柠檬酸化壳寡糖改性水性聚氨酯的合成与性能
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摘要
以异佛尔酮二异氰酸酯(IPDI)与聚四氢呋喃醚二醇(PTMG-2000)为主要原料,二羟甲基丙酸(DMPA)为亲水扩链剂,柠檬酸化壳寡糖(CA-COS)为改性剂,合成了柠檬酸化壳寡糖型水性聚氨酯(CCOS-WPU)。以乳液和胶膜的基本性能为指标,对反应条件进行了优化,通过傅里叶变换红外光谱对胶膜的结构进行了表征,用X射线衍射和热重分析对胶膜的结晶度和热稳定性进行了分析。结果表明,当n(NCO)∶n(OH)为4∶1,DMPA用量为5.0%,CA-COS用量为1.0%时,CCOS-WPU乳液粒径为57.57 nm,CCOS-WPU乳液及胶膜的综合性能较好,相比未改性的WPU,胶膜的拉伸强度从15.84 MPa提高到16.34 MPa,CA-COS的加入可使聚氨酯的结晶能力下降,耐热性明显提高。
Chitosan-citrate based waterborne polyurethane(CCOS-WPU) emulsion was prepared with isophorone diisocyanate(IPDI) and poly tetrahydrofuran ether glycol(PTMG) as main raw material, dimethylolpropionic acid(DMPA) as hydrophilic chain extender, chitosan citrate(CA-COS) as modifier. Based on the basic properties of emulsions and films, the reaction conditions were optimized. The structure of film was characterized by FT-IR and the crystallinity and thermal stability of WPU and CCOS-WPU films were studied by X-ray diffraction(XRD) and thermogravimetric analysis(TGA). The results show that the comprehensive properties of CCOS-WPU emulsions and films are better when the n(NCO)∶n(OH) is 4∶1, the dosage of DMPA is 5.0% and CA-CCOS dosage is 1.0%. The particle size of CCOS-WPU emulsion is 57.57 nm. Compared with non-modified WPU, the tensile strength of CCOS-WPU film increases to 16.34 MPa from 15.84 MPa. Meanwhile, the addition of CA-COS can significantly improve the heat resistance and decrease the crystallinity of CCOS-WPU films.
Chitosan-citrate based waterborne polyurethane(CCOS-WPU) emulsion was prepared with isophorone diisocyanate(IPDI) and poly tetrahydrofuran ether glycol(PTMG) as main raw material, dimethylolpropionic acid(DMPA) as hydrophilic chain extender, chitosan citrate(CA-COS) as modifier. Based on the basic properties of emulsions and films, the reaction conditions were optimized. The structure of film was characterized by FT-IR and the crystallinity and thermal stability of WPU and CCOS-WPU films were studied by X-ray diffraction(XRD) and thermogravimetric analysis(TGA). The results show that the comprehensive properties of CCOS-WPU emulsions and films are better when the n(NCO)∶n(OH) is 4∶1, the dosage of DMPA is 5.0% and CA-CCOS dosage is 1.0%. The particle size of CCOS-WPU emulsion is 57.57 nm. Compared with non-modified WPU, the tensile strength of CCOS-WPU film increases to 16.34 MPa from 15.84 MPa. Meanwhile, the addition of CA-COS can significantly improve the heat resistance and decrease the crystallinity of CCOS-WPU films.
引文
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[5] Wang Y X,Tian H F,Zhang L.Role of starch nanocrystals and cellulose whiskers in synergistic reinforcement of waterborne polyurethane [J].Carbohydr.Polym.,2010,80:665-671.
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[8] 崔文慧.不同辐照剂量壳聚糖酰化改性产物的结构和性质比较[D].北京:中国农业科学院,2016.Cui W H.Structures and properties of chitosan acylation products after irradiation with different doses [D].Beijing:Chinese Academy of Agricultural Sciences,2016.
[9] Zhang Y Q,Kang Q W,Wu Z.Preparation and prorerties analysis of waterborne sidechain fluorinated polyurethane [J].Paint & Coatings Industry,2012,42(5):41-43.
[10] 侯彩英,周艳明,韩艾洁.亲水基团含量对水性聚氨酯耐水性能的影响研究[J].应用化工,2012,41 (12):2131-2134.Hou C Y,Zhou Y M,Han A J.Influence of hydrophilic group content on the water resistance of waterborne polyurethane [J].Applied Chemical Industry,2012,41 (12):2131-2134.
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