CN107083006A - A kind of method for producing biodegradable foamed plastic - Google Patents
A kind of method for producing biodegradable foamed plastic Download PDFInfo
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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
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/02—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to polysaccharides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
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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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
- C08J9/141—Hydrocarbons
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/06—CO2, N2 or noble gases
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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
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
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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
- C08J2351/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2351/02—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to polysaccharides
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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
- C08J2467/02—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
- 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
- C08L2203/00—Applications
- C08L2203/14—Applications used for foams
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- Biological Depolymerization Polymers (AREA)
Abstract
The present invention relates to technical field of polymer materials, more particularly to a kind of method that biodegradable foamed plastic is produced with butyl acrylate graft modification starch.The present invention is achieved through the following technical solutions：Starch and butyl acrylate are first subjected to graft copolymerization, modified starch is made, adjustment modified starch water content is simultaneously granulated, after the biological Biodegradable polyester drying process such as poly-succinic acid-butanediol, mixed in proportion with aforementioned modified starch pellet, it is put into extruder and carries out physical blowing, Biodegradable foam plastic product is made.Biodegradable by the foamed plastics obtained by this method, processing and performance are good, and production cost is low, with larger competitive advantage and wide market prospects.
Description
Technical field
The present invention relates to technical field of polymer materials, more particularly to a kind of side for producing biodegradable foamed plastic
Method.
Background technology
Petroleum based foams plastics largely using in life, while being offered convenience to the mankind, also results in environment
And its serious negative effect.The foamed plastics given up is difficult to degrade, and also contains substantial amounts of noxious material, not only to land
Ground, returns the ecological environments such as ocean and causes very serious burden.Therefore in recent years, people researching and developing always it is various can
The bio-based foamed plastic that burden is not resulted in natural environment of degraded.At present, foamed plastic is produced with poly-lactic acid material
The technology of the existing many comparative maturities of product.Such as a kind of Publication No. CN1544525A biodegradable PLA foam plastic
Preparation method for material；Notification number is CN103642185A Polylactic acid foam material and preparation method thereof, etc..Aforementioned techniques are manufactured
Although foamed plastics can be biodegradable, be due to price reasons, the market of obtained foamed plastics is pushed away in aforementioned manners
Wide difficulty is larger.To reduce cost, also there are many technologies to use starches as the raw material of foamed plastics to produce foamed plastics.
CN01132749.9 discloses a kind of raw material bag of foamed plastics in preparation of starch based biodegradable foamed plastics, this method
Include starch acrylate ester, styrene, butyl acrylate, butyl acrylate, auxiliary agent；CN200610069806.1 discloses a kind of profit
With EVA, PE and starch composite foam material preparation method, this method is using EVA, PE as primary raw material, with starch and inorganic
Powder is auxiliary material, and is equipped with glycerine, crosslinking agent, blowing agent AC and surface modifier to prepare foamed plastics.Although above-mentioned technology
Starch be make use of as the raw material of foamed plastics, but add larger amount of petroleum-based plastics in the art, this has a strong impact on
The degradation property of the foamed plastics produced.
The content of the invention
In order to make up the defect of above-mentioned technical proposal, biological it can be dropped with modified starch production the invention provides a kind of new
The method for solving foamed plastic.
The present invention is achieved through the following technical solutions：
A kind of method that biodegradable foamed plastic is produced with butyl acrylate graft modification starch, its feature exists
In there is following steps composition：
A. starch and butyl acrylate are subjected to graft copolymerization, modified starch is made, butyl acrylate content is little
In 30wt%；
B. the water content of modified starch is adjusted, it is 15-30wt% to make moisture；
C. modified starch step B obtained passes through extruder extruding pelletization；
D. pellet drying step C obtained to water content is no more than 3wt%, obtains grain one；
E. choose fully biodegradable resin granular material and processing is dried, obtain grain two；
F. grain one and grain two are mixed in proportion and is put into extruder hopper, carried out physical blowing, obtain biodegradable
Foamed plastic.
It is preferred that, wherein in the step A, percentage by weight shared by the butyl acrylate added during starch conversion is 7--
20wt%.
It is preferred that, wherein in the step C, extruding dies temperature is no more than 60 DEG C.
It is preferred that, wherein in the step D, drying temperature is no more than 60 DEG C.
It is preferred that, wherein in the step E, the fully biodegradable resin is poly terephthalic acid-adipic acid-fourth
One in glycol, poly-succinic-butanediol, poly-succinic-adipic acid-butanediol, poly terephthalic acid-succinic acid-butanediol
Plant or several combinations.
It is preferred that, wherein in the step F, percentage by weight shared by grain two is 10--50wt%.
It is preferred that, wherein in the step F, percentage by weight shared by grain two is 30--40wt%.
It is preferred that, wherein in the step F, being additionally added maleic anhydride and benzoyl peroxide.
It is preferred that, wherein percentage by weight shared by maleic anhydride is 1-3%, and percentage by weight shared by benzoyl peroxide is
0.1-0.5%.
It is preferred that, wherein in the step F, physical blowing agent is nitrogen or carbon dioxide.
The beneficial effects of the invention are as follows：Being produced the invention provides one kind with butyl acrylate graft modification starch to give birth to
The method of thing degraded foamed plastic, this method is that starch first has been carried out into graft modification, is then entered again with biodegradable resin
Row processing foaming.The foamed plastic produced with the invention is because its main component is starch, and the resin added is also
Biodegradable, therefore, the foamed plastic can carry out biodegradation.Secondly, it is of the invention by materials such as poly-succinic acid-butanediols
Expect to be used to arrive foamed plastic field；Finally, the foamed plastic involved by the invention is because used larger amount of inexpensive
Starch, so product has good price competitiveness and wide market prospects.
Embodiment
The present invention is described in further detail below by specific embodiment, but these embodiments are only that citing
Illustrate, the scope of the present invention is not defined.
Embodiment one
9000g cornstarch is put into the stirred autoclave for filling 20000g deionized waters, be stirring evenly and then adding into
1000g butyl acrylates, then add catalyst ammonium ceric nitrate into stirred autoclave again, continue to stir, until reaction 2-3 is small
When.Reaction product is exported from stirred autoclave and is put into centrifuge and removes water, modified starch is produced, modified starch is put into
Dried in drier, dry water content to 20wt%.Then the modified starch of the water content is passed through into direct bleeder single screw rod
Extruder is granulated.Wherein extruder rotating speed 20r/min, draw ratio is 40, and temperature setting is 90 DEG C of feeding section, the first compression
115 DEG C of section, 115 DEG C of the first homogenizing zone, 100 DEG C of exhaust section, 120 DEG C of the second compression section, 110 DEG C of the second homogenizing zone.
Gained pellet is put into drier, it is 60 DEG C to set drying temperature, dries 8 hours, obtains grain one.
Poly-succinic acid-butanediol is put into drier, drying temperature is 80 DEG C, dries 12 hours, obtains grain two.
Take the grain two of the parts by weight of grain one and 40 of 60 parts by weight is well mixed to be put into foaming machine (what the present embodiment selected is precious
Pearl cotton foaming machine, wherein extruder screw draw ratio are 55, and screw speed is 5-50r/min, heating-up temperature be set to 90 DEG C,
110 DEG C, 130 DEG C, 130 DEG C, 120 DEG C, foaming agent is butane) hopper, at the same time, take the maleic anhydride and 0.1 weight of 1 parts by weight
Extruder is uniformly added into after the benzoyl peroxide mixing of amount part in proportion, above-mentioned material is rotated and added with screw rod in an extruder
Thermal heat, after batch mixing, thawings, homogenizing, butane gas inject, mix homogenizing, extrusion, cooling and shaping, sizing sectility, into
The processes such as product, obtain biodegradable foam plastic product.
Example two
8000g cornstarch is put into the stirred autoclave for filling 20000g deionized waters, be stirring evenly and then adding into
2000g butyl acrylates, then add catalyst ammonium ceric nitrate into stirred autoclave again, continue to stir, until reaction 2-3 is small
When.Reaction product is exported from stirred autoclave and is put into centrifuge and removes water, modified starch is produced, modified starch is put into
Dried in drier, dry water content to 25wt%.Then the modified starch of the water content is passed through into direct bleeder single screw rod
Extruder is granulated.Wherein extruder rotating speed 20r/min, draw ratio is 40, and temperature setting is 90 DEG C of feeding section, the first compression
115 DEG C of section, 115 DEG C of the first homogenizing zone, 100 DEG C of exhaust section, 120 DEG C of the second compression section, 110 DEG C of the second homogenizing zone.
Gained pellet is put into drier, it is 60 DEG C to set drying temperature, dries 12 hours, obtains grain one.
Poly-succinic acid-butanediol is put into drier, drying temperature is 90 DEG C, dries 10 hours, obtains grain two.
Take the grain two of the parts by weight of grain one and 20 of 80 parts by weight is well mixed to be put into foaming machine (what the present embodiment selected is precious
Pearl cotton foaming machine, wherein extruder screw draw ratio are 55, and screw speed is 5-50r/min, heating-up temperature be set to 90 DEG C,
110 DEG C, 130 DEG C, 130 DEG C, 120 DEG C, foaming agent is butane) hopper, at the same time, take the maleic anhydride and 0.3 weight of 2 parts by weight
Extruder is uniformly added into after the benzoyl peroxide mixing of amount part in proportion, above-mentioned material is rotated and added with screw rod in an extruder
Thermal heat, after batch mixing, thawings, homogenizing, butane gas inject, mix homogenizing, extrusion, cooling and shaping, sizing sectility, into
The processes such as product, obtain biodegradable foam plastic product.
Embodiment three
9250g cornstarch is put into the stirred autoclave for filling 20000g deionized waters, be stirring evenly and then adding into
750g butyl acrylates, then add catalyst ammonium ceric nitrate into stirred autoclave again, continue to stir, until reaction 2-3 is small
When.Reaction product is exported from stirred autoclave and is put into centrifuge and removes water, modified starch is produced, modified starch is put into
Dried in drier, dry water content to 16wt%.Then the modified starch of the water content is passed through into direct bleeder single screw rod
Extruder is granulated.Wherein extruder rotating speed 20r/min, draw ratio is 40, and temperature setting is 90 DEG C of feeding section, the first compression
115 DEG C of section, 115 DEG C of the first homogenizing zone, 100 DEG C of exhaust section, 120 DEG C of the second compression section, 110 DEG C of the second homogenizing zone.
Gained pellet is put into drier, it is 55 DEG C to set drying temperature, dries 12 hours, obtains grain one.
Poly-succinic acid-butanediol is put into drier, drying temperature is 90 DEG C, dries 10 hours, obtains grain two.
Take the grain two of the parts by weight of grain one and 45 of 55 parts by weight is well mixed to be put into foaming machine (what the present embodiment selected is precious
Pearl cotton foaming machine, wherein extruder screw draw ratio are 55, and screw speed is 5-50r/min, heating-up temperature be set to 90 DEG C,
110 DEG C, 130 DEG C, 130 DEG C, 120 DEG C, foaming agent is butane) hopper, at the same time, take the maleic anhydride and 0.2 of 1.5 parts by weight
Be uniformly added into extruder in proportion after the benzoyl peroxide mixing of parts by weight, above-mentioned material rotated in an extruder with screw rod and
Heating devices heat, after batch mixing, thawing, homogenizing, butane gas injection, mixing homogenizing, extrusion, cooling and shaping, sizing sectility,
The processes such as finished product, obtain biodegradable foam plastic product.
Example IV
7300g cornstarch is put into the stirred autoclave for filling 20000g deionized waters, be stirring evenly and then adding into
2700g butyl acrylates, then add catalyst ammonium ceric nitrate into stirred autoclave again, continue to stir, until reaction 2-3 is small
When.Reaction product is exported from stirred autoclave and is put into centrifuge and removes water, modified starch is produced, modified starch is put into
Dried in drier, dry water content to 30wt%.Then the modified starch of the water content is passed through into direct bleeder single screw rod
Extruder is granulated.Wherein extruder rotating speed 20r/min, draw ratio is 40, and temperature setting is 90 DEG C of feeding section, the first compression
115 DEG C of section, 115 DEG C of the first homogenizing zone, 100 DEG C of exhaust section, 120 DEG C of the second compression section, 110 DEG C of the second homogenizing zone.
Gained pellet is put into drier, it is 60 DEG C to set drying temperature, dries 24 hours, obtains grain one.
Poly-succinic acid-butanediol is put into drier, drying temperature is 70 DEG C, dries 15 hours, obtains grain two.
Take the grain two of the parts by weight of grain one and 10 of 90 parts by weight is well mixed to be put into foaming machine (what the present embodiment selected is precious
Pearl cotton foaming machine, wherein extruder screw draw ratio are 55, and screw speed is 5-50r/min, heating-up temperature be set to 90 DEG C,
110 DEG C, 130 DEG C, 130 DEG C, 120 DEG C, foaming agent is butane) hopper, at the same time, take the maleic anhydride and 0.5 weight of 3 parts by weight
Extruder is uniformly added into after the benzoyl peroxide mixing of amount part in proportion, above-mentioned material is rotated and added with screw rod in an extruder
Thermal heat, after batch mixing, thawings, homogenizing, butane gas inject, mix homogenizing, extrusion, cooling and shaping, sizing sectility, into
The processes such as product, obtain biodegradable foam plastic product.
Embodiment five
The present embodiment produces microcellular foam by continuous extrusion method, and foaming agent is carbon dioxide.
8000g cornstarch is put into the stirred autoclave for filling 20000g deionized waters, be stirring evenly and then adding into
2000g butyl acrylates, then add catalyst ammonium ceric nitrate into stirred autoclave again, continue to stir, until reaction 2-3 is small
When.Reaction product is exported from stirred autoclave and is put into centrifuge and removes water, modified starch is produced, modified starch is put into
Dried in drier, dry water content 25wt%.Then the modified starch of the water content is squeezed by direct bleeder single screw rod
Go out machine to be granulated.Wherein extruder rotating speed 20r/min, draw ratio is 40, and temperature setting is 90 DEG C of feeding section, the first compression section
115 DEG C, 115 DEG C of the first homogenizing zone, 100 DEG C of exhaust section, 120 DEG C of the second compression section, 110 DEG C of the second homogenizing zone.
Gained pellet is put into drier, it is 60 DEG C to set drying temperature, dries 10 hours, obtains grain one.
Poly-succinic acid-butanediol is put into drier, drying temperature is 90 DEG C, dries 10 hours, obtains grain two.
Extruder is the extruder for being exclusively used in microporous foam, compared with conventional extruder, spiral shell intracavitary, and the connection of screw rod rear portion is quiet
State blender, static mixer connection Quick Depressurization nozzle.Specifically foaming process is：Take the parts by weight of grain one and 30 of 70 parts by weight
Grain two it is well mixed be put into extruder hopper, at the same time, take the maleic anhydride of 2 parts by weight and the peroxidating of 0.5 parts by weight
Extruder hopper is uniformly added into after benzoyl mixing in proportion, added material is rotated and heating devices heat because of screw rod, after mixed
Material, thawing, homogenizing, supercritical carbon dioxide injection, carbon dioxide mix homogenizing, batch mixing with fused materials in static mixer
Shaped device is entered by Quick Depressurization nozzle, most foam plastic product of degrading is obtained through shaping equipment afterwards.
Embodiment six
9000g cornstarch is put into the stirred autoclave for filling 20000g deionized waters, be stirring evenly and then adding into
1000g butyl acrylates, then add catalyst ammonium ceric nitrate into stirred autoclave again, continue to stir, until reaction 2-3 is small
When.Reaction product is exported from stirred autoclave and is put into centrifuge and removes water, modified starch is produced, modified starch is put into
Dried in drier, dry water content to 20wt%.Then the modified starch of the water content is carried out by single screw extrusion machine
Granulation.Wherein extruder rotating speed 20r/min, draw ratio is 40, and extruder heating, which is set, closes, and extruder operating temperature is normal
Temperature.
Gained pellet is put into drier, it is 60 DEG C to set drying temperature, dries 8 hours, obtains grain one.
Poly-succinic acid-butanediol is put into drier, drying temperature is 80 DEG C, dries 12 hours, obtains grain two.
Take the grain two of the parts by weight of grain one and 40 of 60 parts by weight is well mixed to be put into foaming machine (what the present embodiment selected is precious
Pearl cotton foaming machine, wherein extruder screw draw ratio are 55, and screw speed is 5-50r/min, heating-up temperature be set to 90 DEG C,
110 DEG C, 130 DEG C, 130 DEG C, 120 DEG C, foaming agent is butane) hopper, at the same time, take the maleic anhydride and 0.1 weight of 1 parts by weight
Extruder is uniformly added into after the benzoyl peroxide mixing of amount part in proportion, above-mentioned material is rotated and added with screw rod in an extruder
Thermal heat, after batch mixing, thawings, homogenizing, butane gas inject, mix homogenizing, extrusion, cooling and shaping, sizing sectility, into
The processes such as product, obtain biodegradable foam plastic product.
Embodiment seven
Repeat above-described embodiment, and by poly terephthalic acid-adipic acid-butanediol, poly-succinic-adipic acid-butanediol,
Poly terephthalic acid-succinic acid-butanediol or its combination substitute poly-succinic acid-butanediol, can be made and changed by same method
Property starch and poly terephthalic acid-adipic acid-butanediol, poly-succinic-butanediol, poly-succinic-adipic acid-butanediol, poly-
The compound biodegradable foamed plastic of terephthalic acid (TPA)-succinic acid-butanediol.
According to the method involved in the present invention that biodegradable foamed plastic is produced with modified starch, foam can be produced
The foamed materials such as sheet material, sheet material and foam-filled grain.
Claims (10)
1. a kind of method for producing biodegradable foamed plastic, it is characterised in that have following steps composition：
A. starch and butyl acrylate are subjected to graft copolymerization, modified starch is made, butyl acrylate content is not more than
30wt%；
B. the water content of modified starch is adjusted, it is 15-30wt% to make moisture；
C. the modified starch that step B is obtained is granulated；
D. pellet drying step C obtained to water content is no more than 3wt%, obtains grain one；
E. choose fully biodegradable resin granular material and processing is dried, obtain grain two；
F. grain one and grain two are mixed in proportion in addition extruder and carries out physical blowing, obtain biodegradable foaming modeling
Material.
2. according to the method described in claim 1, wherein in the step A, the weight of the butyl acrylate added during starch conversion
Amount is than being 7--20wt%.
3. according to the method described in claim 1, wherein in the step C, comminutor die temperature is no more than 60 DEG C.
4. according to the method described in claim 1, wherein in the step D, drying temperature is no more than 60 DEG C.
5. according to the method described in claim 1, wherein in the step E, the fully biodegradable resin is to be poly- to benzene
Dioctyl phthalate-adipic acid-butanediol, poly-succinic-butanediol, poly-succinic-adipic acid-butanediol, poly terephthalic acid-fourth two
One or more of combinations in acid-butanediol.
6. according to the method described in claim 1, wherein in the step F, percentage by weight shared by grain two is 10--50wt%.
7. method according to claim 6, wherein in the step F, percentage by weight 30--40wt% shared by grain two.
8. according to the method described in claim 1, wherein in the step F, while grain one, grain two are added into extruder,
Also maleic anhydride and benzoyl peroxide are proportionally added into extruder.
9. percentage by weight shared by method according to claim 8, wherein maleic anhydride is 1-3%, benzoyl peroxide
Shared percentage by weight is 0.1-0.5%.
10. according to the method described in claim 1, wherein in the step F, physical blowing agent is nitrogen or carbon dioxide.
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| CN201710328940.7A CN107083006A (en) | 2017-05-11 | 2017-05-11 | A kind of method for producing biodegradable foamed plastic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023237975A1 (en) * | 2022-06-10 | 2023-12-14 | Pinehurst Associates Limited | Biodegradable composition and methods for manufacture |
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| CN106046430A (en) * | 2016-06-30 | 2016-10-26 | 山东师范大学 | Completely biodegradable composite material |
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2017
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