CN106947426A - 一种建筑用耐候型密封胶的制备方法 - Google Patents
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Abstract
本发明公开了一种建筑用耐候型密封胶的制备方法,属于密封材料的技术领域。本发明先将两种不同的聚醚多元醇混合,并真空加热脱除气泡和水,随后加入异氰酸丙基三乙氧基硅烷和二月桂酸二丁基锡,抽真空后加热制得端硅烷改性聚氨酯预聚体,接着利用油酸对纳米碳酸钙进行表面处理,优化其高蔽光性和高亮度,改善产品的白度和力学性能,最后将端硅烷改性聚氨酯预聚体、聚丙二醇和改性纳米碳酸钙等真空搅拌,随后加入烯基三甲氧基硅烷、抗氧化剂等即可得建筑用耐候型密封胶,本发明所得的密封胶可长期耐热,不易受紫外线光照老化,固化快,在高温高湿环境下胶层不发泡,耐水性及耐候性好,能满足建筑装饰用胶的高性能要求。
Description
技术领域
本发明公开了一种建筑用耐候型密封胶的制备方法,属于密封材料的技术领域。
背景技术
现代建筑师在进行建筑设计过程中已经把人与自然的交流,人的视觉效果放到了一个非常重要的地位,玻璃幕墙和采光顶因其“光、薄、透”的特点,已成为现代建筑的一个重要部分。采光顶、点支式幕墙等大多采用透明白玻和银色的铝合金型材,若配套使用有颜色的密封胶,则会影响幕墙的整体效果和人的视觉美观,中性透明密封胶恰能弥补其不足。
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。通常以沥青物、天然树脂或合成树脂、天然橡胶或合成橡胶等干性或非干性的粘稠物为基料,配合滑石粉、白土、炭黑、钛白粉和石棉等惰性填料,再加入增塑剂、溶剂、固化剂、促进剂等制成。可分为弹性密封胶、液体密封垫料和密封腻子三大类。广泛用于建筑、交通运输、电子仪器仪表及零部件的密封。目前所生产的密封胶具有优良的耐磨性、低温柔软性、性能可调节范围较广,机械强度大,弹性好,具有优良的复原性,可适合于动态接缝;耐油性能优良,耐生物老化,价格适中的特点。但不能长期耐热,浅色配方容易受紫外线光照老化,通常固化较慢,对无孔材料的粘接需要以底胶进行表面处理,高温高湿环境下容易引起胶层的发泡,耐水性差,粘结性能不好。因此研究出一种固化速度快,耐水性好,粘结性能优良,使用不易发泡的密封胶,在相关领域具有很好的发展前景和社会价值。
发明内容
本发明所要解决的技术问题:针对目前使用的密封胶不能长期耐热,易受紫外线光照老化,固化较慢,在高温高湿环境下容易引起胶层的发泡,耐水性差,粘结性能不好的缺陷,提供了一种建筑用耐候型密封胶的方法,本发明先将两种不同的聚醚多元醇混合,并真空加热脱除气泡和水,随后加入异氰酸丙基三乙氧基硅烷和二月桂酸二丁基锡,抽真空后加热制得端硅烷改性聚氨酯预聚体,接着利用油酸对纳米碳酸钙进行表面处理,优化其高蔽光性和高亮度,改善产品的白度和力学性能,最后将端硅烷改性聚氨酯预聚体、聚丙二醇和改性纳米碳酸钙等真空搅拌,随后加入烯基三甲氧基硅烷、抗氧化剂等即可得建筑用耐候型密封胶,本发明所得的密封胶可长期耐热,不易受紫外线光照老化,固化快,在高温高湿环境下胶层不发泡,耐水性及耐候性好,能满足建筑装饰用胶的高性能要求。
为解决上述技术问题,本发明采用如下所述的技术方案是:
(1)量取50~60mL聚醚多元醇2000,50~60mL聚醚多元醇3000,装入高压反应器中,以300~400r/min搅拌20~30min,随后密封并抽真空至反应器内真空度为100~300Pa,再加热至110~120℃预处理2~3h,冷却至室温后,得预处理复合聚醚多元醇;
(2)向上述预处理复合聚醚多元醇中加入160~240mL异氰酸丙基三乙氧基硅烷,3.0~3.6mL二月桂酸二丁基锡,并抽真空至反应器内真空度为10~100Pa,随后通入氮气至釜内压力为3~5kPa,并加热至75~80℃,保持温度反应6~8h,冷却至室温后出料,得端硅烷改性聚氨酯预聚体,备用;
(3)称取200~300g纳米碳酸钙,加入500~600mL无水乙醇中,以300~400r/min搅拌15~20min,再加入7~10mL油酸,并加热至60~70℃,继续搅拌2~3h,冷却至室温后过滤,用无水乙醇洗涤滤渣2~3次,随后将滤渣转入干燥箱中,在120~150℃下干燥2~3h,得改性纳米碳酸钙;
(4)按重量份数计,称取100~120份步骤(2)制备的端硅烷改性聚氨酯预聚体,60~80份聚丙二醇,120~150份上述改性纳米碳酸钙,20~30份气相白炭黑,装入行星搅拌机中,真空搅拌20~30min,再加入6~8份乙烯基三甲氧基硅烷,4~5份硅烷偶联剂KH-550,0.3~0.5份二月桂酸二丁基锡,0.3~0.5份抗氧化剂1010,继续真空搅拌20~30min,随后出料得建筑用耐候型密封胶。本发明的应用方法是:首先将待涂表面的浮灰、油污等清洁干净,并在涂胶部位的两侧贴上保护胶带,保持空间温度为15~35℃,湿度为55~75%,随后将本发明所得的建筑用耐候型密封胶装入胶瓶,套上管嘴并将胶瓶套进胶枪,接着在涂胶部位挤上一层密封胶,用沾湿的手指轻抹于胶体表面使之光滑,最后撕去涂胶部位两侧的保护胶带,固化1~3h即可,经检测,本发明所得的建筑用耐候型密封胶的拉伸强度为15.5~19.5MPa,扯断伸长率为360~440%,表干时间为8~10min,可使用的温度范围为-50~250℃。
本发明与其他方法相比,有益技术效果是:
(1)本发明所得的建筑用耐候型密封胶可长期耐热,不易受紫外线光照老化,固化快,耐水性及耐候性能好,能满足建筑装饰用胶的高性能要求;
(2)本发明所得的建筑用耐候型密封胶在高温高湿环境下胶层不发泡,具有良好的粘结效果,制备工艺简单,所需成本低,使用方便,值得推广使用。
具体实施方式
量取50~60mL聚醚多元醇2000,50~60mL聚醚多元醇3000,装入高压反应器中,以300~400r/min搅拌20~30min,随后密封并抽真空至反应器内真空度为100~300Pa,再加热至110~120℃预处理2~3h,冷却至室温后,得预处理复合聚醚多元醇;向上述预处理复合聚醚多元醇中加入160~240mL异氰酸丙基三乙氧基硅烷,3.0~3.6mL二月桂酸二丁基锡,并抽真空至反应器内真空度为10~100Pa,随后通入氮气至釜内压力为3~5kPa,并加热至75~80℃,保持温度反应6~8h,冷却至室温后出料,得端硅烷改性聚氨酯预聚体,备用;称取200~300g纳米碳酸钙,加入500~600mL无水乙醇中,以300~400r/min搅拌15~20min,再加入7~10mL油酸,并加热至60~70℃,继续搅拌2~3h,冷却至室温后过滤,用无水乙醇洗涤滤渣2~3次,随后将滤渣转入干燥箱中,在120~150℃下干燥2~3h,得改性纳米碳酸钙;按重量份数计,称取100~120份制备的端硅烷改性聚氨酯预聚体,60~80份聚丙二醇,120~150份上述改性纳米碳酸钙,20~30份气相白炭黑,装入行星搅拌机中,真空搅拌20~30min,再加入6~8份乙烯基三甲氧基硅烷,4~5份硅烷偶联剂KH-550,0.3~0.5份二月桂酸二丁基锡,0.3~0.5份抗氧化剂1010,继续真空搅拌20~30min,随后出料得建筑用耐候型密封胶。
实例1
量取50mL聚醚多元醇2000,50mL聚醚多元醇3000,装入高压反应器中,以300r/min搅拌20min,随后密封并抽真空至反应器内真空度为100Pa,再加热至110℃预处理2h,冷却至室温后,得预处理复合聚醚多元醇;向上述预处理复合聚醚多元醇中加入160mL异氰酸丙基三乙氧基硅烷,3.0mL二月桂酸二丁基锡,并抽真空至反应器内真空度为10Pa,随后通入氮气至釜内压力为3kPa,并加热至75℃,保持温度反应6h,冷却至室温后出料,得端硅烷改性聚氨酯预聚体,备用;称取200g纳米碳酸钙,加入500mL无水乙醇中,以300r/min搅拌15min,再加入7mL油酸,并加热至60℃,继续搅拌2h,冷却至室温后过滤,用无水乙醇洗涤滤渣2次,随后将滤渣转入干燥箱中,在120℃下干燥2h,得改性纳米碳酸钙;按重量份数计,称取100份制备的端硅烷改性聚氨酯预聚体,60份聚丙二醇,120份上述改性纳米碳酸钙,20份气相白炭黑,装入行星搅拌机中,真空搅拌20min,再加入6份乙烯基三甲氧基硅烷,4份硅烷偶联剂KH-550,0.3份二月桂酸二丁基锡,0.3份抗氧化剂1010,继续真空搅拌20min,随后出料得建筑用耐候型密封胶。
首先将待涂表面的浮灰、油污等清洁干净,并在涂胶部位的两侧贴上保护胶带,保持空间温度为15℃,湿度为55%,随后将本发明所得的建筑用耐候型密封胶装入胶瓶,套上管嘴并将胶瓶套进胶枪,接着在涂胶部位挤上一层密封胶,用沾湿的手指轻抹于胶体表面使之光滑,最后撕去涂胶部位两侧的保护胶带,固化1h即可,经检测,本发明所得的建筑用耐候型密封胶的拉伸强度为15.5MPa,扯断伸长率为360%,表干时间为8min,可使用的温度为-50℃。
实例2
量取60mL聚醚多元醇2000,60mL聚醚多元醇3000,装入高压反应器中,以400r/min搅拌30min,随后密封并抽真空至反应器内真空度为300Pa,再加热至120℃预处理3h,冷却至室温后,得预处理复合聚醚多元醇;向上述预处理复合聚醚多元醇中加入240mL异氰酸丙基三乙氧基硅烷,3.6mL二月桂酸二丁基锡,并抽真空至反应器内真空度为100Pa,随后通入氮气至釜内压力为5kPa,并加热至80℃,保持温度反应8h,冷却至室温后出料,得端硅烷改性聚氨酯预聚体,备用;称取300g纳米碳酸钙,加入600mL无水乙醇中,以400r/min搅拌20min,再加入10mL油酸,并加热至70℃,继续搅拌3h,冷却至室温后过滤,用无水乙醇洗涤滤渣3次,随后将滤渣转入干燥箱中,在150℃下干燥3h,得改性纳米碳酸钙;按重量份数计,称取120份制备的端硅烷改性聚氨酯预聚体,80份聚丙二醇,150份上述改性纳米碳酸钙,30份气相白炭黑,装入行星搅拌机中,真空搅拌30min,再加入8份乙烯基三甲氧基硅烷,5份硅烷偶联剂KH-550,0.5份二月桂酸二丁基锡,0.5份抗氧化剂1010,继续真空搅拌30min,随后出料得建筑用耐候型密封胶。
首先将待涂表面的浮灰、油污等清洁干净,并在涂胶部位的两侧贴上保护胶带,保持空间温度为35℃,湿度为75%,随后将本发明所得的建筑用耐候型密封胶装入胶瓶,套上管嘴并将胶瓶套进胶枪,接着在涂胶部位挤上一层密封胶,用沾湿的手指轻抹于胶体表面使之光滑,最后撕去涂胶部位两侧的保护胶带,固化3h即可,经检测,本发明所得的建筑用耐候型密封胶的拉伸强度为19.5MPa,扯断伸长率为440%,表干时间为10min,可使用的温度为250℃。
实例3
量取55mL聚醚多元醇2000,55mL聚醚多元醇3000,装入高压反应器中,以350r/min搅拌25min,随后密封并抽真空至反应器内真空度为200Pa,再加热至115℃预处理2.5h,冷却至室温后,得预处理复合聚醚多元醇;向上述预处理复合聚醚多元醇中加入200mL异氰酸丙基三乙氧基硅烷,3.3mL二月桂酸二丁基锡,并抽真空至反应器内真空度为55Pa,随后通入氮气至釜内压力为4kPa,并加热至77℃,保持温度反应7h,冷却至室温后出料,得端硅烷改性聚氨酯预聚体,备用;称取250g纳米碳酸钙,加入550mL无水乙醇中,以350r/min搅拌17min,再加入8mL油酸,并加热至65℃,继续搅拌2.5h,冷却至室温后过滤,用无水乙醇洗涤滤渣2次,随后将滤渣转入干燥箱中,在135℃下干燥2.5h,得改性纳米碳酸钙;按重量份数计,称取110份制备的端硅烷改性聚氨酯预聚体,70份聚丙二醇,135份上述改性纳米碳酸钙,25份气相白炭黑,装入行星搅拌机中,真空搅拌25min,再加入7份乙烯基三甲氧基硅烷,4份硅烷偶联剂KH-550,0.4份二月桂酸二丁基锡,0.4份抗氧化剂1010,继续真空搅拌25min,随后出料得建筑用耐候型密封胶。
首先将待涂表面的浮灰、油污等清洁干净,并在涂胶部位的两侧贴上保护胶带,保持空间温度为25℃,湿度为65%,随后将本发明所得的建筑用耐候型密封胶装入胶瓶,套上管嘴并将胶瓶套进胶枪,接着在涂胶部位挤上一层密封胶,用沾湿的手指轻抹于胶体表面使之光滑,最后撕去涂胶部位两侧的保护胶带,固化2h即可,经检测,本发明所得的建筑用耐候型密封胶的拉伸强度为17.5MPa,扯断伸长率为400%,表干时间为9min,可使用的温度为100℃。
Claims (1)
1.一种建筑用耐候型密封胶的制备方法,其特征在于具体制备步骤为:
(1)量取50~60mL聚醚多元醇2000,50~60mL聚醚多元醇3000,装入高压反应器中,以300~400r/min搅拌20~30min,随后密封并抽真空至反应器内真空度为100~300Pa,再加热至110~120℃预处理2~3h,冷却至室温后,得预处理复合聚醚多元醇;
(2)向上述预处理复合聚醚多元醇中加入160~240mL异氰酸丙基三乙氧基硅烷,3.0~3.6mL二月桂酸二丁基锡,并抽真空至反应器内真空度为10~100Pa,随后通入氮气至釜内压力为3~5kPa,并加热至75~80℃,保持温度反应6~8h,冷却至室温后出料,得端硅烷改性聚氨酯预聚体,备用;
(3)称取200~300g纳米碳酸钙,加入500~600mL无水乙醇中,以300~400r/min搅拌15~20min,再加入7~10mL油酸,并加热至60~70℃,继续搅拌2~3h,冷却至室温后过滤,用无水乙醇洗涤滤渣2~3次,随后将滤渣转入干燥箱中,在120~150℃下干燥2~3h,得改性纳米碳酸钙;
(4)按重量份数计,称取100~120份步骤(2)制备的端硅烷改性聚氨酯预聚体,60~80份聚丙二醇,120~150份上述改性纳米碳酸钙,20~30份气相白炭黑,装入行星搅拌机中,真空搅拌20~30min,再加入6~8份乙烯基三甲氧基硅烷,4~5份硅烷偶联剂KH-550,0.3~0.5份二月桂酸二丁基锡,0.3~0.5份抗氧化剂1010,继续真空搅拌20~30min,随后出料得建筑用耐候型密封胶。
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