CN114106290A - 一种单组分热固化聚脲及其制备方法 - Google Patents
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Abstract
本发明公开了一种单组分热固化聚脲及其制备方法,其中该单组分聚脲的制备方法为:(1)按比例将溶解了聚醚胺的有机溶剂滴加至异氰酸酯中,在(30‑60)min内滴加完毕;待异氰酸酯全部加入完毕,升高温度至(50‑75)℃,抽真空继续反应(1‑2)h,制得聚脲预聚体;(2)按计量比在聚脲预聚体中加入封端剂,在(15‑60)℃下反应(5‑8)h,制成预固剂;(3)将预固剂与氨基化合物按计量比在常温密闭条件下混合均匀,即制得单组分热固化聚脲。本发明制备的聚脲产品含脲基较多,且封端剂用量较少,储存期长。
Description
技术领域
本发明属于聚脲的制备技术领域,具体涉及一种单组分热固化聚脲及其制备方法。
背景技术
聚脲通过氨基化合物与异氰酸酯基反应制备得到,但由于氨基的活性很大,氨基化合物与异氰酸酯基之间的反应非常快,操作周期短,往往难以控制,一般情况下,通过改善氨基的活性来改善其反应性能,市场上常见较长的反应性能大多在30min左右,仍不能改善聚脲的施工周期。
发明内容
本发明所要解决的技术问题是:克服现有技术中存在的不足,提供一种单组分热固化聚脲及其制备方法。
本发明为解决技术问题所采取的技术方案如下:
一种单组分热固化聚脲的制备方法,所述制备方法为:
(1)、按比例将溶解了聚醚胺的有机溶剂滴加至异氰酸酯中,在30-60 min内滴加完毕;然后升高温度至50-75 ℃,抽真空继续反应1-2 h,制得聚脲预聚体;
(2)、按计量比在聚脲预聚体中加入封端剂,在15-60 ℃下,反应5-8 h,制成预固剂;
(3)、将预固剂与氨基化合物按计量比在常温密闭条件下混合均匀,即制得单组分热固化聚脲。
较好地,所述聚醚胺与异氰酸酯的摩尔比为(0.3-0.7):1。
较好地,所述封端剂与异氰酸酯用量的摩尔比为(0.6-1.5):1。
较好地,所述氨基化合物中所含氨基的摩尔量应与封端剂的摩尔量比为1:(1-1.1)。
较好地,所述聚醚胺为聚醚胺D230、聚醚胺D400、聚醚胺D2000中的一种或多种。
较好地,所述有机溶剂为乙酸丁酯、乙酸乙酯、丁酮、甲苯或碳酸二甲酯;所述聚醚胺与有机溶剂的重量比为100:(50-100)。
较好地,所述封端剂为甲乙酮肟或30%亚硫酸氢钠溶液;所述氨基化合物为二乙烯三胺、己二胺、三乙烯四胺、乙二胺中的一种或多种;所述异氰酸酯为1,6-已二异氰酸酯(HDI)、异氟尔酮二异氰酸酯(IPDI)、甲苯-2、4-二异氰酸酯(TDI)、苯二亚甲基二异氰酸酯(XDI)中的一种或多种。
由上述单组分热固化聚脲的制备方法制得的单组分热固化聚脲。
上述单组分热固化聚脲的使用方法,具体为:使用时将单组分热固化聚脲均匀涂敷在基材表面,在50-135℃条件下放置30-60 min,即可使其发生固化反应。
所述基材为环氧支架、金属或木材。
本发明的积极有益效果如下:
在本发明中首先使用聚醚胺与异氰酸酯反应制备聚脲预聚体,提前反应消耗掉部分异氰酸酯基,减少后续封端剂的用量,同时聚醚胺与异氰酸酯基反应制备出含脲基的大分子,然后再使用封端剂对聚脲预聚体封端,用于隔绝氨基化合物与聚脲预聚体中的异氰酸酯基的反应,从而降低二者的反应活性,聚脲的制备反应性能得到改善。
本发明制备的聚脲产品含脲基较多,且封端剂用量较少,储存期长。
具体实施方式
下面结合具体实施例对本发明的技术方案做进一步详细、清楚地描述,但本发明的保护范围并不局限于此。
实施例1:
一种单组分热固化聚脲的制备方法,所述制备方法为:
(1)、首先将聚醚胺D230溶解在乙酸丁酯中,其中聚醚胺D230与乙酸丁酯的重量比为100:50,然后在惰性氛围,低于20℃条件下,将溶解了聚醚胺的有机溶剂滴加至HDI中,在30 min内滴加完毕;然后升高温度至50 ℃,抽真空继续反应2 h,制得聚脲预聚体;所述聚醚胺D230与HDI的摩尔比为0.3:1;
(2)、按计量比在聚脲预聚体中加入甲乙酮肟,在55 ℃下反应8 h制得预固剂;其中甲乙酮肟与HDI的摩尔比为1.47:1;
(3)、将预固剂与二乙烯三胺按计量比在常温密闭条件下混合均匀,即制得单组分热固化聚脲;其中二乙烯三胺所含氨基的摩尔量与甲乙酮肟摩尔用量比为1:1。
上述单组分热固化聚脲的使用方法,具体为:使用时将单组分热固化聚脲均匀涂敷在环氧支架表面,在135℃条件下放置50min,使其发生固化反应。
实施例2:
一种单组分热固化聚脲的制备方法,所述制备方法为:
(1)、首先将聚醚胺D400溶解在丁酮中,其中聚醚胺D400与丁酮的重量比为100:80,然后在惰性氛围,低于20℃条件下,将溶解了聚醚胺的有机溶剂滴加至IPDI中,在50min内滴加完毕;然后升高温度至60 ℃,抽真空继续反应1.5 h,制得聚脲预聚体;所述聚醚胺D400与IPDI的摩尔比为0.5:1;
(2)、按计量比在聚脲预聚体中加入甲乙酮肟,在60 ℃下反应7 h制得预固剂;其中甲乙酮肟与IPDI的摩尔比为1.05:1;
(3)、将预固剂与己二胺按计量比在常温密闭条件下混合均匀,即制得单组分热固化聚脲,其中己二胺所含氨基的摩尔量与甲乙酮肟摩尔用量的比为1:1.05。
上述单组分热固化聚脲的使用方法,具体为:使用时将单组分热固化聚脲均匀涂敷在环氧支架表面,在125℃条件下放置60min,使其发生固化反应。
实施例3:
一种单组分热固化聚脲的制备方法,所述制备方法为:
(1)、首先将聚醚胺D2000溶解在甲苯中,其中聚醚胺D2000与甲苯的重量比为100:100,然后在惰性氛围,低于20℃条件下,将溶解了聚醚胺的有机溶剂滴加至TDI中,在60min内滴加完毕;然后升高温度至75 ℃,抽真空继续反应1 h,制得聚脲预聚体;所述聚醚胺D2000与TDI的摩尔比为0.7:1;
(2)、按计量比在聚脲预聚体中加入30%亚硫酸氢钠溶液,在20 ℃下反应5 h制得预固剂,其中亚硫酸氢钠与TDI的摩尔比为0.63:1;
(3)、将预固剂与三乙烯四胺按计量比在常温密闭条件下混合均匀,即制得单组分热固化聚脲,其中三乙烯四胺所含氨基的摩尔量与亚硫酸氢钠摩尔用量的比为1:1.1。
上述单组分热固化聚脲的使用方法,具体为:使用时将单组分热固化聚脲均匀涂敷在环氧支架表面,在55℃条件下放置60min,使其发生固化反应。
上述实施例1-3制备的单组分热固化聚脲的储存期均大于6个月。
Claims (10)
1.一种单组分热固化聚脲的制备方法,其特征在于,所述制备方法为:
(1)、按比例将溶解了聚醚胺的有机溶剂滴加至异氰酸酯中,在30-60 min内滴加完毕;然后升高温度至50-75 ℃,抽真空继续反应1-2 h,制得聚脲预聚体;
(2)、按计量比在聚脲预聚体中加入封端剂,在15-60 ℃下,反应5-8 h,制成预固剂;
(3)、将预固剂与氨基化合物按计量比在常温密闭条件下混合均匀,即制得单组分热固化聚脲。
2.根据权利要求1所述的单组分热固化聚脲的制备方法,其特征在于,所述聚醚胺与异氰酸酯的摩尔比为(0.3-0.7):1。
3.根据权利要求1所述的单组分热固化聚脲的制备方法,其特征在于,所述封端剂与异氰酸酯用量的摩尔比为(0.6-1.5):1。
4.根据权利要求1所述的单组分热固化聚脲的制备方法,其特征在于,所述氨基化合物中所含氨基的摩尔量应与封端剂的摩尔量比为1:(1-1.1)。
5.根据权利要求1所述的单组分热固化聚脲的制备方法,其特征在于,聚醚胺为聚醚胺D230、聚醚胺D400、聚醚胺D2000中的一种或多种。
6.根据权利要求1所述的单组分热固化聚脲的制备方法,其特征在于,有机溶剂为乙酸丁酯、乙酸乙酯、丁酮、甲苯或碳酸二甲酯;所述聚醚胺与有机溶剂的重量比为100:(50-100)。
7.根据权利要求1所述的单组分热固化聚脲的制备方法,其特征在于,封端剂为甲乙酮肟或30%亚硫酸氢钠溶液;氨基化合物为二乙烯三胺、己二胺、三乙烯四胺、乙二胺中的一种或多种;异氰酸酯为1,6-已二异氰酸酯(HDI)、异氟尔酮二异氰酸酯(IPDI)、甲苯-2、4-二异氰酸酯(TDI)、苯二亚甲基二异氰酸酯(XDI)中的一种或多种。
8.由权利要求1所述的单组分热固化聚脲的制备方法制得的单组分热固化聚脲。
9.一种权利要求8所述的单组分热固化聚脲的使用方法,其特征在于,使用方法为:使用时将单组分热固化聚脲均匀涂敷在基材表面,在50-135 ℃条件下放置30-60 min,即可使其发生固化反应。
10.根据权利要求9所述的单组分热固化聚脲的使用方法,其特征在于,所述基材为环氧支架、金属或木材。
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CN109486382A (zh) * | 2018-10-12 | 2019-03-19 | 华南理工大学 | 一种木质素基聚脲涂料及制备方法 |
CN113336953A (zh) * | 2021-06-21 | 2021-09-03 | 宁波润禾高新材料科技股份有限公司 | 一种改性聚醚胺、其制备方法及其应用 |
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CN102101967A (zh) * | 2010-12-17 | 2011-06-22 | 深圳职业技术学院 | 单组分聚脲型聚氨酯涂料及其制备方法 |
CN103773208A (zh) * | 2014-01-21 | 2014-05-07 | 天津开发区科泰化工新材料开发有限公司 | 单组份刮涂型聚脲涂料及其制备方法 |
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