CN107053779B - 一种薄型半覆膜电视机金属背板 - Google Patents

一种薄型半覆膜电视机金属背板 Download PDF

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CN107053779B
CN107053779B CN201710200713.6A CN201710200713A CN107053779B CN 107053779 B CN107053779 B CN 107053779B CN 201710200713 A CN201710200713 A CN 201710200713A CN 107053779 B CN107053779 B CN 107053779B
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赵华
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Abstract

本发明公开一种薄型半覆膜电视机金属背板，包括安装在电视机后侧的镀锌钢板基材，所述镀锌钢板基材后侧面层叠有化涂层，所述化涂层后侧面上部依次层叠有聚氨酯胶粘层、覆膜层和硬化保护涂层，所述化涂层后侧面下部层叠有防腐耐污涂层；所述镀锌钢板基材前侧面依次层叠有所述化涂层和所述防腐耐污涂层；所述化涂层为铬酸盐化学预处理液成膜。本发明集结构和功能优势于一体，兼具超薄的外形美观性和良好导电导热性、耐腐蚀性、耐污性、抗冲击性等物理机械性能，硬度高，保护性强，节省了制作材料，降低了工艺复杂程度。

Description

一种薄型半覆膜电视机金属背板
技术领域
本发明涉及覆膜金属板，具体为一种薄型半覆膜电视机金属背板，属于电视机零部件领域。
背景技术
目前，普通电视机背壳大多由两部分组成：因其内部导电需求，内层材质为金属板材，需安装面板和电路板；外部则为塑料面壳罩，以将电路板包裹起来，起保护膜的作用。因此该类电视机整体较厚，已逐渐无法满足现在消费者对于超薄电视机的需求。
在现有技术中，为了防止家用电器外壳由于磕碰、刮擦造成划伤和损坏，常采用的解决方案是在其外表面贴覆PE保护膜，但普通的PE保护膜存在较多缺点，如：硬度不够；与被保护产品之间粘贴不牢固，在使用过程中易出现脱落、两端翅起的现象。此外，由于电视机尤其是液晶电视的金属背板安装有液晶面板和电路板，因此对板材的导热导电性、耐候性、耐腐蚀性和防污性能等有较高的要求。
发明内容
针对现有技术中的问题，本申请人经过研究改进，提供一种集结构和功能优势于一体的薄型半覆膜电视机金属背板，其兼具超薄的外形美观性和良好导电导热性、耐腐蚀性、耐污性、抗冲击性等物理机械性能，硬度高，保护性强。
为实现以上技术目的，本发明采用以下技术方案：
一种薄型半覆膜电视机金属背板，包括安装在电视机后侧的镀锌钢板基材，所述镀锌钢板基材后侧面层叠有化涂层，所述化涂层后侧面上部依次层叠有聚氨酯胶粘层、覆膜层和硬化保护涂层，所述化涂层后侧面下部层叠有防腐耐污涂层，此处安装有电路板和面壳罩，面壳罩设在电路板外并将电路板包裹起来，起保护作用；所述镀锌钢板基材前侧面依次层叠有所述化涂层和所述防腐耐污涂层；所述化涂层为铬酸盐化学预处理液成膜；
所述硬化保护涂层以重量份数计包括以下组分：
将所述二官能度聚氨酯丙烯酸酯、2-羟基-3-苯氧丙基丙烯酸酯搅拌混匀，得预混料；向该预混料中加入所述硅氧烷流平剂、所述丙烯酸酯化二苯甲酮、所述乙酸乙酯和所述乙酸丁酯，搅拌混匀，得混合料；450目尼龙滤网过滤，即得硬化保护涂层涂料；
所述防腐耐污涂层以重量份数计包括以下组分：
将所述水溶性有机硅改性丙烯酸树脂，所述丙二醇，硅溶胶和所述硅烷偶联剂进行混合；将所述石墨烯，所述球形硅树脂微粉，所述纳米二氧化铈，所述等份的650目、900目、1300目片型锌粉逐步加入，充分搅拌均匀，得混合物；将所得混合物与所述固化剂混合，即得防腐耐污涂层涂料；
所述薄型半覆膜电视机金属背板具体制备方法如下：
步骤一：用浓度为20～50wt％的铬酸盐化学预处理液对所述镀锌钢板基材前后侧面进行钝化处理，烘干，得所述化涂层；
步骤二：在后侧面的所述化涂层下部以及前侧面的所述化涂层上辊涂所述防腐耐污涂层涂料，于75～80℃热风干燥，得所述防腐耐污涂层；
步骤三：在后侧面的所述化涂层上部涂覆聚氨酯胶水，于220～230℃固化，得所述聚氨酯胶粘层；
步骤四：于220～230℃在所述胶粘层上贴覆所述覆膜层；
步骤五：将所述硬化保护涂层涂料与稀释剂以3∶2的质量比混合均匀后涂覆于所述覆膜层上，于60～65℃热风干燥，UV固化，即得。
作为优选，所述石墨烯是通过氧化石墨还原法制得。
作为优选，所述镀锌钢板基材厚度为0.8～1.0mm。
作为优选，所述聚氨酯胶粘层湿膜厚度为23～25μm。
作为优选，所述覆膜层为PVC膜或PET膜，所述PVC膜厚度为0.2mm，所述PET膜厚度为25μm。
作为优选，所述硬化保护涂层厚度为10～15μm。
作为优选，所述防腐耐污涂层厚度为15～20μm。
作为优选，所述硬化保护涂层以重量份数计包括以下组分：
作为优选，所述UV固化的紫外线强度为180～220mW/cm2。
作为优选，所述铬酸盐化学预处理液浓度为20wt％。
本发明旨克服现有电视机整体较厚的不足，设计了一种金属基材后侧面上部贴覆膜和硬化保护涂层，下部辊涂防腐耐污涂层，再于防腐耐污涂层处安装电路板和面壳罩的半覆膜金属背板。一方面，在结构上，巧妙地将传统电视机的金属背板和塑料面罩结合，从整体上减少了电视机的厚度，节省了塑料面壳罩材料，可一次冲压成型，降低了工艺复杂程度。另一方面，在大幅降低背板厚度的外形美观基础上提升了综合物理机械性能：(1)在防腐耐污涂层中：采用锌粉——石墨烯——纳米二氧化铈的特殊复配组合，对基材抗腐蚀性产生协同增效作用，并具有理想的导电导热性能，保证了内部电路的导电和散热要求；等份的650目、900目、1300目片型锌粉复配能在涂层中产生微小空隙，可提高涂层的屏蔽性，从而增强镀锌钢板的耐腐蚀性能；石墨烯为单分子层或几个分子层的片状结构，密度小，具有超高的电子迁移率、电导率、热导率、杨氏模量等优异性能，其添加能对涂层中扩散的腐蚀性小分子介质产生良好的物理阻隔作用，大大提高钢板的耐腐蚀性，且赋予涂层理想的导热导电性能；以水溶性有机硅改性丙烯酸树脂为基体添加石墨烯和硅烷偶联剂，使得在石墨烯与基体之间以及涂层与金属基材之间均产生良好的结合力；涂层中添加适量的纳米二氧化铈，该种超微细粉体可参与涂层固化并形成特殊的屏蔽层，有效隔绝腐蚀介质，从而进一步提高镀锌钢板的耐腐蚀性能；球形硅树脂微粉具有密度小，耐热性、润滑性、疏水性好等优良性能，其添加可改善涂层表面的光泽性、疏水性、防污性和阻燃性。(2)创造性地采用特制硬化保护涂层替代传统的PE保护膜，该保护涂层涂料可紧密贴合PET膜，附着强度达1级，不易开胶，抗冲击强度和硬度高，成膜后具有良好的物理机械性能，保护性好。综上，本发明提供了一款结构功能一体化的薄型半覆膜电视机金属背板，在本行业具有广阔的市场应用前景。
附图说明
图1为本发明半覆膜电视机金属背板的剖面示意图。
附图标记：1、镀锌钢板基材；2、化涂层；3、聚氨酯胶粘层；4、PET覆膜层；5、硬化保护涂层；6、防腐耐污涂层；7、化涂层；8、防腐耐污涂层。
具体实施方式
下面结合几个具体实施例详细说明本发明的具体实施方式，但不对本发明的权利要求做任何限定。
如图1所示，实施例1～实施例3所制半覆膜电视机金属背板包括安装在电视机后侧的镀锌钢板基材1，镀锌钢板基材1后侧面层叠有化涂层2，化涂层2后侧面上部依次层叠有聚氨酯胶粘层3、PET覆膜层4和硬化保护涂层5，化涂层2后侧面下部层叠有防腐耐污涂层6；镀锌钢板基材1前侧面依次层叠有化涂层7和防腐耐污涂层8。
实施例1～实施例3所制半覆膜电视机金属背板中的防腐耐污涂层和硬化保护涂层涂料各组分及重量份数参见表1。
表1
实施例1～实施例3中防腐耐污涂层的具体制备方法如下：
将水溶性有机硅改性丙烯酸树脂，丙二醇，硅溶胶和硅烷偶联剂kh550进行混合；再将石墨烯，球形硅树脂微粉，纳米二氧化铈，等份的650目、900目、1300目片型锌粉逐步加入，于1500转/分钟充分搅拌均匀，得到混合物；将所得混合物与固化剂混合，即得防腐耐污涂层涂料；其中，石墨烯通过氧化石墨还原法制备得到，为固态物质。
实施例1～实施例3中硬化保护涂层涂料的具体制备方法如下：
将二官能度聚氨酯丙烯酸酯、2-羟基-3-苯氧丙基丙烯酸酯投入反应缸中，于室温以450转/分钟的转速充分搅拌混合均匀，得到预混料；向该预混料中加入硅氧烷流平剂、丙烯酸酯化二苯甲酮、乙酸乙酯和乙酸丁酯，于室温以450转/分钟的转速充分搅拌混合均匀，得到混合料；用450目尼龙滤网过滤该混合料，即得硬化保护涂层涂料。
实施例1～实施例3薄型半覆膜电视机金属背板的具体制备方法如下：
开卷放卷，清洗后经过纠偏装置纠偏；用浓度为20wt％的铬酸盐化学预处理液对镀锌钢板基材(厚度0.8mm)前后侧面进行钝化处理，烘干，得化涂层；在后侧面的化涂层下部以及前侧面的化涂层上辊涂防腐耐污涂层涂料，厚度15μm，于75℃热风干燥，得防腐耐污涂层；在后侧面的化涂层上部涂覆聚氨酯胶水，湿膜厚度为25μm，于220℃固化，得聚氨酯胶粘层；于220℃在胶粘层上贴覆PET膜，厚度25μm；将硬化保护涂层涂料与稀释剂以3∶2的质量比混合均匀后涂覆于PET膜上，于65℃热风干燥，UV固化，紫外线强度为200mW/cm2，得厚度15μm的硬化保护涂层，制得成品，收卷。
成品性能测试
依据国标，对实施例2所制半覆膜电视机金属背板的防腐耐污涂层和硬化保护涂层的部分性能指标进行测试。测试结果参见表2。
表2 涂层性能测试结果
由上表数据可知，本发明半覆膜电视机金属背板的防腐耐污涂层具有理想的导电性和防腐性，而其硬化保护涂层与PET基材附着力良好，抗冲击强度和硬度高，性能稳定，保护性好。
如无特殊说明，以上实施例所使用的原料和试剂均为市售通用产品。
可以理解的是，以上关于本发明的具体描述，仅用于说明本发明而并非受限于本发明实施例所描述的技术方案。本领域的普通技术人员应当理解，仍然可以对本发明进行修改或等同替换，以达到相同的技术效果；只要满足使用需要，都在本发明的保护范围之内。

Claims (10)

1.一种薄型半覆膜电视机金属背板，包括安装在电视机后侧的镀锌钢板基材，其特征在于：所述镀锌钢板基材后侧面层叠有化涂层，所述化涂层后侧面上部依次层叠有聚氨酯胶粘层、覆膜层和硬化保护涂层，所述化涂层后侧面下部层叠有防腐耐污涂层；所述镀锌钢板基材前侧面依次层叠有所述化涂层和所述防腐耐污涂层；所述化涂层为铬酸盐化学预处理液成膜；
所述硬化保护涂层以重量份数计包括以下组分：
将所述二官能度聚氨酯丙烯酸酯、2-羟基-3-苯氧丙基丙烯酸酯搅拌混匀，得预混料；向该预混料中加入所述硅氧烷流平剂、所述丙烯酸酯化二苯甲酮、所述乙酸乙酯和所述乙酸丁酯，搅拌混匀，得混合料；450目尼龙滤网过滤，即得硬化保护涂层涂料；
所述防腐耐污涂层以重量份数计包括以下组分：
将所述水溶性有机硅改性丙烯酸树脂，所述丙二醇，硅溶胶和所述硅烷偶联剂进行混合；将所述石墨烯，所述球形硅树脂微粉，所述纳米二氧化铈，所述等份的650目、900目、1300目片型锌粉逐步加入，充分搅拌均匀，得混合物；将所得混合物与所述固化剂混合，即得防腐耐污涂层涂料；
所述薄型半覆膜电视机金属背板具体制备方法如下：
步骤一：用浓度为20～50wt％的铬酸盐化学预处理液对所述镀锌钢板基材前后侧面进行钝化处理，烘干，得所述化涂层；
步骤二：在后侧面的所述化涂层下部以及前侧面的所述化涂层上辊涂所述防腐耐污涂层涂料，于75～80℃热风干燥，得所述防腐耐污涂层；
步骤三：在后侧面的所述化涂层上部涂覆聚氨酯胶水，于220～230℃固化，得所述聚氨酯胶粘层；
步骤四：于220～230℃在所述胶粘层上贴覆所述覆膜层；
步骤五：将所述硬化保护涂层涂料与稀释剂以3∶2的质量比混合均匀后涂覆于所述覆膜层上，于60～65℃热风干燥，UV固化，即得。
2.根据权利要求1所述的薄型半覆膜电视机金属背板，其特征在于：所述石墨烯是通过氧化石墨还原法制得。
3.根据权利要求1所述的薄型半覆膜电视机金属背板，其特征在于：所述镀锌钢板基材厚度为0.8～1.0mm。
4.根据权利要求1所述的薄型半覆膜电视机金属背板，其特征在于：所述聚氨酯胶粘层湿膜厚度为23～25μm。
5.根据权利要求1所述的薄型半覆膜电视机金属背板，其特征在于：所述覆膜层为PVC膜或PET膜，所述PVC膜厚度为0.2mm，所述PET膜厚度为25μm。
6.根据权利要求1所述的薄型半覆膜电视机金属背板，其特征在于：所述硬化保护涂层厚度为10～15μm。
7.根据权利要求1所述的薄型半覆膜电视机金属背板，其特征在于：所述防腐耐污涂层厚度为15～20μm。
8.根据权利要求1所述的薄型半覆膜电视机金属背板，其特征在于：所述硬化保护涂层以重量份数计包括以下组分：
9.根据权利要求1所述的薄型半覆膜电视机金属背板，其特征在于：所述UV固化的紫外线强度为180～220mW/cm2。
10.根据权利要求1所述的薄型半覆膜电视机金属背板，其特征在于：所述铬酸盐化学预处理液浓度为20wt％。
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