Effect of Different Temperature and Humidity Curing Treatments on Properties of Magnesium Oxychloride Inorganic Plywood

SHU Fangrong; ZHU Jiangang; SHEN Yunfang; GUI Chengsheng

doi:10.12326/j.2096-9694.2025049

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Effect of Different Temperature and Humidity Curing Treatments on Properties of Magnesium Oxychloride Inorganic Plywood
1.College of Furnishings and Industrial Design，Nanjing Forestry University，Nanjing 210037，Jiangsu，China
2.Zhejiang Shenghua Yunfeng New Materials Co.，Ltd.，Huzhou 313200，Zhejiang，China
Vol. 39, Issue 5, Pages: 66-73(2025)
DOI： 10.12326/j.2096-9694.2025049
稿件说明：

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束方荣,朱剑刚,沈云芳等.不同温湿度条件养护处理对氯氧镁无机胶合板性能的影响[J].木材科学与技术,2025,39(05):66-73. DOI： 10.12326/j.2096-9694.2025049.

SHU Fangrong,ZHU Jiangang,SHEN Yunfang,et al.Effect of Different Temperature and Humidity Curing Treatments on Properties of Magnesium Oxychloride Inorganic Plywood[J].Chinese Journal of Wood Science and Technology,2025,39(05):66-73. DOI： 10.12326/j.2096-9694.2025049.

摘要

养护处理通过调控环境的温湿度条件，能够优化氯氧镁胶黏剂的固化进程，进而改善无机胶合板的微观结构及综合性能。以杉木（

Cunninghamia lanceolata

）单板为基材，氯氧镁胶黏剂为胶接材料，通过调控养护处理的温湿度条件，研究不同温湿度条件对氯氧镁胶黏剂固化时间、微观结构和胶合板性能的影响。结果表明：适宜温湿度通过促进518相（5 Mg（OH）₂·MgCl₂·8H₂O）晶体定向生长，抑制Mg（OH）₂生成，显著提升胶黏剂交联密度。在70 ℃、30%相对湿度条件下，氯氧镁胶黏剂中518相晶体含量达到峰值，胶合板内部形成致密有序的微观结构，其静曲强度提升至54 MPa，弹性模量增至7 407 MPa，相比常温条件养护的对照样分别提升44.8%和39.1%；Ⅲ类胶合强度达0.98 MPa，浸渍剥离长度降至12 mm，符合GB/T 9846—2015《普通胶合板》要求。研究提出的优化温湿度条件可显著缩短氯氧镁胶黏剂的固化进程，提升氯氧镁无机胶合板的性能，为其工业化生产提供关键工艺参数。

Abstract

By regulating temperature and humidity conditions

the curing process of magnesium oxychloride adhesive can be optimized; the microstructure and properties of inorganic plywood can be improved as well. Plywood from

Cunninghamia lanceolata

veneer with magnesium oxychloride adhesive was prepared under different temperature and humidity conditions during the curing environment. The curing time

microstructure

and plywood properties of magnesium oxychloride adhesive were experimentally tested. Microscopic analysis showed that suitable temperature and humidity

promotes the oriented growth of 518 phase crystals (5 Mg(OH)₂•MgCl₂•8H₂O) and inhibits the formation of Mg(OH)₂

which significantly enhance the cross-linking density of the adhesive. Under conditions of 70 °C and 30% relative humidity

the content of 518 phase crystals in the adhesive reached its peak

forming a dense and orderly microstructure inside the plywood

resulting in an increase of static bending strength to 54 MPa and an increase of elastic modulus to 7 407 MPa

which was improved by 44.8% and 39.1% compared to the control samples cured under conventional conditions; the bond strength reaches 0.98 MPa

and the soaking delamination length decreases to 12 mm

complying with the national standard GB/T 9846—2015 Plywood for general use. The study confirms that optimized temperature and relative humidity conditions can significantly shorten the curing time of magnesium oxychloride adhesives and improve the performance of magnesium oxychloride inorganic plywood

providing key parameters for industrial production.

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Keywords

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