Modified material capable of preventing agglomeration of water-absorbing powder material in long-term storage and preparation process of modified material

Abstract

The invention discloses a modified material capable of being used for a water-absorbing powder material without agglomeration after long-term storage and a preparation process of the modified material. The preparation process comprises the following steps: S1, preparing a modifier, namely preparing the required modifier from a component A, an industrial additive and fumed silica according to a weight part ratio; s2, pretreatment and feeding; s3, synchronous grinding and modification, wherein the premix is put into ultrafine crushing equipment to be processed; s4, under the action of mechanism and mechanical force, the component A in the modifier and fumed silica synchronously complete spreading adsorption and nanometer isolation inlaying on the particle new surface; and S5, collecting and post-processing. According to the invention, the modifier is added to modify the surface of the powder while the particles are crushed, so that the surface modification of the fine oxidant is more uniform, and the particles meeting the particle size requirement are directly used as usable products according to the dispersing performance and the flowing performance of the powder in the grinder; and the problem of mutual adhesion of particles is solved.

Description

Technical Field

[0001] This invention relates to the field of powder technology, and in particular to a modified material that can be used for long-term storage of water-absorbing powder materials without agglomeration and its preparation process. Background Technology

[0002] Some hygroscopic powder materials, as cationic salts, inherently possess strong hygroscopicity. After grinding and dispersing into smaller particles, their specific surface area increases significantly, exhibiting a stronger volume effect and enhanced particle surface energy. Under the influence of various interparticle forces (Coulomb forces and van der Waals forces), especially in high-humidity environments, water absorption and agglomeration occur. Under existing process conditions, these powders, after grinding and dispersing, exhibit slight agglomeration after a one-month storage period. In hot and humid seasons, severe agglomeration often results in particle size growth exceeding the required range, causing filtration blockage, substandard dispersibility, and sedimentation at the bottom of the container, leading to product waste and defective products. Therefore, this solution proposes a modified material and its preparation process for long-term storage of hygroscopic powder materials to prevent agglomeration, thereby addressing the aforementioned problems. Summary of the Invention

[0003] The purpose of this invention is to provide a modified material and its preparation process that can be used for long-term storage of water-absorbing powder materials without agglomeration, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a modified material that can be used for long-term storage of water-absorbing powder materials without agglomeration, wherein the modified material comprises the following raw materials in parts by weight: 99-101 parts of water-absorbing powder and 0.1-1.5 parts of modifier.

[0005] Preferably, the modifier comprises the following raw materials in parts by weight: 0.5-2 parts of component A, 0.1-0.5 parts of process aid and 0.9-1.1 parts of fumed silica.

[0006] Preferably, component A includes a resin, a surfactant, or a dispersant.

[0007] A preparation process for a modified material that can be used for long-term storage of water-absorbing powder materials without agglomeration, comprising the above-mentioned modified material for long-term storage of water-absorbing powder materials without agglomeration, the preparation process comprising the following steps: S1, Modifier preparation: Component A, industrial additives and fumed silica are prepared into the required modifier according to the weight ratio. S2, Pretreatment and feeding: The water-absorbing powder and the modifier prepared in S1 are premixed according to the mass parts, and the modifier is added in the form of dry powder. S3, simultaneous grinding and modification, involves feeding the premixed material into an ultrafine grinding equipment for processing; S4, Mechanism: Under the action of mechanical force, component A in the modifier and fumed silica simultaneously complete the spreading, adsorption and nano-isolation embedding on the newly formed particle surface. S5, Collection and Post-processing: The ground and modified powders are collected using a cyclone collector and a bag filter.

[0008] Preferably, the preparation of the modifier in S1 includes the following steps: S101, Raw material preparation: Use an electronic scale to accurately weigh each type of raw material. S102, Preparation of the mixture: Component A and industrial additives are mixed, and then the mixed raw materials are mixed with fumed silica to obtain a wet mixture; S103, molding, dynamic drying at 50-80℃, processing the wetted mixture obtained in S102 into modifier powder.

[0009] Preferably, the mixing preparation in S102 includes the following steps: S1021, Preparation of mixed solution: Component A and industrial additives are prepared into a mixed solution under stirring. S1022, Mixing of raw materials: Place fumed silica in a high-speed mixer and spray the mixed solution prepared in S1021 onto the outer wall of the fumed silica.

[0010] Preferably, the molding process in S103 includes the following steps: S1031, Drying: The mixed raw materials obtained in S102 are dried using drying equipment; S1032, pulverization and sieving: The dried mixed raw materials are pulverized using a pulverizer, and then the modifier is separated out using a filter screen.

[0011] Preferably, the pretreatment and feeding in step S2 includes the following steps: S201, Pre-treatment of raw materials: Using an electronic scale, the water-absorbing powder and the modifier are weighed precisely respectively. S202, Premixing: The raw materials are put into a container and premixed.

[0012] Preferably, the simultaneous grinding and modification in S3 includes the following steps: S301, raw material crushing: water-absorbing powder and modifier are put into ultrafine crushing equipment, and the water-absorbing powder particles are crushed by mechanical force to produce a new surface with high activity. S302, modification of raw materials: Under the action of collision, friction and shearing, the newly formed surface of water-absorbing powder interacts with the modifier particles in the cavity, and instantly completes adsorption and coating, thereby modifying the surface of the water-absorbing powder.

[0013] Preferably, the collection and post-processing in S5 includes the following steps: S501, Powder conveying: A cyclone collector is used to collect and convey dispersed powder. S502, Powder collection: Bag filters are used to intercept and collect the conveyed powder.

[0014] The technical effects and advantages of this invention are as follows: This invention modifies the surface of powder by adding a modifier during particle crushing. This method results in more uniform surface modification of the fine oxidant. By improving the dispersion and flow properties of the powder within the grinder, particles that meet the required particle size can be directly used as usable product particles, thus solving the problem of particle adhesion. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the preparation process of the present invention. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Example 1: A modified material for preventing agglomeration of water-absorbing powder materials during long-term storage. The modified material comprises the following parts by weight: 99-101 parts of water-absorbing powder and 0.1-1.5 parts of a modifier. The modifier comprises the following parts by weight: 0.5-2 parts of component A, 0.1-0.5 parts of process aids, and 0.9-1.1 parts of fumed silica. Component A includes physicochemical adsorption and provides hydrophobic resin, surfactant, or dispersant, its function being to undergo physicochemical adsorption with the powder surface. It provides hydrophobicity and ensures 100% compatibility with downstream application systems. The process aid is a low-boiling-point solvent or interface modifier. Its function is to promote the spreading and penetration of component A on the powder surface and to completely volatilize during subsequent drying without leaving any residue. The fumed silica (nanocarrier and isolating agent) is a hydrophobic product. Its functions are: first, as a high specific surface area carrier, it loads component A and fumed silica through impregnation to form a solid composite modifier powder, which is convenient for feeding; second, after grinding, it acts as nanoscale physical isolating particles to prevent direct contact between primary particles.

[0018] Example 2: The present invention provides as follows Figure 1 The process for preparing a modified material that can be used for long-term storage of water-absorbing powder materials without agglomeration, as shown above, includes the following steps: S1, Modifier preparation: Component A, industrial additives and fumed silica are prepared into the required modifier according to the weight ratio. The preparation of the modifier in S1 includes the following steps: S101, Raw material preparation: Use an electronic scale to accurately weigh each type of raw material. S102, Preparation of the mixture: Component A and industrial additives are mixed, and then the mixed raw materials are mixed with fumed silica to obtain a wet mixture; S103, molding, dynamic drying at 50-80℃, processing the wet mixture obtained in S102 into modifier powder; The mixing preparation in S102 includes the following steps: S1021, Preparation of mixed solution: Component A and industrial additives are prepared into a mixed solution under stirring. S1022, Mixing of raw materials: Place fumed silica in a high-speed mixer and spray the mixed solution prepared in S1021 onto the outer wall of the fumed silica. The molding process in S103 includes the following steps: S1031, Drying: The mixed raw materials obtained in S102 are dried using drying equipment; S1032, pulverization and sieving: The dried mixed raw materials are pulverized using a pulverizer, and then the modifier is separated out using a filter screen.

[0019] It should be noted that in the raw material preparation stage, accurately weighed component A and industrial additives are first placed in a stirring container. The stirring container consists of a tank and a stirring mechanism, which comprises a motor, a stirring shaft, and stirring blades. The motor is bolted to the tank. When in use, the motor is turned on, driving the stirring shaft to rotate, which in turn drives the stirring blades. After component A and industrial additives are placed inside the tank, the stirring mechanism is turned on. Under continuous stirring, the two components fully dissolve, thus preparing a homogeneous mixed solution. Then, the weighed fumed silica powder is added to a high-speed mixer. Driven by the stirring blades, the powder forms a highly concentrated mixture. In a turbulent fluidized state, the prepared mixed solution is sprayed evenly onto the surface of the moving silica powder in an atomized form through a spraying device. Under high-speed shearing and collision, the droplets instantly spread and coat the outer wall of each silica particle, thus preparing a moist mixture. The obtained moist mixture is transferred to a drying device and dynamically dried at a mild temperature of 50-80℃. This temperature range is designed to effectively remove moisture. The dried material is first gently deagglomerated and pulverized by a pulverizer to restore its powder state, and then screened using a filter screen to remove large particles and impurities that have not been fully pulverized, thereby obtaining the required modifier powder.

[0020] S2, Pretreatment and feeding: The water-absorbing powder and the modifier prepared in S1 are premixed according to the mass parts, and the modifier is added in the form of dry powder. The pretreatment and feeding process in S2 includes the following steps: S201, Pre-treatment of raw materials: Using an electronic scale, the water-absorbing powder and the modifier are weighed precisely respectively. S202, Premixing: The raw materials are put into a container and premixed.

[0021] It should be noted that an electronic scale is used to independently and accurately weigh the water-absorbing powder and the modifier, ensuring that the ratio between the water-absorbing powder and the modifier conforms to the aforementioned weight proportions. This precise ratio directly determines the water absorption, strength, and uniformity of the final composite material. The precisely weighed water-absorbing powder and modifier are then added together into a mixing device, which consists of a tank and a stirring mechanism. The stirring mechanism comprises a motor, a stirring shaft, and stirring blades. The motor is bolted to the tank. When in use, the motor is turned on, driving the stirring shaft to rotate. The rotating stirring shaft drives the stirring blades to move. Under the high-speed movement of the stirring blades, the stirring blades and the material, as well as the material particles themselves, generate intense collisions, shearing, and tumbling effects. This process, through powerful mechanical energy, first breaks down and deagglomerates the clumps or aggregates present in the initial state of the raw materials, thereby achieving preliminary mixing of the materials.

[0022] S3, simultaneous grinding and modification, involves feeding the premixed material into an ultrafine grinding equipment for processing; The molding process in S103 includes the following steps: S1031, Drying: The mixed raw materials obtained in S102 are dried using drying equipment; S1032, pulverization and sieving: The dried mixed raw materials are pulverized using a pulverizer, and then the pulverized raw materials are sieved out using a filter screen to separate the modifier. It should be noted that when premixed hygroscopic powder and modifier are fed together into an ultrafine pulverizing device, the hygroscopic powder particles are violently broken down under the high-speed mechanical force within the device chamber, rapidly reducing their particle size. Simultaneously, numerous new interfaces are generated due to the breaking of internal chemical bonds. At the same time, the modifier particles coexisting with the powder are fully dispersed and activated under intense collisions, friction, and turbulence. The highly active new powder surface and the modifier particles undergo high-frequency contact and collision at the micron / nanoscale. In this instant, the modifier firmly adheres to and spreads on the new surface of the powder particles through physical adsorption, forming a uniform coating layer. The principle of this process lies in utilizing the mechanochemical effect to highly synchronize the "breaking" and "coating" steps in time and space, thereby achieving efficient in-situ modification on the most active new powder surface, effectively improving the coating rate, uniformity, and bonding strength of the modifier on the powder surface.

[0023] S4, Mechanism: Under the action of mechanical force, component A in the modifier and fumed silica simultaneously complete the spreading, adsorption and nano-isolation embedding on the newly formed particle surface.

[0024] S5, Collection and post-processing: The ground and modified powder is collected using a cyclone collector and a bag filter; The collection and post-processing in S5 includes the following steps: S501, Powder conveying: A cyclone collector is used to collect and convey dispersed powder. S502, Powder collection: Bag filters are used to intercept and collect the conveyed powder.

[0025] It should be noted that the high-speed airflow carrying the finished powder is introduced into the cyclone collector. Its core principle is to utilize the strong rotational motion generated by the high-speed airflow entering the conical container tangentially, thereby forming a huge centrifugal force field. Under the action of this centrifugal force, the denser solid powder particles are thrown towards the wall of the container. After decelerating due to friction with the wall, they slide down the cone to the collection bin at the bottom, achieving preliminary gas-solid separation and continuous collection. Subsequently, the exhaust gas containing powder enters the bag filter from the top of the cyclone separator. Its working principle is to allow the exhaust gas to pass through the filter bag made of special filter material. The powder is physically intercepted and adsorbed by the surface and internal fibers of the filter bag, like an extremely fine sieve, ensuring that the dust is completely captured, while the gas passes through the filter bag and is discharged. The powder is collected in this way.

[0026] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A modified material which is useful for long-term storage of a water-absorbing powder material without agglomeration, characterized in that, The modified material for long-term storage of the water-absorbing powder material without agglomeration comprises the following raw materials by weight: 99-101 parts of the water-absorbing powder and 0.1-1.5 parts of the modifier.

2. The modified material according to claim 1, which is capable of preventing the agglomeration of the water-absorbing powder material during long-term storage, wherein the water-absorbing powder material is a water-absorbing resin powder material. The modifier comprises the following raw materials by weight: 0.5-2 parts of component A, 0.1-0.5 parts of the process aid and 0.9-1.1 parts of the fumed silica.

3. The modified material according to claim 2, which is useful for long-term storage of the water-absorbing powder material without agglomeration, characterized in that, The component A comprises a resin, a surfactant or a dispersant.

4. A process for producing a modified material which can be used for long-term storage of a water-absorbing powder material without agglomeration, characterized by, The preparation process using the modified material for long-term storage of the water-absorbing powder material without agglomeration according to any one of claims 1-3 comprises the following steps: S1, preparation of the modifier, component A, the process aid and the fumed silica are prepared into the required modifier according to the weight ratio; S2, pretreatment and feeding, the water-absorbing powder and the modifier prepared in S1 are premixed according to the mass ratio, and the modifier is added in the form of dry powder; S3, synchronous grinding and modification, the premixed material is put into the superfine crushing equipment for processing; S4, mechanism, under the action of mechanical force, component A in the modifier and the fumed silica are simultaneously completed on the newly generated surface of the particles, including spreading adsorption and nano-isolation inlaying; S5, collection and post-treatment, the ground and modified powder is collected by a cyclone collector and a bag filter.

5. The process for preparing a modified material for use in long-term storage of a water-absorbing powder material without agglomeration according to claim 4, characterized in that, The preparation of the modifier in S1 comprises the following steps: S101, preparation of raw materials, the various raw materials are accurately weighed by an electronic scale; S102, preparation of the mixture, component A and the process aid are mixed, and then the mixed raw materials and the fumed silica are mixed to obtain a wet mixture; S103, molding, the wet mixture obtained in S102 is processed into a modifier powder under dynamic drying at 50-80℃.

6. The process for preparing a modified material for use in long-term storage of a water-absorbing powder material without agglomeration according to claim 5, characterized in that, The preparation of the mixture in S102 comprises the following steps: S1021, preparation of the mixed solution, component A and the process aid are prepared into a mixed solution under the action of stirring; S1022, mixing of raw materials, the fumed silica is placed in a high-speed mixer, and the mixed solution prepared in S1021 is sprayed on the outer wall of the fumed silica.

7. The process for preparing a modified material for use in long-term storage of a water-absorbing powder material without agglomeration according to claim 5, characterized in that, The molding in S103 comprises the following steps: S1031, drying, the mixed raw materials obtained in S102 are dried by using a drying device; S1032, crushing and sieving, the dried mixed raw materials are crushed by using a crusher, and then the crushed raw materials are sieved to obtain the modifier by using a filter screen.

8. The process for preparing a modified material for use in long-term storage of a water-absorbing powder material without agglomeration according to claim 4, characterized in that, The pretreatment and feeding in S2 comprise the following steps: S201, pretreatment of raw materials, the water-absorbing powder and the modifier are accurately weighed by an electronic scale; S202, premixing, the raw materials are put into a container and premixed.

9. The process for preparing a modified material for use in long-term storage of a water-absorbing powder material without agglomeration according to claim 4, characterized in that, The synchronous grinding and modification in S3 comprise the following steps: S301, crushing of raw materials, the water-absorbing powder and the modifier are put into the superfine crushing equipment, and the water-absorbing powder particles are broken by mechanical force to generate a newly generated surface with high activity; S302, modification of raw materials, the newly generated surface of the water-absorbing powder interacts with the modifier particles in the cavity under the action of collision, friction and shearing, and adsorption and coating are completed instantaneously to modify the surface of the water-absorbing powder.

10. The process for preparing a modified material for use in long-term storage of a water-absorbing powder material without agglomeration according to claim 4, characterized in that, The collection and post-processing in S5 includes the following steps: S501, powder delivery, using a cyclone collector to collect and deliver the dispersed powder; S502, powder collection, using a bag filter to block and collect the delivered powder.

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