CN111777845A - Food-grade antibacterial antistatic PLA material and preparation method thereof - Google Patents
Food-grade antibacterial antistatic PLA material and preparation method thereof Download PDFInfo
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- CN111777845A CN111777845A CN202010707868.0A CN202010707868A CN111777845A CN 111777845 A CN111777845 A CN 111777845A CN 202010707868 A CN202010707868 A CN 202010707868A CN 111777845 A CN111777845 A CN 111777845A
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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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0806—Silver
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/017—Additives being an antistatic agent
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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
- C08L2201/04—Antistatic
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
-
- 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
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Abstract
The invention relates to the technical field of high polymer materials, in particular to a food-grade antibacterial antistatic PLA material and a preparation method thereof. The composition comprises the following substances in parts by weight: 50-70 parts of PLA resin, 10-20 parts of PBAT, 5-20 parts of filling mineral powder, 0.5-3 parts of antistatic agent, 6-20 parts of antibacterial agent, 3-5 parts of coupling agent and 1-2 parts of lubricant. Compared with the prior art, the invention adopting the technical scheme has the following beneficial effects: the antibacterial agent used in the invention is an inorganic and organic compound antibacterial agent, so that the broad spectrum of the antibacterial material is further improved, the antibacterial effect is better, the cost is reduced, the antibacterial material conforms to the certification and test of FDA, ROHS and REACH, and can be used for food and medical products. The antistatic agent used in the invention is sulfonate prepared by a distillation method, has good compatibility and does not have precipitates. Can exert excellent antistatic dust removal performance under low humidity environment.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a food-grade antibacterial antistatic PLA material and a preparation method thereof.
Background
After the food is produced and processed, in order to ensure that the food is free from various microorganisms or other physical and chemical factors and maintain the value of the food, a large amount of plastic packaging materials are required for packaging.
Recently, garbage classification is widely carried out in various big cities in China, and the problem of environmental protection is more and more emphasized in China. With the strictest environmental protection policy in China, the prevention and treatment of plastic pollution are further enhanced, and the disposable snack box in China is converted from a non-degradable plastic material to a more environmentally-friendly degradable material in the future.
The country will prohibit the use of non-degradable disposable plastic tableware.
The polylactic acid (PLA) material is a safe, efficient and pollution-free high polymer material approved by the United states food and drug administration, because the raw materials are taken from plant resources, the production and processing process has no pollution to the environment, has the strength and transparency of the traditional plastic, has good mechanical and physical properties, is convenient to process when being used for food packaging, has good air permeability, does not pollute the food and the environment, and has good biodegradability, and the final product is water and carbon dioxide, so the PLA material is a very green and environment-friendly material.
However, the pure polylactic acid film has poor antibacterial performance, and meanwhile, in the processes of granulation and finished product processing, the electrostatic dust absorption is easy to affect the sanitation of packaged food, so that the food-grade antibacterial and antistatic performance of the polylactic acid is further improved when the polylactic acid film is applied to the food packaging industry.
Disclosure of Invention
The purpose of the invention is as follows: in order to provide a food-grade antibacterial antistatic PLA material with better effect and a preparation method, the specific aim is to see a plurality of substantial technical effects of the specific implementation part.
In order to achieve the purpose, the invention adopts the following technical scheme:
a food-grade antibacterial antistatic PLA material is characterized by comprising the following substances in parts by weight: 50-70 parts of PLA resin, 10-20 parts of PBAT, 5-20 parts of filling mineral powder, 0.5-3 parts of antistatic agent, 6-20 parts of antibacterial agent, 3-5 parts of coupling agent and 1-2 parts of lubricant.
The further technical scheme of the invention is that the mineral powder filling material is at least one of calcium carbonate, talcum powder, diatomite and montmorillonite.
The invention further adopts the technical scheme that the antistatic agent is sulfonate prepared by a distillation method, and the sulfonate is food grade and/or medical grade.
The invention further adopts the technical scheme that the antibacterial agent is at least one of zinc borate, zinc oxide, magnesium oxide, silver powder, chitosan and tea polyphenol.
The invention further adopts the technical scheme that the coupling agent is at least one of glycidyl methacrylate, maleic anhydride grafting compatilizer and silane coupling agent.
The further technical scheme of the invention is that the lubricant is at least one of EBS, stearate and glyceryl monostearate.
A preparation method of a food-grade antibacterial antistatic PLA material is characterized by comprising the following steps:
s1, putting 70-90 parts of PLA resin, 10-20 parts of PBAT and 3-5 parts of coupling agent into a high-speed stirrer to stir for 3-5 min;
s2, putting 5-20 parts of filling mineral powder, 0.5-3 parts of antistatic agent, 6-20 parts of antibacterial agent and 1-2 parts of lubricant into a high-speed stirrer and stirring for 3-5 min;
and S3, adding the S1 mixed material into a double-screw extruder through a main feeding hopper, adding the S2 mixed material into the double-screw extruder through a side feeding hopper, and preparing granules through melting, extruding, granulating and drying.
The further technical scheme of the invention is that the melt extrusion process comprises the following steps: the temperature of the double-screw extruder barrel is 150-210 ℃, the rotating speed of the screw is 350-450r/min, the rotating speed of the main machine is 18-20Hz, and the vacuum degree is-0.06-0.08 MPa.
Compared with the prior art, the invention adopting the technical scheme has the following beneficial effects: the antibacterial agent used in the invention is an inorganic and organic compound antibacterial agent, so that the broad spectrum of the antibacterial material is further improved, the antibacterial effect is better, the cost is reduced, the antibacterial material conforms to the certification and test of FDA, ROHS and REACH, and can be used for food and medical products.
The antistatic agent used in the invention is sulfonate prepared by a distillation method, has good compatibility and does not have precipitates. Can exert excellent antistatic dust removal performance under low humidity environment.
Detailed Description
The present invention will be further illustrated with reference to the following specific embodiments, which are to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever.
The patent provides a plurality of parallel schemes, and different expressions belong to an improved scheme based on a basic scheme or a parallel scheme. Each solution has its own unique features.
Example 1:
s1, putting 60 parts of PLA resin, 20 parts of PBAT and 3 parts of glycidyl methacrylate into a high-speed stirrer and stirring for 3-5 min;
s2, putting 15 parts of talcum powder, 3 parts of antistatic agent, 1 part of zinc borate, 5 parts of chitosan and 2 parts of EBS into a high-speed stirrer and stirring for 3-5 min;
and S3, adding the S1 mixed material into a double-screw extruder through a main feeding hopper, adding the S2 mixed material into the double-screw extruder through a side feeding hopper, and preparing granules through melting, extruding, granulating and drying.
Wherein the temperature of a charging barrel of the double-screw extruder is 150 ℃, the rotating speed of a screw is 350r/min, and the frequency of a main machine is 18 Hz.
Example 2:
s1, putting 70 parts of PLA resin, 10 parts of PBAT and 5 parts of maleic anhydride grafted compatilizer into a high-speed stirrer and stirring for 3-5 min;
s2, putting 5 parts of calcium carbonate, 0.5 part of antistatic agent, 3 parts of zinc borate, 3 parts of zinc oxide, 1 part of magnesium oxide, 7 parts of tea polyphenol and 1 part of calcium stearate into a high-speed stirrer to stir for 3-5 min;
and S3, adding the S1 mixed material into a double-screw extruder through a main feeding hopper, adding the S2 mixed material into the double-screw extruder through a side feeding hopper, and preparing granules through melting, extruding, granulating and drying.
Wherein the temperature of a charging barrel of the double-screw extruder is 210 ℃, the rotating speed of a screw is 450r/min, and the frequency of a main machine is 20 Hz.
Example 3:
s1, putting 50 parts of PLA resin, 15 parts of PBAT and 4 parts of silane coupling agent into a high-speed stirrer and stirring for 3-5 min;
s2, putting 5 parts of diatomite, 1 part of antistatic agent, 1 part of magnesium oxide, 0.5 part of silver powder, 10 parts of chitosan, 8.5 parts of tea polyphenol and 1.5 parts of glycerin monostearate into a high-speed stirrer to be stirred for 3-5 min;
and S3, adding the S1 mixed material into a double-screw extruder through a main feeding hopper, adding the S2 mixed material into the double-screw extruder through a side feeding hopper, and preparing granules through melting, extruding, granulating and drying.
Wherein the temperature of a charging barrel of the double-screw extruder is 200 ℃, the rotating speed of a screw is 400r/min, and the frequency of a main machine is 19 Hz.
Comparative example 1
The raw material ratio in the embodiment 1 is changed as follows:
s1, putting 60 parts of PLA resin, 20 parts of PBAT and 3 parts of glycidyl methacrylate into a high-speed stirrer and stirring for 3-5 min;
s2, putting 18 parts of talcum powder, 1 part of zinc borate, 5 parts of chitosan and 2 parts of EBS into a high-speed stirrer and stirring for 3-5 min;
and S3, adding the S1 mixed material into a double-screw extruder through a main feeding hopper, adding the S2 mixed material into the double-screw extruder through a side feeding hopper, and preparing granules through melting, extruding, granulating and drying.
Wherein the temperature of a charging barrel of the double-screw extruder is 150 ℃, the rotating speed of a screw is 350r/min, and the frequency of a main machine is 18 Hz.
Comparative example 2
The raw material ratio in the embodiment 1 is changed as follows:
s1, putting 60 parts of PLA resin, 20 parts of PBAT and 3 parts of glycidyl methacrylate into a high-speed stirrer and stirring for 3-5 min;
s2, putting 21 parts of talcum powder, 3 parts of antistatic agent and 2 parts of EBS into a high-speed stirrer and stirring for 3-5 min;
and S3, adding the S1 mixed material into a double-screw extruder through a main feeding hopper, adding the S2 mixed material into the double-screw extruder through a side feeding hopper, and preparing granules through melting, extruding, granulating and drying.
Wherein the temperature of a charging barrel of the double-screw extruder is 150 ℃, the rotating speed of a screw is 350r/min, and the frequency of a main machine is 18 Hz.
In summary, the invention has the following advantages:
the antibacterial agent used in the invention is an inorganic and organic compound antibacterial agent, so that the broad spectrum of the antibacterial material is further improved, and the antibacterial effect is better;
the antistatic agent used in the invention is sulfonate prepared by a distillation method, and the electrostatic ash absorption phenomenon on the surface of the material is obviously reduced.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which is also within the scope of the appended claims.
Claims (8)
1. A food-grade antibacterial antistatic PLA material is characterized by comprising the following substances in parts by weight: 50-70 parts of PLA resin, 10-20 parts of PBAT, 5-20 parts of filling mineral powder, 0.5-3 parts of antistatic agent, 6-20 parts of antibacterial agent, 3-5 parts of coupling agent and 1-2 parts of lubricant.
2. The food-grade antibacterial antistatic PLA material as claimed in claim 1, wherein the mineral powder filling is at least one of calcium carbonate, talcum powder, diatomite and montmorillonite.
3. A food grade antimicrobial antistatic PLA material of claim 1 wherein the antistatic agent is a distilled sulfonate salt, the sulfonate salt being food grade and/or medical grade.
4. A food grade antimicrobial antistatic PLA material of claim 1 wherein the antimicrobial agent is at least one of zinc borate, zinc oxide, magnesium oxide, silver powder, chitosan, tea polyphenols.
5. A food grade antibacterial antistatic PLA material as claimed in claim 1 wherein the coupling agent is at least one of glycidyl methacrylate, maleic anhydride grafted compatibilizer, silane coupling agent.
6. A food grade antimicrobial antistatic PLA material as claimed in claim 1 wherein the lubricant is at least one of Ethylene Bis Stearamide (EBS), stearate, glyceryl monostearate.
7. A preparation method of a food-grade antibacterial antistatic PLA material is characterized by comprising the following steps:
s1, putting 70-90 parts of PLA resin, 10-20 parts of polybutylene terephthalate-adipate (PBAT) and 3-5 parts of coupling agent into a high-speed stirrer to stir for 3-5 min;
s2, putting 5-20 parts of filling mineral powder, 0.5-3 parts of antistatic agent, 6-20 parts of antibacterial agent and 1-2 parts of lubricant into a high-speed stirrer and stirring for 3-5 min;
and S3, adding the S1 mixed material into a double-screw extruder through a main feeding hopper, adding the S2 mixed material into the double-screw extruder through a side feeding hopper, and carrying out melting, extrusion, grain cutting and drying to obtain granules.
8. The preparation method of food-grade antibacterial antistatic PLA material according to claim 7, wherein the melt extrusion process is as follows: the temperature of the double-screw extruder barrel is 150-210 ℃, the rotating speed of the screw is 350-450r/min, the rotating speed of the main machine is 18-20Hz, and the vacuum degree is-0.06-0.08 MPa.
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| CN202010707868.0A CN111777845A (en) | 2020-07-21 | 2020-07-21 | Food-grade antibacterial antistatic PLA material and preparation method thereof |
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| CN202010707868.0A CN111777845A (en) | 2020-07-21 | 2020-07-21 | Food-grade antibacterial antistatic PLA material and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112625411A (en) * | 2020-12-10 | 2021-04-09 | 好维股份有限公司 | Biodegradable antibacterial toothbrush and production process thereof |
| CN112679928A (en) * | 2020-12-28 | 2021-04-20 | 东莞市三至新材料技术有限公司 | Full-biodegradable antibacterial PLA/PBAT film and preparation method thereof |
| CN113415044A (en) * | 2021-07-01 | 2021-09-21 | 百草春天大生物科技(青岛)有限公司 | Large biological stone plastic floor containing tea bioactive component |
| CN113637299A (en) * | 2021-08-27 | 2021-11-12 | 昌亚新材料科技有限公司 | Heat-resistant and impact-resistant polylactic acid composite material and preparation method and application thereof |
| CN115572476A (en) * | 2022-10-10 | 2023-01-06 | 孙明亮 | Antibacterial flame-retardant water-resistant polyurethane elastomer and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112625411A (en) * | 2020-12-10 | 2021-04-09 | 好维股份有限公司 | Biodegradable antibacterial toothbrush and production process thereof |
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| CN112679928A (en) * | 2020-12-28 | 2021-04-20 | 东莞市三至新材料技术有限公司 | Full-biodegradable antibacterial PLA/PBAT film and preparation method thereof |
| CN113415044A (en) * | 2021-07-01 | 2021-09-21 | 百草春天大生物科技(青岛)有限公司 | Large biological stone plastic floor containing tea bioactive component |
| CN113637299A (en) * | 2021-08-27 | 2021-11-12 | 昌亚新材料科技有限公司 | Heat-resistant and impact-resistant polylactic acid composite material and preparation method and application thereof |
| CN113637299B (en) * | 2021-08-27 | 2022-04-05 | 宁波昌亚新材料科技股份有限公司 | Heat-resistant and impact-resistant polylactic acid composite material and preparation method and application thereof |
| CN115572476A (en) * | 2022-10-10 | 2023-01-06 | 孙明亮 | Antibacterial flame-retardant water-resistant polyurethane elastomer and preparation method thereof |
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