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Polyvinyl phosphorus antioxidant and preparation method and application thereof

A polyvinyl phosphorus and antioxidant technology, applied in the field of polyvinyl phosphorus antioxidants and their preparation, can solve the problems of low migration and extraction resistance, low molecular weight of antioxidants, poor thermal stability, etc., and achieve enhanced Migration resistance, high oxidation resistance, good compatibility

Pending Publication Date: 2021-11-30
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low molecular weight of these antioxidants, their application is severely limited
In addition, most antioxidants have disadvantages such as poor volatility, poor thermal stability, low migration and extraction resistance, etc.

Method used

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  • Polyvinyl phosphorus antioxidant and preparation method and application thereof
  • Polyvinyl phosphorus antioxidant and preparation method and application thereof
  • Polyvinyl phosphorus antioxidant and preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0040]The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0041] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0043] In a 50ml flask, 1g of polyethylene-vinyl acetate copolymer shown in formula IV (EVA, VA-19%, wherein x is 434, y+z is 33, and the copolymer is terminated with a methyl group) is dissolved in 20mL In tetrahydrofuran, heat in an oil bath at a temperature of 90°C, and magnetically stir to fully dissolve it. After the polyethylene-vinyl acetate copolymer shown in formula IV is completely dissolved, add 10 mL of sodium hydroxide-absolute ethanol solution to react for 2 hours. The product was precipitated with a large amount of absolute ethanol, filtered, washed repeatedly with absolute ethanol, and vacuum-dried for 12 hours to obtain the side chain hydroxyl-containing polyethylene represented by formula II.

[0044]

[0045] The FTIR characterization result of polyethylene-vinyl acetate copolymer shown in formula IV is as follows figure 1 Shown, the FTIR characterization result of the side chain containing hydroxyl group shown in formula II is as follows figure 2 As sh...

Embodiment 2

[0047] Add 100mL of xylene solution to a 250ml two-necked flask, and 25ml (about 0.05mol) of PCl 3 (2mol / L dissolved in dichloromethane, Energy Sea) and 20.6g (about 0.1mol) 2,4-di-tert-butylphenol were added, and then 0.02gMgCl 2 , Bubble nitrogen, react at 0-20°C for 1 hour, then raise the temperature to 60°C, react for 24h, remove unreacted substances and their solvent by rotary evaporation, and prepare the compound represented by the intermediate formula III. Get 2g intermediate and dissolve in xylene solution, join in the two-necked flask, add the side chain hydroxyl-containing polyethylene shown in the formula II that 0.5g above-mentioned embodiment 1 prepares, add 0.02gMgCl 2 , bubble nitrogen, heat up to 120°C, react for 4h, precipitate the product with absolute ethanol, filter, wash repeatedly with absolute ethanol, and vacuum-dry at 50°C for 12h to obtain a polyvinyl phosphorus-containing antioxidant (wherein the grafting rate is 16.7% (according to Figure 4 The i...

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Abstract

The invention belongs to the technical field of antioxidants, and particularly relates to a polyvinyl phosphorus antioxidant and a preparation method and application thereof, and the antioxidant is a polymer formed by partially or completely substituting H on side chain hydroxyl of a repetitive unit as shown in a formula II by a unit as shown in a formula I. According to the antioxidant, a long-chain alkyl group is introduced into a polyethylene grafted phosphorus-containing antioxidant structure so that the molecular weight of the antioxidant can be greatly improved, the physical loss of the antioxidant in the processing process and the use process is effectively reduced, and the long-term antioxidant capacity and the migration resistance of the antioxidant are enhanced; according to the antioxidant, the service life of a high-molecular polymer and a product thereof can be greatly prolonged in the use or storage process, and the health threat to a human body caused by the use of the antioxidant is eliminated or reduced.

Description

technical field [0001] The invention belongs to the technical field of antioxidants, and in particular relates to a polyvinylphosphorus antioxidant and its preparation method and application. Background technique [0002] Polymers are subjected to heat and shear during processing and are exposed to oxygen, light, heat and water during their use. All of these factors lead to oxidative degradation of polymers, resulting in changes in their chemical, physical, mechanical and aesthetic properties. To avoid oxidative degradation of polymers, adding antioxidants is a common method. The actual antioxidant effect of antioxidants in the polymer matrix depends on two factors: ① the antioxidant capacity determined by the chemical structure of the antioxidant; ② the ability of the antioxidant to resist physical loss during use. The physical loss of antioxidants mainly includes volatilization, migration, and extraction from the polymer matrix by solvents during processing and use. Low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/40C08F210/02C08L23/12C08L23/26
CPCC08F8/40C08L23/12C08L2201/08C08F210/02C08L23/26
Inventor 李化毅张银李倩刘卫卫胡友良
Owner INST OF CHEM CHINESE ACAD OF SCI
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