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Preparation method of reversible photochromic microcapsule material

A photochromic and microcapsule technology, which is applied in the direction of microcapsule preparation, color-changing fluorescent materials, microsphere preparation, etc., can solve the problems of ineffective protection and influence of photochromic materials

Inactive Publication Date: 2018-06-08
YIXING GUANGHUI PACKAGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the photochromic material in the system cannot be effectively protected, it will inevitably have a certain impact on its function

Method used

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Examples

Experimental program
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Embodiment Construction

[0024] Specifically, in a reaction kettle equipped with a stirrer, a spherical condenser and a thermometer, a certain amount of distilled water is added according to the proportion, and an emulsifier is added for heating at the same time. Esters, after fully stirring and emulsifying, add spiropyran compound and cholesteryl ester, mix for 3-5 minutes, then blow nitrogen into the system for 10-20 minutes, then add potassium persulfate aqueous solution at 75°C to initiate polymerization; wait for the first step After the reaction is completed, add the pre-dissolved second-step initiator and add ethyl acrylate monomer dropwise with a feeder at a rate of 0.8-0.9ml / min. After the dropwise addition, react at 75°C for half an hour; to the above reaction Methyl methacrylate monomer was added dropwise into the system at a rate of 0.7-0.8ml / min. After the dropwise addition was completed, the temperature was raised to 85°C for 1.5 hours to react. After the reaction, use 0.5% aluminum sulf...

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PUM

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Abstract

The invention discloses a preparation method of a reversible photochromic microcapsule material. A three-layer microcapsule material, which takes spiropyrane, cholesterol ester and butyl acrylate graft as a core, polyethyl acrylate as an inner shell and polymethyl methacrylate as an outer shell, is prepared. The photochromic material is grafted with butyl acrylate, so that the stability can be enhanced, the defects that a spiropyrane compound is liable to oxidation and the fatigue resistance is low can be overcome, and cholesterol ester liquid crystal layered molecules are distributed more evenly. The polyethylene acrylate serves as the inner shell, so that the photochromic molecules in the core can be protected well and external stress generated by shearing in the processing process can be avoided. The outermost layer of polymethyl methacrylate has high rigidity, forms a hard shell on the outermost side of the capsule and forms a first protective layer. In addition, the solubility parameter of the polymethyl methacrylate is close to that of PVC, the polymethyl methacrylate and the PVC have high compatibility, the photochromic material can be dispersed into the PVC system uniformlyand the effect can be exerted well.

Description

technical field [0001] The invention relates to the technical field of PVC heat-shrinkable film labels, in particular to a method for preparing a reversible photochromic microcapsule material for making PVC heat-shrinkable film labels. Background technique [0002] To make the PVC heat shrinkable label film have the photochromic function, it is necessary to introduce a reversible photochromic material into the formula system, and ensure that the material can normally exert its color changing function during the use of the film. [0003] Photochromic phenomenon means that a compound (A) can undergo a specific chemical reaction to obtain a product (B) under the irradiation of a certain wavelength of light. Due to the change of structure, its absorption spectrum changes significantly (colorization occurs). ). Under the irradiation of light of another wavelength or under the action of heat, it can return to its original form. Substances that can produce this photochromic pheno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/14B01J13/22C08F265/06C08F220/18C09K9/02
CPCB01J13/14B01J13/22C09K9/02C08F265/06C09K2211/145C09K2211/1416C08F220/1804
Inventor 杨涛杨铄冰殷宇晨陈亚龙
Owner YIXING GUANGHUI PACKAGE
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