Method for preparing high-whiteness chemical pulp and paper products thereof by using corn stalk

Abstract

The invention discloses a preparation method of chemical pulp with high whiteness by corn stalks and paper product, wherein steaming adopts soda cooking by adding anthraquinones and surface-active material; bleaching adopts totally-chlorine-free bleaching of short program of OPAPO in the pulp making processes, wherein OP segment is oxygenic delignification segment reinforced by small amount of hydrogen peroxide; A segment is acid treatment segment; PO> is oxygen-reinforced hydrogen peroxide bleaching segment. The preparation method of chemical pulp with high whiteness by corn stalks and paperproduct has the advantages of less steaming time, high steaming and bleaching efficiency, free of chlorine and chlorine compounds while bleaching, high whiteness and strength of the paper pulp, energy saving, water saving, low production cost, and favorableness to environmental protection. In addition, with whiteness rate of above 85% ISO, the paper pulp made from corn stalks is able to be made into high-grade cultural paper and paperboard as well as paper and paperboard with high sanitary indexes replacing bleached hardwood pulp or bleached hardwood pulp mixed with bleached softwood kraft pulp.

Description

Preparation method of high whiteness chemical pulp and its paper products from corn stalks technical field The invention belongs to the technical field of non-wood fiber pulping and papermaking, and relates to a method for pulping and papermaking from corn stalks, in particular to a method for preparing high-whiteness chemical pulp and its paper products from corn stalks. Background technique China is a large agricultural country, and corn is one of the main crops. There are about 150 million tons of corn stalks in the country every year. According to statistics, 40% of this straw is used by farmers as living fuel and livestock feed, and the remaining 60% is discarded or burned on the spot, which not only causes serious environmental pollution, but also causes a great waste of resources. For a long time, in order to solve the shortage of wood fiber raw materials for papermaking, my country's paper industry has actively carried out the research and development of some non-...

AI Technical Summary

Problems solved by technology

The disadvantages of this pulping method are: the raw materials used are only limited to the use of depilled corn stalk raw materials; the paper pulp obtained by cooking with the ammonium method is not easy to bleach; when carrying out PEOT bleaching, due to the high amount of alkali (6% ~ 10%), although this is beneficial to delignification, but at the same time it will cause the pulp to turn yellow

The bleaching temperature used is low (55-95°C), and it is not easy to improve the whiteness of pulp

In addition, because there is no acid treatment section in the bleaching program, the bleaching is always carried out under alkaline conditions, and it is not easy to remove metal ions and colored substances