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Alkylene carbonates as water glass cure accelerants

A kind of alkylene carbonate, ethylene carbonate technology, applied in the curing field of adhesive mixture

Inactive Publication Date: 2006-12-06
HUNTSMAN PETROCHEMICAL LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the use of EC enriched EC or EC / PC blends is problematic if fast curing is desired

Method used

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  • Alkylene carbonates as water glass cure accelerants
  • Alkylene carbonates as water glass cure accelerants
  • Alkylene carbonates as water glass cure accelerants

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Embodiment Construction

[0008] The problems associated with the use of EC-containing sodium silicate cure accelerators stemming from the relatively high freezing point of EC are alleviated by the present invention, i.e., the combination of PC with another ethylene carbonate known as glycerol carbonate (hereinafter "GC") A mixture of alkyl esters accelerates the cure of the sodium silicate to about the same extent as pure ethylene carbonate. However, unlike EC, GC does not disadvantageously freeze above -40°C. Accordingly, the present invention provides a blend of GC and PC that provides a wide range of commercial cure times while remaining liquid over a wider temperature range than prior art cure accelerators.

[0009] It is known that the order of reactivity between alkylene carbonate and amine is EC>PC>BC. Therefore, the prior art teaches that the reactivity of carbonates with amines decreases with the size of the substituents attached to the carbonate ring, so that, given its molecular structure,...

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Abstract

Provided herein are catalysts useful in the curing of cementitious mixtures, which catalysts comprise one or more alkylene carbonates in combination with glycerin carbonate. Through use of a catalyst according to the present invention, cementitious mixtures containing sodium silicate may be cured at low temperatures because the catalysts of the invention function well at low temperatures, even though they contain ethylene carbonate, a material whose melting point of 36 DEG C otherwise precludes its use as a cure accelerant for silicates.

Description

technical field [0001] The present invention relates to the curing of adhesive mixtures. More specifically, the present invention relates to the curing of adhesive systems containing sodium silicate and cure rate accelerators useful in such systems. Background technique [0002] It is known that alkylene carbonates such as ethylene carbonate, propylene carbonate and butylene carbonate (hereinafter referred to as EC, PC and BC, respectively) strengthen aqueous sodium silicate such as water glass in castings used in the manufacture of various molded articles. Cure rate when using sand binder. The degree of cure intensification depends on the type of alkylene carbonate used. For example, the strengthening order observed for the aforementioned alkylene carbonates is EC>PC>BC, that is, on an equimolar basis, ethylene carbonate makes a given system Cures faster. This difference in reactivity of the alternative alkylene carbonates allows them to be preferentially used to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/04C04B28/26
CPCC04B2103/10C04B28/26C03C3/076C04B2111/00215C04B24/045C04B28/00
Inventor J·H·克莱门茨K·达拉加斯H·P·克莱因
Owner HUNTSMAN PETROCHEMICAL LLC