CN106496941A - One kind can repairing type carbon cloth reinforced epoxy sheet material and its preparation, restorative procedure - Google Patents
One kind can repairing type carbon cloth reinforced epoxy sheet material and its preparation, restorative procedure Download PDFInfo
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- CN106496941A CN106496941A CN201610961247.9A CN201610961247A CN106496941A CN 106496941 A CN106496941 A CN 106496941A CN 201610961247 A CN201610961247 A CN 201610961247A CN 106496941 A CN106496941 A CN 106496941A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/06—Elements
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention provides one kind can repairing type carbon cloth reinforced epoxy sheet material and its preparation、Restorative procedure，Its raw material includes 100 weight portion of epoxy resin、5 20 weight portions of firming agent A、10 40 weight portions of firming agent B、0.1 5 weight portion of accelerator、And least one layer of carbon cloth，Firming agent A is selected from anhydrides、One or more of the firming agent of carboxylic acidss，Firming agent B is selected from anhydrides、One or more of firming agent beyond carboxylic acidss，Accelerator is selected from calcium salt、Zinc salt、One or more of iron salt，The present invention's can repairing type carbon cloth reinforced epoxy plate，Except the rigidity with general carbon cloth reinforced epoxy plate greatly、Hardness is high、Heatproof is high、Nonflammable、Outside the features such as product size good stability，Also there is recoverability，Easily the damage occurred during use can be repaired，Mechanical property after the reparation mechanical property initial with resin plate is basically identical，And repair process is simple，With low cost.
Description
Technical field
The present invention relates to a kind of carbon cloth epoxy resin composite material, more particularly to one kind can the increasing of repairing type carbon cloth
Strong epoxy resin sheet material and its preparation, restorative procedure, belong to high score Material Field.
Background technology
Carbon fibre composite is the very noticeable new material of the class for emerging, and it can take into account carbon fiber
Become the more excellent structural timber of combination property with the performance of matrix and the functional material with property, mainly
It is divided into carbon fiber resin matrix composite and metal-base composites.Metallic matrix has high intensity, thermostability, electrical and thermal conductivity
And the performance such as anti-moisture absorption is aging, but its manufacturing process and internal structure are more complicated, and research at this stage is mainly optimization design, and which is made
Technique is made, improves the compatibility of carbon fiber and matrix, given full play to the performance advantage of this composite, and then open up which and apply
Market.Polymer matrix composites develop prior to metal-base composites, start from the initial stage sixties, are in fiberglass reinforced plastics
Grow up on the basis of (fiberglass).As its proportion is little, mechanical property and chemical property are preferable, obtain from the eighties
Extensive popularization and application, are used as aircraft light material, and the reduction with cost in a large number, in machinery, chemical industry, automobile, voluntarily
Also obtain in the device such as the constitutional details such as car and sports and amusement and be widely applied.
Epoxy resin is excellent thermosetting resin, and it is had compared with the unsaturated polyester resin that widely applies at present
More excellent physical property, electrical insulation capability, resistance to chemical corrosion, heat-resisting and bond propertiess, are most universal, most important at present
A kind of matrix material and structural material.Carbon-fibre reinforced epoxy resin composite material, its specific strength, specific modulus aggregative indicator,
It is highest in existing structure material.In the field that rigidity, weight, fatigue properties etc. have strict demand, high temperature, change is being required
The high occasion of stability is learned, carbon fibre composite all has much advantage.Show that China is fine currently used for epoxy radicals according to rough investigation
Dimension strengthens epoxy resin total amount needed for composite at 150,000 tons or so, and is increased with 20% speed every year.
Carbon-fibre reinforced epoxy resin composite material occurs damage in use.As epoxy resin is thermosetting
Material, once so damaging occurs in carbon-fibre reinforced epoxy resin composite material, it is impossible to as thermoplastic, using heating
Again moulding method repaired.Current restorative procedure is usually in injury region Bonded Repair piece, or applies asphalt mixtures modified by epoxy resin
The method of lipoprotein solution solidify afterwards is repaired.The former affects the outward appearance of composite, and the mechanical property after repairing is generally below
The latter.Although the latter is better than the former in the mechanical property in outward appearance, after repairing, as epoxy resin is thermosets,
During reparation, the epoxy molecule segment in damaged material cannot occur molecule with reparation epoxy molecule segment
The entanglement of level, the mechanical property after causing to repair still are unable to reach the initial performance of composite.
Content of the invention
For solving the above problems, the invention provides one kind can repairing type carbon cloth reinforced epoxy sheet material, by weight
The following components of amount part meter：
And least one layer of carbon cloth.
Described epoxy resin is a kind of epoxy oligomer, just can form three-dimensional netted thermosetting with firming agent when reacting
Plastics.Classification of chemical structure is pressed, (+)-2,3-Epoxy-1-propanol ethers, such as bisphenol A-type, bisphenol-f type, bisphenol S type, hydrogenated bisphenol A can be divided into
Type, phenol aldehyde type etc.；(+)-2,3-Epoxy-1-propanol esters, such as o-phthalic acid diglycidyl ester class etc.；(+)-2,3-Epoxy-1-propanol amine, such as four shrinks are sweet
Oily diaminodiphenyl-methane；Cycloaliphatic epoxy resin class, epoxidation of olefins class etc..
Firming agent A be anhydrides, one or more of the firming agent of carboxylic acidss, firming agent B is selected from anhydrides, carboxylic acid
One or more of firming agent beyond class, such as amine curing agent, polyesters firming agent, the one kind in thiorubber. firming agent
Or multiple, accelerator selected from calcium salt, zinc salt, one or more of iron salt.
Firming agent A is more than 8 or 8 anhydrides of carbon number, omega-dicarboxylic acids, the one kind or many in multi-carboxylic acid's firming agent
Kind, acid anhydride type curing agent A is phthalic anhydride, tetrabydrophthalic anhydride, hexahydrotoluene tetracarboxylic dianhydride, trimellitic anhydride
One or more；Omega-dicarboxylic acids firming agent A is DC11, SL-AH, the one kind in tridecanyldicarboxylic acid
Or it is multiple；One or more；The preferred phthalic anhydrides of firming agent A and SL-AH, phthalic anhydride and 12 carbon
When binary acid is used in mixed way, with synergistic effects, the tensile strength of material after repairing can greatly be improved.Mixed proportion, presses
Weight meter, phthalic anhydride:SL-AH is 1：0.5～2, preferably 1：0.75～1.25.Firming agent A is in accelerator
Esterification can occur with epoxy resin under effect, the macromolecular chain in epoxy resin is crosslinked.Meanwhile, the molecule after solidification
Chain, in the presence of dihydroxylic alcohols, can rupture under uniform temperature, so as to allow epoxy resin to dissolve.When the concentration of dihydroxylic alcohols gradually drops
After low, firming agent A can be reacted with epoxy resin in the presence of accelerator again, made epoxy resin cure, can be repaired so as to play
Effect.
Wherein, can in repairing type carbon cloth reinforced epoxy sheet material, relative to 100 weight portion of epoxy resin, Gu
The content of agent A is 5～20 weight portions, it is preferable that the content of firming agent A is 8～15 weight portions.When the content of firming agent A is less than 5
After weight portion, recoverable effect is not had；After the content of firming agent A is more than 20 weight portion, the mechanicalness of epoxy resin board
Can be deteriorated.
Firming agent B of the present invention is selected from amine curing agent, modified amine curing agent, amide-type firming agent, polyesters solidification
Agent, imidazole curing agent, one or more in thiorubber. firming agent.Firming agent B can be crosslinked instead with epoxy resin
Should, promote resin solidification, it may ensure that the epoxy resin of solidification has good mechanical strength and heat stability, but this solid
Change is irreversible, it is impossible to repaired.
Wherein, can in repairing type carbon cloth reinforced epoxy sheet material, relative to 100 weight portion of epoxy resin, Gu
The content of agent B is 10～40 weight portions, it is preferable that 15～30 weight portions.After the content of firming agent B is more than 40 weight portion, ring
The recoverability of oxygen resin plate is deteriorated；After the content of firming agent B is less than 10 weight portion, the mechanical performance of epoxy resin board becomes
Difference.
Further, accelerator of the invention selected from citric acid, stearic acid, octanoic acid, n-nonanoic acid, the calcium salt of acetic acid, zinc salt,
One or more in iron salt, optimization citric acid calcium, n-nonanoic acid ferrum.Can promote firming agent A, with epoxy resin, chemical reaction occurs, from
And promote the solidification of resin.Meanwhile, accelerator can make the strand after solidification again, in uniform temperature in the presence of dihydroxylic alcohols
Lower fracture, so as to allow epoxy resin to dissolve.After the concentration of dihydroxylic alcohols is gradually lowered, firming agent A again can be in the effect of accelerator
The reaction of lower and epoxy resin, promotes epoxy resin cure, so as to play recoverable effect.Wherein, can repairing type in described
In carbon cloth reinforced epoxy sheet material, relative to 100 weight portion of epoxy resin, the content of accelerator is 0.1～5 weight
Part, after the content of accelerator is more than 5 weight portion, the mechanical property of epoxy resin board is deteriorated；When the content of accelerator is less than 0.1
After weight portion, the crosslinking curing speed of epoxy resin and firming agent A is very slow, substantial unrepairable.It is preferred that 1～3 weight portion.
Carbon cloth is the braided material being formed by weaving with carbon fiber wire, including woven carbon fiber cloth, knitting carbon cloth,
One or more in weaving carbon fiber cloth, carbon fibre initial rinse fabric, carbon fiber nonwoven fabric, are one or more layers.Add carbon
Fiber cloth plays a part of reinforced epoxy, improves the mechanical properties such as its mechanical strength.The addition of carbon cloth presses sheet material
Performance requirement and molding technological condition depending on, typically, relative to 100 weight portion of epoxy resin, carbon cloth is 1-200 weight
Part.
Present invention also offers can repairing type carbon cloth reinforced epoxy sheet material preparation method, including following step
Suddenly：
A, will epoxy resin, firming agent B, solvent add reactor in stir, precuring at 50 DEG C～180 DEG C
Obtain precuring liquid within 0.1 hour～48 hours；
B, firming agent A, accelerator will be added in precuring liquid, and and can appropriate solvent be added on demand to adjust viscosity, be obtained
Arrive mixed liquor；
C, carbon cloth is used the mixed liquor of step b) impregnate, dry and remove solvent；
D, by the product solidified of step c.
Precuring and solidification temperature, in the range of 50 DEG C～180 DEG C, are meeting both process conditions, and satisfaction
On the premise of the performance requirement of precuring liquid and product, arbitrarily can select.
The solvent refers to the liquid that can dissolve or dilute epoxy resin, for reducing system viscosity, to meet processing work
Skill is required.The addition of the solvent and the range of viscosities that must be reached are advisable with meeting processing technique, typically, by epoxy resin
100 weight portion meters, solvent usage amount are 1～2000 weight portion.
The present invention can also repairing type carbon cloth reinforced epoxy sheet material restorative procedure, comprise the following steps：
A, the repair liquid containing dihydroxylic alcohols, epoxy resin, firming agent A is applied to the impaired place of resin plate；
B, impaired place is heated to below 100 DEG C～dihydroxylic alcohols boiling point；
C, maintenance certain time are until resin board surface dissolves；
D, continue to be heated to more than dihydroxylic alcohols boiling point 10 DEG C, make repair liquid volatilize.
Dihydroxylic alcohols be ethylene glycol, diethylene glycol, Propylene Glycol, one or more in butanediol, other dihydroxylic alcohols are to epoxy
The solubility property of resin is poor, the recovery of resin plate performance after being unfavorable for repairing.
In repair liquid, dihydroxylic alcohols are more than or equal to 70 parts by weight, and epoxy resin, the composition of firming agent A, ratio are with former
The formula of resin plate.Under accelerator effect, under uniform temperature, firming agent A and epoxy resin in epoxy resin board
After learning reaction, chemical segment can react with dihydroxylic alcohols, make chemical segment fracture, and then can make the epoxy resin of solidification
Dissolving.This reaction is a reversible reaction, if dihydroxylic alcohols by weight less than 70, be unfavorable for that this reacts molten to solidified resin
The direction of solution is carried out, and the resin of solidification is difficult to dissolve, the recovery of resin plate performance after being unfavorable for repairing.
Epoxy resin and firming agent A in repair liquid can be chosen by the formula of primary resin plate and its composition, it is also possible to no
The formula and its composition for pressing primary resin plate is chosen.But the performance after being repaired with the former is preferred.
The present invention can repairing type carbon cloth reinforced epoxy plate, except with general carbon cloth reinforced epoxy tree
Outside the features such as rigid big, the hardness height of fat plate, high, nonflammable heatproof, product size good stability, also there is recoverability, energy
Easily the damage to occurring during use is repaired, the mechanical property after reparation and the initial mechanical property base of resin plate
This is consistent.And repair process is simple, with low cost.
Specific embodiment
Embodiment 1-7, is operated as follows by the proportioning in table 1
A, epoxy resin, firming agent B, solvent are added and stirred in reactor, precuring 4 hours at 100 DEG C
Arrive precuring liquid；Solvent is ethyl acetate, and its weight is equal to the weight of epoxy resin.
B, will in precuring liquid add firming agent A, accelerator, obtain mixed liquor；
C, carbon cloth (identical with the weight of epoxy resin) is used the mixed liquor of step b) impregnate, dry and remove solvent；
D, mixed liquor is solidified 24 hours at 150 DEG C.
The tensile strength and recoverability of the resin plate that test is obtained, is as a result listed in table 2.
Wherein, restorative procedure is：
A) prepare repair liquid, 90 weight portion of ethylene glycol, epoxy resin, firming agent A total amount be 10 weight portions, ring used
The species and content of oxygen tree fat and firming agent are with each embodiment composition of raw materials.
B) repair liquid is applied to impaired place, and is heated to 180 DEG C；(about 197 DEG C of ethylene glycol boiling point)
C) is maintained certain time until resin board surface dissolves；
D) continue to be heated to 210 DEG C, make repair liquid volatilize.
1 embodiment 1-7 of table, the composition of raw materials (weight portion) of comparative example 1-7
Embodiment and the method for testing performance of comparative example：
Tensile strength：The strip batten that sample is cut into long 10cm, width 1cm, thickness 1mm, using stretching-machine, with 10mm/
The speed of min is stretched to sample, tests its tensile strength.
Recoverability：Any one side in two faces of long 10cm, wide 1cm in above-mentioned tensile strength test sample
On, in the center of length direction, in the width direction, a deep 0.3mm, the rectangle indentation of width 1mm is carved, through whole width
Degree direction, obtains compromised sample.Using repair liquid, repaired by the restorative procedure of each embodiment and comparative example.Test is repaired
The tensile strength of sample, is calculated as follows stretching strength retentivity in front and back.
The tensile strength of the tensile strength/intact sample of sample before stretching strength retentivity (%)=reparation or after repairing
× 100%
2 embodiment 1-7 of table, the performance of comparative example 1-7
Wherein, embodiment 1-7, repaired after, the impaired place of resin plate with before impaired in appearance without notable difference, relative
Before impaired, stretching strength retentivity can reach 70-95%；Comparative example 1,3,6,8 cannot substantially be repaired；Comparative example 2,4,
7 can repair, but initial tensile strength is poor；After comparative example 5 is repaired, substantially impaired vestige, and tensile strength is left in appearance
Conservation rate is relatively low.
Embodiment 8-13
By the preparation method of embodiment 7, precuring temperature is 50 DEG C, and the time is 48 hours, and being prepared according to the proportioning of table 3 can
Repairing type carbon cloth reinforced epoxy plate, evaluates tensile strength and recoverability, and performance is listed in table 3.Restorative procedure is by real
The restorative procedure for applying example 7 is carried out.
The composition of raw materials (weight portion) of 3 embodiment 8-13 of table and performance
Embodiment 14
By embodiment 7 formula and preparation method prepare can repairing type carbon cloth reinforced epoxy plate, precuring temperature
Spend for 180 DEG C, precuring 1 hour, but preparation method step d) is changed to：Mixed liquor II is made to impregnate 2 layers of carbon cloth, and will
After two-layer carbon fiber lamination, dry and remove solvent.Tensile strength and recoverability is evaluated, performance is listed in table 4.Restorative procedure is by real
The restorative procedure for applying example 7 is carried out.
Embodiment 15
By embodiment 7 formula and preparation method prepare can repairing type carbon cloth reinforced epoxy plate, evaluate stretching
Intensity and recoverability, performance are listed in table 4.Restorative procedure is：
A) preparation repair liquid, 1,6- hexanediol (243 DEG C of boiling point) 90 weight portions, epoxy resin, the total amount of firming agent A are 10
The species and content of weight portion, epoxy resin used and firming agent are with 7 composition of raw materials of embodiment.
B) repair liquid is applied to impaired place, and is heated to 200 DEG C；(about 243 DEG C of 1,6-HD boiling point)
C) is maintained certain time until resin board surface dissolves；
D) continue to be heated to 250 DEG C, make repair liquid volatilize.
Embodiment 16
By embodiment 7 formula and preparation method prepare can repairing type carbon cloth reinforced epoxy plate, evaluate stretching
Intensity and recoverability, performance are listed in table 4.Restorative procedure carried out by the restorative procedure of embodiment 7, but the repair liquid for using is matched somebody with somebody
Than for 60 weight portion of ethylene glycol, epoxy resin, the total amount of firming agent A are 40 weight portions, epoxy resin used and firming agent
Species and content are with 7 composition of raw materials of embodiment.
Embodiment 17
By embodiment 7 formula and preparation method prepare can repairing type carbon cloth reinforced epoxy plate, evaluate stretching
Intensity and recoverability, performance are listed in table 4.Restorative procedure carried out by the restorative procedure of embodiment 7, but the repair liquid for using is matched somebody with somebody
Than for 70 weight portion of ethylene glycol, epoxy resin, the total amount of firming agent A are 40 weight portions, epoxy resin used and firming agent
Species and content are with 7 composition of raw materials of embodiment.
The performance of 4 embodiment 14-17 of table
Embodiment 8-17, repaired after, the impaired place of resin plate with before impaired in appearance without notable difference, relative to receiving
Before damage, stretching strength retentivity can reach 70-95%.
Claims (13)
1. one kind can repairing type carbon cloth reinforced epoxy sheet material, it is characterised in that including by weight with the following group
Point：
And least one layer of carbon cloth
Firming agent A be anhydrides, one or more of the firming agent of carboxylic acidss, firming agent B is selected from anhydrides, beyond carboxylic acidss
One or more of firming agent, accelerator selected from calcium salt, zinc salt, one or more of iron salt.
2. one kind according to claim 1 can repair carbon cloth reinforced epoxy sheet material, it is characterised in that the rush
Enter agent for one or more in citric acid, stearic acid, octanoic acid, n-nonanoic acid, the calcium salt of acetic acid, zinc salt, iron salt.
3. according to claim 1 can repairing type carbon cloth reinforced epoxy sheet material, it is characterised in that described consolidates
Agent A is more than 8 or 8 anhydrides of carbon number, omega-dicarboxylic acids, one or more in multi-carboxylic acid's firming agent.
4. according to claim 3 can repairing type carbon cloth reinforced epoxy sheet material, it is characterised in that described acid
Anhydride firming agent A be phthalic anhydride, tetrabydrophthalic anhydride, hexahydrotoluene tetracarboxylic dianhydride, the one of trimellitic anhydride
Kind or multiple, carboxylic acidss firming agent A is DC11, SL-AH, one or more in tridecanyldicarboxylic acid.
5. according to claim 4 can repairing type carbon cloth reinforced epoxy sheet material, it is characterised in that described consolidates
Agent A is phthalic anhydride and SL-AH mixture, by weight 1：0.5～2.
6. according to claim 1 can repairing type carbon cloth reinforced epoxy sheet material, it is characterised in that described carbon
Fiber cloth is the braided material being formed by weaving with carbon fiber wire, including woven carbon fiber cloth, knitting carbon cloth, weaving carbon fiber
One or more in cloth, carbon fibre initial rinse fabric, carbon fiber nonwoven fabric, are one or more layers.
7. according to claim 1 can repairing type carbon cloth reinforced epoxy sheet material, it is characterised in that described consolidates
Preferably 8～15 parts of agent A, preferably 15～30 parts of firming agent B, preferably 1～3 part of accelerator.
8. according to claim 2 can repairing type carbon cloth reinforced epoxy sheet material, it is characterised in that the promotion
Agent optimization citric acid calcium, n-nonanoic acid ferrum.
9. according to claim 5 can repairing type carbon cloth reinforced epoxy sheet material, it is characterised in that the adjacent benzene
Dicarboxylic acid anhydride is preferably 1 by weight with SL-AH：0.75～1.25.
10. according to claim 1 can repairing type carbon cloth reinforced epoxy sheet material preparation method, its feature exists
In comprising the following steps：
A) epoxy resin, firming agent B, solvent are added and is stirred in reactor, precuring 0.1 is little at 50 DEG C～180 DEG C
When～obtain precuring liquid within 48 hours；
B) firming agent A, accelerator will be added in precuring liquid, and can appropriate solvent is added on demand to adjust viscosity, mixed
Close liquid；
C) use the mixed liquor of step b) to impregnate carbon cloth, dry and remove solvent；
D) by the product solidified of step c).
11. according to claim 1 can repairing type carbon cloth reinforced epoxy sheet material restorative procedure, its feature exists
In comprising the following steps：
A) repair liquid containing dihydroxylic alcohols, epoxy resin, firming agent A is applied to the impaired place of resin plate；
B) impaired place is heated to below 100 DEG C～dihydroxylic alcohols boiling point；
C) is maintained certain time until resin board surface dissolves；
D) continue to be heated to more than dihydroxylic alcohols boiling point 10 DEG C, make repair liquid volatilize.
12. according to claim 8 can repairing type carbon cloth reinforced epoxy plate restorative procedure, it is characterised in that
Described dihydroxylic alcohols be ethylene glycol, diethylene glycol, Propylene Glycol, one or more in butanediol.
13. according to claim 8 can repairing type carbon cloth reinforced epoxy plate restorative procedure, it is characterised in that
By weight >=70 parts of dihydroxylic alcohols in described repair liquid, epoxy resin, firming agent A ratio with primary resin plate formula and
Which constitutes.
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| CN110606746A (en) * | 2019-09-27 | 2019-12-24 | 长沙晟天新材料有限公司 | Skull repairing patch and preparation method thereof |
| CN112778549A (en) * | 2021-01-26 | 2021-05-11 | 武汉科技大学 | Carbon fiber reinforced thermosetting resin-based composite material and preparation method thereof |
| CN114163675A (en) * | 2021-12-22 | 2022-03-11 | 许绝电工股份有限公司 | Preparation method of surface active epoxy board |
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