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Reversible thermochromic microcapsule and preparation method thereof

A thermochromic and microcapsule technology, applied in the directions of microcapsule preparation, microsphere preparation, color-changing fluorescent materials, etc., can solve the problems of high price of reversible thermochromic pens, difficulty in ink market promotion, increase in ink cost, etc. Mass production, increased color intensity, reduced usage effects

Active Publication Date: 2012-12-05
航托星(北京)新材料科技合伙企业(有限合伙)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since Pilot Ink Co., Ltd. uses electron-donating coloring organic compounds such as diphenylmethane 2-benzo(c)furanone, phenylindolyl 2-benzo(c)furanone, indolyl 2-benzo(c)furanone, (c) furanones, diphenylmethaneaza-2-benzo(c)furanones, phenylindolylazepine-2-benzo(c)furanones, fluoranes, styrylquinolines and diazepines Rhodamine lactone is used as a leuco dye, and its quality is generally 1% to 5% of the total mass of the reversible thermochromic composition, so that the color development intensity of the reversible thermochromic microcapsule pigment is low, The amount used in the ink of the reversible thermochromic pen is relatively large, which causes the expensive price of the reversible thermochromic pen, which is not conducive to market promotion
At the same time, the color developer in the reversible thermochromic microcapsule pigment is an expensive bisphenol compound, which further increases the cost of the ink and brings certain difficulties to the marketing of the ink.

Method used

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  • Reversible thermochromic microcapsule and preparation method thereof
  • Reversible thermochromic microcapsule and preparation method thereof
  • Reversible thermochromic microcapsule and preparation method thereof

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preparation example Construction

[0068] The present invention also provides a preparation method of reversible thermochromic microcapsules, comprising the following steps:

[0069] Mix 3-6 parts by weight of the first leuco dye, 0.3-0.4 parts by weight of the second leuco dye, 6-7 parts by weight of the developer and 30-40 parts by weight of the ester compound, and heat to obtain a molten a mixture; the first leuco dye is fluoran dye, phenylindolyl azepine 2-benzofuranone, phenylindolyl phthalide or phenyl aza phthalide; the second leuco dye It is a leuco dye with a melting point between 80°C and 100°C; the developer is bisphenol F and phthalimide;

[0070] mixing the molten mixture with an aqueous solution of styrene-maleic anhydride copolymer and emulsifying to obtain an emulsion with a particle size of the molten mixture below 8 μm;

[0071] The emulsion is mixed with the urea-formaldehyde resin prepolymer and cured to obtain reversible thermochromic microcapsules.

[0072] According to the above parts b...

Embodiment 1

[0086] 6 parts by weight of 1,3-dimethyl-6-dibutylaminofluorane, 0.3 parts by weight of CK-16, 4 parts by weight of bisphenol F, 2 parts by weight of phthalimide and 30 4-benzyloxyphenethyl decanoate in parts by weight is mixed, and after being heated to 110° C., a molten mixture is obtained;

[0087] The molten mixture is used as the oil phase, and 180 parts by weight of a 5% SMA aqueous solution is used as the continuous phase, and high-speed shear emulsification is carried out at a temperature of 60 ° C. After 30 minutes, the particle size of the oil phase is 2 μm to 3 μm. lotion;

[0088] Add 30 parts by weight of urea-formaldehyde resin prepolymer to the emulsion, solidify at a temperature of 80° C., and obtain reversible thermochromic microcapsules after 2 hours.

[0089] The average particle size of the reversible thermochromic microcapsules is 2.5 μm; the reversible thermochromic microcapsules change from orange to colorless through temperature changes, the complete d...

Embodiment 2

[0091] 6 parts by weight of 1,3-dimethyl-6-dibutylaminofluorane, 0.3 parts by weight of CK-37, 4 parts by weight of bisphenol F, 2 parts by weight of phthalimide and 30 4-benzyloxyphenethyl decanoate in parts by weight is mixed, and after being heated to 110° C., a molten mixture is obtained;

[0092] The molten mixture is used as the oil phase, and 180 parts by weight of a 5% SMA aqueous solution is used as the continuous phase, and high-speed shear emulsification is carried out at a temperature of 70 ° C. After 30 minutes, the particle size of the oil phase is 2 μm to 3 μm. lotion;

[0093] Add 30 parts by weight of urea-formaldehyde resin prepolymer to the emulsion, solidify at a temperature of 85° C., and obtain reversible thermochromic microcapsules after 2 hours.

[0094] The average particle size of the reversible thermochromic microcapsules is 2.0 μm; the reversible thermochromic microcapsules change from orange to colorless through temperature changes, the complete d...

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Abstract

The invention provides a reversible thermochromic microcapsule. The reversible thermochromic microcapsule comprises a core material and a wall material, wherein the core material comprises 3-6 parts by weight of first leuco dye, 0.3-0.4 part by weight of second leuco dye, 6-7 parts by weight of color developing agent and 30-40 parts by weight of ester compound by weight, wherein the first leuco dye is a fluorane dye, phenyl indolyl aza-2-benzofuraone, phenyl indolyl phthalide or phenyl aza-phthalide; the second leuco dye is a leuco dye with the melting point of 80-100 DEG C; the color developing agent is a mixture of bisphenol F and phthalimide; and the wall material is a wall system formed by a styrene-maleic anhydride copolymer and a urea formaldehyde resin prepolymer. The invention further provides a preparation method for the reversible thermochromic microcapsule. Due to the adoption of the compounded leuco dyes, the color development intensity of the microcapsule can be improved and the usage amount of the microcapsule in an ink can be reduced; and due to the adoption of the compounded color developing agent, the price is lower and the popularization is facilitated.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a reversible thermochromic microcapsule and a preparation method thereof. Background technique [0002] Thermochromic materials are special functional materials that have the property of changing color with temperature. Among them, when the material is heated to a certain temperature, the color changes, showing a new color, and when it is cooled again, it returns to the original color again. This material is called a reversible thermochromic material. At present, the research on the application of reversible thermochromic materials has been widely extended to various fields of daily life. [0003] Baile Ink Co., Ltd. has launched a reversible thermochromic pen called Magic Friction Pen. The handwriting written by this pen will fade when it encounters a heat source above 60°C. When the faded handwriting encounters a heat source below -20°C It will reappear when the source...

Claims

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Application Information

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IPC IPC(8): C09K9/02B01J13/14
Inventor 朱久云王鑫张存泰
Owner 航托星(北京)新材料科技合伙企业(有限合伙)
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