A flame-retardant thin film material with arc-light protection and eye protection function, its preparation method and applications

Abstract

This invention relates to the field of functional polymer materials, and discloses a flame-retardant film material with arc-shielding and eye-protection functions, its preparation method, and its applications. This invention utilizes a multi-layer co-extrusion composite process and a unique formulation of each layer component to form a five-layer composite structure, thereby preparing the flame-retardant film material. The five-layer composite structure includes a blended modified base layer, an arc-shielding and eye-protection layer, and a blended modified flame-retardant layer. This invention enables functional polyvinyl chloride films to leap from a single-function transparent film to a multi-function film, exhibiting excellent performance, simple processing, and low cost, with broad application prospects.

Description

Technical Field

[0001] This invention relates to the field of functional polymer materials, including a flame-retardant thin film material with arc-shielding and eye-protection functions, its preparation method, and its uses. Background Technology

[0002] In a welding workshop, besides the welders who are directly welding and wearing protective face shields, there are other workers present. They may be unable to leave the welding area due to work requirements, but they do not need to be directly exposed to the intense arc light. Therefore, they also need a different but equally effective protective measure to protect their eyes from injury.

[0003] Door curtains are one option. As a common partition and decorative item, door curtains not only block the view and maintain privacy, but also have a certain degree of heat insulation and soundproofing. However, traditional door curtain materials such as fabric and ordinary plastic often have flammability issues, which limits their application.

[0004] To address the specific needs of welding operations, there is an urgent need to develop new types of door curtain materials. These materials must possess arc-shielding and eye-protection functions, while also being flame-retardant; this will not only provide comprehensive eye protection for other workers in the welding workshop but also enhance the overall safety of the workplace to address potential fire risks.

[0005] Chinese Patent Publication No. CN 115991023 A discloses a flame-retardant polypropylene composite film, its preparation method, and its application. The polypropylene composite film comprises at least one film layer A formed of polypropylene composition A, at least one film layer B formed of polypropylene composition B, and at least one film layer C formed of polypropylene composition C; wherein, polypropylene composition A comprises homopolymer polypropylene a, propylene impact copolymer b, and polyolefin elastomer c; polypropylene composition B comprises random polypropylene x and optionally polyolefin elastomer y; and polypropylene composition C comprises polypropylene m and flame retardant n. The composite film of this invention simultaneously possesses good impact resistance, tensile strength, and flame retardant properties, and exhibits good heat-sealing strength at relatively low heat-sealing temperatures. However, the flame-retardant polypropylene composite film provided by this invention lacks functions such as arc light protection and eye protection, and its structure is not a five-layer composite structure; its composition formulation is also significantly different. Summary of the Invention

[0006] In summary, this invention aims to provide a flame-retardant film material with arc-light protection and eye protection functions, its preparation method, and its uses. Through a multi-layer co-extrusion composite process and a unique formulation of each layer, a blended modified base layer, an arc-light protection and eye protection layer, and a blended modified flame-retardant layer are composited to form a five-layer composite structure, thereby preparing a flame-retardant film material with arc-light protection and eye protection functions. The flame-retardant film material is then used to prepare a flame-retardant door curtain with arc-light protection and eye protection functions.

[0007] To achieve the above objectives, this application adopts the following technical solution:

[0008] In a first aspect, this application provides a flame-retardant film material with arc-shielding and eye-protection functions. The film material comprises a five-layer composite structure, including a blended modified base layer, two arc-shielding and eye-protection layers bonded to both sides of the surface of the blended modified base layer, and two blended modified flame-retardant layers bonded to the surface of the arc-shielding and eye-protection layers facing away from the blended modified base layer; the blended modified base layer comprises polyvinyl chloride and polyethylene glycol; the arc-shielding and eye-protection layers comprise polyvinyl chloride, polyvinylpyrrolidone, and an ultraviolet absorber; and the blended modified flame-retardant layers comprise polyvinyl chloride, polyvinyl alcohol, and an ultraviolet absorber.

[0009] Secondly, this application provides a method for preparing a flame-retardant thin film material with arc-shielding and eye-protection functions. The method for preparing the flame-retardant thin film material with arc-shielding and eye-protection functions includes:

[0010] According to the formula, the raw materials of the blended modified base layer, the arc light protection eye protection layer and the blended modified flame retardant layer are respectively mixed in a three-roll mill for 1 hour to obtain the blended modified base layer mixture, the arc light protection eye protection layer mixture and the blended modified flame retardant layer mixture respectively.

[0011] Then, the mixtures of each layer were extruded and granulated in three twin-screw extruders, and under the set temperature control, blended modified base layer granules, arc-proof eye protection layer granules and blended modified flame-retardant layer granules were obtained respectively.

[0012] Finally, a multi-layer co-extrusion composite equipment was used to co-extrude and blow-dry the prepared granules under set parameters. After cooling and molding, a flame-retardant film material with anti-arc light and eye protection functions was obtained.

[0013] Thirdly, this application provides the use of a flame-retardant film material with anti-arc light and eye protection function, which is used to prepare a flame-retardant door curtain with anti-arc light and eye protection function.

[0014] Beneficial technical effects:

[0015] The flame-retardant thin film material with arc-shielding and eye-protection functions obtained in this application comprises a unique five-layer composite structure. This five-layer composite structure includes a blended modified base layer, two arc-shielding and eye-protection layers bonded to both sides of the surface of the blended modified base layer, and two blended modified flame-retardant layers bonded to the surface of the arc-shielding and eye-protection layers facing away from the blended modified base layer. This unique five-layer composite structure ensures that the thin film material has better flame-retardant performance than single-layer or few-layer films.

[0016] In the arc-shielding eye protection layer, both polyvinyl chloride (PVC) and polyvinylpyrrolidone (PVP) are polar polymers. Due to their similar polarities, they have good compatibility. Therefore, UV absorbers and other additives can be well and uniformly dispersed in the arc-shielding eye protection layer, resulting in excellent arc-shielding performance. Furthermore, the pyrrolidone ring in PPVP can absorb UV rays, thus it can work in conjunction with UV absorbers to further enhance the arc-shielding effect.

[0017] In the blended modified flame-retardant layer, polyvinyl chloride and polyvinyl alcohol, due to their similar polarities, also exhibit good compatibility. Therefore, flame retardants, UV absorbers, and other additives can be well and uniformly dispersed within the blended modified flame-retardant layer, thus enhancing its flame-retardant effect. Simultaneously, the UV absorber further imparts a certain degree of arc-shielding performance to the blended modified flame-retardant layer, reducing the intensity of arc light transmitted through it before reaching the arc-shielding eye protection layer.

[0018] Finally, the polyvinylpyrrolidone in the arc-shielding eye protection layer contains a large number of oxygen and nitrogen atoms, which can form a large number of hydrogen bonds with the oxygen atoms in the polyethylene glycol in the blended modified base layer and the oxygen atoms in the polyvinyl alcohol in the blended modified flame-retardant layer, so that the layers of the five-layer composite structure can be more firmly bonded together.

[0019] The flame-retardant thin film material with anti-arc light and eye protection function prepared in this application has excellent performance, simple process, low cost, broad market value and application prospects; and can be used to make flame-retardant door curtains with anti-arc light and eye protection function. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the five-layer structure of a flame-retardant thin film material with anti-arc light and eye protection functions.

[0021] Figure 2 This is a flowchart illustrating the preparation method of a flame-retardant thin film material with arc-shielding and eye-protection functions.

[0022] The meanings of the reference numerals in the figure are as follows:

[0023] 1. Blended modified base layer; 2. Arc light protection eye protection layer; 3. Blended modified flame retardant layer; 4. Ultraviolet absorber. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the application will be further described in detail below with reference to embodiments. However, this should not be construed as limiting the scope of this application to the following examples. All other embodiments obtained by those skilled in the art without creative effort without departing from the above-described methodological spirit of this application are within the scope of protection of this application.

[0025] Figure 1 The positions of the ultraviolet absorbers distributed in the blended modified flame retardant layer in the multilayer structure diagram shown are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the ultraviolet absorbers referred to must have a specific orientation or be distributed in a specific orientation in the blended modified flame retardant layer, and therefore should not be construed as a limitation of this application.

[0026] Furthermore, the terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application.

[0027] The singular forms “for,” “or,” “a,” “any,” and “the” used in this application and the appended claims are intended to include the plural forms unless the context clearly indicates otherwise.

[0028] The terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Firstly, such as Figure 1 As shown, this application provides a flame-retardant film material with arc-light protection and eye protection functions. The film material comprises a five-layer composite structure, which includes a blended modified base layer 1, two arc-light protection and eye-protection layers 2 bonded to both sides of the surface of the blended modified base layer 1, and two blended modified flame-retardant layers 3 bonded to the surface of the arc-light protection and eye-protection layers 2 facing away from the blended modified base layer 1; the blended modified base layer 1 comprises polyvinyl chloride and polyethylene glycol; the arc-light protection and eye-protection layers 2 comprise polyvinyl chloride, polyvinylpyrrolidone, and ultraviolet absorber 4; the blended modified flame-retardant layers 3 comprise polyvinyl chloride, polyvinyl alcohol, and ultraviolet absorber 4.

[0030] Preferably, the mass ratio of polyvinyl chloride, polyethylene glycol, plasticizer, stabilizer and filler in the blended modified base layer 1 is (30~50):(10~20):(10~25):(1~5):(10~30).

[0031] The mass ratio of polyvinyl chloride, polyvinylpyrrolidone, ultraviolet absorber, plasticizer, stabilizer and filler in the arc-proof eye protection layer 2 is (40~50):(10~20):(10~20):(15~20):(1~5):(1~5).

[0032] The mass ratio of polyvinyl chloride, polyvinyl alcohol, plasticizer, flame retardant, stabilizer, filler and ultraviolet absorber in the blended modified flame retardant layer 3 is (30~40):(20~30):(15~35):(5~10):(1~5):(1~5):(5~10).

[0033] Preferably, the plasticizer includes one or more of dioctyl phthalate, dioctyl terephthalate, dibutyl phthalate, dioctyl adipate, tricresyl phosphate, epoxidized soybean oil, and epoxidized linseed oil; wherein the epoxy value of the epoxidized soybean oil and epoxidized linseed oil ranges from 3% to 6%.

[0034] Preferably, the stabilizer includes one or more of dibutyltin dilaurate, octyltin maleate, and calcium-zinc stabilizers.

[0035] Preferably, the filler includes one or more of calcium carbonate, barium sulfate, talc, and kaolin.

[0036] Preferably, the flame retardant includes one or more of aluminum hydroxide, triphenyl phosphate, tricresyl phosphate, and trioctylphosphine oxide.

[0037] Preferably, the ultraviolet absorber includes one or more of nano-titanium dioxide and nano-zinc oxide; the particle size range of the nano-titanium dioxide and nano-zinc oxide is 20~50 nm.

[0038] Compared to existing flame-retardant door curtains, this application uses a multi-layer co-extrusion composite process and the aforementioned unique formulation of each layer to composite a blended modified base layer, a blended modified flame-retardant layer, and an arc-shielding eye protection layer, thereby preparing a flame-retardant film material with a five-layer composite structure and arc-shielding eye protection function.

[0039] Secondly, such as Figure 2 As shown, this application provides a method for preparing a flame-retardant thin film material with arc-shielding and eye-protection functions, comprising:

[0040] According to the formula, the raw materials of the blended modified base layer, the arc light protection eye protection layer and the blended modified flame retardant layer are respectively mixed in a three-roll mill for 1 hour to obtain the blended modified base layer mixture, the arc light protection eye protection layer mixture and the blended modified flame retardant layer mixture respectively.

[0041] Then, the mixtures of each layer were extruded and granulated in three twin-screw extruders, and under the set temperature control, blended modified base layer granules, arc-proof eye protection layer granules and blended modified flame-retardant layer granules were obtained respectively.

[0042] Finally, a multi-layer co-extrusion composite equipment was used to co-extrude and blow-dry the prepared granules under set parameters. After cooling and molding, a flame-retardant film material with anti-arc light and eye protection functions was obtained.

[0043] Preferably, the temperature control during extrusion granulation includes: controlling the temperature of the rear section of the barrel of the three twin-screw extruders at 165~185℃, and controlling the temperature of the front section of the barrel at 180~200℃.

[0044] Preferably, the parameters set during the co-extrusion blown film process include: the co-extrusion die head temperature of the multilayer co-extrusion composite equipment is controlled at 180~200℃; the blow-up ratio is 2.5~3.0; the screw speed is 25~35r / min; and the traction speed is 15~40m / min.

[0045] Thirdly, this application provides the use of a flame-retardant film material with anti-arc light and eye protection function, which is used to prepare a flame-retardant door curtain with anti-arc light and eye protection function.

[0046] The experimental materials used in this invention are sourced from the following sources:

[0047] Polyvinyl chloride: Jiangsu Bost Chemical Technology Co., Ltd.;

[0048] Plasticizer: Guangzhou Yuanda New Materials Co., Ltd.;

[0049] Stabilizer: Jiangsu Bost Chemical Technology Co., Ltd.;

[0050] Filler: Jiangsu Bost Chemical Technology Co., Ltd.;

[0051] Flame retardant: Jiangsu Bost Chemical Technology Co., Ltd.;

[0052] Ultraviolet absorber: Shanghai McLean Biochemical Technology Co., Ltd.

[0053] The following will describe, with reference to different examples, a flame-retardant thin film material with arc-shielding and eye-protection functions provided in this application, its preparation method, and its uses.

[0054] Example 1:

[0055] like Figure 2 As shown, a method for preparing a flame-retardant thin film material with arc-shielding and eye-protection functions is disclosed, the method comprising:

[0056] S1. Weigh the following raw materials respectively, and mix them in a three-roll mill for 1 hour to obtain the blended modified base layer mixture, the arc-proof eye protection layer mixture and the blended modified flame-retardant layer mixture respectively.

[0057] The raw materials for the blended modified base layer are polyvinyl chloride, polyethylene glycol, plasticizer (dioctyl phthalate), stabilizer (dibutyltin dilaurate), and filler (calcium carbonate) in a mass ratio of 42:15:20:3:20.

[0058] The raw materials for the arc-shielding eye protection layer are polyvinyl chloride, polyvinylpyrrolidone, ultraviolet absorber (nano titanium dioxide), plasticizer (tricresyl phosphate), stabilizer (octyltin maleate), and filler (talc) in a mass ratio of 45:15:15:16:4:5.

[0059] The raw materials for the blended modified flame retardant layer are polyvinyl chloride, polyvinyl alcohol, plasticizer (dibutyl phthalate), flame retardant (aluminum hydroxide), stabilizer (octyltin maleate), filler (barium sulfate), and ultraviolet absorber (nano titanium dioxide) in a mass ratio of 40:20:20:10:3:2:5.

[0060] S2. The mixture of each layer prepared in step S1 is extruded and granulated in three twin-screw extruders. The temperature of the rear section of the barrel is controlled at 180℃ and the temperature of the front section of the barrel is controlled at 190℃ to obtain granules of each layer.

[0061] S3. Using a multi-layer co-extrusion composite equipment, the granules prepared in step S2 are used to co-extrude blown film under the conditions of co-extrusion die head temperature controlled at 200℃, blow-up ratio of 2.7, and traction speed of 30r / min. After cooling and molding, a five-layer composite flame-retardant film material with anti-arc light and eye protection function is obtained.

[0062] Example 2:

[0063] like Figure 2 As shown, a method for preparing a flame-retardant thin film material with arc-shielding and eye-protection functions is disclosed, the method comprising:

[0064] S1. Weigh the following raw materials respectively, and mix them in a three-roll mill for 1 hour to obtain the blended modified base layer mixture, the arc-proof eye protection layer mixture and the blended modified flame-retardant layer mixture respectively.

[0065] The raw materials for the blended modified base layer are polyvinyl chloride, polyethylene glycol, plasticizer (dioctyl terephthalate), stabilizer (dibutyltin dilaurate), and filler (barium sulfate) in a mass ratio of 45:20:15:5:15.

[0066] The raw materials for the arc-shielding eye protection layer are polyvinyl chloride, polyvinylpyrrolidone, ultraviolet absorber (nano titanium dioxide), plasticizer (dioctyl adipate), stabilizer (calcium zinc stabilizer), and filler (talc) in a mass ratio of 40:20:16:17:4:3.

[0067] The raw materials for the blended modified flame retardant layer are polyvinyl chloride, polyvinyl alcohol, plasticizer (dibutyl phthalate), flame retardant (aluminum hydroxide), stabilizer (octyltin maleate), filler (barium sulfate), and ultraviolet absorber (nano zinc oxide) in a mass ratio of 35:25:20:8:2:5:5.

[0068] S2. The mixture of each layer prepared in step S1 is extruded and granulated in three twin-screw extruders. The temperature of the rear section of the barrel is controlled at 175℃ and the temperature of the front section of the barrel is controlled at 185℃ to obtain the granules of each layer.

[0069] S3. Using a multi-layer co-extrusion composite equipment, the granules prepared in step S2 are used to co-extrude blown film under the conditions of co-extrusion die head temperature controlled at 190℃, blow ratio of 2.8, and traction speed of 32r / min. After cooling and molding, a five-layer composite flame-retardant film material with anti-arc light and eye protection function is obtained.

[0070] Example 3:

[0071] like Figure 2 As shown, a method for preparing a flame-retardant thin film material with arc-shielding and eye-protection functions is disclosed, the method comprising:

[0072] S1. Weigh the following raw materials respectively, and mix them in a three-roll mill for 1 hour to obtain the blended modified base layer mixture, the arc-proof eye protection layer mixture and the blended modified flame-retardant layer mixture respectively.

[0073] The raw materials for the blended modified base layer are polyvinyl chloride, polyethylene glycol, plasticizer (dibutyl phthalate), stabilizer (dibutyltin dilaurate), and filler (kaolin) in a mass ratio of 40:20:16:4:20.

[0074] The raw materials for the arc-shielding eye protection layer are polyvinyl chloride, polyvinylpyrrolidone, ultraviolet absorber (nano zinc oxide), plasticizer (dioctyl adipate), stabilizer (octyltin maleate), and filler (talc) in a mass ratio of 50:15:15:12:4:4.

[0075] The raw materials for the blended modified flame retardant layer are polyvinyl chloride, polyvinyl alcohol, plasticizer (epoxidized soybean oil, epoxy value 3%), flame retardant (triphenyl phosphate), stabilizer (octyltin maleate), filler (calcium carbonate), and ultraviolet absorber (nano zinc oxide) in a mass ratio of 30:30:18:10:2:5:5.

[0076] S2. The mixture of each layer prepared in step S1 is extruded and granulated in three twin-screw extruders. The temperature of the rear section of the barrel is controlled at 180℃ and the temperature of the front section of the barrel is controlled at 200℃ to obtain granules of each layer.

[0077] S3. Using a multi-layer co-extrusion composite equipment, the granules prepared in step S2 are used to co-extrude blown film under the conditions of co-extrusion die head temperature controlled at 195℃, blow-up ratio of 2.9, and traction speed of 35r / min. After cooling and molding, a five-layer composite flame-retardant film material with anti-arc light and eye protection function is obtained.

[0078] Example 4:

[0079] like Figure 2 As shown, a method for preparing a flame-retardant thin film material with arc-shielding and eye-protection functions is disclosed, the method comprising:

[0080] S1. Weigh the following raw materials respectively, and mix them in a three-roll mill for 1 hour to obtain the blended modified base layer mixture, the arc-proof eye protection layer mixture and the blended modified flame-retardant layer mixture respectively.

[0081] The raw materials for the blended modified base layer are polyvinyl chloride, polyethylene glycol, plasticizer (dioctyl phthalate), stabilizer (dibutyltin dilaurate), and filler (calcium carbonate) in a mass ratio of 35:20:20:3:22.

[0082] The raw materials for the arc-shielding eye protection layer are polyvinyl chloride, polyvinylpyrrolidone, ultraviolet absorber (nano titanium dioxide), plasticizer (tricresyl phosphate), stabilizer (octyltin maleate), and filler (talc) in a mass ratio of 48:12:15:16:4:5.

[0083] The raw materials for the blended modified flame retardant layer are polyvinyl chloride, polyvinyl alcohol, plasticizer (dibutyl phthalate), flame retardant (aluminum hydroxide), stabilizer (octyltin maleate), filler (barium sulfate), and ultraviolet absorber (nano titanium dioxide) in a mass ratio of 35:20:20:8:5:2:10.

[0084] S2. The mixture of each layer prepared in step S1 is extruded and granulated in three twin-screw extruders. The temperature of the rear section of the barrel is controlled at 165℃ and the temperature of the front section of the barrel is controlled at 190℃ to obtain granules of each layer.

[0085] S3. Using a multi-layer co-extrusion composite equipment, the granules prepared in step S2 are used to co-extrude blown film under the conditions of co-extrusion die head temperature controlled at 185℃, blow-up ratio of 2.8, and traction speed of 30r / min. After cooling and molding, a five-layer composite flame-retardant film material with anti-arc light and eye protection function is obtained.

[0086] Example 5:

[0087] like Figure 2 As shown, a method for preparing a flame-retardant thin film material with arc-shielding and eye-protection functions is disclosed, the method comprising:

[0088] S1. Weigh the following raw materials respectively, and mix them in a three-roll mill for 1 hour to obtain the blended modified base layer mixture, the arc-proof eye protection layer mixture and the blended modified flame-retardant layer mixture respectively.

[0089] The raw materials for the blended modified base layer are polyvinyl chloride, polyethylene glycol, plasticizer (dioctyl terephthalate), stabilizer (dibutyltin dilaurate), and filler (barium sulfate) in a mass ratio of 48:20:15:1:16.

[0090] The raw materials for the arc-shielding eye protection layer are polyvinyl chloride, polyvinylpyrrolidone, ultraviolet absorber (nano zinc oxide), plasticizer (dioctyl adipate), stabilizer (octyltin maleate), and filler (talc) in a mass ratio of 42:18:19:16:2:3.

[0091] The raw materials for the blended modified flame retardant layer are polyvinyl chloride, polyvinyl alcohol, plasticizer (epoxidized soybean oil, epoxy value 5%), flame retardant (triphenyl phosphate), stabilizer (octyltin maleate), filler (calcium carbonate), and ultraviolet absorber (nano zinc oxide) in a mass ratio of 30:22:18:10:5:5:10.

[0092] S2. The mixture of each layer prepared in step S1 is extruded and granulated in three twin-screw extruders. The temperature of the rear section of the barrel is controlled at 175℃ and the temperature of the front section of the barrel is controlled at 200℃ to obtain granules of each layer.

[0093] S3. Using a multi-layer co-extrusion composite equipment, the granules prepared in step S2 are used to co-extrude blown film under the conditions of co-extrusion die head temperature controlled at 190℃, blow-up ratio of 2.6, and traction speed of 28r / min. After cooling and molding, a five-layer composite flame-retardant film material with anti-arc light and eye protection function is obtained.

[0094] Example 6:

[0095] like Figure 2 As shown, a method for preparing a flame-retardant thin film material with arc-shielding and eye-protection functions is disclosed, the method comprising:

[0096] S1. Weigh the following raw materials respectively, and mix them in a three-roll mill for 1 hour to obtain the blended modified base layer mixture, the arc-proof eye protection layer mixture and the blended modified flame-retardant layer mixture respectively.

[0097] The raw materials for the blended modified base layer are polyvinyl chloride, polyethylene glycol, plasticizer (tricresyl phosphate), stabilizer (dibutyltin dilaurate), and filler (kaolin) in a mass ratio of 35:15:20:3:27.

[0098] The raw materials for the arc-shielding eye protection layer are polyvinyl chloride, polyvinylpyrrolidone, ultraviolet absorber (nano titanium dioxide), plasticizer (dioctyl adipate), stabilizer (octyltin maleate), and filler (talc) in a mass ratio of 44:14:17:18:4:3.

[0099] The raw materials for the blended modified flame retardant layer are polyvinyl chloride, polyvinyl alcohol, plasticizer (epoxidized soybean oil, epoxy value 6%), flame retardant (aluminum hydroxide), stabilizer (octyltin maleate), filler (barium sulfate), and ultraviolet absorber (nano zinc oxide) in a mass ratio of 30:25:24:9:4:3:5.

[0100] S2. The mixture of each layer prepared in step S1 is extruded and granulated in three twin-screw extruders. The temperature of the rear section of the barrel is controlled at 185℃ and the temperature of the front section of the barrel is controlled at 195℃ to obtain granules of each layer.

[0101] S3. Using a multi-layer co-extrusion composite equipment, the granules prepared in step S2 are co-extruded and blown into a film under the conditions of co-extrusion die head temperature controlled at 200℃, blow ratio of 2.8, and traction speed of 32r / min. After cooling and molding, a five-layer composite flame-retardant film material with anti-arc light and eye protection function is obtained.

[0102] Comparative Example 1:

[0103] A method for preparing a flame-retardant thin film material with arc-shielding and eye-protection functions, the method comprising:

[0104] S1. Weigh the following raw materials separately and mix them in a three-roll mill for 1 hour to obtain a blended modified base layer mixture and an arc-proof eye protection layer mixture, respectively.

[0105] The raw materials for the blended modified base layer are polyvinyl chloride, polyethylene glycol, plasticizer (dioctyl phthalate), stabilizer (dibutyltin dilaurate), and filler (calcium carbonate) in a mass ratio of 42:15:20:3:20.

[0106] The raw materials for the arc-shielding eye protection layer are polyvinyl chloride, polyvinylpyrrolidone, ultraviolet absorber (nano titanium dioxide), plasticizer (tricresyl phosphate), stabilizer (octyltin maleate), and filler (talc) in a mass ratio of 45:15:15:16:4:5.

[0107] S2. The mixture of each layer prepared in step S1 is extruded and granulated in three twin-screw extruders. The temperature of the rear section of the barrel is controlled at 180℃ and the temperature of the front section of the barrel is controlled at 190℃ to obtain granules of each layer.

[0108] S3. Using a multi-layer co-extrusion composite equipment, the granules prepared in step S2 are used to co-extrude blown film under the conditions of co-extrusion die head temperature controlled at 200℃, blow-up ratio of 2.7, and traction speed of 30r / min. After cooling and molding, a flame-retardant film material with anti-arc light and eye protection function is obtained.

[0109] Comparative Example 2:

[0110] A method for preparing a flame-retardant thin film material with arc-shielding and eye-protection functions, the method comprising:

[0111] S1. Weigh the following raw materials separately and mix them in a three-roll mill for 1 hour to obtain a blended modified base layer mixture and a blended modified flame retardant layer mixture, respectively.

[0112] The raw materials for the blended modified base layer are polyvinyl chloride, polyethylene glycol, plasticizer (dioctyl phthalate), stabilizer (dibutyltin dilaurate), and filler (calcium carbonate) in a mass ratio of 42:15:20:3:20.

[0113] The raw materials for the blended modified flame retardant layer are polyvinyl chloride, polyvinyl alcohol, plasticizer (dibutyl phthalate), flame retardant (aluminum hydroxide), stabilizer (octyltin maleate), filler (barium sulfate), and ultraviolet absorber (nano titanium dioxide) in a mass ratio of 40:20:20:10:3:2:5.

[0114] S2. The mixture of each layer prepared in step S1 is extruded and granulated in three twin-screw extruders. The temperature of the rear section of the barrel is controlled at 180℃ and the temperature of the front section of the barrel is controlled at 190℃ to obtain granules of each layer.

[0115] S3. Using a multi-layer co-extrusion composite equipment, the granules prepared in step S2 are used to co-extrude blown film under the conditions of co-extrusion die head temperature controlled at 200℃, blow-up ratio of 2.7, and traction speed of 30r / min. After cooling and molding, a flame-retardant film material with anti-arc light and eye protection function is obtained.

[0116] Comparative Example 3:

[0117] A method for preparing a flame-retardant thin film material with arc-shielding and eye-protection functions, the method comprising:

[0118] S1. Weigh the following raw materials respectively, and mix them in a three-roll mill for 1 hour to obtain the blended modified base layer mixture, the arc-proof eye protection layer mixture and the blended modified flame-retardant layer mixture respectively.

[0119] The raw materials for the blended modified base layer are polyvinyl chloride, plasticizer (dioctyl phthalate), stabilizer (dibutyltin dilaurate), and filler (calcium carbonate) in a mass ratio of 47:20:3:20.

[0120] The raw materials for the arc-shielding eye protection layer are polyvinyl chloride, ultraviolet absorber (nano titanium dioxide), plasticizer (tricresyl phosphate), stabilizer (octyltin maleate), and filler (talc) in a mass ratio of 60:15:16:4:5.

[0121] The raw materials for the blended modified flame retardant layer are polyvinyl chloride, plasticizer (dibutyl phthalate), flame retardant (aluminum hydroxide), stabilizer (octyltin maleate), and filler (barium sulfate) in a mass ratio of 65:20:10:3:2.

[0122] S2. The mixture of each layer prepared in step S1 is extruded and granulated in three twin-screw extruders. The temperature of the rear section of the barrel is controlled at 180℃ and the temperature of the front section of the barrel is controlled at 190℃ to obtain granules of each layer.

[0123] S3. Using a multi-layer co-extrusion composite equipment, the granules prepared in step S2 are used to co-extrude blown film under the conditions of co-extrusion die head temperature controlled at 200℃, blow-up ratio of 2.7, and traction speed of 30r / min. After cooling and molding, a five-layer composite flame-retardant film material with anti-arc light and eye protection function is obtained.

[0124] Refer to GB / T 2410-2008, and use a spectrophotometer method to test the light transmittance of flame-retardant film materials with anti-arc light and eye protection functions.

[0125] The ultraviolet transmittance of flame-retardant film materials with arc-shielding and eye-protection functions was tested using ultraviolet spectrophotometry to evaluate the quality of their arc-shielding and eye-protection functions.

[0126] Referring to GB / T 2408-2021, the combustion performance of flame-retardant film materials with anti-arc light and eye protection functions was tested using a vertical burning test to evaluate their flame-retardant performance.

[0127] Table 1. Performance test results of flame-retardant thin film materials with arc-shielding and eye-protection functions prepared in Examples 1-6 and Comparative Examples 1-4.

[0128]

[0129] As shown in Table 1, the UV transmittance of Examples 1-6 is lower than that of Comparative Examples 1-3. This is because the flame-retardant film material with arc-shielding and eye-protection functions prepared in this application forms a five-layer composite structure by combining the blended modified base layer, the arc-shielding and eye-protection layer, and the blended modified flame-retardant layer through a unique formulation of each layer component and a multi-layer co-extrusion composite process. Moreover, in the arc-shielding and eye-protection layer, polyvinyl chloride and polyvinylpyrrolidone are both polar polymers, and due to their similar polarity, they have good compatibility. Therefore, the UV absorber and other additives can be well and uniformly dispersed in the arc-shielding and eye-protection layer, resulting in a good arc-shielding effect. In addition, the pyrrolidone ring in polyvinylpyrrolidone can absorb UV rays, so it can work with the UV absorber to further enhance the arc-shielding effect. Furthermore, the UV absorber further gives the blended modified flame-retardant layer a certain arc-shielding performance, reducing the intensity of the arc light transmitted through the blended modified flame-retardant layer before reaching the arc-shielding and eye-protection layer.

[0130] The light transmittance of Examples 1-6 is higher than that of Comparative Examples 1-3. This is because the compatibility of polyvinyl chloride after blending and modification with polyvinyl alcohol is greatly enhanced, making the distribution of each component in the entire blended and modified flame retardant layer more uniform than that of polyvinyl chloride used alone. As a result, the entire flame retardant film material can maintain a high level of light transmittance while preventing arcing.

[0131] The flame retardant properties of Examples 1-6 are also better than those of Comparative Examples 1 and 2. This is because the unique five-layer composite structure in Examples 1-6 ensures that the film material has better flame retardant properties than single-layer or few-layer films; while Comparative Example 1 lacks a blended modified flame retardant layer, and Comparative Example 2 lacks an arc-shielding eye protection layer, resulting in an incomplete five-layer composite structure that fails to achieve the designed effect. The flame retardant properties of Comparative Example 3 are only slightly better than those of Comparative Examples 1 and 2, and still inferior to those of Examples 1-6. This is because in Examples 1-6, the polyvinyl chloride and polyvinyl alcohol in the blended modified flame retardant layer also have good compatibility due to their similar polarities. Therefore, the flame retardant, ultraviolet absorber, and other additives can be well and uniformly dispersed in the blended modified flame retardant layer, which improves the flame retardant effect of the blended modified flame retardant layer.

[0132] Finally, the polyvinylpyrrolidone in the arc-shielding eye protection layer contains a large number of oxygen and nitrogen atoms, which can form a large number of hydrogen bonds with the oxygen atoms in the polyethylene glycol in the blended modified base layer and the oxygen atoms in the polyvinyl alcohol in the blended modified flame-retardant layer, so that the layers of the five-layer composite structure can be more firmly bonded together.

[0133] The above results demonstrate and describe the basic principles and main features of the present invention, as well as its advantages.

[0134] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the equivalents of the appended claims.

Claims

1. A flame-retardant thin film material with anti-arc light and eye protection function, characterized in that, The film material comprises a five-layer composite structure, including a blended modified base layer, two arc-shielding eye protection layers bonded to both sides of the surface of the blended modified base layer, and two blended modified flame-retardant layers bonded to the arc-shielding eye protection layers facing away from the surface of the blended modified base layer. The blended modified base layer comprises polyvinyl chloride, polyethylene glycol, dioctyl terephthalate, dibutyltin dilaurate, and barium sulfate. The arc-shielding eye protection layers comprise polyvinyl chloride, polyvinylpyrrolidone, nano zinc oxide, dioctyl adipate, octyltin maleate, and talc. The blended modified flame-retardant layers comprise polyvinyl chloride, polyvinyl alcohol, epoxidized soybean oil with 5% epoxy value, triphenyl phosphate, octyltin maleate, calcium carbonate, and nano zinc oxide. The arc-shielding eye protection layers, the blended modified base layer, and the blended modified flame-retardant layers are enhanced by hydrogen bonding between polyethylene glycol, polyvinylpyrrolidone, and polyvinyl alcohol in each layer. The preparation method of the flame-retardant thin film material with anti-arc light and eye protection function includes: S1. Weigh the following raw materials respectively, and mix them in a three-roll mill for 1 hour to obtain the blended modified base layer mixture, the arc-proof eye protection layer mixture and the blended modified flame-retardant layer mixture respectively. The raw materials for the blended modified base layer are polyvinyl chloride, polyethylene glycol, dioctyl terephthalate, dibutyltin dilaurate, and barium sulfate in a mass ratio of 48:20:15:1:

16. The raw materials for the arc-shielding eye protection layer are polyvinyl chloride, polyvinylpyrrolidone, nano zinc oxide, dioctyl adipate, octyltin maleate, and talc in a mass ratio of 42:18:19:16:2:

3. The raw materials for the blended modified flame retardant layer are polyvinyl chloride, polyvinyl alcohol, epoxidized soybean oil with 5% epoxy value, triphenyl phosphate, octyltin maleate, calcium carbonate, and nano zinc oxide in a mass ratio of 30:22:18:10:5:5:

10. S2. The mixture of each layer prepared in step S1 is extruded and granulated in three twin-screw extruders. The temperature of the rear section of the barrel is controlled at 175℃ and the temperature of the front section of the barrel is controlled at 200℃ to obtain granules of each layer. S3. Using a multi-layer co-extrusion composite equipment, the granules prepared in step S2 are used to co-extrude blown film under the conditions of co-extrusion die head temperature controlled at 190℃, blow-up ratio of 2.6, and traction speed of 28r / min. After cooling and molding, a five-layer composite flame-retardant film material with anti-arc light and eye protection function is obtained.

2. A flame-retardant thin film material with anti-arc light and eye protection function according to claim 1, characterized in that, The particle size range of the nano zinc oxide is 20~50 nm.

3. The use of a flame-retardant thin film material with anti-arc light and eye protection function according to any one of claims 1 to 2, characterized in that, Used to prepare flame-retardant door curtains with anti-arc light and eye protection functions.

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