摘要
以聚四氢呋喃二醇、聚己二酸丁二醇酯、端羟基硅烷和异佛尔酮二异氰酸酯等为主要原料,以2,2-二羟甲基丙酸和磺酸型扩链剂为亲水扩链剂,采用自乳化和外乳化相结合的方法合成阴离子型高固含量水性聚氨酯乳液。考察了预聚时间、有机硅加量、乳化剂和扩链剂含量、R值(NCO/OH)等对乳液和成膜性能的影响。通过红外光谱、热重分析对改性前后水性聚氨酯结构进行表征。结果表明:预聚时间为2.0～2.5h,磺酸型扩链剂含量为0.27%,外乳化剂用量为1.6%,R=1.3,有机硅含量为2.5%时,能得到固含量53%、黏度低,稳定性、耐水性、耐热性优异的水性聚氨酯乳液。
The high performance and high solid WPU was synthesized by combining the emulsification and the self - emulsion method, with polytetrahydrofuran glycol（PTHF） ,polyester （PBA）, hydroxyl- containing silicone （8427） and isoflurane ketone diisocyanate（IPDI） as the main raw material, the DMPA and sulfonate hydrophilic as chain extender. The processing conditions which can influence the quality of WPU emulsion and film were studied, such as the molar ratio of NCO/OH, the amount of sili- cone and the amount of chain extender. The structure of the product before and after adding silicone were characterized and compared by The Fourier Transform Infrared （FTIR） and TGA. The results show that when the Prepolymer time is 2.0 - 2.5 h, the content of sulfonated chain extender is about 0.27%, and the emulsification is 1.6%, R is 1.3 and the content of silicone is 2. 5%, the low viscosity, good stability, good capability of water resistance WPU emulsion whose solid content is 53% can be synthesized.
出处
《中国皮革》
CAS
北大核心
2011年第21期5-8,共4页
China Leather
关键词
高固含量
磺酸型扩链剂
水性聚氨酯
有机硅
high solid waterborne polyurethane
sulfonate hydrophilic chain extender
waterborne polyurethane
organic silicone
