CN110283424A - A kind of low-temperature setting halogen-free flame retardant epoxy resin composition and its prepreg method - Google Patents
A kind of low-temperature setting halogen-free flame retardant epoxy resin composition and its prepreg method Download PDFInfo
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- CN110283424A CN110283424A CN201910457027.6A CN201910457027A CN110283424A CN 110283424 A CN110283424 A CN 110283424A CN 201910457027 A CN201910457027 A CN 201910457027A CN 110283424 A CN110283424 A CN 110283424A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
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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
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
- C08K5/3477—Six-membered rings
- C08K5/3492—Triazines
- C08K5/34928—Salts
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2463/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/322—Ammonium phosphate
- C08K2003/323—Ammonium polyphosphate
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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
- C08K7/14—Glass
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
Abstract
The present invention relates to polymeric material fields, and in particular to a kind of prepreg method of low-temperature setting halogen-free flame retardant epoxy resin composition.It sequentially includes the following steps: and includes: epoxy resin, compound curing agent, P-N flame retardant, metal oxide or hydroxide flame retardant, solvent type diluent.Soaking technology is contained using wet process, effect of impregnation is good, the impregnation of the fabric suitable for various grammes per square metres.
Description
Technical field
The present invention relates to polymeric material fields, and in particular to a kind of low-temperature setting halogen-free flame retardant epoxy resin composition
Prepreg method.
Background technique
Fire-retardant epoxy resin prepreg is due to simple process, forming process cleaning, the low, good flame resistance of product porosity etc.
Feature is widely used in printed circuit board, vehicles interior trim and structural member.But traditional fire-retardant epoxy resin preimpregnation
Material, mostly uses greatly brominated epoxy resin and halogen containing flame-retardant, halogen although this kind of prepreg has excellent flame retardant property
Fire retardant and resin can discharge a large amount of toxic gases when burning, and bring serious harm to ecological environment and human health, in recent years
The gradually use of the halogen fire proofing of legislation limitation of Europe, the United States, Deng developed country, halogen-free fire-retardant epoxy resin prepreg is
Main way as current research and development.In addition, traditional fire-retardant epoxy resin prepreg is usually solidified with medium and high temperature
Based on technique, the metal die of use cost valuableness is needed when manufacturing multiple material part, limits prepreg in some pairs of cost control
Application in stringent field, such as automobile, rail traffic etc..It is such as able to achieve prepreg to solidify in cryogenic conditions, low cost can be used
Fiber reinforced plastic mold replace metal die to significantly reduce the manufacturing cost of composite material to improve epoxy prepreg
The market competitiveness.Therefore, research and develop a kind of halogen-free flame-retardant can the epoxy prepreg of low-temperature solid be composite material neck
Domain technical problem urgently to be resolved is worth research.
Aerospace interior trim and structural member, but at present in track transportation industry using fewer, main cause is track
Transportation industry is very big to cost control pressures, and the epoxy prepreg of common intermediate temperature setting needs injection traffic row
The problem of industry not only wants sky to make material cost itself, it is also necessary to which it is low to solve traditional glass steel workshop oven temperature, glass
The problems such as glass steel mold non-refractory.If can also continue to use biography so epoxy prepreg can solidify at low temperature
The baking oven and mold of system glass reinforced plastic workshop, greatly reduce the disposable investment of equipment, enter rail for epoxy prepreg
The pressure of road field of traffic reduction cost.It cured can be required in addition to meeting the above low temperature, also require prepreg to have fire-retardant
The characteristics such as property good, low-smoke low-toxicity, suitable normal-temperature operation.
In the above context, it is high to develop a kind of latency, low-temperature curable, the Halogenless fire retarded epoxy resin of high flame resistance
And its fiber-reinforced fabric prepreg is of great significance, and is worth research.
Summary of the invention
The present invention is intended to provide a kind of composition epoxy resin is using compounding flame retardant and compounding curing system, preimpregnation
Expect that resin impregnated technique is that wet process contains soaking technology.Epoxy prepreg of the invention has suitable normal-temperature operation phase, low temperature
Curable, solidfied material glass transition temperature is high, and flame retardant property is good, a kind of low-temperature setting Halogenless fire retarded epoxy resin of good mechanical property
The prepreg method of composition.
Particularly, inventor provides the following technical solution:
A kind of low-temperature setting halogen-free flame retardant epoxy resin composition, sequentially includes the following steps:
Include: epoxy resin, compound curing agent, P-N flame retardant, metal oxide or hydroxide flame retardant, solvent type
Diluent；
Affiliated mentioned component is formed by following parts by weight:
Epoxy resin: 100 parts；
Compound curing agent: 4-6 parts；
P-N flame retardant: 20-40 parts；
Metal oxide or hydroxide flame retardant: 5-20 parts；
Solvent type diluent: 10-30 parts；
The composition epoxy resin is the preparation method is as follows: at room temperature by epoxy resin, diluent, mixing according to the above ratio
It is even, compound curing agent is added under agitation, stirs 10-15 minutes, P-N flame retardant, gold is added under agitation
Belong to oxide or hydroxide flame retardant, stirring finally obtains epoxy resin composition in 20-30 minutes.
Preferably, the epoxy resin be bisphenol-A type epoxy resin, novolac epoxy resin, bisphenol F epoxy resin, in
One of equimolecular quantity bisphenol A epoxide resin, high molecular weight bisphenol A epoxy resin or a variety of mixtures.
Preferably, the compound curing agent be one of aginomoto curing agent PN-23J, PN-31J, PN-40J and
The mixture of one of aginomoto curing agent MY-24, MY-25, MY-H.
Preferably, the P-N flame retardant be ammonium polyphosphate, melamine cyanurate, two melamine of pyrophosphoric acid
2 kinds or 3 kinds of mixture in amine.
Preferably, the hydrogen metal oxide or hydroxide flame retardant are magnesia, aluminium oxide, antimony oxide, hydrogen
Magnesia, antimony hydroxide, aluminium hydroxide one or more of mixtures.
A kind of prepreg method of low-temperature setting halogen-free flame retardant epoxy resin composition, sequentially includes the following steps:
Prepreg is will to be made in epoxy resin composition described in fiber-reinforced fabric impregnation in claim 1, wherein in advance
The mass percent of epoxy resin composition is 20-60% in leaching material.
Preferably, the surface density of the fiber-reinforced fabric is 200-800gsm, kinds of fibers is glass fibre, carbon fiber
One of dimension, aramid fiber, basalt fibre, weave are one of plain weave, twill, satin weave.
Preferably, the resin impregnated technique is that wet process contains soaking technology.
The epoxy resin is bisphenol-A type epoxy resin in the present invention, such as: HEXION company EPIKOTE
828, Sanmu Group Co., Ltd., Jiangsu SM-128, blue star resin Co., Ltd WSR618, Ba Ling petrochemical industry E51；Middle equal part
Son amount bisphenol A epoxide resin, such as: South Asia group NPES-901；High molecular weight bisphenol A epoxy resin, such as: South Asia group
NPES-907, one of bisphenol F epoxy resin and novolac epoxy resin or a variety of mixtures；
Inventing the P-N flame retardant is ammonium polyphosphate, such as the Zhejiang rising sun gloomy halogen-free smoke resistance flame resistance agent Co., Ltd XS-APP
II, Clariant company EXOLIT AP462；Melamine cyanurate, such as the Zhejiang rising sun gloomy halogen-free smoke resistance flame resistance agent Co., Ltd
XS-MC-151, Jinan Sen Nuo new material Science and Technology Ltd. SN-304, Jinghui Chemical Inst., Hefei FCC-MC03；Pyrophosphoric acid
Two melamines, such as 2 kinds or 3 kinds of Dongguan Sheng De Chemical Co., Ltd. SDA2002.
Metal oxide or hydroxide flame retardant of the present invention are magnesia, aluminium oxide, antimony oxide, hydroxide
Magnesium, antimony hydroxide, aluminium hydroxide one or more of mixtures.Fire retardant purity is more than or equal to 99%, and average grain diameter is less than or waits
In 5 μm.
The surface density of fiber-reinforced fabric of the present invention is 200-800gsm, and kinds of fibers is glass fibre, carbon fiber,
Aramid fiber, one of basalt fibre, weave are plain weave, twill, one of satin weave.
A kind of low-temperature setting Halogenless fire retarded epoxy resin process for manufacturing prepregs of the present invention is wet impregnation technique.
Store validity period 6 months or more at -18 DEG C of above-mentioned epoxy prepreg, normal-temperature operation device 5 days or more, 60-80
Minute curing time 2-8 hour at DEG C, solidfied material glass transition temperature are higher than 100 °C, and flame retardant property can pass through rail traffic
Flame-retardant standard EN 45545 HL3 grade flame retardant test.
The medicine have the advantages that can solidify at a temperature of 60-80 DEG C, and there is very high glass transition temperature
Degree, while can ensure with 5 days normal-temperature operation phases, meet the operating time of general scheduling of production, can be adapted for glass reinforced plastic
The equipment that forms a complete production network of mold and low temperature baking oven.With good flame retardant property, halogen-free flameproof, low-smoke low-toxicity can meet rail
The peak demand of all flame-retardant standards of road traffic interior trim.Soaking technology is contained using wet process, effect of impregnation is good, suitable for various grammes per square metres
The impregnation of fabric.
Specific embodiment
The present invention is described in detail for following specific embodiment.Following embodiment will be helpful to those skilled in the art
Member further understands the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill people of this field
For member, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to of the invention
Protection scope.
Embodiment 1: weighing according to parts by weight,
828 bisphenol A epoxide resin of EPIKOTE: 100 parts
PN-23J:2 parts of aginomoto
MY-25:2 parts of aginomoto
EXOLIT AP462 ammonium polyphosphate: 20 parts
FCC-MC03 melamine cyanurate: 10 parts
Aluminium hydroxide: 10 parts
Acetone diluent: 30 parts
Fiber: twill glass fabric, surface density: 360g/m2, weave: 2*2 twill
The mass percent of resin Composition in prepreg: 38 ± 3%
The liquid epoxy resin composition preparation method is as follows, at room temperature by 828 bisphenol A epoxide resin of EPIKOTE, acetone
Mixed dissolution is complete according to the above ratio, under agitation addition aginomoto PN-23J curing agent, aginomoto MY-25 curing agent,
EXOLIT AP462 ammonium polyphosphate, FCC-MC03 melamine cyanurate is added in stirring 10-15 minutes under agitation
Salt, aluminium hydroxide, which stir 20-30 minutes, finally obtains epoxy resin composition.
For the epoxy prepreg the preparation method is as follows: selecting the above compounding epoxy resin, fiber selects twill glass
Fabric, the mass percent of resin Composition in prepreg: 38 ± 3%, VC :≤1%.
80 DEG C of above-mentioned composition epoxy resin solidifications, 240 minutes front and back the key technical indexes are as follows:
It is tested by DSC, 119.6 DEG C of initial curing temperature, 133.8 DEG C of peak temperature, curing exotherm 246.1J/g.Resin 120
Gel time 227s at DEG C.It is tested by DMA, 104.8 DEG C of glass transition temperature.
The key technical indexes is as follows after above-mentioned 80 DEG C of epoxy resin glass prepreg solidifications 240 minutes:
By EN45545 flame retardant test, test result is as follows table:
Measuring mechanical property result is as follows:
| Project | 1 test result of example |
| Tensile strength | 495MPa |
| Stretch modulus | 25200MPa |
| Bending strength | 566MPa |
| Bending modulus | 26200Mpa |
Embodiment 2: weighing according to parts by weight,
828 bisphenol A epoxide resin of EPIKOTE: 80 parts
NPES-901 intermediate molecular weight bisphenol A epoxide resin: 20 parts
PN-31J:2 parts of aginomoto
MY-24:3 parts of aginomoto
EXOLIT AP462 ammonium polyphosphate: 20 parts
FCC-MC03 melamine cyanurate: 15 parts
Magnesium hydroxide: 5 parts
Acetone diluent: 30 parts
Fiber: twill glass fabric, surface density: 360g/m2, weave: 2*2 twill
The mass percent of resin Composition in prepreg: 38 ± 3%
The liquid epoxy resin composition preparation method is as follows, at room temperature by 828 bisphenol A epoxide resin of EPIKOTE, NPES-
Mixed dissolution is complete according to the above ratio for 901 intermediate molecular weight bisphenol A epoxide resins, acetone, and aginomoto is added under agitation
PN-31J curing agent, aginomoto MY-24 curing agent stir 10-15 minutes, EXOLIT AP462 poly are added under agitation
Ammonium phosphate, FCC-MC03 melamine cyanurate, magnesium hydroxide, which stir 20-30 minutes, finally obtains epoxy resin composition.
For the epoxy prepreg the preparation method is as follows: selecting the above compounding epoxy resin, fiber selects twill glass
Fabric, the mass percent of resin Composition in prepreg: 38 ± 3%, VC :≤1%.
80 DEG C of above-mentioned composition epoxy resin solidifications, 240 minutes front and back the key technical indexes are as follows:
It is tested by DSC, 115.6 DEG C of initial curing temperature, 130.2 DEG C of peak temperature, curing exotherm 226.6J/g.Resin 120
Gel time 207s at DEG C.It is tested by DMA, 109.2 DEG C of glass transition temperature.
The key technical indexes is as follows after above-mentioned 80 DEG C of epoxy resin glass prepreg solidifications 240 minutes:
By EN45545 flame retardant test, test result is as follows table:
Measuring mechanical property result is as follows:
| Project | 2 test result of example |
| Tensile strength | 516MPa |
| Stretch modulus | 24350MPa |
| Bending strength | 586MPa |
| Bending modulus | 28700Mpa |
828 bisphenol A epoxide resin of embodiment 3:EPIKOTE: 95 parts
NPES-907 high molecular weight bisphenol A epoxy resin: 5 parts
PN-31J:1 parts
MY-H:5 parts
EXOLIT AP462 ammonium polyphosphate: 15 parts
FCC-MC03 melamine cyanurate: 20 parts
Aluminium oxide: 5 parts
Acetone diluent: 30 parts
Fiber: twill glass fabric, surface density: 360g/m2, weave: 2*2 twill
The mass percent of resin Composition in prepreg: 38 ± 3%
The liquid epoxy resin composition preparation method is as follows, at room temperature by 828 bisphenol A epoxide resin of EPIKOTE, NPES-
907 high molecular weight bisphenol A epoxy resin, acetone are uniformly mixed according to the above ratio, and aginomoto PN-31J is added under agitation
Curing agent, aginomoto MY-H curing agent, stir 10-15 minute, under agitation addition EXOLIT AP462 ammonium polyphosphate,
FCC-MC03 melamine cyanurate, aluminium oxide, which stir 20-30 minutes, finally obtains epoxy resin composition.
For the epoxy prepreg the preparation method is as follows: selecting the above compounding epoxy resin, fiber selects twill glass
Fabric, the mass percent of resin Composition in prepreg: 38 ± 3%, VC :≤1%.
80 DEG C of above-mentioned composition epoxy resin solidifications, 240 minutes front and back the key technical indexes are as follows:
It is tested by DSC, 123.6 DEG C of initial curing temperature, 135.2 DEG C of peak temperature, curing exotherm 222.2J/g.Resin 120
Gel time 231s at DEG C.It is tested by DMA, 102.1 DEG C of glass transition temperature.
The key technical indexes is as follows after above-mentioned 80 DEG C of epoxy resin glass prepreg solidifications 240 minutes:
By EN45545 flame retardant test, test result is as follows table:
Measuring mechanical property result is as follows:
Claims (8)
1. a kind of low-temperature setting halogen-free flame retardant epoxy resin composition, it is characterised in that sequentially include the following steps:
Include: epoxy resin, compound curing agent, P-N flame retardant, metal oxide or hydroxide flame retardant, solvent type
Diluent；
Affiliated mentioned component is formed by following parts by weight:
Epoxy resin: 100 parts；
Compound curing agent: 4-6 parts；
P-N flame retardant: 20-40 parts；
Metal oxide or hydroxide flame retardant: 5-20 parts；
Solvent type diluent: 10-30 parts；
The composition epoxy resin is the preparation method is as follows: at room temperature by epoxy resin, diluent, mixing according to the above ratio
It is even, compound curing agent is added under agitation, stirs 10-15 minutes, P-N flame retardant, gold is added under agitation
Belong to oxide or hydroxide flame retardant, stirring finally obtains epoxy resin composition in 20-30 minutes.
2. a kind of low-temperature setting halogen-free flame retardant epoxy resin composition according to claim 1, it is characterised in that: the ring
Oxygen resin be bisphenol-A type epoxy resin, novolac epoxy resin, bisphenol F epoxy resin, intermediate molecular weight bisphenol A epoxide resin,
One of high molecular weight bisphenol A epoxy resin or a variety of mixtures.
3. a kind of low-temperature setting halogen-free flame retardant epoxy resin composition according to claim 1, it is characterised in that: described multiple
Mould assembly curing agent is one of aginomoto curing agent PN-23J, PN-31J, PN-40J and aginomoto curing agent MY-24, MY-
25, the mixture of one of MY-H.
4. a kind of low-temperature setting halogen-free flame retardant epoxy resin composition according to claim 1, it is characterised in that: the P-
N flame retardant be ammonium polyphosphate, 2 kinds or 3 kinds of mixture in melamine cyanurate, two melamine of pyrophosphoric acid.
5. a kind of low-temperature setting halogen-free flame retardant epoxy resin composition according to claim 1, it is characterised in that: described
Hydrogen metal oxide or hydroxide flame retardant are magnesia, aluminium oxide, antimony oxide, magnesium hydroxide, antimony hydroxide, aluminium hydroxide
One or more of mixtures.
6. a kind of prepreg method of low-temperature setting halogen-free flame retardant epoxy resin composition according to claim 1, special
Sign is to sequentially include the following steps:
Prepreg is will to be made in epoxy resin composition described in fiber-reinforced fabric impregnation in claim 1, wherein in advance
The mass percent of epoxy resin composition is 20-60% in leaching material.
7. a kind of prepreg method of low-temperature setting halogen-free flame retardant epoxy resin composition according to claim 6, special
Sign is: the surface density of the fiber-reinforced fabric is 200-800gsm, and kinds of fibers is glass fibre, carbon fiber, aramid fiber fibre
One of dimension, basalt fibre, weave are one of plain weave, twill, satin weave.
8. a kind of prepreg method of low-temperature setting halogen-free flame retardant epoxy resin composition according to claim 6, special
Sign is: the resin impregnated technique is that wet process contains soaking technology.
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| CN115490914A (en) * | 2022-08-18 | 2022-12-20 | 南昌航空大学 | Method for preparing phosphate flame retardant from epoxy resin recovered from phosphoric acid |
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| CN110894341A (en) * | 2019-10-18 | 2020-03-20 | 成都鲁晨新材料科技有限公司 | Halogen-free flame-retardant epoxy prepreg and composite material thereof |
| CN110774674A (en) * | 2019-11-11 | 2020-02-11 | 江苏恒神股份有限公司 | Fiber-reinforced resin-based prepreg and preparation method thereof |
| CN111995842A (en) * | 2020-08-25 | 2020-11-27 | 华北科技学院 | Solid super acid, preparation method thereof and flame-retardant epoxy resin |
| CN111995842B (en) * | 2020-08-25 | 2023-04-25 | 华北科技学院 | Solid super acid, preparation method thereof and flame-retardant epoxy resin |
| CN112126196A (en) * | 2020-09-28 | 2020-12-25 | 深圳市郎搏万先进材料有限公司 | Intermediate-temperature fast-curing flame-retardant epoxy resin composition and flame-retardant prepreg |
| CN112143174A (en) * | 2020-09-28 | 2020-12-29 | 深圳市郎搏万先进材料有限公司 | Low-temperature-cured normal-temperature-stored flame-retardant epoxy resin composition and flame-retardant prepreg |
| CN114274640A (en) * | 2021-12-28 | 2022-04-05 | 浙江百合航太复合材料有限公司 | Rapid-curing high-flame-retardant mica prepreg, mica plate and preparation method thereof |
| CN115490914A (en) * | 2022-08-18 | 2022-12-20 | 南昌航空大学 | Method for preparing phosphate flame retardant from epoxy resin recovered from phosphoric acid |
| CN115490914B (en) * | 2022-08-18 | 2024-04-09 | 南昌航空大学 | Method for preparing phosphate flame retardant by recycling epoxy resin from phosphoric acid |
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