CN1328360C - Powder coating type composite solid lubricant film preparation method and gear wheel with solid lubricant film - Google Patents

Abstract

The invention relates to a powder coating type composite solid lubricating film, a preparation method thereof and a solid lubricating film gear. The solid lubricating film of the present invention forms a three-layer composite solid lubricating film on the metal base material. It forms a chemical base film by chemical reaction on the surface of the metal base material after surface cleaning treatment. The solid lubricant is rubbed to form the second transition layer, and the polymer powder type outer surface coating is sprayed on the second transition layer. The solid lubricating film has the characteristics of good lubricating effect, wear resistance and long service life. It is simple to manufacture and easy to operate, and is especially suitable for manufacturing solid lubricating film gears, and is also suitable for various mechanical friction components and parts requiring proper protection.

Description

Powder coating type composite solid lubricating film and its preparation method and solid lubricating film gear

technical field

The invention belongs to the technical field of lubrication, in particular to a powder coating type solid lubricating film and a preparation method thereof.

Background technique

Dry film lubrication is a technique in which solid lubricants, wear-resistant additives, etc. are firmly bonded to the moving friction surface by means of a binder to play a protective role in wear-resistant lubrication. The material forming a solid lubricating dry film is called a dry film lubricant. The dry film formed by the dry film lubricant can act as a solid lubricating film under dry friction conditions, and can also be used together with lubricating oil, grease, and paste, as well as an anti-corrosion protective film. It is also used for repairing or The surface is anti-adhesive and anti-fouling (dirt), etc. It has been widely used in friction parts and parts requiring proper protection in aerospace, aviation, machinery, transportation, electronics, construction, petrochemical, shipbuilding and other industrial sectors.

Dry film lubricants mostly use polymer binders. At present, polymer binder resins are often dissolved in organic solvents, and then various auxiliary materials are added, including solid lubricants and wear-resistant additives. The liquid forms a 10-60 μm thick coating on the surface of the friction parts through various construction methods (spraying, brushing, dipping), and forms a dry film after curing at a certain temperature. However, the existing dry film lubricants have problems such as high concentration of organic volatiles and poor solid lubricating effect and wear life of the dry film.

Contents of the invention

The object of the present invention is to provide a kind of powder coating type composite solid lubricating film and preparation method thereof, overcome the problem that the organic volatile matter concentration of the dry film lubricant of the prior art is high, make the solid lubricating film of the present invention have lubricating effect good, durable Grinding, long life and other characteristics. The invention also provides a gear using the solid lubricating film of the invention, which has better wear resistance and longer service life.

To achieve the above object, design of the present invention is:

In order to solve the problems of high organic volatile matter concentration and short dry film wear life of existing dry film lubricants, the invention provides a powder coating type composite solid lubricating film and a preparation method on the surface of gear parts.

The basic requirements of the bonded solid lubricating film are: (1) Excellent bonding performance with the metal substrate; (2) Good solid lubricating performance; (3) Good mechanical strength, especially the impact resistance at the moment of gear startup Performance; (4) Excellent coating process performance to ensure the smoothness and thickness of the film. The dry film lubricants currently used have the following disadvantages: (1) toxic and expensive organic solvents are required; (2) the utilization rate of the adhesive in the coating process is low; (3) storage and transportation are inconvenient. Powder coatings have attracted widespread attention due to their advantages of no pollution, resource saving and high efficiency. Thermosetting powder coatings are characterized by strong adhesion to metal substrates, high temperature resistance, and good leveling properties. At the same time, polymer resins not only play the role of binders, but also have self-lubricating properties. Mainly used epoxy resin, Polyester-epoxy, polyurethane, polyester, acrylic, polyester-acrylic and epoxy-acrylic, etc.

The macromolecular powder paint of the outer surface coating of the present invention is made of macromolecular resin, solidifying agent, solid lubricant, 3,5-di-tert-butyl-4 hydroxyphenyl propionate octadecyl alcohol ester, titanium dioxide, leveling agent, Benzoin and other components. Among them, the polymer resin is epoxy resin or polyester-epoxy composite resin or polyester resin, which is 30-85%, the curing agent is 3-40%, 3,5-di-tert-butyl-4 hydroxyphenyl Octadecyl propionate is 3-5%, leveling agent is 0.5-5%, benzoin is 0.2-1%, titanium dioxide and wollastonite are 3-25%, solid lubricant is 3-25%, Among them, molybdenum disulfide 0-20%, boron nitride 0-15%, barium borate 0-10%, graphite 0-10%, molybdenum powder 0-10%, molybdenum oxide 0-10%, PTFE (polytetrafluoroethylene) )0~10%.

Table 1 shows the mass wear rate of polyester, polyester-epoxy resin, and epoxy resin powder coating type composite solid lubricating film dry friction for 3 hours.

Exterior Coating Resin Type Wear rate (×10 ^-2 mg/h) polyester 4.35 Polyester-Epoxy 4.22 epoxy resin 4.24

Test parameter conditions: M-2000 wear testing machine, ring-ring rolling/sliding contact, sliding speed 0.793m/s,

The spindle speed is 200rpm, the line load is 10000N/m, and the dry friction test is 3h.

According to above-mentioned inventive concept, the present invention adopts following technical scheme:

A powder coating type composite solid lubricating film, comprising a lubricating film covering the surface of a metal substrate (1), characterized in that the lubricating film is a lubricating film composed of the following three layers of solid films:

(1) chemical film (2): the first transition layer, on the surface of the metal substrate (1), has a porous structure and solid lubricating properties;

(2) The second transition layer (3): a solid lubricant coating on the chemical film (2);

(3) Outer surface coating (4): polymer powder type outer surface coating on the second transition layer (3).

The chemical membrane (2) is a phosphate membrane.

The polymer powder-type outer surface coating (4) is formed by spraying a polymer powder coating, and the composition ratio of the polymer powder coating is as follows:

Polymer resin 30～85%

Curing agent 3～40%

Solid Lubricant 3～25%

3,5-di-tert-butyl-4-hydroxyphenyl propionate octadecyl alcohol 3～5%

Benzoin 0.2～1%

Leveling agent 0.5～5%

Titanium dioxide and silica lime 3～25%

The above-mentioned solid lubricant is any one of molybdenum disulfide, boron nitride, barium borate, graphite, molybdenum powder, molybdenum oxide and polytetrafluoroethylene or a mixture of several selected.

The above-mentioned polymer resin is a thermosetting polymer resin.

The above-mentioned thermosetting polymer resins are epoxy resins, polyester resins, and polyester/epoxy composite resins.

A method for preparing the above-mentioned powder coating type composite solid lubricating film, the preparation process steps are as follows:

(1) Metal substrate (1) Surface cleaning treatment: use degreasing and pickling methods to clean the surface;

(2) chemical conversion treatment to form a chemical film (2): a phosphate film is formed by a chemical reaction between the phosphating treatment solution and the metal surface;

(3) rubbing solid lubricant to form the second transition layer (3): rubbing the solid lubricant on the surface of the above-mentioned chemical film (2), the operating temperature is 50～150°C, and the temperature of the solid lubricant is 50 At ~150°C, the average diameter of solid lubricant particles is 1-4 μm.

(4) Spray polymer coating to form outer surface coating (4): on the second transition layer (3) surface, adopt high-voltage electrostatic spray gun to carry out electrostatic spraying described polymer powder coating, high temperature curing simultaneously, curing condition is 180 ~220°C, 10~30min.

A solid lubricating gear adopting the above-mentioned powder coating type composite solid lubricating film, the tooth table, addendum and dedendum of the gear are completely coated with lubricating film, which is characterized in that the described lubricating film is a powder coating type composite solid lubricating film, through The thickness of the solid lubricating film measured by measuring the common normal of the gear is 20-25 μm, and the tooth surface roughness Ra is 0.8-0.9 μm.

Compared with the prior art, the present invention has the following obvious outstanding features and significant advantages: the solid lubricating film of the present invention is composed of three layers of solid film, and first forms a chemical film with porous structure and solid lubricating properties on the metal surface through chemical reaction , so that the lubricating film can be firmly organically combined with the substrate; then the solid lubricant is rubbed by physical treatment and treated at high temperature to form the second transition layer; finally, the polymer powder type outer surface coating is sprayed on the second transition layer. The powder coating type composite solid lubricating film overcomes the problem of high concentration of organic volatiles in the prior art, thus has the characteristics of good lubricating effect, wear resistance, long service life, etc., and the preparation method is simple and easy to operate. The invention is most suitable for manufacturing solid lubricating film gears, and the invention is suitable for various mechanical friction components and parts requiring proper protection.

Description of drawings

Figure 1 is a schematic diagram of the structure of a powder coating type composite solid lubricating film.

Figure 2 is a schematic diagram of the partial structure of the solid lubricant film gear.

Fig. 3 is polyester, polyester-epoxy, epoxy powder coating type composite solid lubricating film dry friction friction coefficient curve, among the figure (a) is polyester, and figure (b) is polyester-epoxy resin, figure (c) is an epoxy resin.

Detailed ways

The following are examples of three powder coating type composite lubricating films and one solid lubricating film gear:

Embodiment 1: Refer to figure (a) of Fig. 1 and Fig. 3 .

Carry out chemical film treatment on the ring surface of the steel ring whose material 1 is 40Cr to form a phosphating layer 2 with a thickness of 6-10 μm, and then rub one or several solid lubricants on the surface of the first transition layer to form a phosphating layer 2 with a thickness of 3-5 μm Thick second transition layer3. A polyester powder coating type solid lubricating film 4 with a thickness of 20-50 μm is coated on the annulus by means of electrostatic spraying and high-temperature curing. The curing conditions are: 180~220°C, 10~30min. In terms of mass percentage in the coating, the polyester resin CC440 is 30-85%, the curing agent TGIC is 3-40%, and the 3,5-di-tert-butyl-4-hydroxyphenyl octadecyl propionate is 3-5%. %, silicone leveling agent is 0.5-5%, benzoin is 0.2-1%, titanium dioxide and wollastonite are 3-25%, solid lubricant is molybdenum disulfide 3-20%, boron nitride 0-15% %, barium borate 0-10%, graphite 0-10%, molybdenum powder 0-10%, molybdenum oxide 0-10%, PTFE 0-10%. Ring-ring rolling/sliding contact dry friction and wear, under the conditions of sliding speed 0.793m/s and line load 10000N/m, the friction coefficient still remains at about 0.13 after 3 hours of testing, and the composite solid lubricating film remains intact.

Embodiment 2: Refer to figure (c) of Fig. 1 and Fig. 3 .

Chemical film treatment is carried out on the ring surface of the steel ring whose material 1 is 40Cr to form a phosphating layer 2 with a thickness of about 6-10 μm, and then one or several solid lubricants are applied on the surface of the first transition layer to form 3- 5 μm thick second transition layer 3 . A 20-50 μm thick epoxy resin powder coating type solid lubricating film 4 is coated on the ring surface by means of electrostatic spraying and high-temperature curing. The curing conditions are: 180~220°C, 10~30min. In terms of mass percentage, epoxy resin E12 is 30-85%, curing agent 284 is 3-40%, and 3,5-di-tert-butyl-4-hydroxyphenyl propionate is 3-5%. %, silicone leveling agent is 0.5-5%, benzoin is 0.2-1%, titanium dioxide and wollastonite are 3-25%, solid lubricant is molybdenum disulfide 3-20%, boron nitride 0-15% %, barium borate 0-10%, graphite 0-10%, molybdenum powder 0-10%, molybdenum oxide 0-10%, PTFE 0-10%. Ring-ring rolling/sliding contact dry friction and wear, under the conditions of sliding speed 0.793m/s and line load 10000N/m for 3 hours, the friction coefficient still remained at about 0.18, and the composite solid lubricating film remained intact.

Embodiment 3: Refer to figure (b) of Fig. 1 and Fig. 3 .

Carry out chemical film treatment on the ring surface of the steel ring whose material 1 is 40Cr to form a phosphating layer 2 with a thickness of 6-10 μm, and then rub one or several solid lubricants on the surface of the first transition layer to form a phosphating layer 2 with a thickness of 3-5 μm Thick second transition layer3. A 20-50 μm thick polyester/epoxy resin powder coating type solid lubricating film 4 is coated on the annular surface by electrostatic spraying and high-temperature curing. The curing conditions are: 180~220°C, 10~30min. In the coating, by mass percentage, the polyester resin P4127 is 30-85%, the curing agent epoxy resin E12 is 3-40%, and 3,5-di-tert-butyl-4-hydroxyphenyl propionate octadecyl alcohol is 3-5%, silicone leveling agent 0.5-5%, benzoin 0.2-1%, titanium dioxide and wollastonite 3-25%, solid lubricant molybdenum disulfide 3-20%, boron nitride 0-15%, barium borate 0-10%, graphite 0-10%, molybdenum powder 0-10%, molybdenum oxide 0-10%, PTFE 0-10%. Ring-ring rolling/sliding contact dry friction and wear, under the conditions of sliding speed 0.793m/s and line load 10000N/m for 3 hours, the friction coefficient still remained at about 0.20, and the composite solid lubricating film remained intact.

Embodiment 4: see Fig. 2.

The solid lubricating film gear is completely coated with a powder coating type composite solid lubricating film 6 on the tooth surface, pinion top and dedendum of the gear 5. The thickness of the solid lubricating film 6 is 20-25 μm measured by measuring the normal line of the gear. The surface roughness Ra is 0.8-0.9 μm.

Claims (6)

1. a powder coating type composite solid lubricant film comprises covering the lip-deep lubricant film of metal base (1), it is characterized in that described lubricant film is following three layers of solid film compound lubricant film:

(1) chemical films (2): i.e. first transition layer on described metal base (1) surface, has vesicular structure and solid lubrication characteristic; Described chemical films (2) is a phosphate layer;

(2) second transition layers (3): the solid lubricant coating on described chemical films (2);

(3) external surface coating (4): the polymeric powder type external surface coating on described second transition layer (3); Described polymeric powder type external surface coating (4) forms by spraying polymeric powder coating, described polymeric powder coating, and by weight percentage, its composition proportioning is:

Macromolecule resin 30～85%

Solidifying agent 3～40%

Solid lubricant 3～25%

3,5-di-t-butyl-4 hydroxy phenyl propionic acid octadecanol ester 3～5%

St-yrax 0.2～1%

Flow agent 0.5～5%

Titanium dioxide and wollastonite 3～25%.

2. powder coating type composite solid lubricant film according to claim 1 is characterized in that described solid lubricant is any or optional several mixing in molybdenumdisulphide, boron nitride, barium borate, graphite, molybdenum powder, molybdenum oxide and the tetrafluoroethylene.

3. powder coating type composite solid lubricant film according to claim 1 is characterized in that described macromolecule resin is a thermosetting polymer resin.

4. powder coating type composite solid lubricant film according to claim 3 is characterized in that described thermosetting polymer resin is Resins, epoxy, vibrin or polyester/epoxy composite type resin.

5. each method of system of the described powder-type composite solid lubricant film of claim 1, its step of preparation process is as follows:

(1) metal base (1) cleaning surfaces is handled: adopt degreasing and acid washing method to make cleaning surfaces;

(2) chemical conversion is handled and is generated chemical films (2): by etching solution and metallic surface chemical reaction takes place and generate phosphate layer;

(3) embrocate solid lubricant and form second transition layer (3): on above-mentioned chemical films (2) surface, embrocate described solid lubricant, service temperature is 50～150 ℃, the solid lubricant temperature is 50～150 ℃, and the mean diameter of solid lubricant particle is 1-4 μ m;

(4) the spraying high-molecular coating forms external surface coating (4): on second transition layer (3) surface, adopt the high pressure static electricity spray gun to carry out the described polymeric powder coating of electrostatic spraying, and the while hot setting, condition of cure is 180～220 ℃, 10～30min.

6 one kinds of gear wheel with solid lubricant film that adopt the described powder coating type composite solid lubricant film of claim 1, the complete coating lubricant film of tooth table, tooth top and the tooth root of gear, it is characterized in that described lubricant film is a powder coating type composite solid lubricant film, recording this solid lubrication film thickness by the prototype gear common normal is 20～25 μ m, and tooth-face roughness Ra is 0.8～0.9 μ m.