水性氯丁胶乳的改性方法及其应用

对水性氯丁胶乳的制备以及进行改性的方法进行了介绍和分析,并探讨了水性氯丁胶乳在水性胶黏剂领域中的应用。     

一种装饰用强力水性免钉胶的制备及研究

制备了一种装饰用强力水性免钉胶,讨论了氯丁胶乳/苯丙乳液混拼比例、增黏乳液、粉状填料和催干剂等对水性免钉胶性能的影响。研究结果表明:当m(氯丁胶乳)∶m(苯丙乳液)=1∶1、m(水性松香酯乳液)∶m(水性萜烯酚醛乳液)=5∶20、m(碳酸钙)∶m(亲水气相二氧化硅)=12∶3、催干剂添加比例为2%,采用先润湿后分散工艺时,制备的水性免钉胶性能相对较佳。     

专利

自乳化水性环氧树脂涂料及其制备方法;一种抗氧化剂的制备方法;一种热塑性丁苯橡胶水性胶乳沥青改性剂及其制备方法;一种水性氯丁粘合剂及其制备方法;一种包覆疏水芯材温敏型微胶囊的制备方法.     

氯丁胶乳胶粘剂研究进展

分析了氯丁胶乳的特性,综述了氯丁胶乳胶粘剂的研究进展,指出了氯丁胶乳胶粘剂制备的技术关键。     

氯丁胶乳型胶粘剂专利

水基胶粘剂；氯丁胶乳的制备方法及其胶粘剂；氯丁胶乳的生产工艺及其水基胶粘剂组成；氯丁胶乳和胶粘剂组成；水基胶粘剂组成。     

海外市场

美国继干胶之后氯丁胶乳短缺美国供应商已向广大客户发出通报,表示4月31日以后,不能保证氯丁胶乳供应。美国经营氯丁胶乳的合成胶乳公司已于3月24日致函所有客户,说明他们将尽量满足大家的需求,但由于生产厂家关闭工厂、氯丁胶乳生产利润低以及其他问题,在4月31日以后他们不敢担保每一位客户都能得到想要的Lipren牌氯丁胶乳。据合成胶乳公司介绍,最近有几家氯丁胶乳厂按计划关闭已经影响到市场。在欧洲,意大利埃尼化工公司已经关闭了一家合成橡胶厂;在美国,杜邦功能弹性体公司准备关闭肯塔基州路易斯维尔合成氯丁橡胶设施,并将氯丁橡胶生产…     

新型橡胶复合材料阳离子氯丁胶乳水泥的研究

本文对橡胶复合材料阳离子型氯丁胶乳水泥的配方、基本性能及用途作了比较系统地研究介绍;对影响阳离子型氯丁胶乳水泥基本性能的各种因素进行了比较全面的试验和对比;对阳离子型氯丁胶乳水泥的配制工艺。施工方法以及应该注意的有关问题作了较详细的说明;最后对胶乳水泥的改性机理还作了简单的分析。总之,通过本文可以使人对阳离子型氯丁胶乳水泥的制造、基本特性、改性机理以及用途,会有一个比较全面的了解。     

建筑业用氯丁胶乳胶粘剂

建筑业用氯丁胶乳胶粘剂郭济中（天津橡胶研究所，３００１９３）受溶剂的限制，在一些应用领域中，溶剂型氯丁橡胶胶粘剂将被氯丁胶乳胶粘剂所取代。建筑业中，聚氯乙烯地板与水泥板、木板与装饰板或天花板、墙壁与护墙镶板的粘接，均可用氯丁胶乳胶粘剂。国外高度发达的...     

羧基氯丁胶乳及其应用

美国Du Pont公司于70年代合成了一种新型的羧基氯丁胶乳。尔后苏联、日本及我国也先后发表了有关这种胶乳的论文和专利。本文主要介绍羧基氯丁胶乳的发展情况、产品开发及其应用。     

氯丁乳胶防护手套的研究

前言氯丁胶乳制品的橡胶弹性及物理机械性能与天然胶乳制品相似,并具有良好的耐热.耐候、耐臭氧、阻燃、耐化学介质腐蚀、耐油脂、气密性好、胶膜有良好的防α粒子及氚渗透等性能。氯丁胶乳成膜及加工性能也较好,是制造防护用品较好的胶乳之一。用氯     

乳液接枝法合成氯丁接枝胶MCR

用乳液接枝法合成了氯丁橡胶（ＣＲ）／甲基丙烯酸甲酯（ＭＭＡ）接枝共聚物ＭＣＲ,并通过盐水凝胶、水洗、干燥制得块干胶。研究了氯丁二烯种子胶乳转化率、分子量调节剂用量、残留氯丁二烯含量以及接枝反应温度、ＣＲ／ＭＭＡ比例对接枝率的影响。对接枝共聚物的粘接性能进行了测试。     

氯丁胶粘剂,涂料的研究进展

介绍了国内外氯丁胶粘剂、涂料领域的进展情况。建议开发羧基化氯丁橡胶新品种。     

顶空-毛细管气相色谱法测定地表水中氯丁二烯

建立了顶空-毛细管柱-FID气相色谱检测地表水中氯丁二烯的方法。采用HP-INNOWAX色谱柱分离,优化了分流比及顶空条件,氯丁二烯在1～90μg/L的范围内获得了良好的线性关系(r=0.9994),检出限(S/D=10)为0.01μg/L,地表水实际样品的加标回收率为98.5%～104.3%,相对标准偏差为2.45%。该方法操作简便、快速、灵敏度高,准确度和精密度均能满足检测要求,适用于地表水中氯丁二烯的检测。     

水性聚氨酯/丙烯酸酯复合乳液的合成及其性能研究

通过自由基乳液聚合,合成具有核壳结构的水性聚氨酯/丙烯酸酯复合乳液(PUA)。用IR、DSC和TEM对产物结构进行了表征,证明水性聚氨酯(PU)与丙烯酸酯单体在实验条件下发生了共聚反应;考察了PVA乳液及其胶膜耐热性和耐溶剂性。结果表明具有核壳结构的PUA乳液的各项性能均比水性聚氨酯有明显提高。     

Preparation of latex carriers for controlled release by concentrated emulsion polymerization

Spherical latexes of submicron diameter containing a model hydrophobic herbicide, namely, 2-(2,4-dichlorophenoxy)-propionic acid, were prepared by the concentrated emulsion polymerization method. A mixture of styrene, herbicide, and initiator was dispersed into a small amount of water (6% by volume based on the entire emulsion) containing surfactant, at room temperature. The heating at 40°C of the foam like gel thus obtained led to the formation of latexes containing the herbicide. It was found that the model herbicide dispersed in the polymer latex was released to water over a period of serveral weeks and that the amount released was strongly dependent upon temperature and latex concentration in water.     

Characterization of low-density polybutadiene latexes by sedimentation field–flow fractionation

A procedure based on sedimentation field–flow fractionation for physical characterization of polydisperse latexes is presented. The particle density, dimensions, polydispersity, size distribution and aggregation can be determined for both narrow and wide polydispersities. The procedure is applied to the sample case of polybutadiene latexes with density lower than water. The results are compared with independent measurements obtained by electron microscopy. The relevance of significant steps of the procedure, such as the nonequilibrium corrections, are discussed.     

模糊算法在氯丁二烯合成生产中的应用

氯丁橡胶生产是以氯丁二烯单体经过乳液聚合生产胶乳,而氯丁二烯则是以乙炔法制备。乙炔二聚得到的乙烯基乙炔(MVA)与氯化氢(HCl)合成生成氯丁二烯(CD),国内其合成塔反应运行基于人工操作,劳动强度大且稳定性差。在自动控制方面,设计了三维模糊(Fuzzy)控制器,与传统的PID串级控制相结合,实现了合成反应塔的优化控制。     

The application research of environment-friendly reactive surfactants in acrylate emulsion pressure sensitive adhesives

In this article acrylate pressure sensitive adhesive (PSA) latexes were synthesized via a pre-emulsion seeded semi-batch emulsion polymerization process with a conventional nonreactive surfactant (CO-436) and two polymerizable surfactants (traditional surfmer SE-10N and environment-friendly surfmer SR-10). The effects of surfactant contents on the particle size, zeta potential, electrolyte stability of the latexes and gel content, sol molecular weight (M_w, M_n), water absorption of the PSA copolymers were investigated. In addition, X-ray photoelectron spectroscopy (XPS) and contact angle measurements were used to characterize the latex films. The results showed that the particle sizes of latexes prepared with surfmers were smaller than their CO-436 containing counterparts. And the latexes prepared with surfmers had a lower storage stability than the one prepared with CO-436. However, surfmers can improve the electrolyte stability of the latex. Furthermore, the water resistances of the latexes prepared with surfmers were better than that of the latex with CO-436, which can be confirmed by water absorption, contact angle and XPS analysis. The results also indicated that the PSA prepared with SR-10 exhibited the highest gel content among the three surfactants. Finally, the effects of surfactants on the adhesive properties of the PSAs were also evaluated.     

Simple route to prepare stable liquid marbles using poly(ionic liquid)s

Individual “liquid marbles” were prepared by encapsulation of water droplets using flocculated polymer latexes stabilized with poly(ionic liquid)s. At first, the emulsion polymerization of poly(styrene) and poly(methyl methacrylate) using different poly(ionic liquid)s as stabilizers was investigated. Stable latexes composed of spherical polymer particles with sizes ranging between 300 and 700 nm as characterized by dynamic light scattering and scanning electron microscopy were obtained. Subsequently, the polymer particles were flocculated by anion exchange precipitation of the poly(ionic liquid)s provoked by the addition of lithium bis(trifluoromethanesulfonyl)imide salt. After simple filtration and drying processes, the flocculated latexes led to hydrophobic powders with similar micrograin size compared to the original latexes. Very stable “liquid marbles” were prepared by gently shaking water droplets of different volumes onto the hydrophobic powders. The morphology and stability of the liquid marbles were characterized by optical and confocal microscopy.     

Preparation and characterization of self-crosslinking fluorinated polyacrylate latexes and their pressure sensitive adhesive applications

Self-crosslinking fluorinated polyacrylate latexes based on butyl acrylate (BA), fluorine monomer octafluoropentyl methacrylate (OFPMA), self-crosslinking functional monomers acrylic acid (AA) and 2-hydroxyethyl acrylate (HEA) were synthesized by a monomer-starved seeded semi-continuous emulsion polymerization process. The latexes and their corresponding films were characterized by laser particle size analyser, Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), contact angle goniometer, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Results indicated that the particle size of the latexes and the gel content of the films were both independent of the amount of OFPMA employed. On the other hand, the particle size of the latexes decreased and the gel content of the films increased with the incorporation of AA and HEA as expected. Glass transition temperature (T_g) and the thermal stability of the copolymer were both improved gradually as OFPMA content increased. XPS, AFM and water contact angle measurement indicated that the fluoroalkyl groups had a tendency to enrich on the surface of the films. However, this enrichment of fluorine on the film surface was reduced after the introduction of self-crosslinking functional monomers into the system. Finally, the adhesive property of the latexes was evaluated for application as a pressure sensitive adhesive (PSA).