有机颜料改性处理及其在木塑复合材料中的应用

发布时间：2018-06-03 13:52

本文选题：木塑复合材料 + 有机颜料　；参考：《福建农林大学》2017年硕士论文

【摘要】：有机颜料是木塑复合材料(简称WPC)着色研究的主要着色剂之一,但有机颜料存在分散性差、耐候牢度不佳等问题,而对其进行改性处理是解决此问题的重要手段之一。本文首先以联苯胺黄G12(P.Y.12)为着色剂,研究茶梗粉、杉木粉以及竹粉3种木质原料填充高密度聚乙烯(HDPE)复合材料的力学性能和着色性能,并分别以酞菁蓝15:3(P.B.15:3)、P.Y.12、颜料红48:2(P.R.48:2)对复合材料进行着色处理,探讨颜料种类及其添加量对复合材料弯曲性能和表观颜色的影响;在此基础上,分别采用溶胶-凝胶法制备的纳米Si02及其与含氢硅油(PMHS)复合、硅铝凝胶对P.Y.12进行改性处理,通过FTIR、SEM观察以及热重分析表征其改性效果,同时采用改性颜料着色复合材料并进行紫外加速老化试验,探讨颜料改性对材料弯曲性能、热稳定性、表观颜色以及耐老化性能的影响。论文的主要结论如下:(1)茶梗粉、杉木粉与竹粉为填料分别与HDPE复合制备的WPC,其弯曲性能的大小次序为杉木粉/HDPE复合材料竹粉/HDPE复合材料茶梗粉/HDPE复合材料,且材料的外观颜色变化均较明显;3种有机颜料(P.B.15:3、P.Y.12、P.R.48:3)分别着色杉木粉/HDPE复合材料后,总色差△E*随颜料添加量的增加而增大;无论WPC是否着色处理,随紫外老化时间延长,材料表面裂隙增加,弯曲性能降低,明度指数L*与△E*均增大;但与未着色材料相比,颜料加入后使WPC的弯曲性能略有提高,且材料的耐紫外老化性能较好。(2)对溶胶-凝胶法制备的纳米SiO2及其与PMHS复合改性P.Y.12后的SEM观察、粒径测试及热分析表明,纳米SiO_2改性后颜料粒径增大,且耐热性能提高,但纳米SiO2与PMHS复合改性后,粒径较前者有所减小,改性使颜料的分散稳定性能提高。(3)纳米SiO2及其与PMHS复合改性的P.Y.12对WPC弯曲性能的影响较小,热分析表明当WPC中添加10%纳米SiO2改性颜料时其热稳定性能有较明显提高;紫外加速老化试验表明,添加10%纳米SiO2及其与PMHS复合改性颜料使WPC老化后弯曲性能的变化最小;WPC的总色差△ E*的变化也均小于添加未改性的颜料,其中20%纳米SiO2改性颜料对材料老化过程中颜色的稳定效果最好。(4)采用研磨法用硅铝凝胶对P.Y.12进行改性后,颜料粒径增大,但耐热性能提高不明显;改性颜料着色WPC后,其弯曲性能有所增大但变化总体较小,而WPC的L*、b*增加,其中经6%与9%硅铝凝胶改性后,b*分别较对照增加了 4.67%与5.63%;紫外加速老化试验表明,相同的老化时间内,硅铝凝胶改性颜料使WPC弯曲性能的降低幅度及其△ E*的变化幅度基本上小于添加未改性的颜料,其中9%硅铝凝胶改性颜料使WPC在老化期间△ E*的变化最小,对颜色的稳定效果较好。
[Abstract]:Organic pigments are one of the main coloring agents for wood plastic composites (WPC), but organic pigments have some problems such as poor dispersion and poor weathering fastness. The modification of organic pigments is one of the important methods to solve this problem. In this paper, the mechanical properties and coloring properties of high density polyethylene (HDPE) composites filled with tea stalk powder, Chinese fir powder and bamboo powder were studied with benzidine yellow G12P P.Y.12 as colorant. The composite was colored with phthalocyanine blue 15: 3 P.B.15: 3 and pigment red 48: 2 P.R. 482, respectively. The effects of pigment type and its addition on the bending properties and apparent color of the composite were discussed. Nano-sized Si02 prepared by sol-gel method and its composite with hydrogen-containing silicone oil (PMHS) were used to modify P.Y.12. The modification effect was characterized by FTIR SEM observation and thermogravimetric analysis. The effects of pigment modification on the flexural properties, thermal stability, apparent color and aging resistance of pigments were investigated by using modified pigment coloring composites and UV accelerated aging test. The main conclusions of the paper are as follows: tea stalk powder, Chinese fir powder and bamboo powder were mixed with HDPE respectively. The order of bending properties of WPCs was as follows: Chinese fir powder / HDPE composite bamboo powder / HDPE composite tea stalk powder / HDPE composite. The total color difference (E *) of three organic pigments, P.B.15: 3 and P.Y.12P.R. 483, increased with the increase of pigment content, whether or not the pigments were colored or not, and the total color difference increased with the increase of UV aging time, whether or not the pigments were colored by P.B.15: 3 / P.Y.12P.R. 483 respectively, and the total color difference (E *) increased with the increase of the amount of pigments added. The surface cracks increased, the bending properties decreased, the luminance indices L * and E * increased, but compared with the uncolored materials, the flexural properties of WPC increased slightly after the addition of pigments. The ultraviolet-resistant aging property of the material was good. (2) the SEM observation of nanometer SiO2 prepared by sol-gel method and its composite modified P.Y.12 with PMHS, the particle size test and thermal analysis showed that the particle size and heat resistance of nano-SiO_2 modified pigment were increased. However, the particle size of nano-sized SiO2 and PMHS was smaller than that of the former, and the dispersion and stability of the pigment was improved by the modification. The effect of nano-SiO2 and P.Y.12 modified with PMHS on the flexural properties of WPC was less than that of Nano SiO2. Thermal analysis showed that the thermal stability of the modified pigment was obviously improved when 10% nanometer SiO2 was added to WPC, and the UV accelerated aging test showed that the thermal stability of the pigment was improved. The addition of 10% nano-sized SiO2 and its composite modified pigment with PMHS resulted in the smallest change in flexural properties of WPC after aging, and the change of total color difference E * of WPC was also smaller than that of unmodified pigment. Among them, 20% nano-sized SiO2 modified pigments have the best color stabilization effect during aging. 4) after modified P.Y.12 by grinding method, the particle size of the modified pigment increases, but the heat resistance is not improved obviously, and after the modified pigment is colored with WPC, the particle size of the modified pigment increases, and the heat resistance of the modified pigment is not improved obviously after the modified pigment is colored with WPC. The flexural properties of WPC were increased, but the overall change was small, while the content of WPC increased by 4.67% and 5.63% respectively after modified by 6% and 9% Si-Al gel, and the UV accelerated aging test showed that, in the same aging time, the UV accelerated aging test showed that after modified with 6% and 9% Si-Al gel, the flexural properties increased by 4.67% and 5.63%, respectively. Si-Al gel modified pigment can reduce the bending property of WPC and the change of E *, and the change of E * is smaller than that of unmodified pigment, among them, 9% Si-Al gel modified pigment makes the change of E* of WPC during aging to be the smallest. The stable effect on color is better.
【学位授予单位】：福建农林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ616.8;TB332

【参考文献】