CN114714716A - 一种后盖及其制备方法 - Google Patents

一种后盖及其制备方法 Download PDF

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CN114714716A
CN114714716A CN202210353245.7A CN202210353245A CN114714716A CN 114714716 A CN114714716 A CN 114714716A CN 202210353245 A CN202210353245 A CN 202210353245A CN 114714716 A CN114714716 A CN 114714716A
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章颂云
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Dongguan Julong Gaoke Electronic Technology Co ltd
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Abstract

本发明公开了一种后盖及其制备方法，该后盖包括PMMA/PC复合板，所述PMMA/PC复合板的PC侧依次叠设有纹理层、光学镀膜层、油墨层和纤维增强复合材料层，所述PMMA/PC复合板的PMMA侧设有硬化层，所述PMMA/PC复合板的厚度≤125μm，所述纤维增强复合材料层的厚度为200‑300μm。该后盖借助纤维增强复合材料层(厚度为200‑300μm)配合超薄复合板(厚度≤125μm)来获得后盖的工艺，同时匹配UV转印/PVD/丝印等工艺，既可以实现板材炫彩纹理的效果，还能达到较为理想的硬度和耐磨性能，且能够降低产品的厚度，从而可以满足更轻薄的产品设计。

Description

一种后盖及其制备方法
技术领域
本发明涉及电子产品后盖制造技术领域，更具体地涉及一种后盖及其制备方法。
背景技术
随着5G时代的来临，消费类电子产品诸如手机、平板产品后盖因金属对信号的影响而逐渐被淘汰，而PMMA/PC复合板因为其塑胶材料特性不会影响手机信号，通过表面的淋涂等工艺可以实现高的表面硬度(仿玻璃效果)，内层通过UV转印/PVD/丝印等工艺可以实现炫彩的装饰效果因而在手机后盖中广泛采用。目前PMMA/PC复合板塑胶手机后盖普遍采用0.5mm或者0.64mm规格，复合板厚度0.5mm以下时，因为模量低，材料的刚性不够，易变形，所以目前最小的厚度为0.5mm。随着技术发展和消费者对便携式电子产品更高的需求，对后盖等结构件提出更轻、薄的要求，因此开发具备金属材质强度和刚性，具备板材装饰效果的新材料成为热点，以环氧玻纤板为代表的纤维增强复合材料具备跟金属相当的比强度和比模量。当前，玻纤板后盖主要工艺是在玻纤板A面先进行丝印盖底，然后进行转印工艺，再进行物理气相沉积PVD，再丝印中间层，然后在中间层表面转印外纹理层，这种工艺可以实现玻纤材质获取复合板类似的炫彩纹理效果，但是在该工艺中，一方面玻纤纹理难以遮蔽，另一方面因为工艺层直接暴露在外表面(A面)，其可靠性存在较大风险，产品在使用过程中容易出现脱落的现象从而影响整体外观。
发明内容
为了克服现有技术的缺陷，本发明的目的是提供一种后盖及其制备方法，借助纤维增强复合材料层(厚度为200-300μm)配合超薄复合板(厚度≤125μm)来获得后盖的工艺，既可以实现板材炫彩纹理的效果，还能达到较为理想的硬度和耐磨性能，且能够降低产品的厚度(0.5mm以下)，从而可以满足更轻薄的产品设计。
为了实现上述目的，一方面，本发明公开了一种后盖，包括PMMA/PC复合板，所述PMMA/PC复合板的PC侧依次叠设有纹理层、光学镀膜层、油墨层和纤维增强复合材料层，所述PMMA/PC复合板的PMMA侧设有硬化层，所述PMMA/PC复合板的厚度≤125μm，所述纤维增强复合材料层的厚度为200-300μm。
与现有技术相比，本发明的后盖，借助纤维增强复合材料层(厚度为200-300μm)配合超薄复合板(厚度≤125μm)来获得后盖的工艺，同时匹配UV转印/PVD/丝印等工艺，既可以实现板材炫彩纹理的效果，还能达到较为理想的硬度和耐磨性能，且能够降低产品的厚度，从而可以满足更轻薄的产品设计。
另一方面，本发明还公开了一种该后盖的制备方法，包括步骤：
(1)提供PMMA/PC复合板，在所述PMMA/PC复合板的PC侧表面进行UV转印形成纹理层；
(2)在所述纹理层表面进行物理气相沉积形成光学镀膜层；
(3)在所述光学镀膜层表面形成油墨层；
(4)提供纤维增强复合材料层，借助粘合剂实现所述油墨层与所述纤维增强复合材料层复合；
(5)在所述PMMA/PC复合板的PMMA侧涂布硬化液固化后形成硬化层。
较佳地，所述纹理层的厚度为10-20μm。
较佳地，所述光学镀膜层的结构为ZrO/SiO/NbO/SiO/NbO或ZrO/SiO/NbO/In/SiO/NbO。
较佳地，所述光学镀膜层的厚度为30～600nm。
较佳地，所述纤维增强复合材料层选自玻纤板、碳纤板、芳纶纤维板中的一种。
另外，本发明还公开一种后盖，包括PMMA/PC复合板，所述PMMA/PC复合板的PC侧依次叠设有第一纹理层、第一光学镀膜层、保护层、第二光学镀膜层、第二纹理层、油墨层和纤维增强复合材料层，所述PMMA/PC复合板的PMMA侧设有硬化层，所述PMMA/PC复合板的厚度≤125μm，所述纤维增强复合材料层的厚度为200-300μm。在该技术方案中，同时兼具第一纹理层和第二纹理层，且具有第一光学镀膜层和第二光学镀膜层，可形成双纹理及双电镀效果的叠加，实现更多绚丽效果。
相应地，本发明还公开该后盖的制备方法，包括步骤：
(1)提供PMMA/PC复合板，在所述PMMA/PC复合板的PC侧表面进行UV转印形成第一纹理层；
(2)在所述第一纹理层表面进行物理气相沉积形成第一光学镀膜层；
(3)提供纤维增强复合材料层，在所述纤维增强复合材料层表面丝印盖底油墨形成油墨层；
(4)在所述油墨层表面进行UV转印形成第二纹理层；
(5)在所述第二纹理层表面进行物理气相沉积形成第二光学镀膜层；
(6)在所述第二光学镀膜层表面形成透明保护层；
(7)借助粘合剂实现所述保护层与所述第一光学镀膜层复合；
(8)在所述PMMA/PC复合板的PMMA侧涂布硬化液固化后形成硬化层。
较佳地，所述第一光学镀膜层的结构为ZrO/SiO/NbO/SiO/NbO，所述第二光学镀膜层的结构为ZrO/SiO/NbO/SiO/NbO或ZrO/SiO/NbO/In/SiO/NbO。
较佳地，所述油墨层的厚度为30～50μm。
较佳地，所述纤维增强复合材料层选自玻纤板、碳纤板、芳纶纤维板中的一种。
较佳地，所述玻纤板为环氧玻纤板材。
附图说明
图1本发明后盖一实施例的结构示意图。
图2本发明后盖另一实施例的结构示意图。
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，以下结合实施方式详予说明。
请参考图1，本发明提供一种后盖，包括PMMA/PC复合板10，PMMA/PC复合板10的PC侧依次叠设有纹理层11、光学镀膜层12、油墨层13和纤维增强复合材料层14，PMMA/PC复合板10的PMMA侧设有硬化层15，PMMA/PC复合板10的厚度≤125μm，纤维增强复合材料层14的厚度为200-300μm。需要理解的是，后盖产品可以是电子产品后盖，如手机后盖，平板电脑后盖、笔记本电脑后盖等。优选地，PMMA/PC复合板10的厚度可为但不限于80μm、85μm、90μm、95μm、100μm、110μm、120μm、125μm。优选地，纤维增强复合材料层14的厚度可为但不限于为200μm、210μm、220μm、230μm、240μm、250μm、260μm、270μm、280μm、290μm、300μm。
为了获得上述后盖，本发明还提供一种该后盖的制备方法，包括步骤：
(1)提供PMMA/PC复合板10，在PMMA/PC复合板10的PC侧表面进行UV转印形成纹理层11；
(2)在纹理层11表面进行物理气相沉积形成光学镀膜层12；
(3)在光学镀膜层12表面形成油墨层13；
(4)提供纤维增强复合材料层14，借助粘合剂实现油墨层13与纤维增强复合材料层14复合；
(5)在PMMA/PC复合板10的PMMA侧涂布硬化液固化后形成硬化层15。
需要说明的是，对于PMMA/PC复合板10，优选该PMMA/PC复合板10的PMMA层的厚度为30-50μm，如PMMA层的厚度可为但不限于为30μm、35μm、40μm、45μm、50μm。
需要说明的是，纹理层11通过UV转印工艺在PMMA/PC复合板10的PC侧表面形成。优选地，纹理层11的厚度为10-20μm。比如，该纹理层11的厚度可为但不限于10μm、11μm、12μm、13μm、14μm、15μm、16μm、17μm、18μm、19μm、20μm。
需要说明的是，通过PVD(物理气相沉积)工艺在纹理层11表面形成光学镀膜层12，具体地，在纹理层11表面镀上金属、金属氧化物或者其他无机物一种或几种以形成光学镀膜层12。优选地，光学镀膜层12的结构为ZrO/SiO/NbO/SiO/NbO或ZrO/SiO/NbO/In/SiO/NbO，当光学镀膜层12采用ZrO/SiO/NbO/SiO/NbO结构能够实现增亮及绚丽的效果，当光学镀膜层12采用ZrO/SiO/NbO/In/SiO/NbO结构能够实现亮银效果。进一步，光学镀膜层12的厚度为30-600nm。比如，该光学镀膜层12的厚度可为但不限于30nm、100nm、200nm、300nm、400nm、500nm、600nm。
需要说明的是，在光学镀膜层12的表面通过丝印或者喷涂一层油墨形成透明油墨层13，该油墨层13对光学镀膜层12进行保护，防止其氧化，且可采用彩色油墨，实现更绚丽的效果。
需要说明的是，纤维增强复合材料层14为玻纤板、碳纤板、芳纶纤维板中的一种。优选地，玻纤板为环氧玻纤板材，具有良好的比强度和比模量。在纤维增强复合材料层14的一侧或油墨层13表面涂布粘合剂，如OCA胶膜或者LOCA胶水，实现油墨层13与纤维增强复合材料层14复合，优选地，粘合剂层的厚度可为20-50μm。当完成油墨层13与纤维增强复合材料层14贴合后，在PMMA/PC复合板10的PMMA侧涂布硬化液，然后进行热固化或UV固化得到硬化层15。
请参考图2，本发明还提供了另一种结构的后盖，包括PMMA/PC复合板20，PMMA/PC复合板20的PC侧依次叠设有第一纹理层21、第一光学镀膜层22、保护层23、第二光学镀膜层24、第二纹理层25、油墨层26和纤维增强复合材料层27，PMMA/PC复合板20的PMMA侧设有硬化层28，PMMA/PC复合板20的厚度≤125μm，纤维增强复合材料层27的厚度为200-300μm。
需要说明的是，PMMA/PC复合板20的厚度可为但不限于80μm、85μm、90μm、95μm、100μm、110μm、120μm、125μm。优选该PMMA/PC复合板20的PMMA层的厚度为30-50μm，如PMMA层的厚度可为但不限于为30μm、35μm、40μm、45μm、50μm。
需要说明的是，第一纹理层21通过UV转印工艺在PMMA/PC复合板20的PC侧表面形成。优选地，第一纹理层21的厚度为10-20μm。比如，该第一纹理层21的厚度可为但不限于10μm、11μm、12μm、13μm、14μm、15μm、16μm、17μm、18μm、19μm、20μm。
需要说明的是，通过PVD(物理气相沉积)工艺在第一纹理层21表面形成第一光学镀膜层22，具体地，在第一纹理层21表面镀上金属、金属氧化物或者其他无机物一种或几种以形成第一光学镀膜层22。优选地，第一光学镀膜层22的结构为ZrO/SiO/NbO/SiO/NbO，当第一光学镀膜层22采用ZrO/SiO/NbO/SiO/NbO结构能够实现增亮及绚丽的效果。进一步，第一光学镀膜层22的厚度为30-600nm。比如，该第一光学镀膜层22的厚度可为但不限于30nm、100nm、200nm、300nm、400nm、500nm、600nm。
需要说明的是，纤维增强复合材料层27作为支撑结构，其厚度为0.2～0.5mm，如纤维增强复合材料层27的厚度可为但不限于0.2mm、0.3mm、0.4mm、0.5mm，优选为0.2～0.3mm。优选地，纤维增强复合材料层27为玻纤板、碳纤板、芳纶纤维板中的一种。优选地，玻纤板为环氧玻纤板材，具有良好的比强度和比模量。进一步，在纤维增强复合材料层27表面丝印盖底油墨形成油墨层26，该油墨层26的厚度为30～50μm，比如油墨层26的厚度可为但不限于30μm、35μm、40μm、45μm、50μm。然后通过UV转印工艺在油墨层26表面形成第二纹理层25，优选地，第二纹理层25的厚度为10～20μm，比如第二纹理层25的厚度可为但不限于10μm、11μm、12μm、13μm、14μm、15μm、16μm、17μm、18μm、19μm、20μm。
需要说明的是，通过PVD(物理气相沉积)工艺在第二纹理层25表面形成第二光学镀膜层24，具体地，第二纹理层25表面镀上金属、金属氧化物或者其他无机物一种或几种以形成第二光学镀膜层24。优选地，第二光学镀膜层24的结构为ZrO/SiO/NbO/SiO/NbO或ZrO/SiO/NbO/In/SiO/NbO，当第二光学镀膜层24采用ZrO/SiO/NbO/SiO/NbO结构能够实现增亮及绚丽的效果，当第二光学镀膜层24采用ZrO/SiO/NbO/In/SiO/NbO结构能够实现亮银效果。进一步，第二光学镀膜层24的厚度为30-600nm。比如，该第二光学镀膜层24的厚度可为但不限于30nm、100nm、200nm、300nm、400nm、500nm、600nm。
需要说明的是，在第二光学镀膜层24的表面通过丝印光油或者喷涂清漆的方式形成透明保护层23，该保护层23对第二光学镀膜层24进行保护，防止其氧化。
需要说明的是，在保护层23表面或第一光学镀膜层22表面涂布粘合剂，如OCA胶、UV胶水或者LOCA胶水，通过粘合剂实现保护层23与第一光学镀膜层22复合。当完成保护层23与第一光学镀膜层22贴合后，在PMMA/PC复合板20的PMMA侧涂布硬化液，然后进行热固化或UV固化得到硬化层28。
下面通过几个具体的实施例来阐述本发明的后盖的制备方法，但不以此限制本发明的保护范围。
实施例1
一种后盖的制备方法，包括步骤：
(1)提供125μm的PMMA/PC复合板10，PMMA层的厚度为40μm，在所述PMMA/PC复合板10的PC侧表面进行UV转印形成20μm的纹理层11；
(2)在纹理层11表面进行物理气相沉积形成300nm的光学镀膜层12，光学镀膜层12的结构为ZrO/SiO/NbO/SiO/NbO；
(3)在光学镀膜层12表面形成油墨层13；
(4)提供40μm的环氧玻纤板材14，借助粘合剂实现油墨层13与环氧玻纤板材14复合；
(5)在PMMA/PC复合板10的PMMA侧涂布硬化液(PPG ECP600淋涂液)固化后形成硬化层15。
实施例2
一种后盖的制备方法，包括步骤：
(1)提供125μm的PMMA/PC复合板20，PMMA层的厚度为40μm，在所述PMMA/PC复合板20的PC侧表面进行UV转印形成10μm的第一纹理层21；
(2)在所述第一纹理层21表面进行物理气相沉积形成300nm的第一光学镀膜层22，第一光学镀膜层22的结构为ZrO/SiO/NbO/SiO/NbO；
(3)提供40μm的环氧玻纤板材27，在环氧玻纤板材27表面丝印盖底油墨形成30μm的油墨层26；
(4)在所述油墨层26表面进行UV转印形成10μm的第二纹理层25；
(5)在所述第二纹理层25表面进行物理气相沉积形成300nm的第二光学镀膜层24，第二光学镀膜层24的ZrO/SiO/NbO/In/SiO/NbO；
(6)在第二光学镀膜层24表面喷涂清漆形成透明保护层23；
(7)借助粘合剂实现所述保护层23与第一光学镀膜层22复合；
(8)在所述PMMA/PC复合板的PMMA侧涂布硬化液(PPG ECP600淋涂液)固化后形成硬化层28。
对实施例1-2制得的后盖进行硬度和耐磨性能测试，测试结果如表1所示。
其中，测试项目和条件如下：
硬度测试：ASTM D3363标准，采用三菱铅笔及1kg力。
耐刮性能测试：用10mm*10mm钢丝绒摩擦产品表面长30-40mm线,钢丝绒型号为#0000，压力1000g,测试频率：35-50次/分钟，设置摩擦次数诸如500～2500次，判定依据：试验后观察观测装饰片板材表面是否有划痕、磨损等明显异常。
表1硬度和耐磨性能测试结果
试验组 硬度 耐磨性能
实施例1 3H 2500次
实施例2 3H 2500次
从表1的数据可知，通过本发明后盖借助纤维增强复合材料层(厚度为200-300μm)配合超薄复合板(厚度≤125μm)来获得后盖的工艺，同时匹配UV转印/PVD/丝印等工艺，既可以实现板材炫彩纹理的效果，还能达到较为理想的硬度和耐磨性能，且能够降低产品的厚度，从而可以满足更轻薄的产品设计。
以上所揭露的仅为本发明的优选实施例而已，当然不能以此来限定本发明之权利范围，因此依本发明申请专利范围所作的等同变化，仍属本发明所涵盖的范围。

Claims (10)

1.一种后盖，其特征在于，包括PMMA/PC复合板，所述PMMA/PC复合板的PC侧依次叠设有纹理层、光学镀膜层、油墨层和纤维增强复合材料层，所述PMMA/PC复合板的PMMA侧设有硬化层，所述PMMA/PC复合板的厚度≤125μm，所述纤维增强复合材料层的厚度为200-300μm。
2.一种如权利要求1所述的后盖的制备方法，其特征在于，包括步骤：
(1)提供PMMA/PC复合板，在所述PMMA/PC复合板的PC侧表面进行UV转印形成纹理层；
(2)在所述纹理层表面进行物理气相沉积形成光学镀膜层；
(3)在所述光学镀膜层表面形成油墨层；
(4)提供纤维增强复合材料层，借助粘合剂实现所述油墨层与所述纤维增强复合材料层复合；
(5)在所述PMMA/PC复合板的PMMA侧涂布硬化液固化后形成硬化层。
3.如权利要求2所述的后盖的制备方法，其特征在于，所述纹理层的厚度为10-20μm。
4.如权利要求2所述的后盖的制备方法，其特征在于，所述光学镀膜层的结构为ZrO/SiO/NbO/SiO/NbO或ZrO/SiO/NbO/In/SiO/NbO。
5.如权利要求2所述的后盖的制备方法，其特征在于，所述纤维增强复合材料层选自玻纤板、碳纤板、芳纶纤维板中的一种。
6.一种后盖，其特征在于，包括PMMA/PC复合板，所述PMMA/PC复合板的PC侧依次叠设有第一纹理层、第一光学镀膜层、保护层、第二光学镀膜层、第二纹理层、油墨层和纤维增强复合材料层，所述PMMA/PC复合板的PMMA侧设有硬化层，所述PMMA/PC复合板的厚度≤125μm，所述纤维增强复合材料层的厚度为200-300μm。
7.一种如权利要求6所述的后盖的制备方法，其特征在于，包括步骤：
(1)提供PMMA/PC复合板，在所述PMMA/PC复合板的PC侧表面进行UV转印形成第一纹理层；
(2)在所述第一纹理层表面进行物理气相沉积形成第一光学镀膜层；
(3)提供纤维增强复合材料层，在所述纤维增强复合材料层表面丝印盖底油墨形成油墨层；
(4)在所述油墨层表面进行UV转印形成第二纹理层；
(5)在所述第二纹理层表面进行物理气相沉积形成第二光学镀膜层；
(6)在所述第二光学镀膜层表面形成透明保护层；
(7)借助粘合剂实现所述保护层与所述第一光学镀膜层复合；
(8)在所述PMMA/PC复合板的PMMA侧涂布硬化液固化后形成硬化层。
8.如权利要求7所述的后盖的制备方法，其特征在于，所述第一光学镀膜层的结构为ZrO/SiO/NbO/SiO/NbO，所述第二光学镀膜层的结构为ZrO/SiO/NbO/SiO/NbO或ZrO/SiO/NbO/In/SiO/NbO。
9.如权利要求7所述的后盖的制备方法，其特征在于，所述油墨层的厚度为30～50μm。
10.如权利要求7所述的后盖的制备方法，其特征在于，所述纤维增强复合材料层选自玻纤板、碳纤板、芳纶纤维板中的一种。
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CN115464949A (zh) * 2022-09-16 2022-12-13 东莞市聚龙高科电子技术有限公司 曲面玻纤板保护壳的制备方法及曲面玻纤板保护壳

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CN215243479U (zh) * 2021-06-29 2021-12-21 东莞市聚龙高科电子技术有限公司 一种手机后盖

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CN115464949A (zh) * 2022-09-16 2022-12-13 东莞市聚龙高科电子技术有限公司 曲面玻纤板保护壳的制备方法及曲面玻纤板保护壳
CN115416387A (zh) * 2022-10-10 2022-12-02 东莞市聚龙高科电子技术有限公司 一种皮革类后盖及其制备方法

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