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A modified starch concrete air-entraining agent and preparation method thereof

A technology of concrete and air-entraining agent, applied in the field of concrete admixtures, can solve the problems of many steps, depletion of petroleum resources, large pollution, etc., and achieve the effects of good performance, good compatibility and low cost

Active Publication Date: 2022-06-17
山西耀樟建材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of synthetic air-entraining agents is that there are many types and good air-entraining effect. The disadvantage is that its raw materials mainly depend on petrochemical products. There are many steps in the synthesis process, the pollution is relatively large, and the oil resources are facing a crisis of depletion.

Method used

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Examples

Experimental program
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preparation example Construction

[0026] The invention provides a preparation method of a modified starch concrete air-entraining agent. The specific steps are as follows, and the following parts are all parts by mass:

[0027] Step 1: Enzymatic degradation of starch, adding 20-25 parts of starch and 0.3-0.5 parts of high-temperature amylase to 100-150 parts of deionized water, stirring and heating to 70-80° C. for degradation reaction for 1.5-2.5 hours to obtain enzymatic degradation starch.

[0028] Step 2, oxidatively degrading starch, heating the above-mentioned enzymatically degrading starch solution to 90-95° C., adding 1.3-1.7 parts of ammonium persulfate, stirring and maintaining for 3-4 hours to obtain oxidatively degrading starch.

[0029] Step 3: Enzymatic modification of degrading starch, 5-11 parts of 2,4-dihydroxybenzenesulfonic acid, 6-12 parts of 3-aminobenzenesulfonic acid and 1,2-dibutylnaphthalene-6-sulfonic acid Add 4~6 parts of sodium to the above oxidatively degraded starch solution, sti...

Embodiment 1

[0042] Step 1: Enzymatic degradation of starch, adding 20 parts of starch and 0.3 part of high-temperature amylase to 100 parts of deionized water according to parts by mass (the same below), stirring and heating to 70° C. for degradation reaction for 1.5 hours to obtain enzyme-degraded starch.

[0043] Step 2, oxidatively degrading starch, heating the above-mentioned enzymatically degrading starch solution to 90° C., adding 1.3 parts of ammonium persulfate, stirring and maintaining for 3 hours to obtain oxidatively degraded starch.

[0044] Step 3: Enzymatic modification of degrading starch, adding 5 parts of 2,4-dihydroxybenzenesulfonic acid, 6 parts of 3-aminobenzenesulfonic acid and 4 parts of sodium 1,2-dibutylnaphthalene-6-sulfonate; To the above oxidatively degraded starch solution, stir and heat to 35 ° C, add 5 parts of buffer solution to adjust the pH of the system to 6.3, and at the same time add 5 parts of horseradish peroxidase solution with a mass fraction of 0.08...

Embodiment 2

[0048] Step 1: Enzymatic degradation of starch, adding 25 parts of starch and 0.5 part of high-temperature amylase to 150 parts of deionized water according to parts by mass (the same below), stirring and heating to 80° C. for degradation reaction for 2.5 hours to obtain enzyme-degraded starch.

[0049] Step 2, oxidatively degrading starch, heating the above enzymatically degrading starch solution to 95° C., adding 1.7 parts of ammonium persulfate, stirring and maintaining for 4 hours to obtain oxidatively degraded starch.

[0050] Step 3: Enzymatic modification of degrading starch, adding 11 parts of 2,4-dihydroxybenzenesulfonic acid, 12 parts of 3-aminobenzenesulfonic acid and 6 parts of sodium 1,2-dibutylnaphthalene-6-sulfonate; Into the above oxidatively degraded starch solution, stir and heat to 40 ° C, add 8 parts of buffer solution to adjust the pH of the system to 6.5, and at the same time add 10 parts of horseradish peroxidase solution with a mass fraction of 0.16% and...

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Abstract

The invention discloses a modified starch concrete air-entraining agent and a preparation method thereof. Firstly, the starch is degraded enzymatically and oxidatively by high-temperature amylase and hydrogen peroxide to obtain degraded starch, and then 2,4-dihydroxybenzenesulfonic acid is used to degrade the starch. and 3‑aminobenzenesulfonic acid and 1,2‑dibutylnaphthalene‑6‑sodium sulfonate under the catalysis of horseradish peroxidase to graft and modify the degraded starch, and then use methylene under the trigger of ammonium persulfate A modified starch concrete air-entraining agent was prepared by grafting and copolymerizing propyl polyoxyethylene ether. The modified starch air-entraining agent prepared by the invention has side groups with air-entraining function and polyether branched chain with foam-stabilizing function in structure, has strong air-entraining ability, fine and stable introduced foam, and significantly improves the fluidity of mixed concrete and the strength of hardened concrete. Mechanical properties and durability parameters, and the production raw materials and preparation process are environmentally friendly and cost-effective.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to a modified starch concrete air-entraining agent and a preparation method thereof. Background technique [0002] Concrete air-entraining admixture is an admixture that can introduce a large number of small and uniform air bubbles in the concrete mixing process. Improve the strength and durability of hardened concrete such as frost resistance, impermeability and carbonization resistance. Modern concrete engineering puts forward higher requirements for construction properties such as water reduction rate, workability, fluidity, and application properties such as strength and durability. Under the condition that the basic components of concrete are relatively stable, the performance of admixtures such as air-entraining agents used has an important influence on the mixing performance and hardening performance of concrete. The amount of air-entraining agent in concrete is only a fe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F299/02C08B31/18C08B30/12C04B24/38C04B24/26C04B103/30
CPCC08F299/024C08B31/18C08B30/12C04B24/38C04B24/2605C04B2103/304
Inventor 吕生华刘相高党国李宁国赵郁聪何雨涛
Owner 山西耀樟建材有限责任公司