CN105601883B - 用于低温绝热管道的聚氨酯硬泡绝热保温层及其制备方法 - Google Patents
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Abstract
本发明涉及一种高分子绝热保温材料技术领域,尤其涉及一种用于低温绝热管道的聚氨酯硬泡绝热保温层及其制备方法,是由不同特性的聚醚多元醇及聚酯多元醇按一定比例混合,与泡沫稳定剂、催化剂、阻燃剂等助剂及异氰酸酯反应制备得到。主要反应为:(1)多种聚醚多元醇与助剂充分混合形成特种组合聚醚多元醇;(2)特种组合聚醚多元醇与异氰酸酯反应:
Description
技术领域
本发明涉及一种高分子绝热保温材料技术领域,尤其涉及一种用于低温绝热管道的聚氨酯硬泡绝热保温层及其制备方法。
背景技术
低温绝热分为非真空绝热和真空绝热两大类,真空绝热由于需要将绝热空间抽成真空,对于大型的低温液体管道、储罐等应用场合,其技术难度和可行性等方面都存在一定的问题。所以在需要用到低温液体管道、储罐的工程中,广泛采用的是非真空绝热,即用低温绝热材料填充或包扎在低温管道上作为保温层。那么绝热材料和施工工艺就成为低温绝热工程中的关键技术。目前主要使用聚异氰脲酸酯(PIR)作为保温层的绝热材料。
聚异氰脲酸酯硬泡是由一种聚酯多元醇与异氰酸酯反应生成的一种泡沫体系,其原理为:聚异氰脲酸酯是由不同牌号的聚酯多元醇按一定比例的配方混合,加入一定量的催化剂、泡沫稳定剂、阻燃剂等,组成组合聚酯多元醇,再与过量的异氰酸酯(一般过量2-3倍)在聚合催化剂的作用下生成聚异氰脲酸酯。
聚异氰脲酸酯硬泡生产过程中的主要反应为:
(1)异氰酸酯和聚酯多元醇的反应RNCO+R'OH→RNHCOOR’;
(2)异氰酸酯的三聚反应:
(3)低温绝热工艺:用原料进行绝热层的预制。PIR低温绝热结构一般由防锈层,防潮层,保护层等组成。对碳钢、铸铁、铁素体合金钢等材质的管道,清除表面铁锈、油脂及污垢后刷防锈底漆。绝热层由PIR构成,是绝热材料的主体,绝热层绝热材料要预制、切割、拼接、捆绑,(需要多层使拼缝不重叠)、粘结剂的粘结,密封剂的涂抹。
以上存在如下问题:(1)异氰脲酸酯(PIR)发泡反应的原料流动性差,产品脆性大,粘结性不好。(2)PIR有急剧二次发泡的可能,会影响绝热层的性能。(3)反应速度慢,后熟化较晚。(4)工艺范围较窄,(生产温度高于60℃)生产较难控制。(5)由于发泡条件的苛刻,不能采用现场发泡的工艺。(6)PIR需要厂家在车间对绝热层进行预制,使运输量大大增加,运输和搬运的过程中不可避免的造成成品的损坏而废掉,既增加成本又污染了环境。(7)PIR制备原料虽然聚酯多元醇价格较低,但异氰酸酯价格较高,而且反应中异氰酸酯的用量是聚酯多元醇的2-3倍,所以整体价格较高。
发明内容
为了解决上述存在的问题,本发明提供了一种能够承受低温绝热环境的聚氨酯硬泡(PUR)绝热保温层,其特征在于所述的聚氨酯硬泡能够克服普通聚氨酯泡沫在热传递温差很大的情况下易发生收缩、开裂、粉化现象的弊端,适宜作为大型的低温液体管道、储罐等的保温层绝热材料。
一种用于低温绝热管道的聚氨酯硬泡绝热保温层,其特征在于,是由不同特性的聚醚多元醇及聚酯多元醇按一定比例混合,与泡沫稳定剂、催化剂、阻燃剂等助剂及异氰酸酯反应制备得到。
所述聚氨酯硬泡层在生产过程中所涉及的主要反应为:
(1)多种聚醚多元醇与助剂充分混合形成特种组合聚醚多元醇;
(2)特种组合聚醚多元醇与异氰酸酯反应:
本发明的聚氨酯硬泡层的原料如下,按重量份数计:
(1)聚醚多元醇:
杂醇基聚醚多元醇(羟值400-500mgKOH/g) 30-50份,
其它聚醚多元醇(羟值400-420mgKOH/g) 5-25份;
(2)聚酯多元醇(羟值200-400mgKOH/g) 5-20份;
(3)助剂及发泡剂:
交联剂 2-10份,
泡沫稳定剂 2-4份,
催化剂 1-7份,
水 1-6份,
阻燃剂 10-20份,
发泡剂 10-20份;
(4)异氰酸酯 65-140份。
按重量份数计,聚醚多元醇与聚酯多元醇:助剂及发泡剂:异氰酸酯=1:0.6~1.2:1.3~1.6。
对于配方中所用聚醚多元醇与聚酯多元醇:
所述杂醇基聚醚多元醇(羟值400-500mgKOH/g)是由木糖醇、山梨醇、甘露醇、季戊四醇、卫矛醇、环氧乙烷、环氧丙烷按15:12:7:3:1:4:3的重量比混合,由氢氧化钾做催化剂并在100℃-130℃条件下反应而成的;
所述其它聚醚多元醇(羟值400-420mgKOH/g)选取甘油基环氧乙烷聚醚多元醇、蔗糖基环氧乙烷聚醚多元醇、甘油基环氧丙烷聚醚多元醇、蔗糖基环氧丙烷聚醚多元醇中的两种或三种;
所述聚酯多元醇(羟值200-400mgKOH/g)选取苯酐聚酯多元醇、二甘醇聚酯多元醇中的一种或两种;
对于配方中所用助剂及发泡剂:
所述交联剂选取二甘醇、丙二醇、三乙醇胺中的两种或三种;
所述泡沫稳定剂选取有机硅表面活性剂;
所述催化剂为非金属催化剂,选取二甲基己胺、二甲基苄胺、三乙基二胺(33%的丙二醇溶剂)中的两种或三种;
所述水选取蒸馏水、去离子水中的一种或两种;
所述阻燃剂包括但不仅限于三(β—氯乙基磷酸酯)、甲基膦酸二甲酯;
所述发泡剂优选取一氟二氯乙烷141b、五氟丁烷365mfc中的一种或两种。
所述异氰酸酯选取二苯基甲烷二异氰酸酯(MDI)、甲苯-2,4-二异氰酸酯(TDI)中的一种或两种。
上述适用于低温绝热管道的聚氨酯硬泡绝热保温层的制备方法,采用现场发泡,具体步骤为:
(1)常温下,对管道进行打压、试漏、除锈;
(2)缓冲层制备:常温下,在管道上缠玻璃布3-5层,以给管道热胀冷缩预留缓冲空间;
(3)聚氨酯硬泡绝热层制备:在缓冲层外固定模具,在反应釜中混合聚醚多元醇、聚酯多元醇、助剂及发泡剂,与异氰酸酯在常温下机械搅拌并迅速注入模具中,一体发泡15分钟,形成防腐绝热的聚氨酯硬泡绝热层;
(4)树脂保护层制备:常温下,在聚氨酯硬泡保温层外部缠绕玻璃布5-10层,刷树脂,以加固并保护聚氨酯绝热层;
(5)铝皮保护层制备:常温下,在树脂保护层外部包裹一层铝皮,以保护低温绝热管道防火。
有益效果:
相对于PIR的不足,PUR具有很强的优势:(1)原料发泡具有很好的流动性,成品不脆粘结性好;(2)PUR没有发生二次反应的可能,后熟化快;(3)反应速度空间很大,可根据现场需要任意调整;(4)反应时需要料温20~30℃,环境温度20~45℃,工艺温度范围容易控制;(5)可以采用现场发泡工艺,降低了运输成本;(6)反应过程中不需要过量的异氰酸酯,原料总成本低于PIR原料总成本(7)能够承受绝热环境及-195℃甚至更低的温度,适用于大型的低温液体管道、储罐等应用场合。
具体实施方式
实施例1:
一种聚氨酯硬泡(PUR)材料,聚氨酯硬泡材料原料的组成,由以下组分构成:
(1)聚醚多元醇,
杂醇基聚醚多元醇(羟值400-500mgKOH/g) 30份,
甘油基环氧乙烷聚醚多元醇(羟值400-420mgKOH/g) 2份,
蔗糖基环氧丙烷聚醚多元醇(羟值400-420mgKOH/g) 3份;
其中,所述杂醇基聚醚多元醇(羟值400-500mgKOH/g)是由木糖醇10份、山梨醇7份、甘露醇4份、季戊四醇2份、卫矛醇0.7份、环氧乙烷5份、环氧丙烷1.3份混合并在130℃条件下以氢氧化钾为催化剂反应而成的;
(2)苯酐聚酯多元醇(羟值200-400mgKOH/g) 5份;
(3)助剂及发泡剂,
二甘醇1份,丙二醇1份,
有机硅表面活性剂2份,
二甲基己胺0.5份,二甲基苄胺0.5份,
蒸馏水1份,
三(β—氯乙基磷酸酯) 10份,
一氟二氯乙烷141b 10份;
(4)二苯基甲烷二异氰酸酯(MDI) 65份。
所述用于低温绝热管道的聚氨酯硬泡绝热保温层的制备方法,采用现场发泡,具体步骤为:
(1)常温下,对管道进行打压、试漏、除锈;
(2)缓冲层制备:常温下,在管道上缠玻璃布3-5层,以给管道热胀冷缩预留缓冲空间;
(3)聚氨酯硬泡绝热层制备:在缓冲层外固定模具,在反应釜中混合聚醚多元醇、聚酯多元醇、助剂及发泡剂,与异氰酸酯在常温下机械搅拌并迅速注入模具中,一体发泡15分钟,形成防腐绝热的聚氨酯硬泡绝热层;
(4)树脂保护层制备:常温下,在聚氨酯硬泡保温层外部缠绕玻璃布5层,刷树脂,以加固并保护聚氨酯绝热层;
(5)铝皮保护层制备:常温下,在树脂保护层外部包裹一层铝皮,以保护低温绝热管道防火。
实施例2:
一种聚氨酯硬泡(PUR)材料,聚氨酯硬泡材料原料的组成,由以下组分构成:
(1)聚醚多元醇,
杂醇基聚醚多元醇(羟值400-500mgKOH/g) 40份,
甘油基环氧丙烷聚醚多元醇(羟值400-420mgKOH/g) 5份,
蔗糖基环氧乙烷聚醚多元醇(羟值400-420mgKOH/g) 5份;
其中,所述杂醇基聚醚多元醇(羟值400-500mgKOH/g)是由木糖醇11份、山梨醇8份、甘露醇5份、季戊四醇2份、卫矛醇0.8份、环氧乙烷9份、环氧丙烷4.2份混合并在120℃条件下以氢氧化钾为催化剂反应而成的;
(2)二甘醇聚酯多元醇(羟值200-400mgKOH/g)9份;
(3)助剂及发泡剂,
二甘醇3份,三乙醇胺3份,
有机硅表面活性剂3份,
二甲基己胺0.5份,二甲基苄胺0.5份,
蒸馏水1.6份,
甲基膦酸二甲酯 10份,
五氟丁烷365mfc 10份;
(4)二苯基甲烷二异氰酸酯(MDI) 90份。
所述用于低温绝热管道的聚氨酯硬泡绝热保温层的制备方法,采用现场发泡,具体步骤为:
(1)常温下,对管道进行打压、试漏、除锈;
(2)缓冲层制备:常温下,在管道上缠玻璃布3-5层,以给管道热胀冷缩预留缓冲空间;
(3)聚氨酯硬泡绝热层制备:在缓冲层外固定模具,在反应釜中混合聚醚多元醇、聚酯多元醇、助剂及发泡剂,与异氰酸酯在常温下机械搅拌并迅速注入模具中,一体发泡15分钟,形成防腐绝热的聚氨酯硬泡绝热层;
(4)树脂保护层制备:常温下,在聚氨酯硬泡保温层外部缠绕玻璃布10层,刷树脂,以加固并保护聚氨酯绝热层;
(5)铝皮保护层制备:常温下,在树脂保护层外部包裹一层铝皮,以保护低温绝热管道防火。
实施例3:
一种聚氨酯硬泡(PUR)材料,聚氨酯硬泡材料原料的组成,由以下组分构成:
(1)聚醚多元醇,
杂醇基聚醚多元醇(羟值400-500mgKOH/g) 35份,
甘油基环氧丙烷聚醚多元醇(羟值400-420mgKOH/g) 3份,
蔗糖基环氧乙烷聚醚多元醇(羟值400-420mgKOH/g) 7份;
其中,所述杂醇基聚醚多元醇(羟值400-500mgKOH/g)是由木糖醇9份、山梨醇7份、甘露醇4份、季戊四醇1份、卫矛醇6份、环氧乙烷7份、环氧丙烷1份混合并在110℃条件下以氢氧化钾为催化剂反应而成的;
(2)二甘醇聚酯多元醇(羟值200-400mgKOH/g)10份;
(3)助剂及发泡剂,
二甘醇3份,三乙醇胺3份,
有机硅表面活性剂3份,
二甲基己胺2.5份,二甲基苄胺2.5份,
蒸馏水2.6份,
三(β—氯乙基磷酸酯) 15份,
五氟丁烷365mfc 16份;
(4)二苯基甲烷二异氰酸酯(MDI) 100份。
所述用于低温绝热管道的聚氨酯硬泡绝热保温层的制备方法,采用现场发泡,具体步骤为:
(1)常温下,对管道进行打压、试漏、除锈;
(2)缓冲层制备:常温下,在管道上缠玻璃布3-5层,以给管道热胀冷缩预留缓冲空间;
(3)聚氨酯硬泡绝热层制备:在缓冲层外固定模具,在反应釜中混合聚醚多元醇、聚酯多元醇、助剂及发泡剂,与异氰酸酯在常温下机械搅拌并迅速注入模具中,一体发泡15分钟,形成防腐绝热的聚氨酯硬泡绝热层;
(4)树脂保护层制备:常温下,在聚氨酯硬泡保护层外部缠绕玻璃布8层,刷树脂,以加固并保护聚氨酯绝热层;
(5)铝皮保护层制备:常温下,在树脂保温层外部包裹一层铝皮,以保护低温绝热管道防火。
实施例:4:一种聚氨酯硬泡(PUR)材料,聚氨酯硬泡材料原料的组成,由以下组分构成:
(1)聚醚多元醇,
杂醇基聚醚多元醇(羟值400-500mgKOH/g) 50份,
甘油基环氧丙烷聚醚多元醇(羟值400-420mgKOH/g) 10份,
蔗糖基环氧乙烷聚醚多元醇(羟值400-420mgKOH/g) 15份;
其中,所述杂醇基聚醚多元醇(羟值400-500mgKOH/g)是由木糖醇15份、山梨醇10份、甘露醇6份、季戊四醇4份、卫矛醇3份、环氧乙烷8份、环氧丙烷4份混合并在110℃条件下以氢氧化钾为催化剂反应而成的;
(2)二甘醇聚酯多元醇(羟值200-400mgKOH/g)20份;
(3)助剂及发泡剂,
二甘醇4份,三乙醇胺3份,
有机硅表面活性剂4份,
二甲基己胺3份,二甲基苄胺3份,
蒸馏水2.8份,
三(β—氯乙基磷酸酯) 17份,
五氟丁烷365mfc 16份;
(4)二苯基甲烷二异氰酸酯(MDI) 140份。
所述用于低温绝热管道的聚氨酯硬泡绝热保温层的制备方法,采用现场发泡,具体步骤为:
(1)常温下,对管道进行打压、试漏、除锈;
(2)缓冲层制备:常温下,在管道上缠玻璃布3-5层,以给管道热胀冷缩预留缓冲空间;
(3)聚氨酯硬泡绝热层制备:在缓冲层外固定模具,在反应釜中混合聚醚多元醇、聚酯多元醇、助剂及发泡剂,与异氰酸酯在常温下机械搅拌并迅速注入模具中,一体发泡15分钟,形成防腐绝热的聚氨酯硬泡绝热层;
(4)树脂保护层制备:常温下,在聚氨酯硬泡保护层外部缠绕玻璃布8层,刷树脂,以加固并保护聚氨酯绝热层;
(5)铝皮保护层制备:常温下,在树脂保温层外部包裹一层铝皮,以保护低温绝热管道防火。
对比实施例1:
以下是在模拟的低温绝热环境下,根据实施例3所述方法生产的聚氨酯硬泡与聚异氰脲酸酯硬泡性能对比表,其检测依据为“cini 2.7.01;GB/T29047-2012《高密度聚乙烯外护管硬质聚氨酯泡沫塑料预制直埋保温管及管件》标准”:
由上表可知,虽然根据实施例3制得的聚氨酯硬泡与聚异氰脲酸酯硬泡的各个检测项目均符合质检所规定的性能指标,但是通过检测结果可以确定,聚氨酯硬泡的各方面性能均高于聚异氰脲酸酯硬泡的性能,因此根据本发明所提供的配方及方法制得的聚氨酯硬泡更加适合于低温绝热环境。
对比实施例2:
以下是PIR作为保温层与PUR作为保温层的性能对比表:
在本发明及上述实施例的教导下,本领域技术人员很容易预见到,本发明所列举的各原料和方法都能实现本发明,以及各原料和工艺的上下限取值、区间值都能实现本发明,在此不一一列举实施例。
Claims (7)
1.用于低温绝热管道的聚氨酯硬泡绝热保温层,其特征在于,是由不同特性的聚醚多元醇及聚酯多元醇按一定比例混合,与泡沫稳定剂、催化剂、阻燃剂等助剂及异氰酸酯反应制备得到,所述聚氨酯硬泡层在生产过程中所涉及的主要反应为:
(1)多种聚醚多元醇与助剂充分混合形成特种组合聚醚多元醇;
(2)特种组合聚醚多元醇与异氰酸酯反应如下:
聚氨酯硬泡材料原料的组成如下,以重量份数计:
(1)聚醚多元醇
杂醇基聚醚多元醇,羟值400-500mgKOH/g,30-50份,
其它聚醚多元醇,羟值400-420mgKOH/g,5-25份,
(2)聚酯多元醇,羟值200-400mgKOH/g,5-20份,
(3)助剂及发泡剂,
交联剂 2-10份,
泡沫稳定剂 2-4份,
催化剂 1-7份,
水 1-6份,
阻燃剂 10-20份,
发泡剂 10-20份,
(4)异氰酸酯 65-140份,
按重量份数计,聚醚多元醇与聚酯多元醇:助剂及发泡剂:异氰酸酯=1:0.6~1.2:1.3~1.6;
对于配方中所用聚醚多元醇与聚酯多元醇:
所述杂醇基聚醚多元醇,羟值400-500mgKOH/g,是由木糖醇、山梨醇、甘露醇、季戊四醇、卫矛醇、环氧乙烷、环氧丙烷按15:12:7:3:1:4:3的重量比混合,由氢氧化钾做催化剂并在100℃-130℃条件下反应而成的,
所述其它聚醚多元醇,羟值400-420mgKOH/g,选取甘油基环氧乙烷聚醚多元醇、蔗糖基环氧乙烷聚醚多元醇、甘油基环氧丙烷聚醚多元醇、蔗糖基环氧丙烷聚醚多元醇中的两种或三种,
所述聚酯多元醇,羟值200-400mgKOH/g,选取苯酐聚酯多元醇、二甘醇聚酯多元醇中的一种或两种,
对于配方中所用助剂及发泡剂,
所述交联剂选取二甘醇、丙二醇、三乙醇胺中的两种或三种,
所述泡沫稳定剂选取有机硅表面活性剂,
所述催化剂为非金属催化剂,选取二甲基己胺、二甲基苄胺、三亚乙基二胺中的两种或三种,
所述水选取蒸馏水、去离子水中的一种或两种,
所述阻燃剂包括三(β-氯乙基)磷酸酯、甲基膦酸二甲酯,
所述发泡剂优选取一氟二氯乙烷141b、五氟丁烷365mfc中的一种或两种,
所述异氰酸酯选取二苯基甲烷二异氰酸酯、甲苯-2,4-二异氰酸酯中的一种或两种。
2.用于低温绝热管道的聚氨酯硬泡绝热保温层,其特征在于,聚氨酯硬泡材料原料的组成如下,以重量份数计:
(1)聚醚多元醇,
杂醇基聚醚多元醇,羟值400-500mgKOH/g,30份,
甘油基环氧乙烷聚醚多元醇,羟值400-420mgKOH/g,2份,
蔗糖基环氧丙烷聚醚多元醇,羟值400-420mgKOH/g,3份;
其中,所述杂醇基聚醚多元醇,羟值400-500mgKOH/g,是由木糖醇10份、山梨醇7份、甘露醇4份、季戊四醇2份、卫矛醇0.7份、环氧乙烷5份、环氧丙烷1.3份混合并在130℃条件下以氢氧化钾为催化剂反应而成的;
(2)苯酐聚酯多元醇,羟值200-400mgKOH/g,5份;
(3)助剂及发泡剂,
二甘醇1份,丙二醇1份,
有机硅表面活性剂2份,
二甲基己胺0.5份,二甲基苄胺0.5份,
蒸馏水1份,
三(β—氯乙基)磷酸酯10份,
一氟二氯乙烷141b 10份;
(4)二苯基甲烷二异氰酸酯65份。
3.用于低温绝热管道的聚氨酯硬泡绝热保温层,其特征在于,聚氨酯硬泡材料原料的组成如下,以重量份数计:
(1)聚醚多元醇,
杂醇基聚醚多元醇,羟值400-500mgKOH/g,40份,
甘油基环氧丙烷聚醚多元醇,羟值400-420mgKOH/g,5份,
蔗糖基环氧乙烷聚醚多元醇,羟值400-420mgKOH/g,5份;
其中,所述杂醇基聚醚多元醇,羟值400-500mgKOH/g,是由木糖醇11份、山梨醇8份、甘露醇5份、季戊四醇2份、卫矛醇0.8份、环氧乙烷9份、环氧丙烷4.2份混合并在120℃条件下以氢氧化钾为催化剂反应而成的;
(2)二甘醇聚酯多元醇,羟值200-400mgKOH/g,9份;
(3)助剂及发泡剂,
二甘醇3份,三乙醇胺3份,
有机硅表面活性剂3份,
二甲基己胺0.5份,二甲基苄胺0.5份,
蒸馏水1.6份,
甲基膦酸二甲酯10份,
五氟丁烷365mfc 10份;
(4)二苯基甲烷二异氰酸酯90份。
4.用于低温绝热管道的聚氨酯硬泡绝热保温层,其特征在于,聚氨酯硬泡材料原料的组成如下,以重量份数计:
(1)聚醚多元醇,
杂醇基聚醚多元醇,羟值400-500mgKOH/g,35份,
甘油基环氧丙烷聚醚多元醇,羟值400-420mgKOH/g,3份,
蔗糖基环氧乙烷聚醚多元醇,羟值400-420mgKOH/g,7份;
其中,所述杂醇基聚醚多元醇,羟值400-500mgKOH/g,是由木糖醇9份、山梨醇7份、甘露醇4份、季戊四醇1份、卫矛醇6份、环氧乙烷7份、环氧丙烷1份混合并在110℃条件下以氢氧化钾为催化剂反应而成的;
(2)二甘醇聚酯多元醇,羟值200-400mgKOH/g,10份;
(3)助剂及发泡剂,
二甘醇3份,三乙醇胺3份,
有机硅表面活性剂3份,
二甲基己胺2.5份,二甲基苄胺2.5份,
蒸馏水2.6份,
三(β—氯乙基)磷酸酯15份,
五氟丁烷365mfc 16份;
(4)二苯基甲烷二异氰酸酯100份。
5.用于低温绝热管道的聚氨酯硬泡绝热保温层,其特征在于,聚氨酯硬泡材料原料的组成如下,以重量份数计:
(1)聚醚多元醇,
杂醇基聚醚多元醇,羟值400-500mgKOH/g,50份,
甘油基环氧丙烷聚醚多元醇,羟值400-420mgKOH/g,10份,
蔗糖基环氧乙烷聚醚多元醇,羟值400-420mgKOH/g,15份;
其中,所述杂醇基聚醚多元醇,羟值400-500mgKOH/g,是由木糖醇15份、山梨醇10份、甘露醇6份、季戊四醇4份、卫矛醇3份、环氧乙烷8份、环氧丙烷4份混合并在110℃条件下以氢氧化钾为催化剂反应而成的;
(2)二甘醇聚酯多元醇,羟值200-400mgKOH/g,20份;
(3)助剂及发泡剂,
二甘醇4份,三乙醇胺3份,
有机硅表面活性剂4份,
二甲基己胺3份,二甲基苄胺3份,
蒸馏水2.8份,
三(β—氯乙基)磷酸酯17份,
五氟丁烷365mfc 16份;
(4)二苯基甲烷二异氰酸酯140份。
6.如权利要求1所述的用于低温绝热管道的聚氨酯硬泡绝热保温层的制备方法,其特征在于,具体步骤如下:
(1)常温下,对管道进行打压、试漏、除锈;
(2)缓冲层制备:常温下,在管道上缠玻璃布3-5层,以给管道热胀冷缩预留缓冲空间;
(3)聚氨酯硬泡绝热层制备:在缓冲层外固定模具,在反应釜中混合聚醚多元醇、聚酯多元醇、助剂及发泡剂,与异氰酸酯在常温下机械搅拌并迅速注入模具中,一体发泡15分钟,形成防腐绝热的聚氨酯硬泡绝热层;
(4)树脂保护层制备:常温下,在聚氨酯硬泡保护层外部缠绕玻璃布5-10层,刷树脂,以加固并保护聚氨酯绝热层;
(5)铝皮保护层制备:常温下,在树脂保护层外部包裹一层铝皮,以保护低温绝热管道防火。
7.如权利要求6所述的用于低温绝热管道的聚氨酯硬泡绝热保温层的制备方法,其特征在于,采用现场发泡。
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