▎ 摘　　要

NOVELTY - Preparation of whiteboard paper containing graphene heat-conducting layer with ink absorbing performance involves (1) preparing graphene permeable core layer paper layer and graphene permeable type surface layer paper layer, (2) sizing, (3) forming the graphene permeable core layer paper layer and the graphene permeable type surface layer paper layer through a two-layer net, facing the composite microporous filter membranes of graphene permeable core layer paper layer and graphene permeable type surface layer paper layer outside when forming, post-pressing after molding, peeling off filter membrane layer and drying to form base paper, (4) detecting the surface properties of the base paper to judge the surface flatness of the base paper, adjusting the parameters in the previous process when it is not flat, (5) compounding the bottom of the base papers to form an oil-paper layer, (6) surface sizing, post-drying, calendaring, coating, drying and shaping. USE - Preparation of whiteboard paper containing graphene heat-conducting layer with ink absorbing performance. ADVANTAGE - The method adopts the mode of vacuum filtration to adsorb graphene oxide on the inner layer paper base of whiteboard paper. The surface layer and inner layer surface graphene also redistributes graphene due to the suction filtration method, which improves the uniformity of graphene release. In this method, real-time detection of the surface shape of the inner paper base during production. The method produces product with improved printing surface performance and excellent three-dimensional thermal conductivity. DETAILED DESCRIPTION - Preparation of whiteboard paper containing graphene heat-conducting layer with ink absorbing performance involves (1) preparing graphene permeable core layer paper layer and graphene permeable type surface layer paper layer, (2) sizing, (3) forming the graphene permeable core layer paper layer and the graphene permeable type surface layer paper layer through a two-layer net, facing the composite microporous filter membranes of graphene permeable core layer paper layer and graphene permeable type surface layer paper layer outside when forming, post-pressing after molding, heating the rollers to 60-85degrees Celsius under 75-100 MPa, peeling off the filter membrane layer and drying to form base paper, (4) detecting the surface properties of the base paper to judge the surface flatness of the base paper, adjusting the parameters in the previous process when it is not flat, (5) compounding the bottom of the base papers to form an oil-paper layer, (6) surface sizing on the base paper passed through step (5) at sizing amount of 1-2 g/m2, post-drying, calendaring, feeding to coating system to complete the coating, (7) drying the paper coated in step (6) through a hot air drying oven and shaping. The graphene permeable core layer paper layer and graphene permeable type surface layer paper layer are prepared by (A1) configuring core layer slurry and surface layer slurry, feeding to headbox to form core layer wet paper base and surface layer wet paper base, pre-pressing the core layer wet paper base and the surface layer wet paper base with barbed press rolls, making its moisture content to 60-65%, forming core layer wet paper base and surface layer wet paper base with evenly arranged holes on their surfaces, ultrasonically processing graphene oxide dispersion liquid to obtain uniformly dispersed graphene suspension, adding to the obtained core layer wet paper base and the surface layer wet paper base, pre-evaporating to water content of 64-68% and drying, increasing the tension of the core wet paper base and the surface wet paper base with moisture content of 68-72%, compounding the core layer wet paper base and the surface layer wet paper base respectively with microporous filter membrane, feeding into suction filtration device, and partially penetrates the graphene oxide dispersion liquid on the top of the core layer wet paper base and the surface layer wet paper base into interior and back of the paper base from the holes on the surface of the paper base. In step (2), sizing is carried out on the side of the core layer of the wet paper-based non-microporous filter membrane.