有机硅改性丙烯酸酯乳液在玻璃纤维套管上的应用

将二甲基二乙氧基硅烷、甲基三乙氧基硅烷、苯基三氯硅烷、二苯基二氯硅烷、乙烯基三乙氧基硅烷等有机硅单体在13～19℃下乳化、水解、缩聚,得到有机硅低聚物;然后,与丙烯酸、丙烯腈、甲基丙烯酸甲酯、甲基丙烯酸丁酯、甲基丙烯酸月桂酯、丙烯酸乙酯等丙烯酸酯单体共聚,制成乳胶膜的玻璃化温度为5～15℃的有机硅改性丙烯酸酯乳液。将其涂覆在玻璃纤维套管上,套管的耐电压性、耐高低温性能与涂覆丙烯酸酯乳液的玻璃纤维套管相比均得到改善。     

有机硅改性丙烯酸聚氨酯涂料的制备

以过氧化二苯甲酰为引发剂,将不同用量的γ-甲基丙烯酰氧基丙基三甲氧基硅烷与苯乙烯、丙烯酸酯类单体进行共聚,合成有机硅改性含羟基丙烯酸树脂。红外光谱证实有机硅成功地引入到丙烯酸树脂中。用该有机硅改性树脂与N3390固化剂反应,制成有机硅改性聚氨酯涂料,考察了有机硅含量对漆膜性能的影响。     

保护膜用有机硅改性丙烯酸酯乳液压敏胶

襄樊航天化学动力总公司的毛胜华等人以八甲基环四硅氧烷（D4）、γ-甲基丙烯酸酰氧基丙基三乙氧基硅烷、六甲基二硅氧烷为原料,四甲基氢氧化铵为催化剂,二甲基亚砜为促进剂,通过本体聚合合成了含双键的有机硅大分子;再与丙烯酸酯单体进行乳液共聚,制得了有机硅改性丙烯酸酯乳液压敏胶。将其涂在聚乙烯膜上制成的保护膜贴在被保护表面能有效抑制剥离强度的增长。随着有机硅大分子摩尔质量的增大,压敏胶剥离强度的增长速度加快;随着有机硅大分子用量的增大,     

有机硅改性丙烯酸酯的合成方法及其涂料的应用现状

综述了聚硅氧烷改性丙烯酸酯树脂的合成方法 (硅氧烷水解物与丙烯酸酯共混改性、含羟基的聚硅氧烷预聚体与含羟基的丙烯酸酯预聚体缩合、含双键的硅烷单体和丙烯酸酯单体共聚、含氢硅烷与丙烯酸酯类加成等);比较了防腐领域推荐应用的3种不同树脂面漆的实际应用效果。     

研发动态

亲水性氨基硅油;3,3,3-三氟丙基三甲氧基硅烷;直接法合成三乙氧基硅烷;有机硅改性丙烯酸酯乳液;     

非烘干型耐高温漆的制备及性能

以甲基三乙氧基硅烷,二甲基二乙氧基硅烷,苯基三乙氧基硅烷为主要原料合成有机硅中间预聚物,将其与双酚A型环氧树脂缩聚反应制得环氧改性有机硅树脂。按耐高温设计要求选择涂料所需的颜填料及助剂,以低相对分子质量聚酰胺树脂作为固化剂制备涂料。按国家标准进行漆膜的制备,分别对环氧改性有机硅树脂涂料的成膜性、耐冲击性、附着力、以及耐高温性能进行测试。结果表明:改性后的树脂兼备环氧树脂和有机硅树脂的综合性能,漆膜室温条件下5d固化,柔韧性合格,耐冲击性≥50cm,附着力测试为2级,350℃漆膜保持不变。     

紫外光固化有机硅改性环氧丙烯酸酯树脂的制备及性能

通过双酚F环氧树脂(EP)和丙烯酸的开环反应合成双酚F环氧丙烯酸酯树脂(BPFEA),然后以苯基三乙氧基硅烷(PTES)为改性剂接枝改性双酚F环氧丙烯酸酯树脂,系统研究不同改性比例下有机硅改性环氧丙烯酸酯树脂(PTES-BPFEA)的力学强度、柔韧性、耐热性等性能的影响。在10%的改性比例下有机硅改性树脂的综合性能最好,树脂的断裂伸长率达到17. 2%、柔韧性为1mm、铅笔硬度为6H,且树脂的吸水率较低,树脂的耐热性和耐碱性都得到增强。     

有机硅低聚体合成工艺

采用一甲基三乙氧基硅烷、二甲基二乙氧基硅烷、一苯基三乙氧基硅烷未完全水解制备了含乙氧基的有机硅低聚体。通过正交实验分析确定最佳工艺条件为,原料配比R/S i=1.4,Ph/R=0.2,反应时间为2.5 h,反应温度为80℃。对最佳工艺条件下的有机硅低聚体进行红外光谱表征,低聚体剪切强度可达2.92 MPa。     

改性用有机硅低聚体的合成研究

有机硅低聚体的研究是促进有机硅及其改性树脂发展的重要因素.本文通过正交实验详细讨论了有机硅低聚体合成工艺的影响因素.结果表明:加水量是影响低聚体合成的主要因素,当加水量为完全水解量的60%以下时,能合成贮存性稳定且适合于改性的有机硅低聚体.另外,用FTIR对合成的低聚体进行表征,其结构与理论相符.     

有机硅丙烯酸酯乳液

中国石油大学的张庆轩等人以甲基丙烯酸酯单体、乙烯基三乙氧基硅烷为原料,SDS和OP-10为复合乳化剂,通过种子乳液半连续法合成了有机硅改性丙烯酸酯聚合物乳液,并对其粒子形态进行了分析。结果表明,通过种子乳液半连续聚合工艺可得到固体质量分数为42％,     

双酚-S改性溴代双酚-A型环氧树脂的反应动力学

本文研究了双酚-S、四溴双酚-A和环氧氯丙烷的反应动力学,测定了反应级数和反应速率常数,比较了两种双酚的反应活性和由其形成的环氧树脂的反应活性,为合成这种类型的环氧树脂提供了动力学参数。     

碱性树脂催化合成生物质五元环状碳酸酯

生物质材料环氧大豆油和CO2在碱性树脂D201的催化下,通过环加成反应生成五元环状碳酸酯。近一步对D201树脂进行改造和改性,得到系列新型碱性树脂催化剂,考察了温度、时间、催化剂种类等因素对反应的影响。结果表明,制备的碱性树脂催化剂的催化活性均高于D201树脂,其中以碘离子改进型碱性树脂催化剂的催化活性最高,在反应温度为120℃、反应时间为12 h的条件下,可使环氧大豆油的转化率达到90%以上。     

Resol‐type phenolic resin from liquefied phenolated wood and its application to phenolic foam

A liquefied wood‐based resol resin was prepared with excellent yield by a reaction of liquefied wood and formaldehyde under alkaline conditions. The effects of various reaction parameters on the extent of the yield of the resol resin, unreacted phenol content, and viscosity were investigated. Milder resol resinification conditions were required as compared to those used in conventional methods. The liquefied wood‐based resol resin was successfully applied to produce phenolic foam using appropriate combinations of foaming agents. Diisopropyl ether with a relatively higher boiling temperature was suitable for the foaming of liquefied wood‐based resol resin. Hydrochloric acid and poly(ethylene ether) of sorbitan monopalmitate were used as a catalyst and a surfactant, respectively. The obtained foams showed satisfactory densities and compressive properties, comparable to those of foams obtained from conventional resol resin. Foams with low density were obtained by the blending of liquefied wood‐based resol resin and conventional resol resin. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 468–472, 2002; DOI 10.1002/app.10018     

Curing characteristics of epoxy resin systems that include a biphenyl moiety

The curing characteristics of epoxy resin systems that include a biphenyl moiety were investigated according to the change of curing agents. Their curing kinetics mainly depend on the type of hardener. An autocatalytic kinetic reaction occurs in epoxy resin systems with phenol novolac hardener, regardless of the kinds of epoxy resin and the epoxy resin systems using Xylok and DCPDP (dicyclopentadiene‐type phenol resin) curing agents following an nth‐order kinetic mechanism. The kinetic parameters of all epoxy resin systems were reported in terms of a generalized kinetic equation that considered the diffusion term. The fastest reaction conversion rate among the epoxy resin systems with a phenol novolac curing agent was obtained in the EOCN‐C epoxy resin system, and for systems with Xylok and DCPDP hardeners, the highest reaction rate values were obtained in NC‐3000P and EOCN‐C epoxy resin systems, respectively. The system constants in DiBenedetto's equation of each epoxy resin system with different curing agents were obtained, and their curing characteristics can be interpreted by the curing model using a curing agent as a spacer. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 1942–1952, 2002     

锌粉催化合成含硅芳炔树脂

以二乙炔基苯和二甲基二氯硅烷为原料,通过锌粉催化合成含硅芳炔树脂,确定了合成产物的结构. 结果表明,以乙腈为溶剂、锌粉过量200%、温度80℃、反应时间10 h为最佳反应条件,反应收率达82%以上;所制含硅芳炔树脂有良好的加工性能,在约170℃可发生交联固化反应;树脂的热稳定性良好,在N2气氛下失重5%时的温度为529℃,800℃时树脂残留率约为85%.     

Novel nitrogen‐containing epoxy resin. I. Synthetic kinetics

A novel nitrogen‐containing epoxy resin was synthesized by two steps: (1) condensation reaction between xyleneformaldehyde resin and phenol, to obtain thermoplastic xylenephenolformaldehyde (XPF) resin; and (2) addition reaction between XPF resin and triglycidyl isocryanurate (TGIC). The synthetic kinetics of XPF resin were intensively investigated by gel permeation chromatography (GPC). The results showed that XPF resin, with different molecular weights and low content of free phenol, could be obtained by changing the reaction conditions. The kinetics of reaction between XPF resin and TGIC was monitored by GPC and epoxy value titration. The results showed that the percentage conversion of TGIC was >85% within 60 min at 140°C and the epoxy value, about 0.3–0.4 mol/100 g, varied with the reaction conditions. This novel epoxy resin exhibited good stability of storage and could be used as a basic resin for making prepreg and laminate. The structures of XPF and XT resins were characterized by IR and ¹H‐NMR spectra. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96:723–731, 2005     

萘-萘酚-苯甲醛沥青树脂的合成研究

在浓硫酸的催化作用下,采用阳离子聚合法在萘-苯甲醛二元组分沥青树脂分子链上引入了萘酚分子,合成了萘-萘酚-苯甲醛三元组分沥青树脂。用FT-IR光谱仪表征了合成树脂的结构。通过单因素实验,考察了合成条件对沥青树脂软化点、结焦值和黏结强度等黏结性能的影响规律。实验结果表明,合成萘-萘酚-苯甲醛沥青树脂适宜的工艺条件:萘、萘酚和苯甲醛的物质的量比为0.67∶0.33∶1,反应温度为160℃,反应时间为300 min,催化剂用量为10%。在此条件下,合成沥青树脂的软化点为87.5℃,结焦值为32.1%,黏结强度为41.1。改变反应体系中萘酚的物质的量,能获得具有不同黏结性能的萘-萘酚-苯甲醛三元组分沥青树脂。     

Synthesis,Characterization, and Glass Reinforcement of Flame Retardant Acrylated Poly(Ester-Amide) and Flame Retardant Poly(Ester-Imide) Resins Based on Brominated Epoxy Resin

Bisphthalamic acids were prepared by reaction of phthalic anhydride and aliphatic diamines. Flame retardant poly(ester-amide)s were prepared by reaction of brominated epoxy resin with bisphthalamic acids and post reaction was carried out with acryloyl chloride to obtained acrylated flame retardant poly(ester-amide) resins. Bismaleimides were prepared by reaction between aromatic diamines and maleic anhydride. Carboxy terminated bismaleimides were prepared by Michael addition reaction of bismaleimides and 4-amino benzoic acid. Flame retardant poly(ester-imide)s were prepared by reaction between carboxy terminated bismaleimides and brominated epoxy resin. All the obtained products were characterized and analyzed by making composites.     

响应面优化法研究果糖苯酚树脂胶黏剂的合成

以果糖代替甲醛,在碱性条件下合成了果糖苯酚树脂胶黏剂。用响应面优化法对果糖苯酚树脂的合成条件进行了优化。以树脂黏度为考察指标,根据Box-Behnken的中心组合设计原理对实验进行设计和结果分析。用响应面优化法研究了温度、时间和催化剂用量对反应的联合影响,得出最佳工艺条件为:反应温度72.36℃,反应时间6.96h,催化剂用量7.98%。在此条件下,树脂的黏度为27.67s。同时用红外光谱(IR)对树脂结构进行了分析。     

一种新型胺基树脂的制备

以乙酰化聚苯乙烯微球为原料经Mannich反应制备了一种新型胺基树脂,该树脂可替代氯甲基树脂制备的阴离子交换树脂及酶固定化胺基载体,因此,避免了氯甲基树脂生产中使用氯甲醚等致癌物质及多取代、二次交联等副反应的问题. 讨论了反应温度和时间、物料比、加料方式、介质中的水量等因素的影响. 最佳反应条件为无水乙醇介质,胺:醛:盐酸:乙酰基(摩尔比) 10:10:3.3:1,反应温度100℃,反应时间12 h,制备的胺基树脂氮含量为13.7 mmol/g. 机理研究显示乙酰基发生 多取代反应.