High and low temperature resistant plastic bottle cap and manufacturing process thereof

Abstract

The invention provides a high and low temperature resistant plastic bottle cap and a manufacturing process thereof, and belongs to the field of high performance plastics, wherein the high and low temperature resistant plastic bottle cap comprises the following components in parts by mass: 60-75 parts of high density polyethylene, 8-16 parts of temperature resistant modified masterbatch, 4-8 parts of low molecular weight branched polyethylene, 1-4 parts of maleic anhydride grafted polypropylene, 1-4 parts of pentadiene, 2-4 parts of a filler, and 1-10 parts of a first auxiliary agent; the temperature-resistant modified master batch is composed of low-density polyethylene, a temperature-resistant modifier and a second auxiliary agent in a mass ratio of 50:(25-45):(1-5); and on the basis of an existing HDPE material, the modifier is added, so that the high and low temperature resistance of the HDPE material is improved.

Description

technical field [0001] The invention relates to the field of high-performance plastics, in particular to a high and low temperature resistant plastic bottle cap and a manufacturing process thereof. Background technique [0002] Bottle caps are an important part of food and beverage packaging, and they are also the first place where consumers come into contact with products. The bottle cap has the function of keeping the content product airtight, and also has the functions of anti-theft opening and safety, so it is widely used in bottled products, so the bottle cap is the upstream industry of food, beverage, wine, chemical industry, and pharmaceutical industry. It is a key product of bottle container packaging. [0003] The main raw material of plastic bottle caps is polypropylene or polyethylene. In order to ensure that food or beverages do not deteriorate, high-temperature sterilization processes are often included in the production process, but the high-temperature steril...

AI Technical Summary

Problems solved by technology

[0003] The main raw material of plastic bottle caps is polypropylene or polyethylene. In order to ensure that food or beverages do not deteriorate, high-temperature sterilization processes are often included in the production process, but the high-temperature sterilization temperature reaches 121°C, and the sterilization time is usually 15- However, the plastic bottle caps in the prior art are usually not resistant to high temperatures, or the effect of high temperature resistance is not good, especially the bottle caps produced by PE plastics are prone to deformation during the high temperature sterilization process, thus affecting the quality of the bottle. The sealing performance of the lid, causing food leakage or rapid spoilage

[0004] On the other hand, it is often necessary to refrigerate or freeze during the use of food or beverages. Although the plastic bottle caps in the prior art can withstand low temperatures, they have poor toughness and impact resistance at low temperatures and are relatively brittle, resulting in It is easy to break during refrigeration or freezing, and it is difficult for the bottle caps in the prior art to simultaneously satisfy its mechanical strength, toughness and impact resistance in a wide temperature range

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