Cellulose nano-whisker (CNW) compounded bi-component terpenyl waterborne polyurethane and preparation method and use thereof

Abstract

The invention discloses cellulose nano-whisker (CNW) compounded bi-component terpenyl waterborne polyurethane and a preparation method and use thereof. According to the preparation method, a CNW aqueous suspension is directly added into a terpenyl polyol aqueous dispersion by stirring and ultrasonic vibration methods and then is crosslinked with polyisocyanate, thereby obtaining a CNW compounded bi-component waterborne polyurethane system. The compounded system is applied to the preparation of waterborne polyurethane coatings, adhesives and polymer materials. The preparation method of the compounded system is simple and convenient, and CNWs can be uniformly and steadily dispersed into the polyol aqueous dispersion without surface modification and drying. Active hydroxyl of the surfaces of the CNWs is subjected to chemical and physical compounding with thermosetting matrix resin, so that the interaction between the CNWs and resin matrix interfaces is enhanced, and the properties of composite materials can be effectively improved.

Description

technical field

[0001] The invention relates to a cellulose nano-whisker (CNW) composite two-component waterborne terpene-based polyurethane, a preparation method and application thereof. Background technique

[0002] With the improvement of global environmental protection 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 l...

Examples

Embodiment 1

[0029] Example 1: The amount of CNW added is 0.5% of the quality of the two-component terpene-based waterborne polyurethane solid resin

[0030] Add 1.65g of CNW aqueous suspension (mass percentage concentration 3%) to 15.00g terpene-based epoxy resin polyol aqueous dispersion (solid content 35%wt), stir evenly, then add 5.85g water-based isocyanate crosslinking agent, Mix evenly, add 7.12g of water to dilute, then paint film on polytetrafluoroethylene board, leave it at room temperature for 2 days, then bake in 100°C oven for 1 hour, and measure the performance of the paint film. The tensile modulus of the composite product is 20.26MPa, the tensile strength is 13.12MPa, the storage modulus is 1.36MPa (150°C), and the loss modulus is 34.12KPa (150°C).

Embodiment 2

[0031] Embodiment 2: The amount of CNW added is 1% of the quality of the two-component terpene-based waterborne polyurethane solid resin

[0032] Add 1.77g of CNW aqueous suspension (mass percentage concentration 3%) to 8.00g terpene-based epoxy resin polyol aqueous dispersion (solid content 35wt%), ultrasonic 20min, then add 3.12g water-based isocyanate crosslinking agent, mix Evenly, after adding 2.92g of water to dilute, coat the 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 composite product has a tensile modulus of 25.55MPa, a tensile strength of 13.77MPa, a storage modulus of 1.57MPa (150°C), and a loss modulus of 42.57KPa (150°C).

Embodiment 3

[0033]Embodiment 3: The amount of CNW added is 2% of the quality of the two-component terpene-based waterborne polyurethane solid resin

[0034] Add 3.53g of CNW water suspension (mass percentage concentration 3%) to 8.00g terpene-based epoxy resin polyol aqueous dispersion (solid content 35wt%), stir evenly, then add 3.12g water-based isocyanate crosslinking agent, mix Evenly, after adding 1.15g of water to dilute, coat the film in a polytetrafluoroethylene template, 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 34.33MPa, the tensile strength is 14.95MPa, the storage modulus is 2.38MPa (150°C), and the loss modulus is 75.13KPa (150°C).

technical field

[0001] The invention relates to a cellulose nano-whisker (CNW) composite two-component waterborne terpene-based polyurethane, a preparation method and application thereof. Background technique

[0002] With the improvement of global environmental protection 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 l...

Examples

Embodiment 1

[0029] Example 1: The amount of CNW added is 0.5% of the quality of the two-component terpene-based waterborne polyurethane solid resin

[0030] Add 1.65g of CNW aqueous suspension (mass percentage concentration 3%) to 15.00g terpene-based epoxy resin polyol aqueous dispersion (solid content 35%wt), stir evenly, then add 5.85g water-based isocyanate crosslinking agent, Mix evenly, add 7.12g of water to dilute, then paint film on polytetrafluoroethylene board, leave it at room temperature for 2 days, then bake in 100°C oven for 1 hour, and measure the performance of the paint film. The tensile modulus of the composite product is 20.26MPa, the tensile strength is 13.12MPa, the storage modulus is 1.36MPa (150°C), and the loss modulus is 34.12KPa (150°C).

Embodiment 2

[0031] Embodiment 2: The amount of CNW added is 1% of the quality of the two-component terpene-based waterborne polyurethane solid resin

[0032] Add 1.77g of CNW aqueous suspension (mass percentage concentration 3%) to 8.00g terpene-based epoxy resin polyol aqueous dispersion (solid content 35wt%), ultrasonic 20min, then add 3.12g water-based isocyanate crosslinking agent, mix Evenly, after adding 2.92g of water to dilute, coat the 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 composite product has a tensile modulus of 25.55MPa, a tensile strength of 13.77MPa, a storage modulus of 1.57MPa (150°C), and a loss modulus of 42.57KPa (150°C).

Embodiment 3

[0033]Embodiment 3: The amount of CNW added is 2% of the quality of the two-component terpene-based waterborne polyurethane solid resin

[0034] Add 3.53g of CNW water suspension (mass percentage concentration 3%) to 8.00g terpene-based epoxy resin polyol aqueous dispersion (solid content 35wt%), stir evenly, then add 3.12g water-based isocyanate crosslinking agent, mix Evenly, after adding 1.15g of water to dilute, coat the film in a polytetrafluoroethylene template, 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 34.33MPa, the tensile strength is 14.95MPa, the storage modulus is 2.38MPa (150°C), and the loss modulus is 75.13KPa (150°C).

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