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Hydrophobic aqueous polyurethane ink and preparation process thereof

A water-based polyurethane, hydrophobic technology, applied in the field of plastic masterbatch, can solve the problems of poor water resistance and mechanical properties, poor polyurethane performance, reducing the content of hydrophilic groups, etc., to reduce water absorption, improve hydrophobicity, The effect of increasing the roughness

Pending Publication Date: 2019-02-01
楼乐超
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with solvent-based polyurethane, it has disadvantages such as water resistance and poor mechanical properties, which limit the scope of application
Especially the water-based polyurethane prepared by the external emulsification method, because it uses the conventional anionic emulsifier sodium dodecylbenzene sulfonate, will bring potential harm to food packaging, and its application is greatly limited
In the current technology, the improvement of the performance of water-based polyurethane is mostly modified. The commonly used methods include cross-linking modification, blending modification, and reducing the content of hydrophilic groups. However, these methods do not significantly improve the performance of polyurethane. And the preparation process is more complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0050] The preparation technology of described hydrophobic water-based polyurethane ink, comprises the steps:

[0051] Step S1, add the modified water-based polyurethane emulsion and half of the dispersant into the disperser, add the pigment, filler and leveling agent in three batches at a speed of 300r / min, after adding, increase the speed to 1200r / min, and disperse for 10 -15min, the resin can effectively wet and wrap the pigment to obtain the color paste;

[0052] Step S2, transfer the above-mentioned color paste to a sand mill for repeated grinding, and fully disperse the pigment and filler in the resin emulsion by squeezing and shearing the sand grinding beads, so that the particle size of the obtained slurry is ≤5 μm , to obtain grinding paste;

[0053] Step S3, add chitosan to dilute acetic acid, heat the system to 40°C, stir to dissolve chitosan completely, and obtain chitosan dilute acid solution; change the structure of chitosan by acetic acid to dissolve it, and ha...

Embodiment 1

[0056] A hydrophobic water-based polyurethane ink, made of the following raw materials in parts by weight: 40 parts of modified water-based polyurethane emulsion, 15 parts of filler, 18 parts of pigment, 2 parts of chitosan, 20 parts of dilute acetic acid, 0.5 parts of defoamer, 0.5 part of dispersant, 0.1 part of leveling agent, 0.1 part of thickener;

[0057] Described hydrophobic type water-based polyurethane ink is made by following steps:

[0058] Step S1, add the modified water-based polyurethane emulsion and half of the dispersant into the disperser, add the pigment, filler and leveling agent in three batches at a speed of 300r / min, after adding, increase the speed to 1200r / min, and disperse for 10min , so that the resin can effectively wet and wrap the pigment to obtain the color paste;

[0059] Step S2, transfer the above-mentioned color paste to a sand mill for repeated grinding, and fully disperse the pigment and filler in the resin emulsion by squeezing and sheari...

Embodiment 2

[0063] A hydrophobic water-based polyurethane ink, made of the following raw materials in parts by weight: 45 parts of modified water-based polyurethane emulsion, 18 parts of filler, 22 parts of pigment, 2.5 parts of chitosan, 25 parts of dilute acetic acid, 0.8 part of defoamer, 1 part of dispersant, 0.3 part of leveling agent, 0.6 part of thickener;

[0064] Described hydrophobic type water-based polyurethane ink is made by following steps:

[0065] Step S1, add the modified water-based polyurethane emulsion and half of the dispersant into the disperser, add the pigment, filler and leveling agent in three batches at a speed of 300r / min, after adding, increase the speed to 1200r / min, and disperse for 12min , so that the resin can effectively wet and wrap the pigment to obtain the color paste;

[0066] Step S2, transfer the above-mentioned color paste to a sand mill for repeated grinding, and fully disperse the pigment and filler in the resin emulsion by squeezing and shearin...

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Abstract

The invention discloses a hydrophobic aqueous polyurethane ink. The hydrophobic aqueous polyurethane ink comprises the following raw materials in parts by weight: 40-50 parts of a modified aqueous polyurethane emulsion, 15-20 parts of a filler, 18-26 parts of a pigment, 2-3 parts of chitosan, 20-30 parts of dilute acetic acid, 0.5-1 part of a defoaming agent, 0.5-1.5 parts of a dispersing agent, 0.1-0.5 parts of a leveling agent, and 0.1-1 part of a thickener. The invention also discloses a preparation process of the hydrophobic aqueous polyurethane ink. The method adopts the modified aqueouspolyurethane emulsion as a resin matrix, and adds a proper proportion of a filler, a pigment and an auxiliary agent, so that the ink has excellent hydrophobicity, weather resistance, chemical resistance and high temperature resistance; at the same time, a natural antibacterial agent chitosan is added, so that the ink has certain antibacterial property, also has degradability and is more environmentally friendly, the ink has the advantages of low production cost, water and abrasion resistance, good printing effect, environmental protection, and safety, and widens the application range of traditional polyurethane aqueous inks.

Description

technical field [0001] The invention belongs to the technical field of plastic master batches, and in particular relates to a hydrophobic water-based polyurethane ink and a preparation process thereof. Background technique [0002] Due to its excellent environmental protection performance, water-based ink can solve the current emission and pollution problems in the packaging and printing industry. It has received more and more attention and has become the main object of current research. At the same time, its use will also replace Traditional solvent-based inks. Water-based ink has two remarkable features: one is low viscosity and good fluidity; the other is that it does not use organic solvents, which is conducive to environmental protection. Water-based ink uses water as a solvent, and its VOC content is extremely low. Compared with solvent-based inks, it greatly improves the working environment of ink manufacturers and printing operators, thereby reducing the harm of har...

Claims

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Application Information

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IPC IPC(8): C09D11/102C09D11/03
CPCC09D11/03C09D11/102
Inventor 楼乐超
Owner 楼乐超
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