CN113185822A - PHA-based improved degradable plastic and production process thereof - Google Patents
PHA-based improved degradable plastic and production process thereof Download PDFInfo
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- CN113185822A CN113185822A CN202110567870.7A CN202110567870A CN113185822A CN 113185822 A CN113185822 A CN 113185822A CN 202110567870 A CN202110567870 A CN 202110567870A CN 113185822 A CN113185822 A CN 113185822A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic 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
- 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
- C08J2367/04—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
- C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2401/02—Cellulose; Modified cellulose
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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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Materials Engineering (AREA)
- Biological Depolymerization Polymers (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a PHA-based improved degradable plastic and a production process thereof, wherein the PHA-based improved degradable plastic comprises the following raw material components in parts by weight: 60-80 parts of 3-hydroxybutyrate-co-4-hydroxybutyrate, 25-40 parts of polylactic acid, 30-36 parts of cellulose and 5-12 parts of auxiliary agent; the auxiliary agent comprises the following components: one or more of light stabilizer, antioxidant, plasticizer, antiblocking agent and antistatic agent. The improved degradation plastic based on the PHA and the production process thereof have better interface adhesion by mutually fusing 60-80 parts of 3-hydroxybutyrate-co-4-hydroxybutyrate and cellulose, thereby improving the processing performance of the biological plastic, reducing the production cost thereof and meeting the market demand.
Description
Technical Field
The invention relates to the technical field of plastic production, in particular to PHA (polyhydroxyalkanoate) -based improved degradable plastic and a production process thereof.
Background
The polyhydroxyalkanoate is intracellular polyester synthesized by a plurality of bacteria, mainly exists as a storage substance of a carbon source and an energy source in organisms, has physical and chemical properties similar to those of synthetic plastics and a plurality of excellent properties such as biodegradability, biocompatibility, optical activity, piezoelectricity, gas separation property and the like which are not possessed by the synthetic plastics, has wide application prospect in biodegradable packaging materials, tissue engineering materials, slow release materials, electrical materials and medical materials, but can be applied on a large scale only after the production cost of PHA is reduced;
the traditional plastic film products based on PHA materials have high cost and are not widely used in the field all the time, and secondly, in the manufacturing and production processes of plastic films, the process difficulty is high, and the product quality and performance are still to be further improved, so that the PHA-based improved degradable plastic and the production process thereof are provided to at least solve the problems.
Disclosure of Invention
The invention aims to provide improved degradation plastic based on PHA and a production process thereof, so as to at least solve the problems of high manufacturing cost and high process difficulty in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a production process of PHA-based improved degradation plastic comprises the following raw material components in parts by weight:
60-80 parts of 3-hydroxybutyrate-co-4-hydroxybutyrate, 25-40 parts of polylactic acid, 30-36 parts of cellulose and 5-12 parts of auxiliary agent;
the auxiliary agent comprises the following components: one or more of light stabilizer, antioxidant, plasticizer, antiblocking agent and antistatic agent.
Preferably, the method comprises the following steps:
s1, drying and dehumidifying, namely premixing 3-hydroxybutyrate-co-4-hydroxybutyrate and polylactic acid according to a proportion, and sucking the mixture into a dehumidifier by using a vacuum adsorption device for drying treatment;
s2, mixing the auxiliary agents, selecting the auxiliary agents, weighing the auxiliary agents in proportion, and uniformly mixing the auxiliary agents;
s3, metering and conveying, conveying to the weighing equipment through the vacuum adsorption device again, weighing, adding to a feed chute of the extruder, and adding the mixed auxiliary agent;
s4, heat treatment, namely heating the material into a molten state by using a double-screw extruder, and continuously and uniformly conveying the material after passing through a melt filter;
s5, extruding and sheeting, wherein the melt is extruded and shaped at the die head of a double-screw extruder, and is cooled and shaped by a cooling roller with a smooth surface, and an online thickness meter is arranged to monitor the thickness in real time;
s6, stretching, namely, stretching the material transversely and longitudinally by using a stretcher, stretching to a specified magnification, and cooling to form a film;
and S7, reprocessing, cutting the edge position which does not meet the requirement, simultaneously processing the surface by using a corona processor, standing for 3-5h, and then rolling.
Preferably, the temperature of the dehumidifier in the step S1 is set to 100-130 ℃, and the time is 2.5-4 h.
Preferably, the temperature of the twin-screw extruder in step S4 is set to 150-.
Preferably, the thickness of the material extruded through the twin-screw extruder in step S5 can be finely adjusted according to the rotation speed of the cooling roll.
Preferably, the temperature of the transverse rolls of the stretcher in step S6 is set to 85-135 ℃ and the temperature of the longitudinal mixing is set to 45-65 ℃.
Preferably, the parameters of the magnification in step S6 are:
the transverse stretching ratio is 110-280% of the raw material;
the longitudinal stretching ratio is 330-400% of the raw material.
The invention also provides the improved PHA-based degradable plastic, which is prepared by the production process of the improved PHA-based degradable plastic.
The improved degradable plastic based on PHA and the production process thereof have the advantages that:
1. 60-80 parts of 3-hydroxybutyrate-co-4-hydroxybutyrate and cellulose are mutually fused, so that the interface adhesion is better, the processing performance of the bioplastic is improved, the production cost is reduced, and the market demand is met.
2. The method can realize the obvious forming effect on the PHA material through unique innovative materials and a processing, namely a stretching process, adopts a biaxial stretching process for one-time forming, optimizes the traditional production technology, improves the comprehensive performance of the material, and meets the production requirements of the process.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, the present invention provides a technical solution: a production process of PHA-based improved degradation plastic comprises the following raw material components in parts by weight:
60 parts of 3-hydroxybutyrate-co-4-hydroxybutyrate, 25 parts of polylactic acid, 30 parts of cellulose and 5 parts of auxiliary agent;
the auxiliary agent comprises the following components: one or more of light stabilizer, antioxidant, plasticizer, antiblocking agent and antistatic agent can ensure the comprehensive performance of the material.
Preferably, the method further comprises the following steps:
s1, drying and dehumidifying, namely premixing 3-hydroxybutyrate-co-4-hydroxybutyrate and polylactic acid according to a proportion, sucking the mixture into a dehumidifier by using a vacuum adsorption device for drying treatment, preventing materials from being adhered, and optimizing a drying process;
s2, mixing the auxiliary agents, selecting the auxiliary agents, weighing the auxiliary agents in proportion and uniformly mixing the auxiliary agents;
s3, metering and conveying, conveying to the weighing equipment through the vacuum adsorption device again, weighing, adding to a feed chute of the extruder, and adding the mixed auxiliary agent;
s4, performing heat treatment, namely heating the material into a molten state by using a double-screw extruder, and continuously and uniformly conveying the material after passing through a melt filter to ensure the quality of the extruded material;
s5, extruding and sheeting, wherein the melt is extruded and shaped at the die head of a double-screw extruder, and is cooled and shaped by a cooling roller with a smooth surface, and meanwhile, an online thickness meter is arranged to monitor the thickness in real time, so that the data can be mastered more conveniently;
s6, stretching, namely, performing transverse and longitudinal stretching treatment on the material by using a stretcher, and cooling to form a film after stretching to a specified multiplying power, wherein the method has the remarkable advantage of one-step forming;
s7, reprocessing, cutting the edge position which does not meet the requirement, simultaneously processing the surface by using a corona processor, standing for 3h, rolling, ensuring the stability of the product performance and finishing the product processing.
Preferably, in step S1, the temperature of the dehumidifier is set to 100 ℃ for 2.5 hours, so as to ensure the drying performance.
Preferably, in step S4, the twin-screw extruder is set at a temperature of 150 ℃ and a rotation speed of 30 rpm.
Preferably, the thickness of the material extruded by the twin-screw extruder in step S5 can be finely adjusted according to the rotation speed of the cooling roller, so as to increase the flexibility of the production process.
Preferably, the temperature of the transverse roller of the drawing machine in the step S6 is set to 85 ℃, the temperature of the longitudinal mixing is set to 45 ℃, and the temperature setting is crucial and plays a decisive role in the process flow.
Preferably, the parameters of the magnification in step S6 are:
the transverse stretching ratio is 110% of the raw material;
the longitudinal draw ratio was 330% of the raw material, and was set as the deformation limit data of the material.
Example two
Referring to fig. 1, the present invention provides a technical solution: a production process of PHA-based improved degradation plastic comprises the following raw material components in parts by weight:
80 parts of 3-hydroxybutyrate-co-4-hydroxybutyrate, 40 parts of polylactic acid, 36 parts of cellulose and 12 parts of auxiliary agent;
the auxiliary agent comprises the following components: one or more of light stabilizer, antioxidant, plasticizer, antiblocking agent and antistatic agent can ensure the comprehensive performance of the material.
Preferably, the method further comprises the following steps:
s1, drying and dehumidifying, namely premixing 3-hydroxybutyrate-co-4-hydroxybutyrate and polylactic acid according to a proportion, sucking the mixture into a dehumidifier by using a vacuum adsorption device for drying treatment, preventing materials from being adhered, and optimizing a drying process;
s2, mixing the auxiliary agents, selecting the auxiliary agents, weighing the auxiliary agents in proportion and uniformly mixing the auxiliary agents;
s3, metering and conveying, conveying to the weighing equipment through the vacuum adsorption device again, weighing, adding to a feed chute of the extruder, and adding the mixed auxiliary agent;
s4, performing heat treatment, namely heating the material into a molten state by using a double-screw extruder, and continuously and uniformly conveying the material after passing through a melt filter to ensure the quality of the extruded material;
s5, extruding and sheeting, wherein the melt is extruded and shaped at the die head of a double-screw extruder, and is cooled and shaped by a cooling roller with a smooth surface, and meanwhile, an online thickness meter is arranged to monitor the thickness in real time, so that the data can be mastered more conveniently;
s6, stretching, namely, performing transverse and longitudinal stretching treatment on the material by using a stretcher, and cooling to form a film after stretching to a specified multiplying power, wherein the method has the remarkable advantage of one-step forming;
s7, reprocessing, cutting the edge position which does not meet the requirement, simultaneously processing the surface by using a corona processor, standing for 5h, rolling, ensuring the stability of the product performance and finishing the product processing.
Preferably, in step S1, the temperature of the dehumidifier is set to 130 ℃ for 4 hours, so as to ensure the drying performance.
Preferably, in step S4, the twin-screw extruder is set to 180 ℃ and the rotation speed is 60 rpm.
Preferably, the thickness of the material extruded by the twin-screw extruder in step S5 can be finely adjusted according to the rotation speed of the cooling roller, so as to increase the flexibility of the production process.
Preferably, the temperature of the transverse roller of the drawing machine in the step S6 is set to 135 ℃, the temperature of the longitudinal mixing is set to 65 ℃, and the temperature setting is crucial and plays a decisive role in the process flow.
Preferably, the parameters of the magnification in step S6 are:
the transverse stretching ratio is 280% of the raw material;
the longitudinal draw ratio was 400% of the raw material, and was set as the deformation limit data of the material.
The invention also provides the improved PHA-based degradable plastic, which is prepared by the production process of the improved PHA-based degradable plastic.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The production process of the PHA-based improved degradable plastic is characterized by comprising the following raw material components in parts by weight:
60-80 parts of 3-hydroxybutyrate-co-4-hydroxybutyrate, 25-40 parts of polylactic acid, 30-36 parts of cellulose and 5-12 parts of auxiliary agent;
the auxiliary agent comprises the following components: one or more of light stabilizer, antioxidant, plasticizer, antiblocking agent and antistatic agent.
2. The process for the production of improved degradation plastics of PHA based on claim 1, wherein: the method comprises the following steps:
s1, drying and dehumidifying, namely premixing 3-hydroxybutyrate-co-4-hydroxybutyrate and polylactic acid according to a proportion, and sucking the mixture into a dehumidifier by using a vacuum adsorption device for drying treatment;
s2, mixing the auxiliary agents, selecting the auxiliary agents, weighing the auxiliary agents in proportion, and uniformly mixing the auxiliary agents;
s3, metering and conveying, conveying to the weighing equipment through the vacuum adsorption device again, weighing, adding to a feed chute of the extruder, and adding the mixed auxiliary agent;
s4, heat treatment, namely heating the material into a molten state by using a double-screw extruder, and continuously and uniformly conveying the material after passing through a melt filter;
s5, extruding and sheeting, wherein the melt is extruded and shaped at the die head of a double-screw extruder, and is cooled and shaped by a cooling roller with a smooth surface, and an online thickness meter is arranged to monitor the thickness in real time;
s6, stretching, namely, stretching the material transversely and longitudinally by using a stretcher, stretching to a specified magnification, and cooling to form a film;
and S7, reprocessing, cutting the edge position which does not meet the requirement, simultaneously processing the surface by using a corona processor, standing for 3-5h, and then rolling.
3. A process for the production of improved degradation plastics based on PHA as claimed in claim 2, wherein: in step S1, the temperature of the dehumidifier is set to 100-.
4. A process for the production of improved degradation plastics based on PHA as claimed in claim 2, wherein: the temperature of the twin-screw extruder in the step S4 is set to 150 ℃ and 180 ℃, and the rotating speed is 30-60 rpm.
5. A process for the production of improved degradation plastics based on PHA as claimed in claim 2, wherein: the thickness of the material extruded by the twin-screw extruder in step S5 can be finely adjusted depending on the rotational speed of the cooling roll.
6. A process for the production of improved degradation plastics based on PHA as claimed in claim 2, wherein: in step S6, the temperature of the transverse roller of the stretcher is set to be 85-135 ℃, and the temperature of the longitudinal mixing is set to be 45-65 ℃.
7. A process for the production of improved degradation plastics based on PHA as claimed in claim 2, wherein: the parameters of the magnification in step S6 are:
the transverse stretching ratio is 110-280% of the raw material;
the longitudinal stretching ratio is 330-400% of the raw material.
8. An improved degradation plastic based on PHA, characterized in that: the process for the production of PHA-based improved degradation plastics of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110567870.7A CN113185822A (en) | 2021-05-24 | 2021-05-24 | PHA-based improved degradable plastic and production process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110567870.7A CN113185822A (en) | 2021-05-24 | 2021-05-24 | PHA-based improved degradable plastic and production process thereof |
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| CN113185822A true CN113185822A (en) | 2021-07-30 |
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| CN202110567870.7A Withdrawn CN113185822A (en) | 2021-05-24 | 2021-05-24 | PHA-based improved degradable plastic and production process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024007494A1 (en) * | 2022-07-06 | 2024-01-11 | 北京蓝晶微生物科技有限公司 | Polyhydroxyalkanoate molded body and preparation method therefor |
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2021
- 2021-05-24 CN CN202110567870.7A patent/CN113185822A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024007494A1 (en) * | 2022-07-06 | 2024-01-11 | 北京蓝晶微生物科技有限公司 | Polyhydroxyalkanoate molded body and preparation method therefor |
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Application publication date: 20210730 |