CN113151745A - 一种耐酸碱腐蚀的镀铝锌预涂层板及其制造方法 - Google Patents
一种耐酸碱腐蚀的镀铝锌预涂层板及其制造方法 Download PDFInfo
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- CN113151745A CN113151745A CN202110500142.4A CN202110500142A CN113151745A CN 113151745 A CN113151745 A CN 113151745A CN 202110500142 A CN202110500142 A CN 202110500142A CN 113151745 A CN113151745 A CN 113151745A
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- coating
- acid
- zinc
- aluminum
- epoxy resin
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- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
本发明公开了一种耐酸碱腐蚀的镀铝锌预涂层板及其制造方法,属于金属材料表面处理领域。预涂层板包括基板,所述基板为镀铝锌基板,基板的正面和/或背面依次涂覆有钝化膜、改性环氧树脂底漆层、改性高耐久聚酯面漆层;其中,所述改性环氧树脂底漆层中包括改性环氧树脂,改性环氧树脂中含有羟基和醚键,羟基和醚键的摩尔比为7:3;所述改性高耐久聚酯面漆层中包括改性高耐久聚酯,改性高耐久聚酯包括1/3的环己烷,其余为由脲醛树脂、聚酰亚胺树脂以及醇酸树脂冷拼改性而成的主体树脂;且通过制备工艺控制,得到的涂层板表面质量良好,板面无凹坑、孔洞,满足建筑彩涂表面质量要求,且耐酸碱性能大幅提升。
Description
技术领域
本发明属于金属材料表面处理领域,涉及镀铝锌镀层钢带的彩色预涂板的生产工艺,具体为一种耐酸碱腐蚀性较强的镀铝锌预涂层板的生产方法。
背景技术
最近几年来,随着建筑细分化程度不断提高,各个领域对建筑围护用彩涂板的个性化需求也在不断提高。像一些化工车间以及猪舍等领域经常接触酸碱等腐蚀性介质,因此在该环境下厂房内部及外部围护用涂层板容易受这些腐蚀性介质入侵而导致涂层表面变色、起泡直至钢板锈蚀。在以往,各领域对彩涂板的专业化及系统化认识并不充分,没有针对性的对不同行业进行实际服役环境进行等级划分,进而去选择更为合理的产品结构用以满足其使用需求。而近年来,随着建筑涂料配方生产技术的提高以及产线涂层生产工艺控制水平的提升,更多的一些新型的预涂层板出现于市场。但是,针对长期接触酸碱(包括强酸碱及弱酸碱)腐蚀性环境的厂房及车间,目前并未见相关专利有公开报道过此方面内容。主要原因有以下几点:一是目前市场并未对腐蚀性环境进行全面细分,因此面对一些服役环境较差的区域,采用较多的仍为高耐久及氟碳等传统性涂层类别。二是用户对产品的了解存在很大局限性,在一定程度上制约了预涂层板在建筑领域的技术革新。三是一些钢企对建筑围护用预涂板的市场定位存在偏差,这就在一定程度上导致产品面向市场后的针对性较差,大大削弱了其产品的市场竞争力。
经检索,中国专利申请号为201710123403.9,申请公开日为2017年6月30日的专利申请文件公开了一种耐腐蚀、耐酸碱彩板制造方法。该制造方法包括如下步骤:步骤1、预处理:以镀锌钢板或者镀铝锌钢板为基板,表面预处理为脱脂清洗;步骤2、初涂:经过预处理之后的带钢进入到化学涂机,在带钢表面涂一层水基铬化物,再进入辊涂机进行初涂:正面底漆高耐蚀聚氨酯底漆,背面底漆高耐蚀环氧底漆;步骤3、精涂:经过初涂后的带钢通过转向辊进入精涂机进行精涂:正面面漆高耐蚀不饱和聚酯漆,背面面漆高耐蚀环氧背漆,该发明方法依托正反面涂层中量产化的纳米颗粒,通过研磨工艺达到纳米状态,超细的纳米颗粒有效的消除大粒径团聚体带来的空隙缺陷,热熔自修复材料消除了常规涂层中溶剂孔道,形成超强封闭能力和耐酸碱能力,延长了彩板的使用寿命。但是,该专利主要是通过添加纳米粒子提高涂层细腻性和抗渗透能力的,这可能会对后期产品耐酸碱性有较大差异。在酸碱溶液腐蚀中,底漆涂层的致密性和耐化学剂反应性影响较为关键,而聚氨酯的抗渗透耐蚀性较差,这将是该对比专利的薄弱点。
中国专利申请号为201510229448.5,申请公开日为2015年7月29日的专利申请文件公开了高耐腐蚀性建筑用彩涂板及其制备方法。该彩涂板包括基板,所述基板为热镀锌板或镀铝锌基板,所述基板的正面和/或背面依次设置钝化层和底漆涂层,所述底漆涂层为改性聚氨酯黄色底漆,所述基板的正面的底漆涂层设有阿克苏超级硅改面漆涂层。但是,该专利在基板属性及现场工艺控制方面没有体现,且该底漆采用改性聚氨酯本身在耐酸碱性上差于本专利,其次在面漆上,其采用超级硅改性涂料,与高耐久涂料在耐蚀性相比也弱,因此,该专利在双重条件下,涂层板整体耐蚀性要差于本专利。
因此,针对一些长期接触酸碱(包括强酸碱及弱酸碱)腐蚀性环境的厂房及车间提供一种新的选材方案,是目前亟需解决的问题。
发明内容
1.要解决的问题
本发明的目的是通过对基板类别及涂料配方进行设计优化,并在产线上对该类产品实现生产工艺的稳定控制,进而生产出一种耐酸碱性较强的镀铝锌涂层板,为今后在相关腐蚀环境领域的选材提供更合理的技术方案。
本发明通过对基板及涂层配方进行设计改良,在原有普通聚酯的基础上明显提高涂层板的耐酸碱腐蚀性,为今后长期接触酸碱腐蚀介质的行业围护选材提供更优的技术方案。
2.技术方案
为了解决上述问题,本发明所采用的技术方案如下:
一种耐酸碱腐蚀性较强的镀铝锌预涂层板,包括基板,所述基板为镀铝锌基板,基板的正面和/或背面依次涂覆有钝化膜、改性环氧树脂底漆层、改性高耐久聚酯面漆层;其中,所述改性环氧树脂底漆层中包括改性环氧树脂,所述改性环氧树脂中含有羟基和醚键,所述羟基和醚键的摩尔比为(9~14):6;所述改性高耐久聚酯面漆层中包括改性高耐久聚酯,改性高耐久聚酯包括1/3的环己烷,其余为由脲醛树脂、聚酰亚胺树脂以及醇酸树脂冷拼改性而成的主体树脂。
值得注意的是,当针对双面涂层耐酸碱腐蚀性均要求较高时,基板的正面依次涂覆有钝化膜、改性环氧树脂底漆层、改性高耐久聚酯面漆层,其背面与正面涂层结构相同;
当针对单面涂层耐酸碱腐蚀性要求较高时,背面底漆为常规的环氧树脂涂层,膜厚控制在5~7μm;其中,背面底漆中环氧树脂主要考虑涂层的发泡性能,耐腐蚀性能要求相对较低;而正面底漆中的改性环氧树脂侧重点在涂层的耐酸碱性上。
进一步地,所述镀铝锌基板中单面镀层的重量大于50g/m2。
进一步地,所述的钝化膜中Cr含量为22~28mg/m2。
进一步地,所述改性环氧树脂底漆层中,其涂料各组分原料及其质量份数为:
改性环氧树脂中将原有部分羟基改性为醚键,醚键比例的提高有助于底漆耐化学品腐蚀提升;另外通过在原有环氧树脂基础上添加部分改性环氧氯丙烷及相应的催化剂,这些树脂采用不干性短有毒醇酸树脂和环氧树脂等相混容而交联固化,具有更好附着性。
其中,改性环氧树脂的制备方法为:
(1)准备反应釜:反应釜配套设有搅拌装置,温度计,将设备清洗后烘干备用;
(2)称重原料:环氧氯丙烷15-20份,改性环氧氯丙烷6-8份,双酚A 3-4份,液碱2-3份,催化剂0.5-1份,稳定剂1-2份,着色颜料30-40份,防锈颜填料10-20份,溶剂5-10份;
(3)先将双酚A与液碱充分搅拌,溶解后再分步加入环氧氯丙烷和改性环氧氯丙烷;再将其缓慢加热至40℃左右;
(4)进一步分步加入催化剂、稳定剂、溶剂及颜料并使其混合均匀;并将该混合液倒入上述反应的溶液中,搅拌均匀,然后缓慢加热至100℃左右,并放置2.5-3小时,使其充分发生反应;
(5)进一步向其加水至中性,再进行脱水则获得改性环氧树脂。该数值漆膜性能良好,附着性、耐候性均好。
进一步地,所述改性环氧树脂底漆层的厚度为7~9μm。
进一步地,所述改性高耐久聚酯面漆层中,其涂料各组分原料及其质量份数为:
其中,所述普通高耐久聚酯树脂中为环己烷单体,用以保证树脂的耐候性以及柔韧性;而改性高耐久聚酯的环己烷单体比例在1/3,其余的主体树脂为脲醛树脂、聚酰亚胺树脂以及醇酸树脂冷拼改性而成;具备较好的耐酸碱性能以及漆膜致密性;改性高耐久聚酯在实际交联固化过程中也会与配方中的普通高耐久聚酯共同融合经过一定温度烘烤后,进行交联固化;另外改性高耐久聚酯也会同时与颜填料进行复合改性、与助剂进行共混改性,使涂层整体耐腐蚀性得到提升。
进一步地,改性高耐久聚酯面漆的制备方法为:
(1)准备反应釜:反应釜配套设有搅拌装置,温度计,将设备清洗后烘干备用;
(2)称重原料:普通高耐久聚酯20-30份,改性高耐久聚酯70-80份,氨基树脂10-15份,混合溶剂5-7份,着色颜料30-40份,流平剂0.07-0.15份,分散剂4-10份,消泡剂0.3-1.0份,耐酸碱腐蚀助剂20-30份。
(3)先将普通高耐久聚酯与改性高耐久聚酯以及氨基树脂充分搅拌,溶解后再将其缓慢加热至50℃左右。
(4)进一步分步加入各类颜填料、助剂、流平剂等并使其混合均匀;并将该混合液倒入上述反应的溶液中,搅拌均匀,然后缓慢加热至120℃左右,放置2小时,使其充分发生反应。
进一步地,所述改性高耐久聚酯面漆层的厚度为15~17μm。
一种上述耐酸碱腐蚀性较强的镀铝锌预涂层板的制备方法,其特征在于:包括如下步骤:
步骤一:镀铝锌基板的制备:将钢坯经过热轧、酸洗、冷轧以及镀铝锌工艺后制成表面质量及板形合格的镀层钢带,即镀铝锌基板(本专利设计铝锌镀层重量为双面不低于100g/m2);
所述钢坯的主要化学成分重量百分比为:C:0.06%~0.30%;Si:≤0.05%;Mn:≤1.30%;P:≤0.025%;S:≤0.02%;Al:≤0.05%,其余为铁和杂质;
所述镀铝锌工艺中:钢带退火温度在700-730℃,镀液温度为590℃,其中,镀液成分:55%Al-43%Zn-1.6%Si;
步骤二:清洗:对镀铝锌基板进行碱洗和漂洗用以去除钢带表面的杂质及油污;
步骤三:钝化处理:经过清洗后的带钢通过挤干辊和气刀,再于25-35℃温度区间及化学辊涂段下对钢带进行钝化处理;经过钝化涂覆后的钢带进入固化炉进行钝化膜烘烤;
钝化膜成分:该钝化膜主要成分为铬酸盐类(氯化铬、硫酸铬等)、氧化剂(硫酸、硝酸等)、络合剂(有机羧酸类)、成膜促进剂、稳定剂、配位剂、柔性剂以及稀土金属等;
进一步地,所述步骤三的化学辊涂段中,因考虑到镀铝锌基板自身镀层原因导致镀层表面存在凹凸质感,因此为保证钝化层以及后续涂层的均匀与平整需对钢带线速度进行模拟,其中,经一系列在线模拟,现拟定针对镀铝锌钢带,其钢带线速度V(单位m/min)满足以下关系:
V=165-0.6a-50b,其中a代表钢板单面镀层重量,单位是g/m2,b代表钢带厚度,单位是mm,得到的V线速度单位为m/min。
因本文涉及的为镀铝锌钢带,考虑到其镀层中含有铝锌化合物导致加工性较镀锌差;且由于其表面存在凹凸质感因此对钝化液成分中添加柔性因子;另外钝化膜厚度对钢板的加工性及附着性也存在一定关系;经对产线涂覆辊辊间压力及涂覆辊速进行模拟得到以下关系:
所述步骤三的化学辊涂段中,涂覆辊辊间压力P满足以下关系:
P=0.4a-0.3V+30,其中,P的单位为KN,a为钢板单面镀层重量,单位为g/m2;V为钢带线速度;
涂覆辊速v满足以下关系:
v=150-0.8a+0.2V,其中v单位为m/min,a为钢板单面镀层重量,单位为g/m2,V为钢带线速度。
步骤四:涂层涂敷:带钢正面和/或背面经过初涂辊涂后进入固化炉进行固化,固化后的钢带在水冷装置下冷却至60度以下,形成改性环氧树脂底漆层,然后进行精涂涂覆,形成改性高耐久聚酯面漆层;本发明所涉及涂层结构包括2/1及2/2两种,这与实际用户需求有较大相关性,膜厚越厚,涂层耐腐蚀性越优异,具体如表1所示:
表1不同膜厚预涂层板耐腐蚀性
正面膜厚/μm | 划线中性盐雾 | 10%GH<sub>3</sub>GOOH | 10%NaOH |
20 | 2000小时 | 400小时 | 360小时 |
30 | 3200小时 | 580小时 | 480小时 |
经中性盐雾检测可知:针对该涂层体系,当正面膜厚为30μm时,耐腐蚀性提高约30%。
但是在生产时需注意,随涂层膜厚提高,底漆膜厚也从5μm提高至10μm左右,在此期间需对固化炉内前三段炉温进行调整以避免因底漆未完全固化导致爆孔或气泡影响涂层表面质量。
其中,涂层结构包括2/1及2/2两种,表2所示,正面涂层包括初涂和精涂两涂层,背面涂层包括单涂层和双涂层两种类型。背面涂层结构当为单涂层时,其涂层类别为环氧树脂;背面涂层为双涂层时其涂层类别与正面相同,该结构主要针对用户对双面涂层耐酸碱腐蚀性均较高区域。带钢经过初涂辊涂后进入固化炉进行固化;固化后的钢带在水冷装置下冷却至60度以下,然后进行精涂涂覆。
表2涂层设计
涂层结构 | 正面膜厚/μm | 背面膜厚/μm |
2/1 | ≥20 | ≥5 |
2/2 | ≥30 | ≥10 |
其中,2/1指正面两涂,背面单涂;2/2指正面两涂,背面两涂。
预涂层板的耐酸碱腐蚀机理:本发明的镀层与钝化层间主要是含铬酸离子与镀层板中的金属发生多相化学反应,镀层直接参与,最终形成铬酸盐类钝化膜物质;钝化膜与涂层间也是各层成分直接发生化学反应进行融合,保证产品耐蚀性和加工性;钝化膜在这三类物质间属桥梁作用,可通过测量Cr的含量范围保证产品各层间附着性。
3.有益效果
相比于现有技术,本发明的有益效果为:
(1)本发明主要通过对基板及涂层配方进行改进,由于镀锌板的耐蚀性较镀铝锌板差,用镀铝锌基板代替原有镀锌基板,在一定程度上提高涂层板基板的耐腐蚀性能;另外,在涂层配方设计方面,通过改变底漆与面漆主体成膜物质属性,并添加能够提高涂层耐腐蚀性的颜填料特殊助剂从而使该预涂板具备良好的耐酸碱腐蚀性溶液渗透性能及综合服役性能;该类产品常规性能指标如表8所示,耐酸碱性能及其余服役性能指标见表9-10;
(2)本发明通过控制钢带速度保证镀铝锌彩涂板板成品表面质量良好,板面无凹坑、孔洞,满足建筑彩涂表面质量要求;
(3)本发明通过对钝化工艺(辊速及辊间张力)控制保证钝化层附着性,经检测Cr含量在22~28mg/m2范围内;
(4)本发明对底漆与面漆成分改良,使产品耐酸碱性能大幅提升。
附图说明
图1为比较例1中涂层板耐盐酸性能结果(5%HCl 96h,起泡);
图2为实施例3中涂层板耐盐酸性能结果(5%HCl 576小时,不起泡);
图3为比较例2中涂层板耐乙酸性能结果(10%CH3COOH 192h,起泡);
图4为实施例3中涂层板耐乙酸性能结果(10%CH3COOH 800h,起泡);
图5为比较例2中涂层板耐氢氧化钠性能结果(10%NaOH 192h,起泡);
图6为实施例3中涂层板耐氢氧化钠性能结果(10%NaOH 288h,起泡);
图7为比较例2中涂层板耐氨水性能结果(28%氨水168h,起泡);
图8为实施例3中涂层板耐氨水性能结果(28%氨水528h,起泡);
图9为比较例1中涂层板耐划线中性盐雾性能(1000小时单侧最大起泡3mm);
图10为实施例3中涂层板耐划线中性盐雾性能(1000小时不起泡);
图11为比较例1中涂层板裸边盐雾性能,1200小时5%红锈;
图12为实施例3中涂层板裸边盐雾性能,2080小时5%红锈;
图13为比较例1与实施例3的耐酸碱性能综合比较结果。
具体实施方式
下面结合具体实施例对本发明进一步进行描述。
具体实施方式中涉及一种耐酸碱性能较强的功能性预涂层板制造方法,具体工艺如下所示。
步骤一、镀铝锌基板的制备:钢坯(主要化学成分重量百分比为:C:0.06%~0.30%;Si:≤0.05%;Mn:≤1.30%;P:≤0.025%;S:≤0.02%;Al:≤0.05%,其余为铁和杂质)经过热轧、酸洗、冷轧以及镀铝锌工艺后制成表面质量及板形合格的镀层钢带,即镀铝锌基板,各实施例的镀铝锌工艺如表3所示;
表3各实施例的镀铝锌工艺
步骤二:清洗:对镀铝锌基板进行碱洗和漂洗用以去除钢带表面的杂质及油污;
表4清洗工艺
工序 | 碱液浓度(%) | 槽液温度(℃) |
脱脂 | 1.2-1.8 | 50-60 |
脱脂 | 0.7-1.5 | 50-60 |
漂洗 | / | 50-60 |
漂洗 | / | 50-60 |
漂洗 | / | 45-55 |
步骤三:钝化处理:经过清洗后的带钢通过挤干辊和气刀,再于25-35℃温度区间及化学辊涂段下对钢带进行钝化处理;经过钝化涂覆后的钢带进入固化炉进行钝化膜烘烤;
表5钝化工艺
表6涂覆工艺参数
步骤四:涂层涂敷:带钢正面和/或背面经过初涂辊涂后进入固化炉进行固化,固化后的钢带在水冷装置下冷却至60度以下,形成改性环氧树脂底漆层,然后进行精涂涂覆,形成改性高耐久聚酯面漆层;本发明所涉及涂层结构包括2/1及2/2两种,这与实际用户需求有较大相关性,膜厚越厚,涂层耐腐蚀性越优异,实施例中以涂层结构为2/1举例说明,工艺流程(2/1涂层结构):镀铝锌板—脱脂—清洗—钝化—正、背面底漆涂覆—固化—正面面漆涂覆—固化—冷却—检验—卷取。
表7涂层涂覆工艺
其中:
实施例1中使用的改性环氧树脂中,羟基和醚键的摩尔比为7:3,其为市售产品:SM731、厂家为三木;
实施例2中使用的改性环氧树脂中,羟基和醚键的摩尔比为6.5:3.5,其为市售产品:SM732、厂家为三木;
实施例3中使用的改性环氧树脂中,羟基和醚键的摩尔比为6:4,为市售产品:SM733、厂家为三木;
实施例1-3中使用的改性高耐久聚酯均为市售的Cymel531、厂家为Allnext产品,检测改性高耐久聚酯产品中环己烷占比为1/3。
检测实施例1~3中,钝化膜的Cr含量分别为24mg/m2,26mg/m2,28mg/m2,表面镀层、钝化膜、涂层三者之间附着性能良好。
如表8-10所示为本发明所得预涂层板的物理性能、耐酸碱性能、耐候性能。
表8预涂层板物理性能
表9预涂层板耐酸碱性能
分析项目 | 耐蚀性能 |
5%盐酸 | ≥300小时不起泡 |
10%乙酸 | ≥300小时不起泡 |
10%氢氧化钠 | ≥300小时不起泡 |
28%氨水 | ≥300小时不起泡 |
表10预涂层板耐候性能
分析项目 | 耐候性能 |
平板中性盐雾性能 | 2000小时涂层不起泡 |
平板划线中性盐雾性能 | 1000小时划线处不起泡 |
裸边中性盐雾性能 | 2000小时裸边处无红锈 |
性能测试
试验涉及两种涂层彩钢板,样板属性如表11所示。
表11试验样板属性
备注:其中比较例1为镀锌板Z180+普通高耐久聚酯涂层彩涂板;
比较例2为镀铝锌板AZ150+普通高耐久聚酯涂层彩涂板;
实施例1/2/3为镀铝锌板AZ150+耐酸碱腐蚀改性涂层彩涂板。
A.耐酸碱性能试验
试验方法:依据《GB/T 13448彩色涂层钢板和钢带试验方法》配置一定量5%HCl、10%CH3COOH、10%NaOH、28%氨水溶液,倒入烧杯。将试样及溶液放入温度为23±2℃的实验室24小时,而后将试验样板放至烧杯,并密封杯口;间隔24小时观察样板表面状态,如表12所示。其中,如图1,比较例1在5%HCl 96h的环境下起泡,图2中实施例3在5%HCl576小时的环境下仍不起泡;图3中比较例2在10%CH3COOH 192h的环境下起泡,图4中实施例3在10%CH3COOH 800h的环境下才起泡;图5中比较例2在10%NaOH 192h的环境下起泡,图6中实施例3在10%NaOH 288h的环境下起泡;图7中比较例2在28%氨水168h的环境下起泡,图8中实施例3在28%氨水528h的环境下起泡。
表12各比较例及实施例耐酸碱性能试验结果
备注:其中比较例1为镀锌板Z180+普通高耐久聚酯涂层彩涂板;
比较例2为镀铝锌板AZ150+普通高耐久聚酯涂层彩涂板;
实施例1/2/3为镀铝锌板AZ150+耐酸碱腐蚀改性涂层彩涂板。
B.耐中性盐雾性能试验
试验方法:依据《GB/T 13448彩色涂层钢板和钢带试验方法》中连续中性盐雾试验的规定,将试样置于盐水喷雾箱开始试验,持续喷雾一定时间后观察试样表面状态,结果如表13所示。
表13各比较例及实施例耐中性盐雾性能结果
序号 | 耐划线中性盐雾性能 | 裸边盐雾性能 |
比较例1 | 1500h,划线起泡 | 700h,裸边起泡 |
比较例2 | 1800h,划线起泡 | 750h,裸边起泡 |
实施例1 | 2500h,划线起泡 | 900h,裸边起泡 |
实施例2 | 2800h,划线起泡 | 1200h,裸边起泡 |
实施例3 | 3200h,划线起泡 | 1500h,裸边起泡 |
结合图9-12所示,图9为比较例1中涂层板耐划线中性盐雾实验,1000小时单侧最大起泡3mm,图10为实施例3中涂层板涂层板耐划线中性盐雾实验,1000小时不起泡。图11为比较例1中涂层板裸边盐雾性能,1200小时5%红锈,图12为实施例3中涂层板裸边盐雾性能,2080小时5%红锈。图13为比较例1与实施例3的耐酸碱性能综合比较结果,其中纵坐标为起泡时间。
本发明所述实例仅仅是对本发明的优选实施方式进行描述,并非对本发明构思和范围进行限定,在不脱离本发明设计思想的前提下,本领域工程技术人员对本发明的技术方案作出的各种变形和改进,均应落入本发明的保护范围。
Claims (10)
1.一种耐酸碱腐蚀的镀铝锌预涂层板,包括基板,其特征在于:所述基板为镀铝锌基板,基板的正面和/或背面依次涂覆有钝化膜、改性环氧树脂底漆层、改性高耐久聚酯面漆层;其中,所述改性环氧树脂底漆层中包括改性环氧树脂,改性环氧树脂中含有羟基和醚键,羟基和醚键的摩尔比为(9~14):6;所述改性高耐久聚酯面漆层中包括改性高耐久聚酯,改性高耐久聚酯包括1/3的环己烷,其余为由脲醛树脂、聚酰亚胺树脂以及醇酸树脂冷拼改性而成的主体树脂。
2.根据权利要求1所述的一种耐酸碱腐蚀的镀铝锌预涂层板,其特征在于:所述镀铝锌基板中单面镀层的重量至少达到50g/m2。
3.根据权利要求1所述的一种耐酸碱腐蚀的镀铝锌预涂层板,其特征在于:所述的钝化膜中Cr含量为22~28mg/m2。
5.根据权利要求4所述的一种耐酸碱腐蚀的镀铝锌预涂层板,其特征在于:所述改性环氧树脂底漆层的厚度为7~9μm。
7.根据权利要求6所述的一种耐酸碱腐蚀的镀铝锌预涂层板,其特征在于:所述改性高耐久聚酯面漆层的厚度为15~17μm。
8.一种权利要求1~7任意一项所述的耐酸碱腐蚀的镀铝锌预涂层板的制造方法,其特征在于:包括如下步骤:
步骤一:镀铝锌基板的制备:将钢坯经过热轧、酸洗、冷轧以及镀铝锌工艺后制成表面质量及板形合格的镀层钢带,即镀铝锌基板;
步骤二:清洗:对镀铝锌基板进行碱洗和漂洗用以去除钢带表面的杂质及油污;
步骤三:钝化处理:在25-35℃温度区间及化学辊涂段下对钢带进行钝化处理;
步骤四:涂层涂敷:带钢正面和/或背面经过初涂辊涂后进入固化炉进行固化,固化后的钢带在水冷装置下冷却至60度以下,形成改性环氧树脂底漆层,然后进行精涂涂覆,形成改性高耐久聚酯面漆层。
9.根据权利要求8所述的一种耐酸碱腐蚀的镀铝锌预涂层板的制造方法,其特征在于:所述步骤三的化学辊涂段中,钢带线速度V满足以下关系:
V=165-0.6a-50b,其中a代表钢板单面镀层重量,单位是g/m2,b代表钢带厚度,单位是mm。
10.根据权利要求9所述的一种耐酸碱腐蚀的镀铝锌预涂层板的制造方法,其特征在于:所述步骤三的化学辊涂段中,涂覆辊辊间压力P满足以下关系:
P=0.4a-0.3V+30;
涂覆辊速v满足以下关系:
v=150-0.8a+0.2V。
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