CN113789037B - Biodegradable plastic and express packaging bag made of biodegradable plastic - Google Patents
Biodegradable plastic and express packaging bag made of biodegradable plastic Download PDFInfo
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- CN113789037B CN113789037B CN202111178492.XA CN202111178492A CN113789037B CN 113789037 B CN113789037 B CN 113789037B CN 202111178492 A CN202111178492 A CN 202111178492A CN 113789037 B CN113789037 B CN 113789037B
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- 229920000704 biodegradable plastic Polymers 0.000 title claims abstract description 50
- 238000004806 packaging method and process Methods 0.000 title abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 100
- 238000002425 crystallisation Methods 0.000 claims abstract description 92
- 230000008025 crystallization Effects 0.000 claims abstract description 92
- 239000003999 initiator Substances 0.000 claims abstract description 78
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 50
- 239000002002 slurry Substances 0.000 claims abstract description 39
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 35
- 239000004626 polylactic acid Substances 0.000 claims abstract description 34
- 239000013067 intermediate product Substances 0.000 claims abstract description 33
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 claims abstract description 29
- 238000000227 grinding Methods 0.000 claims abstract description 20
- AXKZIDYFAMKWSA-UHFFFAOYSA-N 1,6-dioxacyclododecane-7,12-dione Chemical compound O=C1CCCCC(=O)OCCCCO1 AXKZIDYFAMKWSA-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002270 dispersing agent Substances 0.000 claims abstract description 18
- 239000000178 monomer Substances 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 22
- 239000012745 toughening agent Substances 0.000 claims description 10
- 230000003712 anti-aging effect Effects 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 229920005646 polycarboxylate Polymers 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims 1
- 238000001694 spray drying Methods 0.000 claims 1
- 239000002861 polymer material Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 11
- -1 polybutylene adipate Polymers 0.000 description 10
- 239000000203 mixture Substances 0.000 description 8
- 229920005586 poly(adipic acid) Polymers 0.000 description 6
- 229920001707 polybutylene terephthalate Polymers 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 230000006911 nucleation Effects 0.000 description 5
- 238000010899 nucleation Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- WSQZNZLOZXSBHA-UHFFFAOYSA-N 3,8-dioxabicyclo[8.2.2]tetradeca-1(12),10,13-triene-2,9-dione Chemical compound O=C1OCCCCOC(=O)C2=CC=C1C=C2 WSQZNZLOZXSBHA-UHFFFAOYSA-N 0.000 description 4
- 238000010096 film blowing Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical group [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 3
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 3
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 3
- 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 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920006126 semicrystalline polymer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- 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
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/46—Applications of disintegrable, dissolvable or edible materials
- B65D65/466—Bio- or photodegradable packaging 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/14—Gas barrier composition
-
- 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
- C08L2205/24—Crystallisation aids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The invention relates to the field of high polymer materials, in particular to biodegradable plastic and an express packaging bag prepared from the biodegradable plastic, wherein the biodegradable plastic comprises the following components: poly (butylene adipate/terephthalate), polylactic acid and a crystallization initiator; the preparation method of the crystallization initiator comprises the following steps: crushing and primary grinding raw silica ore to obtain a silica intermediate product; step (2), uniformly mixing water and a dispersing agent, adding a silica intermediate product while stirring, and then grinding for the second time to obtain water slurry; and (3) drying the water slurry to obtain a crystallization initiator, wherein the water content of the crystallization initiator is lower than 0.5%, the monomer diameter of the crystallization initiator is 0.8-1.5 mu m, and the thickness of the crystallization initiator is 0.08-0.15 mu m. This application has the advantage that makes biodegradable plastics's tensile strength improve.
Description
Technical Field
The invention relates to the field of high polymer materials, in particular to biodegradable plastic and an express packaging bag made of the biodegradable plastic.
Background
Express bags are bags used for packaging files, receipts, data, goods and the like in the express industry.
The express bag belongs to a disposable packaging bag, and is convenient to use and easy to cause environmental pollution, so that people use biodegradable polylactic acid or poly adipic acid/polybutylene terephthalate as plastic for preparing the express bag, but the polylactic acid or poly adipic acid/polybutylene terephthalate has poor tensile strength and is difficult to meet the general requirements of the express packaging industry.
Disclosure of Invention
In order to improve biodegradable plastics's tensile strength, this application provides a biodegradable plastics and express delivery wrapping bag that makes thereof.
The biodegradable plastic comprises the following components in parts by weight:
55-80 parts of poly (butylene adipate/terephthalate)
10-15 parts of polylactic acid
20-30 parts of a crystallization initiator;
the preparation method of the crystallization initiator comprises the following steps:
crushing and primary grinding raw silica ore to obtain a silica intermediate product;
step (2), uniformly mixing water and a dispersing agent, adding a silica intermediate product while stirring, and grinding for the second time to obtain water slurry, wherein the silica intermediate product accounts for 35-40% by mass, the dispersing agent accounts for 0.2-0.5% by mass, and the balance is water;
and (3) drying the water slurry to obtain a crystallization initiator, wherein the water content of the crystallization initiator is lower than 0.5%, the monomer diameter of the crystallization initiator is 0.8-1.5 mu m, and the thickness of the crystallization initiator is 0.08-0.15 mu m.
The water content of the crystallization initiator obtained by controlling the drying of the water slurry is lower than 0.5%, so that the crystallization initiator is not easy to bring out water to cause surface defects in the processing process, and the crystallization effect of the biodegradable plastic is not easy to influence. The monomer diameter of the crystallization initiator is 0.8-1.5 mu m, the thickness is 0.08-0.15 mu m, so that the particle size of the crystallization initiator is very small, and the crystallization initiator can be uniformly dispersed in the poly (butylene adipate/terephthalate) and the poly (lactic acid).
The polybutylene adipate/terephthalate and the polylactic acid have good degradability, the polybutylene adipate/terephthalate is a semi-crystalline polymer, the crystallinity is about 30%, and the polylactic acid is a crystalline polymer and can be crystallized in the processing process. The crystallization initiator prepared by the process has a unique sheet structure and excellent heat conduction speed, and can promote the horizontal growth and crystallization of the mixture of the polybutylene adipate/terephthalate and the polylactic acid in the sheet structure of the crystallization initiator in the crystallization growth process in the cooling and shaping process of the mixture of the polybutylene adipate/terephthalate and the polylactic acid, so that the crystallization performance of the mixture of the polybutylene adipate/terephthalate and the polylactic acid is improved, and the tensile strength of biodegradable plastics is further improved.
Through the matching of the crystallization initiator, the poly (butylene adipate)/terephthalate and the polylactic acid in a specific ratio, the number of crystallization nucleation and the production speed of crystal nuclei are controlled, the improvement of the impact strength and the tensile strength of biodegradable plastic is facilitated, and the express packaging bag made of the biodegradable plastic is not easy to break.
Meanwhile, the crystallization initiator is of a sheet structure, so that the film forming speed of biodegradable plastic in the process of preparing the express packaging bag can be increased after the crystallization initiator is added, and the production efficiency of the express packaging bag is improved. The raw material of the crystallization initiator is silica which contains more potassium elements beneficial to soil, so that the crystallization initiator is beneficial to soil after being degraded.
Preferably, the particle size of the silica intermediate product is 250-325 meshes, and after the secondary grinding, the particle size of the silica intermediate product in the water slurry is 3-5 μm.
By controlling the particle size of the silica intermediate product in the step (1) to be 250-325 meshes, and after the secondary grinding, the particle size of the silica intermediate product in the water slurry is 3-5 mu m, the particle size of the silica is gradually reduced, and the laminated sheet-shaped silica product with lower particle size is obtained.
Preferably, the aqueous slurry is spray dried: controlling the feeding speed of the water slurry to be 9-12 tons/hour, atomizing the water slurry into small droplets, and simultaneously contacting with hot air with the temperature of 360-380 ℃ and the speed of 5-8m/s to obtain the crystallization initiator.
The water slurry drying effect is better through the control of the feeding speed of the water slurry, the temperature and the speed of the hot air, so that the water content of the crystallization initiator is lower than 0.5 percent, therefore, the sheet structure of the crystallization initiator is not easy to damage in the subsequent processing process, and the crystallization effect of the crystallization initiator on inducing biodegradable plastic is better.
Preferably, in the step (2), the rotating speed is 20-30r/min when the silica intermediate product is added while stirring.
By controlling the rotating speed to be 20-30r/min, the intermediate silica product with higher specific gravity is not easy to sink in the feeding process, so that the dispersibility of the intermediate silica product in the water slurry is better, and the grinding effect of the intermediate silica product in the water slurry is favorably improved.
Preferably, the dispersant is a polycarboxylate-type dispersant.
Such as the Rohm and Haas dispersant ACUMER 9400, not only has high dispersion efficiency and can maintain the dispersion stability of the silica intermediate product, but also can reduce the viscosity of the aqueous solution of the silica intermediate product with high solid content, is beneficial to reducing the grinding resistance of the silica intermediate product and improving the grinding effect of the silica intermediate product.
Preferably, the biodegradable plastic further comprises the following components in parts by mass:
10-15 parts of toughening agent
3-8 parts of anti-aging agent.
In a second aspect, the present application adopts a method for preparing biodegradable plastic, which adopts the following technical scheme:
a method for preparing biodegradable plastic comprises the following steps:
step one, respectively drying poly (butylene adipate/terephthalate), polylactic acid and a crystallization initiator for 5-7h at 55-65 ℃, 40-50 ℃ and 75-85 ℃;
and step two, melting and blending the dried poly (butylene adipate/terephthalate), polylactic acid and crystallization initiator, extruding and granulating to obtain the biodegradable plastic.
Preferably, in the second step, a toughening agent and an anti-aging agent are added when the polybutylene adipate/terephthalate, the polylactic acid and the crystallization initiator are added.
Third aspect, this application adopts a biodegradable express delivery wrapping bag, adopts following technical scheme:
a biodegradable express packaging bag is prepared from the biodegradable plastic through a film blowing process.
Under the action of film blowing, the crystallization initiator in the biodegradable plastic is easier to be in a flat-paved state, so that a multi-layer lamellar crystal structure is generated, the crystallization growth effect of the poly (butylene adipate)/terephthalate and the polylactic acid can be improved, the express packaging bag can obtain a better stretching effect, and the water and air blocking capacity of the express packaging bag can be improved.
In summary, the present application has the following beneficial effects:
1. in the process of cooling and shaping the mixture of the polybutylene adipate/terephthalate and the polylactic acid, the crystallization initiator can promote the mixture of the polybutylene adipate/terephthalate and the polylactic acid to grow and crystallize towards the horizontal direction in the sheet structure of the crystallization initiator, so that the crystallization performance of the mixture of the polybutylene adipate/terephthalate and the polylactic acid is improved, and the breaking force and the tensile strength of the biodegradable plastic are further improved.
2. The particle size of the intermediate silica in the step (1) is controlled to be 250-325 meshes, and after secondary grinding, the particle size of the intermediate silica in the water slurry is 3-5 mu m, so that a laminated sheet-shaped silica product with lower particle size can be obtained.
3. In the preparation process of the express packaging bag, the crystallization initiator is easier to be in a flat-paved state during film blowing, so that a multi-layer lamellar crystal structure is generated, the crystallization growth effect of the poly (butylene adipate)/terephthalate and the polylactic acid is favorably improved, and the tensile strength of the express packaging bag is favorably improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The starting materials used in the examples and comparative examples were commercially available, and the poly (butylene adipate/terephthalate) was obtained from Dongguan, a plastics chemical Co., ltd., model No. THJS-6802-E. Polylactic acid was purchased from suzhou renfu plastic ltd, model 6202D. The toughening agent is a polyester plasticizer which is purchased from Zuogao plastifying Co., ltd, fushan, with the model number of G1603. The antiaging agent is Pasteur antioxidant 1010, and the type is antioxidant AO-60 (1010). The polycarboxylate dispersant is the Rohm 9400 Rohm dispersant.
Example 1
A biodegradable plastic is composed of 8kg of polybutylene adipate/terephthalate, 1kg of polylactic acid and 2kg of a crystallization initiator.
The crystallization initiator consists of 35kg of silica intermediate product, 64.8kg of water and 0.2kg of dispersant, the dispersant is sodium hexametaphosphate, and the preparation method of the crystallization initiator comprises the following steps:
the method comprises the following steps of (1) crushing original silica ore by a jaw crusher and a hammer crusher in sequence, and continuously twisting a grinding classifier to carry out primary grinding to obtain a silica intermediate product, wherein the particle size of the silica intermediate product is 250 meshes;
and (2) adding 64.8kg of water and 0.2kg of sodium hexametaphosphate into a batching tank, stirring for 5min at the rotating speed of 60r/min to uniformly mix the water and the sodium hexametaphosphate, then adding the 35kg of the silica intermediate product prepared in the step (1) while stirring at the rotating speed of 20r/min to ensure that the silica intermediate product does not generate precipitate in the adding process to obtain slurry, pumping the slurry into an inlet at the lower part of a vertical grinding machine through a slurry pump to carry out secondary grinding, and operating a dispersion disc of the grinding machine at a high speed to drive a zirconium ball in the equipment to rotate. The slurry injected from the lower part is continuously ground in the process of rising, and finally overflows from an upper outlet to obtain water slurry, wherein the average particle size of the intermediate product of the silica in the water slurry is 8 mu m.
And (3) controlling the feeding speed of the slurry to be 12 tons/hour, pumping the slurry to an atomizer, atomizing the slurry into small droplets, simultaneously contacting the small droplets with hot air with the temperature of 360 ℃ and the speed of 5m/s, and drying to obtain the crystallization initiator. The water content of the crystallization initiator was 0.5%, the monomer diameter of the crystallization initiator was 1.5 μm, and the thickness was 0.15. Mu.m.
A method for preparing biodegradable plastic, comprising the following steps:
step one, 8kg of poly (butylene adipate)/terephthalate is dried for 5h at the temperature of 55-65 ℃,1kg of polylactic acid is dried for 7h at the temperature of 40-50 ℃, and 2kg of crystallization initiator is dried for 5h at the temperature of 75-85 ℃;
and step two, melting and blending the dried poly (butylene adipate/terephthalate), polylactic acid and crystallization initiator, extruding and granulating to obtain the biodegradable plastic.
Example 2
The difference from example 1 is that: the dispersant is polycarboxylate dispersant. In the step (2), 59.5kg of water and 0.5kg of polycarboxylate dispersant are added into a batching tank together, the mixture is stirred for 10min at the rotating speed of 50r/min, so that the water and the polycarboxylate dispersant are uniformly mixed, and then 40kg of the silica intermediate prepared in the step (1) is added into the batching tank at the rotating speed of 30r/min while stirring, so that the silica intermediate is prevented from generating precipitation in the adding process, and slurry is obtained.
Example 3
The difference from example 2 is that: in the step (2), after the secondary grinding, the particle size of the silica intermediate in the water slurry is 5 μm.
The process conditions in the step (3) are not changed, the water content of the obtained crystallization initiator is 0.5%, the monomer diameter of the crystallization initiator is 1.3 mu m, and the thickness of the obtained crystallization initiator is 0.15 mu m.
Example 4
The difference from example 2 is that: in the step (2), after the secondary grinding, the particle size of the silica intermediate in the water slurry is 3 μm.
The process conditions in the step (3) are unchanged, the water content of the obtained crystallization initiator is 0.5%, the monomer diameter of the crystallization initiator is 1.1 mu m, and the thickness of the obtained crystallization initiator is 0.15 mu m.
Example 5
The difference from example 4 is that: in the step (3), the feeding speed of the water slurry is controlled to be 9 tons/hour, the water slurry is pumped to an atomizer and atomized into small droplets, and simultaneously the small droplets are contacted with hot air with the temperature of 370 ℃ and the speed of 8m/s, and the hot air is dried to obtain the crystallization initiator. The water content of the crystallization initiator was 0.3%, the monomer diameter of the crystallization initiator was 0.9 μm, and the thickness was 0.12. Mu.m.
Example 6
The difference from example 4 is that: in the step (3), the feeding speed of the water slurry is controlled to be 10.5 tons/hour, the water slurry is pumped to an atomizer and atomized into small droplets, and simultaneously the small droplets are contacted with hot air with the temperature of 380 ℃ and the speed of 8m/s, and the hot air is dried to obtain the crystallization initiator. The water content of the crystallization initiator was 0.1%, the monomer diameter of the crystallization initiator was 0.7 μm, and the thickness was 0.8. Mu.m.
Example 7
The differences from example 5 are: 0.5kg of toughening agent and 0.3kg of anti-aging agent are also added into the biodegradable plastic.
In the first step of the preparation method of the biodegradable plastic, 0.5kg of the toughening agent is dried at 55 ℃ for 7h, and 0.3kg of the anti-aging agent is dried at 55 ℃ for 5h.
Example 8
The difference from example 7 is that: the biodegradable plastic consists of 5.5kg of poly (butylene adipate/terephthalate), 1.5kg of polylactic acid, 3.0kg of crystallization initiator, 1kg of toughening agent and 0.5kg of anti-aging agent.
A method for preparing biodegradable plastic, comprising the following steps:
step one, 5.5kg of poly (butylene adipate)/terephthalate is dried at 55 ℃ for 5h,1.5kg of polylactic acid is dried at 40 ℃ for 7h,3kg of crystallization initiator is dried at 75 ℃ for 5h,1kg of toughening agent is dried at 55 ℃ for 5h, and 0.5kg of anti-aging agent is dried at 55 ℃ for 7h.
And step two, melting and blending the dried poly (butylene adipate/terephthalate), polylactic acid, crystallization initiator, toughening agent and anti-aging agent, and extruding and granulating to obtain the biodegradable plastic.
Comparative example 1
The difference from example 2 is that: in the step (1), the particle size of the silica intermediate product is 100 meshes.
Comparative example 2
The difference from example 2 is that: in the step (2), the particle size of the silica intermediate product in the water slurry is 12 μm.
Comparative example 3
The difference from example 2 is that: in the step (3), the water content of the crystallization initiator is 1%, the monomer diameter of the crystallization initiator is 2 μm, and the thickness is 2 μm.
Application example 1
A biodegradable express packaging bag is prepared by drying the biodegradable plastic prepared in example 1 at 50 ℃ for 5 hours and then blowing a film through a film blowing machine.
Application examples 2 to 8
The difference from application example 1 is that: the biodegradable plastics prepared in example 1 were replaced by the biodegradable plastics prepared in examples 2 to 8, respectively, in equal amounts, as detailed in table 1.
Comparative application examples 1 to 3
The difference from application example 1 is that: the biodegradable plastics prepared in comparative examples 1 to 3 were used in place of the biodegradable plastics prepared in example 1 in equal amounts, as detailed in Table 1.
TABLE 1
Experiment 1
The express packaging bags prepared by detecting application examples and comparative application examples according to GB/T1040.3-2006 have the sample width of 15mm, and the test results are expressed by the tensile force and the tensile strength at the speed of 500mm/min by using an i-STRENREF intelligent electronic tensile testing machine.
The results are detailed in Table 2.
TABLE 2
According to the comparison of the data of the application example 2 and the comparative application example 1 in the table 2, the particle size of the silica intermediate product in the step (1) is controlled to be 250 meshes, and the tensile force and the tensile strength of the sample are obviously improved, so that the particle size of the silica intermediate product in the step (1) is controlled to be 250 meshes to 325 meshes, and the crystallization effect of the crystallization initiator is favorably improved, so that after the polylactic acid and the poly adipic acid/butylene terephthalate are added into the crystallization initiator, the crystallization nucleation and the crystallization growth effects of the polylactic acid and the poly adipic acid/butylene terephthalate are improved, and the tensile force and the tensile strength of the sample are obviously improved.
According to the comparison of the data of the example 2 and the comparative application example 2 in the table 2, the particle size of the silica intermediate product in the water slurry in the step (2) is controlled to be 3-8 μm, and the tensile force and the tensile strength of the sample are obviously improved, so that the control of the particle size of the silica intermediate product to be 3-8 μm in the preparation process of the crystallization initiator is proved to be beneficial to improving the promotion effect of the crystallization initiator on the crystallization of the polylactic acid and the poly adipic acid/butylene terephthalate, so that the nucleation number and the crystallization production effect of the polylactic acid and the poly adipic acid/butylene terephthalate are improved, and further the tensile force and the tensile strength of the sample are obviously improved.
According to the comparison of the data of the example 2 and the comparative application example 3 in the table 2, the water content, the monomer diameter and the thickness of the crystallization initiator in the step (3) are controlled, so that the tensile force and the tensile strength of the sample are obviously improved, and the water content, the monomer diameter and the thickness of the crystallization initiator are controlled within a certain range, so that the nucleation number and the crystal growth effect of the polylactic acid and the poly (butylene adipate/terephthalate) can be improved, the macro-structure of the sample is changed, and the breaking force and the tensile strength of the sample are improved.
According to the comprehensive comparison of the data of the example 2 and the comparative application examples 1 to 3 in the table 2, in the preparation process of the crystallization initiator, the grain size of the silica intermediate product in the step (1) and the step (2) and the water content, the monomer grain size and the thickness of the crystallization initiator in the step (3) are controlled, so that the nucleation number and the crystal growth effect of the sample are improved, the macroscopic structure of the sample is changed, and the tensile strength and the breaking force of the sample are improved.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. A biodegradable plastic characterized in that: the paint comprises the following components in parts by mass:
55-80 parts of poly (butylene adipate/terephthalate)
10-15 parts of polylactic acid
20-30 parts of a crystallization initiator;
the preparation method of the crystallization initiator comprises the following steps:
crushing and primary grinding raw silica ore to obtain a silica intermediate product;
step (2), uniformly mixing water and a dispersing agent, adding a silica intermediate product while stirring, and grinding for the second time to obtain water slurry, wherein the silica intermediate product accounts for 35-40% by mass, the dispersing agent accounts for 0.2-0.5% by mass, and the balance is water;
and (3) drying the water slurry to obtain a crystallization initiator, wherein the water content of the crystallization initiator is lower than 0.5%, the monomer diameter of the crystallization initiator is 0.8-1.5 mu m, and the thickness of the crystallization initiator is 0.08-0.15 mu m.
2. A biodegradable plastic according to claim 1, characterized in that: the particle size of the silica intermediate product is 250-325 meshes, and after the secondary grinding, the particle size of the silica intermediate product in the water slurry is 3-5 mu m.
3. A biodegradable plastic according to claim 1, characterized in that: the water slurry is prepared by spray drying: controlling the feeding speed of the water slurry to be 9-12 tons/hour, atomizing the water slurry into small droplets, and simultaneously contacting with hot air with the temperature of 360-380 ℃ and the speed of 5-8m/s to obtain the crystallization initiator.
4. A biodegradable plastic according to claim 1, characterized in that: in the step (2), the rotating speed is 20-30r/min when the silica intermediate product is added while stirring.
5. A biodegradable plastic according to claim 1, characterized in that: the dispersant is polycarboxylate dispersant.
6. A biodegradable plastic according to claim 1, characterized in that: the biodegradable plastic also comprises the following components in parts by weight:
5-10 parts of toughening agent
3-5 parts of anti-aging agent.
7. A method for preparing a biodegradable plastic according to claim 1, characterized in that: the method comprises the following steps:
step one, respectively drying poly (butylene adipate/terephthalate), polylactic acid and a crystallization initiator for 5-7h at 55-65 ℃, 40-50 ℃ and 75-85 ℃;
and step two, melting and blending the dried poly (butylene adipate/terephthalate), polylactic acid and crystallization initiator, extruding and granulating to obtain the biodegradable plastic.
8. The method for preparing biodegradable plastic according to claim 7, wherein: in the second step, 5-10 parts by mass of toughener and 3-5 parts by mass of age resister are added when the poly (butylene adipate)/terephthalate), the polylactic acid and the crystallization initiator are added.
9. The utility model provides a biodegradable express delivery wrapping bag which characterized in that: biodegradable plastic according to any of claims 1-6 or prepared according to any of claims 7-8, produced by a blown film process.
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Citations (4)
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|---|---|---|---|---|
| WO2015057694A2 (en) * | 2013-10-16 | 2015-04-23 | Metabolix, Inc. | Optically clear biodegradable oplyester blends |
| WO2019155398A1 (en) * | 2018-02-07 | 2019-08-15 | Csir | Biodegradable plastic |
| CN111621239A (en) * | 2020-05-16 | 2020-09-04 | 中国科学院理化技术研究所 | Full-biodegradable adhesive tape and preparation method thereof |
| CN111944287A (en) * | 2020-08-17 | 2020-11-17 | 江苏碧升生物新材料有限公司 | Preparation method of high-transparency easy-tearing polylactic acid blown film |
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2021
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015057694A2 (en) * | 2013-10-16 | 2015-04-23 | Metabolix, Inc. | Optically clear biodegradable oplyester blends |
| WO2019155398A1 (en) * | 2018-02-07 | 2019-08-15 | Csir | Biodegradable plastic |
| CN111621239A (en) * | 2020-05-16 | 2020-09-04 | 中国科学院理化技术研究所 | Full-biodegradable adhesive tape and preparation method thereof |
| CN111944287A (en) * | 2020-08-17 | 2020-11-17 | 江苏碧升生物新材料有限公司 | Preparation method of high-transparency easy-tearing polylactic acid blown film |
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Effective date of registration: 20240410 Address after: 361000 10 10 1001, Xinglin Wan Road, Jimei District, Xiamen, Fujian. Patentee after: Xiamen Jingcheng Wantai New Materials Co.,Ltd. Country or region after: China Address before: 363900 Guanshan Industrial Zone, Wu'an Town, Changtai County, Zhangzhou City, Fujian Province Patentee before: Fujian Changtai Wantai mineral products Co.,Ltd. Country or region before: China |