氯磺化聚乙烯的合成与应用

介绍了聚乙烯、氯化聚乙烯及氯磺化聚乙烯的生产技术、加工应用进展及发展前景。     

氯磺化聚乙烯橡胶生产与应用

氯磺化聚乙烯(筒称CSM)是低密度聚乙烯或高密度聚乙烯经过氯化和氯磺化反应制得的一种特种橡胶。分子量一般在20000-30000之间，CSM具有独特的综合性能，具有良好的着色性、耐油、耐热、抗氧化性、耐候性、耐腐蚀性、阻燃性、耐磨性和韧性。因而用途广泛。     

阻燃性氯磺化聚乙烯

本文了阻燃性材料氯磺化聚乙烯加工的物理化学基础。     

氯化聚乙烯与氯磺化聚乙烯的结构与性能及共混硫化体系

主要研究了氯化聚乙烯(CM)与氯磺化聚乙烯(CSM)的结构与性能及共混硫化体系。结果表明:随着氯含量的增加,CM的玻璃化温度逐渐升高。同样氯含量的CM的玻璃化温度高于CSM,且残余结晶度高于CSM。在CSM中并用适量的CM,可以提高CSM的加工安全性,并提高硫化效率;共混胶的拉伸强度和100%定伸应力随着CM用量增加逐渐增加,拉断伸长率和撕裂强度逐渐减小;随着CM用量的增加,共混胶的耐老化及耐油性能下降;噻二唑硫化体系硫化的共混胶硫化时间短,并且硫化胶的综合性能较好。     

氯磺化聚乙烯技术进展

综述了氯磺化聚乙烯橡胶生产技术、配合、加工应用技术进展。     

氯磺化聚乙烯橡胶防腐涂料

介绍了氯磺化聚乙烯橡胶防腐涂料的基本性能、配方设计、制备方法、施工方法及其应用。     

The preparation and thermodynamic behaviors of chlorosulfonated polyethylene

The chlorosulfonated polyethylene (CSM)s with different content of chlorine and sulfur elements were prepared by aqueous solution suspension method. Prepared CSMs were characterized by Fourier transform infrared (FTIR) spectra. The content of chlorine and sulfur elements of CSM was confirmed by ion chromatography. The thermal properties and crystallization behaviors of the prepared CSMs were investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), respectively. In each TGA curve, one can observed two distinct weight loss steps, and the degradation temperatures decreased with the content of chlorine and sulfur elements increasing. The degradation temperatures of all the prepared CSMs exceeded 170°C in air, which showed good thermal stability. The calculated Avrami exponent by the opoxobck nonisothermal crystallization kinetics equation was nearly 4, which proved the CSM was homogeneous nucleation with a three‐directional spherulitic growth. The WAXD results indicated that the crystallinity of CSM decreased with the increment of chlorine and sulfur content. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

氯磺化聚乙烯制备、加工及技术进展

概述了氯磺化聚乙烯橡胶生产、加工及应用技术进展。     

Preparation of chlorosulfonated polyethylene by the gas‐solid method

Chlorosulfonated polyethylene (CSM) has been prepared by the gas‐solid method in a tank reactor using chlorinated polyethylene (CPE) and a gaseous mixture of chlorine and dioxide sulfur. Sulfur content of CSM determined by element analysis is used as a reference for the quantitative determination of the degree of chlorosulfonation. The effects of reaction temperature, effective gaseous mixture concentration, particle size of CPE, and the ratio of chlorine to dioxide sulfur on chlorosulfonation are investigated. The results indicate that with the increment of reaction temperature within the range of from 30 to 50°C, the rate of chlorosulfonation during the later reaction period (15–25 min) is markedly increased and the prepared CSM has higher sulfur content. It was also found that the rate of chlorosulfonation increases with the effective gaseous mixture concentration, and that the ratio of chlorine to dioxide sulfur is preferably 1 : 1. It was proven that HCl, by‐product of the chlorosulfonation, can accelerate the rate of chlorosulfonation when the volume concentration of HCl is lower than 40%, and that the presence of oxide results in higher sulfur content of the resultant CSM. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 3582–3588, 2001     

氯磺化聚乙烯的结构与性能研究进展

简述了氯磺化聚乙烯(CSM)在国内外的主要生产工艺方法,较详细地介绍了基体树脂类型、氯含量、硫含量等结构因素对CSM化学性能如热性能、力学性能以及耐燃性能的影响。同时还介绍了CSM中氯原子序列分布的3种定量分析方法,并对其相应特点进行了阐述。     

氯磺化聚乙烯的耐水性和耐老化性配方

通过对氯磺化聚乙烯（ＣＳＭ）彩色配方中各组分的优化选择,提高了ＣＳＭ硫化胶的耐水性和耐老化性。其配方（质量份）为：ＣＳＭ４０生胶１００,环氧树脂硫化剂１４～１６,防老剂ＮＢＣ与三嗪紫外线吸收剂２．０～２．５,促进剂ＤＭ与促进剂ＤＰＴＴ２．５～３．０,填充剂钛白粉与着色剂４０～４５,氢化松香及其他２．５～５．０。     

混合溶剂法生产氯磺化聚乙烯实验初探

将高密度聚乙烯（HDPE）树脂溶于混合溶剂中,以偶氮二异丁腈为引发剂,在装有搅拌的搪玻璃反应釜中用氯气进行氯化,用氯气和二氧化硫的混合气体进行氯磺酰化反应后制得氯磺化聚乙烯（CSM）溶液,经后部凝聚、挤压脱水后生产氯磺化聚乙烯。通过实验过程中的数据积累,掌握实验过程中的一些特殊现象,并且对异常现象加以分析和解决,为下一步装置改造创造条件。     

气相色谱法监测氯磺化聚乙烯生产过程中四氯化碳含量

提出了将生产氯磺化聚乙烯中各控制点的不同状态的样品(液体、固体)处理成易于气相色谱分析的样品的方法。为了提高分析准确度。采用不同的定量方法监测其中的四氯化碳含量。该方法在实际应用中取得了满意的结果。     

Molecular transport characteristics of a chlorosulfonated polyethylene geomembrane in the presence of aromatic esters

Results of a study on sorption and diffusion of chlorosulfonated polyethylene geomembrane with methyl benzoate, ethyl benzoate, methyl salicylate, iso-butyl salicylate, phenyl acetate, and diethyl phthalate in the temperature range 25–60°C are presented. A gravimetric sorption method is used to calculate the diffusion and permeation coefficients from the Fickian relationship. The diffusion results are dependent on penetrant–membrane interactions, temperature, and on penetrant concentration. The values of diffusion coefficients range from 0·02 × 10^?7 cm² s^?1 for diethyl phthalate at 25°C to 1·81 × 10^?7 cm² s^?1 for ethyl benzoate at 60°C. The activation energies for diffusion range from 21 to 50 kJ mol^?1. The values of heat of sorption ranged between 2·2 and 6·4 kJ mol^?1. Sorption results are also analyzed using a first-order sorption kinetic equation. Experimental results and calculated parameters are used to discuss the transport behavior. None of the esters used have shown any chemical attack toward the geomembrane.     

Mechanical properties and blend compatibility of natural rubber –chlorosulfonated polyethylene blends

Natural rubber (NR) was blended with chlorosulfonated polyethylene (CSM) with various formulation and blend ratios (NR/CSM: 80/20 –20/80, wt/wt). Rubber blends were prepared by using a two‐roll mill and vulcanized in a compression mold to obtain the 2 mm‐thick sheets. Tensile properties, tear resistance, thermal aging resistance, ozone resistance, and oil resistance were determined according to ASTM. Compatible NR/CSM blends are derived from certain blends containing 20–30% CSM without adding any compatibilizing agent. Tensile and tear strength of NR‐rich blends for certain formulations show positive deviation from the rule of mixture. Thermal aging resistance depends on formulation and blend ratio, while ozone and oil resistance of the blends increase with CSM content. Homogenizing agents used were Stuktol®60NS and Epoxyprene®25. Stuktol®60NS tends to decrease the mechanical properties of the blends and shows no significant effect on blend morphology. Addition of 5–10 phr of epoxidized natural rubber (ENR, Epoxyprene® 25) increases tensile strength, thermal aging resistance, and ozone resistance of the blends. It is found that ENR acts as a compatibilizer of the NR/CSM blends by decreasing both CSM particle size diameter and α transition temperature of CSM. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 127–140, 2006