A valve sealing grease cleaning agent composition, its preparation method and application

Abstract

The invention relates to a valve seal grease cleaning agent composition, which is composed of the following raw materials in parts by weight: 10 to 45 parts of solvent, 3 to 20 parts of cosolvent, 2 to 10 parts of acid compound neutralizing and removing agent, 1 to 5 parts of surfactant, 0.5 to 2 parts of penetrant, 0.01 to 2 parts of metal chelating agent, 0 to 3 parts of metal corrosion inhibitor and rust preventive, and 100 parts of isoparaffin. The cleaning agent has excellent penetration, emulsification, degreasing, cleaning, dispersion and anti-aggregation capabilities for valve seal grease under alkaline conditions, can effectively emulsify, dissolve and clean to remove residual grease on the surface of valve seals under normal temperature conditions, the metal chelating agent and the corrosion inhibitor and rust preventive act synergistically, has good rust resistance for cleaned steel valves, and can meet short-term rust resistance requirements; the cleaning agent has good compatibility with valve seal grease, and the valve seal grease can be directly applied to the surface of the cleaned valve seal.

Description

Technical Field

[0001] The invention belongs to the technical field of cleaning agents, and in particular relates to a valve sealing grease cleaning agent composition and a preparation method and application thereof. Background Art

[0002] Valves are one of the control components of fluid delivery systems and are widely used in oilfield mining, transportation and refining equipment, as well as petrochemical, chemical, natural gas and liquefied petroleum gas industries. In order to reduce the friction between the valve body and the plug sealing surface, sealing grease is generally used to lubricate the valve seat. After a period of use, the sealing grease will accumulate sediments in the valve, the valve sealing surface will wear, the grease will age and solidify, the grease will disperse and dissolve due to the infiltration of the conveying medium, and the pressure resistance and sealing of the valve will be reduced. These problems will make the valve difficult to operate and even cause equipment failure. Therefore, it is necessary to perform regular maintenance on the valve, clean and remove the grease with declining performance on the valve, and replace it with new sealing grease to ensure the normal use of the valve.

[0003] Valve sealing grease usually has good high temperature stability, sealing, adhesion, water resistance and extreme pressure and wear resistance. It can meet the lubrication and sealing requirements under harsh conditions such as high temperature, high pressure and high flow rate. It has stable physical and chemical properties and is very difficult to clean.

[0004] At present, domestic oil and gas field cementing companies generally use strong alkaline cleaning agents, light component solvent oil or diesel when cleaning valve sealing grease. Valve sealing grease is mainly composed of grease, and the oily component is generally mineral oil. Alkaline cleaning agents are not very effective in cleaning it, and there are more residues after cleaning; the thickeners in valve sealing grease are mostly inorganic materials such as high-purity mica powder and silica. At the same time, in order to improve the adhesion and sealing of the product, high molecular compounds such as polyisobutylene, polymethacrylate, polyethylene, polypropylene or ethylene-propylene copolymer are usually added to the formula as adhesives. This type of thickener and adhesive can resist acid and alkaline compounds. Therefore, alkaline solutions, solvents, and diesel are not very effective in cleaning it. At the same time, light component solvents and diesel cleaning agents are also hazardous chemicals, with characteristics such as volatility and flammability, which pose great risks and safety hazards to transportation, storage, construction personnel and the environment. Summary of the invention

[0005] In order to solve the above problems, the present invention discloses a valve seal grease cleaning agent and its preparation method and application. The cleaning agent can quickly remove grease, rust and accumulated dirt, is safe, environmentally friendly and efficient, has no residue on the surface of the valve seal after cleaning, and does not corrode the workpiece. The cleaning agent has good compatibility with the valve seal grease, and the valve seal grease can be directly applied to the surface of the valve seal after cleaning.

[0006] The technical solution of the present invention is as follows:

[0007] A valve seal grease cleaning agent composition, characterized in that it is composed of the following raw materials in parts by weight:

[0008] 10-45 parts of solvent, 3-20 parts of co-solvent, 2-10 parts of acidic compound neutralizing and removing agent, 1-5 parts of surfactant, 0.5-2 parts of penetrant, 0.01-2 parts of metal chelating agent, 0-3 parts of metal corrosion inhibitor, and isoparaffin to make up to 100 parts;

[0009] The solvent is a mixture of one or more of ethyl acetate, n-propyl acetate, and dipropylene glycol methyl ether acetate; ester solvents such as ethyl acetate, n-propyl acetate, and dipropylene glycol methyl ether acetate are selected as the main solvent of the valve sealing grease cleaning agent. Such solvents have the characteristics of strong dissolving power, moderate evaporation speed, and low toxicity, and can quickly dissolve the plug valve sealing grease and the dirt generated during its use.

[0010] The co-solvent is a mixture of one or more of ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, propylene glycol butyl ether, dipropylene glycol butyl ether, and tripropylene glycol butyl ether. The alcohol ether solvents such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, propylene glycol butyl ether, dipropylene glycol butyl ether, and tripropylene glycol butyl ether have two strong dissolving functional groups, namely, ether bonds and hydroxyl groups (or ester groups). The co-solvent is selected as the co-solvent of the valve sealing grease cleaning agent. The former is lipophilic and can dissolve hydrophobic compounds, and the latter is hydrophilic and can dissolve water-soluble compounds. The synergistic effect of the main solvent and the co-solvent can accelerate the dissolution of the grease remaining on the valve.

[0011] The acidic compound neutralizing and removing agent is a mixture of one or more of 2-amino-2-methyl-1-propanol, triisopropanolamine, and octadeceneamine. The addition of acidic compound neutralizing and removing agents such as 2-amino-2-methyl-1-propanol, triisopropanolamine, and octadeceneamine into the formula can effectively adjust the pH value of the cleaning solution. Under alkaline conditions, the cleaning effect of the cleaning agent is better. At the same time, octadeceneamine undergoes a saponification reaction with oil stains to generate a saponified product that is easily soluble in or dispersed in a solvent.

[0012] The surfactant is a mixture of one or more of fatty acid methyl ester sulfonate and oleic acid diethanolamide borate; the penetrant is a mixture of one or more of fatty amine polyoxyethylene ether and octanol polyoxyethylene ether phosphate; the fatty acid methyl ester sulfonate and oleic acid diethanolamide borate surfactants and the fatty amine polyoxyethylene ether and octanol polyoxyethylene ether phosphate penetrants introduced in the formula have excellent penetration, emulsification, degreasing, cleaning, dispersion and anti-aggregation capabilities under strong alkaline conditions.

[0013] The metal chelating agent is a mixture of one or more of ethylenediaminetetraacetic acid, aminotriacetic acid and diethylenetriaminepentaacetic acid; the metal corrosion inhibitor is a ferrous metal corrosion inhibitor, and its components are one or more of sodium tripolyphosphate, sodium hexametaphosphate and zinc gluconate; the metal chelating agents such as ethylenediaminetetraacetic acid, aminotriacetic acid and diethylenetriaminepentaacetic acid introduced into the formula can encapsulate the iron ions into the interior of the chelating agent through the strong binding effect between the chelating agent molecules and metal ions, especially with iron ions, to become stable compounds with larger molecular weight, and at the same time synergistically act with corrosion inhibitors such as sodium hexametaphosphate, sodium tripolyphosphate and zinc gluconate, so as to have a good rust prevention and corrosion inhibition effect on the cleaned steel valves.

[0014] The isoparaffin distillation range is 185-250° C. The isoparaffin is a high-purity synthetic isoparaffin with a very stable structure, low surface tension, excellent wettability and surface extensibility. At the same time, the aromatic concentration is ultra-low and basically odorless, which enhances the user's comfort and significantly reduces the risk of contact with aromatic products.

[0015] Preferably, the solvent is composed of ethyl acetate or n-propyl acetate and dipropylene glycol methyl ether acetate mixed in a ratio of 1:1.5 to 1:3, and the content is 15 to 40 parts.

[0016] Preferably, the co-solvent is composed of six ether compounds as claimed in claim 1 mixed in a ratio of 2:1 to 1:3, with a content of 5 to 20 parts; or is composed of ethylene glycol monobutyl ether and tripropylene glycol butyl ether mixed in a ratio of 1:1, with a content of 5 to 20 parts.

[0017] Preferably, the acidic compound neutralizing and removing agent is composed of 2-amino-2-methyl-1-propanol and octadeceneamine mixed in a ratio of 1:1 to 1:5, and the content is 2 to 8 parts.

[0018] Preferably, the surfactant is composed of fatty acid methyl ester sulfonate and oleic acid diethanolamide borate mixed in a ratio of 1:1 to 1:5, and the content is 1 to 5 parts.

[0019] Preferably, the penetrant is composed of aliphatic amine polyoxyethylene ether and octanol polyoxyethylene ether phosphate mixed in a ratio of 1:1 to 1:3, with a content of 0.5 to 1.5 parts.

[0020] Preferably, the metal chelating agent is composed of ethylenediaminetetraacetic acid, aminotriacetic acid and diethylenetriaminepentaacetic acid in a ratio of 3:1:1 to 5:1:2, and the content is 0.01 to 2 parts.

[0021] Preferably, the metal corrosion inhibitor and rust preventer is composed of sodium tripolyphosphate, sodium hexametaphosphate and zinc gluconate mixed in a ratio of 3:3:1 to 5:3:1, and the content is 0.5 to 3 parts.

[0022] Furthermore, the preparation method of the valve seal grease cleaning agent comprises the following steps:

[0023] S1. Prepare the materials required for the preparation of valve seal grease cleaning agent in proportion;

[0024] S2, adding the solvent, co-solvent and isomeric alkanolamine into a stirred tank, and starting stirring;

[0025] S3, add the acidic compound neutralizing and removing agent to the stirred tank, and stir at room temperature for 20 to 60 minutes until it is completely dissolved;

[0026] S4. Add surfactant, penetrant, metal chelating agent and metal corrosion inhibitor into the stirring tank in sequence, stir at room temperature for 20 to 40 minutes until the mixture is evenly mixed, and the valve sealing grease cleaning agent is obtained.

[0027] Furthermore, the valve seal grease cleaning agent is used in the cleaning of plug valves, and the workpiece cleaned with the cleaning agent can be directly dipped in anti-rust oil or coated with grease.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The cleaning agent of the present invention has a strong dissolving and cleaning effect on valve sealing grease base oil, polyisobutylene polymer adhesive and thickener mica powder and silica and other fillers, and can effectively dissolve the above substances and the dirt generated during their use at room temperature.

[0030] 2. The cleaning agent of the present invention is an organic solvent cleaning agent, which uses ester solvents and glycol ethers as main solvents and auxiliary solvents, and is matched with high-purity isoparaffins. It has good safety and is harmless to human body and environment. It is a safe and environmentally friendly cleaning agent. It can be cleaned by spraying, soaking, scrubbing, ultrasonic and other methods.

[0031] 3. The cleaning agent of the present invention contains an alkaline acid compound neutralizing remover and a fatty amine polyoxyethylene ether and an octanol polyoxyethylene ether phosphate penetrant. The cleaning effect of the cleaning agent is better under alkaline conditions, and the substances after cleaning are not easy to aggregate. Under the synergistic effect of the metal chelating agent and the corrosion inhibitor, the cleaning agent has a certain rust resistance, and the cleaning agent has good compatibility with rust-proof oil or grease. The workpiece after cleaning can be directly dipped in rust-proof oil or smeared with grease. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Comparative test of the grease removal ability of the cleaning agents prepared in Examples 1-4 and Comparative Examples 1-4;

[0033] Figure 2 Comparison of the stable pressure and no leakage time of Examples 1-4 and Comparative Examples 1-4 before and after cleaning under 70Mpa pressure test;

[0034] Figure 3 Comparison of the stable pressure and no leakage time of Examples 1-4 and Comparative Examples 1-4 before and after cleaning under a 100Mpa pressure test;

[0035] Figure 4 The valve plate of the flat valve is not cleaned;

[0036] Figure 5 The valve plate elevation of the flat valve is not cleaned;

[0037] Figure 6 This is the effect after cleaning the side of the valve plate;

[0038] Figure 7 This is the effect after cleaning the valve plate sealing surface;

[0039] Figure 8 This is the effect after cleaning the valve plate facade. DETAILED DESCRIPTION

[0040] A valve sealing grease cleaning agent, the components and weight proportions of which are:

[0041] 10-45 parts of solvent, 3-20 parts of co-solvent, 2-10 parts of acidic compound neutralizing and removing agent, 1-5 parts of surfactant, 0.5-2 parts of penetrant, 0.01-2 parts of metal chelating agent, 0-3 parts of metal corrosion inhibitor, and isoparaffin to make up to 100 parts;

[0042] The solvent is: a mixture of one or more of ethyl acetate, n-propyl acetate, and dipropylene glycol methyl ether acetate, with a content of 10 to 45 parts; the solvent is preferably composed of a mixture of ethyl acetate or n-propyl acetate and dipropylene glycol methyl ether acetate in a ratio of 1:1.5 to 1:3, with a content of 15 to 40 parts;

[0043] The cosolvent is a mixture of one or more of ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, propylene glycol butyl ether, dipropylene glycol butyl ether, and tripropylene glycol butyl ether, with a content of 3 to 20 parts; preferably, the cosolvent is composed of any six ether compounds mixed in a ratio of 2:1 to 1:3, with a content of 5 to 20 parts. Or it is composed of a mixture of ethylene glycol monobutyl ether and tripropylene glycol butyl ether in a ratio of 1:1, with a content of 5 to 20 parts;

[0044] The acidic compound neutralizing and removing agent is a mixture of one or more of 2-amino-2-methyl-1-propanol, triisopropanolamine, and octadeceneamine, with a content of 2 to 10 parts; preferably, the acidic compound neutralizing and removing agent is a mixture of 2-amino-2-methyl-1-propanol and octadeceneamine in a ratio of 1:1 to 1:5, with a content of 2 to 8 parts;

[0045] The surfactant is a mixture of one or more of fatty acid methyl ester sulfonate and oleic acid diethanolamide borate, with a content of 1 to 5 parts; preferably, the surfactant is a mixture of fatty acid methyl ester sulfonate and oleic acid diethanolamide borate in a ratio of 1:1 to 1:5, with a content of 1 to 5 parts;

[0046] The penetrant is a mixture of one or more of fatty amine polyoxyethylene ether and octanol polyoxyethylene ether phosphate, with a content of 0.5 to 2 parts; preferably, the penetrant is a mixture of fatty amine polyoxyethylene ether and octanol polyoxyethylene ether phosphate in a ratio of 1:1 to 1:3, with a content of 0.5 to 1.5 parts;

[0047] The metal chelating agent is one or more of ethylenediaminetetraacetic acid, aminotriacetic acid and diethylenetriaminepentaacetic acid, with a content of 0.01 to 2 parts; preferably, the metal chelating agent is composed of ethylenediaminetetraacetic acid, aminotriacetic acid and diethylenetriaminepentaacetic acid mixed in a ratio of 3:1:1 to 5:1:2, with a content of 0.01 to 2 parts;

[0048] The metal corrosion inhibitor is a ferrous metal corrosion inhibitor: the components are one or more of sodium tripolyphosphate, sodium hexametaphosphate and zinc gluconate, with a content of 0 to 3 parts; preferably, the metal corrosion inhibitor is composed of sodium tripolyphosphate, sodium hexametaphosphate and zinc gluconate mixed in a ratio of 3:3:1 to 5:3:1, with a content of 0.5 to 3 parts;

[0049] The isoparaffin: the content is to make up the whole formula to 100 parts; preferably, the distillation range of the isoparaffin is 185-250°C;

[0050] The preparation method of the valve seal grease cleaning agent as described above comprises the following steps:

[0051] S1. Prepare the materials required for the preparation of valve seal grease cleaning agent in proportion;

[0052] S2, adding the solvent, co-solvent and isomeric alkanolamine into a stirred tank, and starting stirring;

[0053] S3, add the acidic compound neutralizing and removing agent to the stirred tank, and stir at room temperature for 20 to 60 minutes until it is completely dissolved;

[0054] S4. Add surfactant, penetrant, metal chelating agent and metal corrosion inhibitor into the stirring tank in sequence, stir at room temperature for 20 to 40 minutes until the mixture is evenly mixed, and the valve sealing grease cleaning product is obtained.

[0055] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] The reagents or instruments used in the examples of the present invention without indicating the manufacturer are all conventional reagent products that can be obtained through commercial purchase.

[0057] Example 1

[0058] A valve seal grease cleaning agent, the total content is calculated based on 100 parts, and the proportion of each material is:

[0059] The solvent is composed of ethyl acetate and dipropylene glycol methyl ether acetate in a ratio of 1:1.5, with a content of 40 parts;

[0060] The cosolvent is composed of ethylene glycol monobutyl ether and tripropylene glycol butyl ether in a ratio of 2:1, with a content of 15 parts;

[0061] The acid compound neutralizing and removing agent is composed of 2-amino-2-methyl-1-propanol and octadeceneamine mixed in a ratio of 1:1, with a content of 8 parts;

[0062] The surfactant is composed of fatty acid methyl ester sulfonate and oleic acid diethanolamide borate in a ratio of 1:2.5, with a content of 3 parts;

[0063] The penetrant is composed of a mixture of fatty amine polyoxyethylene ether and octanol polyoxyethylene ether phosphate in a ratio of 1:1, with a content of 1.0 part;

[0064] The metal chelating agent is composed of ethylenediaminetetraacetic acid, aminotriacetic acid and diethylenetriaminepentaacetic acid in a ratio of 3:1:1, with a content of 0.5 parts;

[0065] The metal corrosion inhibitor is composed of sodium tripolyphosphate, sodium hexametaphosphate and zinc gluconate in a ratio of 3:3:1, with a content of 1.5 parts;

[0066] Isoparaffins are: isoparaffins with a distillation range of 185 to 250°C, and the content is to make up the whole formula to 100 parts;

[0067] Preparation method: first add solvent, co-solvent and isoparaffin to a stirring tank, stir evenly, then add acidic compound neutralizer and remover, stir at room temperature for 20 to 60 minutes until completely dissolved, then add surfactant, penetrant, metal chelating agent and metal corrosion inhibitor to the stirring tank in turn, stir at room temperature for 20 to 40 minutes until mixed evenly, and the valve sealing grease cleaning agent is obtained.

[0068] Example 2

[0069] A valve seal grease cleaning agent, the total content is calculated based on 100 parts, and the proportion of each material is:

[0070] The solvent is a mixture of n-propyl acetate and dipropylene glycol methyl ether acetate in a ratio of 1:2.5, with a content of 38 parts;

[0071] The cosolvent is a mixture of dipropylene glycol butyl ether and tripropylene glycol butyl ether in a ratio of 2:1, with a content of 20 parts;

[0072] The acid compound neutralizing and removing agent is composed of 2-amino-2-methyl-1-propanol and octadeceneamine mixed in a ratio of 1:1, with a content of 4.5 parts;

[0073] The surfactant is a mixture of fatty acid methyl ester sulfonate and oleic acid diethanolamide borate in a ratio of 1:3, with a content of 4.5 parts;

[0074] The penetrant is composed of a mixture of fatty amine polyoxyethylene ether and octanol polyoxyethylene ether phosphate in a ratio of 1:2, with a content of 1.5 parts;

[0075] The metal chelating agent is composed of ethylenediaminetetraacetic acid, aminotriacetic acid and diethylenetriaminepentaacetic acid in a ratio of 3:1:1, with a content of 1.5 parts;

[0076] The metal corrosion inhibitor is composed of sodium tripolyphosphate, sodium hexametaphosphate and zinc gluconate in a ratio of 3:3:1, with a content of 1.8 parts;

[0077] The distillation range of isoparaffins is 185-250°C, and the content is sufficient to make up the whole formula to 100 parts.

[0078] Preparation method: After preparing all the raw materials, the valve sealing grease cleaning agent can be prepared according to the preparation method of Example 1.

[0079] Example 3

[0080] A valve seal grease cleaning agent, the total content is calculated based on 100 parts, and the proportion of each material is:

[0081] The solvent is composed of 35 parts of n-propyl acetate and dipropylene glycol methyl ether acetate in a ratio of 1:3;

[0082] The cosolvent is composed of ethylene glycol monobutyl ether and tripropylene glycol butyl ether mixed in a ratio of 1:1, with a content of 20 parts;

[0083] The acid compound neutralizing and removing agent is composed of 2-amino-2-methyl-1-propanol and octadeceneamine mixed in a ratio of 1:3, with a content of 6 parts;

[0084] The surfactant is composed of fatty acid methyl ester sulfonate and oleic acid diethanolamide borate in a ratio of 1:2, with a content of 4 parts;

[0085] The penetrant is composed of a mixture of fatty amine polyoxyethylene ether and octanol polyoxyethylene ether phosphate in a ratio of 1:2, with a content of 1.5 parts;

[0086] The metal chelating agent is composed of ethylenediaminetetraacetic acid, aminotriacetic acid and diethylenetriaminepentaacetic acid in a ratio of 3:2:2, and the content is 1.0 part;

[0087] The metal corrosion inhibitor is composed of sodium tripolyphosphate, sodium hexametaphosphate and zinc gluconate in a ratio of 3:3:1, with a content of 2.0 parts;

[0088] The distillation range of isoparaffins is 185-250°C, and the content is sufficient to make up the whole formula to 100 parts.

[0089] Preparation method: After preparing all the raw materials, the valve sealing grease cleaning agent can be prepared according to the preparation method of Example 1.

[0090] Example 4

[0091] A valve seal grease cleaning agent, the total content is calculated based on 100 parts, and the proportion of each material is:

[0092] The solvent is composed of ethyl acetate and dipropylene glycol methyl ether acetate in a ratio of 1:3, with a content of 37 parts;

[0093] The cosolvent is composed of ethylene glycol monobutyl ether and tripropylene glycol butyl ether mixed in a ratio of 1:1, with a content of 17 parts;

[0094] The acid compound neutralizing and removing agent is composed of triisopropanolamine and octadeceneamine mixed in a ratio of 1:4, with a content of 8 parts;

[0095] The surfactant is composed of fatty acid methyl ester sulfonate and oleic acid diethanolamide borate in a ratio of 1:4, with a content of 3.5 parts;

[0096] The penetrant is composed of a mixture of fatty amine polyoxyethylene ether and octanol polyoxyethylene ether phosphate in a ratio of 1:3, with a content of 1.3 parts;

[0097] The metal chelating agent is composed of ethylenediaminetetraacetic acid, aminotriacetic acid and diethylenetriaminepentaacetic acid in a ratio of 5:1:2, with a content of 1.8 parts;

[0098] The metal corrosion inhibitor is composed of sodium tripolyphosphate, sodium hexametaphosphate and zinc gluconate in a ratio of 5:3:1, with a content of 2.5 parts;

[0099] The distillation range of isoparaffins is 185-250°C, and the content is sufficient to make up the whole formula to 100 parts.

[0100] Preparation method: After preparing all the raw materials, the valve sealing grease cleaning agent can be prepared according to the preparation method of Example 1.

[0101] Comparative Example 1

[0102] A valve seal grease cleaning agent, the total content is calculated based on 100 parts, and the proportion of each material is:

[0103] The solvent is 35 parts of n-propyl acetate;

[0104] The cosolvent is composed of ethylene glycol monobutyl ether and tripropylene glycol butyl ether mixed in a ratio of 1:1, with a content of 20 parts;

[0105] The acid compound neutralizing and removing agent is composed of 2-amino-2-methyl-1-propanol and octadeceneamine mixed in a ratio of 1:3, with a content of 6 parts;

[0106] The surfactant is composed of fatty acid methyl ester sulfonate and oleic acid diethanolamide borate in a ratio of 1:2, with a content of 4 parts;

[0107] The penetrant is composed of a mixture of fatty amine polyoxyethylene ether and octanol polyoxyethylene ether phosphate in a ratio of 1:2, with a content of 1.5 parts;

[0108] The metal chelating agent is composed of ethylenediaminetetraacetic acid, aminotriacetic acid and diethylenetriaminepentaacetic acid in a ratio of 3:2:2, and the content is 1.0 part;

[0109] The metal corrosion inhibitor is composed of sodium tripolyphosphate, sodium hexametaphosphate and zinc gluconate in a ratio of 3:3:1, with a content of 2.0 parts;

[0110] The distillation range of isoparaffins is 185-250°C, and the content is sufficient to make up the whole formula to 100 parts.

[0111] Preparation method: After preparing all the raw materials, the valve sealing grease cleaning agent can be prepared according to the preparation method of Example 1.

[0112] Compared with Example 3, the solvent in Comparative Example 1 only contains n-propyl acetate and does not contain dipropylene glycol methyl ether acetate.

[0113] Comparative Example 2

[0114] A valve seal grease cleaning agent, the total content is calculated based on 100 parts, and the proportion of each material is:

[0115] The solvent is composed of 35 parts of n-propyl acetate and dipropylene glycol methyl ether acetate in a ratio of 1:3;

[0116] The cosolvent is ethylene glycol monobutyl ether, the content is 20 parts;

[0117] The acid compound neutralizing and removing agent is composed of 2-amino-2-methyl-1-propanol and octadeceneamine mixed in a ratio of 1:3, with a content of 6 parts;

[0118] The surfactant is composed of fatty acid methyl ester sulfonate and oleic acid diethanolamide borate in a ratio of 1:2, with a content of 4 parts;

[0119] The penetrant is composed of a mixture of fatty amine polyoxyethylene ether and octanol polyoxyethylene ether phosphate in a ratio of 1:2, with a content of 1.5 parts;

[0120] The metal chelating agent is composed of ethylenediaminetetraacetic acid, aminotriacetic acid and diethylenetriaminepentaacetic acid in a ratio of 3:2:2, and the content is 1.0 part;

[0121] The metal corrosion inhibitor is composed of sodium tripolyphosphate, sodium hexametaphosphate and zinc gluconate in a ratio of 3:3:1, with a content of 2.0 parts;

[0122] The distillation range of isoparaffins is 185-250°C, and the content is sufficient to make up the whole formula to 100 parts.

[0123] Preparation method: After preparing all the raw materials, the valve sealing grease cleaning agent can be prepared according to the preparation method of Example 1.

[0124] Compared with Example 3, the co-solvent in Comparative Example 2 is ethylene glycol monobutyl ether, and does not contain tripropylene glycol butyl ether.

[0125] Comparative Example 3

[0126] A valve seal grease cleaning agent, the total content is calculated based on 100 parts, and the proportion of each material is:

[0127] The solvent is composed of 35 parts of n-propyl acetate and dipropylene glycol methyl ether acetate in a ratio of 1:3;

[0128] The cosolvent is composed of ethylene glycol monobutyl ether and tripropylene glycol butyl ether mixed in a ratio of 1:1, with a content of 20 parts;

[0129] The acid compound neutralizing and removing agent is 2-amino-2-methyl-1-propanol, with a content of 6 parts;

[0130] The surfactant is composed of fatty acid methyl ester sulfonate and oleic acid diethanolamide borate in a ratio of 1:2, with a content of 4 parts;

[0131] The penetrant is composed of a mixture of fatty amine polyoxyethylene ether and octanol polyoxyethylene ether phosphate in a ratio of 1:2, with a content of 1.5 parts;

[0132] The metal chelating agent is composed of ethylenediaminetetraacetic acid, aminotriacetic acid and diethylenetriaminepentaacetic acid in a ratio of 3:2:2, and the content is 1.0 part;

[0133] The metal corrosion inhibitor is composed of sodium tripolyphosphate, sodium hexametaphosphate and zinc gluconate in a ratio of 3:3:1, with a content of 2.0 parts;

[0134] The distillation range of isoparaffins is 185-250°C, and the content is sufficient to make up the whole formula to 100 parts.

[0135] Preparation method: After preparing all the raw materials, the valve sealing grease cleaning agent can be prepared according to the preparation method of Example 1.

[0136] Compared with Example 3, the acidic compound neutralizing and removing agent in Comparative Example 3 is 2-amino-2-methyl-1-propanol, and does not contain octadeceneamine.

[0137] Comparative Example 4

[0138] The comparative example comes from another invention.

[0139] A railway train wheel axle bearing grease cleaning agent and its preparation method (CN110791392B), which is prepared from the following raw materials in weight percentage: a surfactant is a mixture of one or more of isomeric tridecanol polyoxyethylene polyoxypropylene ether, isomeric decanol polyoxyethylene polyoxypropylene ether, and lauryl alcohol polyoxyethylene polyoxypropylene ether, with a ratio of 10 to 25 parts; a cosolvent is one of n-butanol, 3-methoxy-3-methyl-1-butanol, diethylene glycol butyl ether, and sodium dimethylbenzenesulfonate. One or more kinds, with a ratio of 3 to 8 parts; organic polycarboxylic acid is one or more of tricarboxylic acid, dodecanedioic acid, and capric acid, with a ratio of 0.1 to 5 parts; boric acid, with a ratio of 0 to 2 parts; alcohol amine is a mixture of monoethanolamine and 2-amino-2-methyl-1-propanol, with a ratio of 1 to 15 parts; non-ferrous metal corrosion inhibitor is a mixture of copper corrosion inhibitor and aluminum corrosion inhibitor, with a ratio of 0 to 3 parts; defoamer is an organosilicon type defoamer, with a ratio of 0.2 to 2 parts; distilled water is supplemented to 100 parts. The cleaning agent of the present invention has extremely strong emulsification for bearing grease, can effectively emulsify and dissolve grease under the condition of 40 to 80°C, no white spots remain on the surface of the workpiece after cleaning, no corrosion to the workpiece, has certain rust resistance, and can meet the short-term rust prevention requirements. The cleaning agent has good compatibility with anti-rust oil or grease, and the workpiece after cleaning can be directly dipped in anti-rust oil or grease.

[0140] This comparative example was prepared using the method of Example 3 in the above document.

[0141] The patent application of the present invention is essentially different from the above patent publication. The reference document is a water-based cleaning agent which is essentially different from the organic solvent cleaning agent of the present invention. And according to the description, it contains organic polycarboxylic acid and boric acid, which belongs to an acidic formula system, which is completely different from the alkaline formula system used in the application of the present invention.

[0142] Test Example 1

[0143] Basic physical and chemical properties test.

[0144] The cleaning agents prepared in Examples 1-4 were subjected to analytical tests as shown in Table 1, and the results are shown in Table 1.

[0145] Table 1: Analysis and test data of each sample against GB / T 35759-2017 metal cleaning agent

[0146]

[0147] It can be seen from the data in the table that the cleaning agent samples prepared in Examples 1-4 of the present invention all meet the requirements of national standards. The products of the present invention do not contain toxic and harmful substances such as heavy metals and sodium nitrite, are non-toxic products, and have good environmental protection and health properties.

[0148] Test Example 2

[0149] Grease removal capability comparison test

[0150] The cleaning agents prepared in Examples 1-4 and Comparative Examples 1-4 were tested.

[0151] According to the industry standard metal cleaning agent JB / T4323.1-1999, ultrasonic cleaning was performed for 5 minutes, and the grease removal rate was determined by weight method. The grease includes valve sealing grease base oil, polyisobutylene polymer adhesive and thickener mica powder and silica and other fillers.

[0152] (0.2-0.3mm)) was used as the evaluation test piece, and after being placed at room temperature for 1 week by applying grease, it was aged at 70℃ for 2h, ultrasonically cleaned for 5min, rinsed with distilled water, dried, and blown dry with a hair dryer. The dirt removal rate was determined by the residual weight method of the dirt on both sides of the stainless steel sheet, and the surface condition of the stainless steel sheet was evaluated. The results are shown in Table 2 and the attached Figure 1 shown.

[0153] Table 2 Comparative test of grease removal ability of cleaning agents

[0154] Grease removal rate (%) Surface condition of steel plate after cleaning Defoaming time, s Example 1 98.5 Smooth 26.3 Example 2 98.7 Smooth 25.1 Example 3 99.1 Smooth 26.2 Example 4 99.0 Smooth 25.5 Comparative Example 1 94.7 Smoother 28.7 Comparative Example 2 93.8 Smoother 32.1 Comparative Example 3 94.2 Smoother 29.6 Comparative Example 4 97.2 Smoother 27.8

[0155] From Table 2 and the attached Figure 1 It can be seen from the data that the cleaning agent of the present invention has a very strong dissolving and cleaning effect on valve sealing grease base oil, polyisobutylene polymer adhesive and thickener mica powder and silica and other fillers, and can effectively dissolve the above substances and the dirt generated during their use at room temperature.

[0156] Test Example 3

[0157] Comparison of pressure test results before and after valve cleaning

[0158] The valve sealing grease cleaning agent prepared in accordance with Examples 1-4 and Comparative Examples 1-4 was tested for cleaning on an API PR1 PSL3 PU plug valve of a cementing company in Southwest China. Before and after cleaning, the valve was tested for leakage by pressure testing to determine the cleaning and sealing effects. No treatment was performed before cleaning, and the valve was directly pressurized. After cleaning, Kunlun BTST 5124 plug sealing grease was used to fill the valve with grease by applying it. The valve core was rotated to allow the sealing grease to be fully adsorbed on the sealing surface, and then a pressure test was performed. The test results are shown in Table 3 and Attached Figure 2 and attached Figure 3 As shown:

[0159] Table 3 Comparison of pressure test results before and after valve cleaning

[0160]

[0161]

[0162] From the data in Table 3 and the attached Figure 2 and attached Figure 3 It can be seen from the data that after the valve is fully cleaned using the sample embodiments 1-4 of the present invention, at a test pressure of 70Mpa, the valve after cleaning can maintain pressure for more than 80 minutes, which is more than 65 minutes longer than before cleaning, and is significantly longer than the comparative examples 1-4; at a test pressure of 100Mpa, the valve after cleaning can maintain pressure for 50 minutes, which is more than 40 minutes longer than before cleaning, and is also significantly longer than the comparative examples 1-4. Example 3 has been applied to the cleaning operation of the plug valve of a cementing company in the southwest. After cleaning, the plug valve has good sealing performance and the valve runs smoothly, achieving the expected effect.

[0163] Test Example 4

[0164] The valve seal grease cleaning agent prepared in Example 3 was used to simply soak and clean the flat valve plate coated with grease (Kunlun BTST 5124 plug seal grease). Specifically, at room temperature 25°C, the flat valve plate contaminated with grease was immersed in the cleaning agent prepared in Example 3, left to soak for 2 hours and then sprayed for 5 minutes. The condition before cleaning was as shown in the attached figure. Figure 4 and attached Figure 5 The effect after cleaning is shown in the attached Figure 6-8 shown.

[0165] From the above examples, it can be seen that the product of the present invention can thoroughly clean the grease on the valve under normal temperature conditions, and no residue remains on the surface of the workpiece after cleaning. The cleaning agent can be used by spraying, or by immersion, ultrasonic, manual scrubbing and other cleaning methods.

[0166] Furthermore, the product of the present invention does not contain toxic and harmful substances such as heavy metals and sodium nitrite, is a non-toxic product, and has good environmental protection and health properties.

[0167] The above are only a few preferred embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A valve seal grease cleaning agent composition, characterized in that: It is composed of the following raw materials in parts by weight: 15-40 parts of solvent, 5-20 parts of co-solvent, 2-8 parts of acid compound neutralizing and removing agent, 1-5 parts of surfactant, 0.5-1.5 parts of penetrant, 0.01-2 parts of metal chelating agent, 0.5-3 parts of metal corrosion inhibitor and rust preventer, and isoparaffin to make up to 100 parts; The isoparaffin distillation range is 185-250°C; The solvent is composed of ethyl acetate and dipropylene glycol methyl ether acetate or n-propyl acetate and dipropylene glycol methyl ether acetate in a ratio of 1:1.5 to 1:3; The cosolvent is composed of ethylene glycol monobutyl ether and tripropylene glycol butyl ether mixed in a ratio of 2:1; or ethylene glycol monobutyl ether and tripropylene glycol butyl ether mixed in a ratio of 1:1; the content is 5 to 20 parts; The acid compound neutralizing and removing agent is composed of 2-amino-2-methyl-1-propanol and octadeceneamine mixed in a ratio of 1:1 to 1:5; The surfactant is composed of fatty acid methyl ester sulfonate and oleic acid diethanolamide borate mixed in a ratio of 1:1 to 1:5; The penetrant is composed of a mixture of fatty amine polyoxyethylene ether and octanol polyoxyethylene ether phosphate in a ratio of 1:1 to 1:3; The metal chelating agent is composed of ethylenediaminetetraacetic acid, aminotriacetic acid and diethylenetriaminepentaacetic acid in a ratio of 3:1:1 to 5:1:2; The metal corrosion inhibitor and rust preventer is composed of sodium tripolyphosphate, sodium hexametaphosphate and zinc gluconate mixed in a ratio of 3:3:1 to 5:3:

1.

2. The method for preparing the valve seal grease cleaning agent composition according to claim 1, characterized in that: The following steps are involved: S1. Prepare the materials required for preparing the valve seal grease cleaning agent composition in proportion; S2, adding the solvent, co-solvent and isoparaffin into a stirred tank, and starting stirring; S3, add the acidic compound neutralizing and removing agent to the stirred tank, and stir at room temperature for 20 to 60 minutes until it is completely dissolved; S4. Add surfactant, penetrant, metal chelating agent and metal corrosion inhibitor into the stirring tank in sequence, stir at room temperature for 20 to 40 minutes until the mixture is uniformly mixed, and obtain the valve seal grease cleaning agent composition.

3. Use of the valve seal grease cleaning agent composition according to claim 2 in cleaning of plug valves, characterized in that: The workpiece cleaned with the cleaning agent composition can be directly dipped in anti-rust oil or coated with lubricating grease.

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