SUPER-ABSORBENT POLYMER AND PREPARATION METHOD THEREFOR

• Main Authors: LEE, Soo Jin, SOHN, Jung Min
• Format: Patent
• Language: English; French; Korean
• Published: 16.05.2019
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

The present invention relates to: a super-absorbent polymer having excellent basic absorption performance and also being capable of improving rewetting characteristics and leakage suppression characteristics of a sanitary product such as diapers; and a preparation method therefor. The super-absorbent polymer comprises: a base resin powder comprising a first cross-linked polymer of a water-soluble ethylenically unsaturated monomer having an acidic group of which at least a part is neutralized; and a surface cross-linked layer comprising a second cross-linked polymer in which the first cross-linked polymer is additionally cross-linked with a surface cross-linking agent as a mediator, wherein the surface cross-linking agent comprises a mixture of multiple types of cyclic alkylene carbonates, and the mixture has a Hansen solubility parameter, due to a hydrogen-bonding component, of 13 or greater. La présente invention concerne : un polymère superabsorbant possédant une excellente performance d'absorption de base et pouvant également améliorer les caractéristiques de réhumidification et les caractéristiques de suppression de fuite d'un produit sanitaire tel qu'une couche ; et un procédé de préparation associé. Le polymère superabsorbant comprend : une poudre de résine de base comprenant un premier polymère réticulé d'un monomère éthyléniquement insaturé soluble dans l'eau possédant un groupe acide dont au moins une partie est neutralisée ; et une couche de surface réticulée formée sur la poudre de résine de base et comprenant un deuxième polymère réticulé formé par réticulation supplémentaire médiée par un agent de réticulation de surface du premier polymère réticulé, l'agent de réticulation de surface comprenant un mélange de multiples types de carbonates d'alkylène cycliques et le mélange possédant un paramètre de solubilité de Hansen, dû à un constituant de liaison à l'hydrogène, de 13 ou plus. 본 발명은 기본적인 흡수 성능이 우수할 뿐 아니라, 기저귀 등 위생재의 리웻(rewet) 특성 및 누수 억제 특성을 향상시킬 수 있는 고흡수성 수지 및 이의 제조 방법에 관한 것이다. 상기 고흡수성 수지는 적어도 일부가 중화된 산성기를 갖는 수용성 에틸렌계 불포화 단량체의 제 1 가교 중합체를 포함하는 베이스 수지 분말; 및 상기 베이스 수지 분말 상에 형성되어 있고, 상기 제 1 가교 중합체가 표면 가교제를 매개로 추가 가교된 제 2 가교 중합체를 포함하는 표면 가교층을 포함하는 고흡수성 수지로서, 상기 표면 가교제는 복수종의 고리형 알킬렌 카보네이트의 흔합물을 포함하고, 상기 혼합물은 수소 결합 성분 (hydrogen bonding component)에 의한 한센 용해도 파라미터 (Hansen solubility parameter)가 13 이상인 것이다.