CN108357173A - 一种乙烯-乙酸乙烯酯共聚物eva吹塑棚膜及其制备方法 - Google Patents
一种乙烯-乙酸乙烯酯共聚物eva吹塑棚膜及其制备方法 Download PDFInfo
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Abstract
本发明属于农用薄膜制造领域,具体涉及一种乙烯‑‑乙酸乙烯酯共聚物EVA吹塑棚膜‑‑‑‑水晶膜及其制备方法,所述的水晶膜是采用三层共挤吹塑工艺,各层所用树脂按如下要求选用,按比例加入A、B、C三种功能母料,经三层共挤工艺吹塑成型。外层为抗紫外线耐老化层,中层为流滴保温层,内层为减雾流滴保温层;本发明通过采用三层配方的设计,采用EVA树脂和复合保温剂,解决高保温和高透光的矛盾问题,解决生产过程中结晶水析出和产品发涩断膜的生产难题,使产品实现高保温和高透光,有效提高棚内温度。
Description
技术领域
本发明属于农用薄膜制造领域,具体涉及一种乙烯--乙酸乙烯酯共聚物EVA 吹塑棚膜----水晶膜及其制备方法,适用于蔬菜、瓜果、花卉及其它经济作物的育苗、种植及农村养殖业的温室棚面覆盖。
背景技术
随着人们生活水平的提高,反季节蔬菜、瓜果的种植,更能给农户带来可观的经济效益,农民需要将种植的产品尽早成熟推向市场。因此,他们迫切需要一种高保温、高透光,防尘、防病的农膜来加快作物的生长。而目前农用膜市场上品种虽然很多,但质量参差不齐,尤其是在高端膜市场上,一直处于落后状态。各生产厂家在产品研发上投入较少,产品更新换代较慢,满足不了农户日益增长的需求。
目前,功能性农膜的产品主要采用线型低密度聚乙烯和EVA树脂添加部分功能性母料制造。由于功能性母料中保温剂大都选用硅质沉积岩(主要成分 SiO2),产品在保温性和透光性存在一定缺陷,满足不了用户对高保温和高透光的需求。层状双金属氢氧化物(水滑石)是一类具有层状结构的新型无机功能材料,使用这种材料可提高制品的保温性和透光性,但在生产时由于材料特性,加工工艺复杂,使很多厂家无法生产。
棚膜生产过程中,母料的应用在很大程度上决定了产品的各项性能。塑料母料是一种新的塑料加工助剂,由于母料的出现,对推动塑料工业的迅速发展,起了很大作用。其主要特点是:可以简化生产工艺过程;原料混合方便,混炼质量均匀;提高生产效率及制品性能指标;减少粉尘飞扬及对设备的磨损;提高产品质量。塑料母料原有的生产工艺是各种原料及助剂经高速混合机混合后,用双螺杆挤出机进行造粒,经水槽水冷、风刀吹干后切粒成型。该生产工艺有很多弊病:高速混合时产生大量粉尘,不仅影响周围环境,而且对操作工身体造成伤害,并且部分助剂流失;双螺杆挤出过程中温度较高,有些助剂容易挥发,影响棚膜的质量;料条经过水槽后,虽然经过风刀吹干,但有时会有潮湿现象,吹膜时产生气泡,形成废品;流滴剂和减雾剂在母料里分散不好,产生析出现象,影响产品功能性和外观。这些问题一直困扰着各个生产厂家很多年,如果不加以解决,次产品将无法生产,最终会影响公司产品的市场占有率,久而久之将被市场所淘汰。
发明内容
本发明的目的在于提供一种乙烯--乙酸乙烯酯共聚物EVA吹塑棚膜----水晶膜,采用EVA树脂和复合保温剂,解决高保温和高透光的矛盾问题,解决生产过程中结晶水析出和产品发涩断膜的生产难题,使产品实现高保温和高透光,有效提高棚内温度。具体技术方案如下:
一种乙烯-乙酸乙烯酯共聚物EVA吹塑棚膜,采用三层共挤吹塑工艺制备而成,各层原料按质量百分比如下:
外层,即抗紫外线耐老化层:
低密度聚乙烯LDPE/线型低密度聚乙烯LLDPE:89~91%
流滴类功能母料A:7.9~8.1%,长寿类功能母料C:1.9~2.1%中层,即流滴保温层:
EVA树脂:84~86%,流滴类功能母料A:14~16%;
内层,即减雾流滴保温层:
EVA树脂:84~86%,减雾流滴功能母料B:14-16%;
所述流滴类功能母料A的各组分及质量百分比为:
线型低密度聚乙烯LLDPE:39~41%,EVA树脂:33~34%
受阻胺光稳定剂TH944:1.9~2.1%,复合抗氧剂B215:0.9~1.1%,流滴剂KF650:14.9~15.1%,水滑石复合保温剂:7.9~8.1%;
所述减雾流滴功能母料B的各组分及质量百分比为:
线型低密度聚乙烯LLDPE:40~42%,EVA树脂:33~34%
受阻胺光稳定剂TH944:1.9~2.1%,复合抗氧剂B215:0.9~1.1%
流滴剂KF650:12.9~13.1%,水滑石复合保温剂:7.9~8.1%,
消雾剂:0.9~1.1%;
所述长寿类功能母料C的各组分及质量百分比为:
线型低密度聚乙烯LLDPE:87~89%,受阻胺光稳定剂TH944:7.5~8.5%
复合抗氧剂B215:3.5~4.5%。
上述EVA树脂中VA含量优选8-12%,MI=0.5~1.0g/min。
本发明还提供了该乙烯-乙酸乙烯酯共聚物EVA吹塑棚膜的制备方法,包括如下步骤
1)将流滴类功能母料A、减雾流滴功能母料B各组分分别准确称量,投入密炼机中搅拌、混炼、捏合,经单螺杆挤出机造粒后备用,混炼温度180℃以下,混炼时间20~30分钟;将长寿类功能母料C各组分准确称量,投入高速混合机中搅拌均匀,经双螺杆挤出机造粒风干备用;
2)将外层、中层和内层各层组分准确称量好,用混料器搅拌,使物料混合均匀,分别送入三台双螺杆挤出机,挤出机长径比为30:1,模头为三层复合中心进料型,物料分别经三台双螺杆挤出机的熔融、塑化、挤出到三层共挤模头经螺旋体继续塑化,经过圆形口模共同挤出,从圆形口模挤出复合筒状膜管,膜管在模心吹进的压缩空气吹胀作用下横向拉伸,同时经过圆形风口的冷却和上牵引夹辊的纵向牵伸,最后经插板插叠和收卷而制得水晶膜。
本发明的有益效果
本发明通过采用三层配方的设计,采用EVA树脂和复合保温剂,解决高保温和高透光的矛盾问题,解决生产过程中结晶水析出和产品发涩断膜的生产难题,使产品实现高保温和高透光,有效提高棚内温度。经对棚膜的红外线透过率测试,普通PE膜的红外线透过率是72%,EVA膜的红外线透过率是44%,水晶膜的红外线透过率是36%,因此水晶膜保温性能更佳。此产品的生产,填补了高端膜市场的空白,无论是在生产过程控制还是在产品应用上,都有了一个质的飞跃。
附图说明
本发明共有2幅附图
图1为母料生产工艺流程图;
图2为棚膜生产工艺流程图;
具体实施方式
下面结合附图和具体实施例对本发明作进一步说明。
实施例1
一种乙烯--乙酸乙烯酯共聚物(EVA)吹塑棚膜----水晶膜(简称“水晶膜”) 的制备:
所述的水晶膜的制备是采用三层共挤吹塑工艺,各层所用树脂按如下要求选用,按比例加入A、B、C三种功能母料,经三层共挤工艺吹塑成型。各层原料按质量百分比选取如下:
外层(抗紫外线耐老化层):
线型低密度聚乙烯(LDPE):45%,线型低密度聚乙烯(LLDPE):45%
功能母料A:8%,功能母料C:2%
中层(流滴保温层):
EVA树脂(VA含量12%,MI=0.5~1.0g/min):85%,功能母料A:15%内层(减雾流滴保温层):
EVA树脂(VA含量12%):85%,功能母料B:15%
A、流滴保温类母料的制备:
低密度聚乙烯粉料(LLDPE):30.5kg,EVA树脂:25kg,受阻胺光稳定剂 (TH944):1.5kg,复合抗氧剂(B215):0.75kg,流滴剂(KF650):11.25kg,水滑石复合保温剂:6kg;
B、减雾流滴保温类母料的制备:
低密度聚乙烯粉料(LLDPE):31.5kg,EVA树脂:25kg,受阻胺光稳定剂 (TH944):1.5kg,复合抗氧剂(B215):0.75kg,流滴剂(KF650):9.75kg,水滑石复合保温剂:6kg,消雾剂:0.5kg;
C、长寿功能母料的制备:
低密度聚乙烯粉料(LLDPE):88kg,受阻胺光稳定剂(TH944):8kg,复合抗氧剂(B215):4kg。
以上A、B两种母料各组分准确称量,投入密炼机中搅拌、捏合,经单螺杆挤出机造粒后备用。混炼温度180℃以下,混炼时间20~30分钟;将以上C各组分准确称量,投入高速混合机中搅拌均匀,经双螺杆挤出机造粒风干备用。
按照配方,用电子秤准确地称量各种助剂。然后投放到密炼机加料口中,降下加压盖,混炼、捏合20~30分钟。混炼时要特别注意混炼温度与混炼时间。混炼温度高有利于塑料的塑性流动和变形,有利于粉料对EVA及固体助剂粒子表面的湿润和混合吃粉,但又使塑料的粘度下降,不利于助剂粒子的破碎与分散混合。混炼温度过高还会加速塑料的热氧老化,使塑料的物理机械性能下降,还会使助剂产生挥发现象;但温度也不能太低,否则会出现塑料压散现象。混炼时,温度呈稳步上升的过程。延长混炼时间能提高助剂的分散度,但也会降低生产效率。混炼时间过长又容易造成塑料过炼而使塑料的物理机械性能受到损害,因此混炼时间20~30分钟最佳。
混炼完成后经斗提将料团送入单螺杆挤出机中,依靠螺杆旋转产生的压力及剪切力,能使得物料可以充分进行塑化以及均匀混合,通过口模成型,经切粒机切粒成型,旋风分离器除湿,产出成品。母料生产工艺流程图详见图1。
吹膜时采用三层共挤设备,机组共有三套挤出机。内层由中心进料,中层和外层由侧面进料,原料混炼后经机头流道进一步均化,在特定的位置复合,形成三层不同原料组成的结合紧密、分层明显的管状料胚从机头口部挤出。通过控制内冷风机进、排风量,把管状料胚吹胀到所需要的直径,同时由内、外风环送出的空气冷却定型。定型的膜泡经过人字板和插板进入第一牵引装置,插板机构可将薄膜制品在进入牵引装置压辊之前进行折叠。为此,可减少收卷装置的体积以及成品膜卷的尺寸,方便产品的储存和运输。
将三层各组分准确称量,称量好的物料用混料器搅拌15min,使物料混合均匀,分别送入三台挤出机中。挤出机长径比为30:1,模头为三层复合中心进料型。物料分别经三台挤出机的熔融、塑化、挤出到三层共挤模头经螺旋体继续塑化,经过圆形口模共同挤出。从圆形口模挤出复合筒状膜管,膜管在模心吹进的压缩空气吹胀作用下横向拉伸,同时经过圆形风口的冷却和上牵引夹辊的纵向牵伸,最后经插板插叠和收卷而制得水晶膜。
采用平挤上吹法工艺,将各种聚乙烯树脂及母料加入混料缸中搅拌均匀,经吸料器倒入挤出机料斗中,通过挤出机塑化,由机头、口模挤出膜,吹胀、冷却后,经过插板、夹板进入牵引辊再通过若干导辊后进行卷取。棚膜生产工艺流程图,见图2
经对棚膜的红外线透过率测试,普通PE膜的红外线透过率是72%,EVA膜的红外线透过率是44%,水晶膜的红外线透过率是36%,因此水晶膜保温性能更佳。此产品的生产,填补了高端膜市场的空白,无论是在生产过程控制还是在产品应用上,都有了一个质的飞跃。
Claims (3)
1.一种乙烯-乙酸乙烯酯共聚物EVA吹塑棚膜,采用三层共挤吹塑工艺制备而成,其特征在于,各层原料按质量百分比如下:
外层,即抗紫外线耐老化层:
低密度聚乙烯LDPE/线型低密度聚乙烯LLDPE:89~91%
流滴类功能母料A:7.9~8.1%
长寿类功能母料C:1.9~2.1%
中层,即流滴保温层:
EVA树脂:84~86%
流滴类功能母料A:14~16%;
内层,即减雾流滴保温层:
EVA树脂:84~86%
减雾流滴功能母料B:14-16%;
所述流滴类功能母料A的各组分及质量百分比为:
线型低密度聚乙烯LLDPE:39~41%
EVA树脂:33~34%
受阻胺光稳定剂TH944:1.9~2.1%
复合抗氧剂B215:0.9~1.1%
流滴剂KF650:14.9~15.1%
水滑石复合保温剂:7.9~8.1%;
所述减雾流滴功能母料B的各组分及质量百分比为:
线型低密度聚乙烯LLDPE:40~42%
EVA树脂:33~34%
受阻胺光稳定剂TH944:1.9~2.1%
复合抗氧剂B215:0.9~1.1%
流滴剂KF650:12.9~13.1%,
水滑石复合保温剂:7.9~8.1%,
消雾剂:0.9~1.1%;
所述长寿类功能母料C的各组分及质量百分比为:
线型低密度聚乙烯LLDPE:87~89%,
受阻胺光稳定剂TH944:7.5~8.5%
复合抗氧剂B215:3.5~4.5%。
2.根据权利要求1所述的乙烯-乙酸乙烯酯共聚物EVA吹塑棚膜,其特征在于,所述的EVA树脂中VA含量8-12%,MI=0.5~1.0g/min。
3.根据权利要求1所述的乙烯-乙酸乙烯酯共聚物EVA吹塑棚膜的制备方法,其特征在于,包括如下步骤
1)将流滴类功能母料A、减雾流滴功能母料B各组分分别准确称量,投入密炼机中搅拌、混炼、捏合,经单螺杆挤出机造粒后备用,混炼温度180℃以下,混炼时间20~30分钟;将长寿类功能母料C各组分准确称量,投入高速混合机中搅拌均匀,经双螺杆挤出机造粒风干备用;
2)将外层、中层和内层各层组分准确称量好,用混料器搅拌,使物料混合均匀,分别送入三台双螺杆挤出机,挤出机长径比为30:1,模头为三层复合中心进料型,物料分别经三台双螺杆挤出机的熔融、塑化、挤出到三层共挤模头经螺旋体继续塑化,经过圆形口模共同挤出,从圆形口模挤出复合筒状膜管,膜管在模心吹进的压缩空气吹胀作用下横向拉伸,同时经过圆形风口的冷却和上牵引夹辊的纵向牵伸,最后经插板插叠和收卷而制得水晶膜。
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