Bonding strength and water resistance of starch-based wood adhesive improved by silica nanoparticles

2011 ◽  
Vol 86 (1) ◽  
pp. 72-76 ◽  
Author(s):  
Zhenjiong Wang ◽  
Zhengbiao Gu ◽  
Yan Hong ◽  
Li Cheng ◽  
Zhaofeng Li
2014 ◽  
Vol 1033-1034 ◽  
pp. 1048-1053 ◽  
Author(s):  
Xin Li Zhang ◽  
Hong Hui Zhang ◽  
Yi Qiang Wu ◽  
Yun Chu Hu

In order to improve the water resistance of silicate wood adhesive, a kind of silicate adhesive was prepared from water glass with silica as curing agent, and ammonium stearate as modifier. The chemical structure, surface morphology and thermal properties of the silicate adhesive were characterized by Fourier transform infrared spectrometer, scanning electron microscope, and thermo-gravimetric analyzer. As the two main measures of adhesion properties, the bonding strength and water resistance were also determined. The results showed that ammonium stearate was successfully introduced into the molecule structure of silicate, the silicate adhesive have good thermal stability in the range of 30~800 °C and the modified silicate adhesive had more smooth cured morphology. The bonding strength and 24h water absorption rate of poplar plywood glued by the silicate adhesive was 0.71 MPa and 22.81%, respectively, reaching the grade II of plywood performance's national standard.


2015 ◽  
Vol 115 ◽  
pp. 32-37 ◽  
Author(s):  
Yanhua Zhang ◽  
Longlong Ding ◽  
Jiyou Gu ◽  
Haiyan Tan ◽  
Libin Zhu

2021 ◽  
Vol 2 (2) ◽  
Author(s):  
Chen-chen Fan ◽  
Qian Tang

This paper aims to develop a modified animal glue sand binder for foundry casting with improved water resistance and bonding strength. An efficient method is reported by using sodium hydroxide as the catalyst to improve the operability of animal glue binder and allyl glycidyl ether as the modifier to improve the water resistance and bonding strength. Sand specimens prepared using allyl glycidyl ether-modified animal glue binder were cured by compressed air at room temperature. The proposed method saves energy and is environmentally friendly and inexpensive. Compared with unmodified animal glue binder, standard dog bone sand specimens with allyl glycidyl ether-modified animal glue binder had higher tensile strength of 2.58 MPa, flowability of 1.95 g, better water resistance (a lower decrease in tensile strength at 25 °C and relative humidity of 60%), and good collapsibility. This allyl glycidyl ether-modified animal glue binder is suitable for practical application in the foundry industry.


Author(s):  
Е.Г. Соколова

В настоящее время к производству плитной продукции и фанеры предъявлены ужесточенные требования, которые регулируются законодательством. Одной из проблем фанерного производства является уменьшение токсичности фанеры повышенной водостойкости до уровня, определяемого современными мировыми требованиями. Снижение содержания свободного формальдегида в фанере можно достичь с помощью применения специализированных связующих, модифицированных меламином. Использование меламина признано перспективным направлением развития современного фанерного производства. Изложены результаты исследования меламинокарбамидноформальдегидных смол с со- держанием меламина от 20 до 25%, а также результаты исследования влияния содержания меламина в меламинокарбамидноформальдегидной смоле на проч- ность и токсичность фанеры, изготовленной с применением этих смол. Даль- нейшие исследования направлены на совершенствование эксплуатационных свойств (прочность склеивания и токсичность продукции) и технологии фанеры повышенной водостойкости с применением МКФС с содержанием меламина 20%. Одним из эффективных способов повышения прочности клеевого соедине- ния и снижения токсичности фанеры является применение аэросила технического в качестве модификатора для синтетических смол. Разработан рациональный состав клея на основе меламинокарбамидоформальдегидной смолы для склеива- ния шпона. Приведены технологические параметры склеивания фанеры, изго- товленной с применением меламинокарбамидноформальдегидных смол, показатели ее прочности и токсичности. Currently, tightened requirements to production of particleboard and plywood products are presented which are regulated by law. One of the problems in plywood production is the reduction of the toxicity of plywood increased water resistance to the level determined by the modern world requirements. The decrease in the content of free formaldehyde in the plywood can be achieved through the use of special binders modified with melamine. The use of melamine is recognized as a promising direction of development of modern plywood production. The research results of melamine-carbamide-formaldehyde resins containing melamine from 20 to 25% and also results of research of influence of melamine in the melamine-carbamide-formaldehyde resin strength and current-sicnosti plywood, manufactured using these resins. Further research aimed at improving the operational properties (bonding strength and toxicity of products) and technologies of plywood increased water resistance with the use of MKFS resins containing 20% of melamine. One effective way of increasing the bonding strength and reduce the toxicity of the plywood is the use of Aerosil technical as a modifier for synthetic resins. Developed rational adhesive composition based on melamineformaldehyde resin for bonding veneers. The technological parameters of the bonding of plywood, manufactured melamine-carbamide-formaldehyde resins, indicators of its strength and toxicity.


BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 5546-5557
Author(s):  
Nairong Chen ◽  
Jian Huang ◽  
Kaichang Li

A new formaldehyde-free wood adhesive, primarily composed of defatted cottonseed flour (CF) and polyamine-epichlorohydrin (K736) resin, was investigated for the preparation of interior plywood. Sodium hydroxide was an essential component of the adhesive. The effects of pH values of the CF-K736 adhesive, the CF/K736 weight ratio on the pot life of the adhesive, and the water resistance of the resulting plywood panels were investigated in detail. The hot-pressing temperature and time were optimized in terms of the water resistance of the resulting plywood panels. The resulting 5-ply plywood panels met the industrial water resistance requirements for interior application under the following conditions: pH > 11, CF/K736 weight ratio in the range of 8/1 to 5/1, hot-press temperature ≥ 120 °C, and hot-pressing time > 4 min. The pot life of the adhesive was approximately 3 h when the pH was 12 and the CF/K736 weight ratio was 8/1. The curing mechanism of the adhesive is discussed.


2014 ◽  
Vol 884-885 ◽  
pp. 108-111 ◽  
Author(s):  
Chun Nan Jin ◽  
Shi Cheng Zhang ◽  
Jiu Yin Pang ◽  
Zhen Guo Gao

This paper is mainly aimed at the problem of low bonding strength of soy bean protein adhesive,poor water resistance,with methyl methacrylate and vinyl acetate composite study made with rubber manufacturing class II plywood,meet the national standard,so as to solve the water resistance of soy protein adhesives and bonding strength of.Experiments that 3.5g soy protein, 5g PVA, 30g MMA, 0.3g APS and 100g water, modified soy protein adhesive bonding strength obtained is excellent, and cost reduction.Preparation of soybean protein-acrylate adhesive solid content,viscosity and strength of plywood detection.


2016 ◽  
Vol 46 (5) ◽  
pp. 1193-1211 ◽  
Author(s):  
Simona Jevšnik ◽  
Selin Hanife Eryürük ◽  
Fatma Kalaoğlu ◽  
Burçak Karagüzel Kayaoğlu ◽  
Petra Komarkova ◽  
...  

This study examined the effects of ultrasonic welding parameters on bond strength, seam thickness and seam stiffness, as well as water permeability. For study purpose, two types of four-layered fabrics with same compositions and different areal densities suitable for inner part of sport shoes were used. Two different types of seams, lapped and superimposed, were applied for ultrasonic welding and also compared by traditional seam applied by shoe manufacturer. The morphology of different type of seams was also analyzed to observe the influence of welding parameters on the layers during the ultrasonic welding process. Bonding strength was found to depend on the seam type and composition of the joined fabric layers. It was confirmed by the shoe manufacturer that all the produced welded seams provided the requested minimum bond strength to be suitable for the use of the shoes. The traditional seams applied by the shoe manufacturer were thicker but had lower stiffness in comparison to all welded seams. It was also found out that ultrasonic welding damaged the membrane, which was confirmed by no water resistance of welded seams. Statistical analysis showed that ultrasonic welding parameters, such as welding frequency and velocity, influence the bond strength, thickness, and bending stiffness of welded seams, but the obtained results were statistically insignificant.


2000 ◽  
Vol 29 (3) ◽  
pp. 152-158 ◽  
Author(s):  
Lijun Qiao ◽  
Allan J. Easteal ◽  
Clive J. Bolt ◽  
Philip K. Coveny ◽  
Robert A. Franich

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