CN103524694A - 水性环保湿强剂的制备方法及其应用 - Google Patents
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Abstract
本发明提供了一种水性环保湿强剂的制备方法,包括如下步骤:在氮气气氛中,将预糊化淀粉和溶剂混合,60-70℃下加入异氰酸酯进行反应,当体系中-NCO基团含量小于异氰酸酯重量的25wt%时,降温至0-5℃,加入封闭剂进行封闭反应至-NCO基团含量为零,既得淀粉-异氰酸酯预聚体;加水进行高速分散,加碱中和pH至7-8,既得所述水性环保湿强剂。本发明制备得到的水性环保湿强剂是一种无毒害绿色产品,用于纸张涂布,在白度不变的情况下,纸张的湿强度、抗张强度、撕裂度、耐折度等指标均有大幅度的提高。
Description
技术领域
本发明涉及一种水性环保湿强剂的制备方法及其应用。
背景技术
目前常用的湿强剂湿强效果较好,但是都有一些缺点。例如用量最大的阳离子型聚酰胺表氯醇高分子聚合物(PAE),湿强效果令人满意,但价格昂贵,与阴离子不相容,固化后不易降解,损纸回用困难。另外PAE中有机氯含量高,不利于环保。而三聚氰胺甲醛树脂(MF)、脲醛树脂(UF)由于有游离甲醛的危害,近年来国内外开始禁用,总之,由于传统的湿强剂树脂对环境的不良影响,日益引起人们的关注,造纸工业正在开发环境友好型湿强剂。
发明内容
本发明的目的是提供一种水性环保湿强剂的制备方法,以克服现有技术存在的上述缺陷。
本发明水性环保湿强剂的制备方法,包括如下步骤:
在氮气气氛中,将预糊化淀粉和溶剂混合,60-70℃下加入异氰酸酯进行反应,当体系中-NCO基团含量小于异氰酸酯重量的25wt%时,降温至0-5℃,加入封闭剂进行封闭反应至-NCO基团含量为零,既得淀粉-异氰酸酯预聚体;加水进行高速分散,加碱中和pH至7-8,既得所述水性环保湿强剂。
上述技术方案中各组分的重量份数如下:
水的加入量根据最终产物的固含量需要进行调节。
体系中的-NCO基团的含量按照二正丁胺法进行测定。
所述水性环保湿强剂为泛蓝光白色乳液,其固含量为30.0±2.0%。
所述预糊化淀粉采用本领域常规方法制备,通常的步骤如下:
淀粉---加水---形成淀粉浆---加热糊化-----干燥---粉碎。
所述淀粉选自玉米淀粉、小麦淀粉或木薯淀粉,优选木薯淀粉;
所述异氰酸酯选自甲苯二异氰酸酯、二苯甲烷二异氰酸酯、六次亚甲基二异氰酸酯或异佛尔酮二异氰酸酯中的至少一种;优选甲苯二异氰酸酯或二苯甲烷二异氰酸酯;
所述溶剂选自丙酮、丁酮、N,N-二甲基丙烯酰胺或乙酸乙酯中的至少一种;
所述的封闭剂为甲乙酮肟、丙酮肟或亚硫酸氢钠;
所述异氰酸酯的加入时间为20-30分钟,反应时间为2-4个小时;
本发明制备得到的水性环保湿强剂是一种无毒无害,绿色产品,用于纸张涂布,在白度不变的情况下,纸张的湿强度、抗张强度、撕裂度、耐折度等指标均有大幅度的提高。
具体实施方式
实施例1
(1)预糊化淀粉的制备:在装有搅拌、温度计、加水管道和冷凝管的四口烧瓶中,加入玉米淀粉200克,开启搅拌,在搅拌下加入水300克,搅拌均匀形成淀粉乳,在水浴中加入至90-95℃,糊化30分钟,冷却后,在150℃烘箱中干燥后,粉碎、过标准100目网筛,得预糊化淀粉;
(2)在装有冷凝管、搅拌、温度计和加料管道的四口烧瓶中,加入溶剂乙酸乙酯80份,加热升温至60℃,加入预糊化淀粉35份,搅拌均匀后,缓慢滴加40份的甲苯二异氰酸酯,30分钟滴加完毕,而后在此温度下开始反应,用二正丁胺法测体系中的-NCO含量,4个小时达到要求后,迅速移至0℃的水浴中,加入4份封闭剂甲乙酮肟进行封闭反应至-NCO为零,得淀粉-异氰酸酯预聚体;加入去离子水进行高速分散得到最终样品,加碱中和pH至8.0,为泛蓝光白色乳液,25℃的粘度12mPa.s(NDJ-1旋转粘度计测定),重量固含量为30.5%。
实施例2
(1)预糊化淀粉的制备:在装有搅拌、温度计、加水管道和冷凝管的四口烧瓶中,加入小麦淀粉200克,开启搅拌,在搅拌下加入水300克,搅拌均匀形成淀粉乳,在水浴中加入至90-95℃,糊化30分钟,冷却后,在150℃烘箱中干燥后,粉碎、过标准100目网筛,得预糊化淀粉;
(2)在装有冷凝管、搅拌、温度计和加料管道的四口烧瓶中,加入溶剂乙酸乙酯50份,加热升温至70℃,加入预糊化淀粉20份,搅拌均匀后,缓慢滴加20份的甲苯二异氰酸酯,20分钟滴加完毕,而后在此温度下开始反应,用二正丁胺法测体系中的-NCO含量,2个小时达到要求后,迅速移至0℃的水浴中,加入2份封闭剂甲乙酮肟进行封闭反应至-NCO为零,得淀粉-异氰酸酯预聚体;加入去离子水进行高速分散得到最终样品,加碱中和pH至7.5,为泛蓝光白色乳液,25℃的粘度9.8mPa.s(NDJ-1旋转粘度计测定),重量固含量为29.5%。
实施例3
(1)预糊化淀粉的制备:在装有搅拌、温度计、加水管道和冷凝管的四口烧瓶中,加入木薯淀粉200克,开启搅拌,在搅拌下加入水300克,搅拌均匀形成淀粉乳,在水浴中加入至90-95℃,糊化30分钟,冷却后,在150℃烘箱中干燥后,粉碎、过标准100目网筛,得预糊化淀粉;
(2)在装有冷凝管、搅拌、温度计和加料管道的四口烧瓶中,加入溶剂乙酸乙酯65份,加热升温至65℃,加入预糊化淀粉30份,搅拌均匀后,缓慢滴加30份的甲苯二异氰酸酯,25分钟滴加完毕,而后在此温度下开始反应,用二正丁胺法测体系中的-NCO含量,3个小时达到要求后,迅速移至0℃的水浴中,加入3份封闭剂甲乙酮肟进行封闭反应至-NCO为零,得淀粉-异氰酸酯预聚体;加入去离子水进行高速分散得到最终样品,加碱中和pH至7.0,为泛蓝光白色乳液,25℃的粘度9.8mPa.s(NDJ-1旋转粘度计测定),重量固含量为30.1%。
实施例4
将合成好的水性淀粉.TDI聚合乳液均匀的涂在空白的手抄片上,然后将纸样置于105度烘箱中烘干。
涂布纸各项物理指标检测如下表:
对比样为采用专利CN200610117336.1的方法制备的样品。
从以上结果可以看出:用于涂布,与对比样品相比,各项指标有明显提高。
Claims (7)
1.水性环保湿强剂的制备方法,其特征在于,包括如下步骤:在氮气气氛中,将预糊化淀粉和溶剂混合,60-70℃下加入异氰酸酯进行反应,当体系中-NCO基团含量小于异氰酸酯重量的25wt%时,降温至0-5℃,加入封闭剂进行封闭反应至-NCO基团含量为零,既得淀粉-异氰酸酯预聚体;加水进行高速分散,加碱中和pH至7-8,既得所述水性环保湿强剂。
2.根据权利要求1所述的方法,其特征在于,各组份重量份数如下:
3.根据权利要求1所述的方法,其特征在于,所述预糊化淀粉是采用玉米淀粉、小麦淀粉或木薯淀粉经糊化而成。
4.根据权利要求1所述的方法,其特征在于,所述异氰酸酯选自甲苯二异氰酸酯、二苯甲烷二异氰酸酯、六次亚甲基二异氰酸酯或异佛尔酮二异氰酸酯中的至少一种。
5.根据权利要求1所述的方法,其特征在于,所述溶剂选自丙酮、丁酮、N,N-二甲基丙烯酰胺或乙酸乙酯中的至少一种。
6.根据权利要求1所述的方法,其特征在于,所述的封闭剂为甲乙酮肟、丙酮肟或亚硫酸氢钠。
7.根据权利要求6所述的方法,其特征在于,所述异氰酸酯的加入时间为20-30分钟,反应时间为2-4个小时。
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CN106149479A (zh) * | 2015-04-21 | 2016-11-23 | 凯米罗总公司 | 强度组合物用于提高纸浆模制品的湿尺寸稳定性的用途 |
CN106490676A (zh) * | 2016-12-11 | 2017-03-15 | 钦州学院 | 一种淀粉质烟用保润剂及其制备方法 |
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Cited By (4)
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CN103866629A (zh) * | 2014-02-28 | 2014-06-18 | 苏州恒康新材料有限公司 | 一种造纸加工助剂及其制备方法 |
CN106149479A (zh) * | 2015-04-21 | 2016-11-23 | 凯米罗总公司 | 强度组合物用于提高纸浆模制品的湿尺寸稳定性的用途 |
CN106149479B (zh) * | 2015-04-21 | 2019-10-18 | 凯米罗总公司 | 强度组合物用于提高纸浆模制品的湿尺寸稳定性的用途 |
CN106490676A (zh) * | 2016-12-11 | 2017-03-15 | 钦州学院 | 一种淀粉质烟用保润剂及其制备方法 |
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