Preparation method for high performance water reducer made from high water reducing solid polycarboxylic acid

A water-reducing type, polycarboxylic acid technology, applied in the field of concrete admixtures, can solve the problems of inability to meet high water reduction and low dosage, and achieve the effects of stable storage, high conversion rate, and improved dispersion.

Active Publication Date: 2015-11-18
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
View PDF4 Cites 34 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent is a pure solid polycarboxylate water reducer prepared by one-step free radical copolymerization of acrylic compounds and unsaturated polyoxyethylene ethers. This invention does not require post-treatment processes such as heating, drying or solvent separation, but uses a The solid polycarboxylate high-performance water reducer synthesized by unsaturated polyoxyethylene ether with different molecular weights still cannot meet the requirements of high water reduction and low dosage.

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
  • Preparation method for high performance water reducer made from high water reducing solid polycarboxylic acid
  • Preparation method for high performance water reducer made from high water reducing solid polycarboxylic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Put 100g of methallyl alcohol polyoxyethylene ether (molecular weight of 2400) and 25g of methallyl alcohol polyoxyethylene ether (molecular weight of 1400) into the kettle, heat to 55°C and melt, then add 0.5g of azobis Isobutyronitrile, then start to drop a mixture of 13g of acrylic acid, 1g of acrylamide and 1g of thioglycolic acid, the dropwise addition time is 2, after the dropwise addition is completed, keep warm at 55°C for 3h, after the reaction is completed, add 1g of sodium hydroxide to adjust the pH to 5.5 , after cooling, it is ground into solid particles.

Embodiment 2

[0022] Put 100g of isobutenyl alcohol polyoxyethylene ether (molecular weight: 2900) and 20g of methallyl alcohol polyoxyethylene ether (molecular weight: 1200) in a kettle, heat to 65°C and melt, then add 0.6g of azobisisoheptanonitrile , and then began to drop a mixture of 15g of acrylic acid, 1.3g of methylolacrylamide and 1.2g of mercaptopropionic acid. The dropwise addition time was 3 hours. The pH is adjusted to 5, and after cooling, it is ground into solid particles.

Embodiment 3

[0024] Put 400g prenyl alcohol polyoxyethylene ether (molecular weight: 3500) and 60g methoxypolyethylene glycol monomethyl ether acrylate (molecular weight: 800) into the kettle, after heating to 60°C for melting, add 3.2g supernatant Ammonium sulfate, then began to drop a mixture of 72g of methacrylic acid, 6g of isopropylacrylamide and 5.2g of sodium hypophosphite, and the time for adding was 5. 5.2g of magnesium hydroxide was used to adjust the pH to 5.3, and after cooling, it was ground into solid particles.

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 present invention relates to a preparation method for high performance water reducer made from high water reducing solid polycarboxylic acid. The prepartion method specifically comprises the following steps: performing heat fusion on two unsaturated polyoxyethylene ether composite macromonomers with different molecular weights; then dropwise adding a mixed liquid of an unsaturated carboxylic micromonomer, an unsaturated amide micromonomer and a chain transfer agent under the reaction of an initiator; and preparing the water reducer through a free radical polymerization reaction, and after the reaction, using a neutralizing agent to adjust a pH value to 5-6 and then cooling and grinding the water reducer in a solid particulate shape. The preparation method provided by the present invention has advantages of being simple in process, high in conversion rate and environmental-friendly and free of pollution, and has the characteristics of high water reduction and low adulterate amount in concrete and dry-mixed mortar, and the transportation cost in long distance transportation is greatly lowered.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a preparation method of a high-water-reducing solid polycarboxylate high-performance water-reducer. Background technique [0002] The synthesis of traditional polycarboxylate superplasticizers is made by free radical polymerization in aqueous solution, and the solid content of the mother liquor product is about 40%, which causes a great cost problem for long-distance transportation. Before using it in dry powder mortar, it needs to be Liquid water reducer products can be used after spray drying, but the energy consumption of the spray drying process is high, and the effective components of the water reducer molecules are reduced during the high temperature process. water rate. [0003] Patent CN103012694A reports a preparation method of polyester-type pure solid polycarboxylate high-performance water reducer. This patent uses (meth)acrylic acid monomers and polyethy...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F290/06C08F220/06C08F220/56C08F220/58C08F220/54C08F2/38C08F2/02C04B24/26C04B103/30
Inventor 仇影丁蓓郭兆来郑春扬姜海东王毅石宇
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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