Preparation method of high-molecular ultraviolet light absorber

Abstract

The invention relates to a preparation method of a high-molecular ultraviolet light absorber. The preparation method comprises the following steps: (1) carrying out esterification reaction on a small-molecular ultraviolet light absorber UV-0 and maleic anhydride under the conditions of a catalyst and heating to form a polymerization monomer M with an ultraviolet light absorption function; and (2)carrying out free radical copolymerization on the monomer M and a comonomer under the initiation of an initiator to form the high-molecular ultraviolet absorber. Compared with the prior art, the high-molecular ultraviolet light absorber is not easy to volatilize, easy to decompose due to irritability, low in toxicity and good in 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 which is harmful to color bodies, and its wavelength range is about 290-460nm. These ultraviolet light decompose and fade color molecules through redox action. In addition, when polymer materials are used outdoors, they will suffer from degradation, yellowing, gloss reduction, embrittlement, cracking, etc. due to the action of ultraviolet (UV), and their physical and mechanical properties will also be significantly reduced.

[0003] Ultraviolet absorbers have a good absorption effect on ultraviolet light, and can effectively reduce the damage of ultraviolet light to colored bodies, thereby protecting the color from changing. And it can fully exert the polymer function and prolong the product life. Commonly used UV absorbers includ...

Examples

Embodiment 1

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

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

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

Embodiment 2

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

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

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

Embodiment 3

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

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

[0039] (2) Add 500g of water to the mixture of 104g (1.0mol) of polymerized monomer M, 56.8g (0.8mol) of acrylamide and 200g (0.2mol) of allyl polyethylene glycol (molecular weight 1000), and add 20g of AIBA (azobisisobutylamidine hydrochlor...

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 which is harmful to color bodies, and its wavelength range is about 290-460nm. These ultraviolet light decompose and fade color molecules through redox action. In addition, when polymer materials are used outdoors, they will suffer from degradation, yellowing, gloss reduction, embrittlement, cracking, etc. due to the action of ultraviolet (UV), and their physical and mechanical properties will also be significantly reduced.

[0003] Ultraviolet absorbers have a good absorption effect on ultraviolet light, and can effectively reduce the damage of ultraviolet light to colored bodies, thereby protecting the color from changing. And it can fully exert the polymer function and prolong the product life. Commonly used UV absorbers includ...

Examples

Embodiment 1

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

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

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

Embodiment 2

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

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

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

Embodiment 3

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

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

[0039] (2) Add 500g of water to the mixture of 104g (1.0mol) of polymerized monomer M, 56.8g (0.8mol) of acrylamide and 200g (0.2mol) of allyl polyethylene glycol (molecular weight 1000), and add 20g of AIBA (azobisisobutylamidine hydrochlor...

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