CN114381102A - Degradable material composition and processing method thereof - Google Patents
Degradable material composition and processing method thereof Download PDFInfo
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- CN114381102A CN114381102A CN202210089422.5A CN202210089422A CN114381102A CN 114381102 A CN114381102 A CN 114381102A CN 202210089422 A CN202210089422 A CN 202210089422A CN 114381102 A CN114381102 A CN 114381102A
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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
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
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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
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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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
- C08L2205/04—Polymer mixtures characterised by other features containing interpenetrating networks
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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
- C08L2312/00—Crosslinking
Abstract
The invention provides a degradable material composition and a processing method thereof, relating to the technical field of degradable materials. The degradable material composition comprises the following raw material components of polylactic acid, epoxidized soybean oil, aminated cage-type polysilsesquioxane and epoxy polyether, wherein the aminated polysilsesquioxane and the epoxidized soybean oil or the epoxy polyether form a slight cross-linked structure, so that the whole degradable material composition forms a structure similar to a semi-interpenetrating polymer network structure, and compared with the method of singly using the epoxidized soybean oil, the cage-type polysilsesquioxane or the polyether as a toughening agent, the degradable material composition has higher mechanical property and heat resistance, and still maintains the good degradation property of the polylactic acid.
Description
Technical Field
The invention belongs to the technical field of degradable materials, and relates to a degradable material composition and a processing method thereof.
Background
Polylactic acid PLA is a completely biodegradable material, but the polylactic acid PLA is brittle and difficult to process, and the processed product also has the characteristic of brittleness, thereby seriously influencing the practical application. Toughening of polylactic acid is an effective method for improving its processability and practicability, and many studies have been made. However, the conventional toughening agent causes partial deterioration of mechanical properties of polylactic acid.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a degradable material composition, and the mechanical property of polylactic acid is enhanced by toughening the polylactic acid through a toughening agent.
The invention also provides a processing method of the degradable material composition.
The technical scheme of the invention is as follows:
a degradable material composition comprising polylactic acid, epoxidized soybean oil and aminated cage polysilsesquioxane (aminated POSS).
In the invention, the weight of the epoxidized soybean oil is 10-30% of the weight of the polylactic acid.
In the invention, the ratio of the mole number of the epoxy groups in the epoxidized soybean oil to the sum of the mole numbers of the primary amino groups and the secondary amino groups in the aminated POSS is 1 (0.001-0.1).
In the present invention, the degradable material composition further comprises at least one of an antioxidant, a processing aid, a pigment and a filler.
In the present invention, the degradable material composition further comprises an epoxy polyether.
In the invention, the weight ratio of the epoxy polyether to the epoxidized soybean oil is (0.05-0.3): 1.
In the invention, the structural general formula of the aminated POSS is R1 aR2 b(SiO1.5)nWherein R is1Selected from C1-C6 alkyl or substituted alkyl, R2Is an organic radical containing primary amino groups, 0 ≤ a ≤ 6, a + b ═ n, n ═ 6, 8, 10 or 12.
In the present invention, R is2Selected from 3-aminopropyl or N-beta-aminoethyl-gamma-aminopropyl.
In the invention, a is more than or equal to 0 and less than or equal to 5, and n is 8.
In the invention, the ratio of the mole number of the epoxy groups in the epoxidized soybean oil to the sum of the mole numbers of the primary amino groups and the secondary amino groups in the aminated POSS is 1 (0.1-0.6).
A processing method of the degradable material composition of any embodiment comprises the steps of mixing, heating, melting and uniformly stirring the raw material components except the aminated POSS, then adding the aminated POSS, uniformly stirring, extruding and molding.
The epoxidized soybean oil is a toughening agent of the polylactic acid, and can obviously improve the mechanical properties of the polylactic acid, such as notch impact strength, elongation at break and the like. According to the invention, epoxidized soybean oil and aminated POSS are adopted, the mole number of primary amino groups and secondary amino groups in the aminated POSS is obviously lower than that of epoxy groups in the epoxidized soybean oil, and the aminated POSS and the epoxidized soybean oil are all polyfunctional group substances, and the amino groups and the epoxy groups can form a slightly crosslinked structure by controlling the mole ratio of the amino groups to the epoxy groups, so that the mechanical properties such as notch impact strength, tensile strength and the like of polylactic acid can be further enhanced on the basis of toughening of the epoxidized soybean oil, and the heat resistance of the polylactic acid can be improved.
When the epoxy polyether is continuously added into the degradable material composition, the epoxy polyether can be a single-end epoxy polyether or a double-end epoxy polyether. When the polyether is a single-end epoxy polyether, the epoxy polyether can react with aminated POSS, a cross-linking structure is not formed, and the toughening capability of polylactic acid can be improved; when the polyether is a double-end epoxy polyether, the epoxy polyether can react with aminated POSS to participate in forming a cross-linked structure. However, due to the difference between the molecular weight and the number of epoxy functional groups of the epoxy polyether and the epoxidized soybean oil, the cross-linking density distribution of the formed cross-linking structure is uneven, and the formed cross-linking structure has a structure similar to 'concentrated cross-linking', so that the toughness of the polylactic acid can be further improved.
In the invention, the polylactic acid and the cross-linked structure form a semi-interpenetrating polymer network structure, which is also beneficial to improving the mechanical property and the heat resistance of the polylactic acid.
The invention has the beneficial effects that:
(1) the invention can obviously improve the mechanical property of the polylactic acid, and has better effect of improving the mechanical property of the polylactic acid compared with singly adopting toughening agents such as epoxidized soybean oil, POSS and the like.
(2) The present invention can improve the heat resistance of polylactic acid due to the presence of POSS and the presence of slightly cross-linked structures.
(3) The slightly crosslinked structure does not affect the processability of the polylactic acid.
(4) The invention adopts epoxidized soybean oil as the main material to toughen, and can still maintain the good biodegradability of polylactic acid.
(5) The polylactic acid and the cross-linked structure form a semi-interpenetrating polymer network structure, so that the degradation speed of the polylactic acid can be properly delayed, and the problem that the conventional polylactic acid or the conventional toughened polylactic acid is degraded too fast in certain occasions is solved.
Detailed Description
The technical solution of the present invention is further illustrated and described by the following detailed description.
The invention provides a degradable material composition which comprises polylactic acid, epoxidized soybean oil and aminated POSS.
The polylactic acid of the present invention has a number average molecular weight of not less than 5 ten thousand, more preferably not less than 8 ten thousand. As the polylactic acid, a homopolymer or a copolymer of L-lactic acid and D-lactic acid can be used.
In a preferred embodiment of the present invention, the weight of the epoxidized soybean oil is 10 to 30% of the weight of the polylactic acid. In a more preferred embodiment of the invention, the weight of epoxidized soybean oil is 12-23% of the weight of polylactic acid. The epoxidized soybean oil is the main toughening agent of the invention, the epoxidized soybean oil is less, and the toughening effect is not obvious; more epoxidized soybean oil has an adverse effect on the mechanical properties of polylactic acid. In the weight range of the epoxidized soybean oil, when the epoxidized soybean oil is less, the epoxidized soybean oil has better compatibility with polylactic acid; when the amount of epoxidized soybean oil is large, it is incompatible with polylactic acid and aggregates to form an island-like structure. In both cases, the properties of the polylactic acid are affected differently, but both have a toughening effect.
In a preferred embodiment of the present invention, the ratio of the number of moles of epoxy groups in the epoxidized soybean oil to the sum of the number of moles of primary and secondary amino groups in the aminated POSS is 1 (0.001-0.1). In a more preferred embodiment of the present invention, the ratio of the number of moles of epoxy groups in the epoxidized soybean oil to the sum of the number of moles of primary and secondary amino groups in the aminated POSS is 1 (0.002-0.08). Since both epoxidized soybean oil and aminated POSS are multifunctional materials, by controlling the molar ratio of epoxy groups to amino groups (including primary and secondary amino groups), a slightly crosslinked structure is formed, i.e., the crosslinking density is low. If the mol number of the aminated POSS is less, a cross-linked structure cannot be formed; when the molar number of the aminated POSS is large, the crosslinking density of the formed crosslinked structure is high, and the processability of the polylactic acid is affected.
In a preferred embodiment of the present invention, the degradable material composition further comprises at least one of an antioxidant, a processing aid, a pigment and a filler.
The antioxidant in the present invention is to improve the antioxidant property of the degradable material composition, and may be selected from antioxidant 1010, antioxidant 1076, antioxidant 1098, and the like. The added weight of the antioxidant can be 0.5-2% of the weight of the polylactic acid.
The processing aid of the present invention is to improve the processability of the degradable material composition, and can be selected from polyethylene wax, oxidized polyethylene wax, stearic acid, zinc stearate, calcium stearate, magnesium stearate, etc. The processing aid may be added in an amount of 0.5 to 1.5% by weight based on the weight of the polylactic acid.
The pigment used in the present invention is intended to improve the apparent color of the degradable material composition and may be selected from inorganic pigments or organic pigments. The added weight of the pigment can be 0.5-5% of the weight of the polylactic acid.
The filler of the invention aims to further improve certain properties of the degradable material composition, and can be selected from talcum powder, silicon micropowder, titanium dioxide, silicon dioxide, calcium carbonate, silicon carbide, silicon nitride, nylon fiber, glass microsphere, glass fiber and the like. The added weight of the filler can be 5-60% of the weight of the polylactic acid.
In a preferred embodiment of the present invention, the degradable material composition further comprises an epoxy polyether. Polyether is also a toughening agent commonly used in the polylactic acid field. The epoxy polyether is adopted in the invention, and can be single-end epoxy polyether, namely only one end of a polyether molecule is an epoxy group, or double-end epoxy polyether, namely two epoxy groups are respectively arranged at two ends of the polyether molecule. The single-end epoxy polyether can react with aminated POSS, a cross-linked structure cannot be formed, and the polylactic acid is still toughened; double-end epoxy group polyether is adopted to react with aminated POSS to form a cross-linked structure, and further the cross-linked structure formed by the double-end epoxy group polyether and the aminated POSS forms a similar effect of concentrated cross-linking due to the difference of cross-linking density (the difference of molecular weight of the double-end epoxy group polyether and the epoxidized soybean oil is obvious and the difference of the number of functional groups), thereby being beneficial to further improving the mechanical property and the heat resistance of the polylactic acid.
In a preferred embodiment of the present invention, the weight ratio of the epoxy-based polyether to epoxidized soybean oil is (0.05-0.3): 1. In a more preferred embodiment of the invention, the weight ratio of epoxy polyether to epoxidized soybean oil is (0.1-0.2): 1.
In a preferred embodiment of the present invention, the aminated POSS has the general structural formula R1 aR2 b(SiO1.5)nWherein R is1Selected from C1-C6 alkyl or substituted alkyl, R2The structure contains primary amino, a is more than or equal to 0 and less than or equal to 6, a + b is equal to n, and n is equal to 6, 8, 10 or 12.
In a more preferred embodiment of the present invention, R is2Selected from 3-aminopropyl or N-beta-aminoethyl-gamma-aminopropyl.
In a more preferred embodiment of the present invention, a is 0. ltoreq. 5, and n is 8. In a further preferred embodiment, a and b are both integers, in particular a is 2, 3, 4 or 5.
In the present invention, the aminated POSS may be octaaminopropyloctameric POSS, pentaisobutyltriaminopropyloctameric POSS, hexamethyldiaminopropyloctameric POSS, or the like.
The invention also provides a processing method of the degradable material composition of any embodiment, which comprises the steps of mixing, heating, melting and uniformly stirring the raw material components except the aminated polysilsesquioxane, then adding the aminated polysilsesquioxane, uniformly stirring, extruding and molding.
In the processing method of the degradable material composition, the temperature for heating and melting is 160-200 ℃, the temperature for extruding is 175-200 ℃, and the molding can be extrusion molding, injection molding or blow molding, or the extruded mixture is subjected to compression molding.
The technical solution of the present invention will be further described and illustrated below with reference to various embodiments. Unless otherwise specified, the parts described in the following examples are parts by weight.
Example 1
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6;
epoxidized soybean oil: epoxy value 6.6g/100 g;
aminated POSS: octa-aminopropyl octa POSS, the ratio of the mole number of epoxy groups in the epoxy soybean oil to the mole number of amino groups in the octa-aminopropyl octa POSS is 1: 0.005;
each raw material was dried in advance. Mixing 100 parts of polylactic acid and 10 parts of epoxidized soybean oil in an extruder, heating to 190 ℃, melting, mixing uniformly, adding octa-amino octa-poly POSS, mixing uniformly, and extruding into slices with the thickness of 2mm at 180 ℃.
Example 2
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6;
epoxidized soybean oil: epoxy value 6.6g/100 g;
aminated POSS: octa-aminopropyl octa POSS, the ratio of the mole number of epoxy groups in the epoxy soybean oil to the mole number of amino groups in the octa-aminopropyl octa POSS is 1: 0.007;
each raw material was dried in advance. Mixing 100 parts of polylactic acid and 10 parts of epoxidized soybean oil in an extruder, heating to 190 ℃, melting, mixing uniformly, adding octa-amino POSS, mixing uniformly, and extruding into slices with the thickness of 2mm at 180 ℃.
Example 3
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6;
epoxidized soybean oil: epoxy value 6.6g/100 g;
aminated POSS: octa-aminopropyl octa POSS, the ratio of the mole number of epoxy groups in the epoxy soybean oil to the mole number of amino groups in the octa-aminopropyl octa POSS is 1: 0.005;
mono-epoxy polyethylene glycol: the EO polymer in the polyethylene glycol is 10, and the weight ratio of the monoepoxy polyethylene glycol to the epoxidized soybean oil is 0.15: 1.
Each raw material was dried in advance. Mixing 100 parts of polylactic acid, 10 parts of epoxidized soybean oil and monoepoxy polyethylene glycol in an extruder, heating to 190 ℃ for melting and mixing uniformly, adding octa-amino octa-poly POSS, mixing uniformly, and extruding into slices with the thickness of 2mm at 180 ℃.
Example 4
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6;
epoxidized soybean oil: epoxy value 6.6g/100 g;
aminated POSS: octa-aminopropyl octa POSS, the ratio of the mole number of epoxy groups in the epoxy soybean oil to the mole number of amino groups in the octa-aminopropyl octa POSS is 1: 0.005;
epoxy-terminated polyethylene glycol: the EO polymer in the polyethylene glycol is 10, and the weight ratio of the epoxy-terminated polyethylene glycol to the epoxidized soybean oil is 0.15: 1.
Each raw material was dried in advance. Mixing 100 parts of polylactic acid, 10 parts of epoxidized soybean oil and double-end epoxy group polyethylene glycol in an extruder, heating to 190 ℃, melting, mixing uniformly, adding octa-amino octa-poly POSS, mixing uniformly, and extruding into slices with the thickness of 2mm at 180 ℃.
Example 5
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6;
epoxidized soybean oil: epoxy value 6.6g/100 g;
aminated POSS: octa-aminopropyl octa POSS, the ratio of the mole number of epoxy groups in the epoxy soybean oil to the mole number of amino groups in the octa-aminopropyl octa POSS is 1: 0.008;
each raw material was dried in advance. Mixing 100 parts of polylactic acid and 20 parts of epoxidized soybean oil in an extruder, heating to 190 ℃, melting, mixing uniformly, adding octa-amino octa-poly POSS, mixing uniformly, and extruding into slices with the thickness of 2mm at 180 ℃.
Example 6
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6;
epoxidized soybean oil: epoxy value 6.6g/100 g;
aminated POSS: octa-aminopropyl octa POSS, the ratio of the mole number of epoxy groups in the epoxy soybean oil to the mole number of amino groups in the octa-aminopropyl octa POSS is 1: 0.006;
each raw material was dried in advance. Mixing 100 parts of polylactic acid and 20 parts of epoxidized soybean oil in an extruder, heating to 190 ℃, melting, mixing uniformly, adding octa-amino octa-poly POSS, mixing uniformly, and extruding into slices with the thickness of 2mm at 180 ℃.
Example 7
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6;
epoxidized soybean oil: epoxy value 6.6g/100 g;
aminated POSS: octa-aminopropyl octa POSS, the ratio of the mole number of epoxy groups in the epoxy soybean oil to the mole number of amino groups in the octa-aminopropyl octa POSS is 1: 0.006;
mono-epoxy polyethylene glycol: the EO polymer in the polyethylene glycol is 10, and the weight ratio of the monoepoxy polyethylene glycol to the epoxidized soybean oil is 0.2: 1.
Each raw material was dried in advance. Mixing 100 parts of polylactic acid, 20 parts of epoxidized soybean oil and monoepoxy polyethylene glycol in an extruder, heating to 190 ℃ for melting and mixing uniformly, adding octa-amino octa-poly POSS, mixing uniformly, and extruding into slices with the thickness of 2mm at 180 ℃.
Example 8
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6;
epoxidized soybean oil: epoxy value 6.6g/100 g;
aminated POSS: octa-aminopropyl octa POSS, the ratio of the mole number of epoxy groups in the epoxy soybean oil to the mole number of amino groups in the octa-aminopropyl octa POSS is 1: 0.01;
epoxy-terminated polyethylene glycol: the EO polymer in the polyethylene glycol is 10, and the weight ratio of the epoxy-terminated polyethylene glycol to the epoxidized soybean oil is 0.2: 1.
Each raw material was dried in advance. Mixing 100 parts of polylactic acid, 20 parts of epoxidized soybean oil and double-end epoxy group polyethylene glycol in an extruder, heating to 190 ℃, melting, mixing uniformly, adding octa-amino octa-poly POSS, mixing uniformly, and extruding into slices with the thickness of 2mm at 180 ℃.
Example 9
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6;
epoxidized soybean oil: epoxy value 6.6g/100 g;
aminated POSS: hexamethyl diamino propyl octa POSS, the ratio of the mole number of epoxy groups in the epoxy soybean oil to the mole number of amino groups in the hexamethyl diamino propyl octa POSS is 1: 0.03;
each raw material was dried in advance. 100 parts of polylactic acid, 15 parts of epoxidized soybean oil, 1.5 parts of antioxidant 1010 and 30 parts of silica micropowder (KH-560 silane coupling agent pretreated) with the average particle size of 5 microns are mixed in an extruder, heated to 195 ℃ to be melted and mixed uniformly, added with hexamethyl-diamino-propyl octa POSS to be mixed uniformly, and extruded into slices with the thickness of 2mm at 185 ℃.
Example 10
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6;
epoxidized soybean oil: epoxy value 6.6g/100 g;
aminated POSS: hexamethyl diamino propyl octa POSS, the ratio of the mole number of epoxy groups in the epoxy soybean oil to the mole number of amino groups in the hexamethyl diamino propyl octa POSS is 1: 0.05;
epoxy-terminated polyethylene glycol: the EO polymer in the polyethylene glycol is 10, and the weight ratio of the epoxy-terminated polyethylene glycol to the epoxidized soybean oil is 0.12: 1.
Each raw material was dried in advance. Mixing 100 parts of polylactic acid, 15 parts of epoxidized soybean oil, double-end epoxy group polyethylene glycol, 1.5 parts of antioxidant 1010 and 30 parts of silica micropowder (KH-560 silane coupling agent pretreated) with the average particle size of 5 microns in an extruder, heating to 195 ℃, melting and uniformly mixing, adding hexamethyl-diamino-propyl octa-poly POSS, uniformly mixing, and extruding into slices with the thickness of 2mm at 180 ℃.
Comparative example 1
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6.
The polylactic acid is dried in advance. The polylactic acid was melted by heating to 190 ℃ in an extruder and extruded into a sheet of 2mm thickness at 180 ℃.
Comparative example 2
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6;
epoxidized soybean oil: epoxy value 6.6g/100 g;
each raw material was dried in advance. 100 parts of polylactic acid and 10 parts of epoxidized soybean oil are mixed in an extruder, heated to 190 ℃ to be melted and uniformly mixed, and extruded into a sheet with the thickness of 2mm at 180 ℃.
Comparative example 3
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6;
epoxidized soybean oil: epoxy value 6.6g/100 g;
each raw material was dried in advance. 100 parts of polylactic acid and 20 parts of epoxidized soybean oil are mixed in an extruder, heated to 190 ℃ to be melted and uniformly mixed, and extruded into slices with the thickness of 2mm at 180 ℃.
Comparative example 4
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6;
each raw material was dried in advance. 100 parts of polylactic acid and 2 parts of octaaminopropyl octapoly POSS are mixed in an extruder, heated to 190 ℃ to be melted and mixed uniformly, and extruded into slices with the thickness of 2mm at 180 ℃.
Comparative example 5
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6;
each raw material was dried in advance. 100 parts of polylactic acid and 5 parts of octaaminopropyl octapoly POSS are mixed in an extruder, heated to 190 ℃ to be melted and mixed uniformly, and extruded into sheets with the thickness of 2mm at 180 ℃.
Comparative example 6
Polylactic acid: PLLA, number average molecular weight 11 ten thousand, molecular weight distribution 1.6;
epoxidized soybean oil: epoxy value 6.6g/100 g;
each raw material was dried in advance. 100 parts of polylactic acid, 15 parts of epoxidized soybean oil and 30 parts of silica micropowder (pretreated with KH-560 silane coupling agent) are mixed in an extruder, heated to 190 ℃ to be melted and uniformly mixed, and extruded at 180 ℃ into a sheet with the thickness of 2 mm.
The sheets obtained in examples 1 to 10 and comparative examples 1 to 6 were subjected to a tensile test in accordance with GB/T1040-2018. The sheet was left at 80 ℃ for 4 hours before the test, taken out, and cooled at room temperature for 24 hours.
The sheets obtained in examples 1 to 10 and comparative examples 1 to 6 were subjected to impact strength tests in accordance with GB/T1843-2088, using notched test specimens. The sheet was left at 80 ℃ for 4 hours before the test, taken out, and cooled at room temperature for 24 hours.
And (3) heat resistance test: the sheets obtained in examples 1 to 10 and comparative examples 1 to 6 were tested for heat distortion temperature. The sheet was left at 80 ℃ for 4 hours before the test, taken out, and cooled at room temperature for 24 hours.
The results are shown in Table 1.
TABLE 1
Therefore, as shown in the data results of table 1, the mechanical properties and heat resistance of the degradable material obtained after the processing of the degradable material composition of the present invention are better than those of the degradable material obtained by adding the toughening agent alone, which indicates that the toughening agent forms a slightly crosslinked structure to improve the mechanical properties and heat resistance of the polylactic acid.
The foregoing has shown and described the fundamental principles, principal features and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the foregoing embodiments, which are merely preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, and that equivalent changes and modifications made within the scope of the present invention and the specification should be covered thereby. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The degradable material composition is characterized by comprising the following raw material components of polylactic acid, epoxidized soybean oil and aminated cage type polysilsesquioxane.
2. The degradable material composition of claim 1, wherein the weight of the epoxidized soybean oil is 10-30% of the weight of the polylactic acid.
3. The degradable material composition of claim 1, wherein the ratio of the mole number of epoxy groups in the epoxidized soybean oil to the sum of the mole numbers of primary and secondary amino groups in the aminated cage-type polysilsesquioxane is 1 (0.001-0.1).
4. The degradable material composition of claim 1 further comprising at least one of the following raw material components, antioxidants, processing aids, pigments and fillers.
5. The degradable material composition of claim 1 further comprising an epoxy polyether.
6. The degradable material composition of claim 5, wherein the weight ratio of the epoxy polyether to the epoxidized soybean oil is (0.05-0.3): 1.
7. The degradable material composition of claim 1, wherein the structural formula of the aminated cage-type polysilsesquioxane is R1 aR2 b(SiO1.5)nWherein R is1Selected from C1-C6 alkyl or substituted alkyl, R2Is an organic radical containing primary amino groups, 0 ≤ a ≤ 6, a + b ═ n, n ═ 6, 8, 10 or 12.
8. The degradable material composition of claim 7, said R2Selected from 3-aminopropyl or N-beta-aminoethyl-gamma-aminopropyl.
9. The degradable material composition of claim 7 wherein 0 ≦ a ≦ 5 and n ≦ 8.
10. A method for processing the degradable material composition according to any one of claims 1 to 9, wherein the raw material components other than the aminated cage-type polysilsesquioxane are mixed, heated to melt, stirred uniformly, added with the aminated polysilsesquioxane, stirred uniformly, extruded and molded.
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