Preparation method of silica gel core material for honeycomb rotary dehumidification

Abstract

The application provides a preparation method of a honeycomb rotary dehumidification silica gel core material, and belongs to the technical field of air dehumidification. The method comprises the following steps: corrugated paper is obtained by rolling corrugated paper with alkaline silica sol and glass fiber paper; the corrugated paper is bonded with flat glass fiber paper to obtain a honeycomb glass fiber paper block; the honeycomb glass fiber paper block is immersed in water glass, dried, and a honeycomb glass fiber paper block loaded with water glass is obtained; the honeycomb glass fiber paper block loaded with water glass is placed in a sealed container, CO2 gas is introduced from the top, the pressure of the CO2 gas is kept between 0.1-0.7 MPa, the water glass reacts with CO2 to form silicic acid, the silicic acid is polymerized and gelled to form silica gel, and a honeycomb glass fiber paper block loaded with silica gel is obtained; the honeycomb glass fiber paper block loaded with silica gel is washed to neutral, aged in an acid solution with a pH value of 4-5, and a honeycomb glass fiber paper block after aging is obtained; and the honeycomb glass fiber paper block after aging is sequentially dried and calcined to obtain a honeycomb rotary dehumidification silica gel core material.

Description

Technical Field

[0001] This invention belongs to the field of air dehumidification technology, specifically relating to a method for preparing a silicone core material for honeycomb rotary dehumidification. Background Technology

[0002] Environmental humidity has a close relationship with people's lives and industrial and agricultural production. Controlling humidity is of great significance for improving living conditions, developing production technology, ensuring production processes, and improving product quality. Non-mechanical dehumidification control methods that utilize humidity-regulating materials to achieve humidity control have advantages such as high efficiency, low energy consumption, system simplicity, and environmental friendliness, and have become the mainstream in the dehumidification field. Among them, the adsorption-type honeycomb rotary dehumidification system using solid desiccant as the core material uniformly attaches solid desiccant to glass fiber paper or ceramic fiber to form a honeycomb block. By regenerating the desiccant after moisture absorption, it can be recycled, ensuring the continuous operation of the entire dehumidification process. Due to its simple structure, high operational reliability, large air handling capacity, large moisture absorption capacity, high dehumidification efficiency, and deep dehumidification capability, the honeycomb rotary dehumidification system has broad market application prospects.

[0003] The most commonly used solid desiccant in honeycomb rotary dehumidification systems is silica gel and its derivatives or complexes. However, existing silica gel desiccants still have many shortcomings as honeycomb rotary dehumidification materials: On the one hand, the pore structure distribution, the main physical property parameter that determines the drying performance of silica gel, still needs further optimization, resulting in a large room for improvement in dehumidification performance; on the other hand, most current methods for preparing silica gel use water glass and corrosive strong acid (sulfuric acid) as raw materials, which makes it easy for the sol adhering to the glass fiber paper to enter the solution during the preparation process, resulting in a small amount of sol adhering to the glass fiber paper and low dehumidification efficiency. At the same time, the use of a large amount of corrosive strong acid is not environmentally friendly. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a method for preparing a silica gel core material for honeycomb rotary dehumidifiers. The preparation method provided by this invention is green and environmentally friendly, and the resulting silica gel core material for honeycomb rotary dehumidifiers has a large specific surface area and pore volume, a large adsorption capacity, and a large hanging capacity.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] This invention provides a method for preparing a silica gel core material for honeycomb rotary dehumidifiers, comprising the following steps:

[0007] Corrugated paper made from alkaline silica sol-shaped fiberglass paper is bonded to flat fiberglass paper while still wet to form a honeycomb fiberglass paper block.

[0008] The honeycomb fiberglass paper block is immersed in water glass and dried to obtain a honeycomb fiberglass paper block loaded with water glass.

[0009] The water glass-loaded honeycomb fiberglass paper block is placed in a sealed container, and CO2 gas is introduced from the top, maintaining the pressure of the CO2 gas between 0.1 and 0.7 MPa. The water glass on the honeycomb fiberglass paper block reacts with CO2 to form silicic acid. The silicic acid polymerizes and gels to form silica gel, thus obtaining a silica gel-loaded honeycomb fiberglass paper block.

[0010] The silicone-loaded honeycomb fiberglass paper block was washed until neutral and aged in an acidic solution with a pH of 4-5 to obtain an aged honeycomb fiberglass paper block.

[0011] The aged honeycomb fiberglass paper blocks are dried and calcined sequentially to obtain silicone core material for honeycomb rotary dehumidification.

[0012] Preferably, the preparation of the honeycomb fiberglass paper block includes: impregnating flat fiberglass paper in alkaline silica sol, hot rolling the fiberglass paper impregnated with alkaline silica sol to obtain corrugated fiberglass paper; and alternately stacking the corrugated fiberglass paper and flat fiberglass paper to obtain the honeycomb fiberglass paper block.

[0013] Preferably, the concentration of the alkaline silica sol is 30-50%, and the average particle size of the silica sol particles in the alkaline silica sol is 20-40 nm.

[0014] Preferably, the hot rolling temperature is 50–70°C.

[0015] Preferably, the concentration of the water glass is 35-50 wt%, and the modulus is 2.0-4.0.

[0016] Preferably, the immersion time of the honeycomb fiberglass paper block in water glass is 3 to 15 minutes.

[0017] Preferably, the acid solution includes a sulfuric acid solution or a hydrochloric acid solution;

[0018] The aging temperature is 40–60°C, and the time is 0.5–1.5 h.

[0019] Preferably, the sequential drying and calcination includes: sequentially performing a first drying, a first heating, a second drying, a second heating, and calcination, wherein the temperature of the first drying is 30-50°C and the holding time is 0.5-1.5h; the temperature of the second drying is 70-90°C and the holding time is 0.5-1.5h; and the temperature of the calcination is 160-190°C and the holding time is 1-3h.

[0020] Preferably, the temperature for drying the honeycomb fiberglass paper block is 45-60°C, and the drying is carried out until no liquid water glass flows on the surface of the honeycomb fiberglass paper block.

[0021] Preferably, introducing CO2 gas into the sealed container of the water glass-loaded honeycomb fiberglass paper block includes: placing the water glass-loaded honeycomb fiberglass paper block along the vertical direction of the honeycomb holes, and allowing CO2 gas to enter through the opening above the honeycomb holes.

[0022] This invention provides a method for preparing a silica gel core material for honeycomb rotary dehumidifiers, comprising the following steps: corrugated paper rolled from alkaline silica sol-shaped fiberglass paper is bonded to flat fiberglass paper while wet to form a honeycomb fiberglass paper block; the honeycomb fiberglass paper block is immersed in water glass and dried to obtain a water glass-loaded honeycomb fiberglass paper block; the water glass-loaded honeycomb fiberglass paper block is placed in a sealed container, and CO2 gas is introduced from above, maintaining the CO2 gas pressure between 0.1 and 0.7 MPa, the water glass on the honeycomb fiberglass paper block reacts with CO2 to form silicic acid, the silicic acid polymerizes and gels to form silica gel, obtaining a silica gel-loaded honeycomb fiberglass paper block; the silica gel-loaded honeycomb fiberglass paper block is washed until neutral and aged in an acidic solution with a pH of 4 to 5 to obtain an aged honeycomb fiberglass paper block; the aged honeycomb fiberglass paper block is successively dried and calcined to obtain the silica gel core material for honeycomb rotary dehumidifiers. This invention utilizes inexpensive CO2 to replace the corrosive strong acid used in the traditional preparation of silica gel drying materials, avoiding equipment corrosion caused by the use of sulfuric acid and ensuring the safety of the production process. Furthermore, this invention leverages the permeability and heavier-than-air properties of CO2 gas, allowing it to be introduced from top to bottom. This promotes the timely reaction between CO2 gas and the water glass adhering to the inside and outside of the honeycomb fiberglass paper block to produce silicic acid. The silicic acid molecules undergo a polymerization reaction to form a high-concentration silica sol, which further rapidly coagulates into a silicic acid gel (i.e., wet silica gel), making it difficult to detach and achieving complete fusion of silica hydrogel and fiberglass paper, resulting in a large amount of adhesive. This invention regulates the network structure of the silicic acid gel formed by the reaction of water glass and CO2 by adjusting the CO2 gas pressure, thereby controlling the drying performance of the silica gel and ensuring good drying properties of the silica gel on the honeycomb fiberglass paper block. Aging in an acid solution ensures that the silica gel particles loaded on the honeycomb fiberglass paper block are uniform and form a stable spatial network structure.

[0023] Furthermore, in the preparation of the honeycomb fiberglass paper block, the present invention utilizes the adhesive properties of alkaline silica sol to firmly bond the flat fiberglass paper and the corrugated fiberglass paper together, resulting in a compact surface structure and high strength of the fiberglass paper, which meets the strength requirements for use on the honeycomb roller.

[0024] The preparation method of this invention is simple to operate and uses inexpensive raw materials. This invention provides a green process for preparing silica gel core material for drying honeycomb rotors, and also provides a new way for carbon neutralization.

[0025] The data from the examples show that the silicone core material for honeycomb rotors prepared by this invention has good drying performance and a specific surface area of ​​498–698 m².2 ·g -1 The pore volume is 0.26–0.48 mL·g. -1 At RH values ​​of 5%, 30%, and 50%, the adsorption capacity of the silica gel drying material ranged from 45 to 98 mg / g, 103 to 158 mg / g, and 212 to 276 mg / g, respectively. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 The products are flat fiberglass paper, corrugated fiberglass paper shaped and rolled with alkaline water glass, and honeycomb fiberglass paper blocks.

[0028] Figure 2 The N2 adsorption-desorption isotherms and pore size distribution curves are for the silicone core materials prepared in Examples 1-3 and Comparative Example 1. Detailed Implementation

[0029] This invention provides a method for preparing a silica gel core material for honeycomb rotary dehumidifiers, comprising the following steps:

[0030] Corrugated paper made from alkaline silica sol-shaped fiberglass paper is bonded to flat fiberglass paper while still wet to form a honeycomb fiberglass paper block.

[0031] The honeycomb fiberglass paper block is immersed in water glass and dried to obtain a honeycomb fiberglass paper block loaded with water glass.

[0032] The water glass-loaded honeycomb fiberglass paper block is placed in a sealed container, and CO2 gas is introduced from the top, maintaining the pressure of the CO2 gas between 0.1 and 0.7 MPa. The water glass on the honeycomb fiberglass paper block reacts with CO2 to form silicic acid. The silicic acid polymerizes and gels to form silica gel, thus obtaining a silica gel-loaded honeycomb fiberglass paper block.

[0033] The silicone-loaded honeycomb fiberglass paper block was washed until neutral and aged in an acidic solution with a pH of 4-5 to obtain an aged honeycomb fiberglass paper block.

[0034] The aged honeycomb fiberglass paper blocks are dried and calcined sequentially to obtain silicone core material for honeycomb rotary dehumidification.

[0035] Unless otherwise specified, all raw materials used in this invention are commercially available products well known in the art.

[0036] This invention uses corrugated paper made from alkaline silica sol-shaped fiberglass paper, which is then bonded to flat fiberglass paper while still wet to form a honeycomb fiberglass paper block.

[0037] In this invention, the preparation of the honeycomb fiberglass paper block shaped with alkaline silica sol preferably includes: impregnating flat fiberglass paper in alkaline silica sol, and hot rolling the fiberglass paper impregnated with alkaline silica sol to obtain shaped corrugated fiberglass paper.

[0038] In this invention, the areal density of the flat glass fiber paper is preferably 50-200 g / m³. 2 More preferably 90–150 g / m 2 .

[0039] In this invention, the concentration of the alkaline silica sol is preferably 30-50%, more preferably 35-40%, and the average particle size of the silica sol particles in the alkaline silica sol is preferably 20-40 nm, more preferably 25-35 nm. This invention does not have special requirements on the amount of alkaline silica sol used, as long as it is sufficient to completely immerse the flat fiberglass paper.

[0040] In this invention, the temperature for hot rolling is preferably 50-70°C, more preferably 55-65°C.

[0041] In this invention, the corrugated fiberglass paper obtained after hot rolling is preferably layered alternately with flat fiberglass paper while still wet to obtain the honeycomb fiberglass paper block. In this invention, the honeycomb fiberglass paper block does not require any adhesive; the adhesive properties of alkaline silica sol are directly used to firmly bond the flat and corrugated fiberglass paper together before and after the reaction, forming a compact surface structure with high fiberglass paper strength and a bursting strength index greater than 0.2 kPa·m. 2 ·g -1 It fully meets the strength requirements for use on a rotary wheel.

[0042] In this invention, the height of the honeycomb fiberglass paper block is preferably 70-100 mm, more preferably 80-95 mm. In an embodiment of this invention, the dimensions of the honeycomb fiberglass paper block are 85 mm × 85 mm × 85 mm.

[0043] This invention involves immersing a honeycomb fiberglass paper block in water glass, removing it, and drying it to obtain a honeycomb fiberglass paper block loaded with water glass. In this invention, the concentration of the water glass is preferably 35–50 wt%, more preferably 39–45 wt%, and the modulus is preferably 2.0–4.0, more preferably 2.5–3.5. By controlling the concentration and modulus of the water glass within the above ranges, this invention ensures both sufficient SiO2 content and adequate viscosity. Higher concentrations result in higher viscosity, and the viscosity decreases with prolonged storage time, which is detrimental to the adhesion of adhesive to the honeycomb fiberglass paper block.

[0044] In this invention, the immersion time of the honeycomb fiberglass paper block in water glass is preferably 3 to 15 minutes, more preferably 8 to 12 minutes.

[0045] In this invention, the drying temperature is preferably 45–60°C, more preferably 50–55°C. Drying continues until no liquid water glass flows on the surface of the honeycomb fiberglass paper block. This invention does not have special requirements for the drying method; any drying method well-known to those skilled in the art, such as oven drying, can be used. When drying the water glass-impregnated honeycomb fiberglass paper block, it is necessary to retain a certain moisture content to facilitate reaction with carbon dioxide, while preventing the water glass from flowing and forming a liquid column that could block the honeycomb channels.

[0046] After obtaining the water glass-loaded honeycomb fiberglass paper block, the present invention places the water glass-loaded honeycomb fiberglass paper block into a sealed container, introduces CO2 gas from the top, and maintains the pressure of the CO2 gas between 0.1 and 0.7 MPa. The water glass on the honeycomb fiberglass paper block reacts with CO2 to form silicic acid. The silicic acid polymerizes and gels to form silica gel, thus obtaining a silica gel-loaded honeycomb fiberglass paper block.

[0047] In this invention, the preferred method of introducing CO2 gas into the sealed container of the water-glass-loaded honeycomb fiberglass paper block includes: placing the water-glass-loaded honeycomb fiberglass paper block along the vertical direction of the honeycomb pores, with CO2 gas entering through the opening at the top of the honeycomb pores. In an embodiment of this invention, the method of introducing CO2 gas into the sealed container of the water-glass-loaded honeycomb fiberglass paper block specifically involves: placing the water-glass-loaded honeycomb fiberglass paper block into a sealed, high-pressure, visible reactor equipped with a thermometer, ensuring the honeycomb pores are vertical so that gas can flow along the pore direction, and introducing carbon dioxide gas from the top of the reactor.

[0048] In this invention, the pressure of the CO2 gas is preferably 0.1–0.7 MPa, more preferably 0.2–0.5 MPa. Carbon dioxide reacts with water glass adhering to the fiberglass paper block. Heat is released during the reaction, and the temperature on the thermometer in the reactor begins to rise. After 0.5–1 hour of reaction, the temperature displayed on the thermometer remains essentially constant, resulting in a silica-loaded honeycomb fiberglass paper block. This invention utilizes the permeability and heavier-than-air properties of CO2 gas, introducing it from top to bottom into the reactor. This facilitates the timely reaction of the water glass adhering to the inside and outside of the honeycomb fiberglass paper block to produce silicic acid. The silicic acid molecules undergo a polymerization reaction to form a high-concentration silica sol, which further rapidly coagulates into a silica gel (i.e., wet silica gel), making it difficult to detach and completely achieving the fusion of silica hydrogel and fiberglass paper, resulting in a large amount of adhesive. By controlling the CO2 pressure, the rate of the water glass neutralization reaction, and the amount of silica gel nuclei, this invention obtains a silica gel drying material with appropriate size, porosity, and a large specific surface area.

[0049] After obtaining the silicone-loaded honeycomb fiberglass paper block, the present invention washes the silicone-loaded honeycomb fiberglass paper block to neutral and ages it in an acidic solution with a pH of 4-5 to obtain the aged honeycomb fiberglass paper block.

[0050] In this invention, the washing solution used to wash the silica-loaded honeycomb fiberglass paper block to neutrality is preferably water. The purpose of washing to neutrality is to remove the carbonates or bicarbonates generated after the reaction, preventing silica gel from detaching during aging. This invention does not have special requirements for the washing method; any washing method well-known to those skilled in the art can be used.

[0051] In this invention, the acid solution preferably includes a sulfuric acid solution or a hydrochloric acid solution, with sulfuric acid solution being preferred for aging. The aging temperature is preferably 40–60°C, more preferably 45–55°C, and the aging time is preferably 0.5–1.5 h, more preferably 0.75–1 h. This invention does not have special requirements on the amount of acid solution used, as long as it is sufficient to completely immerse the silica-loaded honeycomb fiberglass paper. The newly formed gel on the honeycomb fiberglass paper block is very loose. Through further aging, the silica particles loaded on the honeycomb fiberglass paper block become uniform and form a stable spatial network structure. This both homogenizes the silica particles and further strengthens the spatial network structure of the silica hydrogel, preventing structural collapse due to moisture evaporation during subsequent drying, which would affect the drying performance parameters of the prepared silica desiccant.

[0052] In this invention, after the silicone on the honeycomb fiberglass paper block is aged, it preferably further includes filtering the aged silicone-loaded honeycomb fiberglass paper block dry. There are no special requirements for the filtering method; any filtering method well-known to those skilled in the art can be used.

[0053] The present invention obtains an aged honeycomb fiberglass paper block loaded with silicone, and then dries and calcines the aged honeycomb fiberglass paper block in sequence to obtain a silicone core material for honeycomb dehumidification.

[0054] In this invention, the sequential drying and calcination preferably includes sequentially performing a first drying, a first heating, a second drying, a second heating, and calcination. The temperature of the first drying is preferably 30–50°C, more preferably 35–45°C, and the holding time is preferably 0.5–1.5 h, more preferably 0.75–1 h; the temperature of the second drying is preferably 70–90°C, more preferably 73–85°C, and the holding time is preferably 0.5–1.5 h, more preferably 0.75–1 h; the temperature of the calcination is preferably 160–190°C, more preferably 170–185°C, and the holding time is preferably 1–3 h, more preferably 1.5–2.5 h. This invention employs segmented drying and calcination. The first two stages at low temperatures are to slowly dry the water in the silica hydrogel, minimizing damage to the hydrogel's spatial network structure. The final stage of heating removes moisture from the structure, improving the purity and thermal stability of the generated silica gel.

[0055] The present invention preferably uses a muffle furnace with programmed temperature rise in air atmosphere for drying and calcination. In the present invention, the rates of the first and second temperature rises are preferably 2°C / min.

[0056] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to specific examples. The described embodiments are only some embodiments of the present invention, and not all embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the embodiments of the present invention based on the technical essence and general principles of the present invention without creative effort should be within the protection scope of the present invention.

[0057] Example 1

[0058] An alkaline silica sol with an average particle size of 30 nm and a concentration of 40% was used as a setting agent to impregnate surfaces with a density of 100 g / m². 2 Flat fiberglass paper is rolled into corrugated fiberglass paper on a hot rolling mill. The rolled corrugated fiberglass paper is then laminated together with the flat fiberglass paper in a staggered manner to form a honeycomb fiberglass paper block measuring 85mm × 85mm × 85mm. Photos of the flat fiberglass paper, the rolled corrugated fiberglass paper, and the resulting honeycomb fiberglass paper can be found in [link to photos]. Figure 1 .

[0059] The prepared honeycomb fiberglass paper block was immersed in water glass with a modulus of 3.2 and a concentration of 40% at room temperature. After 10 minutes, it was taken out and dried in a ventilated drying oven at 50°C until there was no liquid flow on the surface, thus obtaining the honeycomb fiberglass paper block loaded with water glass.

[0060] The honeycomb fiberglass paper block loaded with water glass is placed vertically into a sealed, visible high-pressure reactor equipped with a thermometer. Carbon dioxide gas is introduced from the top of the reactor, and the pressure in the reactor is kept constant at 0.1 MPa by a solenoid valve. The honeycomb fiberglass paper block is removed when the temperature of the thermometer in the reactor stops changing.

[0061] The extracted honeycomb fiberglass paper blocks were washed multiple times with deionized water to remove the carbonates or bicarbonates generated by the reaction of water glass and carbon dioxide, until the sample became neutral. The washed honeycomb fiberglass paper was then placed in a sulfuric acid solution with a pH of 4.5 and heated to 40°C for 1 hour to age. After aging, the paper was removed and filtered dry. The filtered honeycomb fiberglass paper blocks were placed in a muffle furnace with a programmed temperature rise, and heated at a rate of 2°C / min, holding at 40°C for 1 hour, at 80°C for 1 hour, and then at 180°C for 2 hours. The mixture was then allowed to cool naturally to room temperature to obtain the silicone core material for honeycomb rotary dehumidifiers.

[0062] Example 2

[0063] The pressure in the reactor was kept constant at 0.3 MPa. Other conditions were the same as in Example 1.

[0064] Example 3

[0065] The pressure in the reactor was kept constant at 0.5 MPa. Other conditions were the same as in Example 1.

[0066] Comparative Example 1

[0067] An alkaline silica sol with an average particle size of 30 nm and a concentration of 40% was used as a setting agent to impregnate surfaces with a density of 100 g / m². 2 Flat fiberglass paper is rolled into corrugated fiberglass paper on a hot rolling mill. Then, the rolled corrugated fiberglass paper and flat fiberglass paper are laminated together in a staggered manner to form a honeycomb fiberglass paper block of 85mm×85mm×85mm.

[0068] The prepared honeycomb fiberglass paper block was immersed in water glass with a modulus of 3.2 and a concentration of 40% at room temperature. After 10 minutes, it was taken out and dried in a ventilated drying oven at 50°C until there was no liquid flow on the surface, thus obtaining the water glass-loaded honeycomb fiberglass paper.

[0069] The honeycomb fiberglass paper block loaded with water glass was directly immersed in a sulfuric acid solution with a pH of 1 for reaction. Once the pH of the solution no longer changed, the fiberglass paper was removed. The filtered honeycomb fiberglass paper block was placed in a muffle furnace with a programmed temperature rise, and heated at a rate of 2℃ / min, held at 40℃ for 1 hour, at 80℃ for 1 hour, and then at 180℃ for 2 hours, before naturally cooling to room temperature.

[0070] Figure 2The N2 adsorption-desorption isotherms and pore size distribution curves of the silica gel core materials for honeycomb rotary dehumidification prepared in Examples 1-3 and Comparative Example 1 are shown. The physical parameters (specific surface area, average pore diameter, pore volume, etc.) of the prepared silica gel drying materials were characterized using a BSD-PS2 specific surface area and pore size analyzer. Figure 2 As can be seen from the table, the specific surface area and pore size distribution curves of the silicone core material for honeycomb dehumidification are different depending on the CO2 pressure. When the CO2 pressure is 0.3 MPa, the specific surface area of ​​the prepared silicone core material for honeycomb dehumidification is the largest. The specific data are shown in Table 1.

[0071] The adsorption performance (adsorption capacity) of the silica gel core materials for honeycomb rotary dehumidification prepared in Examples 1-3 and Comparative Example 1 was characterized using a BSD-DVS atmospheric pressure dynamic multi-station gravimetric gas vapor adsorption analyzer. The results are shown in Table 1.

[0072] Table 1. Physical parameters and adsorption properties of the prepared silica gel drying material

[0073]

[0074] Table 1 shows that the CO2 concentration changed with varying CO2 pressure, resulting in significant variations in the drying physical properties of the silica gel core material for the honeycomb rotary dehumidifier obtained in this invention. This indicates that CO2 can regulate the properties of the silica gel adhering to the fiberglass paper. The prepared silica gel core material for the honeycomb rotary dehumidifier exhibited the best drying performance at a CO2 pressure of 0.3 MPa. At RH concentrations of 5%, 30%, and 50%, the adsorption capacities of the silica gel desiccant were 98 mg / g, 158 mg / g, and 276 mg / g, respectively, which are much higher than the adsorption capacities of the silica gel core material prepared in Comparative Example 1. Furthermore, the weight of the honeycomb fiberglass paper in Table 1 shows that the final weight of the silica gel core material for the honeycomb rotary dehumidifier obtained in this invention is 176–190 g, while the weight of the silica gel core material obtained by the traditional method is 124 g. This indicates that the amount of silica gel adhering to the silica gel core material in this invention is greater than that prepared by the traditional method. This is because silica gel easily enters the sulfuric acid solution during the traditional preparation of silica gel desiccant.

[0075] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a silica gel core material for honeycomb rotary dehumidifiers, characterized in that, Includes the following steps: Corrugated paper made from alkaline silica sol-shaped fiberglass paper is bonded to flat fiberglass paper while still wet to form a honeycomb fiberglass paper block. The honeycomb fiberglass paper block is immersed in water glass and dried to obtain a honeycomb fiberglass paper block loaded with water glass. The water glass-loaded honeycomb fiberglass paper block is placed in a sealed container, and CO2 gas is introduced from the top, maintaining the pressure of the CO2 gas between 0.1 and 0.7 MPa. The water glass on the honeycomb fiberglass paper block reacts with CO2 to form silicic acid. The silicic acid polymerizes and gels to form silica gel, thus obtaining a silica gel-loaded honeycomb fiberglass paper block. The silicone-loaded honeycomb fiberglass paper block was washed until neutral and aged in an acidic solution with a pH of 4-5 to obtain an aged honeycomb fiberglass paper block. The aged honeycomb fiberglass paper block was dried and calcined in sequence to obtain a silicone core material for honeycomb rotary dehumidification. The sequential drying and calcination process includes: sequentially performing a first drying, a first heating, a second drying, a second heating, and calcination. The temperature of the first drying is 30~50℃, and the holding time is 0.5~1.5h; the temperature of the second drying is 70~90℃, and the holding time is 0.5~1.5h; the temperature of the calcination is 160~190℃, and the holding time is 1~3h.

2. The preparation method according to claim 1, characterized in that, The preparation of the honeycomb fiberglass paper block includes: impregnating flat fiberglass paper in alkaline silica sol, hot rolling the fiberglass paper impregnated with alkaline silica sol to obtain corrugated fiberglass paper; and alternately stacking the corrugated fiberglass paper and flat fiberglass paper to obtain the honeycomb fiberglass paper block.

3. The preparation method according to claim 2, characterized in that, The concentration of the alkaline silica sol is 30-50%, and the average particle size of the silica sol particles in the alkaline silica sol is 20-40 nm.

4. The preparation method according to claim 2, characterized in that, The hot rolling temperature is 50~70℃.

5. The preparation method according to claim 1, characterized in that, The concentration of the water glass is 35-50 wt%, and the modulus is 2.0-4.

0.

6. The preparation method according to claim 1 or 5, characterized in that, The immersion time of the honeycomb fiberglass paper block in water glass is 3 to 15 minutes.

7. The preparation method according to claim 1, characterized in that, The acid solution includes a sulfuric acid solution or a hydrochloric acid solution; The aging temperature is 40~60℃ and the time is 0.5~1.5h.

8. The preparation method according to claim 1, characterized in that, The honeycomb fiberglass paper block is dried at a temperature of 45~60℃ after being immersed in water glass, until no liquid water glass flows on the surface of the honeycomb fiberglass paper block.

9. The preparation method according to claim 1, characterized in that, Introducing CO2 gas into the sealed container of the water glass-loaded honeycomb fiberglass paper block includes: placing the water glass-loaded honeycomb fiberglass paper block along the vertical direction of the honeycomb holes, and allowing CO2 gas to enter through the opening at the top of the honeycomb holes.

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