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Nano cellulose whisker grafted water-diluted photocuring PUV (polyurethane acrylate) resin, and preparation and application thereof

A nanocellulose, water dilution technology, applied in the field of coatings, can solve problems such as poor mechanical properties, and achieve the effects of good mechanical properties, good adhesion, good storage stability and water resistance

Active Publication Date: 2016-05-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of nano-cellulose whisker grafting water-diluted photocurable PUA resin preparation method for the poor mechanical properties of existing water-based UV photocurable polyurethane acrylate (PUA) products

Method used

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  • Nano cellulose whisker grafted water-diluted photocuring PUV (polyurethane acrylate) resin, and preparation and application thereof
  • Nano cellulose whisker grafted water-diluted photocuring PUV (polyurethane acrylate) resin, and preparation and application thereof
  • Nano cellulose whisker grafted water-diluted photocuring PUV (polyurethane acrylate) resin, and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] In this embodiment, the molar ratio of hydroxypropyl acrylate to pentaerythritol triacrylate is 2:3, and the mass of nanocellulose whiskers accounts for 0.5% of the total mass of the final obtained PUA resin solids.

[0048] (1) Synthesis of polyurethane prepolymer I: Add 28.7g of toluene-2,4-diisocyanate (TDI-80) and 27.5g of polyoxypropylene glycol (Mw =1000), drop 0.056g catalyst dibutyltin dilaurate, react in a constant temperature water bath, heat up to 85°C, keep this temperature for about 1.5h, and the NCO value of di-n-butylamine titration reaches or is slightly lower than the theoretical When the value is , the semi-blocked polyurethane prepolymer I is obtained;

[0049] (2) Synthesis of polyurethane prepolymer II: cool down to 65°C, weigh 9.3g of dimethylolpropionic acid (DMPA), dissolve it with 27.9g of acetone, place it in a dropping funnel, and drop it into a four-necked flask. The dropping rate is 3 s / drop, keep this temperature for 3 hours, add a proper ...

Embodiment 2

[0055] In this embodiment, the molar ratio of hydroxypropyl acrylate to pentaerythritol triacrylate is 2:3, and the mass of nanocellulose whiskers accounts for 2.5% of the total mass of the final obtained PUA resin solids.

[0056] (1) Synthesis of polyurethane prepolymer I: add 30.1g of toluene-2,4-diisocyanate (TDI-80) and 28.8g of polyoxypropylene glycol (Mw =1000), add dropwise 0.059g catalyst dibutyltin dilaurate, react in a constant temperature water bath, heat up to 85°C, keep this temperature for about 1.5h, and the NCO value of di-n-butylamine titration reaches or is slightly lower than the theoretical When the value is , the semi-blocked polyurethane prepolymer I is obtained;

[0057] (2) Synthesis of polyurethane prepolymer II: cool down to 65°C, weigh 9.8g of dimethylolpropionic acid (DMPA), dissolve it with 29.4g of acetone, place it in a dropping funnel, drop it into a four-necked flask, The dropping rate is 3 s / drop, keep this temperature for 3 hours, add a pro...

Embodiment 3

[0063] In this embodiment, first add nanocellulose whiskers to react with polyurethane prepolymer I, and then react with dimethylol propionic acid, wherein the molar ratio of hydroxypropyl acrylate to pentaerythritol triacrylate is 2:3, and nanocellulose The mass of whiskers accounts for 2.5% of the total mass of the final obtained PUA resin solids.

[0064] Preparation:

[0065](1) Synthesis of polyurethane prepolymer I: add 30.1g of toluene-2,4-diisocyanate (TDI-80) and 28.8g of polyoxypropylene glycol (Mw =1000), add dropwise 0.059g catalyst dibutyltin dilaurate, react in a constant temperature water bath, heat up to 85°C, keep this temperature for about 1.5h, and the NCO value of di-n-butylamine titration reaches or is slightly lower than the theoretical When the value is , the semi-blocked polyurethane prepolymer I is obtained;

[0066] (2) Graft polymerization of nanocellulose whiskers: cool down to 60°C, disperse 0.688g of self-made nanocellulose whiskers in 6.9g of a...

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Abstract

The invention belongs to the technical field of paints, and discloses a nano cellulose whisker grafted water-diluted photocuring PUV (polyurethane acrylate) resin, and preparation and application thereof. The preparation method comprises the following steps: reacting aromatic or aliphatic diisocyanate with polyoxypropylene diol to obtain a polyurethane prepolymer I, sequentially reacting the polyurethane prepolymer I with dimethylolpropionic acid, nano cellulose whiskers, 2-hydroxypropyl acrylate and a pentaerythritol triacrylate mixture to obtain a nano-cellulose-whisker-containing PUV prepolymer, neutralizing the prepolymer, diluting with water, and removing the acetone solvent to obtain the product. The nano cellulose whiskers are subjected to graft polymerization reaction with NCO and OH groups onto the polyurethane prepolymer molecular chain, so that the obtained product has very high photocuring speed, excellent adhesive force, favorable storage stability and favorable water resistance. The tensile strength of the photocured paint film can reach 15.51 MPa, and the paint film has favorable mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a water-diluted photocurable PUA resin grafted with nano-cellulose whiskers and its preparation and application. Background technique [0002] Water-based ultraviolet (UV) curing coatings combine many advantages of traditional light-curing coatings and water-based coatings, and use water instead of reactive diluents to adjust the viscosity and rheological properties of the system. It has the advantages of non-flammability, environmental friendliness, and convenient processing and operation. In the past ten years, it has gradually replaced many commonly used solvent-based coatings. However, the polyurethane acrylate synthesized under aqueous conditions, due to the introduction of DMPA hydrophilic substances, and is affected by process parameters such as reaction components, reaction temperature, stirring speed, etc., the chemical properties of its dispersion ultimatel...

Claims

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Application Information

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IPC IPC(8): C08G18/67C08G18/64C08G18/66C08G18/48C08G18/34C08G18/10
CPCC08G18/10C08G18/4018C08G18/4845C08G18/6484C08G18/672C08G18/0823C08G18/6692C08G18/6541C08G18/40C08G18/348C08G18/64
Inventor 叶代勇邓锡柱
Owner SOUTH CHINA UNIV OF TECH
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