CN104270840B - Thermoplastic composite resistance welded insulated heating element and preparation method - Google Patents
Thermoplastic composite resistance welded insulated heating element and preparation method Download PDFInfo
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- CN104270840B CN104270840B CN201410439057.1A CN201410439057A CN104270840B CN 104270840 B CN104270840 B CN 104270840B CN 201410439057 A CN201410439057 A CN 201410439057A CN 104270840 B CN104270840 B CN 104270840B
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Abstract
The present invention relates to resistance welded heating element and preparation method thereof, disclose a kind of thermoplastic composite resistance welded insulated heating element and preparation method.In the present invention, this insulated heating element comprises the Conductive Core, insulating barrier and the resin bed that are combined with each other, and Conductive Core is used as heater; Insulating barrier lays respectively at the outside of Conductive Core, leaks outside for intercepting electric current; Resin bed lays respectively at the outside of insulating barrier, and selects thermoplastic resin.Insulated heating element of the present invention can intercept electric current well and leak outside, easy to use, and material paving loaded down with trivial details before eliminating welding covers program; Degree of steeping is good, and weld strength is large; Quick serialization preparation can be carried out according to the shape of solder side and size.Compared with die pressing, the inventive method simple and fast, and do not need mould, greatly save manufacturing cost.
Description
Technical field
The present invention relates to thermoplastic composite melting interconnection technique field, particularly a kind of resistance welded heating element and preparation method thereof.
Background technology
The large advantage of fiber reinforced thermolplastic composite material in manufacturing technology realizes large area integrated molding by the structural design of specialty and preparation technology, significantly reduces structural member and securing member quantity.But very complicated for shape or that size is very large goods are still difficult to realize one-shot forming at present, connect and just become inevitable step.The quality of quality of connection has material impact to integrality performance of the structure.
Traditional method of attachment, as mechanical connection and cementing connection are not all suitable for fiber reinforced thermolplastic composite material.Resistance welding techniques have equipment simple and flexible, technological process short, do not need surface treatment, strength of joint advantages of higher, be a kind of promising approach of sweating heat plastic composites of economical and efficient.
But because carbon fiber has certain conductivity, the phenomenon that heating element leaks electricity to composite body is easily there is when actual welding continuous carbon fibre strengthens thermoplastic composite, cause welding temperature seriously uneven, quality is unstable, bonding strength does not reach desired value, hinders applying of the method.
Current solution is mostly directly cover a two-layer resin molding at heating of metal net or carbon fiber surface before welding, form dielectric isolation layer, but there is paving and cover the problems such as loaded down with trivial details, dipping poor, hole is many, anticreep instability, and the existence of resin-rich area also can reduce the bearing capacity of junction, therefore the actual effect of said method and applicability not strong.Develop a kind of heating element that can effectively insulate concerning high-performance carbon fibre strengthen thermoplastic composite resistance welding techniques tool be of great significance.
Summary of the invention
Thermoplastic composite resistance welded insulated heating element that the object of the present invention is to provide a kind of method for making easy and easy to use and preparation method thereof.
In a first aspect of the present invention, provide a kind of thermoplastic composite resistance welded insulated heating element, this insulated heating element comprises the Conductive Core (1), insulating barrier (2) and the resin bed (3) that are combined with each other, wherein
Described Conductive Core (1) is as heater, and described Conductive Core selects wire netting, carbon fiber;
Described insulating barrier (2) lays respectively at the outside of described Conductive Core, leaks outside for intercepting electric current, and described insulating barrier selects glass mat, glass fabric or its combination; With
Described resin bed (3) lays respectively at the outside of described insulating barrier, and described resin bed is thermoplastic resin.
In another preference, described Conductive Core, insulating barrier and/or resin bed are single or multiple lift structure, namely have one or more subgrade.
In another preference, Conductive Core is lay multilayer material simultaneously, can increase the maximum current flux of heating element.
In another preference, Conductive Core can use carbon fibre fabric and unidirectional continuous carbon fibre simultaneously, can strengthen the mechanical strength on certain direction.
In another preference, (3') described insulated heating element also has assisted resin layer between Conductive Core (1) and insulating barrier (2).Described assisted resin layer is used for the degree of steeping improving heating element further, eliminates the residual porosity of heating element inside, and be conducive to the heat transfer in welding process and suppress defect to produce, therefore weld strength is large.
In another preference, the material of described resin bed (3) is identical with the material of the matrix of composite material to be welded or substantially identical.
In another preference, described assisted resin layer material is (3') identical with the material of resin bed (3) or substantially identical.
In another preference, in described insulating barrier and described Conductive Core, containing the resin material penetrated in the gap of described insulating barrier and described Conductive Core.
In another preference, the wire netting that described Conductive Core is selected includes but not limited to wire netting, stainless steel cloth and copper mesh, and diameter wiry is 0.02 ~ 0.5mm, and aperture is 0.02 ~ 1.0mm.
In another preference, the carbon fiber that described Conductive Core is selected comprises unidirectional continuous carbon fibre and carbon fibre fabric, the type of weave of fabric includes but not limited to plain cloth, twills, satin fabric, one-way fabric, multi-axial tricot, and the surface density of fabric is less than 300g/m
2.
In another preference, the surface density of the glass mat that described insulating barrier is selected and glass fabric is not more than 100g/m
2, described glass mat includes but not limited to shortly cut felt, continuous felt, surperficial felt, composite felt, and described glass fabric includes but not limited to plain cloth, twills, satin fabric, one-way fabric, multi-axial tricot.
In another preference, the thermoplastic resin consistent with the matrix of wanted soldering composite material that described resin bed is selected comprises polypropylene (PP), polyethylene (PE), polyphenylene sulfide (PPS), PEKK (PEKK), polyether-ether-ketone (PEEK), Polyetherimide (PEI); And/or
The appearance forrns of resin includes but not limited to film, fibrofelt and nonwoven fabrics; And/or
Surface density is not more than 100g/m
2; And/or
The total content scope of resin described in described insulated heating element is 40% ~ 70%.
In another preference, the consistent size of described insulating barrier and resin bed, and the length of Conductive Core or width are than described insulating barrier and resin bed greatly at least 5cm.
In a second aspect of the present invention, provide the preparation method of thermoplastic composite resistance welded insulated heating element described in a kind of first aspect present invention, adopt melt impregnating process, comprise the following steps:
Step a: by the Conductive Core selected, insulating barrier and resinous layer material according to after suitable shape and size cutting, laying in a certain order;
Step b: according to the fusing point of used resin, setting double-steel belt pressing machine is suitable heating-up temperature, gait of march and nip;
Step c: reach until temperature and after set point, the material of order laying is put into double-steel belt pressing machine and pressurize and cool.
In another preference, when described Conductive Core adopts wire netting, before described step a, also comprise step a0:
Acetone or alkaline detergent wash is used to fall the oil stain on described wire netting surface, and/or working concentration is the silane coupler-ethanolic solution of 2 ~ 10%, zinc or manganese-series phosphorized dose, mordant carries out surface treatment to wire netting, laying again after oven dry, can improve the interfacial bond strength of heating element inner wire and interlaminar resin.
In another preference, between described step a and step b, also comprise step:
Respectively place one deck release cloth in laying material upper and lower surface, or spray high temperature resistant release agent in steel strip surface and be convenient to the demoulding, prevent resin from sticking on steel band; Described release cloth comprises polyimide film, aluminium foil or polytetrafluoroethylene film, large more than the 5cm of length-width ratio laying material of described release cloth.
In another preference, in described step b, described heating-up temperature should be set in more than described melting point resin 20 ~ 80 DEG C, and far below the heat decomposition temperature of resin; And/or
After described step c, also comprise step:
To the further cutting of described heating element, be divided into the heating element that several are less, the length of the Conductive Core of the heating element that the direction of segmentation should make each segmentation obtain or width dimensions are greater than insulating barrier and size corresponding to resin bed.
In a third aspect of the present invention, provide a kind of thermoplastic composite through welding, described thermoplastic composite be with thermoplastic composite resistance welded insulated heating element described in first aspect present invention as weldment, make through resistance welded.
Should be understood that within the scope of the present invention, above-mentioned each technical characteristic of the present invention and can combining mutually between specifically described each technical characteristic in below (eg embodiment), thus form new or preferred technical scheme.As space is limited, tiredly no longer one by one to state at this.
Accompanying drawing explanation
Fig. 1 is a kind of basic ply angles (a) of thermoplastic composite resistance welded insulated heating element and cross section (b) schematic diagram of finished product in first embodiment of the invention;
Fig. 2 is a kind of ply angles (a) of thermoplastic composite resistance welded insulated heating element and cross section (b) schematic diagram of finished product using two-layer conductive core material in second embodiment of the invention;
Fig. 3 is the ply angles (a) of thermoplastic composite resistance welded insulated heating element and cross section (b) schematic diagram of finished product of a kind of use three layers of conductive core material in second embodiment of the invention;
Fig. 4 is the schematic flow sheet of the preparation method of a kind of thermoplastic composite resistance welded insulated heating element in third embodiment of the invention.
1-Conductive Core; 2-insulating barrier; 3-resin bed; 3'-assisted resin layer; 4-resin more than needed.
Embodiment
The present inventor, through extensively and in depth studying, develops a kind of structure unique first, manufactures and uses thermoplastic composite resistance welded insulated heating element all very easily.This insulated heating element described comprises the Conductive Core (1), insulating barrier (2) and the resin bed (3) that are combined with each other.Heating element of the present invention is integral type, easy to use, and material paving loaded down with trivial details before eliminating welding covers program; Quick serialization preparation can be carried out according to the shape of solder side and size, than die pressing simple and fast, and not need mould, greatly save manufacturing cost.Complete the present invention on this basis.
Thermoplastic composite resistance welded insulated heating element
In the following description, many ins and outs are proposed in order to make reader understand the application better.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations of following execution mode and amendment, also can realize each claim of the application technical scheme required for protection.
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
First embodiment of the invention relates to a kind of thermoplastic composite resistance welded insulated heating element, and Fig. 1 is the basic ply angles (a) of this thermoplastic composite resistance welded insulated heating element and cross section (b) schematic diagram of finished product.
Specifically, as shown in (a) in Fig. 1, this thermoplastic composite resistance welded insulated heating element comprises the Conductive Core 1, insulating barrier 2 and the resin bed 3 that are combined with each other, wherein,
Described Conductive Core 1 is used as heater, and described Conductive Core selects wire netting, carbon fiber;
Described insulating barrier 2 lays respectively at the outside of described Conductive Core, leaks outside for intercepting electric current, and described insulating barrier selects glass mat, glass fabric or its combination; With
Described resin bed 3 lays respectively at the outside of described insulating barrier, and described resin bed is thermoplastic resin.
After Fig. 1 (a) Suo Shi, laminated material is made into heating element finished figure 1 (b), the complete melting of resin bed has also penetrated among insulating barrier 2 and Conductive Core 1, combine together, fill by grey in figure (b) and represent that resin where, unnecessary resin then defines the resin more than needed 4 as shown in Fig. 1 (b).
Conductive Core 1 selects wire netting or carbon fiber, as heater.
Insulating barrier 2 selects glass mat or glass fabric, leaks outside for intercepting electric current.
Resin bed 3 selects the thermoplastic resin film consistent with the matrix of institute soldering composite material.
The wire netting that Conductive Core 1 is selected includes but not limited to wire netting, stainless steel cloth and copper mesh, and diameter wiry is 0.02 ~ 0.5mm, and aperture is 0.02 ~ 1.0mm.The carbon fiber that Conductive Core 1 is selected comprises unidirectional continuous carbon fibre and carbon fibre fabric, and the type of weave of fabric includes but not limited to plain cloth, twills, satin fabric, one-way fabric, multi-axial tricot, and the surface density of fabric is less than 300g/m
2." one-way fabric " refers to that fabric is formed primarily of warp fiber, a kind of fabric that weft fiber proportion is few.It and unidirectional continuous carbon fibre are different, and the latter is the carbon fibre thread without any braiding.
The surface density of the glass mat that insulating barrier 2 is selected and glass fabric is not more than 100g/m
2, glass mat includes but not limited to shortly cut felt, continuous felt, surperficial felt, composite felt, and glass fabric includes but not limited to: plain cloth, twills, satin fabric, one-way fabric, multi-axial tricot.
The thermoplastic resin film consistent with the matrix of wanted soldering composite material that resin bed 3 is selected comprises polypropylene (PP), polyethylene (PE), polyphenylene sulfide (PPS), PEKK (PEKK), polyether-ether-ketone (PEEK), Polyetherimide (PEI), the appearance forrns of resin molding includes but not limited to film, fibrofelt and nonwoven fabrics, and surface density is not more than 100g/m
2.
Preferably, in order to ensure the dipping effect that heating element is inner good, the resin content used is greater than the total content of sandwich layer and insulating layer material, and resin content scope is 40% ~ 70%; In order to ensure that heater element surface has enough resins for adhesive composite materials, during laying, upper and lower outmost surface all wants suitably to put resin molding or the larger resin molding of lay surface density more, makes the upper and lower surface of prepared heating element have the thick resin 4 more than needed of 0.2 ~ 0.5mm.
Insulated heating element prepared by the present invention can intercept electric current well and leak outside, and due to this element be integral type, easy to use, loaded down with trivial details before eliminating welding material paving covers program.Degree of steeping is good, and weld strength is large.Quick serialization preparation can be carried out according to the shape of solder side and size, than die pressing simple and fast, and not need mould, greatly save manufacturing cost.
Second embodiment of the invention relates to a kind of thermoplastic composite resistance welded insulated heating element, Fig. 2 is the ply angles (a) of thermoplastic composite resistance welded insulated heating element and cross section (b) schematic diagram of finished product that use two-layer conductive core material, and Fig. 3 is the ply angles (a) of thermoplastic composite resistance welded insulated heating element and cross section (b) schematic diagram of finished product of use three layers of conductive core material.
Second execution mode improves on the basis of the first execution mode, and main improvements are: Conductive Core is the two-layer or trilaminate material of lay simultaneously, can increase the maximum current flux of heating element.Conductive Core uses carbon fibre fabric and unidirectional continuous carbon fibre simultaneously, can strengthen the mechanical strength on certain direction.Also comprise one deck assisted resin layer between insulating barrier and Conductive Core, can increase resin content or dipping effect, be conducive to the heat transfer in welding process and suppress defect to produce, therefore weld strength is large.The length of Conductive Core or width than insulating barrier and resin bed large, the joint connecting power supply can be reserved at heating element two ends.Specifically:
Preferably, Conductive Core 1 can simultaneously lay be two-layer or three layers.
In another preference, ply sequence is resin bed/insulating barrier/resin bed/Conductive Core/resin bed/Conductive Core/resin bed/insulating barrier/resin bed.
Conductive Core 1 uses carbon fibre fabric and unidirectional continuous carbon fibre simultaneously.
In another preference, layering type is resin/insulating barrier/resin/carbon fibre fabric/resin/unidirectional continuous carbon fibre/resin/insulating barrier/resin.
Preferably, one deck assisted resin layer 3' is also comprised between insulating barrier 2 and Conductive Core 1.
In another preference, layering type is resin bed/insulating barrier/resin bed/Conductive Core/resin bed/insulating barrier/resin bed.
Preferably, the consistent size of insulating barrier 2 and resin bed 3, and the length of Conductive Core 1 or width are than insulating barrier 2 and resin bed 3 greatly at least 5cm.
Preparation method
Present invention also offers a kind of preparation method of thermoplastic composite resistance welded insulated heating element, Fig. 4 is the schematic flow sheet of the preparation method of this thermoplastic composite resistance welded insulated heating element.
As shown in Figure 4, the preparation method of this thermoplastic composite resistance welded insulated heating element adopts melt impregnating process, comprises the following steps:
Step a: by the Conductive Core selected, insulating barrier and resinous layer material according to after suitable shape and size cutting, laying in a certain order.
Step b: according to the fusing point of used resin, setting double-steel belt pressing machine is suitable heating-up temperature, gait of march and nip.
Step c: reach until temperature and after set point, the material of order laying is put into double-steel belt pressing machine and pressurize and cool.
Preferably prepare in the process of heating element of the present invention, the resin of described resin bed and assisted resin layer melting can penetrate into described insulating barrier and described Conductive Core inside, and it is as a whole to cool consolidation.
Another execution mode of the present invention relates to a kind of preparation method of thermoplastic composite resistance welded insulated heating element, this execution mode improves on the basis of basic embodiment, main improvements are: during Conductive Core employing wire netting, also comprise the oil stain of clean metal net surface and/or use chemical reagent to carry out surface-treated step, the interfacial bond strength of heating element inner wire and interlaminar resin can be improved.After laying in a certain order, be also included in the step that laying material upper and lower surface respectively places one deck release cloth, or spray high temperature resistant release agent in steel strip surface, be convenient to the demoulding, prevent resin from sticking on steel band.Specifically:
During Conductive Core employing wire netting, before step a, also comprise step a0:
Use acetone or alkaline detergent wash to fall the oil stain on wire netting surface, and/or working concentration is the silane coupler-ethanolic solution of 2 ~ 10%, zinc or manganese-series phosphorized dose, mordant carries out surface treatment to wire netting, laying again after oven dry.
In step a in a certain order after laying, also comprise step:
Respectively place one deck release cloth in laying material upper and lower surface, or spray high temperature resistant release agent in steel strip surface.Release cloth comprises polyimide film, aluminium foil or polytetrafluoroethylene film, large more than the 5cm of length-width ratio laying material of release cloth.
Preferably, in stepb, heating-up temperature should be set in more than melting point resin 20 ~ 80 DEG C, and far below the heat decomposition temperature of resin.
Preferably, after step c, also comprise step:
To the further cutting of heating element, be divided into the heating element that several are less, the length of the Conductive Core of the heating element that the direction of segmentation should make each segmentation obtain or width dimensions are greater than the size of insulating barrier and resin bed.
Compared with prior art, the main distinction and effect thereof comprise embodiment of the present invention:
Insulated heating element prepared by the present invention can intercept electric current well and leak outside, and due to this element be integral type, easy to use, loaded down with trivial details before eliminating welding material paving covers program; Degree of steeping is good, and weld strength is large; Quick serialization preparation can be carried out according to the shape of solder side and size, than die pressing simple and fast, and not need mould, greatly save manufacturing cost.
Below in conjunction with concrete enforcement, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.The experimental technique of unreceipted actual conditions in the following example, the usually conveniently conditioned disjunction condition of advising according to manufacturer.Unless otherwise indicated, otherwise percentage and number calculate by weight.
Embodiment 1
The present embodiment adopts carbon fiber plain (PC), glass felt (GM) and acrylic resin to prepare insulated heating element.Wherein the surface density of carbon fiber plain is 110g/m
2, the surface density of glass felt is 30g/m
2, the surface density of polypropylene non-woven fabric is 50g/m
2.
Step:
1. cutting and laying: polypropylene non-woven fabric and glass felt are of a size of 5 × 50cm
2, carbon fiber plain is of a size of 20 × 50cm
2, polyimide film is of a size of 20 × 60cm
2; Ply stacking-sequence is [PI/PP/PP/GM/PP/PC/PP/GM/PP/PP/PI], and wherein PI is polyimide film.
2. preparation is shaping: setting heating-up temperature is 230 DEG C, and the speed of service is 0.5m/min, and nip is 1.0mm.When temperature reaches 225 ~ 235 DEG C, laying material is put into double-steel belt pressing machine, after about tens minutes, just can obtain shaping goods from the steel belt pressing machine other end, the PI film on its two sides is removed and can obtain larger-size heating element.
3. split: this large scale heating element element is transversely cut off in direction, is divided into 10 5 × 20cm
2small-sized heating element.
Embodiment 2
This example adopts unidirectional carbon fiber dimensional fabric (UC), glass fibre plain (PG) and acrylic resin to prepare insulated heating element.Wherein the surface density of unidirectional carbon fiber dimensional fabric is 200g/m
2, the surface density of glass fibre plain is 50g/m
2, the surface density of polypropylene film is 100g/m
2.
Step:
1. cutting and laying: polypropylene film and glass fibre plain are of a size of 5 × 50cm
2, polyimide film is of a size of 20 × 60cm
2, unidirectional carbon fiber dimensional fabric is of a size of 20 × 50cm
2, wherein 20cm is carbon fiber longitudinal length; Ply stacking-sequence is [PI/PP/PP/PG/PP/UC/PP/PG/PP/PP/PI].
2. preparation is shaping: setting heating-up temperature is 230 DEG C, and the speed of service is 0.5m/min, and nip is 1.2mm.When temperature reaches 225 ~ 235 DEG C, laying material is put into double-steel belt pressing machine, after about tens minutes, just can obtain shaping goods from the steel belt pressing machine other end, the PI film on its two sides is removed and can obtain larger-size heating element.
3. split: this large-size components is cut off along carbon fiber longitudinal direction, is divided into 10 5 × 20cm
2small-sized heating element.
Embodiment 3
The present embodiment adopts stainless steel cloth (SSM), glass fabric and polyphenylene sulfide to prepare insulated heating element.Wherein glass fabric is 2/2 twill (TG), and its surface density is 100g/m
2, PPS (polyphenylene sulfide) films surface density is 50g/m
2, stainless steel wire diameter is 0.04mm, and aperture is 0.04mm.
Step:
1. cutting, cleaning: PPS (polyphenylene sulfide) films and glass fabric are of a size of 5 × 10cm
2, stainless steel cloth is of a size of 5 × 20cm
2, aluminium foil (AF) is of a size of 15 × 30cm
2; By stainless steel cloth acetone or alkaline detergent wash 1 ~ 3 time, to remove surperficial oil stain, to be then positioned in convection oven dry 30 ~ 60min at 80 DEG C.
2. laying: material is completed in the following order: [AF/PPS/PPS/TG/SSM/TG/PPS/PPS/AF].
3. preparation is shaping: setting heating-up temperature is 340 DEG C, and the speed of service is 0.4m/min, and nip is 1.0mm.When temperature reaches 335 ~ 345 DEG C, laying material is put into double-steel belt pressing machine, after about tens minutes, just can obtain shaping goods from the steel belt pressing machine other end, after being removed by the aluminium foil on its two sides, can insulated heating element be obtained.
Embodiment 4
The present embodiment adopts stainless steel cloth, glass felt and acrylic resin to prepare insulated heating element.Wherein the surface density of glass felt is 30g/m
2, polypropylene film surface density is 50g/m
2, stainless steel wire diameter is 0.07mm, and aperture is 0.1mm.
Step:
1. cutting: polypropylene film and glass felt are of a size of 5 × 10cm
2, stainless steel cloth is of a size of 5 × 20cm
2, aluminium foil (AF) is of a size of 15 × 30cm
2.
2. cleaning, silane coupler process: use acetone or other alkaline detergent solution cleaning stainless steel cloth, remove surperficial oil stain; The stainless steel cloth washed with de-ionized water of deoiling is put into several times afterwards the water-ethanol solution of KH550 silane coupler, at 20 ~ 50 DEG C, soak 10 ~ 30min, then put into convection oven dry 30 ~ 60min at 200 ~ 260 DEG C.
3. laying: laying in the following order, [AF/PP/PP/GM/SSM/GM/PP/PP/AF].
4. preparation is shaping: setting heating-up temperature is 230 DEG C, and the speed of service is 0.5m/min, and nip is 1.0mm.When temperature reaches 225 ~ 235 DEG C, laying material is put into double-steel belt pressing machine, after about tens minutes, just can obtain shaping goods from the steel belt pressing machine other end, after being removed by the aluminium foil on its two sides, can insulated heating element be obtained.
Embodiment 5
The present embodiment adopts stainless steel cloth, glass felt and polyphenylene sulfide to prepare insulated heating element.Wherein the surface density of glass felt is 50g/m
2, the surface density of PPS (polyphenylene sulfide) films is 100g/m
2, stainless steel wire diameter is 0.1mm, and aperture is 0.15mm.
Step:
1. cutting: polyphenylene sulfide and glass felt are of a size of 5 × 50cm
2, stainless steel cloth is of a size of 20 × 50cm
2, polyimide film is of a size of 20 × 60cm
2.
2. cleaning, surface treatment: use acetone or other alkaline detergent solution cleaning stainless steel cloth, remove surperficial oil stain; The stainless steel cloth washed with de-ionized water of deoiling is put into several times afterwards hydrochloric acid solution or the Zinc phosphating solution of concentration 10 ~ 20%, use washed with de-ionized water several times soak 10 ~ 30min at 20 ~ 50 DEG C after, then be placed in convection oven dry 30 ~ 60min at 50 ~ 150 DEG C.
3. laying: by material laying in the following order: [PI/PPS/GM/SSM/GM/PPS/PI].
4. preparation is shaping: setting heating-up temperature is 340 DEG C, and the speed of service is 0.4m/min, and nip is 1.0mm.When temperature reaches 335 ~ 345 DEG C, laying material is put into double-steel belt pressing machine, after about tens minutes, just can obtain shaping goods from the steel belt pressing machine other end, after being removed by the PI film on its two sides, larger-size insulated heating element can be obtained.
5. split: heating element broad ways is cut off and becomes 10 5 × 20cm
2small-sized heating element.
Embodiment 6
The present embodiment adopts two kinds of carbon fibre fabrics, glass fabric and polyphenylene sulfides to prepare insulated heating element.Wherein carbon fibre fabric one is plain, and surface density is 110g/m
2, another kind is unidirectional lamination, and surface density is 200g/m
2, glass fibre is plain, and surface density is 30g/m
2, PPS (polyphenylene sulfide) films surface density is 50g/m
2.
Step:
1. cutting and laying: PPS (polyphenylene sulfide) films and glass fabric are of a size of 5 × 10cm
2, carbon fibre fabric and unidirectional cloth are of a size of 5 × 20cm
2; Ply stacking-sequence is [PPS/PPS/PG/PPS/PC/PPS/UC/PPS/PG/PPS/PPS].
2. coating release agent: first use mould cleaner that cleaning steel is clean, then uses watering can respectively to spray 1 ~ 2 layer of high temperature resistant release agent on the surface of upper and lower steel band, places half an hour and treat that release agent solidifies completely.
3. preparation is shaping: setting heating-up temperature is 340 DEG C, and the speed of service is 0.4m/min, and nip is 1.5mm.When temperature reaches 335 ~ 345 DEG C, laying material is put into double-steel belt pressing machine, after about tens minutes, just can obtain shaping insulated heating element from the steel belt pressing machine other end.
Embodiment 7
The present embodiment adopts copper mesh (CM), glass fabric and polyether-ether-ketone resin to prepare insulated heating element.Wherein the diameter of copper wire is 0.1mm, and aperture is 0.15mm, and the surface density of glass fibre plain is 60g/m
2, the surface density of poly (ether ether ketone) film is 100g/m
2.
Step:
1. cutting and laying: poly (ether ether ketone) film and glass fibre plain are of a size of 5 × 50cm
2, aluminium foil is of a size of 20 × 60cm
2, copper mesh is of a size of 20 × 50cm
2; Ply stacking-sequence is [AF/PEEK/PG/CM/PG/PEEK/AF].
2. preparation is shaping: setting heating-up temperature is 370 DEG C, and the speed of service is 0.5m/min, and nip is 1.0mm.When temperature reaches 365 ~ 375 DEG C, laying material is put into double-steel belt pressing machine, after about tens minutes, just can obtain shaping goods from the steel belt pressing machine other end, after being removed by the aluminium foil on its two sides, can insulated heating element be obtained.
Embodiment 8
In the present embodiment, the heating element prepared for embodiment 3 introduces using method.
Be placed in by this heating element between two pieces of CF/PPS composite material flat plates that will weld, and then be placed between two pieces of heat insulation planks on welding equipment platform, and compress with air pump pressue device, pressure is 0.5MPa; The wire netting that heating element two ends are stretched out is respectively fixed on the positive and negative electrode of DC power supply; Open DC power supply, regulation voltage level is 20V, timing 60s, powered-down; Wait for that the temperature of soldering composite material is down to room temperature naturally, get final product unloading pressure, take out weldment.
After measured, welding effect is desirable, and bonding strength is high, reaches design and use requirement completely.
The all documents mentioned in the present invention are quoted as a reference all in this application, are just quoted separately as a reference as each section of document.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after having read above-mentioned instruction content of the present invention.
Claims (10)
1. a thermoplastic composite resistance welded insulated heating element, is characterized in that, this insulated heating element comprises the Conductive Core (1), insulating barrier (2) and the resin bed (3) that are combined with each other, wherein,
Described Conductive Core (1) is as heater, and described Conductive Core selects wire netting, carbon fiber;
Described insulating barrier (2) lays respectively at the outside of described Conductive Core, leaks outside for intercepting electric current, and described insulating barrier selects glass mat, glass fabric or its combination; With
Described resin bed (3) lays respectively at the outside of described insulating barrier, and described resin bed is thermoplastic resin.
2. thermoplastic composite resistance welded insulated heating element according to claim 1, it is characterized in that, the wire netting that described Conductive Core is selected comprises wire netting, stainless steel cloth and copper mesh, and diameter wiry is 0.02 ~ 0.5mm, and the aperture of wire netting is 0.02 ~ 1.0mm; And/or
The carbon fiber that described Conductive Core is selected comprises unidirectional continuous carbon fibre and carbon fibre fabric, and the type of weave of fabric comprises plain cloth, twills, satin fabric, one-way fabric, multi-axial tricot, and the surface density of fabric is less than 300g/m
2.
3. thermoplastic composite resistance welded insulated heating element according to claim 1, it is characterized in that, the surface density of the glass mat that described insulating barrier is selected and glass fabric is not more than 100g/m
2, described glass mat comprises shortly cuts felt, continuous felt, surperficial felt, composite felt, and described glass fabric comprises plain cloth, twills, satin fabric, one-way fabric, multi-axial tricot.
4. thermoplastic composite resistance welded insulated heating element according to claim 1, it is characterized in that, the thermoplastic resin consistent with the matrix of wanted soldering composite material that described resin bed is selected comprises polypropylene (PP), polyethylene (PE), polyphenylene sulfide (PPS), PEKK (PEKK), polyether-ether-ketone (PEEK), Polyetherimide (PEI); And/or
The appearance forrns of resin comprises film, fibrofelt and nonwoven fabrics; And/or
Surface density is not more than 100g/m
2; And/or
The total content scope of resin described in described insulated heating element is 40% ~ 70%.
5. according to described thermoplastic composite resistance welded insulated heating element arbitrary in claim 1-4, it is characterized in that, described Conductive Core can lay be two-layer or three layers simultaneously, is covered with one deck assisted resin layer between every two-layer Conductive Core; And/or
Conductive Core can use carbon fibre fabric and unidirectional continuous carbon fibre simultaneously.
6. a preparation method for thermoplastic composite resistance welded insulated heating element, adopts melt impregnating process, it is characterized in that, comprise the following steps:
Step a: by the Conductive Core selected, insulating barrier and resinous layer material according to after suitable shape and size cutting, laying in a certain order;
Step b: according to the fusing point of used resin, setting double-steel belt pressing machine is suitable heating-up temperature, gait of march and nip;
Step c: reach until temperature and after set point, the material of described order laying is put into double-steel belt pressing machine and pressurize and cool.
7. method according to claim 6, is characterized in that, during described Conductive Core employing wire netting, before described step a, also comprises step a0:
Use acetone or alkaline detergent wash to fall the oil stain on described wire netting surface, and/or working concentration is the silane coupler-ethanolic solution of 2 ~ 10%, zinc or manganese-series phosphorized dose, mordant carries out surface treatment to wire netting, laying again after oven dry.
8. method according to claim 7, is characterized in that, between described step a and step b, also comprises step:
Respectively place one deck release cloth in laying material upper and lower surface, or spray high temperature resistant release agent in steel strip surface; Described release cloth comprises polyimide film, aluminium foil or polytetrafluoroethylene film, large more than the 5cm of length-width ratio laying material of described release cloth.
9. method according to claim 7, is characterized in that, in described step b, described heating-up temperature should be set in more than described melting point resin 20 ~ 80 DEG C, and far below the heat decomposition temperature of resin; And/or
After described step c, also comprise step:
To the further cutting of described heating element, be divided into the heating element that several are less, the length of the Conductive Core of the heating element that the direction of segmentation should make each segmentation obtain or width dimensions are greater than insulating barrier and size corresponding to resin bed.
10. through a thermoplastic composite for welding, it is characterized in that, described thermoplastic composite uses arbitrary described thermoplastic composite resistance welded insulated heating element in claim 1-5 as weldment, to make through resistance welded.
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| CN106182840A (en) * | 2016-07-11 | 2016-12-07 | 威海光威复合材料股份有限公司 | The manufacture method of composite material with high electric conductivity pipe |
| CN106317618A (en) * | 2016-08-18 | 2017-01-11 | 上海闵轩钢结构工程有限公司 | Novel resistance welding heating unit and preparation method thereof |
| CN109571976A (en) * | 2017-09-28 | 2019-04-05 | 中国商用飞机有限责任公司 | Method for welding the thermoplastic composite component of continuous fiber reinforcement |
| CN113647195A (en) * | 2019-02-01 | 2021-11-12 | 谢尔·林斯科格 | Apparatus and method for heating a mat |
| CN110356012B (en) * | 2019-06-21 | 2021-06-29 | 沈阳航空航天大学 | CNT array modified heating element and composite material resistance welding joint and manufacturing method thereof |
| CN110606762B (en) * | 2019-09-27 | 2021-12-14 | 长沙晟天新材料有限公司 | Carbon fiber composite skull repairing piece and preparation method thereof |
| CN111086224A (en) * | 2019-12-20 | 2020-05-01 | 中航复合材料有限责任公司 | Solder for resistance welding of thermoplastic composite material, preparation method and application thereof |
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