CN112936899B - 一种多功能高雾面转移薄膜的生产方法 - Google Patents
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Abstract
本发明公开了一种多功能高雾面转移薄膜的生产方法,薄膜由上表层、次表层、中间层和下表层组成,下表层为抗粘层,上表层和次表层均为转移层,转移层由高雾度消光转移母料、抗静电剂、爽滑剂、抗粘连剂组成,中间层由均聚聚丙烯和抗静电剂组成,下表层由均聚聚丙烯和抗粘连剂组成,其特征在于:高雾度消光母料由以下组分按重量百分比组成,二元共聚聚丙烯45‑50%,高密度聚乙烯45‑50%,抗氧剂0.3‑0.5%,线性低密度聚乙烯4.5‑8.0%。本发明生产的高雾面转移薄膜利用膜面哑度将承载材料进行转印,从而达到承印物表面的哑度。
Description
技术领域
本发明涉及一种薄膜,具体讲是一种多功能高雾面转移薄膜的生产方法。
背景技术
转移膜是一中间载体,存在于转移纸基或塑基之上,承载被印刷或者打印的图案,是用于转印到被印制的物品之上的一层化学弹性膜,转移膜被广泛用于广告,装饰,皮革,纺织等领域
目前市场上的多功能BOPP转移膜大多数为光膜型转移膜,但近年来,越来越多的产品要求呈现哑光效果,以降低图案的光泽度;现在技术主要采用光膜型转移基膜转印后再涂布消光剂来达到消光效果。
为了解决上述问题,申请号为CN201910736503.8的专利公开了一种高雾度BOPP消光转移膜及其制备方法,该专利设计四层膜结构,上表层为抗粘黏层,上芯层为聚丙烯层,下芯层和下表层均为转移层;抗粘黏层防止薄膜粘连,聚丙烯层维持薄膜生产的稳定性,转移层选用新型的高雾度消光转移母料,可以良好的保证薄膜的雾度,并用抗粘连剂提高薄膜表面粗糙度。然而,虽然上述技术方案所公开的高雾度BOPP消光转移膜能够在一定程度上提高薄膜的雾度,但是还有待提高。
发明内容
鉴于上述现有技术的缺陷,本发明的目的在于:提供一种多功能高雾面转移薄膜的生产方法。
为解决上述问题,本发明的技术解决方案是:一种多功能高雾面转移薄膜的生产方法,薄膜由上表层、次表层、中间层和下表层组成,下表层为抗粘层,上表层和次表层均为转移层,转移层由高雾度消光转移母料、抗静电剂、爽滑剂、抗粘连剂组成,中间层由均聚聚丙烯和抗静电剂组成,下表层由均聚聚丙烯和抗粘连剂组成,高雾度消光母料由以下组分按重量百分比组成,二元共聚聚丙烯45-50%,高密度聚乙烯45-50%,抗氧剂0.3-0.5%,线性低密度聚乙烯4.5-8.0%;
生产方法包括以下步骤:
(1)将二元共聚聚丙烯,高密度聚乙烯,抗氧剂,线性低密度聚乙烯共混,在双螺杆挤出机内熔融挤出,拉条冷却后切粒,制得高雾度消光母料;
(2)按上表层、次表层、中间层和下表层比例分别称取原料,混配后的原料均进行干燥;
(2)干燥后的上表层、次表层、中间层和下表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并经过水浴冷却后将片材定型形成铸片,水浴温度为80-85℃;
(5)铸片再分别经过纵拉机和横向拉伸机,纵拉温度为120-123℃,横拉温度为160-164℃,纵向拉伸比为2.5-3,横向拉伸比为9-9.5,将片材拉制成薄膜;
(6)将薄膜表面进行电晕处理;
(7)薄膜再经过牵引机并进行测厚后送入收卷机,卷成大膜卷;
(8)大膜卷经过时效处理后再分切成成品。
进一步地,抗静电剂为硬酯酸甘油酯和油酸酰胺的混合物,爽滑剂为芥酸酰胺,抗粘连为二氧化硅。
进一步地,高雾度消光转移母料的熔融指数在230℃/2.16kg条件下为2.0-3.5g/10min。
进一步地,步骤(1)中,双螺杆挤出机的给料段、压缩段、熔融段、计量段、机头、口模的温度分别为230℃、225℃、220℃、210℃、200℃、190℃。
本发明的有益效果是:
1、能够达到承印物表面的哑度;
2、高雾度消光母料由以下组分按重量百分比组成,二元共聚聚丙烯45-50%,高密度聚乙烯45-50%,抗氧剂0.3-0.5%,线性低密度聚乙烯4.5-8.0%,通过大幅度增加高密度聚乙烯的占比能够起到增加拉伸强度和冲击强度的作用;
3、用气刀将片材贴附于激冷辊上并经过水浴冷却后将片材定型形成铸片,水浴温度为85℃,将水浴温度由现有的35-40℃提高到80-85℃后,薄膜的上表面能够在这个温度下被粗化,使得薄膜表面粗糙度明显增大,因为薄膜表面织态结构影响雾度性能,所以能增加薄膜的雾度;
4、纵拉温度为120-123℃,横拉温度为160-164℃,纵向拉伸比为2.5-3,横向拉伸比为9-9.5,相比于现有技术,通过适当降低纵拉、横拉的温度,以及降低纵向拉伸比、横向拉伸比后,可以明显增加薄膜的雾度;
5、薄膜表面进行电晕处理,能诱发薄膜表面分子的化学键断裂而降解,增大表面粗糙度,增加了薄膜的雾度。
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:
一种多功能高雾面转移薄膜的生产方法,薄膜由上表层、次表层、中间层和下表层组成,下表层为抗粘层,上表层和次表层均为转移层,转移层由以下组分按重量百分比组成:高雾度消光转移母料80%,抗静电剂8.0%,爽滑剂6.0%,抗粘连剂6.0%,高雾度消光母料由以下组分按重量百分比组成:二元共聚聚丙烯50%,高密度聚乙烯45%,抗氧剂0.5%,线性低密度聚乙烯4.5%;中间层由以下组分按重量百分比组成:均聚聚丙烯99%,抗静电剂1%;下表层由以下组分按重量百分比组成:均聚聚丙烯98.5%,抗粘连剂1.5%;
生产方法包括以下步骤:
(1)将二元共聚聚丙烯,高密度聚乙烯,抗氧剂,线性低密度聚乙烯共混,在双螺杆挤出机内熔融挤出,双螺杆挤出机的给料段、压缩段、熔融段、计量段、机头、口模的温度分别为230℃、225℃、220℃、210℃、200℃、190℃,拉条冷却后切粒,制得高雾度消光母料;
(2)按上表层、次表层、中间层和下表层比例分别称取原料,混配后的原料均进行干燥;
(2)干燥后的上表层、次表层、中间层和下表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并经过水浴冷却后将片材定型形成铸片,水浴温度为85℃;
(5)铸片再分别经过纵拉机和横向拉伸机,纵拉温度为120℃,横拉温度为160℃,纵向拉伸比为2.5,横向拉伸比为9,将片材拉制成薄膜;
(6)将薄膜表面进行电晕处理;
(7)薄膜再经过牵引机并进行测厚后送入收卷机,卷成大膜卷;
(8)大膜卷经过时效处理后再分切成成品。
抗静电剂为硬酯酸甘油酯和油酸酰胺的混合物,爽滑剂为芥酸酰胺,抗粘连为二氧化硅。
高雾度消光转移母料的熔融指数在230℃/2.16kg条件下为2.0g/10min。
实施例二:实施例二与实施例一的区别在于:
雾度消光母料由以下组分按重量百分比组成:二元共聚聚丙烯45%,高密度聚乙烯50%,抗氧剂0.3%,线性低密度聚乙烯4.7%;
水浴温度为80℃;
铸片再分别经过纵拉机和横向拉伸机,纵拉温度为123℃,横拉温度为164℃,纵向拉伸比为3,横向拉伸比为9.5,将片材拉制成薄膜;
高雾度消光转移母料的熔融指数在230℃/2.16kg条件下为3.5g/10min。
实施例三:实施例三与实施例一的区别在于:
雾度消光母料由以下组分按重量百分比组成:二元共聚聚丙烯45%,高密度聚乙烯46.5%,抗氧剂0.5%,线性低密度聚乙烯8%;
水浴温度为82℃;
铸片再分别经过纵拉机和横向拉伸机,纵拉温度为122℃,横拉温度为162-164℃,纵向拉伸比为2.7,横向拉伸比为9.3,将片材拉制成薄膜;
高雾度消光转移母料的熔融指数在230℃/2.16kg条件下为3g/10min。
对比例一:对比例一为现有技术的高雾度转移膜,对比例一与实施例一的区别在于:高雾度消光母料由以下组分按重量百分比组成:二元共聚物聚丙烯70%、高密度聚乙烯20%、抗氧剂10100.1%、线性低密度聚乙烯9.9%;中间层由以下组分按重量百分比组成:抗静电剂硬酯酸甘油酯0.5%、爽滑剂乙撑双硬酯酰胺0.5%、薄膜级均聚聚丙烯99%;下表层由以下组分按重量百分比组成:共聚聚丙烯95%、抗粘黏母料5%;
爽滑剂为乙撑双硬酯酰胺,抗粘连剂为玻璃微珠;
铸片水浴温度为35℃;
纵拉温度为124℃,横拉温度为165℃,纵向拉伸比为4.9,横向拉伸比为10;
薄膜未经电晕处理。
对比例二:对比例二与实施例一的区别在于:水浴温度为35℃;
对比例三:对比例三与实施例一的区别在于:纵拉温度为124℃,横拉温度为165℃,纵向拉伸比为4.9,横向拉伸比为10。
对比例四:对比例四与实施例一的区别在于:薄膜未经电晕处理。
为验证本发明的效果,将上述实施例一至三以及对比例一至四制得的试样进行对比试验,检测结果如下表所示:
检测项目 | 实施例一 | 实施例二 | 实施例三 | 对比例一 | 对比例二 | 对比例三 | 对比例四 |
雾度/% | 84 | 83 | 83 | 76 | 81 | 81 | 82 |
从上表可以看出,本发明生产的多功能高雾面转移薄膜,雾度效果有了明显地提升。
Claims (4)
1.一种多功能高雾面转移薄膜的生产方法,薄膜由上表层、次表层、中间层和下表层组成,下表层为抗粘层,上表层和次表层均为转移层,转移层由高雾度消光转移母料、抗静电剂、爽滑剂、抗粘连剂组成,中间层由均聚聚丙烯和抗静电剂组成,下表层由均聚聚丙烯和抗粘连剂组成,其特征在于:高雾度消光母料由以下组分按重量百分比组成,二元共聚聚丙烯45-50%,高密度聚乙烯45-50%,抗氧剂0.3-0.5%,线性低密度聚乙烯4.5-8.0%;
生产方法包括以下步骤:
(1)将二元共聚聚丙烯,高密度聚乙烯,抗氧剂,线性低密度聚乙烯共混,在双螺杆挤出机内熔融挤出,拉条冷却后切粒,制得高雾度消光母料;
(2)按上表层、次表层、中间层和下表层比例分别称取原料,混配后的原料均进行干燥;
(2)干燥后的上表层、次表层、中间层和下表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并经过水浴冷却后将片材定型形成铸片,水浴温度为80-85℃;
(5)铸片再分别经过纵拉机和横向拉伸机,纵拉温度为120-123℃,横拉温度为160-164℃,纵向拉伸比为2.5-3,横向拉伸比为9-9.5,将片材拉制成薄膜;
(6)将薄膜表面进行电晕处理;
(7)薄膜再经过牵引机并进行测厚后送入收卷机,卷成大膜卷;
(8)大膜卷经过时效处理后再分切成成品。
2.根据权利要求1所述的一种多功能高雾面转移薄膜的生产方法,其特征在于:抗静电剂为硬酯酸甘油酯和油酸酰胺的混合物,爽滑剂为芥酸酰胺,抗粘连为二氧化硅。
3.根据权利要求1所述的一种多功能高雾面转移薄膜的生产方法,其特征在于:高雾度消光转移母料的熔融指数在230℃/2.16kg条件下为2.0-3.5g/10min。
4.根据权利要求1所述的一种多功能高雾面转移薄膜的生产方法,其特征在于:步骤(1)中,双螺杆挤出机的给料段、压缩段、熔融段、计量段、机头、口模的温度分别为230℃、225℃、220℃、210℃、200℃、190℃。
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