CN217838787U - Automobile paint surface protective film - Google Patents
Automobile paint surface protective film Download PDFInfo
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- CN217838787U CN217838787U CN202222397442.7U CN202222397442U CN217838787U CN 217838787 U CN217838787 U CN 217838787U CN 202222397442 U CN202222397442 U CN 202222397442U CN 217838787 U CN217838787 U CN 217838787U
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Abstract
The utility model discloses a protection film that car was used, especially a car finish protection film, including compound restoration coating, thermoplastic polyurethane substrate layer, pressure sensitive adhesive layer in proper order and from the type rete, its characterized in that: the single-side surface of the pressure-sensitive adhesive layer on the thermoplastic polyurethane substrate layer is pointed to form linear convex parts which are distributed in a criss-cross grid shape, and the ratio of the thickness of the pressure-sensitive adhesive layer to the convex height of the convex parts is 2-3.5: 1. The utility model provides a "adopt the means of membrane structure improvement to avoid the adhesive to remain in the at utmost" technical problem when the car finish protection film is peeled off from the automobile body finish ". The utility model relates to an automobile paint surface protection film, it can paste to the automobile body more easily to and peel off from the automobile body is complete again.
Description
Technical Field
The utility model relates to a protection film that car was used, especially a car finish protection film.
Background
The automobile paint surface protective film is also called as invisible automobile clothes, is a layer of transparent protective film attached to the surface of an automobile body, can effectively prevent scratching and hitting of sand grains, also isolates the contact of automobile paint and air, and can prevent acid rain, insects, bird droppings and the like from corroding the automobile body paint surface. The main purpose is that the original factory paint of the automobile can be bright as new after being torn off.
The existing automobile paint surface protective film is generally of a three-layer structure and sequentially comprises a repair coating, a thermoplastic polyurethane base material layer and a pressure-sensitive adhesive layer. The repair coating is positioned on the outermost layer of the product and plays a role in protecting scratches, dirt blocking, ultraviolet protection and the like.
In order to ensure the adhesion strength of the automobile paint surface protective film on an automobile body, the pressure-sensitive adhesive usually adopted in the existing automobile paint surface protective film product has larger adhesive force, so that the situation that adhesive residues are remained on the automobile body paint surface is often generated in the stripping process after the automobile paint surface protective film is adhered on the automobile body. In addition, the use of diluents or solvents to strip off pressure sensitive adhesive residues left on the vehicle body can cause various degrees of damage to the vehicle body finish.
In this regard, the applicant proposes the product of the present invention.
Disclosure of Invention
The utility model aims at providing an automobile paint surface protection film who possesses high adhesion strength between substrate and the pressure-sensitive adhesive in order to solve above-mentioned prior art not enough.
In order to realize above-mentioned purpose, the utility model discloses a car finish protection film, including compound restoration coating, thermoplastic polyurethane substrate layer, pressure sensitive adhesive layer in proper order and from the type rete, the unilateral surface of directional pressure sensitive adhesive layer on the thermoplastic polyurethane substrate layer forms the bellying of line type, and is vertically and horizontally staggered's latticed distribution, the ratio of the thickness of pressure sensitive adhesive layer and the bellying height of bellying is 2 ~ 3.5: 1.
The automobile paint surface protective film has the advantages that due to the linear convex parts on the surface of the base material, the pressure-sensitive adhesive liquid is coated and cured on the surface, the bonding strength of the pressure-sensitive adhesive liquid and the base material can be further greatly improved, and when the automobile paint surface protective film is peeled from the automobile paint surface in use, the integrity of the base material and the pressure-sensitive adhesive liquid is better, so that the condition that adhesive residues are remained on the automobile paint surface is not easy to occur.
Preferably, the height of the projection part is 3-15 μm, and the width of the projection is 10-50 μm; the pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive layer or a polyurethane pressure-sensitive adhesive layer, the thickness of the pressure-sensitive adhesive layer is 6-50 mu m, and the visible light transmittance can be controlled to be more than 90%.
In the above preferred embodiment, the height of the protrusions is limited to below 15 μm, and the width of the protrusions is limited to below 50 μm, so that the protrusions with the size can not be directly observed by naked eyes after being covered by the pressure-sensitive adhesive, that is, the appearance of the whole protective film is not affected, and further, the negative effect that the protrusions may cause the use of the protective film is avoided, for example, the appearance is not accepted by the market.
Preferably, the repair coating is a polyurethane coating, the thickness of the repair coating is 5-25 μm, the repair coating can be self-repaired under the heating condition after micro scratches are generated, and an ultraviolet absorbent and nano ceramic powder can be added into the polyurethane coating to play the functions of blocking ultraviolet rays, preventing vehicle paint from aging and improving the hardness of the coating.
The ultraviolet absorbent is preferably anatase type nanometer TiO with good stability 2 Powder and rutile type nano TiO 2 At least one of the powders. More preferably anatase type nano TiO 2 Powder and rutile type nano TiO 2 Mixture of powders, nano TiO in anatase form 2 Powder and rutile type nano TiO 2 The powder has strong absorption and scattering effects on ultraviolet rays, has low ultraviolet transmittance, and is stable along with the time. Thus adding anatase type nano TiO 2 Powder and rutile type nano TiO 2 The powder can effectively improve the UV aging resistance of the coating.
Preferably, the Thermoplastic Polyurethane (TPU) substrate layer is an aliphatic thermoplastic polyurethane substrate layer, and the thickness of the TPU substrate layer is 100-300 mu m. The surface hardness of the material is 80A-93A, the visible light transmittance can reach more than 90%, the elongation at break can reach more than 300%, and the haze can be controlled to be less than 2%.
Preferably, the release film layer is a PET release film layer with the thickness of 23-100 μm. More preferably a white PET release film, the haze is more than 70%, and the release force is controlled within 20 g/inch.
The utility model provides a pair of car finish protection film, prior art compares, it possesses following advantage:
1. the utility model relates to an automobile paint surface protection film, it can paste to the automobile body more easily to and peel off from the automobile body is complete again, the condition that "adhesive residue remains on the automobile body lacquer painting" can avoid taking place to the at utmost in whole process.
2. The utility model relates to an automobile paint surface protection film, it still has better chemical stability and thermal stability, has consequently prolonged the life of protection film.
Drawings
FIG. 1 is a schematic view of a layered structure of a protective film for automotive finish;
fig. 2 is a schematic view of the surface structure of the thermoplastic polyurethane substrate layer.
In the figure: the adhesive comprises a repair coating layer 1, a thermoplastic polyurethane base material layer 2, a protruding portion 2-1, a pressure-sensitive adhesive layer 3 and a release film layer 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art all belong to the protection scope of the present invention.
Example 1:
as shown in fig. 1, as an embodiment of the utility model, the utility model discloses an embodiment, the car finish protection film that provides in this embodiment, including compound restoration coating 1, thermoplastic polyurethane substrate layer 2, pressure sensitive adhesive layer 3 in proper order and from type rete 4, the bellying 2-1 of directional pressure sensitive adhesive layer 3's unilateral surface formation line type on the thermoplastic polyurethane substrate layer 2, and be vertically and horizontally staggered's latticed distribution.
In this embodiment, the repair coating 1 is made of polyurethane, has a thickness of 10 μm, and contains an ultraviolet absorber and nano ceramic powder, wherein the ultraviolet absorber is anatase type nano TiO 2 Powder and rutile type nano TiO 2 A mixture of powders, 2 parts by weight of ultraviolet absorber and nano-ceramic powder with respect to 100 parts by weight of polyurethane, and anatase type nano-TiO 2 Powder, rutile type nano TiO 2 The mol ratio of the powder to the nano ceramic powder is 2: 1.
In this embodiment, the Thermoplastic Polyurethane (TPU) substrate layer is made of aliphatic thermoplastic polyurethane and has a thickness of 200 μm. The height of the projection 2-1 on the surface is 10 μm, and the width of the projection is 25 μm;
in this embodiment, the pressure-sensitive adhesive layer 3 is made of an acrylic pressure-sensitive adhesive, and has a thickness of 25 μm and a visible light transmittance of 90% or more.
In this embodiment, the release film layer 4 is made of white polyethylene terephthalate (PET) and has a thickness of 55 μm.
The preparation method of the protective film for the automobile paint surface in the embodiment comprises the following steps:
a. preparation of coating solution for repair coat 1
100 parts of polycaprolactone polyol resin, 2 parts of ultraviolet absorbent and nano ceramic powder mixture (anatase type nano TiO) 2 Powder, rutile type nano TiO 2 The molar ratio of the powder to the nano ceramic powder is 2: 1) is added into 150 parts of ethyl acetate, and finally 20 parts of isocyanate curing agent toluene diisocyanate is added, fully stirred for 30min and uniformly mixed for later use.
b. Preparation of thermoplastic polyurethane substrates
Preparing materials: comprises the following components in parts by weight: 80 parts of isophorone diisocyanate (IPDI), 20 parts of polytetrahydrofuran ether glycol, 10 parts of polycaprolactone glycol and 5 parts of chain extender. Wherein the chain extender is hexafluorobisphenol A.
The preparation method comprises the following steps:
s1, dehydrating polytetrahydrofuran ether glycol for 1.5 to 2 hours in vacuum at the temperature of between 110 and 120 ℃ and under the pressure of 0.1 MPa;
s2, adding a proper amount of dehydrated polytetrahydrofuran ether glycol, isophorone diisocyanate (IPDI) and polycaprolactone glycol into a four-neck flask provided with a mechanical stirring and condensing reflux device and a thermometer, heating to 70 ℃, vacuumizing, filling nitrogen for protection, continuously reacting for 1.5-2 hours, adding a solvent Dimethylformamide (DMF) to adjust the solid content to 60wt%, so as to reduce the system viscosity and promote the reaction to be fully carried out;
s3, after the quantity fraction of the isocyanate matrix in the prepolymer to be measured is stable, gradually heating to 100 ℃, adding a chain extender, violently stirring for reaction for 2 hours, vacuum degassing, pouring a viscous product into a mold paved with a polytetrafluoroethylene film with a smooth surface while the viscous product is hot, wherein the mold is a 40-40cm glass plate and is engraved with a groove with the depth of 200 microns, linear groove parts are required to be formed on the surface of the polytetrafluoroethylene film in advance and are distributed in a criss-cross grid shape, the groove depth of the groove parts is 10 microns, the groove width is 25 microns, after uniform rolling by a rolling rod, the polytetrafluoroethylene film is placed in a 70 ℃ drying oven for drying for 5 days to form a film, and then the thermoplastic polyurethane film is placed at normal temperature for 24 hours to obtain the thermoplastic polyurethane film, thus completing the preparation.
c. Coating of pressure-sensitive adhesive layer 3
The pressure-sensitive adhesive coating liquid is coated on one side surface (the surface where the convex part 2-1 is positioned) of the TPU base material with the thickness of 200 mu m, and the pressure-sensitive adhesive layer 3 with the thickness of 25 mu m of dry adhesive is formed under the drying condition of 110 ℃ for 2 min. Then, a 55 μm white PET release film was laminated on the above pressure-sensitive adhesive layer 3.
d. Application of repair coat 1
And c, coating a repair coating 1 on the other side surface of the TPU substrate in the step c, curing at 120 ℃ for 2min, and drying to obtain a semi-finished product of the protective film, wherein the thickness of the dried product is 10 microns.
e. Aging
And d, putting the semi-finished product in the step d into a curing chamber at 50 ℃, and carrying out 72 hours to obtain the protective film.
Example 2:
as a second embodiment of the present invention, the layered structure of the protective film for automobile paint in this embodiment is the same as that of embodiment 1.
However, in this embodiment, the material of the repair coating 1 is polyurethane, but the thickness is 5 μm, and the repair coating also contains an ultraviolet absorber and nano ceramic powder, wherein the ultraviolet absorber is anatase type nano TiO 2 Powder and rutile type nano TiO 2 A mixture of powders, 2 parts by weight of ultraviolet absorber and nano-ceramic powder, relative to 100 parts by weight of polyurethane, and anatase nano-TiO 2 Powder, rutile type nano TiO 2 The mol ratio of the powder to the nano ceramic powder is 2: 1.
In this embodiment, the Thermoplastic Polyurethane (TPU) substrate layer is made of aliphatic thermoplastic polyurethane and has a thickness of 100 μm. The height of the projection 2-1 on the surface is 3 μm, and the width of the projection is 10 μm;
in this embodiment, the pressure-sensitive adhesive layer 3 is made of an acrylic pressure-sensitive adhesive, but has a thickness of 6 μm and a visible light transmittance of 90% or more.
In this embodiment, the release film layer 4 is made of white polyethylene terephthalate (PET), and the thickness thereof is 23 μm.
The basic steps of a method for preparing a protective film for an automotive finish in this example are the same as those in example 1.
However, in the method for manufacturing the protective film for the automobile paint surface, in the step b, the mold is a 40 × 40cm glass plate, which is engraved with grooves having a depth of 100 μm, and it is also required that linear grooves are formed in advance on the surface of the teflon film and are distributed in a criss-cross grid pattern, the groove depth of the grooves is 3 μm, and the groove width is 10 μm.
Example 3:
as a third embodiment of the present invention, the layered structure of the protective film for automobile paint in this embodiment is the same as that of embodiment 1.
However, in this embodiment, the material of the repair coating 1 is polyurethane, the thickness is 25 μm, and the repair coating also contains an ultraviolet absorber and nano ceramic powder, wherein the ultraviolet absorber is anatase type nano TiO 2 Powder and rutile type nano TiO 2 A mixture of powders, 2 parts by weight of ultraviolet absorber and nano-ceramic powder with respect to 100 parts by weight of polyurethane, and anatase type nano-TiO 2 Powder, rutile type nano TiO 2 The mol ratio of the powder to the nano ceramic powder is 2: 1.
In this embodiment, the Thermoplastic Polyurethane (TPU) substrate layer is made of aliphatic thermoplastic polyurethane and has a thickness of 300 μm. The height of the projection 2-1 on the surface is 15 μm, and the width of the projection is 50 μm;
in this embodiment, the pressure-sensitive adhesive layer 3 is made of acrylic pressure-sensitive adhesive, but has a thickness of 50 μm and a visible light transmittance of 90% or more.
In this embodiment, the release film layer 4 is made of white polyethylene terephthalate (PET), and has a thickness of 100 μm.
The basic steps of a method for preparing a protective film for an automotive finish in this example are the same as those in example 1.
However, in the method for manufacturing the protective film for the automobile paint surface, in the step b, the mold is a 40 × 40cm glass plate, which is engraved with grooves having a depth of 300 μm, and it is also required that linear grooves are formed in advance on the surface of the teflon film and are distributed in a criss-cross grid pattern, the groove depth of the grooves is 15 μm, and the groove width is 50 μm.
Comparative example 1:
an automobile paint surface protective film comprises a repair coating 1, a thermoplastic polyurethane substrate layer 2, a pressure-sensitive adhesive layer 3 and a release film layer 4 which are sequentially compounded.
In this comparative example, the repair coating 1 is made of polyurethane, has a thickness of 10 μm, and contains an ultraviolet absorber and nano ceramic powder, wherein the ultraviolet absorber is anatase type nano TiO 2 Powder andrutile type nano TiO 2 A mixture of powders, 2 parts by weight of ultraviolet absorber and nano-ceramic powder, relative to 100 parts by weight of polyurethane, and anatase nano-TiO 2 Powder, rutile type nano TiO 2 The mol ratio of the powder to the nano ceramic powder is 2: 1.
In this comparative example, the Thermoplastic Polyurethane (TPU) substrate layer was made of aliphatic thermoplastic polyurethane and had a thickness of 200. Mu.m.
In this comparative example, the pressure-sensitive adhesive layer 3 is made of acrylic pressure-sensitive adhesive, has a thickness of 25 μm, and has a visible light transmittance of 90% or more.
In this comparative example, the release film layer 4 was made of white polyethylene terephthalate (PET) and had a thickness of 55 μm.
In this comparative example, a method for preparing an automobile paint protective film includes:
a. preparation of coating solution for repair coat 1
100 parts of polycaprolactone polyol resin, 2 parts of ultraviolet absorbent and nano ceramic powder mixture (anatase type nano TiO) 2 Powder, rutile type nano TiO 2 The molar ratio of the powder to the nano ceramic powder is 2: 1) is added into 150 parts of ethyl acetate, and finally 20 parts of isocyanate curing agent toluene diisocyanate is added, fully stirred for 30min and uniformly mixed for later use.
b. Preparation of thermoplastic polyurethane substrates
Preparing materials: comprises the following components in parts by weight: 80 parts of isophorone diisocyanate (IPDI), 20 parts of polytetrahydrofuran ether glycol, 10 parts of polycaprolactone glycol and 5 parts of chain extender. Wherein the chain extender is hexafluorobisphenol A.
The preparation method comprises the following steps:
s1, dehydrating polytetrahydrofuran ether glycol for 1.5 to 2 hours in vacuum at the temperature of between 110 and 120 ℃ and under the pressure of 0.1 MPa;
s2, adding a proper amount of dehydrated polytetrahydrofuran ether glycol, isophorone diisocyanate (IPDI) and polycaprolactone glycol into a four-neck flask provided with a mechanical stirring and condensing reflux device and a thermometer, heating to 70 ℃, vacuumizing, filling nitrogen for protection, continuously reacting for 1.5-2 h, adding a solvent Dimethylformamide (DMF) to adjust the solid content to 60wt%, so as to reduce the system viscosity and promote the reaction to be fully carried out;
s3, after the quantity fraction of the isocyanate matrix in the prepolymer to be measured is stable, gradually heating to 100 ℃, adding a chain extender, violently stirring for reaction for 2 hours, vacuum degassing, pouring a viscous product into a mold paved with a polytetrafluoroethylene film with a smooth surface while the viscous product is hot, wherein the mold is a 40 x 40cm glass plate and is provided with a groove with the depth of 200 mu m, uniformly rolling the mold by using a rolling rod, placing the mold in a 70 ℃ drying oven for 5 days to form a film, and placing the film at normal temperature for 24 hours to obtain the thermoplastic polyurethane film, thus completing the preparation.
c. Coating of pressure-sensitive adhesive layer 3
And coating the pressure-sensitive adhesive coating liquid on one side surface of the TPU substrate with the thickness of 200 mu m, and drying at the temperature of 110 ℃ for 2min to form the pressure-sensitive adhesive layer 3 with the thickness of 25 mu m of dry adhesive. Then, a 55 μm white PET release film was laminated on the above pressure-sensitive adhesive layer 3.
d. Application of repair coat 1
And c, coating a repair coating 1 on the other side surface of the TPU substrate in the step c, curing at 120 ℃ for 2min, and drying to obtain a semi-finished product of the protective film, wherein the thickness of the dried product is 10 microns.
e. Aging
And d, putting the semi-finished product in the step d into a curing chamber at 50 ℃, and carrying out 72 hours to obtain the protective film.
Comparative example 2:
the protective film for automobile finish of this comparative example had a layered structure similar to that of comparative example 1.
However, in this comparative example, the repair coat 1 was made of polyurethane and had a thickness of 5 μm, and also contained an ultraviolet absorber selected from anatase-type nano TiO and nano ceramic powder 2 Powder and rutile type nano TiO 2 A mixture of powders, 2 parts by weight of ultraviolet absorber and nano-ceramic powder, relative to 100 parts by weight of polyurethane, and anatase nano-TiO 2 Powder, rutile type nano TiO 2 Powder and nanoceramicsThe molar ratio of the powders was 2: 1.
In this comparative example, the Thermoplastic Polyurethane (TPU) substrate layer was made of aliphatic thermoplastic polyurethane and had a thickness of 100. Mu.m.
In this comparative example, the pressure-sensitive adhesive layer 3 is made of acrylic pressure-sensitive adhesive, but has a thickness of 6 μm and a visible light transmittance of 90% or more.
In this comparative example, the release film layer 4 was made of white polyethylene terephthalate (PET) and had a thickness of 23 μm.
The basic steps of the preparation method of the protective film for the automobile paint surface in the comparative example are the same as those of comparative example 1.
Adhesive residue test:
the protective films of examples 1 to 3 and comparative examples 1 to 2 were applied to the painted surface samples of the automobile body, rolled back and forth 3 times with a 2 kg standard press roll, then aged at 70 ℃ under the pressure of a 2 kg standard weight for 20 hours, then cooled at room temperature (23 ± 2 ℃ C., relative humidity 50%) for 0.52 hour, and then peeled 180 hours at 300 mm/min, with no less than 3 specimens per group, with the test results shown in Table 1 below;
| sample(s) | With or without the occurrence of residual gum |
| Example 1 | Is free of |
| Example 2 | Is free of |
| Example 3 | Is free of |
| Comparative example 1 | Is provided with |
| Comparative example 2 | Is provided with |
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.
Claims (5)
1. The utility model provides an automobile paint surface protection film, includes that compound restoration coating, thermoplastic polyurethane substrate layer, pressure sensitive adhesive layer in proper order and leave type rete, its characterized in that: linear convex parts are formed on the thermoplastic polyurethane substrate layer and point to the single-side surface of the pressure-sensitive adhesive layer, the linear convex parts are distributed in a criss-cross grid shape, and the ratio of the thickness of the pressure-sensitive adhesive layer to the convex height of the convex parts is 2-3.5: 1.
2. The protective film for automobile paint surfaces according to claim 1, characterized in that: the height of the bulge part is 3-15 mu m, and the width of the bulge is 10-50 mu m; the pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive layer or a polyurethane pressure-sensitive adhesive layer, and the thickness of the pressure-sensitive adhesive layer is 6-50 mu m.
3. The protective film for automobile paint surfaces according to claim 1, characterized in that: the repair coating is a polyurethane coating, and the thickness of the repair coating is 5-25 mu m.
4. The protective film for automobile paint surfaces according to claim 1, characterized in that: the thermoplastic polyurethane substrate layer is an aliphatic thermoplastic polyurethane substrate layer, and the thickness of the thermoplastic polyurethane substrate layer is 100-300 mu m.
5. The protective film for automobile paint surfaces according to claim 1, characterized in that: the release film layer is a PET release film layer, and the thickness of the release film layer is 23-100 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222397442.7U CN217838787U (en) | 2022-09-09 | 2022-09-09 | Automobile paint surface protective film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222397442.7U CN217838787U (en) | 2022-09-09 | 2022-09-09 | Automobile paint surface protective film |
Publications (1)
| Publication Number | Publication Date |
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| CN217838787U true CN217838787U (en) | 2022-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222397442.7U Active CN217838787U (en) | 2022-09-09 | 2022-09-09 | Automobile paint surface protective film |
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- 2022-09-09 CN CN202222397442.7U patent/CN217838787U/en active Active
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