CN105086376B - A kind of carbon fiber/epoxy resin composite material and preparation method thereof - Google Patents

A kind of carbon fiber/epoxy resin composite material and preparation method thereof Download PDF

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CN105086376B
CN105086376B CN201510514963.8A CN201510514963A CN105086376B CN 105086376 B CN105086376 B CN 105086376B CN 201510514963 A CN201510514963 A CN 201510514963A CN 105086376 B CN105086376 B CN 105086376B
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epoxy resin
carbon fiber
parts
carbon
base
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CN105086376A (en
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徐蕤
熊建民
洪丽
陈大华
秦玉林
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Wuhu male lion Automobile Technology Co., Ltd.
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WUHU RESEARCH INSTITUTE OF INSTITUTE TECHNOLOGY OF AUTOMOBILE Co Ltd
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Abstract

The invention discloses a kind of carbon fiber/epoxy resin composite material and preparation method thereof, belong to field of compound material.The composite is prepared by the way that epoxy resin-base material is infiltrated into carbon fibre fabric, and after being solidified, and wherein epoxy resin-base material includes the component of following parts by weight:100 parts of epoxy resin, 10 30 parts of fluid silicone rubber, 10 35 parts of epoxy resin diluent, 20 35 parts of epoxy curing agent.Compatibility is good between carbon fiber/epoxy resin composite material each component provided in an embodiment of the present invention, and mechanical property is good, and impact flexibility is up to 205kJ/m2, at least 43% is improved than common carbon fibers/epoxy resin composite material.

Description

A kind of carbon fiber/epoxy resin composite material and preparation method thereof
Technical field
The present invention relates to field of compound material, more particularly to a kind of carbon fiber/epoxy resin composite material and its preparation side Method.
Background technology
Carbon fiber/epoxy resin composite material is that a class is compound using epoxy resin as matrix, by reinforcement of carbon fiber Material, with the superior function such as high specific strength, high ratio modulus, high temperature resistant, corrosion-resistant, antifatigue, is widely used in space flight, vapour The fields such as car, electronics, sports goods and medicine equipment.However, due to after epoxy resin cure matter it is crisp, impact flexibility, bending resistance Intensity difference, when its load or because defect produce micro-crack when easily spread rapidly make the carbon fiber/epoxy resin composite wood Material failure.It is therefore desirable to carry out toughness reinforcing processing to it to improve its impact flexibility.Therefore, it is necessary to provide a kind of carbon fiber/ring Epoxy resin composite material and preparation method.
Prior art generally uses artificial rubber, and toughness reinforcing processing is carried out to carbon fiber/epoxy resin composite material, including: Artificial rubber is configured to solution, solvent is removed after being well mixed with epoxy resin, curing agent, accelerator, is prepared into asphalt mixtures modified by epoxy resin Adipose membrane, then melt impregnation is carried out with carbon fiber, final curing obtains carbon fiber/epoxy resin composite material.
Inventor has found that prior art at least has problems with:
The artificial rubber that prior art is provided is poor with epoxy resin compatibility, easily causes carbon fiber/epoxy resin composite wood The mechanical properties decrease of material.
The content of the invention
Embodiment of the present invention technical problem to be solved is that there is provided compatibility between a kind of good toughness, each component is good Carbon fiber/epoxy resin composite material and preparation method.Concrete technical scheme is as follows:
On the one hand, the embodiments of the invention provide a kind of carbon fiber/epoxy resin composite material, by by epoxy resin-matrix Body material is infiltrated into carbon fibre fabric, and is prepared after being solidified, wherein, the epoxy resin-base material include with The component of lower parts by weight:100 parts of epoxy resin, 10-30 parts of fluid silicone rubber, 10-35 parts of epoxy resin diluent, epoxy resin 20-35 parts of curing agent.
Specifically, preferably, the epoxy resin is selected from bisphenol A type epoxy resin, bisphenol f type epoxy resin, bisphenol S Any one in type epoxy resin.
Specifically, preferably, the viscosity of the epoxy resin is 2200-5500mPas;The fluid silicone rubber Viscosity is 1500-3500mPas.
Specifically, preferably, the epoxy resin diluent shrinks selected from butyl glycidyl ether, BDO two Any one in glycerin ether, phenyl glycidyl ether, polypropylene glycol diglycidyl ether.
Specifically, preferably, the fluid silicone rubber is selected from terminal hydroxy group liquid nitrile rubber, end carboxyl liquid butyronitrile rubber Any one in glue, end carboxyl liquid polybutadiene, terminal hydroxy group liquid polybutadiene.
Specifically, preferably, the epoxy curing agent is selected from diethylenetriamine, triethylene tetramine, isophthalic diformazan Any one in amine.
Specifically, preferably, the carbon fibre fabric is twill carbon cloth.
On the other hand, the embodiments of the invention provide a kind of preparation method of above-mentioned carbon fiber/epoxy resin composite material, Including:Epoxy resin, fluid silicone rubber, epoxy resin diluent are mixed and stirred for uniformly, then to add epoxy resin cure Agent continues to stir, and obtains epoxy resin-base material;
The epoxy resin-base material is infiltrated into carbon fibre fabric by vacuum bag pressure method, then solidified, Obtain carbon fiber/epoxy resin composite material.
Specifically, preferably, controlling the epoxy resin, the fluid silicone rubber, the epoxy resin diluent to mix Viscosity after conjunction is 720-760mPas.
Specifically, preferably, the solidification includes:It is 75-85 DEG C, 115-125 DEG C, 145- to control solidification temperature successively 155 DEG C, accordingly, control solidification time is 0.8-1.2h, 1.8-2.2h, 1.8-2.2h successively.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is:
Carbon fiber/epoxy resin composite material provided in an embodiment of the present invention, by adding into epoxy resin-base material Plus fluid silicone rubber, as toughener, its viscosity is low, good with epoxy resin compatibility, beneficial to forming homogeneous mixed system. Under the complex role of above-mentioned each component, the mechanical property of prepared carbon fiber/epoxy resin composite material is significantly improved, Especially its impact flexibility is up to 205kJ/m2, at least 43% is improved than common carbon fibers/epoxy resin composite material.
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, embodiment of the present invention will be made below into One step it is described in detail.
On the one hand, the embodiments of the invention provide a kind of carbon fiber/epoxy resin composite material, by by epoxy resin-matrix Body material is infiltrated into carbon fibre fabric, and is prepared after being solidified, wherein, epoxy resin-base material includes following heavy Measure the component of part:100 parts of epoxy resin, 10-30 parts of fluid silicone rubber, 10-35 parts of epoxy resin diluent, epoxy resin cure 20-35 parts of agent.
Carbon fiber/epoxy resin composite material provided in an embodiment of the present invention, by adding into epoxy resin-base material Plus fluid silicone rubber, as toughener, its viscosity is low, good with epoxy resin compatibility, beneficial to forming homogeneous mixed system. Under the complex role of above-mentioned each component, the mechanical property of prepared carbon fiber/epoxy resin composite material is significantly improved, Especially its impact flexibility is up to 205kJ/m2, at least 43% is improved than common carbon fibers/epoxy resin composite material.
Wherein, epoxy resin is in bisphenol A type epoxy resin, bisphenol f type epoxy resin, bisphenol-s epoxy resin Any one.It is preferred that bisphenol A type epoxy resin (i.e. bisphenol A diglycidyl ether), to improve prepared carbon fiber/asphalt mixtures modified by epoxy resin The transparency and mechanical property of resin composite material.
Carbon fiber/epoxy resin composite material described in the embodiment of the present invention, refer to by matrix of epoxy resin, carbon it is fine Tie up the composite for reinforcement.The tridimensional network formed after cross linking of epoxy resin solidification has the characteristics of matter is crisp, when It loads or easily being spread rapidly when defect produces micro-crack and the carbon fiber/epoxy resin composite material is failed.And Carbon fiber has the excellent properties such as density is low, modulus is high, intensity is high, high temperature resistant, and epoxy resin-base material is infiltrated into fine to carbon In dimensional fabric, obtained carbon fiber/epoxy resin composite material has the advantage of epoxy resin and carbon fiber concurrently, but its toughness is simultaneously Do not improved.Therefore, in the case where not influenceing other mechanical properties of carbon fiber/epoxy resin composite material, in order to drop Its low fragility, increases its toughness, so as to improve its bearing strength, the embodiment of the present invention is made by adding fluid silicone rubber thereto Toughness reinforcing processing is carried out to it for toughener.
The embodiment of the present invention is using fluid silicone rubber as toughener, and its viscosity is low, has good phase with epoxy resin Capacitive, so as to form homogeneous mixed system, other mechanical property without reducing carbon fiber/epoxy resin composite material Energy.Specifically, the viscosity of epoxy resin is 2200-5500mPas, and the viscosity of fluid silicone rubber is 1500-3500mPas. For example, fluid silicone rubber is selected from terminal hydroxy group liquid nitrile rubber, end carboxyl liquid nitrile rubber, end carboxyl liquid polybutadiene Any one in alkene, terminal hydroxy group liquid polybutadiene.Epoxy resin is carried out by using the fluid silicone rubber of the above-mentioned type It is modified, the toughness of prepared carbon fiber/epoxy resin composite material can be effectively improved.
During carbon fiber/epoxy resin composite material is prepared, the embodiment of the present invention is dilute by adding epoxy resin Agent is released, the viscosity of epoxy resin-base material is reduced to 720-760mPas, so as to increase epoxy resin and fluid silicone rubber Mobility, make reaction between the two more abundant.Preferably, epoxy resin diluent be selected from butyl glycidyl ether, Any one in 1,4- butanediol diglycidyl ethers, phenyl glycidyl ether, polypropylene glycol diglycidyl ether.It is Response type epoxy resin diluent, i.e. reactive epoxies diluent, due to containing epoxide group in its strand, can with it is each Plant epoxy curing agent and carry out cross-linking reaction, form network structure.Wherein, ring is contained in one end of butyl glycidyl ether molecule Oxygen groups, its dilution effect is best;Epoxide group is contained at the two ends of BDDE molecule, its pliability Preferably;Epoxide group is contained in one end of phenyl glycidyl ether molecule, and its heatproof is preferable;Polypropylene glycol diglycidyl ether molecule Two ends contain epoxide group, its pliability is preferable.
Specifically, epoxy curing agent is any one in diethylenetriamine, triethylene tetramine, m-xylene diamine Kind.It is amine curing agent, in cured condition, and epoxide group is opened by active hydrogen on its nitrogen-atoms, and be allowed to Epoxy resin crosslinks reaction, forms netted space polymers, the epoxy resin of line style is changed into tough and tensile build solid.
Preferably, carbon fibre fabric provided in an embodiment of the present invention can be plain weave, twill, satin weave, unidirectional carbon Cloth, preferably twill carbon cloth, it has stronger shearing force, so that tensile capacity is stronger.Carbon cloth is a kind of Unidirectional Fiber reinforced product, itself has good tensile strength, and it, which is impregnated, by epoxy resin-base material can reach and make ring Oxygen tree fat tension, shearing resistance, the effect of seismic hardening.Further, carbon fibre fabric provided in an embodiment of the present invention can be used 1K, 3K, 6K, 12K, 24K and the above specification, it is to be understood that 1K, which is represented, has 1000 monofilament carbon fine in a branch of carbon fiber Dimension, the like.The carbon fibre fabric that the embodiment of the present invention is used is preferably 3K twill carbon cloths, and it has intensity height, ring The good advantage of epoxy resin-based body material effect of impregnation.
On the other hand, the embodiments of the invention provide a kind of preparation method of above-mentioned carbon fiber/epoxy resin composite material, Including:Epoxy resin, fluid silicone rubber, epoxy resin diluent are mixed and stirred for uniformly, then to add epoxy resin cure Agent continues after stirring, and obtains epoxy resin-base material;By vacuum bag pressure method by epoxy resin-base material infiltrate to In carbon fibre fabric, then solidified, obtained carbon fiber/epoxy resin composite material.
Preferably, the embodiments of the invention provide a kind of system of more specifically carbon fiber/epoxy resin composite material Preparation Method, including:
1) epoxy resin, fluid silicone rubber, epoxy resin diluent, are mixed and stirred for 1-3h, preferably 2h, treat that it is formed After homogeneous mixed system, add epoxy curing agent and continue the 1-3h that stirs, preferably 2h, form epoxy resin-base material Material.
2), carbon fibre fabric is trimmed, laying and sizing, cover release cloth, flow-guiding screen, auxiliary on its surface successively Mozzle, vacuum bag, are sealed with fluid sealant, and vacuum pumping is carried out to vacuum bag, to the close -0.1Mpa of internal pressure.
3) epoxy resin-base material, is injected by auxiliary draft tube, its consumption is 1L epoxy resin-bases material/often put down Square rice carbon fibre fabric, to realize its complete wetting to carbon fibre fabric, after infiltration 4-8h, obtain uncured carbon fiber/ Epoxy resin composite material.
4), uncured carbon fiber/epoxy resin composite material is solidified, it is 75-85 that solidification temperature is controlled successively DEG C, 115-125 DEG C, 145-155 DEG C, preferably 80 DEG C, 120 DEG C, 150 DEG C, accordingly, successively control solidification time be 0.8- 1.2h, 1.8-2.2h, 1.8-2.2h, preferably 1h, 2h, 2h, carry out demoulding processing, obtain carbon fiber/epoxy resin composite wood Material.
The vacuum bag pressure method that the embodiment of the present invention is used is state of the art, and it has the throwing for saving mould and equipment The advantage of money.Wherein, release cloth is used to aid in the separation of carbon fiber/epoxy resin composite material, so as to get product quality more It is good.Flow-guiding screen is easy to passing through for epoxy resin-base material due to its stereochemical structure, to realize to the more preferable leaching of carbon fibre fabric Profit.Fluid sealant is used between mould and vacuum bag, vacuum bag is reached the effect being fully sealed.
Further, method provided in an embodiment of the present invention also includes:The carbon fiber/epoxy resin prepared is combined Material is trimmed, polished and excision forming, in order to obtain the composite of intended shape.
The present invention will be further described through by specific embodiment below.
In specific examples below, the unreceipted condition person of involved operation, according to normal condition or manufacturer It is recommended that condition carry out.Raw materials used unreceipted production firm and specification person are can be by the conventional products of acquisition purchased in market. Part material information involved by following examples is as follows:
Bisphenol A type epoxy resin, model SM609 (E-03), purchased from Sanmu Group Co., Ltd., Jiangsu;
Bisphenol f type epoxy resin, model EPCN-170, purchased from Hunan Tuo Suo Science and Technology Ltd.s;
Bisphenol-s epoxy resin, purchased from Chongqing Yong Hua Chemical Groups Co., Ltd;
3K twill carbon cloths, purchased from Dalian Xingke Carbon Fiber Co., Ltd.
In addition, according to prepared by being determined " GBT1451-2005 fibre reinforced plastics freely-supported beam type impact ductility tests method " Carbon fiber/epoxy resin composite material impact flexibility.
Embodiment 1
A kind of carbon fiber/epoxy resin composite material, including 3K twill carbon cloths are present embodiments provided, and is full of The epoxy resin-base material in the space of 3K twill carbon cloths.Wherein, epoxy resin-base material includes following parts by weight Component:100 parts of bisphenol-s epoxy resin, its viscosity is 4210mPas;14 parts of terminal hydroxy group liquid nitrile rubber, its viscosity is 2300mPa·s;25 parts of butyl glycidyl ether;20 parts of diethylenetriamine.
The preparation method of the composite is as follows:
1), above-mentioned bisphenol-s epoxy resin, terminal hydroxy group liquid nitrile rubber, butyl glycidyl ether are mixed and stirred for 2h, after homogeneous mixed system is formed after it, adds diethylenetriamine and continues to stir 2h, form epoxy resin-base material.
2), 3K twill carbon cloths are trimmed, laying and sizing, covered successively on its surface release cloth, flow-guiding screen, Auxiliary draft tube, vacuum bag, are sealed with fluid sealant, to vacuum bag carry out vacuum pumping, to internal pressure close to- 0.1Mpa。
3) epoxy resin-base material, is injected by auxiliary draft tube, its consumption is 1L epoxy resin-bases material/often put down Square rice carbon fibre fabric, to realize after its complete wetting to 3K twill carbon cloths, infiltration 4h, obtains uncured carbon fine Dimension/epoxy resin composite material.
4), uncured carbon fiber/epoxy resin composite material is solidified, control successively solidification temperature for 75 DEG C, 115 DEG C, 145 DEG C, accordingly, control solidification time is 1.2h, 2.2h, 2.2h successively.Then the demoulding handle, obtain carbon fiber/ Epoxy resin composite material.
Embodiment 2
A kind of carbon fiber/epoxy resin composite material, including 3K twill carbon cloths are present embodiments provided, and is full of The epoxy resin-base material in the space of 3K twill carbon cloths.Wherein, epoxy resin-base material includes following parts by weight Component:100 parts of bisphenol A type epoxy resin, its viscosity is 5400mPas;20 parts of terminal hydroxy group liquid polybutadiene, its viscosity is 1800mPa·s;35 parts of polypropylene glycol diglycidyl ether;24 parts of m-xylene diamine.
The preparation method of the composite is as follows:
1), above-mentioned bisphenol A type epoxy resin, terminal hydroxy group liquid polybutadiene, polypropylene glycol diglycidyl ether are mixed And 2h is stirred, after homogeneous mixed system is formed after it, add m-xylene diamine and continue to stir 2h, form epoxy resin-base material Material.
2), 3K twill carbon cloths are trimmed, laying and sizing, covered successively on its surface release cloth, flow-guiding screen, Auxiliary draft tube, vacuum bag, are sealed with fluid sealant, to vacuum bag carry out vacuum pumping, to internal pressure close to- 0.1Mpa。
3) epoxy resin-base material, is injected by auxiliary draft tube, its consumption is 1L epoxy resin-bases material/often put down Square rice carbon fibre fabric, to realize after its complete wetting to 3K twill carbon cloths, infiltration 5h, obtains uncured carbon fine Dimension/epoxy resin composite material.
4), uncured carbon fiber/epoxy resin composite material is solidified, control successively solidification temperature for 78 DEG C, 118 DEG C, 148 DEG C, accordingly, control solidification time is 1.1h, 2.1h, 2.1h successively.Then the demoulding handle, obtain carbon fiber/ Epoxy resin composite material.
Embodiment 3
A kind of carbon fiber/epoxy resin composite material, including 3K twill carbon cloths are present embodiments provided, and is full of The epoxy resin-base material in the space of 3K twill carbon cloths.Wherein, epoxy resin-base material includes following parts by weight Component:100 parts of bisphenol f type epoxy resin, its viscosity is 2400mPas;15 parts of end carboxyl liquid nitrile rubber, its viscosity is 2600mPa·s;12 parts of 1,4- butanediol diglycidyl ethers;28 parts of triethylene tetramine.
The preparation method of the composite is as follows:
1), above-mentioned bisphenol f type epoxy resin, end carboxyl liquid nitrile rubber, 1,4- butanediol diglycidyl ethers are mixed Merge stirring 2h, after homogeneous mixed system is formed after it, add triethylene tetramine and continue to stir 2h, form epoxy resin-base Material.
2), 3K twill carbon cloths are trimmed, laying and sizing, covered successively on its surface release cloth, flow-guiding screen, Auxiliary draft tube, vacuum bag, are sealed with fluid sealant, to vacuum bag carry out vacuum pumping, to internal pressure close to- 0.1Mpa。
3) epoxy resin-base material, is injected by auxiliary draft tube, its consumption is 1L epoxy resin-bases material/often put down Square rice carbon fibre fabric, to realize after its complete wetting to 3K twill carbon cloths, infiltration 6h, obtains uncured carbon fine Dimension/epoxy resin composite material.
4), uncured carbon fiber/epoxy resin composite material is solidified, control successively solidification temperature for 85 DEG C, 125 DEG C, 150 DEG C, accordingly, control solidification time is 0.8h, 1.8h, 1.8h successively.Then the demoulding handle, obtain carbon fiber/ Epoxy resin composite material.
Embodiment 4
A kind of carbon fiber/epoxy resin composite material, including 3K twill carbon cloths are present embodiments provided, and is full of The epoxy resin-base material in the space of 3K twill carbon cloths.Wherein, epoxy resin-base material includes following parts by weight Component:100 parts of bisphenol A type epoxy resin, its viscosity is 5400mPas;25 parts of end carboxyl liquid polybutadiene, its viscosity is 2100mPa·s;35 parts of phenyl glycidyl ether;20 parts of m-xylene diamine.
The preparation method of the composite is as follows:
1), above-mentioned bisphenol A type epoxy resin, end carboxyl liquid polybutadiene, phenyl glycidyl ether are mixed and stirred for 2h, after homogeneous mixed system is formed after it, adds m-xylene diamine and continues to stir 2h, form epoxy resin-base material.
2), 3K twill carbon cloths are trimmed, laying and sizing, covered successively on its surface release cloth, flow-guiding screen, Auxiliary draft tube, vacuum bag, are sealed with fluid sealant, to vacuum bag carry out vacuum pumping, to internal pressure close to- 0.1Mpa。
3) epoxy resin-base material, is injected by auxiliary draft tube, its consumption is 1L epoxy resin-bases material/often put down Square rice carbon fibre fabric, to realize after its complete wetting to 3K twill carbon cloths, infiltration 8h, obtains uncured carbon fine Dimension/epoxy resin composite material.
4), uncured carbon fiber/epoxy resin composite material is solidified, control successively solidification temperature for 80 DEG C, 120 DEG C, 150 DEG C, accordingly, control solidification time is 1h, 2h, 2h successively.Then the demoulding is handled, and obtains carbon fiber/asphalt mixtures modified by epoxy resin Resin composite material.
Comparative example 1
A kind of carbon fiber/epoxy resin composite material used and compared is present embodiments provided, except not containing end wherein Hydroxyl liquid nitrile rubber, it is remaining composition, same as Example 1 with when preparation method.
Comparative example 2
A kind of carbon fiber/epoxy resin composite material used and compared is present embodiments provided, except not containing end wherein Hydroxyl liquid polybutadiene, it is remaining composition, same as Example 2 with when preparation method.
Comparative example 3
A kind of carbon fiber/epoxy resin composite material used and compared is present embodiments provided, except not containing end wherein Carboxyl liquid nitrile rubber, it is remaining composition, same as Example 3 with when preparation method.
Comparative example 4
A kind of carbon fiber/epoxy resin composite material used and compared is present embodiments provided, except not containing end wherein Carboxyl liquid polybutadiene, it is remaining composition, same as Example 4 with when preparation method.
Embodiment 5
The present embodiment is to the carbon fiber/epoxy resin composite material that is prepared in embodiment 1-4 and comparative example 1-4 Impact flexibility is tested, as a result as shown in table 1:
Table 1
Embodiment Impact flexibility (KJ/m2)
Embodiment 1 189.2
Comparative example 1 132.0
Embodiment 2 166.8
Comparative example 2 116.8
Embodiment 3 174.5
Comparative example 3 122.0
Embodiment 4 205.4
Comparative example 4 137.8
Presently preferred embodiments of the present invention is the foregoing is only, the protection domain being not intended to limit the invention is all in this hair Within bright spirit and principle, any modifications, equivalent substitutions and improvements made etc. should be included in protection scope of the present invention Within.

Claims (4)

1. a kind of carbon fiber/epoxy resin composite material, by the way that epoxy resin-base material is infiltrated into carbon fibre fabric, and Prepared after being solidified, it is characterised in that the epoxy resin-base material includes the component of following parts by weight:Bisphenol-A 100 parts of type epoxy resin, 25 parts of end carboxyl liquid polybutadiene, 35 parts of epoxy resin diluent, 20 parts of epoxy curing agent;
The viscosity of the epoxy resin is 5400mPas;The viscosity of the end carboxyl liquid polybutadiene is 2100Pas;
The epoxy resin diluent is phenyl glycidyl ether;The epoxy curing agent is m-xylene diamine;
The carbon fibre fabric is twill carbon cloth.
2. the preparation method of the carbon fiber/epoxy resin composite material described in claim 1, including:By epoxy resin, end carboxyl Liquid polybutadiene, epoxy resin diluent are mixed and stirred for uniformly, are then added epoxy curing agent and are continued to stir, Obtain epoxy resin-base material;
The epoxy resin-base material is infiltrated into carbon fibre fabric by vacuum bag pressure method, is then solidified, obtained Carbon fiber/epoxy resin composite material.
3. method according to claim 2, it is characterised in that the control epoxy resin, the poly- fourth of end carboxyl liquid Diene, the mixed viscosity of the epoxy resin diluent are 720-760mPas.
4. method according to claim 2, it is characterised in that the solidification includes:It is 75-85 to control solidification temperature successively DEG C, 115-125 DEG C, 145-155 DEG C, accordingly, successively control solidification time be 0.8-1.2h, 1.8-2.2h, 1.8-2.2h.
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CN105669951A (en) * 2016-03-31 2016-06-15 武汉理工大学 High-toughness modified epoxy resin and glass-fiber-reinforced board based on resin
CN107778773A (en) * 2016-08-31 2018-03-09 中国石油化工股份有限公司 Composition epoxy resin, its preparation method and application
CN106626439A (en) * 2016-12-27 2017-05-10 长春工业大学 Preparation method of low-cost and large-tow 48K carbon fiber preimpregnated cloth and composite material thereof
CN108658129A (en) * 2018-08-02 2018-10-16 宁波高新区诠宝绶新材料科技有限公司 A kind of tungsten hexafluoride purification devices adulterating low temperature material using bismuth
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