Self-heating cold-proof butyronitrile gloves and preparation method thereof

Abstract

The invention discloses a self-heating cold-proof butyronitrile glove and a preparation method thereof, the self-heating cold-proof butyronitrile glove sequentially comprises a hand core inner layer, a self-heating middle layer and an outer protective layer from inside to outside, and the hand core inner layer is made of aluminum foil polyester fiber composite cloth; the heating middle layer comprises a self-heating material, a non-woven fabric bag wrapping the self-heating material and an oxygen barrier film arranged outside the non-woven fabric bag in a sealed mode, an easy-to-tear opening is formed in the position, at the wrist, of the oxygen barrier film, a pull piece is arranged on the easy-to-tear opening in a sealed and bonded mode, and the outer protection layer is made of a chemical defense butyronitrile layer. A plurality of air hole grooves are formed in the wrist portion of the chemical defense butyronitrile layer, and one end of the pull piece extends to the outer side of the outer protection layer through the air hole grooves. The glove has the advantages that through three innovations of material modification, structure optimization and reaction regulation, the problems of low-temperature hardening and no active heating of the traditional butyronitrile glove are solved, and the glove has protective property and comfort.

Description

Technical Field

[0001] The present invention relates to the technical field of cold-proof gloves preparation, and in particular to self-heating cold-proof nitrile gloves and a preparation method thereof. Background Art

[0002] While breakthroughs have been made in simple functional areas such as oil resistance, wear resistance, and anti-slip properties, existing gloves can be difficult to use for outdoor work in low-temperature environments. This extreme cold can lead to finger stiffness and frostbite, which can cause operators to make mistakes and fail to complete their work effectively.

[0003] Existing self-heating glove technology has the following defects:

[0004] (1) Uncontrollable temperature: The oxidation reaction of iron powder is extremely exothermic, and the temperature can reach 60-70°C, which can easily cause low-temperature burns;

[0005] (2) Short duration: Conventional heating is achieved by fitting gloves with warm packs, which only last for 2 to 4 hours and cannot meet the needs of long-term work.

[0006] (3) Poor integration: The heating pack needs to be attached to the gloves, which affects flexibility and is easy to fall off;

[0007] (4) Slow start-up: It takes 5 to 10 minutes to reach the effective temperature after being exposed to air. Summary of the Invention

[0008] The purpose of the present invention is to provide a self-heating cold-proof nitrile glove and a preparation method thereof. Through the triple innovation of material modification, structural optimization, and reaction regulation, the problems of traditional nitrile gloves hardening at low temperatures and lack of active heating are solved, and the gloves have both protection and comfort.

[0009] The above technical objectives of the present invention are achieved through the following technical solutions:

[0010] A self-heating cold-proof nitrile glove, characterized in that, from the inside to the outside, it comprises a palm inner layer, a self-heating middle layer and an outer protective layer, the material of the palm inner layer is an aluminum foil polyester fiber composite cloth, the heating middle layer comprises a self-heating material, a non-woven bag wrapped around the outside of the self-heating material, and an oxygen barrier film sealed on the outside of the non-woven bag, the oxygen barrier film is provided with an easy-tear opening at the wrist, and a pull tab is sealed and bonded on the easy-tear opening, the material of the outer protective layer is a chemical-proof nitrile layer, the chemical-proof nitrile layer is provided with multiple ventilation holes and grooves at the wrist, and one end of the pull tab extends to the outside of the outer protective layer through the ventilation holes and grooves.

[0011] Preferably, the thickness of the aluminum foil polyester fiber composite cloth is 0.1mm, and the aluminum foil polyester fiber composite cloth is stitched at the wrist to be provided with an elastic cuff.

[0012] Preferably, the self-heating material comprises 45-55wt% of reduced iron powder, 15-25wt% of vermiculite powder, 3-8wt% of sodium chloride, and 20-25wt% of pure water, the pure water carrier is medical absorbent cotton, and the mesh number of the reduced iron powder is 60-80.

[0013] Preferably, the preparation method of the self-heating intermediate layer is: the iron powder, vermiculite powder and sodium chloride are uniformly mixed in a dry glassware according to the mass percentage of the formula, then mixed with medical absorbent cotton containing pure water, then the uniformly mixed reaction powder is loaded into a glove-sized breathable non-woven bag, the total gram weight is controlled at 40g per bag, then sealed by an oxygen barrier film, the internal gas is emptied, and the pull tab is sealed and bonded to the easy-to-tear pull opening of the oxygen barrier film.

[0014] Preferably, the material of the outer protective layer comprises 100 parts of nitrile rubber, 8-15 parts of chlorinated paraffin, 2-8 parts of nano calcium carbonate, and 0.5-1.2 parts of sulfur.

[0015] Preferably, the mass percentage of acrylonitrile in the nitrile rubber is 30-35%.

[0016] Preferably, the preparation method of the outer protective layer is to pour the nitrile rubber, chlorinated paraffin, nano calcium carbonate and sulfur into an internal mixer according to the proportion, raise the temperature of the internal mixer to 120-150℃, control the mixing time to 12-20min, and pour out and cool to room temperature.

[0017] Preferably, the thickness of the outer protective layer is 0.4-0.6mm.

[0018] A self-heating cold-proof nitrile glove preparation method, characterized in that it comprises the following steps:

[0019] Cut the aluminum foil polyester fiber composite cloth according to the hand size template, complete the cutting of the front and back of the glove by tools, directly sew the front and back, add an elastic cuff at the wrist, and complete the production of the inner layer of the hand core;

[0020] Place the inner layer of the hand core on the desktop, and bond the inner side of the self-heating intermediate layer to the aluminum foil polyester fiber composite cloth;

[0021] Take the prepared outer protective layer and cut it into the required thickness, and open multiple ventilation holes at the wrist. Then, lay the outer protective layer on the outside of the inner layer of the palm, guide one end of the pull tab of the inner layer of the palm to the outside of the outer protective layer through the ventilation holes, and then place it on the heating plate of the pneumatic heat press machine. The outer protective layer is hot-pressed and laminated on the front and back of the gloves respectively, thus completing the preparation of self-heating cold-proof nitrile gloves.

[0022] Preferably, the operating temperature of the heating plate of the pneumatic heat press machine is 65-75° C., the operating pressure is 0.3-0.5 MPa, and the working time is 5-15 minutes.

[0023] In summary, the present invention has the following beneficial effects:

[0024] 1. The present invention reduces the glass transition temperature by adding chlorinated paraffin to the nitrile rubber, so that it can withstand lower temperatures. Nano-calcium carbonate is used to enhance the low-temperature tear resistance and improve the tear strength in low-temperature environments. The overall performance is good in cold resistance, and the rubber can work more stably and reliably in severe cold outdoor environments.

[0025] 2. The present invention adds vermiculite powder to the self-heating material. The vermiculite powder can expand and absorb heat when the heating temperature is greater than 45°C. The water between the vermiculite powder layers evaporates and absorbs excess heat, so the temperature is controlled not to be too high. The addition of sodium chloride can control and delay the reaction rate, achieve long-term slow heat release, extend the heating time, and control the heating temperature.

[0026] 3. The present invention sets the inner layer of the palm core as aluminum foil polyester fiber composite cloth. Through the fiber grid structure inside the aluminum foil polyester fiber composite cloth, it can achieve uniform heat distribution and have a good thermal insulation effect.

[0027] 4. When the gloves of the present invention need to be self-heating, they only need to tear the pull tab to open the easy-tear opening and expose it to the air. A large amount of air enters the heating middle layer through the breathable slots and the easy-tear opening. The oxygen in the air reacts with the iron powder and some water inside to form ferric oxide, which releases a large amount of heat, shortening the heating start time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the external overall structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the internal structure of the present invention. DETAILED DESCRIPTION

[0030] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. This embodiment does not constitute a limitation to the present invention.

[0031] like Figure 1 and2 The self-heating cold-proof nitrile gloves shown in the figure include, from the inside to the outside, a palm inner layer 1, a self-heating middle layer 2 and an outer protective layer 3. The material of the palm inner layer 1 is an aluminum foil polyester fiber composite cloth. The heating middle layer 2 includes a self-heating material 23, a non-woven bag 22 wrapped around the outside of the self-heating material, and an oxygen-barrier film 21 sealed on the outside of the non-woven bag. The oxygen-barrier film 21 is provided with an easy-tear opening at the wrist, and a pull tab 24 is sealed and bonded on the easy-tear opening. The material of the outer protective layer 3 is a chemical-proof nitrile layer. The chemical-proof nitrile layer 3 is provided with multiple ventilation holes 4 at the wrist. One end of the pull tab 24 extends to the outside of the outer protective layer 3 through the ventilation holes 4.

[0032] The thickness of the aluminum foil polyester fiber composite fabric is 0.1 mm, and the aluminum foil polyester fiber composite fabric is thicker than the wrist and is sewn with elastic cuffs.

[0033] The self-heating material 23 includes 45-55wt% of reduced iron powder, 15-25wt% of vermiculite powder, 3-8wt% of sodium chloride and 20-25wt% of pure water. The pure water carrier is medical absorbent cotton. The mesh number of the reduced iron powder is 60-80 mesh.

[0034] The preparation method of the self-heating intermediate layer 2 is as follows: iron powder, vermiculite powder and sodium chloride are dried and evenly mixed in a dry glass container according to the mass percentage of the formula, and then mixed with medical absorbent cotton containing pure water. The evenly mixed reaction powder is then put into a breathable non-woven bag of glove size, and the total gram weight is controlled at 40g per bag. After sealing with an oxygen barrier film, the internal gas is evacuated, and the pull tab 24 is sealed and bonded to the easy-tear opening of the oxygen barrier film.

[0035] The material of the outer protective layer 3 includes, by weight, 100 parts of nitrile rubber, 8-15 parts of chlorinated paraffin, 2-8 parts of nano-calcium carbonate and 0.5-1.2 parts of sulfur, wherein the mass proportion of acrylonitrile in the nitrile rubber is 30-35%.

[0036] The preparation method of the outer protective layer 3 is to pour nitrile rubber, chlorinated paraffin, nano calcium carbonate and sulfur into an internal mixer in proportion, raise the temperature of the internal mixer to 120-150°C, control the internal mixer time to 12-20 minutes, pour it out and cool it to room temperature. The thickness of the outer protective layer 3 is 0.4-0.6 mm.

[0037] A method for preparing self-heating cold-proof nitrile gloves comprises the following steps:

[0038] Cut the aluminum foil polyester fiber composite fabric into a pattern according to the hand size, use tools to complete the front and back of the glove, align the front and back and sew them directly, add elastic cuffs at the wrist to complete the production of the inner layer 1 of the hand core;

[0039] Place the inner layer 1 of the palm core flat on the table, and glue the inner side of the self-heating middle layer 2 onto the aluminum foil polyester fiber composite cloth;

[0040] Take the prepared outer protective layer 3 and cut it into the required thickness, and open a plurality of ventilation holes 4 at the wrist. Then, lay the outer protective layer 3 on the outside of the inner layer 1 of the palm, guide one end of the pull tab 24 of the inner layer 1 of the palm to the outside of the outer protective layer 3 through the ventilation holes 4, and then place it on the heating plate of the pneumatic heat press machine. The outer protective layer 3 is hot-pressed and laminated on the front and back of the gloves respectively, thus completing the preparation of the self-heating cold-proof nitrile gloves.

[0041] The working temperature of the heating plate of the pneumatic heat press machine is 65-75℃, the working pressure is 0.3-0.5Mpa, and the working time is 5-15min.

[0042] Example 1

[0043] The self-heating material 23 includes 50 wt% of reduced iron powder, 20 wt% of vermiculite powder, 5 wt% of sodium chloride and 25 wt% of pure water. The pure water carrier is medical absorbent cotton. The mesh number of the reduced iron powder is 60 mesh.

[0044] The material of the outer protective layer 3 includes, by weight, 100 parts of nitrile rubber, 15 parts of chlorinated paraffin, 2 parts of nano-calcium carbonate and 1.2 parts of sulfur, wherein the mass proportion of acrylonitrile in the nitrile rubber is 30%.

[0045] During the preparation of the external protective layer 3 , the temperature of the internal mixer was 120° C., the internal mixing time was controlled at 20 min, and the mixture was poured out and cooled to room temperature. The thickness of the external protective layer 3 was 0.6 mm.

[0046] The working temperature of the heating plate of the pneumatic heat press machine is 65℃, the working pressure is 0.5Mpa, and the working time is 15min.

[0047] Example 2

[0048] The difference from Example 1 is that: 55 wt% of reduced iron powder, 15 wt% of vermiculite powder, 8 wt% of sodium chloride and 22 wt% of pure water; the rest are the same.

[0049] Example 3

[0050] The difference from Example 1 is that the material of the outer protective layer 3 includes 100 parts of nitrile rubber, 10 parts of chlorinated paraffin, 5 parts of nano-calcium carbonate and 1.0 part of sulfur by weight, wherein the acrylonitrile mass proportion of the nitrile rubber is 35%, and the rest are the same.

[0051] Example 4

[0052] The difference from Example 1 is that during the preparation of the external protective layer 3, the internal mixer temperature is 150°C, the internal mixing time is controlled at 12 minutes, the product is poured out and cooled to room temperature, the thickness of the external protective layer 3 is 0.4 mm, and the rest are the same.

[0053] Example 5

[0054] The difference from Example 1 is that the working temperature of the heating plate of the pneumatic heat press machine is 75° C., the working pressure is 0.3 MPa, and the working time is 5 minutes. The rest are the same.

[0055] The self-heating cold-proof nitrile gloves prepared in the above embodiment were tested for room temperature heating start-up time, low temperature heating start-up time, room temperature steady-state temperature, low temperature steady-state temperature and low temperature folding resistance. The specific test methods and test results are as follows.

[0056] Normal temperature heating start time

[0057] Five packaged self-heating cold-resistant nitrile gloves were taken out and tested for the time required to reach 40°C. In a laboratory environment with a constant temperature (23°C) and constant humidity (50%), the self-heating cold-resistant nitrile gloves were removed from their packaging and opened. While bending their wrists to turn on the heating switch, a stopwatch was started to record the time. An infrared thermometer was used to measure the palm temperature of the gloves in real time. When the test temperature reached 40°C, the stopwatch was stopped and the time was recorded. The startup times of the five self-heating cold-resistant nitrile gloves were compared to see if they were stable. The specific test results are shown in Table 1 below.

[0058] Table 1

[0059] sample Ambient temperature and set temperature (℃) Startup time (s) Example 1 23.1℃→40℃ 36s Example 2 23.0℃→40℃ 37s Example 3 23.1℃→40℃ 36s Example 4 23.1℃→40℃ 34s Example 5 23.0℃→40℃ 34s

[0060] After synchronous comparison and verification, in an environment with a constant temperature of 23°C and a constant humidity (50%), the startup time for the temperature to rise from 23°C to 40°C after turning on the heating is 34s-37s.

[0061] Low temperature heating start time

[0062] Five pre-packaged self-heating cold-weather nitrile gloves were taken out for an experiment to measure the time required to reach 40°C. Five gloves were removed from a constant temperature (-20°C) freezer and placed in a laboratory environment with a constant temperature (23°C) and constant humidity (50%). The gloves were unpacked, and the wrists were bent to turn on the heating switch while a stopwatch was started to record the time. An infrared thermometer was used to measure the palm temperature of the gloves in real time. When the test temperature reached 40°C, the stopwatch was stopped and the time was recorded. The startup times of the five self-heating cold-weather nitrile gloves were compared to see if they were stable. The specific test results are shown in Table 2 below.

[0063] Table 2

[0064] sample Ambient temperature and set temperature (℃) Startup time (s) Example 1 -20.5℃→40℃ 88s Example 2 -20.3℃→40℃ 86s Example 3 -19.9℃→40℃ 85s Example 4 -20.1℃→40℃ 88s Example 5 -20.3℃→40℃ 85s

[0065] A simultaneous comparison and verification showed that in a constant temperature (23°C) and constant humidity (50%) experimental environment, the startup time from -20°C to 40°C after turning on the heater was 85s-88s. Furthermore, the startup time from -20°C to 40°C was approximately 50s longer than the startup time from 23°C to 40°C.

[0066] Normal steady-state temperature

[0067] Five packaged self-heating cold-proof nitrile gloves were taken out for an experiment to see how long they could maintain the temperature after reaching 40°C. Five gloves were taken out from a constant temperature (23°C) environment and placed in a constant temperature (23°C) and constant humidity (50%) laboratory environment. The packaging of the self-heating cold-proof nitrile gloves was opened, the wrist was bent to turn on the heating switch, and an infrared temperature tester was used to test the palm temperature of the gloves in real time. When the test temperature showed 40°C, a stopwatch was started to record the time. The temperature of the infrared temperature tester was set. When it was lower than 39°C, a warning light was turned on and the duration at this time was recorded. The steady-state temperature duration of the five self-heating cold-proof nitrile gloves was compared. The specific test is shown in Table 3 below.

[0068] Table 3

[0069]

[0070] After synchronous comparison and verification, in a constant temperature (23°C) and constant humidity (50%) experimental environment, after turning on the heating, the temperature rises from 23°C to 40°C and then maintains this temperature in a constant temperature (23°C) environment for a duration of between 7h30min and 7h40min.

[0071] Low temperature steady state temperature

[0072] Five packaged self-heating cold-proof nitrile gloves were taken out for an experiment to see how long they could maintain the temperature after reaching 40°C. Five gloves were taken out from a constant temperature (-20°C) laboratory freezer. In a constant temperature (23°C) and constant humidity (50%) laboratory environment, the packaging of the self-heating cold-proof nitrile gloves was opened, the wrist was bent to turn on the heating switch, and an infrared temperature tester was used to test the temperature of the palm of the glove in real time. When the test temperature showed 40°C, a stopwatch was started to record the time. Then, the five nitrile gloves that reached 40°C were placed in a constant temperature (-20°C) freezer environment, the temperature of the infrared temperature tester was set, and the warning light was on when it was lower than 39°C. The duration at this time was recorded, and the steady-state temperature duration of the five self-heating cold-proof nitrile gloves was compared. The specific test is shown in Table 4 below.

[0073] Table 4

[0074]

[0075]

[0076] A simultaneous comparison and verification showed that in a constant temperature (23°C) and constant humidity (50%) experimental environment, the temperature rose from -20°C to 40°C after heating was turned on and then maintained at that temperature in a constant temperature (-20°C) freezer environment for between 6 hours and 8 minutes and 6 hours and 12 minutes. Furthermore, the duration of steady state decreased in a constant low temperature environment.

[0077] Low temperature folding performance test

[0078] Ten packaged self-heating cold-proof nitrile gloves were taken out for a folding test in a low-temperature environment. Five gloves were taken out from a constant temperature (23°C) environment, and corresponding samples were cut according to the low-temperature folding standard. The samples were placed in a low-temperature folding tester, and the low-temperature environment was set to minus 20°C and minus 30°C. The low-temperature folding times of the five self-heating cold-proof nitrile gloves in the minus 20°C and minus 30°C environments were observed. The specific tests are shown in Tables 5 and 6 below.

[0079] Table 5

[0080] sample Sample ambient temperature (℃) Low temperature folding times (times) Example 1 -20℃ 145550 Example 2 -20℃ 143350 Example 3 -20℃ 146800 Example 4 -20℃ 144570 Example 5 -20℃ 145320

[0081] Table 6

[0082]

[0083]

[0084] After synchronous comparison and verification, in a low-temperature environment, the low-temperature folding times at minus 20°C is more than 140,000 times, and the low-temperature folding times at minus 30°C is more than 100,000 times. The lower the temperature, the fewer the low-temperature folding times, and the less folding-resistant it is.

[0085] The present invention reduces the glass transition temperature by adding chlorinated paraffin to the nitrile rubber, thereby being able to withstand lower temperatures. Nano-calcium carbonate is used to enhance the low-temperature tear resistance and improve the tear strength in a low-temperature environment. The rubber can play a good cold-resistant role as a whole, and can work more stably and reliably in a severely cold outdoor environment.

[0086] The present invention adds vermiculite powder to the self-heating material. The vermiculite powder can expand and absorb heat when the heating temperature is greater than 45°C. Water evaporates between the vermiculite powder layers to absorb excess heat, thereby controlling the temperature not to be too high. The addition of sodium chloride can control and delay the reaction rate, thereby achieving long-term slow heat release, extending the heating time, and controlling the heating temperature.

[0087] The present invention sets the inner layer 1 of the palm core as an aluminum foil polyester fiber composite cloth. Through the fiber grid structure inside the aluminum foil polyester fiber composite cloth, uniform heat distribution can be achieved, and at the same time, good thermal insulation effect is achieved.

[0088] When the gloves of the present invention need to be self-heating, it is only necessary to tear the pull tab 24 to open the easy-tear opening and expose it to the air. A large amount of air enters the heating middle layer through the vent slots 4 and the easy-tear opening. The oxygen in the air reacts with the iron powder and some water inside to form ferric oxide, which releases a large amount of heat, and the heating start-up time is shortened.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions should also be deemed to fall within the protection scope of the technical solution of the present invention.

Claims

1. A self-heating cold-proof nitrile glove, characterized in that: From the inside to the outside, it includes a palm core inner layer, a self-heating middle layer and an outer protective layer. The material of the palm core inner layer is an aluminum foil polyester fiber composite cloth. The heating middle layer includes a self-heating material, a non-woven bag wrapped around the outside of the self-heating material, and an oxygen barrier film sealed on the outside of the non-woven bag. The oxygen barrier film is provided with an easy-tear opening at the wrist, and a pull tab is sealed and bonded on the easy-tear opening. The material of the outer protective layer is a chemical-proof nitrile layer, and the chemical-proof nitrile layer is provided with multiple ventilation holes at the wrist. One end of the pull tab extends to the outside of the outer protective layer through the ventilation holes.

2. The self-heating cold-proof nitrile gloves according to claim 1, characterized in that: The thickness of the aluminum foil polyester fiber composite cloth is 0.1 mm, and the aluminum foil polyester fiber composite cloth is thicker than the wrist where an elastic cuff is sewn.

3. The self-heating cold-proof nitrile gloves according to claim 1, characterized in that: The self-heating material includes 45-55wt% of reduced iron powder, 15-25wt% of vermiculite powder, 3-8wt% of sodium chloride and 20-25wt% of pure water. The pure water carrier is medical absorbent cotton, and the mesh number of the reduced iron powder is 60-80 meshes.

4. The self-heating cold-proof nitrile gloves according to claim 3, characterized in that: The self-heating intermediate layer is prepared by drying and uniformly mixing iron powder, vermiculite powder, and sodium chloride in a dry glass container according to the mass percentage of the formula, and then mixing them with medical absorbent cotton containing pure water. The uniformly mixed reaction powder is then placed in a breathable non-woven bag the size of a glove, with the total weight of each bag controlled at 40g. After sealing with an oxygen barrier film, the internal gas is evacuated, and a pull tab is sealed and bonded to the easy-tear opening of the oxygen barrier film.

5. The self-heating cold-proof nitrile gloves according to claim 1, characterized in that: The material of the outer protective layer comprises, by weight, 100 parts of nitrile rubber, 8 to 15 parts of chlorinated paraffin, 2 to 8 parts of nano-calcium carbonate and 0.5 to 1.2 parts of sulfur.

6. The self-heating cold-proof nitrile gloves according to claim 5, characterized in that: The mass proportion of acrylonitrile in the nitrile rubber is 30-35%.

7. The self-heating cold-proof nitrile gloves according to claim 5, characterized in that: The preparation method of the external protective layer is as follows: pouring nitrile rubber, chlorinated paraffin, nano calcium carbonate and sulfur into an internal mixer in proportion, raising the temperature of the internal mixer to 120-150° C., controlling the internal mixer time to 12-20 minutes, pouring out and cooling to room temperature.

8. The self-heating cold-proof nitrile gloves according to claim 1, characterized in that: The thickness of the outer protective layer is 0.4 to 0.6 mm.

9. The method for preparing the self-heating cold-proof nitrile gloves according to any one of claims 1 to 8, characterized in that: The steps include: Cut the aluminum foil polyester fiber composite fabric into a pattern according to the hand size, use tools to complete the front and back of the gloves, align the front and back and sew them directly, add elastic cuffs at the wrist to complete the production of the inner layer of the hand core; Place the inner layer of the palm core flat on the table, and glue the inner side of the self-heating middle layer onto the aluminum foil polyester fiber composite cloth; Take the prepared outer protective layer and cut it into the required thickness, and open multiple ventilation holes at the wrist. Then, lay the outer protective layer on the outside of the inner layer of the palm, guide one end of the pull tab of the inner layer of the palm to the outside of the outer protective layer through the ventilation holes, and then place it on the heating plate of the pneumatic heat press machine. The outer protective layer is hot-pressed and laminated on the front and back of the gloves respectively, thus completing the preparation of self-heating cold-proof nitrile gloves.

10. The method for preparing the self-heating cold-proof nitrile gloves according to claim 9, characterized in that: The working temperature of the heating plate of the pneumatic heat press machine is 65-75° C., the working pressure is 0.3-0.5 MPa, and the working time is 5-15 minutes.

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