Gradient resin, preparation method therefor and use thereof

A gradient resin, which is formed by merging different layers with color transition change and wherein by mass percentage, raw materials from which the gradient resin is prepared are composed of 98-99.99% of a resin powder and 0.01-2% of a pigment;

• wherein a change percentage of a mass content of the pigment in the raw materials between two adjacent layers is 5-20%;
• wherein a particle size of the resin powder in the raw materials is 0.1-200 μm;
• and
• wherein the resin powder comprises any one or a mixture of at least two of poly(methyl methacrylate), poly(ethyl methacrylate), poly(propyl methacrylate), poly(n-butyl methacrylate), poly(isobutyl methacrylate), poly(hexyl methacrylate), poly(dicyclopentenyl methacrylate), poly(tetrahydrofurfuryl methacrylate), poly(2-hydroxyethyl methacrylate), poly(glycidyl methacrylate), poly(lauryl methacrylate), poly(cyclohexyl methacrylate), poly(benzyl methacrylate), poly(allyl methacrylate), poly(2-ethoxyethyl methacrylate), methoxy polyethylene glycol methacrylate, poly(glycerol methacrylate), poly(isobornyl methacrylate), polyvinyl chloride, polystyrene, polyoxymethylene, polyacetaldehyde and polyurethane;
• wherein the gradient resin has a luminous transmittance of more than or equal to 50%, a flexural strength of more than 100 MPa, a Vickers hardness of more than 20 HV, a water absorption value of less than 25 μg/mm3, and a solubility value of less than 5 μg/mm3.