有机可逆热致变色复配物及其微胶囊化研究

发布时间：2018-01-15 08:09

本文关键词：有机可逆热致变色复配物及其微胶囊化研究　出处：《天津大学》2015年硕士论文　论文类型：学位论文

【摘要】：有机可逆热致变色材料是一类特殊功能型材料,其颜色随温度的变化而改变。但此类材料易受外界环境影响,热稳定性和耐酸碱性较差,而采用微胶囊技术在一定程度上可以解决这些问题,这拓展了此类材料的应用领域。本论文首先对ODB-1、双酚AF和二苯甲酮为变色体系的有机可逆热致变色复配物进行DSC、FT-IR和XRD分析,判断其变色机理为分子间电子得失机理。然后对二苯甲酮复配物微胶囊化,并进行性能测试。制备过程中选用的芯材质量比为m1(ODB-1):m2(双酚AF):m3(二苯甲酮):m4(1,10-癸二醇)=1:2:30:8,壁材选用脲醛树脂,采用质量分数为3wt%的阿拉伯胶作为乳化剂,制得微胶囊的平均粒径为3.15μm。其中脲醛树脂预聚体的最佳制备工艺条件为:尿素与甲醛的摩尔比为1:1.9,预聚pH值为8.0,反应温度为70oC,预聚时间为1h。微胶囊形成阶段控制终点pH值为2.5,酸性催化剂选用NH4Cl。性能测试结果表明微胶囊化可以有效的提高有机可逆热致变色复配物的热稳定性和耐酸碱性等性能,且不影响其变色性能。以脲醛树脂为壁材,采用原位聚合法分别对以水杨酸苯酯和十八醇为溶剂的复配物进行微胶囊包覆,优化了制备过程中的工艺条件。水杨酸苯酯复配物微胶囊制备工艺中选用的芯材质量比为m1(ODB-1):m2(双酚AF):m3(水杨酸苯酯):m4(十八醇)=1:2:60:4。乳化剂选择4wt%SMA(pH=4)/4wt%SMA(pH=3.5)/1wt%SAS配合使用,乳化搅拌速率为3000rpm。得到的微胶囊粒径分布较均匀且不黏连,平均粒径为4.02μm。十八醇复配物微胶囊制备工艺中选用的芯材质m1(ODB-1):m2(双酚AF):m3(十八醇)=1:2:60,最佳乳化剂为1wt%(SDS/Tween-80)/8wt%SMA(pH=4)。且乳化剂与芯材的质量比为6:1,乳化转速为10000rpm时,制得的微胶囊平均粒径为3.28μm,粒径分布也较均匀,符合实际应用的要求。
[Abstract]:Reversible organic thermochromic material is a kind of special functional material, its color changes with temperature changes. But this kind of material is easily affected by the environment, thermal stability and corrosion resistance is poor, while the use of micro capsule technology to a certain extent, these problems can be solved, which extend the application field of this kind of materials. Firstly, ODB-1, bisphenol AF and two benzophenone organic reversible thermochromic system of photochromic compound of DSC, FT-IR and XRD analysis, determine the discoloration mechanism for electronic and molecular mechanism. Then the two benzophenone compound microcapsule, and performance testing. The preparation process the core material mass ratio of M1 (ODB-1): M2 (bisphenol AF): m3 (two BP): M4 (1,10- decanediol) =1:2:30:8, wall material selection of UF resin, the mass fraction of 3wt% in Arabia was used as the emulsifier was prepared, the average particle size of microcapsules was 3.1 The best 5 m. urea formaldehyde resin prepolymer preparation conditions were: the molar ratio of urea and formaldehyde is 1:1.9 prepolymer pH value is 8, the reaction temperature is 70oC, prepolymerization time 1h. microcapsule formation phase control end point pH value is 2.5, the performance of NH4Cl. acid catalyst test results shows that the micro capsule can effectively improve the thermal stability and acid and alkali resistance and other properties of reversible organic thermochromic compound, and does not affect its photochromic properties. Using urea formaldehyde resin as wall material polymerization respectively for phenyl salicylate and eighteen alcohol as the solvent mixture into microcapsules by in situ preparation technology in the process of optimization. Saloi compound microcapsule preparation technology in the selection of the core material mass ratio of M1 (ODB-1): M2 (bisphenol AF): m3 (phenyl salicylate): M4 (eighteen alcohol) =1:2:60:4. 4wt%SMA (pH=4) /4wt%SMA emulsifier (pH=3.5) with /1wt%SAS Use, stirring rate is 3000rpm. the microcapsule particle size distribution is not uniform and adhesion, the average particle size of 4.02 M. eighteen alcohol compound microcapsule preparation technology in the selection of the core material of M1 (ODB-1): M2 (bisphenol AF): m3 (eighteen alcohol) =1:2:60, the best emulsifier 1wt% (SDS/Tween-80) /8wt%SMA (pH=4). And the quality of emulsifier and core material ratio was 6:1, the emulsifying speed is 10000rpm, the microcapsules with an average diameter of 3.28 mu m, particle size distribution is more uniform, meets the requirement of practical application.

【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB34

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