CN104017166B - 一种耐高温热塑性聚氨酯弹性体的制备方法 - Google Patents
一种耐高温热塑性聚氨酯弹性体的制备方法 Download PDFInfo
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Abstract
本发明公开了一种耐高温热塑性聚氨酯弹性体的制备方法,其步骤为:1)将抗氧剂、催化剂及熔融后的聚酯多元醇加入反应釜,加热、减压条件下脱水后形成A组份;2)将二异氰酸酯加热熔融后形成B组份;3)将熔融后的三元醇与熔融后的二元醇混合均匀,然后在减压、加热条件下脱水形成C组份;4)将挤出机的反应段比例调整增加至80~85%,将挤出机的混合段比例降低至15~20%;5)将A组份、B组份、C组份同时加入双螺杆挤出机中,经逐步聚合反应得到耐高温热塑性聚氨酯弹性体。采用本发明所述的制备方法制得的CHDI型耐高温热塑性聚氨酯弹性体具有更低的生产成本,更高的物理性能和耐高温特性。
Description
技术领域
本发明涉及一种热塑性聚氨酯弹性体的制备方法,尤其涉及一种CHDI型耐高温热塑性聚氨酯弹性体的制备方法。
背景技术
耐高温聚氨酯弹性体,主要用于电热毯绝缘层、弹性块及导油管等产品。目前市场上的电热毯加热丝TPU绝缘层、一些机车内部的弹性块或导油管,由于工作环境温度较高,如果使用普通的TPU,在温度达到80℃以上时物性严重下降,使得产品效用下降。针对这一不足,CHDI型耐高温聚氨酯弹性体,其使用的反式CHDI分子结构规整对称,能改善材料的微相分离程度,从根本上提高了TPU的耐热性能,提高材料本身的储能模量,降低材料的力学内耗,使得材料在高温环境中也能表现出优异的物理性能,而普通方法通过二步法合成的CHDI型TPU的分子量分布较宽,不利于加工,且生产效率低,无法大批量供应稳定的产品。
发明内容
本发明所要解决的技术问题,提供一种采用“一步法”合成具有更优异的物理性能和耐高温性能CHDI型耐高温热塑性聚氨酯弹性体的方法。
为解决上述技术问题,本发明所采用的技术方案为:一种耐高温热塑性聚氨酯弹性体的制备方法,其步骤为:
1)将抗氧剂、催化剂及在90~200℃熔融后的聚酯多元醇加入反应釜中;保持反应釜内温度为90~200℃,调整反应釜内压力至-0.08~-0.1MPa,脱水0.5~8h,然后调整反应釜内温度至75~115℃,通入氮气解除真空,形成A组份;
所述的抗氧剂占聚酯多元醇总质量的3~8‰,所述的催化剂占聚酯多元醇总质量的50~500ppm;
2)将二异氰酸酯加热至65~95℃,熔融后形成B组份;
3)将二元醇扩链剂加热至60~100℃熔融,将三元醇扩链剂加热至70~100℃熔融,将熔融后的三元醇与熔融后的二元醇按摩尔比1:2~1:6加入计量罐中混合均匀,调整计量罐内压力至-0.08~-0.1MPa,脱水4~6h,形成C组份;
所述的三元醇为三羟甲基丙烷(TMP);
4)将挤出机的反应段比例调整增加至80~85%,将挤出机的混合段比例降低至15~20%;
所述的挤出机混合段比例调整前占螺杆总长度的21%,挤出机的反应段螺纹比例调整前占螺杆总长度的79%;
5)将A组份、B组份、C组份按质量比55:10:35~68:7:25同时加入双螺杆挤出机中,经逐步聚合反应得到CHDI型耐高温热塑性聚氨酯弹性体。
所述的聚酯多元醇由二元羧酸与二元醇经缩聚反应制得,聚酯多元醇的数均分子量为1000~6000。
所述的二元羧酸为脂肪族二元羧酸或芳香族二元羧酸;所述的二元醇选自下述物质中的一种或几种:乙二醇、1,4-丁二醇、1,6-己二醇、2,2-二甲基-1,3-丙二醇。
所述的二异氰酸酯是由质量百分含量为70~100%的反式1,4-环己烷二异氰酸酯(CHDI)与质量百分含量为0~30%的顺式1,4-环己烷二异氰酸酯(CHDI)组成的混合物。
所述的二元醇扩链剂为C4~C8的直链二醇、含苯环的对称二端羟基物、含苯环的非对称的二端羟基物中的一种或几种的混合。
所述的抗氧剂选自抗氧剂1010、抗氧剂1076、抗氧剂1024、抗氧剂1098、抗氧剂245中的一种或两种及以上的混合物。
所述的催化剂选自辛酸亚锡、二丁基二月桂酸锡、辛酸铅、二醋酸二正丁基锡中的一种或两种及以上的混合物。
本发明的有益效果:采用本发明所述的制备方法制得的CHDI型耐高温热塑性聚氨酯弹性体具有更低的生产成本,更高的物理性能和耐高温特性,具体原理如下:
1)选用含70%-100%反式CHDI(其余0~30%是反式CHDI的同分异构体顺式CHDI)作二异氰酸酯原料:反式CHDI分子结构规整对称,能改善材料的微相分离程度,从根本上提高了TPU的耐热性能,提高材料本身的储能模量,降低了材料的力学内耗,使得材料表现出更加优异的物理性能和耐热性能;
2)采用平均官能度在2.1-2.3的混合扩链剂(1,4-丁二醇/三羟甲基丙烷TMP):采用在二官能度1,4-丁二醇扩链剂中加入适当三官能度扩链剂TMP的方法,使合成的TPU有适度的交联,有效抑制高温热氧老化导致聚氨酯高分子降解引起的物性急剧下降。
3)双螺杆挤出机反应器腔室的调整:通过调整反应器双螺杆挤出机的螺纹组态,使混合段比例缩短,适当增长反应腔室的比例,在延长停留时间和增强混合效率上取得更为平衡方式,使得所合成出的CHDI型聚氨酯既有足够大的数均分子量,分布宽度也比较窄。
通过本发明获得的CHDI型耐高温热塑性聚氨酯弹性体的主要技术指标:力学内耗测试:tanδ在0.01~0.1;玻璃化转变温度Tmg≤-70℃;维卡软化点≥250℃;分子量分布宽度(DMW):<2;数均分子量(Mn):50000-80000。
DSC分析测试玻璃化转变温度Tmg(参考GB19466-2标准);维卡软化点测试仪按ASTM D1525标准测试维卡软化点;凝胶液相高效色谱测试分子量分布宽度和TPU数均分子量。
具体实施方式
下面详细描述本发明的具体实施方案。
实施例1
向反应釜中加入占聚酯多元醇质量3.5‰的抗氧剂1024,占聚酯多元醇质量300ppm的辛酸亚锡,由己二酸和1,4-丁二醇缩合而成的数均分子质量为3000的聚酯多元醇,在115℃温度条件和-0.08~-0.1MPa真空度下脱水熔融混合5h后放到计量罐,打开计量罐搅拌并抽真空至-0.085MPa后停真空并充氮气,形成A组份备用;
将含75%反式CHDI,25%顺式CHDI的原料在80℃熔融并真空抽进计量罐中,形成B组份备用;
将1,4-丁二醇(BDO)在75℃熔融,三羟甲基丙烷(TMP)在75℃熔融,按摩尔比n(BDO):n(TMP)=17:3真空抽进计量罐中,-0.08~-0.1MPa真空度,搅拌混合、脱水4h,形成C组份备用;
将A组份、B组份、C组份分别通过高精度齿轮计量泵按质量比61.5:8.5:30【配方设计R(NCO/OH的比值)值=1.000】同时灌注到混合段比例为18%,反应段比例为82%的双螺杆挤出机中,设定挤出机转速为250RPM,设定1#~6#温度为130℃~180℃、7#~12#温度为195℃~170℃的条件下反应混合,经水下切粒得CHDI型耐高温热塑性聚氨酯弹性体颗粒。
主要技术指标:力学内耗测试:tanδ=0.03;玻璃化转变温度Tmg=-78.5℃;维卡软化点=254℃;分子量分布宽度(DMW):=1.91;数均分子量(Mn):70000。
实施例2
向反应釜中加入占聚酯多元醇质量3.5‰的抗氧剂1024,占聚酯多元醇质量300ppm的辛酸亚锡,由己二酸和1,4-丁二醇缩合而成的数均分子质量为3000的聚酯多元醇,在115℃温度条件和-0.08~-0.1MPa真空度下脱水熔融混合5h后放到计量罐,打开计量罐搅拌并抽真空至-0.085MPa后停真空并充氮气,形成A组份备用;
将含85%反式CHDI,15%顺式CHDI的原料在80℃熔融并真空抽进计量罐中,形成B组份备用;
将1,4-丁二醇(BDO)在75℃熔融,三羟甲基丙烷(TMP)在75℃熔融,按摩尔比n(BDO):n(TMP)=17:3真空抽进计量罐中,-0.08~-0.1MPa真空度,搅拌混合、脱水4h,形成C组份备用;
将A组份、B组份、C组份分别通过高精度齿轮计量泵按质量比61.5:8.5:30【配方设计R(NCO/OH的比值)值=1.000】同时灌注到混合段比例为18%,反应段比例为82%的双螺杆挤出机中,设定挤出机转速为250RPM,设定1#~6#温度为130℃~180℃、7#~12#温度为195℃~170℃的条件下反应混合,经水下切粒得CHDI型耐高温热塑性聚氨酯弹性体颗粒。
主要技术指标:力学内耗测试:tanδ=0.015;玻璃化转变温度Tmg=-78℃;维卡软化点=256℃;分子量分布宽度(DMW):=1.92;数均分子量(Mn):65000。
实施例3
向反应釜中加入占聚酯多元醇质量3.5‰的抗氧剂1024,占聚酯多元醇质量300ppm的辛酸亚锡,由己二酸和1,4-丁二醇缩合而成的数均分子质量为3000的聚酯多元醇,在115℃温度条件和-0.08~-0.1MPa真空度下脱水熔融混合5h后放到计量罐,打开计量罐搅拌并抽真空至-0.085MPa后停真空并充氮气,形成A组份备用;
将含95%反式CHDI,5%顺式CHDI的原料在80℃熔融并真空抽进计量罐中,形成B组份备用;
将1,4-丁二醇(BDO)在75℃熔融,三羟甲基丙烷(TMP)在75℃熔融,按摩尔比n(BDO):n(TMP)=17:3真空抽进计量罐中,-0.08~-0.1MPa真空度,搅拌混合、脱水4h,形成C组份备用;
将A组份、B组份、C组份分别通过高精度齿轮计量泵按质量比61.5:8.5:30【配方设计R(NCO/OH的比值)值=1.000】同时灌注到混合段比例为18%,反应段比例为82%的双螺杆挤出机中,设定挤出机转速为250RPM,设定1#~6#温度为130℃~180℃、7#~12#温度为195℃~170℃的条件下反应混合,经水下切粒得CHDI型耐高温热塑性聚氨酯弹性体颗粒。
主要技术指标:力学内耗测试:tanδ=0.042;玻璃化转变温度Tmg=-70.5℃;维卡软化点=267℃;分子量分布宽度(DMW):=1.95;数均分子量(Mn):78000。
实施例4
向反应釜中加入占聚酯多元醇质量3.5‰的抗氧剂1024,占聚酯多元醇质量300ppm的辛酸亚锡,由己二酸和1,4-丁二醇缩合而成的数均分子质量为3000的聚酯多元醇,在115℃温度条件和-0.08~-0.1MPa真空度下脱水熔融混合5h后放到计量罐,打开计量罐搅拌并抽真空至-0.085MPa后停真空并充氮气,形成A组份备用;
将含85%反式CHDI,15%顺式CHDI的原料在80℃熔融并真空抽进计量罐中,形成B组份备用;
将1,4-丁二醇(BDO)在75℃熔融,三羟甲基丙烷(TMP)在75℃熔融,按摩尔比n(BDO):n(TMP)=4:1真空抽进计量罐中,-0.08~-0.1MPa真空度,搅拌混合、脱水4h,形成C组份备用;
将A组份、B组份、C组份分别通过高精度齿轮计量泵按质量比61.5:8.5:30【配方设计R(NCO/OH的比值)值=1.000】同时灌注到混合段比例为18%,反应段比例为82%的双螺杆挤出机中,设定挤出机转速为250RPM,设定1#~6#温度为130℃~180℃、7#~12#温度为195℃~170℃的条件下反应混合,经水下切粒得CHDI型耐高温热塑性聚氨酯弹性体颗粒。
主要技术指标:力学内耗测试:tanδ=0.017;玻璃化转变温度Tmg=-77℃;维卡软化点=265℃;分子量分布宽度(DMW):=1.85;数均分子量(Mn):75000。
实施例5
向反应釜中加入占聚酯多元醇质量3.5‰的抗氧剂1024,占聚酯多元醇质量300ppm的辛酸亚锡,由己二酸和1,4-丁二醇缩合而成的数均分子质量为3000的聚酯多元醇,在115℃温度条件和-0.08~-0.1MPa真空度下脱水熔融混合5h后放到计量罐,打开计量罐搅拌并抽真空至-0.085MPa后停真空并充氮气,形成A组份备用;
将含85%反式CHDI,15%顺式CHDI的原料在80℃熔融并真空抽进计量罐中,形成B组份备用;
将1,4-丁二醇(BDO)在75℃熔融,三羟甲基丙烷(TMP)在75℃熔融,按摩尔比n(BDO):n(TMP)=3:1真空抽进计量罐中,-0.08~-0.1MPa真空度,搅拌混合、脱水4h,形成C组份备用;
将A组份、B组份、C组份分别通过高精度齿轮计量泵按质量比61.5:8.5:30【配方设计R(NCO/OH的比值)值=1.000】同时灌注到混合段比例为18%,反应段比例为82%的双螺杆挤出机中,设定挤出机转速为250RPM,设定1#~6#温度为130℃~180℃、7#~12#温度为195℃~170℃的条件下反应混合,经水下切粒得CHDI型耐高温热塑性聚氨酯弹性体颗粒。
主要技术指标:力学内耗测试:tanδ=0.05;玻璃化转变温度Tmg=-72℃;维卡软化点=263℃;分子量分布宽度(DMW):=1.895;数均分子量(Mn):72000。
实施例6
向反应釜中加入占聚酯多元醇质量3.5‰的抗氧剂1024,占聚酯多元醇质量300ppm的辛酸亚锡,由己二酸和1,4-丁二醇缩合而成的数均分子质量为3000的聚酯多元醇,在115℃温度条件和-0.08~-0.1MPa真空度下脱水熔融混合5h后放到计量罐,打开计量罐搅拌并抽真空至-0.085MPa后停真空并充氮气,形成A组份备用;
将含85%反式CHDI,15%顺式CHDI的原料在80℃熔融并真空抽进计量罐中,形成B组份备用;
将1,4-丁二醇(BDO)在75℃熔融,三羟甲基丙烷(TMP)在75℃熔融,按摩尔比n(BDO):n(TMP)=3:1真空抽进计量罐中,-0.08~-0.1MPa真空度,搅拌混合、脱水4h,形成C组份备用;
将A组份、B组份、C组份分别通过高精度齿轮计量泵按质量比61.5:8.5:30【配方设计R(NCO/OH的比值)值=1.000】同时灌注到混合段比例为15%,反应段比例为75%的双螺杆挤出机中,设定挤出机转速为250RPM,设定1#~6#温度为130℃~180℃、7#~12#温度为195℃~170℃的条件下反应混合,经水下切粒得CHDI型耐高温热塑性聚氨酯弹性体颗粒。
主要技术指标:力学内耗测试:tanδ=0.02;玻璃化转变温度Tmg=-73℃;维卡软化点=259℃;分子量分布宽度(DMW):=1.98;数均分子量(Mn):63000。
Claims (5)
1.一种耐高温热塑性聚氨酯弹性体的制备方法,其步骤为:
1)将抗氧剂、催化剂及在90~200℃熔融后的聚酯多元醇加入反应釜中;保持反应釜内温度为90~200℃,调整反应釜内压力至-0.08~-0.1MPa,脱水0.5~8h,然后调整反应釜内温度至75~115℃,通入氮气解除真空,形成A组份;
所述的抗氧剂占聚酯多元醇总质量的3~8‰,所述的催化剂占聚酯多元醇总质量的50~500ppm;
2)将二异氰酸酯加热至65~95℃,熔融后形成B组份;
3)将二元醇扩链剂加热至60~100℃熔融,将三元醇扩链剂加热至70~100℃熔融,将熔融后的三元醇与熔融后的二元醇按摩尔比1:2~1:6混合均匀,然后在压力为-0.08~-0.1MPa、温度为60~100℃条件下,脱水4~6h,形成C组份;
4)将挤出机的反应段比例调整增加至80~85%,将挤出机的混合段比例降低至15~20%;
5)将A组份、B组份、C组份按质量比55:10:35~68:7:25同时加入双螺杆挤出机中,经逐步聚合反应得到耐高温热塑性聚氨酯弹性体;
所述的聚酯多元醇由二元羧酸与二元醇经缩聚反应制得,聚酯多元醇的数均分子量为1000~6000;
所述的二异氰酸酯是由质量百分含量为70~100%的反式1,4-环己烷二异氰酸酯与质量百分含量为0~30%的顺式1,4-环己烷二异氰酸酯组成的混合物;
所述的三元醇为三羟甲基丙烷。
2.根据权利要求1所述的一种耐高温热塑性聚氨酯弹性体的制备方法,其特征在于:所述的二元羧酸为脂肪族二元羧酸或芳香族二元羧酸;所述的二元醇选自下述物质中的一种或几种:乙二醇、1,4-丁二醇、1,6-己二醇、2,2-二甲基-1,3-丙二醇。
3.根据权利要求1所述的一种耐高温热塑性聚氨酯弹性体的制备方法,其特征在于:所述的二元醇扩链剂为C4~C8的直链二醇、含苯环的对称二端羟基物、含苯环的非对称的二端羟基物中的一种或几种的混合。
4.根据权利要求1所述的一种耐高温热塑性聚氨酯弹性体的制备方法,其特征在于:所述的抗氧剂选自抗氧剂1010、抗氧剂1076、抗氧剂1024、抗氧剂1098、抗氧剂245中的一种或两种及以上的混合物。
5.根据权利要求1所述的一种耐高温热塑性聚氨酯弹性体的制备方法,其特征在于:所述的催化剂选自辛酸亚锡、二丁基二月桂酸锡、辛酸铅、二醋酸二正丁基锡中的一种或两种及以上的混合物。
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