CN106042516A - 一种含气凝胶的反射型绝热材料及其制备方法 - Google Patents
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Abstract
本发明公开了一种含气凝胶的反射型绝热材料,包括多孔材料、气凝胶和铝箔贴面;所述气凝胶设在多孔材料和铝箔贴面之间;本发明综合利用了多孔绝热原理和反射绝热原理,保温性能优异;实现了有机保温材料和无机保温材料的结合,充分铝箔高反射率的特点,能有效降低热辐射,大大提升了材料的保温性能、抗氧化性能、耐高温性能等。
Description
技术领域
本发明涉及一种新型保温绝热材料,特别涉及一种含气凝胶的反射型绝热材料及其制备方法,可用于建筑、工业、交通运输等多领域的保温节能材料。
背景技术
随着经济的发展,全球对能源的需求日益增大,在不断增大的总能耗中,建筑能耗约占总能耗的11%~ 25%,因此,建筑节能问题引起了越来越多的国家的重视。实践证明,建筑节能最直接有效的方法是使用保温绝热材料;目前常用的绝热材料主要有:泡沫玻璃、聚苯乙烯泡沫塑料、胶粉聚苯颗粒保温材料、保温砂浆、加气混凝土、泡沫石棉、复合硅酸盐保温材料等,但这些保温材料普遍存在热导率较高的问题,其保温性能还有待进一步提高。
气凝胶是一种结构可控的新型低密度、高孔隙率纳米多孔材料,具有连续的网络结构,孔洞尺寸和颗粒直径范围均为纳米量级,气凝胶在力学、声学、热学、光学等方面所呈现出的独特性质,如极低的固态和气态热导率、低折射率,低弹性模量、低声阻抗、强吸附性能等,使其在航空航天、化工、节能建筑、军事、通讯、电子、冶金等应用领域有着十分广阔的前景。
绝热材料按绝热原理可分为:多孔材料、反射材料和真空材料三类;前者利用材料本身所含的孔隙绝热,因为孔隙内的空气或惰性气体的导热系数很低,如泡沫材料、纤维材料等;热反射材料具有很高的反射系数,能将热量反射出去,如金、银、镍、铝箔或镀金属的聚酯、聚酰亚胺薄膜等;真空绝热材料是利用材料的内部真空达到阻隔对流来绝热;我们可以发现,其中多孔材料已经被广泛应用在保温工程上,然而反射材料在工程实践中的应用却很少。
自然界中热量的传递有热传导,热对流和热辐射三种基本方式,建筑外墙也不例外;在有封闭空气间层时,三种传热方式中传热量最大的是热辐射,约占传热总量的70%,其次为对流约占20%,热传导最小仅仅占10%。我们没有理由把外保温技术的设计思路局限在阻止热传导这样一个狭窄的领域里。应该针对传热量最大的热辐射这个主要矛盾来考虑和解决问题。
基于目前绝热材料的现状及问题,以及气凝胶优越的性能,本发明设计了一种含气凝胶,且带反射层的新型保温材料,综合利用了多孔绝热原理、反射绝热原理以及气凝胶的性能优势,提出了一种保温性能更优,生产成本低廉的新型保温材料。
发明内容
针对上述存在的技术问题,本发明的目的是:提供一种含气凝胶的反射型绝热材料及其制备方法,综合利用了多孔绝热原理、反射绝热原理以及气凝胶的性能优势,该材料保温性能优异,生产成本低廉。
本发明的技术解决方案是这样实现的:一种含气凝胶的反射型绝热材料,包括多孔材料、气凝胶和铝箔贴面;所述气凝胶设在在多孔材料和铝箔贴面之间。
优选的,所述多孔材料为聚氨酯泡沫、聚乙烯气泡、聚苯乙烯泡沫、玻璃棉、岩棉中的一种或几种材料的混合体。
优选的,所述气凝胶为SiO2气凝胶、有机气凝胶中的一种或两种材料混合体,气凝胶呈窄孔径分布,孔径为5~20nm,孔隙率为90~98%。
优选的,所述铝箔贴面经热压法与多孔材料复合,铝箔将多孔材料完全包覆,表面反射率为95%~99%。
优选的,一种含气凝胶的反射型绝热材料的制备方法,包括下述顺序的步骤:
(1)用溶胶-凝胶法制备气凝胶预聚体,并向其中添加干燥控制化学添加剂;
(2)将多孔材料浸渍于气凝胶预聚体中,1~2h后取出置于隔板上,至不再有浆体流出;
(3)将浸渍后的多孔材料置于烘箱中进行凝胶老化,温度为50~80℃,时间为100~150h;
(4)老化后,将温度升至100~160℃,恒温干燥24~48h;
(5)用铝箔对干燥后的多孔材料进行全面热压贴面,热压温度为60~80℃。
优选的,所述干燥控制化学添加剂为甲酰胺或N,N-二甲基甲酰胺中的一种。
由于上述技术方案的运用,本发明与现有技术相比具有下列优点:
本发明的一种含气凝胶的反射型绝热材料及其制备方法,综合利用了多孔绝热原理和反射绝热原理,保温性能优异;实现了有机保温材料和无机保温材料的结合,充分铝箔高反射率的特点,能有效降低热辐射,大大提升了材料的保温性能、抗氧化性能、耐高温性能等。
具体实施方式
下面来说明本发明。
本发明所述的一种含气凝胶的反射型绝热材料,包括多孔材料、气凝胶和铝箔贴面;所述气凝胶设在在多孔材料和铝箔贴面之间;所述多孔材料为聚氨酯泡沫、聚乙烯气泡、聚苯乙烯泡沫、玻璃棉、岩棉中的一种或几种材料的混合体;所述气凝胶为SiO2气凝胶、有机气凝胶中的一种或两种材料混合体,气凝胶呈窄孔径分布,孔径为5~20nm,孔隙率为90~98%;所述铝箔贴面经热压法与多孔材料复合,铝箔将多孔材料完全包覆,表面反射率为95%~99%。
一种含气凝胶的反射型绝热材料的制备方法,包括下述顺序的步骤:
(1)用溶胶-凝胶法制备气凝胶预聚体,并向其中添加干燥控制化学添加剂;
(2)将多孔材料浸渍于气凝胶预聚体中,1~2h后取出置于隔板上,至不再有浆体流出;
(3)将浸渍后的多孔材料置于烘箱中进行凝胶老化,温度为50~80℃,时间为100~150h;
(4)老化后,将温度升至100~160℃,恒温干燥24~48h;
(5)用铝箔对干燥后的多孔材料进行全面热压贴面,热压温度为60~80℃。
所述干燥控制化学添加剂为甲酰胺或N,N-二甲基甲酰胺中的一种。
实施例1,一种含气凝胶的反射型绝热材料,包括多孔材料、气凝胶和铝箔贴面;所述气凝胶设在在多孔材料和铝箔贴面之间;其中,气凝胶呈窄孔径分布,平均孔径为5nm,孔隙率为90%;铝箔贴面经热压法与多孔材料复合,铝箔将多孔材料完全包覆,表面反射率为95%。
一种含气凝胶的反射型绝热材料的制备方法,其特征在于包括下述顺序的步骤:
(1)用溶胶-凝胶法制备气凝胶预聚体,并向其中添加干燥控制化学添加剂甲酰胺;
(2)将多孔材料浸渍于气凝胶预聚体中,1h后取出置于隔板上,至不再有浆体流出;
(3)将浸渍后的多孔材料置于烘箱中进行凝胶老化,温度为50℃,时间为100h;
(4)老化后,将温度升至100℃,恒温干燥24h;
(5)用铝箔对干燥后的多孔材料进行全面热压贴面,热压温度为60℃。
实施例2、一种含气凝胶的反射型绝热材料,包括多孔材料、气凝胶和铝箔贴面;所述气凝胶设在在多孔材料和铝箔贴面之间;其中,气凝胶呈窄孔径分布,平均孔径为15nm,孔隙率为94%;铝箔贴面经热压法与多孔材料复合,铝箔将多孔材料完全包覆,表面反射率为97%。
一种含气凝胶的反射型绝热材料的制备方法,其特征在于包括下述顺序的步骤:
(1)用溶胶-凝胶法制备气凝胶预聚体,并向其中添加干燥控制化学添加剂N,N-二甲基甲酰胺;
(2)将多孔材料浸渍于气凝胶预聚体中,1.5h后取出置于隔板上,至不再有浆体流出;
(3)将浸渍后的多孔材料置于烘箱中进行凝胶老化,温度为65℃,时间为125h;
(4)老化后,将温度升至130℃,恒温干燥36h;
(5)用铝箔对干燥后的多孔材料进行全面热压贴面,热压温度为70℃。
实施例3、一种含气凝胶的反射型绝热材料,包括多孔材料、气凝胶和铝箔贴面;所述气凝胶设在在多孔材料和铝箔贴面之间;其中,气凝胶呈窄孔径分布,平均孔径为20nm,孔隙率为98%;铝箔贴面经热压法与多孔材料复合,铝箔将多孔材料完全包覆,表面反射率为99%。
一种含气凝胶的反射型绝热材料的制备方法,其特征在于包括下述顺序的步骤:
(1)用溶胶-凝胶法制备气凝胶预聚体,并向其中添加干燥控制化学添加剂甲酰胺;
(2)将多孔材料浸渍于气凝胶预聚体中,2h后取出置于隔板上,至不再有浆体流出;
(3)将浸渍后的多孔材料置于烘箱中进行凝胶老化,温度为80℃,时间为150h;
(4)老化后,将温度升至160℃,恒温干燥48h;
(5)用铝箔对干燥后的多孔材料进行全面热压贴面,热压温度为80℃。
本发明的一种含气凝胶的反射型绝热材料及其制备方法,综合利用了多孔绝热原理和反射绝热原理,保温性能优异;实现了有机保温材料和无机保温材料的结合,充分铝箔高反射率的特点,能有效降低热辐射,大大提升了材料的保温性能、抗氧化性能、耐高温性能等。
上述实施例只为说明本发明的技术构思及特点,其目的在于让熟悉此项技术的人士能够了解本发明的内容并加以实施,并不能以此限制本发明的保护范围,凡根据本发明精神实质所作的等效变化或修饰,都应涵盖在本发明的保护范围内。
Claims (6)
1.一种含气凝胶的反射型绝热材料,其特征在于:包括多孔材料、气凝胶和铝箔贴面;所述气凝胶设在在多孔材料和铝箔贴面之间。
2.根据权利要求1所述的一种含气凝胶的反射型绝热材料,其特征在于:所述多孔材料为聚氨酯泡沫、聚乙烯气泡、聚苯乙烯泡沫、玻璃棉、岩棉中的一种或几种材料的混合体。
3.根据权利要求1所述的一种含气凝胶的反射型绝热材料,其特征在于:所述气凝胶为SiO2气凝胶、有机气凝胶中的一种或两种材料混合体,气凝胶呈窄孔径分布,孔径为5~20nm,孔隙率为90~98%。
4.根据权利要求1所述的一种含气凝胶的反射型绝热材料,其特征在于:所述铝箔贴面经热压法与多孔材料复合,铝箔将多孔材料完全包覆,表面反射率为95%~99%。
5.根据权利要求1所述的一种含气凝胶的反射型绝热材料的制备方法,其特征在于包括下述顺序的步骤:
(1)用溶胶-凝胶法制备气凝胶预聚体,并向其中添加干燥控制化学添加剂;
(2)将多孔材料浸渍于气凝胶预聚体中,1~2h后取出置于隔板上,至不再有浆体流出;
(3)将浸渍后的多孔材料置于烘箱中进行凝胶老化,温度为50~80℃,时间为100~150h;
(4)老化后,将温度升至100~160℃,恒温干燥24~48h;
(5)用铝箔对干燥后的多孔材料进行全面热压贴面,热压温度为60~80℃。
6.根据权利要求5所述的一种含气凝胶的反射型绝热材料的制备方法,其特征在于:所述干燥控制化学添加剂为甲酰胺或N,N-二甲基甲酰胺中的一种。
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