改性三聚氰胺甲醛树脂漆雾凝聚剂的研制及性能研究     

曾德芳  徐浪  刘俊 《彭城职业大学学报》2014,(3):30-34

以三聚氰胺、甲醛为原料制得的三聚氰胺甲醛树脂为消粘剂,以改性聚丙酰胺为凝聚剂,开发出一种能用于油性漆喷涂房循环水处理的新型高效漆雾凝聚剂．通过漆雾凝聚剂合成工艺的正交实验,确定了该漆雾凝聚剂最佳反应物质量比、反应温度和反应时间等因素．在制备过程中通过加入阻聚剂对三聚氰胺甲醛树脂进行改性,能够有效地提高稳定时间．改性之后漆雾凝聚剂的漆渣去除率能达到88．87％,存储时间也能达到180d左右,能满足生产以及运输要求．  相似文献   

高硬度等离子弧粉末堆焊层的纤维纵向强化   总被引：1，自引：0，他引：1  

王惜宝  张文钺 《天津大学学报(英文版)》2000,6(2):157-161

研究一种用于高硬度等离子弧堆焊层纵向强化的纤维强化法 .通过对纤维增强等离子弧堆焊层的制备工艺及纤维加入量对堆焊层纵向断裂韧性的影响研究 ,发现选择具有高熔点和高强度的 W-Mo合金纤维作为堆焊层的增强纤维不仅具有较好的工艺可操作性 ,而且具有明显的增强作用 .在成分 (质量分数 )为 F e-2 0 % B4C复合粉末等离子弧堆焊层中加入体积分数为 4.8%的 W-Mo合金纤维 ,即可使堆焊层的纵向断裂韧性提高 3 3 .5 % .  相似文献   

Preparation and properties of Tung oil-based polyurethane     

袁才登  赵晓明  邵丽英  唐克华 《天津大学学报(英文版)》2014,20(4):273-281

Tung oil-based polyols were synthesized by the esterification and transesterification between Tung oil-based anhydride and butanediol. The hydroxyl values of the polyols prepared were tested and discussed. Polyurethane was prepared by using Tung oil-based polyols and/or poly （propylene glycol） as polyols and by using isophorone diisocyanate as isocyanate. The effect of the ratio of Tung oil-based polyols to poly （propylene glycol） on the proper- ties of polyurethane prepared was investigated by the water resistance, alcohol resistance and hardness tests. The results show that Tung oil-based polyols are effective to improve the hardness, water resistance and alcohol resistance of polyurethane.  相似文献   

Fast evaluation of degradation degree of organic coatings by analyzing electrochemical impedance spectroscopy data   总被引：3，自引：0，他引：3  

夏大海  宋诗哲  王吉会  毕慧超  韩哲文 《天津大学学报(英文版)》2012,18(1):15-20

The degradation coefficient is proposed to evaluate the degradation degree of organic coatings by directly analyzing the Bode plots of the electrochemical impedance spectroscopy (EIS) data.This paper investigated the degradation of phenolic epoxy coating/tinplate system by EIS and the degradation coefficient value,which correlates well with the results of breakpoint frequency and variation of phase angle at 10 Hz.Furthermore,the degradation process was confirmed by scanning electron microscope (SEM) and scanning probe microscopy (SPM).It is concluded that degradation coefficient can be used for the fast evaluation of degradation degree of organic coatings in practical applications.  相似文献   

Degradation process of coated tinplate by phase space reconstruction theory     

石江波  夏大海  王吉会  周超  刘彦宏 《天津大学学报(英文版)》2013,19(2):92-97

The degradation process of organosol coated tinplate in beverage was investigated by electrochemical noise (EN) technique combined with morphology characterization.EN data were analyzed using phase space reconstruction theory.With the correlation dimensions obtained from the phase space reconstruction,the chaotic behavior of EN was quantitatively evaluated.The results show that both electrochemical potential noise (EPN) and electrochemical current noise (ECN) have chaotic properties.The correlation dimensions of EPN increase with corrosion extent,while those of ECN seem nearly unchanged.The increased correlation dimensions of EPN during the degradation process are associated with the increased susceptibility to local corrosion.  相似文献   

A Planned and Preventive Conservation Project for The Tarot Garden by Niki de Saint Phalle     

Serena Vella  M. Carolina Gaetani  Ulderico Santamaria 《文物保护研究》2018,63(5):431-434

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Influence of hydroxypropyl methylcellulose edible coating on fresh-keeping and storability of tomato     

庄荣玉  黄耀文 《浙江大学学报(A卷英文版)》2003,4(1):109-113

The effect of application of cellulose-based edible coating, hydroxypropyl methylcellulose (HPMC) to mature-green tomatoes on the firmness and color was investigated. Tomatoes were stored at 20°C for up to 18 days. Firmness decreased as storage time increased in all treatments. However, application of HPMC edible coating delayed softening of tomatoes during 18 days of storage at 20°C. At days 7, 13 and 18, the firmness of tomatoes coated with HPMC was significantly (P≦0.05) greater than the firmness of uncoated tomatoes. The study also confirmed that HPMC coatings could significantly (P≦0.05) delay the changes in color of tomatoes stored at 20°C. The ripening of tomatoes from the pink stage to the red stage was successfully retarded. HPMC coating could extend the shelf life of fresh tomatoes. The retardation of the rate of loss of firmness could reduce the economic loss that would result from spoilage by mechanical injury during transportation of tomatoes. Project partly supported by the Centers for Disease Control and Prevention, U.S. Public Health Service  相似文献   

壳聚糖涂膜对芒果的保鲜效应   总被引：5，自引：0，他引：5  

王伟洲 《宁波职业技术学院学报》2006,10(2):105-107

探讨了不同浓度壳聚糖涂膜剂对芒果生化指标和保鲜效果的影响。结果表明:2%浓度的壳聚糖涂膜剂对芒果呼吸作用有最好的抑制效果,总酸度和酶活性变化最小,腐烂率最低,具有最好的保鲜效果。  相似文献   

纳米SiO₂改性氟碳防锈乳液的制备研究     

王有朋  唐蓉萍  李薇  石星丽  吕维华  罗资琴 《兰州石化职业技术学院学报》2015,(2):6-8

应用纳米SiO2胶体、含单宁酸活性单体、丙烯酸类及含氟单体合成了氟碳防锈乳液。该乳液及其涂膜具有较好的综合性能。该防锈乳液与普通苯丙乳液相比具有更优异的防锈性能和涂膜硬度。  相似文献   

无碳复写纸 CB 涂料中淀粉间隔基的研究     

金惠平 《湖州职业技术学院学报》2015,(1)

采用小麦淀粉进行精制,三聚磷酯钠进行磷酸酯化生产无碳复写纸 CB 涂料淀粉间隔基。试验结果表明：当氢氧化钙用量在0．3－0．4％时,蛋白质含量达到0．3％以下;当上层淀粉取样在70－80％时,粒径在15－25μm 范围的达65％左右,大于40μm 粒径小于1％,;当三聚磷酸钠的加入量为4％,尿素2％时其留着率可达0．8％以上。  相似文献