莱茵化学在华力推胶粘剂新组分

莱茵化学工程塑料部新一代Hycasyl水解稳定剂系列产品在第13届中国国际胶粘剂及密封剂展上亮相。该系列产品专为全球胶粘剂市场开发,根据不同的终端使     

行业动态

<正>单体型碳化二亚胺类水解稳定剂通过鉴定2014年2月25日,山西省科技厅组织有关专家对山西省化工研究所完成的"单体型碳化二亚胺类水解稳定剂Bio-SW 100的研究"项目进行了科技成果鉴定。与会专家的一致认定,该项目工艺合理,产品对PLA、PET等聚酯基聚合物的水解稳定性具有明显改善,对促进我国生物基和生物可降解塑料的应用具有重要意义,应用前景广阔,在同类研究中达到了国际先进水平。     

水解稳定剂BIOSW-100研发成功

日前,山西省化工研究所年产100 t水解稳定剂BIO SW-100中试项目获得成功,标志着山化所在生物基和生物可降解塑料配套助剂工程化技术开发方面再获佳绩。BIO SW-100属于单体型碳化二亚胺类水解稳定剂,其主要应用于PLA、PHA、PBS、PPC等全生物降解塑料耐久性制品,EVA、PET、PBT、PA、PC等缩聚类工程塑料制品和聚酯型聚氨酯材料等易水解聚合物改性,旨在提高制品的耐水解稳定性,确保在应用环境中力学性能稳定可靠。同时,     

“单体型碳化二亚胺类水解稳定剂Bio-SW 100的研究”通过山西省科技厅组织的成果鉴定

<正>近日,山西省科技厅组织有关专家对山西省化工研究所完成的"单体型碳化二亚胺类水解稳定剂Bio-SW 100的研究"项目进行了科技成果鉴定,经过与会专家的一致认定,该项目工艺合理,产品对聚乳酸(PLA),聚对苯二甲酸乙二酯(PET)等聚酯基聚合物的水解稳定性具有明显改善,对促进我国生物基和生物可降解塑料的应用具有重要意义,应用前景广阔,在同类研究中达到了国际先进水平。本项目产品成     

“单体型碳化二亚胺类水解稳定剂Bio-SW100的研究”通过山西省科技厅组织的成果鉴定

<正>2014年2月25日,山西省科技厅组织有关专家对山西省化工研究所完成的"单体型碳化二亚胺类水解稳定剂Bio-SW100的研究"项目进行了科技成果鉴定,经过与会专家的一致认定,该项目工艺合理,产品对PLA、PET等聚酯基聚合物的水解稳定性具有明显改善,对促进我国生物基和生物可降解塑料的应用具有重要意义,在同类研究中达到了国际先进水平。本项目产品成本与国外对比较为低廉,环境影响也相对较     

碳化二亚胺的制备及其水解稳定作用

简要介绍了可用于水解稳定剂的碳化二亚胺的性质、制备和在聚氨酯、聚酯树脂中的应用。     

聚氨酯的化学降解及其性能

简单介绍了聚氨酯的水解、热降解、热氧化降解和紫外线降解的反应机理。举例比较了加入或未加入稳定剂的聚氨酯弹性体在降解试验前后的拉伸强度及其它性能变化,指出了添加稳定剂可改善聚氨酯弹性体的抗降解稳定性。     

抗老化剂对聚己内酯/木纤维复合材料热老化性能的影响

分别采用力学性能分析、红外光谱分析、扫描电子显微镜分析、X射线衍射分析等表征手段研究了抗氧化剂、抗水解剂、热稳定剂等抗老化剂含量对杨木纤维（WF）增强聚己内酯（PCL）复合材料热老化性能的影响。结果表明,抗氧化剂丁基羟基茴香醚（BHA）、抗水解剂（丁二醇双缩水甘油醚）及热稳定剂（Ca/Zn热稳定剂）的适量添加,都有助于延缓PCL/WF复合材料的热老化;分别选取抗老化效果最佳配比：抗氧化剂4 %、抗水解剂4.5 %、热稳定剂2 %添加入PCL/WF复合材料中,协同作用下其抗老化效果相对未添加或只添加其中一种抗老化剂时都有所提高。     

一种抗蠕变抗水解聚酯POY纤维及其制备方法

本发明涉及一种抗蠕变抗水解聚酯POY纤维及其制备方法,包括抗蠕变抗水解聚酯熔体的制备、和抗蠕变抗水解聚酯POY纤维的制备;将聚酯与含氟环氧化合物和碳化二亚胺类稳定剂共混或者在聚酯的合成过程中加入含氟环氧化合物和碳化二亚胺类稳定剂即得到抗蠕变抗水解聚酯熔体。     

塑料光稳定剂的生产与研究进展

概括了国内外塑料光稳定剂的生产现状,综述了国内外塑料光稳定剂的研究进展,重点介绍了受阻胺类光稳定剂和紫外线吸收剂,指出了塑料光稳定剂的发展趋势,对国内塑料光稳定剂产业提出了一些发展建议。     

废弃玻璃钢的资源化研究进展

介绍了废弃玻璃钢的种类和来源,综述了国内外各种废弃玻璃钢的资源化研究进展,其中包括热解、水解、醇解、常压解聚,粉碎回收、能量回收、以及作为水泥原料、高炉炼铁还原剂使用等,探讨了我国在废弃玻璃钢资源化研究中存在的问题及对策,提出了今后我国废弃玻璃钢资源化研究的方向。     

Effects of Grafting Maleic Anhydride onto Poly-ɛ-caprolactone on Facilitative Enzymatic Hydrolysis

Plastic waste is a global issue because it causes overflowing landfills and pollution, leading to environmental concerns. To address this crisis, materials that can be decomposed in the natural environment are introduced to replace conventional plastics. Poly-ɛ-caprolactone (PCL) is a commonly used plastic that can degrade in natural environments. However, owing to its hydrophobicity, its natural decomposition rate is low. In this study, PCL is modified with maleic anhydride (MA) (PCL-g-MA) to increase hydrophilicity and amorphous region for faster decomposition. To assess the hydrolysis in seawater, lipase hydrolysis is performed to compare the decomposition of PCL-g-MA and PCL. Consequently, in a Pseudomonas lipase-containing PBS solution, it takes 72 and 120 h for complete hydrolyze of PCL-g-MA and PCL, respectively. MA grafted onto PCL increases the amorphous region, where lipase can easily diffuse into PCL-g-MA. Morphological (FESEM and POM images), thermal (TGA and DSC), and structural (FTIR, XRD, and XPS) analyzes support the hydrolysis reaction. The mechanisms proposed in this study confirm that lipase hydrolysis starts in the amorphous regions and then transfers to the crystal regions. This hydrolysis progress is expected to facilitate the creation of eco-friendly low-cost PCL-g-MA composites with high-rate hydrolysis, such as bio-plastics and bio-fibers.     

二甲基二氯硅烷浓酸与恒沸酸水解方法比较

聚二甲基硅氧烷主要由二甲基二氯硅烷水解制得,介绍了二甲基二氯硅烷水解的两种方法,即浓酸水解法与恒沸酸水解法,以60 kt/a二甲基二氯硅烷水解为例,对两种水解工艺过程的用能、设备投资、占地投资等进行了计算分析。结果表明,浓酸水解方法具有成本低、能耗低、流程短等优点,将逐渐取代恒沸酸水解方法成为聚硅氧烷生产的新的发展趋势。     

Acidic and basic hydrolysis of poly(N‐vinylformamide)

Poly(N‐vinylformamide) (PNVF) was synthesized and hydrolyzed to poly(vinylamine) (PVAm) in both HCl and NaOH solutions. The hydrolysis kinetics and the equilibrium hydrolysis were examined experimentally at different temperatures, polymer concentrations, and acid‐ or base‐to‐amide molar ratios. The hydrolysis kinetics strongly depended on temperature, polymer, and HCl or NaOH concentrations, but showed little dependence on PNVF molecular weight. The acid hydrolysis of PNVF exhibited limited conversions because of the electrostatic repulsion among the cationic amine groups generated during hydrolysis and proton hydrates. In the basic hydrolysis, complete amide conversions were observed when the NaOH/amide molar ratios were greater than unity. The effects of temperature and PNVF concentration on the equilibrium amide conversion appeared to be negligible in both acidic and basic hydrolysis. The equilibrium conversions of base hydrolysis were higher than those of acidic hydrolysis under the same reaction conditions. At NaOH/amide ratios of less than unity, the equilibrium hydrolysis experiments revealed that one base molecule could induce the hydrolysis of more than one amide group. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 3412–3419, 2002     

玉米秸秆半纤维素制备木糖醇的研究

首先采用无污染的碱性过氧化氢法研究了半纤维素的分离与提取,然后对提取的半纤维素分别进行化学水解和酶水解比较,最后研究了水解液发酵制备木糖醇。结果表明,半纤维素分离提取的优化参数为:2%过氧化氢,2%氢氧化钠,加热时间4 h,反应温度75℃。使用CF3COOH水解半纤维素所得木糖含量为67%~73%,水解率为76%~84%,稀盐酸预处理半纤维素再化学水解所得木糖含量高达88%,水解率上升至大约90%。半纤维素的酶水解实验表明,木聚糖酶的水解专一性高于半纤维素酶,木聚糖酶水解率为38%~60%。在水解液发酵实验中,酶水解液的木糖醇转化率高于化学水解液。另外,通过浓缩半纤维素水解液,提高发酵液的木糖初始浓度,有利于菌株生长,可以提高木糖醇转化率。研究对于玉米秸秆半纤维素制备化学品具有一定的指导意义。     

Aging effect in the adhesion of a PC/CPVC arrangement for application in thermo-solar collectors

This work studies the aging of materials in a polycarbonate/chlorinated polyvinyl chloride (PC/CPVC) arrangement, used in a flat plate thermo-solar collector. Typically, PC is used as an absorbing surface and CPVC in entrance and exit heads of the flow, which in this case is water. In this study, two types of methacrylate adhesives were used to bond both plastics, denominated MP and SK. The experiment comprised a study of adhesion behavior between these polymers and the adhesives, in contact with distilled water at different temperatures and different time intervals, simulating the corresponding operating conditions of a thermo-solar collector. Results showed that the SK adhesive did not fail under these conditions, while the MP adhesive underwent evident aging and adhesive failure. In addition, the PC presented a reduction in its mechanical strength when it was subjected to higher temperatures and periods of hygrothermal exposure, probably due to physicochemical deterioration caused by hydrolysis.     

尿素水解方法的简述及展望

综述了现今国内外尿素水解技术的研究现状,对各种水解技术的优点和存在的不足进行了梳理与总结。并展望其发展前景,提出了需进一步研究及解决的问题。     

乙酸甲酯的水解分离过程及工艺研究进展

对乙酸甲酯水解体系的催化剂和热力学，动力学研究现状进行了评述，分析了传统的水解分离工艺，并提出了可行的新工艺。结合当前最新研究动态，指出了研究中应注意的关键问题是今后的发展方向。     

利用水解酶提取文冠果油脂

采用3种酶对文冠果种仁进行水酶法提油,其中Alcalase 2.4 L蛋白酶的效果最好. 在Alcalase 2.4 L蛋白酶用量为0.02 mL/g的条件下,通过单因素实验和Box-Behnken中心组合实验,应用SAS软件分析得出水酶法提取文冠果油脂的最佳工艺条件为：温度55℃, pH 9, 固液比1 g:6 mL, 水解时间4 h,在此条件下油脂提取率和蛋白水解度分别达到78.67%和9.15%.     

Imidazoline hydrolysis in alkaline and acidic media—A review

The literature was reviewed for information on imidazoline hydrolysis. Conflicts involving structures and mechanisms of hydrolysis have been found. Researchers also disagree as to the role of water and whether a protonated form of the imidazoline exists. However, there is agreement that the rate of hydrolysis is dependent on pH and temperature.