CN110294923B - Micro-foaming full-biodegradable polymer sheet and preparation method thereof - Google Patents
Micro-foaming full-biodegradable polymer sheet and preparation method thereof Download PDFInfo
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Abstract
The invention provides a micro-foaming full-biodegradable polymer sheet and a preparation method thereof. The micro-foaming full-biodegradable polymer sheet comprises the following components in parts by weight: 100 parts of full-biodegradable polymer, 3-12 parts of microsphere foaming agent master batch, 10-50 parts of bio-based filler and 3-8 parts of glycerol; the microsphere foaming agent master batch comprises the following components in parts by mass: 100 parts of polymer capable of being melt-processed at low temperature, 50-100 parts of microsphere foaming agent and 5-10 parts of compatilizer. The fully biodegradable sheet material has the advantages of high foaming ratio, low density, good toughness, strong impact resistance and other excellent mechanical properties, can be used for manufacturing fast consumer goods such as lunch boxes and the like, and has higher application value and good application prospect.
Description
Technical Field
The invention relates to the field of processing and forming of high polymer materials, in particular to a micro-foaming full-biodegradable polymer sheet and a preparation method thereof.
Background
In modern life, people pay more and more attention to resources and environmental problems, the production of full-biodegradable products by renewable resources is the main development direction in the future, and the full-biodegradable products can be decomposed into water and carbon dioxide by microorganisms in a natural state after being used, so that the environment is not polluted. The traditional foamed plastic is polyethylene, polypropylene, polyvinyl chloride, polystyrene and other plastics, is excellent in light weight, heat insulation, sound insulation, buffering and the like, and is widely applied to the aspects of insulation, buffering, absorption, bearing structures and the like. But all are not degradable plastics, can hardly be decomposed after being used in natural environment, and generate a large amount of toxic and harmful gases after incineration treatment, thereby seriously polluting the natural environment.
The foaming full-biodegradable polymer material filled with the bio-based filler can be widely applied to the fields of food packaging, automobiles, buildings, synthetic wood, sports goods and the like due to low density, better mechanical strength, heat insulation and sound insulation properties and environmental protection degradability.
At present, the full-biodegradable polymer foamed sheet can be prepared by physical or chemical foaming, and the physical foaming method mainly comprises a supercritical carbon dioxide foaming method, which has the defects of higher requirement on equipment and higher process cost; the chemical foaming method is mainly characterized in that a chemical foaming agent such as an AC foaming agent is added into a matrix for forming, and the defects are that the requirement on the fluidity of the matrix is high, secondary pollution is generated, the chemical foaming method is not suitable for the field of food packaging with high sanitary grade, the requirement on production process conditions is strict, and the process is difficult to control.
Disclosure of Invention
In view of the problems in the background art, the invention aims to provide a micro-foamed fully biodegradable polymer sheet and a preparation method thereof, and the obtained fully biodegradable sheet has high foaming ratio, low density, good toughness, strong impact resistance and other excellent mechanical properties, can be used for manufacturing fast consumer goods such as lunch boxes and the like, and has higher application value and good application prospect.
In order to achieve the above object, in a first aspect, the present invention provides a micro-foamed fully biodegradable polymer sheet, comprising the following components in parts by mass: 100 parts of full-biodegradable polymer, 3-12 parts of microsphere foaming agent master batch, 10-50 parts of bio-based filler and 3-8 parts of glycerol; the microsphere foaming agent master batch comprises the following components in parts by mass: 100 parts of polymer capable of being melt-processed at low temperature, 50-100 parts of microsphere foaming agent and 5-10 parts of compatilizer.
Further, the fully biodegradable polymer is one or a combination of polylactic acid (PLA), polybutylene adipate/terephthalate (PBAT), polybutylene succinate (PBS), polybutylene succinate-adipate (PBSA), polymethylethylene carbonate (PPC), polybutylene terephthalate-co-butylene succinate (PBST), poly 3-hydroxybutyrate (PHB), polyglycolic acid (PGA), Polycaprolactone (PCL), Polyhydroxyalkanoate (PHA), polyhydroxybutyrate valerate (PHBV).
Further, the polymer capable of being melt-processed at low temperature is one or a combination of ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-octene copolymer and paraffin; the microsphere foaming agent is one or a combination of an acrylonitrile copolymer containing low-boiling-point hydrocarbons, an acrylic copolymer containing low-boiling-point hydrocarbons and an ethylene-vinyl acetate copolymer containing low-boiling-point hydrocarbons; the compatilizer is one or a combination of glycidyl methacrylate grafted ethylene propylene copolymer and glycidyl methacrylate grafted ethylene-vinyl acetate copolymer.
Further, the bio-based filler is one or a combination of corn starch, thermoplastic starch, wood powder, rice hull powder, cotton fiber, hemp fiber, bamboo fiber and wood pulp fiber.
Further, the bio-based filler is bamboo fiber, and the length-diameter ratio is 3:1-20: 1.
Further, the bio-based filler is treated by a coupling agent, and the coupling agent comprises one or a combination of silicone, a silane coupling agent, a titanate coupling agent and an aluminate coupling agent.
Further, the processing aid is at least one or a combination of dioctyl phthalate, glycerol, ethylene glycol, propylene glycol, butylene glycol, polyethylene glycol, sorbitol, polypropylene glycol, di- (2-ethylhexyl) adipate, dibutyl phthalate and sorbitol acetate.
In order to achieve the above object, in a second aspect, the present invention provides a method for preparing a micro-foamed all-biodegradable polymer sheet, for preparing the micro-foamed all-biodegradable polymer sheet according to the first aspect of the present invention, comprising the steps of: (1) weighing 100 parts of polymer capable of being subjected to low-temperature melting processing, 50-100 parts of microsphere foaming agent and 5-10 parts of compatilizer according to the mass ratio, mixing for 1-20min by using a mixer, then mixing by using an internal mixer, and finally extruding and granulating by using a single-screw granulator or a double-screw granulator to obtain microsphere foaming agent master batches; (2) weighing 100 parts of full biodegradable polymer, 3-12 parts of microsphere foaming agent master batch, 3-8 parts of compatilizer, 10-50 parts of bio-based filler and 3-8 parts of processing aid glycerol according to the mass ratio, mixing in a high-speed mixer at the rotating speed of 100-1000r/min for 10-30min to obtain a material to be processed; (3) and adding the material to be processed into a charging barrel of a single-screw extruder, and extruding and molding to obtain the micro-foamed full-biodegradable polymer sheet.
Further, the temperature of the internal mixer is 30-135 ℃; the extrusion temperature of the single-screw granulator is 100-130 ℃; the double-screw granulator is a 65-grade double screw, the extrusion temperature is 100-135 ℃, the rotation speed of the screw is 10-60r/min, the temperature of each zone of the machine barrel is T1-150 ℃, T2-160 ℃, T3-160 ℃, T4-180 ℃, T5-190 ℃, and the rotation speed of the screw is 10-60 r/min.
Furthermore, the foaming multiplying power of the micro-foaming full-biodegradable polymer sheet is 2-5 times, and the tensile strength is more than 18 MPa.
The invention uses the microsphere foaming agent and the bio-based filler in a composite way, prepares the micro-foaming full-biodegradable polymer sheet by the existing extrusion molding equipment, and has the following beneficial effects:
(1) the invention uses the microsphere foaming agent as the foaming agent of the full-biodegradable polymer for the first time. The microsphere foaming agent has a typical core-shell structure, when the microsphere foaming agent is heated, the shell is softened, the low-boiling-point hydrocarbon gas in the microsphere foaming agent expands, and the microsphere foaming agent foams in the full-biodegradable polymer; the shell of the foamed microsphere foaming agent has better thermal elasticity, and under the action of the compatilizer selected by the invention, the outer surface of the shell has better binding force with the fully biodegradable polymer, so that the microsphere foaming agent forms an air-sac-like 'sea-island' structure in the fully biodegradable polymer, and the microsphere foaming agent not only plays a role of foaming, reduces the apparent density, but also improves the toughness and the impact resistance of the fully biodegradable polymer; the invention adopts a unique process to successfully prepare the micro-foaming fully biodegradable polymer sheet with a micro closed pore structure and a foaming rate of 2-5 times, the tensile strength of the sheet can reach more than 18MPa, and the toughness and the impact resistance of the sheet are obviously superior to those of the fully biodegradable polymer foamed sheet prepared by the traditional foaming methods such as a chemical foaming agent and the like.
(2) Firstly, a microsphere foaming agent, a low-temperature melt-processable polymer and a compatilizer are jointly made into a microsphere foaming agent master batch, and the dispersibility of the microsphere foaming agent in the fully biodegradable polymer can be obviously improved by the microsphere foaming agent master batch; the compatilizer in the microsphere foaming agent master batch is used for improving the compatibility between the low-temperature melt-processable polymer and the fully biodegradable polymer and further improving the dispersibility of the microsphere foaming agent.
(3) As one of the bio-based fillers, the bamboo fiber has a suitable length-diameter ratio and plasticity within the temperature range of 100-140 ℃; in the micro-foaming fully biodegradable polymer sheet, the addition amount of the bamboo fiber reaches more than 30%, so that the filler plays a role in reducing the cost, and simultaneously plays a role in increasing the strength and the rigidity, and the mechanical strength of the polymer sheet lost due to foaming is maintained; in addition, because the bamboo fiber contains about 30 percent of pentose component, caramel taste is emitted after the sheet is processed, and the prepared product is suitable for being applied to catering packaging related industries.
(4) The existing equipment is utilized to successfully realize extrusion molding of the micro-foamed fully biodegradable polymer sheet, and the method has the characteristics of high production efficiency, simple equipment and low cost.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
First, a micro-foamed fully biodegradable polymer sheet according to the first aspect of the present invention will be described.
The micro-foaming full-biodegradable polymer sheet comprises the following components in parts by mass: 100 parts of full-biodegradable polymer, 3-12 parts of microsphere foaming agent master batch, 10-50 parts of bio-based filler and 3-8 parts of glycerol. The microsphere foaming agent master batch comprises the following components in parts by mass: 100 parts of polymer capable of being melt-processed at low temperature, 50-100 parts of microsphere foaming agent and 5-10 parts of compatilizer.
In one embodiment, the fully biodegradable polymer is one or a combination of polylactic acid (PLA), polybutylene adipate/terephthalate (PBAT), polybutylene succinate (PBS), polybutylene succinate-adipate (PBSA), polymethylethylene carbonate (PPC), polybutylene terephthalate-co-succinate (PBST), poly 3-hydroxybutyrate (PHB), polyglycolic acid (PGA), Polycaprolactone (PCL), Polyhydroxyalkanoate (PHA), polyhydroxybutyrate valerate (PHBV).
In one embodiment, the low-temperature melt processable polymer is one or a combination of an ethylene-vinyl acetate copolymer, an ethylene-acrylic acid copolymer, an ethylene-octene copolymer, and paraffin wax; the microsphere foaming agent is one or a combination of an acrylonitrile copolymer containing low-boiling-point hydrocarbons, an acrylic copolymer containing low-boiling-point hydrocarbons and an ethylene-vinyl acetate copolymer containing low-boiling-point hydrocarbons; the compatilizer is one or a combination of glycidyl methacrylate grafted ethylene propylene copolymer and glycidyl methacrylate grafted ethylene-vinyl acetate copolymer.
In one embodiment, the bio-based filler is one or a combination of corn starch, thermoplastic starch, wood flour, rice hull flour, cotton fiber, hemp fiber, bamboo fiber, and wood pulp fiber.
In one embodiment, the bio-based filler is bamboo fiber, and the length-diameter ratio is 3:1 to 20: 1.
In one embodiment, the bio-based filler is treated with a coupling agent comprising one or a combination of a silicone, a silane coupling agent, a titanate coupling agent, an aluminate coupling agent.
In one embodiment, the processing aid is at least one or a combination of dioctyl phthalate, glycerin, ethylene glycol, propylene glycol, butylene glycol, polyethylene glycol, sorbitol, polypropylene glycol, di- (2-ethylhexyl) adipate, dibutyl phthalate, and sorbitol acetate.
Next, a method for preparing the micro-foamed fully biodegradable polymer sheet according to the second aspect of the present invention will be described.
The method for preparing a micro-foamed fully biodegradable polymer sheet according to the second aspect of the present invention is used for preparing the micro-foamed fully biodegradable polymer sheet according to the first aspect of the present invention, and comprises the steps of: (1) weighing 100 parts of polymer capable of being subjected to low-temperature melting processing, 50-100 parts of microsphere foaming agent and 5-10 parts of compatilizer according to the mass ratio, mixing for 1-20min by using a mixer, then mixing by using an internal mixer, and finally extruding and granulating by using a single-screw granulator or a double-screw granulator to obtain microsphere foaming agent master batches; (2) weighing 100 parts of full biodegradable polymer, 3-12 parts of microsphere foaming agent master batch, 3-8 parts of compatilizer, 10-50 parts of bio-based filler and 3-8 parts of processing aid glycerol according to the mass ratio, mixing in a high-speed mixer at the rotating speed of 100-1000r/min for 10-30min to obtain a material to be processed; (3) and adding the material to be processed into a charging barrel of a single-screw extruder, and extruding and molding to obtain the micro-foamed full-biodegradable polymer sheet.
In one embodiment, the internal mixer temperature is 30-135 ℃; the extrusion temperature of the single-screw granulator is 100-130 ℃; the double-screw granulator is a 65-grade double screw, the extrusion temperature is 100-135 ℃, the rotation speed of the screw is 10-60r/min, the temperature of each zone of the machine barrel is T1-150 ℃, T2-160 ℃, T3-160 ℃, T4-180 ℃, T5-190 ℃, and the rotation speed of the screw is 10-60 r/min.
In one embodiment, the micro-foamed fully biodegradable polymer sheet has a foaming ratio of 2 to 5 times and a tensile strength of 18MPa or more.
The following will specifically explain the preparation method of the micro-foamed fully biodegradable polymer sheet of the present invention with reference to specific examples.
Example 1
(1) Weighing 100 parts of ethylene-vinyl acetate copolymer with the model of E40-L from Mitsui chemical company, 50 parts of acrylonitrile copolymer containing low-boiling-point hydrocarbons with the model of 920DU40 from Acksonobel company and 5 parts of methacrylic acid glycidyl ether grafted ethylene propylene copolymer according to the mass ratio, mixing in a mixer, mixing by using an internal mixer, and finally extruding and granulating by using a single-screw extruder to obtain microsphere foaming agent master batches; wherein the temperature of the internal mixer is 110 ℃, the temperature of each zone of a machine barrel of the single-screw extruder is T1-80 ℃, T2-85 ℃, T3-90 ℃, T4-120 ℃, the temperature of a machine head is 110 ℃, and the rotating speed of a screw is 30 r/min;
(2) weighing 100 parts of polylactic acid, 3 parts of microsphere foaming agent master batch, 10 parts of corn starch treated by silane coupling agent and 3 parts of glycerol according to the mass ratio, and mixing in a high-speed mixer at the rotating speed of 100r/min for 10min to obtain a material to be processed;
(3) adding the material to be processed into a charging barrel of a single-screw extruder, and extruding and molding to obtain a micro-foamed fully biodegradable polymer sheet; the temperature of each zone of the cylinder is T1-150 ℃, T2-160 ℃, T3-160 ℃, T4-180 ℃, T5-190 ℃, and the screw speed is 10 r/min.
Example 2
(1) Weighing 100 parts of 5980I ethylene-acrylic acid copolymer of the Dow chemical company, 100 parts of 909DU80 acrylonitrile copolymer containing low boiling point hydrocarbons of the Aksu Nobel company and 10 parts of glycidyl methacrylate grafted ethylene-vinyl acetate copolymer according to the mass ratio, mixing in a mixer, mixing by using an internal mixer, and finally extruding and granulating by using a double-screw extruder to obtain microsphere foaming agent master batches; wherein the temperature of the internal mixer is 100 ℃, the temperature of each zone of a cylinder of the double-screw extruder is T1-80 ℃, T2-85 ℃, T3-90 ℃, T4-110 ℃, the head temperature is 100 ℃, and the screw speed is 30 r/min;
(2) weighing 100 parts of poly (butylene adipate/terephthalate) (PBAT), 12 parts of microsphere foaming agent master batch, 50 parts of wood powder treated by titanate coupling agent and 8 parts of glycerol according to the mass ratio, and mixing in a high-speed mixer at the rotating speed of 1000r/min for 30min to obtain a material to be processed;
(3) adding the material to be processed into a charging barrel of a single-screw extruder, and extruding and molding to obtain a micro-foamed fully biodegradable polymer sheet; the temperature of each zone of the cylinder is T1 ═ 120 ℃, T2 ═ 140 ℃, T3 ═ 150 ℃, T4 ═ 170 ℃, T5 ═ 170 ℃, and the screw speed is 10 r/min.
Example 3
(1) Weighing 100 parts of ethylene-octene copolymer with the model of POE8200 of the Dow chemical company, 80 parts of acrylonitrile copolymer containing low-boiling-point hydrocarbons with the model of 051DU40 of the Acksonobel company and 8 parts of methacrylic acid glycidyl ether grafted ethylene propylene copolymer according to the mass ratio, mixing in a mixer, mixing by using an internal mixer, and finally extruding and granulating by using a single-screw extruder to obtain microsphere foaming agent master batches; wherein the temperature of the internal mixer is 90 ℃, the temperature of each zone of the machine barrel of the single-screw extruder is T1 ═ 70 ℃, T2 ═ 80 ℃, T3 ═ 90 ℃, T4 ═ 100 ℃, the head temperature is 100 ℃, and the screw speed is 30 r/min;
(2) weighing 100 parts of polypropylene, 8 parts of microsphere foaming agent master batch, 30 parts of bamboo fiber treated by aluminate coupling agent and 6 parts of glycerol according to the mass ratio, and mixing in a high-speed mixer at the rotating speed of 600r/min for 10min to obtain a material to be processed;
(3) adding the material to be processed into a charging barrel of a single-screw extruder, and extruding and molding to obtain a micro-foamed fully biodegradable polymer sheet; the temperature of each zone of the cylinder is T1 ═ 140 ℃, T2 ═ 160 ℃, T3 ═ 180 ℃, T4 ═ 195 ℃, T5 ═ 190 ℃, and the screw speed is 10 r/min.
Comparative example 1
Weighing 100 parts of polylactic acid, 25 parts of bamboo fiber and 1 part of AC foaming agent master batch according to the mass ratio, and mixing in a high-speed mixer at the rotating speed of 300r/min for 10min to obtain a material to be processed; adding the material to be processed into a charging barrel of a single-screw extruder, and extruding and molding to obtain a foamed full-biodegradable polymer sheet; the temperature of each zone of the cylinder is T1 ═ 120 ℃, T2 ═ 140 ℃, T3 ═ 150 ℃, T4 ═ 170 ℃, T5 ═ 170 ℃, and the screw speed is 10 r/min.
Comparative example 2
Weighing 100 parts of poly (butylene adipate/terephthalate) (PBAT) and 20 parts of wood powder according to the mass ratio, and mixing in a high-speed mixer at the rotating speed of 300r/min for 10min to obtain a material to be processed; adding the material to be processed into a charging barrel of a single-screw extruder, and extruding and molding to obtain a fully biodegradable polymer sheet; the temperature of each zone of the cylinder is T1 ═ 120 ℃, T2 ═ 140 ℃, T3 ═ 150 ℃, T4 ═ 170 ℃, T5 ═ 170 ℃, and the screw speed is 10 r/min.
Performance testing
1. Measurement of tensile Strength and elongation at Break
According to the test conditions for films and sheets, part 3 of the national Standard "determination of tensile Properties of plastics" (GB \ T1040.3-2006): the dumbbell specimens have a length of 150mm, a narrow parallel width of 10mm, a drawing speed of 50mm/min and a room temperature of 25 ℃.
2. Density test
The apparent density is measured by citing national standard 'foam and rubber Density determination test' (GBT 6343-2009).
3. Impact strength
The national standard of 'determination of impact strength of plastic cantilever beam' (GB/T1843-.
The results of the performance tests are shown in table 1.
Table 1 results of performance testing
The above examples show that after the bio-based filler such as bamboo fiber and the microsphere foaming agent master batch are added into the fully biodegradable polymer, the apparent density of the sheet formed by micro foaming is obviously reduced, and the physical properties such as tensile strength, impact strength, elongation at break and the like, which represent strength and toughness, are greatly improved compared with the foamed fully biodegradable polymer sheet obtained by AC foaming.
The micro-foaming full-biodegradable polymer sheet can be widely applied to the packaging field of industries such as industry, express delivery, food, daily chemicals and the like.
Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (7)
1. The micro-foaming full-biodegradable polymer sheet is characterized by comprising the following components in parts by mass: 100 parts of full-biodegradable polymer, 3-12 parts of microsphere foaming agent master batch, 10-50 parts of bio-based filler and 3-8 parts of glycerol; the microsphere foaming agent master batch comprises the following components in parts by mass: 100 parts of polymer capable of being melt-processed at low temperature, 50-100 parts of microsphere foaming agent and 5-10 parts of compatilizer;
the full-biodegradable polymer is one or a combination of polylactic acid (PLA), polybutylene adipate/terephthalate (PBAT), polybutylene succinate (PBS), polybutylene succinate-adipate (PBSA), polymethyl ethylene carbonate (PPC), polybutylene terephthalate-co-butylene succinate (PBST), polyglycolic acid (PGA), Polycaprolactone (PCL) and Polyhydroxyalkanoate (PHA);
the polymer capable of being melt-processed at low temperature is one or a combination of ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-octene copolymer and paraffin; the microsphere foaming agent is one or a combination of an acrylonitrile copolymer containing low-boiling-point hydrocarbons, an acrylic copolymer containing low-boiling-point hydrocarbons and an ethylene-vinyl acetate copolymer containing low-boiling-point hydrocarbons; the compatilizer is one or a combination of glycidyl methacrylate grafted ethylene propylene copolymer and glycidyl methacrylate grafted ethylene-vinyl acetate copolymer;
the preparation method of the microsphere foaming agent master batch comprises the following steps: weighing 100 parts of polymer capable of being subjected to low-temperature melting processing, 50-100 parts of microsphere foaming agent and 5-10 parts of compatilizer according to the mass ratio, mixing for 1-20min by using a mixer, then mixing by using an internal mixer, wherein the temperature of the internal mixer is 30-135 ℃, and finally extruding and granulating by using a single-screw granulator or a double-screw granulator to obtain microsphere foaming agent master batches; the extrusion temperature of the single-screw granulator is 100-130 ℃; the twin-screw granulator is 65-grade twin screws, the extrusion temperature is 100-135 ℃, and the rotating speed of the screws is 10-60 r/min.
2. The micro-foamed biodegradable polymer sheet according to claim 1, wherein said biodegradable polymer is one or a combination of poly 3-hydroxybutyrate (PHB), polyhydroxybutyrate valerate (PHBV).
3. The micro-foamed fully biodegradable polymer sheet according to claim 1, wherein the bio-based filler is one or a combination of corn starch, thermoplastic starch, wood flour, rice hull flour, cotton fiber, hemp fiber, bamboo fiber, and wood pulp fiber.
4. The micro-foamed fully biodegradable polymer sheet according to claim 1, wherein said bio-based filler is bamboo fiber having an aspect ratio of 3:1 to 20: 1.
5. The micro-foamed fully biodegradable polymer sheet according to claim 1, wherein the bio-based filler is treated with a coupling agent comprising one or a combination of silicone, silane coupling agent, titanate coupling agent, aluminate coupling agent.
6. A method for preparing a micro-foamed fully biodegradable polymer sheet according to any one of claims 1 to 5, comprising the steps of:
(1) weighing 100 parts of polymer capable of being subjected to low-temperature melting processing, 50-100 parts of microsphere foaming agent and 5-10 parts of compatilizer according to the mass ratio, mixing for 1-20min by using a mixer, then mixing by using an internal mixer, wherein the temperature of the internal mixer is 30-135 ℃, and finally extruding and granulating by using a single-screw granulator or a double-screw granulator to obtain microsphere foaming agent master batches; the extrusion temperature of the single-screw granulator is 100-130 ℃; the twin-screw granulator is 65-grade twin screws, the extrusion temperature is 100-135 ℃, and the rotating speed of the screws is 10-60 r/min;
(2) weighing 100 parts of full biodegradable polymer, 3-12 parts of microsphere foaming agent master batch, 10-50 parts of bio-based filler and 3-8 parts of processing aid glycerol according to the mass ratio, mixing in a high-speed mixer at the rotating speed of 100-1000r/min for 10-30min to obtain a material to be processed;
(3) adding the material to be processed into a charging barrel of a single-screw extruder, and extruding and molding to obtain a micro-foamed fully biodegradable polymer sheet;
the single-screw extruder has the barrel with the temperature of all the zones T1=150 ℃, T2=160 ℃, T3=160 ℃, T4=180 ℃, T5=190 ℃ and the screw rotating speed of 10-60 r/min.
7. The method for producing a micro-foamed completely biodegradable polymer sheet according to claim 6, wherein the micro-foamed completely biodegradable polymer sheet has a foaming ratio of 2 to 5 times and a tensile strength of 18MPa or more.
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| CN111138814A (en) * | 2020-01-16 | 2020-05-12 | 快思瑞科技(上海)有限公司 | Light high-strength PBT (polybutylene terephthalate) material and preparation method thereof |
| CN113512275A (en) * | 2020-04-10 | 2021-10-19 | 上海茗露新材料科技有限公司 | High-melt-strength compostable degradable material and preparation method thereof |
| CN115505242B (en) * | 2021-06-07 | 2024-03-29 | 国家能源投资集团有限责任公司 | Full-biodegradable foam material and preparation method and application thereof |
| CN115505247B (en) * | 2021-06-07 | 2024-04-02 | 国家能源投资集团有限责任公司 | Full-biodegradable micron foaming material and preparation method and application thereof |
| CN113583400A (en) * | 2021-08-27 | 2021-11-02 | 浙江新恒泰新材料有限公司 | Degradable foaming material and preparation method thereof |
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