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采用不同配比的已磨或未磨的针叶木和阔叶木漂白硫酸盐浆(分别记为SBKP和HBKP)以及高得率浆(HYP),探讨了阳离子淀粉(CS)或阳离子聚乙烯醇(CPVA)的电荷密度对上述浆料成纸性能的影响。结果表明,为达到阳离子助剂的最佳使用效果,需优化其电荷密度;在已磨SBKP和已磨HBKP各占50%的浆料体系中,添加电荷密度为0.20mmol/g、用量为20mg/g的CS或CPVA,其成纸的抗张强度和耐破度提高显著;当已磨浆料SBKP、HBKP和HYP分别占50%、20%和30%时,添加电荷密度为0.50mmol/g、用量为20mg/g的CPVA,其成纸抗张强度和耐破度同样提高明显(分别提高15%和25%);在上述浆料配比下,采用不同用量的CS或CPVA(其电荷密度均为0.50mmol/g),纸张的松厚度和抗张强度均得到提高;相比于只含50%SBKP和50%HBKP而无阳离子助剂的浆料,含HYP的浆料所成纸张具有更高的抗张强度和松厚度。
The effects of cationic starch (CS) or cationic polyvinyl alcohol (PVA) on the biodegradability of cationic starch (CS) and cationic polyvinylpyrrolidone (PVA) were studied by using bleached and unmilled softwood and hardwood bleached kraft pulp (SBKP and HBKP respectively) CPVA) charge density on the pulp paper performance. The results showed that in order to achieve the best effect of cationic additives, the charge density should be optimized. In the slurry system containing 50% of SBKP and 50% of ground HBKP, the charge density was 0.20mmol / g and the dosage was 20mg / g of CS or CPVA, the tensile strength and bursting strength of the paper increased significantly; when the SBMP, HBKP and HYP accounted for 50%, 20% and 30% respectively, the charge density was 0.50mmol / g, the dosage of CPVA is 20mg / g, the tensile strength and the bursting strength of the paper also increase significantly (respectively 15% and 25%); in the above slurry ratio, using different amounts of CS or CPVA Charge density of 0.50 mmol / g), both the bulk and the tensile strength of the paper are improved; the HYP-containing slurry is formed as compared to the slurry without cationic assist agent containing only 50% of SBKP and 50% of HBKP Paper has higher tensile strength and bulk.