This invention relates to a composition for a preparation of polyurethane dispersion, comprising bio-based polyol as shown in structure (I) and polyhydroxy fatty acid compound as shown in structure (II): wherein, R represents a polyhydric alcohol unit that is selected from aliphatic polyhydric alcohol, alicyclic polyhydric alcohol, cyclic polyhydric alcohol, aromatic polyhydric alcohol, or optionally, cyclic polyhydroxyl having heteroatom; R\ represents a hydrocarbon unit obtained from a molecular chain of unsaturated fatty acid having 14-24 carbon atoms and having from 1-6 pairs of vicinal diol group per one molecular chain of such unsaturated fatty acid; n represents an integer from 2 to 8 of an ester group obtained from a reaction of polyhydric alcohol and unsaturated fatty acid; wherein said composition is prepared from a process comprising the steps of: i. mixing fatty acid comprising unsaturated fatty acid and polyhydric alcohol at a ratio of 1 mole equivalent or more of carboxylic group from unsaturated fatty acid per a hydroxy group from polyhydric alcohol; ii. adding organic acid and peroxide compound into the mixture from step i.; iii. adding nucleophilic substance into the mixture from step ii. under acidic condition.
本发明涉及一种用于制备聚
氨酯分散体的组合物,该组合物由结构(I)所示的
生物基多元醇和结构(II)所示的多羟基
脂肪酸化合物组成:其中,R 代表选自脂肪族多羟基化合物、脂环族多羟基化合物、环状多羟基化合物、芳香族多羟基化合物或可选的具有杂原子的环状多羟基化合物的多羟基单元;R 代表从具有 14-24 个碳原子的不饱和
脂肪酸分子链中获得的烃单元,该不饱和
脂肪酸的每一条分子链中具有 1-6 对邻位二元醇基团;n 代表从多元醇和不饱和
脂肪酸反应中获得的酯基的 2 到 8 的整数; 其中,所述组合物是由包括以下步骤的工艺制备的:i.将包含不饱和
脂肪酸和多羟基
乙醇的
脂肪酸以不饱和
脂肪酸的羧基与多羟基
乙醇的羟基 1 摩尔当量或更高的比例混合; ii.