CN100446964C - Glass fiber reinforced macromolecule composite material well cover - Google Patents
Glass fiber reinforced macromolecule composite material well cover Download PDFInfo
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- CN100446964C CN100446964C CNB2003101175397A CN200310117539A CN100446964C CN 100446964 C CN100446964 C CN 100446964C CN B2003101175397 A CNB2003101175397 A CN B2003101175397A CN 200310117539 A CN200310117539 A CN 200310117539A CN 100446964 C CN100446964 C CN 100446964C
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- Prior art keywords
- weight
- glass
- polyester resin
- unsaturated polyester
- composite material
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000002131 composite material Substances 0.000 title claims abstract description 28
- 239000003365 glass fiber Substances 0.000 title claims abstract description 28
- 229920002521 macromolecule Polymers 0.000 title 1
- 239000000463 material Substances 0.000 claims abstract description 37
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229920006337 unsaturated polyester resin Polymers 0.000 claims abstract description 25
- 239000003292 glue Substances 0.000 claims abstract description 19
- 239000011521 glass Substances 0.000 claims description 31
- 229920000642 polymer Polymers 0.000 claims description 24
- 239000006004 Quartz sand Substances 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 150000001875 compounds Chemical class 0.000 claims description 12
- 239000000945 filler Substances 0.000 claims description 12
- 239000004575 stone Substances 0.000 claims description 9
- 150000008065 acid anhydrides Chemical class 0.000 claims description 7
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 239000003063 flame retardant Substances 0.000 claims description 6
- 230000003712 anti-aging effect Effects 0.000 claims description 5
- 239000001023 inorganic pigment Substances 0.000 claims description 5
- 229920002799 BoPET Polymers 0.000 claims description 4
- 239000005041 Mylar™ Substances 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 4
- 230000002708 enhancing effect Effects 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 150000001298 alcohols Chemical group 0.000 claims description 3
- 150000001990 dicarboxylic acid derivatives Chemical class 0.000 claims description 3
- 238000006068 polycondensation reaction Methods 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000010453 quartz Substances 0.000 abstract description 4
- 229920005989 resin Polymers 0.000 abstract description 4
- 239000011347 resin Substances 0.000 abstract description 4
- 230000035939 shock Effects 0.000 abstract description 3
- 239000011162 core material Substances 0.000 abstract 2
- 229920001187 thermosetting polymer Polymers 0.000 abstract 2
- 239000004570 mortar (masonry) Substances 0.000 abstract 1
- 229920001225 polyester resin Polymers 0.000 abstract 1
- 239000004645 polyester resin Substances 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- GEMHFKXPOCTAIP-UHFFFAOYSA-N n,n-dimethyl-n'-phenylcarbamimidoyl chloride Chemical group CN(C)C(Cl)=NC1=CC=CC=C1 GEMHFKXPOCTAIP-UHFFFAOYSA-N 0.000 description 3
- WFUGQJXVXHBTEM-UHFFFAOYSA-N 2-hydroperoxy-2-(2-hydroperoxybutan-2-ylperoxy)butane Chemical group CCC(C)(OO)OOC(C)(CC)OO WFUGQJXVXHBTEM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000011210 fiber-reinforced concrete Substances 0.000 description 2
- DXGLGDHPHMLXJC-UHFFFAOYSA-N oxybenzone Chemical compound OC1=CC(OC)=CC=C1C(=O)C1=CC=CC=C1 DXGLGDHPHMLXJC-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- OZHJEQVYCBTHJT-UHFFFAOYSA-N 1,2,3,4,5-pentabromo-6-methylbenzene Chemical compound CC1=C(Br)C(Br)=C(Br)C(Br)=C1Br OZHJEQVYCBTHJT-UHFFFAOYSA-N 0.000 description 1
- UICXTANXZJJIBC-UHFFFAOYSA-N 1-(1-hydroperoxycyclohexyl)peroxycyclohexan-1-ol Chemical compound C1CCCCC1(O)OOC1(OO)CCCCC1 UICXTANXZJJIBC-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- QHWKHLYUUZGSCW-UHFFFAOYSA-N Tetrabromophthalic anhydride Chemical compound BrC1=C(Br)C(Br)=C2C(=O)OC(=O)C2=C1Br QHWKHLYUUZGSCW-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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Abstract
The present invention relates to a composite-material manhole cover of glass fiber reinforced thermosetting resin group, particularly to a manhole cover which is formed from glass fiber for enhancement and polyester resin cementing quartz mortar bodies. The composite-material manhole cover of glass fiber reinforced thermosetting resin group is composed of an inner-core material collecting layer composed of collecting materials and functional filling materials, an outer-enhancement structure layer composed of glass fiber and a wear-resistant layer, wherein the outer-enhancement structure layer comprises 10% to 30% of glue solution A of unsaturated polyester resin and 3% to 15% of glass fiber B by weight ratio; the inner-core material collecting layer comprises 45% to 78% of collecting material C and 5% to 20% of filling material D; and the wear-resistant layer comprises 3% to 15% of wear-resistant material E. The present invention has the advantages of high compressive strength, high toughness and good shock resistance.
Description
Technical field
The present invention relates to a kind of glass-fiber reinforced thermo-setting resin base composite material manhole cover, especially a kind of well lid that forms with glass enhancing, the glued quartz sand slurry of mylar.
Background technology
Manhole cover with traditional material is made is easy to generate corrosion under field conditions (factors), and vehicle is through out-of-date easy generation noise.Modern highway, especially highway, vehicle flow is big, and heavy vehicle is many, and traditional manhole cover also is difficult to reach requirement aspect intensity, moreover is laid on manhole cover on the road stolen phenomenon that occurs repeatedly, and causes the damage accident of pedestrian and vehicle.Several years ago developed the steel fiber reinforced concrete manhole cover, its pressure-bearing effect surpasses the cast iron manhole cover of similar specification widely, can satisfy the requirement by heavy vehicle, does not produce noise, does not have and steals and sells value, can be antitheft.Steel fiber reinforced concrete manhole cover bearing strength height, but the fragility of material own is big, impact resistance is undesirable, and especially manhole cover and pavement joint place occur now and then and bump arrisdefect or crack phenomenon not at ordinary times in construction.
Summary of the invention
In order to improve and to overcome the existing existing problem of manhole cover, the invention provides a kind of quartz sand and gather materials, the resin base composite material manhole cover that functional stuffing strengthens with glass.It has very high compression strength, toughness, and shock resistance is good, can prevent that damaging and hitting in transportation, construction and use from splitting, and also can reach corrosion-resistant simultaneously, not produce noise, antitheft, according to user's the purpose painted, good looking appearance that requires.
Glass enhancement mode high polymer composite material manhole lid of the present invention comprises and being made up of outer enhancing structure sheaf and wearing layer that unsaturated polyester resin, glass fibre constitute the inner core aggregate lift of gathering materials, functional stuffing is formed that wearing layer comprises 3%-15% wear-resistant material E; It is characterized in that the outer structure sheaf that strengthens comprises that weight ratio is the unsaturated polyester resin glue A of 10%-30% and the glass fibre B of 3%-15%, the inner core aggregate lift comprises the filler D of gather materials C and the 5%-20% of 45%-78%.
1. mylar glue A comprises: unsaturated polyester resin, curing agent, promoter, antiaging agent, fire retardant, inorganic pigment mix;
2. glass fibre B comprises: glass cloth, glass fibers felt;
3. the C that gathers materials comprises: quartz sand, stone;
4. filler D is: talcum powder or compound brilliant fine;
5. wear-resistant material E is: quartz sand or wear-resisting sand.
Above-mentioned glass enhancement mode high polymer composite material manhole lid, the described outer structure sheaf that strengthens comprises that weight ratio is 15% unsaturated polyester resin glue A and 10% glass fibre B, the inner core aggregate lift comprises the filler D of 60% gather materials C and 12%, and wearing layer comprises 3% wear-resistant material E.
Above-mentioned glass enhancement mode high polymer composite material manhole lid, the described outer structure sheaf that strengthens also comprises talcum powder; The inner core aggregate lift also comprises unsaturated polyester resin glue A.
Above-mentioned glass enhancement mode high polymer composite material manhole lid, the described outer structure sheaf that strengthens also comprises compound brilliant fine; The heart aggregate lift also comprises compound brilliant fine; Wearing layer also comprises unsaturated polyester resin glue A.
Above-mentioned glass enhancement mode high polymer composite material manhole lid, described:
1. unsaturated polyester resin glue A comprises:
100 parts of (weight) mylar
0.5-10 part (weight) curing agent
0.5-10 part (weight) promoter
0.2-0.6 part (weight) antiaging agent
1-2 part (weight) fire retardant
0-0.1 part (weight) inorganic pigment mixes;
2. glass fibre B comprises:
85-95 part (weight) glass cloth
5-10 part (weight) glass fibers felt
3. the C that gathers materials comprises
20-150 part (weight) 40-60 purpose quartz sand
20-150 part (weight) 20-40 purpose quartz sand
5-30 part (weight) 2-4mm stone
5-30 part (weight) 6mm stone
4. filler D is a 600-1000 purpose talcum powder or compound brilliant fine
5. wear-resistant material E is 20-40 purpose quartz sand or wear-resisting sand.
Above-mentioned glass enhancement mode high polymer composite material manhole lid, described unsaturated polyester resin can be the polymer that unsaturated dibasic acid or acid anhydrides, monounsaturated dicarboxylic acid or acid anhydrides, dihydroxylic alcohols form through polycondensation reaction.
Above-mentioned glass enhancement mode high polymer composite material manhole lid, described fire retardant can be HBB or pentabromotoluene or chlorinated paraffin wax or magnesium hydroxide or tetrabromophthalic anhydride; Antiaging agent can be 2-hydroxyl-4-methoxy benzophenone or UV-531; Curing agent is methyl ethyl ketone peroxide or cyclohexanone peroxide; Promoter can be cobalt naphthenate or cobalt iso-octoate.
Above-mentioned glass enhancement mode high polymer composite material manhole lid, described compound brilliant fibre is a kind of mixture that comprises glass fibre and silica.
Above-mentioned glass enhancement mode high polymer composite material manhole lid, the mineral powder that described compound brilliant fibre is a kind of bisilicate, its composition comprises: SiO
225-70%, MgO 13-45%, CaO 11-30%, Fe
2O
30-1%.
Adopt the glass enhancement mode high polymer composite material manhole lid of above structure, prescription, have antitheft, very high compression strength, toughness, shock resistance is good, can prevent that damaging and hitting in transportation, construction and use from splitting, also can reach corrosion-resistant simultaneously, not produce noise, according to user's the purpose painted, good looking appearance that requires.
Description of drawings
Fig. 1 is the structural representation of glass enhancement mode high polymer composite material manhole lid of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is done detailed argumentation:
Glass enhancement mode high polymer composite material manhole lid of the present invention comprises and being made up of outer enhancing structure sheaf 2 and wearing layer 1 that unsaturated polyester resin, glass fibre constitute the heart aggregate lift 3 of gathering materials, functional stuffing is formed; The outer structure sheaf 2 that strengthens comprises that weight ratio is the unsaturated polyester resin glue A of 10%-30% and the glass fibre B of 3%-15%, and inner core aggregate lift 3 comprises the filler D of gather materials C and the 5%-20% of 45%-78%, and wearing layer 1 comprises 3%-15% wear-resistant material E.
Make manhole cover according to prescription of the present invention, operation sequence:
15% unsaturated polyester resin glue A, 10% glass fibre B, 60% the C that gathers materials, 12% filler D, 3% wear-resistant material E.
1. the polymer that forms through polycondensation reaction by 100 parts of (weight) unsaturated dibasic acids and acid anhydrides, monounsaturated dicarboxylic acid or acid anhydrides, dihydroxylic alcohols of unsaturated polyester resin glue A.
1.5 part (weight) methyl ethyl ketone peroxide
1.0 part (weight) cobalt naphthenate
0.3 part (weight) 2-hydroxyl-4-methoxy benzophenone
1.0 part (weight) fire retardant HBB
0.1 part (weight) inorganic pigment
Mix in the following ways: a adds cobalt naphthenate in unsaturated dibasic acid and acid anhydrides under general condition, stir
B adds other components successively
2. glass fibre B is by 85 parts of (weight) 04# glass cloth (thickness that is every layer of glass fabric is 0.4mm)
5 parts of (weight) 02# glass cloth
6 parts of (weight) glass mats
3. gather materials C by
150 parts of (weight) 40-60 purpose quartz sands
150 parts of (weight) 20-40 purpose quartz sands
50 parts of (weight) 10-20 purpose quartz sands
30 parts of (weight) 2-4mm stones
30 parts of (weight) 6mm stones
4. filler D is 80 parts (weight) 600 purpose talcum powder
5. wear-resistant material E is 30 parts of 20-40 purpose wear-resisting sands or quartz sand.
Glass enhancement mode high polymer composite material manhole lid operation sequence:
1. the cleaning of mould, the coated releasing agent
Mold cleaning is clean, and must not there be foreign material, dust, greasy dirt etc. in the surface, keeps dry, at the even coated releasing agent of die surface;
2. strengthening structure sheaf outward makes: claim the reinforcing material glass fibre by ratio requirement, unsaturated polyester resin glue A makes on the well lid bed die by production engineering specifications;
3. the heart aggregate lift is made:
Take by weighing inner core by ratio requirement and gather materials, filler, unsaturated polyester resin glue A evenly stirs, is inverted in the well lid bed die chamber, and vibration moulding, strickling is gathered materials;
4. wearing layer is made: take by weighing wear-resistant material and unsaturated polyester resin glue A, and evenly brushing on the mould of coated releasing agent, THICKNESS CONTROL is at 5-8mm;
5. matched moulds: just behind the gel, bed die and patrix are fastened at wearing layer;
6. the demoulding, finishing: can the demoulding under the situation of judging curing, be positioned on the conditioning beds again and repair:
7. solidify the back: be transported to the back and solidify the room and carry out back and solidify and handle after the product finishing finishes, curing is 12 hours after 60 ℃;
8. check, warehouse-in: by test stone, the product that has solidified is carried out outward appearance and mechanical properties test, qualified product is put into warehouse for finished product and is waited to dispatch from the factory.
The manhole cover of making according to prescription of the present invention, it is qualified to detect through the authoritative department South China Science ﹠ Engineering University of authorized by state, Central South University, building material product quality inspection station, Guangdong Province etc., and specific targets are as follows:
The bearing capacity of manhole cover made of composite material
Unit: KN
The fatigue behaviour of manhole cover made of composite material
| The manhole cover grade | Test lower limit load KN | Test upper limit load KN | Times of fatigue (ten thousand times) |
| A (thickness 35mm) | 50 | 140 | Be not less than 200 |
| B (thickness 30mm) | 35 | 65 | Be not less than 200 |
| C (thickness 25mm) | 25 | 50 | Be not less than 200 |
| D (thickness 20mm) | 20 | 35 | Be not less than 200 |
Claims (7)
1, glass enhancement mode high polymer composite material manhole lid, comprise by the inner core aggregate lift of gathering materials, functional stuffing is formed, be made up of outer enhancing structure sheaf and wearing layer that unsaturated polyester resin, glass fibre constitute, wearing layer comprises 3%-15% wear-resistant material (E) and unsaturated polyester resin glue (A); It is characterized in that the outer structure sheaf that strengthens comprises that weight ratio is the unsaturated polyester resin glue (A) of 10%-30% and the glass fibre (B) of 3%-15%, the inner core aggregate lift comprises filler (D), the unsaturated polyester resin glue (A) of gather materials (C) and the 5%-20% of 45%-78%;
1. mylar glue (A) comprising: unsaturated polyester resin, curing agent, promoter, antiaging agent, fire retardant, inorganic pigment mix;
2. glass fibre (B) comprising: glass cloth, glass fibers felt;
3. gather materials (C) comprising: quartz sand, stone;
4. filler (D) is: talcum powder or compound brilliant fine;
5. wear-resistant material (E) is: quartz sand or wear-resisting sand.
2. glass enhancement mode high polymer composite material manhole lid according to claim 1, it is characterized in that the outer structure sheaf that strengthens comprises that weight ratio is 15% unsaturated polyester resin glue (A) and 10% glass fibre (B), the heart aggregate lift comprises the filler (D) of 60% gather materials (C) and 12%, and wearing layer comprises 3% wear-resistant material (E).
3. glass enhancement mode high polymer composite material manhole lid according to claim 1 is characterized in that the outer structure sheaf that strengthens also comprises talcum powder and compound brilliant fine; The heart aggregate lift also comprises compound brilliant fine.
4. glass enhancement mode high polymer composite material manhole lid according to claim 1 is characterized in that:
1. unsaturated polyester resin glue (A) comprising:
100 parts of (weight) unsaturated polyester resins
0.5-10 part (weight) curing agent
0.5-10 part (weight) promoter
0.2-0.6 part (weight) antiaging agent
1-2 part (weight) fire retardant
0-0.1 part (weight) inorganic pigment mixes;
2. glass fibre (B) comprising:
85-95 part (weight) glass cloth
5-10 part (weight) glass fibers felt
3. gather materials (C) comprise
20-150 part (weight) 40-60 purpose quartz sand
10-50 part (weight) 20-40 purpose quartz sand
5-30 part (weight) 2-4mm stone
5-30 part (weight) 6mm stone
4. filler (D) is a 600-1000 purpose talcum powder or compound brilliant fine
5. wear-resistant material (E) is 20-40 purpose quartz sand or wear-resisting sand.
5. glass enhancement mode high polymer composite material manhole lid according to claim 4 is characterized in that unsaturated polyester resin can be the polymer that unsaturated dibasic acid or acid anhydrides, monounsaturated dicarboxylic acid or acid anhydrides, dihydroxylic alcohols form through polycondensation reaction.
6. glass enhancement mode high polymer composite material manhole lid according to claim 3 is characterized in that compound brilliant fibre is a kind of mixture that comprises glass fibre and silica.
7. glass enhancement mode high polymer composite material manhole lid according to claim 3 is characterized in that compound brilliant fibre is a kind of mineral powder of bisilicate, and its composition comprises: SiO
225-70%, MgO13-45%, CaO11-30%, Fe
2O
30-1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101175397A CN100446964C (en) | 2003-12-26 | 2003-12-26 | Glass fiber reinforced macromolecule composite material well cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101175397A CN100446964C (en) | 2003-12-26 | 2003-12-26 | Glass fiber reinforced macromolecule composite material well cover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1634698A CN1634698A (en) | 2005-07-06 |
| CN100446964C true CN100446964C (en) | 2008-12-31 |
Family
ID=34843613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101175397A Expired - Fee Related CN100446964C (en) | 2003-12-26 | 2003-12-26 | Glass fiber reinforced macromolecule composite material well cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100446964C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101906784A (en) * | 2010-08-09 | 2010-12-08 | 江苏普利匡聚合物材料有限公司 | Non-metal material reinforced unsaturated polyester resin manhole cover |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2464539B (en) * | 2008-10-20 | 2014-01-08 | Hexcel Composites Ltd | Composite Materials with Improved Sandability |
| CN104693370A (en) * | 2014-09-25 | 2015-06-10 | 临安巨丰城市配套设备有限公司 | Flake molding compound for manufacturing manhole cover and preparation method of flake molding compound |
| CN113737859B (en) * | 2021-08-27 | 2023-04-07 | 昆明理工大学 | Multi-layer die-pressing high-bearing municipal road well lid and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1083153A (en) * | 1993-09-02 | 1994-03-02 | 王洪顺 | New material drainage grate (water cover) and manufacture technology thereof |
| CN2498214Y (en) * | 2001-10-18 | 2002-07-03 | 曾建祥 | Composite drain covers |
-
2003
- 2003-12-26 CN CNB2003101175397A patent/CN100446964C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1083153A (en) * | 1993-09-02 | 1994-03-02 | 王洪顺 | New material drainage grate (water cover) and manufacture technology thereof |
| CN2498214Y (en) * | 2001-10-18 | 2002-07-03 | 曾建祥 | Composite drain covers |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101906784A (en) * | 2010-08-09 | 2010-12-08 | 江苏普利匡聚合物材料有限公司 | Non-metal material reinforced unsaturated polyester resin manhole cover |
| CN101906784B (en) * | 2010-08-09 | 2014-01-01 | 江苏普利匡聚合物材料有限公司 | Non-metal material reinforced unsaturated polyester resin manhole cover and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1634698A (en) | 2005-07-06 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081231 Termination date: 20161226 |