{"title":"微波过热蒸汽处理辐射松木树脂去除和固定的研究","authors":"Huimin Cao, Saisai Huang, Fan Zhou, Xin Gao, Songlin Yi, Yongdong Zhou","doi":"10.1007/s00107-023-02038-y","DOIUrl":null,"url":null,"abstract":"<div><p>Radiata pine is a valuable resource for construction and furniture manufacturing. However, its heartwood, which has a high resin content (RC), is limited in its applications. This is because the exudation of resin can cause issues such as unsightly appearance, degumming, or paint bubbling, posing a significant challenge to its use. Hence, the heartwood of radiata pine was taken as the research object, and the resin in wood removed and fixed by microwave-superheated steam (MS) treatment was studied. The moisture content (MC), RC, relative content of turpentine, and the anti-resin-exudation performance were determined; the changes in the morphology of resin in the resin canals, the Young's modulus of the latewood cell wall, and the chemical composition were analyzed. The findings show that MS can remove some of the pine resin in the wood, but not all. Microscopic observations confirmed that some resin remained in the resin canals of the MS treatment samples. In addition, the turpentine content decreased dramatically after MS treatment. For instance, the average turpentine content of latewood in samples after treatment at 120 °C was reduced to 9.7%, only 0.3% after treatment at 140 °C, and no turpentine was detected after treatment at 160 °C. This may explain why the wood after MS treatment showed good anti-resin-exudation, as the volatilization of turpentine would lead to the increase in softening point and thermal stability of resin. In addition, the Young's modulus of latewood cell wall increased with superheated steam (SS) treatment temperature. The resin was oxidized, dehydrogenated, and isomerized after MS treatment. These findings confirmed that MS treatment improves the anti-resin-exudation performance of radiata pine by increasing the softening point of residual resin and fixing it inside the wood. Through this strategy, the treated radiata pine heartwood shows greater potential for application.</p></div>","PeriodicalId":550,"journal":{"name":"European Journal of Wood and Wood Products","volume":"82 3","pages":"785 - 796"},"PeriodicalIF":2.4000,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A study of resin removal and fixation of radiata pine wood by microwave-superheated steam treatment\",\"authors\":\"Huimin Cao, Saisai Huang, Fan Zhou, Xin Gao, Songlin Yi, Yongdong Zhou\",\"doi\":\"10.1007/s00107-023-02038-y\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Radiata pine is a valuable resource for construction and furniture manufacturing. However, its heartwood, which has a high resin content (RC), is limited in its applications. This is because the exudation of resin can cause issues such as unsightly appearance, degumming, or paint bubbling, posing a significant challenge to its use. Hence, the heartwood of radiata pine was taken as the research object, and the resin in wood removed and fixed by microwave-superheated steam (MS) treatment was studied. The moisture content (MC), RC, relative content of turpentine, and the anti-resin-exudation performance were determined; the changes in the morphology of resin in the resin canals, the Young's modulus of the latewood cell wall, and the chemical composition were analyzed. The findings show that MS can remove some of the pine resin in the wood, but not all. Microscopic observations confirmed that some resin remained in the resin canals of the MS treatment samples. In addition, the turpentine content decreased dramatically after MS treatment. For instance, the average turpentine content of latewood in samples after treatment at 120 °C was reduced to 9.7%, only 0.3% after treatment at 140 °C, and no turpentine was detected after treatment at 160 °C. This may explain why the wood after MS treatment showed good anti-resin-exudation, as the volatilization of turpentine would lead to the increase in softening point and thermal stability of resin. In addition, the Young's modulus of latewood cell wall increased with superheated steam (SS) treatment temperature. The resin was oxidized, dehydrogenated, and isomerized after MS treatment. These findings confirmed that MS treatment improves the anti-resin-exudation performance of radiata pine by increasing the softening point of residual resin and fixing it inside the wood. Through this strategy, the treated radiata pine heartwood shows greater potential for application.</p></div>\",\"PeriodicalId\":550,\"journal\":{\"name\":\"European Journal of Wood and Wood Products\",\"volume\":\"82 3\",\"pages\":\"785 - 796\"},\"PeriodicalIF\":2.4000,\"publicationDate\":\"2024-01-19\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"European Journal of Wood and Wood Products\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s00107-023-02038-y\",\"RegionNum\":3,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"FORESTRY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"European Journal of Wood and Wood Products","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s00107-023-02038-y","RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"FORESTRY","Score":null,"Total":0}
引用次数: 0
摘要
辐射松是建筑和家具制造的宝贵资源。然而,树脂含量(RC)较高的心材却限制了它的应用。这是因为树脂的渗出会导致外观难看、脱胶或油漆起泡等问题,给其使用带来巨大挑战。因此,以辐射松的心材为研究对象,研究了通过微波加热蒸汽(MS)处理去除和固定木材中的树脂。测定了含水率(MC)、RC、松节油相对含量和抗树脂渗出性能;分析了树脂通道中树脂形态的变化、晚材细胞壁的杨氏模量和化学成分。研究结果表明,MS 可以去除木材中的部分松脂,但不是全部。显微镜观察证实,一些树脂残留在 MS 处理样本的树脂管中。此外,经 MS 处理后,松节油含量大幅下降。例如,在 120 °C 处理后,样品中晚材的平均松节油含量降至 9.7%,在 140 °C 处理后仅为 0.3%,而在 160 °C 处理后则未检测到松节油。这也许可以解释为什么经过 MS 处理的木材具有良好的抗树脂渗出性,因为松节油的挥发会导致树脂软化点和热稳定性的提高。此外,晚材细胞壁的杨氏模量随过热蒸汽(SS)处理温度的升高而增大。经 MS 处理后,树脂发生了氧化、脱氢和异构化。这些研究结果证实,MS 处理可通过提高残留树脂的软化点并将其固定在木材内部,从而改善辐射松的抗树脂渗出性能。通过这种策略,经过处理的辐射松心材显示出更大的应用潜力。
A study of resin removal and fixation of radiata pine wood by microwave-superheated steam treatment
Radiata pine is a valuable resource for construction and furniture manufacturing. However, its heartwood, which has a high resin content (RC), is limited in its applications. This is because the exudation of resin can cause issues such as unsightly appearance, degumming, or paint bubbling, posing a significant challenge to its use. Hence, the heartwood of radiata pine was taken as the research object, and the resin in wood removed and fixed by microwave-superheated steam (MS) treatment was studied. The moisture content (MC), RC, relative content of turpentine, and the anti-resin-exudation performance were determined; the changes in the morphology of resin in the resin canals, the Young's modulus of the latewood cell wall, and the chemical composition were analyzed. The findings show that MS can remove some of the pine resin in the wood, but not all. Microscopic observations confirmed that some resin remained in the resin canals of the MS treatment samples. In addition, the turpentine content decreased dramatically after MS treatment. For instance, the average turpentine content of latewood in samples after treatment at 120 °C was reduced to 9.7%, only 0.3% after treatment at 140 °C, and no turpentine was detected after treatment at 160 °C. This may explain why the wood after MS treatment showed good anti-resin-exudation, as the volatilization of turpentine would lead to the increase in softening point and thermal stability of resin. In addition, the Young's modulus of latewood cell wall increased with superheated steam (SS) treatment temperature. The resin was oxidized, dehydrogenated, and isomerized after MS treatment. These findings confirmed that MS treatment improves the anti-resin-exudation performance of radiata pine by increasing the softening point of residual resin and fixing it inside the wood. Through this strategy, the treated radiata pine heartwood shows greater potential for application.
期刊介绍:
European Journal of Wood and Wood Products reports on original research and new developments in the field of wood and wood products and their biological, chemical, physical as well as mechanical and technological properties, processes and uses. Subjects range from roundwood to wood based products, composite materials and structural applications, with related jointing techniques. Moreover, it deals with wood as a chemical raw material, source of energy as well as with inter-disciplinary aspects of environmental assessment and international markets.
European Journal of Wood and Wood Products aims at promoting international scientific communication and transfer of new technologies from research into practice.