Low-precipitation polypropylene resin for injection, stretching and bottle blowing

A polypropylene resin, injection stretch blowing technology, applied in the field of polypropylene resin, low precipitation injection stretch blowing polypropylene resin, can solve the problems of increased risk of food hygiene safety, sensitivity to precipitates, etc., to meet the requirements of food hygiene and safety Requirements, the effect of less n-hexane extract

Pending Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For hot-fill bottles, it needs to be hot-filled at a high temperature of 80°C to 90°C, and after hot-filling, it needs to be sprayed and sterilized at 90°C for about 15 minutes. This process is conducive to random and low-order High degree of polymer precipitation, so it is more sensitive to precipitates, and the risk of food hygiene and safety increases

Method used

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  • Low-precipitation polypropylene resin for injection, stretching and bottle blowing
  • Low-precipitation polypropylene resin for injection, stretching and bottle blowing
  • Low-precipitation polypropylene resin for injection, stretching and bottle blowing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0020] The characteristics of the propylene / 1-butene random copolymerized polypropylene resin used in the examples are shown in Table 1, and the melt flow rate is 8-12 g / 10 min.

[0021] Embodiment Antioxidant adopts 1,3,5-trimethyl-2,4,6-three (3,5-di-tert-butyl-4 hydroxybenzyl) benzene and three (2,4-di-tert-butyl A mixture of phenyl)phosphites, the ratio of the two is 1:2; the nucleating agent is 2,2'-methylene-bis(4,6-di-tert-butylphenyl)sodium phosphate; acid neutralization The agent is calcium stearate. The ratio of polypropylene resin base material to antioxidant, nucleating agent and acid neutralizer is 100:0.12:0.05:0.05.

[0022] In the examples, the propylene / 1-butene random copolymerized polypropylene resin base material is mixed with additives such as antioxidants, nucleating agents, and acid neutralizers, and granulated by melt extrusion to prepare propylene / 1- Butene random copolymerization polypropylene resin.

Embodiment 4

[0025] The melt flow rate of the propylene / 1-butene random copolymerized polypropylene resin used is 3.0g / 10min, and the antioxidant is 1,3,5-trimethyl-2,4,6-tri(3,5-di A mixture of tert-butyl-4-hydroxybenzyl)benzene and tris(2,4-di-tert-butylphenyl)phosphite, the ratio of the two is 1:0.3; the nucleating agent is 2,2'-methylene Base-sodium bis(4,6-di-tert-butylphenyl)phosphate; acid neutralizer is calcium stearate. The ratio of polypropylene resin base material to antioxidant, nucleating agent and acid neutralizer is 100:0.03:0.02:0.02. The steps for preparing the propylene / 1-butene random copolymerized polypropylene resin are the same as in Example 1. The n-hexane extract of the resulting resin was 1.03%.

Embodiment 5

[0027] The melt flow rate of the propylene / 1-butene random copolymerized polypropylene resin used is 20.0g / 10min, and the antioxidant is 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylbenzene base) butane and tris(2,4-di-tert-butylphenyl)phosphite, the ratio of the two is 1:6; the nucleating agent is 2,2′-methylene-bis(4, 6-di-tert-butylphenyl) sodium phosphate; acid neutralizer is hydrogenated talc. The ratio of polypropylene resin base material to antioxidant, nucleating agent and acid neutralizer is 100:0.25:0.15:0.10. The steps for preparing the propylene / 1-butene random copolymerized polypropylene resin are the same as in Example 1. The n-hexane extract of the resulting resin was 1.09%.

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Abstract

The invention provides a low-precipitation polypropylene resin for injection, stretching and bottle blowing. The low-precipitation polypropylene resin for injection, stretching and bottle blowing comprises a polypropylene resin base material, an antioxidant, a nucleating agent and an acid neutralizer, wherein the polypropylene resin base material is propylene / 1-butene random copolymer polypropylene, the butene content is 1-9mol%, the melting temperature is 142-164DEG C, and the melt flow rate is 3.0-20.0g / 10min. Compared with an existing ethylene / propylene random copolymer polypropylene, the propylene / 1-butene random copolymer polypropylene obtained by the invention has the advantages of strong crystallization capacity, and especially a low-regularity resin part has strong crystallizationcapacity, so that the low-regularity resin part is not easy to separate out in n-hexane due to crystallization, the n-hexane extract is significantly reduced, and the food hygiene and safety requirements of injection-stretch-blow hot filling bottles are met.

Description

Technical field [0001] The invention belongs to the technical field of polymer materials and relates to a polypropylene resin, and in particular to a polypropylene resin for injection stretch blow molding with low precipitation. Background technique [0002] After years of rapid development in China's beverage industry, bottled beverages have grown at a double-digit average annual growth rate. Polypropylene bottles have developed rapidly in hot-fill packaging due to their high temperature resistance. Polypropylene containers can be produced by injection stretch blow molding, injection molding, extrusion molding, etc. Injection stretch-blown polypropylene bottles have a bidirectional stretching process, which causes the stretching orientation of molecules and has a greater impact on the crystallization rate and crystal morphology. Compared with the other two types of molded containers, it has a higher melting point and crystallization High temperature, better transparency, h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08K5/13C08K5/526C08K5/5333C08K5/098C08K5/00
CPCC08K5/13C08K5/526C08K5/5333C08K5/098C08K5/00C08L2203/10C08L23/14
Inventor 陶红周浩翁向斌张锋袁松柏胡雄王新华陆慧贤
Owner CHINA PETROLEUM & CHEM CORP
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