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Ultraviolet light absorber, and preparation method and composition thereof

An absorbent, ultraviolet technology, applied in the field of ultraviolet absorption, can solve the problem of limiting the application of heat-sensitive substrates, and achieve excellent intramolecular electron and charge transport properties and stable effects.

Active Publication Date: 2021-01-15
JINLING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these UV absorbers are rich in hydrogen bonds and rely on intramolecular proton transfer to convert UV rays into heat release or harmless low-energy radiation, which limits their application on heat-sensitive substrates.

Method used

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  • Ultraviolet light absorber, and preparation method and composition thereof
  • Ultraviolet light absorber, and preparation method and composition thereof

Examples

Experimental program
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Effect test

Synthetic example 1

[0033] Step 1, preparation of aromatic ether

[0034] In a three-necked flask, mix 50ml of 2,5-dichlorophenol with 100ml of n-butyl chloride, keep the temperature under the action of ferric chloride acid as a catalyst, stir and react for 2 hours, and then obtain colorless transparent aromatic ether;

[0035] Step 2, preparation of 1,4-dilithium diacetylene

[0036] In a three-necked flask, mix 50ml of n-butyllithium and 80ml of tetrahydrofuran, and then add dropwise to the mixed solution of 80ml of tetrahydrofuran and 8ml of tetrahydrofuran hexachlorobutadiene under nitrogen protection, and dropwise add it into the three-necked flask to stir the reaction , after the dropwise addition was completed, the temperature was gradually increased to 5°C, and the stirring reaction was continued for 8 hours to obtain a gray-white turbidity to obtain a 1,4-dilithium diacetylene solution;

[0037] Step 3, preparation of butadiynyl polyaryl hydrocarbon alkyl

[0038] In the three-necked ...

Synthetic example 2

[0043] Step 1, preparation of aromatic ether

[0044] In a three-necked flask, mix 50ml of 2,5-dichlorophenol and 120ml of chlorobenzene chloride, keep the temperature under the action of Lewis acid as a catalyst, stir and react for 2 hours, and then obtain a colorless and transparent aromatic ether by fractional distillation ;

[0045]Step 2, preparation of 1,4-dilithium diacetylene

[0046] In a three-necked flask, mix 50ml of n-butyllithium and 80ml of tetrahydrofuran, and then add dropwise to the mixed solution of 80ml of tetrahydrofuran and 8ml of tetrahydrofuran hexachlorobutadiene under nitrogen protection, and dropwise add it into the three-necked flask to stir the reaction , after the dropwise addition was completed, the temperature was gradually increased to 5°C, and the stirring reaction was continued for 8 hours to obtain a gray-white turbidity to obtain a 1,4-dilithium diacetylene solution;

[0047] Step 3, preparation of butadiynyl polyaryl hydrocarbon alkyl

...

Synthetic example 3

[0053] Step 1, preparation of aromatic ether

[0054] In a three-necked flask, mix 50ml of 2,5-dichlorophenol with 125ml of chlorotoluene, keep the temperature under the action of Lewis acid as a catalyst, stir and react for 2 hours, and then obtain a colorless and transparent aromatic ether by fractional distillation;

[0055] Step 2, preparation of 1,4-dilithium diacetylene

[0056] In a three-necked flask, mix 50ml of n-butyllithium and 80ml of tetrahydrofuran, and then add dropwise to the mixed solution of 80ml of tetrahydrofuran and 8ml of tetrahydrofuran hexachlorobutadiene under nitrogen protection, and dropwise add it into the three-necked flask to stir the reaction , after the dropwise addition was completed, the temperature was gradually increased to 5°C, and the stirring reaction was continued for 8 hours to obtain a gray-white turbidity to obtain a 1,4-dilithium diacetylene solution;

[0057] Step 3, preparation of butadiynyl polyaryl hydrocarbon alkyl

[0058] I...

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Abstract

The invention discloses an ultraviolet light absorber, and a preparation method and a composition thereof, which belong to the field of ultraviolet light absorption. The preparation method comprises the following steps of reacting a 1, 4-dilithium-based butadiyne solution with aromatic ether to obtain a butadiyne-based polyaromatic hydrocarbon alkyl compound. According to the butadiyne-based polyaromatic hydrocarbon alkyl compound, conjugated polyacetylene molecules are used as a main chain, and a conjugated polyacetylene structure has a one-dimensional carbon chain structure formed by singlebonds and triple bonds alternately, so that cylindrical electron delocalization is formed, the butadiyne-based polyaromatic hydrocarbon alkyl compound has excellent intramolecular electron and chargetransport properties, and the ultraviolet absorption wavelength of the compound can be subjected to red shift; oxygen atoms rich in electrons are introduced to the ortho-position of a benzene ring andstabilized through alkyl or alkylene or aromatic hydrocarbon, the optimal reaction condition is explored, and the ultraviolet light absorber with the stable effect can be obtained.

Description

technical field [0001] The invention belongs to the field of ultraviolet absorption, in particular to an ultraviolet absorber, its preparation method and composition. Background technique [0002] There is an increasing demand for products related to UV absorbers. Sustainability, low cost, environmental friendliness, safety, health, etc. are all issues that require great attention. [0003] Ultraviolet absorbers in the prior art include inorganic ultraviolet absorbers and organic ultraviolet absorbers, wherein organic ultraviolet absorbers are mainly composed of π-conjugated systems in molecules, and utilize their specific structures to absorb ultraviolet rays to make themselves into an excited state, and Release the absorbed energy as thermal energy or harmless low-energy radiation, or undergo intramolecular tautomerization, consume part of the energy, return to the ground state, and absorb ultraviolet rays repeatedly, thereby protecting the substance. However, these UV a...

Claims

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Application Information

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IPC IPC(8): C08G61/02C09D175/14C09D133/04C09D5/32
CPCC08G61/02C09D175/14C09D133/04C09D5/32C08G2261/124C08G2261/1424C08G2261/18C08G2261/312C08G2261/3328C08L2201/10C08L65/00
Inventor 杨晓莉
Owner JINLING INST OF TECH
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