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Derivatized polycarboxylate dispersants

A technology of polycarboxylate and dispersant, which is applied in the field of dispersant for cement composition, and can solve the problems of impractical use of dispersant

Inactive Publication Date: 2004-03-03
CONSTR RES & TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the use of these dispersants impractical
[0020] Another limitation in the prior art is the compressive strength of articles made from cement dry cast mixtures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0056] The molecular weight here is a number average molecular weight.

[0057] The derivatized polycarboxylate dispersants of the present invention are prepared as a solution of a neutral polymer comprising about 40% by weight solids and a neutral pH. Sample O-Linkage #1 contains methoxypolyoxyalkylene glycol with MW about 1100, Sample O-Linkage #2 contains methoxypolyoxyalkylene glycol with MW about 1100, The sample N-linkage contained a methoxypolyoxyalkyleneamine with a MW of about 1000. Fresh and aged solutions were tested at room temperature and for a given period of time. The solution was added to the cement paste in an amount of 0.1% by weight of cement, with a water / cement (W / C) ratio of 0.35. The resulting cement pastes were tested for flow and spreadability.

[0058] mixture

graft polymerization

dispersant

fresh dispersant solution

aged dispersant solution

Dispersant solvent

Liquid life

flow

(g / s)

Spreadab...

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PUM

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Abstract

The present invention is directed to derivatized polycarboxylate dispersants for cementitious mixtures, including those mixtures with high percentages of pozzolan cement replacement and dry cast applications. In particular, the invention is directed to a cementitious mixture comprising cement, including cements with high percentages of pozzolan cement replacement, water, coarse aggregate, fine aggregate, and including a dispersant, wherein said dispersant is a derivatized polycarboxylate dispersant, or combination of polycarboxylate dispersants, which is a derivatized polymer comprising a backbone having moieties derived from (a) an unsaturated hydrocarbon; (b) at least one of a substituted carboxylic acid monomer, a substituted ethylenically unsaturated monomer, and maleic anhydride; and (c) optionally including an N-polyoxyalkylene succinimide; and wherein derivative moieties are pendant to the backbone monomer by at least one ester linkage and at least one amide linkage. The derivatized polycarboxylate dispersant provides for a longer shelf life dispersant, improved dispersability of cementitious mixtures, water reduction in cementitious mixtures, and is an effective dispersant in high pozzolan replaced cementitious mixtures.

Description

field of invention [0001] The present invention relates to dispersants for cement compositions. More particularly, the present invention relates to a derivatized polycarboxylate dispersant for use in dispersing cementitious mixtures having improved stability of solution properties. Background of the invention [0002] Dispersants have been used in the construction industry for dispersing cement mixtures. Dispersants such as sulfonated melamine formaldehyde condensate (SMF) and sulfonated naphthalene formaldehyde condensate (BNS) are commonly used as dispersants. However, undesirably large amounts of these compounds are required to obtain the desired level of concrete workability or water reducing properties. In addition, these materials do not achieve a full range (Types A to F) of water reducing capacity, as defined in ASTM C494. [0003] It is important that dispersants are used in concrete environments where strength and durability are concerned....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K23/52C04B24/26C04B24/32C04B28/02C04B28/04C04B103/40C08F8/30C08F8/32C09K23/34
CPCC04B2103/50Y10S526/932C04B24/267C04B28/04Y10S516/912C04B2103/0059Y10S525/919C08F8/32C04B2103/408Y10S516/915C08F8/44Y02W30/91C04B18/08C04B18/146C04B2103/10C04B14/106C08F212/08C08F222/06
Inventor L·E·布罗维尔J·R·伯里吕润海J·默雷奥J·奥斯本R·帕克-维尔斯J·皮克特S·M·申蒂T·M·维克斯
Owner CONSTR RES & TECH GMBH