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Aliphatic water-based polyurethane dispersion and water-based dry adhesive for synthetic leather including it

A water-based polyurethane, aliphatic technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of difficult to uniformly bake out moisture, thick base, airtight and other problems

Active Publication Date: 2021-04-20
WANHUA CHEMICAL (NINGBO) CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the actual production process, whether it is pasting cloth or base on release paper, there are many problems in the existing water-based polyurethane laminating adhesive, especially for shoe leather, the base is very thick, airtight, wet or semi-dry. The glue will cause many problems such as bubbling, poor bonding, and slow speed. The main reason is that the bonding glue is between the release paper and the base, and it is difficult to evenly dry off the moisture.
[0006] Chinese patent CN 201510474573.2 introduces a water-based polyurethane resin, which is a laminating material used in the garment leather semi-dry lamination process. In the synthesis process, the hydroxyl group is excessive and is directly blocked with hydroxyl groups; the water-based polyurethane resin is used for clothing leather lamination , heated to a semi-dry state for veneering, the pasted leather feels extremely soft and has high peel strength; this patent uses the method of excess hydroxyl, which is only suitable for the semi-dry lamination process of garment leather

Method used

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  • Aliphatic water-based polyurethane dispersion and water-based dry adhesive for synthetic leather including it
  • Aliphatic water-based polyurethane dispersion and water-based dry adhesive for synthetic leather including it
  • Aliphatic water-based polyurethane dispersion and water-based dry adhesive for synthetic leather including it

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Experimental program
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Effect test

Embodiment 1

[0034] The synthetic leather water-based dry adhesive is prepared from the following raw materials in parts by weight (1 part by weight is 1 gram):

[0035]

[0036] In the present embodiment, the preparation method of the aliphatic aqueous polyurethane dispersion A is as follows: 200g of tetrahydrofuran-propylene glycol copolymerized glycol (number average molecular weight 2000), 15g of HMDI, 50g of acetone, 20g of dimethylolpropionic acid, 2g of Add diethylene glycol and 0.4g organic bismuth 2811 into a 1L four-neck round bottom flask equipped with a nitrogen inlet and outlet, and stir the mixture at 60-80°C for 3.5h (reaction) until the NCO% reaches 2%. Add 150g of acetone to dilute and cool down to 35°C, then add 15g of AMP95, 7.5g of N-(2-hydroxyethyl)ethylenediamine and 7.5g of ethylenediamine for chain extension reaction, then add 15.1g of triethylamine Neutralize for about 5 min, then add 400 g of water to high shear disperse the mixture for 15 min. After the aceto...

Embodiment 2

[0040] The synthetic leather water-based dry adhesive is prepared from the following raw materials in parts by weight (1 part by weight is 1 gram):

[0041]

[0042] In the present embodiment, the preparation method of aliphatic water-based polyurethane dispersion B is as follows: 200g polytetrahydrofuran diol (number average molecular weight 2000), 20gIPDI, 40g acetone, 30g dimethylolpropionic acid, 3g neopentyl Diol and 0.3 g of organic bismuth 2808 were added to a 1 L four-neck round bottom flask equipped with a nitrogen inlet and outlet, and the mixture was stirred at 60-80° C. for 4 h until the NCO% reached 2%. Add 100g of acetone to dilute and cool down to 35°C, then add 20g of AMP95, 25g of N-(2-hydroxyethyl)ethylenediamine and 5g of ethylenediamine for chain extension reaction, then add 30g of triethylamine for neutralization for about 5min , and then add 350 g of water to high shear disperse the mixture for 15 min. After the acetone was separated by distillation, ...

Embodiment 3

[0046] The synthetic leather water-based dry adhesive is prepared from the following raw materials in parts by weight (1 part by weight is 1 gram):

[0047]

[0048] In the present embodiment, the preparation method of the aliphatic aqueous polyurethane dispersion C is as follows: 100 g of dehydrated polypropylene glycol diol (number average molecular weight 1000), 10 g of HDI, 30 g of acetone, 10 g of dimethylol propionic acid, and 1 g of acetone Diethylene glycol and 0.4g organic bismuth 2010 were added into a 1L four-neck round-bottomed flask equipped with a nitrogen inlet and outlet, and the mixture was stirred at 60-80°C for 5h until the NCO% reached 2.3%. Add 80g of acetone to dilute and cool down to 35°C, then add 10g of AMP95, 10g of N-(2-hydroxyethyl)ethylenediamine and 5g of ethylenediamine for chain extension reaction, then add 10g of triethylamine for neutralization for about 5min , and then add 200 g of water to high shear disperse the mixture for 15 min. Afte...

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Abstract

The invention discloses an aliphatic water-based polyurethane dispersion, a water-based polyurethane laminating adhesive for synthetic leather comprising the same and a preparation method thereof. The aliphatic water-based polyurethane dispersion is prepared by the following steps: adding the reactant polyol, aliphatic isocyanate, compound containing hydrophilic group, small molecule diol, and the first part of organic solvent into the reaction kettle and raising the temperature to 60-95°C, React for 1-10h, add the second part of organic solvent, dilute and cool down, add post-chain extender and post-capping agent, carry out chain extension reaction, add neutralizing agent to neutralize, then add water for high-speed shear dispersion, and obtain organic Aqueous polyurethane dispersion of solvent, aliphatic aqueous polyurethane dispersion obtained by distilling off the organic solvent.

Description

technical field [0001] The invention relates to the field of water-based polyurethane resins, in particular to an aliphatic water-based polyurethane dispersion and a water-based polyurethane laminating adhesive for synthetic leather comprising the dispersion and a preparation method thereof. Background technique [0002] Synthetic leather is artificial leather, which imitates real leather in terms of structure, feel and style, but its output is much larger than that of real leather. The production process is stable, the production efficiency is high, and the product has good wear resistance and durability. It is widely used in shoe leather and garment leather. , luggage leather, sofa leather, ball leather, furniture decoration leather and other fields; the annual output of synthetic leather is about 3 billion meters, and more than 3 million tons of polyurethane resin are used. At present, solvent-based polyurethane resin is still used, and solvent-based polyurethane resin is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/34C08G18/32C09J175/08
CPCC08G18/3206C08G18/3228C08G18/3271C08G18/348C08G18/4854C08G18/6692C09J175/08
Inventor 赵炳炎邓俊英张树翔耿丹丹孙家宽
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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