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Waterborne polyurethane adhesive with high thermal activation temperature and preparation method thereof

A water-based polyurethane, activation temperature technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of poor high temperature resistance, low initial adhesion, etc., to improve mechanical properties, high thermal activation temperature , the effect of low organic solvent content

Inactive Publication Date: 2020-06-26
BEIJING HUATENG NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when one-component water-based polyurethane adhesives are used in industries such as shoemaking, wood processing, and automobiles, there are disadvantages such as low initial adhesion and poor high temperature resistance.

Method used

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  • Waterborne polyurethane adhesive with high thermal activation temperature and preparation method thereof
  • Waterborne polyurethane adhesive with high thermal activation temperature and preparation method thereof
  • Waterborne polyurethane adhesive with high thermal activation temperature and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046]

[0047]

[0048] The water in the last two aqueous solutions can be added to the deionized water.

[0049] Mix ethylene terephthalate-based polyester polyol and polypropylene oxide diol, and vacuum dehydrate at 120°C for 3 hours; (2) Cool down to 50°C, add HDI, IPDI, dimethylol Propionic acid and dibutyltin dilaurate were reacted at 80°C for 2.0h to obtain a polyurethane prepolymer; (3) cooling down to 40°C, adding acetone to adjust the viscosity of the system, and adding triethylamine to neutralize the reaction for 10min; (4 ) adding deionized water and aminoethanesulfonic acid sodium salt into the reaction vessel, stirring rapidly until the system is evenly dispersed, then adding ethylenediamine diluted with deionized water, and emulsifying and extending the chain for 1.0 h at a rotational speed of 1500r / min; (5) At 50°C, acetone was removed by vacuum distillation to obtain a water-based polyurethane adhesive.

[0050] Wherein, the above-mentioned ethylene terep...

Embodiment 2

[0054]

[0055] The water in the last two aqueous solutions can be added to the deionized water.

[0056] Mix diethylene glycol terephthalate-based polyester polyol and polyoxypropylene glycol, and vacuum dehydrate at 125°C for 3 hours; (2) Cool down to 50°C, add HDI, IPDI, dimethylol Propionic acid and dibutyltin dilaurate were reacted at 80°C for 2.0h to obtain a polyurethane prepolymer; (3) cooling down to 40°C, adding acetone to adjust the viscosity of the system, and adding triethylamine to neutralize the reaction for 10min; (4 ) adding deionized water and aminoethanesulfonic acid sodium salt into the reaction vessel, stirring rapidly until the system is evenly dispersed, then adding ethylenediamine diluted with deionized water, and emulsifying and extending the chain for 1.0 h at a rotational speed of 1600r / min; (5) At 50°C, acetone was removed by vacuum distillation to obtain a water-based polyurethane adhesive.

[0057] Wherein, above-mentioned diethylene glycol te...

Embodiment 3

[0061]

[0062]

[0063] The water in the last two aqueous solutions can be added to the deionized water.

[0064] Mix propylene terephthalate-based polyester polyol, polypropylene oxide diol and polytetrahydrofuran diol, and dehydrate under vacuum for 3 hours at 130°C; (2) cool down to 50°C, add HDI, IPDI, dimethylolpropionic acid and dibutyltin dilaurate were reacted at 85°C for 2.0h to obtain a polyurethane prepolymer; (3) Cool down to 40°C, add acetone to adjust the viscosity of the system, and add triethylamine and react for 10 minutes; (4) add deionized water and aminoethanesulfonate sodium salt to the reaction vessel, stir rapidly until the system is uniformly dispersed, then add ethylenediamine diluted with deionized water, and under the condition of rotating speed 1800r / min Emulsification and chain extension for 1.0 h; (5) At 50°C, acetone was removed by vacuum distillation to obtain a water-based polyurethane adhesive.

[0065] Wherein, the above-mentioned pro...

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Abstract

The invention discloses a waterborne polyurethane adhesive with high thermal activation temperature and a preparation method thereof, and belongs to the technical field of adhesives. The preparation method comprises the following steps: firstly, preparing an isocyanate-terminated polyurethane prepolymer by taking diisocyanate, polyester polyol, polyether polyol and a hydrophilic chain extender asraw materials; adding acetone to reduce viscosity, adjusting the pH value by using a neutralizer, slowly adding a proper amount of deionized water and sodium aminoethanesulfonate under high-speed shearing and stirring, slowly adding a chain extender diluted by water, and distilling off acetone under reduced pressure to obtain the waterborne polyurethane adhesive. The polyester polyol used in the method contains a chain structure of the aromatic polyester polyol prepared by recycling the waste PET packaging material, so that the production cost of the polyester polyol is reduced, and the waterborne polyurethane adhesive has relatively high thermal activation temperature, bonding strength and high-temperature resistance.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and in particular relates to a water-based polyurethane adhesive and a preparation method thereof. Background technique [0002] Polyurethane (PU) adhesives are adhesives containing carbamate groups (-NHCOO-) and / or isocyanate groups (-NCO) in the molecular chain. Polyurethane adhesive, as a medium and high-grade adhesive, has excellent flexibility, impact resistance, chemical resistance, abrasion resistance, etc., and is compatible with various substrates, such as foam, plastic, wood, leather, fabric, paper, ceramics and other porous materials , and materials with smooth surfaces such as metal, glass, rubber, plastic, etc. have excellent bonding properties. At present, polyurethane adhesives are still mainly solvent-based. For example: In domestic flexible packaging products, the usage of solvent-based polyurethane adhesives accounts for more than 80%. With the continuous deepening of peopl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C08G18/12C08G18/66C08G18/48C08G18/42C08G18/34C08G18/32C08G63/183C08G63/672
CPCC08G18/12C08G18/348C08G18/4018C08G18/4213C08G18/4808C08G18/4825C08G18/4854C08G18/6618C08G18/6625C08G63/183C08G63/672C08G2170/80C09J175/06C09J175/08C08G18/3228
Inventor 陈宇孙同兵韩航周妙兰崔正许弟张春辉
Owner BEIJING HUATENG NEW MATERIAL CO LTD
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