Mildew-proof and moth-proof polyurethane polystyrene foam manufacturing process

Abstract

The invention relates to a mould-proof and mothproof polyurethane foaming adhesive manufacturing process which comprises the steps of prepolymer preparation, prepolymer mixture preparation, foaming agent mixture preparation, foaming forming, curing and finishing. According to the mould-proof and mothproof polyurethane foaming adhesive manufacturing process, a mould-proof agent is packaged in a silicon dioxide nanocapsule, so that the dispersity and the slow-release effect are improved; the pressure of the mixing head of the high-pressure foaming machine is increased to 20 MPa, the micron-sized dispersion effect is ensured, microwave radiation is adopted to replace a conventional curing mode, the working efficiency is improved, and the scientificity and practical value of the whole process are improved.

Description

Technical Field

[0001] The invention relates to a process for preparing mildew-proof and moth-proof polyurethane foam adhesive. Background Art

[0002] Although the existing technology for manufacturing mildew-proof and moth-proof polyurethane foam glue has functionality, there are still defects in product performance, such as uneven dispersion of additives, resulting in uneven mildew resistance, a significant decrease in protective effect after long-term use, poor dispersion of surfactants forming localized macropores, an unbalanced ratio of foaming agent to catalyst, resulting in interconnected pores, reduced thermal insulation and moisture-proof properties, a long conventional curing time, and low work efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: in order to overcome the above technical problems, the present invention provides a process for manufacturing mildew-proof and moth-proof polyurethane foam.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a process for producing mildew-proof and moth-proof polyurethane foam, comprising the following steps:

[0005] a. Preparation of prepolymer: react polyether polyol and polyisocyanate at 80-85°C for 2-3 hours, controlling the isocyanate content to 15-30%, to obtain a prepolymer, wherein the mass ratio of polyether polyol to polyisocyanate is 1:1.2-1:1.5;

[0006] b. Preparation of prepolymer mixture: adding a mildew inhibitor, a mothproofing agent and a flame retardant to the prepolymer, and mixing them uniformly by high-speed stirring to obtain a prepolymer mixture;

[0007] c. Preparation of a foaming agent mixture: adding a catalyst and a surfactant to a foaming agent, stirring and mixing to obtain a foaming agent mixture;

[0008] d. Foaming molding: Add the prepolymer mixture and the foaming agent mixture in a ratio of 1:1.1-1:1.15 into a high-pressure foaming machine for mixing, and then inject into the mold for curing molding. The foaming temperature is 20-40°C, the humidity is 40-60%, and the curing time is 5-15 minutes.

[0009] e. Curing: Curing under 2.45 GHz microwave radiation for 5 minutes;

[0010] f. Trimming: Cut off excess foam.

[0011] Furthermore, in step b, the mass ratio of the mildewproofing agent, mothproofing agent and flame retardant added to the prepolymer is 5:3:10, and the mass ratio of the polyether polyol to the mildewproofing agent is 100:1; in step c, the mass ratio of the foaming agent, catalyst and surfactant is 50:1:10.

[0012] Furthermore, the foaming agent is HFC-245fa, the catalyst includes an amine catalyst and a metal catalyst, the surfactant is L-580, the mildew inhibitor is nanosilver, the mothproofing agent is borate, and the flame retardant is TCPP.

[0013] Furthermore, in step a, the reaction is terminated by titrating the NCO content, and the NCO content is titrated by the di-n-butylamine method, and the calculation formula is: Where N is the concentration of hydrochloric acid standard solution, m is the sample mass, V 空白 is the volume of hydrochloric acid standard solution consumed in the blank test, V 样品 The volume of hydrochloric acid standard solution consumed to titrate the sample.

[0014] Furthermore, the determination method comprises the following steps:

[0015] 1) Reagent Preparation: Dissolve 130 mL of di-n-butylamine in 1 L of anhydrous toluene to obtain a di-n-butylamine solution, prepare a 0.1 mol / L hydrochloric acid standard solution, and prepare a 0.1% ethanol solution as a bromocresol green indicator.

[0016] 2) Blank test: Take 10 ml of di-n-butylamine solution and 20 ml of anhydrous toluene, add 3 drops of indicator, and titrate with hydrochloric acid until a yellow spot appears. Record the volume V 空白 ;

[0017] 3) Sample determination: Accurately weigh the prepolymer sample, about 0.5-1 g, add 10 ml of di-n-butylamine solution, shake well and let it stand for 15 minutes. After the NCO is completely reacted, add 20 ml of anhydrous toluene and 3 drops of indicator, titrate with hydrochloric acid to a yellow focus, and record the volume V 样品 ;

[0018] 4) Calculation: Calculate the NCO content using the formula.

[0019] Furthermore, in step b, the step of preparing the prepolymer mixture includes:

[0020] b1. Material pretreatment: vacuum dehydrating the mildewcide, mothproofing agent, and flame retardant at 80°C for 2 hours. Grinding the mildewcide to a particle size of less than 50 μm, and encapsulating the mildewcide particles in silica nanocapsules.

[0021] b2. Material premixing: Heat the prepolymer to 50°C, then place it in the dispersant, add the flame retardant, and stir at a low speed of 300 rpm for 5 minutes;

[0022] b3. Add additives: Add mildew inhibitor and mothproofing agent to the dispersant in batches, gradually increase the stirring speed of the disperser to 1000-1500 rpm for 15 minutes;

[0023] b4. Homogenization: The mixed material was subjected to ultrasonic treatment at a frequency of 20 kHz for 5 minutes;

[0024] b5. Degassing: Use vacuum degassing to eliminate bubbles introduced by stirring.

[0025] Furthermore, in step c, the step of preparing the foaming agent mixture comprises:

[0026] c1. Add foaming agent into a stainless steel container at an ambient temperature of 5-10°C;

[0027] c2. Add the amine catalyst first, then add the metal catalyst;

[0028] c3. Slowly add the surfactant dropwise while stirring;

[0029] c4. Stir for 10-15 minutes in a dark environment until the system becomes transparent and uniform;

[0030] c5. Vacuum degassing for 5 minutes at a pressure of -0.08 MPa.

[0031] Furthermore, in step d, the mixing pressure of the high-pressure foaming machine is 20 MPa, the speed of the dynamic mixing head is greater than 3000 rpm, and the curing hardness standard is: Shore C hardness ≥ 40, density 60-200 kg / m 3 .

[0032] Furthermore, in step e, the aging step includes:

[0033] e1. Cut off the flash of the solidified foam after foaming and place it on a microwave-safe tray;

[0034] e2. Microwave irradiation at a power of 300 W for 0-1 minute and at a power of 800 W for 1-5 minutes;

[0035] e3. After the microwave is finished, let it stand for 2 minutes and use the fan to help cool it down to below 40℃.

[0036] Furthermore, in step f, cutting is performed using a CNC foam cutting machine.

[0037] The beneficial effects of the present invention are as follows: the mildew-proof and moth-proof polyurethane foam manufacturing process improves the dispersibility and sustained-release effect by encapsulating the mildew inhibitor in silica nanocapsules, increases the pressure of the mixing head of the high-pressure foaming machine to 20 MPa, ensures the micron-level dispersion effect, adopts microwave radiation instead of the conventional curing method, improves the work efficiency, and enhances the scientific nature and practical value of the entire process. DETAILED DESCRIPTION

[0038] A process for producing mildew-proof and moth-proof polyurethane foam adhesive comprises the following steps:

[0039] a. Preparation of prepolymer: react polyether polyol and polyisocyanate at 80-85°C for 2-3 hours, controlling the isocyanate content to 15-30%, to obtain a prepolymer, wherein the mass ratio of polyether polyol to polyisocyanate is 1:1.2-1:1.5;

[0040] b. Preparation of prepolymer mixture: adding a mildew inhibitor, a mothproofing agent and a flame retardant to the prepolymer, and mixing them uniformly by high-speed stirring to obtain a prepolymer mixture;

[0041] c. Preparation of a foaming agent mixture: adding a catalyst and a surfactant to a foaming agent, stirring and mixing to obtain a foaming agent mixture;

[0042] d. Foaming molding: Add the prepolymer mixture and the foaming agent mixture in a ratio of 1:1.1-1:1.15 into a high-pressure foaming machine for mixing, and then inject into the mold for curing molding. The foaming temperature is 20-40°C, the humidity is 40-60%, and the curing time is 5-15 minutes.

[0043] e. Curing: Curing under 2.45 GHz microwave radiation for 5 minutes;

[0044] f. Trimming: Cut off excess foam.

[0045] Furthermore, in step b, the mass ratio of the mildewproofing agent, mothproofing agent and flame retardant added to the prepolymer is 5:3:10, and the mass ratio of the polyether polyol to the mildewproofing agent is 100:1; in step c, the mass ratio of the foaming agent, catalyst and surfactant is 50:1:10.

[0046] Furthermore, the foaming agent is HFC-245fa, the catalyst includes an amine catalyst and a metal catalyst, the surfactant is L-580, the mildew inhibitor is nanosilver, the mothproofing agent is borate, and the flame retardant is TCPP.

[0047] Furthermore, in step a, the reaction is terminated by titrating the NCO content, and the NCO content is titrated by the di-n-butylamine method, and the calculation formula is: Where N is the concentration of hydrochloric acid standard solution, m is the sample mass, V 空白 is the volume of hydrochloric acid standard solution consumed in the blank test, V 样品 The volume of hydrochloric acid standard solution consumed to titrate the sample.

[0048] Furthermore, the determination method comprises the following steps:

[0049] 1) Reagent Preparation: Dissolve 130 mL of di-n-butylamine in 1 L of anhydrous toluene to obtain a di-n-butylamine solution, prepare a 0.1 mol / L hydrochloric acid standard solution, and prepare a 0.1% ethanol solution as a bromocresol green indicator.

[0050] 2) Blank test: Take 10 ml of di-n-butylamine solution and 20 ml of anhydrous toluene, add 3 drops of indicator, and titrate with hydrochloric acid until a yellow spot appears. Record the volume V 空白 ;

[0051] 3) Sample determination: Accurately weigh the prepolymer sample, about 0.5-1 g, add 10 ml of di-n-butylamine solution, shake well and let it stand for 15 minutes. After the NCO is completely reacted, add 20 ml of anhydrous toluene and 3 drops of indicator, titrate with hydrochloric acid to a yellow focus, and record the volume V 样品 ;

[0052] 4) Calculation: Calculate the NCO content using the formula.

[0053] Furthermore, in step b, the step of preparing the prepolymer mixture includes:

[0054] b1. Material pretreatment: vacuum dehydrating the mildewcide, mothproofing agent, and flame retardant at 80°C for 2 hours. Grinding the mildewcide to a particle size of less than 50 μm, and encapsulating the mildewcide particles in silica nanocapsules.

[0055] The additive is pre-dried mainly to prevent the reaction of moisture with NCO.

[0056] The nanosilver particles are ground to a size below 50 μm mainly to prevent sedimentation.

[0057] b2. Material premixing: Heat the prepolymer to 50°C, then place it in the dispersant, add the flame retardant, and stir at a low speed of 300 rpm for 5 minutes;

[0058] b3. Add additives: Add mildew inhibitor and mothproofing agent to the dispersant in batches, gradually increase the stirring speed of the disperser to 1000-1500 rpm for 15 minutes;

[0059] b4. Homogenization: The mixed material was subjected to ultrasonic treatment at a frequency of 20 kHz for 5 minutes;

[0060] b5. Degassing: Use vacuum degassing to eliminate bubbles introduced by stirring.

[0061] Here, the temperature of the prepolymer is set to 50° C., mainly to reduce the viscosity of the prepolymer and prevent the NCO side reaction caused by excessively high temperature.

[0062] By encapsulating the mildew inhibitor in silica nanocapsules, the short-term, sudden release of the mildew inhibitor is transformed into a long-term, controlled release. At the same time, the problems of uneven dispersion, easy migration and short effectiveness are solved, the dispersibility and sustained release effect are improved, and the mildew inhibitor effect is thus ensured.

[0063] Through the above process, it is possible to ensure that the functional additives are evenly dispersed without affecting the reactivity of the prepolymer, thereby improving the mildew resistance and moth resistance.

[0064] Furthermore, in step c, the step of preparing the foaming agent mixture comprises:

[0065] c1. Add foaming agent into a stainless steel container at an ambient temperature of 5-10°C;

[0066] c2. Add the amine catalyst first, then add the metal catalyst;

[0067] c3. Slowly add the surfactant dropwise while stirring;

[0068] c4. Stir for 10-15 minutes in a dark environment until the system becomes transparent and uniform;

[0069] c5. Vacuum degassing for 5 minutes at a pressure of -0.08 MPa.

[0070] The foaming agent used in this process is a physical foaming agent, which can reduce volatility in a low temperature environment.

[0071] Here, the mixing uniformity can be tested by measuring the pH value, which is between 9-11.

[0072] Furthermore, in step d, the mixing pressure of the high-pressure foaming machine is 20 MPa, the speed of the dynamic mixing head is greater than 3000 rpm, and the curing hardness standard is: Shore C hardness ≥ 40, density 60-200 kg / m 3 .

[0073] Here, the mixing pressure of the high-pressure foaming machine is increased from the conventional 10-15MPa to 20MPa, mainly to ensure that the two components are mixed evenly and instantly.

[0074] Here, the mass ratio of the prepolymer mixture and the foaming agent mixture is 1:1.1-1:1.15, and the ratio is based on: 1. If the foaming agent is slightly excessive, between 1.1-1.15 times, the mixing loss can be appropriately compensated to ensure sufficient foaming; 2. If the foaming agent is insufficient, assuming the ratio is 1:1, it is easy to cause the foam density to be too high or the closed cell rate to decrease.

[0075] The foaming temperature is set at 20-40℃, and the foaming speed is proportional to the temperature. However, when the temperature is greater than 40℃, the gelation speed cannot keep up with the foaming speed, which may cause the foam cells to collapse.

[0076] The curing time here depends on the amount of catalyst used and the size of the mold. Small molds generally take 5-8 minutes to demould, while large products require 10-15 minutes to ensure sufficient curing.

[0077] Here the mold needs to be preheated so that the mold temperature is consistent with the foaming temperature to prevent the surface from forming too quickly.

[0078] Furthermore, in step e, the aging step includes:

[0079] e1. Cut off the flash of the solidified foam after foaming and place it on a microwave-safe tray;

[0080] e2. Microwave irradiation at a power of 300 W for 0-1 minute and at a power of 800 W for 1-5 minutes;

[0081] e3. After the microwave is finished, let it stand for 2 minutes and use the fan to help cool it down to below 40℃.

[0082] Furthermore, in step f, cutting is performed using a CNC foam cutting machine.

[0083] The reaction equipment for polyether polyol and polyisocyanate is a jacketed reactor.

[0084] The reaction temperature of polyether polyol and polyisocyanate is controlled at 80-85℃, mainly to ensure the reaction rate. The reaction rate increases by about 1 times when the temperature does not rise by 10℃. However, when the temperature exceeds 90℃, side reactions will occur, such as the formation of allophanate or MDI self-polymerization. Therefore, controlling the temperature at 80-85℃ can take into account both the reaction rate and the occurrence of side reactions.

[0085] The reaction time of polyether polyol and polyisocyanate is 2-3 hours. The specific time here depends on the ratio of raw materials. The higher the molar ratio of NCO to OH, the slower the reaction. If a small amount of catalyst is added, such as dibutyltin dilaurate, the reaction time can be shortened to 2 hours. The catalyst should not be too much, so it is more appropriate to set it within 2-3 hours. The NCO content is determined by titration here, and the reaction is terminated after reaching the target value. During the reaction, the stirring speed in the reactor is 200-500rpm.

[0086] The NCO content is titrated by di-n-butylamine method, and the calculation formula is: Where N is the concentration of hydrochloric acid standard solution, m is the sample mass, V 空白 is the volume of hydrochloric acid standard solution consumed in the blank test, V 样品 The volume of hydrochloric acid standard solution consumed to titrate the sample.

[0087] Here, the mass ratio of polyether polyol (hereinafter referred to as PRG) to polyisocyanate (hereinafter referred to as MDI) can actually be adjusted according to actual needs. The basis for the ratio adjustment is the isocyanate index. The calculation formula of the isocyanate index is: The theoretical MDI dosage is calculated from the hydroxyl value (OH value) of the polyether polyol and the NCO content of the polyisocyanate.

[0088] When the index is greater than 100, it indicates that NCO is excessive, the foam is harder and has better heat resistance, but the brittleness increases;

[0089] When the index is less than 100, it indicates that there is excess OH, the foam elasticity is high, but the mechanical strength is reduced.

[0090] In order to improve the anti-mildew and anti-termite effects, it is necessary to increase the amount of polyisocyanate to compensate for the consumed NCO.

[0091] Since MDI is toxic, you need to wear a gas mask, goggles and gloves when operating it to avoid inhaling toxic gases.

[0092] The storage temperature of the prepolymer should be below 25°C and kept sealed and away from light.

[0093] Example 1

[0094] Assuming that the hydroxyl value of the polyether polyol is 56 mg KOH / g, that is, the OH equivalent is about 1000, the NCO content of the polyisocyanate is 33.6%, the NCO equivalent is about 125, and the target isocyanate index is 1.1, that is, the NCO excess is 10%, then the theoretical MDI dosage is:

[0095] The actual amount of MDI used is: MDI 实际=8×1.1=8.8 parts, that is, PRG:MDI≈100:108.8.

[0096] In the determination of NCO content, samples need to be taken after the prepolymer is evenly mixed to avoid stratification affecting the results.

[0097] When titrating, add dropwise as the end point is approaching to prevent overdose.

[0098] The determination needs to be completed in a drying oven to ensure dry air and avoid high humidity causing NCO to react with water.

[0099] If the NCO% value is abnormally low, it is possible that the di-n-butylamine reaction is insufficient, and the standing time can be appropriately extended.

[0100] Example 2

[0101] NCO content determination: Assume V 样品 =18.5ml, V 空白 =25.0ml, N=0.1mol / L, m=0.8g, then

[0102] Example 3

[0103] Example process parameters:

[0104] Mixing ratio, prepolymer: foaming agent = 1:1.12;

[0105] Foaming temperature: 25℃;

[0106] Ambient humidity: 50% RH;

[0107] High pressure mixing pressure: 20MPa;

[0108] Curing time: 10min;

[0109] Foaming was performed according to the above process parameter data. Samples of the obtained foamed rubber were taken. The sample size was 50*50*5mm. The samples were tested. The test steps included:

[0110] 1. Selection of strains: Aspergillus niger, Penicillium, Trichoderma;

[0111] 2. Sample processing: Disinfect the surface of the foam gel sample with alcohol and place it in agar medium;

[0112] 3. Inoculation and cultivation: Spray the fungal spore suspension at a concentration of 1×10 6 spores / mL, cultured at 28°C and 85% humidity for 28 days;

[0113] 4. Result assessment: Level 1, 1.12% area is covered.

[0114] Example 4

[0115] Example process parameters:

[0116] Mixing ratio, prepolymer: foaming agent = 1:1.13;

[0117] Foaming temperature: 25℃;

[0118] Ambient humidity: 55% RH;

[0119] High pressure mixing pressure: 20MPa;

[0120] Curing time: 12min;

[0121] Foaming was performed according to the above process parameter data. Samples of the obtained foamed rubber were taken. The sample size was 20*20*12mm. The samples were tested. The test steps included:

[0122] 1. Insect species selection: black-skinned beetle, silverfish;

[0123] 2. Sample preparation: Place the foam sample and 50 insect eggs in a sealed container;

[0124] 3. Culture conditions: Observe for 60 days at a temperature of 25°C and a humidity of 70%, and record the larval survival rate and the sample infestation area;

[0125] 4. Test results: Larval mortality rate> 91.2%, and no visible holes on the sample surface.

[0126] Compared with the existing technology, this mildew-proof and moth-proof polyurethane foam manufacturing process improves the dispersibility and sustained-release effect by encapsulating the mildew inhibitor in silica nanocapsules, increases the pressure of the high-pressure foaming machine mixing head to 20MPa, ensures the micron-level dispersion effect, and uses microwave radiation instead of conventional aging methods to improve work efficiency and enhance the scientific and practical value of the entire process.

[0127] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A process for producing mildew-proof and moth-proof polyurethane foam, characterized in that: The following steps are involved: a. Preparation of prepolymer: react polyether polyol and polyisocyanate at 80-85°C for 2-3 hours, controlling the isocyanate content to 15-30%, to obtain a prepolymer, wherein the mass ratio of polyether polyol to polyisocyanate is 1:1.2-1:1.5; b. Preparation of prepolymer mixture: adding a mildew inhibitor, a mothproofing agent and a flame retardant to the prepolymer, and mixing them uniformly by high-speed stirring to obtain a prepolymer mixture; c. Preparation of a foaming agent mixture: adding a catalyst and a surfactant to a foaming agent, stirring and mixing to obtain a foaming agent mixture; d. Foaming molding: Add the prepolymer mixture and the foaming agent mixture in a ratio of 1:1.1-1:1.15 into a high-pressure foaming machine for mixing, and then inject into the mold for curing molding. The foaming temperature is 20-40°C, the humidity is 40-60%, and the curing time is 5-15 minutes. e. Curing: Curing under 2.45 GHz microwave radiation for 5 minutes; f. Trimming: Cut off excess foam.

2. The process for producing the mildew-proof and moth-proof polyurethane foam according to claim 1, wherein: In step b, the mass ratio of the mildew preventer, mothproofing agent and flame retardant added to the prepolymer is 5:3:10, and the mass ratio of the polyether polyol to the mildew preventer is 100:1; in step c, the mass ratio of the foaming agent, catalyst and surfactant is 50:1:

10.

3. The process for producing the mildew-proof and moth-proof polyurethane foam according to claim 1, wherein: The foaming agent is HFC-245fa, the catalyst includes an amine catalyst and a metal catalyst, the surfactant is L-580, the mildew preventive is nano silver, the mothproofing agent is borate, and the flame retardant is TCPP.

4. The process for producing the mildew-proof and moth-proof polyurethane foam according to claim 1, wherein: In step a, the reaction is terminated by titrating the NCO content, and the NCO content is titrated by the di-n-butylamine method, and the calculation formula is: Where N is the concentration of hydrochloric acid standard solution, m is the sample mass, V 空白 is the volume of hydrochloric acid standard solution consumed in the blank test, V 样品 The volume of hydrochloric acid standard solution consumed to titrate the sample.

5. The process for producing the mildew-proof and moth-proof polyurethane foam according to claim 4, characterized in that: The determination method includes the following steps: 1) Reagent Preparation: Dissolve 130 mL of di-n-butylamine in 1 L of anhydrous toluene to obtain a di-n-butylamine solution, prepare a 0.1 mol / L hydrochloric acid standard solution, and prepare a 0.1% ethanol solution as a bromocresol green indicator. 2) Blank test: Take 10 ml of di-n-butylamine solution and 20 ml of anhydrous toluene, add 3 drops of indicator, and titrate with hydrochloric acid until a yellow spot appears. Record the volume V 空白 ; 3) Sample determination: Accurately weigh the prepolymer sample, about 0.5-1 g, add 10 ml of di-n-butylamine solution, shake well and let it stand for 15 minutes. After the NCO is completely reacted, add 20 ml of anhydrous toluene and 3 drops of indicator, titrate with hydrochloric acid to a yellow focus, and record the volume V 样品 ; 4) Calculation: Calculate the NCO content using the formula.

6. The process for producing the mildew-proof and moth-proof polyurethane foam according to claim 1, wherein: In step b, the steps of preparing the prepolymer mixture include: b1. Material pretreatment: vacuum dehydrating the mildewcide, mothproofing agent, and flame retardant at 80°C for 2 hours. Grinding the mildewcide to a particle size of less than 50 μm, and encapsulating the mildewcide particles in silica nanocapsules. b2. Material premixing: Heat the prepolymer to 50°C, then place it in the dispersant, add the flame retardant, and stir at a low speed of 300 rpm for 5 minutes; b3. Add additives: Add mildew inhibitor and mothproofing agent to the dispersant in batches, gradually increase the stirring speed of the disperser to 1000-1500 rpm for 15 minutes; b4. Homogenization: The mixed material was subjected to ultrasonic treatment at a frequency of 20 kHz for 5 minutes; b5. Degassing: Use vacuum degassing to eliminate bubbles introduced by stirring.

7. The process for producing the mildew-proof and moth-proof polyurethane foam according to claim 1, wherein: In step c, the steps of preparing the foaming agent mixture include: c1. Add foaming agent into a stainless steel container at an ambient temperature of 5-10°C; c2. Add the amine catalyst first, then add the metal catalyst; c3. Slowly add the surfactant dropwise while stirring; c4. Stir for 10-15 minutes in a dark environment until the system becomes transparent and uniform; c5. Vacuum degassing for 5 minutes at a pressure of -0.08 MPa.

8. The process for producing the mildew-proof and moth-proof polyurethane foam according to claim 1, wherein: In step d, the mixing pressure of the high-pressure foaming machine is 20 MPa, the dynamic mixing head speed is greater than 3000 rpm, and the curing hardness standard is: Shore C hardness ≥ 40, density 60-200 kg / m 3 .

9. The process for producing mildew-proof and moth-proof polyurethane foam according to claim 1, wherein: In step e, the aging step includes: e1. Cut off the flash of the solidified foam after foaming and place it on a microwave-safe tray; e2. Microwave irradiation at a power of 300 W for 0-1 minute and at a power of 800 W for 1-5 minutes; e3. After the microwave is finished, let it stand for 2 minutes and use the fan to help cool it down to below 40℃.

10. The process for producing mildew-proof and moth-proof polyurethane foam according to claim 1, characterized in that: In step f, cutting is performed using a CNC foam cutting machine.

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