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马来酸单酯稀土用作PVC热稳定剂的研究 总被引:6,自引:1,他引:5
介绍一种马来酸单酯稀土(RETM)用作PVC热稳定剂的特性.RETM的热稳定性和透明性高于硬脂酸稀土(RESt),而压析和喷霜与RESt一样均小;与由RESt组成的无毒复合热稳定剂相比,由RETM组成的新型无毒复合热稳定剂的性能-价格特性更优,应用范围更宽,不但适用于软质,而且可用于半硬质PVC制品的加工. 相似文献
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PVC用稀土热稳定剂的进展 总被引:3,自引:0,他引:3
介绍了稀土稳定剂的国内外发展状况、特点、稳定机理、应用以及市场前景等。从环境保护和人类健康角度出发,阐述了大力发展稀土稳定剂的必要性。由于我国是稀土储量和产量大国,开发并利用这一资源极具潜力;我国又是PVC应用大国,现阶段稳定剂产量远不能满足需求。因此,研制开发PVC用稀土复合热稳定剂具有较大的市场前景。 相似文献
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PVC稀土稳定剂的进展 总被引:11,自引:0,他引:11
对PVC稀土稳定剂的开发,应用,特点以及发展前景做了详细的综述,确定稀土化合物是一种可以替代传统热稳定剂的新型热稳定剂,该稳定剂无毒,价廉,稳定效果好,制品性能优异,具有广阔的发展前景。 相似文献
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热稳定剂是聚氯乙烯(PVC)加工中的重要助剂,稀土热稳定剂具有热稳定性好、无毒、无污染等许多优点,开发利用前景广阔。本文介绍了聚氯乙烯稀土热稳定剂的合成研究及应用进展,指出了其今后的发展前景及趋势。 相似文献
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环氧脂肪酸稀土的合成及其对PVC热稳定作用的研究 总被引:23,自引:1,他引:22
制备了环氧基保留完好的高纯度环氧脂肪酸稀土。研究发现环氧脂肪酸稀土对PVC的热稳定作用类似于硬脂酸稀土,具有长期型热稳定剂的特征,但其热稳定效能明显优于后者,可代替硫醇辛基锡达50%而不降低热稳定性,而硬脂酸稀土只能代替约25%。 相似文献
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简要论述了聚氯乙烯(PVC)热降解机理及稀土热稳定剂的作用机理,着重介绍了国内外稀土类热稳定剂的研究进展,包括无机稀土热稳定剂和有机单一稀土热稳定剂及有机复合稀土热稳定剂,并对稀土热稳定剂的发展前景进行了展望。 相似文献
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环氧脂肪酸钙的直接法合成及其对PVC的热稳定作用 总被引:4,自引:0,他引:4
以一种简便的方法制备了环氧基保留完好的高纯度环氧脂肪酸钙,研究发现环氧脂肪酸钙对聚氯乙烯(PVC)的热稳定作用类似于硬脂酸钙,具有长期热稳定性的特征;但其热稳定效能明显优于后者,且具有较好的初期着色性. 相似文献
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通过正交设计与中心组合规则实验优化了SG-7型PVC树脂中添加苹果酸镧、硬脂肪酸铈、柠檬酸钕为稀土复合热稳定剂的配方,得到了各因素之间的相互作用的响应面图,探讨了物质之间相互作用机理,检测了产品的性能。结果表明:当苹果酸镧、硬脂肪酸铈、柠檬酸钕和树脂质量分数分别为3.3%、3.71%、3.47%和89.52%时,所得产品的热分解温度达到185.8℃,并能持续40min以上;稀土离子Nd^3+、Ce^4+、L^3+离子半径的增大,对产品的热稳定作用越明显;稀土离子与聚氯乙烯大分子成键能力和吸附能力的强弱与聚氯乙烯树脂加工的热稳定性成正相关性;稀土阴离子配体对聚氯乙烯树脂力学性能的改善也有一定的促进作用。 相似文献
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以邻苯二甲酸酐、异辛醇、氢氧化钠、氯化稀土、混合溶剂、助剂为原料 ,通过酯化反应、皂化反应、复分解反应以及复配制备了以邻苯二甲酸单异辛酯稀土为主要成分的液态稀土复合热稳定剂 ,其工艺条件为 :酯化反应的温度控制在 130~ 14 0℃ ,反应时间为 1h ;皂化反应的温度为 6 0℃ ,反应时间为 5min ;复分解反应的温度在 6 0~ 70℃ ,反应时间为 1h ;水洗温度控制在 6 0~ 6 5℃ ;混合溶剂的用量为 5 0 % ,稀土含量为 6 0 3% ;在复配过程中 ,采用亚磷酸酯作为辅助热稳定剂 ,其用量为 5 %~ 7% ,PVC中加入 2 %的这种稀土复合热稳定剂 ,在185℃下 ,其热稳定时间为 4 5min。 相似文献
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水滑石类热稳定剂在PVC中应用研究进展 总被引:1,自引:0,他引:1
水滑石类热稳定剂是一类新型热稳定剂,具有无毒、廉价和高效的优点。介绍了水滑石的结构特征、对PVC的热稳定作用机理以及在PVC的应用研究进展。总结出提高热稳定剂在PVC中的分散性、与其它类型热稳定剂的复配以及规模生产工艺稳定化是未来水滑石类热稳定剂的研究方向。 相似文献
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Lucas J. Stolp Eugene Joseph Dharma R. Kodali 《Journal of the American Oil Chemists' Society》2019,96(11):1291-1302
Plasticizers are nonvolatile organic liquids that impart flexibility to polymers. Due to environmental, health, and safety reasons, the industry is looking for bioplasticizers to replace petroleum-derived phthalates. To fulfill this need, soy fatty acid ester estolides were synthesized, characterized, and evaluated as phthalate replacements. Soybean oil was transesterified with methanol or glycerol to form lower molecular weight fatty acid esters that were epoxidized and ring opened with acetic acid and acetylated to give the final products. Ring opening and acetylation of the epoxidized oleic acid esters gave acyclic acetate fatty acid ester estolides, whereas the polyunsaturated fatty acid esters, linoleate, and linolenate gave cyclic tetrahydrofuran derivatives and cross-linked higher molecular weight materials. The cyclization mechanism to form the tetrahydrofuran derivatives was postulated. Soy fatty acid ester estolides were compounded with formulated poly(vinyl chloride), (PVC) and tested for their functional properties. The physical and functional properties of the new bioplasticizers were compared with commercial plasticizers. The elasticity of PVC compounded with experimental plasticizers and commercial phthalates was comparable. PVC compounded with fatty acid methyl ester estolide showed lower glass transition temperature and similar tensile properties compared to PVC compounded with the commercial phthalate. PVC compounded with the glyceryl fatty acid ester estolide showed a higher glass transition temperature, higher tensile properties compared to PVC compounded with the commercial phthalate. 相似文献
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以一种简便的方法制备了环氧基保留完好的高纯度环氧脂肪酸钙.研究发现环氧脂肪酸钙对聚氯乙烯(PVC)的热稳定作用类似于硬脂酸钙,具有长期热稳定性的特征,但其热稳定效能明显优于后者,且具有较好的初期着色性. 相似文献
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Mono- and di-glycidyl esters of phthalic acid were tested as plasticizers and stabilizers for PVC. These were compared with commercial products, such as dibutylphthalate, di-2-ethylhexyl-phthalate, epoxydized soyabean oil and glycerine monooleate. The glycidyl esters of mono-alkylphthalates exhibited, at lower temperature levels, a better solubility for PVC than di-2-ethylhexyl-phthalate. n-Octyl- and 2-ethyihexyl-glycidyl-phthalate are better than di-2-ethylhexyl-phthalate w.r.t. plastcizing and gelatinizing characteristics. Mixture of PVC with either of the two glycidyl esters exhibited also higher thermal stability than diethylhexyl-phthalate-PVC-mixture. n-Octyl- and 2-ethylhexyl-glycidyl-phthalate are comparable with glycerinmonooleate as PVC-co-stabilizer. However, they are as stabilizers inferior to epoxydized soyabean oil. The glycidyl esters exhibit a higher volatility compared to diisooctyl-phthalate, whereas, this is in the case of dibutylphthalate lower. Diglycidylphthalate is in contrast to alkylglycidylphthalates unstable above 130°C so that it is not suitable as PVC-plastizicer. 相似文献