Corrosion-resistant PE composite modified corrosion-resistant material gasket

Abstract

The utility model provides a corrosion-resistant PE composite modified corrosion-resistant material gasket which comprises a modified polytetrafluoroethylene film material layer arranged on the outermost layer and a PE foaming material layer arranged on the inner side of the modified polytetrafluoroethylene film material layer, and a peculiar smell blocking layer made of a high-barrier material ethylene-vinyl alcohol copolymer (EVOH) is arranged between the modified polytetrafluoroethylene film material layer and the PE foaming material layer. All the layers are bonded through a degradable adhesive. Belongs to the technical field of chemistry. According to the PE composite modified corrosion-resistant material gasket, through improvement and optimization of a multi-layer structure, the corrosion resistance and the sealing performance of the gasket are remarkably improved, the gasket has the advantages of being environmentally friendly, sanitary, safe, high in structural strength, high in adaptability and the like, and the using effect and the market competitiveness of the gasket are greatly improved.

Description

Technical Field

[0001] The utility model relates to a corrosion-resistant gasket made of PE composite modified corrosion-resistant material, belonging to the field of chemical technology. Background Art

[0002] The diversity and property differences of chemical reagents make their packaging a long-term problem faced by chemical reagent manufacturers. As a key part in direct contact with products, the selection of sealing gaskets is a particularly challenging task. Among numerous manufacturing materials, it is particularly difficult to find a material with excellent performance, strong versatility, good curability, and corrosion resistance as the preferred packaging material. Currently, the commonly used sealing gaskets in chemical reagent packaging mainly include polytetrafluoroethylene and PE foam gaskets, and a small number of manufacturers also use gaskets made of rubber-coated polytetrafluoroethylene material.

[0003] Polytetrafluoroethylene gaskets are widely used in the packaging of highly corrosive chemical reagents due to their excellent corrosion resistance. However, polytetrafluoroethylene gaskets are prone to cold flow under pressure and creep when heated. The biggest drawback is that they are hard in texture and lack good elasticity, and when applied to lids, they cannot fit well with the bottle mouths, reducing the sealing performance of the gaskets. PE foam gaskets have good heat stability, resilience, corrosion resistance, and aging resistance, so they are widely used in the packaging of chemical reagents. However, due to their low corrosion resistance, they are vulnerable to corrosion by highly corrosive reagents, resulting in leakage. Rubber-coated polytetrafluoroethylene film gaskets have good elasticity and corrosion resistance and can overcome the shortcomings of the first two types of gaskets. However, their main substrate rubber is relatively soft and is easily affected by temperature and chemical products, accelerating aging and deformation, leading to leakage, and it is also easy to emit product odors. Currently, they have been gradually phased out in this field. Therefore, although these three types of gaskets have their own advantages, due to the limitations of the use environment and storage conditions, they cannot be widely used in the packaging of chemical reagents.

[0004] Therefore, there is an urgent need in this field for a corrosion-resistant gasket made of PE composite modified corrosion-resistant material. Summary of the Invention

[0005] The purpose of the utility model is to solve the problem that the gaskets in the prior art are not corrosion-resistant and are restricted by the use environment and storage conditions, and cannot be widely used in the packaging of chemical reagents.

[0006] To achieve the above-mentioned purpose of solving the problem, the technical solution adopted by the utility model is to provide a corrosion-resistant gasket made of PE composite modified corrosion-resistant material, including a modified polytetrafluoroethylene film material layer provided on the outermost layer and a PE foam material layer provided inside the modified polytetrafluoroethylene film material layer. An odor barrier layer made of a high-barrier material ethylene-vinyl alcohol copolymer (EVOH) is provided between the two layers; each layer is bonded through a degradable adhesive.

[0007] Preferably, the thickness of the odor barrier layer is 20 - 50 microns and it is tightly bonded with other layers through a co - extrusion process.

[0008] Preferably, the surface of the modified polytetrafluoroethylene membrane material layer is coated with a nano - coating.

[0009] This design can increase its chemical corrosion resistance and abrasion resistance, and improve the service life of the gasket.

[0010] Preferably, the surface of the PE foam material layer is coated with an antibacterial coating.

[0011] This design can prevent bacterial growth, is suitable for the packaging and storage of chemical reagents in the pharmaceutical and food industries, and improves the hygienic safety of the product.

[0012] Preferably, the thickness of the gasket is increased in the edge area, making it thicker than the middle part.

[0013] This design can provide additional compressive resistance and prevent the edge from deforming during long - term use. The specific operation method is to thicken the edge part through a mold during the manufacturing process.

[0014] Preferably, the edge of the PE foam material layer adopts a trapezoidal structure, so that the edge thickness gradually increases from the inside to the outside.

[0015] This trapezoidal edge design not only enhances the overall strength of the gasket, but also better adapts to the sealing requirements of different types of bottle mouths. In addition, it also improves the compressive resistance of the edge, preventing the edge from deforming during long - term use and affecting the sealing effect.

[0016] Preferably, the PE foam material uses biodegradable PE material, which improves the environmental performance of the gasket, reduces environmental pollution, and conforms to the trend of green chemical industry.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. Enhanced corrosion resistance and service life. By coating a nano - coating on the surface of the modified polytetrafluoroethylene membrane, the gasket significantly improves its chemical corrosion resistance and abrasion resistance, thus extending the service life of the gasket.

[0019] 2. Improved sealing performance and airtightness. By adding an odor barrier layer made of ethylene - vinyl alcohol copolymer (EVOH) with high barrier properties between the PE foam material layer and the modified polytetrafluoroethylene membrane, the odor molecules of chemical reagents are effectively blocked from leaking outwards, further improving the sealing performance of the gasket.

[0020] 3. Achieved environmental protection and sustainable development. The use of biodegradable PE materials to manufacture the foamed gasket enhances the environmental performance of the gasket, reduces environmental pollution, and conforms to the trend of green chemistry. At the same time, the gasket is designed with a recyclable structure. Through a separable multi-layer structure, each layer of material can be easily disassembled and reused after use, reducing production costs and environmental burdens.

[0021] 4. Improved hygiene and safety. An antibacterial coating is added to the surface of the PE foam layer to prevent bacterial growth, making it suitable for the packaging and storage of medical and food chemical reagents, and enhancing the hygienic safety of the product.

[0022] 5. Enhanced the structural strength of the gasket. By increasing the thickness and strengthening the design in the edge area of the gasket, namely, thickening the edge and trapezoidal edge design, additional compressive resistance is provided to prevent the edge from deforming during long-term use, thus ensuring the sealing effect during long-term use.

[0023] 6. Improved the sealing and corrosion resistance. The gasket is combined with a modified polytetrafluoroethylene membrane and a PE foam gasket to ensure excellent sealing and corrosion resistance under various chemical reagent storage conditions.

[0024] In summary, through the improvement and optimization of the multi-layer structure, the gasket of the utility model made of PE composite modified corrosion-resistant material not only significantly enhances the corrosion resistance and sealing performance of the gasket, but also has many advantages such as environmental protection, hygiene, safety, high structural strength and strong adaptability, greatly improving the use effect and market competitiveness of the gasket. From now on, except for a small part of special reagents, reagent manufacturers can use this gasket for encapsulation, which also simplifies the complicated procurement items of reagent manufacturers, further reduces inventory costs and stocking quantities, optimizes the packaging plan, enabling the reagent to be sealed and stored for a long time and withstand long-distance transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic cross-sectional view of the corrosion-resistant PE composite modified polytetrafluoroethylene gasket.

[0026] Figure 2 It is a schematic view of the corrosion-resistant PE composite modified polytetrafluoroethylene gasket.

[0027] Reference numerals: 1-1, modified polytetrafluoroethylene membrane material layer; 1-2, PE foam material layer; 1-3, antibacterial coating; 1-4, foamed gasket; 1-5, modified polytetrafluoroethylene membrane; 1-6, nano coating; 1-7, gasket edge area one; 1-8, odor barrier layer; 1-9, degradable adhesive; 2-1, gasket edge area two. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the present utility model more obvious and understandable, the following is a detailed description with preferred embodiments and in conjunction with the accompanying drawings:

[0029] As Figure 1-2 shown, the present utility model provides a corrosion-resistant PE composite modified corrosion-resistant material gasket.

[0030] Embodiment

[0031] As Figure 1 shown, the improved PE composite modified corrosion-resistant gasket consists of multiple layers, including a modified polytetrafluoroethylene film material (1-1), a foamed gasket (1-4), a modified polytetrafluoroethylene film (1-5), and multiple functional coating and material layers, which are bonded through a coextrusion process and a degradable adhesive (1-9). The specific structure is introduced as follows:

[0032] 1. The modified polytetrafluoroethylene film material layer (1-1) is located on the outermost layer, having excellent chemical corrosion resistance and mechanical strength, and can directly contact chemical reagents. A nano-coating (1-6) is coated on its surface to increase its chemical corrosion resistance and abrasion resistance, thereby improving the service life of the gasket.

[0033] 2. The PE foamed material layer (1-2) provides the softness and elasticity of the gasket, enhancing the sealing performance. The foamed gasket uses a biodegradable PE material, improving the environmental performance of the gasket, reducing environmental pollution, and conforming to the trend of green chemical industry.

[0034] 3. An odor barrier layer (1-8) made of ethylene-vinyl alcohol copolymer (EVOH) with a thickness of 20-50 microns is added between the PE foamed material layer (1-2) and the modified polytetrafluoroethylene film material layer (1-1). It has excellent gas barrier performance and can effectively block the odor molecules of chemical reagents, preventing them from leaking outwards. This barrier layer is tightly combined with other layers through a coextrusion process.

[0035] 4. An antibacterial coating (1-3) is added on the surface of the PE foamed material layer (1-2) to prevent bacteria from growing, which is suitable for the packaging and storage of chemical reagents in the pharmaceutical and food industries, improving the hygienic safety of the product.

[0036] 5. The edge area one (1-7) of the gasket is thickened, making it thicker than the middle part, increasing the anti-compression ability of the gasket, preventing the edge from deforming during long-term use, and thus ensuring the sealing effect during long-term use. The edge area two (2-1) of the gasket is designed as a trapezoid, making the edge thickness gradually increase from the inside to the outside, not only enhancing the overall strength of the gasket but also better adapting to the sealing requirements of different types of bottle mouths.

[0037] Before use, install the gasket inside the packaging cover, make it contact with the matching cover and the packaged product, and fill it into the gasket groove of the packaging cover manually or by professional equipment. The modified polytetrafluoroethylene film (1-5) and the foamed gasket (1-4) are of the same size and are both circular to ensure a good fit with the packaging cover and the bottle mouth.

[0038] Then, use special equipment or manually tighten the matching cover until it cannot be rotated further, and twist the product with a torque wrench until it is completely sealed. During the process of tightening the packaging cover, the modified polytetrafluoroethylene film (1-1) and the antibacterial coating on the PE bottom surface (1-3) shrink inward under pressure, applying pressure to the foamed gasket (1-4), causing it to elastically contract inward to form a depression that fits the bottle mouth, thus achieving a complete elastic seal.

[0039] Through the above specific implementation manner, the gasket of the PE composite modified corrosion-resistant material of the present utility model has significant advantages in improving corrosion resistance, sealing performance and environmental protection performance, and is suitable for the packaging and long-term storage of various chemical reagents. The design of this gasket not only simplifies the procurement and inventory management of reagent manufacturers, but also effectively reduces production costs and environmental burdens, optimizes the packaging solution, enabling chemical reagents to be sealed and stored for a long time and withstand long-distance transportation.

[0040] The above is only a preferred embodiment of the present utility model, and does not impose any formal or substantial limitations on the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the premise of the present utility model, several improvements and supplements can still be made, and these improvements and supplements should also be regarded as the protection scope of the present utility model. For those who are familiar with this specialty, without departing from the spirit and scope of the present utility model, any equivalent changes made by slightly modifying, decorating and evolving using the technical content disclosed above are equivalent embodiments of the present utility model; at the same time, any equivalent changes made by modifying, decorating and evolving the above embodiments based on the essential technology of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A corrosion-resistant PE composite modified corrosion-resistant material gasket, characterized in that: It includes a modified polytetrafluoroethylene film material layer arranged on the outermost layer and a PE foam material layer arranged on the inner side of the modified polytetrafluoroethylene film material layer, and an odor barrier layer made of a high barrier material ethylene-vinyl alcohol copolymer is arranged between the two; the layers are bonded by a degradable adhesive.

2. The corrosion-resistant PE composite modified corrosion-resistant material gasket according to claim 1, characterized in that: The odor barrier layer has a thickness of 20-50 microns and is tightly combined with the PE foam material layer and the modified polytetrafluoroethylene film material layer through a co-extrusion process.

3. The corrosion-resistant PE composite modified corrosion-resistant material gasket according to claim 1, characterized in that: The surface of the modified polytetrafluoroethylene film material layer is coated with a nano coating.

4. The corrosion-resistant PE composite modified corrosion-resistant material gasket according to claim 1, characterized in that: The surface of the PE foam material layer is coated with an antibacterial coating.

5. The corrosion-resistant PE composite modified corrosion-resistant material gasket according to claim 1, characterized in that: The edge area of ​​the gasket increases in thickness, making it thicker than the middle portion.

6. The corrosion-resistant PE composite modified corrosion-resistant material gasket according to claim 1, characterized in that: The edge of the PE foam material layer adopts a trapezoidal structure, so that the edge thickness gradually increases from the inside to the outside.

7. The corrosion-resistant PE composite modified corrosion-resistant material gasket according to claim 1, characterized in that: The PE foam material is made of biodegradable PE material.

Images