苯酐聚酯多元醇制备高强度聚氨酯胶粘剂

用苯酐聚酯多元醇制备了双组分聚氨酯胶粘剂,其中A组分为含苯酐聚酯多元醇和聚醚多元醇的含羟基组分．B组分为含PADI的固化剂。分别讨论了不同羟值和官能度的苯酐聚酯多元醇和聚醚多元醇的选择及重钙添加量对性能的影响,得到最优化的配方。测试了双组分聚氨酯胶粘剂主要性能。结果显示,制备的双组分聚氨酯胶粘剂具有操作方便、适用期长、粘接强度高、抗冲击性能好等特点,可以满足金属与金属、金属与塑料等结构粘接的要求。     

废旧聚氨酯的醇解与利用

以1，2-丙二醇醇解废旧聚氨酯得到多元醇混合物和胺类化合物，红外光谱法分析了多元醇混合物。以多元醇混合物为基础原料，与甲苯二异氰酸酯(TDI)合成聚氨酯预聚体作为聚氨酯胶粘剂的甲组分(羟基组分)，再用TDI的乙酸乙酯溶液作为聚氨酯胶粘剂的乙组分(固化剂)，从而形成一种双组分聚氨酯胶粘剂。研究了两组分的配比关系及各种添加剂用量对聚氨酯胶粘剂性能的影响。     

打印涂层用聚氨酯胶粘剂的合成

以混合低聚物二醇、异佛尔酮二异氰酸酯、异佛尔酮二胺等为原料合成了固含最为45%的打印涂层用聚氨酯胶粘剂.讨论了不同种类的多元醇、二异氰酸酯及异氰酸酯与多元醇的物质的量比、不同小分子扩链剂对聚氨酯胶粘剂性能的影响,同时采用FT-IR、托力仪等测试仪器对聚氨酯胶粘剂进行结构表征、力学、硬度和耐水性测试.结果表明:选用聚酯PNA、聚氧化丙烯二醇PPG混合多元醇,n(-NCO):n(-OH)=4,m(1,4-丁二醇):m(新戊二醇)=6:2时,合成的聚氨酯胶粘剂膜硬度可达61,透明度良好,并有良好的抗粘连性和耐水性,满足打印涂层用聚氨酯胶粘剂的要求.     

聚氨酯丙烯酸酯软段结构对UV胶性能的影响

以几种不同结构的多元醇、异佛尔酮二异氰酸酯(IPDI)和丙烯酸羟乙酯为原料,合成了多种聚氨酯丙烯酸酯预聚物(PUA).按照同样比例的单体、引发剂及其他助剂配制成光固化胶粘剂(UV胶),考察了聚氨酯中多元醇结构对UV胶固化速度、黏结强度、胶膜性能等的影响.结果表明,聚氨酯结构中软段结构对UV胶粘剂性能影响比较大,合理地选...     

Reichold公司成立多元醇业务小组

美国Ｒｅｉｃｈｏｌｄ公司成立一个业务开发小组 ,以促进其多元醇产品的销售。该多元醇小组的作用包括 :增加该公司生产的多元醇的市场销售额 ,加速及促进自产多元醇的内部使用 ;利用该公司的技术能力 ,开发独特的多元醇 ,研制新附加值的聚氨酯浇注制品、涂料及胶粘剂 ;提高Ｒｅｉｃｈｏｌｄ公司在多元醇市场的地位 ,创造下游机会。Ｒｅｉｃｈｏｌｄ公司在全球定位于提供完整的文化及线性聚酯多元醇系列产品 ,以Ｐｏｌｙｌｉｔｅ的商标出售 ,用于聚氨酯领域 ,用途包括软泡、乳液、浇注制品、载体树脂、涂料、稀释树脂、胶粘剂、热塑性聚氨酯…     

水性聚氨酯胶粘剂的研制

以低聚物多元醇、二异氰酸酯和二羟甲基丙酸为主要原料制备了一种阴离子水性聚氨酯胶粘剂。探讨了不同种类的多元醇和异氰酸酯对预聚体的合成和乳液性能的影响,实验中发现用三乙胺做中和剂时存在着一个临界浓度。选用多种助剂最后配制得到了综合性能优良的水性聚氨酯胶粘剂。     

胶粘剂

医用聚氨酯胶粘剂 Bristol-Myers Co.开发了一种新型聚氨酯胶粘剂,专用于医学如创伤橡皮膏、创伤包敷料、纱布绷带和吻合器械等。 该胶粘剂系压敏型胶粘剂,是由聚醚多元醇、聚酯多元醇或它们的混合物(羟基至少为1.75mol/分子)与脂肪族、脂环族、芳香族或它们     

耐高温聚氨酯复膜胶的研究

简要介绍了聚酯多元醇及聚氨酯胶粘剂羟基组份的制备工艺,同时将制得的聚氨酯胶粘剂羟基组份配合拜耳低游离异氰酸酯固化剂与日本进口的同类型产品进行应用性能对比。     

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。     

橡胶与金属粘接用NA-1聚氨酯胶粘剂的合成

本实验采用二元酸和多元醇制备聚酯多元醇,然后加入一定量的乙酸乙酯溶解,作为A组分。用多元醇和多异氰酸酯为原料,用乙酸乙酯作溶剂,在65±5℃下反应生成预聚物,作为B组分。A、B两组分可按不同配比组成NA-1聚氨酯胶粘剂。考察了聚酯多元醇的当量,A、B两组分配比,固化时间与温度以及水对该胶粘剂性能的影响。提出了适宜的配方和工艺条件,该产品特别适用于胶辊及其他金属衬里设备的浇注型聚氨酯与金属的粘接。     

Effect of different rapeseed-oil-based polyols on mechanical properties of flexible polyurethane foams

Two rapeseed-oil-based polyols were synthesized by partial epoxidation of the double bonds in fatty acid chains and overall opening oxirane rings by using diethylene glycol. Flexible polyurethane foams with varied isocyanate index and modified by partial substitution of petrochemical polyether triol with rapeseed-oil-derived polyols were obtained. Bio-polyols: Polyol I and Polyol II differed in functionalities (2.5 and 5.2, respectively) and hydroxyl values (114 and 196 mg KOH/g, respectively). Influence of the bio-polyols on mechanical properties, resilience, apparent density, and cellular structure of synthesized foams was investigated. Compression properties were examined and compared via determining compression values and compression stress—strain characteristics, as well as tensile strength and elongation at break were estimated. Foams modified with Polyol I had higher values of resilience and elongation at break than those with Polyol II, while higher tensile and compression strength and superior cell structure were observed in the case of foams modified with Polyol II. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

用纳米SiO2改进环氧树脂胶粘剂性能的研究

对用无机纳米微粒改性环氧树脂胶粘剂的理论依据、无机纳米微粒的分散原理进行了分析和叙述。依据此理论,用混合法将纳米SiO2对环氧树脂胶粘剂进行了改性试验,取得了提高环氧树脂胶粘剂多项性能的良好结果。说明用无机纳米微粒改性环氧树脂胶粘剂是一个行之有效的方法。     

聚醚多元醇羟值测定方法的改进

通过对聚醚多元醇羟值测定方法的改进,使聚醚多元醇中的羟值测定时间由原来的2h缩短为30min。改进后的方法具有简单、快速、准确等优点。     

室温固化双组分环氧树脂结构胶的研究

以环氧树脂(EP)和二乙烯三胺基甘油正丁基醚(593)固化剂为基体,以自制底胶和预处理过的石英粉为填料,制取室温固化双组分EP结构胶。研究了不同配方、粘接工艺对EP结构胶粘接性能的影响。实验结果表明,该EP结构胶在室温条件下具有优异的粘接性能,用于粘接45#钢/钢时,其室温拉伸剪切强度为27.4MPa;该EP结构胶浇铸体的拉伸强度为44.6MPa,拉伸模量为6.82GPa;一种新的自制底胶和经KH-560偶联剂处理过的石英粉填料是拉伸剪切强度显著提高的关键因素。     

汽车同步器齿环用耐高温结构胶膜的性能研究

同步器齿环与碳纤维耐摩擦材料是通过胶粘剂实现粘接,而胶粘剂耐高温性能的优劣则是决定其使用寿命的决定性因素。本文研究了环氧树脂E-51体系、环氧树脂AG80体系以及基材表面处理工艺对于结构胶膜耐高温性能的影响,采用熔融共混法制备了胶粘剂并以玻璃纤维布为背衬制备了耐高温结构胶膜。采用高低温拉力机对不同体系制备的结构胶膜进行了常温、200℃高温的钢材搭接剪切强度的测试。结果表明,对于E-51体系,提高体系交联密度可显著增大常温剪切强度,但高温剪切强度明显下降;对于四官能度的AG80体系,AG80的用量是影响其高温性能的主要因素,同时基材表面喷砂水洗处理后可显著增大结构胶膜与基材粘接有效面积,进而显著改善高温性能。所制备的结构胶膜较常用胶粘剂使用更加便捷,耐高温性能优良,满足同步器齿环使用要求。     

Influence of the mechanical behaviour of different adhesives on an interference-fit cylindrical joint

Hybrid adhesive joining techniques are often used in many industrial sectors to design lightweight structures. A hybrid adhesive joint results from the combination of adhesive bonding with other traditional joining methods such as welding and mechanical fastening, with the aim of combining the advantages of the different techniques and overcoming their drawbacks.This study focuses on the interference fitted/adhesive bonded joining technique. In this application, two cylindrical components are coupled together by inserting one into the other, after having placed an adhesive between them. Generally anaerobic acrylic adhesives, also known as “retaining compound” are used for this application. However the effect of the adhesive nature and of its mechanical and adhesive responses on the performance of the hybrid joint is still unclear. The aim of the present research is to improve the understanding of the behaviour of different adhesives, including rigid epoxies and flexible polyurethanes, in the presence of an interference-fit. Static strength of bonded and unbonded interference fit joints have been compared in order to investigate the role of the different adhesives.     

Intensity of singular stress field (ISSF) variation as a function of the Young's modulus in single lap adhesive joints

Employing mixed adhesive joints has been proven to be very useful. This type of joint leads to improved performance by increasing strength and decreasing stresses in critical areas of the joint. In the same way, the use of the Intensity of Singular Stress Field (ISSF) has been shown to be suitable for adhesive joint calculation, since the adhesive strength can be controlled by the ISSF at the interface end. Four finite element models have been created by combining two epoxy adhesives with different mechanical properties, and therefore with different Young's moduli. New mixed adhesive joints have been compared with respect to only-one adhesive joints in terms of the ISSF. The results show a clear improvement with one of the configurations of mixed adhesive joints. A significant decrease of 35.64% in the ISSF is obtained compared to the only-one adhesive configuration.     

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。     

预聚物对UV固化胶黏剂性能的研究

预聚物作为胶黏剂的主要成膜物质,它的性能基本决定了固化后胶黏剂的主要性能.采用不同类型的丙烯酸酯共混聚合的方法研究了预聚物对紫外光固化胶黏剂性能的影响.主要讨论了预聚物的种类、含量及复配对胶黏剂的固化速率、黏附力及粘接强度的影响.实验发现预聚物的种类和含量是胶黏剂的主要影响因素,脂肪族聚氨酯丙烯酸酯6148J和改性脂肪族聚氨酯丙烯酸酯6079性能较好,且二者比列为3:7,含量为50%时胶黏剂综合性能较好.