CN114133714A - Preparation method and device of high-temperature-resistant polylactic acid straw - Google Patents
Preparation method and device of high-temperature-resistant polylactic acid straw Download PDFInfo
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- CN114133714A CN114133714A CN202110782137.7A CN202110782137A CN114133714A CN 114133714 A CN114133714 A CN 114133714A CN 202110782137 A CN202110782137 A CN 202110782137A CN 114133714 A CN114133714 A CN 114133714A
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- 229920000747 poly(lactic acid) Polymers 0.000 title claims abstract description 207
- 239000004626 polylactic acid Substances 0.000 title claims abstract description 207
- 239000010902 straw Substances 0.000 title claims abstract description 115
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 54
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 23
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000003484 crystal nucleating agent Substances 0.000 claims description 5
- 229920001896 polybutyrate Polymers 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 4
- -1 5-sulfoisophthalic acid dibenzyl ester methyl ester Chemical class 0.000 claims description 3
- KUMNEOGIHFCNQW-UHFFFAOYSA-N diphenyl phosphite Chemical compound C=1C=CC=CC=1OP([O-])OC1=CC=CC=C1 KUMNEOGIHFCNQW-UHFFFAOYSA-N 0.000 claims description 3
- 239000013013 elastic material Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- PRQBJPGIUOLASY-UHFFFAOYSA-L zinc phenylphosphinate Chemical compound [Zn++].[O-]P(=O)c1ccccc1.[O-]P(=O)c1ccccc1 PRQBJPGIUOLASY-UHFFFAOYSA-L 0.000 claims description 3
- IQCOLQMWTXWAAB-UHFFFAOYSA-N P([O-])([O-])[O-].C1(=CC=CC=C1)[Zn+].C1(=CC=CC=C1)[Zn+].C1(=CC=CC=C1)[Zn+] Chemical compound P([O-])([O-])[O-].C1(=CC=CC=C1)[Zn+].C1(=CC=CC=C1)[Zn+].C1(=CC=CC=C1)[Zn+] IQCOLQMWTXWAAB-UHFFFAOYSA-N 0.000 claims description 2
- 238000002425 crystallisation Methods 0.000 abstract description 7
- 230000008025 crystallization Effects 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 description 18
- 239000013078 crystal Substances 0.000 description 14
- 239000002245 particle Substances 0.000 description 8
- 238000001035 drying Methods 0.000 description 5
- 238000005215 recombination Methods 0.000 description 5
- 230000006798 recombination Effects 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 235000013361 beverage Nutrition 0.000 description 4
- 235000013305 food Nutrition 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 244000269722 Thea sinensis Species 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
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- 239000000047 product Substances 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
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- 241000335053 Beta vulgaris Species 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 240000003183 Manihot esculenta Species 0.000 description 1
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 description 1
- 240000000111 Saccharum officinarum Species 0.000 description 1
- 235000007201 Saccharum officinarum Nutrition 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 235000021536 Sugar beet Nutrition 0.000 description 1
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- 238000010521 absorption reaction Methods 0.000 description 1
- 229920003232 aliphatic polyester Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 235000019698 starch Nutrition 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
-
- 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
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Biological Depolymerization Polymers (AREA)
Abstract
The invention discloses a preparation method and a device of a high-temperature-resistant polylactic acid straw, wherein 5-30 parts by weight of talcum powder is added into 100 parts by weight of polylactic acid, the mesh number of the talcum powder is 500-8000 meshes, and modified polylactic acid is obtained after uniform mixing; extruding the modified polylactic acid by using a straw extruder to obtain a polylactic acid straw; the polylactic acid suction pipe is placed in a device for preparing the high-temperature-resistant polylactic acid suction pipe, an infrared heater is used for heating the polylactic acid suction pipe, the heating temperature is controlled to be 60-145 ℃, and the heating time is 15-600 s. The device for preparing the high-temperature-resistant polylactic acid straw takes the infrared heater as a heat source, and can quickly reach the set temperature of the polylactic acid straw placed in the setting space, reach the set heating time, finish crystallization and quickly cool the polylactic acid straw to room temperature. The method of the invention heats the molded polylactic acid straw for cold crystallization, thereby obtaining the high temperature resistant polylactic acid straw.
Description
Technical Field
The invention relates to the technical field of degradable materials, in particular to a preparation method and a device of a high-temperature-resistant polylactic acid straw.
Background
Many beverage establishments have used paper straws in place of previous plastic straws. However, the paper straw has good water absorption, and the phenomenon of soft collapse and breakage can occur when the straw is soaked in beverages (particularly hot beverages) for a long time, so that the user experience is greatly reduced.
There are also some beverage companies that have pushed out degradable PLA straws. Polylactic acid (PLA), also known as polylactide, is a thermoplastic aliphatic polyester derived from renewable materials, usually from fermented plant starches, such as corn, tapioca, sugar cane or beet pulp. In 2010, polylactic acid became the second most highly consumed biomass plastic in the world. The polylactic acid is applied to preparing the beverage straws, and the defect that the polylactic acid cannot resist high temperature (only can resist 60 ℃) needs to be solved. The PLA straws currently marketed are made of about 40% PLA, 10% talc and 50% PBS and can withstand high temperatures around 80 ℃. Many hot beverages, however, tend to be at temperatures above 80 c and the PLA straws currently in use are not able to meet their needs. Furthermore, along with the popularization of this kind of PLA straw, PBS's price straight-line rises, and this kind of production cost that makes this kind of PLA straw is far higher than the paper straw, is unfavorable for the popularization of degradable PLA straw.
Disclosure of Invention
The invention aims to provide a preparation method for obtaining a high-temperature-resistant polylactic acid straw by heating and performing cold crystallization on a molded polylactic acid straw.
In order to achieve the purpose, the invention adopts the technical scheme that: a preparation method of a high-temperature-resistant polylactic acid straw comprises the following steps:
1) preparing modified polylactic acid: adding 5-30 parts by weight of talcum powder and 1-10 parts by weight of PBAT or PBS into 100 parts by weight of polylactic acid, wherein the mesh number of the talcum powder is at least 500 meshes, and uniformly mixing to obtain modified polylactic acid;
2) preparing the polylactic acid straw: extruding the modified polylactic acid by using a straw extruder to obtain a polylactic acid straw;
3) preparing a high-temperature-resistant polylactic acid straw: and heating the polylactic acid suction pipe by adopting a high-temperature-resistant polylactic acid preparation device, controlling the heating temperature to be 60-145 ℃, and heating for 15-600 s to obtain the high-temperature-resistant polylactic acid suction pipe.
Preferably, in the step of producing the modified polylactic acid, the polylactic acid has a melting point of 168 ℃ or higher and an optical levorotatory purity of 99% or higher. The polylactic acid has high regularity, and the crystallinity after heating is obviously higher than that of a finished product prepared from other polylactic acid.
Preferably, in the preparation step of the modified polylactic acid, 0.1-1 part by weight of an organic crystal nucleating agent is further added to the polylactic acid.
Preferably, the organic crystal nucleating agent comprises one or more of talcum powder, phenyl zinc phosphite, zinc phenylphosphinate, 3, 5-disulfobenzoate dimethyl salt, 5-sulfoisophthalic acid dibenzyl ester methyl ester and diphenyl phosphite.
Preferably, in the preparation step of the modified polylactic acid, the polylactic acid and the talcum powder are dried before being mixed, and the drying temperature of the polylactic acid and the drying temperature of the talcum powder are both 55-98 ℃.
Preferably, the mesh number of the talcum powder is 1250-3000 meshes, and in the step of preparing the high-temperature-resistant polylactic acid straw, the heating temperature is 90-135 ℃, and the heating time is 60-600 s.
Preferably, the mesh number of the talcum powder is 1250-3000 meshes, and in the step of preparing the high-temperature-resistant polylactic acid straw, the heating temperature is 100-130 ℃, and the heating time is 100-200 s.
Preferably, the infrared heater is arranged on the high-temperature-resistant polylactic acid preparation device, the high-temperature-resistant polylactic acid preparation device comprises a base, a conveying assembly and a feeding assembly arranged on the base, the conveying assembly is provided with the infrared heater, and the infrared heater is used for heating the polylactic acid suction pipe;
the conveying assembly comprises a conveying piece and a plurality of supporting rods, one end of each supporting rod is fixedly connected with the conveying piece, the conveying piece is used for driving the supporting rods to move, the other end of each supporting rod is a free end, and the supporting rods are used for providing supporting force for the polylactic acid suction pipes;
the feeding assembly comprises a feeding part and a first driving part, the feeding part is used for containing the polylactic acid suction pipe, and the first driving part is used for pushing the polylactic acid suction pipe on the feeding part so that the polylactic acid suction pipe is sleeved on the supporting rod.
Preferably, the feeding part comprises a feeding hopper and a tube placing plate, the feeding hopper comprises a storage cavity and a discharge port, the discharge port is arranged towards the tube placing plate, the discharge port can only discharge one polylactic acid suction tube at a time, and the tube placing plate is provided with a groove matched with the polylactic acid suction tube;
the feeding assembly further comprises a push plate, the push plate is fixedly connected with the first driving piece, and the first driving piece is used for driving the push plate to linearly reciprocate in the length direction of the supporting rod;
the feeding assembly further comprises a sliding rail arranged on the base and a supporting frame arranged on the sliding rail, the sliding rail is connected with the supporting frame in a sliding mode, and the push plate is fixedly connected with the first driving piece through the supporting frame.
Preferably, the preparation device of the high-temperature-resistant polylactic acid straw further comprises a material taking assembly, wherein the material taking assembly is used for taking the crystallized polylactic acid straw down from the supporting rod;
the material taking assembly comprises a rotating wheel and a rotating driving source for driving the rotating wheel to rotate, and the distance between the rotating wheel and the supporting rod is smaller than the pipe wall thickness of the crystallized polylactic acid suction pipe so that the rotating wheel drives the crystallized polylactic acid suction pipe to be separated from the supporting rod;
the rotating wheel is made of elastic materials; the surface of the rotating wheel, which can be contacted with the crystallized polylactic acid suction pipe, is provided with threads;
get the material subassembly and be equipped with two at least, one sets up and is being close to the junction of bracing piece and conveying piece, one sets up and is being close to the free end of bracing piece.
Compared with the prior art, the invention has the beneficial effects that: in the process of extruding and molding the modified polylactic acid particles by adopting a straw extruder, the original crystal structure in the modified polylactic acid particles is damaged under the action of force, and the molecules are stretched and arranged along the direction of an external force field, namely the molecules are arranged along the direction parallel to the central axis of the straw. When the polylactic acid suction pipe is heated by an infrared heater, the talc powder particles uniformly distributed in the polylactic acid are used as the center, the crystal structure of polylactic acid molecules is rearranged, and the recombined crystal form is alpha. The infrared heater can reach 100% power output within 5s, and can rapidly provide energy for polylactic acid molecules to carry out crystal structure recombination. Can be rapidly cooled after reaching the heating time, and prevents the crystal structure from recovering to a disordered state in the slow cooling process. Furthermore, the infrared heater can uniformly heat all parts of the polylactic acid straw, thereby preventing the quality problems of different heat resistance, straw shape deformation and the like caused by different crystallinity of all parts of the polylactic acid straw.
Drawings
FIG. 1 is a perspective view of a device for manufacturing a high temperature resistant polylactic acid straw;
FIG. 2 is an enlarged view of a portion a of FIG. 1;
FIG. 3 is another perspective view of the manufacturing device of the high temperature resistant polylactic acid straw;
figure 4 is a perspective view of a portion of the base, the loading assembly and the take-off assembly.
Description of reference numerals: 1. a base; 2. a transfer assembly; 21. a conveying member; 22. a support bar; 3. a feeding assembly; 31. placing a tube plate; 311. a groove; 32. a first driving member; 33. feeding a hopper; 35. a support frame; 36. a slide rail; 37. pushing the plate; 4. a material taking assembly; 41. a rotation drive source; 42. a rotating wheel.
Detailed Description
The present invention will be described in further detail with reference to examples. In which like parts are designated by like reference numerals. It should be noted that as used in the following description, the terms "front," "back," "left," "right," "upper," and "lower" refer to directions in the drawings, and the terms "bottom" and "top," "inner," and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Example 1:
1) 100 parts by weight of polylactic acid (produced by Thailand total-cobion company, the melting point is more than 168 ℃, and the optical levorotatory purity is more than 99%), 10 parts by weight of 3000-mesh talcum powder and 5 parts by weight of PBAT; drying the polylactic acid matrix, the talcum powder and the PBAT by using an oven respectively, wherein the drying temperature is 55 ℃;
2) after drying, carrying out mixing granulation by using a double-screw extrusion granulation production line (Nanjing Asia 65 model) to obtain modified polylactic acid particles;
3) performing straw extrusion processing on the modified polylactic acid particles by using a straw extruder (Nanjing Jixuan 50 type) to obtain a milk tea straw with the caliber of 11 mm;
4) performing cold crystallization process operation on the milk tea straw by using an infrared heater, wherein the heating temperature is set to be 120 ℃, and the heating time is set to be 100 seconds; and after the cold crystallization is finished, obtaining the high-temperature-resistant polylactic acid straw. The crystallinity detection result of the high-temperature-resistant polylactic acid straw is 35%, and the Vicat temperature detection result is 99 ℃.
In the process of extruding and molding the modified polylactic acid particles by adopting a straw extruder, the original crystal structure in the modified polylactic acid particles is damaged under the action of force, and the molecules are stretched and arranged along the direction of an external force field, namely the molecules are arranged along the direction parallel to the central axis of the straw. When the polylactic acid suction pipe is heated by an infrared heater, the crystal structure of polylactic acid molecules is rearranged (cold crystallization) by taking talcum powder particles uniformly distributed in the polylactic acid as a center, and the recombined crystal form is alpha. The infrared heater can reach 100% power output within 5s, and can rapidly provide energy for polylactic acid molecules to carry out crystal structure recombination. Can be rapidly cooled after reaching the heating time, and prevents the crystal structure from recovering to a disordered state in the slow cooling process. Furthermore, the infrared heater can uniformly heat all parts of the polylactic acid straw, thereby preventing the quality problems of different heat resistance, straw shape deformation and the like caused by different crystallinity of all parts of the polylactic acid straw. Meanwhile, in the process of the polylactic acid crystal structure recombination, the four factors of the organic crystal nucleating agent, the mesh number of the talcum powder, the heating temperature and the heating time are cooperated to influence the crystal structure recombination result, and the four factors cannot be determined respectively in a mode of determining an optimal value through a single-factor test. And finally, mixing and granulating the dried polylactic acid and the talcum powder, wherein no micro water drop exists in the extruded straw, so that the polylactic acid molecule is prevented from carrying out crystal structure recombination by taking the micro water drop as the center in the cold crystallization process (the fluidity of the micro water drop is far greater than that of the talcum powder, and the recombined crystal structure is still disordered).
Meanwhile, the PBS material has defects in food contact safety, isocyanate solution residue is easily generated in the polymerization process, tetrahydrofuran is a side reaction product, and the two substances are non-food contact substances and influence on the food contact safety. The polylactic acid straw provided by the invention does not contain or contains a small amount of PBS, so that the cost can be reduced, and the food safety of the polylactic acid straw can be improved.
The device comprises a high-temperature-resistant polylactic acid preparation device, an infrared heater, a feeding assembly and a feeding assembly, wherein the infrared heater is arranged on the high-temperature-resistant polylactic acid preparation device, as shown in figures 1-3, the high-temperature-resistant polylactic acid preparation device comprises a base 1, a conveying assembly 2 and the feeding assembly 3 arranged on the base 1, the infrared heater is arranged on the conveying assembly 2, and the infrared heater is used for heating a polylactic acid suction pipe;
as shown in fig. 2, the conveying assembly 2 includes a conveying member 21 and a plurality of support rods 22, one end of each support rod 22 is fixedly connected to the conveying member 21, the conveying member 21 is configured to drive the support rod 22 to move, the other end of each support rod 22 is a free end, and the support rod 22 is configured to provide a supporting force for the polylactic acid straw;
as shown in fig. 4, the feeding assembly 3 includes a feeding member for accommodating the polylactic acid straw, and a first driving member 32 for pushing the polylactic acid straw on the feeding member so that the polylactic acid straw is sleeved on the supporting rod.
The first driving piece in the feeding assembly pushes the polylactic acid suction pipe on the feeding piece to the direction close to the supporting rod so that the polylactic acid suction pipe is sleeved on the supporting rod, and the supporting rod provides supporting force for the polylactic acid suction pipe so as to prevent the polylactic acid suction pipe from deforming in the heating process, so that the yield of the suction pipe is improved. The structure that the polylactic acid suction pipe can be pushed to move to be sleeved on the support rod in the prior art is within the protection scope of the invention, for example, the first driving piece is a linear stepping motor or an air cylinder or a device consisting of a plurality of other structures.
As another example, as shown in fig. 3, the feeding member includes a feeding hopper 33 and a tube placing plate 31, the feeding hopper 33 includes a storage cavity and a discharge port, the discharge port is disposed toward the tube placing plate 31, the discharge port can only discharge one polylactic acid suction tube at a time, the polylactic acid suction tubes in the feeding hopper are positioned and fed on the tube placing plate 31 under the action of gravity, so that the polylactic acid suction tubes can be conveniently pushed and sleeved on the support rods by the first driving member, and the tube placing plate 31 is provided with a groove 311 adapted to the polylactic acid suction tubes;
the feeding assembly 3 further comprises a push plate 37, the push plate 37 is fixedly connected with the first driving member 32, and the first driving member 32 is used for driving the push plate to linearly reciprocate in the length direction of the support rod 22;
the feeding assembly 3 further comprises a slide rail 36 arranged on the base 1 and a support frame 35 arranged on the slide rail 36, the slide rail 36 is slidably connected with the support frame 35, and the push plate 37 is fixedly connected with the first driving piece 32 through the support frame.
As another example, the device for preparing the high temperature resistant polylactic acid straw further comprises a material taking component 4, wherein the material taking component 4 is used for taking the crystallized polylactic acid straw off the support rod 22;
the material taking assembly 4 comprises a rotating wheel 42 and a rotating driving source 41 for driving the rotating wheel 42 to rotate, and the distance between the rotating wheel 42 and the supporting rod 22 is smaller than the pipe wall thickness of the crystallized polylactic acid straw so that the rotating wheel 42 drives the crystallized polylactic acid straw to be separated from the supporting rod 22;
the runner 42 is made of an elastic material; the surface of the rotating wheel 42 which can be contacted with the crystallized polylactic acid suction pipe is provided with threads;
the material taking assembly 4 is at least provided with two materials, one material taking assembly is arranged at the position close to the connecting part of the supporting rod 22 and the conveying member 21, and the other material taking assembly is arranged at the free end close to the supporting rod 22.
As another example, the take-out assembly 4 further includes an exit bin disposed below the wheel 42.
As another example, the discharging box is movably connected with the base 1.
As another example, the infrared heater is an infrared lamp tube, and the infrared lamp tube is provided in plurality and uniformly distributed around the supporting rod 22.
The working principle is as follows: the polylactic acid suction pipe falls to the groove 311 on the tube placing plate 31 from the discharge hole of the feeding hopper 33 under the action of gravity, and the groove 311 has a limiting effect on the polylactic acid suction pipe due to the fact that the groove 311 is matched with the polylactic acid suction pipe in size. The first driving member 32 (coming into contact with the protruding groove 311 portion of the polylactic acid straw) pushes the polylactic acid straw to move linearly until the polylactic acid straw is sleeved on the supporting rod 22, and the supporting rod 22 provides a supporting force for the polylactic acid straw to prevent the polylactic acid straw from deforming during the heating process. The polylactic acid suction pipe heated by the infrared heater is conveyed to the position near the material taking assembly 4, and the pipe wall of the crystallized polylactic acid suction pipe is contacted with the rotating wheel 42 so as to drive the crystallized polylactic acid suction pipe to fall off from the supporting rod 22, thereby realizing the discharge of the product.
Example 2:
the difference from example 1 is that: polylactic acid was instead produced by Anhufeng original biotechnology, Inc. The crystallinity of the obtained high-temperature-resistant polylactic acid straw is detected to be 34%, and the Vicat temperature is detected to be 97 ℃.
Example 3:
the difference from example 1 is that: the mesh number of the talcum powder is 500 meshes, the heating temperature of the polylactic acid straw by the infrared heater is 100 ℃, the heating time is 250s, the crystallinity detection result of the obtained high-temperature-resistant polylactic acid straw is 24%, and the Vicat temperature detection result is 84 ℃.
Example 4:
the difference from example 1 is that: the addition amount of the talcum powder is 5 parts by weight. The crystallinity detection result of the obtained high-temperature-resistant polylactic acid straw is 20%, and the Vicat temperature detection result is 78 ℃.
Example 5:
the difference from example 1 is that: the addition amount of the talcum powder is 30 parts by weight, the mesh number of the talcum powder is 1250 meshes, and the heating time is 60 s. The crystallinity of the obtained high-temperature-resistant polylactic acid straw is detected to be 30%, and the Vicat temperature is detected to be 95 ℃.
Example 6:
the difference from example 1 is that: the addition amount of the talcum powder is 20 parts by weight. The mesh number of the talcum powder is 2000 meshes, 0.6 weight part of diphenyl phosphite is added, and the heating temperature of the infrared heater to the polylactic acid straw is 110 ℃ and the heating time is 40 seconds. The crystallinity of the obtained high-temperature-resistant polylactic acid straw is detected to be 39%, and the Vicat temperature is detected to be 106 ℃.
Example 7:
the difference from example 1 is that: the addition amount of the talcum powder is 20 parts by weight. The heating temperature of the sliding infrared heater to the polylactic acid straw is 90 ℃, and the heating time is 360 seconds. The crystallinity of the obtained high-temperature-resistant polylactic acid straw is detected to be 38%, and the Vicat temperature is detected to be 105 ℃.
Example 8:
the difference from example 1 is that: the addition amount of the talcum powder is 20 parts by weight. The mesh number of the talcum powder is 2000 meshes, and the heating time of the polylactic acid suction pipe by the infrared heater is 600 seconds. The crystallinity detection result of the obtained high-temperature-resistant polylactic acid straw is 40%, and the Vicat temperature detection result is 108 ℃.
Example 9:
the difference from example 1 is that: the addition amount of the talcum powder is 20 parts by weight. The heating temperature of the infrared heater to the polylactic acid straw is 60 ℃. The crystallinity of the high-temperature-resistant polylactic acid straw is detected to be 23%, and the Vicat temperature is detected to be 82 ℃.
Example 10:
the difference from example 1 is that: polylactic acid was instead produced by Anhufeng original biotechnology, Inc. The addition amount of the talcum powder is 20 parts by weight. The heating temperature of the infrared heater to the polylactic acid straw is 135 ℃, and the heating time is 200 seconds. The crystallinity of the high-temperature-resistant polylactic acid straw is detected to be 10%, and the Vicat temperature is detected to be 68 ℃.
Example 11:
the difference from example 1 is that: polylactic acid was instead produced by Anhufeng original biotechnology, Inc. The addition amount of the talcum powder is 20 parts by weight. The heating temperature of the infrared heater to the polylactic acid straw is 130 ℃, and the heating time is 100 seconds. The crystallinity detection result of the high-temperature-resistant polylactic acid straw is 35%, and the Vicat temperature detection result is 99 ℃.
Example 12:
the difference from example 1 is that: polylactic acid was instead produced by Anhufeng original biotechnology, Inc. The addition amount of polylactic acid is 80 parts by weight, and the addition amount of talcum powder is 20 parts by weight. The heating temperature of the infrared heater to the polylactic acid straw is 130 ℃, and the heating time is 300 seconds. The crystallinity detection result of the high-temperature-resistant polylactic acid straw is 22%, and the Vicat temperature detection result is 85 ℃.
Example 13:
the difference from example 1 is that: polylactic acid was instead produced by Anhufeng original biotechnology, Inc. The additive amount of polylactic acid is 80 parts by weight, the additive amount of talcum powder is 20 parts by weight, the mesh number of the talcum powder is 8000 meshes, and 0.7 part by weight of 5-sulfoisophthalic acid dibenzyl ester methyl ester is added. The heating temperature of the infrared heater to the polylactic acid straw is 115 ℃, and the heating time is 15 seconds. The crystallinity of the high-temperature-resistant polylactic acid straw is detected to be 26 percent, and the Vicat temperature is detected to be 89 ℃.
Example 14:
the difference from example 1 is that: polylactic acid was instead produced by Anhufeng original biotechnology, Inc. The adding amount of the polylactic acid is 95 parts by weight, the adding amount of the talcum powder is 5 parts by weight, and the mesh number of the talcum powder is 800 meshes. The heating temperature of the infrared heater to the polylactic acid straw is 115 ℃, and the heating time is 500 seconds. The crystallinity detection result of the high-temperature-resistant polylactic acid straw is 25%, and the Vicat temperature detection result is 88 ℃.
Example 15:
the difference from example 1 is that: polylactic acid was instead produced by Anhufeng original biotechnology, Inc. The additive amount of polylactic acid is 70 parts by weight, 4 parts by weight of PBS is added, 0.3 part by weight of zinc phenylphosphinate is added, the additive amount of talcum powder is 30 parts by weight, and the mesh number of the talcum powder is 3000 meshes. The heating temperature of the infrared heater to the polylactic acid straw is 115 ℃, and the heating time is 500 seconds. The crystallinity of the high-temperature-resistant polylactic acid straw is detected to be 36%, and the Vicat temperature is detected to be 102 ℃.
Comparative example 1:
the difference from example 15 is that: the polylactic acid straw is heated by adopting a heating wire heating mode. The crystallinity detection result of the high-temperature-resistant polylactic acid straw is 8%, and the Vicat temperature detection result is 62 ℃.
Comparative example 2:
the difference from example 15 is that: the adopted polylactic acid has a melting point of 150 ℃ and optical left-handed purity of 82%. The crystallinity detection result of the high-temperature-resistant polylactic acid straw is 7%, and the Vicat temperature detection result is 60 ℃.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. A preparation method of a high-temperature-resistant polylactic acid straw is characterized by comprising the following steps:
1) preparing modified polylactic acid: adding 5-30 parts by weight of talcum powder and 1-10 parts by weight of PBAT or PBS into 100 parts by weight of polylactic acid, wherein the mesh number of the talcum powder is at least 500 meshes, and uniformly mixing to obtain modified polylactic acid;
2) preparing the polylactic acid straw: extruding the modified polylactic acid by using a straw extruder to obtain a polylactic acid straw;
3) preparing a high-temperature-resistant polylactic acid straw: and heating the polylactic acid suction pipe by using an infrared heater, wherein the heating temperature is controlled to be 60-145 ℃, and the heating time is 15-600 s, so that the high-temperature-resistant polylactic acid suction pipe is obtained.
2. The method for manufacturing a high-temperature-resistant polylactic acid straw according to claim 1, wherein in the step of manufacturing the modified polylactic acid, the polylactic acid has a melting point of 168 ℃ or higher and an optical levorotatory purity of 99% or higher.
3. The method for preparing a high-temperature-resistant polylactic acid straw as claimed in claim 1, wherein in the step of preparing the modified polylactic acid, 0.1-1 part by weight of organic crystal nucleating agent is further added to the polylactic acid.
4. The method for manufacturing a high temperature resistant polylactic acid straw according to claim 3, wherein the organic crystal nucleating agent comprises one or more of talcum powder, phenyl zinc phosphite, zinc phenylphosphinate, 3, 5-disulfobenzoate dimethyl salt, 5-sulfoisophthalic acid dibenzyl ester methyl ester, and diphenyl phosphite.
5. The method for preparing a high temperature resistant polylactic acid straw as claimed in claim 1, wherein in the step of preparing the modified polylactic acid, the talc powder and the PBAT or PBS are all dried before being mixed.
6. The method for preparing the high-temperature-resistant polylactic acid straw as claimed in claim 3, wherein the mesh number of the talcum powder is 1250-3000 meshes, and in the step of preparing the high-temperature-resistant polylactic acid straw, the heating temperature is 90-135 ℃ and the heating time is 60-600 s.
7. The method for preparing the high-temperature-resistant polylactic acid straw as claimed in claim 1, wherein the mesh number of the talcum powder is 1250-3000 meshes, and in the step of preparing the high-temperature-resistant polylactic acid straw, the heating temperature is 100-130 ℃ and the heating time is 100-200 s.
8. The preparation method of the high-temperature-resistant polylactic acid straw according to claim 1, wherein the infrared heater is arranged on a high-temperature-resistant polylactic acid preparation device, the high-temperature-resistant polylactic acid preparation device comprises a base (1), a conveying assembly (2) and a feeding assembly (3) arranged on the base (1), the conveying assembly (2) is provided with the infrared heater, and the infrared heater is used for heating the polylactic acid straw;
the conveying assembly (2) comprises a conveying piece (21) and a plurality of supporting rods (22), one end of each supporting rod (22) is fixedly connected with the conveying piece (21), the conveying piece (21) is used for driving the supporting rods (22) to move, the other end of each supporting rod (22) is a free end, and the supporting rods (22) are used for providing supporting force for the polylactic acid suction pipes;
the feeding assembly (3) comprises a feeding part and a first driving part, the feeding part is used for containing the polylactic acid suction pipe, and the first driving part is used for pushing the polylactic acid suction pipe on the feeding part so that the polylactic acid suction pipe is sleeved on the supporting rod.
9. The device for preparing the high-temperature-resistant polylactic acid suction tube according to claim 8, wherein the feeding part comprises a feeding hopper (33) and a tube placing plate (31), the feeding hopper (33) comprises a storage cavity and a discharge hole, the discharge hole is arranged towards the tube placing plate (31), the discharge hole can only discharge one polylactic acid suction tube at a time, and a groove (311) matched with the polylactic acid suction tube is arranged on the tube placing plate (31);
the feeding assembly (3) further comprises a push plate (37), the push plate (37) is fixedly connected with the first driving piece (32), and the first driving piece (32) is used for driving the push plate to linearly reciprocate in the length direction of the supporting rod (22);
the feeding assembly (3) further comprises a sliding rail (36) arranged on the base (1) and a supporting frame (35) arranged on the sliding rail (36), the sliding rail (36) is connected with the supporting frame (35) in a sliding mode, and the pushing plate (37) is connected with the first driving piece (32) in a fixed mode through the supporting frame.
10. The device for preparing the high-temperature-resistant polylactic acid straw as claimed in claim 8, wherein the device for preparing the high-temperature-resistant polylactic acid straw further comprises a material taking assembly (4), wherein the material taking assembly (4) is used for taking the crystallized polylactic acid straw off the supporting rod (22);
the material taking assembly (4) comprises a rotating wheel (42) and a rotating driving source (41) for driving the rotating wheel (42) to rotate, and the distance between the rotating wheel (42) and the supporting rod (22) is smaller than the pipe wall thickness of the crystallized polylactic acid straw so that the rotating wheel (42) drives the crystallized polylactic acid straw to be separated from the supporting rod (22);
the runner (42) is made of an elastic material; the surface of the rotating wheel (42) which can be contacted with the crystallized polylactic acid suction pipe is provided with threads;
the material taking assembly (4) is at least provided with two materials, one material taking assembly is arranged at a position close to the joint of the supporting rod (22) and the conveying piece (21), and the other material taking assembly is arranged at a free end close to the supporting rod (22).
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