Composite material capable of writing black handwriting repeatedly and preparation method thereof

• Main Authors: SUN WEINA, WANG HONGZE, MA CHAO, XI GUAN, GAO WENBIN, ZHANG XIAO'AN, HUANG HAISHUI, MA YUFEI, LU ZHIKAI, SHENG LAN, PANG YAXUAN, LI MIAO, LI JIANPING
• Format: Patent
• Language: Chinese; English
• Published: 29.06.2018
• Subjects: ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CORRECTING FLUIDS; DYES; FILLING PASTES; GENERAL PROCESSES OF COMPOUNDING; INKS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS THEREFOR; WOODSTAINS; WORKING-UP

The invention provides a composite material capable of writing black handwriting repeatedly and a preparation method thereof. The composite material is prepared from a base material layer and a coating layer composited on the base material layer, wherein coating liquid is prepared from, in parts by weight, 0.01-10 parts of pigment, 20-200 parts of organic solvents, 5-500 parts of water, 0.1-30 parts of functional assistants and 1-50 parts of binding agents. The composite material can be used for writing, drawing and printing. The coating layer can display black color when meeting with a colordeveloping water agent, the handwriting is clear, the contrast ratio is high, the coating layer can recover to the initial state after the water agent evaporates, the no-ground-color effective writingstate can be maintained as long as 20 days, and the repeated using frequency can reach 200 times or above. According to the composite material, the color developing speed of the coating layer is fast, the film forming perform