Metal sulfides and their applications, resin compositions containing the metal sulfides

Abstract

This invention discloses a metal sulfide and its applications, as well as a resin composition containing the metal sulfide, relating to the field of sulfide technology. The metal sulfide of this invention is zinc sulfide, and the particle size distribution of the zinc sulfide satisfies the following relationship: 1.0 ≤ 1000 × (Dv75 - Dv25) / (Dv50). 2 ≤2.2, 3.0≤(Dv97×Dv50) / (Dv10×1000)≤12.8; where Dv10, Dv25, Dv50, Dv75, and Dv97 represent the particle size corresponding to a cumulative volume distribution percentage of 10%, 25%, 50%, 75%, and 97% for the zinc sulfide material, respectively, all in nm. By controlling the particle size distribution of the metal sulfide, the resin composition containing the metal sulfide exhibits high color stability and a low rate of change in whiteness value under alternating high and low temperature environments.

Description

[0001] This application is a divisional application of CN 116947089 A (application date: September 20, 2023, application number: 202311213034.4, invention title: metal sulfide and its application, resin composition containing the metal sulfide). Technical Field

[0002] This invention relates to the field of sulfide technology, specifically to a metal sulfide and its applications, and a resin composition containing the metal sulfide. Background Technology

[0003] Zinc sulfide (ZnS), as a white pigment, has a high refractive index and opacity. It is easy to disperse and does not easily agglomerate. When applied to plastics and coatings, it can give materials good covering and whitening effects.

[0004] Generally, resin materials containing zinc sulfide exhibit good color stability. However, as plastic products are increasingly used in outdoor applications, such as housings for outdoor electronic and electrical products, building door and window profiles, outdoor plastic seating, and garden fences, more stringent requirements are being placed on the color stability of these materials.

[0005] For example, with the development of the LED industry in recent years, the demand for high-power, high-brightness LED chips has been increasing. Current technology reports indicate that when LED components use polymer resin as the substrate and zinc sulfide as the white pigment, the material is prone to yellowing and discoloration under prolonged high-temperature irradiation. Therefore, for high-power, high-brightness LED components, such as housings and reflector brackets, not only is suitable whiteness required, but also good color stability.

[0006] In addition, in some more demanding environments, such as alternating high and low temperatures, resin materials containing zinc sulfide often exhibit more severe changes in whiteness.

[0007] Therefore, in order to further broaden the application range of zinc sulfide materials, especially to meet some harsh high and low temperature environmental conditions, it is necessary to provide a zinc sulfide material with small whiteness changes under harsh environments. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a metal sulfide and its application, and a resin composition containing the metal sulfide. By controlling the particle size distribution of the zinc sulfide material, the resin composition containing the zinc sulfide material has high color stability and a low whiteness value change rate under alternating high and low temperature environments.

[0009] To achieve the above objectives, in a first aspect, the present invention provides a metal sulfide, wherein the metal sulfide is a zinc sulfide material, and the particle size distributions Dv25, Dv50, and Dv75 of the zinc sulfide material satisfy the following relationship: 1.0 ≤ 1000 × (Dv75 - Dv25) / (Dv50). 2 ≤2.2; and,

[0010] The particle size distributions Dv10, Dv50, and Dv97 of the zinc sulfide material satisfy the following relationship: 3.0 ≤ (Dv97 × Dv50) / (Dv10 × 1000) ≤ 12.8;

[0011] Wherein, Dv10, Dv25, Dv50, Dv75, and Dv97 represent the particle sizes corresponding to the cumulative volume distribution percentage of the zinc sulfide material reaching 10%, 25%, 50%, 75%, and 97%, respectively, with the unit being nm.

[0012] In a preferred embodiment of the present invention, the particle size distributions Dv25, Dv50, and Dv75 of the zinc sulfide material satisfy the following relationship: 1.1 ≤ 1000 × (Dv75 - Dv25) / (Dv50) 2 ≤2.0.

[0013] As a preferred embodiment of the present invention, the particle size distributions Dv10, Dv50, and Dv97 of the zinc sulfide material satisfy the following relationship: 3.5 ≤ (Dv97 × Dv50) / (Dv10 × 1000) ≤ 12.0.

[0014] In a preferred embodiment of the present invention, the Dv50 of the zinc sulfide material is 550-850 nm.

[0015] In a more preferred embodiment of the present invention, the Dv50 of the zinc sulfide material is 630-780 nm.

[0016] In a preferred embodiment of the present invention, the zinc sulfide material satisfies at least one of the following characteristics (a) to (d):

[0017] (a) The Dv10 of the zinc sulfide material is 200–340 nm;

[0018] (b) The Dv25 of the zinc sulfide material is 350–500 nm;

[0019] (c) The Dv75 of the zinc sulfide material is 900–1500 nm;

[0020] (d) The Dv97 of the zinc sulfide material is 1600-4500 nm.

[0021] As a more preferred embodiment of the present invention, the zinc sulfide material satisfies at least one of the following characteristics (e) to (h):

[0022] (e) The Dv10 of the zinc sulfide material is 250–300 nm;

[0023] (f) The Dv25 of the zinc sulfide material is 380–480 nm;

[0024] (g) The Dv75 of the zinc sulfide material is 1000–1400 nm;

[0025] (h) The Dv97 of the zinc sulfide material is 3200-4300 nm.

[0026] As a preferred embodiment of the present invention, the particle size distribution Dv50 and the loose bulk density BD of the zinc sulfide material satisfy the following relationship: 18≤Dv50 / (lgBD×10)≤27;

[0027] Wherein, the unit of Dv50 is nm, and the unit of BD is kg / m³. 3 .

[0028] In a preferred embodiment of the present invention, the BD of the zinc sulfide material is 600-1200 kg / m³. 3 .

[0029] As a preferred embodiment of the present invention, the loose bulk density BD and the tapped bulk density TD of the zinc sulfide material satisfy the following relationship: (TD-BD) / TD*100%≤40%;

[0030] The units for TD and BD are both kg / m³. 3 .

[0031] In a preferred embodiment of the present invention, the TD of the zinc sulfide material is 900-1500 kg / m³. 3 .

[0032] In a preferred embodiment of the present invention, the BET of the zinc sulfide material is 8.5–11.5 m. 2 / g.

[0033] In a second aspect, the present invention provides the use of the metal sulfide described above in the preparation of a resin composition.

[0034] In a third aspect, the present invention provides a resin composition comprising the following components in parts by weight:

[0035] 100 parts of resin, and 0.5 to 10 parts of the aforementioned metal sulfide.

[0036] In a preferred embodiment of the present invention, the resin includes at least one of polyethylene (PE), polypropylene (PP), polyamide (PA), polycarbonate (PC), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), epoxy resin (EP), acrylonitrile-butadiene-styrene copolymer (ABS), and styrene-acrylonitrile copolymer (AS).

[0037] The beneficial effects of this invention are as follows:

[0038] The metal sulfide described in this invention has a suitable particle size distribution, which makes the resin composition containing the metal sulfide highly stable in color and has a low whiteness change rate under alternating high and low temperature environments. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In this invention, the technical features described in an open-ended manner include both closed-ended technical solutions composed of the listed features and open-ended technical solutions that include the listed features.

[0041] In this invention, numerical ranges are involved. Unless otherwise specified, the numerical ranges are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe features or characteristics, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are included.

[0042] In this invention, there are no particular limitations on the specific dispersion and stirring methods.

[0043] Unless otherwise specified, all reagents or instruments used in this invention are commercially available products.

[0044] To address the issue of color changes in existing resin compositions containing zinc sulfide under high and low temperature environments.

[0045] This invention provides a metal sulfide, wherein the metal sulfide is zinc sulfide material, and the particle size distribution of the zinc sulfide material, Dv25, Dv50, and Dv75, satisfies the following relationship: 1.0 ≤ 1000 × (Dv75 - Dv25) / (Dv50). 2 ≤2.2; and,

[0046] The particle size distributions Dv10, Dv50, and Dv97 of the zinc sulfide material satisfy the following relationship: 3.0 ≤ (Dv97 × Dv50) / (Dv10 × 1000) ≤ 12.8;

[0047] Wherein, Dv10, Dv25, Dv50, Dv75, and Dv97 represent the particle sizes corresponding to the cumulative volume distribution percentage of the zinc sulfide material reaching 10%, 25%, 50%, 75%, and 97%, respectively, with the unit being nm.

[0048] This study found that by controlling the particle size distribution of zinc sulfide, when the Dv10, Dv25, Dv50, Dv75, and Dv97 of the zinc sulfide material satisfy the above two relationships, the zinc sulfide material can not only effectively play a masking role in the resin, but also has a suitable particle size distribution, making the dispersion state of the zinc sulfide material in the resin more uniform and stable. Zinc sulfide, as an inorganic material, has a high interfacial bonding force with the organic resin. Under harsh temperature conditions, the zinc sulfide material of this invention exhibits superior stability, is less prone to decomposition or degradation to produce colored substances, or to adverse reactions or interactions with other components in the resin, and is less likely to experience a weakening of its whitening and masking effects on the resin due to volatilization. Furthermore, the addition of the zinc sulfide material of this invention to the resin can greatly improve the stability of the resin composition, thus making it less susceptible to color changes caused by environmental temperature variations, thereby improving the color stability of the resin composition containing this zinc sulfide material.

[0049] In the relation 1.0≤1000×(Dv75-Dv25) / (Dv50) 2 In ≤2.2: The smaller the value of (Dv75-Dv25), the more concentrated the particle size distribution of the zinc sulfide material; however, if the value of (Dv75-Dv25) is too small, the particle size of the zinc sulfide particles is too uniform, making it impossible to achieve a mixture of particles of different sizes, thus having limited improvement on the color stability of the material; furthermore, 1000×(Dv75-Dv25) and (Dv50) 2 The ratio should be in the range of 1.0 to 2.2, where Dv50 is the median particle size of the zinc sulfide material. 2 Too large or too small, resulting in 1000×(Dv75-Dv25) / (Dv50). 2When the value is less than 1.0 or greater than 2.2, zinc sulfide materials may exhibit severe intergranular cohesion, poor dispersibility, reduced covering ability, or decreased stability, which in turn leads to unsatisfactory color stability of resins containing zinc sulfide materials and a high rate of whiteness change under high and low temperature aging conditions.

[0050] In the relationship 3.0≤(Dv97×Dv50) / (Dv10×1000)≤12.8, Dv97 represents the particle size corresponding to a cumulative volume distribution percentage of 97% for the zinc sulfide material, which is the average particle size of relatively large particles; similarly, Dv10 represents the average particle size of relatively small particles. By controlling the ratio of (Dv97×Dv50) to (Dv10×1000) to satisfy 3.0~12.8, a moderate difference in particle size among the zinc sulfide materials is achieved, thereby greatly improving the interfacial bonding force between zinc sulfide as an inorganic material and organic resin, and avoiding the decrease in color stability caused by phase separation in resin compositions containing zinc sulfide under harsh temperature conditions.

[0051] The present invention does not limit the detection methods for Dv10, Dv25, Dv50, Dv75, and Dv97. Those skilled in the art can detect the particle size distribution of zinc sulfide materials using conventional technical means. For example, the particle size distribution can be determined by referring to GB / T19077-2016 Particle Size Distribution Laser Diffraction Method and using a laser particle size analyzer, such as the Omec LS-POP(9) laser particle size analyzer.

[0052] In one embodiment, the particle size distributions Dv25, Dv50, and Dv75 of the zinc sulfide material satisfy the following relationship: 1.1 ≤ 1000 × (Dv75 - Dv25) / (Dv50) 2 ≤2.0.

[0053] In one embodiment, the particle size distributions Dv10, Dv50, and Dv97 of the zinc sulfide material satisfy the following relationship: 3.5 ≤ (Dv97 × Dv50) / (Dv10 × 1000) ≤ 12.0.

[0054] This study found that when the particle size distribution of zinc sulfide material further satisfies the above-mentioned relationship range, the color stability of the resin composition containing zinc sulfide material is better, and the whiteness value of the resin composition changes less after alternating high and low temperature treatment.

[0055] In one embodiment, the Dv50 of the zinc sulfide material is 550-850nm. For example, the Dv50 of the zinc sulfide material can be 605nm, 632nm, 680nm, 750nm, 772nm, 800nm, or 837nm.

[0056] In one preferred embodiment, the Dv50 of the zinc sulfide material is 630–780 nm.

[0057] In one embodiment, the zinc sulfide material satisfies at least one of the following characteristics (a) to (d):

[0058] (a) The Dv10 of the zinc sulfide material is 200–340 nm;

[0059] (b) The Dv25 of the zinc sulfide material is 350–500 nm;

[0060] (c) The Dv75 of the zinc sulfide material is 900–1500 nm;

[0061] (d) The Dv97 of the zinc sulfide material is 1600-4500 nm.

[0062] In one preferred embodiment, the Dv10 of the zinc sulfide material is 250-300 nm. For example, the Dv10 of the zinc sulfide material can be 265 nm, 270 nm, 272 nm, or 278 nm.

[0063] In one preferred embodiment, the Dv25 of the zinc sulfide material is 380-480 nm. For example, the Dv25 of the zinc sulfide material can be 408 nm, 415 nm, 420 nm, 430 nm, or 446 nm.

[0064] In one preferred embodiment, the Dv75 of the zinc sulfide material is 1000-1400nm. For example, the Dv75 of the zinc sulfide material can be 1085nm, 1150nm, 1220nm, 1350nm, or 1400nm.

[0065] In one preferred embodiment, the Dv97 of the zinc sulfide material is 3200-4300nm. For example, the Dv97 of the zinc sulfide material can be 3400nm, 3500nm, 3700nm, 3950nm, 4000nm, 4150nm, or 4260nm.

[0066] In one embodiment, the particle size distribution Dv50 and the loose bulk density BD of the zinc sulfide material satisfy the following relationship: 18≤Dv50 / (lgBD×10)≤27;

[0067] Wherein, the unit of Dv50 is nm, and the unit of BD is kg / m³. 3 .

[0068] The bulk density (BD) reflects the interparticle volume of zinc sulfide material and, to some extent, the morphology of zinc sulfide particles. When the zinc sulfide material satisfies Dv50 / (lgBD×10) of 18–27, the particle size distribution of the zinc sulfide material is moderate, and the particle morphology and interparticle volume of zinc sulfide are suitable, which contributes to better color stability of resin compositions containing zinc sulfide.

[0069] In one embodiment, the BD of the zinc sulfide material is 650–1200 kg / m³. 3 For example, the BD of the zinc sulfide material can be 660 kg / m³. 3 670kg / m 3 680kg / m 3 700kg / m 3 900kg / m 3 1150kg / m 3 .

[0070] In one preferred embodiment, the BD of the zinc sulfide material is 660–800 kg / m³. 3 .

[0071] In one embodiment, the loose bulk density BD and the tapped bulk density TD of the zinc sulfide material satisfy the following relationship: (TD-BD) / TD*100%≤40%;

[0072] The units for TD and BD are both kg / m³. 3 .

[0073] In one preferred embodiment, the loose bulk density BD and the tapped bulk density TD of the zinc sulfide material satisfy the following relationship: 20≤(TD-BD) / TD*100%≤35%.

[0074] The ratio of (TD-BD) to TD is equivalent to the compressibility of zinc sulfide material. The compressibility of zinc sulfide material is related to the regularity of the morphology and particle size distribution of zinc sulfide particles. When (TD-BD) / TD*100% is within the above-mentioned preferred range, the zinc sulfide material has a better effect on improving color stability.

[0075] In one embodiment, the TD of the zinc sulfide material is 900–1500 kg / m³. 3 For example, the TD of the zinc sulfide material can be 950 kg / m³. 3 970kg / m 3 1000kg / m 3 1050kg / m 3 1100kg / m 31200kg / m 3 1420kg / m 3 .

[0076] In one preferred embodiment, the TD of the zinc sulfide material is 950–1150 kg / m³. 3 .

[0077] This invention does not limit the methods for detecting the loose bulk density (BD) and tapped bulk density (TD) of zinc sulfide materials. Those skilled in the art can detect the BD and TD of zinc sulfide materials using conventional techniques. For example, the following method can be used: The zinc sulfide material is allowed to fall naturally into a 100cm stainless steel container by vibrating the sample supply device. 3 The zinc sulfide material is poured into a cylindrical container until it is full. Excess zinc sulfide material is scraped off with a blade. The measured density is then converted to kg / m³. 3 This is the loose bulk density. Then, in a 100cm stainless steel container... 3 The cylindrical container was covered, and the zinc sulfide material was allowed to flow down by vibrating the sample supply device. Compaction was performed under the following conditions: a stroke length (compaction height) of 18 mm, a compaction speed of 60 times / minute, and 180 compaction cycles. Then, excess zinc sulfide material was scraped off the container with a blade. The measured density was then converted to kg / m³. 3 This is the tapped bulk density.

[0078] One embodiment of the present invention provides the application of the metal sulfide described above in the preparation of resin compositions.

[0079] One embodiment of the present invention provides a resin composition comprising the following components in parts by weight:

[0080] 100 parts of resin, and 0.5 to 10 parts of the aforementioned metal sulfide.

[0081] In one embodiment, the resin includes at least one of polyethylene (PE), polypropylene (PP), polyamide (PA), polycarbonate (PC), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), epoxy resin (EP), acrylonitrile-butadiene-styrene copolymer (ABS), and styrene-acrylonitrile copolymer (AS).

[0082] In practical applications, depending on actual performance requirements, the resin composition may also include 0 to 10 parts by weight of other additives, wherein the other additives are selected from at least one of lubricants, yellowing inhibitors, antioxidants, heat stabilizers, light stabilizers, other polymers, impact modifiers, flame retardants, fluorescent whitening agents, plasticizers, thickeners, antistatic agents, mold release agents, and nucleating agents.

[0083] It should be noted that the preparation method of the resin composition is not particularly limited in this invention, and those skilled in the art can prepare it into a resin composition according to conventional methods.

[0084] For example, the method for preparing the resin composition is as follows:

[0085] The resin, metal sulfide and other additives are mixed and added to an extruder. After melt mixing and extrusion granulation, the resin composition is obtained.

[0086] Specifically, the extruder can be a twin-screw extruder, wherein the screw length-to-diameter ratio of the twin-screw extruder is 36 to 72:1, the screw speed is 100 to 500 rpm, and the melt temperature of the twin-screw extruder is 180 to 280°C.

[0087] After high and low temperature alternating aging test, the whiteness value of the above resin composition changes by ≤10%. The specific conditions of the high and low temperature alternating aging test are as follows: after the resin composition is injection molded into a 2cm thick sample, it is placed in a high and low temperature test chamber. The test conditions are: low temperature -10±2℃ for 12 hours, then high temperature 80±3℃ for 12 hours, with a temperature switching time of less than 30 seconds, which is one cycle; a total of 10 cycles are performed.

[0088] The present invention is further illustrated below with specific embodiments:

[0089] Examples and Comparative Examples

[0090] The embodiments and comparative examples of the present invention respectively prepare a zinc sulfide material. The preparation of the zinc sulfide material includes the following steps:

[0091] Zinc oxide was ground into powder and then dispersed in a 20 wt.% sulfuric acid solution, with the pH of the system controlled at 5-7.

[0092] Add sodium sulfide, wherein the weight ratio of sodium sulfide to zinc oxide is 1:(2-2.5), and react for 15-18 hours at 80-120℃ and 100-200 rpm, while controlling the pH of the reaction system to be 6-8.

[0093] After the reaction is complete, the product is cooled, separated and removed. It is then washed three times with distilled water, filtered, dried, crushed and sieved. By controlling the degree of crushing and sieving conditions, zinc sulfide materials with different particle size distributions, loose bulk density and tapped bulk density are obtained.

[0094] Specifically, the particle size distribution, loose bulk density, and tapped bulk density of the zinc sulfide materials in Examples 1-9 and Comparative Examples 1-3 are shown in Table 1.

[0095] Table 1

[0096]

[0097]

[0098] The formulas satisfied by each embodiment and comparative example after calculation are shown in Table 2.

[0099] Using the zinc sulfide materials prepared in the various embodiments and comparative examples, and as white pigments, resin compositions were prepared according to the following component contents (parts by weight): 100 parts polyamide resin, 3 parts white pigment, and 1 part antioxidant 1010.

[0100] The resin composition is prepared according to the following steps:

[0101] Polyamide resin, white pigment (zinc sulfide material), and antioxidant 1010 are mixed and added to a twin-screw extruder. The screw speed of the twin-screw extruder is 300 rpm, and the melt temperature is 260°C. After melt mixing, extrusion granulation, and other processes, the resin composition is obtained.

[0102] The color stability of the resin composition was tested, and the results are shown in Table 2. The specific testing method is as follows:

[0103] After the resin composition was injection molded into a 2cm thick sample, the whiteness value (W1) was measured. Then, the resin composition was subjected to a high and low temperature alternating aging test. The specific conditions of the high and low temperature alternating aging test were as follows: the resin composition injection molded sample was placed in a high and low temperature test chamber. The test conditions were: low temperature -10±2℃ for 12 hours, then high temperature 80±3℃ for 12 hours, with a temperature switching time of less than 30 seconds, which constituted one cycle; a total of 10 cycles were performed. The whiteness value (W2) after aging was measured again, and the whiteness value change rate (△W) was calculated, △W=(W1-W2) / W1*100%.

[0104] The whiteness value is detected using the following method:

[0105] The chromaticity of the above samples was measured using an SD5000 spectrophotometer (manufactured by Nippon Denshoku Kogyo Co., Ltd.). The luminance (L), red value (a), and yellow value (b) were calculated using the Hinds difference formula. The whiteness (W) was calculated using the following formula: W = 100 - [(100 - L)]. 2 +a 2 +b 2 ] 1 / 2 .

[0106] Table 2

[0107]

[0108] As can be seen from Table 2, the zinc sulfide materials in each embodiment of the present invention can effectively improve the color stability of the resin composition. Under high and low temperature alternating aging conditions, the whiteness value of the resin composition containing the zinc sulfide materials in each embodiment changes by less than 10%.

[0109] Based on the test results of Examples 1-4 and Examples 5-7, when the particle size distribution of the zinc sulfide material further satisfies: 1.1 ≤ 1000 × (Dv75 - Dv25) / (Dv50) 2 When the values ​​are ≤2.0 and 3.5≤(Dv97×Dv50) / (Dv10×1000)≤12.0, the resin composition containing this zinc sulfide material exhibits better color stability, and the whiteness value of the resin composition changes less after alternating high and low temperature treatment.

[0110] According to Examples 1-4 and Examples 8 and 9, it can be seen that when the zinc sulfide material further satisfies 18≤Dv50 / (lgBD×10)≤27 and (TD-BD) / TD*100%≤40%, the whiteness stability of the resin is improved more effectively and the whiteness value change rate of the resin composition is relatively lower.

[0111] It should be noted that although only polyamide resin is used as the resin component of the resin composition in the embodiments of the present invention, in fact, when the polyamide resin is replaced with other thermoplastic resins or thermosetting resins, such as polyethylene, polypropylene, polycarbonate, polybutylene terephthalate, polyethylene terephthalate, epoxy resin, acrylonitrile-butadiene-styrene copolymer or styrene-acrylonitrile copolymer, a similar color stability effect can be achieved.

[0112] Furthermore, when the zinc sulfide material of Example 1 was used as the white pigment, and a resin composition was prepared with a component content of 100 parts polyamide resin, 10 parts white pigment, and 1 part antioxidant 1010, the whiteness value change rate was 5.1%; when the zinc sulfide material of Example 1 was used as the white pigment, and a resin composition was prepared with a component content of 100 parts polyamide resin, 0.1 parts white pigment, and 1 part antioxidant 1010, the whiteness value change rate was 8.9%.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A metal sulfide, characterized in that, The metal sulfide is zinc sulfide material, and the particle size distribution of the zinc sulfide material, Dv25, Dv50, and Dv75, satisfies the following relationship: 1.0 ≤ 1000 × (Dv75 - Dv25) / (Dv50). 2 ≤2.2; and, The particle size distributions Dv10, Dv50, and Dv97 of the zinc sulfide material satisfy the following relationship: 3.0 ≤ (Dv97 × Dv50) / (Dv10 × 1000) ≤ 12.8; Wherein, Dv10, Dv25, Dv50, Dv75, and Dv97 represent the particle sizes corresponding to the cumulative volume distribution percentage of the zinc sulfide material reaching 10%, 25%, 50%, 75%, and 97%, respectively, with the unit being nm; The Dv50 of the zinc sulfide material is 550–850 nm; The loose bulk density BD and tapped bulk density TD of the zinc sulfide material satisfy the following relationship: (TD-BD) / TD*100%≤40%; where the units of TD and BD are both kg / m³. 3 .

2. The metal sulfide according to claim 1, characterized in that, The particle size distributions Dv25, Dv50, and Dv75 of the zinc sulfide material satisfy the following relationship: 1.1 ≤ 1000 × (Dv75 - Dv25) / (Dv50) 2 ≤2.

0.

3. The metal sulfide according to claim 1, characterized in that, The particle size distributions Dv10, Dv50, and Dv97 of the zinc sulfide material satisfy the following relationship: 3.5 ≤ (Dv97 × Dv50) / (Dv10 × 1000) ≤ 12.

0.

4. The metal sulfide according to any one of claims 1 to 3, characterized in that, Includes at least one of the features described in (a) to (d) below: (a) The Dv10 of the zinc sulfide material is 200–340 nm; (b) The Dv25 of the zinc sulfide material is 350–500 nm; (c) The Dv75 of the zinc sulfide material is 900–1500 nm; (d) The Dv97 of the zinc sulfide material is 1600-4500 nm.

5. The metal sulfide according to claim 1, characterized in that, The particle size distribution Dv50 and loose bulk density BD of the zinc sulfide material satisfy the following relationship: 18≤Dv50 / (lgBD×10)≤27; Wherein, the unit of Dv50 is nm, and the unit of BD is kg / m³. 3 .

6. The metal sulfide according to claim 1, characterized in that, The BD of the zinc sulfide material is 600-1200 kg / m³. 3 .

7. The metal sulfide according to claim 1, characterized in that, The TD of the zinc sulfide material is 900-1500 kg / m³. 3 .

8. The use of the metal sulfide according to any one of claims 1 to 7 in the preparation of resin compositions.

9. A resin composition, characterized in that, The components include the following parts by weight: 100 parts of resin, and 0.5 to 10 parts of the metal sulfide according to any one of claims 1 to 7.

10. The resin composition according to claim 9, characterized in that, The resin includes at least one of polyethylene, polypropylene, polyamide, polycarbonate, polybutylene terephthalate, polyethylene terephthalate, epoxy resin, acrylonitrile-butadiene-styrene copolymer, and styrene-acrylonitrile copolymer.

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