CN104098829B - 一种透水蒸气聚乙烯膜及其制备方法 - Google Patents
一种透水蒸气聚乙烯膜及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种透水蒸气聚乙烯膜及其制备方法，称取LLDPE、高岭土、碳酸钙、氢化聚异丁烯、乙二醇单硬脂酸酯、三元乙丙橡胶、石蜡、甲基乙烯基环硅氧烷、油酸酰胺、聚丁二烯、异味消除剂、硫酸亚铁、绢云母和抗菌剂，将原料挤出后吹塑、拉伸成膜；产品对大肠杆菌抗菌率99%‑99.8%，对金黄色葡萄球菌抗菌率99%‑99.5%；撕裂强度3.43‑3.45N，拉伸强度12‑15MPa；气孔隙率31‑35%，纵向伸长率100%；水蒸气透过率4950‑5200g/（m2·24h）。
Description
技术领域
本发明涉及一种聚乙烯膜材料，尤其涉及一种透水蒸气聚乙烯膜及其制备方法，属于塑料材料技术领域。
背景技术
线性低密度聚乙烯在结构上不同于一般的低密度聚乙烯，因为不存在长支链。LLDPE的线性度取决于LLDPE和LDPE的不同生产加工过程。LLDPE通常在更低温度和压力下，由乙烯和高级的a烯烃如丁烯、己烯或辛烯共聚合而生成。共聚过程生成的LLDPE聚合物具有比一般LDPE更窄的分子量分布，同时具有线性结构使其有着不同的流变特性。LLDPE的熔融流动特性适应新工艺的要求，特别是用薄膜挤出工艺，可产出高质的LLDPE产品。LLDPE应用于聚乙烯所有的传统市场，增强了抗伸、抗穿透、抗冲击和抗撕裂的性能，使LLDPE适于作薄膜。它的优异的抗环境应力开裂性，抗低温冲击性和抗翘曲性使
LLDPE对管材、板材挤塑和所有模塑应用都有吸引力。 LLDPE最新的应用是作为地膜用于废渣填埋和废液池的衬层。
LDPE和LLDPE都具有极好的流变性或熔融流动性。LLDPE有更小的剪切敏感性，因为它具有窄分子量分布和短支链。在剪切过程中（例如挤塑），LLDPE保持了更大的粘度，因而比相同熔融指数的LDPE难于加工。在挤塑中，LLDPE更低的剪切敏感性使聚合物分子链的应力松弛更快，并且由此物理性质对吹胀比改变的敏感性减校在熔体延伸中，LLDPE在各种应变速率下通常都具有较低的粘度。也就是说它将不会象LDPE一样在拉伸时产生应变硬化。随聚乙烯的形变率增加．LDPE显示出粘度的惊人增加，这是由分子链缠结引起。这种现象在
LLDPE中观察不出，因为在LLDPE中缺少长支链使聚合物不缠结。这种性能对薄膜应用极重要．因为 LLDPE薄膜在保持高强度和韧性下召易制更薄薄膜。
LLDPE已渗透到聚乙烯的大多数传统市场，包括薄膜、模塑、管材和电线电缆。防渗漏地膜是新开发的LLDPE市场地膜，一种大型挤出片材，用作废渣填埋和废物池衬垫，防止渗漏或污染周围地区。LLDPE的一些薄膜市场，例如生产袋子、垃圾袋、弹性包装物、工业用衬套、巾式衬套和购物袋，这些都是利用改进强度和韧性后这种树脂的优点。透明薄膜，例如面包袋，一直由LDPE占统治地位，因为它有更好的浊度。然而，LLDPE与LDPE的共混物将改进强度。
LDPE薄膜主要采用挤出吹塑法和T模法生产的LDPE薄膜是一种柔韧而透明的薄膜，无毒、无嗅，厚度一般在0.02～0.1㎜之间。具有良好的耐水性、防潮性、耐旱性和化学稳定性。大量用于食品、药品、日用品及金属制品的一般防潮包装和冷冻食品的包装。但对于吸湿性大，防潮性要求较高的物品，则需要采用防潮性更好的薄膜和复合薄膜包装。LDPE薄膜的透气率大、无保香性且耐油性差，不能用于易氧化食品、风味食品和含油食品的包装。但透气性好使它能用于水果、蔬菜等新鲜物品的保鲜包装。LDPE薄膜的热粘合性和低温热封性好，因此常用作复合薄膜的粘合层和热封层等，但由于其耐热性差，故不能用作蒸煮袋的热封层。
中国专利CN102317356A，公开日为2012年1月11日，公开了一种具有改进的阻隔性能的聚乙烯膜，主要采用高密度聚乙烯吹塑制成，解决了透氧气率和透水蒸气率低的缺陷，但是撕裂强度、拉伸强度、气孔隙率和伸长率等没有改进，随着社会城市化、科技化、人性化的发展，设计一种撕裂强度、拉伸强度、气孔隙率和伸长率高的透水蒸气聚乙烯膜及其制备方法，以满足市场需求，是非常必要的。
发明内容
解决的技术问题：
本申请针对现有LLDPE膜撕裂强度、拉伸强度、气孔隙率和伸长率没有很大改进的技术问题，提供一种利用透水蒸气聚乙烯膜及其制备方法。
技术方案：
一种透水蒸气聚乙烯膜，原料按重量份数配比如下：LLDPE100份，高岭土5-25份，碳酸钙50-60份，氢化聚异丁烯35-45份，乙二醇单硬脂酸酯20-40份，三元乙丙橡胶15-25份，石蜡2-8份，甲基乙烯基环硅氧烷10-20份，油酸酰胺1-5份，聚丁二烯5-15份，异味消除剂0.03-0.07份，硫酸亚铁0.5-1.5份，绢云母15-35份，抗菌剂1-3份。
作为本发明的一种优选技术方案：所述透水蒸气聚乙烯膜的原料按重量份数配比如下：LLDPE100份，高岭土10-20份，碳酸钙52-58份，氢化聚异丁烯37-43份，乙二醇单硬脂酸酯25-35份，三元乙丙橡胶18-22份，石蜡4-6份，甲基乙烯基环硅氧烷13-18份，油酸酰胺2-4份，聚丁二烯8-12份，异味消除剂0.04-0.06份，硫酸亚铁0.7-1.3份，绢云母20-30份，抗菌剂1.5-2.5份。
作为本发明的一种优选技术方案：所述透水蒸气聚乙烯膜的原料按重量份数配比如下：LLDPE100份，高岭土15份，碳酸钙55份，氢化聚异丁烯40份，乙二醇单硬脂酸酯30份，三元乙丙橡胶20份，石蜡5份，甲基乙烯基环硅氧烷15份，油酸酰胺3份，聚丁二烯10份，异味消除剂0.05份，硫酸亚铁1份，绢云母25份，抗菌剂2份。
作为本发明的一种优选技术方案：所述异味消除剂采用沸石、乙酸甲酯或纳米二氧化钛。
作为本发明的一种优选技术方案：所述抗菌剂采用纳米磷酸锆载银抗菌剂。
作为本发明的一种优选技术方案：所述透水蒸气聚乙烯膜的制备方法步骤为：
第一步：按重量份数配比称取LLDPE、高岭土、碳酸钙、氢化聚异丁烯和乙二醇单硬脂酸酯，升温至70-90℃搅拌均匀；
第二步：依次加入三元乙丙橡胶、石蜡、甲基乙烯基环硅氧烷和油酸酰胺，升温至100-110℃，混合均匀后加入剩余原料，搅拌10-30min；
第三步：将第二步搅拌后的物料在190-210℃下挤出，吹塑成60-65μm厚的膜，在80℃下按纵向拉伸比2:1拉伸即可。
有益效果：
本发明所述一种透水蒸气聚乙烯膜及其制备方法采用以上技术方案和现有技术相比，具有以下技术效果：1、产品对大肠杆菌抗菌率99%-99.8%，对金黄色葡萄球菌抗菌率99%-99.5%；2、撕裂强度3.43-3.45N，拉伸强度12-15MPa；3、气孔隙率31-35%，纵向伸长率100%；4、水蒸气透过率4950-5200g/（m2·24h），并可消除异味，可以广泛生产并不断代替现有材料。
具体实施方式
实施例
1:
按重量份数配比称取LLDPE100份，高岭土5份，碳酸钙50份，氢化聚异丁烯35份，乙二醇单硬脂酸酯20份，三元乙丙橡胶15份，石蜡2份，甲基乙烯基环硅氧烷10份，油酸酰胺1份，聚丁二烯5份，纳米二氧化钛0.03份，硫酸亚铁0.5份，绢云母15份，纳米磷酸锆载银抗菌剂1份，按重量份数配比称取LLDPE、高岭土、碳酸钙、氢化聚异丁烯和乙二醇单硬脂酸酯，升温至70℃搅拌均匀，依次加入三元乙丙橡胶、石蜡、甲基乙烯基环硅氧烷和油酸酰胺，升温至100℃，混合均匀后加入剩余原料，搅拌10min，搅拌后在190℃下挤出，吹塑成60μm厚的膜，在80℃下按纵向拉伸比2:1拉伸即可。
产品对大肠杆菌抗菌率99%，对金黄色葡萄球菌抗菌率99.1%；撕裂强度3.43N，拉伸强度12MPa；气孔隙率31%，纵向伸长率100%；水蒸气透过率4950-5200g/（m2·24h）。
实施例
2:
按重量份数配比称取LLDPE100份，高岭土25份，碳酸钙60份，氢化聚异丁烯45份，乙二醇单硬脂酸酯40份，三元乙丙橡胶25份，石蜡8份，甲基乙烯基环硅氧烷20份，油酸酰胺5份，聚丁二烯15份，纳米二氧化钛0.07份，硫酸亚铁1.5份，绢云母35份，纳米磷酸锆载银抗菌剂3份，按重量份数配比称取LLDPE、高岭土、碳酸钙、氢化聚异丁烯和乙二醇单硬脂酸酯，升温至70-90℃搅拌均匀，依次加入三元乙丙橡胶、石蜡、甲基乙烯基环硅氧烷和油酸酰胺，升温至100-110℃，混合均匀后加入剩余原料，搅拌10-30min，搅拌后在190-210℃下挤出，吹塑成60-65μm厚的膜，在80℃下按纵向拉伸比2:1拉伸即可。
产品对大肠杆菌抗菌率99.2%，对金黄色葡萄球菌抗菌率99.2%；撕裂强度3.43N，拉伸强度13MPa；气孔隙率32%，纵向伸长率100%；水蒸气透过率4960g/（m2·24h）。
实施例
3:
按重量份数配比称取LLDPE100份，高岭土10份，碳酸钙52份，氢化聚异丁烯37份，乙二醇单硬脂酸酯25份，三元乙丙橡胶18份，石蜡4份，甲基乙烯基环硅氧烷13份，油酸酰胺2份，聚丁二烯8份，乙酸甲酯0.04份，硫酸亚铁0.7份，绢云母20份，纳米磷酸锆载银抗菌剂1.5份，按重量份数配比称取LLDPE、高岭土、碳酸钙、氢化聚异丁烯和乙二醇单硬脂酸酯，升温至70-90℃搅拌均匀，依次加入三元乙丙橡胶、石蜡、甲基乙烯基环硅氧烷和油酸酰胺，升温至100-110℃，混合均匀后加入剩余原料，搅拌10-30min，搅拌后在190-210℃下挤出，吹塑成60-65μm厚的膜，在80℃下按纵向拉伸比2:1拉伸即可。
产品对大肠杆菌抗菌率99.4%，对金黄色葡萄球菌抗菌率99.3%；撕裂强度3.44N，拉伸强度14MPa；气孔隙率33%，纵向伸长率100%；水蒸气透过率4980g/（m2·24h）。
实施例
4:
按重量份数配比称取LLDPE100份，高岭土20份，碳酸钙58份，氢化聚异丁烯43份，乙二醇单硬脂酸酯35份，三元乙丙橡胶22份，石蜡6份，甲基乙烯基环硅氧烷18份，油酸酰胺4份，聚丁二烯12份，沸石0.06份，硫酸亚铁1.3份，绢云母30份，纳米磷酸锆载银抗菌剂2.5份，按重量份数配比称取LLDPE、高岭土、碳酸钙、氢化聚异丁烯和乙二醇单硬脂酸酯，升温至70-90℃搅拌均匀，依次加入三元乙丙橡胶、石蜡、甲基乙烯基环硅氧烷和油酸酰胺，升温至100-110℃，混合均匀后加入剩余原料，搅拌10-30min，搅拌后在190-210℃下挤出，吹塑成60-65μm厚的膜，在80℃下按纵向拉伸比2:1拉伸即可。
产品对大肠杆菌抗菌率99.6%，对金黄色葡萄球菌抗菌率99.4%；撕裂强度3.44N，拉伸强度14MPa；气孔隙率34%，纵向伸长率100%；水蒸气透过率5000g/（m2·24h）。
实施例
5:
按重量份数配比称取LLDPE100份，高岭土15份，碳酸钙55份，氢化聚异丁烯40份，乙二醇单硬脂酸酯30份，三元乙丙橡胶20份，石蜡5份，甲基乙烯基环硅氧烷15份，油酸酰胺3份，聚丁二烯10份，沸石0.05份，硫酸亚铁1份，绢云母25份，纳米磷酸锆载银抗菌剂2份，按重量份数配比称取LLDPE、高岭土、碳酸钙、氢化聚异丁烯和乙二醇单硬脂酸酯，升温至70-90℃搅拌均匀，依次加入三元乙丙橡胶、石蜡、甲基乙烯基环硅氧烷和油酸酰胺，升温至100-110℃，混合均匀后加入剩余原料，搅拌10-30min，搅拌后在190-210℃下挤出，吹塑成60-65μm厚的膜，在80℃下按纵向拉伸比2:1拉伸即可。
产品对大肠杆菌抗菌率99.8%，对金黄色葡萄球菌抗菌率99.5%；撕裂强度3.45N，拉伸强度15MPa；气孔隙率35%，纵向伸长率100%；水蒸气透过率5200g/（m2·24h）。
以上实施例中的所有组分均可以商业购买。
上述实施例只是用于对本发明的内容进行阐述，而不是限制，因此在和本发明的权利要求书相当的含义和范围内的任何改变，都应该认为是包括在权利要求书的范围内。
Claims (6)
1.一种透水蒸气聚乙烯膜，其特征在于，所述透水蒸气聚乙烯膜的原料按重量份数配比如下：LLDPE100份，高岭土5-25份，碳酸钙50-60份，氢化聚异丁烯35-45份，乙二醇单硬脂酸酯20-40份，三元乙丙橡胶15-25份，石蜡2-8份，甲基乙烯基环硅氧烷10-20份，油酸酰胺1-5份，聚丁二烯5-15份，异味消除剂0.03-0.07份，硫酸亚铁0.5-1.5份，绢云母15-35份，抗菌剂1-3份。
2.根据权利要求1所述的一种透水蒸气聚乙烯膜，其特征在于，所述透水蒸气聚乙烯膜的原料按重量份数配比如下：LLDPE100份，高岭土10-20份，碳酸钙52-58份，氢化聚异丁烯37-43份，乙二醇单硬脂酸酯25-35份，三元乙丙橡胶18-22份，石蜡4-6份，甲基乙烯基环硅氧烷13-18份，油酸酰胺2-4份，聚丁二烯8-12份，异味消除剂0.04-0.06份，硫酸亚铁0.7-1.3份，绢云母20-30份，抗菌剂1.5-2.5份。
3.根据权利要求1所述的一种透水蒸气聚乙烯膜，其特征在于，所述透水蒸气聚乙烯膜的原料按重量份数配比如下：LLDPE100份，高岭土15份，碳酸钙55份，氢化聚异丁烯40份，乙二醇单硬脂酸酯30份，三元乙丙橡胶20份，石蜡5份，甲基乙烯基环硅氧烷15份，油酸酰胺3份，聚丁二烯10份，异味消除剂0.05份，硫酸亚铁1份，绢云母25份，抗菌剂2份。
4.根据权利要求1所述的一种透水蒸气聚乙烯膜，其特征在于，所述异味消除剂采用沸石、乙酸甲酯或纳米二氧化钛。
5.根据权利要求1所述的一种透水蒸气聚乙烯膜，其特征在于：所述抗菌剂采用纳米磷酸锆载银抗菌剂。
6.一种权利要求1所述透水蒸气聚乙烯膜的制备方法，其特征在于，包括如下步骤：
第一步：按重量份数配比称取LLDPE、高岭土、碳酸钙、氢化聚异丁烯和乙二醇单硬脂酸酯，升温至70-90℃搅拌均匀；
第二步：依次加入三元乙丙橡胶、石蜡、甲基乙烯基环硅氧烷和油酸酰胺，升温至100-110℃，混合均匀后加入剩余原料，搅拌10-30min；
第三步：将第二步搅拌后的物料在190-210℃下挤出，吹塑成60-65μm厚的膜，在80℃下按纵向拉伸比2:1拉伸即可。
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| CN101100523A (zh) * | 2007-07-31 | 2008-01-09 | 广西塑料研究所 | 一种聚乙烯豆奶包装膜 |
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