Waterborne polyurethane for flocking adhesive and preparation method thereof

A water-based polyurethane and flocking adhesive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc. Maintain the effect of wear resistance, good water resistance and good softness

Inactive Publication Date: 2020-04-10
SHANGHAI 3N CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, water-based polyurethane flocking adhesive also has the problems of poor water resistance and ethanol resistance, which limits the wider application of water-based polyurethane flocking adhesive.

Method used

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  • Waterborne polyurethane for flocking adhesive and preparation method thereof
  • Waterborne polyurethane for flocking adhesive and preparation method thereof
  • Waterborne polyurethane for flocking adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020]

[0021] Take the following process to prepare:

[0022] S1. Melt and mix PTMEG, polycarbonate diol PCD, and polyacrylate polyamine at 125°C for 1.5 hours, and vacuum dehydrate for 2 hours until the water content of the material is lower than 400ppm; the lower the water content, the better Control of prepolymer synthesis;

[0023] S2. Prepolymerization: react the isocyanate and the dehydrated polyol component at 85°C for 2 hours;

[0024] S3. Chain extension: add DMPA and TMP to the prepolymer, and perform chain extension reaction at 75°C for 3 hours until the NCO content is close to the theoretical value;

[0025] S4. Neutralization and emulsification: lower the temperature of the prepolymer to 55°C, add a neutralizer and stir quickly for neutralization, and emulsify the prepolymer in water after 30 minutes of neutralization;

[0026] S5. Post-chain extension: Dissolve IPDA in an appropriate amount of water and drop it into the emulsion for post-chain extension. ...

Embodiment 2

[0028]

[0029] Take the following process to prepare:

[0030] S1. Melt and mix polyether polyols PPG, PCD, and polyacrylate polyols at 120°C for 1.5 hours, vacuumize and dehydrate for 2 hours, until the water content of the materials is lower than 400ppm;

[0031] S2. Prepolymerization: react the isocyanate and the dehydrated polyol component at 85°C for 2 hours;

[0032] S3. Chain extension: add DMPA and TMP to the prepolymer, and perform chain extension reaction at 75°C for 2.5 hours until the NCO content is close to the theoretical value;

[0033] S4. Neutralization and emulsification: lower the temperature of the prepolymer to 55°C, add a neutralizer and stir quickly for neutralization, and emulsify the prepolymer in water after 30 minutes of neutralization;

[0034] S5. Post-chain extension: EA is dissolved in an appropriate amount of water and dropped into the emulsion for post-chain extension.

Embodiment 3

[0036]

[0037]

[0038] Take the following process to prepare:

[0039] S1. Melt and mix PTMEG, PCD, and polyacrylate polyol at 125°C for 1.5 hours, and vacuum dehydrate for 2 hours until the water content of the material is lower than 400ppm;

[0040] S2. Prepolymerization: react IPDI and dehydrated polyol components at 85°C for 2 hours;

[0041] S3. Chain extension: Add DMBA and TMP to the prepolymer, and perform chain extension reaction at 75°C for 3 hours until the NCO content is close to the theoretical value;

[0042] S4. Neutralization and emulsification: lower the temperature of the prepolymer to 55°C, add TEA to quickly stir for neutralization, and emulsify the prepolymer in water after 30 minutes of neutralization;

[0043] S5. Post-chain extension: Dissolve IPDA in an appropriate amount of water and drop it into the emulsion for post-chain extension.

[0044] Use the water-based polyurethane flocking glue formulated above, and use the same compound formula ...

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PUM

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Abstract

The invention discloses waterborne polyurethane for a flocking adhesive and a preparation method thereof. The waterborne polyurethane comprises the following components: isocyanate, polyether polyol,polyester polyol, polyacrylate polyol, a micromolecular chain extender and water, wherein the isocyanate is 4,4'-dicyclohexylmethane diisocyanate or isophorone diisocyanate. The preparation method comprises the following steps: melting the polyether polyol, the polyester polyol and the polyacrylate polyol, carrying out mixing, vacuumizing and dehydrating until the water content of a material is lower than 400 ppm, and carrying out pre-polymerization, chain extension, neutralization emulsification and post-chain extension so as to prepare the waterborne polyurethane used for the flocking adhesive. The waterborne polyurethane provided by the invention has good water resistance and ethanol resistance, keeps wear resistance and low-temperature resistance at the same time, and has good flexibility.

Description

technical field [0001] The invention relates to a polyurethane and a preparation method thereof, in particular to a water-based polyurethane for flocking glue and a preparation method thereof. Background technique [0002] The flocking glue bonds the material and the fluff through the electrostatic flocking process, which can endow the surface of the flocked material with three-dimensionality, bright colors, and soft touch. With the strengthening of people's awareness of environmental protection, water-based flocking glue has gradually replaced traditional solvent-based flocking glue. Water-based flocking glue is mainly divided into two types: water-based acrylic and water-based polyurethane. The price of water-based acrylic emulsion is relatively cheap, but the properties of water-based polyurethane such as wear resistance and low temperature resistance are better than water-based acrylic emulsion. At the same time, water-based polyurethane flocking adhesive also has the ...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/62C08G18/48C08G18/44C08G18/32C08G18/34C09J175/04C09J175/08
CPCC08G18/3206C08G18/348C08G18/4018C08G18/4063C08G18/44C08G18/48C08G18/4854C08G18/6225C08G18/6611C08G18/6625C08G18/755C08G18/758C09J175/04C09J175/08
Inventor 刘礼
Owner SHANGHAI 3N CHEM
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