耐蚀玻璃钢常用树脂的结构性能及机理

本文分析了耐腐蚀玻璃钢常用五类热固性树脂的结构与性能，探讨了不饱和聚酯树脂和环氧树脂的腐蚀机理，介绍了树脂选用中应注意的一些问题。     

耐蚀玻璃钢常用树脂的结构性能及机理

本文分析了耐腐蚀玻璃钢常用五类热固性树脂的结构与性能,探讨了不饱和聚酯树脂和环氧树脂的腐蚀机理,介绍了树脂选用中应注意的一些问题。     

新型耐腐蚀不饱和树脂的研制

介绍了用PET废料制备新型耐腐蚀不饱和树脂工艺,确定了配料及反应温度.对该不饱和树脂的热稳定性及耐腐蚀性进行了实验,其性能优于通用型不饱和树脂.     

不饱和树脂工艺品镀金

随着人民生活水平不断提高，对工艺品需求增加。９０年代初，珠江三角洲地区引进硅橡胶制模，不饱和树脂浇注工艺品，迎合了这一时尚。生产者无需高深的艺术造诣，只要有样件，就能复制产品，不需昂贵的金属模，操作容易，可生产造型精美的工艺品，成本低廉，生产批量可大可小。如果在不饱和树脂工艺品上电镀薄金、薄银，提高工艺品的档次和品位，价格又适合大众化消费。但不饱和树脂结构致密，表面光滑，采用化学沉铜以后进行电镀，结合力尚不满意。要在不饱和树脂上电镀贵金属，必须另辟蹊径。本文介绍不饱和树脂工艺品，采用真空镀膜作金…     

乙烯基酯固化适宜的引发剂

乙烯基酯树脂又称环氧乙烯基酯树脂,是由环氧树脂与不饱和有机一元羧酸进行开环酯化反应而得的分子两端含有乙烯基酯基团、中间骨架为环氧树脂的一类不饱和聚酯树脂,主要类型有丙烯酸-环氧型、甲基丙烯酸-环氧型、甲基丙烯酸-酚醛环氧型等。乙烯基酯树脂可以认为是丙烯酸改性的环氧树脂,具有环氧树脂和丙烯酸不饱和聚酯树脂的优良性能,化学结构与环氧树脂相似,工艺性能与不饱和聚酯树脂相近。因而粘接力强、交联密度大、固化快速、耐化学腐蚀性极好,非常适合制造耐腐蚀胶粘剂、密封胶、金属快速修补剂、光固化胶粘剂、防腐涂料等。     

FE—110~#乙烯基酯树脂的合成

<正> 1 前言乙烯基酯树脂是60年代发展起来的一类特殊的不饱和聚酯树脂,如丙烯酸树脂、丙烯酸环氧树脂和乙烯酯等,一般由丙烯酸或甲基丙烯酸与环氧树脂加成聚合而得。由于其分子结构的特殊性,它既具有与不饱和聚酯树脂相似的工艺性能,在化学结构上又与环氧树脂近似,可称为是结合了不饱和聚     

气干性耐腐蚀不饱和树脂的研究

采用顺酐和二醇制得耐腐蚀不饱和树脂,再将其与由三羟甲基丙烷二烯丙基醚(TMPDE)、TDI和苯乙烯反应得到的含有气干性基团的预聚物接枝聚合得到气干性耐腐蚀不饱和树脂。研究了预聚物加入量对树脂气干性以及接枝聚合反应温度和时间对反应程度的影响,并测试了产品的耐腐性和力学性能。结果表明,自制的耐腐蚀不饱和树脂、TDI、TMPDE及苯乙烯的质量配比为10∶1∶1∶2,聚合反应温度75～85℃,反应时间2.0 h时得到的不饱和树脂性能最佳,无缺口冲击强度为7.56 kJ/m2,弯曲强度为71.7 MPa,弯曲模量为3.21 GPa,热变形温度为110℃,产品可耐强酸、强碱、强氧化介质的长期腐蚀,气干性好,固化优良。     

耐候性阻燃胶衣树脂的研究

采用一种特殊化学结构的含溴化合物为主要原料，合成了一种具有老化变黄度小、阻燃性能优越的不饱和聚酯树脂，介绍了此树脂的化学物理性能。以此树脂为基体，研制开发了耐候性阻燃胶衣树脂，并列出了此胶衣树脂的耐候性数据。     

酚醛环氧型乙烯基酯树脂固化过程的研究

<正> 酚醛环氧型乙烯基酯树脂(以下简称W2-1树脂),是一类新型的不饱和聚酯树脂。它可用通用不饱和聚醋树脂室温固化的引发体系进行室温固化,固化树脂具有优良的机械强度、耐温性能以及耐腐蚀性能。然而,固化树脂的各种化学、物理性能在很大程度上取决于固化树脂的结构。本文研究了多种不饱和聚酯树脂的氧化-还原引发体系及固化条件对W2-1树脂固化过程及最终固化树脂性能的影响,并与通用不饱和聚酯树脂(307树脂〕和双酚A型聚酯树脂(323树脂)进行了比较。     

企业信息

<正>华东理工大学华昌聚合物有限公司国家重点高新技术企业、上海市高新技术企业、上海市科技小巨人企业、上海市知识产权示范企业,主要从事耐腐蚀环氧乙烯基酯树脂与不饱和聚酯树脂、风电叶片专用高性能树脂、高速铁路新材料、船舶/游艇专用树脂、特种核纯树脂     

不饱和聚酯树脂的合成研究进展

综述了不饱和聚酯树脂(UPR)的合成研究进展,特别针对功能化不饱和聚酯树脂如气干性、阻燃性、强韧性、光敏性和低收缩性不饱和聚酯树脂的合成方法和特性进行了介绍,对了未来不饱和聚酯树脂的发展方向和广泛的应用前景的展望。     

Curable resins based on recycled poly(ethylene terephthalate) for coating applications

Poly(ethylene terephthalate) waste was depolymerised in the presence of diethylene- or tetraethylene glycol and manganese acetate as a catalyst. An epoxy resin was then prepared by the reaction of these oligomers with epichlorohydrin in presence of NaOH as a catalyst. The produced oligomers were condensed with maleic anhydride and ethylene glycol to produce unsaturated polyester. The chemical structures of the resulting epoxy and unsaturated polyester resins were confirmed by ¹HNMR. The vinyl ester resins were used as cross-linking agents for unsaturated polyester resin diluted with styrene, using free radical initiator and accelerator. The 2-amino ethyl piprazine was used as hardener for epoxy resins. The curing behaviour of the unsaturated polyester resin, vinyl ester resins and styrene was evaluated at different temperatures ranged from 25 to 55 °C to calculate the curing activation energy of the system. The cured epoxy and unsaturated polyester resins were evaluated in coating application of steel.     

The effect of the chemical structure of low-profile additives on the curing behavior and chemorheology of unsaturated polyester resin

An experimental study was conducted to investigate the effect of the chemical structure of low-profile additives on the curing behavior and chemorheology of unsaturated polyester resin during isothermal cure. For the study a general-purpose unsaturated polyester resin was cured in the presence of t-butyl perbenzoate as Initiator. The curing behavior of the resin was investigated using differential scanning calorimetry (DSC). Three different thermoplastic low-profile additives were used, namely poly(vinyl acetate) (PVAc), poly(styrene-co-butadiene), which is also known as KRATON DX-1300, and dehydrochlorinated Isobutylene/isoprene copolymer, often referred to as conjugated diene butyl (CDB) rubber. Each of the these additives, about 30 weight percent, was first dissolved in styrene. The solution was then mixed with unsaturated polyester resin and CaCO₃. The CaCO₃ particles helped stabilize the emulsions consisting of resin and KRATCN, and of resin and CDB. For each resin formulation, a series of isothermal DSC runs were made at various levels of cure pressure. It was found that for all three low-profile resins investigated, the final degree of cure went through a maximum as cure pressure was increased from atmospheric to 6.21 MPa (900 psi). We have observed evidence that in the presence of an initiator generating free radicals, the unsaturated double bonds in the KRATON and CDB undergo grafting reactions with the styrene monomers and unsaturated polyester resin, increasing the glass transition temperature of KRATON and CDB, to an extent which varies with the cure conditions employed. Both steady and oscillatory shearing flow properties were determined using a cone-and-plate rheometer. The rheological measurements indicate that the resin/CaCO₃/KRATON and resin/CaCO₃/CDB systems give rise to gel times shorter than the resin/CaCO₃/PVAc system. It is concluded that both KRATON and CDB are more effective, both for enhancing the rate of cure of unsaturated polyester resin and imparting impact properties to the cured composites, than those thermoplastic low-profile additives that contain neither unsaturated double bonds nor a chemical structure that has rubber-like properties in the solid state.     

天然纤维增强不饱和聚酯复合材料的界面研究进展

天然纤维具有强度高、环境友好、密度小、成本低等优点,可替代玻璃纤维或碳纤维作为不饱和聚酯树脂的增强材料。由于天然纤维与不饱和聚酯的界面结合较差,复合材料的机械性能不高,通常采取物理或化学的方法对其进行预处理,以提高纤维与基体之间的界面结合强度。本文总结了天然纤维常用的几种表面改性方法及其对不饱和聚酯树脂的增强效果。     

某些触变剂对不饱和聚酯树脂触变性能影响的研究

本文探讨了不饱和聚酯树脂触变机理,认为不饱和聚酯树脂的触变性,主要是由触变剂与不饱和聚酯树脂间的氢键力决定的.     

利用废聚酯制备对苯型不饱和聚酯树脂的研究

介绍了利用废聚酯制备对苯型不饱和聚酯树酯的方法。研究表明,该工艺简单合理,产品的耐腐蚀性、耐热性、机械性能和电性能优良     

聚酯下脚料生产对苯二甲酸型不饱和聚酯的研究

研究了利用聚酯下脚料生产对苯二甲酸型不饱和聚酯树脂的方法。分析了原料配比及工艺参数对产品性能的影响,将对苯二甲酸型不饱和聚酯的性能与邻苯二甲酸型不饱和聚酯及间苯二甲酸型聚酯的性能进行了比较。结论认为对苯二甲酸型不饱和聚酯树脂是一种性能良好的耐腐蚀树脂。     

浅谈双环戊二烯改性不饱和聚酯树脂的生产工艺

采用双环戊二烯改性不饱和聚酯树脂,使得不饱和聚酯树脂具有很多独特的优异性能。主要介绍以双环戊二烯与顺丁烯二酸酐合成双环戊二烯马来酸单酯为基础,经进一步扩链（加入多元醇酯化）之后得到不饱和聚酯树脂的合成过程。剖析了生产设备、生产工艺流程。