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Preparation method of polypropylene resin used for manufacturing medical infusion bottle by injection stretch blow moulding

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

Active Publication Date: 2013-04-10
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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  • Preparation method of polypropylene resin used for manufacturing medical infusion bottle by injection stretch blow moulding
  • Preparation method of polypropylene resin used for manufacturing medical infusion bottle by injection stretch blow moulding
  • Preparation method of polypropylene resin used for manufacturing medical infusion bottle by injection stretch blow moulding

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Embodiment 1～6

[0022] The polypropylene resin base material is uniformly mixed with the additives, and then melted and mixed for granulation to obtain a polypropylene resin product. The melting heating temperature is 200-230° C., and the melting heating time is 2-4 minutes.

[0023] The above-mentioned polypropylene resin base material is a random copolymer of propylene and ethylene, the ethylene content of which is 0.5-4wt%, the melting temperature is 140-165°C, and the melt flow rate is 7.0g / 10min;

[0024] Above-mentioned additive comprises acid absorbing agent, antioxidant A and antioxidant B, wherein:

[0025] The antioxidant A is 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane; the acid absorbing agent is calcium stearate and hydrogenated talc in the same weight portion.

[0026] The concrete antioxidant B of each embodiment is shown in Table 1, and the proportioning of each substance is shown in Table 1 and Table 2.

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Abstract

The invention relates to a preparation method of polypropylene resin used for manufacturing medical infusion bottle by injection stretch blow moulding, including that polypropylene resin matrix and additive are mixed and then melting, mixing and pelleting are carried out to obtain the polypropylene resin product. The resin matrix is propene ethane random copolymer, content of ethane is 0.5-4wt%, and melt flowing speed is 5.0-10.0g / 10min. The additive comprises acid acceptor, antioxidant A and antioxidant B; wherein the antioxidant A is 1, 1, 3-tri(2-methyl-4-hydroxy-5-tert-butyl phenyl) butane; and the antioxidant B is tri(2, 4-ditertiary butyl phenyl) phosphite ester or bis(2, 4-di-tert-butyl phenyl) pentaerythritol phosphite ester. The invention has the advantages that thermal degradation resistance of the manufactured resin is greatly improved, the rising trend of melt flowing speed of the resin is obviously retarded through a plurality of times of heating and melting, thus being more applicable to the injection stretch blow moulding bottle-making process.

Description

technical field [0001] The invention relates to a preparation method of polypropylene resin, in particular to a preparation method of 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/16C08K13/02C08K5/13C08K5/526B29B9/00
Inventor 郭晓军黄伟东周浩
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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