CN116874694B - 一种纸板用羧基丁苯胶乳及其制备方法 - Google Patents
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Abstract
本发明公开了一种纸板用羧基丁苯胶乳及其制备方法,本发明利用含双键的离子液体对膨润土进行改性,增加了膨润土与羧基丁苯胶乳之间的结合强度,进而提高了羧基丁苯胶乳的粘结性能;同时膨润土与羧基丁苯胶乳基体之间进行交联反应,提高了胶粒的抗形变能力,从而提高了胶乳的稳定性;此外,离子液体基团的引入,能有效抑制刚性和有序氢键网络的形成,释放更多能在界面处形成氢键的氢键供体/受体,进而提高界面粘附强度,从而进一步提高了羧基丁苯胶乳的粘结性能;将魔芋胶加入到胶乳中,增加了胶乳的黏度,同时能够使物系保持均匀稳定的乳浊状态,魔芋胶和离子液体改性膨润土共同作用,提高了羧基丁苯胶乳的稳定性。
Description
技术领域
本发明涉及胶乳制备技术领域,具体涉及一种纸板用羧基丁苯胶乳及其制备方法。
背景技术
胶乳是聚合物微粒分散于水中形成的胶体乳液,可直接用于表面涂层、制造薄膜和胶粘剂等,广泛应用于日常生活中。胶乳可分为天然胶乳、合成胶乳两大类,天然胶乳的特点是内聚力大,自粘性高,成膜性好,可随意调节黏度等,但由于其大分子链极性小,故与被粘物,尤其是极性大的被粘物黏着性差,其耐老化性、耐油性、耐化学药品性、耐温性、抗冻性相对较差。
丁苯胶乳(SBL)通常采用水分子作为溶剂,没有挥发性危险化学品,在和木基结合过程中可以达到零甲醛的释放,符合目前的环保理念,并以低成本、高强度和易改性等优点成为传统树脂的替代品。羧基丁苯胶乳(XSBL),是在SBL链中加入丙烯酸(AA)构建新的离子超分子杂化网络胶乳,在引入羧基后,其弹性范围、强度、与聚合物和功能性填料的相容性、耐碳氢化合物、抗溶剂性均得到一定程度的增强,其塑化后具有较好的力学性能、弹性和耐磨性而受到工业届的重视。
但是,目前工业上对羧基丁苯胶乳的稳定性、流动性要求比较高,现有技术制备合成的羧基丁苯胶乳仍与实际的要求有一定的差距;中国专利文献CN201010240404.X公开了一种羧基丁苯胶乳的制备方法,该专利提出在丁苯胶乳生产过程中加入一定膨润土,共同反应制备羧基丁苯胶乳,膨润土微粒作为胶乳的核,丁二烯、苯乙烯在膨润土表面接枝聚合,形成核壳结构的羧基丁苯胶乳,该专利中,膨润土链结增加丁苯胶乳之间的结合强度,提高了胶乳的粘结性能;膨润土具有较好的吸水膨胀性,在静止状态下,膨润土吸水润涨,提高了涂料的粘度,即提高了涂料的稳定性,但是该专利没有解决膨润土在胶乳中分散性不佳的问题,导致胶乳的稳定性和流动性能不佳。
发明内容
针对现有技术的不足,本发明的目的在于提供一种纸板用羧基丁苯胶乳及其制备方法,所制备得到的羧基丁苯胶乳具有良好的稳定性能和粘结强度。
为了实现上述目的,本发明采取如下技术方案:
一种纸板用羧基丁苯胶乳的制备方法,包括如下步骤:
S1、将膨润土加入到乙醇溶剂中,超声分散均匀,向其中加入含双键的离子液体,搅拌分散3-5h,然后静置、抽滤、干燥、研磨,得到离子液体改性膨润土;
S2、将离子液体改性膨润土、魔芋胶、十二烷基硫酸钠和叔十二碳硫醇加入到去离子水中,搅拌均匀,通入氮气排出空气,然后向其中加入丁二烯、苯乙烯、不饱和羧酸,搅拌升温至60-70℃,加入引发剂,进行反应,待反应结束后,得到分散液;
S3、将分散液降至室温,进行物理脱气,即得到羧基丁苯胶乳。
优选的,步骤S1中,膨润土和含双键的离子液体的质量比为10-20:2-4。
优选的,步骤S1中,所述含双键的离子液体选自1-乙烯基-3-丁基咪唑六氟磷酸盐、1-乙烯基-3-乙基咪唑四氟硼酸盐或1-烯丙基-3-乙基咪唑六氟磷酸盐。
优选的,步骤S2中,离子液体改性膨润土、魔芋胶、十二烷基硫酸钠、叔十二碳硫醇、去离子水、丁二烯、苯乙烯、不饱和羧酸和引发剂的质量比为5-10:1-2:1-3:1-2:100-150:15-20:20-25:5-10:0.5-1。
优选的,步骤S2中,所述不饱和羧酸选自丙烯酸或甲基丙烯酸。
优选的,步骤S2中,所述引发剂为过硫酸钠、过硫酸钾或过硫酸铵。
优选的,步骤S2中,反应时间为2-3h。
本发明提供由上述制备方法所制备得到的羧基丁苯胶乳。
本发明还提供上述羧基丁苯胶乳用于胶乳粘合剂或纸板表面施胶。
与现有技术相比,本发明具有如下有益效果:
(1)本发明利用含双键的离子液体对膨润土进行改性,通过含双键的离子液体和膨润土之间的物理吸附作用,将含双键的离子液体附着在膨润土的表面和层间,改善了膨润土在羧基丁苯胶乳基体中的分散性能,同时含双键的离子液体与羧基丁苯胶乳基体之间发生双键加成反应,增加了膨润土与羧基丁苯胶乳之间的结合强度,进而提高了羧基丁苯胶乳的粘结性能;同时膨润土与羧基丁苯胶乳基体之间进行交联反应,提高了胶粒的抗形变能力,从而提高了胶乳的稳定性;此外,离子液体基团的引入,能有效抑制刚性和有序氢键网络的形成,释放更多能在界面处形成氢键的氢键供体/受体,进而提高界面粘附强度,从而进一步提高了羧基丁苯胶乳的粘结性能。
(2)本发明提供的魔芋胶是一种高分子多糖,将其加入到胶乳中,增加了胶乳的黏度,同时能够使物系保持均匀稳定的乳浊状态,魔芋胶和离子液体改性膨润土共同作用,提高了羧基丁苯胶乳的稳定性。
具体实施方式
以下通过具体较佳实施例对本发明作进一步详细说明,但本发明并不仅限于以下的实施例。
需要说明的是,无特殊说明外,本发明中涉及到的化学试剂均通过商业渠道购买。
本发明中所使用的膨润土为钙基膨润土,粒径在200nm;
魔芋胶购自江苏采薇生物科技有限公司。
实施例1
一种纸板用羧基丁苯胶乳的制备方法,包括如下步骤:
S1、将10g膨润土加入到150mL乙醇溶剂中,超声分散均匀,向其中加入2g 1-乙烯基-3-丁基咪唑六氟磷酸盐,搅拌分散3h,然后静置12h,经抽滤、干燥、研磨,得到离子液体改性膨润土;
S2、将5g离子液体改性膨润土、1g魔芋胶、2g十二烷基硫酸钠和1g叔十二碳硫醇加入到100g去离子水中,搅拌均匀,通入氮气排出空气,然后向其中加入15g丁二烯、20g苯乙烯、5g丙烯酸,搅拌升温至60℃,加入引发剂过硫酸钾,反应2h,待反应结束后,得到分散液;
S3、将分散液降至室温,进行物理脱气,即得到羧基丁苯胶乳。
实施例2
一种纸板用羧基丁苯胶乳的制备方法,包括如下步骤:
S1、将20g膨润土加入到250mL乙醇溶剂中,超声分散均匀,向其中加入3g 1-烯丙基-3-乙基咪唑六氟磷酸盐,搅拌分散5h,然后静置12h,经抽滤、干燥、研磨,得到离子液体改性膨润土;
S2、将10g离子液体改性膨润土、2g魔芋胶、1g十二烷基硫酸钠和1g叔十二碳硫醇加入到150g去离子水中,搅拌均匀,通入氮气排出空气,然后向其中加入20g丁二烯、25g苯乙烯、10g丙烯酸,搅拌升温至70℃,加入引发剂过硫酸钾,反应2h,待反应结束后,得到分散液;
S3、将分散液降至室温,进行物理脱气,即得到羧基丁苯胶乳。
实施例3
一种纸板用羧基丁苯胶乳的制备方法,包括如下步骤:
S1、将20g膨润土加入到250mL乙醇溶剂中,超声分散均匀,向其中加入4g 1-烯丙基-3-乙基咪唑六氟磷酸盐,搅拌分散4h,然后静置12h,经抽滤、干燥、研磨,得到离子液体改性膨润土;
S2、将8g离子液体改性膨润土、2g魔芋胶、1g十二烷基硫酸钠和2g叔十二碳硫醇加入到150g去离子水中,搅拌均匀,通入氮气排出空气,然后向其中加入16g丁二烯、20g苯乙烯、10g甲基丙烯酸,搅拌升温至70℃,加入引发剂过硫酸钾,反应2h,待反应结束后,得到分散液;
S3、将分散液降至室温,进行物理脱气,即得到羧基丁苯胶乳。
实施例4
一种纸板用羧基丁苯胶乳的制备方法,包括如下步骤:
S1、将15g膨润土加入到250mL乙醇溶剂中,超声分散均匀,向其中加入3g 1-乙烯基-3-丁基咪唑六氟磷酸盐,搅拌分散4h,然后静置12h,经抽滤、干燥、研磨,得到离子液体改性膨润土;
S2、将6g离子液体改性膨润土、1.5g魔芋胶、2g十二烷基硫酸钠和1g叔十二碳硫醇加入到150g去离子水中,搅拌均匀,通入氮气排出空气,然后向其中加入20g丁二烯、24g苯乙烯、8g甲基丙烯酸,搅拌升温至60℃,加入引发剂过硫酸钾,反应3h,待反应结束后,得到分散液;
S3、将分散液降至室温,进行物理脱气,即得到羧基丁苯胶乳。
对比例1
一种纸板用羧基丁苯胶乳的制备方法,包括如下步骤:
S1、将5g膨润土、2g十二烷基硫酸钠和1g叔十二碳硫醇加入到100g去离子水中,搅拌均匀,通入氮气排出空气,然后向其中加入15g丁二烯、20g苯乙烯、5g丙烯酸,搅拌升温至60℃,加入引发剂过硫酸钾,反应2h,待反应结束后,得到分散液;
S2、将分散液降至室温,进行物理脱气,即得到羧基丁苯胶乳。
对比例2
一种纸板用羧基丁苯胶乳的制备方法,包括如下步骤:
S1、将5g膨润土、1g魔芋胶、2g十二烷基硫酸钠和1g叔十二碳硫醇加入到100g去离子水中,搅拌均匀,通入氮气排出空气,然后向其中加入15g丁二烯、20g苯乙烯、5g丙烯酸,搅拌升温至60℃,加入引发剂过硫酸钾,反应2h,待反应结束后,得到分散液;
S2、将分散液降至室温,进行物理脱气,即得到羧基丁苯胶乳。
对比例3
一种纸板用羧基丁苯胶乳的制备方法,包括如下步骤:
S1、将10g膨润土加入到150mL乙醇溶剂中,超声分散均匀,向其中加入2g 1-乙烯基-3-丁基咪唑六氟磷酸盐,搅拌分散3h,然后静置12h,经抽滤、干燥、研磨,得到离子液体改性膨润土;
S2、将5g离子液体改性膨润土、2g十二烷基硫酸钠和1g叔十二碳硫醇加入到100g去离子水中,搅拌均匀,通入氮气排出空气,然后向其中加入15g丁二烯、20g苯乙烯、5g丙烯酸,搅拌升温至60℃,加入引发剂过硫酸钾,反应2h,待反应结束后,得到分散液;
S3、将分散液降至室温,进行物理脱气,即得到羧基丁苯胶乳。
将实施例1-4和对比例1-3所制备的羧基丁苯胶乳进行性能测试,具体如下:
机械稳定性:依据SH/T 1151.1-2019标准进行;
化学稳定性:依据SH/T 1608-2014标准进行;
抗张强度测试:将胶乳涂布在纸张表面,涂胶量为10g/m2,干燥后进行抗张强度的测试,检测方法根据GB/T 12914-2018标准进行;测试结果如表1所示:
表1
最后需要说明的是:以上实施例不以任何形式限制本发明。对本领域技术人员来说,在本发明基础上,可以对其作一些修改和改进。因此,凡在不偏离本发明精神的基础上所做的任何修改或改进,均属于本发明要求保护的范围之内。
Claims (9)
1.一种纸板用羧基丁苯胶乳的制备方法,其特征在于,包括如下步骤:
S1、将膨润土加入到乙醇溶剂中,超声分散均匀,向其中加入含双键的离子液体,搅拌分散3-5h,然后静置、抽滤、干燥、研磨,得到离子液体改性膨润土;
S2、将离子液体改性膨润土、魔芋胶、十二烷基硫酸钠和叔十二碳硫醇加入到去离子水中,搅拌均匀,通入氮气排出空气,然后向其中加入丁二烯、苯乙烯、不饱和羧酸,搅拌升温至60-70℃,加入引发剂,进行反应,待反应结束后,得到分散液;
S3、将分散液降至室温,进行物理脱气,即得到羧基丁苯胶乳。
2.根据权利要求1所述的纸板用羧基丁苯胶乳的制备方法,其特征在于,步骤S1中,膨润土和含双键的离子液体的质量比为10-20:2-4。
3.根据权利要求1所述的纸板用羧基丁苯胶乳的制备方法,其特征在于,步骤S1中,所述含双键的离子液体选自1-乙烯基-3-丁基咪唑六氟磷酸盐、1-乙烯基-3-乙基咪唑四氟硼酸盐或1-烯丙基-3-乙基咪唑六氟磷酸盐。
4.根据权利要求1所述的纸板用羧基丁苯胶乳的制备方法,其特征在于,步骤S2中,离子液体改性膨润土、魔芋胶、十二烷基硫酸钠、叔十二碳硫醇、去离子水、丁二烯、苯乙烯、不饱和羧酸和引发剂的质量比为5-10:1-2:1-3:1-2:100-150:15-20:20-25:5-10:0.5-1。
5.根据权利要求1所述的纸板用羧基丁苯胶乳的制备方法,其特征在于,步骤S2中,所述不饱和羧酸选自丙烯酸或甲基丙烯酸。
6.根据权利要求1所述的纸板用羧基丁苯胶乳的制备方法,其特征在于,步骤S2中,所述引发剂为过硫酸钠、过硫酸钾或过硫酸铵。
7.根据权利要求1所述的纸板用羧基丁苯胶乳的制备方法,其特征在于,步骤S2中,反应时间为2-3h。
8.如权利要求1-7任一项所述制备方法所制备得到的羧基丁苯胶乳。
9.如权利要求8所述的羧基丁苯胶乳用于胶乳粘合剂。
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