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
View PDF0 Cites 20 Cited by
  • Summary
  • 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 exce

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Carbohydrate ester modified polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] A 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 a mixture thereof into the reaction vessel; add unsaturated carboxylic acid compounds such as acrylic acid and methacrylic acid, stir rapidly, and heat up to 60°C to 90°C, respectively. Add concentrated sulfuric acid liquid and a polymerization inhibitor, such as hydroquinone, terephthaloquinone, or a mixture thereof. The reaction is carried out for 2 hours to 6 hours under mechanical stirring conditions.

[0021] (2) Combine the ester compound synthesized in step (1) with unsaturated alcohol polyether, such as isopentenyl polyether (TPEG), isobutenyl polyether (HPEG), acryl polyether (APEG), etc. and deionized water Add reaction device, add initiator, such as ammonium persulfate, sodium persulfate, hydrogen peroxide, peroxyacetic acid, etc., heat up to 40 ℃ ...

Example Embodiment

[0023] Example 1

[0024] 1000g of glucose was added to the reaction vessel, 750g of acrylic acid was added, the temperature was raised to 65°C with rapid stirring, 15g of concentrated sulfuric acid liquid was added respectively, and 3.5g of hydroquinone was added. The reaction was carried out under mechanical stirring for 4 hours. The necessary purification treatment is carried out on the esterified product prepared above.

[0025] Add 50 g of the above-prepared ester compound, 1000 g of isopentenyl polyether (TPEG) with a number average molecular weight of 2400 and deionized water into the reaction device, and under mechanical stirring, the temperature is raised to 60 ° C, and 12 g of ammonium persulfate is added as a copolymerization. As 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, an aqueous sodium hydroxide solution was used to adjust the pH value to 5.0 to 7....

Example Embodiment

[0026] Example 2

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

[0028] Add 60 g of the above-prepared ester compound, 1000 g of isobutenyl polyether (HPEG) with a number-average molecular weight of 2400 and deionized water into the reaction device, and under mechanical stirring, the temperature is raised to 55 ° C, and 15 g of sodium persulfate is added as a co-polymerization agent. As an initiator, 135 g of methacrylic acid was added dropwise at a constant speed, and the dropwise addition time was 4.5 hours. After the reaction, an aqueous sodium hydroxide solution was used to adjust the pH value to 5.0 to 7.5, and deionized water was added...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08F283/06C08F220/06C08F220/32C08F220/28C04B24/26C04B103/30
CPCC08F283/065C04B24/2647C04B2103/302
Inventor 鲁水娟
Owner SHANGHAI TAIJIE CHEM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap