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Improving the hydrophobicity, dimensional stability and mold resistance of bamboo by paraffin/microcrystalline wax/stearic acid modification
Abstract As an environment-friendly material, bamboo has a wide application prospect in the fields of construction, furniture and decoration. However, the problems of dimensional instability and susceptibility to mildew of bamboo seriously affect the economic values of bamboo and bamboo-based products. The performance of bamboo can be improved by modification treatment, but there are problems such as toxicity of modifier, complicated modification process and high modification cost. Therefore, from the perspective of facile, effective and green modification, bamboo with hydrophobicity, dimensional stability and mold resistance effect was prepared by high-pressure impregnation treatment of a wax-based composite system composed of non-toxic and low-cost paraffin, microcrystalline wax and stearic acid. The results showed that the wax-based composite system significantly improved the hydrophobicity, dimensional stability and mold resistance of bamboo. The 8 days’ water absorption of bamboo modified by paraffin, microcrystalline wax and stearic acid (PSM-B) was reduced by 33.14 % compared with the raw bamboo. The swelling resistance coefficient and the surface contact angle of PSM-B reached 81.04 % and 108.8°. PSM-B has almost no mold occurred in the 20-day antifungal test. This study provides a new idea for the protection of bamboo products, which has a broad application prospect.
Highlights There have been studies on the modification of wood and bamboo using paraffin, vegetable oil, or a paraffin/vegetable oil composite system, but relevant scholars have focused their research on using a single wax or vegetable oil and a normal temperature and pressure impregnated paraffin/vegetable oil composite system to modify wood and bamboo. There is no research on the heat treatment process to realize the moisture shielding of bamboo by one-step method. In addition, the fine control of wax-based composite system, the controllable preparation method of modified bamboo and its performance influencing mechanism are still unclear, and in-depth systematic research is needed. The impregnation process of bamboo was improved to make the wax-based composite system impregnate bamboo more adequately (10 MPa, 70 °C, 30 min to 20 MPa, 80 °C, 2 h) in comparison with the study of Piao et al. The addition of microcrystalline wax increased the melting point of the system (62.9 °C to 76.5 °C), which improved the thermal stability of the wax-based composite system and expanded its application in high temperature environments. This is the first combination of paraffin stearic acid and microcrystalline wax to modify bamboo through a combination of physical and chemical methods, using the optimal ratio to achieve wax composite system can provide theoretical basis and technical support for the preparation and performance control of bamboo green modifiers. This research does not use mold inhibitors and preservatives, and uses heating and high-pressure immersion treatment methods to study a one-step heat treatment process to achieve bamboo moisture shielding, and prepare bamboo materials with permanent styling and antifungal functions. It is a bamboo material modification with an important innovation in method. In this research, technologies such as FTIR, XPS and so on, are applied to the wax-based composite system/bamboo heterogeneous interface study, and the research method is innovative, which can provide reference for related or similar research in the future.
Improving the hydrophobicity, dimensional stability and mold resistance of bamboo by paraffin/microcrystalline wax/stearic acid modification
Abstract As an environment-friendly material, bamboo has a wide application prospect in the fields of construction, furniture and decoration. However, the problems of dimensional instability and susceptibility to mildew of bamboo seriously affect the economic values of bamboo and bamboo-based products. The performance of bamboo can be improved by modification treatment, but there are problems such as toxicity of modifier, complicated modification process and high modification cost. Therefore, from the perspective of facile, effective and green modification, bamboo with hydrophobicity, dimensional stability and mold resistance effect was prepared by high-pressure impregnation treatment of a wax-based composite system composed of non-toxic and low-cost paraffin, microcrystalline wax and stearic acid. The results showed that the wax-based composite system significantly improved the hydrophobicity, dimensional stability and mold resistance of bamboo. The 8 days’ water absorption of bamboo modified by paraffin, microcrystalline wax and stearic acid (PSM-B) was reduced by 33.14 % compared with the raw bamboo. The swelling resistance coefficient and the surface contact angle of PSM-B reached 81.04 % and 108.8°. PSM-B has almost no mold occurred in the 20-day antifungal test. This study provides a new idea for the protection of bamboo products, which has a broad application prospect.
Highlights There have been studies on the modification of wood and bamboo using paraffin, vegetable oil, or a paraffin/vegetable oil composite system, but relevant scholars have focused their research on using a single wax or vegetable oil and a normal temperature and pressure impregnated paraffin/vegetable oil composite system to modify wood and bamboo. There is no research on the heat treatment process to realize the moisture shielding of bamboo by one-step method. In addition, the fine control of wax-based composite system, the controllable preparation method of modified bamboo and its performance influencing mechanism are still unclear, and in-depth systematic research is needed. The impregnation process of bamboo was improved to make the wax-based composite system impregnate bamboo more adequately (10 MPa, 70 °C, 30 min to 20 MPa, 80 °C, 2 h) in comparison with the study of Piao et al. The addition of microcrystalline wax increased the melting point of the system (62.9 °C to 76.5 °C), which improved the thermal stability of the wax-based composite system and expanded its application in high temperature environments. This is the first combination of paraffin stearic acid and microcrystalline wax to modify bamboo through a combination of physical and chemical methods, using the optimal ratio to achieve wax composite system can provide theoretical basis and technical support for the preparation and performance control of bamboo green modifiers. This research does not use mold inhibitors and preservatives, and uses heating and high-pressure immersion treatment methods to study a one-step heat treatment process to achieve bamboo moisture shielding, and prepare bamboo materials with permanent styling and antifungal functions. It is a bamboo material modification with an important innovation in method. In this research, technologies such as FTIR, XPS and so on, are applied to the wax-based composite system/bamboo heterogeneous interface study, and the research method is innovative, which can provide reference for related or similar research in the future.
Improving the hydrophobicity, dimensional stability and mold resistance of bamboo by paraffin/microcrystalline wax/stearic acid modification
Zhao, Zhengbo (author) / Qin, Chen (author) / Piao, Xixi (author) / Yan, Yutao (author) / Cao, Yizhong (author) / Wang, Zhe (author) / Jin, Chunde (author)
2024-01-03
Article (Journal)
Electronic Resource
English
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