人工林杨木增强—染色复合改性工艺研究

发布时间：2018-01-08 03:14

本文关键词：人工林杨木增强—染色复合改性工艺研究　出处：《中国林业科学研究院》2017年硕士论文　论文类型：学位论文

【摘要】：人工林杨木作为三大速生木材之一,资源非常丰富,但是其密度小、强度低、尺寸不稳定、材色单调、花纹不清晰、装饰性差,这些缺陷都大大限制了其应用范围,所以有必要对人工林杨木进行改性处理,以提高其产品附加值和综合利用水平。本论文以毛白杨(Populus tomentosa)为研究对象,以自制水溶性树脂型增强改性剂(MUF)为主剂,研究了水溶性染料、溶液pH值和耐光助剂对复合染色改性材性能的影响,通过正交试验优化了树脂型复合染色剂的制备及处理工艺,对复合染色材的物理力学、颜色和色牢度等性能进行了检测和评价;并利用扫描电镜(SEM)和傅立叶红外光谱(FTIR)等仪器分析初步探讨了树脂型复合染色剂的增强改性机理与染色机制。主要结论如下:(1)通过单因素试验考察不同pH值的树脂溶液与不同染料的复配性状及相应处理材性能,在所选8种染料中筛选出酸性大红G为最佳复配染料,最佳溶液pH值为10。(2)通过单因素试验考察多种单一和复合耐光助剂对复合染色材的增重率、颜色和色牢度等性能的影响,筛选出树脂型复合染色剂的耐光助剂为UV-531和纳米TiO_2复配。(3)以MUF树脂浓度、染料浓度、耐光助剂浓度和树脂固化温度四个因素进行L_9(3~4)正交试验,对树脂型复合染色改性剂的调配及处理工艺进行优化;以浸渍处理后人工林杨木的密度、增重率、颜色、耐水和耐光色牢度等性能为评价指标,对正交试验结果进行极差与方差分析,综合评定出复合染色改性剂的优化工艺为:树脂浓度为30%,染料浓度为1.5%,耐光助剂为0.5%浓度的纳米TiO2和0.5%浓度的UV-531复配,树脂固化温度为100℃。(4)复合染色改性材的性能测试结果表明:与未处理材相比,复合染色改性材的密度提高46.15%,抗弯弹性模量(MOE)提高29.67%,抗弯强度(MOR)提高54.36%,抗胀率(ASE)超过70%;与纯染色材相比,复合染色改性材的颜色更为均匀,色泽更为明亮艳丽;复合染色改性材的耐水色牢度良好,但耐光色牢度有待进一步提高。(5)SEM观察结果表明:复合染色改性剂具有良好的渗透性,能充分浸注到木材的细胞腔与细胞间隙中,复合染色改性材的导管内及细胞壁表面均填充和覆盖着大量树脂。(6)FTIR分析结果表明:复合染色改性材与纯树脂增强改性材的谱图形态基本一致,认为两者的增强改性机理相同,主要是MUF树脂的填充作用和与木材细胞壁物质的交联键合反应使得木材的物理力学性能提高。
[Abstract]:Poplar wood as the three fast-growing wood, very rich in resources, but its low density, low strength and unstable size, color pattern is not clear, monotonous, poor ornamental, these defects have greatly limited its scope of application, so it is necessary to poplar wood was modified to. Increase the added value of their products and the level of comprehensive utilization. In this paper, Populus Tomentosa (Populus tomentosa) as the research object, using self-made water soluble resin reinforced modifier (MUF) as the main agent, the effects of water soluble dye, pH value of solution and light effect of additives on the dyeing performance of modified composite material. Through the preparation and treatment process of resin composite stain orthogonal test, physical mechanics of composite materials and dyeing, color fastness and other properties were tested and evaluated; and using scanning electron microscopy (SEM) and Fu Liye (FTIR) of infrared spectrum analysis instrument The resin composite stain modification mechanism and dyeing mechanism. The main conclusions are as follows: (1) the effects of different pH value of the resin solution and compound characters of different dyes and the corresponding material properties through single factor experiment, the selected 8 kinds of dyes were selected as the best combination of acid red G dye, the best solution the value of pH was 10. (2) were investigated by single factor test of single and compound additives on the composite material of the light staining rate of gain, effects of color and color fastness properties of the selected resin composite dye photostability agent for the compound of UV-531 and nano TiO_2. (3) with MUF resin concentration, dye concentration. Photostability agent concentration and curing temperature of resin four factors were L_9 (3~4) orthogonal test, the deployment and treatment process of resin composite dyeing modifying agent is optimized; with the density of impregnated artificial Lin wood, the weight gain rate, color, water resistance and impact resistance Colour fastness properties such as the evaluation index, analysis of range and variance of orthogonal test results, a comprehensive evaluation of the optimization process of composite dyeing modifying agent for resin concentration is 30%, the dye concentration was 1.5% UV-531 and 0.5% TiO2 nano additives for the light concentration of 0.5% concentrations of the compound, resin curing temperature is 100 degrees centigrade. (4) the performance test results of modified wood composite staining showed that: compared with the untreated wood, composite dyeing of modified wood density increased by 46.15%, modulus of elasticity (MOE) increased by 29.67%, the flexural strength increased by 54.36% (MOR), anti inflation (ASE) more than 70%; compared with the pure dyeing material. Composite dyeing of modified wood color is more uniform, the color is more bright; composite dyeing of modified wood color fastness is good, but the color fastness to light needs to be further improved. (5) the results of SEM showed that the composite dyeing modifying agent has good permeability, can fully impregnated to Interstitial cell and cell cavity in the wood, composite material modified catheter staining and cell wall surface were filled and covered with a lot of resin. (6) the results of FTIR analysis showed that the composite modified material and dyeing of pure resin reinforced modified material spectrum form is basically the same, that enhance the modification mechanism of both that is mainly the crosslinks filling effect of MUF resin and wood cell wall material reaction makes the physical and mechanical properties of wood.

【学位授予单位】：中国林业科学研究院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S781.7

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