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A kind of adhesive-free bottle cap gasket and/or liner and preparation method thereof

A technology that avoids adhesives and gaskets, applied in the field of materials, can solve problems such as increasing energy consumption, VOC emissions, and increasing process complexity, and achieves low cost, strong pressure resistance, and high bonding strength. Effect

Active Publication Date: 2018-07-10
FOSHAN TONGJUN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gaskets and liners made of these materials require the use of adhesive technology, which virtually increases the complexity of the process, increases energy consumption and VOC emissions

Method used

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  • A kind of adhesive-free bottle cap gasket and/or liner and preparation method thereof
  • A kind of adhesive-free bottle cap gasket and/or liner and preparation method thereof
  • A kind of adhesive-free bottle cap gasket and/or liner and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] An adhesive-free bottle cap gasket / or liner is prepared from the following raw materials in weight fractions:

[0039]

[0040] Among them, the number average molecular weight of styrene-butadiene-styrene block copolymer (SBS) is 5.25.2×10 5 , the mass content of polystyrene and polybutadiene blocks is 15% and 45% respectively;

[0041] Described polyethylene is linear low-density polyethylene (LLDPE) and low-density polyethylene (LDPE) and mixture, and wherein LLDPE content is 60%, and LDPE content is 40%, and the melting index MFI of LLDPE and LDPE is respectively 3.2 / 10min ( 230°C, 2.16kg) and 0.8 / 10min (230°C, 2.16kg).

[0042] Step 1: Mix the above raw materials evenly, and then add them into the hopper of the injection molding machine for extrusion granulation; the granulation temperature is 150°C, the twin-screw speed is 360r / min, and the gasket pellets are obtained;

[0043] Step 2: Put the gasket pellets obtained in Step 1 into a molding machine, extrude l...

Embodiment 2

[0045] An adhesive-free bottle cap gasket / or liner is prepared from the following raw materials in weight fractions:

[0046]

[0047] Among them, the number average molecular weight of styrene-butadiene-styrene block copolymer (SBS) is 3.8×10 5 , the mass content of polystyrene and polybutadiene blocks is 20% and 35% respectively;

[0048]Described polyethylene is linear low-density polyethylene (LLDPE) and low-density polyethylene (LDPE) and mixture, and wherein LLDPE content is 50%, and LDPE content is 50%, and the melting index MFI of LLDPE and LDPE is respectively 4.4 / 10min ( 230°C, 2.16kg) and 0.8 / 10min (230°C, 2.16kg).

[0049] Step 1: Mix the above raw materials evenly, and then add them into the hopper of the injection molding machine for extrusion and granulation; the granulation temperature is 85°C, the twin-screw speed is 350r / min, and the gasket pellets are obtained;

[0050] Step 2: Put the gasket pellets obtained in Step 1 into a molding machine, extrude li...

Embodiment 3

[0052] An adhesive-free bottle cap gasket / or liner is prepared from the following raw materials in weight fractions:

[0053]

[0054] Among them, the number average molecular weight of styrene-isoprene-styrene block copolymer (SIS) is 1.8×10 5 , the mass content of polystyrene and polyisoprene blocks is 15% and 45% respectively;

[0055] Described polyethylene is linear low-density polyethylene (LLDPE) and low-density polyethylene (LDPE) and mixture, and wherein LLDPE content is 40%, and LDPE content is 60%, and the melting index MFI of LLDPE and LDPE is respectively 5.2 / 10min ( 230°C, 2.16kg) and 0.8 / 10min (230°C, 2.16kg).

[0056] Step 1: Mix the above raw materials evenly, and then add them into the hopper of the injection molding machine for extrusion granulation; the granulation temperature is 170°C, the twin-screw speed is 500r / min, and the gasket pellets are obtained;

[0057] Step 2: Put the gasket pellets obtained in Step 1 into a molding machine, extrude liquid...

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Abstract

An adhesive-free bottle cap gasket pellet, prepared from the following raw materials in parts by weight: 50-80 parts of thermoplastic elastomer; 15-40 parts of polyethylene; 5-15 parts of rosin resin; and 5-10 parts of octadecanamide. A preparation method comprises: thoroughly mixing the raw materials in parts by weight, extruding, pelletizing, water-cooling, and drying same to form special pellets for a bottle cap gasket and / or padding, and putting the pellets into a molding machine, extruding droplets into a bottle cap at 100-150°C, compressing to form so as to obtain an adhesive-free gasket and / or padding. The gasket pellets can be directly injection-molded so as to form a gasket and / or padding with a strong strength of bonding with the bottle cap without any adhesive, so that the bottle cap production process is simpler and the energy consumption is reduced; the gasket pellets have passed strict food safety testing, and are especially applicable to the production of food bottle caps; the adverse effects of the adhesive on the food in a bottle are avoided; the competitiveness of domestic bottle cap manufacturers is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to an adhesive-free bottle cap gasket and / or liner and a preparation method thereof. Background technique [0002] With the continuous development of the economy, bottle cap gaskets and liners are widely used in food industries such as alcohol, food, health care products, medicines, and cosmetics. Food bottle cap gaskets and liners are made of various structural materials, including polyethylene (PE), ethylene / vinyl acetate copolymer (EVA), polyvinyl chloride (PVC), thermoplastic elastomer (TPE), vulcanized rubber, Polymer materials such as epoxy resin coating and copper sheet or paper, among which PVC, PE, TPE and other polymers and their blend materials are mainly used to place between two planes to strengthen the sealing material, with The role of preventing fluid leakage. [0003] At present, most of the domestic food bottle cap gaskets and liners are made of pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L53/02C08L23/06C08L23/08C08L93/04C08L61/14C08K5/20
CPCC08L53/02C08L53/025C08L2205/03C08L2207/04C08L2207/066
Inventor 车俊峥祝方明简静姬
Owner FOSHAN TONGJUN ENVIRONMENTAL PROTECTION TECH CO LTD
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