Waterborne polyurethane and its preparation method and application

A technology of water-based polyurethane and hydrophilic monomers, applied in polyurea/polyurethane coatings, applications, animal husbandry, etc., can solve problems such as easy gel formation, excessive viscosity of prepolymers, and difficulty in dispersion

Active Publication Date: 2018-08-28
达威水基聚氨酯(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The second object of the present invention is to provide the preparation method of the above-mentioned water-based polyurethane, which avoids the problem that the viscosity of the prepolymer is too high when the degree of crosslinking is relatively large, and it is easy to form a gel and cause difficulty in dispersion through a simple process flow , and make the prepared water-based polyurethane have better flexibility after film formation and softer film formation

Method used

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  • Waterborne polyurethane and its preparation method and application

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preparation example Construction

[0015] Some embodiments of the present invention provide a kind of preparation method of waterborne polyurethane, it comprises the following steps:

[0016] S1. Polymerize the HDI trimer or IPDI trimer with polyethylene glycol to obtain a hydroxyl-terminated trifunctional polymer, and then combine the hydroxyl-terminated trifunctional polymer with hexamethylene diisocyanate (HDI ) or isophorone diisocyanate (IPDI) to form an isocyanate-terminated trifunctional polymer and adjust the viscosity with acetone.

[0017] S2. Reacting hexamethylene diisocyanate or isophorone diisocyanate with diol monomers and hydrophilic monomers to obtain a linear waterborne polyurethane prepolymer, and adjusting the viscosity with acetone.

[0018] S3. After carrying out the cross-linking reaction of the isocyanate-terminated trifunctional polymer with adjusted over-viscosity and the linear water-based polyurethane prepolymer with adjusted over-viscosity under the action of a chain extender, aceto...

Embodiment 1

[0059] Add IPDI trimer and polyethylene glycol with a molecular weight of 600 in a molar ratio of 1:3 into a three-necked flask, stir and heat up to 80°C for 3 hours to obtain a hydroxyl-terminated trifunctional polymer, and then add polyethylene glycol Alcohol equimolar amount of HDI, continue to react at 85°C for 3 hours to form isocyanate-terminated trifunctional polymer, cool down to 60°C and add acetone to dilute and continue to cool down to room temperature to obtain Component A. Wherein, acetone is 10% of the total mass of the reactants for forming the isocyanate-terminated trifunctional polymer.

[0060] In a 250m1 four-neck flask equipped with a stirrer, a condensing reflux tube, and a thermocouple, add IPDI, 2000 molecular weight PTMEG and DMPA and react at 90°C for 3 hours to produce a linear water-based polyurethane prepolymer, then cool down to 60°C and add acetone to reduce the temperature. Sticky, Component B is obtained. Wherein, the molar ratio of IPDI and PT...

Embodiment 2

[0063] Add the IPDI trimer and polyethylene glycol with a molecular weight of 1200 in a molar ratio of 1:3 into a three-necked flask, stir and heat up to 76°C for 2.5 hours to obtain a hydroxyl-terminated trifunctional polymer, and then add polyethylene glycol Alcohol equivalent molar amount of HDI was reacted at 90°C for 2.5 hours to form an isocyanate-terminated trifunctional polymer. Cool down to 60°C and add acetone to dilute and continue to cool down to room temperature to obtain Component A. Wherein, acetone accounts for 20% of the total mass of the reactants for forming the isocyanate-terminated trifunctional polymer.

[0064] Add HDI, 2000 molecular weight PCL and DMPA to a 250m1 four-neck flask equipped with a stirrer, condensing reflux tube, and thermocouple, and react at 90°C for 3 hours to produce a linear water-based polyurethane prepolymer, then cool down to 60°C and add acetone to reduce the temperature. Sticky, Component B is obtained. Wherein, the molar ratio...

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Abstract

The invention relates to the field of macromolecular materials and particularly relates to waterborne polyurethane and a preparation method and application thereof. The preparation method comprises the steps: subjecting an HDI trimer or IPDI trimer to a polymerization reaction with polyethylene glycol, then, subjecting the product to a reaction with hexamethylene diisocyanate or isophorone diisocyanate so as to form an isocyanate terminated tri-functionality polymer, and regulating the viscosity of the isocyanate terminated tri-functionality polymer with acetone; subjecting HDI or IPDI to a reaction with a binary alcoholic monomer and a hydrophilic monomer so as to obtain a linear aqueous polyurethane prepolymer, and regulating the viscosity of the linear aqueous polyurethane prepolymer with acetone; subjecting the isocyanate terminated tri-functionality polymer and the linear aqueous polyurethane prepolymer to a cross-linking reaction under the action of a chain extender, and removingthe acetone, thereby obtaining the waterborne polyurethane. After the waterborne polyurethane prepared by the preparation method forms a film, the softness is relatively good, finished, compliant andsoft surface touch feeling of leather is achieved, and meanwhile, the physical properties are relatively good.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a water-based polyurethane and its preparation method and application. Background technique [0002] Water-based polyurethane is a new type of polyurethane system that uses water instead of organic solvents as the dispersion medium, also known as water-dispersed polyurethane, water-based polyurethane or water-based polyurethane. Water-based polyurethane uses water as a solvent, and has the advantages of no pollution, safety and reliability, excellent mechanical properties, good compatibility, and easy modification. Water-based polyurethane leather brightener is used as the top layer of leather, and it needs to have good physical properties. In order to improve its physical properties (water resistance, solvent resistance, abrasion resistance, dry and wet wipe resistance, etc.), it is usually necessary to introduce multifunctional groups during the polymerization of waterborne po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/79C08G18/73C08G18/75C08G18/66C08G18/48C08G18/42C08G18/44C08G18/32C08G18/34C08G18/12C09D175/04C09D175/06C09D175/08C14C11/00
CPCC08G18/0823C08G18/12C08G18/4277C08G18/44C08G18/4825C08G18/4833C08G18/4854C08G18/6659C08G18/6692C08G18/73C08G18/755C08G18/792C09D175/04C09D175/06C09D175/08C14C11/006C08G18/3228
Inventor 徐家宽赵旭忠李梅芳
Owner 达威水基聚氨酯(上海)有限公司
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