Modified alkyd resin as well as preparation method of alkyd resin and double-component matte white finish

The invention provides a modified alkyd resin and a preparation method thereof. The preparation method of the modified alkyd resin comprises the following step of: enabling an alcohol acid mixture to react to obtain the modified alkyd resin, wherein the alcohol acid mixture comprises the following components in parts by weight: 210-220 parts of soya-bean oil acid, 250-270 parts of phthalic anhydride, 5-7 parts of maleic anhydride, 15-20 parts of neopentyl glycol, 135-150 parts of pentaerythritol, 0.5-1 part of color-reducing antioxidant, 15-20 parts of water-carrying agent, 255-280 parts of diluted solvent, 0.5-1.5 parts of anti-aging agent and 60-76 parts of a compound as shown in formula (I), wherein n is not less than 1 and not more than 4. The compound as shown in the formula (I) is used for modifying the alkyd resin, so that the alkyd resin with a formaldehyde removing function is obtained. The invention further provides double-component matte white finish with an excellent formaldehyde removing function