CN106543952A - 一种耐低温外墙石材填缝聚氨酯建筑密封胶及其制备方法 - Google Patents

一种耐低温外墙石材填缝聚氨酯建筑密封胶及其制备方法 Download PDF

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CN106543952A
CN106543952A CN201610959296.9A CN201610959296A CN106543952A CN 106543952 A CN106543952 A CN 106543952A CN 201610959296 A CN201610959296 A CN 201610959296A CN 106543952 A CN106543952 A CN 106543952A
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刘晓朋
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Abstract

本发明公开了一种耐低温外墙石材填缝聚氨酯建筑密封胶，其是由下述重量份的原料制得：高岭土30‑40，滑石粉15‑25，木质素20‑40，聚氧化丙烯二醇100‑120，异佛尔酮二异氰酸酯30‑60，固含量为40‑50%的硅丙乳液5‑10，二月桂酸二丁基锡0.5‑1，羧甲基纤维素钠3‑5，氨丙基三乙氧基硅烷3‑5，正硅酸乙酯1.5‑2.5，癸二酸二丁酯15‑25，邻苯二甲酸二辛酯30‑40，聚乙烯醇缩丁醛3‑5。本发明的聚氨酯建筑密封胶既具有优良的耐候性、粘接性能以及高稳定性，耐久性好，使用寿命长，还有耐低温的特点，适合用于寒冷地区外墙石材填缝使用。

Description

一种耐低温外墙石材填缝聚氨酯建筑密封胶及其制备方法
技术领域
本发明涉及密封胶技术领域，尤其涉及一种耐低温外墙石材填缝聚氨酯建筑密封胶及其制备方法。
背景技术
密封胶是指引随密封面形状而变形，不易流淌，有一定粘结性的密封材料，是用来填充构形间隙、以起到密封作用的胶粘剂，具有防泄漏、防水、防振动及隔音、隔热等作用。建筑的***护、室内装饰装修、窗结构以及其它形式的围护和装饰结构是由单元组成，而单元之间产生的接缝绝大多数需要建筑用密封胶来密封填充。合理的建筑用密封胶选材和建筑密封的正确施工是保证建筑接缝密封成功必不可少的环节。
聚氨酯密封胶具有设备、工艺简单、无污染、粘接强度高、快速固化、施工方便等优点，在建筑领域得到广泛的应用。然而，现有的聚氨酯密封胶的耐候性较差，容易受紫外光老化，影响了其性能和使用寿命。CN201310164862公布了一种含木质素的聚氨酯密封胶，通过木质素替代三元醇合成聚氨酯密封胶，有效提高材料的耐光老化性能。然而在聚氨酯密封胶中引入木质素增加了密封胶的吸潮性，从而影响密封胶的稳定性。因此，有必要对其进行改进。
发明内容
本发明目的就是为了弥补已有技术的缺陷，提供一种具有优良耐候性以及高稳定性的耐低温外墙石材填缝聚氨酯建筑密封胶及其制备方法。
本发明是通过以下技术方案实现的：
一种耐低温外墙石材填缝聚氨酯建筑密封胶，其是由下述重量份的原料制得：
高岭土30-40，滑石粉15-25，木质素20-40，聚氧化丙烯二醇100-120，异佛尔酮二异氰酸酯30-60，固含量为40-50%的硅丙乳液5-10，二月桂酸二丁基锡0.5-1，羧甲基纤维素钠3-5，氨丙基三乙氧基硅烷3-5，正硅酸乙酯1.5-2.5，癸二酸二丁酯15-25，邻苯二甲酸二辛酯30-40，聚乙烯醇缩丁醛3-5；
所述聚氧化丙烯二醇的数均分子量为2000-6000；
所述木质素为玉米秸秆木质素。
一种耐低温外墙石材填缝聚氨酯建筑密封胶的制备方法，包括以下步骤：
（1）按重量称取原料，先将木质素溶解于聚氧化丙烯二醇中50-60℃加热处理2-4h，再于100-120℃真空除水1.5-2.5h，保持温度不变，加入氨丙基三乙氧基硅烷和正硅酸乙酯搅拌0.5-1h，得到复合聚氨酯预聚体；
（2）将高岭土和滑石粉混合后按固液重量比1:1-1:1.5与水混合，加入硅丙乳液和羧甲基纤维素钠搅拌10-15min，将得到的浆料进行喷雾干燥，其中喷雾干燥进风温度控制在160-180℃，得复合填料；
（3）先将步骤（1）中的复合聚氨酯预聚体与步骤（2）中的复合填料与50-60℃混合搅拌0.5-1h，然后加入其余原料80-90℃搅拌0.5-1h，即得耐低温外墙石材填缝聚氨酯建筑密封胶。
本发明的优点是：
本发明通过向聚氨酯密封胶中引入木质素、氨丙基三乙氧基硅烷和正硅酸乙酯得到有机-无机杂化聚氨酯密封胶，利用木质素与硅氧网络相交联，既有效改善了材料的耐光老化性能，又能减少吸潮，提高材料的粘结强度和耐久性，同时，利用其余原料的复配与增效，使得到的聚氨酯建筑密封胶既具有优良的耐候性、粘接性能以及高稳定性，耐久性好，使用寿命长，还有耐低温的特点，适合用于寒冷地区外墙石材填缝使用。
具体实施方式
一种耐低温外墙石材填缝聚氨酯建筑密封胶，由下列重量(kg)的组分原料制备而成：
高岭土30，滑石粉15，木质素20，聚氧化丙烯二醇100，异佛尔酮二异氰酸酯30，固含量为40%的硅丙乳液5，二月桂酸二丁基锡0.5，羧甲基纤维素钠3，氨丙基三乙氧基硅烷3，正硅酸乙酯1.5，癸二酸二丁酯15，邻苯二甲酸二辛酯30，聚乙烯醇缩丁醛3；
所述聚氧化丙烯二醇的数均分子量为2000；
所述木质素为玉米秸秆木质素。
一种耐低温外墙石材填缝聚氨酯建筑密封胶的制备方法，包括以下步骤：
（1）按重量称取原料，先将木质素溶解于聚氧化丙烯二醇中50℃加热处理2h，再于100℃真空除水1.5h，保持温度不变，加入氨丙基三乙氧基硅烷和正硅酸乙酯搅拌0.5h，得到复合聚氨酯预聚体；
（2）将高岭土和滑石粉混合后按固液重量比1:1与水混合，加入硅丙乳液和羧甲基纤维素钠搅拌10min，将得到的浆料进行喷雾干燥，其中喷雾干燥进风温度控制在160℃，得复合填料；
（3）先将步骤（1）中的复合聚氨酯预聚体与步骤（2）中的复合填料与50℃混合搅拌0.5h，然后加入其余原料80℃搅拌0.5h，即得耐低温外墙石材填缝聚氨酯建筑密封胶。
上述制得的密封胶性能测试结果如下：
拉伸强度：3.9MPa；
断裂伸长率：682%；
抗渗性：2.6MPa。

Claims (2)

1.一种耐低温外墙石材填缝聚氨酯建筑密封胶，其特征在于，其是由下述重量份的原料制得：
高岭土30-40，滑石粉15-25，木质素20-40，聚氧化丙烯二醇100-120，异佛尔酮二异氰酸酯30-60，固含量为40-50%的硅丙乳液5-10，二月桂酸二丁基锡0.5-1，羧甲基纤维素钠3-5，氨丙基三乙氧基硅烷3-5，正硅酸乙酯1.5-2.5，癸二酸二丁酯15-25，邻苯二甲酸二辛酯30-40，聚乙烯醇缩丁醛3-5；
所述聚氧化丙烯二醇的数均分子量为2000-6000；
所述木质素为玉米秸秆木质素。
2.根据权利要求1所述的一种耐低温外墙石材填缝聚氨酯建筑密封胶的制备方法，其特征在于，包括以下步骤：
（1）按重量称取原料，先将木质素溶解于聚氧化丙烯二醇中50-60℃加热处理2-4h，再于100-120℃真空除水1.5-2.5h，保持温度不变，加入氨丙基三乙氧基硅烷和正硅酸乙酯搅拌0.5-1h，得到复合聚氨酯预聚体；
（2）将高岭土和滑石粉混合后按固液重量比1:1-1:1.5与水混合，加入硅丙乳液和羧甲基纤维素钠搅拌10-15min，将得到的浆料进行喷雾干燥，其中喷雾干燥进风温度控制在160-180℃，得复合填料；
（3）先将步骤（1）中的复合聚氨酯预聚体与步骤（2）中的复合填料与50-60℃混合搅拌0.5-1h，然后加入其余原料80-90℃搅拌0.5-1h，即得耐低温外墙石材填缝聚氨酯建筑密封胶。
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CN117946605A (zh) * 2024-03-27 2024-04-30 众冶(辽宁)新材料技术研究有限公司 一种冶金粉体用粘合剂及其制备方法和应用

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