Preparation method of oxidation cross-linked esterification triple modified starch

A technology for oxidizing cross-linked ester and cross-linked ester, applied in the field of modified starch, can solve the problems of high price of acetic anhydride, reduce reaction efficiency, increase cost, etc., achieve good freeze-thaw stability, improve reaction efficiency, and fast reaction speed Effect

Inactive Publication Date: 2007-10-03
NANTONG JINNIU MACHINERY MFR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acetic anhydride in this crosslinking agent is excessive, and the excessive acetic anhydride has a great influence on the whole system, which reduces the reaction efficiency. In addition, the price of acetic anhydride is also expensive, which increases the cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Stir 700kg of starch and 1000kg of water evenly, add 5kg of 3wt% copper sulfate solution, adjust to pH 7 with 5wt% NaOH solution; slowly add 5.5kg 27.5wt% hydrogen peroxide solution dropwise , React for 1.5 hours at 40℃ to make the reaction fully proceed, then add 30kg of 5wt% sodium thiosulfate solution to destroy the remaining oxygen; under the condition of pH 10, add 0.15kg of esterification crosslinking The esterification crosslinking agent of this embodiment is a mixture of acetic anhydride and adipic acid in a weight ratio of 1:2. The conversion rate can reach 90% after reacting for 1 hour at 40°C; after the reaction, The reaction product is subjected to centrifugal dehydration and drying to obtain the oxidized crosslinked esterified triple modified starch of the present invention. The viscosity (6%, 95°C) of the oxidative crosslinked esterified triple modified starch produced in this example is 10-11 mPa·s.

Embodiment 2～ Embodiment 4

[0015] The preparation method is the same as in Example 1, and the dosage of each component and other data are shown in Table 1.

Embodiment 5～ Embodiment 8

[0017] The preparation method is the same as in Example 1, and the dosage of each component and other data are shown in Table 2.

[0018] Example 1

[0019] Example 1

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PUM

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Abstract

This invention relates to a preparation method of oxidation, cross linkage, esterification ternary modified starch. It has following steps:(1) by weight ratio 1 : 1- 1 : 2 to blend and whip uniformity of mixture starch and water, add catalyzer, use alkaline solution to adjust pH for 6 to 9; (2) drop oxidizer, take oxidation reaction 1 to 2 hours at 35 to 45 deg, add termination agent to destroy surplus oxygen; (3) Drop esterification cross-linking agent to product after oxidation reaction, takes esterification and cross linking reaction 1 to 2 hours at 35 to 45 deg. The described esterification cross-linking agent is mixed solvent of acetic anhydride and dicarboxylic acid, proportion by weight is 1 : 1 to 1: 60; (4) centrifugal dewatering the product after esterification cross linking reaction, and then drying to obtain product.

Description

Technical field [0001] The invention belongs to the technical field of modified starch, and specifically relates to a preparation method of oxidative cross-linking esterified triple modified starch. Background technique [0002] Starch is a kind of natural macromolecule polymer. The starch slurry has a wide range of sources, is low in price, and has good adhesion to hydrophilic natural fibers. Due to structural reasons, the viscosity of starch slurry fluctuates greatly, the film is brittle and hard, and its performance is not very satisfactory. Therefore, it is necessary to modify the starch to obtain a variety of modified starches that meet market requirements. [0003] At present, industrial production basically adopts the water-based production process with sodium hypochlorite as the oxidant. This process requires a large amount of oxidant, which requires 200kg of oxidant per 1 ton of product, and produces a lot of waste water, which has a great impact on the environment. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/18C08B31/02C08K5/092C08K3/00
Inventor 王琪陈秀珍周全法
Owner NANTONG JINNIU MACHINERY MFR
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