【摘要】 用聚四氢呋喃醚二醇(PTMG)、异佛尔酮二异氰酸酯(IPDI)、间苯二甲基异氰酸酯(mXDI)、二羟甲基丙酸(DMPA)为预聚物反应单体,以2-[(2-氨基乙基)氨基]乙磺酸钠(A95)和乙二胺为扩链剂,利用预聚体分散法制备高固含水性聚氨酯(WPU)消光树脂乳液及胶膜,分析了乳液表观黏度、乳化工艺、R值[n(—NCO)∶n(—OH)]、磺酸盐扩链剂的用量等因素对乳液固含量的影响,探讨了环氧改性高固含水性聚氨酯消光树脂的性能。当乳化转速为3 500 r/min左右,中和度为90%左右,R值为1.9时,A95含量为30%时,环氧树脂含量为7.5%时,能够制得固含量为40%以上的WPU乳液稳定性好,性能优异。更多还原

【Abstract】 A high solid content and low gloss waterborne polyurethane( WPU) has been prepared by prepolymer dispersing process with isophorone diisocyanate( IPDI),1,3-xylylene diisocyanate( m-XDI) and polytetramethylene glycol( PTMG) as main materials,and dimethylol propionic acid( DMPA) as hydrophilic chain extender,and 2-[( 2-aminoethyl) amino]ethanesulfonic sodium( A95) and ethylene diamine as small molecule chain extender. The influence of apparent viscosity,the emulsion process,R value and A95 content on the solid content of WPU is discussed. Meanwhile,the performance of high solid and low gloss WPU is investigated. When the rotating speed is 3 500 r / min,the neutralization degree is about 90%,R value is 1. 9,A95 content is 30%,the epoxy resin content is 7. 5%,a WPU emulsion with a solid content of 40%,good stability and excellent performance can be obtained.更多还原