A multi-color spliced film and a method for manufacturing the same

Abstract

The present application relates to the technical field of splicing film, and particularly discloses a multi-color splicing film, which comprises a polyurethane outer film layer and a modified base film layer, wherein the modified base film layer is impregnated with a modified coordination compound liquid and then formed into the multi-color splicing film through a double-layer co-extrusion casting machine. The multi-color splicing film is improved in raw materials and process through the modified base film layer, and then impregnated with the modified coordination compound liquid. Finally, the multi-color splicing film is formed through the double-layer co-extrusion casting machine. The product has excellent elongation at break, excellent heat resistance, and excellent acid corrosion resistance.

Description

Technical Field

[0001] This invention relates to the field of splicing film technology, specifically to a multi-color splicing film and its preparation method. Background Technology

[0002] A film is a thin, soft, transparent sheet made of plastics, adhesives, rubber, or other materials. Scientifically, a film is defined as a two-dimensional material formed by the deposition of atoms, molecules, or ions on a substrate surface. Film manufacturing methods include flatbed film and blown film. In the production of plastic products, plastic granules are melted using an extruder, and then the molten material is heated to the optimal temperature required for blown film production using a blown film device. The molten material overflows uniformly from an annular interlayer, and then the molten material is blown into a plastic film using air blown uniformly from inside the annular interlayer.

[0003] Existing films use multiple color groups in the outer polyurethane film layer to create a multi-color effect, thereby optimizing the diversity of the film and expanding its application range. However, these films have poor heat resistance, are prone to shrinkage, affecting their performance, and have poor elongation at break, further reducing their efficiency. Existing technologies make it difficult to coordinate and improve the heat resistance and elongation at break of the film, thus limiting the product's efficiency. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the purpose of this invention is to provide a multi-color spliced ​​film and its preparation method to solve the problems mentioned in the background art.

[0005] The present invention solves the technical problem by adopting the following technical solution:

[0006] This invention provides a multi-color splicing film, which includes a polyurethane outer film layer and a modified base film layer. The modified base film layer is impregnated with a modified co-component solution and then co-extruded in a casting machine to obtain the multi-color splicing film.

[0007] The specific steps for impregnating the modified base film layer with the modified synergistic compound solution are as follows:

[0008] Step 1: Preparation of the coordinating modified additive;

[0009] Step 2: Add 5-10 parts of the coordinating modifier to 10-15 parts of the chitosan aqueous solution, stir for one stage, then add 1-4 parts of citric acid aqueous solution and 0.25-0.35 parts of yttrium nitrate, stir for two stages, and finally add 0.1-0.4 parts of organic alcohol amine, stir for three stages. After stirring is completed, the modified coordinating compound solution is obtained.

[0010] Step 3: The modified base film is placed in the modified coordinating compound solution for high-pressure impregnation treatment. The impregnation pressure is 10-15 MPa and the impregnation time is 30-40 min. After impregnation, the film is washed with water and dried.

[0011] The modified base film comprises the following raw materials in parts by weight: 75-85 parts of low-density polyethylene resin, 3-5 parts of polyethylene wax, 1-3 parts of stearic acid, and 2-5 parts of maleic anhydride compatibilizer.

[0012] Preferably, the polyurethane outer film layer is spliced ​​together from a first color group and a second color group. The first color group and the second color group include 2-3 color areas, which are respectively one of matte color area, reflective color area and fluorescent color area. Both the first color group and the second color group are made of polyurethane material.

[0013] Preferably, the modified base film further includes 4-8 parts by weight of glass fiber-modified aluminum-magnesium hydrotalcite modifier;

[0014] The specific preparation method of the glass fiber-modified aluminum-magnesium hydrotalcite modifier is as follows:

[0015] S11: Mix silane coupling agent KH560, isopropanol, and water in a weight ratio of 1:1:2 and carry out hydrolysis reaction for 35-45 minutes. The pH of the hydrolysate is 7.5-8.0 to obtain silane coupling agent hydrolysate.

[0016] S12: Aluminum-magnesium hydrotalcite was added to the silane coupling agent hydrolysate at a weight ratio of 1:5 and stirred to disperse evenly to obtain an aluminum-magnesium hydrotalcite modified solution.

[0017] S13: Add glass fiber to aluminum-magnesium hydrotalcite modification liquid at a weight ratio of 1:5 and stir thoroughly to obtain glass fiber compound aluminum-magnesium hydrotalcite agent.

[0018] S14: Then, add the glass fiber compound aluminum-magnesium hydrotalcite agent to a compound synergistic liquid with a total volume of 2-3 times the glass fiber compound aluminum-magnesium hydrotalcite agent and ultrasonically disperse it thoroughly. The ultrasonic power is 450-550W and the ultrasonic time is 20-30min. After ultrasonication, wash with water and dry to obtain the glass fiber compound aluminum-magnesium hydrotalcite modifier.

[0019] Preferably, the compound synergistic solution comprises the following raw materials in parts by weight:

[0020] 1-3 parts glucuronide, 5-10 parts ethanol solvent, 2-4 parts cetyltrimethylammonium bromide, 0.2-0.5 parts glycolic acid, and 0.25-0.45 parts phosphate buffer solution with a pH of 4.5.

[0021] Preferably, the chitosan aqueous solution has a mass fraction of 5-8%; the citric acid aqueous solution has a mass fraction of 8-10%; and the yttrium nitrate concentration is 0.01-0.02 mol / L.

[0022] Preferably, the primary stirring speed is 300-400 r / min and the stirring time is 25-35 min; the secondary stirring speed is 800-1200 r / min and the stirring time is 10-20 min; and the tertiary stirring speed is 150-200 r / min and the stirring time is 45-55 min.

[0023] Preferably, the method for preparing the synergistic modifier is as follows:

[0024] S101: Heat the bentonite at 310-320℃ for 15-25 minutes, then cool it to 40-45℃ at a rate of 1-3℃ / min and keep it at that temperature.

[0025] S102: Then add it to 3-5 times the mass fraction of 5% sodium alginate aqueous solution, stir to disperse evenly, wash with water and dry;

[0026] S103: Add 10-15% of the total amount of SO2 product to the SO2 product and ball milling modification treatment. After ball milling, wash with water and dry to obtain the coordinated modification additive. The ball milling solution is prepared by 5-10 parts of carboxymethyl cellulose, 10-20 parts of deionized water and 2-4 parts of 5% hydrochloric acid aqueous solution.

[0027] Preferably, the ball milling speed for ball milling modification is 1000-1500 r / min, and the ball milling time is 20-30 min.

[0028] Preferably, in the co-extrusion molding process of the casting machine, the film thickness ratio of the polyurethane outer film layer and the modified base film is 1:2, the co-extrusion die temperature is 230-240℃, the casting stretch ratio is 1.1-1.2, and the cooling and setting temperature is 30-35℃.

[0029] This invention also provides a method for preparing a multi-color spliced ​​film, comprising the following steps:

[0030] Step 1: Pour low-density polyethylene resin, polyethylene wax, stearic acid, maleic anhydride compatibilizer and glass fiber compound aluminum magnesium hydrotalcite modifier into a mixer and stir until the raw materials are evenly mixed.

[0031] Step 2: Then feed it into a twin-screw granulator for granulation at a temperature of 170-175℃. After that, feed it into a blown film machine for blowing at a temperature of 175-185℃. After blowing, cool and set to obtain the modified base film.

[0032] Step 3: The modified base layer membrane is then immersed in the modified coordinating compound solution for immersion treatment. After treatment, it is washed with water and dried.

[0033] Step 4: Finally, a casting machine is used to co-extrude the polyurethane outer film layer and the modified base film to obtain the multi-color spliced ​​film of the present invention.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] This invention relates to a multi-color spliced ​​film. Multiple color groups are spliced ​​together in a polyurethane outer film layer to create a multi-color effect, optimizing the film's diversity. The raw materials and processes are optimized through a modified base film layer, combined with impregnation treatment using a modified co-component solution. Finally, the multi-color spliced ​​film is formed by double-layer co-extrusion in a casting machine. The product exhibits excellent elongation at break and superior heat resistance, with both properties synergistically improved. Simultaneously, the product demonstrates excellent acid corrosion resistance. The glass fiber-modified aluminum-magnesium hydrotalcite modifier in the modified base film layer optimizes the interfacial properties of the aluminum-magnesium hydrotalcite through surface modification with a coupling agent hydrolysate. The introduction of glass fiber provides reinforcement and coordination. Both are then treated with a synergistic compound solution. The glucuronide in the synergistic compound solution has multiple active groups, while hexadecyltrimethylammonium bromide, glycolic acid, and phosphate buffer solution work synergistically to optimize the raw materials. The resulting glass fiber-modified aluminum-magnesium hydrotalcite modifier enhances the elongation at break of the film matrix. It also improves heat resistance. Through impregnation treatment with the modified coordinating compound solution, it can synergistically work with the glass fiber-modified aluminum-magnesium hydrotalcite modifier in the modified base film layer, complementing each other and improving the product's performance. The coordinating modifier uses bentonite that has undergone heat treatment to increase the interlayer spacing, and then disperses it in sodium alginate aqueous solution to improve the interlayer dispersion. It is then ball-milled with carboxymethyl cellulose, deionized water, and 5% hydrochloric acid aqueous solution. The ball-milled coordinating modifier has better dispersion and stronger activity in the modified coordinating compound solution. The coordinating modifier is permeable to chitosan aqueous solution and can be mutually compatibilized. By combining it with citric acid aqueous solution and yttrium nitrate, the interfacial activity between raw materials is enhanced. The addition of organic alcohol amines further promotes the bonding force between the coordinating modifier and the modified base film layer, thereby optimizing the impregnation effect of the modified coordinating compound solution. This further synergizes with the raw materials of the glass fiber-modified aluminum-magnesium hydrotalcite modifier in the modified base film layer, resulting in a significant optimization of the product's performance. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] This embodiment provides a multi-color splicing film, which includes a polyurethane outer film layer and a modified base film layer. The modified base film layer is impregnated with a modified co-component liquid and then co-extruded in a casting machine to obtain the multi-color splicing film.

[0038] The specific steps for impregnating the modified base film layer with the modified synergistic compound solution are as follows:

[0039] Step 1: Preparation of the coordinating modified additive;

[0040] Step 2: Add 5-10 parts of the coordinating modifier to 10-15 parts of the chitosan aqueous solution, stir for one stage, then add 1-4 parts of citric acid aqueous solution and 0.25-0.35 parts of yttrium nitrate, stir for two stages, and finally add 0.1-0.4 parts of organic alcohol amine, stir for three stages. After stirring is completed, the modified coordinating compound solution is obtained.

[0041] Step 3: The modified base film is placed in the modified coordinating compound solution for high-pressure impregnation treatment. The impregnation pressure is 10-15 MPa and the impregnation time is 30-40 min. After impregnation, the film is washed with water and dried.

[0042] The modified base film comprises the following raw materials in parts by weight: 75-85 parts of low-density polyethylene resin, 3-5 parts of polyethylene wax, 1-3 parts of stearic acid, and 2-5 parts of maleic anhydride compatibilizer.

[0043] In this embodiment, the polyurethane outer film layer is composed of a first color group and a second color group. The first color group and the second color group include 2-3 color areas, which are respectively one of the matte color area, reflective color area, and fluorescent color area. Both the first color group and the second color group are made of polyurethane material.

[0044] The modified base film of this embodiment also includes 4-8 parts by weight of glass fiber-modified aluminum-magnesium hydrotalcite modifier;

[0045] The specific preparation method of the glass fiber-modified aluminum-magnesium hydrotalcite modifier is as follows:

[0046] S11: Mix silane coupling agent KH560, isopropanol, and water in a weight ratio of 1:1:2 and carry out hydrolysis reaction for 35-45 minutes. The pH of the hydrolysate is 7.5-8.0 to obtain silane coupling agent hydrolysate.

[0047] S12: Aluminum-magnesium hydrotalcite was added to the silane coupling agent hydrolysate at a weight ratio of 1:5 and stirred to disperse evenly to obtain an aluminum-magnesium hydrotalcite modified solution.

[0048] S13: Add glass fiber to aluminum-magnesium hydrotalcite modification liquid at a weight ratio of 1:5 and stir thoroughly to obtain glass fiber compound aluminum-magnesium hydrotalcite agent.

[0049] S14: Then, add the glass fiber compound aluminum-magnesium hydrotalcite agent to a compound synergistic liquid with a total volume of 2-3 times the glass fiber compound aluminum-magnesium hydrotalcite agent and ultrasonically disperse it thoroughly. The ultrasonic power is 450-550W and the ultrasonic time is 20-30min. After ultrasonication, wash with water and dry to obtain the glass fiber compound aluminum-magnesium hydrotalcite modifier.

[0050] The compound synergistic solution of this embodiment includes the following raw materials in parts by weight:

[0051] 1-3 parts glucuronide, 5-10 parts ethanol solvent, 2-4 parts cetyltrimethylammonium bromide, 0.2-0.5 parts glycolic acid, and 0.25-0.45 parts phosphate buffer solution with a pH of 4.5.

[0052] In this embodiment, the chitosan aqueous solution has a mass fraction of 5-8%; the citric acid aqueous solution has a mass fraction of 8-10%; and the yttrium nitrate concentration is 0.01-0.02 mol / L.

[0053] In this embodiment, the primary stirring speed is 300-400 r / min, and the stirring time is 25-35 min; the secondary stirring speed is 800-1200 r / min, and the stirring time is 10-20 min; the tertiary stirring speed is 150-200 r / min, and the stirring time is 45-55 min.

[0054] The preparation method of the harmonizing modified additive in this embodiment is as follows:

[0055] S101: Heat the bentonite at 310-320℃ for 15-25 minutes, then cool it to 40-45℃ at a rate of 1-3℃ / min and keep it at that temperature.

[0056] S102: Then add it to 3-5 times the mass fraction of 5% sodium alginate aqueous solution, stir to disperse evenly, wash with water and dry;

[0057] S103: Add 10-15% of the total amount of SO2 product to the SO2 product and ball milling modification treatment. After ball milling, wash with water and dry to obtain the coordinated modification additive. The ball milling solution is prepared by 5-10 parts of carboxymethyl cellulose, 10-20 parts of deionized water and 2-4 parts of 5% hydrochloric acid aqueous solution.

[0058] In this embodiment, the ball milling speed for ball milling modification is 1000-1500 r / min, and the ball milling time is 20-30 min.

[0059] In this embodiment, the thickness ratio of the polyurethane outer film layer to the modified base film in the co-extrusion molding process is 1:2, the temperature of the co-extrusion die is 230-240℃, the casting stretch ratio is 1.1-1.2, and the cooling and setting temperature is 30-35℃.

[0060] The method for preparing a multi-color spliced ​​film according to this embodiment includes the following steps:

[0061] Step 1: Pour low-density polyethylene resin, polyethylene wax, stearic acid, maleic anhydride compatibilizer and glass fiber compound aluminum magnesium hydrotalcite modifier into a mixer and stir until the raw materials are evenly mixed.

[0062] Step 2: Then feed it into a twin-screw granulator for granulation at a temperature of 170-175℃. After that, feed it into a blown film machine for blowing at a temperature of 175-185℃. After blowing, cool and set to obtain the modified base film.

[0063] Step 3: The modified base layer membrane is then immersed in the modified coordinating compound solution for immersion treatment. After treatment, it is washed with water and dried.

[0064] Step 4: Finally, a casting machine is used to co-extrude the polyurethane outer film layer and the modified base film to obtain the multi-color spliced ​​film of the present invention.

[0065] Example 1.

[0066] This embodiment provides a multi-color splicing film, which includes a polyurethane outer film layer and a modified base film layer. The modified base film layer is impregnated with a modified co-component liquid and then co-extruded in a casting machine to obtain the multi-color splicing film.

[0067] The specific steps for impregnating the modified base film layer with the modified synergistic compound solution are as follows:

[0068] Step 1: Preparation of the coordinating modified additive;

[0069] Step 2: Add 5 parts of the coordinating modifier to 10 parts of the chitosan aqueous solution, stir for one stage, then add 1 part of citric acid aqueous solution and 0.25 parts of yttrium nitrate, stir for two stages, and finally add 0.1 parts of organic alcohol amine, stir for three stages. After stirring is completed, the modified coordinating compound solution is obtained.

[0070] Step 3: The modified base film is placed in the modified coordinating compound solution for high-pressure impregnation treatment. The impregnation pressure is 10 MPa and the impregnation time is 30 min. After impregnation, the film is washed with water and dried.

[0071] The modified base film comprises the following raw materials in parts by weight: 75 parts low-density polyethylene resin, 3 parts polyethylene wax, 1 part stearic acid, and 2 parts maleic anhydride compatibilizer.

[0072] In this embodiment, the polyurethane outer film layer is spliced ​​together from a first color group and a second color group. The first color group and the second color group include two color areas. The color areas of the first color group are a matte color area and a reflective color area, and the color areas of the second color group are a reflective color area and a fluorescent color area. Both the first color group and the second color group are made of polyurethane material.

[0073] The modified base film of this embodiment also includes 4 parts by weight of glass fiber-modified aluminum-magnesium hydrotalcite modifier;

[0074] The specific preparation method of the glass fiber-modified aluminum-magnesium hydrotalcite modifier is as follows:

[0075] S11: Mix silane coupling agent KH560, isopropanol, and water in a weight ratio of 1:1:2 and carry out hydrolysis reaction for 35 minutes. The pH of the hydrolysate is 7.5, and the silane coupling agent hydrolysate is obtained.

[0076] S12: Aluminum-magnesium hydrotalcite was added to the silane coupling agent hydrolysate at a weight ratio of 1:5 and stirred to disperse evenly to obtain an aluminum-magnesium hydrotalcite modified solution.

[0077] S13: Add glass fiber to aluminum-magnesium hydrotalcite modification liquid at a weight ratio of 1:5 and stir thoroughly to obtain glass fiber compound aluminum-magnesium hydrotalcite agent.

[0078] S14: Then, the glass fiber compound aluminum-magnesium hydrotalcite agent is added to a compound synergistic liquid with a total volume of 2 times that of the glass fiber compound aluminum-magnesium hydrotalcite agent and ultrasonically dispersed until fully dispersed. The ultrasonic power is 450W and the ultrasonic time is 20min. After ultrasonication, the mixture is washed with water and dried to obtain the glass fiber compound aluminum-magnesium hydrotalcite modifier.

[0079] The compound synergistic solution of this embodiment includes the following raw materials in parts by weight:

[0080] 1 part glucuronide, 5 parts ethanol solvent, 2 parts hexadecyltrimethylammonium bromide, 0.2 parts glycolic acid, and 0.25 parts phosphate buffer solution with a pH of 4.5.

[0081] In this embodiment, the chitosan aqueous solution has a mass fraction of 5%; the citric acid aqueous solution has a mass fraction of 8%; and the yttrium nitrate concentration is 0.01 mol / L.

[0082] In this embodiment, the primary stirring speed is 300 r / min and the stirring time is 25 min; the secondary stirring speed is 800 r / min and the stirring time is 10 min; and the tertiary stirring speed is 150 r / min and the stirring time is 45 min.

[0083] The preparation method of the harmonizing modified additive in this embodiment is as follows:

[0084] S101: The bentonite is heat-treated at 310℃ for 15 minutes, then cooled to 40℃ at a rate of 1℃ / min and held at that temperature.

[0085] S102: Then add it to 3 times the mass fraction of 5% sodium alginate aqueous solution, stir and disperse evenly, wash with water and dry;

[0086] S103: Add 10% of the total amount of SO2 product to the SO2 product in ball milling slurry, ball milling modification treatment, after ball milling, washing with water and drying, the coordinated modification additive can be obtained; the ball milling slurry is prepared by 5 parts carboxymethyl cellulose, 10 parts deionized water and 2 parts of 5% hydrochloric acid aqueous solution.

[0087] In this embodiment, the ball milling speed for ball milling modification is 1000 r / min, and the ball milling time is 20 min.

[0088] In this embodiment, the thickness ratio of the polyurethane outer film layer to the modified base film in the co-extrusion molding process is 1:2, the temperature of the co-extrusion die is 230°C, the casting stretch ratio is 1.1, and the cooling and setting temperature is 30°C.

[0089] The method for preparing a multi-color spliced ​​film according to this embodiment includes the following steps:

[0090] Step 1: Pour low-density polyethylene resin, polyethylene wax, stearic acid, maleic anhydride compatibilizer and glass fiber compound aluminum magnesium hydrotalcite modifier into a mixer and stir until the raw materials are evenly mixed.

[0091] Step 2: Then it is fed into a twin-screw granulator for granulation at a temperature of 170°C. After that, it is fed into a blown film machine for blowing at a temperature of 175°C. After blowing, it is cooled and shaped to obtain the modified base film.

[0092] Step 3: The modified base layer membrane is then immersed in the modified coordinating compound solution for immersion treatment. After treatment, it is washed with water and dried.

[0093] Step 4: Finally, a casting machine is used to co-extrude the polyurethane outer film layer and the modified base film to obtain the multi-color spliced ​​film of the present invention.

[0094] Example 2.

[0095] This embodiment provides a multi-color splicing film, which includes a polyurethane outer film layer and a modified base film layer. The modified base film layer is impregnated with a modified co-component liquid and then co-extruded in a casting machine to obtain the multi-color splicing film.

[0096] The specific steps for impregnating the modified base film layer with the modified synergistic compound solution are as follows:

[0097] Step 1: Preparation of the coordinating modified additive;

[0098] Step 2: Add 10 parts of the coordinating modifier to 15 parts of the chitosan aqueous solution, stir for one stage, then add 4 parts of citric acid aqueous solution and 0.35 parts of yttrium nitrate, stir for two stages, and finally add 0.4 parts of organic alcohol amine, stir for three stages. After stirring is completed, the modified coordinating compound solution is obtained.

[0099] Step 3: The modified base film is placed in the modified coordinating compound solution for high-pressure impregnation treatment. The impregnation pressure is 15MPa and the impregnation time is 40min. After impregnation, the film is washed with water and dried.

[0100] The modified base film comprises the following raw materials in parts by weight: 85 parts low-density polyethylene resin, 5 parts polyethylene wax, 3 parts stearic acid, and 5 parts maleic anhydride compatibilizer.

[0101] In this embodiment, the polyurethane outer film layer is spliced ​​together from a first color group and a second color group. The first color group and the second color group include three color areas: a matte color area, a reflective color area, and a fluorescent color area, respectively. Both the first color group and the second color group are made of polyurethane material.

[0102] The modified base film of this embodiment also includes 8 parts by weight of glass fiber-modified aluminum-magnesium hydrotalcite modifier;

[0103] The specific preparation method of the glass fiber-modified aluminum-magnesium hydrotalcite modifier is as follows:

[0104] S11: Mix silane coupling agent KH560, isopropanol, and water in a weight ratio of 1:1:2 and carry out hydrolysis reaction for 45 min. The pH of the hydrolysate is 8.0, and the silane coupling agent hydrolysate is obtained.

[0105] S12: Aluminum-magnesium hydrotalcite was added to the silane coupling agent hydrolysate at a weight ratio of 1:5 and stirred to disperse evenly to obtain an aluminum-magnesium hydrotalcite modified solution.

[0106] S13: Add glass fiber to aluminum-magnesium hydrotalcite modification liquid at a weight ratio of 1:5 and stir thoroughly to obtain glass fiber compound aluminum-magnesium hydrotalcite agent.

[0107] S14: Then, the glass fiber compound aluminum-magnesium hydrotalcite agent is added to a compound synergistic liquid with a total volume of 3 times the glass fiber compound aluminum-magnesium hydrotalcite agent and ultrasonically dispersed until fully dispersed. The ultrasonic power is 550W and the ultrasonic time is 30min. After ultrasonication, the mixture is washed with water and dried to obtain the glass fiber compound aluminum-magnesium hydrotalcite modifier.

[0108] The compound synergistic solution of this embodiment includes the following raw materials in parts by weight:

[0109] 3 parts glucuronide, 10 parts ethanol solvent, 4 parts hexadecyltrimethylammonium bromide, 0.5 parts glycolic acid, and 0.45 parts phosphate buffer solution with a pH of 4.5.

[0110] In this embodiment, the chitosan aqueous solution has a mass fraction of 8%; the citric acid aqueous solution has a mass fraction of 10%; and the yttrium nitrate concentration is 0.02 mol / L.

[0111] In this embodiment, the primary stirring speed is 400 r / min and the stirring time is 35 min; the secondary stirring speed is 1200 r / min and the stirring time is 20 min; and the tertiary stirring speed is 200 r / min and the stirring time is 55 min.

[0112] The preparation method of the harmonizing modified additive in this embodiment is as follows:

[0113] S101: The bentonite is heat-treated at 320℃ for 25 minutes, then cooled to 45℃ at a rate of 3℃ / min and held at that temperature.

[0114] S102: Then add it to 5 times the mass fraction of 5% sodium alginate aqueous solution, stir and disperse evenly, wash with water and dry;

[0115] S103: Add 15% of the total amount of SO2 product to the SO2 product in ball milling slurry, ball milling modification treatment, after ball milling, washing with water and drying, the coordinated modification additive can be obtained; the ball milling slurry is prepared by 10 parts of carboxymethyl cellulose, 20 parts of deionized water and 4 parts of 5% hydrochloric acid aqueous solution.

[0116] In this embodiment, the ball milling speed for ball milling modification is 1500 r / min, and the ball milling time is 30 min.

[0117] In this embodiment, the thickness ratio of the polyurethane outer film layer to the modified base film in the co-extrusion molding process is 1:2, the co-extrusion die temperature is 240°C, the casting stretch ratio is 1.2, and the cooling and setting temperature is 35°C.

[0118] The method for preparing a multi-color spliced ​​film according to this embodiment includes the following steps:

[0119] Step 1: Pour low-density polyethylene resin, polyethylene wax, stearic acid, maleic anhydride compatibilizer and glass fiber compound aluminum magnesium hydrotalcite modifier into a mixer and stir until the raw materials are evenly mixed.

[0120] Step 2: Then it is fed into a twin-screw granulator for granulation at a temperature of 175°C. After that, it is fed into a blown film machine for blowing at a temperature of 185°C. After blowing, it is cooled and shaped to obtain the modified base film.

[0121] Step 3: The modified base layer membrane is then immersed in the modified coordinating compound solution for immersion treatment. After treatment, it is washed with water and dried.

[0122] Step 4: Finally, a casting machine is used to co-extrude the polyurethane outer film layer and the modified base film to obtain the multi-color spliced ​​film of the present invention.

[0123] Example 3.

[0124] This embodiment provides a multi-color splicing film, which includes a polyurethane outer film layer and a modified base film layer. The modified base film layer is impregnated with a modified co-component liquid and then co-extruded in a casting machine to obtain the multi-color splicing film.

[0125] The specific steps for impregnating the modified base film layer with the modified synergistic compound solution are as follows:

[0126] Step 1: Preparation of the coordinating modified additive;

[0127] Step 2: Add 7.5 parts of the coordinating modifier to 12.5 parts of the chitosan aqueous solution, stir for one stage, then add 2.5 parts of citric acid aqueous solution and 0.30 parts of yttrium nitrate, stir for two stages, and finally add 0.25 parts of organic alcohol amine, stir for three stages. After stirring is completed, the modified coordinating compound solution is obtained.

[0128] Step 3: The modified base film is placed in the modified coordinating compound solution for high-pressure impregnation treatment. The impregnation pressure is 12.5 MPa and the impregnation time is 35 min. After impregnation, the film is washed with water and dried.

[0129] The modified base film comprises the following raw materials in parts by weight: 80 parts low-density polyethylene resin, 4 parts polyethylene wax, 2 parts stearic acid, and 3.5 parts maleic anhydride compatibilizer.

[0130] In this embodiment, the polyurethane outer film layer is spliced ​​together from a first color group and a second color group. The first color group and the second color group include three color areas: a matte color area, a reflective color area, and a fluorescent color area, respectively. Both the first color group and the second color group are made of polyurethane material.

[0131] The modified base film of this embodiment also includes 6 parts by weight of glass fiber-modified aluminum-magnesium hydrotalcite modifier;

[0132] The specific preparation method of the glass fiber-modified aluminum-magnesium hydrotalcite modifier is as follows:

[0133] S11: Mix silane coupling agent KH560, isopropanol, and water in a weight ratio of 1:1:2 and hydrolyze for 40 minutes. The pH of the hydrolysate is 7.8, thus obtaining the silane coupling agent hydrolysate.

[0134] S12: Aluminum-magnesium hydrotalcite was added to the silane coupling agent hydrolysate at a weight ratio of 1:5 and stirred to disperse evenly to obtain an aluminum-magnesium hydrotalcite modified solution.

[0135] S13: Add glass fiber to aluminum-magnesium hydrotalcite modification liquid at a weight ratio of 1:5 and stir thoroughly to obtain glass fiber compound aluminum-magnesium hydrotalcite agent.

[0136] S14: Then, the glass fiber composite aluminum-magnesium hydrotalcite agent is added to a synergistic liquid with a total volume of 2.5 times that of the glass fiber composite aluminum-magnesium hydrotalcite agent and ultrasonically dispersed until fully dispersed. The ultrasonic power is 500W and the ultrasonic time is 25min. After ultrasonication, the mixture is washed with water and dried to obtain the glass fiber composite aluminum-magnesium hydrotalcite modifier.

[0137] The compound synergistic solution of this embodiment includes the following raw materials in parts by weight:

[0138] 2 parts glucuronide, 7.5 parts ethanol solvent, 3 parts cetyltrimethylammonium bromide, 0.35 parts glycolic acid, and 0.30 parts phosphate buffer solution with a pH of 4.5.

[0139] In this embodiment, the chitosan aqueous solution has a mass fraction of 6.5%; the citric acid aqueous solution has a mass fraction of 9%; and the yttrium nitrate concentration is 0.015 mol / L.

[0140] In this embodiment, the primary stirring speed is 350 r / min and the stirring time is 30 min; the secondary stirring speed is 1000 r / min and the stirring time is 15 min; and the tertiary stirring speed is 180 r / min and the stirring time is 50 min.

[0141] The preparation method of the harmonizing modified additive in this embodiment is as follows:

[0142] S101: The bentonite is heat-treated at 315℃ for 20 minutes, then cooled to 42℃ at a rate of 2℃ / min and held at that temperature.

[0143] S102: Then add it to 4 times the mass fraction of 5% sodium alginate aqueous solution, stir and disperse evenly, wash with water and dry;

[0144] S103: Add 12% of the total amount of SO2 product to the SO2 product in ball milling slurry, ball milling modification treatment, after ball milling, washing with water and drying, the coordinated modification additive can be obtained; the ball milling slurry is prepared by 7.5 parts of carboxymethyl cellulose, 15 parts of deionized water and 3 parts of 5% hydrochloric acid aqueous solution.

[0145] In this embodiment, the ball milling speed for ball milling modification is 1250 r / min, and the ball milling time is 25 min.

[0146] In this embodiment, the thickness ratio of the polyurethane outer film layer to the modified base film in the co-extrusion molding process is 1:2, the co-extrusion die temperature is 235°C, the casting stretch ratio is 1.15, and the cooling and setting temperature is 32.5°C.

[0147] The method for preparing a multi-color spliced ​​film according to this embodiment includes the following steps:

[0148] Step 1: Pour low-density polyethylene resin, polyethylene wax, stearic acid, maleic anhydride compatibilizer and glass fiber compound aluminum magnesium hydrotalcite modifier into a mixer and stir until the raw materials are evenly mixed.

[0149] Step 2: Then it is fed into a twin-screw granulator for granulation at a temperature of 172°C. After that, it is fed into a blown film machine for blowing at a temperature of 180°C. After blowing, it is cooled and shaped to obtain the modified base film.

[0150] Step 3: The modified base layer membrane is then immersed in the modified coordinating compound solution for immersion treatment. After treatment, it is washed with water and dried.

[0151] Step 4: Finally, a casting machine is used to co-extrude the polyurethane outer film layer and the modified base film into a double-layer shape to obtain the multi-color spliced ​​film of the present invention.

[0152] Comparative Example 1.

[0153] Unlike Example 3, the modified base film did not contain glass fiber-modified aluminum-magnesium hydrotalcite modifier.

[0154] Comparative Example 2.

[0155] The preparation method of the glass fiber compound aluminum-magnesium hydrotalcite modifier differs from that of Example 3:

[0156] Glass fiber was added to aluminum-magnesium hydrotalcite at a weight ratio of 1:5 and stirred thoroughly to obtain glass fiber-composite aluminum-magnesium hydrotalcite agent; no coupling agent hydrolysate treatment was used; other conditions remained unchanged.

[0157] Comparative Example 3.

[0158] Unlike Example 3, the preparation of the glass fiber compound aluminum-magnesium hydrotalcite modifier did not use a compound synergistic solution treatment.

[0159] Comparative Example 4.

[0160] Unlike Example 3, in the preparation of the glass fiber-modified aluminum-magnesium hydrotalcite modifier, graphene raw material was used instead of glass fiber.

[0161] Comparative Example 5.

[0162] Unlike Example 3, the modified base film layer was not impregnated with the modified coordinating compound solution.

[0163] Comparative Example 6.

[0164] Unlike Example 3, no coordinating modifiers were added to the modified coordinating compound solution.

[0165] Comparative Example 7.

[0166] Unlike Example 3, the coordinating modifier is replaced with bentonite.

[0167] Comparative Example 8.

[0168] Unlike Example 3, no organic alcohol amines were added to the modified coordinating compound solution.

[0169] Comparative Example 9.

[0170] Unlike Example 3, the chitosan aqueous solution in the modified coordinating compound solution is replaced with deionized water.

[0171] Take a 15cm*15cm membrane material and test its dimensions under normal conditions, denoted as S1. Place the membrane material between a book and an 85℃ constant temperature oven. Start timing after the temperature returns to 85℃. After 35 minutes, remove the membrane material and let it cool to room temperature, then test its dimensions again, denoted as S2. The thermal shrinkage rate of the membrane material is (S1-S2) / S1*100%. The elongation at break is tested using a membrane tensile tester. At the same time, the membrane material is placed under 2% hydrochloric acid mist for 24 hours and its acid resistance is tested.

[0172] The performance measurement results of Examples 1-3 and Comparative Examples 1-9 are as follows:

[0173]

[0174]

[0175] From Examples 1-3 and Comparative Examples 1-9, it can be seen that the heat shrinkage rate of the present invention can be as low as 1.1% under normal conditions and as low as 1.2% under acid corrosion conditions, while the elongation at break (MD) can be as high as 143% under normal conditions and as high as 141% under acid corrosion conditions. The heat shrinkage rate and elongation at break can be improved in a coordinated manner, and the product has excellent acid corrosion stability.

[0176] As can be seen from Comparative Examples 1-4 and Example 3, the modified base film without the addition of glass fiber-modified aluminum-magnesium hydrotalcite modifier showed a significant deterioration in thermal shrinkage and elongation at break, as well as a more significant change in acid corrosion stability. Different preparation methods of glass fiber-modified aluminum-magnesium hydrotalcite modifier and the use of graphene as a raw material to replace glass fiber all showed a trend of deterioration in product performance. Only the glass fiber-modified aluminum-magnesium hydrotalcite modifier prepared by the method of this invention showed the most significant performance effect.

[0177] As can be seen from Comparative Examples 5-9, Comparative Example 1, and Example 3, the performance of the products showed a significant trend of deterioration when the modified base film layer was not impregnated with the modified synergistic compound solution or when glass fiber synergistic aluminum-magnesium hydrotalcite modifier was not added to the modified base film. Only when the method of the present invention is used, with the two synergistic effects, can the performance of the product be most significantly enhanced.

[0178] The performance of the modified and coordinated compound solution deteriorated in all cases: the addition of coordinating modifiers, the use of bentonite as a substitute for coordinating modifiers, the absence of organic alcohol amines in the modified and coordinated compound solution, and the use of deionized water instead of chitosan aqueous solution in the modified and coordinated compound solution. Only the modified and coordinated compound solution prepared by the method of this invention showed the most significant performance improvement.

[0179] The inventors of this invention discovered that the performance of the product changed significantly when the compound synergistic solution was not used in the preparation of the glass fiber compound aluminum magnesium hydrotalcite modifier. Therefore, this invention further explores this issue.

[0180] Experimental Example 1.

[0181] Same as Example 3, except that cetyltrimethylammonium bromide was not added to the compound synergistic solution.

[0182] Experimental Example 2.

[0183] Same as Example 3, except that glycolic acid was not added to the compound synergistic solution.

[0184] Experimental Example 3.

[0185] Same as Example 3, except that glucuronide was not added to the compound synergistic solution.

[0186] Experimental Example 4.

[0187] Same as Example 3, except that a phosphate buffer solution with a pH of 4.5 was not added to the compound synergistic solution.

[0188]

[0189] As can be seen from Experiments 1-4, when no glucuronide was added to the compound synergistic solution, the effect on the product's performance was the greatest among the other factors in the compound synergistic solution, followed by glycolic acid. This indicates that the addition of glucuronide can significantly improve the performance of the compound synergistic solution. At the same time, glycolic acid, hexadecyltrimethylammonium bromide, and phosphate buffer solution have a synergistic effect, jointly optimizing and improving the product's performance. Only the compound synergistic solution prepared by co-compacting glucuronide with glycolic acid, hexadecyltrimethylammonium bromide, and phosphate buffer solution in this invention has the most significant effect on improving the product's performance. Other methods are not as effective as the compound synergistic solution prepared by the method of this invention in improving the product's performance.

[0190] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0191] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-color spliced ​​film, characterized in that, The multi-color spliced ​​film includes a polyurethane outer film layer and a modified base film layer. The modified base film layer is impregnated with a modified co-component liquid and then co-extruded in a casting machine to obtain the multi-color spliced ​​film. The specific steps for impregnating the modified base film layer with the modified synergistic compound solution are as follows: Step 1: Preparation of the coordinating modified additive; Step 2: Add 5-10 parts of the coordinating modifier to 10-15 parts of the chitosan aqueous solution, stir for one stage, then add 1-4 parts of citric acid aqueous solution and 0.25-0.35 parts of yttrium nitrate, stir for two stages, and finally add 0.1-0.4 parts of organic alcohol amine, stir for three stages. After stirring is completed, the modified coordinating compound solution is obtained. Step 3: The modified base film is placed in the modified coordinating compound solution for high-pressure impregnation treatment. The impregnation pressure is 10-15 MPa and the impregnation time is 30-40 min. After impregnation, the film is washed with water and dried. The modified base film comprises the following raw materials in parts by weight: 75-85 parts of low-density polyethylene resin, 3-5 parts of polyethylene wax, 1-3 parts of stearic acid, 2-5 parts of maleic anhydride compatibilizer, and 4-8 parts by weight of glass fiber compound aluminum magnesium hydrotalcite modifier. The specific preparation method of the glass fiber-modified aluminum-magnesium hydrotalcite modifier is as follows: S11: Mix silane coupling agent KH560, isopropanol, and water in a weight ratio of 1:1:2 and carry out hydrolysis reaction for 35-45 minutes. The pH of the hydrolysate is 7.5-8.0 to obtain silane coupling agent hydrolysate. S12: Aluminum-magnesium hydrotalcite was added to the silane coupling agent hydrolysate at a weight ratio of 1:5 and stirred to disperse evenly to obtain an aluminum-magnesium hydrotalcite modified solution. S13: Add glass fiber to aluminum-magnesium hydrotalcite modification liquid at a weight ratio of 1:5 and stir thoroughly to obtain glass fiber compound aluminum-magnesium hydrotalcite agent. S14: Then add the glass fiber compound aluminum-magnesium hydrotalcite agent to a compound synergistic liquid with a total volume of 2-3 times the glass fiber compound aluminum-magnesium hydrotalcite agent and ultrasonically disperse it thoroughly. The ultrasonic power is 450-550W and the ultrasonic time is 20-30min. After ultrasonication, wash with water and dry to obtain the glass fiber compound aluminum-magnesium hydrotalcite modifier. The compound synergistic liquid comprises the following raw materials in parts by weight: 1-3 parts glucuronide, 5-10 parts ethanol solvent, 2-4 parts hexadecyltrimethylammonium bromide, 0.2-0.5 parts glycolic acid, and 0.25-0.45 parts phosphate buffer solution with a pH of 4.5; The preparation method of the synergistic modifier is as follows: S101: Heat the bentonite at 310-320℃ for 15-25 minutes, then cool it to 40-45℃ at a rate of 1-3℃ / min and hold it at that temperature. S102: Then add it to 3-5 times the mass fraction of 5% sodium alginate aqueous solution, stir and disperse evenly, wash with water and dry; S103: Add 10-15% of the total amount of S102 product to the S102 product and ball milling modification treatment. After ball milling, wash with water and dry to obtain the coordinated modification additive. The ball milling solution is prepared by 5-10 parts by weight of carboxymethyl cellulose, 10-20 parts by weight of deionized water and 2-4 parts by weight of 5% hydrochloric acid aqueous solution.

2. The multi-color spliced ​​film according to claim 1, characterized in that, The polyurethane outer film layer is composed of a first color group and a second color group spliced ​​together. The first color group and the second color group include 2-3 color areas, which are respectively one of the matte color area, reflective color area, and fluorescent color area. Both the first color group and the second color group are made of polyurethane material.

3. The multi-color spliced ​​film according to claim 1, characterized in that, The chitosan aqueous solution has a mass fraction of 5-8%; the citric acid aqueous solution has a mass fraction of 8-10%; and the yttrium nitrate concentration is 0.01-0.02 mol / L.

4. The multi-color spliced ​​film according to claim 1, characterized in that, The primary stirring speed is 300-400 r / min, and the stirring time is 25-35 min; the secondary stirring speed is 800-1200 r / min, and the stirring time is 10-20 min; the tertiary stirring speed is 150-200 r / min, and the stirring time is 45-55 min.

5. A multi-color spliced ​​film according to claim 1, characterized in that, The ball milling speed for the ball milling modification is 1000-1500 r / min, and the ball milling time is 20-30 min.

6. The multi-color spliced ​​film according to claim 1, characterized in that, In the co-extrusion molding process of the casting machine, the thickness ratio of the polyurethane outer film layer and the modified base film is 1:2, the temperature of the co-extrusion die is 230-240℃, the casting stretch ratio is 1.1-1.2, and the cooling and setting temperature is 30-35℃.

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