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

Water-retaining shrinkage-reducing polycarboxylic acid water reducing agent and preparation method thereof

A technology of polycarboxylic acid and water retention, applied in the field of water reducing agent, can solve the problems of complex synthesis process and large increase in engineering cost

Active Publication Date: 2017-01-04
浙江红墙材料科技有限公司
View PDF2 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] Although the use of these shrinkage reducing agents reduces the shrinkage of concrete to a certain extent, the engineering cost increases greatly and the synthesis process is complicated.

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
  • Water-retaining shrinkage-reducing polycarboxylic acid water reducing agent and preparation method thereof
  • Water-retaining shrinkage-reducing polycarboxylic acid water reducing agent and preparation method thereof
  • Water-retaining shrinkage-reducing polycarboxylic acid water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] An embodiment of the preparation method of the water-retaining shrinkage-reducing polycarboxylate superplasticizer of the present invention comprises the following steps:

[0081] (1) In a closed autoclave, replace the air in the reactor with high-purity nitrogen repeatedly twice, inject 1 mol of propylene alcohol and 0.2 g of catalyst NaOH, raise the temperature of the reactor to 100-115 ° C, and start slowly dropwise adding 1 mol of ring Oxygen, so that the reaction temperature is controlled within the range of 70°C, the pressure in the kettle is controlled at 0.2MPa, and the amount of ethylene oxide required for dropwise addition is controlled by the decrement method. After the dropwise addition of ethylene oxide is completed, the temperature Controlling at 80°C, the reaction was continued for 5h to obtain an intermediate product with the desired molecular weight.

[0082] (2) Keep the temperature at 80°C, start to slowly add 1mol of glycidol dropwise, and control th...

Embodiment 2

[0085] An embodiment of the preparation method of the water-retaining shrinkage-reducing polycarboxylate superplasticizer of the present invention comprises the following steps:

[0086] (1) In a closed autoclave, replace the air in the reactor with high-purity nitrogen repeatedly for 3 times, inject 1mol of prenyl alcohol and 0.5gmol of catalyst KOH, raise the temperature of the reactor to 110°C, and start to slowly add 40mol of ring Oxygen, so that the reaction temperature is controlled within the range of 115°C, the pressure in the kettle is controlled at 0.4MPa, and the amount of ethylene oxide required for dropwise addition is controlled by the decrement method. After the dropwise addition of ethylene oxide is completed, the temperature Controlling at 110°C, the reaction was continued for 2h to obtain an intermediate product with the desired molecular weight.

[0087] (2) Lower the temperature to 80° C., start to slowly add 2 mol of glycidol dropwise, and control the drop...

Embodiment 3

[0090] An embodiment of the preparation method of the water-retaining shrinkage-reducing polycarboxylate superplasticizer of the present invention comprises the following steps:

[0091] (1) In a closed autoclave, replace the air in the reactor with high-purity nitrogen repeatedly twice, inject 1mol of isobutenol and 2g of catalyst potassium carbonate, raise the temperature of the reactor to 115°C, and slowly add 80mol of ethylene oxide dropwise Alkanes, so that the reaction temperature is controlled within the range of 130 °C, the pressure in the kettle is controlled at 0.6MPa, and the amount of ethylene oxide required for dropwise addition is controlled by the decrement method. After the dropwise addition of ethylene oxide is completed, the temperature is controlled at At 120°C, the reaction was continued for 0.5h to obtain an intermediate product with the desired molecular weight.

[0092] (2) Lower the temperature to 80° C., start to slowly add 3 mol of glycidol dropwise, ...

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 provides a water-retaining shrinkage-reducing polycarboxylic acid water reducing agent. The water-retaining shrinkage-reducing polycarboxylic acid water reducing agent can obviously increase the viscosity of a solution, delay the evaporation rate of water molecules and enhance the water retention property of the solution. Concrete shrinkage reducing test results show that the water-retaining shrinkage-reducing polycarboxylic acid water reducing agent has favorable shrinkage reducing effect; compared with common ether polycarboxylic acid water reducing agents from our company, the 28d shrinkage reducing rate ratio of concrete is lowered by 79%; and when the water-retaining shrinkage-reducing polycarboxylic acid water reducing agent is used for concrete, no influence is made to the workability and strength of the concrete, and the cost performance is high. The invention also provides a preparation method of the water-retaining shrinkage-reducing polycarboxylic acid water reducing agent. The method is simple, accessible in raw materials, low in cost and high in cost performance.

Description

technical field [0001] The invention relates to a water reducer, in particular to a water-retaining shrinkage-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] The emergence, development and wide application of concrete admixtures have endowed concrete with new vitality. Water reducing agents mixed into fresh concrete can destroy the flocculation structure of cement particles and play a role in dispersing cement particles and cement hydration particles. Thereby releasing the free water in the flocculation structure and increasing the fluidity of the concrete mixture. Polycarboxylic acid (PCEs) superplasticizers are anionic surfactants, which are mixed into cement paste, adsorbed on the surface of cement particles with cations, and dissociate into organic anion groups with hydrophilic and lipophilic effects. [0003] The molecular skeleton of PCEs superplasticizer consists of a main chain and more branched chains. The mai...

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): C08F283/06C08F220/06C08G65/331C08G65/28C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08G65/2609C08G65/3318C08F220/06
Inventor 张小富白淑英赵利华
Owner 浙江红墙材料科技有限公司
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com