CN117962255A - Forming process and device of polylactic acid composite material - Google Patents
Forming process and device of polylactic acid composite material Download PDFInfo
- Publication number
- CN117962255A CN117962255A CN202410096549.9A CN202410096549A CN117962255A CN 117962255 A CN117962255 A CN 117962255A CN 202410096549 A CN202410096549 A CN 202410096549A CN 117962255 A CN117962255 A CN 117962255A
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- heating
- polylactic acid
- plate
- composite material
- die
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- 239000004626 polylactic acid Substances 0.000 title claims abstract description 40
- 229920000747 poly(lactic acid) Polymers 0.000 title claims abstract description 39
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 86
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 20
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 238000000465 moulding Methods 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 8
- 235000019738 Limestone Nutrition 0.000 claims abstract description 7
- 229920002472 Starch Polymers 0.000 claims abstract description 7
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 7
- 239000006028 limestone Substances 0.000 claims abstract description 7
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052919 magnesium silicate Inorganic materials 0.000 claims abstract description 7
- 235000019792 magnesium silicate Nutrition 0.000 claims abstract description 7
- 239000000391 magnesium silicate Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 235000019698 starch Nutrition 0.000 claims abstract description 7
- 239000008107 starch Substances 0.000 claims abstract description 7
- 238000002425 crystallisation Methods 0.000 claims abstract description 6
- 230000008025 crystallization Effects 0.000 claims abstract description 6
- 238000001125 extrusion Methods 0.000 claims abstract description 4
- 238000005469 granulation Methods 0.000 claims abstract description 4
- 230000003179 granulation Effects 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 238000009413 insulation Methods 0.000 claims description 32
- 239000007788 liquid Substances 0.000 claims description 8
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 6
- 239000012745 toughening agent Substances 0.000 claims description 5
- ZMKVBUOZONDYBW-UHFFFAOYSA-N 1,6-dioxecane-2,5-dione Chemical compound O=C1CCC(=O)OCCCCO1 ZMKVBUOZONDYBW-UHFFFAOYSA-N 0.000 claims description 3
- QLZHNIAADXEJJP-UHFFFAOYSA-N Phenylphosphonic acid Chemical compound OP(O)(=O)C1=CC=CC=C1 QLZHNIAADXEJJP-UHFFFAOYSA-N 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 235000011187 glycerol Nutrition 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000010899 nucleation Methods 0.000 claims description 3
- 230000006911 nucleation Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000000344 soap Substances 0.000 claims description 3
- 229920005586 poly(adipic acid) Polymers 0.000 claims description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 2
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims 2
- 239000001384 succinic acid Substances 0.000 claims 1
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000004310 lactic acid Substances 0.000 description 2
- 235000014655 lactic acid Nutrition 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- AXKZIDYFAMKWSA-UHFFFAOYSA-N 1,6-dioxacyclododecane-7,12-dione Chemical compound O=C1CCCCC(=O)OCCCCO1 AXKZIDYFAMKWSA-UHFFFAOYSA-N 0.000 description 1
- CKXDKAOBYWWYEK-UHFFFAOYSA-N 1,6-dioxecane-2,5-dione;hexanedioic acid Chemical compound OC(=O)CCCCC(O)=O.O=C1CCC(=O)OCCCCO1 CKXDKAOBYWWYEK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- GMPCVWPKHFTZLH-UHFFFAOYSA-N butanedioic acid;1,6-dioxacyclododecane-7,12-dione Chemical compound OC(=O)CCC(O)=O.O=C1CCCCC(=O)OCCCCO1 GMPCVWPKHFTZLH-UHFFFAOYSA-N 0.000 description 1
- 238000012993 chemical processing Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C45/7331—Heat transfer elements, e.g. heat pipes
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C45/7312—Construction of heating or cooling fluid flow channels
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C2045/7393—Heating or cooling of the mould alternately heating and cooling
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Thermal Sciences (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The application discloses a molding process and a molding device of a polylactic acid composite material, wherein the molding process of the polylactic acid composite material comprises the following steps: step one: preparing a polylactic acid composite material master batch, wherein the master batch comprises 80-85% of starch, limestone, hydrous magnesium silicate, 10% of polylactic acid base material and 5-10% of auxiliary agent, and the preparation of the master batch is completed through high-temperature stirring, normal-temperature drying and dispersing, extrusion and granulation and drying; step two: injecting the mixture into a temperature-changing die, heating the die before and during master batch injection to the crystallization temperature of the polylactic acid composite material, rapidly cooling after injection, and completing plasticization of the product, and demolding; step three: and repeating the first step and the second step according to production requirements, wherein the upper die and the lower die of the polylactic acid composite material forming process device are respectively provided with a cooling system for cooling the die, the upper die is provided with a heating assembly for heating the upper die and the material injection head, the heating assembly is arranged in the upper die in a sliding manner, and the temperature of the heating assembly is automatically adjusted according to the position of the heating assembly.
Description
Technical Field
The application relates to the technical field of chemical processing, in particular to a molding process and a molding device of a polylactic acid composite material.
Background
Polylactic acid (PLA) is a polymer obtained by polymerizing lactic acid as a main raw material. The polylactic acid has no pollution in the production process and can be biodegraded, so that the polylactic acid is widely applied to the fields of injection molding and the like. However, the existing polylactic acid has poor heat resistance, mechanical properties, formability and the like, and the defects limit the use of PLA in packaging products. In addition, the existing polylactic acid products are usually put into special annealing equipment for annealing treatment after being molded and released, and the annealing mode not only needs to increase equipment cost, but also has complex production steps and low production efficiency.
The existing heatable and coolable die often exists, the heating component needs to be closed during cooling, the die is heated again after cooling is completed, the service life of the heating wire can be greatly reduced due to frequent start and stop, and the heating wire needs to be replaced frequently.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides a molding process and a molding device of a polylactic acid composite material.
The technical scheme adopted for solving the technical problems is as follows: the molding process of the polylactic acid composite material comprises the following steps: step one: preparing a polylactic acid composite material master batch, wherein the master batch comprises 80-85% of starch, limestone, hydrous magnesium silicate, 10% of polylactic acid base material and 5-10% of auxiliary agent, and the preparation of the master batch is completed through high-temperature stirring, normal-temperature drying and dispersing, extrusion and granulation and drying; step two: injecting the mixture into a temperature-changing die, heating the die to the crystallization temperature of the polylactic acid composite material before and during master batch injection, rapidly cooling after injection, and completing plasticization of the product, and demolding; step three: repeating the first step and the second step according to the production requirement.
In some embodiments, the adjunct is a mixture of a compatibilizer, glycerin, and phenylphosphonic acid soaps that aids in the uniform dispersion of starch, limestone, and hydrous magnesium silicate, and which, in combination, forms an entangled network within the composite matrix providing a plurality of heterogeneous nucleation sites.
In some embodiments, a toughening agent is added, which is one or more of poly (butylene adipate/terephthalate), poly (butylene succinate-adipate), poly (butylene succinate).
The molding process device of the polylactic acid composite material comprises an upper die, a lower die and an injection head, wherein the lower surface of the upper die is in contact with the upper surface of the lower die to form a containing cavity, and the injection head extends into the containing cavity to be used for filling the master batch; the upper die and the lower die are respectively provided with a cooling system for cooling the die, the upper die is provided with a heating component for heating the upper die and the injection head, the heating component is arranged in the upper die in a sliding manner, and the temperature of the heating component is automatically adjusted according to the position of the heating component.
In some embodiments, the upper die comprises a first limiting plate, a second limiting plate and an upper die, the upper die is matched with the lower die, the heating assembly is movably arranged on the second limiting plate, the heating assembly comprises a driving device and a heating plate, the driving device is fixedly arranged on the first limiting plate, an output part of the driving device is fixedly connected with the heating plate, and the heating plate longitudinally moves under the action of the driving device.
In some embodiments, a sliding rheostat is fixedly arranged on the first limiting plate, a heating wire is arranged at the bottom of the heating plate, a guide rod is arranged on the heating plate, the guide rod extends out of the first limiting plate and is connected with a sliding block of the sliding rheostat, and the sliding rheostat is connected with the heating wire in series.
In some embodiments, the driving device drives the heating plate to approach the upper die, the sliding block slides under the action of the guide rod, the resistance value of the sliding rheostat connected to the circuit becomes smaller, and the temperature of the heating wire is increased; the driving device drives the heating plate to be far away from the upper die, the sliding block slides under the action of the guide rod, the resistance value of the sliding rheostat connected to the circuit is increased, and the temperature of the heating wire is reduced.
In some embodiments, the lower die comprises a lower die, a third limiting plate and a fourth limiting plate, the cooling system is respectively arranged in the upper die and the lower die, the cooling system comprises a liquid inlet, a liquid outlet and a flow pipeline, the flow pipeline is arranged outside the accommodating cavity, and an ejector plate is arranged in the fourth limiting plate and used for ejecting products after die separation.
In some embodiments, the heat insulation assembly is further provided, the heat insulation assembly comprises a heat insulation plate, an expansion plate and a first elastic component, the expansion plate is arranged inside the heat insulation plate through the first elastic component, the second limiting plate is provided with a fixed pulley, the heating plate bypasses the fixed pulley through a connecting wire to be connected with the heat insulation plate, and the heating plate longitudinally rises to drive the heat insulation plate to be transversely inwards.
In some embodiments, the heat insulation board is provided with a sliding groove, a sliding connecting rod is arranged in the sliding groove, one side of the sliding connecting rod is connected with the connecting rope, the other side of the sliding connecting rod is connected with the heat insulation board through a second elastic component, the expansion board is provided with a guide convex part, and the sliding connecting rod pushes the guide convex part to enable the expansion board to extend outwards.
The application has the beneficial effects that: the heating component is far away from the upper die and synchronously reduces the temperature when cooling is needed, so that the cooling time of the cooling system is shorter, the production time is further shortened, the production efficiency is improved, and further, the heating component is further provided with a heat insulation plate which stretches into the lower part of the heating component when being far away from.
Drawings
The application will be further described with reference to the drawings and examples.
Fig. 1 is a schematic view of an elevation of the present application.
Fig. 2 is a schematic view of the structure of the explosion of fig. 1 according to the present application.
Fig. 3 is an enlarged view of a portion of fig. 2a of the present application.
Fig. 4 is a schematic view of the structure of the inside of fig. 1 according to the present application.
Fig. 5 is a partial enlarged view of the present application at B of fig. 4.
Fig. 6 is a schematic view of the structure of the inside of another section of fig. 1 of the present application.
Fig. 7 is a partial enlarged view of fig. 6C of the present application.
Fig. 8 is a schematic view of the structure of the inside of the heat insulating board of the present application after it is extended.
Fig. 9 is a partial enlarged view of the application at D of fig. 8.
In the drawings, 1, upper die, 11, first limiting plate, 12, second limiting plate, 13, upper die, 2, lower die, 21, lower die, 22, third limiting plate, 23, fourth limiting plate, 24, ejector plate, 3, heating component, 31, driving device, 32, heating plate, 33, heating wire, 34, sliding rheostat, 35, guide rod, 36, slider, 4, cooling system, 41, liquid inlet, 42, liquid outlet, 43, flow channel, 5, injection head, 6, heat insulation component, 61, heat insulation plate, 62, expansion plate, 621, guide convex part, 63, first elastic component, 64, fixed pulley, 65, connecting wire, 66, sliding groove, 67, sliding connecting rod, 68, second elastic component.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present application.
Referring to fig. 1-9, in a specific embodiment of the present application, the process for forming a lactic acid composite material according to the present application includes the following steps:
step one: preparing a polylactic acid composite material master batch, wherein the master batch comprises 80-85% of starch, limestone, hydrous magnesium silicate, 10% of polylactic acid base material and 5-10% of auxiliary agent, and the preparation of the master batch is completed through high-temperature stirring, normal-temperature drying and dispersing, extrusion and granulation and drying;
Step two: injecting the mixture into a temperature-changing die, heating the die to the crystallization temperature of the polylactic acid composite material before and during master batch injection, rapidly cooling after injection, and completing plasticization of the product, and demolding;
Step three: repeating the first step and the second step according to the production requirement.
As a preferred embodiment, the adjunct is a mixture of a compatibilizer, glycerin and phenylphosphonic acid soaps, which aids in the uniform dispersion of starch, limestone and hydrous magnesium silicate, and which together form an entangled network within the matrix of the composite material providing a plurality of heterogeneous nucleation sites.
As a preferred embodiment, a toughening agent is added, wherein the toughening agent is one or more of poly (adipic acid)/poly (butylene terephthalate), poly (succinic acid-butylene adipate) and poly (butylene succinate), and the master batch is blended with PLA to prepare the PLA composite material, so that the in-mold rapid crystallization of the PLA composite material is realized, and the problems of brittleness, slow crystallization and poor heat resistance of the PLA are solved.
In order to obtain high-quality plastic parts and ensure the production efficiency of the plastic parts, the molding surface of a cavity is required to reach the temperature required by the process in the shortest time as much as possible, and the temperature changing die has good temperature uniformity, and comprises an upper die 1, a lower die 2 and a material injection head 5, wherein the lower surface of the upper die 1 is contacted with the upper surface of the lower die 2 to form a containing cavity, and the material injection head 5 stretches into the containing cavity to be used for filling the master batch; the upper die 1 and the lower die 2 are respectively provided with a cooling system 4 for cooling the dies, the upper die 1 is provided with a heating component 3 for heating the upper die 1 and a material injection head 5, the heating component 3 is arranged in the upper die 1 in a sliding manner, and the temperature of the heating component 3 is automatically adjusted according to the position of the heating component.
As a preferred embodiment, the upper die 1 includes a first limiting plate 11, a second limiting plate 12 and an upper die 13, the upper die 13 is matched with the lower die 2, the heating assembly 3 is movably disposed on the second limiting plate 12, the heating assembly 3 includes a driving device 31 and a heating plate 32, the driving device 31 is fixedly disposed on the first limiting plate 11, an output portion of the driving device 31 is fixedly connected with the heating plate 32, and the heating plate 32 moves longitudinally under the action of the driving device 31.
In order to enable the heating plate 32 to automatically adjust the temperature of the heating wire 33 along with the change of the position thereof, namely, when the temperature is far away from the upper die 13, the temperature is reduced, and when the temperature is close to the upper die, the temperature is increased, the first limiting plate 11 is fixedly provided with a slide rheostat 34, the bottom of the heating plate 32 is provided with the heating wire 33, the heating plate 32 is provided with a guide rod 35, the guide rod 35 extends out of the first limiting plate 11 and is connected with a slide block 36 of the slide rheostat 34, the slide rheostat 34 is connected with the heating wire 33 in series,
Further, the driving device 31 drives the heating plate 32 to approach the upper die 13, the sliding block 36 slides under the action of the guide rod 35, the resistance value of the sliding rheostat 34 connected to the circuit becomes smaller, and the temperature of the heating wire 33 increases; the driving device 31 drives the heating plate 32 to be far away from the upper die 13, the sliding block 36 slides under the action of the guide rod 35, the resistance value of the sliding rheostat 34 connected to the circuit is increased, and the temperature of the heating wire 33 is reduced.
In order to enable the product to complete plasticizing demolding faster, a cooling system 4 is arranged, the lower die 2 comprises a lower die 21, a third limiting plate 22 and a fourth limiting plate 23, the cooling system 4 is respectively arranged in the upper die 13 and the lower die 21, the cooling system 4 comprises a liquid inlet 41, a liquid outlet 42 and a flow pipeline 43, the flow pipeline 43 is arranged outside the accommodating cavity, and an ejector plate 24 is arranged in the fourth limiting plate 23 and is used for ejecting the product after die separation.
As a preferred embodiment, a heat insulation assembly 6 is further provided, the heat insulation assembly 6 comprises a heat insulation plate 61, an expansion plate 62 and a first elastic component 63, the expansion plate 62 is arranged inside the heat insulation plate 61 through the first elastic component 63, the second limiting plate 12 is provided with a fixed pulley 64, the heating plate 32 bypasses the fixed pulley 64 through a connecting wire 65 to be connected with the heat insulation plate 61, and the heating plate 32 is longitudinally lifted to drive the heat insulation plate 61 to be transversely inwards.
Specifically, the heat insulation board 61 is provided with a sliding groove 66, a sliding connecting rod 67 is arranged in the sliding groove 66, one side of the sliding connecting rod 67 is connected with the connecting rope, the other side of the sliding connecting rod 67 is connected with the heat insulation board 61 through a second elastic component 68, the expansion board 62 is provided with a guide convex part 621, and the sliding connecting rod 67 pushes the guide convex part 621 to enable the expansion board 62 to extend outwards.
Specifically, when the heating assembly 3 ascends, the heat insulation plate 61 will firstly lean against the edge of the heating assembly 3 due to the thickness of the heating assembly 3, at this time, the second elastic component 68 stretches under the action of the connecting rope, when the heating assembly 3 and the heat insulation plate 61 do not contact, the heat insulation plate 61 stretches into between the heating assembly 3 and the upper die 13, and when the heat insulation plate 61 is completely in place, the sliding connecting rod 67 pushes the expansion plate 62 to stretch out outwards under the action of the connecting rope, so as to cover the heating assembly 3 with a larger area, and realize more efficient heat insulation.
The foregoing description of the preferred embodiments of the application is not intended to limit the application in any way, but rather to make simple modifications, equivalent variations or modifications without departing from the technical scope of the application.
Claims (10)
1. The molding process of the polylactic acid composite material is characterized by comprising the following steps of:
step one: preparing a polylactic acid composite material master batch, wherein the master batch comprises 80-85% of starch, limestone, hydrous magnesium silicate, 10% of polylactic acid base material and 5-10% of auxiliary agent, and the preparation of the master batch is completed through high-temperature stirring, normal-temperature drying and dispersing, extrusion and granulation and drying;
Step two: injecting the mixture into a temperature-changing die, heating the die to the crystallization temperature of the polylactic acid composite material before and during master batch injection, rapidly cooling after injection, and completing plasticization of the product, and demolding;
Step three: repeating the first step and the second step according to the production requirement.
2. The process of claim 1, wherein the auxiliary agent is a mixture of a compatibilizer, glycerin and phenylphosphonic acid soap, wherein the auxiliary agent helps starch, limestone and hydrous magnesium silicate to disperse uniformly, and wherein the auxiliary agent together form an entangled network in the matrix of the composite material, providing a plurality of heterogeneous nucleation sites.
3. The process for molding the polylactic acid composite material according to claim 1, wherein a toughening agent is added, and the toughening agent is one or more of poly (adipic acid)/poly (butylene terephthalate), poly (succinic acid) -poly (butylene adipate) and poly (butylene succinate).
4. A molding process device of a polylactic acid composite material, which is a temperature changing die as claimed in any one of claims 1 to 3, and is characterized by comprising an upper die, a lower die and a material injection head, wherein the lower surface of the upper die is contacted with the upper surface of the lower die to form a containing cavity, and the material injection head extends into the containing cavity to be used for filling the master batch;
The upper die and the lower die are respectively provided with a cooling system for cooling the die, the upper die is provided with a heating component for heating the upper die and the injection head,
The heating component is arranged in the upper die in a sliding manner, and the temperature of the heating component is automatically adjusted according to the position of the heating component.
5. The molding process device of the polylactic acid composite material according to claim 4, wherein the upper die comprises a first limiting plate, a second limiting plate and an upper die, the upper die is matched with the lower die, the heating assembly is movably arranged on the second limiting plate, the heating assembly comprises a driving device and a heating plate, the driving device is fixedly arranged on the first limiting plate, an output part of the driving device is fixedly connected with the heating plate, and the heating plate longitudinally moves under the action of the driving device.
6. The molding process device of the polylactic acid composite material according to claim 5, wherein a sliding rheostat is fixedly arranged on the first limiting plate, a heating wire is arranged at the bottom of the heating plate, a guide rod is arranged on the heating plate, the guide rod extends out of the first limiting plate and is connected with a sliding block of the sliding rheostat, and the sliding rheostat is connected with the heating wire in series.
7. The molding process device of the polylactic acid composite material according to claim 6, wherein the driving device drives the heating plate to be close to the upper die, the sliding block slides under the action of the guide rod, the resistance value of the sliding rheostat connected to the circuit is reduced, and the temperature of the heating wire is increased; the driving device drives the heating plate to be far away from the upper die, the sliding block slides under the action of the guide rod, the resistance value of the sliding rheostat connected to the circuit is increased, and the temperature of the heating wire is reduced.
8. The molding process device of the polylactic acid composite material according to claim 5, wherein the lower die comprises a lower die, a third limiting plate and a fourth limiting plate, the cooling system is respectively arranged in the upper die and the lower die, the cooling system comprises a liquid inlet, a liquid outlet and a flow pipeline, the flow pipeline is arranged outside the accommodating cavity, and an ejector plate is arranged in the fourth limiting plate and used for ejecting products after die separation.
9. The molding process device of the polylactic acid composite material according to claim 5, further comprising a heat insulation assembly, wherein the heat insulation assembly comprises a heat insulation plate, an expansion plate and a first elastic component, the expansion plate is arranged inside the heat insulation plate through the first elastic component, the second limiting plate is provided with a fixed pulley, the heating plate bypasses the fixed pulley through a connecting wire and is connected with the heat insulation plate, and the heating plate is longitudinally lifted to drive the heat insulation plate to be transversely inwards.
10. The molding process device of the polylactic acid composite material according to claim 9, wherein the heat insulation plate is provided with a sliding groove, a sliding connecting rod is arranged in the sliding groove, one side of the sliding connecting rod is connected with the connecting rope, the other side of the sliding connecting rod is connected with the heat insulation plate through a second elastic component, the expansion plate is provided with a guide convex part, and the sliding connecting rod pushes the guide convex part to enable the expansion plate to extend outwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410096549.9A CN117962255A (en) | 2024-01-24 | 2024-01-24 | Forming process and device of polylactic acid composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410096549.9A CN117962255A (en) | 2024-01-24 | 2024-01-24 | Forming process and device of polylactic acid composite material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117962255A true CN117962255A (en) | 2024-05-03 |
Family
ID=90849263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410096549.9A Pending CN117962255A (en) | 2024-01-24 | 2024-01-24 | Forming process and device of polylactic acid composite material |
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