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A kind of hydrolysis-resistant cationic waterborne polyurethane adhesive and preparation method thereof

A water-based polyurethane, cationic technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of ordinary water-based polyurethanes that do not meet the requirements and poor adhesion, and achieve excellent hydrolysis resistance. , improve dispersion, enhance the effect of controllability

Active Publication Date: 2021-07-09
HEFEI ANLI POLYURETHANE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-based polyurethane adhesive layer resin can improve the environmental protection performance of synthetic leather, but the bonding force between it and the base fabric interface is poor, and the performance of ordinary water-based polyurethane cannot meet the requirements

Method used

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  • A kind of hydrolysis-resistant cationic waterborne polyurethane adhesive and preparation method thereof
  • A kind of hydrolysis-resistant cationic waterborne polyurethane adhesive and preparation method thereof
  • A kind of hydrolysis-resistant cationic waterborne polyurethane adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A hydrolysis-resistant cationic water-based polyurethane adhesive, consisting of the following components by mass (g):

[0030] HMDI 100 SP-2000 50 PTMG-2 100 EG 4 MDEA 19 Solvent acetone 19 acetic acid 8.6 Deionized water 320 Amino-terminated polyether 2000 33 capping agent methanol 5.8

[0031] The preparation method of described hydrolysis-resistant cationic waterborne polyurethane adhesive is as follows:

[0032] Put HMDI, SP-2000, and PTMG-2 into the reaction kettle and control the reaction temperature at 85°C. After the reaction until the NCO content reaches 10.3% of the theoretical amount, cool down to 50°C and add small molecule chain extender EG to react for 3 hours, then add MDEA to continue After reacting for 1 hour, a low-molecular-weight water-based polyurethane prepolymer was obtained. During the reaction, a solvent was added to control the viscosity to be stable. After cooling, acetic aci...

Embodiment 2

[0034] A hydrolysis-resistant cationic water-based polyurethane adhesive, consisting of the following components by mass (g):

[0035]

[0036]

[0037] The preparation method of described hydrolysis-resistant cationic waterborne polyurethane adhesive is as follows:

[0038] Put HMDI, SP-2000, and PPG-2 into the reaction kettle and control the reaction temperature at 85°C. After the reaction until the NCO content reaches 9.5% of the theoretical amount, cool down to 50°C and add small molecule chain extender 1,4-butanediol to react 3 hour, then add MDEA and continue to react for 1 hour to obtain a low molecular weight water-based polyurethane prepolymer. During the reaction, a solvent is added in good time to control the viscosity. After cooling, acetic acid is added to neutralize the pH value to 7-8, and deionized water is slowly added to the In the material system, the material is emulsified in water. After the emulsification is completed, the amino-terminated polyether...

Embodiment 3

[0040] A hydrolysis-resistant cationic water-based polyurethane adhesive, consisting of the following components by mass (g):

[0041] HMDI 120 SP-2000 80 PPG-2 80 1,3-Butanediol 3.5 MDEA 28 Solvent acetone 20 acetic acid 12.7 Deionized water 443 Polyaminopolyether 1000 34 capping agent ethanol 4.6

[0042] The preparation method of described hydrolysis-resistant cationic waterborne polyurethane adhesive is as follows:

[0043] Put HMDI, SP-2000, and PPG-2 into the reaction kettle and control the reaction temperature at 90°C. After the reaction until the NCO content reaches 11.3% of the theoretical amount, cool down to 40°C and add small molecule chain extender 1,3-butanediol to react 2 hour, then add MDEA and continue to react for 1 hour to obtain a low molecular weight water-based polyurethane prepolymer. During the reaction, a solvent is added in good time to control the viscosity. After cooling, acetic aci...

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Abstract

The invention discloses a hydrolysis-resistant cationic water-based polyurethane adhesive and a preparation method thereof. It consists of the following components in mass ratio: HMDI 14.9-17.6%, long-chain polyol 19.8-27%, and hydrophilic chain extender 3-4 %, small molecule chain extender 0.4‑0.6%, neutralizer 1.3‑1.8%, long-chain aliphatic diamine 3.1‑5.1%, end-capping agent 0.6‑1.0%, solvent 2.5‑4%, deionized water 45% -55%. The preparation method is to synthesize low-molecular-weight water-based polyurethane prepolymers from HMDI, long-chain polyols, hydrophilic chain extenders, and small-molecule chain extenders. The diamine is subjected to secondary chain extension, and after capping, a hydrolysis-resistant cationic waterborne polyurethane resin with high solid content, excellent adhesive performance, and storage stability is obtained. The water-based polyurethane has excellent hydrolysis resistance and yellowing resistance, high solid content, easy drying, strong adhesion, and can improve the binding force between interfaces.

Description

technical field [0001] The invention relates to the field of polyurethane preparation, in particular to a hydrolysis-resistant cationic waterborne polyurethane adhesive and a preparation method thereof. Background technique [0002] Polyurethane synthetic leather is made of polyurethane coating on a specific cloth base. It has soft and natural luster, soft touch, and a strong leather-like appearance. It has excellent adhesion to the substrate, abrasion resistance, flex resistance, and aging resistance. It is the most ideal substitute for natural leather and is widely used in clothing, shoemaking, luggage, furniture and other industries. [0003] The polyurethane used for synthetic leather is generally a solvent-based resin with a large molecular weight and excellent film-forming properties, but the residual solvent is harmful to health, and the control requirements are becoming more and more stringent. The water-based polyurethane adhesive layer resin can improve the enviro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/50C08G18/48C08G18/42C08G18/32C08G18/12C09J175/06C09J175/08
CPCC08G18/12C08G18/4238C08G18/4825C08G18/4854C08G18/5024C08G18/758C09J175/06C09J175/08C08G18/3206C08G18/3275C08G18/50
Inventor 姚克俭张彪武春余葛礼响季明洋王中睿李李
Owner HEFEI ANLI POLYURETHANE NEW MATERIAL
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