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Method for preparing radiation aging resistant polypropylenes

An anti-radiation, polypropylene technology, applied in the direction of organic chemistry, can solve the problems of easy volatilization and precipitation environment, uneven dispersion of stabilizers, difficult processing, etc. Precipitation effect

Active Publication Date: 2011-09-14
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to improve the anti-radiation aging performance of polypropylene and overcome the problems of uneven dispersion, easy volatilization and precipitation of stabilizers in the physical blending method and serious environmental pollution and difficult processing in the solution grafting method, the present invention provides a A method for preparing anti-radiation aging polypropylene resin, that is, using an acid anhydride esterification reaction to prepare a reactive hindered amine stabilizer, and grafting it to the polypropylene molecular chain to prepare an anti-radiation aging polypropylene resin

Method used

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  • Method for preparing radiation aging resistant polypropylenes
  • Method for preparing radiation aging resistant polypropylenes
  • Method for preparing radiation aging resistant polypropylenes

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Add 0.12 mol of maleic anhydride, 0.1 mol of 2,2,6,6-tetramethyl-4-piperidinol and 60 ml of toluene into a three-necked flask equipped with a stirrer and a thermometer, and stir mechanically to make it evenly mixed . The temperature was raised to 50° C. for the esterification reaction, and the reaction was completed after stirring at this temperature for 30 minutes. Pour the reactant into a mixture of chloroform and saturated saline, the volume ratio of chloroform to saturated saline is 3:1, then move the chloroform and saturated saline solution containing the reactant to a separatory funnel for shaking to separate layers, Unreacted maleic anhydride was removed. Chloroform and toluene were distilled off from the lower layer under reduced pressure accordingly. The white solid obtained was mono(2,2,6,6-tetramethyl-4-piperidinolyl)maleate (TPM).

Embodiment 2

[0028] Add 0.15mol of maleic anhydride, 0.1mol of 1,2,2,6,6-pentamethyl-4-piperidinol and 80ml of xylene into a three-necked flask equipped with a stirrer and a thermometer, and stir mechanically to make it well mixed. The temperature was raised to 60° C. for the esterification reaction, and the reaction was completed after stirring at this temperature for 60 minutes. Pour the reactant into a mixture of chloroform and saturated saline, the volume ratio of chloroform to saturated saline is 2.5:1, then move the chloroform and saturated saline solution containing the reactant to a separatory funnel for shaking to separate layers, Unreacted maleic anhydride was removed. Chloroform and xylene were distilled off from the lower layer under reduced pressure accordingly. The white solid obtained was mono(1,2,2,6,6-pentamethyl-4-piperidinolyl)maleate (MPM).

Embodiment 3-6

[0030] The electron accelerator was used to pre-irradiate homopolypropylene, and the irradiation dose was listed in Table 1 to prepare pre-irradiated polypropylene with macromolecular peroxide.

[0031] One or both of homopolypropylene and ethylene-propylene random copolymer, reactive hindered amine stabilizer mono(2,2,6,6-tetramethyl-4-piperidinyl) cis-butyl One or both of alkene ester (TPM), mono(1,2,2,6,6-pentamethyl-4-piperidinyl) maleate (MPM), pre-radiation Adding polypropylene into a twin-screw extruder to graft the reactive hindered amine stabilizer onto the molecular chain of polypropylene to prepare the anti-radiation aging polypropylene resin. The reaction extrusion grafting temperature is 200° C., the screw speed is 80 rpm, and the material residence time is 3 minutes. The ratio of anti-radiation aging polypropylene material is shown in Table 1. The iPP used had a melt index of 2.0 g / 10 min and the cPP used had a melt index of 3.0 g / 10 min. An electron accelerat...

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Abstract

The invention discloses a method for preparing radiation aging resistant polypropylenes. Reactive hindered amine stabilizers are grafted on a polypropylene molecular chain by a reactive extrusion method to improve the aging resistance of materials after the polypropylenes are subjected to radiation treatment. Compared with radiation aging resistant polypropylenes prepared by the prior physical blending method, the radiation aging resistant polypropylenes have the advantages of uniform dispersion of the stabilizers, difficult precipitation, durable aging resistance and the like. The radiation aging resistant polypropylenes have the simple preparation method, have no pollution to the environment, and are easy to realize mass continuous production. The radiation aging resistant polypropylenes prepared by the method can be applied in fields such as medical infusion instruments, food packaging, medicament packaging and the like; and after a radiation sterilization method is adopted for sterilization and within one year of storage period, the elongation at break of products is reduced and is less than 50 percent, the tensile strength is reduced and is less than 2MPa, and the yellowness index is increased and is less than 1. Therefore, the radiation aging resistant polypropylenes have strong radiation aging resistance.

Description

technical field [0001] The invention relates to a preparation method of anti-radiation aging polypropylene. Background technique [0002] Polypropylene resin has the advantages of good comprehensive physical and mechanical properties, non-toxicity, chemical corrosion resistance, easy processing, and low price, and is widely used in the fields of medicine and food packaging. However, the anti-radiation aging performance of polypropylene is poor, and it will degrade at a lower radiation dose, making the product brittle and yellow. With the prolongation of storage time, the degradation of polypropylene will continue to develop until it loses its use value. [0003] The traditional solution is to add stabilizers to polypropylene to improve the anti-radiation aging performance of polypropylene. Patent US 4666959 discloses that adding hindered amine light stabilizer, phosphite and hindered phenol antioxidant to polypropylene improves the radiation resistance of polypropylene. P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L51/06C08L23/12C08L23/16C07D211/46C08J3/28
Inventor 李敏殷敬华栾世方
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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