CN108638545A - 一种环保lldpe缠绕膜的制备方法 - Google Patents

一种环保lldpe缠绕膜的制备方法 Download PDF

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CN108638545A
CN108638545A CN201810410145.7A CN201810410145A CN108638545A CN 108638545 A CN108638545 A CN 108638545A CN 201810410145 A CN201810410145 A CN 201810410145A CN 108638545 A CN108638545 A CN 108638545A
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顾黎明
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Suzhou Hui Xin Bang Mstar Technology Ltd
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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Abstract

本发明公开了一种环保LLDPE缠绕膜的制备方法,制备步骤为:1)醇溶液的制备;2)LLDPE分散液的制备;3)增塑LLDPE分散液的制备;4)改性LLDPE的制备;5)环保LLDPE缠绕膜的制备。本发明采用棕榈酸钙的正丁醇溶液处理LLDPE基体,可以有效地提高其耐热稳定性,之后通过引入柠檬酸,在催化剂作用下反应,得到增塑剂改性的基体原料,通过该反应改善了基体与各原料间的结合强度,同时,本发明无需再另外添加增塑剂原料,而且反应得到的柠檬酸酯环保性好,无有毒有害物质释放,使用安全性好。

Description

一种环保LLDPE缠绕膜的制备方法
技术领域
本发明属于膜材料制备领域,具体涉及一种环保LLDPE缠绕膜的制备方法。
背景技术
缠绕膜主要用于各种产品的销售和运输,其主要作用是稳固、遮盖和保护产品,所以缠绕膜必须具有较高的耐穿刺性、良好的收缩性和收缩应力。最初的缠绕膜以PVC 为主,随着对缠绕膜性能要求的不断提高,PVC 缠绕膜逐渐减少,而各种聚乙烯缠绕膜发展迅速。聚乙烯缠绕膜是一种韧性很好的材料,广泛适用于酒类、易拉罐类、矿泉水类、各种饮料类、布匹等产品的整件集合包装,该产品柔韧性好,抗撞击、抗撕裂性强,不易破损、不怕潮、收缩率大。
然而,目前大多数的缠绕膜只追求生产成本,采用了很多含有卤素的增塑剂,造成了环境污染,同时长期使用也会对人体造成一定的损害。
发明内容
本发明的目的在于针对现有技术的缺陷和不足,提供一种环保LLDPE缠绕膜的制备方法。
为实现上述目的,本发明采用以下技术方案:
一种环保LLDPE缠绕膜的制备方法,其制备步骤如下:
(1)取正丁醇、棕榈酸钙混合,在60-65℃下保温搅拌20-30分钟,加入混合料重量5-7倍的去离子水中,搅拌均匀,得醇溶液;
(2)取单硬脂酸甘油单酯,加入到上述醇溶液中,搅拌均匀,加入LLDPE,超声3-4分钟,得LLDPE分散液;
(3)取氰尿酸锌,加入到其重量10-17倍的去离子水中,加入柠檬酸,送入到反应釜中,加入上述LLDPE分散液,调节反应釜温度为90-95℃,加入催化剂,保温搅拌3-5小时,出料冷却,得增塑LLDPE分散液;
(4)取上述有机蒙脱土分散液,与增塑LLDPE分散液混合,在60-70℃下保温搅拌1-2小时,抽滤,将沉淀水洗,常温干燥,得改性LLDPE;
(5)取上述改性LLDPE,与硬脂酸锌混合,搅拌均匀,送入到送入到挤出机中,流延成膜,即得所述环保LLDPE缠绕膜。
优选地,按重量份数计,上述各原料为:LLDPE 130-150份、氰尿酸锌1-2份、柠檬酸17-20份、正丁醇13-20份、棕榈酸钙2-3份、有机蒙脱土分散液30-40份、催化剂0.1-0.2份、单硬脂酸甘油单酯0.8-1份、硬脂酸锌1-2份。
优选地,本发明所述的催化剂为对甲基苯磺酸。
优选地,本发明所述的有机蒙脱土分散液是由下述重量份的原料组成的:
蒙脱土粉60-70份、氧化聚乙烯蜡6-8份、蓖麻油聚氧乙烯醚1-2份、乙酸酐10-14份、酸催化剂0.01-0.02份、氯仿20-30份;所述的酸催化剂为浓度为96-98%的硫酸溶液。
更优选地,本发明所述有机蒙脱土分散液,其由以下步骤制得:
(1)取氧化聚乙烯蜡,加入到氯仿中,送入到55-60℃的恒温水浴中,保温搅拌1-2小时,出料冷却,得氯仿溶液;
(2)取乙酸酐,加入到其重量60-70倍的去离子水中,搅拌均匀,加入蒙脱土粉,升高温度为80-90℃,滴加上述酸催化剂,滴加完毕后保温搅拌2-3小时,得蒙脱土分散液;
(3)取上述氯仿溶液、蒙脱土分散液混合,超声10-20分钟,蒸馏除去氯仿,加入蓖麻油聚氧乙烯醚,即得所述有机蒙脱土分散液。
本发明的优点:
本发明的有机蒙脱土分散液中,首先采用乙酸酐对蒙脱土粉进行乙酰化改性,以浓硫酸为催化剂,之后与氧化聚乙烯蜡的氯仿溶液共混,以蓖麻油聚氧乙烯醚为分散剂,进一步塑化了蒙脱土,改善了其表面活性,从而改善了其与聚合物基体的分散相容性,提高了成品缠绕膜的品质。
本发明采用棕榈酸钙的正丁醇溶液处理LLDPE基体,可以有效地提高其耐热稳定性,之后通过引入柠檬酸,在催化剂作用下反应,得到增塑剂改性的基体原料,通过该反应不仅改善了基体与各原料间的结合强度,同时,本发明无需再另外添加增塑剂原料,而且反应得到的柠檬酸酯环保性好,无有毒有害物质释放,使用安全性好。
具体实施方式
实施例1
按重量份数计,称取如下原料:
LLDPE150份、氰尿酸锌2份、柠檬酸20份、正丁醇20份、棕榈酸钙3份、有机蒙脱土分散液40份、催化剂对甲基苯磺酸0.2份、单硬脂酸甘油单酯1份、硬脂酸锌2份。
其中,有机蒙脱土分散液是由下述重量份的原料制成的:
蒙脱土粉70份、氧化聚乙烯蜡8份、蓖麻油聚氧乙烯醚2份、乙酸酐14份、浓度为98%的硫酸溶液的酸催化剂0.02份、氯仿30份;
该有机蒙脱土分散液的制备方法为以下步骤:
(1)取氧化聚乙烯蜡,加入到氯仿中,送入到60℃的恒温水浴中,保温搅拌2小时,出料冷却,得氯仿溶液;
(2)取乙酸酐,加入到其重量70倍的去离子水中,搅拌均匀,加入蒙脱土粉,升高温度为90℃,滴加上述酸催化剂,滴加完毕后保温搅拌3小时,得蒙脱土分散液;
(3)取上述氯仿溶液、蒙脱土分散液混合,超声20分钟,蒸馏除去氯仿,加入蓖麻油聚氧乙烯醚,即得所述有机蒙脱土分散液。
本实施例的环保LLDPE缠绕膜,由以下步骤制得:
(1)取正丁醇、棕榈酸钙混合,在65℃下保温搅拌30分钟,加入混合料重量7倍的去离子水中,搅拌均匀,得醇溶液;
(2)取单硬脂酸甘油单酯,加入到上述醇溶液中,搅拌均匀,加入LLDPE,超声3分钟,得LLDPE分散液;
(3)取氰尿酸锌,加入到其重量17倍的去离子水中,加入柠檬酸,送入到反应釜中,加入上述LLDPE分散液,调节反应釜温度为95℃,加入催化剂,保温搅拌5小时,出料冷却,得增塑LLDPE分散液;
(4)取上述有机蒙脱土分散液,与增塑LLDPE分散液混合,在70℃下保温搅拌2小时,抽滤,将沉淀水洗,常温干燥,得改性LLDPE;
(5)取上述改性LLDPE,与硬脂酸锌混合,搅拌均匀,送入到挤出机中,流延成膜,即得所述环保LLDPE缠绕膜。
实施例2
按重量份数计,称取如下原料:
LLDPE 130份、氰尿酸锌1份、柠檬酸17份、正丁醇13份、棕榈酸钙2份、有机蒙脱土分散液30份、催化剂对甲基苯磺酸0.1份、单硬脂酸甘油单酯0.8份、硬脂酸锌1份。
所述的有机蒙脱土分散液是由下述重量份的原料组成的:
蒙脱土粉60份、氧化聚乙烯蜡6份、蓖麻油聚氧乙烯醚1份、乙酸酐10份、浓度为96%的硫酸溶液的酸催化剂0.01份、氯仿20份;
所述有机蒙脱土分散液,其由以下步骤制得:
(1)取氧化聚乙烯蜡,加入到氯仿中,送入到55℃的恒温水浴中,保温搅拌1小时,出料冷却,得氯仿溶液;
(2)取乙酸酐,加入到其重量60倍的去离子水中,搅拌均匀,加入蒙脱土粉,升高温度为80℃,滴加上述酸催化剂,滴加完毕后保温搅拌2小时,得蒙脱土分散液;
(3)取上述氯仿溶液、蒙脱土分散液混合,超声10分钟,蒸馏除去氯仿,加入蓖麻油聚氧乙烯醚,即得所述有机蒙脱土分散液。
本实施例的环保LLDPE缠绕膜,由以下步骤制得:
(1)取正丁醇、棕榈酸钙混合,在60℃下保温搅拌20分钟,加入混合料重量5倍的去离子水中,搅拌均匀,得醇溶液;
(2)取单硬脂酸甘油单酯,加入到上述醇溶液中,搅拌均匀,加入LLDPE,超声3分钟,得LLDPE分散液;
(3)取氰尿酸锌,加入到其重量10倍的去离子水中,加入柠檬酸,送入到反应釜中,加入上述LLDPE分散液,调节反应釜温度为90℃,加入催化剂,保温搅拌3小时,出料冷却,得增塑LLDPE分散液;
(4)取上述有机蒙脱土分散液,与增塑LLDPE分散液混合,在60℃下保温搅拌1小时,抽滤,将沉淀水洗,常温干燥,得改性LLDPE;
(5)取上述改性LLDPE,与硬脂酸锌混合,搅拌均匀,送入到挤出机中,流延成膜,即得所述环保LLDPE缠绕膜。
对实施例1和2制得的环保LLDPE缠绕膜进行性能测试:
断裂拉伸强度:25-30MPa;
断裂伸长率:310-400%;
热收缩率(130℃×20秒)MD:>60。

Claims (5)

1.一种环保LLDPE缠绕膜的制备方法,其特征在于:制备步骤如下:
(1)取正丁醇、棕榈酸钙混合,在60-65℃下保温搅拌20-30分钟,加入混合料重量5-7倍的去离子水中,搅拌均匀,得醇溶液;
(2)取单硬脂酸甘油单酯,加入到上述醇溶液中,搅拌均匀,加入LLDPE,超声3-4分钟,得LLDPE分散液;
(3)取氰尿酸锌,加入到其重量10-17倍的去离子水中,加入柠檬酸,送入到反应釜中,加入上述LLDPE分散液,调节反应釜温度为90-95℃,加入催化剂,保温搅拌3-5小时,出料冷却,得增塑LLDPE分散液;
(4)取上述有机蒙脱土分散液,与增塑LLDPE分散液混合,在60-70℃下保温搅拌1-2小时,抽滤,将沉淀水洗,常温干燥,得改性LLDPE;
(5)取上述改性LLDPE,与硬脂酸锌混合,搅拌均匀,送入到送入到挤出机中,流延成膜,即得所述环保LLDPE缠绕膜。
2.根据权利要求1所述的一种环保LLDPE缠绕膜的制备方法,其特征在于:按重量份数计,各原料为:LLDPE 130-150份、氰尿酸锌1-2份、柠檬酸17-20份、正丁醇13-20份、棕榈酸钙2-3份、有机蒙脱土分散液30-40份、催化剂0.1-0.2份、单硬脂酸甘油单酯0.8-1份、硬脂酸锌1-2份。
3.根据权利要求1或2所述的一种环保LLDPE缠绕膜的制备方法,其特征在于:所述的催化剂为对甲基苯磺酸。
4.根据权利要求1或2所述的一种环保LLDPE缠绕膜的制备方法,其特征在于:所述的有机蒙脱土分散液是由下述重量份的原料组成的:
蒙脱土粉60-70份、氧化聚乙烯蜡6-8份、蓖麻油聚氧乙烯醚1-2份、乙酸酐10-14份、酸催化剂0.01-0.02份、氯仿20-30份;所述的酸催化剂为浓度为96-98%的硫酸溶液。
5.根据权利要求4所述的一种环保LLDPE缠绕膜的制备方法,其特征在于:所述有机蒙脱土分散液,其由以下步骤制得:
(1)取氧化聚乙烯蜡,加入到氯仿中,送入到55-60℃的恒温水浴中,保温搅拌1-2小时,出料冷却,得氯仿溶液;
(2)取乙酸酐,加入到其重量60-70倍的去离子水中,搅拌均匀,加入蒙脱土粉,升高温度为80-90℃,滴加上述酸催化剂,滴加完毕后保温搅拌2-3小时,得蒙脱土分散液;
(3)取上述氯仿溶液、蒙脱土分散液混合,超声10-20分钟,蒸馏除去氯仿,加入蓖麻油聚氧乙烯醚,即得所述有机蒙脱土分散液。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019210684A1 (zh) * 2018-05-02 2019-11-07 苏州聚慧邦新材料科技有限公司 一种环保lldpe缠绕膜

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105754205A (zh) * 2016-04-07 2016-07-13 苏州市鼎立包装有限公司 一种拉伸缠绕膜及其制备方法
CN107815011A (zh) * 2017-11-03 2018-03-20 苏州工业园区汇统科技有限公司 一种透明缠绕膜及其制备方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105754205A (zh) * 2016-04-07 2016-07-13 苏州市鼎立包装有限公司 一种拉伸缠绕膜及其制备方法
CN107815011A (zh) * 2017-11-03 2018-03-20 苏州工业园区汇统科技有限公司 一种透明缠绕膜及其制备方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019210684A1 (zh) * 2018-05-02 2019-11-07 苏州聚慧邦新材料科技有限公司 一种环保lldpe缠绕膜

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