Biodegradable lubricating grease for large-diameter multi-layer strand steel wire rope and preparation method of biodegradable lubricating grease

Abstract

The invention discloses biodegradable lubricating grease for a large-diameter multi-layer strand steel wire rope and a preparation method of the biodegradable lubricating grease. The lubricating grease comprises the following raw materials in percentage by mass: 80-90% of degradable plastic, 4-8% of an adhesive, 2-5% of an extreme pressure anti-wear agent and 1-3% of an anti-rust agent. The degradable plastic is used as the base oil of the lubricating grease, no extra thickening agent needs to be added, the production process is simplified, it can be guaranteed that an oil film has a certain thickness under the high-temperature condition of the product, the product is endowed with good bearing capacity, and the use requirement of the product under the high load condition is met; the prepared biodegradable lubricating grease for the large-diameter multi-layer strand steel wire rope has excellent adhesion, is high in dropping point and not prone to dropping, and can well meet the use requirement of the large-diameter multi-layer strand steel wire rope for the lubricating grease.

Description

Technical Field

[0001] The invention relates to a biodegradable grease for a large-diameter multi-layered steel wire rope and a preparation method thereof. Background Art

[0002] The Three Gorges Shiplift is the world's largest shiplift with the most complex operating conditions and the highest technical difficulty. Its equipment and facilities are of various types and the technology is complex. Among them, the shiplift lifting system is composed of hundreds of large-diameter steel wire ropes, and the large-diameter multi-layer steel wire ropes used in the shiplift determine the safe operation of the entire shiplift. If it fails, it will cause the ship to take a long time to enter and exit the cabin, the ship will collide with the shiplift equipment and facilities, and the water level changes in the pilot channel will affect the operation. These problems affect the operation efficiency and safety of the shiplift. However, the shiplift has unfavorable factors such as low speed and heavy load during operation, the oil film is easy to rupture, and it is not easy to lubricate.

[0003] The counterweight system has the characteristics of complex operating environment, poor maintenance conditions, long and large number of wire ropes, and difficulty in replacing them after damage. From the current operating conditions, rust, wear and wire breakage inside and outside the wire rope are the main reasons for wire rope damage and even scrapping. At the same time, the wire rope and pulley will also be damaged by the repeated action of load gravity and various complex stresses, forming irreparable equipment defects and affecting the safe operation of the ship lift. In addition, the low-speed, heavy-load, large-diameter, multi-layer wire ropes currently in use are all asphalt-based products, which are not biodegradable and are prone to dripping when the temperature is high, polluting the environment. Summary of the invention

[0004] In order to at least partially solve the above technical problems, the present invention provides a grease product with a high biodegradation rate, which can adhere to the steel wire rope and is not easy to drip in summer, so as to reduce the problems of rust, wear and wire breakage in the large-diameter multi-layer steel wire rope of the ship lift in actual applications, extend the service life of the steel wire rope, and maintain the smooth operation of the ship lift counterweight system.

[0005] As one aspect of the present invention, it relates to a biodegradable grease for large-diameter multi-layered steel wire rope. The grease comprises the following constituent raw materials by mass percentage: 80-90% of degradable plastic, 4-8% of adhesive, 2-5% of extreme pressure anti-wear agent, and 1-3% of rust inhibitor.

[0006] In one or some preferred embodiments, the degradable plastic is selected from one or more of polycaprolactone, polylactic acid, polyhydroxyalkanoate, aliphatic aromatic copolyester, polyvinyl alcohol, carbon dioxide copolymer or polybutylene succinate type degradable plastic.

[0007] In one or some preferred embodiments, the adhesive is selected from a polymer; or a miscible substance of a polymer and the degradable plastic.

[0008] In one or some preferred embodiments, the high molecular weight polymer is selected from polyisobutylene and / or polymethacrylate.

[0009] In one or some preferred embodiments, the extreme pressure anti-wear agent is sulfurized olefin cottonseed oil.

[0010] In one or some preferred embodiments, the rust inhibitor is an ester rust inhibitor.

[0011] In one or some preferred embodiments, the ester rust inhibitor is selected from one or more of pentaerythritol monooleate, sorbitan monooleate and / or polyol ester.

[0012] As another aspect of the present invention, it relates to a method for preparing the above-mentioned biodegradable grease for large-diameter multi-layer steel wire rope, comprising the following steps:

[0013] S1. heating the degradable plastic under stirring;

[0014] S2. Cooling and shearing the heated biodegradable plastic in S1 to disperse it, and adding adhesive, extreme pressure anti-wear agent and rust inhibitor in sequence under stirring, and grinding to obtain grease.

[0015] The present invention adopts biodegradable plastic as the base oil of grease, which not only does not need to add additional thickeners, simplifying the production process, but also can ensure that the oil film of the product has a certain thickness under high temperature conditions, giving the product good load-bearing capacity and meeting the use requirements of the product under high load; adding high molecular polymer as an adhesive can utilize the characteristic of high molecular polymer that it can form a strong oil film to firmly wrap the steel wire rope, thereby preventing high-speed and large-scale water flow from scouring the steel wire rope and entering the interior of the rope, thereby corroding the steel wire rope from the inside and accelerating the corrosion of the steel wire rope.

[0016] The biodegradable grease for low-speed, heavy-load, large-diameter multi-layer steel wire rope prepared by the present invention has the following advantages: 1) simple preparation process; 2) excellent lubrication and protection performance; 3) biodegradation rate can reach more than 70%.

[0017] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and claims. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with specific embodiments, and the protection scope of the present invention is not limited by the following embodiments. The sources of the materials mainly involved in the embodiments are shown in Table 1 below, and other materials not shown are conventional commercial products.

[0019] Table 1 Material source description

[0020] Serial number product Specifications / Models factory 1 Polybutylene Succinate 3001MD Japan Showa 2 Polycaprolactone XW2498041403 Sichuan Zhuoxin Biomaterials Co., Ltd. 3 Polylactic acid PLA 4032D NatureWorks 4 Sulfurized olefin cottonseed oil T405 Jinzhou Shengda Chemicals Co., Ltd.

[0021] The inventors considered the factors that the lubricating oil film is easy to break under low speed and heavy load conditions, and made the present invention through further research and development. The following are Examples 1 to 3 of the present invention and a comparative example.

[0022] Example 1

[0023] The grease product of this embodiment is prepared by the following method:

[0024] Under stirring conditions, heat 12kg of polybutylene succinate type biodegradable plastic to 150℃; cool and shear and disperse until the temperature drops to about 80℃; under stirring conditions, add 700g of 100℃ kinematic viscosity 180mm 2 / s polymethacrylate (high molecular polymer), 500g sulfurized olefin cottonseed oil (extreme pressure anti-wear agent), 300g pentaerythritol monooleate (rust inhibitor), after stirring for 60 minutes, take out of the kettle and grind to obtain the grease product.

[0025] Example 2

[0026] The grease product of this embodiment is prepared by the following method:

[0027] Under stirring conditions, 3 kg of polycaprolactone biodegradable plastic and 9 kg of polybutylene succinate biodegradable plastic were heated to 150°C; the temperature was lowered and sheared and dispersed until the temperature dropped to about 80°C; under stirring conditions, 900 g of 100°C kinematic viscosity of 150 mm 2 / s polyisobutylene (high molecular polymer), 640g sulfurized olefin cottonseed oil (extreme pressure anti-wear agent), 360g sorbitan monooleate (rust inhibitor), after stirring for 60 minutes, take out of the kettle and grind to obtain the grease product.

[0028] Example 3

[0029] The grease product of this embodiment is prepared by the following method:

[0030] Under stirring conditions, 6 kg of polylactic acid type biodegradable plastic and 6 kg of polybutylene succinate type biodegradable plastic were heated to 150°C; the temperature was lowered and sheared and dispersed until the temperature dropped to about 80°C; under stirring conditions, 850 g of 100°C kinematic viscosity of 150 mm 2 / s polyisobutylene (high molecular polymer), 640g sulfurized olefin cottonseed oil (extreme pressure anti-wear agent), 360g sorbitan monooleate (rust inhibitor), stirred for 60 minutes, then removed from the kettle and ground to obtain a grease product.

[0031] Comparative Example 1

[0032] Referring to patent number CN104250575 A, the preparation method of grease is as follows:

[0033] Put 500g of high-viscosity base oil into the kettle, heat it to 100℃ and let it stand for dehydration, add 5g of polymer A and 50g of polymer B, heat it to about 180℃ and stir for 2 hours; cool it to 120-160℃, add 320g of low-viscosity base oil, 30g of microcrystalline wax and 50g of nitrogen-containing compound, stir for 2 hours, and keep the stirring speed at 200-400r / min; cool it to between 120-130℃, add 15g of extreme pressure anti-wear agent and 30g of rust inhibitor, stir at constant temperature for 1 hour, and then fill it out of the kettle.

[0034] The following performance tests were performed on Examples 1 to 3 and Comparative Example 1, and the test results are recorded in Table 2 below.

[0035] Table 2 Performance test data

[0036]

[0037]

[0038] From the performance test results recorded in Table 2, it can be seen from Examples 1 to 3 and Comparative Example 1 that:

[0039] The preparation method adopted by the present invention is simple, and the product has the characteristics of excellent protective performance and high biodegradation rate; the preparation process of the comparative example is cumbersome and the biodegradation rate is low; the dropping point of the comparative example is only 86°C, and the grease is easy to drop and cause pollution in hot weather; the maximum no-seizure load and sintering load of the comparative example are only 617.8N and 1560N, and the wear spot diameter is about 23% higher than that of the embodiment; the biodegradation rates of Examples 1, 2, and 3 are 71.3%, 74.1%, and 74.7%, respectively; the biodegradation rate of the comparative example is only 31.2%. The product has been used on low-speed, heavy-load, large-diameter multi-layer strand steel wire ropes for half a year, and all the use requirements have been met.

[0040] The above are only preferred feasible embodiments of the present invention, and the protection scope of the present invention is not limited thereto. Various modifications or applications made according to the above embodiments are within the protection scope of this technical solution.

[0041] Although the specific embodiments of the present invention have been described in detail, it will be understood by those skilled in the art. According to all the teachings disclosed, various modifications and replacements can be made to those details, and these changes are all within the protection scope of the present invention. The full scope of the present invention is given by the attached claims and any equivalents thereof.

Claims

1. Biodegradable grease for large diameter multi-layered steel wire rope, characterized in that: Calculated by mass percentage, the composition comprises the following raw materials: 80-90% of degradable plastic, 4-8% of adhesive, 2-5% of extreme pressure anti-wear agent, and 1-3% of rust inhibitor.

2. The biodegradable grease for large-diameter multi-layered steel wire rope according to claim 1, characterized in that: The degradable plastic is selected from one or more of polycaprolactone, polylactic acid, polyhydroxyalkanoate, aliphatic aromatic copolyester, polyvinyl alcohol, carbon dioxide copolymer or polybutylene succinate type degradable plastic.

3. The biodegradable grease for large-diameter multi-layer steel wire rope according to claim 1, characterized in that: The adhesive is selected from high molecular polymers; Or a miscible material of a high molecular polymer and the degradable plastic.

4. The biodegradable grease for large-diameter multi-layered steel wire rope according to claim 3, characterized in that: The high molecular polymer is selected from polyisobutylene and / or polymethacrylate.

5. The biodegradable grease for large-diameter multi-layered steel wire rope according to claim 1, characterized in that: The extreme pressure anti-wear agent is sulphurized olefin cottonseed oil.

6. The biodegradable grease for large-diameter multi-layered steel wire rope according to claim 1, characterized in that: The rust inhibitor is an ester rust inhibitor.

7. The biodegradable grease for large-diameter multi-layered steel wire rope according to claim 6, characterized in that: The ester rust inhibitor is selected from one or more of pentaerythritol monooleate, sorbitan monooleate and / or polyol ester.

8. A method for preparing the biodegradable grease for large-diameter multi-layer steel wire rope according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. heating the degradable plastic under stirring; S2. Cooling and shearing the heated biodegradable plastic in S1 to disperse it, and adding adhesive, extreme pressure anti-wear agent and rust inhibitor in sequence under stirring, and grinding to obtain grease.

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