Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Low-delayed-coagulation and high-dispersity polycarboxylic acid super plasticizer and preparation method and application thereof

A superplasticizer and high-dispersion technology, applied in the field of superplasticizers, can solve the problems of low cost performance, high viscosity, low conversion rate of esterification, etc., to facilitate the development of early strength, enhance the steric hindrance effect, The effect of accelerated hydration

Active Publication Date: 2017-05-31
国科广化(南雄)新材料研究院有限公司 +1
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can also effectively shorten the setting time of concrete, but polyacrylic acid needs to be synthesized first, which is difficult to prepare and has high cost. Secondly, the viscosity is relatively high, and the conversion rate of esterification with polyether is low, so the amount of admixture is relatively low. high, low price

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
  • Low-delayed-coagulation and high-dispersity polycarboxylic acid super plasticizer and preparation method and application thereof
  • Low-delayed-coagulation and high-dispersity polycarboxylic acid super plasticizer and preparation method and application thereof
  • Low-delayed-coagulation and high-dispersity polycarboxylic acid super plasticizer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Add 77.8g of water and 71.8g of A-1 in sequence to a 250mL four-necked flask equipped with a stirrer, thermometer, nitrogen inlet tube, and dropping device, and raise the temperature to 85°C under nitrogen protection. After stirring evenly, add 1.6g of C- 1. Stir for another 10 minutes, add 7.5g B-1, 0.01g D-1, and 0.44g E-1 aqueous solutions dropwise, the dropping time is 2h and 2.5h respectively, after the dropping is completed, keep warm for 1.5h, and the reaction is over Afterwards, the temperature was slowly lowered to 40° C., and the pH value of the obtained product was adjusted to about 5 with a sodium hydroxide solution having a mass concentration of 30%. Cool to normal temperature, dilute with water to obtain a low-retarding high-dispersion polycarboxylate superplasticizer with a mass concentration of 40%, marked as PCE-1.

Embodiment 2

[0048] Add 79.1g of water and 70.7g of A-2 in sequence to a 250mL four-neck flask equipped with a stirrer, thermometer, nitrogen gas introduction tube, and dropping device, raise the temperature to 65°C under nitrogen protection, stir well, and then add 0.3g of C- 1. Stir for another 10 minutes, add 7.5g B-1, 1.2g B-2 and 0.01g D-1, 0.52g E-1 aqueous solutions dropwise, the dropping time is 2.5h and 3h respectively, keep warm after the dropping is completed After reacting for 1.5 hours, after the reaction was completed, the temperature was slowly lowered to 40° C., and the obtained product was adjusted to a pH value of about 5 with a sodium hydroxide solution having a mass concentration of 30%. Cool to normal temperature, dilute with water to obtain a low-retarding high-dispersion polycarboxylate superplasticizer with a mass concentration of 40%, marked as PCE-2.

Embodiment 3

[0050] Add 76.8g of water and 72.8g of A-3 in sequence to a 250mL four-necked flask equipped with a stirrer, thermometer, nitrogen inlet tube, and dropping device, and raise the temperature to 45°C under the protection of nitrogen. After stirring evenly, add 0.68g of C- 2. Stir for another 10 minutes, add 6.5g B-1, 0.12g D-1, and 0.36g E-1 aqueous solution dropwise, the dropwise addition time is 3h and 3.5h respectively, keep warm for 1h after the dropwise addition, after the reaction , slowly lower the temperature to 40° C., and adjust the pH value of the obtained product to about 5 with a sodium hydroxide solution having a mass concentration of 30%. Cool to normal temperature, dilute with water to obtain a low-retarding high-dispersion polycarboxylate superplasticizer with a mass concentration of 40%, marked as PCE-3.

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 belongs to the field of plasticizer and discloses low-delayed-coagulation and high-dispersity polycarboxylic acid super plasticizer and a preparation method and application thereof. The preparation method includes: adding polyether macromonomer, initiator and water into a reactor, evenly stirring and mixing under nitrogen protection, heating to 10-100 DEG C at the same time, respectively dropwise adding an aqueous solution of small-molecule monomer, a reducing agent and a chain transfer agent, then performing thermal-insulation reaction for 1-6 hours, and neutralizing to obtain the low-delayed-coagulation and high-dispersity polycarboxylic acid super plasticizer, wherein the chain transfer agent is at least one of glycol dimercaptoacetate, trimethylolpropane dimercaptoacetate, pentaerythritol ester dimercaptoacetate and inositol methyl-mercaptopropionate. The preparation method has the advantages that the special chain transfer agent is used to introduce two ester groups to the central position of a main chain, and the prepared low-delayed-coagulation and high-dispersity polycarboxylic acid super plasticizer is excellent in dispersity and is fast in hydration, short in coagulation time and high in early strength during application.

Description

technical field [0001] The invention belongs to the field of superplasticizers, and in particular relates to a low-retardation and high-dispersion polycarboxylate superplasticizer and its preparation method and application. Background technique [0002] Polycarboxylate high-performance water reducer is widely used in the fields of ceramics, cement and gypsum products. It not only has adsorption effect on positively charged particles, but also has steric hindrance effect. For cement particles, it can increase the reaction contact surface between cement and mixing water, and increase the thickness of hydration film in the early stage of hydration reaction, hinder the release of ions in cement particles, reduce the hydration reaction speed, and show retarding effect. [0003] However, in the production process of precast concrete components, the concrete is mixed and poured on site without going through a long-distance transportation process. Such retardation is not good for im...

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): C08F283/06C08F220/06C08F220/56C08F220/58C04B24/26C04B24/16C04B35/634C04B103/32
CPCC04B24/165C04B24/2605C04B24/2658C04B35/63404C04B35/63444C04B2103/32C08F283/065C08F220/585
Inventor 黄健恒庞浩廖兵年福伟
Owner 国科广化(南雄)新材料研究院有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com