Low-smoke environment-friendly cable

Abstract

The invention relates to the technical field of cables, and provides a low-smoke environment-friendly cable which comprises a conductor and a protective layer which are sequentially arranged from inside to outside, and the protective layer is prepared from the following raw materials in parts by weight: 80 parts of polypropylene, 30-40 parts of hydrogenated petroleum resin, 10-20 parts of ethylene-vinyl acetate copolymer, 30-40 parts of ammonium polyphosphate and 30-60 parts of modified ammonium octamolybdate; the raw materials of the modified ammonium octamolybdate comprise polyhydroxyalkanoate and ammonium octamolybdate; the weight ratio of the polyhydroxyalkanoate to the ammonium octamolybdate is (1-5): 19. According to the technical scheme, the problems that a low-smoke environment-friendly cable protection layer in the prior art is low in tensile strength and relatively serious in smoke generation during combustion are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a low-smoke, environmentally friendly cable. Background Art

[0002] At present, wires and cables have been widely used in various industries. As environmental awareness has become more popular, the market has higher and higher requirements for the quality and performance of cables. In view of the increasing number of fires caused by cables, traditional cables will release a lot of smoke and toxic and corrosive gases when burning, and low-smoke environmentally friendly cables have become an important development direction for the cable industry. At present, the protective layer of existing low-smoke environmentally friendly cables still has the shortcomings of severe smoke and low tensile strength when burning, which limits the application of existing low-smoke environmentally friendly cables in certain special occasions. Therefore, in order to further broaden the use scenarios of low-smoke environmentally friendly cables, it is of great significance to develop a low-smoke environmentally friendly cable with high tensile strength of the protective layer and low smoke when burning. Summary of the invention

[0003] The present invention provides a low-smoke environmentally friendly cable, which solves the problems in the related art that the protective layer of the low-smoke environmentally friendly cable has low tensile strength and generates serious smoke during combustion.

[0004] The technical solution of the present invention is as follows: The present invention provides a low-smoke environmentally friendly cable, which comprises a conductor and a protective layer arranged in sequence from the inside to the outside, wherein the raw materials of the protective layer comprise the following components in parts by weight: 80 parts of polypropylene, 30-40 parts of hydrogenated petroleum resin, 10-20 parts of ethylene-vinyl acetate copolymer, 30-40 parts of ammonium polyphosphate, and 30-60 parts of modified ammonium octamolybdate; The raw materials of the modified ammonium octamolybdate include polyhydroxyalkanoate and ammonium octamolybdate; The weight ratio of the polyhydroxyalkanoate to ammonium octamolybdate is 1-5:19.

[0005] As a further technical solution, the preparation method of the modified ammonium octamolybdate comprises the following steps: dissolving polyhydroxyalkanoate in tetrahydrofuran, adding ammonium octamolybdate, dispersing evenly, and drying to obtain the modified ammonium octamolybdate.

[0006] As a further technical solution, the raw material of the modified ammonium octamolybdate also includes hydroxyacetamide.

[0007] In the present invention, the inventors found that when the raw material of modified ammonium octamolybdate also includes hydroxyacetamide, the tensile strength of the protective layer can be further improved and the problem of severe smoke generation during combustion can be improved. It is speculated that the addition of hydroxyacetamide can enhance the coating effect of polyhydroxyalkanoate on ammonium octamolybdate through chemical force, thereby further improving the dispersion effect of ammonium octamolybdate in the protective layer, and further improving the tensile strength of the protective layer and improving the problem of severe smoke generation during combustion.

[0008] As a further technical solution, the weight ratio of the hydroxyacetamide to ammonium octamolybdate is 0.5-1:19.

[0009] In the present invention, when the weight ratio of hydroxyacetamide to ammonium octamolybdate is 0.5-1:19, it is helpful to further improve the tensile strength of the protective layer and improve the problem of severe smoke generation during combustion.

[0010] As a further technical solution, the preparation method of the modified ammonium octamolybdate phosphate comprises the following steps: dissolving hydroxyacetamide and polyhydroxyalkanoate in tetrahydrofuran, adding ammonium octamolybdate, dispersing evenly, and drying to obtain the modified ammonium octamolybdate.

[0011] As a further technical solution, the conductor is a copper conductor or an aluminum conductor.

[0012] As a further technical solution, the raw material of the protective layer also includes 1 to 2 parts of antioxidants, and the antioxidants include one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076.

[0013] In the present invention, the addition of an antioxidant can effectively inhibit thermal oxidative aging and improve the stability of the protective layer during preparation. The antioxidant is preferably antioxidant 1010.

[0014] As a further technical solution, the raw material of the protective layer also includes 1 to 3 parts of lubricant, and the lubricant includes one or more of calcium stearate, silicone masterbatch, and microcrystalline wax.

[0015] In the present invention, the addition of lubricant can reduce the friction resistance in the process of preparing the protective layer and improve the preparation efficiency. The lubricant is preferably calcium stearate.

[0016] As a further technical solution, the raw material of the protective layer also includes 0.5 to 1 parts of ultraviolet absorber, and the ultraviolet absorber includes one or more of ultraviolet absorber UV-328, ultraviolet absorber UV-531, and ultraviolet absorber UV-9.

[0017] In the present invention, the addition of the ultraviolet absorber can improve the weather resistance of the protective layer and improve the product quality of the low-smoke and environmentally friendly cable as a whole. The ultraviolet absorber is preferably the ultraviolet absorber UV-328.

[0018] The present invention also proposes a method for preparing the low-smoke environmentally friendly cable, comprising the following steps: S1, mixing, extruding and granulating the raw materials of the protective layer to obtain protective layer particles; S2. Extruding the protective layer particles onto the surface of the conductor to obtain a low-smoke environmentally friendly cable.

[0019] As a further technical solution, in step S1, the temperature during extrusion is 100-150°C.

[0020] The working principle and beneficial effects of the present invention are: In the present invention, ammonium octamolybdate is modified by using polyhydroxyalkanoate, so that the dispersion ability of ammonium octamolybdate in the protective layer is improved, the agglomeration of ammonium octamolybdate in the protective layer is effectively avoided, and the adverse effects of agglomeration on the tensile strength of the protective layer and smoke generation during combustion are eliminated, thereby significantly improving the tensile strength of the protective layer and improving the problem of severe smoke generation during combustion. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the following embodiments and comparative examples, unless otherwise specified, the model of polypropylene is YPJ-1215C; the model of hydrogenated petroleum resin is XH-02; the model of ethylene-vinyl acetate copolymer is EVA-7A50H; the model of ammonium polyphosphate is HT-208; the model of polyhydroxyalkanoate is PHAPZ104; the antioxidant is antioxidant 1010; the lubricant is calcium stearate; the ultraviolet absorber is ultraviolet absorber UV-328; and the conductor is pure copper.

[0023] Example 1 A method for preparing a low-smoke environmentally friendly cable comprises the following steps: S1. By weight, 80 parts of polypropylene, 30 parts of hydrogenated petroleum resin, 10 parts of ethylene-vinyl acetate copolymer, 30 parts of ammonium polyphosphate, 30 parts of modified ammonium octamolybdate, 1 part of antioxidant, 1 part of lubricant, and 0.5 part of ultraviolet absorber are mixed, extruded, and granulated to obtain protective layer particles; Among them, during extrusion, the temperature of zone 1 is 100°C, the temperature of zone 2 is 150°C, and the temperature of zone 3 is 110°C; The preparation method of modified ammonium octamolybdate comprises the following steps: dissolving 6.25 parts of polyhydroxyalkanoate in 60 parts of tetrahydrofuran, adding 23.75 parts of ammonium octamolybdate, dispersing evenly, and drying to obtain modified ammonium octamolybdate; S2. Extruding protective layer particles onto the conductor surface to obtain a low-smoke, environmentally friendly cable.

[0024] Example 2 The only difference between this embodiment and embodiment 1 is that, in this embodiment, when preparing modified ammonium octamolybdate, the weight parts of polyhydroxyalkanoate are 1.5 parts, and the weight parts of ammonium octamolybdate are 28.5 parts.

[0025] Example 3 A method for preparing a low-smoke environmentally friendly cable comprises the following steps: S1. By weight, 80 parts of polypropylene, 40 parts of hydrogenated petroleum resin, 20 parts of ethylene-vinyl acetate copolymer, 40 parts of ammonium polyphosphate, 60 parts of modified ammonium octamolybdate, 2 parts of antioxidant, 3 parts of lubricant and 1 part of ultraviolet absorber are mixed, extruded and granulated to obtain protective layer particles; Among them, during extrusion, the temperature of zone 1 is 100°C, the temperature of zone 2 is 150°C, and the temperature of zone 3 is 110°C; The preparation method of modified ammonium octamolybdate comprises the following steps: dissolving 3 parts of polyhydroxyalkanoate in 120 parts of tetrahydrofuran, adding 57 parts of ammonium octamolybdate, dispersing evenly, and drying to obtain modified ammonium octamolybdate; S2. Extruding protective layer particles onto the conductor surface to obtain a low-smoke, environmentally friendly cable.

[0026] Example 4 The only difference between this embodiment and embodiment 3 is that in this embodiment, the preparation method of modified ammonium octamolybdate includes the following steps: dissolving 0.5 parts of hydroxyacetamide and 3 parts of polyhydroxyalkanoate in 120 parts of tetrahydrofuran, adding 57 parts of ammonium octamolybdate, dispersing evenly, and drying to obtain modified ammonium octamolybdate.

[0027] Example 5 The only difference between this embodiment and embodiment 4 is that, in this embodiment, when preparing modified ammonium octamolybdate, the weight portion of hydroxyacetamide is 4 parts.

[0028] Example 6 The only difference between this embodiment and embodiment 4 is that, in this embodiment, when preparing modified ammonium octamolybdate, the weight portion of hydroxyacetamide is 1.5 parts.

[0029] Example 7 The only difference between this embodiment and embodiment 4 is that, in this embodiment, when preparing modified ammonium octamolybdate, the weight portion of hydroxyacetamide is 3 parts.

[0030] Comparative Example 1 The only difference between this comparative example and Example 1 is that in this comparative example, the modified ammonium octamolybdate is replaced by an equal amount of ammonium octamolybdate.

[0031] Comparative Example 2 The only difference between this comparative example and Example 1 is that, in this comparative example, when preparing modified ammonium octamolybdate, the weight parts of polyhydroxyalkanoate are 8 parts and the weight parts of ammonium octamolybdate are 22 parts.

[0032] Comparative Example 3 The only difference between this comparative example and Example 1 is that, in this comparative example, when preparing modified ammonium octamolybdate, the weight portion of polyhydroxyalkanoate is 0.5 parts, and the weight portion of ammonium octamolybdate is 29.5 parts.

[0033] The following performance tests were performed on the low-smoke environmentally friendly cable protective layers prepared in Examples 1 to 7 and Comparative Examples 1 to 3: ① Tensile strength: refer to GB / T 1040.1-2018 "Determination of tensile properties of plastics Part 1: General" to test the tensile strength, where the test speed is 20mm / min, and the average of the results of 3 specimens in each group is taken as the final result, and the result is retained to one decimal place; ② Smoke density: Smoke density performance was measured in accordance with GB / T 8323.2-2008 "Plastic Smoke Generation Part 2: Single Chamber Test Method for Determining Smoke Density", where the test conditions were a radiation illumination of 25kW / m 2 , there is an ignition flame, and the smoke density performance is characterized by the average value of the minimum transmittance of 3 samples in each group. The larger the minimum transmittance, the better the smoke density performance.

[0034] The test results are shown in Table 1 below.

[0035] Table 1 Tensile strength and smoke density test results

[0036] Comparison between Example 1 and Comparative Example 1 shows that by modifying ammonium octamolybdate with polyhydroxyalkanoate, the tensile strength of the protective layer is significantly improved and the problem of severe smoke generation during combustion is improved. Comparison between Examples 1-2 and Comparative Examples 2-3 shows that the preferred weight ratio of polyhydroxyalkanoate to ammonium octamolybdate is 1-5:19.

[0037] Comparison between Example 3 and Examples 4 to 7 shows that when the raw material of the modified ammonium octamolybdate also includes hydroxyacetamide, the tensile strength of the protective layer can be further improved and the problem of severe smoke generation during combustion can be improved. Comparison between Examples 4 to 5 and Examples 6 to 7 shows that when the weight ratio of hydroxyacetamide to polyhydroxyalkanoate to ammonium octamolybdate is 0.5 to 1:19, it helps to further improve the tensile strength of the protective layer and improve the problem of severe smoke generation during combustion.

[0038] The above are only preferred 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 protection scope of the present invention.

Claims

1. A low-smoke environmentally friendly cable, comprising a conductor and a protective layer arranged in sequence from the inside to the outside, characterized in that: The raw materials of the protective layer include the following components in parts by weight: 80 parts of polypropylene, 30-40 parts of hydrogenated petroleum resin, 10-20 parts of ethylene-vinyl acetate copolymer, 30-40 parts of ammonium polyphosphate, and 30-60 parts of modified ammonium octamolybdate; The raw materials of the modified ammonium octamolybdate include polyhydroxyalkanoate and ammonium octamolybdate; The weight ratio of the polyhydroxyalkanoate to ammonium octamolybdate is 1-5:

19.

2. The low-smoke environmentally friendly cable according to claim 1, characterized in that: The preparation method of the modified ammonium octamolybdate comprises the following steps: dissolving polyhydroxyalkanoate in tetrahydrofuran, adding ammonium octamolybdate, dispersing evenly, and drying to obtain the modified ammonium octamolybdate.

3. The low-smoke environmentally friendly cable according to claim 1, characterized in that: The raw materials of the modified ammonium octamolybdate also include hydroxyacetamide.

4. The low-smoke environmentally friendly cable according to claim 3, characterized in that: The weight ratio of the hydroxyacetamide to ammonium octamolybdate is 0.5-1:

19.

5. The low-smoke environmentally friendly cable according to claim 3, characterized in that: The preparation method of the modified ammonium octamolybdate phosphate comprises the following steps: dissolving hydroxyacetamide and polyhydroxyalkanoate in tetrahydrofuran, adding ammonium octamolybdate, dispersing evenly, and drying to obtain the modified ammonium octamolybdate.

6. A low-smoke environmentally friendly cable according to any one of claims 1 to 5, characterized in that: The raw materials of the protective layer also include 1 to 2 parts of antioxidants, and the antioxidants include one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076.

7. A low-smoke environmentally friendly cable according to any one of claims 1 to 5, characterized in that: The raw materials of the protective layer also include 1 to 3 parts of lubricant, and the lubricant includes one or more of calcium stearate, silicone masterbatch, and microcrystalline wax.

8. A low-smoke environmentally friendly cable according to any one of claims 1 to 5, characterized in that: The raw material of the protective layer also includes 0.5 to 1 parts of ultraviolet absorber, and the ultraviolet absorber includes one or more of ultraviolet absorber UV-328, ultraviolet absorber UV-531, and ultraviolet absorber UV-9.

9. A method for preparing a low-smoke environmentally friendly cable according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, mixing, extruding and granulating the raw materials of the protective layer to obtain protective layer particles; S2. Extruding the protective layer particles onto the surface of the conductor to obtain a low-smoke environmentally friendly cable.

10. The method for preparing a low-smoke environmentally friendly cable according to claim 9, characterized in that: In step S1, the temperature during extrusion is 100-150°C.

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