CN102702560B - Compound foaming manufacturing method for polypropylene foaming material - Google Patents
Compound foaming manufacturing method for polypropylene foaming material Download PDFInfo
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- CN102702560B CN102702560B CN201210211968.XA CN201210211968A CN102702560B CN 102702560 B CN102702560 B CN 102702560B CN 201210211968 A CN201210211968 A CN 201210211968A CN 102702560 B CN102702560 B CN 102702560B
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 44
- -1 polypropylene Polymers 0.000 title claims abstract description 43
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 43
- 238000005187 foaming Methods 0.000 title claims abstract description 42
- 239000000463 material Substances 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 150000001875 compounds Chemical class 0.000 title abstract 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 17
- UIIMBOGNXHQVGW-UHFFFAOYSA-M NaHCO3 Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 12
- 239000011261 inert gas Substances 0.000 claims abstract description 12
- 239000007924 injection Substances 0.000 claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 12
- 229960003563 Calcium Carbonate Drugs 0.000 claims abstract description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 10
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 10
- 239000000155 melt Substances 0.000 claims abstract description 7
- 238000005516 engineering process Methods 0.000 claims abstract description 5
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims description 29
- 238000007664 blowing Methods 0.000 claims description 23
- 239000002131 composite material Substances 0.000 claims description 18
- 125000004805 propylene group Chemical class [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 16
- KRUCNVFZSLHJKU-UHFFFAOYSA-N [Si].OC(O)=O Chemical compound [Si].OC(O)=O KRUCNVFZSLHJKU-UHFFFAOYSA-N 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 239000006261 foam material Substances 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 6
- IJDNQMDRQITEOD-UHFFFAOYSA-N butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 5
- 239000001273 butane Substances 0.000 claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Chemical group O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 5
- 235000011089 carbon dioxide Nutrition 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000011343 solid material Substances 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims description 5
- 239000004033 plastic Substances 0.000 abstract description 9
- 229920003023 plastic Polymers 0.000 abstract description 9
- 239000004088 foaming agent Substances 0.000 abstract description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 abstract 1
- RDHFLXMETKTMPJ-UHFFFAOYSA-J silicon(4+);dicarbonate Chemical compound [Si+4].[O-]C([O-])=O.[O-]C([O-])=O RDHFLXMETKTMPJ-UHFFFAOYSA-J 0.000 abstract 1
- 239000006260 foam Substances 0.000 description 7
- 238000009413 insulation Methods 0.000 description 5
- 230000035939 shock Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000003139 buffering Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 238000004642 transportation engineering Methods 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The invention provides a compound foaming manufacturing method for a polypropylene foaming material and relates to a plastic foaming technology. The compound foaming manufacturing method comprises the following steps: uniformly mixing the following raw materials by weight part: 85-95 parts of polypropylene with high melt strength, 25-35 parts of silicon carbonate, 10-20 parts of calcium carbonate, 10-20 parts of sodium bicarbonate and 1-5 parts of PP (Polypropylene) master batch, and then putting into a hopper of a plastic extruding machine; increasing the temperature to 100-280 DEG C; plasticizing while mixing for 90-150min and chemically foaming; after uniformly melting and plasticizing the melt in the middle section of a barrel of the plastic extruding machine, injecting an inert gas foaming agent under a 8-15MPa condition, wherein the injection volume of the inert gas is 1-5% of the weight of the melt; keeping for 30-60min, reducing the pressure to the normal pressure, and physically foaming; and lastly, extruding the plasticized melt out of a T-shaped head opening mould, and rolling, thereby obtaining a compound foamed polypropylene sheet. The foaming power of the compound foamed polypropylene sheet can reach 5-15 times. The compound foamed polypropylene sheet has excellent anti-flaming heat-insulating property and excellent mechanical properties, such as tensile strength, and flexural strength.
Description
Technical field
The present invention relates to plastic foamed technology, particularly relate to a kind of composite foamed manufacture method of polypropylene foam material.
Background technology
Porous plastics has light weight, heat insulation, sound insulation, buffering, specific tenacity advantages of higher.Therefore in fields such as packing, industry, agricultural, communications and transportation, war industry, space industry and daily necessities, be used widely.The development of China's porous plastics since the nineties in 20th century is also very rapid, and principal item has that urethane (PU) is soft, rigid foam, polystyrene (Ps) and foam polyolefin material.Yet PU can produce harmful isocyanic ester residue in foaming process, can't recycle simultaneously; And the without putrefaction of foaming Ps products waste, the difficult recovery cause " white pollution ", the European Economic Community in 1991 has formulated enforceable " packing rule ", and the Ps that will foam lists " avoiding use " scope in.Environmental protection organization of United Nations has determined to stop in worldwide in 2005 to produce and has used foaming Ps.Now people adopt excellent performance, the expanded polypropylene (PP) being convenient to recycle replaces other foam materialss in a lot of fields.
Polypropylene is a kind of crystalline polymer, and its foaming can only be carried out near crystalline melt point, surpasses descend the rapidly melt strength of general purpose polypropylene resin of fusing point melt viscosity very low, and foaming is very difficult.The research of polypropylene expanded technology, develop and apply, become the focus that various countries pay close attention to.
Polypropylene expanded method can be divided into physical blowing and two kinds of methods of chemical foaming usually
Chemical blowing process is to utilize chemical process to produce gas to make plastic foamed: to adding chemical foaming agent in plastics heat to make it decomposition, discharge gas and foam; Also can utilize in addition the gas that between each plastic fraction, the generation chemical reaction discharges mutually and foam.The chemical foaming polypropylene foam can, by similar poly foam process, adopt common extrusion molding manufacture.Manufacturing process is relatively simple, but the polypropylene expanded multiplying power of chemical foaming is lower, generally can only reach 1 ~ 5 times.
Physical blowing method pneumatogen used is generally rare gas element as carbonic acid gas and nitrogen, or low-boiling point gas is as butane and pentane etc., and the polypropylene expanded multiplying power of physical blowing is higher, generally can reach 15 ~ 40 times.But it needs special-purpose whipping agent metering, pressurization and injected system, and technical difficulty is very large.
Summary of the invention
The object of the invention is in order to solve the polyacrylic deficiency of chemical foaming polypropylene and physical blowing, a kind of composite foamed method that provides chemical foaming and physical blowing to combine, expansion ratio can reach the composite foamed manufacture method of a kind of polypropylene foam material of 5 ~ 15 times.
The present invention, its manufacture method step is as follows:
(1) mix: by weight ratio by 85 ~ 95 parts of high melt strength, propylenes, 25 ~ 35 parts of carbonic acid silicon, 10 ~ 20 parts, calcium carbonate, 10 ~ 20 parts of sodium bicarbonates, 1 ~ 5 part of PP Masterbatch, drop in mixing machine and mix 20 ~ 30min, mixes;
(2) mixing: that the solid material mixed is dropped in the hopper of extruding machine, extruding machine is warming up to 100 ℃ ~ 280 ℃, restart the screw rod rotation of extruding machine, make high melt strength, propylene and the mixing 90 ~ 150min in plasticizing limit, other materials limit, carry out chemical foaming; In the stage casing of extruding machine cylindrical shell, after melt has melted plasticizing evenly, inject the inert gas blown agent under 8 ~ 15MPa condition, the rare gas element injection rate is 1 ~ 5% of melt weight, and injection rate is measured by volume pump, keeps 30 ~ 60min, be down to again normal pressure, carry out physical blowing;
(3) roll-in: by the melt slave plastified to the T connector die extrusion of 100 ℃ ~ 280 ℃, extruding the polypropylene foamed plate foamed flows in three roller gaps of plate squeezing unit, through being rolled into sheet material, naturally cooling, be cut into as required the sheet material of certain specification, and semifinished or finished goods.
The present invention's inert gas blown agent used is carbonic acid gas, nitrogen or butane.
Inert gas blown agent injection rate of the present invention is measured by volume pump.
The present invention's carbonic acid silicon used is properties-correcting agent, plays modifying function.
The present invention's calcium carbonate used is nucleator, plays nucleogenesis.
The present invention's sodium bicarbonate used is chemical foaming agent, plays the chemical foaming effect.
The present invention's Masterbatch used is tinting material, plays painted effect.
The composite foamed polypropylene expanded multiplying power that the present invention makes can reach 5 ~ 15 times, between chemical foaming and physical blowing, has the mechanical properties such as good anti-flaming thermal-insulation performance and good tensile strength, flexural strength.Can be widely used in the fields such as food product pack, buffering package, automotive upholstery, communications and transportation, building, industry.
Embodiment
Below in conjunction with embodiment, the present invention is described further.
Embodiment 1
(1) mix: by weight ratio by 90 parts of high melt strength, propylenes, 25 parts of carbonic acid silicon, 15 parts, calcium carbonate, 15 parts of sodium bicarbonates, 5 parts of PP Masterbatchs, in the mixing machine that the input model is SLD-1, mix 30min, mixes.
(2) mixing: the solid material mixed is dropped in the hopper of SHJ-92C extruding machine, and extruding machine is warming up to 200 ℃, restarts the screw rod rotation of extruding machine, makes high melt strength, propylene and the mixing 100min in plasticizing limit, other materials limit, carries out chemical foaming; In the stage casing of extruding machine cylindrical shell, after melt has melted plasticizing evenly, inject inert gas blown agent carbonic acid gas under the 12MPa condition, the rare gas element injection rate is measured as 5% of melt weight by volume pump, keeps 45min, then is down to normal pressure, carries out physical blowing;
(3) roll-in: by the melt slave plastified to the T connector die extrusion of 200 ℃, extruding the polypropylene foamed plate foamed flows in three roller gaps of plate squeezing unit, through being rolled into sheet material, naturally cooling, be cut into as required the sheet material of certain specification, and semifinished or finished goods.
Embodiment 2:
(1) mix: by weight ratio by 90 parts of high melt strength, propylenes, 25 parts of carbonic acid silicon, 10 parts, calcium carbonate, 20 parts of sodium bicarbonates, 5 parts of PP Masterbatchs, in the mixing machine that the input model is SLD-1, mix 30min, mixes.
(2) mixing: the solid material mixed is dropped in the hopper of SHJ-92C extruding machine, and extruding machine is warming up to 200 ℃, restarts the screw rod rotation of extruding machine, makes high melt strength, propylene and the mixing 100min in plasticizing limit, other materials limit, carries out chemical foaming; In the stage casing of extruding machine cylindrical shell, after melt has melted plasticizing evenly, inject inert gas blown agent nitrogen under the 12MPa condition, the rare gas element injection rate is measured as 5% of melt weight by volume pump, keeps 45min, then is down to normal pressure, carries out physical blowing;
(3) roll-in: by the melt slave plastified to the T connector die extrusion of 200 ℃, extruding the polypropylene foamed plate foamed flows in three roller gaps of plate squeezing unit, through being rolled into sheet material, naturally cooling, be cut into as required the sheet material of certain specification, and semifinished or finished goods.
Embodiment 3:
(1) mix: by weight ratio by 85 parts of high melt strength, propylenes, 20 parts of carbonic acid silicon, 10 parts, calcium carbonate, 20 parts of sodium bicarbonates, 5 parts of PP Masterbatchs, in the mixing machine that the input model is SLD-1, mix 30min, mixes.
(2) mixing: the solid material mixed is dropped in the hopper of SHJ-92C extruding machine, and extruding machine is warming up to 200 ℃, restarts the screw rod rotation of extruding machine, makes high melt strength, propylene and the mixing 100min in plasticizing limit, other materials limit, carries out chemical foaming; In the stage casing of extruding machine cylindrical shell, after melt has melted plasticizing evenly, inject inert gas blown agent butane under the 12MPa condition, the rare gas element injection rate is measured as 5% of melt weight by volume pump, keeps 45min, then is down to normal pressure, carries out physical blowing;
(3) roll-in: by the melt slave plastified to the T connector die extrusion of 200 ℃, extruding the polypropylene foamed plate foamed flows in three roller gaps of plate squeezing unit, through being rolled into sheet material, naturally cooling, be cut into as required the sheet material of certain specification, and semifinished or finished goods.
Embodiment 1, and embodiment 2, and the composite foamed expanded polypropylene material made of embodiment 3 is respectively composite foam material 1, composite foam material 2, and composite foam material 3, material thickness is 0.003 meter.Record each material property as following table with reference to the dependence test standard respectively.
Table one: three kinds of composite foamed polyacrylic performances
| Project name | Composite foam material 1 | Composite foam material 2 | Composite foam material 3 | Testing standard |
| Density (g/cm 3） | 0.108 | 0.079 | 0.086 | GB/T 1033 |
| Expansion ratio (doubly) | 8.5 | 11.8 | 10.6 | GB/T 1033 |
| Thermal conductivity (w/m.k) | 0.062 | 0.045 | 0.051 | GB/T 10295 |
| Thermal resistance (m 2.k）/w | 0.048 | 0.067 | 0.059 | GB/T 10295 |
| Tensile strength (MPa) | 14.8 | 15.2 | 16.7 | GB/T 1040 |
| Elongation at break (%) | 472.4 | 526.5 | 510.8 | GB/T 1040 |
| Flexural strength (MPa) | 15.4 | 16.3 | 17.6 | GB/T 9341 |
| Modulus in flexure (MPa) | 568.2 | 624.5 | 595.6 | GB/T 9341 |
| Shock strength (J/m) | 578.6 | 613.8 | 600.4 | GB/T 1043 |
For more composite foamed polypropylene and independent chemical foaming polypropylene and physical blowing polypropylene, chemical foaming and physical blowing test have been carried out respectively.Following form has been enumerated respectively the material property parameter of three chemical foamings and three physical blowing specific embodiments.
Chemical foaming embodiment mono-material component weight proportion is: 90 parts of high melt strength, propylenes, 20 parts of carbonic acid silicon, 10 parts, calcium carbonate, 15 parts of sodium bicarbonates
Chemical foaming embodiment bis-material component weight proportions are: 90 parts of high melt strength, propylenes, 15 parts of carbonic acid silicon, 15 parts, calcium carbonate, 20 parts of sodium bicarbonates
Chemical foaming embodiment tri-material component weight proportions are: 85 parts of high melt strength, propylenes, 25 parts of carbonic acid silicon, 10 parts, calcium carbonate, 20 parts of sodium bicarbonates
Three kinds of polyacrylic performances of chemical foaming of table two
| Project name | Chemical foaming material 1 | Chemical foaming material 2 | Chemical foaming material 3 | Testing standard |
| Density (g/cm 3） | 0.418 | 0.341 | 0.279 | GB/T 1033 |
| Expansion ratio (doubly) | 2.2 | 2.7 | 3.3 | GB/T 1033 |
| Thermal conductivity (w/m.k) | 0.078 | 0.074 | 0.071 | GB/T 10295 |
| Thermal resistance (m 2.k）/w | 0.038 | 0.041 | 0.042 | GB/T 10295 |
| Tensile strength (MPa) | 18.7 | 20.3 | 21.5 | GB/T 1040 |
| Elongation at break (%) | 658.6 | 694.5 | 702.3 | GB/T 1040 |
| Flexural strength (MPa) | 19.8 | 21.2 | 22.6 | GB/T 9341 |
| Modulus in flexure (MPa) | 694.8 | 712.5 | 728.8 | GB/T 9341 |
| Shock strength (J/m) | 613.6 | 648.4 | 682.7 | GB/T 1043 |
Physical blowing embodiment mono-material component weight proportion is: 90 parts of high melt strength, propylenes, and 25 parts of carbonic acid silicon, 5 parts of PP Masterbatchs, the inert gas blown agent is carbonic acid gas, injection rate is melt weight 5.
Physical blowing embodiment bis-material component weight proportions are: 85 parts of high melt strength, propylenes, and 20 parts of carbonic acid silicon, 5 parts of PP Masterbatchs, the inert gas blown agent is nitrogen, injection rate is melt weight 5.
Physical blowing embodiment tri-material component weight proportions are: 80 parts of high melt strength, propylenes, and 15 parts of carbonic acid silicon, 5 parts of PP Masterbatchs, the inert gas blown agent is butane, injection rate is melt weight 5.
Three kinds of polyacrylic performances of physical blowing of table three
| Project name | Physical foaming material 1 | Physical foaming material 2 | Physical foaming material 3 | Testing standard |
| Density (g/cm 3） | 0.058 | 0.051 | 0.046 | GB/T 1033 |
| Expansion ratio (doubly) | 16 | 18 | 20 | GB/T 1033 |
| Thermal conductivity (w/m.k) | 0.043 | 0.042 | 0.042 | GB/T 10295 |
| Thermal resistance (m 2.k）/w | 0.070 | 0.071 | 0.072 | GB/T 10295 |
| Tensile strength (MPa) | 0. 586 | 0.574 | 0.562 | GB/T 1040 |
| Elongation at break (%) | 280.8 | 276.6 | 275.5 | GB/T 1040 |
| Flexural strength (MPa) | 0.635 | 0.631 | 0.627 | GB/T 9341 |
| Modulus in flexure (MPa) | 386.2 | 375.4 | 372.8 | GB/T 9341 |
| Shock strength (J/m) | 413.5 | 408.6 | 395.2 | GB/T 1043 |
From table one, table two, table three, can find out, its expansion ratio of composite foamed polypropylene is higher than the chemical foaming polypropylene, but lower than the physical blowing polypropylene, therefore its anti-flaming thermal-insulation performance is higher than chemical foaming, and lower than physical blowing, but the mechanical properties such as tensile strength, flexural strength, shock strength are again higher than physical blowing, lower than chemical foaming.Therefore composite foamed polypropylene combines physical blowing polypropylene and the polyacrylic performance advantage of chemical foaming, possesses good anti-flaming thermal-insulation performance and mechanical property.
Claims (2)
1. the composite foamed manufacture method of a polypropylene foam material is characterized in that its manufacture method step is as follows:
Mix: by weight ratio by 85 ~ 95 parts of high melt strength, propylenes, 25 ~ 35 parts of carbonic acid silicon, 10 ~ 20 parts, calcium carbonate, 10 ~ 20 parts of sodium bicarbonates, 1 ~ 5 part of PP Masterbatch, drop in mixing machine and mix 20 ~ 30min, mixes;
Mixing: the solid material mixed is dropped in the hopper of extruding machine, and extruding machine is warming up to 100 ℃ ~ 280 ℃, restarts the screw rod rotation of extruding machine, makes high melt strength, propylene and the mixing 90 ~ 150min in plasticizing limit, other materials limit, carries out chemical foaming; In the stage casing of extruding machine cylindrical shell, after melt has melted plasticizing evenly, inject the inert gas blown agent under 8 ~ 15MPa condition, the rare gas element injection rate is 1 ~ 5% of melt weight, and injection rate is measured by volume pump, keeps 30 ~ 60min, be down to again normal pressure, carry out physical blowing;
Roll-in: by the melt slave plastified to the T connector die extrusion of 100 ℃ ~ 280 ℃, extruding the polypropylene foamed plate foamed flows in three roller gaps of plate squeezing unit, through being rolled into sheet material, naturally cooling, be cut into as required the sheet material of certain specification, and semifinished or finished goods.
2. the composite foamed manufacturing technology of a kind of polypropylene foam material according to claim 1, is characterized in that described rare gas element is carbonic acid gas, nitrogen or butane.
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| CN201210211968.XA CN102702560B (en) | 2012-06-26 | 2012-06-26 | Compound foaming manufacturing method for polypropylene foaming material |
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| CN201210211968.XA CN102702560B (en) | 2012-06-26 | 2012-06-26 | Compound foaming manufacturing method for polypropylene foaming material |
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| CN103435935A (en) * | 2013-08-23 | 2013-12-11 | 吴江市英力达塑料包装有限公司 | Polyvinyl chloride soft foam plastic and preparation method thereof |
| CN104817715A (en) * | 2015-04-17 | 2015-08-05 | 柳州蔚园塑料彩印包装有限责任公司 | Plastic food box preparation method |
| CN105037931A (en) * | 2015-07-06 | 2015-11-11 | 安徽成方新材料科技有限公司 | Foamed polypropylene-high molecular absorbent composite material capable of separating high temperature liquid, and preparation method thereof |
| CN105037930A (en) * | 2015-07-06 | 2015-11-11 | 安徽成方新材料科技有限公司 | Foamed polypropylene-high molecular absorbent composite material with uniform pore distribution, and preparation method thereof |
| CN108727846A (en) * | 2018-05-14 | 2018-11-02 | 湖州统装饰材料有限公司 | A kind of manufacture craft of wood-plastic board |
| CN109468106A (en) * | 2018-11-12 | 2019-03-15 | 重庆迅昌汽车零部件有限公司 | A kind of preparation method for the hot melt adhesive that foams |
| CN110343287A (en) * | 2019-07-19 | 2019-10-18 | 南京法宁格节能科技股份有限公司 | A kind of modified foaming polypropylene material and preparation method thereof for automobile instrument panel |
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| CN1944027A (en) * | 2005-10-09 | 2007-04-11 | 赖彪 | Compositely producing method for polypropylene foamed material and non-woven fabric |
| CN1944032A (en) * | 2005-10-09 | 2007-04-11 | 赖彪 | Method for producing polypropylene foamed sheet |
| CN101722689A (en) * | 2009-12-10 | 2010-06-09 | 重庆博邦汽车内饰件有限公司 | Micro-foamed composite board and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1944027A (en) * | 2005-10-09 | 2007-04-11 | 赖彪 | Compositely producing method for polypropylene foamed material and non-woven fabric |
| CN1944032A (en) * | 2005-10-09 | 2007-04-11 | 赖彪 | Method for producing polypropylene foamed sheet |
| CN101722689A (en) * | 2009-12-10 | 2010-06-09 | 重庆博邦汽车内饰件有限公司 | Micro-foamed composite board and manufacturing method thereof |
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