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A kind of preparation method and product of water-based polyurethane emulsion that temporarily protects stripping water-based screen printing ink

A technology of water-based polyurethane and screen printing ink, which is applied in the field of preparation of water-based polyurethane emulsion products and water-based polyurethane emulsion. It can solve the problems of affecting the aesthetics of the panel, the mold cannot be tightly combined with the transparent plastic panel, and the edge of the window is not neat, etc., so as to improve the stripping effect , excellent yellowing resistance, easy peeling effect

Active Publication Date: 2017-09-19
DONGGUAN HONGDA POLYUREFHANE RESIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual processing process, the mold is often not tightly combined with the transparent plastic panel, so that after spraying, there will be misty irregular edges at the edge of the window, that is, burrs, which will directly affect the aesthetics of the panel.

Method used

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  • A kind of preparation method and product of water-based polyurethane emulsion that temporarily protects stripping water-based screen printing ink
  • A kind of preparation method and product of water-based polyurethane emulsion that temporarily protects stripping water-based screen printing ink
  • A kind of preparation method and product of water-based polyurethane emulsion that temporarily protects stripping water-based screen printing ink

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of the water-based polyurethane emulsion of the temporary protection strippable water-based screen printing ink provided by the present embodiment may further comprise the steps:

[0025] 1) Take raw materials according to the following weight percentages:

[0026]

[0027] 2) Prepare polyurethane prepolymer:

[0028] Add the accurately weighed polymer polyols and antioxidants into a reaction tank with a stirrer and a thermometer, dehydrate at 110°C-120°C and a vacuum of -0.09MPa for 2 hours, and then pass N 2 Under protection, add isocyanate and catalyst, react at 60-90°C for 1-3 hours; then add hydrophilic chain extender, cross-linking agent, solvent in the reaction tank, react at 50-70°C for 2-5 hours, Cool down to 20-50°C, add solvent to dilute to obtain polyurethane prepolymer;

[0029] 3) Prepare water-based polyurethane emulsion:

[0030] Pour all the polyurethane prepolymer obtained above into a high-speed shear disperser, add a neut...

Embodiment 2

[0036] Embodiment 2: the preparation method and water-based polyurethane emulsion provided by this embodiment are basically the same as embodiment 1, and its difference is that,

[0037] 1) Its raw material is made up of each component of following percentage by weight:

[0038]

[0039]

[0040] Described polymer polyol is polytetrahydrofuran diol;

[0041] Described isocyanate is isophorone isocyanate (IPDI);

[0042] Described hydrophilic chain extender is dimethylolpropionic acid (DMPA);

[0043] The crosslinking agent is trimethylolpropane of trifunctionality;

[0044] The chain extender is difunctional ethylenediamine;

[0045] Described catalyst is dibutyltin dilaurate;

[0046] Described antioxidant is antioxidant 1010;

[0047] Described neutralizing agent is triethylamine;

[0048] Described solvent is acetone.

[0049] 2) Prepare polyurethane prepolymer:

[0050] Add accurately weighed polymer polyols and antioxidants into a reaction tank with a stirrer ...

Embodiment 3

[0053] Embodiment 3 The preparation method and water-based polyurethane emulsion provided by the present embodiment are basically the same as those in Embodiment 1 and 2, and the difference is that

[0054] 1) Its raw material is made up of each component of following percentage by weight:

[0055]

[0056] Described polymer polyol is the polyoxypropylene glycol that molecular weight is 2000;

[0057] The isocyanate is hydrogenated MDI;

[0058] Described hydrophilic chain extender is dimethylolpropionic acid (DMPA);

[0059] The crosslinking agent is trimethylolpropane of trifunctionality;

[0060] The chain extender is difunctional ethylenediamine;

[0061] Described catalyst is stannous octoate;

[0062] Described antioxidant is antioxidant 1010;

[0063] Described neutralizing agent is triethylamine;

[0064] Described solvent is acetone.

[0065] 2) Prepare polyurethane prepolymer:

[0066] Add accurately weighed polymer polyols and antioxidants into a reaction...

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Abstract

The invention provides a preparation method of an aqueous polyurethane emulsion for tje protection of a strippable aqueous silkscreen printing ink. The method is characterized in that the method comprises the following steps: 1, weighing raw materials according preset weight percentages; 2, preparing an aqueous polyurethane prepolymer; and 3, preparation of the income aqueous emulsion: emulsifying the obtained aqueous polyurethane prepolymer, carrying out chain extension, and removing a solvent. The invention also provides the aqueous polyurethane emulsion prepared by adopting the method. The aqueous polyurethane solid content and the elongation of the aqueous polyurethane emulsion are above 35% and 400-500% respectively. The method is scientific and reasonable, and is convenient to industrialize; and the product preferably uses a material having low adhesion to a plastic panel, a film formed by drying the emulsion has excellent elasticity and strength, is convenient to strip and can resist the solvent, poor solvent type coatings do not permeate the formed strippable aqueous printing ink temporary protection film to erode the plastic panel, so the temporary protection effect is realized.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for preparing a water-based polyurethane emulsion used for temporarily protecting peelable water-based screen printing inks and water-based polyurethane emulsion products. Background technique [0002] In the manufacturing process of electrical and electronic products, special processing and treatment are required for the viewing board, including coating on the surface of the transparent plastic panel. Generally, windows must be opened on the panel. When finishing the panel with the window, the traditional method is to cover the window on the back of the plastic panel with a pre-made mold to prevent the paint from being sprayed. window. However, in the actual processing process, the mold is often not tightly combined with the transparent plastic panel, so that after spraying, there will be misty irregular edges at the edge of the window, that is, burrs, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/12C09D11/102
CPCC08G18/12C08G18/348C08G18/4808C08G18/4845C08G18/4854C08G18/6685C08G18/6692C08K5/1345C09D11/102C08G18/3228C08G18/3234
Inventor 刘云发王瑞宏原素萍
Owner DONGGUAN HONGDA POLYUREFHANE RESIN
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