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Preparation method of special antioxidant high-density polyethylene resin for cosmetic bottle

A high-density polyethylene and anti-oxidation technology, which is applied in the field of polyethylene preparation, can solve problems such as the inability to achieve long-term anti-oxidation and aging resistance, the impact on the safety of cosmetics, and the deterioration of the processability of plastic melts. Sensitivity, high strength, good processability

Active Publication Date: 2018-12-21
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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  • Preparation method of special antioxidant high-density polyethylene resin for cosmetic bottle
  • Preparation method of special antioxidant high-density polyethylene resin for cosmetic bottle
  • Preparation method of special antioxidant high-density polyethylene resin for cosmetic bottle

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preparation example Construction

[0037] Preparation of modified natural olive phenolic extracts:

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

[0039] Heat up to 75-85°C with stirring, continue to add allyl glycidyl ether dropwise, stir the reaction and keep the reaction temperature at 60-65°C until the reaction is complete, then cool down to normal temperature, recover the ring-opening catalyst, and then reduce The ethanol aqueous solution and allyl glycidyl ether are concentrated and removed by rotary evaporation, and finally the modified natural olive phenolic extract is obtained after vacuum drying.

[0040] The preparation of special antioxidant high-density polyethylene resin for cosmetic bottles comprise...

Embodiment 1

[0046] raw material:

[0047] The purity of ethylene gas is ≥99%, the CO content is less than 43.0mg / kg, and the CO 2 The 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 is ≥95%, the CO content is less than 45.0mg / kg, CO 2 Content ≤10.0mg / kg.

[0050] Preparation of modified natural olive phenolic extracts:

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

[0052] Raise the temperature to 80°C with stirring, continue to add allyl glycidyl ether dropwise, stir the reaction and keep the reaction tem...

Embodiment 2

[0059] raw material:

[0060] The purity of ethylene gas is ≥99%, the CO content is less than 43.0mg / kg, and the CO 2 The 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 is ≥95%, the CO content is less than 45.0mg / kg, CO 2 Content ≤10.0mg / kg.

[0063] Preparation of modified natural olive phenolic extracts:

[0064] Adding the natural olive phenolic extract and the ring-opening catalyst (resin loaded with tin chloride) to a concentration of 65wt% ethanol solution, wherein the modified natural olive phenolic extract concentration in the ethanol solution is 8wt% , the quality of the ring-opening catalyst is 1.5% of the modified natural olive phenolic extract.

[0065] Raise the temperature to 82°C under stirring conditions, continuously add allyl glycidyl ether dropwise, stir the reaction and keep the reaction temperature ...

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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 a special anti-oxidation high-density polyethylene resin for cosmetic bottles. Background technique [0002] In recent years, the sales of cosmetics in China have been increasing at a very high rate. The high-density polyethylene (HDPE) bottle used as cosmetic packaging has the characteristics of good hand feeling, moderate hardness, smooth appearance and good printing effect. It has replaced the traditional polyester bottle. And other packaging materials, become the preferred packaging material for cosmetics. Since there is no special resin for cosmetic bottles in China, the existing high-density polyethylene resins for small hollow containers cannot meet the production needs of products alone. Although high-density polyethylene has a series of advantages, its disadvantages are also very obvious. When it is exposed to heat, light, oxygen and other...

Claims

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Application Information

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