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Preparation method of special wood powder for wood-plastic composite
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A technology of wood-plastic composite materials and wood powder, which is applied in the field of wood processing, can solve the problems of weak interface layer, reduce the performance of composite materials, and affect interface compatibility, etc., so as to reduce hygroscopicity, improve use efficiency, and improve interface compatibility. sexual effect
Inactive Publication Date: 2014-12-24
BEIJING FORESTRY UNIVERSITY
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In addition, as Hemmasi et al. (Journal of Reinforced Plastics and Composites 29, 964-971) showed that when montmorillonite is added to wood-plastic composites, when the montmorillonite content is too high (higher than 6%), a large amount of Adhering to the surface of wood powder and compounding with plastic will form a weak interface layer, which will affect the compatibility of the interface and reduce the performance of the composite material
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Embodiment 1
[0046] The wood flour is Populus tomentasa Carr., 10-60 mesh, Hebei Gaocheng Xingda Wood Flour Factory; Na-MMT, 200 mesh, cation exchange capacity (CEC) is 90mmol / 100g, the interlayer distance is 1.459nm, Zhejiang Fenghong Clay Chemical Co., Ltd.; didecyldimethylammonium chloride (DDAC), mass percent concentration 70%, Sanbo Biochemical Technology (Shanghai) Co., Ltd.; polyethylene glycol (PEG), molecular weight 1000, Fushun Jiahua Chemical Co., Ltd., Liaoning Province; polylactic acid (poly L-, Yisheng AI-1001 type), number average molecular weight 80000, density 1.25g / cm 3 , Melt index 10-20g / min, Shenzhen Guanghua Weiye Industrial Co., Ltd.
[0047] (1) Vacuum pressure impregnation treatment of wood flour
[0048] The first step: Dissolve sodium-based montmorillonite in deionized water, and its mass percentage concentration is 0.5%. At the same time, in order to improve the stability of the suspension, add a certain amount of polyethylene glycol-1000 (PEG -1000), wherein...
Embodiment 2
[0053] During the experiment, except that Populus tomentasa Carr., 60-80 mesh, was used at Xingda Wood Flour Factory in Gaocheng, Hebei, the rest were the same as in Example 1.
Embodiment 3
[0055] During the experiment, except that poplar tomentasa wood flour (Populus tomentasa Carr.), 100 mesh, was used, Hebei Gaocheng Xingda Wood Flour Factory, the rest were the same as in Example 1.
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Abstract
The invention provides a preparation method of special wood powder for a wood-plastic composite. The preparation method comprises the following steps of 1, impregnating Na-montmorillonite suspension in the wood powder, and 2, modifying Na-montmorillonite in the wood powder. The modified wood powder is prepared with a two-step method, and can improve the interfacial compatibility of the wood-plastic composite; the use efficiency of the wood powder is improved; the wood powder is converted from a simple filling to a reinforcing material; and the preparation method can be applied to the fields of preparing the wood-plastic composite and other composites using the wood powder, such as fiber boards.
Description
technical field [0001] The invention relates to a preparation method of special wood flour for wood-plastic composite materials, which belongs to the field of wood processing. Background technique [0002] Wood-plastic composite material (Wood-plastic composite, WPC) is composed of wood and plastic, and has excellent comprehensive performance due to the combination of the dual advantages of wood and plastic. However, there are a large number of polar functional groups on the surface of wood. During the compounding process of wood-plastic composite materials, there is a high interfacial energy difference between the hydrophilic wood material and the hydrophobic plastic material, and it is difficult for the two materials to achieve Adequate surfaces blend into each other. In addition, the hydrogen bonding between wood surfaces also makes wood fibers not uniformly dispersed in thermoplastics, which affects the performance of wood-plastic composites. Therefore, improving the c...
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