阅读说明：本技术 一种合成抗水型长寿命真空泵油及其制备方法 (Synthetic water-resistant long-life vacuum pump oil and preparation method thereof ) 是由 战红豆 王述申 于 2020-06-16 设计创作，主要内容包括：本申请公开了一种合成抗水型长寿命真空泵油及其制备方法,其中,一种合成抗水型长寿命真空泵油,包括如下重量份数的原料：天然气合成油25～60份、烷基萘基础油25～60份、疏水剂5～10份、油性剂1～3份、抗氧剂1～4份、极压抗磨剂0.5～3份、腐蚀抑制剂0.005～0.2份、防锈剂0.005～0.2份、游离水捕捉剂0.1～0.5份、破乳剂0.03～0.1份、消泡剂0.01～0.05份。本发明利用天然气合成油和烷基萘基础油为基础油组合,组分合理,添加剂感受性好,性能稳定；具有极强的耐水能力、抗乳化耐水解、适用于潮湿环境下工作的真空泵；具有出色的高温抗氧化能力,有效抑制油泥、漆膜、胶质等有害沉积物产生,保持设备清洁性；具有出色的防锈、抗磨、防腐蚀性能,能够全方面保护泵体,延长真空泵的使用寿命。(The application discloses synthetic water-resistant long-life vacuum pump oil and a preparation method thereof, wherein the synthetic water-resistant long-life vacuum pump oil comprises the following raw materials in parts by weight: 25-60 parts of natural gas synthetic oil, 25-60 parts of alkyl naphthalene base oil, 5-10 parts of a water repellent agent, 1-3 parts of an oiliness agent, 1-4 parts of an antioxidant, 0.5-3 parts of an extreme pressure antiwear agent, 0.005-0.2 part of a corrosion inhibitor, 0.005-0.2 part of an antirust agent, 0.1-0.5 part of a free water catcher, 0.03-0.1 part of a demulsifier and 0.01-0.05 part of a defoaming agent. The invention utilizes the natural gas synthetic oil and the alkyl naphthalene base oil as the base oil combination, and has reasonable components, good sensitivity of the additive and stable performance; the vacuum pump has extremely strong water resistance, emulsification resistance and hydrolysis resistance and is suitable for working in a humid environment; the paint has excellent high-temperature oxidation resistance, effectively inhibits the generation of harmful sediments such as oil sludge, paint films, colloid and the like, and keeps the cleanness of equipment; the anti-rust wear-resistant vacuum pump has excellent anti-rust, anti-wear and anti-corrosion performances, can protect the pump body in all aspects, and prolongs the service life of the vacuum pump.)

1. The synthetic water-resistant long-life vacuum pump oil is characterized by comprising the following raw materials in parts by weight: 25-60 parts of natural gas synthetic oil, 25-60 parts of alkyl naphthalene base oil, 5-10 parts of a water repellent agent, 1-3 parts of an oiliness agent, 1-4 parts of an antioxidant, 0.5-3 parts of an extreme pressure antiwear agent, 0.005-0.2 part of a corrosion inhibitor, 0.005-0.2 part of an antirust agent, 0.1-0.5 part of a free water catcher, 0.03-0.1 part of a demulsifier and 0.01-0.05 part of a defoaming agent.

2. The synthetic water-resistant long-life vacuum pump oil as claimed in claim 1, wherein: the hydrophobic agent is polyisobutylene with large molecular weight, the polyisobutylene is PB2400, and the average molecular weight of the PB2400 is 2450.

3. The synthetic water-resistant long-life vacuum pump oil as claimed in claim 1, wherein: the oiliness agent comprises one or more of polyester and fatty acid ester.

4. The synthetic water-resistant long-life vacuum pump oil as claimed in claim 1, wherein: the antioxidant comprises one or more of macromolecular phenol and alkylated diphenylamine, the molecular weight of the macromolecular phenol is 900-1100, and the alkyl C atom number in the alkylated diphenylamine is C₄～C₈。

5. The synthetic water-resistant long-life vacuum pump oil as claimed in claim 1, wherein: the extreme pressure antiwear agent is a low-volatility phosphate ester agent, and the low-volatility phosphate ester agent comprises one or more of butyl triphenyl thiophosphate, nonylated triphenyl thiophosphate, tri (di-tert-butylphenyl) phosphite and triphenyl phosphite.

6. The synthetic water-resistant long-life vacuum pump oil as claimed in claim 1, wherein: the corrosion inhibitor is benzotriazole and derivatives thereof.

7. The synthetic water-resistant long-life vacuum pump oil as claimed in claim 1, wherein: the antirust agent is organic amine or a nitrogen-containing heterocyclic compound.

8. The synthetic water-resistant long-life vacuum pump oil as claimed in claim 1, wherein: the free water catcher is a nonionic surfactant with HLB value less than 10, and the nonionic surfactant is polyoxyethylene ether surfactant with molecular weight more than 500.

9. The synthetic water-resistant long-life vacuum pump oil as claimed in claim 1, wherein: the demulsifier is an oil-soluble nonionic surfactant which is a polymer of ethylene oxide and propylene oxide with the molecular weight of 1500-10000;

the defoaming agent is a silicone defoaming agent, and the silicone defoaming agent is a macromolecular siloxane defoaming agent.

10. A method for preparing a synthetic water-resistant long-life vacuum pump oil according to claim 1, comprising:

s1: adding 45-55 wt% of natural gas synthetic oil and 45-55 wt% of alkyl naphthalene base oil into a blending kettle for stirring, wherein the stirring temperature is 48-52 ℃, and the stirring speed is 90-110 r/min;

s2: sequentially adding a hydrophobic agent, an oiliness agent, an antioxidant, an extreme pressure antiwear agent, a corrosion inhibitor, an antirust agent, a free water capture agent and the remaining natural gas synthetic oil and alkyl naphthalene base oil, and continuously stirring for 1-2 hours;

s3: and sequentially adding a demulsifier and a defoaming agent, stopping heating, continuously stirring and cooling to room temperature to obtain the synthetic water-resistant long-life vacuum pump oil.

Technical Field

The invention relates to the field of vacuum pump lubrication and cooling, in particular to synthetic water-resistant long-life vacuum pump oil and a preparation method thereof.

Background

Vacuum refers to a given volume of gas below atmospheric pressure, i.e., a given volume having less than about two thousand and five billion molecules of gas per cubic centimeter of volume. The vacuum is relative to atmospheric pressure and not the space is free of material. The lowest pressure achieved with modern pumping methods still exists in the hundreds of molecules per cubic centimeter of space.

Vacuum technology is an important fundamental technology for modern scientific research and industrial development. The vacuum film is widely applied to the fields of aerospace, high-energy physics, semiconductors, metallurgy, electric power, automobiles, petrochemical industry, solar energy, environmental engineering, medical and health, food, railway engineering, new energy, ships and the like, according to statistics, nearly one fourth of the global scientific research and industrial production are applied to the vacuum technology, and the vacuum technology gradually changes our lives.

The vacuum oil is special lubricating oil for vacuum obtaining equipment, is one of important basic materials, and the quality of oil products directly influences the limit pressure, the air extraction rate, the back pressure, the oil return rate and the like which can be reached by the vacuum equipment. The mineral oil type vacuum pump oil is currently issued by SH/T0528-1992 in China, the technical conditions of the mineral vacuum pump oil are specified, and the mineral oil type vacuum pump oil is suitable for sealing and lubricating various volume vacuum pumps (mechanical vacuum pumps) and is also suitable for lubricating gear transmission systems of Roots vacuum pumps (mechanical booster pumps). With the innovation of vacuum technology, vacuum pumps are developing towards miniaturization, high speed and refinement, and the use working condition of vacuum oil is more and more severe. The common vacuum pump oil can not meet the increasingly strict requirements of high temperature resistance, hydrolysis resistance and emulsification resistance.

Disclosure of Invention

In order to solve the problems, the application provides synthetic water-resistant long-life vacuum pump oil and a preparation method thereof, wherein the synthetic water-resistant long-life vacuum pump oil comprises the following raw materials in parts by weight: 25-60 parts of natural gas synthetic oil, 25-60 parts of alkyl naphthalene base oil, 5-10 parts of a water repellent agent, 1-3 parts of an oiliness agent, 1-4 parts of an antioxidant, 0.5-3 parts of an extreme pressure antiwear agent, 0.005-0.2 part of a corrosion inhibitor, 0.005-0.2 part of an antirust agent, 0.1-0.5 part of a free water catcher, 0.03-0.1 part of a demulsifier and 0.01-0.05 part of a defoaming agent.

The natural Gas synthetic oil, Gas to Liquid, is a base oil synthesized by using natural Gas as a raw material, and the process basis of the synthesis process is Fischer-Tropsch synthesis. The fischer-tropsch synthesis is a process developed in 1925 by the german chemists franz fisher and hans tolopro to synthesize liquid saturated hydrocarbons and hydrocarbons with synthesis gas (carbon monoxide and hydrogen) as raw material under the conditions of catalyst and proper reaction price adjustment, and the reaction process can be summarized as follows:

(2n+1)H₂+nCO→C_nH_(2n+2)+nH₂O

the natural gas synthetic oil is prepared by oxidizing natural gas molecules into carbon monoxide and hydrogen, and synthesizing liquid saturated long-chain alkane by a Fischer-Tropsch synthesis method. Natural gas is a gaseous low molecular hydrocarbon and non-hydrocarbon gas, the major component being methane, and also containing small amounts of ethane, propane, nitrogen and butane constituents. Compared with petroleum, natural gas has the advantages of pure composition, almost no sulfur, phosphorus and compounds thereof, more reserves, wide resources and the like, the main product of Fischer-Tropsch synthesis is hydrocarbon, the byproducts are carbon oxides and water, the reaction is relatively thorough, and the purification is easy. The natural gas synthetic oil synthesized by the process has the advantages of no sulfur, phosphorus and aromatic hydrocarbon, high saturation degree, high viscosity index, good viscosity-temperature characteristic, excellent oxidation stability and low-temperature performance, low volatility, good emulsification resistance and anti-foaming performance and the like.

The alkyl naphthalene base oil has excellent antioxidant performance, hydrolysis stability, additive solubility and dispersing performance. Research shows that naphthalene rings rich in electrons in alkyl naphthalene base oil can absorb oxygen, thereby interrupting the transmission of an oxidation chain, preventing the continuous oxidation of hydrocarbon and preventing the occurrence of oxidation. A comparison of the antioxidant properties of the different base oils is given in Table 1. As can be seen from the data in the table, the alkyl naphthalene base oil has an extremely outstanding antioxidant performance compared with other base oils. The naphthalene ring structure rich in electrons has strong polarity, good solubility and dispersibility for polar additives, and table 2 shows that the aniline points of different types of base oil are high, the polarity is weak, and the aniline point is low and the polarity is strong. Meanwhile, as can be seen from the data in table 3, unlike the ester base oil, the molecular structure of the alkylnaphthalene has no easily hydrolyzable group, and the hydrolytic stability is good.

TABLE 1 comparison of antioxidant Properties of different types of base oils

Item	Low viscosity alkanes Naphthalene radical	High viscosity Alkyl naphthalene	PAOs	Adipic acid Esters	Polyhydric alcohols Esters
						Kinematic viscosity at 100 ℃ in mm2/s	4.7	12.4	5.8	5.3	4.3
Rotary oxygen bomb experiments (150 ℃,621kPa, water, copper)/min	195	180	17	70	-
						Differential scanning calorimetry (180 ℃,3.45MPa) min	60+	60+	2.5	5.0	60+
Total acid number after oxidation corrosion test (as potassium hydroxide) Meter)/(mg. g-1)	0.092	0.089	-	7.1	1.3

TABLE 2 comparison of aniline points for different base oils

Item	Low viscosity alkylnaphthalenes	High viscosity alkylnaphthalenes	PAOs	Synthesis of esters	Alkyl benzene	Group I base oils
							Kinematic viscosity at 100 ℃ in mm2/s	4.7	12.4	5.5	5.2	4.2	4.0
Aniline point, deg.C	32	90	119	20	77.8	100

TABLE 3 comparison of hydrolytic stability of different base oils

Item	Low viscosity alkylnaphthalenes	High viscosity alkylnaphthalenes	Adipic acid ester	Polyol esters
					Kinematic viscosity at 100 ℃ in mm2/s	4.7	12.4	5.3	4.3
The total acid value after hydrolysis is increased by mg/g (calculated by potassium hydroxide)	0.02	0.02	0.16	0.20

The naphthalene ring structure rich in electrons of the alkyl naphthalene base oil and the saturated alkane structure of the natural gas synthetic oil form association, and the naphthalene ring structure and the saturated alkane structure are cooperated with each other to form the following structure, so that the oxidation resistance characteristic of high saturation of the natural gas synthetic oil can be exerted, and the strong polarity and the water resistance of alkyl naphthalene can be achieved.

Wherein n is 10 to 25.

The natural gas synthetic oil and the alkyl naphthalene base oil are used as the base oil combination, so that the natural gas synthetic oil and the alkyl naphthalene base oil have excellent oxidation resistance and hydrolysis resistance, and can provide stronger water resistance and longer service life for a vacuum pump running under a humid working condition; excellent cleaning performance and wear-resistant and rust-proof performance, and can protect the pump body in all aspects; excellent additive sensitivity and improved system stability.

Preferably, the hydrophobic agent is a large molecular weight polyisobutylene, the polyisobutylene is PB2400, and the average molecular weight of PB2400 is 2450. The PB2400 has excellent hydrophobic property, and remarkably improves the anti-demulsification capability and hydrolysis resistance of oil products.

Preferably, the oiliness agent comprises one or more of polyester and fatty acid ester. The addition of the oiliness agent can improve the sensitivity and balance of the additive of the oil product and increase the synergistic effect of different base oils, different additives and the base oils and the additives.

Preferably, the antioxidant comprisesOne or more of macromolecular phenol and alkylated diphenylamine, wherein the molecular weight of the macromolecular phenol is 900-1100, and the number of alkyl C atoms in the alkylated diphenylamine is C₄～C₈. The addition of the antioxidant can improve the oxidation resistance of oil products, reduce harmful deposits of oil sludge, paint films and the like, inhibit the increase of viscosity and prolong the service life.

Preferably, the extreme pressure antiwear agent is a low-volatility phosphate ester type agent, and the low-volatility phosphate ester type agent comprises one or more of butyl triphenyl thiophosphate, nonylated triphenyl thiophosphate, tri (di-tert-butylphenyl) phosphite and triphenyl phosphite. The addition of the extreme pressure antiwear agent can reduce equipment wear, improve the extreme pressure resistance and the antiwear capacity of an oil product covered by a low oil film, and reduce equipment friction damage.

Preferably, the corrosion inhibitor is benzotriazole and derivatives thereof. The addition of corrosion inhibitors can protect non-ferrous metals, including copper, aluminum, and alloys thereof, within the equipment from chemical or electrochemical metal corrosion.

Preferably, the antirust agent is organic amine or a nitrogen-containing heterocyclic compound. The addition of the antirust agent can form a compact protective film on the surface of the metal to prevent the equipment from being rusted.

Preferably, the free water scavenger is a nonionic surfactant having an HLB value of less than 10, and the nonionic surfactant is a polyoxyethylene ether-based surfactant having a molecular weight of more than 500.

Preferably, the demulsifier is an oil-soluble nonionic surfactant which is a polymer of ethylene oxide and propylene oxide with the molecular weight of 1500-10000.

Preferably, the defoaming agent is a silicone defoaming agent, and the silicone defoaming agent is a macromolecular siloxane defoaming agent.

The application also discloses a preparation method of the synthetic water-resistant long-life vacuum pump oil, which comprises the following steps:

s1: adding 45-55 wt% of natural gas synthetic oil and 45-55 wt% of alkyl naphthalene base oil into a blending kettle for stirring, wherein the stirring temperature is 48-52 ℃, and the stirring speed is 90-110 r/min;

s2: sequentially adding a hydrophobic agent, an oiliness agent, an antioxidant, an extreme pressure antiwear agent, a corrosion inhibitor, an antirust agent, a free water capture agent and the remaining natural gas synthetic oil and alkyl naphthalene base oil, and continuously stirring for 1-2 hours;

s3: and sequentially adding a demulsifier and a defoaming agent, stopping heating, continuously stirring and cooling to room temperature to obtain the synthetic water-resistant long-life vacuum pump oil.

This application can bring following beneficial effect:

the synthetic water-resistant long-life vacuum pump oil has the following effective benefits: the synthetic water-resistant long-life vacuum pump oil prepared by using the combination of natural gas synthetic oil and alkyl naphthalene base oil as base oil has reasonable components, good additive sensitivity and stable performance; the water-resistant vacuum pump has extremely strong water resistance, is emulsification resistant and hydrolysis resistant, and is suitable for a vacuum pump working in a humid environment; the paint has excellent high-temperature oxidation resistance, effectively inhibits the generation of harmful sediments such as oil sludge, paint films, colloid and the like, and keeps the cleanness of equipment; outstanding rust-resistant, wear-resisting, corrosion protection performance, the pump body can be protected to the full aspect, the life of extension vacuum pump.

Detailed Description