CN106393741B - A kind of coating process of the thin stick of composite material toughening - Google Patents
A kind of coating process of the thin stick of composite material toughening Download PDFInfo
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- CN106393741B CN106393741B CN201610917353.7A CN201610917353A CN106393741B CN 106393741 B CN106393741 B CN 106393741B CN 201610917353 A CN201610917353 A CN 201610917353A CN 106393741 B CN106393741 B CN 106393741B
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- thin stick
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/521—Pultrusion, i.e. forming and compressing by continuously pulling through a die and impregnating the reinforcement before the die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/525—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/525—Component parts, details or accessories; Auxiliary operations
- B29C70/528—Heating or cooling
Abstract
Coating process of the present invention about a kind of thin stick of composite material toughening, belongs to composite material surface technical field of modification.The coating process includes the following steps：First, the fibre bundle for infiltrating resin passes through aperture pre-profiling mold, forms circular cross sectional shape；It then passes through the internal coating chamber for having carbon fiber powder coating；Third, by the dust exhaust apparatus being not directly contacted with, surface bonds unstable carbon fiber powder and will be removed thin stick；4th, thin stick carries out preheating and gel by preheating device and heating device；5th, thin stick shapes by shaper；6th, thin stick is cured by heating device；Finally, thin stick passes through the dust catcher with fine, soft fur brush and again removes the thin stick surface unstable fiber powder of bonding.The coating process of the present invention can realize that, using fiber powder as coating, using the coated composite material adhesive property of itself, no chemical residues, without individual coating procedure, method is simple, efficient in thin stick production process.
Description
Technical field
The present invention relates to the process for modifying surface of composite material, the coating skill of specially a kind of thin stick of composite material toughening
Art, the coating technology are mainly used for improving interface performance between the thin stick of composite material toughening and laminate.
Background technology
Conventional two-dimensional laminated composite has mechanical performance in good face, but does not have fiber reinforcement between its each layer,
Only play a part of bonding and transmitting load, therefore the performance phase between laying direction and laying by matrix resin
To weaker.When being acted on by external load, which often generates interlaminar failure, while composite layer first
Between the relatively low damage-resistant for also resulting in composite material of intensity can be poor.In order to improve these disadvantages of laminated composite, go out
Many technologies for improving composite laminated toughness are showed.Thin stick toughening technology is cured in the thickness direction insertion of prepreg
The thin stick of composite material, to be provided overseas Chinese federation's power of thickness direction by toughening material.In this method due to cost it is relatively low, to material
Performance influences smaller in face, and toughening effect is preferable, by the extensive concern of academia and industrial quarters.
The transmission of load is realized by interface between the thin stick of toughening and laminate.And scientific research is used and industrial toughening is thin
Stick is the more smooth cylindrical structure in surface, if being modified to thin stick surface to improve the interface between thin stick and laminate
Performance can then further increase toughening effect of the thin stick to laminate.Composite material surface modification technology has very much, including object
Manage coarse modification, chemical etching, coating etc..However, the general 1.0mm of diameter of section of the thin stick of composite material toughening hereinafter, for
The composite product of this fineness, the coarse modification of traditional physics are easy to cause to damage to material, there is hardly possible in Project Realization
Degree.Since the resin of the thin stick of toughening is usually epoxy resin or bimaleimide resin, have after both resin solidifications excellent
Good corrosion resistance, according to the method for chemical etching, effect is not obvious.Traditional coating technology is after hardening compound
Material surface coating reagent, for playing the role of decoration or protection.The thin stick of toughening is carried out according to the method for conventional coatings
It is modified, it is difficult to a kind of reagent is found, it can be bonding with the thin stick surface after solidification but also bonding with uncured laminate.
Therefore, traditional coating process is not suitable for the modification to the thin stick of composite material.
Invention content
In view of the deficiencies of the prior art, the technical issues of present invention intends to solve is to propose a kind of thin stick of composite material toughening
Coating process, the coating process are different from existing coating process.Conventional composite materials coating process has been consolidated by material
After chemical conversion type, pass through individual coating procedure in material surface, material surface is coated on using the coating of liquid, and the present invention applies
Layer method is realized during material is molding, and without individual coating procedure, coating uses dry fibers powder powder, do not adopt
With chemical reagent, using the coated composite material adhesive property of itself, preceding dry fibers powder thin stick is attached on self-curing
Surface.
The present invention intends to solve that the technical solution of the coating process technical problem is to design a kind of thin stick of composite material toughening
Coating process, which includes the following steps：
First, the fibre bundle for infiltrating resin passes through aperture pre-profiling mold, forms circular cross sectional shape (pre-profiling mold
Die cavity diameter should meet fibre bundle in prismatic die cavity fiber volume fraction between 30% to 70%；
It then passes through the internal storeroom (abbreviation coating chamber) for having carbon fiber powder coating, coating chamber is tubular housing knot
Structure, axis has hole to coating chamber along its length, and thin stick passes through from coating chamber hole, and coating chamber inner cavity is by 3 to 10 sides
Equilateral polygon panel splicing forms, and the length of side on each side is more than 10mm, between cavity length is 0.05 to 0.5 meter, coating chamber
Each panel is conductive material, can connect electrostatic field and ground connection, conduction does not occur between two adjacent panels, when thin stick
During by coating chamber, each moment, there are one panels to connect electrostatic field, and remaining panel is grounded, every 0.5 to 5 second,
Electrostatic field switching be connected to last moment connection panel it is opposite or tiltedly to face, lap ground connection, then coating will be from last moment
Connect the face movement towards connection electrostatic field at this time of electrostatic field.Continuous cyclic switching electrostatic field and the terminal of ground connection, coating is not
The disconnected face for being adsorbed to electrostatic field connection, coating will discount movement in coating chamber around the center where thin stick.Its
Middle electrostatic field voltage control is in 0.5-10kv；
Third, thin stick pass through the dust exhaust apparatus being not directly contacted with immediately after being passed through from coating chamber, surface bonds unstable
Carbon fiber powder will be removed.
4th, thin stick carries out preheating and gel by preheating device and heating device.
5th, thin stick shapes by shaper, and the cross-section through-hole diameter of shaping mould is than pre-profiling mold
Big 0.05mm to 1mm；
6th, thin stick is cured by heating device, makes consolidating for thin stick by temperature and the control of the length of heating device
Change degree should reach 70% or more.
Finally, thin stick passes through the dust catcher with fine, soft fur brush and again removes the thin stick surface unstable fiber powder of bonding.
Coating process of the present invention be the thin stick of existing composite material toughening forming technique (applicant
An other patent of invention：A kind of forming method and device of the thin stick of composite material toughening, the patent No.：201210204757.3)
On the basis of implement, coating process of the present invention can realize on the basis of the patent of invention described device.
Coating of the present invention is fiber powder, can be the high performance fibers such as carbon fiber, glass fibre, quartz fibre
Powder, fiber powder fineness are chopped strand, fiber powder or the carbon nanotube etc. less than 1mm, if fiber powder dress object fineness is too big,
It is then not easy to be attached to z-pin and shows to cause the thin stick diameter after coating uneven, appearance is irregular.
The size of pre-profiling mould diameter should meet fibre bundle in the die cavity of cross-section through-hole volume content be 30% to
70%, diameter i.e. cannot too slightly can not be too thin.If diameter is too thick, the volume content of the thin stick of fibre bundle is excessively high, then infiltrates tree
The fibre bundle of fat is unable to the circular cross-section of formation rule after pre-profiling mold, causes to be molded bad；If diameter is too thin,
The resin content of the thin stick of fibre bundle is too low, and coating is not easy to be bonded in the surface of thin stick.
When thin stick by coating chamber during, electrostatic field and ground wire constantly switch connected panel position,
Each moment, there are one panels to connect electrostatic field, remaining panel ground connection.The time that electrostatic field is connected in each panel be it is identical,
Between 0.5 to 5 second.It is a cycle that each panel, which is all connected with electrostatic field once, the end of continuous cyclic switching electrostatic field and ground connection
Son, coating are constantly adsorbed to the panel of electrostatic field connection, constantly switch electrostatic field to it is opposite or tiltedly to panel, then coating exist
Coating chamber will discount movement around the center where thin stick.Since thin stick surface resin has adhesion, if applying
Material is in contact with it during movement, will be attached on thin stick surface.
Thin stick is in coating chamber, since resin is uncured and coating chamber has certain heating function, and coating chamber room
Interior temperature ensures that resin has lower viscosity, and therefore, thin stick surface resin has preferable adhesion, mistake of the coating in movement
The thin stick contacts of Cheng Zhongyu, then be glued to thin stick surface.
Coating chamber can be single independent coating chamber, also can arrange coating chamber along thin stick path direction, be divided into several
Small coating chamber is combined and spliced to be formed, and can make the coating powder on thin stick length direction is more uniform to be coated in thin stick surface in this way.
The connection of each face connection electrostatic field of coating chamber and ground connection is switched to the prior art, can automatically be controlled by programmable controller etc.
Instrument processed or equipment are realized.
There is axis coating chamber hole, thin stick to be passed through from coating chamber hole, need to adjust thin stick drawing side along its length
To, so that thin stick is not contacted with hole side or wall, this is because it is uncured across the thin stick of coating chamber at this time, if contacting meeting with equipment
Thin stick is caused to deform.Since coating chamber needs trepanning, to prevent coating from overflowing pollution environment from coating chamber, coating cell structure is set
Meter is considered as anti-coating overflow-resisting function, and anti-coating overflowing structure design method is the prior art.
The voltage of coating chamber connection electrostatic field should control between 0.5-10kv.If voltage is too big too big, intermediate to pass through
The thin stick of movement will be attracted by electrostatic field, if power supply pressure is too small, cannot preferably attract fiber powder coating.Electrostatic
Field occurrence should be determined according to the fineness of specific coating and the fineness of thin stick.
Since thin stick is after coating, fineness is thicker, and shaper diameter should bigger than pre-profiling mold 0.05 to 1.0mm.
It is to remove to bond unstable coating in time why to pass twice through dust catcher, reduces coating disperse as far as possible,
It prevents from polluting the environment.For the first time by dust catcher, the unstable coating of bonding is cleaned, dust catcher mouth end cannot
It is in direct contact thin stick, in order to avoid uncured thin stick deforms, the hairbrush of second of dust catcher is in direct contact thin stick surface coating,
Thin stick has been cured, and thin stick curing degree has reached 70%, is not susceptible to deform, and can further remove the coating being mingled in this way
It removes.Since thin stick is pulled out from solidification pipeline, there is higher residual temperature, the hairbrush of dust catcher is needed to use heat safe material.
There are following innovative points for patent the method for the present invention：First, coating use fiber powder, make thin stick with it is laminated
Between material in the case of no chemical residues, there is good interface performance；Second, coating step is real before thin stick cures
It applies, the intrinsic adhesive property of resin is utilized, method is simple, and thin stick will not be caused to deform；Third has dexterously used electrostatic
The effect of field, makes to contact with thin stick without other solid matters in addition to coating, and electrostatic force makes coating have certain momentum, provides
The pressure bonded with thin stick.
Compared with prior art, the coating process of the thin stick of composite material toughening of the present invention can be real in thin stick production process
Existing, without individual coating procedure, method is simple, efficient, and fiber powder is only attached on thin stick surface, and no chemistry is residual
It stays, after thin stick is implanted to laminate, a dry fibers part sticks at the resin on the thin stick surface of toughening, and another part is by the tree with laminate
Lipid phase is viscous, the area of load transmission between thin stick and laminate is improved compared with conventional coating techniques, and then be greatly improved
The carefully interface performance between stick and laminate, improves the toughening efficiency of thin stick.
Description of the drawings
Fig. 1 is the coating process flow diagram of the thin stick of composite material toughening of the embodiment of the present invention.
Fig. 2 is pre-profiling mold sections structural schematic diagram of the embodiment of the present invention.
Fig. 3 is coating chamber length direction cross section structure schematic diagram of the embodiment of the present invention.
Fig. 4 is coating chamber cross-sectional structure schematic diagram of the embodiment of the present invention.
Fig. 5 is coating movement locus schematic diagram of the embodiment of the present invention.
Fig. 6 is shaper cross section structure schematic diagram of the embodiment of the present invention.
Specific implementation mode
It is further discussed below the present invention with reference to embodiment and its attached drawing：
It is given below and a diameter of 0.55mm, the coating of 400 mesh carbon fiber powders is prepared using coating process of the present invention
The coating procedure of thin stick：
Thin stick coating procedure, as shown in Figure 1.A branch of T300-3k carbon fibers, which enter in resin storage tank 2, infiltrates resin, with laggard
Enter pre-profiling mold 3, pre-profiling mold 3, as shown in Fig. 2, being 7mm with length, the cross-section circle of a diameter of 0.50mm is logical
Hole die cavity 301.
Thin stick 10 enters after being drawn out from mold 3 in the coating chamber 4 for filling 400 mesh carbon fiber powders immediately, in coating chamber 4 not
The total kilometres (cavity length) for curing thin stick are 300mm, and the drawing speed of thin stick 10 is 1m/min.4 length direction of coating chamber is logical
It crosses partition to divide coating chamber 4 for three cavitys, as shown in figure 3, each cavity length 100mm.When coating is perfused, each cavity edge
Sprue 401 is put into g coating, and partition will limit the coating upper excessive displacement along its length of each cavity, make coating edge
Length direction is more uniform separated, is uniformly tied with heating tape 403 and insulating layer 404 on the outside of coating chamber, 4 internal temperature of coating chamber with
Resin storage tank temperature is 45 DEG C, and resin is made to have lower viscosity.
There is the hole 405 of diameter 10mm, thin stick 10 to be passed through in hole 405 for the center of 4 length direction of entire coating chamber,
Thin stick 10 does not contact during across coating chamber 4 with the wall surface of coating chamber, prevents uncured thin stick 10 from deforming.
There is the cavity 405 that two length are 30mm in the entrance side and outlet side of coating chamber 4, effect is isolation outside coating chamber intracavitary
Excessive coating prevents coating from overflowing pollution environment.The partition panel and end casing of coating chamber length direction are nonconducting polychlorostyrene
Vinyl plate.
Coating chamber 4 is seen as pentagon from cross section, as shown in figure 4, the i.e. inner wall of coating chamber 4 most inner side and coating layer touch
It is engaged by five panels 411.The stitching portion of adjacent two panels panel is the silicon rubber bar 412 of insulation, between adjacent two pieces of panels
Conduction does not occur.Every panel has a connecting terminal, each terminal that can connect electrostatic field or ground connection.401 position of sprue
It is placed between two pieces of panels 411, at 412 place straight line of insulation strip, can be punched in this way to avoid on panel.Coating chamber panel
The voltage of 411 connection electrostatic fields is 2kv.
Uncured thin stick 10 is by during coating chamber, originally, No. 421 terminals connect electrostatic field, remaining four terminal
Ground connection；After 3 seconds, terminal 423 switches to connection electrostatic field by ground connection, meanwhile, terminal 421 switches to ground connection, i.e., terminal 421,
422, it 424,425 is grounded；After 3 seconds, only terminal 425 connects electrostatic field, remaining ground connection；After 3 seconds, only terminal
422 connection electrostatic fields, remaining ground connection ....According to this rule, 3 seconds connection terminals for exchanging an electrostatic field and ground connection are often crossed,
Only there are one terminals to connect electrostatic field for synchronization, and remaining terminal is grounded.Connect the terminal of electrostatic field along number for 421 →
423 → 425 → 422 → 424 →, every 15 seconds cycles, in this way, constantly exchanging the position of electrostatic field, coating 410 will be by
Electrostatic place attracts and constantly changes the panel movement that direction is connected to electrostatic field in coating chamber.Movement locus such as Fig. 5 shows.This
Sample, coating 410 will make broken line movement in coating chamber 4 around center, make around thin stick 10 can with coating contacts, due to thin
10 resin of stick is uncured, and has lower viscosity, and the coating contacted with 10 surface of thin stick will be adhered to 10 surface of thin stick.
Thin stick 10 after coating enters dust suction chamber 5 immediately after being pulled out in coating chamber 4, there is two suctions up and down in dust suction chamber 5
Dirt mouth 501 and 502 removes the unstable coating of bonding, and since thin stick 10 is uncured, dust exhaust apparatus cannot connect with thin stick 10
It touches, to prevent thin stick 10 from deforming.
10 heating pipe 6 of thin stick through coating carries out preheating and gel.
It shapes using shaper 7, it is a diameter of 0.55mm through-holes of cross-section of 2mm that shaper, which has length,
Die cavity 701, as shown in Figure 6.
Thin stick 10 enters back into heating pipe 8 and is cured after sizing, and thin stick 10 uses band fine, soft fur brush after being cured
Dust catcher removed fiber powder loosely is bonded.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than is protected to claim
Protect the limitation of range.Although being described the invention in detail with reference to embodiment, those skilled in the art should manage
Solution, the non-intrinsically safe modification carried out to technical solution of the present invention or equivalent replacement, can not be detached from the reality of technical solution of the present invention
Matter, and should all be within the application scope of the claims.
Claims (2)
1. a kind of coating process of the thin stick of composite material toughening, the coating process include the following steps：
First, the fibre bundle for infiltrating resin passes through aperture pre-profiling mold, forms circular cross sectional shape, the pre-profiling mold
With prismatic round die cavity, and die cavity diameter should meet fibre bundle fiber volume fraction in prismatic die cavity and exist
Between 30% to 70%；
It then passes through the internal storeroom (abbreviation coating chamber) for having carbon fiber powder coating, coating chamber is tubular housing structure, is applied
Axis has hole along its length for floor room, and thin stick passes through from coating chamber hole, and coating chamber inner cavity is equilateral more by 3 to 10 sides
Side shape panel splicing forms, and the length of side on each side is more than 10mm, between cavity length is 0.05 to 0.5 meter, each face of coating chamber
Plate is all made of conductive material, can connect electrostatic field and ground connection, conduction does not occur between two adjacent panels, when thin stick is passing through
During crossing coating chamber, the position of electrostatic field and ground wire constantly the connected panel of switching, each moment, there are one panels
Electrostatic field is connected, remaining panel ground connection, each face connection electrostatic field duration is 0.5 to 5 second, the switching direction of electrostatic field
Be switching be connected to a connection panel it is opposite or tiltedly to panel；
Third, by the dust exhaust apparatus being not directly contacted with, surface bonds unstable carbon fiber powder and will be removed thin stick；
4th, thin stick carries out preheating and gel by preheating device and heating device；
5th, thin stick shapes by shaper, and the shaping mould has cross-section circle die cavity, and die cavity diameter is wanted
It is bigger 0.05mm than pre-profiling mold to 1mm；
6th, thin stick is cured by heating device, makes the curing degree of thin stick that should reach 70% or more；
Finally, thin stick passes through the dust catcher with fine, soft fur brush and again removes the thin stick surface unstable fiber powder of bonding.
2. a kind of as described in claim 1 coating process of the thin stick of composite material toughening is it is characterized in that, the electrostatic field
Control reference voltage is 0.5kv-10kv.
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| CN201610917353.7A CN106393741B (en) | 2016-10-21 | 2016-10-21 | A kind of coating process of the thin stick of composite material toughening |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102729493A (en) * | 2012-06-20 | 2012-10-17 | 天津工业大学 | Molding method and molding apparatus of composite material toughened thin rod |
| CN103381662A (en) * | 2013-06-28 | 2013-11-06 | 句容市百事特复合材料有限公司 | Long and short fiber composite strengthening thermoplastic plastic particle material and production method thereof |
| CN104029401A (en) * | 2014-05-30 | 2014-09-10 | 南京航空航天大学 | Method for preparing phenolic resin system Z-pin by using twisted carbon fibers |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS523659A (en) * | 1975-06-24 | 1977-01-12 | Satsuki Kitani | Process for producing synthetic wood |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102729493A (en) * | 2012-06-20 | 2012-10-17 | 天津工业大学 | Molding method and molding apparatus of composite material toughened thin rod |
| CN103381662A (en) * | 2013-06-28 | 2013-11-06 | 句容市百事特复合材料有限公司 | Long and short fiber composite strengthening thermoplastic plastic particle material and production method thereof |
| CN104029401A (en) * | 2014-05-30 | 2014-09-10 | 南京航空航天大学 | Method for preparing phenolic resin system Z-pin by using twisted carbon fibers |
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Effective date of registration: 20201228 Address after: 212028 66 and 68 changxiangdong Avenue, Dantu District, Zhenjiang City, Jiangsu Province Patentee after: Jiangsu Deqing New Material Co.,Ltd. Address before: No. 399 Bingshui Road, Xiqing District, Tianjin, Tianjin Patentee before: TIANJIN POLYTECHNIC University |