CN103963400A - Supercritical gas PP physical foaming sheet and production technology thereof - Google Patents
Supercritical gas PP physical foaming sheet and production technology thereof Download PDFInfo
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- CN103963400A CN103963400A CN201310338508.8A CN201310338508A CN103963400A CN 103963400 A CN103963400 A CN 103963400A CN 201310338508 A CN201310338508 A CN 201310338508A CN 103963400 A CN103963400 A CN 103963400A
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- supercritical gas
- foaming
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- Y02P20/121—
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to the field of plastic foaming, and especially relates to a supercritical gas PP physical foaming sheet and a production technology thereof. The sheet comprises a PP foaming layer at the middle and an outer layer which are connected through a hot-melt adhesive. The production technology comprises the following steps: fusing a raw material and extruding; adding a supercritical gas and fully mixing fusing; performing rapid pressure reducing; shaping, stabilizing and curing to prepare the supercritical gas PP physical foaming sheet. The prepared foaming sheet has the advantages of being high in foaming ratio, high in heat-insulation performance, good in mechanical strength, energy-saving, environment-friendly, degradable, recoverable, reusable, low in raw material cost, resistant to heat, resistant to moisture, resistant to compression, resistant to deformation, good in sound-insulation performance, and the like.
Description
Technical field
The present invention relates to plastic foamed field, relate in particular to a kind of supercritical gas PP physical blowing sheet material and production technology thereof.
Background technology
In the processing industry of plastic products; people are seeking to adapt to the new method of modern processing always; thereby reach the object that saves time, increases benefit protection of the environment, so the research and development utilization of plastic products is also just towards the higher future development of environmental protection, safety, light weight and cost performance.Polypropylene (PP) foaming plate grows up just under these circumstances, is the focus of domestic novel plastic expanded material research and development aspect in recent years always.PP foaming plate has that quality is light, cost is low, intensity is high, sound insulation, can absorb the advantages such as a large amount of impact energys, is widely used in the materials such as packing, transportation, automobile, insulation, building.Raising along with government's improvement " white pollution " dynamics, PS expanded material can progressively be withdrawn from the market, and the chemical constitution of PP determines that its degradation property is better than PE and PS, the special performances such as the shock-absorbing capacity of good heat resistance, excellence and easily degraded are developed rapidly PP foaming plate at home and abroad.
Polyacrylic foaming technique difficulty is more much larger than PE, PS.The temperature that polypropylene is applicable to foaming is 4 ℃, near processing temperature, the melt strength of PP (performance of melt stretch-proof) and the non-constant of elasticity, when temperature rises to after melt temperature, the melt of PP sharply declines by force, lower melt strength cannot guarantee the effect of the tensile stress that in bubble growth process, cell wall is born, cause Bubble formation to cave in and break, to such an extent as to the percent opening of PP foam is very high, cannot meet instructions for use, therefore improve polyacrylic expandable, just and must improve polyacrylic melt strength.
Melt strength refers to the intensity of the weight of polymer melt energy support own, has reflected the ability of melt resistance bubble stretching and shearing.Its influence factor comprises the elastic recovery characteristic of molecular structure, melt viscosity, molten hang down time, surface tension, melt etc.
Increase the following three kinds of methods of the general employing of melt strength at present both at home and abroad:
The first, is used the high body intensity polypropylene HMSPP that melts, and adopts new catalyst and reactor technology, its molecular mass is distributed and widen or branched p 0 lypropylene increase melt strength.It is very high that shortcoming is that height melts strong polyacrylic cost, is unfavorable for extensive use;
The second, polypropylene is partial cross-linked, uses chemical cross-linking agent by the partial cross-linked increase melt strength of polypropylene.Shortcoming is that the control of the degree of cross linking is difficult, and the existence of gel has affected recycling, and has chemical residual, cannot bring into play the advantage performance of PP, and technique is difficult to be controlled, and easily blasts;
The third, polypropylene carries out blending and modifying, by carrying out blend with other PE or easy expanded material material, increases melt strength.Shortcoming is to reduce mechanical property and the resistance to elevated temperatures of PP expanded material, makes foamed plastics lose due advantage, cannot utilize its advantage.
Summary of the invention
The object of the present invention is to provide a kind of supercritical gas PP physical blowing sheet material and production technology thereof, solve the defect that prior art exists.
In order to realize above-mentioned object, adopt following technical scheme: a kind of supercritical gas PP physical blowing sheet material, PP foaming flaggy and the skin of described sheet material in the middle of comprising, is connected by PUR between PP foaming flaggy and skin.
In such scheme, described PP foaming flaggy is supercritical gas PP physical blowing plate.Described skin comprises the upper and lower.Described upper strata is plank, plastic plate or moulds plank, and described lower floor is plank, plastic plate or moulds plank.
A production technology for supercritical gas PP physical blowing sheet material, described production technology comprises the following steps:
S1 is by material melting and extrude;
S2 adds supercritical gas abundant mixed melting;
S3 reduction of blood pressure in high-speed;
S4 moulding, stable, solidify, make supercritical gas PP physical blowing plate.
In such scheme, described supercritical gas is supercritical carbon dioxide.
Compared with prior art, the present invention have that expansion ratio is high, heat-proof quality is high, mechanical strength is good, energy-conserving and environment-protective, the recyclable recycling of degradable, the advantage such as cost of material is low, heatproof is moisture resistance, resistance to compression resistance to deformation, sound insulation value are good.
Accompanying drawing explanation
Fig. 1 is the structural representation of this foaming plate.
The specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
The structure of this foaming plate as shown in Figure 1, comprise PP foaming flaggy 1, upper strata 2 and lower floor 3, PP foaming flaggy is supercritical gas PP physical blowing plate, and upper strata 2 and lower floor 3 can select plank, plastic plate or mould the sheet materials such as plank, and is connected with PP foaming flaggy 1 by PUR.
The technological process of production of supercritical gas PP physical blowing plate is: material is added by hopper, by conveying and the melting of screw rod, the gas that source of the gas is supplied with is conveyed in extruder by measuring pump continuously and stably, by melt extruding of twin-screw, the abundant mixed melting of Series Sheet screw extruder, accelerating gas is fully dissolved in polymer melt, homogeneous phase solution with fused materials formation polymer melt/gas, then pass through reduction of blood pressure in high-speed, make melt pressure fast-descending, in melt, dissolved gases reaches oversaturated labile state, moment forms a large amount of small nuclei of bubbles, then abscess is grown up, the melt that contains a large amount of bubbles flows into shaped device moulding stable and curing at sizing mouthful mould, obtain foaming plate.
If make composite plate, only PUR need be coated in supercritical gas PP physical blowing plate two sides, and be connected pressing with various sheet material.
Claims (6)
1. a supercritical gas PP physical blowing sheet material, is characterized in that, PP foaming flaggy and the skin of described sheet material in the middle of comprising is connected by PUR between PP foaming flaggy and skin.
2. sheet material according to claim 1, is characterized in that, described PP foaming flaggy is supercritical gas PP physical blowing plate.
3. sheet material according to claim 1, is characterized in that, described skin comprises the upper and lower.
4. sheet material according to claim 3, is characterized in that, described upper strata is plank, plastic plate or moulds plank, and described lower floor is plank, plastic plate or moulds plank.
5. a production technology for supercritical gas PP physical blowing sheet material, is characterized in that, described production technology comprises the following steps:
S1 is by material melting and extrude;
S2 adds supercritical gas abundant mixed melting;
S3 reduction of blood pressure in high-speed;
S4 moulding, stable, solidify, make supercritical gas PP physical blowing plate.
6. production technology according to claim 5, is characterized in that, described supercritical gas is supercritical carbon dioxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310338508.8A CN103963400A (en) | 2013-08-06 | 2013-08-06 | Supercritical gas PP physical foaming sheet and production technology thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310338508.8A CN103963400A (en) | 2013-08-06 | 2013-08-06 | Supercritical gas PP physical foaming sheet and production technology thereof |
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| CN103963400A true CN103963400A (en) | 2014-08-06 |
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| CN201310338508.8A Pending CN103963400A (en) | 2013-08-06 | 2013-08-06 | Supercritical gas PP physical foaming sheet and production technology thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108001849A (en) * | 2017-12-28 | 2018-05-08 | 东莞市亿铄五金塑胶制品有限公司 | A kind of ventilative degradable package plate, ventilative degradable package material and preparation method |
| CN110439219A (en) * | 2018-05-04 | 2019-11-12 | 浙江晶通塑胶有限公司 | Fretting map plastic floor and its production technology |
| CN110549707A (en) * | 2019-08-16 | 2019-12-10 | 阜阳楹烽光电材料有限公司 | Foamed polypropylene composite sheet and preparation method thereof |
| CN111100467A (en) * | 2018-10-26 | 2020-05-05 | 中国石油化工股份有限公司 | Medium-density fiberboard prepared by using cellulosic ethanol waste residues and preparation method thereof |
| CN114181516A (en) * | 2021-12-13 | 2022-03-15 | 福建恩迈特新材料有限公司 | TPU foaming composition, foaming material and preparation method thereof |
-
2013
- 2013-08-06 CN CN201310338508.8A patent/CN103963400A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108001849A (en) * | 2017-12-28 | 2018-05-08 | 东莞市亿铄五金塑胶制品有限公司 | A kind of ventilative degradable package plate, ventilative degradable package material and preparation method |
| CN110439219A (en) * | 2018-05-04 | 2019-11-12 | 浙江晶通塑胶有限公司 | Fretting map plastic floor and its production technology |
| CN111100467A (en) * | 2018-10-26 | 2020-05-05 | 中国石油化工股份有限公司 | Medium-density fiberboard prepared by using cellulosic ethanol waste residues and preparation method thereof |
| CN111100467B (en) * | 2018-10-26 | 2022-02-08 | 中国石油化工股份有限公司 | Medium-density fiberboard prepared by using cellulosic ethanol waste residues and preparation method thereof |
| CN110549707A (en) * | 2019-08-16 | 2019-12-10 | 阜阳楹烽光电材料有限公司 | Foamed polypropylene composite sheet and preparation method thereof |
| CN114181516A (en) * | 2021-12-13 | 2022-03-15 | 福建恩迈特新材料有限公司 | TPU foaming composition, foaming material and preparation method thereof |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140806 |