Method for cationization of surface of microcapsule with urea resin as capsule wall

• Main Authors: DONG CUIHUA, DENG HAIBO, LONG ZHU, YANG SHUHUI
• Format: Patent
• Language: Chinese; English
• Published: 23.05.2012
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; IMPREGNATING OR COATING OF PAPER; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; WORKING-UP

The invention relates to a method for cationization of a surface of a microcapsule with a urea resin as a capsule wall by utilizing epoxypropyltrimethyl ammonium chloride, comprising the following steps: at room temperature, adding the microcapsule with the urea resin as the capsule wall and NaOH in a dispersed solvent and evenly stirring; adding the epoxypropyltrimethyl ammonium chloride in the mixed solution and heating the reaction system up to 60-70 DEG C and reacting for 60-120min to obtain a coarse microcapsule product having the cationic surface; placing the coarse microcapsule producthaving the cationic surface in an ethanol solution to be washed, filtering, changing a fresh ethanol solution to wash and filter the coarse microcapsule product, and repeating the operations for manytimes; and after washing, drying for 8-15h in a vacuum dryer to obtain the finished microcapsule product having the cationic surface. The invention improves the retention of the reversible thermochromatic microcapsule in paper