CN105348449A - 一种氟硅改性聚氨酯丙烯酸酯复合乳液的制备方法 - Google Patents

一种氟硅改性聚氨酯丙烯酸酯复合乳液的制备方法 Download PDF

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CN105348449A
CN105348449A CN201510940649.6A CN201510940649A CN105348449A CN 105348449 A CN105348449 A CN 105348449A CN 201510940649 A CN201510940649 A CN 201510940649A CN 105348449 A CN105348449 A CN 105348449A
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姚伯龙
姜峻
李洪萍
王利魁
邓丽朵
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Abstract

本发明的目的在于提供一种利用有机氟和有机硅进行改性制备耐水、耐候、耐溶剂性、高强度聚氨酯-丙烯酸酯复合乳液及其制备方法。本发明的聚氨酯-丙烯酸酯复合乳液经有机氟和有机硅进行改性后,当乳液固化时,有机氟和有机硅链段倾向于固化膜表面聚集取向,而聚氨酯链段及丙烯酸酯链段朝向内层。这样既能在保证该乳液具有聚氨酯树脂优良的附着力、弹性和韧性又赋予改性聚氨酯-丙烯酸酯涂膜优良的耐水性、耐溶剂性、耐候性和较强的机械性能。

Description

一种氟硅改性聚氨酯丙烯酸酯复合乳液的制备方法
技术领域
本发明属于高分子材料技术领域,具体涉及一种氟硅改性聚氨酯丙烯酸酯复合乳液的制备方法。
背景介绍
近年来,随着人们环保意识的增强,世界各国都相继制定出限制挥发性有机物(VOC)排放的法律和最低排放标准,从而迫使传统的有机溶剂型涂料向环保型水性涂料、粉末涂料及UV固化涂料等方面转变。其中,水性聚氨酯乳液以其环保、节能、综合性能好、使用安全方便,清洁生产理念而日益被人们所关注,同时其固化膜具有良好附着力、弹性及韧性而在涂层、胶黏剂、油墨等领域得到了广泛的应用。然而,水性聚氨酯成膜后存在着耐水性、耐溶剂性差、机械性能不佳等缺点,通常可以采用交联改性和共聚改性来改善胶膜的耐水性和机械性能。共聚改性能综合多种树脂的优异性能,其中丙烯酸酯共聚改性水性聚氨酯,可以得到核壳结构的聚合物,充分利用了聚氨酯和丙烯酸酯的优势,得到性能优异的聚合物,而成为今年来研究的热点。
甲基丙烯酸十二氟庚酯(DFHMA)中氟元素含量为57wt%、含有3个-CF3基团,并均处于链段外层(已知-CF3基团聚合物表面能比聚四氟乙烯低),因此其疏水、疏油性更好,且有优良的耐沾污性。
本研究从氟硅元素的低表面能出发,采用原位聚合法制备氟硅改性聚氨酯-丙烯酸酯复合乳液。乳液在成膜过程中,氟硅元素能自发的向涂膜的表面迁移、富集,赋予胶膜良好的疏水特性。考虑单一丙烯酸酯单体与含氟丙烯酸酯单体共聚制备的涂层附着力不高、硬度等综合性能不佳,引入促进附着力的功能性丙烯酸单体,制备室温固化氟硅改性聚氨酯-丙烯酸酯树脂。
发明内容
本发明的目的在于提供一种利用有机氟和有机硅进行改性制备耐水、耐候、耐溶剂性、高强度聚氨酯-丙烯酸酯复合乳液及其制备方法。本发明的聚氨酯-丙烯酸酯复合乳液经有机氟和有机硅进行改性后,当乳液固化时,有机氟和有机硅链段倾向于固化膜表面聚集取向,而聚氨酯链段及丙烯酸酯链段朝向内层。这样既能在保证该乳液具有聚氨酯树脂优良的附着力、弹性和韧性又赋予改性聚氨酯-丙烯酸酯涂膜优良的耐水性、耐溶剂性、耐候性和较强的机械性能。
本发明的技术方案是:
一种氟硅改性聚氨酯丙烯酸酯复合乳液的制备,包括如下步骤:
(1)聚氨酯预聚物的制备:将计量的异佛尔酮二异氰酸酯、聚碳酸酯二元醇、端羟基硅油、甲基丙烯酸甲酯、丙烯酸正丁酯、含氟丙烯酸单体和催化剂加入装有温度计、回流冷凝管、搅拌器的500mL四口烧瓶中,升温至80℃反应2h;保持温度恒定,分两次加入计量的扩链剂,添加时间间隔为0.5h,继续保温反应4h,反应过程中加入少量丙酮用于调节体系黏度;最后将反应温度降至70℃,加入甲基丙烯酸羟乙酯,保温反应3h,反应过程中取样做红外谱图,直至红外图谱中-NCO特征吸收峰(2267cm-1处)消失,反应停止,即得丙烯酸酯封端的聚氨酯预聚物。整个过程通过甲苯-二正丁胺返滴定法测定体系中NCO含量,当与理论NCO接近时进行下一步反应。
(2)三乙胺中和及自由基聚合:将聚氨酯预聚物反应体系温度降至35℃、通过滴液漏斗逐滴向四口烧瓶中滴加计量的三乙胺进行中和反应,滴加结束后继续反应0.5h;然后滴加去离子水乳化,同时将搅拌速度调至2000转/分;乳化完成后加入功能性丙烯酸单体,溶胀一段时间后,将温度升至80℃,缓慢滴加计量的催化剂KPS,滴加完毕继续保温反应2h,降温、出料,既得氟硅改性聚氨酯-丙烯酸酯复合乳液(WPUA)。
步骤(1)中所述端羟基硅油为道康宁SF-8427、OFX-3667、BY16-004中的至少一种;
步骤(1)中所述扩链剂为二羟甲基丙酸(DMPA)、二羟甲基丁酸(DMBA)中的至少一种;
步骤(1)中所述含氟丙烯酸单体为甲基丙烯酸十二氟庚酯、甲基丙烯酸六氟丁酯中的至少一种;
步骤(1)中所述催化剂为二月桂酸二丁基锡、辛酸亚锡中的至少一种;
步骤(2)中所述功能性丙烯酸单体为丙烯酸羟乙酯(HEA)、甲基丙烯酸羟乙酯(HEMA)、丙烯酸羟丙酯(HPA)、甲基丙烯酸羟丙酯(HPMA)、甲基丙烯酸缩水甘油酯(GMA)中的至少一种;
本发明的有益效果是:通过以上反应,合成得到耐水、耐候、耐污性和较强的机械性能的聚氨酯-丙烯酸酯复合乳液。该乳液可用于提高涂料的耐水性、耐候性、防污性、耐热性,可广泛用于塑料、地板、门窗等具有耐水、耐候、防污要求的表面。
具体实施方式
下列实施实例用以更详细地描述本发明方案,但本发明并不局限于实例所描述的方案。
实施例1
聚氨酯预聚物的制备:将16.60g异佛尔酮二异氰酸酯、22.37g聚碳酸酯二元醇、10.84g端羟基硅油(SF-8427)、18.0g甲基丙烯酸甲酯、7.2g丙烯酸正丁酯、7.2g甲基丙烯酸十二氟庚酯和0.05g二月桂酸二丁基锡加入装有温度计、回流冷凝管、搅拌器的500mL四口烧瓶中,于油浴锅中,升温至80℃反应2h;保持温度恒定,分两次加入5.83g的二羟甲基丁酸,添加时间间隔为0.5h,继续保温反应4h,反应过程中加入少量丙酮用于调节体系黏度;最后将反应温度降至70℃,加入1.26g甲基丙烯酸羟乙酯,保温反应3h,反应过程中取样做红外谱图,直至红外图谱中-NCO特征吸收峰(2267cm-1处)消失,反应停止,即得丙烯酸酯封端的聚氨酯预聚物。整个过程通过甲苯-二正丁胺返滴定法测定体系中NCO含量,当与理论NCO接近时进行下一步反应。
(2)三乙胺中和及自由基聚合:将聚氨酯预聚物反应体系温度降至35℃、通过滴液漏斗逐滴向四口烧瓶中滴加入4.5g的三乙胺进行中和反应,滴加结束后继续反应0.5h;然后滴加200g去离子水乳化,同时将搅拌速度调至2000转/分;乳化完成后加入2.8g甲基丙烯酸羟乙酯,溶胀一段时间后,将温度升至80℃,缓慢滴加0.2g的催化剂KPS,滴加完毕继续保温反应2h,降温、出料,既得氟硅改性聚氨酯-丙烯酸酯复合乳液(WPUA)。

Claims (1)

1.一种氟硅改性聚氨酯丙烯酸酯复合乳液的制备方法,其特征步骤为:
(1)聚氨酯预聚物的制备:将计量的异佛尔酮二异氰酸酯、聚碳酸酯二元醇、端羟基硅油、甲基丙烯酸甲酯、丙烯酸正丁酯、含氟丙烯酸单体和催化剂加入装有温度计、回流冷凝管、搅拌器的500mL四口烧瓶中,升温至80℃反应2h;保持温度恒定,分两次加入计量的扩链剂,添加时间间隔为0.5h,继续保温反应4h,反应过程中加入少量丙酮用于调节体系黏度;最后将反应温度降至70℃,加入甲基丙烯酸羟乙酯,保温反应3h,反应过程中取样做红外谱图,直至红外图谱中-NCO特征吸收峰(2267cm-1处)消失,反应停止,即得丙烯酸酯封端的聚氨酯预聚物。整个过程通过甲苯-二正丁胺返滴定法测定体系中NCO含量,当与理论NCO接近时进行下一步反应。
(2)三乙胺中和及自由基聚合:将聚氨酯预聚物反应体系温度降至35℃、通过滴液漏斗逐滴向四口烧瓶中滴加计量的三乙胺进行中和反应,滴加结束后继续反应0.5h;然后滴加去离子水乳化,同时将搅拌速度调至2000转/分;乳化完成后加入功能性丙烯酸单体,溶胀一段时间后,将温度升至80℃,缓慢滴加计量的催化剂KPS,滴加完毕继续保温反应2h,降温、出料,既得氟硅改性聚氨酯-丙烯酸酯复合乳液(WPUA)。
步骤(1)中所述端羟基硅油为道康宁SF-8427、OFX-3667、BY16-004中的至少一种;
步骤(1)中所述扩链剂为二羟甲基丙酸(DMPA)、二羟甲基丁酸(DMBA)中的至少一种;
步骤(1)中所述含氟丙烯酸单体为甲基丙烯酸十二氟庚酯、甲基丙烯酸六氟丁酯中的至少一种;
步骤(1)中所述催化剂为二月桂酸二丁基锡、辛酸亚锡中的至少一种;
步骤(2)中所述功能性丙烯酸单体为丙烯酸羟乙酯(HEA)、甲基丙烯酸羟乙酯(HEMA)、丙烯酸羟丙酯(HPA)、甲基丙烯酸羟丙酯(HPMA)、甲基丙烯酸缩水甘油酯(GMA)中的至少一种。
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CN106977686A (zh) * 2017-03-24 2017-07-25 中山市聚力有机硅技术有限公司 一种含聚氟硅氧烷嵌段的聚氨酯丙烯酸酯共聚物及其制备方法
CN108467463A (zh) * 2018-04-03 2018-08-31 长春工业大学 一种防水型涂料用水性聚氨酯-聚丙烯酸酯复合乳液及其制备方法
CN108587437A (zh) * 2018-05-11 2018-09-28 嘉兴烯成新材料有限公司 一种石墨烯和有机氟硅水性聚氨酯复合乳液及其制备方法
CN108864929A (zh) * 2018-07-27 2018-11-23 武汉理工大学 一种水性低表面能树脂/纳米氧化锌复合防污涂料及其制备方法
CN110343463A (zh) * 2019-06-14 2019-10-18 宁波富纳新材料科技有限公司 一种热弯增硬防污纳米涂层及其制备方法和涂覆固化方法
CN112375419A (zh) * 2020-11-12 2021-02-19 漳州三德利油漆涂料有限公司 一种金属表面热反射隔热型水性聚氨酯面漆及其制备方法
CN113999586A (zh) * 2021-11-24 2022-02-01 海洋化工研究院有限公司 一种耐候性水基聚氨酯哑光清漆
CN115433481A (zh) * 2022-10-10 2022-12-06 瑞通高分子科技(浙江)有限公司 一种172nm准分子UV肤感耐污地板涂料的组成及其制备方法
CN116041713A (zh) * 2022-12-21 2023-05-02 江西省科学院应用化学研究所 一种三嵌段氟硅协同改性水性聚氨酯-丙烯酸酯乳液及其制备方法

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CN106977686A (zh) * 2017-03-24 2017-07-25 中山市聚力有机硅技术有限公司 一种含聚氟硅氧烷嵌段的聚氨酯丙烯酸酯共聚物及其制备方法
CN106977686B (zh) * 2017-03-24 2019-10-01 中山市聚力有机硅技术有限公司 一种含聚氟硅氧烷嵌段的聚氨酯丙烯酸酯共聚物及其制备方法
CN108467463A (zh) * 2018-04-03 2018-08-31 长春工业大学 一种防水型涂料用水性聚氨酯-聚丙烯酸酯复合乳液及其制备方法
CN108587437A (zh) * 2018-05-11 2018-09-28 嘉兴烯成新材料有限公司 一种石墨烯和有机氟硅水性聚氨酯复合乳液及其制备方法
CN108587437B (zh) * 2018-05-11 2021-01-26 嘉兴烯成新材料有限公司 一种石墨烯和有机氟硅水性聚氨酯复合乳液及其制备方法
CN108864929A (zh) * 2018-07-27 2018-11-23 武汉理工大学 一种水性低表面能树脂/纳米氧化锌复合防污涂料及其制备方法
CN108864929B (zh) * 2018-07-27 2019-11-08 武汉理工大学 一种水性低表面能树脂/纳米氧化锌复合防污涂料及其制备方法
CN110343463A (zh) * 2019-06-14 2019-10-18 宁波富纳新材料科技有限公司 一种热弯增硬防污纳米涂层及其制备方法和涂覆固化方法
CN112375419A (zh) * 2020-11-12 2021-02-19 漳州三德利油漆涂料有限公司 一种金属表面热反射隔热型水性聚氨酯面漆及其制备方法
CN113999586A (zh) * 2021-11-24 2022-02-01 海洋化工研究院有限公司 一种耐候性水基聚氨酯哑光清漆
CN115433481A (zh) * 2022-10-10 2022-12-06 瑞通高分子科技(浙江)有限公司 一种172nm准分子UV肤感耐污地板涂料的组成及其制备方法
CN116041713A (zh) * 2022-12-21 2023-05-02 江西省科学院应用化学研究所 一种三嵌段氟硅协同改性水性聚氨酯-丙烯酸酯乳液及其制备方法

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