Reinforcing material, method for producing the same and use thereof

Abstract

This invention relates to the technical field of hoses, and more particularly to a reinforcing material, its preparation method, and its application. The material composition includes at least one thermoplastic polyolefin, 80-120 parts by weight of the thermoplastic polyolefin, 15-20 parts by weight of fiber, and grafted material. The screw compression section and mixing section of the mixture are equipped with pins, and the screw as a whole is provided with helical grooves. This invention first discovered the relationship between the fiber content in the reinforcing material composition with a fiber-reinforced phase and the bending radius and strength of the hose product. Furthermore, by appropriately increasing the fiber content and optimizing the preparation method, the hose product with the reinforced structure achieves higher strength, while simultaneously maintaining its bending radius near the minimum level, providing an effective material formulation and preparation method for reinforced hose products.

Description

Technical Field

[0001] This invention relates to the technical field of hoses, and in particular to a reinforcing material, its preparation method, and its application. Background Technology

[0002] A hose is a flexible tubular product, usually made of rubber, plastic, metal or composite materials. It is flexible and can adapt to complex spatial orientations, and is widely used in automobiles, irrigation, chemical industry, construction, fire protection and other fields.

[0003] In some technologies, in order to enhance the pressure resistance and wear resistance of plastic hoses and other properties related to hose strength, a reinforcing rib structure is set on the outside of the hose. For example, a fire-fighting water suction pipe with spiral reinforcing ribs is described in Chinese patent with publication number CN207378326U.

[0004] In the field of hoses, the bending radius is a key performance parameter in hose design and manufacturing, and also an important performance characteristic of hoses. There is often a contradiction between increasing the strength of hoses and their flexibility. For example, the fittings described in the above technical solution will have their bending radius increased accordingly after the strength is increased by reinforcing ribs, making the hose more difficult to bend. Therefore, it is necessary to carry out research in the field of hoses that can effectively increase the strength of hoses but have little impact on the bending radius performance of hoses. Summary of the Invention

[0005] In order to improve the problem that increasing the strength of a hose in the current technology will correspondingly increase the bending radius of the hose, the purpose of this invention is to provide a reinforcing material, its preparation method and application, which can increase the strength of the hose while keeping the bending radius of the hose at a low level.

[0006] To achieve the objectives of this invention, the present invention first provides a reinforcing rib material, employing the following technical solution:

[0007] A reinforcing rib material, comprising the following components:

[0008] At least one thermoplastic polyolefin, wherein the thermoplastic polyolefin comprises 80 to 120 parts by weight;

[0009] 15-20 parts by weight of fiber;

[0010] Grafting material;

[0011] When the components are mixed, the compression section and mixing section of the screw that mixes the components are provided with pins, and the screw as a whole is provided with helical grooves.

[0012] To synergistically increase the strength and flexibility of the outer reinforcing ribs of the hose, fibers were added as a reinforcing phase to the polyolefin base material. Studies found that as the total fiber content increased, the bending radius of the hose with outer reinforcing ribs decreased, while the hose strength continuously increased. When the total fiber content reached 15 parts by weight, the hose bending radius was minimized while maintaining a certain level of strength; this material formulation is suitable for use as an outer reinforcing rib of the hose. When the total fiber content exceeded 15 parts by weight, both the bending radius and strength of the hose increased. To further increase the hose strength near the minimum bending radius level, the above technical solution found that using a screw combining pins and spiral grooves during component mixing could, through the orientation of fibers in the homogeneous mixed phase, allow the total fiber content in the material to exceed 15 parts by weight, achieving higher strength while simultaneously maintaining the bending radius at a minimum level, thus meeting the combined requirements of hose strength and flexibility.

[0013] The implementation can include any or all of the following features.

[0014] In one embodiment, the fiber is a mixture of glass fiber and carbon fiber, wherein the content of glass fiber is greater than the content of carbon fiber.

[0015] Glass fiber has lower strength than carbon fiber. When there is a need to enhance both the strength and flexibility of hoses, it is easier to match and adjust the strength and flexibility of the material to the target range by using a higher content of glass fiber. However, if the carbon fiber content is higher than that of glass fiber, the material may have too high strength but insufficient flexibility.

[0016] In one embodiment, the total amount of fiber is 15 to 18 parts by weight, the ratio of glass fiber to carbon fiber content is 2:1, and the fiber length is less than or equal to 2 mm.

[0017] In one embodiment, the thermoplastic polyolefin includes high-density polyethylene, ultra-high molecular weight polyethylene, polypropylene, and polyolefin elastomers, and further includes the following components: fillers, lubricants, antioxidants, and coupling agents.

[0018] This invention also provides a method for preparing a reinforcing rib material, using the following technical solution:

[0019] A method for preparing a reinforcing rib material includes the following steps:

[0020] S1, the thermoplastic polyolefin and the grafting material are mixed and melted to obtain a premixed material;

[0021] S2, the fiber, coupling agent, filler, lubricant and antioxidant are added to the premixed material for mixing and extrusion molding to obtain reinforcing rib material masterbatch;

[0022] At least in step S2, during the mixing process, pins are provided in the compression section and mixing section of the screw, and the screw as a whole is provided with a spiral groove, the depth of which gradually changes from deep to shallow.

[0023] The above technical solution involves first mixing and melting the main material, thermoplastic polyolefin, in a screw extruder or other mixing equipment until it achieves good fluidity. Then, the fiber-based reinforcing component is added, allowing the reinforcing component to disperse rapidly and uniformly within the main material. Furthermore, the use of a screw with a combination of pins and spiral grooves disrupts the two-phase flow during melting, promoting melting. As the material is conveyed, the flow stream is repeatedly split and merged, forcing the fiber orientation in the mixed phase to align more closely with the material conveying direction. Experiments show that the reinforcing material processed in this way achieves a lower bending radius.

[0024] In one embodiment, in step S1, the polypropylene is mixed with the grafting material to obtain a first mixed material; the remaining thermoplastic polyolefins are mixed to obtain a second mixed material; the first mixed material and the second mixed material are mixed and melted to obtain the premixed material.

[0025] In step S2, the coupling agent and the fiber are mixed to obtain mixed material No. 3, and the filler, lubricant and antioxidant are mixed to obtain mixed material No. 4. Mixed material No. 3 and mixed material No. 4 are added to the premixed material for mixing and extrusion molding to obtain the reinforcing rib material masterbatch.

[0026] In one embodiment, a ring of pins is provided between adjacent spiral grooves in the compression section.

[0027] In one embodiment, in the mixing section, two rings of pins are provided between adjacent spiral grooves.

[0028] In one embodiment, the depth of the spiral groove gradually changes from 0.1D to 0.25D.

[0029] The mixing strength of the pins is higher than that of the spiral grooves. In this application, it is preferred that the pins play a uniform role in fiber orientation at the beginning of component mixing. After the mixing section, the subsequent mixing and shearing of the components are completed only by the spiral grooves with weaker mixing strength, and the pin combination is no longer used, so as not to disrupt the already uniform fiber orientation and avoid fiber entanglement and breakage.

[0030] This invention also provides an application of a prepared reinforcing material in a flexible hose, employing the following technical solution:

[0031] The above-described preparation method describes the application of a reinforcing material prepared by the above method in a hose, wherein the reinforcing material is used to prepare the outer reinforcing layer of the hose.

[0032] In summary, this invention provides a fiber-reinforced material, its preparation method, and its application, which have the following beneficial effects:

[0033] This invention first discovered the relationship between the fiber content in the reinforcing material component with fiber reinforcement phase and the bending radius and strength of the hose product. Furthermore, by appropriately increasing the fiber content, optimizing the mixing sequence of the reinforcing material component, and mixing the reinforcing material through a combination of pins and spiral grooves, the fibers are uniformly dispersed in the thermoplastic elastomer matrix, and the fibers are controlled to be easily arranged uniformly in the conveying direction. This allows the hose with the reinforced structure to obtain higher strength, while its bending radius is still maintained near the minimum level. This provides an effective material formulation and preparation method for reinforced hose products. Attached Figure Description

[0034] Figure 1 This is a flowchart of the method for preparing the reinforcing rib material in Example 1. Detailed Implementation

[0035] The embodiments of the present invention will be further described below with reference to the accompanying drawings and specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. It should be noted that many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0036] In order to improve the strength of the hose without significantly affecting its bending radius, this application uses thermoplastic elastomer as the base material, adds fibers as the reinforcing phase, and extrudes and granulates it to produce a reinforcing material. The reinforcing material and the hose body material are then extruded to produce a hose with a reinforced outer layer.

[0037] The inner layer below is the hose body, and the outer layer is a hose with a reinforcing structure made of the reinforcing material of this application, which will be referred to simply as a hose. The following embodiments use a hose with a continuous spiral reinforcing structure as the test product. In some embodiments, the reinforcing structure can be other continuous or discontinuous shapes. The reinforcing ribs of the hose of this application are used to meet the pressure and strength requirements of the hose while maintaining a relatively low bending radius.

[0038] Research has found that in the reinforcing material of this application, as the total fiber content increases, the tensile strength of the manufactured hose continuously increases, while the bending radius shows a trend of first decreasing and then increasing. The lowest bending radius is reached when the total fiber content is 15 parts by weight. In other words, experiments show that in this application, when the total fiber content is 15 parts by weight, the hose has the lowest bending radius and the tensile strength required for hose use (experimental results are shown in Table 2 below).

[0039] In order to further increase the tensile strength of the hose while still keeping the bending radius of the hose at a minimum level, this application will continue to increase the fiber content in the material and adopt improvements in the raw material mixing process and special screw combination to control the preparation process of the reinforcing material.

[0040] This application discloses a reinforcing material comprising the following components:

[0041] At least one thermoplastic polyolefin, wherein the thermoplastic polyolefin comprises 80 to 120 parts by weight;

[0042] 15-20 parts by weight of fiber;

[0043] Grafting material;

[0044] It also includes fillers, lubricants, antioxidants, and coupling agents.

[0045] The thermoplastic polyolefin includes high-density polyethylene (HDPE), ultra-high molecular weight polyethylene (UHMWPE), polypropylene (PP), and polyolefin elastomer (POE). The HDPE is 60-80 parts by weight, the UHMWPE is 5-10 parts by weight, the polypropylene is 20-30 parts by weight, and the polyolefin elastomer is 10-15 parts by weight.

[0046] The high-density polyethylene used is Shanghai Petrochemical YGH041T, with a tensile yield strength >24 MPa, elongation at break >600%, and embrittlement temperature below -70℃.

[0047] The ultra-high molecular weight polyethylene (UHMWPE) used is American Ticona GUR4150, with a tensile modulus of 680 MPa, elongation at break >50%, and tensile creep modulus of 430 MPa.

[0048] The polypropylene (PP) used is Shanghai SECCO K8003, with a tensile yield strength of 24 MPa, an elongation at break of >200%, and a flexural modulus of 1300 MPa.

[0049] The grafting material is 6-12 parts by weight, and the grafting material includes a maleic anhydride grafting compatibilizer, for example, the grafting material includes at least one of PP-g-MAH and POE-g-MAH. The grafting rate of the grafting material is >1.5%.

[0050] The filler is 15-20 parts by weight, and the filler is an inorganic filler, such as nano-calcium carbonate. The nano-calcium carbonate is selected with a content of 99%, a particle size of 3 μm, a calcium content of 96%, and a whiteness of 90%.

[0051] The fiber is 15-20 parts by weight, and the fiber is a mixture of glass fiber and carbon fiber. The glass fiber is alkali-free glass fiber with a diameter of 13 μm and a length of 2 mm, and the carbon fiber has a diameter of 6 μm, a length of 1 mm, and 12,000 segments.

[0052] The lubricant is 4-8 parts by weight, and the lubricant includes OPE wax. The OPE wax is selected from Zhenming Chemical SR100, which is spherical and has an effective content of >95%.

[0053] The antioxidant is 3-5 parts by weight, and the antioxidant includes antioxidant 1010, wherein antioxidant 1010 is selected from BASFIrganox 1010 with a molecular weight of 1178 g / mol.

[0054] The coupling agent is 1.5 to 3 parts by weight, and the coupling agent includes a silane coupling agent. The silane coupling agent selected is Dow Corning Z-6030, which has a melting point of -48°C, a boiling point of 190°C, and a density of 201 g / cm³.

[0055] The material formulation and preparation method of the present invention will be further illustrated below through specific embodiments.

[0056] Example 1

[0057] This embodiment first discloses a reinforcing rib material, expressed in parts by weight, comprising the following components:

[0058] High-density polyethylene (HDPE): 60 parts

[0059] Ultra-high molecular weight polyethylene (UHMWPE): 5 parts

[0060] Polypropylene (PP): 20 parts

[0061] POE polyolefin: 15 parts

[0062] Grafted material PP-g-MAH: 3 parts

[0063] Grafting material POE-g-MAH: 5 parts

[0064] Fiberglass: 10 parts

[0065] Carbon fiber: 5 parts

[0066] Nano calcium carbonate: 15 parts

[0067] OPE wax: 4 parts

[0068] Antioxidant 1010: 3 parts

[0069] Silane coupling agent: 1.5 parts

[0070] Please refer to Figure 1 This embodiment also discloses a method for preparing the above-mentioned reinforcing rib material, including the following steps:

[0071] According to the above component weight ratio:

[0072] S1, the polypropylene is mixed with the grafted material PP-g-MAH and the grafted material POE-g-MAH to obtain mixed material No. 1; the high-density polyethylene, ultra-high molecular weight polyethylene and POE polyolefin are mixed to obtain mixed material No. 2.

[0073] S2, the first mixed material and the second mixed material are added to a twin-screw extruder and mixed until they are in a molten state to obtain a premixed material;

[0074] S3, the silane coupling agent is mixed with the glass fiber and the carbon fiber to obtain the third mixed material; the nano calcium carbonate, OPE wax and antioxidant 1010 are mixed to obtain the fourth mixed material;

[0075] S4, add the No. 3 mixed material and the No. 4 mixed material to the premixed material, mix and extrude to obtain the reinforcing rib material masterbatch.

[0076] In the above steps, the order of steps S1 to S3 does not limit the actual implementation. Provided that step S4 is satisfied, the order of S1 to S3 can be adjusted according to the actual situation.

[0077] In steps S1 to S3 above, the mixing of mixing materials one, two, three, and four is carried out in a mixing device. For example, in this embodiment, the mixing of all four mixing materials is carried out in a high-speed centrifugal mixing device. Mixing materials two and three can be appropriately heated during mixing, optionally between 25°C and 80°C. For example, in this embodiment, mixing material one is mixed at high speed at 60°C, and mixing material two is mixed at high speed at 70°C. The mixing speed and mixing time can be adjusted according to actual conditions. Optionally, the mixing speed is between 200 r / min and 1500 r / min, and the mixing time is between 10 min and 30 min. For example, in this embodiment, mixing material one is mixed at 600 r / min for 15 min, mixing material two at 600 r / min for 10 min, mixing material three at 1200 r / min for 20 min, and mixing material four at 300 r / min for 20 min.

[0078] In step S4 above, the No. 3 and No. 4 mixed materials are sequentially added to the twin-screw extruder containing the premixed material for mixing and extrusion molding.

[0079] In steps S2 and S4 above, a twin-screw extruder with a screw featuring a combination of pins and helical grooves is used for mixing, extrusion, and granulation. Specifically, the screw is divided into a compression section, a mixing section, a plasticizing section, a devolatilization section, and a reaction section. The temperature ranges for the compression section, mixing section, plasticizing section, and devolatilization section are 140-160℃, 150-170℃, 160-180℃, and 140-160℃ respectively, while the reaction section ranges for 180-200℃. Pins are installed in the compression and mixing sections of the screw, and the entire screw is provided with helical grooves, the depth of which gradually decreases from deep to shallow.

[0080] Furthermore, in the compression section of the screw, one ring of pins is arranged between adjacent spiral grooves, and in the mixing section of the screw, two rings of pins are arranged between adjacent spiral grooves. The depth of the spiral grooves gradually changes from 0.1D to 0.25D, where D represents the diameter of the screw. The specific lengths, spiral groove depths, and pin configurations of each reaction section are shown in Table 1.

[0081] Table 1. Data on the length, spiral groove depth, and pin configuration of each reaction section.

[0082]

[0083] In one specific embodiment, depending on the diameter of the screw, the compression section can be arranged with 6 pins, and the mixing section can be arranged with 12 pins.

[0084] In one specific embodiment, the devolatilization section of the screw may be provided with a vacuum exhaust port, and / or the reaction section may be provided with kneading blocks at two and / or three ends.

[0085] In this embodiment, the pin is a cylindrical pin. In other embodiments, the pin may be a square, rhomboid, or other shapes. The shape and size of the pin do not constitute a unique limitation on the technical solution of this application.

[0086] Example 2

[0087] The only difference between this embodiment and Embodiment 1 is the fiber component content. In this embodiment, glass fiber: 12 parts, carbon fiber: 6 parts. The reinforcing rib material masterbatch is prepared by using the components of this embodiment according to the method described in Embodiment 1.

[0088] Comparative Example 1

[0089] The difference between this comparative example and Example 1 is that the fiber component content is different, and the screw of the twin-screw extruder is different.

[0090] In this comparative example, glass fiber: 5 parts, carbon fiber: 3 parts.

[0091] In this comparative example, the twin-screw extruder used was a standard twin-screw extruder with only helical grooves, and the depth of the helical grooves did not gradually change. The components of this comparative example were used to prepare reinforcing rib material masterbatch according to the method described in Example 1.

[0092] Comparative Example 2

[0093] The difference between this comparative example and Example 1 is that the fiber component content is different, and the screw of the twin-screw extruder is different.

[0094] In this comparative example, glass fiber: 8 parts, carbon fiber: 4 parts.

[0095] In this comparative example, the twin-screw extruder used was a standard twin-screw extruder with only helical grooves, and the depth of the helical grooves did not gradually change. The components of this comparative example were used to prepare reinforcing rib material masterbatch according to the method described in Example 1.

[0096] Comparative Example 3

[0097] The difference between this comparative example and Example 1 is that the screw of the twin-screw extruder is different.

[0098] In this comparative example, the twin-screw extruder used was a standard twin-screw extruder with only helical grooves, and the depth of the helical grooves did not gradually change. The components of this comparative example were used to prepare reinforcing rib material masterbatch according to the method described in Example 1.

[0099] Comparative Example 4

[0100] The difference between this comparative example and Example 2 is that the screw of the twin-screw extruder is different.

[0101] In this comparative example, the twin-screw extruder used was a standard twin-screw extruder with only helical grooves, and the depth of the helical grooves did not gradually change. The components of this comparative example were used to prepare reinforcing rib material masterbatch according to the method described in Example 1.

[0102] Comparative Example 5

[0103] The difference between this comparative example and Example 1 lies in the mixing method of the components. All the components described in Example 1 are weighed separately and mixed sequentially to form a mixture of all the components. The mixture is then added to the twin-screw extruder described in Example 1 for extrusion granulation to obtain reinforcing rib material masterbatch.

[0104] Comparative Example 6

[0105] The only difference between this comparative example and Example 1 is the different component formulation. This comparative example does not contain POE polyolefin and graft material POE-g-MAH. The components of this comparative example are prepared into reinforcing rib material masterbatch according to the method described in Example 1.

[0106] Performance testing experiment

[0107] The reinforcing rib material masterbatches obtained in Examples 1-2 and Comparative Examples 1-6 above were processed with commercially available hose masterbatches to form hoses with externally fixed spiral reinforcing rib structures, which were used as test samples. The hose masterbatches can be made of commonly used rubber or plastics, and the processing methods can be existing equipment such as twin-screw extruders and spiral winding units, and the hose products can be manufactured using existing extrusion molding processes, which will not be described in detail here.

[0108] Referring to the test standard methods of GB6969 (bending radius), ISO527 (tensile strength, elongation), ISO178 (flexural modulus), and ISO306 (Vicat softening), the bending radius, tensile strength, elongation, flexural modulus, and Vicat softening of the above samples were tested, and the results are shown in Table 2 below.

[0109] Table 2 Performance test results

[0110]

[0111] As can be seen from Comparative Examples 1 to 4 in Table 1, as the total amount of glass fiber and carbon fiber increases, the bending radius of the tested hoses shows a trend of first decreasing and then increasing, while the tensile strength shows a trend of continuously increasing. When Comparative Example 3 is implemented, the bending radius of the sample reaches its lowest point. At this time, the total fiber content in the reinforcing rib material masterbatch formula is 15 parts by weight. Therefore, it can be preliminarily determined that when the total fiber content is 15 to 20 parts by weight, a material with significantly increased strength and a bending radius within a small range can be obtained, which can meet the current requirements for the strength and flexibility of hose reinforcement structure materials.

[0112] As can be seen from Examples 1-2 and Comparative Examples 3-4, by using the formulation, preparation method and processing method of the pin and spiral groove combined screw described in Example 1 of this application, the bending radius of the sample hose can still be maintained at a relatively low level even when the total fiber content of the reinforcing rib material increases. Ultimately, a hose product with higher strength but still with a bending radius near the lowest point can be obtained.

[0113] As can be seen from Example 1 and Comparative Example 5, the method of mixing each component in steps and then adding the third and fourth mixing materials after obtaining the premixed material can improve the uniformity of each component of the material and have a positive effect on maintaining the bending radius of the hose at a low level.

[0114] As can be seen from Example 1 and Comparative Example 6, adding POE polyolefin and grafted POE-g-MAH components to the reinforcing material formulation has a positive effect on synergistically maintaining the hose strength and bending radius near the optimal level.

[0115] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A reinforcing rib material, characterized in that, Components included: At least one thermoplastic polyolefin, wherein the thermoplastic polyolefin comprises 80 to 120 parts by weight; 15-20 parts by weight of fiber; Grafting material; The fiber is a mixture of glass fiber and carbon fiber; The total amount of fiber is 15-18 parts by weight, the ratio of glass fiber to carbon fiber is 2:1, and the fiber length is less than or equal to 2 mm. The screw for mixing the components has pins in its compression and mixing sections, and the screw as a whole has helical grooves. In the compression section, a ring of pins is provided between adjacent spiral grooves; in the mixing section, two rings of pins are provided between adjacent spiral grooves; the pins in the compression section are arranged in a single row in an alternating pattern, and the pins in the mixing section are arranged in a double row in a symmetrical pattern. The spiral groove depth of the compression section gradually changes from 0.25D to 0.18D, the spiral groove depth of the mixing section gradually changes from 0.18D to 0.12D, the spiral groove depth of the plasticizing section of the screw gradually changes from 0.12D to 0.08D, the spiral groove depth of the devolatilization section of the screw gradually changes from 0.08D to 0.15D, and the spiral groove depth of the reaction section of the screw gradually changes from 0.15D to 0.1D.

2. The reinforcing rib material as described in claim 1, characterized in that, The thermoplastic polyolefin includes high-density polyethylene, ultra-high molecular weight polyethylene, polypropylene, and polyolefin elastomers, and also includes the following components: fillers, lubricants, antioxidants, and coupling agents.

3. The method for preparing a reinforcing rib material as described in claim 2, characterized in that, Includes the following steps: S1, the thermoplastic polyolefin and the grafting material are mixed and melted to obtain a premixed material; S2, the fiber, coupling agent, filler, lubricant and antioxidant are added to the premixed material for mixing and extrusion molding to obtain reinforcing rib material masterbatch.

4. The method for preparing a reinforcing rib material as described in claim 3, characterized in that: In step S1, the polypropylene is mixed with the grafting material to obtain mixed material No. 1; the remaining thermoplastic polyolefins are mixed to obtain mixed material No.

2. The first mixed material and the second mixed material are mixed and melted to obtain the premixed material; In step S2, the coupling agent and the fiber are mixed to obtain mixed material No. 3, and the filler, lubricant, and antioxidant are mixed to obtain mixed material No.

4. The No. 3 and No. 4 mixed materials are added to the premixed material for mixing and extrusion molding to obtain the reinforcing rib material masterbatch.

5. The application of a reinforcing material as described in claim 1 in a flexible hose, characterized in that, The reinforcing material is used to prepare the outer reinforcing rib of the hose.

Images