溶剂型单组份聚氨酯胶粘剂

论述了溶剂型单组份聚氨酯胶粘剂的合成原理、合成方法及具体实验步骤，讨论了聚酯多元醇、扩链二元醇、异氰酸酯、溶剂等合成原产对胶粘剂性能的 影响，采用混合多元醇、两种扩链剂及ＴＤＩ与ＭＤＩ的组合，于混溶剂中，在加热条件下，逐步加聚而合成了主性能聚氨酯胶粘剂。经测试，该胶粘剂对牛皮、ＰＶＣ及ＰＵ人地均有较高的粘结力和剥离强度。     

橡塑复合软管用聚氨酯胶粘剂

]本文合成了具有低固量、高粘度的橡塑复合软管用聚氨酯胶粘剂，并考察了异氰酸酯指数、扩链剂、聚酯多元醇分子量等因素对该胶粘剂性能的影响。     

PVC装饰膜——金属板复合胶的研制

叙述了一种单组溶剂聚氨酯胶粘剂的合成，选用高结晶度的聚酯，异氰酸酯，扩链剂等为原料，同时采用氯醋树脂增粘，应用于ＰＶＣ彩色钢板生产流水线取得了满意的效果。     

无溶剂聚氨酯胶粘剂的研制

用脂肪／芳香混合二元酸和二元醇，以熔融缩聚法，合成了高分子量的聚酯，该树脂和聚醚多元醇与不同的异氰酸酯反应后作为胶粘剂的主剂，配合以合成的固化剂可用作塑／塑软包装复合用的无溶剂聚氨酯胶粘剂。     

复合膜用双组份聚氨酯胶粘剂的研究

本文确定了复合膜用双组份聚氨酯胶粘剂的组成成份，合成方法和工艺条件。讨论了聚酯多元醇分子是对胶膜力学性能的影响，NCO／OH（摩尔比值）对剥离强度的影响，多异氰酸酯组份的选择等。     

聚酯／聚醚型聚氨酯胶粘剂合成与性能研究

用不同的聚酯和聚醚为原料合成双组分聚氨酯胶粘剂，找到合成该胶粘剂的最佳工艺条件、工艺配方，考察了异氰酸酯及环氧树脂改性剂含量对胶粘剂机械性能的影响。实验结果表明，加入扩链剂可明显提高胶粘剂的机械强度：加入少量环氧树脂可明显提高胶粘剂的拉伸剪切强度，但使剥离强度降低了许多。     

鞋用聚氨酯胶粘剂的研究

探讨了研制高性能鞋用聚氨酯胶粘剂的技术路线,并介绍了聚酯多元醇和聚氨酯胶粘剂的合成工艺和方法。以聚己内酯、1,4-丁二醇和MDI等原料合成的鞋用聚氨酯胶粘剂,具有结晶度高、结晶速度快、内聚强度大等特点。讨论了聚酯二元醇、扩链剂、聚氨酯胶粘剂的分子量、异氰酸酯指数等对胶粘剂性能的影响。     

聚醚-聚酯型水性聚氨酯胶粘剂的合成

文章以聚醚二元醇、聚酯二元醇为软段,以甲苯二异氰酸酯、1,4-丁二醇等为硬段,采用两步法合成水性聚氨酯胶粘剂。研究了亲水基团的含量、异氰酸酯基(-NCO)与羟基(-OH)的摩尔比、聚醚/聚酯二元醇复配比例等对水性聚氨酯胶粘剂性能的影响。结果表明:亲水性基团含量1.5%～1.7%,异氰酸酯基与羟基的摩尔比为1.13～1.27,聚醚/聚酯复配比例为25/75～35/65时所合成的胶粘剂对BOPP/PET软包装复合材料有较佳的粘结性能。     

NA-3单组份聚氨酯胶粘剂的研制

扼要介绍了两个单组份聚氨酯胶粘剂的配方,制作工艺及其陡用方法。着重讨论聚酯当量、三元醇与二元醇的比例、异氰酸酯用量、苯酐量、硫化温度和时间、固含量和贮存期诸因素对胶粘剂剥离强度的影响,以及胶粘剂的耐水性和异氰酸酯用量对胶粘剂贮存稳定性的影响。     

鞋底喷漆用聚氨酯胶粘剂的研制

以聚酯多元醇作为软链段,以BDO、NPG和MDI作为硬链段一步法合成的鞋底喷漆用聚氨酯固体粒料,并溶解成15%固含量的胶粘剂。对聚酯多元醇的种类和分子量、扩链剂的用量、异氰酸酯的类型和异氰酸酯指数等作了讨论,结果表明:以邻苯二甲酸乙二醇-二甘醇酯,分子量在1500～2000时作软链段,新戊二醇和MDI为硬链段合成的聚氨酯胶粘剂在硬度、拉伸强度、透明度、软化点、附着力等方面能够满足鞋底喷漆用胶的要求。     

车身反光贴用聚氨酯胶粘剂的研制

以结晶性聚酯多元醇、直链二醇扩链剂、异氰酸酯和纳米助剂等为主要原料,制备出一种高粘接强度、耐老化性能优良的车身反光贴用PU(聚氨酯)胶粘剂。分析了聚酯多元醇的种类及其Mr(相对分子质量)、扩链剂、异氰酸酯、纳米助剂和催化剂等对PU胶粘剂性能的影响。结果表明:当结晶性聚酯多元醇为Mr=3 000的聚己二酸-1,4-丁二醇酯、扩链剂为1,6-己二醇(HDO)、异氰酸酯为1,6-己二异氰酸酯(HDI)、催化剂为有机铋类(BiCAT 8108)且w(催化剂)=0.03%(相对于反应物总质量而言)、n(聚酯多元醇)∶n(扩链剂)=1∶0.3和w(气相白炭黑)=0.2%～0.3%(相对于反应物总质量而言)时,PU胶粘剂的综合性能相对最好。     

湿固化异氰酸酯胶粘剂的消泡研究

采用氧化钙和二甲基硅油为消泡剂,对湿固化异氰酸酯胶粘剂进行消泡处理。结果表明,湿固化异氰酸酯胶粘剂用量100份,氧化钙用量2份或二甲基硅油用量3份时,消泡效果较好;当采用氧化钙2份和二甲基硅油3份作为混合消泡剂时,消泡效果更显著,胶粘剂各项指标均达到使用要求。     

Fabrication,performances, and reaction mechanism of urea–formaldehyde resin adhesive with isocyanate

In order to improve the performances of urea–formaldehyde (UF) resin adhesive and reduce formaldehyde emission, the isocyanate was applied to modify the UF resin adhesive. The effects of the composition ratio of the isocyanate/UF resin on the thermal stability and molecular structure of the composite adhesive were investigated by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analyzer. The results showed that the appropriate addition of the isocyanate into the UF resin is favorable to improve the performances of the composite adhesive due to the chemical cross-linking reaction of the isocyanate with UF. Furthermore, the reaction mechanism of the UF resin adhesive with isocyanate was analyzed in detail. These research results can be applied to aid materials engineering design for the development of new adhesive, quality assurance, and characterization assessment of durability.     

API固化反应过程的特性研究

使用不同性能的多官能度异氰酸酯作为水性高分子异氰酸酯(API)胶粘剂的交联固化剂,当主剂与交联固化剂混合均匀时,考察了不同种类羧基丁苯(SBR)胶乳及不同性能的交联固化剂对胶粘剂在固化过程中的黏度、胶接剪切强度和固化速率的影响,探索了API胶粘剂的固化反应机制,并且利用差示扫描量热(DSC)法研究了API胶粘剂的固化反应速率随温度变化的规律。研究结果表明,SBR-1的适用期达到2h,最大剪切强度为5.5 MPa;交联固化剂的种类是影响API胶粘剂适用期和胶接性能的重要因素,环境温度和胶液调配后的放置时间是影响API胶粘剂固化反应速率的重要因素。     

木材加工用单组分室温湿气固化异氰酸酯树脂的研制

详细研究了NOC/OH 摩尔比、聚氧化乙烯二醇分子量、聚氧化乙烯二醇含量、溶剂种类和树脂固体含量等主要因素对木材加工用单组分室温湿气固化异氰酸酯树脂胶性能的影响,最后优化出固化速度快、胶接效果优良、性能达到结构胶粘剂要求的单组分室温湿气固化异氰酸酯树脂胶粘剂的合成工艺。     

醇对单组分湿固化异氰酸酯胶粘剂性能的影响

研究讨论了不同分子量聚氧化乙烯二元醇对常温湿固化异氰酸酯胶粘剂性能的影响与作用,以及不同种类多元醇对胶粘剂湿固化特性的影响。聚氧化乙烯多元醇因含有亲水性较强的氧乙烯链,而适于制备湿固化胶粘剂;通过使用适量的催化剂可使一般异氰酸酯胶粘剂实现常温湿固化。     

Moisture-Curing Kinetics of Isocyanate Prepolymer Adhesives

The reaction between isocyanate-terminated prepolymers and atmospheric moisture produces urea linkages and results in a hydrogen-bonded network of linear high molecular weight polymers with adhesive properties. This study describes the synthesis of isocyanate-terminated prepolymers and investigates the use of in situ infrared spectroscopy as a technique for monitoring the chemistry of the polymerization reaction kinetics. In situ FTIR was successfully used as a means to monitor the residual isocyanate levels and the extent of the polymerization reaction. Frequency dependent dielectric sensing (FDEMS) using a thin, planar sensor has been used to monitor the reaction kinetics by monitoring changes in the mobility of ions in the reacting medium. A direct correlation of the extent of prepolymer cure was found using the normalized FTIR isocyanate absorbance spectrum and FDEMS imaginary permittivity at 500 Hz for the duration of the cure cycle. The results of this investigation demonstrate that FDEMS is an effective online method to monitor the extent of moisture cure in the bulk as well as in a coating or adhesive bondline.     

Moisture-Curing Kinetics of Isocyanate Prepolymer Adhesives

The reaction between isocyanate-terminated prepolymers and atmospheric moisture produces urea linkages and results in a hydrogen-bonded network of linear high molecular weight polymers with adhesive properties. This study describes the synthesis of isocyanate-terminated prepolymers and investigates the use of in situ infrared spectroscopy as a technique for monitoring the chemistry of the polymerization reaction kinetics. In situ FTIR was successfully used as a means to monitor the residual isocyanate levels and the extent of the polymerization reaction. Frequency dependent dielectric sensing (FDEMS) using a thin, planar sensor has been used to monitor the reaction kinetics by monitoring changes in the mobility of ions in the reacting medium. A direct correlation of the extent of prepolymer cure was found using the normalized FTIR isocyanate absorbance spectrum and FDEMS imaginary permittivity at 500 Hz for the duration of the cure cycle. The results of this investigation demonstrate that FDEMS is an effective online method to monitor the extent of moisture cure in the bulk as well as in a coating or adhesive bondline.