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Corn starch surface sizing agent and preparation method thereof

A technology of surface sizing agent and corn starch, which is applied in the direction of water repellent addition, coating, paper coating, etc., can solve the problems of high pollution of catalysts, waste of resources, difficulty in recycling, etc., and achieve easy promotion, low cost, and water resistance Good effect of sex and water resistance

Pending Publication Date: 2019-01-25
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional preparation process of oxidized starch, the use of a large number of oxidants and catalysts will cause environmental pollution and waste of resources. Nanocellulose as a catalyst can play a better oxidation-promoting effect, and can avoid the high pollution and difficulty of recycling of traditional catalysts. Shortcomings

Method used

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  • Corn starch surface sizing agent and preparation method thereof
  • Corn starch surface sizing agent and preparation method thereof
  • Corn starch surface sizing agent and preparation method thereof

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preparation example Construction

[0024] As introduced in the background technology, there is a need for a surface sizing agent with simple ingredients, environmental protection, low cost, degradability and excellent performance. For this, in the first typical embodiment of the present disclosure, a corn The preparation method of starch surface sizing agent, the method may further comprise the steps:

[0025] Using cornstarch as raw material, sodium hypochlorite (NaClO) as an oxidant, and nanocrystalline cellulose as an auxiliary oxidant to prepare oxidized cornstarch; wherein, the amount of available chlorine of the NaClO relative to the dry cornstarch is 8.0-9.0wt%, and the nanocrystalline cellulose The consumption of cellulose is 0.5~0.8wt% of dry cornstarch;

[0026] The prepared oxidized corn starch is compounded with polyvinyl alcohol and glycerin to prepare a corn starch surface sizing agent.

[0027] The starches of different plants are quite different, including the shape and size of starch granules ...

Embodiment 1

[0052] A preparation method of nanocellulose / oxidized cornstarch surface sizing agent, comprising the following steps:

[0053] 1) Preparation of oxidized cornstarch:

[0054] At room temperature, dissolve cornstarch in water (the mass ratio of starch to water is 1:2), add 0.5wt% (relative to the mass of dry cornstarch) nanocrystalline cellulose into the starch solution, and heat in a water bath at 50°C And keep stirring for 0.5h to make it mix evenly, adjust the pH of the reaction system with 0.1mol / L NaOH to be 9, and add the sodium hypochlorite with an amount of available chlorine of 8.0wt% to react for 4h, adjust the pH of the reaction system to neutrality, terminate the reaction and use Wash and centrifuge repeatedly with absolute ethanol and deionized water, dry and grind to obtain oxidized corn starch, and the molecular weight of the obtained oxidized corn starch is determined to be 1.3×10 6 -5.5×10 6 , The carboxyl content is about 1.1%.

[0055] 2) Preparation and ...

Embodiment 2

[0058] A preparation method of nanocellulose / oxidized cornstarch surface sizing agent, comprising the following steps:

[0059] 1) Preparation of oxidized cornstarch:

[0060] At room temperature, dissolve cornstarch in water (the mass ratio of starch to water is 1:2), add 0.5wt% (relative to the mass of dry cornstarch) nanocrystalline cellulose into the starch solution, and heat in a water bath at 50°C And keep stirring for 0.5h to make it mix evenly, adjust the pH of the reaction system with 0.1mol / L NaOH to be 9, and add the sodium hypochlorite with an amount of available chlorine of 8.0wt% to react for 4h, adjust the pH of the reaction system to neutrality, terminate the reaction and use Wash and centrifuge repeatedly with absolute ethanol and deionized water, dry and grind to obtain oxidized corn starch, and the molecular weight of the obtained oxidized corn starch is determined to be 1.3×10 6 -5.5×10 6 , The carboxyl content is about 1.1%.

[0061] 2) Preparation and ...

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Abstract

The invention relates to a preparation method of a corn starch surface sizing agent. The method includes the steps of adopting corn starch as a raw material, adopting sodium hypochlorite (NaClO) as anoxidant, and adopting nanometer microcrystalline cellulose as an auxiliary oxidant for preparing oxidized corn starch, wherein the available chlorine dosage of NaClO relative to absolutely dried cornstarch is 8.0-9.0 wt%, and the dosage of the nanometer microcrystalline cellulose relative to the absolutely dried corn starch is 0.5-0.8 wt%; combining the prepared oxidized corn starch with polyvinyl alcohol and glycerol to prepare the corn starch surface sizing agent. Sodium hypochlorite oxidized starch prepared by catalysis of nanometer cellulose in specific length can be used for preparing asurface sizing agent which is low in viscosity, high in glue stability, high in transparency and great in film-forming property.

Description

technical field [0001] The disclosure belongs to the field of starch sizing agent preparation, in particular to a preparation method of oxidized corn starch surface sizing agent. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] In industrial production, surface sizing agents are widely used, but the addition of traditional chemicals increases the ionic complexity of surface sizing agents and affects the use of sizing agents. At present, the main requirements for surface sizing agents are low viscosity, high bonding strength, strong glue stability and good film-forming properties. [0004] Starch is a kind of cheap natural high-molecular carbohydrates, and natural starch has high viscosity, poor fluidity, poor cohesiveness and film-forming property; after oxidative modification, the gelatinization temperature and viscosity of starch are reduced, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H19/14D21H19/20C08B31/18
CPCC08B31/18D21H19/14D21H19/20D21H21/16
Inventor 林兆云杨桂花陈嘉川和铭夏媛媛
Owner QILU UNIV OF TECH
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