White light nylon copolymer as well as preparation method and application thereof

Abstract

The invention relates to the field of preparation of nylon copolymers, and discloses a white-light nylon copolymer as well as a preparation method and application thereof. The nylon copolymer contains a structural unit derived from a nylon monomer, a structural unit derived from an anthraquinone comonomer and a chain segment derived from a maleic anhydride copolymer, the anthraquinone comonomer is selected from diamino anthraquinone; the total mass of the nylon copolymer is 100%, and the mass content of the structural unit derived from the anthraquinone comonomer in the nylon copolymer is not higher than 0.3%. The nylon copolymer provided by the invention has excellent mechanical properties of nylon, has good ductility and flexibility, has white light compared with conventional nylon, and can greatly meet the application of the nylon copolymer in flexible display.

Description

Technical Field

[0001] The invention relates to the field of preparation of nylon copolymers, and in particular to a white nylon copolymer and a preparation method and application thereof. Background Art

[0002] Flexible white light emitting materials have important application prospects in flexible lighting, flexible display and biosensors. The existing preparation strategy is mainly to coat yellow phosphor or organic light-emitting small molecule gel on the blue backlight source, and obtain white light by superposition of blue light and yellow light. However, inorganic materials are usually brittle and hard, and the bonding strength between the phosphor and the substrate is insufficient, which greatly limits the ductility and flexibility of flexible devices; and the mechanical properties of organic light-emitting small molecule gel coatings are poor, and it is difficult to meet application requirements. At the same time, it also involves cumbersome organic synthesis processes and has limitations. Therefore, the development of flexible white light emitting materials with excellent mechanical properties is of great significance to promote the practical application of flexible display devices.

[0003] Nylon is a linear polymer with amide groups on the main chain. Nylon has good comprehensive properties, including mechanical properties, heat resistance, wear resistance, chemical resistance and self-lubrication, and has a low friction coefficient and a certain degree of flame retardancy. Once ignited, it will not burn continuously and has self-extinguishing properties. Nylon materials have received extensive attention in the industry due to their excellent properties, and with the advancement of technology, nylon has a wider range of applications.

[0004] If a nylon white light material is provided, it will greatly meet its application in flexible displays. Summary of the invention

[0005] In response to the above technical problems, the present invention provides a white light nylon copolymer and a preparation method and application thereof. The nylon copolymer of the present invention has both the excellent mechanical properties of nylon itself and good ductility and flexibility. Compared with conventional nylon, it also has white light, which can greatly meet its application in flexible display.

[0006] The first aspect of the present invention is to provide a nylon copolymer comprising a structural unit derived from a nylon monomer, a structural unit derived from an anthraquinone comonomer and a segment derived from a maleic anhydride copolymer;

[0007] The anthraquinone comonomer is selected from diaminoanthraquinone;

[0008] Based on the total mass of the nylon copolymer being 100%, the mass content of the structural unit derived from the anthraquinone comonomer in the nylon copolymer is not higher than 0.3%.

[0009] By using the above specific diaminoanthraquinone and the specific dosage ratio, the present invention unexpectedly found that a white nylon material (ie the above nylon copolymer) can be obtained.

[0010] The white light nylon material of the present invention, under the excitation of 365nm ultraviolet light, has three fluorescence emission peaks between 400-650nm in the visible light region and three phosphorescence emission peaks between 500-800nm ​​for the unannealed nylon copolymer.

[0011] Through fluorescence emission detection, the CIE color coordinates of the unannealed nylon copolymer of the white light nylon material of the present invention are close to white light. Through detection, it can be seen that the CIE color coordinates of the unannealed nylon copolymer of the present invention are within the range of (white light coordinate ±0.05, white light coordinate ±0.05).

[0012] According to the present invention, the anthraquinone comonomer is selected from diaminoanthraquinone; in a preferred embodiment of the present invention, the diaminoanthraquinone is at least one of 1,4-diaminoanthraquinone, 1,5-diaminoanthraquinone and 2,6-diaminoanthraquinone, preferably 2,6-diaminoanthraquinone.

[0013] According to the present invention, based on the total mass of the nylon copolymer being 100%, the mass content of the structural units derived from anthraquinone comonomers in the nylon copolymer is not higher than 0.3%; in a preferred embodiment of the present invention, based on the total mass of the nylon copolymer being 100%, the mass content of the structural units derived from anthraquinone comonomers in the nylon copolymer is 0.01%-0.3%, preferably 0.05%-0.1%.

[0014] In order to increase the molecular weight of nylon material and increase the fluorescence performance of nylon, maleic anhydride copolymer is preferably added to the monomer to regulate the molecular weight and fluorescence performance. According to the present invention, the maleic anhydride copolymer can be selected in a wide range. In a preferred embodiment of the present invention, the maleic anhydride copolymer is a maleic anhydride alternating copolymer, a maleic anhydride random copolymer, a maleic anhydride grafted copolymer, and more preferably at least one of a maleic anhydride styrene copolymer, a maleic anhydride vinyl ether copolymer, and a polypropylene grafted maleic anhydride.

[0015] According to the present invention, the number average molecular weight of the maleic anhydride copolymer can be selected within a wide range. In a preferred embodiment of the present invention, the number average molecular weight of the maleic anhydride copolymer is 100-200000, preferably 2000-20000.

[0016] According to the present invention, the molar ratio of the maleic anhydride groups in the chain segments derived from the maleic anhydride copolymer in the nylon copolymer to the structural units derived from the nylon monomer can be selected within a wide range. In a preferred embodiment of the present invention, the molar ratio of the maleic anhydride groups in the chain segments derived from the maleic anhydride copolymer in the nylon copolymer to the structural units derived from the nylon monomer is (0.01-1):100, preferably (0.02-0.2):100, and more preferably (0.02-0.1):100.

[0017] In the present invention, maleic anhydride group refers to

[0018] As described above, preferably, under 365nm ultraviolet light excitation, the unannealed nylon copolymer has three fluorescence emission peaks between 400-650nm in the visible light region, and three phosphorescence emission peaks between 500-800nm; and / or,

[0019] The CIE color coordinates of the unannealed nylon copolymer are close to white light through fluorescence emission detection.

[0020] According to the present invention, the nylon monomer is a conventional nylon monomer in the art, including but not limited to at least one of the nylon monomers having the following structure:

[0021] NH3-R7-NH3 formula (2-1);

[0022] R'OOC-R8-COOR" formula (2-2);

[0023] R”’OOC-R9-NH3 formula (2-3);

[0024]

[0025] NH3-R7'-NH4 + - - OOC-R8'-COOH formula (2-5);

[0026] In the above formulae (2-1) to (2-5), R7, R8, R7', R8', R9 and R10 are each independently preferably C1-C 20 One of aromatic hydrocarbons, straight-chain hydrocarbons or branched-chain alkanes;

[0027] In the above formula (2-2), R' and R" are independently selected from one of a hydrogen atom, a phenyl group, and a C1-C4 alkyl group; preferably one of H and a butyl group;

[0028] In the above formula (2-3), R'' is selected from a hydrogen atom, a phenyl group, and a C1-C4 alkyl group; preferably, it is selected from a H group and a butyl group.

[0029] In a preferred embodiment of the present invention, each of R7 and / or R7' is C3-C 12 Aromatic hydrocarbons, straight chain hydrocarbons or branched chain alkanes, preferably C4-C 10 Aromatic hydrocarbon, straight chain hydrocarbon or branched alkane, more preferably -(CH2)4-, -(CH2)6- or -(CH2) 10 -; and / or,

[0030] The R8 and / or R8' are each C1-C 10 An aromatic hydrocarbon, a straight-chain hydrocarbon group or a branched hydrocarbon group, preferably a C2-C8 straight-chain hydrocarbon group, more preferably -(CH2)2-, -(CH2)4- or -(CH2)8-; and / or,

[0031] R9 and / or R10 are each C3-C 12 A straight chain hydrocarbon group, preferably C3-C 10 A straight chain hydrocarbon group, more preferably -(CH2)3- or -(CH2)8-.

[0032] In a preferred embodiment of the present invention, when the nylon monomer contains monomers of formula (2-1) and formula (2-2), the molar ratio between the two monomers of formula (2-1) and formula (2-2) is 1:(0.9-1.1); and / or,

[0033] The nylon monomer contains at least one of the monomers of formula (2-3), formula (2-4) and formula (2-5); preferably at least one of caprolactam, aminocaproic acid and hexamethylenediammonium adipate.

[0034] In a preferred embodiment of the present invention, the segment derived from the nylon monomer has at least one of the following three structural units:

[0035]

[0036] Wherein, x, y, and z are the molar contents of the three structural units, and R1-R4 are each C1-C 18 A straight chain hydrocarbon or C1-C 18 Branched hydrocarbon group, C6-C 18 R3 and R4 do not have the same structure at the same time; preferably, x, y, z are each a molar ratio of a corresponding structural unit, x+y+z=1, x, y, z are all greater than or equal to 0; and / or R1 is -(CH2)4-, -(CH2)6- or -(CH2) 10-; and / or, R2 is -(CH2)2-, -(CH2)4- or -(CH2)8-; and / or, R3 and R4 are each -(CH2)5- or -(CH2) 10 -.

[0037] In the present invention, preferably, the structural formula of the polyamide segment is That is, the connection sequence of the structural units corresponding to x, y, and z is not particularly limited in the present invention. The polyamide copolymer in the present invention is a random copolymer.

[0038] The second aspect of the present invention is to provide a method for preparing the nylon copolymer described in the first aspect, comprising: copolymerizing a polymerization raw material including a nylon monomer, an anthraquinone comonomer and a maleic anhydride copolymer to obtain the nylon copolymer;

[0039] The anthraquinone comonomer is selected from diaminoanthraquinone;

[0040] Based on the total mass of the polymerization raw materials being 100%, the amount of the anthraquinone comonomer used is no more than 0.3%.

[0041] As described in the first aspect, in a preferred embodiment of the present invention, the diaminoanthraquinone is at least one of 1,4-diaminoanthraquinone, 1,5-diaminoanthraquinone and 2,6-diaminoanthraquinone.

[0042] In a preferred embodiment of the present invention, based on 100 wt% of the total mass of the polymerization raw materials, the amount of the anthraquinone comonomer is 0.01 wt%-0.3 wt%, preferably 0.05 wt%-0.1 wt%.

[0043] As described in the first aspect, the maleic anhydride copolymer can be selected from a wide range. In a preferred embodiment of the present invention, the maleic anhydride copolymer is a maleic anhydride alternating copolymer, a maleic anhydride random copolymer, a maleic anhydride grafted copolymer, and more preferably at least one of a maleic anhydride styrene copolymer, a maleic anhydride vinyl ether copolymer, and a polypropylene grafted maleic anhydride.

[0044] As described in the first aspect, the number average molecular weight of the maleic anhydride copolymer can be selected within a wide range. In a preferred embodiment of the present invention, the number average molecular weight of the maleic anhydride copolymer is 100-200000, preferably 2000-20000.

[0045] According to the present invention, in a preferred embodiment of the present invention, the molar ratio of maleic anhydride groups to nylon monomers in the chain segments of the maleic anhydride copolymer is (0.01-1):100, preferably (0.02-0.2):100, and more preferably (0.02-0.1):100.

[0046] The polymerization raw material used in the above polymerization reaction may also include water which is optionally added.

[0047] The polymerization of the polyamide copolymer of the present invention may be at least one of condensation, ring-opening polymerization, anionic polymerization and cationic polymerization, and the existing preparation conditions of the polyamide copolymer may be adopted.

[0048] In a preferred embodiment of the present invention, the polymerization reaction is in-situ polymerization.

[0049] The polymerization reaction is carried out under a protective atmosphere, which includes but is not limited to an inert atmosphere (nitrogen and / or an inert gas).

[0050] In a preferred embodiment of the present invention, the copolymerization is carried out under a protective atmosphere, and / or,

[0051] The polymerization reaction temperature is 240-260° C.; and / or,

[0052] Reaction time 0.5-24 hours; and / or,

[0053] The reaction pressure is 0-20 atmospheres; preferably,

[0054] The polymerization conditions include:

[0055] The anthraquinone comonomer, nylon monomer and maleic anhydride copolymer are reacted under a protective atmosphere at 240-260° C. with stirring for 0-3 hours; preferably, the reaction is carried out at 0-20 atmospheres for 0-6 hours, preferably 0-2 hours, and then the pressure is reduced to maintain the reaction temperature at 180-260° C., and then high vacuum is started, and the vacuum degree is further reduced to below 200 Pa for reaction.

[0056] More specifically, the polymerization method of the present invention is described using nylon 6 as an example:

[0057] The copolymer, nylon 6 monomer caprolactam and water are added into a reactor, and an inert gas is introduced therein to perform deoxygenation treatment;

[0058] The temperature is raised to 180-260° C. to carry out polymerization reaction, and the reaction temperature is finally controlled between 240 and 260° C. and stirred for reaction. The preferred stirring reaction time is 0-3 h.

[0059] During the reaction, the pressure can be maintained at 0-20 atmospheres, maintained at high vacuum for 0-6 hours, and then slowly reduced to maintain the reaction temperature at 180-260°C. Preferably, the low vacuum reaction time is 0-2h, and then high vacuum is started, and the vacuum degree is further reduced to 2000Pa, and the reaction is carried out for a certain time (for example, 0.5-2h). Preferably, the inert gas is nitrogen, and the deoxygenation treatment time is 30min.

[0060] The third aspect of the present invention is to provide a nylon copolymer as described in the first aspect, or a nylon copolymer prepared by the preparation method as described in the second aspect, for use in the fields of lighting, display and biosensor.

[0061] It has been verified that the CIE coordinates of the white light nylon product obtained by the present invention before annealing are very close to white light. Therefore, the nylon product A is expected to be used in the field of LED lighting, can absorb the blue-violet light of the LED light source, reduce the damage of blue light to the retina, and be used to manufacture lampshades and lamp tubes, etc. It will have a wide range of applications in the fields of lighting, display and biosensors.

[0062] Compared with the prior art, the advantages of the present invention are:

[0063] The nylon copolymer of the present invention is a flexible white light emitting material, which has both the excellent mechanical properties of nylon itself and good ductility and flexibility. Compared with conventional inorganic materials such as phosphors or organic light-emitting small molecule gels, the white light nylon copolymer of the present invention has incomparable advantages in mechanical properties. At the same time, the white light nylon copolymer of the present invention is simple to prepare, which is of great significance for promoting the practical application of flexible display devices.

[0064] The nylon copolymer of the present invention unexpectedly has white light compared to conventional nylon, and as a flexible white light emitting material with excellent mechanical properties, it has important significance for promoting the practical application of flexible display devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 are the fluorescence and phosphorescence emission spectra of the white light nylon product A obtained in Example 1 before and after annealing;

[0066] Figure 2 This is the CIE diagram of fluorescence emission of the white light nylon product A obtained in Example 1 before annealing. DETAILED DESCRIPTION

[0067] The present invention is described in detail below in conjunction with specific embodiments. It is necessary to point out that the following embodiments are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by those skilled in the art based on the contents of the present invention still fall within the scope of protection of the present invention.

[0068] The specific embodiments of the present invention are described in detail below.It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not intended to limit the present invention.The endpoints and any values ​​of the scope disclosed in this article are not limited to the precise scope or value, and these scopes or values ​​should be understood to include values ​​close to these scopes or values.For numerical ranges, between the endpoint values ​​of each scope, between the endpoint values ​​of each scope and a separate point value, and between separate point values, one or more new numerical ranges can be combined with each other, and these numerical ranges should be considered to be specifically disclosed in this article.

[0069] The microstructure of the polymer was measured using an AVANCE DRX400MHz nuclear magnetic resonance instrument from Bruker, Switzerland. The measurement was performed at room temperature using hydrogen nuclear magnetic resonance spectroscopy, the solvent was deuterated chloroform, and the sample concentration was 10 mg / mL.

[0070] The optical properties of nylon 6 were tested using the FLS 980 steady-state transient fluorescence spectrometer from Edinburgh, UK. The excitation light source for the fluorescence steady-state spectrum test was a xenon lamp, the fluorescence lifetime test used an LED laser or a supercontinuum laser as the light source, and the steady-state transient spectrum test of phosphorescence used a microsecond lamp as the light source, with gated operation. The detectors used were P928P PMT detectors. The total photoluminescence quantum yield and phosphorescence quantum yield were measured using the FLS 980 with an integrating sphere accessory. The excitation wavelengths for the fluorescence / phosphorescence steady-state spectrum and phosphorescence lifetime and total / phosphorescence quantum yield tests were all 365nm.

[0071] In the following examples, the maleic anhydride styrene copolymer is an alternating copolymer with a number average molecular weight of 2100 and a PDI of 1.2.

[0072] In the following examples, unless otherwise specified, the diaminoanthraquinone involved in the following examples and comparative examples is 2,6-diaminoanthraquinone.

[0073] Embodiment 1:

[0074] The test method is as follows:

[0075] 130g of caprolactam and 15g of aminocaproic acid were added to a 500mL three-necked flask, and nitrogen was introduced for deoxygenation for 30 minutes. 0.1g of diaminoanthraquinone and 0.1g of maleic anhydride styrene copolymer were added, and the reactor was heated to 260°C for hydrolysis and ring-opening reaction. After stirring for about 3 hours, vacuum was slowly drawn, and the reaction temperature was maintained at about 230°C. Low vacuum reaction was carried out for about 1 hour. After the excess water was drawn out, high vacuum was drawn, and the vacuum degree was further reduced to below 200Pa. The polycondensation reaction was carried out for 0.5 hours, and the white nylon product A was obtained.

[0076] For white nylon product A, Figure 1 The fluorescence and phosphorescence emission spectra of the pellets before and after annealing (annealing condition is 219℃ isothermal for one hour) are given. Under 365nm ultraviolet light excitation, the unannealed pellets have three fluorescence emission peaks at 430nm, 545nm and 582nm in the visible region, and three phosphorescence emission peaks at 550nm, 584nm and 635nm. After annealing, the peak positions of the fluorescence emission peaks remain basically unchanged, but the relative intensities of the three emission peaks have changed significantly; and the maximum emission wavelength of phosphorescence has blue-shifted to 546nm. Under the combined effect of fluorescence emission and phosphorescence emission, it is shown that nylon emits white light under the action of ultraviolet light.

[0077] Figure 2 The CIE graph of fluorescence emission of white light nylon product A before annealing is given. Before annealing, the CIE coordinates are (0.31, 0.34), which is very close to white light. Therefore, nylon product A is expected to be used in the field of LED lighting, absorbing the blue-violet light of LED light sources, reducing the damage of blue light to the retina, and can be used to manufacture lampshades and lamp tubes.

[0078] Example 2

[0079] 130g of caprolactam and 15g of aminocaproic acid were added to a 500mL three-necked flask, nitrogen was introduced for deoxygenation for 30 minutes, 0.05g of diaminoanthraquinone and 0.05g of styrene maleic anhydride copolymer were added, the reactor was heated to 260°C, hydrolysis and ring-opening reaction was carried out, and after stirring for about 3 hours, vacuum was slowly pumped, the reaction temperature was maintained at about 230°C, and low vacuum reaction was carried out for about 1 hour. After the excess water was pumped out, high vacuum was started, and the vacuum degree was further reduced to below 200Pa, and polycondensation reaction was carried out for 0.5 hours, and the white light nylon product B was obtained. Under the excitation of ultraviolet light, the CIE coordinates of the copolymer were (0.30, 0.35), close to white light.

[0080] Example 3

[0081] 130g of caprolactam and 15g of aminocaproic acid were added to a 500mL three-necked flask, nitrogen was introduced for deoxygenation for 30 minutes, 0.2g of diaminoanthraquinone and 0.2g of styrene maleic anhydride copolymer were added, the reactor was heated to 260°C, hydrolysis and ring-opening reaction was carried out, and after stirring for about 3 hours, vacuum was slowly pumped, the reaction temperature was maintained at about 230°C, and low vacuum reaction was carried out for about 1 hour. After the excess water was pumped out, high vacuum was started, and the vacuum degree was further reduced to below 200Pa, and polycondensation reaction was carried out for 0.5 hours, and the white light nylon product C was obtained. Under the excitation of ultraviolet light, the CIE coordinates of the copolymer were (0.29, 0.34), close to white light.

[0082] Example 4

[0083] The same as Example 1, except that the copolymer monomers are caprolactam and lauryl lactam, and the ratio of the two is 5:5. Under the excitation of ultraviolet light, the CIE coordinates of the copolymer are (0.30, 0.34), which is close to white light.

[0084] Example 5

[0085] The same as Example 1, except that the copolymer monomers are caprolactam, lauryl lactam and aminoundecanoic acid, and the ratio of the three is 3:4:3. Under the excitation of ultraviolet light, the CIE coordinates of the copolymer are (0.30, 0.34), which is close to white light.

[0086] It has been verified that by using other nylon monomers described in the present invention to replace the nylon monomer in Example 1 in Example 4 and Example 5, a white nylon product with similar optical properties to that in Example 1 can also be obtained.

[0087] Comparative Example 1

[0088] A nylon product was prepared according to the method of Example 1, except that 3-aminofluoranthene was used instead of the diaminoanthraquinone in Example 1.

[0089] The optical properties of the obtained nylon product were tested in the same manner as in Example 1, and it was found that the fluorescence emission peak was at 536 nm, the sample was brownish yellow, and did not have the characteristics of white light.

[0090] Comparative Example 2

[0091] The nylon product was prepared according to the method of Example 1, and the addition amount of different diaminoanthraquinones was 0.5 g. The optical properties of the obtained nylon product were tested in the same way as in Example 1, and it was found that the fluorescence emission peaks were at 590 and 650 nm, the phosphorescence emission was at 620 nm, and the sample was dark red, and did not have the characteristics of white light.

[0092] Comparative Example 3

[0093] The same as Example 1, except that no maleic anhydride styrene copolymer is added. Under the excitation of ultraviolet light, the copolymer still has a fluorescence emission peak at 572nm and a phosphorescence at 555nm in the visible region, showing a brown effect, and does not have the characteristics of white light.

[0094] It should be noted that the embodiments described above are only used to explain the present invention and do not constitute any limitation to the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present invention may be modified as specified within the scope of the claims of the present invention, and the present invention may be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein, on the contrary, the present invention can be extended to all other methods and applications with the same functions.

[0095] All publications, patent applications, patents and other references mentioned in this specification are incorporated herein by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings conventionally understood by those skilled in the art. In the event of a conflict, the definition in this specification shall prevail.

[0096] When this specification uses the prefix "well-known to those skilled in the art", "prior art" or similar terms to introduce materials, substances, methods, steps, devices or components, etc., the objects introduced by the prefix cover those commonly used in the art when this application is filed, but also include those that are not commonly used at present but will become recognized in the art as being suitable for similar purposes.

[0097] The endpoints and any values ​​of the scope disclosed in the present application document are not limited to the precise scope or value, and these scopes or values ​​should be understood to include values ​​close to these scopes or values. For numerical ranges, between the endpoint values ​​of each scope, between the endpoint values ​​of each scope and a separate point value, and between separate point values, one or more new numerical ranges can be combined with each other, and these numerical ranges should be considered as specifically disclosed in this article. Hereinafter, in principle, each technical solution can be combined with each other to obtain a new technical solution, which should also be considered as specifically disclosed in this article.

[0098] In the context of the present specification, any matters or items not mentioned are directly applicable to those known in the art without any changes except those explicitly stated.

[0099] Moreover, any embodiment described in this document may be freely combined with one or more other embodiments described in this document, and the technical solutions or technical ideas formed thereby are deemed to be part of the original disclosure or original record of the present invention, and should not be regarded as new content that has not been disclosed or anticipated in this document, unless a person skilled in the art considers that the combination is obviously unreasonable.

Claims

1. A nylon copolymer comprising a structural unit derived from a nylon monomer, a structural unit derived from an anthraquinone comonomer and a segment derived from a maleic anhydride copolymer; The anthraquinone comonomer is selected from diaminoanthraquinone; Based on the total mass of the nylon copolymer being 100%, the mass content of the structural unit derived from the anthraquinone comonomer in the nylon copolymer is not higher than 0.3%.

2. The nylon copolymer according to claim 1, characterized in that: The diaminoanthraquinone is at least one of 1,4-diaminoanthraquinone, 1,5-diaminoanthraquinone and 2,6-diaminoanthraquinone; and / or, Based on the total mass of the nylon copolymer being 100%, the mass content of the structural unit derived from the anthraquinone comonomer in the nylon copolymer is 0.01%-0.3%, preferably 0.05%-0.1%.

3. The nylon copolymer according to claim 1, characterized in that: The maleic anhydride copolymer is a maleic anhydride alternating copolymer, a maleic anhydride random copolymer, a maleic anhydride grafted copolymer, and more preferably at least one of a maleic anhydride styrene copolymer, a maleic anhydride vinyl ether copolymer, and a polypropylene grafted maleic anhydride; and / or, The number average molecular weight of the maleic anhydride copolymer is 100-200000, preferably 2000-20000; and / or, The molar ratio of the maleic anhydride groups in the chain segments derived from the maleic anhydride copolymer in the nylon copolymer to the structural units derived from the nylon monomer is (0.01-1):100, preferably (0.02-0.2):100, and more preferably (0.02-0.1):

100.

4. The nylon copolymer according to any one of claims 1 to 3, characterized in that: Under 365nm ultraviolet light excitation, the unannealed nylon copolymer has three fluorescence emission peaks between 400-650nm in the visible light region, and three phosphorescence emission peaks between 500-800nm; and / or, The CIE color coordinates of the unannealed nylon copolymer are close to white light through fluorescence emission detection.

5. The nylon copolymer according to any one of claims 1 to 3, characterized in that: The nylon monomer is at least one of monomers having the following structure: NH3-R7-NH3 formula (2-1); R'OOC-R8-COOR" formula (2-2); R"'OOC-R9-NH3 formula (2-3); NH3-R7'-NH4 + - - OOC-R8'-COOH formula (2-5); In the above formulae (2-1) to (2-5), R7, R8, R7', R8', R9 and R10 are each independently preferably C1-C 20 One of aromatic hydrocarbons, straight-chain hydrocarbons or branched-chain alkanes; In the above formula (2-2), R' and R" are independently selected from one of a hydrogen atom, a phenyl group, and a C1-C4 alkyl group; preferably one of H and a butyl group; In the above formula (2-3), R'' is selected from a hydrogen atom, a phenyl group, and a C1-C4 alkyl group; preferably, it is selected from a H group and a butyl group.

6. The nylon copolymer according to claim 5, characterized in that: The R7 and / or R7' are each C3-C 12 Aromatic hydrocarbons, straight chain hydrocarbons or branched chain alkanes, preferably C4-C 10 Aromatic hydrocarbon, straight chain hydrocarbon or branched alkane, more preferably -(CH2)4-, -(CH2)6- or -(CH2) 10 -; and / or, The R8 and / or R8' are each C1-C 10 An aromatic hydrocarbon, a straight-chain hydrocarbon group or a branched hydrocarbon group, preferably a C2-C8 straight-chain hydrocarbon group, more preferably -(CH2)2-, -(CH2)4- or -(CH2)8-; and / or, R9 and / or R10 are each C3-C 12 A straight chain hydrocarbon group, preferably C3-C 10 A straight chain hydrocarbon group, more preferably -(CH2)3- or -(CH2)8-.

7. The nylon copolymer according to claim 5, characterized in that: When the nylon monomer contains monomers of formula (2-1) and formula (2-2), the molar ratio between the two monomers of formula (2-1) and formula (2-2) is 1:(0.9-1.1); and / or, The nylon monomer contains at least one of the monomers of formula (2-3), formula (2-4) and formula (2-5); preferably at least one of caprolactam, aminocaproic acid and hexamethylenediammonium adipate.

8. The method for preparing a nylon copolymer according to any one of claims 1 to 7, comprising: Copolymerizing a polymerization raw material including a nylon monomer, an anthraquinone comonomer and a maleic anhydride copolymer to obtain the nylon copolymer; The anthraquinone comonomer is selected from diaminoanthraquinone; Based on the total mass of the polymerization raw materials being 100 wt %, the amount of the anthraquinone comonomer used is no more than 0.3 wt %.

9. The preparation method according to claim 8, characterized in that: The diaminoanthraquinone is at least one of 1,4-diaminoanthraquinone, 1,5-diaminoanthraquinone and 2,6-diaminoanthraquinone; and / or, Based on the total mass of the polymerization raw materials being 100 wt %, the amount of the anthraquinone comonomer used is 0.01 wt % to 0.3 wt %, preferably 0.05 wt % to 0.1 wt %.

10. The preparation method according to claim 8, characterized in that: The number average molecular weight of the maleic anhydride copolymer is 100-200000, preferably 2000-20000; and / or, The molar ratio of maleic anhydride groups to nylon monomers in the chain segments of the maleic anhydride copolymer is (0.01-1):100, preferably (0.02-0.2):100, and more preferably (0.02-0.1):

100.

11. The preparation method according to any one of claims 8 to 10, characterized in that: The copolymerization is carried out under a protective atmosphere, and / or, The polymerization reaction temperature is 240-260° C.; and / or, Reaction time 0.5-24 hours; and / or, The reaction pressure is 0-20 atmospheres.

12. Use of the nylon copolymer according to any one of claims 1 to 7, or the nylon copolymer prepared according to the preparation method according to any one of claims 8 to 11 in the fields of lighting, display and biosensor.

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