Method for reducing aldehyde content of melamine impregnating solution in papermaking industry under premise of guaranteeing quality and output

Abstract

The invention discloses a method for reducing the aldehyde content of melamine impregnating solution in the papermaking industry under the premise of guaranteeing quality and output. The method adoptsparts by weight to prepare 200 to 220 parts of pine wood material, 15 to 20 parts of porcelain clay, 8 to 10 parts of silicon dioxide powder, 40 to 43 parts of epoxy chloropropane, 14 to 15 parts ofadipic acid, 12.5 to 13 parts of melamine, 25 to 30 parts of peach juvenile branchlet, 2 to 3 parts of aqueous cellulase solution, 2 to 3 parts of silicate bacterium agent, 5 to 8 parts of white-rot fungus agent, enough acetic acid and enough hydrogen peroxide as materials, and the process comprises six steps: preparation of raw materials, preparation of wood fibers, rupture of cell walls, preparation of binder, preliminary shaping and dry sterilization and paper shaping. The invention has the advantages of no formaldehyde, easy manufacturing process implementation, continuous manufacturing, intact fibers, environment-friendliness, no public hazard, high fiber yield, suitability for industrial mass production and stable quality.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a method for reducing the aldehyde content of melamine impregnated liquid in the papermaking industry while maintaining quality and output. Background technique [0002] For a long time, the destruction and pollution of the environment by the paper industry has been recognized, and it is an industry that consumes a lot of energy. The cooking, bleaching, washing and other operations in the conventional production process of paper will discharge a large amount of waste gas and waste water, which will seriously pollute and deteriorate the ecological environment. Among them, the toxic and harmful melamine-modified urea-aldehyde resin based on formaldehyde is currently the most commonly used Wet strength agent, causing a lot of pollution and totally hidden dangers. In order to solve this long-standing problem, the technology of composite materials composed of polymer materials su...

AI Technical Summary

Problems solved by technology

Therefore, the common problem is that since the synthetic paper made of these materials has no capillary pores and non-absorbent material, its printability is much worse than that of wood pulp paper, and its plasticity is extremely low for printing.

Moreover, due to the use of a relatively high content of resin, it is difficult to recycle paper after use, which will cause corresponding pollution to the environment and lack a real sense of environmental protection.

However, if the content of inorganic mineral powder is increased, the compatibility and dispersion of inorganic mineral powder and matrix resin are poor, which will easily cause surface de-powdering, affect printability, and also affect product stability, tear resistance and durability. Tortuousness, high filling volume, high requirements on equipment and process, huge investment, often hundreds of millions of yuan, product cost is several times higher than ordinary paper, overall cost is higher than traditional wood pulp paper, unable to enhance competitiveness

Therefore, the current environmental protection method of papermaking is difficult to compete with traditional paper in terms of quality, cost, and environmental protection, which hinders its production and application promotion.

[0003] However, the environmental protection papermaking technology in the prior art is limited by the lack of technical field and practical experience. At present, there is still no formaldehyde-free paper in the market. A papermaking method with high efficiency, suitable for industrialized mass production, and stable quality