scholarly journals Optimization of hot-press parameters for plywood with environmental aluminophosphate adhesive

BioResources ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. 1702-1712
Author(s):  
Qihua Wei ◽  
Zhenzeng Wu ◽  
Wei Wei ◽  
John Tosin Aladejana ◽  
Kouomo Guelifack Yves ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Bonding Strength ◽  
Optimal Parameter ◽  
Dominant Factor ◽  
Wood Fibers ◽  
Hot Press ◽  
X Ray ◽  
Press Temperature ◽  
Chemical Reaction Mechanism ◽  
Press Time

An aluminophosphate adhesive was used as the binder in plywood. The hot-pressing parameters of aluminophosphate adhesive-based plywood (APPs) including hot-press temperature (A), time (B), and pressure (C) were optimized using response surface methodology. Results indicated that the hot-press temperature was the most dominant factor. The maximum bonding strength of 1.98 MPa was found with an optimal parameter of 171 °C (hot-press temperature), 7.5 min (hot-press time), and 1.0 MPa (hot-press pressure). Additionally, the chemical reaction mechanism between aluminophosphate adhesive and wood fibers was characterized by X-ray photoelectron spectroscopy (XPS). Results showed that good interaction was generated between wood fibers and adhesives through their surface functional groups. In conclusion, the optimized pressing conditions of plywood significantly improved bonding strength of APPs.

Simple production of medium density fiberboards (MDF) reinforced with chitosan

Holzforschung ◽  
2018 ◽  
Vol 72 (4) ◽  
pp. 275-281 ◽  
Author(s):  
Xiaodi Ji ◽  
Yue Dong ◽  
Ruidong Yu ◽  
Wenxin Du ◽  
Xue Gu ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Photoelectron Spectroscopy ◽  
Medium Density Fiberboard ◽  
National Standard ◽  
Medium Density ◽  
Wood Fibers ◽  
Hot Press ◽  
X Ray ◽  
Amide Bonds ◽  
Simple Production

AbstractA simple and efficient method was developed for preparing medium density fiberboard (MDF) reinforced with chitosan via the traditional hot-press manufacturing process. The mechanical and dimensional properties of the MDF were investigated as a function of the chitosan amount. At the 4% level of added chitosan, the MDF reached the optimal performance and met completely the requirements of the Chinese national standard GB/T 11718-2009. Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS) and X-ray powder diffraction (XRD) characterizations revealed that wood fibers and chitosan might interact with each other through the formation of hydrogen and amide bonds during the hot-pressing process. The fracture surfaces of the MDFs are indicative for strong bonds at the interface, which explain the excellent MDF performance.

The Structure and Curing Acceleration of PMUF Resins with Sodium Carbonate

2011 ◽  
Vol 181-182 ◽  
pp. 287-292 ◽  
Author(s):  
Zhen Zhong Gao ◽  
Feng Liao
Keyword(s):  
Sodium Carbonate ◽  
13C Nmr ◽  
Bonding Strength ◽  
Water Resistance ◽  
Urea Formaldehyde ◽  
High Water ◽  
Curing Time ◽  
Hot Press ◽  
Resin Adhesive ◽  
Press Time

The phenol-melamine-urea-formaldehyde (PMUF) cocondensed resin adhesive was prepared by using phenol, urea, melamine and formaldehyde as reactants. It was characterized by 13C NMR and the results indicated that the PMUF could reduce the content of free formaldehyde, and it could make wood-based panel with high water resistance and weatherability. Sodium carbonate (Na2CO3) was able to shorten the curing time by 40% when applied to the plywood process. The addition of Na2CO3 as the curing accelerator of a PMUF had little influence on the bonding strength of waterproof layer and could shorten the hot-press time.

Poly (Lactic Acid)/Wood Fibers Biodegradable Composites

2010 ◽  
Vol 44-47 ◽  
pp. 2283-2287
Author(s):  
Ming Hui Guo ◽  
Yuan Yuan
Keyword(s):  
Lactic Acid ◽  
Water Resistance ◽  
Wood Fiber ◽  
Poly Lactic Acid ◽  
Flexural Properties ◽  
Wood Fibers ◽  
Hot Press ◽  
Press Temperature ◽  
Biodegradable Composites ◽  
Properties Of Composites

In our research, a commercial poly (lactic acid) (PLA) film was used in combination with wood fiber matrix to generate biodegradable composites by a film stacking technique and hot-press. The results showed the flexural properties and water resistance increased with the increasing of PLA addition. Silane-treated wood fiber composites significantly improved the flexural properties compared to untreated composites. In experiment range, the physical and mechanical properties of composites were better in higher hot-press temperature. The optimal parameters are determined by PLA addition 20%, silane addition 3%, the hot-press temperature 190°C, the hot-press time 10min.Under these parameters, the flexural properties of composites exceeded the requirement of the outdoor boards’ standard, but the water resistance was a little low.

Preparation of Plywood Using Starch Adhesives Modified with Isocyanate

2010 ◽  
Vol 26-28 ◽  
pp. 1065-1068 ◽  
Author(s):  
Ji You Gu ◽  
Ying Feng Zuo ◽  
Yan Hua Zhang ◽  
Hai Yan Tan ◽  
Li Bin Zhu ◽  
...  
Keyword(s):  
Chemical Bonding ◽  
Photoelectron Spectroscopy ◽  
Bonding Strength ◽  
Chemical Structure ◽  
Water Resistance ◽  
Influence Factors ◽  
Solid Content ◽  
Xps Analysis ◽  
X Ray ◽  
Key Factor

The purpose of the study was to manufacture plywood using starch adhesives modified by isocyanate, the influence factors on the bonding strength and water resistance of starch adhesive were studied by different solid content, adding additives and adding isocyanate. X-ray photoelectron spectroscopy (XPS) analysis was used to characterize the chemical structure of bonding interface. The results show that the bonding strength of starch adhesive was increased significantly when solid content increased to 50%. Bonding strength and water resistance were improved significantly by adding additives and isocyanates to starch adhesive. The analysis of XPS indicated that the chemical bonding derived from the reactions of isocyanate was the key factor to increase bonding strength and water resistance.

A New Interior Plywood Adhesive Based on Oil -Tea Cake

2011 ◽  
Vol 194-196 ◽  
pp. 2183-2186 ◽  
Author(s):  
Dong Bin Fan ◽  
Te Fu Qin ◽  
Fu Xiang Chu
Keyword(s):  
Shear Strength ◽  
Phenol Formaldehyde ◽  
Low Cost ◽  
Hot Press ◽  
Standard Requirement ◽  
Press Temperature ◽  
Industry Standard ◽  
Optimum Formulation ◽  
Press Time ◽  
Addition Level

The oil-tea cake, as the major byproduct of tea oil production, was used with phenol-formaldehyde (PF) resin to prepare a mixed interior plywood panel adhesive (TC-PF adhesive). The optimum formulation of this adhesive and the optimum hot-press conditions for making plywood panels were investigated in this work. The results showed that wet shear strength value of TC-PF adhesives increased when the addition level of PF resin increased. TC-PF adhesive with 50% PF resin addition had a relatively low cost, and moreover pass the bonding strength requirement of China Industry Standard for interior plywood panels. Hot-press temperature and hot-press time had obvious influence on bonding performances of plywood panels. When the hot-press temperature was in the range of 140°C-160°C, the wet shear strength value of panels bonded with the adhesives passed the China Industry Standard requirement. At 3-5min of hot-press time, the plywood panels had satisfactory wet shear strength.

Fast Curing Phenol-Formaldehyde Resin Catalyzed by a Complex Catalyst

2010 ◽  
Vol 113-116 ◽  
pp. 2124-2128 ◽  
Author(s):  
Shi Feng Zhang ◽  
Jian Zhang Li ◽  
Xiao Ying Liu ◽  
Yan An Ou ◽  
Qiang Gao
Keyword(s):  
Bonding Strength ◽  
Phenol Formaldehyde ◽  
Formaldehyde Emission ◽  
National Standards ◽  
Curing Temperature ◽  
Formaldehyde Resin ◽  
Hot Press ◽  
Scanning Calorimetry ◽  
Complex Catalyst ◽  
Press Temperature

For increasing the curing rate and decreasing the curing temperature, modified phenol-formaldehyde (PF) resins were synthesized under a complex catalyst. The bonding strength and formaldehyde emission of the plywood bonded by them were measured according to Chinese National Standards methods. The curing behavior was conducted by differential scanning calorimetry (DSC) measurement. The results indicate that PF resins catalyzed by the complex catalyst show more moderate pH values, lower curing temperature and shorter gel time comparing with control ones. Plywood bonded with modified PF resins shows good bonding strength and low formaldehyde emission even at low hot press temperature (110 °C), which is closed to the plywood bonded with normal control PF resin at high hot press temperature (130 °C).

Investigation of Carbon Fiber/Polyphenylenesulfone Composites by Method of X-Ray Photoelectron Spectroscopy

2019 ◽  
Vol 816 ◽  
pp. 37-42
Author(s):  
Z.K. Kalazhokov ◽  
A.V. Naumkin ◽  
Azamat Zhansitov ◽  
S.Yu. Khashirova ◽  
K.H. Kalazhokov ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Photoelectron Spectroscopy ◽  
Surface Region ◽  
Dominant Factor ◽  
Fiber Concentration ◽  
X Ray ◽  
The Matrix ◽  
Bulk Part

The surfaces of polyphenylenesulfone samples with the addition of carbon fibers were studied by X-ray photoelectron and Auger-electron spectroscopy. The state of carbon atoms on the surface, the electronic structure, and the distribution of carbon fibers in the surface region as a function of the concentration of the additive were studied. It is shown that with 10 mass. % carbon fiber addition, the transformation of peaks is mainly associated with an increase in the number of carboxyl groups in the matrix, while with a carbon content exceeding 10 mass. %, the increasing role of differential vertical charging becomes the dominant factor. A further increase in the carbon fiber concentration leads to an increase in the conductivity of the bulk part and, consequently, to a decrease in the charge layer without carbon fiber, and therefore, to a decrease in the broadening effect of the C 1s carbon peak.

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