The invention discloses a preparation method of an optical
adhesive. The preparation method comprises steps as follows: S1, three raw materials including
shellac,
rosin and
calcium carbonate powder are taken respectively according to the designed matching ratio; S2,
rosin is heated to be molten,
shellac is added, the mixture is stirred with a stirring rod, and a
mixed solution A is obtained; S3,
calcium carbonate powder is added to the
mixed solution A, and a
mixed solution B is obtained; S4, the mixed solution B is poured into an accommodating tank and cooled to the
room temperature, and the optical
adhesive can be obtained. The optical
adhesive has the characteristics of being low in cost, high in
adhesion strength, convenient to use, free of
toxicity and
pollution, easy to clear and the like; when a
crystal blank is required to be taken down by removing the adhesive, the adhesive can be directly and integrally torn down or can be directly and integrally torn down after heating and
softening, the adhesive cannot adhere to the surface of the
crystal blank, the cleanliness of the surface of the
crystal blank is kept better, the adhesive is convenient and efficient to use, and besides, the adhesive is lower in loss, can be repeatedly used and is suitable for
processing.