CN102702560A - Compound foaming manufacturing method for polypropylene foaming material - Google Patents
Compound foaming manufacturing method for polypropylene foaming material Download PDFInfo
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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 method of manufacture of PP foam material.
Background technology
Porous plastics has light weight, heat insulation, sound insulation, buffering, specific tenacity advantages of higher.Therefore be used widely in fields such as packing, industry, agricultural, communications and transportation, war industry, space industry and daily necessities.Also very rapidly, principal item has soft, the rigid foam of urethane (PU), PS (Ps) and foam polyolefin material in the development of China's porous plastics since the nineties in 20th century.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 ", and the European Economic Community in 1991 has formulated enforceable " packing rule ", and the Ps that will foam lists " avoiding the use of " scope in.Environmental protection organization of United Nations determined stop in the worldwide producing and use foaming Ps in 2005.This moment people adopt excellent performance, the expanded polypropylene (PP) being convenient to recycle replaces other foam materialss in a lot of fields.
Vestolen PP 7052 is a kind of crystalline polymer, and its foaming can only be carried out near crystalline melt point, and it is very low to surpass descend the rapidly melt strength of general purpose polypropylene resin of fusing point melt viscosity, and foaming is difficulty very.Polypropylene expanded Study on 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 chemicalfoaming usually
Chemical blowing process is to utilize chemical process to produce gas to make plastic foamed: heat to make it to decompose and discharge gas and foam adding chemical foaming agent in the plastics; Also can utilize in addition between each plastic fraction and the gas that chemical reaction discharges to take place each other and foam.The chemicalfoaming polypropylene foam can adopt common extrusion molding manufacturing by similar poly foam process.ME is simple relatively, but the polypropylene expanded multiplying power of chemicalfoaming is lower, generally can only reach 1 ~ 5 times.
The used pneumatogen of physical blowing method is generally rare gas element such as carbonic acid gas and nitrogen, or low-boiling point gas such 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 big.
Summary of the invention
The objective of the invention is in order to solve the polyacrylic deficiency of chemicalfoaming Vestolen PP 7052 and physical blowing; The composite foamed method that provides a kind of chemicalfoaming and physical blowing to combine, expansion ratio can reach the composite foamed method of manufacture of a kind of PP foam material of 5 ~ 15 times.
The present invention, its method of manufacture step is following:
(1) mix: by weight ratio with 85 ~ 95 parts of high melt strength, propylenes, 25 ~ 35 parts of carbonic acid silicon, 10 ~ 20 parts in lime carbonate, 10 ~ 20 parts of sodium hydrogencarbonates, 1 ~ 5 part of PP Masterbatch drops into and mixes 20 ~ 30min in the mixing machine, mixes;
(2) mixing: as the solid material that mixes to be 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 other materials while plastifying mixing 90 ~ 150min, carry out chemicalfoaming; In the stage casing of extruding machine cylindrical shell, after melt has melted plasticizing evenly, under 8 ~ 15MPa condition, inject the inert gas blown agent; The rare gas element IR is 1 ~ 5% of a melt weight, and IR keeps 30 ~ 60min through the volume pump metering; Reduce to normal pressure again, carry out physical blowing;
(3) roll-in: will plastify in the good melt slave and extrude to 100 ℃ ~ 280 ℃ T connector mouth mould; Extruding the polypropylene foamed plate that has foamed flows in the three roller slits of plate squeezing unit, through being rolled into sheet material, naturally cooling; Be cut into the sheet material of certain specification as required, and semifinished or finished goods.
The used inert gas blown agent of the present invention is carbonic acid gas, nitrogen or butane.
Inert gas blown agent IR of the present invention is through the volume pump metering.
The used carbonic acid silicon of the present invention is properties-correcting agent, plays modifying function.
The used lime carbonate of the present invention is nucleator, plays nucleogenesis.
The used sodium hydrogencarbonate of the present invention is a chemical foaming agent, plays the chemicalfoaming effect.
The used Masterbatch of the present invention is a tinting material, plays painted effect.
The composite foamed polypropylene expanded multiplying power that the present invention makes can reach 5 ~ 15 times, between chemicalfoaming and physical blowing, has good anti-flaming thermal-insulation performance and mechanical properties such as good tensile, flexural strength.Can be widely used in 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 done and to further describe.
Embodiment 1
(1) mix: by weight ratio with 90 parts of high melt strength, propylenes, 25 parts of carbonic acid silicon, 15 parts in lime carbonate, 15 parts of sodium hydrogencarbonates, 5 parts of PP Masterbatchs, dropping into model is in the mixing machine of SLD-1, mixes 30min, mixes.
(2) mixing: as the solid material that mixes to be dropped in the hopper of SHJ-92C extruding machine; Extruding machine is warming up to 200 ℃; Restart the screw rod rotation of extruding machine, make high melt strength, propylene and other materials while plastifying mixing 100min, carry out chemicalfoaming; In the stage casing of extruding machine cylindrical shell, after melt has melted plasticizing evenly, under the 12MPa condition, inject inert gas blown agent carbonic acid gas, the rare gas element IR is 5% of melt weight through the volume pump metering, keeps 45min, reduces to normal pressure again, carries out physical blowing;
(3) roll-in: will plastify in the good melt slave and extrude to 200 ℃ T connector mouth mould; Extruding the polypropylene foamed plate that has foamed flows in the three roller slits of plate squeezing unit, through being rolled into sheet material, naturally cooling; Be cut into the sheet material of certain specification as required, and semifinished or finished goods.
Embodiment 2:
(1) mix: by weight ratio with 90 parts of high melt strength, propylenes, 25 parts of carbonic acid silicon, 10 parts in lime carbonate, 20 parts of sodium hydrogencarbonates, 5 parts of PP Masterbatchs, dropping into model is in the mixing machine of SLD-1, mixes 30min, mixes.
(2) mixing: as the solid material that mixes to be dropped in the hopper of SHJ-92C extruding machine; Extruding machine is warming up to 200 ℃; Restart the screw rod rotation of extruding machine, make high melt strength, propylene and other materials while plastifying mixing 100min, carry out chemicalfoaming; In the stage casing of extruding machine cylindrical shell, after melt has melted plasticizing evenly, under the 12MPa condition, inject inert gas blown agent nitrogen, the rare gas element IR is 5% of melt weight through the volume pump metering, keeps 45min, reduces to normal pressure again, carries out physical blowing;
(3) roll-in: will plastify in the good melt slave and extrude to 200 ℃ T connector mouth mould; Extruding the polypropylene foamed plate that has foamed flows in the three roller slits of plate squeezing unit, through being rolled into sheet material, naturally cooling; Be cut into the sheet material of certain specification as required, and semifinished or finished goods.
Embodiment 3:
(1) mix: by weight ratio with 85 parts of high melt strength, propylenes, 20 parts of carbonic acid silicon, 10 parts in lime carbonate, 20 parts of sodium hydrogencarbonates, 5 parts of PP Masterbatchs, dropping into model is in the mixing machine of SLD-1, mixes 30min, mixes.
(2) mixing: as the solid material that mixes to be dropped in the hopper of SHJ-92C extruding machine; Extruding machine is warming up to 200 ℃; Restart the screw rod rotation of extruding machine, make high melt strength, propylene and other materials while plastifying mixing 100min, carry out chemicalfoaming; In the stage casing of extruding machine cylindrical shell, after melt has melted plasticizing evenly, under the 12MPa condition, inject inert gas blown agent butane, the rare gas element IR is 5% of melt weight through the volume pump metering, keeps 45min, reduces to normal pressure again, carries out physical blowing;
(3) roll-in: will plastify in the good melt slave and extrude to 200 ℃ T connector mouth mould; Extruding the polypropylene foamed plate that has foamed flows in the three roller slits of plate squeezing unit, through being rolled into sheet material, naturally cooling; Be cut into the sheet material of certain specification as required, and semifinished or finished goods.
Embodiment 1, and embodiment 2, and the embodiment 3 composite foamed expanded polypropylene materials that make are respectively composite foam material 1, and composite foam material 2, composite foam material 3, material thickness are 0.003 meter.Record each material property such 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 Vestolen PP 7052 and independent chemicalfoaming Vestolen PP 7052 and physical blowing Vestolen PP 7052, carried out the test of chemicalfoaming and physical blowing respectively.Following table has been enumerated the material property parameter of three chemicalfoamings and three physical blowing specific embodiments respectively.
Chemicalfoaming embodiment one material component weight proportion is: 90 parts of high melt strength, propylenes, 20 parts of carbonic acid silicon, 10 parts in lime carbonate, 15 parts of sodium hydrogencarbonates
Chemicalfoaming embodiment two material component weight proportions are: 90 parts of high melt strength, propylenes, 15 parts of carbonic acid silicon, 15 parts in lime carbonate, 20 parts of sodium hydrogencarbonates
Chemicalfoaming embodiment three material component weight proportions are: 85 parts of high melt strength, propylenes, 25 parts of carbonic acid silicon, 10 parts in lime carbonate, 20 parts of sodium hydrogencarbonates
Three kinds of polyacrylic performances of chemicalfoaming of table two
| Project name | Chemicalfoaming material 1 | Chemicalfoaming material 2 | Chemicalfoaming 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 one 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 a carbonic acid gas, IR is 5 of a melt weight.
Physical blowing embodiment two 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 a nitrogen, IR is 5 of a melt weight.
Physical blowing embodiment three 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 a butane, IR is 5 of a melt weight.
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 |
Can find out from table one, table two, table three; Its expansion ratio of composite foamed Vestolen PP 7052 is higher than the chemicalfoaming Vestolen PP 7052; But be lower than the physical blowing Vestolen PP 7052, so its anti-flaming thermal-insulation performance is higher than chemicalfoaming, and is lower than physical blowing; But mechanical properties such as tensile strength, flexural strength, shock strength are higher than physical blowing again, are lower than chemicalfoaming.Therefore composite foamed Vestolen PP 7052 combines physical blowing Vestolen PP 7052 and the polyacrylic performance advantage of chemicalfoaming, possesses good anti-flaming thermal-insulation performance and mechanical property.
Claims (2)
1. the composite foamed method of manufacture of a PP foam material is characterized in that its method of manufacture step is following:
Mix: by weight ratio with 85 ~ 95 parts of high melt strength, propylenes, 25 ~ 35 parts of carbonic acid silicon, 10 ~ 20 parts in lime carbonate, 10 ~ 20 parts of sodium hydrogencarbonates, 1 ~ 5 part of PP Masterbatch drops into and mixes 20 ~ 30min in the mixing machine, mixes;
Mixing: the solid material that mixes is dropped in the hopper of extruding machine, extruding machine is warming up to 100 ℃ ~ 280 ℃, restarts the screw rod rotation of extruding machine, make high melt strength, propylene and other materials while plastifying mixing 90 ~ 150min, carry out chemicalfoaming; In the stage casing of extruding machine cylindrical shell, after melt has melted plasticizing evenly, under 8 ~ 15MPa condition, inject the inert gas blown agent; The rare gas element IR is 1 ~ 5% of a melt weight, and IR keeps 30 ~ 60min through the volume pump metering; Reduce to normal pressure again, carry out physical blowing;
Roll-in: will plastify in the good melt slave and extrude to 100 ℃ ~ 280 ℃ T connector mouth mould; Extruding the polypropylene foamed plate that has foamed flows in the three roller slits of plate squeezing unit, through being rolled into sheet material, naturally cooling; Be cut into the sheet material of certain specification as required, and semifinished or finished goods.
2. the composite foamed manufacturing technology of a kind of PP 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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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| 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 |
| 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 |
| 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 |
| CN112724505A (en) * | 2020-12-25 | 2021-04-30 | 海信（广东）空调有限公司 | Composite foaming material for exhaust pipe of mobile air conditioner, exhaust pipe and mobile air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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| CN112724505A (en) * | 2020-12-25 | 2021-04-30 | 海信（广东）空调有限公司 | Composite foaming material for exhaust pipe of mobile air conditioner, exhaust pipe and mobile air conditioner |
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