A high-temperature resistant chain rigging and its manufacturing process

Abstract

This invention relates to the field of rigging technology, specifically a high-temperature resistant chain rigging and its manufacturing process. To improve the service life and corrosion resistance of the chain rigging, this invention uses 17CrNiMo6 standard steel as the raw material for the chain in the chain rigging. 17CrNiMo6 standard steel is a low-carbon steel containing a relatively high amount of chromium, nickel, and molybdenum elements, which can effectively improve the corrosion resistance and high-temperature performance of the metal itself, allowing it to maintain sufficient working strength for a longer period of time. On this basis, this application also incorporates a high-temperature resistant sleeve on the outside of the chain, in which a modified polyurethane emulsion containing a large amount of fluorine and silicon elements is introduced. The use of fluorine and silicon elements can effectively improve the water vapor resistance and salt spray resistance of polyurethane, enhance the chemical stability of polyurethane, and thus reduce external corrosion of the chain. Furthermore, the introduction of fluorine and silicon elements can also effectively improve the high-temperature performance of polyurethane, preventing the deterioration and yellowing of polyurethane in high-temperature environments, and maintaining protective performance for a long time.

Description

Technical Field

[0001] This invention relates to the field of rigging technology, specifically a high-temperature resistant chain rigging and its manufacturing process. Background Technology

[0002] Chain slings are a type of sling formed by linking metal rings. They have a long service life and are suitable for various applications due to their flexible linkage. However, although most chain slings are currently made of various alloy steels with corrosion-resistant properties, they are still inevitably subject to corrosion in complex environments, such as high-temperature environments and humid seawater environments. This corrosion leads to a decrease in the strength and service life of the chain slings. Summary of the Invention

[0003] The purpose of this invention is to provide a high-temperature resistant chain rigging and its manufacturing process to solve the problems raised in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high-temperature resistant chain rigging, having the following technical features: the high-temperature resistant chain rigging is composed of a chain 1 and a high-temperature resistant sleeve 2 sleeved around the chain 1;

[0005] The chain 1 is formed by forging and rolling 17CrNiMo6 standard steel and then weaving it into a chain.

[0006] The method for preparing the high-temperature resistant sleeve 2 is as follows:

[0007] S1. Under nitrogen atmosphere protection, toluene diisocyanate and fluorosilicone modified diisocyanate are mixed, DMF is added, and the mixture is mixed evenly to obtain a diisocyanate mixture. The mixture is divided into two equal parts. Polytetrahydrofuran diol and dibutyltin dilaurate are added to one part of the diisocyanate mixture. The mixture is heated to 80-90℃, refluxed and stirred for 3-6 hours, and then cooled to room temperature. The remaining diisocyanate mixture is added to the mixture again, the mixture is heated to 80-95℃, and stirred for 1.5-2 hours. The mixture is then cooled to room temperature to obtain a modified polyurethane emulsion.

[0008] S2. After cleaning the glass fiber sleeve with deionized water and anhydrous ethanol 3-4 times respectively, dry it to constant weight, immerse the dried glass fiber sleeve in modified polyurethane emulsion for 30-45 seconds, take out the glass fiber sleeve and hang it to remove excess emulsion, and then dry it with hot air at 70-80℃ for 8 hours in the direction of treatment of the glass fiber sleeve opening to obtain high temperature resistant sleeve 2.

[0009] Furthermore, the preparation method of the fluorosilicone modified diisocyanate is as follows:

[0010] a. Under nitrogen atmosphere protection, anhydrous sodium sulfate is added to cyclohexane and left to stand for 12-24 hours. The anhydrous sodium sulfate is then removed by filtration. Diphenylsilane and Castar catalyst are added to the filtered cyclohexane and stirred until homogeneous. The mixture is then added dropwise to 4-envalonic acid, heated to 78-80℃, and refluxed and stirred for 2-12 hours. Excess solvent is removed by rotary evaporation to obtain the carboxysilane intermediate.

[0011] b. Disperse the carboxysilane intermediate in DMF, stir until evenly dispersed, add zinc chloride, and continue mixing for 2-3 minutes to obtain a carboxysilane intermediate dispersion for later use;

[0012] Add 2,2-bis(3-aminophenyl)hexafluoropropane to dimethyl sulfoxide, heat to 45-50℃, stir and disperse evenly, and under nitrogen atmosphere protection, add carboxysilane intermediate dispersion dropwise while stirring continuously. After the addition is completed, continue to heat to 95-115℃ and continue stirring for 2-8 hours. Then, remove excess solvent by rotary evaporation to obtain fluorosilicone modified intermediate.

[0013] c. Disperse the fluorosilicone modified intermediate in DMF, stir and mix evenly, then add it dropwise to a DMF solution containing hexamethylene diisocyanate. After the addition is complete, heat the reaction system to 65-80℃, stir and react for 12-24 hours, and then remove excess solvent by rotary evaporation to obtain fluorosilicone modified diisocyanate.

[0014] Furthermore, by weight, the modified polyurethane emulsion comprises toluene diisocyanate, fluorosilicone modified diisocyanate, polytetrahydrofuran diol, and dibutyltin dilaurate in a mass ratio of 1:(0.3-0.5):(5-5.5):(0.001-0.004).

[0015] Furthermore, the weight-average molecular weight of the polytetrahydrofuran diol is 1800-2300.

[0016] Furthermore, the modified polyurethane emulsion has a solid content of 14-23%.

[0017] Furthermore, in step a, the mass ratio of diphenylsilane, cassette catalyst, and 4-enpentonic acid is 1:(0.00005-0.0001):(0.9-1.1).

[0018] Furthermore, in step b, the mass ratio of the carboxysilane intermediate, zinc chloride, and 2,2-bis(3-aminophenyl)hexafluoropropane is 1:(0.0005-0.001):(1.6-1.8).

[0019] Furthermore, in step c, the mass ratio of the fluorosilicone modified intermediate to hexamethylene diisocyanate is 1:(0.3-0.33).

[0020] Furthermore, a method for preparing a high-temperature resistant chain rigging includes the following steps:

[0021] After heating and forging 17CrNiMo6 standard steel, the resulting bar is placed on an automatic chain weaving machine to form a chain. After standing and cooling to room temperature, chain 1 is obtained.

[0022] Prepare a high-temperature resistant sleeve 2, and insert the prepared chain 1 through the opening of the high-temperature resistant sleeve 2 into the high-temperature resistant sleeve 2 to obtain a high-temperature resistant chain rigging.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] In order to improve the service life and corrosion resistance of chain slings, this invention uses 17CrNiMo6 standard steel as the raw material for the chain in the chain sling. 17CrNiMo6 standard steel is a low carbon steel containing more chromium, nickel and molybdenum elements, which can effectively improve the corrosion resistance and high temperature performance of the metal itself, so that it can maintain sufficient working strength for a longer period of time.

[0025] Based on this, this application also attaches a high-temperature resistant sleeve to the outside of the chain. The main material of the high-temperature resistant sleeve prepared by this invention is a glass fiber tube with a modified polyurethane emulsion applied to its surface. Glass fiber itself has high mechanical properties, which can prevent external impurities from wearing and corroding the chain. In addition, the glass fiber sleeve can completely wrap and cover the chain, which can effectively prevent the chain from breaking and snapping under high loads, and prevent the chain from flying off and injuring people.

[0026] Furthermore, this invention introduces fluorosilicone-modified diisocyanate with abundant silicon and fluorine elements into the modified polyurethane emulsion. First, diphenylsilane is used as a raw material. Under the action of a caster catalyst, the silane-hydrogen bonds in diphenylsilane react with the olefin bonds in 4-envalonic acid to prepare a carboxylsilane intermediate containing terminal carboxyl groups. This intermediate is then reacted with fluorine-containing 2,2-bis(3-aminophenyl)hexafluoropropane, followed by a reaction with hexamethylene diisocyanate with terminal isocyanate groups, ultimately yielding a diisocyanate compound containing fluorosilicon elements. The fluorosilicon elements introduced in this process effectively improve the water vapor and salt spray resistance of polyurethane, enhance its chemical stability, and reduce external corrosion of the chain. Furthermore, the introduction of fluorosilicon elements effectively improves the high-temperature performance of polyurethane, preventing deterioration and yellowing under high-temperature conditions and maintaining its protective properties for a long time. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This is a structural diagram of the product of this invention;

[0029] In the diagram, 1 represents the chain and 2 represents the high-temperature resistant sleeve. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1. A method for preparing a high-temperature resistant chain rigging, comprising the following steps:

[0032] After heating and forging 17CrNiMo6 standard steel, the resulting bar is placed on an automatic chain weaving machine to form a chain. After standing and cooling to room temperature, chain 1 is obtained.

[0033] Prepare a high-temperature resistant sleeve 2, and insert the prepared chain 1 through the opening of the high-temperature resistant sleeve 2 into the high-temperature resistant sleeve 2 to obtain a high-temperature resistant chain rigging;

[0034] The method for preparing the high-temperature resistant sleeve 2 is as follows:

[0035] S1. Under nitrogen atmosphere protection, 1 part toluene diisocyanate and 0.3 parts fluorosilicone modified diisocyanate were mixed by weight, and DMF was added to the mixture. After mixing evenly, a diisocyanate mixture was obtained. The mixture was divided into two equal parts. 5.1 parts polytetrahydrofuran diol and 0.001 parts dibutyltin dilaurate were added to one part of the diisocyanate mixture. The mixture was heated to 85°C and stirred under reflux for 3.5 hours. After cooling to room temperature, the remaining diisocyanate mixture was added again. The mixture was heated to 90°C and stirred for another 1.5 hours. After cooling to room temperature, a modified polyurethane emulsion with a solid content of 17% was obtained.

[0036] The preparation method of the fluorosilicone modified diisocyanate is as follows:

[0037] a. Under nitrogen atmosphere protection, 5% anhydrous sodium sulfate was added to cyclohexane. After standing for 24 hours, the anhydrous sodium sulfate was removed by filtration. 1 part diphenylsilane and 0.00005 parts caster catalyst were added to the filtered cyclohexane by weight. After stirring and mixing evenly, the mixture was added dropwise to 0.9 parts 4-envalic acid. The temperature was raised to 80°C, and the mixture was refluxed and stirred for 8 hours. After removing the excess solvent by rotary evaporation, a carboxysilane intermediate was obtained.

[0038] b. By weight, disperse 1 part of carboxysilane intermediate into DMF, stir and disperse evenly, then add 0.001 part of zinc chloride, continue mixing for 2 minutes to obtain a carboxysilane intermediate dispersion for later use;

[0039] 1.6 parts of 2,2-bis(3-aminophenyl)hexafluoropropane were added to dimethyl sulfoxide, the temperature was raised to 45°C, and the mixture was stirred and dispersed evenly. Under a nitrogen atmosphere, a carboxylsilane intermediate dispersion was added dropwise while stirring continuously. After the addition was completed, the temperature was raised to 98°C and the reaction was continued for 8 hours. Excess solvent was removed by rotary evaporation to obtain the fluorosilane modified intermediate.

[0040] c. By weight, 1 part of the fluorosilicone modified intermediate was dispersed in DMF and stirred until homogeneous. Then, it was added dropwise to a DMF solution containing 0.3 parts of hexamethylene diisocyanate. After the addition was complete, the reaction system was heated to 75°C and stirred for 12 hours. The excess solvent was removed by rotary evaporation to obtain the fluorosilicone modified diisocyanate.

[0041] S2. After cleaning the glass fiber sleeve three times with deionized water and anhydrous ethanol respectively, dry it to constant weight, immerse the dried glass fiber sleeve in modified polyurethane emulsion for 30 seconds, take out the glass fiber sleeve and hang it to remove excess emulsion, and then dry it with hot air at 80°C for 8 hours in the direction of treatment of the glass fiber sleeve opening to obtain high temperature resistant sleeve 2.

[0042] Example 2. A method for preparing a high-temperature resistant chain rigging, comprising the following steps:

[0043] Compared with Example 1, this example increases the amount of fluorosilicone modified diisocyanate added in step S1, while the other steps remain unchanged;

[0044] The method for preparing the high-temperature resistant sleeve 2 is as follows:

[0045] S1. Under nitrogen atmosphere protection, 1 part toluene diisocyanate and 0.5 parts fluorosilicone modified diisocyanate were mixed by weight, and DMF was added to the mixture. After mixing evenly, a diisocyanate mixture was obtained. The mixture was divided into two equal parts. 5.1 parts polytetrahydrofuran diol and 0.001 parts dibutyltin dilaurate were added to one part of the diisocyanate mixture. The mixture was heated to 85°C and stirred under reflux for 3.5 hours. After cooling to room temperature, the remaining diisocyanate mixture was added again. The mixture was heated to 90°C and stirred for another 1.5 hours. After cooling to room temperature, a modified polyurethane emulsion with a solid content of 17% was obtained.

[0046] The preparation method of the fluorosilicone modified diisocyanate is as follows:

[0047] a. Under nitrogen atmosphere protection, 5% anhydrous sodium sulfate was added to cyclohexane. After standing for 24 hours, the anhydrous sodium sulfate was removed by filtration. 1 part diphenylsilane and 0.00005 parts caster catalyst were added to the filtered cyclohexane by weight. After stirring and mixing evenly, the mixture was added dropwise to 0.9 parts 4-envalic acid. The temperature was raised to 80°C, and the mixture was refluxed and stirred for 8 hours. After removing the excess solvent by rotary evaporation, a carboxysilane intermediate was obtained.

[0048] b. By weight, disperse 1 part of carboxysilane intermediate into DMF, stir and disperse evenly, then add 0.001 part of zinc chloride, continue mixing for 2 minutes to obtain a carboxysilane intermediate dispersion for later use;

[0049] 1.6 parts of 2,2-bis(3-aminophenyl)hexafluoropropane were added to dimethyl sulfoxide, the temperature was raised to 45°C, and the mixture was stirred and dispersed evenly. Under a nitrogen atmosphere, a carboxylsilane intermediate dispersion was added dropwise while stirring continuously. After the addition was completed, the temperature was raised to 98°C and the reaction was continued for 8 hours. Excess solvent was removed by rotary evaporation to obtain the fluorosilane modified intermediate.

[0050] c. By weight, 1 part of the fluorosilicone modified intermediate was dispersed in DMF and stirred until homogeneous. Then, it was added dropwise to a DMF solution containing 0.3 parts of hexamethylene diisocyanate. After the addition was complete, the reaction system was heated to 75°C and stirred for 12 hours. The excess solvent was removed by rotary evaporation to obtain the fluorosilicone modified diisocyanate.

[0051] S2. After cleaning the glass fiber sleeve three times with deionized water and anhydrous ethanol respectively, dry it to constant weight, immerse the dried glass fiber sleeve in modified polyurethane emulsion for 30 seconds, take out the glass fiber sleeve and hang it to remove excess emulsion, and then dry it with hot air at 80°C for 8 hours in the direction of treatment of the glass fiber sleeve opening to obtain high temperature resistant sleeve 2.

[0052] Example 3. A method for preparing a high-temperature resistant chain rigging, comprising the following steps:

[0053] Compared with Example 2, this example increases the amount of 4-enivalic acid added in step a, while the other steps remain unchanged;

[0054] The method for preparing the high-temperature resistant sleeve 2 is as follows:

[0055] S1. Under nitrogen atmosphere protection, 1 part toluene diisocyanate and 0.5 parts fluorosilicone modified diisocyanate were mixed by weight, and DMF was added to the mixture. After mixing evenly, a diisocyanate mixture was obtained. The mixture was divided into two equal parts. 5.1 parts polytetrahydrofuran diol and 0.001 parts dibutyltin dilaurate were added to one part of the diisocyanate mixture. The mixture was heated to 85°C and stirred under reflux for 3.5 hours. After cooling to room temperature, the remaining diisocyanate mixture was added again. The mixture was heated to 90°C and stirred for another 1.5 hours. After cooling to room temperature, a modified polyurethane emulsion with a solid content of 17% was obtained.

[0056] The preparation method of the fluorosilicone modified diisocyanate is as follows:

[0057] a. Under nitrogen atmosphere protection, 5% anhydrous sodium sulfate was added to cyclohexane. After standing for 24 hours, the anhydrous sodium sulfate was removed by filtration. 1 part diphenylsilane and 0.00005 part Castar catalyst were added to the filtered cyclohexane by weight. After stirring and mixing evenly, the mixture was added dropwise to 1.1 parts 4-envalonic acid. The temperature was raised to 80°C, and the mixture was refluxed and stirred for 8 hours. After removing the excess solvent by rotary evaporation, a carboxysilane intermediate was obtained.

[0058] b. By weight, disperse 1 part of carboxysilane intermediate into DMF, stir and disperse evenly, then add 0.001 part of zinc chloride, continue mixing for 2 minutes to obtain a carboxysilane intermediate dispersion for later use;

[0059] 1.6 parts of 2,2-bis(3-aminophenyl)hexafluoropropane were added to dimethyl sulfoxide, the temperature was raised to 45°C, and the mixture was stirred and dispersed evenly. Under a nitrogen atmosphere, a carboxylsilane intermediate dispersion was added dropwise while stirring continuously. After the addition was completed, the temperature was raised to 98°C and the reaction was continued for 8 hours. Excess solvent was removed by rotary evaporation to obtain the fluorosilane modified intermediate.

[0060] c. By weight, 1 part of the fluorosilicone modified intermediate was dispersed in DMF and stirred until homogeneous. Then, it was added dropwise to a DMF solution containing 0.3 parts of hexamethylene diisocyanate. After the addition was complete, the reaction system was heated to 75°C and stirred for 12 hours. The excess solvent was removed by rotary evaporation to obtain the fluorosilicone modified diisocyanate.

[0061] S2. After cleaning the glass fiber sleeve three times with deionized water and anhydrous ethanol respectively, dry it to constant weight, immerse the dried glass fiber sleeve in modified polyurethane emulsion for 30 seconds, take out the glass fiber sleeve and hang it to remove excess emulsion, and then dry it with hot air at 80°C for 8 hours in the direction of treatment of the glass fiber sleeve opening to obtain high temperature resistant sleeve 2.

[0062] Example 4. A method for preparing a high-temperature resistant chain rigging, comprising the following steps:

[0063] Compared with Example 3, this example increases the amount of 2,2-bis(3-aminophenyl)hexafluoropropane added in step b, while the other steps remain unchanged;

[0064] The method for preparing the high-temperature resistant sleeve 2 is as follows:

[0065] S1. Under nitrogen atmosphere protection, 1 part toluene diisocyanate and 0.5 parts fluorosilicone modified diisocyanate were mixed by weight, and DMF was added to the mixture. After mixing evenly, a diisocyanate mixture was obtained. The mixture was divided into two equal parts. 5.1 parts polytetrahydrofuran diol and 0.001 parts dibutyltin dilaurate were added to one part of the diisocyanate mixture. The mixture was heated to 85°C and stirred under reflux for 3.5 hours. After cooling to room temperature, the remaining diisocyanate mixture was added again. The mixture was heated to 90°C and stirred for another 1.5 hours. After cooling to room temperature, a modified polyurethane emulsion with a solid content of 17% was obtained.

[0066] The preparation method of the fluorosilicone modified diisocyanate is as follows:

[0067] a. Under nitrogen atmosphere protection, 5% anhydrous sodium sulfate was added to cyclohexane. After standing for 24 hours, the anhydrous sodium sulfate was removed by filtration. 1 part diphenylsilane and 0.00005 part Castar catalyst were added to the filtered cyclohexane by weight. After stirring and mixing evenly, the mixture was added dropwise to 1.1 parts 4-envalic acid. The temperature was raised to 80°C, and the mixture was refluxed and stirred for 8 hours. After removing the excess solvent by rotary evaporation, a carboxysilane intermediate was obtained.

[0068] b. By weight, disperse 1 part of carboxysilane intermediate into DMF, stir and disperse evenly, then add 0.001 part of zinc chloride, continue mixing for 2 minutes to obtain a carboxysilane intermediate dispersion for later use;

[0069] 1.8 parts of 2,2-bis(3-aminophenyl)hexafluoropropane were added to dimethyl sulfoxide, the temperature was raised to 45°C, and the mixture was stirred and dispersed evenly. Under a nitrogen atmosphere, a carboxyl silicon intermediate dispersion was added dropwise while stirring continuously. After the addition was completed, the temperature was raised to 98°C and the reaction was continued for 8 hours. Excess solvent was removed by rotary evaporation to obtain the fluorosilicone modified intermediate.

[0070] c. By weight, 1 part of the fluorosilicone modified intermediate was dispersed in DMF and stirred until homogeneous. Then, it was added dropwise to a DMF solution containing 0.3 parts of hexamethylene diisocyanate. After the addition was complete, the reaction system was heated to 75°C and stirred for 12 hours. The excess solvent was removed by rotary evaporation to obtain the fluorosilicone modified diisocyanate.

[0071] S2. After cleaning the glass fiber sleeve three times with deionized water and anhydrous ethanol respectively, dry it to constant weight, immerse the dried glass fiber sleeve in modified polyurethane emulsion for 30 seconds, take out the glass fiber sleeve and hang it to remove excess emulsion, and then dry it with hot air at 80°C for 8 hours in the direction of treatment of the glass fiber sleeve opening to obtain high temperature resistant sleeve 2.

[0072] Example 5. A method for preparing a high-temperature resistant chain rigging, comprising the following steps:

[0073] Compared with Example 4, this example increases the amount of hexamethylene diisocyanate added in step c, while the other steps remain unchanged;

[0074] The method for preparing the high-temperature resistant sleeve 2 is as follows:

[0075] S1. Under nitrogen atmosphere protection, 1 part toluene diisocyanate and 0.5 parts fluorosilicone modified diisocyanate were mixed by weight, and DMF was added to the mixture. After mixing evenly, a diisocyanate mixture was obtained. The mixture was divided into two equal parts. 5.1 parts polytetrahydrofuran diol and 0.001 parts dibutyltin dilaurate were added to one part of the diisocyanate mixture. The mixture was heated to 85°C and stirred under reflux for 3.5 hours. After cooling to room temperature, the remaining diisocyanate mixture was added again. The mixture was heated to 90°C and stirred for another 1.5 hours. After cooling to room temperature, a modified polyurethane emulsion with a solid content of 17% was obtained.

[0076] The preparation method of the fluorosilicone modified diisocyanate is as follows:

[0077] a. Under nitrogen atmosphere protection, 5% anhydrous sodium sulfate was added to cyclohexane. After standing for 24 hours, the anhydrous sodium sulfate was removed by filtration. 1 part diphenylsilane and 0.00005 part Castar catalyst were added to the filtered cyclohexane by weight. After stirring and mixing evenly, the mixture was added dropwise to 1.1 parts 4-envalic acid. The temperature was raised to 80°C, and the mixture was refluxed and stirred for 8 hours. After removing the excess solvent by rotary evaporation, a carboxysilane intermediate was obtained.

[0078] b. By weight, disperse 1 part of carboxysilane intermediate into DMF, stir and disperse evenly, then add 0.001 part of zinc chloride, continue mixing for 2 minutes to obtain a carboxysilane intermediate dispersion for later use;

[0079] 1.8 parts of 2,2-bis(3-aminophenyl)hexafluoropropane were added to dimethyl sulfoxide, the temperature was raised to 45°C, and the mixture was stirred and dispersed evenly. Under nitrogen atmosphere, a carboxyl silicon intermediate dispersion was added dropwise while stirring continuously. After the addition was completed, the temperature was raised to 98°C and the reaction was continued for 8 hours. Excess solvent was removed by rotary evaporation to obtain the fluorosilicone modified intermediate.

[0080] c. By weight, 1 part of the fluorosilicone modified intermediate was dispersed in DMF and stirred until homogeneous. Then, it was added dropwise to a DMF solution containing 0.33 parts of hexamethylene diisocyanate. After the addition was completed, the reaction system was heated to 75°C and stirred for 12 hours. The excess solvent was removed by rotary evaporation to obtain the fluorosilicone modified diisocyanate.

[0081] S2. After cleaning the glass fiber sleeve three times with deionized water and anhydrous ethanol respectively, dry it to constant weight, immerse the dried glass fiber sleeve in modified polyurethane emulsion for 30 seconds, take out the glass fiber sleeve and hang it to remove excess emulsion, and then dry it with hot air at 80°C for 8 hours in the direction of treatment of the glass fiber sleeve opening to obtain high temperature resistant sleeve 2.

[0082] Comparative Example 1. A method for preparing a high-temperature resistant chain rigging, comprising the following steps:

[0083] Compared to Example 1, this comparative example did not prepare a fluorosilicone-modified diisocyanate;

[0084] The method for preparing the high-temperature resistant sleeve 2 is as follows:

[0085] S1. Under nitrogen atmosphere protection, add 1 part by weight of toluene diisocyanate to DMF and mix well to obtain a diisocyanate mixture. Divide the mixture into two equal parts. Add 5.1 parts of polytetrahydrofuran diol and 0.001 parts of dibutyltin dilaurate to one part of the diisocyanate mixture. Heat to 85°C, reflux and stir for 3.5 hours. Cool to room temperature. Add the remaining diisocyanate mixture to the mixture. Heat to 90°C and stir for another 1.5 hours. Cool to room temperature to obtain a modified polyurethane emulsion with a solid content of 17%.

[0086] S2. After cleaning the glass fiber sleeve three times with deionized water and anhydrous ethanol respectively, dry it to constant weight, immerse the dried glass fiber sleeve in modified polyurethane emulsion for 30 seconds, take out the glass fiber sleeve and hang it to remove excess emulsion, and then dry it with hot air at 80°C for 8 hours in the direction of treatment of the glass fiber sleeve opening to obtain high temperature resistant sleeve 2.

[0087] Testing: Test samples were prepared using the high-temperature resistant sleeves 2 prepared in Examples 1-5 and Comparative Example 1;

[0088] High temperature resistance test: The high temperature resistant sleeve test samples prepared in Examples 1-5 and Comparative Example 1 were placed in environments of 200℃ and 500℃ for 24 hours, respectively, and their appearance and color changes were detected.

[0089] Thermal cycling bending performance: The high-temperature resistant sleeve test samples prepared in Examples 1-5 and Comparative Example 1 were placed in environments of -10℃ and 50℃ respectively and left to stand for 1 hour. After repeating the cycle 10 times, they were subjected to bending tests. The middle section of the tube was taken during bending, and the bending angle was 90°. After repeating the bending 10 times, the bending point was tested to see if any breakage occurred.

[0090] Water droplet contact angle test: The high-temperature resistant sleeves prepared in Examples 1-5 and Comparative Example 1 were tested using a water droplet contact angle measuring instrument;

[0091] Salt spray resistance tests were conducted on the high-temperature resistant sleeves prepared in Examples 1-5 and Comparative Example 1 according to GB / T 1771.

[0092] The test results are shown in the table below;

[0093]

[0094] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-temperature resistant chain rigging, characterized in that: The high-temperature resistant chain rigging consists of a chain (1) and a high-temperature resistant sleeve (2) sleeved around the chain (1); The chain (1) is formed by forging and rolling 17CrNiMo6 standard steel and then weaving it into a chain. The preparation method of the high-temperature resistant sleeve (2) is as follows: S1. Under nitrogen atmosphere protection, toluene diisocyanate and fluorosilicone modified diisocyanate are mixed, DMF is added, and the mixture is mixed evenly to obtain a diisocyanate mixture. The mixture is divided into two equal parts. Polytetrahydrofuran diol and dibutyltin dilaurate are added to one part of the diisocyanate mixture. The mixture is heated to 80-90℃, refluxed and stirred for 3-6 hours, and then cooled to room temperature. The remaining diisocyanate mixture is added to the mixture again, the mixture is heated to 80-95℃, and stirred for 1.5-2 hours. The mixture is then cooled to room temperature to obtain a modified polyurethane emulsion. S2. After cleaning the glass fiber sleeve with deionized water and anhydrous ethanol 3-4 times respectively, dry it to constant weight, immerse the dried glass fiber sleeve in modified polyurethane emulsion for 30-45 seconds, take out the glass fiber sleeve and hang it to remove excess emulsion, and then dry it with hot air at 70-80℃ for 8 hours in the treatment direction of the glass fiber sleeve opening to obtain a high temperature resistant sleeve (2). The preparation method of the fluorosilicone modified diisocyanate is as follows: a. Under nitrogen atmosphere protection, anhydrous sodium sulfate is added to cyclohexane and left to stand for 12-24 hours. The anhydrous sodium sulfate is then removed by filtration. Diphenylsilane and Castar catalyst are added to the filtered cyclohexane and stirred until homogeneous. The mixture is then added dropwise to 4-envalonic acid, heated to 78-80℃, and refluxed with stirring for 2-12 hours. Excess solvent is removed by rotary evaporation to obtain the carboxysilane intermediate. b. Disperse the carboxysilane intermediate in DMF, stir until evenly dispersed, add zinc chloride, and continue mixing for 2-3 minutes to obtain a carboxysilane intermediate dispersion for later use; Add 2,2-bis(3-aminophenyl)hexafluoropropane to dimethyl sulfoxide, heat to 45-50℃, stir and disperse evenly, and under nitrogen atmosphere protection, add carboxysilane intermediate dispersion dropwise while stirring continuously. After the addition is completed, continue to heat to 95-115℃ and continue stirring for 2-8 hours. Then, remove excess solvent by rotary evaporation to obtain fluorosilicone modified intermediate. c. Disperse the fluorosilicone modified intermediate in DMF, stir and mix evenly, then add it dropwise to a DMF solution containing hexamethylene diisocyanate. After the addition is complete, heat the reaction system to 65-80℃, stir and react for 12-24 hours, and then remove excess solvent by rotary evaporation to obtain fluorosilicone modified diisocyanate.

2. The high-temperature resistant chain rigging according to claim 1, characterized in that: The mass ratio of toluene diisocyanate, fluorosilicone-modified diisocyanate, polytetrahydrofuran diol, and dibutyltin dilaurate in the modified polyurethane emulsion is 1:(0.3-0.5):(5-5.5):(0.001-0.004).

3. The high-temperature resistant chain rigging according to claim 1, characterized in that: The weight-average molecular weight of the polytetrahydrofuran diol is 1800-2300.

4. The high-temperature resistant chain rigging according to claim 1, characterized in that: The modified polyurethane emulsion has a solid content of 14-23%.

5. A high-temperature resistant chain rigging according to claim 1, characterized in that: In step a, the mass ratio of diphenylsilane, cassiterite catalyst, and 4-enivalic acid is 1:(0.00005-0.0001):(0.9-1.1).

6. A high-temperature resistant chain rigging according to claim 1, characterized in that: In step b, the mass ratio of the carboxysilane intermediate, zinc chloride, and 2,2-bis(3-aminophenyl)hexafluoropropane is 1:(0.0005-0.001):(1.6-1.8).

7. A high-temperature resistant chain rigging according to claim 1, characterized in that: In step c, the mass ratio of the fluorosilicone modified intermediate to hexamethylene diisocyanate is 1:(0.3-0.33).

8. A method for preparing a high-temperature resistant chain rigging as described in any one of claims 1-7, characterized in that, Includes the following steps: After heating and forging 17CrNiMo6 standard steel, the resulting bar is placed on an automatic chain weaving machine to form a chain. After standing and cooling to room temperature, a chain (1) is obtained. Prepare a high-temperature resistant sleeve (2), and insert the prepared chain (1) through the opening of the high-temperature resistant sleeve (2) to obtain a high-temperature resistant chain rigging.

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