Method for repairing secondary fiber or recycled fiber keratinization

Abstract

The invention discloses a method for repairing secondary fiber or recycled fiber keratinization.The secondary fiber or the recycled fiber is added into an alkali urine solution which has been pre-cooled to a low temperature, then a regeneration liquid is added to reconstitute the fiber hydrogen bond network and repair keratinization, filtered, repeatedly washed to be neutral, so that a fiber pulpis obtained.The repairing method breaks through atraditional partial repairing method, such as pulping, chemical additives, physical grading and mixing, and the like, and has advantages of simplein repair process, mild in condition and thorough in repair. Water retention value after secondary / recycled fiber repair with different reuse times can reach 131.01%-145.57%,which is equivalent to or slightly higher than that of primary fiber, corresponding to having carrying outreversal repair of the keratinization of the secondary fiber or the recycled fiber, so that the process can prolong life cycle of the secondary fiber or the recycled fiber, providing a brand-new technique for pulpand papermaking technology to improve the water retention value of the secondary fiber or the recycled fiber.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking, and particularly relates to a repair technology for hornyization of secondary fibers or recycled fibers, which improves the water retention value of secondary fibers or recycled fibers, improves the mechanical properties of paper, and prolongs the production of secondary fibers or recycled fibers. Circular life cycle of fibers. Background technique [0002] Waste paper, also known as secondary fiber or recycled fiber, is a huge amount of recyclable resources. Making full use of it can not only save a lot of plant fiber raw materials, reduce production costs, but also reduce municipal solid waste emissions ,reduce environmental pollution. According to Environmental Protection Agency (EPA) statistics, using secondary / recycled fiber to produce paper can save 50% of water consumption and reduce air pollution by 74% compared with virgin fiber production. In my country, secondary / recy...

AI Technical Summary

Problems solved by technology

At present, there are many technical solutions for repairing fiber "keratinization", improving fiber swelling ability, and increasing water retention value, such as mechanical beating or refining, adding chemicals, physical classification of coarse and fine fibers, and mixing virgin fibers. To a certain extent, the fiber swelling ability can be improved, and the degree of fiber keratinization can be improved; however, these methods only compensate and repair fiber keratinization by increasing the active sites of fibers, and do not start from the mechanism that causes fiber keratinization. Starting from the mechanism of keratinization, we can repair keratinization more thoroughly. Here we propose a new repair process.