A high light transmittance PVC film and its preparation method

Abstract

The present invention relates to the technical field of PVC films, and particularly relates to a high-transparency PVC film and a preparation method thereof, comprising the following raw materials in parts by weight: 50-55 parts of PVC resin, 7-11 parts of modified nano-cellulose, 6-8 parts of modified filler, 5-8 parts of silane coupling agent, 4-6 parts of epoxidized soybean oil, 2-3 parts of heat stabilizer, and 2-3 parts of lubricant. The high-transparency PVC film of the present invention is prepared by mixing PVC resin, silane coupling agent, epoxidized soybean oil, heat stabilizer and lubricant, and further reinforcing and adjusting by adding modified nano-cellulose and modified filler, so as to achieve a coordinated balance improvement in the light transmittance performance and mechanical properties of the product, and a remarkable stability effect of the product in terms of temperature resistance and ultraviolet weather resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of PVC films, and particularly relates to a high-transparency PVC film and a preparation method thereof. Background Art

[0002] The natural color of polyvinyl chloride is slightly yellowish translucent, with luster. Its transparency is better than that of polyethylene and polypropylene, but worse than that of polystyrene. Depending on the amount of additives used, it is divided into soft and hard polyvinyl chloride. Soft products are soft and tough, with a sticky feel. The hardness of hard products is higher than that of low-density polyethylene but lower than that of polypropylene, and whitening will occur at the folding point.

[0003] Existing PVC films have poor light transmittance. In order to improve the light transmittance of the products, it is easy to cause poor mechanical properties of the products. The coordinated balance improvement of the two is the technical difficulty of the present invention. At the same time, the products have poor stability in terms of temperature resistance and ultraviolet weather resistance, which limits the use efficiency of the products. Summary of the Invention

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide a high-transparency PVC film and a preparation method thereof to solve the problems put forward in the above background art.

[0005] The present invention solves the technical problems by adopting the following technical solutions:

[0006] The present invention provides a high-transparency PVC film, which comprises the following raw materials in parts by weight:

[0007] 50 - 55 parts of PVC resin, 7 - 11 parts of modified nano-cellulose, 6 - 8 parts of modified filler, 5 - 8 parts of silane coupling agent, 4 - 6 parts of epoxy soybean oil, 2 - 3 parts of heat stabilizer, 2 - 3 parts of lubricant.

[0008] Preferably, it comprises the following raw materials in parts by weight:

[0009] 52.5 parts of PVC resin, 9 parts of modified nano-cellulose, 7 parts of modified filler, 6.5 parts of silane coupling agent, 5 parts of epoxy soybean oil, 2.5 parts of heat stabilizer, 2.5 parts of lubricant.

[0010] Preferably, the silane coupling agent is silane coupling agent KH560; the heat stabilizer is barium-zinc heat stabilizer; the lubricant is sodium stearate.

[0011] Preferably, the preparation method of the modified nano-cellulose is as follows:

[0012] S01: Prepare the modification liquid:

[0013] S011: immerse nano zinc oxide and hydroxyapatite in yttrium nitrate solution and stir evenly, then filter and dry, and then heat calcine at 175-185°C for 1 hour. After calcination, cool naturally to room temperature to obtain nano zinc oxide agent;

[0014] S012: Add 5-8% of alginate to a 4% chitosan solution, and then add 8% sodium citrate solution which is 2-3 times the total mass of the chitosan solution, and stir evenly to obtain a modified sodium citrate solution;

[0015] S013: Add 4 to 7 parts of nano zinc oxide and 1 to 3 parts of silane coupling agent KH550 to 5 to 8 parts of modified sodium citrate solution by weight, stir well, and obtain a modified solution;

[0016] S02: adding nanocellulose to a sufficient amount of modification liquid for ultrasonic modification treatment, and after the modification is completed, filtering and drying are performed to obtain modified nanocellulose.

[0017] Preferably, the mass ratio of the nano zinc oxide, hydroxyapatite and yttrium nitrate solution is (3-4):2:(5-7); wherein the mass fraction of the yttrium nitrate solution is 2-5%.

[0018] Preferably, the ultrasonic modification treatment time is 35-45 min, the ultrasonic power is 400-450 W; and the nanocellulose is lignin nanocellulose.

[0019] Preferably, the preparation method of the modified filler is:

[0020] S01: Prepare a sodium silicate solution with a mass fraction of 4-7%, then add 1-3 parts of stearic acid, 1-2 parts of sodium dodecyl sulfate and 2-3 parts of nano-alumina agent to 5-8 parts of the sodium silicate solution with a mass fraction of 4-7%, and stir evenly to obtain a modified sodium silicate solution;

[0021] S02: Preheat nano titanium dioxide at 60°C for 1 hour to obtain preheated nano titanium dioxide; mix the preheated nano titanium dioxide and modified sodium silicate solution in a weight ratio of 2:5, and ball mill them at a ball milling speed of 1000r / min for 2 hours. After the ball milling is completed, filter and dry to obtain a modified filler.

[0022] Preferably, the preparation method of the nano-alumina agent is: stirring the nano-alumina, dopamine hydrochloride solution and lanthanum oxide according to a weight ratio of 3: (5-7): 1, filtering and drying after the stirring is completed to obtain the nano-alumina agent;

[0023] The mass fraction of the dopamine hydrochloride solution is 3-6%; the stirring speed of the stirring treatment is 450-500 r / min, the stirring is for 1 hour, and the stirring temperature is 60-65°C.

[0024] The present invention also provides a method for preparing a high light-transmission PVC film, comprising the following steps:

[0025] Weigh raw materials according to parts by weight, mix the raw materials evenly to obtain a blend; melt-extrude the blend in an extruder, then blow-mold it, extrude it into a film through a chevron plate and a draw guide roller, and finally cool and wind it up to obtain a high light-transmission PVC film.

[0026] Preferably, the melt extrusion in the extruder is carried out by a twin-screw extruder. The temperature of the first stage is 180 °C, the temperature of the second stage is 200 °C, the temperature of the third stage is 210 °C, the screw speed is 50 r / min, and the length-diameter ratio is 40:1.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The high light-transmission PVC film of the present invention is prepared by mutually blending PVC resin, silane coupling agent, epoxy soybean oil, heat stabilizer and lubricant, and further reinforcing and adjusting by adding modified nano-cellulose and modified filler. Thus, the light-transmission performance and mechanical properties of the product are coordinately and balancedly improved, and the stability effects of the product's temperature resistance and ultraviolet weather resistance are remarkable; the modified nano-cellulose is obtained by treating nano-cellulose with a specific modification liquid of the present invention. The modification liquid is mutually adjusted and optimized by nano-zinc oxide agent, silane coupling agent KH550 and modified sodium citrate solution. In the nano-zinc oxide agent, nano-zinc oxide and hydroxyapatite are immersed in a yttrium nitrate solution for treatment and then calcined and improved. Through the coordination of raw materials, the light transmittance of the system is enhanced. At the same time, the modified sodium citrate solution is prepared by blending raw materials such as chitosan solution and alginic acid, further enhancing the interfacial property between the raw materials of the system. The mutual cooperation between nano-cellulose and the modification liquid is reinforced into the system, enhancing the coordination and stability of the system performance; the modified filler is prepared by preheating nano-titanium dioxide and then blending it with stearic acid, sodium dodecyl sulfate, nano-aluminum oxide agent and sodium silicate solution. Through the mutual cooperation of the raw materials in the modified sodium silicate solution, the nano-titanium dioxide is enhanced to blend with the nano-aluminum oxide agent. Furthermore, the product performance is further improved, and the nano-aluminum oxide agent is prepared by coordinating nano-aluminum oxide, hydrochloric acid dopamine solution and lanthanum oxide, further enhancing the mutual blending effect of the nano-aluminum oxide agent in the system. Thus, the coordination effect between the modified filler and the modified nano-cellulose is enhanced, and the product performance is further improved. Specific embodiments

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. 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.

[0030] A high light-transmittance PVC film of this embodiment includes the following raw materials in parts by weight:

[0031] 50-55 parts of PVC resin, 7-11 parts of modified nanocellulose, 6-8 parts of modified filler, 5-8 parts of silane coupling agent, 4-6 parts of epoxidized soybean oil, 2-3 parts of heat stabilizer, and 2-3 parts of lubricant.

[0032] The silane coupling agent of this embodiment is silane coupling agent KH560; the heat stabilizer is barium zinc heat stabilizer; and the lubricant is sodium stearate.

[0033] The preparation method of the modified nanocellulose of this embodiment is:

[0034] S01: Preparation of modified solution:

[0035] S011: immerse nano zinc oxide and hydroxyapatite in yttrium nitrate solution and stir evenly, then filter and dry, and then heat calcine at 175-185°C for 1 hour. After calcination, cool naturally to room temperature to obtain nano zinc oxide agent;

[0036] S012: Add 5-8% of alginate to a 4% chitosan solution, and then add 8% sodium citrate solution which is 2-3 times the total mass of the chitosan solution, and stir evenly to obtain a modified sodium citrate solution;

[0037] S013: Add 4 to 7 parts of nano zinc oxide and 1 to 3 parts of silane coupling agent KH550 to 5 to 8 parts of modified sodium citrate solution by weight, stir well, and obtain a modified solution;

[0038] S02: adding nanocellulose to a sufficient amount of modification liquid for ultrasonic modification treatment, and after the modification is completed, filtering and drying are performed to obtain modified nanocellulose.

[0039] The mass ratio of nano zinc oxide, hydroxyapatite and yttrium nitrate solution in this embodiment is (3-4):2:(5-7); wherein the mass fraction of yttrium nitrate solution is 2-5%.

[0040] The ultrasonic modification treatment time of this embodiment is 35-45 minutes, and the ultrasonic power is 400-450W; the nanocellulose is lignin nanocellulose.

[0041] The preparation method of the modified filler in this embodiment is as follows:

[0042] S01: Prepare a sodium silicate solution with a mass fraction of 4-7%. Then, according to parts by weight, add 1-3 parts of stearic acid, 1-2 parts of sodium dodecyl sulfate, and 2-3 parts of nano-aluminum oxide agent to 5-8 parts of the sodium silicate solution with a mass fraction of 4-7%, and stir evenly to obtain a modified sodium silicate solution;

[0043] S02: Preheat nano-titanium dioxide at 60°C for 1 h to obtain preheated nano-titanium dioxide; mix the preheated nano-titanium dioxide and the modified sodium silicate solution in a weight ratio of 2:5, perform ball milling treatment, with a ball milling speed of 1000 r / min and ball milling for 2 h. After the ball milling is completed, perform suction filtration and drying to obtain the modified filler.

[0044] The preparation method of the nano-aluminum oxide agent in this embodiment is: stir nano-aluminum oxide, dopamine hydrochloride solution, and lanthanum oxide in a weight ratio of 3:(5-7):1. After stirring is completed, perform suction filtration and drying to obtain the nano-aluminum oxide agent;

[0045] wherein the mass fraction of the dopamine hydrochloride solution is 3-6%; the stirring speed for the stirring treatment is 450-500 r / min, stir for 1 h, and the stirring temperature is 60-65°C.

[0046] The preparation method of a high light transmittance PVC film in this embodiment includes the following steps:

[0047] Weigh the raw materials according to parts by weight, mix the raw materials evenly to obtain a blend; melt and extrude the blend in an extruder, then blow mold, extrude into a film through a chevron plate and a traction guide roller, and finally cool and wind up to obtain a high light transmittance PVC film.

[0048] In the extrusion in the extruder of this embodiment, a twin-screw extruder is used for extrusion. The temperature of the first section is 180°C, the temperature of the second section is 200°C, the temperature of the third section is 210°C, the screw speed is 50 r / min, and the length-diameter ratio is 40:1.

[0049] Example 1: A high light transmittance PVC film, including the following raw materials in parts by weight:

[0050] 50 parts of PVC resin, 7 parts of modified nano-cellulose, 6 parts of modified filler, 5 parts of silane coupling agent, 4 parts of epoxy soybean oil, 2 parts of heat stabilizer, and 2 parts of lubricant.

[0051] The silane coupling agent in this embodiment is silane coupling agent KH560; the heat stabilizer is barium-zinc heat stabilizer; the lubricant is sodium stearate.

[0052] The preparation method of the modified nano-cellulose in this embodiment is:

[0053] S01: Prepare a modified solution:

[0054] S011: immerse nano zinc oxide and hydroxyapatite in yttrium nitrate solution and stir evenly, then filter and dry, and then heat calcine at 175°C for 1 hour. After calcination, cool naturally to room temperature to obtain nano zinc oxide agent;

[0055] S012: adding 5% of alginate to a 4% chitosan solution, and then adding 8% sodium citrate solution twice the total mass of the chitosan solution, and stirring evenly to obtain a modified sodium citrate solution;

[0056] S013: Add 4 parts of nano zinc oxide agent and 1 part of silane coupling agent KH550 to 5 parts of modified sodium citrate solution by weight, stir well, and obtain a modified solution;

[0057] S02: adding nanocellulose to a sufficient amount of modification liquid for ultrasonic modification treatment, and after the modification is completed, filtering and drying are performed to obtain modified nanocellulose.

[0058] The mass ratio of nano zinc oxide, hydroxyapatite and yttrium nitrate solution in this embodiment is 3:2:5, wherein the mass fraction of yttrium nitrate solution is 2%.

[0059] The ultrasonic modification treatment time of this embodiment is 35 minutes, and the ultrasonic power is 400 W; the nanocellulose is lignin nanocellulose.

[0060] The preparation method of the modified filler of this embodiment is:

[0061] S01: Prepare a sodium silicate solution with a mass fraction of 4%, then add 1 part of stearic acid, 1 part of sodium dodecyl sulfate and 2 parts of nano-alumina agent to 5 parts of the sodium silicate solution with a mass fraction of 4% by weight, stir evenly, and obtain a modified sodium silicate solution;

[0062] S02: Preheat nano titanium dioxide at 60°C for 1 hour to obtain preheated nano titanium dioxide; mix the preheated nano titanium dioxide and modified sodium silicate solution in a weight ratio of 2:5, and ball mill them at a ball milling speed of 1000r / min for 2 hours. After the ball milling is completed, filter and dry to obtain a modified filler.

[0063] The preparation method of the nano-alumina agent of this embodiment is as follows: nano-alumina, dopamine hydrochloride solution and lanthanum oxide are stirred in a weight ratio of 3:5:1, and after stirring, the stirring is completed, the nano-alumina agent is filtered and dried to obtain the nano-alumina agent;

[0064] The mass fraction of dopamine hydrochloride solution is 3%; the stirring speed of the stirring treatment is 450 r / min, the stirring time is 1 hour, and the stirring temperature is 60°C.

[0065] A method for preparing a high light-transmittance PVC film of this embodiment comprises the following steps:

[0066] The raw materials are weighed according to weight parts, and the raw materials are mixed uniformly to obtain a blend; the blend is melted and extruded in an extruder, and then blown, extruded into a film through a herringbone plate and a traction guide roller, and finally cooled and rolled to obtain a high-light-transmittance PVC film.

[0067] The melt extrusion in the extruder of this embodiment adopts a twin-screw extruder, the temperature of the first section is 180°C, the temperature of the second section is 200°C, the temperature of the third section is 210°C, the screw speed is 50r / min, and the aspect ratio is 40:1.

[0068] Embodiment 2: A high light transmittance PVC film, comprising the following raw materials in parts by weight:

[0069] 55 parts of PVC resin, 11 parts of modified nanocellulose, 8 parts of modified filler, 8 parts of silane coupling agent, 6 parts of epoxidized soybean oil, 3 parts of heat stabilizer, and 3 parts of lubricant.

[0070] The silane coupling agent of this embodiment is silane coupling agent KH560; the heat stabilizer is barium zinc heat stabilizer; and the lubricant is sodium stearate.

[0071] The preparation method of the modified nanocellulose of this embodiment is:

[0072] S01: Preparation of modified solution:

[0073] S011: immerse nano zinc oxide and hydroxyapatite in yttrium nitrate solution and stir evenly, then filter and dry, and then heat calcine at 185°C for 1 hour. After calcination, cool naturally to room temperature to obtain nano zinc oxide agent;

[0074] S012: adding 8% of alginate to a 4% chitosan solution, and then adding 8% sodium citrate solution which is 3 times the total mass of the chitosan solution, and stirring evenly to obtain a modified sodium citrate solution;

[0075] S013: Add 7 parts of nano zinc oxide agent and 3 parts of silane coupling agent KH550 to 8 parts of modified sodium citrate solution by weight, stir well, and obtain a modified solution;

[0076] S02: adding nanocellulose to a sufficient amount of modification liquid for ultrasonic modification treatment, and after the modification is completed, filtering and drying are performed to obtain modified nanocellulose.

[0077] The mass ratio of nano zinc oxide, hydroxyapatite and yttrium nitrate solution in this embodiment is 4:2:7; wherein the mass fraction of yttrium nitrate solution is 5%.

[0078] The ultrasonic modification treatment time in this embodiment is 45 min, and the ultrasonic power is 450 W; the nanocellulose is lignin nanocellulose.

[0079] The preparation method of the modified filler in this embodiment is as follows:

[0080] S01: Prepare a sodium silicate solution with a mass fraction of 7%, and then add 3 parts of stearic acid, 2 parts of sodium dodecyl sulfate, and 3 parts of nano-aluminum oxide agent by weight to 8 parts of the sodium silicate solution with a mass fraction of 7%, and stir evenly to obtain a modified sodium silicate solution;

[0081] S02: Preheat nano-titanium dioxide at 60 °C for 1 h to obtain preheated nano-titanium dioxide; mix the preheated nano-titanium dioxide and the modified sodium silicate solution in a weight ratio of 2:5, perform ball milling treatment, the ball milling speed is 1000 r / min, ball mill for 2 h, after the ball milling is completed, perform suction filtration and drying to obtain the modified filler.

[0082] The preparation method of the nano-aluminum oxide agent in this embodiment is: stir nano-aluminum oxide, hydrochloric acid dopamine solution, and lanthanum oxide in a weight ratio of 3:7:1, after the stirring is completed, perform suction filtration and drying to obtain the nano-aluminum oxide agent;

[0083] Among them, the mass fraction of the hydrochloric acid dopamine solution is 36%; the stirring speed of the stirring treatment is 500 r / min, stir for 1 h, and the stirring temperature is 65 °C.

[0084] The preparation method of a high light transmittance PVC film in this embodiment includes the following steps:

[0085] Weigh the raw materials by weight, mix the raw materials evenly to obtain a blend; melt and extrude the blend in an extruder, then blow mold, extrude into a film through a chevron plate and a drawing guide roller, and finally cool and wind up to obtain a high light transmittance PVC film.

[0086] In the extruder in this embodiment, the melt extrusion is carried out by a twin-screw extruder, the temperature of the first section is 180 °C, the temperature of the second section is 200 °C, the temperature of the third section is 210 °C, the screw speed is 50 r / min, and the length-diameter ratio is 40:1.

[0087] Example 3: A high light transmittance PVC film, including the following raw materials by weight:

[0088] 52.5 parts of PVC resin, 9 parts of modified nanocellulose, 7 parts of modified filler, 6.5 parts of silane coupling agent, 5 parts of epoxy soybean oil, 2.5 parts of heat stabilizer, 2.5 parts of lubricant.

[0089] The silane coupling agent in this embodiment is silane coupling agent KH560; the heat stabilizer is barium-zinc heat stabilizer; the lubricant is sodium stearate.

[0090] The preparation method of the modified nanocellulose of this embodiment is:

[0091] S01: Preparation of modified solution:

[0092] S011: immerse nano zinc oxide and hydroxyapatite in yttrium nitrate solution and stir evenly, then filter and dry, and then heat calcine at 180°C for 1 hour. After calcination, cool naturally to room temperature to obtain nano zinc oxide agent;

[0093] S012: Add 6.5% of alginate to a 4% chitosan solution, and then add 8% sodium citrate solution which is 2.5 times the total mass of the chitosan solution, and stir evenly to obtain a modified sodium citrate solution;

[0094] S013: Add 5.5 parts of nano zinc oxide agent and 2 parts of silane coupling agent KH550 to 6.5 parts of modified sodium citrate solution by weight, stir well, and obtain a modified solution;

[0095] S02: adding nanocellulose to a sufficient amount of modification liquid for ultrasonic modification treatment, and after the modification is completed, filtering and drying are performed to obtain modified nanocellulose.

[0096] The mass ratio of nano zinc oxide, hydroxyapatite and yttrium nitrate solution in this embodiment is 3.5:2:6, wherein the mass fraction of yttrium nitrate solution is 3.5%.

[0097] The ultrasonic modification treatment time of this embodiment is 40 minutes, the ultrasonic power is 425W; the nanocellulose is lignin nanocellulose.

[0098] The preparation method of the modified filler of this embodiment is:

[0099] S01: Prepare a sodium silicate solution with a mass fraction of 5.5%, then add 2 parts of stearic acid, 1.5 parts of sodium dodecyl sulfate and 2.5 parts of nano-alumina agent to 6.5 parts of the sodium silicate solution with a mass fraction of 5.5%, stir evenly, and obtain a modified sodium silicate solution;

[0100] S02: Preheat nano titanium dioxide at 60°C for 1 hour to obtain preheated nano titanium dioxide; mix the preheated nano titanium dioxide and modified sodium silicate solution in a weight ratio of 2:5, and ball mill them at a ball milling speed of 1000r / min for 2 hours. After the ball milling is completed, filter and dry to obtain a modified filler.

[0101] The preparation method of the nano-alumina agent of this embodiment is as follows: nano-alumina, dopamine hydrochloride solution and lanthanum oxide are stirred in a weight ratio of 3:6:1, and after stirring, the stirring is completed, the nano-alumina agent is filtered and dried to obtain the nano-alumina agent;

[0102] Among them, the mass fraction of the dopamine hydrochloride solution is 4.5%; the stirring speed of the stirring treatment is 475 r / min, stirring for 1 h, and the stirring temperature is 62.5 °C.

[0103] A preparation method of a high light-transmitting PVC film in this embodiment includes the following steps:

[0104] Weigh the raw materials according to parts by weight, mix the raw materials evenly to obtain a blend; melt and extrude the blend in an extruder, then blow mold, extrude into a film through a chevron plate and a drawing guide roller, and finally cool and wind up to obtain a high light-transmitting PVC film.

[0105] In the extruder of this embodiment, the melt extrusion is carried out by a twin-screw extruder. The temperature of the first section is 180 °C, the temperature of the second section is 200 °C, the temperature of the third section is 210 °C, the screw speed is 50 r / min, and the length-diameter ratio is 40:1.

[0106] Comparative Example 1:

[0107] The difference from Example 3 is that modified nanocellulose is not added.

[0108] Comparative Example 2:

[0109] The difference from Example 3 is that the modified liquid treatment is not used in the preparation of modified nanocellulose.

[0110] Comparative Example 3:

[0111] The difference from Example 3 is that nano-zinc oxide agent is not added in the preparation of the modified liquid.

[0112] Comparative Example 4:

[0113] The difference from Example 3 is that in the preparation of the nano-zinc oxide agent, hydroxyapatite is not immersed in the yttrium nitrate solution for treatment, and the nano-zinc oxide agent is directly replaced with nano-zinc oxide raw materials.

[0114] Comparative Example 5:

[0115] The difference from Example 3 is that the modified sodium citrate solution is replaced with a sodium citrate solution with a mass fraction of 8%.

[0116] Comparative Example 6:

[0117] The difference from Example 3 is that the modified filler is not added.

[0118] Comparative Example 7:

[0119] The difference from Example 3 is that preheated nano-titanium dioxide is not added to the modified filler.

[0120] Comparative Example 8:

[0121] The difference from Example 3 is that the modified sodium silicate solution is not added to the modified filler.

[0122] Comparative Example 9:

[0123] Different from Example 3, stearic acid and sodium dodecyl sulfate were not added to the modified sodium silicate solution.

[0124] Comparative Example 10:

[0125] Different from Example 3, the sodium silicate solution in the modified sodium silicate solution was directly replaced by water.

[0126] Comparative Example 11:

[0127] Different from Example 3, nano-aluminum oxide was not added to the modified sodium silicate solution.

[0128] Comparative Example 12:

[0129] Different from Example 3, nano-aluminum oxide was not added during the preparation of the nano-aluminum oxide agent.

[0130] Comparative Example 13:

[0131] Different from Example 3, lanthanum oxide was not added during the preparation of the nano-aluminum oxide agent.

[0132] Comparative Example 14:

[0133] Different from Example 3, the hydrochloric acid dopamine solution was replaced by water during the preparation of the nano-aluminum oxide agent.

[0134] Comparative Example 15:

[0135] Different from Example 3, the mass fraction of the hydrochloric acid dopamine solution was 7% during the preparation of the nano-aluminum oxide agent.

[0136] Conventional test: The light transmittance (tested according to the standard of GB / T2410-2008) and mechanical properties of the products of Examples 1 to 3 and Comparative Examples 1 to 15 were tested, and the test results are shown in Table 1.

[0137] Table 1 Performance test results of the products of Examples 1 to 3 and Comparative Examples 1 to 15 under conventional conditions:

[0138]

[0139] It can be seen from Comparative Examples 1 to 15 and Examples 1 to 3 that the products of Example 3 of the present invention have excellent light transmittance, transverse tensile strength and elongation at break, and the performance of the products can be improved in a coordinated manner;

[0140] It can be seen from Comparative Examples 1 to 15 and Example 3 that when one of the modified nano-cellulose and the modified filler is not added to the product, the performance of the product deteriorates significantly. By using the two in coordination and synergistic effect, the product performance effect is the most obvious;

[0141] During the preparation of modified nanocellulose, no treatment with a modification solution was carried out. During the preparation of the modification solution, no nano-zinc oxide agent was added. During the preparation of the nano-zinc oxide agent, no treatment of immersing hydroxyapatite into yttrium nitrate solution was carried out. The nano-zinc oxide agent was directly replaced with nano-zinc oxide raw materials, and the modified sodium citrate solution was replaced with a 8% (by mass) sodium citrate solution. The performance of the product showed a deteriorating trend. The modified nanocellulose improved with the modification solution obtained by the specific method of the present invention had the most significant product performance effect;

[0142] When no preheated nano-titanium dioxide was added to the modified filler agent and no modified sodium silicate solution was added to the modified filler agent, the performance of the product showed a deteriorating trend. Also, when no stearic acid was added to the modified sodium silicate solution, when sodium dodecyl sulfate was directly replaced with water in the sodium silicate solution, when no nano-aluminum oxide agent was added, when no nano-aluminum oxide was added during the preparation of the nano-aluminum oxide agent, when no lanthanum oxide was added during the preparation of the nano-aluminum oxide agent, when the hydrochloric acid dopamine solution was replaced with water during the preparation of the nano-aluminum oxide agent, and when the mass fraction of the hydrochloric acid dopamine solution was 7% during the preparation of the nano-aluminum oxide agent, the performance of the product showed a deteriorating trend to varying degrees;

[0143] The modified filler agent obtained with the nano-aluminum oxide agent, sodium silicate solution, and specific stearic acid and sodium dodecyl sulfate obtained by the specific method of the present invention had the most obvious product performance effect. Replacing with other methods was not as effective as the present invention;

[0144] The preparation of the nano-aluminum oxide agent was proprietary. Replacing with other raw materials was not as effective as the nano-aluminum oxide agent of the present invention. At the same time, when the mass fraction of the hydrochloric acid dopamine solution was not within the range of the present invention, there was also a certain deteriorating trend. The specific mass fraction of the hydrochloric acid dopamine solution also had a certain improvement trend on the performance of the present invention.

[0145] Further tests were carried out on the present invention, including tests on the stability of heat resistance and ultraviolet weather resistance.

[0146] The products of Examples 1 - 3 and Comparative Examples 1 - 15 were placed at 65 °C for 5 h, then irradiated with ultraviolet light for 1 h, with an irradiation of 300 kwh / m 2 Then placed at -5 °C for 5 h. The above was one cycle, and the cycle was tested 10 times to test the heat resistance and ultraviolet weather resistance stability of the product, that is, to test the light transmittance performance (tested according to the GB / T2410 - 2008 standard) and mechanical properties of the product under high temperature, ultraviolet irradiation, and low temperature conditions. The test results are shown in Table 2:

[0147] Table 2 Performance test results of the products of Examples 1 - 3 and Comparative Examples 1 - 15 under high temperature, ultraviolet irradiation, and low temperature conditions:

[0148]

[0149] It can be seen from Comparative Examples 1 to 15 and Example 3 that when one of the modified nanocellulose and the modified filler is not added to the product, the performance of the product shows an obvious deteriorating trend. Only by using the raw material blending of the present invention and working together synergistically, the performance stability of the product is the most excellent;

[0150] Meanwhile, for the modified nanocellulose and the modified filler prepared by different methods, the performance of the product shows a deteriorating trend. Only by using the raw material formula and process of the present invention, the performance effect of the product is the most remarkable.

[0151] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

[0152] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard 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 high light transmittance PVC film, characterized in that: It includes the following raw materials in parts by weight: 50-55 parts of PVC resin, 7-11 parts of modified nanocellulose, 6-8 parts of modified filler, 5-8 parts of silane coupling agent, 4-6 parts of epoxidized soybean oil, 2-3 parts of heat stabilizer, 2-3 parts of lubricant; The preparation method of the modified nanocellulose is: S01: Preparation of modified solution: S011: immerse nano zinc oxide and hydroxyapatite in yttrium nitrate solution and stir evenly, then filter and dry, and then heat calcine at 175-185°C for 1 hour. After calcination, cool naturally to room temperature to obtain nano zinc oxide agent; S012: Add 5-8% of alginate to a 4% chitosan solution, and then add 8% sodium citrate solution which is 2-3 times the total mass of the chitosan solution, and stir evenly to obtain a modified sodium citrate solution; S013: Add 4 to 7 parts of nano zinc oxide and 1 to 3 parts of silane coupling agent KH550 to 5 to 8 parts of modified sodium citrate solution by weight, stir well, and obtain a modified solution; S02: adding nanocellulose to a sufficient amount of modification liquid for ultrasonic modification, filtering and drying after modification to obtain modified nanocellulose; The preparation method of the modified filler is: S01: Prepare a sodium silicate solution with a mass fraction of 4-7%, then add 1-3 parts of stearic acid, 1-2 parts of sodium dodecyl sulfate and 2-3 parts of nano-alumina agent to 5-8 parts of the sodium silicate solution with a mass fraction of 4-7%, and stir evenly to obtain a modified sodium silicate solution; The preparation method of the nano-alumina agent comprises: stirring the nano-alumina, dopamine hydrochloride solution and lanthanum oxide according to a weight ratio of 3: (5-7): 1, filtering and drying after the stirring is completed, so as to obtain the nano-alumina agent; S02: Preheat nano titanium dioxide at 60°C for 1 hour to obtain preheated nano titanium dioxide; mix the preheated nano titanium dioxide and modified sodium silicate solution in a weight ratio of 2:5, and ball mill them at a ball milling speed of 1000r / min for 2 hours. After the ball milling is completed, filter and dry to obtain a modified filler.

2. A high light transmittance PVC film according to claim 1, characterized in that: It includes the following raw materials in parts by weight: 52.5 parts of PVC resin, 9 parts of modified nanocellulose, 7 parts of modified filler, 6.5 parts of silane coupling agent, 5 parts of epoxidized soybean oil, 2.5 parts of heat stabilizer, and 2.5 parts of lubricant.

3. A high light transmittance PVC film according to claim 1, characterized in that: The silane coupling agent is silane coupling agent KH560; the heat stabilizer is barium zinc heat stabilizer; and the lubricant is sodium stearate.

4. The high light transmittance PVC film according to claim 1, characterized in that: The mass ratio of the nano zinc oxide, hydroxyapatite and yttrium nitrate solution is (3-4):2:(5-7); The mass fraction of yttrium nitrate solution is 2~5%.

5. The high light transmittance PVC film according to claim 1, characterized in that: The ultrasonic modification treatment time is 35-45 minutes, and the ultrasonic power is 400-450W.

6. The high light transmittance PVC film according to claim 1, characterized in that: The nanocellulose is lignin nanocellulose.

7. The high light transmittance PVC film according to claim 1, characterized in that: The mass fraction of the dopamine hydrochloride solution is 3-6%; the stirring speed of the stirring treatment is 450-500 r / min, the stirring time is 1 hour, and the stirring temperature is 60-65° C.

8. A method for preparing a high light transmittance PVC film, for preparing a high light transmittance PVC film as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: The raw materials are weighed according to weight parts, and the raw materials are mixed uniformly to obtain a blend; the blend is melted and extruded in an extruder, and then blown, extruded into a film through a herringbone plate and a traction guide roller, and finally cooled and rolled to obtain a high-light-transmittance PVC film.

9. The method for preparing a high light-transmittance PVC film according to claim 8, characterized in that: The melt extrusion in the extruder adopts a twin-screw extruder, the temperature of the first section is 180°C, the temperature of the second section is 200°C, the temperature of the third section is 210°C, the screw speed is 50r / min, and the aspect ratio is 40:1.

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