Method for preparing aqueous polyurethane adhesive and superfine fiber synthetic leather

A technology of water-based polyurethane and hydrophilic polyurethane, which is applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve problems such as poor adhesion of adhesives, and achieve improved peel strength and improved Mechanical properties, cost reduction effect

Active Publication Date: 2010-03-10
HUADA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the adhesive bonding effect is not good in the semi-dry pasting process of the superfine fiber base cloth existing in the above-mentioned prior art, and to provide a high Solid content water-based polyurethane adhesive, the adhesive has good initial tack, tensile strength, elongation at break, resilience and high final bond strength, and is energy-saving and environmentally friendly. Preparation method of superfine fiber synthetic leather

Method used

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  • Method for preparing aqueous polyurethane adhesive and superfine fiber synthetic leather

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The specific technological process of the preparation method of the aqueous polyurethane adhesive of the present embodiment and the superfine fiber synthetic leather is as follows:

[0043] 1. Synthesis of hydrophilic polyurethane prepolymer

[0044] Put 42.2g of toluene diisocyanate (T-80 / 20), 48.6g of diphenylmethane 4,4-diisocyanate, Polyhexamethylene adipate diethylene glycol acetal diol 132g, polyethylene adipate butylene glycol ester diol 132g, polyethylene adipate terephthalate diol 88g, hydrophilic Water-based chain extender (this hydrophilic group is used in all formulations) 22.7g of dimethylolpropionic acid, stir well, react at a temperature of 80-90°C for 3 hours, then add 3.1g of small molecule chain extender ethylene glycol At the same time, 2.6g of triethylenediamine, an amine-based environment-friendly catalyst, was added to the alcohol, and then kept at 60°C for 3 hours to form a hydrophilic polyurethane prepolymer.

[0045] 2. Preparation of water-ba...

Embodiment 2

[0052] The preparation method technological process of the aqueous polyurethane adhesive of the present embodiment and superfine fiber synthetic leather:

[0053] 1. Synthesis of hydrophilic polyurethane prepolymer

[0054] Put 48.5g of toluene diisocyanate (T-80 / 20), 30.6g of diphenylmethane 4,4-diisocyanate into a four-neck round bottom flask equipped with strong mechanical stirring, nitrogen, temperature controller, and condensation reflux equipment. Polyhexamethylene adipate diol 120g, polybutylene adipate terephthalate diol polyester polyol 130g, neopentyl glycol butylene adipate phthalate diol 80g, 23g of dimethylolpropionic acid, heat up to 81°C for 3.2h, add 5.6g of diethylene glycol, and add 2.5g of amine-based environment-friendly catalyst triethylamine at the same time, then heat at 62°C for 3.3h to form a hydrophilic polyurethane prepolymer.

[0055] 2. Preparation of water-based polyurethane emulsion

[0056] After the prepolymer is cooled to 10-40°C, triethyla...

Embodiment 3

[0062] The preparation method technological process of the aqueous polyurethane adhesive of the present embodiment and superfine fiber synthetic leather:

[0063] 1. Synthesis of hydrophilic polyurethane prepolymer

[0064] Put 57.8g of toluene diisocyanate (T-80 / 20), 36.5g of diphenylmethane 4,4-diisocyanate, Polyhexamethylene adipate diol polyester polyol 144g, polybutylene adipate succinate diol polyester polyol 192g, dimethylol propionic acid 22.7g, heat up to 84°C and keep the temperature at 3.5 h, add 4.5g of 1,4-butanediol and at the same time add 2.5g of triethylamine, an environmental-friendly amine catalyst, and keep it warm at 64°C for 3.6h to form a hydrophilic polyurethane prepolymer.

[0065] 2. Preparation of water-based polyurethane emulsion

[0066] Cool the prepolymer to 18° C., add metered triethylamine, neutralize and emulsify in water to obtain a water-based polyurethane emulsion with a solid content of 47%.

[0067] 3. Preparation of water-based polyur...

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Abstract

The invention relates to a method for preparing an aqueous polyurethane adhesive and superfine fiber synthetic leather, which belongs to the technical field of chemical products and preparation methods thereof. The method is characterized by comprising the following steps: mixing polyester polyol, isocyanate, a hydrophilic chain extending agent, a micromolecule chain extending agent and an amine environment friendly catalyst to obtain a hydrophilic aqueous polyurethane prepolymer; adding a neutralizing agent to the aqueous polyurethane prepolymer to obtain an aqueous polyurethane latex; then adding an amine chain expanding agent, a thickening agent, a defoaming agent and a flatting agent to the aqueous polyurethane latex to obtain the aqueous polyurethane adhesive; coating the aqueous polyurethane latex on release paper; drying the release paper; then coating the aqueous polyurethane adhesive on the dried release paper; and pressing the release paper and base cloth together to obtain the superfine fiber synthetic leather. The high solid content aqueous polyurethane adhesive prepared by the method has better initial tack and rebound resilience and higher final strength, and the prepared superfine fiber synthetic leather has higher peel strength and low-temperature folding endurance. The preparing process of the method greatly reduces the use and the discharge of organic solvents, reduces the energy consumption and furthest reduce the environmental pollution.

Description

technical field [0001] The invention relates to a preparation method of a water-based polyurethane adhesive, and a method for preparing a superfine fiber synthetic leather by laminating the water-based polyurethane adhesive with a release paper and a superfine fiber base cloth, belonging to chemical products and a preparation method thereof Structural technology field. technical background [0002] At present, my country has become a big country in the manufacture of synthetic leather. Solvent-based polyurethane resin, as the basic raw material for the base layer and surface layer of traditional synthetic leather products, has an annual demand of more than 1.1 million tons. Most of its production process uses toluene, xylene and DMF as solvents. Although 85% of the solvents in the wet process are recycled, about 15% of the solvents in the wet process and about 50% in the dry process cannot be recovered, which not only causes a lot of waste of organic solvents, but also ine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06D06N3/14B32B27/12
Inventor 刘少勇訾少宝李伟
Owner HUADA CHEM GRP CO LTD
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