CN106317762B - A kind of fibre-reinforced plastic motor shell and its moulding process - Google Patents
A kind of fibre-reinforced plastic motor shell and its moulding process Download PDFInfo
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- CN106317762B CN106317762B CN201610659579.1A CN201610659579A CN106317762B CN 106317762 B CN106317762 B CN 106317762B CN 201610659579 A CN201610659579 A CN 201610659579A CN 106317762 B CN106317762 B CN 106317762B
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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
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
- C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
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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
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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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
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
Abstract
The present invention discloses a kind of fibre-reinforced plastic motor shell, comprises the following components in parts by weight: 40~75 parts of thermosetting resin；15~35 parts of alkali-free glass fibre；5~10 parts of lithium hydroxide；5~20 parts of wood powder；1~5 part of dispersing agent；0.5~1.5 part of pigment；0.5~3 part of release agent；2.5~8 parts of curing agent.The invention also discloses the moulding process of above-mentioned plastic motor shell, include: to be granulated: weighing thermosetting resin, alkali-free glass fibre, lithium hydroxide, wood powder, dispersing agent, pigment, release agent and the curing agent, at a temperature of 30~50 DEG C, mixing obtains uniform powdery material in 30~60 minutes, is kneaded and pelletizes subsequently into Granulation Equipments；Injection molding: it is 30~60 DEG C of in-mold moldings that plastic grain, which is injected temperature, using injection molding machine.The present invention by being still able to maintain good dielectricity so that the electrical strength of plastics maintains 20MV/m or more in lithium hydroxide of the raw material addition no more than 10% in high frequency.
Description
Technical field
The present invention relates to fibre reinforced plastics fields, more particularly, to a kind of fibre-reinforced plastic motor shell and its molding
Technique.
Background technique
Plastics be using monomer as raw material, can be free by high-molecular compound made of addition polymerization or polycondensation polymerized
Change ingredient and body styles, is made of the additives such as synthetic resin and filler, plasticizer, stabilizer, lubricant, colorant.
The main component of plastics is resin, and resin is the lipid secreted out of by animals and plants and gains the name, such as rosin, shellac,
Resin refers to the high-molecular compound not yet with various additives mixing.Resin accounts for about the 40%~100% of plastics total weight.Modeling
The basic performance of material depends mainly on the person's character of resin, but additive also plays an important role.Some plastics are substantially by closing
It is formed, is free of or less containing additive, such as organic glass, polystyrene at resin.
Plastics have cheap, excellent in mechanical performance, and good insulation preformance forms simple and efficient feature, is widely used in
Military project, electric component, instrument, the fields such as building.But such material is not easy to store there is also property is crisp, and heat resistance is limited etc.
Defect.
Engineering plastics refer generally to that certain external force can be born, and have good mechanical performance and high- and low-temperature resistance performance,
Dimensional stability is preferable, may be used as the plastics of engineering structure, such as polyamide, polysulfones.It is classified as again in engineering plastics
General engineering plastic and special engineering plastics two major classes.Engineering plastics are in mechanical performance, durability, corrosion resistance, heat resistance etc.
Aspect can reach higher requirement, and process more convenient and alternative metal material.Engineering plastics are widely used in electronics
Electrically, the industries such as automobile, building, office equipment, machinery, aerospace are become with moulding Dai Gang, having become international popular to mould Dai Mu
Gesture.General engineering plastic includes: that polyamide, polyformaldehyde, polycarbonate, Noryl, thermoplastic polyester, super high molecular weight are poly-
Ethylene, methylpentene polymer, ethenol copolymer etc..
The patent application of Publication No. CN102977567A proposes a kind of fire-retardant unsaturated polyester die plastic, be by with
The raw material of lower parts by weight is constituted: 17.2~21.5 parts of unsaturated polyester resin；12.2~14.3 parts of low shrinkage additive；Containing double
0.8~1.2 part of key monomer；0.3~0.65 part of initiator；0.003~0.005 part of polymerization inhibitor；0.08~0.35 part of thickener；It fills out
60~80 parts of material；9.8~15 parts of fire retardant；2~3 parts of metal oxide；1.2~1.7 parts of release agent；Reinforcing fiber 15~18
Part.Above-mentioned plastics are by test, bending strength 92MPa, impact strength 32KJ/m2,1 × 1013 Ω of resistance, electrical strength
12.0MV/m, dielectric dissipation factor 0.014.The electrical strength of the plastics is lower, if for manufacturing electric machine casing, certain extreme
Under the conditions of be easy breakdown, there are some potential safety problemss.
Summary of the invention
To overcome the existing lower defect of plastics electrical strength, the invention proposes a kind of fibre-reinforced plastic motor shells
And its moulding process, by the way that glass fibre is added in the feed, so that electric machine casing high mechanical strength, tough and hard wear resistant, size are steady
Fixed, corrosion-resistant, electrical insulation capability is excellent.
In order to achieve the above object, specific technical solution of the present invention is as follows:
A kind of fibre-reinforced plastic motor shell, comprises the following components in parts by weight:
In the present invention, alkali-free glass fibre using the content of alkali metal oxide less than 0.8% can significantly improve plastics
Mechanical strength, have excellent a chemical stability and electrical insulation capability, wood powder is added as organic filler, and modeling can be improved
The intensity and heat resistance of material, and reduce cost；It further, is the electrical insulation capability for improving plastic motor shell, in the feed
Be added be no more than 10% lithium hydroxide, further preferably 4~8% so that the electrical strength of plastics maintain 20MV/m with
On, it is still able to maintain good dielectricity in high frequency.
Further, the thermosetting resin include phenolic resin that parts by weight are 30~70% and parts by weight be 5~
25% polyimide resin.
The present invention uses two-component resin, and phenolic resin brittleness is big, and color is deep, and curing rate is slow, the polyimides of addition
Resin, using its excellent mechanical performance, in conjunction with phenolic resin after, can reduce brittleness caused by phenolic resin, promote modeling
Bending, stretching and the impact strength of material；As it is further preferred that the parts by weight of the polyimide resin are 5~15%；
Parts by weight herein are with the poidometer of entire raw material.
Preferably, the alkali-free glass fibre includes long fibre and staple fiber, wherein long stapled length be 3~
The length of 12cm, staple fiber are 2~15mm, and the additional amount of staple fiber accounts for the 5~40% of entire alkali-free glass fibre weight.
The present invention is in such a way that long fibre and staple fiber combine, long stapled addition, the boundary of glass fibre and resin
Face area increases, and in fracture, the resistance that glass fibre is extracted out from resin increases plastics, improves plastics and bears tensile load
Ability；The staple fiber of addition uniformly mixes in resin with long fibre, it is easier to be dispersed in resin, have more excellent power
Performance is learned, also avoids occurring floating fibre in injection molding process.
It is further preferred that the long stapled length is 3~6cm, the length of staple fiber is 6~12mm, staple fiber
Additional amount is 5~15%.
Preferably, the long fibre impregnates in the carboxymethylcellulose sodium solution that concentration is 0.05~0.15%
0.5~2H.
Glass fibre is modified using carboxymethylcellulose sodium solution, it is excessively stiffening convenient for long fibre, influence its
Dispersing uniformity in resin.
In the present invention, dispersing agent can stablize dispersed pigment, improve tinting strength, tinting power and lithium hydroxide and mix in raw material
Dispersion degree in the process, it is preferred that the dispersing agent is silicates dispersing agent or alkali metal phosphate class dispersing agent.
Release agent is detached from out of mold after being conducive to plastic shaping, and motor casing surface can be made to be easy to be detached from, is smooth and clean；
Preferably, the release agent is the mixture of one or both of calcium stearate and zinc stearate.
Preferably, the curing agent is hexamethylenetetramine.
The invention also discloses the moulding process of above-mentioned plastic motor shell, comprising:
It is granulated: weighing the thermosetting resin, alkali-free glass fibre, lithium hydroxide, wood powder, dispersing agent, pigment, demoulding
Agent and curing agent, at a temperature of 30~50 DEG C, mixing obtains uniform powdery material in 30~60 minutes, is kneaded subsequently into Granulation Equipments
Granulation；
Injection molding: it is 30~60 DEG C of in-mold moldings that plastic grain, which is injected temperature, using injection molding machine.
In the present invention, since fiberglass reinforcement is added, causes the melt index of plastics to reduce, mold temperature should be kept to exist
30~60 DEG C, preferably 50~60 DEG C, the contact resistance of reduction glass fibre and molding die, reduction glass fibre and resin
Speed difference, it is floating fine from avoiding the occurrence of.
The present invention by being added glass fibre in the feed, so that electric machine casing high mechanical strength, tough and hard wear resistant, size are steady
It is fixed, it is corrosion-resistant, and the lithium hydroxide no more than 10% is added, so that the electrical strength of plastics maintains 20MV/m or more, in height
Good dielectricity is still able to maintain under frequency.
Specific embodiment
Embodiment 1
Plastic motor casing forming raw material includes following component by weight:
40 parts of thermosetting resin, including 35 parts and 5 parts of polyimide resin of phenolic resin；
35 parts of alkali-free glass fibre, including 30 parts of long glass fibres that length is 3cm, length is the short glass of 2mm
5 parts of fiber, and immersion 0.5 is small in the carboxymethylcellulose sodium solution that concentration is 0.05~0.15% in advance for long glass fibres
When；
5 parts of lithium hydroxide；10 parts of wood powder；2 parts of silicates dispersing agent；0.5 part of pigment, 2 parts of release agent and six methines
5.5 parts of tetramine.
It is as follows by the moulding process of said components:
It is granulated: weighing thermosetting resin, alkali-free glass fibre, lithium hydroxide, wood powder, the dispersing agent, face of above-mentioned parts by weight
Material, release agent and hexamethylenetetramine, at a temperature of 30~50 DEG C, mixing obtains uniform powdery material in 30~60 minutes, then into
Enter Granulation Equipments and is kneaded granulation；
Injection molding: it is 30~35 DEG C of in-mold moldings that plastic grain, which is injected temperature, using injection molding machine.
Performance detection (GB/T23641-2009) is carried out to sample obtained:
Density 1.75g/cm3, simple beam impact strength 12.8KJ/m2, bending strength 78.4MPa, tensile strength 22.6MPa,
The 178s of resistance to electric arc, insulation resistance 6.6 × 1012；
Electrical strength is 20.3MV/m, thickness of sample 1.90mm, and test uses Φ 20mm/ Φ 20mm ball electrode system,
The fast boosting mode of speed, carries out in normality transformer oil.
Embodiment 2
Plastic motor casing forming raw material includes following component by weight:
40 parts of thermosetting resin, including 35 parts and 5 parts of polyimide resin of phenolic resin；
35 parts of alkali-free glass fibre, including 30 parts of long glass fibres that length is 6cm, length is the short glass of 2mm
5 parts of fiber, and immersion 0.5 is small in the carboxymethylcellulose sodium solution that concentration is 0.05~0.15% in advance for long glass fibres
When；
8 parts of lithium hydroxide；10 parts of wood powder；2 parts of silicates dispersing agent；0.5 part of pigment, 2 parts of release agent and six methines
2.5 parts of tetramine.
It is as follows by the moulding process of said components:
It is granulated: weighing thermosetting resin, alkali-free glass fibre, lithium hydroxide, wood powder, the dispersing agent, face of above-mentioned parts by weight
Material, release agent and hexamethylenetetramine, at a temperature of 30~50 DEG C, mixing obtains uniform powdery material in 30~60 minutes, then into
Enter Granulation Equipments and is kneaded granulation；
Injection molding: it is 30~35 DEG C of in-mold moldings that plastic grain, which is injected temperature, using injection molding machine.
Performance detection (GB/T23641-2009) is carried out to sample obtained:
Density 1.76g/cm3, simple beam impact strength 12.7KJ/m2, bending strength 78.3MPa, tensile strength 22.7MPa,
The 178s of resistance to electric arc, insulation resistance 6.6 × 1012；
Electrical strength is 23.6MV/m, thickness of sample 1.90mm, and test uses Φ 20mm/ Φ 20mm ball electrode system,
The fast boosting mode of speed, carries out in normality transformer oil.
Embodiment 3
Plastic motor casing forming raw material includes following component by weight:
40 parts of thermosetting resin, including 35 parts and 5 parts of polyimide resin of phenolic resin；
35 parts of alkali-free glass fibre, including 30 parts of long glass fibres that length is 10cm, length is the short glass of 2mm
5 parts of fiber, and immersion 0.5 is small in the carboxymethylcellulose sodium solution that concentration is 0.05~0.15% in advance for long glass fibres
When；
10 parts of lithium hydroxide；5 parts of wood powder；2 parts of silicates dispersing agent；0.5 part of pigment, 2 parts of release agent and six methines
5.5 parts of tetramine.
It is as follows by the moulding process of said components:
It is granulated: weighing thermosetting resin, alkali-free glass fibre, lithium hydroxide, wood powder, the dispersing agent, face of above-mentioned parts by weight
Material, release agent and hexamethylenetetramine, at a temperature of 30~50 DEG C, mixing obtains uniform powdery material in 30~60 minutes, then into
Enter Granulation Equipments and is kneaded granulation；
Injection molding: it is 30~35 DEG C of in-mold moldings that plastic grain, which is injected temperature, using injection molding machine.
Performance detection (GB/T23641-2009) is carried out to sample obtained:
Density 1.75g/cm3, simple beam impact strength 12.4KJ/m2, bending strength 78.1MPa, tensile strength 22.9MPa,
The 178s of resistance to electric arc, insulation resistance 6.6 × 1012；
Electrical strength is 21.6MV/m, thickness of sample 1.90mm, and test uses Φ 20mm/ Φ 20mm ball electrode system,
The fast boosting mode of speed, carries out in normality transformer oil.
Embodiment 4
Plastic motor casing forming raw material includes following component by weight:
60 parts of thermosetting resin, including 45 parts and 15 parts of polyimide resin of phenolic resin；
20 parts of alkali-free glass fibre, including 15 parts of long glass fibres that length is 6cm, length is the short glass of 6mm
5 parts of fiber, and long glass fibres impregnates 1 hour in the carboxymethylcellulose sodium solution that concentration is 0.05~0.15% in advance；
8 parts of lithium hydroxide；5 parts of wood powder；1 part of alkali metal phosphate class dispersing agent；0.5 part of pigment, 1.5 parts of release agent and six
4 parts of methine tetramine.
It is as follows by the moulding process of said components:
It is granulated: weighing thermosetting resin, alkali-free glass fibre, lithium hydroxide, wood powder, the dispersing agent, face of above-mentioned parts by weight
Material, release agent and hexamethylenetetramine, at a temperature of 30~50 DEG C, mixing obtains uniform powdery material in 30~60 minutes, then into
Enter Granulation Equipments and is kneaded granulation；
Injection molding: it is 35~40 DEG C of in-mold moldings that plastic grain, which is injected temperature, using injection molding machine.
Performance detection (GB/T23641-2009) is carried out to sample obtained:
Density 1.82g/cm3, simple beam impact strength 13.2KJ/m2, bending strength 76.3MPa, tensile strength 20.7MPa,
The 161s of resistance to electric arc, insulation resistance 6.54 × 1012；
Electrical strength is 23.2MV/m, thickness of sample 1.90mm, and test uses Φ 20mm/ Φ 20mm ball electrode system,
The fast boosting mode of speed, carries out in normality transformer oil.
Embodiment 5
Plastic motor casing forming raw material includes following component by weight:
60 parts of thermosetting resin, including 50 parts and 10 parts of polyimide resin of phenolic resin；
20 parts of alkali-free glass fibre, including 15 parts of long glass fibres that length is 6cm, length is the short glass of 2mm
5 parts of fiber, and long glass fibres impregnates 1 hour in the carboxymethylcellulose sodium solution that concentration is 0.05~0.15% in advance；
8 parts of lithium hydroxide；5 parts of wood powder；1 part of alkali metal phosphate class dispersing agent；0.5 part of pigment, 1.5 parts of release agent and six
4 parts of methine tetramine.
It is as follows by the moulding process of said components:
It is granulated: weighing thermosetting resin, alkali-free glass fibre, lithium hydroxide, wood powder, the dispersing agent, face of above-mentioned parts by weight
Material, release agent and hexamethylenetetramine, at a temperature of 30~50 DEG C, mixing obtains uniform powdery material in 30~60 minutes, then into
Enter Granulation Equipments and is kneaded granulation；
Injection molding: it is 35~40 DEG C of in-mold moldings that plastic grain, which is injected temperature, using injection molding machine.
Performance detection (GB/T23641-2009) is carried out to sample obtained:
Density 1.83g/cm3, simple beam impact strength 15.2KJ/m2, bending strength 81.3MPa, tensile strength 25.7MPa,
The 165s of resistance to electric arc, insulation resistance 6.54 × 1012；
Electrical strength is 23.4MV/m, thickness of sample 1.90mm, and test uses Φ 20mm/ Φ 20mm ball electrode system,
The fast boosting mode of speed, carries out in normality transformer oil.
Embodiment 6
Plastic motor casing forming raw material includes following component by weight:
50 parts of thermosetting resin, including 40 parts and 10 parts of polyimide resin of phenolic resin；
30 parts of alkali-free glass fibre, including 25 parts of long glass fibres that length is 5cm, length is the short glass of 8mm
5 parts of fiber, and long glass fibres impregnates 1 hour in the carboxymethylcellulose sodium solution that concentration is 0.05~0.15% in advance；
8 parts of lithium hydroxide；5 parts of wood powder；1 part of alkali metal phosphate class dispersing agent；0.5 part of pigment, 1.5 parts of release agent and six
4 parts of methine tetramine.
It is as follows by the moulding process of said components:
It is granulated: weighing thermosetting resin, alkali-free glass fibre, lithium hydroxide, wood powder, the dispersing agent, face of above-mentioned parts by weight
Material, release agent and hexamethylenetetramine, at a temperature of 30~50 DEG C, mixing obtains uniform powdery material in 30~60 minutes, then into
Enter Granulation Equipments and is kneaded granulation；
Injection molding: it is 40~45 DEG C of in-mold moldings that plastic grain, which is injected temperature, using injection molding machine.
Performance detection (GB/T23641-2009) is carried out to sample obtained:
Density 1.87g/cm3, simple beam impact strength 16.2KJ/m2, bending strength 83.3MPa, tensile strength 26.9MPa,
The 163s of resistance to electric arc, insulation resistance 6.54 × 1012；
Electrical strength is 23.3MV/m, thickness of sample 1.90mm, and test uses Φ 20mm/ Φ 20mm ball electrode system,
The fast boosting mode of speed, carries out in normality transformer oil.
Embodiment 7
Plastic motor casing forming raw material includes following component by weight:
47 parts of thermosetting resin, including 40 parts and 7 parts of polyimide resin of phenolic resin；
33 parts of alkali-free glass fibre, including 27 parts of long glass fibres that length is 5cm, length is the short glass of 10mm
6 parts of fiber, and long glass fibres impregnates 1 hour in the carboxymethylcellulose sodium solution that concentration is 0.05~0.15% in advance；
8 parts of lithium hydroxide；5 parts of wood powder；1 part of alkali metal phosphate class dispersing agent；0.5 part of pigment, 0.5 part of release agent and six
5 parts of methine tetramine.
It is as follows by the moulding process of said components:
It is granulated: weighing thermosetting resin, alkali-free glass fibre, lithium hydroxide, wood powder, the dispersing agent, face of above-mentioned parts by weight
Material, release agent and hexamethylenetetramine, at a temperature of 30~50 DEG C, mixing obtains uniform powdery material in 30~60 minutes, then into
Enter Granulation Equipments and is kneaded granulation；
Injection molding: it is 40~45 DEG C of in-mold moldings that plastic grain, which is injected temperature, using injection molding machine.
Performance detection (GB/T23641-2009) is carried out to sample obtained:
Density 1.86g/cm3, simple beam impact strength 16.8KJ/m2, bending strength 84.3MPa, tensile strength 27.5MPa,
The 163s of resistance to electric arc, insulation resistance 6.54 × 1012；
Electrical strength is 22.9MV/m, thickness of sample 1.90mm, and test uses Φ 20mm/ Φ 20mm ball electrode system,
The fast boosting mode of speed, carries out in normality transformer oil.
The foregoing is merely preferable implementation examples of the invention, are not intended to restrict the invention, it is all in spirit of that invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of fibre-reinforced plastic motor shell, which is characterized in that the group including following parts by weight of the plastic motor shell
Point:
The polyimides that the thermosetting resin includes the phenolic resin that parts by weight are 30~70 parts and parts by weight are 5~15 parts
Resin；
The alkali-free glass fibre includes long fibre and staple fiber, wherein long stapled length is 3~12cm, the length of staple fiber
Degree is 2~15mm, and the additional amount of staple fiber accounts for the 5~40% of entire alkali-free glass fibre weight；The long fibre is dense
Degree is 0.5~2H of immersion in 0.05~0.15% carboxymethylcellulose sodium solution.
2. plastic motor shell as described in claim 1, which is characterized in that the long stapled length is 3~6cm, staple fiber
Length be 6~12mm, the additional amount of staple fiber is 5~15%.
3. plastic motor shell as described in claim 1, which is characterized in that the dispersing agent is silicates dispersing agent or alkali
Metal tripolyphosphate salt dispersing agent.
4. plastic motor shell as described in claim 1, which is characterized in that the release agent is calcium stearate and zinc stearate
One or both of mixture.
5. plastic motor shell as described in claim 1, which is characterized in that the curing agent is hexamethylenetetramine.
6. a kind of moulding process of any one of Claims 1 to 5 plastic motor shell characterized by comprising
Be granulated: weigh the thermosetting resin, alkali-free glass fibre, lithium hydroxide, wood powder, dispersing agent, pigment, release agent and
Curing agent, at a temperature of 30~50 DEG C, mixing obtains uniform powdery material in 30~60 minutes, is kneaded and makes subsequently into Granulation Equipments
Grain；
Injection molding: it is 30~60 DEG C of in-mold moldings that plastic grain, which is injected temperature, using injection molding machine.
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| JP2005263828A (en) * | 2004-03-16 | 2005-09-29 | Asahi Kasei Chemicals Corp | Long fiber-reinforced polyamide resin material |
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| CN104114619A (en) * | 2012-02-17 | 2014-10-22 | Dic株式会社 | Fiber-reinforced resin composite body, and reinforced matrix resin for fiber-reinforced resin |
| CN105400038A (en) * | 2015-11-13 | 2016-03-16 | 太仓荣中机电科技有限公司 | Shell material for electronic product |
| CN105754311A (en) * | 2016-03-16 | 2016-07-13 | 无锡新宏泰电器科技股份有限公司 | Polyester BMC (bulk molding compound) and preparation method and application thereof |
| CN105837916A (en) * | 2016-06-17 | 2016-08-10 | 国网山东省电力公司东阿县供电公司 | High-strength corrosion resistance distribution box used for electric power |
-
2016
- 2016-08-12 CN CN201610659579.1A patent/CN106317762B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005263828A (en) * | 2004-03-16 | 2005-09-29 | Asahi Kasei Chemicals Corp | Long fiber-reinforced polyamide resin material |
| CN104114619A (en) * | 2012-02-17 | 2014-10-22 | Dic株式会社 | Fiber-reinforced resin composite body, and reinforced matrix resin for fiber-reinforced resin |
| CN103524975A (en) * | 2013-10-28 | 2014-01-22 | 北京福润德复合材料有限责任公司 | Halogen-free flame-retardant highly-heat-resistant unsaturated polyester glass fiber composite material |
| CN105400038A (en) * | 2015-11-13 | 2016-03-16 | 太仓荣中机电科技有限公司 | Shell material for electronic product |
| CN105754311A (en) * | 2016-03-16 | 2016-07-13 | 无锡新宏泰电器科技股份有限公司 | Polyester BMC (bulk molding compound) and preparation method and application thereof |
| CN105837916A (en) * | 2016-06-17 | 2016-08-10 | 国网山东省电力公司东阿县供电公司 | High-strength corrosion resistance distribution box used for electric power |
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| CN106317762A (en) | 2017-01-11 |
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