TWM617592U - The self lubricant seal with a lubricant surface layer which contained graphene component - Google Patents

Abstract

The present model discloses a sealing member composed of a polymer containing graphene material components to form an outer surface layer and an inner entity made of rubber. Its characteristics have excellent self-lubricating and wear resistance properties, which are especially suitable for rubber seals that require sports. A self-lubricating seal made by improving the surface properties of the original rubber. The main process is to spray the surface of the traditional rubber seal with a surface friction layer with a thickness of 0.1-100u, which greatly improves the performance of the seal, and can be used more effectively for the dynamic seal of pneumatic cylinders and hydraulic cylinders. ); Main occasions are used for parts in various occasions that are in contact with metal and move frictionally. The graphene is evenly and effectively dispersed in the carrier. The graphene content can be from 0.01% to 20% (relative to the total weight of the total resin formula 100%) depending on the application function standard to adjust the different friction coefficient and lubricity of the object. After processing the surface of the seal, it is covered with a layer of lubricating and wear-resistant layer, which can greatly improve the lubricity of the seal, reduce the friction and wear of the seal in motion, and can operate stably for a long time, effectively extending the pneumatic and oil pressure And so on, the life of each element of linear motion, rotation and various motions in various fields, and reduce the energy consumption during work.

Description

Self-lubricating seal with graphene component surface layer

This new model discloses the manufacture and application of a new type of high-lubricity seal, which is provided for various components such as hydraulic system (hydaulic), pneumatic system (pneumatic) or shock absorber, including various linear motion or rotary motion machinery. The seal is used. This seal utilizes the high lubricity characteristics of Graphene, and only changes the surface performance of the seal, which can greatly reduce the friction coefficient and improve the wear resistance, which can enable start-up energy consumption and stable movement The energy consumption of time is greatly reduced, and the service life of the seal is prolonged at the same time.

Most of the seal materials in the prior art are traditional vulcanized rubber or thermoplastic rubber, but the friction coefficients of the above two are very high. Therefore, when performing linear or rotary motions, more power is required. At the same time, due to the friction coefficient Very high, resulting in a lot of wear. Within a certain period of time, air leakage or oil leakage will occur, causing seals to fail, and new seals must be replaced soon, so it is very important to reduce the friction coefficient and wear resistance of the seals. Subject.

In the past, the lubricity of seals was increased. The general practice is to add highly lubricating material components, such as paraffin, Teflon, graphite or molybdenum disulfide powder, when compounding rubber seals. But the effect is not very good; paraffin wax mainly spits frost through the rubber, which transfers to the surface of the seal to increase the surface smoothness, but when the use temperature gradually rises, the surface wax gradually softens and peels off, and the effect becomes bad. Other types of lubricants have poor compatibility with rubber and poor dispersibility, resulting in unsatisfactory effects.

Graphene nanomaterials have a relatively low coefficient of friction, so adding graphene nanomaterials to the usual seal rubber formulations can effectively reduce the friction coefficient of the seals. It is also one of the solutions to become a self-lubricating seal. However, graphene nanomaterials are quite expensive. Because graphene is not compatible with rubber and does not disperse well, in addition, a large ratio must be added to the formulation to produce the desired effect and increase the cost. Therefore, how to break through this bottleneck is an important issue.

The seal referred to in the content of the present invention is a closed curve ring on a two-dimensional geometric plane (such as a circle); while in the third three-dimensional height, different cross-sectional shapes are designed to meet the sealing requirements in response to various contact environments (such as: The cross-sectional view of Figure 1), to achieve a good sealing effect, because the elastic tightness of the material is large enough, the outer lip of the seal in Figure 1 can be used to contact and seal the metal part of the cylinder wall, or The inner lip in Figure 1 can be used to produce a contact seal with the metal shaft part, but because the lip rubber and the metal part are rubbed during the movement, the untreated traditional seal is easy to rub under the condition of high friction coefficient. Abrasion occurs, causing damage to the seals, air leakage or oil leakage, resulting in failure and failure.

This new model discloses the structural composition and application of a new type of self-lubricating seal. It is to first prepare a highly lubricating material containing graphene to make a paint that can be sprayed and processed. It is sprayed on the surface of the seal to improve the performance of the surface layer of the seal, so it can effectively reduce the friction during the grinding movement, and can use lower pressure or energy to drive and operate, and it also has low wear resistance. , So the service life of the seal can be relatively extended.

This coating composition includes two kinds: thermosetting and thermoplastic.

1. Thermosetting: Mainly contain 30-80% thermosetting resin (resin), 6-50% hardener, 1-10% graphene (Graphene), after mixing, add 10-55% organic solvent, and dilute to 50- 300cps viscosity, making it more suitable for spraying viscosity.

After stirring and dispersing evenly, use a spray gun to spray the paint on the rubber seal. The thickness of the surface spraying is about 0.1-100u, and then the sprayed seal is placed in an oven and baked at a temperature of 80°C for 1 hour. The system used can be a hydroxyl-terminated PU (polyurethane) prepolymer main material and isocyanate functional group (isocyate) end cross-linking hardener system; or epoxy resin (Epoxy) main material and matching polyamine hardener system; or Phenolic resin (phenol-formaldehyde resin) system, or unsaturated resin (Unsaturated Polyester Resin) system.

2. Thermoplasticity: It mainly contains 30-80% of thermoplastic resin (resin), 1-10% of graphene (Graphene), and 10-55% of organic solvent. After mixing, it is diluted to 50-300cps viscosity with organic solvent to make it It is more suitable for spraying viscosity. After spraying with a spray gun on the rubber seal, it is dried in an oven. The thermoplastic resin system can be modified polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF) series fluoroplastics, or polyether imide (PEI), polyimide (PI), thermoplastic polyester (TPU) )...And other plastics. The solvent mentioned above can be toluene, xylene, ethylbenzene, tetramethylbenzene, dimethyl formamide (Dimethyl formamide, DMF), butanone (Methyl Ethyl Ketone, MEK), tetrahydrofuran (tetrahydrofuran, THF), acetic acid Butyl acetate, acetic acid Ethyl (ethyl acetate)... and other organic solvents.

(10): Seal

(100): Outer surface layer

(101): Outer lip

(102): inner lip

(20): Seal

(201): Outer lip

(202): inner lip

(30): Inner body layer

[Figure 1] is a cross-sectional view of the entire surface of the sealing member sprayed with graphene components.

[Figure 2] is a cross-sectional view of the inner and outer lip parts sprayed with graphene-containing components.

Generally, according to the present model, the best feasible embodiment is described in detail in conjunction with Figures 1 and 2 to increase the understanding of this patent; Firstly, 1-10 layers of graphene with a thickness of 1-10g are put into 30-80g of PU resin, hardener, 6-50g of isocyanated glycerin, mixed and dispersed, and diluted to 50-300cps with 10-55g of organic solvent After mixing and dispersing the viscosity again, use a spray gun to spray the coating on the NBR seal with a thickness of 10-100u. Then put the seal into the oven, the baking temperature is 80°C, and the baking time is 1 hour.

The finished product was compared with the unsprayed sample for ASTM-D1894 friction test. The result was: dynamic friction coefficient: 0.79 for unsprayed and 0.16 after sprayed. Static friction coefficient: 3.01 without spraying and 0.242 after spraying. Obviously, the method of the present invention is quite effective. After the new treatment, the static friction coefficient can be reduced by 14-15 times, and the dynamic friction coefficient can be reduced by more than 5 times.

Spraying the graphene layer to greatly reduce the friction coefficient of the seal and greatly increase the service life is one of the applications for this new model. It is also well known that lip seals use structural outer lips (101, 201), or inner lips (102, 202) to closely adhere to the contacting metal surface, and use rubber elasticity. Features to achieve the sealing effect. The outer lip (101, 201) is mainly used to seal the piston part, and the inner lip (102, 202) is mainly used to seal the shaft center, so the entire seal (10, 20) is sealed, especially the lip Department. Therefore, it is not necessary for the overall seal structure to have graphene. As long as the key contact parts have a large degree of lubrication, the pressure burden during exercise can be improved and the same effect. Therefore, the new model advocates the seal (10, 20) lip , Local spraying can reduce the coefficient of friction. The black part of Figure 2 shows that the lip part is partially sprayed with ingredients containing graphene components, and the other white parts are not sprayed, saving materials, processes and costs.

Continuing the above-mentioned structure of the sealing member (10, 20) includes: an inner body layer (30) and an outer surface layer (100), the inner body layer (30) is arranged inside the sealing member (10, 20), and The outer surface layer (100) is arranged outside the sealing member (10, 20), and the cross-sectional shape of the inner body layer (30) includes any one of O-shaped, X-shaped, V-shaped, and U-shaped. The sealing member ( The outer surface layer (100) of 10) is formed by spraying. The thickness of the outer surface layer (100) is 0.1-100 microns, and the surface layer contains 0.01% to 20% graphene; the inner body layer (30) is more at least An outer lip (101, 201) is formed; an inner lip (102, 202) is spaced apart from the outer lip (101, 201).

The inner body layer (30) is a rubber body, which can be nitrile butadiene rubber (NBR), hydrogenated nitrile butadiene rubber (HNBR), fluoro rubber (FKM), neoprene One of (chloroprene rubber, CR), polyacrylate rubber (ACM), Q (silicon rubber), and TPU (Thermoplastie polyurethanes); and the main material of the outer layer (100) must be heated One of the solid resin systems, polyurethane (Polyurethane, PU) main material and hardener isocyanated glycerin, or unsaturated resin main material (unsaturated polyester resin) and its crosslinking agent Methyl Ethyl Ketone Peroxide (MEKPO) system , Or epoxy resin main material (epoxy resin) and its hardening system, phenolic resin main material and its hardening agent system.

(10): Seal

(100): Outer surface layer

(101): Outer lip

(102): inner lip

(30): Inner body layer

Claims (6)

A self-lubricating sealing element containing a graphene component surface layer, comprising: a sealing element (10) having an inner body layer (30) and an outer surface layer (100), and the inner body layer (30) is arranged on the sealing element (10) Inside, and the outer surface layer (100) is arranged outside the sealing member (10), the outer surface layer (100) is formed by spraying, and the thickness of the outer surface layer (100) is 0.1-100 microns (Micrometer, u), and the outer surface layer (100) contains 0.01% to 20% of graphene content; the inner body layer (30) further forms at least an outer lip (101, 201); an inner lip (102, 202), then The outer lips (101, 201) are spaced apart from each other. For the self-lubricating seal with a graphene component surface layer as described in claim 1, the inner body layer (30) is a rubber body, which can be nitrile butadiene rubber (NBR), hydrogenated nitrile rubber (hytrogenated nitrile) butadiene rubber (HNBR), fluoro rubber (FKM), chloroprene rubber (CR), polyacrylate rubber (ACM), Q (silicon rubber), thermoplastic polyurethane TPU (Thermoplastic polyurethanes) One of a kind. For the self-lubricating seal with a surface layer containing graphene as described in claim 1, the main material of the outer surface layer (100) must be one of the following thermosetting resin systems, polyurethane (Polyurethane, PU) main material and hardened Isocyanate glycerol, or unsaturated polyester resin and its crosslinking agent Methyl Ethyl ketone Peroxide (MEKPO) system, or epoxy resin and its hardening system, phenolic resin Resin main material and its hardener system. The self-lubricating seal with a graphene component surface layer as described in claim 1, wherein the seal (10) can be used in various components such as hydraulic systems, pneumatic systems, and shock absorbers, including various linear motions, And the seal in the rotating motion. The self-lubricating seal containing the surface layer of graphene as described in claim 1, the seal The graphene component in the piece (10) can be spray-molded on the outer lip (101, 201) and the inner lip (102, 202), or it can be formed by the outer lip (101, 201) and the Use one of the inner lips (102, 202). According to claim 1 of the self-lubricating seal containing a graphene component surface layer, the cross-sectional shape of the inner body layer (30) includes any of O-shaped, X-shaped, V-shaped, and U-shaped.

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