Preparation method of ultrahigh-hardness hydroxy acrylic resin and product thereof

The invention discloses a preparation method of ultrahigh-hardness hydroxy acrylic resin and a product thereof. The preparation method comprises the following steps: adding a solvent into a reaction kettle; raising the temperature in the reaction kettle to 165 to 175 DEG C; dropwise adding an acrylic acid mixed monomer and an initiator into the reaction kettle; carrying out heat preservation under the condition of 165-175 DEG C; supplementing an initiator, and keeping the temperature; the temperature in the reaction kettle is reduced to 95-105 DEG C, the solvent is supplemented, and the solid content is adjusted to 68-72%; and cooling to 55-65 DEG C, adding the semi-methylated amino resin, the curing agent and the acid catalyst into the reaction kettle, uniformly mixing, and then packaging. The solid content of the ultrahigh-hardness hydroxyl acrylic resin is 68-72%, the viscosity is 7000-12000 cps, the hydroxyl value is 165 mgKOH/g, the hardness is 2H, no scratch is generated, the problem that existing hydro