▎ 摘　　要

NOVELTY - Formaldehyde-resistant color steel plate comprises a metal substrate (1) and a primer (2), and a topcoat (3) and a graphene aqueous varnish (4) sequentially arranged on one side of the metal substrate. The other side of the metal substrate is provided with a back paint (5), and the graphene water-based varnish includes 60-70 wt.% aqueous acrylic emulsion, 3-7 wt.% film-forming aid, 3-7 wt.% graphene dispersion, 13-17 wt.% nano titanium dioxide, 1.5-2 wt.% additives and 100 wt.% water. USE - Formaldehyde-resistant color steel plate used in field of building, home appliance, and automobile, and used in emulsion paint field. ADVANTAGE - The plate has good anti-formaldehyde effect and small influence to the mechanical property of the raw coiled material effect. The paint layer of the color steel plate is provided with a layer of graphene aqueous varnish, where the nano-titanium dioxide in the graphene dispersion liquid is coordinated with the graphene, which can obtain good anti formaldehyde effect, and the thickness of the paint film after the cleaning film is small, for the plate of the surface hardness, (T), and has small influence on the normal performance such as acid and alkali resistance. The coating can be formed by the metal substrate of the heating substrate itself, dry increasing the additional oven, with good operability and economical efficiency. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation method of formaldehyde-resistant color steel plate, which involves taking metal base material and carrying out chromium-free passivation treatment, obtaining pretreatment coil, coating primer, topcoat and back paint on the pretreatment coil to obtain coating coil, coating the graphene aqueous varnish on the coating coil, and drying with the waste heat of the coating coil to obtain a formaldehyde-resistant color steel plate. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the anti-formaldehyde color steel plate. Metal substrate (1) Primer (2) Topcoat (3) Graphene aqueous varnish (4) Back paint (5)