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Preparation process of modified cassava starch-polycarboxylic acid composite water reducing agent

A composite superplasticizer and cassava starch technology, which is applied in the field of building materials, can solve the problems of a large amount of toxic waste liquid discharge, toxic products, and difficulty in meeting green and environmental protection requirements.

Inactive Publication Date: 2020-07-07
NANNING TONGCAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation process of modified cassava starch-polycarboxylate composite water reducer, to solve the problems in the prior art that the product is toxic or the production process discharges a large amount of toxic waste liquid, it is not biodegradable, and it is difficult to meet the requirements of green and environmental protection. Environmental protection and other technical issues

Method used

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  • Preparation process of modified cassava starch-polycarboxylic acid composite water reducing agent

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Effect test

Embodiment 1

[0041] A kind of modified tapioca starch-polycarboxylate composite water reducing agent, its preparation process comprises the following steps:

[0042] S1: Oxidation reaction, add tapioca starch, sodium hydroxide, ethanol aqueous solution with a volume concentration of 95%, retarder, defoamer and air-entraining agent to the mixer at the same time, stir evenly at a speed of 700r / min, and heat to 20°C, keep for 60min, then cool down to room temperature naturally;

[0043] S2: acidification reaction, adding dilute hydrochloric acid solution with a mass concentration of 20% to the oxidation reaction solution, adjusting the pH to 7, filtering, beating the solid with absolute ethanol for 4 times, and drying to obtain oxidized-acidified starch;

[0044] S3: Etherification reaction, dissolving oxidized-acidified starch in absolute ethanol to form a suspension, adjusting the pH of the suspension to 10 with sodium hydroxide solution, feeding nitrogen, and then adding an etherification ...

Embodiment 2

[0052] A kind of modified tapioca starch-polycarboxylate composite water reducing agent, its preparation process comprises the following steps:

[0053] S1: Oxidation reaction, add tapioca starch, sodium hydroxide, ethanol aqueous solution with a volume concentration of 95%, retarder, defoamer and air-entraining agent to the mixer at the same time, stir evenly at a speed of 500r / min, and heat to 30°C, keep for 80min, then cool down to room temperature naturally;

[0054] S2: acidification reaction, adding dilute hydrochloric acid solution with a mass concentration of 20% to the oxidation reaction solution, adjusting the pH to 7, filtering, beating the solid with absolute ethanol for 4 times, and drying to obtain oxidized-acidified starch;

[0055] S3: Etherification reaction, dissolving the oxidized-acidified starch in absolute ethanol to form a suspension, adjusting the pH of the suspension to 10 with sodium hydroxide solution, feeding nitrogen, and then adding an etherificat...

Embodiment 3

[0063] A kind of modified tapioca starch-polycarboxylate composite water reducing agent, its preparation process comprises the following steps:

[0064] S1: Oxidation reaction, add tapioca starch, sodium hydroxide, ethanol aqueous solution with a volume concentration of 95%, retarder, defoamer, and air-entraining agent to the mixer at the same time, stir evenly at a speed of 950r / min, and heat to 40°C, keep for 30min, then cool down to room temperature naturally;

[0065] S2: acidification reaction, adding dilute hydrochloric acid solution with a mass concentration of 20% to the oxidation reaction solution, adjusting the pH to 7, filtering, beating the solid with absolute ethanol for 4 times, and drying to obtain oxidized-acidified starch;

[0066] S3: Etherification reaction, dissolving the oxidized-acidified starch in absolute ethanol to form a suspension, adjusting the pH of the suspension to 10 with sodium hydroxide solution, feeding nitrogen, and then adding an etherifica...

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Abstract

The invention discloses a preparation process of a modified cassava starch-polycarboxylic acid composite water reducing agent, and belongs to the field of building materials. The composite water reducing agent is prepared through the reaction processes of oxidation, acidification, etherification, grafting, neutralization and the like. The content of the modified cassava starch in the composite water reducing agent reaches 20% or above, and when the mixing amount of the water reducing agent is 0.3%, the coagulation time exceeds 24 h, and the requirement of the super retarder is met; and when the mixing amount of the composite water reducing agent is 1%, the initial fluidity of the cement paste is greater than 200mm. The development and application of the cassava starch water reducing agentare beneficial to improving the processing technology of the water reducing agent, improving the product quality of the water reducing agent and reducing the environmental pollution, and can effectively solve the problem of output of Guangxi agricultural products and improve the additional value of the products.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a preparation process of a modified cassava starch-polycarboxylic acid composite water reducer. Background technique [0002] Water reducing agent is an essential and important component of ready-mixed concrete, and its consumption is increasing year by year with the acceleration of the urban process. In 2014, the output of cement in Guangxi was about 400 million tons, and based on the 0.2% dosage, 800,000 tons of water reducing agents were needed. The development of water reducing agent has provided more space for the development of the concrete industry. However, with the increasing emphasis on environmental protection, people have higher and higher requirements for building materials. While pursuing the realization of performance, they are more concerned about Whether building materials will cause harm to the environment or threaten personal safety, "green" building material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F251/00C08F220/06C08F220/44C08F228/02C08B31/18C04B103/30
CPCC04B24/168C04B2103/302C08B31/18C08B31/185C08F251/00C08F220/06C08F220/44C08F228/02
Inventor 何福强王万宣潘爱美
Owner NANNING TONGCAI TECH CO LTD