Flame-retardant runway particles and preparation method thereof
By compounding nitrogen-phosphorus flame retardants and modified graphite into plastic track granules, along with modified micro-fine talc and other components, the problem of flammability of plastic tracks has been solved, achieving high-efficiency flame retardancy, smoke suppression, and improved mechanical properties.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-22
- Publication Date
- 2026-03-31
AI Technical Summary
Existing plastic running track granules are flammable, posing a fire hazard and affecting safety and environmental performance.
A nitrogen-phosphorus flame retardant is compounded with modified graphite and combined with modified fine talc powder to form a carbon layer that isolates gas and heat transfer. Naphthenic oil, silicone powder, coupling agent and antioxidant are used to optimize the formulation of rubber and plastic elastomer and improve flame retardant and smoke suppression performance.
It significantly improves the flame retardant effect of runway particles, reduces smoke and dust density, enhances mechanical properties and service life, and reduces production costs.
Smart Images
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Abstract
Description
Technical Field
[0001] This application relates to the field of plastic running track materials, and more specifically, it relates to a flame-retardant running track granule and a method for preparing the same. Background Technology
[0002] Plastic running tracks are composed of polyurethane prepolymer, mixed polyether, waste tire rubber, EPDM rubber granules or PU particles, pigments, additives, fillers, etc. Plastic running tracks have the characteristics of good flatness, high compressive strength, appropriate hardness and elasticity, and stable physical properties, which are conducive to athletes' speed and technique, effectively improving athletic performance and reducing the rate of falls and injuries. They are an internationally recognized material for outdoor sports flooring.
[0003] The related technology provides a running track granule, comprising a rubber elastomer, filler, plasticizer, vulcanizing agent, foaming agent, and other additives. The rubber elastomer comprises a thermoplastic elastomer and a thermosetting rubber in a 1:1 mass ratio. The filler is selected from one or more of calcium carbonate, talc, clay, and kaolin. By compounding the thermoplastic elastomer and thermosetting rubber and adding wear-resistant filler, the related technology improves the aging resistance, wear resistance, and high-temperature resistance of the running track granules while ensuring their environmental advantages.
[0004] However, common track granules are flammable materials that can easily cause fires during use, posing a great threat to people's property and personal safety. Therefore, functional modification of track granules to enhance their flame retardancy is one of the urgent problems to be solved. Summary of the Invention
[0005] In order to give the track granules better flame retardant properties, this application provides a flame retardant track granule and a method for preparing the same.
[0006] In the first aspect, this application provides a flame-retardant running track granule, which adopts the following technical solution: A flame-retardant running track granule comprises the following components in parts by weight: 100 parts of rubber and plastic elastomer 15-30 parts of modified fine talc powder 35-45 parts of nitrogen-phosphorus flame retardant 8-12 parts of modified graphite 8-15 parts of naphthenic oil Silicone powder 0.5-2 parts 0.5-2 parts of coupling agent Anti-aging agent 0.5-2 parts, Antioxidant 0.5-2 parts 3-8 parts foaming agent.
[0007] By adopting the above technical solutions, nitrogen-phosphorus flame retardants have the advantages of low smoke, low toxicity, high efficiency, and halogen-free properties. Modified graphite rapidly expands on the surface of track particles to form a carbon layer during flame retardation, blocking gas and reducing heat transfer. Combining nitrogen-phosphorus flame retardants with modified graphite can quickly smother flames and improve the flame retardant effect. Moreover, graphite is relatively inexpensive, achieving the goal of cost reduction and efficiency improvement. Modified micro-fine talc powder, combined with nitrogen-phosphorus flame retardants and modified graphite, plays a role in isolating gas and heat transfer, and has a smoke-suppressing effect. It can absorb smoke and dust, reduce the amount and density of smoke, and further improve the flame retardant effect. Naphthenic oil can reduce the interaction forces between components, increase the plasticity and fluidity of the system, and improve the processing performance of runway particles; silicone powder is beneficial to further improve the fluidity of the system, improve processing performance, and increase the toughness of runway particles; coupling agents are beneficial to the dispersion of modified graphite and modified fine talc powder, and increase the crosslinking density of the system, thereby improving the mechanical properties of runway particles; anti-aging agents and antioxidants are beneficial to extending the service life of runway particles and slowing down their aging. This application utilizes a combination of nitrogen-phosphorus flame retardants, modified graphite, and modified micro-fine talc powder to give the running track granules superior flame retardant and smoke-suppressing properties, greatly improving the safety of the plastic running track granules and achieving the goals of safety, environmental protection, and durability.
[0008] Preferably, the rubber-plastic elastomer is selected from one or more of hydrogenated styrene-butadiene block copolymer, styrene-butadiene block copolymer, polypropylene, modified ethylene-octene copolymer, and modified polyphenylene ether.
[0009] By adopting the above technical solutions, hydrogenated styrene-butadiene block copolymer (SEBS) exhibits good UV stability, antioxidant properties, and thermal stability, as well as excellent mechanical properties, enabling track granules to possess good high-temperature resistance and superior mechanical strength. Styrene-butadiene block copolymer (SBS) possesses excellent tensile strength and elasticity, which is beneficial for enhancing the toughness of track granules. Polypropylene (PP) has excellent mechanical properties, good heat resistance, and good chemical stability, which can impart excellent high-temperature resistance and chemical resistance to track granules. Modified ethylene-octene copolymer has excellent aging resistance and good toughness, which can improve the aging resistance of track granules and enhance their mechanical properties. Modified polyphenylene ether has good heat resistance and flame retardancy, and possesses a certain degree of self-extinguishing properties, which can improve the flame retardancy of track granules and also provide good mechanical strength.
[0010] Preferably, the modified ethylene-octene copolymer is a maleic anhydride-grafted ethylene-octene copolymer. Further, the grafting rate of maleic anhydride is 1.2%.
[0011] By adopting the above technical solution, after maleic anhydride grafting modification, a strong polar side mark is introduced on the nonpolar molecular backbone of POE, making maleic anhydride grafted POE a bridge to improve the adhesion and compatibility between polar and nonpolar materials in the system. It plays a better role in toughening and promoting compatibility, which is conducive to further enhancing the physical properties of runway particles, improving the aging resistance of runway particles and optimizing processability.
[0012] Preferably, the modification method of the modified polyphenylene ether includes: blending the polyphenylene ether with a polypropylene and an ethylene-octene copolymer; wherein the mass ratio of the polyphenylene ether, polypropylene, and ethylene-octene copolymer in the modified polyphenylene ether is (3-5):1:(0.4-1.5).
[0013] Preferably, in the modified polyphenylene ether, the mass ratio of polyphenylene ether, polypropylene, and ethylene-octene copolymer is 4:1:1.
[0014] Preferably, the modified polyphenylene ether further includes an antioxidant comprising 1-2% by mass of the total mass of the polypropylene, ethylene-octene copolymer, and polyphenylene ether.
[0015] Preferably, the method for preparing the modified polyphenylene ether includes: According to the formula, polypropylene, polyphenylene ether, and ethylene-octene copolymer are mixed, and an antioxidant of the formula amount is added. After mixing evenly, the mixture is extruded and granulated to obtain modified polyphenylene ether.
[0016] By adopting the above technical solution, the polyphenylene ether (PPE) is modified by blending and the blending ratio of PPE, polypropylene, and ethylene-octene copolymer is controlled. This improves the flowability of PPE, enhances its processability, reduces the possibility of stress cracking, and gives the runway particles better mechanical strength and toughness, as well as excellent aging resistance and high-temperature resistance. When the ratio of PPE, polypropylene, and ethylene-octene copolymer is 4:1:1, the runway particles can achieve the best comprehensive performance.
[0017] Preferably, the modified micro-fine talc powder is obtained by surface modification of micro-fine talc powder with a titanate coupling agent; the mass of the titanate coupling agent is 0.3%-0.8% of the mass of the micro-fine talc powder.
[0018] Preferably, the particle size of the modified micro-fine talc powder is 1000-1500 mesh.
[0019] Preferably, the titanate coupling agent is selected from one or more of TC-27, TC-WT, TC-3, TC-2, TC-9, TC-114, and TC-F.
[0020] Preferably, the method for preparing the modified micro-fine talc powder includes: According to the formula, at 100℃ and under stirring conditions, add titanate coupling agent to fine talc powder and stir at 380-450 r / min for 15-30 min to obtain modified fine talc powder.
[0021] By adopting the above technical solution, the isopropoxy group of the titanate coupling agent reacts with the surface hydroxyl group of the fine talc powder, which reduces the surface tension of the fine talc powder, improves the surface activity, promotes the compatibility of the fine talc powder with the rubber and plastic elastomer organic system, improves the dispersion uniformity of the fine talc powder, and helps to give full play to the flame retardant and smoke suppressing effect of the fine talc powder.
[0022] Preferably, the modified graphite is obtained by surface modification of expanded graphite with a silane coupling agent; the mass of the silane coupling agent is 8-12% of the mass of the expanded graphite.
[0023] Preferably, the silane coupling agent is selected from one or more of KH-550, KH-540, KH-902, KH-554, KH-590, KH-602, KH-703, and KH-792.
[0024] Preferably, the method for preparing the modified graphite includes: According to the formula, under stirring conditions at 80℃, add silane coupling agent to expanded graphite and stir at a speed of 80-120 r / min for 15-30 min to obtain modified graphite.
[0025] By adopting the above technical solution, the silane coupling agent reacts with the hydroxyl groups on the graphite surface, improving the compatibility of graphite with the organic system of rubber and plastic elastomers, increasing the uniformity of graphite dispersion, which is beneficial to improving the flame retardant effect of graphite and further improving the flame retardant performance of runway particles.
[0026] Preferably, the nitrogen-phosphorus flame retardant is one or more of FR-601 flame retardant, OP-935 flame retardant, FP-110 flame retardant, SPB-100 flame retardant and triazine flame retardant; more preferably, it is FR-601 flame retardant.
[0027] Preferably, the foaming agent is supercritical carbon dioxide.
[0028] By adopting the above technical solutions and using physical foaming, the foaming process is stable and environmentally friendly; supercritical carbon dioxide has high safety, good environmental performance, and excellent flame retardant effect.
[0029] Secondly, this application provides a method for preparing flame-retardant running track granules, employing the following technical solution: A method for preparing flame-retardant running track granules includes the following steps: Mix the formulated amounts of rubber and plastic elastomer and naphthenic oil, and stir to obtain premix one; Mix the prescribed amounts of nitrogen and phosphorus flame retardant, antioxidant, silicone powder, and coupling agent, and stir to obtain premix two. According to the formula, mix premix one, premix two, modified fine talc powder, and modified graphite, heat and stir to obtain a mixture. Put the mixture into an extrusion device, add the prescribed amount of foaming agent, and then extrude, stretch, cool, and pelletize to obtain flame-retardant track granules.
[0030] By adopting the above technical solutions, it is possible to produce track granules with better flame retardant and smoke suppression properties, good mechanical properties, good chemical resistance, and good durability, which is beneficial to giving plastic track better flame retardant and smoke suppression effects and improving the safety of plastic track use.
[0031] Preferably, the extrusion step of the mixture specifically includes: feeding the mixture into a two-stage extruder, the two-stage extruder including a first-stage twin-screw extruder and a second-stage single-screw extruder; after the mixture is extruded by the first-stage twin-screw extruder, it enters the second-stage single-screw extruder, and a formulated amount of foaming agent is injected into the second-stage single-screw extruder; after extrusion, stretching, cooling, and pelletizing, flame-retardant racetrack pellets are obtained.
[0032] Preferably, the processing temperature of the first-stage twin-screw extruder is 180-200℃; and the processing temperature of the second-stage single-screw extruder is 190℃.
[0033] By adopting the above technical solutions, the use of a two-stage extruder can improve the processing performance of raw materials, help reduce surface defects in flame-retardant racetrack particles, and improve production quality.
[0034] In summary, this application has the following beneficial effects: 1. This application combines nitrogen-phosphorus flame retardants with modified graphite, which can quickly smother flames and improve the flame retardant effect; moreover, graphite is relatively inexpensive, which can achieve the purpose of cost reduction and efficiency improvement; the modified fine talc powder, combined with nitrogen-phosphorus flame retardants and modified graphite, plays a role in isolating gas and heat transfer, and has a smoke-suppressing effect, which can absorb smoke dust, reduce smoke amount and smoke density, and further improve the flame retardant effect; 2. In this application, one or more of the following are preferred as rubber-plastic elastomers: hydrogenated styrene-butadiene block copolymer, styrene-butadiene block copolymer, polypropylene, modified ethylene-octene copolymer, and modified polyphenylene ether. These can give the flame-retardant track particles better mechanical properties and impart certain flame retardancy to the track particles. 3. In this application, the polyphenylene ether is preferably modified by blending and the blending ratio of polyphenylene ether, polypropylene, and ethylene-octene copolymer is controlled, which can improve the flowability of polyphenylene ether, improve its processability, give the runway particles better mechanical strength and toughness, and have excellent aging resistance and high temperature resistance. Detailed Implementation
[0035] To further aid in understanding the technical solution of this invention, several specific implementation examples are provided below to describe the technical solution of this invention in more detail. All of these described embodiments are only some embodiments of this invention, and not all of them. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments; and the reaction devices, elastomers, antioxidants, coupling agents, anti-aging agents, etc. involved in the following embodiments are all commercially available.
[0036] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.
[0037] The following examples further illustrate the present invention, but the invention is not limited thereto. Unless otherwise specified in the examples, all percentages (%) are mass percentages.
[0038] Preparation Example Preparation Example 1 This preparation example provides a modified polyphenylene ether, prepared by the following method: Polyphenylene ether, polypropylene, and ethylene-octene copolymer were added to a high-speed mixer at a mass ratio of 4:1:1 and mixed evenly to obtain a mixed elastomer. Antioxidant 1010 (0.1% by mass of the total mixed elastomer) and antioxidant 168 (0.5% by mass of the total mixed elastomer) were added to the elastomer and mixed evenly. The above mixture was fed into a twin-screw extruder and extruded and granulated at an extrusion temperature of 200°C. After cooling, it was granulated to obtain modified polyphenylene ether.
[0039] In this preparation example, the polyphenylene ether is graded PX1005X, the polypropylene is graded LG H430, and the ethylene-octene copolymer is graded Remat Plastics 3200.
[0040] Preparation Example 2 The only difference between this preparation example and Preparation Example 1 is that the modified polyphenylene ether is prepared using the following method: Polyphenylene ether, polypropylene, and ethylene-octene copolymer were added to a high-speed mixer at a mass ratio of 3:1:0.4 and mixed evenly to obtain a mixed elastomer. Antioxidant 1010 and antioxidant 168, accounting for 0.1% of the total mass of the mixed elastomer, were added to the elastomer and mixed evenly. The above mixture was fed into a twin-screw extruder and extruded and granulated at an extrusion temperature of 200°C. After cooling, it was granulated to obtain modified polyphenylene ether.
[0041] Preparation Example 3 The only difference between this preparation example and Preparation Example 1 is that the modified polyphenylene ether is prepared using the following method: Polyphenylene ether, polypropylene, and ethylene-octene copolymer were added to a high-speed mixer at a mass ratio of 5:1:1.5 and mixed evenly to obtain a mixed elastomer. Antioxidant 1010 and antioxidant 168, accounting for 0.1% of the total mass of the mixed elastomer, were added to the elastomer and mixed evenly. The above mixture was fed into a twin-screw extruder and extruded and granulated at an extrusion temperature of 200°C. After cooling, it was granulated to obtain modified polyphenylene ether.
[0042] Preparation Example 4 The only difference between this preparation example and Preparation Example 1 is that the modified polyphenylene ether is prepared using the following method: Polyphenylene ether, polypropylene, and ethylene-octene copolymer were added to a high-speed mixer at a mass ratio of 4:1:0.4 and mixed evenly to obtain a mixed elastomer. Antioxidant 1010 and antioxidant 168, accounting for 0.1% of the total mass of the mixed elastomer, were added to the elastomer and mixed evenly. The above mixture was fed into a twin-screw extruder and extruded and granulated at an extrusion temperature of 200°C. After cooling, it was granulated to obtain modified polyphenylene ether.
[0043] Preparation Example 5 The only difference between this preparation example and Preparation Example 1 is that the modified polyphenylene ether is prepared using the following method: Polyphenylene ether, polypropylene, and ethylene-octene copolymer were added to a high-speed mixer at a mass ratio of 4:1:1.5 and mixed evenly to obtain a mixed elastomer. Antioxidant 1010 and antioxidant 168, accounting for 0.1% of the total mass of the mixed elastomer, were added to the elastomer and mixed evenly. The above mixture was fed into a twin-screw extruder and extruded and granulated at an extrusion temperature of 200°C. After cooling, it was granulated to obtain modified polyphenylene ether.
[0044] Preparation Example 6 The only difference between this preparation example and Preparation Example 1 is that the modified polyphenylene ether is prepared using the following method: Polyphenylene ether and polypropylene are mixed evenly in a high-speed mixer at a mass ratio of 4:2 to obtain a mixed elastomer. Antioxidant 1010 and antioxidant 168, accounting for 0.1% of the total mass of the mixed elastomer, are added and mixed evenly. The mixture is then fed into a twin-screw extruder for extrusion granulation at an extrusion temperature of 200°C. After cooling, the mixture is pelletized to obtain modified polyphenylene ether.
[0045] Preparation Example 7 The only difference between this preparation example and Preparation Example 1 is that the modified polyphenylene ether is prepared using the following method: Polyphenylene ether and ethylene-octene copolymer were added to a high-speed mixer at a mass ratio of 4:2 and mixed evenly to obtain a mixed elastomer; antioxidant 1010 and antioxidant 168 were added to the mixed elastomer at a mass ratio of 0.1% and 0.5% respectively, and mixed evenly. The above mixture was fed into a twin-screw extruder and extruded and granulated at an extrusion temperature of 200°C. After cooling, it was granulated to obtain modified polyphenylene ether.
[0046] Preparation Example 8 This preparation example provides a modified micro-fine talc powder, prepared by the following method: 10 kg of fine talc powder was put into a high-speed mixer and heated to 100°C. Then 0.05 kg of titanate coupling agent was added and stirred at 400 r / min for 20 min. After cooling, modified fine talc powder was obtained.
[0047] In this preparation example, the particle size of the fine talc powder is 1250 mesh, and the titanate coupling agent is TC-WT.
[0048] Preparation Example 9 The only difference between this preparation example and preparation example 6 is that the particle size of the fine talc powder is 1000 mesh.
[0049] Preparation Example 10 The only difference between this preparation example and preparation example 6 is that the particle size of the fine talc powder is 1500 mesh.
[0050] Preparation Example 11 This preparation example provides a modified graphite, prepared by the following method: 10 kg of expandable graphite was put into a high-speed mixer, heated to 100°C, and then 1 kg of silane coupling agent was added. The mixture was stirred at 100 r / min for 20 min and cooled to obtain modified graphite.
[0051] In this preparation example, the expandable graphite has the product number Yuanshengrun 99100300, and the silane coupling agent is KH550. Example
[0052] Example 1 This embodiment discloses a flame-retardant running track granule, comprising the following components by weight: 3 kg hydrogenated styrene-butadiene block copolymer, 2.5 kg modified ethylene-octene copolymer, 4.5 kg modified polyphenylene ether, 2 kg modified fine talc powder, 4 kg nitrogen-phosphorus flame retardant, 1 kg modified graphite, 1 kg naphthenic oil, 0.1 kg silicone powder, 0.1 kg coupling agent, 0.1 kg antioxidant, 0.1 kg antioxidant, and 0.6 kg foaming agent.
[0053] In this embodiment, the hydrogenated styrene-butadiene block copolymer is of type Kronen G1645; the modified ethylene-octene copolymer is of type DuPont N416; the modified polyphenylene ether is prepared from Preparation Example 1; the modified fine talc powder is prepared from Preparation Example 8; the nitrogen-phosphorus flame retardant is of type Hongtaiji FR-601; the modified graphite is prepared from Preparation Example 11; the naphthenic oil is of type Xinjiang Karamay KN4010; the silicone powder is of type Kaijie Plastics KJ-B01; the coupling agent is silane coupling agent KH550; the antioxidant is T-531; the antioxidant is BASF 1010; and the foaming agent is supercritical carbon dioxide.
[0054] The preparation method of flame-retardant running track granules includes the following steps: The hydrogenated styrene-butadiene block copolymer, modified ethylene-octene copolymer, modified polyphenylene ether obtained in Preparation Example 1, and naphthenic oil were added to a stirring tank and stirred at 200 r / min for 20 min to obtain premix one. Mix the nitrogen and phosphorus flame retardant, antioxidant, and silicone powder in the specified amounts until uniform, then add the coupling agent and stir at 100 r / min for 20 min to obtain premix two. The premix I, premix II, modified fine talc powder prepared in Preparation Example 8, and modified graphite prepared in Preparation Example 11 were mixed and added into a mixing tank, heated to 80°C, and stirred at 200 r / min for 20 min to obtain a mixture. The mixture is fed into a two-stage extruder. After melt extrusion in the first-stage twin-screw extruder, it enters the second-stage single-screw extruder. The processing temperature range of the first-stage twin-screw extruder is 180-200℃, and the processing temperature of the second-stage single-screw extruder is 190℃. Supercritical carbon dioxide is injected into the second-stage single-screw extruder for physical foaming. The mixture is then extruded, stretched, cooled, and pelletized in the second-stage single-screw extruder to obtain flame-retardant racetrack pellets.
[0055] Example 2 The only difference between this embodiment and Example 1 is that the flame-retardant track particles include the following components by mass: 3 kg of hydrogenated styrene-butadiene block copolymer, 2.5 kg of modified ethylene-octene copolymer, 4.5 kg of modified polyphenylene ether, 1.5 kg of modified fine talc powder prepared in Preparation Example 8, 4.5 kg of nitrogen-phosphorus flame retardant, 0.8 kg of modified graphite prepared in Preparation Example 11, 1.5 kg of naphthenic oil, 0.05 kg of silicone powder, 0.05 kg of coupling agent, 0.2 kg of antioxidant, 0.05 kg of antioxidant, and 0.6 kg of foaming agent.
[0056] Example 3 The only difference between this embodiment and Example 1 is that the flame-retardant track particles include the following components by mass: 3 kg of hydrogenated styrene-butadiene block copolymer, 2.5 kg of modified ethylene-octene copolymer, 4.5 kg of modified polyphenylene ether, 1.5 kg of modified fine talc powder prepared in Preparation Example 8, 4.5 kg of nitrogen-phosphorus flame retardant, 0.8 kg of modified graphite prepared in Preparation Example 11, 1.5 kg of naphthenic oil, 0.05 kg of silicone powder, 0.05 kg of coupling agent, 0.2 kg of antioxidant, 0.05 kg of antioxidant, and 0.6 kg of foaming agent.
[0057] Example 4 The only difference between this embodiment and Example 1 is that the modified polyphenylene ether was prepared in Preparation Example 2.
[0058] Example 5 The only difference between this embodiment and Example 1 is that the modified polyphenylene ether was prepared by Preparation Example 3.
[0059] Example 6 The only difference between this embodiment and Example 1 is that the modified polyphenylene ether was prepared in Preparation Example 4.
[0060] Example 7 The only difference between this embodiment and Example 1 is that the modified polyphenylene ether was prepared by Example 5.
[0061] Example 8 The only difference between this embodiment and Example 1 is that the modified polyphenylene ether was prepared by Preparation Example 6.
[0062] Example 9 The only difference between this embodiment and Example 1 is that the modified polyphenylene ether was prepared in Preparation Example 7.
[0063] Example 10 The only difference between this embodiment and Embodiment 1 is that the rubber-plastic elastomer includes 5.5 kg of hydrogenated styrene-butadiene block copolymer, 2 kg of styrene-butadiene block copolymer, and 2.5 kg of polypropylene.
[0064] In this embodiment, the styrene-butadiene block copolymer is designated as Baling Petrochemical 792E; the polypropylene is designated as LG H430.
[0065] The preparation method of flame-retardant running track granules includes the following steps: Add the prescribed amounts of hydrogenated styrene-butadiene block copolymer, styrene-butadiene block copolymer, polypropylene, and naphthenic oil to a mixing tank and stir at 200 r / min for 20 min to obtain premix one; Mix the nitrogen and phosphorus flame retardant, antioxidant, and silicone powder in the specified amounts until uniform, then add the coupling agent and stir at 100 r / min for 20 min to obtain premix two. The premix I, premix II, modified fine talc powder prepared in Preparation Example 8, and modified graphite prepared in Preparation Example 11 were mixed and added into a mixing tank, heated to 80°C, and stirred at 200 r / min for 20 min to obtain a mixture. The mixture is fed into a two-stage extruder, extruded through a first-stage twin-screw extruder, and then fed into a second-stage single-screw extruder. Supercritical carbon dioxide is injected into the second-stage extruder for foaming treatment. After extrusion, stranding, cooling, and pelletizing, flame-retardant racetrack pellets are obtained.
[0066] Example 11 The only difference between this embodiment and Example 1 is that the modified micro-fine talc powder was prepared in Example 7.
[0067] Example 12 The only difference between this embodiment and Example 1 is that the modified micro-fine talc powder was prepared in Example 8.
[0068] Comparative Example Comparative Example 1 The only difference between this comparative example and Example 1 is that the runway particles comprise the following components by mass: 3 kg hydrogenated styrene-butadiene block copolymer, 2.5 kg modified ethylene-octene copolymer, 4.5 kg modified polyphenylene ether, 7 kg modified fine talc powder, 1 kg naphthenic oil, 0.1 kg silicone powder, 0.1 kg coupling agent, 0.1 kg antioxidant, 0.1 kg antioxidant, and 0.6 kg foaming agent.
[0069] The preparation method of runway granules includes the following steps: The hydrogenated styrene-butadiene block copolymer, modified ethylene-octene copolymer, modified polyphenylene ether obtained in Preparation Example 1, and naphthenic oil were added to a stirring tank and stirred at 200 r / min for 20 min to obtain premix one. Mix the antioxidant, anti-oxidant, and silicone powder in the specified amounts until uniform, then add the coupling agent and stir at 100 r / min for 20 min to obtain premix two. The amounts of premix 1, premix 2, and modified fine talc powder prepared in Preparation Example 8 were mixed and added into a mixing tank, heated to 80°C, and stirred at 200 r / min for 20 min to obtain a mixture. The mixture is fed into a two-stage extruder, extruded through a first-stage twin-screw extruder, and then fed into a second-stage single-screw extruder. Supercritical carbon dioxide is injected into the second-stage extruder for foaming treatment. After extrusion, stranding, cooling, and pelletizing, racetrack pellets are obtained.
[0070] Comparative Example 2 The only difference between this comparative example and Example 1 is that the runway particles include the following components by weight: 3 kg hydrogenated styrene-butadiene block copolymer, 2.5 kg modified ethylene-octene copolymer, 4.5 kg modified polyphenylene ether, 2 kg modified fine talc powder, 5 kg nitrogen-phosphorus flame retardant, 1 kg naphthenic oil, 0.1 kg silicone powder, 0.1 kg coupling agent, 0.1 kg antioxidant, 0.1 kg antioxidant, and 0.6 kg foaming agent.
[0071] The preparation method of runway granules includes the following steps: The hydrogenated styrene-butadiene block copolymer, modified ethylene-octene copolymer, modified polyphenylene ether obtained in Preparation Example 1, and naphthenic oil were added to a stirring tank and stirred at 200 r / min for 20 min to obtain premix one. Mix the nitrogen and phosphorus flame retardant, antioxidant, and silicone powder in the specified amounts until uniform, then add the coupling agent and stir at 100 r / min for 20 min to obtain premix two. The amounts of premix 1, premix 2, and modified fine talc powder prepared in Preparation Example 8 were mixed and added into a mixing tank, heated to 80°C, and stirred at 200 r / min for 20 min to obtain a mixture. The mixture is fed into a two-stage extruder, extruded through a first-stage twin-screw extruder, and then fed into a second-stage single-screw extruder. Supercritical carbon dioxide is injected into the second-stage extruder for foaming treatment. After extrusion, stranding, cooling, and pelletizing, racetrack pellets are obtained.
[0072] Comparative Example 3 The only difference between this comparative example and Example 1 is that the runway particles include the following components by mass: 3 kg hydrogenated styrene-butadiene block copolymer, 2.5 kg modified ethylene-octene copolymer, 4.5 kg modified polyphenylene ether, 2 kg modified fine talc powder, 4.8 kg nitrogen-phosphorus flame retardant, 0.2 kg modified graphite, 1 kg naphthenic oil, 0.1 kg silicone powder, 0.1 kg coupling agent, 0.1 kg antioxidant, 0.1 kg antioxidant, and 0.6 kg foaming agent.
[0073] Comparative Example 4 The only difference between this comparative example and Example 1 is that the runway particles include the following components by mass: 3 kg hydrogenated styrene-butadiene block copolymer, 2.5 kg modified ethylene-octene copolymer, 4.5 kg modified polyphenylene ether, 2 kg modified fine talc powder, 3 kg nitrogen-phosphorus flame retardant, 2 kg modified graphite, 1 kg naphthenic oil, 0.1 kg silicone powder, 0.1 kg coupling agent, 0.1 kg antioxidant, 0.1 kg antioxidant, and 0.6 kg foaming agent.
[0074] Comparative Example 5 The only difference between this comparative example and Example 1 is that the runway particles comprise the following components by mass: 3 kg hydrogenated styrene-butadiene block copolymer, 2.5 kg modified ethylene-octene copolymer, 4.5 kg modified polyphenylene ether, 2 kg modified fine talc powder, 5 kg modified graphite, 1 kg naphthenic oil, 0.1 kg silicone powder, 0.1 kg coupling agent, 0.1 kg antioxidant, 0.1 kg antioxidant, and 0.6 kg foaming agent.
[0075] The preparation method of runway granules includes the following steps: The hydrogenated styrene-butadiene block copolymer, modified ethylene-octene copolymer, modified polyphenylene ether obtained in Preparation Example 1, and naphthenic oil were added to a stirring tank and stirred at 200 r / min for 20 min to obtain premix one. Mix the antioxidant, anti-oxidant, and silicone powder in the specified amounts until uniform, then add the coupling agent and stir at 100 r / min for 20 min to obtain premix two. The premix I, premix II, modified fine talc powder prepared in Preparation Example 8, and modified graphite prepared in Preparation Example 11 were mixed and added into a mixing tank, heated to 80°C, and stirred at 200 r / min for 20 min to obtain a mixture. The mixture is fed into a two-stage extruder, extruded through a first-stage twin-screw extruder, and then fed into a second-stage single-screw extruder. Supercritical carbon dioxide is injected into the second-stage extruder for foaming treatment. After extrusion, stranding, cooling, and pelletizing, racetrack pellets are obtained.
[0076] Comparative Example 6 The difference between this comparative example and Example 1 is only that the runway particles include the following components by mass: 3 kg of hydrogenated styrene-butadiene block copolymer, 2.5 kg of modified ethylene-octene copolymer, 4.5 kg of modified polyphenylene ether, 4 kg of nitrogen-phosphorus based flame retardant, 3 kg of modified graphite prepared in Preparation Example 11, 1 kg of naphthenic oil, 0.1 kg of silicone powder, 0.1 kg of coupling agent, 0.1 kg of anti-aging agent, 0.1 kg of antioxidant, and 0.6 kg of foaming agent.
[0077] The preparation method of the runway particles includes the following steps: Add the formulated amounts of hydrogenated styrene-butadiene block copolymer, modified ethylene-octene copolymer, modified polyphenylene ether prepared in Preparation Example 1, and naphthenic oil into a stirring tank, and stir at a speed of 200 r / min for 20 min to obtain Premix 1; Mix the formulated amounts of nitrogen-phosphorus based flame retardant, anti-aging agent, antioxidant, and silicone powder evenly, then add the coupling agent thereto, and stir at a speed of 100 r / min for 20 min to obtain Premix 2; Put the formulated amounts of Premix 1, Premix 2, and modified graphite prepared in Preparation Example 11 into a stirring tank, heat to 80 °C, and stir at a speed of 200 r / min for 20 min to obtain a mixed material; Put the mixed material into a two-stage extruder, extrude it through a first-stage double-screw extruder and then enter a second-stage single-screw extruder, inject supercritical carbon dioxide into the second-stage extruder for foaming treatment, and then extrude, draw into strips, cool, and pelletize to obtain runway particles.
[0078] Comparative Example 7 The difference between this comparative example and Example 1 is only that the modified polyphenylene ether is replaced with an equal amount of polyphenylene ether.
[0079] Performance detection test According to the national standard GB 36246-2018 "Synthetic Material Surfaces for Sports Grounds in Primary and Secondary Schools", detect the harmful substance content, harmful substance release amount, physical properties, and odor grade of the runway particles prepared in each example and each comparative example, and summarize the test results in Table 1.
[0080] Refer to the national standard GB / T 8624-2012 "Classification of the Burning Behavior of Building Materials and Products" to detect the flame retardancy of the runway particles prepared in each example and each comparative example: According to the national standard GB / T 8626-2007 "Test Method for Flammability of Building Materials", detect the flame tip height within 20 s, and record the flame tip height less than 150 mm as qualified; According to the national standard GB / T 11785-2005 "Determination of the Burning Behavior of Floor Coverings - Radiant Heat Source Method", detect the critical heat flux CHF, and record CHF greater than 8.0 KW / m 2 as qualified; summarize the test results in Table 2.
[0081] Table 1 Table 2 As can be seen from Examples 1-3 and Example 10, and Tables 1 and 2, the flame-retardant running track granules prepared in this application meet the national standard GB / T 36246-2018 "Synthetic Material Surface Sports Fields for Primary and Secondary Schools". They have low content and release of harmful substances, good physical properties, no obvious strong unpleasant odor, and good performance and environmental protection. In addition, they have a high flame-retardant effect. According to GB / T 8626-2012 "Classification of Combustion Performance of Building Materials and Products", the combustion performance rating of the flame-retardant running track granules prepared in this application is B1 grade flame-retardant material, which has high safety.
[0082] Based on Examples 1, 4-9, and Comparative Example 7, and in conjunction with Tables 1 and 2, it can be seen that modifying polyphenylene ether with polypropylene and ethylene-octene copolymer can give flame-retardant running track particles better physical properties and flame retardancy. Furthermore, within the scope of this application, when the mass ratio of polyphenylene ether, polypropylene, and ethylene-octene copolymer is 4:1:1, the flame-retardant running track particles exhibit more balanced and superior overall performance.
[0083] Based on Examples 1 and Comparative Examples 1-6, and in conjunction with Tables 1 and 2, it can be seen that using a nitrogen-phosphorus flame retardant compounded with modified graphite as a flame retardant, and combining it with modified fine talc powder, can significantly improve the flame retardant performance of flame-retardant running track particles, further enhance the safety of use of flame-retardant running track particles, and reduce flammability.
[0084] As can be seen from Examples 1 and 11-12, and Tables 1 and 2, using fine talc powder with a particle size range of 1000-1500 mesh as raw material can give flame-retardant track particles better physical properties and higher flame retardancy.
[0085] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.
Claims
1. A flame-retardant running track granule, characterized in that, The components include the following parts by weight: 100 parts of rubber and plastic elastomer 15-30 parts of modified fine talc powder 35-45 parts of nitrogen-phosphorus flame retardant 8-12 parts of modified graphite 8-15 parts of naphthenic oil Silicone powder 0.5-2 parts 0.5-2 parts of coupling agent Anti-aging agent 0.5-2 parts, Antioxidant 0.5-2 parts 3-8 parts foaming agent.
2. The flame-retardant running track granules according to claim 1, characterized in that: The rubber-plastic elastomer is selected from one or a combination of several of hydrogenated styrene-butadiene block copolymers, styrene-butadiene block copolymers, polypropylene, modified ethylene-octene copolymers, and modified polyphenylene ethers.
3. The flame-retardant running track granules according to claim 2, characterized in that: The modified ethylene-octene copolymer is a maleic anhydride-grafted ethylene-octene copolymer.
4. The flame-retardant running track granules according to claim 2, characterized in that: The modification method of the modified polyphenylene ether includes: blending and modifying the polyphenylene ether with polypropylene and ethylene-octene copolymer; wherein the mass ratio of polyphenylene ether, polypropylene and ethylene-octene copolymer in the modified polyphenylene ether is (3-5):1:(0.4-1.5).
5. The flame-retardant running track granules according to claim 4, characterized in that: In the modified polyphenylene ether, the mass ratio of polyphenylene ether, polypropylene, and ethylene-octene copolymer is 4:1:
1.
6. The flame-retardant running track granules according to claim 1, characterized in that: The modified micro-fine talc powder is obtained by surface modification of micro-fine talc powder with a titanate coupling agent; the mass of the titanate coupling agent is 0.3%-0.8% of the mass of the micro-fine talc powder.
7. The flame-retardant running track granules according to claim 1, characterized in that: The modified graphite is obtained by surface modification of expanded graphite with a silane coupling agent; the mass of the silane coupling agent is 8-12% of the mass of the expanded graphite.
8. The flame-retardant running track granules according to claim 1, characterized in that: The foaming agent is supercritical carbon dioxide.
9. A method for preparing flame-retardant running track granules as described in any one of claims 1-8, characterized in that: Includes the following steps: Mix the formulated amounts of rubber and plastic elastomer and naphthenic oil, and stir to obtain premix one; Mix the nitrogen and phosphorus flame retardant, anti-aging agent, antioxidant, silicone powder and coupling agent in the prescribed amounts, and stir to obtain premix two; According to the formula, premix 1, premix 2, modified fine talc powder and modified graphite are mixed, heated and stirred to obtain a mixture; The mixture is fed into an extrusion device, a foaming agent of the specified amount is added, and then the mixture is extruded, stretched, cooled, and pelletized to obtain flame-retardant track granules.
10. The method for preparing flame-retardant running track granules according to claim 9, characterized in that: The extrusion step of the mixture specifically includes: feeding the mixture into a two-stage extruder, the two-stage extruder including a first-stage twin-screw extruder and a second-stage single-screw extruder; after the mixture is extruded by the first-stage twin-screw extruder, it enters the second-stage single-screw extruder, and a formulated amount of foaming agent is injected at the second-stage single-screw extruder; after extrusion, stretching, cooling, and pelletizing, flame-retardant racetrack pellets are obtained.