基于粒料法的MDI型聚氨酯分散体的制备与表征

Preparation and Characterization of Polyurethane Dispersions with MDI by Pelleting Process

摘要:

以二苯基甲烷二异氰酸酯(4,4’- MDI)，2，2-二羟甲基丁酸(DMBA)，聚己二酸丁二醇酯(PBA，Mn=3000)，1，4-丁二醇(BG)，三乙胺(TEA)等为原料，采用粒料法制备了聚氨酯分散体(PUD)。研究表明， PUD平均粒径处于59~215nm之间，粒径分布多处于20~200nm范围内；PUD粘度均在960mPa.s以下，随羧基含量的增加而增大；PU粒料的丙酮溶液粘度均在5000mPa.s以上，并随R值[R=n (-NCO)/n(-OH)]的增大，先增大后减小；透射电镜(TEM)显示PUD胶粒呈球形，大小不一；PUD胶膜吸水率均在2%以下。

Abstract:

With Diphenylmethane diisocyanate(4,4，-MDI),2,2-(hydroxymethyl butyric acid(DMBA), poly(1,4-butylene adipate glycol) (PBA ,Mn=3000),1, 4 - butanediol（BG）and triethylamine(TEA), polyurethane dispersions(PUDs) was prepared by pelleting process. Results showed that the average particle sizes and particle size distribution of PUDs were mostly in the range of 59~215nm and 20~200nm respectively. The viscosities of PUDs were mostly less than 960mPa.s and increased with the increased of carboxyl content. The viscosity of PU acetone solutions were greater than 5000mPa.s and had trend of rise-fall with the increase of R value[R= n (-NCO)/n(-OH)]. TEM analysis showed spherical shapes of the particles with different sizes and multivariate distribution. The water absorption of the PUDs films were less than 2%.