PET (Polyethylene Terephthalate) color master batch for car window side film as well as preparation and application of PET color master batch

Abstract

The invention discloses a PET (Polyethylene Terephthalate) color master batch for a car window side film as well as preparation and application of the PET color master batch. The formula of the PET color master batch for the car window side film comprises the following components in parts by weight: 70-80 parts of a carrier, 1-5 parts of a first carbon black pigment, 15-20 parts of a second carbon black pigment, 0-10 parts of a non-carbon black dye and 0-0.9 part of a processing aid. The preparation method of the PET color master batch for the car window side film comprises the following steps: weighing and uniformly mixing the raw materials, and putting the raw materials into a twin-screw extruder for extrusion granulation to obtain the color master batch. The PET color master batch for the car window side film provided by the invention can effectively prevent static electricity generated by friction in subsequent production, and is very suitable for the field of car window side films. Meanwhile, the PET color master batch applied to the car window side film has the characteristics of good dispersity and low haze in film casting.

Description

Technical Field

[0001] The present invention belongs to the technical field of color masterbatches for window side films, and particularly relates to a PET color masterbatch for window side films, its preparation and application. Background Art

[0002] Due to the good mechanical strength, photothermal stability, high insulation, and resistance to aging and creep of polyethylene terephthalate (PET), it is widely used in optical films, especially in the field of window films. In the usage scenario of window films, generally, the front and rear windshield films of cars require high light transmittance, while the side window glasses of cars need low light transmittance films to protect the privacy of passengers. The preparation process of window side films is: mixing PET masterbatch and color masterbatch, followed by casting and stretching into films. During the production and mixing of color masterbatches, static electricity is extremely likely to be generated, resulting in uneven material dropping and affecting the optical effect of window side films. In addition, residual static electricity is also likely to interfere with in-vehicle communication devices and damage the films.

[0003] During the driving of a car, the passengers inside the car need to clearly see the outside scene. Therefore, in addition to the requirement of light transmittance, the requirement for low haze performance of window films is also extremely high. The thickness of the film, surface flatness, refractive index, phase state, particle size of the material, etc. are all factors affecting haze. The haze values of commercially available window side films are mostly above 2. To meet the requirement of high clarity, the haze of high-definition films needs to be lower than 1.5.

[0004] Carbon black is a non-crystalline pigment and also an excellent conductor. It has research significance on how to achieve the coloring of window side films by combining carbon black with a carrier without significantly increasing the haze of the film. Summary of the Invention

[0005] Aiming at the problems of excessive residual static electricity in the PET color masterbatch of existing window side films and high haze after film formation, the primary object of the present invention is to provide a PET color masterbatch for window side films. By compounding carbon blacks with different oil absorption values, the PET color masterbatch of the present invention can effectively avoid the static electricity generated by friction during the production process, and has good dispersibility and low haze after casting into films, achieving the technical effect of coloring window side films without significantly increasing the haze of the film.

[0006] The second object of the present invention is to provide a preparation method for the above-mentioned PET color masterbatch for window side films.

[0007] The third object of the present invention is to provide the application of the above-mentioned PET color masterbatch for window side films.

[0008] The objects of the present invention are achieved through the following technical solutions:

[0009] A PET masterbatch for side window films, by weight, comprises the following components: 70-80 parts of a carrier, 1-5 parts of a first carbon black pigment, 15-20 parts of a second carbon black pigment, 0-10 parts of a non-carbon black dye, and 0-0.9 parts of a processing aid.

[0010] Preferably, the PET masterbatch for side window films, by weight, comprises the following components:

[0011] 70-80 parts of a carrier, 1-3 parts of a first carbon black pigment, 17-20 parts of a second carbon black pigment, 1-6 parts of a non-carbon black dye, and 0-0.9 parts of a processing aid.

[0012] More preferably, the PET masterbatch for side window films, by weight, comprises the following components:

[0013] 75-80 parts of a carrier, 1-2 parts of a first carbon black pigment, 17-19 parts of a second carbon black pigment, 1-3 parts of a non-carbon black dye, and 0-0.9 parts of a processing aid.

[0014] The oil absorption of the first carbon black pigment ≥ 120 ml / 100 g; more preferably 120-200 ml / 100 g.

[0015] Preferably, the first carbon black pigment is at least one of Cabot VULCAN XC72R, VULCAN XC605, and VULCAN XC305.

[0016] The oil absorption of the second carbon black pigment ≤ 70 ml / 100 g; more preferably 20-70 ml / 100 g.

[0017] Preferably, the second carbon black pigment is at least one of Cabot MOGUI L, REGAL 330R, and REGAL 99R.

[0018] In the present invention, the amount of the carbon black pigment with a high oil absorption value is relatively small, which can play a role in filling and conducting electricity; the amount of the carbon black pigment with a low oil absorption value is relatively large, which can play a role in dispersion. By compounding two carbon blacks with different oil absorption values, the composite system can obtain good dispersibility and conductivity, and further make the film colored and have a low haze.

[0019] The carrier is at least one of polyethylene terephthalate (PET), 1,2-propanediol copolymer modified PET (PPET), 1,4-cyclohexanedimethanol copolymer modified PET (PETG), and neopentyl glycol copolymer modified PET.

[0020] Preferably, the intrinsic viscosity of the carrier is 0.6-1 dL / g.

[0021] Preferably, the mass percentage content of 1,2 - propanediol in the 1,2 - propanediol copolymer - modified PET (PPET) is 70 - 80%; the mass percentage content of 1,4 - cyclohexanedimethanol in the 1,4 - cyclohexanedimethanol copolymer - modified PET (PETG) is 70 - 80%; the mass percentage content of neopentyl glycol in the neopentyl glycol copolymer - modified PET is 70 - 80%.

[0022] Preferably, the carrier is PETG.

[0023] The non - carbon black dye is at least one of mono - azo, bis - azo, anthraquinone, and heterocyclic types.

[0024] Preferably, the mono - azo type is at least one of Pigment Yellow 62, Pigment Red 170, Pigment Orange 64, Pigment Violet 32, and Pigment Brown 25.

[0025] Preferably, the bis - azo type is at least one of Pigment Yellow 12, Pigment Orange 13, Pigment Red 144, and Pigment Brown 23.

[0026] Preferably, the anthraquinone type is at least one of Disperse Red 9, Disperse Violet 26, and Disperse Yellow 54.

[0027] Preferably, the heterocyclic type is at least one of Pigment Violet 23, Pigment Red 122, Pigment Yellow 109, Pigment Orange 61, and Pigment Blue 60.

[0028] The processing aids are at least one of dispersants, lubricants, antioxidants, and coupling agents, etc.

[0029] Preferably, the dispersant is at least one of paraffin wax, polyethylene wax, montan wax, and polyester wax.

[0030] Preferably, the lubricant is at least one of stearic acid amide, oleic acid amide, erucic acid amide, n - butyl stearate, and glyceryl trihydroxystearate.

[0031] Preferably, the antioxidant is at least one of N,N - bis(n - octadecyl)hydroxylamine, N,N - dibenzylhydroxylamine, and N - benzoyl - N - phenylhydroxylamine.

[0032] Preferably, the coupling agent is at least one of trimethylolpropane trimethacrylate, triallyl cyanurate, and tert - butyl peroxy - 2 - ethylhexyl carbonate.

[0033] The present invention also provides a preparation method of the above - mentioned PET color masterbatch for window side - sticking films, which comprises the following steps:

[0034] Mix the carrier, the first carbon black pigment, the second carbon black pigment, the non-carbon black dye and the processing aid evenly, and then put them into a twin-screw extruder for extrusion granulation at 230-250 °C to obtain PET color masterbatch.

[0035] Preferably, the mixing speed is 800-1200 r / min and the time is 3-5 min.

[0036] Preferably, the screw rotation direction of the twin-screw extruder is the same, the screw diameter is 30 mm, the screw length-diameter ratio is 28, and the main machine frequency of the twin-screw extruder is 10-30 Hz.

[0037] The present invention also provides the application of the above-mentioned PET color masterbatch for window side film in the preparation of window side film and non-window glass film.

[0038] Preferably, the non-window glass film is home window film and mobile phone film.

[0039] Preferably, in the above application, the PET color masterbatch for window side film and the PET masterbatch are 10-20 parts and 80-90 parts by weight respectively.

[0040] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0041] By compounding two kinds of carbon blacks with different oil absorption values, the PET color masterbatch of the present invention can effectively avoid the static electricity generated by friction during the production process, and has good dispersibility and low haze after casting into a film, realizing the technical effect of coloring the window side film without significantly increasing the haze of the film, and obtaining a high-definition and anti-static window side film color masterbatch. Description of the Drawings

[0042] Figure 1 It is the color masterbatch of Example 1.

[0043] Figure 2 It is the cast roll of Example 1.

[0044] Figure 3 It is the double-drawn film of Example 1. Detailed Embodiments

[0045] The following further describes the present invention in detail with reference to the embodiments and the drawings, but the embodiments of the present invention are not limited thereto.

[0046] In the embodiments of the present invention, those not specified under specific conditions are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The raw materials, reagents, etc. not specified by the manufacturer can all be obtained as conventional products through commercial purchase.

[0047] The main representative materials used in the examples and comparative examples are as follows:

[0048] PETG / PETG masterbatch: Eastman PCTG-DN011 from the United States. Intrinsic viscosity is 0.65 dL / g.

[0049] PET: CR-8816 from Zhuhai Huaren Chemical Materials Technology Co., Ltd., intrinsic viscosity is 0.8 dL / g.

[0050] VULCAN XC72R: Oil absorption value is 192 ml / 100 g, particle size is 30 nm, provided by Cabot.

[0051] VULCAN XC605: Oil absorption value is 174 ml / 100 g, particle size is 30 nm, provided by Cabot.

[0052] VULCAN XC305: Oil absorption value is 131 ml / 100 g, particle size is 30 nm, provided by Cabot.

[0053] MOGUI L: Oil absorption value is 62 ml / 100 g, particle size is 24 nm, provided by Cabot.

[0054] REGAL 330R: Oil absorption value is 65 ml / 100 g, particle size is 25 nm, provided by Cabot.

[0055] REGAL 99R: Oil absorption value is 65 ml / 100 g, particle size is 36 nm, provided by Cabot.

[0056] MONARCH 880: Oil absorption value is 112 ml / 100 g, particle size is 16 nm, provided by Cabot.

[0057] Example 1

[0058] Weigh 750 g of PETG, 20 g of VULCAN XC72R, 190 g of MOGUI L, 15 g each of Pigment Yellow 62 and Pigment Violet 32, 5 g of polyester wax, 3 g of stearic acid amide, and 1 g of N,N-bis(n-octadecyl)hydroxylamine into a high-speed mixer. Start the high-speed stirring at 800 - 1200 r / min for 3 - 5 min. Set the barrel temperature of the co-rotating twin-screw extruder as 230 °C in Zone 1, 250 °C in Zones 2 - 4, 240 °C in Zone 5, and the die head temperature as 230 °C. After the temperature is stable, put the uniformly mixed materials into the twin-screw extruder for blending, extrusion, and traction, and obtain PET color masterbatch through water-cooled pelletizing. Dry the PET color masterbatch in an oven at 150 °C for 4 h and then set aside for use.

[0059] Weigh 150 g of PET masterbatch and 850 g of PETG masterbatch into a high-speed mixer. Start the high-speed mixing at a rotation speed of 800 - 1200 r / min for 3 - 5 min. Set the temperature control of the casting machine as follows: zone 1 at 260 °C, zone 2 at 260 °C, zones 3 - 5 at 270 °C, and the die head temperature at 275 °C. Set the traction roller line speed at 2.5 m / min. After the temperature stabilizes, put the evenly mixed masterbatch into the casting machine for blending, extrusion, casting, and traction to obtain a thin sheet with a thickness of 0.15 mm. Set the temperature of the biaxial stretching machine at 105 °C, the stretching ratio at 2.7×2.7, and the stretching rate at 30×30 mm / s. The thin sheet is biaxially stretched to obtain a film with a thickness of 0.021 mm.

[0060] Example 2

[0061] Weigh 750 g of PETG, 20 g of VULCAN XC605, 190 g of REGAL 330R, 15 g each of Disperse Violet 26 and Disperse Yellow 54, 5 g of polyester wax, 3 g of stearic acid amide, and 1 g of N,N-bis(n-octadecyl)hydroxylamine into a high-speed mixer. Start the high-speed mixing at a rotation speed of 800 - 1200 r / min for 3 - 5 min. Set the temperature control of the co-rotating twin-screw extruder barrel as follows: zone 1 at 230 °C, zones 2 - 4 at 250 °C, zone 5 at 240 °C, and the die head temperature at 230 °C. After the temperature stabilizes, put the evenly mixed materials into the twin-screw extruder for blending, extrusion, and traction, and obtain PET masterbatch through water-cooled pelletizing. Dry the PET masterbatch in an oven at 150 °C for 4 h for later use.

[0062] Weigh 150 g of PET masterbatch and 850 g of PETG masterbatch into a high-speed mixer. Start the high-speed mixing at a rotation speed of 800 - 1200 r / min for 3 - 5 min. Set the temperature control of the casting machine as follows: zone 1 at 260 °C, zone 2 at 260 °C, zones 3 - 5 at 270 °C, and the die head temperature at 275 °C. Set the traction roller line speed at 2.5 m / min. After the temperature stabilizes, put the evenly mixed masterbatch into the casting machine for blending, extrusion, casting, and traction to obtain a thin sheet with a thickness of 0.15 mm. Set the temperature of the biaxial stretching machine at 105 °C, the stretching ratio at 2.7×2.7, and the stretching rate at 30×30 mm / s. The thin sheet is biaxially stretched to obtain a film with a thickness of 0.021 mm.

[0063] Example 3

[0064] Weigh 750 g of PETG, 20 g of VULCAN XC305, 190 g of REGAL 99R, 15 g each of Pigment Violet 32 and Pigment Yellow 109, 5 g of polyester wax, 3 g of stearic acid amide, and 1 g of N,N-bis(n-octadecyl)hydroxylamine into a high-speed mixer. Start high-speed stirring at a speed of 800 - 1200 r / min for 3 - 5 min. Set the barrel temperature of the co-rotating twin-screw extruder as 230 °C in Zone 1, 250 °C in Zones 2 - 4, 240 °C in Zone 5, and the die head temperature as 230 °C. After the temperature stabilizes, put the uniformly mixed materials into the twin-screw extruder for blending, extrusion, and traction, and obtain PET masterbatch through water-cooled pelletizing. Dry the PET masterbatch in an oven at 150 °C for 4 h and then set it aside for use.

[0065] Weigh 150 g of PET masterbatch and 850 g of PETG masterbatch into a high-speed mixer. Start high-speed stirring at a speed of 800 - 1200 r / min for 3 - 5 min. Set the temperature of the casting machine as 260 °C in Zone 1, 260 °C in Zone 2, 270 °C in Zones 3 - 5, and the die head temperature as 275 °C, and set the traction roller line speed as 2.5 m / min. After the temperature stabilizes, put the uniformly mixed masterbatch into the casting machine for blending, extrusion, casting, and traction to obtain a thin plate with a thickness of 0.15 mm. Set the temperature of the biaxial stretching machine as 105 °C, the stretching ratio as 2.7×2.7, and the stretching rate as 30×30 mm / s. The thin plate is biaxially stretched to obtain a film with a thickness of 0.021 mm.

[0066] Example 4

[0067] Weigh 800 g of PETG, 10 g of VULCAN XC72R, 170 g of MOGUI L, 5 g each of Pigment Yellow 62 and Pigment Violet 32, 5 g of polyester wax, 3 g of stearic acid amide, and 1 g of N,N-bis(n-octadecyl)hydroxylamine into a high-speed mixer. Start high-speed stirring at a speed of 800 - 1200 r / min for 3 - 5 min. Set the barrel temperature of the co-rotating twin-screw extruder as 230 °C in Zone 1, 250 °C in Zones 2 - 4, 240 °C in Zone 5, and the die head temperature as 230 °C. After the temperature stabilizes, put the uniformly mixed materials into the twin-screw extruder for blending, extrusion, and traction, and obtain PET masterbatch through water-cooled pelletizing. Dry the PET masterbatch in an oven at 150 °C for 4 h and then set it aside for use.

[0068] Weigh 150 g of PET masterbatch and 850 g of PETG masterbatch into a high-speed mixer. Start the high-speed mixing at a rotational speed of 800 - 1200 r / min for 3 - 5 min. Set the temperature control of the casting machine as follows: Zone 1 at 260 °C, Zone 2 at 260 °C, Zones 3 - 5 at 270 °C, and the die head temperature at 275 °C. Set the traction roller line speed at 2.5 m / min. After the temperature stabilizes, put the uniformly mixed masterbatch into the casting machine for blending, extrusion, casting, and traction to obtain a thin plate with a thickness of 0.15 mm. Set the temperature of the biaxial stretching machine at 105 °C, the stretching ratio at 2.7×2.7, and the stretching rate at 30×30 mm / s. The thin plate is biaxially stretched to obtain a film with a thickness of 0.021 mm.

[0069] Example 5

[0070] Weigh 700 g of PETG, 30 g of VULCAN XC72R, 200 g of MOGUI L, 30 g each of Pigment Yellow 62 and Pigment Violet 32, 5 g of polyester wax, 3 g of stearic acid amide, and 1 g of N,N-bis(n-octadecyl)hydroxylamine into a high-speed mixer. Start the high-speed mixing at a rotational speed of 800 - 1200 r / min for 3 - 5 min. Set the temperature control of the co-rotating twin-screw extruder barrel as follows: Zone 1 at 230 °C, Zones 2 - 4 at 250 °C, Zone 5 at 240 °C, and the die head temperature at 230 °C. After the temperature stabilizes, put the uniformly mixed materials into the twin-screw extruder for blending, extrusion, and traction, and obtain PET masterbatch through water-cooled pelletizing. Dry the PET masterbatch in an oven at 150 °C for 4 h and then set it aside for use.

[0071] Weigh 150 g of PET masterbatch and 850 g of PETG masterbatch into a high-speed mixer. Start the high-speed mixing at a rotational speed of 800 - 1200 r / min for 3 - 5 min. Set the temperature control of the casting machine as follows: Zone 1 at 260 °C, Zone 2 at 260 °C, Zones 3 - 5 at 270 °C, and the die head temperature at 275 °C. Set the traction roller line speed at 2.5 m / min. After the temperature stabilizes, put the uniformly mixed masterbatch into the casting machine for blending, extrusion, casting, and traction to obtain a thin plate with a thickness of 0.15 mm. Set the temperature of the biaxial stretching machine at 105 °C, the stretching ratio at 2.7×2.7, and the stretching rate at 30×30 mm / s. The thin plate is biaxially stretched to obtain a film with a thickness of 0.021 mm.

[0072] Example 6

[0073] Weigh 750 g of PETG, 20 g of VULCAN XC72R, 200 g of MOGUI L, 15 g each of Pigment Yellow 62 and Pigment Violet 32 into a high-speed mixer. Start high-speed stirring at a speed of 800 - 1200 r / min for 3 - 5 min. Set the barrel temperature of the co-rotating twin-screw extruder as 230 °C in Zone 1, 250 °C in Zones 2 - 4, 240 °C in Zone 5, and the die head temperature as 230 °C. After the temperature stabilizes, put the uniformly mixed material into the twin-screw extruder for blending, extrusion, and traction, and obtain PET masterbatch through water-cooled pelletizing. Dry the PET masterbatch in an oven at 150 °C for 4 h for later use.

[0074] Weigh 150 g of PET masterbatch and 850 g of PETG masterbatch into a high-speed mixer. Start high-speed stirring at a speed of 800 - 1200 r / min for 3 - 5 min. Set the temperature control of the casting machine as 260 °C in Zone 1, 260 °C in Zone 2, 270 °C in Zones 3 - 5, the die head temperature as 275 °C, and the traction roller line speed as 2.5 m / min. After the temperature stabilizes, put the uniformly mixed masterbatch into the casting machine for blending, extrusion, casting, and traction to obtain a thin plate with a thickness of 0.15 mm. Set the temperature of the biaxial stretching machine as 105 °C, the stretching ratio as 2.7×2.7, and the stretching rate as 30×30 mm / s. The thin plate is biaxially stretched to obtain a film with a thickness of 0.021 mm.

[0075] Comparative Example 1

[0076] Weigh 1000 g of PETG. Set the barrel temperature of the co-rotating twin-screw extruder as 230 °C in Zone 1, 250 °C in Zones 2 - 4, 240 °C in Zone 5, and the die head temperature as 230 °C. After the temperature stabilizes, put the uniformly mixed material into the twin-screw extruder for blending, extrusion, and traction, and obtain PET masterbatch through water-cooled pelletizing. Dry the PET masterbatch in an oven at 150 °C for 4 h for later use.

[0077] Weigh 150 g of PET masterbatch and 850 g of PETG masterbatch into a high-speed mixer. Start high-speed stirring at a speed of 800 - 1200 r / min for 3 - 5 min. Set the temperature control of the casting machine as 260 °C in Zone 1, 260 °C in Zone 2, 270 °C in Zones 3 - 5, the die head temperature as 275 °C, and the traction roller line speed as 2.5 m / min. After the temperature stabilizes, put the uniformly mixed masterbatch into the casting machine for blending, extrusion, casting, and traction to obtain a thin plate with a thickness of 0.15 mm. Set the temperature of the biaxial stretching machine as 105 °C, the stretching ratio as 2.7×2.7, and the stretching rate as 30×30 mm / s. The thin plate is biaxially stretched to obtain a film with a thickness of 0.021 mm.

[0078] Comparative Example 2

[0079] Weigh 750 g of PETG, 210 g of MONARCH 880, 15 g each of Pigment Yellow 62 and Pigment Violet 32, 5 g of polyester wax, 3 g of stearic acid amide, and 1 g of N,N-bis(n-octadecyl)hydroxylamine into a high-speed mixer. Start high-speed stirring at a rotational speed of 800 - 1200 r / min for 3 - 5 min. Set the barrel temperature of the co-rotating twin-screw extruder as 230 °C in Zone 1, 250 °C in Zones 2 - 4, 240 °C in Zone 5, and the die head temperature as 230 °C. After the temperature stabilizes, put the uniformly mixed material into the twin-screw extruder for blending, extrusion, and traction, and obtain PET masterbatch through water-cooled pelletizing. Dry the PET masterbatch in an oven at 150 °C for 4 h and set aside for use.

[0080] Weigh 150 g of PET masterbatch and 850 g of PETG masterbatch into a high-speed mixer. Start high-speed stirring at a rotational speed of 800 - 1200 r / min for 3 - 5 min. Set the temperature of the casting machine as 260 °C in Zone 1, 260 °C in Zone 2, 270 °C in Zones 3 - 5, and the die head temperature as 275 °C, and set the traction roller line speed as 2.5 m / min. After the temperature stabilizes, put the uniformly mixed masterbatch into the casting machine for blending, extrusion, casting, and traction to obtain a thin plate with a thickness of 0.15 mm. Set the temperature of the biaxial stretching machine as 105 °C, the stretching ratio as 2.7×2.7, and the stretching rate as 30×30 mm / s. The thin plate is biaxially stretched to obtain a film with a thickness of 0.021 mm.

[0081] Comparative Example 3

[0082] Weigh 750 g of PETG, 210 g of VULCAN XC72R, 15 g each of Pigment Yellow 62 and Pigment Violet 32, 5 g of polyester wax, 3 g of stearic acid amide, and 1 g of N,N-bis(n-octadecyl)hydroxylamine into a high-speed mixer. Start high-speed stirring at a rotational speed of 800 - 1200 r / min for 3 - 5 min. Set the barrel temperature of the co-rotating twin-screw extruder as 230 °C in Zone 1, 250 °C in Zones 2 - 4, 240 °C in Zone 5, and the die head temperature as 230 °C. After the temperature stabilizes, put the uniformly mixed material into the twin-screw extruder for blending, extrusion, and traction, and obtain PET masterbatch through water-cooled pelletizing. Dry the PET masterbatch in an oven at 150 °C for 4 h and set aside for use.

[0083] Weigh 150 g of PET masterbatch and 850 g of PETG masterbatch into a high-speed mixer. Start the high-speed mixing at a rotational speed of 800 - 1200 r / min for 3 - 5 min. Set the temperature control of the casting machine as follows: Zone 1 at 260 °C, Zone 2 at 260 °C, Zones 3 - 5 at 270 °C, and the die head temperature at 275 °C. Set the traction roller line speed at 2.5 m / min. After the temperature stabilizes, put the uniformly mixed masterbatch into the casting machine for blending, extrusion, casting, and traction to obtain a thin sheet with a thickness of 0.15 mm. Set the temperature of the biaxial stretching machine at 105 °C, the stretching ratio at 2.7×2.7, and the stretching rate at 30×30 mm / s. The thin sheet is biaxially stretched to obtain a film with a thickness of 0.021 mm.

[0084] Comparative Example 4

[0085] Weigh 750 g of PETG, 210 g of MOGUI L, 15 g each of Pigment Yellow 62 and Pigment Violet 32, 5 g of polyester wax, 3 g of stearic acid amide, and 1 g of N,N-bis(n-octadecyl)hydroxylamine into a high-speed mixer. Start the high-speed mixing at a rotational speed of 800 - 1200 r / min for 3 - 5 min. Set the temperature control of the co-rotating twin-screw extruder barrel as follows: Zone 1 at 230 °C, Zones 2 - 4 at 250 °C, Zone 5 at 240 °C, and the die head temperature at 230 °C. After the temperature stabilizes, put the uniformly mixed material into the twin-screw extruder for blending, extrusion, and traction, and obtain PET masterbatch through water-cooled pelletizing. Dry the PET masterbatch in an oven at 150 °C for 4 h for later use.

[0086] Weigh 150 g of PET masterbatch and 850 g of PETG masterbatch into a high-speed mixer. Start the high-speed mixing at a rotational speed of 800 - 1200 r / min for 3 - 5 min. Set the temperature control of the casting machine as follows: Zone 1 at 260 °C, Zone 2 at 260 °C, Zones 3 - 5 at 270 °C, and the die head temperature at 275 °C. Set the traction roller line speed at 2.5 m / min. After the temperature stabilizes, put the uniformly mixed masterbatch into the casting machine for blending, extrusion, casting, and traction to obtain a thin sheet with a thickness of 0.15 mm. Set the temperature of the biaxial stretching machine at 105 °C, the stretching ratio at 2.7×2.7, and the stretching rate at 30×30 mm / s. The thin sheet is biaxially stretched to obtain a film with a thickness of 0.021 mm.

[0087] Compact and lay flat the PET masterbatch, and conduct static electricity testing using an ACL staticide800 surface resistance tester. Cut the film into 5×5 cm 2 , and conduct transmittance and haze testing using an X-Rite C17800 spectrophotometer, with the testing mode being transmission. The results are shown in Table 1 below.

[0088] The transmittance and haze testing refer to the American Society for Testing and Materials standard ASTM D1003-61(1997).

[0089] Table 1

[0090]

[0091] As can be seen from Table 1, by reasonably matching carbon black with two absorption oil values, the haze of Examples 1-5 is reduced compared with that of the comparative example, and the hiding power is better. Due to the addition of the second component of conductive carbon black, the resistance of the examples is lower and the surface anti-static ability is stronger.

[0092] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A PET masterbatch for vehicle window side film, characterized in that: The composition comprises the following components by weight: 70-80 parts of a carrier, 1-5 parts of a first carbon black pigment, 15-20 parts of a second carbon black pigment, 0-10 parts of a non-carbon black dye, and 0-0.9 parts of a processing aid; The oil absorption of the first carbon black pigment is ≥120ml / 100g; The oil absorption of the second carbon black pigment is ≤70ml / 100g.

2. The PET masterbatch for vehicle window side film according to claim 1, characterized in that: By weight, it includes the following components: 70-80 parts of carrier, 1-3 parts of first carbon black pigment, 17-20 parts of second carbon black pigment, 1-6 parts of non-carbon black dye, 0-0.9 parts of processing aid; Or 75-80 parts of a carrier, 1-2 parts of a first carbon black pigment, 17-19 parts of a second carbon black pigment, 1-3 parts of a non-carbon black dye, and 0-0.9 parts of a processing aid.

3. A PET masterbatch for vehicle window side film according to claim 1 or 2, characterized in that: The oil absorption of the first carbon black pigment is 120-200 ml / 100 g; The oil absorption of the second carbon black pigment is 20-70 ml / 100 g.

4. The PET masterbatch for vehicle window side film according to claim 3, characterized in that: The first carbon black pigment is at least one of Cabot VULCAN XC72R, VULCAN XC605 and VULCAN XC305; The second carbon black pigment is at least one of Cabot MOGUI L, REGAL 330R and REGAL 99R.

5. The PET masterbatch for vehicle window side film according to claim 1 or 2, characterized in that: The carrier is at least one of polyethylene terephthalate, 1,2-propylene glycol copolymer modified PET, 1,4-cyclohexanedimethanol copolymer modified PET and neopentyl glycol copolymer modified PET; The carrier has a characteristic viscosity of 0.6-1 dL / g.

6. The PET masterbatch for vehicle window side film according to claim 5, characterized in that: The mass percentage of 1,2-propylene glycol in the 1,2-propylene glycol copolymer modified PET is 70-80%; The mass percentage of 1,4-cyclohexanedimethanol in the 1,4-cyclohexanedimethanol copolymer modified PET is 70-80%; The mass percentage of neopentyl glycol in the neopentyl glycol copolymer-modified PET is 70-80%.

7. The PET masterbatch for vehicle window side film according to claim 1 or 2, characterized in that: The non-carbon black dye is at least one of monoazo, disazo, anthraquinone and heterocyclic; The monoazo is at least one of Pigment Yellow 62, Pigment Red 170, Pigment Orange 64, Pigment Violet 32 ​​and Pigment Brown 25; The disazo is at least one of Pigment Yellow 12, Pigment Orange 13, Pigment Red 144 and Pigment Brown 23; The anthraquinone is at least one of Disperse Red 9, Disperse Violet 26 and Disperse Yellow 54; The heterocyclic ring is at least one of Pigment Violet 23, Pigment Red 122, Pigment Yellow 109, Pigment Orange 61 and Pigment Blue 60.

8. The PET masterbatch for vehicle window side film according to claim 1 or 2, characterized in that: The processing aid is at least one of a dispersant, a lubricant, an antioxidant and a coupling agent; The dispersant is at least one of paraffin wax, polyethylene wax, montan wax and polyester wax; The lubricant is at least one of stearic acid amide, oleic acid amide, erucic acid amide, n-butyl stearate and glyceryl trihydroxystearate; The antioxidant is at least one of N,N-bis(n-octadecyl)hydroxylamine, N,N-dibenzylhydroxylamine and N-benzoylphenylhydroxylamine; The coupling agent is at least one of trimethylolpropane trimethacrylate, triallyl cyanurate and tert-butyl peroxycarbonate-2-ethylhexyl ester.

9. The method for preparing a PET masterbatch for a vehicle window side film according to any one of claims 1 to 8, characterized in that: The following steps are involved: The carrier, the first carbon black pigment, the second carbon black pigment, the non-carbon black dye and the processing aid are mixed evenly, and then put into a twin-screw extruder for extrusion granulation at 230-250° C. to obtain PET masterbatch; The main frequency of the twin-screw extruder is 10-30Hz.

10. Use of the PET masterbatch for vehicle window side films as described in any one of claims 1 to 8 in the preparation of vehicle window side films and non-window glass films.

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