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Method for improving strength of waste paper fiber by constructing nano-polyelectrolyte multilayer films

A waste paper fiber, polyelectrolyte technology, applied in the direction of non-fiber pulp addition, fiber raw material treatment, secondary cellulose fiber, etc., can solve the problem of restricting the increase of paper and cardboard products and the improvement of quality, and hindering the development of high-grade paper. , affecting the recycling and utilization of waste paper, etc., to achieve the effect of improving the water filtration performance of pulp, improving physical strength and strong adaptability

Inactive Publication Date: 2011-11-16
湛江市吉城纸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the increase in the number of secondary fiber recycling, the serious defect of recycled paper-keratinization of fibers affects the recycling of waste paper, limits the increase in the variety and quality of paper and cardboard products, and hinders high-grade paper types development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method based on electrostatic layer-by-layer self-assembly technology to construct a nano-polyelectrolyte multilayer film to improve the fiber strength of waste paper. First, the waste corrugated cardboard is shredded and beaten until the freeness of the pulp is 590mL, and the concentration is 0.8%. Paper fiber aqueous phase dispersion system, adjust the pH value of the system to 7.8, under the stirring condition of 200 rpm / min, add polydiene dimethyl ammonium chloride in an amount of 1.0% (to dry fiber), the polydiene dimethyl ammonium chloride used Dimethyl ammonium chloride has a molecular weight of 450,000, a 20% aqueous solution, a viscosity of 960cP (25°C), a refractive index of 1.37, and a density of 1.04g / L. The polymer was adsorbed on the waste paper fibers for 25 minutes to complete the first layer of self-assembly. Then, wash and filter the waste paper fibers after the above treatment, and then prepare a waste paper fiber aqueous phase dispersion system wit...

Embodiment 2

[0028]A method based on electrostatic layer-by-layer self-assembly technology to construct a nano-polyelectrolyte multilayer film to improve the fiber strength of waste paper. First, the waste corrugated cardboard is shredded and beaten until the freeness of the pulp is 590mL, and the concentration is 0.8%. Paper fiber aqueous phase dispersion system, adjust the pH value of the system to 7.8, under the stirring condition of 200 rpm / min, add polydiene dimethyl ammonium chloride in an amount of 1.0% (to dry fiber), the polydiene dimethyl ammonium chloride used Dimethyl ammonium chloride has a molecular weight of 450,000, a 20% aqueous solution, a viscosity of 960cP (25°C), a refractive index of 1.37, and a density of 1.04g / L. The polymer was adsorbed on the waste paper fibers for 25 minutes to complete the first layer of self-assembly. Then, wash and filter the waste paper fibers after the above treatment, and then prepare a waste paper fiber aqueous phase dispersion system with...

Embodiment 3

[0030] A method based on electrostatic layer-by-layer self-assembly technology to construct a nano-polyelectrolyte multilayer film to improve the fiber strength of waste paper. First, the waste corrugated cardboard is shredded and beaten until the freeness of the pulp is 590mL, and the concentration is 0.8%. Paper fiber aqueous phase dispersion system, adjust the pH value of the system to 7.8, under the stirring condition of 200 rpm / min, add polydiene dimethyl ammonium chloride in an amount of 1.0% (to dry fiber), the polydiene dimethyl ammonium chloride used Dimethyl ammonium chloride has a molecular weight of 450,000, a 20% aqueous solution, a viscosity of 960cP (25°C), a refractive index of 1.37, and a density of 1.04g / L. The polymer was adsorbed on the waste paper fibers for 25 minutes to complete the first layer of self-assembly. Then, wash and filter the waste paper fibers after the above treatment, and then prepare a waste paper fiber aqueous phase dispersion system wit...

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Abstract

The invention discloses a method for improve strength of waste paper fiber by constructing nano-polyelectrolyte multilayer films. In the method, a nanoscale polyelectrolyte multilayer film structure is formed on the surface of regenerated fiber by means of electrostatic layer-by-layer self-assembly of anionic and cationic polyelectrolyte on the surface of the waste paper fiber. The method has thebeneficial effects that by changing consumption of the polyelectrolyte, regulating and controlling the electrolyte multilayer film structure and adjusting the pH value of an electrostatic layer-by-layer self-assembly environmental system, the polyelectrolyte multilayer films with different properties can be obtained on the surface of the regenerated fiber so as to increase fiber bonding quantity;electrostatic attraction between anions and cations is taken as a film-forming driving force to prepare the ordered lamellar self-assembled multilayer ultra-thin films by means of alternate deposition of monomolecular layers in opposite ionic systems, and the preparation process has the advantages of simple conditions and strong adaptability and can realize surface modification of the waste paperfiber reused for a plurality of times; and strength of the finished paper prepared from the waste paper fiber after electrostatic layer-by-layer self-assembly modification is obviously enhanced, and drainage property of paper pulp is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking, and in particular relates to a method for constructing a nano polyelectrolyte multilayer film based on an electrostatic layer-by-layer self-assembly technology to improve the strength of waste paper fibers. Background technique [0002] In recent years, the increasing shortage of papermaking raw materials in the world, especially the environmental pollution and energy consumption problems faced by the pulping industry, has made people pay more and more attention to the utilization of secondary fiber, that is, waste paper. The rapid growth of waste paper utilization has become an important development trend of the world paper industry. As an important fiber source, secondary fiber can not only alleviate the contradiction between the shortage of papermaking raw materials and energy consumption, but also alleviate the increasingly serious environmental pollution problem and play an i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/18D21H17/45D21H17/25D21H11/14
Inventor 唐艳军史海真薛国新夏军张勇
Owner 湛江市吉城纸业有限公司
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