A preparation method of anti-oxidation high-density polyethylene resin special for cosmetic bottles

A high-density polyethylene and anti-oxidation technology, which is applied in the field of polyethylene preparation, can solve the problems of inability to achieve long-term anti-oxidation and aging resistance, poor processability of plastic melts, and influence on the safety of cosmetics, so as to improve the shear rate. Sensitivity, good processability, high strength effect

Active Publication Date: 2020-12-18
HANGZHOU KANGHONG IND & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the above-mentioned antioxidant additives can effectively improve the oxidation resistance of high-density polyethylene resins, they are usually added during the resin melting-molding process after the high-density polyethylene resin is polymerized. The properties of high-density polyethylene resin are quite different from those of high-density polyethylene resin, so the compatibility is poor, and it is easy to dissolve after the plastic products are made, which leads to a significant reduction in the oxidation resistance of high-density polyethylene plastic products, and it is impossible to achieve long-term oxidation resistance. Ageing
Moreover, these antioxidant additives will be mixed with the contained cosmetics after dissolution, which also has a certain impact on the safety of cosmetics.
[0004] On the other hand, during melt extrusion processing, due to the addition of antioxidant additives, it will also have a certain negative impact on the rheological properties of the melt, making the processability of the plastic melt worse

Method used

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  • A preparation method of anti-oxidation high-density polyethylene resin special for cosmetic bottles
  • A preparation method of anti-oxidation high-density polyethylene resin special for cosmetic bottles
  • A preparation method of anti-oxidation high-density polyethylene resin special for cosmetic bottles

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preparation example Construction

[0037]Preparation of modified natural olive phenolic extract:

[0038]The natural olive phenolic extract and the ring-opening catalyst (resin loaded with tin chloride) are added to the ethanol aqueous solution with a concentration of 60-80wt%, wherein the concentration of the modified natural olive phenolic extract in the ethanol aqueous solution is 5-15wt%, the mass of the ring-opening catalyst is 1-3% of the modified natural olive phenolic extract.

[0039] Under agitation, the temperature is raised to 75-85°C, and allyl glycidyl ether is continuously added dropwise. The reaction is stirred and the reaction temperature is maintained at 60-65°C. After the reaction is completed, the temperature is reduced to room temperature, the ring-opening catalyst is recovered, and then reduced Rotary evaporation is concentrated to remove the ethanol aqueous solution and allyl glycidyl ether, and finally the modified natural olive phenol extract is obtained after vacuum drying.

[0040]The preparation o...

Embodiment 1

[0046]raw material:

[0047]The purity of ethylene gas is ≥99%, the CO content is less than 43.0mg / kg, CO2The content is less than 44.0mg / kg.

[0048]The purity of 1-butene gas is ≥97%, the water content is less than 425mg / kg, and the total sulfur content is less than 410mg / kg.

[0049]The purity of hydrogen ≥95%, the CO content is less than 45.0mg / kg, CO2The content is ≤10.0mg / kg.

[0050]Preparation of modified natural olive phenolic extract:

[0051]The natural olive phenolic extract and the ring-opening catalyst (resin loaded with tin chloride) are added to the ethanol aqueous solution with a concentration of 70wt%, wherein the concentration of the modified natural olive phenolic extract in the ethanol aqueous solution is 10t% The mass of the ring-opening catalyst is 2% of the modified natural olive phenolic extract.

[0052]Under stirring conditions, the temperature was raised to 80°C, and allyl glycidyl ether was continuously added dropwise. The reaction was stirred and the reaction temperature...

Embodiment 2

[0059]raw material:

[0060]The purity of ethylene gas is ≥99%, the CO content is less than 43.0mg / kg, CO2The content is less than 44.0mg / kg.

[0061]The purity of 1-butene gas is ≥97%, the water content is less than 425mg / kg, and the total sulfur content is less than 410mg / kg.

[0062]The purity of hydrogen ≥95%, the CO content is less than 45.0mg / kg, CO2The content is ≤10.0mg / kg.

[0063]Preparation of modified natural olive phenolic extract:

[0064]The natural olive phenolic extract and the ring-opening catalyst (resin loaded with tin chloride) are added to the ethanol aqueous solution with a concentration of 65% by weight, wherein the concentration of the modified natural olive phenolic extract in the ethanol aqueous solution is 8% by weight The mass of the ring-opening catalyst is 1.5% of the modified natural olive phenolic extract.

[0065]Under stirring conditions, the temperature was raised to 82°C, and allyl glycidyl ether was continuously added dropwise. The reaction was stirred and the re...

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Abstract

The invention relates to the field of polyethylene preparation and discloses a preparation method of special antioxidant high-density polyethylene resin for a cosmetic bottle. The preparation method comprises the following steps: 1) prepolymerization: adding an ethylene gas, hydrogen and a catalyst into a first polymerization kettle containing n-hexane, and performing a polymerization reaction for0.5-1.5h at a temperature of 90-95 DEG C and under a pressure of 1.8-2.0MPa; 2) repolymerization: feeding the polymerization product into a second polymerization kettle, and introducing 1-butene gasand hydrogen, and adding a modified natural olive phenol extract; performing repolymerization for 1-2h at a temperature of 85-90 DEG C and under a pressure of 1.5-1.8MPa; 3) separation and drying: cooling the polymerized slurry product, and then performing separation and drying; 4) mixing and granulating. The special antioxidant high-density polyethylene resin for a cosmetic bottle provided by the invention has relatively good antioxidant ability without adding an antioxidant auxiliary; moreover, without containing additional auxiliaries, the high-density polyethylene resin has relatively high processability.

Description

Technical field[0001]The invention relates to the field of polyethylene preparation, in particular to a preparation method of an oxidation-resistant high-density polyethylene resin special for cosmetic bottles.Background technique[0002]In recent years, the sales of cosmetics in China have been increasing at a very high rate. High-density polyethylene (HDPE) bottles used for cosmetics packaging have the characteristics of good hand feeling, moderate hardness, smooth appearance and good printing effects, and have replaced traditional polyester bottles. And other packaging materials, become the first choice for cosmetics packaging materials. Since there is no special resin for cosmetic bottles in China, the existing high-density polyethylene resin for small hollow containers cannot meet the production demand of products alone. Although high-density polyethylene has a series of advantages, its shortcomings are also very obvious. When it is exposed to heat, light, oxygen and other enviro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/16C08F210/08C08F216/14
CPCC08F210/16C08F210/08C08F216/1416
Inventor 陈刚
Owner HANGZHOU KANGHONG IND & TRADE
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