Preparation method for oxidation cross-linked-carboxymethyl composite modified starch, and oxidation cross-linked-carboxymethyl composite modified starch

A technology of compound modified starch and oxidative cross-linking, which can be used in coatings, paper coatings, textiles and papermaking, etc., can solve the problems of difficult carboxymethyl starch, flammable organic solvents, and high cost, so as to reduce production costs and prevent The effect of starch agglomeration and fast heating

Active Publication Date: 2012-09-26
GUANGDONG HUIMEI STARCH SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong water solubility of carboxymethyl starch products, the substitution degree of 0.1 or above can be dissolved in cold water to obtain a clear and transparent viscous solution, which requires the use of organic solvents (such as ethanol, methan

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1 Oxidative crosslinking-carboxymethyl compound modified starch

[0040] The oxidative crosslinking-carboxymethyl compound modified starch of the present embodiment, its preparation method comprises the steps:

[0041] Step 1 Oxidative cross-linking Put cornstarch and water into the dissolving tank, stir to prepare a starch slurry with a concentration of 20 degrees Baume, adjust the pH value of the starch slurry to 10-11.5 with sodium hydroxide with a concentration of 4% by mass Then start to heat up, control the temperature of starch slurry at 35-42°C, add sodium hypochlorite and phosphorus oxychloride while stirring, carry out cross-linking reaction for 90-150 minutes under stirring, and take samples for detection when the mass ratio concentration of starch slurry is 25%. When the viscosity of the starch reaches 3-10mpa.s, the cross-linking reaction will end. Slowly add sodium bisulfite to the reaction system until the chlorine test paper changes color, stop ...

Embodiment 2

[0051] Example 2 Oxidative crosslinking-carboxymethyl compound modified starch

[0052] The oxidative crosslinking-carboxymethyl compound modified starch of the present embodiment, its preparation method comprises the steps:

[0053] Step 1 Oxidative crosslinking

[0054] Put potato starch and water into the dissolving tank, stir to prepare a starch slurry with a concentration of 24 degrees Baume, adjust the pH value of the starch slurry to 10-11.5 with sodium hydroxide with a mass percentage concentration of 5%, and then start to heat up. The temperature of the starch slurry is controlled at 35-42°C, and sodium hypochlorite and epichlorohydrin are added while stirring, and the cross-linking reaction is carried out for 90-150 minutes while stirring, and the viscosity of the starch reaches 25% when the mass ratio concentration of the starch slurry is 25%. 3 ~ 10mpa.s to end the cross-linking reaction, slowly add sodium bisulfite to the reaction system until the color of the ...

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Abstract

The invention discloses a preparation method for oxidation cross-linked-carboxymethyl composite modified starch and the oxidation cross-linked-carboxymethyl composite modified starch. According to the preparation method, starch raw materials are subjected to oxidation cross-linking to form cross-linked starch, and the cross-linked starch which is used as a reaction raw material is subjected to carboxymethylation in a microwave reaction system and an infrared heat preservation system to form the required oxidation cross-linked-carboxymethyl composite modified starch. The preparation method is simple, low in cost and high in comprehensive cost performance; an organic solvent is not needed to be adopted; and the prepared oxidation cross-linked-carboxymethyl composite modified starch is high in performance, and coating slurry with high concentration of more than 30 percent can be prepared by using the modified starch, is high in flowability and water-retaining property, can meet the coating requirements of high-end products such as carbonless copy paper, coated paper and the like in papermaking industry well, and the oxidation cross-linked-carboxymethyl composite modified starch has good development and application prospect.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to the modified starch technology for coating in the papermaking industry, and in particular to a preparation method of oxidative crosslinking-carboxymethyl composite modified starch and oxidative crosslinking-carboxymethyl composite modified starch. Background technique [0002] Starch is widely distributed in nature and is an inexhaustible renewable natural resource. With the development of production and technology, people gradually realize the seriousness of energy and environmental issues, so people pay more and more attention to the in-depth development and application of renewable resources. As a renewable resource with abundant sources, starch has been widely concerned and applied due to its excellent performance. [0003] Native starch is insoluble in cold water, starch gelatinization is easy to age, poor film performance, lack of emulsifying power, poor drug resistanc...

Claims

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Application Information

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IPC IPC(8): C08B31/12C08B31/00C08J3/28C08J3/24D21H19/54
Inventor 喻永青
Owner GUANGDONG HUIMEI STARCH SCI & TECH
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