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Comparison of soy-flour hydrolysates for wood adhesive systems

机译:木材粘合剂体系中大豆粉水解物的比较

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摘要

Soy-protein-based adhesives have not been used extensively in wood products since the 1960\u27s because of poor performance, stability, and water-resistance issues compared to petroleum-based adhesives. The early soy-protein adhesives were made from defatted flours and were dispersed in alkaline solutions to denature proteins and make more polar amino acid groups available for adhesion bonding. Recent research has focused on soy flour adhesives due to increased phenol prices and environmental concerns related to the use and exposure to formaldehyde. Soy protein isolates can be modified in highly caustic alkaline solutions to reduce viscosity and improve adhesive properties, but the price of isolates is cost prohibitive for most industry applications. Soy flour hydrolysates produced with enzymes were evaluated in adhesive formulations. Soy hydrolysate and phenol-formaldehyde (PF) resin blends made from four types of enzymatic hydolysates were tested for the time required for polymerization, water-resistance, and their performance in medium-density fiberboard applications. Results show that for all of the aforementioned analyses that as the level of soy hydrolysate increased, properties of hydrolysate-PF blends decreased. Testing also showed distinguishable differences between alkaline and enzymatic hydrolysates, as well as differences among enzymatic treatments when used in resin blends.
机译:自1960年代以来,大豆蛋白基胶粘剂由于与石油基胶粘剂相比性能低,稳定性差和防水性问题而未在木材产品中广泛使用。早期的大豆蛋白粘合剂由脱脂面粉制成,并分散在碱性溶液中使蛋白质变性,并使更多的极性氨基酸基团可用于粘合。由于苯酚价格上涨以及与甲醛的使用和接触有关的环境问题,最近的研究集中在大豆粉粘合剂上。大豆分离蛋白可以在高苛性碱溶液中进行改性,以降低粘度并改善粘合性能,但是分离物的价格对于大多数工业应用而言都是成本过高的。在胶粘剂配方中评估了由酶产生的大豆粉水解产物。测试了由四种类型的酶水解物制成的大豆水解物和苯酚甲醛(PF)树脂共混物的聚合时间,耐水性及其在中密度纤维板应用中的性能。结果表明,对于所有上述分析,随着大豆水解产物含量的增加,水解产物-PF共混物的性能下降。测试还显示了碱性和酶水解产物之间的明显区别,以及用于树脂共混物中时酶处理之间的区别。

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    Schmitz, John F., Jr.;

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  • 年度 2006
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  • 原文格式 PDF
  • 正文语种 en
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