A kind of anti-reflective thermoplastic acrylic copolymer and its preparation method and application

Abstract

This invention discloses a thermoplastic acrylate copolymer with enhanced transmittance, its preparation method, and application. The copolymer is prepared from the following components: I. an acrylate monomer; II. a vinyl monomer; III. a pre-cured auxiliary composition comprising: i. a long-chain fatty acid; ii. a long-chain aliphatic amide; iii. a UV absorber; and iv. an anthraquinone derivative. This invention provides a thermoplastic acrylate copolymer with enhanced light transmittance and luminous flux, particularly suitable for use in thick-walled optical products.

Description

Technical Field

[0001] The present invention relates to a thermoplastic polymer material, in particular to a transparent thermoplastic acrylic copolymer and a preparation method and application thereof. Background Art

[0002] Thermoplastic acrylic copolymers are a class of thermoplastic polymers made from copolymerizable monomers. Due to their unique thermoplastic properties, these polymers are widely used in the automotive, home appliance, cosmetic packaging, lighting, and other markets.

[0003] Interior decoration and thick-walled optical products often require very high resin transmittance. Traditionally, this approach involves coating the surface of the product with an antireflection film, leveraging the interference properties of light to increase transmittance and luminous flux. However, this technology is notoriously expensive and requires a very strict coating process. Furthermore, the film is susceptible to performance loss under prolonged, high-light conditions. Therefore, the development of thermoplastic acrylic copolymers with high transmittance and thick walls is extremely important. Summary of the Invention

[0004] To address the above technical problems, the present invention provides a thermoplastic acrylic copolymer with enhanced transmittance, its preparation method, and its application. By pre-mixing specific additives and then pre-curing the copolymer, the present invention achieves a blue shift in the resin's absorption spectrum while maintaining excellent UV absorption and dyeing properties. This significantly reduces the amount of energy absorbed from visible light or lamplight, thereby increasing light transmittance and luminous flux, achieving a thick-walled enhanced transmittance effect.

[0005] To achieve the above object, the technical solutions adopted by the present invention are as follows:

[0006] A thermoplastic acrylic copolymer with an anti-reflective property is prepared from components comprising the following raw materials:

[0007] I, acrylate monomer, 30-100 parts by mass, preferably 40-95 parts by mass;

[0008] II, vinyl monomer, 0-70 parts by mass, preferably 5-60 parts by mass;

[0009] III. A pre-curing auxiliary composition, based on 100 parts by mass of the total mass of the acrylic ester monomer and the vinyl monomer, comprises:

[0010] i. long-chain fatty acids, 0.01-0.5 parts by mass, preferably 0.1-0.3 parts by mass;

[0011] ii. long-chain aliphatic amide, 0.01-0.1 parts by mass, preferably 0.01-0.05 parts by mass;

[0012] iii. UV absorber, 0.001-0.07 parts by mass, preferably 0.007-0.035 parts by mass;

[0013] iv. anthraquinone derivatives, 0.00001-0.0005 parts by mass, preferably 0.00005-0.0001 parts by mass;

[0014] The ultraviolet absorber is selected from at least one of the substances having the following structural expressions:

[0015]

[0016] The anthraquinone derivative is selected from at least one substance having the following structural expression:

[0017]

[0018] Wherein, R1-R6 are independently selected from hydrogen, halogen, hydroxyl, and alkyl, and at least one of R1-R6 is hydroxyl; R7-R 14 Each independently selected from hydrogen, halogen, sulfonic acid, hydroxyl, alkylhydroxyl, amino, amide, arylamine, arylamide, and R7-R 14 At least one of them is a hydroxyl group or an alkylhydroxyl group;

[0019] Preferably, R1-R6 are independently selected from hydrogen atoms, chlorine atoms, hydroxyl groups, C1-C 10 Alkyl, and at least one of R1-R6 is hydroxyl; R7-R 14 Each independently selected from hydrogen atoms, chlorine atoms, sulfonic acid groups, hydroxyl groups, amino groups, C6-C 15 Arylamine, C6-C 15 The aromatic amide group, and R7-R 14 At least one of them is a hydroxyl group.

[0020] Preferably, the ultraviolet absorber is selected from one or more of UV-P, UV-326, UV-327, UV-328, UV-329, and UV-5411;

[0021] Preferably, the anthraquinone derivative is one or more of Solvent Violet 13, Solvent Blue 74, and Solvent Blue 122.

[0022] As a preferred technical solution of the present invention, the acrylic acid ester monomer is selected from one or more of methyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, and butyl acrylate, preferably one or two of methyl acrylate, methyl methacrylate, and butyl acrylate.

[0023] As a preferred technical solution of the present invention, the vinyl monomer is selected from one or more of styrene, α-methylstyrene, acrylonitrile, acrylic acid, methacrylic acid, and vinyl acetate, preferably one or two of styrene, acrylonitrile, and methacrylic acid.

[0024] As a preferred technical solution of the present invention, the long-chain fatty acid is a fatty acid with a carbon number greater than 12, preferably a fatty acid with a carbon number of 12-18, more preferably one or more of lauric acid, myristic acid, hexadecanoic acid, and octadecanoic acid.

[0025] As a preferred technical solution of the present invention, the long-chain fatty amide is a fatty amide with a carbon number greater than 12, preferably a fatty amide with a carbon number of 12-22, and more preferably one or more of lauramide, urea, palmitoyl amide, oleamide, eicosamide, and erucamide.

[0026] As a preferred technical solution of the present invention, the pre-curing treatment involves curing the mixed components at 90-150°C, preferably 100-130°C, for 0-24 hours, preferably 6-16 hours. Curing at too high a temperature or for too long a time can easily lead to an overreaction, causing the material to turn yellow and weakening the demolding effect. Curing at too low a temperature or for too short a time can result in insufficient mixing of the materials and a less pronounced thick-walled, transparent-enhancing effect.

[0027] As a preferred technical solution of the present invention, the weight average molecular weight of the copolymer is 50,000-300,000, preferably 700,000-200,000, and more preferably 90,000-12,000.

[0028] The polymerization process of the thermoplastic acrylic copolymer of the present invention can be any of bulk polymerization, solution polymerization, and suspension polymerization. From the perspective of product performance and process matching, batch or continuous bulk polymerization is preferred, and continuous bulk polymerization is more preferred.

[0029] As a preferred embodiment, a method for preparing the above-mentioned anti-transmittance thermoplastic acrylic copolymer comprises the following steps:

[0030] S1. Mix a long-chain fatty acid, a long-chain fatty amide, a UV absorber, and an anthraquinone derivative, heat to 90-150° C., preferably 100-130° C., and age for 0-24 hours, preferably 6-16 hours, to obtain a molten mixture A;

[0031] S2, adding an acrylic acid ester monomer, optionally a vinyl monomer, an initiator, and a chain transfer agent into a polymerization kettle, and performing a polymerization reaction under stirring to obtain a mixed material B;

[0032] S3. After devolatilization, the mixture B is added to an extruder, and the mixture A is added at the same time. The mixture is extruded and granulated to obtain the thermoplastic acrylic copolymer.

[0033] As a preferred technical solution of the present invention, the initiator is selected from one or more of dibenzoyl peroxide, tert-butyl peroxy-2-ethylhexanoate, tert-butyl peroxyisobutyrate, tert-butyl peroxyacetate, dicumyl peroxide, 1,1-bis-(tert-butylperoxy)-3,3,5-trimethylcyclohexane, tert-butyl peroxy-3,5,5-trimethylhexanoate, tert-butyl peroxybenzoate, tert-butyl peroxide isopropylbenzene, cumene hydroperoxide and tert-butyl hydroperoxide, preferably tert-butyl peroxy-3,5,5-trimethylhexanoate and / or dicumyl peroxide;

[0034] Preferably, the amount of the initiator added is 0.001-0.01%, preferably 0.003-0.007%, of the total mass of the acrylate monomer and the vinyl monomer;

[0035] and / or, the chain transfer agent is selected from one or more of n-butyl mercaptan, tert-butyl mercaptan, n-octyl mercaptan, isooctyl mercaptan, n-dodecyl mercaptan and tert-dodecyl mercaptan, preferably n-octyl mercaptan;

[0036] Preferably, the added amount of the chain transfer agent is 0.1-1%, preferably 0.15-0.5%, of the total mass of the acrylic ester monomer and the vinyl monomer.

[0037] As a preferred technical solution of the present invention, the polymerization reaction conditions in step S2 are a reaction temperature of 120-150°C and an average reaction residence time of 2-6 hours, preferably 3-5 hours. "Average residence time" refers to the ratio of the liquid volume in the reactor to the reaction liquid feed rate. The average residence time primarily affects the conversion rate. If the average residence time is too short, the conversion rate will not meet production requirements. If the average residence time is too long, the production economy will be unsustainable.

[0038] As a further supplementary explanation, the conversion rate at the outlet of the polymerization reactor in step S2 is controlled at 65-85%, preferably 70-75%, to provide suitable product viscosity and process economy.

[0039] Preferably, the reactor in step S2 is a fully mixed flow high-pressure reactor.

[0040] As a preferred embodiment, the devolatilization conditions of the mixed material B are: devolatilization temperature of 220-240°C, vacuum degree of 1-50 mbar, residence time of 5-10 min; after devolatilization, the acrylic ester monomer content in the material is <500 ppm, and the vinyl monomer content is <500 ppm.

[0041] As a preferred embodiment, the extrusion temperature in step S3 is 210-230° C., and the residence time is 1-5 min.

[0042] Application of the above-mentioned anti-reflection thermoplastic acrylate copolymer or the anti-reflection thermoplastic acrylate copolymer prepared by the above-mentioned method in large lenses, light guide strips and thick-walled products.

[0043] Compared with the prior art, the present invention has the following positive effects:

[0044] The present invention can provide a thermoplastic acrylic copolymer with improved light transmittance and luminous flux, and is particularly suitable for application in thick-walled optical products. DETAILED DESCRIPTION

[0045] The present invention will be further described below through specific examples. The examples of the present invention are only for illustration of the present invention and do not limit the scope of the present invention.

[0046] Unless otherwise specified, the raw materials and reagents used in the following examples of the present invention were purchased from commercial sources. The main raw material information is shown in Table 1:

[0047] Table 1. Main raw material information

[0048] Raw material name Other names or abbreviations level supplier Methyl methacrylate MMA Industrial grade Aladdin Methyl acrylate MA Industrial grade Aladdin Butyl acrylate BA Industrial grade Aladdin Styrene SM Industrial grade Aladdin Acrylonitrile AN Industrial grade Aladdin Methacrylic acid MAA Industrial grade Aladdin acrylic acid AA Industrial grade Aladdin Dicumyl peroxide DCP Industrial grade Croda UK n-Octylmercaptan NOM Industrial grade Chevron Hexadecanoic acid / AR Aladdin Octadecanoic acid / AR Aladdin Lauric acid / AR Aladdin Myristic acid / AR Aladdin Lauramide / AR Aladdin Palmitoyl amide / AR Aladdin Oleamide / AR Aladdin Erucamide / AR Aladdin Zinc stearate / AR Aladdin UV absorber uv-p / Industrial grade Lianlong UV absorber uv-326 / Industrial grade Lianlong UV absorber uv-327 / Industrial grade Lianlong UV absorber UV-328 / Industrial grade Lianlong UV absorber UV-329 / Industrial grade Lianlong UV absorber RMB Resorcinol monobenzoate Industrial grade Lianlong Solvent Violet 13 / Industrial grade LANXESS Solvent Blue 74 / Industrial grade LANXESS Solvent Blue 122 Industrial grade LANXESS

[0049] The polymer related structure and performance test methods are as follows:

[0050] Molecular weight determination: Molecular weight was determined using gel permeation chromatography (GPC) with tetrahydrofuran (THF) as the mobile phase and a parallax refractometer. Monodisperse PMMA was used as the standard. Instrument manufacturer: Agilent; instrument model: 1260 Infinity; test standard: GB / T 21863-2008.

[0051] Light transmittance and haze testing: Optical properties can be measured using a colorimeter to determine total light transmittance, haze, and YI values. Instrument model: Hunterlab VIS; test standards: Haze ISO 14782, Light transmittance ISO 13148.

[0052] Melt index test: MFR is measured using a melt index instrument. Instrument manufacturer: GOTTFERT; instrument model: MI 40; test standard: ASTM D1238.

[0053] Mechanical Properties: Tensile, flexural strength, and modulus were tested using a universal testing machine. Instrument model: INSTRON 68SC; test standards: Tensile ISO 527, Flexural ISO 178.

[0054] Conversion rate test: Calculated based on the ratio of the mass of polymer at the extruder outlet to the amount of reaction liquid fed per unit time. A sampling tube is provided at the outlet of the polymerization kettle. The ratio of the solid residue to the sample is measured through vacuum oven devolatilization to calculate the conversion rate.

[0055] [Example 1]

[0056] S1, 7.5 kg of hexadecanoic acid, 0.75 kg of oleamide, 0.525 kg of UV absorber UV-P, and 3.75 g of solvent violet 13 were mixed, heated to 110 ° C, and aged for 6 hours to obtain a molten mixture A;

[0057] S2, 95kg methyl methacrylate, 5kg methyl acrylate, 5g diisopropylbenzene peroxide, 100g n-octyl mercaptan were added to a polymerization kettle, and polymerization reaction was carried out under stirring, the reaction temperature was controlled at 150°C, the residence time was 3h, and a mixture B with a conversion rate of 75% was obtained;

[0058] S3. Devolatilize the mixture B at 230° C. and 30 mbar for a residence time of 5 min, then add it to an extruder, and simultaneously add the mixture A. Extrude and granulate at 210° C. for a residence time of 2 min to obtain a thermoplastic acrylic copolymer.

[0059] [Example 2]

[0060] S1. 22.5 kg of lauric acid, 3.75 kg of erucamide, 0.525 kg of UV absorber UV-326, and 3 g of solvent blue 74 were mixed, heated to 120° C., and aged for 8 h to obtain a molten mixture A.

[0061] S2, to a polymerization kettle, 90 kg of methyl acrylate, 10 kg of methacrylic acid, 7 g of tert-butyl peroxy-3,5,5-trimethylhexanoate, and 200 g of n-dodecyl mercaptan were added, and polymerization reaction was carried out under stirring, the reaction temperature was controlled at 135 ° C., the residence time was 4 h, and a mixture B with a conversion rate of 74.3% was obtained;

[0062] S3. Devolatilize the mixture B at 220° C. and 10 mbar for a residence time of 1 min; then add it to an extruder, and add the mixture A at the same time. Extrude and granulate the mixture at 220° C. for a residence time of 1 min to obtain a thermoplastic acrylic copolymer.

[0063] [Example 3]

[0064] S1. 15 kg of myristic acid, 1.875 kg of lauramide, 2.625 kg of UV absorber UV-327, and 7.5 g of solvent blue 122 were mixed, heated to 125° C., and aged for 10 hours to obtain a molten mixture A.

[0065] S2, 60kg butyl acrylate, 40kg acrylonitrile, 3g t-butyl peroxybenzoate, 300g t-dodecyl mercaptan were added to a polymerization kettle, and polymerization reaction was carried out under stirring, the reaction temperature was controlled at 145°C, the residence time was 3h, and a mixture B with a conversion rate of 75.2% was obtained;

[0066] S3. Devolatilize the mixture B at 240° C. and 50 mbar for a residence time of 3 min; then add it to an extruder, and add the mixture A at the same time. Extrude and granulate the mixture at 230° C. for a residence time of 5 min to obtain a thermoplastic acrylic copolymer.

[0067] [Example 4]

[0068] S1, 3.75 kg of octadecanoic acid, 0.375 kg of palmitic acid amide, 0.15 kg of ultraviolet absorber UV-329, and 1.5 g of solvent violet 13 were mixed, heated to 130° C., and aged for 12 h to obtain a molten mixture A;

[0069] S2, 30kg methyl methacrylate, 70kg styrene, 4g diisopropylbenzene peroxide, 350g n-octyl mercaptan were added to the polymerization kettle, and the polymerization reaction was carried out under stirring. The reaction temperature was controlled at 140°C and the residence time was 4h to obtain a mixture B with a conversion rate of 74.8%;

[0070] S3. Devolatilize the mixture B at 230° C. and 30 mbar for a residence time of 4 min; then add it to an extruder, and add the mixture A at the same time. Extrude and granulate at 225° C. for a residence time of 3 min to obtain a thermoplastic acrylic copolymer.

[0071] [Example 5]

[0072] S1, 22.5kg hexadecanoic acid, 0.375kg oleamide, 2.625kg UV absorber UV-328, 5.25g solvent violet 13 were mixed, heated to 115°C, and aged for 16 hours to obtain a molten mixture A;

[0073] S2, 93kg methyl methacrylate, 7kg α-methylstyrene, 10g diisopropylbenzene peroxide, 150g n-octyl mercaptan were added to a polymerization kettle, and polymerization reaction was carried out under stirring, the reaction temperature was controlled at 135°C, the residence time was 5h, and a mixture B with a conversion rate of 74.5% was obtained;

[0074] S3. Devolatilize the mixture B at 230° C. and 30 mbar for a residence time of 5 min; then add it to an extruder, and add the mixture A at the same time. Extrude and granulate at 210° C. for a residence time of 2 min to obtain a thermoplastic acrylic copolymer.

[0075] [Example 6]

[0076] S1, 22.5kg hexadecanoic acid, 0.375kg oleamide, 2.625kg UV absorber UV-P, and 6.75g solvent violet 13 were mixed, heated to 125°C, and aged for 16 hours to obtain a molten mixture A;

[0077] S2, 99 kg of methyl methacrylate, 1 kg of acrylic acid, 1 g of diisopropylbenzene peroxide, and 400 g of n-octyl mercaptan were added to a polymerization kettle, and a polymerization reaction was carried out under stirring. The reaction temperature was controlled at 150° C. and the residence time was 3 h to obtain a mixture B with a conversion rate of 74.5%;

[0078] S3. Devolatilize the mixture B at 230° C. and 30 mbar for a residence time of 5 min; then add it to an extruder, and add the mixture A at the same time. Extrude and granulate at 210° C. for a residence time of 2 min to obtain a thermoplastic acrylic copolymer.

[0079] [Comparative Example 1]

[0080] A thermoplastic acrylic copolymer was prepared according to a process substantially the same as that of Example 1, except that the ultraviolet absorber UV-P was replaced by resorcinol monobenzoate.

[0081] [Comparative Example 2]

[0082] A thermoplastic acrylate copolymer was prepared according to substantially the same process as in Example 1, except that solvent violet 13 was replaced by solvent violet 14.

[0083] [Comparative Example 3]

[0084] A thermoplastic acrylic copolymer was prepared according to a process substantially the same as that of Example 1, except that hexadecanoic acid and oleamide were not added when preparing the mixed material A.

[0085] [Comparative Example 4]

[0086] A thermoplastic acrylic copolymer was prepared according to a process substantially the same as that in Example 1, except that in step S1, mixed material A was prepared by mixing 45 kg of hexadecanoic acid, 0.75 g of oleamide, 0.525 kg of UV absorber UV-P, and 10.5 g of solvent violet 13, heating to 130° C., and aging for 6 h.

[0087] [Comparative Example 5]

[0088] A thermoplastic acrylic copolymer was prepared according to a process substantially the same as that of Example 1, except that oleamide was replaced by zinc stearate.

[0089] [Comparative Example 6]

[0090] The auxiliary agent composition is directly added to the extruder without pre-curing to prepare the thermoplastic acrylic copolymer, and the method is as follows:

[0091] S1. Melt and mix 7.5 kg of hexadecanoic acid, 0.75 g of oleamide, 0.525 kg of UV absorber UV-P, and 3.75 g of solvent violet 13 at 80° C., and record the mixture as mixed material A.

[0092] S2, 95kg methyl methacrylate, 5kg methyl acrylate, 5g diisopropylbenzene peroxide, 100g n-octyl mercaptan were added to a polymerization kettle, and polymerization reaction was carried out under stirring, the reaction temperature was controlled at 150°C, the residence time was 3h, and a mixture B with a conversion rate of 75% was obtained;

[0093] S3. Devolatilize the mixture B at 230° C. and 30 mbar for a residence time of 5 min, then add it to an extruder, and simultaneously add the mixture A. Extrude and granulate at 210° C. for a residence time of 2 min to obtain a thermoplastic acrylic copolymer.

[0094] The copolymers prepared in the examples and comparative examples were tested for molecular weight, melt index, light transmittance, haze, and mechanical properties. The test results are shown in Table 1.

[0095] Table 1. Performance test results

[0096]

Claims

1. A thermoplastic acrylic copolymer with an anti-reflective property, characterized in that: Prepared from ingredients containing the following: I, acrylic acid ester monomer, 30-100 parts by mass; II. Vinyl monomer, 0-70 parts by mass; the vinyl monomer is selected from one or more of styrene, α-methylstyrene, acrylonitrile, acrylic acid, methacrylic acid, and vinyl acetate; III. A pre-curing auxiliary composition, based on 100 parts by mass of the total mass of the acrylic ester monomer and the vinyl monomer, comprises: i. long-chain fatty acids, 3.75-22.5 parts by mass; ii. long-chain aliphatic amide, 0.375-3.75 parts by mass; iii. UV absorber, 0.15-2.625 parts by mass; iv. anthraquinone derivatives, 1.5-7.5 parts by mass; The ultraviolet absorber is selected from at least one of the substances having the following structural expressions: The anthraquinone derivative is selected from at least one substance having the following structural expression: Wherein, R1-R6 are independently selected from hydrogen, halogen, hydroxyl, and alkyl, and at least one of R1-R6 is hydroxyl; R7-R 14 Each independently selected from hydrogen, halogen, sulfonic acid, hydroxyl, alkylhydroxyl, amino, amide, arylamine, arylamide, and R7-R 14 At least one of them is a hydroxyl group or an alkylhydroxyl group; The pre-aging is to age the mixed components at 90-150° C. for 6-24 hours.

2. The anti-reflective thermoplastic acrylic copolymer according to claim 1, characterized in that: Prepared from ingredients containing the following: I, acrylate monomer, 40-95 parts by mass; II, vinyl monomer, 5-60 parts by mass; III. A pre-curing auxiliary composition, based on 100 parts by mass of the total mass of the acrylic ester monomer and the vinyl monomer, comprises: i. long-chain fatty acids, 3.75-22.5 parts by mass; ii. long-chain aliphatic amide, 0.375-3.75 parts by mass; iii. UV absorber, 0.15-2.625 parts by mass; iv. anthraquinone derivatives, 1.5-7.5 parts by mass.

3. The anti-reflective thermoplastic acrylic copolymer according to claim 1, characterized in that: R1-R6 are each independently selected from hydrogen atoms, chlorine atoms, hydroxyl groups, C1-C 10 Alkyl, and at least one of R1-R6 is hydroxyl; R7-R 14 Each independently selected from hydrogen atoms, chlorine atoms, sulfonic acid groups, hydroxyl groups, amino groups, C6-C 15 Arylamine, C6-C 15 The aromatic amide group, and R7-R 14 At least one of them is a hydroxyl group.

4. The anti-reflective thermoplastic acrylic copolymer according to claim 1, characterized in that: The acrylic acid ester monomer is selected from one or more of methyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, and butyl acrylate.

5. The anti-reflective thermoplastic acrylic copolymer according to claim 4, characterized in that: The acrylic acid ester monomer is selected from one or two of methyl acrylate, methyl methacrylate and butyl acrylate.

6. The anti-reflective thermoplastic acrylic copolymer according to claim 1, characterized in that: The vinyl monomer is selected from one or two of styrene, acrylonitrile and methacrylic acid.

7. The anti-reflective thermoplastic acrylic copolymer according to any one of claims 1 to 6, characterized in that: The long-chain fatty acid is a fatty acid with carbon number greater than 12.

8. The anti-reflective thermoplastic acrylic copolymer according to any one of claims 1 to 6, characterized in that: The long-chain fatty acid is a fatty acid having 12 to 18 carbon atoms.

9. The anti-reflective thermoplastic acrylic copolymer according to any one of claims 1 to 6, characterized in that: The long-chain fatty acid is one or more of lauric acid, myristic acid, hexadecanoic acid and octadecanoic acid.

10. The anti-reflective thermoplastic acrylic copolymer according to claim 1, characterized in that: The long-chain fatty amide is a fatty amide with carbon number greater than 12.

11. The anti-reflective thermoplastic acrylic copolymer according to claim 1, characterized in that: The long-chain fatty amide is a fatty amide having 12 to 22 carbon atoms.

12. The anti-reflective thermoplastic acrylic copolymer according to claim 1, characterized in that: The long-chain fatty amide is one or more of lauramide, palmitoyl amide, oleamide, eicosamide, and erucamide.

13. The anti-reflective thermoplastic acrylic copolymer according to any one of claims 1 to 6, characterized in that: The pre-aging is to age the mixed components at 100-130° C. for 6-16 hours.

14. The anti-reflective thermoplastic acrylic copolymer according to any one of claims 1 to 6, characterized in that: The weight average molecular weight of the copolymer is 50,000-300,000.

15. A method for preparing the anti-reflective thermoplastic acrylic copolymer according to any one of claims 1 to 14, characterized in that: The following steps are involved: S1. Mix a long-chain fatty acid, a long-chain fatty amide, a UV absorber, and an anthraquinone derivative, heat to 90-150° C., and age for 6-24 hours to obtain a molten mixture A; S2, adding an acrylic acid ester monomer, a vinyl monomer, an initiator, and a chain transfer agent into a polymerization kettle, and performing a polymerization reaction under stirring to obtain a mixed material B; S3. After devolatilization, the mixture B is added to an extruder, and the mixture A is added at the same time. The mixture is extruded and granulated to obtain the thermoplastic acrylic copolymer.

16. The method for preparing the anti-reflective thermoplastic acrylic copolymer according to claim 15, characterized in that: Step S1: mixing long-chain fatty acids, long-chain fatty amides, ultraviolet absorbers, and anthraquinone derivatives, heating the mixture to 100-130° C., and subjecting the mixture to aging for 6-16 hours.

17. The method for preparing the anti-reflective thermoplastic acrylic copolymer according to claim 15, wherein: The initiator is selected from one or more of dibenzoyl peroxide, tert-butyl peroxy-2-ethylhexanoate, tert-butyl peroxyisobutyrate, tert-butyl peroxyacetate, dicumyl peroxide, 1,1-bis-(tert-butylperoxy)-3,3,5-trimethylcyclohexane, tert-butyl peroxy-3,5,5-trimethylhexanoate, tert-butyl peroxybenzoate, tert-butyl peroxide isopropylbenzene, cumene hydroperoxide and tert-butyl hydroperoxide, And / or, the chain transfer agent is selected from one or more of n-butyl mercaptan, tert-butyl mercaptan, n-octyl mercaptan, isooctyl mercaptan, n-dodecyl mercaptan and tert-dodecyl mercaptan.

18. The method for preparing the anti-reflective thermoplastic acrylic copolymer according to claim 17, wherein: The initiator is selected from tert-butyl peroxy-3,5,5-trimethylhexanoate and / or dicumyl peroxide.

19. The method for preparing the anti-reflective thermoplastic acrylic copolymer according to claim 17, wherein: The added amount of the initiator is 0.001-0.01% of the total mass of the acrylic ester monomer and the vinyl monomer.

20. The method for preparing the anti-reflective thermoplastic acrylic copolymer according to claim 19, wherein: The added amount of the initiator is 0.003-0.007% of the total mass of the acrylic ester monomer and the vinyl monomer.

21. The method for preparing the anti-reflective thermoplastic acrylic copolymer according to claim 17, wherein: The chain transfer agent is n-octyl mercaptan.

22. The method for preparing the anti-reflective thermoplastic acrylic copolymer according to claim 21, wherein: The added amount of the chain transfer agent is 0.1-1% of the total mass of the acrylic ester monomer and the vinyl monomer.

23. The method for preparing the anti-reflective thermoplastic acrylic copolymer according to claim 22, wherein: The added amount of the chain transfer agent is 0.15-0.5% of the total mass of the acrylic ester monomer and the vinyl monomer.

24. The method for preparing the anti-reflective thermoplastic acrylic copolymer according to any one of claims 15 to 23, characterized in that: The polymerization reaction conditions in step S2 are a reaction temperature of 120-150° C. and an average reaction residence time of 2-6 hours.

25. The method for preparing the anti-reflective thermoplastic acrylic copolymer according to claim 24, wherein: The average residence time of the polymerization reaction in step S2 is 3-5 hours.

26. The method for preparing the anti-reflective thermoplastic acrylic copolymer according to claim 25, wherein: The reactor in step S2 is a fully mixed flow high-pressure reactor.

27. Use of the anti-reflection thermoplastic acrylate copolymer according to any one of claims 1 to 14 or the anti-reflection thermoplastic acrylate copolymer prepared by the method according to any one of claims 15 to 26 in large lenses, light guide strips, and thick-walled products.

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