CN112080115B - High-toughness polylactic acid composite material for environment-friendly tableware and preparation method thereof - Google Patents
High-toughness polylactic acid composite material for environment-friendly tableware 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
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- C08L2205/00—Polymer mixtures characterised by other features
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- C08L2205/00—Polymer mixtures characterised by other features
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Abstract
The invention discloses a high-toughness polylactic acid composite material for environment-friendly tableware and a preparation method thereof, and relates to the technical field of polylactic acid composite materials. The invention discloses a high-toughness polylactic acid composite material for environment-friendly tableware, which comprises the following raw materials in percentage by mass: 40-65 parts of modified polylactic acid, 35-60 parts of adipic acid modified plant fiber, 0.5-1 part of sodium abietate, 8-15 parts of polyethylene glycol, 0.5-0.8 part of magnesium aluminum silicate and 2-5 parts of lubricant. The high-toughness polylactic acid composite material provided by the invention has excellent impact resistance, can resist high temperature, has a thermal deformation temperature of over 115 ℃, has excellent mechanical properties, high toughness, is not easy to brittle failure, prolongs the service life, is nontoxic, can be completely biodegraded, and can be widely applied to the fields of environment-friendly tableware, food packaging and the like.
Description
Technical Field
The invention belongs to the technical field of polylactic acid composite materials, and particularly relates to a high-toughness polylactic acid composite material for environment-friendly tableware and a preparation method thereof.
Background
Today, the environment-friendly biodegradable polymer material is not easily favored by people and becomes a research hotspot in recent years, while the polylactic acid is considered to be one of the most promising traditional plastic substitutes. Polylactic acid (PLA) is biodegradable aliphatic polyester prepared by taking lactic acid formed by fermenting corn or potato starch as a raw material through chemical synthesis, has sufficient and renewable raw material sources, not only gets rid of the dependence on petroleum resources, but also has lower energy consumption in the production and manufacturing process than petroleum-based polymers such as PP and the like, and is a polymer material with low environmental load.
PLA is a linear aliphatic polyester which is green, environment-friendly and fully biodegradable. With the increasing prominence of environmental problems such as white pollution and plastic incineration, PLA has become a research hotspot of a plurality of researchers due to excellent mechanical properties (high strength, high modulus and the like) and full biodegradability. However, in the practical application process, the PLA product is not completely applied in the daily life field, mainly because of the disadvantages of PLA itself, such as high brittleness, long degradation period, low crystallinity, and heat resistance. Firstly, the application of PLA in the fields of environment-friendly tableware, films, packaging materials and the like is limited due to the large brittleness and poor impact resistance; meanwhile, low crystallinity and poor heat resistance are important factors for limiting the application of the PLA in the fields of heat-resistant and high-temperature-resistant products. The heat distortion temperature of PLA is only about 55-60 ℃, however, when the PLA is used as environment-friendly tableware, the temperature of food can reach about 100 ℃, the use of the PLA as the environment-friendly tableware is severely limited, and the service life is short. The existing PLA material can be recycled as polymer environment-friendly tableware, but the PLA material is brittle and easy to break in the using process and short in service life, so that the PLA material is limited to be applied as universal environment-friendly tableware in family life and is mainly used as disposable tableware at present.
At present, many studies and reports have been made on modification of polylactic acid. The Chinese invention patent CN105968757B discloses a full-biodegradable toughened high-strength polylactic acid-based composite material and a preparation method thereof, the composite material is prepared by drying and mixing polylactic acid, epoxidized vegetable oil or derivatives thereof and a peroxidation initiator, and then carrying out in-situ graft crosslinking reaction in an internal mixer, wherein each component of the composite material is a non-toxic and biodegradable material, and a graft crosslinking structure is introduced to ensure that the composite material is toughened in response and keeps high strength. Although the strength and the elongation at break of the polylactic acid composite material are improved through the grafting reaction, the polylactic acid composite material has low impact strength, is easy to crack and has poor heat resistance, and the application of the polylactic acid composite material in environment-friendly tableware is influenced. The Chinese invention patent CN103965596B discloses a biodegradable polylactic acid composite material and application, the composite material is prepared by mixing and granulating polylactic acid with weight average molecular weight of 10-18 ten thousand and molecular weight distribution index of 1.2-2.0, aliphatic polyester, plasticizer and inorganic filler for surface treatment, the composite material has excellent tensile strength and elongation at break, and the cost is lower. However, the impact strength of the composite material is poor, and the heat resistance is not obviously modified, so that the composite material is not suitable for being applied to environment-friendly tableware.
Disclosure of Invention
The invention aims to provide a high-toughness polylactic acid composite material, which has excellent impact resistance, can resist high temperature, has a thermal deformation temperature of over 115 ℃, has excellent mechanical properties, has high toughness, is not easy to brittle fracture and prolongs the service life. The composite material is non-toxic and completely biodegradable, and can be widely applied to the fields of environment-friendly tableware, food packaging and the like.
In order to realize the purpose of the invention, the invention provides a high-toughness polylactic acid composite material for environment-friendly tableware, which is prepared from the following raw materials in parts by weight: 40-65 parts of modified polylactic acid, 35-60 parts of adipic acid modified plant fiber, 0.5-1 part of sodium abietate, 8-15 parts of polyethylene glycol, 0.5-0.8 part of magnesium aluminum silicate and 2-5 parts of lubricant.
Further, the preparation method of the modified polylactic acid comprises the following specific steps:
(1) adding silicon dioxide powder into toluene, heating to 60 ℃, uniformly stirring, then adding vinyl trimethoxy silane, slowly heating to 110 ℃, and stirring for 3-4h to prepare surface modified silicon dioxide;
(2) adding the surface-modified silicon dioxide and polylactic acid into a high-speed mixer, setting the stirring temperature to be 100 ℃, setting the stirring speed to be 250-one-step at 300r/min, then adding tricresyl phosphate, stirring for 0.5h, then adding the mixture into a double-screw extruder for melt blending, extruding and granulating to obtain PLA/SiO2The compound, namely the modified polylactic acid.
Further, the addition amount of the vinyltrimethoxysilane in the step (1) is 1.2-2.5wt% of the silicon dioxide powder, and the addition amount of the toluene is 4 times of the mass of the silicon dioxide powder.
Further, the addition amount of the surface-modified silica in the step (2) is 4.5-7.5wt% of the polylactic acid, and the addition amount of tricresyl phosphate is 3-5wt% of the polylactic acid.
Further, the preparation method of the adipic acid modified plant fiber comprises the following specific steps: adding the plant fiber and dichloromethane into a reaction kettle, stirring uniformly, then adding adipic acid, BPO and aminopropyltriethoxysilane, stirring for 1.5-2h, then heating to 50 ℃, stirring for 1-2h, washing with deionized water for three times, then carrying out vacuum filtration, and drying to obtain the adipic acid modified plant fiber.
Furthermore, the addition amount of the adipic acid is 3.5-4.5wt% of the plant fiber, the addition amount of the BPO is 0.3-0.5wt% of the plant fiber, the addition amount of the aminopropyltriethoxysilane is 1.2-1.5wt% of the plant fiber, and the addition amount of the dichloromethane is 3-5 times of the mass of the plant fiber.
Further, the average molecular weight of the polyethylene glycol is 3600-8500, and the polyethylene glycol is one or two of PEG-4000, PEG-6000 and PEG-8000.
Further, the lubricant is one or two of polyethylene wax, N-ethylene bis stearamide, glycerol tristearate and N-butyl stearate.
The preparation method of the high-toughness polylactic acid composite material for the environment-friendly tableware comprises the following specific steps: adding weighed modified polylactic acid, adipic acid modified plant fiber and polyethylene glycol into a high-speed mixer, uniformly stirring, adding sodium abietate, stirring for 0.5-1h, adding magnesium aluminum silicate and a lubricant, stirring for 10-15min, adding the uniformly stirred mixed material into a double-screw extruder, melting and blending, extruding, bracing and granulating to obtain the high-toughness polylactic acid composite material for the environment-friendly tableware.
Further, the extrusion temperature of the double-screw extruder is 150-: 1.
the invention achieves the following beneficial effects:
1. the modified polylactic acid is prepared by crosslinking and compounding surface-modified silicon dioxide and polylactic acid under the action of a coupling agent, and the silicon dioxide and the polylactic acid are crosslinked, so that the spherulite size of PLA is reduced, the crystallization rate is increased, the crystallization temperature and the crystallinity are increased, and the heat resistance of the PLA is improved; according to the invention, the surface of the silicon dioxide is modified, so that the crosslinking degree between PLA and the silicon dioxide is improved, the interface bonding force of the modified polylactic acid is improved, and the compatibility of the modified polylactic acid is enhanced, so that the impact resistance of the polylactic acid composite material is improved; the strength of the modified polylactic acid is greatly improved due to the addition of the silicon dioxide.
2. The plant fiber is grafted and modified by the adipic acid, so that the interface compatibility between the plant fiber and the modified polylactic acid is enhanced, the toughness and the strength of the polylactic acid composite are improved, and the impact strength of the polylactic acid composite is improved. The invention also improves the interface bonding force of the modified polylactic acid and the plant fiber by adding the sodium abietate, improves the compatibility of the two, improves the toughness of the polylactic acid composite material, and further improves the heat resistance of the polylactic acid composite material due to the addition of the adipic acid modified plant fiber.
3. The modified polylactic acid, the adipic acid modified plant fiber and the polyethylene glycol are mixed, so that the adipic acid modified plant fiber can be uniformly dispersed in a modified polylactic acid matrix, the compatibility of the adipic acid modified plant fiber and the modified polylactic acid is increased, and the toughness of the polylactic acid composite material is improved.
4. The magnesium aluminum silicate has excellent lubricity, can improve the processability of polylactic acid, has excellent hydrophilic capacity, can improve the hydrophilic capacity of the polylactic acid composite material, has excellent organic matter degradation performance, can carry out oxidative degradation on oily organic matters so as to be easily taken away by water, and ensures that environment-friendly tableware prepared from the polylactic acid composite material is easy to clean.
5. The average molecular weight of the polyethylene glycol is selected from 3600-8500, so that the strength, toughness and heat resistance of the polylactic acid composite material can be improved. If the average molecular weight of the polyethylene glycol is less than 3600, the crystallization temperature of the polylactic acid composite material is reduced, the crystallinity is reduced, but the plasticizing effect is obvious, namely, the tensile strength and the heat resistance are reduced, and the toughness is enhanced; if the average molecular weight of the polyethylene glycol is more than 8500, the crystallization temperature of the polylactic acid composite material increases, the crystallinity increases, but the plasticizing effect is lowered, that is, the tensile strength and heat resistance are improved, and the toughness is poor.
6. The polylactic acid is modified by using the plant fiber, the raw materials are easy to obtain, the cost is low, the polylactic acid can be completely biodegraded, and the polylactic acid modified by the plant fiber is in line with the environment-friendly development trend.
7. According to the invention, the polylactic acid is modified by adopting silicon dioxide, and the average molecular weight of polyethylene glycol is controlled to blend with the raw materials such as sodium abietate and lubricant, so that the polylactic acid composite material is prepared, and the composite material has excellent impact resistance, can resist high temperature, has a thermal deformation temperature of over 115 ℃, has excellent mechanical properties, is high in toughness, is not easy to brittle failure, and prolongs the service life. The polylactic acid composite material prepared by the method has the advantages of easily available raw materials, low cost, no toxicity and degradability, and can be completely biodegraded. The preparation method disclosed by the invention is easy to control, strong in operability and easy for industrial production, and can be widely applied to the fields of food packaging, environment-friendly tableware and the like.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be described with reference to specific examples, and the preparation method of the present invention is described below.
The plant fiber in the invention is derived from one or more of plant straw, bamboo, cotton, algae and aquatic weeds.
The average molecular weight of the polyethylene glycol in the invention is selected from 3600-8500, and is not limited to PEG-4000, PEG-6000 and PEG-8000 provided by the invention.
Example 1
A high-toughness polylactic acid composite material for environment-friendly tableware is composed of the following raw materials in parts by weight: 40 parts of modified polylactic acid, 60 parts of adipic acid modified plant fiber, 1 part of sodium abietate, PEG-400015 parts, 0.8 part of magnesium aluminum silicate and 2 parts of N, N-ethylene bis stearamide, and the preparation method comprises the following steps:
adding weighed modified polylactic acid, adipic acid modified plant fiber and PEG-4000 into a high-speed mixer, uniformly stirring, adding sodium abietate, stirring for 0.5-1h, then adding magnesium aluminum silicate and N, N-ethylene bis-stearamide, stirring for 10-15min, adding the uniformly stirred mixed materials into a double-screw extruder, melting and blending, extruding, bracing and granulating to obtain the high-toughness polylactic acid composite material for the environment-friendly tableware. Wherein the extrusion temperature of the double-screw extruder is 150-: 1.
the preparation method of the modified polylactic acid comprises the following specific steps:
(1) adding 100 parts of silicon dioxide powder into 400 parts of toluene, heating to 60 ℃, uniformly stirring, then adding 2.5 parts of vinyl trimethoxy silane, slowly heating to 110 ℃, and stirring for 3-4 hours to prepare surface modified silicon dioxide;
(2) adding 7.5 parts of the surface modified silicon dioxide and 100 parts of polylactic acid into a high-speed mixer, setting the stirring temperature at 100 ℃, setting the stirring speed at 250-300r/min, then adding 5 parts of tricresyl phosphate, stirring for 0.5h, then adding the mixture into a double-screw extruder for melt blending, extruding and granulating to obtain PLA/SiO2Compounding to obtain the modified polylactic acid.
The preparation method of the adipic acid modified plant fiber comprises the following specific steps: adding 100 parts of plant fiber and 500 parts of dichloromethane into a reaction kettle, uniformly stirring, then adding 4.5 parts of adipic acid, 0.5 part of BPO and 1.2 parts of aminopropyltriethoxysilane, stirring for 1.5-2h, then heating to 50 ℃, stirring for 1-2h, washing with deionized water for three times, carrying out vacuum filtration, and drying to obtain the adipic acid modified plant fiber.
Example 2
A high-toughness polylactic acid composite material for environment-friendly tableware is composed of the following raw materials in parts by weight: 65 parts of modified polylactic acid, 35 parts of adipic acid modified plant fiber, 0.5 part of sodium abietate, PEG-60008 parts, 0.5 part of magnesium aluminum silicate and 5 parts of polyethylene wax, wherein the preparation method is the same as that in example 1, and specifically, the preparation method refers to example 1, except that PEG-4000 is replaced by PEG-6000, N, N, ethylene bis-stearamide (namely a lubricant) is replaced by polyethylene wax.
The preparation method of the modified polylactic acid comprises the following specific steps:
(1) adding 100 parts of silicon dioxide powder into 400 parts of toluene, heating to 60 ℃, uniformly stirring, then adding 1.8 parts of vinyl trimethoxy silane, slowly heating to 110 ℃, and stirring for 3-4 hours to prepare surface modified silicon dioxide;
(2) adding the 5 parts of the surface modified silicon dioxide and 100 parts of polylactic acid into a high-speed mixer, setting the stirring temperature at 100 ℃ and the stirring speed at 250-2Compounding to obtain the modified polylactic acid.
The preparation method of the adipic acid modified plant fiber comprises the following specific steps: adding 100 parts of plant fiber and 300 parts of dichloromethane into a reaction kettle, stirring uniformly, then adding 3.5 parts of adipic acid, 0.3 part of BPO and 1.5 parts of aminopropyltriethoxysilane, stirring for 1.5-2h, then heating to 50 ℃, stirring for 1-2h, washing with deionized water for three times, decompressing, filtering, and drying to obtain the adipic acid modified plant fiber.
Example 3
A high-toughness polylactic acid composite material for environment-friendly tableware is composed of the following raw materials in parts by weight: 50 parts of modified polylactic acid, 50 parts of adipic acid modified plant fiber, 0.8 part of sodium abietate, 0.05 part of PEG-40005 part of PEG-80005 part of magnesium aluminum silicate and 4 parts of glycerol tristearate, the preparation method is the same as that of example 1, and specifically, with reference to example 1, PEG-4000 is replaced by PEG-4000 and PEG-8000, and N, N, -ethylene bis-stearamide (i.e., a lubricant) is replaced by glycerol tristearate.
The preparation method of the modified polylactic acid comprises the following specific steps:
(1) adding 100 parts of silicon dioxide powder into 400 parts of toluene, heating to 60 ℃, uniformly stirring, then adding 1.2 parts of vinyl trimethoxy silane, slowly heating to 110 ℃, and stirring for 3-4 hours to prepare surface modified silicon dioxide;
(2) adding the 4.5 parts of the surface modified silicon dioxide and 100 parts of polylactic acid into a high-speed mixer, setting the stirring temperature at 100 ℃ and the stirring speed at 250-300r/min, then adding 4 parts of tricresyl phosphate, stirring for 0.5h, then adding the mixture into a double-screw extruder, and carrying out melt blending, extrusion and granulation to obtain PLA/SiO2Compounding to obtain the modified polylactic acid.
The preparation method of the adipic acid modified plant fiber comprises the following specific steps: adding 100 parts of plant fiber and 400 parts of dichloromethane into a reaction kettle, uniformly stirring, then adding 4 parts of adipic acid, 0.4 part of BPO and 1.3 parts of aminopropyltriethoxysilane, stirring for 1.5-2h, then heating to 50 ℃, stirring for 1-2h, washing with deionized water for three times, decompressing, filtering, and drying to obtain the adipic acid modified plant fiber.
Example 4
A high-toughness polylactic acid composite material for environment-friendly tableware is composed of the following raw materials in parts by weight: 54 parts of modified polylactic acid, 46 parts of adipic acid modified plant fiber, 0.7 part of sodium abietate, PEG-600012 parts, 0.7 part of magnesium aluminum silicate and 3 parts of N-butyl stearate, wherein the preparation method is the same as that in example 1, and specifically, the difference is that PEG-4000 is replaced by PEG-6000, N, N, ethylene bis-stearamide (namely, a lubricant) is replaced by N-butyl stearate.
The preparation method of the modified polylactic acid comprises the following specific steps:
(1) adding 100 parts of silicon dioxide powder into 400 parts of toluene, heating to 60 ℃, uniformly stirring, then adding 2 parts of vinyl trimethoxy silane, slowly heating to 110 ℃, and stirring for 3-4 hours to obtain surface modified silicon dioxide;
(2) adding the 6 parts of the surface modified silicon dioxide and 100 parts of polylactic acid into a high-speed mixer, setting the stirring temperature at 100 ℃ and the stirring speed at 250-300r/min, then adding 4 parts of tricresyl phosphate, stirring for 0.5h, then adding the mixture into a double-screw extruder, and carrying out melt blending, extrusion and granulation to obtain PLA/SiO2Compounding to obtain the modified polylactic acid.
The preparation method of the adipic acid modified plant fiber comprises the following specific steps: adding 100 parts of plant fiber and 400 parts of dichloromethane into a reaction kettle, uniformly stirring, then adding 3.8 parts of adipic acid, 0.4 part of BPO and 1.4 parts of aminopropyltriethoxysilane, stirring for 1.5-2h, then heating to 50 ℃, stirring for 1-2h, washing with deionized water for three times, decompressing, filtering, and drying to obtain the adipic acid modified plant fiber.
Comparative example 1
The raw materials and the preparation method of the polylactic acid composite material are the same as those in the embodiment 4, and the embodiment 4 is specifically referred. The only difference is that no surface-modified silica was added to the modified polylactic acid in this comparative example.
Comparative example 2
The raw materials and the preparation method of the polylactic acid composite material are the same as those in the embodiment 4, and the embodiment 4 is specifically referred. The only difference is that the plant fibers in this comparative example were not adipic acid modified.
Comparative example 3
The raw materials and the preparation method of the polylactic acid composite material are the same as those in the embodiment 4, and the embodiment 4 is specifically referred. The only difference was that no sodium abietate was added in this comparative example.
Comparative example 4
The raw materials and the preparation method of the polylactic acid composite material are the same as those in the embodiment 4, and the embodiment 4 is specifically referred. The only difference is that no magnesium aluminum silicate was added in this comparative example.
The above examples 1 to 4 and comparative examples 1 to 4 were subjected to the performance test, and the test results thereof are shown in the following table 1.
TABLE 1 detection results of the properties of the polylactic acid composite materials of examples 1-4 and comparative examples 1-4
As shown in the detection result table of the polylactic acid composite material in the table 1, the polylactic acid composite material has good mechanical property and toughness, the tensile strength is 91.7-114.6MPa, and the impact strength is 27.4-40.2kJ/m2The elongation at break is 164.7-451.5%, the thermal deformation temperature is above 115 ℃, and the high-temperature resistance is good. When polylactic acid is modified by silicon dioxide, the strength, toughness and high temperature resistance of the polylactic acid composite material are improved; after the plant fiber is modified by the adipic acid, the strength, the toughness and the high-temperature resistance of the polylactic acid composite material are improved; when the polylactic acid composite material is added with sodium abietate or magnesium aluminum silicate, the strength, toughness and high temperature resistance of the polylactic acid composite material are correspondingly improved.
Comparative example 5
A polylactic acid polymer material, the starting materials and the production method thereof are the same as those in example 4, with specific reference to example 4. The only difference was that in this comparative example PEG-2000 was used as the polyethylene glycol.
Comparative example 6
A polylactic acid polymeric material, the raw materials and the preparation method thereof are the same as in example 4, with specific reference to example 4. The only difference was that PEG-10000 was used as the polyethylene glycol in this comparative example.
The above example 4 and comparative examples 5 to 6 were subjected to the performance test, and the test results thereof are shown in the following table 2.
TABLE 2 detection results of the properties of the polylactic acid composite materials of example 4 and comparative examples 5 to 6
As can be seen from the detection result table of the polylactic acid composite material in Table 2, the average molecular weight of the polyethylene glycol is selected between 3600-8500, so that the strength, toughness and heat resistance of the polylactic acid composite material can be improved.
All possible combinations of the technical features of the embodiments described above may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (8)
1. The high-toughness polylactic acid composite material for the environment-friendly tableware is characterized by comprising the following raw materials in parts by weight: 40-65 parts of modified polylactic acid, 35-60 parts of adipic acid modified plant fiber, 0.5-1 part of sodium abietate, 8-15 parts of polyethylene glycol, 0.5-0.8 part of magnesium aluminum silicate and 2-5 parts of lubricant;
the preparation method of the modified polylactic acid comprises the following specific steps:
(1) adding silicon dioxide powder into toluene, heating to 60 ℃, uniformly stirring, then adding vinyl trimethoxy silane, slowly heating to 110 ℃, and stirring for 3-4h to prepare surface modified silicon dioxide;
(2) adding the surface-modified silicon dioxide and polylactic acid into a high-speed mixer, setting the stirring temperature to be 100 ℃, setting the stirring speed to be 250-one-step at 300r/min, then adding tricresyl phosphate, stirring for 0.5h, then adding the mixture into a double-screw extruder for melt blending, extruding and granulating to obtain PLA/SiO2A complex, i.e. the modified polylactic acid;
the preparation method of the adipic acid modified plant fiber comprises the following specific steps: adding the plant fiber and dichloromethane into a reaction kettle, stirring uniformly, then adding adipic acid, BPO and aminopropyltriethoxysilane, stirring for 1.5-2h, then heating to 50 ℃, stirring for 1-2h, washing with deionized water for three times, then carrying out vacuum filtration, and drying to obtain the adipic acid modified plant fiber.
2. The high toughness polylactic acid composite material for tableware according to claim 1, wherein said vinyltrimethoxysilane is added in an amount of 1.2 to 2.5wt% based on the weight of said silica powder in said step (1), and said toluene is added in an amount of 4 times the weight of said silica powder.
3. The high toughness polylactic acid composite for tableware according to claim 1, wherein said surface modified silica is added in an amount of 4.5 to 7.5wt% and said tricresyl phosphate is added in an amount of 3 to 5wt% based on said polylactic acid in said step (2).
4. The high toughness polylactic acid composite material for environmental friendly tableware according to claim 1, wherein said adipic acid is added in an amount of 3.5 to 4.5wt% of said plant fiber, said BPO is added in an amount of 0.3 to 0.5wt% of said plant fiber, said aminopropyltriethoxysilane is added in an amount of 1.2 to 1.5wt% of said plant fiber, and said dichloromethane is added in an amount of 3 to 5 times the mass of said plant fiber.
5. The high-toughness polylactic acid composite material for the environment-friendly tableware according to claim 1, wherein the average molecular weight of the polyethylene glycol is 3600-.
6. The high-toughness polylactic acid composite material for environmentally friendly tableware according to claim 1, wherein said lubricant is one or two of polyethylene wax, N, -ethylene bis stearamide, glycerol tristearate, and N-butyl stearate.
7. A method for preparing the high-toughness polylactic acid composite material for the environment-friendly tableware according to any one of claims 1 to 6, which comprises the following specific steps: adding weighed modified polylactic acid, adipic acid modified plant fiber and polyethylene glycol into a high-speed mixer, uniformly stirring, adding sodium abietate, stirring for 0.5-1h, adding magnesium aluminum silicate and a lubricant, stirring for 10-15min, adding the uniformly stirred mixed material into a double-screw extruder, melting and blending, extruding, bracing and granulating to obtain the high-toughness polylactic acid composite material for the environment-friendly tableware.
8. The method for preparing the high-toughness polylactic acid composite material for the environment-friendly tableware according to claim 7, wherein the extrusion temperature of the double-screw extruder is 150-: 1.
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| CN113969045A (en) * | 2021-10-08 | 2022-01-25 | 江西春光新材料科技股份有限公司 | Composite material and preparation method thereof |
| CN114410091B (en) * | 2022-01-27 | 2023-10-17 | 万华化学（宁波）有限公司 | High-temperature-resistant impact-resistant high-strength modified polylactic acid material and preparation method thereof |
| CN115322566B (en) * | 2022-09-16 | 2023-09-29 | 无锡腾达精密模塑有限公司 | PA 66-based composite material for motor bearing retainer and preparation method thereof |
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