CN110540630B - Waterborne polyurethane composition and preparation method thereof - Google Patents
Waterborne polyurethane composition and preparation method thereof Download PDFInfo
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- CN110540630B CN110540630B CN201910947702.3A CN201910947702A CN110540630B CN 110540630 B CN110540630 B CN 110540630B CN 201910947702 A CN201910947702 A CN 201910947702A CN 110540630 B CN110540630 B CN 110540630B
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Abstract
The invention relates to the technical field of fine chemicals, in particular to an aqueous polyurethane composition which is prepared by chain extension of a polyurethane prepolymer, end capping and blending, has high solid content and low viscosity, is convenient for industrial production, and can be applied as a coating and an adhesive. The aqueous polyurethane composition has low viscosity, is convenient to prepare and use, and is non-toxic and environment-friendly. The solid content of the waterborne polyurethane composition obtained by the invention can reach more than 65%, the lowest viscosity is 200mPa & s, and the tensile strength of a glue film can reach 64.7 MPa.
Description
Technical Field
The invention belongs to the technical field of fine chemicals, and particularly relates to a waterborne polyurethane composition and a preparation method thereof.
Background
Polyurethane is widely used in the fields of paint industry, leather industry, textile printing and dyeing industry and the like, and comprises two main types of solvent-type polyurethane and waterborne polyurethane, wherein the waterborne polyurethane takes water as a medium and has the advantages of no toxicity, low price, safety and the like, so that the waterborne polyurethane has the tendency of replacing the solvent-type polyurethane. The waterborne polyurethane is a novel waterborne polymer material with strong designability and environmental protection, and the development of the waterborne polyurethane at home is laggard than that at abroad, the waterborne polyurethane has low solid content, low bonding strength and inferior film forming mechanical property.
The water-based polyurethane takes water as a dispersion medium, and the evaporation latent heat of the water is larger than that of the traditional organic solvent, so that the drying speed of the water-based polyurethane is relatively slow, and the construction efficiency is influenced. Increasing the solid content is an effective way to solve the problem, but the high solid content can increase the viscosity, which causes some inconvenience in the process of producing the product, thereby affecting the production efficiency and being not beneficial to industrial production.
Disclosure of Invention
In order to overcome the technical problems, the invention provides the waterborne polyurethane composition which is obtained by chain extension of a polyurethane prepolymer, end capping and blending, has high solid content and low viscosity and is convenient for industrial production.
The technical scheme for solving the technical problems is as follows:
the waterborne polyurethane composition comprises the following components in percentage by mass:
15-40% of polyhydric alcohol
12 to 20 percent of diisocyanate
0.1 to 0.5 percent of dibutyltin dilaurate
1 to 5 percent of hydrophilic chain extender
1 to 5 percent of lipophilic chain extender
Chain extension solvent 3-5%
0.1 to 0.5 percent of cross-linking agent
35 to 55 percent of deionized water
A proper amount of pH value regulator;
the pH value regulator controls the pH value of the aqueous polyurethane composition to be 7.5-8.5;
the aqueous polyurethane composition is prepared by taking polyol and diisocyanate as polymerization raw materials, polymerizing to form a polyurethane prepolymer, and performing chain extension and end capping under different conditions and then re-mixing, wherein the chain extension is prepared by adding a chain extender and a cross-linking agent into the polyurethane prepolymer for reaction.
Further, the polyol is one or two of polycarbonate diol, polyether diol or polyester diol with the number average molecular weight of 1000-3000.
The diisocyanate is any one of isophorone diisocyanate, diphenylmethane diisocyanate or hexamethylene diisocyanate.
Further, the hydrophilic chain extender is dimethylolbutyric acid, the lipophilic chain extender is 1, 4-butanediol, and the chain extension solvent is acetone or N-methylpyrrolidone.
Further, the cross-linking agent is trimethylolpropane.
Further, the equivalent ratio of NCO groups to hydroxyl groups of the aqueous polyurethane composition is 1-3.5: 1.
The invention also provides a preparation method of the waterborne polyurethane composition, which comprises the following steps:
1) preparing raw materials according to the formula of claim 1;
2) carrying out polymerization reaction by taking polyol and diisocyanate as raw materials to form a polyurethane prepolymer;
3) adding half amount of hydrophilic chain extender, lipophilic chain extender and cross-linking agent in the formula into the polyurethane prepolymer for chain extension reaction, wherein the chain extension temperature is 70-75 ℃, and the chain extension is carried out for 2 hours; in the chain extension process, adding half of chain extension solvent in the formula in batches for multiple times, after the chain extension reaction reaches the time, adding organic functional silane into a reaction vessel to carry out end capping reaction on the polymer, wherein the end capping temperature is 35-38 ℃, the end capping time is not less than 30min, starting stirring after the end capping is finished, adding half of deionized water in the formula under the stirring frequency of 2500 plus 2800r/min, emulsifying and dispersing until the mixture is uniform, adjusting the pH value of the emulsion to 7.5-8.5 by using a pH value regulator, and removing the solvent to obtain waterborne polyurethane A;
4) adding half amount of hydrophilic chain extender, lipophilic chain extender and cross-linking agent in the formula into the polyurethane prepolymer for chain extension reaction, wherein the chain extension temperature is 75-80 ℃, and the chain extension is carried out for 2 hours; in the chain extension process, adding half of the chain extension solvent in the formula in batches for multiple times, after the chain extension reaction reaches the time, adding organic functional silane into a reaction container to carry out end capping reaction on the polymer, wherein the end capping temperature is 35-38 ℃, the end capping time is not less than 30min, starting stirring after the end capping is finished, adding half of deionized water in the formula under the stirring frequency of 150-800r/min, emulsifying and dispersing until the mixture is uniform, adjusting the pH value of the emulsion to 7.5-8.5 by using a pH value regulator, and removing the solvent to obtain waterborne polyurethane B;
5) slowly dripping the waterborne polyurethane A obtained in the step 3) into the waterborne polyurethane B obtained in the step 4) according to a proportion to form a waterborne polyurethane composition.
In step 2), the polyurethane prepolymer is prepared by adding polyol into a dry reactor, heating the reactor to 85-90 ℃, adding diisocyanate and a catalyst dibutyltin dilaurate into the reactor, and polymerizing for 1-4 hours.
Further, the mass ratio of the aqueous polyurethane A to the aqueous polyurethane B in the step 5) is 1: 1-3.
The invention has the beneficial effects that:
the invention provides the mixed waterborne polyurethane with high solid content, which can be applied as a coating and an adhesive. The aqueous polyurethane composition has low viscosity, is convenient to prepare and use, and is non-toxic and environment-friendly. According to the invention, polyurethane prepolymers are subjected to chain extension and end capping, different conditions of chain extension and end capping are adjusted to obtain polyurethanes with different structures, and the polyurethanes are emulsified and then mixed, so that branched chains of the polyurethanes are attached to each other, the viscosity is not synchronously increased while the solid content is increased, the mechanical property is greatly improved, through tests, the solid content of the waterborne polyurethane composition obtained by the invention can reach more than 65%, the lowest viscosity is 200mPa & s, and the tensile strength of a glue film can reach 64.7 MPa.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Example 1:
the waterborne polyurethane composition comprises the following components in percentage by mass:
30 percent of polyol
Diisocyanate 15%
0.5 percent of dibutyltin dilaurate
3.5 percent of hydrophilic chain extender
2 percent of lipophilic chain extender
Chain extension solvent 3%
0.5 percent of cross-linking agent
Mixing the above materials with deionized water to obtain a mixture (100%)
A proper amount of pH value regulator;
the pH value regulator controls the pH value of the aqueous polyurethane composition to be 7.5-8.5;
the aqueous polyurethane composition is prepared by taking polyol and diisocyanate as polymerization raw materials, polymerizing to form a polyurethane prepolymer, and performing chain extension and end capping under different conditions and then re-mixing, wherein the chain extension is prepared by adding a chain extender and a cross-linking agent into the polyurethane prepolymer for reaction.
The polyol is a polycarbonate diol having a number average molecular weight of 1000-3000.
The diisocyanate is isophorone diisocyanate.
The hydrophilic chain extender is dimethylolbutyric acid, the lipophilic chain extender is 1, 4-butanediol, and the chain extension solvent is N-methylpyrrolidone.
The cross-linking agent is trimethylolpropane.
The equivalent ratio of NCO groups to hydroxyl groups of the aqueous polyurethane composition is 3.5: 1.
The preparation method comprises the following steps:
1) preparing raw materials according to the formula of claim 1;
2) carrying out polymerization reaction by taking polyol and diisocyanate as raw materials to form a polyurethane prepolymer; the polyurethane prepolymer is prepared by adding polyol into a dry reactor, heating the reactor to 85 ℃, then adding diisocyanate and a catalyst dibutyltin dilaurate into the reactor, and polymerizing for 2 hours;
3) adding half amount of hydrophilic chain extender, lipophilic chain extender and cross-linking agent in the formula into the polyurethane prepolymer for chain extension reaction, wherein the chain extension temperature is 70 ℃, and the chain extension is carried out for 2 hours; in the chain extension process, adding half of chain extension solvent in the formula in batches for multiple times, adding organic functional silane into a reaction container to carry out end capping reaction on a polymer after the chain extension reaction reaches the time, wherein the end capping temperature is 35 ℃, the end capping time is not less than 30min, starting stirring after the end capping is finished, adding half of deionized water in the formula under the stirring frequency of 2500r/min, emulsifying and dispersing until the mixture is uniform, adjusting the pH value of the emulsion to 7.5-8.5 by using a pH value regulator, and removing the solvent to obtain waterborne polyurethane A;
4) adding half amount of hydrophilic chain extender, lipophilic chain extender and cross-linking agent in the formula into the polyurethane prepolymer for chain extension reaction, wherein the chain extension temperature is 80 ℃, and the chain extension is carried out for 2 hours; in the chain extension process, adding half of chain extension solvent in the formula in batches for multiple times, adding organic functional silane into a reaction container to carry out end capping reaction on a polymer after the chain extension reaction reaches the time, wherein the end capping temperature is 35 ℃, the end capping time is not less than 30min, starting stirring after the end capping is finished, adding half of deionized water in the formula under the stirring frequency of 150r/min, emulsifying and dispersing until the mixture is uniform, adjusting the pH value of the emulsion to 7.5-8.5 by using a pH value regulator, and removing the solvent to obtain waterborne polyurethane B;
5) slowly dripping the waterborne polyurethane A obtained in the step 3) into the waterborne polyurethane B obtained in the step 4) according to a proportion to form a waterborne polyurethane composition, wherein the mass ratio of the waterborne polyurethane A to the waterborne polyurethane B is 1:1.
The solid content of the waterborne polyurethane composition obtained by the invention can reach more than 65%, the viscosity is 200mPa & s, and the tensile strength of a glue film is 64.7 MPa.
Example 2:
the waterborne polyurethane composition comprises the following components in percentage by mass:
15 percent of polyol
Diisocyanate 20%
0.1 percent of dibutyltin dilaurate
5 percent of hydrophilic chain extender
Lipophilic chain extender 5%
Chain extension solvent 5%
0.4 percent of cross-linking agent
Mixing the above materials with deionized water to obtain a mixture (100%)
A proper amount of pH value regulator;
the pH value regulator controls the pH value of the aqueous polyurethane composition to be 7.5-8.5;
the aqueous polyurethane composition is prepared by taking polyol and diisocyanate as polymerization raw materials, polymerizing to form a polyurethane prepolymer, and performing chain extension and end capping under different conditions and then re-mixing, wherein the chain extension is prepared by adding a chain extender and a cross-linking agent into the polyurethane prepolymer for reaction.
The polyalcohol is polyether diol.
The diisocyanate is diphenylmethane diisocyanate.
The hydrophilic chain extender is dimethylolbutyric acid, the lipophilic chain extender is 1, 4-butanediol, and the chain extension solvent is acetone.
The cross-linking agent is trimethylolpropane.
The equivalent ratio of NCO groups to hydroxyl groups of the aqueous polyurethane composition is 1:1.
The preparation method comprises the following steps:
1) preparing raw materials according to the formula of claim 1;
2) carrying out polymerization reaction by taking polyol and diisocyanate as raw materials to form a polyurethane prepolymer; the polyurethane prepolymer is prepared by adding polyol into a dry reactor, heating the reactor to 90 ℃, then adding diisocyanate and a catalyst dibutyltin dilaurate into the reactor, and polymerizing for 1 h;
3) adding half amount of hydrophilic chain extender, lipophilic chain extender and cross-linking agent in the formula into the polyurethane prepolymer for chain extension reaction, wherein the chain extension temperature is 75 ℃, and the chain extension is carried out for 2 hours; in the chain extension process, adding half of chain extension solvent in the formula in batches for multiple times, adding organic functional silane into a reaction container to carry out end capping reaction on a polymer after the chain extension reaction reaches the time, wherein the end capping temperature is 38 ℃, the end capping time is not less than 30min, starting stirring after the end capping is finished, adding half of deionized water in the formula under the stirring frequency of 2800r/min, emulsifying and dispersing until the mixture is uniform, adjusting the pH value of the emulsion to 7.5-8.5 by using a pH value regulator, and removing the solvent to obtain waterborne polyurethane A;
4) adding half amount of hydrophilic chain extender, lipophilic chain extender and cross-linking agent in the formula into the polyurethane prepolymer for chain extension reaction, wherein the chain extension temperature is 80 ℃, and the chain extension is carried out for 2 hours; in the chain extension process, adding half of chain extension solvent in the formula in batches for multiple times, adding organic functional silane into a reaction container to carry out end capping reaction on a polymer after the chain extension reaction reaches the time, wherein the end capping temperature is 38 ℃, the end capping time is not less than 30min, starting stirring after the end capping is finished, adding half of deionized water in the formula under the stirring frequency of 800r/min, emulsifying and dispersing until the mixture is uniform, adjusting the pH value of the emulsion to 7.5-8.5 by using a pH value regulator, and removing the solvent to obtain waterborne polyurethane B;
5) slowly dripping the waterborne polyurethane A obtained in the step 3) into the waterborne polyurethane B obtained in the step 4) according to a proportion to form a waterborne polyurethane composition, wherein the mass ratio of the waterborne polyurethane A to the waterborne polyurethane B is 1: 3.
The solid content of the waterborne polyurethane composition obtained by the invention can reach more than 65%, the viscosity is 240mPa & s, and the tensile strength of a glue film is 59.1 MPa.
Example 3:
the waterborne polyurethane composition comprises the following components in percentage by mass:
40 percent of polyol
Diisocyanate 12%
0.5 percent of dibutyltin dilaurate
1 percent of hydrophilic chain extender
Lipophilic chain extender 1.5%
Chain extension solvent 3%
0.1% of cross-linking agent
Mixing the above materials with deionized water to obtain a mixture (100%)
A proper amount of pH value regulator;
the pH value regulator controls the pH value of the aqueous polyurethane composition to be 7.5-8.5;
the aqueous polyurethane composition is prepared by taking polyol and diisocyanate as polymerization raw materials, polymerizing to form a polyurethane prepolymer, and performing chain extension and end capping under different conditions and then re-mixing, wherein the chain extension is prepared by adding a chain extender and a cross-linking agent into the polyurethane prepolymer for reaction.
The polyalcohol is polyester dihydric alcohol.
The hexamethylene diisocyanate.
The hydrophilic chain extender is dimethylolbutyric acid, the lipophilic chain extender is 1, 4-butanediol, and the chain extension solvent is acetone.
The cross-linking agent is trimethylolpropane.
The equivalent ratio of NCO groups to hydroxyl groups of the aqueous polyurethane composition is 2: 1.
The preparation method comprises the following steps:
1) preparing raw materials according to the formula of claim 1;
2) carrying out polymerization reaction by taking polyol and diisocyanate as raw materials to form a polyurethane prepolymer; the polyurethane prepolymer is prepared by adding polyol into a dry reactor, heating the reactor to 85 ℃, then adding diisocyanate and a catalyst dibutyltin dilaurate into the reactor, and polymerizing for 4 hours;
3) adding half amount of hydrophilic chain extender, lipophilic chain extender and cross-linking agent in the formula into the polyurethane prepolymer for chain extension reaction, wherein the chain extension temperature is 72 ℃, and the chain extension is carried out for 2 hours; in the chain extension process, adding half of chain extension solvent in the formula in batches for multiple times, after the chain extension reaction reaches the time, adding organic functional silane into a reaction container to carry out end capping reaction on a polymer, wherein the end capping temperature is 36 ℃, the end capping time is not less than 30min, starting stirring after the end capping is finished, adding half of deionized water in the formula under the stirring frequency of 2600r/min, emulsifying and dispersing until the mixture is uniform, adjusting the pH value of the emulsion to be 7.5-8.5 by using a pH value regulator, and removing the solvent to obtain waterborne polyurethane A;
4) adding half amount of hydrophilic chain extender, lipophilic chain extender and cross-linking agent in the formula into the polyurethane prepolymer for chain extension reaction, wherein the chain extension temperature is 78 ℃, and the chain extension is carried out for 2 hours; in the chain extension process, adding half of chain extension solvent in the formula in batches for multiple times, adding organic functional silane into a reaction container to carry out end capping reaction on a polymer after the chain extension reaction reaches the time, wherein the end capping temperature is 35 ℃, the end capping time is not less than 30min, starting stirring after the end capping is finished, adding half of deionized water in the formula under the stirring frequency of 500r/min, emulsifying and dispersing until the mixture is uniform, adjusting the pH value of the emulsion to 7.5-8.5 by using a pH value regulator, and removing the solvent to obtain waterborne polyurethane B;
5) slowly dripping the waterborne polyurethane A obtained in the step 3) into the waterborne polyurethane B obtained in the step 4) according to a proportion to form a waterborne polyurethane composition, wherein the mass ratio of the waterborne polyurethane A to the waterborne polyurethane B is 1: 2.
The solid content of the waterborne polyurethane composition obtained by the invention can reach more than 65%, the viscosity is 224mPa & s, and the tensile strength of a glue film is 62.5 MPa.
Example 4:
the waterborne polyurethane composition comprises the following components in percentage by mass:
35 percent of polyol
18% of diisocyanate
0.25 percent of dibutyltin dilaurate
4 percent of hydrophilic chain extender
3 percent of lipophilic chain extender
Chain extension solvent 4.4%
0.35 percent of cross-linking agent
Mixing the above materials with deionized water to obtain a mixture (100%)
A proper amount of pH value regulator;
the pH value regulator controls the pH value of the aqueous polyurethane composition to be 7.5-8.5;
the aqueous polyurethane composition is prepared by taking polyol and diisocyanate as polymerization raw materials, polymerizing to form a polyurethane prepolymer, and performing chain extension and end capping under different conditions and then re-mixing, wherein the chain extension is prepared by adding a chain extender and a cross-linking agent into the polyurethane prepolymer for reaction.
The polyol is a mixture of polycarbonate diol with the number average molecular weight of 1000-3000 and polyether diol according to the mass ratio of 1:1.
The diisocyanate is isophorone diisocyanate.
The hydrophilic chain extender is dimethylolbutyric acid, the lipophilic chain extender is 1, 4-butanediol, and the chain extension solvent is N-methylpyrrolidone.
The cross-linking agent is trimethylolpropane.
The equivalent ratio of NCO groups to hydroxyl groups of the aqueous polyurethane composition is 2.5: 1.
The preparation method comprises the following steps:
1) preparing raw materials according to the formula of claim 1;
2) carrying out polymerization reaction by taking polyol and diisocyanate as raw materials to form a polyurethane prepolymer; the polyurethane prepolymer is prepared by adding polyol into a dry reactor, heating the reactor to 88 ℃, then adding diisocyanate and a catalyst dibutyltin dilaurate into the reactor, and polymerizing for 2.5 hours;
3) adding half amount of hydrophilic chain extender, lipophilic chain extender and cross-linking agent in the formula into the polyurethane prepolymer for chain extension reaction, wherein the chain extension temperature is 72 ℃, and the chain extension is carried out for 2 hours; in the chain extension process, adding half of chain extension solvent in the formula in batches for multiple times, adding organic functional silane into a reaction container to carry out end capping reaction on a polymer after the chain extension reaction reaches the time, wherein the end capping temperature is 37 ℃, the end capping time is not less than 30min, starting stirring after the end capping is finished, adding half of deionized water in the formula under the stirring frequency of 2750r/min, emulsifying and dispersing until the mixture is uniform, adjusting the pH value of the emulsion to 7.5-8.5 by using a pH value regulator, and removing the solvent to obtain waterborne polyurethane A;
4) adding half amount of hydrophilic chain extender, lipophilic chain extender and cross-linking agent in the formula into the polyurethane prepolymer for chain extension reaction, wherein the chain extension temperature is 78 ℃, and the chain extension is carried out for 2 hours; in the chain extension process, adding half of chain extension solvent in the formula in batches for multiple times, adding organic functional silane into a reaction container to carry out end capping reaction on a polymer after the chain extension reaction reaches the time, wherein the end capping temperature is 37 ℃, the end capping time is not less than 30min, starting stirring after the end capping is finished, adding half of deionized water in the formula under the stirring frequency of 700r/min, emulsifying and dispersing until the mixture is uniform, adjusting the pH value of the emulsion to 7.5-8.5 by using a pH value regulator, and removing the solvent to obtain waterborne polyurethane B;
5) slowly dripping the waterborne polyurethane A obtained in the step 3) into the waterborne polyurethane B obtained in the step 4) according to a proportion to form a waterborne polyurethane composition, wherein the mass ratio of the waterborne polyurethane A to the waterborne polyurethane B is 1: 1.5.
The solid content of the waterborne polyurethane composition obtained by the invention can reach more than 65%, the viscosity is 215mPa & s, and the tensile strength of a glue film is 63.9 MPa.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiment according to the present invention are within the scope of the present invention.
Claims (7)
1. The waterborne polyurethane composition is characterized by comprising the following components in percentage by mass:
15-40% of polyhydric alcohol
12 to 20 percent of diisocyanate
0.1 to 0.5 percent of dibutyltin dilaurate
1 to 5 percent of hydrophilic chain extender
1 to 5 percent of lipophilic chain extender
Chain extension solvent 3-5%
0.1 to 0.5 percent of cross-linking agent
35 to 55 percent of deionized water
A proper amount of pH value regulator;
the pH value regulator controls the pH value of the aqueous polyurethane composition to be 7.5-8.5;
the aqueous polyurethane composition is prepared by taking polyol and diisocyanate as polymerization raw materials, forming a polyurethane prepolymer after polymerization, and then performing chain extension and end capping under different conditions and re-blending, wherein the chain extension is prepared by adding a chain extender and a cross-linking agent into the polyurethane prepolymer for reaction;
the re-mixing after the chain extension and the end capping is carried out according to the following steps:
1) adding half amount of hydrophilic chain extender, lipophilic chain extender and cross-linking agent in the formula into the polyurethane prepolymer for chain extension reaction, wherein the chain extension temperature is 70-75 ℃, and the chain extension is carried out for 2 hours; in the chain extension process, adding half of chain extension solvent in the formula in batches for multiple times, after the chain extension reaction reaches the time, adding organic functional silane into a reaction vessel to carry out end capping reaction on the polymer, wherein the end capping temperature is 35-38 ℃, the end capping time is not less than 30min, starting stirring after the end capping is finished, adding half of deionized water in the formula under the stirring frequency of 2500 plus 2800r/min, emulsifying and dispersing until the mixture is uniform, adjusting the pH value of the emulsion to 7.5-8.5 by using a pH value regulator, and removing the solvent to obtain waterborne polyurethane A;
2) adding half amount of hydrophilic chain extender, lipophilic chain extender and cross-linking agent in the formula into the polyurethane prepolymer for chain extension reaction, wherein the chain extension temperature is 75-80 ℃, and the chain extension is carried out for 2 hours; in the chain extension process, adding half of the chain extension solvent in the formula in batches for multiple times, after the chain extension reaction reaches the time, adding organic functional silane into a reaction container to carry out end capping reaction on the polymer, wherein the end capping temperature is 35-38 ℃, the end capping time is not less than 30min, starting stirring after the end capping is finished, adding half of deionized water in the formula under the stirring frequency of 150-800r/min, emulsifying and dispersing until the mixture is uniform, adjusting the pH value of the emulsion to 7.5-8.5 by using a pH value regulator, and removing the solvent to obtain waterborne polyurethane B;
3) mixing the waterborne polyurethane A obtained in the step 1) and the waterborne polyurethane B obtained in the step 2) in proportion;
the hydrophilic chain extender is dimethylolbutyric acid, the lipophilic chain extender is 1, 4-butanediol, and the chain extension solvent is acetone or N-methylpyrrolidone;
the equivalent ratio of NCO groups to hydroxyl groups of the aqueous polyurethane composition is 1-3.5: 1.
2. The aqueous polyurethane composition as claimed in claim 1, wherein the polyol is one or two of polycarbonate diol, polyether diol or polyester diol having a number average molecular weight of 1000-3000.
3. The aqueous polyurethane composition of claim 1, wherein the diisocyanate is any one of isophorone diisocyanate, diphenylmethane diisocyanate, or hexamethylene diisocyanate.
4. The aqueous polyurethane composition of claim 1, wherein the crosslinking agent is trimethylolpropane.
5. The method for producing the aqueous polyurethane composition according to any one of claims 1 to 4, characterized by comprising the steps of:
1) preparing raw materials according to the formula of claim 1;
2) carrying out polymerization reaction by taking polyol and diisocyanate as raw materials to form a polyurethane prepolymer;
3) adding half amount of hydrophilic chain extender, lipophilic chain extender and cross-linking agent in the formula into the polyurethane prepolymer for chain extension reaction, wherein the chain extension temperature is 70-75 ℃, and the chain extension is carried out for 2 hours; in the chain extension process, adding half of chain extension solvent in the formula in batches for multiple times, after the chain extension reaction reaches the time, adding organic functional silane into a reaction vessel to carry out end capping reaction on the polymer, wherein the end capping temperature is 35-38 ℃, the end capping time is not less than 30min, starting stirring after the end capping is finished, adding half of deionized water in the formula under the stirring frequency of 2500 plus 2800r/min, emulsifying and dispersing until the mixture is uniform, adjusting the pH value of the emulsion to 7.5-8.5 by using a pH value regulator, and removing the solvent to obtain waterborne polyurethane A;
4) adding half amount of hydrophilic chain extender, lipophilic chain extender and cross-linking agent in the formula into the polyurethane prepolymer for chain extension reaction, wherein the chain extension temperature is 75-80 ℃, and the chain extension is carried out for 2 hours; in the chain extension process, adding half of the chain extension solvent in the formula in batches for multiple times, after the chain extension reaction reaches the time, adding organic functional silane into a reaction container to carry out end capping reaction on the polymer, wherein the end capping temperature is 35-38 ℃, the end capping time is not less than 30min, starting stirring after the end capping is finished, adding half of deionized water in the formula under the stirring frequency of 150-800r/min, emulsifying and dispersing until the mixture is uniform, adjusting the pH value of the emulsion to 7.5-8.5 by using a pH value regulator, and removing the solvent to obtain waterborne polyurethane B;
5) slowly dripping the waterborne polyurethane A obtained in the step 3) into the waterborne polyurethane B obtained in the step 4) according to a proportion to form a waterborne polyurethane composition.
6. The method for producing an aqueous polyurethane composition according to claim 5,
the polyurethane prepolymer in the step 2) is obtained by adding polyol into a dry reactor, heating the reactor to 85-90 ℃, then adding diisocyanate and a catalyst dibutyltin dilaurate into the reactor, and polymerizing for 1-4 h.
7. The method for producing an aqueous polyurethane composition according to claim 5,
the mass ratio of the waterborne polyurethane A to the waterborne polyurethane B in the step 5) is 1: 1-3.
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