UV光固化水性聚氨酯丙烯酸酯膜的制备及性能研究

以异佛尔酮二异氰酸酯(IPDI)、聚己内酯二醇(PCL)、季戊四醇三烯丙基醚(PEAE)、二羟甲基丙酸(DMPA)为主要原料合成水性聚氨酯丙烯酸酯(WPUA),讨论了DMPA和PCL不同物质的量之比和不同异氰酸根指数(R值)对水性聚氨酯丙烯酸酯膜性能的影响.通过差示扫描量热分析、热重分析、吸水率以及拉伸强度等对WPUA...     

新品研发辑要

聚己内酯二醇型水性聚氨酯分散 液的合成和性能 用途:溶剂型聚氨酯具有优良的性能,可广泛用于涂料和胶粘 剂。聚己内酯二醇(PCL)是由内酯开环聚合而成的性能优良、独 特的聚酯,其开环反应只是由引发剂打开己内酯的环,与普通聚 酯合成时有水生成不同,因此反映单一、精确,所合成的的聚己 内酯比己二酸型聚酯有更窄的相对分子量分布。因此,由于其结 构的独特性,PCL可用于合成高性能的聚氨酯弹性体、胶粘剂、     

可降解水性聚氨酯的合成及其性能研究

以L-赖氨酸二异氰酸酯为硬段,聚ε-己内酯二元醇(PCL)为软段采用两步法合成了无毒、可生物降解型水性聚氨酯,研究了R值、扩链剂用量以及预聚温度对乳液及涂膜性能的影响。结果表明,当R值为1.5、扩链剂1,4-丁二醇用量为4%、预聚温度为80℃时所合成的水性聚氨酯乳液性能最优。力学性能测试表明其具有良好的机械性能,拉伸强度可达46.5 MPa;80 d后水解降解质量损失达42%,说明所制备的聚氨酯具有可降解性,是一种具有广泛应用前景的生物医用材料。     

双组分水性形状记忆聚氨酯的合成及其涂层胶应用研究

由聚己内酯二醇(PCL)和甲苯二异氰酸酯为主原料合成了端羟基水性聚氨酯,与可水分散多异氰酸酯交联剂组成双组分水性形状记忆聚氨酯(2K-WPU)涂层胶。研究了PCL相对分子质量和交联剂用量对2K-WPU薄膜的热性能、结晶性能以及对涂层织物的温敏透湿性能和耐静水压等性能的影响。结果表明,PCL相对分子质量高的2K-WPU结晶性好;选择合适的交联剂用量,可以使2K-WPU涂层织物显示较好温敏透湿性能,透湿量在35~50℃的温升范围内提高了4~8倍,耐静水压达到5 k Pa以上。     

单组分水性聚氨酯树脂产品设计基本规律的研究

以聚醚(N-220、N-210)、聚己内酯二醇(PCL)、甲苯二异氰酸酯(TDI)、异佛尔酮二异氰酸酯(IPDI)、六亚甲基二异氰酸酯(HDI)、蓖麻油(C.O.)、二羟甲基丙酸(DMPA)等为主要原料合成了一系列水性聚氨酯(WPU),研究软段类型、硬段类型、NCO/OH物质的量比对WPU耐水性、力学性能、涂膜手感的影响,总结了水性聚氨酯产品的设计规律。     

Mo尾矿表面处理时间对水性聚氨酯性能的影响

以异佛尔酮二异氰酸酯(IPDI)、聚己内酯二醇(PCL1000)等为主要原料,二羟甲基丁酸(DMBA)为亲水扩链剂制备水性聚氨酯,采用吐温80对Mo尾矿进行表面预处理后,再用其对水性聚氨酯膜材料进行改性。探讨Mo尾矿表面处理时间对水性聚氨酯膜的结晶性、耐水性、热稳定性和透光率等性能的影响。结果表明,随着Mo尾矿表面处理时间的增加,Mo尾矿与水性聚氨酯高分子复合体系的相容性得以改善,热稳定性和耐水性均有所提高,但透光率下降。     

环氧基多元醇改性水性聚氨酯的合成与性能研究

为提高水性聚氨酯的耐化学介质性能,使用顺酐（MA）与聚己内酯二醇反应生成顺酐聚己内酯二醇单酯（MP）,之后再与环氧树脂（E-51）反应,合成环氧基多元醇（EMP）最后以此为原料与聚己内酯二醇复配,制得环氧基多元醇改性水性聚氨酯（EWPU）。研究了不同反应,条件及 EMP用量对改性水性聚氨酯及涂膜性能的影响,通过红外光谱、粒径分析和热重分析对产物及涂膜进行了测试及表征。结果表明：通过在聚氨酯分子结构中引入具有柔性结构的环氧基多元醇,与未改性 WPU相比,所制备出的环氧基多元醇改性水性聚氨酯的耐介质性能明显提高,涂膜具有优异的柔韧性、附着力、硬度及耐热性等性能。     

低成本湿法合成革用聚酯型耐水解聚氨酯树脂的合成

以苯酐聚酯二元醇(PS)、聚己内酯多元醇(PCL)、1,4-丁二醇(BDO)、二苯甲烷二异氰酸酯(MDI)等为原料,合成了湿法革用聚氨酯树脂.分别研究了PS相对分子质量、PCL用量、硬段含量等对聚氨酯树脂膜的模量及其耐水解性能的影响.结果表明,PS和PCL复配可以制得耐水解性能优异,且成本较低的湿法合成革用聚氨酯树脂.     

基于聚己内酯多元醇混炼型聚氨酯的性能

采用两步法由两种相对分子质量的聚己内酯(PCL)和二苯基甲烷而异氰酸酯(MDI)反应生成混炼型聚氨酯生胶。研究在不同硬段含量下,相对分子量为1 000和2 000的聚己内酯对混炼型聚氨酯的影响。结果表明,随着硬段含量的增加,混炼型聚氨酯的强度、耐磨性能、耐老化性能、硬度和阻尼性能均上升,拉断伸长率和生胶耐低温性能下降。在相同硬段含量下,由聚己内酯1000合成的混炼型聚氨酯各种性能要优于聚己内酯2 000。     

第二十五讲 HMDI型阴离子水性聚氨酯的研制

本文以HMDI（二环己基甲烷二异氰酸酯）为主要原料合成了系列阴离子型水性聚氨酯乳液。探讨了异氰酸酯种类、大分子多元醇种类、NCO／OH摩尔比、后扩链剂IPDA、交联剂三羟甲基丙烷TMP等对水性聚氨酯性能的影响,测试了力学性能、耐水性能,并对产品进行了红外谱图的表征。     

Newly UV-curable polyurethane coatings prepared by multifunctional thiol- and ene-terminated polyurethane aqueous dispersions mixtures: Preparation and characterization

A series of newly developed UV-curable polyurethane coatings were prepared by blending multifunctional thiol- and ene-terminated polyurethane aqueous dispersions. The composition, structure, solution stability and mechanical properties of the title coatings were characterized in detail by FT-IR, photo-DSC and DMA measurements. It was found that the resulting polyurethane coatings showed good solution stability and high photopolymerization activity even after a long time (i.e. 1 month). The incorporation of a waterborne polyurethane chain into the both multifunctional thiols and ene monomers promoted their solution stability and avoided any reaction between thiols and ene groups as a result of their high reacting activity in non-aqueous systems. UV-cured films prepared by this method were found to exhibit excellent physical properties with improvements over what can be attained directly with current UV-curable urethane-acrylate based systems. This method allows for the preparation of high performance UV-curable polyurethane aqueous coatings based on thiol-ene chemistry systems.     

Polyester polyols for waterborne polyurethanes and hybrid dispersions

In this study, environmentally friendly polyester based polyurethane dispersions (PUDs) were synthesized using various combinations of isophthalic acid, adipid acid and maleic anhydride (IPA-AA-MA). A triangular empirical model was employed to optimize total number of experiments for optimal performance of polyurethane dispersions. In addition to PUDs, polyurethane/acrylate hybrid dispersions (PU/AC) were synthesized using graft copolymerization method to enhance the performance/properties of PUDs and for potential cost benefit.     

水性聚氨酯分散液的制备与性能研究

以含有磺酸盐基团的聚酯二元醇和异佛二酮二异氰酸酯（IPDI）为主要原料,以二羟甲基丙酸（DMPA）为亲水单体,制备了一组不同组成的水性聚氨酯分散液,经力学性能测定和差示扫描量热法（DSC）分析,研究了亲水单体含量、软段相对分子质量及磺酸盐基团含量对分散液及其胶膜性能的影响。结果表明：软段中磺酸盐基团含量及软段相对分子质量对分散液胶膜的热力学性能和胶黏剂的初粘强度都有影响。     

氧化淀粉在水性聚氨酯中的应用研究

利用氧化交联淀粉对水性聚氨酯（PU）进行改性,得到了一系列具有不同氧化淀粉含量的改性水性聚氨酯。测定了改性产物及其成膜后的各项性能。结果表明,加入氧化交联淀粉后,水性聚氨酯分散液的稳定性不变,但粘度下降,成膜后的耐水性能得到改善。当氧化淀粉用量为10%时,改性水性聚氨酯膜的各项性能达到最佳。     

浇注型耐热聚氨酯树脂材料的热性能和力学性能

聚氨酯（PU）作为一类合成高分子材料具有许多优异性能和优良的加工性能,被广泛地应用于国防、医疗、食品等行业,然而普通聚氨酯耐热性能较差．一般认为,PU弹性体在80℃以下能长期使用,短期使用温度不超过120℃,因而使其应用受到了限制．关于提高聚氨酯弹性体耐热性能的研究已有许多报道．国外不断有耐热PU材料实用专利推出,而国内在这方面的报道还是不多见．     

Preparation,mechanical properties of waterborne polyurethane and crosslinked polyurethane‐acrylate composite

The waterborne polyurethane (PU) prepolymer was first prepared based on isophorone diisocyanate, polyether polyol (NJ‐210), dimethylol propionic acid (DMPA), and hydroxyethyl methyl acrylate via in situ method. The crosslinked waterborne polyurethane‐acrylate (PUA) dispersions were prepared with the different functional crosslinkers. The chemical structures, optical transparency, and thermal properties of PU and PUA were confirmed by Fourier transform infrared spectrometry, ultraviolet–visible spectrophotometry, and differential scanning calorimetry. Some physical properties of the aqueous dispersions such as viscosity, particle size, and surface tension were measured. Some mechanical performances and solvent resistance of PUA films were systemically investigated. The experimental results showed that the particle sizes of the crosslinked PUA aqueous dispersions were larger than the PU and increased from 57.3 to 254.4 nm. When the ratios of BA/St, BA/TPGDA, and BA/TMPTA were 70/30, PUA films exhibited excellent comprehensive mechanical properties. The tensile strength and elongation at break of the film were 2.17 MPa and 197.19%. When the ratio of BA/St was 30/70, the film had excellent water resistance and was only 6.47%. The obtained PUA composites have great potential application such as coatings, leather finishing, adhesives, sealants, plastic coatings, and wood finishes. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Synthesis of reactive self-adhesive branched polyurethane dispersant for textile pigment printing

A series of reactive branched polyurethane dispersants (BPUs) were successfully synthesized based on epoxy as reactive group and nitrogen-containing heterocycles as anchoring group. The branched polyurethane was adopted an ''A₂ + B₃'' approach with diisocyanate prepolymer and trimethylolpropane. The structure, molecular weight, and thermodynamic property of BPUs were characterized. The pigment dispersions were prepared with BPUs as the dispersant by ball milling, and then the characteristic parameters such as pigment particle size, viscosity, stability, color properties, and fastness were evaluated. Excellent dispersing performances were observed that the particle size of five dispersions were below 200 nm, with the viscosity as low as 6–9 mPa·s. It is worth noting that the pigment dispersion prepared by BPU exhibited excellent stability and self-adhesive performance. These dispersions were printed on cotton fabrics without adhesives, their water washing fastness was approximately grade 4. And the dry rubbing and wet rubbing fastnesses were 3 and 2–3, respectively.     

Synthesis,characterization, and comparison of polyurethane dispersions based on highly versatile anionomer,ATBS, and conventional DMPA

Polyurethane dispersions (PUDs) are one such class of coatings that comply well with stringent VOC regulations. In this study, PUDs were prepared as aqueous dispersions using a new highly versatile crosslinkable anionomer, 2-acrylamido 2 methylpropanesulfonic acid (ATBS), which is commercially available, yet not explored by the coating industry. The influence of this novel anionomer on the performance properties of polyurethane resins was evaluated by comparing performance/properties of this newly synthesized PUD with dispersion based on conventional anionomer, DMPA. Analyses of their physico-chemical and thermo-mechanical properties revealed that PUD based on ATBS showed comparatively much better thermal, mechanical, and chemical and coating properties than the PUD based on DMPA anionomer.     

Synthesis and properties of anionic aqueous polyurethane dispersions

A series of aqueous polyurethane dispersions containing pendant carboxylate anion as the hydrophilic were synthesized, and the particle size and the mechanical properties of the dispersions were measured. The effects of the molar ratio of NCO/OH groups or the other functional groups on the chemical structure and the properties were discussed. The particle size mainly depended on the molar ration of the functional groups. The ? NH groups in urethane and urea linkage formed hydrogen bonding with the carbonyl group (C?O) of other urethane group in the hard segments or ether group (C? O? C) in the soft segments. Fourier transform infrared (FTIR) analysis showed that the higher molar ratio of NCO/OH concentrated the ? NH group, leading to the hydrogen bonding, which resulted in the increasing mechanical strength of the polyurethane. The tensile testing and dynamic mechanical analysis measurement revealed that the pendant carboxylate anion made the modulus and the stiffness of the polyurethane increase. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 3461–3465, 2002     

Development of waterborne UV-A curable clear coat for car refinishes

The development of a waterborne UV-A curable clear coat for car refinish application is described. The clear coat formulations are based on specially developed acryloyl or maleimide functional polyurethane dispersions. The functional PUR dispersions are characterized by a relatively low molecular weight, a high CC functionality and an optimized amount of poly(ethylene oxide). These characteristics are necessary for obtaining optimal film formation which results in good appearance and other film properties. It was found that poly(ethylene oxide) had a positive effect on surface cure when irradiated with UV-A light (less influence of oxygen inhibition). The synthesis of PUR dispersions and their performance in clear coats are described, including several aspects on film formation (conversion of CC, AFM measurements) and film properties (durability, physical and chemical properties).