Modified starch

A technology of modified starch and wet starch, applied in the field of modified starch, can solve the problem of high volatile concentration of organic matter used, and achieve the effects of reducing the use of chemical reagents, stable viscosity and good shear resistance.

Inactive Publication Date: 2012-10-17
厦门能藏义实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the production process of the existing polyurethane foam plastics, 10% calcium carbonate and 90% isocyanate and polyether polyol need to be added by weight percentage, which results in the usage of isocyanate and polyether polyol and the amount of foaming The situation where the volatile concentration of organic compounds in the production process is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Get 1000g cornstarch and 1300g pulping water, the pulping water hardness (Mg 2+ , Ca 2+ Concentration) below 30. Add 1000g of cornstarch and 1300g of slurry mixing water in a stirring tank, form the slurry of Baume degree 18Be after stirring evenly, add the sodium hydroxide that weight volume ratio concentration is 10% and adjust slurry pH value to 10.8, then Add 10g of sodium trimetaphosphate, carry out cross-linking and esterification reaction at 39.5°C, neutralize the starch slurry to pH 6.0 with hydrochloric acid after the reaction, and then use a disk separator to separate the pH regulator, sodium phosphate and untreated sodium phosphate The sodium trimetaphosphate of reaction is separated, and the conductivity of the starch slurry is controlled at 70us / cm with an online conductivity detector, and then the starch slurry is initially dehydrated with a centrifuge to obtain a water content (percentage by weight) of 37 to 40%. Wet starch lumps, wet starch lumps are d...

Embodiment 2

[0033] Get 1000g cornstarch and 1400g pulping water, the pulping water hardness (Mg 2+ , Ca 2+ Concentration) below 30. Add 1000g of cornstarch and 1400g of slurry mixing water in a stirring tank, form the slurry of Baume degree 22Be after stirring, add the sodium hydroxide that weight volume ratio concentration is 15% and adjust slurry pH value to 11.2, then Add 40g of sodium trimetaphosphate for cross-linking and esterification reaction at 40.5°C. After the reaction, neutralize the starch slurry to about pH 6.5 with hydrochloric acid, and then use a disc separator to separate the pH regulator, sodium phosphate and sodium phosphate produced by the reaction. The unreacted sodium trimetaphosphate is separated, and the conductivity of the starch slurry is controlled at 150us / cm with an online conductivity detector, and then the starch slurry is initially dehydrated with a centrifuge to obtain a water content (percentage by weight) of 37 to 40%. The wet starch lumps are dried i...

Embodiment 3

[0040] Get 1000g cornstarch and 1350g pulping water, pulping water hardness (Mg 2+ , Ca 2+ Concentration) below 20. Add 1000g of cornstarch and 1350g of slurry mixing water in a stirring tank, form the slurry of Baume degree 20Be after stirring evenly, add the sodium hydroxide that weight volume ratio concentration is 5% and adjust slurry pH value to 11.0, then Add 30g of sodium trimetaphosphate, cross-linking esterification reaction at 40°C, neutralize the starch slurry to about pH 6.2 with hydrochloric acid after the reaction, and then use the disc separator to separate the pH regulator, sodium phosphate and sodium phosphate produced by the reaction. The unreacted sodium trimetaphosphate is separated, and the conductivity of the starch slurry is controlled at 100us / cm with an online conductivity detector, and then the starch slurry is initially dehydrated with a centrifuge to obtain a water content (percentage by weight) of 37 to 40%. The wet starch lumps are dried in a hi...

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Abstract

The invention provides a modified starch, which comprises the following components by weight: 100 parts of corn starch, 1-4 parts of sodium trimetaphosphate, 0.6-1 part of NaOH, 0.8-1.5 parts of HCl and 130-140 parts of mixing water. The modified starch possesses the advantages of good flowability, certain lipophilicity, high gelatinization temperature, stable viscosity and good anti-shearing ability, and can replace partial polyether glycol and partial isocyanate in the production of polyurethane foamed plastics.

Description

technical field [0001] The invention relates to a modified starch. Background technique [0002] In order to improve the performance of starch and expand its application range, physical, chemical or enzymatic treatment is used to introduce new functional groups on starch molecules or change the size of starch molecules and the properties of starch granules, thereby changing the natural characteristics of starch (such as: gelatinization temperature , thermal viscosity and its stability, freeze-thaw stability, gel strength, film-forming properties, transparency, etc.), making it more suitable for certain application requirements. This kind of starch that has been processed more than two times and changed its properties is collectively called modified starch. [0003] The purpose of denaturation: one is to adapt to the requirements of various industrial applications. The second is to open up new uses of starch and expand the scope of application. [0004] Starch phosphate ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/06C08G18/64C08G18/48C08J9/08C08G101/00
Inventor 黄荣灿朱小明
Owner 厦门能藏义实业有限公司
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