国产常州PU浆料主要缺陷及其配方改进

前年,常州合成化工总厂引进意大利设备生产的聚氨酯浆料进入PU原料市场,由于其价格较进口浆料低,且性能较稳定,因此国内一些厂家已开始使用,但在生产过程发现该厂的PU浆料易产生针孔及龟裂或不能满足产品性能的要求,于是我们大胆地在     

4月聚氨酯树脂下游市场概述

一、本月浆料国内市场行情分析 4月国内PU浆料行业呈现走淡趋势，华东、温州地区大型工厂开沟7-8成左右，小工厂开工5成上下。华南地区相对较好，开工7—8成，部分工厂生产稳定。开工率对市场支撑力度下滑，且银行准备金上调，进一步增加了中小工厂的资金压力，而PU浆料下游的疲软也使得浆料价格迟迟难以上调.     

全塑型聚氨酯塑胶跑道密度的影响因素研究

合成了一系列环保型双组分聚氨酯浆料并制备了全塑型聚氨酯(PU)塑胶样块，系统地研究了浆料A料中重钙用量、发泡催化剂用量、凝胶催化剂用量、水用量及环境温度等对全塑型聚氨酯塑胶跑道密度的影响。结果表明，制备的PU塑胶样块密度随着重钙、凝胶催化剂用量的增加而升高，随着水分以及发泡催化剂用量的增加而降低，随着环境温度的升高而降低。     

聚氨酯涂层工艺的研究

本文主要介绍聚氨脂（PU）涂层生产工艺的研究，有效解决涂层浆料在生产过程中的“挂皮”现象；改善浆料的流动性，解决高厚度涂刮及刀距的选择等问题以满足客户的需求。     

澄星化工DMF产能跻身国内前三甲

被称为“万能溶剂”的DMF，在国内需求主要集中在PU浆料、腈纶、制药及其他行业，近几年来，由于PU浆料、医药和染料行业均出现稳步增长的良好态势，腈纶行业需求基本保持稳定，从而导致我国DMF的需求增长率自2001年以来基本保持在20％以上的增速。当前国际DMF产业有向我国转移的趋势，因此，我国DMF在未来的出口量有望得到增长，国内厂商也将获得持续成长期。     

聚氨酯树脂

下月部分PBT厂家检修，PU浆料厂家未有利好消息传出，氨纶市场厂家减停产比例逐步上调，看低氨纶价位走势心态出现，     

纳米铋掺杂二氧化锡/水性聚氨酯复合材料

以自制纳米铋掺杂二氧化锡(nano-BTO)分散浆料和水性聚氨酯(PU)为原料,采用共混法制备nano-BTO/水性聚氨酯杂合材料。运用zeta电位仪、激光粒度仪和TEM等研究了nano-BTO的zeta电位分布及其分散。结果表明,nano-BTO浆料的等电点在pH=6附近;采用硅烷偶联剂KH-550和高分子分散剂DP-518对nano-BTO粉体进行分散处理可获得良好分散性的水性浆料。采用紫外-可见-近红外分光光度计和自制的隔热测试装置等研究了nano-BTO/氨酯杂合材料的力学性能、光学性能和热学性能。结果表明,当nano-BTO含量为1.0%时,涂膜的拉伸强度和断裂伸长率分别达到了9.23 MPa、223%,可见光透射率约为70%,其隔热效果同比纯PU膜可降温达8℃以上。     

PU浆料行业的现状和展望

一、PU浆料行业的分布 据不完全统计,2008年国内PU浆料的年生产能力约170万吨,其分布与PU合成革的分布基本一致,集中分布在中国东部沿海一带,按其产能,浙江地区约占63％,江苏地区约占15％,广东、福建地区约占14％,其它地区约占8％,而浙江则以温州、丽水最为集中。     

DMF生产、消费和未来发展

二甲基甲酰胺(DMF)是性能优良的有机溶剂，也是重要的有机合成原料和农药、医药等的重要中间体，又是各种气体的吸附剂。它广泛应用作PU合成革及PU鞋底浆料的溶剂；腈纶干法纺丝的溶剂；在石油化工生产中用作气体吸收剂，用于分离和精制乙烯、乙炔、丁二烯、异戊二烯等产品；在有机合成中可用作农药和医药的原料；在电子工业中用作环氧树脂催化剂的溶剂；在很多领域DMF主要用作多种聚合物和树脂的溶剂和清洁剂等，是用途比较广泛的化工产品。     

2006年度 中国聚氨酯产业分析报告

环球聚氨酯网普华咨询工作室出品的年度PU产品中国市场分析报告，是中国聚氨酯界第一份具有仝面总结性、展望性的年度PU产品分析报告。内容涵盖AA、BDO、DMF、MDI、PPG、PO、TDI、浆料、鞋底原液等多个聚氨酯及其下游产品。     

Metal–organic framework (UiO‐66)‐dispersed polyurethane composite films for the decontamination of methyl paraoxon

Polyurethane (PU) composite films containing UiO‐66 were prepared for the decontamination of methyl paraoxon (MPO), an organophosphate‐type nerve agent simulant. Waterborne PU dispersions were synthesized by changing the type of polyol to improve the miscibility with UiO‐66. Depending on the size of the polyol, the PU films had different surface free energy, flexibility and compatibility with UiO‐66. UiO‐66 was well dispersed in PU films when the flexibility of the films increased. The tensile strength of the UiO‐66/PU composite films gradually increased from 7.5 to 11.3 MPa with increasing UiO‐66 content, but the elongation decreased from 781 to 120%. The decomposition of MPO by the UiO‐66/PU composite films increased with an increase of the UiO‐66 content and hydrolysis time. In the case of the 21.2 wt% UiO‐66/PU composite film, 48% of MPO was decomposed within 3 h. This was similar to the decomposition when using a UiO‐66 slurry (52%) under the same decomposition conditions. Unlike the UiO‐66 slurry, the 21.2 wt% UiO‐66/PU composite film maintained a similar MPO decomposition performance after 10 repeated experiments. © 2019 Society of Chemical Industry     

聚氨酯填充型泡沫混凝土复合材料的性能研究

将不同掺量聚氨酯（PU）加入泡沫混凝土（FC）,研究聚氨酯填充型泡沫混凝土（FC/PU）复合材料的性能。结果表明：随着PU掺量的增加,FC/PU复合材料的导热系数不断降低,阻燃性能变差。PU掺量为0～4%时,随着PU掺量的增加,FC/PU复合材料的浆体黏度逐渐降低,气孔特性变好,抗压强度不断增大。PU掺量超过4%时,FC/PU复合材料黏度开始增大,气孔特性变差,抗压强度逐渐降低。PU掺量为4%时,FC/PU复合材料的综合性能最优,与未掺入PU相比,黏度降低62.7%,气孔特性较好,抗压强度提高75.0%,导热系数降低18.7%,阻燃性能仍能达到A1级。     

Studies on an Improved Plastic Bonded Explosive (PBX) for Shaped Charges

This paper reports the characteristics and performance evaluation of a pressed plastic bonded explosive (PBX) composition based on hexanitrohexaazaisowurtzitane (HNIW, CL‐20) and polyurethane (PU) in comparison with PU‐coated cyclotetramethylene tetranitramine (HMX). PU‐coated compositions were prepared by slurry method. The processed CL‐20‐based composition exhibited a relatively higher sensitivity compared to that of the HMX composition. The measured velocity of detonation (VOD) of the CL‐20‐based composition was found to be higher than predicted. A theoretical approach was applied to assess the penetration capability of the CL‐20 formulation. Shaped charges of 32 mm caliber were prepared and penetration experiments were carried out at 37 mm standoff distance on mild steel blocks. The results established high penetration capability of CL‐20‐based formulation. An attempt was made to explain the trends obtained.     

Ceramic foams with micron/sub-micron sized porous structure for efficient high-temperature particulate matter capture

Constructing high-performance air filters for high-temperature particulate matter (PM) removal is of great importance but remains challenging. Here we demonstrate the ceramic foam-based filters via polyurethane (PU) foaming using diatomite and kaolin powder as the starting materials. Diatomite was grafted by dodecanedioic acid (DA) to improve the dispersity in the PU slurry. The calcined products demonstrated a hierarchical pore structure with multiple well-controlled micron-sized window pores on the cell wall of the sub-micron bubble. The resulting products exhibited a high removal efficiency (96.3%) at a pressure drop of 33 Pa. This research showed that as-prepared ceramic foams can be potentially used as new high-temperature filters for high-temperature PM removal.     

酰化试剂中水份含量对聚酯羟值影响表征

PU聚氨酯生产中重要物料聚酯多元醇，其羟值大小测定的准确性是确定浆料产品质量、生产工艺的前提条件，酰化法是传统的并适用于工业化生产检验羟值的化学分析法，体系中酰化试剂水份存在对聚酯羟值的大小有很大影响。酰化试剂中水份含量不大于0.30％为最佳有效的生产控制条件。     

A nitride whisker template for growth of mullite in SiC reticulated porous ceramics

Silicon carbide reticulated porous ceramics (SiC RPCs) were fabricated by polymer replica technique. The effects of nitride whisker template on the growth of mullite, the strut structure and mechanical properties of SiC RPCs were investigated. Prepolyurethane (PU) open-cell sponge was first coated by SiC slurry consisting of SiC, reactive Al₂O₃, microsilica and Si powder, then it was nitridized at 1400 °C in a flowing N₂ atmosphere to prepare SiC preforms. Subsequently, these preforms were treated by vacuum infiltration of alumina slurry and fired at 1450 °C in air. The results showed that Si₂N₂O whiskers grew on the surface and in the matrix of SiC preforms after nitridation. The diameter of struts in SiC RPCs increased after vacuum infiltration process because alumina slurry was easily adhered by the surface nitride whiskers. In addition, such whiskers inside the strut of SiC preforms acted as the template to promote the growth of column-liked mullite in SiC RPCs. The mechanical properties and thermal shock resistance of SiC RPCs were greatly improved due to the special interfacial characteristics of multi-layered struts as well as better interlocked column-liked mullite in SiC skeleton.     

聚氨酯胶粘剂的研究进展

综述了聚氨酯胶粘剂的合成、特性和种类。概述了近年来国内外聚氨酯胶粘剂的研究和应用进展,重点介绍了聚氨酯胶粘剂的发展动态和几类主要的聚氨酯胶粘剂,并对其进行了分析,结合实际情况对今后聚氨酯胶粘剂的发展方向作出了展望。     

涂覆聚氨酯的聚酯/氨纶复合织物的定量分析研究

研究了涂覆聚氨酯(PU)的聚酯/氨纶复合织物(简称PU涂层复合织物)的定量分析方法,探讨了以四氢呋喃和环己酮作为溶剂在不同温度条件下对去除PU涂层复合织物中的PU涂层的效果,对去除PU涂层后的PU涂层复合织物进行其中的聚酯纤维含量(G)的测定并分析了未涂覆PU的相应聚酯/氨纶复合织物中的聚酯纤维含量(G0).结果表明:...     

纳米凹凸棒土改性聚氨酯纤维的热性能研究

用不同含量的纳米凹凸棒土(AT)改性聚氨酯(PU)纤维,研究了改性PU纤维热分解动力学,测定了分解活化能,讨论了AT对改性PU纤维热性能的影响。结果表明:AT的加入,提高了PU纤维的起始分解温度,改善了纤维的热稳定性;加入质量分数为1.5%的AT,改性PU纤维的起始分解温度相比纯PU纤维提高了近14℃,增强了PU硬段的热分解稳定性。     

用FTIR研究聚氨酯／不饱和聚酯IPN体系的反应动力学

利用傅里叶变换红外光谱研究聚氨酯不饱和聚酯互穿聚合物网络体系的反应动力学，求出了ＰＵ的反应速度常数ｋ。实验结果表明，ＰＵ在半－ＩＰＮ体系中的反应为二级反应，ＩＰＮ体系中ＰＵ组分与ＵＰ组分的反应相互影响：ＵＰ组分使ＰＵ组分的前期反应速度变慢，后期反应速度相对增加；ＰＵ组分使ＵＰ组分聚合的诱导期明显缩短。ＰＵ和ＵＰ的配比对反应转化率的影响是反应前期ＰＵ组分含量越高，ＰＵ组分反应转化率也越高；反应后期，