碱处理影响纸浆纤维润胀程度的响应曲面优化

Optimization of Influences of Alkali Treatment on Pulp Fiber Swelling Degree via Response Surface Methodology

由于天然纤维素自身的结构限制,纤维素资源每年的利用量与天然合成量相比相差甚远,大部分未能有效利用.通过NaOH水溶液预处理,纤维润胀使得纤维微纤丝间结合力减弱,是提高纤维素利用率的有效途径之一.该文采用响应曲面法分析温度、时间、碱浓度对纤维润胀程度的影响,探究碱预处理对纤维结构的影响.研究表明:对纤维进行碱预处理,通过响应曲面分析,得出影响纤维润胀程度的3种主要因素的影响程度的顺序为反应温度>反应时间>碱浓度.优化工艺条件得到的最佳工艺条件为:碱液质量分数为8.5%,温度为-5℃,时间为13 h,得到纤维保水值为178.65%.碱处理可以有效地削弱纤维微纤丝间的氢键结合,改善纤维化学改性的反应性能,从而实现纤维素纤维的解离与高效利用.

The supramolecular structure of cellulose fiber limits its efficient utilize.Annual utilization of cellulose resources is far from the natural synthesis.Pretreatment with NaOH aqueous solution,binding force between fiber microfibrils can be weaken through fiber swelling,which is one of the effective ways to improve the utilization of cellulose fibers.In this paper,response surface method was used to analyze the influence of temperature,time and alkali concentration on fiber swelling degree,and to explore the influence of alkali pretreatment on fiber structure.The results showed that quadratic model was the best model to describe the relationship between fiber swelling degree with the three factors above.The optimal process conditions were treating with 8.5%alkali concentration at-5 C for 13 h.The water retention value of fibers was 178.65%.Alkaline treatment can effectively weaken the hydrogen bonding between the fiber microfibrils,improve the reaction performance of the chemical modification of the fiber,and realize the dissociation and efficient utilization of cellulose fiber.