Preparation method of high reflectivity emergency thermal blanket based on PET aluminized film

Abstract

The application relates to the technical field of textiles, in particular to a preparation method of a high-reflectivity emergency thermal blanket based on a PET aluminized film. The high-reflectivity emergency thermal blanket based on the PET aluminized film comprises, from bottom to top, a thermal insulation layer, a first waterproof and breathable layer, a first moisture absorption layer, a second moisture absorption layer, a second waterproof and breathable layer and a high-reflectivity composite film layer. The thermal insulation layer has heat insulation performance; the first waterproof and breathable layer allows the discharge of body moisture and effectively prevents the penetration of liquid water; the moisture discharged through the first waterproof and breathable layer is rapidly diffused to the second moisture absorption layer through the first moisture absorption layer; the second waterproof and breathable layer can effectively prevent the infiltration of external rain and snow, and plays a windproof and waterproof role; the high-reflectivity composite film layer is prepared from a PET composite film layer and a functional coating layer, has high reflectivity, and through the compounding of multiple layers of materials, an emergency thermal blanket with good environmental durability and high mechanical strength is obtained, and has a wide application prospect.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and more particularly to a method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film. Background Technology

[0002] As living standards improve, people have higher and higher requirements for the comfort and various functions of fabrics, and are no longer limited to just covering the body, but are developing in the direction of multi-functionality and diversification.

[0003] For example, emergency thermal blankets, due to their heat insulation, waterproofing, and portability, have become a safety guarantee in emergency situations during outdoor camping and sports. When maintaining body temperature is crucial, emergency thermal blankets are essential survival items, providing a barrier against harsh weather conditions such as rain, strong winds, and extreme cold. Extremely lightweight, they can reduce body heat loss by 90% in frigid conditions and reflect light in extreme heat, inhibiting hypothermia. In outdoor sports, mountaineers, outdoor athletes, mountain rescue teams, and skiers all consider emergency thermal blankets necessary emergency equipment for survival and safety.

[0004] Metallized film is a composite film formed under high vacuum conditions by melting and vaporizing metallic aluminum through resistance, high-frequency, or electron beam heating to form aluminum vapor, which is then deposited onto the surface of a plastic film substrate. Vacuum coating technology first appeared in the 1930s and saw significant development in the 1970s. Compared to aluminum foil / plastic film structures, metallized film not only has highly efficient light reflection properties and excellent toughness, but also significantly reduces the amount of aluminum consumables used. Typically, the thickness of the aluminum coating on the surface of a vacuum-metallized film is about 30-40 nm, only about 1 / 200th the thickness of rolled aluminum foil, which can reduce production costs.

[0005] Metallized polyester (PET) film is a composite film of PET film and metallic aluminum. It is a barrier film formed by depositing aluminum atoms onto the PET film through vacuum metallization processes such as evaporation, sputtering, and ion plating. This material combines the heat resistance, toughness, and abrasion resistance of PET with the reflectivity and conductivity of metallic aluminum, making it suitable as a coating substrate for spacecraft, electronic and electrical devices, magnetic recording materials, and solar cells.

[0006] Currently, the most common emergency thermal blankets on the market are made of aluminum foil or plastic film plated with aluminum. Their main functions are: in cold weather, wrapping them around the body or vulnerable areas allows them to reflect the heat radiated by the body using highly reflective materials, while reducing the loss of hot air near the skin surface, thus achieving a warming effect. In wilderness emergencies, wrapping an emergency thermal blanket around the body can prevent hypothermia, and its reflective outer layer can help rescuers locate targets. However, thermal blankets made from plastic film plated with aluminum are mostly single-sided aluminum-plated, resulting in a thin aluminum layer that is prone to pinholes or peeling after wrinkling or friction, leading to limited reflectivity, poor mechanical properties, and room for improvement in environmental durability.

[0007] Therefore, based on the relevant technologies mentioned above, there is an urgent need to develop a method for preparing a high-reflectivity emergency thermal insulation blanket based on PET aluminized film. Summary of the Invention

[0008] In view of this, the purpose of this invention is to propose a method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film, so as to solve the problems of low reflectivity, poor mechanical properties, and poor environmental durability of emergency thermal insulation blankets in the prior art.

[0009] To achieve the above objectives, the present invention provides a method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film.

[0010] A method for preparing a high-reflectivity emergency thermal insulation blanket based on PET aluminized film, wherein the high-reflectivity emergency thermal insulation blanket based on PET aluminized film comprises, from bottom to top, a thermal insulation layer, a first waterproof and breathable layer, a first moisture-absorbing layer, a second moisture-absorbing layer, a second waterproof and breathable layer, and a high-reflectivity composite film layer.

[0011] The high-reflectivity composite film layer includes a PET composite film layer and a functional coating applied to the PET composite film layer;

[0012] The PET composite film layer includes a first PET aluminized film layer, a polymer adhesive layer, and a second PET aluminized film layer.

[0013] The PET composite film layer has a sandwich symmetrical structure of a first PET aluminized film layer, a polymer adhesive layer, and a second PET aluminized film layer;

[0014] The thickness of the high-reflectivity composite film is 320-450 nm.

[0015] Preferably, the insulation layer is a polypropylene aluminum-coated film;

[0016] The thickness of the aluminum layer in the insulation layer is 25-40 nm;

[0017] The first waterproof and breathable layer is made of flash-spun high-density polyethylene nonwoven fabric with a moisture permeability of 7000-7500 g / (m*m*24h) and a weight of 50-60 g / m. 2 ;

[0018] The second waterproof and breathable layer is made of flash-spun high-density polyethylene nonwoven fabric with a moisture permeability of 7000-7500 g / (m*m*24h) and a weight of 40-50 g / m. 2 .

[0019] Preferably, the first moisture-absorbing layer is made of polypropylene knitted with Y-shaped fiber cross-section by melt spinning, and has a weight of 10-20 g / m². 2 ;

[0020] The second moisture-absorbing layer is made of ethylene-vinyl acetate copolymer fiber containing calcium chloride, with a weight of 65-85 g / m². 2 ;

[0021] The polymer adhesive layer is a polyurethane adhesive.

[0022] Preferably, the polyurethane adhesive is prepared as follows:

[0023] Step A1. Place the polyether polyol and deionized water in a three-necked flask and stir until homogeneous. After vacuum dehydration at 110-120℃ for 2-2.5h, mix with polymethylene polyphenyl polyisocyanate and add to the three-necked flask. Heat and stir at 500-600rpm and 45-50℃ until homogeneous. Then raise the temperature to 84-92℃ and react for 4.5-5.5h to obtain the first component.

[0024] Step A2. Heat the 3A molecular sieve in a muffle furnace at 550-600℃ for 1-1.5h, then cool it to room temperature and add it to a three-necked flask with polyether triol and organic bismuth catalyst. Mix and stir for 1.5-2h and then degas under vacuum to obtain the second component.

[0025] Step A3. Under a nitrogen atmosphere, propylene carbonate and diethylenetriamine are added to a three-necked flask and heated at 90-100℃ for 3.5-4.5 h to obtain compound A;

[0026] Step A4. After mixing the first component and the second component evenly, mix them with polymethylene polyphenyl polyisocyanate and compound A. Heat and stir at 500-600 rpm and 45-50℃ until the mixture is evenly mixed. Then raise the temperature to 84-92℃ and react for 4.5-5.5 hours to obtain a polyurethane prepolymer. Mix the polyurethane prepolymer with the second component evenly to obtain a polyurethane adhesive.

[0027] Preferably, the mass ratio of the polyether polyol, deionized water and polymethylene polyphenyl polyisocyanate in step A1 is 53-63:82-95:7.2-8;

[0028] The hydroxyl value of the polyether polyol is 50-60 mg KOH / g;

[0029] The -NCO content of the polymethylene polyphenyl polyisocyanate is 30%-32%;

[0030] The mass ratio of the 3A molecular sieve, polyether triol, and organic bismuth catalyst in step A2 is 2-3:15-20:0.1-0.3.

[0031] Preferably, the mass ratio of propylene carbonate to diethylenetriamine in step A3 is 9-14:4.4-7.2;

[0032] In step A4, the mass ratio of the first component to the second component, the polymethylene polyphenyl polyisocyanate, and compound A is 27.5-33:45-53:12.5-17.4:3.6-5;

[0033] The mass ratio of the polyurethane prepolymer to the second component is 30-42:11-14.5.

[0034] Preferably, the high-reflectivity composite film layer is prepared as follows:

[0035] Step B1. Two rolls of PET film are subjected to corona treatment to make their surface tension reach 50-52 mN / m, and then plasma treatment is performed on them with nitrogen as the discharge atmosphere gas to obtain pretreated PET film.

[0036] Step B2. Place the pretreated PET film under a vacuum of 5.0 × 10⁻⁶. ⁻³ Inside the Pa cavity, a high-purity aluminum target with a purity greater than 99.9% is used to deposit a dense aluminum layer with a thickness of 100±20nm on the surface of the pretreated PET film using a medium-frequency pulse magnetron sputtering process. The aluminum-coated surfaces of two rolls of aluminized film are then placed face to face and coated with polyurethane adhesive evenly between them using a two-roll hot press laminating machine. The lamination temperature is controlled at 80-120℃, the pressure at 0.3-0.6MPa, and the speed at 5-10m / min to obtain the PET composite film layer.

[0037] Step B3. Add polyvinylidene fluoride and acrylate resin to ethyl acetate and mix evenly. Then add nano silica, leveling agent BYK-333, silane coupling agent KH-560 and bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate. After stirring evenly, apply a functional coating to the surface of the PET composite film using a microgravure roller coating method. Cure at 130-140℃ to obtain a high-reflectivity composite film.

[0038] Preferably, during the plasma treatment in step B1, the discharge voltage is 6800-7300V, the discharge current is 0.3A, the nitrogen flow rate is 700-750mL / min, and the PET film winding speed is 230-280m / min.

[0039] Preferably, the ratio of polyvinylidene fluoride, acrylate resin, ethyl acetate, nano silica, leveling agent BYK-333, silane coupling agent KH-560, and bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate in step B3 is 30-40g:5-8g:80-100mL:0.5-1.3g:1-2g:1-2g:0.3-0.5g.

[0040] Preferably, it includes the following steps:

[0041] The thermal insulation layer and the first waterproof and breathable layer are bonded together using a dispensing machine to form component A. Then, the first moisture-absorbing layer is bonded to one side of the waterproof and breathable membrane of component A by spraying adhesive to form component B. Subsequently, a second moisture-absorbing layer is bonded to one side of the moisture-absorbing layer of component B by spraying adhesive to obtain component C. Then, a second waterproof and breathable layer is bonded to one side of the moisture-absorbing layer of component C by a dispensing machine to obtain component D. Finally, a high-reflectivity composite layer is laminated to one side of the waterproof and breathable layer of component D to obtain a high-reflectivity emergency thermal insulation blanket based on PET aluminized film.

[0042] The beneficial effects of this invention are:

[0043] This invention provides a method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film. The high-reflectivity emergency thermal insulation blanket based on a PET aluminized film includes: a first waterproof and breathable layer above the thermal insulation layer, a first moisture-absorbing layer above the first waterproof and breathable layer, a second moisture-absorbing layer above the first moisture-absorbing layer, a second waterproof and breathable layer above the second moisture-absorbing layer, and a high-reflectivity composite film layer above the second waterproof and breathable layer.

[0044] The insulation layer used in this invention has heat insulation properties. The first waterproof and breathable layer allows moisture to escape while effectively preventing liquid water from passing through. Moisture released through the first waterproof and breathable layer is rapidly diffused to the second moisture-absorbing layer via the first moisture-absorbing layer, reacting with calcium chloride to absorb moisture and release a certain amount of heat. The second waterproof and breathable layer effectively prevents external rain and snow from penetrating, providing wind and water protection. In the high-reflectivity composite film layer, two rolls of PET film are aluminum-plated and bonded to a polymer adhesive layer through corona treatment, plasma treatment, and medium-frequency pulse magnetron sputtering to obtain the PET composite film layer, effectively enhancing the effect of evaporated aluminum on PET. The adhesion of the film improves the mechanical strength and reflectivity of the PET aluminized film. A functional coating with weather resistance and abrasion resistance is then applied to the PET composite film layer, resulting in a high-reflectivity composite film layer with excellent abrasion resistance, weather resistance, and mechanical properties. By combining an insulation layer, a first waterproof and breathable layer, a first moisture-absorbing layer, a second moisture-absorbing layer, a second waterproof and breathable layer, and a high-reflectivity composite film layer, a high-reflectivity emergency insulation blanket based on PET aluminized film is obtained. This blanket possesses high reflectivity, good environmental durability, and high mechanical strength, and has broad application prospects compared to existing technologies. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0046] Example 1: A method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film, comprising the following steps:

[0047] S1. 53g of polyether polyol and 82g of deionized water were placed in a three-necked flask and stirred evenly. After vacuum dehydration at 110°C for 2 hours, it was mixed with 7.2g of polymethylene polyphenyl polyisocyanate and added to the three-necked flask. The mixture was heated and stirred at 500 rpm and 45°C until it was evenly mixed. Then the temperature was raised to 84°C and the reaction was carried out for 4.5 hours to obtain the first component.

[0048] S2. 2g of 3A molecular sieve was heated in a muffle furnace at 550℃ for 1h, then cooled to room temperature and added to a three-necked flask with 15g of polyether triol and 0.1g of organic bismuth catalyst. After mixing and stirring for 1.5h, vacuum degassing was performed to obtain the second component.

[0049] S3. Under a nitrogen atmosphere, 9 g of propylene carbonate and 4.4 g of diethylenetriamine were added to a three-necked flask and heated at 90 °C for 3.5 h to obtain compound A;

[0050] S4. Mix 27.5g of the first component and 45g of the second component evenly, then mix with 12.5g of polymethylene polyphenyl polyisocyanate and 3.6g of compound A. Heat and stir at 500rpm and 45℃ until evenly mixed, then raise the temperature to 84℃ and react for 4.5h to obtain a polyurethane prepolymer. Mix 30g of the polyurethane prepolymer with 11g of the second component evenly to obtain a polyurethane adhesive.

[0051] S5. Two rolls of PET film were subjected to corona treatment to make their surface tension reach 50mN / m. Then, they were subjected to plasma treatment with nitrogen as the discharge atmosphere gas, under the conditions of discharge voltage of 6800V, discharge current of 0.3A, nitrogen flow rate of 700mL / min and PET film winding speed of 230m / min, to obtain pretreated PET film.

[0052] S6. Place the pretreated PET film under a vacuum of 5.0 × 10⁻⁶. ⁻³ Inside the Pa cavity, a high-purity aluminum target with a purity greater than 99.9% is used to deposit a dense aluminum layer with a thickness of 100±20nm on the surface of the pretreated PET film through a medium-frequency pulse magnetron sputtering process. The aluminum-coated surfaces of two rolls of aluminized film are placed face to face and polyurethane adhesive is uniformly coated between them through a two-roll hot press laminating machine. The lamination temperature is controlled at 80℃, the pressure is 0.3MPa, and the speed is 5m / min to obtain the PET composite film layer.

[0053] S7. Add 30g of polyvinylidene fluoride and 5g of acrylate resin to 80mL of ethyl acetate and mix well. Then add 0.5g of nano silica, 1g of leveling agent BYK-333, 1g of silane coupling agent KH-560 and 0.3g of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate. After stirring evenly, apply a functional coating to the surface of the PET composite film using a micro-gravure roller coating method. Cure at 130℃ to obtain a high-reflectivity composite film.

[0054] S8. The thermal insulation layer and the first waterproof and breathable layer are bonded together using a dispensing machine to form component A. Then, the first moisture-absorbing layer is bonded to the waterproof and breathable membrane side of component A by spraying adhesive to form component B. Subsequently, the second moisture-absorbing layer is bonded to the moisture-absorbing layer side of component B by spraying adhesive to obtain component C. Then, the second waterproof and breathable layer is bonded to the moisture-absorbing layer side of component C by a dispensing machine to obtain component D. Finally, a high-reflectivity composite layer is laminated to the waterproof and breathable layer side of component D to obtain a high-reflectivity emergency thermal insulation blanket based on PET aluminized film.

[0055] Example 2: A method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film, comprising the following steps:

[0056] S1. Place 55g of polyether polyol and 85g of deionized water in a three-necked flask and stir until homogeneous. After vacuum dehydration at 112℃ for 2h, mix with 7.4g of polymethylene polyphenyl polyisocyanate and add to the three-necked flask. Heat and stir at 520rpm and 46℃ until homogeneous. Then raise the temperature to 86℃ and react for 4.5h to obtain the first component.

[0057] S2. 2.2g of 3A molecular sieve was heated in a muffle furnace at 560℃ for 1h, then cooled to room temperature and added to a three-necked flask with 16g of polyether triol and 0.15g of organic bismuth catalyst. After mixing and stirring for 1.5h, vacuum degassing was performed to obtain the second component.

[0058] S3. Under a nitrogen atmosphere, 10 g of propylene carbonate and 4.9 g of diethylenetriamine were added to a three-necked flask and heated at 92 °C for 3.5 h to obtain compound A;

[0059] S4. Mix 28.5g of the first component and 47g of the second component evenly, then mix with 13.5g of polymethylene polyphenyl polyisocyanate and 4g of compound A. Heat and stir at 540rpm and 47℃ until evenly mixed, then raise the temperature to 88℃ and react for 4.5h to obtain a polyurethane prepolymer. Mix 33g of the polyurethane prepolymer with 11.5g of the second component evenly to obtain a polyurethane adhesive.

[0060] S5. Two rolls of PET film were subjected to corona treatment to make their surface tension reach 50mN / m. Then, they were subjected to plasma treatment with nitrogen as the discharge atmosphere gas, under the conditions of discharge voltage of 6900V, discharge current of 0.3A, nitrogen flow rate of 710mL / min and PET film winding speed of 240m / min to obtain pretreated PET film.

[0061] S6. Place the pretreated PET film under a vacuum of 5.0 × 10⁻⁶. ⁻³ Inside the Pa cavity, a high-purity aluminum target with a purity greater than 99.9% is used to deposit a dense aluminum layer with a thickness of 100±20nm on the surface of the pretreated PET film through a medium-frequency pulse magnetron sputtering process. The aluminum-coated surfaces of two rolls of aluminized film are placed face to face and polyurethane adhesive is uniformly coated between them through a two-roll hot press laminating machine. The lamination temperature is controlled at 85℃, the pressure is 0.4MPa, and the speed is 6m / min to obtain the PET composite film layer.

[0062] S7. Add 32g of polyvinylidene fluoride and 5.5g of acrylate resin to 85mL of ethyl acetate and mix well. Then add 0.65g of nano silica, 1.2g of leveling agent BYK-333, 1.2g of silane coupling agent KH-560 and 0.35g of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate. After stirring well, apply a functional coating to the surface of the PET composite film using a micro-gravure roller coating method. Cure at 132℃ to obtain a high-reflectivity composite film.

[0063] S8. The thermal insulation layer and the first waterproof and breathable layer are bonded together using a dispensing machine to form component A. Then, the first moisture-absorbing layer is bonded to the waterproof and breathable membrane side of component A by spraying adhesive to form component B. Subsequently, the second moisture-absorbing layer is bonded to the moisture-absorbing layer side of component B by spraying adhesive to obtain component C. Then, the second waterproof and breathable layer is bonded to the moisture-absorbing layer side of component C by a dispensing machine to obtain component D. Finally, a high-reflectivity composite layer is laminated to the waterproof and breathable layer side of component D to obtain a high-reflectivity emergency thermal insulation blanket based on PET aluminized film.

[0064] Example 3: A method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film, comprising the following steps:

[0065] S1. 57g of polyether polyol and 86g of deionized water were placed in a three-necked flask and stirred evenly. After vacuum dehydration at 114℃ for 2h, it was mixed with 7.6g of polymethylene polyphenyl polyisocyanate and added to the three-necked flask. The mixture was heated and stirred at 550rpm and 48℃ until it was evenly mixed. The temperature was then raised to 88℃ and reacted for 5h to obtain the first component.

[0066] S2. 2.4 g of 3A molecular sieve was heated in a muffle furnace at 570 °C for 1 h, then cooled to room temperature and added to a three-necked flask with 17 g of polyether triol and 0.2 g of organic bismuth catalyst. After mixing and stirring for 1.5 h, vacuum degassing was performed to obtain the second component.

[0067] S3. Under a nitrogen atmosphere, 11g of propylene carbonate and 5.5g of diethylenetriamine were added to a three-necked flask and heated at 94°C for 4 hours to obtain compound A;

[0068] S4. Mix 30g of the first component and 49g of the second component evenly, then mix with 15g of polymethylene polyphenyl polyisocyanate and 4.5g of compound A. Heat and stir at 550rpm and 48℃ until evenly mixed, then heat to 88℃ and react for 5h to obtain polyurethane prepolymer. Mix 36g of polyurethane prepolymer and 12.5g of the second component evenly to obtain polyurethane adhesive.

[0069] S5. Two rolls of PET film were subjected to corona treatment to achieve a surface tension of 51 mN / m. Then, plasma treatment was carried out with nitrogen as the discharge atmosphere gas under the conditions of discharge voltage of 7000 V, discharge current of 0.3 A, nitrogen flow rate of 720 mL / min and PET film winding speed of 250 m / min to obtain pretreated PET film.

[0070] S6. Place the pretreated PET film under a vacuum of 5.0 × 10⁻⁶. ⁻³ Inside the cavity of Pa, a high-purity aluminum target with a purity greater than 99.9% is used to deposit a dense aluminum layer with a thickness of 100±20nm on the surface of the pretreated PET film through a medium-frequency pulse magnetron sputtering process. The aluminum-coated surfaces of two rolls of aluminized film are placed face to face and polyurethane adhesive is uniformly coated between them through a two-roll hot press laminating machine. The lamination temperature is controlled at 100℃, the pressure is 0.5MPa, and the speed is 7m / min to obtain the PET composite film layer.

[0071] S7. Add 35g of polyvinylidene fluoride and 7g of acrylate resin to 90mL of ethyl acetate and mix well. Then add 0.8g of nano silica, 1.5g of leveling agent BYK-333, 1.5g of silane coupling agent KH-560 and 0.4g of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate. After stirring well, apply a functional coating to the surface of the PET composite film using a micro-gravure roller coating method. Cure at 135℃ to obtain a high-reflectivity composite film.

[0072] S8. The thermal insulation layer and the first waterproof and breathable layer are bonded together using a dispensing machine to form component A. Then, the first moisture-absorbing layer is bonded to the waterproof and breathable membrane side of component A by spraying adhesive to form component B. Subsequently, the second moisture-absorbing layer is bonded to the moisture-absorbing layer side of component B by spraying adhesive to obtain component C. Then, the second waterproof and breathable layer is bonded to the moisture-absorbing layer side of component C by a dispensing machine to obtain component D. Finally, a high-reflectivity composite layer is laminated to the waterproof and breathable layer side of component D to obtain a high-reflectivity emergency thermal insulation blanket based on PET aluminized film.

[0073] Example 4: A method for preparing a high-reflectivity emergency thermal insulation blanket based on PET aluminized film, comprising the following steps:

[0074] S1. 60g of polyether polyol and 92g of deionized water were placed in a three-necked flask and stirred evenly. After vacuum dehydration at 117°C for 2.5h, it was mixed with 7.8g of polymethylene polyphenyl polyisocyanate and added to the three-necked flask. The mixture was heated and stirred at 580rpm and 48°C until it was evenly mixed. The temperature was then raised to 90°C and reacted for 5h to obtain the first component.

[0075] S2. 2.7g of 3A molecular sieve was heated in a muffle furnace at 580℃ for 1.5h, then cooled to room temperature and added to a three-necked flask with 18g of polyether triol and 0.25g of organic bismuth catalyst. After mixing and stirring for 2h, vacuum degassing was performed to obtain the second component.

[0076] S3. Under a nitrogen atmosphere, 12.5 g of propylene carbonate and 6.5 g of diethylenetriamine were added to a three-necked flask and heated at 98 °C for 4 h to obtain compound A;

[0077] S4. Mix 31.5g of the first component and 50g of the second component evenly, then mix with 16g of polymethylene polyphenyl polyisocyanate and 4.5g of compound A. Heat and stir at 580rpm and 48℃ until evenly mixed, then heat to 90℃ and react for 5h to obtain polyurethane prepolymer. Mix 40g of polyurethane prepolymer with 13.5g of the second component evenly to obtain polyurethane adhesive.

[0078] S5. Two rolls of PET film were subjected to corona treatment to achieve a surface tension of 52 mN / m. Then, plasma treatment was carried out with nitrogen as the discharge atmosphere gas under the conditions of discharge voltage of 7200 V, discharge current of 0.3 A, nitrogen flow rate of 740 mL / min, and PET film winding speed of 260 m / min to obtain pretreated PET film.

[0079] S6. Place the pretreated PET film under a vacuum of 5.0 × 10⁻⁶. ⁻³ Inside the Pa cavity, a high-purity aluminum target with a purity greater than 99.9% is used to deposit a dense aluminum layer with a thickness of 100±20nm on the surface of the pretreated PET film through a medium-frequency pulse magnetron sputtering process. The aluminum-coated surfaces of two rolls of aluminized film are placed face to face and polyurethane adhesive is uniformly coated between them through a two-roll hot press laminating machine. The lamination temperature is controlled at 110℃, the pressure is 0.5MPa, and the speed is 8m / min to obtain the PET composite film layer.

[0080] S7. Add 37g of polyvinylidene fluoride and 7g of acrylate resin to 94mL of ethyl acetate and mix well. Then add 1.1g of nano silica, 1.7g of leveling agent BYK-333, 1.7g of silane coupling agent KH-560 and 0.45g of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate. After stirring well, apply a functional coating to the surface of the PET composite film using a micro-gravure roller coating method. Cure at 137℃ to obtain a high-reflectivity composite film.

[0081] S8. The thermal insulation layer and the first waterproof and breathable layer are bonded together using a dispensing machine to form component A. Then, the first moisture-absorbing layer is bonded to the waterproof and breathable membrane side of component A by spraying adhesive to form component B. Subsequently, the second moisture-absorbing layer is bonded to the moisture-absorbing layer side of component B by spraying adhesive to obtain component C. Then, the second waterproof and breathable layer is bonded to the moisture-absorbing layer side of component C by a dispensing machine to obtain component D. Finally, a high-reflectivity composite layer is laminated to the waterproof and breathable layer side of component D to obtain a high-reflectivity emergency thermal insulation blanket based on PET aluminized film.

[0082] Example 5: A method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film, comprising the following steps:

[0083] S1. 63g of polyether polyol and 95g of deionized water were placed in a three-necked flask and stirred evenly. After vacuum dehydration at 120°C for 2.5h, the mixture was added to the three-necked flask with 8g of polymethylene polyphenyl polyisocyanate. The mixture was heated and stirred at 600rpm and 50°C until it was evenly mixed. The temperature was then raised to 92°C and reacted for 5.5h to obtain the first component.

[0084] S2. 3g of 3A molecular sieve was heated in a muffle furnace at 600℃ for 1.5h, then cooled to room temperature and added to a three-necked flask with 20g of polyether triol and 0.3g of organic bismuth catalyst. After mixing and stirring for 2h, vacuum degassing was performed to obtain the second component.

[0085] S3. Under a nitrogen atmosphere, 14 g of propylene carbonate and 7.2 g of diethylenetriamine were added to a three-necked flask and heated at 100 °C for 4.5 h to obtain compound A;

[0086] S4. Mix 33g of the first component and 53g of the second component evenly, then mix with 17.4g of polymethylene polyphenyl polyisocyanate and 5g of compound A. Heat and stir at 600rpm and 50℃ until evenly mixed, then heat to 92℃ and react for 5.5h to obtain polyurethane prepolymer. Mix 42g of polyurethane prepolymer with 14.5g of the second component evenly to obtain polyurethane adhesive.

[0087] S5. Two rolls of PET film were subjected to corona treatment to achieve a surface tension of 52 mN / m. Then, plasma treatment was carried out with nitrogen as the discharge atmosphere gas under the conditions of discharge voltage of 7300 V, discharge current of 0.3 A, nitrogen flow rate of 750 mL / min and PET film winding speed of 280 m / min to obtain pretreated PET film.

[0088] S6. Place the pretreated PET film under a vacuum of 5.0 × 10⁻⁶. ⁻³Inside the cavity of Pa, a high-purity aluminum target with a purity greater than 99.9% is used to deposit a dense aluminum layer with a thickness of 100±20nm on the surface of the pretreated PET film through a medium-frequency pulse magnetron sputtering process. The aluminum-coated surfaces of two rolls of aluminized film are placed face to face and polyurethane adhesive is uniformly coated between them through a two-roll hot press laminating machine. The lamination temperature is controlled at 120℃, the pressure is 0.6MPa, and the speed is 10m / min to obtain the PET composite film layer.

[0089] S7. Add 40g of polyvinylidene fluoride and 8g of acrylate resin to 100mL of ethyl acetate and mix well. Then add 1.3g of nano silica, 2g of leveling agent BYK-333, 2g of silane coupling agent KH-560 and 0.5g of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate. After stirring well, apply a functional coating to the surface of the PET composite film using a micro-gravure roller coating method. Cure at 140℃ to obtain a high-reflectivity composite film.

[0090] S8. The thermal insulation layer and the first waterproof and breathable layer are bonded together using a dispensing machine to form component A. Then, the first moisture-absorbing layer is bonded to the waterproof and breathable membrane side of component A by spraying adhesive to form component B. Subsequently, the second moisture-absorbing layer is bonded to the moisture-absorbing layer side of component B by spraying adhesive to obtain component C. Then, the second waterproof and breathable layer is bonded to the moisture-absorbing layer side of component C by a dispensing machine to obtain component D. Finally, a high-reflectivity composite layer is laminated to the waterproof and breathable layer side of component D to obtain a high-reflectivity emergency thermal insulation blanket based on PET aluminized film.

[0091] Comparative Example 1:

[0092] S1. 53g of polyether polyol and 82g of deionized water were placed in a three-necked flask and stirred evenly. After vacuum dehydration at 110°C for 2 hours, it was mixed with 7.2g of polymethylene polyphenyl polyisocyanate and added to the three-necked flask. The mixture was heated and stirred at 500 rpm and 45°C until it was evenly mixed. Then the temperature was raised to 84°C and the reaction was carried out for 4.5 hours to obtain the first component.

[0093] S2. 2g of 3A molecular sieve was heated in a muffle furnace at 550℃ for 1h, then cooled to room temperature and added to a three-necked flask with 15g of polyether triol and 0.1g of organic bismuth catalyst. After mixing and stirring for 1.5h, vacuum degassing was performed to obtain the second component.

[0094] S3. Under a nitrogen atmosphere, 9 g of propylene carbonate and 4.4 g of diethylenetriamine were added to a three-necked flask and heated at 90 °C for 3.5 h to obtain compound A;

[0095] S4. Mix 27.5g of the first component and 45g of the second component evenly, then mix with 12.5g of polymethylene polyphenyl polyisocyanate and 3.6g of compound A. Heat and stir at 500rpm and 45℃ until evenly mixed, then raise the temperature to 84℃ and react for 4.5h to obtain a polyurethane prepolymer. Mix 30g of the polyurethane prepolymer with 11g of the second component evenly to obtain a polyurethane adhesive.

[0096] S5. Two rolls of PET film are subjected to corona treatment to make their surface tension reach 50mN / m, and then the pretreated PET film is obtained.

[0097] S6. Place the pretreated PET film under a vacuum of 5.0 × 10⁻⁶. ⁻³ Inside the Pa cavity, a high-purity aluminum target with a purity greater than 99.9% is used to deposit a dense aluminum layer with a thickness of 100±20nm on the surface of the pretreated PET film through a medium-frequency pulse magnetron sputtering process. The aluminum-coated surfaces of two rolls of aluminized film are placed face to face and polyurethane adhesive is uniformly coated between them through a two-roll hot press laminating machine. The lamination temperature is controlled at 80℃, the pressure is 0.3MPa, and the speed is 5m / min to obtain the PET composite film layer.

[0098] S7. Add 30g of polyvinylidene fluoride and 5g of acrylate resin to 80mL of ethyl acetate and mix well. Then add 0.5g of nano silica, 1g of leveling agent BYK-333, 1g of silane coupling agent KH-560 and 0.3g of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate. After stirring evenly, apply a functional coating to the surface of the PET composite film using a micro-gravure roller coating method. Cure at 130℃ to obtain a high-reflectivity composite film.

[0099] S8. The thermal insulation layer and the first waterproof and breathable layer are bonded together using a dispensing machine to form component A. Then, the first moisture-absorbing layer is bonded to the waterproof and breathable membrane side of component A by spraying adhesive to form component B. Subsequently, the second moisture-absorbing layer is bonded to the moisture-absorbing layer side of component B by spraying adhesive to obtain component C. Then, the second waterproof and breathable layer is bonded to the moisture-absorbing layer side of component C by a dispensing machine to obtain component D. Finally, a high-reflectivity composite layer is laminated to the waterproof and breathable layer side of component D to obtain a high-reflectivity emergency thermal insulation blanket based on PET aluminized film.

[0100] Comparative Example 2:

[0101] Compared with Example 1, this comparative example did not add a first moisture-absorbing layer in the preparation process of the emergency thermal blanket. All other steps and parameters were the same, and will not be repeated here. The final result was an emergency thermal blanket.

[0102] Comparative Example 3:

[0103] Compared with Example 1, this comparative example did not add a first waterproof and moisture-absorbing layer during the preparation of the emergency thermal blanket. All other steps and parameters were the same, and will not be repeated here. The final emergency thermal blanket was obtained.

[0104] Comparative Example 4:

[0105] Compared with Example 1, this comparative example did not add an insulation layer during the preparation of the emergency thermal blanket. All other steps and parameters were the same, and will not be repeated here. The final result was an emergency thermal blanket.

[0106] Comparative Example 5:

[0107] Compared with Example 1, this comparative example only replaces the "composite high reflectivity composite layer" with the "PET composite film layer". All other steps and parameters are the same, and will not be repeated in this comparative example. Finally, an emergency thermal insulation blanket is obtained.

[0108] Comparative Example 6:

[0109] Compared with Example 1, this comparative example only replaces the "thermal insulation layer - first waterproof and breathable layer - first moisture-absorbing layer - second moisture-absorbing layer - second waterproof and breathable layer - high reflective composite film layer structure" with "thermal insulation layer - first waterproof and breathable layer - first moisture-absorbing layer - second waterproof and breathable layer - second moisture-absorbing layer - high reflective composite film layer structure". All other steps and parameters are the same, and will not be repeated in this comparative example. Finally, an emergency thermal insulation blanket is obtained.

[0110] Comparative Example 7:

[0111] Compared with Example 1, this comparative example only replaces the "composite high reflectivity composite layer" with "single-layer PET aluminized film". All other steps and parameters are the same, and will not be repeated in this comparative example. Finally, an emergency thermal insulation blanket is obtained.

[0112] Performance testing:

[0113] Reflectivity: Referring to ASTM E408, "Standard Test Method for Measuring Hemispherical Reflectivity and Emissivity of Materials Using an Integrating Sphere", the reflectivity of the high-reflectivity emergency insulation blankets based on PET aluminized film prepared in Examples 1-5 and Comparative Examples 1-7 was tested at 10 μm.

[0114] Thermal resistance: In accordance with the ISO 23537 test standard, the thermal resistance values ​​of the high reflectivity emergency insulation blankets based on PET aluminized film prepared in Examples 1-5 and Comparative Examples 1-7 were tested at -30℃, with the unit being m²·K / W.

[0115] Moisture permeability: The moisture permeability of the high reflectivity emergency thermal insulation blankets based on PET aluminized film prepared in Examples 1-5 and Comparative Examples 1-7 was tested according to the ASTM E96 test standard. The unit is g / m² / 24h.

[0116] Table 1. Summary of experimental data from Examples 1-5 and Comparative Examples 1-7

[0117] Data Analysis:

[0118] As shown in Table 1, the emergency thermal insulation blanket prepared by this invention has higher reflectivity, environmental durability, mechanical strength, thermal insulation, and waterproof and breathable properties. This may be due to the thermal insulation properties of the insulation layer used in this invention, the first waterproof and breathable layer allowing the body moisture to escape while effectively preventing the permeation of liquid water, and the moisture exhausted through the first waterproof and breathable layer rapidly diffusing to the second moisture-absorbing layer via the first moisture-absorbing layer, reacting with calcium chloride to absorb moisture and release a certain amount of heat. The second waterproof and breathable layer effectively prevents the penetration of external rain and snow, playing a role in wind and water protection. In the high-reflectivity composite film layer, two rolls of PET film are treated with corona discharge, plasma treatment, and medium-frequency pulse magnetic flux. Aluminum deposition via controlled sputtering is bonded to a polymer adhesive layer to obtain a PET composite film, which effectively enhances the adhesion of vapor-deposited aluminum to the PET film, thereby improving the mechanical strength and reflectivity of the PET aluminized film. A functional coating with weather resistance and abrasion resistance is then applied to the PET composite film, resulting in a high-reflectivity composite film with excellent abrasion resistance, weather resistance, and mechanical properties. By combining an insulation layer, a first waterproof and breathable layer, a first moisture-absorbing layer, a second moisture-absorbing layer, a second waterproof and breathable layer, and the high-reflectivity composite film, a high-reflectivity emergency insulation blanket based on a PET aluminized film is obtained, exhibiting high reflectivity, good environmental durability, and high mechanical strength.

[0119] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0120] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film, characterized in that, The high-reflectivity emergency thermal insulation blanket based on PET aluminized film consists of, from bottom to top, a thermal insulation layer, a first waterproof and breathable layer, a first moisture-absorbing layer, a second moisture-absorbing layer, a second waterproof and breathable layer, and a high-reflectivity composite film layer. The high-reflectivity composite film layer includes a PET composite film layer and a functional coating applied to the PET composite film layer; The PET composite film layer includes a first PET aluminized film layer, a polymer adhesive layer, and a second PET aluminized film layer. The PET composite film layer has a sandwich symmetrical structure of a first PET aluminized film layer, a polymer adhesive layer, and a second PET aluminized film layer; The thickness of the high-reflectivity composite film is 320-450 nm.

2. The method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film according to claim 1, characterized in that, The insulation layer is a polypropylene aluminum-coated film; The thickness of the aluminum layer in the insulation layer is 25-40 nm; The first waterproof and breathable layer is made of flash-spun high-density polyethylene nonwoven fabric with a moisture permeability of 7000-7500 g / (m*m*24h) and a weight of 50-60 g / m. 2 ; The second waterproof and breathable layer is made of flash-spun high-density polyethylene nonwoven fabric with a moisture permeability of 7000-7500 g / (m*m*24h) and a weight of 40-50 g / m. 2 .

3. The method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film according to claim 1, characterized in that, The first moisture-absorbing layer is made of polypropylene knitted with Y-shaped fiber cross-section by melt spinning, and has a weight of 10-20 g / m². 2 ; The second moisture-absorbing layer is made of ethylene-vinyl acetate copolymer fiber containing calcium chloride, with a weight of 65-85 g / m². 2 ; The polymer adhesive layer is a polyurethane adhesive.

4. The method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film according to claim 3, characterized in that, The polyurethane adhesive is prepared as follows: Step A1. Place the polyether polyol and deionized water in a three-necked flask and stir until homogeneous. After vacuum dehydration at 110-120℃ for 2-2.5h, mix with polymethylene polyphenyl polyisocyanate and add to the three-necked flask. Heat and stir at 500-600rpm and 45-50℃ until homogeneous. Then raise the temperature to 84-92℃ and react for 4.5-5.5h to obtain the first component. Step A2. Heat the 3A molecular sieve in a muffle furnace at 550-600℃ for 1-1.5h, then cool it to room temperature and add it to a three-necked flask with polyether triol and organic bismuth catalyst. Mix and stir for 1.5-2h, then degas under vacuum to obtain the second component. Step A3. Under a nitrogen atmosphere, propylene carbonate and diethylenetriamine are added to a three-necked flask and heated at 90-100℃ for 3.5-4.5 h to obtain compound A; Step A4. After mixing the first component and the second component evenly, mix them with polymethylene polyphenyl polyisocyanate and compound A. Heat and stir at 500-600 rpm and 45-50℃ until the mixture is evenly mixed. Then raise the temperature to 84-92℃ and react for 4.5-5.5 hours to obtain a polyurethane prepolymer. Mix the polyurethane prepolymer with the second component evenly to obtain a polyurethane adhesive.

5. The method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film according to claim 4, characterized in that, The mass ratio of polyether polyol, deionized water and polymethylene polyphenyl polyisocyanate in step A1 is 53-63:82-95:7.2-8; The hydroxyl value of the polyether polyol is 50-60 mg KOH / g; The -NCO content of the polymethylene polyphenyl polyisocyanate is 30%-32%; The mass ratio of the 3A molecular sieve, polyether triol, and organic bismuth catalyst in step A2 is 2-3:15-20:0.1-0.

3.

6. The method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film according to claim 4, characterized in that, The mass ratio of propylene carbonate to diethylenetriamine in step A3 is 9-14:4.4-7.2; In step A4, the mass ratio of the first component to the second component, polymethylene polyphenyl polyisocyanate, and compound A is 27.5-33:45-53:12.5-17.4:3.6-5; The mass ratio of the polyurethane prepolymer to the second component is 30-42:11-14.

5.

7. The method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film according to claim 1, characterized in that, The high-reflectivity composite film layer is prepared as follows: Step B1. Two rolls of PET film are subjected to corona treatment to make their surface tension reach 50-52 mN / m, and then plasma treatment is performed on them with nitrogen as the discharge atmosphere gas to obtain pretreated PET film. Step B2. Place the pretreated PET film under a vacuum of 5.0 × 10⁻⁶. ⁻³ Inside the Pa cavity, a high-purity aluminum target with a purity greater than 99.9% is used to deposit a dense aluminum layer with a thickness of 100±20nm on the surface of the pretreated PET film using a medium-frequency pulse magnetron sputtering process. The aluminum-coated surfaces of two rolls of aluminized film are then placed face to face and coated with polyurethane adhesive evenly between them using a two-roll hot press laminating machine. The lamination temperature is controlled at 80-120℃, the pressure at 0.3-0.6MPa, and the speed at 5-10m / min to obtain the PET composite film layer. Step B3. Add polyvinylidene fluoride and acrylate resin to ethyl acetate and mix evenly. Then add nano silica, leveling agent BYK-333, silane coupling agent KH-560 and bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate. After stirring evenly, apply a functional coating to the surface of the PET composite film using a microgravure roller coating method. Cure at 130-140℃ to obtain a high-reflectivity composite film.

8. The method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film according to claim 7, characterized in that, In step B1, the plasma treatment involves a discharge voltage of 6800-7300V, a discharge current of 0.3A, a nitrogen flow rate of 700-750mL / min, and a PET film winding speed of 230-280m / min.

9. The method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film according to claim 7, characterized in that, In step B3, the ratio of polyvinylidene fluoride, acrylate resin, ethyl acetate, nano silica, leveling agent BYK-333, silane coupling agent KH-560, and bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate is 30-40g:5-8g:80-100mL:0.5-1.3g:1-2g:1-2g:0.3-0.5g.

10. The method for preparing a high-reflectivity emergency thermal insulation blanket based on a PET aluminized film according to claim 1, characterized in that, Includes the following steps: The thermal insulation layer and the first waterproof and breathable layer are bonded together using a dispensing machine to form component A. Then, the first moisture-absorbing layer is bonded to one side of the waterproof and breathable membrane of component A by spraying adhesive to form component B. Subsequently, a second moisture-absorbing layer is bonded to one side of the moisture-absorbing layer of component B by spraying adhesive to obtain component C. Then, a second waterproof and breathable layer is bonded to one side of the moisture-absorbing layer of component C by a dispensing machine to obtain component D. Finally, a high-reflectivity composite layer is laminated to one side of the waterproof and breathable layer of component D to obtain a high-reflectivity emergency thermal insulation blanket based on PET aluminized film.

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