CN115028977A - Blending modified sheet material prepared from natural biobased material and biodegradable raw material - Google Patents
Blending modified sheet material prepared from natural biobased material and biodegradable raw material Download PDFInfo
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Images
Classifications
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The invention discloses a modified sheet material prepared by blending natural bio-based materials and biodegradable raw materials, which comprises the following components in percentage by weight: PHA, bio-based filler, dispersant, plasticizer, interfacial agent and toughening agent, wherein the components are as follows by weight: 55-90 parts of PHA, 10-45 parts of bio-based filler, 1-2 parts of dispersant, 2-4 parts of plasticizer, 1-3 parts of interfacial agent and 3-5 parts of toughening agent; the processing technology comprises the following steps: step one, grinding; step two, dehumidifying; step three, drying; step four, high mixing; step five, extruding; step six, casting the sheet; step seven, calendering; step eight, trimming; step nine, coiling; step ten, finishing the product; in the invention, the used PHA and coconut shell materials are polar biological materials, have good biocompatibility after being processed outside, are natural components, are beneficial to environmental protection and are convenient to degrade, and the used dispersing agent, plasticizing agent, interfacial agent and toughening agent are all bio-based additives and have high bio-based degradability.
Description
Technical Field
The invention relates to the technical field of modified materials, in particular to a modified sheet material prepared by blending natural bio-based materials and biodegradable raw materials.
Background
The modified material has wide application, and can be practically applied in the industries of household appliances, automobiles, electronics, communication and the like, and good economic and social benefits are obtained, but the existing modified material is not easy to degrade, so that the environmental pollution is increased, and meanwhile, the treatment cost is increased when the modified material is treated, so that the design of the modified sheet material prepared by blending the natural bio-based material and the biodegradable raw materials is necessary.
Disclosure of Invention
The invention aims to provide a modified sheet material prepared by blending natural bio-based materials and biodegradable raw materials, which solves the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a modified sheet material prepared by blending natural bio-based materials and biodegradable raw materials comprises the following components in percentage by weight: PHA, bio-based filler, dispersant, plasticizer, interfacial agent and toughening agent, wherein the components are as follows by weight: 55-90 parts of PHA, 10-45 parts of bio-based filler, 1-2 parts of dispersant, 2-4 parts of plasticizer, 1-3 parts of interfacial agent and 3-5 parts of toughening agent.
Preferably, the bio-based filler is not limited to coconut shell powder, but also comprises bamboo, wood, tea, straw, coffee grounds, grain fiber powder, biological calcium, natural shell, egg, oyster shell and animal bone powder, and the PHA is selected from one or two of Polyhydroxybutyrate (PHB), hydroxyvalerate (PHBV) and hydroxybutyrate hexanoate copolyester, wherein the PBAT is a copolymer of butanediol succinate and butanediol terephthalate.
Preferably, the dispersant is one of EBs, N' -ethylene bis stearamide, calcium stearate and zinc.
Preferably, the plasticizer is one of epoxidized soybean oil ECo and polyester polyol.
Preferably, the interfacial agent is a glycerin fatty acid ester.
Preferably, the toughening agent is one of maleic anhydride natural rubber and Tpee polyether ester elastomer.
A processing technology for blending modified sheet material by utilizing natural bio-based and biodegradable raw materials comprises the following steps: step one, grinding; step two, dehumidifying; step three, drying; step four, high mixing; step five, extruding; step six, casting the sheet; step seven, calendering; step eight, trimming; step nine, coiling; step ten, obtaining a finished product;
in the first step, coconut shell powder is selected as the bio-based filler, and the selected coconut shell is firstly ground into powder to obtain the coconut shell powder;
in the second step, the coconut shell powder is subjected to the rotation speed regulation of a temperature-adjustable high-speed stirrer for 800-1500r/min, the temperature is increased to 85-100 ℃ for 30 minutes to remove water until the water content reaches 2-3 percent, and then the dry-based coconut shell powder is obtained;
in the third step, the PHA raw material is pre-dried, the humidity is set to be minus 40 ℃, the PHA raw material is dried for 3 hours at the temperature of 65 ℃, and the water content of the raw material is 45-50 ppm;
in the fourth step, 10-45 parts of dry coconut shell powder obtained in the second step and 1-3 parts of interface agent are poured into the first step for coupling treatment for 25 minutes, 55-90 parts of PHA raw material, 1-2 parts of dispersing agent, 2-4 parts of plasticizer and 3-5 parts of toughening agent are added into the second step for stirring for 15 minutes,
in the fifth step, all the uniformly mixed material is put into a low-speed cold mixing barrel, cooled to 45 ℃ and then discharged and put into a parallel double-screw extruder; aims at removing the residual water and ash, the screw rotating speed of 180-;
in the sixth step, a semi-finished sheet is obtained by a T-shaped die head and three-roller cast sheet cooling; the upper roll temperature in the three-roll temperature is 65 ℃, the middle roll temperature is 68 ℃ and the lower roll temperature is 45 ℃, meanwhile, the diameter of the upper roll is 40cm, the diameter of the middle roll is 50cm, the diameter of the lower roll is 50cm, and meanwhile, the die head temperature of the T-shaped die head is 195 plus 200 ℃;
in the seventh step, the semi-finished sheet obtained in the sixth step is subjected to calendaring treatment;
in the eighth step, the semi-finished product sheet obtained in the seventh step is subjected to edge cutting treatment;
in the ninth step, the semi-finished sheet trimmed in the eighth step is coiled according to the required specification;
and in the tenth step, packaging the semi-finished sheet rolled in the ninth step to obtain the finished product blending modified sheet.
Preferably, in the fifth step, the extruder heating zone is eight zones: wherein the temperature of the zone 1 is 60-80C, the temperature of the zone 2 is 80-130C, the temperature of the zone 3 is 130-150C, the temperature of the zone 4 is 150-170C, the temperature of the zone 5 is 170-180C, the temperature of the zone 6 is 180-190C, the temperature of the zone 7 is 190-195C, and the temperature of the zone 8 is 195C.
Compared with the prior art, the invention has the beneficial effects that: in the invention, the used PHA and coconut shell materials are polar biological materials, have good biocompatibility after being externally treated, contain natural components and do not contain harmful substances, and the environment can not generate harmful gas after high-temperature combustion, and the coconut shell (slag and crushed) is easy to obtain, cheap and recycled for zero discharge, can be quickly degraded under the condition of natural environment and further degraded into carbon dioxide and water along with the lapse of time, and finally returns to the nature, so that the land is more fertile; meanwhile, the coconut shell residue powder has strong hardness, high lignin content, cellulose content of more than 50 percent and polysaccharide content of 20 percent, has good blending property for cross-linked organisms and biodegradability, and PHA (polyhydroxyalkanoate) is fermented and synthesized by using glucose and fructose as carbon sources and can be used for synthesizing a new lactone biological material (without petroleum dependence) through bacteria, has high water vapor barrier property, transparency and flexibility, and can be biodegraded in seawater and shallow water.
Drawings
FIG. 1 is a process 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.
Referring to fig. 1, an embodiment of the present invention:
example 1:
a modified sheet material prepared by blending natural bio-based materials and biodegradable raw materials comprises the following components in percentage by weight: PHA, bio-based filler, dispersant, plasticizer, interfacial agent and toughening agent, wherein the components are as follows by weight: 90 parts of PHA, 10 parts of bio-based filler, 0.5 part of dispersant, 1 part of plasticizer, 1 part of interface agent and 1 part of toughening agent, wherein the bio-based filler is coconut shell powder, the dispersant is EBs (ethylene-bis-hydroxyethyl methacrylate), the plasticizer is polyester polyol, the interface agent is monoglyceride fatty acid ester, the toughening agent is Tpee polyether ester elastomer, and the PHA is Polyhydroxybutyrate (PHB).
A processing technology for blending a modified sheet material by utilizing natural bio-based materials and biodegradable raw materials comprises the following steps: step one, grinding; step two, dehumidifying; step three, drying; step four, high mixing; step five, extruding; step six, casting the sheet; step seven, calendering; step eight, trimming; step nine, coiling; step ten, finishing the product;
in the first step, coconut shell powder is selected as the bio-based filler, and the selected coconut shell is firstly ground into powder to obtain the coconut shell powder;
in the second step, the coconut shell powder is subjected to the rotation speed regulation of a temperature-adjustable high-speed stirrer for 800-1500r/min, the temperature is increased to 85-100 ℃ for 30 minutes to remove water until the water content reaches 2-3 percent, and then the dry-based coconut shell powder is obtained; and the dry-based coconut shell powder (the particle size is 40-75um) is 200-300 meshes;
in the third step, the PHA raw material is pre-dried, the humidity is set to be minus 40 ℃, the PHA raw material is dried for 3 hours at the temperature of 65 ℃, and the water content of the raw material is 45-50 ppm;
in the fourth step, 10 parts of dry coconut shell powder obtained in the second step and 1 part of interface agent are poured into the first step for coupling treatment for 25 minutes, 90 parts of PHA raw material, 0.5 part of dispersing agent, 1 part of plasticizer and 1 part of toughening agent are added into the second step for stirring for 15 minutes,
in the fifth step, all the uniformly mixed material is put into a low-speed cold mixing barrel, cooled to 45 ℃ and then discharged and put into a parallel double-screw extruder; aims at removing the residual moisture and ash, the screw rotation speed of 180-250R/min and the vacuumizing vacuum degree of a parallel double-screw extruder of-0.099 MPA; eight zones of the extruder are divided by heating: wherein the temperature of the zone 1 is 60-80C, the temperature of the zone 2 is 80-130C, the temperature of the zone 3 is 130-150C, the temperature of the zone 4 is 150-170C, the temperature of the zone 5 is 170-180C, the temperature of the zone 6 is 180-190C, the temperature of the zone 7 is 190-195C, and the temperature of the zone 8 is 195C;
in the sixth step, a semi-finished sheet is obtained by a T-shaped die head and three-roller cast sheet cooling; the upper roll temperature in the three-roll temperature is 65 ℃, the middle roll temperature is 68 ℃ and the lower roll temperature is 45 ℃, meanwhile, the diameter of the upper roll is 40cm, the diameter of the middle roll is 50cm, the diameter of the lower roll is 50cm, and meanwhile, the die head temperature of the T-shaped die head is 195 plus 200 ℃;
in the seventh step, the semi-finished sheet obtained in the sixth step is subjected to calendaring treatment;
in the eighth step, the semi-finished product sheet obtained in the seventh step is subjected to edge cutting treatment;
in the ninth step, the semi-finished sheet trimmed in the eighth step is coiled according to the required specification;
and in the tenth step, packaging the semi-finished sheet rolled in the ninth step to obtain the finished product blending modified sheet.
Example 2:
a modified sheet material prepared by blending natural bio-based materials and biodegradable raw materials comprises the following components in percentage by weight: PHA, bio-based filler, dispersant, plasticizer, interfacial agent and toughening agent, wherein the components are as follows by weight: 75 parts of PHA, 25 parts of bio-based filler, 1 part of dispersant, 1.8 parts of plasticizer, 1.5 parts of interfacial agent and 2.5 parts of toughening agent, wherein the bio-based filler is coconut shell powder, the dispersant is Ebs, the plasticizer is polyester polyol, the interfacial agent is monoglyceride, the toughening agent is Tpee polyether ester elastomer, and the PHA is Polyhydroxybutyrate (PHB).
A processing technology for blending modified sheet material by utilizing natural bio-based and biodegradable raw materials comprises the following steps: step one, grinding; step two, dehumidifying; step three, drying; step four, high mixing; step five, extruding; step six, casting the sheet; step seven, calendering; step eight, trimming; step nine, coiling; step ten, finishing the product;
in the first step, coconut shell powder is selected as the bio-based filler, and the selected coconut shell is firstly ground into powder to obtain the coconut shell powder;
in the second step, the coconut shell powder is subjected to the rotation speed regulation of a temperature-adjustable high-speed stirrer for 800-1500r/min, the temperature is increased to 85-100 ℃ for 30 minutes to remove water until the water content reaches 2-3 percent, and then the dry-based coconut shell powder is obtained; and the dry-based coconut shell powder (with the particle size of 40-75um) is 200-300 meshes;
in the third step, the PHA raw material is pre-dried, the humidity is set to be minus 40 ℃, the PHA raw material is dried for 3 hours at the temperature of 65 ℃, and the water content of the raw material is 45-50 ppm;
in the fourth step, 25 parts of dry coconut shell powder obtained in the second step and 1.5 parts of interface agent are poured into the first step for coupling treatment for 25 minutes, 75 parts of PHA raw material, 1 part of dispersing agent, 1.8 parts of plasticizing agent and 2.5 parts of toughening agent are added into the second step for stirring for 15 minutes,
in the fifth step, all the uniformly mixed material is put into a low-speed cold mixing barrel, cooled to 45 ℃ and then discharged and put into a parallel double-screw extruder; aims at removing the residual moisture and ash, the screw rotation speed of 180-250R/min and the vacuumizing vacuum degree of a parallel double-screw extruder of-0.099 MPA; eight zones of the extruder are divided by heating: wherein the temperature of the zone 1 is 60-80C, the temperature of the zone 2 is 80-130C, the temperature of the zone 3 is 130-150C, the temperature of the zone 4 is 150-170C, the temperature of the zone 5 is 170-180C, the temperature of the zone 6 is 180-190C, the temperature of the zone 7 is 190-195C, and the temperature of the zone 8 is 195C;
in the sixth step, a semi-finished sheet is obtained by a T-shaped die head and three-roller cast sheet cooling; the upper roll temperature in the three-roll temperature is 65 ℃, the middle roll temperature is 68 ℃ and the lower roll temperature is 45 ℃, meanwhile, the diameter of the upper roll is 40cm, the diameter of the middle roll is 50cm, the diameter of the lower roll is 50cm, and meanwhile, the die head temperature of the T-shaped die head is 195 plus 200 ℃;
in the seventh step, the semi-finished sheet obtained in the sixth step is subjected to calendaring treatment;
in the eighth step, the semi-finished product sheet obtained in the seventh step is subjected to edge cutting treatment;
in the ninth step, the semi-finished sheet trimmed in the eighth step is coiled according to the required specification;
and in the tenth step, packaging the semi-finished sheet rolled in the ninth step to obtain the finished product blending modified sheet.
Example 3:
a modified sheet material blended by natural bio-based and biodegradable raw materials comprises the following components: PHA, bio-based filler, dispersant, plasticizer, interfacial agent and toughening agent, wherein the components are as follows by weight: 65 parts of PHA, 35 parts of bio-based filler, 1 part of dispersant, 2.5 parts of plasticizer, 2 parts of interface agent and 3 parts of toughening agent, wherein the bio-based filler is coconut shell powder, the dispersant is Ebs, the plasticizer is polyester polyol, the interface agent is monoglyceride fatty acid ester, the toughening agent is Tpee polyether ester elastomer, and the PHA is Polyhydroxybutyrate (PHB).
A processing technology for blending modified sheet material by utilizing natural bio-based and biodegradable raw materials comprises the following steps: step one, grinding; step two, dehumidifying; step three, drying; step four, high mixing; step five, extruding; step six, casting the sheet; step seven, calendering; step eight, trimming; step nine, coiling; step ten, finishing the product;
in the first step, coconut shell powder is selected as the bio-based filler, and the selected coconut shell is firstly ground into powder to obtain the coconut shell powder;
in the second step, the coconut shell powder is heated for 30 minutes by the temperature-adjustable high-speed stirrer with the rotation speed of 800-1500r/min until the water content reaches 2-3 percent, thus obtaining the dry-based coconut shell powder; and the dry-based coconut shell powder (with the particle size of 40-75um) is 200-300 meshes;
in the third step, the PHA raw material is pre-dried, the dew point is set to be minus 40 at the humidity, the PHA raw material is dried for 3 hours at the temperature of 65 ℃, and the water content of the raw material is 45-50 ppm;
in the fourth step, firstly, 35 parts of dry coconut shell powder obtained in the second step and 2 parts of an interface agent are poured into the mixer for coupling treatment for 25 minutes, secondly, 65 parts of PHA raw material, 1 part of dispersing agent, 2.5 parts of plasticizing agent and 3 parts of toughening agent are added into the mixer for further stirring for 15 minutes,
in the fifth step, all the uniformly mixed material is put into a low-speed cold mixing barrel, cooled to 45 ℃ and then discharged and put into a parallel double-screw extruder; aims at removing the residual water and ash, the screw rotating speed of 180-; eight zones of the extruder are divided by heating: wherein the temperature of the zone 1 is 60-80C, the temperature of the zone 2 is 80-130C, the temperature of the zone 3 is 130-150C, the temperature of the zone 4 is 150-170C, the temperature of the zone 5 is 170-180C, the temperature of the zone 6 is 180-190C, the temperature of the zone 7 is 190-195C, and the temperature of the zone 8 is 195C;
in the sixth step, the semi-finished product sheet is obtained through T-shaped die head and three-roller cast sheet cooling; the upper roll temperature in the three-roll temperature is 65 ℃, the middle roll temperature is 68 ℃ and the lower roll temperature is 45 ℃, meanwhile, the diameter of the upper roll is 40cm, the diameter of the middle roll is 50cm, the diameter of the lower roll is 50cm, and meanwhile, the die head temperature of the T-shaped die head is 195-200 ℃;
in the seventh step, the semi-finished sheet obtained in the sixth step is subjected to calendaring treatment;
in the eighth step, the semi-finished product sheet obtained in the seventh step is subjected to edge cutting treatment;
in the ninth step, the semi-finished sheet trimmed in the eighth step is coiled according to the required specification;
and in the tenth step, packaging the semi-finished sheet rolled in the ninth step to obtain the finished product blending modified sheet.
Example 4:
a modified sheet material prepared by blending natural bio-based materials and biodegradable raw materials comprises the following components in percentage by weight: PHA, bio-based filler, dispersant, plasticizer, interfacial agent and toughening agent, wherein the components are as follows by weight: 55 parts of PHA, 45 parts of bio-based filler, 1 part of dispersant, 3.5 parts of plasticizer, 2 parts of interface agent and 4 parts of toughening agent, wherein the bio-based filler is coconut shell powder, the dispersant is Ebs, the plasticizer is polyester polyol, the interface agent is monoglyceride fatty acid ester, the toughening agent is Tpee polyether ester elastomer, and the PHA is Polyhydroxybutyrate (PHB).
A processing technology for blending modified sheet material by utilizing natural bio-based and biodegradable raw materials comprises the following steps: step one, grinding; step two, dehumidifying; step three, drying; step four, high mixing; step five, extruding; step six, casting the sheet; step seven, calendering; step eight, trimming; step nine, coiling; step ten, obtaining a finished product;
in the first step, coconut shell powder is selected as the bio-based filler, and the selected coconut shell is firstly ground into powder to obtain the coconut shell powder;
in the second step, the coconut shell powder is subjected to the rotation speed regulation of a temperature-adjustable high-speed stirrer for 800-1500r/min, the temperature is increased to 85-100 ℃ for 30 minutes to remove water until the water content reaches 2-3 percent, and then the dry-based coconut shell powder is obtained; and the dry-based coconut shell powder (with the particle size of 40-75um) is 200-300 meshes;
in the third step, the PHA raw material is pre-dried, the humidity is set to be minus 40 ℃, the PHA raw material is dried for 3 hours at the temperature of 65 ℃, and the water content of the raw material is 45-50 ppm;
in the fourth step, 45 parts of dry coconut shell powder obtained in the second step and 2 parts of an interface agent are poured into the first step for coupling treatment for 25 minutes, 55 parts of PHA raw material, 1 part of dispersing agent, 3.5 parts of plasticizer and 4 parts of toughening agent are added into the second step for stirring for 15 minutes,
in the fifth step, all the uniformly mixed material is put into a low-speed cold mixing barrel, cooled to 45 ℃ and then discharged and put into a parallel double-screw extruder; aims at removing the residual water and ash, the screw rotating speed of 180-; eight zones of the extruder are divided by heating: wherein the temperature of the zone 1 is 60-80C, the temperature of the zone 2 is 80-130C, the temperature of the zone 3 is 130-150C, the temperature of the zone 4 is 150-170C, the temperature of the zone 5 is 170-180C, the temperature of the zone 6 is 180-190C, the temperature of the zone 7 is 190-195C, and the temperature of the zone 8 is 195C;
in the sixth step, a semi-finished sheet is obtained by a T-shaped die head and three-roller cast sheet cooling; the upper roll temperature in the three-roll temperature is 65 ℃, the middle roll temperature is 68 ℃ and the lower roll temperature is 45 ℃, meanwhile, the diameter of the upper roll is 40cm, the diameter of the middle roll is 50cm, the diameter of the lower roll is 50cm, and meanwhile, the die head temperature of the T-shaped die head is 195 plus 200 ℃;
in the seventh step, the semi-finished sheet obtained in the sixth step is subjected to calendaring treatment;
in the eighth step, the semi-finished product sheet obtained in the seventh step is subjected to edge cutting treatment;
in the ninth step, the semi-finished sheet trimmed in the eighth step is coiled according to the required specification;
and step ten, packaging the semi-finished sheet coiled in the step nine to obtain the finished product blending modified sheet.
To verify that the blending process of the present invention resulted in a beneficial sheet, the following comparative experiments were performed: under the condition of equal mass ratio of inorganic calcium carbonate and organic coconut shell powder, the difference of mechanics and specific gravity is as follows:
the distinction between inorganic and organic filling:
| inorganic/organic | Common inorganic filler | Coconut shell powder |
| Biobased content pmc | Is free of | 98％ |
| Biodegradability | Is free of | 99％ |
| Degree of stacking | 0.8-1.3g/cm 3 | 0.4-0.6/cm 3 |
Physical property comparison of PHA and different coconut shell powders in different proportions
Based on the above, the invention has the advantages that the PHA and the coconut shell both belong to polar biological materials, have good biocompatibility after being processed outside, contain natural components, do not contain harmful substances, and can not generate harmful gas in the environment after high-temperature combustion; meanwhile, the coconut shells (slag and broken) are easy to obtain, cheap to recycle and zero-emission, can be quickly degraded under natural environment conditions and further degraded into carbon dioxide and water (the coconut shells can be degraded in 3-6 months in soil) and finally return to nature; the land is more fertile; after the PHA/coconut shell powder is blended, the relative degradation rate of 93 percent in 120 days is tested through GDT/19277.1-2011 degradation, and the biobased content of the blended PHA/coconut shell powder is more than 90 percent and is certified through USDA (Universal Serial bus) certification ASTMD 6866; the biodegradable material does not increase environmental load, belongs to green source environment-friendly material, and is convenient for environmental protection.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. A modified sheet material prepared by blending natural bio-based materials and biodegradable raw materials comprises the following components in percentage by weight: PHA, bio-based filler, dispersant, plasticizer, interfacial agent and toughening agent, and is characterized in that: the weight parts of each component are respectively as follows: 55-90 parts of PHA, 10-45 parts of bio-based filler, 1-2 parts of dispersant, 2-4 parts of plasticizer, 1-3 parts of interfacial agent and 3-5 parts of toughening agent.
2. The sheet material modified by blending natural biobased material and biodegradable material according to claim 1, wherein: the bio-based filler is not limited to coconut shell powder, but also comprises bamboo, wood, tea, straw, coffee grounds, grain fiber powder, biological calcium, natural shells, eggs, oyster shells and animal bone powder, and the PHA is selected from one or two of Polyhydroxybutyrate (PHB), hydroxyvalerate (PHBV) and hydroxybutyrate hexanoate copolyester, wherein the PBAT is a copolymer of butanediol diacid and butanediol terephthalate.
3. The sheet material modified by blending natural biobased material and biodegradable material as claimed in claim 1, wherein: the dispersing agent is one of EBs, N' -ethylene bis stearamide, calcium stearate and zinc.
4. The sheet material modified by blending natural biobased material and biodegradable material according to claim 1, wherein: the plasticizer is one of epoxidized soybean oil ECo and polyester polyol.
5. The sheet material modified by blending natural biobased material and biodegradable material according to claim 1, wherein: the interfacial agent is glycerin fatty acid ester.
6. The sheet material modified by blending natural biobased material and biodegradable material according to claim 1, wherein: the toughening agent is one of maleic anhydride natural rubber and Tpee polyether ester elastomer.
7. A processing technology for blending modified sheet material by utilizing natural bio-based and biodegradable raw materials comprises the following steps: step one, grinding; step two, dehumidifying; step three, drying; step four, high mixing; step five, extruding; step six, casting the sheet; step seven, calendering; step eight, trimming; step nine, coiling; step ten, finishing the product; the method is characterized in that:
in the first step, coconut shell powder is selected as the bio-based filler, and the selected coconut shell is firstly ground into powder to obtain the coconut shell powder;
in the second step, the coconut shell powder is subjected to the rotation speed regulation of a temperature-adjustable high-speed stirrer for 800-1500r/min, the temperature is increased to 85-100 ℃ for 30 minutes to remove water until the water content reaches 2-3 percent, and then the dry-based coconut shell powder is obtained;
in the third step, the PHA raw material is pre-dried, the humidity is set to be minus 40 ℃, the PHA raw material is dried for 3 hours at the temperature of 65 ℃, and the water content of the raw material is 45-50 ppm;
in the fourth step, 10-45 parts of dry coconut shell powder obtained in the second step and 1-3 parts of interface agent are poured into the mixer for coupling treatment for 25 minutes in the first step, 55-90 parts of PHA raw material, 1-2 parts of dispersing agent, 2-4 parts of plasticizer and 3-5 parts of toughening agent are added into the mixer for further stirring for 15 minutes in the second step,
in the fifth step, all the uniformly mixed material is put into a low-speed cold mixing barrel, cooled to 45 ℃ and then discharged and put into a parallel double-screw extruder; aims at removing the residual water and ash, the screw rotating speed of 180-;
in the sixth step, a semi-finished sheet is obtained by a T-shaped die head and three-roller cast sheet cooling; the upper roll temperature in the three-roll temperature is 65 ℃, the middle roll temperature is 68 ℃ and the lower roll temperature is 45 ℃, meanwhile, the diameter of the upper roll is 40cm, the diameter of the middle roll is 50cm, the diameter of the lower roll is 50cm, and meanwhile, the die head temperature of the T-shaped die head is 195 plus 200 ℃;
in the seventh step, the semi-finished sheet obtained in the sixth step is subjected to calendaring treatment;
in the eighth step, the semi-finished sheet obtained in the seventh step is subjected to edge cutting treatment;
in the ninth step, the semi-finished sheet trimmed in the eighth step is coiled according to the required specification;
and in the tenth step, packaging the semi-finished sheet rolled in the ninth step to obtain the finished product blending modified sheet.
8. The processing technology of the sheet material modified by blending natural bio-based material and biodegradable material as claimed in claim 7, wherein: in the fifth step, the extruder is heated to distinguish eight zones: wherein the temperature of the zone 1 is 60-80C, the temperature of the zone 2 is 80-130C, the temperature of the zone 3 is 130-150C, the temperature of the zone 4 is 150-170C, the temperature of the zone 5 is 170-180C, the temperature of the zone 6 is 180-190C, the temperature of the zone 7 is 190-195C, and the temperature of the zone 8 is 195C.
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