Silane crosslinked polyethylene overhead cable material for laser etching and preparation method thereof

Abstract

The invention discloses a silane crosslinked polyethylene overhead cable material for laser etching and a preparation method thereof. The raw materials comprise a material A and a material B according to a weight ratio of 95: (4-6), wherein the material A comprises the following components in parts by weight: 65-75 parts of LLDPE (Linear Low Density Polyethylene) resin 1, 10-25 parts of LLDPE resin 2, 3-4 parts of a processing aid, 1.9-2.1 parts of silane, 0.095-0.105 part of an initiator and 0.09-0.11 part of an antioxidant; and the material B comprises the following components in parts by weight: 50 parts of LLDPE resin 1, 1.9-2.1 parts of catalyst, 3-5 parts of antioxidant, 49-51 parts of carbon black master batch for laser etching and 5 parts of nano filler. According to the invention, the nano filler and the laser-engraved carbon black master batch are added into the material B, and the chemical reaction between the nano filler and the laser-engraved carbon black master batch is utilized, so that the definition of the extruded silane crosslinked polyethylene overhead cable is not influenced by the content of carbon black during laser lettering. The prepared overhead cable material has the advantages of excellent processability, high extrusion speed and smooth and fine extrusion surface.

Description

Technical Field

[0001] The invention relates to the technical field of wire and cable materials, and in particular to a silane cross-linked polyethylene overhead cable material for laser engraving and a preparation method thereof. Background Art

[0002] In recent years, with increasing environmental protection requirements and advancements in production technology, cable marking has gradually shifted from traditional paint printing to laser printing. Laser printing offers significant advantages: First, it is environmentally friendly, using no chemicals, avoiding air pollution from volatile organic solvents and producing no waste containing heavy metals. Second, it offers superior print quality, using a laser beam to burn a permanent mark on the cable surface, which is more wear-resistant and corrosion-resistant than paint printing. Third, it offers high production efficiency, eliminating the need for complex pre-treatment and drying processes.

[0003] However, the laser printing process presents a pressing challenge: carbon black absorbs the energy of the laser beam, leading to a conflict between carbon black content and laser printing clarity. Higher carbon black content results in less clear printing; however, too low a carbon black content can cause the cable to crack under sunlight. Eliminating the impact of carbon black content on laser printing clarity while ensuring the cable's weather resistance has become a critical challenge for cable material manufacturers. Currently, existing technologies have not effectively resolved this conflict, necessitating the development of a silane-cross-linked polyethylene overhead wire for laser engraving that is unaffected by carbon black content. Summary of the Invention

[0004] The purpose of the present invention is to provide a silane cross-linked polyethylene overhead cable material for laser engraving and a preparation method thereof, so as to solve the problem in the prior art that the clarity of laser printing is affected by the carbon black content, so that the overhead line can meet the weather resistance requirements and achieve clear laser printing.

[0005] The present invention adopts the following technical solutions:

[0006] A silane cross-linked polyethylene aerial cable material for laser engraving, wherein the raw materials are composed of material A and material B in a weight ratio of 95:(4-6);

[0007] Wherein, the material A comprises the following components in parts by weight:

[0008]

[0009] The material B comprises the following components in parts by weight:

[0010]

[0011] Preferably, the melt index of the LLDPE resin 1 added to the material A and the material B is 2.0±0.2 g / 10 min (190° C.×2.16 kg).

[0012] More preferably, the LLDPE resin 1 added to the material A and the material B is Zhongmei LLDPE DFDA-7042.

[0013] Preferably, the melt index of the LLDPE resin 2 in the material A is 8-10 g / 10 min (150° C.×2.16 kg).

[0014] Preferably, the LLDPE resin 2 in the material A is Zhenhai LLDPE M2320.

[0015] Preferably, the processing aid added to the material A is FR-3, the silane added is vinyltrimethoxysilane A171, and the initiator added is dicumyl peroxide DCP.

[0016] Preferably, the antioxidant added to the material A and the material B is 2,2'-thiobis[ethyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0017] Preferably, the catalyst in the material B is dibutyltin dilaurate, the added laser engraving carbon black masterbatch is PE2772T, and the added nano filler is CCR.

[0018] The present invention also provides a method for preparing a silane cross-linked polyethylene aerial cable material for laser engraving, comprising the steps of preparing a material A, preparing a material B, and uniformly mixing the materials A and B according to a proportion to obtain the silane cross-linked polyethylene aerial cable material for laser engraving;

[0019] The preparation method of material A comprises the following steps:

[0020] S1-1. Weigh all the raw materials of material A according to the recipe and set aside;

[0021] S1-2, drying LLDPE resin 1 and LLDPE resin 2, adding processing aids and mixing evenly to obtain a primary mixture;

[0022] S1-3. While the kneading pot wall is heated, silane, initiator, and antioxidant are added to the primary mixture of step S1-2 and mixed at high speed, and then extruded through a twin-screw extruder to obtain pellet A;

[0023] S1-4, sequentially hot-air drying and cold-air drying of the pellet A obtained in step S1-3, followed by vacuum packaging, to obtain a pellet A having a moisture content of 0.2% by weight;

[0024] The preparation method of the material B comprises the following steps:

[0025] S2-1. Weigh all the raw materials of material B according to the formula, add them into a banbury mixer and knead them into a mass. Then extrude them through a single screw extruder to obtain pellets B.

[0026] S2-2. The granular material B prepared in step S2-1 is sequentially subjected to hot air drying and cold air drying, and then packaged to obtain material B having a moisture content of ≤0.2% by weight.

[0027] Preferably, in the material A preparation step S1-2, the LLDPE resin is dried at a temperature of 90-95° C. and for a time of 1.5-2.5 h.

[0028] Preferably, in the material A preparation step S1-3, the heating temperature of the kneading pot wall is 45-55° C., the rotation speed of the high-speed mixing is 475-525 rpm, and the mixing time is 2.5-3.5 min.

[0029] Preferably, in the step S1-3 of preparing material A, the temperature of the twin-screw extrusion granulation is: 150°C in zone I, 120°C in zone II, 160°C in zone III, 160°C in zone IV, 160°C in zone V, 160°C in zone VI, 180°C in zone VII, 190°C in zone VIII, 200°C in zone IX, and 230°C in the die.

[0030] Preferably, in the material B preparation step S2-1, the temperature of single-screw extrusion granulation is: 140°C in zone I, 155°C in zone II, 165°C in zone III, 170°C in zone IV, and 175°C in zone V.

[0031] Preferably, in the preparation method of material A and material B, the hot air drying temperature is 65-70° C., the drying time is 1.5-2.0 hours, and the cold air drying time is 1-1.5 hours.

[0032] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0033] A. This invention adds a nanofiller and a laser-engraved carbon black masterbatch to material B. By utilizing the chemical reaction between the two, the resulting extruded silane-crosslinked polyethylene overhead cable exhibits laser-printed clarity that is unaffected by the carbon black content. The resulting overhead cable material exhibits excellent processing properties, fast extrusion speed, and a smooth, fine extruded surface.

[0034] B. The silane cross-linked polyethylene overhead cable material for laser engraving prepared by the present invention has product performance that meets the requirements of GB / T12527-2008 and GB / T14049-2008 standards, specifically: high tensile strength, large elongation at break, stable thermal aging performance, small thermal elongation and permanent deformation, good low-temperature impact performance, and high volume resistivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present invention, the following will briefly introduce the drawings required for use in the specific embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a process flow chart of the production of silane cross-linked polyethylene overhead wire material A for laser engraving of the present invention;

[0037] Figure 2 This is a process flow chart for producing silane cross-linked polyethylene overhead wire B material for laser engraving according to the present invention. DETAILED DESCRIPTION

[0038] The present invention may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the present invention to those skilled in the art. All other embodiments derived by those skilled in the art based on the embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention.

[0039] Example 1:

[0040] This embodiment provides a silane cross-linked polyethylene aerial cable material for laser engraving, wherein the raw materials are composed of material A and material B in a weight ratio of 95:5;

[0041] Wherein, the material A comprises the following components in parts by weight:

[0042]

[0043] The material B comprises the following components in parts by weight:

[0044]

[0045] In the material A of this embodiment, the added LLDPE resin 1 is Zhongmei LLDPE DFDA-7042, the added LLDPE resin 2 is Zhenhai LLDPE M2320, the added processing aid is FR-3, the added silane is vinyltrimethoxysilane A171, the added initiator is diisopropyl peroxide DCP, and the added antioxidant is 2,2'-thiobis[ethyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (abbreviated as 1035).

[0046] In the material B of this embodiment, the added LLDPE resin 1 is Zhongmei LLDPE DFDA-7042, the added antioxidant is 2,2'-thiobis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)ethyl propionate] (abbreviated as 1035), the added catalyst is dibutyltin dilaurate, the added laser carving carbon black masterbatch is PE2772T produced by Guangdong Jiucai New Materials Co., Ltd., and the added nanofiller is CCR produced by Qingyuan Qingxin District Shuangrong New Materials Co., Ltd.

[0047] like Figure 1 As shown, the preparation method of material A is as follows:

[0048] S1-1. Weigh all the raw materials of material A according to the recipe and set aside;

[0049] S1-2, drying LLDPE DFDA-7042 and LLDPE M2320 at 90°C for 2 hours, and then mixing them with processing aid FR-3 to obtain a primary mixture;

[0050] S1-3. While the kneading pot wall is heated to 50°C, silane LT-171, initiator DCP, and antioxidant 1035 are added to the primary mixture of step S1-2 and mixed at high speed for 3 minutes. The mixture is then fed into a twin-screw extruder. The extrusion temperature is as follows:

[0051] Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ Ⅶ Ⅷ Ⅸ Machine head 150 120 160 160 160 160 180 190 200 230

[0052] S1-4. The extruded strips are drawn into pellets in a water trough. The pellets are first dried in a 60°C hot air dryer for 1 hour, then dried in a cold air dryer for 1 hour, and then packaged in vacuum aluminum-plastic composite bags.

[0053] like Figure 2 As shown, the preparation method of material B is as follows:

[0054] S2-1. Weigh all the raw materials of material B according to the formula, add them into the internal mixer and knead them into a mass. Then feed them into the single screw extruder. The extrusion temperature is as follows:

[0055] Heating zone Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ temperature 140 155 165 170 175

[0056] S2-2. Extrusion pelletizing. The pellets are first pumped into a 60°C hot air dryer and dried for 1 hour, then pumped into a cold air dryer and dried for 1 hour, and then vacuum packed in aluminum-plastic composite bags.

[0057] Example 2:

[0058] This embodiment provides a silane cross-linked polyethylene aerial cable material for laser engraving, wherein the raw materials are composed of material A and material B in a weight ratio of 95:4;

[0059] Wherein, the material A comprises the following components in parts by weight:

[0060]

[0061] The material B comprises the following components in parts by weight:

[0062]

[0063] In the material A of this embodiment, the added LLDPE resin 1 is Zhongmei LLDPE DFDA-7042, the added LLDPE resin 2 is Zhenhai LLDPE M2320, the added processing aid is FR-3, the added silane is vinyltrimethoxysilane A171, the added initiator is diisopropyl peroxide DCP, and the added antioxidant is 2,2'-thiobis[ethyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (abbreviated as 1035).

[0064] In the material B of this embodiment, the added LLDPE resin 1 is Zhongmei LLDPE DFDA-7042, the added antioxidant is 2,2'-thiobis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)ethyl propionate] (abbreviated as 1035), the added catalyst is dibutyltin dilaurate, the added laser carving carbon black masterbatch is PE2772T produced by Guangdong Jiucai New Materials Co., Ltd., and the added nanofiller is CCR produced by Qingyuan Qingxin District Shuangrong New Materials Co., Ltd.

[0065] like Figure 1 As shown, the preparation method of material A is as follows:

[0066] S1-1. Weigh all the raw materials of material A according to the recipe and set aside;

[0067] S1-2, drying LLDPE DFDA-7042 and LLDPE M2320 at 95°C for 1.5 hours, and then mixing them with processing aid FR-3 to obtain a primary mixture;

[0068] S1-3. While the kneading pot wall is heated to 45°C, silane LT-171, initiator DCP, and antioxidant 1035 are added to the primary mixture of step S1-2 and mixed at high speed for 3.5 minutes. The mixture is then fed into a twin-screw extruder. The extrusion temperature is as follows:

[0069] Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ Ⅶ Ⅷ Ⅸ Machine head 150 120 160 160 160 160 180 190 200 230

[0070] S1-4. The extruded strips are stretched and pelletized in a water trough. The pellets are first pumped into a 65℃ hot air dryer and dried for 2 hours, then pumped into a cold air dryer and dried for 1 hour, and then vacuum-packed in aluminum-plastic composite bags.

[0071] like Figure 2 As shown, the preparation method of material B is as follows:

[0072] S2-1. Weigh all the raw materials of material B according to the formula, add them into the internal mixer and knead them into a mass. Then feed them into the single screw extruder. The extrusion temperature is as follows:

[0073] Heating zone Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ temperature 140 155 165 170 175

[0074] S2-2. Extrusion and pelletization. The pellets are first pumped into a 65°C hot air dryer and dried for 2 hours, then pumped into a cold air dryer and dried for 1 hour, and then vacuum-packed into aluminum-plastic composite bags.

[0075] Example 3:

[0076] This embodiment provides a silane cross-linked polyethylene aerial cable material for laser engraving, wherein the raw materials are composed of material A and material B in a weight ratio of 95:6;

[0077] Wherein, the material A comprises the following components in parts by weight:

[0078]

[0079] The material B comprises the following components in parts by weight:

[0080]

[0081] In the material A of this embodiment, the added LLDPE resin 1 is Zhongmei LLDPE DFDA-7042, the added LLDPE resin 2 is Zhenhai LLDPE M2320, the added processing aid is FR-3, the added silane is vinyltrimethoxysilane A171, the added initiator is diisopropyl peroxide DCP, and the added antioxidant is 2,2'-thiobis[ethyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (abbreviated as 1035).

[0082] In the material B of this embodiment, the added LLDPE resin 1 is Zhongmei LLDPE DFDA-7042, the added antioxidant is 2,2'-thiobis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)ethyl propionate] (abbreviated as 1035), the added catalyst is dibutyltin dilaurate, the added laser carving carbon black masterbatch is PE2772T produced by Guangdong Jiucai New Materials Co., Ltd., and the added nanofiller is CCR produced by Qingyuan Qingxin District Shuangrong New Materials Co., Ltd.

[0083] like Figure 1 As shown, the preparation method of material A is as follows:

[0084] S1-1. Weigh all the raw materials of material A according to the recipe and set aside;

[0085] S1-2, drying LLDPE DFDA-7042 and LLDPE M2320 at 92°C for 2.5 hours, and then mixing them with processing aid FR-3 to obtain a primary mixture;

[0086] S1-3. While the kneading pot wall is heated to 55°C, silane LT-171, initiator DCP, and antioxidant 1035 are added to the primary mixture of step S1-2 and mixed at high speed for 2.5 minutes. The mixture is then fed into a twin-screw extruder. The extrusion temperature is as follows:

[0087] Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ Ⅶ Ⅷ Ⅸ Machine head 150 120 160 160 160 160 180 190 200 230

[0088] S1-4. The extruded strips are drawn into pellets in a water trough. The pellets are first dried in a 75°C hot air dryer for 1.5 hours, then dried in a cold air dryer for 1.5 hours, and then packaged in vacuum aluminum-plastic composite bags.

[0089] like Figure 2 As shown, the preparation method of material B is as follows:

[0090] S2-1. Weigh all the raw materials of material B according to the formula, add them into the internal mixer and knead them into a mass. Then feed them into the single screw extruder. The extrusion temperature is as follows:

[0091] Heating zone Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ temperature 140 155 165 170 175

[0092] S2-2. Extrusion pelletizing. The pellets are first pumped into a 75°C hot air dryer and dried for 1.5 hours, then pumped into a cold air dryer and dried for 1.5 hours, and then vacuum packed in aluminum-plastic composite bags.

[0093] Comparative Example 1:

[0094] Compared with Example 1, this comparative example only replaces the nanofiller in material B with the common filler KB-2250, and the other contents are the same as Example 1.

[0095] Comparative Example 2:

[0096] Compared with Example 1, this comparative example only replaces the laser-engraved carbon black masterbatch in material B with ordinary carbon black masterbatch CAB2020, and other contents are the same as Example 1.

[0097] After the material A and material B prepared in the above Example 1 and Comparative Examples 1 to 2 were mixed uniformly in a ratio of 95:5, they were extruded on a φ70 machine. The wires obtained in Example 1 and Comparative Examples 1-2 were subjected to laser printing comparison and performance testing, and their performance data are shown in the performance test results in Table 1.

[0098] Table 1 Performance test results of the products obtained in Example 1 and Comparative Examples 1-2

[0099]

[0100]

[0101] From the data in Table 1, it can be seen that in terms of laser printing clarity, Example 1 uses a combination of laser engraving carbon black masterbatch and nanofiller, and the laser printing effect reaches "very clear", while after the nanofiller is replaced by an ordinary filler in Comparative Example 1, the printing effect is reduced to "relatively clear", and Comparative Example 2 replaces the laser engraving carbon black masterbatch with an ordinary carbon black masterbatch, and the printing is "unclear", which shows that the synergistic effect of the two can eliminate the negative impact of carbon black on laser printing and solve the contradiction between carbon black content and printing clarity in traditional technology. In addition, the physical and mechanical properties are excellent. The tensile strength of Example 1 is 20MPa and the elongation at break is 450%, which far exceeds the standard requirements. The performance fluctuation after thermal aging is small, the thermal elongation is 100%, and the permanent deformation is 2%, which all meet the standards, reflecting good mechanical properties and heat stability. In terms of weather resistance and insulation, Example 1 passed the -76°C low-temperature impact test, and the volume resistivity at 20°C reached 8×10 13 In summary, the present invention significantly improves the clarity of laser printing while ensuring various material properties, and has outstanding practical value.

[0102] Any matters not described in the present invention are applicable to the prior art.

[0103] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A silane cross-linked polyethylene aerial cable material for laser engraving, characterized in that: The raw materials are composed of material A and material B in a weight ratio of 95:(4-6); Wherein, the material A comprises the following components in parts by weight: The material B comprises the following components in parts by weight:

2. The silane cross-linked polyethylene overhead cable material for laser engraving according to claim 1, characterized in that: The melt index of the LLDPE resin 1 added to the A material and the B material is 2.0±0.2g / 10min (190°C×2.16kg); The melt index of the LLDPE resin 2 in the material A is 8-10 g / 10 min (150° C.×2.16 kg).

3. The silane cross-linked polyethylene aerial cable material for laser engraving according to claim 1, characterized in that: The processing aid added to the material A is FR-3, the silane added is vinyltrimethoxysilane, and the initiator added is dicumyl peroxide.

4. The silane cross-linked polyethylene overhead cable material for laser engraving according to claim 1, characterized in that: The antioxidant added to the material A and the material B is 2,2'-thiobis[ethyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

5. The silane cross-linked polyethylene overhead cable material for laser engraving according to claim 1, characterized in that: The catalyst in the material B is dibutyltin dilaurate, the laser-engraved carbon black masterbatch added is PE2772T, and the nano filler added is CCR.

6. A method for preparing the silane cross-linked polyethylene overhead cable material for laser engraving according to any one of claims 1 to 5, characterized in that: The method comprises the steps of preparing material A, preparing material B, and uniformly mixing material A and material B according to a ratio to obtain the silane cross-linked polyethylene aerial cable material for laser engraving; The preparation method of material A comprises the following steps: S1-1. Weigh all the raw materials of material A according to the recipe and set aside; S1-2, drying LLDPE resin 1 and LLDPE resin 2, adding processing aids and mixing evenly to obtain a primary mixture; S1-3. While the kneading pot wall is heated, silane, initiator, and antioxidant are added to the primary mixture of step S1-2 and mixed at high speed, and then extruded through a twin-screw extruder to obtain pellet A; S1-4, sequentially hot-air drying and cold-air drying of the pellet A obtained in step S1-3, followed by vacuum packaging, to obtain a pellet A having a moisture content of 0.2% by weight; The preparation method of the material B comprises the following steps: S2-1. Weigh all the raw materials of material B according to the formula, add them into a banbury mixer and knead them into a mass. Then extrude them through a single screw extruder to obtain pellets B. S2-2. The granular material B prepared in step S2-1 is sequentially subjected to hot air drying and cold air drying, and then packaged to obtain material B having a moisture content of ≤0.2% by weight.

7. The preparation method according to claim 6, characterized in that In the material A preparation step S1-2, the LLDPE resin is dried at a temperature of 90-95° C. for a time of 1.5-2.5 h.

8. The preparation method according to claim 6, characterized in that In the material A preparation step S1-3, the heating temperature of the kneading pot wall is 45-55°C, the rotation speed of the high-speed mixing is 475-525 rpm, and the mixing time is 2.5-3.5 min.

9. The preparation method according to claim 6, characterized in that In the step S1-3 of preparing material A, the temperature of the twin-screw extruder for granulation is: 150°C in zone I, 120°C in zone II, 160°C in zone III, 160°C in zone IV, 160°C in zone V, 160°C in zone VI, 180°C in zone VII, 190°C in zone VIII, 200°C in zone IX, and 230°C in the die head; In the material B preparation step S2-1, the temperature of single-screw extrusion granulation is: 140°C in zone I, 155°C in zone II, 165°C in zone III, 170°C in zone IV, and 175°C in zone V.

10. The preparation method according to claim 6, characterized in that In the preparation method of material A and material B, the hot air drying temperature is 65-70° C., the drying time is 1.5-2.0 hours, and the cold air drying time is 1-1.5 hours.

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