CN108749232A - 一种用于模内转印的易成型聚酯薄膜及其制备方法 - Google Patents
一种用于模内转印的易成型聚酯薄膜及其制备方法 Download PDFInfo
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Abstract
本发明提供了一种用于模内转印的易成型聚酯薄膜，自上而下依次设置有防彩虹涂层、硬化涂层、上聚酯透明层、芯层及下聚酯透明层，所述上聚酯透明层、芯层及下聚酯透明层采用ABC三层共挤方式生产出基膜，上聚酯透明层、芯层与下聚酯透明层厚度比例大约为1.5：6.5：1.5，三层共挤基膜总厚度40‑50μm。本发明在硬化涂层上涂布防彩虹涂层，减少透明硬化处理时产生彩虹纹，而且提高印刷图案与薄膜的结合力，是一层特殊接着层，采用低分子量组分的共聚酯乳液，共聚酯浓度在10%‑30%之间，由于硬化涂层的折射率为1.52，因此不产生彩虹纹。
Description
技术领域
本发明涉及聚酯薄膜领域，尤其涉及一种用于模内转印的易成型聚酯薄膜。
背景技术
易成型聚酯薄膜，也称IMD薄膜，IMD是将已印刷成型好的装饰片材放入注塑模内，然后将树胶注射在成型片材的背面，使树脂与片材接合成一体固化成型的技术，IMD就是在注射成型的同时进行镶件加饰的技术，产品是和装饰承印材覆合成为一体，对立体状的成形品全体可进行加饰印刷，使产品达到装饰性与功能性于一身的效果。因此，IMD对易成型基膜提出了很高的要求，一般需要专门的涂层处理，目前国内需要专门进口易成型膜，市场需求量大而且迫切。
易成型聚酯薄膜要求在保留一般聚酯薄膜特性的同时，在高温领域的弹性系数大幅度降低，更易成型；在进行印刷和金属蒸镀时，色彩和光泽必须鲜明，要求适合家电、移动设备、汽车内外饰、建材、娱乐用品等IMD成型用途，因此首先要解决薄膜的弹性问题，对于高端客户，还应具备低彩虹的效果，减少透明硬化处理时产生彩虹纹，涂布防彩虹接着层应与硬化涂层的折射率相匹配，因此要解决的第二个问题就是彩虹纹影响装饰效果的问题。
发明内容
鉴于以上所述，有必要提供一种用于模内转印的易成型聚酯薄膜，起具备必要的硬度和低弹性，并有防彩虹效果。
本发明采用的技术方案如下：一种用于模内转印的易成型聚酯薄膜，包括防彩虹涂层、硬化涂层、上聚酯透明层、芯层及下聚酯透明层，所述硬化涂层设置在防彩虹涂层下方，所述上聚酯透明层设置在硬化涂层下方，所述芯层设置在上聚酯透明层下方，芯层为透明结构，所述下聚酯透明层设置在芯层下方。
进一步的，所述防彩虹涂层上方设置有一层离型保护膜，主要用于产品的保护，使用时剥离去掉，其厚度为23-50μm。
进一步的，所述防彩虹涂层的厚度为1-3μm。
进一步的，所述硬化涂层折射率为1.52，厚度为1-3μm。
进一步的，所述上聚酯透明层、芯层及下聚酯透明层采用ABC三层共挤方式生产出基膜，上聚酯透明层、芯层与下聚酯透明层厚度比例大约为1.5：6.5：1.5，三层共挤基膜总厚度40-50μm。
相较现有技术，本发明具有以下有益效果：
1、本发明采用水性共聚酯涂布配方和工艺，在线涂布硬化涂层，折射率为1.52左右；采用高分子量组分的共聚酯乳液，共聚酯浓度在10%-30%之间，硬化涂层可以降低薄膜的弹性，提高薄膜硬度。
2、在硬化涂层上涂布防彩虹涂层，减少透明硬化处理时产生彩虹纹，而且提高印刷图案与薄膜的结合力，是一层特殊接着层，采用低分子量组分的共聚酯乳液，共聚酯浓度在10%-30%之间，由于硬化涂层的折射率为1.52，因此不产生彩虹纹。
附图说明
图1是本发明所述用于模内转印的易成型聚酯薄膜的结构示意图。
具体实施方式
为详细说明本发明的技术内容、构造特征、所实现目的及效果，以下结合实施方式并配合附图详予说明。
如图1所示，一种用于模内转印的易成型聚酯薄膜，自上而下依次设置有防彩虹涂层1、硬化涂层2、上聚酯透明层3、芯层4及下聚酯透明层5，最上层为防彩虹涂层1，解决与印刷图案的结合力问题，同时有防彩虹效果，采用低分子量组分的共聚酯乳液，所述防彩虹涂层1的厚度为1-3μm；所述硬化涂层2设置在防彩虹涂层1下方，用于降低聚酯薄膜的弹性，采用高分子量组分的共聚酯乳液，所述硬化涂层2折射率为1.52，厚度为1-3μm；所述上聚酯透明层3设置在硬化涂层2下方，上聚酯透明层3采用透明聚酯切片母料，不添加二氧化硅摩擦剂；所述芯层4设置在上聚酯透明层3下方，芯层4为透明结构并采用中性聚酯母料，不添加二氧化硅摩擦剂，起到支撑作用；所述下聚酯透明层5设置在芯层4下方，下聚酯透明层5采用透明聚酯母料，添加二氧化硅摩擦剂，改善薄膜的收卷性能。
作为本发明的进一步改进，所述防彩虹涂层1上方设置有一层离型保护膜6，主要用于产品的保护，使用时剥离去掉，其厚度为23-50μm。
所述上聚酯透明层3、芯层4及下聚酯透明层5采用ABC三层共挤方式生产出基膜，再纵拉，在线涂布硬化涂层，经干燥、横拉、定型后成膜，随后离线涂布防彩虹涂层1，经干燥后收卷成为产品，上聚酯透明层3、芯层4与下聚酯透明层5厚度比例大约为1.5：6.5：1.5，三层共挤基膜总厚度40-50μm。
该易成型聚酯薄膜的制造方法如下：
1、配置硬化涂层涂液：硬化涂层高分子量共聚酯主剂与辅剂比例为8：2，其中共聚酯主剂为高分子量水性共聚酯，辅剂为消泡剂、流平剂、分散剂等助剂的组合，主剂+辅剂的总浓度10%-20%，去离子水占80-90%；主剂与辅剂比例为8：2，即主剂约占总浓度8%-16%，辅剂约占总浓度2%-4%；
2、将配置好的硬化涂层材料采用在线涂布的方法涂在ABC三层共挤基膜透明上表层上，烘干后成为硬化涂层，湿涂量10-20g/平方米；
3、在线涂布方式：采用D-bar涂布辊，狭缝喷头进行喷涂；
4、在纵拉之后、横拉之前进行在线涂布；
5、在线涂布后在横拉烘箱中烘干，其中烘干温度110℃，烘干时间大约30秒；
6、采用ABC三层共挤，上聚酯透明层（A层）采用透明的聚酯切片母料；芯层（B层）采用透明的聚酯切片中性料；下聚酯透明层（C层）采用了添加二氧化硅摩擦剂的聚酯切片母料，二氧化硅浓度10%以下，上聚酯透明层、芯层与下聚酯透明层厚度比例大约为1.5：6.5：1.5；
7、制备防彩虹涂层的涂液：防彩虹涂层低分子量共聚酯主剂与辅剂比例为8：2，总浓度10%-30%；其中共聚酯主剂为低分子量水性共聚酯，辅剂为辅剂为消泡剂、流平剂、分散剂等助剂的组合，主剂+辅剂的总浓度10%-30%，即去离子水占70-90%；主剂与辅剂比例为8：2，即主剂约占总浓度8%-24%，辅剂约占总浓度2%-6%；
8、将步骤7获得的材料涂在硬化涂层上面，湿涂量10-20g/平方米；
9、采用离线涂布方式，狭缝涂布方式，涂布后烘干温度110℃，烘干时间约40秒。
进一步的，步骤1中，所述消泡剂为非硅酮类水性消泡剂，约占总浓度0.5%-1%；流平剂为TEGO水性流平剂，约占总浓度0.5%-2%；分散剂为含锚固基团的水性分散剂，约占总浓度0.5%；稳定剂为硬脂酸镁类水性稳定剂，约占总浓度0.5%。
采用上述方式制造，该产品达到以下性能，与常规产品进行对比见附表：
附表：与常规产品对比表；
经试用观察，无彩虹纹产生。
以上所述仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。
Claims (6)
1.一种用于模内转印的易成型聚酯薄膜，其特征在于：包括防彩虹涂层、硬化涂层、上聚酯透明层、芯层及下聚酯透明层，所述硬化涂层设置在防彩虹涂层下方，所述上聚酯透明层设置在硬化涂层下方，所述芯层设置在上聚酯透明层下方，芯层为透明结构，所述下聚酯透明层设置在芯层下方，所述上聚酯透明层、芯层及下聚酯透明层采用ABC三层共挤方式生产出基膜，上聚酯透明层、芯层与下聚酯透明层厚度比例大约为1.5：6.5：1.5，三层共挤基膜总厚度40-50μm。
2.根据权利要求1所述的用于模内转印的易成型聚酯薄膜，其特征在于：所述防彩虹涂层上方设置有一层离型保护膜，其厚度为23-50μm。
3.根据权利要求1所述的用于模内转印的易成型聚酯薄膜，其特征在于：所述防彩虹涂层的厚度为1-3μm。
4.根据权利要求1所述的用于模内转印的易成型聚酯薄膜，其特征在于：所述硬化涂层折射率为1.52，厚度为1-3μm。
5.一种由1-4任意一项所述用于模内转印的易成型聚酯薄膜的制备方法，其特征在于，包括以下步骤：
（1）、配置硬化涂层涂液：硬化涂层高分子量共聚酯主剂与辅剂比例为8：2，其中共聚酯主剂为高分子量水性共聚酯，辅剂为消泡剂、流平剂、分散剂等助剂的组合，主剂+辅剂的总浓度10%-20%，去离子水占80-90%；主剂与辅剂比例为8：2，即主剂约占总浓度8%-16%，辅剂约占总浓度2%-4%；
（2）、将配置好的硬化涂层材料采用在线涂布的方法涂在ABC三层共挤基膜透明上表层上，烘干后成为硬化涂层，湿涂量10-20g/平方米；
（3）、在线涂布方式：采用D-bar涂布辊，狭缝喷头进行喷涂；
（4）、在纵拉之后、横拉之前进行在线涂布；
（5）、在线涂布后在横拉烘箱中烘干，其中烘干温度110℃，烘干时间大约30秒；
（6）、采用ABC三层共挤，上聚酯透明层（A层）采用透明的聚酯切片母料；芯层（B层）采用透明的聚酯切片中性料；下聚酯透明层（C层）采用了添加二氧化硅摩擦剂的聚酯切片母料，二氧化硅浓度10%以下，上聚酯透明层、芯层与下聚酯透明层厚度比例大约为1.5：6.5：1.5；
（7）、制备防彩虹涂层的涂液：防彩虹涂层低分子量共聚酯主剂与辅剂比例为8：2，总浓度10%-30%；其中共聚酯主剂为低分子量水性共聚酯，辅剂为辅剂为消泡剂、流平剂、分散剂等助剂的组合，主剂+辅剂的总浓度10%-30%，即去离子水占70-90%；主剂与辅剂比例为8：2，即主剂约占总浓度8%-24%，辅剂约占总浓度2%-6%；
（8）、将步骤7获得的材料涂在硬化涂层上面，湿涂量10-20g/平方米；
（9）、采用离线涂布方式，狭缝涂布方式，涂布后烘干温度110℃，烘干时间约40秒。
6.根据权利要求5所述的用于模内转印的易成型聚酯薄膜，其特征在于：，步骤（1）中，所述消泡剂为非硅酮类水性消泡剂，约占总浓度0.5%-1%；流平剂为TEGO水性流平剂，约占总浓度0.5%-2%；分散剂为含锚固基团的水性分散剂，约占总浓度0.5%；稳定剂为硬脂酸镁类水性稳定剂，约占总浓度0.5%。
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