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Waterborne polyurethane emulsion for making waterproof strip and preparation method thereof

A water-based polyurethane and waterproof strip technology, applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problems that water-based polyurethane products have few patents and literature reports, and achieve good waterproof and moisture permeability. The effect of soft bonding and high adhesion fastness

Active Publication Date: 2013-04-10
广东宏昌新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, quite a lot of research work has been done on water-based polyurethane products at home and abroad, but there are few patents and literature reports on water-based polyurethane products for waterproof strips

Method used

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  • Waterborne polyurethane emulsion for making waterproof strip and preparation method thereof

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preparation example Construction

[0043] The above-mentioned preparation method of the water-based polyurethane emulsion for making waterproof strips comprises the following steps:

[0044] The polyol is added to the reactor, at 100-120 ° C, vacuum dehydration 2h, then the temperature is reduced to 70 ° C, add diisocyanate, hydrophilic chain extender, non-hydrophilic chain extender and catalyzer, at 80- React 2-4h at 95 ℃, after NCO content reaches the theoretical value, the temperature of reaction is reduced to 30-40 ℃, add neutralizer to carry out neutralization reaction, after continuous reaction 0.5-1h, be included in deionized water emulsification and dispersion , finally adding a chain extender containing active hydrogen, and stirring and reacting for 0.5-1 h to obtain the water-based polyurethane emulsion for making waterproof strips.

[0045] The catalyst is an organotin catalyst, and the added amount is 0-0.1% of the amount of the water-based polyurethane; the neutralizing agent is triethylamine, and ...

Embodiment 1

[0048] The water-based polyurethane emulsion described in this embodiment for making waterproof strips is composed of water-based polyurethane and water with a mass ratio of 0.76:1;

[0049] The raw material composition of described water-based polyurethane and its weight percentage are as follows:

[0050] (a) 24.1 wt% of diisocyanates (toluene diisocyanate and 1,6-hexamethylene diisocyanate);

[0051] (b) 68.7 wt % of polyols (polyethylene adipate-diethylene glycol and polytetrahydrofuran diol);

[0052] (c) 3.1 wt% non-hydrophilic chain extender (ethylene glycol);

[0053] (d) 4.1 wt% hydrophilic chain extender (dimethylolpropionic acid);

[0054] (e) 0% of chain extenders containing active hydrogen; the sum of the above raw materials is 100%;

[0055] The molar ratio of isocyanate groups to hydroxyl groups in the above raw materials was 1.2.

[0056] The above-mentioned preparation method of the water-based polyurethane emulsion for making waterproof strips comprises t...

Embodiment 2

[0060] The water-based polyurethane emulsion described in this embodiment for making waterproof strips is composed of water-based polyurethane and water with a mass ratio of 0.51:1;

[0061] The raw material composition of described water-based polyurethane and its weight percentage are as follows:

[0062] (a) 22.5 wt % of diisocyanate (isophorone diisocyanate);

[0063] (b) 70.2 wt% polyols (polybutylene adipate diol and polyoxyethylene diol);

[0064] (c) 2.0 wt% of a non-hydrophilic chain extender (1,4-butanediol);

[0065] (d) 3.9 wt% hydrophilic chain extender (dimethylolpropionic acid);

[0066] (e) 1.4% active hydrogen-containing chain extender (ethylenediamine); the sum of the above raw materials is 100%;

[0067] The molar ratio of isocyanate groups to hydroxyl groups in the above raw materials was 1.0.

[0068] The above-mentioned preparation method of the water-based polyurethane emulsion for making waterproof strips comprises the following steps:

[0069] Add...

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Abstract

The invention discloses waterborne polyurethane emulsion for making a waterproof strip. The emulsion comprises waterborne polyurethane and water according to the mass ratio of 0.5-0.9 to 1, wherein the waterborne polyurethane comprises the following components in percentage by weight: (a) 8-50% of diisocyanate, (b) 25-80% of polyhydric alcohol, (c) 0-10% of non-hydrophilic chain extender, (d) 0.5-15% of hydrophilic chain extender, and (e) 0-8% of active hydrogen-containing chain extender; the total weight percentage of the components is 100%; and the molar ratio of isocyanate group NCO to hydroxyl group OH in the components of the waterborne polyurethane is 2-5 to 1. The waterborne polyurethane emulsion does not contain or only contains a very small amount of volatile organic solvent, has the solid content of 25-50%, is lower in viscosity and can be used for making the waterproof strip after high-speed film coating and curing; and the waterproof strip has the characteristics of high bonding degree, high strength, soft bonding part, good waterproof and moisture-permeable performance and the like.

Description

technical field [0001] The invention belongs to the technical field of hot melt adhesives, and in particular relates to an aqueous polyurethane emulsion for making waterproof strips and a preparation method thereof. Background technique [0002] Waterproof strips are born to match the waterproof concept of clothing, shoes and outdoor products. This type of product is mainly used for waterproofing of PU and PVC coated fabrics, waterproofing and windproofing of needle seams of cold-proof clothing and its products. At present, such products are mainly prepared by oil-based polyurethane. In the preparation process, a large amount of aromatic hydrocarbon organic solvents are consumed, which causes great environmental pollution. Generally, polyurethane elastomers need to be prepared first, and then cast to form films. The process is complicated in this way. It is necessary to recover the organic solvent, which is easy to cause environmental pollution and consumes a lot of energy; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/73C08G18/66C08G18/42C08G18/48C09J175/06
Inventor 任清刚吴伟卿
Owner 广东宏昌新材料科技有限公司
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