CN105351640A - Preparation method of turbo-charging rubber pipe - Google Patents
Preparation method of turbo-charging rubber pipe Download PDFInfo
- Publication number
- CN105351640A CN105351640A CN201510956379.8A CN201510956379A CN105351640A CN 105351640 A CN105351640 A CN 105351640A CN 201510956379 A CN201510956379 A CN 201510956379A CN 105351640 A CN105351640 A CN 105351640A
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- rubber
- preparation
- glue
- elastomeric compound
- layer
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L11/10—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements not embedded in the wall
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
Abstract
The invention relates to the technical field of vehicle preparation, in particular to a preparation method of a turbo-charging rubber pipe. The preparation method comprises the following steps: a lining mixed rubber and an anti-seepage mixed rubber are bonded to form a compound rubber layer; a reinforced cloth pasting rubber or frictioning rubber is prepared to a rubber-coated cloth reinforced layer; the compound rubber layer is wound to form a pipe shape, the joint is leveled, and bubbles are removed; and the rubber-coated cloth reinforced layer is wrapped outside the compound rubber layer, the joint is leveled, and bubbles are removed. The turbo-charging rubber pipe, prepared by the method, improves the adhesive force between a lining layer and an anti-seepage layer, improves the softness and the assembly performance of the rubber pipe, reduces the risk of low-temperature cracking and oil seepage, and further protects the performance of the rubber-coated cloth reinforced layer.
Description
Technical field
The present invention relates to technical field prepared by automobile, in particular to a kind of preparation method of turbine pressurized hose.
Background technique
Along with the enhancing of people's environmental protection consciousness, more and more tighter to the restriction of motor vehicle exhaust emission.For meeting the requirement of constantly strict Abgasgesetz, vehicle turbine supercharging technology is progressively adopted.Turbocharging technology utilizes exhaust gas driven supercharging blade high speed rotating, and pressurized air enters cylinder, makes fuel oil Thorough combustion.Friction generates heat in pressurization and between parts for gas, whole system is caused to be in very high temperature, simultaneously owing to often entering in pressurization system with oil gas of some atomizations in the waste gas of motor discharge, the requirement of the application such as this proposes oil resistant to turbine pressurized hose, high temperature resistant, sealing hydrocarbons is good.In prior art, turbocharger tube often adopts the outer silicon of the interior fluorine of resistance to high temperature excellence or the outer silicon structure of interior fluorine silicon, the defect that the outer silicone tube of interior fluorine exists: (1) fluorine glue elastomeric compound Mooney is high, in forming process, bag pastes mould difficulty, and bubble deposited by easy nest, causes layer defects in sebific duct; (2) fluorine glue density is large, and the sebific duct of formation is hard, heavy, entrucking difficulty; (3) fluorine glue resistance to low temperature is poor, and when extremely cold, hose lining cracking, exists oil impregnate risk; (4) fluorine glue is different with polarity from silica gel structure of molecule, bad adhesion; Also have blended to fluorine glue and silica gel at present that this not only wastes energy consumption as transition layer to improve adhesive property, and both structure of molecule and different polarities are very greatly, very difficult evenly blended, cause transition layer poor performance.The defect that the outer silicone tube of interior fluorine silicon exists: (1) fluorine silica gel and silica gel intensity and tear strength low, cause sebific duct bursting pressure to reduce; (2) fluorine silica gel and silica gel are all with the Si-O of softness for backbone structure, and molecular motion ability is strong, and Small molecular oil gas easily spreads at sebific duct parietal layer, and sealing hydrocarbons is poor, cause hydraulic performance decline after layer of silica gel oil resistant simultaneously.
In view of this, special proposition the present invention.
Summary of the invention
The first object of the present invention is the preparation method providing a kind of turbine pressurized hose; the preparation method of described turbine pressurized hose improves the adhesion between the inside liner of turbine pressurized hose and impermeable layer; while guarantee sebific duct intensity and bursting pressure; improve ductility and the assembly performance of sebific duct; also reduce risk and the oil impregnate risk of cold cracking, protect the performance covering glue enhancement layer further.
In order to realize above-mentioned purpose of the present invention, spy by the following technical solutions:
A preparation method for turbine pressurized hose, step is as follows:
(1) liner elastomeric compound and antiseepage elastomeric compound are fit together, make multiple glue-line;
(2) cloth rubberizing or rubber will be strengthened, and make and cover adhesive plaster enhancement layer;
(3) multiple glue-line is rolled into tubulose, seam crossing is rolled smooth and drives bubble away;
(4) will cover adhesive plaster enhanced layer packets is attached to outside multiple glue-line, rolls smooth and drive bubble away by seam crossing.
Further, the glue-line that described reinforcement cloth produces after rubberizing or rubber is positioned at the side of described reinforcement cloth away from described multiple glue-line.
Further, described reinforcement cloth is that cloth strengthened by aramid fiber or polyester.
Further, described glue-line is silica gel elastomeric compound.
Further, covering glue enhancement layer described in is 1-8 layer.
Further, after step (4) completes, be wound around one deck nylon water cloth or cellophane outward at the described glue enhancement layer that covers.
Further, described liner elastomeric compound is fluorine glue elastomeric compound.
Further, described antiseepage elastomeric compound is fluorine silica gel elastomeric compound.
Further, after step (4) completes, vulcanizing treatment need be carried out to sebific duct.
Further, described sulfurize temperature is 160-180 degree Celsius, and cure time is 20-90 minute.
Compared with prior art, the invention provides a kind of method preparing turbine pressurized hose, the sebific duct of preparation is owing to having inside liner, impermeable layer and covering glue enhancement layer, beneficial effect is: because multiple glue-line is fit together by liner elastomeric compound and antiseepage elastomeric compound, improve the adhesion between inside liner and impermeable layer; Improve ductility and the assembly performance of sebific duct; Reduce the risk of cold cracking and oil impregnate, protect the performance covering adhesive plaster enhancement layer further.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below.
Fig. 1 is the structural representation of turbine pressurized hose prepared by method provided by the invention.
1, inside liner 2, impermeable layer 3, cover adhesive plaster enhancement layer
Embodiment
Below in conjunction with embodiment, embodiment of the present invention are described in detail, but it will be understood to those of skill in the art that the following example only for illustration of the present invention, and should not be considered as limiting the scope of the invention.Unreceipted actual conditions person in embodiment, the condition of conveniently conditioned disjunction MANUFACTURER suggestion is carried out.Agents useful for same or the unreceipted production firm person of instrument, be and can buy by commercially available the conventional products obtained.
Embodiment 1
The present embodiment provides a kind of preparation method of turbine pressurized hose, and step is as follows:
(1) liner elastomeric compound and antiseepage elastomeric compound are fit together, make multiple glue-line;
(2) cloth rubberizing or rubber will be strengthened, and make and cover adhesive plaster enhancement layer;
(3) multiple glue-line is rolled into tubulose, seam crossing is rolled smooth and drives bubble away;
(4) will cover adhesive plaster enhanced layer packets is attached to outside multiple glue-line, rolls smooth and drive bubble away by seam crossing.
Namely the turbocharger tube that prepared by described method is followed successively by inside liner 1, impermeable layer 2 from inside to outside and covers adhesive plaster enhancement layer 3.
So-called elastomeric compound refers to the non cross-linked state be mixed in by compounding ingredient in bulk, granular and Powdered rubber, and has the sizing material of mobility.
Elastomeric compound manufactures the blank of rubber product, i.e. semi-finished product, therefore the colloidal state dust dispersion quality of elastomeric compound is directly connected to the quality of finished product, and the viscoelasticity of elastomeric compound, rheological characteristic then directly affect the processing technologys such as calendering, extrusion simultaneously.
In the present embodiment, described liner elastomeric compound and antiseepage elastomeric compound to be fit together, the mode of described laminating has a lot, such as calendering or extrusion etc., in the present embodiment, adopt the mode of calendering, namely with mangler by interior elastomeric compound together with antiseepage elastomeric compound calender lamination, make multiple glue-line, the thickness that described multiple glue-line is made according to actual needs, as preferably, the thickness of described multiple glue-line is 0.2-2 millimeter.
Rubberizing is overlayed on cord or canvas by sizing material with mangler, makes rubberized cord or kiss-coating canvas, for the production of tire or adhesive tape, spread goods.
The cloth of rubberizing is generally first after rubber, gluing or impregnation, paste upper glue layer again.Adopting four-roll calender, is the highly efficient process manufacturing tire by impregnation cord double spreading.In rubberizing sizing material, filler and plasticizing agent number should be some more, and the degree of plasticization of gum stock should be higher, and be consistent.During rubberizing, mangler two roller is constant velocity rotation, and during rubber the linear velocity of two rollers is not etc.
Rubber is the shearing force and the pressure that utilize rolling mill roller differential surface speed, and make sizing material clamp-on in fabric gap, this technique is called rubber.
Compared with rubberizing, rubber can be filled in the space of fabric sizing material, and fabric and sizing material can be made to have higher structural strength and flexible resistance.The cord of Tire production industry and canvas, through rubber and rubberizing, must be combined firmly rubberized cord to make rubber with cord.The roller linear velocity ratio of rubber tri-roll press machine is top roll 1: central roll 1.3 ~ 1.5: lower roll 1, upper and lower roll constant speed, and the fast and roller temperature of central roll rotating speed is higher than up-down rollers.Available two tri-roll press machines complete a two sides rubber operation.
In the present embodiment, cloth rubberizing or rubber on mangler will be strengthened, make and cover adhesive plaster enhancement layer, described in cover adhesive plaster enhancement layer thickness be 0.5-2 millimeter.
In the present embodiment, in order to the turbine pressurized hose that standardization is made, according to the structure of product and size by multiple glue-line with cover adhesive plaster enhancement layer and be cut into corresponding size.
In the present embodiment, be fixed on by mould on forming bench, multiple glue-line bag liner and antiseepage elastomeric compound are pressed into is attached on mould, rolls smooth and drive bubble away by stainless steel round bar by seam crossing; To cover glue enhanced layer packets is attached on multiple glue-line, rolls smooth and drive bubble away by stainless steel round bar by seam crossing.
In the present embodiment, the described adhesive plaster enhancement layer that covers comprises reinforcement cloth and glue-line, described reinforcement cloth produces glue-line after rubberizing or rubber, described glue-line is positioned at the side of described reinforcement cloth away from described multiple glue-line, covers adhesive plaster enhancement layer and be attached on multiple glue-line with cloth at inner glue mode bag outside namely, and the advantage of the sebific duct that this mode is shaping is sebific duct surface is glue-line, without the need to pasting one deck silica gel piece more separately, reduce operation, reduce manufacture cost, ensure that the wall thickness of product and the stable of size simultaneously.
In the present embodiment, described reinforcement cloth can be that cloth strengthened by aramid fiber or polyester.
Aramid fiber, also known as aramid fiber, English is Aramidfiber, is a kind of novel high-tech synthetic fiber, there is superhigh strength, high-modulus and high temperature resistant, acid-fast alkali-proof, the premium properties such as lightweight, its intensity is 5 ~ 6 times of steel wire, and modulus is 2 ~ 3 times of steel wire or glass fibre, and toughness is 2 times of steel wire, and weight is only about 1/5 of steel wire, at the temperature of 560 degrees Celsius, do not decompose, do not melt.It has good insulating properties and aging quality resistance, has very long life cycle.
Polyester, the polymer general name obtained by polyatomic alcohol polybasic alcohol and polybasic acid polycondensation.Main finger polyethylene terephthalate (PET), also comprises linear thermoplastic's resins such as polybutylene terephthalate (PBT) and polyarylate traditionally.A class excellent performance, broad-spectrum engineering plastics.Also can be made into polyester fibre and polyester film.Polyester comprises polyester resin and polyester elastomer.Polyester resin comprises again polyethylene terephthalate (PET), polybutylene terephthalate (PBT)) and polyarylate (PAR) etc.Polyester elastomer (TPEE) is generally polymerized by dimethyl terephthalate (DMT), BDO and poly-butanols, and segment comprises hard section part and soft section of part, is thermoplastic elastomer (TPE).
Adopt aramid fiber or polyester fibre preparation to strengthen cloth in the present embodiment, possess the features such as good mechanical performance.
In the present embodiment, described glue-line is silica gel elastomeric compound.
In the present embodiment, described in cover the difference of glue enhancement layer according to the mechanical property requirements for sebific duct, the number of plies can be 1-8 layer.
In the present embodiment, after step (4) completes, be wound around one deck nylon water cloth or cellophane outward at the described glue enhancement layer that covers.
In the present embodiment, described internal layer elastomeric compound is fluorine glue elastomeric compound, namely by fluorocarbon rubber and various compounding ingredient is mixing forms.Fluorine rubber has good physical and mechanical properties and chemical stability, excellent high temperature resistant, oil resistant, medium-resistance.
In the present embodiment, described impervious barrier elastomeric compound is fluorine silica gel elastomeric compound, is namely polymerized by trifluoro propyl methylsiloxane the fluorosioloxane rubber that obtains and various compounding ingredient is mixing forms.Fluorosioloxane rubber main chain is made up of Si-O key, maintains the heat resistance of organosilicon material, winter hardiness, on the basis of the excellent properties such as weather-resistant, due to the introducing of fluoro-containing group, has again chemical stability and the performance such as oil resistant, media-resistant of organic fluorine material excellence.
In the present embodiment, after step (4) completes, need carry out vulcanizing treatment to sebific duct, described sulfurize temperature is 160-180 degree Celsius, and cure time is 20-90 minute.
After sulfuration, water cloth or cellophane are got off from product surface solution, taken off by sebific duct from mould, cleaning, excision stub bar, gets product.
Vulcanization adopts the mode of hot air drying tunnel sulfuration to carry out, and this mode, compared with steam vulcanization (cure), reduces energy consumption; By the easy ageing failure of impact of High Temperature High Pressure, there is quick-fried tank phenomenon in Stamping Steel Ribbon during steam vulcanization (cure) in sulfurizing pot, causes personnel to injure and the scrapping of product in tank for a long time; And drying tunnel sulfuration reduces potential safety hazard, improve yield rate, cut the waste.Meanwhile, adopting the sebific duct of hot air drying tunnel sulfuration to carry out without the need to again putting into baking oven the performance requirement that post-cure can reach product, decreasing production process and energy consumption.
Compared with prior art, present embodiments provide a kind of method preparing turbine pressurized hose, the sebific duct of preparation is owing to having inside liner, impermeable layer and covering glue enhancement layer, beneficial effect is: because multiple glue-line is fit together by inside liner elastomeric compound and impervious barrier elastomeric compound, improve the adhesion between inside liner and impervious barrier; Improve ductility and the assembly performance of sebific duct; Reduce the risk of cold cracking and oil impregnate, protect the performance covering adhesive plaster enhancement layer further.
The performance of sebific duct prepared by application method of the present invention is carried out below by concrete Experimental comparison.
Test one
Weigh fluorine glue elastomeric compound and the fluorine silica gel elastomeric compound of identical weight number, between two roll gaps putting into tri-roll press machine respectively, calender nip is adjusted to formed objects, by calendering by two kinds of glue laminatings together, make the multiple glue-line that thickness is 0.8mm.Between two roll gaps aryl fiber cloth and silica gel elastomeric compound being put into respectively tri-roll press machine, by the mode of rubber, silica gel is attached in fibre cloth, make thickness be 1mm cover adhesive plaster enhancement layer.Require multiple glue-line according to product size and cover adhesive plaster and be cut into corresponding size.Mould is fixed on forming bench, multiple glue-line bag is attached on mould, by stainless steel round bar, seam crossing rolled smooth and drive bubble out of; At film face, with cloth inside, glue mode bag outside pastes 4 layers and covers adhesive plaster enhancement layer, by stainless steel round bar, seam crossing rolled smooth and drive bubble out of.Covering adhesive plaster outermost surface uniform winding one deck cellophane.The pipe of forming is put into 170 DEG C of hot air drying tunnel sulfuration 20min.Got off from the sebific duct surface solution vulcanizated by cellophane, taken off from mould by sebific duct with blowing type demoulding tooling, cleaning, excision stub bar, obtains finished product.
Comparative trial one
Fluorine glue elastomeric compound is put into tabletting machine and is pressed into the film that thickness is 0.8mm, silica gel elastomeric compound is put into tabletting machine and be pressed into the film that thickness is 0.5mm.Between two roll gaps aryl fiber cloth and silica gel elastomeric compound being put into respectively tri-roll press machine, by the mode of rubber, silica gel is attached in fibre cloth, make thickness be 1mm cover adhesive plaster enhancement layer.Require film according to product size and cover adhesive plaster and be cut into corresponding size.Mould is fixed on forming bench, fluorine Jiao Jiaopianbao is attached on mould, by stainless steel round bar, seam crossing rolled smooth and drive bubble out of; At film face, with cloth outside, glue mode bag inside pastes 4 layers and covers adhesive plaster enhancement layer, by stainless steel round bar, seam crossing rolled smooth and drive bubble out of; Cover adhesive plaster outermost surface bag and paste 1 layer of silica gel film, by stainless steel round bar, seam crossing rolled smooth and drive bubble out of.At Silica Surface uniform winding one deck cellophane.The pipe of forming is put into 170 DEG C of steam vulcanization (cure) kettle cure 20min.Got off from the sebific duct surface solution vulcanizated by cellophane, taken off from mould by sebific duct with blowing type demoulding tooling, cleaning, puts into 180 DEG C of baking ovens and carries out post-cure 120min, and excision stub bar, obtains finished product.
Comparative trial two
Fluorine silica gel elastomeric compound is put into tabletting machine and is pressed into the film that thickness is 0.8mm, silica gel elastomeric compound is put into tabletting machine and be pressed into the film that thickness is 0.5mm.Between two roll gaps aryl fiber cloth and silica gel elastomeric compound being put into respectively tri-roll press machine, by the mode of rubber, silica gel is attached in fibre cloth, make thickness be 1mm cover adhesive plaster enhancement layer.Require film according to product size and cover adhesive plaster and be cut into corresponding size.Mould is fixed on forming bench, fluorine silica gel film bag is attached on mould, by stainless steel round bar, seam crossing is rolled smooth and drive bubble out of; At film face, with cloth outside, glue mode bag inside pastes 4 layers and covers adhesive plaster enhancement layer, by stainless steel round bar, seam crossing rolled smooth and drive bubble out of; Cover adhesive plaster outermost surface bag and paste 1 layer of silica gel film, by stainless steel round bar, seam crossing rolled smooth and drive bubble out of.At Silica Surface uniform winding one deck cellophane.The pipe of forming is put into 170 DEG C of steam vulcanization (cure) kettle cure 20min.Got off from the sebific duct surface solution vulcanizated by cellophane, taken off from mould by sebific duct with blowing type demoulding tooling, cleaning, puts into 180 DEG C of baking ovens and carries out post-cure 120min, and excision stub bar, obtains finished product.
Performance comparison table
As can be seen from above-mentioned correlation data, before and after the aging of product of the test one adopting method of the present invention to do, all there is good adhesive property; There is good winter hardiness; Before and after resistance to machine oil, bursting pressure conservation rate is high; Production process is simple, low cost of manufacture.
In addition, sebific duct quality is light, and high resilience, has good bending properties, advantageously in assembling.
Although illustrate and describe the present invention with specific embodiment, however it will be appreciated that can to make when not deviating from the spirit and scope of the present invention many other change and amendment.Therefore, this means to comprise all such changes and modifications belonged in the scope of the invention in the following claims.
Claims (10)
1. a preparation method for turbine pressurized hose, is characterized in that, step is as follows:
(1) liner elastomeric compound and antiseepage elastomeric compound are fit together, make multiple glue-line;
(2) cloth rubberizing or rubber will be strengthened, and make and cover adhesive plaster enhancement layer;
(3) multiple glue-line is rolled into tubulose, seam crossing is rolled smooth and drives bubble away;
(4) will cover adhesive plaster enhanced layer packets is attached to outside multiple glue-line, rolls smooth and drive bubble away by seam crossing.
2. the preparation method of a kind of turbine pressurized hose according to claim 1, is characterized in that, the glue-line that described reinforcement cloth produces after rubberizing or rubber is positioned at the side of described reinforcement cloth away from described multiple glue-line.
3. the preparation method of a kind of turbine pressurized hose according to claim 2, is characterized in that, described reinforcement cloth is that cloth strengthened by aramid fiber or polyester.
4. the preparation method of a kind of turbine pressurized hose according to claim 2, is characterized in that, described glue-line is silica gel elastomeric compound.
5. the preparation method of a kind of turbine pressurized hose according to claim 1, is characterized in that, described in cover glue enhancement layer be 1-8 layer.
6. the preparation method of a kind of turbine pressurized hose according to claim 1, is characterized in that, after step (4) completes, is wound around one deck nylon water cloth or cellophane outward at the described glue enhancement layer that covers.
7. the preparation method of a kind of turbine pressurized hose according to claim 1, is characterized in that, described liner elastomeric compound is fluorine glue elastomeric compound.
8. the preparation method of a kind of turbine pressurized hose according to claim 1, is characterized in that, described antiseepage elastomeric compound is fluorine silica gel elastomeric compound.
9. the preparation method of a kind of turbine pressurized hose according to claim 1, is characterized in that, after step (4) completes, need carry out vulcanizing treatment to sebific duct.
10. a kind of turbine pressurized hose according to claim 9, is characterized in that, described sulfurize temperature is 160-180 degree Celsius, and cure time is 20-90 minute.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510956379.8A CN105351640A (en) | 2015-12-16 | 2015-12-16 | Preparation method of turbo-charging rubber pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510956379.8A CN105351640A (en) | 2015-12-16 | 2015-12-16 | Preparation method of turbo-charging rubber pipe |
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| CN105351640A true CN105351640A (en) | 2016-02-24 |
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| CN201510956379.8A Pending CN105351640A (en) | 2015-12-16 | 2015-12-16 | Preparation method of turbo-charging rubber pipe |
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| CN108730646A (en) * | 2017-04-25 | 2018-11-02 | 浙江久运车辆部件有限公司 | A kind of preparation method of engine charge reducing fabric sebific duct |
| CN114506125A (en) * | 2022-02-17 | 2022-05-17 | 山东驼风汽车科技股份有限公司 | Turbo-charging fluorine silicone tube of automobile air intake system and preparation method thereof |
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| CN114506125A (en) * | 2022-02-17 | 2022-05-17 | 山东驼风汽车科技股份有限公司 | Turbo-charging fluorine silicone tube of automobile air intake system and preparation method thereof |
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Application publication date: 20160224 |