Xlpo jacketing material and method of making same, jacket

Abstract

The application discloses an XLPO sheath material and a preparation method and a sheath thereof. The ingredients of the XLPO sheath material include the following components in parts by weight: EVA 35-55 parts, PE 5-10 parts, POE 10-15 parts, phosphate modified POSS flame retardant 5-30 parts, compatilizer 3-8 parts, and flame retardant 20-100 parts. The high-flame-retardant XLPO sheath material has excellent flame retardance and physical and mechanical properties.

Description

Technical Field

[0001] This invention relates to the field of sheathing materials, specifically to an XLPO sheathing material, its preparation method, and a sheathing. Background Technology

[0002] There are many types of XLPO cable materials that can meet UL's flame retardant requirements for low smoke and halogen-free flame retardant cables. Halogen-free high flame retardant cable materials are modified by adding a large amount of flame retardants such as aluminum hydroxide, aluminum diethylphosphite, and MCA. The addition of a large amount of flame retardants leads to a decrease in the physical properties of the material, which cannot meet the standard requirements. XLPO material has good flexibility, good insulation, lightweight structure, and low cost. It also has excellent crack resistance, low temperature resistance, wear resistance, and mechanical properties. It is widely used in shoe materials, pipes, injection molding, and cable materials. Therefore, it is essential to develop a high flame retardant and high-performance XLPO material. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention proposes an XLPO sheath material, its preparation method and sheath, aiming to solve the problem of poor flame retardancy and physical and mechanical properties of current XLPO materials.

[0004] To achieve the above objectives, the present invention proposes an XLPO sheath material, wherein the XLPO sheath material comprises, by weight, 35-55 parts of EVA, 5-10 parts of PE, 10-15 parts of POE, 5-30 parts of phosphate-modified POSS flame retardant, 3-8 parts of compatibilizer, and 20-100 parts of flame retardant.

[0005] Optionally, the PE includes one or more of low-density PE, medium-density PE, high-density PE, linear low-density PE, and metallocene PE; the POE is one or more of four-carbon POE or eight-carbon POE.

[0006] Optionally, the flame retardant includes 0-10 parts of P-series flame retardant, 0-20 parts of N-series flame retardant, and 20-60 parts of inorganic flame retardant.

[0007] Optionally, the XLPO sheath material further includes 0.2-1 parts lubricant, 0.5-2 parts antioxidant, and 0.2-1 parts light stabilizer; the lubricant is one or more of stearic acid, calcium stearate, magnesium stearate, polyethylene wax, paraffin wax, and silicone; the antioxidant includes at least one of antioxidant 1035, antioxidant 168, antioxidant TH-412S, antioxidant 1098, and antioxidant 1010; the light stabilizer includes one or more of zinc oxide, titanium dioxide, benzophenone, salicylic acid, and benzotriazole.

[0008] Optionally, the phosphate-modified POSS flame retardant is obtained by reacting glycidyl etheroxypropyl cage-like polysilsesquioxane, 2-aminoethyl-2,3-dihydroxypropyl-hydroxyphosphate, and a catalyst in an organic solution.

[0009] Optionally, the compatibilizer is one or more of PE grafted with maleic anhydride, POE grafted with maleic anhydride, PP grafted with maleic anhydride, and EMA grafted with maleic anhydride.

[0010] To achieve the above objectives, the present invention also proposes a method for preparing XLPO sheath material, comprising the following steps: obtaining phosphate-modified POSS flame retardant through catalytic reaction; mixing EVA, PE, POE, compatibilizer, phosphate-modified POSS flame retardant, flame retardant, and lubricant evenly, and then performing internal mixing, extrusion granulation to obtain granules; and drying the granules to obtain the XLPO sheath material.

[0011] Optionally, the catalytic reaction yields a phosphate-modified POSS flame retardant, comprising the following steps: dissolving glycidyl etheroxypropyl cage-like polysilsesquioxane in an organic solvent solution, adding 2-aminoethyl-2,3-dihydroxypropyl-hydroxyphosphate under the action of a catalyst, and then cleaning and drying after catalytic reaction to obtain the phosphate-modified POSS flame retardant.

[0012] Optionally, the catalyst comprises one or more organic acids and / or inorganic acids; and / or, the organic solvent comprises at least one of alcohols, aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, ethers, ketones, and diol derivatives.

[0013] To achieve the above objectives, the present invention also proposes a sheath for use in charging cables, comprising the sheath material described above.

[0014] The beneficial effects of this invention are as follows: In this invention, by using EVA, PE, POE, phosphate-modified POSS flame retardant and other flame retardants as the main components of XLPO sheath material, the components work together synergistically to maintain the good processing performance and elasticity of cross-linked polyolefins while improving the flame retardancy and physical and mechanical properties of XLPO sheath material. It also solves the problem of easy precipitation of phosphate ester. The phosphate-modified POSS is a colorless viscous liquid, and its addition to XLPO sheath material has little impact on the performance of XLPO sheath material. Moreover, a high addition amount is not required to obtain XLPO sheath material with excellent flame retardancy. Attached Figure Description

[0015] Figure 1 This is a molecular structure diagram of the phosphate ester modified POSS flame retardant of the present invention. Detailed Implementation

[0016] 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. It should be understood that the following embodiments are only used to explain the present invention and are not intended to limit the present invention.

[0017] Unless otherwise specified, all technical and scientific terms used herein have their usual meaning within the field to which the subject matter is claimed.

[0018] To facilitate understanding of this embodiment, the symbols, instruments, and terms are explained below:

[0019] XLPO: Cross-linked polyolefin, is an insulating material specifically used in photovoltaic cable insulation. One of its characteristics is that it is halogen-free and does not release toxic gases when exposed to fire. XLPO cables are flame-retardant and resistant to ultraviolet light, water, and ozone. They are also easy to peel and highly flexible. It is a type of polymeric synthetic material with excellent comprehensive properties.

[0020] EVA: Ethylene Vinyl Acetate Copolymer, is a copolymer of ethylene and vinyl acetate, widely used in foamed shoe materials, functional greenhouse films, packaging molds, hot melt adhesives, wires and cables, and toys.

[0021] PE: Polyethylene, is a thermoplastic resin obtained by polymerizing ethylene monomers. It is odorless, non-toxic, has a waxy feel, excellent low-temperature resistance, good chemical stability, can withstand the corrosion of most acids and alkalis, and has excellent electrical insulation properties.

[0022] POE: Polyolyaltha Olfin, is an elastic composite material. POE is a copolymer of ethylene and octene, in which the content of the comonomer octene is 20% to 30%.

[0023] Phosphorus-based flame retardants: Phosphorus-based flame retardants include inorganic phosphorus-based flame retardants and organic phosphorus-based flame retardants.

[0024] N-based flame retardants: Nitrogen-based flame retardants.

[0025] There are many types of XLPO cable materials that can meet UL's flame retardant requirements for low smoke and halogen-free flame retardant cables. Halogen-free high flame retardant cable materials are modified by adding a large amount of flame retardants such as aluminum hydroxide, aluminum diethylphosphite, and MCA. The addition of a large amount of flame retardants leads to a decrease in the physical properties of the material, which cannot meet the standard requirements. XLPO material has good flexibility, good insulation, lightweight structure, and low cost. It also has excellent crack resistance, low temperature resistance, wear resistance, and mechanical properties. It is widely used in shoe materials, pipes, injection molding, and cable materials. Therefore, it is essential to develop a high flame retardant and high-performance XLPO material.

[0026] To address the aforementioned problems, this invention proposes an XLPO sheathing material, wherein the XLPO sheathing material comprises, by weight, 35-55 parts EVA, 5-10 parts PE, 10-15 parts POE, 5-30 parts phosphate-modified POSS flame retardant, 3-8 parts compatibilizer, and 20-100 parts flame retardant.

[0027] In this scheme, EVA, PE, POE, phosphate-modified POSS flame retardant, and other flame retardants are used as the main components of XLPO sheath material. The components work together synergistically to maintain the good processing performance and elasticity of cross-linked polyolefins while improving the flame retardancy and physical and mechanical properties of XLPO sheath material. It also solves the problem of easy precipitation of phosphate ester. The phosphate-modified POSS is a colorless viscous liquid. Its addition to XLPO sheath material has little impact on the performance of XLPO sheath material, and a high addition amount is not required to obtain XLPO sheath material with excellent flame retardancy.

[0028] In some embodiments, the XLPO sheath material is preferably composed of the following components by weight: 35-55 parts EVA, 5-10 parts PE, 10-15 parts POE, 5-30 parts phosphate-modified POSS flame retardant, 3-8 parts compatibilizer, and 20-100 parts flame retardant.

[0029] Furthermore, the PE includes one or more of low-density PE, medium-density PE, high-density PE, linear low-density PE, and metallocene PE; the POE is one or more of four-carbon POE or eight-carbon POE.

[0030] In some embodiments, the PE includes low-density PE and medium-density PE.

[0031] In some embodiments, the POE comprises tetracarbon POE.

[0032] In some embodiments, the POE comprises an eight-carbon POE.

[0033] Furthermore, the flame retardant comprises 0-10 parts of P-series flame retardant, 0-20 parts of N-series flame retardant, and 20-60 parts of inorganic flame retardant.

[0034] The flame retardant mechanism of phosphorus-nitrogen synergistic flame retardant is a combination of condensed phase flame retardancy and gas phase flame retardancy. During the combustion heating process, the flame retardant decomposes to generate inorganic acids such as phosphoric acid and polyphosphoric acid, which can form a protective film on the surface of the substrate and isolate the air. At the same time, after being heated, it easily releases non-flammable gases such as ammonia, nitrogen, water vapor and nitrogen oxides. These gases block the supply of oxygen and achieve the purpose of flame retardancy.

[0035] Inorganic flame retardants add inorganic elements with inherent flame retardancy to the substrate in the form of elements or compounds. They are fully mixed with polymers in a physically dispersed state and play a flame retardant role in the gas phase or condensed phase through chemical or physical changes. In addition to flame retardant effect, they also inhibit smoke and hydrogen chloride generation in synthetic materials, and endow the materials with non-toxicity and non-corrosiveness.

[0036] In this solution, the flame retardant components form a halogen-free compound flame retardant, which allows multiple flame retardant elements to work synergistically, thereby better balancing the relationship between flame retardant dosage, performance and cost, making it more environmentally friendly and safer.

[0037] In some embodiments, the P-based flame retardant includes one or more of aluminum hypophosphite, calcium hypophosphite, diethyl aluminum hypophosphite (ADP), methyl ethyl aluminum hypophosphite, and phenyl aluminum hypophosphite, preferably diethyl aluminum hypophosphite (ADP).

[0038] In some embodiments, the N-series flame retardant includes one or more of melamine cyanurate (MCA), dicyandiamide, and melamine, preferably melamine cyanurate (MCA).

[0039] In some embodiments, the inorganic flame retardant includes one or more of magnesium hydroxide, aluminum hydroxide, and calcium carbonate, preferably aluminum hydroxide.

[0040] In some embodiments, the flame retardant comprises 10 parts of P-based flame retardant and 0 parts of N-based flame retardant.

[0041] In some embodiments, the flame retardant comprises 0 parts of P-based flame retardant and 10 parts of N-based flame retardant.

[0042] In some embodiments, the flame retardant comprises 5 parts of P-based flame retardant and 5 parts of N-based flame retardant.

[0043] In some embodiments, the flame retardant comprises 0 parts of P-based flame retardant, 0 parts of N-based flame retardant, and 20 parts of inorganic flame retardant.

[0044] Furthermore, the XLPO sheath material further includes 0.2-1 parts of lubricant, 0.5-2 parts of antioxidant, and 0.2-1 parts of light stabilizer; the lubricant is one or more of stearic acid, calcium stearate, magnesium stearate, polyethylene wax, paraffin wax, and silicone; the antioxidant includes at least one of antioxidant 1035, antioxidant 168, antioxidant TH-412S, antioxidant 1098, and antioxidant 1010; the light stabilizer includes one or more of zinc oxide, titanium dioxide, benzophenone, salicylic acid, and benzotriazole. Lubricants improve the compatibility and leveling properties of the mixed feed in the plasticized state during the mixing process, ensuring a uniform overall appearance and smooth surface of the sheath material. Antioxidants prevent thermal oxidative degradation of the elastomer, while anti-hydrolysis agents increase the polymer molecular weight and improve mechanical strength. Matting agents alter surface roughness and reduce surface gloss, while light stabilizers enhance the heat and light resistance of the sheath material, effectively preventing or delaying the photoaging process and thus extending its service life.

[0045] In some embodiments, the lubricant includes one or more combinations of stearic acid, calcium stearate, magnesium stearate, polyethylene wax, paraffin, and silicone, preferably silicone, and the XLPO sheath material is formulated with lubricant, preferably 0.5 parts.

[0046] In some embodiments, the antioxidant includes one or more of hindered phenolic antioxidants, hindered amine antioxidants, and phosphate ester antioxidants, preferably antioxidant 1010, and the XLPO sheath material contains an antioxidant, preferably 0.5 parts.

[0047] In some embodiments, the light stabilizer includes one or more of zinc oxide, titanium dioxide, benzophenone, salicylic acid, and benzotriazole, and the XLPO sheath material contains a light stabilizer, preferably 0.3 parts.

[0048] Furthermore, the phosphate-modified POSS flame retardant is obtained by reacting glycidyl etheroxypropyl cage-like polysilsesquioxane, 2-aminoethyl-2,3-dihydroxypropyl-hydroxyphosphate, and a catalyst in an organic solution. In this scheme, by reacting 2-aminoethyl-2,3-dihydroxypropyl-hydroxyphosphate molecules with glycidyl etheroxypropyl cage-like polysilsesquioxane, the phosphate ester is attached to the POSS molecule, thereby giving POSS not only excellent char-forming properties but also highly efficient flame retardancy, and solving the problem of phosphate esters easily precipitating due to their molecular weight.

[0049] Furthermore, the compatibilizer is one or more of the following: PE grafted with maleic anhydride, POE grafted with maleic anhydride, PP grafted with maleic anhydride, and EMA grafted with maleic anhydride. Appropriate compatibilizer content has a positive effect on the mechanical properties, molecular structure, and thermal properties of the TPS sheathing material.

[0050] In some embodiments, the compatibilizer is not specifically limited, but is preferably PP grafted with maleic anhydride, and the TPS sheath material includes 5 parts of compatibilizer.

[0051] To address the above problems, this invention also proposes a method for preparing XLPO sheathing material, comprising the following steps:

[0052] S1: Catalytic reaction yields phosphate-modified POSS flame retardant;

[0053] In this scheme, the obtained phosphate-modified POSS flame retardant can ensure the original good processing performance and elasticity of thermoplastic polyurethane elastomer, while improving the crack resistance of cable sheath material.

[0054] S2: EVA, PE, POE, compatibilizer, phosphate-modified POSS flame retardant, flame retardant and lubricant are mixed evenly, and then subjected to intensive mixing, extrusion and granulation to obtain granules; the granules are dried to obtain the XLPO sheath material.

[0055] In some embodiments, mixing is carried out in an internal mixer.

[0056] In some embodiments, antioxidants and light stabilizers are also added.

[0057] S3: The granular material is dried to obtain the XLPO sheath material.

[0058] In some embodiments, extrusion granulation is achieved using a twin-screw extruder.

[0059] In some embodiments, the length-to-diameter ratio of the twin-screw extruder is (35-40):1.

[0060] In some embodiments, the temperature at which the non-uniform particles are extruded and granulated to obtain XLPO preforms is 110°C-150°C.

[0061] In some embodiments, the temperature at which the granules are dried is 80°C-90°C.

[0062] Further, the catalytic reaction yields a phosphate-modified POSS flame retardant, comprising the following steps:

[0063] Glycidyl etheroxypropyl cage-like polysilsesquioxane was dissolved in an organic solvent solution, and 2-aminoethyl-2,3-dihydroxypropyl-hydroxyphosphate was added under the action of a catalyst. After catalytic reaction, the mixture was cleaned and dried to obtain phosphate-modified POSS flame retardant.

[0064] In some embodiments, the molar ratio of the glycidyl etheroxypropyl cage-like polysilsesquioxane and 2-aminoethyl-2,3-dihydroxypropyl-hydroxyphosphate ester for catalytic reaction is 1:8.

[0065] Furthermore, the catalyst comprises one or more organic acids and / or inorganic acids; and / or, the organic solvent comprises at least one of alcohols, aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, ethers, ketones, and diol derivatives.

[0066] In some embodiments, the catalyst is not specifically limited herein, but is preferably acetic acid.

[0067] In some embodiments, the organic solvent is not specifically limited herein, but is preferably tetrahydrofuran.

[0068] To address the aforementioned problems, the present invention also proposes a sheath for use in charging cables, comprising the aforementioned sheath material.

[0069] The following specific embodiments and data explain the content of the present invention.

[0070] Example 1:

[0071] 1 mol of glycidyl etheroxypropyl cage-like polysilsesquioxane was dissolved in 100 ml of tetrahydrofuran solution. 0.2 mol of acetic acid catalyst was added to the solution, and 8 mol of 2-aminoethyl-2,3-dihydroxypropyl-hydroxyphosphate was added under stirring. The reaction was stirred for 2-4 h, then stopped. The mixture was then rotary evaporated under reduced pressure, washed with water, and dried to obtain the phosphate-modified POSS flame retardant.

[0072] 50 parts EVA, 5 parts PE, 10 parts POE, 5 parts compatibilizer, 5 parts phosphate-modified POSS flame retardant, 50 parts flame retardant (0 parts ADP, 0 parts MCA, 50 parts aluminum hydroxide), 0.5 parts lubricant, 0.5 parts antioxidant, and 0.3 parts light stabilizer were mixed evenly, granulated by twin-screw extrusion at 130℃, and dried at 85℃ to obtain a high flame retardant and high performance XLPO sheath material.

[0073] Example 2:

[0074] The preparation method is the same as in Example 1, except that:

[0075] 50 parts EVA, 5 parts PE, 10 parts POE, 5 parts compatibilizer, 10 parts phosphate-modified POSS flame retardant, 50 parts flame retardant (0 parts ADP, 0 parts MCA, 50 parts aluminum hydroxide), 0.5 parts lubricant, 0.5 parts antioxidant, and 0.3 parts light stabilizer were mixed evenly, granulated by twin-screw extrusion at 130℃, and dried at 85℃ to obtain a high flame retardant and high performance XLPO sheath material.

[0076] Example 3:

[0077] The preparation method is the same as in Example 1, except that:

[0078] 50 parts EVA, 5 parts PE, 10 parts POE, 5 parts compatibilizer, 15 parts phosphate-modified POSS flame retardant, 50 parts flame retardant (0 parts ADP, 0 parts MCA, 50 parts aluminum hydroxide), 0.5 parts lubricant, 0.5 parts antioxidant, and 0.3 parts light stabilizer were mixed evenly, granulated by twin-screw extrusion at 130℃, and dried at 85℃ to obtain a high flame retardant and high performance XLPO sheath material.

[0079] Example 4:

[0080] The preparation method is the same as in Example 1, except that:

[0081] 50 parts EVA, 5 parts PE, 10 parts POE, 5 parts compatibilizer, 20 parts phosphate-modified POSS flame retardant, 50 parts flame retardant (0 parts ADP, 0 parts MCA, 50 parts aluminum hydroxide), 0.5 parts lubricant, 0.5 parts antioxidant, and 0.3 parts light stabilizer were mixed evenly, granulated by twin-screw extrusion at 130℃, and dried at 85℃ to obtain a high flame retardant and high performance XLPO sheath material.

[0082] Example 5:

[0083] The preparation method is the same as in Example 1, except that:

[0084] 50 parts EVA, 5 parts PE, 10 parts POE, 5 parts compatibilizer, 25 parts phosphate ester modified POSS flame retardant, 50 parts flame retardant (0 parts ADP, 0 parts MCA, 50 parts aluminum hydroxide), 0.5 parts lubricant, 0.5 parts antioxidant, and 0.3 parts light stabilizer were mixed evenly, granulated by twin-screw extrusion at 130℃, and dried at 85℃ to obtain a high flame retardant and high performance XLPO sheath material.

[0085] Example 6:

[0086] The preparation method is the same as in Example 1, except that:

[0087] 50 parts EVA, 5 parts PE, 10 parts POE, 5 parts compatibilizer, 30 parts phosphate-modified POSS flame retardant, 50 parts flame retardant (0 parts ADP, 0 parts MCA, 50 parts aluminum hydroxide), 0.5 parts lubricant, 0.5 parts antioxidant, and 0.3 parts light stabilizer were mixed evenly, granulated by twin-screw extrusion at 130℃, and dried at 85℃ to obtain a high flame retardant and high performance XLPO sheath material.

[0088] Example 7:

[0089] The preparation method is the same as in Example 1, except that:

[0090] 50 parts EVA, 5 parts PE, 10 parts POE, 5 parts compatibilizer, 20 parts phosphate-modified POSS flame retardant, 60 parts flame retardant (5 parts ADP, 5 parts MCA, 50 parts aluminum hydroxide), 0.5 parts lubricant, 0.5 parts antioxidant, and 0.3 parts light stabilizer were mixed evenly, granulated by twin-screw extrusion at 130℃, and dried at 85℃ to obtain a high flame retardant and high performance XLPO sheath material.

[0091] Comparative Example 1:

[0092] 50 parts EVA, 5 parts PE, 10 parts POE, 5 parts compatibilizer, 80 parts flame retardant (30 parts ADP, 0 parts MCA, 50 parts aluminum hydroxide), 0.5 parts lubricant, 0.5 parts antioxidant, and 0.3 parts light stabilizer are mixed evenly, granulated by twin-screw extrusion at 130℃, and dried at 85℃ to obtain a high flame retardant and high performance XLPO sheath material.

[0093] Comparative Example 2:

[0094] 50 parts EVA, 5 parts PE, 10 parts POE, 5 parts compatibilizer, 80 parts flame retardant (0 parts ADP, 30 parts MCA, 50 parts aluminum hydroxide), 0.5 parts lubricant, 0.5 parts antioxidant, and 0.3 parts light stabilizer are mixed evenly, granulated by twin-screw extrusion at 130℃, and dried at 85℃ to obtain a high flame retardant and high performance XLPO sheath material.

[0095] Comparative Example 3:

[0096] A high-flame-retardant, high-performance XLPO sheathing material was obtained by uniformly mixing 50 parts EVA, 5 parts PE, 10 parts POE, 5 parts compatibilizer, 30 parts 2-aminoethyl-2,3-dihydroxypropyl-hydroxyphosphate, 50 parts flame retardant (0 parts ADP, 0 parts MCA, 50 parts aluminum hydroxide), 0.5 parts lubricant, 0.5 parts antioxidant, and 0.3 parts light stabilizer, granulating the mixture by twin-screw extrusion at 130℃, and drying it at 85℃.

[0097] Comparative Example 4:

[0098] A high-flame-retardant, high-performance XLPO sheathing material was obtained by uniformly mixing 50 parts EVA, 5 parts PE, 10 parts POE, 5 parts compatibilizer, 30 parts glycidyl etheroxypropyl cage-like polysilsesquioxane, 50 parts flame retardant (0 parts ADP, 0 parts MCA, 50 parts aluminum hydroxide), 0.5 parts lubricant, 0.5 parts antioxidant, and 0.3 parts light stabilizer, granulating the mixture by twin-screw extrusion at 130℃, and drying it at 85℃.

[0099] The components and key preparation variables of Examples 1-7 and Comparative Examples 1-4 are summarized in Table 1.

[0100] Table 1. Components of Examples 1-7 and Comparative Examples 1-4 of the present invention

[0101]

[0102] According to the specifications of GB / T 1040.2, UL94 and GB / T 2406.2, the XLPO sheathing materials in Examples 1-7 and Comparative Examples 1-4 were tested for tensile strength, elongation at break, flame retardancy rating, oxygen index and exudation. The test results are recorded in Table 2 below:

[0103] Table 2. Performance of Examples 1-7 and Comparative Examples 1-4 of the present invention

[0104]

[0105] Based on the test results above, it can be seen that in Examples 1-6, the flame retardant performance gradually improves with the increase of the amount of phosphate-modified POSS flame retardant, proving that the phosphate-modified POSS flame retardant has good flame retardancy, high flame retardant efficiency, and resistance to exudation. Examples 6 and Comparative Example 4 show that the phosphate-modified POSS flame retardant has better flame retardancy; Examples 6 and Comparative Example 3 show that the phosphate-modified POSS flame retardant has good resistance to exudation; Example 7 shows that the phosphate-modified POSS flame retardant can also produce good results when used in combination with conventional flame retardants; Examples 6 and Comparative Example 1 show that the phosphate-modified POSS flame retardant has better compatibility, and the flame-retardant XLPO sheath material has superior physical properties; Examples 6 and Comparative Example 2 show that the phosphate-modified POSS flame retardant has better flame retardancy.

[0106] This invention verifies that by adding phosphate-modified POSS flame retardant, the flame retardancy of XLPO sheath material is improved, giving it excellent physical and mechanical properties, high industrial value, and the potential for widespread application and promotion.

[0107] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the patent protection scope of the present invention.

Claims

1. An XLPO sheathing material, characterized in that, The XLPO sheath material is formulated in parts by weight, comprising: EVA 35-55 parts, PE 5-10 parts, POE 10-15 copies, Phosphate ester modified POSS flame retardant, 5-30 parts, 3-8 parts compatibilizer Flame retardant 20-100 parts; The phosphate-modified POSS flame retardant is obtained by reacting glycidyl etheroxypropyl cage-like polysilsesquioxane, 2-aminoethyl-2,3-dihydroxypropyl-hydroxyphosphate, and a catalyst in an organic solution.

2. The XLPO sheath material as described in claim 1, characterized in that, The PE includes one or more of low-density PE, medium-density PE, high-density PE, linear low-density PE, and metallocene PE, and the POE is one or more of four-carbon POE or eight-carbon POE.

3. The XLPO sheathing material as described in claim 1, characterized in that, The flame retardant includes 0-10 parts of P-series flame retardant, 0-20 parts of N-series flame retardant, and 20-60 parts of inorganic flame retardant.

4. The XLPO sheath material as described in claim 1, characterized in that, The XLPO sheath material also includes 0.2-1 parts lubricant, 0.5-2 parts antioxidant, and 0.2-1 parts light stabilizer; the lubricant is one or more of stearic acid, calcium stearate, magnesium stearate, polyethylene wax, paraffin wax, and silicone; the antioxidant includes at least one of antioxidant 1035, antioxidant 168, antioxidant TH-412S, antioxidant 1098, and antioxidant 1010; the light stabilizer includes one or more of zinc oxide, titanium dioxide, benzophenone, salicylic acid, and benzotriazole.

5. The XLPO sheath material as described in claim 1, characterized in that, The compatibilizer is one or more of the following: PE grafted with maleic anhydride, POE grafted with maleic anhydride, PP grafted with maleic anhydride, and EMA grafted with maleic anhydride.

6. A method for preparing the XLPO sheath material as described in claim 4, characterized in that, Includes the following steps: A catalytic reaction yields a phosphate-modified POSS flame retardant; EVA, PE, POE, compatibilizer, phosphate-modified POSS flame retardant, flame retardant, lubricant, antioxidant and light stabilizer are mixed evenly, and then subjected to intensive mixing, extrusion and granulation to obtain granules; the granules are dried to obtain the XLPO sheath material.

7. The method for preparing the XLPO sheath material as described in claim 6, characterized in that, The catalytic reaction yields a phosphate-modified POSS flame retardant, comprising the following steps: Glycidyl etheroxypropyl cage-like polysilsesquioxane was dissolved in an organic solvent solution, and 2-aminoethyl-2,3-dihydroxypropyl-hydroxyphosphate was added under the action of a catalyst. After catalytic reaction, the mixture was cleaned and dried to obtain phosphate-modified POSS flame retardant.

8. The method for preparing the XLPO sheath material as described in claim 7, characterized in that, The catalyst includes one or more organic acids and / or inorganic acids; And / or, the organic solvent includes at least one of alcohols, aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, ethers, ketones, and diol derivatives.

9. A protective sleeve, characterized in that, Applied to charging cables, including the sheath material as described in any one of claims 1-5.

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