KR20190033743A - A solid lubicant for waterborne air-curable coating - Google Patents

Abstract

A water-soluble room-temperature curing type solid lubricant comprising self-lubricating solid particles and a binder is provided. The binder is characterized in that at least one of an aqueous melamine resin and an emulsion resin is mixed with a polyol ester resin. According to the present invention, a coating material is further enhanced in water resistance, weather resistance and rustproofing properties.

Description

SOLID LUBICANT FOR WATERBORNE AIR-CURABLE COATING [0002]

TECHNICAL FIELD The present invention relates to a water-soluble room temperature curing type solid lubricant, and more particularly, to a water-soluble room temperature curing type solid lubricant having improved water resistance, load resistance, friction characteristics and environmental friendliness.

A solid lubricant with a coating film is basically used when it is necessary to adopt a semi-permanent lubrication method because it is impossible to supply lubricants such as cryogenic temperature, high temperature and high vacuum, which are unsuitable for oil or grease, As a kind of special lubricant, it is a form in which solid particles having self-lubricating properties are dispersed in a solution composed of an organic or inorganic type binder and a solvent, and the solvent part is evaporated upon application to the surface of the material, And remains in the form of a solid coating, thereby reducing the friction coefficient of the material surface and increasing the wear resistance.

The material used as the binder may range from starch syrup conventionally used to thermoplastics such as acrylic and cellulose, thermosetting resins such as phenol and epoxy, and inorganic materials such as phosphate and silicate. In general, when durability and chemical resistance are particularly required, a thermosetting binder in the form of phenol, epoxy, or a mixture thereof is used. A thermosetting binder that is hard to heat-harden When processing is required, room temperature curing type is used.

On the other hand, in the case of an organic polymer resin binder in general, a binder having a room temperature curing type structure made of a thermoplastic resin has properties of low hardness, toughness and heat resistance because the crosslinking density is relatively low compared with a binder made of a thermosetting resin. Therefore, when a thermoplastic resin which is convenient to use for a room temperature curing type adhesive bonding lubricant is used as a binder, the physical properties of the binder greatly affect the performance of the lubricant. Therefore, the characteristics of the binder should be preferentially improved in order to increase the durability life of the lubricant coating .

With regard to a film-sticking solid lubricant of a room temperature curing type, the present inventors have proposed a thermoplastic resin composition comprising a thermoplastic resin in a single or mixed form selected from the group consisting of an alkyd resin, an acrylic resin, and a cellulosic resin through the Korean Patent No. 10-0244007 Discloses a method for producing a film-form solid lubricant composition which is capable of curing at room temperature using various kinds of self-lubricating materials at 50 wt%, and is excellent in lubrication performance and durability of a lubricating film.

In recent years, in order to preserve the global atmospheric environment, it is required that solvents of volatile organic compounds (VOC) components used for paints and coating materials in automobiles and other various industries are not used as much as possible. There is a great need for the use of environmentally friendly water-soluble paints and coatings in the form of emulsions which dissolve or disperse in water. The water-soluble coating agent can be prepared by using a hydrophilic resin completely dissolved in water, or by emulsion-type resin dispersed in water by an emulsifier, a water-dispersible resin dispersed in water by a polar resin outside the particle, Other water-based resins are used.

However, in the case of a coating agent using such a water-soluble resin, it is easy to use and has good environment-friendliness, while the constituent materials such as resins are not only heterogeneous but also have characteristics of water with high polarity, There is a relatively high incidence of failure. In addition, compared to conventional coating lubricants, there is a high need to effectively supplement and improve these problems in order to protect the friction contact surfaces that undergo sliding motion under high load, because they are relatively inferior in water resistance, weather resistance, heat resistance, abrasion resistance and load resistance.

Particularly, when a water-soluble emulsion resin is used as a coating agent for lubrication purposes, since the polarity of the water solvent is high, it is necessary to maintain dispersion stability so as not to cause physicochemical reaction with various kinds of functional lubricating fillers added to the coating agent Is a very important technical requirement.

An object of the present invention is to provide a water-soluble room temperature curing type solid lubricant having improved water resistance, heat resistance, and sliding friction wear characteristics.

Other objects and advantages of the present invention will become apparent from the following description. It is also to be easily understood that the objects and advantages of the present invention can be realized by the means or method described in the claims, and the combination thereof.

According to one aspect of the present invention, there is provided a water-soluble room temperature curing type solid lubricant comprising self-lubricating solid particles and a binder, wherein the binder is a mixture of at least one of an aqueous melamine resin and an emulsion resin with a polyol ester resin Soluble solid-state curing type solid lubricant.

The molecular weight of the polyol ester resin may be 10,000 to 20,000.

The emulsion resin may be an acrylic emulsion resin.

The emulsion resin may be 5 to 50 parts by weight based on 100 parts by weight of the polyol ester resin.

The melamine resin may be 2 to 20 parts by weight based on 100 parts by weight of the binder.

The binder may be 25 to 250 parts by weight based on 100 parts by weight of the magnetic lubricant.

According to another aspect of the present invention, the above-mentioned solid lubricant may further include a rust-preventive additive.

The rust-preventive additive may include at least one of an inorganic compound and an organic compound.

The inorganic compound may be at least one selected from the group consisting of a lead phosphate compound, tin chloride, strontium chromate, lead chromate, zinc chromate, zinc oxide and zinc phosphate.

The organic compound may be at least one of metal salts of trihydroxybenzene, butylhydroxytoluene, and dinonylnaphthalene monosulfonic acid.

The rust-inhibitive additive may be 1 to 5 parts by weight based on 100 parts by weight of the solid lubricant.

According to another aspect of the present invention, the solid lubricant may further include at least one of an antioxidant, a dispersion stabilizer, a coupling agent, and an antifungal agent.

The additive may be 0.1 to 5 parts by weight based on 1000 parts by weight of the total solid lubricant.

The polyol ester may contain a functional group of at least one of a carboxyl group, a sulfonic acid group, an ester group, an amino group, a hydroxyl group and an ether group in the molecular structure.

The self-lubricating solid particles may be selected from the group consisting of tin disulfide (WS ₂ ), graphite, antimony oxide (Sb ₂ O ₃ ), tetrafluoroethylene (PTFE), graphite fluoride, carbon nanotube, At least one selected from the group consisting of boron nitride (PbO), boron nitride (BN), and calcium fluoride (CaF ₂ ) and molybdenum disulfide (MoS ₂ ).

The polyol ester resin is prepared by a dehydration condensation reaction between an unsaturated fatty acid and a polyhydric alcohol. The unsaturated fatty acid is selected from the group consisting of oleic acid, adipic acid, caprylic acid and caproic acid ), ≪ / RTI >

The polyhydric alcohol may be at least one of trimethylolpropane, pentaerythritol, and neopentylglycol.

The present invention uses a binder containing a mixture of a polyol ester resin and an aqueous melamine resin to improve the heat resistance of the water-soluble solid lubricant and improve the load-bearing property. When the solid lubricant coating lubricant is in sliding contact under a high load, There is an advantage of remarkably improving.

Further, it is advantageous to further improve the water resistance, weather resistance, and rustproofing property of the coating material by additionally mixing a small size acrylic emulsion resin capable of dispersing in water in the polyol ester resin or the mixed resin of the polyol ester resin and the aqueous melamine resin .

Hereinafter, the present invention will be described in detail. Prior to that, terms and words used in the present specification and claims should not be construed in a conventional or dictionary sense, and the inventor can appropriately define the concept of a term in order to describe its invention in the best possible way It should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the configuration shown in the embodiments described in the present specification is only the most preferred embodiment of the present invention, and does not represent all the technical ideas of the present invention. Therefore, at the time of the present application, It is to be understood that equivalents and modifications are possible.

The binder of the water-soluble room temperature curable solid lubricant containing the self-lubricating solid particles and the binder according to an embodiment of the present invention is a mixture of at least one of water-soluble melamine resin and acrylic emulsion resin and polyol ester resin.

At this time, it has been found that by using the binder containing the polyol ester resin and the water-soluble melamine resin and / or acrylic emulsion resin, the water resistance of the solid lubricant is improved and the heat resistance and the frictional wear lubrication performance of the solid lubricant coating are significantly improved .

The self-lubricating solid particles are formed such that the solid particles having self-lubricating properties are uniformly dispersed in a solution comprising an organic binder and water and an alcohol solvent. When the lubricant is applied to the surface of the material, the solvent portion evaporates, Only the binder component remains to form a solid film, thereby reducing the friction of the material surface and providing a lubricating function for increasing wear resistance.

The self-lubricating solid particles which can be applied to the present invention are selected from the group consisting of molybdenum disulfide (MoS ₂ ) and optionally tungsten disulfide (WS ₂ ), graphite, antimony oxide (Sb ₂ O ₃ ), tetrafluoroethylene (PTFE) And may include at least one selected from the group consisting of graphite fluoride, carbon nanotube, lead oxide (PbO), boron nitride (BN), calcium fluoride (CaF ₂ ), and the like. These may be used alone, but in order to obtain a synergistic effect, molybdenum disulfide and any one or more of the above compounds may be used as a mixture blended at a specific ratio so as to have desired physical properties.

In addition, it is effective to use an average size of the self-lubricating solid particles as small as possible within 10 μm, preferably 3 to 6 μm.

The self-lubricating solid particle component in the solid lubricant of the present invention may be present in an amount of 30 to 70 parts by weight based on 100 parts by weight of the total solid content. When the content of the self-lubricating solid particles is less than 30 parts by weight, the lubricity of the coating layer is remarkably reduced and the frictional force is increased, and the damage of the coating rapidly proceeds. On the contrary, when the amount of the binder exceeds 70 parts by weight, the content of the binder is relatively decreased, and the bonding force to the metal surface is weakened, so that the lubricating film is easily worn and it is difficult to form a firm and dense coating.

The binder that can be used in the present invention is a mixture of at least one of an aqueous melamine resin and an acrylic emulsion resin and a polyol ester resin. When used as described above, the binder improves the heat resistance and water resistance of the surface of the solid lubricant coating film not. There is an advantage that wear resistance and load-bearing property are excellent at the time of friction contact, thereby preventing the mechanical wear and the deterioration of the frictional wear characteristics, and the durability, sliding property and adhesiveness are improved.

The polyol ester resin may be a compound containing one or more functional groups such as a carboxyl group, a sulfonic acid group, an ester group, an amino group, a hydroxyl group and an ether group in the molecule. Preferably, the polyol ester resin is an aliphatic polyol ester, Ester, etc. These compounds may be used alone or in combination.

The polyol ester resin is prepared by a dehydration condensation reaction between an unsaturated fatty acid and a polyhydric alcohol. The unsaturated fatty acid is selected from the group consisting of oleic acid, adipic acid, caprylic acid and caproic acid Caproic acid, and the polyhydric alcohol may be at least one of trimethylolpropane, pentaerythritol, and neopentylglycol.

On the other hand, it is preferable to use a polyol ester having a molecular weight in the range of 10,000 to 20,000, more preferably in the range of 10,000 to 15,000, for the purpose of favorable mechanical properties of a binder that performs sliding friction contact over a long period of time. If the molecular weight is less than 10,000, the brittleness of the resin increases. If the molecular weight exceeds 20,000, the mechanical properties are deteriorated.

The water-soluble resin soluble in water may have problems such as deterioration of water resistance after curing and deterioration of physical properties due to atmospheric humidity, since the compound has many hydrophilic parts. In the present invention, the emulsion resin is mixed with a dispersion emulsion in which resin particles of about 0.1 to 1.0 탆 are dispersed in water by emulsifying agent and emulsion polymerization is carried out by emulsion polymerization in order to improve the water resistance of the binder. Acrylic emulsions, vinyl acetate emulsions, urethane emulsions and fatty acid-modified acryl-modified epoxy esters can be used, and acrylic emulsions can be preferably used.

At this time, the emulsion resin may be mixed with 100 parts by weight of the polyol ester resin used together so as to include 5 to 50 parts by weight, preferably 10 to 30 parts by weight of the compound. When the amount of the emulsion compound is less than 5 parts by weight, it is difficult to exhibit the above-mentioned characteristics, and when it exceeds 50 parts by weight, thermal and mechanical properties of the coating layer are deteriorated. In order to improve the heat resistance and mechanical properties of the binder according to an embodiment of the present invention, the melamine resin may include 2 to 20 parts by weight based on 100 parts by weight of the binder. When the content of the melamine resin is less than 5 parts by weight, it is difficult to exhibit the properties expected above. When the content of the melamine resin is more than 20 parts by weight, the curing time of the coating layer becomes long under normal temperature conditions or the curing is insufficient May occur.

In addition, the total weight of the binder according to one embodiment of the present invention may include 25 to 250 parts by weight based on 100 parts by weight of the self-lubricating solid particles to be applied together. When the binder is less than 25 parts by weight, If the amount is more than 250 parts by weight, the friction characteristic of the binder is predominantly applied to increase the frictional force, resulting in an increase in frictional heat, resulting in a breakage of the coating.

According to another embodiment of the present invention, the solid lubricant may further comprise a rust-preventive additive, which material is capable of imparting excellent rust-inhibiting properties to the solid lubricant while not interfering with the lubrication characteristics of the solid lubricant in the art It can be applied without restrictions. Non-limiting examples include organic-based rust-inhibiting additive compounds or inorganic-based rust-inhibitive additives alone, or may be used as mixtures in which any two or more of the above-mentioned compounds are combined in a particular ratio to achieve synergistic rust- have.

The organic rust-preventive additive may be used without limitation in the art, and examples thereof include metal salts of trihydroxybenzene, butylhydroxytoluene and dinonylnaphthalene monosulfonic acid, which may be used singly or in combination . In addition, the inorganic-based rust-preventive additive can be used without limitation in the art, and examples thereof include, but are not limited to, lead phosphate compounds, tin chloride, strontium chromate, lead chromate, zinc chromate, zinc oxide, zinc phosphate, May be used alone or in combination.

In addition, the rust-preventive additive may be present in an amount of 1 to 5 parts by weight based on 100 parts by weight of the total solid lubricant. The amount of the rust-preventive additive is inversely related to the lubrication property. It is difficult to anticipate effective rust inhibition. If the amount of the antioxidant is more than 5 parts by weight, the lubricity of the coating is rapidly lowered and the life of the lubricant coating is shortened.

In addition, the solid lubricant according to an embodiment of the present invention may further include additives used in the art such as antioxidants, dispersion stabilizers, coupling agents, antifungal agents, etc. in addition to the above-mentioned components. Non-limiting examples of the antioxidant include propyl gellate and titanium which increases the cross-linking density of the resin. As a non-limiting example of the coupling agent, a silane compound and the like can be used. In this case, the additives may be present in a ratio of 0.1 to 5 parts by weight based on 100 parts by weight of the total solid lubricant. If the additive is used in an amount exceeding 5 parts by weight, the lubricant performance of the coating layer tends to be lowered. Which is undesirable.

In addition, the purity of the compounds contained in the solid lubricant of the present invention is preferably 98% or more.

Hereinafter, a method of producing the solid lubricant of the present invention will be described. However, the techniques applied in the technical field are not limited and can be applied only to one embodiment.

The water-soluble room temperature curing type solid lubricant according to the present invention basically consists of self-lubricating solid particles, a binder and other additives, and is put into a mixed solvent containing a solvent such as water, butanol, cellosolve, an auxiliary solvent and a diluting solvent The mixture may be uniformly dispersed using a milling apparatus, and then the remaining mixed solvent may be added and stirred to finally complete the reaction.

At this time, the volumetric ratio between the solid content and the solvent is about 40:60, thereby preparing the undiluted solution. Since the thickness of the coating film depends on the solid content of the solution, when the coating is actually applied onto the metal surface, the stock solution may be diluted again according to the desired thickness.

The thickness of the coating-coating lubricant is effective when it is about 5 to 30 탆, and about 15 탆 is most suitable. If the film thickness is larger than this range, the lubricity is lowered, and when it is too thin, both the lubricity and the rust prevention property are lowered.

The application of the coating-coating lubricant solution can be carried out by a dipping method, a spraying method, a method using a brush or a roller, or the spraying method is most suitable when obtaining a uniform thickness of coating layer or considering mass production.

The drying and curing time is about 24 hours at room temperature to volatilize the solvent or, preferably, after curing under natural drying conditions, curing in a forced convection oven at 50 to 80 ° C for about 10 minutes.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to examples. However, the embodiments according to the present invention can be modified in various other forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art.

[Production Example 1]

40.0 parts by weight of a polyol ester resin binder as a thermoplastic water-soluble resin, 37.0 parts by weight of molybdenum disulfide, 8.0 parts by weight of graphite, 4.5 parts by weight of antimony oxide, 10.0 parts by weight of PTFE, 0.15 parts by weight of propyl gellate 0.10 part by weight of a nonionic surfactant, 0.15 part by weight of a nonionic surfactant, 0.05 parts by weight of a dispersion stabilizer and 0.05 part by weight of a defoaming agent were dissolved in about 30 grams of distilled water, The above-mentioned self-lubricating solid particles are added and dispersed evenly using a milling apparatus. The self-lubricating solid particles whose surfaces were non-ionically passivated were secondarily charged into the above-mentioned water-soluble acrylic emulsion resin, and the dispersion stabilizer was added thereto. The dispersion was then uniformly dispersed again using a milling apparatus, Benzotriazole, defoamer, etc. were added and stirred to prepare a lubricant solution.

[Production Example 2]

 30 parts by weight of the acrylic emulsion resin was mixed with 100 parts by weight of the total binder in the polyol ester resin to prepare a solid lubricant binder so that the total amount of the binder was 40 parts by weight per 100 parts by weight of the total lubricating composition, And the manufacturing process were the same as those in Production Example 1 to prepare a lubricant solution.

[Production Example 3]

A polyol ester resin was further mixed with 30 parts by weight of an acrylic emulsion resin and 5 parts by weight of an aqueous melamine resin with respect to 100 parts by weight of the total binder to prepare a solid lubricant binder having a total content of the binder of 40 wt% And the other components and the manufacturing process were the same as in Production Example 2 to prepare a lubricant solution.

[Production Example 4]

30 parts by weight of the acrylic emulsion resin and 5 parts by weight of the water-soluble melamine resin were added to the polyol ester resin in an amount of 100 parts by weight based on 100 parts by weight of the total binder to form a solid lubricant binder, 30 parts by weight of a binder resin, 47.0 parts by weight of molybdenum disulfide, 8.0 parts by weight of graphite, 4.5 parts by weight of antimony oxide, 10.0 parts by weight of PTFE, 0.25 part by weight of propyl gellate, 0.15 part by weight of banotriazole, 0.05 parts by weight of a dispersion stabilizer, ≪ / RTI > by weight.

[Comparative Example 1]

Compared with the above Production Example 1, 40 parts by weight of the polyol ester resin binder was replaced by 40 parts by weight of the acrylic emulsion resin binder with respect to 100 parts by weight of the total lubricating composition, and the lubricant solution was prepared in the same manner as the remaining components.

[Comparative Example 2]

In comparison with Comparative Example 1, except that the self-lubricating solid particles were modified to be nonionic by using a nonionic surfactant, they were directly dispersed in a water-soluble acrylic emulsion resin binder using a milling apparatus, Benzotriazole, defoamer, etc., and a lubricant solution was prepared after stirring.

[Comparative Example 3]

In Production Example 2, the acrylic emulsion resin content was replaced with the same amount of urethane resin as the melamine resin to form a binder for the solid lubricant, and the lubricant solution was prepared in the same manner as the remaining components and the manufacturing process.

 [Comparative Example 4]

Compared with the above-mentioned Production Example 3, the binder of the solid lubricant was prepared by mixing 10 parts by weight of the aqueous melamine resin relative to 100 parts by weight of the total binder, thereby obtaining a total of the binder The content was changed to 40 parts by weight, and the lubricant solution was prepared in the same manner as in Production Example 3 except for the remaining components and the production process.

Performance evaluation test method

The evaluation of the performance of the film-adhering lubricant of the present invention was carried out according to the Falex test method (ASTM D-2625) and the LFW-1 test method (ASTM D-2714) . In the Palex test, the load-bearing capacity of the solid lubricant film under dry friction conditions was measured, and the lifetime and dynamic friction characteristics of the solid lubricant film were evaluated in the LFW-1 test. The test load in the LFW-1 test was set at 630 pounds in accordance with the relevant test specification. The durability life of the adhesive lapping lubricant was measured by the initial treading procedure and a total of up to a point at which the value of the slip friction coefficient, The test rotational speed was set as a reference. In addition, all the test results were repeated at least 3 times to obtain the average value. The sliding friction coefficient in the LFW-1 test was taken as the result of the dynamic friction coefficient test after the friction characteristic was stabilized through the initial treading process.

The test specimens to be coated with the adhesive-bonding lubricant were sand-blasted with alumina particles having a size of # 120 mesh to increase the bonding force with the lubricant after the surface contaminants were completely removed . At this time, the surface roughness of the test specimen was about 0.8 to 1.2 탆, and after the particles present on the surface were removed, washing treatment was performed again, and other chemical conversion coating treatment was not performed

Test Type Palex test
(ASTM D-2625) LFW-1 test
(ASTM D-2714) Load-bearing capacity (pounds) Durability Life (total cycle) Coefficient of friction Production Example 1 1,750 8,900 0.08 Comparative Example 1 500 500 0.08 Comparative Example 2 - - - Production Example 2 1,750 20,600 0.07 Comparative Example 3 1,500 20,200 0.07 Production Example 3 2,000 21,000 0.07 Comparative Example 4 2,250 21,500 0.07 Production Example 4 2,000 38,500 0.06

In the Palex test of the solid lubricant specimen prepared in Preparation Example 1, the load-bearing capacity was measured at 1,750 pounds. In the LFW-1 test, the durability life was 8,900 cycles and the coefficient of dynamic friction was about 0.08.

On the other hand, in the solid lubricant specimen prepared in Comparative Example 1 in which the polyol ester resin binder of Production Example 1 was replaced by the same amount of acrylic emulsion resin, the load resistance was 500 pounds in the Palex test, and in the LFW-1 test Was about 500 minutes, and it was confirmed that the abrasion resistance is relatively inferior to the test result in Production Example 1 described above.

On the other hand, in the case of Comparative Example 2 in which the lubricant was produced except for the process of modifying the self-lubricating solid particles to nonionic by using the nonionic surfactant, the coagulation of the coating agent occurred in the course of manufacturing the coating liquid. Therefore, when a water-soluble emulsion resin is used as a binder as in the present invention, the surface is passivated so as not to cause a physicochemical reaction with functional lubricating fillers having various kinds of minute sizes of surface ionic properties added to the coating agent, It was confirmed that it is a very important technology to prevent degradation of storage stability due to surface reaction with a binder component that determines physico-chemical properties and to maintain dispersion stability well.

On the other hand, in the Palex test of the solid lubricant prepared by mixing 30 parts by weight of the acrylic emulsion resin with 100 parts by weight of the total binder in the polyol ester resin, a solid lubricant binder was measured in a similar manner to 1,750 pounds, while LFW- 1 test showed a durability life of 20,600 cycles and a coefficient of dynamic friction of about 0.07, indicating that the friction and wear characteristics of the solid lubricant binder mixed with the polyol ester resin and the acrylic emulsion resin were relatively increased. As described above, the solid lubricant prepared from the binder mixed with the polyol ester resin and the acrylic emulsion resin is affected by the acrylic emulsion resin having a relatively high water resistance, and the synergistic effect of increasing the water resistance as well as the friction wear characteristics of the solid lubricant is relatively large .

On the other hand, in the Paralex test in Production Example 3 in which the acrylic emulsion resin in Production Example 2 was replaced with the same amount of water-soluble urethane resin to prepare a binder for solid lubricant, the load-bearing property was measured at about 1,500 pounds. , The durability life was about 21,000 cycles and the coefficient of dynamic friction was about 0.07, and the friction and abrasion characteristics of the solid lubricant were similar to those in Production Example 2.

On the other hand, 30 parts by weight of the acrylic emulsion resin and 5 parts by weight of the aqueous melamine resin were further mixed with 100 parts by weight of the total binder in the polyol ester resin so that the total content of the binder was 40 parts by weight per 100 parts by weight of the total lubricating composition. In Example 3, the load-bearing capacity of the Palex test was measured to be about 2,000 pounds. The LFW-1 test showed a life span of 21,000 cycles and a coefficient of dynamic friction of about 0.08. Therefore, when the aqueous melamine resin is further added to the binder, the load resistance of the solid lubricant is relatively increased due to the influence of the melamine resin having excellent heat resistance.

The result that the load resistance of Comparative Example 4 in which the content of the aqueous melamine resin in the solid lubricant binder component was relatively increased and the melamine resin was mixed in the amount of about 10 parts by weight based on 100 parts by weight of the total binder was increased to about 2,250 pounds, It was confirmed that the addition of the melamine resin influences the increase in the load-bearing capacity of the solid lubricant. However, if the content of the melamine resin in the binder is increased to 10 parts by weight or more based on 100 parts by weight of the total binder, the curing of the solid lubricant is likely to be retarded or proceed poorly.

On the other hand, as compared with that in Production Example 3, the load resistance of the solid lubricant in Production Example 4 in which the total weight of the binder was reduced to 30 with respect to 100 parts by weight of the total lubricating composition as the same binder composition was measured at about 2000 pounds, 1 test showed a durability life of 38,500 cycles and a coefficient of dynamic friction of about 0.06. The above results indicate that the friction and wear characteristics of the solid lubricant are excellent when the total content ratio of the self-lubricating particles contained in the solid lubricant component is about 70 parts by weight based on 100 parts by weight of the total lubricating composition Could know. However, if the total content of self-lubricating particles contained in the solid lubricant component is greater than or equal to 70 parts by weight based on 100 parts by weight of the total lubricant composition and the content of the binder is reduced to less than 30 parts by weight, There is a high possibility that the surface is rough or poorly formed.

Although the present invention has been described with reference to the exemplary embodiments, it is to be understood that the present invention is not limited thereto and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

Claims (16)

A water-soluble room temperature curing type solid lubricant comprising self-lubricating solid particles and a binder,
Wherein the binder is a mixture of at least one of an aqueous melamine resin and an emulsion resin and a polyol ester resin. The method according to claim 1,
Wherein the polyol ester resin has a molecular weight of 10,000 to 20,000. The method according to claim 1,
Wherein the emulsion resin is an acrylic emulsion resin. The method according to claim 1,
Wherein the emulsion resin is 5 to 50 parts by weight based on 100 parts by weight of the polyol ester resin. The method according to claim 1,
Wherein the melamine resin is 2 to 20 parts by weight based on 100 parts by weight of the binder. The method according to claim 1,
Wherein the binder is 25 to 250 parts by weight based on 100 parts by weight of the magnetic lubricant. The method according to claim 1,
A waterborne, room temperature curable solid lubricant further comprising a rust inhibitive additive. 8. The method of claim 7,
Wherein the rust-preventive additive comprises at least one of an inorganic compound and an organic compound. 9. The method of claim 8,
Wherein the inorganic compound includes at least one selected from the group consisting of a lead phosphate compound, tin chloride, strontium chromate, lead chromate, zinc chromate, zinc oxide and zinc phosphate. 9. The method of claim 8,
Wherein the organic compound comprises at least one of trihydroxybenzene, butylhydroxytoluene, and dinonylnaphthalene monosulfonic acid metal salt. 8. The method of claim 7,
Wherein the rust-preventive additive is 1 to 5 parts by weight based on 100 parts by weight of the solid lubricant. 8. The method of claim 1 or 7,
Wherein the solid lubricant further comprises at least one additive selected from the group consisting of an antioxidant, a dispersion stabilizer, a coupling agent, and a mold inhibitor. 13. The method of claim 12,
Wherein the additive is 0.1 to 5 parts by weight based on 1000 parts by weight of the total solid lubricant. The method according to claim 1,
Wherein the polyol ester comprises at least one functional group selected from a carboxyl group, a sulfonic acid group, an ester group, an amino group, a hydroxyl group and an ether group in a molecular structure. The method according to claim 1,
The self-lubricating solid particles may be selected from the group consisting of tin disulfide (WS ₂ ), graphite, antimony oxide (Sb ₂ O ₃ ), tetrafluoroethylene (PTFE), graphite fluoride, carbon nanotube, Wherein at least one selected from the group consisting of boron nitride (PbO), boron nitride (BN) and calcium fluoride (CaF ₂ ) and molybdenum disulfide (MoS ₂ ) are contained. The method according to claim 1,
The polyol ester resin is prepared by a dehydration condensation reaction between an unsaturated fatty acid and a polyhydric alcohol,
Wherein the unsaturated fatty acid is at least one of oleic acid, adipic acid, caprylic acid and caproic acid,
Wherein the polyhydric alcohol is at least one selected from the group consisting of trimethylolpropane, pentaerythritol, and neopentylglycol.