MANUFACTURING METHOD OF ANIONIC WATER-DISPERSIBLE POLYURETHANE DISPERSION AND BIODEGRADABLE POLYURETHANE FILM PREPARED THEREFROM

• Main Authors: SHIN EUN JOO, LEE SOO YOUNG, KWAK HA NEUL, LEE GYU RI
• Format: Patent
• Language: English; Korean
• Published: 04.10.2022
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

The present invention relates to a method for preparing an anionic water-dispersible polyurethane dispersion and a biodegradable polyurethane film prepared from the dispersion. The method for preparing an anionic water-dispersible polyurethane dispersion comprises: a raw material mixing step of stirring isophorone diisocyanate dropwise while stirring castor oil and dimethylolbutanoic acid; a urethane synthesis step of mixing and synthesizing acetone in a mixture prepared through the raw material mixing step; a neutralization step of performing neutralization by mixing triethylamine after cooling urethane synthesized through the urethane synthesis step; a distilled water stirring step of adding and stirring distilled water to the neutralized urethane through the neutralization step; and an acetone removal step of removing the acetone contained in the urethane mixed with distilled water through the distilled water stirring step. According to the anionic water-dispersible polyurethane dispersion prepared through the steps, the acetone is used as a viscosity control agent and natural ingredients are used as a chain extender, without using a catalytic agent harmful to the human body. Therefore, a polyurethane film exhibiting excellent biodegradability, mechanical properties and transparency is provided. 본 발명은 음이온성 수분산 폴리우레탄 분산액의 제조방법 및 그 분산액으로 제조된 생분해성 폴리우레탄 필름에 관한 것으로, 케스터오일과 디메틸올부탄산을 교반하면서 이소포론디이소시아네이트를 적하하여 교반하는 원료혼합단계, 상기 원료혼합단계를 통해 제조된 혼합물에 아세톤을 혼합하고 합성하는 우레탄합성단계, 상기 우레탄합성단계를 통해 합성된 우레탄을 냉각한 후에 트리에틸아민을 혼합하여 중화하는 중화단계, 상기 중화단계를 통해 중화된 우레탄에 증류수를 투입하고 교반하는 증류수교반단계 및 상기 증류수교반단계를 통해 증류수가 혼합된 우레탄에 함유된 아세톤을 제거하는 아세톤제거단계로 이루어진다. 상기의 과정을 통해 제조되는 음이온성 수분산 폴리우레탄 분산액은 인체에 해로운 촉매제를 사용하지 않으면서도, 점도조절제로 아세톤을 사용하고 사슬확장제로 천연성분을 사용하여 우수한 생분해성, 기계적 물성 및 투명도를 나타내는 폴리우레탄 필름을 제공한다.