共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
改性环氧树脂制备的热固性环氧沥青材料性能 总被引:1,自引:1,他引:1
采用改性环氧树脂和脂肪族多元羧酸固化剂(由C22:三元酸和二聚脂肪酸固化剂复配而成)及石油沥青制备了热固性环氧沥青材料。通过力学性能测试、DSC及扫描电镜研究了沥青含量对环氧沥青固化物拉伸性能、玻璃化温度、固化反应活性及相结构的影响。结果表明,沥青质量分数为44%的环氧沥青固化物的拉伸强度达8.37MPa,断裂伸长率达223.50%,玻璃化温度22.25℃,吸水率为0.2%。随着沥青含量的增加,沥青作为分散相的粒径越来越大,因而环氧沥青材料的拉伸强度降低。沥青含量的增加对固化物的玻璃化温度没有显著的影响。有沥青的环氧固化体系的反应活化能要小于无沥青的环氧固化体系。 相似文献
3.
4.
Gang Tang Ruiqing Zhao Dan Deng Yadong Yang Depeng Chen Bing Zhang Xinliang Liu Xiuyu Liu 《Frontiers of Chemical Science and Engineering》2021,15(5):1269
A phosphine oxide-containing bio-based curing agent was synthesized by addition reaction between furan derivatives and diphenylphosphine oxide. The molecular structure of the as-prepared bio-based curing agent was confirmed by Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. Dynamic mechanical analysis results indicated that with the increase of bio-based curing agent content, the glass transition temperature of epoxy/bio-based curing agent composites decreased, which was related to the steric effect of diphenylphosphine oxide species that possibly hinder the curing reaction as well as the reduction in the cross-linking density by mono-functional N-H. By the addition of 7.5 wt-% bio-based curing agent, the resulting epoxy composite achieved UL-94 V-0 rating, in addition to limiting oxygen index of 32.0 vol-%. With the increase of content for the bio-based curing agent, the peak of heat release rate and total heat release of the composites gradually decreased. The bio-based curing agent promoted the carbonization of the epoxy matrix, leading to higher char yield with good thermal resistance. The high-quality char layer served as an effective barrier to retard the diffusion of decomposition volatiles and oxygen between molten polymers and the flame. This study provides a renewable strategy for fabricating flame retardant and transparent epoxy thermoset. 相似文献
5.
6.
介绍了6种常见的环氧地坪漆的应用范围。讨论了水性环氧地坪漆在建筑物中的涂装前处理、底涂、中涂和面涂的工艺要求。研究了石英砂含量对以不同固化剂固化的环氧中涂层抗压强度的影响。结果表明,使用端氨基聚醚和脂肪胺类固化剂时,当石英砂含量达到85%(质量分数)时,中涂层的抗压强度依然能满足环氧地坪漆的施工要求。地坪漆的性能测试结果证明,新开发的水性环氧地坪漆达到甚至超过了常用的地坪漆的性能指标。 相似文献
7.
新型脂肪族超支化环氧树脂的制备及其改性作用 总被引:1,自引:0,他引:1
采用一步法合成了新型脂肪族超支化环氧树脂HTPE-3,利用FT-IR对其结构进行了表征。研究了双酚A型环氧树脂E-51/HTPE-3杂化树脂的力学性能和热性能。结果显示,杂化树脂的韧性和强度随HTPE-3含量的增加先增加后降低,具有极大值;当HTPE-3质量分数为12%左右时,与纯E-51树脂相比,杂化树脂的冲击强度和断裂韧性分别提高了169.8%和35.2%,拉伸强度和弯曲强度分别提高了6.5%,10.0%,维卡软化点温度、玻璃化转变温度和热分解温度略有下降。 相似文献
8.
9.
环氧树脂拥有诸多优异的性能,被广泛应用于各领域,然而溶剂型环氧树脂越来越难以满足市场对于绿色环保的要求,故寻求将环氧树脂水性化显得颇为关键。详细介绍了机械法、相反转法、化学改性法和固化剂乳化法等水性环氧树脂乳液的制备方法,系统阐述了各种方法的原理和流程,分析总结了影响水性环氧树脂乳液性能的重要因素,详尽地叙述了不同制备方法的优点和缺点,并对其优化和改进方向进行了展望。综述了国内外环氧树脂水性化的最新研究进展,指出了筛选生产配方、优化工艺流程以及有计划地功能性改性等是水性环氧树脂今后的发展趋势。 相似文献
10.
11.
12.
13.
14.
甲基丙烯酸(MAA)和环氧树脂(EP)进行反应后,添加偶氮二异丁腈(AIBN)和丙烯酸异辛酯,合成的含有丙烯酸树脂链段的环氧树脂作为增韧剂,制备成环氧胶膜。改性后的环氧树脂胶膜剪切强度及剥离强度明显提高,DSC测试显示体系的耐热性能损失不大,用红外光谱分析了固化过程及其改性过程中的反应情况。结果表明,改性后的EP制备出的树脂固化物具有良好的力学及耐热性能。 相似文献
15.
16.
17.
18.
19.
20.
The study on toughening and reinforcing of bisphenol-A epoxy resin is one of important developmental direction in the field.
This paper reports a one-pot synthesis of aromatic polyester hyperbranched epoxy resin HTDE-2, an effect of HTDE-2 content
on the mechanical and thermal performance of the bisphenol-A (E51)/HTDE-2 hybrid resin in detail. Fourier transform infrared
(FT-IR) spectrometer, scanning electronic microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis
(TGA), dynamic mechanical thermal analysis (DMA) and molecular simulation technology are used to study the structure of HTDE-2,
performance and toughening and reinforcing mechanism of the HTDE-2/E51 hybrid resin. It has been shown that the content of
HTDE-2 has an important effect on the performance of the hybrid resin, and the performance of the HTDE-2/E51 blends has maximum
with the increase in HTDE-2 content. The impact strength and fracture toughness of the hybrid resin with 9 wt-% HTDE-2 are
almost 3.088 and 1.749 times of E51 performance respectively, furthermore, the tensile and flexural strength can also be enhanced
about 20.7% and 14.2%, respectively. The glass transition temperature and thermal degradation temperature, however, are found
to decrease to some extent.
__________
Translated from Journal of South China University of Technology (Natural Science Edition), 2006: 34(9): 90–94 [译自: 华南理工大学学报 (自然科学版)] 相似文献