共查询到19条相似文献,搜索用时 609 毫秒
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桐油及其衍生物的改性在高分子材料中的应用进展 总被引:6,自引:0,他引:6
综述了4种桐油改性方法并且介绍了桐油及其改性衍生物在高分子材料应用中的主要进展.讨论了桐油的Diels-Alder反应、Friedel-Crafts反应、氧化聚合和烯烃自由基聚合改性反应及聚合机理,在此基础上,对桐油的改性方法及其在高分子材料中的应用前景进行了展望. 相似文献
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《化工进展》2017,(10)
桐油和马来酸酐经Diels-Alder反应形成桐油二酸酐(TM2)、桐油三酸酐(TM3),桐油三酸酐与不同比例的甲基丙烯酸β羟乙酯(HEMA)反应,将桐油三酸酐及其与HEMA反应物中的酸酐官能团水解,合成出含3~6个羧基官能团丙烯酸酯改性的桐油衍生物。产物结构经红外光谱和核磁共振氢谱表征。测定了桐油基衍生物钠盐的表面张力及CMC值,考察了改性桐油基乳化剂对丙烯酸酯类单体及低聚物的乳化性能。结果表明,随着桐油基衍生物中的羧酸钠基团的增加,衍生物的亲水性增强,CMC值呈上升趋势,乳化性能增强。丙烯酸酯改性桐油基衍生物及其复配物可以光固化,可以通过调节光固化体系的组分得到耐水性很好的光固化膜。 相似文献
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制备了高强度酚醛层压布板,并研究了其性能。讨论了桐油改性酚醛树脂和针状硅灰石粉对酚醛层压布板冲击强度和弯曲强度的影响,并对桐油改性酚醛树脂进行了耐热性能分析。研究结果表明,将甲阶酚醛树脂和桐油改性酚醛树脂共混,随着共混树脂中桐油改性酚醛树脂比例的增加,以此为基体树脂制得的酚醛层压布板的冲击强度在横、纵两个方向上均有大幅度提高。与未添加针状硅灰石粉相比,添加针状硅灰石粉酚醛层压布板的冲击和弯曲强度均有提高,横、纵向冲击强度分别提高23.3%,9.1%,弯曲强度分别提高0.4%,5.4%。针状硅灰石粉经偶联活化改性后,与未偶联活化改性针状硅灰石粉相比,添加改性针状硅灰石粉酚醛层压布板的冲击和弯曲强度进一步得到提高,横、纵向冲击强度分别提高3.9%,15.0%,弯曲强度分别提高4.1%,4.0%。350℃之前,桐油改性酚醛树脂能保持比较好的热稳定性;在大于350℃的高温区,桐油改性酚醛树脂较甲阶酚醛树脂的热稳定性下降明显。 相似文献
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R. S. McKinney N. J. Halbrook Ruby E. Oglesbee 《Journal of the American Oil Chemists' Society》1944,21(12):353-357
Summary 1. Tests indicated that best results in yield of crude and filtered oil by an expression procedure are obtained with a tung
meal containing 4.2% moisture and 20% shell.
2. The drying of tung meal using an initial air temperature of 320° F. appeared to adversely affect the yield of filtered
oil from the expeller process.
3. A filtration test was developed for determining the amount of foots in a crude tung oil.
4. It was found difficult to obtain efficient oil expression from tung meals containing filter cake; in one test with this
material the resulting press cake was high in oil content, while in another test the crude tung oil contained about twice
as much foots material as was present in crude tung oil from tung meal containing no filter cake.
5. The expression of tung oil from a tung meal consisting of ground old tung kernels and tung shell was found difficult if
not impossible. This difficulty appeared to be due, at least partly, to the fact that the meal from old kernels will not plasticize
when subjected to heat and pressure. When these kernels were mixed with new kernels no difficulty was experienced in expressing
the tung oil from the meal.
6. Tests indicated that hulling the moist tung fruit in the grove does not interfere with the expression of the oil if the
moist dehulled tung fruits are properly dried before pressing.
7. A process was developed for producing a clear tung oil by treating the crude oil with a chemical agent to precipitate certain
non-oil constituents in the crude tung oil followed by either pressure filtration or centrifugation.
8. When tung oil filter cake was mixed with an equal amount of tung press cake, over 98 percent of the oil could be solvent-extracted
by petroleum solvents.
Presented at the American Oil Chemists’ Society meeting, New Orleans, La., May 10–12, 1944. Some of the material was presented
at the American Tung Oil Association meeting. Pensacola, Fla., April 28–29, 1944, and published in the proceedings.
Agricultural Chemical Research Division Contribution No. 145. 相似文献
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This paper tries to connect the structure of tung oil and tricresyl phosphate modified phenolic paper-base laminates used for printed circuit boards in a large scale, with properties of these laminates by means of dynamic-mechanical analysis and dielectric measurements. The internal plasticization of tung oil is discussed. The modification of phenolic resin with tung oil causes in addition to flexibilisation, that a higher conversion of functional groups during the resit formation is attained by removal of steric hindrances, in this way the degree of cross-linkage is increased in comparison to the unmodified laminate. The measurements show that tricresyl phosphate is an external plasticizer which reduces the intermolecular interactions. 相似文献
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B. M. Kopacz 《Journal of the American Oil Chemists' Society》1968,45(4):285-288
This paper reviews utilization research on tung oil conducted at the Southern Regional Research Laboratory in New Orleans.
The tung oil program began with the inception of the Laboratory in 1940. Utilization research on tung oil has been concerned
with exploratory chemical reactions to develop new or improved industrial products and with the development of improved paint
formulations. The emphasis of the domestic and foreign extra-mural program supervised by this Laboratory has been aimed at
the practical applications of tung oil in plastics and the effects of heat on tung oil. Accomplishments over the past few
years in these areas are described, and some projection for future research needs are proposed.
Presented at AOCS Meeting, New Orleans, May 1967.
So. Utiliz. Res. Dev. Div., ARS, USDA. 相似文献
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采用超临界二氧化碳(SC-CO_2)萃取技术对从桐籽中提取桐油的工艺进行了研究,考察了物料粒径、萃取温度、萃取压力等对桐油提取率的影响并得到适宜的操作条件.结果表明.优化条件下桐油提取率达到55.16%,桐油回收率达到91%.还利用SC-CO_2萃取桐油的实验数据求得了桐油在SC-CO_2中的溶解度,并用Chrastil方程对溶解度数据进行关联.在30~50℃和25~55 MPa条件下,桐油在SC-CO_2中的溶解度为0.004~0.026 g/L.Chrastil方程关联的平均相对误差为8.41%. 相似文献
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酚醛树脂高性能化改性研究进展 总被引:45,自引:1,他引:44
介绍了酚醛树脂增韧、耐热改性研究及改性后的高性能酚醛树脂作为摩擦材料的应用。增韧改性方法包括 :橡胶改性 ,腰果壳油改性 ,热塑性树脂改性 ,桐油改性 ,新型固化剂改性 ,马来酰亚胺改性及腰果壳油 /双马来酰亚胺复合改性 ;而耐热改性方法包括 :胺类改性 ,硼酸改性 ,芳烃改性 ,钼改性 ,聚酰亚胺改性 ,磷改性 ,苯并嗪化合物改性及氰酸酯化改性 相似文献
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Yukio Yoshimura 《应用聚合物科学杂志》1984,29(9):2735-2747
Investigation was made on the mechanism of polymerization in reactions of tung oil and phenols in the presence of an acid catalyst. It was made by means of comparative HLC and NMR analyses of the products of tung oil self-polymerization, other varied vegetable oil-various phenol reactions, and tung oil-various-in-functionality phenol reactions under given conditions. As a result, it was confirmed that polymerization in reactions of tung oil and phenols is attributed not to tung oil self-polymerization but to di- or trialkylation, with tung oil, of phenols, which can serve as crosslinking agents of tung oil. 相似文献