CN115449201A - Bright surface improving method and process for polylactic acid straw composite material - Google Patents
Bright surface improving method and process for polylactic acid straw composite material Download PDFInfo
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- CN115449201A CN115449201A CN202211132582.XA CN202211132582A CN115449201A CN 115449201 A CN115449201 A CN 115449201A CN 202211132582 A CN202211132582 A CN 202211132582A CN 115449201 A CN115449201 A CN 115449201A
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- Prior art keywords
- polylactic acid
- parts
- composite material
- straw
- bright surface
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/002—Methods
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- 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
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
Abstract
The invention relates to the technical field of high polymer materials, and discloses a bright surface improving method of a polylactic acid straw composite material, which comprises the following components in parts by weight: 100 parts of PLA; 5-20 parts of PBAT; 1-5 parts of compatilizer; 1-10 parts of straw; 1-10 parts of a plasticizer; 1-5 parts of polylactic acid wax; 0.1-3 parts of antioxidant. The PLA is polylactic acid, and the molecular weight is 5-15 ten thousand Da. The PBAT is a copolymer of butanediol adipate and butanediol terephthalate, and the density is between 1.2g/ml and 1.25g/ml. The compatilizer is one of PLA-MAH or PBAT-MAH. According to the bright surface improving method and process of the polylactic acid straw composite material, the problem of reduction of the surface brightness of the composite material is solved by adding polylactic acid wax and mixing at high temperature before production. Small molecule polylactic acid waxes can increase the surface brightness of the molded article by continually migrating to the surface. The special material prepared by the method can meet the use requirements on tensile strength and heat resistance after being made into tableware.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a method and a process for improving the bright surface of a polylactic acid straw composite material.
Background
Polylactic acid (PLA) is a new biodegradable material made using starch raw materials proposed by renewable plant resources such as corn. The starch raw material is saccharified to obtain glucose, the glucose and certain strains are fermented to prepare high-purity lactic acid, and the polylactic acid with certain molecular weight is synthesized by a chemical synthesis method. The biodegradable plastic has good biodegradability, can be completely degraded by microorganisms in the nature after being used, finally generates carbon dioxide and water, does not pollute the environment, is very favorable for protecting the environment, and is a well-known environment-friendly material. The common plastic treatment method still burns and cremates to cause a large amount of greenhouse gases to be discharged into the air, while the polylactic acid plastic is buried in the soil to be degraded, and the generated carbon dioxide directly enters organic matters of the soil or is absorbed by plants, so that the carbon dioxide is not discharged into the air and does not cause the greenhouse effect.
The stem, leaf (ear) parts of mature crops are collectively called. Typically refers to the remainder of the wheat, rice, corn, potatoes, oilseed rape, cotton, sugar cane and other crops (typically roughage) after harvesting the seed. As a big agricultural country, china can generate a large amount of crop straws every year, and the straws are mainly applied to the fields of straw fertilizers, feed production, fiberboard preparation and the like. However, over 30wt% of crop straws are burned on site every year, which not only causes harm to human health, but also further aggravates global greenhouse effect, and is a great waste of biomass resources. The recycled and crushed straw can be used as a filling material for polylactic acid modification, which is beneficial to environmental protection and material cost reduction.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a bright surface improving method and process of a polylactic acid straw composite material, which have the advantages that the surface brightness of an injection molding product is increased, and the prepared special material meets the use requirements on tensile strength and heat resistance after being made into tableware.
In order to achieve the purpose, the invention provides the following technical scheme: a bright surface improving method of a polylactic acid straw composite material comprises the following components in parts by weight:
100 parts of PLA;
5-20 parts of PBAT;
1-5 parts of compatilizer;
1-10 parts of straw;
1-10 parts of a plasticizer;
1-5 parts of polylactic acid wax;
0.1-3 parts of antioxidant.
Preferably, the PLA is polylactic acid and has a molecular weight of 5 to 15 kilodaltons.
Preferably, the PBAT is a copolymer of butanediol adipate and butanediol terephthalate, and the density is between 1.2g/ml and 1.25g/ml
Preferably, the compatilizer is one of PLA-MAH or PBAT-MAH.
Preferably, the straw is one of crop straws such as wheat straw, corn straw and the like, or any combination of the crop straws, and the mesh number is 200-1000 meshes.
Preferably, the plasticizer is one of white oil, acetyl tributyl citrate and epoxidized soybean oil, or any combination thereof.
A bright surface improving process of a polylactic acid straw composite material comprises the following steps:
s1, adding PLA, PBAT, a compatilizer, polylactic acid wax and an antioxidant into a high-speed mixer according to the proportion in the formula, and stirring for 30min at 100 ℃;
s2, extruding and granulating the uniformly mixed raw materials in the step S1 at 130-180 ℃ by a double-screw extruder;
s3, adding a plasticizer through a liquid feeding pump of the third section or the fourth section;
s4, the length-diameter ratio of the double-screw extruder is 40-48, and the temperature of each zone from the feeding section to the die surface is controlled to be 130-180 ℃.
Has the advantages that:
according to the bright surface improving method and process of the polylactic acid straw composite material, the problem of reduction of the surface brightness of the composite material is solved by adding polylactic acid wax and mixing at high temperature before production. Small molecule polylactic acid waxes can increase the surface brightness of the molded article by continually migrating to the surface. The special material prepared by the method can meet the use requirements on tensile strength and heat resistance after being made into tableware.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example one
100kg of polylactic acid (PLA), 10kg of polybutylene adipate-butylene terephthalate copolymer (PBAT), 2kg of maleic anhydride grafted polylactic acid (PLA-MAH), 5kg of wheat straw, 1kg of polylactic acid wax, 0.3kg of antioxidant 1010 and 0.2kg of antioxidant 168 are sequentially added into a high-speed mixer according to the formula and are uniformly mixed at the temperature of 100 ℃. Adding into a double-screw extruder (screw diameter is 50mm, length-diameter ratio is 48, 1) for extrusion granulation, adding 1kg of ATBC from a liquid feed port of the extruder, and setting the temperature of each section of the extruder (from the feed port to a die head): 120 deg.C, 160 deg.C, 170 deg.C, 178 deg.C, 180 deg.C, 175 deg.C, 170 deg.C. The screw speed was 300rpm and the feed speed was 100rpm.
Example two
100kg of polylactic acid (PLA), 10kg of polybutylene adipate-butylene terephthalate copolymer (PBAT), 2kg of maleic anhydride grafted polylactic acid (PLA-MAH), 5kg of wheat straw, 3kg of polylactic acid wax, 0.3kg of antioxidant 1010 and 0.2kg of antioxidant 168 are sequentially added into a high-speed mixer according to the formula and are uniformly mixed at the temperature of 100 ℃. Adding into a double-screw extruder (screw diameter is 50mm, length-diameter ratio is 48: 1), extruding and granulating, wherein 1kg of ATBC is added from a liquid feed port of the extruder, and the temperature of each section of the extruder is set as (from the feed port to a die head): 120 deg.C, 160 deg.C, 170 deg.C, 178 deg.C, 180 deg.C, 175 deg.C, 170 deg.C. The screw speed was 300rpm and the feed speed was 100rpm.
EXAMPLE III
100kg of polylactic acid (PLA), 10kg of polybutylene adipate-butylene terephthalate copolymer (PBAT), 2kg of maleic anhydride grafted polylactic acid (PLA-MAH), 5kg of wheat straw, 5kg of polylactic acid wax, 0.3kg of antioxidant 1010 and 0.2kg of antioxidant 168 are sequentially added into a high-speed mixer according to the formula and are uniformly mixed at the temperature of 100 ℃. Adding into a double-screw extruder (screw diameter is 50mm, length-diameter ratio is 48: 1), extruding and granulating, wherein 1kg of ATBC is added from a liquid feed port of the extruder, and the temperature of each section of the extruder is set as (from the feed port to a die head): 120 deg.C, 160 deg.C, 170 deg.C, 178 deg.C, 180 deg.C, 175 deg.C, 170 deg.C. The screw speed was 300rpm and the feed speed was 100rpm.
The sample strips prepared from the special material of the above embodiment are subjected to performance tests (see table 1), and it can be seen that the composite material produced by the method has basically no change in mechanical properties, and the surface gloss is obviously improved:
table 1 table of performance testing data
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A bright surface improving method of a polylactic acid straw composite material is characterized by comprising the following components in parts by weight:
100 parts of PLA;
5-20 parts of PBAT;
1-5 parts of compatilizer;
1-10 parts of straw;
1-10 parts of a plasticizer;
1-5 parts of polylactic acid wax;
0.1-3 parts of antioxidant.
2. The method for improving the bright surface of the polylactic acid straw composite material as claimed in claim 1, wherein the method comprises the following steps: the PLA is polylactic acid, and the molecular weight is 5-15 ten thousand Da.
3. The method for improving the bright surface of the polylactic acid straw composite material according to claim 1, which is characterized in that: the PBAT is a copolymer of butanediol adipate and butanediol terephthalate, and the density is 1.2 g/ml-1.25 g/ml.
4. The method for improving the bright surface of the polylactic acid straw composite material according to claim 1, which is characterized in that: the compatilizer is one of PLA-MAH or PBAT-MAH.
5. The method for improving the bright surface of the polylactic acid straw composite material according to claim 1, which is characterized in that: the straw is one of crop straws such as wheat straw, corn straw and the like, or any group of crop straw combination, and the mesh number is 200-1000 meshes.
6. The method and the process for improving the bright surface of the polylactic acid straw composite material according to claim 1, wherein the bright surface is characterized in that: the plasticizer is one of white oil, acetyl tributyl citrate and epoxidized soybean oil, or any combination thereof.
7. A bright surface improving process of a polylactic acid straw composite material is characterized by comprising the following steps:
s1, adding PLA, PBAT, a compatilizer, polylactic acid wax and an antioxidant into a high-speed mixer according to the proportion in the formula, and stirring for 30min at 100 ℃;
s2, extruding and granulating the uniformly mixed raw materials in the step S1 at 130-180 ℃ by a double-screw extruder;
s3, adding a plasticizer through a liquid feeding pump of the third section or the fourth section;
s4, the length-diameter ratio of the double-screw extruder is 40-48, and the temperature of each zone from the feeding section to the die surface is controlled to be 130-180 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211132582.XA CN115449201A (en) | 2022-09-17 | 2022-09-17 | Bright surface improving method and process for polylactic acid straw composite material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211132582.XA CN115449201A (en) | 2022-09-17 | 2022-09-17 | Bright surface improving method and process for polylactic acid straw composite material |
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| CN115449201A true CN115449201A (en) | 2022-12-09 |
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| CN202211132582.XA Pending CN115449201A (en) | 2022-09-17 | 2022-09-17 | Bright surface improving method and process for polylactic acid straw composite material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116376236A (en) * | 2023-01-30 | 2023-07-04 | 吉安市碳宝新材料有限公司 | Preparation technology of superfine plant fiber powder composite full-falling agricultural film material |
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2022
- 2022-09-17 CN CN202211132582.XA patent/CN115449201A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116376236A (en) * | 2023-01-30 | 2023-07-04 | 吉安市碳宝新材料有限公司 | Preparation technology of superfine plant fiber powder composite full-falling agricultural film material |
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