CN102359124A - BMC (dough moulding compound) long glass fiber die pressing well cover - Google Patents
BMC (dough moulding compound) long glass fiber die pressing well cover Download PDFInfo
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- CN102359124A CN102359124A CN2011102177093A CN201110217709A CN102359124A CN 102359124 A CN102359124 A CN 102359124A CN 2011102177093 A CN2011102177093 A CN 2011102177093A CN 201110217709 A CN201110217709 A CN 201110217709A CN 102359124 A CN102359124 A CN 102359124A
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Abstract
The invention discloses a BMC (dough moulding compound) long glass fiber die pressing well cover, belongs to a nonmetallic well cover and aims to provide a nonmetallic well cover which has high surface quality and does not need to be provided with reinforcing bars. The BMC long glass fiber die pressing well cover is formed in a mode that two layers of materials A and B are hot-pressed, cured and compounded by a die according to a weight ratio of 4:6, wherein the material A is prepared by mixing a sizing agent and staple glass fibers; the sizing agent is prepared from unsaturated polyester resin, tert butyl ester peroxide, zinc stearate, magnesium oxide, a coupling agent, nano montmorillonoid, styrene, polystyrene and ground calcium carbonate; and the material B is formed by long glass fibers impregnated with the sizing agent. Due to the adoption of the BMC long glass fiber die pressing well cover, not only are the smooth finish and the flatness of the surface of the well cover improved, but also the consistency of the well cover is improved, the defect that the reinforcing bars of the conventional well cover are easy to layer and strip from the BMC material is completely overcome, and the service life of the well cover is prolonged. The BMC long glass fiber die pressing well cover is the nonmetallic well cover which can replace the existing BMC reinforcing bar composite well cover.
Description
Technical field:The present invention relates to a kind of nonmetal well lid, relating in particular to a kind of is the combined manhole cover of primary raw material with the unsaturated polyester resin short glass fiber.
Background technology:At present, nonmetal well lid is many to be primary raw material with staple glass fibre and unsaturated polyester resin (being called for short BMC), solidifies through mould heat pressure to form.Because simple BMC material bearing capacity is not enough, the reinforcing bar that needs to add well lid gross weight 30% is as support framework; Therefore cost of manufacture is high, reinforcing bar consumption is big.Nonetheless, this BMC well lid bearing capacity that disposes reinforcing bar also has only 20T, does not still reach the bearing capacity of the major trunk roads well lid 40T of standard GB/T23858-2009 " well lid inspection " defined, and therefore present nonmetal well lid can only be used for subsidiary road.In addition, because the associativity of reinforcing bar and BMC material is relatively poor, in a single day well lid local damage occurs and just causes reinforcing bar and the layering gradually of BMC material easily, peels off, thereby causes integral body destruction and scrap.
Summary of the invention:To the above-mentioned defective that exists in the prior art, the present invention aim to provide a kind of surface quality good, need not the BMC roving glass fiber moulded well covers that configuration reinforcement can be up to state standards.
To achieve these goals; The present invention adopts following technical scheme: it is solidified through mould heat pressure by the weight ratio of 4:6 by A, B materials at two layers and is composited: with the even place mat of B layer material in 135～150 ℃ mould; Insert the A layer material then, matched moulds also keeps the pressure 7～15 minutes of 4～7MPa;
Said A layer material is formed by the preparation of raw material of following weight portion: unsaturated polyester resin 23～28, peroxidating uncle fourth fat 0.18, zinc stearate 4.5, magnesia 0.36, coupling agent 0.5, nanoscale montmorillonite 1.7, styrene 8, polystyrene 4.1, powdered whiting 28～40, length are 3 centimetres staple glass fibre 19～28; Its compound method is: styrene is mixed back heating for dissolving under 55～60 ℃ of conditions with polystyrene; Mix with unsaturated polyester resin then, add all the other each raw material stirring again and evenly integrate into dough;
Said B layer material is formed by the preparation of raw material of following weight portion: unsaturated polyester resin 25, peroxidating uncle fourth fat 0.18, zinc stearate 4.2, magnesia 0.36, coupling agent 0.5, nanoscale montmorillonite 2, styrene 7.8, polystyrene 3.9, powdered whiting 21, length are the long glass fiber 35 more than 50 centimetres; Its compound method is: styrene is mixed back heating for dissolving under 55～60 ℃ of conditions with polystyrene; Mix with unsaturated polyester resin then; Adding peroxidating uncle fourth fat, zinc stearate, magnesia, coupling agent, nanoscale montmorillonite, powdered whiting again stirs; Put into long glass fiber at last and roll dipping repeatedly with cylinder, the long glass fiber that will soak into is pulled out, is extracted.
In technique scheme, the optimal technical scheme of said A layer material is: unsaturated polyester resin 25, peroxidating uncle fourth fat 0.18, zinc stearate 4.5, magnesia 0.36, coupling agent 0.5, nanoscale montmorillonite 1.7, styrene 8, polystyrene 4.1, powdered whiting 34, staple glass fibre 24.
In technique scheme, unsaturated polyester resin plays bonding various material, and peroxidating uncle fourth fat has the heat cure effect; Zinc stearate plays demoulding effect, and staple glass fibre can play the effect of gaining in strength, and powdered whiting can play the filling pore effect; Styrene can play dilution and increase mobile effect; Magnesia can play thickening, avoid the effect of excess flow, and montmorillonite can improve the intensity that can make matrix and improve more than 10%, and long glass fiber can play alternative action of steel bars.
Compare with prior art, the present invention is that bearing bed substitutes original cage of reinforcement owing to adopted technique scheme with the long glass fiber B layer material that has soaked into unsaturated polyester resin, has therefore increased substantially the intensity and the supporting capacity of well lid; In addition; Owing to adopt the mode that hot moulding is solidified synchronously to be compounded with the A layer material that one deck constitutes with unsaturated polyester resin and staple glass fibre on the surface of B layer material; Therefore the fineness and the planeness on well lid surface have not only been improved; But also increased the density of well lid, further improved the intensity and the supporting capacity of well lid.The present invention since the method that has adopted hot moulding with performance very approaching A, B materials at two layers solidify compoundly synchronously, therefore thoroughly overcome traditional well lid reinforcing bar easily and the layering of BMC step material, the defective peeled off, prolonged application life.The mechanical performance that experiment showed, well lid of the present invention has met or exceeded each item index according to standard GB/T23858-2009 " well lid inspection " defined fully.Be respectively according to country's impact strength of being done of GB/T1843-1996, GB/T1040-1992, GB/T9341-2000 definitely below
Table 1:A, B expect the influence of ratio to intensity and surface quality
| A:B expects weight ratio | Bending strength (Mpa) | Surface quality |
| 1:9 | 414 | 1% cavity is arranged |
| 2:8 | 350 | 0.5% cavity is arranged |
| 3:7 | 320 | 0.1% cavity is arranged |
| 4:6 | 210 | Complete |
| 5:5 | 190 | Complete |
From table
1Can find out that long glass fiber content is high more, mechanical performance is good more, but because the flowability of long glass fiber dimension is poor, is difficult to intactly fill up whole space and influences its surface quality; And use more resin can cause cost to increase, so confirming as 4:6, the part by weight of A, two kinds of materials of B has cost performance preferably.
Table 2: the comparing result of well lid test result of the present invention and standard GB/T23858-2009
| Test item | National standard | Testing result |
| Hot strength mpa | ≥50 | 210 |
| Stretch modulus mpa | ≥2000 | 3100 |
| Bending strength mpa | ≥80 | 412 |
| Bending modulus mpa | ≥2000 | 20200 |
| Compressive strength mpa | ≥60 | 165 |
Can find out that from table 2 mechanical performance of well lid of the present invention is higher than 3～5 times of national standards.(diameter is 700mm to set up the bearing test model by national standard; Thickness is the rondelle well lid of 40mm); Well lid of the present invention and traditional BMC Reinforced bar manhole cover are carried out the bearing capacity contrast test can be found: the bearing capacity >=40T of well lid of the present invention, the requirement of National standard fully; And the bearing capacity of traditional BMC Reinforced bar manhole cover has only 20T, does not reach the national standard requirement, and the well lid quality is heavier.
Table 3: the long fibre position is to the influence of well lid mechanical performance
| The B material level is put | Flexural strength mpa |
| The B layer material is under last, A layer material are being expected | 102 |
| The B layer material is on following, A layer material are being expected | 210 |
Can find out from table 3; The B layer material below well lid the time mechanical strength best, this is that the A layer material plays the supporter effect because when above well lid, exerting pressure; Flexural strength is converted into the tensile strength of B layer material, and the stretching resistance of long glass fiber can resist material bending significantly the time.
The specific embodiment:Embodiment below in conjunction with concrete is described further the present invention:
Embodiment 1
1) 8 kilograms of styrene and polystyrene are mixed for 4.1 kilograms; Hot bath heating for dissolving with 55～60 ℃; Mix for 23 kilograms with unsaturated polyester resin then; Add 0.18 kilogram in peroxidating uncle fourth fat, 4.5 kilograms of zinc stearates, 0.36 kilogram in magnesia, the trade mark again and be 0.5 kilogram of the coupling agent of KH-550,1.7 kilograms of nano level montmorillonites, powdered whiting and stir 40 kilograms evenly; Dough was processed in 19 kilograms of kneadings of 3 centimetres of staple glass fibres that add length at last and be in 5 minutes, the A layer material;
2) 7.8 kilograms of styrene and polystyrene are mixed for 3.9 kilograms; Hot bath heating for dissolving with 55～60 ℃; Mix for 25 kilograms with unsaturated polyester resin then; Adding 0.18 kilogram in peroxidating uncle fourth fat, 4.2 kilograms of zinc stearates, 0.36 kilogram in magnesia, the trade mark again and be 0.5 kilogram of the coupling agent of KH-550,2 kilograms of nano level montmorillonites, powdered whiting stirs for 21 kilograms; Put into length at last and be 35 kilograms of long glass fibers more than 50 centimetres and roll dipping repeatedly with cylinder, it is fully impregnated until it to stir long glass fiber frequently; Then long glass fiber is pulled out and extracted, get the B layer material with flat board;
3) weight ratio by 4:6 weighs A layer and B layer material respectively; The B layer material is pressed the even place mat of radial interleaved mode in 135～150 ℃ mould, the A layer material is placed on the B layer material matched moulds and primer fluid press; Kept 7MPa pressure 7 minutes, the demoulding.
Embodiment 2
Each step is with embodiment 1; Wherein, The A layer material is formed by the preparation of raw material of following weight portion: 28 kilograms of unsaturated polyester resins, 0.18 kilogram in peroxidating uncle fourth fat, 4.5 kilograms of zinc stearates, 0.36 kilogram in magnesia, 0.5 kilogram of coupling agent, 1.7 kilograms of nano level montmorillonites, 8 kilograms of styrene, 4.1 kilograms of polystyrene, 28 kilograms of powdered whitings, 24 kilograms of staple glass fibres kept 4MPa pressure 15 minutes.
Embodiment 3
Each step is with embodiment 1; Wherein, the A layer material is formed by the preparation of raw material of following weight portion: 25 kilograms of unsaturated polyester resins, 0.18 kilogram in peroxidating uncle fourth fat, 4.5 kilograms of zinc stearates, 0.36 kilogram in magnesia, 0.5 kilogram of coupling agent, 1.7 kilograms of nano level montmorillonites, 8 kilograms of styrene, 4.1 kilograms of polystyrene, 34 kilograms of powdered whitings, 24 kilograms of staple glass fibres.Kept 6MPa pressure 11 minutes.
Claims (2)
1. BMC roving glass fiber moulded well covers; It is characterized in that solidifying through mould heat pressure by the weight ratio of 4:6 and be composited by A, B materials at two layers: with the even place mat of B layer material in 135～150 ℃ mould; Insert the A layer material then, matched moulds also keeps the pressure 7～15 minutes of 4～7MPa;
Said A layer material is formed by the preparation of raw material of following weight portion: unsaturated polyester resin 23～28, peroxidating uncle fourth fat 0.18, zinc stearate 4.5, magnesia 0.36, coupling agent 0.5, nanoscale montmorillonite 1.7, styrene 8, polystyrene 4.1, powdered whiting 28～40, length are 3 centimetres staple glass fibre 19～28; Its compound method is: styrene is mixed back heating for dissolving under 55～60 ℃ of conditions with polystyrene; Mix with unsaturated polyester resin then, add all the other each raw material stirring again and evenly integrate into dough;
Said B layer material is formed by the preparation of raw material of following weight portion: unsaturated polyester resin 25, peroxidating uncle fourth fat 0.18, zinc stearate 4.2, magnesia 0.36, coupling agent 0.5, nanoscale montmorillonite 2, styrene 7.8, polystyrene 3.9, powdered whiting 21, length are the long glass fiber 35 more than 50 centimetres; Its compound method is: styrene is mixed back heating for dissolving under 55～60 ℃ of conditions with polystyrene; Mix with unsaturated polyester resin then; Adding peroxidating uncle fourth fat, zinc stearate, magnesia, coupling agent, nanoscale montmorillonite, powdered whiting again stirs; Put into long glass fiber at last and roll dipping repeatedly with cylinder, the long glass fiber that will soak into is pulled out, is extracted.
2. BMC roving glass fiber moulded well covers according to claim 1 is characterized in that: said A layer material is formed by the preparation of raw material of following weight portion: unsaturated polyester resin 25, peroxidating uncle fourth fat 0.18, zinc stearate 4.5, magnesia 0.36, coupling agent 0.5, nanoscale montmorillonite 1.7, styrene 8, polystyrene 4.1, powdered whiting 34, staple glass fibre 24.
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| CN2011102177093A CN102359124A (en) | 2011-08-01 | 2011-08-01 | BMC (dough moulding compound) long glass fiber die pressing well cover |
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| CN2011102177093A CN102359124A (en) | 2011-08-01 | 2011-08-01 | BMC (dough moulding compound) long glass fiber die pressing well cover |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104805869A (en) * | 2015-04-30 | 2015-07-29 | 郑州翎羽新材料有限公司 | High-strength thermo-plastic fiber reinforced composite material well lid |
| CN106436876A (en) * | 2016-12-09 | 2017-02-22 | 天津市博安塑胶制品有限公司 | Resin-based polymer composite water grate and preparation method thereof |
| CN107418242A (en) * | 2017-08-03 | 2017-12-01 | 厦门金霆工贸有限公司 | DMC CF types high strength composites and its application in manhole cover |
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| KR20110048658A (en) * | 2009-11-03 | 2011-05-12 | 윤상구 | A drain cover |
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2011
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Patent Citations (7)
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| JPH08106806A (en) * | 1994-04-29 | 1996-04-23 | Basf Ag | Molded article that consists of bmc molding compounds with improved surface |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104805869A (en) * | 2015-04-30 | 2015-07-29 | 郑州翎羽新材料有限公司 | High-strength thermo-plastic fiber reinforced composite material well lid |
| CN106436876A (en) * | 2016-12-09 | 2017-02-22 | 天津市博安塑胶制品有限公司 | Resin-based polymer composite water grate and preparation method thereof |
| CN107418242A (en) * | 2017-08-03 | 2017-12-01 | 厦门金霆工贸有限公司 | DMC CF types high strength composites and its application in manhole cover |
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Application publication date: 20120222 |