阅读说明：本技术 一种耐酸碱泵用耐腐蚀润滑油 (Acid and alkali resistant corrosion-resistant lubricating oil for pumps ) 是由 申慧君 于 2019-10-10 设计创作，主要内容包括：本发明涉及润滑油技术领域,具体涉及一种耐酸碱泵用耐腐蚀润滑油,包括PTFE微粉表面改性、石墨/PTFE复合粉末制备、石墨/PTFE复合粉末改性和润滑油原料混合制备四个步骤；本发明制备的润滑油与现有的润滑油相比,具有较高的耐腐蚀性,能够满足耐酸碱泵适用的恶劣环境,通过对石墨/PTFE复合粉末进行亲油性改性,使得在基础油中分散均匀,不出现团聚现象,耐磨性能好,使用寿命长,另外通过科学配比加入的各种辅助添加剂,使得本润滑油的抗氧化性、耐高温性、抗乳化性均高于市场上普通的润滑油,不仅适用于耐酸碱泵,而且还可作为其他齿轮、轴承等部件的润滑油。(The invention relates to the technical field of lubricating oil, in particular to acid and alkali resistant corrosion-resistant lubricating oil for a pump, which comprises four steps of PTFE micro powder surface modification, graphite/PTFE composite powder preparation, graphite/PTFE composite powder modification and lubricating oil raw material mixing preparation; compared with the existing lubricating oil, the lubricating oil prepared by the invention has higher corrosion resistance, can meet the severe environment suitable for an acid-base pump, is uniformly dispersed in base oil without agglomeration through lipophilic modification on graphite/PTFE composite powder, has good wear resistance and long service life, and has higher oxidation resistance, high temperature resistance and emulsification resistance than the common lubricating oil in the market through various auxiliary additives added in scientific proportion, thereby being suitable for the acid-base pump and also being used as the lubricating oil for other parts such as gears, bearings and the like.)

1. The acid and alkali resistant corrosion-resistant lubricating oil for the pump is characterized by comprising the following steps of:

(1) surface modification of PTFE micropowder: soaking 5-7 parts by weight of PTFE micro powder into a sodium-naphthalene treatment solution in an environment with nitrogen as protective gas, stirring for 20-25 s, taking out, immediately washing residual liquid on the surface of the PTFE micro powder with acetone, and then volatilizing and airing at room temperature;

(2) preparing graphite/PTFE composite powder: putting the PTFE micro powder modified in the step (1) into plasma spraying equipment to spray a graphite plate, wherein the power of the plasma spraying equipment is 25KW, the spraying distance between a spray gun and the graphite plate is 50-60 cm, meanwhile, applying an alternating voltage of 25-40 kv at two ends of the graphite plate, taking out the graphite plate after the spraying is finished, scraping a composite spraying layer with the weight part of 14-20 parts, and then putting the graphite plate into a grinding machine to grind the graphite plate into powder with the particle size of 2-20 um;

(3) modification of graphite/PTFE composite powder: the graphite/PTFE composite prepared in the step (2) is radiated for 30-42 min under 60Co source gamma rays, the radiation dose is 120-140 Gy/min, then the radiated graphite/PTFE composite powder is immediately placed into a methyl benzoate/absolute ethyl alcohol mixed solution with the weight 2-3 times of that of the graphite/PTFE composite powder, sufficient nitrogen is introduced into the methyl benzoate/absolute ethyl alcohol mixed solution, the mixture is heated to 55-70 ℃ and reacts for 3-4 h, and then the graphite/PTFE composite powder is taken out;

(4) mixing and preparing lubricating oil raw materials: mixing the graphite/PTFE composite powder prepared in the step (3) with 220-260 parts of base oil, 30-50 parts of modified silicone oil, 6-10 parts of molybdenum thiophosphate and 4-7 parts of calcium lignosulfonate, heating to 110-120 ℃, stirring at the rotating speed of 300-500 r/min for 15-30 min, cooling to 5-10 ℃, standing for 10-16 h, then adding 3-5 parts of ammonium borate, 4-6 parts of methyl dimethacrylate and 2-4 parts of nano copper powder, heating to 65-80 ℃, and stirring at the rotating speed of 450-600 r/min for 1-2 h to obtain the composite material.

2. The corrosion-resistant lubricating oil for acid and alkali resistant pumps of claim 1, which is characterized in that: the particle size of the PTFE micropowder is 10-120 um.

3. The corrosion-resistant lubricating oil for acid and alkali resistant pumps of claim 1, which is characterized in that: the thickness of the composite spraying layer in the step (2) is 180-320 um, and the mass ratio of graphite to PTFE in the prepared graphite/PTFE composite powder is 1.5-2: 1.

4. the corrosion-resistant lubricating oil for acid and alkali resistant pumps of claim 1, which is characterized in that: the mass ratio of the methyl benzoate to the absolute ethyl alcohol in the methyl benzoate/absolute ethyl alcohol mixed solution in the step (3) is 1: 3 to 5.

5. The corrosion-resistant lubricating oil for acid and alkali resistant pumps of claim 1, which is characterized in that: the viscosity index of the base oil in the step (4) is 90-110.

6. The corrosion-resistant lubricating oil for acid and alkali resistant pumps of claim 1, which is characterized in that: the modified silicone oil in the step (4) is polyether modified silicone oil formed by graft copolymerization of polyether and dimethyl siloxane.

Technical Field

The invention relates to the technical field of lubricating oil, in particular to corrosion-resistant lubricating oil for an acid and alkali resistant pump.

Background

The acid-alkali resistant pump is a pump made of special materials, is widely applied to the fields of metallurgy, electric power, papermaking, food, pharmacy, synthetic fiber and the like, and mainly plays a role in conveying corrosive media or media which are not allowed to be polluted. Because the conveying material has high corrosion resistance, the lubricating oil coated inside the corrosion-resistant pump is required to have extremely strong corrosion resistance, and if the corrosion resistance of the lubricating oil is insufficient, the performance of the whole lubricating oil is easily reduced, the machine body is damaged, and the service life of the soda-milk pump is greatly shortened.

The invention with the patent number of CN104031730B discloses corrosion-resistant vehicle lubricating oil which is prepared from the following components in parts by weight: 30-50 parts of modified nano-diamond, 50-70 parts of base oil, 20-30 parts of organic molybdenum mixture, 10-20 parts of preservative, 15-30 parts of detergent and 10-20 parts of dispersant. Although the lubricating oil prepared by the invention is added with the preservative, the corrosion resistance effect is limited, and the lubricating oil cannot be suitable for the service environment of an acid-base resistant pump. At present, although some lubricating oil is added with polytetrafluoroethylene powder to enhance the corrosion resistance of the lubricating oil, so that the lubricating oil can be used in a severe environment, the polytetrafluoroethylene powder cannot be uniformly dispersed in the lubricating oil due to the insufficient performance of the polytetrafluoroethylene powder, so that the wear resistance of the lubricating oil is reduced, and the service life of the lubricating oil is shortened. Therefore, the invention provides a lubricating oil special for an acid-base resistant pump, which has strong corrosion resistance, aiming at the defects of the existing lubricating oil in corrosion resistance and wear resistance.

Disclosure of Invention

The invention aims to solve the technical problem of designing the corrosion-resistant lubricating oil for the acid-base resistant pump so as to solve the problem of insufficient corrosion resistance when the conventional lubricating oil is used in the acid-base resistant pump.

The invention is realized by the following technical scheme:

the acid and alkali resistant corrosion-resistant lubricating oil for the pump comprises the following steps:

(1) surface modification of PTFE micropowder: soaking 5-7 parts by weight of PTFE micro powder into a sodium-naphthalene treatment solution in an environment with nitrogen as protective gas, stirring for 20-25 s, taking out, immediately washing residual liquid on the surface of the PTFE micro powder with acetone, and then volatilizing and airing at room temperature;

(2) preparing graphite/PTFE composite powder: putting the PTFE micro powder modified in the step (1) into plasma spraying equipment to spray a graphite plate, wherein the power of the plasma spraying equipment is 25KW, the spraying distance between a spray gun and the graphite plate is 50-60 cm, meanwhile, applying an alternating voltage of 25-40 kv at two ends of the graphite plate, taking out the graphite plate after the spraying is finished, scraping a composite spraying layer with the weight part of 14-20 parts, and then putting the graphite plate into a grinding machine to grind the graphite plate into powder with the particle size of 2-20 um;

(3) modification of graphite/PTFE composite powder: the graphite/PTFE composite prepared in the step (2) is radiated for 30-42 min under 60Co source gamma rays, the radiation dose is 120-140 Gy/min, then the radiated graphite/PTFE composite powder is immediately placed into a methyl benzoate/absolute ethyl alcohol mixed solution with the weight 2-3 times of that of the graphite/PTFE composite powder, sufficient nitrogen is introduced into the methyl benzoate/absolute ethyl alcohol mixed solution, the mixture is heated to 55-70 ℃ and reacts for 3-4 h, and then the graphite/PTFE composite powder is taken out;

(4) mixing and preparing lubricating oil raw materials: mixing the graphite/PTFE composite powder prepared in the step (3) with 220-260 parts of base oil, 30-50 parts of modified silicone oil, 6-10 parts of molybdenum thiophosphate and 4-7 parts of calcium lignosulfonate, heating to 110-120 ℃, stirring at the rotating speed of 300-500 r/min for 15-30 min, cooling to 5-10 ℃, standing for 10-16 h, then adding 3-5 parts of ammonium borate, 4-6 parts of methyl dimethacrylate and 2-4 parts of nano copper powder, heating to 65-80 ℃, and stirring at the rotating speed of 450-600 r/min for 1-2 h to obtain the composite material.

Preferably, the particle size of the PTFE micropowder is 10-120 um.

Preferably, the thickness of the composite spraying layer in the step (2) is 180-320 um, and the mass ratio of graphite to PTFE in the prepared graphite/PTFE composite powder is 1.5-2: 1.

preferably, the mass ratio of the methyl benzoate to the absolute ethyl alcohol in the methyl benzoate/absolute ethyl alcohol mixed solution in the step (3) is 1: 3 to 5.

Preferably, the viscosity index of the base oil in the step (4) is 90-110.

Preferably, the modified silicone oil in step (4) is polyether modified silicone oil formed by graft copolymerization of polyether and dimethyl siloxane.

The lubricating oil of the invention is found through a large number of experimental researches that the surface modification is firstly carried out on PTFE micro powder by using sodium-naphthalene treatment liquid, so that fluorine atoms on a polytetrafluoroethylene molecular chain are removed, carbonization and C-OH polar groups are generated, the surface energy of the PTFE micro powder is greatly increased, then the PTFE micro powder is sprayed and covered on a graphite plate with larger current by plasma spraying equipment, the van der Waals force between graphite and polytetrafluoroethylene between composite spraying layers is sharply increased due to the directional movement of a large number of electrons on the graphite plate and the larger surface energy of the PTFE micro powder, so that a high polymer of the graphite and the polytetrafluoroethylene is formed, the graphite/PTFE composite powder is subjected to radiation modification after being ground, ester group oleophylic groups are grafted on the molecular chain of the polytetrafluoroethylene, and the dispersibility of the graphite/PTFE composite powder in base oil is greatly increased, the modified graphite/PTFE composite powder is uniformly dispersed in the base oil, so that the corrosion resistance of the lubricating oil can be improved by utilizing the high corrosion resistance of the polytetrafluoroethylene, the agglomeration phenomenon of the graphite in the base oil is reduced, and the wear resistance of the base oil is improved by utilizing the wear resistance of the graphite.

Has the advantages that: compared with the existing lubricating oil, the lubricating oil has higher corrosion resistance, can meet the severe environment suitable for an acid-base resistant pump, and is uniformly dispersed in the base oil without agglomeration, good in wear resistance and long in service life by carrying out lipophilic modification on the graphite/PTFE composite powder; in addition, various auxiliary additives are added in a scientific proportion, so that the oxidation resistance, the high temperature resistance and the emulsification resistance of the lubricating oil are higher than those of common lubricating oil in the market, and the lubricating oil is not only suitable for acid-base resistant pumps, but also can be used as lubricating oil for other parts such as gears, bearings and the like.

Detailed Description