长余辉发光再生纤维素纤维的制备及性能研究

发布时间：2018-06-15 03:34

本文选题：稀土铝酸锶 + 再生纤维素纤维　；参考：《江南大学》2017年硕士论文

【摘要】：稀土铝酸锶(SrAl_2O_4:Eu~(2+),Dy~(3+))长余辉发光材料因其一定的化学稳定性、发光效果优异而被应用于众多行业。其中,长余辉发光纤维是本课题组研发的,以成纤高聚物(如聚对苯二甲酸乙二醇酯、聚酰胺等)为基材,通过添加SrAl_2O_4:Eu~(2+),Dy~(3+)制备的一种具有自主知识产权的新型功能性纤维。当前,制备长余辉发光纤维主要以熔融纺丝法为主,而溶液纺丝法制备的长余辉发光纤维较少,这是由于SrAl_2O_4:Eu~(2+),Dy~(3+)材料耐水解性差,限定了长余辉发光纤维的制备方法。本文意在采用溶液纺丝法制备一种长余辉发光再生纤维素纤维,首先对SrAl_2O_4:Eu~(2+),Dy~(3+)材料进行硅烷偶联剂KH570包覆处理,然后以再生纤维素为基材,利用溶液纺丝方法制备而成,并对其性能进行研究。具体内容如下:首先,采用硅烷偶联剂KH570对SrAl_2O_4:Eu~(2+),Dy~(3+)进行改性处理以增加稀土铝酸锶发光材料在水性溶液中的稳定性。通过扫描电子显微镜观察改性处理的粉末表面形貌,采用傅里叶红外光谱仪对偶联剂化学键连接进行测试,采用热重分析仪测试接枝在粉末表面的偶联剂含量,并对改性处理的粉末的光学性能进行表征,实验结果显示:激发发射光谱表明包覆前后粉末的激发发射峰保持不变,这就表明偶联剂的加入没有损害粉末的物相结构;余辉测试表明包覆层对发光亮度的影响较小;耐水性测试表明,改性后的粉末可以在水中保持两个小时不变质。其次,以包覆处理的粉末为添加剂,采用低温处理后的碱/尿素/硫脲/水体系溶解的棉浆粕为基材,与添加剂进行物理共混,制得纺丝液。采用注射式溶液纺丝设备制备了长余辉发光再生纤维素纤维。通过制备不同长余辉发光粉末含量的纤维及未包覆粉末的纤维,研究不同长余辉粉末含量对纤维性能的影响及偶联剂对纤维的影响。结果表明,随着长余辉发光粉含量的增加,纤维的外观出现突起和裂缝,形貌变差;力学性能随着粉末含量增加而降低;激发发射光谱及余辉测试表明随着粉末含量的增加,发光强度增加,但是超过10%时,增加幅度较小。另外,通过对比未包覆粉末的纤维,表明偶联剂在纤维中的作用不仅保护了发光粉,也增加了纤维力学强度。此外,当前已经制备出的长余辉发光纤维主要是发黄绿色光,发光光色较为单一。为了丰富纤维的发光光色,以光致变色微胶囊和经处理的稀土铝酸锶为添加材料,采用溶液纺丝法制备出多元光色的长余辉发光再生纤维素纤维,并对纤维的外观形貌、光学性能进行了研究,发现经紫外线激发后,多元光色的纤维发射光谱蓝移,在黑暗时,相对普通长余辉发光纤维的黄绿光其发色呈绿色。
[Abstract]:Rare earth strontium aluminate (SrAl2O2) SrAl2O2) long afterglow materials have been used in many industries because of their chemical stability and excellent luminescence effect. Among them, long afterglow fiber was developed by our group. A new functional fiber with independent intellectual property rights was prepared by adding SrAl2O4: Eustane 2 + Dy3 with fiber forming polymer (such as polyethylene terephthalate, polyamide, etc.) as substrate. At present, the long afterglow fibers are mainly prepared by melt spinning, but few by solution spinning. This is due to the poor hydrolysis resistance of SrAl2O4: EUG / Dy (3) materials, which limits the preparation method of long afterglow fibers. The aim of this paper is to prepare a long-afterglow regenerated cellulose fiber by solution spinning method. Firstly, SrAl2O4: Euf2 / Dy (Dy) 3) material is coated with silane coupling agent KH 570, and then the regenerated cellulose is prepared by solution spinning method. And its performance was studied. The main contents are as follows: firstly, SrAl2O4: Eu2 + Dy3) was modified by silane coupling agent KH 570 to improve the stability of rare earth strontium aluminate luminescent materials in aqueous solution. The surface morphology of the modified powder was observed by scanning electron microscope (SEM). The chemical bond bonding of the coupling agent was tested by Fourier transform infrared spectroscopy (FTIR) and the content of the coupling agent grafted on the powder surface was measured by thermogravimetric analysis. The optical properties of the modified powder were characterized. The experimental results showed that the excitation emission peak of the powder remained unchanged before and after coating, which indicated that the addition of coupling agent did not damage the phase structure of the powder. The results of afterglow test showed that the coating had little effect on luminescence brightness, and the water resistance test showed that the modified powder could remain unchanged in water for two hours. Secondly, using coated powder as additive and cotton pulp dissolved in alkali / urea / thiourea / water system as substrate after low temperature treatment, the spinning solution was prepared by physical blending with additive. Long afterglow regenerated cellulose fibers were prepared by injection solution spinning equipment. The effect of the content of long afterglow powder on fiber properties and the effect of coupling agent on fiber were studied by preparing fibers with different content of long afterglow powder and uncoated powder. The results showed that with the increase of the content of long afterglow powder, the appearance of the fiber appeared protuberance and crack, the morphology became worse, the mechanical properties decreased with the increase of powder content, the excitation emission spectrum and the afterglow test showed that the appearance of the fiber increased with the increase of powder content. The luminous intensity increases, but when it exceeds 10, the increase is small. In addition, by comparing the uncoated fibers, it is shown that the coupling agent not only protects the luminescent powder, but also increases the mechanical strength of the fiber. In addition, the long-lasting phosphorescent fiber is mainly yellowish green and has a single luminous color. In order to enrich the luminous color of the fiber, the multicomponent light-colored long-afterglow regenerated cellulose fiber was prepared by solution spinning with photochromic microcapsule and rare earth strontium aluminate as the additive material, and the appearance and morphology of the fiber were investigated. The optical properties were studied. It was found that the emission spectra of the multicomponent light-colored fibers were blue shifted after UV excitation. In the dark, the yellowish green light of the multicomponent light-colored fibers was green compared with that of the ordinary long-afterglow fibers.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ352.79;TQ422

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