Setting retarder for hydrate-forming binders

a technology of hydrate-forming binders and retarders, which is applied in the field of method, can solve the problems of very fast processing and high cos

Inactive Publication Date: 2014-12-18
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The method produces a setting retarder that effectively extends the processing time of hydrate-forming binders by delaying solidification, offering improved reliability and reproducibility compared to conventional methods.

Problems solved by technology

However, the setting times for these gypsum materials once they have been mixed with water are relatively short, so that, unless additional measures are implemented, processing must be carried out very quickly.

Method used

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  • Setting retarder for hydrate-forming binders

Examples

Experimental program
Comparison scheme
Effect test

production example 3

[0064]In a first process step, 800 g lysine (reactant A) were placed in a reaction vessel at room temperature, and 2000 g water were added with agitation. 50 g Ca(OH)2 were then added. The pH value of the solution following the addition of Ca(OH)2 was between 10 and 11.5. The temperature of the mixture was then adjusted to approximately 45° C.

[0065]In a subsequent process step, partial quantities of succinic acid anhydride (reactant C) and diluted base (50 wt / % NaOH in water) were then added alternatingly, so that the pH value of the reaction solution was held continuously within a range of 8.5-10.5. The temperature during addition was held constant within a range of 40-50° C. The total quantity of succinic acid anhydride added was 552 g, and the total quantity of diluted base added was 650 g. The pH value of the reaction solution once all the succinic acid anhydride and all the diluted base had been added was 7-8.

[0066]The reaction solution was then agitated for approximately 30 mi...

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Abstract

A setting retarder for hydrate-forming binders is produced by reacting a first reactant A, including an amino acid and / or an amino acid derivative, with a second reactant C, including an amine-free carboxylic acid and / or an amine-free carboxylic acid derivative, in a reaction mixture to form a reaction product, the reaction mixture further containing at least one base, and alternatingly adding partial quantities of the at least one base and partial quantities of the second reactant C to the reaction mixture so that the reaction is carried out at a pH value in a range of from 7.5-11.5, wherein the setting retarder is in liquid or solid form.

Description

[0001]This application is a divisional application of U.S. patent application Ser. No. 13 / 978,793 filed Jul. 9, 2013, which is the U.S. national stage of PCT Application No. PCT / EP2012 / 054052 filed Mar. 8, 2012. The entire disclosures of these earlier-filed applications are incorporated herein by reference.FIELD OF THE INVENTION[0002]The invention relates to a method for producing a setting retarder for hydrate-forming binders, and to a corresponding setting retarder. The invention further relates to a binder composition containing a setting retarder and to a method for producing said binder composition. A further aspect of the invention involves the use of the setting retarder to retard the start of setting of hydrate-forming binders.BACKGROUND OF THE INVENTION[0003]Large quantities of hydrate-forming binders, such as cement, lime and gypsum materials, for example, are used in the construction industry.[0004]As gypsum materials, calcined gypsum and plaster are used, either alone or...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C04B24/12C04B28/14
CPCC04B24/124C04B2103/22C04B28/14C04B28/02C04B40/0039C04B40/0042C04B22/062C04B24/04C04B24/123C04B24/287
InventorHAMPEL, CHRISTINAZIMMERMANN, JOERG
OwnerSIKA TECH AG