共查询到19条相似文献,搜索用时 125 毫秒
1.
2.
3.
4.
介绍了近年来国内外生物可降解聚氨酯(PU)材料的研究现状。按填充型、结构型及其它分类,重点阐述了近年来国内外生物可降解聚氨酯材料的制备方法及取得的进展情况,比较了几种常用生物降解性能测试评价方法的优缺点,总结了当前生物可降解聚氨酯材料存在的问题和今后发展方向。 相似文献
5.
6.
7.
8.
聚氨酯防水涂料的特点与防水性能研究 总被引:1,自引:0,他引:1
聚氨酯防水材料——涂料、灌浆材料、密封材料以及保温防水材料以其高弹性、耐磨性、粘接性、耐低温性、耐溶剂性、耐老化性及可发泡等优良性能得到了迅猛的发展。本文首先介绍了聚氨酯的发展与应用,然后详细介绍了聚氨酯防水涂料的特点与防水性能。 相似文献
9.
本文介绍了聚氨酯泡沫塑料燃烧性能的主要试验方法,通过对我国新旧两套材料燃烧性能分级体系中相关试验方法的比较,指出了旧体系在评价聚氨酯泡沫塑料火灾危险性上存在的不足,同时也讨论了采用新的分级体系来评价聚氨酯泡沫塑料燃烧性能的合理性和科学性。 相似文献
10.
11.
12.
13.
醋酸乙烯-乙烯乳液用于低气味环境友好高性能涂料 总被引:2,自引:0,他引:2
介绍了醋酸乙烯-乙烯(VAE)乳液的技术基础,如VAE乳液的发展、合成技术、化学结构及性能优点。重点研究了在低VOC和低气味的环境友好内墙涂料中,VAE乳液与醋丙乳液、苯丙乳液对涂料性能的影响。结果表明:VAE乳液制备的涂料相对于使用低成膜温度的醋丙乳液涂料,具有更好的低温成膜性能和耐洗刷性能,并且在低PVC(颜料体积浓度)的涂料中具有更好的弹性;VAE乳液制备的涂料相对于低成膜温度的苯丙乳液,具有更好的对比率、低温成膜性和耐洗刷性。电子鼻分析仪的测试结果表明,VAE乳液制备的涂料比使用低气味苯丙乳液制备的涂料气味更低。 相似文献
14.
两种聚氨酯防水涂料的比较 总被引:4,自引:0,他引:4
对焦油型和非焦油水固化型聚氨酯防水涂料B组分的生产工艺、配方特点,施工操作工艺、固化时间、涂膜性能等方面进行了比较,指出新开发的非焦油型聚氨酯涂料生产周期短、能耗少、气味小,是环保型聚氨酯防水涂料。 相似文献
15.
Daniela Wodarczak 《应用聚合物科学杂志》1988,36(2):377-386
The paper presents studies on the influence of temperature and atmosphere composition on the thermal degradation products evolved from flexible polyurethane foam. The experiments have been carried on within the temperature range 200–700°C in air atmosphere and oxygen–nitrogen–helium mixtures. The main volatile toxic products and weight losses during thermal degradation of the polyurethane foam have been determined. The test results have been presented graphically. 相似文献
16.
The study of food repulsion in ungulates is of practical importance for controlling browsing damage to forest trees and agricultural crops. Experiments with domestic sheep assessed the repulsive value of three natural and two synthetic products, using a food-choice situation. Animals were individually presented with two troughs, each containing 30 g of maize, one treated with a chemical product, and the other a control. The odor of domestic dog feces appeared to be highly repulsive, as none of the treated food was eaten, whereas 3 g ±9 and 6 g ±10 were eaten, respectively, of food treated with fetal fluids from sheep and odor of pig feces. Synthetic odors of lion feces and a commercial deer repellent were less efficient as repellents with 11 g ±13 and 14 g ±15 of food eaten, respectively. Habituation to three of the repellents was tested for a minimum of seven successive days. With dog feces, no habituation to the odor was observed. On the contrary, significant habituation (P < 0.05) was observed as early as the third trial for sheep fetal fluids and the fourth trial for the commercial repellent. To test for the effects of social facilitation, groups of four sheep including no, one, or two anosmic animals were presented with food treated with the odor of dog feces. No social facilitation was observed as none of the intact sheep ate any of the food, although the anosmic animals actively ate it throughout the test. In individual food choice tests, the odor of dog feces appeared to be an especially efficient repellent when compared with the other natural or synthetic products. Such repulsion was nearly complete, and neither habituation nor social facilitation could be observed. 相似文献
17.
以桐油(TO)为基本原料,先后经过酯交换反应、磷钨酸季铵盐催化环氧化反应、环氧开环反应生成桐油基阻燃多元醇(TOBP),并将制备的TOBP与异氰酸酯(PAPI)共混通过一步发泡的方式制备得到阻燃型硬质聚氨酯泡沫(FRPUR)。采用傅立叶变换红外光谱和氢谱对产物的结构进行表征,分析结果表明,已成功制备出环氧中间体和TOBP;热重测试结果表明TO、桐油甲酯(TOME)、环氧桐油甲酯(ETOME)和TOBP的热稳定性顺序依次为TOBPETOMETOTOME。通过发泡和极限氧指数、力学强度等测试手段,考察了桐油基PUR泡沫的阻燃性能和力学性能,并与由工业级聚醚多元醇制备的FRPUR硬泡进行比较。分析测试结果表明,由TOBP制备的FRPUR具有良好的阻燃性能和力学性能。 相似文献
18.
Suzana M. Cakić Ivan S. Ristić Milena M-Cincović Nada Č. Nikolić Olivera Z. Ilić Dragan T. Stojiljković Jaroslava K. B-Simendić 《Progress in Organic Coatings》2012
Soft drinks poly(ethylene terephthalate) (PET) bottles were depolymerized by glycolysis with different molar ratio of glycol, such as propylene glycol (PG), triethylene glycol (TEG) and poly(ethylene glycol) (PEG 400), in the presence of a zinc acetate catalyst. These glycolyzed products were characterized by hydroxyl value (HV) determinations. The obtained glycolyzed products were reacted with isophorone diisocyanate (IPDI), dimethylol propionic acid (DMPA), as potential ionic center for water dispersibility, and mixed with ethylene diamine (EDA) as extender chain to prepare polyurethane dispersions. The PET glycolyzed products and polyurethane formation were characterized using Fourier transform infrared spectroscopy (FTIR). The molecular masses distribution of oligoester polyol and polyurethane dispersions were determined by using gel permeation chromatography (GPC). The effect of different PET/glycol molar ratio, on the physico-mechanical properties, such as hardness, adhesion test and gloss of polyurethane films were investigated. Thermal properties were investigated by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). 相似文献
19.
以含30%短玻璃纤维的聚丙烯(PP)为基础,从源头开始控制材料的气味和VOC含量,即将所有可能用到的配料参照大众汽车PV3900气味测试标准进行筛选,优先选择气味等级不超过3级的原料和助剂.主要对当前市场上的几种不同的低气味马来酸酐接枝聚丙烯相容剂(PP-g-MAH)、不同抗氧剂体系和不同气味吸收剂进行了研究.结果表明... 相似文献