CN111205441A - Preparation process of high-shrinkage high-heat-seal-viscosity polyester product for packaging - Google Patents
Preparation process of high-shrinkage high-heat-seal-viscosity polyester product for packaging Download PDFInfo
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- CN111205441A CN111205441A CN201911394532.7A CN201911394532A CN111205441A CN 111205441 A CN111205441 A CN 111205441A CN 201911394532 A CN201911394532 A CN 201911394532A CN 111205441 A CN111205441 A CN 111205441A
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- 229920000728 polyester Polymers 0.000 title claims abstract description 50
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000000047 product Substances 0.000 claims abstract description 72
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 51
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000006068 polycondensation reaction Methods 0.000 claims abstract description 41
- YIMQCDZDWXUDCA-UHFFFAOYSA-N [4-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1CCC(CO)CC1 YIMQCDZDWXUDCA-UHFFFAOYSA-N 0.000 claims abstract description 23
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000376 reactant Substances 0.000 claims abstract description 18
- 239000006227 byproduct Substances 0.000 claims abstract description 15
- 239000000654 additive Substances 0.000 claims abstract description 14
- 239000003054 catalyst Substances 0.000 claims abstract description 14
- 238000004537 pulping Methods 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 9
- 230000000996 additive effect Effects 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 6
- 229920001634 Copolyester Polymers 0.000 claims abstract description 3
- 238000005886 esterification reaction Methods 0.000 claims description 35
- 230000032050 esterification Effects 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 239000003963 antioxidant agent Substances 0.000 claims description 8
- 230000003078 antioxidant effect Effects 0.000 claims description 8
- 239000012760 heat stabilizer Substances 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 6
- -1 neopentyl glycol ester Chemical class 0.000 claims description 4
- 150000002009 diols Chemical class 0.000 claims description 2
- 239000003607 modifier Substances 0.000 claims description 2
- 239000004014 plasticizer Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 239000000326 ultraviolet stabilizing agent Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- QEZIKGQWAWNWIR-UHFFFAOYSA-N antimony(3+) antimony(5+) oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[Sb+3].[Sb+5] QEZIKGQWAWNWIR-UHFFFAOYSA-N 0.000 description 6
- WSXIMVDZMNWNRF-UHFFFAOYSA-N antimony;ethane-1,2-diol Chemical compound [Sb].OCCO WSXIMVDZMNWNRF-UHFFFAOYSA-N 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 229920005644 polyethylene terephthalate glycol copolymer Polymers 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000012785 packaging film Substances 0.000 description 3
- 229920006280 packaging film Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000005022 packaging material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Classifications
-
- 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
- C08G63/199—Acids or hydroxy compounds containing cycloaliphatic rings
-
- 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
- C08G63/82—Preparation processes characterised by the catalyst used
- C08G63/85—Germanium, tin, lead, arsenic, antimony, bismuth, titanium, zirconium, hafnium, vanadium, niobium, tantalum, or compounds thereof
- C08G63/86—Germanium, antimony, or compounds thereof
- C08G63/866—Antimony or compounds thereof
Abstract
The invention provides a preparation process of a high-shrinkage high-heat-seal-viscosity polyester product for packaging, which mainly comprises the following steps: (a) adding purified terephthalic acid, ethylene glycol, neopentyl glycol, a catalyst and an additive into a reactor A, pulping and stirring, esterifying reactants at a certain temperature and under a certain pressure, and removing byproducts; (b) adding purified terephthalic acid, ethylene glycol, 1, 4-cyclohexanedimethanol, a catalyst and an additive into a reactor B, pulping and stirring, esterifying reactants at temperature and pressure, and removing byproducts; (c) mixing the esterified substances in the reactors A and B, transferring the mixture into a reactor C, and performing pre-polycondensation under the conditions of temperature and low vacuum; (d) transferring the reactants in the reactor C to a reactor D to further polycondense the reactants into copolyester under the conditions of temperature and high vacuum; (e) and (3) granulating, drying and packaging the polyester product cast strip after polymerization. The invention has reasonable process, less impurities in the finished product and stable product quality.
Description
Technical Field
The invention relates to preparation of polyester products, in particular to a preparation process of a polyester product with high shrinkage and high heat-seal viscosity for packaging.
Background
The polyester packaging material is the most active and promising material in various packaging materials, and is also the fastest-developing field in a plurality of application fields of polyester. PETG is a polyester product with the greatest application in the field of packaging at present, is developed by Eastman company in the last 80 century, has excellent impact resistance, high transparency, high fluidity and easy coloring, has wider thermal formability and good sanitation, does not release toxic gas during incineration, does not pollute underground water sources after landfill treatment, and is an environment-friendly plastic product for packaging. However, PETG produced from expensive 1, 4-cyclohexanedimethanol is expensive, has a high melting point and insufficient thermal adhesiveness, and thus is always slightly insufficient as a packaging film.
Disclosure of Invention
The invention relates to a method for producing polyester products with high shrinkage and high heat-seal viscosity by modifying neopentyl glycol and 1, 4-cyclohexanedimethanol based on the defects of PETG in the aspect of using PETG for packaging films. On one hand, the price of the neopentyl glycol is lower than that of 1, 4-cyclohexanedimethanol, and the production cost of the packaging film can be reduced by jointly modifying the neopentyl glycol and the 1, 4-cyclohexanedimethanol; on the other hand, the addition of neopentyl glycol to partially replace 1, 4-cyclohexanedimethanol can also reduce the glass transition temperature and the melting point of PETG, thereby being beneficial to energy conservation; finally, the neopentyl glycol and the 1, 4-cyclohexanedimethanol are jointly modified, so that the excellent thermal adhesion property of the neopentyl glycol during independent modification can be maintained, and the thermal stability of the neopentyl glycol is improved, so that the neopentyl glycol is convenient to store and transport.
The invention relates to a preparation process of a modified high-shrinkage high-heat-seal-viscosity polyester product, which is characterized in that a reactor A is used for esterifying purified terephthalic acid, ethylene glycol and neopentyl glycol, a reactor B is used for esterifying purified terephthalic acid, ethylene glycol and 1, 4-cyclohexanedimethanol, and then the esterification products of the reactor A and the reactor B are subjected to pre-polycondensation, polycondensation and other reactions in a C, D reactor to produce the high-shrinkage high-heat-seal-viscosity polyester product; the esterification reaction process of PTA and neopentyl glycol (or 1, 4-cyclohexanedimethanol) can be controlled easily by separate esterification, and the polycondensation process is not easily affected seriously by side reaction products by separate implementation of the pre-polycondensation and the polycondensation process, so that the impurities of the finished product are less, and the quality can be ensured.
The invention provides a preparation process of a modified high-shrinkage high-heat-seal viscosity polyester product, which comprises the following steps:
(a) adding purified terephthalic acid, ethylene glycol, neopentyl glycol, a catalyst and an additive into a reactor A, pulping and stirring, esterifying reactants at a certain temperature and under a certain pressure, and removing a byproduct;
(b) adding purified terephthalic acid, ethylene glycol, 1, 4-cyclohexanedimethanol, a catalyst and an additive into a reactor B, pulping and stirring, esterifying reactants at a certain temperature and under a certain pressure, and removing byproducts;
(c) mixing the esterified substances in the reactors A and B, transferring the mixture into a reactor C, and performing pre-polycondensation at a certain temperature under a low vacuum condition;
(d) transferring the reactant in the reactor C to a reactor D, and further polycondensing the reactant into copolyester under certain temperature and high vacuum conditions;
(e) and (3) granulating, drying and packaging the polyester product cast strip after polymerization.
In the above method for preparing a modified high shrinkage, high heat seal tack polyester product, the modifier is neopentyl glycol and 1, 4-cyclohexanedimethanol.
In the above method for preparing modified polyester products with high shrinkage and high heat-seal viscosity, the esterification process is a process of esterifying neopentyl glycol, 1, 4-cyclohexanedimethanol and terephthalic acid separately.
In the method for preparing the modified high-shrinkage high-heat-seal-viscosity polyester product, the polycondensation process is divided into pre-polycondensation and polycondensation which are carried out in two steps.
In the above method for preparing modified high shrinkage, high heat-seal viscosity polyester product, the polycondensation process is (terephthalic acid, neopentyl glycol ester) and (terephthalic acid, 1, 4-cyclohexane dimethanol ester).
In the above method for preparing modified high shrinkage, high heat-seal viscosity polyester product, the catalyst is one or more of Ti (IV) oxide, Ge (IV) oxide, Sb (III) salt, Ge (IV) salt and Ti (IV) salt;
in the method for preparing the modified high-shrinkage high-heat-seal-viscosity polyester product, the additive is one or more of an antioxidant, a heat stabilizer, an ultraviolet stabilizer or a plasticizer.
In the method for preparing the modified high-shrinkage high-heat-seal viscosity polyester product, the molar ratio of the diol to the purified terephthalic acid in the raw materials for the esterification reaction is (1.0-1.5) to 1, wherein the molar ratio of the neopentyl glycol (or 1, 4-cyclohexanedimethanol) to the ethylene glycol is 1 to (1-5).
In the method for preparing the modified high-shrinkage high-heat-seal viscosity polyester product, the esterification temperature is 230-250 ℃, and the esterification pressure is normal pressure.
In the method for preparing the modified high-shrinkage high-heat-seal-viscosity polyester product, the pre-polycondensation temperature is 250-260 ℃, the absolute pressure is 0.3-20Kpa, and the time is 0.3-2 hours.
In the method for preparing the modified high-shrinkage high-heat-seal viscous polyester product, the polycondensation temperature is 250-270 ℃, and the absolute pressure is 0-300 Pa.
In the above method for preparing modified high shrinkage, high heat-seal viscosity polyester product, the pre-polycondensation and the polycondensation can be carried out in one reaction kettle or separately.
The invention has reasonable process, less impurities in the produced finished product and more stable quality of the product.
Detailed Description
Example 1
(1) Adding 3.0kg of purified terephthalic acid, 0.7kg of ethylene glycol, 1.1kg of neopentyl glycol, a proper amount of catalyst (antimony dioxide or ethylene glycol antimony) and other additives (such as an antioxidant and a heat stabilizer) into a reactor A, pulping, uniformly stirring, esterifying reactants at the temperature of 235 ℃ and 250 ℃ (normal pressure), judging whether the esterification process is complete according to the amount of water which is a by-product of the esterification reaction, and collecting the esterified substance after the esterification reaction is finished;
(2) adding 3.0kg of purified terephthalic acid, 0.7kg of ethylene glycol, 0.65kg of 1, 4-cyclohexanedimethanol, a proper amount of catalyst (antimony dioxide or ethylene glycol antimony) and other additives (such as antioxidant and heat stabilizer) into a reactor B, pulping, uniformly stirring, esterifying reactants at the temperature of 235 ℃ and 250 ℃ (normal pressure), judging whether the esterification process is complete according to the amount of water which is a byproduct of the esterification reaction, and collecting an esterified substance after the esterification reaction is finished;
(3) mixing the esterification products generated by the reaction in the reactors A and B, transferring the mixture into a reactor C, and carrying out pre-polycondensation reaction 1H on the two esterification products at the temperature of 240-260 ℃ and the absolute pressure of 0.3-2 Kpa;
(4) transferring the pre-polycondensation product in the reactor C into a reactor D, carrying out polycondensation reaction at the temperature of 250-280 ℃ and the absolute pressure of 0-200Pa, and judging the polycondensation reaction process according to the material viscosity in the polycondensation reaction process and the production amount of the byproduct glycol;
(5) after the polycondensation process is finished, the polyester product after polymerization is subjected to belt casting, grain cutting, drying, packaging and detection, and the detection result shows that the heat shrinkage rate of the copolymerized product is improved by about 5% compared with that of the product obtained by singly using 1, 4-cyclohexanedimethanol to modify at the same temperature, and the heat sealing viscosity of the product is better.
Example 2
(1) 1.5kg of purified terephthalic acid, 0.35kg of ethylene glycol, 0.55kg of neopentyl glycol, a proper amount of catalyst (antimony dioxide or ethylene glycol antimony) and other additives (such as an antioxidant and a heat stabilizer) are added into a reactor A, the mixture is pulped and uniformly stirred, reactants are esterified at the temperature of 235 ℃ and 250 ℃ (normal pressure), whether the esterification process is complete is judged according to the amount of water which is a by-product of the esterification reaction, and the esterified substances are collected after the esterification reaction is finished;
(2) adding 3.0kg of purified terephthalic acid, 0.7kg of ethylene glycol, 0.65kg of 1, 4-cyclohexanedimethanol, a proper amount of catalyst (antimony dioxide or ethylene glycol antimony) and other additives (such as antioxidant and heat stabilizer) into a reactor B, pulping, uniformly stirring, esterifying reactants at the temperature of 235 ℃ and 250 ℃ (normal pressure), judging whether the esterification process is complete according to the amount of water which is a byproduct of the esterification reaction, and collecting an esterified substance after the esterification reaction is finished;
(3) mixing the esterification products generated by the reaction in the reactors A and B, transferring the mixture into a reactor C, and carrying out pre-polycondensation reaction 1H on the two esterification products at the temperature of 240-260 ℃ and the absolute pressure of 0.3-2 Kpa;
(4) transferring the pre-polycondensation product in the reactor C into a reactor D, carrying out polycondensation reaction at the temperature of 250-280 ℃ and the absolute pressure of 0-200Pa, and judging the polycondensation reaction process according to the material viscosity in the polycondensation reaction process and the production amount of the byproduct glycol;
(5) after the polycondensation process is finished, the polyester product after polymerization is subjected to belt casting, grain cutting, drying, packaging and detection, and the detection result shows that the heat shrinkage rate of the copolymerized product is improved by about 2% compared with that of the product obtained by singly using 1, 4-cyclohexanedimethanol to modify at the same temperature, and the heat sealing viscosity of the product is better.
Example 3
(1) Adding 3.0kg of purified terephthalic acid, 0.7kg of ethylene glycol, 1.1kg of neopentyl glycol, a proper amount of catalyst (antimony dioxide or ethylene glycol antimony) and other additives (such as an antioxidant and a heat stabilizer) into a reactor A, pulping, uniformly stirring, esterifying reactants at the temperature of 235 ℃ and 250 ℃ (normal pressure), judging whether the esterification process is complete according to the amount of water which is a by-product of the esterification reaction, and collecting the esterified substance after the esterification reaction is finished;
(2) adding 1.5kg of purified terephthalic acid, 0.4kg of ethylene glycol, 0.3kg of 1, 4-cyclohexanedimethanol, a proper amount of catalyst (antimony dioxide or ethylene glycol antimony) and other additives (such as antioxidant and heat stabilizer) into a reactor B, pulping, uniformly stirring, esterifying reactants at the temperature of 235 ℃ and 250 ℃ (normal pressure), judging whether the esterification process is complete according to the amount of water which is a byproduct of the esterification reaction, and collecting an esterified substance after the esterification reaction is finished;
(3) mixing the esterification products generated by the reaction in the reactors A and B, transferring the mixture into a reactor C, and carrying out pre-polycondensation reaction 1H on the two esterification products at the temperature of 240-260 ℃ and the absolute pressure of 0.3-2 Kpa;
(4) transferring the pre-polycondensation product in the reactor C into a reactor D, carrying out polycondensation reaction at the temperature of 250-280 ℃ and the absolute pressure of 0-200Pa, and judging the polycondensation reaction process according to the material viscosity in the polycondensation reaction process and the production amount of the byproduct glycol;
(5) after the polycondensation process is finished, the polyester product after polymerization is subjected to belt casting, grain cutting, drying, packaging and detection, and the detection result shows that the heat shrinkage rate of the copolymerized product is improved by about 3% compared with that of the product obtained by singly using 1, 4-cyclohexanedimethanol to modify at the same temperature, and the heat sealing viscosity of the product is better.
The above examples are merely illustrative for clarity and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. It is not necessary or necessary to exhaustively enumerate all embodiments herein, and obvious variations or modifications can be made without departing from the scope of the invention.
Claims (10)
1. A preparation process of a high-shrinkage high-heat-seal-viscosity polyester product for packaging is characterized by comprising the following steps of: the method comprises the following steps:
(a) adding purified terephthalic acid, ethylene glycol, neopentyl glycol, a catalyst and an additive into a reactor A, pulping and stirring, esterifying reactants at a certain temperature and under a certain pressure, and removing a byproduct;
(b) adding purified terephthalic acid, ethylene glycol, 1, 4-cyclohexanedimethanol, a catalyst and an additive into a reactor B, pulping and stirring, esterifying reactants at a certain temperature and under a certain pressure, and removing byproducts;
(c) mixing the esterified substances in the reactors A and B, transferring the mixture into a reactor C, and performing pre-polycondensation at a certain temperature under a low vacuum condition;
(d) transferring the reactant in the reactor C to a reactor D, and further polycondensing the reactant into copolyester under certain temperature and high vacuum conditions;
(e) and (3) granulating, drying and packaging the polyester product cast strip after polymerization.
2. The process for preparing a high shrinkage, high heat-seal tack polyester product for packaging according to claim 1, wherein: in the method for preparing the modified high-shrinkage high-heat-seal-viscosity polyester product, the modifier is neopentyl glycol and 1, 4-cyclohexanedimethanol.
3. The process for preparing a high shrinkage, high heat-seal tack polyester product for packaging according to claim 1, wherein: in the method for preparing the modified polyester product with high shrinkage and high heat-seal viscosity, the esterification process is the process of esterifying neopentyl glycol, 1, 4-cyclohexanedimethanol and terephthalic acid respectively and independently.
4. The process for preparing a high shrinkage, high heat-seal tack polyester product for packaging according to claim 1, wherein: in the method for preparing the modified high-shrinkage high-heat-seal-viscosity polyester product, the polycondensation process is divided into pre-polycondensation and polycondensation which are carried out in two steps.
5. The process for preparing a high shrinkage, high heat-seal tack polyester product for packaging according to claim 1, wherein: in the method for preparing the modified high-shrinkage high-heat-seal viscosity polyester product, the polycondensation process is the polycondensation process of terephthalic acid, neopentyl glycol ester, terephthalic acid and 1, 4-cyclohexanedimethanol ester.
6. The process for preparing a high shrinkage, high heat-seal tack polyester product for packaging according to claim 1, wherein: in the above method for preparing modified high shrinkage, high heat-seal viscosity polyester product, the catalyst is one or more of Ti (IV) oxide, Ge (IV) oxide, Sb (III) salt, Ge (IV) salt and Ti (IV) salt;
the process for preparing a high shrinkage, high heat-seal tack polyester product for packaging according to claim 1, wherein: in the method for preparing the modified high-shrinkage high-heat-seal-viscosity polyester product, the additive is one or more of an antioxidant, a heat stabilizer, an ultraviolet stabilizer or a plasticizer.
7. The process for preparing a high shrinkage, high heat-seal tack polyester product for packaging according to claim 1, wherein: in the method for preparing the modified high-shrinkage high-heat-seal viscosity polyester product, the molar ratio of the diol to the purified terephthalic acid in the raw materials for the esterification reaction is (1.0-1.5) to 1, wherein the molar ratio of the neopentyl glycol (or 1, 4-cyclohexanedimethanol) to the ethylene glycol is 1 to (1-5).
8. The process for preparing a high shrinkage, high heat-seal tack polyester product for packaging according to claim 1, wherein: in the method for preparing the modified high-shrinkage high-heat-seal viscosity polyester product, the esterification temperature is 230-250 ℃, and the esterification pressure is normal pressure.
9. The process for preparing a high shrinkage, high heat-seal tack polyester product for packaging according to claim 1, wherein: in the method for preparing the modified high-shrinkage high-heat-seal-viscosity polyester product, the pre-polycondensation temperature is 250-260 ℃, the absolute pressure is 0.3-20Kpa, and the time is 0.3-2 hours.
10. The process for preparing a high shrinkage, high heat-seal tack polyester product for packaging according to claim 1, wherein: in the method for preparing the modified high-shrinkage high-heat-seal viscous polyester product, the polycondensation temperature is 250-270 ℃, and the absolute pressure is 0-300 Pa.
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Cited By (1)
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| CN113004500A (en) * | 2021-03-08 | 2021-06-22 | 金华市兆亿塑业有限公司 | PETG material for manufacturing cosmetic bottle body or pipe body and preparation method thereof |
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| CN113004500A (en) * | 2021-03-08 | 2021-06-22 | 金华市兆亿塑业有限公司 | PETG material for manufacturing cosmetic bottle body or pipe body and preparation method thereof |
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