CN109652194B - A kind of water-based lubricating composition for titanium alloy friction pair - Google Patents

Abstract

The invention discloses a water-based lubricating composition for a titanium alloy friction pair, which is characterized by comprising hydroxyethyl cellulose, a silane compound, an acid compound, an alcohol compound, a titanate coupling agent and water. The water-based lubricant composition disclosed by the invention can weaken the volatilization of water molecules, can reduce the friction and wear of the titanium alloy friction pair, prolongs the service life of the titanium alloy friction pair, and has the characteristics of small friction coefficient and no pollution of wastes.

Description

A kind of water-based lubricating composition for titanium alloy friction pair

technical field

The invention relates to the technical field of lubrication, in particular to a water-based lubricating composition for titanium alloy friction pairs.

Background technique

Compared with most metal materials, titanium alloy materials have the advantages of high specific strength, high tensile strength, low elastic modulus, high heat resistance, good corrosion resistance, and no ferromagnetism. Based on the above advantages, titanium alloy materials are currently used in aerospace, marine engineering, petrochemical, biomedical, ships, equipment, automobiles and daily necessities. In the above fields, the phenomenon of friction and wear of titanium alloy parts can be seen everywhere, but due to the low hardness of titanium alloy, its anti-wear and anti-friction performance is poor, which is an unfavorable factor limiting its application. When titanium alloy materials are used as friction pair components (such as shafts and bearings), their friction and wear characteristics will directly affect the reliability and durability of mechanical equipment. Poor anti-wear performance will shorten the service life of equipment and increase industrial production. cost. Therefore, how to improve the wear resistance of titanium alloy friction pairs, thereby prolonging the service life and reducing production costs, has important economic value for saving production materials and improving production efficiency.

The application of efficient anti-friction lubrication technology in the mechanical field can reduce the friction and wear of mechanical equipment, improve the reliability and durability of mechanical equipment, reduce the consumption of petroleum resources, and reduce environmental pollution. In industrial production, fluid lubricants and solid lubricants are widely used, but with the rapid development of vehicles (such as high-speed trains, spacecraft) and high-precision equipment (such as optical and electrical instruments), industrial applications require more and more lubrication technology. In recent years, traditional fluid lubrication and solid lubrication technologies cannot meet the needs of equipment for ultra-low friction and zero wear. In recent years, with the improvement of micro- and nano-scale processing and manufacturing technology, the application of high-tech devices such as micro-electromechanical systems (MEMS) will become increasingly widespread, such as micro-motors, micro-pumps, MEMS accelerometers, micro-robots and micro-medical devices. Traditional lubricants cannot Used in micro-electromechanical systems. Water-based lubrication has the advantages of low high-pressure viscosity, low high-pressure friction resistance, good heat dissipation performance, non-flammability, and no environmental pollution by waste. It has attracted the attention of scientific researchers after it was proposed. Water-based lubrication not only has huge industrial application potential in micro-electromechanical systems and high-precision equipment, but its green environmental protection features meet the requirements of sustainable development. The development of water-based lubrication has great social and economic value.

At present, the water-based lubricating properties of titanium alloys have been deeply studied. After running-in, the titanium alloy can obtain a lower friction coefficient and a lower wear amount, but the water molecules in the water-based lubrication will volatilize, which will weaken the friction-reducing lubrication performance of the water-based lubrication, thereby causing the friction and wear of the titanium alloy to increase. Therefore, using a better method to improve the existing water-based lubrication technology can reduce the friction and wear of titanium alloy friction pairs and prolong the service life of titanium alloy friction pairs, which is of great significance to titanium alloy friction pairs on industrial equipment. .

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention discloses a water-based lubricating composition for titanium alloy friction pairs, the water-based lubricating composition can improve water-based lubricating performance, reduce friction and wear of titanium alloy friction pairs, and prolong titanium alloy friction. The service life of the friction pair. The technical means adopted in the present invention are as follows:

A water-based lubricating composition for a titanium alloy friction pair, the water-based lubricating composition comprises hydroxyethyl cellulose, a silane compound, an acid compound, an alcohol compound, a titanate coupling agent and water .

The water-based lubricant composition includes the following parts by weight:

Hydroxyethyl cellulose: 0.01-8 parts;

Silane compound: 0.01-12 parts;

Acid compounds: 0.01-5 parts;

Alcohol compounds: 0.01-10 parts;

Titanate coupling agent: 0.01-2 parts;

Water: 63-92 parts.

The water-based lubricant composition includes the following parts by weight:

Hydroxyethyl cellulose: 0.01-4 parts;

Silane compound: 0.01-6 parts;

Acid compounds: 0.01-4 parts;

Alcohol compounds: 0.01-4 parts;

Titanate coupling agent: 0.01-1 part;

Water: 81-96 parts.

The dynamic viscosity of the hydroxyethyl cellulose is 80-125 mPa·s, the conditions are 25° C., 2.00 wt.%, and the hydroxyethyl cellulose is combined with water molecules to generate hydration molecules, which exert a hydration repulsion effect to form a network of the water-based lubricating composition. like structure.

The silane compound is one or more mixtures of hexamethylcyclotrisiloxane, 3-aminopropyltriethoxysilane and aminopropyltrimethoxysilane, and the silane compound is miscible with water and hydrolyzed React and form hydroxyl groups or combine with other hydroxyl groups to enhance the binding force and scope of hydration molecules.

The acid compound is one or several mixtures of boric acid, phosphoric acid, hydrochloric acid and sulfuric acid. The acid compound can be ionized to generate hydrogen ions, control the hydrolysis reaction of low molecular weight silane compounds, and at the same time have chemical properties on the surface of the titanium alloy friction pair. processing effect.

The alcohol compound is one or several mixtures of 1-propanol, 1,2-propanediol, glycerol, 1,4-butanediol and 1,5-pentanediol, and the above-mentioned alcohol compound has excellent properties. The high water absorption and water retention can reduce the volatilization of water molecules in the water-based lubricant composition.

The titanate coupling agent is one or several mixtures of isopropyl titanate, chelated 100-type titanate and chelated 200-type titanate. Hydrated molecules are combined with the surface of the titanium alloy friction pair to form a reliable hydrated molecule layer on the surface of the titanium alloy to avoid solid contact on the surface of the titanium alloy friction pair.

The water is deionized water. The water is not particularly limited, preferably deionized water, as the matrix of the water-based lubricant composition, forms hydrated molecules with other compounds, and promotes other molecules to exert lubricating properties.

The effective effects of the present invention are: (1) The present invention can form a hydrated molecular network structure through the chemical synergy between different molecules, and can form a reliable water-based lubricating film between the surfaces of the friction pairs. When the water-based lubricating film is squeezed The pressure will generate hydration repulsion force, bear the load and reduce the solid contact of the friction surface, thereby reducing the wear amount of the titanium alloy friction pair and reducing the friction force generated by the solid friction; (2) After the present invention is added to the contact point of the titanium alloy friction pair , can be combined with the surface molecules of the friction pair through chemical action to form a hydrated molecular adhesion layer. The hydrated molecular adhesion layer has the characteristics of low shear strength. When shearing motion occurs, the resistance to the friction surface is small, resulting in extremely Small friction force; (3) The components of the present invention are all environmentally friendly compounds, the waste after use is easy to handle, and it will not cause pollution when discharged into the environment, so it is a new type of green and environment-friendly lubricant.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the graph of the friction coefficient of the water-based lubricating composition prepared by Example 1 as a function of time;

Fig. 2 is the graph of the friction coefficient of the water-based lubricating composition prepared by Example 2 as a function of time;

Fig. 3 is the graph of the friction coefficient of the water-based lubricating composition prepared by Example 3 as a function of time;

Fig. 4 is the graph of the friction coefficient of the water-based lubricating composition prepared by Example 4 as a function of time;

Fig. 5 is the graph of the coefficient of friction of the water-based lubricating composition prepared in Example 5 as a function of time;

6 is a graph of the coefficient of friction of the water-based lubricating composition prepared in Example 6 as a function of time.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1. Formulating a water-based lubricating composition

Prepare 400 grams of water-based lubricating composition according to the following steps, the preparation environment is room temperature environment, and the air humidity is 40-50%;

The composition is formulated according to the components and the parts by weight of the components listed in Table 1. First, weigh the required weight of hydroxyethyl cellulose, pour it into a beaker with a capacity of 500 ml, and then add the required weight of hydroxyethyl cellulose. Deionized water, stir immediately after adding deionized water to ensure that the hydroxyethyl cellulose powder is quickly dissolved in the deionized water to prevent the hydroxyethyl cellulose powder from agglomerating. Use a mixer to continue stirring at a constant speed for 30 minutes until the mixed solution is clear and transparent. Then, the required weight of silane compound, acid compound, alcohol compound and titanate coupling agent were added to the transparent solution in turn, and then the mixed solution was placed in a constant temperature water bath (80°C) for 30 minutes and kept continuously for 30 minutes. Stir to obtain a water-based lubricating composition, the weight parts of the components and components in Examples 1-6 are shown in Table 1, wherein the "remainder" refers to the remaining amount of 100 parts by weight of the total composition.

Table 1 Examples 1-6 Components and Parts by Weight of Components

Note: HCTS is hexamethylcyclotrisiloxane; APTES is 3-aminopropyltriethoxysilane; TSP is isopropyl titanate; DET is chelated 200 type titanate.

2. Performance testing

The water-based lubricating composition prepared according to the experimental examples 1-6 in Table 1 was added to the contact surface of the friction pair, and the friction and wear experiment was carried out in the form of rotational friction, and the friction coefficient variation curve, the wear amount and the surface of the test sample were recorded. roughness. At room temperature, the test pressure is 4.0 N, the test time is 20 minutes, and the test line speed is 62.8mm/s when the friction and wear characteristics are tested. At the end of the test, the friction coefficient curve of Experimental Example 1-6 was obtained, as shown in Figure 1-6, the average friction coefficient of Experimental Example 1-6 was calculated, and the results were shown in Table 2; before the test, the titanium alloy sample was weighed, After the test, the wear amount of the sample was calculated, and the surface roughness of the friction part of the titanium alloy was tested at the same time. The results are shown in Table 2.

Table 2 Friction and wear test data

Experimental example test load Test line speed average coefficient of friction L Surface roughness 1 4.0 cattle 62.8mm/s 0.054 4.6g 14.2μm 2 4.0 cattle 62.8mm/s 0.035 4.2g 12.5μm 3 4.0 cattle 62.8mm/s 0.032 4.1g 9.0μm 4 4.0 cattle 62.8mm/s 0.026 3.8g 8.1μm 5 4.0 cattle 62.8mm/s 0.038 4.2g 9.3μm 6 4.0 cattle 62.8mm/s 0.045 4.4g 10.6μm

From the results in Table 2 and Figures 1-6, it can be seen that when the experimental examples 1-6 disclosed in the present invention are used as water-based lubricating compositions as lubricating fluids, lower average friction coefficient and wear amount can be obtained, among which experimental example 4 The friction coefficient is as low as 0.026, the wear amount is 3.8g, and the surface roughness of the titanium alloy is very low after friction and wear. cost, reduce pollution, have important economic value and social significance.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (3)

1. A water-based lubricating composition for a titanium alloy friction pair is characterized by comprising the following components in parts by weight:

hydroxyethyl cellulose: 0.01-4 parts, said hydroxyethyl cellulose having a kinematic viscosity of 80-125 mPa-s, conditions of 25 ℃, 2.00 wt.%;

silane compound: 0.01-6 parts of silane compound, wherein the silane compound is one or a mixture of hexamethylcyclotrisiloxane, 3-aminopropyltriethoxysilane and aminopropyltrimethoxysilane;

acid compound: 0.01-4 parts of acid compound, wherein the acid compound is one or a mixture of boric acid, phosphoric acid, hydrochloric acid and sulfuric acid;

alcohol compounds: 0.01-4 parts of alcohol compound, wherein the alcohol compound is one or a mixture of more of 1-propanol, 1, 2-propylene glycol, glycerol, 1, 4-butanediol and 1, 5-pentanediol;

titanate coupling agent: 0.01-1 part of titanate coupling agent, wherein the titanate coupling agent is one or a mixture of isopropyl titanate, chelate 100 type titanate and chelate 200 type titanate;

water: 81-96 parts of deionized water.

2. A water-based lubricating composition for a titanium alloy friction pair is characterized by comprising the following components in parts by weight:

hydroxyethyl cellulose: 3.0 parts, the dynamic viscosity of the hydroxyethyl cellulose is 80-125 mPa-s, with the conditions of 25 ℃, 2.00 wt.%;

silane compound: 0.1 part of hexamethylcyclotrisiloxane and 6 parts of 3-aminopropyltriethoxysilane;

acid compound: 0.3 part of boric acid and 0.1 part of sulfuric acid;

alcohol compounds: 1.0 part of glycerol;

titanate coupling agent: 0.2 part isopropyl titanate and 0.2 part chelate 200 titanate; the balance being deionized water, the balance being the balance of 100 parts by weight of the total composition.

3. A water-based lubricating composition for a titanium alloy friction pair is characterized by comprising the following components in parts by weight:

hydroxyethyl cellulose: 4.0 parts, said hydroxyethyl cellulose having a kinematic viscosity of 80-125 mPa-s, provided that at 25 ℃, 2.00 wt.%;

silane compound: 0.1 part of hexamethylcyclotrisiloxane and 6 parts of 3-aminopropyltriethoxysilane;

acid compound: 3.7 parts of boric acid and 0.1 part of sulfuric acid;

alcohol compounds: 1.0 part of glycerol;

titanate coupling agent: 0.1 part isopropyl titanate and 0.2 part chelate 200 titanate; the balance being deionized water, the balance being the balance of 100 parts by weight of the total composition.

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