Waterborne polyurethane dispersion and method for preparing the same

Pending Publication Date: 2022-03-17
DOW GLOBAL TECH LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent provides a unique waterborne polyurethane dispersion and a laminated synthetic leather article made using the dispersion. The waterborne polyurethane dispersion is derived from an isocyanate component, an isocyanate-reactive component, a hydrophilic amino siloxane compound, a catalyst, a surfactant, a chain extender, and water. The dispersion does not contain any cationic or anionic hydrophilic pendant groups. The laminated synthetic leather article comprises a polyurethane skin film, a base layer, and an optional backing substrate. The technical effects of this invention include improved water resistance, flexibility, and durability of the synthetic leather article.

Problems solved by technology

However, the volatile organic solvents are very hazardous to plant operators, consumers and environment.
However, polyester polyol based PUD's have many problems, e.g. poor hydrolysis resistance, high cost and low dispersity in water due to high viscosity of polyester prepolymer).
Polyether polyol based PUD's don't have such problems, but the mechanical properties and anti-stickiness performance are poor due to the intrinsic softness of polyether polyol.
A newly developed technology for producing a synthetic leather is to laminate a externally emulsified skin layer derived from a polyurethane dispersion with a non-solvent 2k PU foam layer, but the skin layer of the laminated synthetic leather exhibits unfavorable anti-stickiness performance which cannot meet the requirements of the synthetic leather application as any slight stickiness in the skin film would not be acceptable to the customer.

Method used

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  • Waterborne polyurethane dispersion and method for preparing the same
  • Waterborne polyurethane dispersion and method for preparing the same
  • Waterborne polyurethane dispersion and method for preparing the same

Examples

Experimental program
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examples

[0103]Some embodiments of the invention will now be described in the following Examples, wherein all parts and percentages are by weight unless otherwise specified.

[0104]The information of the raw materials used in the examples is listed in the following table 1:

TABLE 1Raw materials used in the following examplesRaw MaterialDescriptionSupplierIsophorone diisocyanate (IPDI)Aliphatic isocyanate, functionality = 2EvonikT12Catalyst (organic tin)Air ProductVoranol 222-056 polyolEther polyol, Mw = 2000, EO capped, EODow Chemicalcontent = 12 wt. %, Functionality = 2Voranol 4000LM polyolEther polyol, Mw = 4000, Functionality = 2Dow ChemicalVoranol 4240 polyolEther polyol, Mw = 4000, EO capped, EODow Chemicalcontent = 16.9 wt. %, Functionality = 2Castor oilPolyol, with a OH value of 163 mg—KOH / g, Functionality = 2.7MPEG1000Ether polyol, Mw = 2000, Functionality = 1Sinopharm.Piperazinechain extender, functionality = 2Sinopharm.Sodium dodecyl benzeneSurfactantSinopharmsulfonate (SDBS)Deionized...

##ventive examples 3 to 4

Comparative Example 3 and Inventive Examples 3 to 4

[0133]Comparative Example 3, Inventive Example 3 and Inventive Example 4 were performed by repeating the procedures of the Inventive Example 1, except that the content of the hydrophilic amino siloxane compound (OFX-7700) was adjusted to 1.25 wt %, 3.75 wt % and 5.0 wt %, respectively, and the anti-stickiness rank were as follows:

TABLE 5The formulations and anti-stickiness ranks of theComparative Example 3 and Inventive Examples 3 to 4ComparativeInventiveInventiveExample 3Example 3Example 4OFX-77001.25 wt %3.75 wt %5.0 wt %Anti-stickiness rank211

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Abstract

Provided is a waterborne polyurethane dispersion. The waterborne polyurethane dispersion is prepared in the presence of a hydrophilic amino siloxane compound and exhibits good anti-stickiness while retaining superior mechanical properties. A laminated synthetic leather article prepared with said waterborne polyurethane dispersion as well the method for preparing the synthetic leather article are also provided.

Description

FIELD OF THE INVENTION[0001]The present disclosure relates to a waterborne polyurethane dispersion and a method for preparing the same, a laminated synthetic leather article comprising a skin film derived from the waterborne polyurethane dispersion and a method for preparing the same. The laminated synthetic leather article prepared by said waterborne polyurethane dispersion exhibits superior anti-stickiness and mechanical properties.INTRODUCTION[0002]Synthetic leather gets popular applications in people's daily life, from clothes, footwear, bag and luggage, home upholstery to seats in automobile. It provides similar performance and hand feeling to natural leather with much better cost advantage. Synthetic leather is fabricated by coating polymer(s) on a fabric substrate or impregnating polymer(s) into a fabric substrate, and the most commonly used polymer is polyurethane. Traditional processes are performed with the solution of polyurethane resin(s) in volatile organic solvents suc...

Claims

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Application Information

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IPC IPC(8): C09D175/08C08G18/12C08G18/24C08G18/48C08G18/42C08G18/40C08G18/75C08G18/08D06N3/14D06N3/00B32B5/02B32B27/12B32B27/08B32B27/40B32B5/24B32B5/18
CPCC09D175/08B32B27/20C08G18/24C08G18/4829C08G18/4288C08G18/4804C08G18/4018C08G18/755C08G18/0866D06N3/145D06N3/0095B32B5/02B32B27/12B32B27/08B32B27/40B32B5/245B32B5/18D06N3/005B32B5/024B32B5/022B32B5/026D06N2211/10D06N2211/106D06N2211/14D06N2209/10B32B2437/00B32B2601/00B32B2437/02B32B2307/732B32B2266/0278C08G18/12D06N3/14C08G18/7664C08G18/632C08G18/485C08G18/4072C08G18/3206C08G18/6674C08G18/2063C08G18/36C08G18/283C08G18/4825C08G18/4808C08G18/246C08G2101/00C08G18/61C08G18/3246D06N3/128D06N3/183C08K3/04C08K3/16C08K5/54C08G18/6505C08G18/48B32B2262/0223B32B2262/0238B32B2262/0246B32B2262/0253B32B2262/0261B32B2262/0276B32B2262/065B32B2262/10B32B2262/101C08G18/227C08G18/4812C08J5/18C08J2375/12C09D175/12D06N2211/28Y10T428/24438
InventorHU, XIAOLIANZHANG, CHAOTAI, XIANGYANGFENG, YANLISHI, LILIXIONG, JIAWENMA, BIAO
OwnerDOW GLOBAL TECH LLC