Multi-branched polycarboxylic water reducer with excellent function of slump protection and preparation method thereof

A technology of branched polycarboxylic acid and superplasticizer, which is applied in the field of multi-branched polycarboxylate superplasticizer and its preparation, which can solve the problem of poor water solubility of crosslinking agent, affecting the state of superplasticizer, and unsatisfactory crosslinking effect, etc. problems, achieve the effects of improved freeze-thaw resistance, far-reaching environmental protection, and improvement of cement sensitivity and unsuitable problems

Active Publication Date: 2010-10-06
浙江五龙新材股份有限公司
View PDF5 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only the production process is cumbersome, but many cross-linking agents have poor water solubility. If the cross-linking effect is not ideal, the state of the water reducing agent will be greatly affected, and turbidit

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
  • Multi-branched polycarboxylic water reducer with excellent function of slump protection and preparation method thereof
  • Multi-branched polycarboxylic water reducer with excellent function of slump protection and preparation method thereof
  • Multi-branched polycarboxylic water reducer with excellent function of slump protection and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] Example 1

[0042] Monomer a 128.8g

[0043] (Maleic anhydride methoxy polyethylene glycol ether diester, the number of EO added is n=13)

[0044] Monomer b 106.7g

[0045] (Methoxy polyethylene glycol methacrylate, the number of EO added is m=28)

[0046] Monomer c 67.9g

[0047] (Propylene alcohol polyoxyethylene ether maleic anhydride ester, the number of EO added is p=28)

[0048] Monomer d 19.6g

[0049] (maleic anhydride)

[0050] Put 268g of water and monomer a into a four-necked reaction flask, purge with nitrogen, heat to 70℃ with an oil bath, and add dropwise aqueous solutions consisting of monomer b, monomer c, monomer d and 48.5 g of water. And 130g of 5% ammonium persulfate aqueous solution. It takes a certain time to add uniformly, and the initiator is added later than the polymerizable monomer aqueous solution. After the dripping is completed, the temperature is kept for 2 hours, the temperature is lowered to 30°C, and the pH value of the reactant is adjusted to 6.0...

Example Embodiment

[0051] Example 2

[0052] Monomer a 128.8g

[0053] (Maleic anhydride methoxy polyethylene glycol ether diester, the number of EO added is n=13)

[0054] Monomer b 127.4g

[0055] (Methoxy polyethylene glycol methacrylate, the number of EO added is m=46)

[0056] Monomer c 65.3g

[0057] (Propylene alcohol polyoxyethylene ether maleic anhydride ester, the number of EO added is p=46)

[0058] Monomer d 21.6g

[0059] (maleic anhydride)

[0060] Put 270g of water and monomer a into a four-necked reaction flask, purge with nitrogen, heat to 70°C with an oil bath, and add dropwise an aqueous solution consisting of monomer b, monomer c, monomer d and 53.6 g of water. 150g 5% sodium persulfate aqueous solution. It takes a certain period of time to add uniformly, and the initiator is added later than the polymerizable monomer aqueous solution. After the dripping is completed, the temperature is kept for 2 hours, the temperature is lowered to, and the pH value of the reactant is adjusted to 6.0-...

Example Embodiment

[0061] Example 3

[0062] Monomer a 128.8g

[0063] (Maleic anhydride methoxy polyethylene glycol ether diester, the number of EO added is n=13)

[0064] Monomer b 130.0g

[0065] (Methoxy polyethylene glycol acrylate, the number of EO added is m=35)

[0066] Monomer c 55.4

[0067] (Propylene alcohol polyoxyethylene ether maleic anhydride ester, the number of EO added is p=28)

[0068] Monomer d 21.6g

[0069] (acrylic acid)

[0070] Put 269g of water and monomer a into a four-necked reaction flask, purge with nitrogen, heat to 35℃ with an oil bath, and add 27.5% of H 2 O 2 3.6 g, respectively, dropwise added an aqueous solution composed of monomer b, monomer c, monomer d and 69 g of water and 125 g of 3% formaldehyde and sodium bisulfite aqueous solution. It takes a certain time to add uniformly, and the initiator is added later than the polymerizable monomer aqueous solution. After the dripping is completed, the temperature is kept for 2 hours, the temperature is lowered to, and the pH...

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
Particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention relates to a plastic retaining agent for newly mixed cement paste, mortar, concrete and the like, in particular to a multi-branched polycarboxylic water reducer with an excellent function of slump protection and a preparation method thereof. The water reducer is prepared with the following monomers through aqueous solution polymerization under the effect of a polymerization initiator: a monomer a of 30-60 percent of the total weight of reactants, a monomer b of 20-50 percent of the total weight of the reactants, a monomer c of 10-30 percent of the total weight of the reactants, and a monomer d of 5-15 percent of the total weight of the reactants. The multi-branched polycarboxylic water reducer still has an excellent performance of maintaining the plasticity of the concrete under the low dosage, and even in construction at the high temperature in summer, the slump loss of the fresh concrete is small, the scope of application in the cement is wide, and no obvious delayed coagulation occurs to the concrete. Therefore, the invention greatly improves the early and late strength of the concrete.

Description

technical field [0001] The invention relates to a plastic retaining agent for freshly mixed cement slurry, mortar, concrete, etc., in particular to a multi-branched polycarboxylate water reducer with excellent slump retention performance and a preparation method thereof. technical background [0002] With the rise and rapid development of a large number of projects such as transportation, water conservancy, bridges, and municipal engineering, concrete, as the most basic material of construction, plays an increasingly important role. Especially in recent years, the construction of some major national projects has increased the performance requirements of concrete according to the design standards of a century-old project. Not only are the requirements for traditional testing indicators constantly increasing, but the durability of concrete and the service life of concrete are more concerned by the construction industry. At the same time, for different projects, the constructi...

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): C08F290/06C08F283/06C08F2/10C04B24/26C04B103/30
Inventor 张建锋王家丰宋永良朱玉莲杨慧芬李秋平
Owner 浙江五龙新材股份有限公司
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