A luminous PVC material and its preparation method and application

Abstract

The present invention relates to a luminous PVC material and a preparation method and application thereof. The luminous PVC material comprises the following components by weight: 40 to 85 parts of PVC resin and 4 to 20 parts of a long afterglow compound. The luminous PVC material has high brightness, and can still emit brightness discernible to the human eye 60 minutes after excitation, and the luminescence duration is long.

Description

Technical Field

[0001] The present invention relates to the technical field of general plastics, and more specifically, to a luminous PVC material and a preparation method and application thereof. Background Art

[0002] Long afterglow luminescent materials are also known as light-storage materials, energy-storage luminescent materials or luminous materials. They are often used in lighting, safety signs and other fields or scenes. Long afterglow luminescent materials have unique advantages in the conversion and utilization of light energy. They can store light energy and slowly release it in a dark environment. They are an important type of light-to-light conversion material and energy-saving material. Long afterglow PVC materials are generally made by adding long afterglow pigments to PVC, stirring them in a high-speed mixer, and then melt-extruded to make long afterglow PVC materials. However, since long afterglow pigments are generally composed of inorganic substances such as matrix, activator and trap center, they are easily sheared by the equipment during the stirring and extrusion process of the PVC processing process, causing the long afterglow pigment structure to be destroyed, and the displayed surface color to darken, resulting in a long duration of long afterglow and poor long afterglow effect.

[0003] The Chinese patent entitled "A long afterglow PVC paint film and its preparation method" achieves a long afterglow effect by applying a luminous coating on the PVC film, but in fact only the luminous coating on the surface of the PVC film is effective, and PVC itself does not have a long afterglow effect.

[0004] Therefore, it is necessary to solve the problems of low brightness and short duration of long afterglow of current long afterglow PVC materials. Summary of the invention

[0005] The primary purpose of the present invention is to overcome the problems of low brightness and short duration of long afterglow PVC materials currently available, and to provide a luminescent PVC material. The luminescent PVC material has high brightness, can still emit brightness discernible to the human eye 60 minutes after excitation, and has a long duration of luminescence.

[0006] A further object of the present invention is to provide a method for preparing the above-mentioned luminous PVC material.

[0007] A further object of the present invention is to provide the use of the above-mentioned luminescent PVC material in the preparation of luminescent products.

[0008] The above-mentioned object of the present invention is achieved by the following technical solutions:

[0009] A luminous PVC material comprises the following components in parts by weight:

[0010] PVC resin 40-85 parts,

[0011] 4-20 parts of long afterglow compound,

[0012] The long afterglow composite is composed of a first long afterglow pigment and a second long afterglow pigment in a mass ratio of 1:(0.5-1.5); the mass ratio of the first long afterglow pigment to the second long afterglow pigment can specifically be 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4 or 1:1.5.

[0013] The D50 particle size of the first long afterglow pigment is 10-50 μm, and the D50 particle size of the second long afterglow pigment is 100-310 μm. The D50 particle size of the long afterglow pigment can be measured by a laser particle size analyzer.

[0014] The D50 particle size of the first long afterglow pigment can be specifically selected as 10 μm, 11 μm, 20 μm, 30 μm, 40 μm or 50 μm; the D50 particle size of the second long afterglow pigment can be specifically selected as 100 μm, 150 μm, 200 μm, 250 μm, 300 μm or 310 μm.

[0015] In the present invention, PVC resin is used as the main resin, and its content accounts for more than 35% of the luminescent PVC material. In the luminescent PVC material, the amount of PVC resin added can be 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts or 85 parts; the amount of long afterglow compound added can be 4 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts or 20 parts.

[0016] The inventor of the present invention has found through multiple studies that compounding the first long afterglow pigment and the second long afterglow pigment of a specific D50 particle size and then adding them to the luminescent PVC material can make the luminescent PVC material have high brightness, and can still emit brightness discernible to the human eye 60 minutes after excitation, and the luminescence duration is long. The reason may be: generally speaking, the particle size of the second long afterglow pigment is large, and the long afterglow duration should be long, but its shear resistance is poor, and its structure is easily destroyed by shearing during the melt extrusion process, resulting in its duration is not long, and when the first long afterglow pigment and the second long afterglow pigment are added at the same time, the first long afterglow pigment with a smaller particle size can protect the second long afterglow pigment with a larger particle size through the size effect, and the structure of the second long afterglow pigment is not easily destroyed by shearing, and the first long afterglow pigment with a smaller particle size has good dispersibility in the material, and the color appears lighter. The combination of the two can not only make the initial brightness of the luminescent PVC material high, but also can significantly extend the luminescence duration of the luminescent PVC material.

[0017] Preferably, the luminous PVC material comprises the following components in parts by weight:

[0018] 50-70 parts of PVC resin,

[0019] 6 to 14 parts of long afterglow compound.

[0020] Optionally, the average polymerization degree of the PVC resin is 400-2500.

[0021] The average degree of polymerization of the PVC resin of the present invention can be measured according to GB / T 5761-2018.

[0022] Preferably, the average polymerization degree of the PVC resin is 400-1000.

[0023] More preferably, the average polymerization degree of the PVC resin is 400-500.

[0024] By regulating the average degree of polymerization of PVC resin, the initial brightness of the luminescent PVC material can be made higher and the luminescence time longer.

[0025] Typically, the particle size distribution of the first long afterglow pigment is D50±3 μm, and the particle size distribution of the second long afterglow pigment is D50±15 μm (it should be understood that D50 refers to the D50 particle size). The particle size distribution can be measured by a laser particle size analyzer.

[0026] Preferably, the D50 particle size of the second long afterglow pigment is 100-200 μm. By adjusting the D50 particle size of the second long afterglow pigment within a smaller range, the number of pigment particles can be increased at the same dosage, thereby making the initial brightness of the luminescent PVC material higher and the luminescence time longer.

[0027] Preferably, the long afterglow compound accounts for 7.5-15wt% of the luminescent PVC material, and the content of the long afterglow compound in the overall luminescent PVC material is regulated so that when the content of the long afterglow compound is not too low, the shear damage suffered during the melt extrusion process is less, thereby making the initial brightness of the luminescent PVC material higher and the luminescence time longer.

[0028] Generally, the preparation process of the long afterglow composite is as follows: firstly, a first long afterglow pigment and a second long afterglow pigment are mixed to obtain a long afterglow composite.

[0029] Preferably, the long afterglow compound is a long afterglow compound with a surface modified with a silane coupling agent. The long afterglow compound is further modified with a silane coupling agent, so that the first long afterglow pigment has a more obvious protective effect on the second long afterglow pigment, has better shear resistance, and both have better dispersion in the luminescent PVC material, thereby significantly improving the brightness of the luminescent PVC material and extending the duration of luminescence.

[0030] Generally, the preparation process of the surface-modified silane coupling agent long afterglow composite is as follows: the long afterglow composite is mixed with the silane coupling agent to obtain the surface-modified silane coupling agent long afterglow composite. Preferably, the mixing method is: the silane coupling agent is mixed with the long afterglow composite in the form of a spray.

[0031] Generally, in the long afterglow composite material, the mass ratio of the first long afterglow pigment and the second long afterglow pigment to the silane coupling agent is 1:(0.015-0.027).

[0032] Optionally, the first long afterglow pigment is at least one of a sulfide system long afterglow pigment, an aluminate system long afterglow pigment, a silicate system long afterglow pigment, a phosphate system long afterglow pigment, a gallate system long afterglow pigment, a germanate system long afterglow pigment or a nitride system long afterglow pigment.

[0033] Preferably, the first long afterglow pigment is an aluminate system long afterglow pigment, specifically, it may be at least one of a strontium aluminate system, a calcium aluminate system or a barium aluminate system.

[0034] Optionally, the second long afterglow pigment is at least one of a sulfide system long afterglow pigment, an aluminate system long afterglow pigment, a silicate system long afterglow pigment, a phosphate system long afterglow pigment, a gallate system long afterglow pigment, a germanate system long afterglow pigment or a nitride system long afterglow pigment.

[0035] Preferably, the second long afterglow pigment is an aluminate system long afterglow pigment, specifically, it may be at least one of a strontium aluminate system, a calcium aluminate system or a barium aluminate system.

[0036] Optionally, the silane coupling agent is at least one of a sulfur-containing silane coupling agent, an amino-containing silane coupling agent or an epoxy-containing silane coupling agent.

[0037] Preferably, the silane coupling agent is an epoxy-containing silane coupling agent, specifically 3-glycidyloxypropyltrimethoxysilane.

[0038] Preferably, the luminous PVC material further comprises 10 to 50 parts of plasticizer.

[0039] Adding plasticizers can improve the mechanical properties of luminous PVC materials and meet more application scenarios.

[0040] Optionally, the plasticizer is at least one of epoxy plasticizers, terephthalate plasticizers, phthalate plasticizers, cyclohexanedicarboxylate plasticizers, citrate plasticizers, trimellitate plasticizers or phosphate plasticizers.

[0041] Preferably, the luminous PVC material further comprises 0.9 to 5 parts of a stabilizer.

[0042] Optionally, the stabilizer includes but is not limited to at least one of a calcium zinc stabilizer, an organic tin stabilizer, an organic phosphite, epoxidized soybean oil, hydrotalcite or calcium oxide.

[0043] Preferably, the luminous PVC material further comprises 1 to 7 parts of other additives.

[0044] Optionally, the other auxiliary agents include but are not limited to lubricants.

[0045] Usually, the amount of lubricant added is 0.1 to 2 parts.

[0046] Optionally, the lubricant includes but is not limited to at least one of a stearate lubricant, a fatty acid lubricant or a stearate lubricant.

[0047] Further optionally, the stearate lubricant includes but is not limited to at least one of calcium stearate, magnesium stearate or zinc stearate.

[0048] Further optionally, the fatty acid lubricant includes but is not limited to at least one of fatty acids, fatty acid derivatives, and fatty acid esters.

[0049] Further optionally, the stearate lubricant includes but is not limited to at least one of glyceryl monostearate or pentaerythritol stearate.

[0050] The preparation method of the luminous PVC material comprises the following steps: mixing the components, melt-extruding, and granulating to obtain the luminous PVC material.

[0051] Typically, the melt extrusion temperature is 100-170°C.

[0052] The application of the above-mentioned luminescent PVC material in the preparation of luminescent products also falls within the protection scope of the present invention.

[0053] Preferably, the luminous product is an LED light strip, a fire safety sign, a toy or a gift.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] The luminous PVC material of the invention has high brightness, can still emit brightness discernible to human eyes 60 minutes after being excited, and has a long luminous duration. DETAILED DESCRIPTION

[0056] In order to more clearly and completely describe the technical solution of the present invention, the present invention is further described in detail through specific embodiments below. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention. Various changes can be made within the scope of the rights of the present invention.

[0057] Some of the reagents selected in the embodiments and comparative examples of the present invention are described as follows:

[0058] PVC resin 1#: Formosa Plastics Industry (Ningbo) Co., Ltd., PVC S-50, average degree of polymerization 485;

[0059] PVC resin 2#: Tianjin LG Bohai Chemical Co., Ltd., PVC TL-1000, average degree of polymerization 1000;

[0060] PVC resin 3#: Formosa Plastics Industry (Ningbo) Co., Ltd., PVC S-85, average degree of polymerization 2480;

[0061] The first long afterglow pigment 1#: Zhejiang Minghui Luminescent Technology Co., Ltd., MHG-6E, D50 particle size 5-15μm, aluminate system long afterglow pigment; sieving treatment is performed before preparing luminescent PVC materials: the particle size range is selected through the sieve, the upper mesh number during sieving is 1000 mesh, the lower mesh number is 1340 mesh, and the D50 particle size of the pigment between the upper and lower sieves is 11μm (measured by a laser particle size analyzer, the same below), and the particle size distribution is 10-13μm (measured by a laser particle size analyzer, the same below);

[0062] The first long afterglow pigment 2#: Zhejiang Minghui Luminescent Technology Co., Ltd., MHG-6C, D50 particle size 50-65μm, aluminate system long afterglow pigment; used for sieving before preparing luminous PVC materials: the particle size range is selected through the sieve, the upper mesh number during sieving is 270 mesh, the lower mesh number is 300 mesh, and the D50 particle size of the pigment between the upper and lower sieves is 50μm, and the particle size distribution is 48-53μm;

[0063] The first long afterglow pigment 3#: Dalian Luming Technology Group Co., Ltd., SB-8C, D50 particle size 10-30μm, silicate system long afterglow pigment; used for sieving before preparing luminous PVC materials: the particle size range is selected through the sieve, the upper mesh number during sieving is 600 mesh, the lower mesh number is 800 mesh, and the D50 particle size of the pigment between the upper and lower sieves is 20μm, and the particle size distribution is 18-23μm;

[0064] The first long afterglow pigment 4#: Zhejiang Minghui Luminescent Technology Co., Ltd., MSGG-4D, D50 particle size 10-30μm, sulfide system long afterglow pigment; used for sieving before preparing luminous PVC materials: the particle size range is selected through the sieve, the upper mesh number during sieving is 1000 mesh, the lower mesh number is 1340 mesh, and the D50 particle size of the pigment between the upper and lower sieves is 11μm, and the particle size distribution is 10-13μm;

[0065] The second long afterglow pigment 1#: Zhejiang Minghui Luminescent Technology Co., Ltd., MCB-5B, D50 particle size 65-100μm, aluminate system long afterglow pigment; used for sieving before preparing luminous PVC materials: the particle size range is selected through the sieve, the upper mesh number during sieving is 150 mesh, the lower mesh number is 160 mesh, and the D50 particle size of the pigment between the upper and lower sieves is 100μm, and the particle size distribution is 96-106μm;

[0066] The second long afterglow pigment 2#: Zhejiang Minghui Luminescent Technology Co., Ltd., MCG-6BA, D50 particle size 150-300μm, aluminate system long afterglow pigment; used for sieving before preparing luminous PVC materials: the particle size range is selected through the sieve, the upper mesh number during sieving is 45 mesh, the lower mesh number is 48 mesh, and the D50 particle size of the pigment between the upper and lower sieves is 310μm, and the particle size distribution is 300-325μm;

[0067] The second long afterglow pigment 3#: Zhejiang Minghui Luminescent Technology Co., Ltd., MCG-6BA, D50 particle size 150-300μm, aluminate system long afterglow pigment; used for sieving before preparing luminous PVC materials: the particle size range is selected through the sieve, the upper mesh number during sieving is 70 mesh, the lower mesh number is 80 mesh, and the D50 particle size of the pigment between the upper and lower sieves is 200μm, and the particle size distribution is 180-212μm;

[0068] The second long afterglow pigment 4#: Shenzhen Xiangcai Chemical, XC220#, D50 particle size 795~805μm, aluminate system long afterglow pigment; sieving treatment is performed before preparing luminous PVC materials: the particle size range is selected through the sieve, the upper mesh number during sieving is 20 meshes, and the lower mesh number is 24 meshes, and the D50 particle size of the pigment between the upper and lower sieves is 800μm, and the particle size distribution is 700~830μm.

[0069] Silane coupling agent: Jingzhou Jianghan Fine Chemical Co., Ltd., JH-0187, silane coupling agent;

[0070] Long afterglow compounds 1#~13#, homemade;

[0071] Among them, the preparation method of long afterglow composites 1#~11# is as follows: weigh each component according to the formula in Table 1; first mix two long afterglow pigments with different D50 particle sizes evenly, and then use an atomizer to spray the silane coupling agent evenly on the long afterglow pigment, and stir the long afterglow pigment at a low speed while spraying to obtain a long afterglow composite.

[0072] The preparation method of long afterglow composites 12#~13# is as follows: weigh each component according to the formula in Table 1; then use an atomizer to spray the silane coupling agent evenly on the long afterglow pigment, and stir the long afterglow pigment at a low speed while spraying to obtain the long afterglow composite.

[0073] Table 1 Formula of long afterglow composite (parts by weight)

[0074]

[0075]

[0076] Plasticizer: BASF, PALATINOL 10-P, di(2-propylheptyl)phthalate;

[0077] Lubricant: Calcium stearate. Commercially available;

[0078] Stabilizer: Singapore Samick, SAK-CZL57-NP, calcium zinc composite stabilizer.

[0079] Unless otherwise specified, the components (such as lubricants) selected in the parallel embodiments and comparative examples are all the same commercially available products.

[0080] The luminescent PVC materials of the embodiments of the present invention and the comparative examples are prepared by the following preparation method:

[0081] Weigh each component according to the formula; first mix the PVC resin with the stabilizer (if any); then add the plasticizer and mix (if any); then add the lubricant and mix (if any); finally add the long afterglow compound, mix, melt extrude through an extruder (the temperature is set at 100-110°C), granulate, and obtain the luminous PVC material. Among them, the temperature of the first zone of the extruder is 100°C, the temperature of the second zone is 170°C, the temperature of the third zone is 170°C, the temperature of the fourth zone is 170°C, the temperature of the fifth zone is 170°C, the temperature of the sixth zone is 170°C.

[0082] The luminous PVC materials provided in the embodiments and comparative examples of the present invention were tested for performance according to the following test method: the luminous PVC materials were respectively injection molded into 50 mm × 80 mm × 2 mm flat plates, and the luminous brightness test conditions were: D65 standard light source, illumination 1000LX, excitation 10min, and then the afterglow fluorescent material light variable characteristic test system was used to measure the long afterglow brightness, and the measurement result unit was candela / square meter [cd / m 2 ], 1cd / m 2 =1000mcd / m 2 The larger the value, the higher the brightness; measure the brightness of each sample at 1min, 10min, 30min and 60min after the excitation to measure the duration of long afterglow.

[0083] Examples 1 to 16

[0084] Examples 1 to 16 provide a series of luminous PVC materials, whose formulas are shown in Tables 2 and 3.

[0085] Table 2 Formulas of Examples 1 to 8 (parts by weight)

[0086]

[0087]

[0088] Table 3 Formulas of Examples 9 to 16 (parts by weight)

[0089]

[0090] Embodiment 17

[0091] This embodiment provides a luminescent PVC material, and its preparation method and formula are basically the same as those of Example 1, except that: the long afterglow composite 1# is not modified with a silane coupling agent; that is, after the first long afterglow pigment 1# and the second long afterglow pigment 1# are mixed in a mass ratio of 1:1, no subsequent silane coupling agent modification is performed, and they are directly used in the preparation of the luminescent PVC material (the amount used is also 8 parts by weight).

[0092] Comparative Example 1

[0093] This comparative example provides a PVC material, whose preparation method and formula are basically the same as those of Example 1, except that: no long afterglow compound 1# is added.

[0094] Comparative Example 2

[0095] This comparative example provides a luminescent PVC material, the preparation method and formula of which are substantially the same as those of Example 1, except that the long afterglow compound 1# is replaced by the long afterglow compound 10#.

[0096] Comparative Example 3

[0097] This comparative example provides a luminescent PVC material, the preparation method and formula of which are substantially the same as those of Example 1, except that the long afterglow compound 1# is replaced by the long afterglow compound 11#.

[0098] Comparative Example 4

[0099] This comparative example provides a luminescent PVC material, the preparation method and formula of which are substantially the same as those of Example 1, except that the long afterglow compound 1# is replaced by the long afterglow compound 12#.

[0100] Comparative Example 5

[0101] This comparative example provides a luminescent PVC material, the preparation method and formula of which are substantially the same as those of Example 1, except that the long afterglow compound 1# is replaced by the long afterglow compound 13#.

[0102] Comparative Example 6

[0103] This comparative example provides a luminescent PVC material, the preparation method and formula of which are basically the same as those of Example 1, except that: the long afterglow compound 1# is replaced with an equal amount of long afterglow pigment A;

[0104] Long afterglow pigment A is self-made, and the process is as follows: take 2 parts by weight of the second long afterglow pigment 1# (Zhejiang Minghui Luminescent Technology Co., Ltd., MCB-5B, D50 particle size 65-100 μm, aluminate system long afterglow pigment) without sieving, and take 0.04 parts by weight of silane coupling agent without sieving; use an atomizing device to spray the silane coupling agent evenly on the long afterglow pigment, and stir the long afterglow pigment at a low speed while spraying to obtain long afterglow pigment A.

[0105] The properties of the luminous PVC material / PVC material of each embodiment and comparative example were tested according to the above-mentioned test method. The test results are shown in Table 4.

[0106] Table 4 Performance test results of various embodiments and comparative examples

[0107]

[0108]

[0109] From Table 4, we can see that:

[0110] The brightness of the luminescent PVC materials of Examples 1 to 17 reaches 2500 mcd / m in the first minute after excitation. 2 Above, the brightness reaches 24mcd / m at the 10th minute 2Above, the brightness at 30 minutes reaches 3.5mcd / m 2 Above, the brightness at 60 minutes reaches 0.5mcd / m 2 Among them, the brightness emitted at the 60th minute is still higher than the brightness that the human eye can discern (the lowest brightness visible to the human eye is 0.32mcd / m 2 ). The above indicates that the luminescent PVC material of the present invention has high luminescent brightness and long luminescent duration.

[0111] It can be seen from Examples 1 and 6 that the brightness of the luminous PVC material of Example 1 is higher than that of Example 6 at each time point. The reason may be that Example 1 adds plasticizer and lubricant, both of which have a certain protective effect on the long afterglow pigment with a larger particle size, so that the destructive effect caused by shearing is further reduced, and the brightness of the obtained material is higher, and the luminescence lasts longer.

[0112] It can be seen from Examples 1, 7 and 8 that the existing commonly used PVC resins with different polymerization degrees can be used in the present invention, and when the polymerization degree is adjusted to 400-1000, the brightness and luminous duration of the material are better.

[0113] From Examples 1 and 13, it can be seen that when long afterglow pigments of different systems are used, the luminous brightness of the luminescent PVC material is higher and the duration is longer; among them, when the first long afterglow pigment and the second long afterglow pigment are both aluminate system long afterglow pigments (Example 1), the luminous brightness is higher and the duration is longer.

[0114] From Examples 1 and 17, it can be seen that after the long afterglow composite is modified with a silane coupling agent (Example 1), the brightness of the luminescent PVC material is significantly improved, and the luminescence duration is longer. Specifically, from Examples 1 to 16, it can be seen that after the long afterglow composite is modified with a silane coupling agent, the brightness of the luminescent PVC material reaches 5000 mcd / m in the first minute after excitation. 2 Above, the brightness of the 10th minute reaches 600mcd / m 2 Above, the brightness reaches 180mcd / m at 30 minutes 2 Above, the brightness reaches 15mcd / m at 60 minutes 2 Among them, the brightness emitted at the 60th minute is still far higher than the brightness discernible by the human eye.

[0115] Comparative Example 1 does not add the long afterglow compound, and has no luminous effect. The D50 particle size of one of the long afterglow pigments in the long afterglow compounds selected in Comparative Examples 2 and 3 is not appropriate, and the brightness of the obtained luminous PVC material is low. It can no longer emit brightness discernible to the human eye at 60 minutes, and the duration is short. The long afterglow compounds of Comparative Example 4 all use long afterglow pigments with small particle sizes, and the luminous brightness of the obtained luminous PVC material at 1 minute is 2355mcd / m 2 The brightness is low, and after 60 minutes, it can no longer emit brightness that can be discerned by the human eye, and the duration is short. The long afterglow composite of Comparative Example 5 uses a long afterglow pigment with a large particle size, and the luminous PVC material obtained has a luminous brightness of 1502mcd / m 2 The brightness is low, and it can no longer emit brightness that can be discerned by the human eye after 60 minutes, and the duration is short. The long afterglow pigment added in Comparative Example 6 has not been sieved, and its D50 particle size is not within the appropriate range. The luminous brightness of the obtained luminous PVC material in 1 minute is 1955mcd / m 2 The brightness is low and it can no longer emit brightness discernible to the human eye after 60 minutes, and the duration is short.

[0116] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A luminous PVC material, characterized in that: The composition comprises the following components in parts by weight: PVC resin 40~85 parts, 4~20 parts of long afterglow compound, The long afterglow composite is composed of a first long afterglow pigment and a second long afterglow pigment in a mass ratio of 1: (0.5-1.5); The D50 particle size of the first long afterglow pigment is 10-50 μm, and the D50 particle size of the second long afterglow pigment is 100-310 μm.

2. The luminous PVC material according to claim 1, characterized in that: The polymerization degree of the PVC resin is 400-2500.

3. The luminous PVC material according to claim 2, characterized in that: The polymerization degree of the PVC resin is 400-1000.

4. The luminous PVC material according to claim 3, characterized in that: The polymerization degree of the PVC resin is 400-500.

5. The luminous PVC material according to claim 1, characterized in that: The long afterglow compound is a long afterglow compound with a surface modified with a silane coupling agent.

6. The luminous PVC material according to claim 5, characterized in that: In the long afterglow composite of the surface-modified silane coupling agent, the mass ratio of the first long afterglow pigment and the second long afterglow pigment to the silane coupling agent is 1:(0.015-0.027).

7. The luminous PVC material according to claim 1, characterized in that: The first long afterglow pigment is at least one of a sulfide system long afterglow pigment, an aluminate system long afterglow pigment, a silicate system long afterglow pigment, a phosphate system long afterglow pigment, a gallate system long afterglow pigment, a germanate system long afterglow pigment or a nitride system long afterglow pigment.

8. The luminous PVC material according to claim 7, characterized in that: The first long afterglow pigment is an aluminate system long afterglow pigment.

9. The luminous PVC material according to claim 1, characterized in that: The second long afterglow pigment is at least one of a sulfide system long afterglow pigment, an aluminate system long afterglow pigment, a silicate system long afterglow pigment, a phosphate system long afterglow pigment, a gallate system long afterglow pigment, a germanate system long afterglow pigment or a nitride system long afterglow pigment.

10. The luminous PVC material according to claim 9, characterized in that: The second long afterglow pigment is an aluminate system long afterglow pigment.

11. The luminous PVC material according to claim 1, characterized in that: The luminous PVC material also includes 10 to 50 parts of plasticizer.

12. The luminous PVC material according to claim 1, characterized in that: The luminous PVC material also includes 0.9 to 5 parts of a stabilizer.

13. The method for preparing the luminescent PVC material according to any one of claims 1 to 12, characterized in that: The method comprises the following steps: mixing the components, melting and extruding, and granulating to obtain the luminous PVC material.

14. Use of the luminescent PVC material according to any one of claims 1 to 12 in the preparation of luminescent products.

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