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Retarder and application thereof in preparation of modified cassava starch-polycarboxylic acid composite water reducing agent

A composite water reducing agent and tapioca starch technology, which is applied in the field of building materials, can solve the problems of large pollutant discharge, increased construction cost and energy consumption, and reduced later strength of concrete.

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

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a retarder and a technical solution for its application in the preparation of modified cassava starch-polycarboxylate composite water reducer, so as to solve the problem that the existing retarder will reduce the later strength of concrete and increase the construction efficiency. Issues such as cost and energy consumption
It can also solve the problems of toxicity, non-biodegradability, and large discharge of pollutants in the production process of the existing water reducing agent

Method used

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  • Retarder and application thereof in preparation of modified cassava starch-polycarboxylic acid composite water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A retarder, comprising the following components in parts by weight: 60 parts of sodium gluconate, 30 parts of sodium citrate, 29 parts of sodium tripolyphosphate, 19 parts of sodium pyrophosphate, 3 parts of ammonium borate, 2 parts of ferrous sulfate parts, 5 parts of magnesium sulfate.

[0044] The preparation method of described setting retarder, comprises the following steps:

[0045] S1: Mix sodium gluconate, sodium citrate, sodium tripolyphosphate, sodium pyrophosphate, ammonium borate and water evenly, and adjust the pH of the solution to 5.5 to obtain a mixed solution A;

[0046] S2: Add the mixed solution A into the reaction vessel, add magnesium sulfate, and nitrogen gas at the same time, add ferrous sulfate at 60°C to carry out free radical polymerization; observe the reaction temperature, start timing when the temperature is the highest, and obtain the retarded setting after 2 hours agent.

[0047] A modified tapioca starch-polycarboxylic acid composite wa...

Embodiment 2

[0057] A retarder, comprising the following components in parts by weight: 48 parts of sodium gluconate, 32 parts of sodium citrate, 25 parts of sodium tripolyphosphate, 16 parts of sodium pyrophosphate, 5.5 parts of ammonium borate, 3 parts of ferrous sulfate part, 2.5 parts of magnesium sulfate.

[0058] The preparation method of described setting retarder, comprises the following steps:

[0059] S1: Mix sodium gluconate, sodium citrate, sodium tripolyphosphate, sodium pyrophosphate, ammonium borate and water evenly, and adjust the pH of the solution to 6.5 to obtain a mixed solution A;

[0060] S2: Add the mixed solution A into the reaction vessel, add magnesium sulfate, and nitrogen gas at the same time, add ferrous sulfate at 60°C to carry out free radical polymerization; observe the reaction temperature, start timing when the temperature is the highest, and obtain the retarded setting after 2 hours agent.

[0061] A modified tapioca starch-polycarboxylic acid composite...

Embodiment 3

[0071] A retarder, comprising the following components in parts by weight: 43 parts of sodium gluconate, 37 parts of sodium citrate, 22 parts of sodium tripolyphosphate, 13 parts of sodium pyrophosphate, 8 parts of ammonium borate, 4 parts of ferrous sulfate 1 part, 1 part of magnesium sulfate.

[0072] The preparation method of described setting retarder, comprises the following steps:

[0073] S1: Mix sodium gluconate, sodium citrate, sodium tripolyphosphate, sodium pyrophosphate, ammonium borate and water evenly, and adjust the pH of the solution to 5.5 to obtain a mixed solution A;

[0074] S2: Add the mixed solution A into the reaction vessel, add magnesium sulfate, and nitrogen gas at the same time, add ferrous sulfate at 60°C to carry out free radical polymerization; observe the reaction temperature, start timing when the temperature is the highest, and obtain the retarded setting after 2 hours agent.

[0075] A modified tapioca starch-polycarboxylic acid composite wa...

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Abstract

The invention discloses a retarder and application thereof in preparation of a modified cassava starch-polycarboxylic acid composite water reducing agent, and belongs to the field of building materials. The retarder is prepared from the following components in parts by weight: 43 to 60 parts of sodium gluconate, 30 to 37 parts of sodium citrate, 22 to 29 parts of sodium tripolyphosphate, 13 to 19parts of sodium pyrophosphate, 3 to 8 parts of ammonium borate, 2 to 4 parts of ferrous sulfate and 1 to 3 parts of magnesium sulfate. The cassava starch is subjected to oxidation, acidification, etherification, grafting, neutralization and other reaction processes to prepare the starch-containing composite water reducing agent. By adopting the composite water reducing agent containing the retarder, the setting time of concrete can be adjusted, the performance of the concrete can be improved, and meanwhile, the effects of specifically improving the net slurry fluidity of the concrete, reducingthe construction energy consumption and the like can be achieved. Development and application of the cassava starch water reducing agent are beneficial to improvement of the water reducing agent processing technology, improvement of the water reducing agent product quality and reduction of environmental pollution.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a retarder and its application in the preparation of modified tapioca starch-polycarboxylic acid composite water reducer. Background technique [0002] Retarder is an additive that can delay and reduce the heat release rate of cement hydration, thereby prolonging the time for concrete to fully set, making fresh concrete maintain plasticity for a long time, facilitating pouring, and improving construction efficiency. Retarders can improve the construction performance of concrete. In the production of ready-mixed concrete, it is often necessary to add a certain amount of retarder to keep the fresh concrete plastic for a long time, which is convenient for the transportation and pouring of concrete. At present, there are many kinds of super retarders commonly used in the market, which have different effects on cement concrete, but most of them have the problem of reducing the stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/06C04B24/42
CPCC04B40/0039C04B2103/22C04B2103/302C04B24/06C04B22/16C04B22/08C04B22/142C04B24/38C04B22/062C04B24/42C04B24/32C04B24/34C04B24/20C04B24/026C04B24/08C04B24/16
Inventor 裴珂敏李学东杨健王易科
Owner NANNING TONGCAI TECH CO LTD
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