CN114634700A - 一种气凝胶改性聚氨酯泡沫隔热板及其制备方法 - Google Patents
一种气凝胶改性聚氨酯泡沫隔热板及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种气凝胶改性聚氨酯泡沫隔热板,包括聚氨酯泡沫芯和至少一个隔热包,隔热包设置于聚氨酯泡沫芯内部,聚氨酯泡沫包裹着隔热包,隔热包在隔热板中的体积比为10%‑90%;隔热包包括由具有阻气作用的阻隔薄膜围成的外壳体,外壳体内填充有隔热材料和至少一个吸气包,隔热材料包括1‑60wt%气凝胶和40‑99wt%无机纤维,优选15‑60wt%气凝胶和40‑85wt%无机纤维,或者25‑60wt%气凝胶和40‑75wt%无机纤维;吸气包内填充有金属氧化物,金属氧化物包括氧化钙,吸气包的设置量根据隔热包的面积确定,控制吸气包≤5g/m2。本发明的隔热板导热系数低,隔热性能好,使用寿命长。
Description
技术领域
本发明涉及隔热板材技术领域,具体涉及一种气凝胶改性聚氨酯泡沫隔热板及其制备方法。
背景技术
建筑板指用于商业和住宅的隔离结构,通常是玻璃纤维或者聚氨酯泡沫为基材的复合板材。聚氨酯硬质泡沫是以异氰酸酯和聚醚为主要原料,在发泡剂、催化剂、阻燃剂等多种助剂的作用下,通过专用设备混合,经高压喷涂现场发泡而成的高分子聚合物。聚氨酯具有较好的隔热性能,通常,市面上聚氨酯泡沫建筑板的导热系数在0.022-0.024W/m.K,且轻质、无腐蚀性、易于切割,通过化学改性,聚氨酯泡沫建筑板还可以具备优异的阻燃性、防烟扩散性、机械性能。但是,现有的聚氨酯泡沫建筑板的隔热性能不能满足某些对隔热性能要求高的场合,由于冬天保温和夏天隔热以及防火阻燃的需求,建筑行业需要隔热性能更好的建筑板;石油或天然气精炼厂、化工厂、汽车、动车、船体、航空航天等领域也需要隔热性能和阻燃性能更为优异的隔热板材。通过对聚氨酯泡沫改性,尽可能降低聚氨酯泡沫的导热系数,同时不影响阻燃性能,满足以上领域对建筑板的高要求。
气凝胶是一种多孔、重量超轻的材料,通常通过溶胶-凝胶工艺制成。气凝胶是一种出色的绝热体,通常含有98%的空气,孔径极小,仅10-40纳米。气凝胶,例如二氧化硅气凝胶,本身是亲水的,这是因为其拥有像海绵一样的纳米结构,一块冰块大小气凝胶的表面积相当于半个足球场大,足以吸附很多水分子;另外气凝胶结构表面覆盖着会吸附水分子的氧氢基团;通过化学处理可以使其疏水、防潮。
发明内容
本发明的目的是针对上述问题,提供一种导热系数低、使用寿命长的气凝胶改性聚氨酯泡沫隔热板。
本发明为了实现其目的,采用的技术方案是:
一种气凝胶改性聚氨酯泡沫隔热板,包括聚氨酯泡沫芯和至少一个隔热包,所述隔热包设置于聚氨酯泡沫芯内部,聚氨酯泡沫包裹着隔热包,隔热包在所述隔热板中的体积比为10%-90%,优选30-70%;
隔热包包括由具有阻气作用的阻隔薄膜围成的外壳体,所述外壳体内填充有隔热材料和至少一个吸气包,所述隔热材料包括1-60wt%气凝胶和40-99wt%无机纤维,优选15-60wt%气凝胶和40-85wt%无机纤维,或者25-60wt%气凝胶和40-75wt%无机纤维;
所述吸气包内填充有金属氧化物,所述金属氧化物包括氧化钙,吸气包的设置量根据隔热包的面积确定,控制吸气包≤5g/m2;
所述隔热包的导热系数为0.001-0.010w/m.k。
优选地,所述阻隔薄膜为铝箔复合膜,优选玻纤布/AL/PET/CPE复合膜或者玻纤布/AL/PET/NY/CPE复合膜;
所述吸气包的外包体材质为具有防水透气性能的材料,优选高密度聚乙烯材料,优选Tyvek杜邦纸;金属氧化物填充在外包体内;
所述金属氧化物还包括铜氧化物、铈氧化物;金属氧化物中氧化钙的质量百分比为98-99.5%,余量为铜氧化物和/或铈氧化物,铜氧化物、铈氧化物以任意比例混合。
优选地,所述气凝胶、无机纤维和吸气包密封在隔热包的外壳体中,且外壳体内抽真空密封以提高隔热效果;
优选所述聚氨酯泡沫芯外复合有装饰面,优选所述装饰面为膜、涂布纸、无纺布、铝膜压饰面或不锈钢框体。
优选地,所述气凝胶选自有机气凝胶、聚酰亚胺气凝胶或聚氨酯气凝胶,优选二氧化硅气凝胶;所述无机纤维选自玻璃纤维、玄武岩纤维和陶瓷纤维中的一种或多种混合;优选聚氨酯泡沫芯含有阻燃剂。
优选地,所述隔热材料还包括黑色材料,所述黑色材料为炭黑、氧化铁、五氧化三钛中的一种或多种混合物;
黑色材料的比表面积为10-360m2/g,优选70-150m2/g;
黑色材料在隔热材料中的质量比为0%-10%,优选2-8%或3-5%;
黑色材料的平均粒度≤10um。
优选地,所述隔热材料还包括其它材料,所述其它材料选自膨胀珍珠岩、沉淀二氧化硅、碳酸钙、滑石粉或氢氧化镁;
所述隔热包或吸气包为长方体形、立方体形、球形或圆柱体形。
所述隔热板的厚度为0.6cm-10cm,隔热包厚度为0.49-0.98cm,导热系数≤0.015w/m.k,火焰蔓延指数≤30,烟雾指数≤300。
上述的气凝胶改性聚氨酯泡沫隔热板的制备方法,包括如下步骤:
1)制备隔热包:将隔热材料和吸气包密封在阻隔薄膜内制得隔热包;
2)将隔热包放置在隔热板制备模具中;
3)将聚氨酯液体泡沫倾倒进隔热板制备模具中,且确保隔热包完全被泡沫材料包裹;
4)让泡沫材料硬化定型形成最终产品。
在上述制备方法中,所述聚氨酯液体泡沫中含有阻燃剂,所述阻燃剂为卤素阻燃剂或非卤素阻燃剂,优选磷酸三酯,羟乙基膦酸二乙酯,磷酸三乙酯、氢氧化铝,氢氧化镁或氧化钼。
优选地,所述制备方法还包括步骤5)对隔热板进行装饰,所述装饰包括在表面涂颜色、在表面复合装饰面,优选所述装饰面为膜、涂布纸、无纺布、铝膜压饰面或不锈钢框体。
隔热包通过抽真空密封以提高隔热效果,在使用过程中,少量气体会透过气体阻隔薄膜慢慢渗入到隔热包内,密封在内部的材料也会随时间缓慢释放气体,当隔热包中真空度逐渐降低时,带来的空气热传导效应会使导热系数增加,从而降低隔热板的隔热效果。吸气包能够延长隔热包真空度的保持时间,在实际使用过程中增加隔热板的使用寿命。
气凝胶具有多孔、超轻的材料性质,通常含有98%的空气,使用在隔热包中,对热传导的三个途径都有阻隔作用。气凝胶中气孔孔径小,气孔内的空气分子失去了自在活动的能力,处于近似真空状况,减少对流带来的热量传递,大量的气孔壁阻隔了热辐射的传递,加长了热传导路径。因此在聚氨酯泡沫建筑板中使用气凝胶能够进一步降低隔热板的导热系数。
无机纤维是给隔热包提供骨架结构,能够确保真空度。真空的环境能减少热传达,从而实现隔热效果。
黑色材料起到黑体辐射器的作用,可以与气凝胶混合,起到辐射吸收剂的作用,以减少或抑制由于辐射引起的热量或热能传递。
本发明的有益效果是:本发明的隔热板兼具聚氨酯泡沫建筑板轻质、无腐蚀性、易于切割的优点;通过将气凝胶填充在阻隔薄膜保护外壳中再包裹在聚氨酯泡沫中,具有封装气凝胶的聚氨酯泡沫板表现出的导热系数远远低于类似构造的传统聚氨酯泡沫板,同时具备了优异的阻燃性能。本发明的聚氨酯泡沫隔热板更适合用于隔热结构,并可用于各种隔热应用,比如商业和住宅的建筑隔离结构,也可用于石油或天然气精炼厂、化工厂、汽车、动车、船体、航空航天领域中。
附图说明
图1是本发明的气凝胶改性聚氨酯泡沫隔热板的结构示意图;
图2是图1中的隔热包的内部结构示意图;
图中,
1-隔热板,2-隔热包,3-聚氨酯泡沫芯,4-吸气包,5-隔热材料。
具体实施方式
下面结合实施例对本发明作进一步说明,但并不因此而限制本发明。
下述实施例中的实验方法,如无特别说明,均为常规方法;所用原材料如无特别说明,均为本技术领域常规原材料,均可商购获得。
如图1、2所示的本发明的一种气凝胶改性聚氨酯泡沫隔热板1,包括聚氨酯泡沫芯3和至少一个隔热包2,所述隔热包2设置于聚氨酯泡沫芯3内部,聚氨酯泡沫包裹着隔热包2,隔热包2在所述隔热板1中的体积比为10%-90%,优选30-70%;隔热包2包括由具有阻气作用的阻隔薄膜围成的外壳体,所述外壳体内填充有隔热材料5和至少一个吸气包4,所述隔热材料5包括1-60wt%气凝胶和40-99wt%无机纤维,优选15-60wt%气凝胶和40-85wt%无机纤维,或者25-60wt%气凝胶和40-75wt%无机纤维;所述吸气包4内填充有金属氧化物,所述金属氧化物包括氧化钙,吸气包4的设置量根据隔热包2的面积确定,控制吸气包≤5g/m2;所述隔热包2的导热系数为0.001-0.010w/m.k。
在一些技术方案中,所述阻隔薄膜为铝箔复合膜,优选玻纤布/AL/PET/CPE复合膜或者玻纤布/AL/PET/NY/CPE复合膜;所述吸气包的外包体材质为具有防水透气性能的材料,优选高密度聚乙烯材料,优选Tyvek杜邦纸;金属氧化物填充在外包体内;
在一些技术方案中,所述金属氧化物还包括铜氧化物、铈氧化物;金属氧化物中氧化钙的质量百分比为98-99.5%,余量为铜氧化物和/或铈氧化物,铜氧化物、铈氧化物以任意比例混合。
所述气凝胶、无机纤维和吸气包密封在隔热包的外壳体中,且外壳体内抽真空密封以提高隔热效果;优选所述聚氨酯泡沫芯外复合有装饰面,优选所述装饰面为膜、涂布纸、无纺布、铝膜压饰面或不锈钢框体。
所述气凝胶选自有机气凝胶、聚酰亚胺气凝胶或聚氨酯气凝胶,优选二氧化硅气凝胶;所述无机纤维选自玻璃纤维、玄武岩纤维和陶瓷纤维中的一种或多种混合;优选聚氨酯泡沫芯含有阻燃剂。
在一些技术方案中,所述隔热材料还包括黑色材料,所述黑色材料为炭黑、氧化铁、五氧化三钛中的一种或多种混合物;黑色材料的比表面积为10-360m2/g,优选70-150m2/g;黑色材料在隔热材料中的质量比为0%-10%,优选2-8%或3-5%;黑色材料的平均粒度≤10um。
在一些技术方案中,所述隔热材料还包括其它材料,所述其它材料选自膨胀珍珠岩、沉淀二氧化硅、碳酸钙、滑石粉或氢氧化镁;
所述隔热包或吸气包为长方体形、立方体形、球形或圆柱体形。
本发明的隔热板的厚度为0.6cm-10cm,隔热包厚度为0.49-0.98cm,导热系数≤0.015w/m.k,火焰蔓延指数≤30,烟雾指数≤300。
上述气凝胶改性聚氨酯泡沫隔热板的制备方法,按照如下步骤操作:
1)制备隔热包:将隔热材料和吸气包密封在阻隔薄膜内制得隔热包;
2)将隔热包放置在隔热板制备模具中;
3)将聚氨酯液体泡沫倾倒进隔热板制备模具中,且确保隔热包完全被泡沫材料包裹;所述聚氨酯液体泡沫中含有阻燃剂,所述阻燃剂为卤素阻燃剂或非卤素阻燃剂,优选磷酸三酯,羟乙基膦酸二乙酯,磷酸三乙酯、氢氧化铝,氢氧化镁或氧化钼。
4)让泡沫材料硬化定型形成最终产品。
5)对隔热板进行装饰,所述装饰包括在表面涂颜色、在表面复合装饰面,优选所述装饰面为膜、涂布纸、无纺布、铝膜压饰面或不锈钢框体。
按照上述的方法制备本发明的气凝胶改性聚氨酯泡沫隔热板,原料和配比如表1中所示,表1中吸气包g/m2是指每平米隔热包中吸气包的质量。
本发明实施例1-6和对比例1-4的黑色材料采用炭黑,所用的炭黑的比表面积为80m2/g的炭黑,粒度8um;气凝胶采用二氧化硅气凝胶,无机纤维采用平均纤维直径为3.5um的玻璃纤维棉,吸气包内含有98%的氧化钙、1%的铜氧化物、1%的铈氧化物。
将制得的隔热板制备成300mm×300mm的小板进行测试检测产品性能,检测结果如表1中所示:
火焰蔓延指数和烟雾指数根据ASTME84《建筑材料表面燃烧性能的测定方法》,
导热系数采用ASTMC518-2017《采用热流计仪器法测定稳态热传递特性的标准试验方法》。
表1
将实施例2-6中的气凝胶换成聚酰亚胺气凝胶或聚氨酯气凝胶,或者无机纤维换成玄武岩纤维或陶瓷纤维,或者黑色材料换为氧化铁或五氧化三钛时,得到的隔热板的产品性能与表1中实施例2-6中的产品性能类似,导热系数在0.008~0.020w/m.k之间。
在本领域技术中,通常一个隔热板的导热系数变化0.001w/m.k都是十分困难的,0.001w/m.k的变化在本领域技术中即是显著的变化。
从对比例1、2、3和实施例1-6的对比可以看出,设置隔热包和吸气包后,产品的导热系数进一步降低,隔热性能更好。
从对比例3和实施例5的对比能看出来,在隔热材料中添加黑色材料能进一步降低导热系数。
对比例4与实施例5对比,对比例4中没有使用吸气包,实施例5中使用了吸气包,两组实验样品具备相近的导热系数、火焰蔓延指数、烟雾指数。对两组实验样品进行老化处理,老化的实验条件为:将样品置于80℃,湿度65%的环境中,放置30天,确保温度波动范围在±2℃,湿度波动范围在±5%。
老化处理后对导热系数进行测试,对比老化前后导热系数变化,结果如表2所示:
表2
实验组 | 老化前导热系数w/m.k | 老化后导热系数w/m.k |
实施例5 | 0.010 | 0.010 |
对比例4 | 0.010 | 0.012 |
从实验结果可以看出,含有吸气包的实施例5试样较对比例4试样具有更好的抗老化能力、更长的使用寿命。
Claims (10)
1.一种气凝胶改性聚氨酯泡沫隔热板,其特征在于:包括聚氨酯泡沫芯和至少一个隔热包,所述隔热包设置于聚氨酯泡沫芯内部,聚氨酯泡沫包裹着隔热包,隔热包在所述隔热板中的体积比为10%-90%,优选30-70%;
隔热包包括由具有阻气作用的阻隔薄膜围成的外壳体,所述外壳体内填充有隔热材料和至少一个吸气包,所述隔热材料包括1-60wt%气凝胶和40-99wt%无机纤维,优选15-60wt%气凝胶和40-85wt%无机纤维,或者25-60wt%气凝胶和40-75wt%无机纤维;
所述吸气包内填充有金属氧化物,所述金属氧化物包括氧化钙,吸气包的设置量根据隔热包的面积确定,控制吸气包≤5g/m2;
所述隔热包的导热系数为0.001-0.010w/m.k。
2.如权利要求1所述的气凝胶改性聚氨酯泡沫隔热板,其特征在于:
所述阻隔薄膜为铝箔复合膜,优选玻纤布/AL/PET/CPE复合膜或者玻纤布/AL/PET/NY/CPE复合膜;
所述吸气包的外包体材质为具有防水透气性能的材料,优选高密度聚乙烯材料,优选Tyvek杜邦纸;金属氧化物填充在外包体内;
所述金属氧化物还包括铜氧化物、铈氧化物;金属氧化物中氧化钙的质量百分比为98-99.5%,余量为铜氧化物和/或铈氧化物,铜氧化物、铈氧化物以任意比例混合。
3.如权利要求1所述的气凝胶改性聚氨酯泡沫隔热板,其特征在于:
所述气凝胶、无机纤维和吸气包密封在隔热包的外壳体中,且外壳体内抽真空密封以提高隔热效果;
优选所述聚氨酯泡沫芯外复合有装饰面,优选所述装饰面为膜、涂布纸、无纺布、铝膜压饰面或不锈钢框体。
4.如权利要求1所述的气凝胶改性聚氨酯泡沫隔热板,其特征在于:
所述气凝胶选自有机气凝胶、聚酰亚胺气凝胶或聚氨酯气凝胶,优选二氧化硅气凝胶;
所述无机纤维选自玻璃纤维、玄武岩纤维和陶瓷纤维中的一种或多种混合;
优选聚氨酯泡沫芯含有阻燃剂。
5.如权利要求1所述的气凝胶改性聚氨酯泡沫隔热板,其特征在于:
所述隔热材料还包括黑色材料,所述黑色材料为炭黑、氧化铁、五氧化三钛中的一种或多种混合物;
黑色材料的比表面积为10-360m2/g,优选70-150m2/g;
黑色材料在隔热材料中的质量比为0%-10%,优选2-8%或3-5%;
黑色材料的平均粒度≤10um。
6.如权利要求1所述的气凝胶改性聚氨酯泡沫隔热板,其特征在于:所述隔热材料还包括其它材料,所述其它材料选自膨胀珍珠岩、沉淀二氧化硅、碳酸钙、滑石粉或氢氧化镁;
所述隔热包或吸气包为长方体形、立方体形、球形或圆柱体形。
7.如权利要求1所述的气凝胶改性聚氨酯泡沫隔热板,其特征在于:所述隔热板的厚度为0.6cm-10cm,隔热包厚度为0.49-0.98cm,导热系数≤0.015w/m.k,火焰蔓延指数≤30,烟雾指数≤300。
8.权利要求1至7任一项所述的气凝胶改性聚氨酯泡沫隔热板的制备方法,其特征在于,包括如下步骤:
1)制备隔热包:将隔热材料和吸气包密封在阻隔薄膜内制得隔热包;
2)将隔热包放置在隔热板制备模具中;
3)将聚氨酯液体泡沫倾倒进隔热板制备模具中,且确保隔热包完全被泡沫材料包裹;
4)让泡沫材料硬化定型形成最终产品。
9.如权利要求8所述的制备方法,其特征在于:所述聚氨酯液体泡沫中含有阻燃剂,所述阻燃剂为卤素阻燃剂或非卤素阻燃剂,优选磷酸三酯,羟乙基膦酸二乙酯,磷酸三乙酯、氢氧化铝,氢氧化镁或氧化钼。
10.如权利要求8所述的制备方法,其特征在于:还包括步骤5)对隔热板进行装饰,所述装饰包括在表面涂颜色、在表面复合装饰面,优选所述装饰面为膜、涂布纸、无纺布、铝膜压饰面或不锈钢框体。
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