Antimony-free flame-retardant polyvinyl chloride cable material, preparation method thereof, and cable

Abstract

The present invention provides an antimony-free flame-retardant polyvinyl chloride cable material, a preparation method thereof, and a cable. The formula of the antimony-free flame-retardant polyvinyl chloride cable material comprises the following components, in parts by weight: 100 parts by weight of polyvinyl chloride, 30 to 80 parts by weight of a plasticizer, 0 to 50 parts by weight of calcium carbonate, 5 to 20 parts of a composite flame retardant, 4 to 8 parts of an environmentally friendly calcium-zinc composite stabilizer, and 0.5 to 2 parts of a lubricant; the composite flame retardant comprises hydroxide and glycerol zinc. The antimony-free flame-retardant polyvinyl chloride cable material provided by the present invention can maintain a flame retardant effect over a wide hardness range; in addition, the raw materials used in the preparation process of the present invention are environmentally friendly and non-toxic raw materials and can be 100% recycled and reused, which is conducive to improving production efficiency and reducing production costs.

Description

Technical Field

[0001] The invention belongs to the technical field of wires and cables, and relates to a polyvinyl chloride cable material, in particular to an antimony-free flame-retardant polyvinyl chloride cable material, a preparation method thereof, and a cable. Background Art

[0002] As the fire accident situation becomes increasingly serious, people's requirements for the fire-fighting and flame-retardant properties of materials are increasing day by day. Among them, wire and cable products are exposed to high-voltage and heating environments for a long time, so the fire-retardant properties of cable products are very important. Currently, the outer sheath materials of most cable products are polyvinyl chloride materials. The traditional flame retardant method is to add antimony trioxide as a flame retardant to achieve the flame retardant purpose. However, due to the toxicity of antimony compounds themselves, major environmental protection organizations have begun to restrict the antimony content in products. Because polyvinyl chloride cable products cannot add antimony trioxide, manufacturers have turned to conventional inorganic flame retardants such as magnesium hydroxide and aluminum hydroxide. However, the addition amount is large, usually more than 30%, which seriously affects the physical properties of the material. For example, the mechanical properties of the cable material will be greatly reduced.

[0003] Therefore, developing a polyvinyl chloride cable material that has both high-efficiency flame retardant properties and excellent mechanical properties and is safe and environmentally friendly has become one of the problems that need to be solved urgently in this field. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention provides an antimony-free flame-retardant polyvinyl chloride cable material, its preparation method, and its application. The antimony-free flame-retardant polyvinyl chloride cable material maintains its flame retardant effect over a wide hardness range. Furthermore, the raw materials used in the preparation process are environmentally friendly and non-toxic, and are 100% recyclable, thereby improving production efficiency and reducing production costs.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material comprises the following components in parts by weight:

[0007]

[0008] The composite flame retardant comprises hydroxide and glycerol zinc.

[0009] The antimony-free flame-retardant polyvinyl chloride cable material provided by this invention primarily addresses the technical problem of achieving high flame retardancy with a relatively low amount of flame retardant, ensuring the cable material possesses excellent mechanical properties. Furthermore, the raw materials used in the formulation of this antimony-free flame-retardant polyvinyl chloride cable material are environmentally friendly, non-toxic, and 100% recyclable, thereby improving production efficiency and reducing production costs.

[0010] The composite flame retardant of the present invention comprises hydroxide and glycerol zinc. During the combustion process, the hydroxide decomposes into oxides and water, wherein the water can dilute oxygen in the air and evaporate to remove heat. The metal oxide reacts with hydrogen chloride decomposed in polyvinyl chloride to generate chloride and water. In addition, zinc ions in the glycerol zinc react with hydroxyl groups generated by the decomposition of polyvinyl chloride to terminate further cracking, increase the carbonization rate, isolate oxygen and heat, and improve flame retardancy. The synergistic effect of the two can significantly improve flame retardancy. The content of the composite flame retardant is 5 to 20 parts by weight. Too high a content will lead to a decrease in physical properties, while too low a content will lead to insufficient flame retardancy.

[0011] Exemplarily, the formula of the antimony-free flame-retardant polyvinyl chloride cable material of the present invention comprises the following components in parts by weight: 100 parts of polyvinyl chloride; 30 to 80 parts of plasticizer, for example, 30 parts, 40 parts, 50 parts, 60 parts, 70 parts or 80 parts, but not limited to the listed values, and other values ​​not listed within the numerical range are also applicable; 0 to 50 parts of calcium carbonate, for example, 0 parts, 10 parts, 20 parts, 30 parts, 40 parts or 50 parts, but not limited to the listed values, and other values ​​not listed within the numerical range are also applicable. Use; composite flame retardant 5-20 parts, for example, it can be 5 parts, 10 parts, 15 parts or 20 parts, but not limited to the listed values, other values ​​not listed within the numerical range are also applicable; stabilizer 4-8 parts, for example, it can be 4 parts, 5 parts, 6 parts, 7 parts or 8 parts, but not limited to the listed values, other values ​​not listed within the numerical range are also applicable, lubricant 0.5-2 parts, for example, it can be 0.5 part, 1 part, 1.5 parts or 2 parts, but not limited to the listed values, other values ​​not listed within the numerical range are also applicable.

[0012] As a preferred technical solution of the present invention, the degree of polymerization of the polyvinyl chloride is 800 to 3000, for example, it can be 800, 1000, 1400, 1800, 2200, 2600 or 3000, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0013] Preferably, the plasticizer comprises any one of diisononyl phthalate, dioctyl terephthalate, trioctyl trimellitate, epoxy soybean oil or polyester plasticizer, or a combination of at least two thereof. Typical but non-limiting combinations include a combination of diisononyl phthalate, dioctyl terephthalate and trioctyl trimellitate, a combination of epoxy soybean oil and polyester plasticizer, a combination of diisononyl phthalate, dioctyl terephthalate, trioctyl trimellitate and polyester plasticizer, a combination of diisononyl phthalate, dioctyl terephthalate, trioctyl trimellitate and epoxy soybean oil, or a combination of diisononyl phthalate, dioctyl terephthalate, trioctyl trimellitate, epoxy soybean oil and polyester plasticizer.

[0014] Preferably, the particle size of the calcium carbonate is ≥2500 mesh, for example, it can be 2500 mesh, 2600 mesh, 2700 mesh, 2800 mesh, 2900 mesh or 3000 mesh, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0015] Preferably, the calcium carbonate includes heavy calcium carbonate and / or light calcium carbonate.

[0016] Preferably, the weight ratio of heavy calcium to light calcium is 5:1 to 1:3, for example, it can be 5:1, 5:2, 5:3, 5:4, 1:1, 1:2 or 1:3, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable; preferably it is 3:1 to 1:2, and more preferably it is 2:1 to 1:1.

[0017] Among them, the use of a mixture of heavy calcium and light calcium is more beneficial to the heat resistance and tensile strength of the cable material. If the addition ratio of heavy calcium is too high, it will have an adverse effect on the tensile strength of the cable material; if the addition ratio of light calcium is too high, it will have an adverse effect on the heat resistance of the cable material.

[0018] As a preferred technical solution of the present invention, the composite flame retardant includes hydroxide and glycerol zinc.

[0019] Preferably, the mass ratio of the hydroxide to the glycerol zinc is (5-30):1, for example, it can be 5:1, 8:1, 11:1, 14:1, 17:1, 20:1, 23:1, 27:1 or 30:1. When the mass ratio of the hydroxide to the glycerol zinc is within this range, the flame retardant effect is better; preferably, it is (8-24):1, and more preferably, it is (10-15):1.

[0020] Preferably, the particle size of the glycerol zinc is 800-5000 mesh, for example, 800 mesh, 1000 mesh, 1500 mesh, 2000 mesh, 3000 mesh, 4000 mesh or 5000 mesh, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0021] The glycerol zinc of the present invention is a white powder with a purity of ≥99%. The particle size of the glycerol zinc is 800-5000 mesh. The particle size within this range has good dispersibility, thus having a better flame retardant effect; if the particle size is too large or too small, its dispersibility is poor.

[0022] Preferably, the hydroxide comprises magnesium hydroxide and / or aluminum hydroxide.

[0023] As a preferred technical solution of the present invention, the stabilizer includes an environmentally friendly calcium-zinc composite stabilizer.

[0024] The stabilizer of the present invention can promote the plasticization of polyvinyl chloride resin.

[0025] Preferably, the lubricant includes any one of stearic acid, zinc stearate, calcium stearate, oxidized polyethylene wax or polyethylene wax, or a combination of at least two thereof. Typical but non-limiting combinations include a combination of stearic acid, zinc stearate and calcium stearate, a combination of oxidized polyethylene wax and polyethylene wax, a combination of stearic acid, zinc stearate, calcium stearate and oxidized polyethylene wax, or a combination of stearic acid, zinc stearate, calcium stearate, oxidized polyethylene wax and polyethylene wax.

[0026] In a second aspect, the present invention provides a method for preparing the antimony-free flame-retardant polyvinyl chloride cable material as provided in the first aspect, the preparation method comprising the following steps:

[0027] Polyvinyl chloride, plasticizer, calcium carbonate, composite flame retardant, stabilizer and lubricant are mixed according to the formula, and after mixing, they are successively subjected to banburying, extrusion and granulation to obtain the antimony-free flame retardant polyvinyl chloride cable material.

[0028] The preparation method of the present invention is simple and more conducive to industrial production.

[0029] As a preferred technical solution of the present invention, the mixing temperature is 130-150°C, for example, it can be 130°C, 135°C, 140°C, 145°C or 150°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0030] Preferably, the mixing time is 10 to 15 minutes, for example, 10 minutes, 11 minutes, 12 minutes, 13 minutes, 14 minutes or 15 minutes, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0031] It is worth noting that the mixing of the present invention is carried out using a high-speed stirrer.

[0032] As a preferred technical solution of the present invention, the mixing temperature is 145-160°C, for example, it can be 145°C, 148°C, 151°C, 154°C, 157°C or 160°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0033] Preferably, the extrusion is by single-screw extrusion.

[0034] Preferably, the temperature of the single-screw extrusion is 145-165°C, for example, 145°C, 150°C, 155°C, 160°C or 165°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0035] As a preferred technical solution of the present invention, the granulation further includes the steps of air cooling, screening and packaging.

[0036] As a preferred technical solution of the present invention, the preparation method of antimony-free flame-retardant polyvinyl chloride cable material provided in the second aspect of the present invention comprises the following steps:

[0037] (1) In a high-pressure mixing pot, polyvinyl chloride, plasticizer, calcium carbonate, composite flame retardant, stabilizer, and lubricant are mixed according to the formula, wherein the mixture is mixed for 10 to 15 minutes using a high-speed stirrer; the mixing temperature is 130 to 150° C.;

[0038] (2) kneading the mixture obtained in step (1) at 145-160° C., feeding the mixture into a single screw for extrusion, granulating, air-cooling, screening and packaging to obtain the antimony-free flame-retardant polyvinyl chloride cable material;

[0039] Wherein, the temperature of the single-screw extrusion is 145-165°C.

[0040] In a third aspect, the present invention provides a cable, wherein the raw materials for preparing the cable include the antimony-free flame-retardant polyvinyl chloride cable material provided in the first aspect.

[0041] The numerical range described in the present invention includes not only the point values ​​listed above, but also any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] (1) The antimony-free flame-retardant polyvinyl chloride cable material provided by the present invention can maintain a flame retardant effect within a wide hardness range;

[0044] (2) The raw materials of the antimony-free flame-retardant polyvinyl chloride cable material provided by the present invention are environmentally friendly and non-toxic raw materials, which can be 100% recycled and reused, which is beneficial to improving production efficiency and reducing production costs;

[0045] (3) The cable prepared using the antimony-free flame-retardant polyvinyl chloride cable material provided by the present invention has excellent mechanical properties. DETAILED DESCRIPTION

[0046] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0047] Example 1

[0048] This embodiment provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material includes the following components in parts by weight:

[0049] 100 parts by weight of polyvinyl chloride with a degree of polymerization of 1300, 30 parts by weight of plasticizer, 25 parts by weight of calcium carbonate, 5 parts by weight of composite flame retardant, 6 parts by weight of environmentally friendly calcium-zinc composite stabilizer, and 1 part by weight of lubricant.

[0050] Among them, the plasticizer is diisononyl phthalate and dioctyl terephthalate; the calcium carbonate is heavy calcium carbonate and light calcium carbonate in a mass ratio of 1:1; the lubricant is a mixture of stearic acid, zinc stearate and calcium stearate; the composite flame retardant is a mixture of hydroxide and glycerol zinc in a mass ratio of 12:1, and the hydroxide is a mixture of magnesium hydroxide and aluminum hydroxide in a mass ratio of 1:1; the particle size of the glycerol zinc is 800-2000 mesh.

[0051] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material comprises the following steps:

[0052] (1) In a high-pressure mixing pot, polyvinyl chloride, plasticizer, calcium carbonate, composite flame retardant, stabilizer, and lubricant are mixed according to the formula, and a high-speed stirrer is used to mix for 12 minutes to obtain a mixed material; the mixing temperature is 140° C.;

[0053] (2) kneading the mixture obtained in step (1) at 155° C., feeding the mixture into a single screw for extrusion, granulating, air-cooling, screening, and packaging to obtain the antimony-free flame-retardant polyvinyl chloride cable material;

[0054] Wherein, the temperature of the single-screw extrusion is 155°C.

[0055] Example 2

[0056] This embodiment provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material includes the following components in parts by weight:

[0057] 100 parts by weight of polyvinyl chloride with a degree of polymerization of 1300, 45 parts by weight of plasticizer, 25 parts by weight of calcium carbonate, 10 parts by weight of composite flame retardant, 6 parts by weight of environmentally friendly calcium-zinc composite stabilizer, and 1 part by weight of lubricant.

[0058] Among them, the plasticizer is diisononyl phthalate and dioctyl terephthalate; the calcium carbonate is heavy calcium carbonate and light calcium carbonate in a mass ratio of 1:1; the lubricant is oxidized polyethylene wax; the composite flame retardant is a mixture of hydroxide and glycerol zinc in a mass ratio of 10:1, and the hydroxide is a mixture of magnesium hydroxide and aluminum hydroxide in a mass ratio of 1:1; the particle size of the glycerol zinc is 1000-4000 mesh.

[0059] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0060] Example 3

[0061] This embodiment provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material includes the following components in parts by weight:

[0062] 100 parts by weight of polyvinyl chloride with a degree of polymerization of 1300, 65 parts by weight of plasticizer, 25 parts by weight of calcium carbonate, 15 parts by weight of composite flame retardant, 6 parts by weight of environmentally friendly calcium-zinc composite stabilizer, and 1 part by weight of lubricant.

[0063] Among them, the plasticizer is diisononyl phthalate and dioctyl terephthalate; the calcium carbonate is heavy calcium carbonate and light calcium carbonate in a mass ratio of 1:1; the lubricant is a mixture of stearic acid, zinc stearate and calcium stearate; the composite flame retardant is a mixture of hydroxide and glycerol zinc in a mass ratio of 12:1, and the hydroxide is a mixture of magnesium hydroxide and aluminum hydroxide in a mass ratio of 1:1; the particle size of the glycerol zinc is 3500-4500 mesh.

[0064] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0065] Example 4

[0066] This embodiment provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material includes the following components in parts by weight:

[0067] 100 parts by weight of polyvinyl chloride with a degree of polymerization of 1300, 80 parts by weight of plasticizer, 25 parts by weight of calcium carbonate, 20 parts by weight of composite flame retardant, 6 parts by weight of environmentally friendly calcium-zinc composite stabilizer, and 1 part by weight of lubricant.

[0068] Among them, the plasticizer is diisononyl phthalate and dioctyl terephthalate; the calcium carbonate is heavy calcium carbonate and light calcium carbonate in a mass ratio of 1:1; the lubricant is oxidized polyethylene wax; the composite flame retardant is a mixture of hydroxide and glycerol zinc in a mass ratio of 15:1, and the hydroxide is a mixture of magnesium hydroxide and aluminum hydroxide in a mass ratio of 1:1; the particle size of the glycerol zinc is 2000-3000 mesh.

[0069] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0070] Example 5

[0071] This embodiment provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material differs from that of Example 3 only in that:

[0072] In this embodiment, the mass ratio of hydroxide to glycerol zinc in the composite flame retardant is changed to 4:1.

[0073] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0074] Example 6

[0075] This embodiment provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material differs from that of Example 3 only in that:

[0076] In this embodiment, the mass ratio of hydroxide to glycerol zinc in the composite flame retardant is changed to 35:1.

[0077] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0078] Example 7

[0079] This embodiment provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material differs from that of Example 3 only in that:

[0080] In this embodiment, the hydroxide in the composite flame retardant is changed to aluminum hydroxide, that is, the composite flame retardant includes aluminum hydroxide and glycerol zinc.

[0081] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0082] Example 8

[0083] This embodiment provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material differs from that of Example 3 only in that:

[0084] In this embodiment, the hydroxide in the composite flame retardant is changed to magnesium hydroxide, that is, the composite flame retardant includes magnesium hydroxide and glycerol zinc.

[0085] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0086] Example 9

[0087] This embodiment provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material differs from that of Example 3 only in that:

[0088] In this embodiment, the particle size of glycerol zinc is modified to 300-750 mesh.

[0089] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0090] Example 10

[0091] This embodiment provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material differs from that of Example 3 only in that:

[0092] In this embodiment, the particle size of glycerol zinc is modified to 5050-6200 mesh.

[0093] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0094] Example 11

[0095] This embodiment provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material differs from that of Example 3 only in that:

[0096] In this embodiment, the mass ratio of hydroxide to glycerol zinc in the composite flame retardant is changed to 5:1.

[0097] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0098] Example 12

[0099] This embodiment provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material differs from that of Example 3 only in that:

[0100] In this embodiment, the mass ratio of hydroxide to glycerol zinc in the composite flame retardant is changed to 30:1.

[0101] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0102] Comparative Example 1

[0103] This comparative example provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material differs from that of Example 3 only in that:

[0104] In this embodiment, the weight proportion of the composite flame retardant is changed to 3 parts.

[0105] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0106] Comparative Example 2

[0107] This embodiment provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material differs from that of Example 3 only in that:

[0108] In this comparative example, the weight parts of the composite flame retardant are changed to 22 parts.

[0109] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0110] Comparative Example 3

[0111] This comparative example provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material differs from that of Example 3 only in that:

[0112] In this comparative example, the composite flame retardant is changed to 5 parts by weight of aluminum hydroxide, that is, glycerol zinc in the composite flame retardant is omitted.

[0113] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0114] Comparative Example 4

[0115] This comparative example provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material differs from that of Example 3 only in that:

[0116] The composite flame retardant was omitted in this comparative example.

[0117] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0118] Comparative Example 5

[0119] This comparative example provides an antimony-free flame-retardant polyvinyl chloride cable material. The formula of the antimony-free flame-retardant polyvinyl chloride cable material differs from that of Example 3 only in that:

[0120] In this comparative example, the composite flame retardant is changed to 20 parts by weight of aluminum hydroxide, and the weight of the plasticizer is changed to 80 parts.

[0121] The preparation method of the antimony-free flame-retardant polyvinyl chloride cable material is the same as that in Example 1.

[0122] Performance testing:

[0123] Cables were prepared using the antimony-free flame-retardant polyvinyl chloride cable materials provided in Examples 1-12 and Comparative Examples 1-5 as raw materials. The cables were subjected to tensile testing, hardness performance testing, and oxygen index performance testing. The results are shown in Table 1.

[0124] The tensile test standard is UL1581, the hardness test standard is ASTM2240; the oxygen index performance is tested in accordance with GB / T2406.2-2009 "Plastic Combustion Performance Test Method Oxygen Index Method".

[0125] Table 1

[0126]

[0127]

[0128] In summary, the antimony-free flame-retardant polyvinyl chloride cable material provided by the present invention can maintain a flame retardant effect within a wide hardness range; in addition, the raw materials used in the preparation process of the present invention are environmentally friendly and non-toxic raw materials and can be 100% recycled and reused, which is conducive to improving production efficiency and reducing production costs.

[0129] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An antimony-free flame-retardant polyvinyl chloride cable material, characterized in that: The formula of the antimony-free flame-retardant polyvinyl chloride cable material comprises the following components in parts by weight: The composite flame retardant includes aluminum hydroxide and glycerol zinc; or the composite flame retardant includes magnesium hydroxide, aluminum hydroxide and glycerol zinc; The particle size of the glycerol zinc is 800 to 5000 meshes.

2. The antimony-free flame-retardant polyvinyl chloride cable material according to claim 1, characterized in that: The polymerization degree of the polyvinyl chloride is 800-3000.

3. The antimony-free flame-retardant polyvinyl chloride cable material according to claim 1, characterized in that: The plasticizer includes any one of diisononyl phthalate, dioctyl terephthalate, trioctyl trimellitate, epoxy soybean oil or polyester plasticizer, or a combination of at least two of them.

4. The antimony-free flame-retardant polyvinyl chloride cable material according to claim 1, characterized in that: The particle size of the calcium carbonate is ≥2500 meshes.

5. The antimony-free flame-retardant polyvinyl chloride cable material according to claim 1, characterized in that: The calcium carbonate includes heavy calcium carbonate and / or light calcium carbonate.

6. The antimony-free flame-retardant polyvinyl chloride cable material according to claim 5, characterized in that: The weight ratio of the heavy calcium to the light calcium is 5:1 to 1:

3.

7. The antimony-free flame-retardant polyvinyl chloride cable material according to claim 6, characterized in that: The weight ratio of the heavy calcium to the light calcium is 3:1 to 1:

2.

8. The antimony-free flame-retardant polyvinyl chloride cable material according to claim 7, characterized in that: The weight ratio of the heavy calcium to the light calcium is 2:1 to 1:

1.

9. The antimony-free flame-retardant polyvinyl chloride cable material according to claim 1, characterized in that: In the composite flame retardant, the mass ratio of hydroxide to glycerol zinc is (5-30):

1.

10. The antimony-free flame-retardant polyvinyl chloride cable material according to claim 9, characterized in that: The mass ratio of the hydroxide to glycerol zinc is (8-24):

1.

11. The antimony-free flame-retardant polyvinyl chloride cable material according to claim 10, characterized in that: The mass ratio of the hydroxide to glycerol zinc is (10-15):

1.

12. The antimony-free flame-retardant polyvinyl chloride cable material according to claim 1, characterized in that: The stabilizer includes an environmentally friendly calcium-zinc composite stabilizer.

13. The antimony-free flame-retardant polyvinyl chloride cable material according to claim 1, characterized in that: The lubricant includes any one of stearic acid, zinc stearate, calcium stearate, oxidized polyethylene wax or polyethylene wax, or a combination of at least two thereof.

14. A method for preparing the antimony-free flame-retardant polyvinyl chloride cable material according to any one of claims 1 to 13, characterized in that: The preparation method comprises the following steps: Polyvinyl chloride, plasticizer, calcium carbonate, composite flame retardant, stabilizer and lubricant are mixed according to the formula, and after mixing, they are successively subjected to banburying, extrusion and granulation to obtain the antimony-free flame retardant polyvinyl chloride cable material.

15. The preparation method according to claim 14, characterized in that The mixing temperature is 130-150°C.

16. The preparation method according to claim 14, characterized in that The mixing time is 10 to 15 minutes.

17. The preparation method according to claim 14, characterized in that The temperature of the banburying is 145-160°C.

18. The preparation method according to claim 14, characterized in that The extrusion is performed by single-screw extrusion.

19. The preparation method according to claim 18, characterized in that The temperature of the single-screw extrusion is 145-165°C.

20. The preparation method according to claim 14, characterized in that The preparation method comprises the following steps: (1) In a high-pressure mixing pot, polyvinyl chloride, plasticizer, calcium carbonate, composite flame retardant, stabilizer, and lubricant are mixed according to the formula, wherein the mixture is mixed for 10 to 15 minutes using a high-speed stirrer; the mixing temperature is 130 to 150° C.; (2) kneading the mixture obtained in step (1) at 145-160° C., feeding the mixture into a single screw for extrusion, granulating, air-cooling, screening and packaging to obtain the antimony-free flame-retardant polyvinyl chloride cable material; Wherein, the temperature of the single-screw extrusion is 145-165°C.

21. A cable, characterized in that: The raw materials for preparing the cable include the antimony-free flame-retardant polyvinyl chloride cable material according to any one of claims 1 to 13.

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