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Preparation method of macromolecule ultraviolet radiation absorbent

A polymerization and ultraviolet technology, which is applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of easy migration and loss, improve the resistance to ultraviolet light aging, the preparation method is simple and feasible, and the post-processing is simple. Effect

Inactive Publication Date: 2008-01-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Among the existing light stabilizers, there are compatibility problems between inorganic light stabilizers and polymer materials, and the final effect depends on the type of additive, particle size and distribution in polymer materials; organic light stabilizers are mostly small Molecular additives, although they generally have good compatibility with polymer materials, they are prone to migration loss during use

Method used

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  • Preparation method of macromolecule ultraviolet radiation absorbent
  • Preparation method of macromolecule ultraviolet radiation absorbent

Examples

Experimental program
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Effect test

Embodiment 1

[0032] First, weigh 20 parts of MMA, 80 parts of xylene, 0.1 part of AIBN, 0.05 part of CuBr by weight 2and 0.1 part of TMEDA, all added into a sealed reaction bottle, stirred at room temperature for 1 hour, then passed high-purity argon, vacuumed, and evacuated repeatedly three times, put it in a water bath at 80°C for 3 hours, stopped the reaction, and precipitated and purified , drying to obtain macromolecules. The obtained polymer product is dissolved in a good solvent, configured into a dilute solution, and refluxed with an equimolar ratio of 2,4-dihydroxybenzophenone (UV-0) small-molecule ultraviolet absorber under the catalytic action of a catalyst After 30 hours, a polymerized ultraviolet absorber with a narrow molecular weight distribution can be prepared.

Embodiment 2

[0034] First, weigh 30 parts of MBA, 70 parts of toluene, 0.15 parts of BPO, 0.075 parts of CuCl 2 and 0.15 parts of bpy, all added into a sealed reaction bottle, stirred at room temperature for 3 hours, then passed high-purity argon, evacuated, and repeatedly evacuated three times, put it in a 90°C water bath for 4 hours to stop the reaction, and precipitated and purified , drying to obtain macromolecules. Dissolve the obtained macromolecule product in a good solvent, configure it into a dilute solution, and react with 2,4-dihydroxybenzophenone (UV-0) small-molecule ultraviolet absorber in an equimolar ratio under the catalysis of the catalyst After 50 hours, a polymerized ultraviolet absorber with a narrow molecular weight distribution can be prepared.

Embodiment 3

[0036] First, weigh 40 parts of St, 60 parts of xylene, 0.2 part of benzyl bromide, 0.1 part of CuBr and 0.2 part of dNbpy in parts by weight, add them all into a sealed reaction bottle, stir at room temperature for 5 hours, and then pass high-purity argon to pump Vacuum, repeated evacuation three times, put into 110 ℃ water bath to react for 5 hours and then stop the reaction, after precipitation, purification and drying, the polymer was obtained. The obtained polymer product is dissolved in a good solvent, configured into a dilute solution, and refluxed with an equimolar ratio of 2,4-dihydroxybenzophenone (UV-0) small-molecule ultraviolet absorber under the catalytic action of a catalyst After 70 hours, a polymerized ultraviolet absorber with a narrow molecular weight distribution can be prepared.

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PUM

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Abstract

The invention discloses a method for preparing a high polymer ultraviolet absorbent, which is characterized by the following: preparing the dilute solution by dissolving narrow distribution (D<1.2)high polymer by (reverse direction)atom transferring free radical polymerization(ATRP)with the good solvent; proceeding with reflux reaction with 2, 4-dihydroxy benzophenone (UV-0)low molecule ultraviolet absorbent with equimolar ratio in the accelerant function for 30-70 hours; preparing narrow distribution high polymer ultraviolet absorbent. Nuclear magnetism result show that the method make the grafting ratio of UV-0 low molecule ultraviolet absorbent which is grafted by PMMA reach 25.4%; the molecular weight of PMMA film without high polymer ultraviolet absorbent reduces 32.7% after the same molecular weight PMMA and PMMA which is grafted by UV-0 low molecule ultraviolet absorbent are aged 740 hours quickly by the ultraviolet light, the distribution of the molecular weight changes from 1.17 to 1.42; the molecular weight of PMMA film with 27% high polymer ultraviolet absorbent reduces 6.7%, the distribution of the molecular weight changes from 1.17 to 1.23, so the test result shows that high polymer ultraviolet absorbent prepared with the method can improve the ultra-violet resistance property of the high polymer material.

Description

1. Technical field [0001] The invention relates to a polymerized preparation method of an ultraviolet absorber, which belongs to the field of polymer material modification. 2. Background technology [0002] The wavelength range of sunlight reaching the ground is from the infrared region (3000-700nm), to the visible region (700-400nm), and then to the ultraviolet region (400-190nm). Due to the absorption of the ozone layer, it is difficult for ultraviolet rays less than 290nm to reach the ground. However, in the last 30 years, due to the destruction of the ozone layer due to the environmental pollution caused by humans, ultraviolet rays less than 290nm can also reach the ground, which causes an increase in the solar energy reaching the ground. Although the ultraviolet spectral region (290-400nm) contains less than 5% of the sunlight energy, the sunlight in this wavelength range has enough energy to destroy the chemical bonds in organic matter. The energy range of 700-300nm ...

Claims

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Application Information

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IPC IPC(8): C08F120/14C08F8/00C09K3/00
Inventor 潘凯淡宜赵义杨明娇江龙
Owner SICHUAN UNIV
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