Highly wear-resistant and deformation-resistant PETG composite board and preparation method therefor

Abstract

The present application relates to the technical field of boards and specifically to a highly wear-resistant and deformation-resistant PETG composite board and a preparation method therefor. The highly wear-resistant and deformation-resistant PETG composite board of the present application comprises the following components in parts by weight: 30-50 parts of PET, 10-20 parts of modified PETG, 40-50 parts of nano calcium carbonate, 1-3 parts of a toughening agent, 0.5-1 part of an antioxidant, 1-2 parts of a lubricant, 1-1.5 parts of a chain extender, 0.5-1 part of polyamide, and 8-12 parts of a flame retardant. The highly wear-resistant and deformation-resistant PETG composite board has good wear resistance, impact resistance, waterproofness, and tensile properties and exhibits excellent deformation resistance, laying a solid foundation for the wide application of the PETG board.

Description

High-wear-resistance and deformation-resistant PETG composite board and preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of board, and particularly relates to a high-wear-resistance and deformation-resistant PETG composite board and a preparation method thereof. BACKGROUND

[0002] PETG is a semi-crystalline plastic, which is copolymerized by terephthalic acid and ethylene glycol. Compared with traditional PET, PETG has higher toughness, transparency, impact resistance and chemical corrosion resistance. PETG is a transparent or translucent polymer material, which can be processed into products of different shapes and sizes through injection molding, blow molding, extrusion and other ways, and can be widely applied to consumer goods, medical treatment, construction, decoration, office, packaging and other industries, and has wide development and application prospect. However, with the continuous change of the use environment and the widening, the requirements for PETG materials are getting higher and higher.

[0003] At present, the enhancement of PETG mainly includes inorganic particle enhancement and polymer blending enhancement. Patent CN202110073157.7 discloses a weather-resistant and corrosion-resistant PETG board and a preparation method thereof. The application provides a new weather-resistant and corrosion-resistant PETG board. The PETG board adopts special process and raw materials, and the obtained PETG board has good comprehensive performance, especially excellent weather-resistant and corrosion-resistant performance, and has significant advantages. Patent CN201510151877.5 discloses a high-weather-resistant solar cell backboard material and a preparation method thereof. The solar backboard material obtained by the method has good and reliable electrical insulation performance, oxygen barrier performance, water barrier performance and aging resistance, and shows excellent weather resistance and can withstand various severe weather conditions. The preparation process of the application is simple, the cost is low, and the service life of the solar cell can be effectively prolonged. However, in the actual use process of the board, the board is often scrapped due to the deformation of some raw materials, which greatly reduces the service life of the PETG board. SUMMARY

[0004] The present application provides a high-wear-resistance and deformation-resistant PETG composite board and a preparation method thereof, so as to provide a PETG board with good deformation resistance and wear resistance.

[0005] The present application provides a high-wear-resistance and deformation-resistant PETG composite board, which comprises the following components in parts by weight: PET 30-50 parts, modified PETG 10-20 parts, nano calcium carbonate 40-50 parts, toughening agent 1-3 parts, antioxidant 0.5-1 part, lubricant 1-2 parts, chain extender 1-1.5 parts, polyamide 0.5-1 part and flame retardant 8-12 parts.

[0006] The preparation steps of the modified PETG are as follows:

[0007] S1: mixing recycled PET with ethylene glycol, then adding potassium carbonate, reacting at 190-210℃ for 2-4h, filtering, mixing the filtered product with methanol, adding potassium carbonate, reacting at 60-70℃ for 3-4h, filtering, centrifuging, and distilling to obtain regenerated DMT;

[0008] S2: mixing deionized water, 6-amino-1-hexanol, and dimethyl terephthalate under a nitrogen atmosphere, reacting at 120-220℃ for 3-5h to obtain an amide diol;

[0009] S3: heating and melting 1,4-cyclohexane dimethanol, then mixing it with regenerated DMT, ethylene glycol, 2,6-pyridine dimethanol, amide diol, and ester exchange catalyst, stirring uniformly, then reacting at 160-200℃ for 2-3h to obtain a prepolymer, then adding a polycondensation catalyst and a stabilizer to the reaction system, and reacting at 40-50Pa and 260-290℃ for 1-1.5h to obtain the modified PETG.

[0010] Preferably, the toughening agent is any one of polypropylene grafted maleic anhydride, TPU, TPE, SEBS, EEA, or rubber powder.

[0011] Preferably, the antioxidant is any one of antioxidant 1010 or antioxidant 168.

[0012] Preferably, the lubricant is any one of OPE wax, amide wax, low-molecular polyethylene wax, or EBS.

[0013] Preferably, the chain extender is any one of trisglycidyl isocyanurate, pyromellitic dianhydride, or epoxy resin.

[0014] Preferably, the particle size of the nano calcium carbonate is 10-100nm.

[0015] Preferably, the flame retardant is any one of magnesium hydroxide, zinc borate, or diantimony trioxide.

[0016] Preferably, the weight ratio of the recycled PET, ethylene glycol, and potassium carbonate in step S1 is 100:(200-300):(6-8).

[0017] Preferably, the weight ratio of the filtered product, methanol, and potassium carbonate in step S1 is 80:(20-30):(0.2-0.5).

[0018] Preferably, the weight ratio of the deionized water, 6-amino-1-hexanol, and dimethyl terephthalate in step S2 is (0.1-2):5:6.

[0019] Preferably, the weight ratio of the regenerated DMT, ethylene glycol, 1,4-cyclohexane dimethanol, amide glycol, 2,6-pyridine dimethanol, transesterification catalyst, polycondensation catalyst and stabilizer in step S3 is 200:(88-130):(36-108):(20-41):(3.5-10):(0.02-0.03):(0.04-0.05):(0.08-0.1).

[0020] Preferably, the transesterification catalyst in step S3 is zinc acetate.

[0021] Preferably, the polycondensation catalyst in step S3 is antimony trioxide.

[0022] Preferably, the stabilizer in step S3 is triphenyl phosphate.

[0023] Further, the application also provides a preparation method of a high-wear-resistance and anti-deformation PETG composite board, comprising the following steps:

[0024] (1) drying PET and modified PETG in a hot air oven to remove moisture;

[0025] (2) then mixing all raw materials according to weight parts, and then feeding into a preheating device and preheating in an environment of 100-120°C for 30-60 min;

[0026] (3) introducing the preheated mixed material into a double-screw extruder, and extruding and cutting the molten mixed material to obtain a high-wear-resistance and anti-deformation PETG composite board, wherein the melting temperature is 230-250°C, and the extruder speed is 150-260 r / min.

[0027] The application has the following beneficial effects:

[0028] (1) The application introduces 6-pyridine dimethanol into the reaction for synthesizing modified PETG, introduces heterocyclic rings in the crosslinked network, forms hydrogen bonds and π-π interactions, and improves the wear resistance, impact resistance and deformation resistance of the finally obtained board.

[0029] (2) The application introduces amide glycol into the reaction for synthesizing modified PETG, introduces amide groups and a large number of hydrogen bonds in the crosslinked network, improves the wear resistance, impact resistance and deformation resistance of the board, and due to the good thermal stability of the amide group, the deformation resistance of the board is stronger at high temperature.

[0030] (3) This application introduces 6-pyridinediethanol and amide diol into the reaction for synthesizing modified PETG, thereby introducing a large number of hydrogen bonds, amide groups, and heterocycles, which improves its wear resistance, impact resistance, and deformation resistance. Most importantly, the two have a certain synergistic effect, which together greatly improves the deformation resistance of the sheet material. This is likely due to the formation of dynamic reversible covalent bonds within the crosslinked network, giving the material a certain self-healing property. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments.

[0032] The nano-calcium carbonate used in the embodiments and comparative examples of this application has a particle size of 50 nm and was purchased from Shanghai McLean Biochemical Technology Co., Ltd., with product number C886288.

[0033] Example 1

[0034] This embodiment provides a highly wear-resistant and deformation-resistant PETG composite sheet, and the specific preparation steps are as follows:

[0035] (1) Mix 500g of recycled PET with 1000g of ethylene glycol, then add 30g of potassium carbonate, react at 190℃ for 2h, filter, mix 240g of the filtered product with 60g of methanol, add 0.6g of potassium carbonate, react at 60℃ for 3h, filter, centrifuge, and distill to obtain regenerated DMT.

[0036] (2) Under a nitrogen atmosphere, 0.5 g of deionized water, 25 g of 6-amino-1-hexanol and 30 g of dimethyl terephthalate were mixed and reacted at 120 °C for 3 h to obtain amide diol;

[0037] (3) 1,4-cyclohexanediethanol was heated and melted. Then, 108g of 1,4-cyclohexanediethanol was mixed with 200g of regenerated DMT, 88g of ethylene glycol, 10g of 2,6-pyridinediethanol, 41g of amide diol and 0.02g of zinc acetate. After stirring evenly, the mixture was reacted at 160℃ for 2h to obtain a prepolymer. Then, 0.04g of antimony trioxide and 0.08g of triphenyl phosphate were added to the reaction system and reacted at 40Pa and 260℃ for 1h to obtain modified PETG.

[0038] (4) Dry PET and modified PETG in a hot air oven to remove moisture;

[0039] (5) Then mix 30g of PET, 10g of modified PETG, 1g of polypropylene grafted maleic anhydride, 0.5g of antioxidant 1010, 40g of nano calcium carbonate, 1g of EBS, 1g of pyromellitic dianhydride, 0.5-1g of polyamide and 8g of magnesium hydroxide evenly, put them into the preheating device, and preheat them at 100°C for 30min.

[0040] (6) The preheated mixture is fed into a twin-screw extruder. The molten mixture is extruded and cut into shape by the twin-screw extruder to obtain a high wear-resistant and deformation-resistant PETG composite sheet. The melting temperature is 230℃ and the extruder speed is 150r / min.

[0041] Example 2

[0042] This embodiment provides a highly wear-resistant and deformation-resistant PETG composite sheet, and the specific preparation steps are as follows:

[0043] (1) Mix 500g of recycled PET with 1300g of ethylene glycol, then add 35g of potassium carbonate, react at 200℃ for 3h, filter, mix 240g of the filtered product with 75g of methanol, add 1.2g of potassium carbonate, react at 65℃ for 3h, filter, centrifuge, and distill to obtain regenerated DMT.

[0044] (2) Under a nitrogen atmosphere, 5g of deionized water, 25g of 6-amino-1-hexanol and 30g of dimethyl terephthalate were mixed and reacted at 170°C for 4h to obtain amide diol;

[0045] (3) 1,4-cyclohexanediethanol was heated and melted. Then, 72g of 1,4-cyclohexanediethanol was mixed with 200g of regenerated DMT, 110g of ethylene glycol, 7.5g of 2,6-pyridinediethanol, 30g of amide diol and 0.03g of zinc acetate. After stirring evenly, the mixture was reacted at 180℃ for 3h to obtain a prepolymer. Then, 0.04g of antimony trioxide and 0.09g of triphenyl phosphate were added to the reaction system and reacted at 45Pa and 275℃ for 1.5h to obtain modified PETG.

[0046] (4) Dry PET and modified PETG in a hot air oven to remove moisture;

[0047] (5) Then, 40g of PET, 15g of modified PETG, 2g of polypropylene grafted maleic anhydride, 0.7g of antioxidant 1010, 45g of nano calcium carbonate, 1.5g of amide wax, 1.3g of pyromellitic dianhydride, 0.8g of polyamide and 10g of magnesium hydroxide are mixed evenly and put into a preheating device, and preheated at 110°C for 45min.

[0048] (6) The preheated mixture is fed into a twin-screw extruder. The molten mixture is extruded and cut into shape by the twin-screw extruder to obtain a high wear-resistant and deformation-resistant PETG composite sheet. The melting temperature is 240℃ and the extruder speed is 200r / min.

[0049] Example 3

[0050] This embodiment provides a highly wear-resistant and deformation-resistant PETG composite sheet, and the specific preparation steps are as follows:

[0051] (1) Mix 500g of recycled PET with 1400g of ethylene glycol, then add 38g of potassium carbonate, react at 210℃ for 3h, filter, mix 240g of the filtered product with 80g of methanol, add 1.2g of potassium carbonate, react at 65℃ for 4h, filter, centrifuge, and distill to obtain regenerated DMT.

[0052] (2) Under a nitrogen atmosphere, 8g of deionized water, 25g of 6-amino-1-hexanol and 30g of dimethyl terephthalate were mixed and reacted at 200℃ for 4h to obtain amide diol;

[0053] (3) 1,4-cyclohexanediethanol was heated and melted. Then, 69g of 1,4-cyclohexanediethanol was mixed with 200g of regenerated DMT, 120g of ethylene glycol, 5g of 2,6-pyridinediethanol, 25g of amide diol and 0.03g of zinc acetate. After stirring evenly, the mixture was reacted at 200℃ for 3h to obtain a prepolymer. Then, 0.05g of antimony trioxide and 0.1g of triphenyl phosphate were added to the reaction system and reacted at 50Pa and 270℃ for 1h to obtain modified PETG.

[0054] (4) Dry PET and modified PETG in a hot air oven to remove moisture;

[0055] (5) Then, 45g of PET, 18g of modified PETG, 3g of polypropylene grafted maleic anhydride, 1g of antioxidant 1010, 45g of nano calcium carbonate, 2g of amide wax, 1.4g of pyromellitic dianhydride, 0.8g of polyamide and 11g of magnesium hydroxide are mixed evenly and put into a preheating device and preheated at 120°C for 50min.

[0056] (6) The preheated mixture is fed into a twin-screw extruder. The molten mixture is extruded and cut into shape by the twin-screw extruder to obtain a high wear-resistant and deformation-resistant PETG composite sheet. The melting temperature is 250℃ and the extruder speed is 260r / min.

[0057] Example 4

[0058] This embodiment provides a highly wear-resistant and deformation-resistant PETG composite sheet, and the specific preparation steps are as follows:

[0059] (1) Mix 500g of recycled PET with 1000g of ethylene glycol, then add 40g of potassium carbonate, react at 210℃ for 4h, filter, mix 240g of the filtered product with 90g of methanol, add 1.5g of potassium carbonate, react at 70℃ for 4h, filter, centrifuge, and distill to obtain regenerated DMT.

[0060] (2) Under a nitrogen atmosphere, 10g of deionized water, 25g of 6-amino-1-hexanol and 30g of dimethyl terephthalate were mixed and reacted at 220℃ for 3-5h to obtain amide diol;

[0061] (3) 1,4-cyclohexanediethanol was heated and melted. Then, 36g of 1,4-cyclohexanediethanol was mixed with 200g of regenerated DMT, 130g of ethylene glycol, 3.5g of 2,6-pyridinediethanol, 20g of amide diol and 0.03g of zinc acetate. After stirring evenly, the mixture was reacted at 200℃ for 3h to obtain a prepolymer. Then, 0.05g of antimony trioxide and 0.1g of triphenyl phosphate were added to the reaction system and reacted at 50Pa and 290℃ for 1.5h to obtain modified PETG.

[0062] (4) Dry PET and modified PETG in a hot air oven to remove moisture;

[0063] (5) Then, 50g of PET, 20g of modified PETG, 3g of polypropylene grafted maleic anhydride, 1g of antioxidant 1010, 50g of nano calcium carbonate, 2g of amide wax, 1.5g of pyromellitic dianhydride, 1g of polyamide and 12g of magnesium hydroxide are mixed evenly and put into a preheating device and preheated at 120°C for 60min.

[0064] (6) The preheated mixture is fed into a twin-screw extruder. The molten mixture is extruded and cut into shape by the twin-screw extruder to obtain a high wear-resistant and deformation-resistant PETG composite sheet. The melting temperature is 250℃ and the extruder speed is 260r / min.

[0065] Comparative Example 1

[0066] This comparative example provides a PETG composite sheet, and the specific preparation steps are as follows:

[0067] (1) Mix 500g of recycled PET with 1300g of ethylene glycol, then add 35g of potassium carbonate, react at 200℃ for 3h, filter, mix 240g of the filtered product with 75g of methanol, add 1.2g of potassium carbonate, react at 65℃ for 3h, filter, centrifuge, and distill to obtain regenerated DMT.

[0068] (2) Under a nitrogen atmosphere, 5g of deionized water, 25g of 6-amino-1-hexanol and 30g of dimethyl terephthalate were mixed and reacted at 170°C for 4h to obtain amide diol;

[0069] (3) 1,4-cyclohexanediethanol was heated and melted. Then, 72g of 1,4-cyclohexanediethanol was mixed with 200g of regenerated DMT, 110g of ethylene glycol, 30g of amide diol and 0.03g of zinc acetate. After stirring evenly, the mixture was reacted at 180℃ for 3h to obtain a prepolymer. Then, 0.04g of antimony trioxide and 0.09g of triphenyl phosphate were added to the reaction system and reacted at 45Pa and 275℃ for 1.5h to obtain modified PETG.

[0070] (4) Dry PET and modified PETG in a hot air oven to remove moisture;

[0071] (5) Then, 40g of PET, 15g of modified PETG, 2g of polypropylene grafted maleic anhydride, 0.7g of antioxidant 1010, 45g of nano calcium carbonate, 1.5g of amide wax, 1.3g of pyromellitic dianhydride, 0.8g of polyamide and 10g of magnesium hydroxide are mixed evenly and put into a preheating device, and preheated at 110°C for 45min.

[0072] (6) The preheated mixture is fed into a twin-screw extruder. The molten mixture is extruded and cut into shape by the twin-screw extruder to obtain a high wear-resistant and deformation-resistant PETG composite sheet. The melting temperature is 240℃ and the extruder speed is 200r / min.

[0073] Comparative Example 2

[0074] This comparative example provides a PETG composite sheet, and the specific preparation steps are as follows:

[0075] (1) Mix 500g of recycled PET with 1300g of ethylene glycol, then add 35g of potassium carbonate, react at 200℃ for 3h, filter, mix 240g of the filtered product with 75g of methanol, add 1.2g of potassium carbonate, react at 65℃ for 3h, filter, centrifuge, and distill to obtain regenerated DMT.

[0076] (2) Under a nitrogen atmosphere, 5g of deionized water, 25g of 6-amino-1-hexanol and 30g of dimethyl terephthalate were mixed and reacted at 170°C for 4h to obtain amide diol;

[0077] (3) 1,4-cyclohexanediethanol was heated and melted. Then, 72g of 1,4-cyclohexanediethanol was mixed with 200g of regenerated DMT, 110g of ethylene glycol, 7.5g of 2,6-pyridinediethanol and 0.03g of zinc acetate. After stirring evenly, the mixture was reacted at 180℃ for 3h to obtain a prepolymer. Then, 0.04g of antimony trioxide and 0.09g of triphenyl phosphate were added to the reaction system and reacted at 45Pa and 275℃ for 1.5h to obtain modified PETG.

[0078] (4) Dry PET and modified PETG in a hot air oven to remove moisture;

[0079] (5) Then, 40g of PET, 15g of modified PETG, 2g of polypropylene grafted maleic anhydride, 0.7g of antioxidant 1010, 45g of nano calcium carbonate, 1.5g of amide wax, 1.3g of pyromellitic dianhydride, 0.8g of polyamide and 10g of magnesium hydroxide are mixed evenly and put into a preheating device, and preheated at 110°C for 45min.

[0080] (6) The preheated mixture is fed into a twin-screw extruder. The molten mixture is extruded and cut into shape by the twin-screw extruder to obtain a high wear-resistant and deformation-resistant PETG composite sheet. The melting temperature is 240℃ and the extruder speed is 200r / min.

[0081] Comparative Example 3

[0082] This comparative example provides a PETG composite sheet, and the specific preparation steps are as follows:

[0083] (1) Mix 500g of recycled PET with 1300g of ethylene glycol, then add 35g of potassium carbonate, react at 200℃ for 3h, filter, mix 240g of the filtered product with 75g of methanol, add 1.2g of potassium carbonate, react at 65℃ for 3h, filter, centrifuge, and distill to obtain regenerated DMT.

[0084] (2) Under a nitrogen atmosphere, 5g of deionized water, 25g of 6-amino-1-hexanol and 30g of dimethyl terephthalate were mixed and reacted at 170°C for 4h to obtain amide diol;

[0085] (3) 1,4-cyclohexanediethanol was heated and melted. Then, 72g of 1,4-cyclohexanediethanol was mixed with 200g of regenerated DMT, 110g of ethylene glycol and 0.03g of zinc acetate. After stirring evenly, the mixture was reacted at 180℃ for 3h to obtain a prepolymer. Then, 0.04g of antimony trioxide and 0.09g of triphenyl phosphate were added to the reaction system and reacted at 45Pa and 275℃ for 1.5h to obtain modified PETG.

[0086] (4) Dry PET and modified PETG in a hot air oven to remove moisture;

[0087] (5) Then, 40g of PET, 15g of modified PETG, 2g of polypropylene grafted maleic anhydride, 0.7g of antioxidant 1010, 45g of nano calcium carbonate, 1.5g of amide wax, 1.3g of pyromellitic dianhydride, 0.8g of polyamide and 10g of magnesium hydroxide are mixed evenly and put into a preheating device, and preheated at 110°C for 45min.

[0088] (6) The preheated mixture is fed into a twin-screw extruder. The molten mixture is extruded and cut into shape by the twin-screw extruder to obtain a high wear-resistant and deformation-resistant PETG composite sheet. The melting temperature is 240℃ and the extruder speed is 200r / min.

[0089] Performance testing

[0090] Abrasion resistance test: The caster abrasion resistance test was conducted on the samples obtained in the example according to ISO 4918. After 35,000 revolutions, it was observed whether delamination, opening, surface damage, cracking, etc. appeared on the material surface. The test results are shown in Table 1.

[0091] Impact resistance test: The samples obtained in the examples were tested according to EN 13329:2006. A large ball was dropped from 1800 mm, and the surface was observed for damage such as cracks, delamination, and peeling.

[0092] Water absorption swelling rate test: The samples obtained in the examples were tested according to ISO 24336, and the test results are shown in Table 1;

[0093] Locking tensile strength test: The short side of the sample obtained in the example was tested according to ISO 24334, and the test results are shown in Table 1;

[0094] Deformation resistance test:

[0095] According to GT / B4085-2015, the samples obtained from the examples and comparative examples were subjected to warpage tests at 5℃×2h, 10℃×2h, 23℃×2h, and 38℃×2h, respectively. The test results are shown in Table 2.

[0096] Table 1. Performance test results of the samples in the examples.

[0097] Table 2 Performance test results of the examples and comparative examples

[0098] Data analysis shows from Examples 1-4 in Tables 1 and 2 that the high wear-resistant and deformation-resistant PETG composite sheet of this application has good wear resistance, impact resistance, water resistance and tensile properties. Most importantly, it has excellent deformation resistance at 0-38℃ and can be perfectly applied to daily life.

[0099] As can be seen from Example 2 and Comparative Example 1 in Table 2, adding 6-pyridinediethanol to the reaction that participates in the synthesis of modified PETG introduces heterocycles into the crosslinking network, forming hydrogen bonds and π-π interactions, which improves the deformation properties of the final sheet material.

[0100] As can be seen from Example 2 and Comparative Example 2 in Table 2, adding amide diol to the reaction that participates in the synthesis of PETG introduces amide groups and a large number of hydrogen bonds into the crosslinking network, which improves the deformation resistance of the board. Furthermore, due to the good thermal stability of the amide group, the board has stronger deformation resistance at high temperatures.

[0101] As can be seen from Example 2 and Comparative Examples 1, 2, and 3 in Table 2, the addition of 6-pyridinediethanol and amide diol to the reaction for synthesizing PETG introduces a large number of hydrogen bonds, as well as amide groups and heterocycles, thereby improving its deformation resistance. Most importantly, the two exhibit a certain synergistic effect, jointly resulting in a significant improvement in the deformation resistance of the sheet material. This is likely due to the formation of dynamic reversible covalent bonds within the crosslinked network, giving the material a certain degree of self-healing properties.

[0102] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this application as described above, which are not provided in detail for the sake of brevity.

[0103] This application is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A high-wear-resistance and deformation-resistant PETG composite board, comprising the following components in parts by weight: PET 30-50 parts, modified PETG 10-20 parts, nano calcium carbonate 40-50 parts, toughening agent 1-3 parts, antioxidant 0.5-1 part, lubricant 1-2 parts, chain extender 1-1.5 parts, polyamide 0.5-1 part, and flame retardant 8-12 parts. The preparation steps of the modified PETG are as follows: S1: mixing recycled PET with ethylene glycol, then adding potassium carbonate, reacting at 190-210℃ for 2-4h, filtering, mixing the filtered product with methanol, adding potassium carbonate, reacting at 60-70℃ for 3-4h, filtering, centrifuging, and distilling to obtain regenerated DMT; S2: mixing deionized water, 6-amino-1-hexanol, and dimethyl terephthalate under nitrogen atmosphere, reacting at 120-220℃ for 3-5h to obtain amide diol; S3: heating and melting 1,4-cyclohexane dimethanol, then mixing it with regenerated DMT, ethylene glycol, 2,6-pyridine dimethanol, amide diol, and ester exchange catalyst, uniformly stirring, then reacting at 160-200℃ for 2-3h to obtain a prepolymer, then adding polycondensation catalyst and stabilizer to the reaction system, and reacting at 40-50Pa and 260-290℃ for 1-1.5h to obtain the modified PETG.

2. The high wear resistant, low distortion PETG composite sheet material of claim 1, wherein, The toughening agent is any one of polypropylene grafted maleic anhydride, TPU, TPE, SEBS, EEA, or rubber powder.

3. The high wear resistant, low distortion PETG composite sheet material of claim 1, wherein, The antioxidant is any one of antioxidant 1010 or antioxidant 168.

4. The high wear resistant, low distortion PETG composite sheet of claim 1, wherein, The lubricant is any one of OPE wax, amide wax, low-molecular polyethylene wax, or EBS.

5. The high wear resistant, low distortion PETG composite sheet material of claim 1, wherein, The chain extender is any one of trisglycidyl isocyanurate, pyromellitic dianhydride, or epoxy resin.

6. The high wear resistant, low distortion PETG composite sheet material of claim 1, wherein, The weight ratio of the recycled PET, ethylene glycol, and potassium carbonate in step S1 is 100:(200-300):(6-8).

7. The high wear resistant, low distortion PETG composite sheet material of claim 1, wherein, The weight ratio of the filtered product, methanol, and potassium carbonate in step S1 is 80:(20-30):(0.2-0.5).

8. The high wear resistant, low distortion PETG composite sheet material of claim 1, wherein, The weight ratio of the deionized water, 6-amino-1-hexanol, and dimethyl terephthalate in step S2 is (0.1-2):5:

6.

9. The high wear resistant, low distortion PETG composite sheet material of claim 1, wherein, The weight ratio of the regenerated DMT, ethylene glycol, 1,4-cyclohexane dimethanol, amide diol, 2,6-pyridine dimethanol, ester exchange catalyst, polycondensation catalyst, and stabilizer in step S3 is 200:(88-130):(36-108):(20-41):(3.5-10):(0.02-0.03):(0.04-0.05):(0.08-0.1). 10.A method for preparing the high-wear-resistance and deformation-resistant PETG composite board according to any one of claims 1-9, comprising the following steps: (1) drying PET and modified PETG in a hot air oven to remove moisture; (2) then uniformly mixing all raw materials by weight, and then putting them into a preheating device and preheating in an environment of 100-120℃ for 30-60min. (3) the preheated mixed material is introduced into a double screw extruder, and the melted mixed material is extruded and cut into a high wear-resistant and deformation-resistant PETG composite board by the double screw extruder, wherein, The melting temperature is 230-250℃, and the rotating speed of the extruder is 150-260r / min.

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