Luminescent material for slippers and preparation method thereof

Abstract

The invention relates to the field of luminescent materials, in particular to a luminescent material for slippers and a preparation method of the luminescent material. The luminescent material is prepared from the following components in parts by weight: 70 to 80 parts of ethylene-vinyl acetate copolymer, 15 to 25 parts of thermoplastic polyester elastomer, 10 to 20 parts of modified noctilucent powder, 8 to 16 parts of filler, 3.5 to 5.5 parts of foaming agent, 0.2 to 0.5 part of cross-linking agent, 0.5 to 1 part of lubricant, 0.3 to 0.5 part of ultraviolet light absorber and 1 to 2 parts of anti-aging agent. According to the luminescent material, the ethylene-vinyl acetate copolymer (EVA) and the thermoplastic polyester elastomer (TPEE) serve as main raw materials, EVA can provide high flexibility and shock absorption capacity, and TPEE can improve the strength, toughness, wear resistance and aging resistance of the material, so that the use effect of an insole is enhanced.

Description

Technical Field

[0001] This invention relates to the field of luminescent materials, and more specifically to a luminescent material for slippers and its preparation method. Background Technology

[0002] To ensure the safety of pedestrians, especially the elderly and children, walking at night, it is essential to add illuminated warning signs to their shoes or clothing so that vehicles can spot them promptly. Current technology for adding these warning signs to shoes primarily involves installing LEDs or filling the soles with different colored fluorescent powders to achieve a luminous effect. Fluorescent powder is made from special materials and operates on the principle of fluorescence, the phenomenon where a substance emits light when excited, providing visibility and increasing safety for the wearer. Fluorescent powder is used in the manufacture of shoe sole materials to achieve this luminous effect. When light shines on the fluorescent powder, it absorbs the light energy and emits fluorescence, typically in bright colors such as green, yellow, or orange.

[0003] The manufacturing process of fluorescent soles is relatively complex, requiring specialized techniques and materials, with rubber being the most commonly used. Rubber soles are made from rubber materials, which can be natural or synthetic. Rubber offers excellent wear resistance and slip resistance, providing stable grip, especially on wet surfaces, reducing the risk of slipping. However, rubber is relatively heavy, potentially affecting flexibility and lightness. EVA material offers excellent lightness and cushioning, weighing only about one-third of rubber, and possesses excellent energy rebound properties, absorbing over 90% of impact. However, EVA materials generally suffer from poor wear resistance and weak slip resistance. Furthermore, when used as a luminescent material with added fluorescent powder, it suffers from insufficient luminescence and short luminescence time, making it difficult to meet the actual needs of nighttime walkers. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of this invention is to provide a luminescent material for slippers and a method for preparing the same.

[0005] The objective of this invention is achieved through the following technical solution: In a first aspect, the present invention provides a luminescent material for slippers, comprising, by weight parts: 70-80 parts ethylene-vinyl acetate copolymer (EVA), 15-25 parts thermoplastic polyester elastomer (TPEE), 10-20 parts modified luminescent powder, 8-16 parts filler, 3.5-5.5 parts foaming agent, 0.2-0.5 parts crosslinking agent, 0.5-1 part lubricant, 0.3-0.5 parts ultraviolet absorber, and 1-2 parts antioxidant.

[0006] Preferably, the ethylene-vinyl acetate copolymer (EVA) has a VA content of 18-28% and a density of 0.91-0.93 g / cm³. 3 The melt flow index is 14-26 g / 10 min (190℃ / 2.16 kg).

[0007] Preferably, the density of the thermoplastic polyester elastomer (TPEE) is 1.1-1.3 g / cm³. 3 The melt flow index is 10-18 g / 10 min (220℃ / 2.16 kg).

[0008] Preferably, the filler is a mixture of nano-calcium carbonate and talc, with a mass ratio of nano-calcium carbonate to talc of 1-2:1.

[0009] Preferably, the foaming agent is a mixture of 4,4'-oxobisbenzenesulfonyl hydrazine (OBSH) and azodicarbonamide (AC), wherein the mass ratio of 4,4'-oxobisbenzenesulfonyl hydrazine to azodicarbonamide is 3-5:0.5-1.

[0010] Preferably, the crosslinking agent is dicumyl peroxide (DCP) or bis-tert-butylperoxide (BIPB).

[0011] Preferably, the lubricant is one of stearic acid, zinc stearate, and magnesium stearate.

[0012] Preferably, the ultraviolet absorber is at least one of UV-531, UV-284, UV-326, and UV-944.

[0013] Preferably, the antioxidant is at least one of antioxidant RD, antioxidant TNP, and antioxidant MB.

[0014] Preferably, the method for preparing the modified phosphorescent powder includes: S1. Surface activation treatment: Weigh out the aminosilane coupling agent and add it to the mixture of ethanol and deionized water. After stirring thoroughly, add the phosphorescent powder and stir at 40-60℃ for 10-20 hours. Then filter, wash and dry to obtain activated phosphorescent powder. S2, Surface modification treatment: Weigh out the activated phosphorescent powder and add it to anhydrous toluene. Disperse it evenly in an ice-water bath. Under nitrogen protection, gradually add pyridine-3-sulfonyl chloride while continuously stirring. After all the powder has been added, heat it to 5-10℃, add a small amount of acid-binding agent, and keep it warm and stirred for 2-3 hours. After the reaction is complete, filter the reaction solution through a filter membrane, wash it with toluene and methanol in sequence, and dry it under vacuum at 50℃ for 4 hours to obtain the modified phosphorescent powder.

[0015] Preferably, in S1, the aminosilane coupling agent is at least one of KH550 (γ-aminopropyltriethoxysilane), KH602 (N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane), and KH792 (N-β-aminoethyl-γ-aminopropyltrimethoxysilane).

[0016] Preferably, in S1, the phosphorescent powder is a long-afterglow luminescent material, specifically CaAl. 12 O 19 :Mn 4+ Zn3Ga2GeO8:Cr 3+ Mg3Ga2GeO8:Cr 3+ La2MgZrO6:Cr 3+ One or more of them.

[0017] Preferably, in step S1, the mass-to-volume ratio of the luminescent powder, aminosilane coupling agent, ethanol, and deionized water is 1 g:(0.2-0.6) g:(10-20) mL:(5-10) mL. Preferably, in S2, the mass-to-volume ratio of activated phosphorescent powder, pyridine-3-sulfonyl chloride, and anhydrous toluene is 1 g:(0.36-0.72) g:(10-20) mL.

[0018] Preferably, in step S2, the acid-binding agent is triethylamine, and the amount added is 1%-5% of the mass of the activated phosphorescent powder.

[0019] Secondly, the present invention provides a method for preparing a luminescent material for slippers, comprising the following steps: Step 1: Dehydrate the ethylene-vinyl acetate copolymer (EVA) and thermoplastic polyester elastomer to a moisture content of ≤0.1%, add them to a mixer, heat to 120-130℃, and melt-mix until homogeneous; Step 2: Reduce the temperature inside the internal mixer to 110-120℃, then add the modified luminescent powder, filler, lubricant, ultraviolet absorber and antioxidant in sequence, and mix for 10-20 minutes. Step 3: Add foaming agent into the mixer and treat it at 100-110℃ and 30-50r / min for 5-10 minutes. Then, granulate it through twin-screw extrusion to obtain masterbatch material. Step 4: Place the masterbatch material in the open mill and pass it through 5 times at a roller temperature of 90-100℃ and a roller gap of 0.5mm. Then cut it into sheets with a thickness of 2mm. Step 5: Place the sheet in the foaming molding machine and perform a two-stage heating and molding foaming process: the first stage is processed at 120℃ and 15MPa for 5 minutes; the second stage is processed at 165℃ and 12MPa for 8 minutes, followed by cooling and demolding. Step 6: Place the foamed material in an 80℃ oven for 10-20 minutes to relieve stress and obtain the luminescent material for slippers.

[0020] The beneficial effects of this invention are as follows: 1. This invention prepares a luminescent material suitable for slippers. This luminescent material not only has excellent luminescent properties, but also excellent strength, toughness, wear resistance and aging resistance, taking into account both comfort and durability. It is particularly suitable for the manufacture of midsole materials for mid-to-high-end slippers.

[0021] 2. The luminescent material of the present invention uses ethylene-vinyl acetate copolymer (EVA) and thermoplastic polyester elastomer (TPEE) as the main raw materials. EVA can provide strong flexibility and shock absorption, while TPEE can improve the strength, toughness, abrasion resistance and aging resistance of the material, thereby enhancing the performance of the midsole.

[0022] 3. This invention selects a long-afterglow luminescent material as the phosphorescent powder. This material exhibits superior luminescence performance compared to traditional sulfides. The phosphorescent powder is modified through a combination of amino activation and sulfonyl chloride-amino condensation reactions, resulting in a surface coating of sulfonamide and pyridine groups. This not only significantly improves the dispersion of the phosphorescent powder in the matrix but also effectively protects it, enhancing the stability and uniformity of its luminescence.

[0023] 4. The modified luminescent powder prepared by this invention not only enhances the interfacial bonding force with the material, but also, as tested, has been found to enhance various properties of the material itself.

[0024] 5. This invention adds an additional filler, which is a compound of nano-calcium carbonate and talc. The calcium carbonate improves rigidity, and the talc layer structure can block oxygen penetration and delay aging to a certain extent. Attached Figure Description

[0025] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0026] Figure 1 This is a SEM image of the luminescent material prepared in Example 1 of the present invention. Detailed Implementation

[0027] The technical solution of the present invention is illustrated below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not preclude the existence of other method steps before or after the combined steps, or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless otherwise stated, the numbering of each method step is merely a convenient tool for identifying each method step, and not for limiting the order of the method steps or defining the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention.

[0028] To better understand the above technical solutions, exemplary embodiments of the present invention are described in more detail below. While exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the invention to those skilled in the art.

[0029] The present invention will be further described below with reference to the following embodiments.

[0030] Example 1 A luminescent material for slippers, comprising, by weight: 75 parts ethylene-vinyl acetate copolymer (EVA), 20 parts thermoplastic polyester elastomer (TPEE), 15 parts modified luminescent powder, 12 parts filler, 4.5 parts foaming agent, 0.4 parts crosslinking agent, 0.8 parts lubricant, 0.4 parts ultraviolet absorber and 1.5 parts antioxidant.

[0031] The ethylene-vinyl acetate copolymer (EVA) contains 22% VA and has a density of 0.92 g / cm³. 3 The melt flow index is 18 g / 10 min (190℃ / 2.16 kg); the density of the thermoplastic polyester elastomer (TPEE) is 1.2 g / cm³. 3 The melt flow index is 15 g / 10 min (220℃ / 2.16 kg); the filler is a mixture of nano-calcium carbonate and talc powder, with a mass ratio of nano-calcium carbonate to talc powder of 1.5:1; the foaming agent is a mixture of 4,4'-oxobisbenzenesulfonyl hydrazine (OBSH) and azodicarbonamide (AC), with a mass ratio of 4:0.6; the crosslinking agent is dicumyl peroxide (DCP); the lubricant is stearic acid; the ultraviolet absorber is UV-531; and the antioxidant is antioxidant RD.

[0032] The preparation method of the modified phosphorescent powder includes: S1. Surface activation treatment: Weigh 0.4g of aminosilane coupling agent KH550 and add it to a mixture of 15mL ethanol and 8mL deionized water. After stirring thoroughly, add 1g of phosphorescent powder CaAl with a particle size of 20-30μm. 12 O 19 :Mn 4+ The mixture was stirred at 50°C for 15 hours, then filtered, washed, and dried to obtain activated phosphorescent powder. S2, Surface modification treatment: 1 g of activated luminescent powder was weighed and added to 15 mL of anhydrous toluene. The mixture was dispersed evenly in an ice-water bath. Under nitrogen protection, 0.48 g of pyridine-3-sulfonyl chloride was gradually added with continuous stirring. After all the powder was added, the temperature was raised to 8 °C, and triethylamine was added dropwise at 3% of the mass of the activated luminescent powder. The mixture was kept at this temperature and stirred for 2 hours. After the reaction was complete, the reaction solution was filtered through a filter membrane, washed successively with toluene and methanol, and dried under vacuum at 50 °C for 4 hours to obtain the modified luminescent powder. The above-mentioned method for preparing the luminescent material for slippers includes the following steps: Step 1: Dehydrate the ethylene-vinyl acetate copolymer (EVA) and thermoplastic polyester elastomer to a moisture content of ≤0.1%, add them to a mixer, heat to 125°C, and melt-mix until homogeneous; Step 2: Reduce the temperature inside the internal mixer to 110°C, then add the modified luminescent powder, filler, lubricant, ultraviolet absorber and antioxidant in sequence, and mix for 15 minutes. Step 3: Add foaming agent into the mixer, treat for 7 minutes at 110℃ and 40r / min, and then granulate by twin-screw extrusion to obtain masterbatch material; Step 4: Place the masterbatch material in the open mill and pass it through 5 times at a roller temperature of 100℃ and a roller gap of 0.5mm. Then cut it into sheets with a thickness of 2mm. Step 5: Place the sheet in the foaming molding machine and perform a two-stage heating and molding foaming process: the first stage is processed at 120℃ and 15MPa for 5 minutes; the second stage is processed at 165℃ and 12MPa for 8 minutes, followed by cooling and demolding. Step 6: Place the foamed material in an 80℃ oven for 15 minutes to relieve stress and obtain the luminescent material for slippers.

[0033] Example 2 A luminescent material for slippers, comprising, by weight: 70 parts ethylene-vinyl acetate copolymer (EVA), 15 parts thermoplastic polyester elastomer (TPEE), 10 parts modified luminescent powder, 8 parts filler, 3.5 parts foaming agent, 0.2 parts crosslinking agent, 0.5 parts lubricant, 0.3 parts ultraviolet absorber and 1 part antioxidant.

[0034] The ethylene-vinyl acetate copolymer (EVA) contains 22% VA and has a density of 0.92 g / cm³. 3 The melt flow index is 18 g / 10 min (190℃ / 2.16 kg); the density of the thermoplastic polyester elastomer (TPEE) is 1.2 g / cm³. 3 The melt flow index is 15 g / 10 min (220℃ / 2.16 kg); the filler is a mixture of nano-calcium carbonate and talc powder, with a mass ratio of nano-calcium carbonate to talc powder of 1:1; the preparation method of the modified phosphorescent powder is the same as in Example 1; the foaming agent is a mixture of 4,4'-oxobisbenzenesulfonyl hydrazine (OBSH) and azodicarbonamide (AC), with a mass ratio of 4,4'-oxobisbenzenesulfonyl hydrazine to azodicarbonamide of 3:0.5; the crosslinking agent is dicumyl peroxide (DCP); the lubricant is zinc stearate; the ultraviolet absorber is UV-284; and the antioxidant is antioxidant TNP.

[0035] The above-mentioned method for preparing the luminescent material for slippers includes the following steps: Step 1: Dehydrate the ethylene-vinyl acetate copolymer (EVA) and thermoplastic polyester elastomer to a moisture content of ≤0.1%, add them to a mixer, heat to 120°C, and melt-mix until homogeneous; Step 2: Reduce the temperature inside the internal mixer to 110℃, then add the modified luminescent powder, filler, lubricant, ultraviolet absorber and antioxidant in sequence, and mix for 10 minutes. Step 3: Add foaming agent into the mixer, treat for 5 minutes at 100℃ and 30r / min, and then granulate by twin-screw extrusion to obtain masterbatch material; Step 4: Place the masterbatch material in the open mill and pass it through 5 times at a roller temperature of 90°C and a roller gap of 0.5mm. Then cut it into sheets with a thickness of 2mm. Step 5: Place the sheet in the foaming molding machine and perform a two-stage heating and molding foaming process: the first stage is processed at 120℃ and 15MPa for 5 minutes; the second stage is processed at 165℃ and 12MPa for 8 minutes, followed by cooling and demolding. Step 6: Place the foamed material in an 80℃ oven for 10 minutes to relieve stress and obtain the luminescent material for slippers.

[0036] Example 3 A luminescent material for slippers, comprising, by weight: 80 parts ethylene-vinyl acetate copolymer (EVA), 25 parts thermoplastic polyester elastomer (TPEE), 20 parts modified luminescent powder, 16 parts filler, 5.5 parts foaming agent, 0.5 parts crosslinking agent, 1 part lubricant, 0.5 parts ultraviolet absorber and 2 parts antioxidant.

[0037] The ethylene-vinyl acetate copolymer (EVA) contains 22% VA and has a density of 0.92 g / cm³. 3 The melt flow index is 18 g / 10 min (190℃ / 2.16 kg); the density of the thermoplastic polyester elastomer (TPEE) is 1.2 g / cm³. 3 The melt flow index is 15 g / 10 min (220℃ / 2.16 kg); the filler is a mixture of nano-calcium carbonate and talc powder, with a mass ratio of nano-calcium carbonate to talc powder of 2:1; the preparation method of the modified phosphorescent powder is the same as in Example 1; the foaming agent is a mixture of 4,4'-oxobisbenzenesulfonyl hydrazine (OBSH) and azodicarbonamide (AC), with a mass ratio of 4,4'-oxobisbenzenesulfonyl hydrazine to azodicarbonamide of 5:1; the crosslinking agent is bis-tert-butylperoxyisopropylbenzene (BIPB); the lubricant is magnesium stearate; the ultraviolet absorber is UV-944; and the antioxidant is antioxidant MB.

[0038] The above-mentioned method for preparing the luminescent material for slippers includes the following steps: Step 1: Dehydrate the ethylene-vinyl acetate copolymer (EVA) and thermoplastic polyester elastomer to a moisture content of ≤0.1%, add them to a mixer, heat to 130°C, and melt-mix until homogeneous; Step 2: Reduce the temperature inside the internal mixer to 120°C, then add the modified luminescent powder, filler, lubricant, ultraviolet absorber and antioxidant in sequence, and mix for 20 minutes. Step 3: Add foaming agent into the mixer, treat for 10 minutes at 110℃ and 50r / min, and then granulate by twin-screw extrusion to obtain masterbatch material; Step 4: Place the masterbatch material in the open mill and pass it through 5 times at a roller temperature of 100℃ and a roller gap of 0.5mm. Then cut it into sheets with a thickness of 2mm. Step 5: Place the sheet in the foaming molding machine and perform a two-stage heating and molding foaming process: the first stage is processed at 120℃ and 15MPa for 5 minutes; the second stage is processed at 165℃ and 12MPa for 8 minutes, followed by cooling and demolding. Step 6: Place the foamed material in an 80℃ oven for 20 minutes to relieve stress and obtain the luminescent material for slippers.

[0039] Example 4 A luminescent material for slippers differs from Example 1 in that the preparation method of the modified phosphorescent powder is different.

[0040] The preparation method of the modified phosphorescent powder includes: S1. Surface activation treatment: Weigh 0.2g of aminosilane coupling agent KH602 and add it to a mixture of 10mL ethanol and 5mL deionized water. After stirring thoroughly, add 1g of phosphorescent powder Zn3Ga2GeO8:Cr. 3+ The mixture was stirred at 40°C for 10 hours, then filtered, washed, and dried to obtain activated phosphorescent powder. S2, Surface modification treatment: 1 g of activated luminescent powder was weighed and added to 10 mL of anhydrous toluene. The mixture was dispersed evenly in an ice-water bath. Under nitrogen protection, 0.36 g of pyridine-3-sulfonyl chloride was gradually added with continuous stirring. After all the powder was added, the temperature was raised to 5 °C, and triethylamine was added dropwise at 1% of the mass of the activated luminescent powder. The mixture was kept at this temperature and stirred for 2 hours. After the reaction was complete, the reaction solution was filtered through a filter membrane, washed successively with toluene and methanol, and dried under vacuum at 50 °C for 4 hours to obtain the modified luminescent powder. Example 5 A luminescent material for slippers differs from Example 1 in that the preparation method of the modified phosphorescent powder is different.

[0041] The preparation method of the modified phosphorescent powder includes: S1. Surface activation treatment: Weigh 0.6g of aminosilane coupling agent KH792 and add it to a mixture of 20mL ethanol and 10mL deionized water. After stirring thoroughly, add 1g of phosphorescent powder La2MgZrO6:Cr. 3+ The mixture was stirred at 60°C for 20 hours, then filtered, washed, and dried to obtain activated phosphorescent powder. S2, Surface modification treatment: Weigh 1g of activated phosphorescent powder and add it to 20mL of anhydrous toluene. Disperse it evenly in an ice-water bath. Then, under nitrogen protection, gradually add 0.72g of pyridine-3-sulfonyl chloride while continuously stirring. After all the powder has been added, heat the mixture to 10℃ and add triethylamine dropwise. The amount added is 5% of the mass of the activated phosphorescent powder. Keep the mixture warm and stir for 3h. After the reaction is complete, filter the reaction solution through a filter membrane, wash it with toluene and methanol in sequence, and dry it under vacuum at 50℃ for 4h to obtain the modified phosphorescent powder.

[0042] Comparative Example 1 A luminescent material for slippers, differing from Example 1 in that the modified phosphorescent powder is replaced with conventional phosphorescent powder CaAl with a particle size of 20-30 μm. 12 O19 :Mn 4+ .

[0043] Comparative Example 2 A luminescent material for slippers, differing from Example 1 in that the modified luminescent powder is replaced with the activated luminescent powder in Example 1.

[0044] Comparative Example 3 A luminescent material for slippers, differing from Example 1 in that the modified phosphorescent powder is replaced with phosphorescent powder CaAl. 12 O 19 :Mn 4+ A mixture of pyridine-3-sulfonyl chloride in a mass ratio of 1:0.48.

[0045] To more clearly illustrate the present invention, the luminescent materials prepared in Example 1 and Comparative Examples 1-3 were subjected to mechanical property testing. The testing items included: The testing of tensile strength and elongation at break shall be performed in accordance with the standard GB / T 38018-2019. The test reference table for tear strength is GB / T 3903.12-2021; The fatigue resistance test reference standard GB / T 38018-2019, which tests the thickness change rate (50,000 compressions, 1200N force, 120 cycles / minute). The abrasion resistance test is the Akron abrasion test, referring to the standard GB / T 1689-2014 (Akron abrasion tester, load 26.7N). The test reference standard for resistance to damp heat aging is GB / T 3512-2014 (damp air aging chamber, 70℃ / 95%RH / 48h). The test results are shown in Table 1: Table 1 Performance testing of different luminous shoe sole materials As can be seen from Table 1, the luminescent material prepared in Example 1 of this invention not only has high strength and toughness, but also better wear resistance and resistance to damp heat aging. The indices of Comparative Example 1 are all inferior to those of Example 1, possibly because agglomeration defects lead to stress concentration, resulting in a decrease in strength, toughness, and other properties. The strength and toughness of Comparative Example 3 are slightly higher than those of Comparative Example 1, but lower than those of Comparative Example 2. This may be because the hydrolysis products of pyridine-3-sulfonyl chloride added to it have a certain degree of corrosiveness. Although the dispersibility is improved, it affects the performance of the system, especially the tensile strength, which decreases more severely after damp heat aging treatment. This may be because damp heat conditions accelerate the hydrolysis of the sulfonyl chloride groups.

[0046] Furthermore, the luminescent properties of the luminescent materials prepared in Example 1 and Comparative Examples 1-3 of this invention were tested. The tests included initial brightness and afterglow time, referring to standard SN / T 2558.7-2014 (D65 light source excitation).

[0047] The test results are shown in Table 2: Table 2 Performance testing of different luminous shoe sole materials As can be seen from Table 2, the luminescent material prepared in Example 1 of this invention has a higher initial brightness and a longer afterglow time. The low initial brightness of Comparative Example 1 may be due to agglomeration, while the short afterglow time may be due to the lack of surface modification of the phosphorescent powder, resulting in erosion by moisture. The initial brightness of Comparative Example 3 is even lower than that of Comparative Example 1, possibly because the sulfonyl chloride of pyridine-3-sulfonyl chloride used hydrolyzes and erodes the luminescent material, and the subsequent afterglow decays faster.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0049] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A luminescent material for slippers, characterized by, According to the weight parts, comprising: 70-80 parts of ethylene-vinyl acetate copolymer, 15-25 parts of thermoplastic polyester elastomer, 10-20 parts of modified luminescent powder, 8-16 parts of filler, 3.5-5.5 parts of foaming agent, 0.2-0.5 parts of crosslinking agent, 0.5-1 parts of lubricant, 0.3-0.5 parts of ultraviolet absorber and 1-2 parts of antioxidant.

2. The luminescent material for slippers according to claim 1, wherein The VA content of the ethylene-vinyl acetate copolymer is 18-28%, the density is 0.91-0.93 g / cm 3 , the melt index is 14-26 g / 10 min at 190°C under a load of 2.16 kg; the density of the thermoplastic polyester elastomer is 1.1-1.3 g / cm 3 , the melt index is 10-18 g / 10 min at 220°C under a load of 2.16 kg.

3. The luminescent material for slippers according to claim 1, wherein The filler is a mixture of nano calcium carbonate and talcum powder, and the mass ratio of nano calcium carbonate to talcum powder is 1-2:

1.

4. The luminescent material for slippers according to claim 1, wherein The foaming agent is a mixture of 4,4'-oxobisbenzenesulfonyl hydrazide and azodicarbonamide, and the mass ratio of 4,4'-oxobisbenzenesulfonyl hydrazide to azodicarbonamide is 3-5:0.5-1.

5. The luminescent material for slippers according to claim 1, wherein The crosslinking agent is dicumyl peroxide or di-tert-butyl peroxide isopropyl benzene; the lubricant is one of stearic acid, zinc stearate and magnesium stearate; the ultraviolet absorber is at least one of UV-531, UV-284, UV-326 and UV-944; and the antioxidant is at least one of antioxidant RD, antioxidant TNP and antioxidant MB.

6. The luminescent material for slippers according to claim 1, wherein The preparation method of the modified luminescent powder comprises: S1, weigh the amino silane coupling agent and add it into the mixed solution of ethanol and deionized water, stir uniformly, then add the luminescent powder, stir at 40-60℃ for 10-20h, then filter, wash and dry to obtain the activated luminescent powder; S2, weigh the activated luminescent powder and add it into anhydrous toluene, disperse uniformly under ice water bath, gradually add pyridine-3-sulfonyl chloride under nitrogen protection, continue to stir, after all the pyridine-3-sulfonyl chloride is added, warm to 5-10℃, drop a small amount of acid binding agent, and stir for 2-3h, after the reaction is completed, the reaction solution is filtered, washed and dried to obtain the modified luminescent powder.

7. The light-emitting material for slippers according to claim 1, wherein In the S1, the amino silane coupling agent is at least one of KH550 (γ-aminopropyl triethoxysilane), KH602 (N-(β-aminoethyl)-γ-aminopropyl methyldimethoxysilane), and KH792 (N-β-aminoethyl-γ-aminopropyl trimethoxysilane); the night light powder is a long afterglow luminescent material, specifically CaAl 12 O 19 :Mn 4+ , Zn3Ga2GeO8:Cr 3+ , Mg3Ga2GeO8:Cr 3+ , La2MgZrO6:Cr 3+ one or more mixtures.

8. The light-emitting material for slippers according to claim 1, wherein In S1, the mass-volume ratio of the luminescent powder, amino silane coupling agent, ethanol and deionized water is 1g:(0.2-0.6)g:(10-20)mL:(5-10)mL.

9. The light-emitting material for slippers according to claim 1, wherein In S2, the mass-volume ratio of the activated luminescent powder, pyridine-3-sulfonyl chloride and anhydrous toluene is 1g:(0.36-0.72)g:(10-20)mL; the acid binding agent is triethylamine, and the amount added is 1%-5% of the mass of the activated luminescent powder.

10. A method of producing the luminescent material for slippers according to claim 1, characterized by, The method comprises the following steps: Step 1, dehydrate ethylene-vinyl acetate copolymer (EVA) and thermoplastic polyester elastomer to a water content of ≤0.1%, add them into a banbury mixer, warm to 120-130℃, melt and mix until uniform; Step 2, reduce the temperature in the banbury mixer to 110-120℃, then add the modified luminescent powder, filler, lubricant, ultraviolet absorber and antioxidant in sequence, and mix for 10-20min; Step 3, add the foaming agent into the mixer, treat at 100-110℃ and 30-50r / min for 5-10min, then extrude and pelletize by double screw extruder to obtain the masterbatch material; Step 4, place the masterbatch material in an open mill, thin pass 5 times under the conditions of roll temperature 90-100℃ and roll gap 0.5mm, then cut into sheets with a thickness of 2mm; Step 5, the sheet was placed in a foaming molding machine, and was subjected to two-stage temperature increasing molding foaming treatment: the first stage was at 120℃ and 15MPa for 5min; the second stage was at 165℃ and 12MPa for 8min, and was cooled and demolded; Step 6, the foamed material was placed in an oven at 80℃ for 10-20min, and after stress elimination, the luminescent material for slippers was obtained.

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