Benzene and homolog thereof-free waterborne polyurethane laser transfer coating and preparation method thereof

A water-based polyurethane and laser transfer technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as easy production of defective products, environmental pollution, efficiency and stability constraints, and achieve clear patterns

Inactive Publication Date: 2012-10-10
ANHUI LINGDA CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing solvent-based laser transfer coatings use a large amount of solvents. During use, these solvents are directly discharged into the atmosphere after being baked, polluting the environment. After using a large amount of solvents, the cost also increases a lot; and the use of solvent-based When laser transfer coating, before coating the laser transfer layer, it is necessary to pre-coat the release layer on the surface of the PET base film, the process is complicated
[0003] At present, there are reports of environmentally friendly water-based laser transfer coatings in China, but they focus on the compound use of various water-based resins (excluding water-based polyurethane resins), which leads to the restriction of product efficiency and stability by various resins, and easily produces defective products.

Method used

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  • Benzene and homolog thereof-free waterborne polyurethane laser transfer coating and preparation method thereof
  • Benzene and homolog thereof-free waterborne polyurethane laser transfer coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1. Preparation of water-based polyurethane resin:

[0048] Under the protection of dry nitrogen, 25kg of polybutylene adipate diol (hydroxyl value=56, Mn=2000) after vacuum dehydration and 25kg of isophorone diisocyanate (IPDI) were added to the reaction vessel. Stir the reaction at 85°C for 2h; reduce the temperature of the reaction system to 40°C, add 4.05kg of small molecule chain extender 1,4-butanediol, crosslinker trimethylolpropane (TMP) 0.28kg, solvent acetone 20kg, catalyst two 0.001kg of dibutyltin laurate (T-12) and 0.001kg of stannous octoate (T-9), stirred at 60℃ for 3h; after the reaction, add 4.2kg of sodium N-(2-aminoethyl) ethanesulfonate When the isocyanate group (-NCO) content in the reaction system no longer changes, it is lowered to room temperature, and 1.5kg of neutralizing agent triethylamine is added to neutralize the salt; then 70kg of water and 1.23kg of ethyl are added under high shear Diamine chain extension to obtain a transparent water-based...

Embodiment 2

[0055] 1. Preparation of water-based polyurethane resin:

[0056] Under the protection of dry nitrogen, 33.75kg of polybutylene adipate diol (hydroxyl value=112, Mn=1000) and 4,4'-dicyclohexylmethane diisocyanate (H12MDI) 88.5 after vacuum dehydration kg was added to the reaction vessel, stirred for 2h at 85℃; reduced the temperature of the reaction system to 40℃, added 12.15kg of small molecule chain extender 1,4-butanediol, 10.5kg of dimethylolpropionic acid, and crosslinking agent three Methylolpropane (TMP) 0.84kg, solvent acetone 20kg, catalyst dibutyltin dilaurate (T-12) 0.002kg and stannous octoate (T-9) 0.002kg, stirred and reacted at 60℃ for 3h, wait for the reaction system When the content of isocyanate group (-NCO) does not change, it is lowered to room temperature and 7.9kg of triethylamine is added to neutralize the salt; then 358kg of water and 10.5kg of isophoronediamine are added under high shear force to extend the chain to obtain Transparent water-based polyure...

Embodiment 3

[0064] 1. Preparation of water-based polyurethane resin:

[0065] Under the protection of dry nitrogen, 33.75kg of polyhexanediol adipate diol (hydroxyl value=112, Mn=1000) after vacuum dehydration and 56.7kg of hexamethylene diisocyanate (HDI) were added to the reaction vessel ,Stir the reaction at 85℃ for 2h; reduce the temperature of the reaction system to 40℃, add 12.15kg of small molecule chain extender 1,4-butanediol, 10.5kg of dimethylolpropionic acid, and crosslinker trimethylolpropane ( TMP) 0.84kg, solvent acetone 20kg, catalyst dibutyltin dilaurate (T-12) 0.002kg and stannous octoate (T-9) 0.002kg, stirred and reacted at 60°C for 3h, and the isocyanate group (- When the NCO content does not change anymore, lower to room temperature and add 7.8kg of triethylamine to neutralize the salt; then add 408kg of water and 4.2kg of diethylenetriamine under high shear to extend the chain to obtain a transparent waterborne polyurethane emulsion; The water-based polyurethane emuls...

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Abstract

The invention discloses a benzene and homolog thereof-free waterborne polyurethane laser transfer coating and a preparation method thereof. The benzene and homolog thereof-free waterborne polyurethane laser transfer coating is prepared from the following raw materials in part by mass: 20 to 60 parts of waterborne polyurethane, 30 to 70 parts of deionized water, 0.005 to 0.01 part of defoamer, 5 to 15 parts of cosolvent, 0.2 to 0.5 part of pH regulator, 0.5 to 1.0 part of wetting agent, and 0.5 to 1.5 parts of flatting agent. The laser transfer coating consists of waterborne polyurethane resin, so that the stability of a product is greatly improved; and according to the waterborne polyurethane coating, the homolog of benzene is not generated in the process of film forming, so that the national volatile organic compound (VOC) test standard is met, and the stripping of the product with polyester (PET), the mould pressing temperature resistance, and the transferring performance all meet the standard of the laser transfer material.

Description

1. Technical Field [0001] The invention relates to a water-based transfer coating and a preparation method thereof, specifically a water-based polyurethane laser transfer coating without benzene and its homologues and a preparation method thereof. 2. Background technology [0002] Existing solvent-based laser transfer coatings use a large amount of solvents. These solvents are directly discharged into the atmosphere after baking during use, which pollutes the environment. After a large amount of solvents are used, the cost will increase a lot; and solvent-based When laser transfer coating, before coating the laser transfer layer, it is also necessary to pre-coat a release layer on the surface of the PET base film, which is a complicated process. [0003] At present, there have been reports of environmentally friendly water-based laser transfer coatings in China, but they are concentrated on the composite use of a variety of water-based resins (excluding water-based polyurethane res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C08G18/66C08G18/42
Inventor 刘都宝黎兵张文荣
Owner ANHUI LINGDA CHEM TECH
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