Optimization of technical parameters for making light-basis-weight and environment-friendly rice straw fiber film

Abstract: In order to provide theoretical basis and technical support for the production of biodegradable fiber mulch film, which can meet the requirements of organic cultivation of crops, experiments were conducted using rice straw fiber as raw material, with the clean pulping and papermaking process, and adding commercial pulp and functional additives to analyze the optimal combination of process parameters for the preparation of the manufacturing 55g/m2 light-basis-weight and environment-friendly degradable rice straw fiber film. The optimization of the technological parameters effect on the mulching was studied by the method of the central composite quadratic orthogonal rotational optimizing experiment. Beating degree, ratio, rosin, bauxite, and wet strength agent were selected as input variables, and dry tensile strength, wet tensile strength, and bursting strength were used as response functions. Experimental results indicated that: 1) According to the response surface diagram, the positive effect of ratio on dry tensile strength and wet tensile strength was higher than that of rosin, the effect of ratio on dry tensile strength and wet tensile strength was higher than that of bauxite, and the effect of wet strength agent on dry tensile strength and wet tensile strength was higher than that of rosin. Therefore，the order of contribution rate of each factor to dry tensile strength and wet tensile strength were ratio, wet strength agent, bauxite, beating degree, and rosin. 2) The effect of ratio on bursting strength was higher than that of rosin, the effect of bauxite on bursting strength was higher than that of rosin, and the effect of wet strength agent on bursting strength was higher than that of rosin. Therefore，the order of contribution rate of each factor to bursting strength was ratio, bauxite, wet strength agent, rosin, and beating degree. 3) An optimum technology parameters of 55 g/m2 light-basis-weight and environment-friendly degradable rice straw fiber film was beating degree 31°~48°SR, ratio 45%~50%, rosin 1.2%, bauxite 6%, and wet strength agent 2.0%, in this case, dry tensile strength of 55g/m2 light-basis-weight and environment-friendly degradable rice straw fiber film was higher than 32 N, wet tensile strength higher than 12 N, and bursting strength higher than 100 kPa, and the film met the mechanical property requirements for field mulching. 4) Manufacturing film samples were accorded to the optimal process results, that were beating degree 40°, mixing ratio 45%, rosin 1.2%, bauxite 6%, and wet strength agent 2.0%. Evaluation indicators were separately determined and taken 10 parallel verifications. Experimental results indicated that the dry tensile strength was 33.4 N, the wet tensile strength was 11.9 N and the bursting strength was 137 kPa. The results were correct and credible. According to the standard of tensile strength and bursting strength, manufacturing 55g/m2 light-basis-weight and environment-friendly degradable rice straw fiber film was feasible.