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Isocyanate derivative microcapsule and preparation method thereof

A technology of isocyanate and hexamethylene diisocyanate, which is applied in the field of isocyanate derivative microcapsules and its preparation, can solve the problems of undisclosed paint film and achieve the effect of prolonging the service life

Active Publication Date: 2013-09-04
叶氏化工研发(上海)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art does not disclose self-healing paint films

Method used

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  • Isocyanate derivative microcapsule and preparation method thereof
  • Isocyanate derivative microcapsule and preparation method thereof

Examples

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preparation example Construction

[0037] The invention provides a preparation method of isocyanate derivative microcapsules. Include the following steps:

[0038] a) mixing the auxiliary agent with the molten modified paraffin to obtain a mixture of paraffin wax and auxiliary agent;

[0039]b) adding isocyanate derivatives dropwise to the mixture of paraffin wax and additives obtained in step a), and stirring at a rate of 200r / min-1200r / min to obtain a microcapsule precursor;

[0040] c) Making the microcapsule precursor obtained in the step b) into granules to obtain isocyanate derivative microcapsules.

[0041] In the present invention, firstly, the auxiliary agent is mixed with the melted modified paraffin to obtain the mixture of paraffin wax and auxiliary agent. In the present invention, it is preferred to heat the modified paraffin above its melting point to melt the modified paraffin; then add additives to the melted modified paraffin and stir to make it evenly mixed. The present invention has no spe...

Embodiment 1

[0063] Take 3.5g of modified paraffin wax produced by BASF (BASF) in Germany and put it into a container, raise the temperature to 130°C, add 0.18g of gelatin to it, and stir for 10 minutes to make it evenly dispersed into the modified paraffin wax solution Get the HDI trimer of 6.32g again, dropwise join in the modified paraffin wax solution in 5 minutes, stir 30 minutes with the rotating speed of 300r / min, obtain the microcapsule precursor; The precursor is ejected, and the spraying pressure is 0.4 MPa to obtain the modified isocyanate derivative microcapsules.

[0064] The present invention detects that the average particle diameter of the isocyanate derivative microcapsules prepared in this example is 35 microns.

[0065] In the present invention, 10.0000 g of the isocyanate derivative microcapsules prepared in this example were stored at room temperature for 6 months without agglomeration, with a weight gain of 0.0427 g and a weight gain rate of 4.27‰, which shows that th...

Embodiment 2

[0068] Take 6.0g of modified paraffin wax produced by German BASF (BASF) company and put it into a container, raise the temperature to 70°C, add 0.12g of emulsifier to it, and stir for 10 minutes to make it evenly dispersed into the modified paraffin wax solution 3.88 g of HDI-TMP adduct was added dropwise to the paraffin solution within 5 minutes, and stirred at a speed of 1200 r / min for 30 minutes to obtain a microcapsule precursor;

[0069] The microcapsule precursor is sprayed out by an air spraying method, and the spraying pressure is 0.3 MPa to obtain the isocyanate derivative microcapsules.

[0070] The present invention detects that the average particle diameter of the isocyanate derivative microcapsules prepared in this example is 16 microns.

[0071] In the present invention, 10.0000 g of the isocyanate derivative microcapsules prepared in this example were stored at room temperature for 6 months without agglomeration, with a weight gain of 0.0639 g and a weight gain...

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Abstract

The invention provides a microcapsule using an isocyanate derivative as a core material. The microcapsule comprises the following components by weight percent: 30wt%-65wt% of modified paraffin, 34wt%-68wt% of the isocyanate derivative and 1wt%-2wt% of an additive. The microcapsule provided by the invention is of a core-shell-similar structure, and the modified paraffin is used as a wall material to package the isocyanate derivative used as the core material. When the microcapsule provided by the invention is added to a common coating, the microcapsule is stably stored in the coating during storage. After being coated to form a film, the microcapsule does not have adverse effects on the properties of the film. When the film is damaged, the microcapsule of a damaged part is fractured to release the isocyanate derivative, the isocyanate derivative is permeated along a gap until to fill up the gap of the damaged part, the isocyanate derivative is subjected to cross-linking reaction with moisture in the air to be solidified, the damaged surface of the film is successfully repaired after the isocyanate derivative is solidified to achieve the self-healing effect, and the service life of the film also can be prolonged simultaneously.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to an isocyanate derivative microcapsule and a preparation method thereof. Background technique [0002] With the improvement of people's life and aesthetic level, people pay more and more attention to the appearance and decoration of various items, so they have higher requirements for the materials used, not only must have good chroma and It has the characteristics of pollution resistance, aging resistance, moisture resistance and mildew resistance. It also has the characteristics of no pollution to the environment, safety and non-toxicity, no fire hazard, convenient construction, fast drying of the coating film, good gloss and color retention, and good air permeability. The application of lacquer has developed into a very important field. However, the topcoat often encounters accidental damage during use, and the usual way to make up for this is to use manual repairs. As we all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12B01J13/02
Inventor 姜美佳林安陈艳雄郭昊汪盛藻叶慧明
Owner 叶氏化工研发(上海)有限公司
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