CN202032193U - Hose and hose component - Google Patents

Abstract

The utility model relates to a hose and hose components. The hose comprises at least one hose core layer, at least one outer coating layer and a single-layered fiber reinforcing layer arranged between the hose core layer and the outer coating layer. The fiber reinforcing layer comprises composite ropes twisted by at least one strand of contraposition aromatic polyamide fiber and at least one strand of high elongation fiber. The hose of the utility model exhibits high anti-cracking pressure and fine volume expansibility.

Description

Flexible pipe and hose

Technical field

The utility model relates to flexible pipe, specifically, relates to the flexible pipe of the compound rope enhancing of apparatus para-aramid fiber, and described flexible pipe has high anticracking pressure and good volumetric expansion, is suitable as power steering tube.

Background technique

In recent years, along with developing rapidly of automotive industry, flexible pipe is widely used in multiple automobile component for transport tape press liquid or gas, for example, and vehicle radiator and heater hose, air conditioning hose, brake hose and power steering tube etc.Usually these hoses comprise one deck die layer, one or more layers enhancement layer and the outer covering layer of one deck at least on described enhancement layer.Described enhancement layer adopts the cotton rope of artificial fiber or wire material to form usually, these cotton ropes with knitting, woven, weave or be spirally wound on the resistance to pressure that increases flexible pipe on the described die layer.The die layer of described flexible pipe and outer covering layer adopt thermoplastic resin usually or are formed by elastic substrate.To middle pressure flexible pipe, (the Vinylon fiber is as described enhancement layer material to adopt polyester, nylon, cellulose ester or vinylon usually for low pressure.For high pressure or extreme pressure hose, then use to have high-intensity fiber, for example, para-aramid and steel wire etc.

But the enhancement layer material that is used for power steering tube (a kind of high-pressure oil pipe) but preferably uses nylon fiber.Because power steering tube is in the starting stage of pressurized, but the interior pressure that moment raises is alleviated in the expansion of the formed enhancement layer mat of nylon fiber body.SAE J188 regulation, the power steering tube of I type need satisfy the volumetric expansion requirement of minimum 3cc/foot and maximum 8cc/foot; The power steering tube of II type need satisfy the volumetric expansion requirement of minimum 8cc/foot and maximum 17cc/foot.

U.S. Patent application 2008/0314470 discloses a kind of flexible pipe that is applicable to servosteering, and described flexible pipe comprises die layer, outer covering layer and one deck fiber-reinforced layer, but does not get rid of the structure more than one deck enhancement layer; Described flexible pipe adopts the material of resistant to elevated temperatures thermoplastic resin as its die layer and outer covering layer, and the optimum fiber that is used for enhancement layer then is the nylon fiber at 3600 dawn.

But because power steering tube needs to satisfy high pressure resistant requirement simultaneously, the enhancement layer of one deck nylon fiber can't satisfy this high pressure resistant requirement, and the industrial practical application of result has to use two-layer at least nylon fiber layer to reach high pressure resistant requirement.SAE J188 standard code, power steering tube need adopt the enhancement layer of two-layer fiber weave structure to satisfy the anticracking pressure requirement of 41.4MPa.

U.S. Pat 7,614,428B2 discloses power steering tube and has adopted the two-layer enhancement layer that is formed by nylon or braided polyester.Other are U.S. Pat 4,273,160 and US6 for example, and 631,742 also disclose the power steering tube that uses two-layer fiber-reinforced layer similarly.

From view of function, the problem of load transfer often takes place in two-layer fiber-reinforced layer.If the material of two-layer fiber-reinforced layer and weaving manner are just the same, internal layer bears more load than skin usually, and outer its effect of 50% of only having brought into play.In order to solve the problem of load transfer, U.S. Pat 5,660,210 disclose to use and have had two-layer fiber-reinforced layer of different nature, and wherein internal layer makes load can be transferred to skin than the easier stretching, extension of skin thus.U.S. Pat 4,273,160 disclose the similar techniques scheme.But these technological schemes can increase processing and production difficulty on the material.In addition, for guaranteeing that two-layer enhancement layer can average mark undertakes lotus and need take very harsh process parameter.

In many cases, also need one deck intermediate rubber layer between two-layer fiber-reinforced layer, making has bonding preferably between fiber and the rubber, and reduces the mutual wearing and tearing between the two fibre layers, increases the working life of flexible pipe thus.But increase the difficulty that one deck rubber layer obviously increases raw material and production cost and production technology again, it is more thick and heavy that resulting flexible pipe also becomes.

Flexible pipe for example power steering tube is not relate to problem, the saving cost of production of load transfer and simplifies production technology compared with the advantage with double-deck fiber-reinforced layer as if employing single layer fibre enhancement layer.But, only use high-intensity fiber, for example para-aramid or steel wire etc. form the single layer fibre enhancement layer of flexible pipe, though the flexible pipe that is obtained satisfies the requirement of anticracking pressure, yet can't satisfy the requirement of volumetric expansion.

Therefore prior art can't provide so far flexible pipe that the single layer fibre enhancement layer is only arranged as power steering tube, and reach industrial requirement simultaneously to its anticracking pressure and volumetric expansion.

The model utility content

The purpose of this utility model provides the flexible pipe that only uses the single layer fibre enhancement layer, and this flexible pipe can satisfy industrial to the anticracking pressure of power steering tube and the requirement of volumetric expansion simultaneously.

The utility model provides a kind of flexible pipe, it comprises at least one deck die layer, one deck outer covering layer and the single layer fibre enhancement layer between die layer and outer covering layer at least, described fiber-reinforced layer comprises by one para-aramid fiber at least and the compound rope that forms more than or equal to 15% high elongated fibers twisted of one elongation at break at least together, and the twist coefficient of described compound rope is 4.5-12; The die layer and the outer covering layer of described flexible pipe are formed by elastic substrate.

Since the utility model adopt by one para-aramid fiber at least and at least the compound rope that together forms of one high elongated fibers twisted constitute described fiber-reinforced layer, it is industrial to the anticracking pressure of power steering tube and the requirement of volumetric expansion to make that prepared flexible pipe only adopts the single layer fibre enhancement layer just can satisfy simultaneously.The anticracking pressure scope of the flexible pipe that is obtained is that the volumetric expansion scope is depressed in 8.97MPa and is 3-17cc/foot more than or equal to 41.4MPa.Flexible pipe of the present utility model can be used as power steering tube ideally.

Description of drawings

Fig. 1 is the three-dimensional cutaway view of a mode of execution of flexible pipe of the present utility model;

Fig. 2 is the three-dimensional cutaway view of a mode of execution of flexible pipe of the present utility model;

Fig. 3-Fig. 5 is the schematic representation of fiber-reinforced layer in the mode of execution of flexible pipe of the present utility model;

Fig. 6-Fig. 8 is the structural representation of compound rope in the fiber-reinforced layer in several mode of executions of flexible pipe of the present utility model.

Embodiment

Unless otherwise indicated, all publications that the utility model is mentioned, patent application, patent and other reference all are incorporated into herein by reference in full, are equivalent to be presented in full this paper.

Unless otherwise defined, all technology used herein and scientific terminology have the common same implication of understanding of the utility model one skilled in the art.Under the situation of conflicting, comprise that with this specification definition is as the criterion.

Unless otherwise indicated, all percentage, umber, ratio etc. are all by weight.

When explaining certain amount, concentration or other value or parameter with the form of scope, preferable range or preferred numerical upper limits and preferred numerical lower limits, be to be understood that to be equivalent to specifically to have disclosed any scope that combines by with any a pair of range limit or preferred value and any range lower limit or preferred value, and do not consider whether this scope specifically discloses.Unless otherwise noted, the listed number range of this paper is intended to comprise the end points of scope and all integers and the mark within this scope.

In this article, term " by ... form " or " by ... constitute " be equal to " comprising/comprise ".Term used herein " comprises ", " comprising ", " having ", " having " " are contained " or their any other variants, is that intention comprises comprising of non-exclusionism.For example, the composition, process, method, product or the equipment that comprise a series of key elements might not be only limited to those key elements, but can also comprise clearly do not list or these compositions, process, method, product or equipment intrinsic other key elements.And, unless clearly represent contrary, otherwise, " or " be meant and comprise " or " but not exclusive " or ".For example, below all satisfy condition A or B:A of any condition be false (or not existing) for true (or existence) and B, A is true (or existence) for false (or not existing) and B, and A and B be true (or existence).

Unless other explanation is arranged, material of the present utility model, method and embodiment only are illustrative, and not restrictive.Be similar to or be equal to those methods as herein described and material though can adopt in enforcement of the present utility model or test, this specification has hereinafter been described suitable method and material.

Flexible pipe of the present utility model comprises the fiber-reinforced layer of at least one layer of die layer, individual layer and one deck outer covering layer at least.Fig. 1-Fig. 2 has represented the three-dimensional cutaway view of the flexible pipe in the mode of execution of the present utility model, wherein the compound rope in 1 expression flexible pipe, 2 expression die layer, 3 expression fiber-reinforced layers, 4 expression outer covering layers, the 10 expression fiber-reinforced layers.

Flexible pipe of the present utility model has adopted the fiber-reinforced layer of individual layer, described fiber-reinforced layer comprises by one para-aramid fiber at least and the compound rope that forms more than or equal to 15% high elongated fibers twisted of one elongation at break at least together, and the twist coefficient of described compound rope is 4.5-12.

In this application, term " aramide-fibre " is meant the fiber that is made through spinning by amido link or the imide bond connection linear macromolecule that aromatic group constituted, wherein the amido link of at least 85 % or imide bond directly are connected with two aromatic rings, and when having imide bond, its number is no more than amido link.

In the utility model, employed para-aramid fiber in the compound rope is had no particular limits.The Linear density scope of preferred one para-aramid fiber is the 200-3500 dawn, more preferably the 600-2000 dawn; The ultimate strength scope is the 18-28 grams of force per Denier; And/or the elongation at break scope is 1.5-5.0%.Described compound rope preferably contains 1-10 thigh, more preferably 1-5 thigh para-aramid fiber.

Typical para-aramid fiber is such as but not limited to being produced by E.I.Du Pont Company

The series fiber.

In the utility model, described high elongated fibers is meant the elongation at break that has more than or equal to 15%, preferably has any suitable fiber of the elongation at break of 15-40%.The preferably at least a fiber that is selected from polyester, nylon and meta-aramid fiber of described high elongated fibers.The Linear density scope of preferred one high elongated fibers is the 200-3500 dawn, more preferably the 500-2000 dawn; The ultimate strength scope is the 3-10 grams of force per Denier; And/or the elongation at break scope is 15-40%, more preferably 18-35%.Described compound rope preferably contains 1-10 thigh, the more preferably high elongated fibers of 1-5 thigh.

Typical high elongation polyester fibre is such as but not limited to the polyester fibre of being produced by Performance Fibers company.Typical high elongation nylon fiber comprises nylon 6 and nylon 66 fiber, can be available from following manufacturer, such as but not limited to refreshing horse company and Kordsa company.Typical high elongation meta-aramid fiber is such as but not limited to being produced by E.I.Du Pont Company With produce by Supreme Being people company

In this application, term " dawn " or " DENIER " (denier) are meant gram number 9000 meters untwisted weight that fiber has.Usually the dawn number is big more, and its fiber is thick more.By the fibrous strand of multiply, its dawn number is the summation of contained multiply fiber.For example, twisted after fiber by 3 strand of 1500 dawn combines and strand, promptly calculating is the strand at one 4500 dawn.But, in fact by twisting, the weight in the unit length of this strand can be slightly higher than 4500 dawn.

Term " twisted together " is meant the para-aramid fiber of at least one stock-traders' know-how first twist that constitutes compound rope and at least one stock-traders' know-how first twist or the not high elongated fibers retwist of first twist and the structure that forms.Term " first twist " is meant each strand fiber twisting process separately that constitutes compound rope; Term " retwist " is meant that all fibres that constitutes compound rope combines the twisting process that forms compound rope afterwards.For avoiding mixing line in the Eight Diagrams, though when constitute compound rope at least one high elongated fibers or strand without first twist (promptly non-twist), after the para-aramid fiber of itself and at least one stock-traders' know-how first twist combined, the twisting process that forms compound rope still was called " retwist ".

In the first twist stage, when using more than two strands the para-aramid fiber, twisting after each strand para-aramid fiber can be twisted respectively or combine; When using more than two strands high elongated fibers, twisting after the high elongated fibers of each burst can all not twisted, twisted respectively or combine.

A kind of mode that the mode of described retwist comprises is to make para-aramid fiber and at least one stock-traders' know-how first twist of at least one stock-traders' know-how first twist that constitutes compound rope or twisted after the high elongated fibers of first twist does not combine, Linear density, number of share of stock, the twist of looking described para-aramid fiber and high elongated fibers are poor, can form structure example as Fig. 6-compound rope shown in Figure 8.In Fig. 6-Fig. 8, the compound rope of 10 expressions, 100 expression para-aramid fibers, the high elongated fibers of 200 expressions.

The twist of the first twist of para-aramid fiber and high elongated fibers can be identical or different in the described compound rope, and the direction of first twist can be identical or different; The direction of the retwist of compound rope is opposite with the first twist direction of para-aramid fiber usually.Term " twist " is meant that (twist per meter, TPM), its unit is a sth. made by twisting/rice to the twisting count that fiber or strand had in one meter length.

In compound rope described in the utility model, (twist multiplier TM) is 4.5-12 to the twist coefficient of the first twist of para-aramid fiber, preferred 5-8.5; The twist coefficient of the first twist of high elongated fibers is 0-12; The twist coefficient of compound rope is 4.5-12, preferred 5-8.5.

For the twist coefficient of the identical fiber of proportion, the first twist of para-aramid fiber for example of the present utility model or high elongated fibers, its calculation method is as follows:

$\mathrm{TM}=\mathrm{TPM}\×\frac{\sqrt{\frac{D}{\mathrm{\ρ}}}}{2395}$

Wherein

TM: twist coefficient (no unit)

TPM: the twist (sth. made by twisting/rice)

D: the Linear density of fiber (dawn)

ρ: the proportion (g/cm of fiber ³).

For one para-aramid fiber at least and one high elongated fibers is formed at least compound rope, the calculation method of its twist coefficient is as follows for of the present utility model:

$\mathrm{TM}=\mathrm{TPM}\&times;\frac{\sqrt{\frac{D_1}{{\mathrm{\&rho;}}_1}+\frac{{\mathrm{<figure-callout\; id="2"\; label="D"\; filenames="HSA00000391677600011.png,HSA00000391677600012.png"\; state="\{\{state\}\}">D</figure-callout>}}_2}{{\mathrm{\&rho;}}_2}}}{2395}$

Wherein

TM: twist coefficient (no unit)

TPM: the twist (sth. made by twisting/rice)

D ₁: the described summation of the Linear density of one para-aramid fiber at least (dawn)

ρ ₁: the proportion (g/cm of para-aramid fiber ³)

D ₂: the summation of the Linear density of described one high elongated fibers at least (dawn)

ρ ₂: the proportion (g/cm of high elongated fibers ³).

In compound rope described in the utility model, preferred para-aramid fiber accounts for the 30-80% of compound rope gross weight, and high elongated fibers accounts for the 20-70% of compound rope gross weight.

Of the present utility model one preferred embodiment in, described compound rope by one para-aramid fiber at least and at least one polyester fibre twisted form, wherein the para-aramid fiber accounts for the 50-80% of compound rope gross weight, and polyester fibre accounts for the 20-50% of compound rope gross weight.

Of the present utility model another preferred embodiment in, described compound rope by one para-aramid fiber at least and at least one meta-aramid fiber twisted form, wherein the para-aramid fiber accounts for the 30-70% of compound rope gross weight, and meta-aramid fiber accounts for the 30-70% of compound rope gross weight.

Of the present utility model another preferred embodiment in, described compound rope by one para-aramid fiber at least and at least one nylon fiber twisted form, wherein the para-aramid fiber accounts for the 35-75% of compound rope gross weight, and nylon fiber accounts for the 25-65% of compound rope gross weight.Wherein nylon fiber preferably includes nylon 6 and nylon 66 fiber.

The compound rope that is used for flexible pipe of the present utility model can be randomly in its part surface coating or dip bonding agent at least before forming described fiber-reinforced layer.In addition, also can be after forming described fiber-reinforced layer randomly at its part surface application of adhesive at least.The utility model has no particular limits described tackiness agent, can be any suitable bonding well known in the art, for example resorcinol-formaldehyde-latex (RFL) tackiness agent.The compound rope of flexible pipe of the present utility model can make described compound rope by baking oven or the air drying of temperature between 100-250 ℃ through after the adhesive treatment, comes drying and solidifies its lip-deep tackiness agent.

The compound rope that is used for flexible pipe of the present utility model also can be randomly through heat treatment before forming described fiber-reinforced layer for avoiding untwisting.Heat treated temperature is preferably 100-250 ℃, and heat treatment period is preferably 1-120 minute, more preferably 1-10 minute.

In the utility model, described fiber-reinforced layer can form by using described compound rope by any method well known in the art.Described fiber-reinforced layer preferably uses described compound rope to twine (spiral wrapping) technology by knitting (knitting), braiding (braiding) and/or spiral and forms, and more preferably twines by braiding or spiral to form.

There is no particular limitation to the thickness of described fiber-reinforced layer, and those of ordinary skill in the art can select according to requirement of actual application.For example, can weave described fiber-reinforced layer with the knitting machine of 16-48 ingot, the angle of weave of compound rope (α) is preferably 40 degree-65 degree; More preferably 50 degree-60 are spent.Here " angle of weave " is meant the angle between axial (length direction) of the tangent direction of compound rope and flexible pipe.Fig. 3 has shown the braiding structure of fiber-reinforced layer in the mode of execution of flexible pipe of the present utility model, is Weaving pattern one on the other; Wherein 3 expression fiber-reinforced layers, the compound rope of 10 expressions, 12 are represented axial (length direction) of flexible pipes, and angle α represents the angle of weave of compound rope.Fig. 4 has shown the braiding structure of fiber-reinforced layer in another mode of execution of flexible pipe of the present utility model, is the Weaving pattern under two on two; Wherein 3 expression fiber-reinforced layers, the compound rope of 10 expressions, 12 are represented axial (length direction) of flexible pipes, and angle α represents the angle of weave of compound rope.Fig. 5 has shown the braiding structure of fiber-reinforced layer in another mode of execution of flexible pipe of the present utility model, for the compound rope of four parallel winds on each spindle, with the formed Weaving pattern of weave under two on two; Wherein 3 expression fiber-reinforced layers, the compound rope of 10 expressions, 12 are represented axial (length direction) of flexible pipes, and angle α represents the angle of weave of compound rope.

The die layer that is used for flexible pipe of the present utility model and the elastic substrate of outer covering layer are had no particular limits, can be any rubber or thermosetting resin, but not be thermoplastic resin.The elastic substrate of described die layer and outer covering layer preferably is selected from natural rubber (NR) independently of one another, polyurethane/urea elastomer (PU), neoprene (CR), nitrile butadiene rubber (NBR), hydrogenated nitrile-butadiene rubber (HNBR), haloflex (CPE), ethylene propylene diene rubber (EPDM), the AEM polymer is (by ethene, the dimer that methyl acrylate is made, or by ethene, methyl acrylate and acidity contain the terpolymer that the epoxy group monomer is made), chlorosulfonated polyethylene base polymer (CSM), acrylic polymer, silicone rubber and fluorinated elastomer, or above-mentioned any two or more composition.

There is no particular limitation to the thickness of described polymer pipe sandwich layer and polymer outer covering layer, and those of ordinary skill in the art can select according to requirement of actual application.

Preparation method to flexible pipe of the present utility model has no particular limits, can adopt the technology and the step of the known preparation flexible pipe of those of ordinary skill in the art, as long as satisfy the fiber-reinforced layer that only uses individual layer to form in the flexible pipe by compound rope described in the utility model.For example, flexible pipe of the present utility model can followingly form: form one deck elastic substrate die layer at least by expressing technique, then on die layer, adopt compound rope described in the utility model to form the single layer fibre enhancement layer, and then on described fiber-reinforced layer, form one deck elastic substrate outer covering layer at least by expressing technique.

Flexible pipe of the present utility model can be used for hose, and described hose comprises flexible pipe of the present utility model, is enclosed within the hose connector and the clip at its two ends.

Of the present utility model one preferred embodiment in, the anticracking pressure scope of described flexible pipe is more than or equal to 41.4MPa, the volumetric expansion scope is depressed in 8.97MPa and is 3-17cc/foot.Of the present utility model another preferred embodiment in, described flexible pipe is as power steering tube.

Embodiment

Below by embodiment the utility model is carried out specific description, but scope of the present utility model is not subjected to these embodiments' restriction.

Employed material:

600 dawn

The 1K1668 fiber is from E.I.Du Pont Company;

1000 dawn

The 2F0037 fiber is from E.I.Du Pont Company;

1000 dawn

The 1K211 fiber is from E.I.Du Pont Company;

1500 dawn

The 2F0036 fiber is from E.I.Du Pont Company;

1500 dawn

The 1F249 fiber is from E.I.Du Pont Company;

3000 dawn The 1F1380 fiber is from E.I.Du Pont Company;

1200 dawn The T430 fiber type is from E.I.Du Pont Company;

The nylon 66 fiber T-728 type at 840 dawn is from Invista;

The nylon 66 fiber T-728 type at 1260 dawn is from Invista;

The polyester fibre at 500 dawn (PET) is from Chinese Wuxi Tai Ji Industry Co.,Ltd.

Preparation process:

The various fibers of following each embodiment of the present utility model and each Comparative Examples and compound rope all use a ring ingot twisting mill, do twisting by the specified twist and handle.

The preparation of compound rope: at first will on a ring ingot twisting mill

The high elongated fibers of fiber (being the para-aramid fiber) and appointment by specified twist twisting, merges two kinds of fibers respectively then, and twists to the opposite direction of first twist direction, forms compound rope.

The manufacturing of flexible pipe: the power steering tube for preparing I type and II type according to SAE J188 standard measure.The internal diameter of I type is the 0.972-1.03 centimetre, and external diameter is the 1.91-2.07 centimetre; The internal diameter of II type is the 0.912-1.01 centimetre, and external diameter is the 1.91-2.07 centimetre.At first weigh each raw material components that comprises elastic substrate, become elastomeric compound by mixer mixing then by suitable weight proportion; Extruding pipe sandwich layer from extruder; Then described compound rope is passed through knitting machine with 24 ingots, be woven on the die layer, with weave one on the other, form the single layer fibre enhancement layer of similar Fig. 3, the angle of weave of all compound ropes is 54.7 °; Then will be expressed into and form the pipe embryo on the described layers of braided fibers as the elastomeric compound of outer covering layer; Apply sufficient temperature and pressure at last, will manage that embryo is cured or vulcanizing treatment.

Embodiment 1

With one 600 dawn

The polyester fibre at 1K1668 fiber and one 500 dawn is twisted to the twist of 693 sth. made by twisting/rice respectively with same direction, then they are combined, and be twisted to the twist of 693 sth. made by twisting/rice to opposite direction, and forming compound rope (as Fig. 6), the twist coefficient of described compound rope is about 8.Then with the parallel Split Down of compound rope of two twisting, again with the compound rope parallel wind after four described Split Down to each spindle, be woven in the flexible pipe.Its single layer fibre enhancement layer has the interlacing pattern one on the other of eight parallel compound ropes.

Embodiment 2

The Kevlar 1K1668 fiber at two strand of 600 dawn is twisted to the twist of 697 sth. made by twisting/rice respectively with same direction, and the polyester fibre at one 500 dawn also is twisted to the twist of 697 sth. made by twisting/rice with same direction, then these three strands of fibers are combined, and be twisted to the twist of 697 sth. made by twisting/rice to opposite direction, form compound rope (as Fig. 7), the twist coefficient of described compound rope is about 10.With the compound rope Split Down of two twisting, again with the compound rope parallel wind of three described parallel Split Down to each spindle, be woven in the flexible pipe.Its single layer fibre enhancement layer has the interlacing pattern one on the other of the parallel compound rope of the six roots of sensation.

Embodiment 3

With one 1000 dawn

The 2F0037 fiber is twisted to the twist of 400 sth. made by twisting/rice, will twist then

Fiber is round one 1200 untwisted dawn Fiber is twisted to the twist of 400 sth. made by twisting/rice round about, forms compound rope (as Fig. 8), and the twist coefficient of described compound rope is about 6.6.Then with the parallel Split Down of compound rope of two twisting, again with the compound rope parallel wind after three described Split Down to each spindle, be woven in the flexible pipe.Its single layer fibre enhancement layer has the interlacing pattern one on the other of the parallel compound rope of the six roots of sensation.

Embodiment 4

With two strand of 1500 dawn

The 2F0036 fiber is twisted to the twist of 274 sth. made by twisting/rice respectively with same direction, and the nylon 66 fiber at one 1260 dawn also is twisted to 137 sth. made by twisting/rice with same direction.Then these three strands of fibers are merged, the twist that is twisted to 274 sth. made by twisting/rice round about forms compound rope (as Fig. 7), and the twist coefficient of described compound rope is about 5.3.Then with three described compound rope parallel winds to each spindle, be woven in the flexible pipe.Its single layer fibre enhancement layer has the interlacing pattern one on the other of three parallel compound ropes.

Embodiment 5

With one 1000 dawn

The 1K211 fiber is twisted to the twist of 415 sth. made by twisting/rice, and the T-728 nylon 66 fiber at one 840 dawn is twisted to the twist of 300 sth. made by twisting/rice with equidirectional.Then these two strands of fibers are merged, be twisted to the twist of 415 sth. made by twisting/rice round about, form compound rope (as Fig. 6), the twist coefficient of described compound rope is about 6.5.Then together with the parallel Split Down of three described compound ropes, again with the compound rope parallel wind of four Split Down to each spindle, be woven in the flexible pipe.Its single layer fibre enhancement layer has the interlacing pattern one on the other of 12 parallel compound ropes.

Embodiment 6

Use the compound rope in resorcinol formaldehyde latex (RFL) the adhesive formulation Processing Example 5.With described compound rope dipping by RFL liquid, then 160 ℃ of dryings 1 minute, again 240 ℃ of dryings 1 minute.Then together with three treated so parallel Split Down of compound rope.Again with the compound rope parallel wind after four described Split Down to each spindle, be woven in the flexible pipe.Its single layer fibre enhancement layer has the interlacing pattern one on the other of 12 parallel compound ropes.

Embodiment 7

With one 3000 dawn The 1F1380 fiber is twisted to the twist of 286 sth. made by twisting/rice, and the T-728 nylon 66 fiber at one 1260 dawn is twisted to the twist of 372 sth. made by twisting/rice with identical direction.Then these two strands of fibers are merged, be twisted to the twist of 286 sth. made by twisting/rice round about, form compound rope (as Fig. 6), the twist coefficient of described compound rope is about 6.7.With two parallel recoils on each spindle of described compound rope, be woven in the flexible pipe.Its single layer fibre enhancement layer has the interlacing pattern one on the other of two parallel compound ropes.

Embodiment 8

With one 1500 dawn

The 1F249 fiber is twisted to the twist of 286 sth. made by twisting/rice, and the T-728 nylon 66 fiber at one 1260 dawn is twisted to the twist of 286 sth. made by twisting/rice with identical direction.Then with two strands as above twisting

Fiber and one nylon 66 fiber of as above twisting merge, and are twisted to the twist of 286 sth. made by twisting/rice round about, form compound rope (as Fig. 7), and the twist coefficient of described compound rope is about 6.7.Two described compound rope parallel winds to each spindle, are woven in the flexible pipe.Its single layer fibre enhancement layer has the interlacing pattern one on the other of two parallel compound ropes.

Embodiment 9

At 250 ℃ the compound rope heat treatment among the embodiment 1 was cooled off in 2 minutes then.Then with two through the parallel Split Down of heat treated compound rope, again with the compound rope parallel wind after four described Split Down to each spindle, be used for being woven into flexible pipe.Its single layer fibre enhancement layer has the interlacing pattern one on the other of eight parallel compound ropes.

Embodiment 10

At 250 ℃ the compound rope heat treatment among the embodiment 4 was cooled off in 2 minutes then.Then with three through heat treated compound rope parallel wind to each spindle, be woven in the flexible pipe.Its single layer fibre enhancement layer has the interlacing pattern one on the other of three parallel compound ropes.

Comparative Examples 1

With one 1500 dawn

The 1F249 fiber is twisted to the twist of 80 sth. made by twisting/rice.Then three strands of fiber Split Down (being strand) parallel winds of so twisting are woven in the flexible pipe to each spindle.Its single layer fibre enhancement layer has the interlacing pattern one on the other of three parallel compound ropes.

Comparative Examples 2

With one 1000 dawn untwisted

1K211 fiber and one 1200 dawn are untwisted

The T430 fiber merges, and is twisted to the twist of 67 sth. made by twisting/rice, forms compound rope, and the twist coefficient of described compound rope is about 1.1.Then with four so the compound rope parallel winds of twisting to each spindle, be woven in the flexible pipe.Its single layer fibre enhancement layer has the interlacing pattern one on the other of four parallel compound ropes.

Comparative Examples 3

With one 3000 dawn

The 1F1380 fiber is twisted to the twist of 60 sth. made by twisting/rice.Fiber (being strand) parallel wind with two bursts of described twisting is woven in the flexible pipe to each spindle then.Its single layer fibre enhancement layer has the interlacing pattern one on the other of two parallel compound ropes.

Testing property

Adopt ASTM D7269-08 standard that the compound rope or the strand that are obtained by the foregoing description and Comparative Examples are tested its ultimate strength and elongation at break.

The standard that the anticracking pressure of flexible pipe can adopt ASTM D380 the 16.1st joint is to being tested by the anticracking pressure performance of the flexible pipe of the foregoing description and Comparative Examples preparation; Also can get (referring to " the The Application ofTextiles in Rubber " that D.B.Wootton showed, chapter 9 appendix, the 196th page) by following formula calculating.Usually by formula calculate anticracking pressure will consider the braid efficiency of its cotton rope, it is multiplied by the conversion coefficient of 0.75-0.8 again.

P＝0.2N _SRsinθ/DL

Wherein: P=anticracking pressure (unit: crust)

θ=angle of weave

N _STotal radical of=parallel compound rope

The ultimate strength of the compound rope of R=(unit: newton)

The average diameter of D=fiber-reinforced layer (unit: centimetre)

The L=pitch length (unit: centimetre)

The volumetric expansion of flexible pipe can adopt the standard of SAE J188 the 9.7th joint that prepared flexible pipe is tested; Also can calculate and get according to the elongation at break of used compound rope.

The ultimate strength and the elongation at break of the compound rope that the foregoing description and Comparative Examples are adopted, and the numerical result of the anticracking pressure of prepared flexible pipe and volumetric expansion sees table 1 for details.

By The above results as can be seen, the utility model by adopt by one para-aramid fiber at least and at least the compound rope that constitutes of one high elongated fibers form fiber-reinforced layer, make prepared flexible pipe only use the fiber-reinforced layer of individual layer just to reach desirable anticracking pressure and volumetric expansion, satisfy industrial performance requirement power steering tube I type or II type.

Claims (16)

1. flexible pipe, it is characterized in that, comprise at least one deck die layer, one deck outer covering layer and the single layer fibre enhancement layer between die layer and outer covering layer at least, described fiber-reinforced layer comprises by one para-aramid fiber at least and the compound rope that forms more than or equal to 15% high elongated fibers twisted of one elongation at break at least together, and the twist coefficient of described compound rope is 4.5-12; The die layer and the outer covering layer of described flexible pipe are formed by elastic substrate.

2. flexible pipe as claimed in claim 1 is characterized in that, per share described para-aramid fiber satisfies following at least a condition in the described compound rope:

Linear density is the 200-3500 dawn,

Ultimate strength be the 18-28 grams of force per Denier and

Elongation at break is 1.5-5.0%.

3. flexible pipe as claimed in claim 1 is characterized in that, per share described high elongated fibers satisfies following at least a condition in the described compound rope:

Linear density is the 200-3500 dawn,

Ultimate strength be the 3-10 grams of force per Denier and

Elongation at break is 15-40%.

4. as claim 1 or 3 described flexible pipes, it is characterized in that described high elongated fibers is selected from the fiber of polyester, nylon and meta-aramid fiber for one or more.

5. flexible pipe as claimed in claim 1 is characterized in that, the twist coefficient of described compound rope is 5-8.5.

6. flexible pipe as claimed in claim 1 is characterized in that, described in the described compound rope at least one para-aramid fiber account for the 30-80% of compound rope gross weight, described one high elongated fibers at least accounts for the 20-70% of compound rope gross weight.

7. as claim 1 or 6 described flexible pipes, it is characterized in that, described compound rope by one para-aramid fiber at least and at least one polyester fibre twisted form, wherein said one para-aramid fiber at least accounts for the 50-80% of compound rope gross weight, and described one polyester fibre at least accounts for the 20-50% of compound rope gross weight.

8. as claim 1 or 6 described flexible pipes, it is characterized in that, described compound rope by one para-aramid fiber at least and at least one meta-aramid fiber twisted form, wherein said one para-aramid fiber at least accounts for the 30-70% of compound rope gross weight, and described one meta-aramid fiber at least accounts for the 30-70% of compound rope gross weight.

9. as claim 1 or 6 described flexible pipes, it is characterized in that, described compound rope by one para-aramid fiber at least and at least one nylon fiber twisted form, wherein said one para-aramid fiber at least accounts for the 35-75% of compound rope gross weight, and described one nylon fiber at least accounts for the 25-65% of compound rope gross weight.

10. flexible pipe as claimed in claim 1 is characterized in that, described compound rope randomly its at least part surface be coated with tackiness agent.

11. flexible pipe as claimed in claim 1 is characterized in that, described fiber-reinforced layer by described compound rope by knitting, the braiding and/or the spiral winding process form.

12. flexible pipe as claimed in claim 1, it is characterized in that the elastic substrate that is used for described die layer and outer covering layer is selected from natural rubber, polyurethane/urea elastomer, neoprene, nitrile butadiene rubber, hydrogenated nitrile-butadiene rubber, haloflex, ethylene propylene diene rubber, AEM polymer, chlorosulfonated polyethylene base polymer, acrylic polymer, silicone rubber and fluorinated elastomer independently of one another.

13. flexible pipe as claimed in claim 1 is characterized in that, its anticracking pressure scope is more than or equal to 41.4MPa, and the volumetric expansion scope is depressed in 8.97MPa and is 3-17cc/foot.

14., it is characterized in that it is a power steering tube as claim 1 or 13 described flexible pipes.

15. a hose is characterized in that, comprises as claim 1 or 13 described flexible pipes, the hose connector that is enclosed within its two ends and clip.

16. hose as claimed in claim 15 is characterized in that, it is the power steering tube assembly.

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