CN112521581A - 一种合成革用水性聚氨酯面层树脂及其制备方法及应用 - Google Patents
一种合成革用水性聚氨酯面层树脂及其制备方法及应用 Download PDFInfo
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Abstract
本发明公开了一种合成革用水性聚氨酯面层树脂,其特征在于,按重量百分比计算,包括:二异氰酸酯9~10.5%,聚合物二醇19~23%,小分子二醇扩链剂0.55~1.05%,亲水扩链剂二羟甲基丙酸0.9~1.1%,有机铋催化剂0.003~0.005%,中和剂三乙胺0.65~0.83%,二元胺扩链剂N,N'‑双(2‑羟乙基)乙二胺1.2~2.1%,去离子水65%。本发明还公开了其制备方法和应用。本发明通过使用一种带有羟基的二胺扩链剂N,N'‑双(2‑羟乙基)乙二胺来按比例制备合成革用水性聚氨酯面层树脂后进行水性聚氨酯面层浆料的生产,在不改变现有生产工艺的条件下,即可改善水性面层与无溶剂中间层之间的剥离。
Description
技术领域
本发明涉及聚氨酯合成革制备技术领域,特别涉及一种合成革用水性聚氨酯面层树脂及其制备方法及在水性&无溶剂聚氨酯合成革中的应用。
背景技术
随着各项环保法规的出台以及人们环保意思的提高,环保型聚氨酯合成革越来越受到人们的重视与发展。其中水性面层搭配无溶剂中间层制备的合成革的发展最为迅速,但现在普遍存在一个问题,即水性面层与无溶剂中间层之间的结合力偏弱,存在剥离强度低的问题。
CN201810319239.3通过在无溶剂中间层中引入双键,搭配含有双键的水性面层,具体制备方法是:先在离型纸上涂覆双键封端型水性聚氨酯乳液,干燥固化后得到水性面层;然后在水性面层上涂覆无溶剂聚氨酯树脂,干燥至半干状态时与基布贴合,并进一步加热熟化;分离离型纸,经UV光固化后得到高剥离水性&无溶剂合成革。
虽然解决了水性面层与无溶剂中间层的剥离强度低的问题,但也增加了一道UV光固化的工序,提高了合成革的制造门槛与生产成本。
发明内容
本发明的目的在于提供一种合成革用水性聚氨酯面层树脂及其制备方法及在水性&无溶剂聚氨酯合成革中的应用,来解决现有技术中水性面层与无溶剂中间层之间剥离强度低的问题。
为了实现本发明的目的,所采用的技术方案是:
一种合成革用水性聚氨酯面层树脂,按重量百分比计算,包括:
在本发明的一个优选实施例中,所述聚合物二醇为聚四氢呋喃醚二元醇或聚己二酸丁二醇酯二元醇中的任意一种或多种,所述聚合物二元醇数均分子量为2000g/mol。
在本发明的一个优选实施例中,所述有机铋催化剂为聚合物二醇质量的0.02%。
在本发明的一个优选实施例中,所述二异氰酸酯为异佛尔酮二异氰酸酯或4,4’-二环己基甲烷二异氰酸酯中的任意一种或多种。
在本发明的一个优选实施例中,所述小分子二醇扩链剂为乙二醇或1,4-丁二醇中的任意一种或多种。
一种合成革用水性聚氨酯面层树脂的制备方法,包括如下步骤:
步骤一:将所述二异氰酸酯、聚合物二醇、小分子二醇扩链剂、亲水扩链剂二羟甲基丙酸、有机铋催化剂、第一丙酮溶液依次投入反应釜中,在异氰酸酯基团过量的情况下在60~70℃下至采用二正丁胺滴定法测定下的NCO%不高于3.47%;
步骤二:降温至30~40℃后加入第二丙酮溶液降粘后搅拌加入所述中和剂三乙胺后继续搅拌得混合物;
步骤三:将所述步骤二当中的混合物在1000~1500rpm的转速下在所述去离子水当中进行搅拌分散;
步骤四:在所述步骤三的分散产物中加入所述二元胺扩链剂N,N'-双(2-羟乙基)乙二胺后继续搅拌;
步骤五:在40~55℃温度下减压蒸馏脱除丙酮,得到所述合成革用水性聚氨酯面层树脂;
在本发明的一个优选实施例中,所述第一丙酮溶液与分散前PU固体份的比例为20:80,分散前PU固体份为步骤一和二中除第一丙酮溶液与第二丙酮溶液以外所有原料的质量总和。
在本发明的一个优选实施例中,所述第一丙酮溶液与第二丙酮溶液之和,与分散前PU固体份的比例为40:60,分散前PU固体份为步骤一和二中除第一丙酮溶液与第二丙酮溶液以外所有原料的质量总和。
在本发明的一个优选实施例中,所述去离子水与PU固体份的比例为35:65,PU固体份为所述步骤一至步骤四当中的配方中除去离子水、第一丙酮溶液和第二丙酮溶液以外的所有原料的质量总和。
一种合成革用水性聚氨酯面层树脂在水性&无溶剂聚氨酯合成革中的应用,所述应用为通过所述合成革用水性聚氨酯面层树脂来配制水性聚氨酯面层浆料。
在本发明的一个优选实施例中,所述水性聚氨酯面层浆料,按重量份计算,包括如下组分:
在本发明的一个优选实施例中,所述水性聚氨酯面层浆料由如下方式制备而得:
步骤一:将所述水性聚氨酯面层浆料的各组分依次加入搅拌桶内,在500~1000rpm下增稠至3000~5000cps,得水性聚氨酯面层工作浆;
步骤二:将所述水性聚氨酯面层工作浆涂覆在离型纸(优选工作浆厚度0.2mm)上后在100~130℃的温度下进行烘干(优选烘干时间为3~5分钟)得水性面层;
步骤三:在步骤二的水性面层上涂覆无溶剂中间层(优选涂覆厚度为厚度0.3mm)后在100℃下预熟化(优选预熟化时间为1~2分钟),再贴合基布,再在130~140℃温度下烘烤(优选烘烤时间为烘烤3~5分钟)之后将革样从离型纸上剥离。
本发明的有益效果为:
通过使用一种带有羟基的二胺扩链剂N,N'-双(2-羟乙基)乙二胺来按比例制备合成革用水性聚氨酯面层树脂后进行水性聚氨酯面层浆料的生产,在不改变现有生产工艺的条件下,即可改善水性面层与无溶剂中间层之间的剥离。
具体实施方式
本发明主要原理在于:在水性面层中通过N,N'-双(2-羟乙基)乙二胺在扩链后向水性面层聚氨酯链中引入羟基,而聚氮丙啶类固化剂不会与羟基发生反应,所以涂覆无溶剂中间层前,水性面层含有大量羟基。
因为加入N,N'-双(2-羟乙基)乙二胺,使得相比常规水性聚氨酯,在聚氨酯链中引入了羟基可以和无溶剂层中的异氰酸酯基团参与化学反应;
无溶剂中间层一般有A、B、C三个组分,A组分为羟基封端聚合物多元醇混合物,B组分为异氰酸酯封端的改性异氰酸酯混合物,C组分为催化剂,其中,B组分中异氰酸酯的摩尔数相对于A组分中羟基的摩尔数过量,所以,将无溶剂中间层涂覆在水性面层后,其B组分中的异氰酸酯基团与水性面层中的羟基基团也会反应,使水性面层与无溶剂中间层通过化学键连接起来,来提高剥离强度。
文中的第一丙酮溶液或第二丙酮溶液均为市售的丙酮溶液,并无其他特别含义。
实施例1
将9.19份异佛尔酮二异氰酸酯、21.9份聚四氢呋喃醚二元醇、0.67份乙二醇、1.05份二羟甲基丙酸、0.004份有机铋催化剂、8.4份第一丙酮溶液依次投入反应釜中,其中,异氰酸酯基团过量,60~70℃下反应至NCO%≤2.41%,采用二正丁胺滴定法测定;降温至30~40℃,加入14份第二丙酮溶液降粘,搅拌10~30分钟,加入0.79份中和剂三乙胺,搅拌10~30分钟,将上述混合物加入至1000~1500rpm高速搅拌下的65份去离子水中,维持搅拌10~30分钟,加入1.4份二元胺扩链剂N,N'-双(2-羟乙基)乙二胺,搅拌10~30分钟,在40~55℃减压蒸馏脱除丙酮,得到所述合成革用水性聚氨酯面层树脂。
配制水性聚氨酯面层浆料,将所得水性聚氨酯面层工作浆涂覆在离型纸上,厚度0.2mm,100~130℃,3~5分钟烘干,再在水性面层上涂覆无溶剂中间层,厚度0.3mm,100℃,1~2分钟,贴合基布,再130~140℃,烘烤3~5分钟,将革样从离型纸上剥离,测试剥离强度。
实施例2
将9.19份异佛尔酮二异氰酸酯、21.6份聚己二酸丁二醇酯二元醇、0.99份1,4-丁二醇、1.04份二羟甲基丙酸、0.004份有机铋催化剂、8.4份第一丙酮溶液依次投入反应釜中,其中,异氰酸酯基团过量,60~70℃下反应至NCO%≤2.41%,采用二正丁胺滴定法测定;降温至30~40℃,加入14份第二丙酮溶液降粘,搅拌10~30分钟,加入0.78份中和剂三乙胺,搅拌10~30分钟,将上述混合物加入至1000~1500rpm高速搅拌下的65份去离子水中,维持搅拌10~30分钟,加入1.4份二元胺扩链剂N,N'-双(2-羟乙基)乙二胺,搅拌10~30分钟,在40~55℃减压蒸馏脱除丙酮,得到所述合成革用水性聚氨酯面层树脂。
配制水性聚氨酯面层浆料,将所得水性聚氨酯面层工作浆涂覆在离型纸上,厚度0.2mm,100~130℃,3~5分钟烘干,再在水性面层上涂覆无溶剂中间层,厚度0.3mm,100℃,1~2分钟,贴合基布,再130~140℃,烘烤3~5分钟,将革样从离型纸上剥离,测试剥离强度。
实施例3
将9.93份异佛尔酮二异氰酸酯、20.71份聚己二酸丁二醇酯二元醇、0.63份乙二醇、0.99份二羟甲基丙酸、0.004份有机铋催化剂、8.25份第一丙酮溶液依次投入反应釜中,其中,异氰酸酯基团过量,60~70℃下反应至NCO%≤3.47%,采用二正丁胺滴定法测定;降温至30~40℃,加入13.75份第二丙酮溶液降粘,搅拌10~30分钟,加入0.75份中和剂三乙胺,搅拌10~30分钟,将上述混合物加入至1000~1500rpm高速搅拌下的65份去离子水中,维持搅拌10~30分钟,加入1.99份二元胺扩链剂N,N'-双(2-羟乙基)乙二胺,搅拌10~30分钟,在40~55℃减压蒸馏脱除丙酮,得到所述合成革用水性聚氨酯面层树脂。
配制水性聚氨酯面层浆料,将所得水性聚氨酯面层工作浆涂覆在离型纸上,厚度0.2mm,100~130℃,3~5分钟烘干,再在水性面层上涂覆无溶剂中间层,厚度0.3mm,100℃,1~2分钟,贴合基布,再130~140℃,烘烤3~5分钟,将革样从离型纸上剥离,测试剥离强度。
实施例4
将10.36份4,4’-二环己基甲烷二异氰酸酯、20.62份聚四氢呋喃醚二元醇、0.95份1,4-丁二醇、0.99份二羟甲基丙酸、0.004份有机铋催化剂、8.41份第一丙酮溶液依次投入反应釜中,其中,异氰酸酯基团过量,60~70℃下反应至NCO%≤2.29%,采用二正丁胺滴定法测定;降温至30~40℃,加入14.02份第二丙酮溶液降粘,搅拌10~30分钟,加入0.75份中和剂三乙胺,搅拌10~30分钟,将上述混合物加入至1000~1500rpm高速搅拌下的65份去离子水中,维持搅拌10~30分钟,加入1.34份二元胺扩链剂N,N'-双(2-羟乙基)乙二胺,搅拌10~30分钟,在40~55℃减压蒸馏脱除丙酮,得到所述合成革用水性聚氨酯面层树脂。
配制水性聚氨酯面层浆料,将所得水性聚氨酯面层工作浆涂覆在离型纸上,厚度0.2mm,100~130℃,3~5分钟烘干,再在水性面层上涂覆无溶剂中间层,厚度0.3mm,100℃,1~2分钟,贴合基布,再130~140℃,烘烤3~5分钟,将革样从离型纸上剥离,测试剥离强度。
实施例5
将11.15份4,4’-二环己基甲烷二异氰酸酯、19.7份聚己二酸丁二醇酯二元醇、0.6份乙二醇、0.94份二羟甲基丙酸、0.004份有机铋催化剂、8.28份第一丙酮溶液依次投入反应釜中,其中,异氰酸酯基团过量,60~70℃下反应至NCO%≤3.29%,采用二正丁胺滴定法测定;降温至30~40℃,加入13.79份第二丙酮溶液降粘,搅拌10~30分钟,加入0.71份中和剂三乙胺,搅拌10~30分钟,将上述混合物加入至1000~1500rpm高速搅拌下的65份去离子水中,维持搅拌10~30分钟,加入1.89份二元胺扩链剂N,N'-双(2-羟乙基)乙二胺,搅拌10~30分钟,在40~55℃减压蒸馏脱除丙酮,得到所述合成革用水性聚氨酯面层树脂。
配制水性聚氨酯面层浆料,将所得水性聚氨酯面层工作浆涂覆在离型纸上,厚度0.2mm,100~130℃,3~5分钟烘干,再在水性面层上涂覆无溶剂中间层,厚度0.3mm,100℃,1~2分钟,贴合基布,再130~140℃,烘烤3~5分钟,将革样从离型纸上剥离,测试剥离强度。
实施例6
将11.15份4,4’-二环己基甲烷二异氰酸酯、19.43份聚四氢呋喃醚二元醇、0.89份1,4-丁二醇、0.93份二羟甲基丙酸、0.004份有机铋催化剂、8.28份第一丙酮溶液依次投入反应釜中,其中,异氰酸酯基团过量,60~70℃下反应至NCO%≤3.29%,采用二正丁胺滴定法测定;降温至30~40℃,加入13.79份第二丙酮溶液降粘,搅拌10~30分钟,加入0.7份中和剂三乙胺,搅拌10~30分钟,将上述混合物加入至1000~1500rpm高速搅拌下的65份去离子水中,维持搅拌10~30分钟,加入1.89份二元胺扩链剂N,N'-双(2-羟乙基)乙二胺,搅拌10~30分钟,在40~55℃减压蒸馏脱除丙酮,得到所述合成革用水性聚氨酯面层树脂。
配制水性聚氨酯面层浆料,将所得水性聚氨酯面层工作浆涂覆在离型纸上,厚度0.2mm,100~130℃,3~5分钟烘干,再在水性面层上涂覆无溶剂中间层,厚度0.3mm,100℃,1~2分钟,贴合基布,再130~140℃,烘烤3~5分钟,将革样从离型纸上剥离,测试剥离强度。
实施例7
将4.67份异佛尔酮二异氰酸酯、5.51份4,4’-二环己基甲烷二异氰酸酯、10.32份聚四氢呋喃醚二元醇、10.32份聚己二酸丁二醇酯二元醇、0.32份乙二醇、0.47份1,4-丁二醇、0.99份二羟甲基丙酸、0.004份有机铋催化剂、8.33份第一丙酮溶液依次投入反应釜中,其中,异氰酸酯基团过量,60~70℃下反应至NCO%≤2.88%,采用二正丁胺滴定法测定;降温至30~40℃,加入13.89份第二丙酮溶液降粘,搅拌10~30分钟,加入0.75份中和剂三乙胺,搅拌10~30分钟,将上述混合物加入至1000~1500rpm高速搅拌下的65份去离子水中,维持搅拌10~30分钟,加入1.66份二元胺扩链剂N,N'-双(2-羟乙基)乙二胺,搅拌10~30分钟,在40~55℃减压蒸馏脱除丙酮,得到所述合成革用水性聚氨酯面层树脂。
配制水性聚氨酯面层浆料,将所得水性聚氨酯面层工作浆涂覆在离型纸上,厚度0.2mm,100~130℃,3~5分钟烘干,再在水性面层上涂覆无溶剂中间层,厚度0.3mm,100℃,1~2分钟,贴合基布,再130~140℃,烘烤3~5分钟,将革样从离型纸上剥离,测试剥离强度。
对比例1
将9.13份异佛尔酮二异氰酸酯、21.77份聚四氢呋喃醚二元醇、0.66份乙二醇、1.04份二羟甲基丙酸、0.004份有机铋催化剂、8.35份第一丙酮溶液依次投入反应釜中,其中,异氰酸酯基团过量,60~70℃下反应至NCO%≤2.41%,采用二正丁胺滴定法测定;降温至30~40℃,加入14份第二丙酮溶液降粘,搅拌10~30分钟,加入0.79份中和剂三乙胺,搅拌10~30分钟,将上述混合物加入至1000~1500rpm高速搅拌下的65份去离子水中,维持搅拌10~30分钟,加入1.6份二元胺扩链剂异佛尔酮二胺,搅拌10~30分钟,在40~55℃减压蒸馏脱除丙酮,得到所述合成革用水性聚氨酯面层树脂。
配制水性聚氨酯面层浆料,将所得水性聚氨酯面层工作浆涂覆在离型纸上,厚度0.2mm,100~130℃,3~5分钟烘干,再在水性面层上涂覆无溶剂中间层,厚度0.3mm,100℃,1~2分钟,贴合基布,再130~140℃,烘烤3~5分钟,将革样从离型纸上剥离,测试剥离强度。
对比例2
将4.64份异佛尔酮二异氰酸酯、5.47份4,4’-二环己基甲烷二异氰酸酯、10.25份聚四氢呋喃醚二元醇、10.25份聚己二酸丁二醇酯二元醇、0.32份乙二醇、0.46份1,4-丁二醇、0.98份二羟甲基丙酸、0.004份有机铋催化剂、8.28份第一丙酮溶液依次投入反应釜中,其中,异氰酸酯基团过量,60~70℃下反应至NCO%≤2.88%,采用二正丁胺滴定法测定;降温至30~40℃,加入13.79份第二丙酮溶液降粘,搅拌10~30分钟,加入0.74份中和剂三乙胺,搅拌10~30分钟,将上述混合物加入至1000~1500rpm高速搅拌下的65份去离子水中,维持搅拌10~30分钟,加入1.89份二元胺扩链剂异佛尔酮二胺,搅拌10~30分钟,在40~55℃减压蒸馏脱除丙酮,得到所述合成革用水性聚氨酯面层树脂。
配制水性聚氨酯面层浆料,将所得水性聚氨酯面层工作浆涂覆在离型纸上,厚度0.2mm,100~130℃,3~5分钟烘干,再在水性面层上涂覆无溶剂中间层,厚度0.3mm,100℃,1~2分钟,贴合基布,再130~140℃,烘烤3~5分钟,将革样从离型纸上剥离,测试剥离强度。
表1:实施例1~7和对比例1~2的剥离强度。
由表1可知:采用含N,N'-双(2-羟乙基)乙二胺扩链剂的水性面层剥离强度均高于使用不含羟基二胺扩链剂的水性面层。
Claims (10)
2.如权利要求1所述的一种合成革用水性聚氨酯面层树脂,其特征在于,所述聚合物二醇为聚四氢呋喃醚二元醇或聚己二酸丁二醇酯二元醇中的任意一种或多种,所述聚合物二元醇数均分子量为2000g/mol。
3.如权利要求1所述的一种合成革用水性聚氨酯面层树脂,其特征在于,所述有机铋催化剂为聚合物二醇质量的0.02%。
4.如权利要求1所述的一种合成革用水性聚氨酯面层树脂,其特征在于,所述二异氰酸酯为异佛尔酮二异氰酸酯或4,4’-二环己基甲烷二异氰酸酯中的任意一种或多种。
5.如权利要求1所述的一种合成革用水性聚氨酯面层树脂,其特征在于,所述小分子二醇扩链剂为乙二醇或1,4-丁二醇中的任意一种或多种。
6.如权利要求1-5当中任意一项所述的一种合成革用水性聚氨酯面层树脂的制备方法,其特征在于,包括如下步骤:
步骤一:将所述二异氰酸酯、聚合物二醇、小分子二醇扩链剂、亲水扩链剂二羟甲基丙酸、有机铋催化剂、第一丙酮溶液依次投入反应釜中,在异氰酸酯基团过量的情况下在60~70℃下反应至采用二正丁胺滴定法测定下的NCO%不高于3.47%;
步骤二:降温至30~40℃后加入第二丙酮溶液降粘后搅拌加入所述中和剂三乙胺后继续搅拌得混合物;
步骤三:将所述步骤二当中的混合物加入至1000~1500rpm高速搅拌下的去离子水中并维持搅拌;
步骤四:在所述步骤三的分散产物中加入所述二元胺扩链剂N,N'-双(2-羟乙基)乙二胺后继续搅拌;
步骤五:在40~55℃温度下减压蒸馏脱除丙酮,得到所述合成革用水性聚氨酯面层树脂。
7.如权利要求6所述的一种合成革用水性聚氨酯面层树脂的制备方法,其特征在于,所述第一丙酮溶液与分散前PU固体份的比例为20:80,分散前PU固体份为步骤一和二中除第一丙酮溶液与第二丙酮溶液以外所有原料的质量总和;
所述第一丙酮溶液与第二丙酮溶液之和与分散前PU固体份的比例为40:60,分散前PU固体份为步骤一和二中除第一丙酮溶液与第二丙酮溶液以外所有原料的质量总和;
所述去离子水与PU固体份的比例为35:65,PU固体份为所述步骤一至步骤四当中的配方中除去离子水、第一丙酮溶液和第二丙酮溶液以外的所有原料的质量总和。
8.如权利要求1-5当中任意一项所述的一种合成革用水性聚氨酯面层树脂在水性&无溶剂聚氨酯合成革中的应用,其特征在于,所述应用为通过所述合成革用水性聚氨酯面层树脂来配制水性聚氨酯面层浆料并制备水性&无溶剂聚氨酯合成革。
10.如权利要求9所述的一种应用,其特征在于,所述水性聚氨酯面层浆料由如下方式制备而得:
步骤一:将所述水性聚氨酯面层浆料的各组分依次加入搅拌桶内,在500~1000rpm下增稠至3000~5000cps,得水性聚氨酯面层工作浆;
步骤二:将所述水性聚氨酯面层工作浆涂覆在离型纸上后在100~130℃的温度下进行烘干得水性面层;
步骤三:在步骤二的水性面层上涂覆无溶剂中间层后在100℃下预熟化,再贴合基布,再在130~140℃温度下烘烤之后将革样从离型纸上剥离。
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