Environment-friendly closed sealing ring and preparation method thereof

Abstract

The invention discloses an environment-friendly closed sealing ring and a preparation method thereof, and belongs to the field of mechanical sealing elements, and the environment-friendly closed sealing ring comprises the following substances in parts by weight: 72 parts of bio-based high polymer material particles, 8 parts of microcapsule powder, 15 parts of a plasticizer and 5 parts of a reinforcing agent. The method has the advantages that 1, the excellent environmental protection property is realized: greenization is realized from the source, a renewable bio-based material is adopted, the dependence on fossil resources is reduced, after the service life of a product is ended, the bio-based matrix and the microcapsule wall material can be biodegraded under specific conditions such as industrial composting, or the material recovery is realized in a melting reconstruction manner, and the environment-friendly property is realized; the full-life-cycle environment friendliness is really realized; the service life is ultra-long, intelligent supply is achieved through a closed self-lubricating core, the problems that a traditional lubricating agent is prone to loss and needs to be supplemented frequently are solved, the abrasion speed of a sealing ring is greatly reduced through continuous and effective lubrication, and the service life of the sealing ring can be prolonged by 2-3 times compared with that of a traditional product.

Description

Technical Field

[0001] This invention belongs to the field of mechanical sealing elements, specifically an environmentally friendly closed sealing ring and its preparation method. Background Technology

[0002] Sealing rings are basic components widely used in hydraulic and pneumatic systems, pipe connections, and mechanical equipment. Their function is to prevent fluid or solid particles from leaking between adjacent mating surfaces and to prevent external impurities such as dust and moisture from entering the interior of machinery and equipment. Currently, most sealing rings on the market are made of synthetic rubber materials such as nitrile rubber, fluororubber, and EPDM rubber.

[0003] However, these traditional sealing rings have the following significant drawbacks: 1. Environmental pollution issues: The raw materials for its production mainly come from non-renewable petroleum resources. The production process is energy-intensive and generates a large amount of carbon emissions. After the products are discarded, these synthetic rubbers are chemically stable and extremely difficult to degrade in the natural environment, forming "white pollution" and causing long-term harm to soil and water sources.

[0004] 2. Performance limitations: Traditional rubber seals have a relatively high coefficient of friction. In dynamic sealing applications, they are prone to generating large amounts of frictional heat, which leads to accelerated aging, wear, and even ablation of the material. This shortens the service life of the seals and increases equipment maintenance costs and downtime risks.

[0005] 3. Lubrication dependency: To reduce friction and wear, additional grease or oil is usually required. This not only increases the number of steps, but also makes the lubricant prone to leakage, contaminating the working medium (food, pharmaceuticals), and attracting dust and impurities, affecting the sealing effect and equipment cleanliness.

[0006] In recent years, although some sealing rings using engineering plastics or modified rubber have emerged, improving wear resistance to some extent, fundamental breakthroughs have not yet been achieved in terms of the environmental friendliness of material sources, the remanufacturability after disposal, and the realization of long-term self-lubrication. Therefore, developing a sealing ring that possesses both excellent sealing performance and long service life, while also conforming to the concepts of green environmental protection and sustainable development, has become an urgent technical problem to be solved in this field. Summary of the Invention

[0007] This invention provides an environmentally friendly closed sealing ring and its preparation method to overcome the defects in the prior art.

[0008] This invention is achieved through the following technical solution: An environmentally friendly closed sealing ring comprises the following substances in parts by weight: 72 parts of bio-based polymer material particles, 8 parts of microcapsule powder, 15 parts of plasticizer, and 5 parts of reinforcing agent.

[0009] As described above, the environmentally friendly closed sealing ring is made of any one or a mixture of any two or more of the following: bio-based nylon, bio-based thermoplastic polyurethane, polylactic acid, and polyhydroxyalkanoates, in any proportion.

[0010] As described above, the environmentally friendly closed sealing ring has a microcapsule powder with a particle size of 1-50 μm. The preparation process of the microcapsule powder is as follows: using in-situ polymerization or interfacial polymerization, with a solid lubricant as the core and a heat-sensitive or pressure-sensitive bio-based polymer as the wall material, the microcapsule powder is prepared.

[0011] In the environmentally friendly closed sealing ring described above, the mass ratio of the solid lubricant to the heat-sensitive or pressure-sensitive bio-based polymer is 5:3.

[0012] The environmentally friendly closed sealing ring described above uses a solid lubricant that is any one or a mixture of any two or more of graphene, molybdenum disulfide, polytetrafluoroethylene micro powder, and boron nitride in any proportion.

[0013] The environmentally friendly closed sealing ring described above uses a bio-based polyester monomer as the heat-sensitive or pressure-sensitive bio-based polymer.

[0014] The aforementioned environmentally friendly closed sealing ring uses tributyl citrate as the plasticizer.

[0015] The aforementioned environmentally friendly closed sealing ring uses flax fiber or bamboo fiber as the reinforcing agent.

[0016] A method for preparing an environmentally friendly closed-loop sealing ring includes the following steps: Step 1: Weigh out the bio-based polymer material particles, microcapsule powder, plasticizer, and reinforcing agent according to the specified ratio; Step 2: Bio-based polymer material particles, microcapsule powder, plasticizer, and reinforcing agent will be fed into a high-speed mixer and mixed for 15 minutes; Step 3: Add the blended material to the injection molding machine, set the barrel temperature to 220-240℃ and the mold temperature to 60℃, and inject the O-ring blank. Step 4: Anneal the O-ring blank in an oven at 90℃ for 2 hours to eliminate the internal stress generated by injection molding, and finally obtain the finished product.

[0017] The advantages of this invention are: 1. Excellent environmental protection attributes: Greening from the source, using renewable bio-based materials to reduce dependence on fossil resources. After the product's lifespan, the bio-based matrix and microcapsule wall material can be biodegraded under specific conditions such as industrial composting, or recycled through melting and remanufacturing, truly achieving environmental friendliness throughout the entire life cycle. 2. Extended service life: The closed self-lubricating core achieves "intelligent replenishment", solving the pain points of traditional lubricants being prone to loss and requiring frequent replenishment. Continuous and effective lubrication greatly slows down the wear rate of the sealing ring, extending its service life by 2-3 times compared to traditional products, reducing the user's maintenance frequency and overall costs. 3. High applicability and cleanliness: Since the lubricant is sealed inside, it will not contaminate the surrounding medium, making this invention particularly suitable for industries with extremely high cleanliness requirements, such as food processing, pharmaceutical manufacturing, and semiconductors. Its "release on demand" characteristic also makes it stable under complex working conditions such as wide temperature range, variable speed, and variable load. 4. Significant improvement in overall performance: Bio-based materials themselves have good oil resistance, water resistance and weather resistance. Combined with the reinforcement of natural fibers, the sealing ring maintains high elasticity while ensuring mechanical strength and extrusion resistance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the product of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] An environmentally friendly closed sealing ring comprises the following substances in parts by weight: 72 parts of bio-based polymer material particles, 8 parts of microcapsule powder, 15 parts of plasticizer, and 5 parts of reinforcing agent.

[0022] Preferably, the bio-based polymer material particles described in this embodiment are any one or a mixture of any two or more of the following: bio-based nylon, bio-based thermoplastic polyurethane, polylactic acid, and polyhydroxyalkanoates, in any proportion.

[0023] Preferably, the microcapsule powder described in this embodiment has a particle size of 1-50 μm, and the preparation process of the microcapsule powder is as follows: using in-situ polymerization or interfacial polymerization, with a solid lubricant as the core and a heat-sensitive or pressure-sensitive bio-based polymer as the wall material, microcapsule powder is prepared.

[0024] Preferably, the mass ratio of the solid lubricant to the heat-sensitive or pressure-sensitive bio-based polymer described in this embodiment is 5:3.

[0025] Preferably, the solid lubricant described in this embodiment is any one or a mixture of any two or more of graphene, molybdenum disulfide, polytetrafluoroethylene micro powder, and boron nitride in any proportion.

[0026] Preferably, the thermosensitive or pressure-sensitive bio-based polymer described in this embodiment is a bio-based polyester monomer.

[0027] Preferably, the plasticizer described in this embodiment is tributyl citrate.

[0028] Preferably, the reinforcing agent described in this embodiment is flax fiber or bamboo fiber.

[0029] A method for preparing an environmentally friendly closed-loop sealing ring includes the following steps: Step 1: Weigh out the bio-based polymer material particles, microcapsule powder, plasticizer, and reinforcing agent according to the specified ratio; Step 2: Bio-based polymer material particles, microcapsule powder, plasticizer, and reinforcing agent will be fed into a high-speed mixer and mixed for 15 minutes; Step 3: Add the blended material to the injection molding machine, set the barrel temperature to 220-240℃ and the mold temperature to 60℃, and inject the O-ring blank. Step 4: Anneal the O-ring blank in an oven at 90℃ for 2 hours to eliminate the internal stress generated by injection molding, and finally obtain the finished product.

[0030] Working principle When the O-ring is installed in the groove of the rotating shaft and forms a dynamic seal with the housing, the microcapsules remain intact within the matrix in a static state. When the shaft begins to rotate, friction occurs on the surface in contact with the O-ring, causing a rapid rise in local temperature. When the temperature reaches or exceeds 80°C, the wall material of the microcapsules softens and ruptures, releasing the internal graphene lubricant, which is then transferred to the contact interface between the shaft and the O-ring, forming a lubrication transfer film. This film significantly reduces the coefficient of friction, minimizing wear and thus protecting both the seal itself and the mating shaft surface, achieving a long-lasting and reliable seal.

[0031] Example Step 1: Weigh out 72 parts of bio-based nylon PA1010 granules, 8 parts of microcapsule powder, 15 parts of tributyl citrate, and 5 parts of flax fiber according to the specified ratio. The preparation process of the microcapsule powder is as follows: graphene powder is dispersed in an aqueous solution of bio-based polyester monomers, with a mass ratio of graphene powder to bio-based polyester monomers of 5:3. The bio-based polyester monomers undergo a polymerization reaction on the graphene surface to form a dense polymer coating layer, i.e., wall material. After filtration, washing, and drying, capsule powder is obtained. Step 2: Bio-based polymer material particles, microcapsule powder, tributyl citrate, and flax fiber will be fed into a high-speed mixer and mixed for 15 minutes; Step 3: Add the blended material to the injection molding machine, set the barrel temperature to 230℃ and the mold temperature to 60℃, and inject the O-ring blank. Step 4: Anneal the O-ring blank in a 90℃ oven for 2 hours to eliminate the internal stress generated during injection molding, finally obtaining the finished product (its structure is as follows). Figure 1 (As shown).

[0032] The environmentally friendly closed sealing ring prepared in this embodiment of the invention has been tested and found to have a Shore hardness of 75-80D, a tensile strength of over 25MPa, an elongation at break of over 300%, and a coefficient of friction reduced to below 0.15. After 1000 hours of dynamic friction testing, the wear amount is only 1 / 3 of that of traditional nitrile rubber sealing rings, fully meeting the dual requirements of environmental protection and long service life.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An environmentally friendly closed-loop sealing ring, characterized in that: The substance comprises the following parts by weight: 72 parts of bio-based polymer material particles, 8 parts of microcapsule powder, 15 parts of plasticizer, and 5 parts of reinforcing agent.

2. The environmentally friendly closed sealing ring according to claim 1, characterized in that: The bio-based polymer material particles are any one or a mixture of any two or more of the following: bio-based nylon, bio-based thermoplastic polyurethane, polylactic acid, and polyhydroxyalkanoates, in any proportion.

3. The environmentally friendly closed sealing ring according to claim 1, characterized in that: The microcapsule powder has a particle size of 1-50 μm, and the preparation process of the microcapsule powder is as follows: using in-situ polymerization or interfacial polymerization, with a solid lubricant as the core and a heat-sensitive or pressure-sensitive bio-based polymer as the wall material, microcapsule powder is prepared.

4. The environmentally friendly closed sealing ring according to claim 3, characterized in that: The solid lubricant and the heat-sensitive or pressure-sensitive bio-based polymer are in a mass ratio of 5:

3.

5. The environmentally friendly closed sealing ring according to claim 3, characterized in that: The solid lubricant is any one or a mixture of any two or more of graphene, molybdenum disulfide, polytetrafluoroethylene micro powder, and boron nitride in any proportion.

6. The environmentally friendly closed sealing ring according to claim 3, characterized in that: The heat-sensitive or pressure-sensitive bio-based polymer is a bio-based polyester monomer.

7. The environmentally friendly closed sealing ring according to claim 1, characterized in that: The plasticizer mentioned is tributyl citrate.

8. The environmentally friendly closed sealing ring according to claim 1, characterized in that: The reinforcing agent is flax fiber or bamboo fiber.

9. A method for preparing an environmentally friendly closed-loop sealing ring, characterized in that: Including the following steps: Step 1: Weigh out the bio-based polymer material particles, microcapsule powder, plasticizer, and reinforcing agent according to the specified ratio; Step 2: Bio-based polymer material particles, microcapsule powder, plasticizer, and reinforcing agent will be fed into a high-speed mixer and mixed for 15 minutes; Step 3: Add the blended material to the injection molding machine, set the barrel temperature to 220-240℃ and the mold temperature to 60℃, and inject the O-ring blank. Step 4: Anneal the O-ring blank in an oven at 90℃ for 2 hours to eliminate the internal stress generated by injection molding, and finally obtain the finished product.

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