蓖麻油改性的含酮羰基聚氨酯分散体的合成及性能研究

Synthesis and Properties of Castor Oil-Modified and Ketone Containing Polyurethane Dispersion

以自制双[4-(2-羟基丙氧基乙酰丙酸酯)]苯基丙烷(BHLPP)、4,4'-二环己基甲烷二异氰酸酯(HMDI)、二羟甲基丙酸(DMPA)、聚己二酸新戊二醇酯(PNA)、蓖麻油(CO)、己二酸二酰肼(ADH)为主要原料,合成了CO改性的含酮羰基聚氨酯分散体(PUD)。利用红外光谱对涂膜结构进行表征。研究了R值(nNCO/nOH)、亲水单体DMPA含量、CO的添加量以及BHLPP的用量对PUD乳液及涂膜性能的影响。结果表明,CO和BHLPP改性PUD可提高涂膜的耐水性、耐溶剂性、硬度和耐热性。当R值为1.8,DMPA含量为24 mmol?(100 g resin)?1,CO添加量为13.5 g?(100 g resin)?1,BHLPP的用量为12.9 g?(100 g resin)?1时合成的PUD具有优异的耐水性、耐溶剂性和耐热性,硬度达2 H。

A castor oil-modified and ketone containing polyurethane dispersions （PUDs） were obtained using 2,2-bis（4-（2-hydroxypropoxy levulinate）phenyl）-propane （BHLPP）, 4,4-methylenedicyclohexyl diisocyanate （HMDI）, dimethylolpropionic acid （DMPA）, polyneopentylene adipate glycol （PNA）, castor oil （CO） and adipic dihydrazide （ADH） as raw materials. PUD films were characterized by ATR-FTIR. Effects of molar ratio of NCO/OH, DMPA, CO and BHLPP contents on dispersion and film properties were investigated. The results show that water resistance, solvent resistance and mechanical properties are enhanced with the increase of CO and BHLPP contents. When nNCO/nOH, DMPA content, CO content and BHLPP content are 1.8, 24 mmol.（100 g resin）-1, 13.5 g.（100 g resin）-1 and 12.9 g.（100 g resin）-l, respectively, the castor oil-modified and ketone containing PUD has good resistance to water, solvent and heat. The pencil hardness of the film reaches to 2 H.