CN114407335A - Blow molding process for renewable polyester fiber with low density - Google Patents
Blow molding process for renewable polyester fiber with low density Download PDFInfo
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- CN114407335A CN114407335A CN202111606891.1A CN202111606891A CN114407335A CN 114407335 A CN114407335 A CN 114407335A CN 202111606891 A CN202111606891 A CN 202111606891A CN 114407335 A CN114407335 A CN 114407335A
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- polyester fiber
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- 229920000728 polyester Polymers 0.000 title claims abstract description 106
- 239000000835 fiber Substances 0.000 title claims abstract description 87
- 238000000071 blow moulding Methods 0.000 title claims abstract description 51
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 30
- 238000002156 mixing Methods 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000010103 injection stretch blow moulding Methods 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 15
- 239000004033 plastic Substances 0.000 claims description 12
- 229920003023 plastic Polymers 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 230000009477 glass transition Effects 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000000155 melt Substances 0.000 claims description 5
- 239000002243 precursor Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 5
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims 1
- 241000894006 Bacteria Species 0.000 abstract description 9
- 230000000844 anti-bacterial effect Effects 0.000 abstract description 7
- 125000004432 carbon atom Chemical group C* 0.000 abstract description 6
- 230000002401 inhibitory effect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000003993 interaction Effects 0.000 abstract description 3
- 235000015097 nutrients Nutrition 0.000 abstract description 3
- 230000035764 nutrition Effects 0.000 abstract description 3
- 235000016709 nutrition Nutrition 0.000 abstract description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 7
- 239000005020 polyethylene terephthalate Substances 0.000 description 7
- 229920001707 polybutylene terephthalate Polymers 0.000 description 4
- -1 polyethylene terephthalate Polymers 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 229920001230 polyarylate Polymers 0.000 description 3
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- WOZVHXUHUFLZGK-UHFFFAOYSA-N dimethyl terephthalate Chemical compound COC(=O)C1=CC=C(C(=O)OC)C=C1 WOZVHXUHUFLZGK-UHFFFAOYSA-N 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004660 morphological change Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 150000007519 polyprotic acids Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 229920006346 thermoplastic polyester elastomer Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/08—Biaxial stretching during blow-moulding
- B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
- B29C49/12—Stretching rods
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4823—Moulds with incorporated heating or cooling means
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4823—Moulds with incorporated heating or cooling means
- B29C2049/4825—Moulds with incorporated heating or cooling means for cooling moulds or mould parts
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
The invention discloses a blow molding process of renewable polyester fiber with low density, which comprises the steps of preparing the renewable polyester fiber as a raw material for blow molding; blending the regenerated polyester fiber and the low-melting-point polyester fiber, and then slicing; and performing blow molding on the slices in a two-step injection stretch blow molding mode to prepare a molded product. According to the invention, the graphene modified regenerated polyester fiber plays a good role in inhibiting the antibacterial property, carbon atoms in the graphene do not give the opportunity of nutrient interaction between bacteria and the outside, and even if the bacteria are not directly killed by the carbon atoms in the graphene, the bacteria can be finally lost due to the fact that nutrition cannot be supplied for a long time, so that the antibacterial property of the regenerated polyester fiber is excellent; and the low-density polyester fiber and the low-melting-point polyester fiber are combined to adopt a double-step injection stretch blow molding mode, so that the wall thickness of a blow molded product is uniform, the time is saved, and the production efficiency is increased.
Description
Technical Field
The invention belongs to the technical field of blow molding of renewable polyester fibers, and particularly relates to a blow molding process of renewable polyester fibers with low density.
Background
The polyester is a general term for a polymer obtained by polycondensation of a polyhydric alcohol and a polybasic acid. Mainly refers to polyethylene terephthalate (PET), and customarily also includes linear thermoplastic resins such as polybutylene terephthalate (PBT) and polyarylate, and is an engineering plastic with excellent performance and wide application. It can also be made into polyester fiber and polyester film. Polyesters include polyester resins and polyester elastomers. The polyester resin further includes polyethylene terephthalate (PET), polybutylene terephthalate (PBT), Polyarylate (PAR), and the like. Polyester elastomers (TPEE) are generally polymerized from dimethyl terephthalate, 1, 4-butanediol and polybutanol, and the segment comprising a hard segment portion and a soft segment portion is a thermoplastic elastomer.
At present, with the change of living habits of people, the application range and the demand of PET materials in the field of plastic bottle packaging are increasing day by day, various PET bottles are produced according to the change of preference of consumers, the processing method is also inexhaustible, injection stretch blow molding is one of the plastic bottle processing methods which are developed rapidly so far, and a series of problems of uneven wall thickness distribution, long forming time, poor antibacterial property and the like can occur in the processing process due to the fact that the materials undergo complicated and complicated morphological changes in the stretching process and a plurality of rheological parameters which are difficult to control exist in the process, and the production efficiency is influenced.
Therefore, it is necessary to invent a blow molding process of renewable polyester fiber with low density to solve the above problems.
Disclosure of Invention
In view of the above problems, the present invention provides a process for blow molding renewable polyester fibers having a low density to solve the problems set forth in the background art described above.
In order to achieve the purpose, the invention provides the following technical scheme: a process for blow molding renewable polyester fibers having low density comprising the steps of:
s1 preparation: preparing regenerated polyester fiber as a blow molding raw material;
raw material blending chip before S2 blow molding: blending the regenerated polyester fiber obtained in the step S1 with low-melting-point polyester fiber, and then slicing;
s3 blow molding: the cut piece in step S2 is blow molded using a two-step injection stretch blow molding method to prepare a molded product.
Further, the specific steps of preparing the recycled polyester fiber in the step S1 are as follows:
a: preparing 1-3% of graphene and the balance of low-density polyester chips, and preparing a chip dryer, a screw extruder and plastic pulverizer equipment;
b: and (2) crushing the low-density polyester chips into powder by using a plastic pulverizer, then scattering graphene into the low-density polyester powder, uniformly stirring and mixing, heating to a screw extruder, and separating out the raw materials by using the practical screw extruder to prepare the low-density regenerated polyester fiber modified by using the graphene.
Further, the specific steps of blending the recycled polyester fiber and the low-melting polyester fiber in the step S2 are as follows:
a: selecting 45-50% of low-melting-point polyester fiber and 50-55% of low-density regenerated polyester fiber modified by graphene, and then smashing the two fibers into powder;
b: b, placing the low-density regenerated polyester fiber powder obtained in the step a in a blast oven, drying for 1.5h at the temperature of 110 ℃, and then drying for 12h at the temperature of 100 ℃ in a vacuum oven for later use;
c: mechanically mixing the low-melting-point polyester fiber powder in the step a with the low-density regenerated polyester fiber powder in the step b according to the percentage, adding white oil in the mixing process, and stirring and mixing uniformly;
d: heating the blended polyester precursor to a double-screw extruder at the rotating speed of 25r/min at the temperature of 256-260 ℃, extruding, granulating and drying to obtain the low-density regenerated polyester fiber master batch.
Further, the specific steps of the two-step injection stretch blow molding in step S3 are as follows:
1): firstly, adding low-density regenerated polyester fiber master batches into a blow molding machine for dissolving, and then injecting a melt into a parison mold cavity by using an injection method to form a prefabricated blank;
2): injecting cooling water, keeping the upward vertical position of the mold core unchanged until the mold core is cooled to a temperature below the glass transition point, so that the blank is in an amorphous state, and finishing the process;
3): then gradually moving the mold cavity downwards, sending the blank to a temperature adjusting device of a blow molding machine through a rotary table for preheating, controlling the temperature of the blank between the glass transition point temperature and the melting temperature to enable the blank to be in a rubber-like state, and finishing the longitudinal stretching of the blank through the stretching force provided by a core rod device or a stretching device in the blow molding machine;
4): and (3) after delaying for 15min, introducing compressed gas to perform transverse stretching of the blank, finally realizing the close fit of the blank and the inner wall of the cavity of the mold, rapidly cooling the stretched and blown blank to below the glass state transition point temperature for molding, and opening the mold after cooling to obtain the required blow molding product.
Further, the glass transition point temperature is a temperature corresponding to a glass transition to a high elastic state, and a specific temperature value thereof is 65 to 70 ℃, preferably 69 ℃.
Further, the melting temperature is a fixed melting temperature of the solid matter existing in the crystal structure, and the specific temperature value is 260 ℃ and 280 ℃, and is preferably 280 ℃.
The invention has the technical effects and advantages that:
1. according to the invention, the graphene modified regenerated polyester fiber plays a good role in inhibiting the antibacterial property, carbon atoms in the graphene do not give the opportunity of nutrient interaction between bacteria and the outside, and even if the bacteria are not directly killed by the carbon atoms in the graphene, the bacteria can be finally lost due to the fact that nutrition cannot be supplied for a long time, so that the antibacterial property of the regenerated polyester fiber is excellent; and the low-density polyester fiber and the low-melting-point polyester fiber are combined to adopt a double-step injection stretch blow molding mode, so that the wall thickness of a blow molded product is uniform, the time is saved, and the production efficiency is increased.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the invention provides a renewable polyester fiber blow molding process with low density, which comprises the following steps:
s1 preparation: preparing 3% graphene and the balance of low-density polyester chips, and preparing a chip dryer, a screw extruder and plastic pulverizer equipment; crushing the low-density polyester chips into powder by using a plastic pulverizer, then scattering graphene into the low-density polyester powder, stirring and mixing uniformly, heating to a screw extruder, and separating out the raw materials by using the screw extruder to prepare the low-density regenerated polyester fiber modified by using the graphene;
raw material blending chip before S2 blow molding: selecting 50% of low-melting-point polyester fiber and 50% -55% of low-density regenerated polyester fiber modified by graphene, and then smashing the two fibers into powder; placing low-density regenerated polyester fiber powder in a blast oven, drying for 1.5h at 110 ℃, drying for 12h at 100 ℃ in a vacuum oven, then mechanically mixing with the low-melting polyester fiber powder according to the percentage, adding white oil in the mixing process, stirring and mixing uniformly, heating the blended polyester precursor into a double-screw extruder, extruding, granulating and drying at the rotating speed of 25r/min at the temperature of 256-260 ℃ to obtain low-density regenerated polyester fiber master batches;
s3 blow molding: firstly, adding low-density regenerated polyester fiber master batches into a blow molding machine for dissolving, and then injecting a melt into a parison mold cavity by using an injection method to form a prefabricated blank; injecting cooling water, keeping the upward vertical position of the mold core unchanged until the temperature is cooled to below 69 ℃ to enable the blank to be in an amorphous state, and ending the process; then gradually moving the mold cavity downwards, sending the blank to a temperature adjusting device of a blow molding machine through a rotary table for preheating, controlling the temperature of the blank to be between 69 ℃ and 280 ℃ so that the blank is in a rubber-like state, and finishing the longitudinal stretching of the blank through the stretching force provided by a core rod device or a stretching device in the blow molding machine; and (3) after delaying for 15min, introducing compressed gas to perform transverse stretching of the blank, finally realizing the close fit of the blank and the inner wall of the cavity of the mold, rapidly cooling the stretched and blown blank to below the glass state transition point temperature for molding, and opening the mold after cooling to obtain the required blow molding product.
Example 2:
the invention provides a renewable polyester fiber blow molding process with low density, which comprises the following steps:
s1 preparation: preparing 1% of graphene and the balance of low-density polyester chips, and preparing a chip dryer, a screw extruder and plastic pulverizer equipment; crushing the low-density polyester chips into powder by using a plastic pulverizer, then scattering graphene into the low-density polyester powder, stirring and mixing uniformly, heating to a screw extruder, and separating out the raw materials by using the screw extruder to prepare the low-density regenerated polyester fiber modified by using the graphene;
raw material blending chip before S2 blow molding: selecting 45% of low-melting-point polyester fiber and 50% -55% of low-density regenerated polyester fiber modified by graphene, and then smashing the two fibers into powder; placing low-density regenerated polyester fiber powder in a blast oven, drying for 1.5h at 110 ℃, drying for 12h at 100 ℃ in a vacuum oven, then mechanically mixing with the low-melting polyester fiber powder according to the percentage, adding white oil in the mixing process, stirring and mixing uniformly, heating the blended polyester precursor into a double-screw extruder, extruding, granulating and drying at the rotating speed of 25r/min at the temperature of 256-260 ℃ to obtain low-density regenerated polyester fiber master batches;
s3 blow molding: firstly, adding low-density regenerated polyester fiber master batches into a blow molding machine for dissolving, and then injecting a melt into a parison mold cavity by using an injection method to form a prefabricated blank; injecting cooling water, keeping the upward vertical position of the mold core unchanged until the temperature is cooled to below 69 ℃ to enable the blank to be in an amorphous state, and ending the process; then gradually moving the mold cavity downwards, sending the blank to a temperature adjusting device of a blow molding machine through a rotary table for preheating, controlling the temperature of the blank to be between 69 ℃ and 280 ℃ so that the blank is in a rubber-like state, and finishing the longitudinal stretching of the blank through the stretching force provided by a core rod device or a stretching device in the blow molding machine; and (3) after delaying for 15min, introducing compressed gas to perform transverse stretching of the blank, finally realizing the close fit of the blank and the inner wall of the cavity of the mold, rapidly cooling the stretched and blown blank to below the glass state transition point temperature for molding, and opening the mold after cooling to obtain the required blow molding product.
Example 3:
the invention provides a renewable polyester fiber blow molding process with low density, which comprises the following steps:
s1 preparation: preparing 2% graphene and the balance of low-density polyester chips, and preparing a chip dryer, a screw extruder and plastic pulverizer equipment; crushing the low-density polyester chips into powder by using a plastic pulverizer, then scattering graphene into the low-density polyester powder, stirring and mixing uniformly, heating to a screw extruder, and separating out the raw materials by using the screw extruder to prepare the low-density regenerated polyester fiber modified by using the graphene;
raw material blending chip before S2 blow molding: selecting 47% of low-melting-point polyester fiber and 50% -55% of low-density regenerated polyester fiber modified by graphene, and then smashing the two fibers into powder; placing low-density regenerated polyester fiber powder in a blast oven, drying for 1.5h at 110 ℃, drying for 12h at 100 ℃ in a vacuum oven, then mechanically mixing with the low-melting polyester fiber powder according to the percentage, adding white oil in the mixing process, stirring and mixing uniformly, heating the blended polyester precursor into a double-screw extruder, extruding, granulating and drying at the rotating speed of 25r/min at the temperature of 256-260 ℃ to obtain low-density regenerated polyester fiber master batches;
s3 blow molding: firstly, adding low-density regenerated polyester fiber master batches into a blow molding machine for dissolving, and then injecting a melt into a parison mold cavity by using an injection method to form a prefabricated blank; injecting cooling water, keeping the upward vertical position of the mold core unchanged until the temperature is cooled to below 69 ℃ to enable the blank to be in an amorphous state, and ending the process; then gradually moving the mold cavity downwards, sending the blank to a temperature adjusting device of a blow molding machine through a rotary table for preheating, controlling the temperature of the blank to be between 69 ℃ and 280 ℃ so that the blank is in a rubber-like state, and finishing the longitudinal stretching of the blank through the stretching force provided by a core rod device or a stretching device in the blow molding machine; and (3) after delaying for 15min, introducing compressed gas to perform transverse stretching of the blank, finally realizing the close fit of the blank and the inner wall of the cavity of the mold, rapidly cooling the stretched and blown blank to below the glass state transition point temperature for molding, and opening the mold after cooling to obtain the required blow molding product.
Example 4:
the molded products produced in examples 1 to 3 were examined for wall thickness, molding time and antibacterial property, and the results are shown in the following table:
| graphene | Low density PET | Low melting point PET | Wall thickness (mm) | Delay time | Antibacterial property | |
| 1 | 3% | 97%（50%） | 50% | 3.04 | 0.16 | 99 |
| 2 | 1% | 99%（55%） | 45% | 2.97 | 0.2 | 99 |
| 3 | 2% | 98%（53%） | 47% | 3.55 | 0.18 | 98 |
And (4) conclusion: through analysis and research of data in the table above, it is easy to see that the graphene modified regenerated polyester fiber plays a good role in inhibiting performance, carbon atoms in graphene do not give the opportunity of nutrient interaction between bacteria and the outside, and even if the bacteria are not directly killed by the carbon atoms in the graphene, the bacteria can be finally lost due to the fact that nutrition cannot be supplied for a long time, so that the inhibiting performance of the regenerated polyester fiber is excellent; and the low-density polyester fiber and the low-melting-point polyester fiber are combined to adopt a double-step injection stretch blow molding mode, so that the wall thickness of a blow molded product is uniform, the time is saved, and the production efficiency is increased.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. The blow molding process of the renewable polyester fiber with low density is characterized in that: the method comprises the following steps:
s1 preparation: preparing regenerated polyester fiber as a blow molding raw material;
raw material blending chip before S2 blow molding: blending the regenerated polyester fiber obtained in the step S1 with low-melting-point polyester fiber, and then slicing;
s3 blow molding: the cut piece in step S2 is blow molded using a two-step injection stretch blow molding method to prepare a molded product.
2. The renewable polyester fiber with low density blow molding process according to claim 1, characterized in that: the specific steps of preparing the recycled polyester fiber in step S1 are as follows:
a: preparing 1-3% of graphene and the balance of low-density polyester chips, and preparing a chip dryer, a screw extruder and plastic pulverizer equipment;
b: and (2) crushing the low-density polyester chips into powder by using a plastic pulverizer, then scattering graphene into the low-density polyester powder, uniformly stirring and mixing, heating to a screw extruder, and separating out the raw materials by using the practical screw extruder to prepare the low-density regenerated polyester fiber modified by using the graphene.
3. The renewable polyester fiber with low density blow molding process according to claim 2, characterized in that: the specific steps of blending the recycled polyester fibers and the low-melting-point polyester fibers in the step S2 are as follows:
a: selecting 45-50% of low-melting-point polyester fiber and 50-55% of low-density regenerated polyester fiber modified by graphene, and then smashing the two fibers into powder;
b: b, placing the low-density regenerated polyester fiber powder obtained in the step a in a blast oven, drying for 1.5h at the temperature of 110 ℃, and then drying for 12h at the temperature of 100 ℃ in a vacuum oven for later use;
c: mechanically mixing the low-melting-point polyester fiber powder in the step a with the low-density regenerated polyester fiber powder in the step b according to the percentage, adding white oil in the mixing process, and stirring and mixing uniformly;
d: heating the blended polyester precursor to a double-screw extruder at the rotating speed of 25r/min at the temperature of 256-260 ℃, extruding, granulating and drying to obtain the low-density regenerated polyester fiber master batch.
4. The renewable polyester fiber with low density blow molding process according to claim 3, wherein: the specific steps of the two-step injection stretch blow molding in step S3 are as follows:
: firstly, adding low-density regenerated polyester fiber master batches into a blow molding machine for dissolving, and then injecting a melt into a parison mold cavity by using an injection method to form a prefabricated blank;
: injecting cooling water, keeping the upward vertical position of the mold core unchanged until the mold core is cooled to a temperature below the glass transition point, so that the blank is in an amorphous state, and finishing the process;
: then gradually moving the mold cavity downwards, sending the blank to a temperature adjusting device of a blow molding machine through a rotary table for preheating, controlling the temperature of the blank between the glass transition point temperature and the melting temperature to enable the blank to be in a rubber-like state, and finishing the longitudinal stretching of the blank through the stretching force provided by a core rod device or a stretching device in the blow molding machine;
: and (3) after delaying for 15min, introducing compressed gas to perform transverse stretching of the blank, finally realizing the close fit of the blank and the inner wall of the cavity of the mold, rapidly cooling the stretched and blown blank to below the glass state transition point temperature for molding, and opening the mold after cooling to obtain the required blow molding product.
5. The renewable polyester fiber with low density blow molding process according to claim 4, wherein: the glass transition point temperature is the temperature corresponding to the glass transition into the high elastic state, and the specific temperature value is 65-70 ℃.
6. The renewable polyester fiber with low density blow molding process according to claim 4, wherein: the melting temperature is a fixed melting temperature of solid substances existing in a crystal structure, and the specific temperature value is 260-280 ℃.
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