聚酰胺与腰果酚改性胺环氧固化剂的耐黄变性能比较

E-20环氧树脂分别与聚酰胺树脂和腰果酚改性酚醛胺固化,将漆膜曝晒,检测色差;用紫外线照射,检测漆膜性能。发现腰果酚改性酚醛胺比聚酰胺使环氧漆膜变黄的速率要快,紫外线对前者颜色影响更大,因而聚酰胺适合于作环氧面漆固化剂,腰果酚改性酚醛胺适合于作环氧底漆固化剂。     

腰果酚改性环氧树脂固化剂的研究进展

介绍了国内外腰果酚改性环氧树脂固化剂的研究现状,包括腰果酚改性环氧固化剂的合成、表征、固化物的固化速率及硬度、韧性、固化物的力学性能和其他性能,并指出了腰果酚改性环氧树脂固化剂的发展方向。     

酚醛环氧防腐涂料用固化体系研究进展

综述了近年来国内外酚醛环氧防腐涂料用固化体系的研究现状和进展,包括苯酚-甲醛、双酚A-甲醛树脂和腰果酚-苯酚-甲醛树脂等酚醛树脂固化体系,苯酚-甲醛、双酚A-甲醛改性胺和腰果酚缩醛胺固化体系及其他固化体系。认为腰果酚改性胺固化剂是一种性能优异的环氧树脂固化剂,它对开发新型高性能、多用途、低成本和环保型的重防腐环氧树脂涂料固化技术提供了新思路。     

聚酰胺及腰果酚改性胺环氧固化剂的研究进展

综述了聚酰胺及腰果酚改性胺环氧固化剂的制备、固化过程及性能研究进展,介绍了2种新型固化剂腰果酚改性聚酰胺和腰果酚酰胺。     

新型腰果酚环状碳酸酯型固化剂的制备与性能

以腰果酚环氧化合物和CO2为原料合成了腰果酚环状碳酸酯,再进一步与三乙烯四胺反应,制备了一种腰果酚环状碳酸酯型固化剂(CAC),采用FT-IR对产物结构进行了表征。通过示差扫描量热仪,热重分析和力学性能测试对比研究了其与常用的腰果酚酚醛胺固化剂固化双酚A型环氧树脂体系的固化行为及固化物的热稳定性和力学性能。结果表明,腰果酚环状碳酸酯型固化剂的反应活性低于腰果酚酚醛胺固化剂,但固化物的韧性要好于后者。     

腰果酚改性胺-环氧树脂室温固化性能的研究

为了实现固化剂的内增韧,采用腰果酚、苯酚、甲醛和三乙烯四胺为原料,利用傅克烷基化反应和曼尼希反应制备了腰果酚-苯酚混酚改性胺固化剂。主要研究了固化剂与环氧树脂的室温固化工艺性能,室温固化物的固化度、粘接性能和综合力学性能(压缩性能、冲击性能、拉伸性能、硬度等)。结果表明,制备的腰果酚-苯酚混酚酚醛胺固化剂具有优良的冲击韧性、较长的适用期、室温快速固化能力、较高的力学性能和胶接性能优点,是一种综合性能较佳的环氧固化剂,有很好的应用前景。     

腰果油改性聚酰胺固化剂在环氧富锌涂料中的应用

通过对传统聚酰胺、腰果油改性聚酰胺和酚醛胺等固化剂的性能对比,测试了腰果油改性聚酰胺低温固化的特点,并通过在环氧富锌涂料中的应用,发现以腰果油改性的聚酰胺固化剂固化的环氧富锌漆膜和传统聚酰胺固化剂固化的环氧富锌漆膜具有相近的物理机械性能,但耐盐雾性能可达到2000h,显著提高了环氧富锌涂料的防腐性能,是一种综合性能优异的环氧树脂固化剂。     

促进剂对低温固化剂-环氧树脂体系性能的影响

分别选用二乙烯三胺和间二甲苯二胺与甲醛、腰果酚按照不同比例反应制得13种改性胺环氧低温固化剂,通过剪切强度,反应活化能和固化度测定以及红外光谱分析研究了不同促进剂DMP-30用量对环氧树脂及上述胺体系的物理性能、固化过程及固化产物性能的影响。结果表明:DMP-30与环氧树脂/胺体系具有一定的匹配性,促进剂具有正负效应。对于环氧和改性胺反应配比n(腰果酚)∶n(间二甲苯二胺)∶n(醛)=1.0∶1.0∶1.0的体系而言,促进剂的最佳添加质量分数为2%。     

腰果酚曼尼希改性胺-环氧树脂热固化性能的研究

为了得到一种具有内增韧的同时也能具有良好的耐热性的固化剂,制备了腰果酚酚醛胺、腰果酚-苯酚混酚酚醛胺、苯酚酚醛胺3种固化剂。主要研究了固化剂与环氧树脂加热固化物的固化度、粘接性能和综合力学性能(压缩性能、冲击性能、拉伸性能等)。结果表明,制备的腰果酚-苯酚混酚酚醛胺固化剂保留了腰果酚醛胺固化剂优良的冲击韧性、较长的适用期等优点,同时也保留了苯酚酚醛胺固化剂较高的力学性能和胶接性能,是一种综合性能较佳的环氧固化剂。     

桥梁加固用腰果酚改性胺类低温固化剂分子的空间位阻效应研究

以腰果酚、多聚甲醛和3种不同分子链长度的多胺(二乙烯三胺、三乙烯四胺和四乙烯五胺)等为原料,通过曼尼希反应合成了3种桥梁加固用空间位阻不同的腰果酚改性胺类低温固化剂。采用傅里叶红外光谱对其进行了表征,同时分析了胺值,研究了其对环氧树脂(E-51)胶粘剂低温固化性能的影响。结果表明,随着胺类固化剂空间位阻的减小,固化剂胺值逐渐减小,黏稠度增加,其固化的E-51胶粘剂低温固化物的弯曲强度、拉伸强度、压缩强度和钢-钢拉伸剪切强度逐渐增大,断裂伸长率逐渐减小,但受拉弹性模量变化趋势不明显,从分子结构水平研究了腰果酚改性低温固化剂性能及固化物性能的影响。揭示了腰果酚改性胺类低温固化剂空间位阻效应与固化性能之间存在的内在联系及基本规律,从而对腰果酚改性胺类固化剂的研究提供了理论依据。     

快速固化型环氧树脂灌浆材料的制备及性能

利用腰果酚、多聚甲醛、二乙烯三胺曼尼西反应合成的酚醛胺与聚丙二醇二缩水甘油醚反应制备了环氧树脂固化剂，与环氧树脂E?51、F?51、稀释剂692制备了双组分环氧树脂灌浆材料。研究了固化剂的合成工艺以及环氧树脂灌浆材料的固化行为和固结体的性能。结果表明，合成固化剂的最佳投料比为n(醛)∶n(酚)∶n(胺)∶n(醚)= 1∶1.1∶1.2∶0.4，固化剂组分与环氧树脂组分的体积比为100∶（80~120）时，浆液的初始黏度为400~500 mPa·s，凝胶时间为25~45 min，固结体性能都符合JC/T 1041-2007的要求；在浆液发生凝胶前，浆液黏度先随着时间逐渐降低后快速上升，凝胶时间随着使用温度的降低逐渐增加。     

防腐性能优异的新型环氧树脂固化剂——腰果酚改性聚酰胺

分析了环氧树脂涂料用固化剂的现状,指出了其存在的问题。在此基础上开发了一种新型的腰果酚改性酰胺树脂,从而解决了聚酰胺树脂低温无法固化和改性胺树脂的柔韧性差、易黄变等问题,是一种具有优异防腐性能、能四季常温固化的高性能环氧树脂固化剂。     

常温固化环氧改性有机硅耐高温涂料的研制

用环氧树脂E-20和有机硅低聚物（PS）合成了一种环氧树脂改性有机硅树脂,采用红外光谱（IR）、热失重分析（TGA）等方法对产物进行了表征和分析。探讨了有机硅含量对涂料耐热性能的影响,优选了综合性能优良的固化剂和颜填料制得了耐高温涂料,同时对涂膜性能进行了测试。结果表明,当m（E-20）：m（PS）=2：8时,改性有机硅树脂的综合性能得到了明显改善。采用改性芳香胺固化剂,硅烷偶联剂KH550以及适当的颜填料制备的涂料具有良好的耐热防腐性能,可常温固化,能在500℃环境下长期使用。     

水性环氧固化剂分散体的制备及改性

采用不同分子量的聚乙二醇与液体环氧树脂EPON828合成反应型乳化剂,然后将反应型乳化剂链段引入到以液体环氧树脂EPON828与间苯二甲胺为原料合成的端胺基中间体的分子结构中,再用活性稀释剂进行封端,最后加水分散,制得水性环氧固化剂分散体。采用了γ-氨丙基三乙氧基硅烷(即硅烷偶联剂KH-550)对其进行改性。确定了间苯二甲胺与环氧树脂EPON828的摩尔比为2.2∶1,聚乙二醇6000与环氧树脂EPON828(摩尔比为1∶1)制备的反应型乳化剂用量为9%,硅烷偶联剂KH-550的用量为固化剂分散体的质量的2%时,所制备的水性环氧固化剂分散体稳定性最佳,其粒径为750.8nm,固含量约60%,胺值为118mgKOH/g,黏度为4500mPa·s。室温固化后,涂膜硬度为3H,光泽度(60°)为108%,冲击强度50kg·cm,柔韧性1mm,附着力1级,耐酸碱腐蚀性能好。通过傅立叶变换红外光谱表征了反应产物。     

室温固化改性芳胺固化剂的研制

研究了改性芳香胺环氧树脂室温固化剂。通过甲醛与苯胺缩合所生成的缩聚多元伯胺能获得良好的固化性能。着重研究了胺醛物质的量比、催化剂对缩合物的影响。     

Room Temperature Curing Epoxy Adhesives for Elevated Temperature Service,Part II: Composition,Properties, Microstructure Relationships

Low temperature curing epoxy formulations for elevated temperature service have been previously developed and studied (Part I¹). Balanced performance with respect to shear and peel properties have been obtained for a system composed of a tetra and trifunctional epoxy blend crosslinked by a mixture of multifunctional amine and an amino-terminated elastomer. In continuation of the previous study, the present one is aimed at investigation the effect of substitution of difunctional epoxy resin and curing agent for trifunctional ones on the developing microstructure and resulting mechanical properties. Furthermore, a new type of amino-terminated-acrylonitrile (ATBN) and an epoxy-terminated silane were included in the present investigation. Experimental results show that while reduction in the overall functionality of the reactants results in a lower lap shear strength, it gives rise to enhancement in peel strength. The same effect was observed when the new ATBN was used. Thermal analysis of the polymerization processes, taking place during curing of the various low temperature curing formulations, indicates that the curing activation energies are appreciably lower compared with high temperature curing systems. Addition of silane, ATBN and substitution of the multifunctional amine curing agent by a lower functional one, resulted in a moderate increase in the activation energy. The basic formulation, comprising a tetra- and trifunctional resin blend and a multifunctional amine and ATBN crosslinking mixture, developed a typical two-phase matrix-rubber microstructure. A third phase was observed when the trifunctional epoxy resin or the multifunctional curing agent was substituted by lower functional ones. A similar three-phase morphology was obtained when the epoxy-terminated silane was added to the basic treta- and trifunctional reactant system.     

Room Temperature Curing Epoxy Adhesives for Elevated Temperature Service, Part II: Composition, Properties, Microstructure Relationships

Low temperature curing epoxy formulations for elevated temperature service have been previously developed and studied (Part I¹). Balanced performance with respect to shear and peel properties have been obtained for a system composed of a tetra and trifunctional epoxy blend crosslinked by a mixture of multifunctional amine and an amino-terminated elastomer. In continuation of the previous study, the present one is aimed at investigation the effect of substitution of difunctional epoxy resin and curing agent for trifunctional ones on the developing microstructure and resulting mechanical properties. Furthermore, a new type of amino-terminated-acrylonitrile (ATBN) and an epoxy-terminated silane were included in the present investigation. Experimental results show that while reduction in the overall functionality of the reactants results in a lower lap shear strength, it gives rise to enhancement in peel strength. The same effect was observed when the new ATBN was used. Thermal analysis of the polymerization processes, taking place during curing of the various low temperature curing formulations, indicates that the curing activation energies are appreciably lower compared with high temperature curing systems. Addition of silane, ATBN and substitution of the multifunctional amine curing agent by a lower functional one, resulted in a moderate increase in the activation energy. The basic formulation, comprising a tetra- and trifunctional resin blend and a multifunctional amine and ATBN crosslinking mixture, developed a typical two-phase matrix-rubber microstructure. A third phase was observed when the trifunctional epoxy resin or the multifunctional curing agent was substituted by lower functional ones. A similar three-phase morphology was obtained when the epoxy-terminated silane was added to the basic treta- and trifunctional reactant system.     

腰果酚缩醛胺固化剂的性能研究

以腰果酚、甲醛和二乙烯三胺为原料经缩聚反应合成了腰果酚缩醛胺(PCD)固化剂,采用红外光谱对产物结构进行了表征。与目前国内几种常见的环氧树脂固化剂对比研究了其与环氧树脂的相容性、固化物的物理力学性能、耐化学介质性及对不理想表面的附着力。实验结果表明,PCD固化剂具有良好的综合性能。     

Preparation and anticorrosive performances of polysiloxane-modified epoxy coatings based on polyaminopropylmethylsiloxane-containing amine curing agent

In this article, polysiloxane-modified epoxy coatings were prepared using the mixture (CPSA) of polyaminopropylmethylsiloxane (PAPMS) oligomer/N-(2-hydroxyethyl)ethylenediamine as a curing agent and cardanol as a compatibilizer. The PAPMS oligomer was prepared from the controlled hydrolysis and condensation of (γ-aminopropyl)methyldimethoxysilane. Conventional epoxy coatings based on commercial phenalkamine epoxy curing agent (PECA) were also fabricated for comparison. The compatibility between the CPSA amine curing agent and epoxy resin was investigated by SEM and element-mapping measurements. The anticorrosive performances of the CPSA- or PECA-based epoxy coatings were thoroughly examined by electrochemical impedance spectroscopy (EIS), salt fog tests, and immersion experiments in acid (25 wt% H₂SO₄), alkali (25 wt% NaOH), and saline (3 wt% NaCl). It was found that cardanol can dramatically improve the miscibility of CPSA with epoxy resins. Polysiloxane-modified (namely, CPSA-based) epoxy coatings have much better corrosion resistance than conventional (namely, PECA-based) epoxy coatings.