Weather-resistant prism type reflective film and preparation process thereof

Abstract

The weather-resistant prism type reflective film comprises a release layer, a supporting layer, a packaging layer, a microprism layer and a weather-resistant surface layer which are sequentially arranged from bottom to top, reflective patterns are formed on the opposite faces of the packaging layer and the microprism layer, and the supporting layer comprises a hot melt adhesive layer and a foaming silica gel layer which are sequentially arranged; the weather-resistant surface layer is prepared from the following raw materials: polyurethane acrylate, 1, 6-hexanediol diacrylate, epoxy acrylate, a mixed photoinitiator, a flatting agent, trimethylolpropane trimethacrylate, polyethylene glycol ether, dibutyltin dilaurate and polydimethylsiloxane. According to the application, the weather-resistant layer is arranged on the microprism layer; the raw material composition of the weather-resistant layer is further limited, polyurethane acrylate is used as a main raw material, and epoxy acrylate and trimethylolpropane trimethacrylate are introduced for cooperation, so that the aging resistance of the weather-resistant layer is effectively improved, the weather resistance of the weather-resistant layer is improved, and the service life of the reflective film is further prolonged.

Description

Technical Field

[0001] The present invention belongs to the field of preparation of reflective films, and particularly relates to a weather-resistant prism-type reflective film and its preparation process. Background Art

[0002] In the modern transportation system, traffic safety has become a crucial issue, especially with the rapid increase in road traffic and the number of vehicles. In this context, reflective film materials play a vital role. It is mainly used to make traffic safety signs, industrial warning signs, and vehicle license plates to improve the safety of pedestrians and drivers. Traffic safety signs are the infrastructure for road safety, and they guide drivers and pedestrians to abide by traffic rules, remind potential dangers, or indicate driving directions through patterns and words.

[0003] Since these signs are located outdoors, they must be clearly visible under different weather and light conditions. Reflective films can effectively reflect light, making traffic signs still clearly visible at night or in low-light environments, greatly improving traffic safety. Currently, reflective films located outdoors are easily eroded by external environmental factors such as oxidation and moisture, causing damage to the reflective films, further shortening the effective service life of the products, and thus need to be further improved. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a weather-resistant prism-type reflective film and its preparation process.

[0005] The present invention adopts the following technical solutions: A weather-resistant prism-type reflective film, comprising a release layer, a support layer, a packaging layer, a micro-prism layer, and a weather-resistant surface layer arranged in sequence from bottom to top. A reflective pattern is formed on the opposite surface of the packaging layer and the micro-prism layer. The support layer includes a hot melt adhesive layer and a foamed silicone layer arranged in sequence; The weather-resistant surface layer is composed of the following raw materials in parts by weight: 45-55 parts of polyurethane acrylate, 20-30 parts of 1,6-hexanediol diacrylate, 10-15 parts of epoxy acrylate, 3-4 parts of a mixed photoinitiator, 0.5-1 part of a leveling agent, 2-3 parts of trimethylolpropane trimethacrylate, 1-2 parts of polyethylene glycol ether, 0.5-1 part of dibutyltin dilaurate, and 1-2 parts of polydimethylsiloxane.

[0006] Further, the mixed photoinitiator is composed of 2-hydroxy-2-methylpropiophenone, ethyl 2,4,6-trimethylbenzoyl phenylphosphinate, and benzoin ethyl ether in a volume ratio of 1:0.5-0.6:0.1-0.15.

[0007] Further, the encapsulation layer is composed of the following raw materials in parts by weight: 70-80 parts of methyl methacrylate, 20-30 parts of terpene resin, 18-22 parts of titanium dioxide, 3-5 parts of polyvinyl butyral, 6-8 parts of benzoyl peroxide, and 2-3 parts of glycidyl methacrylate.

[0008] Further, the leveling agent is polyether-modified silicone oil.

[0009] Further, the microprism layer includes a substrate layer and prism units formed on the bottom surface of the substrate layer, and the weather-resistant surface layer is disposed on the top surface of the substrate layer.

[0010] A preparation process of a weather-resistant prism-type reflective film specifically includes the following steps: Step 1, coat the encapsulation layer slurry on the release film by coating. After curing and forming, print a pattern on its surface so that its surface is divided into sticky and non-sticky parts, and the non-sticky part forms the reflective pattern. Tear off the release film to obtain the encapsulation layer; Step 2, compound the prepared encapsulation layer with the prism units of the microprism layer under the action of a compounding roller to form a semi-finished product; Step 3, coat the weather-resistant layer slurry on the other side of the microprism layer and cure to form the weather-resistant layer; Step 4, coat hot melt adhesive on the release layer, cure to form a hot melt adhesive layer, and then calender and form a silicone layer on the release film by calendering. Bake and cure and foam through a baking channel to obtain a foamed silicone layer; Step 5, compound the hot melt adhesive layer with the foamed silicone layer. After tearing off the release film, thermocompression bond the other side of the foamed silicone layer with the encapsulation layer to obtain the weather-resistant prism-type reflective film.

[0011] Further, the coating thickness of the encapsulation layer slurry is 6-8C.

[0012] Further, the preparation method of the microprism layer is as follows: coat UV resin on the surface of a PVC film, heat it through a steel roller, then press it into a mold belt, and then cure it with ultraviolet light to form prism units to obtain the microprism layer.

[0013] Further, the thermocompression bonding temperature of the encapsulation layer and the foamed silicone layer is 150-170 °C, and the thermocompression bonding time is 12-18S.

[0014] As can be seen from the above description of the present invention, compared with the prior art, the beneficial effects of the present invention are as follows: By providing a weather-resistant layer on the microprism layer and further defining the raw material composition of the weather-resistant layer, with polyurethane acrylate as the main raw material and introducing epoxy acrylate and trimethylolpropane trimethacrylate for cooperation, the anti-aging performance of the weather-resistant layer itself is effectively improved, the weather resistance of the weather-resistant layer is enhanced, and thus the service life of the reflective film is extended; adding 1,6-hexanediol diacrylate in cooperation with other raw materials can improve the adhesion between the weather-resistant layer and the microprism layer, making the weather-resistant layer stably compounded on the microprism layer; among them, the composition of the mixed photoinitiator is specifically defined to improve the curing speed and curing degree of the weather-resistant layer, and further improve the quality and service life of the reflective film. Specifically define the structural composition of the encapsulation layer, with methyl methacrylate as the main raw material and introducing terpene resin and polyvinyl butyral for cooperation, so as to make the initial adhesion and holding adhesion of the encapsulation layer ensure the adhesion between the encapsulation layer and the prism layer and the support layer, guarantee the stability of the adhesion between the microprism layer, the encapsulation layer and the support layer, prevent the support layer from being torn off together with the release paper, and improve the service life of the reflective film. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a structural cross-sectional view of the reflective film; In the figure, 1 - release layer, 2 - support layer, 3 - encapsulation layer, 4 - microprism layer, 5 - weather-resistant surface layer, 6 - reflective pattern, 21 - hot melt adhesive layer, 22 - foamed silica gel layer, 41 - substrate layer, 42 - prism unit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The present invention will be further described below through specific embodiments.

[0017] A weather-resistant prism-type reflective film includes a release layer 1, a support layer 2, an encapsulation layer 3, a microprism layer 4, and a weather-resistant surface layer 5 arranged in sequence from bottom to top. Specifically, a reflective pattern 6 is formed on the opposite surface of the encapsulation layer 3 and the microprism layer 4. The support layer 2 includes a hot melt adhesive layer 21 and a foamed silica gel layer 22 arranged in sequence; the microprism layer 4 includes a substrate layer 41 and prism units 42 formed on the bottom surface of the substrate layer 41. Among them, the weather-resistant surface layer 5 is arranged on the top surface of the substrate layer 41; further, the substrate layer 41 is a PVC film, and the reflective pattern 6 is screen-printed on the surface of the encapsulation layer 3 with acrylate-based white resin.

[0018] Weather-resistant surface layer 5, which is composed of the following raw materials in parts by weight: 45-55 parts of polyurethane acrylate, 20-30 parts of 1,6-hexanediol diacrylate, 10-15 parts of epoxy acrylate, 3-4 parts of mixed photoinitiator, 0.5-1 part of polyether-modified silicone oil, 2-3 parts of trimethylolpropane trimethacrylate, 1-2 parts of polyethylene glycol ether, 0.5-1 part of dibutyltin dilaurate, 1-2 parts of polydimethylsiloxane; among them, the mixed photoinitiator is composed of 2-hydroxy-2-methylpropiophenone, ethyl 2,4,6-trimethylbenzoyl phenylphosphinate, and benzoin ethyl ether in a volume ratio of 1:0.5-0.6:0.1-0.15.

[0019] Encapsulation layer 3, which is composed of the following raw materials in parts by weight: 70-80 parts of methyl methacrylate, 20-30 parts of terpene resin, 18-22 parts of titanium dioxide, 3-5 parts of polyvinyl butyral, 6-8 parts of benzoyl peroxide, 2-3 parts of glycidyl methacrylate.

[0020] A preparation process of a weather-resistant prismatic reflective film specifically includes the following steps: Step 1, coat UV resin on the surface of the PVC film, after heating by a steel roller, mold it into a mold belt, and then cure it by ultraviolet light to form a prism unit 42, thus obtaining the micro-prism layer 4. Step 2, coat a layer of encapsulation layer slurry with a thickness of 6-8C on the release film by coating. After curing and forming, print a pattern on its surface so that its surface is divided into sticky and non-sticky parts, and the non-sticky part forms the reflective pattern 6. Tear off the release film to obtain the encapsulation layer 3. Step 3, compound the prepared encapsulation layer 3 and the prism unit 42 of the micro-prism layer 4 under the action of a compounding roller to form a semi-finished product. Step 4, coat a weather-resistant layer slurry on the other side of the micro-prism layer 4 and cure it to form a weather-resistant layer 5. Step 5, coat hot melt adhesive on the release layer 1 and cure it to form a hot melt adhesive layer 21. Then, roll a silicone layer on the release film by calendering, bake it in a baking oven for curing and foaming to obtain a foamed silicone layer 22. Step 6, compound the hot melt adhesive layer 21 and the foamed silicone layer 22. After tearing off the release film, thermocompression bond the other side of the foamed silicone layer 22 with the encapsulation layer 3 at a thermocompression temperature of 150-170°C and a thermocompression time of 12-18S to obtain the weather-resistant prismatic reflective film.

[0021] Example 1 A weather-resistant prismatic reflective film, comprising, from bottom to top, a release layer 1, a support layer 2, a packaging layer 3, a micro-prism layer 4, and a weather-resistant surface layer 5. Specifically, a reflective pattern 6 is formed on the opposite surface of the packaging layer 3 and the micro-prism layer 4. The support layer 2 includes a hot melt adhesive layer 21 and a foamed silica gel layer 22 arranged in sequence. The micro-prism layer 4 includes a substrate layer 41 and prism units 42 formed on the bottom surface of the substrate layer 41. Among them, the weather-resistant surface layer 5 is arranged on the top surface of the substrate layer 41. Further, the substrate layer 41 is a PVC film.

[0022] The weather-resistant surface layer is composed of the following raw materials in parts by weight: 45 parts of polyurethane acrylate, 30 parts of 1,6-hexanediol diacrylate, 15 parts of epoxy acrylate, 3 parts of a mixed photoinitiator, 1 part of polyether-modified silicone oil, 2 parts of trimethylolpropane trimethacrylate, 2 parts of polyethylene glycol ether, 0.5 part of dibutyltin dilaurate, and 2 parts of polydimethylsiloxane. Among them, the mixed photoinitiator is composed of 2-hydroxy-2-methylpropiophenone, ethyl 2,4,6-trimethylbenzoyl phenylphosphinate, and benzoin ethyl ether in a volume ratio of 1:0.5:0.15.

[0023] The packaging layer is composed of the following raw materials in parts by weight: 70 parts of methyl methacrylate, 30 parts of terpene resin, 18 parts of titanium dioxide, 5 parts of polyvinyl butyral, 6 parts of benzoyl peroxide, and 3 parts of glycidyl methacrylate.

[0024] A preparation process for a weather-resistant prismatic reflective film specifically includes the following steps: Step 1: Coat a UV resin on the surface of the PVC film. After heating by a steel roller, it is brought into a mold belt by pressing, and then cured by ultraviolet light to form prism units, obtaining the micro-prism layer. Step 2: Coat a layer of packaging layer slurry with a thickness of 6C on the release film by coating. After curing and forming, print a pattern on its surface so that its surface is divided into adhesive and non-adhesive parts, and the non-adhesive part forms the reflective pattern. Tear off the release film to obtain the packaging layer. Step 3: The prepared packaging layer and the prism units of the micro-prism layer are compounded under the action of a compounding roller to form a semi-finished product. Step 4: Coat a weather-resistant layer slurry on the other side of the micro-prism layer and cure to form a weather-resistant layer. Step 5: Coat a hot melt adhesive on the release layer and cure to form a hot melt adhesive layer. Then, by calendering, a silica gel layer is calendered and formed on the release film, and then baked in a baking channel to be cured and foamed to obtain a foamed silica gel layer. Step 6: Compound the hot melt adhesive layer and the foamed silica gel layer. After tearing off the release film, the other side of the foamed silica gel layer is hot-pressed and compounded with the packaging layer at a hot-pressing temperature of 150 °C and a hot-pressing time of 18 s to obtain the weather-resistant prismatic reflective film.

[0025] Example 2 A weather-resistant prism-type reflective film, comprising a release layer 1, a support layer 2, a packaging layer 3, a micro-prism layer 4, and a weather-resistant surface layer 5 arranged in sequence from bottom to top. Specifically, a reflective pattern 6 is formed on the opposite surface of the packaging layer 3 and the micro-prism layer 4. The support layer 2 includes a hot melt adhesive layer 21 and a foamed silica gel layer 22 arranged in sequence. The micro-prism layer 4 includes a substrate layer 41 and prism units 42 formed on the bottom surface of the substrate layer 41. Among them, the weather-resistant surface layer 5 is arranged on the top surface of the substrate layer 41. Further, the substrate layer 41 is a PVC film.

[0026] The weather-resistant surface layer is composed of the following raw materials in parts by weight: 55 parts of polyurethane acrylate, 20 parts of 1,6-hexanediol diacrylate, 10 parts of epoxy acrylate, 4 parts of a mixed photoinitiator, 0.5 part of polyether-modified silicone oil, 3 parts of trimethylolpropane trimethacrylate, 1 part of polyethylene glycol ether, 1 part of dibutyltin dilaurate, and 1 part of polydimethylsiloxane. Among them, the mixed photoinitiator is composed of 2-hydroxy-2-methylpropiophenone, ethyl 2,4,6-trimethylbenzoyl phenylphosphinate, and benzoin ethyl ether in a volume ratio of 1:0.6:0.1.

[0027] The packaging layer is composed of the following raw materials in parts by weight: 80 parts of methyl methacrylate, 20 parts of terpene resin, 22 parts of titanium dioxide, 3 parts of polyvinyl butyral, 8 parts of benzoyl peroxide, and 2 parts of glycidyl methacrylate.

[0028] A preparation process of a weather-resistant prism-type reflective film specifically includes the following steps: Step 1: Coating UV resin on the surface of the PVC film, heating through a steel roller, then pressing it into a mold belt, and then curing it by ultraviolet light to form prism units, obtaining the micro-prism layer. Step 2: Coating a layer of packaging layer slurry with a thickness of 8C on the release film by coating. After curing and forming, printing a pattern on its surface to make its surface divided into sticky and non-sticky parts, and the non-sticky part forms the reflective pattern. Tearing off the release film, obtaining the packaging layer. Step 3: Compositing the prepared packaging layer and the prism units of the micro-prism layer under the action of a composite roller to form a semi-finished product. Step 4: Coating a weather-resistant layer slurry on the other side of the micro-prism layer and curing to form a weather-resistant layer. Step 5: Coating hot melt adhesive on the release layer and curing to form a hot melt adhesive layer. Then, rolling and forming a silica gel layer on the release film by calendering, baking and curing, foaming through a baking channel to obtain a foamed silica gel layer. Step 6: Compositing the hot melt adhesive layer and the foamed silica gel layer, tearing off the release film, and then thermally pressing and compositing the other side of the foamed silica gel layer with the packaging layer at a thermal pressing temperature of 170 °C and a thermal pressing time of 12S to obtain the weather-resistant prism-type reflective film.

[0029] Example 3 A weather-resistant prismatic reflective film, which includes a release layer 1, a support layer 2, a packaging layer 3, a micro-prism layer 4, and a weather-resistant surface layer 5 arranged in sequence from bottom to top. Specifically, a reflective pattern 6 is formed on the opposite surface of the packaging layer 3 and the micro-prism layer 4. The support layer 2 includes a hot melt adhesive layer 21 and a foamed silicone layer 22 arranged in sequence. The micro-prism layer 4 includes a substrate layer 41 and prism units 42 formed on the bottom surface of the substrate layer 41. Among them, the weather-resistant surface layer 5 is arranged on the top surface of the substrate layer 41. Further, the substrate layer 41 is a PVC film.

[0030] The weather-resistant surface layer is composed of the following raw materials in parts by weight: 50 parts of polyurethane acrylate, 25 parts of 1,6-hexanediol diacrylate, 12 parts of epoxy acrylate, 3.5 parts of a mixed photoinitiator, 0.8 part of polyether-modified silicone oil, 2.5 parts of trimethylolpropane trimethacrylate, 1.5 parts of polyethylene glycol ether, 0.8 part of dibutyltin dilaurate, and 1.5 parts of polydimethylsiloxane. Among them, the mixed photoinitiator is composed of 2-hydroxy-2-methylpropiophenone, ethyl 2,4,6-trimethylbenzoyl phenylphosphinate, and benzoin ethyl ether in a volume ratio of 1:0.55:0.12.

[0031] The packaging layer is composed of the following raw materials in parts by weight: 75 parts of methyl methacrylate, 25 parts of terpene resin, 20 parts of titanium dioxide, 4 parts of polyvinyl butyral, 7 parts of benzoyl peroxide, and 2.5 parts of glycidyl methacrylate.

[0032] A preparation process of a weather-resistant prismatic reflective film specifically includes the following steps: Step 1, coat UV resin on the surface of the PVC film. After heating through a steel roller, it is brought into a mold belt by molding, and then cured by ultraviolet light to form prism units, obtaining the micro-prism layer. Step 2, coat a layer of packaging layer slurry with a thickness of 7C on the release film by coating. After curing and forming, print a pattern on its surface so that its surface is divided into adhesive and non-adhesive parts, and the non-adhesive part forms the reflective pattern. Tear off the release film to obtain the packaging layer. Step 3, compound the prepared packaging layer and the prism units of the micro-prism layer under the action of a compounding roller to form a semi-finished product. Step 4, coat weather-resistant layer slurry on the other side of the micro-prism layer and cure to form a weather-resistant layer. Step 5, coat hot melt adhesive on the release layer and cure to form a hot melt adhesive layer. Then, roll a silicone layer on the release film by calendering, bake and cure it in an oven to foam, obtaining a foamed silicone layer. Step 6, compound the hot melt adhesive layer and the foamed silicone layer. After tearing off the release film, thermocompression bond the other side of the foamed silicone layer with the packaging layer at a thermocompression temperature of 160 °C and a thermocompression time of 15S to obtain the weather-resistant prismatic reflective film.

[0033] In this application, a weather-resistant layer is provided on the microprism layer, and the raw material composition of the weather-resistant layer is further defined. Using polyurethane acrylate as the main raw material and introducing epoxy acrylate and trimethylolpropane trimethacrylate in combination can effectively improve the anti-aging performance of the weather-resistant layer itself, enhance the weather resistance of the weather-resistant layer, and further extend the service life of the reflective film. Adding 1,6-hexanediol diacrylate in combination with other raw materials can improve the adhesion between the weather-resistant layer and the microprism layer, enabling the weather-resistant layer to be stably compounded on the microprism layer. Among them, the composition of the mixed photoinitiator is specifically defined to increase the curing speed and curing degree of the weather-resistant layer, and further improve the quality and service life of the reflective film.

[0034] The above are only the preferred embodiments of the present invention, and thus cannot limit the scope of implementation of the present invention. That is, equivalent changes and modifications made according to the scope of the present invention application and the content of the specification should still fall within the scope covered by the present invention application.

Claims

1. A weather-resistant prismatic reflective film, characterized in that: It includes a release layer, a support layer, a packaging layer, a microprism layer, and a weather-resistant surface layer arranged successively from bottom to top. A reflective pattern is formed on the opposite surface of the packaging layer and the microprism layer. The support layer includes a hot melt adhesive layer and a foamed silica gel layer arranged successively. The weather-resistant surface layer is composed of the following raw materials in parts by weight: 45-55 parts of polyurethane acrylate, 20-30 parts of 1,6-hexanediol diacrylate, 10-15 parts of epoxy acrylate, 3-4 parts of a mixed photoinitiator, 0.5-1 part of a leveling agent, 2-3 parts of trimethylolpropane trimethacrylate, 1-2 parts of polyethylene glycol ether, 0.5-1 part of dibutyltin dilaurate, and 1-2 parts of polydimethylsiloxane.

2. The weather-resistant prism-type reflective film according to claim 1, characterized in that: The mixed photoinitiator is composed of 2-hydroxy-2-methylpropiophenone, ethyl 2,4,6-trimethylbenzoyl phenylphosphinate, and benzoin ethyl ether in a volume ratio of 1:0.5-0.6:0.1-0.

15.

3. A weather-resistant prismatic reflective film according to claim 1, characterized in that: The packaging layer is composed of the following raw materials in parts by weight: 70-80 parts of methyl methacrylate, 20-30 parts of terpene resin, 18-22 parts of titanium dioxide, 3-5 parts of polyvinyl butyral, 6-8 parts of benzoyl peroxide, and 2-3 parts of glycidyl methacrylate.

4. The weather-resistant prism-type reflective film according to claim 1, characterized in that: The leveling agent is polyether-modified silicone oil.

5. A weather-resistant prismatic reflective film according to claim 1, wherein: The microprism layer includes a substrate layer and prism units formed on the bottom surface of the substrate layer. The weather-resistant surface layer is arranged on the top surface of the substrate layer.

6. The preparation process of a weather-resistant prism-type reflective film according to claim 1, characterized in that: Specifically, it includes the following steps: Step 1: Coat the packaging layer slurry on the release film by coating. After curing and forming, print a pattern on its surface so that its surface is divided into sticky and non-sticky parts, and the non-sticky part forms the reflective pattern. Tear off the release film to obtain the packaging layer. Step 2: Combine the prepared packaging layer and the prism units of the microprism layer under the action of a composite roller to form a semi-finished product. Step 3: Coat the weather-resistant layer slurry on the other side of the microprism layer and cure to form the weather-resistant layer. Step 4: Coat hot melt adhesive on the release layer and cure to form a hot melt adhesive layer. Then, by calendering, calender and form a silica gel layer on the release film, and bake and foam through a baking channel to obtain a foamed silica gel layer. Step 5: Combine the hot melt adhesive layer and the foamed silica gel layer. After tearing off the release film, thermocompression bond the other side of the foamed silica gel layer with the packaging layer to obtain the weather-resistant prism-shaped reflective film.

7. The preparation process of a weather-resistant prism-type reflective film according to claim 6, characterized in that: The coating thickness of the packaging layer slurry is 6-8C.

8. The preparation process of a weather-resistant prism-type reflective film according to claim 6, characterized in that: The preparation method of the microprism layer is as follows: Coat UV resin on the surface of a PVC film. After heating by a steel roller, press it into a mold belt, and then cure it with ultraviolet light to form prism units to obtain the microprism layer.

9. The preparation process of a weather-resistant prism-type reflective film according to claim 6, characterized in that: The thermocompression bonding temperature between the packaging layer and the foamed silica gel layer is 150-170°C, and the thermocompression bonding time is 12-18S.

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