Preparation and property of PVA-based colorful coating composite reinforced with silica aerogel particles filled by high-loaded flame retardant

IF 2.2 4区化学 Q3 CHEMISTRY, PHYSICAL Colloid and Polymer Science Pub Date : 2024-07-10 DOI:10.1007/s00396-024-05292-5

Yilin Feng, Ran Xu, Ying Li, Beibo Zhang, Jiali Wang, Zhi Chen, Luoxin Wang, Hua Wang

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Abstract

Hydrophilic mesoporous silica aerogel particles were synthesized via self-assembly of amphiphilic polymer (Ph8-PEG6-PEOS) and its instantaneous hydrolysis and condensation in the alkaline environment. Meanwhile, the capture and encapsulation of flame retardant (IPPP) and oil soluble dyes were successively completed during the two processes above. Observed by thermal field scanning electron microscopy (TFESEM), the average diameter of aerogel particles reached about 10 µm. BET surface area analysis displayed that the existence of oil-phase component (IPPP) can result in the expansion of pore diameter, and promote the evolution of mesopores into macropores. Then, IPPP@SiO₂ aerogel particles were utilized to improve the flame retardancy of polyvinyl alcohol (PVA) coatings implemented onto cotton yarns, by employing developed knife coating procedure in an aqueous suspension. The thermal stabilities and flammability behaviors of the samples were evaluated by thermogravimetric analysis (TGA), limiting oxygen index (LOI), and vertical burning test, respectively. Both thermal decomposition temperature and LOI value of coating composites gradually increased with the increment of IPPP@SiO₂-n (n = 10, 30, 50, 70), attaching to the synchronous advancement in stretching property. Furthermore, coatings were thickened by degrees from 0.4 to 4 mm, based on knife coating in multi-stage layer-by-layer mode, to build an ordered porous structure with the assisted adhesion of PVA. The following sintering preserved the close packing of silica aerogel particles and facilitated the formation of a coherent porous monolithic material with excellent thermal insulation performance.

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高负载阻燃剂填充二氧化硅气凝胶颗粒增强的 PVA 基多彩涂料复合材料的制备与性能

通过两亲性聚合物（Ph8-PEG6-PEOS）的自组装及其在碱性环境中的瞬时水解和缩合，合成了亲水性介孔二氧化硅气凝胶颗粒。与此同时，阻燃剂（IPPP）和油溶性染料的捕获和封装也在上述两个过程中相继完成。通过热场扫描电子显微镜（TFESEM）观察，气凝胶颗粒的平均直径约为 10 微米。BET 表面积分析表明，油相成分（IPPP）的存在会导致孔径扩大，并促进中孔向大孔演化。然后，通过在水悬浮液中采用开发的刀涂程序，利用 IPPP@SiO2 气凝胶颗粒提高了聚乙烯醇（PVA）涂层在棉纱上的阻燃性。样品的热稳定性和可燃性分别通过热重分析（TGA）、极限氧指数（LOI）和垂直燃烧试验进行了评估。涂层复合材料的热分解温度和 LOI 值都随着 IPPP@SiO2-n （n = 10、30、50、70）的增加而逐渐升高，这与拉伸性能的同步提高有关。此外，基于多级逐层模式的刀涂，涂层厚度从 0.4 毫米到 4 毫米不等，在 PVA 的辅助粘附下建立了有序的多孔结构。随后的烧结保留了二氧化硅气凝胶颗粒的紧密堆积，促进了具有优异隔热性能的多孔整体材料的形成。

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来源期刊

Colloid and Polymer Science 化学-高分子科学

CiteScore

4.60

自引率

4.20%

发文量

111

审稿时长

2.2 months

期刊介绍： Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.