Bacteriostatic environment-friendly two-component polyurethane emulsion

Abstract

The invention relates to the technical field of polyurethane adhesives, and discloses a bacteriostatic environment-friendly two-component polyurethane emulsion, which is prepared from the following raw materials in parts by weight: 50 to 200 parts of component A; 2-10 parts of a component B; the component A is a modified L-lysine organic silicon polyurethane emulsion; the component B is a mixture of polyester polyol and small molecular alcohol; the bacteriostatic environment-friendly two-component polyurethane emulsion disclosed by the invention is directly used as an adhesive, is mild in reaction, and has no color difference, color change or glue penetration after being glued.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane adhesives, and in particular to an antibacterial and environmentally friendly two-component polyurethane emulsion. Background Art

[0002] Compared with traditional polyurethane products, waterborne polyurethane greatly reduces the use of organic solvents and reduces the harm of these substances to the human body. As a hot water-based product, it has excellent chemical corrosion resistance and good processing performance, and can be widely used in textiles, clothing, construction, home decoration, automobiles and other fields. However, it is often interfered by bacteria and other microorganisms during actual use. Microbial infections such as bacteria and fungi cause serious harm to various fields and threaten human health. This also limits the further promotion of waterborne polyurethane materials. Therefore, in order to improve the application value of waterborne polyurethane and expand its scope of application, it is necessary to develop waterborne polyurethane materials with antibacterial properties, so as to prepare antibacterial products with excellent performance.

[0003] Polycarbonate polyol (PCDL) can be used to produce polyurethane, acrylic resin, polyester and other products. As one of the newest polyol materials, PCDL has shown strong advantages. Compared with traditional polyurethane materials, the new generation of polycarbonate polyurethane synthesized with PCDL has outstanding performance advantages: excellent hydrolysis resistance, heat resistance, oxidation resistance, wear resistance, as well as excellent mechanical properties and microbial degradation, and can be widely used in various fields such as textiles and medical treatment.

[0004] Waterborne polyurethane is often interfered by bacteria and other microorganisms during actual use, which limits the further promotion of waterborne polyurethane materials. In the existing waterborne polyurethane system, the antibacterial effect is achieved by adding bactericides. The current CMIT / MIT is a broad-spectrum bactericide developed by SKCN Chemicals based on isothiazolinone technology, but the antiseptic ability of MIT / CMIT bactericide is strong, and excessive content will cause irreversible harm to the human body and the environment. In recent years, various companies including China have strictly investigated products containing CMIT / MIT ingredients and strictly restricted the CMIT / MIT content in their imported raw materials or products. By grafting L-lysine on the chain segments of polyurethane, the structure of polyurethane itself is improved, thereby changing the performance of polyurethane and achieving the purpose of sterilization.

[0005] Secondly, although traditional water-based polyurethane emulsions have excellent processability, their water whitening resistance and heat resistance are still important factors that limit their application expansion. The introduction of polycarbonate polyols introduces repeated carbonate groups into the main chain of the molecule, which greatly improves the hydrolysis resistance of water-based polyurethane. At the same time, the presence of carbonate groups also makes it easier for the groups to adhere to the surface of the substrate without changing the structure of the molecule, which improves the high temperature resistance of the adhesive, thereby improving its bonding strength, and there is no color difference before gluing. Therefore, it is of great significance to develop an antibacterial and environmentally friendly polyurethane adhesive. Summary of the invention

[0006] The purpose of the present invention is to provide an antibacterial and environmentally friendly two-component polyurethane emulsion.

[0007] Terminology Note:

[0008] An antibacterial and environmentally friendly two-component polyurethane emulsion comprises the following raw materials in parts by weight:

[0009] Component A: 50-200 parts;

[0010] Component B 2 to 10 parts;

[0011] The component A is a modified L-lysine silicone polyurethane emulsion;

[0012] The B component is a mixture of polyester polyol and small molecule alcohol.

[0013] As a preferred technical solution, the mass ratio of component A to component B is 100:2-10.

[0014] A method for preparing an antibacterial and environmentally friendly two-component polyurethane emulsion comprises the following steps:

[0015] 1) Preparation of component A: 2500-3000 parts by weight of polycarbonate polyol are added to a reaction kettle, heated to 120-140°C under the protection of nitrogen, and vacuum-dehydrated for 0.5-1.5h; cooled to 50-60°C, 40-80 parts by weight of No. 1 small molecule alcohol, 0.01-0.1 parts by weight of No. 1 catalyst, 80-120 parts by weight of No. 1 solvent, and 600-1000 parts by weight of L-lysine diisocyanate are added to the reaction kettle, and the temperature is raised ..., and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 140-140°C, and the temperature is raised to 140-140°C, and the temperature is raised to The mixture was heated to 60°C, reacted for 5 hours, and sampled for NCO testing. After the mixture was qualified, the mixture was cooled to 50°C, 40 to 80 parts by weight of a chain extender and 5 to 15 parts by weight of a hydrophilic chain extender were added, and the reaction was continued for 2 hours. The reaction end point was tested by sampling. After the mixture was cooled, 20 to 80 parts by weight of a salt-forming agent were added. Under high-speed dispersion, 1600 to 2000 parts by weight of water, 20 to 60 parts by weight of a light stabilizer, and 5 to 8 parts by weight of a capping agent were added to obtain a modified L-lysine silicone polyurethane emulsion, namely component A.

[0016] 2) Preparation of component B: 20-60 parts by weight of polyester polyol and 3-8 parts by weight of No. 1 small molecule alcohol are added to an emulsifying kettle, mixed evenly, and vacuumed to remove moisture. When the temperature of the emulsifying kettle reaches 130° C., the timing starts, and the vacuuming time is 1 hour;

[0017] In the reactor polymerization process, 30 to 70 parts by weight of MDI-50 and 3 to 6 parts by weight of solvent are added to the reactor, 0.01 to 0.03 parts by weight of catalyst No. 1 is added thereto, and the mixture is preheated to 60° C. by steam, and the components in the emulsification kettle are dripped into the reactor by adjusting the valve opening, and the dripping speed is controlled, and the dripping time is 6 hours; after the dripping is completed, the temperature of the reactor is maintained at 70 to 85° C. for 2 to 5 hours, and the NCO content of the prepolymer is sampled and tested, and the temperature is lowered after the prepolymer is qualified, and when the temperature of the reactor drops to 40 to 45° C., the material is discharged to obtain component B;

[0018] 3) When in use, component A and component B are used together to obtain an antibacterial and environmentally friendly two-component polyurethane emulsion; the mass ratio of component A to component B is 100:2-10.

[0019] As a preferred technical solution, 2700 parts by weight of polycarbonate polyol in step 1) are added to a reactor; 60 parts by weight of No. 1 small molecule alcohol, 0.05 parts by weight of No. 1 catalyst, 100 parts by weight of No. 1 solvent, 800 parts by weight of L-lysine diisocyanate are added; 60 parts by weight of chain extender and 10 parts by weight of hydrophilic chain extender are added; 50 parts by weight of salt-forming agent are added; 1800 parts by weight of water, 40 parts by weight of light stabilizer and 6 parts by weight of end-capping agent are added in a high-speed dispersion state to obtain a modified L-lysine silicone polyurethane emulsion.

[0020] As a preferred technical solution, in the step 2), 40 parts by weight of polyester polyol and 5 parts by weight of No. 1 small molecule alcohol are added to the emulsification kettle; in the polymerization process of the reactor: 50 parts by weight of MDI-50 and 5 parts by weight of solvent are added to the reactor, and 0.02 parts by weight of No. 1 catalyst is added.

[0021] As a preferred technical solution, the small molecule alcohol is 1.4-butanediol; and the No. 1 catalyst is an organic bismuth catalyst.

[0022] As a preferred technical solution, the solvent No. 1 in 1) is acetone, the chain extender is TMP, the hydrophilic chain extender is DMPA, the salt-forming agent is triethylamine, the light stabilizer is Tinuvin 292, and the end-capping agent is ethylenediamine.

[0023] As a preferred technical solution, the preparation method of the polyester polyol in step 2) is:

[0024] Add 2500-3000 parts by weight of No. 2 low molecular alcohol into the reaction kettle by vacuum method, then add 180-220 parts by weight of TMP, 2800-3200 parts by weight of adipic acid, and 0.1-0.3 parts by weight of antioxidant;

[0025] The reactor was heated to 250°C and kept warm for 5 hours. After the insulation was completed, 0.01 parts by weight of catalyst No. 2 was added and kept warm for another 5 hours. After the insulation was completed, vacuum was evacuated. After 10 hours of vacuumization, the acid value and hydroxyl value were measured. If qualified, cooling water was passed to cool down to 100°C, and the material was discharged to obtain polyester polyol.

[0026] As a preferred technical solution, in the preparation method of the polyester polyol in step 2), 2700 parts by weight of No. 2 low-molecular alcohol is added to the reaction kettle in a vacuum manner, and then 200 parts by weight of TMP, 3000 parts by weight of adipic acid, and 0.2 parts by weight of an antioxidant are added;

[0027] The reactor was heated to 250°C and kept warm for 5 hours. After the insulation was completed, 0.01 parts by weight of catalyst No. 2 was added and kept warm for another 5 hours. After the insulation was completed, vacuum was evacuated. After 10 hours of vacuumization, the acid value and hydroxyl value were measured. If qualified, cooling water was passed to cool down to 100°C, and the material was discharged to obtain polyester polyol.

[0028] As a preferred technical solution, the No. 2 small molecule alcohol is methyl propylene glycol, and the No. 2 catalyst is tetraisobutyl titanate.

[0029] As a preferred technical solution, after the dropwise addition in step 2) is completed, the temperature of the reactor is maintained at 80°C for 2 to 5 hours, and the NCO content of the prepolymer is tested by sampling. If it is qualified, the temperature is lowered, and when the temperature of the reactor drops to 42°C, the material is discharged.

[0030] The invention adopts an antibacterial and environmentally friendly two-component polyurethane emulsion, which includes the following raw materials by weight: 50 to 200 parts of component A and 2 to 10 parts of component B; the component A is a modified L-lysine silicone polyurethane emulsion; and the component B is a mixture of polyester polyol and small molecule alcohol.

[0031] Advantages of the present invention:

[0032] The antibacterial and environmentally friendly two-component polyurethane emulsion of the present invention is directly used as an adhesive, has a mild reaction, and has no color difference, discoloration or glue penetration after gluing;

[0033] It solves the problem of easy bacterial growth in current water-based polyurethane emulsion products, can effectively reduce bacterial growth, and effectively extend the shelf life of products. In addition, the raw material synthesis does not contain bactericides such as MIT / CMIT, the raw materials are safe, and convenient for practitioners to use.

[0034] By introducing polycarbonate polyols, the hydrolysis resistance of the adhesive is effectively improved, the weather resistance is good, and the water whitening resistance is effectively improved.

[0035] It is suitable for bonding nylon hook and loop fasteners. For nylon materials, at a speed of 250mm / min, its tensile strength can reach over 8kN / m, and its tensile force can reach over 140N. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments.

[0037] Embodiment 1:

[0038] 1) Preparation of component A: 2500 parts by weight of polycarbonate polyol are added to a reactor, heated to 120°C under the protection of nitrogen, and vacuumed for dehydration for 0.5h; cooled to 50°C, 40 parts by weight of No. 1 small molecule alcohol, 0.01 parts by weight of No. 1 catalyst, 80 parts by weight of No. 1 solvent, and 600 parts by weight of L-lysine diisocyanate are added, the reactor is heated to 60°C, reacted for 5h, and NCO is tested by sampling. After passing the test, the temperature is lowered to 50°C, 40 parts by weight of chain extender and 5 parts by weight of hydrophilic chain extender are added, and the reaction is continued for 2h, and the reaction end point is tested by sampling. After cooling, 20 parts by weight of salt-forming agent are added, and 1600 parts by weight of water, 20 parts by weight of light stabilizer, and 5 parts by weight of end-capping agent are added in a high-speed dispersion state to obtain a modified L-lysine silicone polyurethane emulsion, i.e. component A;

[0039] 2) Preparation of component B: 20 ​​parts by weight of polyester polyol and 3 parts by weight of No. 1 small molecule alcohol were added to an emulsifying kettle, mixed evenly, and vacuumed to remove moisture. When the temperature of the emulsifying kettle reached 130° C., the timing was started, and the vacuuming time was 1 hour;

[0040] In the reactor polymerization process, 30 parts by weight of MDI-50 and 3 parts by weight of solvent are added to the reactor, 0.01 parts by weight of catalyst No. 1 is added thereto, and the mixture is preheated to 60° C. by steam, and the components in the emulsification kettle are dripped into the reactor by adjusting the valve opening, and the dripping speed is controlled, and the dripping time is 6 hours; after the dripping is completed, the temperature of the reactor is maintained at 70° C. for 2 hours, and the NCO content of the prepolymer is sampled and tested, and the temperature is lowered after it is qualified, and when the temperature of the reactor drops to 40° C., the material is discharged to obtain component B;

[0041] 3) When in use, component A and component B are used together to obtain an antibacterial and environmentally friendly two-component polyurethane emulsion; the mass ratio of component A to component B is 100:2.

[0042] The small molecule alcohol is 1.4-butanediol; and the No. 1 catalyst is an organic bismuth catalyst.

[0043] In the above 1), the solvent No. 1 is acetone, the chain extender is TMP, the hydrophilic chain extender is DMPA, the salt-forming agent is triethylamine, the light stabilizer is Tinuvin 292, and the end-capping agent is ethylenediamine.

[0044] The preparation method of the polyester polyol in the step 2) is:

[0045] 2500 parts by weight of No. 2 low molecular alcohol were added to the reactor in a vacuum manner, followed by 180 parts by weight of TMP, 2800 parts by weight of adipic acid, and 0.1 parts by weight of an antioxidant;

[0046] The reactor was heated to 250°C and kept warm for 5 hours. After the insulation was completed, 0.01 parts by weight of catalyst No. 2 was added and kept warm for another 5 hours. After the insulation was completed, vacuum was evacuated. After 10 hours of vacuumization, the acid value and hydroxyl value were measured. If qualified, cooling water was passed to cool down to 100°C, and the material was discharged to obtain polyester polyol.

[0047] The No. 2 small molecule alcohol is methyl propylene glycol, and the No. 2 catalyst is tetraisobutyl titanate.

[0048] Embodiment 2:

[0049] 1) Preparation of component A: 3000 parts by weight of polycarbonate polyol are added to a reactor, heated to 140° C. under the protection of nitrogen, and vacuumed for dehydration for 1.5 hours; cooled to 60° C., 80 parts by weight of No. 1 small molecule alcohol, 0.1 parts by weight of No. 1 catalyst, 120 parts by weight of No. 1 solvent, and 1000 parts by weight of L-lysine diisocyanate are added. The reactor is heated to 60° C. and reacted for 5 hours. Samples are taken to test NCO. After passing the test, the temperature is lowered to 50° C., 80 parts by weight of chain extender and 15 parts by weight of hydrophilic chain extender are added, and the reaction is continued for 2 hours. Samples are taken to test the reaction end point. After cooling, 80 parts by weight of salt-forming agent are added, and 2000 parts by weight of water, 60 parts by weight of light stabilizer, and 8 parts by weight of end-capping agent are added in a high-speed dispersion state to obtain a modified L-lysine silicone polyurethane emulsion, i.e., component A;

[0050] 2) Preparation of component B: 60 parts by weight of polyester polyol and 8 parts by weight of No. 1 small molecule alcohol were added to an emulsifying kettle, mixed evenly, and vacuumed to remove moisture. When the temperature of the emulsifying kettle reached 130° C., the timing was started, and the vacuuming time was 1 hour;

[0051] In the reactor polymerization process, 70 parts by weight of MDI-50 and 6 parts by weight of solvent are added to the reactor, 0.03 parts by weight of catalyst No. 1 is added thereto, and the mixture is preheated to 60° C. by steam, and the components in the emulsification kettle are dripped into the reactor by adjusting the valve opening, and the dripping speed is controlled, and the dripping time is 6 hours; after the dripping is completed, the temperature of the reactor is maintained at 85° C. for 5 hours, and the NCO content of the prepolymer is sampled and tested, and the temperature is lowered after the prepolymer is qualified, and when the temperature of the reactor drops to 45° C., the material is discharged to obtain component B;

[0052] 3) When in use, component A and component B are used together to obtain an antibacterial and environmentally friendly two-component polyurethane emulsion; the mass ratio of component A to component B is 100:10.

[0053] The small molecule alcohol is 1.4-butanediol; and the No. 1 catalyst is an organic bismuth catalyst.

[0054] In the above 1), the solvent No. 1 is acetone, the chain extender is TMP, the hydrophilic chain extender is DMPA, the salt-forming agent is triethylamine, the light stabilizer is Tinuvin 292, and the end-capping agent is ethylenediamine.

[0055] The preparation method of the polyester polyol in the step 2) is:

[0056] 3000 parts by weight of No. 2 low molecular alcohol were added to the reactor by vacuum, followed by 220 parts by weight of TMP, 3200 parts by weight of adipic acid, and 0.3 parts by weight of an antioxidant;

[0057] The reactor was heated to 250°C and kept warm for 5 hours. After the insulation was completed, 0.01 parts by weight of catalyst No. 2 was added and kept warm for another 5 hours. After the insulation was completed, vacuum was evacuated. After 10 hours of vacuumization, the acid value and hydroxyl value were measured. If qualified, cooling water was passed to cool down to 100°C, and the material was discharged to obtain polyester polyol.

[0058] The No. 2 small molecule alcohol is methyl propylene glycol, and the No. 2 catalyst is tetraisobutyl titanate.

[0059] Embodiment 3:

[0060] 1) Preparation of component A: 2700 parts by weight of polycarbonate polyol are added to a reactor, heated to 130° C. under the protection of nitrogen, and vacuumed for dehydration for 1 hour; cooled to 55° C., 60 parts by weight of No. 1 small molecule alcohol, 0.05 parts by weight of No. 1 catalyst, 100 parts by weight of No. 1 solvent, and 800 parts by weight of L-lysine diisocyanate are added, the reactor is heated to 60° C., reacted for 5 hours, and NCO is sampled and tested. After passing the test, the temperature is lowered to 50° C., 60 parts by weight of chain extender and 10 parts by weight of hydrophilic chain extender are added, and the reaction is continued for 2 hours. The reaction end point is sampled and tested. After cooling, 50 parts by weight of salt-forming agent are added, and 1800 parts by weight of water, 2400 parts by weight of light stabilizer, and 6 parts by weight of end-capping agent are added in a high-speed dispersion state to obtain a modified L-lysine silicone polyurethane emulsion, namely component A;

[0061] 2) Preparation of component B: 40 parts by weight of polyester polyol and 6 parts by weight of No. 1 small molecule alcohol were added to an emulsifying kettle, mixed evenly, and vacuumed to remove moisture. The timing was started when the temperature of the emulsifying kettle reached 130° C. The vacuuming time was 1 hour;

[0062] In the reactor polymerization process, 50 parts by weight of MDI-50 and 5 parts by weight of solvent are added to the reactor, 0.02 parts by weight of catalyst No. 1 is added thereto, and the mixture is preheated to 60° C. by steam, and the components in the emulsification kettle are dripped into the reactor by adjusting the valve opening, and the dripping speed is controlled, and the dripping time is 6 hours; after the dripping is completed, the temperature of the reactor is maintained at 80° C. for 3.5 hours, and the NCO content of the prepolymer is sampled and tested, and the temperature is lowered after the prepolymer is qualified, and when the temperature of the reactor drops to 42° C., the material is discharged to obtain component B;

[0063] 3) When in use, component A and component B are used together to obtain an antibacterial and environmentally friendly two-component polyurethane emulsion; the mass ratio of component A to component B is 100:2-10.

[0064] The small molecule alcohol is 1.4-butanediol; and the No. 1 catalyst is an organic bismuth catalyst.

[0065] In the above 1), the solvent No. 1 is acetone, the chain extender is TMP, the hydrophilic chain extender is DMPA, the salt-forming agent is triethylamine, the light stabilizer is Tinuvin 292, and the end-capping agent is ethylenediamine.

[0066] The preparation method of the polyester polyol in the step 2) is:

[0067] 2700 parts by weight of No. 2 low molecular alcohol were added to the reactor in a vacuum manner, followed by 200 parts by weight of TMP, 3000 parts by weight of adipic acid, and 0.2 parts by weight of an antioxidant;

[0068] The reactor was heated to 250°C and kept warm for 5 hours. After the insulation was completed, 0.01 parts by weight of catalyst No. 2 was added and kept warm for another 5 hours. After the insulation was completed, vacuum was evacuated. After 10 hours of vacuumization, the acid value and hydroxyl value were measured. If qualified, cooling water was passed to cool down to 100°C, and the material was discharged to obtain polyester polyol.

[0069] The No. 2 small molecule alcohol is methyl propylene glycol, and the No. 2 catalyst is tetraisobutyl titanate.

[0070] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An antibacterial and environmentally friendly two-component polyurethane emulsion, characterized in that: It includes the following raw materials in parts by weight: Component A: 50-200 parts; Component B 2 to 10 parts; The component A is a modified L-lysine silicone polyurethane emulsion; The B component is a mixture of polyester polyol and small molecule alcohol.

2. The antibacterial and environmentally friendly two-component polyurethane emulsion according to claim 1, characterized in that: The mass ratio of the component A to the component B is 100:2-10.

3. A method for preparing the antibacterial and environmentally friendly two-component polyurethane emulsion according to any one of claims 1 or 2, characterized in that: The following steps are involved: 1) Preparation of component A: 2500-3000 parts by weight of polycarbonate polyol are added to a reaction kettle, heated to 120-140°C under the protection of nitrogen, and vacuum-dehydrated for 0.5-1.5h; cooled to 50-60°C, 40-80 parts by weight of No. 1 small molecule alcohol, 0.01-0.1 parts by weight of No. 1 catalyst, 80-120 parts by weight of No. 1 solvent, and 600-1000 parts by weight of L-lysine diisocyanate are added to the reaction kettle, and the temperature is raised ..., and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 120-140°C, and the temperature is raised to 140-140°C, and the temperature is raised to 140-140°C, and the temperature is raised to The mixture was heated to 60°C, reacted for 5 hours, and sampled for NCO testing. After the mixture was qualified, the mixture was cooled to 50°C, 40 to 80 parts by weight of a chain extender and 5 to 15 parts by weight of a hydrophilic chain extender were added, and the reaction was continued for 2 hours. The reaction end point was tested by sampling. After the mixture was cooled, 20 to 80 parts by weight of a salt-forming agent were added. Under high-speed dispersion, 1600 to 2000 parts by weight of water, 20 to 60 parts by weight of a light stabilizer, and 5 to 8 parts by weight of a capping agent were added to obtain a modified L-lysine silicone polyurethane emulsion, namely component A. 2) Preparation of component B: 20-60 parts by weight of polyester polyol and 3-8 parts by weight of No. 1 small molecule alcohol are added to an emulsifying kettle, mixed evenly, and vacuumed to remove moisture. When the temperature of the emulsifying kettle reaches 130° C., the timing starts, and the vacuuming time is 1 hour; In the reactor polymerization process, 30 to 70 parts by weight of MDI-50 and 3 to 6 parts by weight of solvent are added to the reactor, 0.01 to 0.03 parts by weight of catalyst No. 1 is added thereto, and the mixture is preheated to 60° C. by steam, and the components in the emulsification kettle are dripped into the reactor by adjusting the valve opening, and the dripping speed is controlled, and the dripping time is 6 hours; after the dripping is completed, the temperature of the reactor is maintained at 70 to 85° C. for 2 to 5 hours, and the NCO content of the prepolymer is sampled and tested, and the temperature is lowered after the prepolymer is qualified, and the reaction kettle is discharged when the temperature drops to 40 to 45° C. to obtain component B; 3) When in use, component A and component B are used together to obtain an antibacterial and environmentally friendly two-component polyurethane emulsion; the mass ratio of component A to component B is 100:2-10.

4. A method for preparing an antibacterial and environmentally friendly two-component polyurethane emulsion according to claim 3, characterized in that: The small molecule alcohol is 1.4-butanediol; and the No. 1 catalyst is an organic bismuth catalyst.

5. A method for preparing an antibacterial and environmentally friendly two-component polyurethane emulsion according to claim 3, characterized in that: In the above 1), the solvent No. 1 is acetone, the chain extender is TMP, the hydrophilic chain extender is DMPA, the salt-forming agent is triethylamine, the light stabilizer is Tinuvin 292, and the end-capping agent is ethylenediamine.

6. A method for preparing an antibacterial and environmentally friendly two-component polyurethane emulsion according to claim 3, characterized in that: The preparation method of the polyester polyol in the step 2) is: Add 2500-3000 parts by weight of No. 2 low molecular alcohol into the reaction kettle by vacuum method, then add 180-220 parts by weight of TMP, 2800-3200 parts by weight of adipic acid, and 0.1-0.3 parts by weight of antioxidant; The reactor temperature was raised to 250°C and kept at this temperature for 5 hours; After the insulation is completed, 0.01 parts by weight of catalyst No. 2 is added and the insulation is continued for another 5 hours. After the insulation is completed, vacuum is evacuated. After 10 hours of vacuum evacuation, the acid value and hydroxyl value are measured. If qualified, cooling water is passed to cool down to 100°C, and the material is discharged to obtain polyester polyol.

7. A method for preparing an antibacterial and environmentally friendly two-component polyurethane emulsion according to claim 6, characterized in that: The No. 2 small molecule alcohol is methyl propylene glycol, and the No. 2 catalyst is tetraisobutyl titanate.

8. A method for preparing an antibacterial and environmentally friendly two-component polyurethane emulsion according to claim 3, characterized in that: After the dropwise addition in step 2) is completed, the temperature of the reactor is maintained at 80° C. for 2 to 5 hours, and the NCO content of the prepolymer is tested by sampling. If the prepolymer is qualified, the temperature is lowered, and the material is discharged when the temperature of the reactor drops to 42° C.