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Carbohydrate ester modified polycarboxylate superplasticizer and preparation method thereof

A technology of esterification and polycarboxylic acid, which is applied in the field of construction admixtures, can solve problems such as easy mildew of construction admixtures, segregation of concrete aggregate and slurry, negative impact on building strength, etc., to achieve outstanding substantive features, The effect of prolonging the initial setting time and prolonging the final setting time

Inactive Publication Date: 2017-01-04
SHANGHAI TAIJIE CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, a certain amount of retarder, such as calcium gluconate, sodium gluconate, sodium citrate, etc., is often added to Yu Zhihong concrete without achieving the purpose of retarding the setting for a longer period of time. Prolong the initial setting time and final setting time to a certain extent, but excessive use will lead to segregation of concrete aggregate and slurry, affecting the use of concrete, and negatively affecting the strength of the cured building
In addition, the direct addition of polyhydric organic small molecules will cause the compounded building admixture to be prone to mildew and affect the storage time

Method used

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  • Carbohydrate ester modified polycarboxylate superplasticizer and preparation method thereof

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preparation example Construction

[0019] The first aspect of the present invention provides a method for preparing a solid polycarboxylate water reducer, comprising the following steps:

[0020] (1) Add sugar compounds, such as glucose, maltose, sucrose, or their mixtures, into the reaction vessel; add unsaturated carboxylic acid compounds, such as acrylic acid and methacrylic acid, stir rapidly, and heat up to 60 ° C ~ 90 ° C, respectively Add concentrated sulfuric acid liquid and a polymerization inhibitor such as hydroquinone, p-quinone or a mixture thereof. Under the condition of mechanical stirring, react for 2 hours to 6 hours.

[0021] (2) Combine the esterified product synthesized in step (1) with unsaturated alcohol polyether, such as isopentenyl polyether (TPEG), isobutenyl polyether (HPEG), acryl polyether (APEG), etc., and deionized water Add the reaction device, add initiators, such as ammonium persulfate, sodium persulfate, hydrogen peroxide, peracetic acid, etc., raise the temperature to 40 ° C...

Embodiment 1

[0024] Add 1000g of glucose and 750g of acrylic acid to the reaction vessel, stir rapidly, raise the temperature to 65°C, add 15g of concentrated sulfuric acid liquid, and add 3.5g of hydroquinone. The reaction was carried out for 4 hours under mechanical stirring. Perform necessary purification treatment on the esterified product prepared above.

[0025] Add 50 g of the above-prepared esterified product, 1000 g of isopentenyl polyether (TPEG) with a number average molecular weight of 2400 and deionized water into the reaction device, raise the temperature to 60 ° C under mechanical stirring conditions, and add 12 g of ammonium persulfate as a copolymerization For the initiator of the reaction, 120 g of acrylic acid was added dropwise at a constant speed, and the dropwise addition time was 4 hours. After the reaction, use aqueous sodium hydroxide solution to adjust the pH value to 5.0-7.5, and add deionized water to adjust the concentration to 20%.

Embodiment 2

[0027] Add 1000g of sucrose and 700g of methacrylic acid to the reaction vessel, stir rapidly, raise the temperature to 70°C, add 20g of concentrated sulfuric acid liquid, and add 4.5g of hydroquinone. The reaction was carried out for 3 hours under the condition of mechanical stirring. Perform necessary purification treatment on the esterified product prepared above.

[0028] Add 60g of the above-prepared esterified product, 1000g of isobutenyl polyether (HPEG) with a number average molecular weight of 2400 and deionized water into the reaction device, raise the temperature to 55°C under mechanical stirring, and add 15g of sodium persulfate as a starting point for the copolymerization reaction. Initiator, 135g of methacrylic acid was added dropwise at a constant speed, and the dropping time was 4.5 hours. After the reaction, use aqueous sodium hydroxide solution to adjust the pH value to 5.0-7.5, and add deionized water to adjust the concentration to 20%.

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Abstract

The invention provides a carbohydrate ester modified polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises the following steps of adding unsaturated carboxylic acid and dried polyhydroxyl saccharide compounds, performing an esterification reaction under a concentrated sulphuric acid catalysis condition, wherein a certain proportion of a polymerization inhibitor also needs to be added so as to prevent the unsaturated carboxylic acid from self-polymerization in a reaction process, and after the esterification reaction is finished, enabling esterification products, the unsaturated carboxylic acid and unsaturated alcohol polyether to be subjected to a copolymerization reaction so as to prepare a delayed coagulation type polycarboxylate superplasticizer containing polyhydroxyl functional groups.

Description

technical field [0001] The invention belongs to the field of construction admixtures, in particular to a sugar ester modified polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is currently the largest and most widely used construction admixture. It has become one of the necessary components in some engineering categories, such as hydropower projects, high-speed railway projects, nuclear power projects, and super high-rise buildings. With the continuous development of concrete construction projects, the requirements for construction admixtures are also increasing. For example, with the expansion of cities and the trend of concrete mixing stations away from urban core areas, the transportation distance of precast concrete is significantly extended, so for Polycarboxylate superplasticizers put forward higher requirements for retarding and plastic performance. [0003] The general polycarboxylate super...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/32C08F220/28C04B24/26C04B103/30
CPCC08F283/065C04B24/2647C04B2103/302
Inventor 鲁水娟
Owner SHANGHAI TAIJIE CHEM
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