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Photochromic pencil paint and process for producing photochromic pencil by applying same

A photochromic and pencil technology, applied in non-moving pencils, multi-color effect paints, devices for coating liquid on surfaces, etc., can solve the problems of large color difference and weak bonding of the paint film on the surface of pencils, and achieve good photochromic , good photochromic performance, good anti-light fatigue effect

Active Publication Date: 2021-05-28
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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  • Photochromic pencil paint and process for producing photochromic pencil by applying same
  • Photochromic pencil paint and process for producing photochromic pencil by applying same

Examples

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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 catalyzer and 191 parts are added in the reactor, 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 2 hours...

preparation example 2

[0092] (1) under the protection of nitrogen atmosphere, 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...

preparation example 3

[0098] (1) under the protection of nitrogen atmosphere, 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 catalyst and 204 parts are added in the reaction kettle, 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 w...

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Abstract

The invention relates to the field of pencils, and particularly discloses photochromic pencil paint and a process for producing a photochromic pencil by applying the same. The photochromic pencil paint is prepared from the following specific raw materials: gloss paint, photochromic powder, a mixed solvent, a hyperdispersant and an auxiliary agent, wherein the hyperdispersant is prepared from the following raw materials: n-heptanoic acid, propylene glycol, phthalic anhydride, a catalyst, toluene diisocynate, dimethylbenzene and N, N-dimethylaminopropylamine. The process for producing a photochromic pencil by using the photochromic pencil paint comprises the following steps of: sequentially suction-coating the surface of a wooden pencil with a primer, a finish paint and a gloss paint by adopting a rubber ring extrusion suction-coating method, and carrying out natural airing after each low-temperature drying; then, sequentially and evenly distributing contrast paint and the photochromic pencil paint on the surface of the wooden pencil in a dipping mode; and finally, dipping the top end of the wooden pencil with finish paint, and drying at low temperature. The photochromic pencil paint can be used for preparing high-specification 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 Applications(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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