CN1398718A - Production process of low-density foamed polyethylene - Google Patents
Production process of low-density foamed polyethylene Download PDFInfo
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- CN1398718A CN1398718A CN 01123483 CN01123483A CN1398718A CN 1398718 A CN1398718 A CN 1398718A CN 01123483 CN01123483 CN 01123483 CN 01123483 A CN01123483 A CN 01123483A CN 1398718 A CN1398718 A CN 1398718A
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Abstract
A low-density polyethylene film or tube after being foamed and expanded has excellent floating and heat insulating performances. The production process of the film or tube includes mixing low-density polyethylene with foaming agent, surfactant and stripping agent; heating the mixture at different temperatures for smelting the mixture, gasifying the foaming agent to expand polyethylene molecules, cooling the melt to harden and shrink partially expanded molecules, introducing another gaseous foaming agent for further expansion, cutting, extruding, cooling the expanded material to form the film or tube. The said process may be used in producing the lining material for sports suit, business suit, army uniform, etc.
Description
The present invention relates to the production method of a kind of production method of polyethylene foamed, particularly low-density foamed polyethylene.
As a rule, the clothes with buoyancy, resisting cold and water resistance are popular.Outfit has the uniform of all these characteristics and the army personnel of jacket overcoat has advantage in many cases.For example, in the rugged country of inclement condition, soldier's clothing can improve its maneuverability greatly, and it not only can keep out the cold, and guarantees that the wearer avoids exposing to wind and rain, and crosses the river at any time or drops down water but also can make things convenient for because clothes has the characteristic of buoyancy and waterproof.Climber and hiker can find that also such clothes have similar advantage, no matter pass the river, resist floods, also or resisting cold all have potential advantages.Make the best use of everything for making to greatest extent, this clothes not only have these different performances, but also should be comfortable, and profile is not huge, use not burdensome.The aquatic sports fan can think that also these type of clothes have some certain benefits, and really, for many activities, the clothes with buoyancy, resisting cold and water resistance will be perfectly and have ample scope for one's abilities.
As everyone knows, people have produced the various insulation garments that bubble is smeared material that have, therefore, U.S. Pat Pat.NO.2 976 539 has disclosed a kind of with the lining material that contains the porous of sealing molecule that expanded, and first-selection goes out the heat-insulation and heat-preservation clothes that polyvinyl chloride is made.These clothes are thick and burdensome, do not have enough buoyancy with the body weight of backer in water.Similarly, U.S. Pat Pat.NO.3511 743 has announced a kind of heat-resisting film article as space suit and diving dress, its core is a kind of contain sponge or foam open molecule or the sealing molecule, but impermeable rubber of a kind of liquid or plastics extexine must be arranged.Adopt the increase maneuverability of film energy appropriateness, but still quite burdensome, and do not have enough buoyancy, and can not be used as lifesaving appliance.
Polyethylene is recommended to be used as the heat-insulating material of lifeboat or life vest or to insert thing.U.S. Pat Pat.No 3 067147 suggestions adopt a kind of low density polyethylene (LDPE) foamed material to reach this purpose, adopt 1,2 one dichlorotetra-fluoroethane as blowing agent or aerating agent.With fulminant again being squeezed in the mixture atmosphere after polyethylene and the aerating agent pressurization, form a kind of cellular material of expansion.It is bulky that this product still shows in use, heavy inconvenience.Similarly, U.S. Pat Pat.No.3 819543 announced a kind of after mold pressing and chlorination are handled, the polyethylene that is cross-linked, be used to produce floating thing and interlining.Reference when recommending various known aerating agents and being cross-linked agent for use.Thick and the heavy inconvenience of molded and shaped product.
Although have these advantages, people still need a kind of material thin, light weight as garment lining and production outdoor equipment, and this material should have buoyancy free from worldly cares, resisting cold and fire resistance characteristic concurrently, and don't hinders wearer's mobility.
Is target of the present invention by preparing a kind of low density polyethylene (LDPE) through foaming and expansion with superpower buoyancy and adiabatic heat-insulation characteristic to reduce above-mentioned shortcoming.Another target of the present invention provides a kind of technology that can produce the low density polyethylene (LDPE) through foaming and expanding with superpower buoyancy and adiabatic heat-insulation characteristic.This invention also has a target to provide that a kind of quality is thin, the lining material of light weight, and is not burdensome and have clothes---gym suit, Western-style clothes, military clothes or other relevant devices of superpower buoyancy and adiabatic heat-insulation characteristic concurrently for producing the not huge use of volume.
These and other target all can reach by following technology according to the present invention.This technology comprises low density polyethylene (LDPE) and aerating agent, surfactant and release agent mixing preferably, add hot mixt to form a kind of softening material, the temperature of softening thing that raises makes the aerating agent gasification, make foaming of polyethylene molecule and expansion, reduction shrinks and sclerosis the sub polyethylene subdivision through the poly temperature through foaming and expansion, the aerating agent that adds a kind of gaseous state is in polyethylene material, the polyethylene molecule is foamed once more and expand, again this mixture is cooled to the temperature that is suitable for cutting, cutting then: heat this material to the temperature that is fit to extruding, extruding then, it is shaped to film or tubulose: at room temperature film or tubing were cooled off 24 hours at least at last, thereby form low-density polyethylene film or tubing with superpower buoyancy and insulation capacity.
The present invention also comprises a kind of through going out low-density polyethylene film or the tubing through foaming and expansion that explained hereafter of the present invention is made.The present invention also comprises a kind of clothes, its lining material be a kind of be 0.5-1.0mm through foaming and the thickness that expands, it is waterborne that the clothes of making lining with this material 300g can make the weight of 130kg swim in.
According to the present invention, this technology is more specific to be: nitrogenous two phosphoamides are aerating agent, zinc oxide (ZnO) is surfactant, carbon zinc (ZnC) is a release agent, dichlorodifluoromethan (Freon) is the gaseous inflation agent, so a kind of low-density polyethylene film through foaming and expansion process with buoyancy, waterproof, adiabatic heat-insulation characteristic that is used as garment lining has just formed.
By the description of following details, conjunction with figs. will can better understand the present invention again, the description of its system technological process that should invention.
Fig. 1 realizes the concrete technological process floor map of this invention
The vertical view of position shown in the arrow II among Fig. 2 Fig. 1
Fig. 3 produces the original pressurizing unit of low density polyethylene (LDPE) or the partial cross section cutaway view of water back according to technological process of the present invention
Extruding breathing space, back and cooling zone schematic diagram in Fig. 4 polyethylene process produced according to the invention
According to the present invention, and as shown in the figure, the low density polyethylene (LDPE) by traditional handicraft is mixed with for example, 1 li of loading hopper, at first is stirred in the 1st kind of blowing agent, surfactant and release agent and forms a kind of dried mixture 2 together.This dried mixture 2 is transported to the water back 3 of a sealing, carries out the processing under a series of different temperatures here.A traditional thermal coupling control cabinet 4 is used for controlling desired specified temp of 3 each process segment of water back.
Traditional feeding coil or spiral transmit mixture by the 3A of first of water back.The input that forbay 6 is configured in water back provides compressed air, by water back to assist to transmit mixture.
At the phase I of water back 3A, mixture is heated to a certain temperature, such as about 170 ℃, to form a kind of fusing and softening polyethylene material.At the second stage 3B of water back, the material of fusing is heated to a certain temperature (gasification temperature that depends on blowing agent) effectively with blowing agent gasification and further melting polyethylene material.Blowing agent and air begin to penetrate the molecule of the low density polyethylene (LDPE) agglomerate of fusing, and molecule begins to expand.The gasification of certain blowing agent discharges nitrogen (N2) and carbon monoxide (CO), and both react to each other and produce carbon dioxide (CO2), and CO2 is penetrated in the low-density polyethylene molecule then, causes that these molecules produce foam and expansion, i.e. foaming.
At the 3rd section 3C of water back, expanded polyethylene is processed to a certain temperature, such as about 150 ℃, makes the molecular contraction and the sclerosis of the polyethylene material that has partly expanded.
Low-density polyethylene (LDPE) also is that everybody knows very much aspect processing technology, and it has a specific variable density scope 10-40lbs/ft
3With the density ratio with respect to water---about 0.910-0.925, the density of water is counted as 1 here.The polyethylene that density is higher is inapplicable in this invention.
Originally low-density polyethylene and suitable blowing agent are mixed into powder, blowing agent comprises nitrogenous two phosphoamides (Azodicarbonamide) (the obtainable Celogen of being AZ Kempore on the market, gasification temperature is about 195 ℃), N-N2-nitro-5-methyl tetramine (N, N '-dinitrosopentamethylene-tetramine) (that can get on the market is Unicel NDX, about 195 ℃ of gasification temperature) and 4-4 ' dihydroxy polymer, 4,4 ' Oxybis) (that market can get is Celogen OT, about 150 ℃ of gasification temperature 〉.Add blowing agent quantity approximately be 1% of polyethylene weight.The quantity of blowing agent surpasses 1%, is no use to target of the present invention, because excessive expansion can take place the polyethylene molecule.Equally, the quantity of blowing agent is less than 1%, also can not make the expansion of polyethylene molecule with respect to target effective of the present invention.
Nitrogenous two phosphoamides (Azodicarbonamide) are first-selected blowing agents, especially wear or the aspects such as lining of the article of usefulness in that tailoring, sleeping bag and other are next to the shin.It is tasteless nontoxic, and final products are faded, and can produce the foamed gas of maximum quantity.Comparatively speaking, nitrogenous two phosphoamides (Azodicarbonamide) of every gram solid produce 220cc gas, and 4-4 ' dihydroxy polymer (4.4 ' Oxbis) only produces 130cc/g gas, and N-N ' 2-nitro-5-methyl tetramine is produced 210cc/g gas approximately.
Suitable surfactant is at first mixed the formation powder with low-density polyethylene, comprise zinc oxide (ZnO), calcium oxide (CaO) and calcium carbonate (CaCO
3).It approximately is the 0.10%-0.23% of polyethylene weight that the surfactant total amount is added up.
Surfactant has several important function.At first, it has activated foaming process, prevents the expansion of overrunning in foaming process of LDPE molecule simultaneously.Secondly, in foaming process just the temperature in the water back 3 reduce gradually.For example, with nitrogenous two phosphinylidynes (Azodicarbonamide) as the place of blowing agent, surfactant help third part 3C at water back 3 with temperature maintenance about 150 ℃.Lack this activator, the gasification blowing agent will cause the excessive inflation that the present invention does not reckon with temperature increase to about 196 ℃.
In initial blend step, can but and nonessential adding release agent.Originally the better suited release agent that mixes with low density polyethylene (LDPE) is exactly carbon zinc (ZnC).Release agent preferably adds with powder, helps to prevent that LDPE is bonded on the internal face of coil 5 or water back 3.The quantity of the release agent that adds approximately is 0.3% of polyethylene weight.
At the 4th stage 3D of water back, a kind of gas foaming agent 7 is added into the molecule expansion that makes it to enter second stage in the polyethylene material, and the foaming molecule of strengthening this material.This a kind of blowing agent is at about 35kg/cm
2Pressure under add.
Although perhaps liquefied petroleum gas (LPG) or dichlorodifluoromethan (Freon) they are available with the mixture of liquefied petroleum gas, and this gas foaming agent---dichlorodifluoromethan (Freon 〉, because of the well-known trade mark of dichlorofluoromethane, the better blowing agent of can yet be regarded as.Other suitable gas foaming agent has 1-chloro-2-fluoromethane and 2-chloro-2-fluoroethane.The advantage of LPG is that price is not high, although it has potential poisonous influence.Therefore, be the lining of tailoring, sleeping bag etc.And in the preparation expanded polystyrene process, used blowing agent should preferentially select not have potential toxic and side effect.
After having added the reexpanding of gas foaming agent and polyethylene material, this material will be sent to the 5th stage 3E of water back, is about 100 ℃ in this phase temperature, and material begins to cool down.100 ℃ be treated to this material correct and effectively cutting get ready.This has just finished heating and foaming process.
First's to the five parts of water back 3 promptly will be spent 30 minutes to 1 hour and just can finish from 3A to 3E.Each part is approximately with the identical time.
The material that expands continues second stage 8 that water back is crossed on the motion limit, no longer includes feeding coil or spiral here in the water back.
In the second stage 8 of water back, the dilatant of right quantity is cut, and for example with 9 cuttings of a traditional cutting blade, dilatant still is in soft state.Certainly, this right quantity depends on the size of final needed film or tubing.
And then the material of the expansion that is cut is controlled in about 105 ℃ in water back 8A place temperature, is expressed under normal pressure and room temperature in a free wxpansion district 10 and the cooling zone 11 by a mould and axle 20 again.Because about 100 ℃ temperature is pushed and Yan Taileng appropriateness, therefore the temperature of cutting back material must have slight rising.After the extruding, the polyethylene material of foaming under normal pressure the nature expansion but be not fulminant expansion, at room temperature the short time (such as several seconds kinds〉cooling.Then, cooled polyethylene material forms thin-film material 12 or forms tube (not signal among the figure) by traditional approach by traditional approach 13.Corresponding thickness or diameter depend on the final desired use of product respectively.
Final products are low-density polyethylene, comprising the countless network structures that sealing is wrapped in that are full of the little molecules formation of air.The weight of final products is consistent with the weight of initial low density polyethylene (LDPE).Like this, for example the low density polyethylene (LDPE) of 25kg has just been produced the final film product of 25kg.
The invention provides one through foaming and the low-density polyethylene film of expansion or the molecular structure skeleton symbol of tubing :-(CH
2-CH
2Its weight of)-, is at 12-21g/yd
2In the scope, thickness is approximately 0.5-1.0mm.This film is a feature with buoyancy free from worldly cares and heat-insulating property.For example, the finished product polyethylene film of 300g can floating the weight greater than 130kg.The polyethylene film manufactured goods compare between 0.40-0.55 with respect to the density of water, and the density of water is identified as 1 here.In addition, this low-density polyethylene film or tubing through expanding and foaming also has resisting cold, waterproof and moistureproof function.
The prepared low density polyethylene (LDPE) through expansion and foaming of the present invention can form the film of any thickness, but optimum thickness is between the 0.5-5.0mm, and for clothes, the thickness of this film should be not less than 0.5mm and be no more than 1.0mm.The film that thickness is lower than 0.5mm does not have enough buoyancy and impracticable in the present invention.On the contrary, the film that thickness surpasses 1mm is not suitable for clothes processing of the present invention yet, because the clothes made from them are uncomfortable.In the place of low-density polyethylene film as the lining of tent, sleeping bag, blanket and similar articles, thickness reaches 5mm may have advantage and can not make it seem too fat to move and burdensome according to the present invention.In the operation of mixing, can add an amount of traditional additive to give final products extra performance, for example add the antiblaze of waterproof, as tin.These traditional additives have increased the weight of finished product, but can obviously not influence the flotation property or the heat-insulating property of final products.Typical additive comprises the interconnection agent of the 0.1%-0.2% that accounts for polyethylene weight, such as nitrogenous moulding acid amides (ABFA) or peroxide, this can add to improve the tear resistance of finished product by powder, also need add 0.1% ultraviolet absorber, can prevent to fade.After the polyethylene of foaming and expansion forms film or when film forms, can be clipped in polyethylene between the thin layer of certain material such as nylon, vinyl plastics, plastics, for this moment polyethylene still be in the soft state of certain formula degree, so sandwich material just sticks on the polyethylene slightly. the more important thing is, interlayer this moment easily makes polyethylene affix one deck cladding material, and the cutting of finished product and transportation are more saved trouble.In addition, such material covers the life-span that has prolonged film.
The storage of low-density foamed polyethylene produced according to the invention does not need specific condition, even in the waterproof of considering product and humidity resistance, last 24 hours cooling stage does not need yet.
And, in this process, there is not the polyethylene waste material to produce.For example, 10g low density polyethylene (LDPE) raw material can be produced 10g through expanding and the low density polyethylene (LDPE) that foams according to the present invention.
The diameter of the polyvinyl piping materials of producing according to the present invention is decided with final use.The tubing that squeezes out can be solid also can be hollow, have special purposes aspect the floating material providing around the boats and ships.
Example has hereinafter been described the utilization of basic principle of the present invention.Yet this can not also should not be construed as the reason of the restriction scope of the invention.
Embodiment
The low density polyethylene (LDPE) of 25kg is at a feed hopper. and mix mutually with nitrogenous two phosphinylidynes of 250g, 40g zinc oxide (ZnO) and 75g carbon zinc (ZnC) lining.Send mixture to a water back that is built-in with auger conveyor, this auger conveyor is supplied with mixture by this pipeline just.The air assisted of supplying with from a forbay transmits mixture.In the first of pipeline mixture is heated to 170 ℃ and melt.The material of fusing flows through the second portion of pipeline, keeps 200 ℃ temperature, and nitrogenous here two phosphinylidynes gasification enters the polyethylene molecule and makes its expansion.Be controlled to 150 ℃ in the temperature of these materials of third part then it is cooled down, make these molecule hardening and slight shrinkage thus.Then press 35kg/cm
2Inlet amount add dichlorodifluoromethan and expand and foaming further to make these materials.Next step temperature with these materials is reduced to 100 ℃ makes it meet the cutting condition.With cutter cutting lumps material, up to the lumps thing that sends by pipeline has all been cut, the temperature with this material is elevated to 105 ℃ again, for following one extrusion process got ready.This material is expressed in the expanding chamber at ambient temperature.Material begins to expand, but can not expand (outburst) rapidly.After the material after the extruding cools off several seconds, just it is shaped to the thick film of 1mm by a roll shaft.Continuous films is processed to 4 reel shapes, stores 24 hours down at 25 ℃ then. and final products are the polyethylene film of 1mm for the thickness through expansion and foaming, the long 300m Unit Weight 218g/yd of 1 volume
2, heat-transmitting is than being 6.70W/ (m
2℃), the coefficient of overall heat transmission is 52.5% (ASTMD1518), water absorption rate is 9.1 * 10
-4Lbs/ft
3(BS3595-1969), 300g polyethylene finished films can make the body weight greater than 130kg swim in waterborne.
Low density polyethylene (LDPE) through foaming and expansion of the present invention has many purposes, as clothes, sleeping bag, blanket, mat gym suit lining, and other Relexing devices such as tent, traveling bag, knapsack, lifeboat, on-deck seat and other relative articles.Because low density polyethylene (LDPE) product of the present invention has superpower floating ability and insulation capacity concurrently, just there is no need to be equipped with the water safety instrument again.A simple clothes of being made by the lining material that the present invention produced both can be used as the warming overcoat of windproof resisting cold, can be used as again to deal with general floating and emergent flotation gear.In addition, be above-mentioned purpose, the present invention also provides a kind of light weight, sleazy clothes, and is comfortable and easy to wear and not burdensome, therefore both can increase enjoyment, very safe again.
This invention provides a kind of lining material and clothes, even clothes is torn or torn, its buoyancy and floating ability still remain unchanged.And blanket and sleeping bag also have floatation characteristic, can be used as auxiliary flotation gear.For example, the safety vest of the burden that the people wore of water skiing substitutes with regard to the safety vest of available a kind of thin light weight, therefore, can improve security and flexible property in the amusement.
Traditional go hunting, fish, camp and army's human clothes and relevant device all can be improved greatly by the present invention, produce a kind of clothes, warming when can be used for dress and going to the countryside, deal with various as fall into water suddenly or situation such as wade across a river.Application the present invention can strengthen the ability of soldier in war polyethylene product of the present invention in production army uniform, overcoat, roomy waterproof garment and also can be used as heat-insulating material, as military radio device or the like.
If the present invention with reference to concrete and more suitably details describe, will be easier to understand.But owing to limited by certain, fail to describe in detail, relevant various modifications to common process within the spirit and scope of the present invention include in claim scope of the present invention.
Claims (14)
1. one kind has the pliable and tough low-density polyethylene film of superpower buoyancy, resisting cold and water proofing property or the production method of tubing, and its special sheet is: it comprises:
(1) with low density polyethylene (LDPE) with account for nitrogenous two phosphoamides of its quality 1% as blowing agent (aerating agent), the zinc oxide of 0.1%-0.2% (ZnO) mixes in conical vessel (loading hopper) as release agent as the carbonization diction (ZnC) of surfactant and 0.3%, forms the dried particulate mixture;
(2) pressed gas that provides of forbay is transported to mixture in the heating tube via an auger conveyor that is installed in the water back first from funnel container;
I) mixture is heated to 170 ℃, forms a kind of softening material;
Ii) will soften the temperature of thing and bring up to 200 ℃,, make low density polyethylene (LDPE) foaming and expansion, so that in softening thing, form the inflation molecule the blowing agent gasification;
The temperature that iii) reduces the polyethylene material after foaming and expansion shrinks and sclerosis the inflation molecular moiety to about 150 ℃;
Iv) the dichlorofluoromethane with gaseous state joins in the polyethylene material as blowing agent, makes polyethylene further foaming and expansion, to increase the intensity of inflation molecule in the polyethylene;
V) mixture is cooled to about 100 ℃, for cutting is got ready;
(3) in the said heating tube of second portion, polyethylene is cut into the block of predetermined quantity.
(4) block that will cut by the no auger conveyor in said heating tube 1 second portion is carried to extruded tube, and then block is heated to 105 ℃, for next step extruding is got ready;
(5) under room temperature and atmospheric pressure (normal pressure), will extrude in the mould of material from no helix transporting device through heating again, enter into a free wxpansion district, the inflation molecule expands naturally at this, but can explosively not expand under room temperature and normal pressure;
(6) extrudate is shaped to thin-film material or tubular material;
(7) at room temperature thin-film material or tubing were cooled off 24 hours at least, have the compressible low-density polyethylene film or the tubing of superpower buoyancy and insulation capacity with formation.
2. according to the production method of the described low-density foamed polyethylene of claim 1, it is characterized in that: the additional density of low density polyethylene (LDPE) is about 10-40lbs/ft
3
3. according to the production method of the described low-density foamed polyethylene of claim 1, it is characterized in that: surfactant is from comprising zinc oxide (ZnO), calcium oxide (CaO) and calcium carbonate (CaCO
3) one group in choose.
4. according to the production method of the described low-density foamed polyethylene of claim 1, it is characterized in that: with dichlorofluoromethane with 35kg/cm
2Pressure join in the polyethylene mixture.
5. according to the production method of the described low-density foamed polyethylene of claim 1, it is characterized in that: the thin-film material of extrudate after moulding is 0.5-1.0mm through cooled thickness range.
6. according to the production method of the described low-density foamed polyethylene of claim 5, it is characterized in that: after cooling, its thickness is 5mm to extrudate through the thin-film material after the moulding.
7. according to the production method of the described low-density foamed polyethylene of claim 5, it is characterized in that: also be included in and accompany described thin-film material between the two relative layer materials so that later processing and the processing of the thin-film material of this moulding.
8. according to the production method of the described low-density foamed polyethylene of claim 1, it is characterized in that: film or tubing at room temperature cool off, and room temperature means 20-30 ℃, begin to make the inflation molecular contraction, allow molecule to return to swelling state then.
9. according to the production method of the described low-density foamed polyethylene of claim 1, it is characterized in that: said mixture transmits through auger conveyor, and the whole time needs 30 minutes to 1 hour approximately.
10. the low-density goods with good buoyancy, heat preservation and insulation and water resistance is characterized in that, it comprise a kind of pliable and tough, expandable, contain the polyethylene film that seals molecule, density is 0.0251-0.0285g/cm
3, being about this poly buoyancy of 300g, it is waterborne that the weight of 130kg is swum in, and to the thick polyethylene of 1mm, its 1 water absorption rate is about 0.041g/cm
3, the heat-transmitting ratio is about 6.7OW/ (m
2℃), the poly coefficient of overall heat transmission that 1mm is thick is 52.5%, needs to cover at least with a kind of covering a side of polyethylene film during storage.
11. a kind of low-density goods alleged according to claim 10, its cladding material are to choose from comprise nylon, vinylite, plastics, organdie, as thin as a wafer a group of cloth fabric etc.
12. a kind of low-density goods according to claim 10, cladding material stick to the side that the outer surface of this polyethylene film does not apply the protection thing at least.
13. the low-density goods with good buoyancy, adiabatic heat-insulation and water resistance is characterized in that: comprise a kind of pliable and tough, expandable, contain the polyethylene film that seals molecule, its density range is about 0.0251-0.0285g/cm
3, its buoyancy of this polyethylene film of 300g, floatability plays the weight of 130kg, and its water absorption rate of polyethylene that 1mm is thick is about 0.004lg/cm
3, at this, this polyethylene film be attached in the following article as lining material: tent, sleeping bag, blanket, mat, knapsack, lifeboat, deck-chair and clothes etc.
14. the low-density goods with good buoyancy, adiabatic heat-insulation and water resistance, comprise a kind of pliable and tough, expandable, contain the polyethylene film that seals molecule, its density range is about 0.0251-0.0285g/cm
3, the buoyancy of this polyethylene film of 300g, it is waterborne to be enough to make the weight of 130kg to swim in, and its water absorption rate of this polyethylene that 1mm is thick is about 0.004lg/cm
3, the heat-transmitting ratio is about 6.7OW/ (m
2℃), the coefficient of overall heat transmission of this thick polyethylene film of 1mm is about 52.5%, in this invention, this polyethylene film as lining material attached to clothes or put outward.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011234830A CN1161223C (en) | 2001-07-26 | 2001-07-26 | Production process of low-density foamed polyethylene |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011234830A CN1161223C (en) | 2001-07-26 | 2001-07-26 | Production process of low-density foamed polyethylene |
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| CN1398718A true CN1398718A (en) | 2003-02-26 |
| CN1161223C CN1161223C (en) | 2004-08-11 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101046273B (en) * | 2006-03-28 | 2010-11-10 | 布鲁格罗尔控股公司 | Method for processing foaming or inflated casing used for flexible heat-insulation catheter |
| CN103302875A (en) * | 2013-05-31 | 2013-09-18 | 西昌丰泰包装有限公司 | Production process for preparing waterproof heat-insulation composite board |
| CN106146892A (en) * | 2016-06-30 | 2016-11-23 | 安徽省含山县锦华氧化锌厂 | A kind of rubber defoamer formula and preparation method thereof |
| CN110757710A (en) * | 2019-09-27 | 2020-02-07 | 林光湧 | Fresh-keeping packaging kit and preparation method thereof |
| CN114599501A (en) * | 2019-10-18 | 2022-06-07 | 麦西皮烫衣部股份公司 | Method and apparatus for applying a film to a three-dimensional article |
-
2001
- 2001-07-26 CN CNB011234830A patent/CN1161223C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101046273B (en) * | 2006-03-28 | 2010-11-10 | 布鲁格罗尔控股公司 | Method for processing foaming or inflated casing used for flexible heat-insulation catheter |
| CN103302875A (en) * | 2013-05-31 | 2013-09-18 | 西昌丰泰包装有限公司 | Production process for preparing waterproof heat-insulation composite board |
| CN103302875B (en) * | 2013-05-31 | 2016-03-02 | 西昌丰泰包装有限公司 | A kind of production technology preparing waterproof heat-insulation composite board |
| CN106146892A (en) * | 2016-06-30 | 2016-11-23 | 安徽省含山县锦华氧化锌厂 | A kind of rubber defoamer formula and preparation method thereof |
| CN110757710A (en) * | 2019-09-27 | 2020-02-07 | 林光湧 | Fresh-keeping packaging kit and preparation method thereof |
| CN114599501A (en) * | 2019-10-18 | 2022-06-07 | 麦西皮烫衣部股份公司 | Method and apparatus for applying a film to a three-dimensional article |
| CN114599501B (en) * | 2019-10-18 | 2024-05-17 | 麦西皮烫衣部股份公司 | Method and apparatus for applying a film to a three-dimensional article |
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| Publication number | Publication date |
|---|---|
| CN1161223C (en) | 2004-08-11 |
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