共查询到19条相似文献,搜索用时 156 毫秒
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介绍了用于双组分水性聚氨酯涂料的羟基丙烯酸酯树脂分散体(A组分)和多异氰酸酯(B组分)的改性进展;综述了丙烯酸酯树脂分散体的活性基、酸值、羟值、玻璃化温度Tg、中和剂、中和度、溶剂以及多异氰酸酯等因素对双组分水性丙烯酸酯聚氨酯涂料性能的影响;提出了双组分水性丙烯酸酯聚氨酯涂料的发展趋势。 相似文献
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以甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(n-BA)、丙烯酸(AA)、甲基丙烯酸羟乙酯(HEMA)、苯乙烯(St)和4-叔丁基环己丙烯酸酯(TBCH)为聚合单体,巯基乙醇(β-ME)为链转移剂,偶氮二异丁腈(AIBN)为引发剂,醋酸丁酯(BAC)为溶剂,采用溶液聚合法合成了一系列低相对分子质量的羟基丙烯酸树脂。以氨基树脂作为固化剂,研究了丙烯酸树脂的羟值、酸值及玻璃化转变温度对制成的氨基烤漆漆膜的摆杆硬度、光泽、耐水性、耐酸性及耐碱性的影响。结果表明,当树脂的羟值(以KOH计)为147 mg/g,酸值(以KOH计)为21 mg/g,玻璃化转变温度为25°C时,所制漆膜的综合性能最佳。 相似文献
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采用几种不同酸值和羟值的丙烯酸树脂与HDI多异氰酸酯制备双组分丙烯酸聚氨酯涂料,研究在高温施工环境下树脂酸值和羟值对双组分聚氨酯涂料适用性和施工性能的影响,同时还探讨了如何消除施工中涂膜的病态,设计了该环境下专用的稀释剂配方。 相似文献
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水性双组分聚氦酯涂料性能研究——丙烯酸树脂分散体对涂膜性能的影响 总被引:2,自引:0,他引:2
丙烯酸树脂分散体作为羟基组分与亲水改性多异氰酸酯配漆,制备水性双组分聚氯酯涂料,研究了丙烯酸树脂分散体的羟值、酸值、玻璃化转变温度等对涂膜性能的影响;用红外光谱仪表征了固化膜的结构,用扫描电镜观察了固化膜的表面形态。结果表明:涂膜的机械性能较好,但耐化学品性和耐水性较差;羟值在100mgKOH/g时性能较好。 相似文献
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通过添加不同量的消光粉或滑石粉制备出不同配方的丙烯酸聚氨酯半光面漆,并研究其光泽稳定性;采用不同配比的高、低羟值丙烯酸树脂拼用制备了丙烯酸聚氨酯半光漆,并研究其光泽稳定性;研究了流平剂对丙烯酸聚氨酯半光漆漆膜光泽的影响。结果表明:采用消光粉消光的丙烯酸聚氨酯半光漆漆膜光泽不稳定;滑石粉对高羟值丙烯酸聚氨酯面漆漆膜消光效果不好,大量添加会降低漆膜的机械性能和耐候性能;流平剂对丙烯酸聚氨酯半光漆漆膜光泽影响轻微;高、低羟值丙烯酸树脂拼用的半光漆光泽最为稳定,且不牺牲其他性能,配方中填料添加量较少。 相似文献
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在催化剂、链支化剂存在下多元酸和多元醇直接熔融酯化、常压缩聚合成饱和羟基聚酯。此树脂对粉末涂料制造工艺适应性强,其结晶度低,数均分子量2000~5000,色泽浅而透明,玻璃化温度较高(53~63℃),软化点适中(95~110℃),酸值3~8,羟值30~45。叙述了聚氨酯粉末涂料的参考配方、涂料性能和施工条件。讨论了羟基聚酯玻璃化温度的调节及影响涂料装饰性和机械性能的主要因素。 相似文献
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结合溶液聚合和乳液聚合的优点,采用两步聚合法合成了一种水性羟基丙烯酸树脂,所制备的水性树脂外观良好,黏度适中。动态光散射结果表明所合成的水性乳液平均粒径为122 nm,粒径分布均匀。利用傅里叶红外光谱(FT-IR)对合成水性树脂的结构进行表征,结果表明得到了预定结构的产物。差示扫描量热仪(DSC)表明两步聚合的产物的玻璃化温度均为30℃左右,与实验设计相符合。利用所合成的水性羟基丙烯酸树脂与氨基树脂R-717配制烘烤型水性清漆,FT-IR谱图验证了固化反应的发生。固化后的水性清漆性能测试结果表明,漆膜光泽高、硬度高、附着力好,耐冲击性能优异,耐水性和耐乙醇性较好,与国外同类产品制得的清漆性能相当,可应用于车架、机械零部件及卷尺等工业防腐装饰领域。 相似文献
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聚合方法对水性羟基丙烯酸树脂及相应2K-WPU性能的影响 总被引:1,自引:0,他引:1
分别通过溶液聚合、乳液聚合和两步聚合法制备了3种水性羟基丙烯酸树脂(PAS、PAE、PAT),采用傅里叶变换红外光谱(FT-IR)、动态光散射(DLS)和示差扫描量热法(DSC)对所合成树脂进行了表征。在无催化剂存在的条件下,分别将3种水性树脂与异氰酸酯固化剂Bayhydur XP 2655以及助剂混合得到双组分水性聚氨酯清漆,通过红外光谱对固化后清漆结构进行了表征,并对3种水性清漆的性能进行了研究。实验结果表明基于PAT的水性清漆综合性能较优。 相似文献
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The carboxyl group-containing acrylic resin for powder coatings can be obtained by succinic anhydride reacting with hydroxyl group-containing acrylic resin, which was prepared by radical copolymerization of methyl methacrylate (MMA), n-butyl methacrylate (BMA) and β-hydroxypropyl methacrylate (HPMA) using 2,2′-azobisisobutyronitrile (AIBN) as initiator in toluene solution. The influence of synthesis method, weight ratio of monomers, and the amount of succinic anhydride on carboxyl group-containing acrylic resin was investigated. The 1H NMR results reveal that carboxyl group was successfully attached to acrylic resins. The optimum monomer weight ratio is MMA:BMA:HPMA = 65:20:15. The acid value of resin increases with the increasing of the amount of succinic anhydride, while the Tg of resin decreases. 相似文献
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H. P. Higginbottom G. R. Bowers P. E. Ferrell L. W. Hill 《Journal of Coatings Technology》1999,71(894):49-60
Melamine-formaldehyde (MF) resins have been used as crosslinkers for hydroxyl-functional coreactants in thermoset coatings
for about 60 years. Crosslink densities of films prepared from oligomeric urethane polyols suggested that the methoxymethyl
groups of MF resins could react with urethane groups (i.e., secondary carbamate groups) as well as reacting with hydroxyl
groups. Co-reactants that contain secondary carbamate groups and no hydroxyl groups have been prepared with several types
of backbone structures. Cure of such co-reactants by MF resins has been studied using a gradient oven with determination of
impact resistance, solvent resistance, and hardness. Several formulations from these cure profile sets have been selected
for crosslink density determinations by dynamic mechanical analysis (DMA). Crosslink densities of cured films are consistent
with complete conversion of secondary carbamate groups at temperatures only slightly higher than those used for cure of hydroxyl
groups. The -OH groups on certain acrylic polyols were converted to secondary carbamate groups. The original acrylic and the
converted acrylic were both cured with MF resins. Acid resistance was much better for films prepared from the acrylic that
contained secondary carbamate groups.
Presented at the 25th International Waterborne, High-Solids, and Powder Coating Symposium, New Orleans, LA, Feb. 18–20, 1998.
730 Worcester Street, Springfield, MA 01151. 相似文献
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