环氧乳胶涂料适用期的确定（Determination of the applicable period of epoxy latex coatings）

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1、环氧乳胶涂料适用期的确定（Determination of the applicable period of epoxy latex coatings）Pdf documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view.Volume eighth, phase thirty-eighth, August 2008Coating industry PA I & CO

2、AT I NT NGS I STRY NDUV O.L 38 N o 8. Aug 2008.Determination of the applicable period of epoxy latex coatingsGuo Qingquan, Fu Weiqin, Chen Huanqin112(1 、 School of light industry and chemical engineering, Guangdong University of Technology, Guangzhou 5100062, School of chemical and energy engineerin

3、g, South China University of Technology, Guangzhou 510640, China)Abstract: epoxy emulsion coating is a kind of environmental protection coating, but there is a big gap between the reaction performance and the solvent based epoxy coating in the construction process. throughThe two-component system pa

4、int mixing process of epoxy emulsion coatings and solvent in the preparation of viscosity, hardness and gloss variation in the film layer of that due to various reaction mechanisms lead to the applicable period of different epoxy emulsion coatings not recommended by the viscosity and gloss of film t

5、hrough the changes of indicators to reflect the applicable period. Key words: epoxy latex coating; applicable period; viscosity; gloss; hardness; CLC number: TQ 6307; document identification code: B; Article Number: 0253- 4312 (2008) 08- 0045- 03D, eterm, ination, of, Pot, L, ife, of, Epoxy, Em, uls

6、ion, CoatingsGuo, Q, ingquan, Fu, W, eiqin, Chen, huanq, in112(1. Faculty of Chem ical Eng ineering and Ligh t Industry, G uangdong University of T echno logy, Guangzhou 510006, China 2. School of Chem ical; and E nergy Eng ineering, South Ch ina University of T echno logy, Guangzhou 510640, China)A

7、bstract Environm enta l friend ly coating s are the deve Lo PM ent trend in coat ing industry Epoxy EM UL sion coatings as one. Of environ enta l friendly coatings are becom ing m ore and m ore I Po rtance and grow th, m m Qu ickly. But th e perfor ance of epoxy e u lsion coatin GS are still low er

8、than solvent- based products T his m m paper the changes of. Studies V iscosity fil hardness and gloss during the M IX ing process of tw o com ponent, m epoxy EMU lsio n coat ings and so lven t coat ings. T he Po tlife o f these tw o k inds of coatings are different because of th e different curing

9、m echanism. It is suggested that the Po tlife of epoxy EM ulsio n coatings would be deter m in ed by th e change o f f IL g lo ss not by the V Iscosity, m, K, ey, W, ords, epoxy, e, ulsion, coatin, GS, potlife, gloss, hardness, m, V, iscosity;0word1 raw materials and methods11 raw materials and inst

10、rumentsIn developed countries, the development of epoxy emulsion coatings is a kind of water-based paint is relatively mature, while the domestic technology level and living level limit, only in the past few years have been showing rapid development momentum 1- 2. But because of the change of two-co

11、mponent waterborne latex paint curing process is not thorough, the construction mostly rely on the period of application of solvent type epoxy coating, lead epoxy latex coating applications currently on the market are mostly poor performance 3. The applicable period, also known as the activation lif

12、e, is characteristic of two-component or multi component coatings. Its specific meaning is when the composition of the paint is mixed until it can not be used before this time 4. There is also an applicable period for two-component epoxy latex coatings, but they are quite different from the standard

13、 for solvent based epoxy coatings. This study through the two-component epoxy emulsion coatings and two-component solvent based paint curing process of epoxy curing system and in viscosity, different stages of preparation of light comparing the film hardness, color analysis, to determine the charact

14、erization methods of epoxy emulsion coatings for the period.Liquid epoxy resin (EP I KOTETM R esin828): epoxy equivalent of 185 190, bisphenol A diglycidyl ether structure, the United States R company PP; curing agent (EN 105): active amine hydrogen equivalent to 100 110, the United States Rpp compa

15、ny;环 氧 乳 液 (3560 - w - 50): 采 用 ep and kotetm r esin828 液态 环 氧树 脂制 造, 环氧当量 185 190 (固体计), 黏度 (涂 - 4 # 杯 25!) 15 30 固含 量 在 50%, 广 东 力 宝 时 公 司; 水 性 环 氧 固 化 剂 (ep, i curetm 8537 - wy - 60): 水稀 释性胺 加成 物类, 固含 量为 60, 其余是 2 - 丙氧基乙醇、% 醋酸和水, 活性胺氢当量为 174 (固体计), 黏度约 6 000 mp huh? (25.) 美国 r, pp 公司; 乙二醇单甲醚: 上海永

16、生试剂厂. 高速分散搅拌机 570型: 广东茂 兴机械 设备厂; u - 1型 黏度计: brook fie ld 产; 阻尼摆杆 式硬度 仪: 天津材 料试 验仪器 厂; 光泽计: 泉州科仕林光学仪器研究所.作者简介: 张清泉 (1975), 男, 副教授, 博士, 从事功能涂料开发.45郭清泉, 等: 环氧乳胶涂料适用期的确 定1 2 试验方法. 1 2 1 性能测定方法. .黏 度: 按 照 g b / t 9269 1988 测 定; 硬 度: 按 照 gb / t 1730 1993测定, 采用 to 摆, 测定摆杆 从 6 3 # 所用 的时间; 光泽: 采用 gb / t 975

17、4 1988, 按照 60 # 光泽测定.1 2 2 溶剂型环氧涂料黏度和光泽变化. .将溶剂型环氧 树脂 ep ikot etm r esin828 及其配 套固化 剂 en - 105相混合, 保证环氧当量 / 活性胺氢物质的 量的比为 1? 1, 充分混合, 加适量稀释剂乙二醇单 甲醚稀释, 从 开始混 合起 每 0 5 h测定体 系的黏 度, 分别取样, 制 膜, 待 48 h 漆膜彻 底 固化干燥后, 测定涂层光泽.f ig. 2tm图 2 环氧乳胶涂料黏度随时间的变化 changes of the iscosity of epoxy latex coat ings w ith t

18、i m e将环氧乳液 3560 - w - 50和 水性环 氧固化 剂 ep and cu re 8537 - wy - 60混合 后, 体系的黏度由最初的 120 mp? with 一直增加到第 4 5 h的约 1 100 m? the 然后到第 5 h时, 体系 黏度又略有下降.在 体系 整个黏 度变 化范 围内, 都 处于 可以 施工的状态.所以单 从体 系黏度 的变 化来 看, 并不 能确 定环 氧乳胶体系 的适用期 长短.但是取 混合在第 5 h 的试样进行 涂膜测试, 发现 成膜性能已经变差, 漆膜的 状态不 良.说明在 混合后 5 h, 已经过了此环氧乳胶体 系的适用期.这 时随

19、着固 化反应的进行, 分散相环氧树脂相对分 子质量的 逐渐提 高, 其 玻璃化温度也 逐 渐提 高, 甚 至开 始 凝胶 化, 已 经 不能 很 好成 膜, 但是从黏度 指标上看, 并没有 反映出来 所以要寻 找其他 容易观察和测定的指标来反映环氧乳. 胶体系的适用期. 本试验研究的结 果与同 济大 学顾 国芳, 等 的研 究结 果相 左, 顾国芳, 等采用 c only spec ia lity chem. l td 公司 制造的环氧 乳液 pz3961和水性环氧固化剂 h z340进行配漆试验, 得到双 组分混合以 后体 系 的黏 度是 下 降的, 然 后 基本 保 持不 变 6. 本人分

20、析这是因 为所使 用的 体系 不同 的缘 故.顾国 芳, 等研 究中水性环氧清漆体系含有水分 较多, 体系黏度 本来就 较低, 环氧树脂本身处于 被体 系连 续相包 裹的 分散相 中, 可能 导致 双组分混合后黏度 增加 不是 很明显, 或 者因为 有水 的稀 释导 致体系黏度的上升而观测不出来, 相反却有黏度下降的现象.1 2 3 环氧乳胶涂料黏度变化. .将环氧乳 液 3560 - w - 50 和水性 环氧固 化剂 ep and cu re 8537 - w y - 60按比例混 合, 保 证环氧当量? 活性胺 氢物tm质的量的比为 1? 1, 加水稀释, 从开始混合起每 0 5 h测定

21、 体系 的黏度.1, 2, 4 环氧乳胶涂层硬度和光泽变化. .将环氧乳 液 3560 - w - 50 和水性 环氧固 化剂 ep and cu retm 8537 - w y - 60按比例混 合, 保 证环氧? 活性 胺氢物 质的 量的比为 1? 1, 加入适量水调节黏度.From the beginning, mix up every 05 h sampling, coating, 7 days after the film thoroughly cured, dry determination of film hardness and gloss.2 results and disc

22、ussion21 application period of solvent based epoxy systemBoth component reactive coatings have an applicable period. For solvent based epoxy resins, their applicability is usually determined by viscosity changes with time. Figure 1 shows the viscosity of the solvent type epoxy system changes with ti

23、me.23 epoxy emulsion paint film hardness changes with timeThe ordinate in Figure 3 indicates the ratio of the coating hardness to the initial coating hardness at some point.Figure 1 Viscosity of solvent based epoxy system varies with time, Fig 1, C, hanges, viscos, ity, of, solvent-, type, epoxy, co

24、atings, W, ith, of, Ti, e, MAs shown in Figure 1, solvent type epoxy resin system for double mixed components, the viscosity increase is very small, at fifth h after mixing, the viscosity of 1000 mPa? S belongs to the construction range 5, but after 5 h, the viscosity increased sharply, sixth h to 2

25、0000 mPa s? High viscosity has been unable to construction. According to the definition of the applicable period, the applicability of this solvent based epoxy system is about 5 h.22 viscosity of epoxy emulsion coating varies with timeThe change of viscosity of epoxy emulsion coating with time is sh

26、own in figure 2.Figure 3 epoxy emulsion coating hardness with time change, Fig. 3, C, hanges, BarH, ardn, ESS, of, epoxy, latex, fil, W, ith, residen, of, CE, t, I, e, m, MAs can be seen from Figure 3, the hardness of the epoxy emulsion coating increases with the time of placement,Forty-sixGuo Qingq

27、uan, such as: Determination of epoxy emulsion coatings for period showed a downward trend, the decline is relatively uniform, and small, no nature mutation, so the hardness of the coating for index is not the same characterization of epoxy emulsion coatings.3.languageFrom the above analysis, it can

28、be concluded that the application period of emulsion type epoxy resin system can not be determined by the change of viscosity, but the application of some important properties to determine, such as gloss. If the gloss drops to 75% as the end of the application period, the applicable period of the em

29、ulsion type epoxy resin system is about 4 h. Exceed the applicable period, the performance of epoxy latex coating has not truly reflect the nature of epoxy emulsion coatings should be, so in the preparation of the coating, epoxy latex coating are applied in the range of preparation, generally the tw

30、o-component mixing of raw materials after 05 h sample preparation.24 emulsion type and solvent based epoxy coating gloss over timeThe change of gloss between emulsion and solvent based epoxy coatings over time is shown in figure 4.Reference1 JI D ELM ORE, S K I M NCA ID DEREK, C KOMA R PRATA P, et A

31、.l W aterborne epoxy protect ive coat ings form etalJ Journ al of Coat. Ings Technology, 2002, 74 (931): 63 - 72. 2 Guo Qingquan, Chen Huanqin. Preparation of waterborne epoxy resin C paint. The second International Conference on anti corrosion coating technology and development set, Yangzhou: Natio

32、nal Coatings Industry Information Center, 2003 25- 30. Figure 4 solvent and emulsion epoxy gloss with the time variation of F ig. 4 Changes of gloss of solven t- type and w aterborne epoxy fil m w ith res idence t I e m 3 4 Fan Yaping, Ren Tian Bin, Gu Guofang, et al. Waterborne epoxy paint preparat

33、ion and performance of J. Journal of building materials, 200710 (3): 16-. 19, Wang Daquan. Fine Chemical Dictionary M. Beijing: Chemical Industry Press, 1998: 649. Hong Feng Hanbao. Drought stress, chemical coatings M, Beijing: Chemical Industry Press, 20018: 9. - 6 7 Gu Guofang, Chen Ting, Wang Daw

34、u, et al.% type waterborne epoxy resin coatings properties J. chemical building materials, 2001 (3): 16- 20. GI LLHAM J K W, I SANRAKK I G J Th E glass tran sition TEM Pera T. Tu re (T g) as an index of chem ical conversion for a h igh g am ine/ epoxy - T system: chem ical and diffus ion con trolled

35、 reaction K INET ICs J Journal of C. oatings Techn ology, 199062 (783): 35, 5.As can be seen from Figure 4, the gloss of the solvent based epoxy system has almost no change over the entire set time,Until exceeding the applicable period (5 h). While the emulsion epoxy coated gloss in the whole range

36、of time is very different, with the extension of storage time, the coating gloss decreased, and at about fourth h, the gloss of faster decline, at the same time found visual transparency film is getting worse. The difference of the gloss of solvent and emulsion epoxy system with the change of settin

37、g time is due to the different curing mechanism. Compared with the solvent based epoxy system, the curing process of the emulsion type epoxy system is controlled by the diffusion process. It is a complex process with long curing time and incomplete and complete process. 7.Date of receipt2008- 04- 09

38、 (Revised Version)(up to forty-fourth pages)Professional painting can be concentrated in a production plant coating, so that not only conducive to centralized management, more conducive to professional management. The coating of different enterprises focus on third party professional production ente

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43、e increase of the flow of the enterprise. The way to avoid this problem is to do a good job in the process layout planning and regional industrial optimization, rational planning of logistics, so that the production process or supplyWelcome to login & paint industry website: WWW, cn-, PCI, Co, MForty-sevenOne