CN113978079A - 耐温防剥离薄膜及其生产方法 - Google Patents

耐温防剥离薄膜及其生产方法 Download PDF

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CN113978079A
CN113978079A CN202111132773.1A CN202111132773A CN113978079A CN 113978079 A CN113978079 A CN 113978079A CN 202111132773 A CN202111132773 A CN 202111132773A CN 113978079 A CN113978079 A CN 113978079A
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polypropylene
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邵峥
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Ningbo Ruicheng Packing Material Co ltd
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Abstract

本发明公开了一种耐温防剥离薄膜，它由电晕层、中间层、热封层组成，电晕层由共聚聚丙烯、甲基丙烯酸甲酯共聚物、成核剂、PET、PP‑g‑AA组成；中间层由均聚聚丙烯、PP‑g‑MAH、PA66、共聚聚丙烯、碳酸钙、钛酸酯偶联剂、HDPE、液体石蜡、EPDM组成；热封层由共聚聚丙烯、PBT、润滑剂、E‑EA‑GMA组成。本发明通过在电晕层添加甲基丙烯酸甲酯共聚物做改性，增加表面极性达到铝层防剥离的目的，从而提高镀铝后金属铝的附着力；而且，薄膜还具有塑性好、韧性好灯优点。

Description

耐温防剥离薄膜及其生产方法
技术领域
本发明涉及一种耐温防剥离薄膜及其生产方法。
背景技术
镀铝膜是采用特殊工艺在塑料薄膜表面上附着一层极薄的金属铝而形成的一种复合塑料包装材料，通过附着金属铝达到阻水蒸气,阻氧的特性，以CPP基材料水蒸气透过率举例；未镀铝时的透过率：10～25g/m2.24h.40℃,镀铝后的透过率：1.0～1.5g/m2.24h.40℃。良好的阻水蒸气，阻氧性被广泛用于膨化食品、饼干、茶叶等食品包装中。传统的镀铝膜一般适合干式复合，无溶剂复合，其复合温度低对镀铝层的破坏极低，能保证最终产品的复合牢度。
挤出复合是将热塑性材料，如PP、PE等，在挤出机内熔融后，通过平模头将片状热融薄膜作为粘合剂，再将一种或者两种基材挤压复合在一起。其特点是溶剂无残留，经济环保。但是挤出复合工艺却不适合用于镀铝膜的复合，因为挤出复合产生的高温对金属铝的附着造成破坏，导致最终的产品复合牢度降低。
发明内容
鉴于上述现有技术的缺陷，本发明的一个目的在于：提供一种耐温防剥离薄膜，能够用于金属化镀铝。
为解决上述问题，本发明的技术解决方案是：耐温防剥离薄膜，它由电晕层、中间层、热封层组成，其中：
电晕层由共聚聚丙烯、甲基丙烯酸甲酯共聚物、成核剂、PET、PP-g-AA组成；
中间层由均聚聚丙烯、PP-g-MAH、PA66、共聚聚丙烯、碳酸钙、钛酸酯偶联剂、HDPE、液体石蜡、EPDM组成；
热封层由共聚聚丙烯、PBT、润滑剂、E-EA-GMA组成。
进一步地，电晕层、中间层、热封层的组分按质量比为：电晕层20％，中间层60％，热封层20％。
进一步地，电晕层的组分按质量比为：共聚聚丙烯74％、甲基丙烯酸甲酯共聚物10％，成核剂0.5％、PET 12％、PP-g-AA 3.5％。
进一步地，中间层的组分按质量比为：均聚聚丙烯30％、PP-g-MAH 4％、PA668％、共聚聚丙烯20％、碳酸钙15％、钛酸酯偶联剂0.5％、HDPE 12％、液体石蜡0.5％、EPDM10％。
进一步地，热封层的组分按质量比为：共聚聚丙烯80％、PBT 16％、润滑剂0.5％、E-EA-GMA 3.5％。
本发明还提供一种上述耐温防剥离薄膜的生产方法包括以下步骤：
(1)按电晕层、中间层、热封层各组分比例分别称取原料，电晕层、中间层、热封层原料分别单独进行混配，混配后的原料均进行干燥；
(2)干燥后的电晕层、中间层、热封层原料分别送入各自挤出机进行熔融混炼塑化；
(3)分别将熔融态熔体送入模头，熔体在模头中汇合后通过扁平状的模头口形成熔融态片材；
(4)用气刀将片材贴附于激冷辊上骤冷形成未定型的晶型结构，激冷辊温度为20-35℃，然后经过水浴冷却后将片材定型形成铸片；
(5)铸片经拉伸后形成薄膜；
(6)薄膜通过红外线检测厚度将对应厚度偏差反馈到模头，通过对应位置螺栓加热功率微动，对薄膜厚度偏差进行修正；
(7)电晕面进行高频高压火花处理，诱发其表面化学键断裂并发生交联，提高产品的表面张力；
(8)将电晕处理后的产品进行冷却并收卷。
进一步地，中间层的原料进行混配时包括以下步骤
(A)将碳酸钙在110℃下干燥4h，然后加入高速混炼机中混合1min，然后加入钛酸酯偶联剂和液体石蜡低速混合3min，进行表面活化处理，然后将共聚聚丙烯、HDPE、EPDM及经表面活化处理的碳酸钙混合搅拌均匀，混合搅拌温度为100～105℃，时间为5min；
(B)将均聚聚丙烯、PP-g-MAH、PA66在高速混合机中混合搅拌，混合温度80-100℃，搅拌时间10min；
(C)将步骤(A)、步骤(B)的原料共混。
本发明的有益效果是：
通过在电晕层添加甲基丙烯酸甲酯共聚物做改性，增加表面极性达到铝层防剥离的目的，从而提高镀铝后金属铝的附着力，在挤出复合工艺中可以耐相对较高的温度；而且，电晕层还通过共聚聚丙烯、PET共混改性，共聚聚丙烯、PET共混，既可以改善PET的缺点，又可以提高共聚聚丙烯的冲击强度和力学性能，薄膜的拉伸强度和弯曲强度较好；
中间层不但通过均聚聚丙烯、PA66共混改性，使薄膜在常温及低温下缺口冲击强度有较大提高，还通过共聚聚丙烯、HDPE、EPDM共混改性，薄膜具有较高的塑性和韧性保持率；
热封层通过共聚聚丙烯、PBT共混改性，可提高薄膜的拉伸强度、弯曲强度和冲击强度。
具体实施方式
为比较直观、完整地理解本发明的技术方案，现进行非限制性的特征说明如下：
实施例一：
耐温防剥离薄膜，它由电晕层、中间层、热封层组成，其中：
电晕层由共聚聚丙烯、甲基丙烯酸甲酯共聚物、成核剂、PET、PP-g-AA组成，成核剂为磷酸钠；
中间层由均聚聚丙烯、PP-g-MAH、PA66、共聚聚丙烯、碳酸钙、钛酸酯偶联剂、HDPE、液体石蜡、EPDM组成；
热封层由共聚聚丙烯、PBT、润滑剂、E-EA-GMA组成，润滑剂为润滑剂Hst。
电晕层、中间层、热封层的组分按质量比为：电晕层20％，中间层60％，热封层20％。
电晕层的组分按质量比为：共聚聚丙烯74％、甲基丙烯酸甲酯共聚物10％，成核剂0.5％、PET 12％、PP-g-AA 3.5％。
中间层的组分按质量比为：均聚聚丙烯30％、PP-g-MAH 4％、PA668％、共聚聚丙烯20％、碳酸钙15％、钛酸酯偶联剂0.5％、HDPE 12％、液体石蜡0.5％、EPDM 10％。
热封层的组分按质量比为：共聚聚丙烯80％、PBT 16％、润滑剂0.5％、E-EA-GMA3.5％。
上述耐温防剥离薄膜的生产方法包括以下步骤：
(1)按电晕层、中间层、热封层各组分比例分别称取原料，电晕层、中间层、热封层原料分别单独进行混配，混配后的原料均进行干燥；
(2)干燥后的电晕层、中间层、热封层原料分别送入各自挤出机进行熔融混炼塑化；
(3)分别将熔融态熔体送入模头，熔体在模头中汇合后通过扁平状的模头口形成熔融态片材；
(4)用气刀将片材贴附于激冷辊上骤冷形成未定型的晶型结构，激冷辊温度为30℃，然后经过水浴冷却后将片材定型形成铸片；
(5)铸片经拉伸后形成薄膜；
(6)薄膜通过红外线检测厚度将对应厚度偏差反馈到模头，通过对应位置螺栓加热功率微动，对薄膜厚度偏差进行修正；
(7)电晕面进行高频高压火花处理，诱发其表面化学键断裂并发生交联，提高产品的表面张力；
(8)将电晕处理后的产品进行冷却并收卷。
进一步地，中间层的原料进行混配时包括以下步骤
(A)将碳酸钙在110℃下干燥4h，然后加入高速混炼机中混合1min，然后加入钛酸酯偶联剂和液体石蜡低速混合3min，进行表面活化处理，然后将共聚聚丙烯、HDPE、EPDM及经表面活化处理的碳酸钙混合搅拌均匀，混合搅拌温度为100℃，时间为5min，活化处理的目的在于增加无机填料碳酸钙与共聚聚丙烯之间的混溶性；
(B)将均聚聚丙烯、PP-g-MAH、PA66在高速混合机中混合搅拌，混合温度100℃，搅拌时间10min；
(C)将步骤(A)、步骤(B)的原料共混。

Claims (7)

1.耐温防剥离薄膜，其特征在于：它由电晕层、中间层、热封层组成，其中：
电晕层由共聚聚丙烯、甲基丙烯酸甲酯共聚物、成核剂、PET、PP-g-AA组成；
中间层由均聚聚丙烯、PP-g-MAH、PA66、共聚聚丙烯、碳酸钙、钛酸酯偶联剂、HDPE、液体石蜡、EPDM组成；
热封层由共聚聚丙烯、PBT、润滑剂、E-EA-GMA组成。
2.根据权利要求1所述的耐温防剥离薄膜，其特征在于：电晕层、中间层、热封层的组分按质量比为：电晕层20％，中间层60％，热封层20％。
3.根据权利要求1所述的耐温防剥离薄膜，其特征在于：电晕层的组分按质量比为：共聚聚丙烯74％、甲基丙烯酸甲酯共聚物10％，成核剂0.5％、PET 12％、PP-g-AA 3.5％。
4.根据权利要求1所述的耐温防剥离薄膜，其特征在于：中间层的组分按质量比为：均聚聚丙烯30％、PP-g-MAH 4％、PA668％、共聚聚丙烯20％、碳酸钙15％、钛酸酯偶联剂0.5％、HDPE 12％、液体石蜡0.5％、EPDM 10％。
5.根据权利要求1所述的耐温防剥离薄膜，其特征在于：热封层的组分按质量比为：共聚聚丙烯80％、PBT 16％、润滑剂0.5％、E-EA-GMA 3.5％。
6.根据权利要求1所述的耐温防剥离薄膜的生产方法，其特征在于包括以下步骤：
(1)按电晕层、中间层、热封层各组分比例分别称取原料，电晕层、中间层、热封层原料分别单独进行混配，混配后的原料均进行干燥；
(2)干燥后的电晕层、中间层、热封层原料分别送入各自挤出机进行熔融混炼塑化；
(3)分别将熔融态熔体送入模头，熔体在模头中汇合后通过扁平状的模头口形成熔融态片材；
(4)用气刀将片材贴附于激冷辊上骤冷形成未定型的晶型结构，激冷辊温度为20-35℃，然后经过水浴冷却后将片材定型形成铸片；
(5)铸片经拉伸后形成薄膜；
(6)薄膜通过红外线检测厚度将对应厚度偏差反馈到模头，通过对应位置螺栓加热功率微动，对薄膜厚度偏差进行修正；
(7)电晕面进行高频高压火花处理，诱发其表面化学键断裂并发生交联，提高产品的表面张力；
(8)将电晕处理后的产品进行冷却并收卷。
7.根据权利要求6所述的耐温防剥离薄膜的生产方法，其特征在于：中间层的原料进行混配时包括以下步骤
(A)将碳酸钙在110℃下干燥4h，然后加入高速混炼机中混合1min，然后加入钛酸酯偶联剂和液体石蜡低速混合3min，进行表面活化处理，然后将共聚聚丙烯、HDPE、EPDM、及经表面活化处理的碳酸钙混合搅拌均匀，混合搅拌温度为100～105℃，时间为5min；
(B)将均聚聚丙烯、PP-g-MAH、PA66在高速混合机中混合搅拌，混合温度80-100℃，搅拌时间10min；
(C)将步骤(A)、步骤(B)的原料共混。
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