CN103524821A - Polyethylene foam plastic and preparation method thereof - Google Patents
Polyethylene foam plastic and preparation method thereof Download PDFInfo
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- CN103524821A CN103524821A CN201310242630.5A CN201310242630A CN103524821A CN 103524821 A CN103524821 A CN 103524821A CN 201310242630 A CN201310242630 A CN 201310242630A CN 103524821 A CN103524821 A CN 103524821A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
- B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/60—Measuring, controlling or regulating
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/08—Supercritical fluid
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
Abstract
The invention relates to a polyethylene foam plastic which is prepared from polyethylene, a nucleating agent, an assistant and supercritical carbon dioxide, wherein the nucleating agent accounts for 0.2-0.8% of total mass of the polyethylene; the assistant accounts for 0.1-0.6% of total mass of the polyethylene; the supercritical carbon dioxide accounts for 5-30% of total mass of the polyethylene. The invention also relates to a preparation method of the polyethylene foam plastic. Plastic melt extruded by a screw extruder is transported to a foaming opening mold to foam and extrude by adopting a melt pump, a static mixer and a dynamic mixer, so that effective transportation of the plastic melt is ensured, the supercritical carbon dioxide and the assistant are evenly dispersed in the plastic melt, and the foaming uniformity of the product is improved. The polyethylene foam plastic is produced by the supercritical carbon dioxide instead of butane in a foaming manner; the preparation method is simple and feasible; potential safety hazards in the production process of extruded polyethylene foam plastic are solved; green and environmental protection effects and safe foaming are achieved; the production cost is reduced; the quality is also greatly improved.
Description
Technical field
The present invention relates to extruding macromolecular porous plastics technical field, be specifically related to adopt supercritical carbon dioxide foaming extruded polyethylene porous plastics and preparation method thereof.
Background technology
Along with the high speed development of China's economic construction, the equipment configurations such as a large amount of high-grade, precision and advanced electronicss, opticinstrument, instrument appliance, require the packing that quality is high, protective value is good.The fields such as the railway meanwhile, matching with the transportation of the said products, navigation, aviation, highway packed and transported are also starved of the protecting materials of excellent property.Extruded polyethylene porous plastics is owing to having good heat insulating ability and heat retaining property, and good shock-absorbing capacity is lightweight and have flexibility, the advantage such as recyclable, is widely used at present various packaging fields.
Domestic extruded polyethylene foam production technique is all made whipping agent with butane at present, because butane is inflammable organic gas, can form explosive mixture with air mixed, and heat source and naked light have the danger of combustion explosion; Butane contacts fierce reaction with oxygenant, butane is heavier than air, and can be diffused in lower place quite far away, and chance burning things which may cause a fire disaster can catch fire and strile-back, and the production link of polyethylene foam plastics has been proposed to higher safety requirements.In addition, use the polyethylene foams of butane foaming to deposit about one month at storehouse, the butane that just can make to remain in porous plastics is further escaped out, and this equally also makes to store link and also very easily forms explosibility atmosphere, to storing link, has also proposed higher safety requirements.Domestic polyethylene extrusioning plastics manufacturer, has many cases that cause very big loss because of During Combustion of Butane blast every year.Therefore, finding foaming agent and technique, become the world-famous puzzle of the sector, be primary selection, but this technical difficulty greatly not yet makes a breakthrough very much at present and adopt at present the supercritical co with environment-friendly type to substitute butane as whipping agent.
Supercritical carbon dioxide foaming technology is developed by Italian Kang Long group the earliest.Supercritical co state
Refer to that under this state, properties of carbon dioxide is between liquid state and gaseous state when carbonic acid gas is 30.5 ℃ of temperature, more than pressure 7.37MPa residing state is supercritical state.Supercritical co has the density of approximate liquid and the viscosity of gas, polymer melt is had to good plastification, can reduce the viscosity of polymer melt, improve the mobility of melt, reduce extrusion temperature, as whipping agent, be mainly used in the microporous foam of plastics.It is zero-sum foaming efficiency advantages of higher that supercritical co has nontoxic, non-combustible, ODP as whipping agent.In addition, carbonic acid gas is industrial byproduct, does not need extra production, can not cause environmental pollution.The foam that supercritical carbon dioxide foaming makes has higher cell density, can obtain the porous plastics of high-quality.
Although carbonic acid gas has uninflammability, atmosphere pollution not, the feature of the desirable whipping agent that cost is low, but because the volatility of carbonic acid gas is very big, vapour pressure is high again, this whipping agent is difficult use extremely, through extruded polyethylene foam production producer, attempt using, in existing equipment, supercritical carbon dioxide foaming agent often makes porous plastics in foams, form abscess, surface imperfection (as crackle) and the fold interrupting, make the variation in thickness in foams sheet, this all causes the size of foam surface undesirable, thereby affects intensity and the outward appearance of foams.
Summary of the invention
The invention provides a kind of polyethylene foams and preparation method thereof, adopt supercritical co to substitute butane whipping agent, solved the potential safety hazard existing in extruded polyethylene foam production process, reduced environmental pollution; And reduced production cost.
Concrete technical scheme of the present invention is as follows:
, by polyethylene, nucleator, auxiliary agent, supercritical co, be prepared from;
Described nucleator accounts for 2 ‰ of polyethylene total mass ~ 8 ‰, and auxiliary agent accounts for 1 ‰ of polyethylene total mass ~ 6 ‰, and supercritical co accounts for 5% ~ 30% of polyethylene total mass;
Described nucleator is selected from a kind of in calcium carbonate, calcium sulfate, talcum powder;
Described auxiliary agent is selected from a kind of in polydimethylsiloxane, mineral oil, glyceryl monostearate.
For nucleator, when identical nucleation ability, diameter is less, and nucleator consumption is fewer; When identical nucleator consumption, diameter is less, and the quantity of nucleation abscess is more, better to the homogeneity of abscess, and the cell uniformity of product also can be better; So consider from the cell uniformity of cost aspect and product, preferred, the particle diameter of described nucleator is less than 10 μ m.
The present invention also provides the preparation method of polyethylene foams, comprises the steps:
(1) by nucleator and polyethylene feeding screw extrusion press, through screw extrusion press, extrude formation plastic melt, the pressure in screw extrusion press is 5MPa ~ 10MPa, and temperature is 80 ℃ ~ 200 ℃;
(2) plastic melt is exported in the first static mixer by Melt Pump pressurization, and the output pressure of Melt Pump is 15 MPa ~ 30 MPa, and plastic melt fully mixes in the first static mixer with auxiliary agent and supercritical co;
(3) from the first static mixer plastic melt out, enter foaming mouthful mould successively through dynamic mixer, the second static mixer after mixing, through foaming, extrude formation foam, the temperature at foaming mouthful mould place is 80 ℃ ~ 110 ℃, and pressure is 8 MPa ~ 12 MPa; ;
(4) foam obtains polyethylene foams finished product through cooling, expansion, sizing, traction, rolling.
Described screw extrusion press is single screw extrusion machine, and its screw slenderness ratio is 25/1 ~ 35/1; The present invention is made as 25/1 ~ 35/1 by screw slenderness ratio, and single screw extrusion machine just plays plastification, and other mixing effect and pressure-raising effect give static mixer, dynamic mixer and Melt Pump to complete.
More even for what nucleator and polyethylene were mixed, the homogeneity of assurance abscess; In step (1), nucleator and polyethylene are respectively by screw feeder feeding screw extrusion press.
During due to the thicker sheet material of production or section bar, a foaming mouthful mould place does not need large internal pressure, so Melt Pump can be away from a foaming mouthful mould position, aforesaid method is particularly useful for preparing sheet material or the section bar that thickness is greater than 10mm, and effect is also relatively good.
The present invention also provides the preparation method of polyethylene foams, comprises the steps:
(1) by nucleator and polyethylene feeding screw extrusion press, through screw extrusion press, extrude formation plastic melt, the pressure in screw extrusion press is 5MPa ~ 10MPa, and temperature is 80 ℃ ~ 200 ℃;
(2) plastic melt is sent in the first static mixer, after fully mixing, by Melt Pump pressurization, exported in dynamic mixer with auxiliary agent and supercritical co in the first static mixer, the output pressure of Melt Pump is 15 MPa ~ 30 MPa;
(3) through the mixed plastic melt of dynamic mixer, enter in the second static mixer and mix, then enter foaming mouthful mould, through foaming, extrude formation foam, the temperature at foaming mouthful mould place is 80 ℃ ~ 110 ℃, and pressure is 8 MPa ~ 12 MPa;
(4) foam obtains polyethylene foams finished product through cooling, expansion, sizing, traction, rolling.
Described screw extrusion press is single screw extrusion machine, and its screw slenderness ratio is 25/1 ~ 35/1; The present invention is made as 25/1 ~ 35/1 by screw slenderness ratio, and single screw extrusion machine just plays plastification, and other mixing effect and pressure-raising effect give static mixer, dynamic mixer and Melt Pump to complete.
More even for what nucleator and polyethylene were mixed, the homogeneity of assurance abscess; In step (1), nucleator and polyethylene are respectively by screw feeder feeding screw extrusion press.
During due to the thin sheet material of production or section bar, foaming mouthful mould place needs larger internal pressure, so Melt Pump will be more close foaming mouthful mould position, aforesaid method is adjusted the first static mixer and Melt Pump order, be particularly useful for preparing sheet material or the section bar that thickness is not more than 10mm, and effect is also relatively good.
The present invention is in preparing polyethylene foams, adopt supercritical co to replace butane, and the plastic melt that adopts Melt Pump, static mixer, dynamic mixer that screw extrusion press is extruded is delivered to a foaming mouthful mould foaming and extrudes, guaranteed effective conveying of plastic melt, supercritical co and auxiliary agent are obtained in plastic melt dispersed, improved the homogeneity of product foaming.The present invention substitutes butane foam production extruded polyethylene porous plastics with supercritical co, technique is simple, solved in extruded polyethylene foam production process and the potential safety hazard existing in follow-up storage, realize environmental protection, safety foaming, reduced environmental pollution; And reduced production cost; Quality is also greatly improved.
Accompanying drawing explanation
Fig. 1 is the present invention program one process flow sheet;
Fig. 2 is the present invention program one process flow sheet.
Embodiment
The present invention is not subject to the restriction of following embodiment, can determine concrete embodiment according to technical scheme of the present invention and practical situation.
The screw feeder using in the present invention, single screw extrusion machine, net-changing device, Melt Pump, the first static mixer, dynamic mixer, the second static mixer, foaming mouthful mould, topping-up pump are all existing; Wherein the first static mixer is identical with the second static mixer.
Below in conjunction with embodiment and accompanying drawing, the present invention is further described.
embodiment 1
As shown in Figure 1, a kind of preparation method of polyethylene foams, comprises the steps:
(1) calcium carbonate and the polyethylene that account for polyethylene total mass 2 ‰ are fed in single screw extrusion machine by screw feeder respectively, through screw extrusion press, extrude formation plastic melt, the length-to-diameter ratio of single screw extrusion machine is that the pressure in 30/1 single screw extrusion machine is 10MPa, and temperature is 120 ℃;
(2) cross-head is connected with Melt Pump by net-changing device, and plastic melt is exported in the first static mixer by Melt Pump pressurization, and the output pressure of Melt Pump is 15 MPa; To account for the polydimethylsiloxane of polyethylene total mass 3 ‰ and account for polyethylene total mass 20% supercritical co respectively in topping-up pump is delivered to the first static mixer, plastic melt fully mixes in the first static mixer with polydimethylsiloxane and supercritical co;
(3) from the first static mixer plastic melt out, enter foaming mouthful mould successively through dynamic mixer, the second static mixer after mixing, through foaming, extrude formation foam, the temperature at foaming mouthful mould place is 110 ℃, and pressure is 10 MPa;
(4) foam obtains polyethylene foams finished product through cooling, expansion, sizing, traction, rolling.
embodiment 2
As shown in Figure 1, a kind of preparation method of polyethylene foams, comprises the steps:
(1) calcium sulfate and the polyethylene that account for polyethylene total mass 2 ‰ are fed in single screw extrusion machine by screw feeder respectively, through screw extrusion press, extrude formation plastic melt, the length-to-diameter ratio of single screw extrusion machine is that the pressure in 25/1 single screw extrusion machine is 8MPa, and temperature is 80 ℃;
(2) cross-head is connected with Melt Pump by net-changing device, and plastic melt is exported in the first static mixer by Melt Pump pressurization, and the output pressure of Melt Pump is 30 MPa; By the supercritical co that accounts for the mineral oil of polyethylene total mass 6 ‰ and account for polyethylene total mass 7%, respectively in topping-up pump is delivered to the first static mixer, plastic melt fully mixes in the first static mixer with polydimethylsiloxane and supercritical co;
(3) from the first static mixer plastic melt out, enter foaming mouthful mould successively through dynamic mixer, the second static mixer after mixing, through foaming, extrude formation foam, the temperature at foaming mouthful mould place is 90 ℃, and pressure is 8 MPa;
(4) foam obtains polyethylene foams finished product through cooling, expansion, sizing, traction, rolling.
embodiment 3
As shown in Figure 2, a kind of preparation method of polyethylene foams, comprises the steps:
(1) talcum powder and the polyethylene that account for polyethylene total mass 2 ‰ are fed in single screw extrusion machine by screw feeder respectively, through screw extrusion press, extrude formation plastic melt, the length-to-diameter ratio of single screw extrusion machine is that the pressure in 35/1 single screw extrusion machine is 5MPa, and temperature is 200 ℃;
(2) cross-head is connected with the first static mixer by net-changing device, plastic melt exports in the first static mixer, by the supercritical co that accounts for the glyceryl monostearate of polyethylene total mass 2 ‰ and account for polyethylene total mass 30%, respectively in topping-up pump is delivered to the first static mixer, plastic melt fully mixes in the first static mixer with polydimethylsiloxane and supercritical co; Then by Melt Pump pressurization, exported in dynamic mixer and mixed, the output pressure of Melt Pump is 15 MPa;
3) through the mixed plastic melt of dynamic mixer, enter the second static mixer and mix, then enter foaming mouthful mould, through foaming, extrude formation foam, the temperature at foaming mouthful mould place is 80 ℃, and pressure is 12 MPa;
(4) foam obtains polyethylene foams finished product through cooling, expansion, sizing, traction, rolling.
embodiment 4
As shown in Figure 2, a kind of preparation method of polyethylene foams, comprises the steps:
(1) calcium carbonate and the polyethylene that account for polyethylene total mass 2 ‰ are fed in single screw extrusion machine by screw feeder respectively, through screw extrusion press, extrude formation plastic melt, the length-to-diameter ratio of single screw extrusion machine is that the pressure in 30/1 single screw extrusion machine is 8MPa, and temperature is 150 ℃;
(2) cross-head is connected with the first static mixer by net-changing device, plastic melt exports in the first static mixer, to account for the polydimethylsiloxane of polyethylene total mass 5 ‰ and account for polyethylene total mass 8% supercritical co respectively in topping-up pump is delivered to the first static mixer, plastic melt fully mixes in the first static mixer with polydimethylsiloxane and supercritical co; Then by Melt Pump pressurization, exported in dynamic mixer and mixed, the output pressure of Melt Pump is 20 MPa;
3) through the mixed plastic melt of dynamic mixer, enter the second static mixer and mix, then enter foaming mouthful mould, through foaming, extrude formation foam, the temperature at foaming mouthful mould place is 100 ℃, 9 MPa;
(4) foam obtains polyethylene foams finished product through cooling, expansion, sizing, traction, rolling.
The polyethylene foams finished product that the present invention prepares is mainly used in the packing of product, as the packing of the equipment configurations such as electronics, opticinstrument, instrument appliance; So polyethylene foams end properties is mainly to see outward appearance, whether the abscess, surface that sees if there is interruption defectiveness (as crackle) and fold, for other performances, there is no special requirement.
The outward appearance of the polyethylene foams below embodiment 1 to embodiment 4 being obtained adopts the method for range estimation to detect, and concrete outcome is in Table 1.
The performance data of each embodiment of table 1
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 |
| Polyethylene foams thickness (mm) | 20 | 30 | 2 | 5 |
| The abscess that whether has interruption | Nothing | Nothing | Nothing | Nothing |
| Whether surface defectiveness | Nothing | Nothing | Nothing | Nothing |
As can be seen from Table 1, the finished product that adopts the present invention to prepare, its outward appearance meets the service requirements of existing polyethylene foams, can replace existing polyethylene foams to use.
Claims (10)
1. a polyethylene foams, is characterized in that being prepared from by polyethylene, nucleator, auxiliary agent, supercritical co;
Described nucleator accounts for 2 ‰ of polyethylene total mass ~ 8 ‰, and auxiliary agent accounts for 1 ‰ of polyethylene total mass ~ 6 ‰, and supercritical co accounts for 5% ~ 30% of polyethylene total mass;
Described nucleator is selected from a kind of in calcium carbonate, calcium sulfate, talcum powder;
Described auxiliary agent is selected from a kind of in polydimethylsiloxane, mineral oil, glyceryl monostearate.
2. polyethylene foams according to claim 1, is characterized in that the particle diameter of described nucleator is less than 10 μ m.
3. the preparation method of the polyethylene foams described in claim 1 to 2, is characterized in that comprising the steps:
(1) by nucleator and polyethylene feeding screw extrusion press, through screw extrusion press, extrude formation plastic melt, the pressure in screw extrusion press is 5MPa ~ 10MPa, and temperature is 80 ℃ ~ 200 ℃;
(2) plastic melt is exported in the first static mixer by Melt Pump pressurization, and the output pressure of Melt Pump is 15 MPa ~ 30 MPa, and plastic melt fully mixes in the first static mixer with auxiliary agent and supercritical co;
(3) from the first static mixer plastic melt out, enter foaming mouthful mould successively through dynamic mixer, the second static mixer after mixing, through foaming, extrude formation foam, the temperature at foaming mouthful mould place is 80 ℃ ~ 110 ℃, and pressure is 8 MPa ~ 12 MPa;
(4) foam obtains polyethylene foams finished product through cooling, expansion, sizing, traction, rolling.
4. preparation method according to claim 3, is characterized in that described screw extrusion press is single screw extrusion machine, and its screw slenderness ratio is 25/1 ~ 35/1.
5. according to the preparation method described in claim 3 or 4, it is characterized in that the middle nucleator of step (1) and polyethylene are respectively by screw feeder feeding screw extrusion press.
6. preparation method according to claim 5, is characterized in that the method is greater than sheet material or the section bar of 10mm for the preparation of thickness.
7. the preparation method of the polyethylene foams described in claim 1 to 2, is characterized in that comprising the steps:
(1) by nucleator and polyethylene feeding screw extrusion press, through screw extrusion press, extrude formation plastic melt, the pressure in screw extrusion press is 5MPa ~ 10MPa, and temperature is 80 ℃ ~ 200 ℃;
(2) plastic melt is sent in the first static mixer, after fully mixing, by Melt Pump pressurization, exported in dynamic mixer with auxiliary agent and supercritical co in the first static mixer, the output pressure of Melt Pump is 15 MPa ~ 30 MPa;
(3) through the mixed plastic melt of dynamic mixer, enter in the second static mixer and mix, then enter foaming mouthful mould, through foaming, extrude formation foam, the temperature at foaming mouthful mould place is 80 ℃ ~ 110 ℃, and pressure is 8 MPa ~ 12 MPa;
(4) foam obtains polyethylene foams finished product through cooling, expansion, sizing, traction, rolling.
8. preparation method according to claim 7, is characterized in that described screw extrusion press is single screw extrusion machine, and its screw slenderness ratio is 25/1 ~ 35/1.
9. according to the preparation method described in claim 7 or 8, it is characterized in that the middle nucleator of step (1) and polyethylene are respectively by screw feeder feeding screw extrusion press.
10. preparation method according to claim 9, is characterized in that the method is not more than sheet material or the section bar of 10mm for the preparation of thickness.
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| CN201310242630.5A CN103524821A (en) | 2013-06-19 | 2013-06-19 | Polyethylene foam plastic and preparation method thereof |
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| CN201310242630.5A CN103524821A (en) | 2013-06-19 | 2013-06-19 | Polyethylene foam plastic and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108164853A (en) * | 2018-01-29 | 2018-06-15 | 厦门派探特环保科技有限公司 | A kind of novel environment friendly expanded material and preparation method thereof and foam process |
| CN108473732A (en) * | 2015-12-03 | 2018-08-31 | 陶氏环球技术有限责任公司 | high porosity microporous polyethylene |
| CN108560063A (en) * | 2018-02-07 | 2018-09-21 | 浙江千禧龙纤特种纤维股份有限公司 | A kind of UHMWPE Fibrinolysis and calendering process |
| CN108948478A (en) * | 2018-04-27 | 2018-12-07 | 厦门谱睿科技有限公司 | A kind of Pearl wool material of supercritical carbon dioxide foaming |
| CN109591242A (en) * | 2018-10-22 | 2019-04-09 | 安徽荣茂塑胶包装材料有限公司 | A kind of energy-efficient overcritical foamed moulding process of EPE |
| CN110667029A (en) * | 2019-10-28 | 2020-01-10 | 福州友星生物科技有限公司 | EVA foaming equipment applying supercritical carbon dioxide and process method thereof |
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| CN102295807A (en) * | 2011-09-05 | 2011-12-28 | 浙江俊尔新材料有限公司 | Extrusion expanded polypropylene beads and preparation method thereof |
| CN102775671A (en) * | 2012-08-23 | 2012-11-14 | 苏州九鼎珍珠棉有限公司 | Modified polyethylene for supercritical CO2 foaming and preparation method thereof |
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| CN101565550A (en) * | 2009-03-31 | 2009-10-28 | 北京中拓机械有限责任公司 | Nucleating agent master batches used for foaming of thermoplastic resin |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108473732A (en) * | 2015-12-03 | 2018-08-31 | 陶氏环球技术有限责任公司 | high porosity microporous polyethylene |
| CN108473732B (en) * | 2015-12-03 | 2021-03-19 | 陶氏环球技术有限责任公司 | High porosity microporous polyethylene |
| CN108164853A (en) * | 2018-01-29 | 2018-06-15 | 厦门派探特环保科技有限公司 | A kind of novel environment friendly expanded material and preparation method thereof and foam process |
| CN108560063A (en) * | 2018-02-07 | 2018-09-21 | 浙江千禧龙纤特种纤维股份有限公司 | A kind of UHMWPE Fibrinolysis and calendering process |
| CN108948478A (en) * | 2018-04-27 | 2018-12-07 | 厦门谱睿科技有限公司 | A kind of Pearl wool material of supercritical carbon dioxide foaming |
| CN109591242A (en) * | 2018-10-22 | 2019-04-09 | 安徽荣茂塑胶包装材料有限公司 | A kind of energy-efficient overcritical foamed moulding process of EPE |
| CN110667029A (en) * | 2019-10-28 | 2020-01-10 | 福州友星生物科技有限公司 | EVA foaming equipment applying supercritical carbon dioxide and process method thereof |
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Application publication date: 20140122 |