CN106840538A - A kind of method that utilization pressure-sensitive material detects vacuum bag film air leakage point - Google Patents
A kind of method that utilization pressure-sensitive material detects vacuum bag film air leakage point Download PDFInfo
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- CN106840538A CN106840538A CN201710233230.6A CN201710233230A CN106840538A CN 106840538 A CN106840538 A CN 106840538A CN 201710233230 A CN201710233230 A CN 201710233230A CN 106840538 A CN106840538 A CN 106840538A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
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Abstract
The present invention relates to a kind of method that utilization pressure-sensitive material detects vacuum bag film air leakage point, pressure-sensitive material is added in vacuum bag film, then the pressure differential inside and outside regulation vacuum bag film is more than or equal to critical pressure, it was observed that the point as air leakage point that does not change of color, wherein critical pressure is the pressure for instigating pressure-sensitive material that color change takes place, pressure-sensitive material is the polymer containing spiro-pyrans, its degree of polymerization >=5, the present invention can be according to the change of vacuum bag film ambient pressure, the air-tightness of automatic detection itself, largely use manpower and material resources sparingly, the accurate place for rapidly finding out gas leakage, make remedial measure in time, ensure the briquetting pressure of composite element, save production cost, improve production efficiency, with Industry Promotion advantage.
Description
Technical field
The invention belongs to the air-leakage test field of vacuum bag film, it is related to a kind of using pressure-sensitive material detection vacuum
The method of bag film air leakage point.
Background technology
Demand with composite element in fields such as Aero-Space, ship, trains is increasing, and it was molded
The performance requirement of used auxiliary material is also higher in journey.Vacuum bag film is using autoclave molding or vacuum assisted resin infusion system
A kind of vacuum aided material of standby composite element, it together with sealant tape for composite provide one it is vacuum-tight
Environment, is compacted by vacuumizing to component, it is ensured that briquetting pressure.But in the production process of vacuum bag film, it is easy to
There is trachoma, trachoma cannot with the naked eye be observed, so in the manufacturing process of composite element, vacuum bag film is easy to out
The phenomenons such as existing gas leakage, quick-fried bag, cause that internal soundness defect occurs in the composite element after solidification or dry spot, poor occurs in surface
The phenomenons such as glue, influence product quality.Therefore, the air-tightness of vacuum bag film is studied, it is ensured that it occurs without gas leakage in use
Phenomenon has very important realistic meaning.
When large-scale composite material component is manufactured, the airtight of vacuum bag film is checked through the method frequently with hand inspection
Property, judge by pressurize situation vacuum bag film whether gas leakage, but find out the place of gas leakage but relatively hard not only time-consuming expense
Power, and it is unable to reach satisfied Detection results.
Wang Weishan etc. (two methods of Wang Weishan, Zhao Jiang food industry science and technology [J] gas permeability tests compare,
2008,(29):283-284) describe the two methods of the air-leakage test of vacuum bag film, mainly pressure differential method and equal-pressure method.
Equal-pressure method mainly uses sensor, for the air-leakage test experiment of oxygen, permeation chamber is divided into two relatively using sample
Independent air flow system, side is the dry test gas (oxygen or the mixed gas containing oxygen) of flowing, and opposite side is flowing
Dry gas (nitrogen), sample both sides pressure is equal, but oxygen partial pressure is different.In the presence of oxygen partial pressure, oxygen is passed through
Film simultaneously delivers to sensor by stream of nitrogen gas, by sensor accurately measures the amount of oxygen carried in stream of nitrogen gas, so that
Go out gas permeability of the film for oxygen, but gas permeability of the film for other gases in air cannot be drawn, using with limitation
Property；Pressure differential method is that permeation chamber is divided into two independent spaces using sample, first sample both sides is all evacuated, then to it
The test gas of 0.1MPa is poured in middle side, and opposite side then continues to keep vacuum state.0.1MPa is formed in sample both sides
Test gas draught head, test gas permeation film enters low-pressure side, and causes the variable quantity of gas low pressure lateral pressure,
The change of low-pressure lateral pressure is measured by high accuracy manometer, the air-tightness of vacuum bag film is detected, pressure differential method has for surveying
Without selectivity, test result do not influenceed gas testing body by foreign gas, and with testing cost is low, success of the test rate is high, but
The position that film leaks air cannot be accurately tested out, remedial measure is made in time.
Therefore, a kind of place that can accurately detect the air-tightness of vacuum bag film, and gas leakage can be rapidly found out is invented,
The method for making remedial measure in time is significant.
The content of the invention
The invention aims to overcome prior art accurately to detect the shortcoming of air leakage point, there is provided one kind is using pressure
The method that power responsive type material detects vacuum bag film air leakage point, pressure-sensitive material is added in vacuum bag film, is then constantly increased
Pressure differential inside and outside big vacuum bag film, under pressure vacuum bag film color change can occur, at air leakage point due to
Air is communicated, the effect of not being stressed, thus color change will not occur, and the inspection of air leakage point is capable of achieving by observing color change
Survey.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of method that utilization pressure-sensitive material detects vacuum bag film air leakage point, pressure-sensitive material is added to
In vacuum bag film, then adjust vacuum bag film inside and outside pressure differential be more than or equal to critical pressure, it was observed that color do not send out
The point as air leakage point of changing；
The critical pressure is the pressure for instigating pressure-sensitive material that color change takes place, and the color change exists
In naked eyes visible range.
As preferred technical scheme：
The method that a kind of utilization pressure-sensitive material as described above detects vacuum bag film air leakage point, the vacuum bag film
It is monofilm or multilayer film, wherein multilayer film is the film of the number of plies >=2.
The method that a kind of utilization pressure-sensitive material as described above detects vacuum bag film air leakage point, the presser sensor
Type material is dispersed in any in one or more layers of vacuum bag film.
The method that a kind of utilization pressure-sensitive material as described above detects vacuum bag film air leakage point, contains presser sensor
The content of pressure-sensitive material is 0.1~5wt% in the film layer of type material, and the content of pressure-sensitive material is too low, color
Not substantially, content is too high, can influence the physical property of vacuum bag film for change.
The method that a kind of utilization pressure-sensitive material as described above detects vacuum bag film air leakage point, by pressure-sensitive
The method that material is added in vacuum bag film is：The beads fuse blending of pressure-sensitive material and vacuum bag film is obtained into grain
Material, the pellet for then obtaining melt blending is directly extruded or multi-layer co-extruded with the pellet of vacuum bag film compound.
The method that a kind of utilization pressure-sensitive material as described above detects vacuum bag film air leakage point, the regulation vacuum
Pressure differential inside and outside bag film uses the method for vacuumizing or being pressed into gas.
The method that a kind of utilization pressure-sensitive material as described above detects vacuum bag film air leakage point, the critical pressure
It is 0.06~0.1MPa.
The method that a kind of utilization pressure-sensitive material as described above detects vacuum bag film air leakage point, the presser sensor
Type material is the polymer containing spiro-pyrans.
The method that a kind of utilization pressure-sensitive material as described above detects vacuum bag film air leakage point, it is described containing spiro-pyrans
Polymer structural formula it is as follows：
In formula, n represents the degree of polymerization of the polymer containing spiro-pyrans, n >=5.
The method that a kind of utilization pressure-sensitive material as described above detects vacuum bag film air leakage point, the color change
Refer to be changed into aubergine from light yellow.
Reaction mechanism：
Polymer containing spiro-pyrans is pressure-sensitive material, when the pressure that it is born is less than critical pressure, its face
Color is light yellow, and when the pressure that it is born is optionally greater than critical pressure, its color is aubergine, its Discoloration mechanism such as following formula
It is shown：
F representative pressures in formula；
The present invention is there is difference with gastight local compression situation according to gas leakage, and pyrrole containing spiral shell is added in vacuum bag film
The polymer muttered realizes gas leakage self-checking function.Piezallochromy material is added in vacuum bag film, once vacuum bag film gas leakage, leakage
Because the not effect of being stressed, color does not change in the place of gas.And it is gastight local because being acted on by vacuum pressure,
Color is changed, and can rapidly find out the place of gas leakage, and remedial measure is made in time.
Beneficial effect：
(1) present invention is a kind of method that utilization piezallochromy material detects vacuum bag film gas leakage, and vacuum bag film being capable of root
According to the change of vacuum bag film ambient pressure, the air-tightness of automatic detection itself largely saves man power and material；
(2) present invention is a kind of method that utilization piezallochromy material detects vacuum bag film gas leakage, overall flow length and
Technique controlling difficulty is moderate, with high efficiency；
(3) present invention is that a kind of method of utilization piezallochromy material detection vacuum bag film gas leakage can accurately rapidly find out
The place of gas leakage, makes remedial measure in time, it is ensured that the briquetting pressure of composite element, saves production cost, improves production
Efficiency, with Industry Promotion advantage.
Specific embodiment
The invention will be further elucidated with reference to specific embodiments.It should be understood that these embodiments are merely to illustrate this hair
Bright rather than limitation the scope of the present invention.In addition, it is to be understood that after the content for having read instruction of the present invention, art technology
Personnel can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited
Fixed scope.
Embodiment 1
A kind of method that utilization pressure-sensitive material detects vacuum bag film air leakage point, its step is as follows：
(1) polymer containing spiro-pyrans that the degree of polymerization is 5 is obtained into pellet with the beads fuse blending of vacuum bag film, then
Directly extrusion is obtained vacuum bag monofilm to the pellet that melt blending is obtained, and the polymer uniform containing spiro-pyrans is dispersed in vacuum bag
In monofilm, the content of the polymer containing spiro-pyrans is 5wt% in vacuum bag monofilm, and the polymer color for containing spiro-pyrans is opened
Beginning changes the pressure for needing to apply for 0.06MPa, and the structural formula that this contains the polymer of spiro-pyrans is as follows：
(2) pressure differential that the method by vacuumizing adjusts inside and outside vacuum bag film is 0.06MPa, observes vacuum bag film
Whether have color change, air tight position should be changed into aubergine from light yellow, Gas leak position due to being connected with opposite side, pressure
Smaller, color is still in faint yellow, that is, the point as air leakage point that the color observed does not change.
Embodiment 2
A kind of method that utilization pressure-sensitive material detects vacuum bag film air leakage point, its step is as follows：
(1) polymer containing spiro-pyrans that the degree of polymerization is 6 is obtained into pellet with the beads fuse blending of vacuum bag film, then
Directly extrusion is obtained vacuum bag monofilm to the pellet that melt blending is obtained, and the polymer uniform containing spiro-pyrans is dispersed in vacuum bag
In monofilm, the content of the polymer containing spiro-pyrans is 0.1wt% in vacuum bag monofilm, and this contains the polymer color of spiro-pyrans
It is 0.1MPa that change takes place to need the pressure for applying, and the structural formula that this contains the polymer of spiro-pyrans is as follows：
(2) pressure differential for being adjusted inside and outside vacuum bag film by being pressed into the method for gas is 0.1MPa, observes vacuum bag
Whether film has color change, and air tight position should be changed into aubergine from light yellow, and Gas leak position is pressed due to being connected with opposite side
Power is smaller, and color is still in faint yellow, that is, the point as air leakage point that the color observed does not change.
Embodiment 3
A kind of method that utilization pressure-sensitive material detects vacuum bag film air leakage point, its step is as follows：
(1) polymer containing spiro-pyrans that the degree of polymerization is 7 is obtained into pellet with the beads fuse blending of vacuum bag film, then
The pellet that melt blending is obtained is three-layer co-extruded with the pellet of vacuum bag film to be gone out to be combined prepared vacuum bag trilamellar membrane, containing spiro-pyrans
Polymer uniform is dispersed in the intermediate layer of vacuum bag trilamellar membrane, and the content of the polymer containing spiro-pyrans is in intermediate layer
2.55wt%, the pressure that the polymer color for containing spiro-pyrans takes place change needs applying is 0.08MPa, and this contains spiro-pyrans
Polymer structural formula it is as follows：
(2) pressure differential for being adjusted inside and outside vacuum bag film by being pressed into the method for gas is 0.1MPa, observes vacuum bag
Whether film has color change, and air tight position should be changed into aubergine from light yellow, and Gas leak position is pressed due to being connected with opposite side
Power is smaller, and color is still in faint yellow, that is, the point as air leakage point that the color observed does not change.
Embodiment 4
A kind of method that utilization pressure-sensitive material detects vacuum bag film air leakage point, its step is as follows：
(1) polymer containing spiro-pyrans that the degree of polymerization is 8 is obtained into pellet with the beads fuse blending of vacuum bag film, then
The pellet that melt blending is obtained is coextruded compound prepared vacuum bag duplicature with the pellet two-layer of vacuum bag film, containing spiro-pyrans
Polymer uniform is dispersed in the layer of vacuum bag film, and the content of the polymer containing spiro-pyrans is 2.7wt% in layer, should
It is 0.08MPa that change takes place to need the pressure for applying for polymer color containing spiro-pyrans, and this contains the polymer of spiro-pyrans
Structural formula is as follows：
(2) pressure differential for being adjusted inside and outside vacuum bag film by being pressed into the method for gas is 0.1MPa, observes vacuum bag
Whether film has color change, and air tight position should be changed into aubergine from light yellow, and Gas leak position is pressed due to being connected with opposite side
Power is smaller, and color is still in faint yellow, that is, the point as air leakage point that the color observed does not change.
Embodiment 5
A kind of method that utilization pressure-sensitive material detects vacuum bag film air leakage point, its step is as follows：
(1) polymer containing spiro-pyrans that the degree of polymerization is 9 is obtained into pellet with the beads fuse blending of vacuum bag film, then
The pellet that melt blending is obtained is coextruded the compound prepared tunic of vacuum bag four with four layers of the pellet of vacuum bag film, containing spiro-pyrans
Polymer uniform is dispersed in the upper epidermis of vacuum bag film, and the content of the polymer containing spiro-pyrans is 0.5wt% in upper epidermis, should
It is 0.1MPa that change takes place to need the pressure for applying for the color of the polymer containing spiro-pyrans, and this contains the polymer of spiro-pyrans
Structural formula is as follows：
(2) pressure differential for being adjusted inside and outside vacuum bag film by being pressed into the method for gas is 0.1MPa, observes vacuum bag
Whether film has color change, and air tight position should be changed into aubergine from light yellow, and Gas leak position is pressed due to being connected with opposite side
Power is smaller, and color is still in faint yellow, that is, the point as air leakage point that the color observed does not change.
Embodiment 6
A kind of method that utilization pressure-sensitive material detects vacuum bag film air leakage point, its step is as follows：
(1) polymer containing spiro-pyrans that the degree of polymerization is 6 is obtained into pellet with the beads fuse blending of vacuum bag film, then
Directly extrusion is obtained vacuum bag monofilm to the pellet that melt blending is obtained, and the polymer uniform containing spiro-pyrans is dispersed in vacuum bag
In monofilm, the content of the polymer containing spiro-pyrans is 2.9wt% in monofilm, and the polymer color for containing spiro-pyrans starts hair
It is 0.08MPa that changing needs the pressure for applying, and the structural formula that this contains the polymer of spiro-pyrans is as follows：
(2) pressure differential that the method by vacuumizing adjusts inside and outside vacuum bag film is 0.08MPa, observes vacuum bag film
Whether have color change, air tight position should be changed into aubergine from light yellow, Gas leak position due to being connected with opposite side, pressure
Smaller, color is still in faint yellow, that is, the point as air leakage point that the color observed does not change.
Embodiment 7
A kind of method that utilization pressure-sensitive material detects vacuum bag film air leakage point, its step is as follows：
(1) polymer containing spiro-pyrans that the degree of polymerization is 10 is obtained into pellet with the beads fuse blending of vacuum bag film, so
Melt blending is obtained pellet afterwards is three-layer co-extruded with the pellet of vacuum bag film to be gone out to be combined prepared vacuum bag trilamellar membrane, containing spiro-pyrans
Polymer uniform be dispersed in the intermediate layer of vacuum bag film, in intermediate layer containing spiro-pyrans polymer content be 4.9wt%,
It is 0.06MPa that change takes place to need the pressure for applying for the polymer color containing spiro-pyrans, and this contains the polymer of spiro-pyrans
Structural formula it is as follows：
(2) pressure differential for being adjusted inside and outside vacuum bag film by being pressed into the method for gas is 0.12MPa, observes vacuum bag
Whether film has color change, and air tight position should be changed into aubergine from light yellow, and Gas leak position is pressed due to being connected with opposite side
Power is smaller, and color is still in faint yellow, that is, the point as air leakage point that the color observed does not change.
Embodiment 8
A kind of method that utilization pressure-sensitive material detects vacuum bag film air leakage point, its step is as follows：
(1) polymer containing spiro-pyrans that the degree of polymerization is 5 is obtained into pellet with the beads fuse blending of vacuum bag film, then
The pellet that melt blending is obtained is three-layer co-extruded with the pellet of vacuum bag film to be gone out to be combined prepared vacuum bag trilamellar membrane, containing spiro-pyrans
Polymer uniform is dispersed in the upper epidermis and layer of vacuum bag film, the polymer containing spiro-pyrans in upper epidermis and layer
Content is all 3wt%, and the pressure that the polymer color for containing spiro-pyrans takes place change needs applying is 0.08MPa, and this contains
The structural formula of the polymer of spiro-pyrans is as follows：
(2) pressure differential for being adjusted inside and outside vacuum bag film by being pressed into the method for gas is 0.12MPa, observes vacuum bag
Whether film has color change, and air tight position should be changed into aubergine from light yellow, and Gas leak position is pressed due to being connected with opposite side
Power is smaller, and color is still in faint yellow, that is, the point as air leakage point that the color observed does not change.
Embodiment 9
A kind of method that utilization pressure-sensitive material detects vacuum bag film air leakage point, its step is as follows：
(1) polymer containing spiro-pyrans that the degree of polymerization is 13 is obtained into pellet with the beads fuse blending of vacuum bag film, so
Melt blending is obtained pellet afterwards goes out to be combined the prepared tunic of vacuum bag five with the pellet five-layer co-squeezing of vacuum bag film, containing spiro-pyrans
Polymer uniform be dispersed in the third layer of vacuum bag film, in third layer containing spiro-pyrans polymer content be 3.2wt%,
It is 0.07MPa that change takes place to need the pressure for applying for the polymer color containing spiro-pyrans, and this contains the polymer of spiro-pyrans
Structural formula it is as follows：
(2) pressure differential that the method by vacuumizing adjusts inside and outside vacuum bag film is 0.08MPa, observes vacuum bag film
Whether have color change, air tight position should be changed into aubergine from light yellow, Gas leak position due to being connected with opposite side, pressure
Smaller, color is still in faint yellow, that is, the point as air leakage point that the color observed does not change.
Embodiment 10
A kind of method that utilization pressure-sensitive material detects vacuum bag film air leakage point, its step is as follows：
(1) polymer containing spiro-pyrans that the degree of polymerization is 6 is obtained into pellet with the beads fuse blending of vacuum bag film, then
Four layers of the pellet of the pellet vacuum bag film that melt blending is obtained is coextruded the compound prepared tunic of vacuum bag four, poly- containing spiro-pyrans
Compound is dispersed in the upper epidermis of vacuum bag film and time upper epidermis, the polymer containing spiro-pyrans in upper epidermis and time upper epidermis
Content be all 1wt%, the polymer color for containing spiro-pyrans takes place pressure that change needs apply for 0.09MPa, is somebody's turn to do
The structural formula of the polymer containing spiro-pyrans is as follows：
(2) pressure differential for being adjusted inside and outside vacuum bag film by being pressed into the method for gas is 0.1MPa, observes vacuum bag
Whether film has color change, and air tight position should be changed into aubergine from light yellow, and Gas leak position is pressed due to being connected with opposite side
Power is smaller, and color is still in faint yellow, that is, the point as air leakage point that the color observed does not change.
Claims (10)
1. a kind of method that utilization pressure-sensitive material detects vacuum bag film air leakage point, it is characterized in that：By pressure-sensitive thing
Matter is added in vacuum bag film, is then adjusted the pressure differential inside and outside vacuum bag film and is more than or equal to critical pressure, it was observed that
The point as air leakage point that color does not change；
The critical pressure is the pressure for instigating pressure-sensitive material that color change takes place, and the color change is in naked eyes
In visible range.
2. the method that a kind of utilization pressure-sensitive material according to claim 1 detects vacuum bag film air leakage point, it is special
Levy and be, the vacuum bag film is monofilm or multilayer film, and wherein multilayer film is the film of the number of plies >=2.
3. the method that a kind of utilization pressure-sensitive material according to claim 2 detects vacuum bag film air leakage point, it is special
Levy and be, the pressure-sensitive material is dispersed in any in one or more layers of vacuum bag film.
4. the method that a kind of utilization pressure-sensitive material according to claim 3 detects vacuum bag film air leakage point, it is special
Levy and be, the content of pressure-sensitive material is 0.1~5wt% in the film layer containing pressure-sensitive material.
5. a kind of utilization pressure-sensitive material according to any one of Claims 1 to 4 detects vacuum bag film air leakage point
Method, it is characterised in that be by the method that pressure-sensitive material is added in vacuum bag film：By pressure-sensitive material with it is true
Empty bag film beads fuse blending obtain pellet, the pellet for then obtaining melt blending directly extrusion or with vacuum bag film
Pellet is multi-layer co-extruded compound.
6. the method that a kind of utilization pressure-sensitive material according to claim 1 detects vacuum bag film air leakage point, it is special
Levy and be, the pressure differential inside and outside the regulation vacuum bag film uses the method for vacuumizing or being pressed into gas.
7. the method that a kind of utilization pressure-sensitive material according to claim 1 detects vacuum bag film air leakage point, it is special
Levy and be, the critical pressure is 0.06~0.1MPa.
8. the method that a kind of utilization pressure-sensitive material according to claim 1 detects vacuum bag film air leakage point, it is special
Levy and be, the pressure-sensitive material is the polymer containing spiro-pyrans.
9. the method that a kind of utilization pressure-sensitive material according to claim 8 detects vacuum bag film air leakage point, it is special
Levy and be, the structural formula of the polymer containing spiro-pyrans is as follows：
In formula, n represents the degree of polymerization of the polymer containing spiro-pyrans, n >=5.
10. the method that a kind of utilization pressure-sensitive material according to claim 9 detects vacuum bag film air leakage point, it is special
Levy and be, the color change refers to be changed into aubergine from light yellow.
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| CN113670542A (en) * | 2021-09-18 | 2021-11-19 | 山东双一科技股份有限公司 | Method for detecting air leakage point position of vacuum bag of blade mould and system applied by method |
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| CN113670542A (en) * | 2021-09-18 | 2021-11-19 | 山东双一科技股份有限公司 | Method for detecting air leakage point position of vacuum bag of blade mould and system applied by method |
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