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
View PDF2 Cites 16 Cited by
  • 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

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

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%.

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

No PUM Login to view more

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

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
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
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