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Ultraviolet screening agent and preparation method and application thereof

A technology of ultraviolet rays and shielding agents, which is applied in the field of ultraviolet shielding agents and their preparation, can solve the problems of easy migration of light stabilizers, short service life, and high requirements on the thickness of plastic products, so as to reduce migration and precipitation, improve absorption and shielding efficiency, Anti-aging effect

Active Publication Date: 2021-02-19
广东省科学院生物与医学工程研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects and deficiencies of the existing light stabilizers, which are easy to migrate, have high requirements on the thickness of plastic products, and have short service life after being prepared into plastic products, and provide a new type of anti-migration, high ultraviolet shielding efficiency, and remarkable Ultraviolet shielding agent for improving light stability and service life of plastic products

Method used

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  • Ultraviolet screening agent and preparation method and application thereof
  • Ultraviolet screening agent and preparation method and application thereof
  • Ultraviolet screening agent and preparation method and application thereof

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Embodiment 1

[0040] Embodiment 1 A kind of ultraviolet shielding agent

[0041] The preparation method of described ultraviolet shielding agent comprises the following steps:

[0042] S1. Formation of micellar template: Take 0.33g of polyacrylic acid (molecular weight: 3000) and 0.2g of 3-hydroxyphenylbenzoate, add 50mL of absolute ethanol to ultrasonic vibration, mix well, and obtain template emulsion;

[0043] S2. Silicon source hydrolysis polymerization and template removal: Add tetraethyl orthosilicate solution (mixed solution of 2.5mL orthosilicate ethyl ester + 8mL dilute hydrochloric acid) dropwise to the template emulsion obtained in step S1, heat to 50°C, and stir for 3h After the reaction is complete, wash and filter the solid product with absolute ethanol to obtain hollow silica microspheres loaded with ultraviolet absorbers;

[0044] S3. Surface modification: 0.24g 2,4-dihydroxybenzophenone (UV0), 5g potassium carbonate and 0.25g (3-chloropropyl)trimethylsilane were added to 5...

Embodiment 2

[0046] Embodiment 2 A kind of ultraviolet shielding agent

[0047] The preparation method of described ultraviolet shielding agent comprises the following steps:

[0048] S1. Formation of micellar template: Take 0.33g of polyacrylic acid (molecular weight: 3000) and 0.2g of ethylhexyl methoxycinnamate, add 50mL of absolute ethanol to ultrasonic vibration, and mix well to obtain a template emulsion;

[0049] S2. Silicon source hydrolysis polymerization and template removal: Add tetraethyl orthosilicate solution (mixed solution of 2.5mL orthosilicate ethyl ester + 8mL dilute hydrochloric acid) dropwise to the template emulsion obtained in step S1, heat to 50°C, and stir for 3h After the reaction is complete, wash and filter the solid product with absolute ethanol to obtain hollow silica microspheres loaded with ultraviolet absorbers;

[0050] S3. Surface modification: 0.24g 2,4-dihydroxybenzophenone (UV0), 18g potassium carbonate and 0.25g (3-chloropropyl)trimethylsilane were a...

Embodiment 3

[0052] Embodiment 3 A kind of ultraviolet shielding agent

[0053] The preparation method of described ultraviolet shielding agent comprises the following steps:

[0054] S1. Formation of micelle template: Take 0.33g polyacrylic acid (molecular weight 3000), 4.4mL ammonia water (25%) and 0.25g ethylhexyl methoxycinnamate, add 50mL absolute ethanol to ultrasonic vibration, mix well, Get template emulsion;

[0055] S2. Silicon source hydrolysis polymerization and template removal: Add 2.5mL orthosilicate ethyl ester dropwise to the template emulsion obtained in step S1, heat to 70°C, stir and react for 3h, after the reaction is complete, wash with absolute ethanol, and filter out the solid product , to obtain hollow microspheres of silicon dioxide loaded with ultraviolet absorbers;

[0056] S3. Surface modification: Add 0.125g 2,4-dihydroxybenzophenone (UV0), 5g potassium carbonate and 0.125g (3-chloropropyl)trimethylsilane to 50mL n-hexane, and magnetically stir for 3h , tak...

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Abstract

The invention belongs to the technical field of ultraviolet screening agents, and particularly relates to an ultraviolet screening agent and a preparation method and application thereof. The ultraviolet screening agent takes the silicon dioxide hollow microspheres with multi-stage cage-shaped structures as carriers, and ultraviolet absorbents can be loaded inside and outside the carriers, so thaton one hand, the migration and precipitation of the ultraviolet absorbents can be remarkably reduced, and on the other hand, the contact time of ultraviolet rays and the ultraviolet absorbents loadedin the cavities can be prolonged; the absorption and shielding efficiency of ultraviolet rays is remarkably improved, the aging effect of the ultraviolet rays on a plastic matrix is inhibited, and thelight stability and the service life of a plastic product are remarkably improved; and the prepared plastic product has a transparent appearance, and is very suitable for plastic products with certain requirements on light transmittance.

Description

technical field [0001] The invention belongs to the technical field of ultraviolet shielding agents. More specifically, it relates to an ultraviolet shielding agent and its preparation method and application. Background technique [0002] During the outdoor use of plastic products, high-energy ultraviolet rays irradiate the plastic surface, causing superficial polymer crosslinking, which will affect the photochemical properties, biological properties and mechanical strength of plastic products, and then affect the service life and later recycling of plastic products. . Especially for transparent plastic film materials (thickness 10-150 μm) used outdoors, the entire substrate is equivalent to a shallow surface layer, and ultraviolet aging will cause comprehensive aging of the material, rapidly reducing its outdoor service life. Therefore, UV aging resistance has become an urgent technical problem to be solved in the production and development of plastic products for outdoor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/12C08K5/00C08L67/02C08L67/04C08J5/18
CPCC08K9/12C08K5/005C08J5/18C08J2367/02C08J2467/04
Inventor 孙晓燕谢东陈骏佳王珂刘海露
Owner 广东省科学院生物与医学工程研究所
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