阅读说明：本技术 橡胶胶管及其制备方法 (Rubber hose and preparation method thereof ) 是由 王志方 刘元浩 华欣倩 赵玉明 薛俊芳 于 2021-11-08 设计创作，主要内容包括：本发明提供了一种橡胶胶管及其制备方法,涉及胶管制备技术领域。所述橡胶胶管由内至外依次包括内胶层、纤维增强层和外胶层；其中,所述内胶层胶料中的增塑剂为石蜡油,所述石蜡油中Ca的分子量6～8％,即小分子较为活跃的增塑剂；加入上述增塑剂的内胶层经过高温烘烤会向内胶胶管表面运动,使内管表面油性较大；所以,内管加热后再通过外胶挤出机时,内管的状态就是高温偏软且表面具备一定油性,可以很好的保证产品的内外胶粘接性。(The invention provides a rubber hose and a preparation method thereof, and relates to the technical field of rubber hose preparation. The rubber hose sequentially comprises an inner rubber layer, a fiber reinforced layer and an outer rubber layer from inside to outside; the plasticizer in the inner rubber layer rubber material is paraffin oil, and the molecular weight of Ca in the paraffin oil is 6-8%, namely the plasticizer with active small molecules; the inner rubber layer added with the plasticizer can move to the surface of the inner rubber hose after being baked at high temperature, so that the surface of the inner pipe has higher oiliness; therefore, when the inner pipe is heated and then passes through the outer glue extruder, the inner pipe is in a state that the inner pipe is soft at high temperature and the surface of the inner pipe has certain oiliness, so that the inner and outer glue adhesiveness of the product can be well ensured.)

1. The rubber hose is characterized by comprising an inner rubber layer, a fiber reinforced layer and an outer rubber layer from inside to outside in sequence;

the plasticizer in the inner rubber layer rubber material is paraffin oil, and the molecular weight of Ca in the paraffin oil is 6-8%.

2. The rubber hose of claim 1, wherein the rubber species of the inner rubber layer comprises one of ethylene propylene diene monomer, fluororubber, silicone rubber, fluorosilicone rubber, nitrile rubber, chloroprene rubber, NBR/PVC rubber, chlorosulfonated polyethylene rubber, acrylate rubber, ethylene-acrylate rubber, chlorinated polyethylene rubber, styrene-butadiene rubber, butyl rubber, chlorinated butyl rubber, hydrogenated nitrile rubber;

preferably, the rubber species of the outer rubber layer comprises one of ethylene propylene diene monomer, fluororubber, silicone rubber, fluorosilicone rubber, nitrile rubber, chloroprene rubber, NBR/PVC rubber, chlorosulfonated polyethylene rubber, acrylate rubber, ethylene-acrylate rubber, chlorinated polyethylene rubber, styrene butadiene rubber, butyl rubber, chlorinated butyl rubber and hydrogenated nitrile rubber;

preferably, the glue species of the inner glue layer and the outer glue layer are the same.

3. The rubber hose according to claim 1, wherein the content of the plasticizer in the inner rubber layer is 8-15%.

4. The rubber hose of claim 1, wherein the fiber-reinforced layer is woven from nylon threads, aramid threads, or polyester threads;

preferably, the weaving method of the fiber reinforced layer comprises at least one of plain knitting, lock knitting and winding.

5. The method for preparing the rubber hose according to any one of claims 1 to 4, wherein the method comprises the following steps:

extruding an inner rubber layer on a mold core, weaving a fiber reinforced layer on the inner rubber layer after cooling, then carrying out heat treatment, and then extruding an outer rubber layer on the fiber reinforced layer to obtain the rubber hose.

6. The method for manufacturing a rubber hose according to claim 5, wherein a heat source for the heat treatment includes infrared heating, thermocouple heating, or hot air heating.

7. The method for preparing the rubber hose according to claim 6, wherein the surface temperature of the inner rubber layer after the heat treatment is 90-100 ℃.

8. The method for manufacturing the rubber hose according to claim 6, wherein the temperature of the heat source is 500-600 ℃.

9. The method for manufacturing a rubber hose according to claim 5, wherein the fiber reinforced layer and the outer rubber layer are provided in plurality and alternately.

10. The method for manufacturing a rubber hose according to claim 5, wherein the rubber hose is an elbow pipe or a special pipe.

Technical Field

The invention relates to the technical field of rubber hose preparation, in particular to a rubber hose and a preparation method thereof.

Background

At present, pipelines produced by various materials and processes are all of three-layer or more than three-layer structures, the main reason is that in order to ensure the pressure-bearing performance of products, a layer of enhancement layer needs to be added, the material of the enhancement layer does not have any compatibility with rubber materials, so that inner and outer rubber is caused to exist due to the enhancement layer, the bonding performance is poor, the existing solution is that the inner rubber is produced, and after the weaving process of the enhancement layer is completed, chemical additives are sprayed, the surface of the inner rubber is dissolved and differentiated, after the inner rubber is dissolved, part of the rubber material penetrates through gaps of the enhancement layer to be contacted and adhered with the outer rubber, the firm adhesion between the three-layer structures of the products is ensured, and the three-layer structures cannot be separated or delaminated.

Specifically, the existing rubber tube production line mainly comprises 7 steps of inner rubber extrusion, inner rubber cooling, weaving layer, chemical auxiliary spraying, outer rubber extrusion, outer cross cooling and fixed-length cutting. Wherein, the process of spraying the chemical auxiliary agent is to improve the adhesive force and ensure that the inner glue and the outer glue can be effectively bonded. The existing production process and production line can be divided into a continuous type and a segmented type, rubber tube products such as a cooling water tube of a plain needle process, a turbo-charging tube of the plain needle process, a turbo-charging tube of a locking needle process and the like belong to continuous production, the production can comprise all production steps at one time, and the production process is continuous and uninterrupted; other processes such as weaving process cooling water pipe or weaving process fuel oil pipe are all produced in a segmented mode, namely inner glue extrusion and inner glue cooling are the first step, the weaving layer is the second part, and spraying chemical auxiliary agent, extruding outer glue layer, cooling and fixed-length cutting are the third part; however, in any process or production line, the inner tube is cooled after the inner rubber is extruded, and the coating process of the braided layer is performed, so that the problem that the inner rubber tube is too soft due to the overhigh temperature of the inner rubber layer, the braided layer draws traces, and the hardness of the cooled inner tube is increased is solved.

The chemical auxiliary agent in the traditional process can soften and corrode the rubber in the inner pipe after being sprayed, so that the rubber is melted and gathered at the middle gap of the wire layer, and can be melted and bonded with the outer rubber when being coated, thereby achieving good inner and outer adhesive bonding performance. If the link of spraying the chemical auxiliary agent is directly removed, the inner pipe is extruded and then is directly coated with the outer glue through two procedures of cooling and weaving, and because the inner glue layer is hard and cold, the compatibility is poor, and the inner glue layer and the outer glue layer cannot have good adhesion. However, the above-mentioned attachment method of the chemical auxiliary has the following disadvantages: 1. the existing spraying auxiliary agents are all chemical products synthesized in chemical industry, can volatilize trace toxic and harmful gases in the using process, have risks in the storing and transporting processes and belong to dangerous raw materials. 2. The used residue and waste liquid of the chemical auxiliary agent belong to toxic and harmful substances, and can be discharged only after special treatment, resources such as water, electricity and the like are consumed in the process, and the environment is greatly polluted once leakage occurs.

In view of the above, it is necessary and urgent to develop a novel rubber pipeline production process to solve the problem of large environmental pollution caused by the production of chemical additives in the existing rubber hose production process.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The first purpose of the invention is to provide a rubber hose, wherein the surface of an inner pipe of the rubber hose has high oiliness, and the inner pipe can be well ensured to be bonded with the outer glue when passing through an outer glue extruder after being heated.

The second purpose of the invention is to provide a preparation method of the rubber hose, which has the advantages of simple process setting, easy operation and environmental friendliness.

In order to achieve the above purpose of the present invention, the following technical solutions are adopted:

the rubber hose provided by the invention comprises an inner rubber layer, a fiber reinforced layer and an outer rubber layer from inside to outside in sequence;

the plasticizer in the inner rubber layer rubber material is paraffin oil, and the molecular weight of Ca in the paraffin oil is 6-8%.

Further, the rubber species of the inner rubber layer comprises one of ethylene propylene diene monomer, fluororubber, silicone rubber, fluorosilicone rubber, nitrile rubber, chloroprene rubber, NBR/PVC rubber, chlorosulfonated polyethylene rubber, acrylate rubber, ethylene-acrylate rubber, chlorinated polyethylene rubber, styrene butadiene rubber, butyl rubber, chlorinated butyl rubber and hydrogenated nitrile rubber;

preferably, the rubber species of the outer rubber layer comprises one of ethylene propylene diene monomer, fluororubber, silicone rubber, fluorosilicone rubber, nitrile rubber, chloroprene rubber, NBR/PVC rubber, chlorosulfonated polyethylene rubber, acrylate rubber, ethylene-acrylate rubber, chlorinated polyethylene rubber, styrene butadiene rubber, butyl rubber, chlorinated butyl rubber and hydrogenated nitrile rubber;

preferably, the glue species of the inner glue layer and the outer glue layer are the same.

Further, the content of the plasticizer in the inner rubber layer is 8-15%.

Furthermore, the fiber reinforced layer is mainly woven by nylon threads, aramid threads or polyester threads;

preferably, the weaving method of the fiber reinforced layer comprises at least one of plain knitting, lock knitting and winding.

The invention provides a preparation method of the rubber hose, which comprises the following steps:

extruding an inner rubber layer on a mold core, weaving a fiber reinforced layer on the inner rubber layer after cooling, then carrying out heat treatment, and then extruding an outer rubber layer on the fiber reinforced layer to obtain the rubber hose.

Further, the heat source of the heat treatment comprises infrared heating, thermocouple heating or hot air heating.

Further, the surface temperature of the inner rubber layer after heat treatment is 90-100 ℃.

Further, the temperature of the heat source is 500-600 ℃.

Furthermore, the fiber reinforced layers and the outer glue layers are multiple and are arranged alternately.

Furthermore, the rubber hose is a bent pipe or a special pipe.

Compared with the prior art, the invention has the beneficial effects that:

the rubber hose provided by the invention comprises an inner rubber layer, a fiber reinforced layer and an outer rubber layer from inside to outside in sequence; the plasticizer in the inner rubber layer rubber material is paraffin oil, and the molecular weight of Ca in the paraffin oil is 6-8%, namely the plasticizer with active small molecules; the inner rubber layer added with the plasticizer can move to the surface of the inner rubber hose after being baked at high temperature, so that the surface of the inner pipe has higher oiliness; therefore, when the inner pipe is heated and then passes through the outer glue extruder, the inner pipe is in a state that the inner pipe is soft at high temperature and the surface of the inner pipe has certain oiliness, so that the inner and outer glue adhesiveness of the product can be well ensured.

The preparation method of the rubber hose provided by the invention comprises the steps of firstly extruding an inner rubber layer on a mold core, weaving a fiber reinforced layer on the inner rubber layer after cooling, then carrying out heat treatment, and then extruding an outer rubber layer on the fiber reinforced layer to obtain the rubber hose. Compared with the existing method for spraying chemical auxiliary agents to change the form of the inner pipe so as to achieve the bonding effect, the method for spraying the chemical auxiliary agents to the inner pipe has the advantages that the state of the inner pipe and the outer glue are well compatible by changing the state of the product, such as temperature, hardness, surface oiliness and the like, and the process is simple in process setting, easy to operate and environment-friendly.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a process flow for preparing a rubber hose by using an infrared heating source according to embodiment 1 of the present invention;

FIG. 2 is a schematic view of a process flow for preparing a rubber hose by using a thermocouple heating source according to embodiment 2 of the present invention;

FIG. 3 is a schematic view of a process flow for preparing a rubber hose by a hot air heating source according to embodiment 3 of the present invention;

FIG. 4 is a schematic view of a process flow for preparing a rubber hose by using a chemical additive spraying method in the prior art according to comparative example 1 of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

According to one aspect of the invention, the rubber hose comprises an inner rubber layer, a fiber reinforced layer and an outer rubber layer from inside to outside in sequence;

the plasticizer in the inner rubber layer rubber material is paraffin oil, and the molecular weight of Ca in the paraffin oil is 6-8%.

The rubber hose provided by the invention comprises an inner rubber layer, a fiber reinforced layer and an outer rubber layer from inside to outside in sequence; the plasticizer in the inner rubber layer rubber material is paraffin oil, and the molecular weight of Ca in the paraffin oil is 6-8%, namely the plasticizer with active small molecules; the inner rubber layer added with the plasticizer is baked at high temperature, and under the condition of short-time high temperature, the plasticizer can rapidly move to the surface of the inner rubber layer, so that the surface of the inner pipe has higher oiliness; therefore, when the inner pipe is heated and then passes through the outer glue extruder, the inner pipe is in a state that the inner pipe is soft at high temperature and the surface of the inner pipe has certain oiliness, so that the inner and outer glue adhesiveness of the product can be well ensured.

In a preferred embodiment of the present invention, the rubber species of the inner rubber layer comprises one of ethylene propylene diene monomer, fluororubber, silicone rubber, fluorosilicone rubber, nitrile rubber, chloroprene rubber, NBR/PVC rubber, chlorosulfonated polyethylene rubber, acrylate rubber, ethylene-acrylate rubber, chlorinated polyethylene rubber, styrene-butadiene rubber, butyl rubber, chlorinated butyl rubber, hydrogenated nitrile rubber;

preferably, the rubber species of the outer rubber layer comprises one of ethylene propylene diene monomer, fluororubber, silicone rubber, fluorosilicone rubber, nitrile rubber, chloroprene rubber, NBR/PVC rubber, chlorosulfonated polyethylene rubber, acrylate rubber, ethylene-acrylate rubber, chlorinated polyethylene rubber, styrene butadiene rubber, butyl rubber, chlorinated butyl rubber and hydrogenated nitrile rubber;

as a preferred implementation mode, the glue types of the inner glue layer and the outer glue layer are the same, the process can be used for the same glue type formula, the effect is very good, and the process can also be used for the combination of part of different glue types, so that the effect is very good.

In a preferred embodiment of the present invention, the content of the plasticizer in the inner rubber layer is 8 to 15%.

As a preferred embodiment, when the plasticizer of the inner layer adhesive is selected, small-molecule paraffin oil is selected to ensure that the oil can be uniformly and stably moved outwards, meanwhile, the content of the plasticizer in the inner adhesive is approximately 8% to 15%, the dosage of the plasticizer also needs to be controlled, if the plasticizer is too much or lacks corresponding inorganic filler for absorption and fusion, the paraffin oil moving outwards is too much, a thick oil layer can be formed on the surface of the inner layer adhesive, after the outer adhesive is wrapped, a long time is needed for volatilization or re-fusion into the adhesive material, the fusion and viscosity of the inner layer and the outer layer can be reduced, and the stiffness and viscosity of the inner adhesive can be reduced due to too much dosage of the plasticizer; in addition, if the amount of plasticizer used is too small, the oil is secreted too little at high temperatures, and effective adhesion cannot be achieved.

In a preferred embodiment of the present invention, the fiber reinforced layer is mainly woven from nylon thread, aramid thread or polyester thread;

preferably, the weaving method of the fiber reinforced layer comprises at least one of plain knitting, lock knitting and winding.

According to one aspect of the invention, the preparation method of the rubber hose comprises the following steps:

extruding an inner rubber layer on a mold core, weaving a fiber reinforced layer on the inner rubber layer after cooling, then carrying out heat treatment, and then extruding an outer rubber layer on the fiber reinforced layer to obtain the rubber hose.

The preparation method of the rubber hose provided by the invention comprises the steps of firstly extruding an inner rubber layer on a mold core, weaving a fiber reinforced layer on the inner rubber layer after cooling, then carrying out heat treatment, and then extruding an outer rubber layer on the fiber reinforced layer to obtain the rubber hose. Compared with the existing method for spraying chemical auxiliary agents to change the form of the inner pipe so as to achieve the bonding effect, the method for spraying the chemical auxiliary agents to the inner pipe has the advantages that the state of the inner pipe and the outer glue are well compatible by changing the state of the product, such as temperature, hardness, surface oiliness and the like, and the process is simple in process setting, easy to operate and environment-friendly.

Preferably, the preparation method of the rubber hose can divide a production line into two times or even three times; after the inner tube production is accomplished, twine the inner tube on a big dabber, follow-up weaving the inner tube alone, go up the rod again, take away the cladding alone to the product of weaving again and glue outward, in the production process of this technology, the product of going up the roller can be deposited in independent high temperature chamber after the deposit in high temperature chamber makes the inner tube reach the uniform temperature, directly accomplishes the cladding work of extruding of gluing outward in high temperature chamber, also can have certain promotion to the adhesion.

In a preferred embodiment of the present invention, the heat source for the heat treatment includes infrared heating, thermocouple heating, or hot air heating.

Wherein, infrared heating, the inside circular drying tunnel of adopting the PVC material preparation of equipment ensures that the heat is effective to be transmitted and heat distributes evenly.

The thermocouple heating, the inside circular drying tunnel of adopting ceramic material preparation of equipment ensures that the heat is effective to be transmitted and heat distributes evenly.

The hot air heating, the inside intensive even air-out that adopts many cavitys of equipment, body direct contact hot air, the inside long and narrow and heat preservation of equipment.

Preferably, infrared heating production facility includes, at inside circumference to installation infrared heating pipe, make the product surface temperature through equipment inside rise through infrared heating, the circular drying tunnel of inside preparation PVC material, ensure that the rubber tube is heated evenly and do not influence heat transfer, treat the product surface softening back, because used the comparatively active plasticizer of micromolecule in the internal glue, can inwards glue rubber tube surface motion through high temperature baking, it is great to make inner tube surface oil, when gluing the extruder outside through, the state of inner tube is exactly that the high temperature is soft and the surface possesses certain oil, the inside and outside adhesive bonding nature of assurance product that can be fine.

Preferably, the thermocouple heating production equipment comprises thermocouple heating wires which are uniformly arranged in the thermocouple heating production equipment, a round ceramic material heating drying tunnel is manufactured, and the thermocouple heating wires are uniformly distributed and arranged on the ceramic drying tunnel to ensure effective and uniform transmission of heat;

preferably, the hot air heating production equipment comprises a hot air outlet which is uniformly arranged in the equipment, a hot air port does not directly blow the surface of a product, the side face blows air, a high-temperature environment is manufactured, the length of a drying tunnel in the equipment is 2 meters, and the two ends of the equipment and the drying tunnel are subjected to heat preservation and sealing treatment.

In a preferred embodiment of the present invention, the surface temperature of the inner rubber layer after the heat treatment is 90 to 100 ℃.

In a preferred embodiment of the present invention, the temperature of the heat source is 500 to 600 ℃.

As a preferred embodiment, in the heat treatment process, the temperature of the heat source is controlled to be 600 ℃, and the product passes through the environment, so that the surface temperature can be rapidly increased to 90-100 ℃, the softening temperature of the product is at the same level as the softening temperature of the outer layer rubber material coated on the inner pipe, the temperature of the inner rubber material and the temperature of the outer rubber material are equivalent, and the compatibility can be further improved; in the thermocouple heating method, because the ceramic has excellent thermal conductivity, the surface temperature of the product can be ensured to reach 90-100 ℃ by setting the temperature at 500 ℃, and the bonding is ensured to be qualified; the hot air heating method has no intermediate heat insulating layer and can directly act on the product, so that the hot air heat source of the equipment can meet the requirement by controlling the temperature to be 200 ℃, and the qualified bonding force is ensured.

Preferably, the temperature of a heat source of the heating equipment is controlled at 600 ℃, so that the surface temperature of the product can reach 90-100 ℃ in a drying tunnel with the circumference diameter of 15 cm.

In a preferred embodiment of the present invention, the fiber reinforced layers and the outer glue layers are a plurality of and alternately arranged.

In a preferred embodiment of the present invention, the rubber hose is an elbow or a special pipe.

The technical solution of the present invention will be further described with reference to the following examples.

Example 1:

a preparation method of a rubber hose comprises the following steps:

(1) extruding an inner adhesive layer on the mold core, and cooling to obtain the inner adhesive layer; then winding the inner tube on a large mandrel, subsequently weaving the single inner tube, and then putting on a stick to obtain the inner rubber tube coated with the fiber reinforced layer;

the inner rubber layer is made of EPDM, the plasticizer is petroleum wax with the molecular weight of 6% -8%, and the content of the plasticizer is 15 parts;

the fibers of the woven fiber reinforced layer are aramid fiber wires with the size of 1100 date;

the specific extrusion process of the woven product is as follows: the extrusion of the belt core of the inner pipe is firstly finished, the speed is about 10m/min, the upper roller is cooled for standby application, then the inner pipe is subjected to weaving and coating of the reinforcing layer, the speed is 6m/min, the upper roller is standby application, and finally, after the pretreatment and heating of the inner pipe coated with the reinforcing layer, the outer rubber coating is carried out, and the speed is about 15 m/min.

(2) Carrying out heat treatment on the inner rubber tube coated with the fiber reinforced layer, and then extruding an outer rubber layer on the fiber reinforced layer to obtain a rubber tube;

the rubber seed of the outer rubber layer is EPDM, the plasticizer is petroleum wax with the molecular weight of 6% -8%, and the content of the plasticizer is 10 parts;

as shown in fig. 1, the heat source for the heat treatment in this embodiment is an infrared heating heat source, wherein the infrared temperature is controlled at 600 ℃, and the temperature of the surface of the inner rubber tube coated with the fiber reinforced layer can be rapidly raised to 90-100 ℃ when the product passes through the environment, and is at the same level as the softening temperature of the outer rubber coated on the inner tube, and the temperature of the inner rubber and the temperature of the outer rubber are equivalent, so that the compatibility can be further improved.

Example 2

A preparation method of a rubber hose comprises the following steps:

(1) the same as in example 1;

(2) carrying out heat treatment on the inner rubber tube coated with the fiber reinforced layer, and then extruding an outer rubber layer on the fiber reinforced layer to obtain a rubber tube;

the glue species of the outer glue layer is the same as that of the embodiment 1;

as shown in fig. 2, the heat source for the heat treatment in this embodiment is a thermocouple heating heat source, wherein the thermocouple heating method can ensure that the surface temperature of the product reaches 90 to 100 ℃ and the adhesion is qualified by setting the temperature at 500 ℃ because the ceramic has excellent thermal conductivity.

Example 3

A preparation method of a rubber hose comprises the following steps:

(1) the same as in example 1;

(2) carrying out heat treatment on the inner rubber tube coated with the fiber reinforced layer, and then extruding an outer rubber layer on the fiber reinforced layer to obtain a rubber tube;

the glue species of the outer glue layer is the same as that of the embodiment 1;

as shown in fig. 3, the heat source for heat treatment in this embodiment is a hot air heating heat source, wherein the hot air heating method, without an intermediate heat insulating layer, can directly act on the product, so that the hot air heat source of the apparatus can meet the requirement by controlling the temperature at 200 ℃, and the adhesion is ensured to be qualified.

Comparative example 1

FIG. 4 is a schematic view of a process for preparing a rubber hose by using a chemical additive spraying method in this comparative example;

a preparation method of a rubber hose comprises the following steps:

(1) the same as in example 1;

(2) spraying a chemical auxiliary agent on the inner rubber tube coated with the fiber reinforced layer, and then extruding an outer rubber layer on the fiber reinforced layer to obtain a rubber tube;

the rubber seed of the outer rubber layer is EPDM;

the chemical auxiliary agent spraying method comprises the following specific process steps: extruding inner glue, cooling, weaving layer, directly spraying chemical assistant, and coating outer glue.

Comparative example 2

A preparation method of a rubber hose comprises the following steps:

(1) the same as in example 1;

(2) and directly extruding an outer rubber layer on the inner rubber pipe coated with the fiber reinforced layer to obtain the rubber pipe.

Comparative example 3

The preparation method of the rubber hose is the same as that of the example 1 except that the plasticizer of the inner rubber layer in the step (1) is white oil.

Comparative example 4

The preparation method of the rubber hose is the same as that of the example 1 except that the plasticizer in the inner rubber layer in the step (1) is petroleum wax, and the molecular weight of Ca in the paraffin oil is 18-25%.

Experimental example 1

In order to show that the rubber hose prepared by the method has good ageing resistance, cooling resistance and tolerance, the rubber hoses prepared by the embodiments 1-3 and the comparative examples 1 and 2 are subjected to performance detection, and the specific results are shown in the following table:

the rubber hose prepared by the heat treatment method has the same performance as the rubber hose prepared by the chemical spraying method in the comparative example 1, and no harmful gas or toxic waste liquid is generated in the preparation process, so that the rubber hose is environment-friendly; in contrast to the technical scheme of the comparative example 2 in which the outer adhesive layer is directly coated, the inner adhesive layer is hard and cold, so that the compatibility is poor, and the inner adhesive layer and the outer adhesive layer are not well adhered. The white oil of comparative example 3, however, has no bonding effect, but gradually volatilizes with time and temperature, and does not contribute to the bonding performance, although it appears on the inner tube after passing through high temperature due to the characteristics of low kinematic viscosity, short molecular chain, no polymerization, etc. of the oil itself; the paraffin oil with larger molecular weight is replaced in the comparative example 4, the motion effect is not obvious in the short-time heating process due to the overlarge molecular weight of the paraffin oil, the surface of the inner pipe is basically not changed, and the bonding effect of the inner glue and the outer glue is not obviously improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.