Method for preparing biomechanical pulp through wheat straw leaves

Abstract

The invention provides a method for preparing biomechanical pulp through wheat straw leaves. The method comprises the steps that S1, pretreated wheat straw leaves are cut off, water is added, and hotwater treatment is conducted; S2, alkali is added in the mixture obtained after treatment in step S1, the solution pH is adjusted to be 10-14, a small part of hemicellulose, lignin, pectin and other substances are dissolved from the wheat straw leaves, and while the wheat straw leaves are waterlogged and softened, the pH value of wheat straw is controlled to be 7-9 when treatment is finished; S3,an alkaline enzyme is added in the wheat straw obtained after treatment in S2, and enzymolysis treatment is conducted; S4, the wheat straw leaves obtained after enzymolysis treatment in S3 is subjected to grinding treatment, and the biomechanical pulp is obtained. Accordingly, the idea of taking the wheat straw leaves as raw materials is put forward for the first time, a process of cooperating hotwater with alkaline complex enzyme is adopted for preparing the high-yield primary-color biomechanical pulp, and then the requirement of producing primary-color packaging paper and paper-based materials is met. The preparation method is simple, environmental friendliness and cleanliness are achieved, and the method has the good practical application value and industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of papermaking technology and new materials, and in particular relates to a method for preparing biomechanical pulp from wheat grass leaves. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] In 2016, my country's pulp imports reached 21.06 million tons, and waste paper imports reached 28.5 million tons. The import dependence of paper fiber raw materials was close to 50%. The large amount of waste paper made up for the gap in my country's fiber raw materials and supported the development of the paper industry. In April 2017, the central government issued the "Implementation Plan on Prohibiting the Entry of F...

AI Technical Summary

Problems solved by technology

[0004] In the traditional papermaking process in the past, wheat straw straw was used as an important raw material for papermaking, and wheat straw leaves in wheat straw straw were often required to be removed as much as possible during the material preparation process. This is because although wheat straw leaves contain more hemicellulose, they are not easy to beat

Concrete, because the fiber in the wheatgrass leaf is short, and miscellaneous cell content is many, and the outer layer of secondary wall is thicker, and is bonded tighter with the middle layer of secondary wall, so it is difficult to remove in beating process, thus causes fiber Swelling and fibrillation are very difficult

If excessive fine fiberization is required in beating, it will inevitably cause excessive cutting of fibers, which not only affects the strength of paper, but also makes it difficult to filter water during papermaking.

However, removing wheat straw leaves not only increases the cost of material preparation, but also greatly reduces the utilization rate of wheat straw raw materials

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