CN110054878A - A kind of short fiber toughened crystalline polymer product of elastomer and preparation method thereof - Google Patents
A kind of short fiber toughened crystalline polymer product of elastomer and preparation method thereof Download PDFInfo
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- CN110054878A CN110054878A CN201910344663.8A CN201910344663A CN110054878A CN 110054878 A CN110054878 A CN 110054878A CN 201910344663 A CN201910344663 A CN 201910344663A CN 110054878 A CN110054878 A CN 110054878A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
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- 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
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
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- 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
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/16—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one other macromolecular compound obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds as constituent
Abstract
The invention discloses short fiber toughened crystalline polymer products of a kind of elastomer and preparation method thereof, it include: that 10%~30%:70%~90% mixes by mass percentage by thermoplastic elastomer (TPE) and crystalline resin raw material, it is granulated by double screw extruder melt blending, obtains that pellet is blended after dry；The melting temperature of thermoplastic elastomer (TPE) differs 10~20 DEG C with the melting temperature of crystalline resin raw material；Single screw extrusion machine is added in obtained blending pellet and carries out melting extrusion, extruded stock obtains 3D printing silk material by stretching and three sections of sink cooling treatments for the first time；Obtained 3D printing silk material is placed in fusion sediment moulding 3D printer, melt stretches in print procedure by second and third time stretches, and superposition forms three-dimensional structure on shaped platform, and cooling obtains the short fiber toughened crystalline polymer product of elastomer.The present invention has the characteristics that equipment is simple, processing technology is easy to control and can form complex geometry.
Description
Technical field
The present invention relates to high molecular polymer 3D printing consumptive material technical fields, and in particular to a kind of elastomer is short fiber toughened
Crystalline polymer product and preparation method thereof.
Background technique
Fento composite material (Micro Fibrillar Composites, MFCs) is a kind of to be favored by researcher
Composite material, this concept are to be proposed in 1992 by scientist Evstatiev and Fakirov.It, which can effectively improve, does not mix
The compatibility and mechanical property of phase co-mixing system.Relative to traditional blend polymer and composite material, MFCs has weight
Gently, the potential advantages such as easy to process, recyclable.Three steps are broadly divided into for the preparation of MFCs: firstly, melt blending,
It is secondary, it is stretched using single screw rod or twin-screw extrusion, finally, carrying out post-processing molding by molding or injection molding.
According to the length of fiber, fibre reinforced composites can be divided into continuously or discontinuously two kinds.Due to continuous fiber and
Significant difference of the discontinuous fibre in structure, it is contemplated that continuously or discontinuously fibre reinforced composites will have difference apparent
Mechanical property.From the perspective of macroscopic view, it is higher that people can it is expected that continuous fiber reinforced composite materials have than discontinuous fibre
Rigidity stress can be caused to concentrate because discontinuous fibre both ends around matrix, which exist, is similar to groove stress point.Institute
Will crack when stress level is suitable with the breaking strength of matrix.However, identical in polymer fiber content
In the case of, the quantity of discontinuous fibre is apparently higher than continuous fiber, and when crack tip attempted to transmitting fiber tow sowing time, more are discontinuous
Fiber, which works, prevents any crackle originating from bulk substrate.After a fibrous fracture, another staple fiber can make base
Stress in body, which is concentrated, to be minimized.In fact, in discontinuous fibre enhancing composite material, if a fibrous fracture is almost right
It is whole not influence, because crack tip can always encounter a kind of fiber that may prevent crack propagation.Accordingly it is possible to prevent
Crackle is propagated on the section of composite material, and then the mechanical property of composite material can be enhanced in discontinuous fibre.
Polylactic acid has excellent mechanical strength, and still, its impact strength is lower, limits its extensive use.For
Overcome this disadvantage, many scientists study the method for modifying of plasticizing polylactic acid.It can be mainly divided into chemistry to change
Property and physical modification, chemical method include: copolymerization, grafting, crosslinking etc.；Physical method specifically includes that filling, blending, enhancing etc..
In these methods, it has been widely studied by elastomeric thermoplastic's melt polyurethane blending toughening polylactic acid.But in tradition
Under processing conditions, dispersed phase polyurethane all can significantly improve the impact of polylactic acid with spherical or ellipsoid fractions distribution
Intensity.However, the sharp fall along with tensile strength of the raising of polylactic acid impact strength.Because polymer is blended multiple
The performance of condensation material depends not only on the physical property of its constituent component, and is highly dependent on dispersed phase morphology.So control
The phase morphology of this biocompatible thermoplastic's polyurethane has important scientific meaning.
It is many studies have shown that for the preparation of fento composite material require two kinds of polymer melting temperature have to differ by 30~
40 DEG C, otherwise can be when post-processing form, fiber is mutually destroyed.A kind of new method fusion sediment skill as machine-shaping
Art can effectively overcome this limitation, realize that the melting lesser polymer of the temperature difference is distributed in product at fibre, while can also be real
The molding of existing complex geometry.
Summary of the invention
For shortcoming existing for this field, for the limitation for overcoming traditional in-situ fiber composite material technology of preparing,
The present invention provides a kind of preparation method of the short fiber toughened crystalline polymer product of elastomer, processing simple with equipment
The features such as technique is easy to control and can form complex geometry.
A kind of preparation method of the short fiber toughened crystalline polymer product of elastomer, comprising:
(1) by thermoplastic elastomer (TPE) and crystalline resin raw material by mass percentage 10%~30%:70%~90% into
Row mixing, is granulated by double screw extruder melt blending, obtains that pellet is blended after dry；The melting of the thermoplastic elastomer (TPE)
Temperature differs 10~20 DEG C with the melting temperature of crystalline resin raw material；
(2) single screw extrusion machine is added in obtained blending pellet and carries out melting extrusion, extruded stock by stretching for the first time
And cooling treatment, obtain 3D printing silk material；
(3) obtained 3D printing silk material is placed in fusion sediment moulding 3D printer, melt passes through in print procedure
Second of stretching and third time stretch, and superposition forms three-dimensional structure on shaped platform, and cooling obtains the increasing of elastomer staple fiber
Tough crystalline polymer product.
In step (1), the thermoplastic elastomer (TPE) is elastomer into fine phase, and the crystalline resin raw material is
Crystallinity matrix phase.
Preferably, the thermoplastic elastomer (TPE) and crystalline resin raw material are first dried before mixing, to go to remove water
Influence of the part to mixed effect.
The melting temperature of the thermoplastic elastomer (TPE) is 150~190 DEG C.Preferably, the thermoplastic elastomer (TPE)
Melting temperature is 160~170 DEG C, is conducive to thermoplastic elastomer (TPE) and forms fibre structure in the base.
The melting temperature of the crystalline resin raw material is 160~210 DEG C.Preferably, the crystalline resin is former
The melting temperature of material is 170~180 DEG C, is conducive to fusion sediment machine-shaping.
Preferably, the thermoplastic elastomer (TPE) is thermoplastic polyurethane (TPU), and the crystalline resin raw material is poly-
Lactic acid (PLA).Two kinds of polymer has half compatibility, is conducive to interact between TPU and PLA into fibre.
The twin-screw revolving speed that the double screw extruder melt blending is granulated is 160~180r/min, blending temperature control
Be 170~200 DEG C, under this condition two components can abundant melting mixing, be evenly distributed conducive to the later period at fiber.
The diameter of the blending pellet is 1.3~2.5mm, and length is 5~7mm, is squeezed convenient for pellet is blended in single screw rod
Uniform feeding and discharging in machine out.
Preferably, in step (2), the cooling treatment is three sections of sink cooling treatments, first segment sink coolant water temperature
Degree is at least 55 DEG C, and second segment sink cooling water temperature is 40~50 DEG C, and third section sink cooling water temperature is room temperature.This condition
Under obtained 3D printing silk material surface it is smooth, circularity is higher, is conducive to later period printing shaping.
In step (2), the screw speed when single screw extrusion machine carries out melting extrusion is 6~10r/min, squeezes out temperature
Degree is 175~190 DEG C, and the diameter of 3D printing silk material can be effectively controlled in this condition, is conducive to print product accuracy and mechanical strength
Raising.
Preferably, the draw ratio that the single screw extrusion machine carries out melting extrusion is at least 4.28, is conducive to thermoplastic elastomehc
Property body is in crystalline resin raw polymer matrix at fibre.
Preferably, the diameter of the 3D printing silk material is 1.7~1.8mm, is conducive to printing nozzle uniform discharge, can be effective
Improve printed product quality.
In step (3), it is preferable that the melting extrusion draw ratio of the fusion sediment moulding 3D printer is 25~30,
It can avoid elastomeric fibre contraction distortion, continue to keep tensional state, elastomeric fibre is made to form staple fiber, be conducive to be promoted
Print the toughness of product processed.
The print temperature of the fusion sediment moulding 3D printer is 180~230 DEG C, and print speed is 20~70mm/
S, printing angle are 20~80 °.Preferably, the print temperature of the fusion sediment moulding 3D printer is 190~210 DEG C,
Print speed is 30~60mm/s, and printing angle is 40~50 °, conducive to the solidification that is uniformly distributed of elastomeric fibre, reduces printing
The defect of product.
The present invention also provides the preparation method systems of the short fiber toughened crystalline polymer product of elastomer described in one kind
The standby obtained short fiber toughened crystalline polymer product of elastomer.
Compared with prior art, the present invention major advantage includes:
(1) melt drawn is made full use of, realizes elastomer in the crystalline resin matrix similar in melting temperature at short fibre
Distribution.
(2) a kind of short fiber toughened crystallinity polymerization of elastomer is realized by the fused glass pellet in 3D printing technique
The preparation method of produce product.
Detailed description of the invention
Fig. 1 is elastomer polyurethane and crystalline polylactic acid melt blending of the invention, squeezes out stretching preparation 3D printing consumption
The flow diagram of material；
Fig. 2 is the stereoscan photograph of the fiber reinforced polylactic acid 3D printing standard sample of TPU prepared by embodiment 1；
Fig. 3 is the scanning electricity of elastomer polyurethane prepared by comparative example 1 and crystalline polylactic acid composite material injection-molded test specimens
Mirror photo.
Specific embodiment
With reference to the accompanying drawing and specific embodiment, the present invention is further explained.It should be understood that these embodiments are merely to illustrate
The present invention rather than limit the scope of the invention.In the following examples, the experimental methods for specific conditions are not specified, usually according to
Normal condition, or according to the normal condition proposed by manufacturer.
Elastomer polyurethane and crystalline polylactic acid melt blending, extrusion in following embodiments stretch preparation 3D printing consumption
The process of material is as shown in Figure 1, comprising:
(1) melt blending obtains PLA/TPU compound in double screw extruder after TPU is mixed with PLA；
(2) PLA/TPU compound is squeezed out in single screw extrusion machine and is obtained silk material (Filament), is i.e. 3D printing consumes
Material.
Embodiment 1
(1) elastomer polyurethane resin is taken to be put into 80 DEG C of vacuum drying oven dry 4h, the elastomer after being dried is poly-
Urethane resin, it is spare.
(2) it takes crystalline polylactic acid resin to be put into 80 DEG C of vacuum drying oven dry 8h, obtains the poly- cream of dry crystallinity
Acid resin, it is spare.
(3) raw material is weighed according to following mass percent: the elastomer polyurethane resin after the drying that step (1) obtains
10%, the crystalline polylactic acid resin 90% after the drying that step (2) obtains, the sum of the mass percent of two kinds of raw materials is
100%.
(4) the weighed raw material of step (3) is mixed and carries out melt blending granulation with twin-screw, obtained diameter is 1.3
~2.5mm, length be 5~7mm composite granule, be placed at 80 DEG C be dried in vacuo 12h it is spare, twin-screw revolving speed in extrusion process
Control is controlled in 160~180r/min, blending temperature at 170~200 DEG C.
(5) composite granule made from step (4) is squeezed out using single screw extrusion machine, control extrusion process screw rod speed
Degree is 8r/min, and extrusion temperature is controlled at 175~190 DEG C, and hauling speed is set as 9m/min, squeezes compound continuous uniform
Out, squeeze out that silk is cooling by three sections of sinks, and temperature is respectively 55 DEG C, 40 DEG C and 25 DEG C, by consumptive material diameter control 1.75 ±
0.03mm is collected through wrapping machine, and gained silk material is the 3D printing consumption of elastomer polyurethane and crystalline polylactic acid composite material
Material.
(6) by the 3D printing consumptive material of elastomer polyurethane fiber made from step (5) and crystalline polylactic acid composite material
It is printed by HUEWAY 3D-304FDM printer, with draw ratio for 27 processing machinery strength test standard samples.To print temperature
Degree is 205 DEG C, print speed 50mm/s, and printing angle is ± 45 ° of printing shaping samples.Elastomer polyurethane is poly- in crystallinity
Distribution pattern in lactic acid is as shown in Fig. 2, elastomer polyurethane is distributed in the base with threadiness, and is taken along Print direction
To.Printed sample impact property is tested through ISO14125 impact strength testing standard, data are listed in table 1.
Embodiment 2
(1) elastomer polyurethane resin is taken to be put into 80 DEG C of vacuum drying oven dry 4h, the elastomer after being dried is poly-
Urethane resin, it is spare.
(2) it takes crystalline polylactic acid resin to be put into 80 DEG C of vacuum drying oven dry 8h, obtains the poly- cream of dry crystallinity
Acid resin, it is spare.
(3) raw material is weighed according to following mass percent: the elastomer polyurethane resin after the drying that step (1) obtains
20%, the crystalline polylactic acid resin 80% after the drying that step (2) obtains, the sum of the mass percent of two kinds of raw materials is
100%.
(4) the weighed raw material of step (3) is mixed and carries out melt blending granulation with twin-screw, obtained diameter is 1.3
~2.5mm, length be 5~7mm composite granule, be placed at 80 DEG C be dried in vacuo 12h it is spare, twin-screw revolving speed in extrusion process
Control is controlled in 160~180r/min, blending temperature at 170~200 DEG C.
(5) composite granule made from step (4) is squeezed out using single screw extrusion machine, control extrusion process screw rod speed
Degree is 8r/min, and extrusion temperature is controlled at 175~190 DEG C, and hauling speed is set as 9m/min, squeezes compound continuous uniform
Out, squeeze out that silk is cooling by three sections of sinks, and temperature is respectively 55 DEG C, 40 DEG C and 25 DEG C, by consumptive material diameter control 1.75 ±
0.03mm is collected through wrapping machine, and gained silk material is the 3D printing consumption of elastomer polyurethane and crystalline polylactic acid composite material
Material.
(6) by the 3D printing consumptive material of elastomer polyurethane fiber made from step (5) and crystalline polylactic acid composite material
It is printed by HUEWAY 3D-304FDM printer, with draw ratio for 27 processing machinery strength test standard samples.To print temperature
Degree is 205 DEG C, print speed 50mm/s, and printing angle is ± 45 ° of printing shaping samples.It is tested through ISO14125 impact strength
Standard tests printed sample impact property, and data are listed in table 1.
Embodiment 3
(1) elastomer polyurethane resin is taken to be put into 80 DEG C of vacuum drying oven dry 4h, the elastomer after being dried is poly-
Urethane resin, it is spare.
(2) it takes crystalline polylactic acid resin to be put into 80 DEG C of vacuum drying oven dry 8h, obtains the poly- cream of dry crystallinity
Acid resin, it is spare.
(3) raw material is weighed according to following mass percent: the elastomer polyurethane resin after the drying that step (1) obtains
30%, the crystalline polylactic acid resin 70% after the drying that step (2) obtains, the sum of the mass percent of two kinds of raw materials is
100%.
(4) the weighed raw material of step (3) is mixed and carries out melt blending granulation with twin-screw, obtained diameter is 1.3
~2.5mm, length be 5~7mm composite granule, be placed at 80 DEG C be dried in vacuo 12h it is spare, twin-screw revolving speed in extrusion process
Control is controlled in 160~180r/min, blending temperature at 170~200 DEG C.
(5) composite granule made from step (4) is squeezed out using single screw extrusion machine, control extrusion process screw rod speed
Degree is 8r/min, and extrusion temperature is controlled at 175~190 DEG C, and hauling speed is set as 9m/min, squeezes compound continuous uniform
Out, squeeze out that silk is cooling by three sections of sinks, and temperature is respectively 55 DEG C, 40 DEG C and 25 DEG C, by consumptive material diameter control 1.75 ±
0.03mm is collected through wrapping machine, and gained silk material is the 3D printing consumption of elastomer polyurethane and crystalline polylactic acid composite material
Material.
(6) by the 3D printing consumptive material of elastomer polyurethane fiber made from step (5) and crystalline polylactic acid composite material
It is printed by HUEWAY 3D-304FDM printer, with draw ratio for 27 processing machinery strength test standard samples.To print temperature
Degree is 205 DEG C, print speed 50mm/s, and printing angle is ± 45 ° of printing shaping samples.It is tested through ISO14125 impact strength
Standard tests printed sample impact property, and data are listed in table 1.
Comparative example 1
(1) elastomer polyurethane resin is taken to be put into 80 DEG C of vacuum drying oven dry 4h, the elastomer after being dried is poly-
Urethane resin, it is spare.
(2) it takes crystalline polylactic acid resin to be put into 80 DEG C of vacuum drying oven dry 8h, obtains the poly- cream of dry crystallinity
Acid resin, it is spare.
(3) raw material is weighed according to following mass percent: the elastomer polyurethane resin after the drying that step (1) obtains
10%, the crystalline polylactic acid resin 90% after the drying that step (2) obtains, the sum of the mass percent of two kinds of raw materials is
100%.
(4) the weighed raw material of step (3) is mixed and carries out melt blending granulation with twin-screw, obtained diameter is 1.3
~2.5mm, length be 5~7mm composite granule, be placed at 80 DEG C be dried in vacuo 12h it is spare, twin-screw revolving speed in extrusion process
Control is controlled in 160~180r/min, blending temperature at 170~200 DEG C.
(5) composite granule made from step (4) is squeezed out using single screw extrusion machine, control extrusion process screw rod speed
Degree is 8r/min, and extrusion temperature is controlled at 175~190 DEG C, and hauling speed is set as 9m/min, squeezes compound continuous uniform
Out, squeeze out that silk is cooling by three sections of sinks, and temperature is respectively 55 DEG C, 40 DEG C and 25 DEG C, by consumptive material diameter control 1.75 ±
0.03mm is collected through wrapping machine, and gained silk material is the 3D printing consumption of elastomer polyurethane and crystalline polylactic acid composite material
Material.
(6) the 3D printing consumptive material for obtaining step (5) is granulated by pelleter, revolving speed 30r/min.Use injection molding machine pair
Composite granule obtained is molded, and control injection temperature is 190 DEG C, and injection pressure is set as 15MPa, and mold temperature control exists
55 DEG C, the dwell time is set as 10s, preparation gained polylactic acid/elastomer polyurethane composite material standard impact specimen.Elastomer
Distribution pattern of the polyurethane in crystalline polylactic acid is as shown in figure 3, elastomer polyurethane is distributed in matrix with spherical structure.
Injection-molded test specimens impact property is tested through ISO14125 impact strength testing standard, data are listed in table 1.
Comparative example 2
(1) elastomer polyurethane resin is taken to be put into 80 DEG C of vacuum drying oven dry 4h, the elastomer after being dried is poly-
Urethane resin, it is spare.
(2) it takes crystalline polylactic acid resin to be put into 80 DEG C of vacuum drying oven dry 8h, obtains the poly- cream of dry crystallinity
Acid resin, it is spare.
(3) raw material is weighed according to following mass percent: the elastomer polyurethane resin after the drying that step (1) obtains
20%, the crystalline polylactic acid resin 80% after the drying that step (2) obtains, the sum of the mass percent of two kinds of raw materials is
100%.
(4) the weighed raw material of step (3) is mixed and carries out melt blending granulation with twin-screw, obtained diameter is 1.3
~2.5mm, length be 5~7mm composite granule, be placed at 80 DEG C be dried in vacuo 12h it is spare, twin-screw revolving speed in extrusion process
Control is controlled in 160~180r/min, blending temperature at 170~200 DEG C.
(5) composite granule made from step (4) is squeezed out using single screw extrusion machine, control extrusion process screw rod speed
Degree is 8r/min, and extrusion temperature is controlled at 175~190 DEG C, and hauling speed is set as 9m/min, squeezes compound continuous uniform
Out, squeeze out that silk is cooling by three sections of sinks, and temperature is respectively 55 DEG C, 40 DEG C and 25 DEG C, by consumptive material diameter control 1.75 ±
0.03mm is collected through wrapping machine, and gained silk material is the 3D printing consumption of elastomer polyurethane and crystalline polylactic acid composite material
Material.
(6) the 3D printing consumptive material for obtaining step (5) is granulated by pelleter, revolving speed 30r/min.Use injection molding machine pair
Composite granule obtained is molded, and control injection temperature is 190 DEG C, and injection pressure is set as 15MPa, and mold temperature control exists
55 DEG C, the dwell time is set as 10s, preparation gained polylactic acid/elastomer polyurethane composite material standard impact specimen.Through
ISO14125 impact strength testing standard tests injection-molded test specimens impact property, and data are listed in table 1.
Comparative example 3
(1) elastomer polyurethane resin is taken to be put into 80 DEG C of vacuum drying oven dry 4h, the elastomer after being dried is poly-
Urethane resin, it is spare.
(2) it takes crystalline polylactic acid resin to be put into 80 DEG C of vacuum drying oven dry 8h, obtains the poly- cream of dry crystallinity
Acid resin, it is spare.
(3) raw material is weighed according to following mass percent: the elastomer polyurethane resin after the drying that step (1) obtains
30%, the crystalline polylactic acid resin 70% after the drying that step (2) obtains, the sum of the mass percent of two kinds of raw materials is
100%.
(4) the weighed raw material of step (3) is mixed and carries out melt blending granulation with twin-screw, obtained diameter is 1.3
~2.5mm, length be 5~7mm composite granule, be placed at 80 DEG C be dried in vacuo 12h it is spare, twin-screw revolving speed in extrusion process
Control is controlled in 160~180r/min, blending temperature at 170~200 DEG C.
(5) composite granule made from step (4) is squeezed out using single screw extrusion machine, control extrusion process screw rod speed
Degree is 8r/min, and extrusion temperature is controlled at 175~190 DEG C, and hauling speed is set as 9m/min, squeezes compound continuous uniform
Out, squeeze out that silk is cooling by three sections of sinks, and temperature is respectively 55 DEG C, 40 DEG C and 25 DEG C, by consumptive material diameter control 1.75 ±
0.03mm is collected through wrapping machine, and gained silk material is the 3D printing consumption of elastomer polyurethane and crystalline polylactic acid composite material
Material.
(6) the 3D printing consumptive material for obtaining step (5) is granulated by pelleter, revolving speed 30r/min.Use injection molding machine pair
Composite granule obtained is molded, and control injection temperature is 190 DEG C, and injection pressure is set as 15MPa, and mold temperature control exists
55 DEG C, the dwell time is set as 10s, preparation gained polylactic acid/elastomer polyurethane composite material standard impact specimen.Through
ISO14125 impact strength testing standard tests injection-molded test specimens impact property, and data are listed in table 1.
1 impact strength test data of table
| Number | Impact strength (J/m) |
| Embodiment 1 | 31.2 |
| Embodiment 2 | 73.8 |
| Embodiment 3 | 90.3 |
| Comparative example 1 | 23.5 |
| Comparative example 2 | 59.1 |
| Comparative example 3 | 76.9 |
As known from Table 1, elastomer polyurethane staple fiber effectively raises the shock resistance of crystalline polylactic acid composite material
Intensity.
In addition, it should also be understood that, those skilled in the art can be to this hair after having read foregoing description content of the invention
Bright to make various changes or modifications, these equivalent forms also fall within the scope of the appended claims of the present application.
Claims (10)
1. a kind of preparation method of the short fiber toughened crystalline polymer product of elastomer, comprising:
(1) by thermoplastic elastomer (TPE) and crystalline resin raw material, 10%~30%:70%~90% is mixed by mass percentage
It closes, is granulated by double screw extruder melt blending, obtain that pellet is blended after dry；The melting temperature of the thermoplastic elastomer (TPE)
10~20 DEG C are differed with the melting temperature of crystalline resin raw material；
(2) by obtained blending pellet be added single screw extrusion machine carry out melting extrusion, extruded stock by for the first time stretch and it is cold
But it handles, obtains 3D printing silk material；
(3) obtained 3D printing silk material is placed in fusion sediment moulding 3D printer, melt passes through second in print procedure
Secondary stretching and third time stretch, and superposition forms three-dimensional structure on shaped platform, and cooling obtains the short fiber toughened knot of elastomer
Crystalline substance polymeric articles.
2. the preparation method of the short fiber toughened crystalline polymer product of elastomer according to claim 1, feature exist
In the melting temperature of the thermoplastic elastomer (TPE) is 150~190 DEG C, and the melting temperature of the crystalline resin raw material is
160~210 DEG C.
3. the preparation method of the short fiber toughened crystalline polymer product of elastomer according to claim 1 or 2, feature
It is, the thermoplastic elastomer (TPE) is thermoplastic polyurethane, and the crystalline resin raw material is polylactic acid.
4. the preparation method of the short fiber toughened crystalline polymer product of elastomer according to claim 1, feature exist
In the twin-screw revolving speed that the double screw extruder melt blending is granulated is 160~180r/min, and blending temperature control is 170
~200 DEG C.
5. the preparation method of the short fiber toughened crystalline polymer product of elastomer according to claim 1, feature exist
In, in step (2), the cooling treatment is three sections of sink cooling treatments, and first segment sink cooling water temperature is at least 55 DEG C,
Second segment sink cooling water temperature is 40~50 DEG C, and third section sink cooling water temperature is room temperature.
6. the preparation method of the short fiber toughened crystalline polymer product of elastomer according to claim 1, feature exist
In in step (2), the screw speed when single screw extrusion machine carries out melting extrusion is 6~10r/min, and extrusion temperature is
175~190 DEG C.
7. the preparation method of the short fiber toughened crystalline polymer product of elastomer according to claim 1, feature exist
In the draw ratio that the single screw extrusion machine carries out melting extrusion is at least 4.28.
8. the preparation method of the short fiber toughened crystalline polymer product of elastomer according to claim 1, feature exist
In in step (3), the melting extrusion draw ratio of the fusion sediment moulding 3D printer is 25~30.
9. the preparation method of the short fiber toughened crystalline polymer product of elastomer according to claim 1, described is molten
Melt Deposition Modeling 3D printer print temperature be 180~230 DEG C, print speed be 20~70mm/s, printing angle be 20~
80°。
10. the elastomer staple fiber that preparation method described in a kind of any claim according to claim 1~9 is prepared increases
Tough crystalline polymer product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910344663.8A CN110054878B (en) | 2019-04-26 | 2019-04-26 | Elastomer short fiber toughened crystalline polymer product and preparation method thereof |
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| CN111808408A (en) * | 2020-08-06 | 2020-10-23 | 苏州环诺新材料科技有限公司 | Photosensitive antibacterial biodegradable 3D printing wire and preparation method thereof |
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