CN111253549A - Phosphorus-containing palm oil-based pure water polyurethane nano-emulsion and preparation method thereof - Google Patents
Phosphorus-containing palm oil-based pure water polyurethane nano-emulsion and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a phosphorus-containing palm oil-based pure water polyurethane nano emulsion and a preparation method thereof. The preparation method disclosed by the invention is simple in experimental steps, short in reaction time and high in production efficiency, relieves the dependence degree of the waterborne polyurethane on petroleum resources, and reduces the production cost; the obtained phosphorus-containing palm oil-based waterborne polyurethane nano emulsion is light in color, is uniform compared with an unmodified waterborne polyurethane emulsion system, has good stability, and improves the flame retardance, the modulus and the strength after film forming.
Description
Technical Field
The invention relates to a phosphorus-containing palm oil-based pure water polyurethane nano emulsion and a preparation method thereof, belongs to the field of high polymer materials, and particularly relates to a preparation method of the phosphorus-containing palm oil-based pure water polyurethane nano emulsion.
Background
The Waterborne Polyurethane (WPU) takes water as a solvent, not only inherits the advantages of strong adhesive force, high hardness, wear resistance and the like of solvent type polyurethane, but also has the advantages of low VOC (volatile organic compounds) and no HAPs (hazardous air polutants) of waterborne coatings, and is widely applied. The WPU has the product forms of foam plastics, elastomers, thermoplastic plastics, adhesives, coatings, fibers and the like, and is used in the fields of heat insulation materials, furniture, clothes, shoe materials, waterproof coatings, mechanical parts, automobiles, high-speed rails, biomedicine and the like. At present, 75 percent of polyols for preparing waterborne polyurethane are petroleum-based polyether polyols, the cost is greatly influenced by the price of crude oil, and the polyols are difficult to degrade and influence the ecological environment. With the increasing shortage of petroleum resources and the increasing importance of people on sustainable development and environmental protection, bio-based WPUs using renewable resources as raw materials are receiving more and more attention. The bio-based polyol can replace part (20-30%) of petroleum-based polyether polyol to prepare the waterborne polyurethane. The use of the vegetable oil-based polyol can reduce the dependence on petroleum resources, and meanwhile, the product is degradable and has little influence on the ecological environment. As a renewable resource, the vegetable oil has the advantages of rich resources, low cost and the like. The vegetable oil contains functional groups such as carbon-carbon double bonds, ester bonds and the like, is favorable for modification reactions such as epoxidation, hydrogenation, oxidation, ester exchange, aminolysis and the like, and the prepared modified vegetable oil is widely used in the fields of bio-based chemicals and synthetic materials.
Oil palm is the most productive oil-producing plant in the world, has the reputation of "world oil king" and is mainly distributed in malaysia and indonesia in asia, west and middle parts of africa, north and middle parts of south america. Palm oil refers to a triglyceride-rich oil extracted from palm pulp from the oil palm tree. The palm oil contains 50% of saturated fatty acid and 50% of unsaturated fatty acid, has good oxidation stability, and is an excellent industrial oil. Palm oil is the most expensive edible vegetable oil in the world, is lower in price than other oil materials such as soybean oil, rapeseed oil and the like, and has strong competitiveness in the industrial processing market of the world. Because of its low price and good processability and modification potential, palm oil and its related products have important applications in the fields of food, washing products, cosmetics, grease chemical industry and the like. China is relatively lagged behind in the research aspect of vegetable oil-based polyols, but China is a world with large petroleum consumption and a world with large vegetable oil production, so that the research of vegetable oil-based polyols to partially replace petroleum-based polyols has important significance. The external high-pressure homogenizer utilizes the mechanical force action and corresponding thermal effect of the external high-pressure homogenizer, such as high-speed shearing, high-frequency oscillation, cavitation, convection impact and the like, so that the crude emulsion can be prepared into the nano emulsion by the mechanical force and the chemical effect caused by the mechanical force and the chemical effect, the nano emulsion has good dispersion stability, is not easy to polymerize or separate, and has the advantages of uniform product, strong stability, high preparation efficiency, low dependence demand of a catalyst and an additive and the like.
Disclosure of Invention
One purpose of the invention is to select palm oil-based polyol to partially replace petroleum-based polyol to prepare waterborne polyurethane, wherein each molecule of palm oil only contains 1.6-1.8 double bonds on average, the number of the double bonds of the palm oil is less, the hydroxyl number of the prepared palm oil polyol is easy to control, the viscosity is moderate, the technological route and the raw material use are different from other researches, the operation is simple, and the production efficiency is high; the phosphorus-containing palm oil-based polyol is prepared by introducing phosphorus elements, the prepared waterborne polyurethane is lighter in color than other vegetable oil polyols, has good stability compared with unmodified waterborne polyurethane emulsion, and improves modulus, strength, flame retardance and the like after film forming.
The second purpose of the invention is that the traditional oil-based polyurethane has serious environmental pollution, high toxicity and high cost, and most of the used polyols are derived from petroleum and cannot be regenerated. The palm oil-based polyol is selected to partially replace petroleum-based polyether polyol to prepare the pure water polyurethane nano emulsion, so that the pollution is reduced, the dependence on petroleum is relieved, the raw material source is wide, and the use cost is low. The nano emulsion is prepared by a high-pressure homogeneous preparation method, the process is simple, a surfactant is not needed, the production cost is low, the pollution is small, the particle size of the prepared emulsion is small, the distribution is narrow, and the emulsion is stable.
In order to achieve the purpose, the invention provides a preparation method of phosphorus-containing palm oil-based pure water polyurethane nano emulsion, which is characterized in that raw materials used in the preparation process comprise the following components in percentage by mass:
the preparation process specifically comprises the following steps:
(1) adding palm oil, phosphoric acid and a catalyst into a three-neck flask, slowly dropwise adding hydrogen peroxide into the flask, and stirring for 5-6 hours at the temperature of 60-80 ℃; standing at room temperature for layering, pouring out the upper layer, washing with water, washing, neutralizing with neutralizer, standing for layering, removing the lower layer liquid, and vacuum-pumping for dehydration for 1h to obtain epoxy palm oil;
(2) adding epoxy palm oil into a three-neck flask, slowly heating to 70-80 ℃, and dripping a catalyst into the flask to perform reaction under the conditions of stirring and condensation; then, respectively dripping the two ring-opening agents into a flask through a separating funnel, continuously heating to 80-100 ℃ for reaction, and stirring for 5-8 hours; sampling every 30min to determine the acid value until the acid value of the system is constant, and separating to obtain the phosphorus-containing palm oil-based polyol;
(3) dehydrating the phosphorus-containing palm oil-based polyol and the oligomer polyol in a four-neck flask with a condenser, a thermometer and a stirring device at 100-120 ℃ for 60-90 min in vacuum; cooling to 90-110 ℃, adding a hydrophilic chain extender, and performing vacuum dehydration for 30-60 min; then, cooling to 75-90 ℃, dropwise adding diisocyanate under nitrogen atmosphere, reacting for 30-60 min after dropwise adding, dropwise adding a catalyst, and reacting for 40-80 min under heat preservation to obtain a phosphorus-containing palm oil-based polyurethane prepolymer;
(4) cooling to 40-60 ℃, adding a small molecular chain extender into the phosphorus-containing palm oil-based polyurethane prepolymer for reaction for 60-90 min, and if the viscosity is increased, properly adding an organic solvent for viscosity reduction;
(5) finally, cooling to 35-40 ℃, adding a neutralizer and reacting for 40-60 min;
(6) adding deionized water for emulsification, increasing the rotating speed, wherein the emulsification time is 30-40 min, and carrying out reduced pressure distillation on a sample to remove an organic solvent;
(7) and (3) placing the sample into a beaker, and homogenizing by using a D-6L ultrahigh pressure homogenizer at the homogenizing pressure of 120MPa for 4 times to prepare the phosphorus-containing palm oil-based pure water polyurethane nano emulsion.
Preferably, the diisocyanate is one or more of isophorone diisocyanate (IPDI), Toluene Diisocyanate (TDI), Hexamethylene Diisocyanate (HDI), and diphenylmethane diisocyanate (MDI).
Preferably, the oligomer polyol is one or more of polybutylene adipate (PBA), polypropylene oxide glycol (PPG), polyethylene oxide glycol (PEG), polyhexamethylene adipate glycol and palm oil.
Preferably, the hydrophilic chain extender is one or more of 2,2 '-dimethylolpropionic acid (DMPA), 2' -dimethylolbutyric acid (DMBA) and N120.
Preferably, the small-molecule chain extender is one or more of 1, 4-Butanediol (BDO), 1, 6-Hexanediol (HDO), ethylenediamine and glycerol.
Preferably, the neutralizing agent is one or more of sodium hydroxide, ammonia water, Triethylamine (TEA) and epichlorohydrin.
Preferably, the catalyst is one or more of dibutyltin dilaurate, stannous octoate, fluoroboric acid, formic acid, tetramethylbutanediamine or triethylenediamine.
Preferably, the organic solvent is one or more of acetone, methyl ethyl ketone and dimethylformamide.
Preferably, the ring-opening agent is one or more of phosphoric acid, Ethylene Glycol (EG), propylene glycol, methanol and ethanol.
The invention also provides the phosphorus-containing palm oil-based pure water polyurethane nano emulsion prepared by the method.
The invention has the beneficial effects that:
(1) according to the phosphorus-containing palm oil-based pure water polyurethane nano emulsion and the preparation method thereof, phosphoric acid and dihydric alcohol are used for carrying out ring-opening reaction on the epoxy palm oil to obtain the phosphorus-containing palm oil-based polyol, the reaction is complete, and the utilization rate is high. Phosphoric acid as an inorganic acid contains a large amount of phosphorus elements, and the phosphorus elements are used as one of ring-opening agents, so that the environmental pollution caused by an organic ring-opening agent can be avoided, the phosphorus elements can be introduced into the vegetable oil polyol to enable the vegetable oil polyol to have a certain flame retardant effect, the dihydric alcohol is used as the ring-opening agent, the ring opening of an epoxy group can be respectively performed to generate a secondary alcohol and a primary alcohol, the hydroxyl value of a product is improved, the reaction activity of the polyol product can be improved due to the existence of the primary alcohol, the production efficiency is improved, the prepared phosphorus-containing palm oil-based polyol is light in color compared with the polyol prepared from other vegetable oils, and.
(2) The phosphorus-containing palm oil-based pure water nano emulsion is prepared by a high-pressure homogenization technology, the high-pressure homogenization is an efficient manufacturing technology of the nano emulsion, and the nano emulsion prepared by the method has the advantages of uniform product, strong stability, high preparation efficiency, low dependence demand of a catalyst and an additive and the like. The main controllable equipment parameters of the high-pressure homogenizer comprise homogenizing pressure, homogenizing times, homogenizing time, homogenizing temperature and the like, the particle size distribution of the nano emulsion is usually obviously reduced along with the increase of the homogenizing pressure and the homogenizing times, and when a certain homogenizing pressure and homogenizing times are reached, the particle size changes stably to reach a nano level. The nanoemulsion prepared by the method can reduce the occurrence of gravity separation, flocculation and coalescence of liquid drops, thereby having better dynamic stability, small particle size, narrow distribution and uniform system, improving the optical definition of products, and improving the modulus, strength, flame retardance and the like after film forming.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The raw materials used in the examples of the present invention were purchased from the research platform, except for the following specific descriptions. PBA-2000 was purchased from Shanghai optimization chemical Co., Ltd, and dibutyltin dilaurate was purchased from Shanghai pharmaceutical group chemical reagents Co., Ltd.
In the embodiments of the present invention:
D-6L ultrahigh pressure homogenizer, PhD technologies, Inc., USA. The particle size of the emulsion was measured by an LS-POP (9) laser particle size analyzer, the refractive index of the medium was set to 1.76. + -. 0.05i, and the refractive index of the dispersant was set to 1.333. And testing the limiting oxygen index of the sample by using a limiting oxygen index tester according to the national standard GB/T2406.2-2009. The sample size was: 60 mm. times.10 mm. The mechanical property after film forming is measured by adopting an INSTRON5567 universal material testing machine, and the sample size is as follows: 60 mm. times.10 mm, a nip pitch of 20mm, and a drawing speed of 100 mm/mim.
Example 1
The embodiment provides a preparation method of phosphorus-containing palm oil-based pure water polyurethane nano-emulsion, which is characterized in that the raw materials used for the preparation are calculated according to mass percentage, and the composition and the mixture ratio are as follows:
the method specifically comprises the following steps:
(1) adding palm oil, formic acid and 1.023g of phosphoric acid into a three-neck flask, slowly dropwise adding hydrogen peroxide into the flask, and stirring for 8 hours at the temperature of 80 ℃; standing at room temperature for layering, pouring out the upper layer, washing with water, washing, neutralizing with sodium hydroxide solution, standing for layering, removing the lower layer liquid, and vacuum-pumping for dehydration for 1h to obtain epoxy palm oil;
(2) adding epoxy palm oil into a three-neck flask, slowly heating to 55 ℃, dripping fluoroboric acid into the flask under the conditions of stirring and condensation, and reacting for 0.5 h; dropwise adding ethylene glycol and 2.387g of phosphoric acid into the flask through a separating funnel, continuously heating to 70 ℃ for reaction, and stirring for 1.5 h; sampling every 30min to determine the acid value until the acid value of the system is constant to obtain the phosphorus-containing palm oil-based polyol, and washing the product to be neutral by using a solvent and water;
(3) dehydrating the phosphorus-containing palm oil-based polyol in a four-neck flask provided with a condenser, a thermometer and a stirring device at 120 ℃ for 90min in vacuum; cooling to 109 ℃, adding 2, 2' -dimethylolpropionic acid, and dehydrating for 30min in vacuum; then cooling to 89 ℃, dropwise adding isophorone diisocyanate under nitrogen atmosphere, reacting for 60min after dropwise adding, dropwise adding dibutyltin dilaurate, and reacting for 60min under heat preservation to obtain a phosphorus-containing palm oil-based polyurethane prepolymer;
(4) cooling to 59 ℃, adding 1, 4' -butanediol into the prepolymer for reaction for 60 min; during the period, if the viscosity is increased, properly adding acetone for reducing the viscosity;
(5) finally, cooling to 40 ℃, and adding sodium hydroxide for reaction for 40 min;
(6) adding deionized water for emulsification, increasing the rotating speed, wherein the emulsification time is 40min, and carrying out reduced pressure distillation on a sample to remove an organic solvent;
(7) and (3) placing the sample into a beaker, and homogenizing by using a D-6L ultrahigh pressure homogenizer at the homogenizing pressure of 120MPa for 4 times to prepare the phosphorus-containing palm oil-based pure water polyurethane nano emulsion.
The obtained phosphorus-containing palm oil-based waterborne polyurethane nano emulsion has the particle size of 20.07nm and the dispersion index of 0.185 measured by a particle size analyzer; the limit oxygen index is 43 percent through a limit oxygen index tester; the elastic modulus of the film of 60 mm. times.20 mm as measured by a universal material tester was 11.24 MPa.
Example 2
The preparation method of the phosphorus-containing palm oil-based pure water polyurethane nano emulsion is characterized in that the raw materials used for the preparation are calculated according to the mass percentage, and the composition and the mixture ratio are as follows:
the method specifically comprises the following steps:
(1) adding palm oil, formic acid and 1.023g of phosphoric acid into a three-neck flask, slowly dropwise adding hydrogen peroxide into the flask, and stirring for 8 hours at the temperature of 80 ℃; standing at room temperature for layering, pouring out the upper layer, washing with water, washing, neutralizing with sodium hydroxide solution, standing for layering, removing the lower layer liquid, and vacuumizing for dehydration to obtain epoxy palm oil;
(2) adding epoxy palm oil into a three-neck flask, slowly heating to 75 ℃, dripping fluoroboric acid into the flask under the conditions of stirring and condensation, and reacting for 0.5 h; respectively dripping ethylene glycol and 2.387g of phosphoric acid into the flask through a separating funnel, continuously heating to 90 ℃ for reaction, and stirring for 1.5 h; sampling every 30min to determine the acid value until the acid value of the system is constant to obtain the phosphorus-containing palm oil-based polyol, and washing the product to be neutral by using a solvent and water;
(3) dehydrating the phosphorus-containing palm oil-based polyol in a four-neck flask provided with a condenser, a thermometer and a stirring device at 120 ℃ for 90min in vacuum; cooling to 109 ℃, adding 2, 2' -dimethylolpropionic acid, and dehydrating for 30min in vacuum; then cooling to 89 ℃, dropwise adding isophorone diisocyanate under nitrogen atmosphere, reacting for 60min after dropwise adding, dropwise adding dibutyltin dilaurate, and reacting for 60min under heat preservation to obtain a phosphorus-containing palm oil-based polyurethane prepolymer;
(4) cooling to 59 ℃, adding 1, 4' -butanediol into the prepolymer for reaction for 60 min; during the period, if the viscosity is increased, properly adding acetone for reducing the viscosity;
(5) finally, cooling to 40 ℃, and adding sodium hydroxide for reaction for 40 min;
(6) adding deionized water for emulsification, increasing the rotating speed, wherein the emulsification time is 40min, and carrying out reduced pressure distillation on a sample to remove an organic solvent;
(7) and (3) placing the sample into a beaker, and homogenizing by using a D-6L ultrahigh pressure homogenizer at the homogenizing pressure of 120MPa for 4 times to prepare the phosphorus-containing palm oil-based pure water polyurethane nano emulsion.
The obtained phosphorus-containing palm oil-based pure water polyurethane nano emulsion has the particle size of 24.12nm and the dispersion index of 0.211 measured by a particle size analyzer; the limited oxygen index is 31 percent through a limited oxygen index tester; the elastic modulus of the film of 60 mm. times.20 mm as measured by a universal material tester was 9.83 MPa.
Example 3
The preparation method of the phosphorus-containing palm oil-based pure water polyurethane nano emulsion is characterized in that the raw materials used for the preparation are calculated according to the mass percentage, and the composition and the mixture ratio are as follows:
the method specifically comprises the following steps:
(1) adding palm oil, formic acid and 1.023g of phosphoric acid into a three-neck flask, slowly dropwise adding hydrogen peroxide into the flask, and stirring for 8 hours at the temperature of 80 ℃; standing at room temperature for layering, pouring out the upper layer, washing with water, washing, neutralizing with sodium hydroxide solution, standing for layering, removing the lower layer liquid, and vacuumizing for dehydration to obtain epoxy palm oil;
(2) adding epoxy palm oil into a three-neck flask, slowly heating to 75 ℃, dripping fluoroboric acid into the flask under the conditions of stirring and condensation, and reacting for 0.5 h; respectively dripping ethylene glycol and 2.387g of phosphoric acid into the flask through a separating funnel, continuously heating to 90 ℃ for reaction, and stirring for 1.5 h; sampling every 30min to determine the acid value until the acid value of the system is constant to obtain the phosphorus-containing palm oil-based polyol, and washing the product to be neutral by using a solvent and water;
(3) dehydrating the phosphorus-containing palm oil-based polyol in a four-neck flask provided with a condenser, a thermometer and a stirring device at 120 ℃ for 90min in vacuum; cooling to 109 ℃, adding 2, 2' -dimethylolpropionic acid, and dehydrating for 30min in vacuum; then cooling to 89 ℃, dropwise adding isophorone diisocyanate under nitrogen atmosphere, reacting for 60min after dropwise adding, dropwise adding dibutyltin dilaurate, and reacting for 60min under heat preservation to obtain a phosphorus-containing palm oil-based polyurethane prepolymer;
(4) cooling to 59 ℃, adding 1, 4' -butanediol into the prepolymer for reaction for 60 min; if the viscosity is increased in the period, properly adding an organic solvent for reducing the viscosity;
(5) finally, cooling to 40 ℃, and adding sodium hydroxide for reaction for 40 min;
(6) adding deionized water for emulsification, increasing the rotating speed, wherein the emulsification time is 40min, and carrying out reduced pressure distillation on a sample to remove an organic solvent;
(7) and (3) placing the sample into a beaker, and homogenizing by using a D-6L ultrahigh pressure homogenizer at the homogenizing pressure of 120MPa for 4 times to prepare the phosphorus-containing palm oil-based pure water polyurethane nano emulsion.
The obtained phosphorus-containing palm oil-based pure water polyurethane nano emulsion has the particle size of 25.31nm and the dispersion index of 0.403 measured by a particle size analyzer; the limited oxygen index is 29 percent through a limited oxygen index tester; the elastic modulus of the film of 60 mm. times.20 mm as measured by a universal material tester was 8.02 MPa.
The above description is only a basic description of the present invention, and any equivalent changes made according to the technical solution of the present invention should fall within the protection scope of the present invention.
Claims (10)
1. The preparation method of the phosphorus-containing palm oil-based pure water polyurethane nano emulsion is characterized in that raw materials used in the preparation process are calculated according to mass percentage, and the composition and the proportion are as follows:
the preparation process specifically comprises the following steps:
(1) adding palm oil, phosphoric acid and a catalyst into a three-neck flask, slowly dropwise adding hydrogen peroxide into the flask, and stirring for 5-6 hours at the temperature of 60-80 ℃; standing at room temperature for layering, pouring out the upper layer, washing with water, washing, neutralizing with neutralizer, standing for layering, removing the lower layer liquid, and vacuum-pumping for dehydration for 1h to obtain epoxy palm oil;
(2) adding epoxy palm oil into a three-neck flask, slowly heating to 70-80 ℃, and dripping a catalyst into the flask to perform reaction under the conditions of stirring and condensation; then, respectively dripping the two ring-opening agents into a flask through a separating funnel, continuously heating to 80-100 ℃ for reaction, and stirring for 5-8 hours; sampling every 30min to determine the acid value until the acid value of the system is constant, and separating to obtain the phosphorus-containing palm oil-based polyol;
(3) dehydrating the phosphorus-containing palm oil-based polyol and the oligomer polyol in a four-neck flask with a condenser, a thermometer and a stirring device at 100-120 ℃ for 60-90 min in vacuum; cooling to 90-110 ℃, adding a hydrophilic chain extender, and performing vacuum dehydration for 30-60 min; then, cooling to 75-90 ℃, dropwise adding diisocyanate under nitrogen atmosphere, reacting for 30-60 min after dropwise adding, dropwise adding a catalyst, and reacting for 40-80 min under heat preservation to obtain a phosphorus-containing palm oil-based polyurethane prepolymer;
(4) cooling to 40-60 ℃, adding a small molecular chain extender into the phosphorus-containing palm oil-based polyurethane prepolymer for reaction for 60-90 min, and if the viscosity is increased, properly adding an organic solvent for viscosity reduction;
(5) finally, cooling to 35-40 ℃, adding a neutralizer and reacting for 40-60 min;
(6) adding deionized water for emulsification, increasing the rotating speed, wherein the emulsification time is 30-40 min, and carrying out reduced pressure distillation on a sample to remove an organic solvent;
(7) and (3) placing the sample into a beaker, and homogenizing by using a D-6L ultrahigh pressure homogenizer at the homogenizing pressure of 120MPa for 4 times to prepare the phosphorus-containing palm oil-based pure water polyurethane nano emulsion.
2. The method for preparing the phosphorus-containing palm oil-based pure water polyurethane nanoemulsion as claimed in claim 1, wherein the diisocyanate is one or more of isophorone diisocyanate, toluene diisocyanate, hexamethylene diisocyanate and diphenylmethane diisocyanate.
3. The method for preparing the phosphorus-containing palm oil-based pure water polyurethane nanoemulsion as claimed in claim 1, wherein the oligomer polyol is one or more of polybutylene adipate, polypropylene oxide glycol, polyethylene oxide glycol, polyhexamethylene adipate and palm oil.
4. The method for preparing the phosphorus-containing palm oil-based pure water polyurethane nanoemulsion as claimed in claim 1, wherein the hydrophilic chain extender is one or more of 2,2 '-dimethylolpropionic acid, 2' -dimethylolbutyric acid and N120.
5. The method for preparing the phosphorus-containing palm oil-based pure water polyurethane nanoemulsion as claimed in claim 1, wherein the small-molecule chain extender is one or more of 1, 4-butanediol, 1, 6-hexanediol, ethylenediamine and glycerol.
6. The method for preparing the phosphorus-containing palm oil-based pure water polyurethane nanoemulsion as claimed in claim 1, wherein the neutralizer is one or more of sodium hydroxide, ammonia water, triethylamine and epichlorohydrin.
7. The method of preparing the phosphorus-containing palm oil-based pure water polyurethane nanoemulsion of claim 1, wherein the catalyst is one or more of dibutyltin dilaurate, stannous octoate, fluoroboric acid, formic acid, tetramethylbutanediamine, or triethylenediamine.
8. The method for preparing the phosphorus-containing palm oil-based pure water polyurethane nanoemulsion as claimed in claim 1, wherein the organic solvent is one or more of acetone, methyl ethyl ketone and dimethylformamide.
9. The method for preparing the phosphorus-containing palm oil-based pure water polyurethane nanoemulsion as claimed in claim 1, wherein the ring-opening agent is one or more of phosphoric acid, ethylene glycol, propylene glycol, methanol and ethanol.
10. The phosphorus-containing palm oil-based pure water polyurethane nano-emulsion prepared by the method of any one of claims 1 to 9.
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