高耐盐雾高光泽底面合一水性汽车漆的制备与性能研究
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摘要
以水性环氧酯改性丙烯酸树脂为成膜物,微纳米铁钛粉复合氧化铁黑为防锈颜料,制备了一种光泽高、耐盐雾性能好的底面合一水性汽车漆。研究了不同种类的树脂和防锈颜料,以及催干剂和交联剂的添加量对涂膜耐盐雾性能的影响。在获得的较佳配方上又研究了涂装工艺对漆膜光泽、耐盐雾时间和早期硬度的影响。采用傅立叶变换红外光谱对不同固化条件所得涂膜的结构进行了表征,通过热重法对比分析了不同干燥工艺对涂膜交联固化的影响。结果表明,当催干剂用量为0.4%,色浆细度≤10μm,施工黏度在30 s左右,喷涂厚度为70～80μm时,经80°C烘烤20 min所得涂膜的附着力为0级,耐盐雾时间超过504 h,60°光泽大于80,放置48 h后硬度达到HB。冬季气温低于10°C时,加入1.5%交联剂(XL701)可增加涂膜的干燥性,满足市场需求。
A waterborne primer-topcoat syncretic automotive paint with high gloss and good salt spray resistance was prepared by using a waterborne epoxy ester-modified acrylic resin as film-forming material with micro-nano iron–titanium powder and ferrosoferric oxide as anti-rust pigments. The effects of different resins and anti-rust pigment compositions as well as the amounts of drier and crosslinker on salt spray resistance of the cured film of the paint were studied. Based on the optimized formulation, the effect of curing process on the gloss, salt spray resistance, and early hardness of the films was examined. The structures of the films obtained under various curing conditions were characterized by Fourier-transform infrared spectroscopy. The effects of different drying processes on crosslinking and curing of the film were compared and analyzed by thermogravimetry. The results showed that the film having a thickness of 70-80 μm prepared with 0.4% of drier at a fineness of color paste ≤10 μm and a viscosity about 30 s and baked at 80 °C for 20 min had the following properties: 0-grade adhesion, time to endure salt spray corrosion exceeding 504 hours, 60° gloss more than 80, and hardness up to HB after being placed for 48 hours. The dryness of film is able to be improved by adding 1.5% of XL701 crosslinker to the paint when the temperature is lower than 10 °C in winter, meeting the market demand.
A waterborne primer-topcoat syncretic automotive paint with high gloss and good salt spray resistance was prepared by using a waterborne epoxy ester-modified acrylic resin as film-forming material with micro-nano iron–titanium powder and ferrosoferric oxide as anti-rust pigments. The effects of different resins and anti-rust pigment compositions as well as the amounts of drier and crosslinker on salt spray resistance of the cured film of the paint were studied. Based on the optimized formulation, the effect of curing process on the gloss, salt spray resistance, and early hardness of the films was examined. The structures of the films obtained under various curing conditions were characterized by Fourier-transform infrared spectroscopy. The effects of different drying processes on crosslinking and curing of the film were compared and analyzed by thermogravimetry. The results showed that the film having a thickness of 70-80 μm prepared with 0.4% of drier at a fineness of color paste ≤10 μm and a viscosity about 30 s and baked at 80 °C for 20 min had the following properties: 0-grade adhesion, time to endure salt spray corrosion exceeding 504 hours, 60° gloss more than 80, and hardness up to HB after being placed for 48 hours. The dryness of film is able to be improved by adding 1.5% of XL701 crosslinker to the paint when the temperature is lower than 10 °C in winter, meeting the market demand.
引文
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[11]ALHUMADE H, NOGUEIRA R P, YU A, et al. Role of surface functionalization on corrosion resistance and thermal stability of epoxy/glass flake composite coating on cold rolled steel[J]. Progress in Organic Coatings, 2018, 122:180-188.
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[13]李丽华,杨红兵.仪器分析[M]. 2版.武汉:华中科技大学出版社, 2014.
[2]SINGH A P, GUNASEKARAN G, SURYANARAYANA C, et al. Fatty acid based waterborne air drying epoxy ester resin for coating applications[J].Progress in Organic Coatings, 2015, 87:95-105.
[3]XIAO F J, QIAN C, GUO M Y, et al. Anticorrosive durability of zinc-based waterborne coatings enhanced by highly dispersed and conductive polyaniline/graphene oxide composite[J]. Progress in Organic Coatings, 2018, 125:79-88.
[4]GU B E, HUANG C Y, SHEN T H, et al. Effects of multiwall carbon nanotube addition on the corrosion resistance and underwater acoustic absorption properties of polyurethane coatings[J]. Progress in Organic Coatings, 2018, 121:226-235.
[5]周晓红,任智慧,贾兰英,等.快干水性变速箱车桥防腐涂料的制备[J].中国涂料, 2012, 27(12):20-25.
[6]庄振宇,许飞,胡中,等.基于水性环氧酯的氧化交联型水性工业防腐涂料的制备[J].涂料工业, 2016, 46(11):25-30.
[7]许奕祥,张红,谢唯,等.汽车传动轴用底面合一水性防腐涂料的制备[J].中国涂料, 2016, 31(11):35-39.
[8]姚超,叶凯,左士祥,等.聚苯胺/凹凸棒石与磷钛粉协同型防腐蚀涂料的性能[J].材料保护, 2014, 47(8):63-67.
[9]王磊磊,姚超,吴凤芹,等.聚苯胺/凹凸棒土环氧复合防腐涂料的制备及性能研究[J].涂料工业, 2011, 41(8):34-38.
[10]李家权.复合铁钛粉及其系列防锈漆[J].涂料工业, 2003, 33(7):51-53.
[11]ALHUMADE H, NOGUEIRA R P, YU A, et al. Role of surface functionalization on corrosion resistance and thermal stability of epoxy/glass flake composite coating on cold rolled steel[J]. Progress in Organic Coatings, 2018, 122:180-188.
[12]GOOSSENS V, GOTZEN N, VAN GILS S V, et al. Predicting reflections of thin coatings[J]. Surface and Coatings Technology, 2009, 204(5):551-557.
[13]李丽华,杨红兵.仪器分析[M]. 2版.武汉:华中科技大学出版社, 2014.