CN86105767A - The manufacture method of polyolefin foam - Google Patents
The manufacture method of polyolefin foam Download PDFInfo
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- CN86105767A CN86105767A CN86105767.8A CN86105767A CN86105767A CN 86105767 A CN86105767 A CN 86105767A CN 86105767 A CN86105767 A CN 86105767A CN 86105767 A CN86105767 A CN 86105767A
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Abstract
With the synthetic evenly micropore polyolefin foam materials of sealing of three-step approach.This method capacity usage ratio and production efficiency height.The first step is to depress containing the expandable polyolefin type resin combination heating certain hour of linking agent and whipping agent adding, and transfers pressure in the situation that this whipping agent partly decomposes, obtain elementary in the middle of foam product; Second step was that this elementary intermediate product heats under barometric point, it is foamed again, and it was still undecomposed to keep a part of whipping agent; The 3rd step was that the foams in second step are put into metal die, through pressurized, heated, the whipping agent of wherein retaining was all decomposed, and without cooling, directly die sinking obtains good foam materials.
Description
The invention relates to the manufacture method of polyolefin foam.Or rather, have homogeneous, method sealing, the thick polyolefin foam of microbubble body about manufacturing; This expanded polyolefin demonstrates the physical properties of the homogeneous with low-cost high energy efficiency.
Since this expanded polyolefin excellent physical characteristics, and have purposes widely.For example, snubber, heat insulator, audio insulator, protecting sheet, packing filler, the filler of mat and various types of packing material.
To so far, the pressure foaming generally adopts as making expanded polyolefin.Common this pressure foaming generally is divided into a step pressure application and two step pressure applications.Carry one in passing, use so-called single stage method, list is difficult for reaching high rate of expansion by foaming itself, also is difficult for obtaining ganoid product.For making foamed products have the effort that smooth surface is done, but cause reducing the unfavorable result of product thickness, and the output of the froth product that calculates according to starting material has reduced also.Therefore, adopt two step method to make the expanded polyolefin of high rate of expansion usually.
For example, at the open SHO45(1970 of Japanese Patent) in-29,381 the specification sheets and United States Patent (USP) No.3, in 098,832 the specification sheets two step method has been described.This method is that the polyolefin blend that will contain linking agent and whipping agent is filled in the general metal die that can tightly seal, under the decomposition temperature of pressurization and linking agent, make crosslinking reaction takes place in the mixture, keep whipping agent not decompose simultaneously or make the gas dissolving of decomposition and be retained in the resin; Make the compound cooling and the curing that obtain, under atmospheric pressure simultaneously, heat the foamable laminar product that obtains once more, make it to foam and expand.Compare with an above-mentioned step pressure application, the feasible foaming of this two-step approach physical efficiency is to the three-dimensional expansion and can not make surface distress, thereby can produce the foam product that has good mini-foam under high rate of expansion.If under barometric point, but laminar foam is not when being placed in the metal die foamable, always obtains in uneven thickness, surface irregularity and irregular product.The epidermis on coarse foamed product surface if prune, obtaining ganoid hexahedron foam block, incident unfavorable result is, for used starting material, the yielding poorly of product, production cost is just high.
The present inventor has invented and has relevantly prepared the method for foam materials and applied for patent.This method comprises uses aforementioned second step heating under barometric point, and section shape and the corresponding metal die of size with section shape and size and final froth product, the metal sheet of heating of metal mould externally, thereby heat the primary middle foam product in this mould indirectly, remaining whipping agent is decomposed fast, make have low density, the polyolefin foam of all even physicals homogeneous of thickness (Japanese Unexamined Patent Publication No SHO57(1982)-191,029).
When using above-mentioned metal die, after finishing for second step, this mould and built-in foams have been heated to about 150 ℃, and the loading and unloading metal die was very difficult when this took out foams from mould.In order to overcome this difficulty and to guarantee to obtain ganoid foam materials, be necessary behind second EOS, earlier with the metal die cooling, and then take out foam materials.Therefore, this operation makes capacity usage ratio low, and heating and cooling are handled because metal die will hocket, and incident is that production efficiency is low.In addition, the pipeline of circulation heating medium also is easy to breakage and needs place under repair in the metal die.
A target of the present invention is to overcome above-mentioned difficulty, and a kind of lower-cost working method is provided, and has the uniform micro of good sealing with manufacturing, and has the thick foam materials of the physicals of homogeneous thickness and homogeneous; And this method has high energy efficiency and high yield.
A kind of polyolefin foam and method that can achieve the above object made provided by the invention is characterized in that branchs three goes on foot to foam.The first step is: to containing the foamable polyolefin resin type composition of linking agent and chemical foaming agent, under the condition of pressurization, heat the regular hour, transfer pressure in the situation that aforesaid whipping agent has part to decompose, make a kind of primary middle foam product thus; Second step was: the above-mentioned intermediate product of heating under barometric point, thereby make it foaming to a certain degree, until wherein surplus the still undecomposed state of partial foaming agent is arranged till; The 3rd step was to result product further heating in metal die in second step, remaining whipping agent to be decomposed, and obtain final foam materials without the direct die sinking of cooling under pressurized conditions.In this case, viewpoint from thermo-efficiency and operation efficiency, hope can be used a kind of metal die that can not deadend when under atmospheric pressure heating aforesaid, and can be between next step heating period depresses the mould that continues to use this not improved form adding.
Find out clearly that from the foregoing description method of the present invention is resembling after adding of common implementation depress through heating, make the first step that the partial foaming agent decomposes, comprise that also following two steps are as the unprecedented component part of this method:
(A) the elementary middle foams that the first step is obtained carry out heating operation under barometric point, so that these primary foams foam, up to the partial foaming agent, preferably the whipping agent of 1-60% still is in undecomposed state and gets final product (second step); And
(B) second foams that obtain of step are further heated adding to depress, remaining whipping agent is decomposed; Foams are directly opened metal die without cooling, make froth product (the 3rd step) simultaneously.
The operating process of above-mentioned several steps and the mutual relationship between them will be narrated below.At first, method of the present invention is different from usual method, and it can obtain froth product (as described in (B)) without the direct die sinking of cooling after handling crosslinked and foaming fully.As general processing, after crosslinked and foaming were handled, foam need remain with enough residue bulging forces, makes it automatically to expand, and after metal die is opened, can spin off from mould.This requirement is resolved in above-mentioned (A) integral part.Say precisely, when under barometric point, heating, must keep 1-60% is arranged in the resin whipping agent at undecomposed state.In the time can accomplishing that this requires, these undecomposed whipping agents add to depress in the heat-processed and decompose what carry out subsequently, have produced the said residue bulging force in front.In order to reach this purpose, under barometric point, to remain with 1% whipping agent in the heat-processed at least and be in undecomposed state.If the whipping agent ratio that is under the undecomposed state surpasses 60%, make that the expansion of foams is excessive after the die sinking tool, cause foams will be easy to suffer fragmentation or fracture.
In front described in (B) under pressure the heating after, obtain a kind of polyolefin foam with homogeneous physicals and uniform thickness.As what described, for common processing technology, when foaming under barometric point, because heat conducting ununiformity, the physicals of products obtained therefrom and thickness all lack homogeneity.When the internal surface close proximity of foams that contain the undecomposed whipping agent of part and metal die touches down when being heated, whipping agent decomposes and bubbles, caused a kind of pressurized state, foam is under the state of pressurized and all be subjected to the heating of metal die plate on the entire circumference surface in the middle of making.Therefore, it is satisfactory to conduct heat, and uniformity of temperature profile so just can make the physicals (as density, compressive hardness) with homogeneous and the foam materials of uniform thickness.
Previously described like that in heating under the compressed state and after metal die cooling again during the demoulding when the foam body image, the cooling effect of this mould is cooled off foams and is solidified under the situation that does not change its shape.When according to method of the present invention, during die sinking, it is similar to the shape and size of metal die inner chamber that the foams that obtain will be expanded to its shape and size before metal die is still uncolled.Therefore, obtain high rate of expansion, low-density polyolefin foam.
From the easy demoulding this point of foams, the sidewall of then wishing metal die should be taper, can make the opening end of metal die wideer than its bottom like this.The structure of this mould can make after opening mould, and foams will expand, and floats along the sidewall of upwards widening automatically.
Content of the present invention is once summarily described.At first, with polyolefin-type resin and whipping agent, linking agent, and additional blowing promotor, pigment etc. mix.According to used resin kind, preferably be selected under the 70-130 ℃ of high temperature within the scope, make these components go out in the mixing machineries such as machine or kneading machine mixing in mixing roll, the agent of kneading.Though the consumption of whipping agent and linking agent is the rate of expansion that will reach according to foam product and rationally determining; But, be 100 parts of calculating with used weight resin, suitable foaming agent consumption approximately is 2-40 part weight, the consumption of linking agent approximately is 0.05-5 part weight.
Secondly, crosslinkable and the foamable composition that obtains is above packed in the metal die, and the pressurization deadend is heated to 120-180 ℃ (being preferably 140-170 ℃) then, keep 10-50 minute (being preferably 15-35 minute), thereby make partial foaming agent and partial cross-linked dose of decomposition.So, when component maintains higher temperature, and put pressure when preferably also having the whipping agent of 40-90% still undecomposed.Then, the elementary middle foams that obtain are taken out from metal die.Usually, in case after the kind of used resin kind, linking agent and whipping agent and blowing promotor and consumption determine, the quantity of residual undecomposed foam just be decided by Heating temperature and heat-up time.Therefore, in actually operating, these related datas have just been measured in advance, so Heating temperature and heat-up time just can be selected, so that retain the undecomposed whipping agent of predetermined amount.This method can be used under atmospheric pressure heating, and the back will be described in detail this.
Moreover, according to the front foams in the middle of make elementary are described, pack into a kind of can not the metal die of deadend in, this kind mould preferably has the sidewall that dwindles downwards, for example sidewall is the metal die of the casket shape of taper.Than the bottom surface bigger area is arranged at mould upper opening place like this.Two made thermal mediums that pipeline is arranged are equipped with on the top of mould and base, such as steam or the hot-plate that passes through of heating wet goods, or two hot-plates that are equipped with well heater are housed.By the hot-plate medium on the heating mould, primary foams are heated to 140-200 ℃ (preferably 150-180 ℃) keep 10-50 minute (preferably 15-30 minute) under barometric point, the whipping agent that also leaves 1-60% in resin is till the undecomposed state.In other words, heating proceeds to also to remain has the whipping agent of 1-60% undecomposed, and primary foams have filled up the metal die cavity because of expansion.
At last, by the foams that obtain previously, stay usually and further be heated to aforementioned temperature in the aforesaid metal die under compressed state, promptly 140-200 ℃ (being preferably in 150-180 ℃) is till remaining whipping agent decomposes completely.When mould was opened under not cooling off in advance subsequently, foam materials expanded, and takes off from metal die automatically.
Can know clearly very that from top description method provided by the invention has following effect and advantage:
(a) except the finished product naturally cooling, in whole procedure, do not relate to cooling step, so the efficiency height.
(b) because in above-mentioned second kind of metal die, have passage, only by heating medium, thereby can heavy wear, but also because between heating medium and heat-eliminating medium, do not need translating eqipment, so equipment cost is low.Add the efficiency height of saying previously, just reduced the whole production cost.
(c) operation efficiency height.This is that foam product has the residue bulging force, and the sidewall of second kind of metal die is taper because under compressed state after the heating, and this is enough to make foam product to be deviate from from this kind mould automatically.
(d) in last heating steps, heat transfer to foams is gratifying, along the temperature distribution of foam thickness direction also is uniformly, and this is because when using second kind of metal die, foams with metal heater plate closely contact with compressed state under heat.Therefore, be easy to make the thick foam materials that has the homogeneous physicals and have the mini-foam that well seals uniformly.In addition, because the whipping agent of foam surface thoroughly decomposes, the foam materials surface becomes bright and clean (when being added with pigment in the preparation foamy component, foam surface shows the color of pigment) as a result.Thereby the epidermis of the foams that reamed once can be as the part of foam materials and be used.
" polyolefine " speech that the present invention is used, comprise and pass through high-pressure process, various other polyethylene of level that middle-pressure process, low-pressure process are produced, poly--1, the 2-divinyl, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-vinyl acetate copolymer, ethene and content are up to 45%(weight) acrylic or methacrylic acid methyl esters, ethyl ester, propyl ester, the multipolymer of butyl ester; Their chlorinated derivative (chloride weight is up to 60%), two kinds or more of above-mentioned mixture of polymers, and the polyacrylic mixture of above-mentioned polymkeric substance and together complete or isostructure.
Used " linking agent " speech among the present invention is meant certain as the organo-peroxide that produces free radical, and in the polyolefine of this superoxide superimposed narration, it is high to require its decomposition temperature to begin to melt the mobile temperature than polyolefine at least.Under heating condition, organo-peroxide produces free radical, produces bonding in the molecular polyolefin chain or between the molecular chain.That the organo-peroxide example comprises is following (but be not be limited in this several in): dicumyl peroxide, 1.1-two (tert-butyl hydroperoxide)-3,3, the 5-trimethyl-cyclohexane, 2,5-dimethyl-2,5-two (tert-butyl hydroperoxide) hexane, 2,5-dimethyl-2,5-two (tert-butyl hydroperoxide) hexin, α, α-two (tert-butyl hydroperoxide) diisopropyl benzene, tert-butyl hydroperoxide ketone and the phenylformic acid peroxidation tert-butyl ester.For a certain used polyolefine, be necessary to select the most suitable its special organo-peroxide.
Can be used for whipping agent of the present invention is a class chemical foaming agent, and its decomposition temperature will be higher than the fusing point of said polyolefins.The whipping agent example that can meet this requirement comprises following (but not being to be limited within this scope): azo compound, as azodicarboamide and barium azo-biscarbonate; Nitroso compound, for example dinitrosopentamethylene tetramine and trinitroso-trimethylene triamine; Hydrazide kind compound, as P, P '-oxidation-two (benzol sulfohydrazide); And the sulfonamido carbamide compounds, P for example, P '-oxidation-two (phenylsulfonamido urea) and tolylsulfonyl Urea,amino-or the like.
In the method for the present invention, also allow type, add frothing aid in addition according to used whipping agent.The example of frothing aid has (but being not restricted within this scope): be the mixture of main component with the urea; Metal oxide, as zinc oxide, plumbous oxide; Containing with Whitfield's ointment, stearic acid etc. is the mixture of major ingredient, the metallic compound class of promptly higher lipid acid or higher lipid acid.
In order to reach the physical property of improving composition therefor and the purpose that reduces product cost, the present invention allows to add in addition additive (filler), and these additives can not produce any injurious effects for the crosslinking reaction of composition.The example of additive has (but not being to be limited in this scope): metal oxide-type, and as zinc oxide, titanium dioxide, calcium oxide, magnesium oxide, silicon oxide etc.; Carbonate, as magnesiumcarbonate, lime carbonate; Fibrous material is as paper pulp; Dyestuff; Pigment; Fluorescent substance; And add additive in the rubber usually.
With example the present invention is carried out concrete description below.But the example of being quoted in fact, is not that the present invention is carried out any restriction.
Example 1.
Prescription:
Polyethylene (trade mark is " Yukalon YF-30 ") 100 parts (weight)
14 parts of azodicarboamides (weight)
0.3 part of zinc white (weight)
0.3 part of Zinic stearas (weight)
0.6 part of dicumyl peroxide (weight)
Above-mentioned each component is disperseed equably and mix.Mixture packed in first kind of metal die, and (the base area is 225 * 155 millimeters
2, high 16 millimeters), mould side wall is broadening gradually up, and the compression molding molding machine is arranged above.Externally pressure is no less than 10 kilograms per centimeter
2,, and be heated to 155 ℃ and kept 17 minutes the mould deadend.When foams still maintain comparatively high temps, remove the pressure that is added in the mould, simultaneously elementary foams are taken out from metal die.This elementary foam volumetric expansion to base area is 430 * 295 millimeters
2, 35 millimeters of thickness (rate of expansion is approximately 8).Wherein nearly 75% whipping agent is undecomposed.
Elementary foams after the depanning are put into second kind of metal die of casket shape immediately under comparatively high temps, the sidewall of this mould widens gradually from lower to upper that (the limit area of upper opening is 680 * 520 millimeters
2, the bottom sides area is 600 * 440 millimeters
2, highly be 45 millimeters).On metal die and the base is topped that two hot-plates are arranged, the passage for steam flow is arranged, on every block of plate 175 ℃ of heating 15 minutes down.Foams expand as a result, thereby have filled up the internal space (after this step, it is also undecomposed that approximately residue has 34% whipping agent) of aforesaid second kind of metal die.The foams that obtain thus continue heating 5 minutes under said temperature.Then, open this mould, obtain a kind of foam materials of the microbubble body that has uniformly, well seals of white.
After foam materials just takes out from metal die, measure the size of foams immediately, wherein the size corresponding to the top opening portion of second kind of metal die is 780 * 600 millimeters
2, be 690 * 500 millimeters corresponding to the size of the foams of this mold bottom
2, thickness is 52 millimeters.In fact, in foams, do not find any residual whipping agent.The apparent density that the product that obtains after naturally cooling has is 0.03 gram per centimeter
3, rate of expansion is 30.
The remaining quantity of rate of expansion and above-mentioned whipping agent is (calculating in the following example is also herewith) that calculates by following method:
Rate of expansion: the ratio with the size (thickness * floorage) of the size of foams and first kind of mould is represented.
The residual quantity of whipping agent: with the whipping agent residual quantity in the final product is 0 to represent.
For example, the rate of expansion of the foams after just having taken out from second kind of mould is (690 * 500 * 52)/(225 * 155 * 16)=32; The residual quantity of whipping agent is 0%.Be (430 * 295 * 35)/(225 * 155 * 16)=8 for primary middle its rate of expansion of foams that makes; Remaining foaming dosage is (32-8)/32 * 100=75%.For the foams after under atmospheric pressure foaming through second step, its rate of expansion is (600 * 440 * 45)/(225 * 155 * 16)=21, and its residual foaming dosage is (32-21)/32 * 100=34%.
Example 2.
Prescription:
Polyethylene (trade mark is " Yuklon YF-30 ") 100 parts (weight)
14 parts of azodicarboamides (weight)
0.6 part of zinc white (weight)
0.6 part of dicumyl peroxide (weight)
Each component in the above-mentioned prescription is disperseed equably and mix.Depress through heating gained mixture to produce elementary foams adding according to the program in the example 1 then.Reaction conditions is changed as follows: 245 * 180 millimeters of the base areas of first kind of mould
2, 32 millimeters of height heated 35 minutes down at 155 ℃.These elementary foams are corresponding to be partially expanded to 440 * 320 millimeters on mould base
2Size highly is 70 millimeters (rate of expansion is about 7).Nearly 82% whipping agent is remaining undecomposed in the foams.
Then according to the method for example 1, elementary foams at heating under the barometric point (at this EOS time, also remaining about 55% whipping agent is undecomposed), are continued foamable subsequently again under contractive condition.Different with example 1 is, above-mentioned elementary foams are to be placed in second kind of metal die of two casket shapes, these two moulds are buckled together foamable mouth to mouth mutually then, and second kind of mould of use is measure-alike in the size of second kind of metal die of these two casket shapes and the example 1.
The result that the foams that just take out from mould are measured is: part (corresponding to the opening portion of second kind of metal die) is of a size of 885 * 680 millimeters therebetween
2; Side and lower portion (corresponding to the bottom of second kind of mould) are of a size of 800 * 580 millimeters thereon
2; Thickness is 115 millimeters.In fact be provided with residual undecomposed whipping agent in the foam materials.The product that obtains is a kind of white, has foam materials uniform, the good microbubble body that seals that its apparent density is 0.03 gram per centimeter
3, rate of expansion is about 30.
Example 3.
Program according to example 1 prepares primary foams strictly according to the facts.
With primary foams pack into the used second kind of same metal die of example 1 in, heated 15 minutes down at 175 ℃ with same heating means.After heating ends, will expand and fill up second step of this mould inside spatial foams and from mould, take out.At this moment, undecomposed residual foaming dosage is about 34%.
The foams in second step are put in the 3rd metal die, and its size is identical with foregoing second kind of metal die.Deadend then as to second kind of metal die heating means, was heated 5 minutes down at 175 ℃.Subsequently, this mould is opened, with the microbubble body foam materials that obtains to have uniformly, well seals.This foam materials when just from mould, taking out, have with example 1 in the identical size of the finished product.
Claims (7)
1, a kind of method for preparing expanded polyolefin.This method is:
The first step is depressed adding, and will contain the foamable polyolefin-type resin combination heating regular hour of linking agent and chemical foaming agent, transfers pressure in the situation that reaches above-mentioned whipping agent and have part to decompose, make thus primary in the middle of foam product;
Second step, under barometric point, heat described elementary in the middle of foam product, the degree to certain of making it to foam is till making wherein whipping agent remain with a part to be under the undecomposed situation;
In the 3rd step, in a metal die and under the situation of pressurization, the foam product that second step was obtained further heats, and remaining whipping agent is decomposed, and without the cooling foam product, directly die sinking obtains good foam materials then.
2, according to the method for claim 1, the wherein said the first step comprises packs foamable polyolefin-type resin combination in the metal die that can tightly seal into, under the condition of pressurization, component in this mould is heated to 120-180 ℃, kept 10 to 50 minutes, put pressure when described composition is heated to when the whipping agent that wherein contains still has the undecomposed situation of 40-90%, from described metal die, take out primary middle foam product; Wherein second step comprise with above-mentioned primary in the middle of foam product be placed in the metal die that is heated to comparatively high temps, not have tightly to seal, under barometric point, primary foam product is heated to 140-200 ℃ indirectly, kept 10 to 50 minutes, make it further foaming, till the Undec degree of the whipping agent that wherein maintains 1-60%.
3, according to the method for claim 1, wherein said the 3rd step comprises and makes the foams that make in described second step, under the situation of in original mould, pressurizeing, continue heating down in 140-200 ℃, till remaining undecomposed whipping agent all decomposes, without cooling, directly open mould then.
4,, be a kind of metal die that can not deadend according to the process of claim 1 wherein that the metal die that uses is identical in described second step and the 3rd step.
5, according to the method for claim 4, wherein said can not deadend metal die be a kind of have above than the metal die of the casket shape of following bigger tapered sidewalls.
6, according to the method for claim 5, the metal die shell of wherein said casket shape has the passage that can introduce heating medium.
7, according to the method for claim 1, the preparation of wherein said foamable polyolefin-type resin combination, be in polyolefine, with used polyolefinic weight is 100 parts of calculating, add 2 to 40 parts the chemical foaming agent of calculating by weight, 0.05 to 5 part the linking agent of Suaning, and an amount of frothing aid by weight, pigment, and need the filler that adds sometimes.Then, these compositions are mixing even under 70-130 ℃ temperature.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60160366A JPS6221526A (en) | 1985-07-22 | 1985-07-22 | Manufacture of polyolefin foam |
| JP160366/85 | 1985-07-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86105767A true CN86105767A (en) | 1987-01-21 |
| CN1019400B CN1019400B (en) | 1992-12-09 |
Family
ID=15713419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86105767 Expired CN1019400B (en) | 1985-07-22 | 1986-07-21 | Method for manufacture of polyolefin foam |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS6221526A (en) |
| CN (1) | CN1019400B (en) |
| NZ (1) | NZ216807A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103648772A (en) * | 2011-05-17 | 2014-03-19 | 东丽塑料(美国)公司 | Crosslinked polypropylene foam and laminates made therefrom |
| WO2017096560A1 (en) * | 2015-12-09 | 2017-06-15 | 季国平 | Method for manufacturing polyolefin foam |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104721807A (en) * | 2015-04-13 | 2015-06-24 | 刘冬明 | Oral liquid for treating psoriasis |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6221525A (en) * | 1985-07-22 | 1987-01-29 | Sanwa Kako Kk | Manufacture of polyolefin foam |
-
1985
- 1985-07-22 JP JP60160366A patent/JPS6221526A/en active Granted
-
1986
- 1986-07-10 NZ NZ21680786A patent/NZ216807A/en unknown
- 1986-07-21 CN CN 86105767 patent/CN1019400B/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103648772A (en) * | 2011-05-17 | 2014-03-19 | 东丽塑料(美国)公司 | Crosslinked polypropylene foam and laminates made therefrom |
| CN103648772B (en) * | 2011-05-17 | 2016-02-03 | 东丽塑料(美国)公司 | Crosslinked polypropylene foam and the laminate made thereof |
| WO2017096560A1 (en) * | 2015-12-09 | 2017-06-15 | 季国平 | Method for manufacturing polyolefin foam |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6221526A (en) | 1987-01-29 |
| NZ216807A (en) | 1988-11-29 |
| JPH0367613B2 (en) | 1991-10-23 |
| CN1019400B (en) | 1992-12-09 |
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