3results about How to "Improve bleaching effect" patented technology

The invention belongs to the technical field of organic compounds and artificial boards, and relates to a whitening agent, a preparation method thereof and application of the whitening agent in whitening type medium density fiberboards, the whitening agent comprises the following components by mass percent: 2-5% of hydrogen peroxide, 0.2-0.6% of sodium silicate, 0.5-1.5% of sodium hydroxide, 0.1-0.4% of water-soluble stilbene fluorescent whitening agent and the balance of water. The preparation method comprises the following steps: sequentially adding the components into water at 60-65 DEG C, stirring and dissolving, and keeping the temperature at 60 DEG C for later use. When being applied, the cleaning agent is added in a wood chip washing process, the mass of the cleaning agent is 1-1.5% of the total mass of cleaning water for the first time, and 0.05-0.08% of the cleaning agent is supplemented per hour subsequently. According to the whitening agent, through the synergistic effect of chemical oxidation and physical color complementing, the whiteness of a fiberboard reaches 31-36 (only 14 in a conventional process), the physical and chemical properties meet the GB / T 11718-2021 standard, and the whitening agent is environmentally friendly, free of residues, simple to prepare and apply, suitable for industrial continuous production and capable of remarkably improving the added value of products.

The utility model discloses a corrugating medium environment-friendly low chlorine residue bleaching device in the technical field of corrugating medium production, which comprises a bleaching pool, a dust filtering box and a cleaning box, the dust filtering box is fixedly connected to the right side wall of the bleaching pool, the cleaning box is fixedly connected to the top of the dust filtering box, and the dust filtering box is fixedly connected to the right side wall of the bleaching pool. A net plate is fixedly connected between the inner side walls of the cleaning box, ultrasonic transducers are fixedly connected to the front side wall and the rear side wall of an inner cavity of the cleaning box, an ultrasonic generator is fixedly connected to the front side wall of the cleaning box, and the ultrasonic generator is electrically connected with the ultrasonic transducers through wires. The environment-friendly low-chlorine-residue bleaching device for the corrugating base paper is reasonable in structural design, chlorine-containing residues of the corrugating base paper can be reduced, the use safety of the corrugating base paper can be guaranteed, chemical precipitation can be avoided, and the bleaching effect of the corrugating base paper can be improved.

An environmentally friendly wood bleaching treatment method using ultraviolet photocatalysis is disclosed, belonging to the field of wood bleaching. This invention aims to solve the problems of low efficiency, yellowing of bleached wood, excessive bleaching waste liquid, and severe reduction in mechanical properties associated with existing bleaching methods. The treatment method includes: 1. Coating with bleaching solution; 2. Catalytic bleaching. This invention is used for environmentally friendly wood bleaching treatment using ultraviolet photocatalysis.