大豆蛋白胶粘剂的改性研究进展

介绍了使大豆蛋白胶粘剂的胶接强度、起泡性、乳化性、溶解性以及防腐性等得到改善的改性研究,特别综述了提高耐水胶接强度的改性方法[如表面活性剂、尿素、盐酸胍(Gu HCl)、酸碱盐、接枝共聚、共混、酶和有机试剂等改性方法]。最后对大豆蛋白胶粘剂的研究和应用进行了展望。     

改性大豆蛋白胶粘剂的研究进展

天然高分子大豆蛋白有着一些卓越的功能特性，可以用作胶粘剂。而改性大豆蛋白胶粘剂功能特性更优越。近几十年，作为环境友好绿色化工产品，改性大豆蛋白胶粘剂的研究与应用开发均取得了很大的进展，综述了大豆蛋白改性技术、改性大豆蛋白胶粘剂的特性及其应用。     

大豆蛋白胶粘剂的化学改性研究进展

由于石油危机和环境污染,传统的甲醛胶粘剂受到了严峻挑战,用天然可再生物质制取环保、绿色胶粘剂已成为趋势。文章就大豆蛋白胶粘剂性能、化学改性方法及其在环保型胶粘剂的应用前景进行全面描述。     

大豆蛋白乳液胶粘剂的研制

由于以石化原料合成的胶粘剂在生产和使用过程中会对环境带来不良影响,近年来采用可再生资源,如大豆蛋白合成环保型胶粘剂已成为发展趋势。以尿素和亚硫酸钠改性大豆分离蛋白(SPI),并与醋酸乙烯酯(VAc)等复合单体在过硫酸铵(APS)引发下进行接枝共聚反应,合成了性能较好的VAc/SPI接枝共聚乳液胶粘剂,降低了原料成本。通过正交实验研究了不同的反应条件对该乳液胶粘剂性能的影响,优化的反应条件是采用半连续乳液聚合工艺,以改性SPI自身作为保护胶体,改性剂尿素的浓度为3mol/L,复合单体与SPI的质量比为2.0:1,反应温度为68℃,共聚反应时间为4～5h。由此制得的乳液胶粘剂具有良好的综合性能。     

大豆蛋白胶粘剂的研究进展

介绍了大豆蛋白的组成、结构及改性机理,简述了大豆蛋白胶粘剂的发展历史与开发、利用现状,综述了大豆蛋白胶粘刺改性的研究进展,对今后的研究方向进行了展望.     

大豆蛋白木材胶粘剂的研究进展

近年来,在合成高分子胶粘剂受到环保与成本的双重困扰日益显著的背景下,开发新一代环保可持续的木材胶粘剂已刻不容缓。大豆蛋白胶粘剂作为最具应用潜力的天然胶粘剂之一,已经得到了广泛的研究。综述了几种对大豆蛋白进行改性的常用方法,并对大豆蛋白胶粘剂的发展方向进行了展望。     

改性SBS胶粘剂的研制

以丙烯酸酯类混合单体对SBS热塑性弹性体在混合溶剂中接枝共聚，添加混合型增粘树脂，研制成接枝改性的SBS胶粘剂，具有较高的初粘力和终强度。探讨了单体比例、引发剂用量、反应温度、反应时间、增粘树脂对胶液性能的影响。     

乌洛托品改性大豆蛋白胶粘剂性能影响的研究

以大豆蛋白为基体、乌洛托品为交联剂,制备了木材粘接用无醛环保型大豆蛋白胶粘剂。研究结果表明:当胶液pH为7、热压温度为140℃和w(乌洛托品)=7%(相对干基大豆蛋白质量而言)时,大豆蛋白胶粘剂的粘接性能相对最好;FT-IR(红外光谱)中1 236、1 007 cm-1处是乌洛托品中C—N的特征吸收峰,上述峰在pH为7和8时出现,但在pH为4、5、6时消失,表明在酸性、55℃条件下乌洛托品分解后能与蛋白质良好反应;乌洛托品能有效提高大豆蛋白胶粘剂的耐热性,并且较低的pH更有利于提高木材胶粘剂的耐热性。     

醋酸乙烯酯-大豆蛋白接枝共聚乳液胶黏剂的研制

以尿素和亚硫酸钠改性大豆蛋白,与醋酸乙烯酯等复合单体在过硫酸铵引发下进行接枝共聚,合成了性能较好的醋酸乙烯酯-大豆蛋白接枝共聚乳液胶黏剂,降低了原料成本.研究了不同反应条件对乳液胶黏剂性能的影响,优化的反应条件是以聚乙烯醇作保护胶体,采用半连续乳液聚合工艺,复合单体与大豆蛋白比例为3.0:1,引发剂用量1.2%(占单体质量),反应温度控制在70～75℃,共聚时间4.5h,制备的乳液胶黏剂具有最大剪切强度和良好综合性能.     

大豆基胶粘剂的研究进展

介绍了大豆蛋白的结构与组成,综述了近年来国内外大豆基胶粘剂的发展概况和改性进展,提出了研发中存在的问题以及发展大豆基胶粘剂的意义。     

Shear strength and water resistance of modified soy protein adhesives

Soy protein polymers recently have been considered as alternatives to petroleum polymers to ease environmental pollution. The use of soy proteins as adhesives for plywood has been limited because of their low water resistance. The objective of this research was to test the water resistance of adhesives containing modified soy proteins in walnut, maple, poplar, and pine plywood applications. Gluing strength and water resistance of wood were tested by using two ASTM standard methods. Glues with modified soy proteins had stronger bond strength than those containing unmodified soy proteins. Plywood made with glue containing urea-modified proteins had higher water resistance than those bonded with glues containing alkali-modified and heat-treated proteins. After three 48-h cycles of water-soaking, followed by 48 h of air-drying, no delamination was observed for either walnut or pine specimens glued with the urea-modified soy protein adhesives. Gluing strength for wood species with smooth and oriented surface structure was lower than for those with rough, randomly oriented, surface structures. Wood species with greater expansion of dimensions during water-soaking had a higher delamination rate than those showing less expansion.     

PVAc乳胶/改性大豆分离蛋白共混胶黏剂的制备及性能

针对大豆蛋白胶黏剂耐水性差的缺点,用尿素初步改性大豆分离蛋白（SPI）,然后与白乳胶（PVAc）共混合成了共混改性大豆分离蛋白胶黏剂。采用正交实验方法考察了大豆蛋白胶与白乳胶质量比、共混时间、交联剂质量分数、交联时间对大豆蛋白胶黏剂剪切粘接强度的影响,确定了优化配比及制备工艺条件,并在此基础上采用正交试验优化了热压参数。结果表明：大豆蛋白胶与白乳胶质量比10∶1,共混时间1h,交联剂质量分数1.0%,交联时间1.5h,热压温度120℃,热压压强1.2MPa,热压时间2min/mm,涂胶量250g/m2时,测得胶黏剂的干态剪切粘接强度为2.01MPa,按照Ⅰ类胶合板标准测得湿态剪切粘接强度为1.04MPa,并对优化配方进行了结构与性能分析。     

大豆基胶粘剂的性能表征

介绍了大豆蛋白质的结构、组成和大豆基胶粘剂的改性原理;着重介绍了大豆基胶粘剂的力学性能、耐水性能、热学性能、防腐性能、结构特征及表面形貌的实验研究与表征方法;提出了大豆基胶粘剂性能表征中存在的问题及发展方向。     

改性大豆蛋白标签胶的研究

以大豆蛋白为主要原料、正十二硫醇为改性剂,制备改性大豆蛋白标签胶。通过单因素试验法考察了m(蛋白质)∶m(水)比例、改性剂用量、反应体系pH值、反应温度和反应时间等因素对标签胶的黏度、粘接力和耐水性能等影响,并采用正交试验法进一步优选出制备标签胶的最佳工艺条件。结果表明:当反应温度为70℃、m(蛋白质)∶m(水)=1∶8.0、V(改性剂)=0.60 mL和反应时间为40 min时,改性标签胶的综合性能相对最好。     

Graft polymerization of styrene on soy protein isolate

The grafting of styrene on soy protein isolate (SPI) in an 8 moL/L urea aqueous solution initiated by ammonium cerous nitrate and potassium persulfate was studied. The grafted copolymers were characterized by IR spectroscopy and DSC. The results indicated that styrene was grafted on the SPI. The influence of the reaction conditions on the grafting and efficiency percentages was investigated. The grafting and efficiency percentages initially increased and then decreased with the increase of the initiator concentration, monomer concentration, and reaction temperature. With the increase of reaction time, the grafting and efficiency percentages increased. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 1457–1461, 2005     

Rheological properties of emulsions containing modified soy protein isolates

The feasibility of replacing common emulsifiers with soy protein isolates (SPI) in low-calorie salad dressings was evaluated. Structural modifications of SPI were obtained by thermal-acidic treatment with or without neutralization (TH1.6N and TH1.6, respectively). Modification of flow properties of TH1.6 and TH1.6N emulsions by thermal treatment and different protein concentrations was evaluated through shear stress vs. shear rate measurements in a rotational viscometer. TH1.6N isolates generated emulsions with higher shear stress and apparent viscosity than those prepared with TH1.6. Heated TH1.6N emulsions at 10% protein gave the highest values of shear stress and plastic flow behavior. These emulsions had high consistency, viscosity, and elasticity. TH1.6N isolates had lower emulsifying capacity than TH1.6, probably due to the higher protein aggregation produced during neutralization, which prevented protein unfolding. These isolates would be suitable for the preparation of stable emulsions with adequate consistency and elasticity.