阴离子型含硅水性聚氨酯壁材相变储能微胶囊的制备与性能
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1.安徽建筑大学安徽省先进建筑材料重点实验室,安徽 合肥 230022;2.1.安徽职业技术学院建筑工程学院,安徽 合肥 230061;3.2.安徽建筑大学安徽省先进建筑材料重点实验室,安徽 合肥 230022

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TQ314.2

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国家自然科学基金面上资助项目(51573001);安徽省高校自然科学研究项目(KJ2020A1033,KJ2021A1445);安徽省高校优秀青年人才支持计划(gxyq2022250)


Preparation and Properties of Phase Change Energy Storage Microcapsules with Silicon-Containing Anionic Waterborne Polyurethane as Shell Material
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    摘要:

    采用端羟基硅油(PDMS-OH)引入聚氨酯预聚体链段,利用二羟甲基丙酸(DMPA)为亲水扩链剂制备了阴离子型含硅水性聚氨酯预聚体,再将其与三缩丙二醇二丙烯酸酯(TPGDA)聚合用以包覆石蜡芯材,获得阴离子型含硅水性聚氨酯壁材相变储能微胶囊材料,并且分析了PDMS-OH与聚醚多元醇(PPG2000)对相变储能微胶囊各项性能的影响。结果表明,PDMS-OH已成功接入聚氨酯预聚体主链,且壁材已成功包覆石蜡芯材,PDMS-OH的引入有助于提高壁材的机械强度,提高了相变储能微胶囊的芯材包覆率,其中PDMS-OH/PPG2000摩尔比为90:10时,熔融焓为157.25J/g,结晶焓为183.17J/g,石蜡含量达75.43%;并且有助于减小乳液中乳胶束的粒径,其中最小粒径为181.45nm,从而大幅改善微胶囊芯材外泄的问题;另外,随着PDMS-OH/PPG2000摩尔比的提高,一段分解失重率下降幅度增大,表明芯材包覆率进一步提高,其中PDMS-OH/PPG2000摩尔比为90:10时,一段失重率达73.40%。

    Abstract:

    Anionic silicon-containing waterborne polyurethane prepolymer was prepared by introducing hydroxyl terminated silicone oil ( PDMS-OH ) into polyurethane prepolymer chain segment and using dimethylol propionic acid (DMPA) as hydrophilic chain extender. The anionic silicon-containing waterborne polyurethane prepolymer was polymerized with propylene glycol diacrylate (TPGDA) to encapsulate paraffin core material, and the phase change energy storage microcapsule material of anionic silicon-containing waterborne polyurethane shell material was obtained. The effects of PDMS-OH and polyether polyol (PPG2000) on the properties of phase change energy storage microcapsule were analyzed. The results show that PDMS-OH had been successfully incorporated into the main chain of polyurethane prepolymer, and the shell material had been successfully coated with paraffin core material. The introduction of PDMS-OH improved the mechanical strength of the shell material, and the core material encapsulation rate of phase change energy storage microcapsules was improved. Of the PU90/10 MicroPCMs, the melting enthalpy was 157.25 J/g, the crystallization enthalpy was 183.17 J/g, and the paraffin content was 75.43%. The introduction of PDMS-OH also reduced the particle size of the latex beam in the emulsion, and the minimum particle size was 181.45 nm, which greatly reduced the leakage of the microcapsule core material. In addition, with the increase of PDMS-OH / PPG2000 molar ratio, the weight loss rate of the first stage decomposition increased, and the weight loss rate of PU90 / 10 MicroPCMs was 73.40 %, which indicated that the coating ratio was further improved.

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  • 收稿日期:2022-06-09
  • 最后修改日期:2022-09-19
  • 录用日期:2022-09-21
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