乳酸开环环氧树脂改性水性聚氨酯的合成及性能研究

环氧树脂中的环氧基团在传统改性水性聚氨酯乳液中易开环,导致乳液不稳定,影响配方设计.选择低相对分子质量乳酸作为环氧树脂的起始剂参与开环反应,以异佛尔酮二异氰酸酯(IPDI)、聚醚(N210)等为主要原料,合成了乳酸开环环氧树脂改性水性聚氨酯乳液.探讨了乳酸开环环氧树脂的加入量和加入方式,对改性的水性聚氨酯进行表征和性能测试表明:乳酸成功打开环氧基团,乳液状态稳定,将其接入水性聚氨酯中可使胶膜的机械性能、耐水性、耐热性能得到提高.     

油气田防腐固井用水性环氧乳液的制备及应用研究

采用聚乙二醇改性环氧树脂与二乙醇胺反应,合成了与环氧树脂分子结构相匹配的非离子型乳化剂,用其制备水性环氧乳液,并对水性环氧乳液有机聚合物用在固井水泥中的防腐蚀性能进行了评价。     

二乙醇胺改性水性环氧树脂的制备研究

采用二乙醇胺对双酚A型环氧树脂(E-44)进行化学改性引入亲水性基团,制备出了稳定性良好的水性环氧树脂。通过研究二乙醇胺用量、反应温度对水性环氧树脂体系稳定性的影响,确定了最佳的原料配比;研究了水性环氧树脂的粒径分布。研究表明:随着二乙醇胺用量的增加,环氧树脂的亲水性增强。随着二乙醇胺与环氧基物质的量比的增大,水性环氧树脂的粒径变小,当二乙醇胺与环氧基的物质的量比为0.5∶1时,能够制备出性能稳定的环氧树脂水溶液。     

一种环氧树脂改性水性聚氨酯涂料的制备及其性能研究

本研究以六亚甲基二异氰酸酯(HMDI)、聚醚二元醇(N210)、2,2-二羟甲基丙酸(DMPA)、一缩二乙二醇(DEG)和双酚F型环氧树脂(EP)等为主要原料,制备环氧改性的聚氨酯水性(WPU)涂料。实验结果表明:环氧树脂中的环氧基发生了开环反应,同时苯环作用导致生成的环氧改性水性聚氨酯乳液的涂膜的耐冲击性、铅笔硬度等性能增强;随环氧树脂用量增加,水性聚氨酯涂料粘度增大,当环氧树脂添加量为6 Wt%-8Wt%时,所得水性聚氨酯乳液性能最佳。     

自乳化环氧乳液的制备及其性能研究

采用环氧树脂E-51与甲基二乙醇胺(MDEA)在加热条件下进行反应,再利用乙酸中和叔胺,制备出反应型季铵盐乳化剂树脂;将该乳化剂树脂与环氧树脂E-20按照一定比例在一定温度下进行接枝反应,得到水性环氧乳液。对环氧乳液进行了FT-IR表征,考察了反应型季铵盐乳化剂树脂与环氧树脂E-20的比例、反应温度、反应时间对水性环氧乳液稳定性、粒径、配漆后涂膜性能等方面的影响。研究结果表明:在60～70℃下,反应型季铵盐乳化剂树脂加量为8%时,制备的水性环氧乳液具有较好的贮存稳定性,与水性环氧固化剂配漆后的涂膜具有较好的耐盐雾、耐酸碱性能和良好的力学性能。     

二乙醇胺改性水性环氧树脂乳液的制备及其性能研究

以二乙醇胺(DEOA)、环氧树脂E-51为主要原料,合成了DEOA化学改性的自乳化水性环氧树脂乳液,并与水性环氧树脂固化剂按一定比例配制成涂膜。采用红外光谱对改性环氧树脂结构进行表征,通过纳米粒度分析仪和透射电镜(TEM)研究了环氧树脂乳液的粒径和形貌,同时研究了反应温度对环氧基转化率的影响,DEOA加入量对乳液稳定性、粒径的影响。结果表明,随着DEOA用量的增加,环氧树脂乳液的稳定性提高,粒径减小且分布变窄。当n(DEOA):n(环氧基)=0.35:1时,乳液粒径约30~60 nm,制备的涂膜铅笔硬度为3H,柔韧性为1 mm,附着力为1级,耐冲击性为50 kg/cm。     

非离子型水性环氧树脂乳液的制备及其性能研究

以聚乙二醇(PEG-4000)、甲基六氢苯酐(MHHPA)和环氧树脂(E51)为主要原料合成了一种非离子反应型水性环氧树脂乳化剂,并通过相反转法用其乳化环氧树脂E51制备出水性环氧树脂乳液。通过一系列样品分析与性能测试确定了乳化剂合成和乳液制备的最佳工艺及配方:酯化反应时间3 h,温度110℃;环氧开环反应时间4 h,温度100℃,催化剂C的用量为0.8%;当乳化剂用量为10%,乳液固含量为50%,所制得的乳液平均粒径较小、分布较窄,并表现出良好的稳定性能和固化性能。     

环氧树脂/氨丙基硅氧烷复合改性水性聚氨酯

以甲苯二异氰酸酯(TDI)、聚丙二醇(PPG-1 000)和二羟甲基丙酸(DMPA)为基础单体预先合成聚氨酯预聚体;采用二乙醇胺开环环氧树脂、氨丙基硅氧烷复合改性制备水性聚氨酯乳液。分别研究了环氧树脂、氨丙基硅氧烷用量对乳液及其涂膜性能的影响,通过傅里叶红外光谱仪、马尔文激光粒度仪和热重分析等方法对乳液及涂膜性能进行了表征。结果表明:当环氧树脂用量为5.6%、氨丙基硅氧烷用量为3%时,制备的水性聚氨酯乳液稳定性好,涂膜附着力为1级,铅笔硬度可达2 H,耐水及耐热性能明显提高。     

水性环氧树脂专用乳化剂的制备及性能研究

采用环氧树脂E-51与二乙醇胺反应合成与环氧树脂分子结构匹配的高分子离子型乳化剂,并利用不同的成盐方式测定其乳化性能.采用相反转法制备出水性环氧乳液.采用溴代乙烷成盐,醋酸调整pH≈5.6合成得到季铵盐型离子表面活性剂.采用高速分散相反转技术制备的环氧乳液,粒径大小在200 nm左右.     

水性环氧树脂黑色油墨的制备

水性油墨已成为当前墨水产业的发展趋势,其优点为大幅减少VOC的排放量,从源头上阻断了大气的污染。本实验用丙烯酸将环氧树脂酯化开环,反应后得到的是环氧酯,然后对环氧酯进行化学改性,用丙烯酸类单体为改性单体,以多聚磷酸为催化剂,以聚(4-苯乙烯磺酸钠)为分散剂,以过硫酸铵为引发剂,以KH560和甲基丙烯酸为功能单体,运用接枝的方法制备水性环氧树脂乳液,最后用水性环氧树脂乳液并与黑色涂料混合,最后制备出水性黑色油墨。     

New polymeric polyol for thermoset coatings: Superacid-catalyzed copolymerization of water and epoxy resins

Though free-radical emulsion polymerization has been studied extensively, published reports of cationic (i.e., acid-catalyzed) polymerizations of emulsified monomers are rare. It was recently discovered that treatment of an emulsion of liquid epoxy resin with select superacid catalysts yields a polymeric polyol. Catalysis with one percent perchloric acid at room temperature yields a product with a number average molecular weight of 1650, and a polydispersity of 5.0 as measured by GPC. The polyol’s structure differs from that of conventional high molecular weight epoxy resins prepared by the advancement process in several ways, including the incorporation of two glycidyl units in the repeat unit. In essence, the product is a copolymer of the epoxy resin and water, in which water is incorporated in the repeat unit structure by reaction with two epoxide groups. A similar product can be prepared by solution polymerization, where the molecular weight is controlled by the ratio of water to epoxy resin. The product was shown to have lower levels of residual bisphenol-A diglycidyl ether (BADGE) and bisphenol-A than conventional advanced epoxy resins. Polyols prepared by these new processes were crosslinked with melamine-formaldehyde resins in waterborne coating formulations which were free of added cosolvent, as well as solventborne coating formulations. The coatings developed excellent solvent resistance at lower bake temperatures than traditional epoxy resins. Presented at the 79th FSCT Annual Meeting in Atlanta, GA, Nov. 5–7, 2001. 7201 Hamilton Blvd., Allentown, PA 18195-1501.     

Synthesis and Properties of a Novel Flame-Retardant Epoxy Resin Containing Biphenylyl/Phenyl Phosphonic Moieties

A novel reactive diol, bis-biphenyloxy (4-hydroxy) phenyl phosphine oxide (BBPHPPO) which contains both biphenylyl and phenyl phosphonic groups was synthesized. Flame retardant advanced epoxy resin was obtained by chain extension of diglycidyl ether of bisphenol-A (DGEBA) with the phosphorus-containing diol (BBPHPPO). The thermal properties and flame retardancy of cured epoxy resin were studied. The resulting BBPHPPO containing epoxy system exhibited higher glass transition temperature than that of advanced epoxy resins prepared from bisphenol-A (BA) and tetrabromobisphenol-A (TBBA). The high char yield and the high LOI value were observed to prove the excellent flame retardancy of this phosphorus-containing epoxy resin.     

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。     

Flame retardant epoxy resins from bisphenol-A epoxy cured with hyperbranched polyphosphate ester

A novel hyperbranched polyphosphate ester (HPE) was synthesized via the polycondensation of bisphenol-A and phosphoryl trichloride. The formed HPE was characterized by FTIR, ¹H NMR and ³¹P NMR to confirm its structure. Then, a series flame retardant epoxy resins from bisphenol-A epoxy cured with HPE and bisphenol-A were prepared. The combustion behavior of the flame retardant epoxy resins was studied using limiting oxygen index (LOI) and cone calorimeter test. The LOI value increased from 23 to 32 when HPE, instead of bisphenol-A, was used as a curing agent. The cone calorimeter test data revealed that the cured bisphenol-A epoxy resin with HPE as a curing agent possessed improved flame retardancy. The photo graphs and scanning electron microscopy (SEM) of char residues confirmed the cone calorimeter results.     

Synthesis and curing kinetics of colored epoxy resin containing azo moiety

Colored epoxy resin containing azo moiety was synthesized by reaction between epichlorohydrin and bis-azodiol, which was synthesized by coupling bisphenol-A with aromatic amine. Colored epoxy resin was characterized by epoxy equivalent weight, IR spectra, Viscosity and UV visible spectroscopy. The curing of colored epoxy resin and DGEBA were characterized by differential scanning calorimetry (DSC). The thermal stability of cured products was characterized by thermogr avimetric analysis (TGA). The cured products have good thermal stability. Several glass fiber epoxy composites were fabricated and their mechanical properties, electrical properties and chemical resistance were studied.     

高沸醇木质素环氧树脂的合成与性能研究

利用高沸醇木质素的化学活性,直接与环氧氯丙烷反应,生成木质素环氧树脂和木质素改性双酚A型环氧树脂,用环氧值、红外光谱、TGA和DSC等对树脂进行表征,并与未改性的双酚A型环氧树脂进行对比。结果表明,高沸醇木质素很容易合成木质素环氧树脂,其最佳合成条件是:n(ECH)∶n(-OH)=8,温度55～60℃,碱浓度为5%;高沸醇木质素环氧树脂能显著提高环氧树脂的耐溶剂性和耐热性。     

Thermal,physical and flame-retardant properties of phosphorus-containing epoxy cured with cyanate ester

Two phosphorus-containing advanced epoxy resins were obtained by chain-extension of diglycidyl ether of bisphenol-A epoxy (DGEBA) resin with 2-(6-oxido-6H-dibenz(c,e)(1,2)-oxaphosphorin-6-yl)-1,4-benzenediol (DOPOBQ), at different stoichiometric ratios. The phosphorus-containing advanced epoxy was separately cured with various dicyanate esters to form flame-retardant epoxy/cyanate ester systems. The effects of phosphorus content and dicyanate ester structure were studied, and compared with those of the control (advanced bisphenol-A epoxy) system. The DOPOBQ-containing epoxy/cyanate ester systems exhibited higher glass transition temperatures, better dimensional stability and better thermal stability.     

星型环氧乳化剂合成及乳液的性能研究

采用自制星型乳化荆合成水性环氧乳液,考察了乳化剂的结构与环氧乳液稳定性及涂膜性能的关系,优化了乳化荆在制备环氧乳液过程中的主要参数。研究结果表明：聚乙二醇和环氧树脂E-20中环氧基与羟基的物质的量比为1．5：1．0、聚乙二醇的相对分子质量为4000、乳化剂用量为10％时,制备的环氧乳液稳定性高、成膜性能优良。     

Convective and radiant (IR) curing of bulk and waterborne epoxy coatings as thin layers. Part I: Methodology

A method for studying the curing of 100 μm-thick epoxy-based layers coated on steel substrates is described. A simple waterborne epoxy reactive system based on a diglycidylether of bisphenol-A prepolymer and with a polyether triamine was set up by emulsifying the epoxy resin with the use of an ethoxylated-nonylphenol emulsifier. The parliculur phenomena involved during the isothermal curing of such an epoxy emulsion were decomposed by considering the same formulation without water and without water + emulsifier. The chemical kinetics were determined by DSC and by size exclusion chromatography. As previously proposed for numerous epoxy-amine reactive systems, for the three types of coatings, a second-order autocatalytic law was able to interpret the data. The presence of water delays the gelation characterized by rheological measurements. As a consequence, the epoxy conversion at the gel point increases. This phenomenon can be related to the inhomogeneous polymerization process during which the epoxy groups can be trapped into the initial epoxy particles. In addition, the microdielectrometry technique was used to follow the curing degree of the epoxy reactive system of thin layers during the drying and curing processes under radiant heatings such as infrared curing.