CN111607218B - Polyurethane flame-retardant film, preparation method and application thereof - Google Patents
Polyurethane flame-retardant film, preparation method and application thereof Download PDFInfo
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- CN111607218B CN111607218B CN202010498617.6A CN202010498617A CN111607218B CN 111607218 B CN111607218 B CN 111607218B CN 202010498617 A CN202010498617 A CN 202010498617A CN 111607218 B CN111607218 B CN 111607218B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J11/00—Removable external protective coverings specially adapted for vehicles or parts of vehicles, e.g. parking covers
- B60J11/04—Removable external protective coverings specially adapted for vehicles or parts of vehicles, e.g. parking covers for covering at least the roof of the vehicle, e.g. for covering the whole vehicle
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/50—Polyethers having heteroatoms other than oxygen
- C08G18/5075—Polyethers having heteroatoms other than oxygen having phosphorus
- C08G18/509—Polyethers having heteroatoms other than oxygen having phosphorus having nitrogen in addition to phosphorus
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/758—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing two or more cycloaliphatic rings
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
- C08J3/246—Intercrosslinking of at least two polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
- C08J2475/08—Polyurethanes from polyethers
Abstract
The invention provides a polyurethane flame-retardant film, a preparation method and application thereof. The polyurethane flame-retardant film comprises the following raw materials in parts by weight: 83-98 parts by weight of aliphatic TPU particles; 1-16 parts of a flame-retardant cross-linking agent; and 1-4.5 parts of an auxiliary agent. The polyurethane flame-retardant film has the tensile strength of 20-45Mpa, the tear strength of 75-85N/mm, the hardness of 80-95shore A and the flame-retardant grade of UL94 VTM-0, can overcome the technical defect that the existing invisible car cover film is flammable or has common flame-retardant performance, and has excellent mechanical properties while ensuring the flame-retardant effect.
Description
Technical Field
The invention belongs to the field of invisible car cover films, and particularly relates to a polyurethane flame-retardant film for an invisible car cover film and a preparation method thereof.
Background
In the actual use process of automobiles, sand dust, acid rain, pollutants and the like in the environment can generate impact, corrosion and other damaging effects on the automobile paint, thereby causing the damage, cracking and dissolution of the automobile paint. Traditional safeguard measure is waxing, polishing on the car lacquer surface, and this kind of mode needs the car to go to maintenance mechanism regularly and maintains, not only brings the trouble for the car owner, still can increase car owner's economic burden. Therefore, in order to reduce the number of times a car goes to a maintenance facility for maintenance, most car owners will extend the use of invisible car cover films after purchasing a new car.
At present, the substrate layer-polyurethane TPU for the invisible car clothing film, which is the mainstream in the market, is a thermoplastic organic high polymer material with a carbon-carbon bond as a basic structure, belongs to a combustible substance, and does not have a flame retardant property. The invisible car coat film is extremely easy to burn when being damaged by an external firework fire source, and causes certain fire spread. Therefore, the flammable or flame-retardant common car cover film brings great potential safety hazard to the vehicles and related personnel provided with the invisible car cover film. Therefore, the flame retardancy of the invisible car cover film must be strictly considered at the initial stage of product design. Generally, a widely used flame retardant technology for polyurethane TPU materials is the additional addition of liquid or solid flame retardants. In order to achieve a certain level of flame retardant effect, the additive flame retardant is often added in a large amount, and the weight ratio of the additive flame retardant is usually more than 15%. However, while the flame retardant property is ensured, the mechanical property and the wear resistance of the material are greatly influenced and reduced, and the surface of the material is easy to have the migration of the flame retardant, so that the flame retardant effect is reduced and the environment is polluted.
For example, the invention of application No. 201710415363.5 discloses an anti-dripping transparent flame retardant TPU and a preparation method thereof, wherein the flame retardant TPU material comprises, by weight, 85-95 parts of a thermoplastic polyurethane elastomer, 6-13 parts of a flame retardant DIDOPO, 0.1-1 part of an anti-dripping agent, 0.5 part of an antioxidant and 0.1 part of a transparent flame retardant synergist which are used as preparation raw materials. Similar to the additive flame retardant means, the flame retardant property of the additive flame retardant can be ensured at the initial stage of the product, but because the additive flame retardant also has the plasticizing effect, the additive flame retardant gradually migrates and precipitates from the surface in the long-term use process, and the flame retardant effect is finally completely lost.
In conclusion, the problem to be solved in the field of automobile coating films is to provide a polyurethane TPU substrate layer which achieves flame retardant performance and has good mechanical properties and weather resistance.
Disclosure of Invention
In order to solve the problems, the invention provides a polyurethane flame-retardant film which can overcome the technical defect that the existing invisible car cover film is flammable or has general flame-retardant performance, and has excellent mechanical properties while ensuring the flame-retardant effect.
The technical scheme of the invention is as follows:
a polyurethane flame-retardant film comprises the following raw materials in parts by weight:
83-98 parts by weight of aliphatic TPU particles;
1-16 parts of flame-retardant cross-linking agent;
1-4.5 parts of an auxiliary agent;
wherein the tensile strength of the polyurethane flame-retardant film is 20-45Mpa, the tearing strength is 75-85N/mm, the hardness is 80-95shore A, and the flame-retardant grade is UL94 VTM-0.
Further, the aliphatic TPU particles have a hardness of 80 to 95Shore A.
Further, the thickness of the polyurethane flame-retardant film is 100-200 mu m.
Further, the flame-retardant cross-linking agent is a polyurethane prepolymer obtained by polymerization reaction of isocyanate and polyether diol, and the content of-NCO groups in the polyurethane prepolymer is 8-20 wt%, based on the total weight of the polyurethane prepolymer; the polyether diol is a reaction type phosphate diol containing phosphorus and nitrogen with a hydroxyl value of 220-500mgKOH/g, wherein the phosphorus content is 6-15 percent, and the nitrogen content is 5-10 percent.
Further, in the flame-retardant crosslinking agent, the isocyanate is dicyclohexylmethane diisocyanate (H)12MDI)。
Furthermore, the urethane bond-CONH-in the aliphatic TPU and the end-NCO group in the flame-retardant cross-linking agent are subjected to intramolecular cross-linking reaction, so that the original linear thermoplastic TPU molecules are combined into thermosetting TPU macromolecules through chemical bonds, and the corresponding mechanical property is obviously improved. The thermosetting macromolecule can be represented by the following structural schematic:
further, the auxiliary agent includes at least one of an antioxidant, an ultraviolet absorber, and an anti-dripping agent.
Further, the antioxidant is at least one of a compound antioxidant B215 and a compound antioxidant B225. The antioxidant has the functions of providing long-acting thermal stability and mechanical property in the crosslinking reaction of the aliphatic TPU particles and the flame-retardant crosslinking agent in a high-temperature environment, and further ensuring the environmental yellowing resistance of the polyurethane flame-retardant film in the using process.
Further, the ultraviolet absorbent is a composite high-efficiency liquid ultraviolet absorbent capable of absorbing ultraviolet light in the wavelength band of 240-355nm and is selected from at least one of UV-1164 and UV-196. The ultraviolet absorbent is easy to add and disperse, and the strong absorption waveband of the ultraviolet absorbent is 300-330nm, so that the long-term weather resistance of the polyurethane flame-retardant film in the using process can be effectively ensured.
Further, the anti-dripping agent is modified polytetrafluoroethylene. In the combustion process of the polyurethane flame-retardant film, the anti-dripping agent can accelerate the film carbon forming rate, play a role in surface crusting protection and reduce flame spread, so that the dripping phenomenon cannot be continued, and the flame-retardant technical requirement for a vehicle film substrate is met.
Furthermore, the weight portion of the antioxidant is 0.5-1.5, the weight portion of the ultraviolet absorbent is 0.5-1.5, and the weight portion of the anti-dripping agent is 0.5-1.5.
The invention also provides a preparation method of the polyurethane flame-retardant film, which comprises the following steps:
(1) preparing a flame-retardant cross-linking agent: weighing the raw materials according to the weight ratio, heating polyether diol in a reaction kettle to 100-110 ℃, carrying out reduced pressure dehydration for 2-3 hours, then introducing inert gas into the reaction kettle, reducing the temperature to 50-55 ℃ under normal pressure, adding isocyanate, controlling the prepolymerization temperature to 80-90 ℃, and reacting for 2-3 hours to obtain the flame-retardant crosslinking agent;
(2) aliphatic TPU crosslinking reaction: mixing the following components in percentage by weight (83-98): (1-16): (1-4.5) adding the aliphatic TPU particles, the flame-retardant cross-linking agent and the auxiliary agent into a screw extruder for blending, melting, cross-linking and extruding to obtain a molten aliphatic TPU material;
(3) polyurethane flame retardant film: and carrying out tape casting molding and cooling setting on the obtained molten aliphatic TPU material to obtain the polyurethane flame-retardant film.
Further, in the step (2), the plasticizing temperature of the extruder body of the screw extruder is 30-80 ℃, 80-145 ℃, 145-200 ℃, 180-245 ℃, 180-220 ℃ and 170-210 ℃ in sequence from the feeding end to the head, the crosslinking reaction time is 1-3 minutes, and the rotation speed of the screw is 20-45 rpm.
Further, in the step (3), the molten aliphatic TPU material is cast to the surface of a cooling roller through a casting die to be cooled and formed into a film, wherein the temperature of the casting die is sequentially 150-.
Further, the preparation method also comprises the step (3) of carrying out a calendering process on the aliphatic TPU material subjected to the casting molding through a calender;
further, the preparation method further comprises the step of performing an edge cutting process on the polyurethane flame-retardant film after the step (3) to obtain a thickness of 100-200 μm, wherein the pressure is 120-2。
The invention also provides application of the polyurethane flame-retardant film as a base material layer of the invisible car clothing film.
The technical scheme provided by the invention can have the following beneficial effects:
1. the invention adopts a structural flame-retardant technology, and the used flame-retardant cross-linking agent is a polyurethane prepolymer of-NCO group end capping and phosphorus-nitrogen containing reaction type phosphate ester dihydric alcohol chain segment. The phosphorus-nitrogen-containing reactive phosphate dihydric alcohol has excellent flame retardance, and the polyurethane prepolymer with the flame retardance is directly bonded into the side chain of the aliphatic TPU molecule through chemical reaction by utilizing an intramolecular cross-linking method. Compared with the conventional flame retardant technology that the additive flame retardant is added into the aliphatic TPU substrate, the flame retardant effect of the polyurethane flame retardant film cannot lose effectiveness due to the prolonging of time, and the phenomenon that the additive flame retardant migrates to the surface of the film along with the increase of the using time to cause the subsequent reduction of the flame retardant performance is avoided; moreover, the content of the flame-retardant cross-linking agent is lower than the common content (more than 15%) of the additive flame retardant, the flame-retardant grade of the final polyurethane film can reach UL94 VTM-0 only by using the lower content of the flame-retardant cross-linking agent, and the reduction of the mechanical property of the polyurethane film caused by the plasticizing effect of the additional additive flame retardant usually can be avoided.
2. The invention provides a polyurethane flame-retardant film, which is formed by performing intramolecular crosslinking reaction on a flame-retardant crosslinking agent serving as a special additive when the flame-retardant crosslinking agent is blended and melted with aliphatic TPU particles, chemically modifying the conventional aliphatic TPU, converting the thermoplastic aliphatic TPU into thermosetting polyurethane with more excellent performance, and forming a film through procedures of tape casting, cooling and the like, so that the density of an aliphatic TPU substrate is improved, and gaps among molecules are reduced, thereby obviously improving the mechanical property, the weather resistance and the like compared with the conventional aliphatic TPU substrate.
3. Compared with the unmodified linear aliphatic TPU substrate, the modified polyurethane substrate with the crosslinking structure has the advantages that the mechanical properties are remarkably improved, for example, the hardness is 80-95Shore A, the tensile strength is 20-45Mpa, the improvement is about 100%, the tear strength is 75-85N/mm, and the improvement is about 36%.
4. The basic raw material adopted by the invention is aliphatic TPU granules with the hardness range of 80-95Shore A, namely never-yellowing aliphatic TPU, the molecular arrangement density of the aliphatic TPU granules is several times that of aromatic TPU, and a coating layer and a glue layer can be tightly combined with the aliphatic TPU granules, so that the coating layer and the glue layer are not easy to delaminate and warp, and the stable performance can be maintained for a long time; in addition, due to the special molecular structure of the aliphatic TPU material, the aliphatic TPU material can resist sun exposure for a long time and does not generate yellowing, and can also keep a stable structure in high and low temperature environments and is not easy to be corroded and soaked by foreign matters.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Example 1
A polyurethane flame-retardant film comprises the following raw materials in parts by weight:
aliphatic TPU particles: 86.6 parts by weight of a hardness of 80Shore A
Flame-retardant crosslinking agent: 12 parts by weight
Antioxidant: 0.6 part of compound antioxidant B215
Ultraviolet absorber: UV-196, 0.8 part by weight
The preparation method of the polyurethane flame-retardant film comprises the following steps:
1) preparing a flame-retardant cross-linking agent:
heating 35.3g of phosphate ester dihydric alcohol (with the hydroxyl value of 440mgKOH/g) in a reaction kettle to 100 ℃, decompressing and dewatering for 2 hours, then introducing nitrogen into the reaction kettle, reducing the temperature to 50 ℃ under normal pressure, adding 64.7g of dicyclohexylmethane diisocyanate, controlling the prepolymerization temperature to 90 ℃, and reacting for 2.5 hours to prepare a polyurethane prepolymer with the-NCO content of 10 weight percent, namely a flame-retardant crosslinking agent;
2) aliphatic TPU crosslinking reaction:
adding the prepared flame-retardant cross-linking agent in the step 1), aliphatic TPU particles, an antioxidant and an ultraviolet absorber into a screw extruder according to the parts by weight for blending, melting, cross-linking and extruding to obtain a molten aliphatic TPU material, wherein the plasticizing temperature of a machine body of the screw extruder is room temperature, 100 ℃, 150 ℃, 220 ℃, 200 ℃ and 180 ℃ in sequence from a feeding end to a machine head, the cross-linking reaction time is 2 minutes, and the rotating speed of a screw is 35 rpm;
3) polyurethane flame retardant film:
continuously casting the molten aliphatic TPU material by a casting die, calendering by a calender to the surface of a cooling roller for cooling and film forming, and then cutting edges to obtain the 150 mu m polyurethane flame-retardant film, wherein the temperature of the casting die is 163 ℃, 175 ℃, 187 ℃, 195 ℃ and 205 ℃ from left to right, the temperature of the cooling roller is 18 ℃, the traction rate is 83m/min, and the implementation pressure in the edge cutting process is 150kg/m2。
Example 2
A polyurethane flame-retardant film comprises the following raw materials in parts by weight:
aliphatic TPU particles: 84 parts by weight of a high hardness resin having a Shore A hardness of 85
Flame-retardant crosslinking agent: 15 parts by weight of
Antioxidant: 0.5 part of composite antioxidant B225
Ultraviolet absorber: UV-1164, 0.5 weight portion
The preparation method of the polyurethane flame-retardant film comprises the following steps:
1) preparing a flame-retardant cross-linking agent:
heating 35.3g of phosphate ester dihydric alcohol (with the hydroxyl value of 480mgKOH/g) in a reaction kettle to 110 ℃, decompressing and dewatering for 2 hours, then introducing nitrogen into the reaction kettle, reducing the temperature to 55 ℃ under normal pressure, adding 75g of dicyclohexylmethane diisocyanate, controlling the prepolymerization temperature to 80 ℃, and reacting for 2.5 hours to prepare a polyurethane prepolymer with the-NCO content of 16 weight percent, namely a flame-retardant crosslinking agent;
2) aliphatic TPU crosslinking reaction:
adding the prepared flame-retardant cross-linking agent in the step 1), aliphatic TPU particles, an antioxidant and an ultraviolet absorber into a screw extruder according to the parts by weight for blending, melting, cross-linking and extruding to obtain a molten aliphatic TPU material, wherein the plasticizing temperature of a machine body of the screw extruder is room temperature, 100 ℃, 150 ℃, 220 ℃, 200 ℃ and 180 ℃ in sequence from a feeding end to a machine head, the cross-linking reaction time is 3 minutes, and the rotating speed of a screw is 35 rpm;
3) polyurethane flame retardant film:
continuously casting the molten aliphatic TPU material by a casting die, calendering by a calender to the surface of a cooling roller for cooling and film forming, and then cutting edges to obtain the 160 mu m polyurethane flame-retardant film, wherein the temperature of the casting die is 170 ℃, 175 ℃, 189 ℃, 200 ℃ and 210 ℃ from left to right in sequence, the temperature of the cooling roller is 15 ℃, the traction rate is 85/min, and the implementation pressure in the edge cutting process is 165kg/m2。
The polyurethane flame-retardant films prepared in the above examples 1 and 2 and the polyurethane film before modification (uncrosslinked polyurethane film) were subjected to the following performance tests, and the test results are shown in table 1:
1. the tensile strength and the elongation at break are tested according to the GB/T1040.3-2006 standard;
2. the tear strength test is carried out according to the GB/T16578.1-2008 standard;
3. the flame retardant test was carried out according to UL94-1996 VTM standard;
4. the yellowing resistance test was performed according to HGI 3689-2001 standard.
TABLE 1 results of performance test of the polyurethane flame retardant films of examples 1 and 2 and the polyurethane film before modification
Based on the data in table 1, the present invention can be seen from the fact that the conventional aliphatic TPU is chemically modified by subjecting the flame retardant crosslinking agent and the aliphatic TPU particles to an intramolecular crosslinking reaction, so that the thermoplastic aliphatic TPU is converted into a thermosetting polyurethane with more excellent properties. Compared with the polyurethane film before modification, the flame retardant grade of the modified polyurethane film with the crosslinking structure reaches UL94 VTM-0, and the mechanical properties are remarkably improved, for example, the hardness is 80-95shore A, the tensile strength is 20-45Mpa, the tensile strength is improved by about 100%, the tear strength is 75-85N/mm, and the tear strength is improved by about 36%.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (7)
1. The flame-retardant polyurethane film is characterized by comprising the following raw materials in parts by weight:
83-98 parts by weight of aliphatic TPU particles;
1-16 parts of flame-retardant cross-linking agent;
1-4.5 parts of an auxiliary agent;
the flame-retardant cross-linking agent is a polyurethane prepolymer obtained by polymerization reaction of isocyanate and polyether diol, and the content of-NCO groups in the polyurethane prepolymer is 8-20 wt%, based on the total weight of the polyurethane prepolymer;
the polyether diol is a reaction type phosphate diol containing phosphorus and nitrogen with a hydroxyl value of 220-500mgKOH/g, wherein the phosphorus content is 6-15 percent, and the nitrogen content is 5-10 percent;
the isocyanate is dicyclohexylmethane diisocyanate;
wherein the tensile strength of the polyurethane flame-retardant film is 20-45Mpa, the tearing strength is 75-85N/mm, the hardness is 80-95shore A, and the flame-retardant grade is UL94 VTM-0.
2. The flame retardant polyurethane film of claim 1 wherein the auxiliary agent comprises at least one of an antioxidant, a uv absorber, and an anti-drip agent.
3. The flame retardant polyurethane film of claim 2, wherein the antioxidant is at least one of a complex antioxidant B215 and a complex antioxidant B225.
4. The polyurethane flame retardant film of claim 2, wherein the ultraviolet absorber is at least one of UV-1164 and UV-196.
5. The flame retardant polyurethane film of claim 2 wherein the anti-drip agent is modified polytetrafluoroethylene.
6. A method for preparing a polyurethane flame-retardant film according to any one of claims 1 to 5, comprising the steps of:
(1) preparing a flame-retardant cross-linking agent: weighing the raw materials according to the weight ratio, heating polyether diol in a reaction kettle to 100-110 ℃, carrying out reduced pressure dehydration for 2-3 hours, then introducing inert gas into the reaction kettle, reducing the temperature to 50-55 ℃ under normal pressure, adding isocyanate, controlling the prepolymerization temperature to 80-90 ℃, and reacting for 2-3 hours to obtain the flame-retardant crosslinking agent;
(2) aliphatic TPU crosslinking reaction: mixing the following components in percentage by weight (83-98): (1-16): (1-4.5) adding the aliphatic TPU particles, the flame-retardant cross-linking agent and the auxiliary agent into a screw extruder for blending, melting, cross-linking and extruding to obtain a molten aliphatic TPU material;
(3) polyurethane flame retardant film: and carrying out tape casting molding and cooling setting on the obtained molten aliphatic TPU material to obtain the polyurethane flame-retardant film.
7. Use of the polyurethane flame retardant film of any of claims 1 to 5 as a substrate layer of a stealth car cover film.
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