阅读说明：本技术 一种离心式压缩机油及其制备方法 (Centrifugal compressor 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：本申请提出了一种离心式压缩机油及其制备方法,其中,一种离心式压缩机油,包括如下重量份数的原料：80～100份的基础油和0.01～16份的添加剂,所述基础油包括18～70份的天然气合成油、20～70份的烷基萘基础油。本申请中的离心式压缩机油组分合理,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,能够有效解决油品的乳化问题；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；极压抗磨能力好,防锈防腐蚀能力强,用油损耗少,换油周期长,经济性好,满足了离心式压缩机超长使用寿命的要求。(The application provides centrifugal compressor oil and a preparation method thereof, wherein the centrifugal compressor oil comprises the following raw materials in parts by weight: 80-100 parts of base oil and 0.01-16 parts of additive, wherein the base oil comprises 18-70 parts of natural gas synthetic oil and 20-70 parts of alkyl naphthalene base oil. The centrifugal compressor oil has reasonable components, good additive sensitivity and stable performance; the emulsion has strong water resistance, is resistant to emulsification and hydrolysis, and can effectively solve the emulsification problem of oil products; 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 extreme pressure wear resistance is good, the antirust and anticorrosion capabilities are strong, the oil consumption is less, the oil change period is long, the economical efficiency is good, and the requirement of the ultra-long service life of the centrifugal compressor is met.)

1. The centrifugal compressor oil is characterized by comprising the following raw materials in parts by weight: 80-100 parts of base oil and 0.01-16 parts of additive, wherein the base oil comprises 18-70 parts of natural gas synthetic oil and 20-70 parts of alkyl naphthalene base oil.

2. A centrifugal compressor oil according to claim 1, characterized in that: the additive comprises, by weight, 1-3 parts of a hydrophobing agent, 4-10 parts of a high-temperature antioxidant, 0.1-1.5 parts of an extreme pressure antiwear agent, 0.01-0.1 part of a corrosion inhibitor, 0.01-0.5 part of an antirust agent, 0.01-0.05 part of a demulsifier and 0.01-0.05 part of a defoaming agent.

3. A centrifugal compressor oil according to claim 2, characterized in that: the hydrophobing agent is polyisobutylene, which is PB2400 with an average molecular weight of 2450.

4. A centrifugal compressor oil according to claim 2, characterized in that: the high-temperature antioxidant comprises one or more of macromolecular phenol, alkylated diphenylamine and naphthylamine.

5. A centrifugal compressor oil according to claim 4, characterized in that: the molecular weight of the macromolecular phenol is 900-1100, and the alkyl C-atom number in the alkylated diphenylamine is C₄～C₈The naphthylamine is N-phenyl- α -naphthylamine or N-phenyl- β -naphthylamine.

6. A centrifugal compressor oil according to claim 2, characterized in that: the extreme pressure antiwear agent is a phosphate type antiwear agent, and the phosphate type antiwear agent comprises one or more of phenyl phosphite ester and phenyl thiophosphate ester.

7. A centrifugal compressor oil according to claim 2, characterized in that: the corrosion inhibitor comprises one or more of benzotriazole and derivatives thereof, thiadiazole and derivatives thereof, and the antirust agent is organic acid, organic amine or nitrogen-containing heterocyclic compound.

8. A centrifugal compressor oil according to claim 2, characterized in that: the demulsifier is an oil-soluble nonionic surfactant, the oil-soluble nonionic surfactant is a polymer of ethylene oxide and propylene oxide, and the molecular weight of the polymer is 1500-10000.

9. A centrifugal compressor oil according to claim 2, characterized in that: the defoaming agent is a silicone defoaming agent, the silicone defoaming agent is a siloxane defoaming agent, and the viscosity of the siloxane defoaming agent is 50-350 cst.

10. A method of making a centrifugal compressor oil according to claim 2, 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, a high-temperature antioxidant, an extreme pressure antiwear agent, a corrosion inhibitor, an antirust agent and the rest of the natural gas synthetic oil and the 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 centrifugal compressor oil.

Technical Field

The application belongs to the field of air compressor lubrication and cooling, and particularly relates to centrifugal compressor oil and a preparation method thereof.

Background

The compressor plays an extremely important role in industrial production life as a leading soldier in equipment manufacturing industry. A centrifugal compressor is a vane rotary compressor in which a centrifugal force action given to gas by an impeller rotating at a high speed and a diffuser action given to gas in a diffuser passage increase the gas pressure. The centrifugal air compressor has the obvious advantages of large air flow, high operation rate, few friction pieces and the like, and is widely applied to the industries of large-scale chemical industry, oil refining, refrigeration and the like.

Turbine oil is mostly adopted as a lubricating medium in the lubricating industry of the centrifugal air compressor. The turbine oil has good antioxidant and antirust functions, but is deficient in the aspects of emulsification resistance, detergency, service life and the like. The centrifugal air compressor machine operating temperature is low, and the moisture that brings in the air tastes to evaporate smoothly and gets rid of, and long-term accumulation just can form the gathering of moisture, not only can cause the emulsification of oil, still can play the acceleration action to the oxidative deterioration of oil. In addition, acidic substances and oxidation deposits generated by gradual oxidation and aging of the engine oil in the long-term use process can also have adverse effects on centrifuge components. Therefore, the conventional turbine oil cannot meet the long-term lubrication requirement of the centrifugal air compressor.

Currently, products such as PAO (poly alpha olefin), PAG (polyether) and the like are mainly used as special long-life centrifugal compressor oil in the market, and for example, patent document CN106433936A discloses a long-life oil injection rotary air compressor oil composition which can meet the requirement of a long oil change period of a centrifugal air compressor, but has the problems of high cost, poor economy and the like, and a lot of users cannot accept the high oil change cost.

Disclosure of Invention

In order to solve the problems, the application provides a centrifugal compressor oil and a preparation method thereof, wherein the centrifugal compressor oil comprises the following raw materials in parts by weight: 80-100 parts of base oil and 0.01-16 parts of additive, wherein the base oil comprises 18-70 parts of natural gas synthetic oil and 20-70 parts of alkyl naphthalene base oil.

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, from the data in table 3, we obtain: different from ester base oil, the molecular structure of alkyl naphthalene has no easily hydrolyzed group, and the hydrolytic stability is better.

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

Item	Low viscosity alkylnaphthalenes	High viscosity alkylnaphthalenes	PAOs	Adipic acid ester	Polyol esters
						Kinematic viscosity at 100 ℃ in mm2/s	4.7	12.4	5.8	5.3	4.3
Rotating oxygen bomb test (150 ℃,621kPa, water, copper)/min	195	180	17	70	-
						Differential scanning thermal analysis (180 ℃,3.45MPa)/min	60+	60+	2.5	5.0	60+
Total acid value (in terms of potassium hydroxide)/(mg g) after oxidative corrosion test-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 electron-rich naphthalene ring structure of the alkyl naphthalene base oil and the saturated alkane structure of the natural gas synthetic oil form association, and the two structures cooperate with each other to form the following structure, so that the highly saturated oxidation resistance characteristic of the natural gas synthetic oil can be exerted, and the strong polarity of alkyl naphthalene can be achieved.

Wherein n is 10 to 25.

The natural gas synthetic oil and the alkyl naphthalene base oil are combined as the base oil, so that the oil has excellent oxidation resistance and hydrolysis resistance, and can provide an ultra-long service life for the centrifugal compressor oil; excellent cleaning performance and wear-resistant and rust-proof performance, and can protect the screw head in all aspects; excellent additive sensitivity and improved system stability.

Preferably, the additive comprises, by weight, 1-3 parts of a hydrophobing agent, 4-10 parts of a high-temperature antioxidant, 0.1-1.5 parts of an extreme pressure antiwear agent, 0.01-0.1 part of a corrosion inhibitor, 0.01-0.5 part of an antirust agent, 0.01-0.05 part of a demulsifier and 0.01-0.05 part of an antifoaming agent.

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

Preferably, the high-temperature antioxidant comprises one or more of macromolecular phenol, alkylated diphenylamine and naphthylamine; preferably, the molecular weight of the macromolecular phenol is 900-1100, and the number of alkyl C atoms in the alkylated diphenylamine is C₄～C₈The high-temperature antioxidant in the application has the functions of improving the oxidation resistance of oil products, reducing harmful deposits of oil sludge, paint films and the like, inhibiting viscosity increase and prolonging the service life.

Preferably, the extreme pressure antiwear agent is a phosphate type antiwear agent, and the phosphate type antiwear agent comprises one or more of phenyl phosphite and phenyl thiophosphate. The extreme pressure antiwear agent has the functions of reducing equipment wear, improving the extreme pressure resistance and the antiwear capacity of an oil product covered by a low oil film and reducing equipment friction damage.

Preferably, the corrosion inhibitor comprises one or more of benzotriazole and derivatives thereof, thiadiazole and derivatives thereof, and the antirust agent is an organic acid, organic amine or a nitrogen-containing heterocyclic compound. The corrosion inhibitor is used for protecting nonferrous metals including copper, aluminum and alloys thereof in equipment and reducing chemical or electrochemical metal corrosion. The antirust agent has the function of forming a compact protective film on the surface of metal to prevent equipment from being rusted.

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

Preferably, the defoaming agent is a silicone defoaming agent, the silicone defoaming agent is a siloxane defoaming agent, and the viscosity of the siloxane defoaming agent is preferably 50-350 cst.

In addition, the application also discloses a preparation method of the centrifugal compressor 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, a high-temperature antioxidant, an extreme pressure antiwear agent, a corrosion inhibitor, an antirust agent and the rest of the natural gas synthetic oil and the 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 centrifugal compressor oil.

This application can bring following beneficial effect:

the invention provides a centrifugal compressor oil with the service life exceeding 20000 hours. Has the following advantages: the components are reasonable, the sensitivity of the additive is good, and the performance is stable; the emulsion has strong water resistance, is resistant to emulsification and hydrolysis, and can effectively solve the emulsification problem of oil products; 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 extreme pressure wear resistance is good, the antirust and anticorrosion capabilities are strong, the oil consumption is less, the oil change period is long, the economical efficiency is good, and the requirement of the ultra-long service life of the centrifugal compressor is met.

Detailed Description

The preparation method of the centrifugal compressor oil in the following embodiment comprises the following steps:

adding 45-55 wt% of natural gas synthetic oil and alkyl naphthalene base oil into a blending kettle, starting stirring at 50 +/-2 ℃ and at a stirring speed of 100 +/-10 r/min. Keeping the temperature and the stirring speed, sequentially adding a hydrophobic agent, a high-temperature antioxidant, an extreme pressure antiwear agent, a corrosion inhibitor, an antirust agent and the rest natural gas synthetic oil and alkyl naphthalene base oil, continuously keeping the stirring temperature of 50 +/-2 ℃ and the stirring speed of 100 +/-10 r/min, and stirring and blending for 1-2 hours. Then adding a demulsifier and a defoaming agent in sequence. The heating was turned off and the mixture was cooled to room temperature with stirring. The stirring time of the whole blending process is not less than 3 hours. Thus obtaining the centrifugal compressor oil of the invention. After blending, filtering for 2-3 times by using a filtering system with the filtering precision not more than 5 mu m, and filling the mixture into a finished product.

The specific implementation conditions are as follows: