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Polyurea-carbamate rheology control agent and its preparation method

A urethane and polyurea technology, applied in polyurea/polyurethane adhesives, polyurea/polyurethane coatings, chemical instruments and methods, etc., can solve the problem of expensive, complex diisocyanate, urea-urethane utilization rate limits etc.

Inactive Publication Date: 2004-05-12
BYK CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of these products is that, in the carefully prepared diurea-urethanes, only a small number of reactive urea groups can be incorporated into the molecule, and thus the availability of these urea-urethanes is limited
In addition, subsequent removal of excess diisocyanate by vacuum distillation is a complex and expensive process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In 1.2 moles of benzhydryl diisocyanate (307.3 g) (polyurethane of Suprasec x 1004 exHuntsman; calculated according to DIN EN ISO 9369, NCO content=32.8%), under nitrogen protection, 0.2 Moles of hydrogenated 1,2-polybutadiene diol (309.5 g) (OH number = 72.5; OH number = mg KOH / gram of substance, calculated according to DIN / ISO 4629), were mixed. During the addition, the temperature was maintained constant. When the addition was complete, the mixture was stirred until the theoretical NCO content was 13.6%.

Embodiment 2

[0052] In 1.2 moles of benzhydryl diisocyanate (305.5 grams) (Desmodur 2460 M exBAYER AG; NCO content=33%), under nitrogen protection, drop 0.2 moles of polybutadiene diol (181 g) (OHN=124), mixed. During the addition, the temperature was kept constant. When the addition was complete, the mixture was stirred at T = 40°C until the theoretical NCO content reached 17.3%. Then, the sample was cooled to room temperature.

[0053] Examples 3 to 6 were prepared in the same manner as described in Example 1, and Example 7 was prepared by the method described in Example 2.

[0054]

[0055] Preparation of Urea-Urethane (Invented)

Embodiment 8

[0057] At 60°C, dissolve 337 grams of N-methylpyrrolidone, 20.7 grams of LiNO 3 and 49.2 g of an amine mixture (equivalent = 98.7 g / eq; 44.5 g of benzylamine and 4.9 g of 1,6-diaminohexane). Then, 154.4 g of the NCO prepolymer prepared in Example 1 was added within 1 hour at 80°C. The mixture was stirred for 1 hour after addition, then cooled to room temperature. The resulting urea-urethane solution had a solids content of 40% by weight. A transparent product is obtained which is stable for a relatively long time.

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Abstract

The invention relates to a polymeric urea-urethane obtainable by first reacting a diisocyanate with a polyol to form a doubly NCO-terminated urethane prepolymer. Further reaction is subsequently carried out with a mixture of a primary monoamine and a primary diamine. After the second reaction the polymeric urea-urethane present is substantially free of isocyanate and of the monoamine and diamine used. It can be used as an agent for controlling the rheology of liquid polymers or polymer solutions.

Description

technical field [0001] The present invention relates to polyurea-urethanes in aprotic polar solvents as rheology control agents for liquid polymers or solutions thereof which can be used in a broad sense as coatings, casting compounds, molding compounds, etc. compounds or adhesives. The invention further relates to a process for the preparation of said polyurea-urethanes. Background technique [0002] To influence the rheology of liquid polymer systems, mainly organically modified bentonites, silicas, hydrogenated castor oils and polyamide waxes are used. A disadvantage of these materials is that these materials are generally dry solids which must be mixed into liquid polymer systems in solvated form or by means of careful temperature control, forming semi-finished products by shearing forces. Failure to maintain this temperature can lead to crystallization in the finished coating system, which can lead to coating defects. [0003] A general disadvantage of these rheology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00C08G18/10C08G18/62C08G18/65C08G18/69C08G18/70C09D5/04C09D5/34C09D11/02C09D11/10C09D175/04C09J175/04C09K3/10
CPCC08G18/69C08G18/10C09K3/1021C09D5/34C08G18/6208C09D11/03C09D5/04C08G18/3834C08G18/2865C08G18/3237C08G18/3228C08G18/70
Inventor 卡汉兹·哈班尼斯特史蒂芬·马斯摩萨斯雀·修伯斯贝勒伯·杰特勒赫勒杰·玺里门
Owner BYK CHEM GMBH
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