CN106046319A - 一种纳米Al2O3改性环氧微胶囊的制备方法 - Google Patents
一种纳米Al2O3改性环氧微胶囊的制备方法 Download PDFInfo
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Abstract
一种纳米Al2O3改性环氧微胶囊的制备方法,称取0.5gSDBS和0.5gPVA溶于100mL蒸馏水中配成乳化剂;取8mL甲醛、3.2g三聚氰胺、0.8g尿素和20mL蒸馏水混合,用三乙醇胺溶液调节pH值至8‑9,于60‑65℃反应0.5h得MUF预聚体,再加入3.5%(wt,质量分数)的纳米Al2O3,超声分散10min,得改性MUF预聚体;将10gDGCHD、预先配制的乳化剂及改性MUF预聚体混合,在5500‑5800r/min转速下乳化20‑25min,然后倒入三口烧瓶中,用10%柠檬酸调节pH值为3~4,在55℃、450r/min转速下保温反应1.5h得到微胶囊悬浮液,冷却至室温,减压抽滤,用去离子水和无水乙醇洗涤,于75℃下干燥20h,即得。本发明的有益效果是:合成工艺简单,反应条件温和,生产成本较低,可重复性好。
Description
技术领域
本发明涉及材料合成方法,具体的是一种纳米Al2O3改性环氧微胶囊的制备方法。
背景技术
环氧树脂是一类在液态下使用,与固化剂反应后可形成三维网状的热固性塑料,具有固化时体积收缩率小、粘结性优异、耐热性好、耐化学品以及力学和电气性能好等优点。使用前,环氧树脂与固化剂分开储存,使用时再按一定比例混 合均匀,导致其储存期较短,应用范围受限。将其微胶囊化制成的单组分环氧树脂体系可大大提高储存期,方便运输,适合产业化,广泛应用于涂料、胶粘剂和复合材料等领域。但是常用的环氧树脂黏度较大,微胶囊化时需要另加稀释剂。 三聚氰胺-尿素-甲醛树脂作为一种常用的材料,虽然韧性较好,但是热稳定性差。而纳米氧化铝(纳米Al2O3)对增强聚合物表面性能、力学性能和稳定性等方面均有良好效果。
发明内容
本发明所要解决的技术问题在于提供一种纳米Al2O3改性环氧微胶囊的制备方法,提供一种新的合成方法。
本发明采用的合成方法,包括如下步骤:
a、称取0.5gSDBS和0.5gPVA溶于100mL蒸馏水中配成乳化剂,备用;
b、取8mL甲醛、3.2g三聚氰胺、0.8g尿素和20mL蒸馏水混合,用三
乙醇胺溶液调节pH值至8~9,于60-65℃反应0.5h得三聚氰胺-尿素-甲醛 (MUF)预聚体,称取3.5%(wt,质量分数)的纳米Al2O3加入到 MUF预聚体中,并超声分散10min,得到改性的MUF预聚体;
c、将10gDGCHD、预先配制的乳化剂及改性MUF预聚体混合,在5500-5800r/min转速下乳化20-25min,然后倒入三口烧瓶中,用10%柠檬酸调节pH值为3~4,在55℃、450r/min转速下保温反应1.5h得到微胶囊悬浮液,冷却至室温,减压抽滤,用去离子水和无水乙醇洗涤,于75℃下干燥20h,即得。
本发明的有益效果是:合成工艺简单,反应条件温和,生产成本较低,可重复性好。
具体实施方式
以下结合实例进一步说明本发明的内容,由技术常识可知,本发明也可通过其它的不脱离本发明技术特征的方案来描述,因此所有在本发明范围内或等同本发明范围内的改变均被本发明包含。
实施例1:a、称取0.5gSDBS和0.5gPVA溶于100mL蒸馏水中配成乳化剂,备用;
c、取8mL甲醛、3.2g三聚氰胺、0.8g尿素和20mL蒸馏水混合,用三
乙醇胺溶液调节pH值至8,于60℃反应0.5h得三聚氰胺-尿素-甲醛 (MUF)预聚体,称取3.5%(wt,质量分数)的纳米Al2O3加入到 MUF预聚体中,并超声分散10min,得到改性的MUF预聚体;
c、将10gDGCHD、预先配制的乳化剂及改性MUF预聚体混合,在5500r/min转速下乳化20min,然后倒入三口烧瓶中,用10%柠檬酸调节pH值为3,在55℃、450r/min转速下保温反应1.5h得到微胶囊悬浮液,冷却至室温,减压抽滤,用去离子水和无水乙醇洗涤,于75℃下干燥20h,即得。
实施例2:
a、称取0.5gSDBS和0.5gPVA溶于100mL蒸馏水中配成乳化剂,备用;
d、取8mL甲醛、3.2g三聚氰胺、0.8g尿素和20mL蒸馏水混合,用三
乙醇胺溶液调节pH值至9,于65℃反应0.5h得三聚氰胺-尿素-甲醛 (MUF)预聚体,称取4%(wt,质量分数)的纳米Al2O3加入到 MUF预聚体中,并超声分散10min,得到改性的MUF预聚体;
c、将10gDGCHD、预先配制的乳化剂及改性MUF预聚体混合,在5800r/min转速下乳化25min,然后倒入三口烧瓶中,用10%柠檬酸调节pH值为4,在55℃、450r/min转速下保温反应1.5h得到微胶囊悬浮液,冷却至室温,减压抽滤,用去离子水和无水乙醇洗涤,于75℃下干燥20h,即得。
通过纳米Al2O3添加量对微胶囊囊芯含量的实验,当纳米Al2O3的加入量为3.5~4%时,微胶囊的囊芯含量在95.2%~95.8%之间,当纳米Al2O3的添加量为0-3%时,囊芯含量在93.7%~94.5%之间;当纳米Al2O3的添加量增加到6%时,囊芯含量降至76%,这是由于加入的纳米Al2O3过多,其自身也可能团聚并被包覆形成微球。所以可以看出3.5-4%的纳米Al2O3是最优条件。
而随着纳米Al2O3的添加,微胶囊初始分解温度逐渐增大,最大热降解速率对应温度也向高温移动。未改性微胶囊的为187℃,当壁材中Al2O3的添加量为3%和4%时,微胶囊的Tinital分别提高到198℃和210℃。当Al2O3的添加量增加到6%时,改性微胶囊的Tinital达215℃。这说明通过在壁材中添加一定量的纳米Al2O3,有助于微胶囊热稳定性的提高。
Claims (1)
1.一种纳米Al2O3改性环氧微胶囊的制备方法,包括如下步骤:
a、称取0.5gSDBS和0.5gPVA溶于100mL蒸馏水中配成乳化剂,备用;
取8mL甲醛、3.2g三聚氰胺、0.8g尿素和20mL蒸馏水混合,用三
乙醇胺溶液调节pH值至8~9,于60-65℃反应0.5h得三聚氰胺-尿素-甲醛 (MUF)预聚体,称取3.5%(wt,质量分数)的纳米Al2O3加入到 MUF预聚体中,并超声分散10min,得到改性的MUF预聚体;
c、将10gDGCHD、预先配制的乳化剂及改性MUF预聚体混合,在5500-5800r/min转速下乳化20-25min,然后倒入三口烧瓶中,用10%柠檬酸调节pH值为3~4,在55℃、450r/min转速下保温反应1.5h得到微胶囊悬浮液,冷却至室温,减压抽滤,用去离子水和无水乙醇洗涤,于75℃下干燥20h,即得。
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CN109395677A (zh) * | 2018-11-16 | 2019-03-01 | 河北科技大学 | 一种原位聚合法制备阻燃剂微胶囊的方法 |
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CN103641366A (zh) * | 2013-11-25 | 2014-03-19 | 深圳大学 | 环氧微胶囊的制备方法 |
CN104945847A (zh) * | 2015-05-14 | 2015-09-30 | 广东药学院 | 一种环氧树脂纳米微胶囊及其制备方法 |
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CN103641366A (zh) * | 2013-11-25 | 2014-03-19 | 深圳大学 | 环氧微胶囊的制备方法 |
CN104945847A (zh) * | 2015-05-14 | 2015-09-30 | 广东药学院 | 一种环氧树脂纳米微胶囊及其制备方法 |
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CN109395677A (zh) * | 2018-11-16 | 2019-03-01 | 河北科技大学 | 一种原位聚合法制备阻燃剂微胶囊的方法 |
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