CN107933041A - 可播种的环保地膜及其制备方法 - Google Patents
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Abstract
本发明涉及一种可播种的环保地膜及其制备方法。所述可播种的环保地膜包括依次层叠的光降解薄膜层,相容层和增粘生物降解薄膜层;所述增粘生物降解薄膜层,以重量份计,包括原料组分:增粘剂10~20份,脂肪族聚酯树脂80~90份;所述相容层,以重量份计,包括原料组分:聚乙烯树脂70~90份,相容剂10~30份;所述光降解薄膜层,以重量份计,包括原料组分:复合树脂40~70份,填料20~50份,光降解剂0.4~1份,润滑剂1~3份。该可播种的环保地膜,其功能在于可以承载粘附植物种子,通过地膜铺盖同时实现播种;同时,该薄膜具有复合降解功能,在植物生长期间可以同时发生降解,减少了人工回收的成本,不会造成污染。
Description
技术领域
本发明涉及薄膜制品技术领域,特别是涉及一种可播种的环保地膜及其制备方法。
背景技术
地膜覆盖是一种农业栽培技术,具有增温保墒、防病抗虫和抑制杂草等作用,具有显著的增产效果。现已在我国得到广泛应用,据统计2015年全国地膜使用量超过144.1万吨,面积超过3.5亿亩。已有试验和应用效果也显示,地膜覆盖技术能使粮食作物增产20%~35%,经济作物增产20%~60%。带来了农业生产方式的变革,被称为“白色革命”。虽然地膜覆盖技术已对农业产生了重大的、积极的影响,但仍然存在一系列问题,如大量的地膜碎片会残留在土壤中,而在自然条件下,传统的聚乙烯地膜很难降解,不仅破坏土壤结构,影响农作物生长,还会造成严重环境污染。
目前,解决地膜残留问题主要有回收和降解两种方法。地膜的回收需投入大量人力和物力,成本较高,而且回收后再利用率较低。而现有的降解地膜仍然存在成本高、耐用性差、强度不高、降解不完全、降解周期不可控等问题。另外传统地膜需要在播种后再覆盖上去,增加了播种的人力物力。
发明内容
为解决上述技术问题,本发明提供一种可播种的环保地膜,在保证地膜力学性能和保湿增温等功能的同时,可将种子粘附在地膜上,通过地膜铺盖同时实现播种,且其降解完全,降解周期可控。
一种可播种的环保地膜,包括依次层叠的光降解薄膜层,相容层和增粘生物降解薄膜层;
其中,所述增粘生物降解薄膜层,用于粘附种子,以重量份计,包括原料组分:增粘剂10~20份,脂肪族聚酯树脂80~90份;
所述相容层,以重量份计,包括原料组分:聚乙烯树脂70~90份,相容剂10~30份;
所述光降解薄膜层,以重量份计,包括原料组分:复合树脂40~70份,填料20~50份,光降解剂0.4~1份,润滑剂1~3份;所述的复合树脂为质量比为1~5:1:1线型低密度聚乙烯、低密度聚乙烯和茂金属聚乙烯。
在其中一个实施例中,所述增粘生物降解薄膜层,以重量份计,包括增粘剂10~15份,脂肪族聚酯树脂85~90份;
所述相容层,以重量份计,包括聚乙烯树脂(PE)70~75份,相容剂25~30份;
所述光降解薄膜层,以重量份计,包括复合树脂65~70份,填料20~25份,光降解剂0.4~1份,润滑剂1~3份;所述的复合树脂为质量比为1~5:1:1线型低密度聚乙烯(LLDPE)、低密度聚乙烯(LDPE)和茂金属聚乙烯(mPE)。
在其中一个实施例中,所述复合树脂为质量比为3~4:1:1线型低密度聚乙烯(LLDPE)、低密度聚乙烯(LDPE)和茂金属聚乙烯(mPE)。
在其中一个实施例中,所述光降解剂为硬脂酸铈/TiO2复合光降解剂、硬脂酸铁/TiO2复合光降解剂中的一种或多种。
在其中一个实施例中,所述光降解剂为硬脂酸铈/TiO2复合光降解剂。
在其中一个实施例中,所述脂肪族聚酯树脂为聚乳酸(PLA)、聚丁二酸丁二醇酯(PBS)、聚己二酸/对苯二甲酸丁二酯(PBAT)中的一种或多种。
在其中一个实施例中,所述的增粘剂为聚异丁烯(PIB母料)、乙烯-乙酸乙烯酯共聚物(EVA)中的一种或多种。
在其中一个实施例中,所述脂肪族聚酯树脂为聚乳酸(PLA),所述增粘剂为聚异丁烯(PIB母料)。
在其中一个实施例中,所述聚乙烯树脂为线型低密度聚乙烯(LLDPE)、低密度聚乙烯(LDPE)中的一种或多种。
在其中一个实施例中,所述的相容剂为马来酸酐接枝低密度聚乙烯、马来酸酐接枝线型低密度聚乙烯中的一种或多种。
在其中一个实施例中,所述聚乙烯树脂为线型低密度聚乙烯(LLDPE),所述的相容剂为马来酸酐接枝LLDPE。
在其中一个实施例中,所述润滑剂为聚乙烯蜡(PE蜡)、硬脂酸中的一种或多种。
在其中一个实施例中,所述填料为1500~2500目的碳酸钙。
本发明还提供所述的可播种的环保地膜的制备方法,包括如下步骤:
将所述增粘生物降解薄膜层、相容层和光降解薄膜层的各原料组分分别混合后,三层共挤出吹膜,即得。
与现有技术相比,本发明具有以下有益效果:
本发明所述的可播种的环保地膜,设置了依次层叠的增粘生物降解薄膜层、相容层和光降解薄膜层,在合理控制各层各原料组分比例的基础上,在光降解薄膜层中,以特定重量比的LLDPE、LDPE和mPE作为复合树脂,配合在增粘生物降解薄膜层中采用脂肪族聚酯和增粘剂,在实现地膜降解的可控性的同时,能够对种子进行有效粘附,播种效果好;在光降解薄膜层和增粘生物降解薄膜层之间设置原料为聚乙烯树脂及相容剂的相容层。由此,本发明的可播种的环保地膜,在进行地膜铺盖保证地膜保湿增温效果的同时,可实现种子的播种,不仅可以减少人工播种的劳动力,而且提高了种子排布的规整性,有利于植物的生长。同时,该环保地膜具有较佳的耐用性和生物/光复合降解功能,在植物生长期间可以同时发生降解,降解周期可控,且降解完全,减少了人工回收地膜的成本,对环境和土壤不会造成污染,复合现代农业的发展趋势。
附图说明
图1为本发明一实施例中的可播种的环保地膜的结构示意图。
具体实施方式
以下结合具体实施例对本发明的可播种的环保地膜及其制备方法作进一步详细的说明。
本发明实施例中采用的各原料组分均为市售产品。
实施例1
本实施例一种可播种的环保地膜,如图1所示,包括增粘生物降解薄膜层100、相容层200和光降解薄膜层300;
其中,增粘生物降解薄膜层100,以重量份计,包括原料组分:PIB母料10份,PLA 90份;
相容层200,以重量份计,包括原料组分:LLDPE树脂70份,马来酸酐接枝LLDPE 30份;
光降解薄膜层300,以重量份计,包括原料组分:复合树脂(LLDPE/LDPE/mPE质量分数比例为3:1:1)70份,1500目活性碳酸钙20份,复合光降解剂脂酸铈/TiO2 1份,PE蜡1份。
上述可播种的环保地膜的制备方法,包括如下步骤:
将所述种子增粘生物降解薄膜层、相容层和光降解薄膜层的各原料组分分别混合后,通过ABC型三层共挤出吹膜,将种子均匀粘附于增粘生物降解薄膜层,即得产品。
实施例2
本实施例一种可播种的环保地膜,包括增粘生物降解薄膜层、相容层和光降解薄膜层;
其中,所述增粘生物降解薄膜层,以重量份计,包括原料组分:EVA 20份,PBS80份;
所述相容层,以重量份计,包括原料组分:LLDPE树脂90份,马来酸酐接枝LLDPE10份;
所述光降解薄膜层,以重量份计,包括原料组分:复合树脂(LLDPE/LDPE/mPE质量比为4:1:1)40份,2500目活性碳酸钙50份,复合光降解剂脂酸铈/TiO20.4份,PE蜡3份。
上述可播种的环保地膜的制备方法同实施例1。
实施例3
本实施例一种可播种的环保地膜,包括增粘生物降解薄膜层、相容层和光降解薄膜层;
其中,所述增粘生物降解薄膜层,以重量份计,包括原料组分:PIB增粘母料20份,PBAT90份;
所述相容层,以重量份计,包括原料组分:LDPE树脂80份,马来酸酐接枝LDPE20份;
所述光降解薄膜层,以重量份计,包括原料组分:复合树脂(LLDPE/LDPE/mPE质量比为3:1:1)60份,2000目活性碳酸钙40份,复合光降解剂脂酸铁/TiO20.6份,硬脂酸2份。
上述可播种的环保地膜的制备方法同实施例1。
实施例4
本实施例一种可播种的环保地膜,包括增粘生物降解薄膜层、相容层和光降解薄膜层;
其中,所述增粘生物降解薄膜层,以重量份计,包括原料组分:PIB增粘母料15份,PLA85份;
所述相容层,以重量份计,包括原料组分:LDPE树脂85份,马来酸酐接枝LDPE15份;
所述光降解薄膜层,以重量份计,包括原料组分:复合树脂(LLDPE/LDPE/mPE质量比为4:1:1)50份,1500目活性碳酸钙50份,复合光降解剂脂酸铁/TiO20.7份,硬脂酸2份。
上述可播种的环保地膜的制备方法同实施例1。
实施例5
本实施例一种可播种的环保地膜,包括增粘生物降解薄膜层、相容层和光降解薄膜层;
其中,所述增粘生物降解薄膜层,以重量份计,包括原料组分:PIB增粘母料20,PBS80份;
所述相容层,以重量份计,包括原料组分:LLDPE树脂45份,LDPE树脂35份,马来酸酐接枝LLDPE10份,马来酸酐接枝LDPE10份;
所述光降解薄膜层,以重量份计,包括原料组分:复合树脂(LLDPE/LDPE/mPE质量比为3:1:1)45份,2500目活性碳酸钙50份,复合光降解剂脂酸铁/TiO20.6份,硬脂酸1份。
上述可播种的环保地膜的制备方法同实施例1。
表1.不同薄膜的性能数据
样品 | 拉伸强度(MPa) | 断裂生长率(%) | 老化时间(d) |
实施例1 | 29.1 | 350 | 50-60 |
实施例2 | 21.1 | 230 | 60-70 |
实施例3 | 23.2 | 250 | 50-60 |
实施例4 | 20.5 | 200 | 30-40 |
实施例5 | 18.0 | 200 | 40-50 |
以上所述实施例的各技术特征可以进行任意的组合,为使描述简洁,未对上述实施例中的各个技术特征所有可能的组合都进行描述,然而,只要这些技术特征的组合不存在矛盾,都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。因此,本发明专利的保护范围应以所附权利要求为准。
Claims (10)
1.一种可播种的环保地膜,其特征在于,包括依次层叠的光降解薄膜层,相容层和增粘生物降解薄膜层;
其中,所述增粘生物降解薄膜层,用于粘附种子,以重量份计,包括原料组分:增粘剂10~20份,脂肪族聚酯树脂80~90份;
所述相容层,以重量份计,包括原料组分:聚乙烯树脂70~90份,相容剂10~30份;
所述光降解薄膜层,以重量份计,包括原料组分:复合树脂40~70份,填料20~50份,光降解剂0.4~1份,润滑剂1~3份;所述的复合树脂为质量比为1~5:1:1线型低密度聚乙烯、低密度聚乙烯和茂金属聚乙烯。
2.根据权利要求1所述的可播种的环保地膜,其特征在于,所述复合树脂为质量比为3~4:1:1线型低密度聚乙烯、低密度聚乙烯和茂金属聚乙烯。
3.根据权利要求1所述的可播种的环保地膜,其特征在于,所述光降解剂为硬脂酸铈/TiO2复合光降解剂、硬脂酸铁/TiO2复合光降解剂中的一种或多种。
4.根据权利要求1所述的可播种的环保地膜,其特征在于,所述脂肪族聚酯树脂为聚乳酸、聚丁二酸丁二醇酯、聚己二酸/对苯二甲酸丁二酯中的一种或多种。
5.根据权利要求4所述的可播种的环保地膜,其特征在于,所述的增粘剂为聚异丁烯、乙烯-乙酸乙烯酯共聚物中的一种或多种。
6.根据权利要求1-5任一项所述的可播种的环保地膜,其特征在于,所述聚乙烯树脂为线型低密度聚乙烯、低密度聚乙烯中的一种或多种。
7.根据权利要求6所述的可播种的环保地膜,其特征在于,所述相容剂为马来酸酐接枝低密度聚乙烯、马来酸酐接枝线型低密度聚乙烯中的一种或多种。
8.根据权利要求1-5任一项所述的可播种的环保地膜,其特征在于,所述润滑剂为聚乙烯蜡、硬脂酸中的一种或多种。
9.根据权利要求1-5任一项所述的可播种的环保地膜,其特征在于,所述填料为1500~2500目的碳酸钙。
10.权利要求1-9任一项所述的可播种的环保地膜的制备方法,其特征在于,包括如下步骤:
将所述增粘生物降解薄膜层、相容层和光降解薄膜层的各原料组分分别混合后,三层共挤出吹膜,即得。
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CN111703168A (zh) * | 2020-07-06 | 2020-09-25 | 郭树然 | 一种除草母粒、除草地膜及其制备方法 |
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CN1060006A (zh) * | 1991-09-19 | 1992-04-08 | 段晋宏 | 一种玉米定向播种方法 |
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CN109566210B (zh) * | 2018-12-07 | 2020-12-22 | 北京惠林苑生物科技有限公司 | 多层复合多功能全生物降解塑料地膜及其制备方法 |
CN111703168A (zh) * | 2020-07-06 | 2020-09-25 | 郭树然 | 一种除草母粒、除草地膜及其制备方法 |
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