CN110699155B

CN110699155B - Special oil composition for low-viscosity 8AT automatic transmission

Info

Publication number: CN110699155B
Application number: CN201810752710.8A
Authority: CN
Inventors: 郭珍; 安岸斐; 王宁; 张国茹; 杜雪岭; 王向阳; 周轶; 孟震英; 文彦龙
Original assignee: China Petroleum and Chemical Corp
Current assignee: China Petroleum and Chemical Corp
Priority date: 2018-07-10
Filing date: 2018-07-10
Publication date: 2022-04-08
Anticipated expiration: 2038-07-10
Also published as: CN110699155A

Abstract

The invention relates to a low-viscosity oil composition special for an 8AT automatic gearbox, which comprises the following components: friction modifier, extreme pressure antiwear agent, antioxidant; detergent dispersant, metal deactivator, antirust agent, pour point depressant, adhesive, defoaming agent and synthetic base oil. The transmission oil composition provided by the invention is specially developed for an 8AT automatic transmission, the obtained lubricating oil has excellent extreme pressure anti-wear performance, shear stability and oxidation stability, the low viscosity characteristic of the lubricating oil can reduce the oil consumption of the 8AT automatic transmission, and the low-temperature starting requirement of the transmission is ensured.

Description

Special oil composition for low-viscosity 8AT automatic transmission

Technical Field

The invention relates to the field of lubricating oil, in particular to a special oil composition for a low-viscosity 8AT gearbox, which has strong extreme pressure anti-wear performance and excellent oxidation resistance and meets the performance requirements of a friction plate type limited slip differential.

Background

AT present, an automatic gearbox (hereinafter referred to as "AT") is one of automobile parts which are not completely mastered in China, almost all autonomous brand whole automobile factories are developing the AT, and the gear shifting smoothness and the economy are difficult to satisfy. The more advanced automatic transmission technology is 6AT, common vehicle type: popular POLO, Scokada Jingrui, Chevrolet, Sagitar, Mikteng, Baoma 3, Baoma 5, etc. Currently, 8AT is the leading edge product of automatic transmissions, and only two products are being produced in the world, both for rear wheel drive vehicles, in japan and german seikifu.

The ATF oil product of the project is developed aiming AT the front precursor 8 AT. The automatic gearboxes of different technical platforms have different requirements on lubrication, so that the novel gearboxes need to be matched with specific lubricating oil products. The novel 8AT automatic gearbox has large torque, can generate more heat in the running process, and needs oil products with good oxidation resistance; by adopting the common friction plate, the oil product is required to provide stable friction durability; in order to improve the transmission efficiency of the gearbox, the lubricating oil product adopts a low-viscosity technology, and the physical and chemical properties of the lubricating oil product reach those of the current general company

VI highest specification requirement. This requires the use of a specific formulation technology for the 8AT automatic transmission dedicated oil.

Disclosure of Invention

The invention aims to provide special oil for an automatic gearbox, which is suitable for lubricating a low-viscosity 8AT automatic gearbox and aims to solve the technical problem that an oil product needs to have excellent extreme pressure anti-wear performance, oxidation stability, shear stability and friction material adaptability so as to meet the lubricating requirement of the 8AT automatic gearbox.

In order to solve the problems, the invention provides a low-viscosity special oil composition for an 8AT automatic transmission, which comprises the following components in percentage by weight:

preferably, the low-viscosity oil composition specially used for the 8AT automatic gearbox comprises the following components in percentage by weight:

more preferably, the low-viscosity oil composition specially used for the 8AT automatic gearbox comprises the following components in percentage by weight:

preferably, the low-viscosity oil composition special for the 8AT automatic gearbox comprises the following components in percentage by weight:

on the premise of not influencing the performance of the special low-viscosity 8AT automatic gearbox oil composition, a proper amount of additives available in the field can be added.

Further, the total amount of the low-viscosity 8AT automatic transmission special oil composition is 100 percent, and the total amount can be complemented by synthetic base oil.

The invention comprehensively considers a plurality of factors such as kinematic viscosity, extreme pressure anti-wear performance, shearing stability, oxidation stability, friction material adaptability and the like of the special oil composition for the automatic gearbox, carefully selects each base oil component and each additive component in the special oil composition, comprehensively and systematically researches each component oil, each component functional additive and the interaction relationship between the base oil and the additive, and finally screens out the low-viscosity 8AT automatic gearbox oil.

The friction modifier is selected from organic molybdenum, organic sulfur or phosphorus-containing friction modifier, and can make the synthetic automatic transmission oil have proper oiliness and ensure that the synthetic automatic transmission oil has matched static friction coefficient and dynamic friction coefficient.

Preferably, the friction modifier is selected from one or more of fatty amine, fatty amide and borate, and more preferably selected from one or more of benzotriazole octadecylamine salt, nitrogen borate or ethylene glycol oleate.

More preferably, the friction modifier is selected from MoDTC (molybdenum dialkyldithiocarbamate).

The anti-pressure and anti-wear agent is selected from an organic sulfide extreme pressure and anti-wear agent or an organic phosphide extreme pressure and anti-wear agent, and plays a role in preventing the sliding metal surface from being worn, scratched and even sintered under the condition that the metal surface bears the capacity load.

Preferably, the extreme pressure antiwear agent is selected from one or more of sulfurized isobutylene, sulfurized olefin, triphenyl thiophosphate, monoalkyl long-chain acidic phosphite ester and hydroxyl-containing thiadiazole derivative.

More preferably, the extreme pressure antiwear agent is selected from sulfurized isobutylene or dialkyl phosphites.

The antioxidant is selected from ashless aromatic amine antioxidants or hindered phenol antioxidants, has strong oxidation resistance, can inhibit the oxidation of the lubricating oil, and can reduce the generation of precipitates, paint films and oil sludge, thereby inhibiting the increase of the viscosity of the lubricating oil.

Preferably, the antioxidant is selected from one or more of dialkyl diphenylamine, sulfurized terpene, styrenated diphenylamine, phenolic antioxidants, preferably a mixture of styrenated diphenylamine and phenolic antioxidants.

The detergent dispersant is selected from an ash-containing detergent dispersant or an ash-free detergent dispersant, and can inhibit and reduce substances such as oil sludge, paint films and the like generated by oxidation.

Preferably, the detergent dispersant is one or a mixture of two of boronated succinimide and synthetic calcium sulfonate.

The metal deactivator is an organic heterocyclic compound, and can avoid the catalytic acceleration effect of metal ions on the autoxidation of the lubricating oil and hinder the catalytic effect of metals.

Preferably, the metal deactivator is selected from one or more of a mixture of benzotriazole derivatives, thiadiazole derivatives and sulfur-containing carbon heterocyclic compounds; preferably a mixture of thiadiazole derivatives and sulfur-containing carbon heterocyclic compounds.

In particular, the metal deactivator is selected from the dodecylammonium benzenetriazolate.

Preferably, the antirust agent is selected from one or more of alkyl phenate, sulfonate and amine compound; preferably a mixture of a sulfonate and an amine compound.

More preferably, the rust inhibitor is zinc naphthenate.

Preferably, the pour point depressant is one or more of polymethacrylate, alkyl naphthalene and poly alpha olefin; preferably, the pour point depressant is a mixture of alkylnaphthalenes and polyalphaolefins.

The finger-sticking agent (i.e. viscosity index improver) is polyisobutylene; or the adhesive is a copolymer of styrene and diene. The finger-sticking agent can increase the viscosity of oil products, improve the viscosity index, has good low-temperature starting performance and reduces the abrasion.

Preferably, the adhesive is a copolymer of styrene and isoprene.

The antifoaming agent is an organosilicon antifoaming agent or a composite antifoaming agent, is adsorbed on a foamed membrane in a highly dispersed colloidal particle form, and is thinned until the membrane is broken by reducing surface tension, expanding and the like, so that the defoaming purpose is achieved, foaming during high-speed circulation in a narrow oil path can be inhibited, the oil pressure is stable, and sintering is prevented.

Preferably, the anti-foaming agent is a mixture of polymethylsilicone oil and a copolymer of acrylate and ether.

Preferably, the synthetic base oil is a synthetic hydrocarbon base oil or a synthetic ester base oil; for example, it may be selected from hydrogenated base oils No. 4 and/or No. 6.

Further preferably, the synthetic base oil is synthetic hydrocarbon base oil or synthetic ester base oil, and is used in combination with oil-soluble polyalkylene glycol.

The traditional polyether base oil is a linear polymer prepared by ring-opening homopolymerization or copolymerization of ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran and the like serving as raw materials under the action of a catalyst. The oil-soluble polyalkylene glycol is not a traditional Ethylene Oxide (EO) and Propylene Oxide (PO) homopolymerization copolymer polymer, but an oil-soluble polymer prepared by block polymerization, random copolymerization and reverse block polymerization, and has the following advantages: the polyether base oil has the advantages of wide viscosity grade, high viscosity index, excellent high and low temperature performance, high oil film strength, excellent deposition control and equipment cleanness, no hydrolysis, safe use, outstanding performances in aspects of elastomer compatibility, hygroscopicity and the like, and particularly solves the problem of poor solubility of the conventional polyether base oil and other base oils through an alkoxylation chemical technology. The oil-soluble polyalkylene glycol also has high biodegradation rate, and is high-quality environment-friendly base oil.

The starting materials used in the present invention are commercially available or may be prepared by methods conventional in the art.

On the basis of the common knowledge in the field, the above preferred conditions can be combined with each other to obtain the preferred embodiments of the invention.

Further, it is to be understood that terms such as "comprising," "including," "containing," and the like, also include "consisting of … …," "consisting of … …," "made of … …," and the like, herein.

The special oil composition for the 8AT automatic gearbox can be prepared by the conventional technical means, and in order to obtain a higher-quality composition, the invention also provides a preparation method of the composition, which comprises the following steps: mixing the above materials at a certain ratio by automatic batch blending or synchronous dosage blending, and stirring at 45-55 deg.C for 2-4 hr.

The invention optimizes and selects the specific composition of the composition and the addition amount of each component, thereby realizing the optimal synergistic effect. The fine adjustment of the types or the dosage of the additives in the lubricating oil can affect the comprehensive performance of the lubricating oil, and a large number of experiments prove that the lubricating oil composition can simultaneously meet the lubricating requirements of an 8AT automatic gearbox and has excellent extreme pressure anti-wear performance, oxidation stability, shear stability and friction material adaptability.

Detailed Description

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. The examples do not show the specific techniques or conditions, according to the technical or conditions described in the literature in the field, or according to the product specifications. The reagents or instruments used are conventional products available from regular distributors, not indicated by the manufacturer.

Example 1

A low-viscosity 8AT automatic transmission special oil composition comprises the following components in percentage by weight:

MoDTC	0.5％；
		sulfurized isobutylene	2.0％；
Dialkyl diphenylamine	1.5％；
		Sulfonic acid calcium salt	1.0％；
Dodecyl benzene triazole ammonium salt	0.6％；
		Zinc naphthenate	0.5％；
Polymethacrylate	2.0％；
		Styrene and isoprene copolymer	1.0％；
Polymethyl silicone oil	300ppm
		Hydrogenated base oils No. 4 and No. 6	And (4) the balance.

Example 2

the properties of examples 1-2 were evaluated as follows in Table 1:

TABLE 1 analysis data of oil compositions for low viscosity 8AT automatic transmissions

The test results provided in table 1 show that the oil composition special for the 8AT automatic transmission provided by the invention has excellent performance, excellent extreme pressure antiwear performance, oxidation stability, shear stability and friction material adaptability, thereby meeting the lubrication requirement of the 8AT automatic transmission. Meanwhile, the actual blending operation of the oil product is simple and convenient, and the method has wide application prospect. Among these, the composition provided in example 1 has the best overall properties.

Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A low-viscosity 8AT automatic transmission special oil composition is characterized by comprising the following components in percentage by weight:

a) at least one friction modifier: 0.5 to 1.6 percent

b) At least one extreme pressure antiwear agent: 2.0 to 3 percent

c) At least one antioxidant: 1.5 to 2 percent

d) At least one detergent dispersant: 1.0 to 1.8 percent

e) At least one metal deactivator: 0.6 to 0.8 percent

f) At least one rust inhibitor: 0.5 to 0.8 percent

g) At least one pour point depressant: 2.0 to 2.5 percent

h) At least one finger adhesive: 1.0 to 1.5 percent

i) And (3) anti-foaming agent: 0-300 ppm;

j) synthesizing base oil: proper amount;

the friction modifier is MoDTC;

the extreme pressure antiwear agent is sulfurized isobutylene or dialkyl phosphite ester;

the antioxidant is dialkyl diphenylamine or sulfurized terpene;

the detergent dispersant is calcium sulfonate;

the metal deactivator is phenyltriazole dodecyl ammonium salt;

the antirust agent is zinc naphthenate;

the pour point depressant is polymethacrylate;

the adhesive is a styrene and isoprene copolymer

The synthetic base oil is hydrogenated base oil No. 4 and/or No. 6; or the synthetic base oil is a mixture of hydrogenated base oil No. 4 and/or No. 6 and oil-soluble polyalkylene glycol.

2. The composition of claim 1, wherein the low viscosity 8AT automatic transmission dedicated oil composition makes up to 100% of the total amount of the synthetic base oil.

3. The composition of claim 1, wherein the anti-foaming agent is a silicone anti-foaming agent or a composite anti-foaming agent.

4. The composition of claim 1, wherein the anti-foaming agent is a mixture of polymethylsilicone oil and a copolymer of acrylate and ether.

5. The composition of claim 1, wherein the anti-foaming agent is polymethylsilicone oil.

6. The composition according to claim 1, characterized by comprising the following components in percentage by weight:

MoDTC 0.5%；

2.0% of sulfurized isobutylene;

1.5 percent of dialkyl diphenylamine;

1.0% of calcium sulfonate;

0.6% of phenyltriazole dodecyl ammonium salt;

0.5 percent of zinc naphthenate;

2.0% of polymethacrylate;

1.0% of styrene-isoprene copolymer;

polymethylsilicone oil 300ppm

The balance of hydrogenated base oil No. 4 and No. 6.

7. A low-viscosity oil composition special for an 8AT automatic transmission is characterized by comprising the following components in percentage by weight:

MoDDP 1.6%；

3.0% of dialkyl phosphite ester;

2.0% of sulfurized terpene;

1.8 percent of calcium sulfonate;

0.8% of phenyltriazole dodecyl ammonium salt;

0.8 percent of zinc naphthenate;

1.5% of polymethacrylate;

styrene and isoprene copolymer 1.5%;

300ppm of polymethylsilicone oil;

oil-soluble polyalkylene glycol 5%

The balance of No. 4 hydrogenated base oil.

8. A method for preparing a low viscosity 8AT automatic transmission dedicated oil composition according to any one of claims 1 to 7, comprising: mixing the above materials at a certain ratio by automatic batch blending or synchronous dosage blending, and stirring at 45-55 deg.C for 2-4 hr.