CN117645788A - Preparation method of photo-curing flexible resin material with magnetism - Google Patents

Preparation method of photo-curing flexible resin material with magnetism Download PDF

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Publication number
CN117645788A
CN117645788A CN202311620537.3A CN202311620537A CN117645788A CN 117645788 A CN117645788 A CN 117645788A CN 202311620537 A CN202311620537 A CN 202311620537A CN 117645788 A CN117645788 A CN 117645788A
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resin
curing
photo
magnetic
flexible
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CN202311620537.3A
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Inventor
牛小东
李湘帆
贺天沛
刘润铎
张永超
王娅萍
王智慧
李嘉晴
曾康扬
温明富
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Shantou University
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Shantou University
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Abstract

The invention belongs to the technical field of resin materials, and particularly relates to a preparation method of a photo-curing flexible resin material with magnetism, which comprises the following steps: s1, preparing resin: the method specifically comprises the following steps: s101, prefabricating raw materials: a fixed amount of flexible photosensitive resin was poured into a large beaker, 0.2wt% of a resin thickener was added, and stirred with a tetrafluoro rod for 5 minutes, and the mixture was uniformly mixed as a resin raw material. According to the invention, oleic acid and Tween-twenty are added as the surfactant of the iron oxide magnetic particles in the process of preparing the magnetic fluid by using a chemical coprecipitation method, so that the iron oxide magnetic particles can be uniformly and stably dispersed in the ferrofluid. In the mixing process of the ferrofluid and the resin, the agglomeration and sedimentation phenomena of the iron oxide magnetic particles in the resin are greatly reduced by adding the thickener, so that the proportion of the iron oxide magnetic particles added into the superparamagnetic soft material is increased, and larger magnetism is generated.

Description

Preparation method of photo-curing flexible resin material with magnetism
Technical Field
The invention belongs to the technical field of resin materials, and particularly relates to a preparation method of a photo-curing flexible resin material with magnetism.
Background
4D printing is a field derived from 3D printing developed in recent years, and has wide application prospect. Although similar to 3D printing, 4D printing techniques involve a fourth dimension of time in addition to three-dimensional spatial coordinates. 4D printing is considered to be the ability to impart to a printed structure a change in its color, shape, function or other characteristic over time under external stimuli such as temperature, solution, ultraviolet light or magnetic energy, and is applicable to flexible electronics technology. The flexible electronic and soft robots have the characteristics of flexibility, stretchability and the like, and have huge potential application in the fields of biomedical equipment, aerospace and the like. The magnetic nano material is introduced into the flexible electronic and soft robot to widen the sensing and control modes.
Magnetic composites (i.e. a mixture of polymer matrix and magnetic particles) are mainly divided into three types from a practical point of view: hard magnetic materials, soft magnetic materials, and superparamagnetic materials. In superparamagnetic materials, nanoparticles are magnetically induced by a magnetic field, and demagnetize rapidly when the magnetic field is removed. The characteristics of no hysteresis and no coercive force lead the magnetic core to have higher practicability in the fields of biomedicine, aerospace and the like. For the current superparamagnetic composite materials, iron oxide is mainly added into a matrix to serve as superparamagnetic nano particles, and the particles usually need surface modification to improve the dispersibility of the particles in a resin matrix, otherwise, agglomeration phenomenon occurs. The magnetic fluid is a stable and functional colloid solution formed by coating or modifying magnetic nano particles with a surfactant and then dispersing the magnetic nano particles into a carrier liquid in a highly uniform manner.
However, the surfactant on the surface of the magnetic fluid magnetic particles still has agglomeration sedimentation phenomenon after a period of time after the resin is mixed. The addition of the thickener thus enables the particle dispersion in the formulated mixed photocurable resin to be maintained for a longer period of time. Since the magnetic fluid has both liquid fluidity and solid magnetism. Combining the magnetic fluid with the flexible resin material to produce the soft material with super paramagnetic property. For this purpose, we propose a method for preparing a photo-curable flexible resin material with magnetic properties.
Disclosure of Invention
The invention aims to provide a preparation method of a photo-curing flexible resin material with magnetism, which can improve the proportion of adding iron oxide magnetic particles into a superparamagnetic soft material through the actions of oleic acid, tween and an added thickener in a ferrofluid, thereby generating larger magnetism.
The technical scheme adopted by the invention is as follows:
a preparation method of a photo-curing flexible resin material with magnetism comprises the following steps:
s1, preparing resin: the method specifically comprises the following steps:
s101, prefabricating raw materials: pouring a certain amount of flexible photosensitive resin into a large beaker, adding 0.2wt% of resin thickener, stirring for 5min by using a tetrafluoro rod, and uniformly mixing to obtain a resin raw material;
the flexible photosensitive resin consists of resin monomers (various acrylic resins, unsaturated polyesters, polyurethane and other resin systems), prepolymer (adipic acid polyester glycol, polycaprolactone glycol and the like) and a photosensitizer;
the main component of the flexible photosensitive resin is polyurethane acrylic resin, and the density of the polyurethane acrylic resin is 1.125g/ml;
s102, magnetization: the water-based magnetic fluid is prepared by a chemical coprecipitation method, 19g of oleic acid and 20g of Tween are added in the preparation process for chemical modification, and the magnetic particles Fe 3 O 4 A surfactant is formed on the surface, so that the stable existence of the magnetic particles in the base carrier liquid is ensured; pouring quantitative water-based magnetic fluid into a large beaker to be mixed with flexible photosensitive resin, stirring for 1min by using a tetrafluoro rod, preparing light-cured magnetic flexible resin containing 1-15wt% of magnetic particles, uniformly mixing, and adding oleic acid and Tween as surfactants of the iron oxide magnetic particles in the magnetic fluid preparation process by using a chemical coprecipitation method, so that the iron oxide magnetic particles can be uniformly and stably dispersed in the ferrofluid. In the mixing process of the ferrofluid and the resin, the agglomeration and sedimentation phenomena of the iron oxide magnetic particles in the resin are greatly reduced by adding the thickener, so that the proportion of the iron oxide magnetic particles added into the superparamagnetic soft material is increased, and larger magnetism is generated;
the water-based magnetic fluid consists of water-based carrier liquid and magnetic particles Fe 3 O 4 And surfactant coated on the surface of the magnetic particles, wherein the density is 1.38g/ml, fe 3 O 4 The particle content was 0.97g/ml (preparation of water-based Fe 3 O 4 Fe in magnetic fluid prepared by optimizing process of nano magnetic fluid 3 O 4 The particle diameter d of the nano magnetic particles is less than or equal to 10nm, the saturation magnetization M=3.28x10A/M, and the viscosity mu=18mPa.s;
s103, regulating and controlling the concentration of the photosensitizer: according to the dosage of the added magnetic fluid, adding the corresponding photosensitizer (2-hydroxy-2-methyl-1-phenyl-1-acetone), pouring into a stirrer, mixing for at least 10 minutes to obtain a magnetic flexible resin material for photo-curing printing, and adding the photosensitizer on the original photosensitive resin to enhance the curing rate and curing efficiency of the resin and obtain a better curing effect of the photosensitive resin;
s2, resin beatingPrinting: the prepared photo-curing magnetic flexible material is put into a molding plastic groove, and the corresponding bottom exposure time t is set according to the content of the added magnetic fluid 1 For curing the underlying support structure layer and normal exposure time t 2 The ultraviolet light curing printer is used for carrying out light irradiation molding on each layer of resin by utilizing an LCD screen, emitting ultraviolet rays with the wavelength of 405nm, emitting light beams into the magnetic flexible resin material, reflecting the light beams through the surface of a dispersing agent, radiating the light beams to a wider area inside the magnetic flexible resin material, reducing the shielding effect of water-based magnetic fluid, enabling the inside and outside of a printed product to be integrally molded, and facilitating the reduction of layering;
the bottom solidification supporting structure layer adhered to the printing platform is 6 layers, and the thickness of each layer is 0.05mm; the thickness of each layer of the solidified layer of the printing piece is 0.05mm;
bottom exposure time t 1 The time for each layer to solidify when the bottom support structure layer is adhered to the printing platform;
normal exposure time t 2 The time taken for each layer to cure while adhering to the upper cured layer;
s3, post-processing: washing the printed object with absolute ethyl alcohol, washing to remove residual photo-curing resin on the surface of the printed part, and then carrying out secondary reinforcement curing under an ultraviolet lamp, so that the printed product is smooth and uniform in structure.
The invention has the technical effects that:
according to the preparation method of the photo-curing flexible resin material with magnetism, the oleic acid and the Tween-twenty are added as the surfactant of the iron oxide magnetic particles in the process of preparing the magnetic fluid by utilizing a chemical coprecipitation method, so that the iron oxide magnetic particles can be uniformly and stably dispersed in the ferrofluid. In the mixing process of the ferrofluid and the resin, the agglomeration and sedimentation phenomena of the iron oxide magnetic particles in the resin are greatly reduced by adding the thickener, so that the proportion of the iron oxide magnetic particles added into the superparamagnetic soft material is increased, and larger magnetism is generated.
According to the preparation method of the photo-curing flexible resin material with magnetism, the photosensitizer is additionally added to the original photosensitive resin, so that the curing rate and the curing efficiency of the resin can be enhanced, the content of added magnetic fluid is increased, and the magnetism and the sensitivity of a printed matter are enhanced.
Drawings
FIG. 1 is a process flow diagram of a method of preparing a photocurable flexible resin material in accordance with the present invention;
FIG. 2 is a flow chart of the method of the present invention for preparing a resin in step S1.
Detailed Description
The present invention will be specifically described with reference to examples below in order to make the objects and advantages of the present invention more apparent. It should be understood that the following text is intended to describe only one or more specific embodiments of the invention and does not limit the scope of the invention strictly as claimed.
As shown in fig. 1-2, a preparation method of a photo-curing flexible resin material with magnetism comprises the following steps:
s1, preparing resin: the method specifically comprises the following steps:
s101, prefabricating raw materials: pouring a certain amount of flexible photosensitive resin into a large beaker, adding 0.2wt% of resin thickener, stirring for 5min by using a tetrafluoro rod, and uniformly mixing to obtain a resin raw material;
the flexible photosensitive resin consists of resin monomers (various acrylic resins, unsaturated polyesters, polyurethane and other resin systems), prepolymer (adipic acid polyester glycol, polycaprolactone glycol and the like) and a photosensitizer;
the main component of the flexible photosensitive resin is polyurethane acrylic resin, and the density of the polyurethane acrylic resin is 1.125g/ml;
s102, magnetization: the water-based magnetic fluid is prepared by a chemical coprecipitation method, 19g of oleic acid and 20g of Tween are added in the preparation process for chemical modification, and the magnetic particles Fe 3 O 4 A surfactant is formed on the surface, so that the stable existence of the magnetic particles in the base carrier liquid is ensured; pouring quantitative water-based magnetic fluid into a large beaker, mixing with flexible photosensitive resin, stirring for 1min by using a tetrafluoro rod, and preparing the photo-curing magnetic particle-containing photo-curing agent with the mass percentage of 1-15 wt%The magnetic flexible resin is uniformly mixed, and oleic acid and Tween-twenty are added as a surfactant of the iron oxide magnetic particles in the process of preparing the magnetic fluid by utilizing a chemical coprecipitation method, so that the iron oxide magnetic particles can be uniformly and stably dispersed in the ferrofluid. In the mixing process of the ferrofluid and the resin, the agglomeration and sedimentation phenomena of the iron oxide magnetic particles in the resin are greatly reduced by adding the thickener, so that the proportion of the iron oxide magnetic particles added into the superparamagnetic soft material is increased, and larger magnetism is generated;
the water-based magnetic fluid consists of water-based carrier liquid and magnetic particles Fe 3 O 4 And surfactant coated on the surface of the magnetic particles, wherein the density is 1.38g/ml, fe 3 O 4 The particle content was 0.97g/ml (preparation of water-based Fe 3 O 4 Fe in magnetic fluid prepared by optimizing process of nano magnetic fluid 3 O 4 The particle diameter d of the nano magnetic particles is less than or equal to 10nm, the saturation magnetization M=3.28x10A/M, and the viscosity mu=18mPa.s;
s103, regulating and controlling the concentration of the photosensitizer: according to the dosage of the added magnetic fluid, adding the corresponding photosensitizer (2-hydroxy-2-methyl-1-phenyl-1-acetone) and the dispersing agent, pouring into a stirrer, mixing for at least 10 minutes to obtain the magnetic flexible resin material for photo-curing printing, and adding the photosensitizer on the original photosensitive resin to enhance the curing rate and curing efficiency of the resin and improve the content of the added magnetic fluid, thereby enhancing the magnetism and sensitivity of the printed matter;
s2, resin printing: the prepared photo-curing magnetic flexible material is put into a molding plastic groove, and the corresponding bottom exposure time t is set according to the content of the added magnetic fluid 1 The method comprises the steps of (1) curing a bottom support structure layer and a normal exposure time t2 for curing a printed piece layer, putting the cured printed piece layer into a photo-curing printer for printing, wherein the photo-curing printer is used for carrying out photo-forming on each layer of resin by utilizing an LCD screen, emitting ultraviolet rays with the wavelength of 405nm by the photo-curing printer, injecting light beams into a magnetic flexible resin material, and curing the magnetic resin layer with the wavelength of 0.05mm;
the bottom solidification supporting structure layer adhered to the printing platform is 6 layers, and the thickness of each layer is 0.05mm; the thickness of each layer of the solidified layer of the printing piece is 0.05mm, and the bonding firmness of multi-layer solidification is good;
the bottom exposure time t1 is the time for curing each layer when the bottom support structure layer is adhered to the printing platform, the time is sufficient, and the curing hardness of each layer is good;
the normal exposure time t2 is the time for each layer to be cured when the upper layer is adhered to the cured layer, the time is sufficient, and the hardness of each layer to be cured is good;
s3, post-processing: washing the printed object with absolute ethyl alcohol, washing to remove residual photo-curing resin on the surface of the printed part, and then carrying out secondary reinforcement curing under an ultraviolet lamp, so that the printed product is smooth and uniform in structure.
The invention is suitable for most desktop LCD screen irradiation photo-curing printers.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention. Structures, devices and methods of operation not specifically described and illustrated herein, unless otherwise indicated and limited, are implemented according to conventional means in the art.

Claims (9)

1. A preparation method of a photo-curing flexible resin material with magnetism is characterized by comprising the following steps: the preparation method comprises the following steps:
s1, preparing resin: the method specifically comprises the following steps:
s101, prefabricating raw materials: pouring a certain amount of flexible photosensitive resin into a large beaker, adding a resin thickener, and stirring and mixing to obtain a resin raw material;
s102, magnetization: the water-based magnetic fluid is prepared by a chemical coprecipitation method, 19g of oleic acid and 20g of Tween are added in the preparation process for chemical modification, and the magnetic particles Fe 3 O 4 A surfactant is formed on the surface, so that the stable existence of the magnetic particles in the base carrier liquid is ensured; pouring quantitative water-based magnetic fluid into a large beaker and flexible photosensitive resinMixing and stirring to prepare photo-curing magnetic flexible resin, and uniformly mixing;
s103, regulating and controlling the concentration of the photosensitizer: adding a photosensitizer according to the dosage of the added magnetic fluid, and pouring the photosensitizer into a stirrer for mixing to obtain a magnetic flexible resin material for photo-curing printing;
s2, resin printing: the prepared photo-curing magnetic flexible material is put into a molding plastic groove, and the corresponding bottom exposure time t is set 1 For curing the underlying support structure layer and normal exposure time t 2 The photo-curing printer is used for placing the cured printing piece layer into the photo-curing printer for printing;
s3, post-processing: washing the printed object with absolute ethyl alcohol, washing to remove residual photo-curing resin on the surface of the printed object, and then carrying out secondary reinforcement curing under an ultraviolet lamp.
2. The method for producing a photocurable flexible resin material with magnetic properties according to claim 1, characterized in that: the mass percentage of the resin thickener in the step S101 is 0.2wt% of polyurethane acrylic resin.
3. The method for producing a photocurable flexible resin material with magnetic properties according to claim 1, characterized in that: the flexible photosensitive resin in the step S101 comprises polyurethane acrylic resin with a density of 1.125 g/ml.
4. The method for producing a photocurable flexible resin material with magnetic properties according to claim 1, characterized in that: the mass percentage of the photo-curing magnetic particles in the step S102 is 1-15 wt%.
5. The method for producing a photocurable flexible resin material with magnetic properties according to claim 1, characterized in that: the mixing time in the stirrer in the step S103 is at least 10 minutes.
6. The method for producing a photocurable flexible resin material with magnetic properties according to claim 1, characterized in that: the light curing machine emits ultraviolet rays with the wavelength of 405 nm.
7. The method for producing a photocurable flexible resin material with magnetic properties according to claim 1, characterized in that: the bottom solidification supporting structure layer adhered to the printing platform in the step S2 is 6 layers, and the thickness of each layer is 0.05mm; the thickness of each cured layer of the printing piece was 0.05mm.
8. The method for producing a photocurable flexible resin material with magnetic properties according to claim 1, characterized in that: bottom exposure time t in step S2 1 The time it takes for each layer to cure while it is adhered to the bottom support structure layer of the print platform.
9. The method for producing a photocurable flexible resin material with magnetic properties according to claim 1, characterized in that: the normal exposure time t in the step S2 2 The time taken for each layer to cure while adhering to the upper cured layer.
CN202311620537.3A 2023-11-30 2023-11-30 Preparation method of photo-curing flexible resin material with magnetism Pending CN117645788A (en)

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