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Preparation of wide compatible, stable and rheologic activating urethane solution

A technology of urea urethane and toluene diisocyanate, which is applied in the field of preparation of urea urethane solution with wide compatibility, storage stability, and rheological activation, and can solve problems such as limited compatibility and poor rheological efficacy , to achieve wide compatibility and high storage stability

Inactive Publication Date: 2002-03-06
BYK CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads firstly to limited compatibility of the coating system used, which is manifested in the gel structure, or to severe haze, and secondly to poor rheological efficacy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1-7: Embodiment 1:

[0029] 0.5 mol (37 g) of n-butanol was added to 1.25 mol (217.5 g) of toluene diisocyanate (80%, 2,4-isomer, hereinafter referred to as T80) at 30°C during 2 hours . The temperature was kept below 45°C. After the addition was complete, stirring was continued for 2 hours until a theoretical NCO content of 33.0% was reached. Excess isocyanate was removed by vacuum (0.1 mbar) distillation at 150 to 170°C. The NCO content is 16.9%, the free TDI content is <0.5%.

Embodiment 2

[0031] 0.25 mol (53 g) of butyltriethylene glycol was added to 0.625 mol (108.75 g) of toluene diisocyanate (T65) at room temperature during 2 hours. The temperature was kept below 45°C. After the addition was complete, stirring was continued for 2.5 hours until a theoretical NCO content of 25.8% was reached. Excess isocyanate was removed by vacuum (0.1 mbar) distillation at 150 to 170°C. The NCO content is 10.9%, the free TDI content is <0.5%.

Embodiment 3

[0033] 0.25 mol (50 g) of isotridecanol was added to 0.75 mol (130.5 g) of toluene diisocyanate (T65) at 40° C. during 2 hours. The temperature was kept below 60°C. After the addition was complete, stirring was continued for 2 hours until a theoretical NCO content of 29.1% was reached. Excess isocyanate was removed by vacuum (0.1 mbar) distillation at 150 to 170°C. The NCO content is 11.3%, and the free TDI content is <0.5%.

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PUM

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Abstract

The invention relates to a process for preparing a solution which comprises urea urethanes and is effective as a thixotropic agent, which involves reacting at least two structurally different monohydroxy compounds with an excess of toluylene diisocyanate to form monoisocyanate adducts, removing the unreacted portion of the toluylene diisocyanate, and reacting the resultant monoisocyanate adducts with diamines in an aprotic solvent in the presence of a lithium salt to form urea urethanes. The invention also relates to the use of the solution to receive thixotropic coating compositions.

Description

technical field [0001] The present invention relates to a process for preparing a solution comprising urea urethane and being effective as a thixotropic agent, comprising reacting a monohydroxy compound with an excess of toluene diisocyanate, removing unreacted toluene diisocyanate from the reaction mixture part, and the monoisocyanate adduct formed is further reacted with a diamine in the presence of a lithium salt in an aprotic solvent to produce a urea urethane. The invention also relates to the use of this solution to contain a thixotropic coating composition. Background technique [0002] To control the rheology of the liquid coating system, mainly organomodified bentonite, silica, hydrogenated castor oil and polyamide waxes are used. The disadvantage of these substances is that they are mostly dry solids, which require the use of solvents and shear forces in the form of semi-finished products, and are added to liquid coating systems under careful temperature control. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G71/04C07B61/00C07C273/18C07C275/40C08G18/22C08G18/28C08G18/32C09D5/04C09D175/04C09K3/00
CPCC08G18/2825C08G18/324C08G18/225C08G18/284C08G18/3225C08G18/282C07C273/1827C09D5/04C07C275/40C08G18/283C08G71/04
Inventor K·豪本尼斯特U·奥尔斯A·沃克H·霍尔特坎普C·布赫曼
Owner BYK CHEM GMBH
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