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A kind of water-based polyurethane acrylate emulsion with re-emulsifiability and preparation method thereof

A polyurethane acrylate and acrylate technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as not easy to clean, easy to stick to construction tools, and increase costs

Active Publication Date: 2021-04-20
WANHUA CHEMICAL (NINGBO) CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similar to the drying and film-forming process of ordinary water-based polyurethane resins, the molecular chains in the emulsion particles permeate and diffuse with each other during the drying and film-forming process of this water-based photocurable polyurethane acrylate resin before being irradiated with ultraviolet light, and gradually intertwine with each other. , when the coating film encounters water again, it cannot be dispersed into water again to become an emulsion, so it is easy to adhere to the construction tools during the construction process, it is not easy to clean, it is difficult to realize recycling, and the cost is increased

Method used

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  • A kind of water-based polyurethane acrylate emulsion with re-emulsifiability and preparation method thereof
  • A kind of water-based polyurethane acrylate emulsion with re-emulsifiability and preparation method thereof
  • A kind of water-based polyurethane acrylate emulsion with re-emulsifiability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Add 280 grams of H 12MDI, 124.7 grams of PNA600, 128.4 grams of non-ionic hydrophilic compound C1, 32.8 grams of DMPA and 32.8g NEP, added 300ppm dibutyltin dilaurate catalyst, reacted at 80°C for 2 hours, and measured the prepolymerization by n-butylamine titration The NCO content of the product is 6.1%. Add 222 grams of tertiary carbonic acid glycidyl acrylate and react at 85°C for 6 hours. The remaining NCO content is 0.14%. Add 230 grams of acetone, reduce the resin temperature to 30°C, Sodium hydroxide is made into a 20wt% aqueous solution and added to the resin for neutralization. After 5 minutes of neutralization, 1150 grams of water are added for emulsification. The acetone is removed from the emulsion in a vacuum to obtain a translucent milky white emulsion with a solid content of about 40%.

Embodiment 2

[0065] Add 280 grams of H 12 MDI, 180.8 grams of PNA600, 196 grams of non-ionic hydrophilic compound C2, added 350 ppm dibutyltin dilaurate catalyst, and reacted at 75 ° C for 1.5 hours. The NCO content of the prepolymer measured by n-butylamine titration is 7.3%. Add 120 grams of pentaerythritol triacrylate and react at 85°C for 5.5 hours. The remaining NCO content is 0.6%. Reduce the resin temperature to 30°C and add 1200 grams of water were emulsified, and the acetone was removed from the emulsion in vacuum to obtain a translucent emulsion with a solid content of about 40%.

Embodiment 3

[0067] Add 328 grams of H 12 MDI, 180.8 grams of PTMEG1000, 32 grams of non-ionic hydrophilic compound C2, 32 grams of DMPA and 32 g of NEP, added 300 ppm dibutyltin dilaurate catalyst, and reacted at 80 ° C for 2 hours. The NCO content of the prepolymer was measured to be 5.4% by n-butylamine titration, and 104 grams of isooctyl glycidyl ether acrylate was added, reacted at 85°C for 65 hours, and the remaining NCO content was measured to be 0.35%; trimethylol was added Add 20 grams of propane triacrylate, add 230 grams of acetone, lower the resin temperature to 35°C, add 27.2 grams of TEA for neutralization, and then continue to add 1200 grams of water for emulsification after 5 minutes of neutralization, and vacuum remove the acetone from the emulsion to obtain the solid content About 38.5% translucent milky white emulsion.

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Abstract

The invention relates to a water-based polyurethane acrylate emulsion with re-emulsifiability and a preparation method thereof. The solid content of the emulsion contains 30-100 wt% of unsaturated water-based polyurethane acrylate and 0-70 wt% of at least two (a base) acrylate compounds with acrylate functional groups. Wherein the unsaturated water-based polyurethane acrylate is composed of 20-50wt% polyisocyanate, 5-30wt% polymerized glycol, 1-20wt% non-ionic hydrophilic compound, 0-10wt% ionic hydrophilic compound and 5-40wt% monohydroxy acrylic acid The ester compound is obtained by reaction, and is calculated by weight of unsaturated water-based polyurethane acrylate. The emulsion can be rapidly re-emulsified when it meets water after drying and before being irradiated with UV light for curing, and is convenient for washing from substrates or construction tools, and can be widely used in fields such as woodware, flooring, plastics, and printing inks.

Description

technical field [0001] The invention relates to a water-based polyurethane acrylate emulsion and a preparation method thereof, in particular to a re-emulsifiable water-based polyurethane acrylate emulsion and a preparation method thereof. Background technique [0002] The water-based polyurethane acrylate resin cured by ultraviolet light uses water as the dispersion medium, and the polyurethane acrylate component is evenly dispersed in the water in the form of particles with a particle size of tens to hundreds of nanometers. The UV-cured water-based polyurethane acrylate resin is coated on the substrate, and as the water volatilizes, the particles approach each other to achieve a dense filling state. In the densely packed state, the particles are in contact with each other, the particles are deformed, and the molecular chains between the particles permeate and diffuse to form a film. When ultraviolet light irradiates the coating film, the photoinitiator in it is excited to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/07C08G18/67C08G18/48C08G18/42C08G18/66C08G18/34C09D175/14C08L75/14
CPCC08G18/348C08G18/4018C08G18/4238C08G18/48C08G18/6625C08G18/6692C08G18/67C08G18/673C08J3/07C08J2375/14C09D175/14C08G18/40
Inventor 孙永建赵伟国王洪武
Owner WANHUA CHEMICAL (NINGBO) CO LTD