首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 234 毫秒
1.
研究了合成β-羟烷基酰胺低温固化耐候粉末涂料用聚酯树脂的配方,讨论了不同单体对树脂Tg、反应性及粉末涂料涂层的机械性能和涂层其他性能的影响。  相似文献   

2.
合成了一种适用于多元苯甲酸缩水甘油酯(PT910)固化的粉末涂料用聚酯树脂,分别讨论了固化剂对粉末涂料玻璃化温度(Tg)的影响、原材料2,6-萘二甲酸(NDA)对聚酯树脂Tg的影响、聚酯合成酸解封端剂对粉末涂料固化活性的影响、树脂黏度对涂料性能以及固化促进剂的影响。  相似文献   

3.
固化促进剂在耐候粉末涂料用聚酯树脂中的应用研究   总被引:1,自引:0,他引:1  
研究了耐候粉末涂料用聚酯树脂合成中固化促进剂的作用;讨论了固化促进剂的选择、加入量、加入时机对树脂性能及涂层固化性能的影响;分析了固化促进剂对不同配方聚酯合成的影响。  相似文献   

4.
合成了一种低温固化粉末涂料用聚酯树脂,测试了树脂酸值和玻璃化温度等理化指标,分别对聚酯树脂粉末涂料进行了抗粉霜性能测试、高压水煮测试和老化测试。通过差示扫描量热仪(DSC)采用不同升温速率对其固化动力学进行了研究;采用Kissinger方程和Crane方程对固化动力学方程参数中的活化能Ea、频率因子A0、反应级数n进行了计算,得到了固化动力学理论方程。该聚酯树脂既满足了低温固化的反应活性,又能保证在低温固化过程中粉末涂料具有良好的流平,由该聚酯制得的由TGIC固化的低温固化粉末涂料具有良好的涂膜性能、优异的抗粉霜性能、良好的耐水和耐候性能。  相似文献   

5.
研究了酸值、酸解剂、功能性单体2,2,4-三甲基-1,3-戊二醇及固化促进剂对聚酯树脂及涂层性能的影响,合成得到了异氰尿酸三缩水甘油酯(TGIC)体系经济型94/6固化粉末涂料用聚酯树脂,同时研究了粉末涂料的固化反应。结果表明:本研究合成的聚酯树脂与常规93/7固化的聚酯树脂反应活化能相当,且固化后涂层的流平、机械性能、耐盐雾、耐水煮及耐候性能方面与之相当。  相似文献   

6.
以聚酯树脂P-5127和环氧树脂E-12为固化主体,添加其它的助剂熔融共混制备低温固化聚酯/环氧粉末涂料。用红外光谱和差示扫描量热法(DSC)研究粉末涂料的固化反应,讨论了固化促进剂2-甲基咪唑(2-MI)用量对粉末涂料固化性能及涂膜性能的影响,确定了2-MI的用量;并对该配方进行非等温动力学分析得出了理论最佳固化温度等固化参数,在此基础上将粉末涂料涂装固化确定实际固化条件。结果表明:粉末涂料中聚酯的端羧基和环氧树脂的环氧基发生反应;随着2-MI用量的增加,固化温度先降低后增加,2-MI的较佳用量为0.4 g;最佳固化条件为:140℃、30 min或是150℃、20 min。  相似文献   

7.
陈唯  顾宇昕  许振阳  何涛  余林  余倩 《涂料工业》2014,44(10):19-21,25
通过熔融聚合法合成了粉末涂料用端羧基型饱和聚酯树脂,并在此基础上接枝了甲基丙烯酸缩水甘油酯(GMA),引入不饱和双键作为活性热固化基团。研究了催化剂浓度对端羧基转化率的影响,采用红外光谱和凝胶渗透色谱表征了双键封端前后分子结构与性能的变化。并将合成的树脂制成粉末涂料,考察其固化后涂层性能。  相似文献   

8.
研究了三羟甲基丙烷(TMP)用量、聚合物分子结构对聚酯树脂及涂料性能的影响;通过加入氢化二聚脂肪酸平衡了聚酯树脂的柔韧性及玻璃化转变温度,合成得到了适合用于β-羟烷基酰胺体系140℃低温固化粉末涂料的聚酯树脂;采用差示扫描量热法(DSC)研究了粉末涂料的固化反应过程。  相似文献   

9.
以对苯二甲酸、间苯二甲酸、新戊二醇、三羟甲基丙烷等为原料合成了一种不含偏苯三酸酐(TMA)的70/30混合型环氧固化饱和聚酯树脂,并研究了合成单体对聚酯树脂性能的影响。将该聚酯树脂制备成粉末涂料,对比了公司另外两款混合型聚酯树脂,进行了涂层成膜物质含量及聚酯消光性能方面的研究。实验结果表明,用该树脂制备的粉末涂层具有良好的流平和机械性能,通过与部分自产树脂性能对比,发现原料TMA对粉末涂料固化活性及耐水煮性能产生较大影响,而在消光性能方面该树脂与同类含TMA的树脂性能差异不大。  相似文献   

10.
粉末涂料     
《涂料技术与文摘》2006,27(9):34-35
用含金属粉末的涂料涂装底材的方法及涂漆件;形成耐热硬涂层的粉末涂料用单萜改性的树脂组合物;含不饱和树脂、磷化合物和胺的辐射固化粉末涂料组合物;粉末涂料用的聚酯树脂及其制备的粉末涂料;防腐和耐湿性好的热固性粉末涂料组合物;减少了VOC产生的Nippon Upica的粉末涂料用聚合物;粉末涂料邦定的生产工艺;[编者按]  相似文献   

11.
Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.  相似文献   

12.
It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.  相似文献   

13.
14.
15.
16.
17.
Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.  相似文献   

18.
收集了2007年7月~2008年6月世界塑料工业的相关资料,介绍了2007~2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.  相似文献   

19.
收集了2005年7月~2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、通用热固性树脂(酚醛、聚氨酯、不饱和树脂、环氧树脂)、特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮)的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。  相似文献   

20.
Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号