Effects of polyethylene glycol on the flexibility of cold-setting melamine–urea–formaldehyde resin

Zhang, Bengang; Wu, Zhigang; Liang, Jiankun; Xi, Xuedong; Lei, Hong; Du, Guanben

doi:10.1007/s00107-022-01801-x

Cited by 9 publications

(3 citation statements)

References 15 publications

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“…MUF resin was coated on the glued wood on one side with a resin content of 160 g/m 2 , followed by hot pressing under a pressing temperature of 150 • C, pressing time of 10 min, and pressing pressure of 2.0 MPa. The prepared glued wood was placed in the laboratory at a temperature of 20 ± 2 • C and relative humidity of 65% ± 5% for 3 days, and then the shear bonding strength and peeling rate were tested by reference to [33,34]. The final value was the average of 12 specimens.…”

Section: Preparation and Performance Test Of Glued-woodmentioning

confidence: 99%

Effects of Plasma Treatment on the Surface Characteristics and Bonding Performance of Pinus massoniana Wood

Liang

et al. 2023

Forests

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Rosin has a great influence on the bonding of Pinus massoniana wood, and surface modification is an important way to solve this problem. In this study, Pinus massoniana wood was treated by plasma, and the effects of plasma treatment on the bonding performance and surface characteristics were investigated. The results showed the following: (1) After plasma treatment, the contact angle of Pinus massoniana wood was significantly reduced and the surface energy was significantly increased from 28.42 × 10−7 to 74.75 × 10−7 J·cm−2, and the surface wettability was also greatly improved. (2) Plasma high-energy particles experience simultaneous physical and chemical effects on the surface of Pinus massoniana wood. The former formed a micro-etched roughness on the wood surface and led to the increase in surface dispersion force, while the latter increased the aggregation and activity of polar groups on the wood surface and the degradation of some wood components and rosin, resulting in the increase in surface polar force and the enhancement of wettability. (3) After plasma treatment, the reactivity of wood was enhanced, and the cross-linking degree with adhesive and the heat release were increased. The bonding strength of Pinus massoniana wood could be improved: dry bonding from 5.08 to 5.38 MPa, boiling-water bonding strength from 4.12 to 4.53 MPa, cold-water bonding strength from 3.84 to 4.51 MPa, and the bonding stability and reliability of glued specimens were also improved.

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Section: Preparation and Performance Test Of Glued-woodmentioning

confidence: 99%

Effects of Plasma Treatment on the Surface Characteristics and Bonding Performance of Pinus massoniana Wood

Liang

et al. 2023

Forests

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“…Pinus massoniana and Cunninghamia lanceolata are widely planted, and they have the characteristics of fast growth, high economic benefit, and strong regeneration ability. Houses built with Pinus massoniana and Cunninghamia lanceolata can be seen throughout Southern China (Wang et al 2019;Yu et al 2020;Wu et al 2021;Wang et al 2022;Zhang et al 2022a;Zhang et al 2023a). As an important connection mode of wood structure, nail connection is more compact and tougher than mortise-tenon connection, and it is convenient and fast to construct, safe, and reliable, thus becoming the most commonly used connection in wood structures (Tian and Xu 2019;Liu et al 2020;Zheng et al 2022;Berwartet al 2022;Xia et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Comparison of nail-holding performance of Pinus massoniana and Cunninghamia lanceolata dimension lumber based on round steel nails

Li,

Yu,

et al. 2023

BioRes

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In this study, the influence of the diameter of round steel nails, the guiding bores, and the wood sections on the nail holding performance of Pinus massoniana and Cunninghamia lanceolata dimension lumber was explored. The results showed that the nail-holding power of round steel nails mainly came from their friction with wood fibers, while the radial and tangential sections were also affected by the shearing action of wood fibers. The tangential section reached the largest nail-holding power, followed by the radial section and cross section. Greater wood density was associated with higher nail holding power. Under a large nail diameter, however, high-density wood was prone to plastic cracking, which influenced the nail holding power greatly. Prefabricated guiding bores could prevent plastic cracking in wood to some extent and improve the nail holding power of Pinus massoniana and Cunninghamia lanceolata dimension lumber when diameter of round steel nails was more than 3.0 mm. For Cunninghamia lanceolata characterized by low density and rigidity, the wood fiber was in close contact with the round steel nail and internal cracking could not be easily generated under a large diameter of round steel nails.

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“…The adhesives used in the wood-based panel industry are predominantly formaldehydebased adhesives, with the usage amount accounting for 60-70% or higher of the total adhesive usage [1][2][3][4]. Formaldehyde-based adhesives have a very prominent social and environmental disadvantage, namely, formaldehyde is released during adhesive preparation and use as well as the preparation of wood-based panels made with such adhesives, thus endangering the environment and human health [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Fully Bio-Based Adhesive from Tannin and Sucrose for Plywood Manufacturing with High Performances

Xiao

Liang

et al. 2022

Materials

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Fully bio-based adhesives are beneficial to reduce the dependence of the wood adhesive industry on synthetic resins based on petrochemical resources and enhance the market competitiveness of adhesives. A fully bio-based wood adhesive composed of tannin and sucrose was developed and successfully used in the preparation of plywood. Effects of the preparation technology on the bonding strength and water resistance of plywood were investigated, and the properties of the adhesive were analyzed by Fourier transform infrared spectroscopy (FT-IR), thermogravimetry (TG) and X-ray diffraction (XRD) in this study. The results showed that: (1) Compared with other biomass adhesives, tannin–sucrose adhesive had the characteristics of high-solid content and low viscosity, which had the potential to prepare particleboard and fiberboard. (2) A proper mass ratio of tannin to sucrose was key to obtaining a tannin–sucrose adhesive with better properties. (3) The optimum preparation process of tannin–sucrose adhesive for plywood was as follows: hot-pressing temperature of 210 °C, hot-pressing time of 1.2 min/mm, m(tannin):m(sucrose) of 60:40 and adhesive loading of 160 g/m2. Under these conditions, the water-resistant bonding strength of the plywood was 0.89 MPa, which met the strength requirements of the Type II standard of plywood in GB/T 17657-2013. (4) The hot-pressing temperature played a decisive role in the tannin–sucrose adhesive, and the good performance of the plywood was maintained when the temperature was 210 °C or above. Thus, the prepared tannin–sucrose adhesive had high-bonding strength, good water resistance and thermal stability.

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Effects of polyethylene glycol on the flexibility of cold-setting melamine–urea–formaldehyde resin

Cited by 9 publications

References 15 publications

Effects of Plasma Treatment on the Surface Characteristics and Bonding Performance of Pinus massoniana Wood

Effects of Plasma Treatment on the Surface Characteristics and Bonding Performance of Pinus massoniana Wood

Comparison of nail-holding performance of Pinus massoniana and Cunninghamia lanceolata dimension lumber based on round steel nails

Fully Bio-Based Adhesive from Tannin and Sucrose for Plywood Manufacturing with High Performances

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