Air entraining agent and application thereof in preparation 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 ineffective workability of freshly mixed concrete, toxicity of superplasticizer products, and uneven distribution.

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 an air-entraining agent and a technical solution for its application in the preparation of modified cassava starch-polycarboxylic acid composite water reducer, so as to solve the problem of unreasonable air-entraining agent introduced in the prior art. Unstable, uneven distribution, improper size and other deficiencies, can not effectively solve the problem of workability of freshly mixed concrete
It can also solve the technical problems that the existing water reducer products are toxic, non-biodegradable, and discharge a large amount of toxic waste liquid during the production process, and it is difficult to meet the requirements of green and environmental protection.

Method used

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  • Air entraining agent 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] An air-entraining agent comprising the following components in parts by weight: 48 parts of rosin powder, 55 parts of p-toluenesulfonic acid, 37 parts of sodium hydroxide, 18 parts of pentaerythritol, 7 parts of tall oil and 9 parts of petroleum sulfonate .

[0044] The preparation method of described air-entraining agent, comprises the following steps:

[0045] S1: Put rosin powder, p-toluenesulfonic acid and sodium hydroxide into the reaction kettle to obtain mixture A, add water with 50% of the total mass of mixture A, mix and stir for 30min, heat to 80°C, keep warm for 50min, and heat up to 80°C , keep warm for 45min to obtain mixed solution A;

[0046] S2: Heat the mixture A to 85°C, slowly add pentaerythritol and tall oil, keep it warm for 35 minutes, then raise the temperature to 70°C, slowly add petroleum sulfonate, keep it warm for 1 hour, to obtain the air-entraining agent.

[0047] A modified tapioca starch-polycarboxylic acid composite water reducer, compr...

Embodiment 2

[0057] An air-entraining agent comprising the following components in parts by weight: 52 parts of rosin powder, 44 parts of p-toluenesulfonic acid, 32 parts of sodium hydroxide, 20.5 parts of pentaerythritol, 11 parts of tall oil and 7 parts of petroleum sulfonate .

[0058] The preparation method of described air-entraining agent, comprises the following steps:

[0059] S1: Put rosin powder, p-toluenesulfonic acid and sodium hydroxide into the reaction kettle to obtain mixture A, add water with 50% of the total mass of mixture A, mix and stir for 30min, heat to 80°C, keep warm for 50min, and heat up to 80°C , keep warm for 45min to obtain mixed solution A;

[0060] S2: Raise the temperature of the mixture A to 85°C, slowly add pentaerythritol and tall oil, keep it warm for 35 minutes, then raise the temperature to 85°C, slowly add petroleum sulfonate, keep it warm for 1 hour, to obtain the air-entraining agent.

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

Embodiment 3

[0071] An air-entraining agent comprising the following components in parts by weight: 60 parts of rosin powder, 38 parts of p-toluenesulfonic acid, 25 parts of sodium hydroxide, 22 parts of pentaerythritol, 14 parts of tall oil and 5 parts of petroleum sulfonate .

[0072] The preparation method of described air-entraining agent, comprises the following steps:

[0073] S1: Put rosin powder, p-toluenesulfonic acid and sodium hydroxide into the reaction kettle to obtain mixture A, add water with 50% of the total mass of mixture A, mix and stir for 30min, heat to 80°C, keep warm for 50min, and heat up to 80°C , keep warm for 45min to obtain mixed solution A;

[0074] S2: Heat the mixture A to 85°C, slowly add pentaerythritol and tall oil, keep it warm for 35 minutes, then raise the temperature to 70°C, slowly add petroleum sulfonate, keep it warm for 1 hour, to obtain the air-entraining agent.

[0075] A modified tapioca starch-polycarboxylic acid composite water reducer, comp...

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Abstract

The invention discloses an air entraining agent and application of the air entraining agent in preparation of a modified cassava starch-polycarboxylic acid composite water reducing agent, and belongsto the field of building materials. The air entraining agent is prepared from the following components in parts by weight: 48 to 60 parts of rosin powder, 38 to 55 parts of p-toluenesulfonic acid, 25to 37 parts of sodium hydroxide, 18 to 22 parts of pentaerythritol, 7 to 14 parts of tall oil and 5 to 9 parts of petroleum sulfonate. 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 air entraining agent disclosed by the invention, bubbles in concrete can be proper and stable in size, and meanwhile, the compressive strength of the concrete is remarkably improved. 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 is longer than 24 h, and the requirement of the super retarder is met.

Description

technical field [0001] The invention relates to the field of building materials, in particular to an air-entraining agent and its application in the preparation of modified tapioca starch-polycarboxylic acid composite water reducer. Background technique [0002] In concrete, the use of high-quality air-entraining agents can significantly improve the performance of plastic concrete and hardened concrete, and can also reduce the cost of admixtures and concrete. The research and application of high-quality air-entraining agents is the need and necessity of the development of concrete and its admixtures in my country. The development, promotion and application of air-entraining agents are of far-reaching significance and should be the necessary admixtures for the development of high-performance concrete in the future. However, most existing air-entraining agents have deficiencies such as unreasonable introduction of bubble structure, uneven distribution, unstable bubbles, and in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B24/34C04B103/50C04B103/30
CPCC04B40/0039C04B2103/304C04B2103/50C04B24/34C04B24/20C04B22/062C04B24/02C04B24/08C04B24/16C04B24/38C04B24/42C04B24/085C04B24/32C04B24/10C04B24/06C04B22/16C04B22/0013C04B22/149C04B22/142
Inventor 朱芳雯肖宁珍陈勇龙莺
Owner NANNING TONGCAI TECH CO LTD
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