CN114426764A - Flame-retardant environment-friendly packaging film and preparation method thereof - Google Patents
Flame-retardant environment-friendly packaging film and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2403/04—Starch derivatives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/322—Ammonium phosphate
- C08K2003/323—Ammonium polyphosphate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/11—Esters; Ether-esters of acyclic polycarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/521—Esters of phosphoric acids, e.g. of H3PO4
Abstract
The invention relates to a flame-retardant environment-friendly packaging film and a preparation method thereof, belonging to the technical field of environment-friendly plastics, wherein the packaging film comprises the following raw materials in parts by weight: 120 parts of bio-based composite material, 0.1-0.2 part of lubricant, 8-9 parts of auxiliary agent, 7-9 parts of modified starch, 7-9 parts of flame retardant and 1-2 parts of stabilizer; the preparation method comprises the following steps: mixing the bio-based composite material, the lubricant, the modified starch, the flame retardant and the stabilizer in parts by weight; adding the mixed raw materials into a double-screw extruder, adding an auxiliary agent, extruding and granulating, drying granules to obtain a resin material, and performing blow molding on the obtained resin material to form a film. By adding the self-made auxiliary agent, the toughness of the film is improved, and the degradation effect is not influenced. In addition, starch is modified by the modifier, so that hydrophobicity is improved, the modified starch can also improve the mixing effect of the flame retardant and the matrix, and the improvement of the mechanical property of the product is promoted.
Description
Technical Field
The invention belongs to the technical field of environment-friendly plastics, and particularly relates to a flame-retardant environment-friendly packaging film and a preparation method thereof.
Background
The plastic has the advantages of small density, high strength, corrosion resistance, no toxicity, excellent dielectric property, good chemical stability, corrosion resistance, low price, easy molding and processing and the like, is widely applied to industries such as chemical industry, food, medicine and the like, and along with the development of the take-out and express industries, a large amount of waste can be generated by using plastic packages in a large amount, the plastic is not easy to decompose and recover, the ecological environment can be influenced by the pollution to soil, ocean and air, and the environment can be damaged by landfill, incineration and other treatments.
Various degradable plastics continuously appear, and the degradable plastics can be decomposed by oneself under the effect of biological environment, no matter be harmless to people or environment, belong to environment-friendly green packaging material.
The starch-based degradable plastic in the existing scheme mainly has the following defects: the mechanical property still has defects, the heat resistance is poor, and the repeated processing can not be carried out; the processing method is complex, the processing temperature range is narrow, and the processing method is extremely sensitive to temperature; poor water resistance, leading to even less weatherability; due to the defects of the traditional starch-based degradable plastic, the large-scale popularization and application of the plastic are limited.
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides a flame-retardant environment-friendly packaging film and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
the flame-retardant environment-friendly packaging film comprises the following raw materials in parts by weight:
120 parts of bio-based composite material, 0.1-0.2 part of lubricant, 8-9 parts of auxiliary agent, 7-9 parts of modified starch, 7-9 parts of flame retardant and 1-2 parts of stabilizer;
a preparation method of a flame-retardant environment-friendly packaging film comprises the following steps:
mixing 120 parts of bio-based composite material, 0.1-0.2 part of lubricant, 7-9 parts of modified starch, 7-9 parts of flame retardant and 1-2 parts of stabilizer in parts by weight;
adding the mixed raw materials into a double-screw extruder, quantitatively adding an auxiliary agent into the side line of the extruder by using a peristaltic pump in the extrusion process, extruding and granulating, drying granules to obtain a resin material, and performing blow molding on the obtained resin material by using a film blowing machine to form a film, wherein the extrusion temperature is 140-170 ℃, the casting temperature is 45 ℃, the longitudinal stretching temperature is 90 ℃, the stretching ratio is 3.0, the transverse stretching temperature is 70 ℃, and the stretching ratio is 3.2.
The auxiliary agent is prepared by the following steps:
under the protection of nitrogen, mixing citric acid, an alcohol monomer and a polymerization inhibitor, stirring for 20min at 165 ℃, then cooling to 145 ℃, continuing to stir for 1h, then cooling to 50 ℃, adding phytic acid, continuing to stir for 30min, then heating to 140-150 ℃, continuing to stir for 2h, and obtaining the auxiliary agent. The assistant is prepared by crosslinking citric acid, alcohol monomer and phytic acid, belongs to a full-bio-based substance, is easy to degrade, the citric acid and the alcohol monomer are subjected to esterification reaction, the residual hydroxyl can react with the phytic acid after the citric acid is reacted, the phytic acid is a safe and reproducible substance with good compatibility and is easy to obtain, the phosphorus content of the phytic acid is up to 28 percent, and the prepared assistant has a dehydration effect and promotes charring.
The main body of the auxiliary agent is citrate substances, is not easy to volatilize, has strong migration resistance, is degradable, has good compatibility with polylactic acid, improves the blending effect of the polylactic acid and the PBAT, and is beneficial to improving the toughness of the film.
Further, the alcohol monomer is 1, 10-decanediol, the polymerization inhibitor is 2, 5-di-tert-butylhydroquinone, and the addition amount of the polymerization inhibitor is 3% of the molar weight of the citric acid.
Further, the molar ratio of carboxyl in citric acid to hydroxyl in alcohol monomer is 1: 2; the mass ratio of the citric acid to the phytic acid is 1: 0.2-0.3.
Further, the lubricant is one of polyethylene wax and magnesium stearate. Are all environment-friendly and nontoxic substances.
Further, the bio-based composite material consists of polylactic acid and PBAT, and the polylactic acid and the PBAT are prepared from polylactic acid and PBATThe weight ratio is 1: 4. the weight average molecular weight of the polylactic acid is 1.5 multiplied by 105g·mol-1. PBAT is a copolymer of butylene adipate and butylene terephthalate.
Further, the flame retardant is ammonium polyphosphate.
Further, the modified starch is prepared by the following steps:
step S11, mixing 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide with xylene, heating to 80 ℃, dropwise adding the mixed solution, carrying out reflux reaction for 24 hours after the addition is finished, cooling to room temperature after the reaction is finished, and then carrying out reduced pressure concentration to remove the solvent to obtain a modifier; 2-octenyl succinic anhydride is added into the modifier, and alkyl long chain is introduced, so that on one hand, the hydrophobic effect of the modified starch can be improved, and on the other hand, the alkyl long chain can be inserted between polymer chains, the acting force between macromolecules is weakened, and cross-linking points are destroyed, so that the polymer framework is extended, the flexibility of the molecular chains is increased, and the toughening effect is achieved.
And step S12, under the condition of nitrogen protection, mixing starch and pyridine, heating and refluxing for reaction for 4 hours, cooling to about 75 ℃, adding a modifier and 4-dimethylaminopyridine, heating and refluxing for reaction for 24 hours, cooling the reaction solution to about 25 ℃ after the reaction is finished, washing with absolute ethyl alcohol, and filtering and drying to obtain the modified starch. The modified starch is treated by phosphoric acid, is similar to phosphated starch, improves the compatibility among the starch, the flame retardant and a matrix, can improve the flame retardant effect by compounding the modified starch and the ammonium polyphosphate, can form a stable expanded carbon layer in a combustion experiment, realizes the purpose of flame retardance, and improves the thermal stability.
Further, the mixed solution in step S11 is 2-octenyl succinic anhydride and tetrahydrofuran in an amount of 1 g: 5mL, and the dosage ratio of the 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide to the mixed solution is 1 g: 5 mL;
in the step S12, the modifier needs to be dissolved in dimethyl sulfoxide and then added, and the dosage ratio of the starch, the pyridine, the modifier and the 4-dimethylaminopyridine is 2 g: 10mL of: 3 g: 0.4 g.
Further, the stabilizer is nano silicon dioxide and nano titanium dioxide according to the mass ratio of 1: 1 are mixed.
The invention has the beneficial effects that:
in the invention, the self-made auxiliary agent is added, so that the additive is not easy to volatilize, has strong migration resistance and is degradable, has good compatibility with polylactic acid, improves the blending effect of the polylactic acid and PBAT, is beneficial to improving the toughness of the film, and does not influence the degradation effect.
In addition, starch is a natural polysaccharide macromolecule which can be completely biodegraded, and has the advantages of wide source and reproducibility. The bio-based composite material prepared by blending starch and polylactic acid can reduce the cost of the polylactic acid composite material while maintaining the biodegradation characteristic, and can meet the application in more fields. Therefore, in the invention, the starch is modified by the modifier to improve the hydrophobicity, and the modified starch can also improve the mixing effect of the flame retardant and the matrix, thereby promoting the improvement of the mechanical property of the product.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Preparing modified starch:
step S11, mixing 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide with xylene, heating to 80 ℃, dropwise adding the mixed solution, carrying out reflux reaction for 24 hours after the addition is finished, cooling to room temperature after the reaction is finished, and then carrying out reduced pressure concentration to remove the solvent to obtain a modifier; the mixed solution is 2-octenyl succinic anhydride and tetrahydrofuran, and the weight ratio of the mixed solution is 1 g: 5mL, and the dosage ratio of the 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide to the mixed solution is 1 g: 5 mL;
and step S12, under the condition of nitrogen protection, mixing starch and pyridine, heating and refluxing for reaction for 4 hours, cooling to about 75 ℃, mixing a modifier and dimethyl sulfoxide, adding 4-dimethylaminopyridine, heating and refluxing for reaction for 24 hours, cooling the reaction solution to about 25 ℃ after the reaction is finished, washing with absolute ethyl alcohol, and filtering and drying to obtain the modified starch. The modifier needs to be dissolved in dimethyl sulfoxide and then added, and the dosage ratio of the starch, the pyridine, the modifier and the 4-dimethylaminopyridine is 2 g: 10mL of: 3 g: 0.4 g.
Example 2
Preparing an auxiliary agent:
under the protection of nitrogen, mixing citric acid, 1, 10-decanediol and 2, 5-di-tert-butylhydroquinone, stirring for 20min at 165 ℃, then cooling to 145 ℃, continuing to stir for 1h, then cooling to 50 ℃, adding phytic acid, continuing to stir for 30min, then heating to 140 ℃, and continuing to stir for 2h to obtain the auxiliary agent.
The addition amount of the 2, 5-di-tert-butylhydroquinone is 3 percent of the molar weight of the citric acid; the molar ratio of carboxyl in citric acid to hydroxyl in 1, 10-decanediol is 1: 2; the mass ratio of the citric acid to the phytic acid is 1: 0.2.
example 3
Preparing an auxiliary agent:
under the protection of nitrogen, mixing citric acid, 1, 10-decanediol and 2, 5-di-tert-butylhydroquinone, stirring for 20min at 165 ℃, then cooling to 145 ℃, continuing to stir for 1h, then cooling to 50 ℃, adding phytic acid, continuing to stir for 30min, then heating to 150 ℃, and continuing to stir for 2h to obtain the auxiliary agent.
The addition amount of the 2, 5-di-tert-butylhydroquinone is 3 percent of the molar weight of the citric acid; the molar ratio of carboxyl in citric acid to hydroxyl in 1, 10-decanediol is 1: 2; the mass ratio of the citric acid to the phytic acid is 1: 0.3.
example 4
A preparation method of a flame-retardant environment-friendly packaging film comprises the following steps:
mixing 120 parts by weight of bio-based composite material, 0.1 part by weight of lubricant, 7 parts by weight of modified starch prepared in example 1, 7 parts by weight of ammonium polyphosphate and 1 part by weight of polyethylene wax; adding the mixed raw materials into a double-screw extruder, quantitatively adding 8 parts of the auxiliary agent prepared in the example 2 into the side line of the extruder by using a peristaltic pump in the extrusion process, performing extrusion granulation, drying granules to obtain a resin material, and performing blow molding on the obtained resin material by using a film blowing machine to form a film, wherein the extrusion temperature is 140-170 ℃, the casting temperature is 45 ℃, the longitudinal stretching temperature is 90 ℃, the stretching ratio is 3.0, the transverse stretching temperature is 70 ℃, and the stretching ratio is 3.2.
The bio-based composite material comprises polylactic acid and PBAT, wherein the weight ratio of the polylactic acid to the PBAT is 1: 4. the weight average molecular weight of the polylactic acid is 1.5 multiplied by 105g·mol-1. PBAT is a copolymer of butylene adipate and butylene terephthalate. The stabilizer is nano silicon dioxide and nano titanium dioxide according to the mass ratio of 1: 1 are mixed.
Example 5
A preparation method of a flame-retardant environment-friendly packaging film comprises the following steps:
mixing 120 parts by weight of a bio-based composite material, 0.3 part by weight of polyethylene wax, 8 parts by weight of modified starch prepared in example 1, 8 parts by weight of ammonium polyphosphate and 2 parts by weight of a stabilizer; adding the mixed raw materials into a double-screw extruder, quantitatively adding 9 parts of the auxiliary agent prepared in the example 2 into the side line of the extruder by using a peristaltic pump in the extrusion process, performing extrusion granulation, drying granules to obtain a resin material, and performing blow molding on the obtained resin material by using a film blowing machine to form a film, wherein the extrusion temperature is 140-170 ℃, the casting temperature is 45 ℃, the longitudinal stretching temperature is 90 ℃, the stretching ratio is 3.0, the transverse stretching temperature is 70 ℃, and the stretching ratio is 3.2.
The bio-based composite material comprises polylactic acid and PBAT, wherein the weight ratio of the polylactic acid to the PBAT is 1: 4. the weight average molecular weight of the polylactic acid is 1.5 multiplied by 105g·mol-1. PBAT is a copolymer of butylene adipate and butylene terephthalate. The stabilizer is nano silicon dioxide and nano titanium dioxideThe mass ratio is 1: 1 are mixed.
Example 6
A preparation method of a flame-retardant environment-friendly packaging film comprises the following steps:
mixing 120 parts of bio-based composite material, 0.2 part of magnesium stearate, 9 parts of modified starch prepared in example 1, 9 parts of ammonium polyphosphate and 2 parts of stabilizer in parts by weight; adding the mixed raw materials into a double-screw extruder, quantitatively adding 9 parts of the auxiliary agent prepared in the embodiment 3 into the side line of the extruder by using a peristaltic pump in the extrusion process, performing extrusion granulation, drying granules to obtain a resin material, and performing blow molding on the obtained resin material by using a film blowing machine to form a film, wherein the extrusion temperature is 140-170 ℃, the casting temperature is 45 ℃, the longitudinal stretching temperature is 90 ℃, the stretching ratio is 3.0, the transverse stretching temperature is 70 ℃, and the stretching ratio is 3.2.
The bio-based composite material comprises polylactic acid and PBAT, wherein the weight ratio of the polylactic acid to the PBAT is 1: 4. the weight average molecular weight of the polylactic acid is 1.5 multiplied by 105g·mol-1. PBAT is a copolymer of butylene adipate and butylene terephthalate. The stabilizer is nano silicon dioxide and nano titanium dioxide according to the mass ratio of 1: 1 are mixed.
Comparative example 1
The auxiliary agent in example 5 was changed to tributyl citrate, and the rest of the raw materials and the preparation process were kept unchanged.
Comparative example 2
The 2-octenyl succinic anhydride in the example 1 is changed into maleic anhydride, and other raw materials and the preparation process are kept unchanged to prepare modified starch B; the modified starch of example 5 was changed to modified starch B, and the remaining raw materials and preparation process were kept unchanged.
The packaging films prepared in examples 4 to 6 were taken in the same size and counted as m0Then buried in 10cm, taken out every 5 days, washed with ethanol, dried and weighed, and the weight is m1The biodegradation rate is (m)0-m1)/m0X 100%, test for complete degradation days.
Performing flame retardant performance test through vertical combustion and LOI;
the prepared particles are made into a sample bar, and a vertical burning test is carried out in an AG5100B type horizontal vertical burning tester according to ASTM D3801, the size specification of the sample bar is according to 130mm multiplied by 13mm multiplied by 3mm, and the material burning performance is tested after 2 times of ignition (the time is 10 s);
the LOI test was carried out on an oxygen index tester model JF-3 according to ASTM D2863-97, and the specimens were 100mm by 6.5mm by 3mm in size.
The test results are shown in table 1:
TABLE 1
| Example 9 | Example 10 | Example 1 | Comparative example 1 | Comparative example 2 | |
| Number of days | 30 | 30 | 30 | 30 | 30 |
| Oxygen index/% | 31.1 | 31.0 | 30.8 | 27.3 | 30.4 |
| Flame retardant rating | V0 | V0 | V0 | V1 | V0 |
The flame retardant is matched with the added modified starch and the auxiliary agent, so that the flame retardant property is improved.
Mechanical strength was measured by taking the same size of the packaging film prepared in examples 4 to 6, and measuring method: reference GB/T1040.1-2006; the test results are shown in table 2 below:
TABLE 2
| Example 4 | Example 5 | Example 6 | Comparative example 1 | Comparative example 2 | |
| Tensile strength/MPa | 48.5 | 48.7 | 48.1 | 42.1 | 37.9 |
| Elongation at break/% | 548 | 549 | 546 | 495 | 481 |
As can be seen from the data in Table 2, the packaging film prepared by the invention has better mechanical properties and can meet more requirements.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (9)
1. The flame-retardant environment-friendly packaging film is characterized by comprising the following raw materials in parts by weight:
120 parts of bio-based composite material, 0.1-0.2 part of lubricant, 8-9 parts of auxiliary agent, 7-9 parts of modified starch, 7-9 parts of flame retardant and 1-2 parts of stabilizer;
the auxiliary agent is prepared by the following steps:
under the protection of nitrogen, mixing citric acid, an alcohol monomer and a polymerization inhibitor, stirring for 20min at 165 ℃, then cooling to 145 ℃, continuing to stir for 1h, then cooling to 50 ℃, adding phytic acid, continuing to stir for 30min, then heating to 140-150 ℃, continuing to stir for 2h, and obtaining the auxiliary agent.
2. The flame-retardant environment-friendly packaging film as claimed in claim 1, wherein the alcohol monomer is 1, 10-decanediol, the polymerization inhibitor is 2, 5-di-tert-butylhydroquinone, and the addition amount of the polymerization inhibitor is 3% of the molar amount of citric acid.
3. The flame-retardant environment-friendly packaging film according to claim 1, wherein the molar ratio of carboxyl groups in the citric acid to hydroxyl groups in the alcohol monomer is 1: 2; the mass ratio of the citric acid to the phytic acid is 1: 0.2-0.3.
4. The flame-retardant environment-friendly packaging film according to claim 1, wherein the lubricant is one of polyethylene wax and magnesium stearate.
5. The flame-retardant environment-friendly packaging film according to claim 1, wherein the bio-based composite material is composed of polylactic acid and PBAT, and the weight ratio of the polylactic acid to the PBAT is 1: 4.
6. the flame-retardant environment-friendly packaging film as claimed in claim 1, wherein the flame retardant is ammonium polyphosphate.
7. The flame-retardant environment-friendly packaging film as claimed in claim 1, wherein the stabilizer is nano silicon dioxide and nano titanium dioxide in a mass ratio of 1: 1 by mixing.
8. The flame-retardant environment-friendly packaging film as claimed in claim 1, wherein the modified starch is prepared by the following steps:
step S11, mixing 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide with xylene, heating to 80 ℃, dropwise adding the mixed solution, and performing reflux reaction for 24 hours after the mixed solution is added to obtain a modifier;
and step S12, mixing starch and pyridine under the protection of nitrogen, heating and refluxing for 4 hours, cooling, adding a modifier and 4-dimethylaminopyridine, and heating and refluxing for 24 hours to obtain the modified starch.
9. The preparation method of the flame-retardant environment-friendly packaging film according to claim 1, characterized by comprising the following steps:
mixing the bio-based composite material, the lubricant, the modified starch, the flame retardant and the stabilizer in parts by weight; adding the mixed raw materials into a double-screw extruder, adding an auxiliary agent, extruding and granulating, drying granules to obtain a resin material, and performing blow molding on the obtained resin material to form a film, wherein the extrusion temperature is 140-.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102604346A (en) * | 2012-02-28 | 2012-07-25 | 中国地质大学（武汉） | Biodegradable polylactic acid-starch flame retardant composite material and preparation method thereof |
| CN105440606A (en) * | 2014-09-02 | 2016-03-30 | 允友成(宿迁)复合新材料有限公司 | Preparation method of fully biodegradable starch/polylactic acid base resin |
| CN106496975A (en) * | 2016-09-29 | 2017-03-15 | 中国科学院宁波材料技术与工程研究所 | A kind of polylactic acid/starch intumescent flame-retardant composite and preparation method thereof |
| US20200291225A1 (en) * | 2017-09-12 | 2020-09-17 | Jiangsu Golden-Poly Alloy Material Co.,Ltd. | Low cost bio-based full degradable film and preparation method thereof |
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2022
- 2022-03-07 CN CN202210217103.8A patent/CN114426764A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102604346A (en) * | 2012-02-28 | 2012-07-25 | 中国地质大学（武汉） | Biodegradable polylactic acid-starch flame retardant composite material and preparation method thereof |
| CN105440606A (en) * | 2014-09-02 | 2016-03-30 | 允友成(宿迁)复合新材料有限公司 | Preparation method of fully biodegradable starch/polylactic acid base resin |
| CN106496975A (en) * | 2016-09-29 | 2017-03-15 | 中国科学院宁波材料技术与工程研究所 | A kind of polylactic acid/starch intumescent flame-retardant composite and preparation method thereof |
| US20200291225A1 (en) * | 2017-09-12 | 2020-09-17 | Jiangsu Golden-Poly Alloy Material Co.,Ltd. | Low cost bio-based full degradable film and preparation method thereof |
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