环氧树脂弹性体的制备及性能研究

通过分子结构设计,采用长柔性链段的端氨基聚醚与端氨基聚氨酯共同作为固化剂固化环氧树脂,得到了系列环氧树脂弹性体.并对协同固化体系的增韧效果进行了分析,研究了固化物力学性能及热性能的变化规律.研究表明,环氧树脂弹性体冲击韧性可达到52.1 KJ/m2,断裂伸长率可达到160%,并具有良好的综合性能.     

2,2′-双(2-噁唑啉)扩链尼龙6的研究

对2,2′-双(2-噁唑啉)(BOZ)作为扩链剂用于尼龙6的加成型化学扩链做了系统的研究,同时分析了扩链前后尼龙6的热性能和力学性能变化.结果表明,扩链剂用量存在最佳值.用量不足时,偶联反应不充分;用量过量时,封端反应加剧;当扩链剂的加入量为最佳值时,扩链后PA6的特性粘度从1.384 dl/g增加到1.636 dl/g,端羧基含量降低为初始值的40%左右;噁唑啉环在高粘熔体中的扩散速率是扩链反应的一个重要影响因素;扩链后尼龙6的结晶度有所下降,扩链后尼龙6在湿态条件下的缺口冲击强度、断裂伸长率和拉伸强度都有较大的提高.     

P（3HB-co-4HB）／PLA共混物的扩链改性研究

以异佛尔酮二异氰酸酯（IPDI）和亚磷酸三苯酯（TPP）为扩链剂,对聚（3-羟基丁酸酯-co-4-羟基丁酸酯）／聚乳酸[P（3HB-co-4HB）／（PLA）]共混物进行扩链改性．采用毛细管流变仪、电子万能试验机、差示扫描量热仪和扫描电子显微镜等研究两种扩链剂及用量对扩链前后共混物的流变性能、力学性能、结晶性能及断面形态的影响．结果表明：两种扩链剂均显著提高了共混物的熔体剪切黏度和两组分间的相容性,IPDI和TPP添加量分别为1．5份和1．0份时,改性效果最明显,共混物断裂伸长率及缺口冲击强度分别提高了34．5％、69．6％和89．6％、81．0％;IPDI扩链体系的拉伸强度提高8．3％,而TPP扩链体系的拉伸强度略有下降,表明IPDI扩链效果优于TPP．     

皮革涂饰用水乳型聚氨酯结构对性能的影响

本文从聚氨酯结构出发，讨论了聚氨酯软硬段比例，扩链剂和交联剂用量，反应温度及有机硅共聚改性对聚氨酯水乳液成膜性能的影响，结果表明：聚氨酯软段成分越多，涂膜越软，强度越低，伸长率越大；扩链剂和交联剂的用量在一个适当的范围内，才能使乳液兼具贮存稳定，成膜强度高，伸长率大且耐湿擦等综合性能；反应型聚有机硅氧烷与聚氨酯共聚可进一步改善成膜手感并提高涂膜耐湿擦级数。     

应用于凹印版辊的环氧树脂

为了使凹印版辊降低成本、减轻重量、消除环境污染,本文以环氧树脂代替传统的金属材料制作凹印版辊表面材料,研究了环氧树脂固化物的表面硬度及其作为凹印版辊材料的使用性能.结果表明:不同的环氧树脂预聚体和不同的固化剂对其固化物的表面硬度有较大的影响,而不同的无机填料以及无机填料的不同用量对其表明硬度的影响并不明显.用扫描电镜观察其固化物的微观形态发现:纳米SiO2在体系中分散得很好,仍保持了100 nm以下的粒径.但SiO2与环氧树脂的界面结合力不高,致使环氧树脂的硬度没有较大提高.在环氧树脂固化物上进行的激光雕刻和转移印花实验结果表明,选择适当的组成、配比和固化条件,可使环氧树脂固化物达到制作凹印版辊的条件.     

柔性固化剂对环氧沥青结构和性能影响的研究

采用活性增容剂、固化剂、基质沥青和环氧树脂熔融共混,制备得到一种环氧沥青。讨论了固化剂含量对沥青和环氧树脂相容性、所制备的环氧沥青固化体系撕裂断面、力学性能及耐候性能的影响。研究发现,固化剂可以进一步将沥青以1μm大小的球状分散在环氧树脂中,所得到的环氧沥青固化体系撕裂断面呈层状(皮状)破裂。随着固化剂含量的增加,材料对钢板的粘结强度、拉伸强度和断裂伸长率均先升高后降低,经冻融循环后,材料的各项力学强度降低幅度随固化剂含量的增加而降低。当固化剂含量为15～17份时,钢板的粘结强度为47.8MPa,拉伸强度最高可达1.94MPa,断裂伸长率为464%。     

扩链改性对生物塑料聚（3-羟基丁酸酯-co-4-羟基丁酸酯）性能的影响

以异佛尔酮二异氰酸酯（IPDI）和巴斯夫扩链剂-4370（ADR-4370）为扩链剂,采用熔融挤出法制备扩链改性聚（3-羟基丁酸酯-co-4-羟基丁酸酯）[P（3HB-co-4HB）].使用毛细管流变仪、哈克转矩流变仪、力学性能测试仪及扫描电子显微镜等研究扩链剂种类及添加量对P（3HB-co-4HB）流变性能、熔体加工稳定性、力学性能及断面形态的影响.结果表明：两种扩链剂单独或配合使用均能显著提高熔体表观黏度,改善加工性能、断面形态及力学性能.IPDI的添加量为1%时,体系综合性能最佳,其拉伸强度、断裂伸长率和缺口冲击强度分别比纯P（3HB-co-4HB）增加了22%、234%和95%.     

水性漆酚环氧乳液的制备及其性能研究

水性漆酚氧乳液是一种高性能的水性树脂成膜物,能有效地改进漆酚涂料的耐碱特性。在环氧树脂(E20)改性漆酚的基础上,进一步将自制的亲水性扩链剂(MEA-PEGGE-MEA)接枝到漆酚环氧树脂中,从而制备一种可自乳化的水性漆酚环氧树脂。利用傅里叶红外光谱(FT-IR)、凝胶渗透色谱(GPC)、激光粒度仪对产物进行了表征分析,在此基础上并对漆膜性能进行了测试。结果表明:漆酚与E20摩尔比为1∶2,催化剂用量为5%,溶剂用量为45%,130℃反应5h制备的漆酚环氧树脂产率较高;将摩尔比(MEA∶PEGGE)为5∶4所制得的MEA-PEGGE-MEA加成物加入到漆酚环氧树脂中,反应温度75℃、反应时间5h,制备的水性漆酚环氧树脂水分散稳定性好,配制成涂料后具有良好的力学性能和耐碱性能。     

一种高性能紫外光固化涂料的制备与性能

实验以酚醛环氧树脂(F-51)、邻甲酚缩水甘油醚(JX-017)、丙三醇三缩水甘油醚(662)和三芳基锍鎓六氟锑酸盐(UV-6976)作为原料制备了一种阳离子型紫外光固化涂料。并对该紫外光固化涂料的光固化膜的冲击强度、铅笔硬度、拉伸性能和断裂伸长率进行了分析。实验结果表明:当涂料中酚醛环氧树脂(F-51)质量分数为60%、阳离子引发剂三芳基硫鎓氟锑酸盐(UV-6976)质量分数为5%、邻甲酚缩水甘油醚(JX-017)质量分数为20%和丙三醇三缩水甘油醚(662)质量分数为15%时,所制备的紫外光固化涂料综合性能最佳,其紫外光光固化膜的拉伸强度为23.15 MPa,冲击强度为48 kg·cm,断裂伸长率为10.65%以及铅笔硬度为6 H。     

ATPU/环氧树脂固化物热稳定性的研究

采用热重法(TG-DTG)研究了2种含有柔性链和刚性结构单元的端胺基聚氨酯(ATPU-2和ATPU-1.5)对环氧树脂E-44固化物热稳定性特点和热分解动力学的影响。结果表明,固化剂ATPU-2与E-44固化物的热分解温度高于ATPU-1.5/E-44体系的固化物,ATPU-2/E-44固化物的分解残余量也高于ATPU-1.5/E-44体系。表明ATPU-2/E-44体系具有更好的热稳定性。固化反应动力学研究表明ATPU-2/E-44固化物的分解反应活化能高于ATPU-1.5/E-44体系。     

Damping properties of flexible epoxy resin

Amino-terminated polyethers and amino-terminated polyurethane were used as curing agent to cure the epoxy resin together and get a series of cured products. The damping properties of the composites were studied by DMA test at different measurement frequencies. Damping mechanical tests show that the flexible epoxy resin has higher loss factor than common epoxy. The highest loss factor reaches 1.57. Also the height and position of loss factor peak of the flexible epoxy resin varies by changing the content of amino-terminated polyethers. Results shows that the flexible epoxy resin can be used as damping polymer materials at room temperature or in common frequency range.     

Curing behavior of epoxy asphalt

The curing process of epoxy asphalt was analyzed by Fourier transform infrared (FT-IR) spectroscopy. Effect of curing temperature on viscosity of epoxy asphalt, and changes of mechanical properties with curing time were investigated. The evolution of concentration of epoxy band was followed as a function of the applied curing process. The experimental results indicate that the curing reaction rate of epoxy asphalt is invariable before 70 min at 120 °C, and it decreases when curing time exceeds 70 min. The viscosity of epoxy asphalt increases slowly with curing time at initial curing stage. But it increases quickly after initial curing stage and the initial curing time decreases as the curing temperature increases. The tensile strength increases slowly at incipient curing stage and increases rapidly when curing time is form 20 min to 70 min. The elongation at break shows a decrease with curing time, but it exceeds 200% after cured.     

丙烯酸酯改性己二胺固化剂对环氧树脂性能的影响

利用丙烯酸酯类对己二胺进行改性,作为环氧树脂的室温固化剂。利用红外光谱分析了固化剂的氨解变化,讨论了改性固化剂对环氧树脂固化反应产物的拉伸、弯曲、冲击等性能的影响。实验结果表明,丙烯酸酯改性的己二胺固化剂可以在室温下固化环氧树脂,所得的环氧树脂具有较好的力学性能。     

电工环氧树脂固化工艺研究

电工环氧树脂的固化剂选用甲基六氢苯酐（MHHPA）酸酐体系,并对固化浇注工艺及填料改性处理固化体系进行研究.固化剂、填料等改性剂的用量,固化体系的配方配比、工艺特性等方面对固化产物电学性能、机械性能都产生一定的影响.固化体系采用环氧树脂100份,甲基六氢苯酐86份,咪唑0.8份,二氧化钛3份,偶联剂KH5501份时,固化产物抗拉强度61.972 MPa,冲击强度6.172 kJ/m^2,介电常数2.268,介电损耗角正切0.001 9,体积电阻率3.076×1015.此种环氧树脂材料可适用于高压大电流开关、高压变压器绝缘子及高压组合电器等高科技领域,满足其在电工工业领域的应用要求.     

干式变压器环氧树脂浇注工艺探索

通过对环氧树脂浇注料中固化剂的用量、固化温度及时间对固化物性能的影响，对干式变压器环氧树脂浇注工艺进行探索，提出了确定最佳工艺条件的方法和改进浇注体性能的措施。     

Curing of Epoxy Resin Induced by Femtosecond Laser Pulse

The possibility of curing of epoxy resin induced by femtosecond laser beam was explored through choosing different initators.Absorption spectroscopy, infrared spectroscopy（IR）,stereomicroscopy and scanning electron microscopy（SEM0 were applied to analyze the structure of epoxy resin systems after irradiation with a femtosecond laser beam.The experimental results show that the epoxy resin systems containing diaryliodonium salts can be cared by irradiation of femtosecond laser pulse,while the systems containing benzoing can not be cured.It is found that diaryliodonium salts decompose under the irradiation of femtosecond lase pulse through multi（two）-photon absorption,initiating the ring-opening polymerization of epoxy resin.And the appearance of cured area has a sheet structure consisting of many tiny lamellar structures.     

COMPARISON OF THE E44 EPOXY RESINS IN DIFFERENT CONTENTS OF CURING AGENT BY MICROWAVE AND THERMAL CURING METHODS

This paper discusses the fundamental principle of microwave heating, and based on the advantages of microwave heating, use maleic anhydride as curing agent. The technology of microwave curing E44 epoxy resins is investigated, the mechanical properties of cured epoxy resin samples in different contents of curbing agent by microwave and thermal curing methods are measured respectively, and then some experimental results for which are obtained. At last, this paper analyses why microwave curing can improve mechanical property of epoxy resin.     

改性环氧丙烯酸酯预聚物的制备

采用甲苯二异氰酸酯(TDI)对自制环氧丙烯酸酯进行改性,制备具有氨酯-丙烯酸互穿网络结构的预 聚物。考察了改性剂用量、反应时间、反应温度、催化剂种类及用量对转化率的影响,利用红外光谱对改性产物结构 进行表征,并对改性后固化膜拉伸强度和断裂伸长率进行分析。结果表明,改性剂甲苯二异氰酸酯与环氧丙烯酸酯 的物质的量比为0.25∶1、反应时间5h、反应温度为75 ℃、复合催化剂(三乙胺和二月桂酸二丁基锡的质量比为 1∶1)加入质量分数为0.1%时,反应转化率最高。红外光谱表明实验得到改性预聚物。     

Preparation and characterization of carboxylterminated poly (butadiene-co-acrylonitrile) -epoxy resin prepolymers for fusion-bonded-epoxy powder coating

Liquid carboxyl-terminated poly(butadiene-co-acrylonitrile)(CTBN)-epoxy resin(EP) prepolymers were prepared with different contents of CTBN.The chemical reactions between EP and CTBN were characterized by Fourier ransform infrared(FTIR) spectroscopy and gel permeation chromatography(GPC).The scanning electron micrograph(SEM) and dynamic mechanical analysis(DMA) of curing films showed phase separation,and the rubber particles were finely dispersed in the epoxy matrix.Mechanical properties analysis of curing films showed that impact strength and elongation at break increased significantly upon the addition of CTBN,indicating good toughness of the modified epoxy resins.Thermogravimetric analysis(TGA) showed that the incorporation of CTBN had little effect on the thermal stability of EP.Fusion-bonded-epoxy(FBE) powder coatings modified with CTBN-EP prepolymers were prepared.The experimental results demonstrate the ability of CTBN-EP prepolymers,toughening technology to dramatically enhance the flexibility and impact resistance of FBE coatings without compromising other key properties such as corrosion protection.     

双（羧基邻苯二甲酰亚胺）的合成及其固化环氧树脂的研究

采用芳香族二胺与偏苯三酸单酐合成了一种新型环氧树脂固化剂──双（羧基邻苯二甲酰亚胺）（ＢＣＰＩ），研究了其合成方法及有关的反应机理，并对其固化环氧树脂的性能进行了初步探讨。