CN103233259B - Ctp版材的氧化处理工艺 - Google Patents

Ctp版材的氧化处理工艺 Download PDF

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CN103233259B
CN103233259B CN201310172870.2A CN201310172870A CN103233259B CN 103233259 B CN103233259 B CN 103233259B CN 201310172870 A CN201310172870 A CN 201310172870A CN 103233259 B CN103233259 B CN 103233259B
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ctp plate
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CN103233259A (zh
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李煜
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Huangshan Jinruitai Technology Co ltd
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Hangzhou Jinruitai Technology Co Ltd
Mount Huangshan Rui Thai Polytron Technologies Inc
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Abstract

本发明公开了一种CTP版材的氧化处理工艺,包括一级氧化和二级氧化;其中一级氧化的温度为20~30℃,电流密度为2.5~6.5A/dm2,一级氧化的阴极槽槽液为18~30%的硫酸溶液;二级氧化的温度为15~22℃,电流密度为3.5~7.5A/dm2,二级氧化的阴极槽槽液包含12~20%的硫酸和2~5%的助氧化酸、余量为水;所述的助氧化酸为草酸、酒石酸、磺基水杨酸的一种或几种构成。通过不同条件的一级氧化和二级氧化对铝板进行连续的氧化处理,氧化处理后的铝板表面的氧化膜致密性、厚度和孔隙率等性能优异,制取的CTP版材的保存期长、耐印力高、且显影后不易出现留蓝底和白点的现象。

Description

CTP版材的氧化处理工艺
技术领域
本发明涉及印刷版材生产领域,具体涉及一种CTP版材的氧化处理工艺。
背景技术
CTP版材的生产所采用的工艺大致如下:铝板—除油处理—电解砂目处理—氧化处理—封孔处理—涂布感光液—烘干处理—裁切包装;其中氧化处理是对铝板进行阳极氧化处理,在铝板的表面形成成分为氧化铝的膜层结构(包括厚而疏松的多孔层和薄而致密的阻挡层),实现铝板的亲水功能和保证其上涂覆感光材料的稳定性。
目前所采用的氧化处理工艺大多为一级硫酸阳极氧化工艺,该工艺虽然能够实现在铝板的表面形成氧化膜,但其形成的氧化膜致密性、厚度和孔隙率等性能较差,因此制得的CTP版材的保存期短(约12个月)、感光性能不稳定、显影出现留蓝底或白点等问题、且耐印力低(不足3万印)。
发明目的
本发明的目的在于提供一种CTP版材的氧化处理工艺,经其处理后制得的CTP版材的保存期长、感光性能稳定且耐印力高。
其采取的方案为:一种CTP版材的氧化处理工艺,其是对铝板进行多级阳极氧化,至少包括一级氧化和二级氧化;其中一级氧化的温度为20~30℃,电流密度为2.5~6.5A/dm2,一级氧化的阴极槽槽液为18~30%的硫酸溶液;二级氧化的温度为15~22℃,电流密度为3.5~7.5A/dm2,二级氧化的阴极槽槽液包含12~20%的硫酸和2~5%的助氧化酸、余量为水;所述的助氧化酸为草酸、酒石酸、磺基水杨酸的一种或几种构成。
本申请中通过不同条件的一级氧化和二级氧化对铝板进行连续的氧化处理,氧化处理后的铝板表面的氧化膜致密性、厚度和孔隙率等性能优异,制取的CTP版材的保存期长(约18月)、耐印力高(大于5万印)、且显影后不易出现留蓝底和白点的现象。上述方案中一、二级氧化的阴极槽槽液不同,阳极槽槽液相同。
具体实施时优选按照如下方案进行实施,一、二级氧化中阳极槽槽液均为18~22%的硫酸溶液。一、二级氧化中均使用镀铱的钛网作为给电阳极、极距为55~60cm;使用铝质电极板作为阴极、极距为55~80cm。一、二级氧化中铝板在一、二级氧化的阴极槽中停留时间分别为14.8~16.8s。采用钛网和极距的控制,使得阳极氧化产生的气体能够有效迅速的排出,避免因阳极氧化产生的气体无法迅速排出,而导致铝板表面阳极氧化不均匀现象,保证在铝板表面产生的氧化膜厚度均匀,提高CTP版材成品的质量。另外,本申请中阳极氧化的阳极槽和阴极槽相互独立依次排列设置,且各个阳极槽和阴极槽独立设置槽液供应泵,亦即沿铝板运行方向依次设置一级阳极槽-一级阴极槽-二级阳极槽-二级阴极槽,保证阳极氧化生成的氧化膜具有致密的结构,另外,本申请中提供的电流密度适当,铝板接头经过氧化工艺段时不会出现击穿和烧断的现象,保证生产的安全性和连续性。
具体实施方式
以下通过具体实施例来对本发明的技术方案做进一步解释和说明,但不应理解为对本发明保护范围的限定。
其中,实施例1、2中基板铝板的型号为1060或H18、铝板的宽度为1030mm,铝板运行的速度为15m/min。
实施例1
将电解砂目、除灰处理后的铝板按照下表所示的工艺条件对铝板进行阳极氧化处理
将上述阳极氧化处理后的铝板制成CTP版材,测得阳极氧化处理后形成的氧化膜平均厚度约为3.15g/m2,CTP版材保存期为18个月、耐印力为5~6万印。另外通过向制成的CTP版材表面滴加硫酸铜酸性溶液(PH=1~2)来评价阳极氧化处理后形成的氧化膜的致密性和抗腐蚀性能,滴加硫酸铜酸性溶液后5分钟CTP版材板面不会产生反应,阳极氧化生成的氧化膜的致密性和抗腐蚀性能好。
实施例2
将电解砂目、除灰处理后的铝板按照下表所示的工艺条件对铝板进行阳极氧化处理
将上述阳极氧化处理后的铝板制成CTP版材,测得阳极氧化处理后形成的氧化膜平均厚度约为3.26g/m2,CTP版材保存期为18个月、耐印力为5~6万印。另外通过向制成的CTP版材表面滴加硫酸铜酸性溶液(PH=1~2)来评价阳极氧化处理后形成的氧化膜的致密性和抗腐蚀性能,滴加硫酸铜酸性溶液后5分钟CTP版材板面不会产生反应,阳极氧化生成的氧化膜的致密性和抗腐蚀性能好。
实施例3
将电解砂目、除灰处理后的铝板按照下表所示的工艺条件对铝板进行阳极氧化处理
将上述阳极氧化处理后的铝板制成CTP版材,测得阳极氧化处理后形成的氧化膜平均厚度约为3.22g/m2,CTP版材保存期为18个月、耐印力为5~6万印。另外通过向制成的CTP版材表面滴加硫酸铜酸性溶液(PH=1~2)来评价阳极氧化处理后形成的氧化膜的致密性和抗腐蚀性能,滴加硫酸铜酸性溶液后5分钟CTP版材板面不会产生反应,阳极氧化生成的氧化膜的致密性和抗腐蚀性能好。

Claims (4)

1.一种CTP版材的氧化处理工艺,其是对铝板进行多级阳极氧化,至少包括一级氧化和二级氧化;其中一级氧化的温度为20~30℃,电流密度为2.5~6.5A/dm2,一级氧化的阴极槽槽液为18~30%的硫酸溶液;二级氧化的温度为15~22℃,电流密度为3.5~7.5A/dm2二级氧化的阴极槽槽液包含12~20%的硫酸和2~5%的助氧化酸、余量为水;所述的助氧化酸为草酸、酒石酸、磺基水杨酸的一种或几种构成。
2.如权利要求1所述的CTP版材的氧化工艺,其特征在于:一、二级氧化中阳极槽槽液均为18~22%的硫酸溶液。
3.如权利要求1或2所述的CTP版材的氧化处理工艺,其特征在于:一、二级氧化中均使用镀铱的钛网作为给电阳极、极距为55~60cm;使用铝质电极板作为阴极、极距为55~80cm。
4.如权利要求1或2所述的CTP版材的氧化处理工艺,其特征在于:一、二级氧化中铝板在一、二级氧化的阴极槽中停留时间均为14.8~16.8s。
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