Noctilucent TPU (Thermoplastic Polyurethane) transparent paint surface protective film and manufacturing method thereof

Abstract

The invention discloses a noctilucent TPU (thermoplastic polyurethane) transparent paint surface protective film and a manufacturing method thereof, and belongs to the technical field of paint surface protective films, the noctilucent TPU transparent paint surface protective film specifically comprises the following raw materials by mass: 15% of a prepolymer of poly epsilon-caprolactone polyol and 4, 4-dicyclohexylmethane diisocyanate; 10% of a prepolymer of a diamine chain extension cross-linking agent and 4, 4-dicyclohexylmethane diisocyanate; 0.2% of a mildew preventive; 0.5 part of pentaerythritol ester; 0.5% of 2, 6-di-tert-butyl-4-methylphenol, and the balance of water; 0.18 to 0.4 percent of an organic tin catalyst; 0.25 to 2.5% of an anti-hydrolysis agent; 0.1%-0.5% of a release agent; 0.2%-0.5% of an ultraviolet absorbent; 0.2%-0.5% of a light stabilizer; 0.5% of pearlescent sheets; the balance is an organic solvent; according to the noctilucent TPU transparent paint surface protective film and the manufacturing method thereof, the paint surface protective film has noctilucent safety prompting performance, the visibility of a vehicle can be improved when the vehicle runs at night or under a low-light condition, and a warning effect on pedestrians and the vehicle is achieved, so that the safety performance of the vehicle in the running process is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of paint surface protection films, and in particular relates to a luminous TPU transparent paint surface protection film and a manufacturing method thereof. Background Art

[0002] Car paint protection film, also known as "invisible car cover", is a transparent protective film attached to the paint on the surface of the car to protect the original car paint from damage. The product has strong toughness and self-repairing function, which can effectively prevent scratches and sand from hitting, and also isolates the car paint from contact with the air, and can prevent acid rain, asphalt, bird droppings, etc. from damaging the paint surface. At the same time, the paint protection film is high-definition and high-gloss, which can improve and protect the color and gloss of the car paint surface.

[0003] Existing car paint protection films generally play the role of improving and protecting the color and gloss of the car paint, but are relatively lacking in safety performance. When a vehicle is driving, it generally warns pedestrians and vehicles through its own lights and external lights, but the paint protection film itself does not have a warning function, which reduces the visibility of the vehicle when the vehicle is driving at night or in low light conditions.

[0004] Therefore, it is necessary to provide a luminous TPU transparent paint surface protective film and a preparation method thereof to solve the above-mentioned technical problems. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a luminous TPU transparent paint surface protective film and a manufacturing method thereof, which has the characteristics of luminous safety prompt performance.

[0006] To achieve the above object, the present invention provides the following technical solution: a luminous TPU transparent paint surface protective film and a method for making the same, comprising the following raw materials in percentage by mass: Prepolymer of poly-ε-caprolactone polyol and 4,4-dicyclohexylmethane diisocyanate 15%; Prepolymer of diamine chain extender and crosslinker and 4,4-dicyclohexylmethane diisocyanate 10%; Antifungal agent 0.2%; Pentaerythritol ester 0.5; 2,6-di-tert-butyl-4-methylphenol 0.5%; Organic tin catalyst 0.18~0.4%; Anti-hydrolysis agent 0.25~2.5%; Release agent 0.1~0.5%; UV absorber 0.2~0.5%; Light stabilizer 0.2~0.5%; Pearlescent flakes 0.5%; The balance is organic solvent.

[0007] Preferably, the molecular weight of the poly-ε-caprolactone polyol and 4,4-dicyclohexylmethane diisocyanate prepolymer is 1800-2200.

[0008] Preferably, the organotin catalyst is stannous octoate.

[0009] Preferably, the anti-hydrolysis agent is a polycarbodiimide compound.

[0010] Preferably, the release agent is a fatty acid solution of stearic zinc.

[0011] Preferably, the stoichiometric ratio of the pentaerythritol ester to 2,6-di-tert-butyl-4-methylphenol is 1:1.

[0012] Preferably, the stoichiometric ratio of the ultraviolet absorber to the light stabilizer is 1:1.

[0013] Preferably, the pearlescent flakes have a particle size of 20-40 um.

[0014] Preferably, the method for making the luminous TPU transparent paint protective film comprises the following steps: S1: Mix poly-ε-caprolactone polyol with a prepolymer of 4,4-dicyclohexylmethane diisocyanate, a mildew preventer, pentaerythritol ester, 2,6-di-tert-butyl-4-methylphenol, an organic tin catalyst, an anti-hydrolysis agent, a release agent, an ultraviolet absorber, a light stabilizer and pearlescent flakes, heat to 80° C. and stir evenly; S2: heating the prepolymer of diamine chain extender and 4,4-dicyclohexylmethane diisocyanate to 80° C.; S3: S1 and S2 are mixed and stirred evenly in proportion by a metering pump; S4: Print the conductive adhesive circuit evenly on PET with a thickness of 36-50um and acrylic release agent by gravure coating, and arrange the small SMD lamp beads; S5: Heat the mixed solution to 80°C, and apply the coating to the PET with the lamp bead surface in S3 by a comma coating method with a heating device, with a coating thickness of 350um~400um and a comma spacing of 420um~470um; S6: Control the coating and drying temperature to 130°C to 30°C, the humidity to less than 20%, and the reaction time to be greater than or equal to 3 minutes; S7: Place the coated base film in a 50°C room for aging for 3 days; S8: Because the high molecular weight TPU base film has light-conducting properties, light-conducting ink is used to print personalized decorative patterns on the surface of the cast base film; S9: using a transfer coating machine to coat acrylic glue and protective coating on both sides of the cast TPU base film; S10: Stick it on the car paint surface, configure the corresponding power supply and turn it on. Turn on the power at night. The lamp beads will emit light through the light-guiding cast TPU. When the light passes through the light-guiding ink, the light-guiding ink will guide and radiate the light, so that the naked eye can receive the luminous pattern.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The luminous TPU transparent paint protection film and its manufacturing method enable the paint protection film to have luminous safety warning performance, which can improve the visibility of the vehicle when the vehicle is driving at night or in low light conditions, and serve as a warning to pedestrians and vehicles, thereby further improving the safety performance of the vehicle during driving. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Example 1 The present embodiment provides the following technical scheme: a luminous TPU transparent paint protective film and a method for making the same, comprising the following raw materials in percentage by mass: 15% prepolymer of poly-ε-caprolactone polyol and 4,4-dicyclohexylmethane diisocyanate; 10% prepolymer of diamine chain extender cross-linking agent and 4,4-dicyclohexylmethane diisocyanate; 0.2% mildew preventer; 0.5% pentaerythritol ester; 0.5% 2,6-di-tert-butyl-4-methylphenol; 0.18-0.4% organotin catalyst; 0.25-2.5% anti-hydrolysis agent; 0.1-0.5% release agent; 0.2-0.5% ultraviolet absorber; 0.2-0.5% light stabilizer; 0.5% pearlescent flakes; the balance being organic solvent.

[0018] The method for making the luminous TPU transparent paint protective film comprises the following steps: S1: Mix poly-ε-caprolactone polyol with a prepolymer of 4,4-dicyclohexylmethane diisocyanate, a mildew preventer, pentaerythritol ester, 2,6-di-tert-butyl-4-methylphenol, an organic tin catalyst, an anti-hydrolysis agent, a release agent, an ultraviolet absorber, a light stabilizer and pearlescent flakes, heat to 80° C. and stir evenly; S2: heating the prepolymer of diamine chain extender and 4,4-dicyclohexylmethane diisocyanate to 80° C.; S3: S1 and S2 are mixed and stirred evenly in proportion by a metering pump; S4: Print the conductive adhesive circuit evenly on PET with a thickness of 36-50um and acrylic release agent by gravure coating, and arrange the small SMD lamp beads; S5: Heat the mixed solution to 80°C, and apply the coating to the PET with the lamp bead surface in S3 by a comma coating method with a heating device, with a coating thickness of 350um~400um and a comma spacing of 420um~470um; S6: Control the coating and drying temperature to 130°C to 30°C, the humidity to less than 20%, and the reaction time to be greater than or equal to 3 minutes; S7: Place the coated base film in a 50°C room for aging for 3 days; S8: Because the high molecular weight TPU base film has light-conducting properties, light-conducting ink is used to print personalized decorative patterns on the surface of the cast base film; S9: using a transfer coating machine to coat acrylic glue and protective coating on both sides of the cast TPU base film; S10: Stick it on the car paint surface, configure the corresponding power supply and turn it on. Turn on the power at night. The lamp beads will emit light through the light-guiding cast TPU. When the light passes through the light-guiding ink, the light-guiding ink will guide and radiate the light, so that the naked eye can receive the luminous pattern.

[0019] The luminous TPU transparent paint protection film and its manufacturing method enable the paint protection film to have luminous safety warning performance, which can improve the visibility of the vehicle when the vehicle is driving at night or in low light conditions, and serve as a warning to pedestrians and vehicles, thereby further improving the safety performance of the vehicle during driving.

[0020] In some embodiments, the organotin catalyst is stannous octoate, which has the characteristics of high catalytic efficiency, mild reaction conditions, easy handling and strong applicability.

[0021] The anti-hydrolysis agent adopts a polycarbodiimide compound, which can control the reaction rate, has mild reaction conditions, good water solubility, high stability and good biocompatibility.

[0022] The release agent adopts fatty acid solution of stearic zinc, which can be more easily dispersed evenly and enhances the functionality of the product, as well as having environmental protection and stability effects.

[0023] Example 2 The molecular weight of poly-ε-caprolactone polyol and 4,4-dicyclohexylmethane diisocyanate prepolymer is 1800~2200. As the soft segment in polyurethane material, the lower molecular weight of poly-ε-caprolactone polyol means that it has better flexibility and processing performance. The soft segment usually gives polyurethane elasticity, flexibility and low-temperature performance.

[0024] Example 3 The stoichiometric ratio of pentaerythritol ester and 2,6-di-tert-butyl-4-methylphenol is 1:1, which can maximize the synergistic effect of pentaerythritol ester and 2,6-di-tert-butyl-4-methylphenol in the process of producing paint protective film, improve the stability of the antioxidant, balance the antioxidant performance, improve the compatibility of the antioxidant, and reduce the toxicity risk that may be caused by a single antioxidant.

[0025] Example 4 The stoichiometric ratio of UV absorber to light stabilizer is 1:1. By using the same ratio of UV absorber to light stabilizer, more comprehensive protection can be provided for the paint protective film, extending its service life in outdoor or light environments, as well as reducing costs and light aging problems.

[0026] Example 5 The pearlescent flakes have a particle size of 20~40um, which makes the paint protection film have beautiful appearance, uniform gloss, good concealment, good durability, high UV resistance, easy processing and convenient maintenance.

[0027] The working principle of the present invention is as follows: S1: poly-ε-caprolactone polyol is mixed with a prepolymer of 4,4-dicyclohexylmethane diisocyanate, a mildew preventer, pentaerythritol ester, 2,6-di-tert-butyl-4-methylphenol, an organic tin catalyst, an anti-hydrolysis agent, a release agent, an ultraviolet absorber, a light stabilizer and pearlescent flakes, heated to 80°C and stirred evenly; S2: heating the prepolymer of diamine chain extender and 4,4-dicyclohexylmethane diisocyanate to 80° C.; S3: S1 and S2 are mixed and stirred evenly in proportion by a metering pump; S4: Print the conductive adhesive circuit evenly on PET with a thickness of 36-50um and acrylic release agent by gravure coating, and arrange the small SMD lamp beads; S5: Heat the mixed solution to 80°C, and apply the coating to the PET with the lamp bead surface in S3 by a comma coating method with a heating device, with a coating thickness of 350um~400um and a comma spacing of 420um~470um; S6: Control the coating and drying temperature to 130°C to 30°C, the humidity to less than 20%, and the reaction time to be greater than or equal to 3 minutes; S7: Place the coated base film in a 50°C room for aging for 3 days; S8: Because the high molecular weight TPU base film has light-conducting properties, light-conducting ink is used to print personalized decorative patterns on the surface of the cast base film; S9: using a transfer coating machine to coat acrylic glue and protective coating on both sides of the cast TPU base film; S10: Stick it on the car paint surface, configure the corresponding power supply and turn it on. Turn on the power at night. The lamp beads will emit light through the light-guiding cast TPU. When the light passes through the light-guiding ink, the light-guiding ink will guide and radiate the light, so that the naked eye can receive the luminous pattern.

[0028] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Luminous TPU transparent paint protective film, characterized by: The following raw materials are included in mass percentage: Prepolymer of poly-ε-caprolactone polyol and 4,4-dicyclohexylmethane diisocyanate 15%; Prepolymer of diamine chain extender and crosslinker and 4,4-dicyclohexylmethane diisocyanate 10%; Antifungal agent 0.2%; Pentaerythritol ester 0.5; 2,6-di-tert-butyl-4-methylphenol 0.5%; Organic tin catalyst 0.18~0.4%; Anti-hydrolysis agent 0.25~2.5%; Release agent 0.1~0.5%; UV absorber 0.2~0.5%; Light stabilizer 0.2~0.5%; Pearlescent flakes 0.5%; The balance is organic solvent.

2. The luminous TPU transparent paint protective film according to claim 1, characterized in that: The molecular weight of the poly-ε-caprolactone polyol and 4,4-dicyclohexylmethane diisocyanate prepolymer is 1800-2200.

3. The luminous TPU transparent paint protective film according to claim 1, characterized in that: The organotin catalyst is stannous octoate.

4. The luminous TPU transparent paint protective film according to claim 1, characterized in that: The anti-hydrolysis agent is a polycarbodiimide compound.

5. The luminous TPU transparent paint protective film according to claim 1, characterized in that: The release agent is a fatty acid solution of stearic zinc.

6. The luminous TPU transparent paint protective film according to claim 1, characterized in that: The stoichiometric ratio of the pentaerythritol ester to 2,6-di-tert-butyl-4-methylphenol is 1:

1.

7. The luminous TPU transparent paint protective film according to claim 1, characterized in that: The stoichiometric ratio of the ultraviolet absorber to the light stabilizer is 1:

1.

8. The luminous TPU transparent paint protective film according to claim 1, characterized in that: The pearlescent flakes have a particle size of 20-40 um.

9. The method for preparing the luminous TPU transparent paint protective film according to any one of claims 1 to 8 comprises the following steps: S1: Mix poly-ε-caprolactone polyol with a prepolymer of 4,4-dicyclohexylmethane diisocyanate, a mildew preventer, pentaerythritol ester, 2,6-di-tert-butyl-4-methylphenol, an organic tin catalyst, an anti-hydrolysis agent, a release agent, an ultraviolet absorber, a light stabilizer and pearlescent flakes, heat to 80° C. and stir evenly; S2: heating the prepolymer of diamine chain extender and 4,4-dicyclohexylmethane diisocyanate to 80° C.; S3: S1 and S2 are mixed and stirred evenly in proportion by a metering pump; S4: Print the conductive adhesive circuit evenly on PET with a thickness of 36-50um and acrylic release agent by gravure coating, and arrange the small SMD lamp beads; S5: Heat the mixed solution to 80°C, and apply the coating to the PET with the lamp bead surface in S3 by a comma coating method with a heating device, with a coating thickness of 350um~400um and a comma spacing of 420um~470um; S6: Control the coating and drying temperature to 130°C to 30°C, the humidity to less than 20%, and the reaction time to be greater than or equal to 3 minutes; S7: Place the coated base film in a 50°C room for aging for 3 days; S8: Because the high molecular weight TPU base film has light-conducting properties, light-conducting ink is used to print personalized decorative patterns on the surface of the cast base film; S9: using a transfer coating machine to coat acrylic glue and protective coating on both sides of the cast TPU base film; S10: Stick it on the car paint surface, configure the corresponding power supply and turn it on. Turn on the power at night. The lamp beads will emit light through the light-guiding cast TPU. When the light passes through the light-guiding ink, the light-guiding ink will guide and radiate the light, so that the naked eye can receive the luminous pattern.