Environmentally friendly surface sizing agent capable of improving paper smoothness and barrier property and a preparation method and application of environmentally friendly surface sizing agent

A surface sizing agent, an environment-friendly technology, applied in the pulp beating method, paper, papermaking, etc., can solve the problems of poor film formation, difficulty in direct application, high viscosity, etc., and achieve the effect of improving surface properties

Inactive Publication Date: 2018-10-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the natural unmodified starch is not easy to be directly applied due to its shortcomings such as high viscosity, poor fluidity, poor film-forming performance, and unsatisfactory sizing effect, and the starch is generally modified.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Preparation of micro-nano cellulose: Refining bleached wood pulp to disperse the fibers, the concentration of the pulp after treatment is 8wt%; Enzymolysis treatment is carried out on the pulp after refining, and the cellulose is compounded first Enzyme (enzyme activity: 180 PFU / g) was dissolved in deionized water to obtain an enzymolysis solution; then the enzymolysis solution was used to adjust the slurry concentration to 5 wt%, and the enzyme dosage was 50g / kg (relative to the dry pulp). The pH is 5.5, the temperature is 60.0 ℃ and the enzymolysis is 12.0 h; the slurry after enzymolysis is subjected to nano-mechanical grinding treatment, the pressure is 20.0 MPa, and the number of grinding is 40.0 times; after that, high-pressure homogenization treatment is carried out to homogenize the internal The fluid pressure is 135.0Mpa, and the homogenization is performed 20.0 times to obtain micro-nano cellulose.

[0040] (2) Preparation of surface sizing agent: Put the g...

Embodiment 2

[0043] (1) Preparation of micro-nano cellulose: Refining bleached wood pulp to disperse the fibers, the concentration of the pulp after treatment is 8 wt %; Enzymolysis treatment is carried out on the pulp after refining, and the cellulose The compound enzyme (enzyme activity: 180 PFU / g) was dissolved in deionized water to obtain the enzymolysis solution; then the enzymolysis solution was used to adjust the slurry concentration to 5 wt%, and the enzyme dosage was 50g / kg (relative to the dry pulp), Enzymolysis was carried out at pH 5.5 and temperature 60.0 ℃ for 12.0 h; the slurry after enzymolysis was subjected to nano-mechanical grinding treatment, the pressure was 20.0 MPa, and the number of grinding times was 40.0 times; The internal fluid pressure is 135.0 Mpa, and the micro-nano cellulose is obtained by homogenizing 20.0 times.

[0044](2) Preparation of surface sizing agent: Put the gelatinized cationic starch milk with a concentration of 5.0 wt% in a beaker and disperse...

Embodiment 3

[0047] (1) Preparation of micro-nano cellulose: Refining bleached wood pulp to disperse the fibers, the concentration of the pulp after treatment is 8 wt %; Enzymolysis treatment is carried out on the pulp after refining, and the cellulose The compound enzyme (enzyme activity: 180 PFU / g) was dissolved in deionized water to obtain the enzymolysis solution; then the enzymolysis solution was used to adjust the slurry concentration to 5 wt%, and the enzyme dosage was 50g / kg (relative to the dry pulp), Enzymolysis was carried out at pH 5.5 and temperature 60.0 ℃ for 12.0 h; the slurry after enzymolysis was subjected to nano-mechanical grinding treatment, the pressure was 20.0 MPa, and the number of grinding times was 40.0 times; The internal fluid pressure is 135.0 Mpa, and the micro-nano cellulose is obtained by homogenizing 20.0 times.

[0048] (2) Preparation of surface sizing agent: Put the gelatinized cationic starch milk with a concentration of 5.0 wt% in a beaker and dispers...

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PUM

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Abstract

The invention discloses an environmentally friendly surface sizing agent capable of improving paper smoothness and barrier property and a preparation method and application of the environmentally friendly surface sizing agent. The method comprises the following steps: (1) preparation of micro-nano celluloses: pretreating bleaching wood pulp by a mechanical method, and carrying out enzymolysis treatment, nano grinding and homogenization treatment on the pretreated material to obtain the micro-nano celluloses; and (2) preparation of the surface sizing agent: pasting cationic starch under heatingand stirring conditions at first, cooling to a certain temperature, then adding the micro-nano celluloses, and continuously stirring at the temperature until the material is uniform to obtain the environmentally friendly surface sizing agent. An application process comprises the following steps: sizing paper by using a roll coater, naturally air-drying the sized paper, carrying out press polish treatment on the dried paper, and detecting influences of the sizing agent to the surface performance of the paper. By the disclosed environmentally friendly surface sizing agent with micro-nano cellulose / starch, the smoothness and barrier property of paper can be improved effectively.

Description

technical field [0001] The invention belongs to the field of papermaking additives, and in particular relates to an environment-friendly surface sizing agent for improving paper smoothness and barrier performance and a preparation method thereof. Background technique [0002] Surface sizing usually refers to applying a sizing solution to the paper surface with a sizing machine or directly dipping into the sizing agent solution to form a layer of granules after the sizing agent is dried to make the paper or cardboard have a Certain surface strength. After the surface sizing of paper or cardboard, it not only enhances the surface strength of the paper, but also improves the printing performance of the paper, enhances the wear resistance and durability of the paper, and can reduce the problem of lint and powder loss of the paper during the printing process. Traditional internal pulp sizing has a large loss of sizing agent during the papermaking process, which easily causes pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21D1/02D21H21/16D21H23/56
CPCD21C5/005D21D1/02D21H21/16D21H23/56
Inventor 高文花付浩成王胜丹陈克复曾劲松王斌徐峻
Owner SOUTH CHINA UNIV OF TECH
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