CN116727213A - Polyurethane precoating film and preparation method thereof - Google Patents

Polyurethane precoating film and preparation method thereof Download PDF

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Publication number
CN116727213A
CN116727213A CN202310700072.6A CN202310700072A CN116727213A CN 116727213 A CN116727213 A CN 116727213A CN 202310700072 A CN202310700072 A CN 202310700072A CN 116727213 A CN116727213 A CN 116727213A
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CN
China
Prior art keywords
polyurethane
coating
precoating film
box
substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310700072.6A
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Chinese (zh)
Inventor
金怀龙
汪伟
胡凯
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Nanjing Lanpucheng New Materials Co ltd
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Nanjing Lanpucheng New Materials Co ltd
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Application filed by Nanjing Lanpucheng New Materials Co ltd filed Critical Nanjing Lanpucheng New Materials Co ltd
Priority to CN202310700072.6A priority Critical patent/CN116727213A/en
Publication of CN116727213A publication Critical patent/CN116727213A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/0278—Arrangement or mounting of spray heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/20—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
    • B05B9/0423—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material for supplying liquid or other fluent material to several spraying apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/007—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0209—Multistage baking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2503/00—Polyurethanes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/25—Greenhouse technology, e.g. cooling systems therefor

Abstract

The invention relates to the technical field of films, in particular to a polyurethane precoating film and a preparation method of the precoating film, wherein the preparation method of the polyurethane precoating film comprises the following steps: corona treating either side of the substrate; coating a single-component polyurethane anti-fog coating on the corona treated surface of the substrate by adopting a coating device, and curing to prepare a polyurethane coating attached to the substrate; after freezing treatment is carried out on the polyurethane coating, gradual heating treatment is carried out, and the polyurethane antifogging film is prepared; according to the invention, the prepared polyurethane coating is immediately subjected to freezing treatment, so that solidified polymer chains shrink, wind and fix, and then the polymer chains in the polyurethane coating are relatively fixed and tightly wound after gradual heating treatment, so that the polymer chains move less, and the prepared polyurethane film has better anti-fog durability.

Description

Polyurethane precoating film and preparation method thereof
Technical Field
The invention relates to the technical field of films, in particular to a polyurethane precoating film and a preparation method of the precoating film.
Background
In life, the plastic film is condensed on the surface of the base material due to internal and external temperature changes, mist is formed by precipitation in a form of tiny dew, and the tiny dew diffuses to the light, so that the light transmittance of the transparent material is remarkably reduced, a lot of trouble is brought to the trip and life of people, and even potential safety hazards and great economic loss are caused, so that the problem of mist formation of the water vapor on the plastic film needs to be solved.
In the prior art, usually, an anti-fog coating is coated on the surface of a plastic film or a glass substrate to form an anti-fog layer, so that the plastic film or the glass substrate has an anti-fog effect, at present, in the process of forming a polyurethane anti-fog coating by using a single-component polyurethane anti-fog coating, the curing temperature is generally lower than the curing temperature of polyurethane, so that the single-component polyurethane coating can be cured to form a film and has proper curing degree, a surfactant can migrate to the surface of the coating to obtain a better anti-fog effect, but generally, the anti-fog effect of the polyurethane anti-fog coating can be lost after the polyurethane anti-fog coating is placed for 24-7 days at room temperature, because the curing degree of the polyurethane anti-fog coating which is not cured in the formed polyurethane anti-fog coating can be continuously cured at room temperature, and finally, the surfactant cannot be enriched or oozed in a trace amount on the surface of the coating, so that the anti-fog effect of the polyurethane anti-fog coating can be lost.
Disclosure of Invention
The invention aims to provide a polyurethane precoating film and a preparation method of the precoating film, so that the prepared polyurethane antifogging film has better antifogging durability and better mechanical property.
In order to achieve the above object, in a first aspect, the present invention provides a method for preparing a polyurethane precoating film, comprising:
corona treating either side of the substrate;
coating a single-component polyurethane anti-fog coating on the corona treated surface of the substrate by adopting a coating device, and curing to prepare a polyurethane coating attached to the substrate;
and (3) after the polyurethane coating is subjected to freezing treatment, carrying out gradual heating treatment, and obtaining the polyurethane antifogging film.
Wherein, the single-component polyurethane antifogging coating comprises the following components in parts by weight: 70-100 parts of single-component waterborne polyurethane coating, 10-35 parts of surfactant and 5-15 parts of other auxiliary agents.
Wherein the single-component aqueous polyurethane adopts any one or a combination of a plurality of cationic single-component aqueous polyurethane, nonionic single-component aqueous polyurethane or anionic single-component aqueous polyurethane, and the solid content of the single-component aqueous polyurethane is 25% -35%.
Wherein the surfactant adopts any one or a combination of a plurality of polyether modified polydimethylsiloxane, perfluoroalkyl polyoxyethylene ether, long-chain fatty alcohol polyoxyethylene ether, polyester modified polydimethylsiloxane, alkyl sulfonate or fatty acid sulfoalkyl ester.
The specific steps of obtaining the polyurethane antifogging film comprise the following steps of:
freezing the polyurethane coating for 1-7 days at a temperature of less than or equal to 15 ℃;
and (3) carrying out three-stage heating treatment on the polyurethane coating after the freezing treatment, wherein the temperature after the first-stage heating treatment is-17 to-12 ℃, and the temperature after the second-stage heating treatment is-10 to-6 ℃.
The coating device comprises a processing box, two driving wheels, two motors, a coating box, a liquid pump, a connecting pipe and two spray heads;
the two driving wheels are respectively connected with the processing table in a rotating way and are respectively positioned in the processing box; the two motors are respectively and fixedly connected with the processing box, and the output ends of the two motors are respectively and fixedly connected with the two driving wheels and are respectively positioned at the side edges of the processing box; the coating box is fixedly connected with the processing box and is positioned at the top of the processing box; the liquid pump is fixedly connected and communicated with the paint box and is positioned at the bottom of the paint box; the connecting pipe is communicated with the liquid pump and is positioned at the top of the liquid pump; the spray head is communicated with the connecting pipe and is positioned at the bottom of the connecting pipe.
In a second aspect, the invention also provides a polyurethane precoating film, which is prepared by adopting the preparation method of the polyurethane precoating film.
According to the preparation method of the polyurethane precoating film and the preparation method of the precoating film, the prepared polyurethane coating is immediately subjected to freezing treatment, so that solidified polymer chains shrink, wind and fix, and then after gradual heating treatment, the polymer chains in the polyurethane coating are relatively fixed and wind tightly, the movement of the polymer chains is small, the problems that the surface active agent cannot be enriched or oozed in a trace amount on the surface of the polyurethane coating due to the movement of the polymer chains are avoided, and the components and physical properties of the polyurethane coating are not influenced, so that the prepared polyurethane film has good anti-fog durability.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for preparing a polyurethane precoating film of the present invention.
FIG. 2 is a flow chart of the process of the invention for preparing the polyurethane antifogging film by carrying out gradual heating treatment after freezing treatment on the polyurethane coating.
Fig. 3 is a schematic structural view of the coating apparatus of the present invention.
Fig. 4 is a cross-sectional view of the coating apparatus of the present invention.
1-processing box, 2-driving wheel, 3-motor, 4-coating box, 5-liquid pump, 6-connecting pipe, 7-shower nozzle, 8-cleaning mechanism, 81-mount pad, 82-cylinder, 83-cleaning member.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring to fig. 1 to 4, in a first aspect, the present invention provides a method for preparing a polyurethane precoating film, comprising:
s1, carrying out corona treatment on any side of a substrate;
s2, coating a single-component polyurethane anti-fog coating on the corona treated surface of the substrate by adopting a coating device, and curing to prepare a polyurethane coating attached to the substrate;
the single-component polyurethane anti-fog coating comprises the following components in parts by weight: 70-100 parts of single-component waterborne polyurethane coating, 10-35 parts of surfactant and 5-15 parts of other auxiliary agents. The single-component aqueous polyurethane adopts any one or a combination of a plurality of cationic single-component aqueous polyurethane, nonionic single-component aqueous polyurethane or anionic single-component aqueous polyurethane, and the solid content of the single-component aqueous polyurethane is 25% -35%. The surfactant adopts any one or a combination of a plurality of polyether modified polydimethylsiloxane, perfluoroalkyl polyoxyethylene ether, long-chain fatty alcohol polyoxyethylene ether, polyester modified polydimethylsiloxane, alkyl sulfonate or fatty acid sulfoalkyl ester. The curing temperature is 30-70 ℃, and the curing time is 1-24 h.
S3, after the polyurethane coating is subjected to freezing treatment, carrying out gradual heating treatment to obtain a polyurethane anti-fog film;
the method comprises the following specific steps:
s31, freezing the polyurethane coating for 1-7 days at a temperature of less than or equal to 15 ℃;
s32, carrying out three-stage heating treatment on the polyurethane coating after the freezing treatment, wherein the temperature after the first-stage heating treatment is-17 to-12 ℃, and the temperature after the second-stage heating treatment is-10 to-6 ℃;
the heating rate of each heating treatment in the three-stage heating treatment is independently selected from 4-6 ℃/h, and the heating time of each heating treatment is independently selected from 1-6 h.
According to the preparation method of the polyurethane precoating film, the prepared polyurethane coating is immediately subjected to freezing treatment, so that solidified polymer chains shrink, wind and fix, and then the temperature is gradually raised, so that the polymer chains in the polyurethane coating are relatively fixed and tightly wound, the movement of the polymer chains is small, the problem that the surfactant cannot be enriched or oozed out slightly on the surface of the coating due to the movement of the polymer chains is avoided, and the components and physical properties of the polyurethane coating are not influenced, so that the prepared polyurethane film has good antifogging durability.
Further, the coating device comprises a processing box 1, two driving wheels 2, two motors 3, a coating box 4, a liquid pump 5, a connecting pipe 6 and two spray heads 7;
the two driving wheels 2 are respectively connected with the processing table in a rotating way and are respectively positioned in the processing box 1; the two motors 3 are respectively and fixedly connected with the processing box 1, and the output ends of the two motors 3 are respectively and fixedly connected with the two driving wheels 2 and are respectively positioned at the side edges of the processing box 1; the paint box 4 is fixedly connected with the processing box 1 and is positioned at the top of the processing box 1; the liquid pump 5 is fixedly connected and communicated with the paint box 4 and is positioned at the bottom of the paint box 4; the connecting pipe 6 is communicated with the liquid pump 5 and is positioned at the top of the liquid pump 5; the spray head 7 is communicated with the connecting pipe 6 and is positioned at the bottom of the connecting pipe 6.
In this embodiment, the corona-treated substrate is placed on the two driving wheels 2, and the corona-treated side faces upwards, the motor 3 drives the driving wheels 2 to rotate, the driving wheels 2 drive the substrate to move, meanwhile, the liquid pump 5 extracts the single-component polyurethane anti-fog paint in the paint box 4, and the single-component polyurethane anti-fog paint is sprayed out through the spray head 7, so that the single-component polyurethane anti-fog paint is coated on the surface of the substrate, and the coated substrate is cured to obtain a polyurethane coating attached to the substrate.
Further, the coating device further comprises two cleaning mechanisms 8, and the two cleaning mechanisms 8 are respectively arranged inside the processing box 1.
In the present embodiment, the substrate surface can be cleaned by the two cleaning mechanisms 8.
Further, the cleaning mechanism 8 includes a mounting base 81, an air cylinder 82, and a cleaning member 83; the mounting seat 81 is fixedly connected with the processing box 1 and is positioned in the processing box 1; the air cylinder 82 is fixedly connected with the mounting seat 81 and is positioned at the side edge of the mounting seat 81; the cleaning member 83 is fixedly connected with the output rod of the cylinder 82 and is positioned at the side edge of the cylinder 82.
In this embodiment, the base material after corona treatment is placed on the two driving wheels 2, and the side after corona treatment faces upwards, the motor 3 drives the driving wheels 2 to rotate, the driving wheels 2 drive the base material to move, the mounting seat 81 is used for supporting the air cylinder 82, and the air cylinder 82 can drive the cleaning member 83 to approach the base material, so that the base material is cleaned before being coated, and the quality of the prepared polyurethane precoat film is improved.
In a second aspect, the invention also provides a polyurethane precoating film, which is prepared by adopting the preparation method of the polyurethane precoating film.
According to the polyurethane precoating film, when the polyurethane coating is prepared, the prepared polyurethane coating is immediately subjected to freezing treatment, so that solidified polymer chains shrink, wind and fix, and then after gradual heating treatment, the polymer chains in the polyurethane coating are relatively fixed and tightly wound, and the movement of the polymer chains is small, so that the problems that the surfactant cannot be enriched or oozed out slightly on the surface of the coating due to the movement of the polymer chains and the air holes, defects and the like on the inner part and the surface of the polyurethane coating are prevented, the components and the physical properties of the polyurethane coating are not influenced, and the prepared polyurethane film has good anti-fog durability.
The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.

Claims (7)

1. A method for preparing a polyurethane precoating film, comprising:
corona treating either side of the substrate;
coating a single-component polyurethane anti-fog coating on the corona treated surface of the substrate by adopting a coating device, and curing to prepare a polyurethane coating attached to the substrate;
and (3) after the polyurethane coating is subjected to freezing treatment, carrying out gradual heating treatment, and obtaining the polyurethane antifogging film.
2. A process for producing a polyurethane precoating film according to claim 1, characterized in that,
the single-component polyurethane anti-fog coating comprises the following components in parts by weight: 70-100 parts of single-component waterborne polyurethane coating, 10-35 parts of surfactant and 5-15 parts of other auxiliary agents.
3. A process for producing a polyurethane precoating film according to claim 2, characterized in that,
the single-component aqueous polyurethane adopts any one or a combination of a plurality of cationic single-component aqueous polyurethane, nonionic single-component aqueous polyurethane or anionic single-component aqueous polyurethane, and the solid content of the single-component aqueous polyurethane is 25% -35%.
4. A process for producing a polyurethane precoating film according to claim 3, wherein,
the surfactant adopts any one or a combination of a plurality of polyether modified polydimethylsiloxane, perfluoroalkyl polyoxyethylene ether, long-chain fatty alcohol polyoxyethylene ether, polyester modified polydimethylsiloxane, alkyl sulfonate or fatty acid sulfoalkyl ester.
5. A process for producing a polyurethane precoating film according to claim 4, wherein,
after the polyurethane coating is subjected to freezing treatment, the gradual heating treatment is carried out, and the specific steps of obtaining the polyurethane antifogging film comprise:
freezing the polyurethane coating for 1-7 days at a temperature of less than or equal to 15 ℃;
and (3) carrying out three-stage heating treatment on the polyurethane coating after the freezing treatment, wherein the temperature after the first-stage heating treatment is-17 to-12 ℃, and the temperature after the second-stage heating treatment is-10 to-6 ℃.
6. A process for producing a polyurethane precoating film according to claim 5, wherein,
the coating device comprises a processing box, two driving wheels, two motors, a coating box, a liquid pump, a connecting pipe and two spray heads;
the two driving wheels are respectively connected with the processing table in a rotating way and are respectively positioned in the processing box; the two motors are respectively and fixedly connected with the processing box, and the output ends of the two motors are respectively and fixedly connected with the two driving wheels and are respectively positioned at the side edges of the processing box; the coating box is fixedly connected with the processing box and is positioned at the top of the processing box; the liquid pump is fixedly connected and communicated with the paint box and is positioned at the bottom of the paint box; the connecting pipe is communicated with the liquid pump and is positioned at the top of the liquid pump; the spray head is communicated with the connecting pipe and is positioned at the bottom of the connecting pipe.
7. A polyurethane precoating film characterized by being produced by the method for producing a polyurethane precoating film according to any one of claims 1 to 6.
CN202310700072.6A 2023-06-14 2023-06-14 Polyurethane precoating film and preparation method thereof Pending CN116727213A (en)

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CN202310700072.6A CN116727213A (en) 2023-06-14 2023-06-14 Polyurethane precoating film and preparation method thereof

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CN114230841A (en) * 2021-12-30 2022-03-25 深圳南科新材科技有限公司 Polyurethane antifogging film and preparation method thereof
CN114381190A (en) * 2021-12-30 2022-04-22 深圳南科新材科技有限公司 Polyurethane antifogging film and preparation method thereof
CN216539136U (en) * 2021-12-27 2022-05-17 昆明天博科技有限公司 A three proofings lacquer spraying device for integrated circuit board production

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030203991A1 (en) * 2002-04-30 2003-10-30 Hydromer, Inc. Coating composition for multiple hydrophilic applications
CN103391875A (en) * 2011-05-31 2013-11-13 Sdc科技有限公司 Anti-fog polyurethane coating compositions
WO2017159564A1 (en) * 2016-03-14 2017-09-21 旭化成株式会社 Highly durable antifogging coating film and coating composition
CN209292852U (en) * 2018-11-12 2019-08-23 中国江西国际经济技术合作有限公司 A kind of portable road sign machine for brushing based on municipal road construction
CN216539136U (en) * 2021-12-27 2022-05-17 昆明天博科技有限公司 A three proofings lacquer spraying device for integrated circuit board production
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