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Light/heat curable waterborne polyurethane coating agent with branch type molecular structure and preparation method thereof

A technology of water-based polyurethane and molecular structure, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as no research reports on water-based polyurethane coating agents, and achieve improved appearance quality, fast curing speed, and film-forming time shortened effect

Inactive Publication Date: 2009-08-26
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] But up to the present, the inventor has not seen the relevant research reports about the light / heat dual curing water-based polyurethane finishing agent of dendritic structure

Method used

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  • Light/heat curable waterborne polyurethane coating agent with branch type molecular structure and preparation method thereof
  • Light/heat curable waterborne polyurethane coating agent with branch type molecular structure and preparation method thereof
  • Light/heat curable waterborne polyurethane coating agent with branch type molecular structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] [Example 1] Anionic aromatic soft polyurethane finishing agent

[0032] (1) Preparation of anionic aromatic polyurethane prepolymer:

[0033] In a three-necked flask equipped with a condensing device and an electric stirrer, the molar ratio is n NCO / n OH =2.3:1 Add diethylene glycol and toluene diisocyanate (TDI) (or 4,4'-diphenylmethane diisocyanate (MDI)), keep warm at 40°C for about 1 hour; add the above diisocyanate and Acetone with 5% of the total mass of dihydric alcohol and dimethylol propionic acid with 2% of the total mass of the above-mentioned diisocyanate and diethylene glycol, the temperature was raised at about 75°C for about 2 hours, and the molar fraction of diisocyanate was added 20% polyether diol 3000, keep warm at about 75°C and react for about 1.5 hours.

[0034] (2) Polyurethane with branched structure:

[0035] Cool down to about 50°C, add pentaerythritol accounting for 13% of the diisocyanate mole fraction in (1), add a catalyst dibutyltin d...

Embodiment 2

[0038] [Example 2] Anionic aromatic rigid polyurethane finishing agent

[0039] (1) Preparation of anionic aromatic polyurethane prepolymer:

[0040] In a three-necked flask equipped with a condensing device and an electric stirrer, the molar ratio is n NCO / n OH = 2.1:1 Add neopentyl glycol and toluene diisocyanate (TDI) (or 4,4'-diphenylmethane diisocyanate (MDI)), keep warm at 40°C for about 1 hour; add the above diisocyanate and binary Acetone with 5% of the total mass of alcohol and dimethylol propionic acid with 2% of the total mass of diisocyanate and neopentyl glycol are heated up to about 80°C and reacted for about 1 hour. Ether diol 500, keep warm at 80°C for about 1.5 hours.

[0041] (2) Polyurethane with branched structure:

[0042] Cool down to about 60°C, add dipentaerythritol accounting for 8% of the diisocyanate mole fraction in (1), add the catalyst stannous octoate with a mass of 0.15% of the polyurethane prepolymer prepared by (1), and heat up to about 8...

Embodiment 3

[0045] [Example 3] anionic aliphatic rigid polyurethane finishing agent

[0046] (1) Preparation of anionic aliphatic polyurethane prepolymer:

[0047] In a three-necked flask equipped with a condensing device and an electric stirrer, the molar ratio is n NCO / n OH = 2.5:1 Add neopentyl glycol and isophorone diisocyanate (IPDI), add 0.1% catalyst triethylenediamine of the total mass of the system, keep warm at 40°C for about 2 hours; add the above-mentioned diisocyanate and binary Butanone with 5% of the total mass of alcohol and dimethylol butyric acid with 2% of the total mass of diisocyanate and neopentyl glycol were heated up to about 85°C for 2.5 hours, and then added the polyisocyanate that accounted for 10% of the molar fraction of diisocyanate. Ether diol 800, heat at 85°C and react for about 2 hours.

[0048] (2) Polyurethane with branched structure:

[0049] Cool down to about 60°C, add pentaerythritol accounting for 12.5% ​​of the diisocyanate mole fraction in (...

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Abstract

The invention discloses a light / heat curable waterborne polyurethane coating agent with a branch type molecular structure and a preparation method thereof, and the main components of the coating agent are as follows (by mass percentage): 20-45 percent of polyurethane with a specific structure and 55-80 percent of deionized water. The preparation method of the coating agent mainly includes the steps of preparing a polyurethane prepolymer which contains ionizable groups by diisocyanate and diol, preparing the polyurethane which contains the branch type structure by the polyurethane prepolymer and polyol, preparing the polyurethane with the specific structure by adding hydroxyl-containing acrylic ester in the polyurethane which contains the branch type structure, and adding a salt-forming agent in the polyurethane with the specific structure for even mixing and then dispersing into the deionized water, thereby preparing the light / heat curable waterborne polyurethane coating agent with he branch type molecular structure. A coating obtained after using the coating agent for coating has excellent low-temperature flexibility, and leather after the coating is characterized by high gloss, good hand feel, wear resistance, difficult break, good elasticity, good water resistance, good wrap resistance and so on.

Description

technical field [0001] The invention relates to a water-based polyurethane finishing agent, in particular to a polyurethane finishing agent whose molecular core is a dendritic structure, capable of dual curing of light and heat and a preparation method thereof. It can be used in shoe upper leather, garment leather, sofa leather and other fields. technical background [0002] Polyurethane (PU), as a new leather finishing material, has been popularized and applied in the field of leather finishing, and has attracted more and more attention, especially the water-based polyurethane finishing agent. Polyurethane, also known as polyurethane, is a general term for polymer compounds formed by the action of dibasic or polyisocyanate and dibasic or polyhydroxy compounds. The film formed by PU is soft and smooth, with pleasant luster, and has excellent properties such as friction resistance, bending resistance, aging resistance, heat resistance, cold resistance and solvent resistance....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14C09D7/12C08G18/12C08G18/73
Inventor 辛中印张帆
Owner SICHUAN UNIV
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