CN114539661A - 一种高透光漫散射农用膜及其制备方法 - Google Patents
一种高透光漫散射农用膜及其制备方法 Download PDFInfo
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Abstract
本发明属于农用薄膜制备技术领域,本发明公开了一种高透光漫散射农用膜及其制备方法。本发明的高透光漫散射农用薄膜,包含透明聚合物树脂基体和均匀分散的具有特殊形貌的有机无机杂化光散射助剂及其他助剂,在保证高透光率前提下,提供了高雾度,有效提高了漫散射强度,减少直射光,避免灼烧和棚内升温过高。制备的农膜强度高,柔韧性好,透光率可达到98.4%,雾度40~65之间。能够用于多种农作物栽培种植,普适性强,应用广泛。
Description
技术领域
本发明涉及农用薄膜制备技术领域,尤其涉及一种高透光漫散射农用膜及其制备方法。
背景技术
漫散射农用薄膜广泛用于华中和华东地区蔬菜、花卉和果树栽培和种植。其特点是将太阳光从直射光变成漫散射光,特别是在夏季高温时期,避免大棚内局部温度过高造成经济作物灼伤。同时具有早晚升温快,光线较为柔和,增大受光面积,达到增产增收的效果。发展高性价比的高透光漫散射农用膜除了带来农户经济上的增收外,还可降低农药的使用量,实现绿色环保的农业。
目前市面上的有色农用膜虽具有一定的漫散射作用,但散射作用时效较短,在外界环境影响下,如光照较长、高温、潮湿等会造成农用膜中有机物质分解,不仅会降低农用膜透光及散射作用,而且会释放出有毒物质。现有研究认为农用膜的漫散射可通过两种方式来实现,一种是原料使用双峰PE(聚乙烯),利用不同聚合物收缩率不同实现农膜表面粗糙,实现漫散射,但这种技术受限于原料,目前市面上只有双峰PE材料,只有少数公司生产且价格昂贵。另一种方法是添加漫散射助剂,如在聚合物薄膜中添加无机填料,通过无机填料对光线的折射和反射产生雾度,减少直射光,但无机填料与聚合物基体的相容性较差,在聚合物分散性不均匀,造成薄膜透光率降低,影响大棚内农作物对光线的吸收,不能体现出漫散射薄膜的优势。专利CN 110818988A报道了利用无机填料二氧化钛和PMMA制备漫散射薄膜最高雾度值为21%,其雾度较低,低雾度不能有效形成散射。专利CN 108570178A报道了利用传统的有机漫散射添加剂可以在较小的添加量下制备出漫散射薄膜,但其透光率较低,最高值为91.5%。
发明内容
有鉴于此,本发明提供了一种高透光漫散射农用膜及其制备方法,在有效漫散射基础上兼具高透光率,不仅可将直射光变柔和,解决农作物灼烧问题,同时增加受光面积,增大光合作用的速率。
为了达到上述目的,本发明采用如下技术方案:
本发明提供一种高透光漫散射农用膜,包含聚合物树脂基体和有机无机杂化光散射助剂,所述有机无机杂化光散射助剂的添加量为聚合物树脂基体的1~8wt%。
作为优选,所述聚合物树脂基体为低密度聚乙烯LDPE、线性低密度聚乙烯LLDPE、聚氯乙烯PVC、聚丙烯PP、乙烯-醋酸乙烯共聚物EVA和聚碳酸酯PC中的一种或多种。
作为优选,所述有机无机杂化光散射助剂为有机聚合物包覆剂修饰的无机粒子;所述有机聚合物包覆剂为聚甲基丙烯酸甲酯PMMA、聚二甲基有机硅氧烷PDMS、聚碳酸酯、聚苯乙烯、硅烷偶联剂和甲基丙烯酸氯化铬络合物中的一种或多种;所述无机粒子为二氧化硅、二氧化钛、氧化锌、氧化锡、高岭土、坡缕石、蛭石、碳酸镁、醋酸锌、氧化铝和氧化镁中的一种或多种。
作为优选,所述有机无机杂化光散射助剂的形貌为为花状、球状、片层状、海胆状、正立方体状和正四面体状中的一种或多种。
作为优选,所述有机无机杂化光散射助剂的粒径为1~10μm。
作为优选,所述有机无机杂化光散射助剂中有机聚合物包覆剂的添加量为1~10wt%。
作为优选,所述高透光漫散射农用膜还包括光稳定剂和抗氧化剂;所述光稳定剂为受阻酚类光稳定剂、邻羟基二苯甲酮类光稳定剂、苯并三唑类光稳定剂复配组成的复合光稳定剂或受阻酚类光稳定剂,光稳定剂的添加量为聚合物树脂基体的0.1~5wt%;所述抗氧化剂为抗氧化剂215,抗氧化剂的添加量为聚合物树脂基体的0.1~5wt%。
本发明还提供了所述高透光漫散射农用膜的制备方法,包括如下步骤:
(1)将部分聚合物树脂基体与有机无机杂化光散射助剂混合,静置脱泡,得混合料;
(2)将混合料通过螺杆挤出机,得母料;
(3)将母料与剩余聚合物树脂基体混合,挤出吹胀,得高透光漫散射农用膜。
作为优选,所述步骤(1)中,部分聚合物树脂基体的添加量为聚合物树脂基体的20%-50%。
作为优选,所述步骤(2)中,螺杆挤出机料筒温度为190~230℃,机头和口模处温度为230~260℃;所述步骤(3)中,挤出吹胀的温度为150~195℃。
经由上述的技术方案可知,与现有技术相比,本发明有益效果如下:
(1)本发明提供的高透光率漫散射农用薄膜内部添加了有机无机杂化光敏剂,在保证高透光率前提下,提供了高雾度,有效提高了漫散射强度,减少直射光,避免灼烧和棚内升温过高;
(2)制备的农膜强度高,柔韧性好,透光率达到98.4%,雾度50-65之间;
(3)能够用于多种聚烯烃薄膜(如PE、PVC、EVA膜),普适性强,应用广泛。
具体实施方式
本发明提供一种高透光漫散射农用膜,包含聚合物树脂基体和有机无机杂化光散射助剂,所述有机无机杂化光散射助剂的添加量为聚合物树脂基体的1~8wt%。
在本发明中,所述聚合物树脂基体优选为低密度聚乙烯LDPE、线性低密度聚乙烯LLDPE、聚氯乙烯PVC、聚丙烯PP、乙烯-醋酸乙烯共聚物EVA和聚碳酸酯PC中的一种或多种,进一步优选为低密度聚乙烯LDPE和/或线性低密度聚乙烯LLDPE。
在本发明中,所述有机无机杂化光散射助剂为有机聚合物包覆剂修饰的无机粒子;所述有机聚合物包覆剂优选为聚甲基丙烯酸甲酯PMMA、聚二甲基有机硅氧烷PDMS、聚碳酸酯、聚苯乙烯、硅烷偶联剂和甲基丙烯酸氯化铬络合物中的一种或多种,进一步优选为聚甲基丙烯酸甲酯PMMA、聚二甲基有机硅氧烷PDMS和聚碳酸酯中的一种或多种;所述无机粒子优选为二氧化硅、二氧化钛、氧化锌、氧化锡、高岭土、坡缕石、蛭石、碳酸镁、醋酸锌、氧化铝和氧化镁中的一种或多种,进一步优选为氧化锡、高岭土、坡缕石、蛭石和碳酸镁中的一种或多种。
在本发明中,所述有机无机杂化光散射助剂的形貌为花状、球状、片层状、海胆状、正立方体状和正四面体状中的一种或多种。
在本发明中,所述有机无机杂化光散射助剂的粒径优选为1~10μm,进一步优选为2~8μm。
在本发明中,所述有机无机杂化光散射助剂中有机聚合物包覆剂的添加量优选为1~10wt%,进一步优选为5~8wt%。
在本发明中,所述高透光漫散射农用膜还包括光稳定剂和抗氧化剂;所述光稳定剂优选为受阻酚类光稳定剂、邻羟基二苯甲酮类光稳定剂、苯并三唑类光稳定剂复配组成的复合光稳定剂或受阻酚类光稳定剂,进一步优选为受阻酚类光稳定剂、邻羟基二苯甲酮类光稳定剂、苯并三唑类光稳定剂复配组成的复合光稳定剂;光稳定剂的添加量优选为聚合物树脂基体的0.1~5wt%,进一步优选为聚合物树脂基体的0.3~2wt%;所述抗氧化剂为抗氧化剂215,抗氧化剂的添加量优选为聚合物树脂基体的0.1~5wt%,进一步优选为聚合物树脂基体的0.5~4wt%。
本发明还提供了所述高透光漫散射农用膜的制备方法,包括如下步骤:
(1)将部分聚合物树脂基体与有机无机杂化光散射助剂混合,静置脱泡,得混合料;
(2)将混合料通过螺杆挤出机,得母料;
(3)将母料与剩余聚合物树脂基体混合,挤出吹胀,得高透光漫散射农用膜。
在本发明中,所述步骤(1)中,部分聚合物树脂基体的添加量优选为聚合物树脂基体的20%-50%,进一步优选为聚合物树脂基体的30%-40%。
在本发明中,所述步骤(2)中,螺杆挤出机料筒温度优选为190~230℃,进一步优选为200~220℃;机头和口模处温度优选为230~260℃,进一步优选为240~250℃;所述步骤(3)中,挤出吹胀的温度优选为150~195℃,进一步优选为160~180℃。
下面结合实施例对本发明提供的技术方案进行详细的说明,但是不能把它们理解为对本发明保护范围的限定。
实施例1
高透光率漫散射农用薄膜的组分和各组分之间含量如下:
具体制作方法:先将2份有机无机杂化光散射助剂与10份低密度聚乙烯及1.5份光稳定剂和1.5份抗氧化剂215挤出制备母粒,螺杆挤出机温度料筒温度控制在220℃,机头和口模处温度控制在260℃,然后将母粒与剩余35份低密度聚乙烯和50份线性低密度聚乙烯混合均匀,在挤出机中,150℃下共挤出吹胀制备出农用薄膜。
实施例2
高透光率漫散射农用薄膜的组分和各组分之间含量如下:
具体制作方法:先将5份有机无机杂化光散射助剂与10份低密度聚乙烯及1.5份光稳定剂和1.5份抗氧化剂215挤出制备母粒,螺杆挤出机温度料筒温度控制在190℃,机头和口模处温度控制在240℃然后将母粒与剩余50份低密度聚乙烯和30份线性低密度聚乙烯混合均匀,在挤出机中,160℃下共挤出吹胀制备出农用薄膜。
实施例3
高透光率漫散射农用薄膜的组分和各组分之间含量如下:
具体制作方法:先将3份有机无机杂化光散射助剂与10份低密度聚乙烯及1.5份光稳定剂和1.5份抗氧化剂215挤出制备母粒,螺杆挤出机温度料筒温度控制在200℃,机头和口模处温度控制在250℃,然后将母粒与剩余85份低密度聚乙烯混合均匀,在挤出机中,在180℃下共挤出吹胀制备出农用薄膜。
实施例4
高透光率漫散射农用薄膜的组分和各组分之间含量如下:
具体制作方法:先将3份有机无机杂化光散射助剂与10份线性低密度聚乙烯及1.5份光稳定剂和1.5份抗氧化剂215挤出制备母粒,螺杆挤出机温度料筒温度控制在210℃,机头和口模处温度控制在240℃,然后将母粒与剩余85份线性低密度聚乙烯混合均匀,在挤出机中,在190℃下共挤出吹胀制备出农用薄膜。
实施例5
高透光率漫散射农用薄膜的组分和各组分之间含量如下:
具体制作方法:先将3份有机无机杂化光散射助剂与10份线性低密度聚乙烯及1.5份光稳定剂和1.5份抗氧化剂215挤出制备母粒,螺杆挤出机温度料筒温度控制在190℃,机头和口模处温度控制在260℃,然后将母粒与剩余40份低密度聚乙烯和聚氯乙烯混合均匀,在挤出机中,在160℃下共挤出吹胀制备出农用薄膜。
对实施例1~5及市售漫散射薄膜进行性能测试,结果如表1所示:
表1高透光漫散射农用薄膜的性能测试
由表1的实验结果可知,市售的漫散射薄膜透光率和雾度值较低,与此相对本发明制备的农膜透光率较高达98.4%,雾度可达55%。兼具高透光和高雾度特点,此外薄膜具有较高拉伸强度,在现有加工条件下就可实现。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (10)
1.一种高透光漫散射农用膜,其特征在于,包含聚合物树脂基体和有机无机杂化光散射助剂,所述有机无机杂化光散射助剂的添加量为聚合物树脂基体的1~8wt%。
2.根据权利要求1所述的高透光漫散射农用膜,其特征在于,所述聚合物树脂基体为低密度聚乙烯LDPE、线性低密度聚乙烯LLDPE、聚氯乙烯PVC、聚丙烯PP、乙烯-醋酸乙烯共聚物EVA和聚碳酸酯PC中的一种或多种。
3.根据权利要求2所述的高透光漫散射农用膜,其特征在于,所述有机无机杂化光散射助剂为有机聚合物包覆剂修饰的无机粒子;所述有机聚合物包覆剂为聚甲基丙烯酸甲酯PMMA、聚二甲基有机硅氧烷PDMS、聚碳酸酯、聚苯乙烯、硅烷偶联剂和甲基丙烯酸氯化铬络合物中的一种或多种;所述无机粒子为二氧化硅、二氧化钛、氧化锌、氧化锡、高岭土、坡缕石、蛭石、碳酸镁、醋酸锌、氧化铝和氧化镁中的一种或多种。
4.根据权利要求2所述的高透光漫散射农用膜,其特征在于,所述有机无机杂化光散射助剂的形貌为为花状、球状、片层状、海胆状、正立方体状和正四面体状中的一种或多种。
5.根据权利要求4所述的高透光漫散射农用膜,其特征在于,所述有机无机杂化光散射助剂的粒径为1~10μm。
6.根据权利要求3~5任一项所述的高透光漫散射农用膜,其特征在于,所述有机无机杂化光散射助剂中有机聚合物包覆剂的添加量为1~10wt%。
7.根据权利要求1所述的高透光漫散射农用膜,其特征在于,所述高透光漫散射农用膜还包括光稳定剂和抗氧化剂;所述光稳定剂为受阻酚类光稳定剂、邻羟基二苯甲酮类光稳定剂、苯并三唑类光稳定剂复配组成的复合光稳定剂或受阻酚类光稳定剂,光稳定剂的添加量为聚合物树脂基体的0.1~5wt%;所述抗氧化剂为抗氧化剂215,抗氧化剂的添加量为聚合物树脂基体的0.1~5wt%。
8.权利要求1~7任一项所述高透光漫散射农用膜的制备方法,其特征在于,包括如下步骤:
(1)将部分聚合物树脂基体与有机无机杂化光散射助剂混合,静置脱泡,得混合料;
(2)将混合料通过螺杆挤出机,得母料;
(3)将母料与剩余聚合物树脂基体混合,挤出吹胀,得高透光漫散射农用膜。
9.根据权利要求8所述高透光漫散射农用膜的制备方法,其特征在于,所述步骤(1)中,部分聚合物树脂基体的添加量为聚合物树脂基体的20%-50%。
10.根据权利要求8所述高透光漫散射农用膜的制备方法,其特征在于,所述步骤(2)中,螺杆挤出机料筒温度为190~230℃,机头和口模处温度为230~260℃;所述步骤(3)中,挤出吹胀的温度为150~195℃。
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CN117603523A (zh) * | 2024-01-23 | 2024-02-27 | 青州市鲁冠塑料有限公司 | 一种漫散射树脂组合物及其在散射膜中的应用 |
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