Fluorescent plastic part as well as preparation method and application thereof

Abstract

The invention provides a fluorescent plastic part and a preparation method and application thereof.The fluorescent plastic part comprises a resin base material, filler and resin-based fluorescent fiber dots, raw materials of the resin-based fluorescent fiber dots comprise transparent resin and noctilucent powder, the lowest processing temperature of the transparent resin is higher than that of the resin base material, and the noctilucent powder is higher than that of the resin base material. After the resin-based fluorescent fiber dots composed of the specific raw materials are added into a resin base material to prepare a fluorescent plastic part, the resin base material cannot be blackened, so that the fluorescent plastic part has the color of the resin base material under sunlight, meanwhile, the surface of the fluorescent plastic part has no fiber dot trace, and after sunlight irradiation, the fluorescent plastic part has good color fastness. The fluorescent powder can present a night sky fiber point fluorescent effect in a dark environment, does not need a power supply and a complex light path design, and is more suitable for being applied to automobile interior and exterior decorations, consumer electronic appearance parts and household appliance appearance parts.

Description

Technical Field

[0001] The present invention belongs to the technical field of plastic parts, and in particular relates to a fluorescent plastic part and a preparation method and application thereof. Background Art

[0002] The nighttime star-speckled effect is very popular in automotive interiors, lampshades, and interior decorations. However, current designs typically utilize numerous LED lights, which not only require a power source but also involve complex manufacturing processes. The lighting effect and styling often require the addition of new optical systems (such as light guides and thick walls), resulting in high costs, long development cycles, and numerous uncontrollable risks.

[0003] For example, CN218845897U provides a method for achieving a starry sky lighting effect by using the outgoing light from the upper side of the thick wall to pass through the light-transmitting patterned surface on the laser-carved decorative ring without adding a new optical system. However, this solution still requires LED lamps. For another example, CN112859330A provides a design method for a diffractive optical element that projects a starry sky effect, but this solution requires complex optical design and power supply equipment. For another example, CN215322250U provides a starry sky lamp frame structure for the middle roof of a bus, but this solution still requires the assembly of a starry sky lamp frame assembly, a variable light LED circuit board, etc. to achieve the starry sky dot effect.

[0004] Normally, when luminous powder is directly added to the resin to create a starry sky effect, the starry sky effect can also be observed at night. However, under normal daylight, the luminous spots will also appear in the shape of fiber spots. Compared with the starry sky effect created by LED lights, the fiber spots cannot be well hidden during the day. The fiber spots emerging in the plastic parts will be directly visible to the naked eye, which leads to a lack of aesthetics. Directly adding luminous powder will also darken the color of the plastic parts.

[0005] Therefore, it is of great significance to develop a fluorescent plastic part that has a high fiber point hiding rate under daylight and can present a starry sky spot effect at night. Summary of the Invention

[0006] In response to the shortcomings of the existing technology, the purpose of the present invention is to provide a fluorescent plastic part and its preparation method and application. The fluorescent plastic part is the color of the resin substrate itself under sunlight, has no traces of fiber dots on the surface, has a high fiber dot hiding rate, and after being exposed to sunlight, can present a night sky fiber dot fluorescent effect in a dark environment.

[0007] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a fluorescent plastic part, comprising the following components in parts by weight:

[0009] 70-85 parts by weight of resin base material;

[0010] 0-25 parts by weight of filler;

[0011] 0.01 to 0.08 parts by weight of resin-based fluorescent fiber dots;

[0012] Based on the total weight being 100%, the amounts of the components in the raw materials of the resin-based fluorescent fiber dots are as follows:

[0013] Transparent resin 94~99.99%;

[0014] Luminous powder 0.01~6%;

[0015] The lowest processing temperature of the transparent resin is greater than the lowest processing temperature of the resin substrate.

[0016] The fluorescent plastic part provided by the present invention includes a resin substrate, a filler and a resin-based fluorescent fiber dot. By limiting the raw materials of the resin-based fluorescent fiber dot to include a transparent resin and a luminous powder, and limiting the minimum processing temperature of the transparent resin to be greater than the minimum processing temperature of the resin substrate, on the one hand, because the transparent resin is used to coat the luminous powder, the luminous effect of the luminous powder itself will not be affected; on the other hand, limiting the minimum processing temperature of the transparent resin to be greater than the minimum processing temperature of the resin substrate can ensure that when the obtained resin-based fluorescent fiber dot is added to the resin substrate to make the fluorescent plastic part, the transparent resin and the luminous powder are in a state of being ... The resin substrates will not fuse with each other, and the transparent resin can still be coated on the surface of the luminous powder, thereby effectively avoiding direct and large-scale contact between the resin substrate and the luminous powder, thereby avoiding the problem that directly adding luminous powder will cause the resin substrate to turn black. It can ensure that the resulting fluorescent plastic parts have no defects on the surface under sunlight, no fiber point traces on the surface, and can show the color of the resin substrate itself. At the same time, it can be charged by sunlight. After being exposed to sunlight, it has a fluorescent effect in a dark environment without the need for a power supply and a complex optical path design. It is more suitable for application in automotive interior and exterior decoration, consumer electronic appearance parts and household appliance appearance parts, especially suitable for automotive interior parts.

[0017] Among them, the amount of the resin substrate can be 70 parts by weight, 71 parts by weight, 72 parts by weight, 74 parts by weight, 76 parts by weight, 78 parts by weight, 80 parts by weight, 82 parts by weight, 84 parts by weight or 85 parts by weight, and the mass percentage of the substrate in the fluorescent plastic part is not less than 70%.

[0018] The amount of the filler can be 5 parts by weight, 10 parts by weight, 15 parts by weight, 17 parts by weight, 19 parts by weight, 21 parts by weight, 23 parts by weight or 25 parts by weight.

[0019] The amount of the resin-based fluorescent fiber dots can be 0.01 parts by weight, 0.015 parts by weight, 0.02 parts by weight, 0.025 parts by weight, 0.03 parts by weight, 0.035 parts by weight, 0.04 parts by weight, 0.045 parts by weight, 0.05 parts by weight, 0.06 parts by weight, 0.07 parts by weight or 0.08 parts by weight, etc.

[0020] The amount of the transparent resin can be 94%, 94.5%, 95%, 95.5%, 96%, 96.5%, 97%, 97.5%, 98%, 98.5%, 99%, 99.5%, 99.6%, 99.7%, 99.8%, 99.9%, 99.92%, 99.94%, 99.96% or 99.99%, etc.

[0021] The amount of the luminous powder can be 0.01%, 0.05%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5% or 6%, etc.

[0022] In the present invention, the minimum processing temperature of the transparent resin refers to the lowest temperature at which the transparent resin can be melted. Similarly, the minimum processing temperature of the resin substrate refers to the lowest temperature at which the resin substrate can be melted. Both can be obtained by testing according to GB / T19466.1-2004 standard.

[0023] Preferably, at least a portion of the transparent resin is coated on the surface of the luminous powder.

[0024] Preferably, the mass percentage of the transparent resin in the raw materials of the resin-based fluorescent fiber dots is 99-99.9%.

[0025] Preferably, the minimum processing temperature of the transparent resin is ≥240°C, such as 240°C, 245°C, 250°C, 260°C, 270°C, 280°C or 290°C.

[0026] Preferably, the transparent resin includes PC resin and / or PMMA resin.

[0027] Preferably, the PC resin has a melt index of 3 to 100 g / 10 min at 300° C. and 1.2 kg, for example, 3 g / 10 min, 5 g / 10 min, 10 g / 10 min, 20 g / 10 min, 30 g / 10 min, 40 g / 10 min, 50 g / 10 min, 60 g / 10 min, 70 g / 10 min, 80 g / 10 min, 90 g / 10 min or 100 g / 10 min, more preferably 6 to 30 g / 10 min.

[0028] Preferably, the melt index of the PMMA resin at 230° C. and 3.8 kg is 1 to 50 g / 10 min, for example, 1 g / 10 min, 5 g / 10 min, 10 g / 10 min, 15 g / 10 min, 20 g / 10 min, 25 g / 10 min, 30 g / 10 min, 35 g / 10 min, 40 g / 10 min, 45 g / 10 min or 50 g / 10 min.

[0029] In the present invention, the melt index test method of the PMMA resin and PC resin can be tested with reference to ISO 1133-1:2022 standard.

[0030] Preferably, the mass percentage of the luminous powder in the raw materials of the resin-based fluorescent fiber dots is 0.1-1%.

[0031] Preferably, the luminous powder includes any one or a combination of at least two of rare earth doped strontium aluminate long afterglow luminescent powder, antimony and manganese co-activated calcium halophosphate luminescent powder, europium activated yttrium oxide luminescent powder or cerium and terbium co-activated aluminate luminescent powder.

[0032] Preferably, the resin substrate includes any one of PP resin, ABS resin or HIPS resin, or a combination of at least two of them.

[0033] Preferably, the melt index of the PP resin at 230° C. and 2.16 kg is 10 to 50 g / 10 min, for example, 10 g / 10 min, 15 g / 10 min, 20 g / 10 min, 25 g / 10 min, 30 g / 10 min, 35 g / 10 min, 40 g / 10 min, 45 g / 10 min or 50 g / 10 min.

[0034] In the present invention, the test method for the melt index of the PP resin can be tested with reference to ISO 1133-1:2022 standard.

[0035] Preferably, the melt index of the ABS resin at 220° C. and 10 kg is 5 to 40 g / 10 min, for example, 5 g / 10 min, 10 g / 10 min, 15 g / 10 min, 20 g / 10 min, 25 g / 10 min, 30 g / 10 min, 35 g / 10 min or 40 g / 10 min.

[0036] In the present invention, the test method for the melt index of the ABS resin can be tested with reference to ISO 1133-1:2022 standard.

[0037] Preferably, the HIPS resin has a melt index of 3 to 15 g / 10 min at 200° C. and 5 kg, for example, 3 g / 10 min, 4 g / 10 min, 5 g / 10 min, 6 g / 10 min, 7 g / 10 min, 8 g / 10 min, 9 g / 10 min, 10 g / 10 min, 12 g / 10 min, 14 g / 10 min or 15 g / 10 min.

[0038] In the present invention, the test method for the melt index of the HIPS resin can be tested with reference to ISO1133-1:2022 standard.

[0039] In the present invention, there is no particular limitation on the type of the filler, and fillers commonly used in the art may be selected. For example, the filler includes talc, glass fiber, calcium carbonate, and the like.

[0040] Preferably, the fluorescent plastic part further includes an antioxidant.

[0041] Preferably, the content of the antioxidant in the fluorescent plastic part is 0.005 to 0.01 parts by weight, for example, 0.005 parts by weight, 0.006 parts by weight, 0.007 parts by weight, 0.008 parts by weight, 0.009 parts by weight or 0.01 parts by weight.

[0042] Preferably, the antioxidant comprises a hindered phenol antioxidant, including but not limited to antioxidant 1098.

[0043] In a second aspect, the present invention provides a method for preparing the fluorescent plastic part according to the first aspect, the method comprising the following steps:

[0044] (1) Mix the transparent resin and the luminous powder, add them into the extruder for extrusion and granulation to obtain the resin-based fluorescent fiber dots.

[0045] (2) mixing a portion of the resin base material, the filler, and optionally an antioxidant to obtain a mixed material A;

[0046] Mixing the remaining portion of the resin substrate with the resin-based fluorescent fiber dots obtained in step (1) to obtain a mixture B;

[0047] (3) The mixed material A obtained in step (2) is fed as the main feed, and the mixed material B obtained is fed as the side feed, and the mixed material A is extruded to obtain the fluorescent plastic part.

[0048] Preferably, the portion of the resin substrate in step (2) accounts for 80-90% of the total mass of the resin substrate, such as 80%, 82%, 84%, 86%, 88% or 90%.

[0049] Preferably, the mixing time in step (1) is 20 to 40 min, for example, 20 min, 22 min, 24 min, 26 min, 28 min, 30 min, 32 min, 34 min, 36 min, 38 min or 40 min.

[0050] Preferably, the temperature of the extrusion granulation in step (1) is 240-270°C, for example, 240°C, 245°C, 250°C, 255°C, 260°C, 265°C or 270°C.

[0051] Preferably, the mixing time of mixing part of the resin substrate, filler and optional antioxidant in step (2) is 3 to 5 minutes, for example, 3 minutes, 3.2 minutes, 3.4 minutes, 3.6 minutes, 3.8 minutes, 4 minutes, 4.2 minutes, 4.4 minutes, 4.6 minutes, 4.8 minutes or 5 minutes.

[0052] Preferably, the mixing time of the remaining part of the resin substrate and the resin-based fluorescent fiber dots obtained in step (1) in step (2) is 3 to 5 minutes, for example, 3 minutes, 3.2 minutes, 3.4 minutes, 3.6 minutes, 3.8 minutes, 4 minutes, 4.2 minutes, 4.4 minutes, 4.6 minutes, 4.8 minutes or 5 minutes, etc.

[0053] Preferably, the extrusion molding temperature in step (3) is 200-230°C, for example, 200°C, 205°C, 210°C, 215°C, 220°C, 225°C or 230°C.

[0054] In a third aspect, the present invention provides a use of the fluorescent plastic part as described in the first aspect in automobile interior and exterior decoration, consumer electronic appearance parts, or household appliance appearance parts.

[0055] The numerical range described in the present invention includes not only the point values ​​listed above, but also any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0056] Compared with the prior art, the present invention has the following beneficial effects:

[0057] The fluorescent plastic part provided by the present invention includes a resin substrate, a filler and resin-based fluorescent fiber dots. The raw materials of the resin-based fluorescent fiber dots include a transparent resin and a luminous powder. The minimum processing temperature of the transparent resin is greater than the minimum processing temperature of the resin substrate. By selecting the transparent resin and the luminous powder with the above-mentioned specific processing temperature, the obtained resin-based fluorescent fiber dots will not cause the resin substrate to turn black after being added to the resin substrate to make a fluorescent plastic part. The obtained fluorescent plastic part is the color of the resin itself under sunlight, and there are no traces of fiber dots on the surface. After being exposed to sunlight, it can present a night sky fiber dot fluorescent effect in a dark environment. It does not require a power supply and a complex optical path design, and is more suitable for application in automotive interior and exterior decoration, consumer electronic appearance parts and household appliance appearance parts, especially suitable for automotive interior parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 This is a real picture of the fluorescent plastic part provided in Example 1 under sunlight;

[0059] Figure 2 This is a physical picture of the fluorescent plastic part provided in Comparative Example 1 under sunlight;

[0060] Figure 3 This is a real picture of the fluorescent plastic part provided in Example 1 in a dark environment;

[0061] Figure 4 This is a real picture of the fluorescent plastic part provided in comparative example 1 in a dark environment. DETAILED DESCRIPTION

[0062] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0063] The detailed information of some raw materials involved in the following specific embodiments is as follows:

[0064] (1A) PC resin

[0065] PC resin A: minimum processing temperature is 260℃, melt index is 10g / 10min (300℃ / 1.2kg), purchased from Luxi Chemical, brand TY1609T-11;

[0066] PC resin B: minimum processing temperature of 260°C, melt index of 20g / 10min (300°C / 1.2kg), purchased from Liaocheng Luxi Polycarbonate Co., Ltd., brand LXTY1920T-11;

[0067] PC resin C: minimum processing temperature is 260 ° C, melt index is 24g / 10min (300 ° C / 1.2kg), purchased from Cangzhou Dahua Co., Ltd., brand name CH8225;

[0068] PC resin D: minimum processing temperature is 260℃, melt index is 5g / 10min (300℃ / 1.2kg), purchased from SABIC, brand is LEXAN TM PC0700;

[0069] PC resin E: the minimum processing temperature is 260°C, the melt index is 65g / 10min (300°C / 1.2kg), purchased from Idemitsu, Japan, with the brand name LC1500.

[0070] (1B) PMMA resin: minimum processing temperature is 260℃, melt index is 16g / 10min (230℃ / 3.8kg), purchased from Chimei, Taiwan, China, brand CM-211.

[0071] (1C) PBT resin: minimum processing temperature is 250°C, purchased from Sinopec Yizheng Chemical Fiber Co., Ltd., brand LRPBT GX111;

[0072] (1D) PP resin: the minimum processing temperature is 200 °C, purchased from Hunan Xinjiyuan New Material Technology Co., Ltd., brand RPP DCM-1114.

[0073] (2) Luminous powder

[0074] Rare earth doped strontium aluminate long afterglow luminescent powder: specifically SrAlO:Eu,Dy, purchased from Zhejiang Minghui, brand MHG-4A;

[0075] Calcium halophosphate luminescent powder activated by antimony and manganese: specifically Ca5(F,Cl)(PO4)3:Sb, Mn, commonly available on the market.

[0076] (3) Resin substrate

[0077] PP resin: melt index is 30 g / 10 min (230 ° C / 2.16 kg), purchased from Borealis LyondellBasell Petrochemical Co., Ltd., brand PP EP548R;

[0078] ABS resin: melt index 21 g / 10 min (220 ° C / 10 kg), purchased from Liaoning Jinfa Technology Co., Ltd., brand ABS KF-730;

[0079] HIPS resin: melt index is 7.5g / 10min (200℃ / 5kg), purchased from Guangzhou North Chemical Co., Ltd., brand HIPS 825 Panjin

[0080] (4) Filler

[0081] Talc: purchased from Haicheng Tianyuan Chemical Co., Ltd., brand TYT-777A.

[0082] (5) Antioxidants

[0083] Antioxidant 1098: purchased from Jinli Anlong New Materials Co., Ltd., hindered phenol antioxidant, brand RIANOX 1098.

[0084] Synthesis Examples 1 to 10

[0085] Synthesis Examples 1 to 10 respectively provide a resin-based fluorescent fiber dot, wherein the raw materials include a transparent resin and a luminous powder, and at least a portion of the transparent resin is coated on the surface of the luminous powder;

[0086] The amounts of the transparent resin and the luminous powder are shown in Table 1. In Table 1, the units of the amounts of each component are "%".

[0087] Table 1

[0088]

[0089] The preparation method of the resin-based fluorescent fiber dots provided in Synthesis Examples 1 to 10 includes: mixing transparent resin and luminous powder for 30 minutes, adding the mixture into an extruder, and extruding and granulating at 250° C. to obtain the resin-based fluorescent fiber dots.

[0090] Comparative Synthesis Example 1

[0091] A fluorescent fiber dot, specifically a rare earth doped strontium aluminate long afterglow luminescent powder.

[0092] Comparative Synthesis Example 2

[0093] A fluorescent fiber dot, which differs from Synthesis Example 1 only in that PBT resin is used instead of PC resin A, and other structures, materials, amounts and preparation methods are the same as those in Synthesis Example 1.

[0094] Comparative Synthesis Example 3

[0095] A fluorescent fiber dot, which differs from Example 1 only in that PP resin is used instead of PC resin A, and other structures, materials, amounts and preparation methods are the same as those in Synthesis Example 1.

[0096] Examples 1 to 16

[0097] Examples 1 to 16 respectively provide a fluorescent plastic part, and the components contained therein are shown in Table 2. In Table 2, the unit of amount of each component is "parts by weight";

[0098] Table 2

[0099]

[0100]

[0101] The preparation method of the fluorescent plastic parts provided in Examples 1 to 16 includes the following steps:

[0102] (1) Mixing 85% by weight of a resin matrix, a filler, and an antioxidant for 4 minutes to obtain a mixture A;

[0103] The resin matrix (15% by weight) and the fluorescent fiber were mixed for 30 minutes to obtain a mixture B;

[0104] (2) The mixed material A obtained in step (1) is fed as the main feed and the mixed material B is fed as the side feed, and extrusion molding is performed at 220° C. using a twin-screw extruder to obtain the fluorescent plastic part.

[0105] Comparative Example 1

[0106] A fluorescent plastic part differs from Example 1 only in that the fluorescent fiber dots provided in Comparative Synthesis Example 1 are used to replace the fluorescent fiber dots provided in Synthesis Example 1, and other components, amounts and preparation methods are the same as those in Example 1.

[0107] Comparative Example 2

[0108] A fluorescent plastic part differs from Example 1 only in that the fluorescent fiber dots provided in Comparative Synthesis Example 2 are used to replace the fluorescent fiber dots provided in Synthesis Example 1, and other components, amounts and preparation methods are the same as those in Example 1.

[0109] Comparative Example 3

[0110] A fluorescent plastic part differs from Example 1 only in that the fluorescent fiber dots provided in Comparative Synthesis Example 3 are used to replace the fluorescent fiber dots provided in Synthesis Example 1, and other components, amounts and preparation methods are the same as those in Example 1.

[0111] Appearance

[0112] Visually observe the appearance of the fluorescent plastic part obtained in Example 1 and the fluorescent plastic part obtained in Comparative Example 1 under daylight and under night light, and obtain the actual picture of the fluorescent plastic part obtained in Example 1 under daylight as shown below: Figure 1 As shown, the actual picture of the fluorescent plastic part obtained in comparative example 1 under sunlight is as follows Figure 2 As shown, the actual picture of the fluorescent plastic part obtained in Example 1 under night light is as follows Figure 3 As shown, the actual picture of the fluorescent plastic part obtained in comparative example 1 under night light is as follows Figure 4 As shown;

[0113] from Figure 1 and Figure 2 From the comparison, it can be seen that: on the one hand, the fluorescent fiber dots of the fluorescent plastic part provided in Example 1 cannot be seen visually under daylight, that is, the hiding effect of the fluorescent fiber dots is good, while the fluorescent fiber dots of the fluorescent plastic part provided in Comparative Example 1 are obvious under daylight, and the fluorescent fiber dots do not have a good hiding effect; on the other hand, in terms of color, the color depth of the fluorescent plastic part provided in Example 1 is lighter than that of the fluorescent plastic part provided in Comparative Example 1. This is because directly adding fiber dots will cause the resin to turn black, while when transparent resin and luminous powder are combined to make resin-based fluorescent fiber dots and then added to the resin base material, the luminous powder will not affect the color of the resin.

[0114] from Figure 3 and Figure 4 From the comparison, it can be seen that the fluorescent plastic parts provided in Example 1 and the fluorescent plastic parts provided in Comparative Example 1 both have good fluorescent effects in a dark environment. However, compared with the fluorescent plastic parts provided in Comparative Example 1, the fluorescent effect of the fluorescent fiber points of the fluorescent plastic parts provided in Example 1 has a more obvious contrast with the background color of the plastic resin, and the fluorescent fiber points are larger and more dispersed, which can better simulate the effect of a night light.

[0115] Performance testing:

[0116] (1) Fluorescent fiber dot hiding rate: Analyzed and tested using a Leica V2rayN microscope under daylight;

[0117] Specific test method: Place the fiber spot under a microscope, take a picture with 6 times magnification, open the picture with IamgeJ software, and calculate the area S of a single fiber spot. 单个 Place the fluorescent plastic color plate to be tested under a microscope, adjust the magnification to 6 times, take a picture of the fluorescent plastic color plate to be tested, open the picture with ImageJ software, and use the software to calculate the number n of fiber points contained in the fluorescent plastic color plate to be tested and the total area S of the fiber points 总 ; The average area S of a single fiber point on the fluorescent plastic color plate to be tested 浮现平均 =S 总 / n;

[0118] The calculated fiber point hiding rate = 1-1 / n×SQRT[(S 浮现平均 -S 单个 ) 2 ].

[0119] (2) L value: The test was conducted using a Spectro 1050 desktop spectrophotometer in the reflectance mode in accordance with the test standard GB / T3979-2008, which states the method for measuring object color.

[0120] (3) Fluorescence effect: In a dark environment, visually inspect whether the fluorescent fiber points in the fluorescent plastic are evenly dispersed and whether the fluorescent effect is obvious.

[0121] The fluorescent plastic parts provided in Examples 1 to 16 and Comparative Examples 1 to 3 were tested according to the above test method. The test results are shown in Table 3:

[0122] Table 3

[0123]

[0124]

[0125] According to the data in Table 3, we can see that:

[0126] (1) The fluorescent plastic parts provided in Examples 1 to 16 have a fluorescent fiber dot hiding rate of 50% to 100% under sunlight, and an L value of the fluorescent plastic parts is 60.9 to 75.52. At the same time, the fluorescent plastic parts all have a fluorescent effect in a dark environment; in particular, the fluorescent plastic parts provided in Examples 1 to 7, Example 10, and Examples 15 to 16 have a fluorescent fiber dot hiding rate of up to 100% under sunlight, and an L value of 75.2 to 75.52. At the same time, the fluorescent plastic parts all have a fluorescent effect in a dark environment;

[0127] The fluorescent plastic part provided in Comparative Example 1 has a fluorescent fiber dot hiding rate of only 10% under sunlight, and the hiding effect is poor. At the same time, the L value of the obtained fluorescent plastic part is only 60.1, and the color is dark, indicating that the direct addition of fluorescent fiber dots affects the color of the resin itself; the fluorescent plastic part provided in Comparative Example 2 completely hides the fluorescent fiber dots under sunlight, and the L value of the obtained fluorescent plastic part is as high as 75.1. However, since PBT is a milky white translucent resin and has a covering power for luminous powder, the fluorescent effect of the prepared fluorescent plastic part is very poor; and the fluorescent plastic part provided in Comparative Example 3 uses PP resin as the transparent resin, and the processing temperature of PP resin is low, which will cause the resin-based fluorescent fiber dots and the resin base material to separate from the PP resin during processing, and the luminous powder will emerge on the surface of the plastic part, that is, the fiber dot hiding rate is only 10%, and the L value is only 59.8, and the color is dark.

[0128] (2) According to the data of Example 1 and Examples 4 to 9, it can be seen that by further optimizing the melt index of the PC resin, the fiber points can be 100% hidden in sunlight, and the color of the resin substrate itself will not be affected at all, and a fluorescent plastic part with obvious fluorescent effect in a dark environment can be obtained; if the melt index of the PC resin is too low (Example 8) or too high (Example 9), the hiding effect of the obtained fluorescent fiber points in the resin substrate will be slightly poor. This shows that the PC resin with too low and too high melt index has a slightly poor coating effect on the luminous powder particles during the machine process, resulting in too many luminous powder particles still in a naked state, and then they can still be seen in sunlight after injection molding.

[0129] (3) By comparing Example 1 with Examples 11 to 12, it can be found that when the proportion of PC resin in the fluorescent fiber dots is too high (Example 11), the PC resin shell layer will be over-coated, which will make the appearance of the fluorescent fiber dots in the fluorescent plastic parts slightly worse, resulting in slightly worse fluorescence effect of the fluorescent plastic parts in a dark environment; and when the proportion of PC resin in the fluorescent fiber dots is too low (Example 12), it will make it difficult for the PC resin to coat the luminous powder particles during the machine process, resulting in too many luminous powder particles still in a naked state, so they can still be seen in daylight after injection molding, and the hiding rate of the fluorescent fiber dots is reduced.

[0130] (4) Comparing the data of Example 1 with Examples 13-14, it can be seen that when the amount of fluorescent fiber dots added to the fluorescent plastic part is too low (Example 13), the fluorescent effect of the fluorescent plastic part in a dark environment will be slightly poor; and when the amount of fluorescent fiber dots added to the fluorescent plastic part is too high (Example 14), although the hiding rate of the fluorescent fiber dots in the fluorescent plastic part can be guaranteed to be high, the fluorescent fiber dots will be aggregated in the plastic part, and the starry sky spot effect will be poor.

[0131] The applicant declares that the above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention fall within the scope of protection and disclosure of the present invention.

Claims

1. A fluorescent plastic part, characterized in that: The fluorescent plastic part comprises the following components in parts by weight: 70 to 85 parts by weight of resin base material; Filler 0-25 parts by weight; 0.01 to 0.08 parts by weight of resin-based fluorescent fiber dots; Based on the total weight of 100%, the amount of each component in the raw material of the resin-based fluorescent fiber dots is as follows: Transparent resin 94~99.99%; Luminous powder 0.01~6%; The lowest processing temperature of the transparent resin is greater than the lowest processing temperature of the resin substrate.

2. The fluorescent plastic part according to claim 1, characterized in that: At least a portion of the transparent resin is coated on the surface of the luminous powder; Preferably, the mass percentage of the transparent resin in the raw material of the resin-based fluorescent fiber dots is 99-99.9%; Preferably, the minimum processing temperature of the transparent resin is ≥240°C; Preferably, the transparent resin includes PC resin and / or PMMA resin; Preferably, the PC resin has a melt index of 3 to 100 g / 10 min at 300° C. and 1.2 kg, more preferably 6 to 30 g / 10 min; Preferably, the PMMA resin has a melt index of 1 to 50 g / 10 min at 230° C. and 3.8 kg.

3. The fluorescent plastic part according to claim 1 or 2, characterized in that: The mass percentage of the luminous powder in the raw materials of the resin-based fluorescent fiber dots is 0.1-1%; Preferably, the luminous powder includes any one or a combination of at least two of rare earth doped strontium aluminate long afterglow luminescent powder, antimony and manganese co-activated calcium halophosphate luminescent powder, europium activated yttrium oxide luminescent powder or cerium and terbium co-activated aluminate luminescent powder.

4. The fluorescent plastic part according to any one of claims 1 to 3, characterized in that: The resin substrate includes any one of PP resin, ABS resin or HIPS resin or a combination of at least two thereof; Preferably, the melt index of the PP resin at 230° C. and 2.16 kg is 10 to 50 g / 10 min; Preferably, the melt index of the ABS resin at 220° C. and 10 kg is 5 to 40 g / 10 min; Preferably, the HIPS resin has a melt index of 3 to 15 g / 10 min at 200° C. and 5 kg.

5. The fluorescent plastic part according to any one of claims 1 to 4, characterized in that: The fluorescent plastic part also includes an antioxidant; Preferably, the content of the antioxidant in the fluorescent plastic part is 0.005 to 0.01 parts by weight; Preferably, the antioxidant comprises a hindered phenol antioxidant.

6. A method for preparing a fluorescent plastic part according to any one of claims 1 to 5, characterized in that: The preparation method comprises the following steps: (1) Mixing transparent resin and luminous powder, adding them into an extruder for extrusion granulation, and obtaining resin-based fluorescent fiber dots; (2) mixing a portion of the resin substrate, the filler and optionally an antioxidant to obtain a mixed material A; Mixing the remaining resin substrate with the resin-based fluorescent fiber dots obtained in step (1) to obtain a mixed material B; (3) The mixed material A obtained in step (2) is mainly fed, and the mixed material B obtained is side fed, and extrusion molding is performed to obtain the fluorescent plastic part.

7. The preparation method according to claim 6, characterized in that: The mixing time in step (1) is 20 to 40 minutes; Preferably, the temperature of the extrusion granulation in step (1) is 240-270°C.

8. The preparation method according to claim 6 or 7, characterized in that: The part of the resin substrate in step (2) accounts for 80-90% of the total mass of the resin substrate; Preferably, the mixing time of the part of the resin substrate, the filler and the optional antioxidant in step (2) is 3 to 5 minutes; Preferably, the mixing time of the remaining part of the resin substrate and the resin-based fluorescent fiber dots obtained in step (1) in step (2) is 3 to 5 minutes.

9. The preparation method according to any one of claims 6 to 8, characterized in that: The extrusion molding temperature in step (3) is 200-230°C.

10. Use of the fluorescent plastic part according to any one of claims 1 to 5 in automobile interior and exterior decoration, consumer electronic appearance parts or household appliance appearance parts.

Images