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概述了植物油基树脂制备方法与原理,讨论了植物油基环保树脂的优势及存在的缺陷。此外,还介绍了植物油基环保树脂在零溶剂或低溶剂树脂、高固体分树脂、水性树脂以及紫外光固化树脂方面的最新研究成果,并分析了植物油基环保型树脂的发展趋势。 相似文献
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以煤沥青为原料、三聚甲醛为交联剂,在对甲苯磺酸的催化作用下合成了沥青树脂(COPNA树脂),通过添加酚醛树脂对其进行了改性;分别以沥青树脂和改性树脂为原料,与石墨混合制备了复合材料。考察了酚醛树脂含量对改性树脂的残炭率、甲苯不溶物含量、喹啉不溶物含量、p树脂含量的影响,以及树脂含量对复合材料的电阻率,肖氏硬度的影响;采用FT—IR和H—NMR研究其反应机理;采用TG研究了沥青树脂和改性树脂的热行为。研究表明,酚醛树脂与沥青树脂可以在一定比例范围内进行复配,在加热混合过程中酚醛树脂与沥青树脂发生化学反应,提高了沥青树脂的耐热性。经酚醛树脂改性的沥青树脂具有更高残炭率、更高β树脂含量和更好耐热性。改性后的树脂复合材料具有更高的电阻率、更高的肖氏硬度和更高的耐磨性。 相似文献
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介绍了多种用于粘胶纤维生产废水锌回收的离子交换树脂及效果,包括强酸阳离子交换树脂、弱酸阳离了交换树脂、膦酸树脂、螯合树脂和阴离子交换树脂。 相似文献
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日本印制板用热固性树脂的进展 总被引:6,自引:0,他引:6
综述了日本近年在印制电路板基材中热固性树脂的发展 ,其中包括 :环氧树脂、酚醛树脂、聚酰亚胺树脂、热固性聚苯醚树脂 ,氰酸酯树脂和特殊热固性树脂。 相似文献
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SAN树脂的相对分子质量对ABS树脂力学性能的影响 总被引:1,自引:0,他引:1
通过将三种不同相对分子质量的SAN树脂与同一种ABS接枝粉料进行熔融共混 ,测试共混物的力学性能 ,比较了三种SAN各自的增韧特性。实验结果表明 :SAN树脂的相对分子质量越高 ,制得的ABS树脂的冲击强度和断裂伸长率越高。SAN树脂的相对分子质量对ABS树脂的拉伸强度没有影响。SAN树脂的低聚物和挥发成分对拉伸强度影响较大。将高相对分子质量SAN和低相对分子质量SAN按不同比例混合后 ,再与ABS接枝粉料以 18份橡胶共混 ,考察了高相对分子质量SAN的加入对共混物冲击强度和熔体流动速率的影响。在SAN树脂中加入高相对分子质量SAN树脂后 ,可以提高ABS树脂的冲击强度 ,显著降低加工流动性 相似文献
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《国际聚合物材料杂志》2012,61(6):309-313
In this study, organo clay-modified alkyd resins were synthesized and these modified alkyd resins were cured with different ratios of melamine formaldehyde resin for the first time. Alkyd resins were blended with 30% and 40% of a commercial melamine-formaldehyde resin. Alkyd-melamine formaldehyde resin films were cured at 140°C for 2 h in an oven. The effect of organo clay addition on the physical and chemical film properties was investigated. These surface coating properties of the resins enhanced with amount of organo clay up to 2–3%. These resins are suitable for manufacturing of high-performance industrial baking enamels. 相似文献
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Anushka E. Vithanage Emtias Chowdhury Luz D. Alejo Paige C. Pomeroy William J. DeSisto Brian G. Frederick William M. Gramlich 《应用聚合物科学杂志》2017,134(19)
Traditional lignin pyrolysis generates a bio‐oil with a complex mixture of alkyl‐functionalized guaiacol and syringol monomers that have limited utility to completely replace phenol in resins. In this work, formate assisted fast pyrolysis (FAsP) of lignin yielded a bio‐oil consisting of alkylated phenol compounds, due to deoxyhydrogenation, that was used to synthesize phenol/formaldehyde resins. A solvent extraction method was developed to concentrate the phenolics in the extract to yield a phenol rich monomer mixture. Phenolic resins were synthesized using phenol (phenol resin), FAsP bio‐oil (oil resin), and an extract mimic (mimic resin) that was prepared to resemble the extract after further purification. All three phenolic sources could synthesize novolac resins with reactive sites remaining for subsequent resin curing. Differential scanning calorimetry and thermogravimetric analysis of the three resins revealed similar thermal and decomposition behavior of phenol and the mimic resins, while the oil resin was less stable. Resins were cured with hexamethylenetetramine and the mimic resin demonstrated improved curing energies compared to the oil resin. The adhesive strength of the mimic resin was found to be superior to that of the oil resins. These results confirmed that extracting a mixture of substituted aromatics from FAsP bio‐oil could synthesize resins with properties similar to those from phenol and improved over the parent bio‐oil. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44827. 相似文献
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Aniline-modified epoxy resin which contains tertiary amine in the middle of the polymer chain was synthesized by the reaction of aniline and epoxy resin. The resulting aniline-modified epoxy resin and two commercial epoxy resins with different epoxy equivalent weights were reacted with 2-ethylhexanol-blocked toluene diisocyanate (2-EH-blocked TDI) to obtain thermally crosslinkable epoxy resins. These epoxy resins were subsequently reacted with various secondary amines and partially neutralized with acetic acid to give thermally crosslinkable cationic resins. The resulting cationic resins were dissolved in suitable solvents and mixed with deionized water to form emulsions. The crosslinking properties, emulsion, and electrodeposition properties of these resins were studied in some detail. The electro-deposition yields of the emulsions prepared from aniline-modified epoxy resins were higher than those of other emulsions. The crosslinked films prepared from aniline-modified epoxy resins were also glossier than those prepared from commercial epoxy resins. High deposition yield and high glossiness were the characteristic properties of the aniline-modified epoxy resins. Thermal properties were not affected by aniline-modified epoxy resins. 相似文献
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烧蚀复合材料用酚醛树脂的结构表征及性能 总被引:1,自引:0,他引:1
采用FTIR、GPC、DSC及TG等方法对4种烧蚀复合材料用酚醛树脂(钨酚醛树脂(WPR)、硼酚醛树脂(BPR)、高残炭酚醛树脂(HCYPR)、S-157酚醛树脂)固化前的结构、分子质量及其分布、固化历程、热失重特性进行了表征和对比,以便为烧蚀复合材料基体的筛选提供理论依据。研究结果发现,S-157PR的分子质量最小,分布最窄,浸润性最好;4种酚醛树脂的固化峰温依次为HCYPR>BPR>WPR>S-157PR;800℃残炭率依次为BPR>HCYPR>WPR>S-157PR。 相似文献
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Polymeric 4-4 diphenyl methane diisocyanate (pMDI) was blocked with an aqueous sodium bisulfite solution to obtain water-dispersible blocked pMDI (B-pMDI) resin with different HSO3/–NCO mole ratios for the modification of urea-formaldehyde (UF) resin. Fourier transform infrared (FTIR) spectra of the B-pMDI resin clearly showed that all isocyanate groups of the pMDI resin were successfully blocked by sodium bisulfite. As the HSO3/–NCO mole ratio increased, the de-blocking temperature of the B-pMDI resin also increased. Two addition levels (1% and 3%) of the B-pMDI resin with different HSO3/–NCO mole ratios were mixed with UF resins and used as an adhesive for plywood. The gel time of the UF/B-pMDI resins decreased to a minimum at a mole ratio of 0.9 and then increased with the HSO3/–NCO mole ratio, and was consistent with the peak temperature (Tp). However, as the HSO3/–NCO mole ratio increased, the viscosity of the modified UF resins by 1% B-pMDI resin addition slightly increased, whereas those of modified resins with 3% B-pMDI resin addition rapidly increased. The adhesion strengths of plywood bonded with the hybrid resins were greater for 1% B-pMDI resin addition than for 3% B-pMDI resin addition. Formaldehyde emission of plywood bonded with the UF/B-pMDI resins significantly decreased up to 34% by the addition of B-pMDI resin at a mole ratio of 1.8. These results suggest that the modification of UF resins by mixing with water-dispersible B-pMDI resin can be a method for improving the water resistance and formaldehyde emission of UF resins for wood-based composites. 相似文献
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特种聚氯乙烯树脂生产概况 总被引:1,自引:0,他引:1
简述了国内外主要特种聚氯乙烯树脂(包括高聚合度PVC树脂、消光PVC树脂、PVC掺混树脂、氯乙烯一醋酸乙烯共聚树脂和氯化PVC树脂)的生产情况。并列举了主要特种PVC树脂的生产厂商、牌号和技术规格。 相似文献
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增黏树脂与弹性体SBS的相容性以及与热熔压敏胶性能的关系 总被引:7,自引:5,他引:2
热熔压敏胶(HMPSA)是一类不含溶剂的胶粘剂,在工业应用中占据很大的比重。工业上常用的增黏树脂有松香树脂、萜烯树脂和石油树脂三种。增黏树脂与热塑性弹性体SBS(苯乙烯/丁二烯/苯乙烯嵌段共聚物)的相容性存在一定的差异性,从工业角度重点研究和比较了增黏树脂的结构差异与性能之间的关系,并对其一般规律进行了探索。研究结果表明,当增黏树脂的软化点为100~110℃时,相应的HMPSA可获得较低的熔融黏度和较高的剥离强度,其初粘力为1~2cm;当增黏树脂的软化点为100℃时,剥离强度依次为含萜烯树脂HMPSA>含松香树脂HMPSA>含石油树脂HMPSA;当W(增黏树脂)= 210%时(相对于弹性体SBS而言),含石油树脂HMPSA的综合性能劣于含松香树脂(或含萜烯树脂)的HMPSA;当W(增黏树脂)≥210%时,HMPSA的熔融黏度低于10000mPa·s,但持粘力增强(即意味着内聚力增强)。 相似文献