CN107189010A - 一种疏水改性聚丙烯酰胺的制备方法 - Google Patents
一种疏水改性聚丙烯酰胺的制备方法 Download PDFInfo
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Abstract
本发明属于水溶性高分子材料领域,特别是一种疏水改性聚丙烯酰胺的制备方法。本发明以丙烯酰胺和2‑丙烯酰胺基‑2‑甲基丙磺酸为单体,用失水山梨醇单月桂酸酯和辛基酚聚氧乙烯醚为乳化剂,煤油或环己烷为油相,化学引发或紫外光照射引发制备聚丙烯酰胺反相乳液,之后将含苯环的疏水改性试剂加入到上述反相乳液中改性,制得疏水改性聚丙烯酰胺反相乳液。本发明将聚丙烯酰胺反相乳液进行疏水改性,引入含苯环的疏水基团,不但使该聚丙烯酰胺的粘度显著提高,也使该聚丙烯酰胺的耐温抗盐能力大大增强。该发明制备的产品使用方便,成本低,易于工业化生产,具有较高的应用前景。
Description
技术领域
本发明涉及水溶性高分子材料领域,特别是一种疏水改性聚丙烯酰胺的制备方法。
背景技术
目前国内广泛使用的水溶性聚丙烯酰胺在低温低盐油田中进行驱油作业取得了良好的效果,但在高温高盐的环境下使用时,聚丙烯酰胺溶液的粘度损失严重,驱油效果变差,因此提高聚丙烯酰胺产品的耐温抗盐性能非常必要。聚丙烯酰胺通过化学改性在聚丙烯酰胺链段上引入少量耐温抗盐的疏水基团,在水溶液体系中疏水基团的疏水或缔合特性,使聚丙烯酰胺的长链线团在水溶液中形成拉伸的空间网状结构,流体力学体积增大,不但使该聚合物的粘度显著提高,也使该聚合物的耐温抗盐能力大大增强。
目前疏水缔合聚丙烯酰胺的主要生产方法为胶束共聚和反相乳液/反相微乳液共聚,这两种方法除了都要使用价格昂贵的疏水单体外,胶束共聚的产品由于疏水单体的影响,分子量不高。
CN101132756A专利公开了一种包含一种或多种疏水改性聚丙烯酰胺的组合物,是聚丙烯酰胺的酰胺基团与疏水胺发生转酰氨基反应,以生成疏水改性的聚丙烯酰胺,其中所述疏水胺选自C6-C22烷基胺和氨基官能化的硅氧烷组成的组成。201210311190.X专利公开了一种疏水缔合聚丙烯酰胺的合成方法,首先制备出聚丙烯酰胺反相乳液,再对其进行改性,引入长链烷基疏水基团和阳离子基团制备疏水缔合聚丙烯酰胺反相乳液,从而制备出非离子、阴离子、阳离子或两性疏水缔合聚丙烯酰胺反相乳液系列产品。本专利是在201210311190.X的基础上,用一种更简便的方法引入与上面2个专利不同的含苯环的基团,得到耐温抗盐的疏水改性聚丙烯酰胺。
发明内容
本发明的目的在于克服现有技术的不足,提供一种更简便、成本更低的疏水改性聚丙烯酰胺的制备方法。
一种疏水改性聚丙烯酰胺的制备方法,其特征是包括如下步骤:
在装有搅拌器、温度计、冷凝器和气体进出口的容器中,依次加入质量浓度为20-50%的丙烯酰胺水溶液,按所需要的阴离子度加入占丙烯酰胺摩尔量0-50%的2-丙烯酰胺基-2-甲基丙磺酸,用质量浓度为10-50%的氢氧化钠水溶液调节系统的pH值为3-7,再加入占单体总质量20-40%的一定比例的失水山梨醇单月桂酸酯和辛基酚聚氧乙烯醚作为乳化剂。开启搅拌,直到反应物混合均匀,然后加入占丙烯酰胺水溶液体积60-120%的煤油或环己烷,通氮气或二氧化碳驱氧,控制温度为5-35℃,搅拌20-40min,化学引发或紫外光照射引发聚合反应,反应结束后得到聚丙烯酰胺反相乳液。之后将占总单体量为0.5-2mol%的疏水改性试剂加入到上述反相乳液中强力搅拌,加入一定量的酸作催化剂,反应温度10-60℃,反应时间4-36h,之后用氢氧化钠水溶液中和加入的酸,制得疏水改性聚丙烯酰胺反相乳液。
主要特征步骤中,疏水改性试剂为n-羟甲基苯甲酰胺、n-羟甲基邻苯二甲酰亚胺或n-甲基-n-羟乙基苄胺中的一种。
主要特征步骤中,加入的催化剂酸为所用的酸为盐酸、硫酸、硝酸、醋酸或磷酸中的一种。
本发明采用反相乳液聚合法得到聚丙烯酰胺反相乳液产品,之后加入疏水改性试剂,对制备的反相乳液进行改性,得到疏水改性的聚丙烯酰胺反相乳液产品,产品可广泛应用于传统聚丙烯酰胺但性能欠佳的领域,特别是在油田助剂、水处理、造纸助留和化妆品等方面。
具体实施方式
下面给出本发明的二个最佳实施例:
实施例一
在带有搅拌器、温度计、冷凝器和气体进出口的500ml四口烧瓶中依次加入43wt%的丙烯酰胺水溶液100g、乳化剂脱水山梨醇单月桂酸酯10g和辛基酚聚氧乙烯醚2.5g,搅拌10min后,加入煤油100ml,控制水浴温度25℃搅拌30min,同时通二氧化碳以除去系统中的氧气。加1%的过硫酸铵水溶液0.1ml和5%的亚硫酸氢钠水溶液0.5ml引发,升至最高温度后,60℃保温反应1h,制得非离子聚丙烯酰胺反相乳液。然后在此非离子聚丙烯酰胺反相乳液中加入n-羟甲基苯甲酰胺5g,控制温度在40℃左右,滴加乙酸5ml,反应约10h,然后缓慢加入50%的氢氧化钠水溶液6.6ml中和,制得疏水改性非离子聚丙烯酰胺反相乳液。该乳液可以直接应用,也可以用丙酮、乙醇或甲醇沉出干燥后以干粉形式出售。
实施例二
在带有搅拌器、温度计、冷凝器和气体进出口的500ml四口烧瓶中依次加入43wt%的丙烯酰胺水溶液60g、乳化剂脱水山梨醇单月桂酸酯10g和辛基酚聚氧乙烯醚2.5g,搅拌10min后,加入25g 2-丙烯酰胺基-2-甲基丙磺酸,用15%的氢氧化钠水溶液调节系统的pH值为5.0。搅拌20min后,加入环己烷100ml,控制水浴温度25℃搅拌30min,同时通高纯氮气以除去系统中的氧气。加入安息香(1mg在0.1ml冰醋酸中),用250W的高压汞灯照射体系使之引发,待升至最高温度后,60℃保温反应1h,制得阴离子聚丙烯酰胺反相乳液。在此阴离子聚丙烯酰胺反相乳液中加入n-羟甲基邻苯二甲酰亚胺5g,控制温度在40℃左右,滴加浓硫酸3ml,反应约10h,然后缓慢加入50%的氢氧化钠水溶液5ml中和,制得疏水改性阴离子聚丙烯酰胺反相乳液。该乳液可以直接应用,也可以用丙酮、乙醇或甲醇沉出干燥后以干粉形式出售。
Claims (2)
1.一种疏水改性聚丙烯酰胺的制备方法,其特征是包括如下步骤:
(1)在装有搅拌器、温度计、冷凝器和气体进出口的容器中,依次加入质量浓度为20-50%的丙烯酰胺水溶液,按所需要的阴离子度加入占丙烯酰胺摩尔量0-50%的2-丙烯酰胺基-2-甲基丙磺酸,用质量浓度为10-50%的氢氧化钠水溶液调节系统的pH值为3-7,再加入占单体总质量20-40%的一定比例的失水山梨醇单月桂酸酯和辛基酚聚氧乙烯醚作为乳化剂;
(2)开启搅拌,直到反应物混合均匀,然后加入占丙烯酰胺水溶液体积60-120%的煤油或环己烷,通氮气或二氧化碳驱氧,控制温度为5-35℃,搅拌20-40min,化学引发或紫外光照射引发聚合反应,反应结束后得到聚丙烯酰胺反相乳液;
(3)将占总单体量为0.5-2mol%的疏水改性试剂加入到步骤(2)制备的反相乳液中强力搅拌,加入酸作催化剂,反应温度10-60℃,反应时间4-36h,之后用氢氧化钠水溶液中和加入的酸,制得疏水改性聚丙烯酰胺反相乳液。
2.根据权利要求1所述的一种疏水改性聚丙烯酰胺的制备方法,其特征是步骤(3)中,疏水改性试剂为n-羟甲基苯甲酰胺、n-羟甲基邻苯二甲酰亚胺或n-甲基-n-羟乙基苄胺中的一种;加入的酸作催化剂为盐酸、硫酸、硝酸、醋酸或磷酸中的一种。
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