Modified small hollow high-density polyethylene resin for blow molding and preparation method thereof

A high-density polyethylene and small hollow technology, which is applied in the field of modified high-density polyethylene resin for small hollow blow molding and its preparation, can solve problems such as failure of normal blow molding, sticking of parisons, difference in taste of drinks, etc.

Inactive Publication Date: 2021-01-29
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the outstanding problem of small hollow products is in the processability and sanitation of resin. Most enterprises need to mix and use resin with good fluidity to produce small hollow products, and small hollow products are used to hold dairy products and beverages. There are strict requirements on hygienic performance
Some users reported that after a period of time, the fruit milk bottle made of domestic small hollow special material has a certain difference in the taste of the drink.
In addition, some customers reported that the blown parisons would stick together due to static electricity, resulting in the failure of normal blow molding

Method used

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  • Modified small hollow high-density polyethylene resin for blow molding and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Add ethylene monomer, 1-hexene and EP30X chromium-based catalyst into the first reactor of the slurry double-loop tube, control the pressure of the reactor at 3.6MPa, and control the reaction temperature at 101°C to carry out the polymerization reaction;

[0038] 2) Add ethylene monomer, 1-hexene and the polymerization product of the first reactor into the second reactor of the slurry double-loop pipe. The pressure of the reactor is controlled at 3.5MPa, the reaction temperature is controlled at 100°C, and a small amount of hydrogen is added at the same time. Control the mass ratio of hydrogen to ethylene to 0.003:1, and continue the polymerization reaction; through polymerization, the melt index is 0.3g / 10min and the density is 0.955g / cm 3 The ethylene-1-hexene copolymer powder;

[0039] 3) Mix 100 parts of ethylene-1-hexene copolymer powder with 0.05 parts of main antioxidant 1076 or 3114, 0.1 part of auxiliary antioxidant 168 or 626, 0.15 parts of light stabilizer 6...

Embodiment 2

[0043] 1) Add ethylene monomer, 1-hexene and EP30X chromium-based catalyst into the first reactor of the slurry double-loop tube. The reactor pressure is controlled at 3.7MPa, and the reaction temperature is controlled at 102°C to carry out the polymerization reaction;

[0044] 2) Add ethylene monomer, 1-hexene and the polymerization product of the first reactor into the second reactor of the slurry double-loop pipe. The pressure of the reactor is controlled at 3.6MPa, the reaction temperature is controlled at 101°C, and a small amount of hydrogen is added at the same time. Control the mass ratio of hydrogen to ethylene to 0.005:1, and continue the polymerization reaction; through polymerization, the melt index is 0.55g / 10min and the density is 0.957g / cm 3 The ethylene-1-hexene copolymer powder;

[0045] 3) Combine 100 parts of ethylene-1-hexene copolymer powder with 0.06 parts of main antioxidant 1076 or 3114 of composite auxiliary agent, 0.12 part of auxiliary antioxidant 16...

Embodiment 3

[0049] 1) Add ethylene monomer, 1-hexene and EP30X chromium-based catalyst into the first reactor of the slurry double-loop tube. The reactor pressure is controlled at 3.8MPa, and the reaction temperature is controlled at 103°C to carry out the polymerization reaction;

[0050] 2) Add ethylene monomer, 1-hexene and the polymerization product of the first reactor into the second reactor of the slurry double-loop pipe. The pressure of the reactor is controlled at 3.7MPa, the reaction temperature is controlled at 102°C, and a small amount of hydrogen is added at the same time. Control the mass ratio of hydrogen to ethylene to 0.006:1, and continue the polymerization reaction; through polymerization, the melt index is 0.65g / 10min, and the density is 0.959g / cm 3 The ethylene-1-hexene copolymer powder;

[0051] 3) Mix 100 parts of ethylene-1-hexene copolymer powder with 0.07 parts of main antioxidant 1076 or 3114, 0.14 parts of auxiliary antioxidant 168 or 626, 0.17 parts of light s...

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Abstract

The invention discloses modified small hollow high-density polyethylene resin for blow molding and a preparation method thereof. The melt flow rate of the resin is 0.3-1.0 g / 10min, the density is 0.955-0.965 g / cm<3>, the yellow index is -4-0, the environmental stress cracking resistance time exceeds 50h, the oxidation induction resistance time t is more than or equal to 30min (210 DEG C), and themelt strength value tested under the same condition is 0.20 N or above. A chromium catalyst EP30X is adopted to produce the high-density polyethylene resin for small hollow blow molding on an InnoveneS process double-loop high-density polyethylene device. The high-density polyethylene small hollow special resin for blow molding comprises ethylene-hexene copolymerized high-density polyethylene powder, a main antioxidant, an auxiliary antioxidant, a light stabilizer and an antistatic agent. The resin has high mechanical strength and good processability, can meet the requirement of independentlyprocessing small hollow products, and can be used for manufacturing packaging bottles of various milk products and beverages.

Description

technical field [0001] The invention relates to a modified high-density polyethylene resin for small hollow blow molding and a preparation method thereof. The resin has high melt strength and good processing performance, can meet the requirements for processing small hollow products separately, and can be used for fruit milk , medicine and daily chemical products packaging. Background technique [0002] Currently in China's polyethylene market, high-density polyethylene (HDPE) is widely used in the production of milk bottles, juice bottles, and daily chemical packaging due to its high density, good rigidity, toughness, and good processability. At present, the prominent problem in the small hollow market is the processability and sanitation of the resin. Most companies need to mix and use resin with good fluidity to produce small hollow products, and small hollow products are used to hold dairy products and beverages. There are strict requirements on hygienic performance. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08F210/16C08F210/14C08F2/01
CPCC08L23/0815C08F210/16C08F210/14C08F2/01
Inventor 张威张娜赵长江马国玉李玉松王辉曹建秋
Owner CHINA PETROLEUM & CHEM CORP
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