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A kind of method that uses glutinous rice to prepare medium molecular branched chain active agent

An active agent and molecular technology, applied in chemical instruments and methods, transportation and packaging, dissolution, etc., can solve the problems of large amount of water reducing agent, high cost of use, large molecular weight, etc., and achieve easy availability of raw materials and strong adaptability , good dispersion effect

Active Publication Date: 2019-06-28
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing starch superplasticizers need to go through two steps of oxidation and etherification, and the amount of superplasticizer is large, and the cost of use is relatively high
[0004] Glutinous rice flour is mainly composed of amylopectin, which has a large molecular weight and high viscosity. Recently, it has been invented to use glutinous rice flour to oxidize and reduce viscosity as a sizing agent and adhesive agent, but there has never been any report of making it into a water reducing agent.

Method used

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  • A kind of method that uses glutinous rice to prepare medium molecular branched chain active agent

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Add water and glutinous rice flour to the reaction kettle to make a 10% glutinous rice slurry, adjust the pH to 1 with dilute sulfuric acid, stir and raise the temperature to 85°C, keep the temperature for 40 minutes, and cool to 60°C. Add glutinous rice flour 2% ferrous sulfate catalyst and 40% glutinous rice flour hydrogen peroxide solution (mass fraction 30%) into the gelatinization solution and continue to react for 1.5 hours. When the product carboxyl content reaches 8.51%, oxidize starch Add 5% iron powder by mass of glutinous rice flour to the slurry to remove the remaining oxidant. Use calcium carbonate mineral powder to neutralize the excess acid to pH=3~4, filter out the precipitation and impurities, and then obtain the branched molecular active agent product.

Embodiment 2

[0025] Add water and glutinous rice flour to the reaction kettle to make a 10% glutinous rice slurry, adjust the pH to 1 with dilute sulfuric acid, stir and raise the temperature to 85°C, keep the temperature for 40 minutes, and cool to 60°C. Add glutinous rice flour mass 2% ferrous sulfate catalyst and glutinous rice flour 40% hydrogen peroxide solution (mass fraction 30%) to the gelatinization solution and continue to react for 2 hours. When the product carboxyl content reaches 10.69%, oxidize starch Add 5% iron powder by mass of glutinous rice flour to the slurry to remove the remaining oxidant. Use calcium carbonate mineral powder to neutralize the excess acid to pH=3~4, filter out the precipitation and impurities, and then obtain the branched molecular active agent product.

Embodiment 3

[0027] Add water and glutinous rice flour to the reaction kettle to make a 10% glutinous rice slurry, adjust the pH to 1 with dilute sulfuric acid, stir and raise the temperature to 85°C, keep the temperature for 40 minutes, and cool to 60°C. Add glutinous rice flour 2% ferrous sulfate catalyst and glutinous rice flour 40% hydrogen peroxide solution (mass fraction 30%) to the gelatinization solution and continue to react for 2.5 hours. When the product carboxyl content reaches 12.17%, oxidize starch Add 5% iron powder by mass of glutinous rice flour to the slurry to remove the remaining oxidant. Use calcium carbonate mineral powder to neutralize the excess acid to pH=3~4, filter out the precipitation and impurities, and then obtain the branched molecular active agent product.

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Abstract

The invention discloses a method for preparing a medium molecular branched chain active agent from glutinous rice. The method uses glutinous rice flour as the main raw material, and after gelatinization, catalytic oxidation, removal of residual oxidant, neutralization and impurity removal, etc., the viscosity-average molecular weight is obtained. 8000-4000 branched chain medium molecular active agent slurry, the active agent slurry can be used directly as a product, and can be used as a product after spray drying or ethanol precipitation drying. The beneficial effects of the method are: the active agent product is non-toxic, has high surface activity, and can be used for food, It is used as an auxiliary agent in other industrial fields such as medicines and daily necessities. Its manufacturing process is simple and environmentally friendly, and the source of raw materials is sufficient and easy to obtain. The mass of the active agent added in concrete manufacturing is only 0.1% to 0.3% of the mass of the traditional cementitious material, and the water reduction rate can reach 20% to 40%.

Description

Technical field [0001] The invention relates to a method for preparing a medium molecular branched chain oxidant from deep-oxidized glutinous rice flour, which belongs to the field of surfactants, in particular to a method for preparing a medium molecular branched chain active agent from glutinous rice. Background technique [0002] Water reducing agent is one of the commonly used admixtures in construction engineering. In order to improve the workability of fresh concrete and increase the strength and durability of concrete, a water reducing agent is usually added when mixing concrete. At present, the water-reducing agents commonly used in engineering include ordinary water-reducing agents and high-efficiency water-reducing agents. The price of ordinary water-reducing agents is cheap, but the water-reducing rate is low. The high-efficiency water-reducing agent naphthalene-based water-reducing agent has a high water-reducing rate, but it is not environmentally friendly and has p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/18B01F17/32C04B24/38C04B103/30C09K23/32
CPCC04B24/38C08B31/18C04B2103/302C09K23/00
Inventor 何亮马育苗成成
Owner CHONGQING JIAOTONG UNIVERSITY