Lubricating and cooling medium special for hydraulic retarding device and preparation method of lubricating and cooling medium

Abstract

The invention discloses a special lubricating and cooling medium for a hydrodynamic retarder, which comprises the following components: a base oil composition comprising poly alpha olefin, trimethylolpropane triheptyl ester, dioctyl malate, cardanol polyoxyethylene ether oleate (CPOA) and oil soluble polyether (OSP); and an additive composition comprising polymethyl methacrylate (PMMA), a detergent, an ashless dispersant, an anti-wear agent, an antioxidant, and an antifoaming agent. The biodegradable synthetic ester oil and the environment-friendly additive are compounded, so that the lubricating and cooling medium has excellent wide temperature range performance and low-temperature fluidity, and reliable operation under the severe cold working condition is guaranteed; the lubricating oil has good lubricating and anti-wear characteristics to reduce frictional wear, has excellent thermal oxidation stability and cleaning and dispersing capacity to inhibit generation of sediments, and keeps a system clean and stable in braking; meanwhile, the formula has good sealing adaptability and biodegradability, the comprehensive performance of the device is comprehensively improved, the service life of the device is comprehensively prolonged, and meanwhile the energy-saving and environment-friendly requirements are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lubricating medium, in particular to a special lubricating and cooling medium for hydraulic retarder and a preparation method thereof. BACKGROUND

[0002] As an indispensable auxiliary braking device for heavy commercial vehicles, the hydraulic retarder converts the kinetic energy of the vehicle into heat energy through liquid resistance, significantly improving the driving safety and service life of the main braking system under long downhill working conditions. The core working principle determines that the internal lubricating and cooling medium not only needs to bear the transmission lubrication function, but also is the key working medium for torque transmission and heat dissipation. Therefore, the performance of the medium is directly related to the working efficiency, reliability and service life of the retarder. However, the traditional mineral oil-based lubricating and cooling medium gradually shows its shortcomings when dealing with increasingly harsh working conditions. Its inherent poor viscosity-temperature characteristics, poor low-temperature fluidity, weak thermal oxidation stability and other defects easily lead to difficulties in starting in cold environments, rapid oxidation of oil under high temperature conditions, deposition and blockage of flow channels by oil sludge and carbon deposits, and further cause braking efficiency decay, noise increase and even equipment failure.

[0003] With the increasingly stringent environmental regulations and the promotion of the "double carbon" target, the environmental impact of the vehicle throughout its life cycle is attracting attention. The traditional lubricating medium has poor biodegradability, and if it leaks or is improperly disposed of during use and replacement, it will cause long-term pollution to the ecological environment. At the same time, some synthetic or semi-synthetic oil products in the prior art that attempt to improve performance, although they have improved in single performance such as low temperature or high temperature performance, often fail to achieve a balance in comprehensive performance, especially in ultra-low temperature starting, long-term detergency and dispersion, material compatibility and environmental friendliness, and cannot meet the standards in multiple key indicators at the same time, resulting in a "performance seesaw" effect. In addition, the synergy and antagonism between different base oils and additive components are complex, and if the compatibility is poor, not only can the performance gain not be achieved, but the oil product may be accelerated to age or cause corrosion and swelling damage to the sealing elements and metal parts inside the retarder.

[0004] Therefore, there is a need in the art for a special lubricating and cooling medium that can comprehensively consider ultra-low temperature working conditions, efficient lubrication and cooling, excellent long-term performance and good biodegradability, in order to solve the technical bottlenecks in the prior art such as insufficient lubricating performance, poor environmental compatibility, poor adaptability to sealing materials and difficult to meet the requirements of long oil change cycle in terms of comprehensive durability. SUMMARY

[0005] In view of the above technical problems in the related art, the present application provides a special lubricating and cooling medium for hydraulic retarder and a preparation method thereof, which can overcome the above shortcomings of the prior art.

[0006] To achieve the above technical purposes, the technical solution of the present application is as follows: A lubricating cooling medium special for hydraulic retarder; The lubricating cooling medium special for hydraulic retarder comprises the following components: A base oil composition comprising polyalphaolefin, triheptyl trimellitate, dioctyl malate, cardanol polyoxyethylene ether oleate (CPOA) and oil-soluble polyether (OSP); And an additive composition comprising polymethyl methacrylate (PMMA), detergent, ashless dispersant, anti-wear agent, antioxidant and defoaming agent.

[0007] Further, the detergent is polyethylene glycol adipate sulfonate, the ashless dispersant is boric acid modified succinimide, the anti-wear agent comprises triphenyl phosphorothionite and acidic phosphate ammonium salt, the antioxidant is isooctyl 3,5-di-tert-butyl-4-hydroxybenzene propionate, and the defoaming agent is polyether and fatty acid ester composite defoaming agent.

[0008] Further, the base oil composition comprises, in parts by weight: Polyalphaolefin 30-40 parts, triheptyl trimellitate 40-50 parts, dioctyl malate 2-8 parts, cardanol polyoxyethylene ether oleate (CPOA) 2-5 parts, and oil-soluble polyether (OSP) 5-10 parts.

[0009] Further, the additive composition comprises, in parts by weight, relative to the base oil composition 90-100 parts: Polymethyl methacrylate (PMMA) 3-5 parts, polyethylene glycol adipate sulfonate 3-4 parts, boric acid modified succinimide 2-3 parts, triphenyl phosphorothionite 1-2 parts, acidic phosphate ammonium salt 1-2 parts, isooctyl 3,5-di-tert-butyl-4-hydroxybenzene propionate 2-3 parts, and polyether and fatty acid ester composite defoaming agent 0.01-0.02 parts.

[0010] According to another aspect of the present application, a method for preparing a lubricating cooling medium special for hydraulic retarder is provided; The method for preparing the lubricating cooling medium special for hydraulic retarder comprises the following steps: Step one: preparation of mixed base oil: polyalphaolefin, triheptyl trimellitate, dioctyl malate, cardanol polyoxyethylene ether oleate (CPOA) and oil-soluble polyether (OSP) are mixed, and stirring is performed under heating to obtain the mixed base oil; Step two: preparation of lubricating cooling medium: polymethyl methacrylate (PMMA) is added to the mixed base oil, and after stirring and cooling, a detergent, an ashless dispersant, an anti-wear agent, an antioxidant and a defoaming agent are sequentially added, and after continuous stirring and filtration, the lubricating cooling medium is obtained.

[0011] Further, the heating temperature in step one is 60-65 DEG C, and the stirring time is 30 minutes. In step two, the temperature is lowered to 45-50 DEG C, the stirring time after adding the additive is 30 minutes, and the filtration is performed at normal temperature using a 5-micron filter membrane.

[0012] Further, the temperature is lowered to 45-50 DEG C in step two, the stirring time after adding the additive is 30 minutes, and the filtration is performed at normal temperature using a 5-micron filter membrane.

[0013] Further, in step one, the poly-alpha olefin is 30-40 parts by weight, the trihydroxymethylpropane triheptyl ester is 40-50 parts by weight, the dioctyl malate is 2-8 parts by weight, the cardanol polyoxyethylene ether oleic acid ester (CPOA) is 2-5 parts by weight, and the oil-soluble polyether (OSP) is 5-10 parts by weight.

[0014] Further, in step two, the mixed base oil is 90-100 parts by weight, the added polymethyl methacrylate (PMMA) is 3-5 parts by weight, the polyethylene glycol adipate sulfonate is 3-4 parts by weight, the boric acid modified succinimide is 2-3 parts by weight, the triphenyl thiophosphate is 1-2 parts by weight, the acidic phosphate ammonium salt is 1-2 parts by weight, the 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid isooctyl ester is 2-3 parts by weight, and the polyether and fatty acid ester composite defoaming agent is 0.01-0.02 parts by weight.

[0015] Further, in step two, the detergent is the polyethylene glycol adipate sulfonate, the ashless dispersant is the boric acid modified succinimide, the anti-wear agent includes the triphenyl thiophosphate and the acidic phosphate ammonium salt, the antioxidant is the 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid isooctyl ester, and the defoaming agent is the polyether and fatty acid ester composite defoaming agent.

[0016] The present application has the following beneficial effects: by using the biodegradable synthetic ester oil and the scientific compounding of the environmental protection additives, the obtained medium has excellent wide temperature range performance and low temperature fluidity, ensures the starting and running reliability under harsh working conditions such as severe cold, effectively reduces the friction and wear by the good lubricating and anti-wear properties, and maintains the system clean and the braking efficiency stable by the excellent thermal oxidation stability and the cleaning and dispersing capacity, and at the same time, the formula has good sealing material adaptability and biodegradable properties, improves the comprehensive performance and service life of the hydraulic retarder, and meets the energy saving and environmental protection requirements. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0018] The special lubricating and cooling medium for a hydraulic retarder and the preparation method thereof according to the embodiments of the present application take poly-alpha olefin, triheptyl trimethylolpropane ester, dioctyl malate, cardanol polyoxyethylene ether oleate (CPOA) and oil-soluble polyether (OSP) as base raw materials, add polymethyl methacrylate PMMA, polyethylene glycol adipate sulfonate, boric acid modified succinimide, triphenyl phosphorothioate, acidic phosphate ammonium salt, 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid isooctyl ester and polyether + fatty acid ester composite defoaming agent under certain temperature conditions to prepare an environmentally-friendly super-low-temperature special lubricating and cooling medium for a hydraulic retarder.

[0019] Specifically, the method comprises the following steps: Step 1: preparation of mixed base oil; The poly-alpha olefin, triheptyl trimethylolpropane ester, dioctyl malate, cardanol polyoxyethylene ether oleate (CPOA) and oil-soluble polyether (OSP) are sequentially placed in a blending kettle, heated to 60-65℃, and stirred for 30 minutes to obtain the mixed base oil.

[0020] Step 2: preparation of the environmentally-friendly super-low-temperature special lubricating and cooling medium for a hydraulic retarder; The polymethyl methacrylate PMMA is added to the mixed base oil, stirring is maintained for 30 minutes, and the temperature is lowered to 45-50℃; then the polyethylene glycol adipate sulfonate, boric acid modified succinimide, triphenyl phosphorothioate, acidic phosphate ammonium salt, 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid isooctyl ester and polyether + fatty acid ester composite defoaming agent are sequentially added, stirring is maintained for 30 minutes, and normal temperature filtration (5 μm) is performed to obtain the synthetic environmentally-friendly super-low-temperature special lubricating and cooling medium for a hydraulic retarder.

[0021] In step 1, the poly-alpha olefin is 30-40 parts, the triheptyl trimethylolpropane ester is 40-50 parts, the dioctyl malate is 2-8 parts, the cardanol polyoxyethylene ether oleate CPOA is 2-5 parts, and the oil-soluble polyether (OSP) is 5-10 parts.

[0022] The step 2 mixes base oil 90-100 parts, polymethyl methacrylate PMMA 3-5 parts, polyethylene glycol adipate sulfonate 3-4 parts, boric acid modified succinimide 2-3 parts, triphenyl phosphorothioate 1-2 parts, acidic phosphate ammonium salt 1-2 parts, 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid isooctyl ester 2-3 parts, polyether + fatty acid ester composite defoaming agent 0.01-0.02 parts.

[0023] Preferably, the polyalphaolefin 35-40 parts, trihydroxymethylpropane triheptyl ester 40-50 parts, dioctyl malate 3-8 parts, cardanol polyoxyethylene ether oleic acid ester (CPOA) 3-5 parts, oil-soluble polyether (OSP) 5-7 parts, polymethyl methacrylate PMMA 3-4 parts, polyethylene glycol adipate sulfonate 3-4 parts, boric acid modified succinimide 2-3 parts, triphenyl phosphorothioate 1-2 parts, acidic phosphate ammonium salt 1-2 parts, 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid isooctyl ester 2-3 parts, polyether + fatty acid ester composite defoaming agent 0.01-0.02 parts.

[0024] The above-mentioned preparation method prepares the environmentally friendly super-low-temperature hydraulic retarder special lubricating cooling medium.

[0025] The beneficial effect is that the low-temperature pour point of the hydraulic retarder special lubricating cooling medium product can reach minus 50°C, ensuring the normal start-up operation of the retarder in cold regions; the mixed base oil after compounding changes the shortcomings of single components, can play the advantages of different component base oils, and makes the overall performance achieve the most ideal effect and requirement, and the compounding combination of the selected additives can effectively inhibit the generation of oil sludge deposits, maintain clean and smooth use conditions for a long time, ensure the continuous operation of the retarder under high and low temperature environmental conditions, and the service performance reaches the long service life level, and the oil change period can be up to 200,000 kilometers; the scientific and reasonable matching of the base oil components ensures the adaptability and durability of the sealing material, and the equipment does not leak.

[0026] The application will be further described in detail in combination with specific embodiments: Example 1 Preparation of mixed base oil: Put polyalphaolefin 30.0 g, trihydroxymethylpropane triheptyl ester 40.0 g, dioctyl malate 3.0 g, cardanol polyoxyethylene ether oleic acid ester (CPOA) 3.0 g, and oil-soluble polyether (OSP) 5.0 g into a blending kettle in sequence, heat to 60-65°C, and stir for 30 minutes to obtain the mixed base oil.

[0027] 2. Preparation of environmentally friendly super-low-temperature hydraulic retarder special lubricating cooling medium: Poly methyl methacrylate PMMA 3.0 grams is added to the mixed base oil, stirring is maintained for 30 minutes, and the temperature is lowered to 45-50°C; then polyethylene glycol adipate sulfonate 3.0 grams, boric acid modified succinimide 2.0 grams, triphenyl phosphorothioate 0.1 gram, acidic phosphate ammonium salt 0.1 gram, 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid isooctyl ester 2.0 grams, polyether + fatty acid ester composite defoaming agent 0.01 gram are sequentially added, stirring is maintained for 30 minutes, and the product is filtered at room temperature (5 μm) to obtain the environmentally friendly super-low temperature hydraulic retarder special lubricating cooling medium.

[0028] Detection of various indicators of the product: Example 2: 1. Preparation of mixed base oil: Polyalphaolefin 35.0 grams, trihydroxymethylpropane triheptyl ester 45.0 grams, dioctyl malate 5.0 grams, cardanol polyoxyethylene ether oleic acid ester (CPOA) 4.0 grams, and oil-soluble polyether (OSP) 7.0 grams are sequentially placed in a blending kettle, heated to 60-65°C, and stirred for 30 minutes to obtain the mixed base oil.

[0029] 2. Preparation of environmentally friendly super-low temperature hydraulic retarder special lubricating cooling medium: Poly methyl methacrylate PMMA 3.5 grams is added to the mixed base oil, stirring is maintained for 30 minutes, and the temperature is lowered to 45-50°C; then polyethylene glycol adipate sulfonate 3.5 grams, boric acid modified succinimide 2.5 grams, triphenyl phosphorothioate 0.2 gram, acidic phosphate ammonium salt 0.1 gram, 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid isooctyl ester 2.5 grams, polyether + fatty acid ester composite defoaming agent 0.01 gram are sequentially added, stirring is maintained for 30 minutes, and the product is filtered at room temperature (5 μm) to obtain the environmentally friendly super-low temperature hydraulic retarder special lubricating cooling medium.

[0030] Detection of various indicators of the product: Example 3: 1. Preparation of mixed base oil: Polyalphaolefin 40.0 grams, trihydroxymethylpropane triheptyl ester 50.0 grams, dioctyl malate 8.0 grams, cardanol polyoxyethylene ether oleic acid ester (CPOA) 5.0 grams, and oil-soluble polyether (OSP) 10.0 grams are sequentially placed in a blending kettle, heated to 60-65°C, and stirred for 30 minutes to obtain the mixed base oil.

[0031] 2. Preparation of environmentally friendly super-low temperature hydraulic retarder special lubricating cooling medium: Poly methyl methacrylate PMMA 4.0 grams is added into the mixed base oil, stirring is kept for 30 minutes, and the temperature is reduced to 45~50 DEG C; then polyethylene glycol adipate sulfonate 4.0 grams, boric acid modified succinimide 3.0 grams, triphenyl phosphorothioate 0.1 gram, acidic phosphate ester ammonium salt 0.2 gram, 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid isooctyl ester 3.0 grams, polyether + fatty acid ester composite defoaming agent 0.02 gram are sequentially added, stirring is kept for 30 minutes, normal temperature filtration (5 μm) is carried out, and the environmentally-friendly ultra-low temperature hydraulic retarder special lubricating cooling medium is obtained.

[0032] The detection of various indexes of the product is as follows: The environmentally-friendly ultra-low temperature hydraulic retarder special lubricating cooling medium has excellent viscosity-temperature performance and low temperature performance, can meet the requirements of all seasons, especially cold regions in winter, has good lubricating performance, can effectively reduce friction and wear, has excellent shear stability, good thermal oxidation stability and long-lasting dispersing performance, ensures the stable long-term lubrication of the oil and the safe operation of the equipment, and is environmentally-friendly and biodegradable.

[0033] 1. Good elastomer compatibility, the product uses four kinds of synthetic oil compounding to change the shortcomings of single component, can play the advantages of different component base oils, solves the adaptability of the sealing material, and has excellent working characteristics.

[0034] 2. The product has good viscosity-temperature characteristics and low temperature performance, excellent low temperature fluidity, can meet the requirements of vehicles in cold regions with a temperature of minus 45 DEG C; good thermal oxidation stability and long-lasting dispersing performance, good friction and lubricating characteristics, and excellent low volatility, ensures that the hydraulic retarder has a long oil change period without oil loss and oil supplement, and ensures the reliability of the energy transmission of the hydraulic retarder from the control system to the working cavity.

[0035] 3. Good sludge and carbon deposit control ability, can effectively inhibit the generation of sludge deposits, keep clean and smooth working conditions for a long time, and the lubricant has a long service life, and the oil change period can be up to 200,000 kilometers.

[0036] 4. Good heat conduction performance and corrosion inhibition performance, which can reduce the working temperature of the system to a certain extent, avoid high temperature oxidation of the lubricant, generation of glue paper and deposits due to high working temperature, effectively solve the problems that the oil temperature of the hydraulic retarder is too high due to poor oil cooling and insufficient lubrication, and ensure effective braking during high-speed driving.

[0037] 5. Good biodegradation characteristics, and the degradation rate is more than 65%.

[0038] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A special lubricating and cooling medium for hydraulic retarder devices, characterized in that, Includes the following components: The base oil composition comprises polyalphaolefin, trimethylolpropane triheptyl ester, dioctyl malate, cashew phenol polyoxyethylene ether oleate (CPOA), and oil-soluble polyether (OSP). And additive compositions, including polymethyl methacrylate (PMMA), detergents, ashless dispersants, anti-abrasion agents, antioxidants and defoamers.

2. The special lubricating and cooling medium for a hydraulic retarder according to claim 1, characterized in that, The detergent is polyethylene adipate sulfonate, the ashless dispersant is boric acid modified succinimide, the anti-wear agent includes triphenyl thiophosphate and acidic phosphate ammonium salt, the antioxidant is isooctyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate, and the defoamer is a polyether and fatty acid ester composite defoamer.

3. The special lubricating and cooling medium for a hydraulic retarder according to claim 1, characterized in that, The base oil composition comprises, by weight: 30-40 parts of polyalphaolefin, 40-50 parts of trimethylolpropane triheptyl ester, 2-8 parts of dioctyl malate, 2-5 parts of cashew phenol polyoxyethylene ether oleate (CPOA), and 5-10 parts of oil-soluble polyether (OSP).

4. The special lubricating and cooling medium for a hydraulic retarder according to claim 1, characterized in that, Based on parts by weight, the additive composition comprises 90 to 100 parts relative to the base oil composition: 3-5 parts of polymethyl methacrylate (PMMA), 3-4 parts of polyethylene adipate sulfonate, 2-3 parts of boric acid-modified succinimide, 1-2 parts of triphenyl thiophosphate, 1-2 parts of acidic phosphate ammonium salt, 2-3 parts of isooctyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate, and 0.01-0.02 parts of polyether and fatty acid ester composite defoamer.

5. A method for preparing a special lubricating and cooling medium for a hydraulic retarder as described in any one of claims 1 to 4, characterized in that, Includes the following steps: Step 1: Preparation of the blended base oil: Polyalphaolefin, trimethylolpropane triheptyl ester, dioctyl malate, cashew phenol polyoxyethylene ether oleate (CPOA) and oil-soluble polyether (OSP) are mixed and stirred under heating conditions to obtain the blended base oil; Step 2: Preparation of lubricating and cooling medium: Add polymethyl methacrylate (PMMA) to the mixed base oil, stir and cool, then add detergent, ashless dispersant, anti-wear agent, antioxidant and defoamer in sequence, continue stirring and filter to obtain the lubricating and cooling medium.

6. The method for preparing a special lubricating and cooling medium for a hydraulic retarder according to claim 5, characterized in that, The heating temperature in step one is 60℃~65℃, and the stirring time is 30 minutes; in step two, the temperature is lowered to 45℃~50℃, the stirring time after adding the additive is 30 minutes, and the filtration is carried out at room temperature using a 5μm filter membrane.

7. The method for preparing a special lubricating and cooling medium for a hydraulic retarder according to claim 5, characterized in that, In step two, the temperature is lowered to 45℃~50℃, the stirring time after adding the additive is 30 minutes, and the filtration is carried out at room temperature using a 5μm filter membrane.

8. A method for preparing a special lubricating and cooling medium for a hydraulic retarder according to claim 5, characterized in that, In step one, by weight, the polyalphaolefin is 30-40 parts, trimethylolpropane triheptyl ester is 40-50 parts, dioctyl malate is 2-8 parts, cashew phenol polyoxyethylene ether oleate (CPOA) is 2-5 parts, and oil-soluble polyether (OSP) is 5-10 parts.

9. A method for preparing a special lubricating and cooling medium for a hydraulic retarder according to claim 5, characterized in that, In step two, by weight, the mixed base oil is 90-100 parts, the added polymethyl methacrylate (PMMA) is 3-5 parts, polyethylene adipate sulfonate is 3-4 parts, boric acid modified succinimide is 2-3 parts, triphenyl thiophosphate is 1-2 parts, acidic phosphate ammonium salt is 1-2 parts, 3,5-di-tert-butyl-4-hydroxyphenylpropionate isooctyl ester is 2-3 parts, and polyether and fatty acid ester composite defoamer is 0.01-0.02 parts.

10. A method for preparing a special lubricating and cooling medium for a hydraulic retarder according to claim 5, characterized in that, The detergent in step two is polyethylene adipate sulfonate, the ashless dispersant is boric acid modified succinimide, the anti-wear agent includes triphenyl thiophosphate and acidic phosphate ammonium salt, the antioxidant is isooctyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate, and the defoamer is a polyether and fatty acid ester composite defoamer.

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