CN104448747A - Ultrahigh wear-resistant BMC molding compound and preparation method thereof - Google Patents
Ultrahigh wear-resistant BMC molding compound and preparation method thereof Download PDFInfo
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- CN104448747A CN104448747A CN201410764898.XA CN201410764898A CN104448747A CN 104448747 A CN104448747 A CN 104448747A CN 201410764898 A CN201410764898 A CN 201410764898A CN 104448747 A CN104448747 A CN 104448747A
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- 238000000465 moulding Methods 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 150000001875 compounds Chemical class 0.000 title abstract description 6
- 239000000835 fiber Substances 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 23
- 239000003365 glass fiber Substances 0.000 claims abstract description 22
- 239000000654 additive Substances 0.000 claims abstract description 11
- 230000000996 additive effect Effects 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 229920006337 unsaturated polyester resin Polymers 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 8
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 8
- 239000000049 pigment Substances 0.000 claims abstract description 6
- 238000011049 filling Methods 0.000 claims abstract description 5
- 239000000206 moulding compound Substances 0.000 claims description 18
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- UHOVQNZJYSORNB-UHFFFAOYSA-N monobenzene Natural products C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 239000003513 alkali Substances 0.000 claims description 9
- 229920002554 vinyl polymer Polymers 0.000 claims description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- 239000011777 magnesium Substances 0.000 claims description 7
- 230000003647 oxidation Effects 0.000 claims description 7
- 238000007254 oxidation reaction Methods 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 6
- 230000008719 thickening Effects 0.000 claims description 6
- 239000004793 Polystyrene Substances 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 238000013019 agitation Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 5
- 229920002223 polystyrene Polymers 0.000 claims description 5
- 238000011417 postcuring Methods 0.000 claims description 5
- MXRIRQGCELJRSN-UHFFFAOYSA-N O.O.O.[Al] Chemical compound O.O.O.[Al] MXRIRQGCELJRSN-UHFFFAOYSA-N 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical group [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims description 2
- -1 process auxiliaries Substances 0.000 claims description 2
- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-UHFFFAOYSA-N 0.000 claims description 2
- 230000007774 longterm Effects 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract description 2
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 abstract 1
- 238000004898 kneading Methods 0.000 abstract 1
- 239000002562 thickening agent Substances 0.000 abstract 1
- 239000004412 Bulk moulding compound Substances 0.000 description 46
- 238000005516 engineering process Methods 0.000 description 7
- 239000000945 filler Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000009958 sewing Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 229920006305 unsaturated polyester Polymers 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 244000001591 balata Species 0.000 description 1
- 235000016302 balata Nutrition 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Abstract
The invention discloses an ultrahigh wear-resistant BMC molding compound which comprises the following raw materials in percentage by mass: 20-30 percent of unsaturated polyester resin, 5-10 percent of a low shrinkage additive, 25-30 percent of an inorganic filling material, 15-25 percent of organic butadiene styrene rubber, 0.1-0.4 percent of a curing agent, 0.8-1.2 percent of a release agent, 0.2-0.4 percent of a thickening agent, 1-3 percent of pigments, 0.1-0.3 percent of an antioxidant, 0.5-1.0 percent of a process additive, 3-5 percent of organic fibers and 10-15 percent of glass fibers. The preparation method comprises the following steps: mixing the various raw materials, kneading, and performing high-temperature and high-pressure molding, thereby obtaining the molding compound product. The BMC molding compound disclosed by the invention is excellent in surface wear resistance, and the wear resistance is doubled compared with that of common BMC molding compounds. Meanwhile, the material disclosed by the invention can maintain the original excellent performance in a long-term friction state.
Description
Technical field
The present invention relates to composite insulating material field, especially relate to a kind of super-high wear-resistant unsaturated polyester Bulk Molding Compound and preparation method thereof.
Background technology
BMC (bulk moulding compound) material, i.e. glass fiber reinforced unsaturated polyester plastic, it mainly by starting material such as unsaturated polyester resin, low shrinkage additive, initiator, filler, enhanced short fiber through the mixing a kind of thermosetting material of physics.Be applicable to the multiple thermoforming process such as mold pressing, injection, transmission, goods have that physical strength is high, high temperature resistant, any surface finish, the feature such as fire-retardant.Excellent machinery, electric property make it have a wide range of applications in industries such as automobile, building, electrical equipment, instrument.If automobile side flow deflector, bumper, motor car engine noise screening box, headlight for vehicles reverberation bowl, motorway anti-glazing plate, electric equipment insulator, electrically cease spark cover, business machine parts, Coal Electricity telephone set case etc. are all the application examples of BMC.
Along with BMC product is widely used in various industry, also the defect in some its performances is exposed, outbalance be wear resisting property, so now also only by BMC for the manufacture of parts such as some outward appearances, shell, structures, real for producing with other products the parts rubbed, or shorter mention.
Summary of the invention
For the problems referred to above that prior art exists, the invention provides a kind of super-high wear-resistant BMC moulding compound and preparation method thereof.Super-high wear-resistant BMC of the present invention adds novel wear-resisting organic filler and polyvinyl formal fibre in the agent structure of conventional BMC, improve the surface abrasion resistance of BMC moulding compound greatly, the more common BMC moulding compound of wear resistance doubles, and material of the present invention can keep its original premium properties again under the state of long-term friction simultaneously.
Technical scheme of the present invention is as follows:
A kind of super-high wear-resistant BMC moulding compound, the massfraction of contained raw material and each raw material is:
Described unsaturated polyester resin is adjacent benzene unsaturated polyester resin, and viscosity is 1350-2000mPas, and it has excellent wetting property to glass fibre, well can infiltrate with styrene-butadiene rubber(SBR).
Described low shrinkage additive is polystyrene, has superior contraction controlling, tint permanence and oilness; Described inorganic filling material is hydrated aluminum oxide or the calcium carbonate powders of particle diameter 7-9um; Described organic styrene-butadiene rubber(SBR) is the ultra-fine styrene-butadiene rubber(SBR) powder of particle diameter 5-7um; Select the filler of different-grain diameter that final molecular structure can be made tightr.
Described solidifying agent is peroxidized t-butyl perbenzoate, and purity is more than 98%, 10 hr half-life decomposition temperatures is 104 DEG C; Described releasing agent is calcium stearate powder, particle diameter 200 order; Described thickening material liquid oxidation magnesium, it easily disperses, and can not produce dust; Described antioxidant is 2,6-di-t-butyl Pyrogentisinic Acid; Described process auxiliaries is BYK-W-996, is the copolymer solution containing acidic-group, has stable mode plastics, improve liquidity, the effect of release property.
Described organic fibre is polyvinyl formal fibre; Described glass fibre is alkali free glass fibre, and Cutting Length is 6-12mm.
A preparation method for super-high wear-resistant BMC moulding compound, concrete steps are as follows:
(1) first by unsaturated polyester resin, low shrinkage additive, process auxiliaries, pigment, antioxidant in dispersion machine agitation vat with the rotating speed of 1500-2500 rev/min, stir and join in BMC kneader after 5-10 minute;
(2) in BMC kneader, add organic fibre polyvinyl formal fibre again, with the rotating speed of 20-28 rev/min, stir 5-10 minute, itself and step (1) gained pre-composition are mixed; Organic fibre surface is fully infiltrated pre-composition, and organic fibre can combine on the glass fibers by follow-up adding after glass fibre more fully, strengthens bonding strength between organic fibre, resin, glass fibre three;
(3) inorganic filling material, organic styrene-butadiene rubber(SBR) and releasing agent are added in BMC kneader, mediate 15-20 minute with the rotating speed of 40-50 rev/min;
(4) thickening material liquid oxidation magnesium is added in BMC kneader, mediate 10-20 minute with the rotating speed of 20-28 rev/min;
(5) added by glass fibre in BMC kneader, mediate 10-15 minute with the rotating speed of 40-50 rev/min, raw material has mixed post curing more than 1 day again;
(6) by the raw mixture after slaking in BMC moulding press, the shaping obtained layered product of High Temperature High Pressure.
In described step (6), high temperature is 140-160 DEG C, and high pressure is 120-180KG/cm
2.
The technique effect that the present invention is useful is:
1, material of the present invention is the wear-resisting BMC of a kind of novel super-high developed on the basis of original common BMC, can use under friction environment, as the phase mutual friction with materials such as iron, aluminium, rubber, balata belts; Can belt pulley for sewing machine be used in, in the products such as sewing machine hand-wheel, BMC can be generalized to sewing machine industry from car industry and electrician's industry.
2, material of the present invention is 2% to friction rail wastage rate, and is 5% to make moderate progress relative to common BMC moulding compound to friction rail wastage rate, improves wear resistance.
3, present invention achieves the low rate of wear of the mutual friction between polyester molding compound and other materials, ultra-fine styrene-butadiene rubber(SBR) filler makes the wear resistance of material promote; Organic fibre add the associativity effectively improving resin and filler, the wear resistance that can to promote material to the winding of high rigidity glass fibre filled by organic fibre; The abrasion resistance on multiple filler combination optimized selection improving product surface.
4, the present invention passes through the dispersion technology of high oil-absorption(number) packing material and organic fibre; Organic fibre is to the winding technology of high rigidity glass fibre; The technology that ultra-fine styrene-butadiene rubber(SBR) filler controls system oil-absorption(number); The design of formula and additive technology and industrialized technology; The combination of multiple technologies, obtained high abrasion BMC moulding compound of the present invention.
5, in the conventional moulding compound of material improvement of the present invention, alkali free glass fibre is as the bonding strength of strongthener and resin lower, glass fibre is caused very easily to come off thus as the problem of abrasive wear equipment, the present invention adopts alkali free glass fibre and organic fibre to replace former alkali free glass fibre as strongthener, and organic fibre can improve the bonding strength of alkali free glass fibre and interlaminar resin; Add the part of wear-resisting styrene-butadiene rubber(SBR) as filler simultaneously, thus improve the wear resisting property of whole product.
Embodiment
Below in conjunction with embodiment, the present invention is specifically described.
Embodiment 1
A preparation method for super-high wear-resistant BMC moulding compound, concrete steps are as follows:
(1) first by 20% adjacent benzene unsaturated polyester resin (2000mPas), 10% low shrinkage additive polystyrene, 1.0% process auxiliaries (BYK-W-996), 2% pigment, 0.2% antioxidant (2,6-di-t-butyl Pyrogentisinic Acid), with the rotating speed of 1500 revs/min in dispersion machine agitation vat, stir and join in BMC kneader after 10 minutes;
(2) in BMC kneader, add 3% organic fibre polyvinyl formal fibre again, with the rotating speed of 28 revs/min, stir 5 minutes, itself and step (1) gained pre-composition are mixed;
(3) by 30% hydrated aluminum oxide (particle diameter 7-9um), 20% organic styrene-butadiene rubber(SBR) and 1.0% calcium stearate powder (particle diameter 200 order), add in BMC kneader, mediate 20 minutes with the rotating speed of 40 revs/min;
(4) 0.4% thickening material liquid oxidation magnesium is added in BMC kneader, mediate 20 minutes with the rotating speed of 20 revs/min;
(5) add in BMC kneader by 12% alkali free glass fibre (Cutting Length 6-12mm) again, mediate 12 minutes with the rotating speed of 45 revs/min, raw material has mixed post curing 2 days;
(6) by the raw mixture after slaking in BMC moulding press, the shaping obtained layered product of High Temperature High Pressure.
In described step (6), high temperature is 140 DEG C, and high pressure is 180KG/cm
2.
Embodiment 2
A preparation method for super-high wear-resistant BMC moulding compound, concrete steps are as follows:
(1) first by 30% adjacent benzene unsaturated polyester resin (1350mPas), 5% low shrinkage additive polystyrene, 0.5% process auxiliaries (BYK-W-996), 3% pigment, 0.3% antioxidant (2,6-di-t-butyl Pyrogentisinic Acid), with the rotating speed of 2500 revs/min in dispersion machine agitation vat, stir and join in BMC kneader after 5 minutes;
(2) in BMC kneader, add 5% organic fibre polyvinyl formal fibre again, with the rotating speed of 20 revs/min, stir 10 minutes, itself and step (1) gained pre-composition are mixed;
(3) 25% calcium carbonate powders (particle diameter 7-9um), 15% organic styrene-butadiene rubber(SBR) and 0.8% stearic acid release agent calcium powder (particle diameter 200 order) are added in BMC kneader, mediate 15 minutes with the rotating speed of 50 revs/min;
(4) 0.2% thickening material liquid oxidation magnesium is added in BMC kneader, mediate 15 minutes with the rotating speed of 24 revs/min;
(5) add in BMC kneader by 15% alkali free glass fibre (Cutting Length 6-12mm) again, mediate 10 minutes with the rotating speed of 50 revs/min, raw material has mixed post curing 3 days;
(6) by the raw mixture after slaking in BMC moulding press, the shaping obtained layered product of High Temperature High Pressure.
In described step (6), high temperature is 160 DEG C, and high pressure is 120KG/cm
2.
Embodiment 3
A preparation method for super-high wear-resistant BMC moulding compound, concrete steps are as follows:
(1) first by 25% adjacent benzene unsaturated polyester resin (1500mPas), 8% low shrinkage additive polystyrene, 0.8% process auxiliaries (BYK-W-996), 2% pigment, 0.1% antioxidant (2,6-di-t-butyl Pyrogentisinic Acid), with the rotating speed of 2000 revs/min in dispersion machine agitation vat, stir and join in BMC kneader after 8 minutes;
(2) in BMC kneader, add 4.5% organic fibre polyvinyl formal fibre again, with the rotating speed of 25 revs/min, stir 6 minutes, itself and step (1) gained pre-composition are mixed;
(3) 23% hydrated aluminum oxide (particle diameter 7-9um), 25% organic styrene-butadiene rubber(SBR) and 1.2% stearic acid release agent calcium powder (particle diameter 200 order) are added in BMC kneader, mediate 18 minutes with the rotating speed of 45 revs/min;
(4) 0.3% thickening material liquid oxidation magnesium is added in BMC kneader, mediate 10 minutes with the rotating speed of 28 revs/min;
(5) add in BMC kneader by 10% alkali free glass fibre (Cutting Length 6-12mm) again, mediate 15 minutes with the rotating speed of 40 revs/min, raw material has mixed post curing 2 days;
(6) by the raw mixture after slaking in BMC moulding press, the shaping obtained layered product of High Temperature High Pressure.
In described step (6), high temperature is 150 DEG C, and high pressure is 160KG/cm
2.
Embodiment 1 products obtained therefrom is carried out Performance Detection, the results are shown in Table 1.
Table 1
| Test event | Unit | Test method(s) | Technical indicator |
| Molding proportion | g/cm 3 | ISO 1183-2004(E) | 1.8–1.95 |
| Shaping shrinkage rate | ％ | ISO 2577-1984(E) | ＜0.15 |
| Water-intake rate | mg | ISO 62-1999(E) | ＜0.2 |
| Heat-drawn wire | ℃ | ISO 75-1987(E) | ＞220 |
| Flexural strength | MPa | ISO 178-2001(E) | ≥110 |
| Shock strength (but shellfish) | KJ/m 2 | ISO 179-2000(E) | ≥30 |
| Insulation opposing (normality) | Ω | GB10064 | ＞10 13 |
| Insulation opposing (boiling) | Ω | GB10064 | ＞10 12 |
| Low abradability | ％ | GB3960 | ≤2％ |
Claims (7)
1. a super-high wear-resistant BMC moulding compound, is characterized in that the massfraction of contained raw material and each raw material is:
2. super-high wear-resistant BMC moulding compound according to claim 1, it is characterized in that described unsaturated polyester resin is adjacent benzene unsaturated polyester resin, viscosity is 1350-2000mPas.
3. super-high wear-resistant BMC moulding compound according to claim 1, is characterized in that described low shrinkage additive is polystyrene; Described inorganic filling material is hydrated aluminum oxide or the calcium carbonate powders of particle diameter 7-9um; Described organic styrene-butadiene rubber(SBR) is the ultra-fine styrene-butadiene rubber(SBR) powder of particle diameter 5-7um.
4. super-high wear-resistant BMC moulding compound according to claim 1, is characterized in that described solidifying agent is peroxidized t-butyl perbenzoate, and purity is more than 98%, 10 hr half-life decomposition temperatures is 104 DEG C; Described releasing agent is calcium stearate powder, particle diameter 200 order; Described thickening material liquid oxidation magnesium; Described antioxidant is 2,6-di-t-butyl Pyrogentisinic Acid; Described process auxiliaries is BYK-W-996.
5. super-high wear-resistant BMC moulding compound according to claim 1, is characterized in that described organic fibre is polyvinyl formal fibre; Described glass fibre is alkali free glass fibre, and Cutting Length is 6-12mm.
6. a preparation method for super-high wear-resistant BMC moulding compound according to claim 1, is characterized in that concrete steps are as follows:
(1) first by unsaturated polyester resin, low shrinkage additive, process auxiliaries, pigment, antioxidant in dispersion machine agitation vat with the rotating speed of 1500-2500 rev/min, stir and join in BMC kneader after 5-10 minute;
(2) in BMC kneader, add organic fibre polyvinyl formal fibre again, with the rotating speed of 20-28 rev/min, stir 5-10 minute, itself and step (1) gained pre-composition are mixed;
(3) inorganic filling material, organic styrene-butadiene rubber(SBR) and releasing agent are added in BMC kneader, mediate 15-20 minute with the rotating speed of 40-50 rev/min;
(4) thick dose of liquid oxidation magnesium is added in BMC kneader, mediate 10-20 minute with the rotating speed of 20-28 rev/min;
(5) added by glass fibre in BMC kneader, mediate 10-15 minute with the rotating speed of 40-50 rev/min, raw material has mixed post curing more than 1 day again;
(6) by the raw mixture after slaking in BMC moulding press, the shaping obtained layered product of High Temperature High Pressure.
7. preparation method according to claim 6, it is characterized in that in described step (6), high temperature is 140-160 DEG C, high pressure is 120-180KG/cm
2.
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| CN107987454A (en) * | 2017-12-13 | 2018-05-04 | 苏州浩焱精密模具有限公司 | A kind of high intensity documents folder |
| CN108299813A (en) * | 2017-12-20 | 2018-07-20 | 安徽鑫普瑞复合材料有限公司 | A kind of high-strength, high-anti-friction SMC moulding compounds and its manufacturing method |
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| CN105482410A (en) * | 2015-12-18 | 2016-04-13 | 芜湖市艾德森自动化设备有限公司 | Wear-resistant glass fiber reinforced polyester material and preparing method thereof |
| CN107987454A (en) * | 2017-12-13 | 2018-05-04 | 苏州浩焱精密模具有限公司 | A kind of high intensity documents folder |
| CN108299813A (en) * | 2017-12-20 | 2018-07-20 | 安徽鑫普瑞复合材料有限公司 | A kind of high-strength, high-anti-friction SMC moulding compounds and its manufacturing method |
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