A kind of preparation method of polymerized ultraviolet light absorber

A technology of polymerization and ultraviolet light, applied in the direction of coating, etc., can solve the problems of content reduction, cumbersome process operation, low grafting rate, etc., and achieve the effect of reducing usage and cost

Active Publication Date: 2022-06-28
DONGLAI COATING TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, UV-0 was used to react with acryloyl chloride, and then grafted with water-soluble polymer chains in two steps to realize the water-based of this additive. However, the process is cumbersome and the grafting rate is still not high. Due to the use of Two-step grafting, resulting in a reduced amount of actual UV absorbing groups in the bulk additive

Method used

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  • A kind of preparation method of polymerized ultraviolet light absorber
  • A kind of preparation method of polymerized ultraviolet light absorber
  • A kind of preparation method of polymerized ultraviolet light absorber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of a polymerized ultraviolet light absorber, the method comprises the following steps:

[0029] (1) 214g (1.0mol) of UV-0 (2,4-dihydroxybenzophenone), a small molecule ultraviolet light absorber, was placed in a glass flask, 5g of p-toluenesulfonic acid was added, 250g of ethyl acetate was added, and the mixture was stirred. Make it completely dissolved and add 98g (1.0mol) maleic anhydride while stirring, heat to 80°C, react under stirring, and check the pH to 6-8 (drop the reaction on a pH test paper wetted with water to test), It can be judged that the reaction is complete, and the temperature is cooled down to form a reaction solution of the polymerized monomer M with ultraviolet light absorption function;

[0030] (2) Add 104g (1.0mol) of styrene monomer to the above reaction system, add 15g AIBN (azobisisobutyronitrile), stir to dissolve, slowly heat up to 80°C, and react for 6h under continuous stirring. Form a polymerized UV absorber. Cool...

Embodiment 2

[0032] A preparation method of a polymerized ultraviolet light absorber, the method comprises the following steps:

[0033] (1) 214g (1.0mol) of UV-0 (2,4-dihydroxybenzophenone), a small molecule ultraviolet light absorber, was placed in a glass flask, 5g of p-toluenesulfonic acid was added, 250g of ethyl acetate was added, and the mixture was stirred. Make it dissolve completely and add 98g (1.0mol) maleic anhydride while stirring, heat to 110°C, react under stirring, and check the pH to 6-8 (drop the reaction on a pH test paper wetted with water to test), It can be judged that the reaction is complete, and the temperature is cooled down to form a reaction solution of the polymerized monomer M with ultraviolet light absorption function;

[0034] (2) Add 43 g (0.5 mol) of acrylic monomer, 50 g (0.5 mol) of methyl methacrylate to the above reaction system, add 15 g of BPO (benzoyl peroxide), stir to dissolve, and slowly heat up to 110 ° C , and react for 4h under continuous st...

Embodiment 3

[0037] A preparation method of a polymerized ultraviolet light absorber, the method comprises the following steps:

[0038] (1) 214g (1.0mol) of UV-0 (2,4-dihydroxybenzophenone), a small molecule ultraviolet light absorber, was placed in a glass flask, 5g of p-toluenesulfonic acid was added, 250g of ethyl acetate was added, and the mixture was stirred. Make it dissolved completely, add 98g (1.0mol) maleic anhydride while stirring, heat to 100°C, and under stirring, check the pH to 6-8 (drop the reaction on a pH test paper wetted with water to test), namely It can be judged that the reaction is complete, the temperature is cooled, and vacuum dried, that is, the polymerized monomer M with ultraviolet light absorption function is formed;

[0039] (2) 500g of water was added to the mixture to which 104g (1.0mol) of polymerized monomer M, 56.8g (0.8mol) of acrylamide and 200g (0.2mol) of allyl polyethylene glycol (molecular weight 1000) had been added. 20g AIBA (azodiisobutylamidi...

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Abstract

The present invention relates to a kind of preparation method of macromolecule ultraviolet light absorber, and this method comprises the following steps: (1) make small molecular ultraviolet light absorber UV-0, under the condition of catalyst and heating, make it and maleic anhydride Esterification reaction is carried out to form polymerized monomer M with ultraviolet light absorbing function; (2) Free radical copolymerization of monomer M and comonomer is initiated by an initiator to form polymerized ultraviolet light absorber. Compared with the prior art, the invention is less volatile, easy to decompose, less toxic, and has good ultraviolet shielding effect.

Description

technical field [0001] The invention relates to the field of coating additives, in particular to a preparation method of a polymerized ultraviolet light absorber. Background technique [0002] Sunlight contains a large amount of ultraviolet light that is harmful to color bodies, and its wavelength range is about 290-460 nm. These ultraviolet light decompose and fade color molecules through redox action. In addition, when the polymer material is used outdoors, it will be degraded by ultraviolet (UV), yellowing, gloss reduction, embrittlement, cracking and other phenomena will occur, and the physical and mechanical properties will also be significantly reduced. [0003] Ultraviolet absorbers have a good absorption effect on ultraviolet light, which can effectively reduce the damage of ultraviolet light to color bodies, thereby protecting the color from changing. And can fully play the polymer function, prolong product life. Commonly used UV absorbers include salicylates, ben...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F222/20C08F212/08C08F220/06C08F220/14C08F283/06C08F220/56C09D7/65C09D133/00
CPCC08F222/205C08F212/08C08F283/065C09D133/00C09D7/65C08L2201/08C08L2205/025C08L2205/03C08F220/06C08F220/14C08F220/56C08L33/00C08L35/06C08L35/02C08L51/08
Inventor 朱忠敏何刚叶小明
Owner DONGLAI COATING TECH SHANGHAI
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