CN104140518A - 一种亲水性单组份水固化聚氨酯及其制备方法 - Google Patents
一种亲水性单组份水固化聚氨酯及其制备方法 Download PDFInfo
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Abstract
本发明提供一种亲水性单组份水固化聚氨酯及其制备方法,采用阴离子开环聚合手段,以聚乙二醇为起始二元醇,在KOH存在的条件下,与环氧丙烷进行开环聚合,通过调节聚乙二醇分子量、聚乙二醇加入量以及环氧丙烷加入量,合成具有不同分子量及亲疏水链段长度的多元醇;在催化剂的作用下,将多元醇与异氰酸酯反应,加入适量的增塑剂、抗氧化剂、紫外线吸收剂,制备出端基为-NCO基团的聚氨酯预聚体;预聚体与水以一定比例混合,得到单组份水固化聚氨酯。本发明方法简单,操作简便,所得产品固含量高、固化速度快、保水量高、储存稳定性好,且具有良好的柔韧性、耐候性、耐酸碱性,在治理水土流失和制备防水材料等方面有广阔的应用前景。
Description
(一)技术领域
本发明涉及一种聚氨酯,属于材料和化工领域,具体地说是一种亲水性单组份水固化聚氨酯及其制备方法。
(二)背景技术
聚氨酯固化后涂膜具有良好的装饰性、优异的粘结性、耐摩擦性、高弹性、和光泽度,深受市场和广大消费者亲睐。目前使用较多的是溶剂型聚氨酯。近年来由于人们对环境保护的需要,低挥发性有机化合物(VOC)含量的聚氨酯日益引起人们的广泛关注。低VOC含量聚氨酯性能的改善主要体现在以下两个方面:1)提高聚氨酯固含量来最大限度的减少溶剂用量,降低VOC含量;2)减少聚氨酯中游离异氰酸酯单体含量,开发高性能、无毒的聚氨酯。
近年来,单组份水固化聚氨酯的研究日益活跃,水固化聚氨酯以水为固化剂,施工方便且无毒、无味、无污染,既保持了溶剂型聚氨酯优良的物理机械性能,同时所需溶剂少,因此溶剂的挥发大大降低,对环境的影响小,更为环保。但单组份水固化聚氨酯固含量低、固化时间长、保水量低。
(三)发明内容
本发明的技术任务是针对现有技术的不足,提供一种亲水性单组份水固化聚氨酯的制备方法,解决了单组份水固化聚氨酯固含量低、固化速度慢、保水量低的问题。
本发明采用的技术方案是:
一种亲水性单组份水固化聚氨酯,采用阴离子开环聚合手段,以聚乙二醇作为起始二元醇,在KOH存在的条件下,与环氧丙烷进行开环聚合,通过调节聚乙二醇分子量、聚乙二醇加入量以及环氧丙烷加入量,合成具有不同分子量及亲疏水链段长度的多元醇;在催化剂的作用下,将制备出的多元醇与异氰酸酯反应,再加入适量的增塑剂、抗氧化剂、紫外线吸收剂混合,降至室温,出料后加入稀释剂,制备出制备出端基为-NCO基团的聚氨酯预聚体;将聚氨酯预聚体和水按照质量份数1∶1-1∶35进行反应,得到亲水性单组份水固化聚氨酯;
所述聚氨酯预聚体原料组成及各组分质量份数如下:
聚乙二醇:20-60份;KOH:0.2-5份;环氧丙烷:3-20份;催化剂:0.2-1份;异氰酸酯:0.6-25份;增塑剂:0-2份;抗氧化剂:1-5份;紫外线吸收剂:0.1-1份;稀释剂:4-18份。
其中所述的聚乙二醇分子量范围是1000-10500。
其中所述的催化剂为三乙胺、二月桂酸二丁基锡中的一种或两种。
其中所述的异氰酸酯为甲苯二异氰酸酯、二苯甲烷二异氰酸酯中的一种或两种。
其中所述的增塑剂为三甘醇或四甘醇的脂肪族二酯、邻苯二甲酸二异辛酯、癸二酸二烷基酯、乙二酸二烷基酯、磷酸三有机酯中的一种或几种。
其中所述的抗氧化剂为苯酚类、酚类、膦类、酯类有机物中的一种或几种。
其中所述的紫外线吸收剂由0-80份的苯并***和20-100份的苯酮组成。
其中所述的稀释剂为丙酮、丁酮中的一种或两种。
一种亲水性单组份水固化聚氨酯的制备方法,包括步骤如下:
1)按照上述质量份数称取各组分;
2)将聚乙二醇与KOH加入到四口烧瓶中,在真空度为0.1MPa、温度为100-120℃油浴条件下脱水1-3h,降温至70℃-90℃;
3)将冷凝管、温度计及氮气接口接入到四口烧瓶中,抽真空及氮气置换3-5次,以除尽四口烧瓶内的空气;保持该温度不变,在氮气保护的条件下,利用恒压滴液漏斗滴加上述质量份数的环氧丙烷,滴加完毕后继续反应直至无回流现象,冷却至室温,得粗多元醇;
4)向步骤3)的粗多元醇中加入二氯甲烷,利用真空抽滤装置,用硅藻土代替滤纸以除去KOH,调节pH为5-6,并加入干燥剂、浓缩得到多元醇;
5)将步骤4)得到的多元醇加入到装有温度计、电搅拌器的三口烧瓶中,升高温度至50-75℃,加入上述质量份数的催化剂、异氰酸酯,反应1.5-3h,再加入上述质量份数的增塑剂、抗氧化剂、紫外线吸收剂,继续反应1-2h,降低温度至室温,加入稀释剂,得到端基为-NCO基团的聚氨酯预聚体;
6)将步骤5)制备的聚氨酯预聚体和水按照质量份数1∶1-1∶35进行反应,得到亲水性单组份水固化聚氨酯;
其中步骤4)所述的干燥剂为硫酸镁、氯化钙、氯化镁中的一种或几种。
本发明方法简单,操作简便,所得产品固含量在80%-89%、保水量≥35,与水混合后固化时间为30s-1800s,而且具有良好的柔韧性、耐候性、耐酸碱性以及储存稳定性,在治理水土流失和制备防水材料等方面有广阔的应用前景。,
附图说明
图1为本发明实施例1中聚氨酯预聚体的FT-IR图。
具体实施方式
以下结合附图和具体实施方式对本发明做进一步的描述。
本发明的亲水性单组份水固化聚氨酯原料组成为:聚乙二醇、KOH、环氧丙烷、催化剂、异氰酸酯、增塑剂、抗氧化剂、紫外线吸收剂、稀释剂、干燥剂和水。
其中,增塑剂为三甘醇或四甘醇的脂肪族二酯、邻苯二甲酸二异辛酯、癸二酸二烷基酯、乙二酸二烷基酯、磷酸三有机酯中的一种或几种;抗氧化剂为苯酚类、酚类、膦类、酯类等有机物中的一种或几种;紫外线吸收剂由0-80份的苯并***和20-100份的苯酮组成。
采用美国Nicolet公司生产的Avatar370FT-IR型红外光谱仪测试本发明制备的聚氨酯预聚体的FT-IR红外光谱。
实施例1:
1)将20.12g聚乙二醇2000、0.95g KOH加入到四口烧瓶中,在真空度为0.1MPa、温度为110℃油浴条件下脱水2h,降温至85℃;
2)将冷凝管、温度计及氮气接口接入到四口烧瓶,抽真空及氮气置换3次,以除尽四口烧瓶内的空气;保持该温度不变,在氮气保护的条件下,利用恒压滴液漏斗滴加5.83g环氧丙烷,滴加完毕后继续反应直至无回流现象,冷却至室温,得粗多元醇;
3)向步骤3)的粗多元醇中加入100mL的二氯甲烷,利用真空抽滤装置,用硅藻土代替滤纸以除去KOH,调节pH为5,并加入干燥剂硫酸镁,浓缩得到多元醇;
4)将步骤3)得到的多元醇加入到装有温度计、电搅拌器的三口烧瓶中,升高温度至55℃的条件下,加入0.81g三乙胺催化剂、3.52g甲苯二异氰酸酯,反应2h,再加入1.15g增塑剂、1.45g抗氧化剂、0.75g紫外线吸收剂,保温反应2h,降低温度至室温,加入6mL丙酮,得到端基为-NCO基团的聚氨酯预聚体;
5)称取步骤4)所得聚氨酯预聚体5.00g,与100mL水混合,制得亲水性单组份水固化聚氨酯。利用磁力搅拌器混合均匀,倒入模具成膜,测试其性能,结果列于下表中:
序号 | 测试项目 | 测试结果 |
1 | 拉伸强度/MPa | 20.87 |
2 | 断裂伸长率/% | 324.23 |
3 | 固含量/% | 86.56 |
4 | 表干时间a/min | 8.5 |
5 | 实干时间a/h | 9.5 |
a测试温度20℃
实施例2:
1)将20.00g聚乙二醇1000、0.20g KOH加入到四口烧瓶中,在真空度为0.1MPa、温度为100℃油浴条件下脱水1h,降温至70℃;
2)将冷凝管、温度计及氮气接口接入到四口烧瓶,抽真空及氮气置换4次,以除尽四口烧瓶内的空气;保持该温度不变,在氮气保护的条件下,恒压滴液漏斗缓慢滴加3.00g环氧丙烷,滴加完毕后继续反应直至无回流现象,冷却至室温,得粗多元醇;
3)向步骤2)的粗多元醇中加入加入80mL的二氯甲烷,利用真空抽滤装置,用硅藻土代替滤纸以除去KOH,调节pH为5,并加入干燥剂氯化钙,浓缩得到多元醇;
4)将步骤3)得到的多元醇加入到装有温度计、电搅拌器的三口烧瓶中,升高温度至50℃的条件下,加入0.20g二月桂酸二丁基锡催化剂、0.60g二苯甲烷二异氰酸酯,反应1.5h,再加入1.00g抗氧化剂、0.10g紫外线吸收剂,保温反应1h,降低温度至室温,加入4mL丁酮,得到端基为-NCO基团的聚氨酯预聚体;
5)称取步骤4)所得聚氨酯预聚体10.00g,与10mL水混合,制得亲水性单组份水固化聚氨酯。
实施例3:
1)将60.00g聚乙二醇10500、5.00g KOH加入到四口烧瓶中,在真空度为0.1MPa、温度为120℃油浴条件下脱水3h,降温至90℃;
2)将冷凝管、温度计及氮气接口接入到四口烧瓶,抽真空及氮气置换5次,以除尽四口烧瓶内的空气;保持该温度不变,在氮气保护的条件下,恒压滴液漏斗缓慢滴加20.00g环氧丙烷,滴加完毕后继续反应直至无回流现象,冷却至室温,得粗多元醇;
3)向步骤2)的粗多元醇中加入120mL的二氯甲烷,利用真空抽滤装置,用硅藻土代替滤纸以除去KOH,调节pH为6,并加入干燥剂硫酸镁、氯化镁,浓缩得到多元醇;
4)将步骤3)得到的多元醇加入到装有温度计、电搅拌器的三口烧瓶中,升高温度至75℃的条件下,加入0.40g三乙胺和0.60g二月桂酸二丁基锡组成的混合催化剂、15.00g二苯甲烷二异氰酸酯和10.00g二苯甲烷二异氰酸酯组成的混合物,反应3h,再加入2.00g增塑剂、5.00g抗氧化剂、1.00g紫外线吸收剂,保温反应1.5h,降低温度至室温,加入10mL丙酮和8mL丁酮,得到端基为-NCO基团的聚氨酯预聚体;
5)称取步骤4)所得聚氨酯预聚体1.00g,与35mL水混合,制得亲水性单组份水固化聚氨酯。
Claims (10)
1.一种亲水性单组份水固化聚氨酯及其制备方法,其特征在于,采用阴离子开环聚合手段,以聚乙二醇作为起始二元醇,在KOH存在的条件下,与环氧丙烷进行开环聚合,通过调节聚乙二醇分子量、聚乙二醇加入量以及环氧丙烷加入量,合成具有不同分子量及亲疏水链段长度的多元醇;在催化剂的作用下,将制备出的多元醇与异氰酸酯反应,再加入适量的增塑剂、抗氧化剂、紫外线吸收剂,降至室温,出料后加入稀释剂,制备出端基为-NCO基团的聚氨酯预聚体;将聚氨酯预聚体和水按照质量份数1∶1-1∶35进行反应,得到亲水性单组份水固化聚氨酯;
所述聚氨酯预聚体的原料组成及各组分质量份数如下:
聚乙二醇:20-60份;KOH:0.2-5份;环氧丙烷:3-20份;催化剂:0.2-1份;异氰酸酯:0.6-25份;增塑剂:0-2份;抗氧化剂:1-5份;紫外线吸收剂:0.1-1份;稀释剂:4-18份。
2.根据权利要求书1所述的亲水性单组份水固化聚氨酯,其特征在于,所述的聚乙二醇分子量范围是1000-10500。
3.根据权利要求书1所述的亲水性单组份水固化聚氨酯,其特征在于,所述的催化剂为三乙胺、二月桂酸二丁基锡中的一种或两种。
4.根据权利要求书1所述的亲水性单组份水固化聚氨酯,其特征在于,所述的异氰酸酯为甲苯二异氰酸酯、二苯甲烷二异氰酸酯中的一种或两种。
5.根据权利要求书1所述的亲水性单组份水固化聚氨酯,其特征在于,所述的增塑剂为三甘醇或四甘醇的脂肪族二酯、邻苯二甲酸二异辛酯、癸二酸二烷基酯、乙二酸二烷基酯、磷酸三有机酯中的一种或几种。
6.根据权利要求书1所述的亲水性单组份水固化聚氨酯,其特征在于,所述的抗氧化剂为苯酚类、酚类、膦类、酯类有机物中的一种或几种。
7.根据权利要求书1所述的亲水性单组份水固化聚氨酯,其特征在于,所述的紫外线吸收剂由0-80份的苯并***和20-100份的苯酮组成。
8.根据权利要求书1所述的亲水性单组份水固化聚氨酯,其特征在于,所述的稀释剂为丙酮、丁酮中的一种或两种。
9.一种亲水性单组份水固化聚氨酯的制备方法,其特征在于,包括以下步骤:
1)按照上述质量份数称取各组分;
2)将聚乙二醇与KOH加入到四口烧瓶中,在真空度为0.1MPa、温度为100-120℃油浴条件下脱水1-3h,降温至70℃-90℃;
3)将冷凝管、温度计及氮气接口接入到四口烧瓶,抽真空及氮气置换3-5次,以除尽四口烧瓶内的空气;保持该温度不变,在氮气保护的条件下,利用恒压滴液漏斗滴加上述质量份数的环氧丙烷,滴加完毕后继续反应,直至无回流现象,冷却至室温,得粗多元醇;
4)向步骤3)的粗多元醇中加入二氯甲烷,利用真空抽滤装置,用硅藻土代替滤纸除去KOH,调节pH为5-6,并加入干燥剂、浓缩得到多元醇;
5)将步骤4)中的多元醇加入到装有温度计、电搅拌器的三口烧瓶中,升高温度至50-75℃,加入上述质量份数的催化剂、异氰酸酯,反应1.5-3h,再加入上述质量份数的增塑剂、抗氧化剂、紫外线吸收剂,继续反应1-2h,降低温度至室温,加入稀释剂,得到端基为-NCO基团的聚氨酯预聚体;
6)将步骤5)制备的聚氨酯预聚体和水按照质量份数1∶1-1∶35进行反应,得到亲水性单组份水固化聚氨酯。
10.根据权利要求9所述的亲水性单组份水固化聚氨酯的制备方法,其特征在于,所述的干燥剂为硫酸镁、氯化钙、氯化镁中的一种或几种。
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