CN113578717A - 一种提高涂塑钢管防腐性能的喷涂方法 - Google Patents

一种提高涂塑钢管防腐性能的喷涂方法 Download PDF

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CN113578717A
CN113578717A CN202110939795.2A CN202110939795A CN113578717A CN 113578717 A CN113578717 A CN 113578717A CN 202110939795 A CN202110939795 A CN 202110939795A CN 113578717 A CN113578717 A CN 113578717A
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steel pipe
spraying
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primer
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廖长生
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Chongqing Dingjiu Pipeline Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
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    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
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Abstract

本发明涉及涂塑钢管生产技术领域,特别涉及一种提高涂塑钢管防腐性能的喷涂方法;包括如下步骤:S1:预处理,S2:底漆喷涂,S3:加强层,S4:面漆喷涂,S5:喷涂完成的钢管冷却并质检,得到成品涂塑钢管。本发明的喷涂方法,能够有效提高喷涂在基材表面上的防腐涂层的附着力,还能够提高底漆与基材、底漆与面漆的结合程度,使涂层的附着力提高,避免了涂层中出现孔隙,增强了涂塑钢管的耐腐蚀性能。

Description

一种提高涂塑钢管防腐性能的喷涂方法
技术领域
本发明涉及涂塑钢管生产技术领域,特别涉及一种提高涂塑钢管防腐性能的喷涂方法。
背景技术
为了使钢管能够有效地阻隔腐蚀物质,通常对钢管的外表面进行防腐处理,来提高其抗腐蚀能力,从而延长钢管的使用寿命,使之更好地应用于海洋工程、石油输送工程等领域。
目前的防腐钢管包括钢管本体和设置在钢管本体外表面上的环氧粉末涂层,其加工方法为:钢管本体先由加热组件加工成高温的钢管本体,再向高温的钢管本体外表面上喷涂一层环氧粉末,使环氧粉末附着在高温钢管本体的外表面上,形成熔结环氧涂层。但是,这种结构的防腐钢管在使用时存在缺陷,环氧涂层的附着力不好,牢固度不高,仍旧存在涂层脱落的问题,无法适用于严苛的使用环境。
为此,提出一种提高涂塑钢管防腐性能的喷涂方法。
发明内容
本发明的目的在于提供一种提高涂塑钢管防腐性能的喷涂方法,以解决上述技术中提出的问题。
为了实现上述目的,本发明的技术方案如下:
一种提高涂塑钢管防腐性能的喷涂方法,包括如下步骤:
S1:预处理,对基材进行喷砂处理,保证其表面平滑,并且其表面清洁度达Sa2.5级,随后将经过打磨的基材表面设置划痕,然后加热至100~125℃;
S2:底漆喷涂,保持温度不变,在基材表面喷涂无溶剂环氧防腐底漆;
S3:加强层,在无溶剂环氧防腐底漆未固化时,将网状纤维均匀包裹在基材上,形成加强层;
S4:面漆喷涂,在加强层外喷涂丙烯酸聚氨酯面漆;
S5:喷涂完成的钢管冷却并质检,得到成品涂塑钢管。
进一步的,本发明涉及的质检工序,对成品涂塑钢管的涂层外观、厚度、管端长度进行质量检测。
进一步的,本发明涉及的冷却采用水冷降温,使得涂塑钢管能够快速冷却。
进一步的,本发明涉及的无溶剂环氧防腐底漆采用四川星利石大涂装材料有限公司生产的环氧富锌重防腐底漆。
进一步的,本发明涉及的丙烯酸聚氨酯面漆采用四川星利石大涂装材料有限公司生产的XLZ-1736丙烯酸耐候防腐涂料。
具体的,所述S1的喷砂处理中采用铸铁砂为磨料,粒径为0.5mm~1.5mm,喷嘴距离基材表面的距离为100mm~200mm,采用0.6~0.9MPa的气压对基材表面进行喷砂,喷砂时长为10~70s,喷砂方向与基材表面法线的夹角为20~30°。
具体的,所述S1的划痕为螺纹形或波浪形,划痕的深度为0.3~0.5cm,划痕的宽度为0.2~0.4cm。
具体的,所述S2的底漆喷涂厚度为300~500μm。
具体的,所述S3的加强层厚度为100~200μm,所述网状纤维为聚丙烯纤维网,所述聚丙烯纤维网表面经过表面微糙化处理。
进一步的,本发明涉及的聚丙烯纤维网采用常州筑威建筑材料有限公司生产的DXB聚丙烯网状纤维,采用的聚丙烯纤维网的长度为19mm,密度为0.91kg/m3,直径<100um,经过表面微糙化处理后,能够提高聚丙烯纤维网与基材表面的牢固度,并且使聚丙烯纤维网充分均匀地分散在无溶剂环氧防腐底漆表面,提高聚丙烯纤维网与无溶剂环氧防腐底漆之间的附着力,在无溶剂环氧防腐底漆表面形成一种乱向支撑体系,分散无溶剂环氧防腐底漆的定向应力,同时,聚丙烯纤维网还作为连接桥梁,进一步增强无溶剂环氧防腐底漆与丙烯酸聚氨酯面漆之间的附着力。
具体的,所述S4的面漆喷涂厚度为300~500μm。
进一步的,本发明涉及的基材在经过烘干处理后1~3h后在进行底漆喷涂,同时,底漆与加强的时间间隔为2~3h,并且,加强与面漆的时间间隔为12~15h。
本发明的有益效果为:
(1)本发明采用喷砂处理,使得基材表面干净无污、无印无痕,满足其表面清洁度达Sa2.5级,使得基材表面的锈皮等污物清除,并在基材表面形成毛面,能够提高基材表面与底漆的结合力;
(2)本发明通过在经过打磨的基材表面设置划痕,结合喷砂处理形成的毛面,能够大大的提高基材表面与底漆的结合力,使得底漆能够更好的粘接在基材表面;
(3)本发明采用网状纤维作为加强材料,一方面,能够均匀地分散在无溶剂环氧防腐底漆表面,提高聚丙烯纤维网与无溶剂环氧防腐底漆之间的附着力,另一方面,聚丙烯纤维网能够作为连接桥梁,进一步增强无溶剂环氧防腐底漆与丙烯酸聚氨酯面漆之间的附着力;
(4)本发明的喷涂方法,能够有效地提高喷涂在基材表面上的防腐涂层的附着力,保证涂层不脱落。
具体实施方式
下面将结合本发明实施例,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅是本发明的一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
一种提高涂塑钢管防腐性能的喷涂方法,包括如下步骤:
S1:预处理,对基材进行喷砂处理,保证其表面平滑,并且其表面清洁度达Sa2.5级,随后将经过打磨的基材表面设置划痕,然后加热至100~125℃;
S2:底漆喷涂,保持温度不变,在基材表面喷涂无溶剂环氧防腐底漆;
S3:加强层,在无溶剂环氧防腐底漆未固化时,将网状纤维均匀包裹在基材上,形成加强层;
S4:面漆喷涂,在加强层外喷涂丙烯酸聚氨酯面漆;
S5:喷涂完成的钢管冷却并质检,得到成品涂塑钢管。
进一步的,本发明的喷涂方法中在底漆与面漆之间设置加强层,增强无溶剂环氧防腐底漆与丙烯酸聚氨酯面漆之间的附着力;另外,聚丙烯纤维网是由多根纤维单丝相互交连而成的网状结构,当无溶剂环氧防腐底漆未固化时,聚丙烯纤维网被挤压撕开成为一根根两头带钩形的单丝且相互牵扣多向分布,增强了聚丙烯纤维网和无溶剂环氧防腐底漆的粘接力,大量聚丙烯纤维在无溶剂环氧防腐底漆中呈三维立体分布,提供网状承托作用,进而改善传统底漆的附着力,从而增强无溶剂环氧防腐底漆与丙烯酸聚氨酯面漆之间的附着力。
进一步的,本发明的喷涂方法中采用铸铁砂为磨料,也可采用石英砂作为磨料,采用0.6~0.9MPa的压缩空气为动力,以形成高速喷射束将铸铁砂高速喷射到基材表面,使基材表面的外表面发生变化,其中,喷嘴距离基材表面的距离为100mm~200mm,喷砂时长为10~70s,喷砂方向与基材表面法线的夹角为20~30°,使得基材表面获得Sa2.5级的表面清洁度以及Ry30~50μm的表面粗糙度,进而提高了基材与涂层之间的附着力,延长了涂膜的耐久性,也有利于涂料的流平和装饰。
进一步的,本发明的划痕为螺纹形或波浪形,相较于传统单个Y形或Z形的划痕,本发明采用连续的划痕,结合喷砂处理形成的毛面,能够大大的提高基材表面与底漆的结合力,使得底漆能够更好的粘接在基材表面,其中,划痕的深度为0.3~0.5cm,划痕的宽度为0.2~0.4cm。
进一步的,本发明的底漆喷涂厚度为300~500μm,其中,底漆喷涂厚度小于300μm时,无法完全盖住毛糙的基材,附着力也不佳;当底漆喷涂厚度大于500μm时,在基材表面易出现流挂现象,影响后续面漆喷涂效果。
进一步的,本发明的面漆喷涂厚度为300~500μm,其中,面漆喷涂厚度小于300μm时,无法完全盖住加强层,附着力也不佳;当面漆喷涂厚度大于500μm时,在加强层表面易出现流挂现象,影响后续面漆喷涂效果,同时还影响凝固时间,影响生产效率。
具体的,本发明的提高涂塑钢管防腐性能的喷涂方法,包括如下步骤:
(1)对基材进行喷砂处理,保证其表面平滑,并且其表面清洁度达Sa2.5级,表面粗糙度为Ry30~50μm;
(2)在经过打磨的基材表面设置划痕,其中,划痕为螺纹形或波浪形,划痕的深度为0.3~0.5cm,划痕的宽度为0.2~0.4cm;
(3)利用清水对基材表面进行冲洗,随后加热至100~125;
(4)经过烘干处理后1~3h后在进行底漆喷涂,无溶剂环氧防腐底漆采用四川星利石大涂装材料有限公司生产的环氧富锌重防腐底漆,底漆喷涂厚度为300~500μm;
(5)在无溶剂环氧防腐底漆未固化时,将网状纤维均匀包裹在基材上,形成加强层,其中,加强层厚度为100~200μm,所述网状纤维为聚丙烯纤维网,所述聚丙烯纤维网表面经过表面微糙化处理,底漆与加强的时间间隔为2~3h;
(6)在加强层外喷涂丙烯酸聚氨酯面漆,面漆喷涂厚度为300~500μm,在无溶剂环氧防腐底漆采用四川星利石大涂装材料有限公司生产的环氧富锌重防腐底漆,并且加强与面漆的时间间隔为12~15h;
(7)喷涂完成的钢管冷却并质检,得到成品涂塑钢管,其中,冷却采用水冷降温,使得涂塑钢管能够快速冷却;质检工序,对成品涂塑钢管的涂层外观、厚度、管端长度进行质量检测。
进一步的,本发明的喷涂方法,能够有效提高喷涂在基材表面上的防腐涂层的附着力,还能够提高底漆与基材、底漆与面漆的结合程度,使涂层的附着力提高,避免了涂层中出现孔隙,增强了涂塑钢管的耐腐蚀性能。
最后说明的是,以上实施例仅用以说明本发明的技术方案而非限制,尽管参照较佳实施例对本发明进行了详细说明,本领域的普通技术人员应当理解,可以对本发明的技术方案进行修改或者等同替换,而不脱离本发明技术方案的宗旨和范围,其均应涵盖在本发明的权利要求范围当中。

Claims (6)

1.一种提高涂塑钢管防腐性能的喷涂方法,其特征在于,包括如下步骤:
S1:预处理,对基材进行喷砂处理,保证其表面平滑,并且其表面清洁度达Sa2.5级,随后将经过打磨的基材表面设置划痕,然后加热至100~125℃;
S2:底漆喷涂,保持温度不变,在基材表面喷涂无溶剂环氧防腐底漆;
S3:加强层,在无溶剂环氧防腐底漆未固化时,将网状纤维均匀包裹在基材上,形成加强层;
S4:面漆喷涂,在加强层外喷涂丙烯酸聚氨酯面漆;
S5:喷涂完成的钢管冷却并质检,得到成品涂塑钢管。
2.根据权利要求1所述的一种提高涂塑钢管防腐性能的喷涂方法,其特征在于,所述S1的喷砂处理中采用铸铁砂为磨料,粒径为0.5mm~1.5mm,喷嘴距离基材表面的距离为100mm~200mm,采用0.6~0.9MPa的气压对基材表面进行喷砂,喷砂时长为10~70s,喷砂方向与基材表面法线的夹角为20~30°。
3.根据权利要求1所述的一种提高涂塑钢管防腐性能的喷涂方法,其特征在于,所述S1的划痕为螺纹形或波浪形,划痕的深度为0.3~0.5cm,划痕的宽度为0.2~0.4cm。
4.根据权利要求1所述的一种提高涂塑钢管防腐性能的喷涂方法,其特征在于,所述S2的底漆喷涂厚度为300~500μm。
5.根据权利要求1所述的一种提高涂塑钢管防腐性能的喷涂方法,其特征在于,所述S3的加强层厚度为100~200μm,所述网状纤维为聚丙烯纤维网,所述聚丙烯纤维网表面经过表面微糙化处理。
6.根据权利要求1所述的一种提高涂塑钢管防腐性能的喷涂方法,其特征在于,所述S4的面漆喷涂厚度为300~500μm。
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