CN108251055A - A kind of aircraft seals assembling microcapsules sealant and preparation method - Google Patents
A kind of aircraft seals assembling microcapsules sealant and preparation method Download PDFInfo
- Publication number
- CN108251055A CN108251055A CN201711337590.7A CN201711337590A CN108251055A CN 108251055 A CN108251055 A CN 108251055A CN 201711337590 A CN201711337590 A CN 201711337590A CN 108251055 A CN108251055 A CN 108251055A
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- China
- Prior art keywords
- sealant
- aircraft
- microcapsules
- assembling
- urea
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K3/1025—Materials in mouldable or extrudable form for sealing or packing joints or covers characterised by non-chemical features of one or more of its constituents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2003/1034—Materials or components characterised by specific properties
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
- C09K2200/0645—Macromolecular organic compounds, e.g. prepolymers obtained otherwise than by reactions involving carbon-to-carbon unsaturated bonds
- C09K2200/067—Condensation polymers of aldehydes or ketones
- C09K2200/0677—Urea-formaldehyde condensation polymers
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing Of Micro-Capsules (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention belongs to aircraft sealing mounting technology fields, are related to a kind of aircraft sealing assembling microcapsules sealing agent and preparation method.By the destrabilizing moment and the measure of dismounting force moment to sealant, to verify whether sealant can reach corresponding production requirement.Compare the torque test data of uncoated, dry film assembling, wet film assembling, it can be seen that the destrabilizing moment and dismounting force moment size that uncoated sealant and dry film assemble are basically identical, when torque is stablized, destrabilizing moment and dismounting force moment can reach the 89% and 108% of uncoated sealant respectively, this show the sealant moment properties of microencapsulation it is basic with it is uncoated preceding consistent.Meanwhile microcapsules sealant can greatly reduce working hour and process, can by traditional mixed glue, dip in glue, 4 assembling, removing glue processes are reduced to 1 process of assembling.
Description
Technical field
The invention belongs to aircraft sealing mounting technology fields, are related to a kind of aircraft sealing assembling microcapsules sealing agent
And preparation method.
Background technology
Aircraft is in coastal area in use, being experienced by high/low temperature, damp and hot, salt fog, illumination, chemical contamination, sleet, greasy weather
And the effect of the exceedingly odious marine environment such as seawater sputtering, it be easy to cause its housing construction, system, electronic equipment and into attachment
Corrosion, seriously affect the structural intergrity and functionality of aircraft, in order to slow down and control corrosion rate, need close to aircraft anticorrosion
It seals that corrosive medium is isolated.
Current aircraft sealing assembling is main to dip in the wet assembling of sealant progress using fastener, and process is relatively complicated, including
Mixed glue dips in glue, assembling, removing glue Four processes, and processing quality is affected by artificial proficiency.
Invention content
The purpose of the present invention
The microcapsules sealing agent of the present invention refers to, by the curing agent and host agent in the used two-component sealant of aircraft
It is respectively coated by by microcapsules technology, and is coated in fastener fitting surface in advance, when component assembly, microcapsules is caused to break due to squeezing
It splits, each component reaction curing, reaches the locking and sealing of part in pre- gluing.
Technical scheme of the present invention：A kind of aircraft seals assembling microcapsules sealant, which is characterized in that is showed based on aircraft
Some two-component polysulfide sealant P/S 870B-2,, will be existing by in-situ polymerization using urea formaldehyde polymer as microcapsule wall material
There are two-component sealant P/S 870B-2 to be coated in ureaformaldehyde high molecular polymer.
The urea formaldehyde polymer includes formaldehyde and urea.
A kind of aircraft seals assembling microcapsules sealing agent preparation method：
The first step：Two-component polysulfide sealant with diluent is dissolved, forms sealant solution；
Second step：The urea-formaldehyde prepolymer of synthesizing water-solubility under alkaline condition；
Third walks：Dispersant is added in sealant solution, it is made to be uniformly dispersed；
4th step：Urea-formaldehyde prepolymer solution is added in finely dispersed sealant solution, adds dilute sulfuric acid
Stirring and adjusting 5 minutes, after the pH value 3-5 of polymeric reaction solution, adding in sodium hydroxide and continuing stirring makes pH value reach 8-9, polymerize
Reaction 4 hours；
5th step：With the continuous progress of reaction, polycondensation reaction further occurs for water-soluble urea-formaldehyde prepolymer, and is formed
The water-insoluble uramit of cross-linked structure, is gradually deposited at capsule-core surface, and microcapsules are formed after capsule-core is coated.
The dispersant stabilizer is 1.5%PVA-124
The polymerisation mixing speed：600-800rpm, temperature：60 DEG C, the time：4 hours
The diluent is toluene
Beneficial effects of the present invention：The moment properties of sealant be a major criterion in rubber mechanical property and
Identify one of effective ways of sealing article sealing performance.By the destrabilizing moment and the measure of dismounting force moment to sealant, come
Whether verification sealant can reach corresponding production requirement.Compare the torque test number of uncoated, dry film assembling, wet film assembling
The destrabilizing moment and dismounting force moment size assembled according to, it can be seen that uncoated sealant and dry film are basically identical, work as torque
When stablizing, destrabilizing moment and dismounting force moment can reach the 89% and 108% of uncoated sealant respectively, this shows microencapsulation
Sealant moment properties it is basic with it is uncoated preceding consistent.Meanwhile microcapsules sealant can greatly reduce working hour and process, can incite somebody to action
Traditional mixed glue, dip in glue, 4 assembling, removing glue processes are reduced to 1 process of assembling.
Description of the drawings
Fig. 1 is with the situation of change of the increase destrabilizing moment of vulcanization time
Fig. 2 is with the situation of change of the increase dismounting force moment of vulcanization time
Fig. 3 microcapsules sealant technology paths
Polysulfide sealant surface of microcapsule pattern photo during Fig. 4 differential responses times
Microcapsule granule punctures front and rear surfaces photo after Fig. 5 polymerisations 6 hours
Specific embodiment
As shown in figure 3, the technical problems to be solved by the invention are that prepare a kind of aircraft sealing assembling microcapsules close
Agent is sealed, which also has the characteristics that coat in advance in addition to sealing function possessed by general sealant, main
Principle is exactly the selection by suitable covering material and technology path, by the host agent in aircraft at present existing two-component sealant and
Curing agent is respectively coated by suitable high molecular polymer, is realized covering material and is wrapped by organic between sealant compositions
With reference to solving the compatibility issue between the two, must live, not reveal and constant so as to ensureing to be wrapped by sealant active constituent packet
Property.Then by coating polymerisation material factor (diluent and dispersant, emulsifier, polymerized monomer dosage and capsule-core dosage
Ratio etc.) with polymerization considerations (reaction temperature, reaction time and stir speed (S.S.) etc.) to prepared cladding sealant grain structure, shape
The discussion of the performances affecting laws such as looks, particle size distribution, obtains the technical matters for microcapsules sealant.
Microcapsules sealant prepared by the present invention is based on the existing two-component polysulfide sealant of aircraft (870 B-2 of P/S)
It prepares, using urea formaldehyde polymer as cyst wall covering material, by in-situ polymerization, by existing two-component sealant (P/S 870B-
2) it is coated in ureaformaldehyde high molecular polymer.Basic principle is sealant ingredient, wall material monomer and the catalyst that will intend cladding
It is dissolved or dispersed in same phase, causes monomer under the action of certain catalyst and polymerisation occurs, when polymerisation starts
Afterwards, wall material monomer gradually polymerize, and molecular weight incrementally increases, and the solubility in phase is dissolved continuously decreases, so that finally not
The particle surface formation wall film of capsule-core formation can be dissolved and detach and be deposited on from dissolving phase, and then capsule-core substance is coated
To form microcapsules.
Microcapsules sealant preparation method is as follows：
Microcapsule wall material：It is prepared using formaldehyde and urea as raw material using in-situ polymerization technology
Capsule core material and wall material mass ratio are ranging from：1.6-2.3
Dispersant：1.5%PVA-124
Diluent：Toluene
Aggressiveness reacts mixing speed：600-800rpm
Polymerisation pH value：PH=2-4
Catalyst：Sodium hydroxide
Polymeric reaction temperature：60℃
Polymerization reaction time：4 hours
Present case is with reference to program described above to obtaining following result after dilution of sealant, dispersion, cladding：
Polysulfide sealant surface of microcapsule pattern photo when Fig. 4 is the differential responses time.As can be seen that with the reaction time
Gradually extend, the microcapsule granule shape comparison rule formed, sphericity increases, and granular size variation is little, between particle
Do not occur bonding phenomenon.But extend with the reaction time, the roughness of surface of microcapsule increases, this is because surface grow it is more next
More thorn-like ureaformaldehyde condensates.The increase of surface roughness can increase the surface area of capsule, improve its surface adhesion, will
Be conducive to it combination or surface between binding agent be adsorbable inlay other molecules.
Fig. 5 be polymerisation after 6 hours microcapsule granule artificially puncture front and rear surface picture, it can be seen that microcapsules
Before puncturing, surface is more mellow and full, and shape is regular, after being punctured, can significantly observe capsule-core polysulfide rubber under the microscope
Flow outwardly, show that polysulfide rubber is coated in capsule completely, and the shape for puncturing rear capsule do not occur such as to collapse,
Phenomena such as deformation, shows that cyst wall has certain intensity and toughness.
It is required according to Seal Design, the mixture of sealant and adhesive is coated in designated position, in 25 DEG C of baking ovens
Drying is for use.
Claims (6)
1. a kind of aircraft seals assembling microcapsules sealant, which is characterized in that based on the existing two-component polysulfide sealing of aircraft
870 B-2 of agent P/S, using urea formaldehyde polymer as microcapsule wall material, by in-situ polymerization, by existing two-component sealant P/S
870 B-2 are coated in ureaformaldehyde high molecular polymer.
2. aircraft as described in claim 1 seals assembling microcapsules sealant, which is characterized in that the urea formaldehyde polymer packet
Include formaldehyde and urea.
3. a kind of aircraft seals assembling microcapsules sealing agent preparation method：
The first step：Two-component polysulfide sealant with diluent is dissolved, forms sealant solution；
Second step：The urea-formaldehyde prepolymer of synthesizing water-solubility under alkaline condition；
Third walks：Dispersant is added in sealant solution, it is made to be uniformly dispersed；
4th step：Urea-formaldehyde prepolymer solution is added in finely dispersed sealant solution, adds dilute sulfuric acid stirring
It adjusts 5 minutes, after the pH value 3-5 of polymeric reaction solution, addition sodium hydroxide, which continues stirring, makes pH value reach 8-9, polymerisation 4
Hour；
5th step：With the continuous progress of reaction, polycondensation reaction further occurs for water-soluble urea-formaldehyde prepolymer, and forms crosslinking
The water-insoluble uramit of reticular structure, is gradually deposited at capsule-core surface, and microcapsules are formed after capsule-core is coated.
4. aircraft as claimed in claim 3 seals assembling microcapsules sealing agent preparation method, which is characterized in that described
Dispersant stabilizer is 1.5%PVA-124.
5. the aircraft sealing assembling microcapsules sealing agent preparation method as described in claim 3 or 4, which is characterized in that
The polymerisation mixing speed：600-800rpm, temperature：60 DEG C, the time：4 hours.
6. aircraft as claimed in claim 5 seals assembling microcapsules sealing agent preparation method, which is characterized in that described
Diluent is toluene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711337590.7A CN108251055A (en) | 2017-12-13 | 2017-12-13 | A kind of aircraft seals assembling microcapsules sealant and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711337590.7A CN108251055A (en) | 2017-12-13 | 2017-12-13 | A kind of aircraft seals assembling microcapsules sealant and preparation method |
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| Publication Number | Publication Date |
|---|---|
| CN108251055A true CN108251055A (en) | 2018-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711337590.7A Pending CN108251055A (en) | 2017-12-13 | 2017-12-13 | A kind of aircraft seals assembling microcapsules sealant and preparation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319285A (en) * | 2019-07-22 | 2019-10-11 | 哈尔滨工业大学 | It is a kind of deformable from connection selfreparing pipeline |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2158219B2 (en) * | 1970-11-25 | 1975-08-28 | Jointine Products Co. Ltd., Lincoln, Lincolnshire (Grossbritannien) | Flat seal |
| CN106281000A (en) * | 2015-12-30 | 2017-01-04 | 中国特种飞行器研究所 | Microcapsule selfreparing organic/inorganic polysiloxane coating materials and processing method |
| CN106978131A (en) * | 2017-05-08 | 2017-07-25 | 中国科学院金属研究所 | Polysulfide sealant microcapsules and its preparation method and application |
-
2017
- 2017-12-13 CN CN201711337590.7A patent/CN108251055A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2158219B2 (en) * | 1970-11-25 | 1975-08-28 | Jointine Products Co. Ltd., Lincoln, Lincolnshire (Grossbritannien) | Flat seal |
| CN106281000A (en) * | 2015-12-30 | 2017-01-04 | 中国特种飞行器研究所 | Microcapsule selfreparing organic/inorganic polysiloxane coating materials and processing method |
| CN106978131A (en) * | 2017-05-08 | 2017-07-25 | 中国科学院金属研究所 | Polysulfide sealant microcapsules and its preparation method and application |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319285A (en) * | 2019-07-22 | 2019-10-11 | 哈尔滨工业大学 | It is a kind of deformable from connection selfreparing pipeline |
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Application publication date: 20180706 |