A composite material for tobacco raw material warehouse and a preparation method and application thereof

Abstract

The application discloses a kind of tobacco raw material warehouse composite material and its preparation method and application, it is related to corrosion-resistant material technical field.The composite material in the application includes the following weight parts of raw materials: polyurea resin 80-150 parts, solvent 100-150 parts, modifier 3-10 parts, modified epoxy resin 5-15 parts.The composite material in the application has strong adhesion, tensile strength, tear strength and elongation rate in addition to wall body, in particular, the composite material also has lower permeability coefficient and water vapor transmission rate, the lower water vapor transmission rate and permeability coefficient value reflects that the composite material is strong denseness, so that phosphine gas can be effectively prevented to penetrate through protective coating to wall surface and cause wall body to be eroded and peeled off.In addition, after hydrochloric acid and phosphoric acid corrosion test, it also reflects that the composite material has strong chemical corrosion resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of corrosion-resistant materials, in particular to a composite material for a tobacco raw material warehouse and a preparation method and application thereof. BACKGROUND

[0002] A tobacco raw material warehouse is a special warehouse used by a tobacco production enterprise to store tobacco raw materials. Each warehouse has a large storage capacity for raw tobacco leaves and a high value of tobacco, which puts extremely high requirements on the fire alarm system in the raw material warehouse. Since tobacco raw materials usually contain some microorganisms and pests, tobacco enterprises often conduct centralized killing treatment on the microorganisms and pests remaining on the tobacco raw materials in the tobacco raw material warehouse.

[0003] Phosphide is a broad-spectrum fumigation insecticide commonly used in the tobacco industry for insecticidal treatment of tobacco raw materials. Specifically, during the insecticidal process, phosphide absorbs moisture in the air and reacts with water after fumigation, thereby producing highly toxic phosphine gas. Long-term exposure to phosphine in the warehouse walls and related facilities in the warehouse can cause the following problems:

[0004] 1) The surface of the masonry brick wall will be eroded and peeled off, and the brick wall will be eroded and cracked for a long time, affecting the integrity of the wall structure;

[0005] 2) The wall penetration corrosion cracks destroy the sealing of the wall, which may cause the insecticide to leak, reducing the concentration of the insecticide in the warehouse, and the reduction of the insecticide concentration will prolong the insecticidal period, affect the quality of the tobacco raw materials, and increase the insecticidal cost;

[0006] 3) Because of the toxic nature of the insecticide, its leakage may cause serious environmental problems such as groundwater pollution and impact on nearby people and livestock;

[0007] 4) The combined effects of wall corrosion and geological subsidence cause cracks in the warehouse roof and water leakage. Water leakage can directly cause the warehouse to completely lose its function;

[0008] 5) The electronic equipment of the built-in temperature and smoke sensing detection system of the security system in the warehouse will cause the circuit on the circuit board to be open or short-circuited due to long-term exposure to phosphine, which poses a great threat to the normal alarm and fire protection of the security system.

[0009] The above problems caused by phosphine produced by the use of phosphide for insecticidal treatment in the tobacco raw material warehouse have been a thorny problem in the industry.

[0010] In view of the problem of equipment corrosion in the warehouse due to phosphine, the prior art discloses a protection device for precise electronic alarm equipment in a phosphine-killing environment in CN105636388A. The protection device refers to the protection of optical video monitoring alarm equipment installed in a phosphine environment. However, the circuit board of the embedded type light beam type temperature and smoke fire detection system is directly exposed to the phosphine environment, and the protection device using the sealing isolation method cannot provide protection for the system. CN202637795U discloses a fire-fighting device for preventing corrosion by corrosive gas, but this device is limited to installing a tung oil protection film or a bottom plate similar to a sealed box on the surface of the protected device. The key is that the tung oil protection film and the sealed box use "glass glue" between the protected device, which is prone to aging and failure. Therefore, the fire-fighting device has no relevance or reference to the protection of the temperature and smoke fire detector circuit board described in the present invention.

[0011] In summary, the above technical solutions are all aimed at installing additional protective devices on equipment in a phosphine environment for corrosion protection. The installation of additional protective devices not only makes the installation and fixation of the original protected equipment time-consuming and laborious, but also is not suitable for embedded smoke and temperature sensing systems. On the other hand, the above technical solutions only protect optical video monitoring equipment in a phosphine environment, but have no effect on protecting the wall surface of a raw material warehouse that is in contact with phosphine and requires complete sealing. It should be noted that there is no report on the problem of wall corrosion in a tobacco raw material warehouse caused by phosphine, and the search results are completely blank.

[0012] In summary, there is no effective solution to the problem of wall surface corrosion and wall leakage in a tobacco raw material warehouse caused by phosphine in the tobacco industry at present. The roof of the raw material warehouse is corroded by phosphine, the structure of the warehouse changes, and the geological subsidence causes the roof to leak, which has to face the problem of downtime caused by frequent maintenance. At the same time, there is no effective protection measure for the prevention of corrosion of the existing numerous embedded temperature and smoke detection systems in the raw material warehouse of most tobacco production enterprises. SUMMARY

[0013] Therefore, the purpose of the present invention is to provide a composite material for a tobacco raw material warehouse, which has good density and chemical corrosion resistance, and can effectively resist the corrosion of the wall surface of the tobacco raw material warehouse and the corrosion of the security system used in the tobacco raw material warehouse caused by phosphine.

[0014] The tobacco raw material warehouse composite material comprises the following raw materials in parts by weight: polyurea resin 80-150 parts, solvent 100-150 parts, modifier 3-10 parts, and modified epoxy resin 5-15 parts.

[0015] Preferably, the polyurea resin is at least one of polycaprolactam, polyurethane imide, polypropylene urea, polyurea amide, and aspartic polyurea resin.

[0016] Preferably, the preparation method of the modified epoxy resin comprises the following steps:

[0017] (1) 80-95 parts by weight of epoxy resin, 5-15 parts by weight of curing agent, and 5-10 parts of modifier are mixed and placed in water, stirred, and then 2-10 parts by weight of surfactant is added to form a water-in-oil emulsion in water;

[0018] (2) 0.5-1.5 wt% of urea is added to the water-in-oil emulsion, then 1-3 wt% of formaldehyde is added dropwise, the pH is adjusted to 6, heated to 60-70°C, and reacted for 1-2 hours;

[0019] (3) cooling, centrifugation, washing, and drying.

[0020] Preferably, the epoxy resin in step (1) is bisphenol A type epoxy resin; the curing agent is di-sec-butylamine; and the surfactant is Tween 80.

[0021] Preferably, the solvent is composed of acetone and ethyl acetate in a mass ratio of 2-10:5-10.

[0022] Preferably, the modifier is composed of hydroxyapatite and silicon powder in a mass ratio of 1-5:1-5.

[0023] More preferably, the particle size of the silicon powder is 10-70 nm; and the particle size of the hydroxyapatite is 80-200 nm.

[0024] Another object of the present application is to provide a preparation method of the tobacco raw material warehouse composite material, comprising the following steps:

[0025] S1, raw materials are weighed according to the proportion;

[0026] S2, the polyurea resin is poured into the solvent, and continuous stirring is performed until complete dissolution to form a uniform solution;

[0027] S3, the modifier is added to the solution obtained in step S2, and continuous stirring is performed to obtain a mixed solution;

[0028] S4, the modified epoxy resin is added to the mixed solution obtained in step S3, and continuous stirring is performed until the mixture is uniform;

[0029] S5, defoaming treatment is conducted on the mixed solution in step S4, thereby obtaining the composite material for tobacco raw material warehouse.

[0030] In the specific preparation process of the present application, the modifier hydroxyapatite and silicon powder need to be pre-dispersed and mixed by using an ultrasonic disperser.

[0031] The present application also provides a use of the composite material for tobacco raw material warehouse in corrosion prevention in the warehouse, and the composite material can be used for corrosion prevention of the surface of warehouse wall or the circuit board of security and protection system.

[0032] Preferably, the use of the composite material for tobacco raw material warehouse in corrosion prevention in the warehouse comprises the following steps:

[0033] i) first, the surface of warehouse wall or the surface of circuit board of security and protection system is cleaned to remove dust and oil stains;

[0034] ii) the composite material is heated to 70-75 DEG C and then coated on the surface of warehouse wall or the surface of circuit board of security and protection system;

[0035] iii) after the coating construction is completed, the maintenance is carried out at room temperature for more than 48 hours.

[0036] Preferably, the environment temperature is above 10 DEG C and the relative humidity is below 85% during the coating in step ii).

[0037] Preferably, the coating in step ii) is carried out by spraying or brushing, and the coating thickness of the surface of warehouse wall is 1.5-2.0 mm, and the coating thickness of the surface of circuit board of security and protection system is 200-300 microns.

[0038] The composite material in the present application has the performance of chemical corrosion resistance, and the specific principle is as follows:

[0039] The key points of the preparation of the composite material in the present application are that the polyurea resin is modified on one hand, and the epoxy resin is modified on the other hand.

[0040] Specifically, when the epoxy resin is modified, the modifier composed of powdered hydroxyapatite and silicon powder is added, and part of the silicon powder enters the gap structure of the hydroxyapatite during the stirring process, and the performance of chemical corrosion resistance of the epoxy resin can be improved by modifying the epoxy resin by using the above treatment method.

[0041] Specifically, when the polyurea resin as the main base material is modified, the base material polyurea resin is dissolved by using solvents acetone and ethyl acetate, the modifier and the modified epoxy resin are continuously added in the dissolved solution, and the modification of the polyurea resin is realized in the process.

[0042] In the modification process of the polyurea resin, the modifier hydroxyapatite and the silicon powder are first mixed by dispersion, wherein the dispersion mixing not only makes the powdered hydroxyapatite and the silicon powder partially dispersed, but also makes the partially dispersed silicon powder enter the gap structure of the hydroxyapatite, thereby realizing the mixing of the two. The operation of dispersion mixing not only makes the hydroxyapatite and the silicon powder dispersed as much as possible, but also fills the gap structure of the hydroxyapatite with the silicon powder as much as possible in the process of dispersion. The composite material prepared by using the modified epoxy resin and the modified polyurea resin significantly improves the chemical corrosion resistance of the composite material.

[0043] Compared with the prior art, the present application has the following beneficial effects:

[0044] 1、The composite material in the present application has not only strong adhesion to the wall body, excellent tensile strength, tear strength and elongation, but also particularly low permeability coefficient, and the low permeability coefficient value reflects the strong compactness of the composite material, thereby effectively preventing phosphine gas from penetrating into the wall surface and causing the wall body to be corroded and peeled off.

[0045] 2、The composite material in the present application also has strong chemical corrosion resistance. In the hydrochloric acid resistance test, the color is still stable after more than 72 hours of corrosion resistance under the condition of 15% concentration and 60℃ temperature; and in the immersion medium is phosphoric acid, the concentration is 30%, the temperature is 40℃, the color is still stable after 90 days of test, which shows strong chemical corrosion resistance.

[0046] 3、The final product of the composite material is detected according to the ISO11890-1 / ASTM D-1259 standard, and the volatile organic compound content is 0%, so it is environmentally friendly, and there is no odor or harmful substances penetrating into the tobacco raw material to affect the quality of tobacco. DETAILED DESCRIPTION

[0047] The present application will be further described below in combination with examples.

[0048] Example 1

[0049] A preparation method of a composite material for a tobacco raw material warehouse, comprising the following steps:

[0050] Step one: preparation of modified epoxy resin, comprising the following steps:

[0051] (1) 90 parts by weight of bisphenol A type epoxy resin (DGEBA) is mixed with 10 parts by weight of curing agent di-sec-butylamine (DMDA) and 10 parts by weight of modifier in water, stirred, and then 5 parts by weight of surfactant Tween 80 is added in water to form a water-in-oil emulsion; the modifier is composed of hydroxyapatite and silicon powder in a mass ratio of 1:1;

[0052] (2) 1.0 wt% of urea is added to the water-in-oil emulsion, then 2 wt% of formaldehyde is added dropwise, hydrochloric acid solution is added to adjust the pH to 6, heated to 60°C, and reacted for 1.5 hours;

[0053] (3) cooling, centrifugation, washing and drying.

[0054] Step two: preparation of a composite material for tobacco raw material warehouse, the steps are as follows:

[0055] S1, 40g of acetone and 60g of ethyl acetate are mixed uniformly to obtain a solvent; 3g of powdered hydroxyapatite and 5g of silicon powder are pre-dispersed and mixed using an ultrasonic disperser to obtain a modifier; then 120g of polyurea resin (polycaprolactam) and 15g of the modified epoxy resin prepared in step one are weighed and prepared;

[0056] S2, pour the polyurea resin into the solvent and continue to stir until it is completely dissolved to form a uniform solution;

[0057] S3, add the modifier to the solution obtained in step S2 and continue to stir to obtain a mixture;

[0058] S4, add the modified epoxy resin to the mixture obtained in step S3 and continue to stir until it is uniformly mixed;

[0059] S5, the uniformly mixed solution in step S4 is subjected to defoaming treatment (defoaming is carried out by conventional methods in the art), and a composite material for tobacco raw material warehouse is obtained.

[0060] Example 2

[0061] A method for preparing a composite material for tobacco raw material warehouse, the steps are as follows:

[0062] Step one: preparation of a modified epoxy resin, the steps are as follows:

[0063] (1) 85 parts by weight of bisphenol A type epoxy resin (DGEBA) is mixed with 15 parts by weight of curing agent di-sec-butylamine (DMDA) and 8 parts by weight of modifier in water, stirred, and then 4 parts by weight of surfactant Tween 80 is added in water to form a water-in-oil emulsion; the modifier is composed of hydroxyapatite and silicon powder in a mass ratio of 2:1;

[0064] (2) Adding 1.0 wt% urea to the water-in-oil emulsion, then adding 2 wt% formaldehyde dropwise, adjusting the pH to 6 by adding hydrochloric acid solution, heating to 65°C, and reacting for 2 hours;

[0065] (3) Cooling, centrifugation, washing, and drying to obtain the product.

[0066] Step two: Preparation of the composite material for tobacco raw material warehouse, the steps are as follows:

[0067] S1, uniformly mixing 50 g of acetone and 50 g of ethyl acetate to obtain a solvent; using an ultrasonic disperser to pre-disperse and mix 5 g of powdered hydroxyapatite and 5 g of silicon powder to obtain a modifier; then weighing 80 g of polyurea resin (polycaprolactam) and 10 g of the modified epoxy resin prepared in step one, and reserving;

[0068] S2-S6 are the same as in Example 1.

[0069] Example 3

[0070] A method for preparing a composite material for a tobacco raw material warehouse, the steps are as follows:

[0071] Step one: Preparation of the modified epoxy resin, the steps are as follows:

[0072] (1) Mixing 88 parts by weight of bisphenol A type epoxy resin (DGEBA), 12 parts by weight of curing agent di-sec-butylamine (DMDA), and 6 parts by weight of accelerator in water, stirring, then adding 5 parts by weight of surfactant Tween 80 in water to form a water-in-oil emulsion; the modifier is composed of hydroxyapatite and silicon powder in a mass ratio of 1:1;

[0073] (2) Adding 1.0 wt% urea to the water-in-oil emulsion, then adding 2 wt% formaldehyde dropwise, adjusting the pH to 6 by adding hydrochloric acid solution, heating to 60°C, and reacting for 1.5 hours;

[0074] (3) Cooling, centrifugation, washing, and drying to obtain the product.

[0075] Step two: Preparation of the composite material for tobacco raw material warehouse, the steps are as follows:

[0076] S1, uniformly mixing 60 g of acetone and 90 g of ethyl acetate to obtain a solvent; using an ultrasonic disperser to pre-disperse and mix 1 g of powdered hydroxyapatite and 2 g of silicon powder to obtain a modifier; then weighing 150 g of polyurea resin and 12 g of the modified epoxy resin prepared in step one, and reserving;

[0077] S2-S6 are the same as in Example 1.

[0078] Comparative Example 1

[0079] The difference between Comparative Example 1 and Example 1 is that no modifier consisting of hydroxyapatite and silicon powder is added in the preparation process of modified epoxy resin in Step 1, and the rest is the same.

[0080] Comparative Example 2

[0081] The difference between Comparative Example 2 and Example 1 is that no modifier consisting of hydroxyapatite and silicon powder is added in the preparation process of composite material in Step 2, and the rest is the same (a modifier consisting of hydroxyapatite and silicon powder is added in the preparation process of modified epoxy resin).

[0082] Comparative Example 3

[0083] The difference between Comparative Example 3 and Example 1 is that only a modifier consisting of single hydroxyapatite (10 parts by weight) is added in the preparation process of modified epoxy resin in Step 1 and composite material in Step 2, and the rest is the same.

[0084] Comparative Example 4

[0085] The difference between Comparative Example 4 and Example 1 is that only a modifier consisting of single silicon powder (10 parts by weight) is added in the preparation process of modified epoxy resin in Step 1 and composite material in Step 2, and the rest is the same.

[0086] Comparative Example 5

[0087] The difference between Comparative Example 5 and Example 1 is that no modifier is added in the preparation process of modified epoxy resin in Step 1 and composite material in Step 2.

[0088] Comparative Example 6

[0089] The difference between Comparative Example 6 and Example 1 is that nano-zinc oxide is used to replace silicon powder in the preparation process of modified epoxy resin in Step 1 and composite material in Step 2, and the rest is the same.

[0090] The tobacco raw material warehouse composite materials prepared in Examples 1-3 and Comparative Examples 1-6 are tested for performance, and the detection standards are as follows: hardness according to ISO 868-2003 / ASTM D-2240; tensile strength and elongation according to ISO 37-2005 / ASTM D-638; adhesion according to DIN EN ISO 4624 / ASTM D-4541; permeability coefficient according to ISO 15106-3:2003.

[0091] The results are shown in Table 1 below:

[0092] Table 1 Performance Comparison of Different Examples and Comparative Examples

[0093]

[0094] The composite materials prepared in Examples 1-3 and Comparative Examples 1-5 were subjected to hydrochloric acid corrosion resistance performance test according to the standard of DIN ISO 1817-2016, and the results are shown in Table 2:

[0095] Table 2 Hydrochloric acid resistance performance test of different examples and comparative examples

[0096]

[0097] The composite materials prepared in Examples 1-3 and Comparative Example 6 were subjected to phosphoric acid solution immersion test according to the standard of DIN ISO 1817-2016, and the results are shown in Table 3:

[0098] Table 3 Phosphoric acid immersion resistance performance test of different examples and comparative examples

[0099]

[0100] As can be seen from Table 1, the composite material prepared by the present application has strong adhesion, tensile strength, tear strength and elongation in terms of basic performance, and has low permeability coefficient and water vapor transmission rate. The water vapor transmission rate and the permeability coefficient reflect the performance of the medium penetrating through the test material. The greater the value, the easier it penetrates through. For corrosion resistance, the easier the medium penetrates through the composite material protective coating, the worse the protective performance of the coating on the protected object. This can also be verified from the tests in Tables 2 and 3.

[0101] The hydrochloric acid corrosion resistance performance test and the phosphoric acid immersion test in Tables 2 and 3 fully demonstrate that the composite material prepared by the method in the present application has significantly improved chemical corrosion resistance compared to the composite material prepared without modification. Further, from the comparison values, it can be seen that using a single hydroxyapatite or a single silicon powder as a modifier does not have the performance of improving the chemical corrosion resistance of the composite material. At the same time, it can also be seen that the composite material prepared by only modifying the epoxy resin or only modifying the polyurea resin has much poorer chemical corrosion resistance than the composite material prepared by modifying both the epoxy resin and the polyurea resin.

[0102] In addition, it can also be seen from Table 1, Table 2 and Table 3 that, when the silicon powder in the modifier is replaced by nano zinc oxide, the rest of the modification process is normal, the composite material obtained in Comparative Example 6 has some performance improvements compared with Comparative Examples 1-5, such as water vapor permeability and permeability coefficient indicators are better than Comparative Examples 1-5, but it still has a large gap with Example 1, the possible reason is that the nano zinc oxide agglomerates and cannot fully intervene into the voids of hydroxyapatite for filling; further, the composite material obtained in Comparative Example 6 also has good chemical corrosion resistance in the hydrochloric acid and phosphoric acid corrosion resistance test, but in the 90-day hydrochloric acid and phosphoric acid corrosion resistance test, the color changes slightly and the weight changes greatly, so it is not recommended for use in tobacco raw material warehouses.

[0103] Example 5

[0104] The composite material prepared in Example 1 was applied to the circuit board of a linear beam smoke fire detector for phosphine corrosion resistance, and two groups of blank control and composite material of Comparative Example 1 were set as control groups.

[0105] Specifically, the circuit board was first coated with the composite material prepared in Example 1 according to the following steps:

[0106] i) Fix the circuit board horizontally on the clamp, clean the surface of the circuit board with a brush or an electric hair dryer to remove dust and oil stains;

[0107] ii) Temporarily isolate the components and circuits that do not need to be protected from corrosion with oil paper;

[0108] iii) Uniformly brush the composite material on the circuits that need to be protected on the circuit board with a brush, and the coating thickness is 200-300 μm;

[0109] iv) During brushing, the construction is carried out indoors, the room temperature is 10-35℃, and the relative humidity is 50-85%;

[0110] v) After brushing is completed, the circuit board is cured at room temperature for 72 hours.

[0111] The linear beam smoke fire detector circuit board coated with the composite material was placed in a phosphine environment warehouse for fumigation, the fumigation test period was 1 month, and the maximum concentration of phosphine during fumigation was 1000 ppm. After 1 month, the circuit board was taken out for appearance inspection, and the function test was carried out after installation. The test results show that the circuit board coated with the composite material of Example 1 has completely normal function, while the blank control group and the circuit board coated with the composite material of Comparative Example 1 both have different degrees of functional failure.

[0112] The above is only the preferred embodiment of the present application. It should be noted that for those skilled in the art, ordinary polyurea materials available on the market or materials with similar properties modified and decorated on ordinary polyurea materials can also be used to achieve the same effect without departing from the principles of the present application. The use of ordinary polyurea materials or modified and decorated polyurea materials should also be considered within the scope of protection of the present application.

Claims

1. Use of a composite material for tobacco raw material warehouses for corrosion protection in a tobacco raw material warehouse, characterized in that The composite material can be used for anti-corrosion of warehouse wall surface or security system circuit board, and the composite material for tobacco raw material warehouse comprises the following raw materials in parts by weight: polyurea resin 80-150 parts, solvent 100-150 parts, modifier 3-10 parts, and modified epoxy resin 5-15 parts. The modifier is composed of hydroxyapatite and silicon powder in a mass ratio of 1-5:1-5; the hydroxyapatite and silicon powder need to be pre-dispersed and mixed by using an ultrasonic disperser; The preparation method of the modified epoxy resin comprises the following steps: (1) mixing 80-95 parts by weight of epoxy resin, 5-15 parts by weight of curing agent, and 5-10 parts of modifier in water, stirring, then adding 2-10 parts by weight of surfactant in water to form water-in-oil emulsion; (2) adding 0.5-1.5wt% of urea to the water-in-oil emulsion, then adding 1-3wt% of formaldehyde dropwise, adjusting the pH to 6, heating to 60-70℃, and reacting for 1-2 hours; (3) cooling, centrifuging, washing, and drying to obtain the product; The epoxy resin in step (1) is bisphenol A type epoxy resin; the curing agent is di-sec-butylamine; and the surfactant is Tween 80; The modifier is composed of hydroxyapatite and silicon powder in a mass ratio of 1-5:1-5; The particle size of the silicon powder is 10-70nm; the particle size of the hydroxyapatite is 80-200nm; and the preparation method of the composite material for tobacco raw material warehouse comprises the following steps: S1, weighing the raw materials according to the proportion; S2, pouring the polyurea resin into the solvent, continuously stirring until completely dissolved to form a uniform solution; S3, adding the modifier to the solution obtained in step S2, continuously stirring to obtain a mixed solution; S4, adding the modified epoxy resin to the mixed solution obtained in step S3, continuously stirring until uniformly mixed; S5, defoaming the uniformly mixed solution in step S4 to obtain the composite material for tobacco raw material warehouse.

2. The use of the composite material for tobacco raw material warehouses according to claim 1 for corrosion protection in a tobacco raw material warehouse, characterized in that, The polyurea resin is at least one of poly-caprolactam, polyurethane imide, polypropylene urea, polyurea amide, and aspartic polyurea resin.

3. The use of the composite material for tobacco raw material warehouses according to claim 1 for corrosion protection in a tobacco raw material warehouse, characterized in that, The solvent is composed of acetone and ethyl acetate in a mass ratio of 2-10:5-10.

4. The use of the composite material for tobacco raw material warehouses according to claim 1 for corrosion protection in a tobacco raw material warehouse, characterized in that, The composite material can be used for anti-corrosion of warehouse wall surface or security system circuit board; The application of the composite material for tobacco raw material warehouse in anti-corrosion of tobacco raw material warehouse comprises the following steps: i) first cleaning the surface of the warehouse wall or the surface of the security system circuit board to remove dust and oil stains; ii) coating the composite material on the surface of the warehouse wall or the surface of the security system circuit board after heating to 70-75℃; iii) after the coating construction is completed, curing at room temperature for more than 48 hours.

5. The use of the composite material for tobacco raw material warehouses according to claim 4, characterized in that, The environment temperature during coating in step ii) is above 10℃, and the relative humidity is below 85%; The coating is performed by spraying or brushing, the coating thickness of the warehouse wall surface is 1.5-2.0mm, and the coating thickness of the security system circuit board surface is 200-300μm.

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