| Abstract:Bleached softwood kraft pulp was mercerized in ambient temperature, and the effects of the concentration of alkali liquid and the processing time on the DP of the pulp were explored. And the effects of the mixing ratio of mercerized pulp and softwood pulp, the beating degree of softwood pulp, the kind and dosage of reinforcing agents and the process of pressing and drying on the properties of base paper of air filter paper were further studied. The results indicated that the DP of the mercerized pulp was optimized when the concentration of alkali liquid was 190 g/L and the mercerization time was 45 min. When the dosage of mercerized pulp was 50%, the beating degree of softwood pulp was 22°SR, the CPAM doage was 0.06%, the permeability of the resultant base paper was higher than 100 μm/(Pa·s) and much higher than the industry standard, meanwhile its mechanical properties were well meet the requirements of industry. |
