CN113183568A - 一种无胶高粘门板保护膜及制备方法 - Google Patents

一种无胶高粘门板保护膜及制备方法 Download PDF

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CN113183568A
CN113183568A CN202110457973.8A CN202110457973A CN113183568A CN 113183568 A CN113183568 A CN 113183568A CN 202110457973 A CN202110457973 A CN 202110457973A CN 113183568 A CN113183568 A CN 113183568A
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唐以峰
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Wuxi Junrui New Material Technology Co ltd
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Abstract

本发明提供了一种无胶高粘门板保护膜及制备方法,涉及高分子材料领域,由外层膜、中层膜和内层膜组成;所述外层膜由以下成分组成:聚甲基丙烯酸甲酯、热塑性弹性体、聚偏氟乙烯、全氟磺酸树脂纤维、磺化石墨烯、增容剂;所述中层膜由LDPE和LLDPE组成;所述内层膜由以下成分组成:LDPE、LLDPE、丁基壳聚糖、纳米纤维素晶须,本发明所制备的无胶高粘门板保护膜具有高粘性,附着力强,与门板具有良好的贴附性,制备工艺简单,具有广泛的应用前景。

Description

一种无胶高粘门板保护膜及制备方法
技术领域
本发明涉及高分子材料领域,具体涉及一种无胶高粘门板保护膜及制备方法。
背景技术
门板在运输和使用过程中,为了保护门板不被硬物划花,影响美观,往往在其表面粘附一层保护膜,现有的大多数保护膜都是利用胶黏剂粘附在门板上,这既不环保,而且后续如果更换会在门板表面残留胶迹,影响美观,目前也有少量无胶自粘膜,但是一方面粘性较差,易翘边脱落,另一方面力学性能和耐溶剂性差,易撕裂或腐蚀导致破损。
发明内容
发明目的:针对上述技术问题,本发明提供了一种无胶高粘门板保护膜及制备方法。
为了达到上述发明目的,本发明所采用的技术方案如下:
一种无胶高粘门板保护膜,由外层膜、中层膜和内层膜组成;
其中,外层膜厚度占保护膜总厚度的20-30%,优选为20-25%,进一步优选为25%;
中层膜占保护膜总厚度的50-60%,优选为50-55%,进一步优选为50%;
所述外层膜由以下成分组成:
聚甲基丙烯酸甲酯、热塑性弹性体、聚偏氟乙烯、全氟磺酸树脂纤维、磺化石墨烯、增容剂;
其中的全氟磺酸树脂纤维可以直接外购或利用静电纺丝法制得;
所述中层膜由LDPE和LLDPE组成;
所述内层膜由以下成分组成:
LDPE、LLDPE、丁基壳聚糖、纳米纤维素晶须。
其中,丁基壳聚糖可以直接外购或自制,其制备方法参考曹兴,李露,于世涛,刘仕伟.高强度丁基壳聚糖膜的制备及性能测定*[J].化工科技,2016,(第5期)。
纳米纤维素晶须可以直接外购或自制,其制备方法参考李金玲,陈广祥,叶代勇.纳米纤维素晶须的制备及应用的研究进展[J].林产化学与工业,2010,(第2期)。
进一步地,所述外层膜由以下重量份数的成分组成:
聚甲基丙烯酸甲酯30-40份、热塑性弹性体10-20份、聚偏氟乙烯1-2份、全氟磺酸树脂纤维3-5份、磺化石墨烯2-3份、增容剂1-2份。
优选地,所述所述外层膜由以下重量份数的成分组成:
聚甲基丙烯酸甲酯35份、热塑性弹性体12份、聚偏氟乙烯1份、全氟磺酸树脂纤维5份、磺化石墨烯2份、增容剂1份。
进一步地,所述中层膜中LDPE和LLDPE的重量比为1-3:1-3。
优选地,所述中层膜中LDPE和LLDPE的重量比为1-2:1-2。
优选地,所述中层膜中LDPE和LLDPE的重量比为2:1。
进一步地,所述内层膜由以下重量份数的成分组成:
LDPE 10-20份、LLDPE 10-20份、丁基壳聚糖5-10份、纳米纤维素晶须5-10份。
优选地,所述内层膜由以下重量份数的成分组成:
LDPE 20份、LLDPE 10份、丁基壳聚糖5份、纳米纤维素晶须5份。
进一步地,所述热塑性弹性体为SBS、SIS、SEBS、SEPS、TPU、TPB、TPI中的任意一种或多种组合。
进一步地,所述磺化石墨烯的制备方法如下:
将氧化石墨烯粉末分散于水中,用碳酸钠调节体系pH至9-10,加入第一份的硼氢化钠,升温至85-90℃搅拌8-15h,恢复室温超声振荡20-30min,加入牛磺酸,升温至50-60℃搅拌30-50h,恢复室温,再加入第二份的硼氢化钠,继续搅拌5-10h,过滤,水洗后干燥即可。
进一步地,所述石墨烯粉末与牛磺酸的质量比为1:40-50。
进一步地,所述第一份的硼氢化钠与第二份的硼氢化钠的质量比为1:1.5-2。
进一步地,所述增容剂为氯化聚乙烯、PP-g-MAH、HDPE-g-MAH、LDPE-g-MAH、PE-g-MAH中的任意一种或多种组合。
上述无胶高粘门板保护膜的制备方法,具体如下:
S1:将聚甲基丙烯酸甲酯、热塑性弹性体、聚偏氟乙烯、全氟磺酸树脂纤维、磺化石墨烯、增容剂加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到外层膜物料;
S2:将LDPE和LLDPE加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到中层膜物料;
S3:将LDPE、LLDPE、丁基壳聚糖、纳米纤维素晶须加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到内层膜物料;
S4:分别往外层膜料斗、中层膜料斗、内层膜料斗中加入外层膜物料、中层膜物料、内层膜物料,各料斗经三层共挤吹膜机挤出,挤出过程中外层膜挤出机构的螺杆温度为230-250℃,转速为320-360rpm,中层膜挤出机构的螺杆温度为180-210℃,转速为320-360rpm,内层膜挤出机构的螺杆温度为200-210℃,转速为320-360rpm,汇流至螺旋型吹膜模头,模头温度为230-250℃,经模头挤出后拉伸,5-8℃风冷定型后,再对内层膜一侧进行电晕处理,电晕处理的电流强度为5-8A,电晕处理的时间为0.5-1s,切边收卷,即可得到所述无胶高粘门板保护膜。
本发明的有益效果:
本发明所制备的保护膜由外层膜、中层膜和内层膜组成,其中外层膜中的聚甲基丙烯酸甲酯价格低廉,有良好的成膜性,热塑性弹性体的加入可以改善外层膜的机械性能和加工性能,聚偏氟乙烯的分子结构中以氟-碳化合键结合,这种具有短键性质的结构与氢离子形成最稳定最牢固的结合,聚偏氟乙烯的加入可以改善外层膜的耐磨性和抗冲击性能,目前有文献公开了聚偏氟乙烯与磺化氧化石墨烯、全氟磺酸掺杂成膜的技术,发明人尝试将全氟磺酸树脂纤维、磺化石墨烯(磺化石墨烯相比于磺化氧化石墨烯更稳定,其表面不含羟基和羧基,发明人先尝试的是磺化氧化石墨烯,但是并没有好的效果,后尝试的加入磺化石墨烯)引入外层膜的配方中,发现外层膜的耐化学性、力学性能及防污性的确有所提高,所制成的外层膜具有良好的力学性能和耐溶剂性,具有良好的防护效果;中层膜由LDPE和LLDPE组成,LLDPE分子呈线型结构,分子链上含有一定数量的短支链,分子链之间堆砌较为规整,结晶度较高,因此其拉伸强度、撕裂强度、耐穿刺性和断裂伸长率均较高,具有良好的综合性能,但较短的支链和较窄的相对分子质量分布使LLDPE熔体黏度高,难加工,而LDPE透明性好,易于加工,将LDPE和LLDPE共混,则可改善加工性能,作为中层膜具有很好的支撑效果,而且可以降低整体保护膜的价格;内层膜与门板直接接触,发明人加入了丁基壳聚糖和纳米纤维素晶须,目前壳聚糖成膜的相关报道中,大多是流涎成膜或涂覆成膜,但考虑到壳聚糖在200-300℃下能稳定存在,发明人尝试将丁基壳聚糖直接加入后经过高温熔融后挤出成膜,测试证明,加入后的确提升了内层膜的粘结力,而且丁基壳聚糖相比于壳聚糖,在电晕处理时,分子链更易断裂,电晕处理后内层膜的表面张力更高,也更容易带上静电,与门板的结合力更强,烷基的引入,使其与LDPE和LLDPE有更好的结合性能,纳米纤维素晶须加入一方面提升了内层膜的力学性能,另一方面晶须可以作为“锚点”与门板勾连,提升粘结力;本发明所制备的无胶高粘门板保护膜具有高粘性,附着力强,与门板具有良好的贴附性,制备工艺简单,具有广泛的应用前景。
附图说明
图1为本发明无胶高粘门板保护膜的结构示意图。
图中标号分别代表:
1-外层膜、2-中层膜、3-内层膜。
具体实施方式
实施例中未注明具体条件者,按照常规条件或制造商建议的条件进行。所用试剂或仪器未注明生产厂商者,均为可以通过市售购买获得的常规产品。
参照图1,一种无胶高粘门板保护膜,自上而下由外层膜1、中层膜2和内层膜3组成;
外层膜1由以下成分组成:
聚甲基丙烯酸甲酯、热塑性弹性体、聚偏氟乙烯、全氟磺酸树脂纤维、磺化石墨烯、增容剂;
中层膜2由LDPE和LLDPE组成;
内层膜3由以下成分组成:
LDPE、LLDPE、丁基壳聚糖、纳米纤维素晶须。
实施例1:
一种无胶高粘门板保护膜,由外层膜、中层膜和内层膜组成;
其中,外层膜厚度2.5μm;中层膜厚度5μm,内层膜厚度2.5μm;
外层膜由以下重量份数的成分组成:
聚甲基丙烯酸甲酯35份、热塑性弹性体SEBS 12份、聚偏氟乙烯1份、全氟磺酸树脂纤维5份、磺化石墨烯2份、增容剂LDPE-g-MAH 1份。
中层膜中LDPE和LLDPE的重量比为2:1。
内层膜由以下重量份数的成分组成:
LDPE 20份、LLDPE 10份、丁基壳聚糖5份、纳米纤维素晶须5份。
磺化石墨烯的制备方法如下:
将氧化石墨烯粉末分散于15倍质量的水中,用碳酸钠调节体系pH至9,加入第一份的硼氢化钠,升温至85℃搅拌12h,恢复室温超声振荡20min,加入石墨烯粉末质量50倍的牛磺酸,升温至50℃搅拌35h,恢复室温,再加入第二份的硼氢化钠,第一份的硼氢化钠与第二份的硼氢化钠的质量比为1:2,继续搅拌10h,过滤,水洗后干燥即可。
无胶高粘门板保护膜的制备方法如下:
将聚甲基丙烯酸甲酯、热塑性弹性体SEBS、聚偏氟乙烯、全氟磺酸树脂纤维、磺化石墨烯、增容剂LDPE-g-MAH加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到外层膜物料,将LDPE和LLDPE加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到中层膜物料,将LDPE、LLDPE、丁基壳聚糖、纳米纤维素晶须加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到内层膜物料,分别往外层膜料斗、中层膜料斗、内层膜料斗中加入外层膜物料、中层膜物料、内层膜物料,各料斗经三层共挤吹膜机挤出,挤出过程中外层膜挤出机构的螺杆温度为230℃,转速为350rpm,中层膜挤出机构的螺杆温度为210℃,转速为350rpm,内层膜挤出机构的螺杆温度为210℃,转速为350rpm,汇流至螺旋型吹膜模头,模头温度为250℃,经模头挤出后拉伸,8℃风冷定型后,再对内层膜一侧进行电晕处理,电晕处理的电流强度为8A,电晕处理的时间为1s,切边收卷,即可得到所述无胶高粘门板保护膜。
实施例2:
一种无胶高粘门板保护膜,由外层膜、中层膜和内层膜组成;
其中,外层膜厚度2.5μm;中层膜厚度5μm,内层膜厚度2.5μm;
外层膜由以下重量份数的成分组成:
聚甲基丙烯酸甲酯30份、热塑性弹性体SEBS 10份、聚偏氟乙烯1份、全氟磺酸树脂纤维3份、磺化石墨烯2份、增容剂LDPE-g-MAH 1份。
中层膜中LDPE和LLDPE的重量比为1:1。
内层膜由以下重量份数的成分组成:
LDPE 10份、LLDPE 10份、丁基壳聚糖5份、纳米纤维素晶须5份。
磺化石墨烯的制备方法如下:
将氧化石墨烯粉末分散于10倍质量的水中,用碳酸钠调节体系pH至9,加入第一份的硼氢化钠,升温至85℃搅拌8h,恢复室温超声振荡20min,加入石墨烯粉末质量40倍的牛磺酸,升温至50℃搅拌30h,恢复室温,再加入第二份的硼氢化钠,第一份的硼氢化钠与第二份的硼氢化钠的质量比为1:1.5,继续搅拌5h,过滤,水洗后干燥即可。
无胶高粘门板保护膜的制备方法如下:
将聚甲基丙烯酸甲酯、热塑性弹性体SEBS、聚偏氟乙烯、全氟磺酸树脂纤维、磺化石墨烯、增容剂LDPE-g-MAH加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到外层膜物料,将LDPE和LLDPE加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到中层膜物料,将LDPE、LLDPE、丁基壳聚糖、纳米纤维素晶须加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到内层膜物料,分别往外层膜料斗、中层膜料斗、内层膜料斗中加入外层膜物料、中层膜物料、内层膜物料,各料斗经三层共挤吹膜机挤出,挤出过程中外层膜挤出机构的螺杆温度为230℃,转速为320rpm,中层膜挤出机构的螺杆温度为180℃,转速为320rpm,内层膜挤出机构的螺杆温度为200℃,转速为320rpm,汇流至螺旋型吹膜模头,模头温度为230℃,经模头挤出后拉伸,5℃风冷定型后,再对内层膜一侧进行电晕处理,电晕处理的电流强度为8A,电晕处理的时间为1s,切边收卷,即可得到所述无胶高粘门板保护膜。
实施例3:
一种无胶高粘门板保护膜,由外层膜、中层膜和内层膜组成;
其中,外层膜厚度2.5μm;中层膜厚度5μm,内层膜厚度2.5μm;
外层膜由以下重量份数的成分组成:
聚甲基丙烯酸甲酯40份、热塑性弹性体SEBS 20份、聚偏氟乙烯2份、全氟磺酸树脂纤维5份、磺化石墨烯3份、增容剂LDPE-g-MAH 2份。
中层膜中LDPE和LLDPE的重量比为3:1。
内层膜由以下重量份数的成分组成:
LDPE 20份、LLDPE 20份、丁基壳聚糖10份、纳米纤维素晶须10份。
磺化石墨烯的制备方法如下:
将氧化石墨烯粉末分散于20倍质量的水中,用碳酸钠调节体系pH至10,加入第一份的硼氢化钠,升温至90℃搅拌15h,恢复室温超声振荡30min,加入石墨烯粉末质量50倍的牛磺酸,升温至60℃搅拌50h,恢复室温,再加入第二份的硼氢化钠,第一份的硼氢化钠与第二份的硼氢化钠的质量比为1:2,继续搅拌10h,过滤,水洗后干燥即可。
无胶高粘门板保护膜的制备方法如下:
将聚甲基丙烯酸甲酯、热塑性弹性体SEBS、聚偏氟乙烯、全氟磺酸树脂纤维、磺化石墨烯、增容剂LDPE-g-MAH加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到外层膜物料,将LDPE和LLDPE加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到中层膜物料,将LDPE、LLDPE、丁基壳聚糖、纳米纤维素晶须加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到内层膜物料,分别往外层膜料斗、中层膜料斗、内层膜料斗中加入外层膜物料、中层膜物料、内层膜物料,各料斗经三层共挤吹膜机挤出,挤出过程中外层膜挤出机构的螺杆温度为250℃,转速为360rpm,中层膜挤出机构的螺杆温度为210℃,转速为360rpm,内层膜挤出机构的螺杆温度为210℃,转速为360rpm,汇流至螺旋型吹膜模头,模头温度为250℃,经模头挤出后拉伸,6℃风冷定型后,再对内层膜一侧进行电晕处理,电晕处理的电流强度为8A,电晕处理的时间为0.5s,切边收卷,即可得到所述无胶高粘门板保护膜。
实施例4:
一种无胶高粘门板保护膜,由外层膜、中层膜和内层膜组成;
其中,外层膜厚度2.5μm;中层膜厚度5μm,内层膜厚度2.5μm;
外层膜由以下重量份数的成分组成:
聚甲基丙烯酸甲酯30份、热塑性弹性体SEBS 20份、聚偏氟乙烯1份、全氟磺酸树脂纤维5份、磺化石墨烯2份、增容剂LDPE-g-MAH 2份。
中层膜中LDPE和LLDPE的重量比为1:3。
内层膜由以下重量份数的成分组成:
LDPE 10份、LLDPE 20份、丁基壳聚糖5份、纳米纤维素晶须10份。
磺化石墨烯的制备方法如下:
将氧化石墨烯粉末分散于10倍质量的水中,用碳酸钠调节体系pH至10,加入第一份的硼氢化钠,升温至85℃搅拌15h,恢复室温超声振荡20min,加入石墨烯粉末质量50倍的牛磺酸,升温至50℃搅拌50h,恢复室温,再加入第二份的硼氢化钠,第一份的硼氢化钠与第二份的硼氢化钠的质量比为1:1.5,继续搅拌10h,过滤,水洗后干燥即可。
无胶高粘门板保护膜的制备方法如下:
将聚甲基丙烯酸甲酯、热塑性弹性体SEBS、聚偏氟乙烯、全氟磺酸树脂纤维、磺化石墨烯、增容剂LDPE-g-MAH加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到外层膜物料,将LDPE和LLDPE加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到中层膜物料,将LDPE、LLDPE、丁基壳聚糖、纳米纤维素晶须加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到内层膜物料,分别往外层膜料斗、中层膜料斗、内层膜料斗中加入外层膜物料、中层膜物料、内层膜物料,各料斗经三层共挤吹膜机挤出,挤出过程中外层膜挤出机构的螺杆温度为230℃,转速为360rpm,中层膜挤出机构的螺杆温度为180℃,转速为360rpm,内层膜挤出机构的螺杆温度为200℃,转速为360rpm,汇流至螺旋型吹膜模头,模头温度为230℃,经模头挤出后拉伸,8℃风冷定型后,再对内层膜一侧进行电晕处理,电晕处理的电流强度为5A,电晕处理的时间为0.5s,切边收卷,即可得到所述无胶高粘门板保护膜。
实施例5:
一种无胶高粘门板保护膜,由外层膜、中层膜和内层膜组成;
其中,外层膜厚度2.5μm;中层膜厚度5μm,内层膜厚度2.5μm;
外层膜由以下重量份数的成分组成:
聚甲基丙烯酸甲酯40份、热塑性弹性体SEBS 10份、聚偏氟乙烯2份、全氟磺酸树脂纤维3份、磺化石墨烯3份、增容剂LDPE-g-MAH 1份。
中层膜中LDPE和LLDPE的重量比为1:2。
内层膜由以下重量份数的成分组成:
LDPE 15份、LLDPE 20份、丁基壳聚糖5份、纳米纤维素晶须8份。
磺化石墨烯的制备方法如下:
将氧化石墨烯粉末分散于20倍质量的水中,用碳酸钠调节体系pH至9,加入第一份的硼氢化钠,升温至90℃搅拌15h,恢复室温超声振荡30min,加入石墨烯粉末质量40倍的牛磺酸,升温至55℃搅拌40h,恢复室温,再加入第二份的硼氢化钠,第一份的硼氢化钠与第二份的硼氢化钠的质量比为1:1.5,继续搅拌10h,过滤,水洗后干燥即可。
无胶高粘门板保护膜的制备方法如下:
将聚甲基丙烯酸甲酯、热塑性弹性体SEBS、聚偏氟乙烯、全氟磺酸树脂纤维、磺化石墨烯、增容剂LDPE-g-MAH加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到外层膜物料,将LDPE和LLDPE加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到中层膜物料,将LDPE、LLDPE、丁基壳聚糖、纳米纤维素晶须加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到内层膜物料,分别往外层膜料斗、中层膜料斗、内层膜料斗中加入外层膜物料、中层膜物料、内层膜物料,各料斗经三层共挤吹膜机挤出,挤出过程中外层膜挤出机构的螺杆温度为250℃,转速为320rpm,中层膜挤出机构的螺杆温度为200℃,转速为320rpm,内层膜挤出机构的螺杆温度为200℃,转速为360rpm,汇流至螺旋型吹膜模头,模头温度为250℃,经模头挤出后拉伸,8℃风冷定型后,再对内层膜一侧进行电晕处理,电晕处理的电流强度为8A,电晕处理的时间为1s,切边收卷,即可得到所述无胶高粘门板保护膜。
实施例6:
一种无胶高粘门板保护膜,由外层膜、中层膜和内层膜组成;
其中,外层膜厚度2.5μm;中层膜厚度5μm,内层膜厚度2.5μm;
外层膜由以下重量份数的成分组成:
聚甲基丙烯酸甲酯40份、热塑性弹性体SEBS 15份、聚偏氟乙烯1份、全氟磺酸树脂纤维5份、磺化石墨烯2份、增容剂LDPE-g-MAH 1.5份。
中层膜中LDPE和LLDPE的重量比为3:1。
内层膜由以下重量份数的成分组成:
LDPE 15份、LLDPE 10份、丁基壳聚糖10份、纳米纤维素晶须5份。
磺化石墨烯的制备方法如下:
将氧化石墨烯粉末分散于12倍质量的水中,用碳酸钠调节体系pH至10,加入第一份的硼氢化钠,升温至90℃搅拌10h,恢复室温超声振荡20min,加入石墨烯粉末质量50倍的牛磺酸,升温至55℃搅拌30h,恢复室温,再加入第二份的硼氢化钠,第一份的硼氢化钠与第二份的硼氢化钠的质量比为1:2,继续搅拌5h,过滤,水洗后干燥即可。
无胶高粘门板保护膜的制备方法如下:
将聚甲基丙烯酸甲酯、热塑性弹性体SEBS、聚偏氟乙烯、全氟磺酸树脂纤维、磺化石墨烯、增容剂LDPE-g-MAH加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到外层膜物料,将LDPE和LLDPE加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到中层膜物料,将LDPE、LLDPE、丁基壳聚糖、纳米纤维素晶须加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到内层膜物料,分别往外层膜料斗、中层膜料斗、内层膜料斗中加入外层膜物料、中层膜物料、内层膜物料,各料斗经三层共挤吹膜机挤出,挤出过程中外层膜挤出机构的螺杆温度为250℃,转速为360rpm,中层膜挤出机构的螺杆温度为210℃,转速为320rpm,内层膜挤出机构的螺杆温度为200℃,转速为320rpm,汇流至螺旋型吹膜模头,模头温度为230℃,经模头挤出后拉伸,8℃风冷定型后,再对内层膜一侧进行电晕处理,电晕处理的电流强度为8A,电晕处理的时间为1s,切边收卷,即可得到所述无胶高粘门板保护膜。
对比例1
对比例1与实施例1基本相同,区别在于,外层膜中不加入全氟磺酸树脂纤维。
对比例2
对比例2与实施例1基本相同,区别在于,外层膜中不加入磺化石墨烯。
对比例3
对比例3与实施例1基本相同,区别在于,用普通石墨烯代替外层膜中的磺化石墨烯。
对比例4
对比例4与实施例1基本相同,区别在于,内层膜中不加入丁基壳聚糖。
对比例5
对比例5与实施例1基本相同,区别在于,用壳聚糖代替内层膜中的丁基壳聚糖。
性能测试:
将本发明实施例1-6制备得到的外层膜和对比例1-3制备得到的外层膜进行以下性能测试:
(1)拉伸强度、断裂伸长率测试
参照采用国际标准ISO1184-1983《塑料薄膜拉伸性能的测定》,测试结果见表1。
(2)耐溶剂性测试
聚合物在溶剂中不会溶解,只会溶胀,聚合物溶胀度越大,则其吸收的溶剂越多,耐溶剂性越差,因此,本申请用溶胀表征本发明外层膜的耐溶剂性。
根据GB/T14797.3-2008方法进行溶胀度测定:称量外层膜的质量(记为m1),将其放入盛装二氯甲烷容器中,在25℃下浸泡24h,取出并用滤纸将外层膜表面的溶剂擦去,称量质量(记为m2),测试3次,计算平均值。
溶胀度=[(m2-m1)/m1]*100%
将本发明实施例1-6制备得到的内层膜和对比例4-5制备得到的内层膜进行以下性能测试:
(3)剥离强度测试
按照《胶粘带剥离强度的实验方法》GB/T 2792-2014标准进行测试:
将25mm宽的内层膜贴合在PMMA板上,然后用2kg FINAT标准滚轮以300mm/min速度滚压贴合的内层膜,按照180°剥离强度测试方法测试3次,记录平均值作为剥离强度,测试结果见表2。
表1:
Figure BDA0003041255380000171
表2:
Figure BDA0003041255380000172
Figure BDA0003041255380000181
由上表1和表2可知,本发明所制备的保护膜由外层膜、中层膜和内层膜组成,其中外层膜具有良好的力学性能和耐溶剂性,具有良好的防护效果,内层膜具有高粘性,附着力强,与门板具有良好的贴附性,制备工艺简单,具有广泛的应用前景。
需要说明的是,在本文中,诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来,而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下,由语句“包括一个……”限定的要素,并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims (10)

1.一种无胶高粘门板保护膜,其特征在于,由外层膜、中层膜和内层膜组成;
所述外层膜由以下成分组成:
聚甲基丙烯酸甲酯、热塑性弹性体、聚偏氟乙烯、全氟磺酸树脂纤维、磺化石墨烯、增容剂;
所述中层膜由LDPE和LLDPE组成;
所述内层膜由以下成分组成:
LDPE、LLDPE、丁基壳聚糖、纳米纤维素晶须。
2.如权利要求1所述的无胶高粘门板保护膜,其特征在于,所述外层膜由以下重量份数的成分组成:
聚甲基丙烯酸甲酯30-40份、热塑性弹性体10-20份、聚偏氟乙烯1-2份、全氟磺酸树脂纤维3-5份、磺化石墨烯2-3份、增容剂1-2份。
3.如权利要求1所述的无胶高粘门板保护膜,其特征在于,所述中层膜中LDPE和LLDPE的重量比为1-3:1-3。
4.如权利要求1所述的无胶高粘门板保护膜,其特征在于,所述内层膜由以下重量份数的成分组成:
LDPE 10-20份、LLDPE 10-20份、丁基壳聚糖5-10份、纳米纤维素晶须5-10份。
5.如权利要求1所述的无胶高粘门板保护膜,其特征在于,所述热塑性弹性体为SBS、SIS、SEBS、SEPS、TPU、TPB、TPI中的任意一种或多种组合。
6.如权利要求1所述的无胶高粘门板保护膜,其特征在于,所述磺化石墨烯的制备方法如下:
将氧化石墨烯粉末分散于水中,用碳酸钠调节体系pH至9-10,加入第一份的硼氢化钠,升温至85-90℃搅拌8-15h,恢复室温超声振荡20-30min,加入牛磺酸,升温至50-60℃搅拌30-50h,恢复室温,再加入第二份的硼氢化钠,继续搅拌5-10h,过滤,水洗后干燥即可。
7.如权利要求6所述的无胶高粘门板保护膜,其特征在于,所述石墨烯粉末与牛磺酸的质量比为1:40-50。
8.如权利要求6所述的无胶高粘门板保护膜,其特征在于,所述第一份的硼氢化钠与第二份的硼氢化钠的质量比为1:1.5-2。
9.如权利要求1所述的无胶高粘门板保护膜,其特征在于,所述增容剂为氯化聚乙烯、PP-g-MAH、HDPE-g-MAH、LDPE-g-MAH、PE-g-MAH中的任意一种或多种组合。
10.一种如权利要求1-9所述的无胶高粘门板保护膜的制备方法,其特征在于,具体如下:
S1:将聚甲基丙烯酸甲酯、热塑性弹性体、聚偏氟乙烯、全氟磺酸树脂纤维、磺化石墨烯、增容剂加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到外层膜物料;
S2:将LDPE和LLDPE加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到中层膜物料;
S3:将LDPE、LLDPE、丁基壳聚糖、纳米纤维素晶须加入高速混合机中充分搅拌,混合均匀后,再转移至双螺杆挤出机中熔融挤出造粒,得到内层膜物料;
S4:分别往外层膜料斗、中层膜料斗、内层膜料斗中加入外层膜物料、中层膜物料、内层膜物料,各料斗经三层共挤吹膜机挤出,挤出过程中外层膜挤出机构的螺杆温度为230-250℃,转速为320-360rpm,中层膜挤出机构的螺杆温度为180-210℃,转速为320-360rpm,内层膜挤出机构的螺杆温度为200-210℃,转速为320-360rpm,汇流至螺旋型吹膜模头,模头温度为230-250℃,经模头挤出后拉伸,5-8℃风冷定型后,再对内层膜一侧进行电晕处理,电晕处理的电流强度为5-8A,电晕处理的时间为0.5-1s,切边收卷,即可得到所述无胶高粘门板保护膜。
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