The invention discloses water-soluble
rosin resin and a preparation method and application thereof. The water-soluble
rosin resin comprises the following raw materials in parts by weight: 80 to 100 parts of maleated
rosin, 35 to 75 parts of PEG200, 10 to 50 parts of
citric acid and 0.1 to 0.2 part of a catalyst. The preparation method of the water-soluble rosin resin comprises the following stepsof melting the maleated rosin, adding the PEG200 and the catalyst, and performing a reaction at 180-250 DEG C for 1-8 hours to obtain maleated rosin
polyethylene glycol ester; and adding the
citric acid into the maleated rosin
polyethylene glycol ester, and performing a reaction at 150-180 DEG C for 1-6 hours to obtain the water-soluble rosin resin. Water and an alkali solution are added into thewater-soluble rosin resin, the pH value is adjusted to 7-8 to obtain a rosin-based fruit and vegetable
preservative, and the surfaces of
fruits and vegetables are coated with the obtained rosin-basedfruit and vegetable
preservative. The water-soluble rosin resin disclosed by the invention is low in
raw material preparation cost, easy to dissolve in the alkali solution, good in
solubility, easy toclean and beneficial to guarantee of cleanness of the
fruits and vegetables, and the water-soluble rosin resin disclosed by the invention is safe and reliable in component, belongs to the non-toxic grade, and is good in film-forming property and bright and durable in color and luster.