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Rubber/fluoroplastic composite resealing shock insulator and preparation method thereof

A fluoroplastic and resealing technology, applied in the field of rubber/fluoroplastic composite resealing septum and its preparation, can solve the problem that the fluoroplastic layer and the rubber layer are easily separated, the resealability of the septum cannot meet the requirements, and the needling perforation It is not easy to seal and other problems, so as to reduce the escape of residual components, meet the requirements of multiple injections, and meet the effect of long-term storage.

Pending Publication Date: 2019-10-29
浙江哈迈科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The Chinese invention patent with the publication number CN107351489A discloses a natural rubber, butyl rubber, film-laminated gasket and its production process. By adjusting the specific gravity of each component in the rubber, selecting suitable accelerators and active agents, etc., Improve the rebound performance of rubber and make up for the shortcomings of poor rubber resilience
However, the resealability of the rubber / fluoroplastic composite septa not only requires the rubber to have high resilience, but also requires that the rubber layer and the fluoroplastic layer must be firmly bonded and the fluoroplastic layer must also have high resilience. After the injection needle pierces the septum repeatedly for sample injection, the fluoroplastic layer around the needle hole is separated from the rubber layer, resulting in enlarged pores in the fluoroplastic layer, which are difficult to close, resulting in the penetration of volatile reagents to be detected into the rubber through the micropores. The layer is contaminated, and cannot meet the requirements of resealability and multiple injections
[0006] However, the inherent poor adhesion of fluoroplastics greatly limits its adhesion to the rubber layer.
The Chinese patent with the publication number CN108117845A discloses a method for bonding fluoroplastics and rubber, which is bonded through a conventional vulcanization process after being treated with a catalyst and a treatment agent. still not obvious
[0007] It can be seen that the rubber / fluoroplastic composite septum in the prior art has the problems that the fluoroplastic layer and the rubber layer are easy to separate, and the fluoroplastic layer has problems such as poor resilience. Resealing cannot meet the requirements

Method used

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  • Rubber/fluoroplastic composite resealing shock insulator and preparation method thereof
  • Rubber/fluoroplastic composite resealing shock insulator and preparation method thereof
  • Rubber/fluoroplastic composite resealing shock insulator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The resealable septum of this example consists of a rubber layer (methyl vinyl silicone rubber compound, 0.5 mm thick), an intermediate layer (silicone epoxy resin, 7 microns thick), and a fluoroplastic layer (PTFE, 0.5 mm thick). 27 microns), and obtained by the following preparation method:

[0057] (1) Coat silicone epoxy resin on the surface of PTFE and mold it at 260°C and 18MPa to obtain a composite film;

[0058] (2) Preparation of the rubber layer: weighing 100 parts of methyl vinyl silicone rubber, 0.5 parts of zinc stearate, 0.3 parts of white carbon black, 0.3 parts of color masterbatch, 1 part of dicumyl peroxide (DCP), iron oxide 3 parts of red, 3 parts of hydroxy silicone oil; mix well, then knead and release the film to form a regular film that is easy to vulcanize;

[0059] (3) Preparation of film-coated film: Cover the composite film obtained in step (1) on the surface of the rubber layer, with the silicone-coated side facing the rubber layer. Vulcani...

Embodiment 2

[0065] The resealing septum of embodiment 2-8, wherein the thickness of the rubber layer of embodiment 2 is 0.5 mm, the thickness of the middle layer is 5 microns, and the thickness of the fluoroplastic layer is 22 microns; the thickness of the rubber layer of embodiment 3 is 0.8 mm, the thickness of the middle layer The thickness of the layer is 9 microns, and the thickness of the fluoroplastic layer is 30 microns; the thickness of each layer of Embodiment 4-8 is the same as that of Embodiment 3, and the rubber layer material components and corresponding parts by weight of Embodiment 2-8 are as shown in Table 1 Shown, others are identical with embodiment 1.

[0066] Table 1. Embodiment 2-8 rubber layer material components and corresponding parts by weight thereof

[0067]

[0068]

[0069] The resealing septum obtained in embodiment 2-8 is a three-layer structure, and the scanning electron microscope picture of the septum section in embodiment 2 is as follows image 3 ...

Embodiment 9-15

[0073] The difference between the resealable septa of Examples 9-15 and Example 1 is that the molding process, vulcanization process and drying process are different. Table 3 shows the differences in molding temperature and pressure, vulcanization temperature and pressure, secondary vulcanization temperature and pressure, and drying temperature between the rubber layer and the PTFE layer.

[0074] Processing technology among the table 3. embodiment 9-15

[0075]

[0076]

[0077] The resealable septum obtained in Examples 9-15 has a three-layer structure, and the bonding strength between the PTFE layer and the rubber layer is shown in Table 4.

[0078] The adhesive strength of PTFE layer and rubber layer among the table 4. embodiment 9-15

[0079]

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Abstract

The invention belongs to the field of pharmaceutical packaging materials, and relates to a rubber / fluoroplastic composite resealing shock insulator and a preparation method thereof. The rubber / fluoroplastic composite resealing shock insulator comprises a rubber layer, an intermediate layer and a fluoroplastic layer; intermediate layer materials comprise one or more of organosilicon, silica gel andperfluoroalkylation; fluoroplastic layer materials comprise one or more of a perfluoroethylene propylene copolymer, polytetrafluoroethylene, an ethylene-tetrafluoroethylene copolymer and polyvinylidene fluoride; a fluoroplastic layer has a sub-micron micropore structure; and rubber layer materials comprise one or more butyl rubber, natural rubber, silicone rubber, fluororubber and epdm rubber. The preparation method of the rubber / fluoroplastic composite resealing shock insulator comprises the steps of composite film forming, preparation of the rubber layer, preparation of a coated film, vulcanization, cleaning, drying and the like.

Description

technical field [0001] The invention belongs to the field of medical packaging materials, and relates to a rubber / fluoroplastic composite resealing septum and a preparation method thereof. Background technique [0002] The main products of fluoroplastics include polytetrafluoroethylene (PTFE), perfluoroethylene propylene copolymer (FEP), polyvinylidene fluoride (PVE), ethylene-tetrafluoroethylene copolymer (ETFE), polychlorotrifluoroethylene (PCTFE) Wait. Rubber has properties such as oil resistance, acid and alkali resistance, cold and heat resistance, and aging resistance, while fluoroplastics have excellent solvent resistance, heat resistance, dielectric properties, and aging resistance due to the fluorine-carbon bond structure and the shielding effect of fluorine atoms. Self-lubrication and other properties, and has a wide temperature range. Therefore, rubber / fluoroplastic composite septa are usually used in chromatography, environmental sampling, medical diagnosis, ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B25/08B32B25/20B32B7/12B32B3/24B32B25/18B32B33/00B29D7/00C08L83/07C08L83/04C08K13/02C08K5/098C08K3/36C08K5/14C08K3/22C08L23/28C08L91/06C08K3/26C08K3/06C08K3/04C08L7/00C08K5/09
CPCB29D7/00B32B3/266B32B7/12B32B25/08B32B25/18B32B25/20B32B27/322B32B33/00B32B2250/24B32B2581/00C08K3/06C08K3/22C08K3/26C08K5/09C08K13/02C08K2003/2272C08K2003/2296C08K2003/265C08L23/283C08L83/04C08L2205/025C08K5/098C08K3/36C08K5/14C08L91/06C08K3/04C08L7/00
Inventor 金渊源金来源王玮
Owner 浙江哈迈科技有限公司
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