First, resolve the resorcinol with a small amount of water, and then dilute to the specified concentration with water. Then, formaldehyde is added and a sodium hydroxide solution is added under slow stirring to control the pH between 8 and 10, which is the phenolic resin mother liquor. Thereafter, the phenolic mother liquor and the latex are uniformly mixed under slow agitation, allowed to stand at room temperature for 12 to 24 hours, and then diluted with water to a predetermined concentration before use. The mixing speed during mixing is too fast, and the latex is prone to gelation.
The phenolic mother liquor of the natural latex must be allowed to stand for a certain period of time before being mixed with the latex. The ripening conditions are 25 ° C X (6 ~ 8) h or 20 ° C X 18 ho or the adhesive layer will lose the adhesion. The phenolic mother liquor used to synthesize the latex can be mixed with the latex without aging. However, all dipping solutions must be matured before they can be used.
