STUDY ON HYDROLYSIS RESISTANT POLYCARBONATE POLYURETHANE EPOXY RESIN BLENDS

This paper studies the structure and properties of the polycarbonate polyurethane epoxy resin (PCPU EP) blends being resistant to hydrolysis.The samples were analyzed by an infrared spectrometer,a differential scanning calorimeter,a scanning electron microscope and a dynamic viscoelastometer.The results show that PCPU EP blends have excellent resistance to hydrolysis and mechanical properties at the ratio of PCPU to EP equal to 10/100 (wt/wt).

Curing mechanism of TDE-85/MeTHPA epoxy resin modified by polyurethane

Diglycidyl 4,5-epoxy tetrahydro phthalate/methyl tetrahydrophthalic anhydride （TDE-85/MeTHPA） epoxy resin modified by polyurethane （PU） was prepared with 1,4-butanediol （1,4-BDO）, trimethylol propane （TMP） and polyurethane prepolymer synthesized by polypropylene glycol and toluene diisocynate. Chemical reaction and curing mechanism of this system were discussed by incorporating the results of infra spectrum analysis. The results indicate that the epoxy polymeric network I is obtained by the curing reaction between TDE-85 and MeTHPA, while the PU polymeric network II is obtained by the chain-extended and crosslinking reaction between 1,4-BDO, TMP and polyurethane prepolymer（PUP）. The graft chemical bonds are formed between polymer networks I and II that therefore increase the degree of blend and compatibility between epoxy polymer and PU.

Structural characteristics and properties of polyurethane modified TDE-85/MeTHPA epoxy resin with interpenetrating polymer networks

Diglycidyl-4,5-epoxycyclohexane-1,2-dicarboxylate(TDE-85)/methyl tetrahydrophthalic anhydride (MeTHPA) epoxy resin was modified with polyurethane(PU) and the interpenetrating polymer networks(IPNs) of PU-modified TDE-85/MeTHPA resin were prepared. The structural characteristics and properties of PU-modified TDE-85/MeTHPA resin were investigated by Fourier transform infrared(FTIR) spectrum,emission scanning electron microscopy(SEM) and thermogravimetry(TG). The results indicate that epoxy polymer network (Ⅰ) and polyurethane polymer network (Ⅱ) of the modified resin can be obtained and the networks (Ⅰ) and (Ⅱ) interpenetrate and tangle highly each other at the phase interface. The micro morphology presents heterogeneous structure. The integrative properties of PU-modified TDE-85/MeTHPA epoxy resin are improved obviously. The PU-modified TDE-85/ MeTHPA resin's tensile strength reaches 69.39 MPa,the impact strength reaches 23.56 kJ/m,the temperature for the system to lose 1% mass (t1%) is 300 ℃,and that for the system to lose 50% mass (t50%) is 378 ℃. Compared with those of TDE-85/MeTHPA resin,the tensile strength,impact strength,t1% and t50% of the PU-modified resin increases by 48%,115%,30 ℃,11 ℃,respectively. The PU-modified TDE-85/MeTHPA resin has the structure characteristics and properties of interpenetrating polymer networks.

DynamicMechanical and Chemorheology Analysis for the Blended Epoxy System with Polyurethane Modified Resin

As the important matrix material,epoxy resin has been widely used in the composites for various fields.On account of the poor toughness of epoxy resin limiting their suitability for advanced applications,considerable interests have been conducted to modify the epoxy resin to meet the engineering requirements.In this study,the bio-based polyurethane(PU)modified resin was adopted to modify the pure bisphenol-A epoxy by blending method with various proportions.Aiming to illuminate the curing behavior,mechanical and thermal properties,the blended epoxy systems were characterized by viscosity-time analysis,dynamic mechanical analysis(DMA)at different frequencies and temperatures,mechanical tensile test,thermogravimetric analysis(TGA)and Fourier transform infrared(FT-IR)spectroscopy.The results indicated that the introduction of PU modified epoxy was found to significantly inhibit the viscosity growth rates especially when the content of PU modified epoxy resin is higher than 60%.Notwithstanding the dynamic modulus and T_(g)reduced with the increment of PU modified epoxy,remarkable increment on the elongation at break was found and the flexibility was greatly promoted with the introduction of PU modified epoxy.The proportion of PU modified epoxy in the blends should be put balance considerations to obtain optimal mechanical properties.TGA results and FTIR spectrum demonstrated that the addition of PU modified epoxy did not change the thermal decomposition mechanism and chemical reaction mechanism,but the addition of PU modified epoxy inhibits the curing reaction of epoxy resin by measured and calculated the damping temperature domain
T from 35.7℃ to 48.9℃.

Synthesis and Characterization of Polyurethane and Epoxy Resin Interpenetrating Polymer Network

A series of Polyurethane (PU)/bisphenol A based Epoxy Resin(EP) Interpenetrating Polymer Networks(IPN) were synthesized and characterized by SEM, DSC, TGA and DMTA. It was found that IPN shows the best compatibility and damping properties when the ratio of PU/EP is 80 to 20. The results show that chain-extender and higher molecular weight of PPG are able to improve the properties of compatibility, damping and thermal properties.

水利工程用环氧树脂改性聚氨酯丙烯酸酯性能研究

水利工程金属结构和水工建筑物常遭受腐蚀、高速含沙水流磨蚀破坏,需对其进行便捷有效的防护。利用环氧树脂对聚氨酯丙烯酸酯(PUA)进行改性提高PUA与基体黏结性能,采用紫外光(UV)固化技术制备PUA涂层。研究了环氧树脂改性PUA的化学结构及环氧树脂用量对PUA的力学性能、热稳定性能、耐溶剂性能和抗冲磨性能的影响。结果表明,环氧树脂改性PUA的拉伸强度随着环氧树脂用量增加,呈下降趋势,当加入5%时,PUA拉伸强度为103.0 MPa,材料呈强而脆的特性。环氧树脂加入提升了PUA的拉伸剪切强度,由0.25 MPa增至1.60 MPa。同时,环氧树脂改性PUA具有良好的耐水性能、耐溶剂性能、抗冲磨性能,5%环氧树脂改性PUA抗冲磨强度为800 h/(kg·m^(2))。

聚氨酯和环氧树脂涂层耐水性能对比研究

本文选择了不同类型的聚氨酯(PU)涂层和环氧树脂(EP)涂层作为代表,通过红外光谱、固态核磁共振、热失重分析和热力学性能分析,研究了长期水下浸泡对涂层结构和性能的影响,并进一步对比了上述不同材料的水解稳定性。结果表明,聚醚型聚氨酯(PTMG-PU)涂层具有最优的耐水性,并且其化学结构基本没发生化学水解作用,然而加入陶瓷增强颗粒会降低材料的耐水性,并可能加速水解作用对涂层结构和性能的影响;相同水解条件下,聚酯型聚氨酯(PEA-PU)和EP涂层在水中的耐水性较差,并且可能发生聚合物链的化学水解作用,进而导致材料储能模量的提高。

热塑性树脂增韧环氧树脂复合材料研究进展

为了解决环氧树脂固化导致严重脆弱,低韧性和恶劣的内冲击性缺点,在特定范围内限制适用的问题,本文通过整理近年来环氧树脂增韧的相关文献,研究了热塑性树脂的改性方法和改性后界面情况的进展,对聚砜、聚醚砜、聚醚醚酮、聚酰亚胺等热塑性树脂增韧环氧树脂研究现状进行了分析。研究发现:热塑性树脂增韧环氧树脂的共混体系从均相状态到高交联结构的固定相形态,这种转变极大程度提高了材料的性能。

水性丙烯酸涂层改性研究进展

简单阐述了水性丙烯酸树脂的单体结构、聚合方法以及应用现状;较为系统地总结了根据不同材料改性水性丙烯酸树脂的研究进展,改性材料可归纳为纳米材料、有机硅、有机氟、聚氨酯和环氧树脂以及一些新型材料等。重点论述了改性材料对水性丙烯酸树脂进行改性的反应机理、相应的微观结构及性能提高情况。展望了水性丙烯酸涂料发展的方向。

金属有机框架基阻燃剂在阻燃领域的研究进展

简述了近几年来金属有机框架(MOFs)及其衍生物在阻燃高分子材料领域的应用,重点介绍了MOFs阻燃剂的设计及其对环氧树脂(EP)、聚苯乙烯(PS)、聚氨酯等材料阻燃性能的影响,阐述了可能存在的阻燃机理,并对MOFs阻燃剂未来的发展方向进行了展望。

常见水性涂料的研究进展

水性涂料不仅环保健康,而且生产和使用安全。近年来,水性涂料的发展受到了越来越多研究者的关注,已经成为涂料工业的发展主流之一。介绍了环氧树脂涂料、聚氨酯涂料、聚丙烯酸酯涂料、醇酸树脂涂料和无机富锌涂料共5类常见水性涂料的研究现状及其应用情况,并讨论了水性涂料目前面临的挑战和未来良好的发展前景。

不同高分子防腐材料表面涂层粘附性能变化规律研究

为提高高性能混凝土的耐久性,通过分别在混凝土表面涂一层约3 mm的水性环氧树脂类防腐涂料、聚氨酯类防腐涂料和丙烯酸树脂类防腐涂料,来对比分析有防腐涂料和无防腐涂料的混凝土的抗氯离子性能、抗硫酸根离子性能和抗碳化性能等3种耐久性。试验结果表明,相比较于无涂料混凝土,含有防腐涂料的混凝土抗氯离子侵蚀性能、抗硫酸根离子侵蚀性能和抗碳化性能要好;聚氨酯防腐涂料对混凝土抗氯离子侵蚀性能、抗硫酸根离子侵蚀性能和抗碳化性能等耐久性最强,水性环氧树脂防腐涂料次之,丙烯酸树脂防腐涂料最弱。

树脂在水性工业涂料中的应用综述

工业涂料水性化进程离不开树脂的技术突破。本文对水性丙烯酸树脂、水性醇酸树脂、水性环氧树脂、水性聚氨酯树脂、水性聚酯树脂在水性工业涂料领域应用中的优缺点及研究进展进行了阐述,并展望了未来发展趋势。

应用于幼儿玩具的水型树脂环保材料特性测试研究

幼儿玩具常使用传统的塑料材料,这些材料可能含有对环境和人体有害的化学物质,因此,寻找更环保的材料是一项重要任务。研究将环氧树脂与聚氨酯预聚体结合,得到最终的聚氨酯-环氧树脂合成水性树脂,将新型环保树脂用于幼儿玩具材料中,并对其特性进行测试。实验结果表明,当第三次循环利用后,合成树脂的拉伸强度恢复到了初始强度的90%,可多次进行重复利用,新材料在使用过程中表现出了良好的性能和安全性,能够为幼儿玩具行业提供更环保、安全、可持续的材料选择,保护儿童的健康。

2022-2023年世界塑料工业进展(Ⅲ):热固性树脂

收集了2022年7月-2023年6月世界通用热固性树脂工业的相关资料,介绍了2022-2023年世界通用热固性树脂工业的发展情况。按聚氨酯、酚醛树脂、环氧树脂的顺序,对其产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍。

聚氨酯风电叶片材料及工艺应用研究进展

对比了风电叶片用聚氨酯与环氧树脂本体力学性能和工艺特性的差异。分析了聚氨酯叶片中其他主材的研究进展,包括聚氨酯玻纤复合材料的力学性能和疲劳性能,以及叶片芯材、结构胶等与聚氨酯材料的匹配验证及应用情况。对聚氨酯树脂叶片成型工艺和部分缺陷进行了分析和研究,并提出一些工艺控制建议,希望为叶片材料的替换提供必要依据。

有机硅改性胶粘剂研究进展

丙烯酸酯、环氧树脂和聚氨酯等传统胶粘剂各自存在一些缺点,限制了其在特定领域的进一步应用。通过引入有机硅对传统胶粘剂进行改性,能够获得性能更好的有机硅改性胶粘剂。综述了利用有机硅对丙烯酸酯、环氧树脂和聚氨酯等胶粘剂进行改性的研究进展。

E-51环氧树脂改性混凝土桥梁应用效果与施工技术

为加强公路桥梁用混凝土的强度、韧性等性能,通过聚氨酯对E-51环氧树脂进行改性,制备了一种公路桥梁用C40混凝土,并对其性能进行研究。试验结果表明,在混凝土中掺入改性E-51环氧树脂,会降低材料的抗压强度,当掺入的改性E-51环氧树脂适量时,可以有效增强混凝土的粘接强度和弯曲韧性;当混凝土中掺入4%改性E-51环氧树脂时最佳,此时C40混凝土养护28d时的抗压强度为47.6MPa,其粘接强度以及弯曲断裂能达到最高,分别为2.81MPa和1135N·m,增幅达到23.1%、14.2%和46.3%。综合性能较好,符合实际应用标准,可以用于实际桥梁路面上的铺装应用。

高表面能聚氨酯树脂研究及应用

制备了高表面能的长玻纤增强聚氨酯树脂。研究了聚合物多元醇、交联剂、助剂等对聚氨酯树脂表面能的影响,合成了与环氧树脂表面能一致的聚氨酯树脂,并将玻纤复合的聚氨酯树脂与环氧树脂进行界面结合,探究复合树脂的剪切强度、拉伸强度、抗疲劳性能等。结果表明,通过调整配方组成可以合成与环氧树脂表面能一致的聚氨酯树脂,所得复合树脂的剪切强度高达67.6 MPa,拉伸强度1 760 MPa,实现了1 000万次的抗疲劳性能测试。

环氧树脂增韧改性机理及方法的研究进展

本文针对环氧树脂的增韧改性机理及方法进行了系统性探讨,涉及的改性材料包括橡胶弹性体、热塑性树脂、超支化聚合物、核壳结构聚合物、纳米粒子、热致液晶聚合物。通过论述环氧树脂的增韧改性方法得出改性后的环氧树脂断裂韧性明显改善,弯曲强度和拉伸强度方面也得到了提升。最后对环氧树脂增韧改性方法的未来发展进行了展望。