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Technology for preparing paper sizing agent from soy protein by using high-pressure gelatinization method

A technology of paper sizing agent and soybean protein, applied in papermaking, paper coating, adding water repellent, etc., can solve the problems of high cost, complex production process, environmental pollution, etc. The effect of mechanical properties and stable mechanical properties

Inactive Publication Date: 2018-08-28
金继善
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, commercially available surface sizing agents include styrene-maleic anhydride polymer, styrene-acrylic acid polymer aqueous solution, styrene-acrylate polymer emulsion, water-soluble polyurethane, etc., but these sizing agents need Organic solvents or surfactants will pollute the environment during application, and the production process is complicated and costly

Method used

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  • Technology for preparing paper sizing agent from soy protein by using high-pressure gelatinization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) High-pressure gelatinization: first add 50g of soybean protein powder into the autoclave, and add water to make the water content reach 75-80wt%, extract the air in the autoclave to -0.08MPa, and then feed nitrogen to raise the pressure in the autoclave to 0.01MPa , repeatedly pumping out air and feeding nitrogen 5 times to completely replace the air in the kettle; then feeding nitrogen to raise the pressure inside the kettle to 1.5-1.8MPa, heating at the same time to make the temperature inside the kettle reach 40-45°C and keep it warm at this temperature Stir for 5 minutes; continue to feed nitrogen to raise the pressure in the kettle to 2.2-2.5MPa, heat at the same time to make the temperature in the kettle reach 50-55°C and keep stirring at this temperature for 5 minutes; feed nitrogen again to raise the pressure in the kettle to 2.7-3.0 MPa, at the same time, continue to heat and stir at the temperature of 50-55°C in the kettle for 5 minutes, stop feeding nitrog...

Embodiment 2

[0030] (1) High-pressure gelatinization: first add 50g of soybean protein powder into the autoclave, and add water to make the water content reach 75-80wt%, extract the air in the autoclave to -0.08MPa, and then feed nitrogen to raise the pressure in the autoclave to 0.01MPa , repeatedly pumping out air and feeding nitrogen 5 times to completely replace the air in the kettle; then feeding nitrogen to raise the pressure inside the kettle to 1.5-1.8MPa, heating at the same time to make the temperature inside the kettle reach 40-45°C and keep it warm at this temperature Stir for 5 minutes; continue to feed nitrogen to raise the pressure in the kettle to 2.2-2.5MPa, heat at the same time to make the temperature in the kettle reach 50-55°C and keep stirring at this temperature for 5 minutes; feed nitrogen again to raise the pressure in the kettle to 2.7-3.0 MPa, at the same time, continue to heat and stir at the temperature of 50-55°C in the kettle for 5 minutes, stop feeding nitrog...

Embodiment 3

[0035] (1) High-pressure gelatinization: first add 50g of soybean protein powder into the autoclave, and add water to make the water content reach 75-80wt%, extract the air in the autoclave to -0.08MPa, and then feed nitrogen to raise the pressure in the autoclave to 0.01MPa , repeatedly pumping out air and feeding nitrogen 5 times to completely replace the air in the kettle; then feeding nitrogen to raise the pressure inside the kettle to 1.5-1.8MPa, heating at the same time to make the temperature inside the kettle reach 40-45°C and keep it warm at this temperature Stir for 5 minutes; continue to feed nitrogen to raise the pressure in the kettle to 2.2-2.5MPa, heat at the same time to make the temperature in the kettle reach 50-55°C and keep stirring at this temperature for 5 minutes; feed nitrogen again to raise the pressure in the kettle to 2.7-3.0 MPa, at the same time, continue to heat and stir at the temperature of 50-55°C in the kettle for 5 minutes, stop feeding nitrog...

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Abstract

The invention discloses a technology for preparing a paper sizing agent from soy protein by using a high-pressure gelatinization method, and relates to the technical field of paper sizing agent processing. The technology comprises the following steps of 1, high-pressure gelatinization, 2, micronization, 3, adjuvant preparation and 4, sizing agent preparation. According to the technology, high-pressure gelatinization of the soy protein is completed through three-time pressure rise operation and two-time temperature rise operation so that the treated soy protein can be quickly formed into homogeneous paste even under the condition that cold water is used as a solvent; the paste is insensitive in temperature, and accordingly, the sizing agent which is finally prepared is stable in mechanicalproperty both in a low-temperature service environment and a high-temperature service environment. Through high-pressure gelatinization, the problem is avoided that after being subjected to high-temperature gelatinization at atmospheric pressure, the soy protein is irreversibly transformed, and consequently, solubility is lost.

Description

Technical field: [0001] The invention relates to the technical field of paper sizing agent processing, in particular to a process for preparing paper sizing agent from soybean protein by using a high-pressure gelatinization method. Background technique: [0002] my country's papermaking fiber raw material structure is different from other countries. The pulp fibers used in the papermaking process are shorter, more miscellaneous cells, and more types of auxiliary chemicals are used. Therefore, the effect of using sizing agent in the slurry is not good, and the dosage is large, which requires high stability of the sizing agent, and because the sizing agent in the slurry is difficult to separate, the pollution caused is also difficult to control. [0003] In recent years, especially in the production of container board and corrugated base paper, surface sizing agents have been used instead of internal sizing. The use of surface sizing can directly improve the ring compressive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H19/14D21H19/20D21H19/30C08H1/00
CPCD21H21/16C08H1/00D21H19/14D21H19/20D21H19/30
Inventor 金继善
Owner 金继善