A high and low temperature black and white film

Abstract

This invention relates to a high- and low-temperature black-and-white film, comprising a black film and a white film stacked together. The raw materials for preparing the black film include, by weight, the following components: 40-60 parts diisocyanate, 60-80 parts polyol, 5-15 parts lignin, 3-10 parts chain extender, 0.01-1 part catalyst, and 15-50 parts black filler. The raw materials for preparing the white film include diisocyanate, triisocyanate, polyol, chain extender, catalyst, chitosan, chloroprene rubber, and white filler. The high- and low-temperature black-and-white film of this invention possesses excellent overall performance, combining high and low temperature resistance, water resistance, and weather resistance, making it suitable for applications such as encapsulation, home textiles, and greenhouses.

Description

Technical Field

[0001] This invention relates to the field of polyurethane technology, and more particularly to a high and low temperature black and white film. Background Technology

[0002] In encapsulation, home textiles, or greenhouses, there is a need for black and white films that perform well in both high and low temperature environments to meet the requirements of different natural environmental temperatures.

[0003] CN101531877A discloses a high- and low-temperature resistant and hydrolysis-resistant one-component polyurethane adhesive and its preparation method. The adhesive, by mass percentage, consists of: 40%–65% organosilicon polyurethane modified prepolymer, 10%–20% solvent, 1%–15% chain extender, and 20%–40% filler. The liquid components are first mixed evenly, then the solid components are added and stirred until homogeneous. The mixture is then ground in a grinder and packaged. This disclosed high- and low-temperature resistant and hydrolysis-resistant one-component polyurethane adhesive possesses high-temperature resistance, ultra-low-temperature resistance, and water resistance. It can withstand a 400-degree temperature difference between 200°C and -240°C, and can be used long-term at -200°C. It is mainly used for bonding materials in areas of LNG ships where temperature variations are significant. However, this disclosed one-component polyurethane adhesive uses a large amount of high-cost components and is not suitable for applications such as packaging, home textiles, or greenhouses where cost control is crucial.

[0004] CN113527996A discloses a high- and low-temperature resistant water-based peelable protective coating. Its components, by weight, include 60-85 parts of a water-based anionic aliphatic polyether polyurethane dispersion, 3-10 parts of acrylic emulsion, 1-6 parts of an anti-sticking and slip-inducing agent, 0.1-0.8 parts of a defoamer, 0.1-0.5 parts of a leveling agent, 0.2-1 parts of a thickener, and 1-10 parts of a film-forming aid. The prepared high- and low-temperature resistant water-based peelable protective coating is a thermoplastic, single-component, room-temperature curing film-forming coating. It can be applied not only to various metal plates but also to epoxy coatings, polyurethane coatings, acrylic coatings, and other organic coatings. The peelable protective coating maintains long-term intact peelability at 60℃ and exhibits good film flexibility without becoming brittle at -20℃, possessing excellent water resistance and weather resistance. However, the disclosed coating is intended for use as a temporary protective coating.

[0005] In conclusion, it is crucial to develop a high- and low-temperature black and white film with excellent resistance to high and low temperatures, water resistance, and weather resistance. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a high-low temperature black and white film that combines high and low temperature resistance, water resistance, and weather resistance, exhibiting excellent overall performance and suitable for applications such as encapsulation, home textiles, or greenhouses.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a high-low temperature black and white film, the high-low temperature black and white film comprising a black film and a white film stacked together;

[0009] The raw materials for preparing the black film include the following components in parts by weight:

[0010]

[0011] The raw materials for preparing the white film include diisocyanate, triisocyanate, polyol, chain extender, catalyst, chitosan, chloroprene rubber and white filler.

[0012] In this invention, the high and low temperature black and white film includes a black film and a white film, which are stacked together. The black film is prepared by introducing lignin, a complex polymer formed from three alcohol monomers (p-coumarol, coniferyl alcohol, and sinapyl alcohol). Its structure contains active groups such as aromatic groups, phenolic hydroxyl groups, alcoholic hydroxyl groups, and carbonyl groups, which can participate in the polycondensation reaction of polyurethane, thus improving the high and low temperature resistance and weather resistance of the black film. The white film is prepared by using chitosan and chloroprene rubber in combination. Chitosan has strong intramolecular and intermolecular hydrogen bonding, regular molecular chains, and excellent crystallinity. Chloroprene rubber has excellent weather resistance and heat resistance, but slightly poor low-temperature resistance. The combination of these two materials improves the high and low temperature resistance of the white film while ensuring its water resistance and weather resistance. Simultaneously, the combination of triisocyanate and diisocyanate reduces the regularity of the polymer chain structure, lowers the glass transition temperature of the polymer, and further improves its low-temperature resistance.

[0013] In this invention, the high and low temperature black and white film formed by the above-mentioned black film and white film has excellent comprehensive performance and low cost.

[0014] In this invention, the high and low temperature black and white film refers to a film layer with good performance at both high and low temperatures. Specifically, high temperature refers to above 50°C and low temperature refers to below 0°C.

[0015] In this invention, the diisocyanate is in the form of 40-60 parts by weight, such as 42 parts, 44 parts, 46 parts, 48 ​​parts, 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, etc.

[0016] The polyol is in the form of 60-80 parts by weight, such as 62, 64, 66, 68, 70, 72, 74, 76, 78, etc.

[0017] The lignin is present in 5-15 parts by weight, such as 6, 7, 8, 9, 10, 11, 12, 13, 14, etc.

[0018] The chain extender is present in 3-10 parts by weight, such as 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, etc.

[0019] The catalyst is present in parts by weight of 0.01-1 parts, for example, 0.01 parts, 0.02 parts, 0.05 parts, 0.1 parts, 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, etc.

[0020] The black filler is present in parts by weight of 15-50, for example, 15 parts, 20 parts, 22 parts, 30 parts, 40 parts, 50 parts, etc.

[0021] Preferably, the thickness of the black film and the white film is (1-5):1, where 1-5 can be 2.5, 3, 3.5, 4, 4.5, etc.

[0022] Preferably, the diisocyanate comprises any one or a combination of at least two of toluene diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), hexamethylene diisocyanate (HDI), or lysine diisocyanate (LDI). Typical but non-limiting combinations include: a combination of toluene diisocyanate and isophorone diisocyanate; a combination of isophorone diisocyanate, diphenylmethane diisocyanate, and dicyclohexylmethane diisocyanate; a combination of diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and lysine diisocyanate, etc.

[0023] Preferably, the polyol comprises a polyether polyol.

[0024] In this invention, the chain structure of polyether polyol is soft, which can reduce the defects of insufficient system toughness caused by a small amount of lignin and improve the overall performance of high and low temperature black and white films.

[0025] Preferably, the polyether polyol includes any one or a combination of at least two of polypropylene glycol, polypropylene triol, or polytetrahydrofuran diol, wherein typical but non-limiting combinations include: a combination of polypropylene glycol and polypropylene triol, a combination of polypropylene triol and polytetrahydrofuran diol, a combination of polypropylene glycol, polypropylene triol, and polytetrahydrofuran diol, etc.

[0026] Preferably, the chain extender includes an amine chain extender.

[0027] Preferably, the amine chain extender includes any one or a combination of at least two of ethylenediamine, diethylenediamine, or triethylenetetramine, wherein typical but non-limiting combinations include: a combination of ethylenediamine and diethylenediamine, a combination of diethylenediamine and triethylenetetramine, a combination of ethylenediamine, diethylenediamine, and triethylenetetramine, etc.

[0028] Preferably, the catalyst comprises any one or a combination of at least two of the following: a triazine trimerizing catalyst, an organobismuth, tetra-n-butyltin dibutyl, or tin dilaurate. Typical but non-limiting combinations include: a combination of a triazine trimerizing catalyst and an organobismuth, a combination of an organobismuth, tetra-n-butyltin dibutyl, and tin dilaurate, and a combination of a triazine trimerizing catalyst, an organobismuth, tetra-n-butyltin dibutyl, and tin dilaurate.

[0029] Preferably, the black filler comprises carbon black.

[0030] Preferably, the white film comprises the following components in parts by weight:

[0031]

[0032] In this invention, the diisocyanate is present in 20-30 parts by weight, such as 22 parts, 24 parts, 26 parts, 28 parts, etc.

[0033] The triisocyanate is present in parts by weight of 20-30, or in parts by weight of 22, 24, 26, 28, etc.

[0034] The polyol is in the form of 70-90 parts by weight, for example, 72 parts, 74 parts, 76 parts, 78 parts, 80 parts, 82 parts, 84 parts, 86 parts, 88 parts, etc.

[0035] The chain extender is present in 3-10 parts by weight, such as 4 parts, 6 parts, 8 parts, etc.

[0036] The catalyst is present in parts by weight of 0.01-1 parts, for example, 0.02 parts, 0.05 parts, 0.1 parts, 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, etc.

[0037] The chitosan is present in 5-10 parts by weight, such as 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, etc.

[0038] The chloroprene rubber is in the form of 5-15 parts by weight, such as 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, etc.

[0039] The white filler is present in parts by weight of 15-50, for example, 15 parts, 20 parts, 22 parts, 30 parts, 40 parts, 50 parts, etc.

[0040] Preferably, the diisocyanate comprises any one or a combination of at least two of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, or lysine diisocyanate. Typical but non-limiting combinations include: a combination of toluene diisocyanate and isophorone diisocyanate; a combination of isophorone diisocyanate, diphenylmethane diisocyanate, and dicyclohexylmethane diisocyanate; a combination of diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and lysine diisocyanate, etc.

[0041] Preferably, the triisocyanate comprises 4,4',4” triphenylmethane triisocyanate.

[0042] Preferably, the polyol comprises a polyester polyol.

[0043] Preferably, the polyester polyol comprises polycaprolactone polyol and / or polycarbonate diol.

[0044] Preferably, the chain extender comprises any one or a combination of at least two of 1,4-butanediol, glycerol, diethylene glycol, triethylene glycol, ethylenediamine, or N,N-dihydroxy(diisopropyl)aniline, wherein typical but non-limiting combinations include: a combination of 1,4-butanediol and glycerol, a combination of diethylene glycol, triethylene glycol, and ethylenediamine, a combination of triethylene glycol, ethylenediamine, and N,N-dihydroxy(diisopropyl)aniline, etc.

[0045] Preferably, the catalyst comprises any one or a combination of at least two of the following: a triazine trimerizing catalyst, an organobismuth, tetra-n-butyltin dibutyl, or tin dilaurate. Typical but non-limiting combinations include: a combination of a triazine trimerizing catalyst and an organobismuth, a combination of an organobismuth, tetra-n-butyltin dibutyl, and tin dilaurate, and a combination of a triazine trimerizing catalyst, an organobismuth, tetra-n-butyltin dibutyl, and tin dilaurate.

[0046] Preferably, the white filler comprises calcium carbonate and / or white carbon black.

[0047] Preferably, the raw materials for preparing the black film and the white film each independently include an amphiphilic polymer.

[0048] In this invention, an amphiphilic polymer is incorporated into the black and white films. This not only increases the compatibility of the components in each film layer and improves the stability of each film layer, but also enhances the interaction between the two film layers, thereby further improving the weather resistance and water resistance of the black and white films.

[0049] Preferably, in the raw materials for preparing the black film and the white film, the weight parts of the amphiphilic polymer are each 1-5 parts, for example 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, etc.

[0050] In a second aspect, the present invention provides a method for preparing a low-temperature black and white film according to the first aspect, the method comprising the following steps:

[0051] (1) Mix diisocyanate, polyol, lignin, chain extender, catalyst and black filler, process to form a black film;

[0052] (2) Mix diisocyanate, triisocyanate, polyol, chain extender, catalyst, chitosan, chloroprene rubber and white filler, process them, and set them on one side of the black film to form a white film, thus obtaining a high and low temperature black and white film.

[0053] Preferably, step (1) specifically includes: first mixing diisocyanate, polyol and catalyst to perform prepolymerization, then mixing with chain extender, lignin and black filler to perform polymerization, and processing to obtain a black film.

[0054] Preferably, the prepolymerization temperature is 40-100℃, such as 50℃, 60℃, 70℃, 80℃, 90℃, etc.

[0055] Preferably, the prepolymerization time is 2-5 hours, such as 2.5 hours, 3 hours, 3.5 hours, 4 hours, 4.5 hours, etc.

[0056] Preferably, the polymerization temperature is 110-150℃, such as 115℃, 120℃, 125℃, 130℃, 135℃, 140℃, 145℃, etc.

[0057] Preferably, the polymerization time is 3-8 hours, such as 4 hours, 5 hours, 6 hours, 7 hours, etc.

[0058] Preferably, the prepolymer is further mixed with an amphiphilic polymer.

[0059] Preferably, step (2) specifically includes: first mixing diisocyanate, triisocyanate, polyol and catalyst for prepolymerization, then mixing with chain extender, chitosan, chloroprene rubber and white filler, processing, and setting on one side of the black film to obtain a white film.

[0060] Preferably, the prepolymer is further mixed with an amphiphilic polymer.

[0061] Preferably, the prepolymerization temperature is 40-100℃, such as 50℃, 60℃, 70℃, 80℃, 90℃, etc.

[0062] Preferably, the prepolymerization time is 2-5 hours, such as 2.5 hours, 3 hours, 3.5 hours, 4 hours, 4.5 hours, etc.

[0063] Preferably, the polymerization temperature is 110-150℃, such as 115℃, 120℃, 125℃, 130℃, 135℃, 140℃, 145℃, etc.

[0064] Preferably, the polymerization time is 3-8 hours, such as 4 hours, 5 hours, 6 hours, 7 hours, etc.

[0065] As a preferred technical solution, the preparation method includes the following steps:

[0066] (1) First, mix diisocyanate, polyol and catalyst, prepolymerize at 40-100℃ for 2-5h, then mix with chain extender, lignin, amphiphilic polymer and black filler, polymerize at 110-150℃ for 3-8h, process to form black film;

[0067] (2) First, diisocyanate, triisocyanate, polyol and catalyst are mixed and prepolymerized at 40-100℃ for 2-5h. Then, chain extender, chitosan, chloroprene rubber, amphiphilic polymer and white filler are mixed and polymerized at 110-150℃ for 3-8h. The mixture is placed on one side of the black film to form a white film, thus obtaining the high and low temperature black and white film.

[0068] Thirdly, the present invention provides a high and low temperature black and white film as described in the first aspect for use in packaging, home textiles, or greenhouses.

[0069] Compared with the prior art, the present invention has the following beneficial effects:

[0070] (1) The high and low temperature black and white film of the present invention has the properties of high and low temperature resistance, water resistance and weather resistance, and has excellent comprehensive performance. It is suitable for packaging, home textiles or greenhouses, etc.

[0071] (2) The high and low temperature black and white film of the present invention has a tensile strength of more than 29 MPa at room temperature, a retention rate of more than 78% at 80℃ and a retention rate of more than 73% at -20℃; and an elongation at break of more than 455%, a retention rate of more than 80% at 80℃ and a retention rate of more than 71% at -20℃. Detailed Implementation

[0072] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0073] The sources of some of the raw materials in the various embodiments of the present invention are as follows:

[0074] Polypropylene glycol: purchased from Wuhan Fuxinyuan Technology Co., Ltd., CAS No. 25322-69-4;

[0075] Polypropylene triol: purchased from Jinjinle Chemical Co., Ltd.;

[0076] Polytetrahydrofuran diol: purchased from Sigma-Aldrich (Shanghai) Trading Co., Ltd.

[0077] Polycaprolactone polyol: purchased from Hubei Chengfeng Chemical Co., Ltd., CAS No. 37625-56-2;

[0078] Polycarbonate diol; purchased from Wuhan Jixin Yibang Biotechnology Co., Ltd., CAS No. 29862-10-0;

[0079] Organic bismuth: purchased from Shanghai Coleman Reagent Co., Ltd., grade 093411;

[0080] Amphiphilic polymer A: mPEG-b-PCL amphiphilic block polymer, purchased from Guangzhou Carbon Water Co., Ltd., grade 80010402;

[0081] Amphiphilic polymer B: P(LA-co-CA)-mPEG, purchased from Xi'an Ruixi Biotechnology Co., Ltd.;

[0082] Lignin: Purchased from Wuhan Fengyao Tonghui Chemical Products Co., Ltd., CAS No. 8068-03-9;

[0083] Chitosan: Purchased from Sigma-Aldrich (Shanghai) Trading Co., Ltd., grade C3646-100G;

[0084] Chloroprene rubber: purchased from Hubei Shishun Biotechnology Co., Ltd.

[0085] Examples 1-3

[0086] The raw material composition of the high and low temperature black and white films described in Examples 1-3 is shown in Table 1:

[0087] Table 1

[0088]

[0089]

[0090] The thickness ratios of the black film and the white film described in Examples 1-3 are 3:1, 1:1, and 5:1, respectively.

[0091] The high and low temperature black and white films described in Examples 1-3 were prepared by the following method, which includes the following steps:

[0092] (1) First, mix diisocyanate, polyol and catalyst, heat to 50°C, prepolymerize for 1 hour, heat to 80°C, prepolymerize for 1 hour, then mix with chain extender, lignin, amphiphilic polymer and black filler, polymerize at 110°C for 2 hours, heat to 120°C, polymerize for 1 hour, heat to 140°C, polymerize for 1.5 hours, calender to form a black film;

[0093] (2) First, diisocyanate, triisocyanate, polyol and catalyst are mixed and heated to 40°C for 2 hours of prepolymerization. Then, the temperature is raised to 60°C, 70°C and 80°C respectively, and each reaction is carried out for 0.5 hours. Then, chain extender, chitosan, chloroprene rubber, amphiphilic polymer and white filler are mixed and polymerized at 120°C for 3 hours. Then, the temperature is raised to 140°C and 160°C respectively, and each reaction is carried out for 2 hours. The mixture is calendered on one side of the black film to form a white film, thus obtaining the high and low temperature black and white film.

[0094] Example 4

[0095] The difference between this embodiment and Embodiment 1 is that the raw materials used to prepare the black film do not include amphiphilic polymers; otherwise, they are the same as in Embodiment 1.

[0096] Example 5

[0097] The difference between this embodiment and Embodiment 1 is that the raw materials used to prepare the black and white films do not include amphiphilic polymers; otherwise, they are the same as in Embodiment 1.

[0098] Example 6

[0099] The difference between this embodiment and Example 1 is that the polyether polyol in the black film is replaced with an equal mass of polycaprolactone polyol, while the rest is the same as in Example 1.

[0100] Example 7

[0101] The difference between this embodiment and Embodiment 1 is that the polyester polyol in the white film is replaced with an equal mass of polyoxypropylene triol; all other aspects are the same as in Embodiment 1.

[0102] Comparative Example 1

[0103] The difference between this comparative example and Example 1 is that the raw materials used to prepare the black film do not include lignin; otherwise, they are the same as in Example 1.

[0104] Comparative Example 2

[0105] The difference between this comparative example and Example 1 is that the chitosan in the raw materials for preparing the white film is replaced with an equal mass of chloroprene rubber; all other aspects are the same as in Example 1.

[0106] Comparative Example 3

[0107] The difference between this comparative example and Example 1 is that the chloroprene rubber in the raw materials for preparing the white film is replaced with an equal mass of chitosan; all other aspects are the same as in Example 1.

[0108] Performance testing

[0109] The high and low temperature black and white films described in Examples 1-7 and Comparative Examples 1-3 were subjected to the following tests:

[0110] (1): Mechanical properties: Tensile strength and elongation at break are tested in accordance with GB / T 528-2009. When testing mechanical properties, the temperature of the specimens is room temperature, 80℃ and -20℃ respectively. The specific test values ​​are given at room temperature, and the retention ratios of tensile strength or elongation at break are converted at 80℃ and -20℃.

[0111] (3) Weather resistance: After irradiation for 240 hours under ultraviolet light intensity of 400 μW / cm2, the appearance morphology of the black and white film was observed. No change was grade 1, slight cracks were grade 2, moderate cracks were grade 2, and severe cracks were grade 3.

[0112] (4) Water resistance: After soaking in water for 24 hours, observe the appearance of the black and white film. No change is grade 1, slight swelling is grade 2, moderate swelling is grade 3, and severe swelling is grade 4.

[0113] The test results are summarized in Table 2.

[0114] Table 2

[0115]

[0116]

[0117] Analysis of the data in Table 2 shows that the high and low temperature black and white film of the present invention has a tensile strength of over 29 MPa at room temperature, a retention rate of over 78% at 80℃, and a retention rate of over 73% at -20℃; the elongation at break is over 455%, a retention rate of over 80% at 80℃, and a retention rate of over 71% at -20℃; the high and low temperature black and white film of the present invention has excellent high and low temperature resistance, as well as excellent water resistance and weather resistance.

[0118] Analysis of Comparative Example 1 and Example 1 shows that the performance of Comparative Example 1 is not as good as that of Example 1, proving that the high and low temperature black and white film formed by setting lignin in the black film has better performance.

[0119] Analysis of Comparative Examples 2-3 and Example 1 shows that the performance of Comparative Examples 2-3 is not as good as that of Example 1, proving that the high and low temperature black and white films formed by chitosan and chloroprene rubber in the white film have better performance.

[0120] Analysis of Examples 4-5 and Example 1 shows that the performance of Examples 4-5 is not as good as that of Example 1, proving that the high and low temperature black and white films formed by setting amphiphilic polymers in the black and white films have better performance.

[0121] Analysis of Example 6 and Example 1 shows that the performance of Example 6 is not as good as that of Example 1, proving that the high and low temperature black and white film formed by polyether polyol is better when preparing the black film.

[0122] Analysis of Example 7 and Example 1 shows that the performance of Example 7 is not as good as that of Example 1, proving that the high and low temperature black and white film formed by polyester polyol is better when preparing the white film.

[0123] The present invention has been illustrated with the above embodiments to explain the detailed method of the present invention. However, the present invention is not limited to the detailed method described above, that is, it does not mean that the present invention must rely on the detailed method described above to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A high-low temperature black and white film, characterized in that, The high and low temperature black and white film includes a black film and a white film stacked together. The raw materials for preparing the black film include the following components in parts by weight: 40-60 parts of diisocyanate 60-80 parts of polyether polyol 5-15 parts lignin 3-10 parts of chain extender Catalyst 0.01-1 part 15-50 parts of black filler 1-5 parts of amphiphilic polymer; The raw materials for preparing the white film include the following components in parts by weight: 20-30 parts of diisocyanate 20-30 parts of triisocyanate 70-90 parts of polyester polyol 3-10 parts of chain extender Catalyst 0.01-1 part 5-10 parts chitosan 5-15 parts of chloroprene rubber 15-50 parts of white filler 1-5 parts of amphiphilic polymer.

2. The high and low temperature black and white film according to claim 1, characterized in that, The thickness of the black film and the white film is (1-5):

1.

3. The high and low temperature black and white film according to claim 1, characterized in that, The diisocyanate in the raw materials for preparing the black film includes any one or a combination of at least two of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, or lysine diisocyanate.

4. The high and low temperature black and white film according to claim 1, characterized in that, The polyether polyol includes any one or a combination of at least two of polypropylene glycol, polypropylene triol, or polytetrahydrofuran diol.

5. The high and low temperature black and white film according to claim 1, characterized in that, The chain extenders in the raw materials for preparing the black film include amine chain extenders.

6. The high and low temperature black and white film according to claim 5, characterized in that, The amine chain extender includes any one or a combination of at least two of ethylenediamine, diethylenediamine, or triethylenetetramine.

7. The high and low temperature black and white film according to claim 1, characterized in that, The catalyst in the raw materials for preparing the black film includes any one or a combination of at least two of the following: triazine trimerizing catalyst, organic bismuth, tetra-n-butyltin dibutyl or tin dilaurate.

8. The high and low temperature black and white film according to claim 1, characterized in that, The black filler includes carbon black.

9. The high and low temperature black and white film according to claim 1, characterized in that, The diisocyanate in the raw materials for preparing the white film includes any one or a combination of at least two of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, or lysine diisocyanate.

10. The high and low temperature black and white film according to claim 1, characterized in that, The triisocyanate includes 4,4',4'' triphenylmethane triisocyanate.

11. The high and low temperature black and white film according to claim 1, characterized in that, The polyester polyols include polycaprolactone polyols and / or polycarbonate diols.

12. The high and low temperature black and white film according to claim 1, characterized in that, The chain extender in the raw materials for preparing the white film includes any one or a combination of at least two of 1,4-butanediol, glycerol, diethylene glycol, triethylene glycol, ethylenediamine, or N,N-dihydroxy(diisopropyl)aniline.

13. The high and low temperature black and white film according to claim 1, characterized in that, The catalyst in the raw materials for preparing the white film includes any one or a combination of at least two of the following: triazine trimerizing catalyst, organic bismuth, tetra-n-butyltin dibutyl or tin dilaurate.

14. The high and low temperature black and white film according to claim 1, characterized in that, The white filler includes calcium carbonate and / or white carbon black.

15. The high and low temperature black and white film according to any one of claims 1-14, characterized in that, The method for preparing the low-temperature black and white film includes the following steps: (1) Mix diisocyanate, polyol, lignin, chain extender, catalyst, amphiphilic polymer and black filler, process to form a black film; (2) Mix diisocyanate, triisocyanate, polyol, chain extender, catalyst, chitosan, chloroprene rubber, amphiphilic polymer and white filler, process and set on one side of black film to form white film, and obtain high and low temperature black and white film.

16. The high and low temperature black and white film according to claim 15, characterized in that, The specific steps (1) include: first mixing diisocyanate, polyol and catalyst for prepolymerization, then mixing with chain extender, lignin and black filler for polymerization and processing to obtain black film.

17. The high and low temperature black and white film according to claim 16, characterized in that, The prepolymerization temperature is 40-100℃.

18. The high and low temperature black and white film according to claim 16, characterized in that, The prepolymerization time is 2-5 hours.

19. The high and low temperature black and white film according to claim 16, characterized in that, The polymerization temperature is 110-150℃.

20. The high and low temperature black and white film according to claim 16, characterized in that, The polymerization time is 3-8 hours.

21. The high and low temperature black and white film according to claim 16, characterized in that, The prepolymerization process also includes mixing with an amphiphilic polymer.

22. The high and low temperature black and white film according to claim 15, characterized in that, The specific steps (2) include: first, mixing diisocyanate, triisocyanate, polyol and catalyst to prepolymerize, then mixing with chain extender, chitosan, chloroprene rubber and white filler, processing, and setting on one side of the black film to obtain a white film.

23. The high and low temperature black and white film according to claim 22, characterized in that, The prepolymerization process also includes mixing with an amphiphilic polymer.

24. The high and low temperature black and white film according to claim 22, characterized in that, The prepolymerization temperature is 40-100℃.

25. The high and low temperature black and white film according to claim 22, characterized in that, The prepolymerization time is 2-5 hours.

26. The high and low temperature black and white film according to claim 15, characterized in that, The preparation method includes the following steps: (1) First, mix diisocyanate, polyol and catalyst, prepolymerize at 40-100℃ for 2-5 h, then mix with chain extender, lignin, amphiphilic polymer and black filler, polymerize at 110-150℃ for 3-8 h, process to form black film; (2) First, diisocyanate, triisocyanate, polyol and catalyst are mixed and prepolymerized at 40-100℃ for 2-5 h. Then, chain extender, chitosan, chloroprene rubber, amphiphilic polymer and white filler are mixed and polymerized at 110-150℃ for 3-8 h. The mixture is placed on one side of the black film to form a white film, thus obtaining the high and low temperature black and white film.

27. The high and low temperature black and white film according to any one of claims 1-14, characterized in that, The high and low temperature black and white film is used for packaging, home textiles, or greenhouses.

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