基于响应面法的竹材浸蜡热压改性工艺优化研究

Optimization of Bamboo Wax-impregnated Hot-pressing Modification Process Based on Response Surface Methodology

以竹片为基材,利用聚乙烯蜡为改性剂进行竹材浸渍热压工艺改性处理.基于单因素试验,使用响应面法对工艺进行优化,并建立二次多元回归模型.结果表明:热压改性可使得聚乙烯蜡有效地渗透到竹材的内部.热压压力和热压时间为关键因素,其具有显著交互作用.当热压压力、温度、时间分别为2.2 MPa、123℃和8 min时,竹材顺纹抗拉强度达到205.39 MPa,与模型预测值基本相符,相较于素材提高了84.77%.同时,经改性处理后竹材表面的表面憎水性增强,初始接触角(WCA)由70.12°提高到82.26°,且60 s内仅有小幅下降.

Bamboo sheets are used as the base material,and polyethylene wax is used as the modifier to carry out the modification treatment of bamboo impregnation and hot pressing.Based on the single factor experiment,the process is optimized by using the response surface methodology,and a quadratic multiple regression model is established.The results show that the hot-pressing modification can effectively penetrate the polyethylene wax into the interior of the bamboo.The hot-pressing pressure and hot-pressing time are key factors,which have significant interaction.When the hot-pressing pressure,temperature and time are 2.2 MPa,123 and 8 min,respectively,the tensile strength of bamboo along the grain reaches 205.39 MPa,which was basically consistent with the predicted value of the model and increased by 84.77%compared with untreated bamboo.At the same time,the surface hydrophobicity of the bamboo surface after modification treatment is enhanced,and the initial contact angle(WCA)increaseds from 70.12°to 82.26°,and decreases slightly within 60 s.