CN115627080A - Plant fiber degradable master batch and preparation method thereof - Google Patents
Plant fiber degradable master batch and preparation method thereof Download PDFInfo
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- CN115627080A CN115627080A CN202211357761.3A CN202211357761A CN115627080A CN 115627080 A CN115627080 A CN 115627080A CN 202211357761 A CN202211357761 A CN 202211357761A CN 115627080 A CN115627080 A CN 115627080A
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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
- C08L97/00—Compositions of lignin-containing materials
- C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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Abstract
The invention discloses a preparation method of a plant fiber degradable master batch, which comprises the following steps: (1) Cleaning the plant fiber to remove impurities, and drying for later use; (2) Adding sodium alginate and dipotassium glycyrrhizinate into water, heating to 60-70 ℃, carrying out flowing soaking treatment on the plant fiber treated in the step (1) at the flow rate of 0.5-1m/s in the heating process, continuously soaking the plant fiber at constant temperature at 60-70 ℃ at the flow rate of 0.3-0.5m/s, cooling to room temperature after soaking at constant temperature for 1-2h, carrying out flowing soaking on the plant fiber at the flow rate of 0.5-1m/s in the cooling process, repeating the heating, constant temperature and cooling processes for 3 times, centrifuging, removing supernate, and finishing the modification treatment on the plant fiber; (3) Banburying the plant fiber treated in the step (2), polylactic acid, hydroxyl iron powder and coupling agent at 90-100 ℃ for 30-40min to obtain the product. The plant fiber degradable master batch has high plant fiber content, improves the economic benefit of plant fiber, has easily degradable raw materials, and is environment-friendly.
Description
Technical Field
The invention relates to the field of degradable materials, in particular to a plant fiber degradable master batch and a preparation method thereof.
Background
At present, china is a world with large plastic production capacity, and the annual output of various plastic products exceeds 2100 million tons. However, the resource and environmental problems are increasingly serious due to the shortage of plastic raw material sources and the 'white pollution' caused by the non-degradability of plastic wastes. In order to solve the problem of the source of plastic raw materials and improve the degradability of plastic products, more and more degradable natural ingredients are used to replace the non-degradable and scarce-source raw materials in the plastic raw materials, such as plant fibers.
The plant fiber is rich in source, is cheap and inexhaustible renewable natural plant fiber, is derived from agricultural product wastes such as rice husks, straws, wheat straws, corn straws, cotton stalks, wood chips, bamboo chips and the like, and the total amount of the plant fiber is far more than that of petroleum, coal and natural gas. And the environment-friendly material can be biologically degraded after being discarded, is environment-friendly and can effectively reduce the production cost.
However, the plant fiber used in various plastic products has various problems, for example, the plant fiber has a small addition amount, because the plant fiber has poor water vapor resistance, oxidation resistance, acid resistance and other capabilities, the product is easily oxidized due to external environmental factors, and the high molecular connecting bond is broken, so that the material is rapidly aged, the strength is reduced and the material cannot be used, and therefore, the addition amount of the plant fiber needs to be reduced in order to ensure the performance of the material, the application range is limited, and the generated economic benefit is low. And when the addition amount of the plant fiber is large, the compatibility of the plant fiber and the polymer is poor, the mechanical property of the product is low, and even the product cannot be molded. Therefore, in order to solve the above problems, it is necessary to improve the application effect of the plant fiber in the plastic products, increase the addition amount of the plant fiber in the raw materials of the plastic products, and further develop the economic benefits of the plant fiber.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the purposes of the invention is to provide a preparation method of the plant fiber degradable master batch, which improves the performance of the plant fiber master batch and increases the content of the plant fiber.
The other purpose of the invention is to provide a plant fiber degradable master batch.
One of the purposes of the invention is realized by adopting the following technical scheme:
a preparation method of a plant fiber degradable master batch comprises the following steps:
(1) Cleaning the plant fiber to remove impurities, and drying for later use;
(2) Adding sodium alginate and dipotassium glycyrrhizinate into water, heating to 60-70 ℃, carrying out flowing soaking treatment on the plant fiber treated in the step (1) at the flow rate of 0.5-1m/s in the heating process, then continuously soaking the plant fiber at constant temperature at the flow rate of 0.3-0.5m/s at 60-70 ℃, cooling to room temperature after soaking at constant temperature for 1-2h, carrying out flowing soaking on the plant fiber at the flow rate of 0.5-1m/s in the cooling process, repeating the heating, constant temperature and cooling processes for 3 times, centrifuging, removing supernate, and finishing the modification treatment on the plant fiber;
(3) And (3) banburying the plant fiber treated in the step (2) with polylactic acid, hydroxyl iron powder and a coupling agent at 90-100 ℃ for 30-40min to obtain the plant fiber degradable master batch.
Preferably, the plant fiber in step (1) is bamboo fiber, and the diameter of the bamboo fiber is 100-200 μm.
Preferably, in the step (2), the heating rate is 3-5 ℃/min, and the cooling rate is 1-3 ℃/min.
Preferably, the mass concentration of the sodium alginate in the water is 10-15%, and the mass concentration of the dipotassium glycyrrhizinate in the water is 1-3%.
Preferably, the coupling agent is a titanate coupling agent.
The second purpose of the invention is realized by adopting the following technical scheme:
a plant fiber degradable master batch is prepared by the method.
Preferably, the plant fiber degradable master batch comprises the following raw materials in parts by weight: 50-70 parts of plant fiber, 20-40 parts of polylactic acid, 10-15 parts of sodium alginate, 1-3 parts of dipotassium glycyrrhizinate, 0.2-0.5 part of hydroxyl iron powder and 0.1-0.5 part of coupling agent.
Preferably, the plant fiber degradable master batch comprises the following raw materials in parts by weight: 60 parts of plant fiber, 30 parts of polylactic acid, 12 parts of sodium alginate, 2 parts of dipotassium glycyrrhizinate, 0.3 part of hydroxyl iron powder and 0.2 part of coupling agent.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a preparation method of a plant fiber degradable master batch, which adopts sodium alginate and dipotassium glycyrrhizinate to treat plant fibers under the condition of flowing soaking in the preparation process, improves the stability of the plant fibers, improves the compatibility of the plant fibers and polymers, and further does not influence the performance of products after increasing the dosage of the plant fibers. In the preparation process, the hydroxyl iron powder is also added to help the plant fiber degradable master batch to be better molded, and the mechanical property of the product is improved to a certain extent.
The invention also provides the plant fiber degradable master batch, which has high plant fiber content, meets the use requirements of various properties, reduces the production cost of products, improves the economic benefit of plant fibers, and is easy to degrade various raw materials for preparing the plant fiber master batch and environment-friendly.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, various embodiments or technical features described below may be arbitrarily combined to form a new embodiment.
Example 1
A preparation method of a plant fiber degradable master batch comprises the following steps:
(1) Cleaning bamboo fiber to remove impurities, and drying for later use, wherein the diameter of the bamboo fiber is 100-200 mu m;
(2) Adding sodium alginate and dipotassium glycyrrhizinate into water, wherein the mass concentration of sodium alginate in water is 12% and the mass concentration of dipotassium glycyrrhizinate in water is 2%, heating to 65 ℃ at 4 ℃/min, carrying out flowing soaking treatment on the plant fiber treated in the step (1) at the flow rate of 0.8m/s in the heating process, continuously soaking the plant fiber at the constant temperature of 0.4m/s at 65 ℃, cooling to room temperature at 2 ℃/min after soaking at the constant temperature for 1.5h, carrying out flowing soaking on the plant fiber at the flow rate of 0.8m/s in the cooling process, repeating the heating, constant temperature and cooling processes for 3 times, centrifuging, removing supernate, and finishing the modification treatment on the plant fiber;
(3) Banburying the plant fiber treated in the step (2) with polylactic acid, hydroxyl iron powder and titanate coupling agent at 95 ℃ for 30-40min to obtain the plant fiber degradable master batch.
The preparation method of the plant fiber degradable master batch comprises the following steps: 60 parts of plant fiber, 30 parts of polylactic acid, 12 parts of sodium alginate, 2 parts of dipotassium glycyrrhizinate, 0.3 part of hydroxyl iron powder and 0.2 part of titanate coupling agent.
Example 2
A preparation method of the plant fiber degradable master batch comprises the following steps:
(1) Cleaning bamboo fiber to remove impurities, and drying for later use, wherein the diameter of the bamboo fiber is 100-200 mu m;
(2) Adding sodium alginate and dipotassium glycyrrhizinate into water, wherein the mass concentration of the sodium alginate in the water is 10 percent, the mass concentration of the dipotassium glycyrrhizinate in the water is 1 percent, heating to 60 ℃ at a speed of 3 ℃/min, carrying out flowing soaking treatment on the plant fiber treated in the step (1) at a flow speed of 0.5m/s in the heating process, continuously soaking the plant fiber at a constant temperature at a speed of 0.3m/s at 60 ℃, cooling to room temperature at a speed of 1 ℃/min after soaking at the constant temperature for 1h, carrying out flowing soaking on the plant fiber at a flow speed of 0.5m/s in the cooling process, repeating the heating, constant temperature and cooling processes for 3 times, centrifuging, removing supernatant, and finishing modification treatment on the plant fiber;
(3) And (3) banburying the plant fiber treated in the step (2) with polylactic acid, hydroxyl iron powder and titanate coupling agent at 90 ℃ for 40min to obtain the plant fiber degradable master batch.
The preparation method of the plant fiber degradable master batch comprises the following steps: 50 parts of plant fiber, 20 parts of polylactic acid, 10 parts of sodium alginate, 1 part of dipotassium glycyrrhizinate, 0.2 part of hydroxyl iron powder and 0.1 part of titanate coupling agent.
Example 3
A preparation method of a plant fiber degradable master batch comprises the following steps:
(1) Cleaning bamboo fiber to remove impurities, and drying to obtain bamboo fiber with diameter of 100-200 μm;
(2) Adding sodium alginate and dipotassium glycyrrhizinate into water, wherein the mass concentration of the sodium alginate in the water is 15%, the mass concentration of the dipotassium glycyrrhizinate in the water is 3%, heating to 70 ℃ at a speed of 5 ℃/min, carrying out flowing soaking treatment on the plant fiber treated in the step (1) at a flow speed of 1m/s in the heating process, continuously soaking the plant fiber at a constant temperature of 0.5m/s at 70 ℃, cooling to room temperature at a speed of 3 ℃/min after soaking at the constant temperature for 2h, carrying out flowing soaking on the plant fiber at a flow speed of 1m/s in the cooling process, repeating the heating, constant temperature and cooling processes for 3 times, centrifuging, and removing a supernatant to finish the modification treatment on the plant fiber;
(3) And (3) banburying the plant fiber treated in the step (2) with polylactic acid, hydroxyl iron powder and titanate coupling agent at 100 ℃ for 30min to obtain the plant fiber degradable master batch.
A preparation method of a plant fiber degradable master batch is prepared by the method, and the dosage of each component is as follows: 70 parts of plant fiber, 40 parts of polylactic acid, 15 parts of sodium alginate, 3 parts of dipotassium glycyrrhizinate, 0.5 part of hydroxyl iron powder and 0.5 part of titanate coupling agent.
Comparative example 1
Comparative example 1 provides a plant fiber degradable master batch and a preparation method thereof, and the differences from example 1 are as follows: sodium alginate was omitted and the procedure was as in example 1.
Comparative example 2
Comparative example 2 provides a plant fiber degradable master batch and a preparation method thereof, and the differences from example 1 are as follows: dipotassium glycyrrhizinate was omitted and the procedure was the same as in example 1.
Comparative example 3
Comparative example 3 provides a plant fiber degradable master batch and a preparation method thereof, and the differences from example 1 are as follows: adjusting the step (2) as follows: soaking the plant fiber at a constant temperature of 65 ℃, wherein the liquid is kept still in the soaking process, and the soaking time is equal to the whole treatment process time of the step (2) in the embodiment 1.
Comparative example 4
Comparative example 4 provides a plant fiber degradable master batch and a preparation method thereof, and the differences from example 1 are as follows: the iron hydroxy powder was omitted and the procedure was as in example 1.
Comparative example 5
Comparative example 5 provides a plant fiber degradable master batch and a preparation method thereof, and the differences from example 1 are as follows: the iron powder of hydroxyl group was replaced with ordinary iron powder, and the rest was the same as in example 1.
The plant fiber degradable master batches prepared in examples 1 to 3 and comparative examples 1 to 5 were fed into an injection molding machine to be molded to obtain tensile property test sample strips, bending property test sample strips and impact property test sample strips, the tensile strength and the bending strength were measured by an electronic universal tensile testing machine, the impact strength of the samples was measured by an impact testing machine, and the results are shown in table 1.
TABLE 1
| Sample(s) | Tensile Strength (MPa) | Flexural Strength (MPa) | Impact Strength (KJ/m) 2 ) |
| Example 1 | 31.7 | 42.3 | 14.9 |
| Example 2 | 30.5 | 41.8 | 14.2 |
| Example 3 | 31.2 | 41.2 | 14.8 |
| Comparative example 1 | 20.6 | 29.4 | 11.7 |
| Comparative example 2 | 23.8 | 33.9 | 12.8 |
| Comparative example 3 | 25.1 | 34.7 | 12.1 |
| Comparative example 4 | 24.9 | 34.4 | 8.4 |
| Comparative example 5 | 21.7 | 31.5 | 7.9 |
It can be seen from table 1 that the degradable master batches of the plant fibers of examples 1 to 3 have better mechanical properties. Sodium alginate and dipotassium glycyrrhizinate are respectively omitted in the comparative example 1 and the comparative example 2, the tensile strength and the bending strength of the product are obviously reduced, and the sodium alginate and the dipotassium glycyrrhizinate are used for soaking the plant fibers, so that the stability of the plant fibers is improved, the compatibility of the plant fibers and polymers is improved, and the plant fibers are ensured to have better dispersibility in master batches after the dosage of the plant fibers is increased. In comparative example 3, the flow soaking process of the plant fiber is changed into static soaking, and as can be seen from table 1, the application effect of the treated plant fiber is inferior to that of example 1, which shows that the flow soaking mode adopted by the invention is helpful to improve the modification effect of sodium alginate and dipotassium glycyrrhizinate on the plant fiber. In comparative example 4, hydroxyl iron powder is omitted, the impact strength of the plant fiber degradable master batch is remarkably reduced, and in comparative example 5, the impact strength of the master batch is far lower than that of example 1 after the hydroxyl iron powder is replaced by common iron powder. The effect of improving the impact strength of the master batch by adding the hydroxyl iron powder is obvious, and the condition that the mechanical property of the prepared master batch is reduced due to the increase of the dosage of the plant fiber is improved.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are intended to be covered by the claims.
Claims (8)
1. The preparation method of the plant fiber degradable master batch is characterized by comprising the following steps:
(1) Cleaning the plant fiber to remove impurities, and drying for later use;
(2) Adding sodium alginate and dipotassium glycyrrhizinate into water, heating to 60-70 ℃, carrying out flowing soaking treatment on the plant fiber treated in the step (1) at the flow rate of 0.5-1m/s in the heating process, then continuously soaking the plant fiber at constant temperature at the flow rate of 0.3-0.5m/s at 60-70 ℃, cooling to room temperature after soaking at constant temperature for 1-2h, carrying out flowing soaking on the plant fiber at the flow rate of 0.5-1m/s in the cooling process, repeating the heating, constant temperature and cooling processes for 3 times, centrifuging, removing supernate, and finishing the modification treatment on the plant fiber;
(3) Banburying the plant fiber treated in the step (2), polylactic acid, hydroxyl iron powder and a coupling agent at 90-100 ℃ for 30-40min to obtain the plant fiber degradable master batch.
2. The method for preparing the plant fiber degradable masterbatch according to claim 1, wherein the plant fiber in the step (1) is a bamboo fiber, and the diameter of the bamboo fiber is 100-200 μm.
3. The method for preparing the plant fiber degradable master batch according to claim 1, wherein in the step (2), the temperature rising rate is 3-5 ℃/min, and the temperature reduction rate is 1-3 ℃/min.
4. The method for preparing the plant fiber degradable master batch according to claim 1, wherein the mass concentration of sodium alginate in water is 10-15%, and the mass concentration of dipotassium glycyrrhizinate in water is 1-3%.
5. The method for preparing the plant fiber degradable masterbatch according to claim 1, wherein the coupling agent is a titanate coupling agent.
6. A plant fiber degradable master batch, which is prepared by the method of any one of claims 1 to 5.
7. The plant fiber degradable masterbatch according to claim 6, comprising the following raw materials in parts by weight: 50-70 parts of plant fiber, 20-40 parts of polylactic acid, 10-15 parts of sodium alginate, 1-3 parts of dipotassium glycyrrhizinate, 0.2-0.5 part of hydroxyl iron powder and 0.1-0.5 part of coupling agent.
8. The plant fiber degradable master batch according to claim 7, which is characterized by comprising the following raw materials in parts by weight: 60 parts of plant fiber, 30 parts of polylactic acid, 12 parts of sodium alginate, 2 parts of dipotassium glycyrrhizinate, 0.3 part of hydroxyl iron powder and 0.2 part of coupling agent.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211357761.3A CN115627080A (en) | 2022-11-01 | 2022-11-01 | Plant fiber degradable master batch and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211357761.3A CN115627080A (en) | 2022-11-01 | 2022-11-01 | Plant fiber degradable master batch and preparation method thereof |
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| CN115627080A true CN115627080A (en) | 2023-01-20 |
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| CN202211357761.3A Withdrawn CN115627080A (en) | 2022-11-01 | 2022-11-01 | Plant fiber degradable master batch and preparation method thereof |
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Application publication date: 20230120 |
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