CN114075342A - Preparation method of PET (polyethylene terephthalate) film and PET-based printing paper film - Google Patents
Preparation method of PET (polyethylene terephthalate) film and PET-based printing paper film Download PDFInfo
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- CN114075342A CN114075342A CN202010800501.3A CN202010800501A CN114075342A CN 114075342 A CN114075342 A CN 114075342A CN 202010800501 A CN202010800501 A CN 202010800501A CN 114075342 A CN114075342 A CN 114075342A
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- 229920000139 polyethylene terephthalate Polymers 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 239000005020 polyethylene terephthalate Substances 0.000 title description 32
- -1 polyethylene terephthalate Polymers 0.000 title description 2
- 229920002799 BoPET Polymers 0.000 claims abstract description 45
- 229920001634 Copolyester Polymers 0.000 claims abstract description 25
- 238000005886 esterification reaction Methods 0.000 claims abstract description 17
- 229920006150 hyperbranched polyester Polymers 0.000 claims abstract description 16
- 238000007731 hot pressing Methods 0.000 claims abstract description 12
- 230000032050 esterification Effects 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000006068 polycondensation reaction Methods 0.000 claims abstract description 5
- 150000007519 polyprotic acids Polymers 0.000 claims abstract description 5
- WSXIMVDZMNWNRF-UHFFFAOYSA-N antimony;ethane-1,2-diol Chemical compound [Sb].OCCO WSXIMVDZMNWNRF-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000001125 extrusion Methods 0.000 claims abstract description 4
- 238000009998 heat setting Methods 0.000 claims abstract description 4
- 238000006555 catalytic reaction Methods 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims abstract description 3
- 150000005846 sugar alcohols Polymers 0.000 claims abstract description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 17
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims description 16
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 claims description 16
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims description 11
- 235000011037 adipic acid Nutrition 0.000 claims description 8
- 239000001361 adipic acid Substances 0.000 claims description 8
- 239000007888 film coating Substances 0.000 claims description 6
- 238000009501 film coating Methods 0.000 claims description 6
- YIMQCDZDWXUDCA-UHFFFAOYSA-N [4-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1CCC(CO)CC1 YIMQCDZDWXUDCA-UHFFFAOYSA-N 0.000 claims description 5
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 2
- 229920005862 polyol Polymers 0.000 claims description 2
- 150000003077 polyols Chemical class 0.000 claims description 2
- 239000013039 cover film Substances 0.000 claims 1
- 210000002489 tectorial membrane Anatomy 0.000 claims 1
- 239000000853 adhesive Substances 0.000 abstract description 6
- 230000001070 adhesive effect Effects 0.000 abstract description 6
- 238000000576 coating method Methods 0.000 abstract description 5
- 230000004888 barrier function Effects 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000005266 casting Methods 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 229920002488 Hemicellulose Polymers 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0027—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or layers by lamination or by fusion of the coatings or layers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/183—Terephthalic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/752—Corrosion inhibitor
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
Abstract
The invention discloses a preparation method of a PET film and a PET-based printing paper film, wherein the preparation method comprises the steps of mixing polybasic acid and polyhydric alcohol, carrying out esterification reaction under the catalysis of ethylene glycol antimony, adding hyperbranched polyester to carry out polycondensation reaction after the esterification to obtain PET copolyester, and then carrying out melt extrusion, longitudinal stretching, transverse stretching, heat setting, slitting and rolling to obtain the PET film; the printing paper coating is made by hot-pressing a PET film on the surface of printing paper through a coating process. The invention has the advantages that under the condition of not using an adhesive, the stripping force of the PET paper-covered film reaches 3.0-5.5N/25mm, the requirement of the paper-covered film field on the film bonding fastness is met, simultaneously, the barrier property of the paper-covered film is improved, the production cost is reduced, and the invention is safe and environment-friendly.
Description
Technical Field
The invention relates to an environment-friendly printing paper film and a preparation method thereof, in particular to a preparation method of a PET film and a PET-based printing paper film.
Background
The film covering of the paper printed matter refers to that the paper is printed and then is bonded with a plastic film coated with an adhesive through the pressurization of a rubber roller and an electric heating roller to form a paper-plastic integrated product. After the paper printed matter is coated with the film, a layer of thin and transparent plastic film is additionally arranged on the surface of the paper printed matter, so that the surface of the printed matter is smoother and brighter, the glossiness and the fastness of the printed matter are greatly improved, the service life of the product is prolonged, and the protective effects of water resistance, pollution resistance, wear resistance, folding resistance, chemical corrosion resistance and the like are achieved.
At present, plastic films commonly used in the film covering process are basically PP films, on one hand, the barrier property of the PP films is poor, and on the other hand, the PP films can be bonded to paper only by means of an adhesive. The PET material has excellent barrier property compared with a PP material, but a pure PET film can be bonded with paper by using an adhesive, so that the PET copolyester film needs to be modified to be applied to a printing paper film.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a preparation method of a modified PET film with adhesiveness; the second purpose of the invention is to provide a printing paper covering film prepared by using the modified PET film.
The technical scheme is as follows: the preparation method of the PET film comprises the following steps:
(1) preparation of PET copolyester: mixing polybasic acid and polyhydric alcohol, carrying out esterification reaction under the catalysis of ethylene glycol antimony, and adding hyperbranched polyester to carry out polycondensation reaction after the esterification is finished to obtain PET copolyester with specified viscosity;
(2) preparing a PET film: and (2) carrying out melt extrusion, longitudinal stretching, transverse stretching, heat setting, slitting and rolling on the PET copolyester prepared in the step (1) to prepare the PET film.
The preferable hyperbranched polyester is HBPE-OH with hydroxyl as an end group, the addition amount of the HBPE-OH is 0.001-0.002 mol, and the more preferable structural general formula of the HBPE-OH is CH3CH2C-(R1)x-(CH2OH)yOr C [ CH ]2OCOC(CH3)-(R2)m-(CH2OH)w]4In the formula, R1is-CH2OCOPhCOOCH2C(CH2CH3) Recurring structural unit of (A), R2is-CH2OCOC(CH3) -repeating structural unit, x represents the number of repeating units, x =3 × (2)n-1), m represents the number of repeating units, m = n-1, y represents the number of end groups, y =3 × 2nW represents the number of terminal groups, w =2nN represents an algebra and n =1 or 2 or 3; as the main raw material of the paper is plant fiber, the main components of the paper are cellulose and hemicellulose, the cellulose and the hemicellulose structurally have a large amount of hydroxyl-OH, the HBPE-OH structurally has a large amount of hydroxyl-OH, and the bonding force between the PET film and the paper can be increased through hydrogen bonding among a large amount of hydroxyl-OH.
Preferably, the polybasic acid consists of terephthalic acid, isophthalic acid and adipic acid; wherein the molar ratio of terephthalic acid, isophthalic acid and adipic acid is 1: 0.2-0.3: 0.05 to 0.15; preferred polyols consist of ethylene glycol and 1, 4-cyclohexanedimethanol; wherein the molar ratio of the ethylene glycol to the 1, 4-cyclohexanedimethanol is 1.5: 0.03 to 0.05.
The invention also protects a printing paper coating which is prepared by hot-pressing the prepared PET film on the surface of the printing paper through a coating process; the pressure during hot pressing is 200 kg, the time is 2-3 seconds, and the temperature is 100-150 ℃.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the film prepared from the modified PET polyester is firmly adhered to the surface of printing paper by only a hot roller pressing mode without using an adhesive, so that the barrier property of a paper-covered film is improved, a gluing process is omitted, the production cost is reduced, and the film is safe and environment-friendly.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
(1) Preparation of PET copolyester: 1mol of terephthalic acid (PTA), 1.5mol of Ethylene Glycol (EG), 0.3mol of isophthalic acid (IPA), 0.15mol of Adipic Acid (AA) and 0.03mol of 1, 4-Cyclohexanedimethanol (CHDM) are put into a 150L batch polymerization reaction kettle, 180ppm of ethylene glycol antimony (calculated by Sb atom, relative to polyester PET) is added as a catalyst, the temperature is raised for esterification reaction, the esterification temperature is 255 ℃, the pressure is 0.2MPa, 0.002mol of hyperbranched polyester HBPE-OH is added after the esterification is finished, and the structural formula is CH3CH2C-(CH2OCOPhCOOCH2C(CH2CH3))21-(CH2OH)24And then continuously heating to carry out polycondensation reaction at the polycondensation temperature of 280 ℃ and the pressure of less than or equal to 60Pa, discharging after a certain time, granulating and drying to obtain PET copolyester chips, wherein the intrinsic viscosity of the obtained PET copolyester is 0.65-0.70dL/g, and the melting range is 100-120 ℃.
(2) Preparing a PET film: drying the prepared PET copolyester, performing melt extrusion by a screw extruder to obtain a melt, cooling the melt by a quenching roller at 50 ℃ at the screw temperature of 230 ℃ to obtain a casting piece, wherein the obtained PET casting piece has an ABC structure, the A, B layer is made of conventional PET polyester chips, the C layer is made of the prepared PET copolyester, and the C layer accounts for about 10-15%. The PET film for the printing paper is obtained after the casting sheet is preheated, stretched, heat-set and rolled, wherein the preheating process comprises the following steps: the temperature is 80 ℃ and the time is 10 s; the stretching process comprises the following steps: the temperature is 95 ℃, and bidirectional gradual stretching is carried out, namely longitudinal stretching is carried out firstly, then transverse stretching is carried out, the stretching multiplying power is 3.5 times in the longitudinal direction and 3.5 times in the transverse direction, and the stretching speed is 100%; a heat setting process: the temperature is 180 ℃ and the time is 2 s; the thickness of the resulting PET film was 10 μm.
(3) Printing paper film covering process: and (3) placing the prepared PET film on printing paper to enable the layer C to be in contact with the surface of the printing paper, then placing the PET film on a laminating machine for hot pressing, wherein the pressure is 200 kg, the temperature of a hot roller is 100 ℃, the time is 3s, and the stripping force of the PET film and the surface of the printing paper after the hot pressing is 5.5N/25 mm.
Example 2
The preparation process of the PET copolyester, the preparation process of the PET film and the film coating process of the printing paper are the same as those of the first embodiment, except that: when preparing PET copolyester, 0.2mol IPA, 0.1mol AA, 0.04mol CHDM are added before esterification, 0.001mol hyperbranched polyester HBPE-OH with the structural formula of CH is added after esterification3CH2C-(CH2OCOPhCOOCH2C(CH2CH3))9-(CH2OH)12The viscosity of the obtained PET copolyester is 0.60-0.65dL/g, and the melting range is 110-130 ℃; the stretching temperature in the preparation process of the PET film is 100 ℃, and the thickness of the obtained PET film is 12 mu m; the temperature of a hot roller in the film covering process of the printing paper is 110 ℃, and the peeling force of the PET film obtained after hot pressing and the surface of the printing paper is 4.5N/25 mm.
Example 3
The preparation process of the PET copolyester, the preparation process of the PET film and the film coating process of the printing paper are the same as those of the first embodiment, except that: when preparing PET copolyester, 0.3mol IPA, 0.05mol AA and 0.05mol CHDM are added before esterification, 0.002mol hyperbranched polyester HBPE-OH with a structural formula of CH is added after esterification3CH2C-(CH2OCOPhCOOCH2C(CH2CH3))3-(CH2OH)6The viscosity of the obtained PET copolyester is 0.60-0.65dL/g, and the melting range is 120-150 ℃; the stretching temperature in the preparation process of the PET film for the printing paper is 100 ℃, and the thickness of the obtained PET film is 15 mu m; the temperature of a hot roller in the film covering process of the printing paper is 115 ℃, and the peeling force between the PET film obtained after hot pressing and the surface of the printing paper is 4.0N/25 mm.
Example 4
Preparation of PET copolyester the preparation of PET film and the coating of printing paper are the same as in the examples, except that 0.001mol of hyperbranched polyester HBPE-OH is added after esterification, the structural formula of the hyperbranched polyester is C [ CH ]2OCOC(CH3)-(CH2OH)2]4The viscosity of the obtained PET copolyester is 0.60-0.65dL/g, and the melting range is 130-160 ℃; the temperature of a hot roller in the printing paper laminating process is 125 ℃, and the peeling force between the PET film obtained after hot pressing and the surface of the printing paper is 3.5N/25 mm.
Example 5
The preparation process of PET copolyester, the preparation process of PET film and the film coating process of printing paper are the same as those in the two embodiments, except that 0.002mol of hyperbranched polyester HBPE-OH is added after esterification, and the structural formula of the hyperbranched polyester is C [ CH ]2OCOC(CH3)CH2OCOC(CH3)-(CH2OH)4]4And the peeling force between the PET film obtained after the hot pressing and the surface of the printing paper is 4.0N/25 mm.
Example 6
The preparation process of PET copolyester, the preparation process of PET film and the film coating process of printing paper are the same as those in the first embodiment, except that 0.001mol of hyperbranched polyester HBPE-OH is added after esterification, and the structural formula of the hyperbranched polyester is C [ CH ]2OCOC(CH3)(CH2OCOC(CH3))2-(CH2OH)8]4And the peeling force between the PET film obtained after the hot pressing and the surface of the printing paper is 3.0N/25 mm.
Comparative example 1
The preparation process of PET copolyester, the preparation process of PET film and the film coating process of printing paper are the same as those in the first embodiment, except that hyperbranched polyester is not added after esterification, and the peeling force between the PET film obtained after hot-pressing and the surface of the printing paper is 0.5N/25 mm. Therefore, the PET film prepared from the hyperbranched polyester can still keep higher bonding capacity with paper under the condition of not using an adhesive, and the blocking performance of the coated film of the printing paper is improved while the gluing process is omitted.
Claims (9)
1. A preparation method of a PET film is characterized by comprising the following steps:
(1) preparation of PET copolyester: mixing polybasic acid and polyhydric alcohol, carrying out esterification reaction under the catalysis of ethylene glycol antimony, and adding hyperbranched polyester to carry out polycondensation reaction after the esterification is finished to obtain PET copolyester with specified viscosity;
(2) preparing a PET film: and (2) carrying out melt extrusion, longitudinal stretching, transverse stretching, heat setting, slitting and rolling on the PET copolyester prepared in the step (1) to prepare the PET film.
2. The method for producing a PET film according to claim 1, wherein: in the step (1), the hyperbranched polyester is HBPE-OH with an end group of hydroxyl, and the addition amount of the HBPE-OH is 0.001-0.002 mol.
3. The method for producing a PET film according to claim 2, characterized in that: the HBPE-OH has a structural general formula of CH3CH2C-(R1)x-(CH2OH)y(ii) a In the formula, R1is-CH2OCOPhCOOCH2C(CH2CH3) -repeating structural unit, x represents the number of repeating units, x =3 × (2)n-1), y represents the number of end groups, y =3 × 2nN represents algebraic and n =1 or 2 or 3.
4. The method for producing a PET film according to claim 2, characterized in that: the HBPE-OH has a structural general formula of C [ CH2OCOC(CH3)-(R2)m-(CH2OH)w]4(ii) a In the formula, R2is-CH2OCOC(CH3) -repeating structural unit of (a), m represents the number of repeating units, m = n-1, w represents the number of terminal groups, w =2nN represents algebraic and n =1 or 2 or 3.
5. The method for producing a PET film according to claim 1, wherein: in the step (1), the polyol consists of ethylene glycol and 1, 4-cyclohexanedimethanol; wherein the molar ratio of the ethylene glycol to the 1, 4-cyclohexanedimethanol is 1.5: 0.03 to 0.05.
6. The method for producing a PET film according to claim 1, wherein: in the step (1), the polybasic acid consists of terephthalic acid, isophthalic acid and adipic acid; wherein the molar ratio of terephthalic acid, isophthalic acid and adipic acid is 1: 0.2-0.3: 0.05 to 0.15.
7. The method for producing a PET film according to claim 1, wherein: in the step (1), the intrinsic viscosity of the PET copolyester is 0.60-0.70 dL/g, and the melting range is 100-160 ℃.
8. A printing paper tectorial membrane which characterized in that: the PET film prepared by the method of any one of claims 1 to 7 is thermally laminated on the surface of printing paper by a film-coating process.
9. The printing paper cover film according to claim 8, characterized in that: the pressure is 190-210 kg during hot pressing, the time is 2-3 s, and the temperature is 100-150 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010800501.3A CN114075342B (en) | 2020-08-11 | 2020-08-11 | Preparation method of PET film and PET-based printing paper coating film |
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| CN202010800501.3A CN114075342B (en) | 2020-08-11 | 2020-08-11 | Preparation method of PET film and PET-based printing paper coating film |
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| CN114075342A true CN114075342A (en) | 2022-02-22 |
| CN114075342B CN114075342B (en) | 2023-11-17 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10136911A1 (en) * | 2001-07-30 | 2003-02-20 | Buehler Ag | Process for preparation of a modified polyester of improved mechanical and rheological properties containing a hyperbranched polymer |
| US20040024087A1 (en) * | 2000-10-31 | 2004-02-05 | Bernd Bruchmann | Liquid printing inks for flexographic and/or intaglio printing comprising hyperbranched polymers as the vehicle |
| US20080064827A1 (en) * | 2004-07-19 | 2008-03-13 | Basf Aktiengesellschaft | Mixtures of Hyperbranched Polyesters with Polycarbonates as Additive for Polyester Molding Compositions |
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