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Preparation and application of polyurea extinction microspheres with light scattering characteristic

A technology of light scattering and characteristics, applied in the direction of polyurea/polyurethane coatings, coatings, etc., to meet the needs of extinction, improve dispersion stability, and improve compatibility.

Active Publication Date: 2021-12-28
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These microspheres have different shapes and good performance, but there are few studies on their application in leather finishing agents and how to control the gloss of the coating through the control of particle size and appearance.
In addition, the hydrophilic modification of polyurea microspheres has rarely been reported.

Method used

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  • Preparation and application of polyurea extinction microspheres with light scattering characteristic
  • Preparation and application of polyurea extinction microspheres with light scattering characteristic
  • Preparation and application of polyurea extinction microspheres with light scattering characteristic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation and application of organic matting microspheres with light scattering properties: 100 parts of acetonitrile / water mixed solvent with a ratio of 70 / 30, 8 parts of isophorone diisocyanate, 2,4-diaminobenzenesulfonic acid 0.6 parts of sodium, mixed evenly to obtain a dispersed phase. Slowly raise the temperature to 50°C by means of static reaction, then take 4 parts of nano silicon dioxide and add it into the reaction kettle when the reaction system starts to become cloudy, mix evenly, and react for 4 hours. After centrifugation, pour off the upper layer, wash with distilled water, and centrifuge again, repeat this operation 5 times, and dry in an oven at 80 °C to obtain powdery polyurea matting microspheres with light scattering properties.

[0025] The organic extinction microspheres with light scattering characteristics prepared by the above method have a yield of 83.6%. The surface has a special groove structure, which has a scattering effect on incident li...

Embodiment 2

[0027] Preparation of organic matting microspheres with light scattering properties: 100 parts of acetonitrile / water mixed solvent with a ratio of 60 / 40, 1 part of hexamethylene diisocyanate, 0.14 parts of sodium ethylenediaminoethanesulfonate were added to the reaction kettle, Mix well to obtain a dispersed phase. Slowly raise the temperature to 60°C by constant temperature oscillation reaction, then take 0.1 part of polyvinylpyrrolidone (PVP) and add it into the reactor at the beginning of the reaction, mix it evenly, and react for 5 hours. After centrifugation, pouring off the upper layer, washing with distilled water, and centrifugation again, this operation was repeated 5 times, and dried in an oven at 100°C to obtain powdery polyurea matting microspheres with light scattering properties.

[0028] The organic extinction microspheres with light scattering characteristics prepared by the above method have a yield of 72.5%. The surface has a special groove structure, which h...

Embodiment 3

[0030] Preparation of organic matting microspheres with light scattering properties: add 100 parts of acetonitrile / water mixed solvent with a ratio of 80 / 20, 6 parts of dicyclohexylmethane diisocyanate, and 0.3 part of dimethylol propionic acid into the reaction kettle, and mix well to obtain a dispersed phase. Slowly raise the temperature to 40° C. by mechanical stirring, then take 0.6 parts of nano-calcium carbonate and add it into the reactor at the beginning of the reaction, mix evenly, and react for 6 hours. After centrifugation, pour off the upper layer, wash with distilled water, and centrifuge again, repeat this operation 5 times, and dry in an oven at 100 °C to obtain powdery polyurea matting microspheres with light scattering properties.

[0031] The organic extinction microspheres with light scattering characteristics prepared by the above method have a yield of 79.6%. The surface has a special groove structure, which has a scattering effect on incident light. The a...

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Abstract

The invention discloses preparation and application of polyurea extinction microspheres with light scattering characteristics, and the preparation of the extinction microspheres comprises the following raw material components in parts by weight: 100 parts of an acetonitrile / water mixed solvent, 1-10 parts of a monomer, 0.1-1 part of a hydrophilic monomer and 0.1-4 parts of a surface roughening agent, the polyurea microspheres with different particle sizes and surface roughness are prepared in a water / acetonitrile system through a precipitation polymerization method, the polyurea microspheres are used as a water-based coating matting auxiliary agent, the particle sizes and the surface roughness of the polyurea microspheres are controlled by adjusting the dosage of MPDSA-Na, the dosage of IPDI, the dosage of SiO2 and the like, and then the glossiness of the coating is adjusted. The polyurea microspheres and waterborne polyurethane are compounded to be used for coating surface glossiness treatment, the glossiness of the surfaces of coatings such as synthetic leather can be remarkably reduced, the particle size distribution ranges from 1 micrometer to 2 micrometers, and the polyurea microspheres high in surface roughness have a better matting effect. Therefore, the polyurea extinction microsphere with the light scattering characteristic has a wide application prospect in coatings of automotive trim leather and furniture decorative leather.

Description

technical field [0001] The invention belongs to the field of preparation of functional polymer materials, in particular to the preparation and application of polyurea matting microspheres with light scattering properties. Background technique [0002] Waterborne polyurethane is widely used in leather, textile, automobile, furniture and other fields due to its environmental friendliness and excellent performance. One of the basic uses of water-based polyurethane is as a leather finishing agent. After finishing, the leather products can show the characteristics of smoothness, softness and strong adhesion. In recent years, with the development of people's aesthetics and safety considerations, the demand for matte polyurethane coatings in the fields of automotive interiors and home decorations has continued to increase. [0003] Usually matting coatings are obtained by adding matting powders, which are generally divided into organic and inorganic matting powders. The most commo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/73C08G18/34C08G18/38C09D175/04C09D7/42
CPCC08G18/755C08G18/73C08G18/758C08G18/348C08G18/3855C09D175/04C09D7/42C08L75/02
Inventor 范浩军贾亮陈意向均颜俊高强章爱琴彭豪
Owner SICHUAN UNIV
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