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Sealed UV curable aqueous polyurethane resin and preparation method thereof

A technology of waterborne polyurethane and ultraviolet light, which is applied in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, adhesive types, etc. Large shrinkage and other problems, to achieve the effect of improving the degree of curing and adhesion, high hardness after curing, and good storage stability

Inactive Publication Date: 2009-03-11
UNIV OF SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited penetration depth of ultraviolet light, when this UV-curable water-based polyurethane resin is applied to thicker coatings or three-dimensional parts, there are often incomplete curing or Difficult curing problem; in addition, UV curing is a free radical polymerization mechanism, and the volume shrinkage after polymerization is relatively large, which will also affect the adhesion of the coating to the substrate

Method used

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  • Sealed UV curable aqueous polyurethane resin and preparation method thereof
  • Sealed UV curable aqueous polyurethane resin and preparation method thereof
  • Sealed UV curable aqueous polyurethane resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put 36.7 grams of PTMG in a 500ml three-necked flask, after dehydration at 100°C for 1.5 hours, add 47.9 grams of IPDI, stir and react at 100°C for 2 hours, then add 6.5 grams of hydrophilic chain extender DA, and stir at 90°C After reacting for 2 hours, add 22 grams of acetone, 45 grams of DPETA, 2.8 grams of p-methoxyphenol and 0.073 grams of dibutyltin dilaurate. After stirring at 80°C for 2 hours, add 4.5 grams of DAM and stir at 65°C. After 1.5 hours of reaction, transfer the reaction product to a high-speed shearing disperser, add 5 grams of triethylamine at 800 rpm and 40°C, react for 1 minute, then add 272 grams of water, and the UV can be obtained after 5 minutes Light-curable water-based polyurethane resin emulsion; transferred to a rotary evaporator, and acetone was removed under vacuum conditions of 40°C and 0.08MPa to obtain a closed UV-curable water-based polyurethane resin.

Embodiment 2

[0018] Put 35.8 grams of PJ in a 500ml three-necked flask, after dehydration treatment at 110°C for 1 hour, add 75.5 grams of MDI, stir and react at 80°C for 4 hours, then add 12.3 grams of hydrophilic chain extender DA, and stir at 60°C After reacting for 4 hours, add 55 g of butanone, 36.6 g of PEDA, 0.09 g of hydroquinone and 0.018 g of dibutyltin dilaurate. After stirring at 50°C for 4 hours, add 8.9 g of DMPM and stir at 50°C. After 3 hours, transfer the reaction product to a high-speed shearing disperser, add 9.5 g of triethylamine at 2000 rpm and 30°C, react for 2 minutes, then add 418 g of water, and get UV light after 1 minute Curing the water-based polyurethane resin emulsion; transfer it to a rotary evaporator, and remove butanone under vacuum conditions of 50°C and 0.08MPa to obtain a closed UV-curable water-based polyurethane resin.

Embodiment 3

[0020] Place 95 kg of PCD and HTTP mixture in any ratio in a 50L reactor. After dehydration treatment at 120°C for 0.5 hours, 64.8 kg of TDI is added. After reacting at 90°C for 3 hours, 8 kg of hydrophilic chain extension are added. Reagent DA, after reacting at 80°C for 1 hour, add 58.5 kg of acetone, 31.1 kg of TPMMA, 3 kg of BHT and 0.069 kg of dibutyltin dilaurate, stir and react at 65°C for 3 hours, then add 6.3 kg of PN After stirring and reacting at 60℃ for 2.5 hours, the reaction product was transferred to a high-speed shearing disperser, 6.5 kg of triethylamine was added at 4000 rpm and 20℃, and reacted for 3 minutes, and then 342 kg of water was added for 3 minutes Afterwards, the UV-curable waterborne polyurethane resin emulsion is obtained; the emulsion is transferred to a desolventizing kettle, and the acetone is removed under vacuum conditions of 60°C and 0.08MPa to obtain a closed UV-curable waterborne polyurethane resin.

[0021] If other conditions in this embodi...

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PUM

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Abstract

The invention discloses closed type ultraviolet light solidifying waterborne polyurethane resin and a method for preparing the same. The polyurethane resin and the method are characterized in that the double bond of acrylic ester is introduced to the side chain of the polyurethane by utilizing a chain extender mode, and an end NCO group is sealed and protected by a sealer; and the side chain of a molecular chain of the obtained product has the double bond of an acrylic ester group, wherein the double bond is capable of ultraviolet light solidifying, and the end of a molecular main chain of the product has an unsealable sealer group. The polyurethane resin has the advantages of good storage stability and high hardness after solidification, and further improves the solidifying degree and the adhesive force of a solidifying film and is applied to the coating of workpiece shadow areas, thicker coatings and three-dimensional parts which are hard to penetrate by ultraviolet light. Because the resin coating film is subjected to triple solidification of natural drying solidification, ultraviolet solidification and unsealing-hot solidification, the resin coating film has the advantages of high solidifying degree, high hardness and high adhesive force of base materials. The product of the invention is obviously environmental friendly, and can be widely applied in fields of thick coatings of various base materials and an adhesive.

Description

Technical field [0001] The invention belongs to the technical field of polyurethane coatings and adhesives, and particularly relates to a closed type ultraviolet curable waterborne polyurethane resin for thick coatings of thermally stable substrates or three-dimensional parts and a preparation method thereof. Background technique [0002] UV-curable waterborne polyurethane resins are widely used in coatings and adhesives due to their outstanding environmental protection, rapid curing and excellent comprehensive performance. Chinese patent ZL 200610038981.4 proposes a method for preparing a UV-curable waterborne polyurethane resin, which adopts the addition of a diol containing a UV-curable acrylate group to the prepolymer, and a monohydroxy acrylate for end-capping. Acrylic double bonds are introduced into the side chains and chain ends of the polyurethane molecules, and the UV-curable polyurethane emulsion prepared therefrom has good storage stability. The coating obtained after...

Claims

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Application Information

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IPC IPC(8): C08G18/67C08G18/83C08G18/10C09D175/14C09J175/14
Inventor 张兴元戴家兵白晨艳李维虎
Owner UNIV OF SCI & TECH OF CHINA
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