CN108559230A - Applied to easy coloring lower shrinkage, the high fire-retardance SMC material and preparation method thereof in new energy car battery box - Google Patents
Applied to easy coloring lower shrinkage, the high fire-retardance SMC material and preparation method thereof in new energy car battery box Download PDFInfo
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- CN108559230A CN108559230A CN201810518963.9A CN201810518963A CN108559230A CN 108559230 A CN108559230 A CN 108559230A CN 201810518963 A CN201810518963 A CN 201810518963A CN 108559230 A CN108559230 A CN 108559230A
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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
- C08L63/10—Epoxy resins modified by unsaturated compounds
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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
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/06—Unsaturated polyesters
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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
- C08K2003/222—Magnesia, i.e. magnesium oxide
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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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The present invention is disclosed applied to easy coloring lower shrinkage, the high fire-retardance SMC material and preparation method thereof in new energy car battery box.In parts by weight, raw material includes：60 70 parts of unsaturated-resins, 20 40 parts of shrinking agent SBS, 12 parts of carbon black powders, 38 parts of wetting dispersing agents, 12 parts of curing agent, 46 parts of releasing agents, 13 parts of thickeners, 160 200 parts of inorganic mineral fire-retardant fillers, 10 40 parts of organic fire-resisting fillers, 50 150 parts of fibers.The invention also discloses preparation methods.The present invention is by using SBS styrene block copolymers and is used in compounding inorganic fire-retarded filler and nitrogen phosphorus flame retardant, effectively increases the coloring of SMC material and excellent low-shrinkage, while realizing high flame resistance.And inorganic fire-retarded filler and nitrogen phosphorus flame retardant compound use can also improve mechanical performance to a certain extent.
Description
Technical field
The easy coloring lower shrinkage that the present invention relates to a kind of applied in new energy car battery box, high fire-retardance SMC material and
Preparation method.
Background technology
Sheet molding compound, i.e. SMC (Sheet Molding Compounds), the country are commonly referred to as unsaturated polyester resin piece
Shape moulding compound is with unsaturated polyester resin, and low shrinkage additive, thickener, initiator, releasing agent, filler, mill base etc. first mix
Synthetic resin is pasted, and then impregnates short glass fiber rove or glass chopped mat, and in two sides polyethylene or polypropylene film
It coats " sandwich " the pattern plastics to be formed, then also needs just carry out molding use after a certain period of time by curing.SMC
Moulding process at present mainly heat pressurize under conditions of molded curing demould, obtain required product one kind close film molding it is compound
The technology of material.Compared with other materials and forming technique, SMC material product has excellent mechanical property, electric property, resistance to
Hot and chemical resistance, and its product contraction low dimensional is accurate, short molding cycle, lightweight is, it can be achieved that high fire-retardance requires
The advantages that, therefore, high-performance SMC composite materials are studied, produces and meet battery required in current new-energy automobile industry
Box, it has also become one of the important process of field of compound material research at present.
SMC traditional products mainly have the nonpolar low shrinkage additive using polystyrene PS as representative, major advantage to be
It can colour, but low-shrinkage is bad；It is added by the polarity lower shrinkage of representative of polyvinyl acetate PVAc and saturated polyester PET
Agent, major advantage are that low-shrinkage is excellent, but cannot colour；Using polymetylmethacrylate as the nonpolarity of representative
Transiens low shrinkage additive between polarity, performance are prominent between the above two, but neither.Previous is all by adding
Increasing amount inorganic fire-retarded filler realizes high flame resistance, but due to the self character of SMC material, inorganic filler is added to maximum
Flame retardant property after number cannot still meet current materials demand.
Invention content
In order to solve the problems in the prior art, the object of the present invention is to provide one kind being applied to new energy car battery box
In easy coloring lower shrinkage, high fire-retardance SMC material and preparation method thereof, obtained SMC material is compatible with extraordinary color
Property and low-shrinkage energy, while expected high flame resistance can be reached.
Technical solution：
Applied to easy coloring lower shrinkage, the high fire-retardance SMC material in new energy car battery box, in parts by weight, raw material
Including：
It is further preferred that applied to easy coloring lower shrinkage, high fire-retardance SMC material in new energy car battery box, with
Parts by weight meter, raw material include：
It is further preferred that applied to easy coloring lower shrinkage, high fire-retardance SMC material in new energy car battery box, with
Parts by weight meter, raw material include：
The present invention (is s-B-S (Styrene- using SBS styrene block copolymers
Butadiene-Styrene) three sections of copolymers, also known as thermoplasticity butadiene-styrene block copolymer or thermoplastic styrene butadiene rubber) it realizes easily
The unsaturated bond of coloring and lower shrinkage modification SMC, SBS styrene block copolymers and unsaturated-resin in SMC can occur altogether
It is poly-, and copolymerization and benzene can be also crosslinked between the styrene in SMC resin systems and linear unsaturated polyester resin oligomers
The autohemagglutination of ethylene itself, forms the cross-linked network that fetters mutually, the contraction of unsaturated system and lower shrinkage system in reduction system
Degree significantly reduces the shrinkage of SMC material, while the shrinking agent has good coloring.And by making
It is used in compounding with inorganic fire-retarded filler and nitrogen phosphorus flame retardant, a large amount of thermal energy is absorbed in high temperature big fire by inorganic fire-retarded filler
And release vapor, combustible surface temperature can be reduced and inhibit the formation of cigarette, while organic fire-resisting filler is hindered by gas phase
Combustion and condensed phase are fire-retardant, obtain the SMC material of high fire-retardance.
The unsaturated-resin is isophthalic neopentyl glycol resins or/and vinylite.
The wetting dispersing agent is BYK-9010.
The curing agent is TBPB and TBPO composite initiation systems.Wherein, the parts by weight of TBPB are 0.5-1 parts, into one
Step is 1 part, and the parts by weight of TBPO are 0.5-1 parts, are further 0.5 part.
The releasing agent is zinc stearate or calcium stearate.
The inorganic mineral fire-retardant filler uses aluminium-hydroxide powder.
The organic fire-resisting filler is nitrogen phosphorus flame retardant, can specifically select melamine cyanurate.
The glass fibre uses length for the alkali-free short glass fiber of 12.5mm or 25mm.
Easy coloring lower shrinkage, the high fire-retardance SMC materials that the present invention also provides described applied in new energy car battery box
The preparation method of material, including resin paste is prepared and sheet forming twice technique, it is specific as follows：
(1) first by unsaturated-resin, vinylite, shrinking agent SBS, carbon black powder, wetting dispersing agent, curing agent, de-
Mould agent, inorganic mineral fire-retardant filler, the mixing of organic fire-resisting filler are uniformly dispersed, and add thickener mixing and obtain resin paste；
(2) resin paste is uniformly scratched by sheet material machine on two panels polyethylene film, is then uniformly clipped in fiber
Centre makes resin paste be impregnated with fiber and mixes one by pressure roll, then excludes air through milling roller, and winding post curing obtains institute
The SMC material stated.
Advantageous effect：
The present invention is by using SBS styrene block copolymers and is used in compounding inorganic fire-retarded filler and nitrogen phosphorous flame-retardant
Agent effectively increases the coloring of SMC material and excellent low-shrinkage, while realizing high flame resistance.And it inorganic fire-retarded fills out
Material and nitrogen phosphorus flame retardant compound use can also improve mechanical performance to a certain extent.
Specific implementation mode
With reference to specific embodiment, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate the present invention
Rather than limit the scope of the invention, after having read the present invention, various equivalences of the those skilled in the art to the present invention
The modification of form falls within the application range as defined in the appended claims.
Isophthalic neopentyl glycol resins：AROPOL purchased from the production of Ya Shilan (Ashland) (China) Investment Co., LtdTM
14029 resins of MR；
Epoxy novolac vinylite：Purchased from the production of Lei Kede (Reichhold) macromolecule (Tianjin) Co., Ltd
CORROLITETMIMPACT 31376-10 resins
MA-100：Carbon black, the trade mark of Mitsubishi；
SBS：Styrene-Butadiene-Styrene Block Copolymer is limited purchased from Sinopec Group asset management
Ba Ling petrochemical industry branch company of company F-875；
TBPB：Tertiary butyl perbenzoate is purchased from the TBPB of TRIGONOX companies；
TBPO：Peroxide -2-ethyl hexanoic acid tert-butyl is purchased from the TBPO of ARKEMA companies；
Nitrogen phosphorus flame retardant can specifically select melamine cyanurate；
Mechanical strength and shrinking percentage test reference standard《GB/T 23641-2009》.
Anti-flammability tests reference standard UL 94.
Embodiment 1
A kind of easy coloring lower shrinkage, high fire-retardance SMC material applied in new energy car battery box, SMC material include
The raw material of following parts by weight, wherein：
By above-mentioned isophthalic neopentyl glycol resins, vinylite, SBS, MA-100, BYK-9010, TBPB, TBPO, tristearin
Sour zinc, aluminium-hydroxide powder and nitrogen phosphorus flame retardant are put into high shear mixers by formula ratio and are sufficiently stirred, rotating speed control
It in 1000rpm, stirs 8 minutes, puts into magnesium oxide thickener rapidly, then high-speed stirred 1 minute, i.e., fast transfer is discarded to SMC
In two storage paste slots of unit, the resin paste of 1.6mm thickness, continuous glass fibers on the upper and lower polyethylene film even application of walking
Dimension is cut into 25mm length by round cutter group, and short glass fiber is uniformly scattered in lower-layer resin and pastes over, by pressure roll, makes
Resin paste is impregnated with fiber mixes one, then excludes air through milling roller, and wrap-up is coiled into SMC volumes, ripe subsequently into 40 DEG C
Change room and carry out fast thickening, resin full penetration glass fibre is reached after 24 hours, that is, completes easy coloring lower shrinkage, high fire-retardance
The preparation of SMC material.
Compacting standard strip carries out Mechanics Performance Testing：Tensile strength 73MPa；Bending strength 155MPa；Impact strength
75KJ/㎡；Shrinking percentage 0.09%；Anti-flammability：UL, 5V-A；Appearance is good.
Embodiment 2
A kind of easy coloring lower shrinkage, high fire-retardance SMC material applied in new energy car battery box, SMC material include
The raw material of following parts by weight, wherein：
By above-mentioned isophthalic neopentyl glycol resins, vinylite, SBS, MA-100, BYK-9010, TBPB, TBPO, tristearin
Sour zinc, aluminium-hydroxide powder and nitrogen phosphorus flame retardant are put into high shear mixers by formula ratio and are sufficiently stirred, rotating speed control
It in 1000rpm, stirs 8 minutes, puts into magnesium oxide thickener rapidly, then high-speed stirred 1 minute, i.e., fast transfer is discarded to SMC
In two storage paste slots of unit, the resin paste of 1.6mm thickness, continuous glass fibers on the upper and lower polyethylene film even application of walking
Dimension is cut into 25mm length by round cutter group, and short glass fiber is uniformly scattered in lower-layer resin and pastes over, by pressure roll, makes
Resin paste is impregnated with fiber mixes one, then excludes air through milling roller, and wrap-up is coiled into SMC volumes, ripe subsequently into 40 DEG C
Change room and carry out fast thickening, resin full penetration glass fibre is reached after 24 hours, that is, completes easy coloring lower shrinkage, high fire-retardance
The preparation of SMC material.
Compacting standard strip carries out Mechanics Performance Testing：Tensile strength 68MPa；Bending strength 150MPa；Impact strength
70KJ/㎡；Shrinking percentage 0.09%；Anti-flammability：UL,5V-A；Appearance is good.
Comparative example 1
SMC material includes the raw material of following parts by weight, wherein：
By above-mentioned isophthalic neopentyl glycol resins, vinylite, PS, MA-100, BYK-9010, TBPB, TBPO, stearic acid
Zinc, aluminium-hydroxide powder and nitrogen phosphorus flame retardant are put into high shear mixers by formula ratio and are sufficiently stirred, and rotating speed control exists
1000rpm stirs 8 minutes, puts into magnesium oxide thickener rapidly, then high-speed stirred 1 minute, i.e., fast transfer is discarded to SMC machine
In two storage paste slots of group, the resin paste of 1.6mm thickness, continuous glass fibre on the upper and lower polyethylene film even application of walking
It is cut into 25mm length by round cutter group, short glass fiber is uniformly scattered in lower-layer resin and pastes over, by pressure roll, makes tree
Fat paste is impregnated with fiber mixes one, then excludes air through milling roller, and wrap-up is coiled into SMC volumes, is cured subsequently into 40 DEG C
Room carries out fast thickening, and resin full penetration glass fibre is reached after 24 hours, that is, completes easy coloring lower shrinkage, high fire-retardance
The preparation of SMC material.
Compacting standard strip carries out Mechanics Performance Testing：Tensile strength 71MPa；Bending strength 150MPa；Impact strength
70KJ/㎡；Shrinking percentage 0.11%；Anti-flammability：UL, 5V-A；Appearance is preferable.
Comparative example 2
SMC material includes the raw material of following parts by weight, wherein：
By above-mentioned isophthalic neopentyl glycol resins, vinylite, PMMA, MA-100, BYK-9010, TBPB, TBPO, tristearin
Sour zinc, aluminium-hydroxide powder and nitrogen phosphorus flame retardant are put into high shear mixers by formula ratio and are sufficiently stirred, rotating speed control
It in 1000rpm, stirs 8 minutes, puts into magnesium oxide thickener rapidly, then high-speed stirred 1 minute, i.e., fast transfer is discarded to SMC
In two storage paste slots of unit, the resin paste of 1.6mm thickness, continuous glass fibers on the upper and lower polyethylene film even application of walking
Dimension is cut into 25mm length by round cutter group, and short glass fiber is uniformly scattered in lower-layer resin and pastes over, by pressure roll, makes
Resin paste is impregnated with fiber mixes one, then excludes air through milling roller, and wrap-up is coiled into SMC volumes, ripe subsequently into 40 DEG C
Change room and carry out fast thickening, resin full penetration glass fibre is reached after 24 hours, that is, completes easy coloring lower shrinkage, high fire-retardance
The preparation of SMC material.
Compacting standard strip carries out Mechanics Performance Testing：Tensile strength 73MPa；Bending strength 155MPa；Impact strength
75KJ/㎡；Shrinking percentage 0.09%；Anti-flammability：UL, 5V-A；Appearance is poor, surface color floating.
Comparative example 3
SMC material includes the raw material of following parts by weight, wherein：
By above-mentioned isophthalic neopentyl glycol resins, vinylite, PS, MA-100, BYK-9010, TBPB, TBPO, stearic acid
Zinc, aluminium-hydroxide powder are put into high shear mixers by formula ratio and are sufficiently stirred, and rotating speed control stirs 8 points in 1000rpm
Clock, puts into rapidly magnesium oxide thickener, then high-speed stirred 1 minute, i.e. fast transfer is discarded to two storage paste slots of SMC machine group
In, the resin paste of 1.6mm thickness, continuous glass fibre pass through round cutter group on the upper and lower polyethylene film even application of walking
It is cut into 25mm length, short glass fiber is uniformly scattered in lower-layer resin and pastes over, by pressure roll, resin paste is made to be impregnated with fiber
Mixing one, then air is excluded through milling roller, wrap-up is coiled into SMC volumes, and fast thickening is carried out subsequently into 40 DEG C of curing chambers,
Reach resin full penetration glass fibre after 24 hours, that is, completes the preparation of easy coloring lower shrinkage, high fire-retardance SMC material.
Compacting standard strip carries out Mechanics Performance Testing：Tensile strength 60MPa；Bending strength 150MPa；Impact strength
60KJ/㎡；Shrinking percentage 0.10%；Anti-flammability：UL, 5V-A；Appearance is poor, there is sand holes bubble.
In SMC sheet if single inorganic combustion inhibitor aluminium-hydroxide powder number is too high, oil factor will be very high,
SMC sheet, which works it out just to will appear, is impregnated with bad phenomenon, in turn results in material property decline.When two kinds of fire retardant compoundings make
With, so that it may to avoid occurring because aluminium-hydroxide powder content is too high, and SMC sheet is made to be impregnated with bad phenomenon.
Claims (9)
1. a kind of easy coloring lower shrinkage, high fire-retardance SMC material applied in new energy car battery box, which is characterized in that with
Parts by weight meter, raw material include：
2. easy coloring lower shrinkage, the high fire-retardance SMC materials according to claim 1 applied in new energy car battery box
Material, which is characterized in that the unsaturated-resin is isophthalic neopentyl glycol resins or/and vinylite.
3. easy coloring lower shrinkage, the high fire-retardance SMC materials according to claim 1 applied in new energy car battery box
Material, which is characterized in that the wetting dispersing agent is BYK-9010.
4. easy coloring lower shrinkage, the high fire-retardance SMC materials according to claim 1 applied in new energy car battery box
Material, which is characterized in that the curing agent is TBPB and TBPO composite initiation systems.
5. easy coloring lower shrinkage, the high fire-retardance SMC materials according to claim 1 applied in new energy car battery box
Material, which is characterized in that the releasing agent is zinc stearate or calcium stearate.
6. easy coloring lower shrinkage, the high fire-retardance SMC materials according to claim 1 applied in new energy car battery box
Material, which is characterized in that the inorganic mineral fire-retardant filler is aluminium hydroxide.
7. easy coloring lower shrinkage, the high fire-retardance SMC materials according to claim 1 applied in new energy car battery box
Material, which is characterized in that the organic fire-resisting filler is nitrogen phosphorus flame retardant.
8. easy coloring lower shrinkage, the high fire-retardance SMC materials according to claim 1 applied in new energy car battery box
Material, which is characterized in that the fiber is glass fibre.
9. easy coloring lower shrinkage, the high fire-retardance SMC material according to claim 1 applied in new energy car battery box
Preparation method, which is characterized in that including：
(1) first by unsaturated-resin, vinylite, shrinking agent SBS, carbon black powder, wetting dispersing agent, curing agent, releasing agent,
Inorganic mineral fire-retardant filler, the mixing of organic fire-resisting filler are uniformly dispersed, and add thickener mixing and obtain resin paste；
(2) resin paste is uniformly scratched by sheet material machine on two panels polyethylene film, then fiber is uniformly clipped in the middle,
By pressure roll, so that resin paste is impregnated with fiber and mix one, then air is excluded through milling roller, winding post curing obtains described
SMC material.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109679298A (en) * | 2018-12-07 | 2019-04-26 | 长春一汽富晟汽车毯业有限公司 | A kind of basalt fibre battery cover and its production technology |
| CN109988404A (en) * | 2019-04-10 | 2019-07-09 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of dedicated sheet molding compound of railway tunnel protective door and preparation method thereof |
| CN110423446A (en) * | 2019-08-09 | 2019-11-08 | 常熟市众联复合材料制品有限公司 | A kind of hot-fusible high-molecular material and its preparation method and application |
| CN111560161A (en) * | 2020-06-03 | 2020-08-21 | 龙永南 | Glass fiber composite material and preparation method thereof |
| CN111892802A (en) * | 2020-07-31 | 2020-11-06 | 广东百汇达新材料有限公司 | SMC (sheet molding compound) for new energy automobile battery cover and preparation method thereof |
| CN113912980A (en) * | 2021-11-30 | 2022-01-11 | 江苏兆鋆新材料股份有限公司 | High-flame-retardance low-smoke-density low-toxicity phenolic aldehyde sheet molding compound, and preparation and application thereof |
| CN114085510A (en) * | 2021-12-30 | 2022-02-25 | 江苏兆鋆新材料股份有限公司 | SMC (sheet molding compound) material with high covering rate and high gloss and preparation method thereof |
| CN114316549A (en) * | 2022-01-26 | 2022-04-12 | 江苏兆鋆新材料股份有限公司 | High-compression-modulus SMC material and preparation method and application thereof |
| CN114395235A (en) * | 2022-01-26 | 2022-04-26 | 江苏兆鋆新材料股份有限公司 | SMC material with high permeability resistance and preparation method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109679298A (en) * | 2018-12-07 | 2019-04-26 | 长春一汽富晟汽车毯业有限公司 | A kind of basalt fibre battery cover and its production technology |
| CN109988404A (en) * | 2019-04-10 | 2019-07-09 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of dedicated sheet molding compound of railway tunnel protective door and preparation method thereof |
| CN110423446A (en) * | 2019-08-09 | 2019-11-08 | 常熟市众联复合材料制品有限公司 | A kind of hot-fusible high-molecular material and its preparation method and application |
| CN111560161A (en) * | 2020-06-03 | 2020-08-21 | 龙永南 | Glass fiber composite material and preparation method thereof |
| CN111892802A (en) * | 2020-07-31 | 2020-11-06 | 广东百汇达新材料有限公司 | SMC (sheet molding compound) for new energy automobile battery cover and preparation method thereof |
| CN111892802B (en) * | 2020-07-31 | 2022-11-29 | 广东百汇达新材料有限公司 | SMC (sheet molding compound) for new energy automobile battery cover and preparation method thereof |
| CN113912980A (en) * | 2021-11-30 | 2022-01-11 | 江苏兆鋆新材料股份有限公司 | High-flame-retardance low-smoke-density low-toxicity phenolic aldehyde sheet molding compound, and preparation and application thereof |
| CN114085510A (en) * | 2021-12-30 | 2022-02-25 | 江苏兆鋆新材料股份有限公司 | SMC (sheet molding compound) material with high covering rate and high gloss and preparation method thereof |
| CN114316549A (en) * | 2022-01-26 | 2022-04-12 | 江苏兆鋆新材料股份有限公司 | High-compression-modulus SMC material and preparation method and application thereof |
| CN114395235A (en) * | 2022-01-26 | 2022-04-26 | 江苏兆鋆新材料股份有限公司 | SMC material with high permeability resistance and preparation method thereof |
| CN114316549B (en) * | 2022-01-26 | 2024-01-26 | 江苏兆鋆新材料股份有限公司 | High-compression-modulus SMC material and preparation method and application thereof |
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Application publication date: 20180921 |