Aqueous polyurethane emulsion for making waterproof strip and preparation method thereof

A technology of water-based polyurethane and waterproof strips, which is applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problems of few patents and literature reports for water-based polyurethane products, and achieve good waterproof and moisture permeability. The effect of low energy consumption and high bonding fastness

Active Publication Date: 2015-08-26
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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  • Aqueous polyurethane emulsion for making waterproof strip and preparation method thereof

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preparation example Construction

[0043] The above-mentioned preparation method for making the aqueous polyurethane emulsion of waterproof strip, comprises the steps:

[0044] Put the polyol into the reaction kettle, dehydrate it under vacuum for 2 hours at 100-120°C, then lower the temperature to 70°C, add diisocyanate, hydrophilic chain extender, non-hydrophilic chain extender and catalyst, at 80-120°C React at 95°C for 2-4h, after the NCO content reaches the theoretical value, lower the reaction temperature to 30-40°C, add neutralizing agent for neutralization reaction, continue to react for 0.5-1h, add deionized water to emulsify and disperse , and finally add a chain extender containing active hydrogen, and stir for 0.5-1h to react to obtain the water-based polyurethane emulsion for making waterproof strips.

[0045] The catalyst is an organotin catalyst, added in an amount of 0-0.1% of the water-based polyurethane; the neutralizer is triethylamine, added in an amount of 2.5-7% of the water-based polyuret...

Embodiment 1

[0048] A kind of water-based polyurethane emulsion for making waterproof strip described in the present embodiment, its raw material composition is the water-based polyurethane and water that mass ratio is 0.76:1;

[0049] The raw material composition and weight percentage of described aqueous polyurethane are as follows:

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

[0051] (b) 68.7% by weight of polyols (polyethylene adipate-diethylene glycol ester diol 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% chain extender 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 is 1.2.

[0056] The above-mentioned preparation method for making the aqueous polyurethane em...

Embodiment 2

[0060] A kind of water-based polyurethane emulsion for making waterproof strip described in the present embodiment, its raw material composition is the water-based polyurethane and water that mass ratio is 0.51:1;

[0061] The raw material composition and weight percentage of described aqueous polyurethane are as follows:

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

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

[0064] (c) 2.0 wt% 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 is 1.0.

[0068] The above-mentioned preparation method for making the aqueous polyurethane emulsion of waterproof strip, comprises the steps: ...

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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, in particular to a water-based polyurethane emulsion for making waterproof strips and a preparation method thereof. Background technique [0002] Waterproof strips are designed to meet the waterproof concept of clothing, shoes and outdoor products. This type of product is mainly used in waterproofing of PU and PVC coated fabrics, waterproofing and windproofing of seams of cold-proof clothing and its products. At present, such products are mainly prepared by oily polyurethane. In the preparation process, a large amount of aromatic hydrocarbon organic solvents are consumed, which causes great environmental pollution. Generally, it is necessary to prepare polyurethane elastomer first, and then cast it into a film. The process is complicated in this way. It is necessary to recycle organic solvents, which is easy to cause environmental pollution and consumes a lot of energy; at present, the...

Claims

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Application Information

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Patent Type & Authority Patents(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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