CN108623847B - Preparation method of model for simulating molecules - Google Patents
Preparation method of model for simulating molecules Download PDFInfo
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- CN108623847B CN108623847B CN201810590726.3A CN201810590726A CN108623847B CN 108623847 B CN108623847 B CN 108623847B CN 201810590726 A CN201810590726 A CN 201810590726A CN 108623847 B CN108623847 B CN 108623847B
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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
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C08L33/10—Homopolymers or copolymers of methacrylic acid esters
- C08L33/12—Homopolymers or copolymers of methyl methacrylate
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The invention provides a preparation method of a model for simulating molecules, which comprises a magnetic ball model for simulating atoms in the molecules and a bond roller model connected between the atoms, wherein the bond roller model of polymethyl methacrylate is prepared by an injection cross-linking method, the magnetic ball model of the polymethyl methacrylate containing magnetic powder is prepared by the injection cross-linking method, the formed magnetic ball model is used as the atom model and is built together with the bond roller model into the molecular model, and color master batches are added in the preparation processes of the magnetic ball model and the bond roller model for dyeing; the key rod model includes rotatory stick and sets up in the connective bar at rotatory stick both ends, and rotatory ring of key rod model, rotatory ring drive rotatory stick and rotate, and the magnetic ball model of the simulation molecule of being convenient for and the reassembly and the dismantlement of key rod model. The invention has no limit to the number and the positions of the key positions on the surface of the atomic model, and reduces the number precision of the moulds required in the production process of the original club model.
Description
Technical Field
The invention belongs to the field of teaching aids, and particularly relates to a preparation method of a model for simulating molecules.
Background
The teaching aid is a general name of various appliances used by students to understand teaching contents visually and vividly and appliances used by teachers during teaching, can improve learning interest of the students, enrich perceptual knowledge of the students, help the students to form clear concepts, and develop observation ability and thinking ability of the students. The ball stick model (bat model) is a space filling model, is used for expressing the three-dimensional space distribution of chemical molecules, expresses the ball stick model (bat model) by a real object, and is a common teaching demonstration mode for chemistry teaching in junior middle schools and high schools. The physical representation of the ball-and-stick model (bat model) represents the covalent bond between two atoms with a stick-like model that also connects the atoms represented by the spherical model. The existing ball-rod model expressed by real objects is characterized in that a plurality of key holes are reserved on a manufactured spherical atom model, a canned key-rod model is inserted into the holes, and two ends of the key-rod model are respectively arranged in the key holes on the two spherical atom models; when the bond stick model is used for building a molecular model, a spherical atom model with a proper number of bond holes at proper positions is required to be selected, the positions of the bond holes are reserved on an atom model, and the molecular model can contain various atom types and molecular bond forms with different bond number and bond positions. The existing ball stick model for real object representation is designed with atom models with different numbers and positions of multiple key holes, while a set of real object ball stick model usually comprises atom models with limited numbers and different types, when a molecular model with more atoms of the same type needs to be assembled, multiple sets of ball stick models are often needed to be assembled together, and the unused type of atom models can be left unused.
Disclosure of Invention
In order to solve the problems, the invention provides a preparation method of a model for simulating molecules, which has no limitation on the number and the positions of bond positions on the surface of an atom model through a magnetic ball model for simulating atoms in the molecules and a bond stick model connected between the atoms, reduces the number and the precision of molds required in the production process of the original ball stick model and improves the production efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method of preparing a model for simulating molecules, comprising a magnetic sphere model simulating atoms in a molecule and a bond stick model connected between the atoms, characterized by: the method comprises the following specific steps:
step one, dispersing a coupling agent and magnetic powder in a water and ethanol solution under mechanical stirring, dropwise adding a hydrolysis solution of the coupling agent into the ethanol solution in which the magnetic powder is dispersed, heating to 60-70 ℃, stirring for 2 hours, centrifuging, cleaning with absolute ethanol, and drying to obtain magnetic powder coated with the coupling agent;
step two, adding methyl methacrylate and polymethyl methacrylate into a reaction kettle, heating and refluxing at 60 ℃ until the polymethyl methacrylate is completely dissolved into the methyl methacrylate, and obtaining a mixed melt of the polymethyl methacrylate and the methyl methacrylate;
step three, adding 0.05-0.1% of initiator into part of the mixed melt in the step two, stirring, mixing the taken mixed melt with the first-color master batch in a double-screw extruder, extruding, injecting into a first injection mold through an injection device, wherein the first injection mold is a rod-shaped injection mold of a key rod model, heating the first injection mold to 50-60 ℃, polymerizing at a low temperature for 6-9 h, continuously heating the injection mold to 100-110 ℃, preserving heat for 2h, carrying out aging treatment, cooling, and demolding to obtain the key rod model;
step four, adding the magnetic powder coated with the coupling agent obtained in the step one into the mixed melt remaining in the step two, stirring for 5-9 hours to obtain a uniformly mixed magnetic powder mixture, and transferring the uniformly mixed magnetic powder mixture into a double-screw extruder;
step five, adding the second color master batch from a feed inlet of the double-screw extruder in the step four, mixing the second color master batch with the magnetic powder mixture, extruding the second color master batch and the magnetic powder mixture by the screw extruder, and granulating;
step six, stirring the particles obtained in the step five at 55-65 ℃, adding 0.05-0.1% of initiator when the particles become fluid, continuously stirring for 0.5-1 h at 75-85 ℃, and cooling to room temperature to obtain a prepolymer dispersed with magnetic powder;
step seven, extruding the prepolymer obtained in the step six through a screw of an injection molding machine and injecting the prepolymer into a second injection mold, wherein the second injection mold is a spherical injection mold, the second injection mold is heated to 50-60 ℃ for low-temperature polymerization, the polymerization time is 6-9 hours, the injection mold is continuously heated to 100-110 ℃, and the temperature is kept for 2 hours for aging treatment;
and step eight, naturally cooling the injection mold to room temperature, opening the injection mold, and demolding to obtain the atomic magnetic ball model.
Further, in the step one, the mass concentration of the magnetic powder ethanol solution is 15g/L, the magnetic powder is subjected to ultrasonic dispersion in the ethanol solution, the mass concentration of the coupling agent water solution is 0.3g/mL, and the mass ratio of the magnetic powder to the coupling agent is 1-10.
Further, the magnetic powder is Nd2Fe14And B, magnetic powder, wherein the coupling agent is a silane coupling agent.
Furthermore, the mass ratio of the methyl methacrylate to the polymethyl methacrylate in the second step is 0.5-2, and the mass ratio of the methyl methacrylate to the magnetic powder in the fourth step is 1-5.
Furthermore, the first color master batch is white master batch, the second color master batch also comprises a plurality of color master batches, and the second color master batch added into the double-screw extruder in the fifth step is one or more of the plurality of color master batches.
Further, the stirring is non-magnetic stirring.
Furthermore, the key stick model is also connected with two iron blocks.
Furthermore, the key stick model comprises a rotating stick and connecting sticks arranged at two ends of the rotating stick, the rotating stick comprises a threaded column and a rotating ring sleeved on the threaded column, the rotating ring is arranged in the middle of the threaded column, the directions of threads on the threaded columns at two sides of the rotating ring are opposite, two ends of the threaded column are respectively connected with an iron block, and threads at two sides of the rotating ring of the threaded column are connected to the connecting sticks; the connecting rods are provided with inner channels through which the iron blocks can pass, one ends of the two connecting rods are provided with inner threads matched with the outer threads of the threaded columns, the two connecting rods are further connected to the two sides of the rotating ring through the inner threads respectively, the other ends of the connecting rods are far away from the direction of the rotating ring, and the other ends of the connecting rods are further connected with the suckers; the sucking disc includes sucking disc casing and sucking disc groove, the sucking disc casing is transparent circular cone casing, and the top of sucking disc casing still is equipped with the sucking disc groove that supplies the iron plate to place, the sucking disc groove with still be equipped with one or more through-hole between the sucking disc casing.
Furthermore, the side wall of the connecting rod is also provided with air holes.
Further, the both ends of screw thread post still are equipped with the screw hole respectively, and the outer wall of iron plate is equipped with to the external screw thread that matches with the screw hole, iron hole threaded connection in the screw thread post.
The invention has the beneficial effects that:
1. according to the preparation method of the model for simulating molecules, the magnetic ball model of the polymethyl methacrylate containing the magnetic powder is prepared by an injection molding crosslinking method, the coloring is easy, the preparation method is simple, and the surface of the magnetic powder is coated with the coupling agent, so that the powdery magnetic powder can be better dispersed in the polymethyl methacrylate;
2. according to the preparation method of the model for simulating molecules, the atomic model is a magnetic ball model capable of being colored, the key stick model is provided with the iron block and the sucking disc and is connected to the atomic model represented by the magnetic ball model through the magnetic attraction of the iron block and the magnetic ball, the connection is convenient, the sucking disc can reinforce the adhesive force of the key stick model on the atomic model to a certain extent, and the key stick model is prevented from sliding on the surface of the magnetic ball; when the key and stick model is disassembled, the rotating ring of the key and stick model is rotated, the iron block leaves the surface of the magnetic ball model, air enters the sucker shell through the air holes on the connecting rod and the through holes on the sucker, and the key and stick model is convenient to disassemble from the surface of the magnetic ball model.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, each reference number in the figure is: 1. rotating the rod; 101. a threaded post; 102. a rotating ring; 2. a connecting rod; 3. an iron block; 4. a threaded hole; 5. an inner channel; 6. a suction cup housing; 7. a sucker groove; 8. a through hole; 9. and (4) air holes.
Detailed Description
In order that those skilled in the art will be able to better understand the technical solutions provided by the present invention, the following description is provided in conjunction with the specific embodiments.
The present invention will be fully understood from the following description of the embodiments, which are not intended to limit the scope of the present invention.
A magnetic ball model of polymethyl methacrylate containing magnetic powder is prepared by an injection cross-linking method, the magnetic ball model is used as an atomic model, a bond stick model of the polymethyl methacrylate is also prepared by the injection cross-linking method, chemical molecules formed by molecular bonds between atoms are jointly constructed by covalent bonds represented by the bond stick model and atoms represented by the magnetic ball model, and the main representative of the chemical molecules is organic molecules with a C framework.
Example 1
The molecular model is prepared by adopting a methyl methacrylate injection molding crosslinking method, and the key roller model is prepared by the following steps:
adding methyl methacrylate and polymethyl methacrylate into a reaction kettle, heating and refluxing at 60 ℃, pretreating a methyl methacrylate monomer, removing a polymerization inhibitor until the methyl methacrylate is completely dissolved in the methyl methacrylate to obtain a mixed melt of the methyl methacrylate and the methyl methacrylate; adding 0.05% of initiator into the mixed melt, stirring at normal temperature, mixing the mixed melt with the first-color master batch in a double-screw extruder, extruding, injecting into a first injection mold through an injection device, wherein the first injection mold is a rod-shaped injection mold of a key rod model, heating the first injection mold to 50 ℃, polymerizing at low temperature for 6 hours, continuously heating the injection mold to 100 ℃, preserving heat for 2 hours, aging, cooling, and demolding to obtain the key rod model; the key stick model is also adsorbed on the surface of the magnetic ball model by virtue of the magnetic adsorption effect of the two iron blocks 3, the key stick model comprises a rotary rod 1 and connecting rods 2 arranged at two ends of the rotary rod 1, the rotary rod 1 comprises a threaded column 101 and a rotary ring 102 sleeved on the threaded column 101, the rotary ring 102 is arranged in the middle of the threaded column 101, the directions of threads on the threaded columns 101 at two sides of the rotary ring 102 are opposite, the two ends of the threaded column 101 are also respectively connected with the iron blocks 3, and the threaded column 101 and the threads at two sides of the rotary ring 102 are connected to the connecting rods 2; the connecting rods 2 are provided with inner channels 5 through which the iron blocks 3 can pass, one ends of the two connecting rods 2 are provided with inner threads matched with the outer threads of the threaded columns 101, the two connecting rods 2 are connected to two sides of the rotating ring 102 through the inner threads respectively, the other ends of the connecting rods 2 are far away from the direction of the rotating ring 102, and the other ends of the connecting rods 2 are connected with the suckers 7; the sucking disc 7 includes sucking disc casing 6 and sucking disc groove 7, and sucking disc casing 6 is transparent circular cone casing, and the top of sucking disc casing 6 still is equipped with the sucking disc groove 7 that supplies iron plate 3 to place, still is equipped with one or more through-hole 8 between sucking disc groove 7 and the sucking disc casing 6, still is equipped with bleeder vent 9 at the lateral wall of connective bar 2, and the both ends of screw thread post 101 still are equipped with screw hole 4 respectively, and the outer wall of iron plate 3 be equipped with screw hole 4 to the external screw thread that matches, iron hole threaded connection in screw thread post 101.
The iron blocks 3 at the two ends of the key stick model are pressed on the surface of the ball under the action of the magnetic attraction of the magnetic ball model, the rotating ring 102 is rotated, the rotating ring 102 drives the rotating rod 1 to rotate, so that the iron blocks 3 move in the inner channel 5 of the connecting rod 2 and gradually approach to the magnetic ball model, the closer the iron blocks 3 and the magnetic ball model, the larger the magnetic attraction, when the iron blocks 3 move to the end part of the connecting rod 2, the iron blocks 3 are positioned in the suction disc grooves 7 and press the suction discs 7 at the end part of the connecting rod 2 on the surface of the magnetic ball model, the suction discs 7 are made of nitrile rubber, have an adsorption function when being attached to the spherical surface and have larger pulling force, and thus, the end surfaces of the key stick model are adsorbed on the surface of the magnetic ball model under the magnetic adsorption and extrusion action of the suction discs 7 and the iron blocks; when the key rod model needs to be dismantled from the surface of the magnetic ball model, the rotating ring 102 is rotated in the opposite direction, the rotating ring 102 drives the rotating rod 1 to rotate, the iron block 3 is made to move in the inner channel 5 of the connecting rod 2 and is gradually far away from the magnetic ball model, the distance between the iron block 3 and the magnetic ball model is gradually far away, the magnetic attraction force applied to the iron block is also gradually reduced, when the iron block 3 moves out of the sucker groove 7, the external gas enters the sucker shell 6 through the air holes 9 and the through holes 8, the sucker 7 is more easily removed from the surface of the magnetic ball, and the magnetic ball model for simulating molecules and the key rod model are convenient to reassemble and disassemble.
The molecular model is prepared by adopting a methyl methacrylate injection molding crosslinking method, and the preparation method of the magnetic ball model comprises the following steps:
step one, silane coupling agents KH570 and Nd are respectively added2Fe14B, dispersing the permanent magnetic powder in water and an absolute ethyl alcohol solution under mechanical stirring, wherein the mass concentration of the magnetic powder ethyl alcohol solution is 15g/L, performing ultrasonic dispersion on the magnetic powder in the ethyl alcohol solution, the mass concentration of the coupling agent aqueous solution is 0.3g/mL, the mass ratio of the magnetic powder to the coupling agent is 1, dropwise adding a hydrolysis solution of the coupling agent into the ethyl alcohol solution in which the magnetic powder is dispersed, heating to 60 ℃, stirring for 2 hours, centrifuging, washing with absolute ethyl alcohol, and drying to obtain the magnetic powder coated with the coupling agent;
step two, adding methyl methacrylate and polymethyl methacrylate with the mass ratio of 0.5 into the reaction kettle, heating and refluxing at 60 ℃ until the polymethyl methacrylate is completely dissolved into the methyl methacrylate, and obtaining a mixed melt of the polymethyl methacrylate and the methyl methacrylate;
step three, adding the magnetic powder coated by the coupling agent obtained in the step one into the mixed melt left in the step two, stirring for 5 hours to obtain a uniformly mixed magnetic powder mixture, wherein the mass ratio of the methyl methacrylate to the magnetic powder is 1, and transferring the uniformly mixed magnetic powder mixture into a double-screw extruder;
step four, adding the second color master batch from a feed inlet of the double-screw extruder in the step four, mixing the second color master batch with the magnetic powder mixture, extruding the second color master batch and the magnetic powder mixture by the screw extruder, and granulating;
step five, stirring the particles obtained in the step four at 55 ℃, adding 0.05% of initiator when the particles become fluid, continuously stirring for 0.5h at 75 ℃, and cooling to room temperature to obtain a prepolymer dispersed with magnetic powder;
step six, extruding the prepolymer obtained in the step five through a screw of an injection molding machine and injecting the prepolymer into a second injection mold, wherein the second injection mold is a spherical injection mold, the second injection mold is heated to 50 ℃ for low-temperature polymerization, the polymerization time is 6 hours, the injection mold is continuously heated to 100 ℃, and the temperature is kept for 2 hours for aging treatment;
and seventhly, naturally cooling the injection mold to room temperature, opening the injection mold, and demolding to obtain the atomic magnetic ball model.
Wherein, still add diamagnetic metal such as copper, cadmium in the cauldron wall of reation kettle, the screw rod of twin-screw extruder and the panel of casing and just weaken the influence of two equipment to the magnetic, and injection mold adopts aluminium system mould. And adding permanent magnet type magnetic powder into the magnetic ball model, and then performing injection molding, wherein the molded magnetic ball model is used as an atomic model and is combined with the key stick model together to form a molecular model. The magnetic ball model is further dyed by adding color master batches to express different types of atoms, for example, the magnetic ball model added with the black color master batch is used for expressing carbon atoms, the magnetic ball model added with the white color master batch is used for expressing hydrogen atoms, the magnetic ball model added with the red color master batch is used for expressing oxygen atoms, and the nitrogen atoms are expressed by the magnetic ball model added with the blue color master batch. When the magnetic linkage connection device is used, the molecular frameworks are sequentially connected, the frameworks are assembled in the order of atoms, the key stick models and the atoms, then the branched chains outside the frameworks are connected, the magnetic ball models are held by one hand during connection, the end parts of the key stick models are adsorbed on the surfaces of the magnetic ball models through the suckers 7 by the other hand, the connection points of the key stick models and the magnetic ball models are selected according to the distribution of molecular bonds, then the rotating ring 102 of the key stick models is rotated, the iron blocks 3 connected with the key stick models are also adsorbed on the surfaces of the magnetic ball models, and the key stick models are prevented from sliding or falling off on the surfaces of the magnetic ball models.
Example 2
The molecular model is prepared by adopting a methyl methacrylate injection molding crosslinking method, and the key roller model is prepared by the following steps:
adding methyl methacrylate and polymethyl methacrylate into a reaction kettle, heating and refluxing at 60 ℃ until the polymethyl methacrylate is completely dissolved into the methyl methacrylate to obtain a mixed melt of the polymethyl methacrylate and the methyl methacrylate; adding 0.08% of initiator into the mixed melt, stirring at normal temperature, mixing the mixed melt with white color master batch in a double-screw extruder, extruding, injecting into a first injection mold through an injection device, wherein the first injection mold is a stick-shaped injection mold of a key stick model, the first injection mold is divided into two injection molds of a connecting rod 2 model and a rotating rod 1 model, the first injection mold is heated to 55 ℃ for low-temperature polymerization for 7h, the injection mold is continuously heated to 105 ℃, the temperature is kept for 2h for aging treatment, and the key stick model is obtained after cooling and demolding; the key stick model is also adsorbed on the surface of the magnetic ball model by virtue of the magnetic adsorption effect of the two iron blocks 3, the key stick model comprises a rotary rod 1 and connecting rods 2 arranged at two ends of the rotary rod 1, the rotary rod 1 comprises a threaded column 101 and a rotary ring 102 sleeved on the threaded column 101, the rotary ring 102 is arranged in the middle of the threaded column 101, the directions of threads on the threaded columns 101 at two sides of the rotary ring 102 are opposite, the two ends of the threaded column 101 are also respectively connected with the iron blocks 3, and the threaded column 101 and the threads at two sides of the rotary ring 102 are connected to the connecting rods 2; the connecting rods 2 are provided with inner channels 5 through which the iron blocks 3 can pass, one ends of the two connecting rods 2 are provided with inner threads matched with the outer threads of the threaded columns 101, the two connecting rods 2 are connected to two sides of the rotating ring 102 through the inner threads respectively, the other ends of the connecting rods 2 are far away from the direction of the rotating ring 102, and the other ends of the connecting rods 2 are connected with the suckers 7; the sucking disc 7 includes sucking disc casing 6 and sucking disc groove 7, and sucking disc casing 6 is transparent circular cone casing, and the top of sucking disc casing 6 still is equipped with the sucking disc groove 7 that supplies iron plate 3 to place, still is equipped with one or more through-hole 8 between sucking disc groove 7 and the sucking disc casing 6, still is equipped with bleeder vent 9 at the lateral wall of connective bar 2, and the both ends of screw thread post 101 still are equipped with screw hole 4 respectively, and the outer wall of iron plate 3 be equipped with screw hole 4 to the external screw thread that matches, iron hole threaded connection in screw thread post 101.
The iron blocks 3 at the two ends of the key stick model are pressed on the surface of the ball under the action of the magnetic attraction of the magnetic ball model, the rotating ring 102 is rotated, the rotating ring 102 drives the rotating rod 1 to rotate, so that the iron blocks 3 move in the inner channel 5 of the connecting rod 2 and gradually approach to the magnetic ball model, the closer the iron blocks 3 and the magnetic ball model, the larger the magnetic attraction, when the iron blocks 3 move to the end part of the connecting rod 2, the iron blocks 3 are positioned in the suction disc grooves 7 and press the suction discs 7 at the end part of the connecting rod 2 on the surface of the magnetic ball model, the suction discs 7 are made of nitrile rubber, have an adsorption function when being attached to the spherical surface and have larger pulling force, and thus, the end surfaces of the key stick model are adsorbed on the surface of the magnetic ball model under the magnetic adsorption and extrusion action of the suction discs 7 and the iron blocks; when the key rod model needs to be dismantled from the surface of the magnetic ball model, the rotating ring 102 is rotated in the opposite direction, the rotating ring 102 drives the rotating rod 1 to rotate, the iron block 3 is made to move in the inner channel 5 of the connecting rod 2 and is gradually far away from the magnetic ball model, the distance between the iron block 3 and the magnetic ball model is gradually far away, the magnetic attraction force applied to the iron block is also gradually reduced, when the iron block 3 moves out of the sucker groove 7, the external gas enters the sucker shell 6 through the air holes 9 and the through holes 8, the sucker 7 is more easily removed from the surface of the magnetic ball, and the magnetic ball model for simulating molecules and the key rod model are convenient to reassemble and disassemble.
The molecular model is prepared by adopting a methyl methacrylate injection molding crosslinking method, and the preparation method of the magnetic ball model comprises the following steps:
step one, silane coupling agents KH560 and Nd are respectively added2Fe14B, dispersing the permanent magnetic powder in water and absolute ethanol solution under mechanical stirring, wherein the mass concentration of the ethanol solution of the magnetic powder is 15g/L, and performing ultrasonic dispersion on the magnetic powder in the ethanol solutionDropwise adding a hydrolysis solution of the coupling agent into an ethanol solution in which the magnetic powder is dispersed, heating to 65 ℃, stirring for 2 hours, centrifuging, washing with absolute ethanol, and drying to obtain the magnetic powder coated with the coupling agent, wherein the mass concentration of the coupling agent aqueous solution is 0.3g/mL, and the mass ratio of the magnetic powder to the coupling agent is 1: 0.12;
step two, adding methyl methacrylate and polymethyl methacrylate with the mass ratio of 1 into a reaction kettle, heating and refluxing at 60 ℃ until the polymethyl methacrylate is completely dissolved into the methyl methacrylate, and obtaining a mixed melt of the polymethyl methacrylate and the methyl methacrylate;
step three, adding the magnetic powder coated by the coupling agent obtained in the step one into the mixed melt left in the step two, stirring for 8 hours to obtain a uniformly mixed magnetic powder mixture, wherein the mass ratio of the methyl methacrylate to the magnetic powder is 2, and transferring the uniformly mixed magnetic powder mixture into a double-screw extruder;
step four, adding the second color master batch from a feed inlet of the double-screw extruder in the step four, mixing the second color master batch with the magnetic powder mixture, extruding the second color master batch and the magnetic powder mixture by the screw extruder, and granulating;
step five, stirring the particles obtained in the step four at 60 ℃, adding 0.08% of initiator when the particles become fluid, continuously stirring for 45min at 80 ℃, and cooling to room temperature to obtain a prepolymer dispersed with magnetic powder;
step six, extruding the prepolymer obtained in the step five through a screw of an injection molding machine and injecting the prepolymer into a second injection mold, wherein the second injection mold is a spherical injection mold, the second injection mold is heated to 55 ℃ for low-temperature polymerization, the polymerization time is 7 hours, the injection mold is continuously heated to 105 ℃, and the temperature is kept for 2 hours for aging treatment;
and seventhly, naturally cooling the injection mold to room temperature, opening the injection mold, and demolding to obtain the atomic magnetic ball model.
And adding permanent magnet type magnetic powder into the magnetic ball model, and then performing injection molding, wherein the molded magnetic ball model is used as an atomic model and is combined with the key stick model together to form a molecular model. The magnetic ball model is further dyed by adding color master batches to express different types of atoms, for example, the magnetic ball model added with the black color master batch is used for expressing carbon atoms, the magnetic ball model added with the white color master batch is used for expressing hydrogen atoms, the magnetic ball model added with the red color master batch is used for expressing oxygen atoms, and the nitrogen atoms are expressed by the magnetic ball model added with the blue color master batch. When the magnetic linkage connection device is used, the molecular frameworks are sequentially connected, the frameworks are assembled in the order of atoms, the key stick models and the atoms, then the branched chains outside the frameworks are connected, the magnetic ball models are held by one hand during connection, the end parts of the key stick models are adsorbed on the surfaces of the magnetic ball models through the suckers 7 by the other hand, the connection points of the key stick models and the magnetic ball models are selected according to the distribution of molecular bonds, then the rotating ring 102 of the key stick models is rotated, the iron blocks 3 connected with the key stick models are also adsorbed on the surfaces of the magnetic ball models, and the key stick models are prevented from sliding or falling off on the surfaces of the magnetic ball models. Meanwhile, a ball bond model which is connected with a magnetic ball model and a key stick model and is used for simulating molecular bond fracture and regeneration can be prepared, the ball bond model comprises a nonmagnetic ball model used for simulating atoms and a nonmagnetic key model used for simulating molecular bonds, the ball model is fixedly connected with the key model, 0.05% of initiator can be added into mixed melt of polymethyl methacrylate and methyl methacrylate for direct injection molding, one end of the key model is fixedly connected with the ball model, the other end of the key model is also adsorbed on the surface of another magnetic ball representing atoms through an iron block 3 under the action of magnetic adsorption, the key model comprises a rotating rod 1 and a connecting rod 2 arranged at one end of the rotating rod 1, the rotating rod 1 comprises a threaded column 101 and a rotating ring 102 sleeved on the threaded column 101, the rotating ring 102 is arranged in the middle of the threaded column 101, one end of the threaded column 101 is also respectively connected with the iron block 3, the threaded column 101 is also connected with the connecting rod 2 through threads on two sides of the rotating ring 102; an inner channel 5 through which the iron block 3 can pass is arranged on the connecting rod 2, an internal thread matched with the external thread of the threaded column 101 is arranged at one end of the connecting rod 2, the connecting rod 2 is further connected to one side of the rotating ring 102 through the internal thread, the other end of the connecting rod 2 is far away from the direction of the rotating ring 102, and the other end of the connecting rod 2 is further connected with the sucker 7; the sucking disc 7 includes sucking disc casing 6 and sucking disc groove 7, and sucking disc casing 6 is transparent circular cone casing, and the top of sucking disc casing 6 still is equipped with the sucking disc groove 7 that supplies iron plate 3 to place, still is equipped with one or more through-hole 8 between sucking disc groove 7 and the sucking disc casing 6, still is equipped with bleeder vent 9 at the lateral wall of connective bar 2, and the both ends of screw thread post 101 still are equipped with screw hole 4 respectively, and the outer wall of iron plate 3 be equipped with screw hole 4 to the external screw thread that matches, iron hole threaded connection in screw thread post 101.
Example 3
The molecular model is prepared by adopting a methyl methacrylate injection molding crosslinking method, and the key roller model is prepared by the following steps:
adding methyl methacrylate and polymethyl methacrylate into a reaction kettle, heating and refluxing at 60 ℃ until the polymethyl methacrylate is completely dissolved into the methyl methacrylate to obtain a mixed melt of the polymethyl methacrylate and the methyl methacrylate; adding 0.09% of initiator into the mixed melt, stirring at normal temperature, mixing the mixed melt with the first color master batch in a double-screw extruder, extruding, injecting into a first injection mold through an injection device, wherein the first injection mold is a rod-shaped injection mold of a key rod model, heating the first injection mold to 55 ℃, polymerizing at low temperature for 8 hours, continuously heating the injection mold to 108 ℃, preserving heat for 2 hours, aging, cooling, and demolding to obtain the key rod model; the key stick model is also adsorbed on the surface of the magnetic ball model by virtue of the magnetic adsorption effect of the two iron blocks 3, the key stick model comprises a rotary rod 1 and connecting rods 2 arranged at two ends of the rotary rod 1, the rotary rod 1 comprises a threaded column 101 and a rotary ring 102 sleeved on the threaded column 101, the rotary ring 102 is arranged in the middle of the threaded column 101, the directions of threads on the threaded columns 101 at two sides of the rotary ring 102 are opposite, the two ends of the threaded column 101 are also respectively connected with the iron blocks 3, and the threaded column 101 and the threads at two sides of the rotary ring 102 are connected to the connecting rods 2; the connecting rods 2 are provided with inner channels 5 through which the iron blocks 3 can pass, one ends of the two connecting rods 2 are provided with inner threads matched with the outer threads of the threaded columns 101, the two connecting rods 2 are connected to two sides of the rotating ring 102 through the inner threads respectively, the other ends of the connecting rods 2 are far away from the direction of the rotating ring 102, and the other ends of the connecting rods 2 are connected with the suckers 7; the sucking disc 7 includes sucking disc casing 6 and sucking disc groove 7, and sucking disc casing 6 is transparent circular cone casing, and the top of sucking disc casing 6 still is equipped with the sucking disc groove 7 that supplies iron plate 3 to place, still is equipped with one or more through-hole 8 between sucking disc groove 7 and the sucking disc casing 6, still is equipped with bleeder vent 9 at the lateral wall of connective bar 2, and the both ends of screw thread post 101 still are equipped with screw hole 4 respectively, and the outer wall of iron plate 3 be equipped with screw hole 4 to the external screw thread that matches, iron hole threaded connection in screw thread post 101.
The iron blocks 3 at the two ends of the key stick model are pressed on the surface of the ball under the action of the magnetic attraction of the magnetic ball model, the rotating ring 102 is rotated, the rotating ring 102 drives the rotating rod 1 to rotate, so that the iron blocks 3 move in the inner channel 5 of the connecting rod 2 and gradually approach to the magnetic ball model, the closer the iron blocks 3 and the magnetic ball model, the larger the magnetic attraction, when the iron blocks 3 move to the end part of the connecting rod 2, the iron blocks 3 are positioned in the suction disc grooves 7 and press the suction discs 7 at the end part of the connecting rod 2 on the surface of the magnetic ball model, the suction discs 7 are made of nitrile rubber, have an adsorption function when being attached to the spherical surface and have larger pulling force, and thus, the end surfaces of the key stick model are adsorbed on the surface of the magnetic ball model under the magnetic adsorption and extrusion action of the suction discs 7 and the iron blocks; when the key rod model needs to be dismantled from the surface of the magnetic ball model, the rotating ring 102 is rotated in the opposite direction, the rotating ring 102 drives the rotating rod 1 to rotate, the iron block 3 is made to move in the inner channel 5 of the connecting rod 2 and is gradually far away from the magnetic ball model, the distance between the iron block 3 and the magnetic ball model is gradually far away, the magnetic attraction force applied to the iron block is also gradually reduced, when the iron block 3 moves out of the sucker groove 7, the external gas enters the sucker shell 6 through the air holes 9 and the through holes 8, the sucker 7 is more easily removed from the surface of the magnetic ball, and the magnetic ball model for simulating molecules and the key rod model are convenient to reassemble and disassemble.
The molecular model is prepared by adopting a methyl methacrylate injection molding crosslinking method, and the preparation method of the magnetic ball model comprises the following steps:
step one, respectively using a silane coupling agent, wherein the silane coupling agent is a silane coupling agent containing carbon-carbon double bonds, the silane coupling agent and Nd2Fe14B, dispersing the permanent magnetic powder in water and absolute ethanol solution under mechanical stirring, wherein the mass concentration of the ethanol solution of the magnetic powder is 15g/L, performing ultrasonic dispersion on the magnetic powder in the ethanol solution, the mass concentration of the coupling agent aqueous solution is 0.3g/mL, the mass ratio of the magnetic powder to the coupling agent is 5:1, and dispersing the magnetic powder in the water and absolute ethanol solutionDropwise adding a coupling agent hydrolysis solution into the ethanol solution of the powder, heating to 68 ℃, stirring for 2 hours, centrifuging, washing with absolute ethanol, and drying to obtain coupling agent coated magnetic powder;
step two, adding methyl methacrylate and polymethyl methacrylate with the mass ratio of 1.5 into the reaction kettle, heating and refluxing at 60 ℃ until the polymethyl methacrylate is completely dissolved into the methyl methacrylate, and obtaining a mixed melt of the polymethyl methacrylate and the methyl methacrylate;
step three, adding the magnetic powder coated by the coupling agent obtained in the step one into the mixed melt left in the step two, stirring for 8 hours to obtain a uniformly mixed magnetic powder mixture, wherein the mass ratio of the methyl methacrylate to the magnetic powder is 3, and transferring the uniformly mixed magnetic powder mixture into a double-screw extruder;
step four, adding the second color master batch from a feed inlet of the double-screw extruder in the step four, mixing the second color master batch with the magnetic powder mixture, extruding the second color master batch and the magnetic powder mixture by the screw extruder, and granulating;
step five, stirring the particles obtained in the step four at 62 ℃, adding 0.08 percent of initiator when the particles become fluid, continuously stirring for 0.5h at 80 ℃, and cooling to room temperature to obtain a prepolymer dispersed with magnetic powder;
step six, extruding the prepolymer obtained in the step five through a screw of an injection molding machine and injecting the prepolymer into a second injection mold, wherein the second injection mold is a spherical injection mold, the second injection mold is heated to 58 ℃ for low-temperature polymerization, the polymerization time is 8 hours, the injection mold is continuously heated to 108 ℃, and the temperature is kept for 2 hours for aging treatment;
and seventhly, naturally cooling the injection mold to room temperature, opening the injection mold, and demolding to obtain the atomic magnetic ball model.
Adding permanent magnetic powder into the magnetic ball model, injection molding, wherein the silane coupling agent for modification on the surface of the magnetic powder has double bonds, can participate in the polymerization reaction in the free radical polymerization reaction of the methyl methacrylate, so that the dispersion degree and the stability of the magnetic powder coated by the silane coupling agent in the polymethyl methacrylate are improved, meanwhile, the production processes of the magnetic ball model and the key rod model are both prepared by mixed melt of methyl methacrylate and polymethyl methacrylate, the step of mixing the mixed melt of methyl methacrylate and polymethyl methacrylate as raw materials can combine the preparation processes of the mixed melt of the magnetic ball model and the key rod model, adding methyl methacrylate and polymethyl methacrylate into the same reaction kettle, heating and stirring, and distributing the obtained mixed melt to subsequent processes of key rod model preparation and magnetic ball model respectively through a metering pump; wherein the subsequent process of preparing the key stick model further comprises a double-screw extruder, a high-speed mixer and an injection molding machine, the first color master batch of the key stick model is heated and extruded in the double-screw extruder, the extrusion temperature is 60-90 ℃, the extruded colored mixed melt is also conveyed to a dyeing bin through a feed inlet of the dyeing bin, the dyeing bin is a heat preservation bin, the temperature of a bin body is 60-90 ℃, an observation port is reserved on the dyeing bin, high-temperature-resistant glass is arranged on the observation port, the feed inlet of the dyeing bin is arranged on the bin top or the side wall of the dyeing bin, the bottom of the dyeing bin is also provided with a first discharge port and a second discharge port, the first discharge port is connected with the feed inlet of the extruder, the second discharge port is connected with the feed inlet of the high-speed mixer, an initiator is further added into the high-speed mixer, the dyeing uniformity of the mixed melt is observed from, mixing and extruding the colored mixed melt in the dyeing bin through the first discharge port and the double-screw extruder again, wherein the process can be repeated repeatedly until the dyeing is uniform, and the colored mixed melt with the dyeing uniformity is mixed with the initiator and subjected to injection molding through the high-speed mixer and the injection molding machine in sequence to finally obtain an injection molded key roller model; the dyeing bin can also be used in the dyeing process of the magnetic ball model. The formed magnetic ball model is used as an atomic model and is combined with a bond stick model to form a molecular model. The magnetic ball model is further dyed by adding color master batches to express different types of atoms, for example, the magnetic ball model added with the black color master batch is used for expressing carbon atoms, the magnetic ball model added with the white color master batch is used for expressing hydrogen atoms, the magnetic ball model added with the red color master batch is used for expressing oxygen atoms, and the nitrogen atoms are expressed by the magnetic ball model added with the blue color master batch. When the magnetic linkage connection device is used, the molecular frameworks are sequentially connected, the frameworks are assembled in the order of atoms, the key stick models and the atoms, then the branched chains outside the frameworks are connected, the magnetic ball models are held by one hand during connection, the end parts of the key stick models are adsorbed on the surfaces of the magnetic ball models through the suckers 7 by the other hand, the connection points of the key stick models and the magnetic ball models are selected according to the distribution of molecular bonds, then the rotating ring 102 of the key stick models is rotated, the iron blocks 3 connected with the key stick models are also adsorbed on the surfaces of the magnetic ball models, and the key stick models are prevented from sliding or falling off on the surfaces of the magnetic ball models.
Example 4
The molecular model is prepared by adopting a methyl methacrylate injection molding crosslinking method, and the key roller model is prepared by the following steps:
adding methyl methacrylate and polymethyl methacrylate into a reaction kettle, heating and refluxing at 60 ℃ until the polymethyl methacrylate is completely dissolved into the methyl methacrylate to obtain a mixed melt of the polymethyl methacrylate and the methyl methacrylate; adding 0.1% of initiator into the mixed melt, stirring at normal temperature, mixing the mixed melt with the first-color master batch in a double-screw extruder, extruding, injecting into a first injection mold through an injection device, wherein the first injection mold is a rod-shaped injection mold of a key rod model, heating the first injection mold to 60 ℃, polymerizing at low temperature for 9 hours, continuously heating the injection mold to 110 ℃, preserving heat for 2 hours, aging, cooling, and demolding to obtain the key rod model; the key stick model is also adsorbed on the surface of the magnetic ball model by virtue of the magnetic adsorption effect of the two iron blocks 3, the key stick model comprises a rotary rod 1 and connecting rods 2 arranged at two ends of the rotary rod 1, the rotary rod 1 comprises a threaded column 101 and a rotary ring 102 sleeved on the threaded column 101, the rotary ring 102 is arranged in the middle of the threaded column 101, the directions of threads on the threaded columns 101 at two sides of the rotary ring 102 are opposite, the two ends of the threaded column 101 are also respectively connected with the iron blocks 3, and the threaded column 101 and the threads at two sides of the rotary ring 102 are connected to the connecting rods 2; the connecting rods 2 are provided with inner channels 5 through which the iron blocks 3 can pass, one ends of the two connecting rods 2 are provided with inner threads matched with the outer threads of the threaded columns 101, the two connecting rods 2 are connected to two sides of the rotating ring 102 through the inner threads respectively, the other ends of the connecting rods 2 are far away from the direction of the rotating ring 102, and the other ends of the connecting rods 2 are connected with the suckers 7; the sucking disc 7 includes sucking disc casing 6 and sucking disc groove 7, and sucking disc casing 6 is transparent circular cone casing, and the top of sucking disc casing 6 still is equipped with the sucking disc groove 7 that supplies iron plate 3 to place, still is equipped with one or more through-hole 8 between sucking disc groove 7 and the sucking disc casing 6, still is equipped with bleeder vent 9 at the lateral wall of connective bar 2, and the both ends of screw thread post 101 still are equipped with screw hole 4 respectively, and the outer wall of iron plate 3 be equipped with screw hole 4 to the external screw thread that matches, iron hole threaded connection in screw thread post 101.
The iron blocks 3 at the two ends of the key stick model are pressed on the surface of the ball under the action of the magnetic attraction of the magnetic ball model, the rotating ring 102 is rotated, the rotating ring 102 drives the rotating rod 1 to rotate, so that the iron blocks 3 move in the inner channel 5 of the connecting rod 2 and gradually approach to the magnetic ball model, the closer the iron blocks 3 and the magnetic ball model, the larger the magnetic attraction, when the iron blocks 3 move to the end part of the connecting rod 2, the iron blocks 3 are positioned in the suction disc grooves 7 and press the suction discs 7 at the end part of the connecting rod 2 on the surface of the magnetic ball model, the suction discs 7 are made of nitrile rubber, have an adsorption function when being attached to the spherical surface and have larger pulling force, and thus, the end surfaces of the key stick model are adsorbed on the surface of the magnetic ball model under the magnetic adsorption and extrusion action of the suction discs 7 and the iron blocks; when the key rod model needs to be dismantled from the surface of the magnetic ball model, the rotating ring 102 is rotated in the opposite direction, the rotating ring 102 drives the rotating rod 1 to rotate, the iron block 3 is made to move in the inner channel 5 of the connecting rod 2 and is gradually far away from the magnetic ball model, the distance between the iron block 3 and the magnetic ball model is gradually far away, the magnetic attraction force applied to the iron block is also gradually reduced, when the iron block 3 moves out of the sucker groove 7, the external gas enters the sucker shell 6 through the air holes 9 and the through holes 8, the sucker 7 is more easily removed from the surface of the magnetic ball, and the magnetic ball model for simulating molecules and the key rod model are convenient to reassemble and disassemble.
The molecular model is prepared by adopting a methyl methacrylate injection molding crosslinking method, and the preparation method of the magnetic ball model comprises the following steps:
step one, silane coupling agents KH570 and Nd are respectively added2Fe14B, dispersing in water and absolute ethanol solution under mechanical stirring, wherein the magnetic powder BThe mass concentration of the alcohol solution is 15g/L, the magnetic powder is subjected to ultrasonic dispersion in the ethanol solution, the mass concentration of the coupling agent aqueous solution is 0.3g/mL, the mass ratio of the magnetic powder to the coupling agent is 10:1, a hydrolysis solution of the coupling agent is dropwise added into the ethanol solution in which the magnetic powder is dispersed, the mixture is heated to 70 ℃ and stirred for 2 hours, the centrifugation is carried out, the mixture is washed by absolute ethyl alcohol and dried, and the magnetic powder coated by the coupling agent is obtained;
step two, adding methyl methacrylate and polymethyl methacrylate with the mass ratio of 2 into a reaction kettle, heating and refluxing at 60 ℃ until the polymethyl methacrylate is completely dissolved into the methyl methacrylate, and obtaining a mixed melt of the polymethyl methacrylate and the methyl methacrylate;
step three, adding the magnetic powder coated by the coupling agent obtained in the step one into the mixed melt left in the step two, stirring for 9 hours to obtain a uniformly mixed magnetic powder mixture, wherein the mass ratio of the methyl methacrylate to the magnetic powder is 5, and transferring the uniformly mixed magnetic powder mixture into a double-screw extruder;
step four, adding the second color master batch from a feed inlet of the double-screw extruder in the step four, mixing the second color master batch with the magnetic powder mixture, extruding the second color master batch and the magnetic powder mixture by the screw extruder, and granulating;
step five, stirring the particles obtained in the step four at 65 ℃, adding 0.1% of initiator when the particles become fluid, continuously stirring for 1 hour at 85 ℃, and cooling to room temperature to obtain a prepolymer dispersed with magnetic powder;
step six, extruding the prepolymer obtained in the step five through a screw of an injection molding machine and injecting the prepolymer into a second injection mold, wherein the second injection mold is a spherical injection mold, the second injection mold is heated to 60 ℃ for low-temperature polymerization, the polymerization time is 9 hours, the injection mold is continuously heated to 110 ℃, and the temperature is kept for 2 hours for aging treatment;
and seventhly, naturally cooling the injection mold to room temperature, opening the injection mold, and demolding to obtain the atomic magnetic ball model.
And adding permanent magnet type magnetic powder into the magnetic ball model, and then performing injection molding, wherein the molded magnetic ball model is used as an atomic model and is combined with the key stick model together to form a molecular model. The magnetic ball model is further dyed by adding color master batches to express different types of atoms, for example, the magnetic ball model added with the black color master batch is used for expressing carbon atoms, the magnetic ball model added with the white color master batch is used for expressing hydrogen atoms, the magnetic ball model added with the red color master batch is used for expressing oxygen atoms, and the nitrogen atoms are expressed by the magnetic ball model added with the blue color master batch. When the magnetic linkage connection device is used, the molecular frameworks are sequentially connected, the frameworks are assembled in the order of atoms, the key stick models and the atoms, then the branched chains outside the frameworks are connected, the magnetic ball models are held by one hand during connection, the end parts of the key stick models are adsorbed on the surfaces of the magnetic ball models through the suckers 7 by the other hand, the connection points of the key stick models and the magnetic ball models are selected according to the distribution of molecular bonds, then the rotating ring 102 of the key stick models is rotated, the iron blocks 3 connected with the key stick models are also adsorbed on the surfaces of the magnetic ball models, and the key stick models are prevented from sliding or falling off on the surfaces of the magnetic ball models.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of preparing a model for simulating molecules, comprising a magnetic sphere model simulating atoms in a molecule and a bond stick model connected between the atoms, characterized by: the method comprises the following specific steps:
step one, dispersing a coupling agent and magnetic powder in a water and ethanol solution under mechanical stirring, dropwise adding a hydrolysis solution of the coupling agent into the ethanol solution in which the magnetic powder is dispersed, heating to 60-70 ℃, stirring for 2 hours, centrifuging, cleaning with absolute ethanol, and drying to obtain magnetic powder coated with the coupling agent;
step two, adding methyl methacrylate and polymethyl methacrylate into a reaction kettle, heating and refluxing at 60 ℃ until the polymethyl methacrylate is completely dissolved into the methyl methacrylate, and obtaining a mixed melt of the polymethyl methacrylate and the methyl methacrylate;
step three, adding 0.05-0.1% of initiator into part of the mixed melt in the step two, stirring, mixing the taken mixed melt with the first-color master batch in a double-screw extruder, extruding, injecting into a first injection mold through an injection device, wherein the first injection mold is a rod-shaped injection mold of a key rod model, heating the first injection mold to 50-60 ℃, polymerizing at a low temperature for 6-9 h, continuously heating the injection mold to 100-110 ℃, preserving heat for 2h, carrying out aging treatment, cooling, and demolding to obtain the key rod model;
step four, adding the magnetic powder coated with the coupling agent obtained in the step one into the mixed melt remaining in the step two, stirring for 5-9 hours to obtain a uniformly mixed magnetic powder mixture, and transferring the uniformly mixed magnetic powder mixture into a double-screw extruder;
step five, adding the second color master batch from a feed inlet of the double-screw extruder in the step four, mixing the second color master batch with the magnetic powder mixture, extruding the second color master batch and the magnetic powder mixture by the screw extruder, and granulating;
step six, stirring the particles obtained in the step five at 55-65 ℃, adding 0.05-0.1% of initiator when the particles become fluid, continuously stirring for 0.5-1 h at 75-85 ℃, and cooling to room temperature to obtain a prepolymer dispersed with magnetic powder;
step seven, extruding the prepolymer obtained in the step six through a screw of an injection molding machine and injecting the prepolymer into a second injection mold, wherein the second injection mold is a spherical injection mold, the second injection mold is heated to 50-60 ℃ for low-temperature polymerization, the polymerization time is 6-9 hours, the injection mold is continuously heated to 100-110 ℃, and the temperature is kept for 2 hours for aging treatment;
and step eight, naturally cooling the injection mold to room temperature, opening the injection mold, and demolding to obtain the atomic magnetic ball model.
2. A method of preparing a model for a mimetic molecule according to claim 1, wherein: in the first step, the mass concentration of the magnetic powder ethanol solution is 15g/L, the magnetic powder is subjected to ultrasonic dispersion in the ethanol solution, the mass concentration of the coupling agent water solution is 0.3g/mL, and the mass ratio of the magnetic powder to the coupling agent is 1-10.
3. A method of preparing a model for a mimetic molecule according to claim 1, wherein: the magnetic powder is Nd2Fe14And B, magnetic powder, wherein the coupling agent is a silane coupling agent.
4. A method of preparing a model for a mimetic molecule according to claim 1, wherein: the mass ratio of the methyl methacrylate to the polymethyl methacrylate in the second step is 0.5-2, and the mass ratio of the methyl methacrylate to the magnetic powder in the fourth step is 1-5.
5. A method of preparing a model for a mimetic molecule according to claim 1, wherein: the first color master batch is white master batch, the second color master batch also comprises a plurality of color master batches, and the second color master batch added into the double-screw extruder in the fifth step is one or more of the plurality of color master batches.
6. A method of preparing a model for a mimetic molecule according to claim 1, wherein: the stirring is non-magnetic stirring.
7. A method of preparing a model for a mimetic molecule according to claim 1, wherein: the key stick model is also connected with two iron blocks.
8. A method of preparing a model for a mimetic molecule according to claim 1, wherein: the key stick model comprises a rotary stick and connecting sticks arranged at two ends of the rotary stick, the rotary stick comprises a threaded column and a rotary ring sleeved on the threaded column, the rotary ring is arranged in the middle of the threaded column, the directions of threads on the threaded columns at two sides of the rotary ring are opposite, two ends of the threaded column are respectively connected with an iron block, and the threaded column is connected to the connecting sticks through threads at two sides of the rotary ring; the connecting rods are provided with inner channels through which the iron blocks can pass, one ends of the two connecting rods are provided with inner threads matched with the outer threads of the threaded columns, the two connecting rods are further connected to the two sides of the rotating ring through the inner threads respectively, the other ends of the connecting rods are far away from the direction of the rotating ring, and the other ends of the connecting rods are further connected with the suckers; the sucking disc includes sucking disc casing and sucking disc groove, the sucking disc casing is transparent circular cone casing, and the top of sucking disc casing still is equipped with the sucking disc groove that supplies the iron plate to place, the sucking disc groove with still be equipped with one or more through-hole between the sucking disc casing.
9. A method of preparing a model for a mimetic molecule according to claim 8, wherein: the side wall of the connecting rod is also provided with air holes.
10. A method of preparing a model for a mimetic molecule according to claim 8, wherein: the both ends of screw thread post still are equipped with the screw hole respectively, and the outer wall of iron plate is equipped with the external screw thread with screw hole assorted, the iron plate pass through the screw hole connect in the screw thread post.
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| GB201206061D0 (en) * | 2011-04-05 | 2012-05-16 | Tracesa Ltd | Fluid identification system and production and use thereof |
| CN202434108U (en) * | 2011-12-28 | 2012-09-12 | 合肥科尚医药科技有限公司 | Chemical model of 4-((3-methylene pyridine)-amino)-6-methyl-4, 5-dihydro-2H-(1, 2, 4) triazole-3-ketone |
| CN105096714A (en) * | 2014-05-07 | 2015-11-25 | 林劲松 | Chemical model |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB201206061D0 (en) * | 2011-04-05 | 2012-05-16 | Tracesa Ltd | Fluid identification system and production and use thereof |
| CN202434108U (en) * | 2011-12-28 | 2012-09-12 | 合肥科尚医药科技有限公司 | Chemical model of 4-((3-methylene pyridine)-amino)-6-methyl-4, 5-dihydro-2H-(1, 2, 4) triazole-3-ketone |
| CN105096714A (en) * | 2014-05-07 | 2015-11-25 | 林劲松 | Chemical model |
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