新型氢氧化物阻燃剂在胶粘剂领域中的应用进展

介绍了表面改性、超细化、以及与其他阻燃剂联用等途径对氢氧化物[Al(OH)3、Mg(OH)2]阻燃性能的影响,综述了新型阻燃剂在胶粘剂领域中的应用研究进展,比较了氢氧化物、改性氢氧化物、氢氧化物协同作用、氢氧化物和有机物协同作用等对各种胶粘剂阻燃性能和力学性能的改进效果,讨论了该领域研究中依然存在的一些不足,指出了今后的研究可能取得突破的几个方向。     

胺化改性木质素合成聚氨酯胶粘剂的研究

采用Mannich法对纯化木质素进行胺化改性,以提高其活泼氢数量和木质素的反应活性;然后以此作为部分聚乙二醇的替代物,将其与异氰酸酯反应合成PU(聚氨酯)胶粘剂。结果表明:胺化木质素中引入的氮含量约为2.64%,说明木质素的活性明显提高;当w(胺化木质素)=25%时,相应PU胶粘剂的湿胶接强度(1.53 MPa)达到GB/T 9846—2004标准中Ⅰ类胶合板的指标要求,并且其热稳定性能得以明显提高;胺化木质素可以取代部分聚乙二醇,其含量对胶粘剂的力学性能和热稳定性能影响显著。     

聚氨酯胶粘剂的研究与应用

简述了聚氨酯胶粘剂的发展状况、粘接特性,以及其存在的不足之处和相应的改性研究。对其在包装业、建筑业、汽车制造、木材粘接、书籍装订、印刷业等方面的应用进行了详细介绍。指出新型高性能、可生物降解的环保型聚氨酯胶粘剂是今后研究的重要方向。     

水性聚氨酯胶粘剂进展

介绍了水性聚氨酯胶粘剂的发展沿革 ,并就水性聚氨酯的制备方法、应用领域和发展动向作了论述。     

Improved dimensional stability of water-blown polyurethane foam with aluminum hydroxide and magnesium hydroxide

Water is eco-friendly and safe; thus, it used as a blowing agent in the fabrication of water-blown polyurethane (PU) foam. However, water-blown PU foam may experience dimensional instability due to shrinkage of the cells inside the foam. In order to reduce cell shrinkage due to the loss of CO₂ gas, vacuum formation is prevented in the closed-cell foam and the maximum reaction temperature must be raised to increase the degree of curing of the PU foam. In this study, two flame retardants, aluminum trihydrate (ATH) and magnesium dihydrate (MDH), were selected as additives to partially open the cells and increase the maximum reaction temperature. ATH and MDH were both effective for increasing the maximum foam reaction temperature and decreasing dimensional change. Notably, PU foams with 7.5 wt% ATH were the most dimensionally stable at both room temperature and high temperature. Moreover, the compressive strength and flexural strength of such foams were also improved compared to those of the foams without any additive.     

水性聚氨酯胶研究及应用

综述了国内外水性聚氨酯胶特点及应用,对水性聚氨酯乳液的制备及物理性质和聚氨酯胶层的性能进行分析和阐述。     

水性聚氨酯胶粘剂的开发与应用研究进展

简述了水性聚氨酯胶粘剂的定义,及其在植绒、多种层压制品、复合包装、木材粘接、鞋用以及压敏胶等方面的应用。介绍了水性聚氨酯胶粘剂的研究现状及多种改性方法的技术特点,如:丙烯酸酯改性、环氧改性、聚硅氧烷改性、纳米材料复合改性等。指出了水性聚氨酯胶粘剂的发展方向。     

聚氨酯胶粘剂耐热性研究进展

聚氨酯胶粘剂的耐热性差,大大限制了其在高温环境下的应用。综述了聚氨酯降解过程和降解机制的研究进展,重点论述硬段、软段及交联密度对聚氨酯耐热性的影响以及提高聚氨酯胶粘剂耐热性的方法。     

水性聚氨酯胶粘剂的研究与改性

水性聚氨酯(WPU)胶粘剂在耐水性、力学性能、粘接强度及热稳定性等方面不如溶剂型胶粘剂,故改性WPU势在必行。介绍了WPU胶粘剂的改性方法(包括改变多羟基化合物种类、调节离子中和程度、增加离子含量、形成互穿聚合物网络、选择适量的聚异氰酸酯固化剂和黏土浓度等),评述了WPU胶粘剂的国内外研究现状,指出了WPU胶粘剂的发展趋势。     

汽车用聚氨酯胶粘剂的研究进展

介绍了几种最常用的聚氨酯胶粘剂，如单组分湿固化聚氨酯挡风玻璃密封胶、粘接FRP和SMC材料用聚氨酯结构胶粘剂、汽车内饰用水性聚氨酯胶粘剂等在汽车制造和修理上的应用现状及各自的研究进展，展望了汽车用聚氨酯胶粘剂的未来发展前景。     

Optimizing the lignin based synthesis of flexible polyurethane foams employing reactive liquefying agents

The present work is focused on the optimization of a green process based on the employment of by‐products obtained from wood treatments as raw materials for producing flexible polyurethane foams. More specifically, lignin was employed in flexible polyurethane foams in order to partially replace the usual fossil polyols; therefore glycerol (GLY) and glycerin polyglycidyl ether (EJ 300) were used as the polyol fraction for lignin liquefaction. Polypropylene glycol triol was used as a chain extender in different ratios with liquefaction solvents, and polymeric diphenylmethane diisocyanate as an isocyanate fraction. Liquefaction of lignin was performed by microwave irradiation, thus reducing the processing time and energy required compared to present industrial production processes. All the foams were produced in controlled expansion through the adoption of a ‘one‐shot’ approach, using water as a blowing agent and with an isocyanate index (NCO/OH) of less than 100 to improve the flexibility of the foam. This approach allowed for the substitution of up to 12% of common petro derived polyol with commercial soda lignin. Finally, the foams were characterized, presenting properties that could be modulated as a function of lignin content, GLY/EJ 300 ratio and isocyanate index. The qualities of the foams were compatible with existing materials used for furniture and for the interiors of car seats and couches. © 2015 Society of Chemical Industry     

木质素在聚氨酯合成中的研究进展

木质素是木质纤维类生物质的第二大组分,木质素的高效、低成本转化是木质纤维素类生物质转化工艺实用化的技术关键。本文综述了利用木质素代替部分多元醇制备聚氨酯材料的两种主要途径：直接添加与改性添加。直接添加木质素包括碱木质素、木质素磺酸盐、硫酸盐木质素、溶剂型木质素等;改性添加木质素包括羟基化改性木质素、木质素硝化反应。最后指出了木质素基聚氨酯材料存在的不足和今后的发展方向。     

溶剂型聚氨酯鞋用胶的合成

研究了溶剂型聚氨酯鞋用胶粘剂,探索了合成的最优工艺条件,并进行了性能测试。胶粘剂采用PBA2000、BDO、TD180／20在溶剂丁酮下合成预聚体。最优条件为:扩链剂BDO与PBA摩尔比为0．4,异氰酸酯指数R控制在0．98-0．99范围,丁酮为首选溶剂,以二乙烯三胺和二丁基二月桂酸锡作复合催化剂,反应温度为75-85℃,反应时间为3h。合成的溶剂型聚氨酯胶粘剂具有良好的剥离强度和综合性能,添加(0．2-0．3)％的固化剂JQ-6能提高胶粘剂的最终剥离强度(20-30)％。     

Characterization of canola oil based polyurethane wood adhesives

A novel bio-based poly (ether ester) polyol containing both primary and secondary functional groups was synthesized from canola oil using a low cost and efficient procedure. In this work, use of the new canola oil derived polyol for the production of polyurethane (PU) adhesives was demonstrated. The canola oil based PU adhesives had similar or better adhesive properties in terms of lap shear strength than three commercial PU adhesives. The effect of NCO/OH ratio and temperature on adhesive characteristics on wood bonding was also evaluated by lap shear tests. It was found that the use of an elevated curing temperature (i.e. 100 °C), as well as optimized NCO/OH molar ratio (higher than 1.5/1.0), improved the wood adhesive properties. The overall chemical resistance of bio-based PU adhesives to cold water, acid and alkali was comparable to that of commercial PU adhesives whilst its resistance to hot water was superior.     

无溶剂双组分聚氨酯胶粘剂的研究进展

介绍了国内外无溶剂双组分聚氨酯胶粘剂的发展现状;阐述了无溶剂双组分聚氨酯胶粘剂发展的重要性;详细讨论了其在软包装、制鞋、医用等领域的应用状况,对其发展方向进行了展望。     

支化型水性聚氨酯胶黏剂的合成及性能

采用异佛尔酮二异氰酸酯(IPDI)、聚四氢呋喃醚二醇2000(PTMG2000)为原料,二月桂酸二丁基锡、1,4-丁二醇和2,2-二羟甲基丙酸分别为催化剂、小分子扩链剂和亲水单体,制得水性聚氨酯预聚体(PPU);接着以丙烯酸甲酯、二乙醇胺和三羟甲基丙烷为原料合成了超支化聚(胺-酯)(HPAE);最后制备出不同HPAE含...     

Preparation and properties of in‐situ polymerized polyurethane/stearate intercalated layer double hydroxide nanocomposites

The present work deals with the effect of stearate intercalated layered double hydroxide (St‐LDH) loadings on the morphological, mechanical, thermal, adhesive and flame retardant properties of polyurethane (PU)/St‐LDH nanocomposites prepared by the in situ polymerization method. X‐ray diffraction and transmission electron microscopy studies confirmed that exfoliation takes place at 3 wt% loading followed by intercalation at higher filler loadings in the PU matrix. The exfoliated structure has been further verified by atomic force microscopy. The measurements of stress‐strain, thermogravimetric analysis, dynamic mechanical analysis, lap shear strength and peel strength analysis showed that the nanocomposites containing 3 wt% St‐LDH exhibit excellent improvement in tensile strength (ca 175%) and log storage modulus (ca 14%), while PU/St‐LDH (5 wt%) possesses optimum improvement in glass transition temperature (ca 6 °C), lap shear strength (200%) and peel strength (130%) over neat PU. In addition, the gradual improvements in limiting oxygen index value with St‐LDH loading indicated the higher effectiveness in providing better barrier properties as well as better flame retardant behavior. Copyright © 2012 Society of Chemical Industry     

湿固化聚氨酯热熔胶研究进展

概述了目前反应型湿固化聚氨酯热熔胶的应用和研究方向，介绍了改善热熔胶的初粘强度、韧性、耐热性等性能的方法，以及国内外在聚氨酯预聚体、增韧树脂、增粘树脂、催化剂、添加剂等方面取得的一些研究进展。     

鞋用水性聚氨酯胶粘剂的影响因素探讨

简要介绍了一种制备聚氨酯水分散体的方法,着重探讨了反应时间、反应温度及中和剂用量等因素对聚氨酯胶粘剂性能的影响。     

六角片状氢氧化铝的制备

介绍了一种制备六角片状氢氧化铝的方法。对影响氢氧化铝晶体形状的因素如添加剂、铝酸钠溶液的分解温度、分解时间、分解率以及产物氢氧化铝的性质等进行了深入的研究。结果表明，控制适当的分解条件可以产出适用于造纸涂层材料的六角片状氢氧化铝，其平均粒度为2μm左右，白度≥95％，比表面积6.5-8m^2/g。