A calendered PETG smart card substrate and preparation method thereof

Abstract

The present invention relates to the technical field of polymer materials, and in particular to a calendered PETG smart card substrate and a preparation method thereof, comprising 100 parts of PETG resins, 6-12 parts of titanium dioxide, 0.3-1.2 parts of efficient lubricants, 0.1-0.5 parts of E waxes, 0.5-1 parts of antioxidants, 0.1-0.5 parts of ultraviolet absorbers and 0.1-0.5 parts of antistatic agents, by combining efficient lubricants with E waxes, ADD2 particles are replaced, and powder is more easily dispersed and uniform, and the special hyperbranched terminal hydroxyl structure of the efficient lubricant can be grafted with PETG to promote the motion of molecular chains, thereby playing an internal lubricating role, improving the plasticizing effect of PETG, and the grafted lubricant will not precipitate, so that the surface tension remains ≥37 dynes; by pre-mixing of powders such as lubricants, E waxes and titanium dioxide, the powder surface is activated, and the overall mixing uneven agglomeration problem is solved. The problem of plasticization, agglomeration and roller surface precipitation caused by the ADD2 particle auxiliary agent in the PETG smart card substrate is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, in particular to a calendered PETG smart card substrate and a preparation method thereof. Background Art

[0002] PETG (polyethylene terephthalate-1,4-cyclohexanedimethanol) is a non-crystalline copolyester. Its products are highly transparent and have excellent impact resistance. They are widely used in the market for plates, sheets, high-performance shrink films, bottles and special-shaped materials.

[0003] In recent years, due to environmental regulations, downstream card manufacturers have attempted to switch from oil-based solvent inks to water-based inks. This has placed higher demands on PETG surface quality and surface wetting tension. The existing standard surface tension of ≥35 dynes cannot meet these new printing requirements. Testing has revealed that a surface tension of ≥37 dynes is required. Currently, the production process for PETG smart card substrates primarily relies on calendaring. The main challenge with calendaring PETG is low production yields. According to internal statistics, the yield for 60-150μm films is 80%, while the yield for thick sheets over 330μm is only around 67%, severely impacting production efficiency. Classification revealed that defects primarily manifest in two areas: apparent impurities and substandard wetting tension. First, impurities are primarily caused by external contamination, powder agglomeration, and unplasticized material, particularly at thicknesses above 330μm. Second, white haze-like precipitates on the roller surface alter the surface roughness of the material, leading to substandard wetting tension (<35 dynes). After investigating the cause, we found that the main problem lies in the addition of ADD2 granular additive.

[0004] How to solve the problems of plasticization, agglomeration and roller surface precipitation caused by the addition of ADD2 is the focus and difficulty of PETG calendering production. Summary of the Invention

[0005] The present invention aims to provide a calendered PETG smart card substrate and a preparation method thereof, aiming to solve the problems of plasticization, agglomeration and roller surface precipitation caused by the ADD2 particle additive in the PETG smart card substrate.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a calendered PETG smart card substrate, comprising 100 parts of PETG resin, 6-12 parts of titanium dioxide, 0.3-1.2 parts of a high-efficiency lubricant, 0.1-0.5 parts of E wax, 0.5-1 parts of an antioxidant, 0.1-0.5 parts of an ultraviolet absorber, and 0.1-0.5 parts of an antistatic agent.

[0007] Wherein, the PETG resin is one or a combination of GS2, S2008, and K2012 milled materials;

[0008] The titanium dioxide is rutile titanium dioxide;

[0009] The high-efficiency lubricant is one or a combination of HyperC182 and HyperC182D.

[0010] The E wax is Clariant Licowax E;

[0011] The antioxidant is a combination of antioxidant 1010 and antioxidant 168;

[0012] The ultraviolet absorber is BASF T234;

[0013] The antistatic agent is nano antimony tin oxide.

[0014] In a second aspect, the present invention provides a method for preparing a calendered PETG smart card substrate, comprising the following steps:

[0015] Stirring titanium dioxide, antioxidant, ultraviolet absorber and antistatic agent at a first speed according to the proportion, adding high-efficiency lubricant and E wax while stirring, and after the addition is completed, stirring at a second speed for 5 minutes while controlling the temperature below 90° C. to obtain a first mixture;

[0016] The first mixture is stirred at the first speed, and the PETG resin is added while stirring. After the addition is completed, the mixture is stirred at the second speed for 10 minutes while controlling the temperature below 90° C. to obtain a second mixture;

[0017] The second mixture is cooled, extruded, calendered, drawn off and cooled to obtain a calendered PETG smart card substrate.

[0018] The method of cooling the second mixture, extruding, calendering, drawing off and cooling to obtain a calendered PETG smart card substrate comprises:

[0019] Cooling the second mixture and feeding it into a planetary extruder;

[0020] Extruding through the extruder of the planetary extruder to obtain an extrusion raw material;

[0021] The raw material is calendered by the calendering roller of the planetary extruder to obtain a calendered raw material;

[0022] The raw material is drawn off by the drawing-off roller of the calendering roller to obtain the drawn-off raw material;

[0023] The drawn raw material is cooled to obtain a calendered PETG smart card substrate.

[0024] Wherein, the temperature of the extruder is 150-200°C, the temperature of the calendering roller is 120-180°C, and the temperature of the take-off roller is 60-120°C.

[0025] The invention discloses a preparation method for a calendered PETG smart card substrate. The method comprises 100 parts of PETG resin, 6-12 parts of titanium dioxide, 0.3-1.2 parts of a high-efficiency lubricant, 0.1-0.5 parts of E-wax, 0.5-1 part of an antioxidant, 0.1-0.5 parts of an ultraviolet absorber, and 0.1-0.5 parts of an antistatic agent. The high-efficiency lubricant in powder form is used in combination with the E-wax to replace ADD2 particles added in a high amount, so that the powder is more easily and evenly dispersed. The special hyperbranched terminal hydroxyl structure of the high-efficiency lubricant can undergo a grafting reaction with the PETG, thereby promoting the movement of molecular chains and thus achieving internal lubrication, thereby improving the plasticizing effect of the PETG. The grafted lubricant will not precipitate, so that the surface tension is maintained at 37 dynes or higher. The addition of a trace amount of E-wax enables the PETG to have a better anti-sticking roller effect. The addition of the antistatic agent solves the problem of continuous printing. The premixing of the lubricant, the E-wax, the titanium dioxide and other powders activates the surface of the powder, thereby solving the problem of uneven mixing and agglomeration. The present invention provides a simple and easy preparation method, and the product meets the new needs of downstream water-based printing. It replaces the expensive imported ADD2 additive, saves costs, and significantly improves the product qualification rate. It has great application prospects in fields such as PETG documents and smart cards. It also solves the problems of plasticization, agglomeration, and roller surface precipitation caused by the ADD2 particle additive in the PETG smart card substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 The present invention provides a flow chart of a method for preparing a calendered PETG smart card substrate. DETAILED DESCRIPTION

[0028] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0029] In a first aspect, the present invention provides a calendered PETG smart card substrate, comprising 100 parts of PETG resin, 6-12 parts of titanium dioxide, 0.3-1.2 parts of a high-efficiency lubricant, 0.1-0.5 parts of E wax, 0.5-1 parts of an antioxidant, 0.1-0.5 parts of an ultraviolet absorber, and 0.1-0.5 parts of an antistatic agent.

[0030] Furthermore, the PETG resin is one or a combination of GS2, S2008, and K2012 milled materials;

[0031] The titanium dioxide is rutile titanium dioxide;

[0032] The high-efficiency lubricant is one or a combination of HyperC182 and HyperC182D.

[0033] The E wax is Clariant Licowax E;

[0034] The antioxidant is a combination of antioxidant 1010 and antioxidant 168;

[0035] The ultraviolet absorber is BASF T234;

[0036] The antistatic agent is nano antimony tin oxide.

[0037] Specifically, by combining a powdered high-efficiency lubricant with E-wax, replacing high-addition ADD2 particles, the powder is more easily dispersed and uniformly distributed. The high-efficiency lubricant's unique hyperbranched terminal hydroxyl structure can undergo a grafting reaction with PETG, promoting molecular chain motion and thus providing internal lubrication, enhancing the plasticization of PETG. The grafted lubricant prevents precipitation, maintaining a surface tension of ≥37 dynes. The addition of a trace amount of E-wax provides PETG with a better anti-stick roller effect. The addition of an antistatic agent solves the problem of continuous printing. Premixing the lubricant, E-wax, and powders such as titanium dioxide activates the powder surface, solving the problem of uneven mixing and agglomeration. The present invention provides a simple and easy preparation method, and the product meets the new needs of downstream water-based printing, replacing expensive imported ADD2 additives, saving costs, and significantly improving product qualification rates. It has great application prospects in fields such as PETG ID cards and smart cards. It solves the problems of plasticization, agglomeration, and roller precipitation caused by ADD2 particle additives in PETG smart card substrates.

[0038] See also Figure 1 In a second aspect, the present invention provides a method for preparing a calendered PETG smart card substrate, comprising the following steps:

[0039] S1: stirring titanium dioxide, antioxidant, ultraviolet absorber and antistatic agent according to the proportion at a first speed, adding high-efficiency lubricant and E wax while stirring, and after the addition is completed, stirring at a second speed for 5 minutes while controlling the temperature below 90° C. to obtain a first mixture;

[0040] Specifically, the titanium dioxide is 6-12 parts, the high-efficiency lubricant is 0.3-1.2 parts, the E wax is 0.1-0.5 parts, the antioxidant is 0.5-1 parts, the ultraviolet absorber is 0.1-0.5 parts and the antistatic agent is 0.1-0.5 parts.

[0041] S2: stirring the first mixture at the first speed, adding PETG resin while stirring, and after the addition is completed, stirring at the second speed for 10 minutes while controlling the temperature below 90° C. to obtain a second mixture;

[0042] Specifically, the PETG resin is 100 parts. The first rotation speed is low speed, and the stirring is performed in a low-speed stirring kettle during low-speed stirring, and the second rotation speed is high speed, and the stirring is performed in a high-speed stirring kettle during high-speed stirring.

[0043] S3 cools the second mixture, extrudes, calenders, draws off, and cools to obtain a calendered PETG smart card substrate.

[0044] Specifically, the second mixture in the high-speed stirring kettle is discharged from the low-speed stirring kettle, cooled, and then fed into a planetary extruder; extruded through the extruder of the planetary extruder to obtain an extrusion raw material; calendered through the calendering rollers of the planetary extruder to obtain a calendered raw material; desorbed through the desorbing rollers of the calendering rollers to obtain a desorbed raw material; and the desorbed raw material is cooled to obtain a calendered PETG smart card substrate. The temperature of the extruder is 150-200° C., the temperature of the calendering rollers is 120-180° C., and the temperature of the desorbing rollers is 60-120° C.

[0045] Example 1

[0046] Weigh the following raw materials according to the formula ratio:

[0047] 100 parts of GS2 resin;

[0048] 12 parts of rutile titanium dioxide;

[0049] HyperC182 1.2 parts;

[0050] Clariant Licowax E 0.1 part;

[0051] 0.5 parts of antioxidant 1010 / 168;

[0052] 0.5 parts of ultraviolet absorber T234;

[0053] 0.1 part of nano antimony tin oxide;

[0054] Follow these steps to prepare the membrane:

[0055] 1) Put titanium dioxide, antioxidant, UV absorber and nano tin oxide antimony agent into high-speed stirring according to the ratio, stir at low speed first, add high-efficiency lubricant and E wax while stirring, turn on high-speed stirring for 5 minutes after adding, control the temperature below 90°C, then add the main ingredient PETG powder with low-speed stirring, turn on high-speed stirring for 10 minutes, control the powder temperature below 90°C to prevent paste.

[0056] 2) The raw materials in the high-speed stirring kettle are discharged from the low-speed stirring kettle, and after cooling, they are fed into the planetary extruder, and a film of a certain thickness is obtained through extrusion, calendering, desorption, and cooling.

[0057] In step 2), the process temperatures of the extruder are 150°C, the calendering rollers are 1#: 180°C, 2#: 180°C, 3#: 170°C, 4#: 165°C, 5#: 120°C, and the temperatures of the take-off rollers are 1#: 120°C, 2#: 110°C, 3#: 100°C, 4#: 80°C, and 5#: 60°C.

[0058] Example 2

[0059] Weigh the following raw materials according to the formula ratio:

[0060] 100 parts of S2008 resin;

[0061] 6 parts of rutile titanium dioxide;

[0062] HyperC182D 1.2 parts;

[0063] Clariant Licowax E 0.5 parts;

[0064] 1 part of antioxidant 1010 / 168;

[0065] 0.5 parts of ultraviolet absorber T234;

[0066] 0.3 parts of nano antimony tin oxide;

[0067] Follow these steps to prepare the membrane:

[0068] 1) Put titanium dioxide, antioxidant, UV absorber and nano tin oxide antimony agent into high-speed stirring according to the ratio, stir at low speed first, add high-efficiency lubricant and E wax while stirring, turn on high-speed stirring for 5 minutes after adding, control the temperature below 90°C, then add the main ingredient PETG powder with low-speed stirring, turn on high-speed stirring for 10 minutes, control the powder temperature below 90°C to prevent paste.

[0069] 2) The raw materials in the high-speed stirring kettle are discharged from the low-speed stirring kettle, and after cooling, they are fed into the planetary extruder, and a film of a certain thickness is obtained through extrusion, calendering, desorption, and cooling.

[0070] In step 2), the process temperatures of the extruder are 200°C, the calendering rollers are 1#: 180°C, 2#: 180°C, 3#: 170°C, 4#: 165°C, 5#: 120°C, and the temperatures of the take-off rollers are 1#: 120°C, 2#: 110°C, 3#: 100°C, 4#: 80°C, and 5#: 60°C.

[0071] Example 3

[0072] Weigh the following raw materials according to the formula ratio:

[0073] 100 parts of K2012 resin;

[0074] 8 parts of rutile titanium dioxide;

[0075] HyperC182 0.3 parts;

[0076] Clariant Licowax E 0.5 parts;

[0077] 0.5 parts of antioxidant 1010 / 168;

[0078] 0.5 parts of ultraviolet absorber T234;

[0079] 0.5 parts of nano antimony tin oxide;

[0080] Follow these steps to prepare the membrane:

[0081] 1) Put titanium dioxide, antioxidant, UV absorber and nano tin oxide antimony agent into high-speed stirring according to the ratio, stir at low speed first, add high-efficiency lubricant and E wax while stirring, turn on high-speed stirring for 5 minutes after adding, control the temperature below 90°C, then add the main ingredient PETG powder with low-speed stirring, turn on high-speed stirring for 10 minutes, control the powder temperature below 90°C to prevent paste.

[0082] 2) The raw materials in the high-speed stirring kettle are discharged from the low-speed stirring kettle, and after cooling, they are fed into the planetary extruder, and a film of a certain thickness is obtained through extrusion, calendering, desorption, and cooling.

[0083] In step 2), the process temperatures of the extruder are 180°C, the calendering rollers are 1#: 180°C, 2#: 180°C, 3#: 170°C, 4#: 165°C, 5#: 120°C, and the temperatures of the take-off rollers are 1#: 120°C, 2#: 110°C, 3#: 100°C, 4#: 80°C, and 5#: 60°C.

[0084] Example 4

[0085] Weigh the following raw materials according to the formula ratio:

[0086] 100 parts of GS2 resin;

[0087] 12 parts of rutile titanium dioxide;

[0088] HyperC182D 1.2 parts;

[0089] Clariant Licowax E 0.5 parts;

[0090] 0.5 parts of antioxidant 1010 / 168;

[0091] 0.5 parts of ultraviolet absorber T234;

[0092] 0.1 part of nano antimony tin oxide;

[0093] Follow these steps to prepare the membrane:

[0094] 1) Put titanium dioxide, antioxidant, UV absorber and nano tin oxide antimony agent into high-speed stirring according to the ratio, stir at low speed first, add high-efficiency lubricant and E wax while stirring, turn on high-speed stirring for 5 minutes after adding, control the temperature below 90°C, then add the main ingredient PETG powder with low-speed stirring, turn on high-speed stirring for 10 minutes, control the powder temperature below 90°C to prevent paste.

[0095] 2) The raw materials in the high-speed stirring kettle are discharged from the low-speed stirring kettle, and after cooling, they are fed into the planetary extruder, and a film of a certain thickness is obtained through extrusion, calendering, desorption, and cooling.

[0096] In step 2), the process temperatures of the extruder are 180°C, the calendering rollers are 1#: 180°C, 2#: 180°C, 3#: 170°C, 4#: 165°C, 5#: 120°C, and the temperatures of the take-off rollers are 1#: 120°C, 2#: 110°C, 3#: 100°C, 4#: 80°C, and 5#: 60°C.

[0097] Production was implemented according to the technical routes of patents CN1594430A and CN1712211A, and performance tests were conducted on the products compared with those of Examples 1-4. The comparison revealed that the number of impurities in the examples was significantly reduced, indicating that the plasticization and agglomeration of impurities in the examples were reduced while eliminating external pollution. The addition of high-efficiency lubricants and E-wax achieved effective dispersion and internal lubrication. The addition of nano-antimony tin oxide effectively reduced the volume resistivity of the material. After 72 hours of continuous production, it can be seen that Examples 1-4 still maintained no roller surface precipitation, and the products maintained high wetting tension (≥37) and surface roughness, with significantly improved product printing performance. In summary, the use of high-efficiency lubricants and E-wax instead of ADD2 additives has obvious performance advantages.

[0098] Table 1 PETG performance test

[0099]

[0100] Note: Surface tension and surface roughness are the average test results after 72 hours of continuous production.

[0101] The present invention utilizes a powdered high-efficiency lubricant in combination with E-wax, replacing high-addition amounts of ADD2 particles. This allows for easier and more uniform powder dispersion. The high-efficiency lubricant's unique hyperbranched terminal hydroxyl structure can undergo a grafting reaction with PETG, promoting molecular chain motion and thus providing internal lubrication, enhancing the plasticization of PETG. The grafted lubricant prevents precipitation, maintaining a surface tension of ≥37 dynes. The addition of a trace amount of E-wax provides PETG with improved roller-resistance. The addition of an antistatic agent solves the problem of continuous printing. Premixing the lubricant, E-wax, and powders such as titanium dioxide activates the powder surface, addressing the problem of uneven mixing and agglomeration. The present invention provides a simple and easy preparation method, and the product meets the new demands of downstream water-based printing. It replaces expensive imported ADD2 additives, saving costs and significantly improving product qualification rates. It has great application prospects in fields such as PETG ID cards and smart cards. It solves the problems of plasticization, agglomeration, and roller-surface precipitation caused by ADD2 particle additives in PETG smart card substrates.

[0102] The above disclosure is merely a preferred embodiment of a calendered PETG smart card substrate and a method for preparing the same, and is certainly not intended to limit the scope of the present invention. A person skilled in the art will appreciate that any equivalent variations made by implementing all or part of the above embodiments in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A calendered PETG smart card substrate, characterized in that: Including 100 parts of PETG resin, 6-12 parts of titanium dioxide, 0.3-1.2 parts of high-efficiency lubricant, 0.1-0.5 parts of E wax, 0.5-1 parts of antioxidant, 0.1-0.5 parts of ultraviolet absorber and 0.1-0.5 parts of antistatic agent; Wherein, the PETG resin is one or a combination of GS2, S2008, and K2012 milled materials; The titanium dioxide is rutile titanium dioxide; The high-efficiency lubricant is one or a combination of HyperC182 and HyperC182D; The E wax is Clariant Licowax E; The antioxidant is a combination of antioxidant 1010 and antioxidant 168; The ultraviolet absorber is BASF T234; The antistatic agent is nano antimony tin oxide.

2. A method for preparing a calendered PETG smart card substrate, for preparing the calendered PETG smart card substrate according to claim 1, characterized in that: The following steps are involved: Stirring titanium dioxide, antioxidant, ultraviolet absorber and antistatic agent at a first speed according to the proportion, adding high-efficiency lubricant and E wax while stirring, and after the addition is completed, stirring at a second speed for 5 minutes while controlling the temperature below 90° C. to obtain a first mixture; The first mixture is stirred at the first speed, and the PETG resin is added while stirring. After the addition is completed, the mixture is stirred at the second speed for 10 minutes while controlling the temperature below 90° C. to obtain a second mixture; The second mixture is cooled, extruded, calendered, drawn off and cooled to obtain a calendered PETG smart card substrate.

3. The method for preparing a calendered PETG smart card substrate as claimed in claim 2, wherein: The method comprises: cooling the second mixture, extruding, calendering, drawing off and cooling to obtain a calendered PETG smart card substrate. Cooling the second mixture and feeding it into a planetary extruder; Extruding through the extruder of the planetary extruder to obtain an extrusion raw material; The raw material is calendered by the calendering roller of the planetary extruder to obtain a calendered raw material; The raw material is drawn off by the drawing-off roller of the calendering roller to obtain the drawn-off raw material; The drawn raw material is cooled to obtain a calendered PETG smart card substrate.

4. The method for preparing a calendered PETG smart card substrate as claimed in claim 3, wherein: The temperature of the extruder is 150-200°C, the temperature of the calendering roller is 120-180°C, and the temperature of the take-off roller is 60-120°C.

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