A long-life hydraulic oil composition for injection molding machines and a method for producing the same

Abstract

The present application relates to the field of hydraulic oil composition, in particular to a long-life injection molding machine special hydraulic oil composition and a preparation method thereof.The composition comprises the following components by weight percentage: 0.2-2.0% of phenolic antioxidant, 0.1-1.0% of amine antioxidant, 0.1-0.8% of anti-rust agent, 0.1-2.5% of anti-wear hydraulic oil multifunctional additive, 0.01-2.5% of pour point depressant, 0.001-0.05% of anti-foaming agent, and the balance of base oil; the base oil is PAO and / or CTL base oil.The hydraulic oil composition provided by the present application can reduce the hydraulic system pipeline resistance and prevent leakage, and has outstanding viscosity-temperature performance, excellent oxidation resistance, long service life, and excellent anti-rust and anti-corrosion performance, extreme pressure and wear resistance, and low temperature fluidity, thereby ensuring effective transmission of hydraulic energy, effectively reducing the generation of oxides, prolonging the oil change cycle, and providing protection for long-term reliable and stable operation of the injection molding machine hydraulic oil system.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic oil compositions, and in particular to a hydraulic oil composition special for long-life injection molding machines and a preparation method thereof. Background Art

[0002] The current development trend of mechanical equipment is toward smaller size, lighter weight, higher efficiency, and longer lifespans. Lubricants are also being upgraded accordingly, with the addition of high-efficiency additives and other polar substances. Injection molding machines, capable of forming complex, precisely dimensioned plastic products or those with metal inserts in a single operation, are widely used in defense, electromechanics, automotive, transportation, building materials, packaging, agriculture, culture, education, health, and everyday life, accounting for approximately half of the plastics machinery industry. Compared to foreign injection molding machines, domestic ones currently suffer from larger size, lower molding precision, and higher energy consumption. Energy conservation is a key requirement, therefore, reducing energy consumption and increasing the added value and competitiveness of domestic injection molding machines are urgent.

[0003] For injection molding machines, the most significant energy-saving effects are seen in the hydraulic and control systems. Hydraulic transmission uses liquid as the working medium and leverages liquid pressure to achieve mechanical motion or energy transfer and control. In a hydraulic system, hydraulic oil not only transfers energy but also ensures system efficiency. Using hydraulic oil with a high viscosity index can improve hydraulic system efficiency, resulting in superior energy savings.

[0004] Hydraulic oil, the working and lubricating medium of the hydraulic systems of injection molding machines, is in high demand. However, a "long-life hydraulic oil specifically designed for injection molding machines" with outstanding energy-saving performance has not yet been sold or used. Faced with the current increasingly severe energy shortage, the development of a long-life hydraulic oil specifically designed for injection molding machines that can be widely used is of great significance. Summary of the Invention

[0005] To address the above technical problems, the present invention provides a long-life hydraulic oil composition specifically designed for injection molding machines and its preparation method. This hydraulic oil composition can reduce hydraulic system pipeline resistance and prevent leakage. It also exhibits outstanding viscosity-temperature performance, excellent antioxidant properties, a long lifespan, and excellent rust and corrosion resistance, extreme pressure and wear resistance, and low-temperature fluidity. It ensures efficient transmission of hydraulic energy, effectively reduces the formation of oxides, and extends oil change intervals, thus ensuring the long-term, reliable, and stable operation of the hydraulic oil system of the injection molding machine.

[0006] The present invention provides a long-life hydraulic oil composition for injection molding machines, which comprises the following components in percentage by weight:

[0007]

[0008] The base oil is PAO and / or CTL base oil.

[0009] The present invention provides a durable and long-life hydraulic oil for injection molding machines. By optimizing the base oil and various additives and their usage, the composition has excellent oxidation stability, rust and corrosion resistance, extreme pressure and anti-wear properties, and low-temperature fluidity, thereby better ensuring the effective transmission of hydraulic energy, effectively reducing the formation of oxides, extending the oil change cycle, and providing better protection for the long-term reliable and stable operation of the hydraulic oil system of the injection molding machine.

[0010] Preferably, the long-life hydraulic oil composition for injection molding machines comprises the following components in percentage by weight:

[0011]

[0012]

[0013] More preferably, the following components are included in percentage by weight:

[0014]

[0015] The present invention optimizes the amount of base oil and various additives to better solve the above problems and further improve the overall performance.

[0016] More preferably, the PAO base oil is PAO6 and / or PAO8; and / or the CTL base oil is CTL6 and / or CTL8. The present inventors have discovered that using specific PAOs and CTLs as the base oil for a hydraulic oil composition specifically for injection molding machines, combined with the additive system of the present invention, can significantly improve various performance aspects of the oil composition compared to existing hydraulic oils specifically for injection molding machines.

[0017] Further preferably, the amine-type antioxidant is selected from one or more of dialkyldiphenylamine, alkylated diphenylamine, and dioctyldiphenylamine, preferably dialkyldiphenylamine; and / or, the phenol-type antioxidant is selected from one or more of liquid phenol, methylene 4,4'-thiobis-(2,6-di-tert-butylphenol), 2,6-di-tert-butyl α-dimethylamino-p-cresol, and 2,6-di-tert-butyl-p-cresol, preferably 2,6-di-tert-butyl-p-cresol.

[0018] In the present invention, the preferred amine antioxidant is dialkyldiphenylamine, which has a high operating temperature, good antioxidant durability, and is effective in extending the induction period and inhibiting late-stage oxidation of the oil. Furthermore, the preferred phenolic antioxidant is 2,6-di-tert-butyl-p-cresol, which has even better antioxidant properties and is effective in extending the induction period, with optimal performance at operating temperatures below 100°C. In the present invention, the proportionate use of these preferred antioxidants in the system improves the antioxidant properties of the composition. In particular, the combination of the phenolic antioxidant T501 and the amine antioxidant ADPA-98 in specific amounts in the base oil and additive system of the present invention further enhances overall performance, making it more suitable for injection molding machines.

[0019] More preferably, the kinematic viscosity of the anti-wear hydraulic oil multifunctional additive at 40°C is 65-90 mm 2 / s, sulfur content 5-25%, phosphorus content 2-6%, zinc content 2-6%, preferably, the kinematic viscosity of the anti-wear hydraulic oil multifunctional additive at 40°C is 70-90mm 2 / s, a sulfur content of 6-9%, a phosphorus content of 3-4%, and a zinc content of 4-6%, more preferably LZ 5703 and / or Hitec 521.

[0020] The multifunctional anti-wear hydraulic oil additive preferably used in the present invention is mainly composed of anti-wear agent, rust inhibitor and antioxidant, and is mixed with metal deactivator, demulsifier and anti-foaming agent (appearance is amber transparent liquid). In particular, the kinematic viscosity at 40℃ is 70-90mm 2 A multifunctional anti-wear hydraulic oil additive having a parameter range of 6-8% sulfur content (all by mass fraction), 3-4% phosphorus content, and 2-5% zinc content can better interact with the preferred base oil and antioxidant additives of the present invention, promoting synergistic efficiency of the various components of the system. The hydraulic oil formulated with this multifunctional additive not only has excellent rust resistance, corrosion resistance, and antioxidant properties, but also has outstanding comprehensive properties such as extreme pressure and anti-wear performance, which can greatly reduce wear of hydraulic pumps and other components and extend the service life of the machinery. The present invention most preferably uses Afton Chemical's Hitec 521 and Lubrizol Corporation's LZ 5703. Their typical technical indicators (the technical indicators of Hitec 52 and LZ 5703 used in the examples are the values ​​in the table here) are shown in Tables 1 and 2 below.

[0021] Table 1 Physical and chemical data of Hitec 521

[0022] project Typical values Test methods Kinematic viscosity (40°C), mm 2 / s]]> 75 GB / T 265 <![CDATA[密度,kg / m 3 ]]> 1030 GB / T 1884 Flash point (closed cup), ℃ 125 GB / T 3536 Sulfur content, % (mass fraction) 8.4 GB / T 388 Phosphorus content, % (mass fraction) 3.96 SH / T 0296 Zinc content, % (mass fraction) 5.04 SH / T 0226

[0023] Table 2 Physicochemical data of LZ 5703

[0024] project Typical values Test methods Kinematic viscosity (40°C), mm 2 / s]]> 86 GB / T 265 <![CDATA[密度,kg / m 3 ]]> 1023 GB / T 1884 Flash point (closed cup), ℃ 110 GB / T 3536 Sulfur content, % (mass fraction) 7.70 GB / T 388 Phosphorus content, % (mass fraction) 3.90 SH / T 0296 Zinc content, % (mass fraction) 4.87 SH / T 0226

[0025] More preferably, the rust inhibitor is selected from one or more of dinonylnaphthalene sulfonate, alkylbenzoic acid, phosphate ester, and benzotriazole, preferably phosphate ester.

[0026] More preferably, the pour point depressant is an alkylnaphthalene, polymethacrylate, or poly-α-olefin, preferably a poly-α-olefin. In the system of the present invention, when Vx1-248 is used as the pour point depressant and T747 is used as the rust inhibitor, the resulting long-life hydraulic oil composition for injection molding machines has further improved overall performance compared to hydraulic oil compositions using other pour point depressants and rust inhibitors.

[0027] Further preferably, the antifoaming agent is a silicone and / or non-silicone antifoaming agent, preferably a silicone and non-silicone composite antifoaming agent. In the long-life hydraulic oil composition for injection molding machines of the present invention, the antifoaming agent is a mixture of one or both silicone and non-silicone antifoaming agents, preferably polymethyl silicone oil (T901) or polyacrylate (T912). If the specific antifoaming agent is added in too small a proportion, the foaming properties of the hydraulic oil will be affected, while if added in too large a proportion, the air release characteristics of the hydraulic oil will be affected. In the system of the present invention, the use of the specific polymethyl silicone oil T901 antifoaming agent can further improve the overall performance of the hydraulic oil.

[0028] Further preferably, the long-life hydraulic oil composition for injection molding machines provided by the present invention is composed of the following components in percentage:

[0029]

[0030]

[0031] Alternatively, it may be composed of the following components in the following percentages:

[0032]

[0033] In a second aspect, the present invention provides a method for preparing the long-life hydraulic oil composition for injection molding machines, comprising: mixing the components according to a proportion, and stirring at 50-65° C. for 2-3 hours. The preparation method of the present invention is simple and the preparation conditions are mild.

[0034] The beneficial effects of the present invention are at least as follows: the long-life hydraulic oil composition for injection molding machines provided by the present invention is synergistically formulated by adding specific types and amounts of hydraulic oil multifunctional compounding agents, antioxidants, rust inhibitors, viscosity index improvers, pour point depressants, antifoaming agents, and other functional additives to specific PAO and CTL base oils, resulting in outstanding viscosity-temperature performance (viscosity index 160-180), as well as excellent antioxidant and low-temperature performance, as well as excellent anti-wear and rust-proof properties. Furthermore, the product of the present invention has a reasonable raw material compatibility, a simple preparation method, a wide range of applications, and readily available raw materials. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0036] If specific techniques or conditions are not specified in the examples, the techniques or conditions described in the literature in the field or in the product instructions shall be followed. The implementation conditions in the examples can be further adjusted according to specific experimental conditions or factory conditions. If the implementation conditions are not specified, they are generally those in routine experiments.

[0037] Unless otherwise specified, the materials and reagents used in the following examples can be obtained from commercial sources.

[0038] The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0039] Examples 1-6

[0040] The components of the long-life hydraulic oil composition for injection molding machines provided in the examples are shown in Table 3. The preparation process is as follows: the fully synthetic base oil is first heated to 60° C. in a blending container, and then a viscosity index improver, pour point depressant, anti-wear hydraulic oil multifunctional additive, and antioxidant are added and stirred until uniform and transparent. Then, an anti-foaming agent is added according to the proportion and stirred for 2 to 3 hours.

[0041] Table 3 Content of each component of Examples 1-6

[0042]

[0043] The PAO base oils in the above examples are pure decene PAO6 and PAO8 produced by Maoming Petrochemical using C10 olefins as raw materials; the CTL base oils are CTL6 and CTL8 produced by Lu'an Group.

[0044] Phenolic antioxidant T501 was purchased from Liaoning Tianhe Fine Chemical Co., Ltd., amine antioxidant ADPA-98 was purchased from Jinzhou Kangtai Lubricating Additives Co., Ltd., and anti-wear hydraulic oil multifunctional additive LZ 5703 was purchased from Lubrizol Corporation. Hitec 521, an anti-wear hydraulic oil multifunctional additive, was purchased from Afton Chemical Co., Ltd., and anti-foaming agent T901 was purchased from Danyang Tianyu Petroleum Additives Factory. Pour point depressant Vx1-248 was purchased from Evonik AG. Rust inhibitor T747 was purchased from Jinzhou Kangtai Lubricating Additives Co., Ltd.

[0045] Various performance evaluations were performed on Examples 1-6, and the results are shown in Table 4 below:

[0046] Table 4 Test data of Examples 1-6

[0047]

[0048] Analysis shows that the viscosity index of the injection molding machine oils obtained in Examples 1 to 6 is all between 160 and 180, which is a more suitable viscosity index range than existing injection molding machine oils. The pour points of No. 32 are all less than -55°C, and No. 46 are all less than -50°C. This indicates that the hydraulic oils for injection molding machines have better low-temperature performance than existing injection molding machine oils. At the same time, the rotary oxygen bomb values ​​are all greater than 500 min, indicating that the products of the present invention are also extremely excellent in terms of antioxidant performance and other indicators. The analysis results show that the long-life hydraulic oil for injection molding machines of the present invention has excellent viscosity-temperature performance and low-temperature performance, and also has excellent comprehensive performance in terms of antioxidant performance, corrosion and rust prevention.

[0049] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the present invention. Therefore, such modifications and improvements, which do not depart from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. A long-life hydraulic oil composition for injection molding machines, characterized in that: The composition includes the following weight percentages: Phenolic antioxidant 0.3~1.0%; Amine antioxidant 0.15~0.5%; Rust inhibitor 0.2~0.7%; Anti-wear hydraulic oil multifunctional additive 0.4~2.0%; Pour point depressant 0.05~2.0%; Antifoaming agent 0.001~0.05%; PAO or CTL base oil balance; The PAO base oil is PAO6 and / or PAO8; the CTL base oil is CTL6 and / or CTL8; The rust inhibitor is a phosphate ester; The pour point depressant is a poly-alpha-olefin; The amine antioxidant is selected from alkylated diphenylamine; the phenol antioxidant is selected from one or more of liquid phenol, methylene 4,4'-thiobis-(2,6-di-tert-butylphenol), 2,6-di-tert-butyl α-dimethylamino-p-cresol, and 2,6-di-tert-butyl-p-cresol; The kinematic viscosity of the anti-wear hydraulic oil multifunctional additive at 40°C is 65-90 mm 2 / s, sulfur content 5~25% by mass, phosphorus content 2~6% by mass, zinc content 2~6% by mass; The anti-foaming agent is polymethyl silicone oil.

2. The long-life hydraulic oil composition for injection molding machines according to claim 1, characterized in that: The composition includes the following weight percentages: Phenolic antioxidant 0.4~0.8%; Amine antioxidant 0.2~0.4%; Rust inhibitor 0.3~0.5%; Anti-wear hydraulic oil multifunctional additive 0.5~1.0%; Pour point depressant 0.1~1.0%; Antifoaming agent 0.006~0.008%; PAO or CTL base oil allowance.

3. The long-life hydraulic oil composition for injection molding machines according to claim 2, characterized in that: The amine antioxidant is dialkyldiphenylamine; and / or The phenolic antioxidant is 2,6-di-tert-butyl-p-cresol.

4. The long-life hydraulic oil composition for injection molding machines according to claim 3, characterized in that: The kinematic viscosity of the anti-wear hydraulic oil multifunctional additive at 40°C is 70-90 mm 2 / s, sulfur content by mass is 6~9%, phosphorus content by mass is 3~4%, and zinc content by mass is 4~6%.

5. The long-life hydraulic oil composition for injection molding machines according to claim 4, characterized in that: The multifunctional additive for anti-wear hydraulic oil is LZ 5703 or Hitec 521.

6. The long-life hydraulic oil composition for injection molding machines according to claim 5, characterized in that: It is composed of the following components in percentage by weight: 2,6-di-tert-butyl-p-cresol 0.4~0.8% Dialkyl diphenylamine 0.2~0.4% Phosphate 0.3~0.5% Hitec 521 0.5~1.0 % Polyalphaolefin 0.1~1.0% Polymethyl silicone oil 0.006~0.008% PAO and / or CTL base oil balance; Alternatively, it is composed of the following components in percentage by weight: 2,6-di-tert-butyl-p-cresol 0.4~0.8% Dialkyl diphenylamine 0.2~0.4% Phosphate 0.3~0.5% LZ 5703 0.5~1.0% Polyalphaolefin 0.1~1.0% Polymethyl silicone oil 0.006~0.008% PAO and / or CTL base oil balance.

7. The method for preparing the long-life hydraulic oil composition for injection molding machines according to any one of claims 1 to 6, characterized in that: include: Mix the components according to the ratio and stir at 50~65℃ for 2~3h.

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