键的存在使合成的聚氨酯具有很好的机械强度、耐水性和良好的结合牢度。该类多元醇配合使用适量的聚四氢呋喃多元醇,与二异氰酸酯反应生成的聚合物材料,具有一般聚酯型聚氨酯和聚醚型聚氨酯,或聚酯、聚醚复配使用所不具有的性能:由于原料的特殊结构及与其他原料的合理配比,使制备的聚(碳酸酯-醚)水性聚氨酯乳液具有优异的柔软、高弹、常/低温耐弯折性能。
本发明在二氧化碳基聚(碳酸酯-醚)为基础原料的前提下,采用侧链含有聚乙氧基结构的非离子型亲水扩链剂和磺酸型亲水性扩链剂共同扩链,该方法无需添加胺中和,简化了合成工艺、提高了生产效率。该方案制得的二氧化碳基聚(碳酸酯-醚)水性聚氨酯乳液具有更好的稳定性,同时该聚氨酯乳液对酸、碱、电解质等各种环境因素不敏感、不易导致破乳现象,对复配成印花胶浆时添加的填料、助剂具有很好的包容性。另外,聚氨酯侧链引入非离子型亲水结构更有利于发挥基团的亲水性,提高乳液的渗透性,改善胶浆的堵塞丝网的现象,并且侧基含有醚键的柔性链段对聚氨酯有增塑作用,利于提高成膜的延伸率。
本发明提供了一种降膜蒸发器配合减压的脱溶装置,在一定真空度下,乳液经液体分布器分布后呈膜状沿蒸发管内(管程)向下流动,管程内的液膜和壳程的热水发生热交换,丙酮汽化。该脱溶工艺具有乳液受热均匀、蒸发面积较大,对加热介质的温度要求不高的特点,可有效缩短脱溶时间、提高生产效率。该脱溶工艺更适合高固含量乳液的溶剂脱除:乳液和加热介质温差低、乳液停留时间短有利于保持聚氨酯粒子间边界层结合水不被汽化和减少粒子内部结合水向外迁移,从而提高乳液在脱溶过程中的稳定性,有助于制备高固含量乳液。本发明的水性聚氨酯乳液,原料成本较低,产品手感优、高回弹、高耐湿热、耐曲挠、对颜填料相容性佳。
附图说明
图1为降膜蒸发器和脱溶装置结构示意图。
具体实施方式
参见图1,所述的降膜蒸发器和脱溶装置,包括降膜蒸发器1、气液分离器2和冷凝器3;
所述的降膜蒸发器1的下部出口与气液分离器2的分离液入口相连接,气液分离器2的下部设有产品出口,气液分离器2的上部设有气相出口,所述的气相出口与冷凝器3相连接;
优选的,所述的膜蒸发器1的原料入口处,设有液体分布器101;
实施例1
异佛尔酮二异氰酸酯(IPDI)9份,六亚甲基二异氰酸酯(HDI)7份,聚(碳酸酯-醚)二元醇(分子量2500、聚碳酸酯单元60%)40份,聚四氢呋喃多元醇(分子量1000)10份,三羟甲基丙烷聚乙二醇单甲醚(分子量1000)2份,1,4-丁二醇0.4份,乙二胺基乙磺酸钠1份,有机铋催化剂0.03份,丙酮45份,去离子水50份,异佛尔酮二胺0.5份;
制备方法:
(1)将聚(碳酸酯-醚)二元醇和聚四氢呋喃二元醇加热到100℃、减压脱除多元醇中水,在惰性气氛中降温至65℃加入三羟甲基丙烷聚乙二醇单甲醚、1,4-丁二醇、二异氰酸酯和催化剂,80℃反应3h,反应过程中,加入丙酮,以调节反应体系的粘度为3000-4000cp(45℃),测NCO至1.80±0.2%,得聚氨酯预聚体。
(2)将(1)所述的预聚体温度在45℃,加入乙二胺基乙磺酸钠反应5分钟,加丙酮稀释至粘度1000-2000cp(25℃),加水乳化,加入后异氟尔酮二胺,搅拌5分钟。
(3)将(2)得到的含丙酮的聚(碳酸酯-醚)型水性聚氨酯乳液通过进料泵从降膜蒸发器顶部进入管程,压力-0.095Mpa,降膜蒸发器的壳程为50℃热水。气液混合物由加热管下端引出,经气液分离即得重量固含量为65%的聚(碳酸酯-醚)型水性聚氨酯乳液。
实施例2
异佛尔酮二异氰酸酯(IPDI)10份,六亚甲基二异氰酸酯(HDI)6份,聚(碳酸酯-醚)二元醇(分子量2500、聚碳酸酯单元60%)40份,聚四氢呋喃多元醇(分子量2000)20份,三羟甲基丙烷聚乙二醇单甲醚(分子量1200)4份,新戊二醇0.5份,乙二胺基乙磺酸钠2.5份,有机铋催化剂0.03份,丙酮55份,去离子水52份,乙二胺0.5份;
制备方法:
(1)将聚(碳酸酯-醚)二元醇和聚四氢呋喃二元醇加热到110℃、减压脱除多元醇中水,在惰性气氛中降温至70℃加入三羟甲基丙烷聚乙二醇单甲醚、1,4-丁二醇、二异氰酸酯和催化剂,90℃反应2h,反应过程中,加入丙酮,以调节反应体系的粘度为3000-4000cp(45℃),测NCO至1.80±0.2%得聚氨酯预聚体。
(2)将(1)所述的预聚体温度在40℃,加入乙二胺基乙磺酸钠反应10分钟,加丙酮稀释至粘度1000-2000cp(25℃),加水乳化,加入后异氟尔酮二胺,搅拌10分钟。
(3)将(2)得到的含丙酮的聚(碳酸酯-醚)型水性聚氨酯乳液通过进料泵从降膜蒸发器顶部进入管程,压力-0.085Mpa,降膜蒸发器的壳程为55℃热水。气液混合物由加热管下端引出,经气液分离即得重量固含量为62%的聚(碳酸酯-醚)型水性聚氨酯乳液。
实施例3
异佛尔酮二异氰酸酯(IPDI)15份,六亚甲基二异氰酸酯(HDI)8份,聚(碳酸酯-醚)二元醇(分子量2500、聚碳酸酯单元60%)35份,聚四氢呋喃多元醇(分子量2000)20份,三羟甲基丙烷聚乙二醇单甲醚(分子量1200)5份,新戊二醇1份,乙二胺基乙磺酸钠2.5份,有机铋催化剂0.03份,丙酮58份,去离子水55份,水合肼0.8份;
制备方法同实施例1,得固含60%的聚(碳酸酯-醚)型水性聚氨酯乳液。
实施例4
异佛尔酮二异氰酸酯(IPDI)10份,六亚甲基二异氰酸酯(HDI)10份,聚(碳酸酯-醚)二元醇(分子量2500、聚碳酸酯单元60%)40份,聚四氢呋喃多元醇(分子量2000)20份,三羟甲基丙烷聚乙二醇单甲醚(分子量1200)4份,1,6-己二醇1份,乙二胺基乙磺酸钠2.5份,有机铋催化剂0.05份,丙酮58份,去离子水54份,二乙烯三胺0.5份;
制备方法同实施例2,得固含63%的聚(碳酸酯-醚)型水性聚氨酯乳液。
实施例5
异佛尔酮二异氰酸酯(IPDI)15份,六亚甲基二异氰酸酯(HDI)15份,聚(碳酸酯-醚)二元醇(分子量2500、聚碳酸酯单元60%)30份,聚四氢呋喃多元醇(分子量2000)20份,三羟甲基丙烷聚乙二醇单甲醚(分子量1200)5份,一缩二乙二醇4份,乙二胺基乙磺酸钠2.5份,有机铋催化剂0.04份,丙酮60份,去离子水55份,二乙烯三胺1份;
制备方法同实施例1,得固含62%的聚(碳酸酯-醚)型水性聚氨酯乳液。
对比例1
本对比例在实施例1的基础上将三羟甲基丙烷聚乙二醇单甲醚和乙二胺基乙磺酸钠替换成二羟甲基丙酸:
异佛尔酮二异氰酸酯(IPDI)9份,六亚甲基二异氰酸酯(HDI)7份,聚(碳酸酯-醚)二元醇(分子量2500、聚碳酸酯单元60%)40份,聚四氢呋喃多元醇(分子量1000)10份,二羟甲基丙酸4份,1,4-丁二醇0.4份,有机铋催化剂0.05份,三乙胺3份,丙酮50份,去离子水65份,异佛尔酮二胺0.5份;
制备方法:
(1)将聚(碳酸酯-醚)二元醇和聚四氢呋喃二元醇加热到110℃、减压脱除多元醇中水,在惰性气氛中降温至70℃加入二羟甲基丙酸、1,4-丁二醇、二异氰酸酯和催化剂,85℃反应4h,加入丙酮,以调节反应体系的粘度为3000-4000cp(45℃),测NCO至1.80±0.2%,得聚氨酯预聚体。
(2)将(1)所述的预聚体加丙酮稀释至粘度1000-1500cp(25℃),加入三乙胺中和10分钟,加水乳化,乳化后加入异佛尔酮二胺再中速搅拌10分钟。
(3)将(2)得到的含丙酮的聚(碳酸酯-醚)型水性聚氨酯乳液使用降膜蒸发器减压脱溶,得固含35%的聚(碳酸酯-醚)型水性聚氨酯乳液。
对比例2
本对比例为在实施例1的基础上将聚(碳酸酯-醚)二元醇替换成聚己二酸新戊二醇酯:
异佛尔酮二异氰酸酯(IPDI)9份,六亚甲基二异氰酸酯(HDI)7份,聚己二酸新戊二醇酯(PNA分子量2000)40份,聚四氢呋喃多元醇(分子量1000)10份,三羟甲基丙烷聚乙二醇单甲醚(分子量1000)2份,1,4-丁二醇0.4份,乙二胺基乙磺酸钠1份,有机铋催化剂0.03份,丙酮45份,去离子水50份,异佛尔酮二胺0.5份;
制备方法同实施例1,得固含50%的常规聚酯/聚醚型水性聚氨酯乳液。
对比例3
本对比例为在实施例1的基础上将降膜蒸发器改为常规脱溶釜:
异佛尔酮二异氰酸酯(IPDI)9份,六亚甲基二异氰酸酯(HDI)7份,聚(碳酸酯-醚)二元醇(分子量2500、聚碳酸酯单元60%)40份,聚四氢呋喃多元醇(分子量1000)10份,三羟甲基丙烷聚乙二醇单甲醚(分子量1000)2份,1,4-丁二醇0.4份,乙二胺基乙磺酸钠1份,有机铋催化剂0.03份,丙酮45份,去离子水50份,异佛尔酮二胺0.5份;
制备方法:
(1)将聚(碳酸酯-醚)二元醇和聚四氢呋喃二元醇加热到110℃、减压脱除多元醇中水,在惰性气氛中降温至70℃加入三羟甲基丙烷聚乙二醇单甲醚、1,4-丁二醇、二异氰酸酯和催化剂,85℃反应3h,加入丙酮,以调节反应体系的粘度为3000-4000(45℃)cp,测NCO至1.80±0.2%,得聚氨酯预聚体;
(2)将(1)所述的预聚体温度在45℃,加入乙二胺基乙磺酸钠反应10分钟,加丙酮稀释至粘度1000-2000cp(25℃),加水高速乳化,乳化后加入异佛尔酮二胺再中速搅拌10分钟。常规脱溶釜减压蒸馏脱除丙酮,脱溶至固含60%停止脱溶。
将实施例1-5和对比例1-3所得的聚氨酯乳液欧蒽吉增稠剂Gel 0620增稠,粘度约8000cp,然后使用在织物上印刷,烘干对比后进行对比测试,结果如表1。
表1
注:1、干膜牢度检测:《织物涂层耐磨测试方法》,织物平磨仪FZ/T01011-91。
2、水洗牢度检测:GB/T8629-2001《纺织品实验用家庭洗涤和干燥程序》,一家用洗衣机;
3、耐弯折检测:QB/T 2714-2005《皮革物理和机械试验耐折牢度的测定》,立式耐寒试验机GT-7006-V50、皮革耐挠试验机GT-7071B;
综上所述,本发明实施例中,采用二氧化碳基聚(碳酸酯-醚)多元醇和磺酸型结构、侧链含有聚乙氧基结构提供亲水性,配合使用降膜蒸发器-减压脱溶装置,制备的聚(碳酸酯-醚)水性聚氨酯乳液固含高,成膜柔软、高弹、常/低温耐弯折优,生产过程简化、生产效率提高。

Claims (10)

1.印花胶浆用聚(碳酸酯-醚)型聚氨酯乳液,其特征在于,是采用包括如下重量份的组分制备的:
2.根据权利要求1所述的所述的花胶浆用聚(碳酸酯-醚)型聚氨酯乳液,其特征在于,所述的聚(碳酸酯-醚)二元醇的数均分子量1000-6000、碳酸酯单元20-70%。
3.根据权利要求2所述的所述的花胶浆用聚(碳酸酯-醚)型聚氨酯乳液,其特征在于,所述的二异氰酸酯选自异佛尔酮二异氰酸酯(IPDI)、六亚甲基二异氰酸酯(HDI),双环己基甲烷二异氰酸酯(HMDI),甲苯二异氰酸酯(TDI)中的至少两种。
4.根据权利要求3所述的所述的花胶浆用聚(碳酸酯-醚)型聚氨酯乳液,其特征在于,所述的二异氰酸酯为二异氰酸酯异氟尔酮二异氰酸酯(IPDI)和1,6-己二异氰酸酯(HDI),比例为IPDI:HDI=1:0.5~3。
5.根据权利要求1~4任一项所述的所述的花胶浆用聚(碳酸酯-醚)型聚氨酯乳液,其特征在于,所述聚醚多元醇为数均分子量为1000-3000聚四氢呋喃多元醇。
6.根据权利要求1~4任一项所述的所述的花胶浆用聚(碳酸酯-醚)型聚氨酯乳液,其特征在于,所述非离子亲水扩链剂为数均分子量1000-2500的三羟甲基丙烷聚乙二醇单甲醚;
所述非亲水性小分子扩链剂为1,4-丁二醇、1,6-己二醇、乙二醇、一缩二乙二醇、3-甲基-1,5-戊二醇、新戊二醇中的至少一种;
所述的离子型亲水扩链剂为乙二胺基乙磺酸钠;
所述的后扩链剂为异氟尔酮二胺、乙二胺、二乙烯三胺、水合肼中的一至两种。
7.根据权利要求1~6任一项所述的所述的花胶浆用聚(碳酸酯-醚)型聚氨酯乳液制备方法,其特征在于,包括预聚、亲水扩链、乳化、后扩链和脱溶剂步骤。
8.根据权利要求7所述的方法,其特征在于,包括如下步骤:
(1)将聚(碳酸酯-醚)二元醇和聚醚二元醇在100-110℃下减压脱除多元醇中水,在惰性气氛中降温,加入非离子扩链剂、非亲水性小分子扩链剂、二异氰酸酯和催化剂,反应,反应过程中,加入有机溶剂调节反应体系的粘度,测NCO至1.80±0.2%,得聚氨酯预聚体;
(2)将步骤(1)所述的预聚体加入离子型亲水扩链剂反应,加有机溶剂稀释,加水乳化,加入后扩链剂,再搅拌;
(3)将步骤(2)得到的含丙酮的聚(碳酸酯-醚)型水性聚氨酯乳液,真空脱除溶剂,即可获得所述的印花胶浆用聚(碳酸酯-醚)型聚氨酯乳液。
9.根据权利要求8所述的方法,其特征在于,包括如下步骤:(1)将聚(碳酸酯-醚)二元醇和聚醚二元醇在100-110℃下减压脱除多元醇中水,在惰性气氛中降温至65℃~70℃,加入非离子扩链剂、非亲水性小分子扩链剂、二异氰酸酯和催化剂,80-90℃反应2-3h,反应过程中,加入有机溶剂调节反应体系的粘度为3000-4000cp(45℃),测NCO至1.80±0.2%,得聚氨酯预聚体;
(2)将步骤(1)所述的预聚体温度在40℃~45℃,加入离子型亲水扩链剂反应5-10分钟,加有机溶剂稀释至粘度1000-2000cp(25℃),加水乳化,加入后扩链剂,再搅拌5-10分钟。
10.根据权利要求8所述的方法,其特征在于,将步骤(2)得到的含丙酮的聚(碳酸酯-醚)型水性聚氨酯乳液送入降膜蒸发器顶部,在乳液经液体分布器分布后,呈膜状沿管程向下流动,在压力-0.085Mpa~-0.095Mpa和壳程为50℃~55℃的条件下,丙酮汽化,气液混合物由加热管下端引出,经气液分离器分离,收集液相,即可获得所述的印花胶浆用聚(碳酸酯-醚)型聚氨酯乳液。
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