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Preparation method of retarder applied to preparation of modified cassava starch-polycarboxylic acid composite water reducing agent

A technology of compound water reducing agent and tapioca starch, applied in the field of building materials, can solve the problems of increasing construction cost and energy consumption, large pollutant discharge, toxicity of water reducing agent and the like

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 propose a method for preparing a retarder applied to the preparation of modified cassava starch-polycarboxylic acid composite superplasticizers, to solve the problems of reducing the later strength of concrete, increasing construction costs and problems of existing retarders. Energy consumption and other issues
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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  • Preparation method of retarder applied to preparation of modified cassava starch-polycarboxylic acid composite water reducing agent

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preparation example Construction

[0031] A preparation method of retarder, comprising the following steps:

[0032] S1: Mix sodium gluconate, sodium citrate, sodium tripolyphosphate, sodium pyrophosphate, ammonium borate and water evenly, and adjust the pH of the solution to 5.5-6.5 to obtain a mixed solution A;

[0033] S2: Add the mixed liquid A into the reaction vessel, add magnesium sulfate, and feed nitrogen 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.

[0034]The retarder includes the following components in parts by weight: 43-60 parts of sodium gluconate, 30-37 parts of sodium citrate, 22-29 parts of sodium tripolyphosphate, 13-19 parts of sodium pyrophosphate, 3-8 parts of ammonium borate, 2-4 parts of ferrous sulfate, and 1-5 parts of magnesium sulfate.

[0035] The retarder comprises the following components in parts by ...

Embodiment 1

[0049] A preparation method of retarder, comprising the following steps:

[0050] 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;

[0051] 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.

[0052] The retarder comprises 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, ferrous sulfate 2 parts, 5 parts of magnesium sulfate.

[0053] The modified tapioca-polycarboxylic acid composite water reducer includes the followin...

Embodiment 2

[0063] A preparation method of retarder, comprising the following steps:

[0064] 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;

[0065] 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.

[0066] The retarder comprises 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, ferrous sulfate 3 parts, 2.5 parts of magnesium sulfate.

[0067] The modified tapioca starch-polycarboxylic acid composite water reducer includes t...

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Abstract

The invention discloses a preparation method of a retarder applied to preparation of a modified cassava starch-polycarboxylic acid composite water reducing agent, and belongs to the field of buildingmaterials. The preparation method of the retarder comprises the following steps: uniformly mixing sodium gluconate, sodium citrate, sodium tripolyphosphate, sodium pyrophosphate, ammonium borate and water, adjusting the pH value of the solution to 5.5-6.5, adding magnesium sulfate, introducing nitrogen, and adding ferrous sulfate at 60 DEG C for free radical polymerization; observing the reactiontemperature, starting timing when the temperature is the highest, and obtaining the retarder after 2 hours. The composite water reducing agent containing the retarder prepared by adopting the processdisclosed by the invention can adjust the setting time of concrete and improve the performance of the concrete, and also has the effects of specifically improving the net slurry fluidity of the concrete, reducing the construction energy consumption and the like.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a method for preparing a retarder applied to the preparation of a modified cassava 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 reduc...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B24/16C04B24/10C04B24/34C04B103/30C04B103/22C04B103/50
CPCC04B24/168C04B40/0039C04B2103/22C04B2103/302C04B2103/304C04B2103/50C04B22/062C04B24/10C04B24/06C04B22/16C04B22/0013C04B22/149C04B22/142C04B24/42C04B24/08C04B24/32C04B24/34C04B24/16C04B24/02C04B24/04
Inventor 裴珂敏李学东杨健王易科
Owner NANNING TONGCAI TECH CO LTD
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