CN114133648B - 一种反射型漫散射温室棚膜及其制备方法 - Google Patents
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Abstract
本发明公开了一种反射型漫散射温室棚膜及其制备方法,属于农膜生产技术领域,其包括依次设置的外层、中间层和内层,其中,中间层包括低密度聚乙烯(LDPE)、茂金属线性低密度聚乙烯(mLLDPE)、光稳定剂、抗氧剂、紫外线吸收剂、银色母料,银色母料包括聚乙烯、铝粉、云母粉。本发明提供的反射型漫散射温室棚膜及其制备方法,在中间层中添加一定配比的铝粉、云母粉,使农膜内部产生银色斑点对光线进行反射和散射,既能降低光线透过率,还能使透过的光线散射,农膜通过反射光线而不是吸收光线来降低光线透过率,能够显著延长农膜使用寿命,同时能够起到降温的作用。
Description
技术领域
本发明涉及一种反射型漫散射温室棚膜及其制备方法,属于农膜生产技术领域。
背景技术
农膜覆盖形成的温室大棚能够在四季为作物生长提供适宜的温度、湿度、光照等环境,因而温室大棚在农业种植和园艺设施覆盖中被广泛使用。漫散射农膜是在农膜原料中添加功能性填料后,使光线透过农膜时发生散射,光线到达棚内后分布更均匀,能够照射到更多的作物叶片,增强作物的光合作用,增加对光的利用率,促进作物的生长。而且,漫射光比例的增加还能消掉正午温度的峰值,避免叶面被灼伤。
目前,农膜实现漫散射效果的机理主要有三种类型,第一种是使农膜表面形成磨砂表面,但这样对农膜透光率的影响很大,而且磨砂表面需对现有工艺进行较大的改动,不适于推广应用;第二种是在基材中添加有机散射剂,有机散射剂以细微的透明玻璃球体均匀分散在基材中,与基材的折射率不同,能够使光线发生折射,改变光的行进路线,达到匀光、透光目的;第三种是在基材中添加无机散射剂,使光线照射到无机散射剂颗粒后形成多角度折射,形成多点散射。
在实际应用时,需要根据当地的气候条件、种植作物的习性对漫散射光照强度进行控制,既要考虑增温透光效果,又要考虑降温遮阳效果。例如,针对光照较强的南方,可以使用不同散射程度的漫散射长寿膜或漫散射长寿流滴膜,例如60%散射度、70%散射度等。但针对光照很强的地区或需要更低光照强度的作物,普通漫散射产品因散射程度不够,或者透光率太高将不能够适用。因此有必要开发一款能够适用于高光照强度或者低光照作物需求的棚膜。
需要说明的是,上述内容属于发明人的技术认知范畴,并不必然构成现有技术。
发明内容
本发明的目的在于解决现有技术所存在的问题,提供了一种反射型漫散射温室棚膜及其制备方法,既能降低光线透过率,还能使透过的光线散射,方便通过调节铝粉、云母粉粒径大小和添加量达到不同光线透过率和不同散射度的要求。
本发明通过采取以下技术方案实现上述目的:
一种反射型漫散射温室棚膜,包括三层共挤形成一体的外层、中间层和内层,其中,
外层包括以下重量百分比的原料制成:茂金属线性低密度聚乙烯(mLLDPE)90.8%-93%、光稳定剂6%-8%、抗氧剂0.1%-0.3%、紫外线吸收剂0.1%-0.3%,抗静电剂0.4%-0.8%;
中间层包括以下重量百分比的原料制成:低密度聚乙烯(LDPE)30%-50%、茂金属线性低密度聚乙烯(mLLDPE)29.4%-55.8%、光稳定剂6%-8%、抗氧剂0.1%-0.3%、紫外线吸收剂0.1%-0.3%、银色母料8%-12%,所述银色母料包括以下重量百分比的原料制成:聚乙烯38%-73%、铝粉10%-20%、云母粉15%-50%,其中,铝粉和云母粉的细度为20-100μm;
内层包括以下重量百分比的原料制成:茂金属线性低密度聚乙烯(mLLDPE)91.4%-93.8%、光稳定剂6%-8%、抗氧剂0.1%-0.3%、紫外线吸收剂0.1%-0.3%。
可选的,所述茂金属线性低密度聚乙烯(mLLDPE)的牌号为2010、XP 6056、XP6026、1520、2645G中的任意一种。
可选的,所述低密度聚乙烯(LDPE)的牌号为2420D、150E中的任意一种。
可选的,所述光稳定剂的牌号为611、511、625、T68、XT-100中的任意一种。
可选的,所述抗氧剂的牌号为225、AT-215中的任意一种。
可选的,所述紫外线吸收剂的牌号为326、UV531、327、1577、3638中的任意一种。
本发明提供的反射型漫散射温室棚膜的制备方法,包括如下步骤:
(S1)配料:称量外层、中间层和内层的原料后,分别对应投入挤出吹塑机的三个料斗内;
(S2)加热塑化:控制分别与三个料斗连接的三个料筒的温度,使料斗内的原料混合熔融,分别得到熔融混合物,其中对应外层、中间层和内层原料的料筒温度分别为150-185℃、175-190℃、150-185℃;
(S3)挤出吹塑:将三个料斗内的熔融混合物按照一定的挤出速度同时挤出到模头上,在风环的作用下按照1.5-2.5吹胀比吹出相应直径的膜泡,室温下膜泡在牵引机的牵引下经过稳泡架和人字架逐渐成为片状薄膜,即得所述温室棚膜,其中挤出转速为30-60r/min,牵引速度为17-19m/min。
本申请的有益效果包括但不限于:
本发明提供的反射型漫散射温室棚膜及其制备方法,(1)在中间层中添加一定配比的铝粉、云母粉,使农膜内部产生银色斑点对光线进行反射和散射,既能降低光线透过率,还能使透过的光线散射;(2)能够避免农膜发白,避免完全散射,在降低透光率的同时,能够保证一部分的直射光;(3)应用时通过调节铝粉、云母粉粒径大小和添加量能够达到不同光线透过率和不同散射度的要求;(4)农膜通过反射光线而不是吸收光线来降低光线透过率,能够显著延长农膜使用寿命,同时能够起到降温的作用,对于控制温室内的温度具有重要的意义;(5)铝粉、云母粉的添加量少,仅需添加5‰左右,成本很低,对于农膜机械性能几乎没有影响。
具体实施方式
在以下内容中将会对本发明进行进一步的详细描述。但是需要指出的是,以下的具体实施方式仅仅以示例性的方式给出本发明的具体操作实例,但是本发明的保护范围不仅限于此。本发明的保护范围仅仅由权利要求书所限定。本领域技术人员能够显而易见地想到,可以在本发明权利要求书限定的保护范围之内对本发明所述的实施方式进行各种其它的改良和替换,并且仍然能够实现相同的技术效果,达到本发明的最终技术目的。
在本发明中,所有的比例均为重量比,所有的百分数均为重量百分数,温度的单位为℃,压力的单位为帕。室温指实验室内常规的环境温度,随季节和位置变化,通常为25℃。另外,本发明描述的所有数值范围均包括端值并且可以包括将公开的范围的上限和下限互相任意组合得到的新的数值范围。
以下将通过具体实施例对本发明提供的反射型漫散射温室棚膜及其制备方法进行详细说明。
如无特殊说明,本说明书中各原料通过商业途径购得,具体购买厂家说明如下。
茂金属线性低密度聚乙烯(mLLDPE):埃克森美孚化工2010、埃克森美孚化工XP6056、埃克森美孚化工XP 6026、三井化学SP1520、陶氏化学2645G;
低密度聚乙烯(LDPE):中海壳牌2420D、陶氏化学150E;
光稳定剂:宿迁联盛611、中国台湾双键511、天罡助剂625、天罡助剂T-68、巴斯夫XT-100;
抗氧剂:巴斯夫225、圣莱科特AT-215;
紫外线吸收剂:天罡助剂UV326、宿迁联盛UV531、天津立安隆UV327、宿迁联盛UV1577、天罡助剂UV3638。
实施例1:
本实施例提供的反射型漫散射温室棚膜,所用原料为:
实施例2:
本实施例提供的反射型漫散射温室棚膜,所用原料为:
实施例3:
本实施例提供的反射型漫散射温室棚膜,所用原料为:
实施例4:
本实施例提供的反射型漫散射温室棚膜,所用原料为:
实施例1-4中棚膜生产参数如下表:
对比例1:
本对比例中棚膜的原料为:
对比例2:
本对比例中棚膜的原料为:
对比例3:
本对比例中棚膜的原料为:
对比例4:
本对比例中棚膜的原料为:
对比例1-4中提供的棚膜制备方法同实施例,实施例1-4以及对比例1-4制备的棚膜厚度均为0.15mm。
对本发明实施例1-4以及对比例1-4制备的棚膜进行检测,表1中数据均为多次试验所取平均值。
表1实施例及对比例制备的棚膜检测结果
由表1中数据可知,本发明实施例1-3提供的棚膜中,拉伸强度满足要求,光线透过率和散射度适当,棚膜呈白色透明状。本发明提供的棚膜中,内层主要原料为茂金属线性低密度聚乙烯(mLLDPE),为薄膜提供拉伸强度和韧性,外层主要原料为茂金属线性低密度聚乙烯(mLLDPE),主要作用是提供拉力和韧性,并且添加了抗静电剂,能够达到持久防尘的效果。铝粉和云母粉添加在中间层避免流失或者失去光泽。
上述具体实施方式不能作为对本发明保护范围的限制,对于本技术领域的技术人员来说,对本发明实施方式所做出的任何替代改进或变换均落在本发明的保护范围内。
本发明未详述之处,均为本技术领域技术人员的公知技术。
Claims (2)
1.一种反射型漫散射温室棚膜,其特征在于,由三层共挤形成一体的外层、中间层和内层构成,其中,
外层由以下重量百分比的原料制成:茂金属线性低密度聚乙烯(mLLDPE)90.8%-93%、光稳定剂6%-8%、抗氧剂0.1%-0.3%、紫外线吸收剂0.1%-0.3%,抗静电剂0.4%-0.8%;
中间层由以下重量百分比的原料制成:低密度聚乙烯(LDPE)30%-50%、茂金属线性低密度聚乙烯(mLLDPE)29.4%-55.8%、光稳定剂6%-8%、抗氧剂0.1%-0.3%、紫外线吸收剂0.1%-0.3%、银色母料8%-12%,所述银色母料包括以下重量百分比的原料制成:聚乙烯38%-73%、铝粉10%-20%、云母粉15%-50%,其中,铝粉和云母粉的细度为20-100μm;
内层由以下重量百分比的原料制成:茂金属线性低密度聚乙烯(mLLDPE)91.4%-93.8%、光稳定剂6%-8%、抗氧剂0.1%-0.3%、紫外线吸收剂0.1%-0.3%;
所述茂金属线性低密度聚乙烯(mLLDPE)的牌号为2010、XP 6056、XP 6026、1520、2645G中的任意一种;
所述低密度聚乙烯(LDPE)的牌号为2420D、150E中的任意一种;
所述光稳定剂的牌号为611、511、625、T68、XT-100中的任意一种;
所述抗氧剂的牌号为225、AT-215中的任意一种;
所述紫外线吸收剂的牌号为326、UV531、327、1577、3638中的任意一种。
2.根据权利要求1所述的反射型漫散射温室棚膜的制备方法,其特征在于,包括如下步骤:
(S1)配料:称量外层、中间层和内层的原料后,分别对应投入挤出吹塑机的三个料斗内;
(S2)加热塑化:控制分别与三个料斗连接的三个料筒的温度,使料斗内的原料混合熔融,分别得到熔融混合物,其中对应外层、中间层和内层原料的料筒温度分别为150-185℃、175-190℃、150-185℃;
(S3)挤出吹塑:将三个料斗内的熔融混合物按照一定的挤出速度同时挤出到模头上,在风环的作用下按照1.5-2.5吹胀比吹出相应直径的膜泡,室温下膜泡在牵引机的牵引下经过稳泡架和人字架逐渐成为片状薄膜,即得所述温室棚膜,其中挤出转速为30-60r/min,牵引速度为17-19m/min。
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