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Method for preparing radiation and aging resistant polypropylene alloys

A polypropylene, radiation-resistant technology, applied in organic chemistry and other directions, can solve the problems of discoloration and mechanical properties decline, and achieve the effects of simple preparation method, reduced elongation at break, and easy large-scale continuous production

Active Publication Date: 2011-05-25
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to improve the radiation stability of polypropylene alloys and overcome the problems of decreased mechanical properties, discoloration and degradation during storage after radiation sterilization, the purpose of the present invention is to provide a method for preparing radiation-resistant aging polypropylene alloys , grafting reactive hindered amine stabilizers on polypropylene by reactive extrusion, and then melt-blending them with thermoplastic elastomers to prepare polypropylene alloys resistant to radiation aging

Method used

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  • Method for preparing radiation and aging resistant polypropylene alloys
  • Method for preparing radiation and aging resistant polypropylene alloys
  • Method for preparing radiation and aging resistant polypropylene alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 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

[0031] 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

[0033] An electron accelerator was used to pre-irradiate homopolypropylene (iPP), and the irradiation dose was listed in Table 1 to prepare pre-irradiated polypropylene with macromolecular peroxides.

[0034] Homopolypropylene, ethylene-propylene random copolymer or their blends, TPM, MPM or their mixtures, and pre-irradiated polypropylene are subjected to reactive extrusion grafting to prepare a radiation-resistant 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 melt flow rate of the homopolypropylene used is 2.0g / 10min, and the melt flow rate of the ethylene-propylene random copolymer used is 3.0g / 10min. in Table 2.

[0035] The prepared polypropylene resin grafted with a hindered amine stabilizer is mechanically mixed with a thermoplastic elastomer, and added to a twin-screw extruder f...

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Abstract

The invention provides a method for preparing radiation and aging resistant polypropylene alloys. 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 alloys are subjected to radiation sterilization. The radiation and aging resistant polypropylene alloys prepared by a reactive grafting method have the advantages of uniform dispersion of the stabilizers, difficult precipitation, durable aging resistance and the like. The radiation and aging resistant polypropylene alloys have simple preparation method, have no pollution to the environment, and are easy to realize mass continuous production. The radiation and aging resistant polypropylene alloys 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 ofstorage 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 and aging resistant polypropylenes have strong radiation and aging resistance.

Description

technical field [0001] The invention relates to a method for preparing an anti-radiation aging polypropylene alloy. Background technique [0002] Polypropylene alloy has both the high strength of polypropylene and the low temperature toughness of ordinary copolymers, and is widely used in medical equipment, pharmaceutical packaging and other fields. However, polypropylene alloys have poor radiation resistance, and after irradiation sterilization, mechanical properties will decline and discoloration will occur. And as the storage time increases, the degradation of polypropylene alloy will continue to develop, and even lose its use value. This greatly limits the use of efficient, rapid and environmentally friendly irradiation sterilization methods for medical polypropylene alloys. [0003] At present, improving the radiation aging resistance of polypropylene is mainly achieved by adding various stabilizers to polypropylene. Patent US 4666959 discloses that adding hindered a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/28C08L23/16C07D211/46C08L53/00C08L23/08C08L51/06
Inventor 李敏殷敬华栾世方
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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