Toughness modified bottle cap

Abstract

The invention provides a toughness modified bottle cap. The bottle cap comprises the following raw materials in parts by weight: 60-80 parts of polyethylene particles, 0.2-0.4 part of styrene block copolymer, 0.5-0.8 part of antimonous oxide and 0.3-0.5 part of saponified EVA (ethylene-vinyl acetate copolymer) or comprises the following raw materials in parts by weight: 60-70 parts of polyethylene particles, 0.2-0.3 part of styrene block copolymer, 0.5-0.6 part of antimonous oxide and 0.3-0.4 part of saponified EVA (ethylene-vinyl acetate copolymer) or comprises the following raw materials in parts by weight: 70-80 parts of polyethylene particles, 0.3-0.4 part of styrene block copolymer, 0.6-0.8 part of antimonous oxide and 0.4-0.5 part of saponified EVA (ethylene-vinyl acetate copolymer). The bottle cap is simple in proportioning and has high production efficiency and excellent quality.

Description

[0001] Technical field: [0002] The invention relates to the technical field of a bottle cap for sealing a medicine bottle, in particular to a bottle cap with modified toughness. [0003] Background technique: [0004] Polyethylene bottle caps are mainly produced by injection molding or compression molding. Due to the high shrinkage rate of polyethylene, it is necessary to lengthen the setting cooling time and pressure holding time of the injection molding machine or compression molding machine in the production process to prevent the appearance of the product. The appearance of defective products such as shrinkage, warping, and irregular inner teeth. But prolonging the setting cooling time will lead to the reduction of production efficiency. At the same time, the size of the polyethylene bottle cap will continue to shrink after being placed for a period of time, resulting in a smaller size, which cannot match the size of the bottle mouth or is too tight. The traditional...

AI Technical Summary

Problems solved by technology

But prolonging the setting cooling time will lead to the reduction of production efficiency

At the same time, the size of the polyethylene bottle cap will continue to shrink after being placed for a period of time, resulting in a smaller size, which cannot match the size of the bottle mouth or is too tight.

The traditional polyethylene bottle cap modification is to reduce the shrinkage of polyethylene by adding filler masterbatch, but the method of adding filler masterbatch has the following disadvantages: First, it affects the physical properties of polyethylene bottle caps, such as reducing the surface gloss and mechanical properties

Secondly, PP bottle caps are widely used in the beverage, food and pharmaceutical industries, which have very strict hygiene requirements, and there are great safety hazards in adding a large amount of filling.