發(fā)布時間：2018-04-05 08:01

  本文選題：陽離子水性聚氨酯　切入點：制備　出處：《武漢紡織大學(xué)》2017年碩士論文

【摘要】：陽離子水性聚氨酯在其主鏈或側(cè)鏈上帶有陽離子基團,賦予陽離子水性聚氨酯與其它水性聚氨酯不同的優(yōu)異功能,但陽離子基團提供水性聚氨酯良好的自乳化性的同時,也降低了聚氨酯膠膜的耐水性。本課題制備出具備良好穩(wěn)定性的陽離子水性聚氨酯,同時改善了陽離子水性聚氨酯膠膜的耐水性和柔軟性。本課題對聚氨酯膠膜彈性、延伸性、耐水增重率、接觸角、熱重分析、結(jié)構(gòu)表征進行了測試與評價;同時,對聚氨酯乳液穩(wěn)定性進行測試,包括貯存穩(wěn)定性、高溫穩(wěn)定性、凍融穩(wěn)定性、電解質(zhì)穩(wěn)定性、耐酸堿穩(wěn)定性以及稀釋穩(wěn)定性等,還對乳液粒徑及其分布等進行了測試。本課題合成了聚酯型、聚醚型聚氨酯,分別用不同含量的有機硅化合物、自主設(shè)計制備的有機硅化合物、硬脂酸單甘油酯(GMS)對陽離子水性聚氨酯進行改性,最后研究了不同含量親水性擴鏈劑對水性聚氨酯性能的影響。試驗表明:聚酯型聚氨酯的乳液穩(wěn)定性良好,但膠膜的力學(xué)性能、耐水性和拒水性較差;聚醚型聚氨酯的膠膜的力學(xué)性能和耐水性良好,但乳液高溫穩(wěn)定性、耐酸堿穩(wěn)定性和拒水性差。聚酯二醇(PE2348)與聚醚三醇(ZC330)混合雙軟段合成水性聚氨酯,m(PE2348):m(ZC330)≥1:1時,有利于乳液穩(wěn)定性的提高、粒徑的減小、膠膜接觸角的提高,但m(PE2348):m(ZC330)比值的增大會降低膠膜耐水性,同時力學(xué)性能變差,TG顯示耐熱穩(wěn)定性變差。羥烴基聚硅氧烷(PPC)改性導(dǎo)致聚酯型聚氨酯乳液變黃,耐水性和力學(xué)性能變差;但wt(PPC)≤11%對聚醚型聚氨酯改性效果較好,可提高乳液的穩(wěn)定性、耐水性和拒水性,改善手感,但力學(xué)性能變差。自制有機硅聚合物(PS)改性聚氨酯,能改善膠膜手感和耐水性,但膠膜力學(xué)性能和乳液穩(wěn)定性變差。以硬脂酸單甘油酯(GMS)對聚氨酯進行改性后,接入量wt.3%,膠膜手感滑爽,耐水性變好,但力學(xué)性能變差,同時聚酯型聚氨酯膠膜拒水性變好,但乳液穩(wěn)定性變差;聚醚型聚氨酯乳液穩(wěn)定性變好,但拒水性變差。親水性擴鏈劑(N120)的引入會降低聚氨酯的耐水性和拒水性。N-甲基二乙醇胺(MDEA)含量為6%~7%時,粒徑最小為61nm,拒水性較大,MDEA含量的升高會降低膠膜的耐水性。
[Abstract]:Cationic waterborne polyurethane has cationic group on its main chain or side chain, which endows cationic waterborne polyurethane with different functions from other waterborne polyurethane, but the cationic group provides good self-emulsifying property of waterborne polyurethane.It also reduces the water resistance of polyurethane film.In this paper, cationic waterborne polyurethane with good stability was prepared, and the water resistance and softness of cationic waterborne polyurethane film were improved.In this paper, the elasticity, extensibility, water resistance, contact angle, thermogravimetric analysis and structure characterization of polyurethane film were tested and evaluated, and the stability of polyurethane emulsion was tested, including storage stability and high temperature stability.Freezing and thawing stability, electrolyte stability, acid and alkali resistance and dilution stability were tested. The particle size and distribution of emulsion were also measured.Polyester polyurethane and polyether polyurethane were synthesized in this paper. Cationic waterborne polyurethane was modified by organic silicon compounds with different contents, organic silicon compounds designed by ourselves and glycerol monostearic acid monoglyceride (GMSs).Finally, the effects of different hydrophilic chain extenders on the properties of waterborne polyurethane were studied.The results showed that the emulsion of polyester polyurethane had good stability, but the mechanical property, water resistance and water repellency of the film were poor, the mechanical property and water resistance of polyurethane film of polyether type were good, but the emulsion was stable at high temperature.Acid and alkali stability and water repellency are poor.鑱氶叝浜岄唶(PE2348)涓庤仛閱氫笁閱，

本文編號：1713877