Preparation method of FRP optical cable reinforced core and FRP optical cable

Abstract

The invention relates to the technical field of FRP optical cables, and discloses a preparation method of an FRP optical cable reinforced core and an FRP optical cable, and the preparation method comprises the following steps: preparing reinforced fibers, polyurethane resin, a curing agent, a plasticizer, a filler, an antioxidant and an ultraviolet light absorber; the reinforced fibers are plied to be made into yarn, and the yarn sequentially penetrates through a line concentration plate, an injection box, a mold and a traction roller; the polyurethane resin, the curing agent, the plasticizer, the filler, the antioxidant and the ultraviolet light absorber are poured into an injection machine according to the proportion to be stirred and mixed, and a premix is obtained; injecting the uniformly mixed premix into a mold for molding to obtain a blank; carrying out curing treatment on the blank in the mold; demolding treatment; naturally cooling the cured blank to room temperature, and performing demolding treatment to obtain the FRP optical cable reinforced core; according to the invention, polyurethane resin is adopted as a base material to manufacture the FRP optical cable reinforced core, so that the FRP optical cable reinforced core has the advantages of high strength, high flexibility and good weather resistance.

Description

Technical Field

[0001] The invention relates to a preparation method of an FRP optical cable reinforcement core and an FRP optical cable, belonging to the technical field of FRP optical cables. Background Art

[0002] HDMI is a digital interface standard widely used for high-speed data transmission between audio and video devices. HDMI wired transmission technology can achieve simultaneous transmission of high-definition video, multi-channel audio and data signals through a single cable, greatly simplifying the connection between devices. HDMI wired transmission technology has become the mainstream standard for connecting modern audio and video devices with its high-definition, multi-channel audio and high-bandwidth data transmission capabilities. Whether in home theater, gaming entertainment or medical endoscopy applications, HDMI provides a convenient and efficient solution.

[0003] At present, most cables used in HDMI are FRP optical cables, which are optical cables that combine optical fiber technology with fiber-reinforced plastic materials. Compared with traditional optical cables, FRP optical cables have obvious advantages in corrosion resistance, tensile strength and ease of installation. At present, most common FRP optical cables use vinyl resin as the base material to make the reinforcing core of the optical cable. For example, the invention patent application with Chinese patent application number CN201310224451.9 discloses a method for preparing an indoor optical cable reinforcing core, which is to prepare the optical cable reinforcing core by using vinyl resin. Another example is the invention patent application with Chinese patent application number CN201510580968.0, which discloses an optical cable reinforcing core material, which is also prepared by using vinyl resin. Although the optical cable reinforcing core made of vinyl resin has high chemical corrosion resistance, it has the following problems: 1. Poor flexibility: Vinyl resin has low flexibility and is prone to breakage when bent or stretched. It is not suitable for scenarios that require frequent movement or complex wiring.

[0004] 2. Poor low-temperature performance: Vinyl resin tends to become brittle in low-temperature environments, which causes its performance to decline and affects normal use. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a method for preparing a FRP optical cable reinforcement core and a FRP optical cable.

[0006] The technical solution of the present invention is as follows: In a first aspect, the present invention provides a method for preparing a FRP optical cable reinforcement core, comprising the following steps: Step 1: Material preparation; prepare reinforcing fiber, polyurethane resin, curing agent, plasticizer, filler, antioxidant and ultraviolet absorber. The curing agent can be polyisocyanate curing agent, the plasticizer can be dioctyl phthalate, the filler can be calcium carbonate or talcum powder, the antioxidant can be antioxidant 1010, and the ultraviolet absorber can be UV-531. The curing agent is used to initiate the cross-linking reaction of the polyurethane resin system, so that the liquid resin is converted into a solid network structure for the subsequent reaction. The plasticizer can reduce the glass transition temperature of the polyurethane resin system, making the subsequent material softer and more elastic. The filler can improve the strength, hardness and wear resistance of the subsequent material. The antioxidant can prevent the subsequent material from degrading under high temperature or oxidative environment by capturing free radicals. The ultraviolet absorber helps to maintain the mechanical stability of the subsequent material.

[0007] Step 2: Make yarn; Ply the reinforcing fibers into yarn. The reinforcing fibers can be glass fibers or aramid fibers. The diameter of the reinforcing fibers is selected according to actual requirements. Then the yarn is passed through the wire collecting plate, injection box, mold and traction roller in sequence. The injection box is connected to the mold. When the traction roller starts working, it can continuously pull the yarn for subsequent use.

[0008] Step 3: Stirring and mixing; pour the polyurethane resin, curing agent, plasticizer, filler, antioxidant, and ultraviolet absorber into the injection machine according to the proportion and stir and mix them. The stirring speed is 800-1200rpm and the stirring time is 15-30min to obtain a premix. The proportion of polyurethane resin, curing agent, plasticizer, filler, antioxidant, and ultraviolet absorber is calculated by mass fraction: polyurethane resin 55-80%, curing agent 10-20%, plasticizer 5-15%, filler 5-15%, antioxidant 0.5-1%, and ultraviolet absorber 0.5-1%.

[0009] Step 4: injection molding; inject the uniformly mixed premix into the injection box to inject into the mold, and the premix is ​​molded in the mold to obtain a blank; during the injection molding process, the injection temperature is 80-120°C, the injection pressure is 50-100MPa, and the holding time is 5-10min.

[0010] Step 5: Curing treatment: Curing treatment is performed on the blank in the mold, specifically, the mold is heated to cure the blank, the curing temperature is 120-150°C, and the curing time is 2-4 hours.

[0011] Step 6: demoulding: After the solidified blank is naturally cooled to room temperature, demoulding is performed to obtain the FRP optical cable reinforcement core. To facilitate the demoulding process, a release agent can be applied on the inner surface of the mold in advance.

[0012] The FRP optical cable reinforcement core made by the above method has the characteristics of high strength, high flexibility and good weather resistance compared with the traditional optical cable reinforcement core made of vinyl resin. At the same time, the process adopts a closed infiltration method, that is, injection molding and curing are completed in the closed environment of the mold, which will not exchange with external substances and will not come into contact with the human body, and has the advantages of good product quality and high safety. The polyurethane resin in the first step of the above steps can be prepared by using conventional polyurethane resins, such as polyether polyols and diisocyanates. Although the polyurethane resin has good flexibility and low temperature resistance, its heat resistance and mechanical strength may not meet the requirements in certain extreme environments. Therefore, the polyurethane resin used in the first step of the above steps can also be prepared by the following steps: Step 1: Raw material preparation: prepare polyester polyol, naphthalene-1,5-diisocyanate, catalyst and chain extender; the catalyst can be an organic tin catalyst, such as dibutyltin dilaurate, and the chain extender can be 1,4-butanediol. The catalyst is used to catalyze the subsequent reaction, and the chain extender is used to carry out the subsequent chain extension reaction.

[0013] Step 2: Premixing: Add polyester polyol and catalyst in the reaction kettle according to the proportion, heat and stir, and slowly add naphthalene-1,5-diisocyanate during stirring to react. In this reaction, the reaction temperature is 60-70°C, the stirring speed is 200-300rpm, and the reaction time is 30-90min. The proportion of polyester polyol, naphthalene-1,5-diisocyanate and catalyst is calculated by mass fraction: polyester polyol 50-60%, naphthalene-1,5-diisocyanate 30-40%, catalyst 0.1-0.3%.

[0014] Step 3: Chain extension reaction; after the above steps are completed, continue to add chain extender into the reactor, the ratio of chain extender is calculated by mass fraction: chain extender 5-10%, and continue to stir the reaction. In this reaction, the reaction temperature is 60-70°C, the stirring speed is 200-300rpm, and the reaction time is 1-2h.

[0015] Step 4: Cooling and discharging: After the reaction in the above steps is completed, the obtained material is cooled at a temperature of 40-50°C, and after cooling, the material is poured out of the reactor for standby use. At this point, the desired polyurethane resin can be obtained.

[0016] The polyurethane resin prepared by the above method has the advantages of higher mechanical strength, higher heat resistance and higher wear resistance compared with traditional polyurethane resin. By using the polyurethane resin prepared by the above method to prepare FRP optical cable reinforcement core, the product quality can be further improved.

[0017] In a second aspect, the present invention provides an FRP optical cable, comprising an FRP optical cable reinforcement core prepared using the above-mentioned method for preparing an FRP optical cable reinforcement core, a polyethylene inner sheath and a polyethylene outer sheath are sequentially arranged on the outside of the FRP optical cable reinforcement core from the inside to the outside, an aramid fiber is also arranged between the polyethylene inner sheath and the polyethylene outer sheath, an optical fiber bundle distributed in a ring shape with the center line of the FRP optical cable reinforcement core as the center of the array is also arranged between the FPR optical cable reinforcement core and the polyethylene inner sheath, and a cable core filler is also filled between the FPR optical cable reinforcement core and the polyethylene inner sheath.

[0018] The present invention has the following beneficial effects: 1. The present invention provides a method for preparing an FRP optical cable reinforcement core. By proposing to use polyurethane resin as a matrix material to make the FRP optical cable reinforcement core, compared with the traditional FRP optical cable reinforcement core made of vinyl resin as a matrix material, the FRP optical cable reinforcement core has the characteristics of high strength, high flexibility and good weather resistance. At the same time, the process adopts a closed infiltration method, that is, injection molding and curing are completed in a closed environment such as a mold, and there will be no exchange with external substances and contact with the human body, which has the advantages of good product quality and high safety.

[0019] 2. The present invention prepares polyurethane resin by using polyester polyol and naphthalene-1,5-diisocyanate. Compared with traditional polyurethane resin, it has the advantages of higher mechanical strength, higher heat resistance and higher wear resistance. The polyurethane resin prepared by this method is used to prepare FRP optical cable reinforcement core, which can further improve product quality.

[0020] 3. The present invention provides an FRP optical cable, which has the advantages of superior mechanical properties, excellent environmental resistance and good flexibility compared to traditional FRP optical cables by using an FRP optical cable reinforcement core made of polyurethane resin as a matrix material. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the cross-sectional structure of an FPR optical cable in the present invention.

[0022] The reference numerals in the figure are as follows: 1. FRP optical cable reinforcement core; 2. Polyethylene inner sheath; 3. Polyethylene outer sheath; 4. Aramid fiber; 5. Optical fiber harness; 6. Cable core filler. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Embodiment 1: This embodiment provides a method for preparing a polyurethane resin, comprising the following steps: Step 1: Raw material preparation: prepare polyester polyol, naphthalene-1,5-diisocyanate, catalyst and chain extender; the catalyst can be an organic tin catalyst, such as dibutyltin dilaurate, and the chain extender can be 1,4-butanediol. The catalyst is used to catalyze the subsequent reaction, and the chain extender is used to carry out the subsequent chain extension reaction.

[0025] Step 2: Premixing: Add polyester polyol and catalyst in a reaction kettle according to the proportion, heat and stir, and slowly add naphthalene-1,5-diisocyanate during stirring to react. In this reaction, the reaction temperature is 60°C, the stirring speed is 200rpm, and the reaction time is 90min. The proportion of polyester polyol, naphthalene-1,5-diisocyanate and catalyst is calculated by mass fraction: 50% polyester polyol, 40% naphthalene-1,5-diisocyanate, and 0.3% catalyst.

[0026] Step 3: Chain extension reaction; after the above steps are completed, the chain extender is added to the reactor in a ratio of 9.7% by mass, and the stirring reaction is continued. In this reaction, the reaction temperature is 60°C, the stirring speed is 200rpm, and the reaction time is 2h.

[0027] Step 4: Cooling and discharging: After the reaction in the above steps is completed, the obtained material is cooled at a temperature of 50°C, and after cooling, the material is poured out of the reactor for standby use. At this point, the desired polyurethane resin can be obtained.

[0028] Embodiment 2: This embodiment provides a method for preparing a polyurethane resin, comprising the following steps: Step 1: Raw material preparation: prepare polyester polyol, naphthalene-1,5-diisocyanate, catalyst and chain extender; the catalyst can be an organic tin catalyst, such as dibutyltin dilaurate, and the chain extender can be 1,4-butanediol. The catalyst is used to catalyze the subsequent reaction, and the chain extender is used to carry out the subsequent chain extension reaction.

[0029] Step 2: Premixing: Add polyester polyol and catalyst in a reaction kettle according to the proportion, heat and stir, and slowly add naphthalene-1,5-diisocyanate during stirring to react. In this reaction, the reaction temperature is 70°C, the stirring speed is 300rpm, and the reaction time is 30min. The proportion of polyester polyol, naphthalene-1,5-diisocyanate and catalyst is calculated by mass fraction: polyester polyol 60%, naphthalene-1,5-diisocyanate 30%, and catalyst 0.1%.

[0030] Step 3: Chain extension reaction; after the above steps are completed, the chain extender is added to the reactor in a ratio of 9.9% by mass, and the stirring reaction is continued. In this reaction, the reaction temperature is 70°C, the stirring speed is 300rpm, and the reaction time is 1h.

[0031] Step 4: Cooling and discharging: After the reaction in the above steps is completed, the obtained material is cooled at a temperature of 40°C, and after cooling, the material is poured out of the reactor for standby use. At this point, the desired polyurethane resin can be obtained.

[0032] Embodiment 3: This embodiment provides a method for preparing a polyurethane resin, comprising the following steps: Step 1: Raw material preparation: prepare polyester polyol, naphthalene-1,5-diisocyanate, catalyst and chain extender; the catalyst can be an organic tin catalyst, such as dibutyltin dilaurate, and the chain extender can be 1,4-butanediol. The catalyst is used to catalyze the subsequent reaction, and the chain extender is used to carry out the subsequent chain extension reaction.

[0033] Step 2: Premixing: Add polyester polyol and catalyst in the reaction kettle according to the proportion, heat and stir, and slowly add naphthalene-1,5-diisocyanate during stirring to react. In this reaction, the reaction temperature is 65°C, the stirring speed is 250rpm, and the reaction time is 60min. The proportion of polyester polyol, naphthalene-1,5-diisocyanate and catalyst is calculated by mass fraction: polyester polyol 55%, naphthalene-1,5-diisocyanate 39.5%, catalyst 0.2%.

[0034] Step 3: Chain extension reaction; after the above steps are completed, the chain extender is added to the reactor in a ratio of 5.3% by mass, and the stirring reaction is continued. In this reaction, the reaction temperature is 65°C, the stirring speed is 250rpm, and the reaction time is 1.5h.

[0035] Step 4: Cooling and discharging: After the reaction in the above steps is completed, the obtained material is cooled at a temperature of 45°C, and after cooling, the material is poured out of the reactor for standby use. At this point, the desired polyurethane resin can be obtained.

[0036] The polyurethane resins prepared in Example 1, Example 2 and Example 3 and the conventional polyurethane resin synthesized from polyether polyol and diisocyanate were tested for tensile strength, elongation at break, hardness, heat resistance and wear resistance, and the results are shown in Table 1.

[0037] Table 1

[0038] Result analysis: Tensile strength: The tensile strength of the polyurethane resins obtained in Examples 1 to 3 is higher, indicating that they have better bearing capacity and mechanical strength.

[0039] Elongation at break: Although the elongation at break of the polyurethane resins obtained in Examples 1 to 3 is slightly lower than that of the traditional polyurethane, it is still very close and still has good elasticity.

[0040] Hardness: The polyurethane resins obtained in Examples 1 to 3 have a higher hardness and are suitable for applications requiring higher rigidity.

[0041] Heat resistance: The polyurethane resins obtained in Examples 1 to 3 have better heat resistance than traditional polyurethanes and can be used in high temperature environments.

[0042] Wear resistance: The wear resistance of the polyurethane resins obtained in Examples 1 to 3 is better than that of conventional polyurethanes, indicating that they have advantages in wear-resistant applications.

[0043] Embodiment 4: This embodiment provides a method for preparing a FRP optical cable reinforcement core, comprising the following steps: Step 1: Material preparation; prepare reinforcing fiber, polyurethane resin, curing agent, plasticizer, filler, antioxidant and ultraviolet absorber. The polyurethane resin is selected from the polyurethane resin prepared by the preparation method provided in Example 1. The curing agent can be a polyisocyanate curing agent, the plasticizer can be dioctyl phthalate, the filler can be calcium carbonate or talcum powder, the antioxidant can be antioxidant 1010, and the ultraviolet absorber can be UV-531.

[0044] Step 2: Make yarn; Ply the reinforcing fibers into yarn. The reinforcing fibers can be glass fibers or aramid fibers. The diameter of the reinforcing fibers is selected according to actual requirements. Then the yarn is passed through the wire collecting plate, injection box, mold and traction roller in sequence. The injection box is connected to the mold. When the traction roller starts working, it can continuously pull the yarn for subsequent use.

[0045] Step 3: Stirring and mixing; pour the polyurethane resin, curing agent, plasticizer, filler, antioxidant, and ultraviolet absorber into the injection machine according to the proportion and stir and mix them. The stirring speed is 800rpm and the stirring time is 30min to obtain a premix. The proportion of polyurethane resin, curing agent, plasticizer, filler, antioxidant, and ultraviolet absorber is calculated by mass fraction: polyurethane resin 55%, curing agent 20%, plasticizer 15%, filler 9%, antioxidant 0.5%, and ultraviolet absorber 0.5%.

[0046] Step 4: injection molding; the uniformly mixed premix is ​​injected into the injection box to be injected into the mold, and the premix is ​​molded in the mold to obtain a blank; during the injection molding process, the injection temperature is 80° C., the injection pressure is 50 MPa, and the holding time is 10 min.

[0047] Step 5: Curing treatment: Curing treatment is performed on the blank in the mold, specifically, the mold is heated to cure the blank, the curing temperature is 150°C, and the curing time is 2 hours.

[0048] Step 6: demoulding: After the solidified blank is naturally cooled to room temperature, demoulding is performed to obtain the FRP optical cable reinforcement core. To facilitate the demoulding process, a release agent can be applied on the inner surface of the mold in advance.

[0049] Embodiment 5: This embodiment provides a method for preparing a FRP optical cable reinforcement core, comprising the following steps: Step 1: Material preparation; prepare reinforcing fiber, polyurethane resin, curing agent, plasticizer, filler, antioxidant and ultraviolet absorber. The polyurethane resin is selected from the polyurethane resin prepared by the preparation method provided in Example 2. The curing agent can be a polyisocyanate curing agent, the plasticizer can be dioctyl phthalate, the filler can be calcium carbonate or talcum powder, the antioxidant can be antioxidant 1010, and the ultraviolet absorber can be UV-531.

[0050] Step 2: Make yarn; Ply the reinforcing fibers into yarn. The reinforcing fibers can be glass fibers or aramid fibers. The diameter of the reinforcing fibers is selected according to actual requirements. Then the yarn is passed through the wire collecting plate, injection box, mold and traction roller in sequence. The injection box is connected to the mold. When the traction roller starts working, it can continuously pull the yarn for subsequent use.

[0051] Step 3: Stirring and mixing; pour the polyurethane resin, curing agent, plasticizer, filler, antioxidant, and ultraviolet absorber into the injection machine according to the proportion and stir and mix them. The stirring speed is 1200rpm and the stirring time is 15min to obtain a premix. The proportion of polyurethane resin, curing agent, plasticizer, filler, antioxidant, and ultraviolet absorber is calculated by mass fraction: polyurethane resin 60%, curing agent 15%, plasticizer 10.9%, filler 14.9%, antioxidant 0.1%, and ultraviolet absorber 0.1%.

[0052] Step 4: injection molding; the uniformly mixed premix is ​​injected into the injection box to be injected into the mold, and the premix is ​​molded in the mold to obtain a blank; during the injection molding process, the injection temperature is 80° C., the injection pressure is 100 MPa, and the holding time is 5 minutes.

[0053] Step 5: Curing treatment: Curing treatment is performed on the blank in the mold, specifically, the mold is heated to cure the blank, the curing temperature is 120°C, and the curing time is 4 hours.

[0054] Step 6: demoulding: After the solidified blank is naturally cooled to room temperature, demoulding is performed to obtain the FRP optical cable reinforcement core. To facilitate the demoulding process, a release agent can be applied on the inner surface of the mold in advance.

[0055] Embodiment 6: This embodiment provides a method for preparing a FRP optical cable reinforcement core, comprising the following steps: Step 1: Material preparation; prepare reinforcing fiber, polyurethane resin, curing agent, plasticizer, filler, antioxidant and ultraviolet absorber. The polyurethane resin is selected from the polyurethane resin prepared by the preparation method provided in Example 3. The curing agent can be a polyisocyanate curing agent, the plasticizer can be dioctyl phthalate, the filler can be calcium carbonate or talcum powder, the antioxidant can be antioxidant 1010, and the ultraviolet absorber can be UV-531.

[0056] Step 2: Make yarn; Ply the reinforcing fibers into yarn. The reinforcing fibers can be glass fibers or aramid fibers. The diameter of the reinforcing fibers is selected according to actual requirements. Then the yarn is passed through the wire collecting plate, injection box, mold and traction roller in sequence. The injection box is connected to the mold. When the traction roller starts working, it can continuously pull the yarn for subsequent use.

[0057] Step 3: Stirring and mixing; pour the polyurethane resin, curing agent, plasticizer, filler, antioxidant, and ultraviolet absorber into the injection machine according to the proportion and stir and mix them. The stirring speed is 1000rpm and the stirring time is 25min to obtain a premix. The proportion of polyurethane resin, curing agent, plasticizer, filler, antioxidant, and ultraviolet absorber is calculated by mass fraction: polyurethane resin 79%, curing agent 10%, plasticizer 5.5%, filler 5%, antioxidant 0.3%, and ultraviolet absorber 0.2%.

[0058] Step 4: injection molding; the uniformly mixed premix is ​​injected into the injection box to be injected into the mold, and the premix is ​​molded in the mold to obtain a blank; during the injection molding process, the injection temperature is 100° C., the injection pressure is 80 MPa, and the holding time is 8 minutes.

[0059] Step 5: Curing treatment: Curing treatment is performed on the blank in the mold, specifically, the mold is heated to cure the blank, the curing temperature is 130°C, and the curing time is 3 hours.

[0060] Step 6: demoulding: After the solidified blank is naturally cooled to room temperature, demoulding is performed to obtain the FRP optical cable reinforcement core. To facilitate the demoulding process, a release agent can be applied on the inner surface of the mold in advance.

[0061] The FRP optical cable reinforcement cores prepared in Example 4, Example 5, and Example 6 were tested for tensile strength, flexibility, high temperature resistance, chemical corrosion resistance, and wear resistance along with traditional vinyl resin optical cable reinforcement cores, metal reinforcement cores, and glass fiber reinforcement cores, and the results are shown in Table 2.

[0062] Table 2

[0063] Result analysis: Tensile strength: The FRP optical cable reinforcement cores obtained in Examples 4 to 6 have higher tensile strength than the traditional vinyl resin optical cable reinforcement cores, indicating that they have better load-bearing capacity and mechanical strength.

[0064] Flexibility: The FRP optical cable reinforcement core obtained in Examples 4 to 6 has a smaller bending radius and better flexibility than the traditional vinyl resin optical cable reinforcement core.

[0065] High temperature resistance: The FRP optical cable reinforcement core obtained in Examples 4 to 6 can withstand higher temperatures than the traditional vinyl resin optical cable reinforcement core and can be used in high temperature environments.

[0066] Chemical corrosion resistance and wear resistance: The FRP optical cable reinforcement core obtained in Examples 4 to 6 has higher chemical corrosion resistance and wear resistance than the traditional vinyl resin optical cable reinforcement core, and can be used in harsh environments.

[0067] Compared with the traditional metal reinforcement core and glass fiber reinforcement core, the FRP optical cable reinforcement core obtained in Examples 4 to 6 is more suitable as an indoor communication optical cable, such as being used in a medical endoscope system, and has the advantages of high strength, high flexibility, and good weather resistance.

[0068] Example 7: Please refer to Figure 1This embodiment provides an FRP optical cable, including an FRP optical cable reinforcement core 1 prepared by the method for preparing an FRP optical cable reinforcement core 1 provided by any one of the fourth, fifth or sixth embodiments, and a polyethylene inner sheath 2 and a polyethylene outer sheath 3 are sequentially arranged on the outside of the FRP optical cable reinforcement core 1 from the inside to the outside, and the arrangement of the polyethylene inner sheath 2 and the polyethylene outer sheath 3 plays the required protective role to prevent the optical fiber bundle 5 therein from being damaged, and aramid fiber 4 is also arranged between the polyethylene inner sheath 2 and the polyethylene outer sheath 3, and the arrangement of the aramid fiber 4 is used to provide additional mechanical protection and tensile strength. An optical fiber bundle 5 is also arranged between the FPR optical cable reinforcement core and the polyethylene inner sheath 2, and the optical fiber bundle 5 is distributed in a ring shape with the center line of the FRP optical cable reinforcement core 1 as the center of the array, and a cable core filler 6 is also filled between the FPR optical cable reinforcement core and the polyethylene inner sheath 2, and the cable core filler 6 is used to strengthen the overall structural strength of the FRP optical cable.

[0069] Through the above-mentioned settings, the FRP optical cable provided in this embodiment uses an FRP optical cable reinforcement core 1 made of polyurethane resin as a matrix material. Compared with the traditional FRP optical cable, the FRP optical cable reinforcement core 1 used has the advantages of high strength, high flexibility and good weather resistance. Therefore, the FRP optical cable provided in this embodiment has the advantages of superior mechanical properties, excellent environmental resistance and good flexibility.

[0070] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing a FRP optical cable reinforcement core, characterized in that: The following steps are involved: Step A1: Material preparation; Prepare reinforcing fibers, polyurethane resin, curing agent, plasticizer, filler, antioxidant and ultraviolet absorber; Step A2: Make yarn; Ply the reinforcing fibers into yarn, and pass the yarn through the collection plate, injection box, mold and traction roller in sequence; Step A3: Stir and mix; Pour the polyurethane resin, curing agent, plasticizer, filler, antioxidant and ultraviolet absorber into the injection machine according to the proportion and stir and mix to obtain a premix; Step A4: Injection molding; Inject the uniformly mixed premix into the mold for molding to obtain a blank; Step A5: Curing treatment; Curing treatment is performed on the blank in the mold; Step A6: Demolding treatment; The solidified blank is naturally cooled to room temperature and then demolded to obtain an FRP optical cable reinforcement core.

2. The method for preparing a FRP optical cable reinforcement core according to claim 1, characterized in that: In step A3, the ratio of polyurethane resin, curing agent, plasticizer, filler, antioxidant and ultraviolet absorber is as follows by mass fraction: polyurethane resin 55-80%, curing agent 10-20%, plasticizer 5-15%, filler 5-15%, antioxidant 0.5-1%, ultraviolet absorber 0.5-1%.

3. The method for preparing a FRP optical cable reinforcement core according to claim 1, characterized in that: In step A3, the stirring speed is 800-1200 rpm, and the stirring time is 15-30 min.

4. The method for preparing a FRP optical cable reinforcement core according to claim 1, characterized in that: In step A4, the injection molding temperature is 80-120° C., the injection molding pressure is 50-100 MPa, and the holding time is 5-10 min.

5. The method for preparing a FRP optical cable reinforcement core according to claim 1, characterized in that: In the step A5, the curing temperature is 120-150° C. and the curing time is 2-4 hours.

6. The method for preparing a FRP optical cable reinforcement core according to claim 1, characterized in that: In step A1, the polyurethane resin is prepared by the following steps: Step B1: raw material preparation: preparing polyester polyol, naphthalene-1,5-diisocyanate, catalyst and chain extender; Step B2: premixing; adding polyester polyol and catalyst in a ratio into a reaction kettle, heating and stirring, and slowly adding naphthalene-1,5-diisocyanate during stirring to react; Step B3: chain extension reaction; after the reaction in step B2 is completed, continue to add the chain extender to the reactor and continue to stir the reaction; Step B4: Cooling and discharging: After the reaction in step B3 is completed, the material is cooled and poured out of the reactor for standby use.

7. The method for preparing a FRP optical cable reinforcement core according to claim 6, characterized in that: In the step B2, the polyester polyol, naphthalene-1,5-diisocyanate and catalyst are mixed in the following proportions by mass: 50-60% polyester polyol, 30-40% naphthalene-1,5-diisocyanate and 0.1-0.3% catalyst.

8. The method for preparing a FRP optical cable reinforcement core according to claim 6, characterized in that: The reaction temperature of step B2 and step B3 is 60-70° C., the stirring speed is 200-300 rpm, the reaction time in step B2 is 30-90 min, the reaction time in step B3 is 1-2 h, and the ratio of the chain extender in step B3 is 5-10% by mass fraction.

9. The method for preparing a FRP optical cable reinforcement core according to claim 8, characterized in that: The cooling temperature in step B4 is 40-50°C.

10. An FRP optical cable, characterized in that: The invention comprises an FRP optical cable reinforcing core (1) prepared by using a method for preparing an FRP optical cable reinforcing core (1) as claimed in any one of claims 1 to 9, wherein a polyethylene inner sheath (2) and a polyethylene outer sheath (3) are arranged on the outside of the FRP optical cable reinforcing core (1) in sequence from the inside to the outside, and aramid fibers (4) are arranged between the polyethylene inner sheath (2) and the polyethylene outer sheath (3), and an optical fiber bundle (5) distributed in a ring shape and filled with a cable core filler (6) are arranged between the FPR optical cable reinforcing core and the polyethylene inner sheath (2).

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