CN111171471B - 一种pvc装饰膜及pvc膜的生产工艺 - Google Patents
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Abstract
本发明公开了一种PVC装饰膜,包括PVC膜层和与PVC膜层接触的蒸镀金属膜层;所述PVC膜层包含以下重量份的组分:PVC树脂100份、增韧剂3~7份、热稳定剂0.5~3份、ACR树脂1~3份和润滑剂0.2~1份。本发明所述装饰膜选用PVC膜层作为塑料膜层,成本较低,且通过对PVC的配方进行优选,使其制备的PVC膜层具有较好的结合力和使用寿命,制得的装饰膜的外观较亮,光泽度较高。本发明还公开了所述PVC膜的生产工艺,采用在90~110℃排料处理、低温引取和升温冷却的生产工艺,可实现高透明度和高光泽度PVC膜的制备。
Description
技术领域
本发明涉及一种装饰膜,具体涉及一种PVC装饰膜及PVC膜的生产工艺。
背景技术
金属外观的装饰膜应用领域广泛,如电冰箱、洗衣机等家用电器,以及车窗等,均可以使其具有金属的外观,一般采用在塑料膜层上蒸镀形成金属层制备而成。塑料膜层的外观和品质直接影响装饰膜的外观和品质,比如塑料膜层的光泽度不够,则直接影响制成的装饰膜的光泽度。塑料膜层的表面光滑度还会影响其与蒸镀金属膜层的结合力,结合力差,蒸镀金属膜层附着力不够,导致其容易褪色,耐久性差。另外,塑料膜层的耐老化耐黄变能力也极大影响了装饰膜层的使用寿命。
发明内容
本发明的目的在于克服现有技术存在的不足之处而提供一种PVC装饰膜及PVC膜的生产工艺。
为实现上述目的,本发明采取的技术方案为:一种PVC装饰膜,包括PVC膜层和与PVC膜层接触的蒸镀金属膜层;
所述PVC膜层包含以下重量份的组分:PVC树脂100份、增韧剂3~7份、热稳定剂0.5~3份、ACR树脂1~3份和润滑剂0.2~1份。
本发明所述装饰膜选用PVC膜层作为塑料膜层,成本较低,且通过对PVC的配方进行优选,使其制备的PVC膜层具有较好的结合力和使用寿命,制得的装饰膜的外观较亮,光泽度较高。
优选地,所述热稳定剂为硫醇甲基锡。本发明所述PVC的热稳定剂选用硫醇甲基锡,可以防止PVC黄变。
优选地,所述润滑剂为多官能基脂肪酸酯、脂肪酸酰胺、有机复合盐类和聚乙烯蜡中的至少一种。更优选地,所述润滑剂为多官能基脂肪酸酯和有机复合盐类的混合物。
优选地,所述多官能基脂肪酸酯为0.15~0.25份,所述有机复合盐类为0.1~0.2份。内润滑剂和外润滑剂的种类和添加量直接影响后续金属膜层的蒸镀效果和使用寿命,外润滑剂主要是析出用来防止压延时辊和膜粘连,添加量过多,析出过多则不利于压延工艺,并且电镀后的电镀层与PVC膜的粘附力差,容易脱落,电镀后性能差。内润滑剂可以改善产品的塑化效果,一定程度上可减少发生黄变老化的几率。采用上述配比的润滑剂配合,可以防止老化并获得的PVC膜层的光泽度较好,遮蔽率更低,金属膜层和PVC膜层的附着力强,使用寿命长。
优选地,所述增韧剂为MBS。
优选地,所述金属膜层为铝膜。
本发明的目的在于提供一种上述所述PVC装饰膜用PVC膜的生产工艺,包括以下步骤:
(1)将PVC原料混合,升温至90~110℃,经螺杆挤出机挤出;
(2)压延成型;
(3)引取,第一段引取的温度为55℃~70℃;
(4)压花,然后升温至50~60℃,冷却,卷取,即得所述PVC膜。
与传统的PVC薄膜生产工艺不同,本发明所述PVC膜对光泽度、透明度和拉伸强度等性能要求较高,因此本发明所述PVC膜的生产工艺在引取段通过采用低温(55℃~70℃)引取的工艺,可以使获得的PVC膜的透明度更好,光泽度值可达135以上,且能控制较低的热收缩率,更利于后段加工成型。另外,所述PVC膜在压花后升温至50~60℃后再进行冷却,若初始冷却温度过高,冷却定型不好,温度过低,表面易起皱,从该温度开始冷却,可以减少PVC表面起皱现象的发生,实现良好的定型,有利于PVC膜层后续的蒸镀金属膜层的实施。再者,将PVC原料混合升温至90~110℃后排料处理,可以避免因混合温度过高物料过渡塑化易产生焦料点,颜色发黄,温度过低物料塑化不良,产品光泽度、透明度、拉伸强度则不佳的发生。
优选地,所述冷却为四阶段冷却,冷却温度依次为53~58℃、48~53℃、42~48℃和35~42℃。采用上述多阶段冷却,可以实现PVC膜层的冷却定型更好的表面光泽度。
优选地,所述压花的温度为20±2℃;所述螺杆挤出机中,一区温度为175~190℃,二区温度为140~155℃,三区温度为160~170℃。
优选地,所述压延为五辊压延:1#辊温度为185~195℃,线速度为7~10m/min,2#辊温度为185~195℃,线速度为9~12m/min,3#辊温度为190~200℃,线速度为11~14m/min,4#辊温度为200~210℃,线速度为13~16m/min,5#辊温度为190~205℃,线速度为15~18m/min。
本发明的有益效果在于:本发明提供了一种PVC装饰膜。本发明所述装饰膜选用PVC膜层作为塑料膜层,成本较低,且通过对PVC的配方进行优选,使其制备的PVC膜层具有较好的结合力和使用寿命,制得的装饰膜的外观较亮,光泽度较高。本发明还提供了所述PVC膜的生产工艺,采用在90~110℃排料处理、低温引取和升温冷却的生产工艺,可实现高透明度和高光泽度PVC膜的制备。
具体实施方式
为更好的说明本发明的目的、技术方案和优点,下面将结合具体实施例对本发明作进一步说明。
实施例和对比例中,各原料来源如下:PVC树脂购自创菱(广州)贸易有限公司,产品型号为TG-800;MBS购自江西岳峰高分子材料有限公司,产品型号为MB-530;硫醇甲基锡购自湖北鑫润德化工有限公司;ACR树脂购自山东日科化学有限公司,产品型号为401;多官能基脂肪酸酯购自厦门联合化学有限公司,产品型号为G70S;有机复合盐类购自厦门联合化学有限公司,产品型号为925。
实施例1~7和对比例1~2所述PVC装饰膜包括PVC膜层和与PVC膜层接触的蒸镀铝膜层;所述PVC膜层的配方见表1。
表1
实施例1~7和对比例1~2所述PVC膜的制备方法包括以下步骤:
(1)将PVC原料在混合机中混合,经螺杆挤出机挤出至轧轮机混炼;
(2)由输送皮带至主机压延成型;
(3)在引取轮组的作用下进入压花轮、橡胶轮、温练轮、预冷轮和冷却轮,经电晕机和S牵引轮处理,得所述PVC膜。
各辊轮温度和参数见表2和表3。
表2
表3
对比例3
本对比例与实施例1所述PVC膜的配方相同,生产工艺的不同之处在于温练轮后,进入预冷轮之前,温度快速下降至40℃。
对比例4
本对比例与实施例1所述PVC膜的配方相同,生产工艺的不同之处在于引取轮组温度不同,引取轮组温度为135~160℃。
实施例8
实施例1~7和对比例1~4制得的薄膜厚度为0.05~0.07mm,测试实施例1~7和对比例1~4所述PVC薄膜的性能,测试方法为:
1.光泽度测试:测试方法依据GB/T 8807
2.热收缩测试:测试方法依据GB/T 12027
3.镀铝层附着力测试:测试方法依据ASTM D 3359
测试结果见表4。
表4
对于PVC装饰膜而言,光泽度大于135能使制得的装饰膜的外观较亮,能满足用户的需求,纵向热收缩率控制在10%以内,更有利于后续加工成型,附着力评定为4B级以上时满足金属镀层与PVC膜层的良好结合。实施例1~7所述具有较好的光泽度和较低的收缩率及较高的附着力。
最后所应当说明的是,以上实施例仅用以说明本发明的技术方案而非对本发明保护范围的限制,尽管参照较佳实施例对本发明作了详细说明,本领域的普通技术人员应当理解,可以对本发明的技术方案进行修改或者等同替换,而不脱离本发明技术方案的实质和范围。
Claims (6)
1.一种PVC装饰膜,其特征在于,包括PVC膜层和与PVC膜层接触的蒸镀金属膜层;所述PVC膜层包含以下重量份的组分:PVC树脂100份、增韧剂 3~7份、热稳定剂0.5~3份、ACR树脂1~3份和润滑剂0.2~1份;
其中,所述热稳定剂为硫醇甲基锡;所述润滑剂为多官能基脂肪酸酯和有机复合盐类的混合物;所述多官能基脂肪酸酯为0.15~0.25份,所述有机复合盐类为0.1~0.2份;
其中,所述PVC装饰膜用PVC膜的生产工艺,包括以下步骤:
(1)将PVC原料混合,升温至90~110℃,经螺杆挤出机挤出;
(2)压延成型;
(3)引取,第一段引取的温度为55~70℃;
(4)压花,然后升温至50~60℃,四阶段冷却,卷取,即得所述PVC膜。
2.如权利要求1所述PVC装饰膜,其特征在于,所述增韧剂为MBS。
3.如权利要求1所述PVC装饰膜,其特征在于,所述金属膜层为铝膜。
4.如权利要求1所述PVC装饰膜的生产工艺,其特征在于,所述冷却为四阶段冷却,冷却温度依次为53~58℃、48~53℃、42~48℃和35~42℃。
5.如权利要求1所述PVC装饰膜的生产工艺,其特征在于,所述压花的温度为20±2℃;所述螺杆挤出机中,175~190℃,二区温度为140~155℃,三区温度为160~170℃。
6.如权利要求1所述PVC装饰膜的生产工艺,其特征在于,所述压延为五辊压延:
1#辊温度为185~195℃,线速度为7~10m/min,2#辊温度为185~195℃,线速度为9~12m/min,3#辊温度为190~200℃,线速度为11~14m/min,4#辊温度为200~210℃,线速度为13~16m/min,5#辊温度为190~205℃,线速度为15~18m/min。
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