Solid lubricating coating for seat belt plug-in parts and preparation method and spraying method thereof

Abstract

The present invention discloses a solid lubricating coating for a seat belt plug-in and a preparation method and a spraying method thereof. The coating is prepared from the following components by weight: 9-11 parts of epoxy resin, 0.5 parts of curing agent, 0.5 parts of hydrocarbon resin, 15-17 parts of organic solvent, 8-12 parts of lubricating powder, and 0.5 parts of other additives. The present invention uses epoxy resin as an adhesive, and the addition of solid lubricating powder can effectively improve the friction reduction and wear resistance of the coating; ultra-high molecular weight polyethylene can quickly flow to the pores of the coating film during the curing process of the coating to fill, improve the various properties of the defective parts, reduce the internal stress of the coating, and weaken the adverse performance effects caused by the difference in coating thickness.

Description

Technical Field

[0001] The invention relates to the field of solid lubricating coatings, in particular to a solid lubricating coating for a safety belt plug-in component and a preparation method and a spraying method thereof. Background Art

[0002] Automobile seat belt plug-in parts are mostly special-shaped metal steel parts. They need to be frequently plugged and unplugged during daily use, which will cause friction between the mating parts. This puts forward certain requirements for the wear resistance of the plug-in parts. The use of solid lubricating coating technology can greatly improve the wear resistance of the plug-in parts and at the same time have a good corrosion resistance effect.

[0003] However, it is difficult to form a good coating at the corners of special-shaped parts due to defects in the spraying angle. If the spraying is continued to increase the film thickness at the corners, the coating at other locations will be too thick, and the stress in the coating will increase. Once the toughness of the coating is abnormal, it is easy to crack or peel off, affecting the normal use of the plug-in parts. Summary of the invention

[0004] In view of this, the present invention provides a solid lubricating coating for a seat belt plug-in and a preparation method and a spraying method thereof to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention discloses a solid lubricating coating for a seat belt plug-in component, which is prepared from the following components in parts by weight:

[0007]

[0008] As a further solution of the present invention: the epoxy resin is a phenolic epoxy resin.

[0009] As a further solution of the present invention: the curing agent is a latent imidazole curing agent.

[0010] As a further embodiment of the present invention: the organic solvent is N-methylpyrrolidone.

[0011] As a further solution of the present invention: the lubricating powder is formed by mixing polytetrafluoroethylene, ultra-high molecular weight polyethylene, and plant fiber in a mass ratio of 6-8:1-2:1-2; and / or the plant fiber is one or more of sisal fiber, coconut shell fiber, and kapok fiber.

[0012] As a further solution of the present invention: the average particle size of the lubricating powder is not greater than 3 μm.

[0013] As a further solution of the present invention: the other auxiliary agent is at least one of a leveling agent and a dispersant.

[0014] In a second aspect, the present invention discloses a method for preparing the solid lubricating coating for the seat belt plug-in as described above, comprising the following steps:

[0015] Pour polytetrafluoroethylene, ultra-high molecular weight polyethylene, and epoxy resin curing agent into a powder mixer in order according to the ratio and mix them evenly to obtain component A;

[0016] The organic solvent is divided into two parts, and other additives, epoxy resin, and hydrocarbon resin are sequentially poured into a high-speed shear mixer containing the first part of the organic solvent and stirred evenly to obtain component B;

[0017] Add the plant fiber and the second part of the organic solvent into another stirrer and disperse them uniformly to obtain component C;

[0018] Pour component A and component C into component B, mix evenly and grind sufficiently to obtain a solid lubricating coating.

[0019] In a third aspect, the present invention discloses a method for spraying the solid lubricating coating for the seat belt plug-in component, comprising the following steps:

[0020] The coating is sprayed on the surface of the plug-in component by air spraying, and the plug-in component after spraying is placed in an environment of 125-135° C. for at least 1 hour to cure the coating on the surface of the plug-in component into a film; wherein the film thickness is 20-300 μm.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention uses F-51 epoxy resin as an adhesive and adds solid lubricating powder to effectively improve the friction reduction and wear resistance of the coating;

[0023] The UPE (ultra-high molecular weight polyethylene) material used in the present invention is a thermoplastic engineering plastic with a low melting point. It can quickly flow to the pores of the coating film to fill them during the curing process of the coating. Its huge molecular weight can improve the various properties of the defective parts, reduce the internal stress of the coating, and weaken the adverse performance effects caused by the difference in coating thickness.

[0024] The hydrocarbon resin used in the present invention, as a type of small molecule organic resin, will move and fill into the coating during the curing process of the coating, forming a dense organic film at the bottom of the coating, isolating the external corrosive medium from diffusing to the film-substrate interface, and enhancing the corrosion resistance of the coating;

[0025] The plant fiber material used in the present invention has low density and high specific surface area. It is difficult to quickly disperse it evenly when directly introduced into the mixed liquid. However, using a solvent to wet and disperse it first is more conducive to the fiber being evenly dispersed in the coating. In addition, with the ultra-high strength and toughness of the plant fiber material itself, the UPE material of the normal part and the defective part can be connected in the tangential direction of the workpiece surface, and the hydrocarbon resin organic film and coating can be connected in the direction perpendicular to the workpiece surface, thereby greatly improving the performance of the coating. The plant fiber material is green and environmentally friendly, and is in line with national environmental protection policies and industrial orientation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the microstructure of the coating in the present invention;

[0027] In the figure, 1-workpiece, 2-hydrocarbon resin, 3-epoxy resin, 4-plant fiber, 5-polytetrafluoroethylene, 6-ultra-high molecular weight polyethylene. DETAILED DESCRIPTION

[0028] For ease of understanding of the present invention, the present invention will be described more fully below in conjunction with specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0030] The specific information of the raw materials used in the following examples and comparative examples is as follows:

[0031] Epoxy resin, using F-51 epoxy resin, produced by Nantong Xingchen, brand F-51;

[0032] Curing agent: latent imidazole curing agent is used;

[0033] Organic solvent, N-methylpyrrolidone;

[0034] The plant fiber adopts kapok fiber;

[0035] Leveling agent: BYK310 leveling agent;

[0036] Dispersant: BYK220 dispersant;

[0037] All materials are commercially available common products.

[0038] It is to be understood that the above raw materials and reagents are only examples of some specific embodiments of the present invention, so that the technical solution of the present invention is clearer, and it does not mean that the present invention can only use the above reagents, and the specific scope in the claims shall prevail. In addition, the "parts" described in the examples and comparative examples, unless otherwise specified, refer to parts by weight.

[0039] Any range described in the present invention includes the end value and any numerical value between the end values ​​and any sub-range formed by the end value or any numerical value between the end values.

[0040] Preparation Examples 1-3 and Comparative Example 1 were prepared according to the following method:

[0041] Step 1: Weigh each component according to the ratio in Table 1 below, pour PTFE, UPE and curing agent into a powder mixer in sequence and mix evenly to obtain component A;

[0042] Step 2: Pour the leveling agent, dispersant, epoxy resin and hydrocarbon resin into a high-speed shear mixer containing 15 parts of organic solvent in order according to the proportions and stir evenly to obtain component B;

[0043] Step 3, adding the plant fiber separately into another blender, adding it into the remaining organic solvent and dispersing it evenly to obtain component C;

[0044] Step 4: Pour component A and component C into component B respectively and mix them. Grind and disperse them in a grinder for 60 minutes. Adjust the rotation speed of the grinder to 3000 rpm to obtain a solid lubricating coating.

[0045] Table 1

[0046]

[0047]

[0048] The only difference between Preparation Example 1 and Preparation Example 1 is that the hydrocarbon resin in Preparation Example 1 is replaced by an equal amount of epoxy resin.

[0049] Compared with Preparation Example 1, the only difference between Preparation Example 2 and Preparation Example 1 is that the lubricating powder of Preparation Example 2 is mixed with PTFE and plant fiber in a mass ratio of 6.75:2.25.

[0050] The only difference between Preparation Example 3 and Preparation Example 1 is that the lubricating powder of Preparation Example 3 is prepared by mixing PTFE and UPE in a mass ratio of 6.75:2.25.

[0051] Example 1

[0052] The solid lubricating coating obtained in Preparation Example 1 was sprayed on a workpiece (seat belt plug-in part), and after spraying, the workpiece was placed at 130° C. for 1 hour to allow the coating on the workpiece surface to solidify into a film. The thickness of the film after solidification was measured to be 20 μm.

[0053] Example 2

[0054] The solid lubricating coating obtained in Preparation Example 1 was sprayed on a workpiece (seat belt plug-in part), and after spraying, the workpiece was placed at 130° C. for 1 hour to allow the coating on the workpiece surface to solidify into a film. The thickness of the film after solidification was measured to be 300 μm.

[0055] Comparative Example 1

[0056] The solid lubricating coating obtained in Comparative Example 1 was sprayed on a workpiece (seat belt plug-in part), and after spraying, the workpiece was placed at 130° C. for 1 hour to allow the coating on the workpiece surface to solidify into a film. The thickness of the film after solidification was measured to be 20 μm.

[0057] Comparative Example 2

[0058] The solid lubricating coating obtained in Comparative Example 2 was sprayed on a workpiece (seat belt plug-in part), and after spraying, the workpiece was placed at 130° C. for 1 hour to allow the coating on the workpiece surface to solidify into a film. The thickness of the film after solidification was measured to be 20 μm.

[0059] Comparative Example 3

[0060] The solid lubricating coating obtained in Comparative Example 3 was sprayed on a workpiece (seat belt plug-in part), and after spraying, the workpiece was placed at 130° C. for 1 hour to allow the coating on the workpiece surface to solidify into a film. The thickness of the film after solidification was measured to be 20 μm.

[0061] Performance comparison

[0062] The coated seat belt plugs in the above embodiments and comparative examples were subjected to friction and wear, scratching, impact, salt spray and other tests, and the test results are shown in Table 2.

[0063] Among them, the cross-cut, impact and salt spray tests are carried out in accordance with GB / T 9286-2021 "Scratch test for paints and varnishes", GB / T 1732-2020 "Determination of impact resistance of paint films", and GB / T 10125-2021 "Artificial atmosphere corrosion test salt spray test". The friction and wear test uses a pin-on-disc friction and wear tester, and the test conditions are: load of 5N, reciprocating speed of 600r / min, wear time of 60min, and lubrication form of dry friction.

[0064] Table 2

[0065]

[0066] It can be seen from Table 2 above that, under the premise of ensuring that the composition of the lubricating layer is basically consistent, through performance comparison, it can be found that the performance level of Example 1 is basically the same as that of Example 2, and the performance is not weakened due to the thickening of the coating, which can meet the requirements of thick film coating in some parts of the parts.

[0067] On the other hand, in Comparative Examples 1, 2 and 3, the components of hydrocarbon resin, UPE and plant fiber were reduced respectively, so that the coatings showed different degrees of performance weakening in terms of adhesion, toughness and salt spray corrosion.

[0068] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0069] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A solid lubricating coating for a seat belt plug-in, characterized in that: It is prepared from the following components in parts by weight:

2. The solid lubricating coating for a seat belt plug-in according to claim 1, characterized in that: The epoxy resin is a phenolic epoxy resin.

3. The solid lubricating coating for a seat belt plug-in according to claim 1, characterized in that: The curing agent is a latent imidazole curing agent.

4. The solid lubricating coating for a seat belt plug-in according to claim 1, characterized in that: The organic solvent is N-methylpyrrolidone.

5. The solid lubricating coating for a seat belt plug-in according to claim 1, characterized in that: The lubricating powder is formed by mixing polytetrafluoroethylene, ultra-high molecular weight polyethylene and plant fiber in a mass ratio of 6-8:1-2:1-2; and / or the plant fiber is one or more of sisal fiber, coconut shell fiber and kapok fiber.

6. The solid lubricating coating for a seat belt plug-in according to claim 1, characterized in that: The average particle size of the lubricating powder is no greater than 3 μm.

7. The solid lubricating coating for a seat belt plug-in according to claim 1, characterized in that: The other auxiliary agent is at least one of a leveling agent and a dispersant.

8. A method for preparing a solid lubricating coating for a seat belt plug-in as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: Pour polytetrafluoroethylene, ultra-high molecular weight polyethylene, and epoxy resin curing agent into a powder mixer in order according to the ratio and mix them evenly to obtain component A; The organic solvent is divided into two parts, and other additives, epoxy resin, and hydrocarbon resin are sequentially poured into a high-speed shear mixer containing the first part of the organic solvent and stirred evenly to obtain component B; Add the plant fiber and the second part of the organic solvent into another stirrer and disperse them uniformly to obtain component C; Pour component A and component C into component B, mix evenly and grind sufficiently to obtain a solid lubricating coating.

9. The method for spraying a solid lubricating coating for a seat belt plug-in according to any one of claims 1 to 8, characterized in that: The following steps are involved: The coating is sprayed on the surface of the plug-in component by air spraying, and the plug-in component after spraying is placed in an environment of 125-135° C. for at least 1 hour to cure the coating on the surface of the plug-in component into a film; wherein the film thickness is 20-300 μm.

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