耐温有机胶粘剂的发展现状

综述了国内外有机耐热胶粘剂的发展现状,介绍了当前提高耐温胶粘剂高温性能的一些主要途径和改性方法,以及纳微米材料在有机树脂中的应用情况。     

环氧树脂胶粘剂的耐热改性研究进展

介绍和评述了环氧树脂胶粘剂耐热和增韧改性的若干体系,如高官能度环氧、环氧-酚醛、环氧-丁腈、环氧-芳胺、环氧-芳胺-双亚胺、环氧-链烯基酚-双亚胺、环氧-双羟、羧亚胺、环氧-聚酰亚胺和环氧-氰酸酯等的研究和应用情况。     

New heat-resistant polytriazole adhesives: investigation of adhesion of polytriazole resins to metals

Crosslinkable polytriazole resins (CPTs) were synthesized by 1,3-dipolar cycloaddition reaction between azide and alkyne monomers. Adhesion properties of CPTs and an epoxy resin to different metal substrates (copper, iron and aluminium) were evaluated in terms of the tensile lap shear strength. CPTs to aluminium and iron substrates have higher adhesion strength than those to copper substrates. The effect of temperature and humidity on adhesion strength has been investigated. The resin CPT-3 has the best heat resistance among CPTs, whose retentions of adhesion strength are approximate 80% at 150?°C and 70% at 180?°C to all the substrates. CPTs have high adhesion properties at high temperature and humidity as compared with an epoxy resin.     

DDM/EP/CTBN增韧BMI耐高温胶合成工艺研究

以N,N-′4,4′-二氨基二苯甲烷型双马来酰亚胺(BM I)、环氧树脂(EP)、4,4′-二氨基二苯甲烷(DDM)为主要原料,合成了2种以BM I为基体的耐高温胶粘剂,分析了DDM、EP用量对胶粘剂性能的影响。采用差示扫描量热、红外光谱、热重分析表征了产物的反应程度、结构和热稳定性。结果表明,2种工艺都采用mBM I∶mEP∶mDDM=1∶1∶0.85时综合性能最优,在相同的固化条件下,共熔型体系耐高温实验强度(30.07 MPa)优于预聚型体系(27.33 MPa),但耐温冲击实验强度(29.83 MPa)不如后者(31.58 MPa)。     

大豆基生物质胶粘剂研究进展

随着人们环保意识的增强,开发研究木材加工用环保型胶粘剂已越来越受到重视。介绍了一种环境友好型胶粘剂(大豆基木材胶粘剂)近年来在国内外的研究概况,提出了该胶粘剂今后的发展方向,为大豆基生物质木材胶粘剂的后续研究和应用创造了一定的理论条件和经验基础。     

丙烯酸酯类乳液胶粘剂的研究进展

综述了丙烯酸酯类乳液胶粘剂的合成、改性、应用等方面的研究进展。在合成方面,讨论了主要组分的作用及影响因素,在性能方面阐述了改性的方法,并简述了丙烯酸酯乳液胶粘剂的用途。     

Contribution of biological research to the development of the coconut industry

Current developments in coconut breeding, embryo and tissue culture, and the studies on the etiology of cadang-cadang disease are discussed. The present state of the art for each of these with specific reference to the Philippine situation is presented.     

Preparation,structural evolution,and performance of heat-resistant organosilicon polymer adhesives for joining SiC ceramics

There is an urgent need for heat-resistant adhesives with high bonding strength in order to able to fabricate large and complex SiC components for aeronautical and astronautical applications. In this study, heat-resistant organic adhesives prepared using an organosilicon polymer and inorganic additives (B₄C and SiO₂) were used successfully to bond SiC ceramics. The prepared adhesives were characterised through shear strength tests as well as using thermogravimetry-differential scanning calorimetry, Fourier-transform infrared spectroscopy, X-diffraction analysis, and scanning electron microscopy. The adhesives exhibited high room-temperature shear strengths (greater than 15 MPa) after being subjected to heat treatments at 200–1200°C. Further, the high-temperature shear strengths of the adhesives at 200, 400, 600, 800, and 1000°C were 10.5, 10.1, 7.7, 8.6, and 8.4 MPa, respectively. The high performance of the adhesives indicated that they should be suitable for joining SiC-based materials for use in high-temperature applications.     

VAE乳液胶粘剂的应用发展

简单介绍了VAE(醋酸乙烯-乙烯共聚物)的种类以及国内VAE乳液胶粘剂的品种,重点探讨了VAE乳液胶粘剂的传统工艺流程以及改进工艺流程。总结了共混、共聚、交联和转向乳化改性VAE乳液胶粘剂的优缺点及其应用范围。最后展望了国内VAE乳液胶粘剂的发展方向。     

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。     

木材用胶粘剂的现状和发展趋势

主要介绍了我国脲醛树脂、酚醛树脂、三聚氰胺甲醛树脂、聚氨酯、热塑性树脂、聚醋酸乙烯酯、热熔胶、木质素、单宁、生物胶等木材用胶粘剂的现状和发展趋势。     

氯丁胶的研究现状与发展趋势

综述了溶剂型氯丁胶和水性氯丁胶的研究进展,并对两者的优缺点和存在的问题进行了对比和分析。最后对环保型水性氯丁胶的发展方向进行了展望。     

三聚氰胺改性脲醛树脂胶粘剂的研究进展

三聚氰胺改性脲醛树脂胶粘剂具有比脲醛树脂胶粘剂更好的耐水性、耐热性及稳定性,井能减少游离甲醛的含量,已成为木材加工业的重要用胶。本文主要从发展概况、合成机理、合成工艺和应用等几个方面,介绍了三聚氰胺脲醛树脂胶粘剂的研究进展,并对其发展前景进行了展望。     

淀粉胶粘剂的研究及发展趋势

介绍了淀粉胶粘剂的种类及形成机理,并对淀粉胶粘剂的应用局限性、发展现状及发展趋势作了简要综述。     

The development of heat-resistant and salt-tolerant foam with betaine surfactants

A modified instrument was designed to evaluate foam properties under high temperature and pressure. The type and molar ratio of betaine surfactants were screened to develop the heat-resistant and salt-tolerant foam for Tahe oilfield (130°C, 220 g/L), and the effects of temperature and pressure on foam properties were also investigated. The synergism between surfactants and the enhanced oil recovery (EOR) mechanism of foam flooding in fractured-vuggy reservoirs were studied. Experimental results showed the developed foam had excellent foaming ability and foam stability when the lauramidopropyl hydroxyl sulfobetaine (LHSB): erucic amide propyl betaine (EAB) molar ratio ranged from 1:1 to 1:2 (initial foam volume was 392 ml when the molar ratio was 1:1, drainage half-time was 5.75 min and foam half-time was 72 min when the molar ratio was 1:2 at 130°C and 2 MPa). The synergistic effect was found to reach its maximum when the LHSB:EAB molar ratio ranged from 1:1 to 1:2 according to interaction parameters, which agreed with the results of foam properties. Foam stability was found to considerably increase with increasing pressure, but decrease with increasing temperature. However, temperature and pressure were found to have consistent effects on foaming ability, that is, the foaming ability increased with increasing temperature and pressure. The flooding test showed foam flooding exhibited better sweep efficiency and higher recovery ratio in the fractured-vuggy model than gas flooding and water flooding. This could be because injected foam did not channel through the top (or bottom) path due to its high viscosity and moderate density.     

口腔胶粘剂的现状与未来

介绍了口腔用生物胶粘剂的研究现状,提出了口腔用胶粘剂的技术要求与目前存在的问题及对策.重点介绍了贻贝海洋生物粘接蛋白(BP)的基础研究及其应用前景,对其主要成分与作用进行了综述.应用基因重组技术是目前制备BP最有效、最经济的方法,可以解决天然胶难保存、获取量小的缺点,为未来生物胶粘剂的制备奠定技术基础.深信基因重组等新技术制备的仿生物胶粘荆,不久将有可能应用于医学与口腔临床.     

水基型汽车内饰胶粘剂的研究进展

介绍了2类最常用的水基型汽车内饰胶粘剂如水基聚氨酯胶粘剂、水基丙烯酸酯胶粘剂在汽车内部装饰上的应用现状及各自的研究进展,展望了水基型汽车内饰胶的发展前景。     

UV固化型高性能压敏胶的发展动态

UV固化型压敏胶作为一种新型光固化压敏胶,无溶剂、无污染、能耗低,既克服了热熔压敏胶容易热氧老化和不耐高温的缺点,与乳液型压敏胶相比,又提高了耐水性和涂布速度,成为压敏胶领域研究的热点。本文综述了近10年来国内外UV固化型压敏胶的发展状况,对不同种类的UV固化型压敏胶的性能特点和制备方法做了归纳,重点阐述了丙烯酸酯类UV固化压敏胶的最新进展。总结了UV固化型压敏胶需要解决的问题并对未来发展方向作了展望。     

木材胶粘剂的研究现状和发展趋势

本文综述了木材胶粘剂的国内外现状；论述了各种木材胶的结构及作用机理，结合各胶种的优缺点介绍了其应用情况，重点讨论了水性聚氨酯胶粘剂作为木材胶的特点及优势：指出了我国木材加工领域用胶存在的问题和发展趋势。