CN109263216A - 一种自适应温度调节的散射节能膜 - Google Patents
一种自适应温度调节的散射节能膜 Download PDFInfo
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Abstract
本发明公开了一种自适应温度调节的散射节能膜,包括至少五层共挤复合膜,按照面朝棚外依次到棚内分为A、B、C、D、E五层结构;本发明提供的一种自适应温度调节的散射节能膜,产品效果替代传统温室大棚依靠白天外遮阳网降温,夜间需要薄膜保温的组合方法来保持温室内种植环境,通过对稀土元素及多种矿物质的复合运用使得薄膜具备光转换和热转换的可逆性主动调节棚内温度的属性,来反向对温室大棚内环境主动升温或者降温,使大棚内达到最佳节能和作物生长效果。
Description
技术领域
本发明涉及属于农用薄膜制备技术领域,进一步说,尤其涉及一种自适应温度调节的散射节能膜。
背景技术
目前我国功能性农膜是上世纪70年代末在普通棚膜的基础上发展起来的。由于近年环境气候越来越严酷,为了满足作物的反季节生长,大家普遍在传统的塑料薄膜大棚使用。传统的薄膜大多是采用普通低密度聚乙烯材料制成的耐老化膜,添加散射剂降温,或者添加保温剂保温。但是由于这两个功能的达成本身就是对立效果,普通散射降温膜在夏季可能满足短期需求,但是到了冬春季,降温效果反而成为了副作用。同理,普通添加保温剂的保温膜只能在春冬季寒冷时有效,到了夏季反而成为了副作用。
目前针对温室的操作,炎热夏季白天,使用遮阳网覆盖在棚外降温或者棚内添加降温风机设备,而在春季或严寒的夜间需要高保温薄膜保温,或者棚内加热。这个过程需要人工上下遮阳网及操作设备来维护,造成操作复杂和成本增加。
本发明提供的自适应温度调节的散射节能膜,能够起到主动式调节棚内环境的作用。借助稀土元素和不同保温材料配合效果,在紫外、可见光和红外段进行定制波长的能量转换,主动起到冬暖夏凉稳定棚内环境,提高光合作用效率。
发明内容
本发明为解决上述技术问题而采用的技术方案是提供一种共挤复合薄膜及制程,用于替代传统温室高温时遮阳网降温和低温时薄膜保温的组合功能,其中,具体技术方案为:
包括至少五层共挤复合膜,按照面朝棚外依次到棚内分为A、B、C、D、E五层结构;
A层为直接接触大棚外空气层,低密度茂金属聚乙烯MLLDPE为基材,添加抗静电剂2%wt,光稳定剂(受阻胺)6-8%wt;
B层为能量转换层,低密度茂金属聚乙烯MLLDPE为基材,添加光稳定剂(受阻胺)6-8%wt,添加为荧光染料和稀土铕单基转光剂,添加量0.3%wt;
C层为散射阻隔和初级近红外反射层,中密度聚乙烯MDPE为基材,添加光散射剂2-5%wt和光稳定剂(受阻胺)6-8%wt;添加Tio2类近红外散射母料6-8%wt.
D层为次级近红外反射层,本层采用EVA树脂加光稳定剂(受阻胺)6-8%wt,包含SiO2类近红外反射母料3-5%wt,同时添加防流滴剂10%wt作为E层的储备层;
E层为防流滴消雾层和远红外反射层,EVA和LDPE树脂混合载体,添加防流滴剂10%wt和防雾剂0.5%wt,添加远红外反射母料6-8%wt。
上述的自适应温度调节的散射节能膜,其中:E层外还包括F层,F层为涂敷层,是长效防流滴和消雾涂层。
上述的自适应温度调节的散射节能膜,其中:A、B、C、D、E、F层比为1:1:1:1:1:1。
上述的自适应温度调节的散射节能膜,其中:B层吹膜加工时保持低温,螺筒温度不高于180度。
上述的自适应温度调节的散射节能膜,其中:C层光散射剂为Caco3或者硅酸盐类,平均粒径必须选择在2um。
上述的自适应温度调节的散射节能膜,其中:C层近红外反射助剂选择Tio2、云母和铁铬氧化物中一种或数种,平均粒径0.5um,反射区域780-1500um,D层近红外反射助剂选择Sio2、云母和铁铬氧化物中一种或数种,平均粒径1um,反射区域780-1500um,双层叠加近红外反射效率40%,远红外反射母料添加8-10%,选用硅酸盐、滑石粉、云母片一种或数种。
本发明相对于现有技术具有如下有益效果:
1)薄膜需要至少5层(或者7层)共挤工艺生产,可以配套表面涂敷工艺,实现多层共挤复合工艺的制造方案的创新;
2)产品效果替代传统温室大棚依靠白天外遮阳网降温,夜间需要薄膜保温的组合方法来保持温室内种植环境;白天主要是阳光近红外导致的发热,而夜间是土壤吸收的热能以远红外发射导致棚内散热。
3)通过对稀土元素及多种矿物质的复合运用使得薄膜具备光转换和热转换的可逆性主动调节棚内温度的属性。
4)特定叠加红外反射层,外隔热和内保温效果最大化,来反向对温室大棚内环境主动升温或者降温,使大棚内达到最佳节能和作物生长效果。
具体实施方式
本发明提供了一种自适应温度调节的散射节能膜及其制作方法。
本发明的自适应温度调节的散射节能膜,一次性解决了跨季节种植遇到的季节转换对棚内温度和光照的反向需求,提供了棚内节能效果,提高了光合作用。
传统夏季遮阳网虽然降温,但是严重降低了可见光透过率(45-60%),使得作物长期处于弱光状态,影响光合作用。本发明的自适应温度调节的散射节能膜特定的层结构配置,最大限度的提高可见光透过率(不低于80%)和散射度(50-60%),散射光属于优质光源,能够提升光合作用效率。通过主动提升光质,吸收紫外光转换成红光/近红外光发射峰,并且能够控制近红外线和远红外反射率达到主动调节棚内温度,以达到提高光合作用效率和延长光合效率饱和点的效果。
为实现上述技术效果:
五层(及以上)共挤复合膜,按照面朝棚外依次到棚内分为A、B、C、D、E五层结构,层比为1;1:1:1:1。
A层为直接接触大棚外空气层,低密度茂金属聚乙烯MLLDPE为基材,添加抗静电剂2%wt,光稳定剂(受阻胺)6-8%wt,确保紫外光在本层的高透过率,紫外光需要用于中间层的能量转换效果。抗静电防尘以提高长期的光转换效率,提高薄膜的机械强度和耐候性。
B层为能量转换层,低密度茂金属聚乙烯MLLDPE为基材,添加光稳定剂(受阻胺)6-8%wt,添加为荧光染料和稀土铕单基转光剂,添加量0.3%wt。经过日光的照射后,吸收紫外线(280-350nm)能量激发形成(600-670nm)红光发射峰。使红光区光强增加约15%。红光可以起到促进植物光合作用效率和提升棚温效果。吹膜加工时保持低温,螺筒温度不高于180度。
C层为散射阻隔层和初级近红外反射层,中密度聚乙烯MDPE为基材,添加光散射剂2-5%wt和光稳定剂(受阻胺)6-8%wt,光散射剂(Caco3或者硅酸盐类)的平均粒径必须选择在2um。MDPE的阻隔层可以减少D、E层的小分子类的助剂,如防流滴剂在层间的迁移可能对能量转换层稀土元素造成的迁移流失,极大提高了能量转化层的使用寿命。添加Tio2类,云母和铁铬氧化物中一种或数种,初级近红外散射母料6-8%wt,粒径0.5um。
D层为次级红外反射层,本层采用EVA树脂加光稳定剂(受阻胺)6-8%wt,具备良好的近红外阻隔效果,强化冬季及夜间保温。包含近红外反射母料3-5%wt,同时添加防流滴剂10%wt作为E层的储备层。近红外反射助剂可以选择Sio2、云母和铁铬氧化物等红外反射剂等,平均粒径1um.反射区域780-1500um,配合C层叠加近红外反射效率40%。由于夏天白天棚内高温主要是近红外光能量,近红外反射率40%可以有效降低棚温。
E层为防流滴消雾层和远红外反射层,EVA和LDPE树脂混合载体,添加防流滴剂10%wt和防雾剂0.5%wt,目的是在棚内形成良好的水膜和湿度控制,提升了光线,温度等能量利用的效率。远红外反射母料添加8-10%,可选用硅酸盐、滑石粉、云母片等。反射区域2500-4000um。远红外透过率低于20%。夜间时,棚内土地释放的远红外线也可以被大部分阻隔在棚内,同时B层的能量转换层提供的额外红光能量也可以阳光减弱时提升棚内温度,并且额外的红光能量和白天的强日光相比占比非常小,不会对降温效果造成影响。
以上各层的混合配置充分考虑了每层对不同波长光谱的利用,以其得到高可见光透过率80%以上和高散射度60%左右作物最佳光环境。目的是在棚内形成良好的长效的水膜和湿度控制,进一步提升了光线,温度等能量利用的效率。
本发明提供的自适应温度调节的散射节能膜在使用中,特别是在高端温室内需要配套多层外遮阳及降温体系和内保温及加热体系的结构中,可以明显降低降温以及保温所需的大量能耗。同时在热带地区简易大棚的使用中,无需使用额外措施即可达到明显调温及提高光合作用效果,减少散户农民的种植风险。
本发明提供的自适应温度调节的散射节能膜在使用中,在夏季代替外遮阳网加内保温膜的情况下,保持80%以上高透光度。而传统遮阳网的遮光率在40-70%。按照光合作用原理来说,在光合作用未饱和情况下(温度和光强),每增加1%的光照就能对应1%的增产。除了节约遮阳网的额外费用外,在不添加降温设备的情况下,对于热带地区夏季种植作物产量能够产生巨大的提升30-50%不等。
而在春冬季,主动增加红光可提升棚温,优秀的远红外阻隔也能保温,使得本发明不低于传统透明保温膜的功效。一次使用也简化了农业管理流程,达到良好的节能效果。
另外,现有技术中,类似的降温或者高保温薄膜,只能同时具备一种功能。如普通降温薄膜通过添加金红石钛白粉或者铝粉等对红外光进行反射降温,存在的弊端是极大影响了透光度,该类薄膜仅适合于透光要求不高的环境或者地膜覆盖。而且降温薄膜在冬季种植就不适合,无法适应跨季节种植要求。而普通高保温薄膜一般需要高透明度,无法满足夏季种植的降温效果。
虽然本发明已以较佳实施例揭示如上,然其并非用以限定本发明,任何本领域技术人员,在不脱离本发明的精神和范围内,当可作些许的修改和完善,因此本发明的保护范围当以权利要求书所界定的为准。
Claims (7)
1.一种自适应温度调节的散射节能膜,其特征在于:包括至少五层共挤复合膜,按照面朝棚外依次到棚内分为A、B、C、D、E五层结构;
A层为直接接触大棚外空气层,低密度茂金属聚乙烯MLLDPE为基材,添加抗静电剂2%wt,光稳定剂(受阻胺)6-8%wt;
B层为能量转换层,低密度茂金属聚乙烯MLLDPE为基材,添加光稳定剂(受阻胺)6-8%wt,添加为荧光染料和稀土铕单基转光剂,添加量0.3%wt;
C层为散射阻隔层和初级近红外反射层,中密度聚乙烯MDPE为基材,添加光散射剂2-5%wt和光稳定剂(受阻胺)6-8%wt;初级近红外散射母料6-8%wt,粒径0.5um;
D层为次级近红外反射层,本层采用EVA树脂加光稳定剂(受阻胺)6-8%wt,包含次级近红外反射母料3-5%wt,同时添加防流滴剂10%wt作为E层的储备层;次级红外反射助剂,平均粒径1um.反射区域780-1500um,配合C层叠加近红外反射效率40%;
E层为防流滴消雾层和远红外反射层,EVA和LDPE树脂混合载体,添加防流滴剂10%wt和防雾剂0.5%wt,和远红外反射母料的添加6-8%wt,反射区域2500-4000um。远红外透过率低于20%。
2.如权利要求1所述的自适应温度调节的散射节能膜,其特征在于:E层外还包括F层,F层为涂敷层,是长效防流滴和消雾涂层。
3.如权利要求2所述的自适应温度调节的散射节能膜,其特征在于:
A、B、C、D、E、F层比为1:1:1:1:1:1。
4.如权利要求3所述的自适应温度调节的散射节能膜,其特征在于:B层吹膜加工时保持低温,螺筒温度不高于180度。
5.如权利要求4所述的自适应温度调节的散射节能膜,其特征在于:C层光散射剂为Caco3或者硅酸盐类,平均粒径必须选择在2um。初级红外反射助剂选择Tio2、云母和铁铬氧化物中一种或数种,平均粒径0.5um。
6.如权利要求5所述的自适应温度调节的散射节能膜,其特征在于:D层次级近反射区域780-1500um,选用Sio2、云母和铁铬氧化物等红外反射剂等,平均粒径1um.配合C层叠加近红外反射效率40%。
7.如权利要求6所述的自适应温度调节的散射节能膜,其特征在于:E层为防流滴消雾层和远红外反射层,远红外反射母料添加8-10%,选用硅酸盐、滑石粉、云母片一种或数种。
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