环氧-聚酰胺体系中增韧剂的研究

在环氧-聚酰胺体系中分别加入“海岛结构”QS-1、聚硫橡胶、液体丁腈橡胶增韧改性,通过对固化物剪切强度、弯曲弹性模量及断裂强度的对比,“海岛结构”QS-1增韧综合性能较好.     

一种高弹性改性环氧道路修补胶的研制

通过添加合适的增韧剂对双酚A环氧树脂进行改性,得到改性环氧树脂;同时筛选合适的韧性固化剂,固化得到高弹性道路修补胶。     

环氧树脂混凝土现状与分析

环氧树脂混凝土是指以环氧树脂为主料,掺入适量的固化剂、增塑剂、稀释剂及填料作为胶粘剂;以砂、石作为骨料,经混合、成型、固化而成的一种复合材料,是聚合物混凝土的一种．环氧树脂混凝土具有强度高、韧性好、抗冲击强度大、良好的耐化学腐蚀、耐磨、耐水和抗冻性能．固化后的环氧树脂混凝土对大气、潮湿、化学介质、细菌等都有很强的抵抗力．因此,较多在较为恶劣的环境中应用,具有良好的应用价值．但由于技术、造价等诸多因素的限制,环氧树脂混凝土应用数量和范围相当有限,并且,目前环氧树脂混凝土的韧性问题仍有待解决,因此笔者在对其应用现状进行分析的同时,提出通过加入纤维、增韧剂等对其韧性等问题进行分析与探讨．     

建筑结构胶粘剂的研究和应用

本文选择合适的试验方法和条件探讨对建筑结构胶性能有影响的几种因素，分析这些因素对胶粘剂性能所起的作用并进行改性工作，以提高建筑结构胶粘剂的综合性能．经过一系列的的试验和试点工程应用，获得一种无毒、无味，且在室温、低温、潮湿状态下均能固化，物理力学性能优良的新型建筑结构加固胶．     

Synthesis and characterization of a hyperbranched polyol with long flexible chains and its application in cationic UV curing

A hyperbranched polyol with long flexible chains on the molecule surface was synthesized and characterized. The effect of the hyperbranched polyol as flexibilizer and chain‐transfer agent on cationic UV curing was investigated. It was found the hyperbranched polyol could markedly improve the mechanical properties of cured film. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 1353–1356, 2000     

Amine-terminated polysulfone as modifier for epoxy resin

The synthesis of carboxyl-terminated poly(ethylene glycol adipate) (CTPA) and amine-terminated poly(amide sulfone) (ATPS) based on the CTPA and 4,4′-diaminodiphenyl sulfone (DDS) is described. The products were characterized by IR and ¹³C-NMR spectroscopic analysis, nonaqueous titration, viscosity measurement, and solubility characteristics. The developed ATPS was incorporated as a modifier into the epoxy matrix and its effect was studied by DSC and DMTA. It was found that ATPS forms a compatible blend with epoxy and imparts flexibility to the epoxy matrix. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65:901–907, 1997     

道桥用环氧树脂改性沥青材料的配方研究

以石油沥青和环氧树脂为主要原料制备了道桥用环氧树脂改性沥青材料,主要研究了配方中增容剂、固化剂、增韧剂的选择和配比以及环氧树脂的掺量对于环氧沥青材料性能的影响,并对实验结果进行了分析讨论。     

GNJ型建筑结构胶粘剂的开发

简要介绍了固化剂的选择、不同增韧剂的优劣及活性填料等材料对胶粘剂力学性能的影响。确定了以改性脂环族多胺与聚酰胺复配、加入奇士增韧剂和活性S iO2填料及其他助剂组成的GNJ型建筑结构胶粘剂配方,其钢-钢剪切强度达26.38 MPa,钢-钢拉伸强度达43.39 MPa。     

Mechanical and anticorrosive properties of non toxic coal-tar epoxy alternative coating

Coal tar epoxy (CTE) coating system has been widely used for protection of steel structures under atmospheric, buried and immersion conditions because of their low water vapour permeability, high electrolyte resistance and good antibacterial properties. However, coal tar has been classified as carcinogen, mutagen and toxic for reproduction (CMR) as per International guideline (REACH, IARC and GS 11). It is now banned in the developed nations like US, Europe, Japan, etc. As the use of coal tar is being restricted, there is an urgent need to formulate a coal tar free epoxy product for corrosion protection of structures. In the present study, alternative approaches have been proposed to replace coal tar such as bitumen (BIT), hydrocarbon resin (HR), flexibilizer (FL) and curing agents like polyamide (PAD) or polyamine (PAM). Four different coal tar free formulations were formulated separately by using these approaches. The standard CTE and coal tar free epoxy compositions were evaluated for mechanical properties such as elongation at break, tensile strength, adhesion strength and resistance to abrasion, impact and flexibility. The resistance to corrosion of optimized composition (epoxy-HR-FL-PAD-PAM) and coal tar epoxy coating was evaluated by exposing to different environments. The corrosion resistance property was also evaluated by cathodic disbondment and electrochemical impedance spectroscopy (EIS) technique. Results indicate that epoxy-hydrocarbon resin-flexibilizer composition cured with blend of polyamide and polyamine has comparable mechanical and corrosion protection properties to that of standard CTE.     

Preparation and analysis of a flexible curing agent for epoxy resin

A kind of novel aromatic amine bis(4‐nonyl‐2,5‐diamine‐penoxyl)alkylate (RA_n) as curing agents for epoxy resins were prepared through three steps of reactions using nonyl phenol and dibromoalkylate as materials. Dynamic mechanical analysis (DMA) indicated that the secondary relaxation for the resins cured by RA_n were generated by the nonyls in RA_n molecules when temperature was below ?50°C. Comparing with other reference resins, the enhancement for toughness of RA_n cured‐resins were at least 15%, which were contributed by such secondary relaxation. Furthermore, stiffness of the networks and thermal properties of the resins were not influent by the flexible groups (nonyl) in RA_n after curing, since the groups were located only in the branched chains of the networks. The mechanical and thermal properties of the new material have been significantly enhanced. The relevant method and procedure developed through this research have been granted Chinese patent recently (Yang and Gong, Chin. Pat. CN1978483A, 2007). © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009