阅读说明：本技术 一种水基复合润滑剂及其制备与涂覆成膜工艺 (Water-based composite lubricant and preparation and coating film forming process thereof ) 是由 缪军 缪萍 张绪祥 缪长松 谭志凤 缪伟 于 2020-10-17 设计创作，主要内容包括：本发明提供了一种水基复合润滑剂及其制备与涂覆成膜工艺,其包括氮化硼(HBN)1％～2％、轻质氧化镁0.5％～1％、聚四氟乙烯(PTFE)浓缩分散液5％～15％、磷酸盐6％～12％、羧甲基纤维素钠0.5％～1％、亚甲基双萘磺酸钠1.5％～3％、去离子水65％～85％、水溶性防锈剂0.5％～1％。本发明通过水基溶液为载体佐以添加辅助添加剂,使得润滑剂克服了传统水基润滑剂吸附性能不足的问题,具有经济实用、润滑可靠、低耗无害的优点；工艺过程简单易行,作业快捷简便,可用于坯料冷锻加工前工序处理,实现表面润滑处理-冷锻成形加工作业自动化,降低管理成本,提高生产效率；表面薄膜涂层吸附可靠且具有优异的润滑性能,薄膜涂层本身对模具无锈蚀,可用水清洗、无损耗污染。(The invention provides a water-based composite lubricant and a preparation and coating film forming process thereof, which comprises 1-2% of boron nitride (HBN), 0.5-1% of light magnesium oxide, 5-15% of Polytetrafluoroethylene (PTFE) concentrated dispersion, 6-12% of phosphate, 0.5-1% of sodium carboxymethylcellulose, 1.5-3% of sodium methylene dinaphthalenesulfonate, 65-85% of deionized water and 0.5-1% of water-soluble antirust agent. The water-based lubricant disclosed by the invention has the advantages that the water-based solution is taken as a carrier and is added with the auxiliary additive, so that the problem of insufficient adsorption performance of the traditional water-based lubricant is solved, and the water-based lubricant has the advantages of economy, practicability, reliability in lubrication, low consumption and harmlessness; the process is simple and easy to implement, the operation is quick and simple, and the method can be used for the process treatment before the cold forging processing of the blank, realizes the automation of the surface lubrication treatment-cold forging forming processing operation, reduces the management cost and improves the production efficiency; the surface film coating has reliable adsorption and excellent lubricating property, and the film coating has no corrosion to the die, can be cleaned by water and has no loss and pollution.)

1. The water-based composite lubricant is characterized by comprising the following components in parts by weight:

2. the water-based composite lubricant as claimed in claim 1, wherein the boron nitride (HBN) fine powder has an average particle size of 1 to 5 μm.

3. The water-based composite lubricant as claimed in claim 1, wherein the Polytetrafluoroethylene (PTFE) concentrated dispersion has a relative solid content of 30-60%.

4. The water-based composite lubricant as claimed in claim 1, wherein the phosphate is a mixture of ammonium hydrogen phosphate and ammonium dihydrogen phosphate.

5. The preparation method of the water-based composite lubricant is characterized by comprising the following steps of:

1) the following ingredients were prepared by relative mass:

1-2% of boron nitride (HBN), 0.5-1% of light magnesium oxide, 5-15% of Polytetrafluoroethylene (PTFE) concentrated dispersion, 6-12% of phosphate, 0.5-1% of sodium carboxymethylcellulose, 1.5-3% of sodium methylenedinaphthalene sulfonate, 65-85% of deionized water and 0.5-1% of water-soluble antirust agent;

2) diluting the polytetrafluoroethylene concentrated dispersion liquid to a certain proportion by using deionized water, and then putting the polytetrafluoroethylene aqueous solution into a water bath to heat to a certain temperature;

3) adding a lubricating medium, a tackifier, a dispersant and an antirust agent in sequence, and fully stirring for more than 1min after adding one component;

4) after all the components are added, firstly stirring for more than 1h by an electric machine, then measuring the liquid viscosity by an NK-2 type viscometer, and adjusting the content of water to be in the viscosity standard range by adding the water in equal proportion;

5) to obtain the water-soluble composite milky dilute glue solution.

6. The method for preparing the water-based composite lubricant as claimed in claim 5, wherein the water bath heating temperature is 50 ℃ to 60 ℃.

7. The preparation method of the water-based composite lubricant as claimed in claim 5, wherein the viscosity increaser is sodium carboxymethyl cellulose, and the dispersant is sodium methylenedinaphthalene sulfonate (NNO).

8. A coating film forming process of a water-based composite lubricant is characterized by comprising the following steps:

1) carrying out decontamination, oil removal and rust removal pretreatment on the surface of a metal material sample by adopting a dip-coating method;

2) heating a metal material sample to 150-200 ℃ along with a furnace, and preserving heat for 1 hour or more;

3) quickly and completely immersing the metal material into the lubricating liquid, and keeping the immersion for several seconds;

4) the metal material is pulled out from the lubricating liquid at a constant speed;

5) and naturally airing or air-drying the metal material for several hours to form a film coating on the surface of the metal material.

Technical Field

The invention relates to a cold forging forming lubricant, in particular to a water-based composite lubricant and a preparation and coating film forming process thereof.

Background

In metal cold forging forming, the unit pressure of a blank to a die is usually as high as 2000-2500 MPa, which is far higher than the pressure of common pressure processing to the die. Under such high pressure, the contact surface between the metal and the mold is easily welded by "hot sticking", and the surface between the mold and the product is easily roughened. If a reasonable lubricating process is adopted, the direct contact of the two metal surfaces is prevented, the friction force between the blank and the surface of the die is reduced, and the generation of the cracks can be prevented or reduced. At present, a phosphorization-saponification treatment method is generally adopted before a large number of steel and aluminum cold forgings are formed, the lubricating effect is excellent, but the phosphorization-saponification process has the problems of complex procedures and more energy consumption, the operation condition is poor, the emission of waste liquid and waste gas can pollute the environment, and the industrial structure upgrading is difficult to be promoted by matching with industrial automatic production. Therefore, the search for the surface lubricating process which is simpler and more convenient than phosphating-saponification, has higher comprehensive benefit, saves energy and protects environment is an important breakthrough for promoting the development of the cold forging processing industry.

At present, graphite and molybdenum disulfide micro powder are mainly used as solid lubricating media, although the lubricating property is good and the pressure resistance is high, the graphite adhesion capability is low, and the molybdenum disulfide can generate harmful gas under the action of frictional heat. The requirements for the lubricant for cold forging forming are as follows: the friction coefficient is low, the adhesive capacity is strong, certain toughness (a lubricating layer with a certain film thickness is reserved in high-pressure and high-temperature friction) is maintained, the heat insulation performance is excellent, the cleaning is easy after the use, and the lubricant residue is free of pollution.

Compared with the traditional oil-based lubricant, the water-based lubricant has the advantages of excellent heat resistance, few or no pollutants, remarkable cooling performance and corrosion resistance, easiness in cleaning, abundant material sources and the like, and has wide application prospects in the industries of mechanical cutting processing, metal pressure forming and the like.

Disclosure of Invention

In view of the above, the invention provides a water-based composite lubricant, and provides a water-based composite lubricant for cold forging processing, which is low in preparation cost and stable in lubricating property.

Therefore, on one hand, the invention provides a water-based composite lubricant, which comprises the following components in parts by weight:

further, the boron nitride (HBN) fine powder has an average particle diameter of 1 to 5 um.

Further, the relative solid content of the Polytetrafluoroethylene (PTFE) concentrated dispersion liquid is 30-60%.

Further, the phosphate is a mixture of ammonium hydrogen phosphate and ammonium dihydrogen phosphate.

In another aspect, the present invention also provides a method for preparing a water-based composite lubricant, comprising the steps of:

A) the following ingredients were prepared by relative mass:

1-2% of boron nitride (HBN), 0.5-1% of light magnesium oxide, 5-15% of Polytetrafluoroethylene (PTFE) concentrated dispersion, 6-12% of phosphate, 0.5-1% of sodium carboxymethylcellulose, 1.5-3% of sodium methylenedinaphthalene sulfonate, 65-85% of deionized water and 0.5-1% of water-soluble antirust agent;

B) diluting the polytetrafluoroethylene concentrated dispersion liquid to a certain proportion by using deionized water, and then putting the polytetrafluoroethylene aqueous solution into a water bath to heat to a certain temperature;

C) adding a lubricating medium, a tackifier, a dispersant and an antirust agent in sequence, and fully stirring for more than 1min after adding one component;

D) after all the components are added, firstly stirring for more than 1h by an electric machine, then measuring the liquid viscosity by an NK-2 type viscometer, and adjusting the content of water to be in the viscosity standard range by adding the water in equal proportion;

E) to obtain the water-soluble composite milky dilute glue solution.

Further, the water bath heating temperature is 50-60 ℃.

Further, the tackifier is sodium carboxymethyl cellulose, and the dispersant is sodium methylenedinaphthalenesulfonate NNO.

In still another aspect, the present invention provides a coating film forming process for a water-based composite lubricant, comprising the following steps:

a) carrying out decontamination, oil removal and rust removal pretreatment on the surface of a metal material sample by adopting a dip-coating method;

b) heating a metal material sample to 150-200 ℃ along with a furnace, and preserving heat for 1 hour or more;

c) quickly and completely immersing the metal material into the lubricating liquid, and keeping the immersion for several seconds;

d) the metal material is pulled out from the lubricating liquid at a constant speed;

e) and naturally airing or air-drying the metal material for several hours to form a film coating on the surface of the metal material.

In the water-based composite lubricant and the preparation and coating film forming processes thereof, the water-based composite lubricant takes boron nitride (HBN) and Polytetrafluoroethylene (PTFE) aqueous solution as carriers and is added with a plurality of auxiliary additives simultaneously to improve the lubricating effect and the surface adhesion strength of the water-based lubricant; fully stirring the mixture in a water bath heating environment to obtain a water-soluble composite type milky dilute glue solution, and finishing the preparation of the water-based composite lubricant; the high-temperature metal workpiece with the clean surface is immersed into the lubricant, and a surface film coating is formed after the surface of the metal workpiece is dried, so that the coating and film forming operation is completed.

Therefore, compared with the prior art, the invention has the following beneficial effects:

1) the water-based solution is used as a carrier to be added with an auxiliary additive, so that the lubricant overcomes the problem of insufficient adsorption performance of the traditional water-based lubricant, and has the advantages of economy, practicability, reliable lubrication, low consumption and no harm;

2) the process is simple and easy to implement, the operation is quick and simple, and the method can be used for the process treatment before the cold forging processing of the blank, realizes the automation of the surface lubrication treatment-cold forging forming processing operation, reduces the management cost and improves the production efficiency;

3) the lubricating liquid and the coating film forming process can completely replace the traditional phosphating-saponification process for small deformation degree, save the economic cost and the energy consumption, avoid the environmental pollution and have obvious economic benefit and environmental benefit;

4) the surface film coating has reliable adsorption and excellent lubricating property, and in addition, the die is rustproof in an indoor storage environment under the coating of the surface coating, the film coating does not rust the die, and the film coating can be cleaned by water and has no loss and pollution.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a flow chart of a method for preparing a water-based composite lubricant according to an embodiment of the present invention;

fig. 2 is a flow chart of a coating film forming process of a water-based composite lubricant according to an embodiment of the invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The first embodiment is as follows:

this example provides a water-based composite lubricant in which the following components are first provided:

specifically, the average particle size of the boron nitride (HBN) micro powder is 1-5 um.

Specifically, the relative solid content of the Polytetrafluoroethylene (PTFE) concentrated dispersion liquid is 30-60%.

Specifically, the phosphate is a mixture of ammonium hydrogen phosphate and ammonium dihydrogen phosphate.

In the water-based composite lubricant provided by the embodiment, the water-based composite lubricant takes boron nitride (HBN) and Polytetrafluoroethylene (PTFE) aqueous solution as carriers, and is added with a plurality of auxiliary additives to improve the lubricating effect and the surface adhesion strength of the water-based lubricant; fully stirring the mixture in a water bath heating environment to obtain a water-soluble composite type milky dilute glue solution, and finishing the preparation of the water-based composite lubricant; the high-temperature metal workpiece with the clean surface is immersed into the lubricant, and a surface film coating is formed after the surface of the metal workpiece is dried, so that the coating and film forming operation is completed.

Therefore, the present embodiment has the following advantages compared to the prior art:

1) the water-based solution is used as a carrier to be added with an auxiliary additive, so that the lubricant overcomes the problem of insufficient adsorption performance of the traditional water-based lubricant, and has the advantages of economy, practicability, reliable lubrication, low consumption and no harm;

2) the process is simple and easy to implement, the operation is quick and simple, and the method can be used for the process treatment before the cold forging processing of the blank, realizes the automation of the surface lubrication treatment-cold forging forming processing operation, reduces the management cost and improves the production efficiency;

3) the lubricating liquid and the coating film forming process can completely replace the traditional phosphating-saponification process for small deformation degree, save the economic cost and the energy consumption, avoid the environmental pollution and have obvious economic benefit and environmental benefit;

4) the surface film coating has reliable adsorption and excellent lubricating property, and in addition, the die is rustproof in an indoor storage environment under the coating of the surface coating, the film coating does not rust the die, and the film coating can be cleaned by water and has no loss and pollution.

Example two:

referring to fig. 1, a method for preparing a water-based composite lubricant according to a second embodiment of the present invention is shown, which includes the following steps:

step S01 prepares the following components by relative mass calculation:

1-2% of boron nitride (HBN), 0.5-1% of light magnesium oxide, 5-15% of Polytetrafluoroethylene (PTFE) concentrated dispersion, 6-12% of phosphate, 0.5-1% of sodium carboxymethylcellulose, 1.5-3% of sodium methylenedinaphthalene sulfonate, 65-85% of deionized water and 0.5-1% of water-soluble antirust agent;

step S02, diluting the polytetrafluoroethylene concentrated dispersion liquid to a certain proportion by using deionized water, and then putting the polytetrafluoroethylene aqueous solution into a water bath to heat to 60 ℃;

step S03, adding the lubricating medium, the tackifier, the dispersant and the antirust agent in sequence, and fully stirring for more than 1min after adding one component each time;

step S04, after all the components are added, firstly stirring for more than 1h by an electric machine, then measuring the liquid viscosity by an NK-2 type viscometer, and adjusting the content of the added water to be within the viscosity standard range in equal proportion;

and step S05, obtaining the water-soluble composite milky dilute glue solution.

Specifically, the tackifier is sodium carboxymethyl cellulose, and the dispersant is sodium methylenedinaphthalenesulfonate NNO.

Example three:

referring to fig. 2, a coating film forming process of a water-based composite lubricant according to a third embodiment of the present invention is shown, which includes the following steps:

step S01, performing decontamination, oil removal and rust removal pretreatment on the surface of the metal material sample by adopting a dip-coating method;

step S02, heating the metal material sample to 150-200 ℃ along with the furnace, and preserving heat for 1h or more;

step S03, rapidly and completely immersing the metal material into the lubricating liquid, and keeping the immersion for a plurality of seconds;

step S04, the metal material is pulled out from the lubricating liquid at a constant speed;

and step S05, naturally airing or air-drying the metal material for several hours to form a thin film coating on the surface of the metal material.

The thickness of the coating is 80-100 um, and the layer thickness mainly depends on the viscosity of the lubricating liquid, the infiltration time, the pulling speed and other factors; the adhesive force of the coating is measured to be at least 50N by adopting an QFZ-II type paint film adhesive force tester, and the coating is peeled off from the matrix; the normal surface coating has iron gray appearance, smooth hand feeling and evenness, and is judged to be qualified if the coating does not fall off by being lightly scraped by a sheet.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.