CN-121976405-A - Dyeing method for automobile film and application thereof

Abstract

The invention belongs to the technical field of dyeing, and relates to a dyeing method of an automobile film and application thereof, wherein the dyeing method comprises the following steps of (1) putting a dye and the automobile film into a dyeing kettle; the dyeing method comprises the steps of (2) injecting carbon dioxide into a dyeing kettle, then heating to 70-130 ℃ and pressurizing to 20-30 MPa for dyeing, and then cooling to finish the dyeing of the automobile film, wherein supercritical carbon dioxide is used as a dyeing medium, and the high permeability and uniform dyeing of the automobile film are realized by optimizing the temperature and pressure parameter ranges in the dyeing process, so that the dyed automobile film has the advantages of uniform dyeing, high color saturation and high color fastness, and meanwhile, the excellent optical performance of the automobile film is not affected, and in addition, the dyeing method also has the advantages of short time consumption, low energy consumption and environmental protection, and can be suitable for various automobile film materials.

Inventors

• WEI MINGCAI
• ZHAO YALI
• LI FEI

Assignees

• 中创绿洁超临界流体科技(江苏)有限公司

Dates

Publication Date

20260505

Application Date

20260202

Claims (10)

1. 1. A method of dyeing an automotive film, the method comprising the steps of: (1) Putting the dye and the automobile film into a dyeing kettle; (2) And injecting carbon dioxide into a dyeing kettle, heating to 70-130 ℃, pressurizing to 20-30 MPa for dyeing, and cooling to finish the dyeing of the automobile film.
2. 2. Dyeing process according to claim 1, characterized in that the dye of step (1) comprises a disperse dye; preferably, the dye is used in the step (1) in an amount of 0.2 to 7%, more preferably 0.5 to 5% based on 100% by mass of the automobile film in the step (1).
3. 3. Dyeing process according to claim 1 or 2, characterized in that the carbon dioxide is used in step (2) in an amount not lower than 500% based on 100% of the mass of the automotive film in step (1).
4. 4. A dyeing method according to any one of claims 1 to 3, wherein the step (1) of placing the automotive film in a dyeing tank further comprises a step of washing and drying the automotive film.
5. 5. The dyeing method according to any one of claims 1 to 4, wherein the thickness of the automobile film in the step (1) is 0.01 to 1 mm; Preferably, the material of the automobile film in the step (1) comprises any one or a combination of at least two of thermoplastic polyurethane elastomer, polyethylene terephthalate, polyamide or polypropylene.
6. 6. The dyeing method according to any one of claims 1 to 5, wherein the dyeing time in step (2) is 20 to 130 min, preferably 40 to 120 min; preferably, the temperature of the cooled system in the step (2) is not higher than 70 ℃.
7. 7. The dyeing method according to any one of claims 1 to 6, wherein the step (2) further comprises the steps of gasifying and depressurizing carbon dioxide and performing dye separation and carbon dioxide recovery through a recovery pipeline; preferably, the step of introducing supercritical carbon dioxide into the dyeing kettle to scour the dyed automobile membrane is further included after the carbon dioxide is gasified and decompressed; preferably, the step of washing the dyed automobile film by introducing supercritical carbon dioxide further comprises the step of wiping the dyed automobile film with ethanol to remove the surface oligomers of the automobile film after flooding.
8. 8. Dyeing method according to any one of claims 1 to 7, characterized in that it comprises the following steps: (1) Washing and drying the automobile film, and then placing the dye and the washed and dried automobile film into a dyeing kettle; (2) Injecting carbon dioxide into a dyeing kettle, heating to 70-130 ℃ and pressurizing to 20-30 MPa for dyeing for 20-130 min, cooling to not higher than 70 ℃ after dyeing, gasifying and decompressing the carbon dioxide, recovering the dye through a recovery pipeline, introducing supercritical carbon dioxide into the dyeing kettle for surface flooding cleaning of the dyed automobile film, taking out after decompression, wiping with ethanol to remove oligomers on the surface of the flooding automobile film, and finishing the dyeing of the automobile film.
9. 9. A dyed automotive film obtained by dyeing an undyed automotive film by the dyeing method according to any one of claims 1 to 7.
10. 10. Use of the dyed automotive film of claim 8 in front and rear windshields, side glazings, sunroofs or bodies of automobiles.

Description

Dyeing method for automobile film and application thereof Technical Field The invention belongs to the technical field of dyeing, and relates to a dyeing method and application of an automobile film. Background The automobile film is used for attaching a layer of film-shaped object on front and rear windshields, side window glass, skylight or the whole body of an automobile, is mainly used for blocking ultraviolet rays, blocking part of heat and preventing injury and anti-dazzle caused by glass splashing, can effectively isolate corrosion of ultraviolet rays, acid rain, bird droppings, sand stone and the like on automobile paint, and can also provide protection and beautification effects to the automobile body to a certain extent. The automobile film can provide abundant color and texture choices, so that an owner can easily create unique appearance and show personal styles, and therefore, the colorless automobile film is necessary to be dyed. At present, common automobile film dyeing methods comprise a traditional organic solvent dyeing method, a thermal transfer dyeing method and the like. The method is characterized in that an organic solvent is used as a dye carrier, and an automobile film is colored in a dipping or spraying mode, a large amount of volatile organic compounds are needed, so that the method is high in environmental pollution and high in harmful gas emission, the weather resistance and optical performance of the automobile film are affected by organic solvent residues, meanwhile, the problems of uneven dye distribution, easiness in color difference, spots and the like are also caused, and the problems of complex process, high energy consumption, single color level and the like are caused by the thermal transfer printing dyeing method, namely the dye is needed to be transferred to the surface of the automobile film through hot pressing. Therefore, aiming at the technical problems, the development of the dyeing method for the automobile film with environmental protection, high efficiency and uniform color avoids using an organic solvent, can effectively improve the dyeing uniformity and the color fastness, and simultaneously reduces the energy consumption and the production cost, which is still necessary. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide the dyeing method of the automobile film and the application thereof, wherein the dyeing method uses supercritical carbon dioxide as a dye carrier, so that the automobile film is effectively dyed, an organic solvent is avoided, the dyeing uniformity and the color fastness of the dyed automobile film are improved, meanwhile, the excellent optical performance of the film material is not influenced, and the dyeing method is suitable for various automobile film materials. In order to achieve the aim of the invention, the invention adopts the following technical scheme: In a first aspect, the present invention provides a method for dyeing an automotive film, the method comprising the steps of: (1) Putting the dye and the automobile film into a dyeing kettle; (2) Carbon dioxide is injected into a dyeing kettle, then the temperature is raised to 70-130 ℃ for dyeing (such as 70 ℃, 75 ℃,80 ℃, 85 ℃, 90 ℃, 95 ℃, 100 ℃, 105 ℃, 110 ℃, 115 ℃, 120 ℃, 125 ℃ or 130 ℃) and the pressure is increased to 20-30 MPa (such as 20 MPa, 21 MPa, 22 MPa, 23 MPa, 24 MPa, 25 MPa, 26 MPa, 27 MPa, 28 MPa, 29 MPa or 30 MPa) for dyeing, and the dyeing of the automobile film is completed after the temperature is lowered. The dyeing method of the automobile film provided by the invention uses supercritical carbon dioxide as a green dyeing medium, has the characteristics of environmental protection, no pollution and no emission of organic solvents, can realize high-efficiency dispersion in the supercritical carbon dioxide to form a stable system, can realize high permeability and uniform dyeing of the dye on the automobile film by optimizing the pressure and temperature parameter range in the dyeing process, can greatly shorten the dyeing time compared with the traditional solution dyeing time, greatly reduce the dyeing energy consumption compared with a thermal transfer dyeing method, can ensure that the finally obtained dyed automobile film has the advantages of uniform dyeing, high color saturation and high color fastness, has excellent optical properties (light transmittance and haze) without being influenced, is suitable for various automobile film materials, and can easily cause incomplete dissolution of the dye if the temperature in the dyeing process is lower than 70 ℃ and influence the final dyeing effect if the temperature is higher than 130 ℃, and can easily cause deformation of the automobile film to influence the appearance if the pressure in the dyeing process is lower than MPa and can easily cause incomplete dissolution of the dye if the pressure is not higher than MPa on the aspect. Preferably, the dye of step