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

Polyhydroxy air-entraining delayed coagulation type water reducing agent and preparation method thereof

A technology of retarder and water reducing agent, applied in the field of concrete admixtures

Active Publication Date: 2021-04-27
KZJ NEW MATERIALS GROUP CO LTD
View PDF10 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there are few water-reducing agents with both air-entraining and retarding functions. Therefore, the development of a polycarboxylate-based high-performance water-reducing agent with air-entraining and retarding functions is of great significance to the development of concrete admixtures and the concrete industry. Significance

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
  • Polyhydroxy air-entraining delayed coagulation type water reducing agent and preparation method thereof
  • Polyhydroxy air-entraining delayed coagulation type water reducing agent and preparation method thereof
  • Polyhydroxy air-entraining delayed coagulation type water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] The invention provides a method for preparing a polyhydroxy air-entraining retarding water reducer, which comprises the following steps:

[0042] Put vinyl ether macromonomer, retarding monomer, reducing agent and appropriate amount of deionized water in the reactor, stir to dissolve, add unsaturated acid, unsaturated ester and air-entraining monomer dropwise into the reactor The mixed solution, oxidant solution and chain transfer agent solution, and adjust the temperature to 5 ~ 15 ° C to react, the dropwise addition time is 0.5 ~ 1h, after the dropwise addition, keep warm for 0.5 ~ 1.5h, after the reaction, use liquid alkali to adjust the pH to 6 to 7, the polyhydroxy air-entraining retarding water reducer is obtained.

[0043] Wherein, the mass ratio of the ether macromonomer, air-entraining monomer, retarding monomer, unsaturated acid, and unsaturated ester is: (0-200): (1-10): (10-200 ): (10~30): (1~10).

[0044] The vinyl ether macromonomer is preferably 4-hydroxy...

Embodiment 1

[0064] (1) Preparation of air-entraining monomer B1: 0.1 mol of bis(hydroxyethyl)methyl dodecyl ammonium chloride, 0.1 mol of acryloyl chloride, 40 mL of 1,4 dioxane, and 0.1 mol of pyridine were placed in the reaction In the reactor, under the condition of 15°C, the reaction was carried out for 10 h, and the product was purified by vacuum distillation and recrystallization to obtain the air-entraining monomer B1.

[0065] (2) Preparation of retarding monomer C1: 200 parts of molecular weight 4-hydroxybutyl vinyl polyoxyethylene ether-2400, 15 parts of gluconic acid, 1.0 parts of concentrated sulfuric acid and 0.1 part of p-hydroxyanisole were added to In the first reactor equipped with a condensing device, the temperature was maintained at 120°C for 6 hours under the protection of nitrogen, and the temperature was lowered to 40°C after the reaction was completed to obtain retarded monomer C1.

[0066] (3) Copolymerization reaction: 50 parts of 4-hydroxybutyl vinyl polyoxyethy...

Embodiment 2

[0068] Put 200 parts of retarding monomer C1, 1.5 parts of sodium formaldehyde sulfoxylate and appropriate amount of deionized water in the reactor, stir to dissolve, add 20 parts of acrylic acid, 4 parts of 2-methacryloyl A mixed solution of oxyethylphosphorylcholine, 4 parts of air-entraining monomer B1, 2 parts of hydrogen peroxide solution and 1 part of mercaptopropionic acid solution, and adjust the temperature to 15°C for the reaction. The dropping time is 45 minutes. After the completion of the heat preservation for 1.0h, adjust the pH to 6-7 with liquid caustic soda after the reaction, and obtain the polyhydroxy air-entraining polycarboxylate water reducer PCE-2. Wherein, water consumption is the consumption that makes mother liquor solid content be 50%.

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 relates to the technical field of concrete admixtures, particularly to a polyhydroxy air-entraining delayed coagulation type water reducing agent and a preparation method thereof. The water reducing agent comprises a delayed coagulation type polymer, which comprises a polymer or copolymer obtained from monomers, wherein the monomers comprise 1) a delayed coagulation type monomer and an air-entraining type monomer, and 2) at least one of a vinyl ether macromonomer, unsaturated acid and unsaturated ester. By adopting the polyhydroxy air-entraining delayed coagulation type water reducing agent provided by the invention, hydration of cement can be delayed, and bubbles and stable bubbles are introduced into concrete, so that the effects of delayed coagulation and long-acting air entraining are achieved, and the polyhydroxy air-entraining delayed coagulation type water reducing agent has the effects of antibiosis, corrosion prevention, high dispersion and slump loss resistance, and has a wide market application prospect.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a polyhydroxy air-entraining retarding water reducer and a preparation method thereof. Background technique [0002] With the large-scale construction of foundation projects in my country, the requirements for the workability, strength and durability of concrete have been continuously improved, which has promoted the rapid development of concrete admixtures, especially the rapid development of polycarboxylic acid-based high-performance water reducers. . Polycarboxylate-based high-performance water reducer is an important component of concrete admixture. When it is added to concrete, it has a certain air-entraining effect, but the quality of the introduced foam is poor, and the foam stabilization performance is also poor, which cannot meet the requirements of high performance. To meet the demand of concrete durability, it is generally necessary to add air-entraining ag...

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): C08F283/06C08F220/34C08F220/06C08F230/02C04B24/26C04B103/30
CPCC08F283/065C04B24/246C04B2103/302C08F220/34C08F220/06C08F230/02
Inventor 钟丽娜方云辉王昭鹏柯余良张小芳
Owner KZJ NEW MATERIALS GROUP CO LTD
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