可剥离垫片用胶粘剂的研制与性能

介绍了可剥离垫片用胶粘剂的合成。重点讨论了引发剂用量、单体含量等因素对胶粘剂合成反应及粘接性能的影响。并测试了铝可剥离垫片的各种性能及胶粘剂的稳定性能。     

耐高温复合薄膜用聚氨酯胶粘剂的研究

介绍以芳烃聚酯多醇为主体的双组份 ,干式复合用聚氨酯胶粘剂的合成方法及其性能。讨论了己二酸 苯酐配比及反应温度、时间对合成芳烃聚酯及胶粘剂性能的影响。     

高性能磁记录材料用聚氨酯胶粘剂的研究

用脂肪族二元酸与二元醇以熔融缩聚合成了适用于聚氨酯胶粘剂用的聚酯二醇，接着在环己酮中与二苯甲烷二异氰酸酯（MDI）和扩链剂，采用溶液一步法合成了适合于磁浆专用的高性能聚氨酯胶粘剂。讨论了原料比、投料次序、反应温度和时间、和溶剂种类等对聚氨酯胶粘剂性能的影响。考查了磁记录材料对胶粘剂性能的特殊要求。     

大豆蛋白乳液胶粘剂的研制

由于以石化原料合成的胶粘剂在生产和使用过程中会对环境带来不良影响,近年来采用可再生资源,如大豆蛋白合成环保型胶粘剂已成为发展趋势。以尿素和亚硫酸钠改性大豆分离蛋白(SPI),并与醋酸乙烯酯(VAc)等复合单体在过硫酸铵(APS)引发下进行接枝共聚反应,合成了性能较好的VAc/SPI接枝共聚乳液胶粘剂,降低了原料成本。通过正交实验研究了不同的反应条件对该乳液胶粘剂性能的影响,优化的反应条件是采用半连续乳液聚合工艺,以改性SPI自身作为保护胶体,改性剂尿素的浓度为3mol/L,复合单体与SPI的质量比为2.0:1,反应温度为68℃,共聚反应时间为4～5h。由此制得的乳液胶粘剂具有良好的综合性能。     

新缩醛工艺制备书刊有线装订胶粘剂和地板胶粘剂

通过改变传统的ＰＶＡ缩甲醛化反应的条件和工艺，合成了性能优良的书刊有线装订胶粘剂和地板胶粘剂。     

双组份高强度聚氨酯胶粘剂的研制及应用

介绍了双组份高强度聚氨酯胶粘剂的合成及应用,研究了双组份胶粘剂的合成工艺及性能,阐述了反应原理实验操作、使用方法及工艺要求,并对实验结果进行了讨论,探讨了多端羟基聚氨酯当量固化温度和时间,对胶粘剂的耐水性能以及乙组份固含量和贮存时间对粘接性能的影响进行了考察。     

新缩醛工艺制备书刊有线装订胶粘剂和地板胶粘剂

通过改变传统的ＰＶＡ缩甲醛化反应的条件和工艺，合成了性能优良的书刊有线装订胶粘剂和地板胶粘剂。     

复合布用单组分聚氨酯胶粘剂的研究

单组分湿固化聚氨酯胶粘剂是一种理想的用于布复合的粘接材料。本文研究了单组分湿固化聚氨酯胶粘剂合成中的规律,如NCO/OH比例对反应及产品性能的影晌以及固化条件对粘接性能的影响。其中还探讨了该胶粘剂的粘接原理。     

高粘度聚乙烯醇缩甲醛胶粘剂生产工艺条件的选择

研制了高粘度聚乙烯醇缩甲醛胶粘剂 ,探索了物料用量和反应条件对胶液性能的影响 ,合成了性能较为优良的胶粘剂 ,其粘度增加到 2 0Pa·s,该产品在耐水性、稳定性、毒性等方面都有显著改善     

橄榄油-脲醛树脂胶的固化特性研究

以甲醛与尿素缩聚反应生成脲醛树脂为基础,加入橄榄油与三乙醇胺形成的三乙醇胺皂化物,合成了橄榄油-脲醛树脂胶粘剂,主要探讨了胶粘剂的固化特性。研究结果表明:橄榄油的加入延长了脲醛树脂胶粘剂的固化时间,增大了固化反应起始反应温度和放热峰值温度。此外,橄榄油的加入降低了胶膜硬度的同时,大幅提升了胶粘剂的耐水性能。     

聚氨酯胶粘剂的研究进展

综述了聚氨酯胶粘剂的合成、特性和种类。概述了近年来国内外聚氨酯胶粘剂的研究和应用进展,重点介绍了聚氨酯胶粘剂的发展动态和几类主要的聚氨酯胶粘剂,并对其进行了分析,结合实际情况对今后聚氨酯胶粘剂的发展方向作出了展望。     

双组分丙烯酸酯胶粘剂的研制

丙烯酸酯压敏胶粘剂作为A组分,聚氨酯胶粘剂作为B组分,把A组分和B组分混合,制备双组分丙烯酸酯胶粘剂。丙烯酸酯压敏胶粘剂则是由丙烯酸羟乙酯等单体通过溶液聚合而成的。研究了丙烯酸羟乙酯的用量及A组分与B组分的配比对双组分丙烯酸酯胶粘剂性能的影响。     

The Effect of Adhesive Thickness on the Mechanical Behavior of a Structural Polyurethane Adhesive

One parameter that influences the adhesively bonded joints performance is the adhesive layer thickness. Hence, its effect has to be investigated experimentally and should be taken into consideration in the design of adhesive joints. Most of the results from literature are for typical structural epoxy adhesives which are generally formulated to perform in thin sections. However, polyurethane adhesives are designed to perform in thicker sections and might have a different behavior as a function of adhesive thickness. In this study, the effect of adhesive thickness on the mechanical behavior of a structural polyurethane adhesive was investigated. The mode I fracture toughness of the adhesive was measured using double-cantilever beam (DCB) tests with various thicknesses of the adhesive layer ranging from 0.2 to 2 mm. In addition, single lap joints (SLJs) were fabricated and tested to assess the influence of adhesive thickness on the lap-shear strength of the adhesive. An increasing fracture toughness with increasing adhesive thickness was found. The lap-shear strength decreases as the adhesive layer gets thicker, but in contrast to joints with brittle adhesives the decrease trend was less pronounced.     

我国胶粘剂工业现状及应用进展

介绍了我国胶粘剂工业的现状以及各类胶粘剂的应用进展,其中主要包括环氧树脂胶粘剂,聚氨酯胶粘剂,有机硅胶粘剂,以及耐高、低温等特种胶粘剂,并对国内胶粘剂市场的前景作出了展望。     

In situ synthesis of novel biomass lignin/silica based epoxy resin adhesive from renewable resources at different pHs

Novel biomass lignin/silica composites were prepared and isolated from rice husk renewable resources at different pHs. Selective precipitation was achieved by decreasing the solution pH from 9.5 to 1.5. When pH reached 3.5, the ratio of lignin and silica mostly achieved the maximum of 1:1. We selected lignin/silica composites as reactants to replace 20?wt% bisphenol A in preparing epoxy resin. The cured novel biomass function lignin/silica-based epoxy resin adhesive showed the highest adhesive strength up to 2.68?MPa, which displayed 123% of neat epoxy resin adhesive. In addition, lignin/silica composites were depolymerized through the hydrothermal method by NaOH as a catalyst, which was used as reactants to replace 35?wt% bisphenol A in the process of in situ synthesis of epoxy resin adhesive. At this point, the high epoxy value (1.42?wt%) and large adhesive strength (3.98?MPa) of lignin/silica-based epoxy resin adhesive were obtained, which adhesive strength was 183% of neat epoxy resin adhesive. The results demonstrated that depolymerized lignin/silica-based epoxy resin adhesive showed the higher epoxy value and the adhesive strength compared with neat epoxy resin adhesive and lignin/silica-based epoxy resin adhesive. Their function in epoxy matrix resulted in better processability.     

有机硅季铵盐单组分环氧树脂胶的制备

研究了利用有机硅季铵盐在热分解时释放叔胺作为环氧树脂固化剂，释放多官能活性有机硅作为交联剂，从而达到潜固化和改性环氧树脂的目的。     

Studies on tack of pressure-sensitive adhesive tapes: On the relationship between pressure-sensitive adhesion and surface energy of adherends

The relationship between wetting and pressure-sensitive adhesion was studied using an adhesive composed of poly(butyl acrylate) and various adherends of different surface tension. The amount of adhesive deposit was determined quantitatively by tracer technique although the unbonding process was apparently observed as interface failure. The adhesive force and amount of deposit were both dependent on the critical surface tension of the adherends. Maximum tack value and contamination were observed with adherends whose critical surface tension was close to that but a little higher than that of the adhesive. The adhesive force obtained was lower than cohesive strength of adhesive. From this evidence, a mechanism for pressure-sensitive adhesion was discussed: the bond breaks in the addesive mass around the very minute spots where interaction is at work between adhesive and adherend. Inasmuch as the density of the minute spots per unit area depends on the surface tension, the adhesive force also depends on the surface tension.     

黏附剂对预涂厌氧胶性能的影响

以黏附剂种类及含量作为试验因素,以预涂厌氧胶A组分和预涂螺栓的外观、预涂螺栓装配时的状态、初固时间和扭矩强度等为考核指标,采用单因素试验法优选出制备预涂厌氧胶的最优方案。研究结果表明:当PVP(聚乙烯吡咯烷酮)-K30为黏附剂、w(PVP-K30)=2.0%(相对于厌氧胶总质量而言)时,预涂厌氧胶的综合性能相对最好。     

Mode-l Fracture Behaviour of Adhesive Joints. Part II. Stress Analysis and Constraint Parameters

The constraint effect on the fracture behaviour of a rubber-modified epoxy was investigated using compact tension (CT) adhesive joints. An elastic-plastic finite element analysis was conducted to evaluate the stress distribution ahead of the crack tip in the bulk adhesive and adhesive joints of different bond thickness. The models with sharp and finite radius crack tips were evaluated in the analyses. The constraint effect of adherends on the stress triaxiality ahead of the crack tip in the adhesive joints were discussed. The constraint parameters were investigated using the J-Q theory and the J-CTOD relationship. It was found that as the adhesive thickness was increased, the stress triaxiality ahead of the crack tip was relieved by the remarkable deformation of the adhesive material. Similarly, the crack tip constraint was reduced with increasing bond thickness so that the fracture energy increased towards the value of the bulk adhesive. A higher constraint was associated with a lower fracture energy and vice versa. Furthermore, the J-integral did not have a unique relationship with the crack-tip opening displacement (CTOD) for different adhesive bond thickness, as this depends on the constraint around the crack tip. The results of this study will help improve reliability assessment of adhesive joints in engineering applications.     

Lap Shear Adhesion of Styrenic Triblock Copolymers to Polypropylene and Polystyrene

Shear mode adhesive strength of several styrenic triblock copolymers to Polypropylene (PP) and Polystyrene (PS) was examined as a function of midblock structure, styrene content, and molecular weight. A modified lap shear test was designed to allow adhesive strength measurement in strongly adhering adhesive joints where, in the conventional lap shear test, tensile failure in one of the adherends occurred before the adhesive strength was attained. To both substrates, the adhesive strength was highest for poly(ethylenebutylene) midblock (S-EB-S), followed by polyisobutylene midblock (S-IB-S), polybutadiene midblock (S-B-S), and finally polyisoprene midblock (S-I-S). For the S-IB-S copolymers, as the styrene content and molecular weight increased the adhesive strength increased to the PS substrate but remained nearly constant to the PP substrate. Lap shear adhesive strength was related to the nanoscale block copolymer morphology. Adhesive strength increased as the adhering phase of the triblock, styrene when bonding to PS and the rubber midblock when bonding to PP, became more continuous.