CN110628185A - Poly (butylene terephthalate) -adipate/poly (methyl ethylene carbonate) full-biodegradable film and preparation method thereof - Google Patents
Poly (butylene terephthalate) -adipate/poly (methyl ethylene carbonate) full-biodegradable film and preparation method thereof Download PDFInfo
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- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Abstract
The invention provides a polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradation composition, which comprises the following raw materials: 50-82 parts of polybutylene terephthalate-adipate resin, 8-40 parts of modified PPC (polypropylene random copolymer), 0.3-3 parts of lubricant, 5-15 parts of macromolecular plasticizer and 1-5 parts of inorganic filler; the modifier of the modified PPC is selected from one or more of maleic anhydride and succinic anhydride. According to the invention, through mixing the polybutylene terephthalate-adipate resin, the modified PPC and other additives, the fluidity and the film forming property of the cast film are increased, the plasticizer has good compatibility with the PBAT and the PPC, can be completely biodegraded, has small volatility, and is combined with the specific proportion, so that the prepared film has the advantages of high tensile and tearing strength, good elastic modulus, good elongation at break, good barrier property, good biodegradability and uniform tensile property in all directions.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradable film and a preparation method thereof.
Background
The petroleum-based plastics cause increasingly serious environmental pollution, and the petroleum-based plastics are urgently needed to replace fully-degradable plastics. Polybutylene terephthalate adipate (PBAT) is a fully degradable plastic which is widely researched at home and abroad. However, films prepared from pure PBAT are relatively soft and costly, and are limited in many applications. Therefore, PBAT is typically modified by blending with other materials during application processing to improve its application properties.
In addition, the high raw material cost of PBAT is a major factor limiting its widespread use. Therefore, adding low-cost filler in the PBAT processing process to carry out blending modification is a necessary process, blending modification is carried out by the PBAT processing process and PPC (polymethyl ethylene carbonate), the material cost can be greatly reduced, and the PPC is a degradable high polymer material, the cost of the PBAT/PPC film after blending modification is greatly reduced, the film has wide application prospect, but the PBAT/PPC has insufficient fluidity when being used as a casting film, the two-phase compatibility is poor, the phenomenon of non-uniform phase morphology can occur in the casting process, the mechanical properties of the film, including tensile strength and tear strength, are low, and how to utilize the prior art to provide a film product with more excellent performance becomes one of the important problems to be solved urgently in the field.
At present, only PBAT/PPC blown film exists, and people like Wuli Zhen obtain the fully biodegradable PBAT/PPC mulching film by a three-layer co-extrusion film blowing processing method. The prior art is similar to the method mainly using the blown film as the main method, the obtained film has orientation, the thickness of the film is easy to deviate, the size is unstable, the deviation of longitudinal and transverse properties is large, and the production speed is slow; the cast film has the advantages of high dimensional stability, good heat sealability, high longitudinal and transverse property balance, high production speed, good transparency and the like. The PBAT/PPC has insufficient fluidity when being used as a casting film, the two-phase compatibility is poor, the phenomenon of nonuniform phase form can occur in the casting process, the mechanical properties of the film, including tensile strength and tear resistance, are low, and the problems need to be solved urgently.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a polybutylene terephthalate-adipate/polymethyl ethylene carbonate fully biodegradable composition, and a film prepared from the composition provided by the present invention has good mechanical properties.
The invention provides a polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradation composition, which comprises the following raw materials:
50-82 parts of polybutylene terephthalate-adipate resin, 8-40 parts of modified PPC (polypropylene random copolymer), 0.3-3 parts of lubricant, 5-15 parts of macromolecular plasticizer and 1-5 parts of inorganic filler; the modifier of the modified PPC is selected from one or more of maleic anhydride and succinic anhydride.
Preferably, the weight ratio of the PPC to the modifier in the modified PPC is (90-100): (0.5-2).
Preferably, the polybutylene terephthalate-adipate has a weight average molecular weight of 7 × 104g/mol～3×105g/mol。
Preferably, the macromolecular plasticizer is poly-diethylene glycol adipate, and the weight-average molecular weight of the poly-diethylene glycol adipate is 2 x 103g/mol～3×104g/mol。
Preferably, the lubricant is selected from one or more of erucamide and ethylene bis stearamide; the inorganic filler is selected from one or more of talcum powder and calcium carbonate.
Preferably, the fully biodegradable cast film feedstock comprises:
55-80 parts of polybutylene terephthalate-adipate resin, 9-36 parts of modified PPC, 0.5-2.5 parts of lubricant, 5-13 parts of macromolecular plasticizer and 2-5 parts of inorganic filler.
The invention provides a polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradable film, which comprises the composition in any one of the technical schemes.
The invention provides a preparation method of a polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradable film, which comprises the following steps:
A) mixing and extruding polybutylene terephthalate-adipate resin, modified PPC, inorganic filler, lubricant and macromolecular plasticizer to obtain casting resin;
B) and casting the casting resin to obtain the polybutylene terephthalate-adipate/polymethyl ethylene carbonate fully biodegradable film.
Preferably, the extrusion temperature in the step A) is 100-190 ℃, the screw rotating speed is 200-350 r/min, and the tape casting processing temperature in the step B) is 120-220 ℃.
Preferably, the modified PPC is prepared by the following method:
mixing the PPC with a modifier, and performing modification treatment to obtain modified PPC; the modifier is selected from one or more of maleic anhydride and succinic anhydride.
Compared with the prior art, the invention provides a polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradation composition, which comprises the following raw materials: 50-82 parts of polybutylene terephthalate-adipate resin, 8-40 parts of modified PPC (polypropylene random copolymer), 0.3-3 parts of lubricant, 5-15 parts of macromolecular plasticizer and 1-5 parts of inorganic filler; the modifier of the modified PPC is selected from one or more of maleic anhydride and succinic anhydride. According to the invention, through mixing the polybutylene terephthalate-adipate resin, the modified PPC and other additives, a macromolecular plasticizer polyethylene glycol adipate (PDEGA) is selected from the additives to increase the fluidity and the film forming property of the cast film, the plasticizer has good compatibility with PBAT and PPC, can be completely biodegraded, has small volatility, is superior to a small molecular plasticizer, is very suitable for cast film processing, and combines the specific proportion, so that the film prepared from the finally prepared composition has the advantages of high tensile and tear strength, good elastic modulus, good elongation at break, good barrier property, good biodegradation property, uniform tensile property and the like.
Detailed Description
The invention provides a polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradable film and a preparation method thereof, and a person skilled in the art can realize the full-biodegradable film by properly improving process parameters by referring to the content. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the scope of the invention. While the method and application of the present invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the method and application, or suitable alterations and combinations thereof, may be made to implement and apply the techniques of the present invention without departing from the spirit and scope of the invention.
The invention provides a polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradation composition, which comprises the following raw materials:
50-82 parts of polybutylene terephthalate-adipate resin, 8-40 parts of modified PPC (polypropylene random copolymer), 0.3-3 parts of lubricant, 5-15 parts of macromolecular plasticizer and 1-5 parts of inorganic filler; the modifier of the modified PPC is selected from one or more of maleic anhydride and succinic anhydride.
The polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradation composition comprises 50-82 parts by weight of polybutylene terephthalate-adipate resin; preferably 55-80 parts by weight of polybutylene terephthalate-adipate resin; more preferably, the polybutylene terephthalate-adipate resin comprises 60 to 75 parts by weight of polybutylene terephthalate-adipate resin.
The polybutylene terephthalate-adipate resin is not limited in source and can be sold on the market; the polybutylene terephthalate-adipate preferably has a weight average molecular weight of 7X 104g/mol～3×105g/mol。
The polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradation composition provided by the invention comprises 8-40 parts by weight of modified PPC; preferably 9 to 36 parts by weight of modified PPC; more preferably 10 to 35 parts by weight of modified PPC; and the modified PPC is most preferably 15-30 parts by weight.
According to the invention, the modifier for modifying PPC is selected from one or more of maleic anhydride and succinic anhydride.
Wherein the weight ratio of PPC to modifier in the modified PPC is preferably (90-100): (0.5 to 2); more preferably (93-100): (0.5 to 1.5); most preferably (95-90): (0.5 to 1.0).
The polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradation composition provided by the invention comprises 0.3-3 parts by weight of lubricant; preferably 0.5 to 2.5 parts by weight of a lubricant; more preferably 1 to 2 parts by weight of a lubricant.
The lubricant is selected from one or more of erucamide and ethylene bis stearamide; the present invention is not limited in its source, and may be commercially available.
The erucamide and the ethylene bis-stearic acid amide are added to be used as a lubricant, so that the lubricating property and the flow-casting processing fluidity of the composition are improved.
The polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradation composition provided by the invention comprises 5-15 parts by weight of macromolecular plasticizer; preferably, the plasticizer comprises 5-13 parts by weight of macromolecular plasticizer; more preferably, the plasticizer comprises 7 to 12 parts by weight of a macromolecular plasticizer.
The macromolecular plasticizer is preferably poly-diethylene glycol adipate, and the weight-average molecular weight of the poly-diethylene glycol adipate is 2 multiplied by 103g/mol～3×104g/mol。
The polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradation composition provided by the invention comprises 1-5 parts by weight of inorganic filler; preferably, the inorganic filler is 2-5 parts by weight; more preferably, the inorganic filler is included in an amount of 3 to 5 parts by weight.
The inorganic filler is selected from one or more of talcum powder and calcium carbonate.
The invention can also improve the fluidity in the casting process by selecting the addition of the inorganic filler talcum powder, greatly reduces the product cost, can be better integrated into the market and meets the market requirement.
In some preferred embodiments of the present invention, the fully biodegradable cast film feedstock comprises:
55-80 parts of polybutylene terephthalate-adipate resin, 9-36 parts of modified PPC, 0.5-2.5 parts of lubricant, 5-13 parts of macromolecular plasticizer and 2-5 parts of inorganic filler.
In some preferred embodiments of the present invention, the fully biodegradable cast film feedstock comprises:
60-75 parts of polybutylene terephthalate-adipate resin, 10-35 parts of modified PPC, 1-2 parts of lubricant, 5-12 parts of macromolecular plasticizer and 3-5 parts of inorganic filler.
The invention provides a polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradable film, which comprises the composition in any one of the technical schemes.
The invention introduces a formula and a preparation method of a fully biodegradable casting film, which breaks through the single method that the existing PBAT/PPC film can only be prepared by an inflation method, develops and uses a casting process to produce a film with stable and excellent performance, and simultaneously solves the technical problems of insufficient tensile strength and tear strength of the film product. The transverse tensile strength and the longitudinal tensile strength of the film respectively reach 21.2MPa and 25.85 MPa; the right-angle tearing strength reaches 138.1KN/m and 130.0KN/m respectively, which reaches the standard of the universal polyethylene film. The film has good water-blocking and gas-blocking performances.
The invention can be used for producing fully biodegradable films, can be used for preparing fully biodegradable film products such as winding films, self-adhesive films, packaging films and the like, replaces non-degradable plastic film bags, and is beneficial to protecting the environment.
The film provided by the invention has excellent mechanical property, simple processing technology and low cost, not only solves the problem of PBAT/PPC cast film, but also achieves the mechanical property level of polyethylene film, can replace polyethylene non-degradable film, can be applied to packaging film products such as winding film, self-adhesive film and the like and mulching film, has the characteristic of complete biodegradation, is beneficial to environmental protection, and has very important application value.
The invention has been clearly described above for the composition according to any one of the above technical schemes, and is not repeated herein.
The invention provides a preparation method of a polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradable film, which comprises the following steps:
A) mixing and extruding polybutylene terephthalate-adipate resin, modified PPC, inorganic filler, lubricant and macromolecular plasticizer to obtain casting resin;
B) and casting the casting resin to obtain the polybutylene terephthalate-adipate/polymethyl ethylene carbonate fully biodegradable film.
The invention provides a preparation method of a polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradable film, which comprises the following steps of firstly preparing modified PPC (polypropylene random copolymer), wherein the modified PP is prepared by the following steps:
and mixing the PPC with a modifier, and performing modification treatment to obtain the modified PPC. The preferable concrete is as follows: mixing the PPC with a modifier, and performing modification treatment by extrusion granulation to obtain modified PPC; the modifier is selected from one or more of maleic anhydride and succinic anhydride.
More preferably specifically:
the material mixing speed is increased to a high speed, the material can be discharged after being stirred at the high speed for about 3-10 minutes, the obtained raw materials are extruded and processed by a double-screw extruder, the extrusion temperature is 100-190 ℃, and the modified PPC resin is obtained through bracing and air cooling and grain cutting.
After the modified PPC resin is obtained, the polybutylene terephthalate-adipate resin, the modified PPC, the inorganic filler, the lubricant and the macromolecular plasticizer are mixed and extruded to obtain the resin for tape casting.
Preferably, the polybutylene terephthalate-adipate resin, the modified PPC, the inorganic filler and the lubricant are mixed, stirred for about 5-10 minutes and then discharged; adding the mixed raw materials into a hopper of a double-screw extruder, and setting the processing temperature of each temperature zone of the extruder, wherein the operation temperature is preferably 100-190 ℃; more preferably 110-180 ℃; the rotating speed of the screw is 200-350 revolutions per minute, more preferably 220-320 revolutions per minute, after the extruder is operated, the macromolecular plasticizer is input into the extruder through a metering pump, and the raw materials are subjected to bracing air cooling and particle cutting to obtain the PBAT/PPC resin for tape casting.
And casting the casting resin to obtain the polybutylene terephthalate-adipate/polymethyl ethylene carbonate fully biodegradable film.
And (3) placing the PBAT/PPC resin for casting into a casting machine for casting, wherein the temperature of each temperature zone of the casting machine is preferably 120-220 ℃, more preferably 150-200 ℃, and finally obtaining a fully-degradable casting film.
The invention provides a polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradation composition, which comprises the following raw materials: 50-82 parts of polybutylene terephthalate-adipate resin, 8-40 parts of modified PPC (polypropylene random copolymer), 0.3-3 parts of lubricant, 5-15 parts of macromolecular plasticizer and 1-5 parts of inorganic filler; the modifier of the modified PPC is selected from one or more of maleic anhydride and succinic anhydride. According to the invention, through mixing the polybutylene terephthalate-adipate resin, the modified PPC and other additives, a macromolecular plasticizer polyethylene glycol adipate (PDEGA) is selected from the additives to increase the fluidity and the film forming property of the cast film, the plasticizer has good compatibility with PBAT and PPC, can be completely biodegraded, has small volatility, is superior to a small molecular plasticizer, is very suitable for cast film processing, and combines the specific proportion, so that the film prepared from the finally prepared composition has the advantages of high tensile and tear strength, good elastic modulus, good elongation at break, good barrier property, good biodegradation property, uniform tensile property in all directions and the like.
In order to further illustrate the present invention, the polybutylene terephthalate-adipate/polymethyl ethylene carbonate fully biodegradable film and the preparation method thereof provided by the present invention are described in detail below with reference to the examples.
Example 1
(1) Weighing 99 parts of PPC and 1 part of maleic anhydride; PPC and maleic anhydride are added in sequence; the mixing speed is increased to a high speed, the materials can be discharged after being stirred at the high speed for about 3 minutes, the obtained raw materials are extruded and processed by a double-screw extruder, the extrusion temperature is 100-190 ℃, and the modified PPC resin is obtained through bracing, air cooling and grain cutting;
(2) weighing 82 parts of PBAT, 9 parts of modified PPC, 5 parts of talcum powder, 1 part of erucamide and 1 part of ethylene bisstearamide;
(3) adding the raw materials into a stirrer in a certain sequence, wherein the adding sequence comprises PBAT, modified PPC, talcum powder, erucamide and ethylene bisstearamide; stirring for about 5 minutes to discharge;
(4) adding the mixed raw materials into a hopper of a double-screw extruder, and setting the processing temperature of each temperature zone of the extruder to be 100-190 ℃;
(5) after the extruder is operated, the macromolecular plasticizer is input into the extruder through a metering pump, the using amount is 5 parts, and the raw materials are subjected to bracing, air-cooling and grain-cutting to obtain PBAT/PPC modified resin;
(6) and (3) placing the PBAT/PPC modified resin into a casting machine for casting, wherein the temperature of each temperature zone of the casting machine is 120-220 ℃, and finally obtaining a fully-degradable cast film.
Example 2
(1) Weighing 99 parts of PPC and 1 part of maleic anhydride; PPC and maleic anhydride are added in sequence; the mixing speed is increased to a high speed, the materials can be discharged after being stirred at the high speed for about 3 minutes, the obtained raw materials are extruded and processed by a double-screw extruder, the extrusion temperature is 100-190 ℃, and the modified PPC resin is obtained through bracing, air cooling and grain cutting;
(2) weighing 82 parts of PBAT, 9 parts of modified PPC, 5 parts of talcum powder, 1 part of erucamide and 1 part of ethylene bisstearamide;
(3) adding the raw materials into a stirrer in a certain sequence, wherein the adding sequence comprises PBAT, modified PPC, talcum powder, erucamide and ethylene bisstearamide; stirring for about 5 minutes to discharge;
(4) adding the mixed raw materials into a hopper of a double-screw extruder, and setting the processing temperature of each temperature zone of the extruder to be 100-190 ℃;
(5) after the extruder is operated, inputting the macromolecular plasticizer into the extruder through a metering pump, wherein the using amount of the macromolecular plasticizer is 10 parts, and the PBAT/PPC modified resin is obtained by bracing, air-cooling and granulating the raw materials;
(6) and (3) placing the PBAT/PPC modified resin into a casting machine for casting, wherein the temperature of each temperature zone of the casting machine is 120-220 ℃, and finally obtaining a fully-degradable cast film.
Example 3
(1) Weighing 99 parts of PPC and 1 part of maleic anhydride; PPC and maleic anhydride are added in sequence; the mixing speed is increased to a high speed, the materials can be discharged after being stirred at the high speed for about 3 minutes, the obtained raw materials are extruded and processed by a double-screw extruder, the extrusion temperature is 100-190 ℃, and the modified PPC resin is obtained through bracing, air cooling and grain cutting;
(2) weighing 50 parts of PBAT, 36 parts of modified PPC, 5 parts of talcum powder, 1 part of erucamide and 1 part of ethylene bisstearamide;
(3) adding the raw materials into a stirrer in a certain sequence, wherein the adding sequence comprises PBAT, modified PPC, talcum powder, erucamide and ethylene bisstearamide; stirring for about 5 minutes to discharge;
(4) adding the mixed raw materials into a hopper of a double-screw extruder, and setting the processing temperature of each temperature zone of the extruder to be 100-190 ℃;
(5) after the extruder is operated, inputting the macromolecular plasticizer into the extruder through a metering pump, wherein the using amount of the macromolecular plasticizer is 10 parts, and the PBAT/PPC modified resin is obtained by bracing, air-cooling and granulating the raw materials;
(6) and (3) placing the PBAT/PPC modified resin into a casting machine for casting, wherein the temperature of each temperature zone of the casting machine is 120-220 ℃, and finally obtaining a fully-degradable cast film.
Example 4
(1) 99 parts of PPC and 0.5 part of maleic anhydride are weighed; PPC and maleic anhydride are added in sequence; the mixing speed is increased to a high speed, the materials can be discharged after being stirred at the high speed for about 3 minutes, the obtained raw materials are extruded and processed by a double-screw extruder, the extrusion temperature is 100-190 ℃, and the modified PPC resin is obtained through bracing, air cooling and grain cutting;
(2) weighing 60 parts of PBAT, 24 parts of modified PPC, 5 parts of talcum powder, 1 part of erucamide and 1 part of ethylene bisstearamide;
(3) adding the raw materials into a stirrer in a certain sequence, wherein the adding sequence comprises PBAT, modified PPC, talcum powder, erucamide and ethylene bisstearamide; stirring for about 5 minutes to discharge;
(4) adding the mixed raw materials into a hopper of a double-screw extruder, and setting the processing temperature of each temperature zone of the extruder to be 100-190 ℃;
(5) after the extruder is operated, inputting the macromolecular plasticizer into the extruder through a metering pump, wherein the using amount of the macromolecular plasticizer is 10 parts, and the PBAT/PPC modified resin is obtained by bracing, air-cooling and granulating the raw materials;
(6) and (3) placing the PBAT/PPC modified resin into a casting machine for casting, wherein the temperature of each temperature zone of the casting machine is 120-220 ℃, and finally obtaining a fully-degradable cast film.
Example 5
(1) Weighing 99 parts of PPC and 1 part of maleic anhydride; PPC and maleic anhydride are added in sequence; the mixing speed is increased to a high speed, the materials can be discharged after being stirred at the high speed for about 3 minutes, the obtained raw materials are extruded and processed by a double-screw extruder, the extrusion temperature is 100-190 ℃, and the modified PPC resin is obtained through bracing, air cooling and grain cutting;
(2) weighing 60 parts of PBAT, 24 parts of modified PPC, 5 parts of talcum powder, 1 part of erucamide and 1 part of ethylene bisstearamide;
(3) adding the raw materials into a stirrer in a certain sequence, wherein the adding sequence comprises PBAT, modified PPC, talcum powder, erucamide and ethylene bisstearamide; stirring for about 5 minutes to discharge;
(4) adding the mixed raw materials into a hopper of a double-screw extruder, and setting the processing temperature of each temperature zone of the extruder to be 100-190 ℃;
(5) after the extruder is operated, inputting the macromolecular plasticizer into the extruder through a metering pump, wherein the using amount of the macromolecular plasticizer is 10 parts, and the PBAT/PPC modified resin is obtained by bracing, air-cooling and granulating the raw materials;
(6) and (3) placing the PBAT/PPC modified resin into a casting machine for casting, wherein the temperature of each temperature zone of the casting machine is 120-220 ℃, and finally obtaining a fully-degradable cast film.
Example 6
(1) Weighing 99 parts of PPC and 1 part of maleic anhydride; PPC and maleic anhydride are added in sequence; the mixing speed is increased to a high speed, the materials can be discharged after being stirred at the high speed for about 3 minutes, the obtained raw materials are extruded and processed by a double-screw extruder, the extrusion temperature is 100-190 ℃, and the modified PPC resin is obtained through bracing, air cooling and grain cutting;
(2) weighing 68 parts of PBAT, 20 parts of modified PPC, 5 parts of talcum powder, 1 part of erucamide and 1 part of ethylene bisstearamide;
(3) adding the raw materials into a stirrer in a certain sequence, wherein the adding sequence comprises PBAT, modified PPC, talcum powder, erucamide and ethylene bisstearamide; stirring for about 5 minutes to discharge;
(4) adding the mixed raw materials into a hopper of a double-screw extruder, and setting the processing temperature of each temperature zone of the extruder to be 100-190 ℃;
(5) after the extruder is operated, the macromolecular plasticizer is input into the extruder through a metering pump, the using amount is 5 parts, and the raw materials are subjected to bracing, air-cooling and grain-cutting to obtain PBAT/PPC modified resin;
(6) and (3) placing the PBAT/PPC modified resin into a casting machine for casting, wherein the temperature of each temperature zone of the casting machine is 120-220 ℃, and finally obtaining a fully-degradable cast film.
Comparative example 1
(1) Weighing 68 parts of PBAT, 20 parts of PPC, 5 parts of talcum powder, 1 part of erucamide and 1 part of ethylene bis stearamide;
(2) adding the raw materials into a stirrer in a certain sequence, wherein the raw materials comprise PBAT, PPC, talcum powder, erucamide and ethylene bisstearamide in sequence; stirring for about 5 minutes to discharge;
(3) adding the mixed raw materials into a hopper of a double-screw extruder, and setting the processing temperature of each temperature zone of the extruder to be 100-190 ℃;
(4) and (3) placing the PBAT/PPC modified resin into a casting machine for casting, wherein the temperature of each temperature zone of the casting machine is 120-220 ℃, and finally obtaining a fully-degradable cast film.
TABLE 1 Properties of the materials prepared with the components of the examples and comparative examples
As can be seen from Table 1, as the PBAT content increases, the tensile strength, tear strength and elongation at break all increase; the addition of the maleic anhydride can obviously improve the interfacial bonding capability of the PBAT and the PPC, so that the beneficial effects of improving the tensile strength and the tearing strength of the material are achieved; when the amount of the macromolecular plasticizer is increased, the fluidity and the elongation at break of the PBAT/PPC cast film can be effectively increased, so that the mechanical property of the material is obviously improved, and the gas transmittance is increased along with the increase of the plasticizer; however, as the PPC content is further increased, the mechanical properties of the material show a tendency to decrease.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradation composition is characterized by comprising the following raw materials:
50-82 parts of polybutylene terephthalate-adipate resin, 8-40 parts of modified PPC, 0.3-3 parts of lubricant, 5-15 parts of macromolecular plasticizer and 1-5 parts of inorganic filler; the modifier of the modified PPC is selected from one or more of maleic anhydride and succinic anhydride.
2. The composition of claim 1, wherein the weight ratio of PPC to modifier in the modified PPC is (90-100): (0.5-2).
3. The composition of claim 1, wherein the polybutylene terephthalate-adipate has a weight average molecular weight of 7 x 104g/mol～3×105g/mol。
4. The composition of claim 1, wherein the macromolecular plasticizer is poly (diethylene glycol adipate) having a weight average molecular weight of 2 x 103g/mol～3×104g/mol。
5. The composition of claim 1, wherein the lubricant is selected from one or more of erucamide and ethylene bis stearamide; the inorganic filler is selected from one or more of talcum powder and calcium carbonate.
6. The composition of claim 1, wherein the fully biodegradable cast film feedstock comprises:
55-80 parts of polybutylene terephthalate-adipate resin, 9-36 parts of modified PPC, 0.5-2.5 parts of lubricant, 5-13 parts of macromolecular plasticizer and 2-5 parts of inorganic filler.
7. A polybutylene terephthalate-adipate/polymethyl ethylene carbonate fully biodegradable film characterized by comprising the composition according to any one of claims 1 to 6.
8. A method for preparing polybutylene terephthalate-adipate/polymethyl ethylene carbonate full-biodegradable film is characterized by comprising the following steps:
A) mixing and extruding polybutylene terephthalate-adipate resin, modified PPC, inorganic filler, lubricant and macromolecular plasticizer to obtain casting resin;
B) and casting the casting resin to obtain the polybutylene terephthalate-adipate/polymethyl ethylene carbonate fully biodegradable film.
9. The preparation method according to claim 8, wherein the extrusion temperature in the step A) is 100-190 ℃, the screw rotation speed is 200-350 r/min, and the casting processing temperature in the step B) is 120-220 ℃.
10. The process according to claim 8, wherein said modified PPC is prepared by:
mixing the PPC with a modifier, and performing modification treatment to obtain modified PPC; the modifier is selected from one or more of maleic anhydride and succinic anhydride.
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