CN104497506B - A kind of PHA for smart card prints diaphragm and preparation method thereof - Google Patents
A kind of PHA for smart card prints diaphragm and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of PHA for smart card and print diaphragm and preparation method thereof, does this diaphragm comprise the composition of following mass percent: PHA resin 30-40? wt%, PETG resin 48-55wt%, polyethylene wax 1.1-2.5wt%, calcium sulfate crystal whiskers 1.4-2wt%, PETG resin processing aid 2.6-3.5wt%, softening agent 0.1-0.4wt%, lubricant 0.1-1wt%, oxidation inhibitor 0.1-0.5wt%, expanding material 4.5-5.6wt%, UV light absorber 0.3-0.5? wt%, static inhibitor 0.3-0.5? wt%.This diaphragm adopts rolling process preparation, and printing diaphragm of the present invention can delustring, makes smart card form soft matte effect.
Description
Technical field
The invention belongs to thermoplastic polyester technical field, be specifically related to a kind of PHA for smart card and print diaphragm and preparation method thereof.
Background technology
Smart card is according to communication interface mode; be divided into Contact Type Ic Card (IntegratedCircuitCard integrated circuit card; also claim Smartcard smart card), contactless rfid card (RadioFrequencyIdentification radio-frequency identification card) and double-interface card (simultaneously possessing IC-card and rfid card communication interface); they are all that microelectronic chip is embedded base material; and completing printing, the facial mask protection of card face, final layer is pressed into.Therefore smart card is base material, prints diaphragm and protect diaphragm to stack gradually rear pressing and make.
Smart card becomes card mode to be justifying printing, and the number of cards of namely printing on diaphragm is equal with the chip typesetting number of inlay, prints lamination again, is die-cut into card.Justifying printing requires very high to printing quality, IC chip price accounts for smart card total cost more than 60%, and card matrix material accounts for total cost less than 5%, if card matrix material causes smart card to cancel because of quality problems, loss is comparatively large, so smart card high rate of finished products is particularly important.
PETG, it is a kind of non-crystalline type copolyesters, by terephthalic acid (PTA), ethylene glycol (EG) and 1,4-cyclohexanedimethanol (CHDM) three kinds of monomers product of ester-interchange method polycondensation, in its production process, due to the ethylene glycol of some amount replace by CHDM, can crystallization be prevented, and then improve processing and manufacturing and transparency.Its goods highly transparent, excellent shock resistance, suitable especially shaping heavy wall transparent article, its machine-shaping property is splendid, the design of arbitrary shape can be carried out according to the intention of planner, may adopt traditional to extrude, injection moulding, the forming method such as blowing and plastic uptake, can be widely used in sheet material, sheet material, high-performance shrink film, bottle with and the market such as profiled material, its suitability for secondary processing is excellent simultaneously, can carry out conventional machining modification.
PHA, polyhydroxyalkanoate, the PHA film of prior art is generally used for non-returnable container sheet, printed sheet, cosmetic sheet, lacks quality control index, can't meet the particular requirement of Intelligent card package.
Printing is that smart card makes secondary processing important step, and printing diaphragm Roughness Surface on Control is most important, and too high roughness can affect printed patterns sharpness, and crossing low roughness can affect ink and the conjugation printing diaphragm.The printing diaphragm coating rear surface precipitate of smart card is many, and laminated rear stripping strength is little; Expansion and contraction is large; Open bubble trace is many, and wetting tension is little, cannot accurate print; Visual defects causes printability not good; Be difficult to the following product of production 300 micron thickness; Opacifying property is poor, easily sees the IC chip and antenna inlayed in card.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of PHA for smart card to print diaphragm and preparation method thereof, printing effect is good, possesses good bond properties and deflection.
The present invention is by the following technical solutions:
A kind of PHA for smart card prints diaphragm, comprise the composition of following mass percent: PHA resin 30-40wt%, PETG resin 48-55wt%, polyethylene wax 1.1-2.5wt%, calcium sulfate crystal whiskers 1.4-2wt%, PETG resin processing aid 2.6-3.5wt%, softening agent 0.1-0.4wt%, lubricant 0.1-1wt%, oxidation inhibitor 0.1-0.5wt%, expanding material 4.5-5.6wt%, UV light absorber 0.3-0.5wt%, static inhibitor 0.3-0.5wt%, each Ingredient percent sum is 100wt%.
As preferably, described PHA resin is the P34HB of Tianjin Green Biomaterial Co., Ltd., and described PETG resin is the GS2 of Yi Shi Man of the U.S..
As preferably, described PETG resin processing aid is the ADD2 of Yi Shi Man of the U.S..
As preferably, described softening agent is hexanodioic acid propanediol polyester or sebacic acid propanediol polyester.
As preferably, described lubricant is ethylene bis stearamide or oleylamide.
Described oxidation inhibitor is a kind of oxidation inhibitor with the efficient low look dirt of excellent compatibility, preferred irgasfos 168 or antioxidant 264.Antioxidant 264 is C
15h
24o, irgasfos 168 is three (2,4-di-tert-butyl-phenyl) phosphorous acid ester.
Described expanding material is the styrenic reactive resin of the epoxy-functional with high reaction activity, the SAG005 of preferred Rizhisheng New Technology Development Co., Ltd., Shanghai.
Described UV light absorber is low volatility UV light absorber, preferred salicylic acid phenyl ester or Octabenzone.
As preferably, described static inhibitor is polyoxyethylene alkyl amine.
The above-mentioned PHA for smart card prints the preparation method of diaphragm, comprises the following steps:
(1) take raw material to mix, wherein, PHA resin, PETG resin-oatmeal are dry after being broken to 70-80 order;
(2) high-speed stirring after heating and melting, whipping temp is 85-95 DEG C, high-speed stirring is in three stages: the first stage is 800-900 rev/min, churning time is 5-8 minute, subordinate phase is 1600-1800 rev/min, churning time is 3-4 minute, and the phase III is 800-900 rev/min, and churning time is 3-5 minute;
(3) stirring at low speed, whipping temp is 40-50 DEG C, and stirring velocity is 60-80 rev/min, and churning time is 15-20 minute;
(4) planet degassing extruder is plasticated: temperature controls at 110-165 DEG C, wherein one-level 110-140 DEG C, secondary 135-165 DEG C; Screw speed is 25-45rpm; Vacuum station rate of air sucked in required is 60m
3/ h, vacuum tightness is 60mbar, and negative pressure is 0.1bar;
(5) five roller rolling out films: roller speed 5-25m/ minute, speed ratio is 1.15-1.25, and stack temperature is respectively: No. 1 roller 110-140 DEG C, No. 2 roller 110-140 DEG C, No. 3 roller 120-160 DEG C, No. 4 roller 140-175 DEG C, No. 5 roller 145-160 DEG C;
(6) stretching is deflected from: doff roll temperature is: first group of 120-130 DEG C, second group of 115-125 DEG C, the 3rd group of 105-115 DEG C, the 4th group of 90-100 DEG C, the 5th group of 70-80 DEG C;
(7) cool: cooling temperature is: first group of 60-70 DEG C, second group of 50-60 DEG C, the 3rd group of 40-50 DEG C; Circulating water;
(8) draw, batch;
(9) photograph detects, automatic sorting or mark;
(10) cut: squareness dip deviation≤1.2mm/m.
Wherein, raw material pulverizing employing Chinese Patent Application No. is " a kind of high efficient mill powder system " of " 2013201822894 ", improves unit output, and can reduce the generation of abrasive dust Jiao material.Fusion plastification adopts planetary degassing extruder, install additional " a kind of vacuum separation unit reducing topsoil volatile matter and gas " that Chinese Patent Application No. is " 2009202843552 ", reduce auxiliary agent volatile matter to the impact of sheet material apparent mass, and ensure execute-in-place environment.No. three rollers install additional " cutting air bubble machine " that Chinese Patent Application No. is " 2010201132857 ", adopt de-bubbled technique, reduce bubble impression and produce.Replace manual sorting with " take a picture and detect and sorting system ", effectively can improve unacceptable product recall rate and sorting efficiency.
As preferably, the thickness of printing diaphragm is 120 μm ± 5 μm.
The present invention compared with prior art, has following beneficial effect:
1, the present invention on the basis of existing technology, adds efficient abrasive dust, forcing machine vacuum station, cuts air bubble machine, takes a picture and detect into production control method such as automatic sorting devices, effectively can reduce the scrap rate of product, improve output capacity.Adopt electrofax to detect and substitute manual detection, standard is objective, reduces personal errors, improves conforming product rate, and downstream fabrication enterprise intelligent card encapsulation yield rate is high.
2, printing diaphragm of the present invention can delustring, makes smart card form soft matte effect.
3, opacifying property of the present invention is good, can cover IC chip and antenna that smartcard internal inlays, make smart card specious.
4, because printing needs 3-5 kind ink chromatography, therefore have to pass through 3-5 heating (oven dry), excessive shrinking percentage or the irregular meeting of shrinking percentage make pattern chromatography inaccurate, thus affect printing quality, and shrinking percentage of the present invention is little, and only 10% ~ 11%.
Accompanying drawing explanation
Fig. 1 is manufacturing process flow diagram of the present invention.
Embodiment
Be further described in detail below in conjunction with to the present invention.
The calendering formation machine adopted in following examples is that forming machine (axle interior extrapolation) is prolonged in the roll-in of Italian RODOLFO company F type five, No. three stacks have installed additional and have cut bubble assembly, forcing machine adopts the planetary degassing extruder of German bass holder husband, and type of heating is electrically heated.
In embodiment, PHA resin used provides for Tianjin Green Biomaterial Co., Ltd., and PETG resin is U.S. Yi Shi Man GS-2 type, and PETG resin processing aid is U.S. Yi Shi Man ADD2 type.The size of sheet material is controlled by stack roller spacing, and for the ease of Performance comparision, controlling sheet thickness in following examples is 120 μm.
Embodiment 1
A kind of PHA for smart card prints diaphragm, comprise the composition of following mass percent: PHA resin 40wt%, PETG resin 48wt%, polyethylene wax 1.1%, calcium sulfate crystal whiskers 2wt%, PETG resin processing aid 3.5wt%, softening agent 0.1wt%, lubricant 0.1wt%, oxidation inhibitor 0.1wt%, expanding material 4.5wt%, UV light absorber 0.3wt%, static inhibitor 0.3wt%.
Described softening agent is hexanodioic acid propanediol polyester.
Described lubricant is ethylene bis stearamide.
Described oxidation inhibitor is irgasfos 168.
Described expanding material is the SAG005 of Rizhisheng New Technology Development Co., Ltd., Shanghai.
Described UV light absorber is salicylic acid phenyl ester.
Described static inhibitor is polyoxyethylene alkyl amine.
The above-mentioned PHA for smart card prints the preparation method of diaphragm, comprises the following steps:
(1) take raw material to mix, wherein, PHA resin, PETG resin-oatmeal are dry after being broken to 70-80 order;
(2) high-speed stirring after heating and melting, whipping temp is 85-95 DEG C, high-speed stirring is in three stages: the first stage is 800-900 rev/min, churning time is 5-8 minute, subordinate phase is 1600-1800 rev/min, churning time is 3-4 minute, and the phase III is 800-900 rev/min, and churning time is 3-5 minute;
(3) stirring at low speed, whipping temp is 40-50 DEG C, and stirring velocity is 60-80 rev/min, and churning time is 15-20 minute;
(4) planet degassing extruder is plasticated: temperature controls at 110-165 DEG C, wherein one-level 110-140 DEG C, secondary 135-165 DEG C; Screw speed is 25-45rpm; Vacuum station rate of air sucked in required is 60m
3/ h, vacuum tightness is 60mbar, and negative pressure is 0.1bar.
(5) five roller rolling out films: roller speed 5-25m/ minute, speed ratio is 1.15-1.25, and stack temperature is respectively: No. 1 roller 110-140 DEG C, No. 2 roller 110-140 DEG C, No. 3 roller 120-160 DEG C, No. 4 roller 140-175 DEG C, No. 5 roller 145-160 DEG C;
(6) stretching is deflected from: doff roll temperature is: first group of 120-130 DEG C, second group of 115-125 DEG C, the 3rd group of 105-115 DEG C, the 4th group of 90-100 DEG C, the 5th group of 70-80 DEG C;
(7) cool: cooling temperature is: first group of 60-70 DEG C, second group of 50-60 DEG C, the 3rd group of 40-50 DEG C; Circulating water;
(8) draw, batch;
(9) photograph detects, automatic sorting or mark;
(10) cut: squareness dip deviation≤1.2mm/m.
Embodiment 2
A kind of PHA for smart card prints diaphragm, comprise the composition of following mass percent: PHA resin 30wt%, PETG resin 55wt%, polyethylene wax 2.5wt%, calcium sulfate crystal whiskers 1.4wt%, PETG resin processing aid 2.6wt%, softening agent 0.4wt%, lubricant 1wt%, oxidation inhibitor 0.5wt%, expanding material 5.6wt%, UV light absorber 0.5wt%, static inhibitor 0.5wt%.
Described softening agent is sebacic acid propanediol polyester.
Described lubricant is oleylamide.
Described oxidation inhibitor is antioxidant 264.
Described expanding material is the SAG005 of Rizhisheng New Technology Development Co., Ltd., Shanghai.
Described UV light absorber is Octabenzone.
Described static inhibitor is polyoxyethylene alkyl amine.
The above-mentioned PHA for smart card prints the preparation method of diaphragm, comprises the following steps:
(1) take raw material to mix, wherein, PHA resin, PETG resin-oatmeal are dry after being broken to 70-80 order;
(2) high-speed stirring after heating and melting, whipping temp is 85-95 DEG C, high-speed stirring is in three stages: the first stage is 800-900 rev/min, churning time is 5-8 minute, subordinate phase is 1600-1800 rev/min, churning time is 3-4 minute, and the phase III is 800-900 rev/min, and churning time is 3-5 minute;
(3) stirring at low speed, whipping temp is 40-50 DEG C, and stirring velocity is 60-80 rev/min, and churning time is 15-20 minute;
(4) planet degassing extruder is plasticated: temperature controls at 110-165 DEG C, wherein one-level 110-140 DEG C, secondary 135-165 DEG C; Screw speed is 25-45rpm; Vacuum station rate of air sucked in required is 60m
3/ h, vacuum tightness is 60mbar, and negative pressure is 0.1bar.
(5) five roller rolling out films: roller speed 5-25m/ minute, speed ratio is 1.15-1.25, and stack temperature is respectively: No. 1 roller 110-140 DEG C, No. 2 roller 110-140 DEG C, No. 3 roller 120-160 DEG C, No. 4 roller 140-175 DEG C, No. 5 roller 145-160 DEG C;
(6) stretching is deflected from: doff roll temperature is: first group of 120-130 DEG C, second group of 115-125 DEG C, the 3rd group of 105-115 DEG C, the 4th group of 90-100 DEG C, the 5th group of 70-80 DEG C;
(7) cool: cooling temperature is: first group of 60-70 DEG C, second group of 50-60 DEG C, the 3rd group of 40-50 DEG C; Circulating water;
(8) draw, batch;
(9) photograph detects, automatic sorting or mark;
(10) cut: squareness dip deviation≤1.2mm/m.
Embodiment 3
A kind of PHA for smart card prints diaphragm, comprise the composition of following mass percent: PHA resin 37.1wt%, PETG resin 50wt%, polyethylene wax 1.7wt%, calcium sulfate crystal whiskers 1.6wt%, PETG resin processing aid 2.9wt%, softening agent 0.3wt%, lubricant 0.5wt%, oxidation inhibitor 0.3wt%, expanding material 4.8wt%, UV light absorber 0.4wt%, static inhibitor 0.4wt%.
Described softening agent is sebacic acid propanediol polyester.
Described lubricant is ethylene bis stearamide.
Described oxidation inhibitor is antioxidant 264.
Described expanding material is the SAG005 of Rizhisheng New Technology Development Co., Ltd., Shanghai.
Described UV light absorber is salicylic acid phenyl ester.
Described static inhibitor is polyoxyethylene alkyl amine.
The above-mentioned PHA for smart card prints the preparation method of diaphragm, comprises the following steps:
(1) take raw material to mix, wherein, PHA resin, PETG resin-oatmeal are dry after being broken to 70-80 order;
(2) high-speed stirring after heating and melting, whipping temp is 85-95 DEG C, high-speed stirring is in three stages: the first stage is 800-900 rev/min, churning time is 5-8 minute, subordinate phase is 1600-1800 rev/min, churning time is 3-4 minute, and the phase III is 800-900 rev/min, and churning time is 3-5 minute;
(3) stirring at low speed, whipping temp is 40-50 DEG C, and stirring velocity is 60-80 rev/min, and churning time is 15-20 minute;
(4) planet degassing extruder is plasticated: temperature controls at 110-165 DEG C, wherein one-level 110-140 DEG C, secondary 135-165 DEG C; Screw speed is 25-45rpm; Vacuum station rate of air sucked in required is 60m
3/ h, vacuum tightness is 60mbar, and negative pressure is 0.1bar.
(5) five roller rolling out films: roller speed 5-25m/ minute, speed ratio is 1.15-1.25, and stack temperature is respectively: No. 1 roller 110-140 DEG C, No. 2 roller 110-140 DEG C, No. 3 roller 120-160 DEG C, No. 4 roller 140-175 DEG C, No. 5 roller 145-160 DEG C;
(6) stretching is deflected from: doff roll temperature is: first group of 120-130 DEG C, second group of 115-125 DEG C, the 3rd group of 105-115 DEG C, the 4th group of 90-100 DEG C, the 5th group of 70-80 DEG C;
(7) cool: cooling temperature is: first group of 60-70 DEG C, second group of 50-60 DEG C, the 3rd group of 40-50 DEG C; Circulating water;
(8) draw, batch;
(9) photograph detects, automatic sorting or mark;
(10) cut: squareness dip deviation≤1.2mm/m.
Comparative example 1
Identical with embodiment 1, difference is: do not add polyethylene wax.
Performance test
Performance contrast test is carried out to above-mentioned 3 embodiments and comparative example 1, the results are shown in Table 1.
Table 1
Test result shows, PHA smart card printing diaphragm shading rate of the present invention is 93.7% ~ 94.6%, glossiness is 15.4 ~ 16.1, expansion and contraction is 10% ~ 11%, stripping strength after laminated is 13.9N/cm ~ 15.3N/cm, and the shading rate of comparative example 1 is 76.3%, and glossiness is 36, expansion and contraction is 30%, and the stripping strength after laminated is 3.5N/cm.Therefore, stripping strength of the present invention is obviously greater than comparative example 1, not easily peels off cracking; Shading rate is high, glossiness is lower, and surface is in dumb light gloss; Expansion and contraction is less, can avoid curling damage; The defect sizes such as surface hole defect, impurity, brilliant point are less than 0.3mm, Ge Shuo≤1/m
2.Polyethylene wax substantially increases stripping strength, the shading rate of printing diaphragm, reduces the expansion and contraction of printing diaphragm.
The above; be only the present invention's preferably specific embodiments; protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, the simple change of the technical scheme that can obtain apparently or equivalence are replaced and are all fallen within the scope of protection of the present invention.
Claims (9)
1. the PHA for smart card prints diaphragm, it is characterized in that, comprise the composition of following mass percent: PHA resin 30-40wt%, PETG resin 48-55wt%, polyethylene wax 1.1-2.5wt%, calcium sulfate crystal whiskers 1.4-2wt%, PETG resin processing aid 2.6-3.5wt%, softening agent 0.1-0.4wt%, lubricant 0.1-1wt%, oxidation inhibitor 0.1-0.5wt%, expanding material 4.5-5.6wt%, UV light absorber 0.3-0.5wt%, static inhibitor 0.3-0.5wt%, each Ingredient percent sum is 100wt%; Described PETG resin processing aid is the ADD2 type auxiliary agent of Yi Shi Man of the U.S..
2. the PHA for smart card according to claim 1 prints diaphragm, and it is characterized in that, described softening agent is hexanodioic acid propanediol polyester or sebacic acid propanediol polyester.
3. the PHA for smart card according to claim 1 prints diaphragm, and it is characterized in that, described lubricant is ethylene bis stearamide or oleylamide.
4. the PHA for smart card according to claim 1 prints diaphragm, and it is characterized in that, described oxidation inhibitor is irgasfos 168 or antioxidant 264.
5. the PHA for smart card according to claim 1 prints diaphragm, and it is characterized in that, described expanding material is the SAG005 of Rizhisheng New Technology Development Co., Ltd., Shanghai.
6. the PHA for smart card according to claim 1 prints diaphragm, and it is characterized in that, described UV light absorber is salicylic acid phenyl ester or Octabenzone.
7. the PHA for smart card according to claim 1 prints diaphragm, and it is characterized in that, described static inhibitor is polyoxyethylene alkyl amine.
8. print the preparation method of diaphragm based on the PHA for smart card according to claim 1, it is characterized in that, comprise the following steps:
(1) take raw material to mix, wherein, PHA resin, PETG resin-oatmeal are dry after being broken to 70-80 order;
(2) high-speed stirring after heating and melting, whipping temp is 85-95 DEG C, high-speed stirring is in three stages: the first stage is 800-900 rev/min, churning time is 5-8 minute, subordinate phase is 1600-1800 rev/min, churning time is 3-4 minute, and the phase III is 800-900 rev/min, and churning time is 3-5 minute;
(3) stirring at low speed, whipping temp is 40-50 DEG C, and stirring velocity is 60-80 rev/min, and churning time is 15-20 minute;
(4) planet degassing extruder is plasticated: temperature controls at 110-165 DEG C, wherein one-level 110-140 DEG C, secondary 135-165 DEG C; Screw speed is 25-45rpm; Vacuum station rate of air sucked in required is 60m
3/ h, vacuum tightness is 60mbar, and negative pressure is 0.1bar;
(5) five roller rolling out films: roller speed 5-25m/ minute, speed ratio is 1.15-1.25, and stack temperature is respectively: No. 1 roller 110-140 DEG C, No. 2 roller 110-140 DEG C, No. 3 roller 120-160 DEG C, No. 4 roller 140-175 DEG C, No. 5 roller 145-160 DEG C;
(6) stretching is deflected from: doff roll temperature is: first group of 120-130 DEG C, second group of 115-125 DEG C, the 3rd group of 105-115 DEG C, the 4th group of 90-100 DEG C, the 5th group of 70-80 DEG C;
(7) cool: cooling temperature is: first group of 60-70 DEG C, second group of 50-60 DEG C, the 3rd group of 40-50 DEG C; Circulating water;
(8) draw, batch;
(9) photograph detects, automatic sorting or mark;
(10) cut: squareness dip deviation≤1.2mm/m.
9. the PHA for smart card according to claim 8 prints the preparation method of diaphragm, it is characterized in that, the thickness of printing diaphragm is 120 μm ± 5 μm.
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| CN108299807A (en) * | 2018-02-12 | 2018-07-20 | 东莞市京圣塑胶有限公司 | Band matt PET material |
| CN112757730B (en) * | 2021-02-05 | 2023-06-23 | 河南银金达新材料股份有限公司 | PETG multilayer composite film for packaging and preparation method thereof |
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| CN102153846A (en) * | 2011-05-29 | 2011-08-17 | 江苏华信塑业发展有限公司 | PHA (Polyhydroxyalkanoate) and PETG (Glycol-Polyethylene Terephathalate) blend rigid sheet and preparation method thereof |
| CN102250453A (en) * | 2011-05-29 | 2011-11-23 | 江苏华信塑业发展有限公司 | Polyhydroxyalkanoate (PHA) and poly(ethylene terephthalate)glycol (PETG) blend film and preparation method thereof |
| CN103483785A (en) * | 2013-09-29 | 2014-01-01 | 太仓市鸿运包装材料有限公司 | PETG (polyethylene terephthalate glycol) heat shrinking film and preparation method thereof |
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| US20040180162A1 (en) * | 2003-03-14 | 2004-09-16 | Gringoire Bruno R.L. | Reduced blocking metallized film |
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| CN102153846A (en) * | 2011-05-29 | 2011-08-17 | 江苏华信塑业发展有限公司 | PHA (Polyhydroxyalkanoate) and PETG (Glycol-Polyethylene Terephathalate) blend rigid sheet and preparation method thereof |
| CN102250453A (en) * | 2011-05-29 | 2011-11-23 | 江苏华信塑业发展有限公司 | Polyhydroxyalkanoate (PHA) and poly(ethylene terephthalate)glycol (PETG) blend film and preparation method thereof |
| CN103483785A (en) * | 2013-09-29 | 2014-01-01 | 太仓市鸿运包装材料有限公司 | PETG (polyethylene terephthalate glycol) heat shrinking film and preparation method thereof |
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| Title |
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| "作为智能卡基材PHA的工艺及可靠性研究";贺欢等;《中国优秀硕士学位论文全文数据库 工程科技I辑》;20140715(第7期);第1-51页 * |
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