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

A kind of preparation method of hyperbranched shrinkage reducer

A technology of shrinkage reducing agent and hyperbranched polymer, which is applied in the field of preparation of hyperbranched shrinkage reducing agent, can solve the problems of reducing concrete strength, high cost, and flammability, and achieve good shrinkage reduction performance, enhanced flexural strength, and increased flexural strength. Effect

Inactive Publication Date: 2020-11-24
SHAANXI RAILWAY INST
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the shrinkage reducing agents used mainly include alcohols and ethers. Alcohols have a low boiling point, are volatile and flammable, have a large dosage and high cost, and are inconvenient to use in engineering. Ethers are mainly glycol ethers, polyethers, etc. Oxyethylene alkyl ethers are better than alcohols, but most ethers are volatile and have a pungent smell, which is harmful to human health
At the same time, shrinkage reducing agents will reduce the strength of concrete, which has a certain impact on the application and promotion of shrinkage reducing agents

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
  • A kind of preparation method of hyperbranched shrinkage reducer
  • A kind of preparation method of hyperbranched shrinkage reducer
  • A kind of preparation method of hyperbranched shrinkage reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] A preparation method of hyperbranched shrinkage reducer, comprising the steps of:

[0023] S1. Add 10.5g of diethanolamine and 10mL of anhydrous methanol to a 250mL three-necked flask connected with a condenser, slowly add 8.6g of methyl acrylate dropwise at room temperature, under nitrogen protection and magnetic stirring, and wait until the methyl acrylate is added dropwise , continue to stir for 30 minutes, then slowly raise the temperature to 40°C, keep the temperature constant for 4 hours, remove methanol within 30 minutes of vacuuming, and obtain a colorless transparent liquid, that is, obtain N, N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer;

[0024] S2. Using an approved one-step method, add 1.13g of trimethylolpropane, 4.82g of N,N-dihydroxyethyl-3-alanine methyl ester and 0.04g of p-toluenesulfonic acid into a 250mL three-necked flask , heated up to 120°C, mechanically stirred for 2.5 hours under the protection of nitrogen, and vacuumized for 1 h...

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

PropertyMeasurementUnit
shrinkageaaaaaaaaaa
shrinkageaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a hyperbranched shrinkage reducing agent. The preparation method comprises the following steps: firstly, preparing a precursor monomer N,N-dihydroxyethyl-3-aminomethyl acrylate from diethanol amine and methyl acrylate, and then synthesizing hydroxyl-terminated hyperbranched poly(amine-ester)(HPAE) utilizing trimethylolpropane as a reaction central nucleus through an approved one-step method; secondly, synthesizing a micromolecule shrinkage reducing agent SRA from succinic anhydride and polyoxyethylene alkyl ether; and finally, carrying out terminal modification on HPAE by virtue of the micromolecule shrinkage reducing agent SRA, so as to obtain the hyperbranched shrinkage reducing agent HPAE-SRA. According to the preparation method, the micromolecule shrinkage reducing agent SRA is successfully grafted to the surface of an HPAE molecule, the obtained HPAE-SRA is capable of substantially reducing the shrinkage of cement, and the shrinkage reducing rates of mortar in 3d or 28d are respectively 48.8% and 36.6%; and the doping of the shrinkage reducing agent has little influence to compressive strength and is beneficial to the rupture strength.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a preparation method of a hyperbranched shrinkage reducer. Background technique [0002] The shrinkage and cracking of concrete during the setting and hardening process will lead to problems such as frost heave and steel corrosion, which will affect the bearing capacity and stiffness of concrete components. Reducing the shrinkage and cracking of concrete is a technical problem that the cement and concrete industry needs to solve urgently. Adding shrinkage reducing agent is one of the most effective ways to solve this problem. Shrinkage reducing agent mainly reduces shrinkage cracks by reducing the surface tension of capillary water in concrete. At present, the shrinkage reducing agents used mainly include alcohols and ethers. Alcohols have a low boiling point, are volatile and flammable, have a large dosage and high cost, and are inconvenient to use in engineering. Ethers are ...

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 Patents(China)
IPC IPC(8): C08G83/00C04B24/28
CPCC04B24/28C08G83/006
Inventor 彭磊何文敏王闯杨江鹏赵亚丽畅亚文孔令昌郭博丰瑛
Owner SHAANXI RAILWAY INST
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