High-density polyethylene composite material, preparation method and optical cable sheath

Abstract

The invention discloses a high-density polyethylene composite material, a preparation method and an optical cable sheath, and relates to the technical field of optical cables, the high-density polyethylene composite material is prepared from the following raw materials: high-density polyethylene, linear low-density polyethylene, a composite light stabilizer and an additive, the preparation method comprises the following steps: S1, premixing the high-density polyethylene, the linear low-density polyethylene, the composite light stabilizer, the antioxidant, the lubricant and the dispersing agent in a high-speed mixer according to a certain proportion, and then feeding into a double-screw extruder for melt mixing; s2, the extruded optical cable sheath material is rapidly cooled through a water cooling tank, and then is further cooled through an air cooling device; s3, stretching and shaping the cooled optical cable sheath material through a traction machine; and S4, cutting or rolling the shaped optical cable sheath material according to customer requirements. The ultraviolet aging resistance of the optical cable sheath can be effectively improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of optical cables, in particular to a high-density polyethylene composite material, a preparation method and an optical cable sheath. BACKGROUND

[0002] In today's information age, the importance of communication networks is increasingly prominent. As the key infrastructure of communication networks, the safe and stable operation of optical cables is crucial. Optical cable sheath pipes, as important components for protecting optical cables, bear the heavy responsibility of resisting damage to optical cables caused by external environmental factors (such as mechanical stress, chemical corrosion, moisture, temperature changes, etc.), and are widely used in many fields such as communication, power, broadcasting and television.

[0003] With the vigorous development of emerging technologies such as 5G and the Internet of Things, the number and quality requirements of optical cable laying are continuously improving, and higher standards for the performance of optical cable sheath pipes are also put forward.

[0004] At present, among the common optical cable sheath pipe materials on the market, high-density polyethylene has become one of the commonly used materials for optical cable sheath pipes due to its good corrosion resistance, insulation, flexibility and relatively low cost.

[0005] High-density polyethylene has poor aging resistance and is prone to cracking under long-term sunlight, which can cause damage to the optical cable sheath. SUMMARY

[0006] In order to improve the anti-UV aging performance of high-density polyethylene and prolong the service life of the high-density polyethylene optical cable sheath, and reduce the adverse effects of UV aging on the optical cable sheath, the application provides a high-density polyethylene composite material, a preparation method and an optical cable sheath.

[0007] In a first aspect, the application provides a high-density polyethylene composite material, which adopts the following technical solution: The high-density polyethylene composite material comprises the following raw materials by weight: 50-70 parts of high-density polyethylene, 20-30 parts of linear low-density polyethylene, 2-5 parts of a composite light stabilizer, and 3-7 parts of an additive, wherein the composite light stabilizer is a light absorber modified titanium dioxide loaded black silicon dioxide particles.

[0008] By adopting the technical scheme, the high crystallinity of the HDPE endows the material with excellent rigidity and tensile strength, and the short-chain branched structure of the LLDPE can significantly improve the impact resistance and elongation at break. The molecular chain entanglement property of the LLDPE is combined with the dense crystalline structure of the HDPE, which can effectively resist the penetration of chemical media. The HDPE / LLDPE blending system has a co-crystallization phenomenon, and the thickness distribution range of the crystal sheet is expanded, thereby improving the thermal stability of the material. The ultraviolet rays are absorbed and scattered by the black silicon dioxide and the light absorber, thereby effectively reducing the oxidative damage of the high-density polyethylene composite material caused by light. The titanium dioxide is used as an intermediate core and a load body, and then the black silicon dioxide is connected by the light absorber, thereby improving the overall stability.

[0009] Preferably, the composite light stabilizer is prepared by the following steps: S1, dissolving urea, tetrabutyl titanate and light absorber in anhydrous ethanol in sequence, then heating to 100℃ for 48h, then washing the product with distilled water and ethanol respectively, and drying to obtain light absorber modified porous titanium dioxide; S2, adding carbon black particles to deionized water and ultrasonic to make the carbon black particles uniformly dispersed in the deionized water, then adding tetraethyl orthosilicate, and then adding 25% ammonia solution dropwise, and stirring and mixing for 30min; Then add the light absorber modified porous titanium dioxide prepared in S1, stir at room temperature for 12h, add anhydrous ethanol, centrifuge and wash repeatedly, and freeze-dry to obtain the composite light stabilizer.

[0010] By adopting the technical scheme, the light absorber is first combined on the titanium dioxide particles to prepare titanium dioxide that can absorb ultraviolet rays, and then black silicon dioxide particles are formed on the surface of the titanium dioxide, and the outer layer of black silicon dioxide serves as a protective layer and a light absorption layer. Firstly, the black silicon dioxide protects the light absorber during the preparation of the high-density polyethylene composite material, reducing the decomposition of the light absorber under high temperature conditions; secondly, the ultraviolet rays that are not absorbed by the black silicon dioxide layer produce active free radicals, and the light absorber captures the active free radicals to stabilize the high-density polyethylene; finally, the long chain of the light absorber has an adsorption effect on the carbon black nanometer powder, and because a dense black silicon dioxide layer is not formed on the surface of the titanium dioxide, the composite light stabilizer is also easier to capture active free radicals.

[0011] Preferably, the composite light stabilizer is surface treated with a coupling agent after being prepared.

[0012] By adopting the technical scheme, the surface of the composite light stabilizer is treated by using the silane coupling agent, so that the compatibility of the composite light stabilizer in the high-density polyethylene composite material is improved, and the overall performance of the high-density polyethylene composite material is improved.

[0013] Preferably, the coupling agent surface treatment comprises the following operations: the composite light stabilizer and the silane coupling agent are added into anhydrous ethanol, the weight ratio of the three is 1:5:10, the reaction is carried out at 50℃ for 6h, and drying is carried out after centrifugation, so that the surface treatment is completed.

[0014] By adopting the technical scheme, the composite light stabilizer and the silane coupling agent are reacted in anhydrous ethanol as a medium at 50℃, so that the surface of the composite light stabilizer is treated by grafting, and the treated composite light stabilizer can stably exist in the high-density polyethylene composite material, thereby improving the overall stability.

[0015] Preferably, the additives include antioxidants, lubricants and dispersants, and the weight ratio of the three is (1-3):(1-2):(1-2).

[0016] By adopting the technical scheme, the antioxidant can improve the antioxidant performance of the high-density polyethylene composite material and improve the thermal stability of the high-density polyethylene composite material. The lubricant can reduce the surface friction coefficient and improve the demolding performance in the processing of HDPE. The dispersant can improve the dispersion uniformity of the composite light stabilizer and other raw materials in the high-density polyethylene, and improve the interfacial bonding capacity of the additives and the high-density polyethylene. The antioxidant, lubricant and dispersant are limited and adjusted, so that the performance is reduced due to excessive addition of the additives, or the performance of the high-density polyethylene composite material cannot reach the expected level due to insufficient addition of the additives.

[0017] Preferably, the antioxidant includes tris(2,4-di-tert-butylphenyl) phosphite and 4,4'-methylene bis(2,6-di-tert-butylphenol), and the weight ratio of the two is 1:2.

[0018] By adopting the technical scheme, tris(2,4-di-tert-butylphenyl) phosphite is used as an auxiliary antioxidant, 4,4'-methylene bis(2,6-di-tert-butylphenol) is used as a main antioxidant, and the two are compounded to play a synergistic effect, thereby further improving the thermal stability of the composite material.

[0019] In the second aspect, the application provides a preparation method of a high-density polyethylene composite material, which adopts the following technical scheme: The method comprises the following steps: S1, mixing high-density polyethylene, linear low-density polyethylene, a composite light stabilizer, an antioxidant, a lubricant and a dispersant in a certain proportion in a high-speed mixer, and then feeding them into a double-screw extruder for melt mixing.

[0020] S2, rapidly cooling the extruded optical cable sheath material through a water cooling tank, and further cooling the material through an air cooling device.

[0021] S3, stretching and shaping the cooled optical cable sheath material through a traction machine, and controlling the traction speed and the extrusion speed at 1:1-1:1.5.

[0022] S4, cutting or winding the shaped optical cable sheath material according to customer requirements.

[0023] Preferably, in S1, the parameters are as follows: screw rotation speed: 200-400 rpm, feeding section: 180-200℃, compression section: 200-220℃, melting section: 210-230℃, exhaust section: 200-220℃, homogenization section: 200-220℃, head / mold: 200-220℃, main machine torque: 30-50%, head pressure: 8-15 MPa.

[0024] Preferably, in S2, the temperature of the cooling water is 15-25℃, and the air speed of the air cooling device is 2-5 m / s.

[0025] In a third aspect, the application provides an optical cable sheath prepared from the high-density polyethylene composite material.

[0026] In summary, the application has at least one of the following beneficial technical effects: 1. When the optical cable sheath is exposed to light for a long time, the composite light stabilizer can absorb ultraviolet light, thereby effectively improving the ultraviolet aging resistance of high-density polyethylene, reducing the damage of ultraviolet light to the optical cable sheath, and prolonging the service life of the optical cable sheath. 2. After the light absorber is fixed by titanium dioxide, a black silica protective layer is generated on the surface of the titanium dioxide. The black silica protective layer can not only absorb ultraviolet light, but also protect the light absorber during the processing of the optical cable sheath, thereby reducing the damage of the light absorber during the processing, improving the effect of the light absorber, and dispersing the light absorber uniformly through the dispersion of the black silica in the raw material, so that the light absorber can better capture active free radicals and improve the overall stability. In addition, because the black silica forms a non-dense protective layer, the ultraviolet light passing through the black silica is also partially absorbed by the titanium dioxide, thereby further eliminating the adverse effects of ultraviolet light on the optical cable sheath. DETAILED DESCRIPTION

[0027] The application is further described in detail below in combination with examples and comparative examples.

[0028] The raw materials in the application are commercially available.

[0029] The high-density polyethylene and the linear low-density polyethylene are both injection molding grades, The light absorber is 4-benzoyloxy-2, 2, 6, 6-tetramethylpiperidine, The coupling agent is vinyltriethoxysilane, The antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite and 4, 4'-methylenebis (2, 6-di-tert-butylphenol), The lubricant is polyvinyl alcohol, The dispersant is stearic acid, The carbon black particle size is 50 nm.

[0030] The application prepares different composite light stabilizers through preparation examples.

[0031] Preparation Example 1 The preparation example discloses a composite light stabilizer, which is prepared by the following steps: S1, dissolve urea, tetrabutyl titanate and light absorber in anhydrous ethanol in a weight ratio of 10:10:1, then heat to 100℃ for 48h. Then wash the product with distilled water and ethanol respectively, and dry to obtain light absorber modified porous titanium dioxide.

[0032] S2, add 0.5g carbon black particles to 500mL deionized water and ultrasonic to make the carbon black particles uniformly dispersed in the deionized water, add 60mL tetraethyl orthosilicate, and then add 5mL of 25% ammonia solution dropwise, stir and mix for 30min; Then add 0.5g light absorber modified porous titanium dioxide prepared in S1, stir at room temperature for 12h, add anhydrous ethanol, centrifuge and wash repeatedly, and freeze-dry to obtain the composite light stabilizer.

[0033] Preparation Example 2 The preparation example discloses a composite light stabilizer, which is prepared by the following steps: Dissolve urea, tetrabutyl titanate and light absorber in anhydrous ethanol in a weight ratio of 10:10:1, then heat to 100℃ for 48h. Then wash the product with distilled water and ethanol respectively, and dry to obtain light absorber modified porous titanium dioxide, which is used as the composite light stabilizer.

[0034] Preparation Example 3 The preparation example discloses a composite light stabilizer, which is prepared by the following steps: S1, urea and tetrabutyl titanate were sequentially added to anhydrous ethanol in a weight ratio of 1:1 for dissolution, and then heated to 100°C for 48h. The product was then washed with distilled water and ethanol, and dried to obtain the light absorber modified porous titanium dioxide.

[0035] S2, 0.5g of carbon black particles were added to 500mL of deionized water and ultrasonicated to uniformly disperse the carbon black particles in the deionized water. 60mL of tetraethyl orthosilicate was added, followed by the dropwise addition of 5mL of a 25% ammonia solution. The mixture was stirred for 30min. Then 0.5g of the light absorber modified porous titanium dioxide prepared in S1 was added, and stirred at room temperature for 12h. After the addition of anhydrous ethanol, centrifugation and repeated washing were performed, and the composite light stabilizer was prepared by freeze-drying.

[0036] Preparation Example 4 The present preparation example discloses a composite light stabilizer prepared by the following steps: 0.5g of carbon black particles were added to 500mL of deionized water and ultrasonicated to uniformly disperse the carbon black particles in the deionized water. 60mL of tetraethyl orthosilicate was added, followed by the dropwise addition of 5mL of a 25% ammonia solution. The mixture was stirred for 30min. Then 0.5g of the light absorber modified porous titanium dioxide prepared in S1 was added, and stirred at room temperature for 12h. After the addition of anhydrous ethanol, centrifugation and repeated washing were performed, and the composite light stabilizer was prepared by freeze-drying.

[0037] Preparation Example 5 The present preparation example discloses a composite light stabilizer prepared by the following steps: Urea and tetrabutyl titanate were sequentially added to anhydrous ethanol in a weight ratio of 1:1 for dissolution, and then heated to 100°C for 48h. The product was then washed with distilled water and ethanol, and dried to obtain the light absorber modified porous titanium dioxide.

[0038] Preparation Example 6 The present preparation example discloses a composite light stabilizer prepared by the following steps: 0.5g of carbon black particles were added to 500mL of deionized water and ultrasonicated to uniformly disperse the carbon black particles in the deionized water. 60mL of tetraethyl orthosilicate was added, followed by the dropwise addition of 5mL of a 25% ammonia solution. The mixture was stirred for 30min. Stirring was performed at room temperature for 12h. After the addition of anhydrous ethanol, centrifugation and repeated washing were performed, and the composite light stabilizer was prepared by freeze-drying.

[0039] Preparation Example 7 The present preparation example discloses a composite light stabilizer prepared by the following steps: S1, dissolve urea, tetrabutyl titanate and light absorber in anhydrous ethanol in the weight ratio of 10:10:1, then heat to 100℃ for 48h. Then the product is washed with distilled water and ethanol respectively, and dried to obtain light absorber modified porous titanium dioxide.

[0040] S2, add 0.5g carbon black particles to 500mL deionized water and ultrasonic to make the carbon black particles uniformly dispersed in the deionized water, add 60mL tetraethyl orthosilicate, then add 5mL of 25% ammonia solution, stir and mix for 30min; Then add 0.5g light absorber modified porous titanium dioxide prepared in S1, stir at room temperature for 12h, add anhydrous ethanol, centrifuge and wash repeatedly, and freeze-dry to obtain a composite light stabilizer.

[0041] S3, add the composite light stabilizer and silane coupling agent to anhydrous ethanol, the weight ratio of the three is 1:5:10, react at 50℃ for 6h, dry after centrifugation, thus completing the surface treatment.

[0042] The following is an example of preparing a high-density polyethylene composite material.

[0043] Example 1 This example discloses a high-density polyethylene composite material, and a cable jacket is made therefrom, which is prepared by the following steps: S1, first pre-mix 50kg high-density polyethylene, 20kg linear low-density polyethylene, 2kg composite light stabilizer prepared in Preparation Example 1, 0.5kg tris(2,4-di-tert-butylphenyl) phosphite, 0.5kg 4,4'-methylenebis(2,6-di-tert-butylphenol), 1kg polyvinyl alcohol and 1kg stearic acid in a high-speed mixer, and then melt mix in a twin-screw extruder.

[0044] The specific parameters are: Screw rotation speed: 200rpm Feeding section: 180℃ Compression section: 200℃ Melting section: 210℃ Exhaust section: 200℃ Homogenization section: 200℃ Die head / mold: 200℃ Main machine torque: 30% Die head pressure: 8MPa S2, the extruded cable jacket material is quickly cooled in a water cooling tank, and then further cooled by an air cooling device, the cooling water temperature is 15℃, and the air cooling speed is 2m / s.

[0045] S3, the cooled cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.3.

[0046] S4, the shaped cable sheath material is cut or wound according to customer requirements.

[0047] Example 2 The embodiment discloses a high-density polyethylene composite material and a cable sheath made of the following steps: S1, 60 kg of high-density polyethylene, 25 kg of linear low-density polyethylene, 3.5 kg of the composite light stabilizer prepared in Preparation Example 1, 1 kg of tris(2, 4-di-tert-butylphenyl) phosphite, 1 kg of 4, 4'-methylenebis(2, 6-di-tert-butylphenol), 1.5 kg of polyvinyl alcohol and 1.5 kg of stearic acid are premixed in a high-speed mixer, and then melt-mixed in a twin-screw extruder.

[0048] The specific parameters are: Screw rotation speed: 300 rpm Feeding section: 190°C Compression section: 210°C Melt section: 220°C Exhaust section: 210°C Homogenization section: 210°C Die / mold: 210°C Main machine torque: 40% Die pressure: 12 MPa S2, the extruded cable sheath material is rapidly cooled by a water cooling tank, and then further cooled by an air cooling device, the temperature of the cooling water is 20°C, and the air cooling speed is 3 m / s.

[0049] S3, the cooled cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.3.

[0050] S4, the shaped cable sheath material is cut or wound according to customer requirements.

[0051] Example 3 The embodiment discloses a high-density polyethylene composite material and a cable sheath made of the following steps: S1, 60 kg of high-density polyethylene, 25 kg of linear low-density polyethylene, 3.5 kg of the composite light stabilizer prepared in Preparation Example 1, 1 kg of tris(2, 4-di-tert-butylphenyl) phosphite, 1 kg of 4, 4'-methylenebis(2, 6-di-tert-butylphenol), 1.5 kg of polyvinyl alcohol and 1.5 kg of stearic acid are premixed in a high-speed mixer, and then melt-mixed in a twin-screw extruder.

[0052] Specific parameters are: Screw rotation speed: 400 rpm Feeding section: 200°C Compression section: 220°C Melting section: 230°C Venting section: 220°C Homogenizing section: 220°C Die / mold: 220°C Main machine torque: 50% Die pressure: 15 MPa S2, the extruded optical cable sheath material is rapidly cooled through a water cooling tank, and then further cooled by a air cooling device, the temperature of the cooling water is 25°C, and the air cooling speed is 5 m / s.

[0053] S3, the cooled optical cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.5.

[0054] S4, the shaped optical cable sheath material is cut or wound according to customer requirements.

[0055] Example 4 The embodiment discloses a high-density polyethylene composite material, and an optical cable sheath is made therefrom, which is prepared by the following steps: S1, 60 kg of high-density polyethylene, 25 kg of linear low-density polyethylene, 3.5 kg of the composite light stabilizer prepared in Preparation Example 7, 1 kg of tris(2, 4-di-tert-butylphenyl) phosphite, 1 kg of 4, 4'-methylenebis(2, 6-di-tert-butylphenol), 1.5 kg of polyvinyl alcohol and 1.5 kg of stearic acid are premixed in a high-speed mixer, and then melt-kneaded in a twin-screw extruder.

[0056] Specific parameters are: Screw rotation speed: 300 rpm Feeding section: 190°C Compression section: 210°C Melting section: 220°C Venting section: 210°C Homogenizing section: 210°C Die / mold: 210°C Main machine torque: 40% Die pressure: 12 MPa S2, the extruded optical cable sheath material is rapidly cooled through a water cooling tank, and then further cooled by a air cooling device, the temperature of the cooling water is 20°C, and the air cooling speed is 3 m / s.

[0057] S3, the cooled cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.3.

[0058] S4, the shaped cable sheath material is cut or wound according to customer requirements.

[0059] Example 5 The embodiment discloses a high-density polyethylene composite material and a cable sheath made of the material, which is prepared by the following steps: S1, 60 kg of high-density polyethylene, 25 kg of linear low-density polyethylene, 3.5 kg of the composite light stabilizer prepared in Preparation Example 1, 2 kg of tris(2, 4-di-tert-butylphenyl) phosphite, 1.5 kg of polyvinyl alcohol and 1.5 kg of stearic acid are premixed in a high-speed mixer, and then melt-mixed in a twin-screw extruder.

[0060] Specific parameters are as follows: Screw rotation speed: 300 rpm Feeding section: 190 DEG C Compression section: 210 DEG C Melt section: 220 DEG C Exhaust section: 210 DEG C Homogenization section: 210 DEG C Die / mold: 210 DEG C Main machine torque: 40% Die pressure: 12 MPa S2, the extruded cable sheath material is rapidly cooled by a water cooling tank, and then further cooled by an air cooling device, the temperature of the cooling water is 20 DEG C, and the air cooling speed is 3 m / s.

[0061] S3, the cooled cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.3.

[0062] S4, the shaped cable sheath material is cut or wound according to customer requirements.

[0063] Example 6 The embodiment discloses a high-density polyethylene composite material and a cable sheath made of the material, which is prepared by the following steps: S1, 60 kg of high-density polyethylene, 25 kg of linear low-density polyethylene, 3.5 kg of the composite light stabilizer prepared in Preparation Example 1, 2 kg of tris(2, 4-di-tert-butylphenyl) phosphite, 1.5 kg of polyvinyl alcohol and 1.5 kg of stearic acid are premixed in a high-speed mixer, and then melt-mixed in a twin-screw extruder.

[0064] Specific parameters are as follows: Screw rotation speed: 300 rpm Feed section: 190°C Compression section: 210°C Melt section: 220°C Vent section: 210°C Homogenization section: 210°C Die / mold: 210°C Main machine torque: 40% Die pressure: 12 MPa S2, the extruded optical cable sheath material is rapidly cooled through a water cooling tank, and then further cooled by a air cooling device, the temperature of the cooling water is 20°C, and the air cooling speed is 3 m / s.

[0065] S3, the cooled optical cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.3.

[0066] S4, the shaped optical cable sheath material is cut or wound according to customer requirements.

[0067] Example 7 The embodiment discloses a high-density polyethylene composite material, and an optical cable sheath is made by the following steps: S1, 60 kg of high-density polyethylene, 25 kg of linear low-density polyethylene, 3.5 kg of the composite light stabilizer prepared in Preparation Example 1, 2.5 kg of tris (2, 4-di-tert-butylphenyl) phosphite, and 2.5 kg of 4, 4'-methylenebis (2, 6-di-tert-butylphenol) are premixed in a high-speed mixer, and then melt-mixed in a twin-screw extruder.

[0068] Specific parameters are as follows: Screw rotation speed: 300 rpm Feed section: 190°C Compression section: 210°C Melt section: 220°C Vent section: 210°C Homogenization section: 210°C Die / mold: 210°C Main machine torque: 40% Die pressure: 12 MPa S2, the extruded optical cable sheath material is rapidly cooled through a water cooling tank, and then further cooled by a air cooling device, the temperature of the cooling water is 20°C, and the air cooling speed is 3 m / s.

[0069] S3, the cooled optical cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.3.

[0070] S4, cut or roll the shaped optical cable sheath material according to customer requirements.

[0071] Example 8 The present example discloses a high-density polyethylene composite material and an optical cable sheath made therefrom, which is prepared by the following steps: S1, 60 kg of high-density polyethylene, 25 kg of linear low-density polyethylene, 3.5 kg of the composite light stabilizer prepared in Preparation Example 1, and 5 kg of polyvinyl alcohol are first premixed in a high-speed mixer, and then fed into a twin-screw extruder for melt mixing.

[0072] The specific parameters are: Screw rotation speed: 300 rpm Feeding section: 190℃ Compression section: 210℃ Melt section: 220℃ Exhaust section: 210℃ Homogenization section: 210℃ Die / mold: 210℃ Main machine torque: 40% Die pressure: 12 MPa S2, the extruded optical cable sheath material is rapidly cooled through a water cooling tank, and then further cooled by a air cooling device, the cooling water temperature is 20℃, and the air cooling speed is 3m / s.

[0073] S3, the cooled optical cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.3.

[0074] S4, cut or roll the shaped optical cable sheath material according to customer requirements.

[0075] Example 9 The present example discloses a high-density polyethylene composite material and an optical cable sheath made therefrom, which is prepared by the following steps: S1, 60 kg of high-density polyethylene, 25 kg of linear low-density polyethylene, 3.5 kg of the composite light stabilizer prepared in Preparation Example 1, and 5 kg of polyvinyl alcohol are first premixed in a high-speed mixer, and then fed into a twin-screw extruder for melt mixing.

[0076] The specific parameters are: Screw rotation speed: 300 rpm Feeding section: 190℃ Compression section: 210℃ Melt section: 220℃ Exhaust section: 210℃ Homogenization section: 210℃ Die / mold: 210℃ Host torque: 40% Die pressure: 12 MPa S2, the extruded optical cable sheath material is rapidly cooled through a water cooling tank, and then further cooled by a air cooling device, the temperature of the cooling water is 20℃, and the air cooling speed is 3m / s.

[0077] S3, the cooled optical cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.3.

[0078] S4, the shaped optical cable sheath material is cut or wound according to customer requirements.

[0079] The following is a comparative example of preparing a high-density polyethylene composite material.

[0080] Comparative Example 1 This comparative example discloses a high-density polyethylene composite material, and an optical cable sheath is made therefrom, which is prepared by the following steps: S1, 60kg high-density polyethylene, 25kg linear low-density polyethylene, 3.5kg composite light stabilizer prepared in Preparation Example 2, 1kg tris(2, 4-di-tert-butylphenyl) phosphite, 1kg 4, 4'-methylenebis(2, 6-di-tert-butylphenol), 1.5kg polyvinyl alcohol and 1.5kg stearic acid are first premixed in a high-speed mixer, and then fed into a twin-screw extruder for melt mixing.

[0081] The specific parameters are: Screw speed: 300rpm Feeding section: 190℃ Compression section: 210℃ Melting section: 220℃ Exhaust section: 210℃ Homogenization section: 210℃ Die / mold: 210℃ Host torque: 40% Die pressure: 12 MPa S2, the extruded optical cable sheath material is rapidly cooled through a water cooling tank, and then further cooled by a air cooling device, the temperature of the cooling water is 20℃, and the air cooling speed is 3m / s.

[0082] S3, the cooled optical cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.3.

[0083] S4, the shaped optical cable sheath material is cut or wound according to customer requirements.

[0084] Comparative Example 2 This comparative example discloses a high-density polyethylene composite material and a cable sheath made therefrom, which is prepared by the following steps: S1, 60 kg of high-density polyethylene, 25 kg of linear low-density polyethylene, 3.5 kg of the composite light stabilizer prepared in Preparation Example 3, 1 kg of tris(2, 4-di-tert-butylphenyl) phosphite, 1 kg of 4, 4'-methylenebis(2, 6-di-tert-butylphenol), 1.5 kg of polyvinyl alcohol and 1.5 kg of stearic acid are first premixed in a high-speed mixer, and then fed into a twin-screw extruder for melt mixing.

[0085] The specific parameters are as follows: Screw rotation speed: 300 rpm Feeding section: 190°C Compression section: 210°C Melt section: 220°C Vent section: 210°C Homogenization section: 210°C Die / mold: 210°C Main machine torque: 40% Die pressure: 12 MPa S2, the extruded cable sheath material is rapidly cooled through a water cooling tank, and then further cooled by a air cooling device, the temperature of the cooling water is 20°C, and the air cooling speed is 3 m / s.

[0086] S3, the cooled cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.3.

[0087] S4, the shaped cable sheath material is cut or wound according to customer requirements.

[0088] Comparative Example 3 This comparative example discloses a high-density polyethylene composite material and a cable sheath made therefrom, which is prepared by the following steps: S1, 60 kg of high-density polyethylene, 25 kg of linear low-density polyethylene, 3.5 kg of the composite light stabilizer prepared in Preparation Example 4, 1 kg of tris(2, 4-di-tert-butylphenyl) phosphite, 1 kg of 4, 4'-methylenebis(2, 6-di-tert-butylphenol), 1.5 kg of polyvinyl alcohol and 1.5 kg of stearic acid are first premixed in a high-speed mixer, and then fed into a twin-screw extruder for melt mixing.

[0089] The specific parameters are as follows: Screw rotation speed: 300 rpm Feeding section: 190°C Compression section: 210°C Melt section: 220°C Vent section: 210°C Die head / mold: 210°C Die head / mold: 210°C Main machine torque: 40% Die head pressure: 12 MPa S2, the extruded optical cable sheath material is rapidly cooled through a water cooling tank, and then further cooled by a air cooling device, the temperature of the cooling water is 20°C, and the air cooling speed is 3 m / s.

[0090] S3, the cooled optical cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.3.

[0091] S4, the shaped optical cable sheath material is cut or wound according to customer requirements.

[0092] Comparative Example 4 The present comparative example discloses a high-density polyethylene composite material, and an optical cable sheath is made therefrom, which is prepared by the following steps: S1, 60 kg of high-density polyethylene, 25 kg of linear low-density polyethylene, 3.5 kg of the composite light stabilizer prepared in Preparation Example 5, 1 kg of tris(2, 4-di-tert-butylphenyl) phosphite, 1 kg of 4, 4'-methylenebis(2, 6-di-tert-butylphenol), 1.5 kg of polyvinyl alcohol and 1.5 kg of stearic acid are first premixed in a high-speed mixer, and then fed into a twin-screw extruder for melt mixing.

[0093] The specific parameters are: Screw rotation speed: 300 rpm Feeding section: 190°C Compression section: 210°C Melting section: 220°C Venting section: 210°C Homogenization section: 210°C Die head / mold: 210°C Main machine torque: 40% Die head pressure: 12 MPa S2, the extruded optical cable sheath material is rapidly cooled through a water cooling tank, and then further cooled by a air cooling device, the temperature of the cooling water is 20°C, and the air cooling speed is 3 m / s.

[0094] S3, the cooled optical cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.3.

[0095] S4, the shaped optical cable sheath material is cut or wound according to customer requirements.

[0096] Comparative Example 5 This comparative example discloses a high-density polyethylene composite material and a cable sheath made therefrom, which is prepared by the following steps: S1, 60 kg of high-density polyethylene, 25 kg of linear low-density polyethylene, 3.5 kg of the composite light stabilizer prepared in Preparation Example 6, 1 kg of tris(2, 4-di-tert-butylphenyl) phosphite, 1 kg of 4, 4'-methylenebis(2, 6-di-tert-butylphenol), 1.5 kg of polyvinyl alcohol and 1.5 kg of stearic acid are first premixed in a high-speed mixer, and then fed into a twin-screw extruder for melt mixing.

[0097] The specific parameters are as follows: Screw rotation speed: 300 rpm Feeding section: 190°C Compression section: 210°C Melt section: 220°C Exhaust section: 210°C Homogenization section: 210°C Die / mold: 210°C Main machine torque: 40% Die pressure: 12 MPa S2, the extruded cable sheath material is rapidly cooled through a water cooling tank, and then further cooled by a air cooling device, the temperature of the cooling water is 20°C, and the air cooling speed is 3 m / s.

[0098] S3, the cooled cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.3.

[0099] S4, the shaped cable sheath material is cut or wound according to customer requirements.

[0100] Comparative Example 6 This comparative example discloses a high-density polyethylene composite material and a cable sheath made therefrom, which is prepared by the following steps: S1, 60 kg of high-density polyethylene, 25 kg of linear low-density polyethylene, 3.5 kg of the composite light stabilizer prepared in Preparation Example 6, 1 kg of tris(2, 4-di-tert-butylphenyl) phosphite, 1 kg of 4, 4'-methylenebis(2, 6-di-tert-butylphenol), 1.5 kg of polyvinyl alcohol and 1.5 kg of stearic acid are first premixed in a high-speed mixer, and then fed into a twin-screw extruder for melt mixing.

[0101] The specific parameters are as follows: Screw rotation speed: 300 rpm Feeding section: 190°C Compression section: 210°C Melt section: 220°C Exhaust section: 210°C Homogenization section: 210°C Die / mandrel: 210°C Torque of main machine: 40% Die pressure: 12 MPa S2, the extruded optical cable sheath material is rapidly cooled through a water cooling tank, and then further cooled by a air cooling device, the temperature of the cooling water is 20°C, and the air cooling speed is 3 m / s.

[0102] S3, the cooled optical cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.3.

[0103] S4, the shaped optical cable sheath material is cut or wound according to customer requirements.

[0104] Comparative Example 7 The present comparative example discloses a high-density polyethylene composite material, and an optical cable sheath is made therefrom, which is prepared by the following steps: S1, 63.5 kg of high-density polyethylene, 25 kg of linear low-density polyethylene, 1 kg of tris(2, 4-di-tert-butylphenyl) phosphite, 1 kg of 4, 4'-methylenebis(2, 6-di-tert-butylphenol), 1.5 kg of polyvinyl alcohol and 1.5 kg of stearic acid are premixed in a high-speed mixer, and then fed into a twin-screw extruder for melt mixing.

[0105] The specific parameters are: Screw rotation speed: 300 rpm Feeding section: 190°C Compression section: 210°C Melting section: 220°C Exhaust section: 210°C Homogenization section: 210°C Die / mandrel: 210°C Torque of main machine: 40% Die pressure: 12 MPa S2, the extruded optical cable sheath material is rapidly cooled through a water cooling tank, and then further cooled by a air cooling device, the temperature of the cooling water is 20°C, and the air cooling speed is 3 m / s.

[0106] S3, the cooled optical cable sheath material is stretched and shaped by a traction machine, and the traction speed and the extrusion speed are controlled at 1:1.3.

[0107] S4, the shaped optical cable sheath material is cut or wound according to customer requirements.

[0108] Table 1 Raw material composition table (kg) of examples and comparative examples Test test data Aging resistance: Refer to GB / T 18950-2023 Rubber and plastics hoses Laboratory light source exposure test method Determination of changes in color, appearance and other physical properties, 5.1.1 Type 2 sample in Table 1; Prepare 6 samples from the material of the example or comparative example, and first take 3 of them to detect the tensile strength and elongation at break, and take the average value as the pre-aging data.

[0109] Then, the remaining 3 samples are aged, and the tensile strength and elongation at break are detected again, and the post-aging data is recorded.

[0110] Calculate the aging change rate (%): Change rate = (pre-aging detection value - post-aging detection value) / pre-aging detection value * 100%; Aging conditions 6.3, Method A in Table 4: artificial climate aging, humidity is 50±5%, exposure time is 1440 hours.

[0111] Elongation at break: tested according to GB / T 1040.3-2018, unit is %; Tensile strength: tested according to GB / T 1040.3-2018, unit is MPa.

[0112] Table 2 Example and comparative example test data table Comparing Comparative Example 2 and Comparative Examples 1-7 and combining the data in Table 2, it can be seen that after the light absorber is fixed with titanium dioxide, a black silica protective layer is generated on the surface of the titanium dioxide. The black silica protective layer can not only absorb ultraviolet rays, but also protect the light absorber during the processing of the optical cable sheath, reducing the damage to the light absorber during processing, thereby improving the effect of the light absorber, and through the dispersion of the black silica dioxide in the raw material, the light absorber is uniformly dispersed, so that the light absorber can better capture active free radicals, improve the overall stability, and because the black silica forms a non-dense protective layer, the ultraviolet rays passing through the black silica will also be absorbed by a part of the titanium dioxide, thereby further eliminating the adverse effects of ultraviolet irradiation on the optical cable sheath.

[0113] Comparing Comparative Example 2 and Example 5 and combining Table 2, it can be seen that the surface of the composite light stabilizer is treated with a silane coupling agent, thereby improving the compatibility of the composite light stabilizer in the high-density polyethylene composite material, and thereby improving the overall performance of the high-density polyethylene composite material.

[0114] As can be seen from Comparative Example 2, Example 5 and Example 6 in combination with Table 2, the addition of two antioxidants, 4,4'-methylenebis(2,6-di-tert-butylphenol) as the main antioxidant and tris(2,4-di-tert-butylphenyl) phosphite as the auxiliary antioxidant, effectively exerts the synergistic effect of both, improves the effect of the antioxidant, and further effectively improves the performance of the high-density polyethylene composite material.

[0115] As can be seen from Comparative Example 2, Example 7, Example 8 and Example 9 in combination with Table 2, the appropriate addition of the antioxidant, the lubricant and the dispersant can effectively improve the performance of the high-density polyethylene composite material.

[0116] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so: any equivalent changes made in the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A high-density polyethylene composite material, characterized in that, The raw materials include the following parts by weight: 50-70 parts of high-density polyethylene, 20-30 parts of linear low-density polyethylene, 2-5 parts of composite light stabilizer, and 3-7 parts of additives. The composite light stabilizer is light absorber modified titanium dioxide supported on black silica particles.

2. The high-density polyethylene composite material according to claim 1, characterized in that, The composite light stabilizer is prepared by the following steps: S1. Urea, tetrabutyl titanate and light absorber were added to anhydrous ethanol in sequence and dissolved. The mixture was then heated to 100°C and reacted for 48 hours. The product was then washed with distilled water and ethanol, and dried to obtain light absorber modified porous titanium dioxide. S2. Add carbon black particles to deionized water and sonicate to disperse the carbon black particles evenly in the deionized water. Add tetraethyl orthosilicate and then add a 25% ammonia solution by volume. Stir and mix for 30 minutes. Then, the light absorber modified porous titanium dioxide prepared in S1 was added, and the mixture was stirred at room temperature for 12 hours. After adding anhydrous ethanol, the mixture was centrifuged and washed repeatedly. The composite light stabilizer was then obtained by freeze drying.

3. The high-density polyethylene composite material according to claim 1, characterized in that, The composite light stabilizer is then surface-treated using a coupling agent after preparation.

4. The high-density polyethylene composite material according to claim 1, characterized in that, The surface treatment of the coupling agent includes the following operations: adding the composite light stabilizer and silane coupling agent to anhydrous ethanol in a weight ratio of 1:5:10, reacting at 50°C for 6 hours, centrifuging, and then drying to complete the surface treatment.

5. The high-density polyethylene composite material according to claim 1, characterized in that, The additives include antioxidants, lubricants and dispersants, and the weight ratio of the antioxidants, lubricants and dispersants is (1-3):(1-2):(1-2).

6. The high-density polyethylene composite material according to claim 1, characterized in that, The antioxidant comprises tris(2,4-di-tert-butylphenyl) phosphite and 4,4'-methylenebis(2,6-di-tert-butylphenol) in a weight ratio of 1:

2.

7. A method for preparing a high-density polyethylene composite material according to any one of claims 1-6, characterized in that, Includes the following steps: S1. High-density polyethylene, linear low-density polyethylene, composite light stabilizer, antioxidant, lubricant and dispersant are premixed in a high-speed mixer in a certain proportion, and then fed into a twin-screw extruder for melt mixing. S2. The extruded optical cable sheath material is rapidly cooled through a water cooling tank, and then further cooled using an air cooling device. S3. The cooled optical cable sheath material is stretched and shaped by a traction machine, and the traction speed and extrusion speed are controlled at 1:1-1:1.

5. S4. Cut or roll up the shaped optical cable sheath material according to customer requirements.

8. The method for preparing a high-density polyethylene composite material according to claim 7, characterized in that, The parameters in S1 are, Screw speed: 200-400 rpm Feeding section: 180-200℃ Compression section: 200-220℃ Melting zone: 210-230℃ Exhaust section: 200-220℃ Homogenization section: 200-220℃, Machine head / mold: 200-220℃ Main unit torque: 30-50%, Head pressure: 8-15MPa.

9. The method for preparing a high-density polyethylene composite material according to claim 7, characterized in that, The temperature of the cooling water in S2 is 15-25℃, and the air velocity for air cooling is 2-5m / s.

10. An optical cable sheath, characterized in that: It is made from the high-density polyethylene composite material as described in any one of claims 1-6.

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