Rubber hose and preparation method thereof

Abstract

The invention relates to the technical field of hoses, in particular to a rubber hose and a preparation method thereof. The rubber hose sequentially comprises an inner rubber layer and an outer rubber layer from inside to outside in the pipe diameter direction, the cord fabric layer is formed on the inner rubber layer; the first middle rubber layer is formed on the cord fabric layer; the steel wire winding layer is formed on the first middle rubber layer; a steel wire in the steel wire winding layer is a spring steel wire; the spring steel wire forms a spiral supporting structure; the second middle rubber layer is formed on the steel wire winding layer; and the outer rubber layer is formed on the second middle rubber layer. According to the rubber hose, all the layer groups can be well matched, and the finally obtained rubber hose is smaller in bending radius, larger in drawing force, lower in roller abrasion value and longer in service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rubber hose and its preparation method. BACKGROUND

[0002] Sand blasting hose (rubber hose for sand and grit blasting) is an industrial hose, mainly used in mechanical manufacturing, aerospace, ship maintenance, construction, automobile manufacturing and other fields, supporting dry sand blasting and wet sand blasting operation modes, suitable for temperature range of-20~70℃, and maximum working pressure of 0.63MPa.

[0003] The existing sand blasting hose is composed of an inner rubber layer, a reinforcing layer and an outer rubber layer. According to the conductive performance, it is divided into three types of A type (resistance ≤10²Ω), B type (resistance ≤1MΩ) and C type (non-conductive type). The product needs to meet the liquid pressure test burst pressure not less than 4 times of the working pressure, and the bending deformation value KD≤0.8D at 23℃. The wear resistance is tested according to the standard of HG / T2192-2008, and some users still use Akron abrasion method standard (≤0.8cm³ / 1.61km). When selecting, the hose specifications need to be matched according to the type of abrasive (particle size, hardness), pressure requirement and operation environment (such as temperature, chemical corrosion).

[0004] The sand blasting hose needs to bear pressure in the use process, and the suction flattening phenomenon may occur, which reduces the service life of the sand blasting hose. SUMMARY

[0005] Therefore, the present application provides a rubber hose and its preparation method. The rubber hose provided by the present application has smaller bending radius, greater pulling force, lower drum abrasion value and longer service life.

[0006] The present application provides a rubber hose, which comprises, in sequence from inside to outside along the pipe diameter direction:

[0007] An inner rubber layer;

[0008] A cord layer formed on the inner rubber layer;

[0009] A first middle rubber layer formed on the cord layer;

[0010] A steel wire winding layer formed on the first middle rubber layer; the steel wire in the steel wire winding layer is a spring steel wire; the spring steel wire forms a spiral support structure;

[0011] A second middle rubber layer formed on the steel wire winding layer;

[0012] An outer rubber layer formed on the second middle rubber layer.

[0013] Preferably, the diameter of the spring steel wire is 1.5-2.3 mm;

[0014] The spring steel wire has an elastic modulus of 200-210 GPa, a stiffness of 8-9 N / mm, and a tensile strength of 1700-2100 MPa.

[0015] Preferably, the spacing between adjacent steel wires in the winding of the spring steel wire is 9-25 mm, and the winding angle is 45°-54°.

[0016] Preferably, the cord layer is a double-layer cord, comprising a first cord and a second cord, and the first cord and the second cord have different winding directions.

[0017] The first cord is wound in the Z direction, and the second cord is wound in the S direction.

[0018] Preferably, the linear density of the first cord and the second cord is 0.9-1.1 mm, and the area density is 80-120 g / m 2 ;

[0019] The first cord and the second cord are independently selected from polyester or nylon, and have a tensile strength of 773-910 MPa.

[0020] The thickness of the first cord is 0.8-1.2 mm, and the thickness of the second cord is 0.8-1.2 mm.

[0021] Preferably, the inner rubber layer is prepared from raw materials comprising the following weight parts:

[0022] 60-80 parts of styrene-butadiene rubber, 20-40 parts of natural rubber, 55-75 parts of high-structure carbon black, 3-10 parts of plasticizer, 2-6 parts of antioxidant, 1-5 parts of accelerator, and 1.0-1.8 parts of vulcanizing agent;

[0023] The thickness of the inner rubber layer is 1.5-3.0 mm.

[0024] Preferably, the first intermediate rubber layer is prepared from raw materials comprising the following weight parts:

[0025] 40-60 parts of styrene-butadiene rubber, 40-60 parts of natural rubber, 40-60 parts of high-structure carbon black, 3-10 parts of plasticizer, 2-6 parts of antioxidant, 1-4 parts of accelerator, and 1.5-2.5 parts of vulcanizing agent;

[0026] The thickness of the first intermediate rubber layer is 0.4-0.8 mm.

[0027] Preferably, the second intermediate rubber layer is prepared from raw materials comprising the following weight parts:

[0028] 40~60 parts of butadiene styrene rubber, 40~60 parts of natural rubber, 40~60 parts of high structure carbon black, 3~10 parts of plasticizer, 2~6 parts of antioxidant, 1~4 parts of accelerator and 1.5~2.5 parts of vulcanizing agent;

[0029] The thickness of the second middle rubber layer is 0.4~0.8 mm.

[0030] Preferably, the outer rubber layer is prepared from raw materials including the following parts by weight:

[0031] 40~60 parts of butadiene styrene rubber, 40~60 parts of natural rubber, 30~50 parts of high structure carbon black, 3~8 parts of plasticizer, 1~3 parts of adhesive, 2~3 parts of antioxidant, 3~5 parts of accelerator and 2~3 parts of vulcanizing agent;

[0032] The thickness of the outer rubber layer is 2.5~5 mm.

[0033] The present application also provides a preparation method of the above rubber hose, comprising the following steps:

[0034] A) preparing an inner rubber sheet from the raw materials of the inner rubber layer, winding it on a mandrel to obtain the inner rubber layer;

[0035] B) winding the cord fabric on the inner rubber layer to obtain the cord fabric layer;

[0036] C) preparing a first middle rubber sheet from the raw materials of the first middle rubber layer, winding it on the cord fabric layer to obtain the first middle rubber layer;

[0037] D) winding the spring steel wire on the first middle rubber layer to obtain the steel wire winding layer;

[0038] E) preparing a second middle rubber sheet from the raw materials of the second middle rubber layer, winding it on the steel wire winding layer to obtain the second middle rubber layer;

[0039] F) preparing an outer rubber sheet from the raw materials of the outer rubber layer, winding it on the second middle rubber layer, and after vulcanization, obtaining the rubber hose.

[0040] In the present application, the steel wire winding layer has partial pressure bearing capacity and supporting effect. The spring steel wire used in the present application can increase the bending performance and ensure the tensile strength of the hose during use. The spring steel wire forms a spiral support structure, uniformly transmits external pressure to the entire hose circumference, and reduces local stress concentration; when the hose is bent, the spring steel wire absorbs part of the mechanical stress through elastic deformation, reducing material fatigue damage; the mechanical barrier formed by the steel wire winding effectively inhibits the radial expansion of the hose under high pressure, maintaining the structural stability. The inner rubber layer has good wear resistance and certain heat resistance; the cord layer is a reinforcing layer that plays a decisive role in the pressure resistance of the rubber hose; the first middle rubber layer is well bonded with the cord layer, filling the performance of the steel wire layer; the outer rubber layer has wear resistance and aging resistance. The various layer groups in the present application can work well together, and the resulting rubber hose has a smaller bending radius, greater tensile strength, lower drum abrasion value, and longer service life. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 A rubber hose provided by an embodiment of the present application has a pipe material cross-sectional view along the pipe diameter direction;

[0042] Figure 2 A layer group schematic diagram of a rubber hose provided by an embodiment of the present application. DETAILED DESCRIPTION

[0043] The technical solutions of the present application will be described in detail below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0044] The present application provides a rubber hose, which comprises, in order from inside to outside along the pipe diameter direction:

[0045] An inner rubber layer;

[0046] A cord layer formed on the inner rubber layer;

[0047] A first middle rubber layer formed on the cord layer;

[0048] A steel wire winding layer formed on the first middle rubber layer; the steel wire in the steel wire winding layer is a spring steel wire; the spring steel wire forms a spiral support structure;

[0049] A second middle rubber layer formed on the steel wire winding layer;

[0050] An outer rubber layer formed on the second middle rubber layer.

[0051] Figure 1A tube material sectional view of a rubber hose provided by an embodiment of the present application along a tube diameter direction. Wherein, 1 is an inner rubber layer, 2 is a cord layer, 2-1 is a first cord, 2-2 is a second cord, 3 is a first middle rubber layer, 4 is a steel wire winding layer, 5 is a second middle rubber layer, and 6 is an outer rubber layer.

[0052] Figure 2 A layer group schematic view of a rubber hose provided by an embodiment of the present application. Wherein, 1 is an inner rubber layer, 2 is a cord layer, 2-1 is a first cord, 2-2 is a second cord, 3 is a first middle rubber layer, 4 is a steel wire winding layer, 5 is a second middle rubber layer, and 6 is an outer rubber layer.

[0053] In some embodiments of the present application, the raw rubber of the inner rubber layer comprises and specifically consists of styrene-butadiene rubber and natural rubber. The mass ratio of the styrene-butadiene rubber and the natural rubber is 60-80:20-40, such as 70:30.

[0054] In some embodiments of the present application, the inner rubber layer is prepared from raw materials comprising the following weight parts:

[0055] 60-80 parts of styrene-butadiene rubber, 20-40 parts of natural rubber, 55-75 parts of high-structure carbon black, 3-10 parts of plasticizer, 2-6 parts of antioxidant, 1-5 parts of accelerator, and 1.0-1.8 parts of vulcanizing agent.

[0056] Specifically, the inner rubber layer is prepared from raw materials comprising the following weight parts:

[0057] 70 parts of styrene-butadiene rubber, 30 parts of natural rubber, 65 parts of high-structure carbon black, 7 parts of plasticizer, 4 parts of antioxidant, 2.5 parts of accelerator, and 1.5 parts of vulcanizing agent.

[0058] The styrene-butadiene rubber is styrene-butadiene rubber 1502.

[0059] The high-structure carbon black has a specific surface area of 42-50 m 2 / g and a pore volume of 110-130 cm 3 / 100g. Specifically, the high-structure carbon black can be N550 and / or N774.

[0060] The plasticizer is a phthalate ester substance, such as dimethyl phthalate.

[0061] The antioxidant is a phenolic substance, such as tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester.

[0062] The accelerator is a sulfenamide accelerator, such as N-cyclohexyl-2-benzothiazole sulfenamide.

[0063] The vulcanizing agent is sulfur.

[0064] In some embodiments of the present application, the inner rubber layer has a thickness of 1.5-3.0 mm, such as 2 mm.

[0065] In the present application, the inner rubber layer is in direct contact with the sand and gravel in the pipe and bears the friction force, has a certain wear resistance, and also has a certain resistance to flexing aging, which can improve the process performance.

[0066] In some embodiments of the present application, the cord layer is a double-layer cord layer, which comprises a first cord and a second cord, and the first cord and the second cord have different winding directions. Specifically, the first cord is wound in the Z direction, and the second cord is wound in the S direction.

[0067] The first cord and the second cord are both large-diameter high-strength impregnated cords. The diameter of the first cord and the second cord is 0.9-1.1 mm, such as 1 mm. The material of the first cord and the second cord is independently selected from polyester (such as polyethylene terephthalate PET) or nylon, and the tensile strength is 773-910 MPa, such as 800 MPa.

[0068] The area density of the first cord and the second cord is 80-120 g / m 2 , such as 100 g / m 2 .

[0069] The present application does not have special restrictions on the source of the first cord and the second cord, which can be generally commercially available.

[0070] In some embodiments of the present application, the thickness of the first cord is 0.8-1.2 mm, such as 1 mm. The thickness of the second cord is 0.8-1.2 mm, such as 1 mm.

[0071] In the present application, the cord layer serves as the reinforcing layer of the rubber hose and can bear the pressure of the internal fluid to prevent the hose from swelling, deforming or rupturing due to excessive pressure when conveying sand and gravel and other media. The present application selects large-diameter high-strength impregnated cords, and the winding directions of the two cords are different; the first cord is wound in the Z direction, and the second cord is wound in the S direction. The fiber material of the cord layer itself has high tensile strength, and the impregnation treatment further enhances the bonding force between the fibers, so that the hose is not easy to break when subjected to stretching or bending. The weaving structure of the cord gives the hose good flexibility, making it easy to bend and install; the impregnation treatment reduces the friction loss between the fibers, prolonging the service life of the hose in a repeated bending or vibrating environment.

[0072] In some embodiments of the present invention, the raw rubber of the first intermediate rubber layer includes styrene-butadiene rubber (SBR) and natural rubber, specifically, it may be composed of SBR and natural rubber. The mass ratio of the SBR to natural rubber is 40~60:40~60, for example, 50:50.

[0073] In some embodiments of the present invention, the first intermediate adhesive layer is prepared from raw materials comprising the following parts by weight:

[0074] 40-60 parts styrene-butadiene rubber, 40-60 parts natural rubber, 40-60 parts high-structure carbon black, 3-10 parts plasticizer, 2-6 parts antioxidant, 1-4 parts accelerator and 1.5-2.5 parts vulcanizing agent.

[0075] Specifically, the first intermediate adhesive layer is prepared from raw materials comprising the following parts by weight:

[0076] 50 parts styrene-butadiene rubber, 50 parts natural rubber, 50 parts high-structure carbon black, 7 parts plasticizer, 3.5 parts antioxidant, 2.2 parts accelerator and 2 parts vulcanizing agent.

[0077] The styrene-butadiene rubber is styrene-butadiene rubber 1502.

[0078] The specific surface area of ​​the high-structure carbon black is 42~50 m². 2 / g; pore volume is 110~130 cm³ 3 / 100g. Specifically, the high-structure carbon black can be N550 and / or N774.

[0079] The plasticizer is a phthalate, such as dimethyl phthalate.

[0080] The antioxidant is a phenolic substance, such as pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid].

[0081] The accelerator is a sulfenamide accelerator, such as N-cyclohexyl-2-benzothiazole sulfenamide.

[0082] The vulcanizing agent is sulfur.

[0083] In some embodiments of the present invention, the thickness of the first adhesive layer is 0.4 to 0.8 mm, for example, 0.6 mm.

[0084] In this invention, the first intermediate adhesive layer adheres well to the fabric layer. High-structure carbon black adds high hardness and strength to the adhesive compound. The appropriate thickness of the first intermediate adhesive layer better protects the steel wire.

[0085] The steel wires in the wire winding layer of the present invention are spring steel wires; the spring steel wires form a spiral support structure.

[0086] In some embodiments of the present application, the diameter of the spring steel wire is 1.5-2.3 mm, such as 1.6 mm, 1.8 mm, 2.2 mm. The spring steel wire has an elastic modulus of 200-210 GPa, such as 205 GPa; a stiffness of 8-9 N / mm, such as 8.53 N / mm; and a tensile strength of 1700-2100 Mpa, such as 1900 Mpa.

[0087] In the present application, the steel wire winding layer has partial pressure bearing capacity and supporting effect. The spring steel wire is used to replace the ordinary copper-plated steel wire or zinc-plated steel wire, and the spring steel wire can increase the bending performance and ensure the anti-pulling force during the use of the hose. The spring steel wire forms a spiral support structure, uniformly conducts the external pressure to the entire circumference of the hose, and reduces the local stress concentration; when the hose is bent, the spring steel wire absorbs part of the mechanical stress through elastic deformation, reducing material fatigue damage; the mechanical barrier formed by the steel wire winding effectively inhibits the radial expansion of the hose under high pressure, maintaining the structural stability.

[0088] In some embodiments of the present application, the spring steel wire can be wound in a clockwise direction, and the spacing between adjacent steel wires in the winding is 9-25 mm, such as 15 mm; the winding angle is 45°-54°, such as 50°. The further limitation of the winding method, winding density and winding angle of the spring steel wire in the present application helps to promote the pressure resistance and anti-blasting effect of the hose.

[0089] In some embodiments of the present application, the raw rubber of the second middle rubber layer comprises and specifically consists of styrene-butadiene rubber and natural rubber. The mass ratio of the styrene-butadiene rubber and the natural rubber is 40-60:40-60, such as 50:50.

[0090] In some embodiments of the present application, the second middle rubber layer is prepared from raw materials comprising the following weight parts:

[0091] 40-60 parts of styrene-butadiene rubber, 40-60 parts of natural rubber, 40-60 parts of high-structure carbon black, 3-10 parts of plasticizer, 2-6 parts of antioxidant, 1-4 parts of accelerator and 1.5-2.5 parts of vulcanizing agent.

[0092] Specifically, the second middle rubber layer is prepared from raw materials comprising the following weight parts:

[0093] 50 parts of styrene-butadiene rubber, 50 parts of natural rubber, 50 parts of high-structure carbon black, 7 parts of plasticizer, 3.5 parts of antioxidant, 2.2 parts of accelerator and 2 parts of vulcanizing agent.

[0094] The styrene-butadiene rubber is styrene-butadiene rubber 1502.

[0095] The high structure carbon black has a specific surface area of 42-50 m 2 / g; and a pore volume of 110-130 cm 3 / 100g. Specifically, the high structure carbon black can be N550 and / or N774.

[0096] The plasticizer is a phthalate substance, such as dimethyl phthalate.

[0097] The antioxidant is a phenolic substance, such as tetrakis [beta-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol.

[0098] The accelerator is a sulfenamide accelerator, such as N-cyclohexyl-2-benzothiazole sulfenamide.

[0099] The vulcanizing agent is sulfur.

[0100] In some embodiments of the present application, the second middle rubber layer has a thickness of 0.4-0.8 mm, such as 0.6 mm.

[0101] In the present application, the second middle rubber layer is well adhered to the cord layer. The high structure carbon black increases the hardness and strength of the rubber compound. The second middle rubber layer, with a suitable thickness, can better protect the steel wire.

[0102] In some embodiments of the present application, the raw rubber of the outer rubber layer includes, and specifically consists of, butadiene styrene rubber and natural rubber. The mass ratio of the butadiene styrene rubber and the natural rubber is 40-60:40-60, such as 50:50.

[0103] In some embodiments of the present application, the outer rubber layer is prepared from raw materials including the following weight parts:

[0104] 40-60 parts of butadiene styrene rubber, 40-60 parts of natural rubber, 30-50 parts of high structure carbon black, 3-8 parts of plasticizer, 1-3 parts of adhesive, 2-3 parts of antioxidant, 3-5 parts of accelerator, and 2-3 parts of vulcanizing agent.

[0105] Specifically, the outer rubber layer is prepared from raw materials including the following weight parts:

[0106] 50 parts of butadiene styrene rubber, 50 parts of natural rubber, 40 parts of high structure carbon black, 5 parts of plasticizer, 2 parts of adhesive, 2.5 parts of antioxidant, 4 parts of accelerator, and 3 parts of vulcanizing agent.

[0107] The butadiene styrene rubber is butadiene styrene rubber 1502.

[0108] The high structure carbon black has a specific surface area of 42-50 m 2 / cm3; the pore volume is 110-130 cm3 / g 3 Specifically, the high-structure carbon black can be N550 and / or N774.

[0109] The plasticizer is a phthalate substance, such as dimethyl phthalate.

[0110] The adhesive is a melamine substance, such as hexamethoxymethyl melamine.

[0111] The antioxidant is a phenolic substance, such as tetrakis [beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester.

[0112] The accelerator is a sulfenamide accelerator, such as N-cyclohexyl-2-benzothiazole sulfenamide.

[0113] The vulcanizing agent is sulfur.

[0114] In some embodiments of the present application, the thickness of the outer rubber layer is 2.5-5 mm, such as 3 mm.

[0115] The outer rubber layer provided by the present application has wear resistance and aging resistance, can resist external friction, scratching and mechanical impact, and avoids direct exposure or damage of the internal reinforcing layer (such as the cord and the steel wire). In this working condition, the outer rubber layer can buffer external pressure, prevent sharp objects from piercing the hose, and prolong the service life.

[0116] In actual application, the rubber hose needs to be repeatedly bent due to working conditions. The ordinary steel wire is rigid and easy to break. In the present application, the spring steel wire can buffer stress and avoid stress concentration. When the hose is stretched, the spring steel wire can provide stronger structural support to avoid disconnection of the hose due to external pulling. The fatigue strength of the spring steel wire is higher than that of the ordinary steel wire, and the elastic support can avoid collapse caused by long-term deformation, thereby improving the service life of the pipe body.

[0117] In the present application, the bending radius of the rubber hose is 400-600 mm. The bending radius of the ordinary steel wire hose is more than 800 mm. The rubber hose of the present application can achieve a smaller bending radius.

[0118] In the present application, the pulling force of the rubber hose is more than 25 KN; the pulling force of the ordinary steel wire hose is not more than 15 KN.

[0119] The inner rubber tensile strength of the rubber hose in the present application is more than 19 MPa, and the drum abrasion value is 75-85 mm 3 , and the drum abrasion value is lower; the inner rubber tensile strength of the existing rubber hose is not more than 18 MPa, and the drum abrasion value is more than 100.

[0120] The service life of the rubber hose in the application is more than 30 days; while the service life of the common steel wire hose is 7 days, 15 days, etc., all of which are not more than 16 days.

[0121] The application further provides a preparation method of the rubber hose described above, comprising the following steps:

[0122] A) preparing an inner rubber sheet by using the raw material of the inner rubber layer, winding the inner rubber sheet on a core rod to obtain the inner rubber layer;

[0123] B) winding the cord fabric on the inner rubber layer to obtain the cord fabric layer;

[0124] C) preparing a first middle rubber sheet by using the raw material of the first middle rubber layer, winding the first middle rubber sheet on the cord fabric layer to obtain the first middle rubber layer;

[0125] D) winding the spring steel wire on the first middle rubber layer to obtain the steel wire winding layer;

[0126] E) preparing a second middle rubber sheet by using the raw material of the second middle rubber layer, winding the second middle rubber sheet on the steel wire winding layer to obtain the second middle rubber layer;

[0127] F) preparing an outer rubber sheet by using the raw material of the outer rubber layer, winding the outer rubber sheet on the second middle rubber layer, and vulcanizing to obtain the rubber hose.

[0128] Regarding step A):

[0129] The inner rubber sheet is prepared by using the raw material of the inner rubber layer, and the inner rubber sheet is wound on a core rod to obtain the inner rubber layer.

[0130] In some embodiments of the application, the preparation of the inner rubber sheet by using the raw material of the inner rubber layer comprises the following steps:

[0131] After the raw material of the inner rubber layer is mixed by an open mill, the rubber sheet is calendered to obtain the inner rubber sheet.

[0132] The roller temperature of the mixing is 50-60℃, and the time is 10-20 min, such as 15 min.

[0133] In some embodiments of the application, the thickness of the inner rubber sheet (i.e. the thickness of the inner rubber layer) is 1.5-3.0 mm, such as 2 mm.

[0134] In some embodiments of the application, the core rod is a steel tube, and the diameter is 46 mm.

[0135] In some embodiments of the application, the winding is spiral winding.

[0136] Regarding step B):

[0137] The cord fabric is wound on the inner rubber layer to obtain the cord fabric layer.

[0138] Specifically, it comprises:

[0139] The first ply Z is wound on the inner rubber layer, and the second ply S is wound on the first ply to obtain a ply layer.

[0140] Regarding step C):

[0141] The first middle rubber layer is prepared by using the raw material of the first middle rubber layer, and is wound on the ply layer to obtain the first middle rubber layer.

[0142] The raw material of the first middle rubber layer is mixed by an open mill and then calendered into a rubber sheet to obtain the first middle rubber sheet.

[0143] The roller temperature of the mixing is 60-70℃, and the time is 10-20 min, such as 15 min.

[0144] The thickness of the first middle rubber sheet (i.e. the thickness of the first middle rubber layer) is 0.4-0.8 mm, such as 0.6 mm.

[0145] Regarding step E):

[0146] The second middle rubber layer is prepared by using the raw material of the second middle rubber layer, and is wound on the steel wire winding layer to obtain the second middle rubber layer.

[0147] The raw material of the second middle rubber layer is mixed by an open mill and then calendered into a rubber sheet to obtain the second middle rubber sheet.

[0148] The roller temperature of the mixing is 80-90℃, and the time is 10-20 min, such as 15 min.

[0149] The thickness of the second middle rubber sheet (i.e. the thickness of the second middle rubber layer) is 0.4-0.8 mm, such as 0.6 mm.

[0150] Regarding step F):

[0151] The outer rubber layer is prepared by using the raw material of the outer rubber layer, and is wound on the second middle rubber layer to obtain the rubber hose after vulcanization.

[0152] The raw material of the outer rubber layer is mixed by an open mill and then calendered into a rubber sheet to obtain the outer rubber sheet.

[0153] The roller temperature of the mixing is 80-90℃, and the time is 10-20 min, such as 15 min.

[0154] The thickness of the outer rubber sheet (i.e. the thickness of the outer rubber layer) is 2.5-5 mm, such as 3 mm.

[0155] In order to further illustrate the present application, a rubber hose and a preparation method thereof provided by the present application are described in detail below in conjunction with examples, but they should not be understood as limiting the protection scope of the present application.

[0156] The raw materials used in the following examples are all commercially available.

[0157] Example 1

[0158] 1、 Inner rubber mix :

[0159] Raw rubber (styrene-butadiene rubber 1502 70 parts, natural rubber 30 parts) 100 parts;

[0160] Carbon black (N774) 65 parts;

[0161] Plasticizer (dimethyl phthalate) 7 parts;

[0162] Antioxidant (tetra [beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester) 4 parts;

[0163] Accelerator (N-cyclohexyl-2-benzothiazole sulfenamide) 2.5 parts;

[0164] Vulcanizing agent (sulfur) 1.5 parts.

[0165] After the inner rubber compound is mixed by an open mill (roll temperature 50-60℃, mixing time 15 min), a rubber sheet with a thickness of 2.0 mm is obtained by calendering.

[0166] The inner rubber sheet is spirally wound on a steel tube tire with a diameter of 46 mm to obtain an inner rubber layer (thickness 2.0 mm).

[0167] 2, the first cord (PET cord) Z is wound on the inner rubber layer, and the second cord (PET cord) S is wound on the first cord to obtain a cord layer; the linear diameter of the first cord and the second cord is 1 mm, the surface density is 100 g / m 2 , the thickness is 1 mm; the tensile strength of the first cord and the second cord is 800 MPa.

[0168] 3、 First intermediate rubber mix :

[0169] Raw rubber (styrene-butadiene rubber 1502 70 parts, natural rubber 30 parts) 100 parts;

[0170] Carbon black (N550) 50 parts;

[0171] Plasticizer (dimethyl phthalate) 7 parts;

[0172] Antioxidant (Tetrakis [beta-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol) 3.5 parts;

[0173] Accelerator (N-cyclohexyl-2-benzothiazole sulfenamide) 2.2 parts;

[0174] Vulcanizing agent (sulfur) 2 parts.

[0175] The first intermediate rubber material is mixed by an open mill (the roller temperature is 60-70℃, and the time is 15 min), and then calendered into a rubber sheet with a thickness of 0.6 mm to obtain a first intermediate rubber sheet; the first intermediate rubber sheet is wound on the said ply to obtain a first intermediate rubber layer (with a thickness of 0.6 mm).

[0176] 4、The spring steel wire (the diameter of the spring steel wire is 1.8 mm, the elastic modulus is 205 GPa, the stiffness is 8.53 N / mm, and the tensile strength is 1900 Mpa) is wound clockwise on the first intermediate rubber layer to obtain a steel wire winding layer; the spacing between adjacent steel wires in the winding is 15 mm, and the winding angle is 50°.

[0177] 5、 Second intermediate rubber mix :

[0178] Raw rubber (styrene-butadiene rubber 1502 50 parts, natural rubber 50 parts) 100 parts;

[0179] Carbon black (N550) 50 parts;

[0180] Plasticizer (dimethyl phthalate) 7 parts;

[0181] Antioxidant (Tetrakis [beta-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol) 3.5 parts;

[0182] Accelerator (N-cyclohexyl-2-benzothiazole sulfenamide) 2.2 parts;

[0183] Vulcanizing agent (sulfur) 2 parts.

[0184] The second intermediate rubber material is mixed by an open mill (the roller temperature is 80-90℃, and the time is 15 min), and then calendered into a rubber sheet with a thickness of 0.6 mm to obtain a second intermediate rubber sheet; the second intermediate rubber sheet is wound on the steel wire winding layer to obtain a second intermediate rubber layer (with a thickness of 0.6 mm).

[0185] 6、 Outer rubber mix :

[0186] Raw rubber (styrene-butadiene rubber 1502 50 parts, natural rubber 50 parts) 100 parts;

[0187] Carbon black (N550) 40 parts;

[0188] Plasticizer (dimethyl phthalate) 5 parts;

[0189] Adhesive (hexamethoxymethyl melamine) 2 parts;

[0190] Antioxidant (tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester) 2.5 parts;

[0191] Accelerator (N-cyclohexyl-2-benzothiazole sulfenamide) 4 parts;

[0192] Vulcanizing agent (sulfur) 3 parts.

[0193] After the outer rubber compound is mixed by an open mill (the roller temperature is 80-90℃, and the time is 15 min), a rubber sheet with a thickness of 3 mm is obtained by calendering; the outer rubber sheet is wound on the second middle rubber layer, and after vulcanization, an outer rubber layer (thickness of 3 mm) is obtained, thereby obtaining a rubber hose.

[0194] Example 2

[0195] The difference from Example 1 is that:

[0196] In step 4, a spring steel wire (the diameter of the spring steel wire is 1.6 mm, the elastic modulus is 200 GPa, the stiffness is 8 N / mm, and the tensile strength is 1800 Mpa) is wound clockwise on the first middle rubber layer to obtain a steel wire winding layer; the spacing between adjacent steel wires in winding is 15 mm, and the winding angle is 50°.

[0197] The remaining steps are the same as those in Example 1, and a rubber hose is prepared.

[0198] Example 3

[0199] The difference from Example 1 is that:

[0200] In step 4, a spring steel wire (the diameter of the spring steel wire is 2.2 mm, the elastic modulus is 210 GPa, the stiffness is 9 N / mm, and the tensile strength is 2000 Mpa) is wound clockwise on the first middle rubber layer to obtain a steel wire winding layer; the spacing between adjacent steel wires in winding is 15 mm, and the winding angle is 50°.

[0201] The remaining steps are the same as those in Example 1, and a rubber hose is prepared.

[0202] Comparative Example 1

[0203] The difference from Example 1 is that a common steel wire (not a spring steel wire) is used;

[0204] In step 4, the steel wire (the diameter of the spring steel wire is 1.8 mm and the stiffness is 8.53 N / mm) is wound clockwise around the first intermediate adhesive layer to obtain a steel wire winding layer; the spacing between adjacent steel wires during winding is 15 mm and the winding angle is 50°.

[0205] The remaining steps are the same as in Example 1, and a rubber hose is obtained.

[0206] The performance of the rubber hoses of Examples 1-3 and Comparative Example 1 was tested, and the test results are shown in Table 1.

[0207] Table 1 Performance test results of rubber hoses in Examples 1-3 and Comparative Example 1

[0208]

[0209] The descriptions of the above embodiments are merely illustrative of the methods and core ideas of the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rubber hose, comprising, from the inside to the outside along the pipe diameter direction: Inner adhesive layer; The fabric layer formed on the inner adhesive layer; A first intermediate adhesive layer formed on the fabric layer; A steel wire winding layer is formed on the first intermediate adhesive layer; the steel wires in the steel wire winding layer are spring steel wires; the spring steel wires form a spiral support structure; A second intermediate adhesive layer is formed on the wire winding layer; An outer adhesive layer formed on the second middle adhesive layer.

2. The rubber hose according to claim 1, characterized in that, The diameter of the spring steel wire is 1.5~2.3 mm; The elastic modulus of the spring steel wire is 200~210 GPa, the stiffness is 8~9 N / mm, and the tensile strength is 1700~2100 MPa.

3. The rubber hose according to claim 1, characterized in that, The spacing between adjacent wires in the winding of the spring steel wire is 9~25 mm, and the winding angle is 45°~54°.

4. The rubber hose according to claim 1, characterized in that, The curtain layer is a double-layer curtain, including a first curtain and a second curtain, and the first curtain and the second curtain are wound in different directions; The first curtain is wound in the Z direction, and the second curtain is wound in the S direction.

5. The rubber hose according to claim 1, characterized in that, The first and second curtain fabrics have a wire diameter of 0.9~1.1 mm and a surface density of 80~120 g / m². 2 ; The materials of the first and second curtain fabrics are independently selected from polyester or nylon, with a tensile strength of 773~910 MPa; The thickness of the first curtain fabric is 0.8~1.2 mm; the thickness of the second curtain fabric is 0.8~1.2 mm.

6. The rubber hose according to claim 1, characterized in that, The inner adhesive layer is prepared from raw materials comprising the following parts by weight: 60-80 parts styrene-butadiene rubber, 20-40 parts natural rubber, 55-75 parts high-structure carbon black, 3-10 parts plasticizer, 2-6 parts antioxidant, 1-5 parts accelerator and 1.0-1.8 parts vulcanizing agent; The thickness of the inner adhesive layer is 1.5~3.0 mm.

7. The rubber hose according to claim 1, characterized in that, The first intermediate adhesive layer is prepared from raw materials comprising the following parts by weight: 40-60 parts styrene-butadiene rubber, 40-60 parts natural rubber, 40-60 parts high-structure carbon black, 3-10 parts plasticizer, 2-6 parts antioxidant, 1-4 parts accelerator and 1.5-2.5 parts vulcanizing agent; The thickness of the first adhesive layer is 0.4~0.8 mm.

8. The rubber hose according to claim 1, characterized in that, The second intermediate adhesive layer is prepared from raw materials comprising the following parts by weight: 40-60 parts styrene-butadiene rubber, 40-60 parts natural rubber, 40-60 parts high-structure carbon black, 3-10 parts plasticizer, 2-6 parts antioxidant, 1-4 parts accelerator and 1.5-2.5 parts vulcanizing agent; The thickness of the second adhesive layer is 0.4~0.8 mm.

9. The rubber hose according to claim 1, characterized in that, The outer adhesive layer is prepared from raw materials comprising the following parts by weight: 40-60 parts styrene-butadiene rubber, 40-60 parts natural rubber, 30-50 parts high-structure carbon black, 3-8 parts plasticizer, 1-3 parts adhesive, 2-3 parts antioxidant, 3-5 parts accelerator and 2-3 parts vulcanizing agent; The thickness of the outer adhesive layer is 2.5~5 mm.

10. A method for preparing the rubber hose according to any one of claims 1 to 9, comprising the following steps: A) Prepare an inner adhesive sheet using the raw material of the inner adhesive layer, and wind it onto the mandrel to obtain the inner adhesive layer; B) Wrap the curtain fabric around the inner adhesive layer to obtain the curtain fabric layer; C) Prepare a first intermediate adhesive film using the raw materials of the first intermediate adhesive layer, and wind it onto the fabric layer to obtain the first intermediate adhesive layer; D) Wind the spring steel wire around the first intermediate adhesive layer to obtain a steel wire winding layer; E) Prepare a second intermediate adhesive sheet using the raw materials of the second intermediate adhesive layer, and wind it onto the steel wire winding layer to obtain the second intermediate adhesive layer; F) Prepare an outer rubber sheet using the raw material of the outer rubber layer, wrap it around the second middle rubber layer, and vulcanize it to obtain a rubber hose.

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