CN107090145B - 一种pvc薄膜及其制备方法 - Google Patents
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Abstract
本发明公开了一种PVC薄膜,所述PVC薄膜的制备原料包含以下重量份的组分:30~60份PVC树脂粉,40~70份PVC弹性体树脂粉,20~28份主增塑剂和0~5份环氧大豆油;另外,本发明还公开了上述PVC薄膜的制备方法,通过本发明的方法制备的PVC薄膜的拉伸强度、断裂伸长率、弹性模量均得到强化。
Description
技术领域
本发明涉及一种PVC薄膜,尤其是一种PVC薄膜及其制备方法。
背景技术
作为不干胶广告材料的半硬质PVC薄膜增塑剂含量一般为22~28份(对应于配方中100份PVC树脂加入的增塑剂份数),当增塑剂含量低于22份时,薄膜太硬而脆,不利于加工和使用;而当增塑剂含量高于28份时,薄膜变得太软,在后续加工时容易产生拉伸而变形,且相对高的增塑剂含量容易使PVC所含的增塑剂往不干胶层迁移,薄膜在使用时产生体积收缩而使丝印或数码喷绘的广告图案变形。在冬天季节,半硬质PVC薄膜由于环境温度低而变得硬而脆,不利于加工和使用,靠增加增塑剂用量来避免PVC薄膜在低温环境变硬变脆由于上述的增塑剂迁移产生体积收缩风险而不可行,因而通常要通过加入低温性能良好的直链型结构二元酸酯增塑剂(如DOA、DNA、DOS等),或加入氯化聚乙烯、MBS、亚克力树脂等抗冲击改性剂,或混入高成本的NBR、EVA或聚氨酯弹性体改性来提高耐低温性能。然而,直链型结构的二元酸酯因为是二级增塑剂,其与PVC的相容性差于主增塑剂,容易往不干胶层迁移而使薄膜产生体积收缩;另外,氯化聚乙烯降低了薄膜的光洁度,MBS和NBR的耐候性能差,EVA和聚氨酯弹性体成本太高,并且聚氨酯在半硬质配方加工性能不好。
发明内容
基于此,本发明的目的在于克服上述现有技术的不足之处而提供一种拉伸强度、断裂伸长率和弹性模量得到强化的PVC薄膜。
为实现上述目的,本发明采取的技术方案为:一种PVC薄膜,所述PVC薄膜的制备原料包含以下重量份的组分:30~60份PVC树脂粉,40~70份PVC弹性体树脂粉,20~28份主增塑剂和0~5份环氧大豆油。应当说明的是,环氧大豆油是一种聚氯乙烯的增塑剂兼稳定剂,其与PVC树脂相溶性好,挥发性低、迁移性小,具有优良的热稳定性和光稳定性,耐水性和耐油性亦佳,可赋予制品良好的机械强度、耐候性及电性能,且无毒性;PVC树脂粉为k值k-60、k-65或k-70的PVC树脂粉。
优选地,所述组分还包括1~20份添加剂,所述添加剂中包含1~5重量份的热稳定剂和1~15重量份钛白粉;其中,稳定剂为钡锌复合盐热稳定剂,钛白粉即二氧化钛。
优选地,所述PVC弹性体树脂粉为弹性体成分与PVC组成的无规共聚物,其中,弹性体成分为氯乙烯-醋酸乙烯共聚物;更优选地,所述氯乙烯-醋酸乙烯共聚物的质量为所述PVC弹性体树脂粉质量的4~6%。
优选地,所述主增塑剂选自邻苯二甲酸酯、对苯二甲酸二辛酯(DOTP)、偏苯三酸三辛酯(TOTM)、聚氯乙烯(Hexamoll DINCH)和聚酯中的至少一种。应当说明的是,主增塑剂可以是邻苯二甲酸酯、DOTP、TOTM、Hexamoll DINCH和聚酯的混合物。应当说明的是,聚酯即聚己二酸丙二醇酯。
优选地,所述邻苯二甲酸酯选自邻苯二甲酸二异壬酯(DINP)、邻苯二甲酸二癸酯(DPHP)、邻苯二甲酸二辛酯(DOP)和邻苯二甲酸二异癸酯(DIDP)中的至少一种。
作为本发明的另一方面,本发明还提供了上述PVC薄膜的制备方法,包括以下步骤:
(1)按质量份数称取所述组分,混合均匀后密炼塑化,之后再次塑化使之均匀,得到胶料,所得胶料过滤;
(2)步骤(1)过滤后所得胶料,通过压延机压延,之后,经过由镜面钢轮与粗糙度为Ra 0.07~0.12um的橡胶轮组成的轮组压花成型;
(3)步骤(2)压花所得薄膜由引出轮引出后,经过30~120℃温炼及10~50℃冷却轮组定型,然后,依次经裁边、预热、加压、收卷,即得所述PVC薄膜。应当说明的是,引出轮可以是3个并排设置,由此,步骤(2)所得薄膜经过引出轮后,薄膜温度会有一定程度的降低;可以根据需要调整引出轮的个数,以起到薄膜散热的目的。
优选地,所述步骤(2)中压延机为倒L型4轮压延机,所述倒L型4轮压延机的第三轮和第四轮的轮面为电镀镜面。应当说明的是,倒L型4轮压延机包括4个压延轮,4个压延轮组成倒L型,第一轮和第二轮位于L的短轴上,第三轮和第四轮位于L的长轴上。
综上所述,本发明的有益效果为:
本发明的PVC薄膜的拉伸强度、断裂伸长率、弹性模量与现有通用配方和常规改善配方相比均得到了强化,耐低温性能也达到现有技术的水平;同时,由于本发明的PVC薄膜的原料中相应降低了增塑剂的用量,增塑剂往不干胶层迁移的程度变小,由此产生的体积收缩也比原通用配方和常规改善配方相应更小,将使半硬质PVC薄膜制作的不干胶广告材料的丝印或数码喷绘图案尺寸更稳定。
附图说明
图1为本发明的PVC薄膜的制备方法的示意图;
其中,1、高速混合机,2、密炼机,3、双辊开炼机,4、过滤机,5、压延机,6、引出轮,7、镜面钢轮,8、铁氟龙轮,9、温炼轮,10、磅料系统,11、漏斗,12、过滤网,13、第三轮,14、第四轮,15、冷却轮组,16、卷取机。
具体实施方式
本发明针对冬天季节半硬质PVC薄膜由于环境温度低而变得硬而脆,不利于加工和使用的局限,通过PVC配方原材料的选择和配方设计,所选用PVC树脂粉为常规的PVC树脂粉和特殊PVC树脂粉按一定比例混合,其中特殊PVC树脂粉为PVC与一定量弹性体成分组成的无规共聚物树脂,在相应降低增塑剂用量的条件下,由压延工艺加工制成高性能的半硬质PVC薄膜。与原通用配方和添加亚克力抗冲击改性剂的常规改善配方相比,其拉伸强度、断裂伸长率、弹性模量均得到了强化,而耐低温性能也达到了与常规改善配方的水平。同时,由于本发明的配方相应降低了增塑剂的用量,增塑剂往不干胶层迁移的程度变小,由此产生的体积收缩也将比原通用配方和常规改善配方相应更小,将使半硬质PVC薄膜不干胶广告材料的丝印或数码喷绘图案尺寸更稳定。
为更好的说明本发明的目的、技术方案和优点,下面将结合附图和具体实施例对本发明作进一步说明。
实施例1
一种PVC薄膜,制备原料包含以下重量份的组分:30份k-60PVC树脂粉,70份PVC弹性体树脂粉(其中含有质量分数4%的氯乙烯-醋酸乙烯共聚物),20份苯二甲酸酯和DOTP混合物(质量比为1:1),以及20份添加剂,添加剂中包含1份钡锌稳定剂和1份钛白粉。
上述PVC薄膜的制备方法如图1所示,包括以下步骤:按质量份数称取组分后,加入高速混合机1内混合均匀,之后进入密炼机2(也可以是行星挤出机)进行密炼塑化,再进入双辊开炼机3再进行塑化使之均匀,然后胶料进入过滤机4过滤杂质,再通过倒L型4轮压延机5压延,先由引出轮6引出,经过由镜面钢轮7与粗糙度Ra 0.07um橡胶轮8组成的轮组压花成型,接下来经30℃温炼轮9温炼及10℃冷却轮组15定型,最后经裁边、预热、加压、收卷即得所述PVC薄膜。
其中,倒L型4轮压延机包括4个压延轮,4个压延轮组成倒L型,第一轮和第二轮位于L的短轴上,第三轮13和第四轮14位于L的长轴上;倒L型4轮压延机的第三轮13和第四轮14的轮面为电镀镜面;
压延机的压延轮的温度为215摄氏度;压延轮的速度为70M/min;收卷机的收卷速度为95M/min;在高速混合机内混合时组分的温度为125摄氏度;过滤机挤出胶料温度为132摄氏度。
实施例2
一种PVC薄膜,制备原料包含以下重量份的组分:46份k-70PVC树脂粉,55份PVC弹性体树脂粉(其中含有质量分数5%氯乙烯-醋酸乙烯共聚物),25份聚己二酸丙二醇酯和1.3份环氧大豆油,以及11份添加剂,添加剂中包含3份钡锌稳定剂和7份钛白粉。
上述PVC薄膜的制备方法如图1所示,包括以下步骤:按质量份数称取组分后,加入高速混合机1内混合均匀,之后进入密炼机2(也可以是行星挤出机)进行密炼塑化,再进入双辊开炼机3再进行塑化使之均匀,然后胶料进入过滤机4过滤杂质,再通过倒L型4轮压延机5压延,先由引出轮6引出,经过由镜面钢轮7与粗糙度Ra 0.096um橡胶轮8组成的轮组压花成型,接下来经60℃温炼轮9温炼及23℃冷却轮组15定型,最后经裁边、预热、加压、收卷即得所述PVC薄膜。
其中,倒L型4轮压延机包括4个压延轮,4个压延轮组成倒L型,第一轮和第二轮位于L的短轴上,第三轮13和第四轮14位于L的长轴上;倒L型4轮压延机的第三轮13和第四轮14的轮面为电镀镜面;
压延机的压延轮的温度为189摄氏度;压延轮的速度为35M/min;收卷机的收卷速度为63M/min;在高速混合机内混合时组分的温度为91摄氏度;过滤机挤出胶料温度为157摄氏度。
实施例3
一种PVC薄膜,制备原料包含以下重量份的组分:60份k-65PVC树脂粉,40份PVC弹性体树脂粉(其中含有质量分数6%氯乙烯-醋酸乙烯共聚物),28份TOTM和Hexamoll DINCH的混合物(质量比为1:3),5份环氧大豆油,以及1份添加剂,添加剂中包含5份钡锌稳定剂和15份钛白粉。
上述PVC薄膜的制备方法如图1所示,包括以下步骤:按质量份数称取组分后,加入高速混合机1内混合均匀,之后进入密炼机2(也可以是行星挤出机)进行密炼塑化,再进入双辊开炼机3再进行塑化使之均匀,然后胶料进入过滤机4过滤杂质,再通过倒L型4轮压延机5压延,先由引出轮6引出后,经过由镜面钢轮7与粗糙度Ra 0.12um橡胶轮8组成的轮组压花成型,接下来经120℃温炼轮9温炼及50℃冷却轮组15定型,最后经裁边、预热、加压、收卷即得所述PVC薄膜。
其中,倒L型4轮压延机包括4个压延轮,4个压延轮组成倒L型,第一轮和第二轮位于L的短轴上,第三轮13和第四轮14位于L的长轴上;倒L型4轮压延机的第三轮13和第四轮14的轮面为电镀镜面;
压延机的压延轮的温度为160摄氏度;压延轮的速度为15M/min;收卷机的收卷速度为25M/min;在高速混合机内混合时组分的温度为72摄氏度;过滤机挤出胶料温度为180摄氏度。
实施例4本发明的PVC薄膜性能测试
测试对象:实施例1-3的PVC薄膜、原通用配方制得的PVC薄膜和常规改善配方制得的PVC薄膜;测试对象的原料配比如下表1所示:
表1用于测试的PVC薄膜的原料配比
测试方法:测试拉伸强度、断裂伸长率和13%弹性模量的测试标准为ASTMD882;耐低温抗冲击测试标准为ASTM D1790。
测试结果:如下表2所示。
表2PVC薄膜的性能测试结果
注:原通用配方、常规改善配方采用常规的压延工艺制得PVC薄膜,而本发明的PVC薄膜由本发明的制备方法获得。
结合表1和表2的数据可以得知,采用本发明的方法制备的PVC薄膜相对现有的通用配方和改善配方,在拉伸强度、断裂伸长率和弹性模量三个方面的性能上明显更优,其中采用实施例2的配方和方法制得PVC薄膜的拉伸强度、断裂伸长率和弹性模量三方面性能最优。
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薄膜,其特征在于,所述PVC薄膜的制备原料包含以下重量份的组分:30~60份的PVC树脂粉,40~70份PVC弹性体树脂粉,20~28份的主增塑剂和0~5份的环氧大豆油;所述PVC弹性体为弹性体成分与PVC组成的无规共聚物,其中,所述弹性体成分为氯乙烯-醋酸乙烯共聚物,所述氯乙烯-醋酸乙烯共聚物的质量为所述PVC弹性体树脂粉质量的4~6%。
2.根据权利要求1所述的PVC薄膜,其特征在于,还包括1~20份添加剂,所述添加剂中包含1~5重量份的热稳定剂和1~15重量份钛白粉。
3.根据权利要求1所述的PVC薄膜,其特征在于,所述主增塑剂选自邻苯二甲酸酯、对苯二甲酸二辛酯、偏苯三酸三辛酯、聚氯乙烯和聚酯中的至少一种。
4.根据权利要求3所述的PVC薄膜,其特征在于,所述邻苯二甲酸酯选自邻苯二甲酸二异壬酯、邻苯二甲酸二癸酯、邻苯二甲酸二辛酯和邻苯二甲酸二异癸酯中的至少一种。
5.一种如权利要求1~4任一项所述的PVC薄膜的制备方法,其特征在于,包括以下步骤:
(1)按质量份数称取所述组分,混合均匀后密炼塑化,之后再次塑化使之均匀,得到胶料,所得胶料过滤;
(2)步骤(1)过滤后所得胶料,通过压延机压延,之后,经过由镜面钢轮与粗糙度为Ra0.07~0.12μm的橡胶轮组成的轮组压花成型;
(3)步骤(2)压花所得薄膜由引出轮引出后,经过30~120℃温炼及10~50℃冷却轮组定型,然后,依次经裁边、预热、加压、收卷,即得所述PVC薄膜。
6.根据权利要求5所述的制备方法,其特征在于,所述步骤(2)中压延机为倒L型4轮压延机,所述倒L型4轮压延机的第三轮和第四轮的轮面为电镀镜面。
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