Heat-deformation-resistant base film for self-adhesive label and preparation method of heat-deformation-resistant base film

Abstract

The invention relates to a heat-deformation-resistant base film for a self-adhesive label and a preparation method of the heat-deformation-resistant base film, and belongs to the technical field of high polymer materials. The heat-deformation-resistant base film is prepared from the following components in parts by weight: 100 parts of modified polyester resin, 4.2 to 5.5 parts of a plasticizer, 0.8 to 1.1 parts of an anti-sticking agent, 0.4 to 0.5 part of an antistatic agent, 0.25 to 0.3 part of an antioxidant and 0.1 to 0.13 part of a light stabilizer, according to the modified polyester resin, methyl thioglycolate and 2-aminoethanol are subjected to an amine ester exchange reaction to prepare a modifier, then the modifier and a vinyl structure of vinyl-POSS are subjected to click addition to prepare a modified monomer with multiple hydroxyl groups, finally, the modified monomer, ethylene glycol and terephthalic acid are copolymerized, and the copolymer is applied to a film-forming base material of a self-adhesive label. The adhesive label has good thermal deformation resistance, and the adhesive label can keep a stable structure at a high temperature.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer materials, and specifically relates to a heat-resistant deformation base film for self-adhesive labels and a preparation method thereof. Background Art

[0002] Self-adhesive labels, also known as self-sticking labels, instant stickers, pressure-sensitive papers, etc., are composite materials with paper, film or special materials as the fabric, an adhesive coated on the back, and a silicone-coated base paper as the protective paper. When using this kind of label, it only needs to be peeled off from the base paper and gently pressed to stick to the surface of various substrates, or a labeling machine can be used for automatic labeling on the production line.

[0003] Traditional paper self-adhesive labels have good printability and low cost. However, they have low label strength, poor water resistance, and the printed content is prone to loss, and they are gradually being replaced by polymer film-based labels; currently, the commonly used film materials for self-adhesive labels include: polyvinyl chloride, polypropylene, polyester, etc. Among them, polyester film materials have high mechanical strength, good chemical resistance, and good transparency, meeting the aesthetic requirements of transparent labels and becoming the most commonly used film materials for self-adhesive labels; however, although the melting points of these polymer materials are high, their heat resistance to deformation is poor, resulting in label deformation and warping, and even detachment, seriously affecting the identification function of the label. Summary of the Invention

[0004] In order to solve the technical problems mentioned in the background art, the purpose of the present invention is to provide a heat-resistant deformation base film for self-adhesive labels and a preparation method thereof.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A heat-resistant deformation base film for self-adhesive labels, comprising the following raw materials in parts by weight:

[0007] 100 parts of modified polyester resin, 4.2 - 5.5 parts of plasticizer, 0.8 - 1.1 parts of anti-sticking agent, 0.4 - 0.5 parts of antistatic agent, 0.25 - 0.3 parts of antioxidant, and 0.1 - 0.13 parts of light stabilizer;

[0008] The modified polyester resin is prepared by the following method:

[0009] Step A1: Premix methyl thioglycolate, 2-aminoethanol and toluene, introduce nitrogen protection, add diazabicyclo and mix well, then heat up to 80 - 100 °C and stir for 4 - 5 h. After the reaction, toluene is removed by reduced pressure distillation. After the substrate is cooled, it is washed with water and mixed, and then separated by liquid separation and dried in vacuum to obtain a modifier;

[0010] Further, the feeding ratio of methyl thioglycolate, 2-aminoethanol, diazabicyclo and toluene is 0.1 mol: 0.12 - 0.13 mol: 0.15 - 0.2 g: 60 - 80 mL. Diazabicyclo is an organic base catalyst that promotes the aminolysis reaction between methyl thioglycolate and 2-aminoethanol.

[0011] Step A2: Premix vinyl-POSS and tetrahydrofuran under the protection of dry gas, then add the modifier and photoinitiator 1173 and mix well. Heat up to 40 - 55 °C, apply 120 - 160 W / m 2 Ultraviolet irradiation, stir and react for 8 - 10 h. After the reaction, distill off tetrahydrofuran to obtain the modified monomer;

[0012] Further, the feeding ratio of vinyl-POSS, modifier, photoinitiator 1173 and tetrahydrofuran is 10 mmol: 80 mmol: 45 - 60 mg: 110 - 150 mL. Under ultraviolet light initiation, the terminal thiol group of the modifier undergoes a click addition grafting reaction with the vinyl structure of vinyl-POSS.

[0013] Step A3: Mix the modified monomer and dimethylacetamide, then add terephthalic acid, ethylene glycol and tetrabutyl titanate and mix. Pass in nitrogen for protection, control the temperature at 190 - 220 °C and the pressure at 0.2 - 0.25 MPa, carry out the esterification reaction for 3.8 - 4.6 h. Then add germanium dioxide, reduce the pressure to 100 Pa, continue to heat up to 260 - 280 °C and carry out polycondensation for 0.9 - 1.3 h. Discharge, cool and pelletize to obtain the modified polyester resin;

[0014] Further, the feeding ratio of terephthalic acid, ethylene glycol, modified monomer, tetrabutyl titanate, germanium dioxide and dimethylacetamide is 0.1 mmol: 70 - 90 mmol: 10 - 15 mmol: 8 - 11 mg: 6 - 10 mg: 20 - 30 mL. The modified monomer, ethylene glycol and terephthalic acid copolymerize to form a ternary block copolymer.

[0015] Preferably, the plasticizer is selected from glyceride compounds, which can efficiently plasticize the modified polyester resin matrix, is not easy to migrate under the action of heat, is beneficial to the film material to maintain uniform mechanical properties, and reduces the deformation caused by the swelling and contraction between phases in the blend system.

[0016] A preparation method of a heat-resistant deformation base film for self-adhesive labels is as follows: Mix the raw materials, and use twin-screw extrusion plasticization extrusion, calendering film formation and cooling annealing to obtain the heat-resistant deformation base film.

[0017] Further, the temperature parameters of the barrel of the twin-screw extruder during the plasticizing extrusion process are as follows: Zone 1: 240 - 250 °C, Zone 2: 250 - 260 °C, Zone 3: 260 - 270 °C, Zone 4: 260 - 270 °C, Zone 5: 260 - 270 °C, Zone 6: 250 - 260 °C.

[0018] Further, the annealing temperature is 60 - 70 °C and the time is 10 - 15 min.

[0019] Advantages of the present invention:

[0020] Based on copolyester technology, the present invention discloses a modified polyester resin, which is applied to the film-forming substrate of self-adhesive labels and has good heat distortion resistance, meeting the requirement that the self-adhesive label maintains structural stability at a relatively high temperature. The modified polyester resin is prepared by an aminolysis reaction of methyl thioglycolate and 2-aminoethanol to form a modifier, and then the modifier undergoes a click addition reaction with the vinyl structure of vinyl-POSS to form a modified monomer with multiple hydroxyl groups. Finally, the modified monomer is copolymerized with ethylene glycol and terephthalic acid. Compared with traditional polyester resins, the modified monomer introduces a cage-shaped silicon structure into the main chain of the polyester macromolecule, which restricts the movement of the polyester chain segments under thermal action. Its amide structure containing thioether acts as a strong hydrogen donor and forms hydrogen bond interactions with the ester structures in adjacent chains, further strengthening the intermolecular interactions of the macromolecular chains, thereby effectively improving the heat distortion resistance of the polymer. In addition, the amide structure of thioether is distributed on the outer side of the cage-shaped silicon, modifying its surface and enhancing the polarity of the cage-shaped silicon, compensating for the defect of decreased ink adhesion caused by the introduction of organosilicon, and enabling the prepared base film to have good printability and printing stability. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0022] Example 1: Preparation of a heat-resistant and deformation-resistant base film for self-adhesive labels is as follows:

[0023] (1) Preparation of the modified polyester resin

[0024] Step A1: premix methyl thioglycolate, 2-aminoethanol and toluene, pass nitrogen protection, add diazabicyclo and mix well, heat to 80°C, and stir at 60rpm for 5h, wherein the feed ratio of methyl thioglycolate, 2-aminoethanol, diazabicyclo and toluene is 0.1mol:0.12mol:0.15g:60mL. After the reaction is completed, toluene is evaporated under reduced pressure, the substrate is cooled and washed with water, separated and vacuum dried to obtain a modifier.

[0025] Step A2: Premix vinyl-POSS and tetrahydrofuran under dry air protection, then add modifier and photoinitiator 1173 and mix well, heat to 40°C, apply 120W / m 2 The reaction was carried out under ultraviolet irradiation and stirring at 30 rpm for 10 hours, wherein the feed ratio of vinyl-POSS, modifier, photoinitiator 1173 and tetrahydrofuran was 10 mmol: 80 mmol: 45 mg: 110 mL. After the reaction was completed, tetrahydrofuran was evaporated to obtain a modified monomer.

[0026] Step A3: Take the modified monomer and dimethylacetamide and mix them, then mix terephthalic acid, ethylene glycol and tetrabutyl titanate, introduce nitrogen protection, control the temperature to 190°C, the pressure to 0.2MPa, and the esterification reaction is 4.6h, then add germanium dioxide, reduce the pressure to 100Pa, and continue to heat to 260°C for condensation for 1.3h, wherein the feed ratio of terephthalic acid, ethylene glycol, modified monomer, tetrabutyl titanate, germanium dioxide and dimethylacetamide is 0.1mmol:90mmol:10mmol:8mg:6mg:20mL, finally the material is cooled and pelletized to obtain a modified polyester resin.

[0027] (2) Preparation of heat-resistant deformation base film

[0028] The raw materials are taken by weight: 100 parts of modified polyester resin, which is prepared in this embodiment; 4.2 parts of plasticizer, which is selected from industrial grade glyceryl tricaprylate; 1.1 parts of anti-adhesive agent, which is selected from KJ-H120 silicone masterbatch; 0.5 parts of antistatic agent, which is selected from LQX-30 antistatic agent; 0.25 parts of antioxidant, which is compounded by antioxidant 1010 and antioxidant 168 in equal weight ratio; 0.13 parts of light stabilizer, which is selected from light stabilizer 770;

[0029] The above raw materials were added into a high-speed mixer and mixed at 1200 rpm for 10 min, and then sent to a twin-screw extruder. The barrel temperature parameters were controlled to be set as follows: 240°C for zone 1, 250°C for zone 2, 260°C for zone 3, 260°C for zone 4, 260°C for zone 5, and 250°C for zone 6. The plasticized material was extruded into a calender for calendering and film forming. After cooling and forming, it was sent to a tunnel annealing furnace, the temperature was controlled at 60°C, and annealing treatment was performed for 15 min to obtain a heat-resistant deformation base film.

[0030] Example 2, preparing a heat-resistant deformation base film for a self-adhesive label, specifically as follows:

[0031] (1) Preparation of modified polyester resin

[0032] Step A1: premix methyl thioglycolate, 2-aminoethanol and toluene, pass nitrogen protection, add diazabicyclo and mix well, heat to 100°C, and stir at 90rpm for 4h, wherein the feed ratio of methyl thioglycolate, 2-aminoethanol, diazabicyclo and toluene is 0.1mol:0.13mol:0.2g:80mL. After the reaction, toluene is evaporated under reduced pressure, the substrate is cooled and washed with water, separated and vacuum dried to obtain a modifier.

[0033] Step A2: Premix vinyl-POSS and tetrahydrofuran under dry air protection, then add modifier and photoinitiator 1173 and mix well, raise the temperature to 40-55°C, and apply 160W / m 2 The reaction was carried out under ultraviolet irradiation and stirring at 50 rpm for 8 hours, wherein the feed ratio of vinyl-POSS, modifier, photoinitiator 1173 and tetrahydrofuran was 10 mmol: 80 mmol: 60 mg: 150 mL. After the reaction was completed, tetrahydrofuran was evaporated to obtain a modified monomer.

[0034] Step A3: Take the modified monomer and dimethylacetamide and mix them, then mix terephthalic acid, ethylene glycol and tetrabutyl titanate, introduce nitrogen protection, control the temperature to 220°C, the pressure to 0.25MPa, and the esterification reaction is 3.8h, then add germanium dioxide, reduce the pressure to 100Pa, and continue to heat to 280°C for condensation for 0.9h, wherein the feed ratio of terephthalic acid, ethylene glycol, modified monomer, tetrabutyl titanate, germanium dioxide and dimethylacetamide is 0.1mmol:70mmol:15mmol:11mg:10mg:30mL, and finally the material is cooled and pelletized to obtain a modified polyester resin.

[0035] (2) Preparation of heat-resistant deformation base film

[0036] The raw materials are taken according to weight parts, 100 parts of modified polyester resin, which is prepared by this embodiment; 5.5 parts of plasticizer, which is selected from industrial grade glyceryl tricaprylate; 0.8 parts of anti-adhesive agent, which is selected from KJ-H120 silicone masterbatch; 0.4 parts of antistatic agent, which is selected from LQX-30 antistatic agent; 0.3 parts of antioxidant, which is compounded by antioxidant 1010 and antioxidant 168 in equal weight ratio; 0.1 parts of light stabilizer, which is selected from light stabilizer 770;

[0037] Add the above raw materials to a high-speed mixer and mix at 1200 rpm for 10 min, then feed them into a twin-screw extruder. Set the barrel temperature parameters as follows: zone 1 at 250 °C, zone 2 at 260 °C, zone 3 at 270 °C, zone 4 at 270 °C, zone 5 at 270 °C, zone 6 at 260 °C. Extrude the plasticized material into a calender for film calendering. After cooling and forming, send it into a tunnel annealing furnace, control the temperature at 70 °C, and perform annealing treatment for 10 min to obtain a heat-resistant deformation base film.

[0038] Example 3: Preparation of a heat-resistant deformation base film for self-adhesive labels, specifically as follows:

[0039] (1) Preparation of modified polyester resin

[0040] Step A1: Premix methyl thioglycolate, 2-aminoethanol, and toluene, introduce nitrogen for protection, add diazabicyclo and mix well, heat up to 90 °C, apply stirring at 90 rpm and react for 4.5 h. Among them, the feeding ratio of methyl thioglycolate, 2-aminoethanol, diazabicyclo, and toluene is 0.1 mol: 0.12 mol: 0.18 g: 70 mL. After the reaction, distill off toluene under reduced pressure. After the substrate cools, wash it with water and mix, separate by liquid separation, and dry it under vacuum to obtain a modifier.

[0041] Step A2: Premix vinyl-POSS and tetrahydrofuran under the protection of dry air, then add the modifier and photoinitiator 1173 and mix well. Heat up to 50 °C, apply ultraviolet irradiation at 140 W / m 2 and stir at 30 rpm for 9 h. Among them, the feeding ratio of vinyl-POSS, modifier, photoinitiator 1173, and tetrahydrofuran is 10 mmol: 80 mmol: 50 mg: 130 mL. After the reaction, distill off tetrahydrofuran to obtain a modified monomer.

[0042] Step A3: Dissolve the modified monomer and dimethylacetamide, mix terephthalic acid, ethylene glycol, and tetrabutyl titanate, introduce nitrogen for protection, control the temperature at 210 °C, the pressure at 0.23 MPa, and perform esterification reaction for 4.2 h. Then add germanium dioxide, reduce the pressure to 100 Pa, continue to heat up to 270 °C and carry out polycondensation for 1.1 h. Among them, the feeding ratio of terephthalic acid, ethylene glycol, modified monomer, tetrabutyl titanate, germanium dioxide, and dimethylacetamide is 0.1 mmol: 80 mmol: 12 mmol: 10 mg: 7 mg: 25 mL. Finally, discharge, cool, and pelletize to obtain a modified polyester resin.

[0043] (2) Preparation of heat-resistant deformation base film

[0044] Take raw materials by weight parts: 100 parts of modified polyester resin, prepared by this example; 4.8 parts of plasticizer, selected from industrial grade glyceryl trioctanoate; 0.9 part of anti-sticking agent, selected from KJ-H120 silicone masterbatch; 0.4 part of antistatic agent, selected from LQX-30 antistatic agent; 0.28 part of antioxidant, compounded by antioxidant 1010 and antioxidant 168 in equal weight ratio; 0.11 part of light stabilizer, selected from light stabilizer 770.

[0045] Add the above raw materials into a high-speed mixer and mix at 1200 rpm for 10 min, then feed them into a twin-screw extruder. Control the barrel temperature parameters as follows: zone 1 at 250 °C, zone 2 at 250 °C, zone 3 at 260 °C, zone 4 at 270 °C, zone 5 at 270 °C, zone 6 at 260 °C. Extrude the plasticized material into a calender for calendering and film making. After cooling and forming, send it into a tunnel annealing furnace, control the temperature at 60 °C, and anneal for 15 min to obtain a heat-resistant deformation base film.

[0046] Example 4, preparation of a heat-resistant deformation base film for self-adhesive labels, is as follows:

[0047] (1) Preparation of modified polyester resin

[0048] Step A1: Premix methyl mercaptoacetate, 2-aminoethanol and toluene, introduce nitrogen protection, add diazabicyclo and mix well, heat up to 85 °C, apply stirring at 90 rpm and react for 4.6 h. Among them, the feeding ratio of methyl mercaptoacetate, 2-aminoethanol, diazabicyclo and toluene is 0.1 mol: 0.13 mol: 0.2 g: 75 mL. After the reaction, distill off toluene under reduced pressure. After the substrate cools, wash it with water and mix, separate by liquid separation and dry under vacuum to obtain a modifier.

[0049] Step A2: Premix vinyl-POSS and tetrahydrofuran under dry air protection, then add the modifier and photoinitiator 1173 and mix well. Heat up to 45 °C, apply ultraviolet irradiation at 150 W / m 2 and stir at 50 rpm for 9.5 h. Among them, the feeding ratio of vinyl-POSS, modifier, photoinitiator 1173 and tetrahydrofuran is 10 mmol: 80 mmol: 50 mg: 120 mL. After the reaction, distill off tetrahydrofuran to obtain a modified monomer.

[0050] Step A3: Mix the modified monomer and dimethylacetamide. Then mix terephthalic acid, ethylene glycol, and tetrabutyl titanate, introduce nitrogen for protection, control the temperature at 210°C and the pressure at 0.23 MPa, carry out the esterification reaction for 4 h. Then add germanium dioxide, reduce the pressure to 100 Pa, and continue to raise the temperature to 280°C for polycondensation for 1 h. Among them, the feeding ratio of terephthalic acid, ethylene glycol, modified monomer, tetrabutyl titanate, germanium dioxide, and dimethylacetamide is 0.1 mmol: 80 mmol: 15 mmol: 10 mg: 8 mg: 30 mL. Finally, discharge, cool, and pelletize to obtain the modified polyester resin.

[0051] (2) Preparation of heat-resistant deformation base film

[0052] Take raw materials by weight. 100 parts of modified polyester resin, self-made in this example; 5.2 parts of plasticizer, selected from industrial grade triglyceride caprylate; 1 part of anti-sticking agent, selected from KJ-H120 type silicone masterbatch; 0.4 part of antistatic agent, selected from LQX-30 type antistatic agent; 0.3 part of antioxidant, compounded by antioxidant 1010 and antioxidant 168 in equal weight ratio; 0.12 part of light stabilizer, selected from light stabilizer 770;

[0053] Add the above raw materials to a high-speed mixer and mix at 1200 rpm for 10 min, then feed them into a twin-screw extruder. Control the barrel temperature parameters as follows: zone 1 at 240°C, zone 2 at 250°C, zone 3 at 260°C, zone 4 at 260°C, zone 5 at 270°C, zone 6 at 260°C. Extrude the plasticized material into a calender for film calendering. After cooling and forming, send it into a tunnel annealing furnace, control the temperature at 70°C, and carry out annealing treatment for 12 min to obtain the heat-resistant deformation base film.

[0054] Comparative Example 1. This comparative example refers to Example 4, and polyester resin is prepared without adding modified monomer for copolymerization. The rest of the implementation process is exactly the same. The preparation method of polyester resin is as follows: Mix terephthalic acid, ethylene glycol, tetrabutyl titanate, and dimethylacetamide, introduce nitrogen for protection, control the temperature at 190°C and the pressure at 0.2 MPa, carry out the esterification reaction for 3.5 h. Then add germanium dioxide, reduce the pressure to 100 Pa, and continue to raise the temperature to 270°C for polycondensation for 0.7 h. Among them, the feeding ratio of terephthalic acid, ethylene glycol, tetrabutyl titanate, germanium dioxide, and dimethylacetamide is 0.1 mmol: 0.12 mol: 15 mg: 8 mg: 15 mL. Finally, discharge, cool, and pelletize to obtain polyester resin.

[0055] Comparative Example 2. This comparative example refers to Example 4, uses mercaptoethanol to replace the modifier to modify vinyl-POSS, and copolymerizes it to prepare modified polyester resin. The rest of the implementation process is exactly the same as Example 4. Specifically as follows:

[0056] Step D1: Vinyl-POSS and tetrahydrofuran are premixed under the protection of dry air, then mercaptoethanol and photoinitiator 1173 are added and mixed evenly. The temperature is raised to 50 °C, and ultraviolet irradiation and stirring at 60 rpm are carried out for 9 h. Among them, the feeding ratio of vinyl-POSS, mercaptoethanol, photoinitiator 1173 and tetrahydrofuran is 10 mmol: 80 mmol: 50 mg: 120 mL. After the reaction, tetrahydrofuran is distilled off to obtain a modified monomer. 2 The reaction of ultraviolet irradiation and 60 rpm stirring lasts for 9 h. Among them, the feeding ratio of vinyl-POSS, mercaptoethanol, photoinitiator 1173 and tetrahydrofuran is 10 mmol: 80 mmol: 50 mg: 120 mL. After the reaction, tetrahydrofuran is distilled off to obtain a modified monomer.

[0057] Step D2: The modified monomer and dimethylacetamide are mixed and dissolved, and then terephthalic acid, ethylene glycol and tetrabutyl titanate are mixed. Nitrogen protection is introduced, the temperature is controlled at 200 °C, the pressure is 0.25 MPa, and the esterification reaction is carried out for 4.5 h. Then germanium dioxide is added, the pressure is reduced to 100 Pa, and the temperature is further raised to 260 °C for polycondensation for 1 h. Among them, the feeding ratio of terephthalic acid, ethylene glycol, modified monomer, tetrabutyl titanate, germanium dioxide and dimethylacetamide is 0.1 mmol: 80 mmol: 15 mmol: 9 mg: 8 mg: 30 mL. Finally, the product is discharged, cooled and pelletized to obtain a modified polyester resin.

[0058] Samples are taken from the film materials prepared as above, and the following tests are carried out on the samples:

[0059] Transmittance test: Refer to the standard of GB / T 2410-2008;

[0060] Heat distortion temperature test: Refer to the standard of GB / T 1634.2-2019;

[0061] Heat warping test: The sample is placed in an oven and baked continuously at a temperature of 70 °C for 96 h, and the dimensional shrinkage rate and the maximum arc height of the sample are detected;

[0062] Printing test: A circular mark is printed on the surface of the sample with water-based black label ink, a cashmere felt is soaked in water and wiped back and forth 50 times, and a color difference meter is used to detect the color difference before and after wiping;

[0063] The specific test results are shown in Table 1:

[0064] Table 1

[0065]

[0066]

[0067] It can be seen from the test results in Table 1 that the transmittance of the base film prepared in the example is slightly lower, but it still remains above 80%, meeting the aesthetic requirements of the label. It has a high heat distortion temperature, low dimensional shrinkage rate and maximum arc height, has good heat distortion resistance, and has a high printing bonding strength, meeting the printing requirements of the label.

[0068] In the description of the specification, the description referring to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0069] The above content is only an example and illustration of the present invention. Those skilled in the art of the present technology can make various modifications or supplements to the described specific embodiments or use similar ways to replace them. As long as they do not deviate from the invention or exceed the scope defined by the claims of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A heat-resistant deformation base film for a self-adhesive label, characterized in that: The composition comprises, by weight: 100 parts of modified polyester resin, 4.2-5.5 parts of plasticizer, 0.8-1.1 parts of anti-adhesive agent, 0.4-0.5 parts of antistatic agent, 0.25-0.3 parts of antioxidant and 0.1-0.13 parts of light stabilizer; The modified polyester resin is prepared by the following method: Step A1: premix methyl thioglycolate, 2-aminoethanol and toluene, introduce nitrogen protection, add diazabicyclic, mix well and heat to 80-100° C., stir and react for 4-5 hours to obtain a modifier; Step A2: premix vinyl-POSS and tetrahydrofuran under dry gas protection, then add modifier and photoinitiator 1173 and mix well, raise the temperature to 40-55°C, apply 120-160W / m 2 UV irradiation, stirring and reacting for 8-10 hours to obtain a modified monomer; Step A3: Mix the modified monomer and dimethylacetamide, then add terephthalic acid, ethylene glycol and tetrabutyl titanate, mix, introduce nitrogen protection, control the temperature to 190-220°C, the pressure to 0.2-0.25MPa, and esterify for 3.8-4.6h, then add germanium dioxide, reduce the pressure to 100Pa, continue to heat to 260-280°C for condensation for 0.9-1.3h, cool the material, and pelletize to obtain a modified polyester resin.

2. The heat-resistant deformation base film for a self-adhesive label according to claim 1, characterized in that: The feed ratio of methyl thioglycolate, 2-aminoethanol, diazabicyclo and toluene is 0.1 mol: 0.12-0.13 mol: 0.15-0.2 g: 60-80 mL.

3. The heat-resistant deformation base film for a self-adhesive label according to claim 2, characterized in that: The feed ratio of vinyl-POSS, modifier, photoinitiator 1173 and tetrahydrofuran is 10 mmol: 80 mmol: 45-60 mg: 110-150 mL.

4. The heat-resistant deformation base film for a self-adhesive label according to claim 3, characterized in that: The feed ratio of terephthalic acid, ethylene glycol, modified monomer, tetrabutyl titanate, germanium dioxide and dimethylacetamide is 0.1mmol:70-90mmol:10-15mmol:8-11mg:6-10mg:20-30mL.

5. The heat-resistant deformation base film for a self-adhesive label according to claim 1, characterized in that: The plasticizer is a glyceride compound.

6. The method for preparing a heat-resistant deformation base film for a self-adhesive label according to any one of claims 1 to 5, characterized in that: Specifically, various raw materials are mixed, plasticized and extruded by twin-screw extrusion, calendered to form a film, and cooled and annealed to obtain a heat-resistant deformation base film.

7. The method for preparing a heat-resistant deformation base film for a self-adhesive label according to claim 6, characterized in that: The temperature parameters of the barrel of the twin-screw extruder during the plasticizing extrusion process are: zone one 240-250°C, zone two 250-260°C, zone three 260-270°C, zone four 260-270°C, zone five 260-270°C, zone six 250-260°C.

8. The method for preparing a heat-resistant deformation base film for a self-adhesive label according to claim 6, characterized in that: The annealing temperature is 60-70°C and the time is 10-15 minutes.

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