CN112608568B - Degradable plastic and preparation method thereof - Google Patents
Degradable plastic and preparation method thereof Download PDFInfo
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- CN112608568B CN112608568B CN202011471426.7A CN202011471426A CN112608568B CN 112608568 B CN112608568 B CN 112608568B CN 202011471426 A CN202011471426 A CN 202011471426A CN 112608568 B CN112608568 B CN 112608568B
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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
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B31/00—Preparation of derivatives of starch
- C08B31/18—Oxidised starch
- C08B31/185—Derivatives of oxidised starch, e.g. crosslinked oxidised starch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses degradable plastic which is prepared from the following raw materials in parts by weight: 50-100 parts of polyvinyl chloride, 5-30 parts of modified tapioca starch, 1-3 parts of maltitol, 1-5 parts of isopropyl triisostearate titanate, 3-6 parts of epoxidized soybean oil and 1-5 parts of polydioxanone. The degradable plastic has simple and convenient manufacturing process and good biodegradability.
Description
Technical Field
The invention relates to the technical field of plastics, in particular to a degradable plastic.
Background
The plastic has the advantages of light weight, stable chemical property, no rust, insulation and easy processing and forming; plastic products bring much convenience to people's life. However, since plastics are made of monomers. The polymer compound artificially synthesized by addition polymerization or polycondensation reaction cannot be effectively decomposed and consumed by microorganisms and the like naturally after being discarded, thereby causing serious environmental problems. At present, white pollution caused by plastics is mainly controlled through garbage classification and recycling, and when waste plastics are recycled, the problems of difficult classification, high economic cost and the like exist in actual operation. Thus, it is increasingly important to prepare a degradable plastic to solve this problem from the source of the plastic production.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides degradable plastic and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
a degradable plastic consists of the following raw materials: polyvinyl chloride, modified tapioca starch, maltitol, isopropyl triisostearate titanate, epoxidized soybean oil and polydioxanone.
Preferably, the degradable plastic consists of the following raw materials in parts by weight: 50-100 parts of polyvinyl chloride, 5-30 parts of modified tapioca starch, 1-3 parts of maltitol, 1-5 parts of isopropyl triisostearate titanate, 3-6 parts of epoxidized soybean oil and 1-5 parts of polydioxanone.
The modified tapioca starch is prepared by the following method:
1) Oxidation reaction: adding 30-70 parts by weight of tapioca starch into 60-140 parts by weight of water, uniformly mixing, regulating the pH to 7-9 by using 0.05-0.2mol/L potassium hydroxide solution, adding 6-10 parts by weight of sodium perborate, reacting for 2-6 hours, centrifuging, washing, and freeze-drying to obtain tapioca starch A;
2) And (3) enzymolysis reaction: adding the cassava starch A obtained in the step 1) into 80-120 parts by weight of 0.02-0.1mol/L phosphate buffer solution, uniformly mixing, heating to 95-105 ℃, stirring for 40-60min, then naturally cooling to 58-65 ℃, adding 2-6 parts by weight of pullulanase, incubating for 6-10h, recrystallizing at 2-6 ℃ to obtain suspension, centrifuging, washing, and freeze-drying to obtain the cassava starch B;
3) Grafting modification: adding 90-115 parts by weight of the cassava starch B obtained in the step 2) into 90-110 ℃ water, stirring and heating for 40-60min at 90-110 ℃, cooling to 20-30 ℃, adding 3-8 parts by weight of a modifier for reaction for 1-3h, centrifuging, washing and freeze-drying to obtain the modified cassava starch.
The modifier is sodium hexametaphosphate and/or potassium pyrophosphate; preferably, the modifier is a mixture of sodium hexametaphosphate and potassium pyrophosphate according to a mass ratio of 3 (1-3).
The modified tapioca starch prepared by the method can generate more short-chain starch after oxidation and enzymolysis treatment, on one hand, a large number of pore structures can be generated on the surface of starch particles, so that the specific surface area is increased, the dispersibility is improved, on the other hand, after oxidation reaction, the carboxyl content of tapioca starch is increased, and then the tapioca starch is subjected to enzymolysis treatment, and the hydroxyl content of tapioca starch is increased, and both carboxyl hydroxyl and hydroxyl can be combined with metaphosphoric acid to form a phosphoester bond, so that the polarity of starch is reduced, the compatibility with nonpolar polymer is improved, and the tapioca starch is beneficial to processing.
A method for preparing degradable plastic, comprising the following steps:
(1) Adding modified tapioca starch and maltitol according to the formula, mixing for 5-15min at the rotation speed of 400-600rpm, adding isopropyl triisostearate, epoxidized soybean oil and polydioxanone, and mixing for 10-20min to obtain a mixture;
(2) And (3) adding polyvinyl chloride into the mixture obtained in the step (1), blending for 30-40min at the rotating speed of 500-800rpm, then placing into an extruder for extrusion granulation, and performing injection molding to obtain the degradable plastic. The extrusion process conditions are as follows: the screw rotation speed is 100-300rpm, and the working temperature of the extrusion section is 150-180 ℃.
The invention has the following beneficial effects: the degradable plastic provided by the invention adopts the modified tapioca starch prepared by the invention, so that the biodegradability is effectively improved, and the preparation method is simple and convenient. After the modified tapioca starch is subjected to oxidation and enzymolysis, more short-chain starch can be generated, on one hand, a large number of hole structures can be generated on the surface of starch particles, so that the specific surface area is increased, the dispersibility is improved, on the other hand, after the tapioca starch is subjected to oxidation reaction, the carboxyl content of the tapioca starch is increased, and then the tapioca starch is subjected to enzymolysis, so that the hydroxyl content of the tapioca starch is increased, and both carboxyl hydroxyl and hydroxyl can be combined with metaphosphoric acid to form a phosphorus ester bond, so that the polarity of the starch is reduced, the compatibility with a nonpolar polymer is improved, and the tapioca starch is favorable for processing.
Detailed Description
The above summary of the present invention is described in further detail below in conjunction with the detailed description, but it should not be understood that the scope of the above-described subject matter of the present invention is limited to the following examples.
Introduction of some of the raw materials in this application:
polyvinyl chloride, trade name Alpha PVC 2222C-78, purchased from Dongguan Beijing plastics raw materials Co.
Tapioca starch, which adopts commercial food-grade tapioca starch, with the product number: 612 available from Xiamen orange bang Xuan Biotechnology Co.
Maltitol, CAS number: 585-88-6 available from Shanghai Michlin Biochemical technologies Co.
Isopropyl triisostearate titanate, CAS number: 61417-49-0, purity: 98%, purchased from Hubei Xinming tai chemical Co., ltd.
Epoxidized soybean oil, CAS number: 8013-07-8, purity: 99%, purchased from Shanghai Bowman biosciences Co.
Sodium perborate, CAS number: 7632-04-4 available from Beijing coupling technologies Co.
Pullulanase, CAS no: 9075-68-7, enzyme activity: 1u/mg, available from Shanghai Yuan Yes Biotechnology Co.
Sodium hexametaphosphate, CAS number: 10124-56-8, available from Qingzhou market, inc.
Potassium pyrophosphate, CAS number: 7320-34-5, available from Shandong Seiya chemical technology Co., ltd.
Polydioxanone, CAS no: 31621-87-1, molecular weight: 10000, available from Wuhan Yuan Co-creation technology Co., ltd.
Example 1
A degradable plastic consists of the following raw materials in parts by weight:
90 parts of polyvinyl chloride, 20 parts of modified tapioca starch, 1.5 parts of maltitol, 3 parts of isopropyl triisostearate titanate, 3.5 parts of epoxidized soybean oil and 2 parts of polydioxanone.
The modified tapioca starch is prepared by the following method:
1) Oxidation reaction: adding 50 parts by weight of tapioca starch into 100 parts by weight of water, uniformly mixing, adjusting the pH to 8 by using 0.1mol/L potassium hydroxide solution, adding 8 parts by weight of sodium perborate, reacting for 3 hours, centrifuging, washing, and freeze-drying to obtain tapioca starch A;
2) And (3) enzymolysis reaction: adding the cassava starch A obtained in the step 1) into 100 parts by weight of 0.05mol/L phosphate buffer solution, uniformly mixing, heating to 100 ℃, stirring for 50min, naturally cooling to 60 ℃, adding 4 parts by weight of pullulanase, incubating for 8h, recrystallizing at 4 ℃ to obtain suspension, centrifuging, washing, and freeze-drying to obtain cassava starch B;
3) Grafting modification: adding 100 parts by weight of water at 100 ℃ obtained in the step 2) into the cassava starch B, stirring and heating for 50min at 100 ℃, then cooling to 25 ℃, adding 5 parts by weight of sodium hexametaphosphate for reaction for 2h, centrifuging, washing and freeze-drying to obtain the modified cassava starch.
A method for preparing degradable plastic, comprising the following steps:
(1) Adding modified tapioca starch and maltitol according to the formula, mixing for 10min at a rotating speed of 500rpm, and adding isopropyl triisostearate, epoxidized soybean oil and polydioxanone, mixing for 15min to obtain a mixture;
(2) And (3) adding polyvinyl chloride into the mixture obtained in the step (1), blending for 35min at the rotating speed of 600rpm, then putting into an extruder, extruding and granulating, and performing injection molding to obtain the degradable plastic. The extrusion process conditions are as follows: the screw speed was 200rpm and the extrusion section operating temperature was 165 ℃.
Comparative example 1
A degradable plastic consists of the following raw materials in parts by weight:
90 parts of polyvinyl chloride, 20 parts of tapioca starch, 1.5 parts of maltitol, 3 parts of isopropyl triisostearate titanate, 3.5 parts of epoxidized soybean oil and 2 parts of polydioxanone.
A method for preparing degradable plastic, comprising the following steps:
(1) Adding tapioca starch and maltitol according to a formula, mixing for 10min at a rotating speed of 500rpm, and adding isopropyl triisostearate, epoxidized soybean oil and polydioxanone, mixing for 15min to obtain a mixture;
(2) And (3) adding polyvinyl chloride into the mixture obtained in the step (1), blending for 35min at the rotating speed of 600rpm, then putting into an extruder, extruding and granulating, and performing injection molding to obtain the degradable plastic. The extrusion process conditions are as follows: the screw speed was 200rpm and the extrusion section operating temperature was 165 ℃.
Comparative example 2
A degradable plastic consists of the following raw materials in parts by weight:
90 parts of polyvinyl chloride, 20 parts of modified tapioca starch, 1.5 parts of maltitol, 3 parts of isopropyl triisostearate titanate, 3.5 parts of epoxidized soybean oil and 2 parts of polydioxanone.
The modified tapioca starch is prepared by the following method:
1) And (3) enzymolysis reaction: adding 50 parts by weight of tapioca starch into 100 parts by weight of 0.05mol/L phosphate buffer solution, uniformly mixing, heating to 100 ℃, stirring for 50min, naturally cooling to 60 ℃, adding 4 parts by weight of pullulanase, incubating for 8h, recrystallizing at 4 ℃ to obtain suspension, centrifuging, washing, and freeze-drying to obtain pretreated tapioca starch;
2) Grafting modification: adding the pretreated tapioca starch obtained in the step 2) into 100 parts by weight of 100 ℃ water, stirring and heating for 50min at the temperature of 100 ℃, then adding 5 parts by weight of sodium hexametaphosphate to react for 2h when cooling to 25 ℃, centrifuging, washing and freeze-drying to obtain the modified tapioca starch.
A method for preparing degradable plastic, comprising the following steps:
(1) Adding modified tapioca starch and maltitol according to the formula, mixing for 10min at a rotating speed of 500rpm, and adding isopropyl triisostearate, epoxidized soybean oil and polydioxanone, mixing for 15min to obtain a mixture;
(2) And (3) adding polyvinyl chloride into the mixture obtained in the step (1), blending for 35min at the rotating speed of 600rpm, then putting into an extruder, extruding and granulating, and performing injection molding to obtain the degradable plastic. The extrusion process conditions are as follows: the screw speed was 200rpm and the extrusion section operating temperature was 165 ℃.
Comparative example 3
A degradable plastic consists of the following raw materials in parts by weight:
90 parts of polyvinyl chloride, 20 parts of modified tapioca starch, 1.5 parts of maltitol, 3 parts of isopropyl triisostearate titanate, 3.5 parts of epoxidized soybean oil and 2 parts of polydioxanone.
The modified tapioca starch is prepared by the following method:
1) Oxidation reaction: adding 50 parts by weight of tapioca starch into 100 parts by weight of water, uniformly mixing, adjusting the pH to 8 by using 0.1mol/L potassium hydroxide solution, adding 8 parts by weight of sodium perborate, reacting for 3 hours, centrifuging, washing, and freeze-drying to obtain tapioca starch A;
2) And (3) enzymolysis reaction: adding the cassava starch A obtained in the step 1) into 100 parts by weight of 0.05mol/L phosphate buffer solution, uniformly mixing, heating to 100 ℃, stirring for 50min, naturally cooling to 60 ℃, adding 4 parts by weight of pullulanase, incubating for 8h, recrystallizing at 4 ℃ to obtain suspension, centrifuging, washing, and freeze-drying to obtain the modified cassava starch.
A method for preparing degradable plastic, comprising the following steps:
(1) Adding modified tapioca starch and maltitol according to the formula, mixing for 10min at a rotating speed of 500rpm, and adding isopropyl triisostearate, epoxidized soybean oil and polydioxanone, mixing for 15min to obtain a mixture;
(2) And (3) adding polyvinyl chloride into the mixture obtained in the step (1), blending for 35min at the rotating speed of 600rpm, then putting into an extruder, extruding and granulating, and performing injection molding to obtain the degradable plastic. The extrusion process conditions are as follows: the screw speed was 200rpm and the extrusion section operating temperature was 165 ℃.
Example 2
A degradable plastic consists of the following raw materials in parts by weight:
90 parts of polyvinyl chloride, 20 parts of modified tapioca starch, 1.5 parts of maltitol, 3 parts of isopropyl triisostearate titanate, 3.5 parts of epoxidized soybean oil and 2 parts of polydioxanone.
The modified tapioca starch is prepared by the following method:
1) Oxidation reaction: adding 50 parts by weight of tapioca starch into 100 parts by weight of water, uniformly mixing, adjusting the pH to 8 by using 0.1mol/L potassium hydroxide solution, adding 8 parts by weight of sodium perborate, reacting for 3 hours, centrifuging, washing, and freeze-drying to obtain tapioca starch A;
2) And (3) enzymolysis reaction: adding the cassava starch A obtained in the step 1) into 100 parts by weight of 0.05mol/L phosphate buffer solution, uniformly mixing, heating to 100 ℃, stirring for 50min, naturally cooling to 60 ℃, adding 4 parts by weight of pullulanase, incubating for 8h, recrystallizing at 4 ℃ to obtain suspension, centrifuging, washing, and freeze-drying to obtain cassava starch B;
3) Grafting modification: adding 100 parts by weight of water at 100 ℃ obtained in the step 2) into the cassava starch B, stirring and heating for 50min at 100 ℃, then cooling to 25 ℃, adding 5 parts by weight of potassium pyrophosphate to react for 2h, centrifuging, washing and freeze-drying to obtain the modified cassava starch.
A method for preparing degradable plastic, comprising the following steps:
(1) Adding modified tapioca starch and maltitol according to the formula, mixing for 10min at a rotating speed of 500rpm, and adding isopropyl triisostearate, epoxidized soybean oil and polydioxanone, mixing for 15min to obtain a mixture;
(2) And (3) adding polyvinyl chloride into the mixture obtained in the step (1), blending for 35min at the rotating speed of 600rpm, then putting into an extruder, extruding and granulating, and performing injection molding to obtain the degradable plastic. The extrusion process conditions are as follows: the screw speed was 200rpm and the extrusion section operating temperature was 165 ℃.
Example 3
A degradable plastic consists of the following raw materials in parts by weight:
90 parts of polyvinyl chloride, 20 parts of modified tapioca starch, 1.5 parts of maltitol, 3 parts of isopropyl triisostearate titanate, 3.5 parts of epoxidized soybean oil and 2 parts of polydioxanone.
The modified tapioca starch is prepared by the following method:
1) Oxidation reaction: adding 50 parts by weight of tapioca starch into 100 parts by weight of water, uniformly mixing, adjusting the pH to 8 by using 0.1mol/L potassium hydroxide solution, adding 8 parts by weight of sodium perborate, reacting for 3 hours, centrifuging, washing, and freeze-drying to obtain tapioca starch A;
2) And (3) enzymolysis reaction: adding the cassava starch A obtained in the step 1) into 100 parts by weight of 0.05mol/L phosphate buffer solution, uniformly mixing, heating to 100 ℃, stirring for 50min, naturally cooling to 60 ℃, adding 4 parts by weight of pullulanase, incubating for 8h, recrystallizing at 4 ℃ to obtain suspension, centrifuging, washing, and freeze-drying to obtain cassava starch B;
3) Grafting modification: adding 100 parts by weight of water at 100 ℃ obtained in the step 2) into the cassava starch B, stirring and heating for 50min at 100 ℃, then cooling to 25 ℃, adding 5 parts by weight of modifier to react for 2h, centrifuging, washing, and freeze-drying to obtain the modified cassava starch. The modifier is a mixture of sodium hexametaphosphate and potassium pyrophosphate according to a mass ratio of 3:2.
A method for preparing degradable plastic, comprising the following steps:
(1) Adding modified tapioca starch and maltitol according to the formula, mixing for 10min at a rotating speed of 500rpm, and adding isopropyl triisostearate, epoxidized soybean oil and polydioxanone, mixing for 15min to obtain a mixture;
(2) And (3) adding polyvinyl chloride into the mixture obtained in the step (1), blending for 35min at the rotating speed of 600rpm, then putting into an extruder, extruding and granulating, and performing injection molding to obtain the degradable plastic. The extrusion process conditions are as follows: the screw speed was 200rpm and the extrusion section operating temperature was 165 ℃.
Test example 1
Biodegradation performance test: referring to GB/T19275-2003 (evaluation of potential biological decomposition and disintegration ability of materials under the action of specific microorganisms), a soil landfill test method is used, and the landfill time is 90 days.
The specific experimental method comprises the following steps: the degradable plastics prepared in examples and comparative examples were cut into samples of 3 cm. Times.3 cm. Times.2 mm in size, 5 samples each, weighed and dried to constant weight (W 0 ) Marking and embedding the sample under the same piece of active soil with the soil water holding capacity of 60wt% and the soil humidity of 36wt% at 10cm under the same condition, taking out the corresponding sample strip after 90 days of filling, washing, drying and weighing (W1), and calculating the weight loss rate (%) = (W) 0 -W1)/W 0 X 100. The biodegradability of the material takes the average weight loss rate (%) of mass change as an evaluation standard, and the higher the numerical value, the better the biodegradability.
TABLE 1 biodegradability of degradable plastics
| Average weight loss rate% | |
| Example 1 | 11.27 |
| Comparative example 1 | 3.97 |
| Comparative example 2 | 8.90 |
| Comparative example 3 | 6.01 |
| Example 2 | 10.40 |
| Example 3 | 13.86 |
Compared with comparative examples 1-3, the modified tapioca starch prepared by the method can effectively improve the degradation performance of plastics. The cassava starch subjected to oxidation, enzymolysis and grafting modification can generate more short-chain starch, on one hand, a large number of hole structures are generated on the surface of starch particles, so that the specific surface area is increased, the dispersibility is improved, on the other hand, after the oxidation reaction, the carboxyl content of the cassava starch is increased, the cassava starch is subjected to enzymolysis treatment, and the hydroxyl content of the cassava starch is increased, and both carboxyl hydroxyl and hydroxyl can be combined with metaphosphate to form a phosphate bond, so that the polarity of the starch is reduced, the compatibility with a nonpolar polymer is improved, and in the degradation process, the massive polyethylene is easily split into small blocks, so that the degradation rate is accelerated.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (3)
1. The degradable plastic is characterized by comprising the following raw materials in parts by weight: 50-100 parts of polyvinyl chloride, 5-30 parts of modified tapioca starch, 1-3 parts of maltitol, 1-5 parts of isopropyl triisostearate titanate, 3-6 parts of epoxidized soybean oil and 1-5 parts of polydioxanone;
the modified tapioca starch is prepared by the following method:
1) Oxidation reaction: adding 30-70 parts by weight of tapioca starch into 60-140 parts by weight of water, uniformly mixing, regulating the pH to 7-9 by using 0.05-0.2mol/L potassium hydroxide solution, adding 6-10 parts by weight of sodium perborate, reacting for 2-6 hours, centrifuging, washing, and freeze-drying to obtain tapioca starch A;
2) And (3) enzymolysis reaction: adding the cassava starch A obtained in the step 1) into 80-120 parts by weight of 0.02-0.1mol/L phosphate buffer solution, uniformly mixing, heating to 95-105 ℃, stirring for 40-60min, then naturally cooling to 58-65 ℃, adding 2-6 parts by weight of pullulanase, incubating for 6-10h, recrystallizing at 2-6 ℃ to obtain suspension, centrifuging, washing, and freeze-drying to obtain the cassava starch B;
3) Grafting modification: adding 90-115 parts by weight of the cassava starch B obtained in the step 2) into 90-110 ℃ water, stirring and heating for 40-60min at 90-110 ℃, then cooling to 20-30 ℃, adding 3-8 parts by weight of a modifier for reaction for 1-3h, centrifuging, washing and freeze-drying to obtain modified cassava starch; the modifier is sodium hexametaphosphate and/or potassium pyrophosphate.
2. A method of preparing a degradable plastic according to claim 1, comprising the steps of:
(1) Adding modified tapioca starch and maltitol according to the formula, mixing for 5-15min at the rotation speed of 400-600rpm, adding isopropyl triisostearate, epoxidized soybean oil and polydioxanone, and mixing for 10-20min to obtain a mixture;
(2) And (3) adding polyvinyl chloride into the mixture obtained in the step (1), blending for 30-40min at the rotating speed of 500-800rpm, then placing into an extruder for extrusion granulation, and performing injection molding to obtain the degradable plastic.
3. The method for preparing the degradable plastic according to claim 2, wherein the extrusion process conditions are as follows: the screw rotation speed is 100-300rpm, and the working temperature of the extrusion section is 150-180 ℃.
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