CN109720063A - A kind of foaming PET film and preparation method thereof - Google Patents
A kind of foaming PET film and preparation method thereof Download PDFInfo
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Abstract
The present invention provides a kind of foaming PET film and preparation method thereof, the PET film has N number of repetition A/B structure, wherein prepared by following component for A layers: PET resin, chain extender, B layers are prepared by following component: PET resin, supercritical carbon dioxide form, and are prepared using microbedding coextrusion process.Foaming PET film heat-insulating provided by the invention is good, thickness is uniform, heat-resisting, has preferable flexibility, and the serialization at low cost that is suitable for is mass produced.
Description
Technical field
The invention belongs to functional film technical fields, more particularly, to a kind of foaming PET film and its preparation side
Method.
Background technique
With the progress of science and technology and the development of human society, energy and environmental problem becomes increasingly conspicuous, and light weight is melted into
The new demand that each application field proposes material manufacture, foamed plastics are exactly the product for complying with this development trend.Foam
Plastics are using plastics as matrix, wherein being filled with the composite material of a large amount of bubbles.The product category that foamed plastics can be prepared is very
It is more, but all because wherein with the presence of a large amount of bubbles the reason of, thus have many common properties: light weight, save material, unit
Specific strength is high, thermal conductivity is low, sound isolating and heat insulating performance is excellent, the valuable performance such as good that can absorb shock loading, cushion performance, therefore
And it is widely used as packaging, heat-insulated, anti-freezing and heat-insulating, buffering vibrationproof, quieter material, in building, transport, daily necessities, packaging
And the fields such as space flight, navigation, national defence have been widely used, foamed plastics oneself become material family in important composition
Part.
Polyethylene terephthalate (PET) is a kind of common thermoplastic engineering plastic, because having good insulation
Property, weatherability, rub resistance and higher elasticity modulus, are widely used in film, fibrous woven, vessel fabrication and packing timber
The fields such as material.Foaming PET sheet material of the PET resin by foaming preparation, can be effectively reduced the density and weight of PET sheet, substantially
The dielectric constant of PET sheet is reduced, dielectric loss reduces, and leakage current is reduced, while can also improve the reflectivity of PET sheet,
Thus foaming PET sheet material is widely used in manufacturing insulation cable, integrated circuit, liquid crystal display reflecting plate, packing container etc..
However since PET foaming process is difficult to control, thicker sheet material, plate can only be prepared, film aspect is due to existing
Cavity is more, and because of excessive tensile in foaming process or is added to nucleating agent, and PET crystallinity is higher, and material is more crisp, it is difficult to make
It is standby, limit in terms of application.
Summary of the invention
The main purpose of the present invention is to provide foaming PET film and preparation method thereof, the PET film thermal insulations of preparation
Well, thickness is uniform, heat-resisting, has preferable flexibility, and the serialization at low cost that is suitable for is mass produced.
To achieve the above objectives, the technical solution adopted by the present invention are as follows:
The present invention provides a kind of foaming PET film, has N number of repetition A/B structure, is wherein prepared by following component for A layers:
PET resin 99-99.5 parts by weight
Chain extender 0.5-1 parts by weight
B layers are prepared by following component:
100 parts by weight of PET resin
40 DEG C/8MPa-of supercritical carbon dioxide, 45 DEG C/10MPa
The upper and lower surface of the foaming PET film is A layers, 1 more than A layer number ratio B layer number.
The foaming PET film is microlayer films, and the number of plies is 101-201 layers.
The A layers of PET resin intrinsic viscosity is 0.65-0.82dl/g.
The B layers of PET resin intrinsic viscosity is 0.75-1.15dl/g.
The chain extender be phthalic anhydride, four acid anhydride of equal benzene, naphthalene tetramethyl acid anhydride, four acid anhydride of equal benzene, phthalic anhydride at least
It is a kind of.
Correspondingly, the present invention also provides a kind of preparation methods of foaming PET film, comprising the following steps: (1) will be described
99-99.5 parts by weight PET resin, 0.5-1 parts by weight chain extender are uniformly mixed, and obtain A layers of mixture, and corresponding extruder is added.
(2) the 100 parts by weight PET are added B layer corresponding extruder, and to 40 DEG C of extruder melt zone addition/
8MPa
The supercritical carbon dioxide of -45 DEG C/10MPa.
(3) by A layers, B layers of corresponding extruder, by microbedding co-extrusion, foaming PET film is made.
The extruder temperature is A floor: 220-245 DEG C of an area, two 250-255 DEG C of areas, three 255-260 DEG C of areas, 4th area
255-260 DEG C, five 260-265 DEG C of areas, 260-265 DEG C of filter；
B floor: 220-245 DEG C of an area, two 235-245 DEG C of areas, three 240-245 DEG C of areas, four 245-250 DEG C of areas, five area 245-
250 DEG C, 250-255 DEG C of filter；
Microbedding distributor temperature: 260-265 DEG C；
Microbedding distributor runner gap is not more than 0.3 micron, and A layers of corresponding gap are B layers of 1/3-1/4；
Die head temperature is 250-260 DEG C；
Slab temperature is 25-35 DEG C；
The utility model has the advantages that
The present invention provides a kind of foaming PET film and preparation method thereof, and compared with prior art, the present invention has following excellent
Different effect:
(1) foamed material is prepared using microbedding co-extrusion mode, can be more evenly distributed with foaming agent, diameter is smaller, obtains
The volume defect that foams is less.
(2) gathering for different layers foaming agent can effectively be obstructed by the PET resin after A layers of increasing stick by co-extrusion, it can
Every layer of coefficient of foaming is controlled, abscess connection is reduced.
(3) using supercritical carbon dioxide as foaming agent, not only environmental protection, can also reduce the plasticization temperature of PET, reduce
Energy consumption.
(4) the foaming PET film prepared using co-extrusion mode, since foaming orientation improves the crystallinity and power of B layers of PET
Performance is learned, the heat resistance and flexibility of foaming PET film is improved in this way, may be used as flexible package；A layers of outermost have heat-sealing
Property and good printing performance, have effectively expanded the application field of foaming PET film.
Therefore foaming PET film prepared by the present invention, good toughness, lyophily is good, has excellent heat resistance, is suitable for big rule
Mould production.
Specific embodiment
For a further understanding of the present invention, technical solution provided by the invention is carried out specifically below with reference to embodiment
Bright, protection scope of the present invention is not limited by the following examples.
Present invention PET as used in the following examples is provided by Changzhou China Resources.
Present invention chain extender phthalic anhydride as used in the following examples must come from the upper limited public affairs of seapeak Zhu trade
Department.
For the ease of comparing, the foaming PET film thickness of all embodiments is 100 microns.
Embodiment 1
Various raw materials are weighed according to mass parts ratio described below
A layers are prepared by following component
99 parts by weight of PET resin
1 parts by weight of phthalic anhydride
B layers are prepared by following component:
100 parts by weight of PET resin
40 DEG C/8MPa of supercritical carbon dioxide
The upper and lower surface of the foaming PET film is A layers, 1 more than A layer number ratio B layer number.
The foaming PET film is microlayer films, and the number of plies is 201 layers.
The A layers of PET resin intrinsic viscosity is 0.65dl/g.
The B layers of PET resin intrinsic viscosity is 0.75dl/g.
The preparation method of a kind of foaming PET film, comprising the following steps: (1) by the 99 parts by weight PET trees
Rouge, 1 parts by weight chain extender are uniformly mixed, and obtain A layers of mixture, and corresponding extruder is added.
(2) the 100 parts by weight PET are added B layer corresponding extruder, and to 40 DEG C of extruder melt zone addition/
The supercritical carbon dioxide of 8MPa.
(3) by A layers, B layers of corresponding extruder, by microbedding co-extrusion, foaming PET film is made.
The extruder temperature is A floor: 220 DEG C of an area, two 250 DEG C of areas, three 255 DEG C of areas, four 255 DEG C of areas, five areas 260
DEG C, 260 DEG C of filter；
B floor: 220 DEG C of an area, two 235 DEG C of areas, three 240 DEG C of areas, four 245 DEG C of areas, five 245 DEG C of areas, 250 DEG C of filter；
Microbedding distributor temperature: 260 DEG C；
0.05 micron of the lamellar spacing microbedding distributor A, 0.15 micron of the lamellar spacing B；
Die head temperature is 250 DEG C；
Slab temperature is 25 DEG C；
Embodiment 2
Various raw materials are weighed according to mass parts ratio described below
A layers are prepared by following component
99.5 parts by weight of PET resin
0.5 parts by weight of phthalic anhydride
B layers are prepared by following component:
100 parts by weight of PET resin
45 DEG C/10MPa of supercritical carbon dioxide
The upper and lower surface of the foaming PET film is A layers, 1 more than A layer number ratio B layer number.
The foaming PET film is microlayer films, and the number of plies is 101 layers.
The A layers of PET resin intrinsic viscosity is 0.82dl/g.
The B layers of PET resin intrinsic viscosity is 1.15dl/g.
The preparation method of a kind of foaming PET film, comprising the following steps: (1) by the 99.5 parts by weight PET trees
Rouge, 0.5 parts by weight chain extender are uniformly mixed, and obtain A layers of mixture, and corresponding extruder is added.
(2) B layers of corresponding extruder are added in the 100 parts by weight PET, and are added 40 DEG C 45 DEG C to extruder melt zone
The supercritical carbon dioxide of/10MPa.
(3) by A layers, B layers of corresponding extruder, by microbedding co-extrusion, foaming PET film is made.
The extruder temperature is A floor: 245 DEG C of an area, two 255 DEG C of areas, three 260 DEG C of areas, four 260 DEG C of areas, five areas 265
DEG C, 265 DEG C of filter；
B floor: 245 DEG C of an area, two 245 DEG C of areas, three 245 DEG C of areas, four 250 DEG C of areas, five 250 DEG C of areas, 255 DEG C of filter；
Microbedding distributor temperature: 265 DEG C；
0.075 micron of layer of microbedding distributor gap A, B layers are 0.3 micron；
Die head temperature is 260 DEG C；
Slab temperature is 35 DEG C；
Embodiment 3
Various raw materials are weighed according to mass parts ratio described below
A layers are prepared by following component
99.7 parts by weight of PET resin
0.3 parts by weight of phthalic anhydride
B layers are prepared by following component:
100 parts by weight of PET resin
42 DEG C/9MPa of supercritical carbon dioxide
The upper and lower surface of the foaming PET film is A layers, 1 more than A layer number ratio B layer number.
The foaming PET film is microlayer films, and the number of plies is 151 layers.
The A layers of PET resin intrinsic viscosity is 0.75dl/g.
The B layers of PET resin intrinsic viscosity is 1.04dl/g.
The preparation method of a kind of foaming PET film, comprising the following steps: (1) by the 99.7 parts by weight PET trees
Rouge, 0.3 parts by weight chain extender are uniformly mixed, and obtain A layers of mixture, and corresponding extruder is added.
(2) B layers of corresponding extruder are added in the 100 parts by weight PET, and are added 40 DEG C 42 DEG C to extruder melt zone
The supercritical carbon dioxide of/9MPa.
(3) by A layers, B layers of corresponding extruder, by microbedding co-extrusion, foaming PET film is made.
The extruder temperature is A floor: 240 DEG C of an area, two 252 DEG C of areas, three 258 DEG C of areas, four 258 DEG C of areas, five areas 262
DEG C, 262 DEG C of filter；
B floor: 241 DEG C of an area, two 243 DEG C of areas, three 243 DEG C of areas, four 246 DEG C of areas, five 246 DEG C of areas, 252 DEG C of filter；
Microbedding distributor temperature: 262 DEG C；
0.07 micron of layer of microbedding distributor gap A, B layers are 0.25 micron；
Die head temperature is 256 DEG C；
Slab temperature is 30 DEG C；
Embodiment 4
Various raw materials are weighed according to mass parts ratio described below
A layers are prepared by following component
100 parts by weight of PET resin
B layers are prepared by following component:
100 parts by weight of PET resin
42 DEG C/9MPa of supercritical carbon dioxide
The upper and lower surface of the foaming PET film is A layers, 1 more than A layer number ratio B layer number.
The foaming PET film is microlayer films, and the number of plies is 151 layers.
The A layers of PET resin intrinsic viscosity is 0.75dl/g.
The B layers of PET resin intrinsic viscosity is 1.04dl/g.
The preparation method of a kind of foaming PET film, comprising the following steps: (1) by the 99.7 parts by weight PET trees
Rouge, 0.3 parts by weight chain extender are uniformly mixed, and obtain A layers of mixture, and corresponding extruder is added.
(2) B layers of corresponding extruder are added in the 100 parts by weight PET, and are added 40 DEG C 42 DEG C to extruder melt zone
The supercritical carbon dioxide of/9MPa.
(3) by A layers, B layers of corresponding extruder, by microbedding co-extrusion, foaming PET film is made.
The extruder temperature is A floor: 240 DEG C of an area, two 252 DEG C of areas, three 258 DEG C of areas, four 258 DEG C of areas, five areas 262
DEG C, 262 DEG C of filter；
B floor: 241 DEG C of an area, two 243 DEG C of areas, three 243 DEG C of areas, four 246 DEG C of areas, five 246 DEG C of areas, 252 DEG C of filter；
Microbedding distributor temperature: 262 DEG C；
0.07 micron of layer of microbedding distributor gap A, B layers are 0.25 micron；
Die head temperature is 256 DEG C；
Slab temperature is 30 DEG C；
Embodiment 5
Various raw materials are weighed according to mass parts ratio described below
A layers are prepared by following component
99.7 parts by weight of PET resin
0.3 parts by weight of phthalic anhydride
B layers are prepared by following component:
100 parts by weight of PET resin
Carbon dioxide (gas)
The upper and lower surface of the foaming PET film is A layers, 1 more than A layer number ratio B layer number.
The foaming PET film is microlayer films, and the number of plies is 151 layers.
The A layers of PET resin intrinsic viscosity is 0.75dl/g.
The B layers of PET resin intrinsic viscosity is 1.04dl/g.
The preparation method of a kind of foaming PET film, comprising the following steps: (1) by the 99.7 parts by weight PET trees
Rouge, 0.3 parts by weight chain extender are uniformly mixed, and obtain A layers of mixture, and corresponding extruder is added.
(2) B layers of corresponding extruder are added in the 100 parts by weight PET, and carbon dioxide is added to extruder melt zone
Gas.
(3) by A layers, B layers of corresponding extruder, by microbedding co-extrusion, foaming PET film is made.
The extruder temperature is A floor: 240 DEG C of an area, two 252 DEG C of areas, three 258 DEG C of areas, four 258 DEG C of areas, five areas 262
DEG C, 262 DEG C of filter；
B floor: 241 DEG C of an area, two 243 DEG C of areas, three 243 DEG C of areas, four 246 DEG C of areas, five 246 DEG C of areas, 252 DEG C of filter；
Microbedding distributor temperature: 262 DEG C；
0.07 micron of layer of microbedding distributor gap A, B layers are 0.25 micron；
Die head temperature is 256 DEG C；
Slab temperature is 30 DEG C；
Embodiment 6
Various raw materials are weighed according to mass parts ratio described below
B layers are prepared by following component:
100 parts by weight of PET resin
42 DEG C/9MPa of supercritical carbon dioxide
The B layers of PET resin intrinsic viscosity is 1.04dl/g.
(1) B layers of corresponding extruder are added in the 100 parts by weight PET, and are added 40 DEG C 42 DEG C to extruder melt zone
The supercritical carbon dioxide of/9MPa.
(2) foaming PET film is made in B layers of corresponding extruder.
B floor: 241 DEG C of an area, two 243 DEG C of areas, three 243 DEG C of areas, four 246 DEG C of areas, five 246 DEG C of areas, 252 DEG C of filter；
Die head temperature is 256 DEG C；
Slab temperature is 30 DEG C；
The foaming PET film of 1-6 of the embodiment of the present invention is detected respectively, the results are shown in Table 1.
The foaming PET film performance test result of 1 1-3 of the embodiment of the present invention of table preparation
Embodiment 4-7 test result such as table 2
Table 2
It can be seen that foaming PET film prepared by the present invention with preferable power from the corresponding test result of embodiment 1-3
Performance, thermal stability, the thickness uniformity, printing and heat sealability are learned, can be suitably used for the purposes such as packaging, and product of the present invention density
It is small to can be improved heat-proof quality.
The chain extender that embodiment 4-6 test result can be seen that A layers from table 2 is capable of the viscosity of REINFORCED PET, Neng Gouyou
Connection between B layers of effect isolation, reduces cell diameter, and the foaming effect of B layers of control avoids reducing the property of film because abscess is excessive
Energy.Supercritical carbon dioxide can be quickly and effectively diffused in PET melt, and involvement amount is greater than atmospheric carbon dioxide, be used
The density of atmospheric carbon dioxide film is larger, and cell diameter is big, it is difficult to reach foaming effect.A layers of thickening PET resin are not used to make
For coextruded layer, carbon dioxide can expand rapidly melt upon exiting the die, and film thickness is caused to fluctuate larger, inner cell diameter
Uniformity reduces, and causes mechanical property to weaken, wetting tension is also reduced because surface defect is more, is unfavorable for the print of flexible package
Brush.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and what is described in the above embodiment and the description is only the present invention
Principle, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these variation and
Improvement is both fallen in the range of claimed invention.The present invention claims protection scope by appended claims and its
Equivalent defines.
Claims (11)
1. a kind of foaming PET film has N number of repetition A/B structure, is wherein prepared by following component for A layers:
PET resin 99-99.5 parts by weight
Chain extender 0.5-1 parts by weight
B layers are prepared by following component:
100 parts by weight of PET resin
40 DEG C/8MPa-of supercritical carbon dioxide, 45 DEG C/10MPa.
2. the upper and lower surface of foaming PET film according to claim 1 is A layers, 1 more than A layer number ratio B layer number.
3. foaming PET film is microlayer films according to claim 1, the number of plies is 101-201 layers.
4. the A layers of PET resin intrinsic viscosity is 0.65-0.82 dl/g according to claim 1.
5. B layers of PET resin intrinsic viscosity are 0.75-1.15dl/g according to claim 1.
6. chain extender is phthalic anhydride, four acid anhydride of equal benzene, naphthalene tetramethyl acid anhydride, four acid anhydride of equal benzene, adjacent benzene two according to claim 1
Formic anhydride is at least one.
7. a kind of preparation method of foaming PET film, comprising the following steps: (1) by the 99-99.5 parts by weight PET resin,
0.5-1 parts by weight chain extender is uniformly mixed, and obtains A layers of mixture, and corresponding extruder is added；
(2) B layers of corresponding extruder are added in the 100 parts by weight PET, and 40 DEG C/8MPa-is added to extruder melt zone
The supercritical carbon dioxide of 45 DEG C/10MPa；
(3) by A layers, B layers of corresponding extruder, foaming PET film is obtained by microbedding co-extrusion.
8. extruder temperature according to claim 7 is A floor: 220-245 DEG C of an area, two 250-255 DEG C of areas, three area 255-
260 DEG C, four 255-260 DEG C of areas, five 260-265 DEG C of areas, 260-265 DEG C of filter；
B floor: 220-245 DEG C of an area, two 235-245 DEG C of areas, three 240-245 DEG C of areas, four 245-250 DEG C of areas, five area 245-250
DEG C, 250-255 DEG C of filter.
9. a kind of preparation method of foaming PET film according to claim 7, the microbedding distribution that wherein microbedding co-extrusion uses
Device temperature: 260-265 DEG C.
10. microbedding distributor according to claim 9, runner gap is not more than 0.3 micron, and A layers of corresponding gap are B
Layer 1/3-1/4.
11. according to a kind of preparation method of foaming PET film of claim 7, the die head temperature that wherein microbedding co-extrusion uses for
250-260 DEG C, slab temperature is 25-35 DEG C.
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Cited By (1)
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| CN114571819A (en) * | 2022-01-20 | 2022-06-03 | 升辉新材料股份有限公司 | Puncture-resistant packaging film and preparation method thereof |
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Application publication date: 20190507 |