Black and white double-layer TPU film for curtain fabric and preparation method of black and white double-layer TPU film

Abstract

The black and white double-layer TPU film for the curtain fabric art comprises a black TPU layer and a white TPU layer, wherein the black TPU layer comprises 100 parts of polyester type thermoplastic polyurethane, 5-30 parts of carbon black, 1-5 parts of a carbon black dispersing agent, 1-10 parts of a slipping agent, 1-15 parts of a matte agent and 1-5 parts of an antioxidant; the white TPU layer comprises 100 parts of polyester type thermoplastic polyurethane, 20-60 parts of titanium dioxide, 1-5 parts of a titanium dioxide pre-dispersing agent, 1-10 parts of a slipping agent, 1-15 parts of a matte agent and 1-5 parts of an antioxidant. The preparation method comprises the following steps: uniformly mixing the black TPU layer raw material and the white TPU layer raw material, and baking for several hours by using 80-130 DEG C dehumidifying hot air; respectively extruding the mixture through a three-layer co-extrusion film blowing machine by using a melt extruder; the cooled film bubbles are rolled and formed, and the TPU film composite PE film is obtained; and carrying out roll separation and stripping, and carrying out traction, stretching and rolling. And the prepared film has white appearance and strong shading property.

Description

Technical Field

[0001] The invention relates to a field, and in particular to a black and white double-layer TPU film for curtain fabrics and a preparation method thereof. Background Art

[0002] In recent years, with the demand for high-quality sleep, curtains as shading home decorations are no longer simple decorations. After the shading property of curtains is improved, the room will become darker, thereby delaying people's waking time, prolonging sleep, and improving sleep quality. In the past, people improved the shading property of fabrics by coating them with black glue. Glue often uses toluene, xylene, N,N-dimethylformamide and dimethyl sulfoxide as organic solvents. Its secondary treatment is cumbersome and highly volatile, which brings environmental pressure. Moreover, after the coating is completed, it needs to enter the baking area for repeated heating and curing, in which the unreacted polymer small molecules in the glue further volatilize, aggravating the pollution of the workshop. The whole process is complicated, the process is cumbersome, and the pollutants are serious, which no longer meets the needs of green development of enterprises. Therefore, the use of high-shading TPU film to bond fabrics has gradually become the mainstream trend of the preparation process of blackout curtains. However, simply bonding the black film to the fabric will make the fabric's own color develop towards the dark color system, affecting its appearance.

[0003] In view of this, the inventor conducted in-depth research on the above-mentioned defects in the prior art, and thus came up with this case. Summary of the invention

[0004] To solve the above technical problems, we proposed a black and white double-layer TPU film for curtain fabrics and its preparation method, which has a white appearance and strong light-shielding properties. The preparation method designs a black and white double-layer composite film, which ensures the covering and makes up for the appearance.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A black and white double-layer TPU film for curtain fabrics comprises a black TPU layer and a white TPU layer, wherein the thickness of the black PU layer and the white TPU layer are both between 0.05 mm and 0.1 mm; the raw materials for preparing the black TPU layer comprise the following components in parts by weight: 100 parts of polyester thermoplastic polyurethane, 5-30 parts of carbon black, 1-5 parts of carbon black dispersant, 1-10 parts of lubricant, 1-15 parts of matte agent, and 1-5 parts of antioxidant; the raw materials for preparing the white TPU layer comprise the following components in parts by weight: 100 parts of polyester thermoplastic polyurethane, 20-60 parts of titanium dioxide, 1-5 parts of titanium dioxide pre-dispersant, 1-10 parts of lubricant, 1-15 parts of matte agent, and 1-5 parts of antioxidant.

[0007] Preferably, the carbon black is pigment carbon black, and its primary particle size is 18-400nm.

[0008] Preferably, the carbon black dispersant is an anionic surfactant, including any one or at least two combinations of dodecyl sulfonic acid, sodium dodecylbenzenesulfonate, lignosulfonate, sodium cellulose, or sodium lauryl polyoxyethylene ether sulfate.

[0009] Preferably, the pre-dispersed titanium dioxide is rutile titanium dioxide or anatase titanium dioxide.

[0010] Preferably, the titanium dioxide pre-dispersant is a cationic surfactant, including any one or at least two combinations of cetyltrimethylammonium bromide, dodecyldimethylbenzylammonium chloride, cetyltrimethylammonium chloride, or didodecyldimethylammonium chloride.

[0011] Preferably, the slip agent is a homogeneous blend of an organic slip agent and an inorganic antiblocking agent, and the organic slip agent is one or at least two combinations of ethylene bisstearamide, ethylene bisoleamide, stearamide, oleamide, erucamide, and polyethylene wax; the inorganic antiblocking agent is one or at least two combinations of diatomaceous earth, talc, barium sulfate, silica, and calcium carbonate.

[0012] Preferably, the matting agent is a homogeneous blend of a matting component and a compatibilizer, and is one or at least two combinations of styrene, acrylonitrile-butadiene-styrene copolymer, acrylonitrile-styrene copolymer, hydrogenated styrene-butadiene block copolymer, styrene-butadiene block copolymer, and is obtained by uniformly dispersing through twin-screw shearing with the compatibilizer.

[0013] Preferably, the compatibilizer is one or at least two combinations of styrene, acrylonitrile-butadiene-styrene copolymer, acrylonitrile-styrene copolymer, and graft-modified copolymers of hydrogenated styrene-butadiene block copolymer.

[0014] Preferably, the graft modification is a graft-modified polymer of glycidyl ester monomer, and the antioxidant is antioxidant 1010, antioxidant 626, or a mixture composed of antioxidant 1010 and antioxidant 626.

[0015] A preparation method of a black-and-white double-layer TPU film for curtain fabrics includes the following steps:

[0016] Step 1: Using a three-layer coextrusion blown film machine, mix 100 parts of polyester thermoplastic polyurethane, 5 - 30 parts of pre-dispersed carbon black, 1 - 10 parts of slip agent, 1 - 15 parts of matting agent, and 1 - 5 parts of antioxidant evenly, put them into barrel A, and bake with dehumidified hot air at 80 - 130 °C for 3 - 12 hours; mix 100 parts of polyester thermoplastic polyurethane, 20 - 60 parts of pre-dispersed titanium dioxide, 1 - 10 parts of slip agent, 1 - 15 parts of matting agent, and 1 - 5 parts of antioxidant evenly, put them into barrel B, and bake with dehumidified hot air at 80 - 130 °C for 3 - 12 hours.

[0017] Step 2: After drying the mixed materials, extrude them through a three-layer coextrusion blown film machine. Feed LDPE with grade 2426 from the first screw, feed the black layer blend from the second screw, and feed the white layer blend from the third screw.

[0018] Step 3: After cooling the film bubble and winding it into shape, obtain a TPU film composite with a PE film.

[0019] Step 4: Peel off the PE film through a slitting system, draw, stretch, and wind the two-color TPU film to obtain a black-and-white double-layer TPU film for curtain fabrics.

[0020] In the third and fourth steps, it is also possible to use an AB double-layer casting machine to cool and form through the die opening, and wind it through a traction system to obtain a black-and-white double-layer TPU film.

[0021] Through the above technical solutions, the black-and-white double-layer TPU film for curtain fabrics provided by the present invention and its preparation method have the following advantages:

[0022] (1) High-efficient covering performance. In the range of thickness from 0.01 - 0.2 mm, this film can shield a fluorescent lamp with a light intensity of 9000 lumens, and there are no light leakage points.

[0023] (2) Excellent dispersion performance of titanium dioxide and carbon black in raw materials, which can effectively solve the problems of light leakage, white dots, and flow marks in the finished film.

[0024] (3) The raw materials are environmentally friendly and pollution-free, the production process is simple and efficient, the yield is high, and the loss is small.

[0025] (4) On the premise of ensuring that the color of the curtain fabric becomes darker, it does not affect its beauty, achieving the purpose of novel design, reasonable process formula, and good application effect. Specific embodiments

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] The present invention will be further described in detail below in conjunction with embodiments and specific implementation manners.

[0028] Embodiment 1.

[0029] A black and white double-layer TPU film for curtain fabrics, comprising a black TPU layer and a white TPU layer, and the thicknesses of both the black PU layer and the white TPU layer are between 0.05 mm and 0.1 mm; the raw materials for preparing the black TPU layer include the following components in parts by weight: 100 parts of polyester-based thermoplastic polyurethane, 30 parts of carbon black, 5 parts of carbon black dispersant, 10 parts of slip agent, 15 parts of matting agent, and 5 parts of antioxidant; the raw materials for preparing the white TPU layer include the following components in parts by weight: 100 parts of polyester-based thermoplastic polyurethane, 20 parts of titanium dioxide, 1 part of titanium dioxide predispersant, 2 parts of slip agent, 3 parts of matting agent, and 1 part of antioxidant. The carbon black is pigment carbon black with an original particle size of 18 - 400 nm. The carbon black dispersant is dodecyl sulfonic acid, an anionic surfactant. The predispersed titanium dioxide is rutile titanium dioxide. The titanium dioxide predispersant is cetyltrimethylammonium bromide, a cationic surfactant. The slip agent is a uniform blend of an organic slip agent and an inorganic antiblocking agent, and the organic slip agent is ethylene bisstearamide; the inorganic antiblocking agent is diatomite. The matting agent is a uniform blend of a matting component and a compatibilizer, and is obtained by uniformly dispersing styrene and the compatibilizer through twin-screw shearing. The compatibilizer is an acrylonitrile-butadiene-styrene copolymer graft-modified copolymer. The graft modification is a graft-modified polymer of glycidyl ester monomer, and the antioxidant is antioxidant 1010.

[0030] The preparation method of the black and white double-layer TPU film for curtain fabrics in this example includes the following steps:

[0031] Step 1: Using a three-layer co-extrusion blown film machine, mix 100 parts of polyester thermoplastic polyurethane, 30 parts of carbon black, 5 parts of carbon black dispersant, 10 parts of slip agent, 15 parts of matting agent, and 5 parts of antioxidant evenly, put them into barrel A, and bake with dehumidified hot air at 130 °C for 3 hours; mix 100 parts of polyester thermoplastic polyurethane, 20 parts of titanium dioxide, 1 part of titanium dioxide pre-dispersant, 2 parts of slip agent, 3 parts of matting agent, and 1 part of antioxidant evenly, put them into barrel B, and bake with dehumidified hot air at 130 °C for 3 hours; the carbon black is pigment carbon black with an original particle size of 18 - 400 nm. The carbon black dispersant is dodecyl sulfonic acid, an anionic surfactant. The pre-dispersed titanium dioxide is rutile titanium dioxide. The titanium dioxide pre-dispersant is cetyltrimethylammonium bromide, a cationic surfactant. The slip agent is a homogeneous blend of an organic slip agent and an inorganic antiblocking agent, and the organic slip agent is ethylene bisstearamide; the inorganic antiblocking agent is diatomaceous earth. The matting agent is a homogeneous blend of a matting component and a compatibilizer, and is obtained by uniformly dispersing styrene and the compatibilizer through twin-screw shearing. The compatibilizer is an acrylonitrile-butadiene-styrene copolymer graft-modified copolymer. The graft modification is a graft-modified polymer of glycidyl ester monomer, and the antioxidant is antioxidant 1010.

[0032] Step 2: After drying the above-mentioned mixture through a melt extruder and extruding it through a three-layer co-extrusion blown film machine, feed LDPE with grade 2426 through the first screw, feed the black layer blend through the second screw, and feed the white layer blend through the third screw;

[0033] Step 3: After cooling the film bubble and winding it into shape, obtain a TPU film composite PE film;

[0034] Step 4: Peel off the PE film through a slitting system, draw, stretch, and wind the two-color TPU film to obtain the black-and-white double-layer TPU film for curtain fabric in this example.

[0035] Example 2.

[0036] A black-and-white double-layer TPU film for curtain fabrics, comprising a black TPU layer and a white TPU layer, with the thickness of both the black TPU layer and the white TPU layer being between 0.05 mm and 0.1 mm; the raw materials for preparing the black TPU layer include the following components in parts by weight: 100 parts of polyester-based thermoplastic polyurethane, 25 parts of carbon black, 4 parts of carbon black dispersant, 8 parts of slip agent, 13 parts of matting agent, and 4 parts of antioxidant; the raw materials for preparing the white TPU layer include the following components in parts by weight: 100 parts of polyester-based thermoplastic polyurethane, 25 parts of titanium dioxide, 2 parts of titanium dioxide pre-dispersant, 3 parts of slip agent, 3 parts of matting agent, and 2 parts of antioxidant. The carbon black is pigment carbon black with an original particle size of 18 - 400 nm. The carbon black dispersant is sodium dodecyl benzene sulfonate, an anionic surfactant. The pre-dispersed titanium dioxide is anatase titanium dioxide. The titanium dioxide pre-dispersant is dodecyl dimethyl benzyl ammonium chloride, a cationic surfactant. The slip agent is a homogeneous blend of an organic slip agent and an inorganic antiblocking agent, and the organic slip agent is ethylene bisoleamide; the inorganic antiblocking agent is talc powder. The matting agent is a homogeneous blend of a matting component and a compatibilizer, and is obtained by uniformly dispersing acrylonitrile-butadiene-styrene copolymer and a compatibilizer through twin-screw shearing. The compatibilizer is acrylonitrile-styrene graft-modified copolymer. The graft modification is a graft-modified polymer of glycidyl ester monomer, and the antioxidant is antioxidant 626.

[0037] In this example, the preparation method of the black-and-white double-layer TPU film for curtain fabrics includes the following steps:

[0038] First step: Using a three-layer co-extrusion blown film machine, mix 100 parts of polyester-based thermoplastic polyurethane, 25 parts of carbon black, 4 parts of carbon black dispersant, 8 parts of slip agent, 13 parts of matting agent, and 4 parts of antioxidant evenly, put them into barrel A, and bake with 110-degree dehumidified hot air for 4 hours; mix 100 parts of polyester-based thermoplastic polyurethane, 25 parts of titanium dioxide, 2 parts of titanium dioxide pre-dispersant, 3 parts of slip agent, 3 parts of matting agent, and 2 parts of antioxidant evenly, put them into barrel B, and bake with 110-degree dehumidified hot air for 4 hours; the carbon black is pigment carbon black with an original particle size of 18 - 400 nm. The carbon black dispersant is sodium dodecyl benzene sulfonate, an anionic surfactant. The pre-dispersed titanium dioxide is anatase titanium dioxide. The titanium dioxide pre-dispersant is dodecyl dimethyl benzyl ammonium chloride, a cationic surfactant. The slip agent is a homogeneous blend of an organic slip agent and an inorganic antiblocking agent, and the organic slip agent is ethylene bisoleamide; the inorganic antiblocking agent is talc powder. The matting agent is a homogeneous blend of a matting component and a compatibilizer, and is obtained by uniformly dispersing acrylonitrile-butadiene-styrene copolymer and a compatibilizer through twin-screw shearing. The compatibilizer is acrylonitrile-styrene graft-modified copolymer. The graft modification is a graft-modified polymer of glycidyl ester monomer, and the antioxidant is antioxidant 626.

[0039] Step 2: After drying the above mixture, extrude it through a three-layer coextrusion blown film machine using a melt extruder. Feed LDPE with grade 2426 through the first screw, feed the black layer blend through the second screw, and feed the white layer blend through the third screw.

[0040] Step 3: After cooling the film bubble and winding it into shape, obtain a TPU film composite PE film.

[0041] Step 4: Peel off the PE film through a slitting system, draw, stretch, and wind the two-color TPU film to obtain a black and white double-layer TPU film for curtain fabrics.

[0042] Example 3.

[0043] A black and white double-layer TPU film for curtain fabrics, comprising a black TPU layer and a white TPU layer, wherein the thickness of both the black PU layer and the white TPU layer is between 0.05 mm and 0.1 mm; the raw materials for preparing the black TPU layer include the following components in parts by weight: 100 parts of polyester-based thermoplastic polyurethane, 20 parts of carbon black, 3 parts of carbon black dispersant, 7 parts of slip agent, 10 parts of matting agent, and 3 parts of antioxidant; the raw materials for preparing the white TPU layer include the following components in parts by weight: 100 parts of polyester-based thermoplastic polyurethane, 30 parts of titanium dioxide, 3 parts of titanium dioxide pre-dispersant, 7 parts of slip agent, 10 parts of matting agent, and 3 parts of antioxidant. The carbon black is pigment carbon black with an original particle size of 18 - 400 nm. The carbon black dispersant is lignosulfonate, an anionic surfactant. The pre-dispersed titanium dioxide is rutile titanium dioxide. The titanium dioxide pre-dispersant is cetyltrimethylammonium chloride, a cationic surfactant. The slip agent is a uniform blend of an organic slip agent and an inorganic antiblocking agent, and the organic slip agent is stearic acid amide; the inorganic antiblocking agent is barium sulfate. The matting agent is a uniform blend of a matting component and a compatibilizer, and is obtained by uniformly dispersing acrylonitrile-styrene copolymer and a compatibilizer through twin-screw shearing. The compatibilizer is a hydrogenated styrene-butadiene block graft-modified copolymer. The graft modification is a graft-modified polymer of glycidyl ester monomer, and the antioxidant is antioxidant 1010.

[0044] The preparation method of the black and white double-layer TPU film for curtain fabrics in this example includes the following steps:

[0045] Step 1: Using a three-layer coextrusion blown film machine, mix 100 parts of polyester thermoplastic polyurethane, 20 parts of carbon black, 3 parts of carbon black dispersant, 7 parts of slip agent, 10 parts of matting agent, and 3 parts of antioxidant evenly, put them into barrel A, and bake with hot air dehumidified at 100 °C for 6 hours; mix 100 parts of polyester thermoplastic polyurethane, 30 parts of titanium dioxide, 3 parts of titanium dioxide pre-dispersant, 7 parts of slip agent, 10 parts of matting agent, and 3 parts of antioxidant evenly, put them into barrel B, and bake with hot air dehumidified at 100 °C for 6 hours.

[0046] Step 2: After drying the mixed materials through a melting extruder and extruding them through a three-layer coextrusion blown film machine, feed LDPE with grade 2426 through the first screw, feed the black layer blend through the second screw, and feed the white layer blend through the third screw.

[0047] Step 3: After the cooled film bubble is wound and formed, a TPU film composite PE film is obtained.

[0048] Step 4: Peel off the PE film through a slitting system, draw, stretch, and wind the two-color TPU film to obtain the black and white double-layer TPU film for curtain fabrics in this example.

[0049] Example 4.

[0050] A black and white double-layer TPU film for curtain fabrics includes a black TPU layer and a white TPU layer, and the thicknesses of both the black PU layer and the white TPU layer are between 0.05 mm and 0.1 mm; the raw materials for preparing the black TPU layer include the following components in parts by weight: 100 parts of polyester thermoplastic polyurethane, 15 parts of carbon black, 3 parts of carbon black dispersant, 6 parts of slip agent, 7 parts of matting agent, and 3 parts of antioxidant; the raw materials for preparing the white TPU layer include the following components in parts by weight: 100 parts of polyester thermoplastic polyurethane, 40 parts of titanium dioxide, 4 parts of titanium dioxide pre-dispersant, 6 parts of slip agent, 9 parts of matting agent, and 4 parts of antioxidant. The carbon black is pigment carbon black with an original particle size of 18 - 400 nm. The carbon black dispersant is sodium carboxymethyl cellulose, an anionic surfactant. The pre-dispersed titanium dioxide is anatase titanium dioxide. The titanium dioxide pre-dispersant is didodecyldimethylammonium chloride, a cationic surfactant. The slip agent is a uniform blend of an organic slip agent and an inorganic antiblocking agent, and the organic slip agent is oleic acid amide; the inorganic antiblocking agent is silica. The matting agent is a uniform blend of a matting component and a compatibilizer, and it is a hydrogenated styrene-butadiene block copolymer, uniformly dispersed with the compatibilizer through twin-screw shearing. The compatibilizer is acrylonitrile-butadiene-styrene graft-modified copolymer. The graft modification is a graft-modified polymer of glycidyl ester monomer, and the antioxidant is antioxidant 626.

[0051] The preparation method of the black and white double-layer TPU film for curtain fabric in this example is characterized by the following steps:

[0052] First step: Using a three-layer co-extrusion blown film machine, 100 parts of polyester thermoplastic polyurethane, 15 parts of carbon black, 3 parts of carbon black dispersant, 6 parts of slip agent, 7 parts of matting agent, and 3 parts of antioxidant are mixed evenly and put into barrel A, and baked with hot air at 90 degrees dehumidified for 8 hours; 100 parts of polyester thermoplastic polyurethane, 40 parts of titanium dioxide, 4 parts of titanium dioxide pre-dispersant, 6 parts of slip agent, 9 parts of matting agent, and 4 parts of antioxidant are mixed evenly and put into barrel B, and baked with hot air at 90 degrees dehumidified for 8 hours.

[0053] Second step: After the dried mixture is extruded through a three-layer co-extrusion blown film machine by a melt extruder, LDPE with grade 2426 is fed by the first screw, the black layer blend is fed by the second screw, and the white layer blend is fed by the third screw.

[0054] Third step: After the cooled film bubble is wound and formed, a TPU film composite PE film is obtained.

[0055] Fourth step: The PE film is peeled off through a slitting system, and the two-color TPU film is drawn, stretched, and wound to obtain the black and white double-layer TPU film for curtain fabric in this example.

[0056] Example 5.

[0057] A black-and-white double-layer TPU film for curtain fabric, comprising a black TPU layer and a white TPU layer, with the thickness of both the black TPU layer and the white TPU layer being between 0.05 mm and 0.1 mm; the raw materials for preparing the black TPU layer include the following components in parts by weight: 100 parts of polyester-based thermoplastic polyurethane, 10 parts of carbon black, 2 parts of carbon black dispersant, 3 parts of slip agent, 3 parts of matting agent, and 2 parts of antioxidant; the raw materials for preparing the white TPU layer include the following components in parts by weight: 100 parts of polyester-based thermoplastic polyurethane, 50 parts of titanium dioxide, 4 parts of titanium dioxide pre-dispersant, 8 parts of slip agent, 12 parts of matting agent, and 4 parts of antioxidant. The carbon black is pigment carbon black with an original particle size of 18 - 400 nm. The carbon black dispersant is sodium lauryl polyoxyethylene sulfate, an anionic surfactant. The pre-dispersed titanium dioxide is anatase titanium dioxide. The titanium dioxide pre-dispersant is a combination of cetyl trimethyl ammonium bromide and dodecyl dimethyl benzyl ammonium chloride, cationic surfactants. The slip agent is a homogeneous blend of an organic slip agent and an inorganic antiblocking agent, and the organic slip agent is erucamide; the inorganic antiblocking agent is calcium carbonate. The matting agent is a homogeneous blend of a matting component and a compatibilizer, and is a styrene-butadiene block copolymer, uniformly dispersed with the compatibilizer through twin-screw shearing. The compatibilizer is an acrylonitrile-butadiene-styrene graft-modified copolymer. The graft modification is a graft-modified polymer of glycidyl ester monomer, and the antioxidant is a mixture of antioxidant 1010 and antioxidant 626.

[0058] In this example, the preparation method of the black-and-white double-layer TPU film for curtain fabric includes the following steps:

[0059] First step: Using a three-layer co-extrusion blown film machine, mix 100 parts of polyester-based thermoplastic polyurethane, 10 parts of carbon black, 2 parts of carbon black dispersant, 3 parts of slip agent, 3 parts of matting agent, and 2 parts of antioxidant evenly, put them into barrel A, and bake with 80-degree dehumidified hot air for 12 hours; mix 100 parts of polyester-based thermoplastic polyurethane, 50 parts of titanium dioxide, 4 parts of titanium dioxide pre-dispersant, 8 parts of slip agent, 12 parts of matting agent, and 4 parts of antioxidant evenly, put them into barrel B, and bake with 80-degree dehumidified hot air for 12 hours;

[0060] Second step: After drying the mixed materials through a melting extruder and extruding them through a three-layer co-extrusion blown film machine, feed LDPE with grade 2426 from the first screw, feed the black layer blend from the second screw, and feed the white layer blend from the third screw;

[0061] Third step: After winding and forming the cooled film bubble, obtain a TPU film composite with a PE film;

[0062] Step 4: Peel off the PE film through the volume dividing system, draw, stretch, and wind up the two-color TPU film to obtain the black-and-white double-layer TPU film for curtain fabric in this example.

[0063] In the above 5 embodiments, the carbon black dispersant in the black-and-white double-layer TPU film formula is an anionic surfactant, including any one or at least two combinations of dodecyl sulfonic acid, sodium dodecylbenzenesulfonate, lignosulfonate, sodium cellulose, or sodium lauryl polyoxyethylene sulfate. The pre-dispersed titanium dioxide is rutile titanium dioxide or anatase titanium dioxide. The titanium dioxide pre-dispersant is a cationic surfactant, including any one or at least two combinations of cetyltrimethylammonium bromide, dodecyldimethylbenzylammonium chloride, cetyltrimethylammonium chloride, or didodecyldimethylammonium chloride. The slip agent is a homogeneous blend of an organic slip agent and an inorganic anti-blocking agent, and the organic slip agent is one or at least two combinations of ethylene bisstearamide, ethylene bisoleamide, stearamide, oleamide, erucamide, and polyethylene wax; the inorganic anti-blocking agent is one or at least two combinations of diatomaceous earth, talc powder, barium sulfate, silicon dioxide, and calcium carbonate. The matting agent is a homogeneous blend of a matting component and a compatibilizer, and is one or at least two combinations of styrene, acrylonitrile-butadiene-styrene copolymer, acrylonitrile-styrene copolymer, hydrogenated styrene-butadiene block copolymer, styrene-butadiene block copolymer, and is obtained by uniformly dispersing through twin-screw shearing with the compatibilizer. The compatibilizer is one or at least two combinations of styrene, acrylonitrile-butadiene-styrene copolymer, acrylonitrile-styrene copolymer, hydrogenated styrene-butadiene block copolymer graft-modified copolymer. The graft modification is a graft-modified polymer of glycidyl ester monomer, and the antioxidant is antioxidant 1010, antioxidant 626, or a mixture composed of antioxidant 1010 and antioxidant 626. Similarly, in the preparation method of the black-and-white double-layer TPU film in the above 5 embodiments, for the baking of the raw materials for the preparation of the black TPU layer in barrel A and the baking of the raw materials for the preparation of the white TPU layer in barrel B, any time and temperature between 3 and 12 hours of hot air baking at 80-130 degrees with dehumidification can be used until the moisture in the raw materials is completely removed. In the manufacturing process, an AB double-layer casting machine can also be used to cool and form through the die mouth, and the black-and-white double-layer TPU film can be obtained by winding through the traction system. For the above content, the present invention will not make special limitations on these. The combination of these raw materials, as well as the manufacturing process, time, and temperature ranges all belong to the protection scope of the present invention.

[0064] In order to further test the various indicators of the black-and-white double-layer TPU film for curtain fabric of the present invention, physical property tests were specifically conducted on it, and the physical property test report is as follows:

[0065]

[0066]

[0067] Meanwhile, to further illustrate the performance of the black-and-white double-layer TPU film for curtain fabrics, the technical routes of the above 5 embodiments are described as follows:

[0068] Due to anionic surfactants, a monolayer can be formed by adsorption on the surface of carbon black, changing the surface transition energy level of the object to be dispersed, reducing the electrostatic attraction between particles, and thus effectively preventing the aggregation and agglomeration of carbon black particles. That is, by introducing charges or forming a charge shielding layer on the surface of carbon black particles through surfactants, the uniform dispersion of carbon black particles is achieved.

[0069] The dispersants with opposite electrostatic properties are used in the black and white layers, which can reduce the diffusion phenomenon at the contact surface, prevent the penetration of carbon black into the white layer, make the white layer whiter and stripe-free.

[0070] The cationic surfactant in the white layer can generate a strong dispersion force and charge interaction on the titanium ions of titanium dioxide. The non-polar chain segment of the surfactant can well form a molecular entanglement with the TPU chain segment, achieving excellent dispersibility.

[0071] Therefore, the black-and-white double-layer TPU film for curtain fabrics and its preparation method provided by the present invention have the following advantages: high-efficiency covering performance. In the range of thickness from 0.01 to 0.2 mm, this film can shield a fluorescent lamp with a luminous intensity of 9000 lumens without light leakage points. Excellent dispersion performance of titanium dioxide and carbon black as raw materials, which can effectively solve the problems such as light leakage, white spots and flow marks in the finished film. The raw materials are environmentally friendly and pollution-free, the manufacturing process is simple and efficient, the yield is high, and the loss is small. On the premise of ensuring that the color of the curtain fabric becomes darker, it does not affect its beauty, achieving the purposes of novel design, reasonable process formula and good application effect.

[0072] The above is only a preferred embodiment of the black-and-white double-layer TPU film for curtain fabrics and its preparation method of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present invention.

Claims

1. A black-and-white double-layer TPU film for curtain fabrics, characterized in that, It includes a black TPU layer and a white TPU layer, and the thicknesses of both the black PU layer and the white TPU layer are between 0.05 mm and 0.1 mm; the raw materials for preparing the black TPU layer include the following components in parts by weight: 100 parts of polyester thermoplastic polyurethane, 5 - 30 parts of carbon black, 1 - 5 parts of carbon black dispersant, 1 - 10 parts of slip agent, 1 - 15 parts of matting agent, and 1 - 5 parts of antioxidant; the raw materials for preparing the white TPU layer include the following components in parts by weight: 100 parts of polyester thermoplastic polyurethane, 20 - 60 parts of titanium dioxide, 1 - 5 parts of titanium dioxide pre-dispersant, 1 - 10 parts of slip agent, 1 - 15 parts of matting agent, and 1 - 5 parts of antioxidant.

2. The black-and-white double-layer TPU film for curtain fabric according to claim 1, wherein The carbon black is pigment carbon black, and its original particle size is 18 - 400 nm.

3. A black and white double-layer TPU film for curtain fabrics according to claim 2, characterized in that, The carbon black dispersant is an anionic surfactant, including any one or at least two combinations of dodecyl sulfonic acid, sodium dodecyl benzene sulfonate, lignosulfonate, sodium carboxymethyl cellulose, or sodium lauryl polyoxyethylene ether sulfate.

4. A black and white double-layer TPU film for curtain fabric according to claim 3, characterized in that, The pre-dispersed titanium dioxide is rutile titanium dioxide or anatase titanium dioxide.

5. A black and white double-layer TPU film for curtain fabrics according to claim 4, characterized in that, The titanium dioxide pre-dispersant is a cationic surfactant, including any one or at least two combinations of cetyl trimethyl ammonium bromide, dodecyl dimethyl benzyl ammonium chloride, cetyl trimethyl ammonium chloride, or didodecyl dimethyl ammonium chloride.

6. A black and white double-layer TPU film for curtain fabrics according to claim 5, characterized in that, The slip agent is a homogeneous blend of an organic slip agent and an inorganic antiblocking agent, and the organic slip agent is one or at least two combinations of ethylene bisstearamide, ethylene bisoleamide, stearamide, oleamide, erucamide, and polyethylene wax; the inorganic antiblocking agent is one or at least two combinations of diatomite, talc, barium sulfate, silicon dioxide, and calcium carbonate.

7. A black and white double-layer TPU film for curtain fabric according to claim 6, characterized in that, The matting agent is a homogeneous blend of a matting component and a compatibilizer, and it is one or at least two combinations of styrene, acrylonitrile-butadiene-styrene copolymer, acrylonitrile-styrene copolymer, hydrogenated styrene-butadiene block copolymer, styrene-butadiene block copolymer, and is obtained by uniformly dispersing through twin-screw shearing with the compatibilizer.

8. A black and white double-layer TPU film for curtain fabrics according to claim 7, characterized in that, The compatibilizer is one or at least two combinations of styrene, acrylonitrile-butadiene-styrene copolymer, acrylonitrile-styrene copolymer, hydrogenated styrene-butadiene block copolymer graft-modified copolymer.

9. A black-and-white double-layer TPU film for curtain fabric according to claim 8, characterized in that, The graft modification is a graft-modified polymer of glycidyl ester monomer, and the antioxidant is antioxidant 1010, antioxidant 626, or a mixture composed of antioxidant 1010 and antioxidant 626.

10. A preparation method of a black-and-white double-layer TPU film for curtain fabrics, characterized in that, It includes the following steps: First step, use a three-layer co-extrusion blown film machine to uniformly mix 100 parts of polyester thermoplastic polyurethane, 5 - 30 parts of pre-dispersed carbon black, 1 - 10 parts of slip agent, 1 - 15 parts of matting agent, and 1 - 5 parts of antioxidant, put them into barrel A, and bake with hot air at 80 - 130 degrees for 3 - 12 hours; uniformly mix 100 parts of polyester thermoplastic polyurethane, 20 - 60 parts of pre-dispersed titanium dioxide, 1 - 10 parts of slip agent, 1 - 15 parts of matting agent, and 1 - 5 parts of antioxidant, put them into barrel B, and bake with hot air at 80 - 130 degrees for 3 - 12 hours; Step 2: After drying the mixture, extrude it through a three-layer coextrusion blown film machine using a melt extruder. Feed LDPE with grade 2426 through the first screw, feed the black layer blend through the second screw, and feed the white layer blend through the third screw. Step 3: After winding up and forming the cooled film bubble, obtain a TPU film composite PE film. Step 4: Peel off the PE film through a slitting system, draw, stretch, and wind up the two-color TPU film to obtain a black-and-white double-layer TPU film for curtain fabrics.

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