CN109485851A - A kind of preparation method and applications of 3D printing photocurable polyimide ink - Google Patents
A kind of preparation method and applications of 3D printing photocurable polyimide ink Download PDFInfo
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- CN109485851A CN109485851A CN201811315172.2A CN201811315172A CN109485851A CN 109485851 A CN109485851 A CN 109485851A CN 201811315172 A CN201811315172 A CN 201811315172A CN 109485851 A CN109485851 A CN 109485851A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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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
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/04—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polycarbonamides, polyesteramides or polyimides
- C08F283/045—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polycarbonamides, polyesteramides or polyimides on to unsaturated polycarbonamides, polyesteramides or polyimides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1003—Preparatory processes
- C08G73/1007—Preparatory processes from tetracarboxylic acids or derivatives and diamines
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
- C08G73/1071—Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2351/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2351/08—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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Abstract
The present invention relates to a kind of 3D printing preparation methods of photocurable polyimide ink, method includes the following steps: (1) 3, n-methyl-2-pyrrolidone, 4 are successively added in 5- diaminobenzoic acid, 4'-(4,4'- isopropyl diphenoxy) two anhydride phthalic acids, 4,4' benzidine ether, up to copolyimide after imidization；(2) prepare the polyimides of methacrylate grafting: in copolyimide product plus n-methyl-2-pyrrolidone obtains solution A；Methylate senecioate-hydroxyl ethyl ester, N, N'- Dicyclohexylcarbodiimide and 4- dimethylamino pyridine, obtain solution B in n-methyl-2-pyrrolidone；Solution A and B after Steglich esterification to obtain the final product；(3) acrylic ester grafted polyimides is dissolved into n-vinyl-2-pyrrolidone, sequentially adds isobornyl methacrylate, hydroquinone, Irgacure 2100 up to photocurable polyimide ink.The invention also discloses the applications of the ink.The method of the present invention is simple, and resulting ink has shape-memory properties and can be rapid photocuring.
Description
Technical field
The present invention relates to 3D printing field more particularly to a kind of preparation methods of 3D printing photocurable polyimide ink
And its application.
Background technique
Shape-memory material (shape memory materials, SMMs) can change itself according to environmental stimuli
Shape, be a kind of typical intellectual material, shape-memory material includes shape memory ceramics, shape memory metal and shape
Memory polymer etc., wherein shape-memory polymer (shape memory polymers, SMPs) is one kind with macromolecular chain
Conformation transition based on shape-memory material, can under the action of certain environmental stimuli spontaneously from temporary shapes change
For permanent shape, crystallization/melting transition (or glass transition) as can the response that is stimulated of anti-phase, and cross-linked network is made
Restoring force is provided for stationary phase, has the characteristics that deformation recovery rate is big, shape memory effect is significant, stimulating responsive is good.
Zero dimension, a peacekeeping two-dimensional structure is presented in the shape-memory polymer studied at present mostly, these simple structures exist
It is greatly limited in the practical application of shape-memory polymer, so in order to meet shape-memory polymer in special device
Demand in part further widens the application range of shape-memory polymer, and it is poly- to construct shape memory using 3D printing technique
It is necessary for closing the three-D space structure of object complexity.
3D printing technique (3D printing), which is called, does increasing material manufacturing (Additive Manufacturing, AM), is
It, can for a kind of multi-functional technology platform that CAD (Computer-Assisted Design, CAD) occurs
The dummy model designed in CAD to be quickly completely changed into the three-dimensional structure of reality in no mold.3D printing is normal
It is often used as Mold Making and rapid shaping, because the characteristics of its fast and easy is widely used in medical treatment, building, the energy, food
The industries such as product processing.
Polyimide-based shape-memory material, due to high mechanical strength, high modulus, low thermal expansion coefficient
It is widely studied with the advantages that excellent thermal stability, and the 3D printing of Thermocurable polyimide material is exactly faced difficulty
One of topic, the product after printing not only will appear dimensional contraction in post-processing, reduce the fidelity of printed product, but also meeting
Lose the original high-strength high-temperature behavior of polyimides.Therefore, it can be realized the 3D printing for having property polyimide material
Shape memory field and 3D printing field are all had far-reaching significance.And it is there is no at present about with shape-memory properties
The report of 3D printing polyimides ink.
Summary of the invention
A kind of technical problem to be solved by the invention is to provide methods 3D printing light-solidifying poly simple, easy to implement
The preparation method of acid imide ink.
Another technical problem to be solved by this invention is to provide answering for the 3D printing photocurable polyimide ink
With.
To solve the above problems, a kind of preparation method of 3D printing photocurable polyimide ink of the present invention,
The following steps are included:
(1) copolyimide is prepared:
Under nitrogen atmosphere, n-methyl-2-pyrrolidone is added in 3,5- diaminobenzoic acid and stirs to 3, the 5- diamino
Yl benzoic acid is completely dissolved；It is slow added into 4,4'-(4,4'- isopropyl diphenoxy) two anhydride phthalic acids, are persistently stirred in ice bath
20 ~ 30h is mixed, mixed liquor is obtained, 4,4' benzidine ether is added in the mixed liquor and continues 20 ~ 30 h of stirring, obtains black
Polyamic acid solution；The black polyamic acid solution is heated to 240 ~ 290 DEG C and stirs 2 ~ 5 h progress imidization, obtains
To dark thick shape copolyimide solution, the copolyimide solution is through precipitating, cleaning, drying to get copolymerization polyamides
Imine product；The total moles of the 3,5-diaminobenzoic acid and the 4,4' benzidine ether and the 4,4'-(4,4'-
Isopropyl diphenoxy) two anhydride phthalic acids molar ratio be 1:1；3,5-the diaminobenzoic acid and the 4,4' benzidine
The ratio of the mole of ether is 1:1；
(2) the polyimides of methacrylate grafting is prepared:
At room temperature, n-methyl-2-pyrrolidone is added in the copolyimide product to be stirred continuously after being completely dissolved,
Obtain solution A；Methacrylic acid-beta-hydroxy ethyl ester, N, N'- dicyclohexyl phosphinylidyne are sequentially added in n-methyl-2-pyrrolidone
Imines and 4- dimethylamino pyridine are simultaneously stirred until solid disappearance, obtain solution B；Then the solution A is mixed with the solution B
It stands at room temperature afterwards and Steglich esterification occurs, precipitated until generating；Filtrate is obtained after filtering, which is precipitated, is clear
It washes, dry the polyimides being grafted to get methacrylate；Methacrylic acid-the beta-hydroxy ethyl ester, the N, bis- ring of N'-
The molar ratio of hexyl carbimide and the 4- dimethylamino pyridine is 10:10:1；Methacrylic acid-the beta-hydroxy ethyl ester and institute
The mole for stating 3,5-diaminobenzoic acids is equal；
(3) photocurable polyimide ink is prepared:
The acrylic ester grafted polyimides is dissolved into n-vinyl-2-pyrrolidone, crosslinking is then sequentially added
Monomer methacrylic acid isobornyl thiocyanoacetate, hydroquinone of polymerization retarder, photoinitiator Irgacure 2100 simultaneously stir 10 ~ 25min, i.e.,
Obtain the shape memory polyimides ink of 3D printing；The additional amount of the isobornyl methacrylate is the shape of the 3D printing
Shape remembers 0 ~ 16wt% of polyimides ink, and the additional amount of the n-vinyl-2-pyrrolidone is the shape of the 3D printing
Remember 62 ~ 70wt% of polyimides ink, the additional amount of the hydroquinone is the shape memory polyimides of the 3D printing
The 0.1wt% of ink, 2100 additional amount of Irgacure are the shape memory polyimides ink of the 3D printing
1.9wt%。
The shape note of 3D printing obtained by a kind of preparation method of 3D printing photocurable polyimide ink as described above
Recall the application of polyimides ink, it is characterised in that: the shape memory polyimides ink of the 3D printing is poured on glass substrate
On, the substrate is put into UV ultra-violet curing case after room temperature vacuumizes 0.5 h of degassing, it is to be solidified completely after obtain polyimides
Film；Kapton elder generation room temperature to 120 DEG C, heat preservation 1 h, then be warming up to 160 DEG C, heat preservation 2 h to get light friendship
The shape memory Kapton of connection.
The shape note of 3D printing obtained by a kind of preparation method of 3D printing photocurable polyimide ink as described above
Recall the application of polyimides ink, it is characterised in that: the shape memory polyimides ink of the 3D printing is poured into DLP type 3D and is beaten
In print machine, the shape memory polyimides of three kinds of different structures is printed, and obtained product is put into UV ultra-violet curing case,
Solidified under conditions of curing time is 30s, the monolayer immobilization time is 50 μm, finally in 160 DEG C of heat preservation 2h to get 3D printing
Shape memory polyimides.
The ultraviolet light wave a length of 420nm, power 200W of the UV ultra-violet curing case.
Compared with the prior art, the present invention has the following advantages:
1, the present invention is first using 3,5-diaminobenzoic acids, 4,4' benzidine ether as two kinds of same 4,4'-(4,4'- of diamines
Isopropyl diphenoxy) two anhydride phthalic acids formation linear copolymer, the carboxyl conduct that then will be introduced on 3,5-diaminobenzoic acids
Active site grafted methacrylic acid-beta-hydroxy ethyl ester, the reaction are the first being grafted by simple Steglich esterification
Base acrylate group can be with n-vinyl-2-pyrrolidone, cross-linking monomer isobornyl methacrylate in photoinitiator
Irgacure 2100 acts on the free radical polymerization for issuing third contact of a total solar or lunar eclipse initiation, to form photo-crosslinking solid network.Due to its quick light
Curing characteristics, therefore the ink is used for stereolithography class 3D printing technique (such as DLP, SLA), hydroquinone of polymerization retarder energy is added
The photocuring precision of ink is enough improved, then the building to complex model is completed by layer upon layer.
2, after-contraction can be ignored the polyimide material printed in the present invention substantially after post treatment, good in addition to having
Mechanical strength outside, superior shape-memory properties (shape fixed rate R is also presentedf> 99%, response rate Rr> 98%) inside,
Photo-crosslinking network provides the driving force of reply as stationary phase, and the glass transition (T of polyimides segmentg=140~160
DEG C) as can anti-phase, be able to respond environmental stimuli, macroshape enable spontaneously to be changed into original-shape from temporary shapes.
Shape-memory properties are carried out to shape memory Kapton prepared by embodiment 1 using dynamic mechanical analyzer
Characterization, as a result as shown in Figure 2.Fig. 2 shows that the shape memory Kapton of preparation has good memory cycle
It can be with higher shape fixed rate and response rate (Rf> 99%, Rr> 98%).
3, the glass transition temperature of the obtained ink of the present invention is 160 DEG C, be can be applicable to compared with high transition temperature shape
The preparation of memory polymer.
Glass transition temperature is carried out to shape memory Kapton prepared by embodiment 1 using dynamic mechanical analyzer
Degree test, as shown in Figure 1, it can be seen that glass transition temperature is 160 DEG C.
4, the obtained ink of the present invention has good shape-memory properties, mechanical performance after photocuring 3D printing
And thermal stability, it can be applied to the fields such as the rapid shaping of temperature sensor, encapsulation technology and complicated shape memory material.
5, the obtained ink of the present invention has rapid photocuring, while having both shape-memory properties, passes through 3D printing structure
After building out complicated three-dimensional structure, 4D printing can also be completed using the shape memory effect of printed product and (increase time dimension
Degree), in other words: the material of printing be not it is static, shape can be changed according to the variation of external environment.It is this novel
3D printing can be widened further with shape memory polyimides ink and be led in shape memory, 3D printing and microelectronic sensor
The application in domain.
6, the method for the present invention is simple, easy to implement.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 is the thermomechanical property curve of shape memory film prepared by the embodiment of the present invention 1.
Fig. 2 is the shape-memory properties curve of shape memory film prepared by the embodiment of the present invention 1.
Fig. 3 is the 3D printing of shape memory polyimides ink prepared by the embodiment of the present invention 1.
Fig. 4 is the shape-memory properties of 3D printing shape memory polyimide prepared by the embodiment of the present invention 1.
Specific embodiment
A kind of preparation method of 1 3D printing photocurable polyimide ink of embodiment, comprising the following steps:
(1) copolyimide is prepared:
Under nitrogen atmosphere, n-methyl-2-pyrrolidone (28mL) is added in 3,5- diaminobenzoic acid (5mmol, 0.746g)
And it stirs to 3,5- diaminobenzoic acid and is completely dissolved；It is slow added into 4,4'-(4,4'- isopropyl diphenoxy) two anhydride phthalic acids
(10mmol, 5.2g), persistently stirs 20 ~ 30h in ice bath, obtains mixed liquor, and 4,4' benzidine is added in the mixed liquor
Ether (5mmol, 1.001g) simultaneously continues 20 ~ 30 h of stirring, obtains black polyamic acid solution；Black polyamic acid solution is heated to
240 ~ 290 DEG C and 2 ~ 5 h of stirring carry out imidization, remove the hydrone generated using water segregator in this process, most
Dark thick shape copolyimide solution is obtained eventually, which precipitates through dehydrated alcohol, deionized water is anti-
Multiple cleaning, drying are to get copolyimide product.
(2) the polyimides of methacrylate grafting is prepared:
At room temperature, n-methyl-2-pyrrolidone is added in copolyimide product to be stirred continuously after being completely dissolved, obtains
Solution A；Methacrylic acid-beta-hydroxy ethyl ester (5.1mmol, 0.663g), N, N'- are sequentially added in n-methyl-2-pyrrolidone
Dicyclohexylcarbodiimide (5.1mmol, 1.052g) and 4- dimethylamino pyridine (0.51mmol, 0.062g) are simultaneously stirred until solid
Body disappears, and obtains solution B；Then 1 day generation Steglich esterification is stood after solution A is mixed with solution B at room temperature, until
Generate precipitating；Filtrate is obtained after filtering, which, which is poured slowly into dehydrated alcohol to be precipitated, keeps acrylic ester grafted polyamides sub-
Amine aqueous solution precipitates, deionized water is cleaned repeatedly, the dry polyimides being grafted to get methacrylate.
(3) photocurable polyimide ink is prepared:
Acrylic ester grafted polyimides (20wt%) is dissolved into n-vinyl-2-pyrrolidone (70wt%), then according to
Secondary addition cross-linking monomer isobornyl methacrylate (8wt%), hydroquinone of polymerization retarder (0.1wt%), photoinitiator
Irgacure 2100(1.9wt%) and 20min is stirred to get the shape memory polyimides ink of 3D printing.
A kind of preparation method of 2 3D printing photocurable polyimide ink of embodiment, comprising the following steps:
(1) copolyimide is prepared with embodiment 1.
(2) the polyimides of methacrylate grafting is prepared with embodiment 1.
(3) photocurable polyimide ink is prepared:
Acrylic ester grafted polyimides (20wt%) is dissolved into n-vinyl-2-pyrrolidone (78wt%), then according to
Secondary addition hydroquinone of polymerization retarder (0.1wt%), photoinitiator Irgacure 2100(1.9wt%) and 10min is stirred to get 3D
The shape memory polyimides ink of printing.
A kind of preparation method of 3 3D printing photocurable polyimide ink of embodiment, comprising the following steps:
(1) copolyimide is prepared with embodiment 1.
(2) the polyimides of methacrylate grafting is prepared with embodiment 1.
(3) photocurable polyimide ink is prepared:
Acrylic ester grafted polyimides (20wt%) is dissolved into n-vinyl-2-pyrrolidone (74wt%), then according to
Secondary addition cross-linking monomer isobornyl methacrylate (4wt%), hydroquinone of polymerization retarder (0.1wt%), photoinitiator
Irgacure 2100(1.9wt%) and 25min is stirred to get the shape memory polyimides ink of 3D printing.
A kind of preparation method of 4 3D printing photocurable polyimide ink of embodiment, comprising the following steps:
(1) copolyimide is prepared with embodiment 1.
(2) the polyimides of methacrylate grafting is prepared with embodiment 1.
(3) photocurable polyimide ink is prepared:
Acrylic ester grafted polyimides (20wt%) is dissolved into n-vinyl-2-pyrrolidone (66wt%), then according to
Secondary addition cross-linking monomer isobornyl methacrylate (12wt%), hydroquinone of polymerization retarder (0.1wt%), photoinitiator
Irgacure 2100(1.9wt%) and 20min is stirred to get the shape memory polyimides ink of 3D printing.
A kind of preparation method of 5 3D printing photocurable polyimide ink of embodiment, comprising the following steps:
(1) copolyimide is prepared with embodiment 1.
(2) the polyimides of methacrylate grafting is prepared with embodiment 1.
(3) photocurable polyimide ink is prepared:
Acrylic ester grafted polyimides (20wt%) is dissolved into n-vinyl-2-pyrrolidone (62wt%), then according to
Secondary addition cross-linking monomer isobornyl methacrylate (16wt%), hydroquinone of polymerization retarder (0.1wt%), photoinitiator
Irgacure 2100(1.9wt%) and 20min is stirred to get the shape memory polyimides ink of 3D printing.
The application of the shape memory polyimides ink of the gained 3D printing of above-described embodiment 1 ~ 5 refers to: by the 3D printing
Shape memory polyimides ink on the glass substrate, through room temperature vacuumize degassing 0.5 h after by the substrate be put into UV purple
In outer solidification case, it is to be solidified completely after with the blade with a thickness of 300 μm gently wipe off on glass substrate to obtain polyimides thin
Film；Kapton elder generation room temperature to 120 DEG C, 1 h of heat preservation, then be warming up to 160 DEG C, 2 h of heat preservation to be to remove remaining small point
Son to get photo-crosslinking shape memory Kapton.
Or the application of the shape memory polyimides ink of the gained 3D printing of above-described embodiment 1 ~ 5 refers to: the 3D is beaten
The shape memory polyimides ink of print pours into DLP type 3D printer, and the shape memory polyamides for printing three kinds of different structures is sub-
Amine, and obtained product is put into UV ultra-violet curing case, in the condition that curing time is 30s, the monolayer immobilization time is 50 μm
Under solidified, finally in 160 DEG C of heat preservation 2h, remove small molecule to get the shape memory polyimides of 3D printing.
Wherein: the ultraviolet light wave a length of 420nm, power 200W of UV ultra-violet curing case.
The shape memory polyimides of three kinds of different structures is had printed using DLP type 3D printer, as a result as shown in Figure 3.
Fig. 3 shows that the shape memory polyimide of printing has very high fidelity and precision.It is recorded using Nikon D7200
The macroshape memory performances of these three different structure products, as a result as shown in figure 4, Fig. 4 is shown, printed product has three-dimensional
Good shape-memory properties on direction.
Claims (4)
1. a kind of 3D printing preparation method of photocurable polyimide ink, comprising the following steps:
(1) copolyimide is prepared:
Under nitrogen atmosphere, n-methyl-2-pyrrolidone is added in 3,5- diaminobenzoic acid and stirs to 3, the 5- diamino
Yl benzoic acid is completely dissolved；It is slow added into 4,4'-(4,4'- isopropyl diphenoxy) two anhydride phthalic acids, are persistently stirred in ice bath
20 ~ 30h is mixed, mixed liquor is obtained, 4,4' benzidine ether is added in the mixed liquor and continues 20 ~ 30 h of stirring, obtains black
Polyamic acid solution；The black polyamic acid solution is heated to 240 ~ 290 DEG C and stirs 2 ~ 5 h progress imidization, obtains
To dark thick shape copolyimide solution, the copolyimide solution is through precipitating, cleaning, drying to get copolymerization polyamides
Imine product；The total moles of the 3,5-diaminobenzoic acid and the 4,4' benzidine ether and the 4,4'-(4,4'-
Isopropyl diphenoxy) two anhydride phthalic acids molar ratio be 1:1；3,5-the diaminobenzoic acid and the 4,4' benzidine
The ratio of the mole of ether is 1:1；
(2) the polyimides of methacrylate grafting is prepared:
At room temperature, n-methyl-2-pyrrolidone is added in the copolyimide product to be stirred continuously after being completely dissolved,
Obtain solution A；Methacrylic acid-beta-hydroxy ethyl ester, N, N'- dicyclohexyl phosphinylidyne are sequentially added in n-methyl-2-pyrrolidone
Imines and 4- dimethylamino pyridine are simultaneously stirred until solid disappearance, obtain solution B；Then the solution A is mixed with the solution B
It stands at room temperature afterwards and Steglich esterification occurs, precipitated until generating；Filtrate is obtained after filtering, which is precipitated, is clear
It washes, dry the polyimides being grafted to get methacrylate；Methacrylic acid-the beta-hydroxy ethyl ester, the N, bis- ring of N'-
The molar ratio of hexyl carbimide and the 4- dimethylamino pyridine is 10:10:1；Methacrylic acid-the beta-hydroxy ethyl ester and institute
The mole for stating 3,5-diaminobenzoic acids is equal；
(3) photocurable polyimide ink is prepared:
The acrylic ester grafted polyimides is dissolved into n-vinyl-2-pyrrolidone, crosslinking is then sequentially added
Monomer methacrylic acid isobornyl thiocyanoacetate, hydroquinone of polymerization retarder, photoinitiator Irgacure 2100 simultaneously stir 10 ~ 25min, i.e.,
Obtain the shape memory polyimides ink of 3D printing；The additional amount of the isobornyl methacrylate is the shape of the 3D printing
Shape remembers 0 ~ 16wt% of polyimides ink, and the additional amount of the n-vinyl-2-pyrrolidone is the shape of the 3D printing
Remember 62 ~ 70wt% of polyimides ink, the additional amount of the hydroquinone is the shape memory polyimides of the 3D printing
The 0.1wt% of ink, 2100 additional amount of Irgacure are the shape memory polyimides ink of the 3D printing
1.9wt%。
2. the shape of 3D printing obtained by a kind of preparation method of 3D printing photocurable polyimide ink as described in claim 1
The application of shape memory polyimides ink, it is characterised in that: the shape memory polyimides ink of the 3D printing is poured on glass
On substrate, the substrate is put into UV ultra-violet curing case after room temperature vacuumizes 0.5 h of degassing, it is to be solidified completely after obtain polyamides
Imines film；Kapton elder generation room temperature to 120 DEG C, heat preservation 1 h, then be warming up to 160 DEG C, heat preservation 2 h to get
The shape memory Kapton of photo-crosslinking.
3. the shape of 3D printing obtained by a kind of preparation method of 3D printing photocurable polyimide ink as described in claim 1
The application of shape memory polyimides ink, it is characterised in that: the shape memory polyimides ink of the 3D printing is poured into DLP type
In 3D printer, the shape memory polyimides of three kinds of different structures is printed, and obtained product is put into UV ultra-violet curing case
In, solidified under conditions of curing time is 30s, the monolayer immobilization time is 50 μm, finally in 160 DEG C of heat preservation 2h to get
The shape memory polyimides of 3D printing.
4. 3D printing obtained by a kind of preparation method of 3D printing photocurable polyimide ink as claimed in claim 2 or claim 3
Shape memory polyimides ink application, it is characterised in that: a length of 420nm of ultraviolet light wave of the UV ultra-violet curing case,
Power is 200W.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111019068A (en) * | 2019-12-25 | 2020-04-17 | 中国科学院兰州化学物理研究所 | Polyimide photosensitive resin with extrudable shape memory performance and preparation and application thereof |
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