CN113801522B - Bolt anti-seizing liquid medicine and preparation method thereof - Google Patents

Abstract

The application relates to the technical field of bolt liquid medicine, and particularly discloses bolt anti-seize liquid medicine and a preparation method thereof. The bolt anti-seizing liquid medicine comprises the following raw materials in parts by mass: 5-10 parts of ethyl cellulose, 44-90 parts of solvent, 0.5-2 parts of wetting agent, 1-3 parts of dispersing agent, 1.3-4.6 parts of chromic acid, 1-4 parts of silane coupling agent and 0.2-1 part of modifying agent. Wherein the solvent is a solution obtained by mixing ethanol, tetrahydrofuran and toluene. The pollution of the liquid medicine to the equipment is reduced while the anti-seizing effect of the liquid medicine to the bolt is improved.

Description

Anti-seizing liquid medicine for bolt and preparation method thereof

Technical Field

The application relates to the technical field of bolt liquid medicine, in particular to bolt anti-seize liquid medicine and a preparation method thereof.

Background

The bolt is a cylindrical threaded fastener with a nut. Because bolt installation and dismantlement are all comparatively convenient, consequently the fastening mode between each structure is mostly bolted connection in mechanical device.

However, the situation of thread seizure easily occurs in the process of bolt connection, so that the bolt is difficult to rotate, and the bolt is loosened or difficult to disassemble. The bolt is seized mainly because the friction of the screw thread generates instant high temperature in the locking process of the bolt, which easily causes the metal fusion to generate the sticking phenomenon. Meanwhile, when the bolt is tightened, the oxide film is easily damaged by pressure generated between the contacted thread surfaces, so that the metal contact points are peeled off, and the bolt is further seized.

The bolt is prevented from being seized by mainly coating liquid medicine on the bolt, the liquid medicine is lubricating grease which is commonly used, and impurities and dust are easily attached to the lubricating grease due to the fact that the lubricating grease is sticky, so that equipment is easily polluted.

Disclosure of Invention

In order to improve the anti-seize effect of liquid medicine on the bolt and reduce the pollution of the liquid medicine on equipment, the application provides the anti-seize liquid medicine for the bolt and the preparation method thereof.

First aspect, the application provides a dead liquid medicine is prevented stinging by bolt adopts following technical scheme:

the bolt anti-seizing liquid medicine comprises the following raw materials in parts by mass: 5-10 parts of ethyl cellulose, 44-90 parts of solvent, 0.5-2 parts of wetting agent, 1-3 parts of dispersing agent, 1.3-4.6 parts of chromic acid, 1-4 parts of silane coupling agent and 0.2-1 part of modifier;

wherein the solvent is a solution obtained by mixing ethanol, tetrahydrofuran and toluene.

By adopting the technical scheme, the ethyl cellulose is a water-insoluble cellulose derivative, the ethyl cellulose can form a solution with certain viscosity after being dissolved in the solvent, and the lubricating effect of the solution is better. The bolt is soaked by the solution, and after the soaked bolt is dried, an organic film can be formed on the surface of the bolt, so that the lubricating and wear-resisting effects of the surface of the bolt are improved, the friction force generated in the bolt tightening process is reduced, and the anti-seizing effect of the liquid medicine on the bolt is improved. Meanwhile, chromic acid can oxidize metal atoms on the surface of the bolt, so that chromium hydroxide colloid is deposited on the surface of the bolt, the chromium hydroxide colloid adsorbs free hexavalent chromium ions to form a passivation film, and the passivation film has good wear resistance and lubricating performance, so that the friction force generated in the bolt tightening process is reduced, and the anti-seizing effect of the liquid medicine on the bolt is improved. In the process of forming the organic film and the passive film, the silane coupling agent can generate coupling action with ethoxy in the organic film and metal ions in the passive film, so that the organic film and the passive film are crosslinked to a certain degree, a composite film with more excellent wear resistance and lubricating property is formed, and the anti-seizing effect of the liquid medicine on the bolt is further improved. Meanwhile, the liquid medicine is not directly coated on the bolt or equipment, but is used for drying the bolt after soaking the bolt for a period of time, so that a wear-resistant and smooth film is formed on the surface of the bolt, the effect of reducing bolt seizure is achieved, the pollution of the liquid medicine to the bolt and the equipment is small, and the application range is wide.

The solution prepared by compounding ethanol, tetrahydrofuran and toluene is used as a solvent, and the ethyl cellulose with ethanol and toluene with the p-ethoxy content of more than 46% has a good dissolving effect, while the ethyl cellulose with tetrahydrofuran with the p-ethoxy content of less than 46% has a good dissolving effect, so that the dissolving effect of the ethyl cellulose can be effectively improved after the three components are compounded. Meanwhile, the dissolving effect of the ethyl cellulose is further improved by the dispersing agent, the wetting effect of the prepared finished product liquid medicine on the bolt is improved by adding the wetting agent, and the film forming efficiency is improved. Meanwhile, the film forming quality and the film forming efficiency of the passive film are improved through the modifier.

Preferably, the ethyl cellulose has an ethoxy content of 44% to 49%.

By adopting the technical scheme, the ethyl cellulose with the ethoxy content of 44-49% has moderate viscosity and good film forming effect.

Preferably, the polymerization degree of the ethylcellulose is n = (7 to 12).

By adopting the technical scheme, the ethyl cellulose with the polymerization degree of n = (7-12) has moderate viscosity and good film forming effect, and the ethyl cellulose with the polymerization degree has good solubility in a solvent.

Preferably, the mass ratio of ethanol to tetrahydrofuran to toluene in the solvent is 5.

By adopting the technical scheme, the ethyl cellulose with ethanol and toluene with the p-ethoxy content higher than 46% has a better dissolving effect, and the ethyl cellulose with tetrahydrofuran with the p-ethoxy content lower than 46% has a better dissolving effect; meanwhile, the solvent prepared by compounding ethanol, tetrahydrofuran and toluene according to the mass ratio of 5.

Preferably, the wetting agent is one or more of phosphate, soybean lecithin and sulfonated oil.

By adopting the technical scheme, the phosphate is an ester derivative of phosphoric acid, the soybean lecithin is a byproduct in the process of refining soybean oil, and the sulfonated oil is prepared by sulfonating high-quality natural mineral oil by sulfur trioxide gas-phase membrane. The three components all belong to surfactants, have the functions of wetting, dispersing and lubricating, and can better spread or penetrate a solvent on the surface of a solid material by reducing the surface tension or the interfacial tension of the solid so as to achieve the effect of wetting the solid.

Preferably, the dispersing agent is one or more of hexenyl bis stearamide, stearamide and polyethylene glycol.

By adopting the technical scheme, the powder of the hexenyl bis stearamide has strong greasy feeling, can improve the dispersion effect of each component, and can generate a synergistic effect with other lubricants, thereby improving the lubricating effect of a system. The stearamide can improve the dispersing effect of various additives, has an excellent external lubricating effect and can improve the lubricating effect of a system. The polyethylene glycol has excellent lubricity, moisture retention and dispersibility, and can improve the lubricating effect of a system while improving the dispersibility of other additives.

Preferably, the modifier is a mixture of colloidal silica and sodium fluoride according to a mass ratio of 2.

By adopting the technical scheme, the colloidal silicon dioxide has good adsorbability under the influence of self hydroxyl, and the adhesive force of the passive film can be effectively improved, so that the passive film is more stable. The sodium fluoride can reduce the surface tension of the passivation solution, thereby improving the film forming efficiency of the passivation film and promoting the passivation film to be more uniform. After the two are mixed according to the mass ratio of 2.

Preferably, the silane coupling agent is one or more of KH-550, KH-560 and KH-570.

By adopting the technical scheme, the silane coupling agent is an organic silicon monomer with more than two different reactive groups in the molecule, and KH-550, KH-560 and KH-570 can enable the organic film and the passive film to be crosslinked to a certain degree in the film forming process, so that the composite film with better lubricating and wear-resisting effects is formed.

In a second aspect, the application provides a preparation method of a bolt anti-seize liquid medicine, which adopts the following technical scheme: a preparation method of a bolt anti-seizure liquid medicine comprises the following steps:

preparing a solvent: mixing ethanol, tetrahydrofuran and toluene in a certain ratio to obtain a solvent;

dissolving: adding ethyl cellulose, a dispersing agent and a wetting agent into a solvent, and fully stirring and dissolving to prepare a mixed solution for later use;

mixing: and mixing and stirring the mixed solution, chromic acid, the modifier and the coupling agent uniformly to obtain a finished product.

By adopting the technical scheme, the ethyl cellulose, the dispersing agent and the wetting agent are added into the compounded solvent for mixing and stirring, the dissolving effect of the ethyl cellulose can be effectively improved, and finally, the ethyl cellulose, the chromic acid, the modifying agent and the silane coupling agent are mixed and stirred uniformly, so that the insoluble substances in the prepared finished product solution are less. When the finished product solution is used, insoluble substances attached to the surface of the bolt can be reduced, so that the situation that the insoluble substances influence the rotation of the bolt is reduced, the smoothness of a film formed on the surface of the bolt is better, and the effect of reducing the seizure of the bolt is achieved.

In summary, the present application has the following beneficial effects:

1. according to the preparation method, ethyl cellulose is dissolved in a compounded solvent to obtain a mixed solution with viscosity and lubrication degree, an organic film can be formed on the surface of the bolt by the mixed solution, and the lubricating and wear-resisting effects of the organic film are good; meanwhile, chromic acid is added, so that metal atoms on the surface layer of the bolt can be oxidized, a passivation film is formed on the surface of the bolt, and the lubricating and wear-resisting effects of the surface of the bolt are further improved; in the film forming process of the organic film and the passive film, the organic film and the passive film are crosslinked to a certain degree under the coupling action of the silane coupling agent, so that a composite film with better wear-resisting and lubricating effects is obtained, the anti-seizing effect of the liquid medicine on the bolt is improved, and the pollution of the liquid medicine on equipment is reduced.

2. The ethyl cellulose with the ethoxy content of 44% -49% is preferably adopted in the application, the ethyl cellulose with the ethoxy content has moderate viscosity and good film forming effect, and the prepared finished liquid medicine has better anti-seizure performance.

3. The colloidal silicon dioxide is added, so that the adhesive force of the passivation film is improved by utilizing the good adsorption effect of the colloidal silicon dioxide; meanwhile, the surface tension of the passivation solution is reduced through the sodium fluoride, the film forming efficiency of the passivation film is improved, the passivation film is more uniform, and the anti-seizing performance of the prepared finished product liquid medicine is better.

Detailed Description

The present application will be described in further detail with reference to examples.

The raw materials used in the preparation examples, examples and comparative examples of the present application are all commercially available, wherein ethyl cellulose is produced by shanghai hercule chemical ltd;

the sulfonated oil is produced from Jinxin chemical industry Co., ltd, jinan, with the product number of 065;

polyethylene glycol is produced in Jinanteng chemical industry Co., ltd, and the product number is 25322-68-3;

colloidal silica is available from Shanghai Hepu industries, inc. under the trade designation 200PHARM;

the hexenyl-bis-stearamide is produced by Shandong Chuangying chemical Co., ltd, and has a product number of 196;

soybean egg curdlan is produced by Wuhan Bingde Biotech Co., ltd, cat # 022.

Preparation examples

Preparation example 1

Ethanol, tetrahydrofuran, and toluene were prepared in a mass ratio of 5.

Wherein the volume fraction of the ethanol is 99 percent of ethanol aqueous solution.

Preparation example 2

Ethanol, tetrahydrofuran, and toluene were prepared in a mass ratio of 5.

Preparation example 3

Ethanol, tetrahydrofuran and toluene were prepared in a mass ratio of 5.

Preparation example 4

Ethanol, tetrahydrofuran, and toluene were prepared in a mass ratio of 5.

Preparation example 5

Ethanol, tetrahydrofuran and toluene were prepared in a mass ratio of 5.

Preparation example 6

Ethanol, tetrahydrofuran and toluene were prepared in a mass ratio of 1.

Preparation example 7

Ethanol, tetrahydrofuran, and toluene were prepared in a mass ratio of 3.

Preparation example 8

Ethanol, tetrahydrofuran and toluene were prepared in a mass ratio of 3.

Examples

The following examples 1 to 5 are given as examples.

Example 1

The bolt anti-seizing liquid medicine comprises the following raw materials in parts by mass: 5kg of ethyl cellulose, 72kg of solvent, 0.5kg of wetting agent, 1kg of dispersing agent, 1.3kg of chromic acid, 1kg of silane coupling agent and 0.2kg of modifying agent.

Wherein the content of ethoxy in the ethyl cellulose is 45.5-48%, and the polymerization degree is n =10;

the solvent is the solvent prepared in the preparation example 1;

the wetting agent is sulfonated oil;

the dispersant is polyethylene glycol;

the silane coupling agent is KH-560;

the modifier is a mixture obtained by mixing colloidal silica and sodium fluoride according to a mass ratio of 2.

The preparation method of the bolt anti-seizing liquid medicine comprises the following steps:

s1, dissolving: adding ethyl cellulose, a dispersing agent and a wetting agent into a solvent, fully stirring and dissolving at the stirring speed of 1000rpm and the stirring temperature of 35 ℃ to prepare a mixed solution for later use;

s2, mixing: and mixing and stirring the mixed solution, chromic acid, the modifier and the silane coupling agent uniformly at the stirring speed of 800rpm and the stirring temperature of 30 ℃ to obtain a finished product.

As shown in Table 1, examples 1 to 5 are different in the amounts of the respective materials of the bolt anti-galling agents.

Table 1 table of medicinal liquid raw material components

Example 6

This example is different from example 3 in that the solvent was the solvent prepared in preparation example 2.

Example 7

This example is different from example 3 in that the solvent is the solvent prepared in preparation example 3.

Example 8

This example differs from example 3 in that the solvent was the solvent prepared in preparation example 4.

Example 9

This example is different from example 3 in that the solvent was the solvent prepared in preparation example 5.

Example 10

This example differs from example 3 in that the solvent was the solvent prepared in preparation example 6.

Example 11

This example differs from example 3 in that the solvent was the solvent prepared in preparation example 7.

Example 12

This example differs from example 3 in that the solvent was the solvent prepared in preparation example 8.

Example 13

This example differs from example 3 in that the ethylcellulose has an ethoxy content of 37% to 40%.

Example 14

This example differs from example 3 in that the ethyl cellulose has an ethoxy content of 52% to 54%.

Example 15

This example is different from example 3 in that the degree of polymerization of ethyl cellulose is n =7.

Example 16

This example is different from example 3 in that the degree of polymerization of ethyl cellulose is n =12.

Example 17

This example differs from example 3 in that the wetting agent is soy lecithin.

Example 18

This example differs from example 3 in that the dispersant is hexenyl bis stearamide.

Example 19

This example is different from example 3 in that the silane coupling agent is KH-550.

Example 20

This example is different from example 3 in that the silane coupling agent is KH-570.

Comparative example

Comparative example 1

This comparative example differs from example 3 in that the ethylcellulose was replaced by an equal amount of methylcellulose.

Comparative example 2

This comparative example differs from example 3 in that the solvent was replaced by an equal amount of 99% ethanol.

Comparative example 3

This comparative example differs from example 3 in that the solvent was replaced with an equal amount of tetrahydrofuran.

Comparative example 4

This comparative example differs from example 3 in that the chromic acid is replaced by an equal amount of oxalic acid.

Comparative example 5

This comparative example differs from example 3 in that no chromic acid is added.

Comparative example 6

This comparative example differs from example 3 in that no ethylcellulose was added.

Comparative example 7

This comparative example differs from example 3 in that no silane coupling agent was added.

Comparative example 8

This comparative example differs from example 3 in that the silane coupling agent is replaced by the same amount of titanate coupling agent.

Comparative example 9

One bolt anti-seize liquid medicine in the related art is molybdenum disulfide lubricating grease.

Performance test

Test methods: 30L of the liquid medicines prepared in the examples 1-20 and the comparative examples 1-9 are respectively taken, and bolts and nuts which are produced in the same batch and are qualified in quality are selected, and 1 bolt and 1 nut are taken as a group. Under the same environment, 100 groups of bolt and nut are respectively added into the liquid medicines prepared in the examples 1-20 and the comparative examples 1-9, and the liquid medicines are soaked for 1 hour and then dried for 10 minutes at the drying temperature of 50 ℃. And respectively screwing each group of bolt and nuts by using automatic screw screwing equipment, repeatedly screwing for 10 times, stopping continuously screwing when the bolt is seized for the first time in the screwing operation, and recording the seized condition of the bolt. And recording the number of groups of 100 groups of bolts in each liquid medicine in which the bolts are seized, and calculating the seizing rate of the bolts.

Bolt seizure rate (%) = (A/100) × 100%

Wherein A is the number of groups of bolt and nut which are soaked in the same liquid medicine and have bolt seizure in the screwing process.

Table 2 table of performance testing data

As can be seen from table 2, by combining the test results of examples 1 to 5 and comparative example 9, the bolt anti-galling lotion prepared by the present application can effectively reduce the occurrence of galling of the bolt, and example 3 is a preferred example, i.e., the lotion has the best anti-galling effect on the bolt.

According to the test results of the embodiment 3, the embodiment 6-12 and the comparative embodiment 2-3, the solvent prepared by compounding the ethanol, the tetrahydrofuran and the toluene can effectively improve the anti-seizing effect of the bolt, and the solvent obtained by compounding the ethanol, the tetrahydrofuran and the toluene according to the mass ratio of 5.

By combining the test results of example 3 and comparative examples 1 and 4-6, it can be seen that adding ethyl cellulose and chromic acid into the chemical solution can effectively reduce the bolt seizure, and that adding the chemical solutions into both can best reduce the bolt seizure.

Combining the test results of example 3 and comparative examples 7-8, it is known that the silane coupling agent can enhance the crosslinking effect between the organic film and the passive film, so that the lubricating and wear-resisting effects of the composite film formed on the surface of the bolt are better, and the anti-seizing effect of the bolt is further improved.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (6)

1. The utility model provides a dead liquid medicine of bolt anti-bite which characterized in that: the anti-seizure liquid medicine is prepared from the following raw materials in parts by mass: 5-10 parts of ethyl cellulose, 44-90 parts of solvent, 0.5-2 parts of wetting agent, 1-3 parts of dispersing agent, 1.3-4.6 parts of chromic acid, 1-4 parts of silane coupling agent and 0.2-1 part of modifying agent;

wherein the solvent is a solution obtained by mixing ethanol, tetrahydrofuran and toluene, and the modifier is a mixture of colloidal silica and sodium fluoride according to a mass ratio of 2; the wetting agent is one or more of phosphate, soybean lecithin and sulfonated oil; the dispersing agent is one or more of hexenyl bis stearamide, stearamide and polyethylene glycol.

2. The bolt anti-galling liquid medicine according to claim 1, wherein: the ethyl cellulose has an ethoxy content of 44% -49%.

3. The chemical liquid for preventing bolt from seizing as claimed in claim 1, wherein: the polymerization degree of the ethyl cellulose is n = (7 to 12).

4. The chemical liquid for preventing bolt from seizing as claimed in claim 1, wherein: the mass ratio of ethanol, tetrahydrofuran and toluene in the solvent is 5.

5. The chemical liquid for preventing bolt from seizing as claimed in claim 1, wherein: the silane coupling agent is one or more of KH-550, KH-560 and KH-570.

6. A method of preparing the bolt anti-galling lotion according to any one of claims 1 to 5, characterized by: the preparation method comprises the following steps:

preparing a solvent: compounding ethanol, tetrahydrofuran and toluene in a certain proportion to obtain a solvent;

dissolving: adding ethyl cellulose, a dispersing agent and a wetting agent into a solvent, and fully stirring and dissolving to prepare a mixed solution for later use;

mixing: and mixing and stirring the mixed solution, chromic acid, a modifier and a coupling agent uniformly to obtain a finished product.