Do a good job of drying the adhesive, bid farewell to the bag boiled delamination

Do a good job of drying the adhesive, bid farewell to the bag boiled delamination

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We usually only pay attention to the amount of compound sizing. In fact, insufficient drying is often the most direct cause of incomplete curing of the adhesive (insufficient heat resistance of the adhesive layer), delamination and wrinkling quality during poaching.

A small amount of water and alcohol impurities are present in the prepared glue, and good drying property can cause impurities such as moisture in the rubber layer to be volatilized as much as possible, and the consumption of the proportion of the curing agent in the rubber layer is reduced. In order to ensure that the adhesive is fully dry during dry compounding, the following points should be noted:

(1) Drying performance of the equipment itself. Such as the amount of air in and out of the equipment, the length of the oven.

(2) Setting of drying temperature.

1 setting of the drying temperature of the first zone. The concentration of ethyl acetate in the drying medium in the first zone is the highest, so the first zone dryness setting should not be too high (generally not higher than 65 °C). Because the temperature is too high, the surface of the rubber layer is quickly volatilized and crusted, which in turn inhibits the escape of the inner layer solvent in the drying zone of the latter regions.

2 Drying temperature gradient setting. The oven temperature should be set according to the law of gradually increasing gradient. The purpose is to accelerate the diffusion and volatilization of the solvent in the hardened zone and the discharge odor zone, and reduce the solvent residue in the film.

(3) Adjustment of the amount of air in and out.

1 In the evaporation zone of the drying process, the inlet and outlet valves should be opened to the maximum and the return air valve should be closed.

2 In the dry hardening zone and the odor-eliminating zone, the amount of return air can be appropriately increased, and part of the energy consumption can be saved.