Superfine organic powder as well as preparation device, preparation method and application thereof

Abstract

The invention provides superfine organic powder as well as a preparation device, a preparation method and application thereof, and relates to the technical field of organic powder preparation. The superfine organic powder is prepared by curing raw materials, and the raw materials comprise curing resin and / or curing monomers; wherein the curing mode comprises at least one of microwave curing, laser curing or EB curing. Through detection and verification, not only can the super-hard and super-tough spherical organic powder be prepared, but also the flexible organic powder with a fluffy feeling and the organic powder with various colors can be prepared, and the organic powder has the characteristics of excellent transparency, weather resistance and the like.

Description

[0001] The present invention claims priority of Chinese patent application No. 202411917556.7, entitled "Ultrafine organic powder and its preparation device and preparation method", and the contents of the description and claims of the priority document are fully incorporated into the description of the present invention and are regarded as part of the original description of the present invention. Technical Field

[0002] The present invention relates to the technical field of organic powder preparation, in particular to an ultrafine organic powder and a preparation device, a preparation method and an application thereof. Background Art

[0003] Currently, the powders on the market are primarily inorganic powders, such as talc, calcium carbonate, and silica powder. However, inorganic powders have poor transparency, a rough feel, and cannot be added in large quantities due to the thickening effect caused by high oil absorption. Therefore, they cannot meet the growing market demand.

[0004] To meet the transparency, scratch resistance, and tactile properties required by industries like engineering plastics, plastic films, high-end coatings, and inks, organic wax powders such as PP and PE have emerged on the market. However, the transparency and wear resistance of PP and PE wax powders fall short of market demand. Furthermore, research is underway to synthesize organic powders such as organosilicon micropowders and velvet powders using emulsion methods. However, these organic powders have limited color options, complex production processes, and face significant environmental pressures in wastewater treatment.

[0005] Therefore, it is necessary and urgent to research and develop a new method for preparing organic powders, which can prepare spherical powders with excellent weather resistance, scratch resistance and wear resistance required by the market, and to meet the market demand for both ultra-hard and ultra-tough organic powders and soft elastic powders.

[0006] In view of this, the present invention is proposed. Summary of the Invention

[0007] The first object of the present invention is to provide an ultrafine organic powder, which not only has good weather resistance, hardness and transparency, but also has excellent scratch resistance, outstanding solvent resistance, high filling property and excellent hand feel.

[0008] The second object of the present invention is to provide a device for preparing ultrafine organic powder.

[0009] The third object of the present invention is to provide a device for preparing ultrafine organic powder.

[0010] A fourth object of the present invention is to provide an application of ultrafine organic powder.

[0011] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are adopted: A first aspect of the present invention provides an ultrafine organic powder, which is prepared by curing raw materials, the raw materials including curing resin and / or curing monomer; wherein the curing method includes at least one of microwave curing, laser curing or EB curing.

[0012] In the above technical solution, the ultrafine organic powder obtained by direct curing not only has better weather resistance, hardness and transparency, but also has excellent scratch resistance, outstanding solvent resistance, high filling property and excellent hand feel.

[0013] In some embodiments, the ultrafine organic powder is prepared by EB curing of raw materials; wherein the curing resin is an EB resin capable of EB curing, and the curing monomer is an EB monomer capable of EB curing. Preferably, the particle size of the ultrafine organic powder is 0.1 to 500 μm. More preferably, the particle size of the ultrafine organic powder is 1 to 200 μm.

[0014] Preferably, EB curing includes: curing the raw material using an EB electron beam curtain or a scanning electron beam.

[0015] A second aspect of the present invention provides an ultrafine organic powder, which is prepared by curing raw materials with an EB electron beam curtain. The raw materials include EB resin and EB monomer. The ultrafine organic powder is a solid organic powder with a particle size of 1 to 200 μm.

[0016] It is understandable that the EB resin and EB monomer used may be different according to the requirements for preparing powders with different properties, and may be a mixture of one or more EB resins and EB monomers.

[0017] In some embodiments, the EB resin includes UV acrylic resin, UV epoxy acrylic resin, UV polyester resin, UV prepolymer resin, EB epoxy resin, and other resins that can be EB-cured.

[0018] In some embodiments, the EB monomer includes a monofunctional and / or polyfunctional unsaturated monomer. For example, the EB monomer includes tripropylene glycol diacrylate, dipentaerythritol hexaacrylate, hexanediol diacrylate, neopentyl glycol diacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, isobornyl methacrylate, n-butyl methacrylate, and other monofunctional or polyfunctional unsaturated monomers.

[0019] In some embodiments, the raw material of the ultrafine organic powder further includes a modifying additive, and the modifying additive includes at least one of a filler, a leveling agent, a defoaming agent, a colorant, silica sol, an organic wax powder, or a dispersant.

[0020] A third aspect of the present invention provides an apparatus for preparing the aforementioned ultrafine organic powder, comprising a raw material storage tank, a high-pressure nitrogen atomizing curtain nozzle, and an EB electron beam curtain generator. The raw material storage tank is connected to a pipeline of the high-pressure nitrogen atomizing curtain nozzle, and the high-pressure nitrogen atomizing curtain nozzle sprays directly above the EB electron beam curtain generated by the EB electron beam curtain generator. The raw material storage tank is used to store the raw material for the ultrafine organic powder and transport the raw material to the high-pressure nitrogen atomizing curtain nozzle, which is used to atomize the raw material into a droplet mist. The EB electron beam curtain generator is used to generate the EB electron beam curtain to solidify the droplet mist to form the ultrafine organic powder.

[0021] In the above technical solution, the various components in the above ultrafine organic powder preparation device cooperate with each other to achieve the rapid preparation of ultrafine organic powder with a solid spherical structure.

[0022] In some embodiments, a flow pump is provided on the connecting pipe between the raw material storage tank and the high-pressure nitrogen atomizing curtain nozzle.

[0023] In some embodiments, the preparation device further includes a powder collecting device.

[0024] In some embodiments, the powder collection device includes a rectangular horn collection port located below the EB electron beam curtain generator, a powder collector, and a packaging machine. The rectangular horn collection port is connected to a powder collector pipe, and the packaging machine is located at the discharge port of the powder collector.

[0025] In some embodiments, the powder collector is provided with an induced draft fan.

[0026] A fourth aspect of the present invention provides a method for preparing the ultrafine organic powder, which is prepared using the above-mentioned preparation device.

[0027] In the above technical solution, the preparation method using the above preparation device combined with EB curing has the advantages of simple and efficient preparation process and is suitable for factory production.

[0028] In some embodiments, the preparation method includes: placing the raw material of ultrafine organic powder in a raw material storage tank, transporting it to a high-pressure nitrogen atomizing curtain nozzle via a pipeline, and atomizing it into droplet mist through the high-pressure nitrogen atomizing curtain nozzle, and the droplet mist is solidified by irradiating the EB electron beam curtain generated by an EB electron beam curtain generator.

[0029] In some embodiments, the droplet mist is one of curtain mist, fan mist, cone mist, or column mist.

[0030] In some embodiments, the high-pressure nitrogen atomizing curtain nozzle has a first channel located inside and a second channel located outside, the first channel is connected to the raw material storage tank, and the second channel is connected to a pipeline providing high-pressure nitrogen.

[0031] The atomization process includes: transporting the raw materials of ultrafine organic powder from the raw material storage tank through the pipeline to the first channel; at the outlet position of the high-pressure nitrogen atomization curtain nozzle, the high-pressure nitrogen blown out from the second channel breaks up the raw materials discharged from the first channel into mist, forming a droplet curtain mist.

[0032] In some embodiments, the electron beam emission direction of the EB electron beam curtain generator is perpendicular to the spray direction of the high-pressure nitrogen atomization curtain nozzle.

[0033] In some embodiments, the electron beam emission direction of the EB electron beam curtain generator forms an acute angle with the spray direction of the high-pressure nitrogen atomizing curtain nozzle. Two or more EB electron beam curtain generators are staggered in different directions of the droplet mist to form EB electron beam curtains from different directions to irradiate the droplet mist.

[0034] In some embodiments, the preparation method includes: mixing EB resin and EB monomer and placing them in a raw material storage tank, turning on the induced draft fan, EB electron beam curtain generator, and high-pressure nitrogen and flow pump; the mixture of EB resin and EB monomer is quantitatively transported to the high-pressure nitrogen atomizing curtain nozzle through the flow pump, and under the action of high-pressure nitrogen, it is atomized into ultra-fine droplet curtain mist through the high-pressure nitrogen atomizing curtain nozzle, and the ultra-fine droplet curtain mist is quickly solidified into spherical organic powder when passing through the EB electron beam curtain generated by the EB electron beam curtain generator.

[0035] A fifth aspect of the present invention provides the use of the ultrafine organic powder in the preparation of engineering plastics, rubber, plastic films, electronic products, cosmetics, coatings and inks. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A schematic structural diagram of an apparatus for preparing ultrafine organic powders according to one embodiment of the present invention; Figure 2 for Figure 1 A top view of the EB curing area in the preparation device; Figure 3 for Figure 1 A schematic structural diagram of a high-pressure nitrogen atomizing curtain nozzle in a preparation device; Figure 4This is a front view schematic diagram of an EB electron beam curtain generator and a high-pressure nitrogen atomization curtain nozzle in one embodiment of the present invention; Figure 5 This is a front view schematic diagram of an EB electron beam curtain generator and a high-pressure nitrogen atomization curtain nozzle in another embodiment of the present invention; Figure 6 for Figure 5 Schematic diagram of the overhead view of the EB electron beam curtain generator and the high-pressure nitrogen atomization curtain nozzle.

[0038] Icons: 1-Raw material storage tank; 2-Flow pump; 3-High-pressure nitrogen atomizing curtain nozzle; 31-First channel; 32-Second channel; 4-EB electron beam curtain generator; 5-Rectangular horn collection port; 6-Powder collector; 7-Induced draft fan; 8-Packaging machine. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] The present invention provides an ultrafine organic powder, which is prepared by curing raw materials, wherein the raw materials include curing resin and / or curing monomer; wherein the curing method includes at least one of microwave curing, laser curing or EB curing.

[0041] It is understandable that the present invention may adopt one of the above curing methods, or may adopt a combination of two or more curing methods, for example, EB curing may be used for the first curing and microwave curing may be used for the second curing.

[0042] In this article, "microwave curing" refers to a curing process that uses microwaves as an energy source. The material absorbs the microwave energy and converts it into heat, which in turn triggers polymerization and crosslinking reactions in the curing monomer and / or curing resin, ultimately forming a three-dimensional network structure. The corresponding curing resin is a microwave-curable resin, and the curing monomer is a microwave-curable monomer. When microwave curing is used, an initiator or curing agent may also be added to the raw material system of the mixture.

[0043] In this article, "laser curing" refers to the curing process that uses laser as an energy source to activate light-sensitive components (such as photoinitiators) in the resin or monomer system through laser energy, triggering polymerization and cross-linking reactions between molecules, and rapidly converting the material from liquid to solid (forming a three-dimensional network structure).

[0044] In this article, "EB curing" refers to electron beam curing, a technique that uses electron beam irradiation to induce cross-linking and rapid curing of materials. The corresponding curing resin used is an EB resin that can be EB-cured, and the curing monomer is an EB monomer that can be EB-cured.

[0045] It is understood that the present invention does not impose any specific limitations on the types of curing monomers and curing resins. For example, the curing resin may be an epoxy resin, an acrylated polyurethane, an acrylated epoxy resin, or the like; and the curing monomer may be an ethylenically unsaturated compound (e.g., an acrylate, a methacrylate, or the like), an isocyanurate derivative, or an isocyanate derivative having at least one pendant acrylate group.

[0046] In some preferred embodiments, the ultrafine organic powder is prepared by EB curing of raw materials; wherein the curing resin is an EB resin capable of EB curing, and the curing monomer is an EB monomer capable of EB curing.

[0047] Preferably, the particle size of the ultrafine organic powder is 0.1 to 500 μm. More preferably, the particle size of the ultrafine organic powder is 1 to 200 μm. By way of example, the particle size of the ultrafine organic powder is 0.1 μm, 1 μm, 4 μm, 5 μm, 10 μm, 20 μm, 50 μm, 100 μm, 200 μm, 500 μm, or any intermediate value between any two of the above values.

[0048] Preferably, EB curing includes: curing the raw material using an EB electron beam curtain or a scanning electron beam.

[0049] In this article, EB electron beam curtain and scanning electron beam are two different energy application methods of EB electron beam.

[0050] Among them, the "EB electron beam curtain" is a curtain-shaped uniform electron beam generated by the EB electron beam curtain generator under high-voltage electric field acceleration (<300 keV). It usually has a fixed width, can cover the surface of the material to be treated, penetrate the surface of the material (up to 1mm), and through ionization and excitation, the EB monomer / EB resin in the resin produces active free radicals, initiating a cross-linking reaction (no initiator is required).

[0051] Scanning electron beam technology uses a scanning electron beam device to accelerate the material at high voltage (energy range of 0.1-10 MeV). The electron beam's path is controlled through electromagnetic deflection or mechanical movement, allowing it to scan the surface of a material point by point, line by line, or surface by surface. Curing or material modification can be achieved through localized heating or by directly inducing chemical reactions (such as free radical polymerization).

[0052] In some embodiments, the ultrafine organic powder is prepared by curing raw materials using an EB electron beam curtain, wherein the raw materials include an EB resin and an EB monomer. The ultrafine organic powder is a solid organic powder with a particle size of 1 to 200 μm.

[0053] Furthermore, the particle size of the ultrafine organic powder is 1-30 μm. For example, the particle size of the ultrafine organic powder is 1 μm, 4 μm, 5 μm, 10 μm, 20 μm, 30 μm, 50 μm, 100 μm, 200 μm, or an intermediate value between any two of the above values.

[0054] The present invention also provides an ultrafine organic powder, which is primarily prepared by curing EB resin and EB monomer using an EB electron beam curtain. The ultrafine organic powder is a solid organic powder with a particle size of 1 to 200 μm. Testing has shown that the ultrafine organic spherical powder provided by the present invention not only exhibits excellent weather resistance, hardness, and transparency, but also exhibits superior scratch resistance, outstanding solvent resistance, high filling properties, and an excellent hand feel.

[0055] In some embodiments, the raw materials of the ultrafine organic powder are EB resin and EB monomer. The EB resin and EB monomer used vary depending on the requirements for preparing powders with different properties, and can be a mixture of one or more of the EB resins and EB monomers.

[0056] Furthermore, the EB resin includes UV acrylic resin, UV epoxy acrylic resin, UV polyester resin, UV prepolymer resin, EB epoxy resin and other resins that can be EB-cured.

[0057] Furthermore, the EB monomer includes monofunctional and / or multifunctional unsaturated monomers. For example, the EB monomer includes tripropylene glycol diacrylate, dipentaerythritol hexaacrylate, hexanediol diacrylate, neopentyl glycol diacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, isobornyl methacrylate, n-butyl methacrylate, and other monofunctional or multifunctional unsaturated monomers.

[0058] In some embodiments, the raw material of the ultrafine organic powder further includes a modifying additive, and the modifying additive includes at least one of a filler, a leveling agent, a defoaming agent, a colorant, silica sol, an organic wax powder, or a dispersant.

[0059] Further, fillers include wood pulp, vermiculite and combinations thereof, metal carbonates (such as calcium carbonate, i.e. chalk, calcite, marl, travertine, marble and limestone, calcium magnesium carbonate, sodium carbonate, magnesium carbonate), silica (such as amorphous silica, quartz, glass beads, glass powder, glass bubbles and glass fibers), silicates (such as talc, clay (montmorillonite), feldspar, mica, calcium silicate, calcium metasilicate, sodium aluminosilicate, sodium silicate), metal sulfates (such as calcium sulfate, barium sulfate, sodium sulfate, sodium aluminum sulfate, aluminum sulfate), gypsum, vermiculite, wood flour, aluminum trihydrate, metal oxides (such as calcium oxide (lime), aluminum oxide, titanium dioxide) and metal sulfites (such as calcium sulfite).

[0060] Furthermore, the leveling agent may include silicone leveling agents (such as BYK-333), acrylate leveling agents (such as BYK-358N), fluorine leveling agents (such as fluoropolyethers), and other reactive leveling agents.

[0061] Furthermore, defoaming agents may include silicones (such as BYK-066N), powder defoaming agents (such as FoamStar® PB 2941, FoamStar® PB2922, etc.), mineral oils, polyethers, etc.

[0062] Furthermore, the colorant may include an organic colorant or an inorganic colorant, and may be a color paste or a color powder. For example, the inorganic colorant may include carbon black, titanium dioxide, zinc sulfide, iron oxide, chromium oxide, nickel oxide, chromium oxide, antimony oxide, titanium oxide, cobalt oxide, and bismuth vanadate; the organic colorant may include azo, phthalocyanine, or polycyclic colorants, such as phthalocyanine, triphenylmethane, anthraquinone (cyan / blue), monoazo / disazo composites (magenta / red), lemon yellow (yellow), disazo / polyazo composites, or azo / metal complex composites.

[0063] Furthermore, the silica sol may be silica sol; the organic wax powder may be PP wax powder, PE wax powder, etc.; the surfactant may be a cationic surfactant, such as cetyltrimethylammonium bromide (CTAB), etc., or a nonionic surfactant, such as fatty alcohol polyoxyethylene ether; or some specific silane coupling agents or polyvinyl pyrrolidone, etc.

[0064] Furthermore, the dispersant may include anionic surfactants, such as sodium dodecylbenzenesulfonate (SDBS), sodium diethyl succinate sulfonate, etc., or nonionic surfactants, such as polyoxyethylene octylphenol ether (OP-10), polyoxyethylene sorbitan esters (Tween series), etc.; it may also include polycarboxylate dispersants (such as BYK-110, EFKA-4046, etc.), polyurethane dispersants, etc.

[0065] The present invention also provides a device for preparing the ultrafine organic powder. Figure 1 This is a schematic diagram of the structure of the device for preparing ultrafine organic powder provided by one embodiment of the present invention, see Figure 1 The preparation device includes: a raw material storage tank 1, a high-pressure nitrogen atomizing curtain nozzle 3 and an EB electron beam curtain generator 4, wherein the raw material storage tank 1 is connected to the high-pressure nitrogen atomizing curtain nozzle 3 through a pipeline. The raw material storage tank 1 is used to place the raw material to be solidified and transport the raw material to the high-pressure nitrogen atomizing curtain nozzle 3 through a pipeline. The high-pressure nitrogen atomizing curtain nozzle 3 is used to atomize the raw material to form a droplet mist.

[0066] Figure 2 for Figure 1 Top view of the EB curing area in the preparation device, see Figure 2 The spray direction of the high-pressure nitrogen atomizing curtain nozzle 3 is set to be directly above the EB electron beam curtain generated by the EB electron beam curtain generator 4, and is used to solidify the droplet mist sprayed by the high-pressure nitrogen atomizing curtain nozzle 3 through irradiation of the EB electron beam curtain to form ultrafine organic powder.

[0067] In some embodiments, a flow pump 2 is provided on the communication pipe between the raw material storage tank 1 and the high-pressure nitrogen atomizing curtain nozzle 3 .

[0068] As a preferred embodiment, the flow pump 2 is arranged on the connecting pipe between the raw material storage tank 1 and the high-pressure nitrogen atomizing curtain nozzle 3, and is used to control the material to be transported to the high-pressure nitrogen atomizing curtain nozzle 3 for atomization to form droplet mist.

[0069] In this article, a "high-pressure nitrogen atomizing curtain printhead" refers to a device that uses high-pressure nitrogen to atomize liquid, creating a curtain-like spray effect. Liquid to be atomized is introduced into the printhead, where it encounters the high-velocity, high-pressure nitrogen gas. The shear, impact, and friction of the high-speed nitrogen gas disperse the liquid into tiny droplets, achieving the atomization effect.

[0070] In some embodiments, the structure of the high-pressure nitrogen atomizing curtain nozzle 3 is as follows: Figure 3 As shown, the nozzle has a first channel 31 located on the inside and a second channel 32 located on the outside. That is, the second channel 32 surrounds the first channel 31. The first channel 31 is connected to the raw material storage tank 1 via a connecting pipe, while the second channel 32 is connected to a pipeline supplying high-pressure nitrogen. At the outlet of the high-pressure nitrogen atomizing curtain nozzle 3, the nitrogen gas blown from the second channel 32 can disperse the raw material discharged from the first channel 31 into a mist, forming a droplet mist.

[0071] Furthermore, by using different types of high-pressure nitrogen atomizing curtain nozzles 3, the atomized raw material can be formed into different shapes. For example, a thin curtain mist can be formed to facilitate the EB electron beam curtain to pass through the curtain mist for solidification; fan-shaped mist, cone-shaped mist, or cylindrical mist can also be formed.

[0072] As a preferred embodiment, the EB electron beam curtain generator 4 includes an electron beam supply unit, a steering unit, and multiple electron beam emission units. The electron beam supply unit is used to emit an electron beam, and the steering unit can provide a magnetic field to deflect the electron beam emitted by the electron beam supply unit under the action of the magnetic field, and then move to different electron beam emission units. The electron beam is then emitted from the electron beam emission unit to achieve the curing of the raw material to be cured. Among them, multiple electron beam emission units can emit electron beams at the same time, thereby achieving simultaneous irradiation from multiple directions of the atomized raw material to better cure the raw material, which can be suitable for application scenarios where conical mist is sprayed.

[0073] As a preferred embodiment, the emission direction of the electron beam in the EB electron beam curtain generator 4 is perpendicular to the spray direction of the raw material from the high-pressure nitrogen atomization curtain nozzle 3.

[0074] In another embodiment, the direction of the electron beam emitted from the EB electron beam curtain generator 4 and the direction of the raw material sprayed from the high-pressure nitrogen atomizing curtain nozzle 3 may also be non-perpendicular. Figure 4 In the illustrated embodiment, the emission direction of the electron beam (the direction indicated by the arrow A in the figure) forms an acute angle with the spray direction of the high-pressure nitrogen atomizing curtain nozzle 3 (the direction indicated by the arrow B in the figure).

[0075] As a preferred embodiment, the preparation device includes two or more EB electron beam curtain generators 4, and the multiple EB electron beam curtain generators 4 are staggered.

[0076] Further, in Figure 4 In the illustrated embodiment, the high-pressure nitrogen atomizing curtain nozzle 3 sprays a thick cone-shaped mist. By arranging EB electron beam curtain generators 4 on both sides of the cone to emit electron beams to irradiate the cone-shaped mist, the atomized raw material can be more effectively solidified. Furthermore, because the electron beam emission direction is not perpendicular to the spray direction of the high-pressure nitrogen atomizing curtain nozzle 3, the electron beams emitted by the EB electron beam curtain generator 4 on one side and the EB electron beam curtain generator 4 on the other side do not move in opposite directions, thereby affecting the electron beam trajectory. The electron beams can penetrate deeper into the cone-shaped mist, solidifying more droplets in the cone-shaped mist and reducing raw material waste.

[0077] See Figure 5 and Figure 6In another embodiment, multiple EB electron beam curtain generators 4 are staggered, emitting electron beams from different directions to more fully solidify the cone-shaped mist. That is, EB electron beam curtain generators 4 are positioned on multiple sides of the cone-shaped mist, and each EB electron beam curtain generator 4 is positioned at varying distances from the high-pressure nitrogen atomizing curtain nozzle 3. In this embodiment, droplets on one side of the cone-shaped mist are solidified first by passing through one EB electron beam curtain generator 4, and then by passing through the other side of the EB electron beam curtain generator 4, thereby solidifying more droplets in the cone-shaped mist.

[0078] In some embodiments, the preparation device further includes a powder collecting device.

[0079] In the above-mentioned preferred embodiment, the powder collection device includes a rectangular horn collecting port 5 arranged below the EB electron beam curtain generator 4, a powder collector 6 and a packaging machine 8, wherein the rectangular horn collecting port 5 is connected to the powder collector 6 by a pipe, and the pipe used for connection can be a pipe with a rectangular or circular cross-section; the packaging machine 8 is arranged at the discharge port of the powder collector 6.

[0080] As a preferred embodiment, the bottom of the powder collector 6 is connected to a packaging machine 8, which is used to package the organic powder collected by the collector.

[0081] As a preferred embodiment, the size of the rectangular horn collecting port 5 is set according to needs, and the rectangular horn collecting port 5 is connected to the powder collector 6 through a pipeline.

[0082] In the above preferred embodiment, the powder collector 6 is provided with an induced draft fan 7 .

[0083] As a preferred embodiment, the EB electron beam curtain generator 4 can also be arranged on the pipeline connected to the powder collector 6. The atomized raw material moves along the pipeline to the position of the EB electron beam curtain generator 4 under the action of the gravity provided by the induced draft fan 7, and is then irradiated by the EB electron beam curtain emitted by the EB electron beam curtain generator 4 to achieve solidification.

[0084] Furthermore, the pipeline in which the EB electron beam curtain generator 4 is located can be arranged horizontally, vertically, or inclined.

[0085] The present invention also provides a method for preparing the ultrafine organic powder by using the above-mentioned preparation device.

[0086] In some embodiments, the preparation method includes: placing the raw material of the ultrafine organic powder in a raw material storage tank 1, transporting it to a high-pressure nitrogen atomizing curtain nozzle 3 via a pipeline, and atomizing it into a droplet mist through the high-pressure nitrogen atomizing curtain nozzle 3, and the droplet mist is solidified by irradiating the EB electron beam curtain generated by the EB electron beam curtain generator 4.

[0087] In the above preferred embodiment, the preparation method includes: fully mixing the EB resin and the EB monomer and placing them in the raw material storage tank 1, turning on the induced draft fan 7 and the EB electron beam curtain generator 4, turning on the high-pressure nitrogen and the flow pump 2, and quantitatively transporting the mixture of EB resin and EB monomer to the high-pressure nitrogen atomizing curtain nozzle 3 through the flow pump 2. Under the action of the high-pressure nitrogen, the high-pressure nitrogen atomizing curtain nozzle 3 is atomized into ultra-fine droplet curtain mist. When the ultra-fine droplet curtain mist passes through the EB electron beam curtain generated by the EB electron beam curtain generator 4, it is rapidly solidified (0.005-0.1 seconds) into spherical organic powder. The powder is rapidly collected in the powder collector 6 by the gravity provided by the induced draft fan 7 at the rectangular trumpet collecting port 5, and then packaged by the packaging machine 8 to obtain an ultra-fine organic spherical powder product.

[0088] The present invention uses a specific preparation method and preparation device to prepare not only super-hard and super-tough spherical organic powders, but also flexible organic powders with a fuzzy feel, and organic powders of various colors. The organic powders have excellent transparency, weather resistance and other characteristics.

[0089] The present invention also provides the use of the ultrafine organic powder in the preparation of engineering plastics, rubber, plastic films, electronic products, cosmetics, coatings and inks.

[0090] The ultrafine organic powder provided by the present invention can be widely used in the preparation processes of engineering plastics, rubber, plastic films, electronic products, cosmetics, coatings and inks.

[0091] It should be noted that the ultrafine organic powder of the present invention can be used as matte powder in the coating and ink industries. The matte paint made of the solid organic spherical structure has high transparency, high scratch resistance and a baby-like feel, which is completely different from the existing silica micropowder matte powder; it can also be used as an aluminum powder orienting agent in the coating industry. Compared with CAB (cellulose acetate) orienting agents, the organic powder with low oil absorption value is filled in the middle of the aluminum powder as a orienting agent, which has the advantages of high solid content, high fullness and low VOC emissions; when used in car cover plastic film, it can play a matting role, has good UV resistance, and greatly increases the scratch resistance of the car cover.

[0092] The technical solution of the present invention will be further described below with reference to embodiments.

[0093] Example 1 Figure 1This is a schematic diagram of the production equipment structure of ultrafine organic powder provided in this embodiment. Figure 2 This is a top view of the EB curing area of ​​the ultrafine organic powder production equipment provided in this embodiment. Figure 1 As shown, this embodiment provides a device for preparing ultrafine organic powder, including: a raw material storage tank 1, a high-pressure nitrogen atomizing curtain nozzle 3 and an EB electron beam curtain generator 4, wherein: the raw material storage tank 1 is connected to the high-pressure nitrogen atomizing curtain nozzle 3 through a pipeline, and the spray direction of the high-pressure nitrogen atomizing curtain nozzle 3 is set to be directly above the EB electron beam curtain generated by the EB electron beam curtain generator 4.

[0094] In this embodiment, the components of the above-mentioned ultrafine organic powder preparation device cooperate with each other to achieve the preparation of ultrafine organic powder with a solid spherical structure.

[0095] See also Figure 1 A flow pump 2 is provided on the connecting pipe between the raw material storage tank 1 and the high-pressure nitrogen atomizing curtain nozzle 3, which is used to control the material to be transported to the high-pressure nitrogen atomizing curtain nozzle 3 for atomization to form a mist curtain.

[0096] See also Figure 1 、 Figure 2 The preparation apparatus also includes a powder collection device, which comprises a rectangular horn collection port 5 located below the EB electron beam curtain, a powder collector 6, and a packaging machine 8. The rectangular horn collection port 5 is connected to the powder collector 6 via a pipe. The packaging machine 8 is located at the powder outlet of the powder collector 6 and is used to package the ultrafine organic powder collected by the collector. The rectangular horn collection port 5 can be sized as needed and is connected to the powder collector 6 via a pipe.

[0097] See also Figure 1 The powder collector 6 is provided with an induced draft fan 7 for providing the absorption wind force required by the powder collector 6 .

[0098] The working process of the ultrafine organic powder preparation device in this embodiment is as follows: After the EB resin and EB monomer are fully mixed and evenly mixed, they are placed in a raw material storage tank 1. The induced draft fan 7 and the EB electron beam curtain generator 4 are turned on, and the high-pressure nitrogen and the flow pump 2 are turned on. The mixture of resin and monomer is quantitatively transported to the high-pressure nitrogen atomizing curtain nozzle 3 through the flow pump 2. Under the action of the high-pressure nitrogen, the high-pressure nitrogen atomizing curtain nozzle 3 is atomized into ultra-fine droplet curtain mist. The ultra-fine droplet curtain mist is rapidly solidified (0.005-0.1 seconds) into spherical organic powder when passing through the EB electron beam curtain generated by the EB electron beam curtain generator 4. The powder is quickly collected in the powder collector 6 at the rectangular trumpet collecting port 5 by the gravity provided by the induced draft fan 7. The organic powder generated by the EB electron beam curing of the EB resin and EB monomer is an ultra-fine organic spherical powder, which is then packaged by the packaging machine 8 to obtain an ultra-fine organic spherical powder product.

[0099] Example 2 The difference between this embodiment and embodiment 1 is that the preparation device of this embodiment is not provided with a raw material storage tank 1 connected before the flow pump 2, and the remaining components and their connections are the same as those in embodiment 1.

[0100] The production equipment of this embodiment may easily cause raw materials to be spilled during production operation, resulting in a waste of resources.

[0101] Example 3 The difference between this embodiment and embodiment 1 is that the nozzle in the preparation device of this embodiment is not of curtain type, and the remaining components and their connections are the same as those in embodiment 1. Since the mist is relatively thick, part of the mist cannot be solidified and the performance of the product design cannot be achieved.

[0102] Example 4 This embodiment provides an ultrafine organic powder. The ultrafine organic powder is prepared using the ultrafine organic powder preparation device of Example 1. The preparation method includes the following steps: UV acrylic resin, trimethylol triacrylate (TMPTA), and n-butyl methacrylate are thoroughly mixed in a mass ratio of 7:2:1 to obtain raw materials. The raw materials are placed in a raw material storage tank 1. The induced draft fan 7 and EB electron beam curtain generator 4 are turned on. High-pressure nitrogen (3-6 kg) and a flow pump are turned on to quantitatively deliver the raw materials to the high-pressure nitrogen atomizing curtain nozzle 3 at a flow rate of 50 kg per hour. Under the action of the high-pressure nitrogen, the raw materials are atomized by the high-pressure nitrogen atomizing curtain nozzle 3 into a screen mist of ultrafine droplets. Upon passing through the EB electron beam curtain generated by the EB electron beam curtain generator 4, the ultrafine droplet mist is rapidly solidified into spherical organic powder within 0.01 seconds. The powder is rapidly collected at the rectangular trumpet collection port 5 by the gravity provided by the induced draft fan 7 into a powder collector 6. The ultrafine organic spherical powder is then packaged by a packaging machine 8 to obtain the finished ultrafine organic spherical powder. The particle size of the ultrafine organic spherical powder is 5-10 μm.

[0103] The ultrafine organic powder obtained in this embodiment is a solid ultrafine organic powder, which has excellent solvent resistance and chemical resistance, good scratch resistance, and good hand feel.

[0104] Example 5 This embodiment provides an ultrafine organic powder, which differs from embodiment 4 in that this embodiment uses the ultrafine organic powder preparation device of embodiment 2 to prepare the powder, and the remaining steps and process parameters are the same as those of embodiment 4.

[0105] Example 6 This embodiment provides an ultrafine organic powder, which differs from embodiment 4 in that this embodiment uses the ultrafine organic powder preparation device of embodiment 3 to prepare the powder, and the remaining steps and process parameters are the same as those of embodiment 4.

[0106] Test Example 1 In this test example, the ultrafine organic powder prepared in Example 4 above was used to prepare a coating to verify its technical effect. The composition of the coating is as follows:

[0107] Note: In the above table, "parts" are parts by mass; the resin is acrylic resin GNU2450 (Guangzhou Jujia New Materials); the solvent is butyl acetate / xylene / PMA = 5 / 3 / 2; the curing agent is 45% solid content N3390 (Covestro); and the leveling agent is 10% BYK333 (BYK Chemical).

[0108] Performance testing of the coatings prepared in the test and control groups revealed that the test group with the ultrafine organic powder of Example 4 achieved a hardness of 3H, while the control group without the ultrafine organic powder achieved a hardness of 1H. Furthermore, in a wear resistance (RCA) test, the test group with the ultrafine organic powder of Example 4 achieved 150 cycles, while the control group without the ultrafine organic powder achieved only 15 cycles. This demonstrates that the addition of the ultrafine organic powder prepared in this invention significantly improves the hardness and scratch resistance of the coating film, while also reducing the amount of resin solvent and thus VOC emissions.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ultrafine organic powder, characterized in that: The ultrafine organic powder is prepared by curing raw materials, wherein the raw materials include curing resin and / or curing monomer; Wherein, the curing method includes at least one of microwave curing, laser curing or EB curing.

2. The ultrafine organic powder according to claim 1, characterized in that The ultrafine organic powder is prepared by EB curing of raw materials; wherein the curing resin is an EB resin capable of EB curing, and the curing monomer is an EB monomer capable of EB curing; Preferably, the particle size of the ultrafine organic powder is 0.1-500 μm; Preferably, the particle size of the ultrafine organic powder is 1 to 200 μm; Preferably, the EB curing includes: curing the raw material using an EB electron beam curtain or a scanning electron beam.

3. An ultrafine organic powder, characterized in that: The ultrafine organic powder is prepared by curing raw materials through EB electron beam curtain; the raw materials include EB resin and EB monomer; The ultrafine organic powder is a solid organic powder with a particle size of 1 to 200 μm.

4. The ultrafine organic powder according to claim 2 or 3, characterized in that: The raw material of the ultrafine organic powder is a mixture of one or more of EB resin and EB monomer; The EB resin is a resin that can achieve EB curing; The EB monomer is a monofunctional or multifunctional unsaturated monomer; Preferably, the raw material of the ultrafine organic powder further includes a modifying additive, and the modifying additive includes at least one of a filler, a leveling agent, a defoaming agent, a colorant, silica sol, an organic wax powder or a dispersant.

5. The device for preparing ultrafine organic powder according to any one of claims 2 to 4, characterized in that: The preparation device comprises: a raw material storage tank (1), a high-pressure nitrogen atomizing curtain nozzle (3) and an EB electron beam curtain generator (4), wherein the raw material storage tank (1) is connected to the high-pressure nitrogen atomizing curtain nozzle (3) through a pipeline, and the spray direction of the high-pressure nitrogen atomizing curtain nozzle (3) is directly above the EB electron beam curtain generated by the EB electron beam curtain generator (4); The raw material storage tank (1) is used to place the raw material of the ultrafine organic powder and transport it to the high-pressure nitrogen atomizing curtain nozzle (3), the high-pressure nitrogen atomizing curtain nozzle (3) is used to atomize the raw material to form a droplet mist, and the EB electron beam curtain generator (4) is used to generate an EB electron beam curtain to solidify the droplet mist to form the ultrafine organic powder.

6. The device for preparing ultrafine organic powder according to claim 5, characterized in that: A flow pump (2) is provided on the communication pipe between the raw material storage tank (1) and the high-pressure nitrogen atomizing curtain nozzle (3).

7. The device for preparing ultrafine organic powder according to claim 5, characterized in that: The preparation device further includes a powder collecting device; the powder collecting device includes a rectangular horn collecting port (5) arranged below the EB electron beam curtain generator (4), a powder collector (6) and a packaging machine (8), wherein: The rectangular trumpet collecting port (5) is connected to the powder collector (6) via a pipeline; The packaging machine (8) is arranged at the discharge port of the powder collector (6).

8. The device for preparing ultrafine organic powder according to claim 6, characterized in that: The powder collector (6) is provided with an induced draft fan (7).

9. The method for preparing ultrafine organic powder according to any one of claims 2 to 4, characterized in that: The preparation method is based on the ultrafine organic powder preparation device according to any one of claims 5 to 8.

10. The method for preparing ultrafine organic powder according to claim 8, characterized in that: The preparation method comprises: placing the raw material of the ultrafine organic powder in the raw material storage tank (1), transporting it to the high-pressure nitrogen atomizing curtain nozzle (3) via a pipeline, and atomizing it into droplet mist through the high-pressure nitrogen atomizing curtain nozzle (3), and solidifying the droplet mist by irradiating the EB electron beam curtain generated by the EB electron beam curtain generator (4); Optionally, the droplet mist is one of curtain mist, fan-shaped mist, cone-shaped mist or column-shaped mist.

11. The method for preparing ultrafine organic powder according to claim 9, characterized in that: The high-pressure nitrogen atomizing curtain nozzle (3) has a first channel (31) located on the inner side and a second channel (32) located on the outer side, the first channel (31) is connected to the raw material storage tank (1), and the second channel (32) is connected to a pipeline for providing high-pressure nitrogen; The atomization process includes: transporting the raw material of the ultrafine organic powder from the raw material storage tank (1) to the first channel (31) via a pipeline; at the outlet position of the high-pressure nitrogen atomization curtain nozzle (3), the high-pressure nitrogen gas blown out from the second channel (32) breaks up the raw material sprayed from the first channel (31) into a mist, thereby forming the droplet mist.

12. The method for preparing ultrafine organic powder according to claim 9, characterized in that: The electron beam emission direction of the EB electron beam curtain generator (4) is perpendicular to the spray direction of the high-pressure nitrogen atomizing curtain nozzle (3).

13. The method for preparing ultrafine organic powder according to claim 9, characterized in that: An acute angle is formed between the electron beam emission direction of the EB electron beam curtain generator (4) and the spray direction of the high-pressure nitrogen atomizing curtain nozzle (3); Two or more EB electron beam curtain generators (4) are staggeredly arranged in different directions of the droplet mist to form EB electron beam curtains from different directions to irradiate the droplet mist.

14. The method for preparing ultrafine organic powder according to claim 9, characterized in that: The preparation method comprises: mixing the EB resin and the EB monomer and placing the mixture into the raw material storage tank (1), and starting the induced draft fan (7), the EB electron beam curtain generator (4), the high-pressure nitrogen and the flow pump (2); The mixture of EB resin and EB monomer is quantitatively transported to the high-pressure nitrogen atomizing curtain nozzle (3) through the flow pump (2), and is atomized into ultra-fine droplet curtain mist through the high-pressure nitrogen atomizing curtain nozzle (3) under the action of high-pressure nitrogen. The ultra-fine droplet curtain mist is quickly solidified into spherical organic powder when passing through the EB electron beam curtain generated by the EB electron beam curtain generator (4).

15. Use of the ultrafine organic powder according to any one of claims 1 to 4 in the preparation of engineering plastics, rubber, plastic films, electronic products, cosmetics, coatings and inks.

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