黄荆木重组材热压工艺及其耐久性能研究

发布时间：2018-04-30 08:18

本文选题：灌木黄荆 + 热压工艺　；参考：《中南林业科技大学》2017年硕士论文

【摘要】：论文以灌木黄荆为研究对象,探讨黄荆木重组材的热压工艺及其耐久性能,研究黄荆木重组材用作家具材料的可行性,以期开发新型家具材料,为合理、高效利用灌木黄荆制备家具用重组材提供理论依据。以热压时间、热压压力、热压温度和密度为工艺因素,进行单因素实验和正交实验,研究黄荆木重组材MOR(静曲强度)、MOE(弹性模量)、IB(内结合强度)和TS24h(24h吸水厚度膨胀率)的变化规律,分析不同工艺因素对黄荆木重组材物理力学性能影响的显著程度,确定黄荆木重组材的最优工艺参数。通过电镜扫描分析和红外光谱分析,研究黄荆木重组材微观形态和化学成分的差异,探讨黄荆木束的压缩变形、黄荆木重组材的胶合机理。通过室外型人造板加速老化性能实验和耐沸水性能实验,对黄荆木重组材的非生物作用耐久性进行测试,探讨不同工艺因素对黄荆木重组材耐久性能的影响。论文的主要研究结果如下:(1)热压时间对黄荆木重组材的TS24h影响一般显著,对MOR、MOE和IB影响不显著。热压压力是黄荆木重组材MOE的极显著影响因素,不是MOR、IB和TS24h的显著影响因素。当热压压力由4 MPa升至6 MPa时,黄荆木重组材的MOE提高了 26.7%。热压温度对黄荆木重组材的MOR影响极显著,对MOE、IB和TS24h影响不显著。当热压温度由150℃升至170℃时,黄荆木重组材的MOR提高了 23.6%。密度是黄荆木重组材MOR和MOE的极显著影响因子,也是黄荆木重组材IB和TS24h的显著影响因子。当密度由0.8g/cm3增大至1.2g/cm3时,黄荆木重组材的MOR和MOE分别提高了 22.1%、35.2%,IB降低了 56.1%,TS24h 减小了 55.1%。(2)黄荆木重组材的最优热压工艺参数为:热压时间11.2min、热压压力4MPa、热压温度160℃、密度1.20g/cm3,当采用上述热压工艺时,黄荆木重组材的 MOR 为 114 MPa,MOE 为 11.33 GPa,IB 为 0.92 MPa,TS24h为 8.0%。符合LYT1580-2010《定向刨花板》OSB/2型板材(厚度小于10mm)规定干燥状态承载板材 MOR≥22.0MPa、MOE≥3.5GPa、IB≥0.34MPa、TS24h≤20%的要求。(3)各项性能较优的黄荆木重组材木材的大部分导管和细胞腔内都充填有酚胶,高温高压制板过后,其内部微观结构仍保持良好形态;而各项性能较差的黄荆木重组材,高温高压制板过后,其内部微观结构受到严重的挤压扭曲变形。性能较差的板材胶合层宽度远远大于性能较优的板材胶合层宽度,且各项性能较差的黄荆木重组材的胶合层结合松散,而各项性能较优的黄荆木重组材的胶合层结合紧密。板材在胶合反应中生成C-O-C基团,C-O-C基团是影响胶合性能的重要基团,其在单板胶缝处的胶合起着纽带作用,使得分子间的作用力增强。(4)老化处理材的内结合强度下降幅度为30.43%-50.00%,质量增加范围在5%-17%,厚度增加幅度为6%-14%,内结合强度变化幅度要明显高于质量和厚度变化幅度。密度对老化处理材的内结合强度、质量增加百分率和厚度增加百分率影响显著,热压压力对老化处理材的内结合强度、质量增加百分率和厚度增加百分率影响不显著。当密度从0.8 g/cm3增至1.2 g/cm3时,内结合强度的下降幅度为44%,质量增加百分率的下降幅度为8.67%,厚度增加百分率的下降幅度为5.00%。(5)当热压温度为160℃,密度为1.20g/cm3,热压压力为4MPa,热压时间为11.2 min时,老化处理材的耐久性能最优,内结合强度为0.64 MPa,质量增加百分率为6%,厚度增加百分率为7%,满足LYT1580-2010《定向刨花板》OSB/3型板材(厚度小于10mm)规定潮湿状态承载板材煮沸实验后IB≥0.15MPa的要求。(6)黄荆木重组材获取最佳物理力学性能和耐久性能的较优工艺参数为:热压温度160℃,密度1.20g/cm3,热压压力4Mpa,热压时间11.2min。(7)当作为室内家具用材时,黄荆木重组材的静曲强度和弹性模量较大,其值可媲美少数优质硬木。然而,黄荆木重组材的密度也较大,建议依据使用要求进行适当调整。当用作户外家具材料时,黄荆木重组材的2h沸水煮后内结合强度高于刨花板和中密度纤维板,低于胶合板;厚度增加百分率低于中密度纤维板,高于重组竹。因而,黄荆木重组材的厚度增加百分率也略高,建议采用透明涂料对其进行表面涂饰处理,既能起到防水的作用,又可保持自然的纹理。
[Abstract]:This paper takes the Bush yellow Vitex as the research object, discusses the hot pressing technology and durability of the recombined wood of the Vitex Vitex, and studies the feasibility of the Huang Jingmu reengineering material used as the furniture material, in order to develop the new type of furniture material and provide the theoretical basis for the rational and efficient use of the shrub yellow Vitex to prepare the recombined material for furniture. With the density as the technological factors, single factor experiment and orthogonal experiment were carried out to study the change law of MOR (static curve strength), MOE (elastic modulus), IB (internal bonding strength) and TS24h (24h water thickness expansion rate). The influence of different technological factors on the physical and mechanical properties of Huang Jingmu reconstituted wood was analyzed, and the restructure of the tree was determined. The optimum technological parameters of the material were analyzed by scanning electron microscope and infrared spectrum analysis. The differences in microstructure and chemical composition of the recombined wood were studied. The compression deformation of the wood bundle and the bonding mechanism of Huang Jingmu recombined wood were discussed. The effects of different technological factors on the durability of the restructured wood of the Vitex Vitex are tested. The main results of this paper are as follows: (1) the effect of hot pressing time on the TS24h of the recombined wood is generally significant, and the effect on MOR, MOE and IB is not significant. The hot pressing pressure is a very significant influence factor of the Huang Jingmu recombinant MOE. The significant influence factors of MOR, IB and TS24h. When the hot pressure pressure rises from 4 MPa to 6 MPa, the MOE of the Huang Jingmu restructure increases the significant influence of the 26.7%. hot pressing temperature on the MOR of the Huang Jing wood restructure. The effect on MOE, IB and TS24h is not significant. When the hot pressing temperature rises from 150 to 170, the MOR density of the recombined wood of the Yellow wattle is Huang Jing The significant influence factors of MOR and MOE are also significant factors affecting the IB and TS24h of Huang Jingmu. When the density is increased from 0.8g/cm3 to 1.2g/cm3, the MOR and MOE of the recombined materials of Huang Jingmu are increased by 22.1%, 35.2%, and IB by 56.1% respectively, and TS24h reduces the optimum hot pressing process parameters of 55.1%. (2) Huang Jingmu restructure: hot pressing Time 11.2min, hot press pressure 4MPa, hot pressing temperature 160 C, density 1.20g/cm3, when the hot pressing process is used, the MOR of Huang Jingmu restructure is 114 MPa, MOE is 11.33 GPa, IB is 0.92 MPa, TS24h is 8.0%. conform to LYT1580-2010< oriented particleboard. The requirements of 3.5GPa, IB > 0.34MPa, TS24h < 20%. (3) most of the superior properties of Huang Jingmu timber were filled with phenolic gum in most of the catheter and cell cavity. After high temperature and high pressure plate, the internal microstructure remained well. The width of the plate cementing layer with poor performance is far larger than that of the better laminated sheet, and the adhesive layers of the Huang Jingmu recombined materials with poor performance are loosely combined, and the adhesive layers of the better performance of the Huang Jing wood restructure are tightly combined. The C-O-C group is formed in the bonding reaction, C The -O-C group is an important group affecting the bonding properties, and it plays a bond role at the joint of the veneer seams. (4) the internal bonding strength of the aging treatment material is 30.43%-50.00%, the mass increase range is 5%-17%, the thickness increase is 6%-14%, the change amplitude of internal bonding strength is obviously higher than the mass. The density has significant influence on the internal bonding strength, mass percentage and thickness increase percentage of aging treatment material. The effect of hot pressure pressure on internal bonding strength, mass increase percentage and thickness increase percentage is not significant. When the density increases from 0.8 g/cm3 to 1.2 g/cm3, the internal bonding strength decreases. The amplitude is 44%, the decrease of the mass percentage is 8.67%, the decrease of the thickness increase percentage is 5.00%. (5) when the hot pressing temperature is 160 C, the density is 1.20g/cm3, the hot pressing pressure is 4MPa, the hot pressing time is 11.2 min, the aging treatment material has the best durability, the internal bonding strength is 0.64 MPa, the mass increase percentage is 6%, the thickness increases. The addition percentage is 7%, which satisfies the >OSB/3 type board of LYT1580-2010< oriented particleboard (thickness less than 10mm) which stipulates the requirement of IB > 0.15MPa after boiling experiment of wet state bearing plate. (6) the better technical parameters of Huang Jingmu recombined material to obtain the best physical and mechanical properties and durability are 160 C, 1.20g/cm3, hot pressure 4Mpa, heat pressure, 4Mpa, heat. When the pressure time 11.2min. (7) is used as an indoor furniture material, the static flexural strength and elastic modulus of the Huang Jingmu recombined material are larger than that of a few high quality hardwood. However, the density of the Huang Jingmu restructure is also large, and it is suggested to adjust it properly according to the use requirements. When used as the outdoor furniture material, the 2H boiling water of the Huang Jingmu restructure is made after the boiling water. The bonding strength is higher than the particleboard and the medium density fiberboard, lower than the plywood; the thickness increase percentage is lower than the medium density fiberboard, which is higher than that of the reconstituted bamboo. Therefore, the thickness increase percentage of the Huang Jingmu restructure is slightly higher. It is suggested that the transparent coating can be used to finish the surface finishing treatment, which can not only play the role of waterproof, but also keep the natural texture.

【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU531.1

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