Controllable molecular weight benzotriazole styrene copolymer and its preparation method and application

A technology of benzotriazole styrene and benzotriazole, which is applied in the field of additives for polymer material products, can solve the problems of troublesome control of product molecular weight, difficult control of reaction conditions, and lack of molecular weight, and achieves light stabilization effect. Sustained Effectiveness, Long-lasting Light Stabilization, Simple Operation

Active Publication Date: 2018-12-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional free radical polymerization is troublesome to control the molecular weight of the product, and the reaction conditions of the polymerization are not easy to control, especially how to change the reaction conditions to obtain a polymer with a predictable molecular weight, often cannot obtain the pre-designed molecular weight, and the molecular weight distribution of the product Wider, if the molecular weight distribution of the light stabilizer is wider, the low molecular weight part is volatile and easy to extract; while the high molecular weight part is difficult to diffuse in the polymer, which is not conducive to its function

Method used

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  • Controllable molecular weight benzotriazole styrene copolymer and its preparation method and application
  • Controllable molecular weight benzotriazole styrene copolymer and its preparation method and application
  • Controllable molecular weight benzotriazole styrene copolymer and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 2-(2'-propionyloxy-5'-methylphenyl)benzotriazole 3,36g, styrene 2.5g, azobisisobutyronitrile 0.021g, chain transfer agent S, S'- 1 / 3 of the total amount of bis(α,α'-methyl-α″-acetic acid) trithiocarbonate 0.353g is added to the reactor and dissolved in dioxane, fully stirred and dissolved at normal temperature; another 2 / 3 of the chain transfer agent total amount 0.353g in the container is dissolved in dioxane.

[0024] Add 10ml of dioxane, fully stir to dissolve; under the protection of nitrogen, increase the reaction temperature to 60°C, the first stage, start the initial reaction, time 1.0 hours; second stage temperature 70°C, drop the remaining 2 / 3 chain transfer agent solution in the reactor, continue to react, the reaction time is 2.0 hours, in the third stage, after the chain transfer agent is added dropwise, the temperature is raised to 90°C, and the reaction time is 2.5 hours.

[0025] After the reaction is completed, the product mixture is poured into methano...

Embodiment 2

[0028] 2-(2'-propionyloxy-5'-methylphenyl)benzotriazole 3,36g, styrene 2.5g, azobisisobutyronitrile 0.025g, chain transfer agent S, S'- Di(α,α′-methyl-α″-acetic acid) trithiocarbonate 0.212g, 1 / 3 of the total amount, was added to the reactor and dissolved in 10ml of dioxane, fully stirred and dissolved at room temperature; 2 / 3 of the chain transfer agent total amount 0.212g in another container is dissolved in dioxane.

[0029] Add 10ml of dioxane, fully stir to dissolve; under the protection of nitrogen, increase the reaction temperature to 50°C, the first stage, start the initial reaction, time 2.0 hours; second stage temperature 65°C, dropwise add the remaining 2 / 3 chain transfer agent solution in the reactor, continue to react, the reaction time is 4.0 hours, in the third stage, after the chain transfer agent is added dropwise, the temperature is raised to 90°C, and the reaction time is 6.0 hours.

[0030] After the reaction is completed, the product mixture is poured int...

Embodiment 3

[0032] 6.72g of 2-(2'-propionyloxy-5'-methylphenyl)benzotriazole, 1.25g of styrene, 0.025g of azobisisobutyronitrile, chain transfer agent S, S'-di (α, α'-methyl-α"-acetic acid) 1 / 3 of the total amount of 0.216g trithiocarbonate is added to the reactor and dissolved in 15ml of dioxane, fully stirred and dissolved at normal temperature; another 2 / 3 of the chain transfer agent total amount 0.216g in the container is dissolved in dioxane.

[0033] Under the protection of nitrogen, raise the reaction temperature to 50°C. In the first stage, the initial reaction starts for 0.5 hours; in the second stage, the temperature is 70°C, and the remaining 2 / 3 chain transfer agent solution is added dropwise to the reactor , continue the reaction, the reaction time is 3.0 hours, in the third stage, after the dropwise addition of the chain transfer agent is completed, the temperature is raised to 85° C., and the reaction time is 2.5 hours.

[0034]After the reaction is completed, the product ...

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Abstract

The invention discloses a molecular-weight-controllable benzotriazole styrol copolymer and a preparing method and application thereof. A reversible addition fragmentation chain transferring free radical polymerization method is adopted; and through control over the proportion of reaction raw materials including polymeric form benzotriazole, styrene, azodiisobutyronitrile and a chain transfer agent, control over reaction temperature and reaction time of all stages in all reaction stages and gradual addition of the amount of the chain transfer agent, the molecular-weight-controllable and narrow-range benzotriazole styrol copolymer is prepared. The molecular-weight-controllable and narrow-range benzotriazole styrol copolymer is used as a light stabilizer in a high polymer material, physical losses in the machining process and transfer volatilization in the using process can be effectively reduced, and the light stabilization effect can be continuous and effective for a long time.

Description

technical field [0001] The invention relates to the field of additives for polymer material products, more specifically to a light stabilizer benzotriazole styrene copolymer, and the invention also relates to a preparation method and application of a benzotriazole styrene copolymer . Background technique [0002] Polymer materials are affected by photooxidation during use, which will deteriorate the appearance and physical and mechanical properties of material products, and gradually lose their use value. Adding light stabilizers is one of the most convenient and effective ways to prevent photooxidation. There are many types of light stabilizers, among which, benzotriazole light stabilizers have become the most widely used light stabilizers because of their high-efficiency light stabilizing properties. The prerequisite for the matrix material to have light oxidation resistance during use is that the light stabilizer can exist in the matrix material stably for a long time. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/34C08F212/08C08F2/38C08L59/00C08L33/14
CPCC08F2/38C08F220/34C08F2438/03C08L59/00C08L2201/08C08F212/08C08L33/14
Inventor 任显诚刘长青
Owner SICHUAN UNIV
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