Cellulose nanofibril composite two-component waterborne polyurethane and its preparation method and application

A water-based polyurethane and nanofibril technology, applied in cellulose adhesives, cellulose coatings, polyurea/polyurethane coatings, etc., to achieve the effects of improved mechanical properties, excellent mechanical properties, and improved storage modulus

Active Publication Date: 2018-12-21
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, it has been reported in the literature that NFC composite single-component water-based resin system is used, and the film-forming process only involves the physical film-forming process.

Method used

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  • Cellulose nanofibril composite two-component waterborne polyurethane and its preparation method and application
  • Cellulose nanofibril composite two-component waterborne polyurethane and its preparation method and application
  • Cellulose nanofibril composite two-component waterborne polyurethane and its preparation method and application

Examples

Experimental program
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Effect test

preparation example Construction

[0022] A preparation method of NFC composite two-component water-based polyurethane, in which different amounts of NFC are directly added to polyurethane polyol aqueous dispersion through cell crushing and ultrasonic oscillation method, and then polyisocyanate is mixed according to the stoichiometric ratio of hydroxyl and isocyanate groups. Combined curing to obtain NFC composite two-component waterborne polyurethane polymer. The composite polymer is used in the preparation of water-based polyurethane coatings, adhesives and polymer materials.

[0023] The range of different addition amounts of NFC is 0.01-2% of the mass of the two-component waterborne polyurethane solid resin.

[0024] The NFC is a high aspect ratio fibril with a fiber length of 400-600 μm and a fiber diameter of 10-50 nm.

[0025] The hydroxyl value of the polyurethane polyol is 50-150 mg / g, and the solid content of the polyurethane polyol aqueous dispersion is 30-50%.

[0026] In the cell smashing ultraso...

Embodiment 1

[0031] Embodiment 1: The amount of NFC added is 0.5% of the quality of two-component waterborne polyurethane solid resin

[0032] Add 0.065g of NFC to 20.00g of polyurethane polyol aqueous dispersion (solid content 35%), disperse for 10 minutes by cell crushing ultrasonic oscillation method, power is 1080W, then add 6.00g of water-based isocyanate crosslinking agent, mix well, add 6.00g After diluting with water, paint a film on a polytetrafluoroethylene board, place it at room temperature for 2 days, then bake it in an oven at 100°C for 1 hour, and measure the performance of the paint film. The tensile modulus of the composite product is 258.9MPa (25°C), the tensile strength is 11.7MPa (25°C), the storage modulus is 1693.2MPa (10°C), and the loss modulus is 112.5MPa (10°C).

Embodiment 2

[0033]Embodiment 2: NFC addition is 1% of two-component waterborne polyurethane solid resin quality

[0034] Add 0.26g of NFC to 40.00g of polyurethane polyol aqueous dispersion (solid content 35%), disperse for 10min by cell crushing ultrasonic oscillation method, power is 1260W, then add 12.00g of water-based isocyanate crosslinking agent, mix well, add 12.00g After diluting with water, paint a film on a polytetrafluoroethylene board, place it at room temperature for 2 days, then bake it in an oven at 100°C for 1 hour, and measure the performance of the paint film. The tensile modulus of the composite product is 388.2MPa (25°C), the tensile strength is 13.8MPa (25°C), the storage modulus is 1895.3MPa (10°C), and the loss modulus is 161.4MPa (10°C).

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Abstract

The invention discloses cellulose nanofibril (NFC) composite two-component waterborne polyurethanes and a preparation method and an application thereof. NFC is directly added to a polyurethane polyol aqueous dispersion body by a cell crushing ultrasonic vibration method, then the mixture is cross-linked and cured with polyisocyanate, and a series of NFC composite two-component polyurethane polymers are obtained. The composite polymers are applied in preparation of waterborne polyurethane coatings, adhesives and polymer materials. When the adding amount of the NFC is 1% of the mass of two-component waterborne polyurethane solid resin, the mechanical properties of the composite polymers are optimal; compared with those of pure two-component waterborne polyurethane cross-linked products, the tensile modulus is increased by 99.7%, the tensile strength is increased by 86.5%, the energy storage modulus is increased by 24.1%, and the loss modulus is increased by 79.9%.

Description

technical field [0001] The invention relates to a cellulose nanofibril (NFC) composite two-component waterborne polyurethane, a preparation method and application thereof. Background technique [0002] With the improvement of global environmental awareness and the improvement of environmental regulations, the emission of volatile organic compounds (VOC) in traditional solvent-based coatings has become more and more strictly restricted. Water-based coatings use water as the dispersion medium, and have the advantages of being non-flammable, non-toxic, non-polluting, and energy-saving. Two-component waterborne polyurethane coatings combine the high performance of two-component solvent-based polyurethane coatings with the low VOC content of waterborne coatings, and have become a hot spot in coating research at home and abroad. The two-component water-based polyurethane coating is composed of a water-based polyol component containing -OH groups and a low-viscosity polyisocyanate...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C08G18/79C08G18/64C08G18/12C09D175/04C09D101/02C09J175/04C09J101/02
CPCC08G18/12C08G18/6484C08G18/792C09D175/04C09J175/04C08G18/64C08L1/02
Inventor吴国民孔振武陈健刘贵锋
OwnerINST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY