Method for preparing biobased reinforcing filler by utilization of papermaking black liquor

Abstract

The invention relates to a method for preparing a biobased reinforcing filler by the utilization of papermaking black liquor. the method comprises the following steps: Step 1, fetching papermaking black liquor, adopting an acid precipitation method, precipitating, drying, and grinding to obtain a lignin fibre powder filler with the particle size of 20-50 microns; Step 2, pouring the lignin fibre, a weather-proofing agent, an antioxidant, a lubricant and a surfactant into a mixer, and stirring at the stirring speed of 400-800 r / min for 2-3 min; and Step 3, pouring reinforced fibers into the blends obtained in the step 2, and stirring at the stirring speed of 300-600 r / min for 30-90 s. In comparison with the prior art, the method for preparing the biobased reinforcing filler by the utilization of papermaking black liquor has the following beneficial effects: the biobased reinforcing filler has advantages of good heat resistance, low water absorption, good reinforced effect, easy dispersion and the like, and is more beneficial to application and promotion.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a method for preparing bio-based reinforcing filler by using papermaking black liquor. Background technique [0002] my country's papermaking black industry mainly uses various wood and herbaceous plants as raw materials to manufacture pulp, which produces a large amount of papermaking black liquor and causes environmental pollution. At present, most of the papermaking black liquor is treated by concentrating the papermaking black liquor and mixing it with the coal powder of the power plant for incineration, which produces white mud and causes secondary pollution. [0003] At present, most of the existing technologies focus on improving the lignin extraction method and process of papermaking black liquor, such as Chinese patent applications CN200610116148.7, CN201220516116.7, and CN201310076120.5. The existing technology ignores the disadvantages of lignin fiber's own properti...

AI Technical Summary

Problems solved by technology

The existing technology ignores the disadvantages of the lignin fiber itself, such as: poor heat resistance, easy to degrade and carbonize during processing; hygroscopicity, easy to absorb water, inconvenient to use and store; the reinforcement effect is not ideal

These limits the large-scale promotion and marketization of lignin fibers, and most of them can only stay in the laboratory stage

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