An insulating safety hook and a method for manufacturing the same, an insulating material

Abstract

The application relates to the technical field of safety hooks, and particularly discloses an insulating safety hook, a preparation method of the insulating safety hook and an insulating material. The insulating safety hook comprises a base material, an insulating layer and an outer layer which are sequentially arranged from inside to outside; and the preparation raw materials of the insulating layer comprise the following components in parts by weight: polybutylene terephthalate 19-26 parts; polyethylene terephthalate 17-23 parts; epoxy resin 22-28 parts; phenolic resin 16-27 parts; ceramic fiber 12-16 parts; nano-particles 6-13 parts; quartz powder 14-19 parts; flame retardant 7-11 parts; nylon 19-28 parts; solvent 23-44 parts; curing agent 10-13 parts; and chitosan-stearic alcohol heptanoate microcapsules 0-10 parts. The insulating safety hook is coated with the insulating layer on the surface of the metal base material, the metal base material guarantees the high strength of the safety hook, and the insulating layer endows the safety hook with the insulation and flame retardant properties, and the safety hook can be used in a live environment.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of safety hooks, in particular to an insulating safety hook and a preparation method thereof, and an insulating material. BACKGROUND

[0002] A safety hook, also called a "carabiner", is a commonly used connecting tool for connecting ropes, flat belts, anchors and equipment, and can be used in combination with safety belts, safety ropes and the like, and is applied to scenarios such as high-altitude operations.

[0003] Traditional safety hooks are generally made of forged steel or aluminum alloy and the like, but in some environments where static electricity needs to be prevented or where there is electricity, such as the power and petrochemical industries, if a metal product accidentally contacts a live wire, an electric shock hazard may occur, so the use of safety hooks in such special environments in the industry will have great safety risks, and operators are prone to electric shock accidents. SUMMARY

[0004] In order to improve the insulating performance of the safety hook, the application provides an insulating safety hook and a preparation method thereof, and an insulating material.

[0005] In a first aspect, the application provides an insulating safety hook, which adopts the following technical scheme:

[0006] An insulating safety hook comprises a base material, an insulating layer and an outer layer arranged in sequence from the inside to the outside.

[0007] The insulating layer is prepared from the following components in the following proportions by weight:

[0008] Polybutylene terephthalate 19-26 parts;

[0009] Polyethylene terephthalate 17-23 parts;

[0010] Epoxy resin 22-28 parts;

[0011] Phenolic resin 16-27 parts;

[0012] Ceramic fiber 12-16 parts;

[0013] Nanoparticles 6-13 parts;

[0014] Quartz powder 14-19 parts;

[0015] Flame retardant 7-11 parts;

[0016] Nylon 19-28 parts;

[0017] Solvent 23-44 parts;

[0018] Curing agent 10-13 parts;

[0019] Chitosan-stearyl heptanoate microcapsules 0-10 parts.

[0020] By adopting the above technical solution: the insulating layer is based on epoxy resin, phenolic resin, polyethylene terephthalate and solvent, and the compounding of each component complements each other to give the insulating material the basis of heat resistance, flame retardancy and electrical insulation properties; compounding nylon can improve the rigidity of the material, reduce creep, and make the molding shrinkage of the insulating layer small and the dimensional stability good, and significantly improve the material's arc breakdown resistance and insulation performance; compounding ceramic fiber can improve the material's antioxidant performance as well as high temperature resistance and corrosion resistance; compounding polybutylene terephthalate has good compatibility with the base material, further improving the insulation performance.

[0021] After the insulating layer is attached to the surface of the metal substrate, it can effectively prevent the generation of static electricity, isolate and resist the impact of voltage and current, and can be used in charged environments.

[0022] Optionally, the raw materials for preparing the insulating layer include the following components in parts by weight:

[0023] 19-26 parts of polybutylene terephthalate;

[0024] 17-23 parts of polyethylene terephthalate;

[0025] 22-28 parts of epoxy resin;

[0026] 16-27 parts of phenolic resin;

[0027] 12-16 parts of ceramic fiber;

[0028] 6-13 parts of nanoparticles;

[0029] 14-19 parts of quartz powder;

[0030] 7-11 parts of flame retardant;

[0031] 19-28 parts of nylon;

[0032] 23-44 parts of solvent;

[0033] 10-13 parts of curing agent;

[0034] 5-10 parts of chitosan-stearyl heptanoate microcapsules;

[0035] The preparation method of the chitosan-stearyl heptanoate microcapsules comprises the following steps: adding stearyl heptanoate to a chitosan solution, mixing, adjusting the pH to 5-6, adding a sodium tripolyphosphate solution, mixing, centrifuging to remove the supernatant, washing, and drying to obtain the microcapsules.

[0036] By adopting the technical scheme, the chitosan-stearyl heptanoate microcapsule is used in combination with the nylon to occupy part of the position of the insulation layer and play a filling effect; when the insulation layer is coated on the surface of the substrate, high-temperature hot pressing is needed, the hot pressing causes the stearyl heptanoate to be liquefied and the volume to be reduced, and the chitosan-stearyl heptanoate microcapsule shrinks, while the shrinkage change of the insulation layer under the support of the nylon is small and the insulation layer does not shrink with the shrinkage of the microcapsule, so that a cavity is generated around the chitosan-stearyl heptanoate microcapsule, a large number of insulation structures are formed in the insulation layer, and the insulation performance is significantly improved.

[0037] Optionally, in the chitosan-stearyl heptanoate microcapsule, the chitosan solution is obtained by dispersing chitosan in an aqueous acetic acid solution with a concentration of (0.40-0.50) wt%.

[0038] By adopting the technical scheme, when the concentration of the aqueous acetic acid solution is in the above range, the chitosan is fully dissolved and the coating effect of the stearyl heptanoate is good.

[0039] Optionally, in the chitosan-stearyl heptanoate microcapsule, the weight ratio of the added amount of the stearyl heptanoate to the chitosan is (0.7-0.9):1.

[0040] By adopting the technical scheme, when the added amount of the stearyl heptanoate is in the above range, the insulation effect of the insulation layer is better, and the insulation performance of the safety hook prepared is better.

[0041] Optionally, the substrate is a forged steel safety hook.

[0042] In a second aspect, the application provides a preparation method of an insulated safety hook, which adopts the following technical scheme:

[0043] The preparation method of the insulated safety hook comprises the following steps:

[0044] S1, first heat the epoxy resin, polybutylene terephthalate, phenolic resin and polyethylene terephthalate to 60-75℃, add a solvent and mix; add a flame retardant, nano silicon dioxide and a curing agent, mix, extrude, and obtain a mixture; sprinkle a first layer of quartz powder and chitosan-stearyl heptanoate microcapsule on the surface of the mixture, and then cover a layer of nylon; sprinkle a second layer of quartz powder, and then cover a layer of ceramic fiber to obtain an insulation layer;

[0045] S2, after cleaning the surface of the substrate, paste a glue film, paste the insulation layer on the surface of the glue film, hot-press and cool to obtain an insulated workpiece;

[0046] S3, spray an outer layer material on the surface of the insulated workpiece, dry and cool to obtain the insulated safety hook.

[0047] By adopting the technical scheme, the steps are less, the process is simple and efficient, and the industrialized scale preparation of the insulating safety hook is facilitated.

[0048] Optionally, in the step S1, the specific step of mixing before adding the flame retardant is:

[0049] First stage: mixing at a speed of 40-60 rpm for 0-10 min;

[0050] Second stage: mixing at a speed of 90-110 rpm for 11-30 min;

[0051] Third stage: mixing at a speed of 460-540 rpm for 5-15 min.

[0052] By adopting the technical scheme, the components are mixed more uniformly through gradient step-by-step mixing, and the performance of the prepared insulating layer is better.

[0053] Optionally, in the step S1, the thickness of the first layer of quartz powder is 0.8-2 mm.

[0054] Optionally, in the step S2, the hot pressing condition is: temperature 240-260℃, time 30-60 min.

[0055] In a third aspect, the application provides an insulating material, which adopts the following technical scheme:

[0056] An insulating material prepared from the raw materials for preparing the insulating layer.

[0057] By adopting the technical scheme, the compounding effect of the components is better, the insulating performance and the flame-retardant performance of the prepared insulating layer are both better, the insulating layer can be used for coating metal substrates such as safety hooks, and the insulating layer has a wide range of applications.

[0058] In summary, the application has the following beneficial effects:

[0059] 1. The application sets the insulating layer, takes epoxy resin, phenolic resin, polyethylene terephthalate and solvent as the base material, gives the insulating material the basis of heat resistance, flame retardance and electrical insulation performance; and further compounding nylon, ceramic fiber and butanediol, the components complement each other's strengths and weaknesses, and an insulating layer with better flame retardance and electrical insulation performance is prepared, which is coated on the surface of the metal substrate, and then a safety hook with better insulating performance is prepared, which can be applied in an electrified environment;

[0060] 2、The application adds chitosan-stearic alcohol heptanoate microcapsules in the insulating layer material, when the insulating layer is hot-pressed, the chitosan-stearic alcohol heptanoate microcapsules shrink to cause cavities, thereby forming a large number of insulating structures, and the insulating performance is more excellent; 3, The method has fewer steps, is simple and efficient; by setting the adhesive film to bond the base material and the insulating layer, the bonding strength of the two can reach 100% after cooling, so that the insulating effect can still be achieved after long-term use. DETAILED DESCRIPTION

[0061] The application will be further described in detail below in combination with examples, wherein the chitosan is from Shaanxi Rangan Biological Technology Co., Ltd., and the model number is 1011.

[0062] Preparation Example 1

[0063] A chitosan-stearic alcohol heptanoate microcapsule is prepared by the following steps:

[0064] 100g of chitosan is added to 120mL of 0.4wt% acetic acid aqueous solution, and stirred and mixed for 5h to obtain a chitosan solution;

[0065] 100g of sodium tripolyphosphate is added to 500mL of water, and stirred and mixed for 5h to obtain a sodium tripolyphosphate solution;

[0066] 50g of stearic alcohol heptanoate is added to the above chitosan solution, mixed for 1h, the pH is adjusted to 5 with 22wt% ammonia water, and then the above sodium tripolyphosphate solution is added, mixed for 30min, the supernatant is removed by centrifugation, washed with 500mL of water, and dried at 25℃ to obtain the product.

[0067] Preparation Example 2

[0068] A chitosan-stearic alcohol heptanoate microcapsule is prepared by the following steps:

[0069] 100g of chitosan is added to 120mL of 0.45wt% acetic acid aqueous solution, and stirred and mixed for 5h to obtain a chitosan solution;

[0070] 100g of sodium tripolyphosphate is added to 500mL of water, and stirred and mixed for 5h to obtain a sodium tripolyphosphate solution;

[0071] 50g of stearic alcohol heptanoate is added to the above chitosan solution, mixed for 1h, the pH is adjusted to 5.5 with 22wt% ammonia water, and then the above sodium tripolyphosphate solution is added, mixed for 30min, the supernatant is removed by centrifugation, washed with 500mL of water, and dried at 25℃ to obtain the product.

[0072] Preparation Example 3

[0073] Chitosan-stearyl heptanoate microcapsules are prepared by the following steps:

[0074] 100 g of chitosan was added to 120 mL of 0.5 wt% acetic acid aqueous solution and stirred for 5 h to obtain a chitosan solution;

[0075] 100 g of sodium tripolyphosphate was added to 500 mL of water and stirred for 5 h to obtain a sodium tripolyphosphate solution;

[0076] Add 50 g of stearyl heptanoate to the above chitosan solution and mix for 1 hour. Adjust the pH to 6 with 22 wt% ammonia water, then add the above sodium tripolyphosphate solution and mix for 30 minutes. Remove the supernatant by centrifugation, wash with 500 mL of water, and dry at 25°C to obtain the product.

[0077] Preparation Examples 4-6

[0078] A chitosan-stearyl heptanoate microcapsule, which differs from Preparation Example 2 in that the amount of stearyl heptanoate added is different, as follows:

[0079] Preparation Example 4: The weight ratio of stearyl heptanoate to chitosan is 0.7:1.

[0080] Preparation Example 5: The weight ratio of stearyl heptanoate to chitosan is 0.8:1.

[0081] Preparation Example 6: The weight ratio of stearyl heptanoate to chitosan is 0.9:1.

[0082] Example 1

[0083] An insulating safety hook comprises a base material, an insulating layer and an outer layer which are sequentially arranged from the inside to the outside;

[0084] Among them, the base material is a forged steel safety hook;

[0085] The components of the insulation layer and their corresponding weights are shown in Table 1;

[0086] The outer layer material is high temperature resistant nano coating, purchased from Shenzhen Qingyuan Nano New Materials Co., Ltd., model QY600.

[0087] The preparation method of the insulating safety hook is as follows:

[0088] S1. Preparation of insulating layer: First, heat epoxy resin, polybutylene terephthalate, phenolic resin, and polyethylene terephthalate to 60°C, add solvent, and stir and mix in a nitrogen atmosphere at the following speed:

[0089] Stage 1: Mix at 40 rpm for 10 min;

[0090] Second stage: mixing at 90 rpm for 30 min;

[0091] Third stage: mixing at 460 rpm for 15 min;

[0092] After the completion of the mixing, the flame retardant, nano-silica and curing agent are added, and the mixture is stirred and mixed at 200 rpm for 30 min, and then extruded to obtain the mixture, which is ready for use. The first layer of quartz powder (an amount of which is used to make the thickness of the layer 0.8 mm) and chitosan-stearyl alcohol heptanoate microcapsules are sprinkled on the surface of the mixture, and then a layer of nylon PA66 is laid on the top. The second layer of quartz powder (i.e. the remaining quartz powder) is sprinkled, and then a layer of ceramic fiber is laid on the top to obtain an insulation layer.

[0093] S2, a layer of rust remover WD-40 is sprayed on the surface of the substrate, and the rust remover is allowed to stay on the surface of the substrate for 10 to 15 minutes. Then, the rust remover is rubbed off from the surface of the substrate using a circular motion with a dust-free cloth to polish and clean the surface of the substrate at the same time. An adhesive film (purchased from Shenzhen Dongsheng Plastic Products Co., Ltd., model DS615) is pasted on the surface of the substrate to form an adhesive layer with a thickness of 0.1 mm. The insulation layer is pasted on the surface of the adhesive layer, and hot pressing is performed at 250°C for 45 min, and natural cooling is performed at 25°C for 24 h to obtain an insulated workpiece.

[0094] S3, an outer layer material is sprayed on the surface of the insulated workpiece, and the thickness is controlled to be 3 mm. Drying is performed at 50°C for 1 h, and natural cooling is performed at 25°C for 1 h to obtain an insulated safety hook. The overall thickness of the safety hook is 12 mm.

[0095] Example 2

[0096] An insulated safety hook, which differs from the example 1 in that the preparation method is as follows:

[0097] S1, preparation of the insulation layer: first, the epoxy resin, polybutylene terephthalate, phenolic resin and polyethylene terephthalate are warmed to 70°C, and then solvent is added. Mixing is performed at the following speed in a helium atmosphere:

[0098] First stage: mixing at 50 rpm for 5 min;

[0099] Second stage: mixing at 100 rpm for 20 min;

[0100] Third stage: mixing at 500 rpm for 10 min;

[0101] After the stirring and mixing is completed, the flame retardant and nano-silica are added, and the mixture is stirred and mixed at a speed of 200 rpm for 30 minutes, and extruded for use to obtain a mixture; a first layer of quartz powder (in an amount such that the layer thickness is 1.5 mm) and chitosan-stearyl heptanoate microcapsules are sprinkled on the surface of the mixture, and then a layer of nylon PA66 is laid; a second layer of quartz powder (i.e., the remaining quartz powder) is sprinkled, and then a layer of ceramic fiber is laid to obtain an insulating layer (the amounts of the components of the insulating layer are shown in Table 1);

[0102] S2. Spray a layer of rust remover WD-40 on the surface of the substrate and allow the rust remover to remain on the surface of the substrate for 10 to 15 minutes. Then, use a dust-free cloth to rub the rust remover from the surface of the substrate in a circular motion to simultaneously polish and clean the substrate surface. Attach an adhesive film (purchased from Shenzhen Dongsheng Plastic Products Co., Ltd., model DS615) to the surface of the substrate to form a 0.1 mm thick adhesive layer; attach an insulating layer to the surface of the adhesive layer, hot press at 250°C for 45 minutes, and naturally cool at 25°C for 24 hours to obtain an insulating workpiece;

[0103] S3. Spray the outer layer material on the surface of the insulating workpiece to a thickness of 3mm. Dry at 50℃ for 1 hour and cool naturally at 25℃ for 1 hour to obtain the insulating safety hook. The overall thickness of the safety hook is 12mm.

[0104] Example 3

[0105] An insulating safety hook, which differs from Example 1 in that its preparation method is:

[0106] S1. Preparation of insulating layer: First, heat epoxy resin, polybutylene terephthalate, phenolic resin, and polyethylene terephthalate to 75°C, add solvent, and stir and mix in a nitrogen atmosphere at the following speed:

[0107] Stage 1: Mix at 110 rpm for 11 min;

[0108] Stage 2: Mix at 540 rpm for 5 min.

[0109] After the stirring and mixing is completed, a flame retardant and nano-silica are added, and the mixture is stirred and mixed at a speed of 200 rpm for 30 minutes, and extruded for use to obtain a mixture; a first layer of quartz powder (in an amount such that the layer thickness is 2 mm) and chitosan-stearyl heptanoate microcapsules are sprinkled on the surface of the mixture, and then a layer of nylon PA66 is laid on top; a second layer of quartz powder (i.e., the remaining quartz powder) is sprinkled on top, and then a layer of ceramic fiber is laid on top to obtain an insulating layer (the amounts of the components of the insulating layer are shown in Table 1);

[0110] S2. Spray a layer of rust remover WD-40 on the surface of the substrate and allow the rust remover to remain on the surface of the substrate for 10 to 15 minutes. Then, use a dust-free cloth to rub the rust remover from the surface of the substrate in a circular motion to simultaneously polish and clean the substrate surface. Attach an adhesive film (purchased from Shenzhen Dongsheng Plastic Products Co., Ltd., model DS615) to the surface of the substrate to form a 0.1 mm thick adhesive layer; attach an insulating layer to the surface of the adhesive layer, hot press at 250°C for 45 minutes, and naturally cool at 25°C for 24 hours to obtain an insulating workpiece;

[0111] S3. Spray the outer layer material on the surface of the insulating workpiece to a thickness of 3mm. Dry at 50℃ for 1 hour and cool naturally at 25℃ for 1 hour to obtain the insulating safety hook. The overall thickness of the safety hook is 12mm.

[0112] Examples 4-6, Comparative Examples 1-2

[0113] An insulating safety hook differs from Example 1 in that the amounts of the components in the insulating layer are different, as shown in Table 1.

[0114] Table 1 Components and their weights (kg) in Examples 1-6 and Comparative Examples 1-2

[0115]

[0116]

[0117] Comparative Example 3

[0118] An insulating safety hook differs from Example 1 in that it does not contain an insulating layer.

[0119] Examples 7-11

[0120] An insulating safety hook is different from Example 4 in that the usage of chitosan-stearyl heptanoate microcapsules is as shown in Table 2, but the amount of chitosan-stearyl heptanoate microcapsules in the insulating layer remains unchanged.

[0121] Table 2 Usage of chitosan-stearyl heptanoate microcapsules in Examples 7-11

[0122] Example 7 8 9 10 11 Preparation of chitosan-stearic alcohol heptanoate microcapsules 2 3 4 5 6

[0123] Performance testing of insulation layer

[0124] The insulating layers in the examples and comparative examples were prepared into samples with a length of 127 mm, a width of 12.7 mm, and a maximum thickness of 12.7 mm. The following performance tests were performed, and the test results are recorded in Table 3.

[0125] 1. Flame retardant rating: in a non-ventilated test chamber. The upper end of the test sample (6.4 mm) is clamped with a clamp on the support, and the longitudinal axis of the test sample is kept vertical. The lower end of the test sample is 9.5 mm from the lamp nozzle and 305 mm from the surface of dry absorbent cotton. The Bunsen burner is lit and adjusted to produce a blue flame 19 mm high, and the Bunsen burner flame is placed under the lower end of the test sample, lit for 10 s, then removed (at least 152 mm away from the test sample), and the time of flaming combustion of the test sample is recorded. If the flame of the test sample is extinguished within 30 s after the Bunsen burner is removed, the Bunsen burner must be moved again under the test sample, the test sample is lit again for 10 s, then the Bunsen burner flame is removed again, and the afterflame and afterglow times of the test sample are recorded, and the sample is graded according to the following grading criteria:

[0126] V-0: After two 10-second combustion tests on the sample, the afterflame and afterglow are extinguished within 30 seconds, and the droplets cannot ignite the cotton.

[0127] V-1: After two 10-second combustion tests on the sample, the afterflame and afterglow are extinguished within 60 seconds, and the droplets cannot ignite the cotton.

[0128] Note: If the test sample has smoke droplets, let them fall onto the absorbent cotton 305 mm below the test sample, and see if they can ignite the absorbent cotton. If the absorbent cotton ignites, consider this factor when grading.

[0129] 2. Melt index: according to GB / T 3682.1-2018, record the melt mass flow rate, test conditions: 220℃ / 10kg.

[0130] Performance testing of insulating safety hooks

[0131] The insulating safety hooks prepared in the examples and comparative examples were subjected to the following performance tests, and the test results are recorded in Table 3.

[0132] 1. Voltage resistance: according to GB / T 1408.1-2016, record the breakdown voltage, the greater the breakdown voltage, the better the insulating performance of the safety hook.

[0133] 2. Tensile strength: according to GB / T 23469-2009, test conditions: 22KN / 3min.

[0134] Table 3 Performance test results

[0135]

[0136]

[0137] As shown in Table 3, the breakdown voltage of the safety hooks in Examples 1-6 can reach 9.0KV or more due to the attachment of the insulating layer on the surface of the substrate, while the safety hook in Comparative Example 3 is a conductor and thus has no insulation performance due to the absence of the insulating layer, indicating that the insulating layer significantly improves the insulation performance of the safety hook. Moreover, the flame-retardant grade of the insulating layer reaches V-0, and the flame-retardant effect is good, and the safety hook has good insulation and flame-retardant performance.

[0138] Comparative Examples 2, 3-5. Examples 3-5 differ from Example 2 in that the insulating layer contains chitosan-heptanoic acid stearyl ester microcapsules, and the breakdown voltage of the safety hooks prepared in Examples 3-5 is suddenly changed from 9.5KV in Example 2 to 12-13KV, and the insulation performance of the safety hook is significantly improved. The reason may be that:

[0139] During the hot-pressing of the insulating layer, the chitosan-heptanoic acid stearyl ester microcapsules shrink and form cavities, thereby forming a large number of insulating structures and improving the insulation performance of the insulating layer.

[0140] The specific embodiments are merely illustrative of the present application, and are not intended to limit the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. An insulating safety hook, characterized in that: It includes a base material, an insulating layer and an outer layer arranged in sequence from the inside to the outside; The raw materials for preparing the insulating layer include the following components in parts by weight: 19-26 parts of polybutylene terephthalate; 17-23 parts of polyethylene terephthalate; 22-28 parts of epoxy resin; 16-27 parts of phenolic resin; 12-16 parts of ceramic fiber; 6-13 parts of nanoparticles; 14-19 parts of quartz powder; 7-11 parts of flame retardant; 19-28 parts of nylon; 23-44 parts of solvent; 10-13 parts of curing agent; 5-10 parts of chitosan-stearyl heptanoate microcapsules; The preparation method of the chitosan-stearyl heptanoate microcapsules is as follows: adding stearyl heptanoate to a chitosan solution, mixing, adjusting the pH to 5-6, then adding a sodium tripolyphosphate solution, mixing, centrifuging to remove the supernatant, washing, and drying to obtain the microcapsules; The preparation method of the insulating layer is as follows: First, epoxy resin, polybutylene terephthalate, phenolic resin, and polyethylene terephthalate are heated to 60-75°C, a solvent is added, and the mixture is mixed; flame retardant, nano-silica, and a curing agent are added, mixed, and extruded to obtain a mixture; a first layer of quartz powder and chitosan-stearyl heptanoate microcapsules are sprinkled on the surface of the mixture, and then a layer of nylon is laid; then a second layer of quartz powder is sprinkled, and then a layer of ceramic fiber is laid to obtain an insulating layer.

2. The insulating safety hook according to claim 1, characterized in that: In the chitosan-stearyl heptanoate microcapsules, the chitosan solution is obtained by dispersing chitosan in an acetic acid aqueous solution with a concentration of (0.40-0.50) wt%.

3. The insulating safety hook according to claim 2, characterized in that: In the chitosan-stearyl heptanoate microcapsules, the weight ratio of stearyl heptanoate to chitosan is (0.7-0.9):

1.

4. The insulating safety hook according to claim 1, characterized in that: The base material is a forged steel safety hook.

5. A method for preparing an insulating safety hook according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. First, heat epoxy resin, polybutylene terephthalate, phenolic resin, and polyethylene terephthalate to 60-75°C, add solvent, and mix; add flame retardant, nano-silica, and curing agent, mix, and extrude to obtain a mixture; sprinkle a first layer of quartz powder and chitosan-stearyl heptanoate microcapsules on the surface of the mixture, and then lay a layer of nylon; then sprinkle a second layer of quartz powder, and then lay a layer of ceramic fiber to obtain an insulating layer; S2. After the substrate surface is cleaned, a film is pasted, and an insulating layer is pasted on the film surface, hot pressed, and cooled to obtain an insulating workpiece; S3. Spray the outer layer material on the surface of the insulating workpiece, dry and cool it to obtain the insulating safety hook.

6. The insulating safety hook according to claim 5, characterized in that: In step S1, the specific steps of mixing before adding the flame retardant are: Stage 1: Mix at a speed of 40-60 rpm for 0-10 min; Stage 2: Mix at a speed of 90-110 rpm for 11-30 min; Stage 3: Mix at a speed of 460-540 rpm for 5-15 minutes.

7. The insulating safety hook according to claim 5, characterized in that: In step S1, the thickness of the first layer of quartz powder is 0.8-2 mm.

8. The insulating safety hook according to claim 5, characterized in that: In step S2, the hot pressing conditions are: temperature 240-260° C., time 30-60 min.

9. An insulating material, characterized in that: The insulating layer is prepared from the raw material for preparing the insulating layer according to any one of claims 1 to 4.

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