High-strength blooming-free PVC cable material and preparation method thereof

Abstract

The invention provides a high-strength blooming-free PVC (polyvinyl chloride) cable material as well as a preparation method and application of the high-strength blooming-free PVC cable material. The environment-friendly bio-based plasticizer, the organic tin and rare earth composite heat stabilizer, the efficient compound antioxidant, the surface treatment modified nanofiller, the multifunctional processing aid, the phosphorus-nitrogen compound flame retardant and the cross-linking accelerant are matched in a specific proportion. The preparation method comprises the steps of raw material drying, mixing plasticizing, granulation forming and the like. The prepared cable material has the excellent properties of high strength, no blooming, low temperature resistance, high salt resistance and the like, is suitable for preparing various high-performance cables, is particularly applied to cables in a high-temperature-resistant and high-salt-resistant environment, and shows a wide application prospect.

Description

Technical Field

[0001] The invention belongs to the field of new materials and specifically discloses a high-strength frosting-free PVC cable material and a preparation method thereof. Background Art

[0002] In the wire and cable industry, PVC cable materials are widely used due to their good electrical properties, mechanical properties and processing properties. However, as the use environment becomes increasingly complex and diverse, the performance requirements for PVC cable materials are also getting higher and higher. Especially in some special environments, such as high temperature and high salt environments, traditional PVC cable materials often cannot meet the use requirements.

[0003] In the prior art, PVC cable materials are usually improved by adding various additives. However, the selection and proportioning of these additives are often not scientific and systematic, resulting in unstable performance of cable materials, prone to problems such as frost spraying and cracking. At the same time, the use of some additives may also cause environmental pollution, which is not in line with the current development trend of green environmental protection.

[0004] Specifically, the existing PVC cable materials have the following shortcomings: First, the choice of plasticizers is often not environmentally friendly and easily causes environmental pollution; second, the compounding effect of heat stabilizers and antioxidants is not good, resulting in the performance of cable materials being degraded under high temperature or oxidizing environments; third, the selection and modification of fillers are not scientific enough, making it difficult to effectively improve the mechanical strength and wear resistance of cable materials; fourth, the addition of flame retardants often affects the processing performance and electrical properties of cable materials; fifth, the use of cross-linking promoters is not precise enough, which easily affects the cross-linking effect and final performance of cable materials. Summary of the invention

[0005] To solve the above problems, we disclose a high-strength, frosting-free PVC cable material and a preparation method thereof. The PVC cable material has the characteristics of high strength, frosting-free, high temperature and salt resistance, and environmental protection.

[0006] The present invention includes the following specific technical solutions:

[0007] A high-strength, frost-free PVC cable material, calculated by weight, is made of the following raw materials:

[0008]

[0009]

[0010] The plasticizer is an environmentally friendly bio-based plasticizer;

[0011] The heat stabilizer is a combination of an organic tin stabilizer and a rare earth stabilizer;

[0012] The antioxidant is compounded by a high-efficiency hindered phenol antioxidant and a phosphite antioxidant;

[0013] The modified nano filler is a mixture of surface-treated nano silicon dioxide and nano calcium carbonate;

[0014] The processing aids include but are not limited to lubricants, dispersants and leveling agents;

[0015] The flame retardant is a compound of a phosphorus-based flame retardant and a nitrogen-based flame retardant.

[0016] Furthermore, in the above-mentioned high-strength bloom-free PVC cable material, the plasticizer is epoxy fatty acid methyl ester.

[0017] Furthermore, in the above-mentioned high-strength bloom-free PVC cable material, the heat stabilizer is obtained by compounding dibutyltin dilaurate and lanthanum stearate in a mass ratio of 2.5:1.

[0018] Furthermore, in the above-mentioned high-strength bloom-free PVC cable material, the antioxidant is a compound of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2.

[0019] Furthermore, in the above-mentioned high-strength non-blooming PVC cable material, the modified nano filler is obtained by compounding Evonik's silica AEROSIL R 816 and nano calcium carbonate in a mass ratio of 3:1.

[0020] Furthermore, in the above-mentioned high-strength bloom-free PVC cable material, the processing aid is composed of Runkelian lubricant WE40, dispersant TEGO Dispers 757W, and Deqian 875 leveling agent in a mass ratio of 1:2:2.

[0021] Furthermore, in the above-mentioned high-strength bloom-free PVC cable material, the flame retardant is composed of the phosphorus-based flame retardant Clariant OP935 and the HT-211MCA melamine cyanurate nitrogen-based flame retardant in a mass ratio of 2:1.

[0022] Furthermore, in the above-mentioned high-strength bloom-free PVC cable material, the cross-linking accelerator is Shin-Etsu KBM-503.

[0023] The present invention also discloses a method for preparing the high-strength non-blooming PVC cable material, which comprises the following steps: 1) drying: performing low-temperature drying treatment on all raw materials according to the formula amount before feeding;

[0024] 2) Mixing and plasticizing: At room temperature, in a high-speed mixer, pre-mix the polyvinyl chloride resin, plasticizer, heat stabilizer, antioxidant and processing aid to ensure that the components are evenly dispersed; then, add the modified nanofiller and flame retardant and continue mixing until uniform; finally, increase the mixer temperature to 40-60°C, add the cross-linking accelerator, and stir for 20-40 minutes to promote the plasticization of the resin and further fusion of the components;

[0025] 3) Granulation and molding:

[0026] The mixed materials are granulated through a twin-screw extruder at an extrusion temperature of 110-130°C to achieve uniform particle size and regular shape; the granulated cable material is dried at room temperature to remove residual volatiles;

[0027] According to the specifications and requirements of the cable, the dried cable material is molded by an injection molding machine to produce the required cable products.

[0028] The invention also discloses application of the cable material in preparing low temperature and high salt resistance cables.

[0029] Compared with the prior art, the present invention has the following outstanding beneficial effects:

[0030] The high-strength, frosting-free PVC cable material provided by the present invention, as well as its preparation method and application, have significant beneficial effects. First, by selecting environmentally friendly bio-based plasticizers, not only the flexibility and processing performance of the cable material are effectively improved, but also the pollution to the environment is significantly reduced, which is in line with the development trend of green environmental protection. Secondly, the combination of organic tin stabilizer and rare earth stabilizer, as well as the compounding of high-efficiency hindered phenol antioxidant and phosphite antioxidant, significantly improves the thermal stability and antioxidant performance of the cable material, so that it can still maintain excellent performance under high temperature or oxidative environment.

[0031] In addition, the present invention also uses a scientific ratio and modification process to mix nano silicon dioxide and nano calcium carbonate as modified nano fillers, effectively improving the mechanical strength and wear resistance of the cable material. At the same time, the compound use of phosphorus flame retardants and nitrogen flame retardants not only ensures the flame retardant properties of the cable material, but also avoids the adverse effects of traditional flame retardants on processing properties and electrical properties.

[0032] Finally, the preparation method of the present invention is simple and efficient. Through precise raw material ratio and scientific processing technology, the uniform dispersion and full integration of the components of the cable material are ensured, thereby obtaining high-strength, frosting-free, high-temperature and high-salt resistant high-quality cable material. The cable material has a wide range of application prospects in the preparation of high-temperature and high-salt resistant cables, providing strong technical support for the development of the wire and cable industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Comparison chart of cable material performance test at room temperature;

[0034] Figure 2 Comparison chart of cable material performance tests under high temperature. DETAILED DESCRIPTION

[0035] A high-strength, frost-free PVC cable material, calculated by weight, is made of the following raw materials:

[0036]

[0037] The plasticizer is epoxy fatty acid methyl ester;

[0038] The heat stabilizer is prepared by mixing dibutyltin dilaurate and lanthanum stearate in a mass ratio of 2.5:1;

[0039] The antioxidant is prepared by mixing antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2;

[0040] The modified nanofiller is prepared by compounding Evonik silica AEROSIL R 816 and nano calcium carbonate in a mass ratio of 3:1;

[0041] The processing aid is composed of Runkelian lubricant WE40, dispersant TEGO Dispers 757W, and Deqian 875 leveling agent in a mass ratio of 1:2:2;

[0042] The flame retardant is composed of a phosphorus-based flame retardant Clariant OP935 and a melamine cyanurate nitrogen-based flame retardant HT-211MCA at a mass ratio of 2:1;

[0043] The cross-linking accelerator is Shin-Etsu KBM-503;

[0044] The method for preparing the high-strength non-blooming PVC cable material is characterized by comprising the following steps:

[0045] 1) Drying: All raw materials are dried at low temperature before feeding according to the formula;

[0046] 2) Mixing and plasticizing: At room temperature, in a high-speed mixer, pre-mix the polyvinyl chloride resin, plasticizer, heat stabilizer, antioxidant and processing aid to ensure that the components are evenly dispersed; then, add the modified nanofiller and flame retardant and continue mixing until uniform; finally, increase the mixer temperature to 40-60°C, add the cross-linking accelerator, and stir for 20-40 minutes to promote the plasticization of the resin and further fusion of the components;

[0047] 3) Granulation and molding:

[0048] The mixed materials are granulated through a twin-screw extruder at an extrusion temperature of 110-130°C to achieve uniform particle size and regular shape; the granulated cable material is dried at room temperature to remove residual volatiles;

[0049] According to the specifications and requirements of the cable, the dried cable material is molded by an injection molding machine to produce the required cable products.

[0050] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0051] Example 1

[0052] A high-strength, frost-free PVC cable material, calculated by weight, is made of the following raw materials:

[0053]

[0054] The plasticizer is epoxy fatty acid methyl ester;

[0055] The heat stabilizer is prepared by mixing dibutyltin dilaurate and lanthanum stearate in a mass ratio of 2.5:1;

[0056] The antioxidant is prepared by mixing antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2;

[0057] The modified nanofiller is prepared by compounding Evonik silica AEROSIL R 816 and nano calcium carbonate in a mass ratio of 3:1;

[0058] The processing aid is composed of Runkelian lubricant WE40, dispersant TEGO Dispers 757W, and Deqian 875 leveling agent in a mass ratio of 1:2:2;

[0059] The flame retardant is composed of a phosphorus-based flame retardant Clariant OP935 and a melamine cyanurate nitrogen-based flame retardant HT-211MCA at a mass ratio of 2:1;

[0060] The cross-linking accelerator is Shin-Etsu KBM-503;

[0061] The method for preparing the high-strength non-blooming PVC cable material is characterized by comprising the following steps:

[0062] 1) Drying: All raw materials are dried at low temperature before feeding according to the formula;

[0063] 2) Mixing and plasticizing: At room temperature, in a high-speed mixer, pre-mix the polyvinyl chloride resin, plasticizer, heat stabilizer, antioxidant and processing aid to ensure that the components are evenly dispersed; then, add the modified nanofiller and flame retardant and continue mixing until uniform; finally, increase the mixer temperature to 40-60°C, add the cross-linking accelerator, and stir for 20-40 minutes to promote the plasticization of the resin and further fusion of the components;

[0064] 3) Granulation and molding:

[0065] The mixed materials are granulated through a twin-screw extruder at an extrusion temperature of 110-130°C to achieve uniform particle size and regular shape; the granulated cable material is dried at room temperature to remove residual volatiles;

[0066] According to the specifications and requirements of the cable, the dried cable material is molded by an injection molding machine to produce the required cable products.

[0067] Example 2

[0068] A high-strength, frost-free PVC cable material, calculated by weight, is made of the following raw materials:

[0069]

[0070] The plasticizer is epoxy fatty acid methyl ester;

[0071] The heat stabilizer is prepared by mixing dibutyltin dilaurate and lanthanum stearate in a mass ratio of 2.5:1;

[0072] The antioxidant is prepared by mixing antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2;

[0073] The modified nanofiller is prepared by compounding Evonik silica AEROSIL R 816 and nano calcium carbonate in a mass ratio of 3:1;

[0074] The processing aid is composed of Runkelian lubricant WE40, dispersant TEGO Dispers 757W, and Deqian 875 leveling agent in a mass ratio of 1:2:2;

[0075] The flame retardant is composed of a phosphorus-based flame retardant Clariant OP935 and a melamine cyanurate nitrogen-based flame retardant HT-211MCA at a mass ratio of 2:1;

[0076] The cross-linking accelerator is Shin-Etsu KBM-503;

[0077] The method for preparing the high-strength non-blooming PVC cable material is characterized by comprising the following steps:

[0078] 1) Drying: All raw materials are dried at low temperature before feeding according to the formula;

[0079] 2) Mixing and plasticizing: At room temperature, in a high-speed mixer, pre-mix the polyvinyl chloride resin, plasticizer, heat stabilizer, antioxidant and processing aid to ensure that the components are evenly dispersed; then, add the modified nanofiller and flame retardant and continue mixing until uniform; finally, increase the mixer temperature to 40-60°C, add the cross-linking accelerator, and stir for 20-40 minutes to promote the plasticization of the resin and further fusion of the components;

[0080] 3) Granulation and molding:

[0081] The mixed materials are granulated through a twin-screw extruder at an extrusion temperature of 110-130°C to achieve uniform particle size and regular shape; the granulated cable material is dried at room temperature to remove residual volatiles;

[0082] According to the specifications and requirements of the cable, the dried cable material is molded by an injection molding machine to produce the required cable products.

[0083] Example 3

[0084] A high-strength, frost-free PVC cable material, calculated by weight, is made of the following raw materials:

[0085]

[0086] The plasticizer is epoxy fatty acid methyl ester;

[0087] The heat stabilizer is prepared by mixing dibutyltin dilaurate and lanthanum stearate in a mass ratio of 2.5:1;

[0088] The antioxidant is prepared by mixing antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2;

[0089] The modified nanofiller is prepared by compounding Evonik silica AEROSIL R 816 and nano calcium carbonate in a mass ratio of 3:1;

[0090] The processing aid is composed of Runkelian lubricant WE40, dispersant TEGO Dispers 757W, and Deqian 875 leveling agent in a mass ratio of 1:2:2;

[0091] The flame retardant is composed of a phosphorus-based flame retardant Clariant OP935 and a melamine cyanurate nitrogen-based flame retardant HT-211MCA at a mass ratio of 2:1;

[0092] The cross-linking accelerator is Shin-Etsu KBM-503;

[0093] The method for preparing the high-strength non-blooming PVC cable material is characterized by comprising the following steps:

[0094] 1) Drying: All raw materials are dried at low temperature before feeding according to the formula;

[0095] 2) Mixing and plasticizing: At room temperature, in a high-speed mixer, pre-mix the polyvinyl chloride resin, plasticizer, heat stabilizer, antioxidant and processing aid to ensure that the components are evenly dispersed; then, add the modified nanofiller and flame retardant and continue mixing until uniform; finally, increase the mixer temperature to 40-60°C, add the cross-linking accelerator, and stir for 20-40 minutes to promote the plasticization of the resin and further fusion of the components;

[0096] 3) Granulation and molding:

[0097] The mixed materials are granulated through a twin-screw extruder at an extrusion temperature of 110-130°C to achieve uniform particle size and regular shape; the granulated cable material is dried at room temperature to remove residual volatiles;

[0098] According to the specifications and requirements of the cable, the dried cable material is molded by an injection molding machine to produce the required cable products.

[0099] Comparative Example 1

[0100] This comparative example does not contain modified nanofiller, and the rest is the same as Example 2.

[0101] Comparative Example 2

[0102] The heat stabilizer used in this comparative example is only dibutyltin dilaurate, and the rest is the same as in Example 2.

[0103] Comparative Example 3

[0104] The flame retardant used in this comparative example is only the phosphorus-based flame retardant Clariant OP935, and the rest is the same as in Example 2.

[0105] Comparative Example 4

[0106] Commercially available conventional cable materials.

[0107] Test Case

[0108] The cable materials of Examples 1-3 and Comparative Examples 1-3 were used to prepare cables with a length of 10 cm and a diameter of 1 cm, and performance tests were performed, including tensile strength and elongation at break at room temperature; tensile strength and elongation at break after high temperature (80°C) treatment for 168 hours, and surface frost observation; and salt spray test (GB / T 2423.17-2008 "Basic Environmental Test Procedures for Electrical and Electronic Products Test Ka: Salt Spray Test Method"), 5% sodium chloride concentration, 60°C, 100 hours, to observe surface corrosion.

[0109] The results are shown in Table 1 and Figure 1 and 2 shown.

[0110] Table 1: Performance Test

[0111]

[0112] From the results in Table 1 above, it can be seen that Examples 1-3 of the present invention have excellent mechanical properties at room temperature and high temperature, no blooming on the surface after high temperature accelerated test, and strong corrosion resistance; from the comparison between Example 2 and Comparative Examples 1-3, it can be seen that after adding the modified nanomaterial, the mechanical properties at room temperature and high temperature are greatly improved, and the blooming can be greatly reduced, and its corrosion resistance is improved. When the heat stabilizer is compounded with dibutyltin dilaurate and lanthanum stearate in a mass ratio of 2.5:1, its mechanical properties at high temperature can be improved.

[0113] It can be seen from the above examples that the preparation method of the present invention is simple and efficient. Through precise raw material ratios and scientific processing technology, the uniform dispersion and full fusion of the components of the cable material are ensured, thereby obtaining a high-strength, frosting-free, high-temperature and high-salt resistant high-quality cable material. The cable material has a wide range of application prospects in the preparation of high-temperature and high-salt resistant cables, and provides strong technical support for the development of the wire and cable industry.

[0114] The above are only a few preferred embodiments of the present invention, which are described in a more specific and detailed manner, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A high-strength, non-frost-spraying PVC cable material, characterized in that: Calculated by weight, it is made from the following raw materials: The plasticizer is an environmentally friendly bio-based plasticizer; The heat stabilizer is a combination of an organic tin stabilizer and a rare earth stabilizer; The antioxidant is compounded by a high-efficiency hindered phenol antioxidant and a phosphite antioxidant; The modified nano filler is a mixture of surface-treated nano silicon dioxide and nano calcium carbonate; The processing aids include but are not limited to lubricants, dispersants and leveling agents; The flame retardant is a compound of a phosphorus-based flame retardant and a nitrogen-based flame retardant.

2. A high-strength, bloom-free PVC cable material according to claim 1, characterized in that: The plasticizer is epoxy fatty acid methyl ester.

3. The high-strength, non-blooming PVC cable material according to claim 1, characterized in that: The heat stabilizer is prepared by compounding dibutyltin dilaurate and lanthanum stearate in a mass ratio of 2.5:

1.

4. The high-strength non-blooming PVC cable material according to claim 1, characterized in that: The antioxidant is prepared by mixing antioxidant 1010 and antioxidant 168 in a mass ratio of 1:

2.

5. The high-strength non-blooming PVC cable material according to claim 1, characterized in that: The modified nano filler is obtained by compounding Evonik silicon dioxide AEROSIL R 816 and nano calcium carbonate in a mass ratio of 3:

1.

6. The high-strength non-blooming PVC cable material according to claim 1, characterized in that: The processing aid is composed of Runkelian lubricant WE40, dispersant TEGO Dispers 757W, and Deqian 875 leveling agent in a mass ratio of 1:2:

2.

7. The high-strength non-blooming PVC cable material according to claim 1, characterized in that: The flame retardant is composed of a phosphorus-based flame retardant Clariant OP935 and a HT-211MCA melamine cyanurate nitrogen-based flame retardant in a mass ratio of 2:

1.

8. The high-strength non-blooming PVC cable material according to claim 1, characterized in that: The cross-linking accelerator is Shin-Etsu KBM-503.

9. The method for preparing the high-strength non-blooming PVC cable material according to any one of claims 1 to 8, characterized in that: The following steps are involved: 1) Drying: All raw materials are dried at low temperature before feeding according to the formula; 2) Mixing and plasticizing: At room temperature, in a high-speed mixer, pre-mix the polyvinyl chloride resin, plasticizer, heat stabilizer, antioxidant and processing aid to ensure that the components are evenly dispersed; then, add the modified nanofiller and flame retardant and continue mixing until uniform; finally, increase the mixer temperature to 40-60°C, add the cross-linking accelerator, and stir for 20-40 minutes to promote the plasticization of the resin and further fusion of the components; 3) Granulation and molding: The mixed materials are granulated through a twin-screw extruder at an extrusion temperature of 110-130°C to achieve uniform particle size and regular shape; the granulated cable material is dried at room temperature to remove residual volatiles; According to the specifications and requirements of the cable, the dried cable material is molded by an injection molding machine to produce the required cable products.

10. Use of the high-strength, bloom-free PVC cable material according to any one of claims 1 to 8 in the preparation of high-temperature and high-salt resistant cables.

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