구조적으로 착색된 필름 및 안료의 제조 방법

• Main Authors: BAUMBERG JEREMY J, PARKER RICHARD, VIGNOLINI SILVIA, DE VOLDER MICHAEL, DROGUET BENJAMIN E, LIANG HSIN LING, FRKA PETESIC BRUNO
• Format: Patent
• Language: Korean
• Published: 27.05.2024
• Subjects: ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DERIVATIVES THEREOF; DYES; GENERAL PROCESSES OF COMPOUNDING; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PERFORMING OPERATIONS; POLISHES; POLYSACCHARIDES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

본 발명은 중화된 셀룰로스 나노결정과 같은 셀룰로스 나노결정을 포함하는 구조적으로 착색된 필름, 입자 및 간섭 안료를 제조하는 방법에 관한 것이다. 필름 및 입자는 다양한 적용을 위한 간섭 안료 또는 글리터와 같은 착색 입자로서 사용될 수 있다. 방법은 셀룰로스 나노결정을 포함하는 나노결정 현탁액을 기판 상에 증착시키는 단계; 스프레더(spreader)를 사용하여 기판 전체에 나노결정 현탁액을 스프레딩하는 단계; 나노결정 현탁액을 숙성(ageing)시켜, 증착 및 스프레딩 동안 손실된 콜레스테릭(cholesteric) 구조를 부분적으로 또는 완전히 회복하는 단계; 증착된 나노결정 현탁액을 건조시켜 나노결정이 자가-조립되어 구조적으로 착색된 필름을 형성하는 단계; 및 구조적으로 착색된 필름을 어닐링하여 필름의 내수성을 증가시키는 단계를 포함한다. 구조적으로 착색된 필름은 구조적 색상을 제공하기 위해 키랄 네마틱(chiral nematic) 구조로 조직화된 나노결정을 포함한다. The invention relates to a method for producing structurally coloured films, particles and interference pigments comprising cellulose nanocrystals, such as neutralised cellulose nanocrystals. The films and particles can be used as interference pigments or coloured particles such as glitters for various applications. The method comprises steps of depositing a nanocrystal suspension comprising cellulose nanocrystals onto a substrate: spreading the nanocrystal suspension across the substrate using a spreader: ageing the nanocrystal suspension to partially or completely recover the cholesteric structures lost during deposition and spreading: drying the deposited nanocrystal suspension so that the nanocrystals self-assemble to form a structurally coloured film: and annealing the structurally coloured film to increase the water resistance of the film. The structurally coloured film comprises nanocrystals which are organized into chiral nematic structures to provide the structural colour.