Aqueous polyurethane dispersoid for synthetic leather adhesive and preparation method thereof

A water-based polyurethane and dispersion technology, which is applied in the direction of adhesive types, polyurea/polyurethane adhesives, adhesives, etc., can solve the problem of difficult to grasp the semi-dry pasting process, the decrease of the bonding strength, and the poor bonding effect of the adhesive To achieve the effects of reducing adverse effects on human body and environment, reducing use and emissions, and achieving good jungle test results

Active Publication Date: 2014-09-10
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN 101665675A discloses a preparation method of a water-based polyurethane adhesive and superfine fiber synthetic leather; Due to the problem of poor bonding effect, the mixed MDI system is used instead of pure TDI to prepare, which has better initial viscosity, resilience and higher final strength; the patent does not mention the wet bonding effect, solvent resistance and jungle test results.
However, for the existing water-based adhesives, the initial adhesion is poor, and when the wet lamination process is used, it is easy to cause too much slurry in the base cloth layer, resulting in stiff hand feeling, and the wet la

Method used

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  • Aqueous polyurethane dispersoid for synthetic leather adhesive and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061] (1) Preparation of waterborne polyurethane dispersion

[0062] Using 165.3g CMA-2085, 3.63g 1,4-butanediol, 0.45g Bis-MPA, 3.35g Ymer TM N120, 26.2g HMDI, 16.8g HDI reacts at 70-80°C. When the NCO content of the reaction was 2.73 wt%, the prepolymer was allowed to cool to 45°C and dissolved in 320 g of acetone. After mixing for 10 minutes, 2.14 g of ethylenediamine and 4.9 g of A solution of A95 in 15g deionized water. After mixing for 30 minutes, 0.34 g of triethylamine was added and stirred for 5 minutes for neutralization, 165 g of deionized water was added under a shear disperser, and acetone was then distilled off under reduced pressure to obtain a white aqueous polyurethane dispersion with a solid content of 54.71 wt %;

[0063] (2), preparation of synthetic leather adhesive

[0064] Add 0.1g of YCK1110, 0.1g of LCN407, 0.05g of Defom W-0506, 0.5g of 161. Vesmody 1g TM Mix and stir U605 to obtain 1# synthetic leather adhesive.

Embodiment 2

[0066] (1) Preparation of waterborne polyurethane dispersion

[0067] Use 200g CMA-2085, 4g 1,4-butanediol, 4.8g Bis-MPA, 2.5g Ymer TM N120, 26.2g HMDI, 30g HDI reacts at 70-80°C. When the reaction NCO content was about 3.0 wt%, the prepolymer was allowed to cool to 35°C and dissolved in 360 g of acetone. After mixing for 10 minutes, 10.8 g of isophoronediamine was added. After mixing for 20 minutes, 3.5 g of triethylamine was added and stirred for 5 minutes for neutralization, 277 g of deionized water was added under a shear disperser, and then the acetone was distilled off under reduced pressure to obtain a white aqueous polyurethane dispersion with a solid content of 50.1 wt%.

[0068] (2), preparation of synthetic leather adhesive

[0069] Add 0.1g of YCK1110, 0.1g of LCN407, 0.05g of Defom W-0506, 0.5g of 161. Vesmody 1g TM Mix and stir U605 to obtain 2# synthetic leather adhesive.

Embodiment 3

[0071] (1) Preparation of waterborne polyurethane dispersion

[0072] Use 260g CMA-2085, 6g 1,4-butanediol, 0.35g Bis-MPA, 3.35g Ymer TM N120, 32.75g HMDI, 32.75g HDI reacts at 70-80°C. When the reaction NCO content was about 2.93 wt%, the prepolymer was allowed to cool to 35°C and dissolved in 500 g of acetone. After mixing for 10 minutes, add 3.6g ethylenediamine and 8g A solution of A95 in 45g deionized water. After mixing for 30 minutes, 0.75 g of triethylamine was added and stirred for 5 minutes for neutralization, 180 g of deionized water was added under a shear disperser, and then acetone was distilled off under reduced pressure to obtain a white aqueous polyurethane dispersion with a solid content of 60 wt%.

[0073] (2), preparation of synthetic leather adhesive

[0074] Add 0.1g of YCK1110, 0.1g of LCN407, 0.05g of Defom W-0506, 0.5g of 161. Vesmody 1g TM Mix and stir U605 to obtain 3# synthetic leather adhesive.

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Abstract

The invention discloses an aqueous polyurethane dispersoid for a synthetic leather adhesive and a preparation method thereof. The aqueous polyurethane dispersoid is prepared from A, a polyurethane prepolymer prepared from 10-30wt% of polyisocyanate, 50-85wt% of polyester polyol, 0.1-3wt% of polyoxyalkylene side chain-containing dihydric alcohol, 0.1-5wt% of a low-molecular weight dihydric alcohol chain extender and 0.1-3wt% of hydroxy carboxylic acid, B, 0.1-5wt% of a polyamine chain extender a unsubstituted by an ion group, C, 0-5wt% of a chain extender b substituted by an ion group, and D, 66-100wt% of water. The aqueous polyurethane dispersoid has solid content of 50-60wt%. The synthetic leather adhesive prepared from the aqueous polyurethane dispersoid has good initial adhesion, high peel strength, excellent alkali, solvent and hydrolysis jungle test resistance, and soft handle.

Description

technical field [0001] The invention relates to a water-based polyurethane dispersion, a preparation method thereof, and an application thereof in a synthetic leather adhesive. Background of the invention [0002] my country is a big country in the manufacture of synthetic leather. At present, in the production process of the domestic polyurethane synthetic leather industry, solvent-based polyurethane resin is widely used as the basic raw material for the base layer and surface layer of traditional synthetic leather products. Most of its production processes use toluene, xylene and DMF as solvents, which have a serious impact on the ecological environment. Water-based polyurethane uses water as the medium and does not contain any solvents that can pollute the human body and the environment. Using waterborne polyurethane resin as raw material to manufacture synthetic leather is an effective way to solve the pollution in the synthetic leather industry from the source. Polyur...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/34C08G18/32C08G18/12C09J175/06C09J175/08D06N3/14
CPCC08G18/0823C08G18/0828C08G18/12C08G18/4018C08G18/6607C08G18/6625C08G18/722C08G18/73C08G18/755C08G18/758C09J175/06C09J175/08C08G18/3228C08G18/3857C08G18/3234
Inventor 张洁刘姗赵炳炎王艳丽
Owner WANHUA CHEM GRP CO LTD
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