木材工业用胶黏剂低毒化研究进展

从合成树脂型胶黏剂的改进和生物质胶黏剂开发利用两方面,总结了木材工业用胶黏剂的低毒化研究进展,并提出根据我国国情着力发展生物质胶黏剂的建议。     

胶黏剂发明专利

一种以大豆分离蛋白为基料的粉末生物胶黏剂,木质用耐水胶黏剂组合物,人造板用无醛胶黏剂,一种由木材液化物合成的酚醛树脂胶黏剂、其制备方法及其应用,一种环保型木材工业用胶黏剂,低碱量豆粉胶黏剂……     

胶黏剂发明专利

一种以大豆分离蛋白为基料的粉末生物胶黏剂,木质用耐水胶黏剂组合物,人造板用无醛胶黏剂,一种由木材液化物合成的酚醛树脂胶黏剂、其制备方法及其应用,一种环保型木材工业用胶黏剂,低碱量豆粉胶黏剂……     

木材工业胶黏剂的现状与未来

介绍了我国木材工业胶黏剂的应用概况,分析了国内外木材工业胶黏剂的研究进展,总结了木材工业胶黏剂的发展趋势,并针对我国木材工业胶黏剂发展过程中的主要问题,提出建议。     

木材胶黏剂和涂料市场新趋势

<正>1木材胶黏剂2030年全球木材胶黏剂市场规模将超过123.756亿美元（约人民币833.8亿元）,2022—2030年期间,预测年复合增长率为6.57%。由于全球消费者环保意识提高,水溶性木材胶黏剂（非溶剂型木材胶黏剂）使用增多。与溶剂型木材胶黏剂的制品相比,     

胶黏剂发明专利

用聚乙烯及其他热塑性塑料做无甲醛胶黏剂生产胶合板、细木工板（大芯板）,液化木酚醛胶黏剂的制备方法,木材胶黏剂的复合添加剂,阳离子支链淀粉木材胶黏剂及制备方法,生物质基无甲醛室内用的人造板木材胶黏剂及其制备方法……     

胶黏剂发明专利

用聚乙烯及其他热塑性塑料做无甲醛胶黏剂生产胶合板、细木工板（大芯板）,液化木酚醛胶黏剂的制备方法,木材胶黏剂的复合添加剂,阳离子支链淀粉木材胶黏剂及制备方法,生物质基无甲醛室内用的人造板木材胶黏剂及其制备方法……     

生物质基和非甲醛类木材胶黏剂

目前,木材加工业所使用的胶黏剂主要是甲醛类合成树脂胶黏剂,着眼于环保和木材加工用胶黏剂的可持续发展问题,本文阐述了生物质基木材胶黏剂和非甲醛类木材胶黏剂的开发研究和生产应用,以及存在和需要继续解决的技术瓶颈问题。     

胶黏剂发明专利

一种大豆蛋白接枝共聚乳液胶黏剂及其制备方法和应用；一种木材胶黏剂及其制备方法；高性能天然无毒木材胶黏剂及其制配方法     

木材用植物蛋白胶黏剂蛋白质改性与性能改善研究进展

木材用植物蛋白胶黏剂是以生物质资源——饼粕蛋白为主要原料,以水为分散介质制成的新型绿色环保胶黏剂。对木材用植物蛋白胶黏剂的蛋白质改性方法、应用性能改善方法以及应用进行综述,同时指出目前该研究领域存在的问题,旨在展望未来的研究重点,为植物蛋白胶黏剂在木材中的进一步开发利用提供参考。     

Novel adhesive system based on 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU) and hyperbranched polyglycerols

Two hyperbranched polyglycerols bearing 1,1,1-tris(hydroxymethyl)propane or Bisphenol A core and terminal hydroxyl functionality were examined as components of novel wood adhesive systems. Two 1,3-dimethylol-4,5-dihydroxyethyleneurea resins (DMDHEU) were used as crosslinkers. Shear strength tests revealed that the adhesives containing up to 75 wt% of renewable glycerol-derived polyglycerols retained performance comparable to that of neat DMDHEU. The results give way to extending the area of application of hyperbranched polyglycerols in the field of wood adhesives.     

Development and optimization of a new formaldehyde-free cornstarch and tannin wood adhesive

The development and optimization of a new, environment-friendly adhesive made from abundant and renewable cornstarch and tannin is described in this study. At present, the production of wood composites mainly relies on petrochemical- and formaldehyde-based adhesives such as phenol-formaldehyde (PF) resins and urea-formaldehyde (UF) resins. Formaldehyde-free cornstarch plus tannin adhesives were evaluated for mechanical and physical properties (shear strength, rheological characterisation and thermogravimetric analysis). First, optimized conditions for the preparation of cornstarch-sodium hydroxide wood adhesives were determined. The parameters studied were the following: total solids content of the adhesives, sodium hydroxide concentration and sodium hydroxide/cornstarch volume ratio. The highest shear strength results appeared to be 0.5 sodium hydroxide/cornstarch volume ratio when using concentrations of cornstarch (65% p/v H₂O) and sodium hydroxide (33% p/v H₂O). The optimum cure temperature was 170 °C and the cure time 4 min. The addition of two types of tannin-based adhesives, Mimosa and Quebracho, with hexamethylenetetramine (hexamine) hardener to the cornstarch-sodium hydroxide formulation improved the shear strength and decreased the viscosity of adhesives.     

Comparison of thermal expansion of wood and epoxy adhesives

and Iroko, Clorophora excelsa) and four different epoxy resins have been compared using a modified test method that allows for nearly iso-hygric conditions of the wood specimens. Minor differences in TEC have been observed between wood in the transversal-to-the-grain direction and an experimental epoxy adhesive, which is considered highly compatible with wood on the basis of mechanical and ageing tests. Other commercial epoxy adhesives show greater differences in terms of TEC and a proportionally decreasing mechanical compatibility. According to these results, the evaluation of thermal properties can be considered very useful for a modelling approach to predict the long term behaviour of wood-epoxy adhesive interface.     

我国传统木工胶粘剂的研究进展与发展趋势

介绍了木工用胶粘剂发展的历史和研究现状及改性方法,重点是综合了传统木工用三种甲醛类胶粘剂和人造板二次加工及家具生产用聚乙酸乙烯酯乳液胶的研究进展,同时提出了木工胶粘剂的发展趋势。     

植物油料蛋白木材胶黏剂改性的研究进展

植物油料蛋白胶黏剂具有来源广泛、无毒、可再生及制备简单等优点,但胶接强度低、耐水性能差、易霉变等问题限制了其发展和应用。综述了近年来几种主要植物油料蛋白胶黏剂如大豆蛋白胶黏剂、花生蛋白胶黏剂、棉籽蛋白胶黏剂等在木材行业的研究和应用现状,重点阐述了提高植物油料蛋白胶黏剂耐水性能的改性方法,包括物理改性、变性剂改性、接枝改性、交联改性、仿生改性、酶改性、纳米材料改性、复合改性等,指出了植物油料蛋白胶黏剂存在的问题,并对未来发展方向和应用前景进行了展望。     

再识木材胶粘剂

近几十年,以再生资源为原料的胶粘剂逐步被以化石资源为主体的胶粘剂所取代。然而,由于后者在生产与使用中对环保的负面影响,如今以再生资源为原料的胶粘剂如大豆蛋白胶等又被重新重视,国外已再度开展对大豆蛋白胶的研究应用。以生命周期分析木材胶粘剂,既要应用胶粘剂增强木材,又要减少其造成的污染。     

Tannin–resorcinol–aldehyde cold-set wood adhesives with only formaldehyde as hardener

Based on standard tannin adhesive formulations, tannin-resorcinol-glyoxal and tannin-resorcinol-glutaraldehyde cold-setting adhesives were prepared for wood glulam in this paper. Only less para-formaldehyde was added as hardener of adhesives. Both of them showed a rival tensile strength with tannin-resorcinol–formaldehyde adhesive. However they exhibited lower wood failure. The proportion of formaldehyde of the two are drastically decreased.     

Potential of tannin extracts as resorcinol replacements in cold cure thermoset adhesives

Blends of phenol resorcinol formaldehyde (PRF) resin with tannin obtained from bark offers the potential to minimise the quantity of resorcinol required in conventional two pot, cold set PRF wood adhesives. In the presence of ammonia, both quebracho and radiata pine bark extracts, resorcinolic and phloroglucinolic type tannins respectively, showed accelerated adhesive cure behaviour with formaldehyde, in a similar manner to PRF adhesive Greenweld technology for modifying glued timber processing rates. Segregation of pine bark components established that only tannin-containing fractions exhibited accelerated adhesive cure behaviour. Results from adhesive testing indicated adhesive blends of quebracho extract and PRF resin failed to attain satisfactory bond strength at full cure. Of the pine bark components, only a pure tannin fraction produced acceptable bond strength when blended with PRF (3:1). The study indicated pine bark extract can be substituted into PRF adhesives and adhesive cure rate accelerated using ammonia. However, extracts containing crude tannin or carbohydrate materials in adhesive blends led to inferior adhesives.     

Bonding performance of heat treated wood with structural adhesives

Bonding of untreated, intermediate (hydro-thermolysed) and heat treated wood with melamine-urea-formaldehyde (MUF), phenol-resorcinol-formaldehyde (PRF) and polyurethane (PUR) adhesives was studied. An industrial heat treatment process (Plato ^®) was used, which included two separate heat treatment stages and a drying stage in-between. Laminated beams having four lamellas were prepared from untreated and treated timber for mechanical testing of the bond lines. The results of the tests showed that heat treatment affected the shear strength and the delamination of the laminated wood depending on the adhesive system used for bonding. The PUR and MUF adhesives performed in a rather similar way, and better than the PRF adhesive. The shear strength of laminated wood bonded with the waterborne MUF and PRF adhesives decreased for the specimens made of hydro-thermolysed timber and decreased further for the specimens made of fully heat treated timber. The difference in adhesive bond shear strength between untreated, intermediate and fully treated wood was less obvious in the case of the PUR adhesive. Delamination of the PRF bond line decreased drastically for all the specimens made of heat treated timber.     

Lignin-based cold setting wood adhesives structural fingerjoints and glulam

A traditional-type cold-setting wood adhesive as well as separate applications fast-set wood adhesives for exterior-grade structural fingerjoints and glulam based on soda bagasse lignin were developed and tested. Their results satisfy the requirements of the relevant international specifications. The soda bagasse lignin used composed approximately 75% of the total adhesive solids while resorcinol content as low as 13.6% on liquid resin was used, with good results. On top of their novelty and of their excellent performance these adhesives appear to be economically very attractive.