新型非离子型水性环氧固化剂的合成及性能研究

为提高水性环氧涂料的固化性能和适用期,以自制聚酰胺和生物基戊二胺为起始原料,聚乙二醇二缩水甘油醚（ PEGGE）为亲水链段,双酚 A型环氧树脂（ E-51）为疏水链段,邻甲苯缩水甘油醚（ CGE）为封端剂制备了非离子型低温水性环氧固化剂,并与自制水性环氧乳液复配制得双组分水性环氧涂料。考察了环氧固化剂合成工艺参数及涂膜各项性能。结果表明：该固化剂含有较长的柔性脂肪烃碳链和聚醚链段能够提高涂膜的柔韧性;双酚 A型环氧树脂参与扩链反应能够解决与乳液不兼容等问题;苯环结构增加了涂膜的硬度;涂膜室温固化后性能优异,具有良好的物理机械性能、耐水性、耐酸碱性和耐盐雾性。     

紫外光固化木器涂料性能研究——齐聚物对涂膜性能的影响

研究了环氧丙烯酸酯和聚氨酯丙烯酸酯系列齐聚物对紫外光固化木器涂料的性能影响。结果表明，齐聚物的结构和配比对涂膜的硬度、附着力、耐磨耗性等有显著影响，环氧丙烯酸酯和聚氨酯丙烯酸酯用量比例为30～40：70～60时，涂膜综合性能最佳。     

金属拉链用紫外光固化涂料的制备

采用丙烯酸树脂、改性环氧丙烯酸树脂、活性稀释剂、光引发剂、混合溶剂及各种助剂制备了一种金属拉链用紫外光固化涂料。研究了两种树脂用量对紫外光固化涂膜硬度、附着力、柔韧性、耐冲击性、拉伸性能、耐刮擦性、耐化学腐蚀性等的影响,最终确定了涂料配方。     

Z-95光固化涂料的研制

研制了一种紫外光固化环氧丙烯酸酯涂料，讨论了光强、引发剂、促进剂对涂料固化性能的影响。所得涂膜耐冲击强度高达４．９Ｎ·ｍ，附着力强，耐水、耐汽油。     

环氧树脂及其涂料

200902017环氧硅烷、其制备工艺和含环氧硅烷的可固化组合物;200902019由基于含羧基化合物、多环氧和潜固化催化剂的涂料组合物形成多层涂膜的方法;200902020具有良好柔韧性的涂料用环氧型聚合物组合物;200902021环氧和热塑性粉末热可喷涂涂料组合物;200902022流变剂对环氧树脂涂料性能的影响研究;     

水性环氧树脂涂料及其固化机理的研究

通过对环氧树脂室温固化剂三乙烯四胺进行封端、加成、成盐等一系列改性,制得自乳化水性环氧树脂固化剂;与低相对分子质量的液体环氧树脂混合后,获得了水性环氧树脂涂料。研究了不同封端剂对固化剂乳化性能的影响以及与环氧树脂配成涂料后对涂膜性能的影响,并通过对固化成膜过程的观察,阐述了水性环氧体系固化机理。获得的涂料乳液粒径小于2μm;涂膜硬度>0.7;附着力1级;涂膜具有良好的透明性、耐水性及耐化学药品性。     

水泥改性自乳化环氧-胺涂料的配方及防腐蚀性能研究

采用硅酸盐水泥改性自乳化环氧,然后用水性胺固化制备具有防腐蚀性能涂料。涂料涂覆在碳钢等金属表面后,水泥水合物与环氧-胺组成互穿网络结构的涂膜,并考察了不同水泥添加量改性环氧涂料涂膜的防腐蚀性能。结果表明:涂膜具有低的水渗透性,有效地保护金属表面腐蚀,水泥添加量为30%时,涂膜的物理性能和防腐蚀性能最佳,耐盐水和盐雾长达2 000 h。该材料在金属重防腐领域具有广泛的应用前景。     

固化剂用量对水性环氧涂料性能的影响

水性环氧涂料不仅具有良好的防腐性能,而且符合环保要求,可以用于工程机械涂装。由于水性环氧乳液是一个多相体系,其涂料的固化过程与溶剂型环氧涂料有所区别,特别是环氧固化剂的用量对涂膜的性能有较大影响。本文通过对不同比例的水性环氧乳液和固化剂进行研究,采用红外光谱、涂膜硬度、吸水率、耐中性盐雾试验以及电化学交流阻抗谱进行分析与表征,结果表明m(环氧乳液)∶m(固化剂)=4.5∶1时,涂料的综合性能最优。     

环氧树脂及其涂料

co01 032含有1,3,5一三嗓氨基甲酸醋及环氧化合物的可固化组合物:us5852133[关国专利]/美国:eytec Teehnology Co印·(Gupta,RamBaboo等)一1998.12.22一13页一705472(1996.8.29);IPC C08F8/32(525一375) 该可固化的组合物含有1,3,5一三嗓氨基甲酸醋交联剂阵口三(甲氧基丁氧基拨氨琴卜1,3,5-三啧扮11多官能度的环氧树脂,可用于涂料。另外,这种涂料还一可含有助交联剂和/或多官能羚荃的材料。相对于氨基树脂型涂料而言,这种涂料可降低甲醛的释放量,并月.不损坏涂膜的最终性能。0001 033含有石墨、氧化硅和橡胶填料的环氧防滑涂料[刊,英]/…     

环氧树脂及其涂料

高交联密度双组分环氧树脂涂料；液化天然气船舱内壁用含防腐颜料的多官能环氧树脂涂料组合物、其涂膜和涂覆的底材，及其防腐方法；Ⅱ型水性环氧树脂性能的试验研究；低温固化环氧多元醇树脂组合物；含环氧树脂组合物和胺固化剂的水可固化双组分环氧涂料组合物     

Computer simulation of structure and properties of crosslinked polymers: application to epoxy resins

In this work, a methodology has been developed for construction of atomistic models of crosslinked polymer networks. The methodology has been applied to low molecular weight water soluble epoxy resins crosslinked with different curing agents that are being considered for use as a primer coating on steel. The simulations allowed the crosslink density and the amount of free crosslinking sites in the coatings to be predicted. Shrinkage of the resin upon curing was reproduced by the simulation. In addition, the barrier properties of the model coatings were estimated. The interface between an inorganic substrate and cured epoxy resin has been constructed and the strength and molecular mechanisms of adhesion have been revealed. The developed methodology has a potential to significantly impact on the design and development of new coatings with improved barrier and adhesion properties.     

Novel isocyanate-free self-curable cathodically depositable epoxy coatings: Influence of epoxy groups on coating properties

Novel self-curable cathodically depositable coatings were developed from glycidyl functional epoxy ester-acrylic graft co-polymer (EEAG) without using any external crosslinking agents. The EEAG-amine adducts (EEAGAs) were prepared by reacting EEAG with varying amount of diethanolamine (DEoA) which are neutralized with acid and dispersed in deionised water to give stable dispersion for cathodic electrodeposition (CED) coatings. The dispersions were cathodically electrodeposited on phosphated steel panels and thermally cured to give uniform coating. The coatings were evaluated for different mechanical, chemical and corrosion resistance properties. The coatings were evaluated for their thermal properties using thermo gravimetric analysis (TGA). The final properties of the coatings were found to be affected by the amount of amine reacted with epoxy. The coating films showed good overall performance properties for their use in coating industry.     

An epoxy novolac emulsion system for ambient cure protective coatings

Conclusions  Water-borne two-pack coatings based on a novel low particle size epoxy novolac emulsion, crosslinked with polycycloaliphatic polyamine provide a good balance of several properties. Because the films cured possess a high crosslink density of cross linkage, expectations such as rapid through film drying time, high hardness development at an early stage during cure, very good film formation at 10°C and 80% R.H., and chemical resistance can be met. However, there are also adverse aspects to consider regarding the combination of a water-insoluble hydrophobic polyamine and a modified epoxy novolac emulsion. eg no visible end of pot life, relative short pot life and a brittleness of coatings associated with a tendency to peeling when exposed to salt spray and humid conditions. The study also revealed that the quality of a cured two-component epoxy binder emulsion system depends to a great extent on the quality of the emulsion, particularly on the size and distribution of the droplets. A low particle size epoxy emulsion improves the film formation, drying time, water resistance, gloss, adhesion and hardness. For this purpose epoxy emulsions with a narrow particle size distribution and relatively low particle size (mean value ca. 0.4 μm) can be developed using a proprietary mechanical emulsion process. The aqueous coating system described may be useful for applications where conventional epoxy novolacs are already used as low temperature heat cure coatings like drill pipe coatings, oil pipelines and fuel storage tanks and in fields where their chemical, water and solvent resistance can be utilised. Further ambient cure applications may be protective coatings for indoor use, eg food factories, schools, hospitals and office buildings, industrial maintenance coatings for concrete, mortar, bricks, plaster and wood.     

Waterborne acrylic-epoxy coatings

Waterborne two-component acrylic-epoxy coatings are gaining popularity as topcoats in moderate duty industrial and high performance architectural (HIPAC) applications. This increased popularity is due to their attractive handling, application, and performance properties, along with their low solvent content and odor. The objectives of this work were to characterize the cure and property development of these coatings, evaluate performance properties of cured films, and investigate a new epoxy resin dispersion in existing acrylic-epoxy formulations. These evaluations confirmed that existing acrylic-epoxy coatings have long pot life and short dry times while displaying a range of chemical resistance and physical properties. IR spectroscopy and differential scanning calorimetry (DSC) results indicated that the extent of cure at ambient conditions over a 21-day period was minimal; however, dynamic mechanical analysis (DMA) and solvent swell results did illustrate noticeable crosslink density development under these conditions. DSC results demonstrated more complete reaction and cure after heating. Direct substitution of a novel epoxy resin dispersion into these formulas resulted in lower required solvent content, shorter dry time, higher gloss, higher crosslink density, and improved water and scrub resistance. Presented at the 79th Annual Meeting of the Federation of Societies for Coatings Technology, on November 5–7, 2001, in Atlanta GA. 7201 Hamilton Blvd., MailStop R3108, Allentown, PA 18195-1501.     

Effect of curing agent on the properties of mineral silica filled epoxy composites

Polymer materials have been used extensively as the organic substrate materials in electronic packaging industry. The mechanical, thermal, and morphology properties of the alternative low cost composites have been investigated in this article. One of the materials is epoxy resin cured by aliphatic amine, and the other is cured by aromatic amine. It was found that the physical, mechanical, and thermal properties of epoxy resins are strongly depended on the curing agents. Morphology changed differently in these two epoxy‐curing systems. Crosslink density obtained from rubbery modulus in dynamic flexural storage modulus showed aromatic amine functionality group that gives higher crosslink density and increased in physical, mechanical, and thermal properties. POLYM. COMPOS., 29:27–36, 2008. © 2007 Society of Plastics Engineers     

环氧改性氰酸酯树脂的研究

综述采用环氧树脂增韧改性氰酸酯树脂的共聚反应机理、固化催化体系，以及环氧树脂／氰酸酯树脂固化体系的性能和复合材料的性能。环氧树脂与氰酸酯树脂反应生成恶唑啉酮五元环，降低了氰酸酯树脂的交联密度，使韧性提高；催化剂可以明显提高共聚反应速度，改变产物含量；改性后的氰酸酯树脂具有优良的综合力学性能和成型工艺性，且介电性能及耐热／湿热性能无较大损失。     

Effect of stoichiometry and cure prescription on fluid ingress in epoxy networks

Stoichiometry and cure temperature were evaluated for epoxy systems based on the diglycidyl ethers of bisphenol‐A and bisphenol‐F and cured with 3,3′‐ or 4,4′‐diaminodiphenylsulfone. The materials were formulated as stoichiometric benchmarks and with an excess of epoxide and cured in two steps (125°C/200°C) or one step (180°C). Dynamic mechanical analysis and free volume testing indicated decreased crosslink density and increased chain packing in the excess‐epoxy materials, as well as a narrowing gap in properties between 33‐ and 44‐cured networks with excess epoxy. The narrowing gap was less pronounced in materials cured at 180°C. The excess‐epoxy materials were more resistant to water ingress, exhibiting reduced equilibrium water uptake. The excess‐epoxy materials were also more resistant to methyl ethyl ketone ingress, which occurred at a slower rate in most excess‐epoxy materials. The improvement in fluid resistance was attributed to enhanced chain packing in the materials with lower crosslink densities. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

Reversible crosslinking in epoxy resins. I. Feasibility studies

The objective of the research is to investigate epoxy resins where crosslinks formed in curing reactions can be cleaved and reformed without significant sacrifice in resin properties. In this phase of the investigation, experimental disulfide-containing crosslinking agents have been studied, including dihydrazides of dithiodicarboxylic acids(aliphatic and aromatic) and dithio-aromatic diamines. Conditions for curing reactions and for subsequent cleavage of crosslinks by reduction have been determined in model systems and confirmed for a prototype epoxy resin. A preliminary comparative evaluation of cure kinetics and of crosslink density and thermal and mechanical properties has been carried out for this resin cured with aromatic curing agents (4,4′-dithiodianiline and methylene dianiline) and with aliphatic compounds (3,3′-dithiopropionic acid dihydrazide and hexamethylene diamine). It has been shown that in a resin fully cured with disulfide-containing crosslinking agents, crosslinks could be ruptured by reduction, and reestablished by oxidation under mild conditions.     

低温固化阴极电泳涂料的制备及研究

以乙二醇单丁醚和乙二醇单乙醚为封闭剂,全封闭的甲苯二异氰酸酯为交联剂制得了一种阳离子型环氧树脂,同时对环氧树脂阴极电泳涂料性能进行了研究,并系统的探讨了电泳涂料的配方和工艺对涂膜的影响。结果表明,最佳封闭温度为50℃,接枝温度为80℃时1,50℃烘烤30 min得到外观平整光滑、附着力强、耐水性强的无色透明漆膜。