Method for preparing graphite oxide/macromolecular water-based cold rolling lubricating additive

Abstract

The invention discloses a method for preparing a graphite oxide / macromolecular water-based cold rolling lubricating additive, and relates to a method for preparing a graphite oxide-based lubricating additive. The method solves the problems that the conventional cold rolling liquid has short service life, is easy to settle and break emulsion and has poor lubricating performance, poor anti-rust level, high viscosity and high residual carbon quantity and residual iron quantity. The method comprises the following steps of: adding graphite oxide into mixed solution of thionyl chloride and methylbenzene, performing reflux reaction to obtain graphite acetyl chloride, then adding the graphite acetyl chloride and water-soluble macromolecules into N,N-dimethyl formamide to react, drying the reaction system, dispersing the dried product into water, then adding ethanol to obtain sediment, and drying the sediment. The molecular structure of the water-based cold rolling lubricating additive has flexible polymer molecular chains, so the anti-friction performance of the lubricating additive is improved; the lubricating additive forms stable solution in water, and the solution has low viscosity, is not easy to settle and has long service life; and the lubricating additive has good anti-rust level and low residual carbon quantity and residual iron quantity. Through the water-based cold rolling lubricating additive, the friction spot diameter of the base liquid is reduced by 26.2 percent.

Description

technical field

[0001] The invention relates to a preparation method of a graphite oxide-based lubricating additive. Background technique

[0002] In recent years, my country's steel consumption has grown rapidly and has become the world's largest steel market. Since China's annual steel output exceeded 100 million tons in 1996, it has become the world's largest steel producer for 14 consecutive years. In the production of steel, cold-rolled steel strip occupies a considerable proportion and is widely used in the fields of automobile industry, machinery manufacturing, hardware products, home decoration and so on. Although the output of cold-rolled steel strip in my country is high, the product structure is low and the ratio of high-quality steel is low, which cannot meet market demand. High value-added products such as cold-rolled thin plates, cold-rolled stainless steel sheets, and cold-rolled silicon steel sheets still rely heavily on imports. In the cold rolling indust...

Examples

specific Embodiment approach 1

[0014] Specific embodiment one: this embodiment is the preparation method of graphite oxide / polymer water-based lubricating additive for cold rolling, which is realized through the following steps: 1. Put graphite oxide into deionized water, ultrasonically disperse it for 30-60 minutes, and then put Add the graphite oxide suspension into the mixed solution of thionyl chloride and toluene, then under the protection of nitrogen and 50-100°C, reflux for 1-5 days, then centrifuge, discard the supernatant, and remove the precipitated product at 70 Vacuum drying at ~100°C for 12-48 hours to obtain acyl chloride graphite, wherein the ratio of the mass of graphite oxide to the volume of the mixed solution is 1g: 600-1000mL, and the volume ratio of thionyl chloride to toluene in the mixed solution is 1-2: 1; 2. Add the acyl chloride graphite and water-soluble polymer compound prepared in step 1 into N,N-dimethylformamide, then ultrasonically disperse for 2-5 hours, and then react at 80-...

specific Embodiment approach 2

[0018] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the graphite oxide described in step one is realized through the following steps: adding 5-50 g of dry graphite to the In the salt mixture, after mixing evenly, add 30-300g of potassium-containing strong oxidant under stirring, keep at 30-60°C for 4-12 hours, then add 400-4000mL of deionized water, keep at 60-80°C Continue at high temperature for 30 to 60 minutes, then add 500 to 5000 mL of deionized water and 30 to 300 mL of hydrogen peroxide with a mass concentration of 20% to 40%, stir and react for 10 to 30 minutes, then rinse and filter the reactant with deionized water, Until the pH value of the filtrate is 5-7, the product is dried in a vacuum oven at 40-80°C for 12-48 hours to obtain graphite oxide. Other steps and parameters are the same as those in Embodiment 1.

[0019] The transmission electron micrograph of the graphite oxide prepared by the present embodime...

specific Embodiment approach 3

[0020] Embodiment 3: This embodiment is different from Embodiment 2 in that the strong potassium-containing oxidant is potassium permanganate or potassium perchlorate. Other steps and parameters are the same as in the second embodiment.

technical field

[0001] The invention relates to a preparation method of a graphite oxide-based lubricating additive. Background technique

[0002] In recent years, my country's steel consumption has grown rapidly and has become the world's largest steel market. Since China's annual steel output exceeded 100 million tons in 1996, it has become the world's largest steel producer for 14 consecutive years. In the production of steel, cold-rolled steel strip occupies a considerable proportion and is widely used in the fields of automobile industry, machinery manufacturing, hardware products, home decoration and so on. Although the output of cold-rolled steel strip in my country is high, the product structure is low and the ratio of high-quality steel is low, which cannot meet market demand. High value-added products such as cold-rolled thin plates, cold-rolled stainless steel sheets, and cold-rolled silicon steel sheets still rely heavily on imports. In the cold rolling indust...

Examples

specific Embodiment approach 1

[0014] Specific embodiment one: this embodiment is the preparation method of graphite oxide / polymer water-based lubricating additive for cold rolling, which is realized through the following steps: 1. Put graphite oxide into deionized water, ultrasonically disperse it for 30-60 minutes, and then put Add the graphite oxide suspension into the mixed solution of thionyl chloride and toluene, then under the protection of nitrogen and 50-100°C, reflux for 1-5 days, then centrifuge, discard the supernatant, and remove the precipitated product at 70 Vacuum drying at ~100°C for 12-48 hours to obtain acyl chloride graphite, wherein the ratio of the mass of graphite oxide to the volume of the mixed solution is 1g: 600-1000mL, and the volume ratio of thionyl chloride to toluene in the mixed solution is 1-2: 1; 2. Add the acyl chloride graphite and water-soluble polymer compound prepared in step 1 into N,N-dimethylformamide, then ultrasonically disperse for 2-5 hours, and then react at 80-...

specific Embodiment approach 2

[0018] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the graphite oxide described in step one is realized through the following steps: adding 5-50 g of dry graphite to the In the salt mixture, after mixing evenly, add 30-300g of potassium-containing strong oxidant under stirring, keep at 30-60°C for 4-12 hours, then add 400-4000mL of deionized water, keep at 60-80°C Continue at high temperature for 30 to 60 minutes, then add 500 to 5000 mL of deionized water and 30 to 300 mL of hydrogen peroxide with a mass concentration of 20% to 40%, stir and react for 10 to 30 minutes, then rinse and filter the reactant with deionized water, Until the pH value of the filtrate is 5-7, the product is dried in a vacuum oven at 40-80°C for 12-48 hours to obtain graphite oxide. Other steps and parameters are the same as those in Embodiment 1.

[0019] The transmission electron micrograph of the graphite oxide prepared by the present embodime...

specific Embodiment approach 3

[0020] Embodiment 3: This embodiment is different from Embodiment 2 in that the strong potassium-containing oxidant is potassium permanganate or potassium perchlorate. Other steps and parameters are the same as in the second embodiment.

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