羟丙基甲基纤维素60RT─50国产化应用

羟丙基甲基纤维素６０ＲＴ─５０国产化应用河南新乡树脂厂任光星，张合昌羟丙基甲基纤维素作为聚氯乙烯树脂分散剂，过去一直依赖进口，一是耗费了大量的外汇，二是价格一直上扬，生产没有保证。为了填补国内空白，满足于聚氯乙烯行业生产的需要，中港合作肥城瑞泰精细化...     

国产羟丙基甲基纤维素（HPMC）60RT50在30升聚合釜上的应用试验

国产羟丙基甲基纤维素（ＨＰＭＣ）６０ＲＴ５０在３０升聚合釜上的应用试验天津化工厂李秉人１试验目的羟丙基甲基纤维素（ＨＰＭＣ）是悬浮法聚氯乙烯生产中常用的主要分散剂。目前，国内主要ＰＶＣ生产厂家均使用进口ＨＰＭＣ。中港合作肥城瑞泰精细化工有限公司根据国...     

羟丙基甲基纤维素(HPMC)在PVC工业中的应用

介绍了羟丙基甲基纤维素(HPMC)的生产技术及其在PVC工业生产中的应用情况。用国产HMPC替代进口HPMC生产SPVC产品,可以大幅度降低生产成本,并且原料供应有保证。     

川维产PVA-20替代进口KH-20的成功应用

1生产试用 山东济宁中银电化有限公司(简称济宁中银公司)聚氯乙烯(PVC)生产一直采用羟丙基甲基纤维素(HPMC国产)和聚乙烯醇(进口KH-20)二元复合体系。由于聚乙烯醇一直靠日本进口，不但价格高，增加了产品成本，在一定程度上也制约了生产，尤其是影响了济宁中银公司PVC成品优等品率，增塑剂吸收量和白度两项指标一直未达标。同时为降低成本，     

HPMC—60RT50在13.5m^3聚合釜VCM悬浮聚合生产中的应用

采用国产羟丙基甲基纤维素（ＨＰＭＣ）６０ＲＴ５０做为主分散剂比采用５０９生产的聚氯乙烯树脂表观密度和吸油率都有提高。在显微镜下观察树脂颗粒形态非常规整，晶点和条状物明显减少，且树脂中ＶＣＭ残留量完全达到国标要求，故用６０ＲＴ５０完全可取代进口同类产品。     

水媒法生产羟丙基甲基纤维素工艺探析

简述羟丙基甲基纤维素生产工艺及国内外生产工艺概况；肯定我国水媒法工艺优点，提出利用现代电子技术改进水媒法工艺，提高国产羟丙基甲基纤维素质量。     

国产瑞泰丙基甲基纤维素质量分析

本文剖测了以国产瑞泰羟丙基甲基纤维素[HPMC(65RT50)]所制备的SG—7型PVC树脂质量,并与进口(日)信越HPMC(65SH50)等PVC树脂进行了特性对比和评价。     

以纤维素悬浮体系为基础的PVC颗粒结构

我们研究了羟丙基甲基纤维素(HPMC)悬浮体系中,各因素变化对聚氯乙烯(PVC)颗粒形态的影响。研究结果表明,保     

国产瑞泰羟丙基甲基纤维素质量分析

本文剖测了以国产瑞泰羟丙基甲基纤维素所制备的ＳＧ－７型ＰＶＣ树脂质量，并与进口（日）信越ＨＰＭＣ９６５ＳＨ５０）等ＰＶＣ树脂进行了特性对比和评价。     

外国专利文摘

日本积水化学公司以氯乙烯100、水120、聚乙烯酸0.04、羟丙基甲基纤维素0.01、月桂酸0.5和EHP引发剂0.08份进行悬浮聚合制得的聚氯乙烯进行氯化制造出含氯量66.5%氯化聚氯乙烯.此种产品具有较高的热稳定性和抗冲击强度.     

乙烯酮(双乙烯酮)下游产品废水的治理技术

乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。     

A study of miscibility of blends of polybutadienes of varying microstructure

The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure.     

几种乙炔加压设备性能的比较

阐述并比较了几种加压设备在乙炔加压清净过程中的性能和特点。     

粉煤灰中烧失量检测的不确定度分析

以F类粉煤灰为例,详细介绍了测定粉煤灰中烧失量的步骤、计算数学模型、影响测量不确定度的因素以及各项测量不确定度分量评定,人员、设备、材料、方法、环境都是影响测量不确定的因素。     

生物油的成分分析及物性测定

以添加FeCl2的ZnCl2-KCl混合熔盐裂解纤维素和秸秆,制得生物油。采用傅立叶变换红外光谱法和气相色谱-质谱法分析生物油的成分。结果表明,生物油中成分复杂,含有氧元素、多种有机化合物,主要包括酮类、醛类、酚类及羧酸类等。测定了20～80℃生物油的密度和粘度,发现生物油的密度与温度呈较好线性关系,而生物油的粘度均大于水的粘度,且不同熔盐体系对秸秆生物油的粘度无较大影响。     

分解炉扩径的技术改造

我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉     

Process of acceleration of filtration of viscose

Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969.     

Effect of degree of deacetylation of chitosan on the kinetics of ultrasonic degradation of chitosan

The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003