A low-resistance wear-resistant high-density polyethylene silicon core tube and preparation method thereof

Abstract

The invention discloses a low-resistance wear-resistant high-density polyethylene silicon core tube and a preparation method thereof. The silicon core tube comprises an inner layer and an outer layer distributed from the inside to the outside, and the inner wall of the inner layer is uniformly distributed with axially extending convex ribs in the circumferential direction; the inner layer is made of the following components in parts by weight: 60-80 parts of HDPE matrix, 5-15 parts of silicon material, 5-15 parts of modified PTFE micropowder, and 5-15 parts of other additives, and the other additives are at least one of antioxidants, stabilizers, lubricants, and masterbatches; the outer layer is made of the following components in parts by weight: 80-95 parts of HDPE matrix, 5-15 parts of reinforcing material, 0.1-1 parts of antioxidants, 0.1-1 parts of stabilizers, 1-5 parts of lubricants, and 1-5 parts of masterbatches. The invention improves the resistance performance and wear resistance of the silicon core tube, increases the service life of the silicon core tube, and makes the silicon core tube more suitable for use under harsh conditions.

Description

Technical Field

[0001] The invention relates to the technical field of silicon core tubes, and more specifically to a low-resistance, wear-resistant, high-density polyethylene silicon core tube and a preparation method thereof. Background Art

[0002] With the rapid development of communication technology, the demand for communication infrastructure is growing. In the process of laying optical cables, silicon core tubes are widely used as a material to protect optical cables due to their excellent wear resistance and chemical stability. However, the HDPE silicon core tubes in the prior art still have some limitations in practical applications: although the inner wall of the silicon core tube is designed to be relatively smooth, it is still difficult to thread the optical cable in actual construction, and the friction coefficient of the inner wall needs to be further reduced; in addition, in some special environments, such as rocks, sand and other harsh geological conditions, the wear resistance of the existing silicon core tubes is not enough to meet the needs of long-term use, resulting in accelerated pipe wear and affecting the safety and transmission quality of the optical cable. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a low-resistance, wear-resistant, high-density polyethylene silicon core tube and a preparation method thereof, which effectively improves the resistance performance and wear resistance of the silicon core tube, increases the service life of the silicon core tube, and makes the silicon core tube more suitable for use under harsh conditions.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A low-resistance, wear-resistant, high-density polyethylene silicon core tube, the silicon core tube comprising an inner layer and an outer layer distributed from inside to outside, the inner wall of the inner layer being uniformly distributed with axially extending convex ribs in the circumferential direction;

[0006] The inner layer is made of the following components in parts by weight: 60-80 parts of HDPE matrix, 5-15 parts of silicon material, 5-15 parts of modified PTFE micropowder, and 5-15 parts of other additives, wherein the other additives are at least one of antioxidants, stabilizers, lubricants, and masterbatches;

[0007] The outer layer is made of the following components in parts by weight: 80-95 parts of HDPE matrix, 5-15 parts of reinforcing material, 0.1-1 parts of antioxidant, 0.1-1 parts of stabilizer, 1-5 parts of lubricant and 1-5 parts of masterbatch.

[0008] Furthermore, the silicon material is one of silicone oil, silica gel and silicon powder.

[0009] Furthermore, the antioxidants in the inner layer component and the outer layer component are at least one of hindered phenol antioxidants and phosphite antioxidants.

[0010] Furthermore, the antioxidants in the inner layer component and the outer layer component are both CRA-618 phenol-free phosphite.

[0011] Furthermore, the stabilizers in the inner layer component and the outer layer component are at least one of a light stabilizer and an ultraviolet absorber.

[0012] Furthermore, the lubricants in the inner layer and the outer layer components are at least one of zinc stearate, talcum powder, polyethylene wax, YY-703 special engineering plastic coupling compatibilizer lubricant, and wear-resistant modified coupling agent P-31.

[0013] Furthermore, the reinforcing material is one of glass fiber and carbon fiber.

[0014] Furthermore, PTFE micropowder, maleic anhydride and benzoyl peroxide are uniformly mixed, toluene is added, and heated to react under nitrogen protection. After the reaction is completed, the mixture is cooled to room temperature, washed and dried to obtain the modified PTFE micropowder.

[0015] Furthermore, the mass ratio of PTFE powder, maleic anhydride, benzoyl peroxide and toluene is 1000: (50-100): (10-20): (2000-2500); the reaction temperature is 100-110°C.

[0016] A method for preparing a low-resistance, wear-resistant, high-density polyethylene silicon core tube comprises the following steps:

[0017] S1. Weigh the inner layer raw materials according to proportion and mix them evenly;

[0018] S2, weigh the outer layer raw materials according to proportion and mix them evenly;

[0019] S3. The inner layer raw material and the outer layer raw material are melted separately and then extruded and compounded simultaneously. After shaping, cooling, pulling and winding, a silicon core tube is obtained.

[0020] The beneficial effects of the present invention are:

[0021] The PTFE powder is modified by chemical grafting to significantly improve its surface activity and dispersibility, thereby enhancing its bonding with the HDPE matrix and reducing the friction resistance of the inner layer; at the same time, evenly distributed convex ribs are set on the inner wall of the silicon core tube to reduce the contact area between the silicon core tube and the optical cable, further reducing the friction. Furthermore, the wear-resistant modified coupling agent P-31 is used as a lubricant and wear-resistant agent to improve the wear resistance and processing fluidity of the product, CRA-618 phenol-free phosphite is used as an antioxidant to improve the yellowing resistance of the product, and YY-703 special engineering plastic coupling expansion lubricant is used as a lubricant to improve the compatibility and dispersibility of each component. The wear-resistant modified coupling agent P-31, CRA-618 phenol-free phosphite, and YY-703 special engineering plastic coupling expansion lubricant have a synergistic effect, which can further improve the yellowing resistance, aging resistance, and wear resistance of the silicon core tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the low-resistance, wear-resistant, high-density polyethylene silicon core tube of the present invention.

[0023] In the figure: inner layer 1, convex rib 11, outer layer 2. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in 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.

[0025] The low-resistance wear-resistant high-density polyethylene silicon core tube of the present invention comprises an inner layer 1 and an outer layer 2 distributed from inside to outside, and the inner wall of the inner layer 1 is uniformly distributed with axially extending convex ribs 11 (the number of convex ribs is not less than 60) in the circumferential direction. The arrangement of the convex ribs 11 can reduce the contact area between the silicon core tube and the optical cable, and further reduce the friction resistance.

[0026] The inner layer 1 is made of the following components in parts by weight: 60-80 parts of HDPE matrix, 5-15 parts of silicon material, 5-15 parts of modified PTFE powder, and 5-15 parts of other additives, wherein the other additives are at least one of antioxidants, stabilizers, lubricants, and masterbatches. Among them, the silicon material is one of silicone oil, silica gel, and silicon powder.

[0027] The outer layer 2 is made of the following components in parts by weight: 80-95 parts of HDPE matrix, 5-15 parts of reinforcing material, 0.1-1 parts of antioxidant, 0.1-1 parts of stabilizer, 1-5 parts of lubricant, and 1-5 parts of masterbatch, wherein the reinforcing material is one of glass fiber and carbon fiber.

[0028] In the components of the inner layer 1 and the outer layer 2, the antioxidant is at least one of a hindered phenol antioxidant (such as Irganox 1010) and a phosphite antioxidant (such as Irgafos 168), preferably CRA-618 phenol-free phosphite purchased from Qingdao Changrong Chemical Technology Co., Ltd.; the stabilizer is at least one of a light stabilizer (such as Tinuvin 770) and an ultraviolet absorber (such as Tinuvin 326); the lubricant is at least one of zinc stearate, talc, polyethylene wax, YY-703 special engineering plastic coupling compatibilizer lubricant (purchased from Guangzhou Yuantai New Materials Co., Ltd.), and wear-resistant modified coupling agent P-31 (purchased from Wuxi Yiyuan New Materials Technology Co., Ltd.), preferably a combination of YY-703 special engineering plastic coupling compatibilizer lubricant and wear-resistant modified coupling agent P-31.

[0029] The preparation method of the low-resistance wear-resistant high-density polyethylene silicon core tube comprises the following steps:

[0030] S1. Mix PTFE micropowder, maleic anhydride and benzoyl peroxide evenly and place in a reactor, add toluene, heat to 100-110°C under nitrogen protection, and stir at this temperature for 2-3 hours; after the reaction is completed, cool to room temperature, wash with methanol 3-5 times, and dry in a vacuum drying oven at 65-75°C for 18-24 hours to obtain modified PTFE micropowder; the mass ratio of PTFE micropowder, maleic anhydride, benzoyl peroxide and toluene is 1000: (50-100): (10-20): (2000-2500).

[0031] S2, weigh the above inner layer 1 raw materials according to proportion, put them into a mixer, and mix them evenly;

[0032] S3, weigh the above outer layer 2 raw materials according to proportion, put them into a mixer, and mix them evenly;

[0033] S4. The raw materials for inner layer 1 and outer layer 2 are heated and melted by a screw machine respectively (when the raw material for inner layer 1 is melted, the temperatures of zones 1 to 4 are 170-180°C, 180-190°C, 190-200°C, and 200-210°C, respectively; when the raw material for outer layer 2 is melted, the temperatures of zones 1 to 4 are 170-180°C, 180-190°C, 190-200°C, and 200-210°C, respectively), and extruded and compounded simultaneously at 210-220°C, and subjected to vacuum shaping (vacuum degree is -0.05 to -0.08MPa), cooling (cooling temperature is 4 to 9°C), pulling (pulling speed is 6 to 10m / min), and coiling to obtain a silicon core tube.

[0034] The preferred embodiments are as follows:

[0035] Example 1

[0036] A low-resistance, wear-resistant, high-density polyethylene silicon core tube is prepared (comprising an inner layer 1 and an outer layer 2 distributed from inside to outside, and the inner wall of the inner layer 1 is uniformly distributed with 90 axially extending ribs 11 in the circumferential direction).

[0037] S1. Mix PTFE powder, maleic anhydride and benzoyl peroxide evenly and place in a reactor, add toluene, heat to 110°C under nitrogen protection, and stir at this temperature for 2 hours, wherein the mass ratio of PTFE powder, maleic anhydride, benzoyl peroxide and toluene is 1000:72:15:2200; after the reaction, cool to room temperature, wash with methanol 4 times, and dry in a vacuum drying oven at 70°C for 20 hours to obtain modified PTFE powder.

[0038] S2. Weigh the raw materials for inner layer 1 in proportion and place them in a mixer to mix them evenly; the raw materials for inner layer 1 include the following components in parts by weight: 78.4 parts of HDPE matrix, 7 parts of silica gel, 10 parts of modified PTFE micropowder, 9 parts of other additives (including 2 parts of antioxidant Irganox 1010, 0.5 parts of light stabilizer Tinuvin 770, 0.5 parts of ultraviolet absorber Tinuvin 326, 2 parts of talc, 3 parts of polyethylene wax, and 1 part of white masterbatch).

[0039] S3. Weigh the raw materials for outer layer 2 in proportion and place them in a mixer to mix them evenly; the raw materials for outer layer 2 include the following components in parts by weight: 93 parts of HDPE matrix, 8.5 parts of glass fiber, 1 part of antioxidant Irganox 1010, 0.4 parts of light stabilizer Tinuvin 7700, 0.4 parts of ultraviolet absorber Tinuvin 326, 2 parts of talc, 2.5 parts of polyethylene wax, and 1 part of white masterbatch.

[0040] S4. Heat and melt the raw materials for inner layer 1 and outer layer 2 respectively by a screw machine (when the raw material for inner layer 1 is melted, the temperatures of zones 1 to 4 are 180°C, 186°C, 198°C and 210°C, respectively; when the raw material for outer layer 2 is melted, the temperatures of zones 1 to 4 are 175°C, 184°C, 192°C and 205°C, respectively), and extrude and compound them simultaneously at 210°C. After vacuum shaping (vacuum degree is -0.06MPa), cooling (cooling temperature is 4°C), pulling (pulling speed is 8m / min), and coiling, a silicon core tube is obtained.

[0041] Example 2

[0042] A low-resistance, wear-resistant, high-density polyethylene silicon core tube of the same structure is prepared according to the method of Example 1, except that: the mass of the antioxidant Irganox 1010 and the like in the raw material of the inner layer 1 of Example 1 is replaced by CRA-618 phenol-free phosphite, the mass of polyethylene wax and the like is replaced by YY-703 special engineering plastic coupling compatibilizer lubricant, and the mass of talcum powder and the like is replaced by wear-resistant modified coupling agent P-31; the mass of the antioxidant Irganox 1010 and the like in the raw material of the outer layer 2 of Example 1 is replaced by CRA-618 phenol-free phosphite, the mass of polyethylene wax and the like is replaced by YY-703 special engineering plastic coupling compatibilizer lubricant, and the mass of talcum powder and the like is replaced by wear-resistant modified coupling agent P-31.

[0043] Example 3

[0044] A low-resistance, wear-resistant, high-density polyethylene silicon core tube of the same structure is prepared according to the method of Example 1, except that: the weight of the antioxidant Irganox 1010 in the raw material of the inner layer 1 of Example 1 is replaced by CRA-618 phenol-free phosphite, and the weight of the talc in the raw material of the inner layer 1 is replaced by the wear-resistant modified coupling agent P-31; the weight of the antioxidant Irganox 1010 in the raw material of the outer layer 2 of Example 1 is replaced by CRA-618 phenol-free phosphite, and the weight of the talc in the raw material of the outer layer 2 is replaced by the wear-resistant modified coupling agent P-31.

[0045] Example 4

[0046] A low-resistance, wear-resistant, high-density polyethylene silicon core tube of the same structure is prepared according to the method of Example 1, except that: the mass of polyethylene wax and other substances in the raw material of the inner layer 1 of Example 1 is replaced by YY-703 special engineering plastic coupling compatibilizer lubricant, and the mass of talcum powder and other substances is replaced by wear-resistant modified coupling agent P-31; the mass of polyethylene wax and other substances in the raw material of the outer layer 2 of Example 1 is replaced by YY-703 special engineering plastic coupling compatibilizer lubricant, and the mass of talcum powder and other substances is replaced by wear-resistant modified coupling agent P-31.

[0047] Example 5

[0048] A low-resistance, wear-resistant, high-density polyethylene silicon core tube of the same structure was prepared according to the method of Example 1, except that: the mass of the antioxidant Irganox 1010 in the raw material of the inner layer 1 of Example 1 was replaced by CRA-618 phenol-free phosphite, polyethylene wax, etc., and replaced by YY-703 special engineering plastic coupling compatibilizer lubricant; the mass of the antioxidant Irganox 1010 in the raw material of the outer layer 2 of Example 1 was replaced by CRA-618 phenol-free phosphite, polyethylene wax, etc., and replaced by YY-703 special engineering plastic coupling compatibilizer lubricant.

[0049] The performance test results of the silicon core tubes prepared in Examples 1 to 5 are shown in Table 1. It can be seen that the method of the present invention can effectively improve the low-resistance wear resistance of the silicon core tube; by comparing Example 2 with Example 1 and Example 3 to Example 5, it can be seen that after adding the wear-resistant modified coupling agent P-31, CRA-618 phenol-free phosphite, and YY-703 special engineering plastic coupling compatibilizer lubricant for compounding, the synergistic effect between the components is exerted, and the aging performance, yellowing resistance, and wear resistance of the silicon core tube are further improved.

[0050] Table 1

[0051]

[0052] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A low-resistance, wear-resistant, high-density polyethylene silicon core tube, characterized in that: The silicon core tube comprises an inner layer (1) and an outer layer (2) which are arranged from the inside to the outside, wherein the inner wall of the inner layer (1) is uniformly distributed in the circumferential direction with axially extending convex ribs (11); The inner layer (1) is made of the following components in parts by weight: 60-80 parts of HDPE matrix, 5-15 parts of silicon material, 5-15 parts of modified PTFE micropowder, and 5-15 parts of other additives, wherein the other additives are at least one of an antioxidant, a stabilizer, a lubricant, and a masterbatch; The outer layer (2) is made of the following components in parts by weight: 80-95 parts of HDPE matrix, 5-15 parts of reinforcing material, 0.1-1 parts of antioxidant, 0.1-1 parts of stabilizer, 1-5 parts of lubricant, and 1-5 parts of masterbatch; The antioxidants in the inner layer (1) component and the outer layer (2) component are both CRA-618 phenol-free phosphite, and the lubricants in the inner layer (1) and the outer layer (2) component are both YY-703 special engineering plastic coupling compatibilizer lubricant and wear-resistant modified coupling agent P-31.

2. A low-resistance, wear-resistant, high-density polyethylene silicon core tube according to claim 1, characterized in that: The silicon material is one of silicone oil, silica gel and silicon micropowder.

3. The low-resistance, wear-resistant, high-density polyethylene silicon core tube according to claim 1, characterized in that: The stabilizers in the inner layer (1) component and the outer layer (2) component are at least one of a light stabilizer and an ultraviolet absorber.

4. The low-resistance, wear-resistant, high-density polyethylene silicon core tube according to claim 1, characterized in that: The reinforcing material is one of glass fiber and carbon fiber.

5. The low-resistance, wear-resistant, high-density polyethylene silicon core tube according to claim 1, characterized in that: The PTFE micropowder, maleic anhydride and benzoyl peroxide are uniformly mixed, toluene is added, and the mixture is heated to react under nitrogen protection. After the reaction is completed, the mixture is cooled to room temperature, washed and dried to obtain the modified PTFE micropowder.

6. A low-resistance, wear-resistant, high-density polyethylene silicon core tube according to claim 5, characterized in that: The mass ratio of PTFE micropowder, maleic anhydride, benzoyl peroxide and toluene is 1000: (50-100): (10-20): (2000-2500); the reaction temperature is 100-110°C.

7. A method for preparing a low-resistance, wear-resistant, high-density polyethylene silicon core tube according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Weigh the raw material components of the inner layer (1) in proportion and mix them evenly; S2, weigh the raw material components of the outer layer (2) in proportion and mix them evenly; S3, the raw materials for the inner layer (1) and the raw materials for the outer layer (2) are melted separately and then extruded and compounded simultaneously, and after shaping, cooling, pulling and winding, a silicon core tube is obtained.

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