PP modified bottle cap

Abstract

The invention provides a PP modified bottle cap. The PP modified bottle cap is characterized by being prepared from the following raw materials in parts by weight: 60-80 parts of PP particles, 0.2-0.4 part of sorbic acid, 0.5-0.8 part of hindered phenol phosphate, 0.3-0.5 part of pigment and 0.2 part of PE wax; or, the PP modified bottle cap is characterized by being prepared from the following raw materials in parts by weight: 60-70 parts of PP particles, 0.2-0.3 part of sorbic acid, 0.5-0.6 part of hindered phenol phosphate, 0.3-0.4 part of pigment and 0.2 part of PE wax; or, the PP modified bottle cap is characterized by being prepared from the following raw materials in parts by weight: 70-80 parts of PP particles, 0.3-0.4 part of sorbic acid, 0.6-0.8 part of hindered phenol phosphate, 0.4-0.5 part of pigment and 0.2 part of PE wax. The PP modified bottle cap is simple in preparation, high in production efficiency and excellent in quality.

Description

[0001] Technical field: [0002] The invention relates to the technical field of bottle caps for sealing medicine bottles, in particular to a PP modified bottle cap. [0003] Background technique: [0004] PP bottle caps are mainly produced by injection molding or compression molding. Due to the large shrinkage rate of PP, 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 from shrinking. , warping, irregular inner teeth and other defective products. But prolonging the setting cooling time will lead to the reduction of production efficiency. At the same time, the size of the PP 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 PP bottle cap modification is to reduce the shrinkage of...

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 PP 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 PP bottle cap modification is to reduce the shrinkage of PP by adding filler masterbatch, but the method of adding filler masterbatch has the following disadvantages: First, it affects the physical properties of PP bottle caps, such as reducing 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.