Trans-polymer dispersed liquid crystal dimming film composition, trans-polymer dispersed liquid crystal dimming film and preparation method of trans-polymer dispersed liquid crystal dimming film

Abstract

The invention provides a trans-polymer dispersed liquid crystal dimming film composition, a trans-polymer dispersed liquid crystal dimming film and a preparation method of the trans-polymer dispersed liquid crystal dimming film. The composition is prepared from the following components in parts by mass: 40 to 70 parts of negative nematic liquid crystal; 15-45 parts of a polymer liquid crystal monomer; 5 to 30 parts of an acrylate prepolymer; 0.1 to 2 parts of a nanometer material; 0.1 to 0.5 part of a spacer; the negative nematic liquid crystal, the polymer liquid crystal monomer and the acrylate prepolymer are 100 parts in total, and the nano material is selected from one or a combination of more than two of nano zirconium oxide, nano silicon dioxide and nano zinc oxide. According to the invention, the trans-PDLC is doped with a trace amount of nano-zirconia, so that the micro-deformation resistance of the polymer can be improved, the influence of the polymer on the haze of the membrane under high-temperature and high-pressure conditions is small, and the trans-PDLC has temperature resistance and pressure resistance.

Description

Technical Field

[0001] The invention relates to a trans polymer dispersed liquid crystal dimming film composition, a trans polymer dispersed liquid crystal dimming film and a preparation method thereof, and belongs to the technical field of liquid crystal dimming films. Background Art

[0002] Polymer dispersed liquid crystal (PDLC) is a material formed by mixing liquid crystal molecules with monomers and prepolymers through polymerization. The basic process is that the liquid crystal and polymer undergo phase separation to form liquid crystal droplets dispersed in the polymer matrix.

[0003] When no electric field is applied to the forward PDLC, the directors of the liquid crystal molecules are irregularly distributed, and the refractive index of the liquid crystal does not match the refractive index of the polymer, resulting in light scattering and a foggy film. When an electric field is applied, the long axis of the liquid crystal molecules is parallel to the electric field, and the refractive index of the liquid crystal matches the refractive index of the polymer, so no scattering occurs and the film appears transparent. However, since scenes such as architectural glass or car windows need to maintain a transparent state for a long time, the forward PDLC needs to be continuously powered, which will cause a lot of energy loss, thereby increasing the cost of use.

[0004] Inverse PDLC adds an orientation layer and uses negative liquid crystal. When no electric field is applied, the liquid crystal molecules are vertically aligned under the action of the orientation layer, the liquid crystal refractive index matches the polymer refractive index, no scattering occurs, and the film appears transparent. When an electric field is applied, the long axis of the liquid crystal molecules is aligned perpendicular to the electric field, the liquid crystal refractive index does not match the polymer refractive index, scattering occurs, and the film appears foggy.

[0005] After the trans-PDLC dimming glass is treated in an autoclave, its off-state haze may increase. This is because under high temperature and high pressure conditions, the polymer strength of the trans-PDLC decreases and deforms, and its thermal stability is relatively poor, which disrupts the arrangement of liquid crystal molecules, causing the refractive index of the liquid crystal and polymer to mismatch, causing scattering and making the film hazy.

[0006] In view of this, it is of great significance to provide a trans-PDLC to improve the polymer's resistance to micro-deformation at high temperature and high pressure. Summary of the invention

[0007] In order to solve the above technical problems, the purpose of the present invention is to provide a trans polymer dispersed liquid crystal dimming film composition, a trans polymer dispersed liquid crystal dimming film and a preparation method thereof, and to dope a trace amount of nano zirconium oxide into the trans PDLC to improve the polymer's ability to resist micro-deformation, so that it has less effect on the haze of the membrane under high temperature and high pressure conditions.

[0008] To achieve the above object, in a first aspect, the present invention provides a trans-polymer dispersed liquid crystal dimming film composition, wherein the composition comprises the following components in parts by mass:

[0009] Negative nematic liquid crystal: 40-70 parts;

[0010] Polymer liquid crystal monomer: 15-45 parts;

[0011] Acrylate prepolymer: 5-30 parts;

[0012] Nanomaterials: 0.1-2 parts;

[0013] Spacer: 0.1-0.5 parts;

[0014] The negative nematic liquid crystal, polymer liquid crystal monomer and acrylate prepolymer are 100 parts in total; the nano material is selected from one or a combination of two or more of nano zirconium oxide, nano silicon dioxide and nano zinc oxide.

[0015] According to a specific embodiment of the present invention, preferably, the composition comprises the following components in parts by mass:

[0016] Negative nematic liquid crystal: 50-70 parts;

[0017] Polymer liquid crystal monomer: 15-35 parts;

[0018] Acrylate prepolymer: 5-15 parts;

[0019] Nanomaterials: 0.5-1.5 parts;

[0020] Spacer: 0.1-0.3 parts;

[0021] The negative nematic liquid crystal, polymer liquid crystal monomer and acrylate prepolymer are 100 parts in total;

[0022] The nano material is selected from nano zirconium oxide.

[0023] The nano zirconium oxide of the present invention is a white powder. By adding the nano zirconium oxide to the trans-PDLC, the anti-micro deformation ability of the polymer can be improved, so that the polymer will hardly deform under high pressure, and the liquid crystal molecules will not be vertically arranged due to the disturbance of polymer deformation. Since the refractive index of the nano zirconium oxide itself is relatively high, excessive addition will not disperse well, resulting in obvious scattering, and the initial haze of the film will be relatively large.

[0024] According to a specific embodiment of the present invention, preferably, the polymer liquid crystal monomer is a monofunctional liquid crystal monomer; the clearing point of the polymer liquid crystal monomer is below 70° C. The polymer liquid crystal monomer has a low clearing point and is monofunctional, so the anchoring force of the polymer on the liquid crystal is weak and the driving voltage is also low.

[0025] According to a specific embodiment of the present invention, for the above-mentioned monofunctional liquid crystal monomer, a specific example may be:

[0026] 4'-(6-(Acryloyloxy)hexyloxy)biphenylnitrile, referred to as A6OCB, has the structural formula:

[0027]

[0028] Alternatively, 4'-(6-acryloyloxyhexyloxy)biphenyl-4-carboxylic acid, referred to as BP, has the structural formula:

[0029]

[0030] According to a specific embodiment of the present invention, preferably, the negative nematic liquid crystal is an existing conventional negative nematic liquid crystal, which is generally used for a liquid crystal birefringence Δn≥0.2 of a dimming film.

[0031] According to a specific embodiment of the present invention, preferably, the acrylate prepolymer is one or a combination of two or more of polyurethane acrylate, epoxy resin acrylate, polyester acrylate and unsaturated acrylate; the viscosity of the acrylate prepolymer is below 1000cps, more preferably 100cps-1000cps.

[0032] According to a specific embodiment of the present invention, preferably, the particle size of the nanomaterial is less than 500 nm, more preferably 50 nm-500 nm.

[0033] According to a specific embodiment of the present invention, preferably, the trans-polymer dispersed liquid crystal dimming film composition further contains a photoinitiator, and the content of the photoinitiator is 1%-5% of the total mass of the polymer liquid crystal monomer and the acrylate prepolymer. More preferably, the photoinitiator includes one or a combination of two or more of diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide (TPO), butyl benzophenone, 2,2-dimethoxy-2-phenylacetophenone (IRG651), hydroxydimethylacetophenone (photoinitiator 1173), etc.

[0034] According to a specific embodiment of the present invention, preferably, the spacer is a silica microsphere or a resin microsphere.

[0035] According to a specific embodiment of the present invention, preferably, the diameter of the spacer is less than 10 μm, more preferably 5 μm-10 μm.

[0036] In a second aspect, the present invention further provides a method for preparing a trans polymer dispersed liquid crystal dimming film, wherein the trans polymer dispersed liquid crystal dimming film composition is mixed, ultrasonicated and stirred to obtain a mixed solution;

[0037] The mixed liquid is pressed into a film, and then subjected to a curing reaction to form a trans-polymer dispersed liquid crystal dimming film.

[0038] According to a specific embodiment of the present invention, preferably, the temperature of the ultrasound is 40-80°C, more preferably 50-70°C, further preferably 60°C.

[0039] According to a specific embodiment of the present invention, preferably, the ultrasonication time is 1-2 hours.

[0040] According to a specific embodiment of the present invention, preferably, the stirring temperature is 130-150°C, more preferably 140°C.

[0041] According to a specific embodiment of the present invention, preferably, the stirring time is 1-2h.

[0042] According to a specific embodiment of the present invention, preferably, the curing reaction comprises: placing the film under an ultraviolet lamp with a wavelength of 365 nm for 2-15 minutes; more preferably, irradiating for 10 minutes.

[0043] In a third aspect, the present invention further provides a trans-polymer dispersed liquid crystal dimming film prepared by the above-mentioned method for preparing the trans-polymer dispersed liquid crystal dimming film.

[0044] According to a specific embodiment of the present invention, preferably, the trans-polymer dispersed liquid crystal dimming film comprises a first electrical substrate, a second electrical substrate, and a polymer substrate;

[0045] Wherein, the polymer substrate contains liquid crystal droplets and nanomaterials;

[0046] The surfaces of the first electric substrate and the second electric substrate are provided with vertical alignment layers, and the liquid crystal droplets are arranged vertically to the first electric substrate and the second electric substrate.

[0047] In a fourth aspect, the present invention further provides a dimming glass comprising the above-mentioned trans-polymer dispersed liquid crystal dimming film.

[0048] According to a specific embodiment of the present invention, the switchable glass can be prepared by the following steps:

[0049] The trans-polymer dispersed liquid crystal dimming film is laminated with two glass plates using an adhesive film, and then subjected to initial pressing and high pressure pressing to obtain dimming glass.

[0050] In the above-mentioned preparation method of dimming glass, initial pressing refers to placing the composite plate in a vacuum bag or putting a vacuum ring around it, heating it at 75°C for 20-30min under a pressure of 0.001-0.01bar, and then heating it at 120°C for 20-30min to obtain the composite plate;

[0051] In the above-mentioned preparation method of dimming glass, high pressure means that the composite plate after initial pressing is placed in an autoclave, a pressure of 10-13 bar is applied, and heating is performed at 130° C.-140° C. for 1-3 hours (preferably 2 hours);

[0052] In the above-mentioned method for preparing the dimming glass, the glass plate used may be glass commonly used in dimming glass.

[0053] In the above-mentioned method for preparing the dimming glass, the adhesive film used may be a commonly used adhesive film such as a PVB film.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] The present invention dopes a trace amount of nano-zirconia and other nano-materials into the trans-PDLC, and the nano-zirconia and other nano-materials are dispersed in the polymer matrix of the trans-PDLC, which can improve the polymer's ability to resist micro-deformation. Therefore, under high pressure, the polymer will hardly deform, and the liquid crystal molecules will not be vertically arranged due to the disturbance of polymer deformation, which has little effect on the haze of the diaphragm, so that the trans-PDLC has temperature and pressure resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a schematic structural diagram of the trans-polymer dispersed liquid crystal dimming film of the present invention.

[0057] Reference numerals:

[0058] 1. polymer substrate; 2. liquid crystal droplets; 3. nano zirconium oxide; 4. spacers; 11. first electrical substrate; 12. second electrical substrate. DETAILED DESCRIPTION

[0059] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is now described in detail below, but it should not be construed as limiting the applicable scope of the present invention.

[0060] Example 1

[0061] This embodiment provides a trans-polymer dispersed liquid crystal dimming film composition, and the composition comprises, in parts by mass:

[0062] Negative nematic liquid crystal with birefringence Δn ≥ 0.2, 70 parts;

[0063] Polymer liquid crystal monomer, 15 parts;

[0064] Polyurethane acrylate prepolymer, 15 parts;

[0065] 0.8 parts of nano zirconium oxide with a particle size of 100-300 nm;

[0066] Spacer with a diameter of 8 μm, 0.2 parts.

[0067] The composition also contains a photoinitiator TPO, the content of which is 2% of the total mass of the polymer liquid crystal monomer and the polyurethane acrylate prepolymer.

[0068] The polymer liquid crystal monomer is 4'-(6-(acryloyloxy)hexyloxy)biphenylnitrile (A6OCB), and the polymer liquid crystal monomers of the following examples and comparative examples are the same.

[0069] This embodiment also provides a trans-polymer dispersed liquid crystal dimming film, which is prepared by the following steps:

[0070] The constituent materials of the above composition are mixed, and then ultrasonicated at 60° C. for 1 hour and mechanically stirred at 140° C. for 1 hour to obtain a mixed solution;

[0071] The obtained mixed solution is injected between the first electric substrate and the second electric substrate and pressed into a thin film;

[0072] The film is placed under a 365nm wavelength ultraviolet lamp for 10 minutes to form a reverse polymer dispersed liquid crystal dimming film.

[0073] The trans-polymer dispersed liquid crystal dimming film is laminated with two glass plates using a PVB adhesive film, and then subjected to initial pressing and high pressure, wherein the initial pressing refers to placing the laminated composite plate into a vacuum bag or putting a vacuum ring around it, heating it at 75°C for 30 minutes under a pressure of 0.001-0.01 bar, and then heating it at 120°C for 30 minutes to obtain a composite plate, and the high pressure refers to placing the composite plate after initial pressing into an autoclave, applying a pressure of 12 bar, and heating it at 135°C for 2 hours to obtain a dimming glass;

[0074] The haze of the dimming film before lamination and the haze of the dimming glass after lamination were tested using a haze meter (BYK 4775 transmission haze meter). The test results are shown in Table 1.

[0075] The structure of the trans-polymer dispersed liquid crystal dimming film is as follows Figure 1As shown, it includes a first electrical substrate 11, a second electrical substrate 12, a polymer substrate 1, liquid crystal droplets 2, nano zirconium oxide 3, and a spacer 4;

[0076] Wherein, liquid crystal droplets 1 and nano zirconium oxide 3 are dispersed in a polymer substrate 1;

[0077] The surfaces of the first electric substrate 11 and the second electric substrate 12 have vertical alignment layers, so that the liquid crystal droplets 2 are arranged vertically to the surfaces of the first electric substrate 11 and the second electric substrate 12 .

[0078] The first electrical substrate 11 and the second electrical substrate 12 are usually made of conductive transparent materials. The conductive layer material can be ITO, which is used to apply an electric field to control the arrangement of liquid crystal molecules and has good electrical properties and optical transmittance. Nano zirconium oxide 3 can improve the mechanical and thermal stability of the film. The spacer 4 is used to maintain the distance between the first electrical substrate 11 and the second electrical substrate 12 to ensure that the thickness of the dimming film is uniform. The liquid crystal and the polymer will undergo a phase separation process after the polymerization reaction, resulting in the liquid crystal being dispersed in the polymer matrix in the form of droplets to form liquid crystal droplets 2 for adjusting light scattering and transmittance.

[0079] Example 2

[0080] This embodiment provides a trans-polymer dispersed liquid crystal dimming film composition, and the composition has the following components in parts by mass:

[0081] Negative nematic liquid crystal with birefringence Δn ≥ 0.2, 60 parts;

[0082] Polymer liquid crystal monomer, 27 parts;

[0083] Polyurethane acrylate prepolymer, 13 parts;

[0084] 1.2 parts of nano zirconium oxide with a particle size of 100-300 nm;

[0085] Spacer with a diameter of 8 μm, 0.2 parts.

[0086] The composition also contains a photoinitiator TPO, the content of which is 2% of the total mass of the polymer liquid crystal monomer and the polyurethane acrylate prepolymer.

[0087] This embodiment also provides a trans-polymer dispersed liquid crystal dimming film, which is prepared by the following steps:

[0088] The constituent materials of the above composition are mixed, and then ultrasonicated at 60° C. for 1 hour and mechanically stirred at 140° C. for 1 hour to obtain a mixed solution;

[0089] The obtained mixed solution is injected between the first electric substrate and the second electric substrate and pressed into a thin film;

[0090] The film is placed under a 365nm wavelength ultraviolet lamp for 10 minutes to form a reverse polymer dispersed liquid crystal dimming film.

[0091] The trans-polymer dispersed liquid crystal dimming film is laminated with two sheets of glass using a PVB adhesive film, and then subjected to initial pressing and high pressure. The initial pressing refers to placing the laminated composite board into a vacuum bag or putting a vacuum ring around it, heating it at 75°C for 30 minutes under a pressure of 0.001-0.01 bar, and then heating it at 120°C for 30 minutes to obtain a composite board. The high pressure refers to placing the composite board after initial pressing into an autoclave, applying a pressure of 12 bar, and heating it at 135°C for 2 hours to obtain a dimming glass.

[0092] The haze meter was used to test the haze of the dimming film before lamination and the haze of the dimming glass after lamination. The test results are shown in Table 1.

[0093] Comparative Example 1

[0094] This comparative example provides a trans-polymer dispersed liquid crystal dimming film composition, and the composition comprises, in parts by mass:

[0095] Negative nematic liquid crystal with birefringence Δn ≥ 0.2, 70 parts;

[0096] Polymer liquid crystal monomer, 15 parts;

[0097] Polyurethane acrylate prepolymer, 15 parts;

[0098] Nano zirconium oxide with a particle size of 100-300 nm, 0 parts;

[0099] Spacer with a diameter of 8 μm, 0.2 parts.

[0100] The composition also contains a photoinitiator TPO, the content of which is 2% of the total mass of the polymer liquid crystal monomer and the polyurethane acrylate prepolymer.

[0101] This comparative example also provides a trans-polymer dispersed liquid crystal dimming film, which is prepared by the following steps:

[0102] The above materials were mixed, and then ultrasonicated at 60°C for 1 hour, and mechanically stirred at 140°C for 1 hour to obtain a mixed solution;

[0103] The obtained mixed solution is injected between the first electric substrate and the second electric substrate and pressed into a thin film;

[0104] The film is placed under a 365nm wavelength ultraviolet lamp for 10 minutes to form a reverse polymer dispersed liquid crystal dimming film.

[0105] The trans-polymer dispersed liquid crystal dimming film is laminated with two sheets of glass using a PVB adhesive film, and then subjected to initial pressing and high pressure. The initial pressing refers to placing the laminated composite board into a vacuum bag or putting a vacuum ring around it, heating it at 75°C for 30 minutes under a pressure of 0.001-0.01 bar, and then heating it at 120°C for 30 minutes to obtain a composite board. The high pressure refers to placing the composite board after initial pressing into an autoclave, applying a pressure of 12 bar, and heating it at 135°C for 2 hours to obtain a dimming glass.

[0106] The haze meter was used to test the haze of the dimming film before lamination and the haze of the dimming glass after lamination. The test results are shown in Table 1.

[0107] Comparative Example 2

[0108] This comparative example provides a trans-polymer dispersed liquid crystal dimming film composition, and the composition comprises, in parts by mass:

[0109] Negative nematic liquid crystal with birefringence Δn ≥ 0.2, 60 parts;

[0110] Polymer liquid crystal monomer, 27 parts;

[0111] Polyurethane acrylate prepolymer, 13 parts;

[0112] Nano zirconium oxide with a particle size of 100-300 nm, 0 parts;

[0113] Spacer with a diameter of 8 μm, 0.2 parts.

[0114] The composition also contains a photoinitiator TPO, the content of which is 2% of the total mass of the polymer liquid crystal monomer and the polyurethane acrylate prepolymer.

[0115] This comparative example also provides a trans-polymer dispersed liquid crystal dimming film, which is prepared by the following steps:

[0116] The above materials were mixed, and then ultrasonicated at 60°C for 1 hour, and mechanically stirred at 140°C for 1 hour to obtain a mixed solution;

[0117] The obtained mixed solution is injected between the first electric substrate and the second electric substrate and pressed into a thin film;

[0118] The film is placed under a 365nm wavelength ultraviolet lamp for 10 minutes to form a reverse polymer dispersed liquid crystal dimming film.

[0119] The trans-polymer dispersed liquid crystal dimming film is laminated with two sheets of glass using a PVB adhesive film, and then subjected to initial pressing and high pressure. The initial pressing refers to placing the laminated composite board into a vacuum bag or putting a vacuum ring around it, heating it at 75°C for 30 minutes under a pressure of 0.001-0.01 bar, and then heating it at 120°C for 30 minutes to obtain a composite board. The high pressure refers to placing the composite board after initial pressing into an autoclave, applying a pressure of 12 bar, and heating it at 135°C for 2 hours to obtain a dimming glass.

[0120] The haze meter was used to test the haze of the dimming film before lamination and the haze of the dimming glass after lamination. The test results are shown in Table 1.

[0121] Comparative Example 3

[0122] This comparative example provides a trans-polymer dispersed liquid crystal dimming film composition, and the composition comprises, in parts by mass:

[0123] Negative nematic liquid crystal with birefringence Δn ≥ 0.2, 70 parts;

[0124] Polymer liquid crystal monomer, 15 parts;

[0125] Polyurethane acrylate prepolymer, 15 parts;

[0126] 4 parts of nano zirconium oxide with a particle size of 100-300 nm;

[0127] Spacer with a diameter of 8 μm, 0.2 parts.

[0128] The composition also contains a photoinitiator TPO, the content of which is 2% of the total mass of the polymer liquid crystal monomer and the polyurethane acrylate prepolymer.

[0129] This comparative example also provides a trans-polymer dispersed liquid crystal dimming film, which is prepared by the following steps:

[0130] The above materials were mixed, and then ultrasonicated at 60°C for 1 hour, and mechanically stirred at 140°C for 1 hour to obtain a mixed solution;

[0131] The obtained mixed solution is injected between the first electric substrate and the second electric substrate and pressed into a thin film;

[0132] The film is placed under a 365nm wavelength ultraviolet lamp for 10 minutes to form a reverse polymer dispersed liquid crystal dimming film.

[0133] The trans-polymer dispersed liquid crystal dimming film is laminated with two sheets of glass using a PVB adhesive film, and then subjected to initial pressing and high pressure. The initial pressing refers to placing the laminated composite board into a vacuum bag or putting a vacuum ring around it, heating it at 75°C for 30 minutes under a pressure of 0.001-0.01 bar, and then heating it at 120°C for 30 minutes to obtain a composite board. The high pressure refers to placing the composite board after initial pressing into an autoclave, applying a pressure of 12 bar, and heating it at 135°C for 2 hours to obtain a dimming glass.

[0134] The haze meter was used to test the haze of the dimming film before lamination and the haze of the dimming glass after lamination. The test results are shown in Table 1.

[0135] Table 1

[0136]

[0137] In Table 1:

[0138] Haze change value = haze of dimming glass after lamination - haze of dimming film before lamination;

[0139] Haze change rate = (haze change value / haze before lamination) × 100%.

[0140] After adding nano zirconium oxide in Example 1-2, the haze of the dimming glass after lamination is very different from the haze of the dimming film before lamination, and the haze change value does not exceed 1.0%. This is because the invention adds nano zirconium oxide to the trans-PDLC, and the nano zirconium oxide enhances the anti-micro deformation ability of the polymer. When laminating and laminating under high pressure conditions, the polymer will hardly deform, and the liquid crystal molecules will not be vertically arranged due to the disturbance of polymer deformation, thereby not affecting the haze of the film.

[0141] However, the haze of the dimming glass of Comparative Example 1-2 after lamination is very different from the haze of the dimming film before lamination, and the haze change value is more than 1 times the haze value of the dimming film before lamination. This shows that without the addition of nano zirconium oxide, the lamination process causes the polymer to deform and the liquid crystal arrangement is disturbed, resulting in an increase in haze.

[0142] Comparative Example 3 adds more nano-zirconium oxide than Examples 1-2, resulting in a relatively high haze of the dimming film before lamination, which has a very adverse effect on the haze of the film.

Claims

1. A trans-polymer dispersed liquid crystal dimming film composition, wherein: The composition comprises the following components in parts by mass: Negative nematic liquid crystal: 40-70 parts; Polymer liquid crystal monomer: 15-45 parts; Acrylate prepolymer: 5-30 parts; Nanomaterials: 0.1-2 parts; Spacer: 0.1-0.5 parts; The negative nematic phase liquid crystal, polymer liquid crystal monomer and acrylate prepolymer are 100 parts in total; the nano material is selected from one or a combination of two or more of nano zirconium oxide, nano silicon dioxide and nano zinc oxide.

2. The trans-polymer dispersed liquid crystal dimming film composition according to claim 1, wherein: The composition comprises the following components in parts by mass: Negative nematic liquid crystal: 50-70 parts; Polymer liquid crystal monomer: 15-35 parts; Acrylate prepolymer: 5-15 parts; Nanomaterials: 0.5-1.5 parts; Spacer: 0.1-0.3 parts; The negative nematic liquid crystal, polymer liquid crystal monomer and acrylate prepolymer are 100 parts in total; The nano material is selected from nano zirconium oxide.

3. The trans-polymer dispersed liquid crystal dimming film composition according to claim 1 or 2, wherein: The polymer liquid crystal monomer is a monofunctional liquid crystal monomer.

4. The trans-polymer dispersed liquid crystal dimming film composition according to claim 3, wherein: The clearing point of the polymer liquid crystal monomer is below 70°C.

5. The trans-polymer dispersed liquid crystal dimming film composition according to claim 1 or 2, wherein: The acrylate prepolymer is one or a combination of two or more of polyurethane acrylate, epoxy resin acrylate, polyester acrylate and unsaturated acrylate.

6. The trans-polymer dispersed liquid crystal dimming film composition according to claim 5, wherein: The viscosity of the acrylic ester prepolymer is less than 1000 cps, preferably 100 cps-1000 cps.

7. The trans-polymer dispersed liquid crystal dimming film composition according to claim 1 or 2, wherein: The particle size of the nanomaterial is below 500 nm, preferably 50 nm-500 nm.

8. The trans-polymer dispersed liquid crystal dimming film composition according to claim 1 or 2, wherein: The reverse polymer dispersed liquid crystal dimming film composition also contains a photoinitiator, and the content of the photoinitiator is 1%-5% of the total mass of the polymer liquid crystal monomer and the acrylate prepolymer.

9. The trans-polymer dispersed liquid crystal dimming film composition according to claim 8, wherein: The photoinitiator includes one or a combination of two or more of trimethylbenzoyl-diphenylphosphine oxide, butyl benzophenone, 2,2-dimethoxy-2-phenylacetophenone, and hydroxydimethylacetophenone.

10. The trans-polymer dispersed liquid crystal dimming film composition according to claim 1, wherein: The spacer is a silica microsphere or a resin microsphere, and / or the diameter of the spacer is less than 10 μm, preferably 5 μm-10 μm.

11. A method for preparing a trans-polymer dispersed liquid crystal dimming film, wherein: Mixing the trans-polymer dispersed liquid crystal dimming film composition according to any one of claims 1 to 10, performing ultrasonication and stirring to obtain a mixed solution; The mixed liquid is pressed into a film, and then subjected to a curing reaction to form a trans-polymer dispersed liquid crystal dimming film.

12. The preparation method according to claim 11, wherein The ultrasonic temperature is 40-80°C, and the ultrasonic time is 1-2h; And / or, the stirring temperature is 130-150° C., and the stirring time is 1-2 h; And / or, the curing reaction includes: placing the film under an ultraviolet lamp with a wavelength of 365nm for 2-15min.

13. A trans-polymer dispersed liquid crystal dimming film prepared by the method for preparing a trans-polymer dispersed liquid crystal dimming film as claimed in claim 11 or 12.

14. The trans-polymer dispersed liquid crystal dimming film according to claim 13, wherein: The reverse polymer dispersed liquid crystal dimming film comprises a first electrical substrate, a second electrical substrate, and a polymer base; Wherein, the polymer substrate contains liquid crystal droplets and nanomaterials; The surfaces of the first electric substrate and the second electric substrate are provided with vertical alignment layers, and the liquid crystal droplets are arranged vertically to the first electric substrate and the second electric substrate. 15 . A dimming glass comprising the trans-polymer dispersed liquid crystal dimming film according to claim 13 or 14 .

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