摘要:In this study, graft copolymer tetrakis hydroxymethyl-2-methyl-l-propyl sulfonate and phosphorylamide ethylene(HPSA) was synthesized by 2-acrylamido-2-methyl-l-propanesulfonic acid(AMPS) and tetramethylolpropane chloride(THPC). HPSA was grafted in synthesizing of urea formaldehyde(UF) resin with low F/U molar ratio. Fourier transform infrared spectroscopy(FTIR) and thermal gravimetric analysis(TGA) results showed that the grafted HPSA-UF was successfully synthesized. Differential scanning calorimetry(DSC) analysis also indicated that the grafted HPSA-UF was easier to cure. Particleboard samples were made with the control UF, grafted HPSA-UF and mixed HPSA/UF resin, respectively, and properties of the samples were evaluated and compared. The particleboard made with grafted HPSA-UF resin showed the best performance like oxygen index, modulus of rupture as well as internal bond strength(IB) with the lowest formaldehyde emissions.
摘要:Effects of the modulus of elasticity(MOE), layer numbers, thickness of timber and assembly directions on interlamination shear properties of cross-laminated timber(CLT) made from domestic Japanese larch in China were analyzed.The results showed that there was no significant effect on interlamination shear modulus but significant effect on interlamination shear strength of the CLT with increased MOE as well as decreased layer numbers and thickness of timber. The interlamination shear properties were significantly improved by changing timber assembles directions. The effective shear stiffness could be used to predict by the shear analogy method with less than 7% relative error between predicted and measured values.
关键词:domestic Japanese larch;CLT;interlamination shear properties;theoretical calculation
摘要:In order to improve mold resistance and dimensional stability of bamboo and bamboo products,Moso bamboo samples were treated with a compound plasticizer containing low molecular weight unsaturated acid and ester by a vacuum-pressure impregnation process. Weight percent gain(WPG),dimensional stability, mechanical performance and mold resistances of the samples were then tested.The results showed that average WPG was 25.6%; the dimensional stability and compression strength parallel to the grain improved and mold and stain fungi resistance nearly reached 100%.
摘要:Research and development process and production status of high-performance wood scrimber was reviewed in this paper. Main direction and hot points for further research and development as well as industrialization of high-performance wood scrimber was proposed in detail.
摘要:The authors summarized the development of the furniture and customized home furnishings industry in China. The situation of the industry chain was analyzed and a framework model was established. The impacts of customized home furnishings on chain structure, sales and services, and core competitiveness were discussed. Internet thinking and "Multi-user" concept were proposed including digital transformation strategy, development from custom to factory, panel production factory or equipment factory as the core. Suggestions on further development of the customized home furnishings industry were provided.
摘要:The authors summazized the latest technologies developed by themselves for making reconstituted decorative lumber, including end sealing for logs and reconstituted decorative lumber, veneer bleaching and dyeing, automatic pH value adjusting system during veneer bleaching, horizontal dying sink,formaldehyde-free adhesives application and high-frequency bonding processes. Further development of high performance reconstituted decorative lumber/veneer like high color fastness, flame retardancy and painting-free products was also presented.
关键词:reconstituted decorative lumber;end sealing;bleaching and dyeing;high frequency bonding
摘要:By collecting and analyzing global patent literatures on drying technology of woody materials and consulting with certain experts, the authors discussed the status quo of the patents related to woody material drying from the point of view of overall trends, geographical distribution, active applicants,technology classifications and key patents. Domestic and foreign patenting activities were also compared.Suggestions were proposed to provide references for R & D in the future.
摘要:The status of panel-furniture machinery, solid-wood-furniture machinery, wooden door machinery and coating machinery in China were presented. Suggestions for further development of woodworking machineries in China were proposed.
摘要:The authors analyzed the current situation of Chinese ethnic traditional wood structural buildings in Qiandongnan Miao and Dong Autonomous Prefecture of Guizhou Province. On the basis of traditional ethnic culture and architectural conservation, they proposed to upgrade and renovate the buildings by improving their function and living conditions. Furthermore, they were able to control construction costs by using new wood materials and new wood processing technologies during construction and by industrializing wood structure production.
关键词:ethnic;tradition;wood structure building;renovation;Qiandongnan Miao and Dong Autonomous Prefecture
摘要:Veneer and medium density fiberboard(MDF) samples were glued together with EVA and APAO hot melt adhesives. The effect that adhesive layer temperature in the samples had on bonding strength was evaluated.The results showed that adhesive layer temperature had significant influence on bonding strength and the temperature resistant performance of the APAO was better than that of the EVA. When the adhesive layer temperature of the EVA and APAO was lowered under 41 ℃ and 47 ℃, respectively, the both samples could be strong enough for follow-up processing. This study result could be used in splicing processing of timber framework on-line manufacturing and wood edge banding automation applications.
关键词:adhesive layer temperature;hot melt adhesive;bonding strength;veneer;Medium density fiberboard(MDF)
摘要:To develop sustainable structural insulated materials, bamboo fiber/polypropylene thermal insulation composites, with different densities, were prepared and feasibility of the composites to be used as core materials in structural insulated panels(SIPs) were studied.The results showed that mechanical properties of the composites increased with increasing density while insulation properties first increased and then decreased. Taking into consideration of insulation and mechanical properties of the composites, it was concluded that the composite with 0.20 g/cm3 of density was suitable for replacing polystyrene foams as core materials of SIPs.