Thermoplastic elastomer composition and preparation method thereof, sealing gasket, and method for preparing sealing gasket in metal crown lid

A thermoplastic elastomer and sealing gasket technology, applied in the field of packaging, can solve the problems of increasing logistics and initial processing costs, unfavorable glass bottle sealing, and high hardness of sealing gaskets, meeting food safety regulations, reducing flash and gaps, tightly structured effect

Active Publication Date: 2018-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, patent application CN103012903A discloses a method for preparing an effective sealing gasket using a combination of high-impact polystyrene HIPS, low-density polyethylene LDPE, and an elastomer, and a lubricant, but the hardness of the prepared sealing gasket is too high , which is not conducive to the sealing of glass bottles during long-distance transportation; patent application CN102408603A discloses a method for preparing sealing gaskets using low-density polyethylene LDPE, antioxidant masterbatch, coloring masterbatch and elastomer, but the antioxidant masterbatch And the coloring masterbatch contains low-density polyethylene, linear low-density polyethylene, talcum powder and polyethylene wax and other additives to improve gasket performance, but this increases logistics and initial processing costs; disclosed in the patent application CN1465507A A bottle cap gasket prepared from a composition containing ethylene-vinyl acetate copolymer (EVA), paraffin oil, polypropylene, polystyrene and elastomers, such a combination greatly increases logistics costs, while excessive ingredients and The addition of additives will bring serious challenges to the environmental safety and taste of bottle cap gasket materials

Method used

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  • Thermoplastic elastomer composition and preparation method thereof, sealing gasket, and method for preparing sealing gasket in metal crown lid

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preparation example Construction

[0044] According to the method for preparing the sealing gasket in the crown cap provided by the present invention, during the extrusion process, the extrusion conditions are not particularly limited, for example, the extrusion conditions may include: the motor speed is 200-400rpm , the extrusion temperature is 85-120°C, preferably 85-115°C.

[0045] According to the method provided by the present invention, in the stamping process, in order to ensure the stability in the processing process, the stamping speed cannot be too fast, and in order to allow the sealing gasket to be rapidly cooled and formed, the stamping temperature cannot be too high. High, for example, the stamping conditions may include: a stamping speed of 2000-8000 pieces / min, preferably 5000 pieces / min, and a stamping temperature of 5-10°C.

Embodiment 1

[0062] Accurately weigh 1100g of metallocene polyethylene, 900g of styrene-butadiene-styrene block copolymer, and 2g of nucleating agent, mix them in a high-speed mixer for 2min, and use a twin-screw extruder to extrude and granulate. The motor speed is 300rpm, the temperature of the screw section is set to 160°C in the conveying section, 165°C in the melting section, 170°C in the mixing section, 170°C in the exhaust section, and 160°C in the homogenization section, passing through a 20°C cold water tank, and cutting. The resulting mixed ions were dried overnight at 70 °C. The obtained pellets are re-extruded with twin-screws, and the temperature of the screw section is set to 85°C in the conveying section, 90°C in the melting section, 100°C in the mixing section, 105°C in the exhaust section, and 115°C in the homogenization section, and are directly stamped on the crown cover Above, the processing speed is 5000 pieces / min, and the stamping temperature is 10°C.

[0063] Among...

Embodiment 2

[0068] Accurately weigh 1400g of metallocene polyethylene, 600g of styrene-butadiene-styrene block copolymer, and 1g of nucleating agent, mix in a high-speed mixer for 1min, and use a twin-screw extruder to extrude and granulate. The motor speed is 250rpm, the temperature of the screw section is set to 160°C in the conveying section, 165°C in the melting section, 170°C in the mixing section, 170°C in the exhaust section, and 160°C in the homogenization section, passing through a 25°C cold water tank, and cutting. The resulting mixed ions were dried overnight at 70 °C. The obtained pellets are re-extruded with twin-screws, and the temperature of the screw section is set to 85°C in the conveying section, 90°C in the melting section, 100°C in the mixing section, 105°C in the exhaust section, and 115°C in the homogenization section, and are directly stamped on the crown cover Above, the processing speed is 5000 pieces / min, and the stamping temperature is 5°C.

[0069] Among them,...

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Abstract

The invention specifically relates to a thermoplastic elastomer composition and a preparation method and application thereof, and a method for preparing a sealing gasket in a metal crown lid, belonging to the field of packaging. The thermoplastic elastomer composition contains metallocene polyethylene, styrene elastomer and a nucleating agent; evaporation residues obtained after soaking and refluxing of the thermoplastic elastomer composition with ethanol is less than 15 mg / mL; and evaporation residues obtained after soaking and refluxing of the thermoplastic elastomer composition with water is less than 10 mg / mL; The thermoplastic elastomer composition is simple in composition, produces good economic benefits, meets food safety requirements, has low Shore A hardness and good sealing performance, and can guarantee processing stability during high-speed processing.

Description

technical field [0001] The invention relates to the field of packaging, in particular to a thermoplastic elastomer composition, a preparation method thereof, a sealing gasket and a method for preparing the sealing gasket in a crown cap. Background technique [0002] The bottle cap gaskets used in my country's beer industry are mainly based on polyvinyl chloride (PVC) and polyethylene (PE). Wherein, in the sealing gasket of PVC material, relative to 100 parts by weight of the sealing gasket of PVC material, its main components and contents are respectively 35-40 parts by weight of plasticizer, 5 parts by weight of stabilizer, 55-60 parts by weight of PVC and other small amounts of additives, such a gasket material has the characteristics of low hardness and good resilience, so the prepared bottle cap material has good sealing performance. However, as people pay more attention to food safety issues and worry about the harm to the human body after the migration of plasticizers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08L53/02B29C47/92B29C48/92
CPCB29C48/92B29C2948/9258B29C2948/92704C08L23/0815C08L2205/24C08L2207/04C08L53/02
Inventor 徐毅辉邹浩张师军高达利初立秋徐萌杨庆泉邵静波刘建叶徐凯侴白舸吕芸白弈青张琦
Owner CHINA PETROLEUM & CHEM CORP
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