Process formula and preparation method of piston for pen type syringe

Abstract

A process formula and a preparation method of a piston for a pen type syringe belong to the field of officinal syringe pistons. The piston is characterized by being prepared by the following raw materials by weight: 44500 parts of chlorinated butyl rubber, 41500 parts of calcined kaolin, 655 parts of tertiary octyl phenol formaldehyde resin, 480 parts of stearic acid, 2260 parts of zinc oxide, 880 parts of modified polyethylene, 1180 parts of titanium dioxide, 156 parts of half-reinforcing furnace black and 60 parts of magnesium oxide. The preparation method is characterized by including (1) dosing and banburying; (2) placing the mixture statically for 1 to 10 days; (3) pre-forming; (4) placing the mixture statically for 12 hours to 10 days; (5) conducting vulcanizing heat forming in 0.3-million-grade clean area environment; (6) conducting edge removing in the 0.3-million-grade clean area environment; (7) conducting scrap screening in 0.1-million-grade clean area environment; and (8) conducting washing, silicification, drying and packaging in myriad-grade clean area environment. The process is simple, safe, environment-friendly and high in cleaning degree.

Description

technical field [0001] The invention provides a technical formula and a preparation method for a plunger for a pen-type syringe, belonging to the field of plunger for medicinal syringes. Background technique [0002] The piston of a medical syringe is the most commonly used sealing element in the field of pharmaceutical packaging materials. It is used in the cavity of the syringe to prevent fluid leakage and facilitate the injection of drugs. Traditional pharmaceutical synthetic pistons are produced from polyisoprene rubber and related accessories through more than 20 processes such as rubber mixing, vulcanization, tableting, slicing, cold punching, siliconization, and refrigeration. The production process is cumbersome and It consumes time and pollutes the environment. Not only does the production cost remain high, but also the quality of the product cannot be guaranteed due to the insufficient cleanliness of the production environment. A low-cost, simple process, safe and...

AI Technical Summary

Problems solved by technology

Traditional pharmaceutical synthetic pistons are produced from polyisoprene rubber and related accessories through more than 20 processes such as rubber mixing, vulcanization, tableting, slicing, cold punching, siliconization, and refrigeration. The production process is cumbersome and Energy consumption is time-consuming and pollutes the environment to a certain extent. Not only does the production cost remain high, but also the product quality cannot be guaranteed due to the insufficient cleanliness of the production environment.

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