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

Method of preparing comb block polycarboxylate superplasticizer bonding modified silica fume

A comb-shaped block, polycarboxylic acid technology, applied in the field of cement concrete admixtures, can solve the problems of insignificant increase of steric hindrance effect, insignificant improvement of concrete dispersibility and slump retention, uncontrollable structure, etc. Excellent dispersion retention and stability, improved surface quality, and reduced labor intensity

Active Publication Date: 2015-12-23
WUHAN UNIV OF TECH
View PDF6 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polycarboxylate superplasticizer has a wide molecular weight distribution and uncontrollable structure, so that the steric hindrance effect does not increase significantly, and the dispersion and slump retention of concrete are not significantly improved.

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
  • Method of preparing comb block polycarboxylate superplasticizer bonding modified silica fume
  • Method of preparing comb block polycarboxylate superplasticizer bonding modified silica fume

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: Synthesize RAFT reagent (comb head)

[0031] (1) Prepare 1000ml of 80 / 20 ethanol / deionized water solution and divide equally into two parts;

[0032] (2) Take 500ml of the above solution in flask 1, and add 91.25g TPEG, 9gAA, 5.6g CTA (4-cyanovaleric acid dithiobenzoic acid), 2.6g initiator (4,4' azobis (4-cyanovaleric acid)), make the concentration of TPEG and AA monomers 19.1wt%, dissolve and stir magnetically;

[0033] (3) Adjust the pH to 8;

[0034] (4)N 2 Deoxygenate for 30 minutes, then place flask 1 in a preheated water bath at 70°C for 12 hours;

[0035] (5) Add excess methanol to flask 1, and the product precipitates for 30 minutes;

[0036] (6) Centrifuge the above product for 5 minutes, then freeze-dry for 1 hour to obtain product 1;

[0037] Step 2: Synthesize copolymer (M-PCE)

[0038] (1) Prepare the ethanol solution of AA and KH570: take 6.3gAA and 9.30gKH570 in 10ml ethanol;

[0039] (2) Take 500ml of 80 / 20 ethanol / deionized water solution into flask 2, and ...

Embodiment 2

[0054] The process methods are the same as in Example 1, and the added amounts of various substances are described in the following table:

[0055] Step 1: Synthesize RAFT reagent (comb head)

[0056] Ethanol / deionized water (80 / 20)

TPEG

AA

CTA

Initiator

1000ml

91.25g

9g

5.6g

2.6g

[0057] Step 2: Synthesize copolymer (M-PCE)

[0058] AA

KH570

CTA

Initiator

Acetone / ether (70 / 30)

5.85g

10.86g

5.6g

2.6g

100ml

[0059] The third step: modified silica fume

[0060] Ethanol

Deionized water

Silica Fume

M-PCE

60ml

30ml

5g

11g

[0061] The product obtained is denoted as P2.

[0062] The slump, expansion and compressive strength of concrete are all carried out in accordance with the relevant operations in GB8076-2008 and GB50081-2002.

[0063] The silica fume prepared in the examples was used in the production of commercial concrete. The preparation method was as follows: the raw material ratio was:

[0064] Cement: fly ash: silica fume: water: sand: crushed stone: ad...

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 a method of preparing comb block polycarboxylate superplasticizer bonding modified silica fume. The method comprises the steps that firstly, TPEG and AA are adopted to conduct a reversible addition-fragmentation chain transfer polymerization reaction under the action of chain transfer agents and initiating agents; secondly, the reactant of TPEG and AA and the mixture of AA and KH570 conduct another reversible addition-fragmentation chain transfer polymerization reaction under the action of chain transfer agents and initiating agents; thirdly, the reactant of the above agents reacts with silica fume which is modified by means of surface hydroxylation and then the comb block polycarboxylate superplasticizer bonding modified silica fume can be prepared. The method has the advantages that molecular weight distribution of polycarboxylate superplasticizer becomes narrow and the structure is controllable; the synthetic comb block polycarboxylate superplasticizer and the silica fume subjected to surface hydroxylation bond more easily; the polycarboxylate superplasticizer can be better added to the synthetic comb block polycarboxylate superplasticizer bonding modified silica fume in batch, so labor intensity is reduced, and application of concrete is wider.

Description

Technical field [0001] The invention relates to a method for bonding modified silica fume with a comb-shaped block polycarboxylic acid water reducer, and belongs to the field of cement concrete admixtures. Background technique [0002] With the development of modern science and technology and production, especially the concept of "high-performance concrete", the use of concrete pays more attention to the durability, workability and adaptability of concrete in harsh environments. Due to its submicron spherical size, silica fume can fill capillary pores in high performance concrete and improve the compactness of concrete; at the same time, silica fume has a ball effect in the cement paste, which improves the interaction between water, aggregate and cement particles. Liquidity, etc. In 2012, the 13th Member Congress of the Concrete Admixture Branch of China Building Materials Federation disclosed the characteristics of silica fume and its special effects in cement-based materials. ...

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): C08F293/00C08F220/06C08F8/42C04B24/26C04B103/30
Inventor 黄健王新马保国王允栋稂合清李相国蹇守卫谭洪波
Owner WUHAN UNIV OF TECH
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