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A kind of waterproof and moisture-permeable aqueous polyurethane dispersion and its preparation method and application

A water-based polyurethane, waterproof and moisture-permeable technology, which is applied in polyurea/polyurethane coatings, textiles, papermaking, coatings, etc., can solve the problems of water pressure resistance, resin water pressure resistance, and performance. Simple operation and production process, and the effect of improving moisture permeability

Active Publication Date: 2021-01-15
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, experiments have also found that when the ethoxy group (-EO-) hydrophilic group is on the main chain, although the -EO- segment can play a good role in transmitting water molecules, due to its own Hydrophilicity, with the increase of -EO- segment on the main chain, the water pressure resistance of the resin decreases significantly
When the hydrophilic -EO- group is on the side chain, although the water pressure resistance and moisture permeability can be balanced to a certain extent, when the moisture permeability is improved, the water pressure resistance will often be affected
Therefore, in the case of ensuring a certain water pressure resistance, how to improve the moisture permeability and keep the performance of the fabric from washing for many times does not decrease significantly. These requirements have posed new challenges to relevant researchers.

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
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  • A kind of waterproof and moisture-permeable aqueous polyurethane dispersion and its preparation method and application
  • A kind of waterproof and moisture-permeable aqueous polyurethane dispersion and its preparation method and application
  • A kind of waterproof and moisture-permeable aqueous polyurethane dispersion and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Add 40g of HMDI, 25.2g HDI, 70g N120, 35g PPG2000, 50gPTMEG2000, 15gPTMEG1000, 30gMN3050, after reacting at 80°C for 1h, reached a theoretical NCO% of 6.13%.

[0079] Cool down to 60°C, add 6g BDO, 0.08136g catalyst 8108 and 40g acetone to dilute, stir evenly, heat up to 80°C, react for 4.5-6.5h (start timing at 75°C), and stop the reaction when the theoretical NCO% reaches 2.51%. Cool down to 60°C, add 54g of acetone to dilute, stir and mix for 5 minutes to fully mix the prepolymer and acetone, and continue to cool down to 30-35°C.

[0080] Add 1010 / 292 acetone solution, stir for 5 minutes to make the mixture uniform, stir at 1200-1500 rpm, add 656g of deionized water within 6 minutes.

[0081] Dilute 2g of ethylenediamine and 10g of 1,3-bis[(trimethylol)methylamino]propane with 48g of deionized water, slowly add to the system, react at a constant temperature of 35°C for 5min, and distill the prepared emulsion under reduced pressure Acetone was removed to obtain a...

Embodiment 2

[0083] Add 41g HMDI, 25g HDI, 60g N120, 36g PPG2000, 47gPTMEG2000, 17gPTMEG1000, 30gMN3050, after reacting at 85°C for 1h, reached a theoretical NCO% of 6.53%.

[0084] Cool down to 60°C, add 7g of BDO, 0.0789g of catalyst 8108 and 39.6g of acetone to dilute, stir evenly, heat up to 85°C, react for 4.5-6.5h (start timing at 75°C), and stop the reaction when the theoretical NCO% reaches 2.61%. Cool down to 60°C, add 52.6g of acetone to dilute, stir and mix for 5 minutes to fully mix the prepolymer and acetone, and continue to cool down to 30-35°C.

[0085] Add 1010 / 292 acetone solution, stir for 5 minutes to make the mixture uniform, stir at 1200-1500 rpm, add 637g of deionized water within 6 minutes to obtain a water-based polyurethane dispersion.

[0086] Dilute 2g of ethylenediamine and 10g of 1,3-bis[(trimethylol)methylamino]propane with 48g of deionized water, slowly add to the system, react at a constant temperature of 35°C for 5min, and distill the prepared emulsion ...

Embodiment 3

[0088] Add 38g HMDI, 24g HDI, 80g N120, 50g PPG2000, 60gPTMEG2000, 15gPTMEG1000, 38gMN3050, after reacting at 75°C for 1h, reached a theoretical NCO% of 4.41%.

[0089] Cool down to 60°C, add 3.5g of BDO, 0.09255g of catalyst 8108 and 46g of acetone to dilute, stir evenly, heat up to 75°C, react for 4.5-6.5h (start timing at 75°C), and stop the reaction when the theoretical NCO% reaches 1.89%. Cool down to 60°C, add 61g of acetone to dilute, stir and mix for 5 minutes to fully mix the prepolymer and acetone, and continue to cool down to 30-35°C.

[0090] Add 1010 / 292 acetone solution, stir for 5 minutes to make the mixture uniform, stir at 1200-1500 rpm, add 730 g of deionized water within 6 minutes to obtain a water-based polyurethane dispersion.

[0091] Dilute 4g of isophoronediamine and 10g of 1,3-bis[(trimethylol)methylamino]propane with 56g of deionized water, slowly add to the system, and react at a constant temperature of 35°C for 5min, and the prepared emulsion T...

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Abstract

The invention provides a waterborne polyurethane dispersion body for a waterproof and moisture-permeable fabric coating and a preparation method and a usage thereof. The waterborne polyurethane dispersion body is capable of, through a special micromolecular chain extender, introducing strong hydrophilic hydroxyl lateral groups aggregated in clusters to a main chain, and through the strong hydrophilic hydroxyl lateral groups aggregated in clusters and a weak hydrophilic ether bond on a branched chain, a synergistic effect is formed, thereby being beneficial to one-way movement of moisture in fabric from inside to outside. A problem of mutual restriction between hydraulic pressure and moisture permeability is balanced, and the good waterproof and moisture-permeable property are acquired.

Description

technical field [0001] The invention belongs to the field of water-based polyurethane materials, and in particular relates to a waterproof and moisture-permeable water-based polyurethane dispersion and a preparation method and application thereof. Background technique [0002] With the improvement of people's living standards and the increase of outdoor sports, the requirements for outdoor sportswear are getting higher and higher, and waterproof and moisture-permeable is a major trend. Polyurethane resin is a commonly used waterproof and moisture-permeable resin at present, but the current waterproof and moisture-permeable polyurethane resin still has the problem of poor moisture permeability. [0003] Studies have found that the perspiration of people during activities is 11500g / 24h, and the fabric needs about 4000g / m 2 / 24h corresponds to the moisture permeability; at the same time, in order to achieve the ideal waterproof effect, it is also required that the hydrostatic ...

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
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C09D175/08D06N3/14
CPCC08G18/3206C08G18/3228C08G18/4825C08G18/4833C08G18/4854C08G18/6674C08G18/6677C08G18/6685C09D175/08D06N3/146
Inventor 刘姗赵炳焱王萃萃张洁邓俊英
Owner WANHUA CHEM GRP CO LTD
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