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A photosensitive color-changing pencil paint and a process for producing photosensitive color-changing pencils using the same

A photochromic, pencil technology, applied in non-moving pencils, multi-color effect paints, devices for coating liquids on surfaces, etc. performance, good photochromic effect, good light fatigue resistance

Active Publication Date: 2022-03-15
CHINA FIRST PENCIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional dispersant can play the role of deflocculation, so that the optical variable powder particles are distributed in a narrow range, but the traditional dispersant is also prone to desorption due to the weak combination with the surface of the optical variable powder particles, resulting in disperse Optically variable powder particles re-flocculate, causing a large color difference in the paint film on the pencil surface

Method used

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  • A photosensitive color-changing pencil paint and a process for producing photosensitive color-changing pencils using the same
  • A photosensitive color-changing pencil paint and a process for producing photosensitive color-changing pencils using the same

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0086] (1) under the protection of nitrogen atmosphere, with mass parts (1 part / kg), the n-heptanoic acid of 108 parts, the propylene glycol of 122 parts, the xylene of 1.2 parts of catalyst and 191 parts are added in the reaction kettle, then rise slowly High temperature to 180°C, continuous reaction for 13 hours;

[0087] (2) The by-product water generated in the reaction process can be removed by a water separator; after the reaction is finished, xylene and unreacted small molecule raw materials are removed by vacuum distillation; finally, the hydroxyl-terminated poly(o- Phthaloyl-ethylene glycol) ester;

[0088] (3) Next, under the protection of a nitrogen atmosphere, add xylene into the reactor, and gradually raise the temperature to 50°C; take 136 parts of hydroxyl-terminated poly(phthaloyl-ethylene glycol) ester and add it to the reactor , keep warm at 50°C for 30 minutes; then slowly add 136 parts of toluene diisocyanate into the xylene solution, and keep it warm for ...

preparation example 2

[0092] (1) under nitrogen atmosphere protection, with mass parts (1 part / kg), the n-heptanoic acid of 122 parts, the propylene glycol of 146 parts, the xylene of 1.4 parts of catalyzer and 217 parts are added in the reactor, then rise slowly High temperature to 180°C, continuous reaction for 13 hours;

[0093] (2) The by-product water generated in the reaction process can be removed by a water separator; after the reaction is finished, xylene and unreacted small molecule raw materials are removed by vacuum distillation; finally, the hydroxyl-terminated poly(o- Phthaloyl-ethylene glycol) ester;

[0094] (3) Next, under the protection of a nitrogen atmosphere, add xylene into the reactor, and gradually raise the temperature to 50°C; take 154 parts of hydroxyl-terminated poly(phthaloyl-ethylene glycol) ester and add it to the reactor , keep warm at 50°C for 30 minutes; then slowly add 154 parts of toluene diisocyanate into the xylene solution, and keep it warm for 2 hours;

[0...

preparation example 3

[0098] (1) under nitrogen atmosphere protection, with mass parts (1 part / kg), the n-heptanoic acid of 115 parts, the propylene glycol of 131 parts, the xylene of 1.3 parts of catalyzer and 204 parts are added in the reactor, then rise slowly High temperature to 180°C, continuous reaction for 13 hours;

[0099] (2) The by-product water generated in the reaction process can be removed by a water separator; after the reaction is finished, xylene and unreacted small molecule raw materials are removed by vacuum distillation; finally, the hydroxyl-terminated poly(o- Phthaloyl-ethylene glycol) ester.

[0100] (3) Next, under the protection of a nitrogen atmosphere, add xylene into the reaction kettle, and gradually raise the temperature to 50°C; take 145 parts of hydroxyl-terminated poly(phthaloyl-ethylene glycol) ester and add it to the reaction kettle , keep warm at 50°C for 30min; then slowly add 145 parts of toluene diisocyanate into the xylene solution, and keep warm for 2h.

...

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Abstract

The application relates to the field of pencils, and specifically discloses a photochromic pencil varnish and a process for producing photochromic pencils using the same. A photosensitive color-changing pencil paint contains the following specific raw materials: varnish, light-changing powder, mixed solvent, hyperdispersant, auxiliary agent; wherein the hyperdispersant consists of the following raw materials: n-heptanoic acid, propylene glycol, phthalo Acid anhydride, catalyst, toluene diisocyanate, xylene, N,N-dimethylaminopropylamine; the process of applying photochromic pencil paint to produce photochromic pencils is as follows: the rubber ring extrusion method is used to paint the bottom of the wooden pencil in sequence lacquer, topcoat and varnish, and they need to be dried naturally after each low-temperature drying; then, use the method of dipping to evenly distribute the contrast paint and photochromic pencil paint on the surface of the wooden pencil; finally dip the top of the wooden pencil The top coat is dried at low temperature; the photochromic pencil paint of the present application can be used to prepare high-standard photochromic pencils, and has a good photochromic effect.

Description

technical field [0001] The application relates to the technical field of pencil varnish, more specifically, it relates to a photosensitive color-changing pencil varnish and a process for producing a photosensitive color-changing pencil using the same. Background technique [0002] Light-changing powder is a photosensitive color-changing pigment synthesized by adding melamine as the shell material to the core of microcapsules. The appearance is powdery, the particle size is between 1-10 μm, and it can withstand heat up to 280°C. The light-changing powder can change color after being irradiated by ultraviolet rays or sunlight and absorbing ultraviolet rays or sunlight. When the ultraviolet rays or sunlight are lost, it will return to its original color. [0003] Light-changing powder is non-irritating to the skin, does not contain harmful substances to the human body, meets the safety toy and food packaging standards, and is usually added to inks to be made into fabrics, paper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D201/00C09D5/29C09D7/20C09D7/65B43K19/16B05D5/06B05D7/06
CPCC09D201/00C09D5/29C09D7/20C09D7/65B43K19/16B05D5/066B05D7/06C08L67/02
Inventor 李志芳
Owner CHINA FIRST PENCIL CO LTD
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