CN-122012163-A - Phosphate-based fire-resistant oil composition and preparation method and application thereof

Abstract

The invention discloses a phosphate-based fire-resistant oil composition, a preparation method and application thereof, and belongs to the technical field of fire-resistant oil compositions, wherein the composition comprises, by mass, 70-85 parts of triaryl phosphate, 10-20 parts of polyol phosphate, 0.5-2.0 parts of organic amine primary antioxidants, 0.3-1.5 parts of hindered phenol auxiliary antioxidants, 0.1-0.8 part of benzotriazole derivatives, 0.05-0.3 part of polysiloxane surfactants and 0.01-0.1 part of nano titanium dioxide. The invention has excellent comprehensive performance, particularly has outstanding advantages in high-temperature stability, oxidation resistance service life and material protection, and can effectively reduce equipment maintenance cost and prolong equipment overhaul period.

Inventors

• FU LONGFEI
• WANG YU
• YAN TAO
• WANG LUN
• SONG QINGYUAN
• WANG JUAN
• WANG XIAOWEI
• TANG JINWEI
• GAO ZHANYANG
• XIE JIALIN
• ZHANG JINWEI
• FENG LIPING

Assignees

• 西安热工研究院有限公司

Dates

Publication Date

20260512

Application Date

20260121

Claims (10)

1. 1. The phosphate-based fire-resistant oil composition is characterized by comprising, by mass, 70-85 parts of triaryl phosphate, 10-20 parts of polyol phosphate, 0.5-2.0 parts of organic amine primary antioxidants, 0.3-1.5 parts of hindered phenol secondary antioxidants, 0.1-0.8 part of benzotriazole derivatives, 0.05-0.3 part of polysiloxane surfactants and 0.01-0.1 part of nano titanium dioxide.
2. 2. A phosphate-based fire resistant oil composition according to claim 1, wherein the triaryl phosphate is tolyldiphenyl phosphate.
3. 3. A phosphate-based fire resistant oil composition according to claim 1, wherein the polyol phosphate is pentaerythritol phosphate or trimethylolpropane phosphate.
4. 4. The phosphate-based fire-resistant oil composition according to claim 1, wherein the organic amine primary antioxidant is dinonyl diphenylamine, the hindered phenol secondary antioxidant is beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) stearyl propionate, and the benzotriazole derivative is tolyltriazole.
5. 5. The phosphate-based fire resistant oil composition according to claim 1, wherein the benzotriazole derivative is tolyltriazole and the polysiloxane surfactant is polyether modified silicone oil.
6. 6. A method of preparing the phosphate-based fire resistant oil composition of any one of claims 1 to 5, comprising the steps of: heating triaryl phosphate and polyol phosphate to a preset temperature under the protection of inert gas, and stirring to obtain a mixture a; Adding an organic amine primary antioxidant and a hindered phenol secondary antioxidant diluted by ethanol into the mixture, and reacting at constant temperature to obtain a mixture b; adding benzotriazole derivatives, polysiloxane surfactant and nano titanium dioxide into the mixture b in sequence, and continuously stirring to obtain a mixed product; And filtering and vacuum devolatilizing the mixed product to obtain the phosphate-based fire-resistant oil composition.
7. 7. The method for preparing a phosphate-based fire resistant oil composition according to claim 6, wherein the preset temperature is 80 ℃ to 90 ℃, and the inert gas is nitrogen.
8. 8. The preparation method of the phosphate-based fire resistant oil composition according to claim 6, wherein the total concentration of the organic amine primary antioxidant and the hindered phenol secondary antioxidant in ethanol is 3-8wt%, and the constant temperature reaction temperature is 80-90 ℃ for 1-2 hours.
9. 9. The method for preparing the phosphate-based fire resistant oil composition according to claim 6, wherein the filtering process is performed by using a filter element with a thickness of 0.5-10 μm, and the vacuum devolatilization is performed under the condition that the residual pressure is lower than 0.1 kPa.
10. 10. Use of the phosphate-based fire-resistant oil composition according to any one of claims 1 to 5 as lubricating oil in electrical equipment.

Description

Phosphate-based fire-resistant oil composition and preparation method and application thereof Technical Field The invention belongs to the technical field of fire-resistant oil compositions, and relates to a phosphate-based fire-resistant oil composition, a preparation method and application thereof. Background In the power industry, especially in large-scale thermal generator sets, a steam turbine adjusting control system is a core part for guaranteeing safe and stable operation of the set. Since such systems are typically operated in high temperature, high pressure and hazardous environments with potential ignition sources, the working medium must have excellent fire safety. Therefore, fire resistant oils based on synthetic esters of phosphoric acid esters are widely used. The synthetic ester has natural flame retardant property, can obviously reduce fire hazard risk, and becomes an irreplaceable functional liquid in an EH (electrohydraulic adjustment) system of a modern high-parameter turbine. The fire-resistant oil needs to meet various strict energy requirements in practical application, namely, the fire-resistant oil must have extremely high flash point and self-extinguishing property, usually requires the flash point to be higher than 240 ℃ and extremely short self-extinguishing time, so that the fire-resistant oil cannot become an ignition source under the condition of high temperature or unexpected leakage, and the fire safety of a power station is fundamentally ensured. In addition, because some parts of the steam turbine regulating system (such as an actuating mechanism close to a main valve) are in a high-temperature environment for a long time, oil liquid needs to have excellent thermal stability and oxidation stability, can resist thermal degradation and oxidative deterioration under long-term high-temperature operation, and avoids abnormal viscosity rise or sludge deposition caused by oil aging to block the precise servo valve. Thirdly, in view of the unavoidable nature of water vapor in the operating environment of the power station, the oil liquid needs to have excellent hydrolytic stability and anti-emulsifying property, can rapidly separate and remove the invaded water, and prevent the generation of corrosive acidic substances due to the hydrolysis of esters caused by the retention of the water, thereby causing corrosion in the system, degradation of the metal surface and reduction of the electrical insulation property of the oil product. In addition, good material compatibility is also of critical importance, especially for rubber sealing elements (such as fluororubber and nitrile rubber) made of various materials in the system, excessive swelling or shrinkage should not be generated, and meanwhile corrosion to nonferrous metal parts such as copper, silver and the like needs to be strictly controlled so as to ensure the reliability of long-term sealing and the integrity of elements of the whole hydraulic system. However, the phosphate fire resistant oil products of the prior art still have a number of significant drawbacks under practical conditions. Firstly, under the long-term high-temperature running condition, partial phosphate molecular chains are broken, and small molecular acid phosphate and phosphoric acid are generated by decomposition, so that the acid value of oil is rapidly increased, the electrochemical corrosion to metal parts (such as bearings and bearing bushes) is accelerated, and the hydrolysis reaction of the oil is further catalyzed, so that vicious circle is formed. Secondly, the antioxidant system of the traditional anti-fuel oil mostly depends on a single type of antioxidant (such as amine or phenols), the antioxidant mechanism and the effective action stage are limited, the antioxidant system consumes too fast under complex alternate oxidation stress, the whole oxidation induction period of the oil product is short, and the service life of the antioxidant system is difficult to meet the requirements of a supercritical unit and a ultra-supercritical unit on prolonging the repair period. In addition, the viscosity of part of triaryl phosphate ester fire-resistant oil is obviously increased under a low-temperature environment, even the freezing tendency occurs, so that the unit has poor oil fluidity, difficult pumping and delayed response when in cold starting, and the control precision and the starting reliability of the regulating system are directly affected. Therefore, the novel high-performance phosphate-based fire-resistant oil composition is developed, the thermal stability, oxidation stability, hydrolytic stability and wide-temperature-range performance of the composition are improved, the service life of oil products is fundamentally prolonged, the operation safety of equipment is ensured, and the composition has great significance in promoting the technical progress of the power industry. Disclosure of Invention The invention aims to provide a phosphate-bas