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Polypropylene resin suitable for manufacturing medical infusion bottle by using injection stretch blow moulding process

A polypropylene resin, injection-stretch-blowing technology, applied in the field of polypropylene resin, can solve problems such as unsatisfactory anti-oxidation performance

Inactive Publication Date: 2010-06-09
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the general polypropylene resin raw materials used to manufacture medical infusion bottles usually do not carry out targeted adjustments to antioxidant additives due to changes in the manufacturing process, so when used in the injection stretch blowing process, the anti-oxidant additives appear. Defects of unsatisfactory oxygen performance

Method used

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Effect test

Embodiment 1～6

[0019] The polypropylene resin is a composition, and the components include a resin base material, an acid neutralizer and an antioxidant, and are formed by melting and mixing. The resin base material is a random copolymer of propylene and ethylene, and its ethylene content is 0.5-4 wt%. The melting temperature of the resin base material is 140-165° C., and the melt flow rate is 7.0 g / 10 min.

[0020] The acid neutralizer is calcium stearate and hydrogenated talcum powder in the same weight portion; the antioxidant is a mixture of hindered phenolic antioxidant A and phosphite antioxidant B, wherein antioxidant B is diphosphite Bis(2,4-di-tert-butylphenyl)pentaerythritol ester.

[0021] See Table 1 for the specific antioxidant A and the ratio of antioxidants A and B in each embodiment, and Table 2 for the ratio of the resin base material to the total amount of antioxidant and the total amount of acid neutralizer.

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Abstract

The invention relates to polypropylene resin which is suitable for manufacturing a medical infusion bottle by using an injection stretch blow moulding process. The polypropylene resin is a composition, comprises the following ingredients of resin base material, acid neutralizer and antioxidant and is formed by melting and mixing, wherein the resin base material is propylene and ethylene random copolymer with the fusion temperature of 140 to 165 DEG C and the melt flow rate of 5.0 to 10.0g / 10min; the antioxidant is a mixture of hindered phenol antioxidant and phosphite ester antioxidant, and the weight ratio of the former to the latter is 1: 0.2 to 10; wherein the hindered phenol antioxidant is selected from one of 1,3,5-trimethyl-2,4,6-tri(3,5-tertiary dibutyl-4 hydroxy benzyl) benzene, bi-(3,3-bi-(3-tertiary butyl-4-hydroxy phenyl)-butyrate) glycol ester or tetra(Beta-(3,5-tertiary dibutyl-4- hydroxy phenyl) propionic acid) pentaerythritol ester; and the phosphite ester antioxidant is diphosphorous acid bi(2,4-teritiary dibutyl) pentaerythritol ester.

Description

technical field [0001] The invention relates to a polypropylene resin, in particular to a polypropylene resin specially used for manufacturing medical infusion bottles. Background technique [0002] At present, the raw materials for the manufacture of plastic medical infusion bottles basically use special polypropylene resin, which is a propylene-ethylene random copolymer with an ethylene content of less than 10 wt%. In terms of properties such as heat resistance, strength, toughness and transparency, it has obvious advantages compared with high polymer materials such as polyvinyl chloride used in the early stage, typically as described in US Patent US5,286,540 and Chinese Patent Application 200410017402.9 of. On the other hand, the bottle-making process of medical infusion bottles is mostly changed from the direct extrusion blow process to the injection stretch blow process, that is, the raw materials are first made into preforms by injection molding, and then blow molded ...

Claims

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Application Information

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IPC IPC(8): C08L23/16C08K13/02C08K5/13C08K5/134C08K5/526B29B9/00
Inventor 陶红陈国康蒋忠辉
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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