Effect of annealing on the properties of waterborne polyurethane adhesive containing urethane-based thickener

Different amounts of hydrophobically modified ethoxylated urethane-based thickener (HEUR) were added to improve the rheology of waterborne polyurethane adhesives. The thickened solid adhesive films were thermally annealed and characterised by IR spectroscopy, plate–plate rheology, dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Hydrogen bonds played a key role in the thickening mechanism of polyurethane dispersions containing urethane-based thickener, along with ionic adsorption and micelles formation between hydrophobic groups. The adhesion properties were measured from T-peel test of leather/polyurethane adhesive/vulcanised styrene-butadiene rubber joints. Optimal results were obtained when water in the waterborne polyurethane adhesive (just before joint formation) was removed under open air, while forced air drying impeded the complete removal of water. On the other hand, the thermal annealing did not greatly affect the rheological and thermal properties of the thickened polyurethanes.     

水性聚氨酯胶粘剂的研究进展

本文概述了水性聚氨酯胶粘剂的国内外研究现状,介绍了水性聚氨酯胶粘剂的制备方法,综述了水性聚氯酯改性研究进展,并展望了水性聚氯酯胶粘剂的发展方向.     

水性聚氨酯胶粘剂的研究进展

随着人们生活水平的提高和环保意识的增强,水性聚氨酯胶粘剂必然将取代溶剂型聚氨酯胶粘剂。论文综述了水性聚氨酯胶粘剂的制备方法、优点及存在的不足、改性方法及效果。最后对水性聚氨酯胶粘剂的发展现状进行了分析,并对其发展趋势进行了展望。     

Characterization of waterborne polyurethane adhesives containing different amounts of ionic groups

Waterborne polyurethane adhesives are an interesting alternative to the current solvent-based polyurethane adhesives used in footwear industry. In this study, different aqueous polyurethane dispersions were prepared by using the prepolymer mixing process. The ionic groups content in the polyurethane ionomer structure was varied by changing the amount (5 and 8 wt% (with respect to the prepolymer weight) of the internal emulsifier—dimethylolpropionic acid (DMPA). The decrease in the DMPA content slightly increased the particle size in number due to the decrease in both the hydrophilicity of the polyurethane ionomer, and the electrolytic stability of the aqueous polyurethane dispersion. Furthermore, the lower the DMPA amount, the lower the hard segment content in the ionomer and the higher the crystallinity of the polyurethane; however, the resistance to flow under temperature (i.e. thermoplasticity) was reduced. The resistance to thermal degradation of the polyurethane ionomer increased by decreasing the DMPA content due to the lower hard segment content. Finally, high initial adhesive strength was obtained and the adhesion to PVC increased as the DMPA content in the polyurethane ionomer decreased.     

丙烯酸酯改性交联型水性聚氨酯胶黏剂

以异佛尔酮二异氰酸酯(IPDI)、聚己二酸-1,4-丁二醇酯二醇(PBA)为主要原料、三聚氰胺为交联剂,合成了双键封端的交联型水性聚氨酯,再经过原位聚合制备了丙烯酸酯改性水性聚氨酯胶黏剂。利用FTIR、XRD、DLS、DTA、电子拉力机、邵氏硬度计等对材料结构与性能进行了表征。通过调节水性聚氨酯与丙烯酸酯的质量比、三聚氰胺的添加量,对产品性能进行了优化。结果表明,当水性聚氨酯与丙烯酸酯质量比为6∶4、三聚氰胺占水性聚氨酯质量为0.53%时,胶黏剂发生5%质量分数的降解温度可达到312℃,吸水率仅为4.69%,T-型剥离强度为5.3 kN/m。     

水性聚氨酯胶粘剂研究进展

介绍了水性聚氨酯胶粘剂制备方法,综述了水性聚氨酯改性研究进展,分析了提高水性聚氨酯胶粘剂的耐温性、耐水性、初粘性、润湿性及干燥速度的途径。     

水性聚氨酯的合成及改性

对水性聚氨酯胶粘剂的制备原理、方法及研拓进行了扼要介绍,并对其主要改性途径作了简要综。     

TDI水性聚氨酯胶粘剂的力学性能研究

以聚已内酯二醇(PCL220N)、甲苯二异氰酸酯(TDI-80)、二羟甲基丙酸(DMPA)为基料,以三羟甲基丙烷(TMP)为交联剂、环氧树脂(E-44)和松香为改性剂,制备出环氧树脂和松香改性的TDI水性聚氨酯胶粘剂。同时考察了环氧树脂(E-44)、松香和三羟甲基丙烷用量以及n(—NCO)/n(—OH)比值对TDI水性聚氨酯胶粘剂力学性能的影响。结果表明,当环氧树脂含量为5.73%,松香含量为8.92%,三羟甲基丙烷含量为2.68%,n(—NCO)/n(—OH)比值为1.23时,TDI水性聚氨酯胶粘剂的拉伸强度达到最大值为4.72 MPa。     

单组分水性聚氨酯复膜胶研制

溶剂型复膜胶一般为双组分,使用不便,而且含大量有机溶剂影响安全和环保。在软包装等领域,已经越来越多地被水性复膜胶产品替代。水性聚氨酯胶粘剂（WPU）为单组分,性能优良。本课题在丙酮法合成水性聚氨酯的技术基础上,分别采用熔融分散法和预聚体分散法合成WPU复膜胶。通过综合比较,性价比较好的预聚体分散法是合成WPU复膜胶的理想方法。用MDI-2460和TDI的混合异氰酸酯、聚酯多元醇PD-56、中和前预聚体一NCO含量在2．5％～30％时,可合成出性能稳定、单组分,对透明PE／PE镀铝、PET镀~／g／BOPP、透明PE／黑白膜等复合性能良好,初粘性可达2N／15mmV＇X上的WPU．基本不用熟化即可直接分切。     

国内改性水性聚氨酯胶粘剂研究进展

简要地概括了国内WPU(水性聚氨酯)胶粘剂的基本发展现况以及常用的合成方法,并且综述了目前阶段的丙烯酸酯、环氧树脂、有机硅、有机氟、纳米材料、超支化预聚体和复合改性WPU等方法。指出了现阶段WPU胶粘剂所存在的一些基本问题,譬如固含量较低(45%左右),干燥固化的速度较慢,润湿性、初黏性、耐水性、耐热性及贮存稳定性较差等一些问题,并展望了WPU胶粘剂的发展趋势。     

改性水性聚氨酯胶黏剂研究进展

介绍了水性聚氨酯胶黏剂的分类和合成方法。综述了水性聚氨酯的改性方法,包括丙烯酸酯改性、环氧树脂改性、有机氟改性、有机硅改性、纳米材料改性、复合改性和超支化预聚体改性。比较了各种改性方法的优势和缺陷,提出了每种方法改性的胶黏剂的适用领域,指出了水性聚氨酯胶黏剂的发展趋势。     

TDI水性聚氨酯胶粘剂的力学性能研究

以聚已内酯二醇(PCL220N)、甲苯二异氰酸酯(TDI-80)、二羟甲基丙酸(DMPA)为基料,以三羟甲基丙烷(TMP)为交联剂、环氧树脂(E-44)和松香为改性剂,制备出环氧树脂和松香改性的TDI水性聚氨酯胶粘剂。同时考察了环氧树脂(E-44)、松香和三羟甲基丙烷用量以及n(—NCO)/n(—OH)比值对TDI水性聚氨酯胶粘剂力学性能的影响。结果表明,当环氧树脂含量为5.73%,松香含量为8.92%,三羟甲基丙烷含量为2.68%,n(—NCO)/n(—OH)比值为1.23时,TDI水性聚氨酯胶粘剂的拉伸强度达到最大值为4.72 MPa。     

国外水性聚氨酯胶粘剂的研究进展

综述了水性聚氨酯(WPU)胶粘剂的特点以及国外近几年的研究动态,阐述了WPU的改性方法及机制。最后对WPU未来的发展方向进行了展望。     

改性水性聚氨酯及其粘接性能

综述了水性聚氨酯的改性方法,包括环氧树脂改性、丙烯酸酯改性、有机硅改性、有机氟改性、纳米材料改性、复合改性。比较了各种改性方法的优缺点,指出了水性聚氨酯胶粘剂所存在的问题,展望了水性聚氨酯胶粘剂改性发展趋势。     

聚碳酸酯型水性聚氨酯胶粘剂的合成及其性能研究

以甲苯二异氰酸酯、聚碳酸酯二元醇、2,2-二羟甲基丙酸等为原料合成了聚氨酯预聚体,通过KH-792[N-(β-氨乙基)-γ-氨丙基三甲氧基硅烷]对其进行双氨基扩链,并中和乳化合成PCDL-WPU(聚碳酸酯型水性聚氨酯)胶粘剂。研究结果表明:随着KH-792加入量的增加,制备的水性聚氨酯乳液凝胶温度最高可达89℃,乳液粒径变大,胶膜的吸水率降低;当加入w(KH-792)=2%(相对于水性聚氨酯乳液总质量而言)时,扩链的乳胶膜失重5%,分解温度最高可达271℃;当加入w(KH-792)=3%时,乳胶膜拉伸强度最高可达14.2 MPa,断裂伸长率呈下降趋势。     

PET薄膜用水性聚氨酯胶黏剂的制备

以聚对苯二甲酸-3-甲基-1,5-戊二醇酯二醇(TPA-1000)、聚乙二醇(PEG-2000)为软段、异佛尔酮二异氰酸酯(IPDI)、一缩二乙二醇(DEG)、2,2-二羟甲基丙酸(DMPA)为硬段,合成了一系列水性聚氨酯胶黏剂,用于PET薄膜的粘接。用傅里叶变换红外光谱(FTIR)表征了聚氨酯的结构,同时对聚氨酯胶膜进行了拉伸、耐水性、DSC和T型剥离等测试。结果表明,随着聚乙二醇含量的减少,大大增加了胶膜的力学性能和耐水性能,胶膜的热稳定性能有所提高,粘接强度先增加后减小,质量比TPA-1000∶PEG-2000=1∶1时,T型剥离强度达到最大值4.55 N/25 mm。     

双组分鞋用水性聚氨酯胶粘剂的制备

介绍一种用于制鞋的双组分水性聚氨酯胶粘剂,包括固含量35%、含磺酸盐的水性聚氨酯分散体及水可分散多异氰酸酯固化剂的制备.测试结果表明,制备的样品具有较低的活化温度(60～80 ℃),且具有很好的耐热性(耐温高达100 ℃),以及优越的粘接性能,未加固化剂的单组分水性聚氨酯剥离强度(PVC/PVC)高达9.0 N/mm以上.双组分的水性聚氨酯胶粘剂特别适合于鞋大底的粘合.     

水性聚氨酯胶粘剂在皮革工业中的应用

介绍了国内外皮革用水性聚氨酯胶粘剂（WPU胶）的发展状况;详细讨论了WPu胶在皮革上的应用;介绍了其应用所遇到的问题和解决方法,以及未来发展方向．     

Characterization of waterborne polyurethane/clay nanocomposite adhesives containing different amounts of ionic groups

A series of waterborne polyurethane (WBPU)/clay nanocomposite dispersions containing different amounts of 2,2-dimethylol propionic acid (DMPA) and clay were prepared. It was found that the properties of WBPU/clay nanocomposites were highly dependent on both clay content and DMPA content. The WBPU/clay nanocomposite dispersion with a higher clay content showed a larger mean particle size and a less negative zeta potential. The optimum clay content, which increased with increasing DMPA content, showed maximum tensile strength, Young's modulus and adhesive strength of WBPU/clay nanocomposite. The optimum clay concentrations for WBPU/clay nanocomposite samples containing 3.75, 5.41 and 6.17 wt% DMPA were about 0.5, 1.0 and 2.0 wt%, respectively.     

硅溶胶改性水性聚氨酯胶粘剂的研究

以TDI(甲苯二异氰酸酯)、聚酯多元醇、DMPA(二羟甲基丙酸)和硅溶胶等为原料制备了WPU(水性聚氨酯)胶粘剂,考察了硅溶胶掺量对其性能的影响。研究结果表明:随着硅溶胶掺量的不断增加,WPU的平均粒径逐渐增大,胶膜的拉伸强度、硬度、疏水性、耐水性和耐热性等逐渐提高,当w(硅溶胶)=5%(相对于胶粘剂总质量而言)时,复合薄膜的T-剥离强度(为5.0 N/25 mm)和断裂伸长率(为1 658%)相对最大,热稳定性略有提高。