Hollow microsphere-containing waterborne polyurethane matting resin and preparation method thereof

A technology of water-based polyurethane and matting resin, which is applied in the preparation of microspheres, polyurea/polyurethane coatings, microcapsule preparations, etc. It can solve the problems of multi-seed appearance of the film, uneven dispersion of matting agents, and easy condensation of components. Achieve the effects of avoiding poor compatibility of physical mixing, environmentally friendly and simple preparation method, and excellent mechanical properties

Inactive Publication Date: 2019-02-22
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, it will also bring defects such as easy condensation of components, uneven dispersion of matting agent and easy sedimentation, multi-seed appearance of the film, and high brittleness of the coating.
The matting resin without adding matting agent relies on increasing the particle size of the emulsion to obtain a rough surface after drying to achieve the matting effect, so the prepared emulsion has poor stability and poor rigidity of the film.

Method used

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  • Hollow microsphere-containing waterborne polyurethane matting resin and preparation method thereof
  • Hollow microsphere-containing waterborne polyurethane matting resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Raw material used in this embodiment and weight description are as follows:

[0030] 20g of toluene diisocyanate, 480g of acetone-water mixture (mix acetone and water uniformly at a mass ratio of 6:4 to obtain acetone-water mixture), 8g of diethylenetriamine, 15.5g of isophorone diisocyanate, polyethylene glycol Butylene glycol ester diol 25g (molecular weight 2000), stannous octoate 0.05g, dimethylol butyric acid 1.4g, 1,4-butanediol 1.5g, triethylamine 1g, deionized water 100g.

[0031] see figure 1 , the preparation operation steps of adding the water-based polyurethane matting resin of hollow microspheres are as follows:

[0032] (1) Slowly add 20g of toluene diisocyanate into 480g of acetone-water mixture, keep the rotation speed at 30rpm at 30°C, stir slowly for 3h, add 8g of diethylenetriamine cross-linking agent and drip it within 3h to obtain poly Urea core-shell microsphere dispersion;

[0033] (2) Ultrasound the dispersion of polyurea core-shell microspher...

Embodiment 2

[0037] Raw material used in this embodiment and weight description are as follows:

[0038] Toluene diisocyanate 20g, acetone-water mixture 480g (mix acetone and water uniformly to obtain acetone-water mixture at a mass ratio of 7: 3), triethylenetetramine 8.5g, isophorone diisocyanate 16g, polycarbonate Diol 25g (molecular weight 2000), stannous octoate 0.05g, dimethylol butyric acid 1.4g, 1,4-butanediol 1.5g, triethylamine 1g, deionized water 100g.

[0039] see figure 1 , the preparation operation steps of adding the water-based polyurethane matting resin of hollow microspheres are as follows:

[0040] (1) Slowly add 20g of toluene diisocyanate into 480g of acetone-water mixture, keep the rotation speed at 30rpm at 30°C, slowly stir for 3h, then add 8.5g of diethylenetriamine cross-linking agent and drop it in 3h to prepare Obtain polyurea core-shell microsphere dispersion;

[0041] (2) Ultrasound the dispersion of polyurea core-shell microspheres for 30 minutes to disperse...

Embodiment 3

[0045] Raw material used in this embodiment and weight description are as follows:

[0046] Toluene diisocyanate 20g, acetone water mixture 280g, the mass ratio of the two is 8:2, diethylenetriamine 8g, toluene diisocyanate 14g, polybutylene adipate diol 25g (molecular weight 2000), dihydroxy 1.4g methyl propionic acid, 2g 1,4-butanediol, 1g triethylamine, 120g deionized water.

[0047] see figure 1 , the preparation operation steps of adding the water-based polyurethane matting resin of hollow microspheres are as follows:

[0048] (1) Slowly add 20g of toluene diisocyanate into 480g of acetone-water mixture, keep the rotation speed at 30rpm at 30°C, slowly stir for 3h, then add 8g of diethylenetriamine cross-linking agent and drop it in 3h to obtain Polyurea core-shell microsphere dispersion;

[0049] (2) Ultrasound the dispersion of polyurea core-shell microspheres for 30 minutes to disperse evenly, centrifuge at a high speed of 10,000 rpm for 10 minutes, wash the polyure...

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Abstract

The invention relates to hollow microsphere-containing waterborne polyurethane matting resin and a preparation method thereof. Hollow microspheres are polyurea hollow microspheres; the average particle diameter of the hollow microspheres is 200-600nm; the mass of the polyurea hollow microspheres is 10-30% of the mass of the waterborne polyurethane matting resin; the waterborne polyurethane mattingresin is subjected to vacuum drying in a mold to obtain a glue film; the glossiness of the glue film at 60 DEG C is 2.5-4.0; and the tensile strength of the glue film is 17.0 to 22.5 MPa. The preparation method comprises the following steps: reacting polyisocyanate with water, adding an amine crosslinking agent to generate polyurea core-shell microspheres, dissolving out cores under the action ofan acetic acid solvent to prepare the polyurea hollow microspheres, and adding the polyurea hollow microspheres to waterborne polyurethane emulsion to obtain the waterborne polyurethane matting resin. The waterborne polyurethane matting resin has very good strength, and does not break even under the action of strong external force and high-speed collision of a high-speed mixer and an extruder, and therefore, the formed waterborne polyurethane glue film has good extinction and an excellent mechanical property; and the stability of the waterborne polyurethane matting resin is improved.

Description

technical field [0001] The invention belongs to the technical field of water-based matte coatings, and in particular relates to a preparation method of water-based polyurethane matting resin added with hollow microspheres. Background technique [0002] Water-based matte coatings are sought after because the surface of the coated object presents low gloss after coating, and the appearance is soft and non-glare, which is comfortable. As the main film-forming component of matte coatings, the preparation of waterborne polyurethane matting resin has become the focus of research. Most traditional matte coatings are prepared by adding a matting agent. When the coating film is dry, the matting agent floats on the surface, resulting in a rough surface and diffuse reflection of light to achieve a matting effect. For example, a kind of preparation method of indoor physical matting type polyester resin and coating, it adds physical matting agent, and various curing accelerators in coat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/42C08G18/75C08G18/76C08G18/30C08G18/32C08G18/34B01J13/14C09D175/06C09D7/65
CPCB01J13/14C08G18/0823C08G18/302C08G18/3206C08G18/3228C08G18/348C08G18/4238C08G18/755C08G18/7614C08L2205/20C09D7/65C09D175/06C08L75/02
Inventor 杨建军丁琳吴庆云吴明元张建安刘久逸
Owner ANHUI UNIVERSITY
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