四硼酸钠对SDS改性大豆蛋白胶性能的影响研究

为了解决大豆蛋白胶易腐蚀降解、变稀和稳定性差的问题,以大豆分离蛋白(SPI)为主要原料,十二烷基硫酸钠(SDS)为改性剂,并添加四硼酸钠,制得大豆蛋白改性胶粘剂.着重探讨了四硼酸钠用量对大豆蛋白胶流变行为、稳定性、粘接性能和耐水性能的影响.研究结果表明:添加了四硼酸钠的大豆蛋白胶,固化后表面更为平整和均匀;随着四硼酸钠...     

大豆蛋白基胶黏剂的研究进展

针对大豆蛋白基胶黏剂的耐水和胶接性能的改性方法,进行了系统性总结,主要有化学改性、物理改性、防霉改性、热压参数对胶黏剂性能影响。同时指出大豆蛋白胶黏剂存在的问题,对其未来相关研究展望。     

增效双乙酸的研制及应用

本文采用一步法合成双乙酸钠,介绍了增效双乙酸钠的复配工艺,同时测试其防霉9效果。     

刨切薄木防霉试验研究

以玉米淀粉胶粘剂胶接旋切单板(如阿尤斯、椴木及高含水率杉木等)制成科技木,经刨切后获得薄木;以杨木单板作为对照样,以青霉、木霉和黑曲霉为试菌,对薄木和对照样进行防霉对比试验。研究结果表明:当玉米淀粉胶粘剂中w(防霉剂)=0.1%或0.3%时,不同薄木(如阿尤斯、椴木及杉木等)对各霉菌(如青霉、木和黑曲霉等)均有良好的防霉效果,其防霉效果大小依次为黑曲霉>青霉>木霉;杉木对霉菌的抑制作用相对最强。     

新型粮食饲料防霉剂双乙酸钠的研制及应用

介绍了双乙酸钠的制备方法，对影响产品收率及质量的诸多因素进行了讨论。叙述了双乙酸钠在粮食、饲料防霉保鲜过程中的应用情况，展望了此产品的国内应用前景。     

双乙酸钠市场前景看好

我国双乙酸钠开发和推广应用起步较晚,目前仅有上海化学试剂总厂、上海化工研究院氮肥所等少数单位生产,年产量不过几百吨。今后几年,随着国民经济的发展,双乙酸钠产品将供不应求,生产开发也将出现一个崭新局面。双乙酸钠在工业领域中主要用作螫合剂、匀化剂、媒染剂和酸味剂等。因其具有防霉防腐、保鲜效果好和营养价值高等多种功效,可用于饮料的防霉保鲜,效果明显优于目前普遍使用的丙酸及其盐类、富马酸二甲酷等。用双乙酸钠作为粮食防霉剂,是发达国家普遍采用的粮食贮存方法。我国是产粮大国,每年都有大量粮食需要贮存保管,用…     

双乙酸钠的应用和市场前景

介绍了双乙酸钠的性质、生产方法、特性及其在食品、粮食和饲料等防霉保鲜过程中的应用情况，并展望了双乙酸钠的市场前景。     

大豆蛋白复合胶黏剂的研究进展

综述了国内外大豆蛋白复合胶黏剂的制备方法,包括大豆蛋白-PF、大豆蛋白-UF胶黏剂和大豆蛋白-丙烯酸酯复合胶黏剂的制备方法,及大豆蛋白复合胶黏剂制备中大豆蛋白表面的改性,着重对目前最常用的硅烷偶联剂和偶氮类化合物两种修饰方法进行了介绍。还介绍了大豆蛋白复合胶黏剂在人造板、造纸等工业领域中的应用,并对复合材料的应用前景进行了展望。     

双乙酸钠饲料防霉剂的研制

介绍了复合型双乙酸钠饲料防霉剂的研制过程。中试产品试用表明，该防霉剂防霉效果好，安全无毒，使用方便。     

多元涂料防霉剂复配协同效应的探讨

在借鉴国外一些成熟产品配方基础上,本文采用二元、三元复配防霉体系对12种霉菌进行了抑菌效果研究,结果发现在维持低成本的前提下,二元复配体系的抗菌效果不是很理想,而三元复配体系的抗菌效果良好。综合M IC实验的结果,选取对各种霉菌抑菌效果较强、成本较低、适合应用于水性涂料的BDY、B03和D05为防霉有效成分。     

双乙酸钠的制备和应用

综述了粮食和饲料新型防霉剂双乙酸钠的制备方法及特点,并介绍了其在相关领域中的应用。     

改性大豆蛋白基胶粘剂耐霉变性能研究

胶合板用大豆蛋白基胶粘剂具有原料来源广、可再生、价格低廉和无甲醛释放等优点,但其仍存在储存时间短、易霉变等缺点。采用单因素试验法探讨了防霉剂种类及含量对大豆蛋白基胶粘剂储存时间和胶合板耐霉变性能的影响。结果表明:当胶液中w(防霉剂C)=1.00%、胶液储存时间为1～14 d时,胶合板经28℃/相对湿度92%霉变处理42 d后,其胶接强度分别为0.85 MPa(比无霉变处理体系降低15%,此时胶液储存1 d)、0.88 MPa(比无霉变处理体系提高42%,此时胶液储存14 d)或变化不大(胶液储存4～10 d),说明含防霉剂C胶液的防霉耐久性相对最好。     

Soy-based adhesive cross-linked by melamine–glyoxal and epoxy resin

To develop a soy-based adhesive with good water resistance, non-toxic melamine–glyoxal resin (MG) prepared in the laboratory was used as a cross-linker of soy-based adhesive. The FT-IR and ESI-MS results showed that there was a reaction between melamine and glyoxal. The resulted –CH–OH– groups could be the possible reactive groups for the cross-linking of soy-based adhesive. The wet shear strength of soy-based plywood indicated that the water resistance of soy adhesive cross-linked by MG improved with respect to that with no cross-linker, although it was not good enough to satisfy the relative standard. With the optimized preparation procedures for plywood, specifically, press temperature 180?°C, press time 3 min and resin loading 280 g m^?2, type I soy-based plywood could be prepared with a hybrid cross-linker, namely 12%MG + 2% epoxy resin (EPR). The DSC results showed that the reaction between soy-based adhesive and the hybrid cross-linker MG + EPR was very complex.     

双乙酸钠的生产技术及应用

介绍了双乙酸钠的生产工艺技术及应用。从生产工艺条件和特点上，对比和分析了5种双乙酸钠的生产方法。认为醋酸-氢氧化钠法为最理想的绿色生产方法，并展望了其应用前景。     

改性豆基蛋白胶粘剂的制备及应用

以改性异氰酸酯作为交联剂,制备改性豆基蛋白胶粘剂。探讨了交联剂、乳化剂和热压工艺条件等因素对该胶粘剂耐水胶接强度的影响。结果表明:当w(交联剂)=6%、u(乳化剂)=1.5%、热压时间为60 s/mm、热压压力为1.0 MPa和热压温度为120℃时,胶合板的耐水胶接强度为1.21 MPa,完全满足GB/T 9846.3—2004标准中Ⅱ类胶合板的使用要求,并且改性生豆基蛋白胶粘剂的适用期超过60 h。     

Bond quality of soy-based phenolic adhesives in southern pine plywood

Increased demand for wood adhesives, environmental concerns, and the uncertainty of continuing availability of petrochemicals have led to recent attention on protein-based adhesives. This study was conducted to investigate the glue bond qualities of soy-based phenolic adhesive resins for southern pine plywood. Two types of soy-based resins were formulated and tested. The first was made by cross-linking soy flour with phenol-formaldehyde (pf) resins at neutral pH. The second type was obtained by cross-linking soy flour hydrolyzates with pf resin under alkaline conditions. Plywood bonded with the neutral phenolic soy resins containing 70% soy flour and 30% 1.6 g/cm² pf without the use of extenders and fillers compared favorably with the traditional southern pine pf glue mixes. Plywood bonded with alkaline phenolic soy resins, containing 40 or 50% 0.5 g/cm² PF with the addition of extender (19% corn-cob powder), provided better adhesive glue bond properties than traditional southern pine pf glue mixes. These results suggest that soy-based phenolic adhesive resins have potential for the production of exterior southern pine plywood.     

Soy-based,tannin-modified plywood adhesives

In this research, two different types of commercial tannins, namely a hydrolysable tannin (chestnut) and a condensed flavonoid tannin (mimosa), were used to prepare two types of soy-based (soy flour (SF) and soy protein isolate) adhesives for making plywood. Thermogravimetric properties (TGA) and its derivative as function of temperature (DTG) of different soy-based adhesive were measured in the range 40°C–300°C. Thermomechanical analysis (TMA) from 25°C to 250°C was done for the different resin formulations. Duplicate three-ply laboratory plywood panels were prepared by adding 300 g/m² of the adhesives’ total resin solid content composed of SF or isolated soy protein (ISP), urea, chestnut, and mimosa tannin extracts with hexamine as hardener. Based on the results obtained, tannins can improve SF adhesion properties. The TMA showed that chestnut tannin extract appeared to react well with SF, while mimosa tannin extract appeared to react well with ISP. Matrix-assisted laser desorption ionization time of flight (MALDI-TOF) mass spectrometry also showed that among other reactions, the soy protein amino acids reacted with the tannins. Furthermore, delamination and shear strength test results showed the good water resistance of plywood bonded with soy-based tannin modified adhesive.     

Soy-based adhesives for wood-bonding – a review

Over recent years, the interest in bio-adhesives, including soy-based adhesives, has increased rapidly. Among natural renewable resources suitable for industrial use, soy is a reasonable choice due to its high production volume and the small use of soy meal-based products for human food consumption. Soy flour can be an ideal raw material for the manufacturing of wood adhesives due to its low cost, high protein content and easy processing. There are also more concentrated forms of soy proteins, i.e. concentrates and isolates, which are also suitable raw materials for adhesive production except that their prices are higher. Extensive research has been carried out on improving the cohesive properties, especially water resistance, of soy-based adhesives. However, there is insufficient experimental data available for understanding the influences of modification methods on the structure of soy proteins and therefore for understanding the influences of structural changes on the adhesion. In this paper, some experimental techniques are proposed to be used for analysing soy-based adhesives to enable better understanding of those factors and improve future development. This review of soy-based adhesives is made with the focus on soy proteins’ chemical composition, soy protein product types (raw materials for adhesive production), modification methods for improving the adhesive properties of soy-based adhesives, and commercial soy-based adhesives.     

Biodegradable hot melt adhesive based on partially saponified polyvinyl acetate/cellulose diacetate blend

Recycling the polymer material from the waste has a great advantage in reducing the cost of the biodegradable hot melt adhesive and solving environmental problems. Cellulose diacetate obtained from the acid hydrolysis of discarded cellulose triacetate-based cinematographic films was blended with low molecular weight partially saponified polyvinyl acetate. The degree of substitution of cellulose diacetate and the degree of saponification of partially saponified polyvinyl acetate to obtain the binary blends having excellent compatibility were determined by FTIR and DSC. TGA showed that these blends have sufficient thermal stability for hot melt adhesive applications. The viscoelastic properties of the blends were evaluated by DMA and melt viscosity. The shear strength and the biodegradability of the final hot melt adhesive were examined according to the amount of cellulose diacetate in the blends. The results indicate that adding 20% of cellulose diacetate can reduce the cost of partially saponified polyvinyl acetate -based hot melt adhesive while improving the adhesive strength.     

Mussel-inspired bio-based water-resistant soy adhesives with low-cost dopamine analogue-modified silkworm silk Fiber

Mussel-inspired dopamine chemistry is popular among engineers for surface modification on various substrates due to its high efficiency, handy operation process, and strong reactivity. However, the high cost of dopamine does not allow for mass production. In the present study, low-cost dopamine analogues (alkali lignin and tannic acid) were used to fabricate high-reactivity silkworm silk fiber (SF) via a simple dip-coating approach, and were then applied to a soy-based adhesive to enhance its performance. The SF tightly combines with soy protein mainly via a Schiff base reaction between polydopamine or dopamine analogue and the amine or thiol groups of soy protein; this forms a multiple crosslinked system and “reinforced concrete”-like structure, as confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetry, and scanning electron microscopy analyses. As expected, the toughness of the soy-based adhesive obviously improved and the highest wet shear strength of the adhesive samples attained 1.50 MPa, which is far greater than relevant interior use requirements. Though dopamine-coated SF could significantly enhance the wet shear strength of the soy-based adhesive by 387.1% compared to the pristine SM adhesive, lignin-coated and tannic acid-coated SFs are more suitable for practical application due to the lower cost of raw materials. The results of this study may represent an effective and low-cost approach to mussel-inspired surface modification chemistry for the mass production of high-performance soy-based adhesives. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48785.