Gel electrochromic liquid

Abstract

A formula of the gel electrochromic liquid comprises the following components in parts by weight: 2-5 parts of a gel monomer and 95-98 parts of an electrolyte, wherein the gel monomer is polyvinylidene fluoride or / and polyacrylonitrile; and the electrolyte is one of Y-butyrolactone, ethylene carbonate, propylene carbonate, acetonitrile, N, N-dimethylformamide and N, N-dimethylacetamide. The electrochromic liquid has the advantages that the monomer is directly adopted to form the gel, and the monomer can meet the requirement that the electrochromic liquid is in a gel state at the normal use temperature, becomes liquid along with the temperature rise at the high temperature, and has the characteristic of forming the gel after the temperature is increased; the gel electrochromic liquid prepared according to the formula of the method not only meets the requirement of the automobile electrochromic liquid for the brightness of the anti-dazzling rearview mirror, but also can prevent the phenomenon of migration of an off-color material caused by long-time electrification of a gel system, so that the service life of the automobile rearview mirror is effectively prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of automobile rearview mirror manufacturing, in particular to a gel electrochromic liquid that can be used in an electrochromic rearview mirror. Background Art

[0002] Electrochromic liquid can be used in electrochromic rearview mirrors. When powered on, it can change the color of the rearview mirror to achieve an anti-glare effect. Currently, there are two forms of electrochromic liquid. One is electrochromic liquid that is formed into a circulated state by adding a viscosity agent, such as polymethyl methacrylate as a thickener, which improves the brightness of the EC liquid and slows down the color difference caused by the migration of electrons to the two poles in the electrochromic material due to long-term operation; the other is a gel-state electrochromic liquid using polyurethane resins, but it will not be able to recover after high-temperature decomposition.

[0003] There is a Chinese invention patent application with application number CN202311448502.6 and titled "A method for preparing a polymer gel electrolyte solution and its application in assembling a flexible electrochromic device". It discloses a method for preparing a polymer gel electrolyte solution and its application in assembling a flexible electrochromic device. The purpose of the invention is to solve the problems of insufficient ion conductivity, insufficient flexibility, poor transparency of the gel electrolyte prepared by the existing method, insufficient bending resistance, uneven film, and poor cycle stability of the flexible electrochromic device. The polymer gel electrolyte solution prepared by the invention is based on hydroxyethyl methacrylate and ethylene glycol dimethacrylate as the initial matrix. On this basis, butyl acrylate and acrylic acid are introduced to enhance the performance of the electrolyte film, and lithium salts and plasticizers are introduced. Then, by combining the ProDOT-2HT polymer electrochromic layer and the PEDOT:PSS polymer ion storage layer, a large-area high-performance electrochromic device is quickly prepared. However, this method still does not solve the problem that polyester materials cannot be recovered after high-temperature decomposition, so this method needs to be further improved. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a gel electrochromic liquid which is in a gel state at normal use temperature, flows into liquid at high temperature, and has the ability to form a gel again when the temperature returns to normal.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: the gel electrochromic liquid is characterized in that: its formula is 2 to 5 parts of gel monomer and 95 to 98 parts of electrolyte, and the parts are parts by weight; wherein the gel monomer is polyvinylidene fluoride and / or polyacrylonitrile; the electrolyte is one of γ-butyrolactone, ethylene carbonate, propylene carbonate, acetonitrile, N,N-dimethylformamide, and N,N-dimethylacetamide.

[0006] As an improvement, the formula also includes 0.05 to 5 parts of a 4,4'-bipyridine disubstituted derivative containing a double bond and 0.001 to 0.5 mol of dimethylphenazine, where the parts are parts by weight.

[0007] As an improvement, in its formula, the gel monomer is 3 parts and the electrolyte is 97 parts.

[0008] Further improvement, the molecular formula of the polyvinylidene fluoride is,

[0009] Further improvement, the molecular formula of the polyacrylonitrile is,

[0010] Further improved, the molecular formula of the 4,4'-bipyridine disubstituted derivative is, Wherein R1 is an alkyl group, R2 is Cl - Br - 、BF4 - PF6 - One of them.

[0011] Further improvement, the molecular formula of the dimethylphenazine is,

[0012] As an improvement, the preparation method of the gel electrochromic liquid comprises the following steps:

[0013] 1. Heat and dissolve 2 to 5 parts of gel monomer into the electrolyte to prepare 100 parts of a mixed solution;

[0014] 2. Add 0.05-5 parts of a 4,4'-bipyridine disubstituted derivative containing a double bond and 0.001-0.5 mol of dimethylphenazine to the mixed solution;

[0015] 3. The mixed solution is allowed to stand until the temperature returns to room temperature, thus completing the preparation of the gel electrochromic liquid.

[0016] Further improvement, in step one, the heating temperature is 170-180° C., and the heating time is 30-60 minutes.

[0017] As an improvement, the method for pouring the gel electrochromic liquid comprises the following steps:

[0018] A. heating the gel electrochromic liquid to 75-92° C. to make the gel electrochromic liquid in a solution state;

[0019] B. pouring the gel electrochromic liquid in a solution state into the electrochromic liquid receiving cavity of the automobile rearview mirror;

[0020] C. The electrochromic liquid receiving cavity is sealed, thereby completing the filling operation of the gel electrochromic liquid.

[0021] Compared with the prior art, the advantages of the present invention are: the present invention directly adopts monomers to form a gel, and the monomers can satisfy the requirement that the electrochromic liquid is in a gel state at normal use temperature, and becomes a liquid as the temperature rises at high temperature, but has the characteristic of forming a gel again after returning to the temperature; the gel electrochromic liquid prepared by the formula of the method not only meets the brightness requirements of the automobile electrochromic liquid for the anti-glare rearview mirror, but also can achieve the gel system to prevent the migration of the color-changing material caused by long-term power-on, thereby effectively extending the service life of the automobile rearview mirror. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the embodiments.

[0023] The gel electrochromic liquid of the first embodiment has a formula of 2 parts of gel monomer and 98 parts of electrolyte, where the parts are parts by weight; wherein the gel monomer is polyvinylidene fluoride; and the electrolyte is gamma-butyrolactone.

[0024] The molecular formula of polyvinylidene fluoride is,

[0025] The gel electrochromic liquid of the second embodiment has a formula of 2 parts of gel monomer, 98 parts of electrolyte, 0.05 parts of 4,4'-bipyridine disubstituted derivative containing double bonds, and 0.001 parts of dimethylphenazine, where the parts are parts by weight; wherein the gel monomer is polyvinylidene fluoride; and the electrolyte is vinyl carbonate.

[0026] The molecular formula of polyvinylidene fluoride is,

[0027] The molecular formula of 4,4'-bipyridine disubstituted derivatives is, Where R1 is an alkyl group and R2 is Br - .

[0028] The molecular formula of dimethylphenazine is,

[0029] The preparation method of the gel electrochromic liquid comprises the following steps:

[0030] 1. Heat and dissolve 2 parts of gel monomer into the electrolyte to prepare 100 parts of a mixed solution;

[0031] 2. Add 0.05 parts of a 4,4'-bipyridine disubstituted derivative containing a double bond and 0.001 mol of dimethylphenazine into the mixed solution;

[0032] 3. The mixed solution is allowed to stand until the temperature returns to room temperature, thereby completing the preparation of the gel electrochromic liquid.

[0033] In step 1, the heating temperature is 170-180° C., and the heating time is 30-60 minutes.

[0034] The method for pouring the gel electrochromic liquid comprises the following steps:

[0035] A. heating the gel electrochromic liquid to 75-92° C. to make the gel electrochromic liquid in a solution state;

[0036] B. pouring the gel electrochromic liquid in a solution state into the electrochromic liquid receiving cavity of the automobile rearview mirror;

[0037] C. The electrochromic liquid receiving cavity is sealed, thereby completing the filling operation of the gel electrochromic liquid.

[0038] The gel electrochromic liquid of the third embodiment has a formula of 2 parts of gel monomer, 98 parts of electrolyte, 0.05 parts of 4,4'-bipyridine disubstituted derivative containing double bonds, and 0.001 parts of dimethylphenazine, where the parts are parts by weight; wherein the gel monomer is polyacrylonitrile; and the electrolyte is propylene carbonate.

[0039] The molecular formula of polyacrylonitrile is,

[0040] The molecular formula of 4,4'-bipyridine disubstituted derivatives is, Wherein R1 is an alkyl group, R2 is

[0041] The molecular formula of dimethylphenazine is,

[0042] The preparation method of the gel electrochromic liquid comprises the following steps:

[0043] 1. Heat and dissolve 2 parts of gel monomer into the electrolyte to prepare 100 parts of a mixed solution;

[0044] 2. Add 0.05 parts of a 4,4'-bipyridine disubstituted derivative containing a double bond and 0.001 mol of dimethylphenazine into the mixed solution;

[0045] 3. The mixed solution is allowed to stand until the temperature returns to room temperature, thereby completing the preparation of the gel electrochromic liquid.

[0046] In step 1, the heating temperature is 170-180° C., and the heating time is 30-60 minutes.

[0047] The method for pouring the gel electrochromic liquid comprises the following steps:

[0048] A. heating the gel electrochromic liquid to 75-92° C. to make the gel electrochromic liquid in a solution state;

[0049] B. pouring the gel electrochromic liquid in a solution state into the electrochromic liquid receiving cavity of the automobile rearview mirror;

[0050] C. The electrochromic liquid receiving cavity is sealed, thereby completing the filling operation of the gel electrochromic liquid.

[0051] In order to fully liquefy the gel electrochromic liquid, the heating temperature is usually 80°C.

[0052] The gel electrochromic liquid of the fourth embodiment has a formula of 3 parts of gel monomer, 97 parts of electrolyte, 0.05 parts of 4,4'-bipyridine disubstituted derivative containing double bonds, and 0.001 parts of dimethylphenazine, where the parts are parts by weight; wherein the gel monomer is polyacrylonitrile; and the electrolyte is acetonitrile.

[0053] The molecular formula of polyacrylonitrile is,

[0054] The molecular formula of 4,4'-bipyridine disubstituted derivatives is, Where R1 is alkyl and R2 is Cl - .

[0055] The molecular formula of dimethylphenazine is,

[0056] The preparation method of the gel electrochromic liquid comprises the following steps:

[0057] 1. Heat and dissolve 3 parts of gel monomer into the electrolyte to prepare 100 parts of a mixed solution;

[0058] 2. Add 0.05 parts of a 4,4'-bipyridine disubstituted derivative containing a double bond and 0.001 mol of dimethylphenazine into the mixed solution;

[0059] 3. The mixed solution is allowed to stand until the temperature returns to room temperature, thereby completing the preparation of the gel electrochromic liquid.

[0060] In step 1, the heating temperature is 170-180° C., and the heating time is 30-60 minutes.

[0061] The method for pouring the gel electrochromic liquid comprises the following steps:

[0062] A. heating the gel electrochromic liquid to 75-92° C. to make the gel electrochromic liquid in a solution state;

[0063] B. pouring the gel electrochromic liquid in a solution state into the electrochromic liquid receiving cavity of the automobile rearview mirror;

[0064] C. The electrochromic liquid receiving cavity is sealed, thereby completing the filling operation of the gel electrochromic liquid.

[0065] In order to fully liquefy the gel electrochromic liquid, the heating temperature is usually 80°C.

[0066] The gel electrochromic liquid of the fifth embodiment has a formula of 5 parts of gel monomer, 95 parts of electrolyte, 5 parts of 4,4'-bipyridine disubstituted derivative containing double bonds, and 0.5 parts of dimethylphenazine, where the parts are parts by weight; wherein the gel monomer is polyacrylonitrile; and the electrolyte is N,N-dimethylformamide.

[0067] The molecular formula of polyacrylonitrile is,

[0068] The molecular formula of 4,4'-bipyridine disubstituted derivatives is, Where R1 is an alkyl group and R2 is BF4 - .

[0069] The molecular formula of dimethylphenazine is,

[0070] The preparation method of the gel electrochromic liquid comprises the following steps:

[0071] 1. Heat and dissolve 5 parts of gel monomer into the electrolyte to prepare 100 parts of a mixed solution;

[0072] 2. Add 5 parts of 4,4'-bipyridine disubstituted derivatives containing double bonds and 0.5 mol of dimethylphenazine into the mixed solution;

[0073] 3. The mixed solution is allowed to stand until the temperature returns to room temperature, thereby completing the preparation of the gel electrochromic liquid.

[0074] In step 1, the heating temperature is 170-180° C., and the heating time is 30-60 minutes.

[0075] The method for pouring the gel electrochromic liquid comprises the following steps:

[0076] A. heating the gel electrochromic liquid to 75-92° C. to make the gel electrochromic liquid in a solution state;

[0077] B. pouring the gel electrochromic liquid in a solution state into the electrochromic liquid receiving cavity of the automobile rearview mirror;

[0078] C. The electrochromic liquid receiving cavity is sealed, thereby completing the filling operation of the gel electrochromic liquid.

[0079] In order to fully liquefy the gel electrochromic liquid, the heating temperature is usually 80°C.

[0080] The gel electrochromic liquid of the sixth embodiment has a formula of 5 parts of gel monomer, 95 parts of electrolyte, 5 parts of 4,4'-bipyridine disubstituted derivative containing double bonds, and 0.5 parts of dimethylphenazine, where the parts are parts by weight; wherein the gel monomer is polyvinylidene fluoride; and the electrolyte is N,N-dimethylacetamide.

[0081] The molecular formula of polyvinylidene fluoride is,

[0082] The molecular formula of 4,4'-bipyridine disubstituted derivatives is, Where R1 is an alkyl group and R2 is PF6 - .

[0083] The molecular formula of dimethylphenazine is,

[0084] The preparation method of the gel electrochromic liquid comprises the following steps:

[0085] 1. Heat and dissolve 5 parts of gel monomer into the electrolyte to prepare 100 parts of a mixed solution;

[0086] 2. Add 5 parts of 4,4'-bipyridine disubstituted derivatives containing double bonds and 0.5 mol of dimethylphenazine into the mixed solution;

[0087] 3. The mixed solution is allowed to stand until the temperature returns to room temperature, thereby completing the preparation of the gel electrochromic liquid.

[0088] In step 1, the heating temperature is 170-180° C., and the heating time is 30-60 minutes.

[0089] The method for pouring the gel electrochromic liquid comprises the following steps:

[0090] A. heating the gel electrochromic liquid to 75-92° C. to make the gel electrochromic liquid in a solution state;

[0091] B. pouring the gel electrochromic liquid in a solution state into the electrochromic liquid receiving cavity of the automobile rearview mirror;

[0092] C. The electrochromic liquid receiving cavity is sealed, thereby completing the filling operation of the gel electrochromic liquid.

[0093] In order to fully liquefy the gel electrochromic liquid, the heating temperature is usually 80°C.

[0094] Working principle: The gel electrochromic liquid produced by the present invention is in a gel state below 70°C and in a liquid state above 70°C. After heating, the temperature returns to below 70°C and the mixed liquid becomes a gel state again, which meets the actual needs of the electrochromic liquid. It only liquefies but does not decompose at high temperatures and can still be used normally after the temperature drops, thereby extending the service life of the electrochromic liquid.

Claims

1. A gel electrochromic liquid, characterized in that: The formula is 2-5 parts of gel monomer and 95-98 parts of electrolyte, where the parts are by weight; wherein the gel monomer is polyvinylidene fluoride and / or polyacrylonitrile; and the electrolyte is one of gamma-butyrolactone, ethylene carbonate, propylene carbonate, acetonitrile, N,N-dimethylformamide and N,N-dimethylacetamide.

2. The gel electrochromic liquid according to claim 1, characterized in that: The formula also includes 0.05 to 5 parts of a 4,4'-bipyridine disubstituted derivative containing a double bond and 0.001 to 0.5 mol of dimethylphenazine, where the parts are by weight.

3. The gel electrochromic liquid according to claim 2, characterized in that: In its formula, the gel monomer is 3 parts and the electrolyte is 97 parts.

4. The gel electrochromic liquid according to claim 3, characterized in that: The molecular formula of the polyvinylidene fluoride is, 5. The gel electrochromic liquid according to claim 3, characterized in that: The molecular formula of the polyacrylonitrile is, 6. The gel electrochromic liquid according to claim 2, characterized in that: The molecular formula of the 4,4'-bipyridine disubstituted derivative is: Wherein R1 is an alkyl group, R2 is Cl - Br - 、BF4 - PF6 - One of them.

7. The gel electrochromic liquid according to claim 2, characterized in that: The molecular formula of the dimethylphenazine is, 8. The gel electrochromic liquid according to any one of claims 1 to 7, characterized in that: The preparation method of the gel electrochromic liquid comprises the following steps:

1. Heat and dissolve 2 to 5 parts of gel monomer into the electrolyte to prepare 100 parts of a mixed solution; 2. Add 0.05-5 parts of a 4,4'-bipyridine disubstituted derivative containing a double bond and 0.001-0.5 mol of dimethylphenazine to the mixed solution; 3. The mixed solution is allowed to stand until the temperature returns to room temperature, thus completing the preparation of the gel electrochromic liquid.

9. The gel electrochromic liquid according to claim 8, characterized in that: In step 1, the heating temperature is 170-180° C., and the heating time is 30-60 minutes.

10. The gel electrochromic liquid according to any one of claims 1 to 7, characterized in that: The method for pouring the gel electrochromic liquid comprises the following steps: A. heating the gel electrochromic liquid to 75-92° C. to make the gel electrochromic liquid in a solution state; B. pouring the gel electrochromic liquid in a solution state into the electrochromic liquid receiving cavity of the automobile rearview mirror; C. The electrochromic liquid receiving cavity is sealed, thereby completing the filling operation of the gel electrochromic liquid.

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