Surface film forming chlorinated butyl rubber stopper and preparation method thereof

Abstract

The invention relates to a surface film forming chlorinated butyl rubber stopper and a preparation method thereof. The preparation method comprises the following steps: (1) preparing the following materials in percentage by weight: 30-45% of isoprene chloride-isobutene rubber, 35-55% of an aluminum silicate filler, 3-5% of a crosslinking agent, 0.5-1.5% of a coloring agent and 5-15% of polyolefin; (2) sequentially adding the isoprene chloride-isobutene rubber, the aluminum silicate filler, the crosslinking agent and the coloring agent weighed in the step (1) into a closed stirring machine, mixing at 140-160 DEG C, and cooling to the room temperature; (3) adding the weighed polyolefin into the product prepared in the step (2) to mix again, controlling the mixing temperature to be not more than 100 DEG C, and cooling to the room temperature; and (4) performing compression molding forming or injection molding on the product prepared in the step (3) at 170-190 DEG C to obtain the surface film forming chlorinated butyl rubber stopper. The preparation method is simple in process, free from pollution, easy for control over the production condition and good in product quality.

Description

technical field [0001] The invention belongs to the technical field of pharmaceutical packaging materials, in particular to a surface-film-forming chlorinated butyl rubber stopper and a preparation method thereof. Background technique [0002] The high-barrier film-coated rubber plug currently used in the market requires two or more vulcanization and cross-linking processes for its preparation process, and the production cost is very high. The film material has the problem of low extensibility during the film covering process, which limits The height of the neck of the covered rubber stopper affects the airtightness and usability of the covered rubber stopper. High-rigidity membrane materials also have a certain degree of chipping during acupuncture use, which affects the safety of use. [0003] In the past, the preparation process of film-coated rubber plugs is to paste the extruded film on one side with a film, then vulcanize it through a vulcanization mold on the foot, a...

AI Technical Summary

Problems solved by technology

[0004] 1. The process is complicated and there are many production links. For the special industry of pharmaceutical packaging materials, too many production links increase the chance of product contamination and have a greater impact on drug safety;

[0005] 2. There is a lot of rubber waste, which consumes a lot of rubber, a non-renewable resource, and increases production costs;

[0006] 3. The film has to go through the secondary high temperature, which will cause damage to the film, make the film easy to age, reduce its shielding performance and service life, and thus affect the quality of the packaged medicine;

[0007] 4. Due to the many production links and the use of labor, the waste of personnel is caused; and the product quality control is difficult;

[0008] Five, need to go through two high-temperature vulcanization, high energy consumption