大豆蛋白胶竹材胶合板制作工艺的研究

以大豆蛋白胶为竹材胶合板的无甲醛胶黏剂,研究了胶合板的热压工艺。结果表明,大豆蛋白胶的竹材胶合板的最佳热压工艺参数:热压时间50 min,热压压力17 MPa,热压温度140℃,施胶量400 g/m2。在此条件下,胶合板在胶合强度和耐水性方面均高于国家标准Ⅱ类胶合板要求。     

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。     

改性花生蛋白基黏合剂用于杨木胶合板热压工艺的研究

通过单因素试验,对改性花生蛋白黏合剂所适用的杨木胶合板最佳热压工艺条件进行探究。着重考察了热压压力、热压时间、热压温度和涂胶量对胶合板湿态胶合强度的影响,并利用正交试验进行工艺优化。研究结果表明:最佳热压工艺为热压压力0.6 MPa、热压时间600 s、热压温度100℃和涂胶量210 g/m~2。利用该工艺制备的胶合板湿态胶合强度达到1.39 MPa,满足国家Ⅱ类胶合板的要求(0.70 MPa)。     

改性大豆蛋白胶膜纸饰面细木工板的浸渍剥离性能研究

采用杉木芯板和桉木单板为原料,以热压温度、热压时间、桉木单板含水率为影响因素设置单因素和正交试验,并通过检测板坯的浸渍剥离长度,对改性大豆蛋白基胶粘剂浸渍膜纸饰面细木工板的热压工艺进行了研究。研究结果表明:各因素对板坯浸渍剥离性能影响的主次为热压温度桉木单板含水率热压时间;当杉木板芯厚度为12 mm、桉木单板厚度为3 mm、单面施胶量为250 g/m2、热压压力为0.8 MPa时,较优的热压工艺参数为热压温度120℃、热压时间520 s、桉木单板含水率为12%。     

大豆蛋白胶麻杆刨花板制备工艺的研究

为了开发环境友好型刨花板,探讨利用大豆蛋白胶黏剂压制麻杆刨花板的制备工艺,分析热压温度、热压时间、施胶量和密度对麻杆刨花板性能的影响。结果表明,大豆蛋白胶可以用于麻杆刨花板的制造,其最佳工艺参数为:热压温度180℃,热压时间25 min,施胶量18%,密度0.80 g/cm3。在此条件下,压制的板材的性能超过GB/T 4897.4—2003的要求。     

豆基蛋白质胶粘剂改性及应用研究

为了降低豆基蛋白质胶粘剂的黏度、提高胶合板的耐沸水胶接强度和满足工业化的生产要求,对传统豆基蛋白质胶粘剂进行改性,并通过胶粘剂的黏度、pH值、凝胶时间、耐沸水胶接强度以及热分析结果等确定了改性剂的合理用量。然后以热压温度、热压时间、热压压力和涂胶量作为试验因素,以胶接强度作为考核指标,采用正交试验法优选出制备胶合板用改性豆基蛋白质胶粘剂的较佳工艺条件。结果表明:改性剂的合理用量(质量分数)是40%;胶合板的较佳热压工艺参数是热压温度140℃,热压时间5 min,热压压力1.2 MPa,双面涂胶量310 g/m2;在此较佳热压工艺条件下制备的胶合板,其耐沸水胶接强度较理想(为1.12 MPa),并且满足Ⅰ类胶合板的标准要求。     

聚乙烯醇改性大豆蛋白胶粘剂的制备与性能研究

以12%PVA(聚乙烯醇)溶液为共混改性剂,制备了胶合板用改性大豆蛋白胶粘剂。着重探讨了PVA溶液用量、热压温度和热压时间对胶合板粘接性能的影响,并对该胶粘剂的结构进行了表征。研究结果表明:随着PVA溶液用量的增加,胶粘剂的黏度增大,但胶合板的粘接强度呈先降后升态势;当w(PVA)=80%(相对于大豆蛋白胶粘剂质量而言)、热压温度为130℃和热压时间为15 min时,胶合板的粘接性能相对最好;PVA和纯大豆蛋白之间存在较强的氢键作用,这是提升改性大豆蛋白胶粘剂粘接强度的主要原因。     

苯酚改性豆基蛋白胶黏剂的制备及胶接强度的研究

通过对大豆粉采用碱处理使大豆蛋白质大分子结构展开,暴露出的官能团进一步与甲醛反应生成稳定的蛋白质,这种物质与苯酚共聚反应生成改性豆基蛋白胶黏剂。采用单因素实验方法,探讨了改性豆基蛋白胶黏剂压制杨木三层胶合板的胶合工艺。分析了热压温度、热压时间和涂胶量对胶合板胶合性能的影响。结果表明：采用改性后的豆基蛋白胶黏剂,在压力为1．4MPa,温度为165℃左右,热压时间为1．4～1．6min·mm^-1,涂胶量为220g·m^-2,压制的杨木胶合板胶合性能较佳且达到Ⅰ类胶合板的标准。     

MUF共缩聚树脂生产杨木胶合板影响因素分析

利用MUF共缩聚树脂制备杨木胶合板,对影响胶合板的热压工艺要素、胶粘剂黏度、陈放方式和不同陈放时间进行了优化和分析。结果表明,热压工艺3要素中,对杨木胶合板胶合强度的影响主次顺序为:热压温度热压时间热压压力;在杨木胶合板制备时,通过添加不同含量的淀粉,调节胶粘剂黏度,发现当淀粉添加量为胶粘剂用量的11%~15%时,胶合板胶接强度显著提高;通过对施胶后的单板进行陈放处理,结果发现无论是开口陈放还是闭口陈放,均可提高胶接强度,同时综合考虑陈放方式和陈放时间发现,以闭合陈放3 min时,胶接强度效果最佳。     

改性大豆分离蛋白/淀粉降解材料研究

对大豆蛋白和淀粉进行辐(照辐照剂量20 kGy)处理,制备了大豆蛋白/淀粉生物降解材料,研究了热压温度、时间、压力对大豆蛋白/淀粉降解材料力学性能、透光率、吸水率的影响,并利用FTIR对其进行分析。结果表明:热压温度130℃、时间15 min、压力15 MPa时,所制备材料的断裂伸长率为377.4%、拉伸强度为7.21 MPa透、光率为28.5%吸、水率为46.26%。     

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.     

基于膨润土的脲醛树脂填料的开发与性能研究

比较了面粉、膨润土及其用量对脲醛(UF)树脂胶粘剂的pH值、固含量、固化时间和胶合强度的影响,探讨了膨润土用作胶粘剂填料的可行性。研究结果表明:随着膨润土用量的增加,UF树脂胶粘剂的pH值、固化时间和固含量呈递增趋势,游离甲醛含量明显下降;随着面粉用量的增加,UF树脂胶粘剂的固含量和固化时间呈递增趋势(但增幅比膨润土体系小),pH值有所降低;用添加膨润土的UF树脂胶粘剂生产的胶合板,当w(膨润土)≤20%、施胶量为280～300 g/m2时,胶合板的湿态胶合强度(1.69 MPa)比面粉体系(1.53 MPa)和纯UF树脂胶粘剂体系(1.09 MPa)的高,其湿态胶合强度能达到GB 9 846-1988的标准,而干态胶合强度则远高于GB 9 846-1988标准。     

Soybean meal-based adhesive enhanced by MUF resin

Soybean meal flour, polyethylene glycol (PEG), sodium hydroxide (NaOH), and a melamine-urea-formaldehyde (MUF) resin were used to formulate soybean meal/MUF resin adhesive. Effects of the adhesive components on the water resistance and formaldehyde emission were measured on three-ply plywood. The viscosity and solid content of the different adhesive formulations were measured. The functional groups of the cured adhesives were evaluated. The results showed that the wet shear strength of plywood bonded by soybean meal/NaOH adhesive increased by 33% to 0.61 MPa after adding NaOH into the adhesive formulation. Addition of PEG reduced the viscosity of the soybean meal/NaOH/PEG adhesive by 91% to 34,489 cP. By using the MUF resin, the solid content of the soybean meal/MUF resin adhesive was improved to 39.2%, the viscosity of the adhesive was further reduced by 37% to 21,727 cP, and the wet shear strength of plywood bonded by the adhesive was increased to 0.95 MPa, which met the interior plywood requirements (≥0.7 MPa). The formaldehyde emission of plywood bonded by the soybean meal/MUF resin adhesive was obtained at 0.28 mg/L, which met the strictest requirement of the China National Standard (≤0.5 mg/L). FTIR showed using the MUF resin formed more  CH₂ group in the cured adhesive. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Adhesive qualities of soybean protein-based foamed plywood glues

The potential of soy protein-based plywood glues for foam extrusion was evaluated. Standard glue mixes containing the soy flours Honeysoy 90, ISU-CCUR, Nutrisoy 7B, and defatted Soyafluff, and the soy concentrates Arcon F and Procon 2000 showed excellent foaming and adhesive qualities but did not have the ability to refoam. To improve refoaming capability, the formulations were modified by increasing the quantities of soy flour or concentrate so that they provided 3.48 g protein/100 g of glue mix. This was the amount of protein contributed by animal blood when it was used as the extender in the standard formulation for foamed glue. All the modified glues containing soy flour or concentrate had good refoaming properties and adhesive strengths that were at least equal to that of the control glue. Simple cost analysis also indicated that when soy flour was used, the modified formulations were cheaper to produce than the current blood-based glue.     

Improvements and limitation of soy protein-based adhesive: A review

Soy protein is known for its eco-friendly, sustainable, and biodegradable qualities that are likely used as raw material in producing bioadhesive. However, soy protein-based adhesive are lacking in terms of adhesive strength and water-resistance compared to commercial formaldehyde-based adhesives such as phenol and urea-formaldehyde resin. Therefore, continuous research has been done to improve adhesive performance. This can be done via physical or modification methods, including the usage of cross-linking agents, structural modification, enzymatic modification, and the addition of additives. This review will cover these modification methods that give significant enhancement to the water-resistance and adhesive strength of soy protein-based adhesives.