热压初始水分对重载纤维模塑材料性能的影响

发布时间：2019-03-30 10:24

【摘要】：分别以杨木高得率浆(HYP)、杨木化学浆(CP)、废纸板浆(WPP)为原料,研究热压初始水分含量(IMC)对重载纤维模塑材料性能的影响。依照Herzberg染色法和造纸原料化学分析的标准比较了纤维原料纤维种类和化学成分的异同,采用XPS、XRD和SEM表征手段系统比较了IMC对重载纤维模塑材料的化学组分、聚集态结构以及微观形貌的影响,同时考察了IMC对重载纤维模塑材料物理力学性能的影响。实验结果表明,零压干燥时,IMC增加导致WPP模塑材料密度与力学强度降低。在热压条件下,IMC的提高,促进胶黏性聚合物的生成,有助于改善HYP和CP模塑材料的结晶指数,利于纤维细胞腔压实和纤维间的紧密交织;IMC的提高,能够显著提高HYP、CP和WPP纤维模塑材料的密度和力学强度,IMC由10%增加到60%时,HYP、CP和WPP模塑材料的密度提高18.6%、23.8%和8.0%,拉伸强度提高119.74%、173.2%和168.3%,弯曲强度提高134.9%、140.2%和125.0%。
[Abstract]:The effect of the initial moisture content (IMC) of hot pressing on the properties of heavy-duty fiber molding materials was studied by using poplar high yield pulp (HYP),) (CP), waste paper pulp (WPP) as raw material. According to the standard of Herzberg staining and chemical analysis of papermaking raw materials, the similarities and differences of fiber types and chemical compositions of fiber raw materials were compared, and the chemical compositions of heavy-duty fiber molded materials were systematically compared by XPS,XRD and SEM, and the chemical compositions of heavy-duty fiber molded materials were compared by IMC. The effect of IMC on the physical and mechanical properties of heavy duty fiber molding materials was investigated. The experimental results show that the increase of IMC results in the decrease of density and mechanical strength of WPP molded materials under zero pressure drying. Under the condition of hot pressing, the increase of IMC promotes the formation of adhesive polymers, which helps to improve the crystallization index of HYP and CP molded materials, and is beneficial to the compacting of fibrous cells and the close interleaving of fibers. With the increase of IMC, the density and mechanical strength of HYP,CP and WPP fiber molded materials were significantly increased. When IMC increased from 10% to 60%, the density of HYP,CP and WPP molded materials increased by 18.6%, 23.8% and 8.0%, respectively, and the density of HYP,CP and WPP molded materials increased by 18.6%, 23.8% and 8.0%, respectively. The tensile strength increased by 119.74%, 173.2% and 168.3%, and the flexural strength increased by 134.9%, 140.2% and 125.0% respectively.
【作者单位】：东北林业大学工程技术学院;东北林业大学材料科学与工程学院;
【基金】：中央高校基本科研业务费专项资金(2572016AB69) 国家林业公益性行业科研专项(201304506)
【分类号】：TB302

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