CN115782261A - Method for judging and repairing air leakage position of surface defect of composite material sealed box body - Google Patents
Method for judging and repairing air leakage position of surface defect of composite material sealed box body Download PDFInfo
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Abstract
The invention relates to a method for judging and repairing the air leakage position of a defect on the surface layer of a composite material sealing box body, which is used for solving the quality problems of layering, air bubbles, dry spots and the like of a product caused by the fact that a resin is infiltrated into an unsaturated state in the process of introducing resin in a vacuum assisted forming process (VARI) adopted by a composite material packaging box. The method is suitable for a glass fiber/epoxy vinyl composite material packing box, and specifically comprises the following steps: the method comprises the following steps: positioning a gas leakage source; step two: analyzing a gas leakage mechanism; step three: polishing and cleaning a repairing area; step four: drilling a blind hole; step five: blending resin; step six: injecting resin; step seven: glass fiber infiltration and paving; step eight: curing treatment; step nine: polishing; step ten: smearing putty; step eleven: painting treatment; step twelve: and (6) checking. The repairing method is convenient to operate, has obvious effects, achieves cost reduction and efficiency improvement, and is suitable for popularization and application of repairing processes similar to composite material normal-temperature curing modes.
Description
Technical Field
The invention relates to the field of repair of surface defects of a composite material sealing box body, in particular to a method for judging and repairing air leakage positions of surface defects of a glass fiber/epoxy vinyl composite material packaging box.
Background
The glass fiber reinforced composite material has the excellent performances of high strength, large specific stiffness, corrosion resistance and the like, is developed in the early 60 th century in China, and gradually relates to the fields of aerospace, aviation, ships, ground weaponry, civil equipment and the like.
In recent years, a large glass fiber/epoxy vinyl composite material sealed box body for storing and transporting certain aircraft products adopts a VARI process, and low-cost and high-yield manufacturing is realized from the process and equipment. Aiming at the product forming process, the forming process adopts resin to soak dry glass fiber layers and sandwich material structures, if the resin is not uniformly saturated in the introducing process, local dry spots exist in the cured interior, and the internal quality of the product after curing is directly influenced. The main raw material of the vinyl epoxy resin is thermosetting resin, and experiments prove that the resin has good viscous flow special effect and low price, and is suitable for low-cost manufacture. But the curing shrinkage of the resin is 9.56 percent, and a dry spot quadrant is easy to generate after curing; the elongation at break of the resin casting body is 1.94%, the toughness is poor, and when the impact magnitude is large, the risk of surface layer cracking is easy to occur. By combining the characteristics of the resin, the technical research on quality problem repair needs to be carried out in a targeted manner.
In a repairing method for a structure-function integrated composite product provided in patent document with publication number CN114055814A in the prior art, an imaging detection module and a laser detection module are used to detect a standard product, so as to obtain a preliminary defect part. Through cleaning operation, punching operation, heating operation and cooling operation, a targeted treatment method is adopted according to the defects of debonding, layering and bulging of the damage type.
In a method for repairing surface bubbles and gel-lacking defects of a resin reinforced fiber composite material, which is proposed in patent document with publication number CN109454905A in the prior art, maintenance work is carried out by respectively adopting process flows of defect position surface treatment, repair area surface cleaning, non-repair area protection, resin blending, defect repair, heating curing, hardness detection, polishing and finishing after curing and the like, so that the reduction of maintenance cost and the reduction of after-sale problems are realized.
In an airtight repair method for a glass fiber composite material launch box, which is proposed in patent document with publication number CN114670473A in the prior art, a gas leakage point is checked through soapy water, a repair area is polished, the surface of a repair material is paved and pasted, internal bubbles are removed through a vacuumizing device, and a repair effect is achieved through a heating and curing method.
The patent CN114055814A adopts high-precision detection equipment for detection, and is not suitable for detecting the defect part of a large-scale composite material box body. The patent CN109454905A only proposes a corresponding repairing method aiming at the defects of surface bubbles and glue shortage, adopts a heating curing process, and does not relate to a method for detecting and repairing the defects of the air leakage problem of a large-scale composite material sealing box body. Patent CN114670473A only repairs the surface area of the air leakage position of the glass fiber composite material box body, and adopts vacuum pumping equipment to perform heating curing repair.
Disclosure of Invention
In order to solve the problem of air leakage caused by internal 'dry spots' and external cracks in a large glass fiber reinforced resin matrix composite material sealing box body structure, the invention adopts an efficient and low-cost air leakage position determination and repair method, has reliable verification effect and is more suitable for repair work of batch products.
The invention relates to a method for judging and repairing the surface defect and air leakage position of a sealed box body, which comprises the following steps:
a method for judging and repairing the surface defect and air leakage position of a composite material sealing box body comprises the following steps:
judging the air leakage positions of the outer surface and the inner surface of the composite material sealing box body through the leakage detection liquid;
polishing and cleaning the air leakage position on the inner surface of the box body;
drilling a plurality of blind holes in a polishing area on the inner surface of the box body, and deeply processing the blind holes to a sandwich material layer of the composite material;
injecting resin into the blind hole to enable the blind hole to be fully soaked in the inner cavity of the air leakage area;
uniformly sticking the glass fiber chopped strand mats to a polishing area on the inner surface of the box body, and sealing and compacting;
curing the injected resin;
smearing atomic ash on the repaired area of the inner surface of the box body and solidifying;
and (4) performing paint spraying treatment on the solidified atomic ash, and finishing repairing after the paint layer is solidified.
Furthermore, the composite material sealing box body is made of glass fiber/epoxy vinyl composite materials or other suitable composite materials.
Further, the method specifically comprises the following steps:
the method comprises the following steps: and positioning a gas leakage source. And (3) filling dry air or nitrogen into the sealed box body to maintain the stable air pressure in the box, wherein the pressure in the box is required to meet the technical index requirements. Preferably, the SWAGELOK brand SNOOP is adopted to detect leakage, the butt joint position of the box body is assembled, the crack positions on the outer surface of the box body are sprayed with proper amount of leakage detection liquid, whether continuous bubbles are generated or not is observed, and the air leakage position is judged. After the air leakage position of the outer surface of the box body is locked, the pressure in the box is unloaded, the box door is opened, the air leakage position of the inner surface of the box body is searched, and two leakage detection methods are provided: (1) Blowing the air leakage crack position on the outer surface of the box body by adopting a handheld high-pressure air gun, spraying a proper amount of leakage detection liquid on the inner surface of the box body in the area near the air leakage position, and searching the air leakage position; (2) Proper amount of water is injected into the large-scale box body to form a local 'water tank area', the crack position of the air leakage on the outer surface of the box body is blown, meanwhile, the bubble generation condition of the 'water tank area' is observed, and the position of the continuous rising bubbles can be judged to be the air leakage source of the inner cavity of the box body. After the air leakage positions of the inner surface and the outer surface of the box body are locked, the air leakage reason is further analyzed, and the repair work is carried out; namely, the inner surface of the box body is repaired and sprayed, and the outer surface of the box body is sprayed.
Step two: and (4) analyzing a gas leakage mechanism. The internal quality of the product cannot be judged by adopting conventional ultrasonic nondestructive testing equipment from the aspects of cost and structural size of the large box body; preferably, a trian woodpecker knock detector is used to detect the internal quality of the air leak location. The glass fiber/epoxy vinyl composite material sealed box body is structurally characterized in that a paint layer, a glass fiber outer skin, a sandwich material, a glass fiber inner skin and a hand-pasted glass fiber chopped strand mat are adopted, the sandwich layer influences flowing and soaking of resin, and if the time and the flow rate of the resin in the introduction process are not controlled in place, the phenomena of air holes, dry spots and the like are generated in the product after curing. The product is cured at normal temperature, the temperature difference of the placing environment is large, the product is frequently expanded with heat and contracted with cold, the toughness of the resin is poor, and the risk of surface layer cracking is easy to occur. Tests prove that the curing process of the resin product is preferably carried out in an oven (60 ℃ and the heat preservation time is 8 hours), and the curing degree can be more than 95%.
Step three: and (5) polishing and cleaning the repaired area. Preferably, a hand-held grinding machine is adopted to grind the air leakage area on the inner surface of the box body; the paint layer is removed from the inner surface of the box body, and the depth of the composite material blank surface (1.5-2) mm is ground off from the inner surface of the box body. After the completion, adopt dust catcher and brush clearance surface dust impurity.
Step four: and (6) drilling a pin in a blind hole. Drilling a plurality of blind holes (preferably 5-10 blind holes) by adopting a hand-held drill gun (an electric drill or a pneumatic air gun drill) in a grinding area, and deeply processing the blind holes to a sandwich material layer with the aperture phi (2-3) mm; for resin injection and ejection.
Step five: and (3) blending the resin. Preferably, the resin matrix of the same type is adopted for blending.
Step six: and (4) injecting resin. Preferably, a medical injector is used for extracting a proper amount of resin, a needle head is inserted into the blind hole, the resin is slowly injected to enable the resin to be fully soaked in the inner cavity of the air leakage area, the injection is finished after the resin overflows through the residual blind holes, and the injection work of the resin is required to be finished before gelation.
Step seven: and (5) infiltrating and coating the glass fiber. Preferably, the glass fiber chopped strand mat is cut into a proper size, is soaked in structural adhesive (HY-914 adhesive), is uniformly adhered to a polishing area, is smooth to adhere, and is tightly bound by a sealing adhesive tape to achieve the sealing and compacting effects.
Step eight: and (5) curing treatment. In order to avoid the influence of the high-temperature process of the box body on the performance, the resin in the repairing area is preferably cured at normal temperature, and the curing time is not less than 24 hours.
Step nine: and (7) polishing. And (3) disassembling the sealing adhesive tape, after the resin in the area to be repaired is completely cured, polishing and polishing the protrusion and the burr area by using a handheld polishing machine, and then requiring the surface of the repaired area to be level, and cleaning surface impurities by using a dust collector and a brush.
Step ten: smearing putty. And (3) smearing a proper amount of putty with atomic ash on the repaired area (namely the glass fiber chopped strand mat) on the inner surface of the box body, and flattening, wherein the thickness of the putty is not more than 0.5mm. After the putty is solidified, blowing off the dust of the putty by using compressed air, and wiping by using dry cloth.
Step eleven: and (7) painting treatment. Preferably, the paint is sprayed using a spray gun (bore. Phi. 3.0 mm). When spraying operation is carried out, the distance between the spray gun and the surface of the mold is controlled to be about 0.5m, and the atomization degree of the spray gun is ensured; the paint layer is uniform and in place, can not be sprayed in a leakage way or is locally too thin and too thick, has no phenomena of sagging, orange-peel wrinkles and the like, and the spraying thickness is controlled to be (0.5-0.8) mm. Preferably, the spray application procedure is primer (2 passes) + topcoat (2 passes). Firstly, spraying a primer: the special primer for the glass fiber reinforced plastic is adopted, the spraying is carried out for 2 times, the thickness of each time is controlled to be (35 +/-5) mu m, and the spraying interval is more than 20min. Secondly, after the primer is cured, spraying finish paint: and (3) spraying finish paint with corresponding specifications for 2 times according to requirements, wherein the thickness of each time is controlled to be (0.5-0.8) mm. If flow marks, hairiness and particles are found in the spraying process, polishing and cleaning the coating by using water sand paper after the surface of the coating is dried; if large-area bottom biting occurs, the original coating is immediately cleaned, and the paint is sprayed after the edge is polished.
Step twelve: and finishing the repairing work after the paint layer is solidified.
The invention has the following beneficial effects:
aiming at the problem of air leakage of a large composite material sealed box body, the invention mainly highlights that the internal defect filling of the composite material skin is realized by adopting a resin injection mode, and meanwhile, the surface is coated by glass fiber infiltration.
The method for judging and repairing the air leakage position of the defect on the surface layer of the composite material sealing box body is convenient to operate, has obvious effect, can realize cost reduction and efficiency improvement, and is suitable for popularization and application of a repairing process similar to a composite material normal-temperature curing mode.
Drawings
FIG. 1 is a flow chart of the determination and repair of the leakage position of the box body according to the present invention.
FIG. 2 is a schematic view of a glass fiber/epoxy vinyl composite sealed box structure according to the present invention.
FIG. 3 is a schematic view of the repair of the leakage position of the tank in the present invention. Wherein: 1-a composite skin layer; 2-polishing glass fiber paving in the subsidence area; 3-spreading glass fiber on the surface of the polishing area; 4-sealing tape pasting; 5-resin injection.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention provides a leakage detection and repair method for a large glass fiber reinforced resin matrix composite sealing box, the flow of the method is shown in figure 1, and the adopted repair idea is as follows: the box body is pressed, leakage points on the outer surface of the box body are found out by adopting leakage detection liquid, the box door is decompressed, compressed gas is blown to the leakage points on the outer surface, the leakage position of the inner surface of the box body is detected, then only the inner surface is repaired and the leakage is repaired, and the outer surface is not treated. The method specifically comprises the following steps:
the method comprises the following steps: and positioning a gas leakage source. According to the design requirement, dry air is filled in the sealed box body, and the air pressure is stable at 15KPa. Preferably, the SWAGELOK brand SNOOP leakage detection liquid is adopted to spray a proper amount of liquid on the outer surface of the box body, and the air leakage position on the outer surface of the box body is judged by observing the condition of air bubbles. After the box body is locked at the air leakage position on the outer surface of the box body, the pressure in the box body is removed, the box door is opened, and the air leakage position on the inner surface of the box body is searched. And blowing the air leakage position of the outer surface of the box body by adopting a handheld high-pressure air gun, spraying a proper amount of leakage detection liquid on the inner surface of the box body in the area near the air leakage position, and determining the air leakage position of the inner surface of the box body according to the condition of bubble generation. And after the air leakage positions of the inner surface and the outer surface of the box body are locked, repairing is carried out.
Step two: and (4) analyzing a gas leakage mechanism. The glass fiber/epoxy vinyl composite material sealed box body structure is characterized in that a paint layer, a glass fiber outer skin (glass fiber/epoxy vinyl composite material), a sandwich material, a glass fiber inner skin (glass fiber/epoxy vinyl composite material), a hand-pasted glass fiber chopped strand mat are arranged, the sandwich layer influences the flowing and soaking of resin, and if the time and the flow rate of the resin in the introducing process are not controlled in place, the phenomena of air holes, dry spots and the like in the product can be caused after the resin is cured, and the reference is made to fig. 2. The product is cured at normal temperature, the temperature difference of the placing environment is large, the product is frequently expanded with heat and contracted with cold, the toughness of the resin is poor, and the risk of surface layer cracking is easy to occur. Tests prove that the curing process of the resin product is preferably carried out in an oven (60 ℃ and the heat preservation time is 8 hours), and the curing degree can be more than 95%. In this embodiment, the three-well woodpecker knock detector is used to detect the internal quality of the air leakage position. And (4) repairing the defect of the air leakage problem by adopting a resin injection method.
Step three: and (5) polishing and cleaning the repaired area. Preferably, a hand-held grinding machine is adopted to grind the air leakage area on the inner surface of the box body; the paint layer is removed from the inner surface of the box body, and the depth of the composite material blank surface (1.5-2.0) mm is ground off from the inner surface of the box body. After the completion, adopt dust catcher and brush clearance surface dust impurity.
Step four: and drilling a pin in the blind hole. And (3) drilling 6 blind holes with the diameter of 3mm by adopting a handheld drilling gun in the grinding area.
Step five: blending resin. The mixture ratio parameter of the vinyl epoxy resin (SWANCOR 901-200) in the normal temperature environment is 15-30 ℃: curing agent (V388): accelerator (swanor 1305) =100:2:0.8; firstly, placing vinyl epoxy resin in a clean container, secondly, slowly placing a curing agent, uniformly stirring for 1min, then placing an accelerant, and simultaneously, continuously stirring for 1 min. The service time of the resin matrix is required to be not more than 15min.
Step six: and (4) injecting resin. Extracting a proper amount of resin by using a medical injector, inserting a needle into the blind hole, slowly injecting the resin to fully soak the resin in an inner cavity of an air leakage area, and ending injection after the resin overflows from the rest blind holes to require the resin to finish injection before gelation; see fig. 3.
Step seven: and (5) infiltrating and coating the glass fiber. Cutting a glass fiber chopped strand mat into a proper size, soaking the glass fiber chopped strand mat with structural adhesive (HY-914 adhesive), uniformly sticking the soaked chopped strand mat to a polished area, flattening the sticking, and tightly binding by using a sealing adhesive tape.
Step eight: and (5) curing treatment. And (3) curing at normal temperature for 24 hours.
Step nine: and (7) polishing. And (3) disassembling the sealing adhesive tape, after the resin in the region to be repaired is completely cured, polishing and polishing the protrusion and the burr region by using a handheld polishing machine, and then requiring the surface of the region to be repaired to be level, and cleaning impurities on the surface by using a dust collector and a brush.
Step ten: and (5) smearing putty. And (3) coating a proper amount of putty with the thickness not more than 0.5mm on the repaired area of the inner surface of the box body, namely the glass fiber chopped strand mat, and flattening. After the putty is solidified, blowing off the dust of the putty by using compressed air, and wiping by using dry cloth.
Step eleven: and (5) spray painting treatment. The paint is sprayed by a spray gun (the caliber is phi 3.0 mm). The spraying process comprises the steps of (2 times) spraying the primer and (2 times) spraying the finish. Firstly, spraying a primer: the special primer for the glass fiber reinforced plastic is adopted, the spraying is carried out for 2 times, the thickness of each time is controlled to be (35 +/-5) mu m, and the spraying interval is more than 20min. Secondly, after the primer is cured, spraying finish paint: and (3) spraying finish paint of corresponding specifications for 2 times according to requirements, wherein the thickness of each time is controlled to be (0.5-0.8) mm.
Step twelve: and finishing the repair work after the paint layer is solidified.
The particular embodiments of the present invention disclosed above are illustrative only and are not intended to be limiting, since various alternatives, modifications, and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The invention should not be limited to the disclosure of the embodiments in the present specification, but the scope of the invention is defined by the appended claims.
Claims (10)
1. A method for judging and repairing the surface defect and air leakage position of a composite material sealed box body is characterized by comprising the following steps:
judging the air leakage positions of the outer surface and the inner surface of the composite material sealing box body through the leakage detection liquid;
polishing and cleaning the air leakage position on the inner surface of the box body;
drilling a plurality of blind holes in a polishing area on the inner surface of the box body, and deeply processing the blind holes to a sandwich material layer of the composite material;
injecting resin into the blind hole to enable the blind hole to be fully soaked in the inner cavity of the air leakage area;
uniformly sticking the glass fiber chopped strand mats to a polishing area on the inner surface of the box body, and sealing and compacting;
curing the injected resin;
smearing atomic ash on the repaired area of the inner surface of the box body and solidifying;
and (4) performing paint spraying treatment on the solidified atomic ash, and finishing repairing after the paint layer is solidified.
2. The method of claim 1, wherein the composite sealed box is made of a glass fiber/epoxy vinyl composite.
3. The method of claim 1, wherein determining the location of a leak in the exterior and interior surfaces of the composite containment tank from the leak detection fluid comprises:
filling dry air into the composite material sealed box body, spraying a proper amount of leakage detection liquid on the outer surface of the box body, and judging the air leakage position of the outer surface of the box body according to the condition of bubble generation;
after the air leakage position of the outer surface of the box body is judged, the pressure in the box body is unloaded, and the air leakage position of the inner surface of the box body is judged by adopting one of the following modes:
blowing the air leakage position on the outer surface of the box body by using a high-pressure air gun, spraying a proper amount of leakage detection liquid on the inner surface of the box body in the area near the air leakage position, and judging the air leakage position on the inner surface of the box body according to the condition of bubble generation;
and injecting a proper amount of water into the box body to form a local water tank area, blowing the air leakage position on the outer surface of the box body, observing the generation condition of bubbles in the water tank area, and judging the position where the bubbles continuously rise to be the air leakage position on the inner surface of the box body.
4. The method of claim 1, wherein the polishing and cleaning of the leak location on the interior surface of the tank comprises:
and (3) polishing the air leakage area on the inner surface of the box body by using a handheld polisher, removing a paint layer on the inner surface of the box body, polishing to remove the depth of 1.5-2.0 mm of the surface of the composite material blank, and cleaning dust impurities on the surface by using a dust collector and a brush after finishing.
5. The method as claimed in claim 1, wherein the grinding area of the inner surface of the box body is drilled with a plurality of blind holes, the number of the blind holes is 5-10, and the hole diameter is 2-3 mm.
6. The method of claim 1, wherein injecting resin into the blind hole comprises: and (3) extracting a proper amount of resin by using a medical injector, inserting a needle into the blind hole, slowly injecting the resin to fully soak the resin in the inner cavity of the air leakage area, and ending injection after the resin overflows from the rest blind hole to require the resin to finish injection before gelation.
7. The method of claim 1, wherein the uniformly adhering the glass chopped strand mat to the grinding area and the sealing and compacting comprise: cutting a glass fiber chopped strand mat into a proper size, impregnating the glass fiber chopped strand mat with structural adhesive, uniformly sticking the impregnated glass fiber chopped strand mat to a polishing area, smoothly sticking the glass fiber chopped strand mat to the polishing area, and tightly binding the glass fiber chopped strand mat with a sealing adhesive tape; and after the resin is completely cured, disassembling the sealing adhesive tape, polishing and polishing the protrusion and burr areas by using a handheld polishing machine to enable the surfaces of the repaired areas to be flush, and cleaning impurities on the surfaces by using a dust collector and a brush.
8. The method according to claim 1, wherein the curing treatment of the injected resin is a normal temperature curing treatment, and the curing time is not less than 24 hours.
9. The method of claim 1, wherein the atomic ash has a thickness of no greater than 0.5mm; after the putty is solidified, the dust of the putty is blown out by compressed air and wiped by a dry cloth.
10. The method of claim 1, wherein the paint spraying process comprises a primer and a topcoat, and the step of spraying comprises: spraying the special primer for the glass fiber reinforced plastics for 2 times, wherein the thickness of each time is controlled to be 35 +/-5 mu m, and the spraying interval is more than 20min; and (3) after the primer is cured, spraying finish for 2 times, wherein the thickness of each time is controlled to be 0.5-0.8 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211312585.1A CN115782261A (en) | 2022-10-25 | 2022-10-25 | Method for judging and repairing air leakage position of surface defect of composite material sealed box body |
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| CN1429725A (en) * | 2001-12-30 | 2003-07-16 | 聂保廷 | Repairing method of automobile non-metal parts |
| JP2009208351A (en) * | 2008-03-04 | 2009-09-17 | Toyota Motor Corp | Repairing method of composite material, and manufacturing method of the composite material |
| CN106891555A (en) * | 2017-03-03 | 2017-06-27 | 马琳 | Using the method for ultrasonic heat in-situ repair thermoplastic composite defect |
| CN110962377A (en) * | 2018-09-28 | 2020-04-07 | 成都飞机工业（集团）有限责任公司 | Honeycomb sandwich structure part repairing method capable of reducing structure loss |
| KR102379213B1 (en) * | 2021-05-28 | 2022-03-28 | 비제이엠텍 주식회사 | A crack repair method that automatically controls the pressure of the injection device and at the same time injects high-quality crack repair agent and injects an appropriate amount of crack repair agent according to the crack specification to prevent damage to the structure |
| CN114670473A (en) * | 2022-03-24 | 2022-06-28 | 江苏新扬新材料股份有限公司 | Airtight repairing method for glass fiber composite material launching box |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1429725A (en) * | 2001-12-30 | 2003-07-16 | 聂保廷 | Repairing method of automobile non-metal parts |
| JP2009208351A (en) * | 2008-03-04 | 2009-09-17 | Toyota Motor Corp | Repairing method of composite material, and manufacturing method of the composite material |
| CN106891555A (en) * | 2017-03-03 | 2017-06-27 | 马琳 | Using the method for ultrasonic heat in-situ repair thermoplastic composite defect |
| CN110962377A (en) * | 2018-09-28 | 2020-04-07 | 成都飞机工业（集团）有限责任公司 | Honeycomb sandwich structure part repairing method capable of reducing structure loss |
| KR102379213B1 (en) * | 2021-05-28 | 2022-03-28 | 비제이엠텍 주식회사 | A crack repair method that automatically controls the pressure of the injection device and at the same time injects high-quality crack repair agent and injects an appropriate amount of crack repair agent according to the crack specification to prevent damage to the structure |
| CN114670473A (en) * | 2022-03-24 | 2022-06-28 | 江苏新扬新材料股份有限公司 | Airtight repairing method for glass fiber composite material launching box |
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