Efficient short-process production system and method for allochroic silicagel

Abstract

The invention discloses an efficient short-process production system and method for allochroic silicagel, a dip dyeing process is divided into two-stage dip dyeing, so that the color is uniform, stable and controllable in the dip dyeing process, the amount of dye liquor in a dip dyeing tank is equivalently controlled, the consumption of dye added in the dip dyeing process can be the same every time, and the efficiency is high. And the residual primary dye liquor and secondary dye liquor can be recycled, so that the dip dyeing is uniform, stable and controllable, and finally the allochroic silicagel with stable quality is obtained. The traditional manual dip dyeing liquid stirring and one-time dip dyeing mode is cancelled, so that the dip dyeing process is automatic and unmanned. The dip dyeing tank adopts a conical bottom structure, and a pore plate filter layer is arranged at the bottom of the dip dyeing tank, so that the dye liquor can be completely separated from the color-changing dip dyeing glue after dip dyeing is finished, and the dye liquor on the surface of the color-changing dip dyeing glue does not remain or accumulate. And the dye adsorbed in the color-changing dip dyeing glue is uniformly distributed, so that the obtained color-changing silica gel is uniform in color and does not generate different-color glue.

Description

Technical Field

[0001] The invention relates to the field of silica gel production, and in particular to a high-efficiency short-process production system and method for color-changing silica gel. Background Art

[0002] Silica gel desiccant has a transparent or translucent glass appearance. Its main component is silicon dioxide. Its chemical formula is mSiO2·nH2O. It is insoluble in water and any solvents. It is non-toxic and tasteless. Its chemical properties are stable. It does not react with any substance except strong alkali and hydrofluoric acid. The production process of silica gel desiccant mainly includes the use of sodium silicate and sulfuric acid for synthesis reaction, and then a series of processes such as aging, acid soaking, washing, drying, and screening. The color-changing silica gel uses silica gel as the raw material, and is mainly made through processes such as impregnation and drying. It is divided into cobalt-containing color-changing silica gel and cobalt-free color-changing silica gel. The finished colors of common color-changing silica gel are mainly blue and orange. It gradually absorbs moisture in the air and presents a gradually changing color. There are many products on the market with different colors after moisture absorption, which can indicate changes in air humidity and can be reused after heating and regeneration. Cobalt-containing color-changing silica gel is often not strictly controlled during the production process. The backward production technology is used. The cobalt content of the cobalt-containing color-changing silica gel produced is high. When the cobalt content is higher than a certain range, it will produce toxicity and pose a safety hazard. Therefore, the cobalt content needs to be strictly controlled within a reasonable range. Cobalt-free color-changing silica gel mainly uses organic dyes as color-changing agents. Since it is non-toxic, it is also widely produced and used.

[0003] The new blue color-changing indicator and its production method with application number CN200510044579.2, and the preparation method of a color-changing silica gel desiccant with application number CN201811250573.4 and the color-changing silica gel obtained therefrom, all adopt a one-step method to impregnate the cobalt-free dyeing liquid, and there is no recycling of the dyeing liquid in the production process, which will cause environmental problems in wastewater treatment. The humidity indicator with application number CN200910039116.5 and its preparation method use bromine salt and cobalt salt as dyeing agents, wherein the concentration of cobalt salt in the dyeing liquid is relatively high, and the obtained cobalt-containing color-changing silica gel has a high cobalt content, which poses a safety risk.

[0004] In order to achieve stable and uniform product color, common color-changing silica gel often uses excessive dyes and simple equipment for dyeing, and the dyeing liquid is not completely filtered out after dyeing, resulting in uneven color appearance of the product and after moisture absorption, making it difficult to achieve large-scale production. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a highly efficient short-process production system and method for color-changing silica gel.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0007] In a first aspect, the present invention provides a high-efficiency short-process production system for color-changing silica gel, comprising a primary preparation tank, a secondary preparation tank, an impregnation tank, a perforated plate filter layer and a drying vehicle, wherein the primary preparation tank is provided with a first feed pipe, a first-stage dye feeding port, a third feed pipe and a first discharge pipe, the first feed pipe is used for replenishing water, the first-stage dye feeding port is used for conveying a first dye, the third feed pipe is used for conveying a first circulating liquid, the first discharge pipe is provided with a primary preparation pump, the third feed pipe is connected with the first discharge pipe, the primary preparation tank is used for preparing the first dye with the first circulating liquid and water to obtain a primary dye solution; the secondary preparation tank has a second feed pipe, a second-stage dye feeding port, a fourth feed pipe and a second discharge pipe, the second feed pipe is used for replenishing water, the second-stage dye feeding port is used for conveying a second dye, the fourth feed pipe is used for conveying a second circulating liquid, the second discharge pipe is provided with a secondary preparation pump, the fourth feed pipe is connected with the second discharge pipe, the secondary preparation tank is used for preparing the second dye with the second circulating liquid and water to obtain a secondary dye solution;

[0008] The impregnation tank is connected to the first discharge pipe and the second discharge pipe respectively, so that the primary dye liquid and the secondary dye liquid are fully mixed in the impregnation tank. The impregnation tank is also provided with a fifth feed pipe, a sixth feed pipe, a third discharge pipe and a fourth discharge pipe. The bottom of the impregnation tank is a conical structure. The fifth feed pipe is used to convey the silica gel raw material, the sixth feed pipe is used to convey the compressed air, the third discharge pipe is used to re-convey the third circulating liquid in the impregnation tank to the impregnation tank, the third discharge pipe is also provided with an impregnation pump, and the fourth discharge pipe is used to convey the color-changing impregnation glue after impregnation; the orifice plate filter layer is arranged at the bottom of the impregnation tank, the orifice plate filter layer is provided with evenly distributed circular filter holes, each of which has a diameter of 0.5 to 1.0 mm, or the orifice plate filter layer is provided with evenly distributed strip filter holes, each of which has a width of 0.5 to 1.0 mm; the drying vehicle is connected to the fourth discharge pipe, and the drying vehicle is used to convey the color-changing impregnation glue to the drying room for drying to obtain the color-changing silica gel.

[0009] In some embodiments, it also includes a first valve, a first feeding cover, a second valve, a third valve, a fourth valve, a fifth valve, a second feeding cover, a seventh valve, an eighth valve, a ninth valve, a tenth valve, a first interlocking timer and a second interlocking timer; the first valve is arranged at the first feed pipe; the first feeding cover is arranged at the first-level dye feeding port; the second valve is arranged at the third feed pipe; the third valve is arranged at the first discharge pipe; the fourth valve is arranged at the second feed pipe; the second feeding cover is arranged at the second-level dye feeding port; the fifth valve is arranged at the fourth feed pipe; the sixth valve is arranged at the second discharge pipe; the seventh valve is arranged at the fifth feed pipe; the eighth valve is arranged at the sixth feed pipe; the ninth valve is arranged at the third discharge pipe; the tenth valve is arranged at the fourth discharge pipe; the first interlocking timer is arranged on the dyeing pump; the second interlocking timer is arranged on the eighth valve.

[0010] In a second aspect, the present invention further provides an efficient short-process production method of color-changing silica gel, which is applicable to the production system described in the first aspect, wherein the color-changing impregnated gel includes a primary impregnated gel and a secondary impregnated gel, and the method comprises:

[0011] S1, adding a first preset mass of a first dye to a primary preparation tank, adding water to the primary preparation tank to reach a first liquid level, opening a first discharge pipe and a third feed pipe, so that the first dye is fully dissolved and mixed with a first circulating liquid and water for 30 to 60 minutes, to obtain a primary dye solution; and adding a second preset mass of a second dye to a secondary preparation tank, adding water to the secondary preparation tank to reach a second liquid level, opening a second discharge pipe and a fourth feed pipe, so that the second dye is fully dissolved and mixed with a second circulating liquid and water for 30 to 60 minutes, to obtain a secondary dye solution;

[0012] S2, open the primary preparation pump, close the third feed pipe, control the first discharge pipe to pump the primary dye solution into the dyeing tank, and control the fifth feed pipe to transport the third preset mass of silica gel raw material into the dyeing tank;

[0013] S3, controlling the dyeing pump to intermittently circulate the primary dye solution in the dyeing tank, and controlling the sixth feed pipe in the dyeing tank to intermittently deliver compressed air;

[0014] S4, repeat step S3 until 30-120 minutes, obtain the primary dyeing glue, turn off the dyeing pump, filter and separate the primary dye liquid in the dyeing tank to obtain the first circulating liquid, and transport all the first circulating liquid to the primary preparation tank;

[0015] S5, open the secondary preparation pump, close the fourth feed pipe, and control the second discharge pipe to pump the secondary dye solution into the dyeing tank;

[0016] S6, controlling the dyeing pump to intermittently circulate the secondary dye solution in the dyeing tank, and controlling the sixth feed pipe to intermittently deliver compressed air in the dyeing tank;

[0017] S7, repeat step S6 until 10-20 hours, obtain the secondary dyeing glue, turn off the dyeing pump, filter and separate the secondary dye liquid in the dyeing tank to obtain the second circulating liquid, and transport all the second circulating liquid to the secondary preparation tank;

[0018] S8, opening the fourth discharging pipe to transport the color-changing dip-dyeing glue in the dip-dyeing tank to the drying vehicle;

[0019] S9, placing the drying vehicle in the drying room, setting the drying temperature to 100-150° C., drying the secondary impregnated glue to a water content of less than 5%, and cooling it to a preferred temperature of 65-85° C. to obtain color-changing silica gel.

[0020] In some embodiments, the first dye is an organic dye, and the second dye is an inorganic dye; the first dye contains one or more of red ink, acid red, and basic red; the second dye contains one or more of a soluble cobalt compound, ammonium carbonate, ammonium chloride, ferric chloride, cupric chloride, ferric sulfate, and cupric sulfate; the mass concentration of the soluble cobalt compound in the secondary dye solution is 0.1-1%, and the soluble cobalt compound is one of cobalt sulfate, cobalt chloride, and cobalt nitrate.

[0021] In some embodiments, the first dye is an inorganic dye, and the second dye is an organic dye; the first dye is sulfuric acid, and the preferred primary dye solution has a sulfuric acid mass concentration of 2-5%; the second dye contains one or more of methyl violet, methyl orange, methyl red, neutral red, Congo red, gentian violet, litmus, bromophenol blue, bromothymol blue, and thymol blue.

[0022] In some embodiments, the silica gel raw material is obtained by the following steps:

[0023] Place silica gel desiccant with a water content of 10% in a desiccator with a relative humidity of 50-90% to allow the silica gel desiccant to naturally absorb water until the water content is saturated.

[0024] In some embodiments, the silica gel desiccant is granular silica gel, and the granular silica gel is spherical or irregular in shape.

[0025] In some embodiments, the particle size of the granular silica gel is one of 1-2 mm, 1-3 mm, 2-4 mm, 3-5 mm, and 4-8 mm.

[0026] In some embodiments, the mass ratio of the primary dye liquid to the silica gel raw material in the dipping tank is 0.8-1.5, the liquid level of the primary dye liquid is higher than the material level of the silica gel raw material, and the material level difference between the liquid level of the primary dye liquid and the material level of the silica gel raw material is 10-30 cm; the mass ratio of the secondary dye liquid to the silica gel raw material in the dipping tank is 0.8-1.5, the liquid level of the secondary dye liquid is higher than the material level of the silica gel raw material, and the material level difference between the liquid level of the secondary dye liquid and the material level of the silica gel raw material is 10-30 cm.

[0027] In some embodiments, the closing time of the immersion pump is recorded as the first time, the opening time of the immersion pump is recorded as the second time, and the ratio of the first time to the second time is 60:10; the closing time of the sixth feed pipe is recorded as the third time, the opening time of the sixth feed pipe is recorded as the fourth time, and the ratio of the third time to the fourth time is 60:10.

[0028] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0029] 1. In the present invention, the dyeing process is divided into two-stage dyeing, so that the color of the dyeing process is uniform, stable and controllable, the amount of dye in the dyeing tank is consistent, the dye consumption in the dyeing process can be maximized, and the remaining primary dye solution and secondary dye solution can be recycled and reused.

[0030] 2. The present invention eliminates the traditional manual stirring of the dyeing liquid, making the dyeing process automatic and unmanned.

[0031] 3. The impregnation tank of the present invention adopts a conical bottom structure, and a perforated plate filter layer is provided at the bottom, which can ensure that the dyeing liquid can be completely separated from the color-changing impregnation gel after the impregnation is completed, so that the dyeing liquid on the surface of the color-changing impregnation gel does not remain or accumulate. Since the dye adsorbed in the color-changing impregnation gel is evenly distributed, the color of the obtained color-changing silica gel is uniform, and no heterochromatic gel is produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of an efficient short-process production system for color-changing silica gel;

[0034] Figure 2 It is a schematic diagram of the orifice filter layer.

[0035] Reference numerals:

[0036] 1. Primary preparation tank;

[0037] 101, first feed pipe; 102, first-stage dye feeding port; 103, third feed pipe; 104, first discharge pipe; 105, first-stage preparation pump;

[0038] 2. Secondary preparation tank;

[0039] 201, second feed pipe; 202, second dye feeding port; 203, fourth feed pipe; 204, second discharge pipe; 205, secondary preparation pump;

[0040] 3. Dip-dyeing tank;

[0041] 301, fifth feed pipe; 302, sixth feed pipe; 303, third discharge pipe; 304, fourth discharge pipe; 305, fifth discharge pipe; 306, sixth discharge pipe; 307, immersion pump; 308, orifice filter layer;

[0042] 4. Drying car;

[0043] 5. Drying room;

[0044] 6. Dehumidifier;

[0045] 701, the first valve; 702, the first feeding cover plate; 703, the second valve; 704, the third valve; 705, the fourth valve; 706, the second feeding cover plate; 707, the fifth valve; 708, the sixth valve; 709, the seventh valve; 710, the eighth valve; 711, the ninth valve; 712, the tenth valve; 713, the eleventh valve; 714, the twelfth valve. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present invention, but are not intended to limit the scope of the present invention. Similarly, the following examples are only partial embodiments of the present invention rather than all embodiments, and all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0047] See also Figure 1 and Figure 2 In the first aspect, the present embodiment provides a high-efficiency short-process production system for color-changing silica gel, including a primary preparation tank 1, a secondary preparation tank 2, an impregnation tank 3, a perforated filter layer 308 and a drying vehicle 4, the primary preparation tank 1 is provided with a first feed pipe 101, a first-stage dye feeding port 102, a third feed pipe 103 and a first discharge pipe 104, the first feed pipe 101 is used for adding water, the first-stage dye feeding port 102 is used for conveying the first dye, the third feed pipe 103 is used for conveying the first circulating liquid, the first discharge pipe 104 is provided with a primary preparation pump 105, the third feed pipe 103 is connected to the first discharge pipe 104, and a The primary preparation tank 1 is used to prepare the first dye with the first circulating liquid and water to obtain the primary dye solution; the secondary preparation tank 2 has a second feed pipe 201, a second-stage dye feeding port 202, a fourth feed pipe 203 and a second discharge pipe 204, the second feed pipe 201 is used to add water, the second-stage dye feeding port 202 is used to transport the second dye, the fourth feed pipe 203 is used to transport the second circulating liquid, the second discharge pipe 204 is provided with a secondary preparation pump 205, the fourth feed pipe 203 is connected to the second discharge pipe 204, and the secondary preparation tank 2 is used to prepare the second dye with the second circulating liquid and water to obtain the secondary dye solution;

[0048] The impregnation tank 3 is connected to the first discharge pipe 104 and the second discharge pipe 204 respectively, so that the primary dye liquid and the secondary dye liquid are fully mixed in the impregnation tank 3. The impregnation tank 3 is also provided with a fifth feed pipe 301, a sixth feed pipe 302, a third discharge pipe 303 and a fourth discharge pipe 304. The bottom of the impregnation tank 3 is a conical structure. The fifth feed pipe 301 is used to transport the silica gel raw material, the sixth feed pipe 302 is used to transport compressed air, and the third discharge pipe 303 is used to transport the third circulating liquid in the impregnation tank 3 to the impregnation tank 3 again. The third discharge pipe 303 is also provided with There is a dyeing pump 307, and the fourth discharge pipe 304 is used to transport the color-changing dyeing glue after dyeing; the perforated filter layer 308 is arranged at the bottom of the dyeing tank 3, and the perforated filter layer 308 is provided with evenly distributed circular filter holes, and the diameter of each circular filter hole is 0.5-1.0 mm, or the perforated filter layer 308 is provided with evenly distributed strip filter holes, and the width of each strip filter hole is 0.5-1.0 mm; the drying car 4 is connected to the fourth discharge pipe 304, and the drying car 4 is used to transport the color-changing dyeing glue to the drying chamber 5 for drying to obtain color-changing silica gel.

[0049] In the present embodiment, the primary preparation tank 1 is used to prepare the primary dye solution. Specifically, during the preparation process, water needs to be input from the first feed pipe 101, and the corresponding first dye that has been weighed is added to the first-stage dye feeding port 102. The primary dye solution is obtained by mixing and dissolving the first dye with water and the first circulating liquid. It should be noted that the first circulating liquid is a liquid containing the first dye. The first circulating liquid can be a liquid in the process of incomplete dissolution of the first dye and water. The first circulating liquid can also be the remaining liquid after the dyeing process described later. The content of the first dye in the first circulating liquid is uncertain. It is necessary to re-add the first dye and water and re-proportion it to obtain a primary dye solution that meets the dyeing requirements. Similarly, the understanding of the second circulating liquid can also refer to this method. The second circulating liquid is a liquid containing the second dye. The use of the first circulating liquid is as follows: Figure 1 As shown, the third feed pipe 103 is connected to the first discharge pipe 104. When in use, the first discharge pipe 104 and the third feed pipe 103 are opened, and the first circulation liquid in the first preparation tank 1 is repeatedly injected into the first preparation tank 1 by the first preparation pump 105. The first circulation liquid will continuously impact the first dye that has not yet dissolved in the first preparation tank 1 under the action of inertia, so as to achieve the purpose of stirring, so that the first dye and water are fully mixed and dissolved. This process can last for 30 to 60 minutes to obtain a completely dissolved first dye solution.

[0050] Similarly, the secondary preparation tank 2 is used to prepare the secondary dye liquor. Specifically, during the preparation process, water needs to be input from the second feed pipe 201, and the corresponding second dye is added to the second dye feeding port 202, and the second dye is mixed and dissolved with water to obtain the secondary dye liquor. It should be noted that the mixing method used in this embodiment requires the use of the fourth feed pipe 203, such as Figure 1 As shown, the fourth feed pipe 203 is connected to the second discharge pipe 204. When in use, the second discharge pipe 204 and the fourth feed pipe 203 are opened, and the second circulating liquid in the secondary preparation tank 2 is repeatedly injected into the secondary preparation tank 2 by the secondary preparation pump 205. The second circulating liquid will continue to impact the undissolved second dye in the secondary preparation tank 2 under the action of inertia, so as to achieve the purpose of stirring, so that the second dye is fully mixed and dissolved with water. This process can last for 30 to 60 minutes to obtain a dissolved secondary dye solution.

[0051] Furthermore, the impregnation tank 3 is connected to the first discharge pipe 104 and the second discharge pipe 204 respectively, and the impregnation tank 3 is used to impregnate the silicone raw material. The impregnation tank 3 is provided with a fifth feed pipe 301, a sixth feed pipe 302, a third discharge pipe 303 and a fourth discharge pipe 304, wherein the fourth discharge pipe 304 is used to output the impregnated color-changing impregnation glue, and the third discharge pipe 303 is connected to the impregnation tank 3 in the following manner: Figure 1 As shown, the third discharge pipe 303 is connected from the bottom of the impregnation tank 3 to the top of the impregnation tank 3 to form a conveying loop. Correspondingly, the fifth feed pipe 301 is used to convey the silica gel raw material, and the sixth feed pipe 302 is used to input compressed air.

[0052] In this embodiment, the third discharge pipe 303 is provided with an impregnation pump 307, which is used in a circulating impregnation form to increase the flow rate of the dye liquid on the outer surface of the silicone raw material in the impregnation tank 3, thereby improving the efficiency of the dyeing elements being immersed in the silicone raw material. Further, the impregnation pump 307 is opened in an intermittent cycle, and the dye liquid in the current impregnation tank 3 is regularly pumped from the bottom to the top and re-sprayed and impregnated. Then, the third circulating liquid can be understood as the dye liquid in the current impregnation tank 3. When the impregnation tank 3 is performing a primary impregnation process, the third circulating liquid is a primary dye liquid, and when the impregnation tank 3 is performing a secondary impregnation process, the third circulating liquid is a secondary dye liquid.

[0053] It should be noted that the present embodiment adopts a two-stage dyeing method, that is, the silica gel raw material is firstly dyed with a primary dyeing liquid, and then the silica gel raw material is dyed with a secondary dyeing liquid after the dyeing is completed.

[0054] Furthermore, the present embodiment further includes a perforated plate filter layer 308, which is disposed at the bottom of the impregnation tank 3. The perforated plate filter layer 308 is provided with evenly distributed circular filter holes or strip filter holes. The silica gel raw material is restricted by the perforated plate filter layer 308 during the impregnation process and does not directly contact the bottom of the impregnation tank 3. The perforated plate filter layer 308 acts as a colander. The dye solution passes through the filter holes of the perforated plate filter layer 308 to reach the bottom of the impregnation tank 3, and is then pumped back into the impregnation tank 3 through the third discharge pipe 303, completing a cycle of the impregnation process.

[0055] In this embodiment, the drying vehicle 4 can use the existing drying vehicle 4 structure to transport the dyed color-changing impregnated glue to the corresponding drying chamber 5 for the next step. Optionally, the silica gel raw material can be obtained by placing the silica gel desiccant in the desiccant 6 for sufficient moisture absorption.

[0056] In this embodiment, the color of the dyeing process is uniform, stable and controllable by dividing the dyeing process into two-level dyeing. The amount of dye in the dyeing tank 3 is consistent, the dye consumption of the dyeing process can be maximized, and the remaining primary dyeing liquid and secondary dyeing liquid can be recycled and reused. The traditional manual stirring of the dyeing liquid is eliminated, making the dyeing process automatic and unmanned. The dyeing tank 3 adopts a conical bottom structure, and a perforated plate filter layer 308 is provided at the bottom to ensure that the dyeing liquid can be completely separated from the color-changing dyeing glue after the dyeing is completed, so that the dyeing liquid on the surface of the color-changing dyeing glue does not remain or accumulate. Since the dye adsorbed in the color-changing dyeing glue is evenly distributed, the color of the obtained color-changing silica gel is uniform and no heterochromatic glue is produced.

[0057] See also Figure 1 In some embodiments, the first valve 701, the first feeding cover plate 702, the second valve 703, the third valve 704, the fourth valve 705, the second feeding cover plate 706, the fifth valve 707, the sixth valve 708, the seventh valve 709, the eighth valve 710, the ninth valve 711, the tenth valve 712, the first interlocking timer and the second interlocking timer are also included; the first valve 701 is arranged on the first feeding pipe 101; the first feeding cover plate 702 is arranged on the first-stage dye feeding port 102; the second valve 703 is arranged on the third feeding pipe 103; the third valve 704 is arranged on the first A discharge pipe 104; a fourth valve 705 is arranged on the second feed pipe 201; a second feed cover plate 706 is arranged on the second-level dye feed port 202; a fifth valve 707 is arranged on the fourth feed pipe 203; a sixth valve 708 is arranged on the second discharge pipe 204; a seventh valve 709 is arranged on the fifth feed pipe 301; an eighth valve 710 is arranged on the sixth feed pipe 302; a ninth valve 711 is arranged on the third discharge pipe 303; a tenth valve 712 is arranged on the fourth discharge pipe 304; a first interlocking timer is arranged on the dyeing pump 307; and a second interlocking timer is arranged on the eighth valve 710.

[0058] It should be noted that, in this embodiment, different pipelines have different opening periods, and full utilization of different pipelines can be achieved through orderly combination. The primary preparation tank 1 is taken as an example for detailed description, and the secondary preparation tank 2 can be understood with reference to the primary preparation tank 1.

[0059] In the process of preparing the primary dye solution, the first valve 701 and the first feeding cover plate 702 are opened to realize the transportation of water and the first dye, and the first valve 701 and the first feeding cover plate 702 are closed after the transportation is completed. At the same time, the second valve 703 and the primary preparation pump 105 are opened, and the first circulating liquid is repeatedly input into the primary preparation tank 1 through the primary preparation pump 105, so as to realize the full dissolution of the first dye and water. After the primary dye solution is prepared, the second valve 703 is closed, and the third valve 704 is opened. The third valve 704 is arranged at the connection between the first discharge pipe 104 and the immersion and dyeing tank 3, and the first discharge pipe 104 transports the primary dye solution into the immersion and dyeing tank 3.

[0060] In some optional embodiments, the dyeing tank 3 is further provided with a fifth discharge pipe 305 and a sixth discharge pipe 306, wherein the fifth discharge pipe 305 is communicated with the first discharge pipe 104, and the sixth discharge pipe 306 is communicated with the second discharge pipe 204. An eleventh valve 713 is provided on the fifth discharge pipe 305, and a twelfth valve 714 is provided on the sixth discharge pipe 306. Similarly, the working principle of the fifth discharge pipe 305 and the eleventh valve 713 is explained by the dyeing process of the primary dye solution, and the working principle of the sixth discharge pipe 306 and the twelfth valve 714 can be understood with reference to the working principle of the fifth discharge pipe 305 and the eleventh valve 713.

[0061] After completing the primary dyeing operation of the silicone raw material in the dyeing tank 3, open the eleventh valve 713, transport the primary dye liquid from the fifth discharge pipe 305 to the first discharge pipe 104, and open the second valve 703, so that the third feed pipe 103 is connected with the fifth discharge pipe 305 and the first discharge pipe 104, then the primary dye liquid in the fifth discharge pipe 305 is transported to the primary batching tank through the third feed pipe 103 again, and the primary dye liquid in the primary batching tank can be reused when used next time. This method realizes the recycling of the primary dye liquid and reduces the production cost of dyeing.

[0062] Furthermore, in the preparation process of the impregnation tank 3, secondary impregnation is required. Under this principle, the third valve 704, the sixth valve 708, the eighth valve 710, the seventh valve 709, the ninth valve 711 and the tenth valve 712 need to be selectively opened.

[0063] Specifically, the seventh valve 709 and the third valve 704 are opened to allow the silica gel raw material and the primary dye liquid to enter the dyeing tank 3, the seventh valve 709 and the third valve 704 are closed, the eighth valve 710 and the ninth valve 711 are opened, and the first interlocking timer is started at the same time to allow the dyeing pump 307 to intermittently circulate the primary dye liquid, and the second interlocking timer is opened to allow the compressed air to be intermittently input into the dyeing tank 3. After repeating this step for a certain length of time, the ninth valve 711 and the eighth valve 710 are closed, and the eleventh valve 713 is opened to transport the primary dye liquid to the fifth discharge pipe 305, and the second valve 703 is opened to transport the primary dye liquid to the primary preparation pump 105 through the third feed pipe 103. After the primary dye liquid is discharged, the sixth valve 708 is opened to transport the secondary dye liquid to the dyeing tank 3. After the transport is completed, the sixth valve 708 is closed, the eighth valve 710 and the ninth valve 711 are opened, and the first interlocking timer is opened at the same time so that the dyeing pump 307 can intermittently circulate the primary dye liquid, and the second interlocking timer is opened so that the compressed air can be intermittently input into the dyeing tank 3. After repeating this step for a certain length of time, the ninth valve 711 and the eighth valve 710 are closed, and the twelfth valve 714 is opened to transport the secondary dye liquid to the sixth discharge pipe 306, and the fifth valve 707 is opened to transport the secondary dye liquid to the secondary preparation pump 205 using the fourth feed pipe 203. Finally, the tenth valve 712 is opened to output the color-changing dyeing glue to the drying vehicle 4, and enter the next drying process.

[0064] Optionally, the sixth discharge pipe 306 and the fifth discharge pipe 305 can be the same pipeline. Under the premise of not affecting the dyeing effect, the primary dye solution and the secondary dye solution can be transported separately through the shared pipeline, while reducing the production cost.

[0065] In a second aspect, this embodiment further provides an efficient short-process production method of color-changing silica gel, which is applicable to the production system described in the first aspect, wherein the color-changing impregnated gel includes a primary impregnated gel and a secondary impregnated gel, and the method includes:

[0066] S1, adding a first preset mass of a first dye to a primary preparation tank, adding water to the primary preparation tank to reach a first liquid level, opening a first discharge pipe and a third feed pipe, so that the first dye is fully dissolved and mixed with a first circulating liquid and water for 30 to 60 minutes, to obtain a primary dye solution; and adding a second preset mass of a second dye to a secondary preparation tank, adding water to the secondary preparation tank to reach a second liquid level, opening a second discharge pipe and a fourth feed pipe, so that the second dye is fully dissolved and mixed with a second circulating liquid and water for 30 to 60 minutes, to obtain a secondary dye solution;

[0067] S2, open the primary preparation pump, close the third feed pipe, control the first discharge pipe to pump the primary dye solution into the dyeing tank, and control the fifth feed pipe to transport the third preset mass of silica gel raw material into the dyeing tank;

[0068] S3, controlling the dyeing pump to intermittently circulate the primary dye solution in the dyeing tank, and controlling the sixth feed pipe in the dyeing tank to intermittently deliver compressed air;

[0069] S4, repeat step S3 until 30-120 minutes, obtain the primary dyeing glue, turn off the dyeing pump, filter and separate the primary dye liquid in the dyeing tank to obtain the first circulating liquid, and transport all the first circulating liquid to the primary preparation tank;

[0070] S5, open the secondary preparation pump, close the fourth feed pipe, and control the second discharge pipe to pump the secondary dye solution into the dyeing tank;

[0071] S6, controlling the dyeing pump to intermittently circulate the secondary dye solution in the dyeing tank, and controlling the sixth feed pipe to intermittently deliver compressed air in the dyeing tank;

[0072] S7, repeat step S6 until 10-20 hours, obtain the secondary dyeing glue, turn off the dyeing pump, filter and separate the secondary dye liquid in the dyeing tank to obtain the second circulating liquid, and transport all the second circulating liquid to the secondary preparation tank;

[0073] S8, opening the fourth discharging pipe to transport the color-changing dip-dyeing glue in the dip-dyeing tank to the drying vehicle;

[0074] S9, placing the drying vehicle in the drying room, setting the drying temperature to 100-150° C., drying the secondary impregnated glue to a water content of less than 5%, and cooling it to a preferred temperature of 65-85° C. to obtain color-changing silica gel.

[0075] It should be noted that the settings of the first preset mass, the second preset mass and the third preset mass can be determined according to the dyeing degree of the color-changing silica gel during the actual dyeing process, and this embodiment does not limit this.

[0076] Further, in some embodiments, the first dye is an organic dye, and the second dye is an inorganic dye; the first dye contains one or more of red ink, acid red, and basic red; the second dye contains a soluble cobalt compound, which contains one or more of ammonium carbonate, ammonium chloride, ferric chloride, copper chloride, ferric sulfate, and copper sulfate; the mass concentration of the soluble cobalt compound in the secondary dye solution is 0.1-1%, and the soluble cobalt compound is one of cobalt sulfate, cobalt chloride, and cobalt nitrate. The color-changing silica gel produced in this way is cobalt-containing color-changing silica gel.

[0077] In some embodiments, the first dye is an inorganic dye, and the second dye is an organic dye; the first dye is sulfuric acid, and the preferred mass concentration of sulfuric acid in the primary dye solution is 2-5%; the second dye contains 2-5 types of organic dyes, and the second dye contains one or more of methyl violet, methyl orange, methyl red, neutral red, Congo red, gentian violet, litmus, bromophenol blue, bromothymol blue, and thymol blue. The color-changing silica gel produced in this way is cobalt-free color-changing silica gel.

[0078] In some embodiments, the silica gel raw material is obtained by the following steps:

[0079] Place silica gel desiccant with a water content of 10% in a desiccator with a relative humidity of 50-90% to allow the silica gel desiccant to naturally absorb water until the water content is saturated.

[0080] It should be noted that the desiccant may be a common desiccant device, such as a storage basket with a humidifier, in which a silica gel desiccant is placed, and the silica gel desiccant is humidified by the humidifier.

[0081] In some embodiments, the silica gel desiccant is granular silica gel, and the granular silica gel is spherical or irregular in shape.

[0082] In some embodiments, the preferred particle size of the granular silica gel is one of 1-2 mm, 1-3 mm, 2-4 mm, 3-5 mm, and 4-8 mm.

[0083] In some embodiments, the mass ratio of the primary dye solution to the silica gel raw material in the dipping tank is 0.8-1.5, the liquid level of the primary dye solution is higher than the material level of the silica gel raw material, and the preferred material level difference is 10-30 cm; the mass ratio of the secondary dye solution to the silica gel raw material in the dipping tank is 0.8-1.5, the liquid level of the secondary dye solution is higher than the material level of the silica gel raw material, and the preferred material level difference is 10-30 cm.

[0084] In some embodiments, the closing time of the dyeing pump is the first time, and the opening time of the dyeing pump is the second time, and the preferred ratio of the first time to the second time is 60:10; the closing time of the fourth feed pipe is the third time, and the opening time of the sixth feed pipe is the fourth time, and the preferred ratio of the third time to the fourth time is 60:10.

[0085] The above embodiment has the following advantages:

[0086] 1. Load the silica gel desiccant into a desiccator equipped with a humidifier. Place the silica gel desiccant in a closed environment within the high humidity dew point to naturally absorb water until the moisture content is saturated. By controlling the silica gel desiccant to absorb moisture in a closed desiccant environment, the moisture absorption rate of the silica gel desiccant can be greatly improved. At the same time, the problem of the silica gel desiccant exploding due to direct contact with liquid moisture can be avoided, ensuring the uniformity of the appearance of the silica gel raw materials used in the production of color-changing silica gel.

[0087] 2. Dividing the dyeing process into two levels of organic dyes and inorganic dyes can ensure that the inorganic dyes and organic dyes do not interfere with each other, make full use of the principle of like dissolves like, make the color of the dyeing process uniform, stable and controllable, the amount of dye in the color-changing dyeing glue is consistent, the dye consumption in the dyeing process can be maximized, and the dye solution after dyeing can be recycled and reused.

[0088] 3. The dyeing process is controlled by the linkage of the first interlocking timer and the dyeing pump, and the linkage of the second interlocking timer and the sixth feeding pipe, which can completely eliminate the traditional manual stirring of the dyeing liquid and make the dyeing process automatic and unmanned.

[0089] 4. The dyeing tank adopts a conical bottom structure with a perforated filter layer at the bottom, which can ensure that the dye liquid can be completely separated from the color-changing dyeing glue after the dyeing is completed, so that there is no residual dye liquid or liquid accumulation on the surface of the color-changing dyeing glue. Since the dye adsorbed in the color-changing dyeing glue is evenly distributed, the color of the obtained color-changing silica gel product is uniform and no heterochromatic glue is produced.

[0090] The above technical solution divides the dyeing process into two-level dyeing, so that the color of the dyeing process is uniform, stable and controllable, the amount of dye in the dyeing tank is consistent, the dye consumption in the dyeing process can be maximized, and the remaining primary dye liquid and secondary dye liquid can be recycled and reused. The traditional manual stirring of the dyeing liquid is eliminated, making the dyeing process automated and unmanned. The dyeing tank adopts a conical bottom structure and a perforated plate filter layer at the bottom to ensure that the dye liquid can be completely separated from the color-changing dyeing gel after the dyeing is completed, so that there is no residual dye liquid or liquid accumulation on the surface of the color-changing dyeing gel. Since the dye adsorbed in the color-changing dyeing gel is evenly distributed, the color of the obtained color-changing silica gel is uniform and no heterochromatic gel is produced.

[0091] The above descriptions are only some embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any equivalent device or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An efficient short-process production system for color-changing silica gel, characterized in that: include: A primary preparation tank, wherein the primary preparation tank is provided with a first feed pipe, a first-stage dye feeding port, a third feed pipe and a first discharge pipe, wherein the first feed pipe is used for replenishing water, the first-stage dye feeding port is used for adding a first dye, the third feed pipe is used for conveying a first circulating liquid, the first discharge pipe is provided with a primary preparation pump, the third feed pipe is connected to the first discharge pipe, and the primary preparation tank is used for preparing the first dye with the first circulating liquid and water to obtain a primary dye solution; A secondary preparation tank, the secondary preparation tank having a second feed pipe, a second dye feeding port, a fourth feed pipe and a second discharge pipe, the second feed pipe is used to add water, the second dye feeding port is used to add a second dye, the fourth feed pipe is used to transport a second circulating liquid, the second discharge pipe is provided with a secondary preparation pump, the fourth feed pipe is connected to the second discharge pipe, and the secondary preparation tank is used to prepare the second dye with the second circulating liquid and water to obtain a secondary dye solution; A dyeing tank is connected to the first discharge pipe and the second discharge pipe respectively, so that the primary dyeing liquid and the secondary dyeing liquid are fully mixed in the dyeing tank. The dyeing tank is also provided with a fifth feed pipe, a sixth feed pipe, a third discharge pipe and a fourth discharge pipe. The bottom of the dyeing tank is a conical structure. The fifth feed pipe is used to transport the silica gel raw material, the sixth feed pipe is used to transport compressed air, the third discharge pipe is used to transport the third circulating liquid in the dyeing tank back to the dyeing tank, the third discharge pipe is also provided with a dyeing pump, and the fourth discharge pipe is used to transport the color-changing dyeing glue after dyeing; A perforated plate filter layer is arranged at the bottom of the impregnation tank, the perforated plate filter layer is provided with evenly distributed circular filter holes, each of which has a diameter of 0.5 to 1.0 mm, or the perforated plate filter layer is provided with evenly distributed strip filter holes, each of which has a width of 0.5 to 1.0 mm; A drying vehicle is connected to the fourth discharge pipe, and the drying vehicle is used to transport the color-changing impregnated glue to a drying room for drying to obtain color-changing silica gel.

2. The efficient short-process production system of color-changing silica gel according to claim 1 is characterized in that: Also includes: A first valve, disposed in the first feed pipe; A first feeding cover plate, arranged at the first-stage dye feeding port; a second valve, disposed on the third feed pipe; A third valve is arranged on the first discharge pipe; A fourth valve, disposed on the second feed pipe; A second feeding cover plate is arranged at the second-stage dye feeding port; A fifth valve, disposed on the fourth feed pipe; A sixth valve, disposed on the second discharge pipe; A seventh valve, disposed on the fifth feed pipe; An eighth valve, disposed on the sixth feed pipe; A ninth valve, arranged on the third discharge pipe; A tenth valve, disposed on the fourth discharge pipe; A first interlocking timer, arranged on the dyeing pump; The second interlocking timer is arranged on the eighth valve.

3. An efficient short-process production method for color-changing silica gel, characterized in that: Applicable to the production system of claim 1 or 2, the color-changing impregnated glue includes a primary impregnated glue and a secondary impregnated glue, and the method includes: S1, adding a first preset mass of a first dye to the primary preparation tank, adding water to the primary preparation tank to reach a first liquid level, opening the first discharge pipe and the third feed pipe, so that the first dye is fully dissolved and mixed with the first circulating liquid and water for 30 to 60 minutes, to obtain a primary dye solution; and adding a second preset mass of a second dye to the secondary preparation tank, adding water to the secondary preparation tank to reach a second liquid level, opening the second discharge pipe and the fourth feed pipe, so that the second dye is fully dissolved and mixed with the second circulating liquid and water for 30 to 60 minutes, to obtain a secondary dye solution; S2, opening the primary preparation pump, closing the third feed pipe, controlling the first discharge pipe to pump the primary dye solution into the dyeing tank, and controlling the fifth feed pipe to transport the third preset mass of silica gel raw material into the dyeing tank; S3, controlling the dyeing pump to intermittently circulate the primary dye solution in the dyeing tank, and controlling the sixth feed pipe to intermittently deliver compressed air in the dyeing tank; S4, repeat step S3 until 30 to 120 minutes, obtain the primary dyeing glue, turn off the dyeing pump, filter and separate the primary dye liquid in the dyeing tank to obtain the first circulating liquid, and transport all the first circulating liquid to the primary preparation tank; S5, turning on the secondary preparation pump, closing the fourth feed pipe, and controlling the second discharge pipe to pump the secondary dye solution into the dyeing tank; S6, controlling the dyeing pump to intermittently circulate the secondary dye solution in the dyeing tank, and controlling the sixth feed pipe to intermittently deliver compressed air in the dyeing tank; S7, repeat step S6 until 10 to 20 hours, obtain the secondary dyeing glue, turn off the dyeing pump, filter and separate the secondary dye liquid in the dyeing tank to obtain the second circulating liquid, and transport all the second circulating liquid to the secondary preparation tank; S8, opening the fourth discharge pipe to transport the color-changing impregnated glue in the impregnation tank to the drying vehicle; S9, placing the drying vehicle in a drying room, setting the drying temperature to 100-150° C., drying the secondary impregnated glue to a water content of less than 5%, and cooling it to 65-85° C. to obtain the color-changing silica gel.

4. The efficient short-process production method of color-changing silica gel according to claim 3, characterized in that: The first dye is an organic dye, and the second dye is an inorganic dye; The first dye contains one or more of red ink, acid red, and basic red; The second dye contains a soluble cobalt compound, which contains one or more of ammonium carbonate, ammonium chloride, ferric chloride, cupric chloride, ferric sulfate, and cupric sulfate. The mass concentration of the soluble cobalt compound in the secondary dye solution is 0.1-1%, and the soluble cobalt compound is one of cobalt sulfate, cobalt chloride, and cobalt nitrate.

5. The efficient short-process production method of color-changing silica gel according to claim 3, characterized in that: The first dye is an inorganic dye, and the second dye is an organic dye; The first dye is sulfuric acid, and the mass concentration of sulfuric acid in the primary dye solution is 2-5%; The second dye contains one or more of methyl violet, methyl orange, methyl red, neutral red, Congo red, gentian violet, litmus, bromophenol blue, bromothymol blue, and thymol blue.

6. The efficient short-process production method of color-changing silica gel according to any one of claims 3 to 5, characterized in that: The silica gel raw material is obtained by the following steps: A silica gel desiccant with a water content of 10% is placed in a desiccator with a relative humidity of 50-90% so that the silica gel desiccant can naturally absorb water until the water content is saturated.

7. The efficient short-process production method of color-changing silica gel according to claim 6, characterized in that: The silica gel desiccant is granular silica gel, and the granular silica gel is spherical or irregular in shape.

8. The efficient short-process production method of color-changing silica gel according to claim 7, characterized in that: The particle size of the granular silica gel is one of 1-2 mm, 1-3 mm, 2-4 mm, 3-5 mm, and 4-8 mm.

9. The efficient short-process production method of color-changing silica gel according to claim 8, characterized in that: The mass ratio of the primary dye solution to the silica gel raw material in the dyeing tank is 0.8-1.5, the liquid level of the primary dye solution is higher than the material level of the silica gel raw material, and the material level difference between the liquid level of the primary dye solution and the material level of the silica gel raw material is 10-30 cm; The mass ratio of the secondary dye solution in the dyeing tank to the silica gel raw material is 0.8-1.5, the liquid level of the secondary dye solution is higher than the material level of the silica gel raw material, and the difference between the liquid level of the secondary dye solution and the material level of the silica gel raw material is 10-30 cm.

10. The efficient short-process production method of color-changing silica gel according to claim 9, characterized in that: The closing time of the immersion pump is recorded as the first time, the opening time of the immersion pump is recorded as the second time, and the ratio of the first time to the second time is 60:10; The closing time of the sixth feed pipe is recorded as the third time, the opening time of the sixth feed pipe is recorded as the fourth time, and the ratio of the third time to the fourth time is 60:10.

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