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17,419 results on '"Gao, Li"'

608. Composite waterborne polyurethane reinforced with silane modified lignin as an adhesive between polypropylene decorative films and wood-based panels

Author

Chang, Liang, Luo, Shupin, Gao, Li, Ren, Yiping, Tang, Qiheng, and Chen, Yongping

Subjects
Polypropylene -- Properties, Polyurethanes -- Properties, Engineering and manufacturing industries, Science and technology
Abstract

To improve the surface bonding strength of polypropylene (PP) decorative films on wood-based panels, one kind of lignin, namely sodium lignosulfonate (SL) filled waterborne polyurethane (WPU) composites were used as adhesives on the back of the PP decorative films, and the SL was modified by the addition of two alternative types of silane that contain either ethylene-acyloxy or epoxy groups. The PP decorative films were hot-press onto plywood using the different types of SL modified WPU as an adhesive. The SL and SL modified WPU were characterized comprehensively. The surface properties the PP decorative films on plywood surfaces were tested. The results showed that both types of silane can be grafted on the SL between hydrolyzed Si--OH groups and -OH groups. The long organic chain of silane can physically twist to the WPU, where self-polymerization of the silane helps to form network structures. As a result, the surface bonding strength of PP decorative films on plywood surfaces largely improved with SL filled WPU adhesives and no detachment occurred in boiling water. Compared with the ethylene-acyloxy silane, the epoxy silane performed better which was associated with the reactions between the epoxy groups and free water. KEYWORDS plywood, polypropylene decorative film, sodium lignosulfonate, surface bonding strength, waterborne polyurethane composites, 1 | INTRODUCTION Polyolefin decorative films produced from polyvinyl chloride (PVC) or polypropylene (PP) materials are important surface finishing products that are widely used in wood-based products such as wooden [...]

Published
2022
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644. Effect of Foreign Ions on Corrosion Resistance of AA5052 Aluminum Alloy in the Simulated Coolant

Author

YOU Liang - zhou, HENG Shi - quan, LU Jia - min, LI Xiao - hui, GAO Li - xin, ZHANG Da - quan

Subjects
simulated coolant, foreign ions, aluminum alloy, corrosion, Materials of engineering and construction. Mechanics of materials, TA401-492, Technology
Abstract

In order to study the effect of metal ions on the corrosion of aluminum alloy, the corrosion resistance of AA5052 aluminum alloy in the simulated coolant (33% glycol solution) containing foreign ions (Cl-, Fe3+, Cu2+) was investigated by weight - loss method, plasma chromatography and the scanning electron microscope (SEM). Results showed that the corrosion reaction of AA5052 aluminum alloy in the above - mentioned solution followed a first - order kinetic process. Foreign ions accelerated the corrosion reaction of AA5052 alloy in the stimulate coolant. Besides, the order of corrosion rates of AA5052 aluminum alloy in glycol solutions containing different complex foreign ions was as follow: [Fe3++Cu2+]>[Fe3++Cu2++Cl-]>[Fe3++Cl-]>[Cu2++Cl-].

Published
2022
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645. A New Uzawa-exact Type Algorithm for Nonsymmetric Saddle Point Problems

Author

Xu, Zhitao, Jiang, Ting, and Gao, Li

Subjects
Mathematics - Optimization and Control, 65F10 65K05 90C06
Abstract

Saddle point problems have been attracting people's attention in recent years. To solve large and sparse saddle point problems, Uzawa type algorithms were proposed. The main contribution of this paper is to present a new Uzawa-exact type algorithm from the aspect of optimization method to solve nonsymmetric saddle point problems, which often arise from linear variational inequalities and finite element discretization of Navier-Stokes equations. In the paper, convergence of the new algorithm is analysed and numerical experiments are presented.

Published
2018

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