CN116875014A - Lignin fiber/starch/polylactic acid master batch and preparation method thereof - Google Patents
Lignin fiber/starch/polylactic acid master batch and preparation method thereof Download PDFInfo
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- CN116875014A CN116875014A CN202311005811.6A CN202311005811A CN116875014A CN 116875014 A CN116875014 A CN 116875014A CN 202311005811 A CN202311005811 A CN 202311005811A CN 116875014 A CN116875014 A CN 116875014A
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- polylactic acid
- starch
- lignin
- fiber
- lignin fiber
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- 229920000747 poly(lactic acid) Polymers 0.000 title claims abstract description 57
- 239000004626 polylactic acid Substances 0.000 title claims abstract description 57
- 229920005610 lignin Polymers 0.000 title claims abstract description 56
- 239000000835 fiber Substances 0.000 title claims abstract description 52
- 229920002472 Starch Polymers 0.000 title claims abstract description 34
- 239000008107 starch Substances 0.000 title claims abstract description 32
- 235000019698 starch Nutrition 0.000 title claims abstract description 32
- 239000004594 Masterbatch (MB) Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims description 8
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 15
- 235000015112 vegetable and seed oil Nutrition 0.000 claims abstract description 12
- 239000008158 vegetable oil Substances 0.000 claims abstract description 12
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 11
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 10
- 229920002261 Corn starch Polymers 0.000 claims description 5
- 239000008120 corn starch Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 229920001592 potato starch Polymers 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000003549 soybean oil Substances 0.000 claims description 3
- 235000012424 soybean oil Nutrition 0.000 claims description 3
- 230000007306 turnover Effects 0.000 claims description 3
- 244000017020 Ipomoea batatas Species 0.000 claims description 2
- 235000002678 Ipomoea batatas Nutrition 0.000 claims description 2
- 240000003183 Manihot esculenta Species 0.000 claims description 2
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims description 2
- 235000019482 Palm oil Nutrition 0.000 claims description 2
- 239000004359 castor oil Substances 0.000 claims description 2
- 235000019438 castor oil Nutrition 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 claims description 2
- 230000003197 catalytic effect Effects 0.000 claims description 2
- 235000012343 cottonseed oil Nutrition 0.000 claims description 2
- 239000002385 cottonseed oil Substances 0.000 claims description 2
- 238000006731 degradation reaction Methods 0.000 claims description 2
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims description 2
- 239000002540 palm oil Substances 0.000 claims description 2
- 239000002383 tung oil Substances 0.000 claims description 2
- 229940100445 wheat starch Drugs 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 12
- 239000006185 dispersion Substances 0.000 abstract description 8
- 150000001875 compounds Chemical class 0.000 abstract description 6
- 239000011159 matrix material Substances 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000011049 filling Methods 0.000 abstract description 4
- 239000004593 Epoxy Substances 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 9
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 3
- 239000003063 flame retardant Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229920002101 Chitin Polymers 0.000 description 2
- 239000004595 color masterbatch Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000010128 melt processing Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2403/02—Starch; Degradation products thereof, e.g. dextrin
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2491/00—Characterised by the use of oils, fats or waxes; Derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2497/00—Characterised by the use of lignin-containing materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
- C08K5/134—Phenols containing ester groups
- C08K5/1345—Carboxylic esters of phenolcarboxylic acids
Abstract
The invention discloses a lignin fiber/starch/polylactic acid master batch, which is prepared by melt blending the following materials in percentage by weight: 5-10% of lignin fiber; 35-50% of starch; 35-55% of high-melting-point polylactic acid; 2-5% of epoxidized vegetable oil; 0.1-0.3% of antioxidant, wherein the sum of the materials is percentage. The compound powder of the fibrous lignin fiber and the amorphous starch can overcome the problem that the fiber is difficult to disperse in the polylactic acid matrix, and the high-melting-point polylactic acid matrix is favorable for filling high-content powder, and the epoxy vegetable oil promotes the disintegration and uniform dispersion of the powder agglomerate. The masterbatch disclosed by the invention has higher lignin fiber content, can reduce the dosage of the modified polylactic acid composite material, has better dispersion uniformity compared with a mode of directly adding lignin fibers for melt blending, and is beneficial to improving the tear resistance and toughness of a polylactic acid composite material product.
Description
Technical Field
The invention belongs to the technical field of modified plastics, and particularly relates to a lignin fiber/polylactic acid filling modified master batch and a preparation method thereof.
Background
Most of color master batches used in the modified plastic industry adopt polyolefin resin polyethylene as a carrier, but the color master batches have poor compatibility in the modified polylactic acid composite material, so that the reinforcing, toughening and coloring energy is low, and the mechanical property, appearance and usability are affected.
The patent application with publication number of CN113736232A discloses a modified biodegradable material and a preparation method thereof, wherein the modified biodegradable material is prepared from the following components in percentage by weight: biodegradable material, 50-90%, preferably 65-85%; starch, 5-40%, preferably 10-30%; 1-10%, preferably 2-7% of a high melting point solid dispersant; 0.1 to 1 percent of opening agent.
The patent application with publication number of CN101851429A discloses a preparation method of lignin composite material, which is formed by mixing lignin, accessory high molecular compound, fiber substance, chitin, plasticizer, compatibilizer, antioxidant and flame retardant, and drying lignin, accessory high molecular compound and flame retardant; then stirring the plasticizer, the compatibilizer, the antioxidant, the dried lignin, the accessory polymer compound and the flame retardant in a dried high-speed stirrer according to a certain weight ratio to uniformly mix the materials, then placing the materials into a double-screw extruder for reaction, cooling and granulating the extruded product, and drying the product to obtain a composite master batch; soaking the fiber material in silane coupling agent solution with concentration of 0.1-2% to obtain modified fiber; and adding the composite master batch, the chitin and the modified fiber into a double-screw extruder in sequence for composite processing to obtain the finished lignin composite material.
The lignin fiber is uniformly dispersed in the polylactic acid, so that the tear resistance can be effectively improved, and the method is particularly suitable for processing and preparing packaging materials and bags. The lignin fiber structure contains a large amount of functional groups such as phenolic hydroxyl groups, carbonyl groups, carboxyl groups and the like, has certain compatibility with polylactic acid, and is expected to realize high-value utilization in the industry of biodegradable polylactic acid materials. However, fibrous lignin fibers are difficult to uniformly disperse in low melt index blow molding grade polylactic acid. Therefore, from the viewpoints of melt processing and compounding, a new way and a new process are explored to realize uniform dispersion of lignin fibers in polylactic acid, and the aim is achieved, so that the method has challenging and industrial application value.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a lignin fiber/starch/polylactic acid master batch and a preparation method thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the lignin fiber/starch/polylactic acid master batch is prepared by melt blending the following materials in percentage by weight:
5-10% of lignin fiber;
35-50% of starch;
35-55% of high-melting-point polylactic acid;
2-5% of epoxidized vegetable oil;
0.1-0.3% of an antioxidant;
the sum of the materials is percentage.
The lignin fibers are staple fibers, and the fiber length is 0.2-1.0 mm.
The starch is one or more of corn starch, tapioca starch, sweet potato starch, potato starch and wheat starch, preferably corn starch.
The melt index of the high-melt-index polylactic acid is 50-500 g/10min under the conditions that the temperature is 210 ℃ and the load is 2.16kg, the polylactic acid is synthesized into low-molecular-weight polylactic acid by a one-step method or a two-step method, or the polylactic acid resin with the melt index less than 50 g/10min is prepared by a catalytic degradation method.
The epoxidized vegetable oil is one or a mixture of more of epoxidized soybean oil, epoxidized castor oil, epoxidized palm oil, epoxidized cotton seed oil and epoxidized tung oil.
The antioxidant is hindered phenol antioxidant.
The preparation method of the lignin fiber/polylactic acid master batch comprises the following steps:
(1) Putting lignin fibers and starch in a set proportion into a vertical drying tank, starting a spiral belt to stir and turn over materials, pumping hot air from the bottom, exhausting air from an air outlet at the top, controlling the temperature to be 80-110 ℃, baking dry powder for 4-8 hours, discharging, sealing and preserving for later use;
(2) Adding dry powder, polylactic acid, epoxidized vegetable oil and an antioxidant into an internal mixer according to a set proportion, controlling the temperature to be 160-220 ℃, controlling the rotating speed to be 10-60 revolutions per minute, carrying out melt blending for 15-30 minutes, pressing into a single screw extruder, bracing, air cooling and granulating to obtain lignin fiber/starch/polylactic acid master batch.
Has the positive beneficial effects that:
(1) The compound powder of the fibrous lignin fiber and the amorphous starch can overcome the problem of difficult dispersion of the fiber in the polylactic acid matrix, the high-melting-point polylactic acid matrix is favorable for filling high-content powder, and the epoxy vegetable oil promotes the disintegration and uniform dispersion of the powder agglomerate.
(2) The masterbatch has higher lignin fiber content, can reduce the dosage of the modified polylactic acid composite material, has better dispersion uniformity degree compared with a mode of directly adding lignin fibers for melt blending, and is beneficial to improving the tear resistance and toughness of a polylactic acid composite material product.
Detailed Description
The invention is further illustrated by the following examples:
the following raw materials are used for experiments in the examples and comparative examples of the present invention, but the present invention is not limited to the following raw materials, and the effects of the lignocellulosic starch polylactic acid master batch described in the present invention will be further specifically described by taking the following raw materials as specific examples.
Example 1
High melt index polylactic acid resin: melt fingers 50 g/10min (PLA 50), 200g/10min (PLA 200) and 500 g/10min (PLA 500) are self-made polylactic acid resin by a one-step method, and melt fingers 65 g/10min are Dandall Luminy PLA L105 polylactic acid resin.
Lignin fiber: lengths of 0.2 mm (0.2 lignin), 0.5 mm (0.5 lignin) and 1.0 mm (1.0 lignin).
Starch: corn starch.
Epoxidized vegetable oil: epoxidized Soybean Oil (ESO).
An antioxidant: and an antioxidant 1010.
Examples 1 to 11 are provided, and the formula is shown in Table 1:
| example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | Example 8 | Example 9 | Example 10 | Example 11 | |
| 0.2 lignin | 2 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 0.5 lignin | 2 | 2 | 4 | 2 | 4 | 2 | 4 | 2 | 4 | 2 | 4 |
| 1.0 lignin | 1 | 4 | 4 | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 4 |
| Starch | 37.8 | 40 | 50 | 37.8 | 50 | 37.8 | 50 | 37.8 | 50 | 37.8 | 50 |
| PLA50 | 55 | 50.8 | 35 | 25 | 10 | ||||||
| L105 | 55 | 35 | 10 | 10 | |||||||
| PLA200 | 55 | 35 | 10 | 10 | |||||||
| PLA500 | 55 | 35 | 10 | 5 | |||||||
| ESO | 2 | 2 | 4.8 | 2 | 4.8 | 2 | 4.8 | 2 | 4.8 | 2 | 4.8 |
| 1010 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Totalizing | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
TABLE 1
Comparative examples 1 to 4 were set up in the present invention, and the formulation thereof is shown in the following table 2:
| comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | |
| 0.2 lignin | 2 | 2 | 2 | 2 |
| 0.5 lignin | 2 | 4 | 4 | 4 |
| 1.0 lignin | 1 | 5 | 8 | 8 |
| Starch | 35.8 | 50.8 | 37.8 | 49 |
| PLA50 | 57 | 33 | 16 | 7 |
| L105 | 10 | 10 | ||
| PLA200 | 10 | 10 | ||
| PLA500 | 10 | 5 | ||
| ESO | 2 | 5 | 2 | 4.8 |
| 1010 | 0.2 | 0.2 | 0.2 | 0.2 |
| Totalizing | 100 | 100 | 100 | 100 |
Examples 1 to 11 and comparative examples 1 to 4 were prepared by the following processes:
(1) Adding lignin fiber and starch with a set proportion into a vertical drying tank, starting a spiral belt to stir and turn over materials, pumping hot air from the bottom, exhausting air from an air outlet at the top, controlling the temperature at 100 ℃, baking dry powder for 6 hours, discharging, sealing and preserving for later use;
(2) Adding dry powder, polylactic acid, epoxidized vegetable oil and an antioxidant into an internal mixer according to a set proportion, controlling the temperature at 180 ℃, controlling the rotating speed at 50 revolutions per minute, carrying out melt blending for 20 minutes, pressing into a single-screw extruder, bracing, air cooling and granulating to obtain lignin fiber/starch/polylactic acid master batch.
The master batches prepared in the examples and comparative examples were evaluated for uniformity by observing the appearance, cutting the particles into flakes with a blade, and observing whether there were significant agglomerates in a scanning electron microscope.
The master batches prepared in examples 1-11 were uniform in particle size, free of burrs when observed with naked eyes, and free of obvious lignin fiber agglomerates when observed under a scanning electron microscope. The comparative example showed burrs of different degrees, and lignin fiber agglomerates of different degrees were found under a scanning electron microscope. Thus, it was demonstrated that incorporation of too much length of lignin fibers resulted in agglomeration and that low melt index did not adequately disentangle the lignin fibers.
The compound powder of the fibrous lignin fiber and the amorphous starch can overcome the problem that the fiber is difficult to disperse in a polylactic acid matrix, and the high-melting-point polylactic acid matrix is favorable for filling high-content powder, and the epoxy vegetable oil promotes the disintegration and uniform dispersion of powder agglomerates; the masterbatch has higher lignin fiber content, can reduce the dosage of the modified polylactic acid composite material, has better dispersion uniformity degree compared with a mode of directly adding lignin fibers for melt blending, and is beneficial to improving the tear resistance and toughness of a polylactic acid composite material product.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (6)
1. The lignin fiber/starch/polylactic acid master batch is prepared by melt blending the following materials in percentage by weight:
5-10% of lignin fiber;
35-50% of starch;
35-55% of high-melting-point polylactic acid;
2-5% of epoxidized vegetable oil;
0.1 to 0.3 percent of antioxidant,
the sum of the materials is percentage.
2. The lignin fiber/starch/polylactic acid master batch according to claim 1, wherein the lignin fiber is a staple fiber with a fiber length of 0.2-1.0 mm.
3. The lignin fiber/starch/polylactic acid masterbatch according to claim 1 wherein the starch is one or more of corn starch, tapioca starch, sweet potato starch, wheat starch, preferably corn starch.
4. The lignin fiber/starch/polylactic acid master batch according to claim 1, wherein the high melt index polylactic acid has a melt index of 50-500 g/10min under the conditions of 210 ℃ and 2.16kg load, and the polylactic acid is synthesized into low molecular weight polylactic acid by a one-step method or a two-step method, or is prepared from polylactic acid resin with a melt index of less than 50 g/10min by catalytic degradation.
5. The lignocellulosic/starch/polylactic acid masterbatch of claim 1 wherein the epoxidized vegetable oil is one or more of epoxidized soybean oil, epoxidized castor oil, epoxidized palm oil, epoxidized cottonseed oil, epoxidized tung oil.
6. The lignin fiber/starch/polylactic acid master batch according to claim 1, wherein the preparation method of the lignin fiber/polylactic acid master batch comprises the following steps:
(1) Putting lignin fibers and starch in a set proportion into a vertical drying tank, starting a spiral belt to stir and turn over materials, pumping hot air from the bottom, exhausting air from an air outlet at the top, controlling the temperature to be 80-110 ℃, baking dry powder for 4-8 hours, discharging, sealing and preserving for later use;
(2) Adding dry powder, polylactic acid, epoxidized vegetable oil and an antioxidant into an internal mixer according to a set proportion, controlling the temperature to be 160-220 ℃, controlling the rotating speed to be 10-60 revolutions per minute, carrying out melt blending for 15-30 minutes, pressing into a single screw extruder, bracing, air cooling and granulating to obtain lignin fiber/starch/polylactic acid master batch.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311005811.6A CN116875014A (en) | 2023-08-10 | 2023-08-10 | Lignin fiber/starch/polylactic acid master batch and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311005811.6A CN116875014A (en) | 2023-08-10 | 2023-08-10 | Lignin fiber/starch/polylactic acid master batch and preparation method thereof |
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| CN202311005811.6A Pending CN116875014A (en) | 2023-08-10 | 2023-08-10 | Lignin fiber/starch/polylactic acid master batch and preparation method thereof |
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| Country | Link |
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| CN (1) | CN116875014A (en) |
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- 2023-08-10 CN CN202311005811.6A patent/CN116875014A/en active Pending
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