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
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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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