The influence of the solvent removal process on subsequent molding of impregnated wood with melamine formaldehyde resin

IF 3.1 2区农林科学 Q1 FORESTRY

Wood Science and Technology Pub Date : 2023-12-23 DOI:10.1007/s00226-023-01522-1

Masako Seki, Yuko Yashima, Daisuke Shimamoto, Mitsuru Abe, Tsunehisa Miki, Masakazu Nishida

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Abstract

The resin impregnation treatment of wood is used as a pretreatment to improve the deformability of wood and the durability of its formed products. The objective of this study was to clarify the effect of solvent removal after resin impregnation on wood deformation. A solution of melamine formaldehyde (MF) resin was impregnated into the wood, and the solvent was removed from the wood under vacuum or different relative humidity (RH) conditions. The deformability of MF-resin-impregnated wood was evaluated based on the load required for molding. A higher RH during solvent removal allowed the MF resin to penetrate the cell wall, while the polymerization of the MF resin impregnated in the cell lumen and cell walls was accelerated. Polymerization of the impregnated resin significantly reduced the deformability. The cell orientation and distribution of the MF resin at the cellular level in the molded products were evaluated by X-ray diffraction and Raman mapping. The results showed that the higher the RH during the solvent removal process, the higher the cell orientation and amount of resin in the cell wall. These results suggest that the solvent removal process after resin impregnation has a significant effect on deformability during deformation processing and the formed products.

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溶剂去除工艺对三聚氰胺甲醛树脂浸渍木材后续成型的影响

对木材进行树脂浸渍处理是一种预处理方法，可改善木材的变形性及其成型产品的耐久性。本研究旨在阐明树脂浸渍后去除溶剂对木材变形的影响。将三聚氰胺甲醛树脂（MF）溶液浸渍到木材中，然后在真空或不同相对湿度（RH）条件下去除木材中的溶剂。三聚氰胺甲醛树脂浸渍木材的变形能力是根据成型所需的载荷来评估的。在去除溶剂的过程中，相对湿度越高，中链烯烃树脂就越容易渗透到细胞壁中，而浸渍在细胞腔和细胞壁中的中链烯烃树脂的聚合速度就越快。浸渍树脂的聚合大大降低了变形能力。通过 X 射线衍射和拉曼图谱评估了模塑产品中的细胞取向和 MF 树脂在细胞层面的分布。结果表明，在去除溶剂的过程中，相对湿度越高，细胞取向和细胞壁中的树脂量就越高。这些结果表明，树脂浸渍后的溶剂去除过程对变形加工过程中的变形性和成型产品有显著影响。

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来源期刊

Wood Science and Technology 工程技术-材料科学：纸与木材

CiteScore

5.90

自引率

5.90%

发文量

审稿时长

3 months

期刊介绍： Wood Science and Technology publishes original scientific research results and review papers covering the entire field of wood material science, wood components and wood based products. Subjects are wood biology and wood quality, wood physics and physical technologies, wood chemistry and chemical technologies. Latest advances in areas such as cell wall and wood formation; structural and chemical composition of wood and wood composites and their property relations; physical, mechanical and chemical characterization and relevant methodological developments, and microbiological degradation of wood and wood based products are reported. Topics related to wood technology include machining, gluing, and finishing, composite technology, wood modification, wood mechanics, creep and rheology, and the conversion of wood into pulp and biorefinery products.