CN109504268B - 一种单组份聚氨酯防水涂料的制备方法 - Google Patents
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Abstract
本发明公开了一种单组份聚氨酯防水涂料的制备方法,包括以下步骤:1)将聚醚多元醇和多孔微珠载体吸气剂混合,通过加热真空脱水后与异氰酸酯进行反应生成端基为‑NCO的预聚体,其中所述聚醚多元醇和异氰酸酯的比例以重量比计为3‑8:1;2)将步骤1)所得预聚体加入催化剂进行聚合反应,得到单组份聚氨酯防水涂料。所述方法制备的涂料不含MOCA,不含焦油,溶剂和重金属,固化后无味道,环保无毒,具有优异的力学性能和化学性能,同时具有优异的防水性能。产品符合GB/T19250‑2013中有害物限量的要求,可在潮湿基面施工。
Description
技术领域
本发明属于化工技术领域,具体涉及一种单组份聚氨酯防水涂料及其制备方法。
背景技术
聚氨酯防水涂料是一种新型防水涂料,具有优异的防水性,高弹性,强粘结性,耐高低温性,耐酸碱腐蚀性,被广泛应用于建筑防水领域。
聚氨酯涂料在欧美日等国家最先被推广应用,到70年代随着我国科学技术进步和化学建材工业的发展,聚氨酯防水涂料也获得了发展,北京建筑工程研究所从1974年开始进行聚醚型聚氨酯防水涂料理论研究。90年代后,聚氨酯防水涂料取得迅速发展,经过20年的实践,我国已经逐渐形成了聚氨酯系列防水产品。
随着人们环保意识的增强,焦油型聚氨酯防水涂料由于污染环境、危害人体健康,国家逐步限制其使用,向聚醚型聚氨酯防水涂料转变。MOCA作为聚醚型聚氨酯防水涂料最常用的固化剂,具有致癌的危险,对环境和人体健康有很大危害。环保型单组份聚氨酯防水涂料,不再使用MOcA作为固化剂,且无溶剂,与传统的聚氨酯防水涂料相比,具有无溶剂挥发、无味、不受湿度影响等优点,有很好的市场前景。
发明内容
本发明的目的是提供一种以多孔微珠为载体吸气剂的单组份聚氨酯防水涂料及其制备方法,通过关键吸气剂的制备,控制NCO的含量、反应物质摩尔比等参数,得到该涂料最佳的使用效果。
一种单组份聚氨酯防水涂料的制备方法,包括以下步骤:
1)将聚醚多元醇和多孔微珠载体吸气剂混合,通过加热真空脱水后与异氰酸酯进行反应生成端基为-NCO的预聚体,其中所述聚醚多元醇和异氰酸酯的比例以重量比计为3-8:1;
2)将步骤1)所得预聚体加入催化剂进行聚合反应,得到单组份聚氨酯防水涂料。所述方法不使用MOCA。
进一步,所述聚醚多元醇为聚醚二元醇和/或聚醚三元醇,所述聚醚多元醇的相对分子质量为1000-5000。
进一步,所述多孔微珠载体吸气剂通过以下步骤制备,将多孔微珠与水按照6-8:1比例进行混合,浸泡1h,反复循环清洗2-3次,在300±5℃高温烘烤3小时,冷却降温至80℃,加入吸气物质,再次混合0.5小时,升温至150℃高温、加压条件下,进行吸附1小时,制得多孔微珠载体吸气剂,其中所述多孔微珠与吸气物质质量比例:1-3:1。
进一步,所述异氰酸酯选自二苯基甲基二异氰酸酯和甲苯二异氰酸酯。
进一步,步骤2)中所述催化剂选自有机锡,三亚乙基二胺和三乙胺;步骤2)中还加入流平剂、耐老化剂和消泡剂。
进一步,所述的多孔微珠选自陶瓷多孔空心微珠,玻璃多孔微珠和膨胀珍珠岩。
进一步,所述的吸气物质选自氧化钙,氧化鎂和碳酸钙。
进一步,步骤1)中还加入增塑剂和填料。所述增塑剂选自氯化石蜡、邻苯二甲酸二辛酯和邻苯二甲酸二丁酯。所述填料选自滑石粉 ,重钙,陶土,硫酸钡,钛白粉,高领土,铁红和炭黑。
进一步,所述消泡剂为有机硅消泡剂。
上述涂料在使用时按照涂料与水10:0.8-2.5的重量配比搅拌混合均匀即可固化。
本发明方法制备的涂料不含MOCA,不含焦油,溶剂和重金属,固化后无味道,环保无毒,具有优异的力学性能和化学性能,同时具有优异的防水性能。产品符合GB/T19250-2013中有害物限量的要求,可在潮湿基面施工。
具体实施方式
以下结合实施例对本发明作进一步描述。
实施例1 取88g聚醚二元醇、30g聚醚三元醇、90g增塑剂,加入三口烧瓶,升温至70℃,加入15g陶瓷多孔微珠——吸附辅助剂——氧化钙,83g滑石粉和20g高岭土,升温至105℃-125℃真空脱水3h,降温至40-50℃,加入8.6甲苯二异氰酸酯,缓慢升温,控制温度在75-83℃,反应2h,降温至70℃以下,加入催化剂、流平剂、耐老化剂、消泡剂,搅拌30min,出料即得到本发明的防水涂料。
实施例2
取88g聚醚二元醇、30g聚醚三元醇、90g增塑剂,加入三口烧瓶,升温至70℃,加入15g陶瓷多孔微珠——吸附辅助剂——氧化钙——氧化鎂。83g滑石粉和20g高岭土,升温至105℃-125℃真空脱水3h,降温至40-50℃,加入8.6甲苯二异氰酸酯,缓慢升温,控制温度在75-83℃,反应2h,降温至70℃以下,加入催化剂、流平剂、耐老化剂、消泡剂,搅拌30min,出料即得到本发明的防水涂料。
实施例3
取88g聚醚二元醇、30g聚醚三元醇、90g增塑剂,加入三口烧瓶,升温至70℃,加入15g陶瓷多孔微珠——吸附辅助剂——氧化鎂,83g滑石粉和20g高岭土,,升温至105℃-125℃真空脱水3h,降温至40-50℃,加入8.6甲苯二异氰酸酯,缓慢升温,控制温度在75-83℃,反应2h,降温至70℃以下,加入催化剂、流平剂、耐老化剂、消泡剂,搅拌30min,出料即可得到本发明的防水涂料。
实施例4
取88g聚醚二元醇、30g聚醚三元醇、90g增塑剂,加入三口烧瓶,升温至70℃,加入5g氧化鎂,94g滑石粉和20g高岭土,升温至105℃-125℃真空脱水3h,降温至40-50℃,加入8.6甲苯二异氰酸酯,缓慢升温,控制温度在75-83℃,反应2h,降温至70℃以下,加入催化剂、流平剂、耐老化剂、消泡剂,搅拌30min,出料即可得到本发明的防水涂料。
性能测试:
将上述方法制备的单组份聚氨酯防水涂料加入10%水搅拌混合均匀涂膜,按照GBIT19250-2013聚氨酯防水涂料标准检测。其表1为单组份聚氨酯防水涂料的一些基本性能检测结果。
表1环保型单组份聚氨酯防水涂料的性能检测结果
从上表可以看出,采用多孔微珠为载体的吸气剂制备的单组份聚氨酯防水涂料,其实施例1、2、3产品各项指标均超过GBIT19250-2013标准要求的技术指标;未使用多孔微珠作载体制备的单组份聚氨酯涂料,其实施例4产品各项指标均低于GBIT19250-2013标准要求的技术指标。
Claims (7)
1.一种单组份聚氨酯防水涂料的制备方法,其特征在于,包括以下步骤:
1)将聚醚多元醇和多孔微珠载体吸气剂混合,通过加热真空脱水后与异氰酸酯进行反应生成端基为-NCO的预聚体,其中所述聚醚多元醇和异氰酸酯的比例以重量比计为3-8:1;
所述多孔微珠载体吸气剂通过以下步骤制备,将多孔微珠与水按照6-8:1比例进行混合,浸泡,清洗,烘烤,冷却,加入吸气物质,混合,加热进行吸附,制得多孔微珠载体吸气剂,所述多孔微珠与吸气物质的质量比例为1-3:1;
所述的多孔微珠选自陶瓷多孔空心微珠,玻璃多孔微珠和膨胀珍珠岩;
所述的吸气物质选自氧化钙,氧化鎂和碳酸钙;
2)将步骤1)所得预聚体加入催化剂进行聚合反应,得到单组份聚氨酯防水涂料。
2.如权利要求1所述的方法,其特征在于,所述聚醚多元醇为聚醚二元醇和/或聚醚三元醇,所述聚醚多元醇的相对分子质量为1000-5000。
3.如权利要求1所述的方法,其特征在于,所述异氰酸酯选自二苯基甲基二异氰酸酯和甲苯二异氰酸酯。
4.如权利要求1所述的方法,其特征在于,步骤2)中所述催化剂选自有机锡,三亚乙基二胺和三乙胺;步骤2)中还加入流平剂、耐老化剂和消泡剂。
5.如权利要求1所述的方法,其特征在于,步骤1)中还加入增塑剂和填料。
6.如权利要求4所述的方法,其特征在于,所述消泡剂为有机硅消泡剂。
7.如权利要求5所述的方法,其特征在于,所述增塑剂选自氯化石蜡、邻苯二甲酸二辛酯和邻苯二甲酸二丁酯,所述填料选自滑石粉,重钙,陶土,硫酸钡,钛白粉,高领土,铁红和炭黑。
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