57 results about "Hygroscopic Agents" patented technology

The utility model discloses a packaging bag designed according to the 3R concept, which comprises a first thin film material, a second thin film material and a non-woven fabric material, the non-woven fabric material and the first thin film material are bonded through sealing and ironing, and a plurality of independent dry moisture absorbent packaging cavities are formed between the middle part of the inner side of a bag body and the bag bottom. The side, close to the bag bottom, of the dry moisture absorbent packaging cavity is sealed through a first clamping chain so that the dry moisture absorbent can be conveniently replaced, the second thin film material and the first thin film material of the sealed non-woven fabric material can be sealed and bonded to form a product containing cavity, and the end, opposite to the bag bottom, of the second thin film material is not sealed to form a bag opening. According to the packaging bag designed according to the 3R concept, multiple contradictions between functionality and environmental protection of traditional moisture-proof packaging are successfully solved, the 3R principle is integrated into packaging design, and the unification of reduction, reutilization and recoverability is achieved through an independent cavity, a replaceable structure and a single material system.

The present disclosure relates to a method for modifying the shape of permeable fibers, such as keratinous fibers, enabling in particular styling of mammalian hair fibers. The method comprises applying to the fibers a composition comprising a natural polymer and a fatty agent, both being water-insoluble and jointly polymerizable, and a water-soluble hygroscopic agent, all afore-said ingredients being small enough to permit their penetration within the fibers; leaving the composition on the fibers for sufficient time so that at least part of said materials penetrate within the fibers; and curing the water-insoluble ingredients to internally form a shapeable polymer capable of maintaining the fibers in a desirable shape. Compositions adapted for such method and kits allowing to prepare the same are also disclosed.

The present invention provides a dehumidifier that ensures a sealing effect and prevents leakage of the calcium chloride liquid hygroscopic agent. [Solution] The dehumidifier includes a dehumidifying bag. The dehumidifying bag includes a breathable sheet section 2 and a non-breathable strip section 3 on the breathable side, and a non-breathable sheet section 1 on the non-breathable side. A double-sided sealing section 6 is provided in the center of the dehumidifying bag, which partitions the internal space surrounded by the non-breathable sheet section and the breathable sheet section. This double-sided sealing section divides the internal space into a fragrance material storage section 4 and a moisture-absorbing material storage section 5. A non-breathable strip section is provided at the opening of the moisture-absorbing material storage section. By providing the double-sided sealing section, the internal space of the dehumidifying bag is partitioned, and the fragrance material and moisture-absorbing material can be filled separately, thereby preventing mutual interference. In addition, by providing the non-breathable strip section, heat welding of the same material is possible after filling with the moisture-absorbing material, ensuring a sealing effect and preventing leakage of calcium chloride liquid.

This utility model discloses a dehumidification device for coking coal storage, comprising a hollow, through-hole housing, with symmetrically distributed support bases fixedly connected to the bottom of the housing. This utility model belongs to the technical field of dehumidification equipment, specifically addressing the problems of natural ventilation being greatly affected by ambient temperature and humidity, the limited moisture absorption capacity of ordinary desiccant requiring frequent replacement, and the high energy consumption and uneven heat distribution of some electrically heated dehumidification devices, which easily accumulate dust inside the equipment, making cleaning difficult and affecting long-term performance.

The invention relates to a Janus structure eutectic gel, a preparation method and application in water trapping and environmental humidity control, and provides a confinement foaming strategy for preparing Janus structure eutectic gel (JEGs) composed of a porous body and a non-porous layer covering the porous body at low cost. The unique structure and component endow the JEGs with huge air contact area and excellent light capture capability, so that compared with the traditional eutectic gel, the JEGs are remarkably enhanced in the aspects of water capture and solar-driven water desorption efficiency. The JEGs serving as a moisture absorbent can be applied to a solar-driven AWH system, in addition, the JEGs can naturally and passively adjust the relative humidity of the microenvironment within a certain range, and the JEGs are suitable for storage and preservation of fresh food.

The invention relates to a photovoltaic cell driven infrared water glass-based water-soluble core targeted curing method which comprises the following steps: 1, uniformly mixing 100 parts by weight of water-soluble salt powder, 10-15 parts by weight of an inorganic solid waste inert filler, 6-10 parts by weight of chopped glass fiber waste silk, 4-5 parts by weight of water glass, 0.1-0.5 part by weight of an infrared energy absorbent and 0.04-0.05 part by weight of an anti-moisture-absorption agent, obtaining a water glass viscous mixture; 2, molding the viscous mixture obtained in the previous step as required to obtain a core blank; and 3, putting the core blank into an infrared curing oven driven by a photovoltaic cell, and carrying out rapid infrared targeted curing to obtain a water glass-based water-soluble core finished product. The prepared soluble salt core is high in strength, easy to collapse and good in moisture absorption resistance, most of the materials are industrial byproducts and solid waste, the cost is low, and obtained castings are high in size precision and surface smoothness and can be used for die casting of aluminum, magnesium alloy and the like.

This invention discloses an online prediction method and system for the remaining lifespan of desiccant in a maintenance-free intelligent desiccant, belonging to the field of power equipment condition monitoring and predictive maintenance technology. This method fully utilizes the built-in temperature and humidity sensors of the maintenance-free desiccant to obtain the average regeneration temperature and average humidity load for each desiccant-regeneration cycle. By calculating the damage fraction caused by a single cycle and accumulating these values, the cumulative damage degree is obtained, ultimately achieving a quantitative and online prediction of the remaining lifespan of the desiccant. This method solves the problem of inaccurate maintenance caused by traditional desiccant replacement relying on fixed cycles or experience-based judgment, realizing a shift from preventative maintenance to predictive maintenance, improving equipment reliability and reducing maintenance costs.

The present application relates to the daily chemical technical field, especially to a three-dimensional water-locking moisturizing composition and a preparation method and application thereof.The preparation raw material of the composition comprises: an aqueous phase, an oil phase and an emulsifier; wherein the oil phase comprises: butyrospermum parkii butter, cetyl stearyl alcohol olivate, sorbitan olivate and polymethylsilsesquioxane.The moisturizing cream provided by the present application has double effects: water supplementing + water locking, contains a moisture absorbent, can absorb moisture in the environment and deliver it to the skin surface, and helps the skin to keep moist; water locking: contains a moisturizing agent, forms a protective film on the skin surface, and reduces water loss.

The invention relates to a durable bio-based PUR hot melt adhesive suitable for a high-humidity environment and a preparation method thereof.The preparation method comprises the steps that firstly, polybasic acid, bio-based dihydric alcohol, polyester trihydric alcohol, siloxane modified polyether polyol, an antioxidant, bio-based tackifying resin and bio-based isocyanate are subjected to a heating reaction, and a prepolymer is obtained; and heating and mixing with a catalyst, a moisture absorbent and a chain extender, and curing. Compared with the prior art, the PUR prepolymer is synthesized by selecting bio-based components with excellent hydrolysis resistance, so that PUR not only meets the bonding strength in a high-humidity environment, but also has the environment-friendly characteristic of a bio-based material; meanwhile, the hydrophobic protection function of siloxane modified polyether polyol, hydrolysis inhibition of a weak acid microenvironment constructed by polyacid and the stabilization effect of a hydrolysis-resistant chain extender on molecular chains are matched, so that the hydrolysis resistance and high-humidity environment adaptation stability of an adhesive layer are improved, and the durability and application value of the adhesive layer in a high-humidity environment are improved; and a feasible scheme is provided for green lamination of materials in a high-humidity environment.

The application discloses a foamed metal-based atmospheric water-absorbing passive heat dissipation material and a preparation method, and relates to high-efficiency passive heat dissipation materials.The foamed metal is used as a framework, and a layer of interconnected carbon nanotubes is grown on the surface of the framework by a flame method.The interconnected structure of the carbon nanotubes can make heat quickly and uniformly conduct to a heat dissipation surface, and the high surface emissivity characteristic of the carbon nanotubes can effectively improve the radiation heat dissipation capacity.On this basis, a hygroscopic agent material is anchored to the surface of the carbon nanotubes, and the atmospheric water-absorbing passive heat dissipation material with remarkable heat dissipation performance is prepared.

The invention discloses a silicon-free core mold material and a preparation method thereof. According to the material, traditional PVA, PVP, urea and silicon-containing filler are abandoned, a sodium alginate polyacrylic acid dynamic cross-linking system is introduced, modified starch porous microspheres and a low-cost moisture absorption resisting agent (such as zinc stearate) are combined, and high strength (compressive strength is larger than or equal to 15 MPa), rapid water solubility (dissolution rate is larger than or equal to 1.0 g / min), low moisture absorption (moisture absorption rate is smaller than or equal to 2.0%) and environment friendliness of a core mold are achieved. The method is suitable for precise forming of complex inner cavity castings such as aero-engine blades, and solves the problems that a traditional material is high in hygroscopicity and insufficient in mechanical property, and the surface quality of a wax mold is affected by silicon-containing filler ash residues.

The invention belongs to the field of air dehumidification applied to air conditioners and industrial production, and particularly relates to a dehumidification system with a double-circulation ventilation system. The invention provides a dehumidification system with a double-circulation air exchange system, the dehumidification system of the double-circulation air exchange system is realized by adopting a partition dehumidification wheel, the dehumidification system comprises a first circulation air exchange system and a second circulation air exchange system, and the dehumidification system has three working states, namely an initial state, a first working state and a second working state. A double-circulation ventilation mode is adopted, heat generated after the moisture absorbent is regenerated can be effectively utilized, production energy consumption is reduced, the utilization efficiency of the moisture absorbent is improved, the moisture absorption efficiency is obviously improved, the regeneration frequency is reduced, the service life of the moisture absorbent is prolonged, the moisture absorption time is conveniently and automatically regulated and controlled, and the device is suitable for factory automatic transformation and has a wide application prospect. Cost is reduced; and labor efficiency is improved.

The invention relates to the technical field of heating agents, in particular to a liquid carbon dioxide cracker heating agent and a preparation method thereof. The liquid carbon dioxide cracker heating agent comprises the following raw materials in parts by weight: 32-52 parts of a strong oxidant, 16-26 parts of a reducing agent, 6-10 parts of a catalyst, 1-16 parts of a combustion improver, 4-8 parts of a moisture absorbent and 3-5 parts of a stabilizer. The strong oxidant and the reducing agent release heat through an oxidation-reduction reaction, the catalyst accelerates the reaction process, the combustion improver optimizes the combustion efficiency, the moisture absorbent regulates and controls the system humidity to prevent moisture, and the stabilizer inhibits particle aggregation and buffers the reaction intensity through a porous structure and surface modification. Through the synergistic effect of the raw materials, heating of the heating agent is stable, ignition is reliable, the energy requirement of a liquid carbon dioxide fracturing device is met, and it is guaranteed that the fracturing process is safe and controllable.

The invention belongs to the technical field of polymer separation membrane preparation, and particularly relates to a method for in-situ preparation of polydopamine in a polymer membrane casting solution system. The method comprises the following steps: dissolving dopamine in a solvent, and adding a polymer material, an inorganic moisture absorbent containing hydrated ions and an oxidizing agent to obtain a polymer membrane casting solution; in a polymer membrane casting solution system, dopamine molecules are guided to be subjected to directed auto-polymerization in the polymer molecular chain direction, polydopamine is generated in situ, and the PDA modified polymer membrane is obtained through defoaming, membrane scraping and phase separation. According to the invention, by constructing a polymer membrane casting liquid system containing specific hydrated ions and a weak oxidant, the directional and efficient polymerization of dopamine along a polymer molecular chain is realized, and PDA synthesis and a membrane forming process are integrated. According to the method, the problems that a traditional PDA modification process is tedious, low in efficiency and low in raw material utilization rate are solved, and the hydrophilicity, permeation flux and anti-pollution performance of the prepared PDA modified polymer membrane are remarkably improved.

An ambient energy converter includes a housing having an upper portion and a lower portion. The housing lower portion has a hydrophobic material portion. The upper portion has a vent opening in fluid communication with ambience. The housing contains a mass of hygroscopic within the housing lower portion that is in fluid communication with the hydrophobic material portion. An ion conductive membrane electrode assembly is coupled to the housing to allow the passage of ionized water or water vapor through the ion conductive membrane electrode and into contact with the hygroscopic solution. An air conduit may be coupled to the housing to provide an airflow to the ion conductive membrane electrode and / or hydrophobic material portion.

The radon adsorption material comprises a moisture absorption layer and an adsorption layer which are sequentially arranged in the filtering direction, the moisture absorption layer comprises two fiber layers and a moisture absorbent, the moisture absorbent is arranged between the two fiber layers and is an activated aluminum oxide ball, the adsorption layer comprises a fixing layer and an adsorbent, and the fixing layer and the adsorbent are sequentially arranged in the filtering direction. The number of the fixed layers is two, the adsorbent is arranged between the two fixed layers, and the adsorbent is modified bamboo activated carbon. The radon adsorption filter element comprises a base, two separation nets, a cover plate and the radon adsorption material, the cover plate and the base are correspondingly arranged, the radon adsorption material is arranged between the cover plate and the base, and the two separation nets are arranged at the two side ends of the radon adsorption material respectively. Activated aluminum oxide is used for preferentially absorbing moisture, the humidity around the modified bamboo activated carbon is reduced, water molecule competition is reduced, and the radon adsorption capacity of the radon adsorption material is improved; hydroxyl groups on the surface of alumina are increased after moisture absorption, radon molecules are fixed through hydrogen bonds, and the radon adsorption capacity of the material is improved.

A cooling pad, a method of making the cooling pad, and a method of using the cooling pad are provided. Such a cooling pad includes a hydrogel layer, a protective backing layer coated with a first adhesive layer, and a second adhesive layer. The backing layer coated with the first adhesive layer, and the second adhesive layer are disposed on two different sides of the hydrogel layer. The hydrogel layer comprises a base polymer as a first base ingredient for the hydrogel layer, a second base ingredient for the hydrogel layer, and an additive or filler, which may include a moisture absorbing agent, a stabilizing agent, an antimicrobial agent, a photothermal agent, or any other additive or filler, or any combination thereof.

The application provides an anti-water-permeation type active mineral desiccant and a preparation method thereof, and comprises the following steps: S1, baking natural clay, immersing the natural clay in acid liquid, expanding the internal pores of the natural clay, and obtaining a porous framework; S2, mixing an alcohol compound and a cross-linking agent to prepare a gel precursor, uniformly mixing a moisture absorbent and the gel precursor, jointly filling the moisture absorbent and the gel precursor in the pores of the porous framework, performing heat preservation treatment, making the gel precursor form a gel in the pores, fixing the moisture absorbent in the pores, drying, and obtaining a preliminary product; and S3, uniformly mixing the preliminary product and an additive, performing shaping, drying, and baking and curing, making the porous framework and the gel keep a stable state, and obtaining the anti-water-permeation type active mineral desiccant. By jointly filling the gel precursor and the moisture absorbent in the pores of the porous framework after activation treatment, and in-situ generating the gel in the pores to fix the moisture absorbent, the high moisture absorption capacity and the anti-water-permeation stability are realized.

The invention provides a silicon dioxide preparation method which comprises the following steps: S1, adding an alkoxy silane compound into an aqueous solution with a first pH value, so that the alkoxy silane compound is hydrolyzed and polymerized into linear polysiloxane chain sol, and the first pH value is less than or equal to 2; s2, after the PH value of the reaction solution obtained in the step S1 is adjusted to a second PH value, linear polysiloxane chain crosslinking is catalyzed at the environment temperature smaller than or equal to 100 DEG C, a gelation network is formed, and the second PH value is 1.8-2.5; s3, the temperature is increased to 100-300 DEG C, silicon dioxide is obtained, silicon dioxide has the high specific surface area, the micropore characteristic and the high porosity, the water adsorption capacity of a porous silicon dioxide adsorbent in the prior art at low humidity is improved through the structural characteristic, and the material has good adsorption and desorption cycle stability.

The invention belongs to the technical field of dust suppressants, and particularly relates to a coal dust suppressant and a preparation method thereof. Every 100 parts by weight of the coal dust suppressant comprises the following components in parts by weight: 15-35 parts of a polymer binder, 3-8 parts of a polysaccharide binder, 10-12 parts of a moisture absorbent, 1-2 parts of an inorganic salt aid, 1-3 parts of a surfactant, 1-3 parts of sodium lactate and the balance of water. The coal dust suppressant can still keep excellent stability and rapid solubility under the low-temperature condition, biodegradable natural polysaccharide and a small amount of inorganic salt are adopted as main raw materials, and the prepared coal dust suppressant effectively avoids introduction of toxic and harmful substances; meanwhile, all the dust suppressant products are made of food-grade or medical-grade degradable raw materials, so that the dust suppressant products are environment-friendly in the whole life cycle, and the risk of secondary pollution is avoided. In the aspect of dust suppression performance, the coal dust suppressant can form a high-strength and high-thickness compact crusting layer on the surface of a coal pile after being diluted and sprayed, and the strength of the coal dust suppressant exceeds 80HA.

The invention discloses an HNBR rubber material suitable for continuous vulcanization in an extrusion hot drying tunnel. The HNBR rubber material is prepared from the following raw materials in parts by weight: 60-150 parts of HNBR, 1-15 parts of an active agent, 1-15 parts of an anti-aging agent, 10-150 parts of carbon black, 1-40 parts of a plasticizer, 0.5-10 parts of sulfur, 1-10 parts of an accelerant, 1-20 parts of a peroxide cross-linking agent, 1-10 parts of an assistant cross-linking agent and 1-20 parts of a moisture absorbent. The invention also discloses a sealing strip which is prepared from the HNBR material through extrusion preforming and continuous vulcanization in a hot drying tunnel. According to the invention, the HNBR with the double bond content greater than or equal to 5% is used as a matrix sizing material, a sulfur vulcanization system and a peroxide cross-linking system are used as cross-linking agents, the sealing strip prepared from the HNBR sizing material has good compression permanent deformation capability, and the sealing use function in the normal service process is ensured.

The application provides a dust suppressant and a preparation method and application thereof, and according to the weight percentage, the dust suppressant comprises the following components: 25-35% of sugarcane molasses, 0.5-1.5‰ of penetrating agent, 1.5-2.5% of hygroscopic agent, 1.5-2.5% of water-retaining agent, and the balance of water. The dust suppressant has multiple advantages. Firstly, the main material of the dust suppressant is sugarcane molasses, a by-product of sugar industry, which is low in price and widely available. More than 98% of the raw materials in the dust suppressant are environment-friendly materials, so the dust suppressant has the advantages of green environmental protection. Secondly, the dust suppressant can integrate the functions of adhesion, wetting, moisture absorption and water retention, can make the dust solidify, has good anti-damage performance, can effectively resist the interference of external force, inhibit the dust raising phenomenon, and has ideal dust suppression effect.

The invention relates to the technical field of rubber products, in particular to a rubber sealing strip and a preparation method and application thereof. The rubber sealing strip comprises the following raw materials in parts by weight: 80-100 parts of ethylene propylene diene monomer, 100-140 parts of carbon black, 100-140 parts of modified fly ash, 70-100 parts of a plasticizer, 5-8 parts of zinc oxide, 1-2 parts of stearic acid, 1-3 parts of a flow promoter, 1-2 parts of microcrystalline wax, 10-20 parts of a moisture absorbent, 1-2 parts of an active agent, 2-4 parts of an accelerant and 1-2 parts of a vulcanizing agent. Through a specific surface modification technology and formula design, the problems of poor dispersibility and compatibility of fly ash in a rubber matrix are solved through raw material synergism, and the fly ash automobile rubber sealing strip with excellent performance is developed.

The invention discloses a normal-temperature self-drying repair coating for a foaming type PVC stone chip resistant coating, a preparation method and a construction method, and belongs to the technical field of surface protection of automobile parts. Hydrocarbon resin and a thermoplastic elastomer are weighed and added into a first part of diluent, and a resin solution is prepared; sequentially adding the nano calcium carbonate, the pigment, the filler, the antioxidant and the moisture absorbent into the resin solution, and stirring and dispersing after adding to obtain a uniform first mixed system; adding the polymer particles and the residual diluent into the first mixed system, and continuously stirring and dispersing to uniformly disperse the polymer particles to obtain a second mixed system; carrying out vacuum degassing on the second mixed system to obtain the bubble-free and uniformly-dispersed normal-temperature self-drying repair coating. After repairing construction, the coating and an original coating are small in color difference and similar in appearance, the adhesive force and stone impact resistance of the repairing coating are excellent, and the problems that in the prior art, repairing cost is high, efficiency is low, heating curing is needed, and coating decoration is insufficient are solved.

The invention provides high-color-fastness disperse dye direct-injection ink and a preparation method thereof, and a process method of disperse dye ink direct-injection printing, the high-color-fastness disperse dye direct-injection ink comprises disperse dye color paste, a self-crosslinking agent, a penetrant and a moisture absorbent; and the self-crosslinking agent is selected from resin with the self-crosslinking temperature of 45-60 DEG C. Under the combined action of the self-crosslinking agent, the penetrant and the moisture absorbent, the disperse dye direct-jet ink jet-printed on the fabric has high rubbing fastness, high washing fastness and excellent pattern definition and color expressive force, and meanwhile, the procedures of pretreatment sizing and post-treatment washing can be omitted; the process flow is simplified, the production cost is controlled, and the environmental pollution is greatly reduced.

This invention provides a composite yarn and its preparation method, relating to the field of textile manufacturing technology. The composite hygroscopic agent used in this invention effectively prevents salt leakage by utilizing the pore confinement effect of a metal-organic framework; a polar polymer skeleton carrier achieves uniform dispersion and fixation of the composite hygroscopic agent, effectively preventing its shedding and improving the hygroscopic performance of the composite yarn; moreover, micro-nano composite fibers are attached in situ to the surface of short fibers, forming a macro-micro cross-scale structure. These micro-nano composite fibers effectively disperse loads, bridge fiber microcracks, and inhibit their propagation, significantly improving the yarn's fracture toughness. The micro-nano composite fibers fully fill the gaps between short fibers, optimizing the internal stress transmission path while significantly increasing inter-fiber frictional resistance, allowing more fibers to contribute their inherent strength simultaneously and efficiently. This improves the hygroscopicity of the composite yarn without sacrificing its mechanical properties, achieving a synergistic improvement in both hygroscopicity and strength.

The application discloses a dehumidification / hydrogen and oxygen production device and method coupled with moisture collection and water vapor electrolysis, and belongs to the technical field of environmental humidity control / collection and water vapor electrolysis. The device is sequentially assembled by an anode clamp plate, an anode electrode plate, a membrane electrode assembly, a cathode electrode plate and a cathode clamp plate, the anode clamp plate is filled with low-regeneration-temperature moisture-absorbing medium and is provided with an oxygen outlet, and the cathode clamp plate is provided with a hydrogen outlet. After wet air is rapidly dehumidified by the moisture-absorbing medium in the moisture collection unit, the wet air is heated by ohmic heat generated in the electrolysis process and water vapor is separated out, the water vapor is electrolyzed in a PEM electrolytic cell to generate hydrogen and oxygen at the cathode and the anode respectively, and the in-situ regeneration of the moisture-absorbing medium is realized. The device significantly improves the dehumidification rate and durability, does not need to replace the moisture-absorbing agent, and can also utilize the environmental humidity to produce hydrogen and oxygen, is suitable for precision instrument moisture-proof and humidity control scenes, and effectively solves the problems of limited capacity, complex regeneration and difficult humidity reuse in the traditional desiccant technology.

This utility model relates to the technical field of powder storage. Specifically, it discloses a chemical raw material storage box, including a box body and a support frame. The box body is mounted on the support frame, and a lid is rotatably mounted on the top of the box body. A limiting component for fixing the position of the lid is provided on the box body. A moisture-proof and water-absorbing component is provided inside the box body. The moisture-proof and water-absorbing component includes a mounting base and a water-absorbing box. The water-absorbing box contains a desiccant. A venting component is provided on one side of the box body. The advantage of this utility model is that the moisture-proof and water-absorbing component can dry the air inside the storage cavity. When the air pressure inside the storage cavity is high, the air inside the storage cavity can be discharged through the venting component, thereby facilitating the storage of chemical raw materials.

The invention relates to a proton exchange membrane electrode, a preparation method thereof and a proton exchange membrane fuel cell, the proton exchange membrane electrode comprises a catalyst layer, the catalyst layer comprises a composite moisture absorbent, the composite moisture absorbent comprises an inner core and a shell layer, the inner core comprises microcrystalline cellulose, and the shell layer comprises a zeolite imidazole organic framework material. The membrane electrode disclosed by the invention can realize long-term stable operation under a dry working condition, and the proton exchange membrane fuel cell has excellent durability.

The utility model discloses a kind of feeding devices for infrared static drying machine, it is related to infrared drying equipment technical field.The utility model includes conveyer belt, the conveyer belt top is fixedly connected with drying equipment, the conveyer belt top one side is provided with preheating mechanism, the preheating mechanism includes the preheating box of fixedly connected in the conveyer belt top, the air jet subassembly of being set in the preheating box inner top, and the fan of fixedly connected in the drying equipment one side.The utility model extracts high-temperature waste gas of drying equipment by fan, is transported to dehumidification box by conveying pipe, by agitating rod dynamic agitation hygroscopic agent intensification dehumidification, dry hot air is introduced into preheating box by connecting pipe, downward injection is carried out by nozzle, diffusion is even hot air curtain covering material by wind-resisting filter screen, this process converts waste heat into preheating energy, evaporates surface moisture before material enters main drying area, effectively reduces main drying energy consumption, simultaneously avoids the secondary humidification problem caused by wet air backfilling.