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High solid polyurethane-polyurea dispersoid

A dispersion, water-based polyurethane technology, used in polyurea/polyurethane coatings, devices for coating liquids on surfaces, coatings, etc., can solve the problems of falling solid content, rising viscosity, insufficient performance and stability, etc.

Inactive Publication Date: 2006-07-12
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the particles are too small, the solids content drops and / or the viscosity increases; if the particles are too large, the viscosity increases and performance and stability are not sufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0061] The preparation of the polyurethane prepolymers can be carried out simultaneously with the partial or complete salt formation of the anionic and / or cationic dispersing groups, or subsequently, if this reaction has not already taken place in the starting molecule. To form anionic groups, bases such as tertiary amines are used. Examples include trialkylamines containing 1 to 12, preferably 1 to 6 carbon atoms in each alkyl group, such as trimethylamine, triethylamine, methyldiethylamine, tripropylamine, N-methylamine morpholine, methyldiisopropylamine, ethyldiisopropylamine and diisopropylethylamine. The alkyl groups may also contain hydroxyl groups, as in the dialkylmonoalkanolamines, alkyldialkanolamines and trialkanolamines. As neutralizing agents, inorganic bases such as ammonia or sodium and / or potassium hydroxide may optionally also be used. Preference is given to triethylamine, triethanolamine, dimethylethanolamine or diisopropylethylamine.

[0062] Based on the...

Embodiment 1

[0096] Example 1 : comparative example, PU dispersion (component I)

[0097] Impranil(R) DLN: an anionic hydrophilic unimodal PU dispersion based on polyester with a solids content of 40% and an average particle size of 100 nm to 300 nm, Bayer AG, Leverkusen, Germany.

Embodiment 2

[0099] 2210.0 g of a difunctional polyester polyol (number average molecular weight 1700 g / mol, OH number 66) prepared from adipic acid, neopentyl glycol and hexanediol was heated to 65°C. Subsequently, a mixture of 195.5 g of hexamethylene diisocyanate and 258.3 g of isophorone diisocyanate was added within 5 minutes at 65° C., and the mixture was stirred at 100° C. until a theoretical NCO content of 3.24% was reached. The finished prepolymer was dissolved in 4800 g of acetone at 50° C. and then a solution of 29.7 g of ethylenediamine, 95.7 g of disulfamic acid salt and 602 g of water was metered in within 5 minutes. This was followed by stirring for 15 minutes. After this, within 20 minutes, 1169 g of water were added for dispersion. The solvent was subsequently removed by vacuum distillation, resulting in a storage-stable bimodal PU dispersion with a solids content of 60%. The solid fraction of the dispersion consisted of 31% fine fraction and 69% coarse fraction. The ma...

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PUM

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Abstract

The present invention relates to aqueous polyurethane-polyurea dispersions having two discrete maxima in the particle size distribution, wherein the maximum of the fine fraction is between 51 and 150 nm and the maximum of the coarse fraction is between 160 and 700 nm. The present invention also relates to a process for preparing the polyurethane-polyurea dispersions, to coating compositions containing these polyurethane-polyurea dispersions, and to coated substrates prepared from these coating compositions.

Description

[0001] background technical field [0002] The present invention relates to bimodal, high solids polyurethane dispersions, to a process for their preparation and to their use. Background technique [0003] Substrates are increasingly coated with aqueous adhesives, especially polyurethane-polyurea (PU) dispersions. The preparation of aqueous PU dispersions is known. Unlike many other kinds of aqueous adhesives, PU dispersions are particularly superior in terms of high resistance to chemicals and water, high mechanical strength, and high tensile strength and high ductility. Existing polyurethane-polyurea dispersions largely meet these needs. The systems described here are self-emulsifying due to the presence of hydrophilic groups, ie they are dispersible in water without the addition of external emulsifiers and have a unimodal particle size distribution. So the viscosity of these dispersions can be kept within an acceptable range for maintaining ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/48C08G18/72C09D175/04D06M15/564B05D7/12C08G18/00
CPCC08G18/6659C08G18/0823C08G18/0828C08G18/10C08G18/12C08G18/283C08G18/4238C08G18/44C08G18/755C09D175/04C08G18/3228C08G18/3857C08G18/3855C08G18/3231C08G18/305C08G18/3225C09D175/00C08L75/00
Inventor T·里谢尔G·库雷克H·卡斯尔曼T·费勒T·芒兹梅D·-I·舒策H·布卢姆H·-G·穆勒
Owner BAYER MATERIALSCIENCE AG