CN112026216A - Surface treatment process for rubber connecting pipe of aircraft air conditioning system - Google Patents
Surface treatment process for rubber connecting pipe of aircraft air conditioning system Download PDFInfo
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- CN112026216A CN112026216A CN202010686387.6A CN202010686387A CN112026216A CN 112026216 A CN112026216 A CN 112026216A CN 202010686387 A CN202010686387 A CN 202010686387A CN 112026216 A CN112026216 A CN 112026216A
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- connecting pipe
- rubber
- surface treatment
- rubber connecting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
- C08J7/123—Treatment by wave energy or particle radiation
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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
- F16L11/12—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2309/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2309/02—Copolymers with acrylonitrile
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention relates to a surface treatment process of a rubber connecting pipe of an aircraft air conditioning system, which comprises the following specific steps: loading the remilled nitrile rubber 5860 mixed rubber into a preheated rubber mold for mold closing, mold pressing and vulcanizing; FN303 adhesive and XY403 adhesive are mixed according to the mass ratio of 3:1 to 4:1, mixing and preparing an adhesive; 6h after the rubber connecting pipe is subjected to mould pressing and vulcanization, the rubber connecting pipe is wiped and subjected to surface treatment by a plasma device. Compared with the prior art, the invention changes the traditional manual rubber surface polishing mode, uniformly improves the surface activity of the rubber, enhances the bonding strength between the rubber connecting pipe and the No. 18 undershirt cloth, simplifies the manufacturing process flow of the traditional rubber connecting pipe and shortens the manufacturing period of the rubber connecting pipe; meanwhile, after the surface of the rubber is treated by adopting the plasma surface, compressed air cleaning and alcohol wiping are not needed, so that the cost is effectively reduced, and the working efficiency and the surface treatment stability are improved.
Description
Technical Field
The invention relates to the technical field of manufacturing of rubber connecting pipes of aircraft air-conditioning systems, in particular to a surface treatment process for the rubber connecting pipes of the aircraft air-conditioning systems.
Background
The rubber connecting pipe of the aircraft air conditioning system has the characteristics of high flexibility and low rigidity, is arranged in an air conditioning pipeline, can be bent, expanded, stretched and compressed within a rated pressure range, and plays roles in reducing vibration and noise and preventing dust. The connecting pipe is mainly formed by molding butadiene-acrylonitrile rubber 5860 in a hot vulcanization mode, then the outer surface of the rubber is coated with an adhesive mixed by FN303 and XY403 according to the mass ratio of 3:1 to 4:1, and finally coated with No. 18 undershirt cloth.
The surface treatment process of the prior rubber connecting pipe after being coated with the adhesive and before being bonded with the No. 18 single jersey still adopts a manual polishing mode. The purpose of manual polishing is to polish the dust on the outer surface of the rubber connecting pipe, the aged surface layer and the release agent remained on the surface and seeping out of the surface, and the rubber surface generates certain roughness through the abrasive cloth with different particle sizes, so that the surface area is improved, the rubber connecting pipe and the adhesive/sweat cloth have certain anchoring effect, and the adhesive force and the bonding strength are improved. This method has certain disadvantages: firstly, the manual polishing speed is not controlled, the polishing is not uniform, the surface roughness of the rubber is easily uneven, and the rubber is easily damaged to cause dimension errors; secondly, dead angles exist in the polishing process, so that the rubber connecting pipe is glued with No. 18 single jersey and then is split; and thirdly, a certain amount of rubber powder particles or impurities are generated in the polishing process, secondary pollution is easy to form, and therefore, the surface is cleaned by blowing compressed air or wiping the surface by alcohol after polishing. Chinese patent CN201910650046.0 (published as 2019, 11/29) discloses a plasma-enhanced process for piston rod bonding, which is to adopt a plasma treatment method to enhance the bonding strength between a metal framework and a film for a metal bonding member of a piston rod, and the main technical point is to perform plasma treatment on a stainless steel piston rod and an unvulcanized film before mold pressing vulcanization. The defect is that the plasma strengthening treatment is not carried out on the vulcanized nitrile rubber and the No. 18 undershirt cloth. Chinese patent CN201910793891.3 (published as 2020, 1 month and 14 days) discloses a bonding method of a connecting pipe of an aircraft air conditioning system, which specifies the bonding method and the bonding steps of the connecting pipe, and has the technical key point that the mixture ratio of two adhesives, namely FN303 and XY403, is adopted, and the defect that the surface treatment is not carried out on the rubber connecting pipe before bonding.
Disclosure of Invention
In order to solve the technical problem, the invention provides a surface treatment process for a rubber connecting pipe of an aircraft air conditioning system, which is used for surface treatment of nitrile butadiene rubber 5860, changes the surface microstructure of the nitrile butadiene rubber and enhances the surface chemical activity.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a surface treatment process for a rubber connecting pipe of an aircraft air conditioning system comprises the following specific steps:
firstly, putting the remilled 5860 mixed rubber of nitrile rubber into a preheated rubber mould for mould closing, mould pressing and vulcanizing;
(II) mixing FN303 adhesive and XY403 adhesive according to the mass ratio of 3:1 to 4:1, mixing and preparing an adhesive;
thirdly, wiping and carrying out surface treatment on the rubber connecting pipe through plasma equipment 6 hours after the mould pressing vulcanization of the rubber connecting pipe is finished;
uniformly coating the surfaces of the rubber connecting pipe with the well plasma surface treatment and the No. 18 undershirt cloth with the prepared adhesive twice respectively;
tensioning and straightening the No. 18 undershirt cloth coated with the adhesive, and slowly spreading the undershirt cloth on the surface of the rubber connecting pipe until the No. 18 undershirt cloth completely covers the rubber connecting pipe;
and sixthly, placing the bonded rubber connecting pipe in an environment with the temperature of 23 +/-2 ℃ and the relative humidity of 45-55% for natural vulcanization.
Further, the parameters of the mold closing and molding vulcanization in the step (one) are as follows:
(a) vulcanization temperature: 151 +/-2 ℃;
(b) and (3) vulcanization time: 20 min;
(c) vulcanization pressure: 11 to 15 MPa.
And further, the process of preparing the adhesive in the step (II) comprises the steps of firstly stirring for 1min by using a glass rod, then adding a small amount of ethyl acetate for dilution, stirring uniformly again and then sealing for later use.
Further, the specific process of the plasma equipment in the step (three) for carrying out surface treatment on the rubber connecting pipe is as follows:
(A) evacuating the vacuum in the vacuum chamber to 10 Pa;
(B) keeping the pressure at about 100Pa, and introducing oxygen for plasma treatment into the vacuum chamber;
(C) oxygen plasma is generated by oxygen ionization in the vacuum chamber, and O in the oxygen plasma+、O-、O2+The plasma and the surface of the butadiene-acrylonitrile rubber generate certain physical and chemical actions to carry out surface treatment on the rubber connecting pipe.
Further, the process parameters of the plasma surface treatment performed by the plasma equipment in the step (three) are as follows:
(S1) medium gas: oxygen gas;
(S2) processing power: 200W;
(S3) processing time: 5 min;
(S4) aging property of the treatment: within 1 h.
And (3) further, after the first adhesive is coated in the step (four), placing for 15-25 min at room temperature, and after the second adhesive is coated, placing for 3-5 min at room temperature.
The invention has the beneficial effects that:
compared with the prior art, the invention changes the traditional manual rubber surface polishing mode, uniformly improves the surface activity of the rubber, enhances the bonding strength between the rubber connecting pipe and the No. 18 undershirt cloth, simplifies the manufacturing process flow of the traditional rubber connecting pipe and shortens the manufacturing period of the rubber connecting pipe; meanwhile, after the surface of the rubber is treated by adopting the plasma surface, compressed air cleaning and alcohol wiping are not needed, so that the cost is effectively reduced, and the working efficiency and the surface treatment stability are improved.
Drawings
The invention is further illustrated with reference to the following figures and examples:
FIG. 1 is a schematic view of the plasma surface treatment of a rubber connecting tube according to the present invention;
FIG. 2 is a flow chart of the manufacturing process of the rubber connecting tube of the present invention.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further explained in the following with the accompanying drawings and the embodiments.
FIG. 1 is a schematic view of the plasma surface treatment of a rubber connecting tube to be treated according to the present invention.
As shown in fig. 2, a surface treatment process for a rubber connecting pipe of an aircraft air conditioning system comprises the following specific steps:
and (I) putting the remilled nitrile-butadiene rubber 5860 mixed rubber into a preheated rubber mold for mold closing, mold pressing and vulcanizing.
Specifically, the parameters of the mold closing and molding vulcanization are as follows:
(a) vulcanization temperature: 151 +/-2 ℃;
(b) and (3) vulcanization time: 20 min;
(c) vulcanization pressure: 11 to 15 MPa.
The remilled nitrile rubber 5860 rubber compound is cut into blank pieces according to the shape of a connecting pipe on a pattern, the weight of the blank pieces is 105% -120% of the weight of a finished product, the thickness of the blank pieces is thicker than the cross section of the part, and the width of the blank pieces is narrower than the width of the part, so that gas is discharged conveniently. When the blank is loaded into the preheated rubber mold, attention should be paid to quickly, accurately and comfortably loading the blank into the rubber mold.
(II) mixing FN303 adhesive and XY403 adhesive according to the mass ratio of 3:1 to 4:1 to prepare the adhesive.
Specifically, the adhesive preparation process comprises the steps of firstly stirring for 1min by using a glass rod, adding a small amount of ethyl acetate for dilution, stirring uniformly again, and sealing for later use.
And (III) wiping and carrying out surface treatment on the rubber connecting pipe by using a plasma device 6h after the mould pressing vulcanization of the rubber connecting pipe is finished.
Specifically, after the rubber connecting pipe is subjected to mould pressing and vulcanization for 6 hours, removing redundant burrs on the surface of the rubber connecting pipe and wiping the surface of the rubber connecting pipe with alcohol. After the alcohol is completely dried, the rubber connecting pipe is placed into a vacuum chamber of plasma cleaning equipment for fixation, and the surface of the rubber is not contacted with any object and is completely exposed in the vacuum chamber.
The technological parameters of plasma surface treatment by the plasma equipment are as follows:
(S1) medium gas: oxygen gas;
(S2) processing power: 200W;
(S3) processing time: 5 min;
(S4) aging property of the treatment: within 1 h.
The specific process of the plasma equipment for carrying out surface treatment on the rubber connecting pipe comprises the following steps:
(A) evacuating the vacuum in the vacuum chamber to 10 Pa;
(B) keeping the pressure at about 100Pa, and introducing oxygen for plasma treatment into the vacuum chamber;
(C) oxygen plasma is generated by oxygen ionization in the vacuum chamber, and O in the oxygen plasma+、O-、O2+The plasma and the surface of the butadiene-acrylonitrile rubber generate certain physical and chemical actions to carry out surface treatment on the rubber connecting pipe.
The action principle of the ionic surface treatment of the rubber connecting pipe is as follows: the outer surface of the rubber connecting pipe is fully exposed to plasma (high-energy electrons, positive and negative ions and neutral ions) of non-polymeric gas, and the high-energy plasma is utilized to violently impact the surface of the nitrile rubber 5860. The surface of the nitrile rubber 5860 has chemical bonds such as C-H, C-O, C-C, and the energy of plasma energetic particles is slightly higher than the energy of the chemical bonds, so that the chemical bonds on the surface of the nitrile rubber 5860 are broken and recombined to generate a large number of polar groups by plasma surface treatment, and the rubber surface is structurally modified to enhance the surface chemical activity.
The method has the following advantages: firstly, the surface of the butadiene-acrylonitrile rubber 5860 after plasma surface treatment does not generate rubber powder particles, impurities and other residual substances, and compressed air or alcohol is not needed for cleaning; and secondly, the surface of the rubber is treated by plasma surface treatment, the surface treatment is uniform, the problem of dead angle treatment or treatment failure is solved, and the rubber part is not damaged.
And (IV) uniformly coating the surfaces of the rubber connecting pipe and the No. 18 undershirt cloth which are subjected to the plasma surface treatment with the prepared adhesive twice.
And after the first adhesive is coated, the coating is placed at room temperature for 15-25 min, and after the second adhesive is coated, the coating is placed at room temperature for 3-5 min.
And (V) tightening and straightening the No. 18 undershirt cloth coated with the adhesive, and slowly spreading the undershirt cloth on the surface of the rubber connecting pipe until the No. 18 undershirt cloth completely covers the rubber connecting pipe.
And sixthly, placing the bonded rubber connecting pipe in an environment with the temperature of 23 +/-2 ℃ and the relative humidity of 45-55% for natural vulcanization.
Through the treatment process, the traditional manual rubber surface polishing mode is changed, the surface activity of the rubber is uniformly improved, the bonding strength between the rubber connecting pipe and the No. 18 undershirt cloth is enhanced, the manufacturing process flow of the traditional rubber connecting pipe is simplified, and the manufacturing period of the rubber connecting pipe is shortened; meanwhile, after the surface of the rubber is treated by adopting the plasma surface, compressed air cleaning and alcohol wiping are not needed, so that the cost is effectively reduced, and the working efficiency and the surface treatment stability are improved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A surface treatment process for a rubber connecting pipe of an aircraft air conditioning system is characterized by comprising the following steps: the method comprises the following specific steps:
firstly, putting the remilled 5860 mixed rubber of nitrile rubber into a preheated rubber mould for mould closing, mould pressing and vulcanizing;
(II) mixing FN303 adhesive and XY403 adhesive according to the mass ratio of 3:1 to 4:1, mixing and preparing an adhesive;
thirdly, wiping and carrying out surface treatment on the rubber connecting pipe through plasma equipment 6 hours after the mould pressing vulcanization of the rubber connecting pipe is finished;
uniformly coating the surfaces of the rubber connecting pipe with the well plasma surface treatment and the No. 18 undershirt cloth with the prepared adhesive twice respectively;
tensioning and straightening the No. 18 undershirt cloth coated with the adhesive, and slowly spreading the undershirt cloth on the surface of the rubber connecting pipe until the No. 18 undershirt cloth completely covers the rubber connecting pipe;
and sixthly, placing the bonded rubber connecting pipe in an environment with the temperature of 23 +/-2 ℃ and the relative humidity of 45-55% for natural vulcanization.
2. The surface treatment process of the rubber connecting pipe of the air conditioning system of the aircraft as claimed in claim 1, wherein the surface treatment process comprises the following steps: the parameters of die closing, die pressing and vulcanizing in the step (I) are as follows:
(a) vulcanization temperature: 151 +/-2 ℃;
(b) and (3) vulcanization time: 20 min;
(c) vulcanization pressure: 11 to 15 MPa.
3. The surface treatment process of the rubber connecting pipe of the air conditioning system of the aircraft as claimed in claim 1, wherein the surface treatment process comprises the following steps: and (2) stirring for 1min by using a glass rod, adding a small amount of ethyl acetate for dilution, stirring uniformly again, and sealing for later use.
4. The surface treatment process of the rubber connecting pipe of the air conditioning system of the aircraft as claimed in claim 1, wherein the surface treatment process comprises the following steps: the specific process of the plasma equipment for carrying out surface treatment on the rubber connecting pipe in the step (III) is as follows:
(A) evacuating the vacuum in the vacuum chamber to 10 Pa;
(B) keeping the pressure at about 100Pa, and introducing oxygen for plasma treatment into the vacuum chamber;
(C) oxygen plasma is generated by oxygen ionization in the vacuum chamber, and O in the oxygen plasma+、O-、O2+The plasma and the surface of the butadiene-acrylonitrile rubber generate certain physical and chemical actions to carry out surface treatment on the rubber connecting pipe.
5. The surface treatment process of the rubber connecting pipe of the air conditioning system of the aircraft as claimed in claim 1, wherein the surface treatment process comprises the following steps: the technological parameters of plasma surface treatment of the plasma equipment in the step (three) are as follows:
(S1) medium gas: oxygen gas;
(S2) processing power: 200W;
(S3) processing time: 5 min;
(S4) aging property of the treatment: within 1 h.
6. The surface treatment process of the rubber connecting pipe of the air conditioning system of the aircraft as claimed in claim 1, wherein the surface treatment process comprises the following steps: and (IV) after the first adhesive is coated, standing at room temperature for 15-25 min, and after the second adhesive is coated, standing at room temperature for 3-5 min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010686387.6A CN112026216A (en) | 2020-07-16 | 2020-07-16 | Surface treatment process for rubber connecting pipe of aircraft air conditioning system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010686387.6A CN112026216A (en) | 2020-07-16 | 2020-07-16 | Surface treatment process for rubber connecting pipe of aircraft air conditioning system |
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| CN202010686387.6A Pending CN112026216A (en) | 2020-07-16 | 2020-07-16 | Surface treatment process for rubber connecting pipe of aircraft air conditioning system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0788870A2 (en) * | 1996-02-08 | 1997-08-13 | Bridgestone Corporation | Process for surface treatment of vulcanized rubber and process for production of rubber-based composite material |
| CN104987518A (en) * | 2015-08-06 | 2015-10-21 | 南昌航空大学 | Method for improving adhesive property by processing chemigum through low temperature plasma using oxygen as medium |
| CN110682543A (en) * | 2019-08-27 | 2020-01-14 | 国营芜湖机械厂 | Method for bonding connecting pipe of aircraft air conditioning system |
-
2020
- 2020-07-16 CN CN202010686387.6A patent/CN112026216A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0788870A2 (en) * | 1996-02-08 | 1997-08-13 | Bridgestone Corporation | Process for surface treatment of vulcanized rubber and process for production of rubber-based composite material |
| CN104987518A (en) * | 2015-08-06 | 2015-10-21 | 南昌航空大学 | Method for improving adhesive property by processing chemigum through low temperature plasma using oxygen as medium |
| CN110682543A (en) * | 2019-08-27 | 2020-01-14 | 国营芜湖机械厂 | Method for bonding connecting pipe of aircraft air conditioning system |
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Application publication date: 20201204 |