CN114163791B - Modified polyglycolic acid composition, modified polyglycolic acid material, and preparation method and application thereof - Google Patents

Modified polyglycolic acid composition, modified polyglycolic acid material, and preparation method and application thereof Download PDF

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CN114163791B
CN114163791B CN202010836760.1A CN202010836760A CN114163791B CN 114163791 B CN114163791 B CN 114163791B CN 202010836760 A CN202010836760 A CN 202010836760A CN 114163791 B CN114163791 B CN 114163791B
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polyglycolic acid
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ethylene
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王荣
孙小杰
陈兰兰
梁文斌
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China Energy Investment Corp Ltd
National Institute of Clean and Low Carbon Energy
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National Institute of Clean and Low Carbon Energy
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Abstract

The invention relates to the field of polyglycolic acid modification, and discloses a modified polyglycolic acid composition, a modified polyglycolic acid material, a preparation method and application thereof. Note that the modified polyglycolic acid composition comprises polyglycolic acid, a toughening resin, and an improver; the toughening resin is selected from at least one of polyethylene, polypropylene and polyolefin elastomer; the modifier is at least one selected from the group consisting of amino grafted polyolefin, maleic anhydride polyolefin copolymer, maleic anhydride grafted polyolefin elastomer and epoxy compound. The invention selects proper toughening resin and adds an improver to improve the compatibility among the resins, improve the toughness of the PGA, prepare the high-toughness PGA material and solve the problem of PGA toughening modification.

Description

Modified polyglycolic acid composition, modified polyglycolic acid material, and preparation method and application thereof
Technical Field
The invention relates to the field of polyglycolic acid modification, in particular to a modified polyglycolic acid composition, a modified polyglycolic acid material, a preparation method and application thereof.
Background
Polyglycolic acid (PGA for short) is an aliphatic polyester polymer material with the least unit carbon number, fully decomposable ester structure and the highest degradation speed, and has good performance advantages:
1) Excellent gas barrier property: the barrier property to oxygen and water vapor is 100 times of PET, PLA is 1000 times, and the barrier property of PGA to gas is not affected by the environmental temperature basically, thus being an ideal barrier packaging material;
2) The mechanical properties are excellent: flexural and tensile strength are higher than typical resins such as PP, and even better than many engineering plastics such as: PC, PET, PA6 and the like, and can make up the defect of poor mechanical strength of the biodegradable material;
3) Excellent in degradability: PGA has degradation properties similar to those of natural fibers and can be decomposed within one month. Can meet the requirement of degrading materials.
PGA is an environmentally friendly, ideal packaging material due to its performance advantages. However, PGA has the disadvantages of high brittleness and low melt strength, and severely restricts its processing application in fields such as films. CN1059919a discloses films containing polyhydroxyacids and a compatibilizer, the present invention relates to certain compositions useful for making films comprising Polyhydroxyacids (PHA) and a compatibilizer, and their preparation. Also relates to films containing such compositions and other polymers, in particular consisting of 5-95% polyhydroxyacids and 5-75% compatibilizing agents. Wherein the polyhydroxyacid comprises: polyglycolic acid, polylactic acid, polyglycolic acid/polylactic acid copolymers. The compatilizer comprises: ethylene/maleic anhydride graft copolymers or ethylene/ethylene oxide copolymers. In the invention, the toughening resin is polyethylene/polypropylene, the compatilizer is ethylene/maleic anhydride graft copolymer or ethylene/ethylene oxide copolymer, other elastomers and the like are not included, and compared with the elastomers, the toughness of the polyethylene/polypropylene is not high, so that the toughness is increased only a limited extent.
CN102131868A discloses a hydrolysis resistant polyester composition comprising a polyester, a first modifier and a second modifier; the first modifier comprises a polymer that is incompatible with the polyhydroxyalkanoic acid and is not an acid-containing polymer or an acid-generating polymer, and specifically comprises: ethylene copolymers, core-shell polymers, copolyether esters, epoxidized oils, acrylonitrile styrene copolymers, styrene-containing polymers, aromatic polyesters, aliphatic-aromatic polyesters, ethylene propylene diene monomer, polyolefin, or combinations of two or more thereof; the second modifier comprises: polycarbodiimide, carbodiimide, diimide compounds, or combinations thereof. The second modifier added is a carboxyl end-capping agent, which is mainly used for improving the hydrolysis resistance of polyglycolic acid, and does not relate to a compatilizer. The two phases are still incompatible systems, and the mechanical properties are not improved.
Therefore, the toughening modification of the PGA is necessary to develop the tough PGA material, but the toughening modification research of the PGA is less at present, and the toughness and compatibility problems of the material also need to be solved.
Disclosure of Invention
The invention aims to solve the problems of poor toughness and poor modifier of the existing polyglycolic acid material, and provides a modified polyglycolic acid composition, a modified polyglycolic acid material, a preparation method and application thereof.
In order to achieve the above object, the first aspect of the present invention provides a modified polyglycolic acid composition comprising polyglycolic acid, a toughening resin and an improver; the toughening resin is selected from at least one of polyethylene, polypropylene and polyolefin elastomer; the modifier is at least one selected from the group consisting of amino grafted polyolefin, maleic anhydride polyolefin copolymer, maleic anhydride grafted polyolefin elastomer and epoxy compound.
The second aspect of the invention provides a method for preparing a modified polyglycolic acid material, comprising: the composition of the invention is subjected to melt extrusion to obtain the modified polyglycolic acid material.
The third aspect of the invention provides a modified polyglycolic acid material prepared by the preparation method of the invention.
The fourth aspect of the invention provides an application of the material in films, cutlery boxes, hollow containers and 3D printing.
Through the technical scheme, the invention selects proper toughening resin and adds the modifier to improve the compatibility among the resins, improve the toughness of the PGA, prepare the high-toughness PGA material and solve the problem in the toughening modification of the PGA.
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FIG. 1 is an SEM image of the polyglycolic acid material produced in comparative example 2;
FIG. 2 is an SEM image of a modified polyglycolic acid material produced in example 1 of the present invention.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
The first aspect of the present invention provides a modified polyglycolic acid composition comprising: polyglycolic acid, toughening resin and modifier; the toughening resin is selected from at least one of polyethylene, polypropylene and polyolefin elastomer; the modifier is at least one selected from the group consisting of amino grafted polyolefin, maleic anhydride polyolefin copolymer, maleic anhydride grafted polyolefin elastomer and epoxy compound.
In some embodiments of the invention, the composition provides components in amounts satisfying the following relationship, with 40 to 95 parts by weight polyglycolic acid, 5 to 60 parts by weight toughening resin, and 0.5 to 10 parts by weight modifier. The composition can enable the polyglycolic acid material to be further prepared to have high toughness and high strength.
In some embodiments of the present invention, preferably, the polyglycolic acid is 50-80 parts by weight, the toughening resin is 20-50 parts by weight, and the modifier is 2-5 parts by weight.
In some embodiments of the invention, the polyglycolic acid is selected to provide a high mechanical strength effect. Preferably, the polyglycolic acid has a weight average molecular weight of from 5 to 50, preferably from 10 to 30. Preferably, the polyglycolic acid has a melt index of 20-100g/10min at 240℃and a load of 2.16 kg. The polyglycolic acid is commercially available, for example, from Shanghai Pu Jing chemical technology Co., ltd.
In some embodiments of the invention, preferably, the melt viscosity of the composition at 240 ℃ is 1000-50000pa·s. In the present invention, the melt viscosity of the composition is measured using a rheometric method, at 240℃with a strain of 2% and a frequency of 0.05 rad/s. The composition may have better processability.
In the present invention, the polyglycolic acid and the composition satisfy the above-described relationship, and can provide the action or effect of enhancing melt strength, improving processability and increasing toughness.
In some embodiments of the present invention, the use of the toughening resin for toughening can improve the notched impact properties of the resulting modified polyglycolic acid material. Preferably, the polyethylene has a density of 0.9 to 0.96g/cm 3 The melt index of the polyethylene at 190 ℃ and a load of 2.16kg is 0.1-15g/10min.
Preferably, the polypropylene has a density of 0.9-0.96g/cm 3 The melt index of the polypropylene at 230 ℃ and a load of 2.16kg is 0.2-20g/10min.
Preferably, the polyolefin elastomer is at least one of an ethylene and α -olefin copolymer, a propylene-ethylene copolymer, and an ethylene propylene diene monomer. The polyolefin elastomer has a density of 0.86 to 0.95g/cm 3 The melt index at 230 ℃ and under a load of 2.16kg is 0.3-30g/10min. Preferably, the polyolefin elastomer is an ethylene-octene copolymer, a polypropylene-polyethylene block copolymer. The toughening resin is commercially available, for example, polypropylene PP 8101 (density 0.90 g/cm) 3 The melt index at 230℃and a load of 2.16kg was 0.36g/10 min). Polyolefin elastomer POE8457 of Dow chemical (density of 0.87g/cm 3 The melt index at 190℃and a load of 2.16kg was 3.0g/10 min).
In some embodiments of the invention, the modifier is capable of providing a reaction with a two-phase component or increasing polarity to enhance two-phase interfacial interactions, resulting in a technical effect of improving compatibility and increasing toughness. Preferably, the amino grafted polyolefin has a structure represented by formula 1:
Figure BDA0002639965210000051
wherein (1)>
Figure BDA0002639965210000052
The polymer chains shown are polyethylene, polypropylene or polyethylene elastomers; the ammoniaThe grafting yield of the base grafted polyolefin is from 0.2 to 2% by weight, et representing ethyl.
The grafting ratio of the maleic anhydride grafted polyolefin elastomer is 0.2-5 wt%. Commercially available, for example, are the Dow GR216 (grafting ratio of 0.5 wt% to 1.0 wt%). The maleic anhydride grafted polyolefin elastomer meeting the performance parameters can be beneficial to providing the modified polyglycolic acid material further obtained by the composition with high toughness.
The maleic anhydride polyolefin copolymer has a structure represented by formula 2:
Figure BDA0002639965210000053
wherein R is H, C 1 -C 6 Alkyl, phenyl or C 1 -C 6 Alkoxy, n is an integer of 2 or more.
In some embodiments of the present invention, preferably, the epoxy compound includes, but is not limited to, copolymers containing Glycidyl Methacrylate (GMA) groups; wherein the content of Glycidyl Methacrylate (GMA) groups is between 0.5% and 20% by weight. Preferably, the epoxy compound is at least one selected from the group consisting of a styrene-acrylonitrile-glycerol methacrylate copolymer, an ethylene-methyl acrylate-glycerol methylpropionate copolymer, an ethylene-ethyl acrylate-glycerol methacrylate copolymer, a POE elastomer-glycidyl methacrylate copolymer, and a styrene-methacrylate-glycerol methacrylate copolymer. Commercially available are, for example, SOG-02 (POE-g-GMA, content of GMA 0.8-1.2% by weight) which is readily produced.
In the present invention, the modifier is capable of reacting with PGA in the composition to form a graft polymer, increasing the two-phase compatibility of polyglycolic acid with the toughening resin. In some embodiments, the weight ratio of toughening resin to modifier is 4-20:1, preferably 4-10:1. When the mutual amount of the toughening resin and the modifier is in the range, the toughening resin and the modifier have better synergy, so that the two-phase compatibility of the polyglycolic acid and the toughening resin can be better improved, and the obtained modified polyglycolic acid material can have the balance of toughness and rigidity. The use amount of the toughening resin is too small, and the toughness of the prepared material is limited to increase and insufficient; the excessive amount of toughening resin can affect the final rigidity of the resulting material.
The second aspect of the invention provides a method for preparing a modified polyglycolic acid material, comprising: the composition of the invention is subjected to melt extrusion to obtain the modified polyglycolic acid material.
In a specific embodiment provided by the present invention, the preparation method may include:
1) Drying polyglycolic acid, toughening resin and modifier for later use;
2) Uniformly mixing the dried polyglycolic acid, the toughening resin and the improver according to the component dosage in the composition;
3) And (3) mixing the obtained materials in the step (2), performing melt extrusion, and granulating to obtain the modified polyglycolic acid.
In some embodiments of the present invention, preferably, the melt blending conditions include: the temperature is 225-250 ℃, preferably 235-240 ℃; the time is 4-10min, preferably 5-8min; the extruder speed is 60-110rpm, preferably 80-100rpm.
In the present invention, the inventors have studied the conditions of melt blending and found that, when the modified polyglycolic acid composition is melt blended under the above conditions, degradation of polyglycolic acid during extrusion can be avoided, and deterioration of the properties of the obtained polyglycolic acid composition can be avoided.
The third aspect of the invention provides a modified polyglycolic acid material prepared by the preparation method of the invention.
The modified polyglycolic acid material prepared by the invention has improved performance, and in preferred embodiments, the notch impact strength of the modified polyglycolic acid material can be improved by more than 1.5 times compared with that of polyglycolic acid to be more than or equal to 4kJ/m 2 And the flexural modulus is more than 1.5GPa, the flexural strength is more than 60MPa, and the material with high rigidity and toughness balance is obtained.
The fourth aspect of the invention provides an application of the material in films, cutlery boxes, hollow containers and 3D printing.
In the present invention, the melt index is determined in accordance with GB/T3682-2000.
The present invention will be described in detail by examples. In the following examples, SEM observation was carried out on the obtained modified polyglycolic acid material, and the sample was quenched with liquid nitrogen cooling using Nova NanoSEM 450, and the cross section was observed after carbon spraying. The dispersion and particle status of the components in the material were observed.
The notched impact strength of the samples was measured according to GB/T1043-2008, and the samples were measured for at least 5 samples and averaged.
The flexural properties of the samples were determined according to GB/T1843-2008, at least 5 samples were tested and averaged.
The melt viscosity of the sample was determined rheologically at 240℃with a strain of 2% and a frequency of 0.05 rad/s.
Polyglycolic acid (PGA) was supplied by Shanghai Pu Jing chemical technology Co., ltd and was designated as PGA-1 (melt index 64.0g/10min, weight average molecular weight 15 ten thousand); PGA-2 (melt index 45.0g/10min, weight average molecular weight 20 ten thousand); PGA-3 (melt index 85.0g/10min, weight average molecular weight 9 ten thousand).
Toughening resin 1: polyolefin elastomer: POE8457 (Density of 0.87 g/cm) 3 Melt index at 190℃and 2.16kg load of 3.0g/10 min) was purchased from Dow chemical;
toughening resin 2: polypropylene PP 8101 (Density 0.90 g/cm) 3 Melt index at 230 ℃ and 2.16kg load of 0.36g/10 min), petrifaction in China;
improver 1: POE-g-MAH (maleic anhydride grafted polyolefin elastomer, GR216, grafting ratio 0.5 wt% to 1.0 wt%) was purchased from Dow chemical
Modifier 2: POE-g-GMA (epoxy compound, SOG-02, GMA content of 0.8-1.2% by weight) was purchased from Jia Yi Rong;
modifier 3: the amino grafted polyolefin (PP-g-NHR) is synthesized as follows:
fully mixing 0.5-3 parts by weight of N-ethyl ethylenediamine liquid with 100 parts by weight of PP-g-MAH, adding into a double screw extruder, extruding at 200 ℃ and granulating at 100rmp, thus obtaining the amino grafted polypropylene PP-g-NHR. The grafting ratio is 0.5-2 wt%.
In the following examples and comparative examples, polyglycolic acid, toughening resin and modifier were used after drying.
Example 1
Uniformly mixing 80 parts by weight of polyglycolic acid PGA-1, 20 parts by weight of polypropylene (PP 8101) and 5 parts by weight of modifier 3 (amino grafted polypropylene, PP-g-NHR), and then carrying out melt blending for 6min at 240 ℃ by using a double screw extruder, wherein the rotating speed of the extruder is 100rpm, and extruding and granulating to obtain the modified polyglycolic acid material.
The formulation of the composition and the test results are shown in Table 1. SEM observation of the obtained modified polyglycolic acid material was carried out, and the obtained photograph is shown in FIG. 2. As can be seen from fig. 2, the compatibility between polar PGA and nonpolar PP allows the two-phase size to be reduced.
Example 2
Uniformly mixing 80 parts by weight of polyglycolic acid PGA-1, 20 parts by weight of POE8457 and 5 parts by weight of modifier 3 (PP-g-NHR), and then carrying out melt blending for 8min at 235 ℃ by using a double-screw extruder, wherein the rotating speed of the extruder is 80rpm, and extruding and granulating to obtain the modified polyglycolic acid material.
The formulation of the composition and the test results are shown in Table 1.
Example 3
Uniformly mixing 80 parts by weight of polyglycolic acid, 20 parts by weight of POE8457 and 2 parts by weight of modifier 3 (PP-g-NHR), and then carrying out melt blending for 8min at 235 ℃ by using a double-screw extruder, wherein the rotating speed of the extruder is 80rpm, and extruding and granulating to obtain the modified polyglycolic acid material.
The formulation of the composition and the test results are shown in Table 1.
Example 4
Uniformly mixing 65 parts by weight of polyglycolic acid PGA-1, 35 parts by weight of POE8457 and 5 parts by weight of modifier 3 (PP-g-NHR), and then carrying out melt blending for 8min at 235 ℃ by using a double-screw extruder, wherein the rotating speed of the extruder is 80rpm, and extruding and granulating to obtain the modified polyglycolic acid material.
The formulation of the composition and the test results are shown in Table 1.
Example 5
50 parts by weight of polyglycolic acid PGA-1, 50 parts by weight of POE8457 and 5 parts by weight of modifier 3 (PP-g-NHR) are uniformly mixed, and then melt blending is carried out for 8 minutes by a double screw extruder at 235 ℃, and extrusion granulation is carried out at the speed of 80rpm, so as to obtain the modified polyglycolic acid material.
The formulation of the composition and the test results are shown in Table 1.
Example 6
Uniformly mixing 80 parts by weight of polyglycolic acid PGA-1, 20 parts by weight of POE8457 and 5 parts by weight of modifier 1 (POE-g-MAH), and then carrying out melt blending for 5min at 240 ℃ by using a double-screw extruder, wherein the rotating speed of the extruder is 90rpm, and extruding and granulating to obtain the modified polyglycolic acid material.
The formulation of the composition and the test results are shown in Table 1.
Example 7
Uniformly mixing 80 parts by weight of polyglycolic acid PGA-1, 20 parts by weight of POE8457 and 5 parts by weight of modifier 2 (POE-g-GMA), and then carrying out melt blending for 6min at 240 ℃ by using a double-screw extruder, wherein the rotating speed of the extruder is 100rpm, and extruding and granulating to obtain the modified polyglycolic acid material.
The formulation and preparation conditions of the composition are shown in Table 1, and the test results are shown in Table 2.
Example 8
Uniformly mixing 80 parts by weight of polyglycolic acid PGA-2, 20 parts by weight of POE8457 and 5 parts by weight of modifier 3 (PP-g-NHR), and then carrying out melt blending for 8min at 235 ℃ by using a double-screw extruder, wherein the rotating speed of the extruder is 80rpm, and extruding and granulating to obtain the modified polyglycolic acid material.
The formulation of the composition and the test results are shown in Table 1.
Example 9
Uniformly mixing 80 parts by weight of polyglycolic acid PGA-3, 20 parts by weight of POE8457 and 5 parts by weight of modifier 3 (PP-g-NHR), and then carrying out melt blending for 8min at 235 ℃ by using a double-screw extruder, wherein the rotating speed of the extruder is 80rpm, and extruding and granulating to obtain the modified polyglycolic acid material.
The formulation of the composition and the test results are shown in Table 1.
Comparative example 1
100 parts by weight of PGA-1 was melt-extruded and pelletized by a twin screw extruder at 240℃for 6 minutes at a rotational speed of 100rpm. The test results are shown in Table 1.
Comparative example 2
100 parts by weight of polyglycolic acid PGA-1 and 5 parts by weight of modifier 3 (PP-g-NHR) were uniformly mixed, and then melt-blended at 240℃for 6 minutes by means of a twin-screw extruder, and extrusion granulation was carried out at a rotational speed of 100rpm. The formulation of the composition and the test results are shown in Table 1.
Comparative example 3
80 parts by weight of polyglycolic acid PGA-1 and 20 parts by weight of polypropylene (PP 8101) were uniformly mixed, and then melt-blended at 240℃for 6 minutes by a twin-screw extruder, and extrusion granulation was carried out at a rotational speed of 100rpm.
The formulation of the composition and the test results are shown in Table 1. SEM observation of the obtained polyglycolic acid material was carried out, and the obtained photograph was shown in FIG. 1. As can be seen from fig. 1, the blending between PGA and toughening resin PP has a distinct phase separation structure and a relatively large phase size.
Comparative example 4
80 parts by weight of polyglycolic acid PGA-1 and 20 parts by weight of POE8457 were uniformly mixed, and then melt-blended at 240℃for 6 minutes by a twin-screw extruder, and extrusion granulation was carried out at a rotational speed of 100rpm. The formulation of the composition and the test results are shown in Table 1.
Comparative example 5
65 parts by weight of polyglycolic acid PGA-1 and 35 parts by weight of POE8457 were uniformly mixed, and then melt-blended at 240℃for 6 minutes by a twin-screw extruder, and extrusion granulation was carried out at a rotational speed of 100rpm. The formulation of the composition and the test results are shown in Table 1.
Comparative example 6
50 parts by weight of polyglycolic acid PGA-1 and 50 parts by weight of POE8457 were uniformly mixed, and then melt-blended at 240℃for 6 minutes by a twin-screw extruder, and extrusion granulation was carried out at a rotational speed of 100rpm. The formulation of the composition and the test results are shown in Table 1.
TABLE 1
Figure BDA0002639965210000111
Figure BDA0002639965210000121
Table 1 (subsequent)
Figure BDA0002639965210000122
Figure BDA0002639965210000131
As can be seen from the results of examples, comparative examples and Table 1, the composition provided by the invention can be used for toughening and modifying PGA, and the obtained modified polyglycolic acid material has high notch impact strength, obviously improved toughness and good bending property. For example, example 1 has improved melt viscosity, notched impact strength and flexural properties compared to comparative example 3, examples 2, 3, 6-9 compared to comparative example 4, and can have better processability and balanced toughness and flexibility. Example 4 provides a modified polyglycolic acid material having improved toughness as compared to comparative example 5 and example 5 as compared to comparative example 6 while having good flexural properties. The toughness improvement of polyglycolic acid could not be achieved without toughening resins and/or modifiers in comparative examples 1 and 2.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.

Claims (20)

1. A modified polyglycolic acid composition comprising: polyglycolic acid, toughening resin and modifier; the toughening resin is selected from at least one of polyethylene, polypropylene and polyolefin elastomer; the modifier is at least one selected from amino grafted polyolefin, maleic anhydride polyolefin copolymer, maleic anhydride grafted polyolefin elastomer and epoxy compound;
wherein, in the composition, 40-95 parts by weight of polyglycolic acid, 5-60 parts by weight of toughening resin and 0.5-10 parts by weight of modifier are adopted;
wherein the amino grafted polyolefin has a structure represented by formula 1:
Figure FDA0004148339780000011
wherein (1)>
Figure FDA0004148339780000013
The polymer chains shown are polyethylene, polypropylene or polyethylene elastomers; the amino grafted polyolefin has a grafting ratio of 0.2 to 2 wt%;
the grafting ratio of the maleic anhydride grafted polyolefin elastomer is 0.2 to 5 weight percent;
the maleic anhydride polyolefin copolymer has a structure represented by formula 2:
Figure FDA0004148339780000012
r is H, C 1 -C 6 Alkyl, phenyl or C 1 -C 6 Alkoxy, n is an integer of 2 or more.
2. The composition of claim 1, wherein the polyglycolic acid is 50-80 parts by weight, the toughening resin is 20-50 parts by weight, and the modifier is 2-5 parts by weight.
3. The composition according to claim 1 or 2, wherein the polyglycolic acid has a weight average molecular weight of from 5 to 50 tens of thousands.
4. A composition according to claim 3 wherein the polyglycolic acid has a weight average molecular weight of from 10 to 30 tens of thousands.
5. The composition of any of claims 1-2, 4, wherein the composition has a melt viscosity of 1000-50000 Pa-s at 240 ℃.
6. A composition according to claim 3, wherein the melt viscosity of the composition at 240 ℃ is 1000-50000 Pa-s.
7. The composition of any of claims 1-2, 4, 6, wherein the polyethylene has a density of 0.9-0.96g/cm 3 The melt index of the polyethylene at 190 ℃ and a load of 2.16kg is 0.1-15g/10min;
the density of the polypropylene is 0.9-0.96g/cm 3 The melt index of the polypropylene at 230 ℃ and a load of 2.16kg is 0.2-20g/10min;
the polyolefin elastomer is at least one of ethylene and alpha-olefin copolymer, propylene-ethylene copolymer and ethylene propylene diene monomer.
8. The composition of claim 7, wherein the polyolefin elastomer is an ethylene-octene copolymer, a polypropylene-polyethylene block copolymer.
9. A composition according to claim 3, wherein the polyethylene has a density of 0.9-0.96g/cm 3 The melt index of the polyethylene at 190 ℃ and a load of 2.16kg is 0.1-15g/10min;
the density of the polypropylene is 0.9-0.96g/cm 3 The melt index of the polypropylene at 230 ℃ and a load of 2.16kg is 0.2-20g/10min;
the polyolefin elastomer is at least one of ethylene and alpha-olefin copolymer, propylene-ethylene copolymer and ethylene propylene diene monomer.
10. The composition of claim 9, wherein the polyolefin elastomer is an ethylene-octene copolymer, a polypropylene and polyethylene block copolymer.
11. The composition of claim 5, wherein the polyethylene has a density of 0.9-0.96g/cm 3 The melt index of the polyethylene at 190 ℃ and a load of 2.16kg is 0.1-15g/10min;
the density of the polypropylene is 0.9-0.96g/cm 3 The melt index of the polypropylene at 230 ℃ and a load of 2.16kg is 0.2-20g/10min;
the polyolefin elastomer is at least one of ethylene and alpha-olefin copolymer, propylene-ethylene copolymer and ethylene propylene diene monomer.
12. The composition of claim 11, wherein the polyolefin elastomer is an ethylene-octene copolymer, a polypropylene and polyethylene block copolymer.
13. The composition of claim 1, wherein the epoxy compound comprises a copolymer comprising glycidyl methacrylate groups.
14. The composition of claim 13, wherein the epoxy compound is selected from at least one of styrene-acrylonitrile-glycerol methacrylate copolymer, ethylene-methyl acrylate-glycerol methacrylate copolymer, ethylene-ethyl acrylate-glycerol methacrylate copolymer, POE elastomer-glycidyl methacrylate copolymer, styrene-methacrylate-glycerol methacrylate copolymer.
15. A method of preparing a modified polyglycolic acid material comprising:
melt extruding the composition of any one of claims 1-14 to obtain a modified polyglycolic acid material.
16. The method of claim 15, wherein the conditions of melt extrusion comprise: the temperature is 225-250 ℃; the time is 4-10min; the extruder speed was 60-110rpm.
17. The method of claim 16, wherein the conditions of melt extrusion comprise: the temperature is 235-240 ℃; the time is 5-8min; the extruder speed was 80-100rpm.
18. A modified polyglycolic acid material produced by the method of any one of claims 15-17.
19. The material of claim 18, wherein the modified polyglycolic acid material has a notched impact strength of greater than or equal to 4kJ/m 2 And has a flexural modulus of 1.5GPa or more and a flexural strength of 60MPa or more.
20. Use of a material according to claim 18 or 19 in films, cutlery boxes, hollow containers, 3D printing.
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