Synchronization method for preparing microfibrillated cellulose and application of microfibrillated cellulose in strengthening of paper

Abstract

The invention provides a manufacturing process for an MFC (Microfibrillated Cellulose) product, which can complete the swelling of ZnCl2 and the mechanical dissociation of microfibril synchronously. The manufacturing process has the basic characteristics that the swelling and the mechanical dissociation of the cellulose microfibril in cell walls of plant fibers are completed synchronously by combining moderate mechanical pulping treatment when pulp fibers are subjected to swelling treatment by taking various types of bleaching chemical pulp, mechanical pulp and the plant fibers, such as cotton, hemp and crop straw as main treatment objects and utilizing the ZnCl2 which has a good fiber swelling effect as a main pretreatment agent; the purposes of saving energy, reducing consumption and simplifying a product preparation process flow are achieved; the MFC product can be obtained by performing subsequent treatment, such as high pressure homogenizing, on the cellulose microfibril which are subjected to the dissociation. When the product is applied to a paper production process in pulp and paper making industry, a plurality of quality indexes, such as paper strength and paper optical performance, can be effectively improved, so that the product has a good application prospect.

Description

technical field [0001] The invention belongs to the field of utilization of plant cellulose resources, and relates to a low-energy preparation technology for novel nano-cellulose products. The prepared product can be applied to the enhancement of paper products and the improvement of optical properties in the papermaking industry. Background technique [0002] In 1983, Professor Albin F.Turbak of the Georgia Institute of Technology and others used bleached softwood pulp as raw material to obtain a microfibrillated cellulose product (Microfibrillated) with a width of 5-20nm and a length of about 2000nm after repeated high-pressure homogenization treatments. Cellulose, hereinafter referred to as "MFC"). The dispersion of this product is a stable translucent gel in the concentration range of 0.5-2.0%. It has the appearance characteristics of a colloidal solution, obvious thixotropy and unique high specific surface area, height-diameter-length ratio and other morphological chara...

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Problems solved by technology

[0005] At present, in order to reduce production costs, research institutions at home and abroad are constantly trying different kinds of plants such as cotton, hemp, and wheat straw in addition to bleached wood pulp raw materials. Fiber raw materials are used for the production of MFC. These agricultural by-products of non-wood plant lignin have less content and are easy to remove. The cellulose microfibrils are easy to be separated under the condition of less energy consumption; in the pretreatment stage, in addition to the traditional In addition to the mechanical beating treatment, domestic and foreign tend to use acid, alkali and organic solvents to pretreat the fiber raw materials, open the hydrogen bonding between the microfibrils, and prepare MFC under the condition of lower energy consumption, but this process will produce A large amount of acid, alkali and impurities, the later separation process is complicated, and the water consumption is high. It is still in the stage of laboratory theoretical research.

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