CN113956520A - Method for manufacturing biodegradable cast film paper - Google Patents
Method for manufacturing biodegradable cast film paper Download PDFInfo
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- CN113956520A CN113956520A CN202111496785.2A CN202111496785A CN113956520A CN 113956520 A CN113956520 A CN 113956520A CN 202111496785 A CN202111496785 A CN 202111496785A CN 113956520 A CN113956520 A CN 113956520A
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- 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
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- 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
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- 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
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
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- 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
- C08J2471/00—Characterised by the use of polyethers obtained by reactions forming an ether link in the main chain; Derivatives of such polymers
- C08J2471/02—Polyalkylene oxides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/11—Esters; Ether-esters of acyclic polycarboxylic acids
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Biological Depolymerization Polymers (AREA)
Abstract
The invention discloses a method for manufacturing biodegradable cast film paper, which comprises the following steps: weighing 60-70 parts of poly (terephthalic acid) -butanediol adipate, 30-40 parts of polylactic acid, 10-15 parts of polyethylene glycol, 2-4 parts of citrate, 5-8 parts of nano fiber, 2-4 parts of silicon dioxide and 2-4 parts of silicone slipping agent according to the following weight parts, wherein the molecular weight of the silicone slipping agent is between 90 and 110 ten thousand; mixing the raw materials, mixing and extruding the mixture by a double-screw extruder, and granulating the extruded material to obtain plastic granules; preparing plastic particles into a film by adopting a tape casting method; and (3) performing unidirectional stretching on the film, and stretching and shaping to obtain a finished product. The invention adopts the manufacturing method of the biodegradable casting film paper, solves the problem that the casting film can not be degraded, has better water vapor permeability, reduces the cost and has simple preparation method.
Description
Technical Field
The invention relates to the technical field of cast film preparation, in particular to a method for manufacturing biodegradable cast film paper.
Background
Since birth, the material can be quickly used as a medium-current grinding column of packaging materials due to its advantages of light weight and easy forming. The plastic film with the largest share ratio in the plastic packaging industry is outstanding in packaging films due to the advantages of high production speed, high yield, good transparency, good gloss, good thickness uniformity and the like of cast films compared with blown films. The production of the cast film in China starts late, the foundation is weak, but the development speed is high. Through the continuous development and growth of the cast film for 20 years, the cast film in China at present becomes a sunrise industry with considerable production capacity and production level in the packaging industry. Compared with the blown film, the cast film has the advantages of high production speed, high yield, good transparency, good glossiness and good thickness uniformity, and meanwhile, because the subsequent processes of extruding the film, such as printing, compounding and the like are very convenient, the cast film is widely applied to the packaging of foods, medical supplies, textiles, flowers and daily necessities, the use amount is huge, the cast film cannot be recycled, and the pollution problem is gradually highlighted.
Most of the traditional plastics have stable performance, and are not easy to degrade rapidly under the action of various environmental factors in nature, so that the waste plastics have serious harm to the environment, namely, white pollution. Accordingly, biodegradable plastics have been developed, which can be digested and decomposed into carbon dioxide, water, other biomass and inorganic substances in a short time by microorganisms, and are environmentally low-load materials. PBAT is a biodegradable film material with the best comprehensive performance at present, but has the problems of high price and small global productivity. Polyvinyl alcohol (PVA) is also a film forming raw material with good biodegradability, but due to the hydrogen bond action of the molecular structure, the melting point is close to the decomposition temperature, the PVA film cannot be formed by thermoplastic molding, the PVA film can only be formed by water solution casting, and the PVA film forming method has low speed, high energy consumption and high cost.
In view of the above, it is desirable to design a method of making biodegradable cast film paper.
Disclosure of Invention
The invention aims to provide a method for manufacturing biodegradable casting film paper, which solves the problem that a casting film cannot be degraded, has good water vapor permeability, reduces the cost and is simple in preparation method.
In order to realize the aim, the invention provides a method for manufacturing biodegradable casting film paper, which comprises the following steps:
(1) preparing raw materials: weighing 60-70 parts of poly (terephthalic acid) -butanediol adipate, 30-40 parts of polylactic acid, 10-15 parts of polyethylene glycol, 2-4 parts of citrate, 5-8 parts of nano fiber, 2-4 parts of silicon dioxide and 2-4 parts of silicone slipping agent according to the following weight parts, wherein the molecular weight of the silicone slipping agent is between 90 and 110 ten thousand;
(2) preparing plastic particles: mixing poly (terephthalic acid) -butanediol adipate, polylactic acid, polyethylene glycol, citrate, nano fiber, silicon dioxide and silicone slipping agent, mixing and extruding through a double-screw extruder, and granulating the extruded material to obtain plastic granules;
(3) preparing a film: preparing plastic particles into a film by adopting a tape casting method;
(4) stretching and shaping: and (3) performing unidirectional stretching on the film, wherein the stretching temperature is 60-90 ℃, the stretching ratio is 1.2-2.5, the stretching speed is 90-100mm/min, and the finished product is obtained after stretching and shaping.
Preferably, the mixing and extruding rotation speed in the step (2) is 400-600rpm, and the heating temperature is 180-200 ℃.
Preferably, the film-forming temperature in the step (3) is 160-180 ℃, the die head temperature is 170-180 ℃, and the roll temperatures of the casting roll and the rubber roll are 10-50 ℃.
Preferably, the stretch-forming time in the step (4) is 20-30 min.
Preferably, the raw materials comprise 65 parts of polybutylene terephthalate-adipate, 40 parts of polylactic acid, 10 parts of polyethylene glycol, 3 parts of citrate, 4 parts of nano-fiber, 3 parts of silicon dioxide and 3 parts of silicone slipping agent, and the molecular weight of the silicone slipping agent is between 100 ten thousand.
Preferably, the polylactic acid has a number average molecular weight of 10 to 20 ten thousand.
Preferably, the polyethylene glycol has a number average molecular weight of 10000-.
Preferably, the polylactic acid is polymerized from D-lactic acid and L-lactic acid, and the mass ratio of the D-lactic acid to the L-lactic acid is 80: 20.
Preferably, the mesh number of the silicon dioxide is 1000-6000 meshes.
Polylactic acid incompatible with the polybutylene terephthalate-adipate is introduced, and the microporous structure on the film is realized by utilizing the principle that the polylactic acid is incompatible with the polybutylene terephthalate-adipate-butanediol, so that the water vapor permeability of the film is improved. Silica is introduced into the polybutylene terephthalate-adipate, and a plurality of microporous structures are generated on the film by utilizing the dispersion of silica filler, so that the water vapor permeability of the film is improved.
Polyethylene glycol is a plasticizer, the brittleness of polylactic acid can be improved, the polyethylene glycol can be diluted by adding the polyethylene glycol, the acting force among polymer chains is reduced, the forming and processing performance of the material is improved, and the breaking elongation and the impact strength are improved. In the process of melt blending of polyethylene glycol and polylactic acid, the alcoholic hydroxyl of the polyethylene glycol and the carboxyl of the polylactic acid are subjected to condensation reaction, and the polyethylene glycol is bonded to the polylactic acid molecular chain, so that the migration of the plasticizer can be reduced; by adding the nano-fiber, the nano-fiber has the characteristics of light weight, high crystallinity, high strength, good biodegradability and biocompatibility and the like, and can effectively improve the mechanical property of the membrane. The silicone slipping agent is used for reducing the friction coefficient of the heat seal layer, so that smooth film running during automatic packaging can be ensured, the molecular weight of the silicone slipping agent is between 90 and 110 ten thousand, and the silicone slipping agent has the characteristics of low mobility, no rise of the heat sealing temperature of the film, ultralow heat sealing temperature, low friction coefficient and stable performance. The citrate is used for improving the brittleness of the polylactic acid, can obviously overcome the brittle fracture of PLA and has better effect.
Therefore, the manufacturing method of the biodegradable casting film paper solves the problem that the casting film cannot be degraded, has good water vapor permeability, reduces the cost and is simple in preparation method.
The technical solution of the present invention is further described in detail by the following examples.
Detailed Description
The invention provides a method for manufacturing biodegradable cast film paper, which comprises the following steps:
(1) preparing raw materials: weighing 60-70 parts of poly (terephthalic acid) -butanediol adipate, 30-40 parts of polylactic acid, 10-15 parts of polyethylene glycol, 2-4 parts of citrate, 5-8 parts of nano fiber, 2-4 parts of silicon dioxide and 2-4 parts of silicone slipping agent according to the following weight parts, wherein the molecular weight of the silicone slipping agent is between 90 and 110 ten thousand;
(2) preparing plastic particles: mixing poly (terephthalic acid) -butanediol adipate, polylactic acid, polyethylene glycol, citric acid ester, nano fiber, silicon dioxide and a silicone slipping agent, and performing mixing extrusion by a double-screw extruder at the mixing extrusion rotating speed of 400 plus materials of 600rpm and the heating temperature of 180 plus materials of 200 ℃ to granulate the extruded materials to prepare plastic particles;
(3) preparing a film: preparing plastic particles into a film by adopting a flow casting method, wherein the film preparation temperature is 160-180 ℃, the die head temperature is 170-180 ℃, and the temperature of a flow casting roller and a rubber roller is 10-50 ℃;
(4) stretching and shaping: and (3) performing unidirectional stretching on the film, wherein the stretching temperature is 60-90 ℃, the stretching ratio is 1.2-2.5, the stretching speed is 90-100mm/min, and the finished product is obtained after stretching and shaping, and the stretching and shaping time is 20-30 min.
Further, the number average molecular weight of the polylactic acid is 10-20 ten thousand, the number average molecular weight of the polyethylene glycol is 10000-20000, the polylactic acid is polymerized by D-lactic acid and L-lactic acid, the mass ratio of the D-lactic acid to the L-lactic acid is 80:20, and the mesh number of the silicon dioxide is 1000-6000 meshes.
The technical solution of the present invention is further illustrated by the following examples.
Examples
The invention provides a method for manufacturing biodegradable cast film paper, which comprises the following steps:
(1) preparing raw materials: weighing 65 parts of poly (terephthalic acid) -butanediol adipate, 40 parts of polylactic acid, 10 parts of polyethylene glycol, 3 parts of citrate, 4 parts of nano-fiber, 3 parts of silicon dioxide and 3 parts of silicone slipping agent according to the following weight parts, wherein the molecular weight of the silicone slipping agent is between 100 ten thousand;
(2) preparing plastic particles: mixing poly (terephthalic acid) -butanediol adipate, polylactic acid, polyethylene glycol, citrate, nano fibers, silicon dioxide and a silicone slipping agent, and performing mixing extrusion by a double-screw extruder at the mixing extrusion rotating speed of 450rpm and the heating temperature of 200 ℃ to granulate the extruded material to prepare plastic particles;
(3) preparing a film: preparing plastic particles into a film by adopting a tape casting method, wherein the film preparation temperature is 170 ℃, the die head temperature is 175 ℃, and the temperature of a tape casting roller and a rubber roller is 30 ℃;
(4) stretching and shaping: and (3) performing unidirectional stretching on the film, wherein the stretching temperature is 70 ℃, the stretching ratio is 2.0, the stretching speed is 100mm/min, and the finished product is obtained after stretching and setting, and the stretching and setting time is 25 min.
After polylactic acid and silicon dioxide are introduced into the poly (terephthalic acid-adipic acid-butylene glycol ester), the water vapor permeability of the casting film is improved by 60 times compared with that of PE, and is improved by 4 times compared with that of the poly (terephthalic acid-adipic acid-butylene glycol ester), and the mechanical property of the casting film is optimized and improved at the same time.
Therefore, the manufacturing method of the biodegradable casting film paper solves the problem that the casting film cannot be degraded, has good water vapor permeability, reduces the cost and is simple in preparation method.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.
Claims (9)
1. A method for manufacturing biodegradable casting film paper is characterized by comprising the following steps:
(1) preparing raw materials: weighing 60-70 parts of poly (terephthalic acid) -butanediol adipate, 30-40 parts of polylactic acid, 10-15 parts of polyethylene glycol, 2-4 parts of citrate, 5-8 parts of nano fiber, 2-4 parts of silicon dioxide and 2-4 parts of silicone slipping agent according to the following weight parts, wherein the molecular weight of the silicone slipping agent is between 90 and 110 ten thousand;
(2) preparing plastic particles: mixing poly (terephthalic acid) -butanediol adipate, polylactic acid, polyethylene glycol, citrate, nano fiber, silicon dioxide and silicone slipping agent, mixing and extruding through a double-screw extruder, and granulating the extruded material to obtain plastic granules;
(3) preparing a film: preparing plastic particles into a film by adopting a tape casting method;
(4) stretching and shaping: and (3) performing unidirectional stretching on the film, wherein the stretching temperature is 60-90 ℃, the stretching ratio is 1.2-2.5, the stretching speed is 90-100mm/min, and the finished product is obtained after stretching and shaping.
2. A method of making biodegradable cast film paper as claimed in claim 1, characterized by: the mixing and extrusion rotating speed in the step (2) is 400-600rpm, and the heating temperature is 180-200 ℃.
3. A method of making biodegradable cast film paper as claimed in claim 1, characterized by: the film preparation temperature in the step (3) is 160-180 ℃, the die head temperature is 170-180 ℃, and the temperatures of the casting roller and the rubber roller are 10-50 ℃.
4. A method of making biodegradable cast film paper as claimed in claim 1, characterized by: and (4) the stretching and shaping time in the step (4) is 20-30 min.
5. A method of making biodegradable cast film paper as claimed in claim 1, characterized by: the raw materials comprise 65 parts of poly (terephthalic acid) -butanediol adipate, 40 parts of polylactic acid, 10 parts of polyethylene glycol, 3 parts of citrate, 4 parts of nano-fiber, 3 parts of silicon dioxide and 3 parts of silicone slipping agent, wherein the molecular weight of the silicone slipping agent is between 100 ten thousand.
6. A method of making biodegradable cast film paper as claimed in claim 1, characterized by: the number average molecular weight of the polylactic acid is 10-20 ten thousand.
7. A method of making biodegradable cast film paper as claimed in claim 1, characterized by: the polyethylene glycol has a number average molecular weight of 10000-.
8. A method of making biodegradable cast film paper as claimed in claim 1, characterized by: the polylactic acid is formed by polymerizing D-lactic acid and L-lactic acid, and the mass ratio of the D-lactic acid to the L-lactic acid is 80: 20.
9. A method of making biodegradable cast film paper as claimed in claim 1, characterized by: the mesh number of the silicon dioxide is 1000-6000 meshes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111496785.2A CN113956520A (en) | 2021-12-09 | 2021-12-09 | Method for manufacturing biodegradable cast film paper |
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| CN202111496785.2A CN113956520A (en) | 2021-12-09 | 2021-12-09 | Method for manufacturing biodegradable cast film paper |
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| CN113956520A true CN113956520A (en) | 2022-01-21 |
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2021
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