Modified malt syrup retarder as well as preparation method and application thereof

The technology of maltose syrup and retarder is applied in the field of modified maltose syrup retarder and its preparation. The effect of improving workability

Active Publication Date: 2021-08-24
云南森博混凝土外加剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sugar retarders contain a large amount of -OH and -COOH in the molecular structure, so the coagulation accelerator effect is extremely strong, but this kind of retarder has poor high temperature resistance, poor adaptability to water reducing agents, and high dosage will inhibit water reducing , affecting the concrete strength
[0003] In the prior art, sodium gluconate is the retarder with the widest range of use and the most dosage. The dosage is small and the retarding effect is remarkable. However, the sodium gluconate retarder has the hidden danger of overdoping, and the dosage is very sensitive. Insufficient coagulation, super retarded coagulation easily occurs at low temperature, poor adaptability to coarse sand or river sand, high production cost

Method used

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  • Modified malt syrup retarder as well as preparation method and application thereof
  • Modified malt syrup retarder as well as preparation method and application thereof
  • Modified malt syrup retarder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Put 400kg of maltose syrup and 100kg of acrylic acid into the No. 1 reactor, then add 4kg of sodium bicarbonate into the No. 1 reactor, turn on the agitator, raise the temperature to 70-90°C for 4 hours, and cool down to room temperature to obtain the monoester. Then 100kg of monoester, 20kg of methacrylic acid, 20kg of maleic acid, 5kg of hydroxyethyl acrylate, 15kg of diethyl dithiophosphate, 20kg of acrylamide, 1kg of potassium persulfate and 500kg of Put the ionized water into the No. 2 reaction kettle, turn on the agitator, raise the temperature to 85-90°C and stir for 4 hours, cool down to room temperature, then add 8kg of sodium hydroxide solution to adjust the pH to about 7 to obtain the modified maltose syrup retarder.

Embodiment 2

[0038] Put 800kg of maltose syrup and 100kg of acrylic acid into the reactor, then add 4.8kg of concentrated sulfuric acid into the No. 1 reactor, turn on the agitator, raise the temperature to 70-90°C for 4 hours, and cool down to room temperature to obtain the monoester. Then 100kg of monoester, 20kg of acrylic acid, 20kg of maleic acid, 5kg of ethylene glycol dimethacrylate, 15kg of blocked amide phosphate, 20kg of acrylamide, 1kg of ammonium persulfate and 500kg of deionized Put water into No. 2 reactor, turn on the agitator, raise the temperature to 85-90°C and stir for 4 hours, cool down to room temperature, then add 8kg of sodium hydroxide solution to adjust the pH to about 7 to obtain the modified maltose syrup retarder.

Embodiment 3

[0040]Put 800kg of maltose syrup and 100kg of maleic anhydride into No. 1 reactor, then add 9.6kg of caustic soda into No. 1 reactor, start the stirrer, raise the temperature to 70-90°C for 4 hours, cool down to room temperature to obtain single ester. Then the monoester of 200kg, the methacrylic acid of 50kg, the fumaric acid of 30kg, the diethyl dithiophosphate of 10kg, the polyethylene glycol diacrylate of 30kg, the acrylamide of 40kg, the ammonium persulfate of 5kg and Put 750kg of deionized water into the No. 2 reaction kettle, turn on the agitator, raise the temperature to 85-90°C and stir for 4 hours, cool down to room temperature, and then add 15kg of sodium hydroxide solution to adjust the pH to about 7 to obtain the modified maltose syrup. coagulant.

[0041] The mix ratio of concrete is shown in Table 1.

[0042] Table 1

[0043]

[0044] The compounding method of the modified maltose syrup sustained-release agent and the polycarboxylate water reducer as an ad...

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Abstract

The invention discloses a modified maltose syrup retarder as well as a preparation method and application thereof. The modified maltose syrup retarder is prepared from maltose syrup, acrylic acid, an activating agent, unsaturated acid, esters, acrylamide, an initiator, deionized water and liquid caustic soda in a mass part ratio of (79-157):(10-40):(0.5-3.2):(40-80):(20-40):(20-40):(1-5):(500-750):(8-15). The preparation method comprises the following steps: putting malt syrup and acrylic acid into a No.1 reaction kettle according to the mass part ratio of (4-8):1, further adding an activating agent which is 0.5-2% of the total amount of the malt syrup, heating to 70-90 DEG C, stirring and reacting for 4 hours, and cooling to room temperature to obtain an intermediate product A; then adding the intermediate product A, unsaturated acid, esters, acrylamide, an initiator and deionized water in a mass ratio of (100-200):(40-80):(20-40):(20-40):(1-5):(500-750) into a No.2 reaction kettle, heating to 85-90 DEG C, stirring the mixture to react for 4 hours, cooling a reaction product to room temperature, and regulating the pH value to be about 7 by using liquid caustic soda to obtain the modified malt syrup retarder.

Description

technical field [0001] The invention relates to the technical field of retarders for concrete, in particular to a modified maltose syrup retarder and its preparation method and application. Background technique [0002] Since concrete retarder is an admixture that can delay the hydration reaction of cement and will not cause adverse effects on the performance of concrete in the later stage, concrete retarder is widely used in engineering construction. Concrete retarder prolongs the setting time of concrete by delaying the hydration reaction of cement, so that freshly mixed concrete can maintain plasticity for a long time, which is convenient for pouring and improves construction efficiency. According to different chemical compositions, concrete retarders are divided into inorganic concrete retarders and organic concrete retarders. Commonly used retarders include hydroxycarboxylic acids, aminocarboxylic acids, aminocarboxylates, polyols, polyol derivatives and sugars. Sugar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/20C08F220/06C08F222/02C08F220/56C08F222/14C08F283/06C08F222/20C04B24/26C04B103/22
CPCC08F220/20C08F283/065C04B24/2688C04B24/2694C04B40/0039C04B2103/22C08F220/06C08F222/02C08F220/56C08F222/102C08F222/1006C04B2103/302
Inventor 尹才能非荣祥阿光强徐顺涛阿光城徐兴卫
Owner 云南森博混凝土外加剂有限公司
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