CN113717630A - Bio-based polyurethane coating and preparation method thereof - Google Patents
Bio-based polyurethane coating and preparation method thereof Download PDFInfo
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- CN113717630A CN113717630A CN202110957744.2A CN202110957744A CN113717630A CN 113717630 A CN113717630 A CN 113717630A CN 202110957744 A CN202110957744 A CN 202110957744A CN 113717630 A CN113717630 A CN 113717630A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3218—Polyhydroxy compounds containing cyclic groups having at least one oxygen atom in the ring
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/36—Hydroxylated esters of higher fatty acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
- C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
- C08G18/78—Nitrogen
- C08G18/79—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
- C08G18/797—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing carbodiimide and/or uretone-imine groups
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- Polyurethanes Or Polyureas (AREA)
Abstract
The invention discloses a bio-based polyurethane coating and a preparation method thereof. The bio-based polyurethane coating comprises a component A and a component B, wherein the component A and the component B are blended according to the weight ratio of (1-1.2) to 1, and the component A is prepared from the following raw materials in parts by weight: 10-20 parts of tannic acid, 50-60 parts of epoxidized soybean oil and 20-40 parts of solvent; the component B is prepared from the following raw materials in parts by weight: 40-50 parts of liquefied MDI and 1-2 parts of triphenyl phosphine. The application is through mutual cross-linking solidification of tannic acid, epoxidized soybean oil and liquefied MDI three, and the cross-linking density when having shown to increase bio-based polyurethane coating solidification to promote bio-based polyurethane coating's water proofness and solvent resistance.
Description
Technical Field
The invention relates to the field of coatings, in particular to a bio-based polyurethane coating and a preparation method thereof.
Background
The main components of the polyurethane coating comprise polyol and polyisocyanate, and the polyol and the polyisocyanate are crosslinked and cured to obtain a polyurethane coating. Polyol in the traditional polyurethane coating generally comes from the petrochemical industry, and with the increasing decrease of petrochemical resources, the price of the polyol in the traditional polyurethane coating is continuously increased, so that the development of the polyurethane coating taking bio-based polyol as a raw material becomes a research hotspot at present.
The vegetable oil is a renewable resource, has wide source and low price, and is an ideal bio-based polyol source. However, vegetable oils do not contain hydroxyl groups and need to be modified to become bio-based polyols.
A common modification method for vegetable oil is an oxidative ring-opening method, which has the following principle: firstly, unsaturated vegetable oil such as soybean oil or rapeseed oil reacts with organic acid and hydrogen peroxide to form epoxy vegetable oil, and then the epoxy vegetable oil reacts with a mixed solution of methanol and water to generate vegetable oil polyalcohol. The bio-based polyurethane coating prepared from the vegetable oil polyalcohol and the polyisocyanate can be coated on outdoor equipment to form a paint film protective layer.
In view of the above-mentioned related technologies, when the bio-based polyurethane coating is used as a paint film protective layer of outdoor equipment, the bio-based polyurethane coating is corroded by solvents such as acid rain and oil stain for a long time, and is prone to damage and the like, and loses protective effect. Therefore, in order to protect outdoor equipment for a long time by the bio-based polyurethane coating, solvent resistance of the bio-based polyurethane coating needs to be improved.
Disclosure of Invention
In order to improve the solvent resistance of the bio-based polyurethane coating, the application provides the bio-based polyurethane coating and a preparation method thereof.
In a first aspect, the application provides a bio-based polyurethane coating, which adopts the following technical scheme: the bio-based polyurethane coating comprises a component A and a component B, wherein the component A and the component B are blended according to the weight ratio of (1-1.2) to 1, and the component A is prepared from the following raw materials in parts by weight: 10-20 parts of tannic acid, 50-60 parts of epoxidized soybean oil and 20-40 parts of solvent; the component B is prepared from the following raw materials in parts by weight: 40-50 parts of liquefied MDI and 1-2 parts of triphenyl phosphine.
The main components of the bio-based polyurethane coating, namely the tannic acid, the epoxidized soybean oil and the liquefied MDI, are used, and the advantages are as follows: firstly, tannic acid is a polyhydroxy compound, under the catalytic action of triphenyl phosphorus, epoxy groups of epoxidized soybean oil can react with phenolic hydroxyl groups of tannic acid, and the epoxidized soybean oil is subjected to ring opening and crosslinking with tannic acid; the epoxy group of the epoxidized soybean oil generates hydroxyl after ring opening, and the hydroxyl generated by the epoxidized soybean oil reacts with the liquefied MDI for crosslinking; the phenolic hydroxyl of the tannic acid and the isocyanate group of the liquefied MDI can also generate carbamate, so that the tannic acid, the epoxidized soybean oil and the liquefied MDI are crosslinked and cured mutually, the crosslinking density of the bio-based polyurethane coating during curing is obviously increased, and the intermolecular gap of polyurethane is reduced, so that the permeation of water molecules and solvents is hindered, and the water resistance and the solvent resistance of the bio-based polyurethane coating are obviously improved.
Secondly, the hydroxyl content of the tannic acid is high, the number of crosslinking sites is large, the reactivity is high, on one hand, the tannic acid is easier to infiltrate the surface of a substrate to be coated, so that the bio-based polyurethane coating has better adhesiveness, on the other hand, a complex crosslinking structure is easier to form among polyurethane molecular chains, the cohesive energy of the polyurethane is increased, and the heat resistance of the bio-based polyurethane coating is improved.
Thirdly, the production technology of the tannic acid and the epoxidized soybean oil is mature, the price is low, the epoxidized soybean oil can directly react with the liquefied MDI under the action of the tannic acid, the ring opening treatment is not required to be carried out by using organic solutions such as methanol and the like, the energy is saved, and the bio-based polyurethane coating is more environment-friendly.
Optionally, the weight ratio of the tannic acid to the epoxidized soybean oil to the liquefied MDI is (0.2-0.3) to 1 (1-1.1).
By adopting the technical scheme, the tannic acid, the epoxidized soybean oil and the liquefied MDI have better crosslinking density within the weight ratio range, and the water resistance, the solvent resistance and the heat resistance of the bio-based polyurethane coating are further improved.
Optionally, the weight ratio of the epoxidized soybean oil to the triphenyl phosphine is 40: 1.
By adopting the technical scheme, under the weight ratio, the triphenylphosphine has the best catalytic effect on the epoxy ring-opening reaction of the epoxidized soybean oil, the reactivity between the epoxidized soybean oil and the tannic acid and the reactivity between the epoxidized soybean oil and the liquefied MDI are improved, and the water resistance, the solvent resistance and the heat resistance of the bio-based polyurethane coating are further improved.
Optionally, the weight ratio of the tannic acid to the solvent is 1: 2.
The solvent in the application includes but is not limited to volatile organic solvents such as ethyl acetate, tetrahydrofuran and the like, and the tannic acid is dissolved in the solvent, and the solvent adjusts the viscosity of the component A, so that the component A has better fluidity. And under the weight ratio, the addition of the solvent does not influence the curing rate of the bio-based polyurethane coating, and the curing rate of the bio-based polyurethane coating is higher.
Optionally, the liquefied MDI is carbodiimide-modified isocyanate.
The epoxidized soybean oil is prepared by a carboxylic acid catalytic epoxidation method, the epoxidized soybean oil contains a small amount of carboxyl, the carbodiimide modified isocyanate contains carbodiimide groups, and when the carbodiimide groups react with the carboxyl, the carboxyl is removed, the content of the carboxyl on the surface of the bio-based polyurethane coating is reduced, and the possibility that solvents such as water, alcohol solution and the like invade the bio-based polyurethane coating is further reduced.
Optionally, the content of the isocyanate group of the carbodiimide-modified isocyanate is 28-30 wt%.
Optionally, the component B also comprises a flame retardant, wherein the weight part of the flame retardant is 2-3, and the flame retardant is halogen-free phosphate.
By adopting the technical scheme, the flame retardant is selected from halogen-free phosphate ester which is a liquid flame retardant and has good compatibility with the component A and the component B, so that the coating effect of the bio-based polyurethane coating is good and the thickness is uniform on the premise of ensuring the flame retardant effect.
Optionally, the component B also comprises an antifoaming agent, and the weight part of the antifoaming agent is 2-3. The defoamer herein is preferably a silicone defoamer.
By adopting the technical scheme, the organic silicon defoaming agent is added into the bio-based polyurethane coating, so that the bio-based polyurethane coating has better foam discharging performance, and the coating effect of the bio-based polyurethane coating is improved.
In a second aspect, the application provides a preparation method of a bio-based polyurethane coating, which adopts the following technical scheme:
a preparation method of a bio-based polyurethane coating comprises the following steps:
preparation of component A: weighing tannic acid, epoxidized soybean oil and a solvent according to a formula ratio, stirring and blending, and removing water and bubbles under a vacuum condition to obtain a component A;
preparation of the component B: weighing liquefied MDI, triphenyl phosphine, a flame retardant and a defoaming agent according to the formula ratio, stirring and blending, and removing water and defoaming under a vacuum condition to obtain a component B;
when the bio-based polyurethane coating needs to be used, the component A and the component B are stirred and blended according to the weight ratio of 1 (1-1.2) to obtain the bio-based polyurethane coating, the bio-based polyurethane coating is coated and then heated to 50-60 ℃, and after heat preservation reaction for 1.5-3 hours, the bio-based polyurethane coating is cured to form a film.
By adopting the technical scheme, the A component is prepared from the tannic acid and the epoxidized soybean oil, and is stored separately from the liquefied MDI, so that the bio-based polyurethane coating has a longer shelf life. And (3) blending the component A and the component B to obtain the bio-based polyurethane coating, attaching the bio-based polyurethane coating on the surface of a coated substrate, volatilizing the solvent under the heating condition, and crosslinking and curing the bio-based polyurethane.
In summary, the present application has the following beneficial effects:
1. tannic acid and epoxy soybean oil are selected as A component to this application, and liquefied MDI is as B component, and epoxy soybean oil, tannic acid and liquefied MDI are under the triphenyl phosphorus effect, and the mutual cross-linking solidification of three makes the crosslink density of biology base polyurethane coating show the increase, has reduced the possibility that the solvent invaded polyurethane intermolecular, improves the solvent resistance and the water proofness of polyurethane.
2. In the application, the carbodiimide modified isocyanate is selected from the liquefied MDI, carboxyl is removed by using carbodiimide groups contained in the carbodiimide modified isocyanate, the content of the carboxyl on the surface of the bio-based polyurethane coating is reduced, and the possibility of water invading the bio-based polyurethane coating is further reduced
Detailed Description
Unless otherwise specified, the sources of the raw materials in the following examples and comparative examples are shown in table 1 below:
TABLE 1 sources of raw materials
Examples
The bio-based polyurethane coating is prepared by the following steps:
preparation of component A: weighing tannic acid, 1# epoxidized soybean oil and ethyl acetate according to the formula described in Table 2, adding tannic acid, 1# epoxidized soybean oil and ethyl acetate into a stirrer, stirring at 400rpm for 30min at 50 deg.C under 10 deg.C-3Carrying out vacuum defoaming under the condition of Pa, preserving heat and defoaming for 2 hours to ensure that the water content is less than or equal to 0.01 percent to obtain a component A, and sealing the component A and storing the component A in a dark place;
preparation of the component B: weighing polymethylene polyphenyl isocyanate (with the brand number of PM200), triphenyl phosphorus, halogen-free phosphate flame retardant LA-Q7 and organic silicon defoamer B-313 according to the formula in the following table 2, stirring at the rotating speed of 400rpm for 30min, drying at 50 ℃ and under the pressure of-0.9 MPa for 2h to ensure that the water content of the component B is less than or equal to 0.01 percent to obtain a component B, and sealing and storing the component B in a dark place;
when the bio-based polyurethane coating is used, 50g of the component A and 50g of the component B are taken, and the component A and the component B are stirred for 5min at the rotating speed of 400rpm to obtain the bio-based polyurethane coating. The bio-based polyurethane coating is 1g/cm2The coating amount of the coating is coated on the surface of a base material (the base material is an oak board), the base material is put into an oven after the coating of the base material is finished, the temperature is raised to 50 ℃, the heat preservation reaction is carried out for 3 hours, and then the base material is taken out.
Examples 1 to 12
Examples 1-12 were prepared according to the procedure described above, with the exception that examples 1-12 were: the compositions of the component A and the component B in each example are different, and the specific compositions are shown in the following table 2:
TABLE 2 compositions of A Components and B Components in examples 1-12
Example 13
A bio-based polyurethane coating, which differs from example 10 in that: a mass of carbodiimide-modified isocyanate having a Coronate designation or the like was used in place of the polymethylene polyphenyl isocyanate having a designation of PM 200.
Example 14
A bio-based polyurethane coating, which differs from example 10 in that: a carbodiimide-modified isocyanate having the designation Millionate MTL was used in place of the polymethylene polyphenyl isocyanate having the designation PM200 by mass.
Examples 15 to 16
A bio-based polyurethane coating, which differs from example 10 in that: when the bio-based polyurethane coating is used, the weight ratio of the component A to the component B is different, and the curing reaction temperature and the reaction time are different, wherein 50g of the component A and 55g of the component B are taken in example 15, the temperature is raised to 55 ℃, the substrate is taken out after the heat preservation reaction is carried out for 2 hours; in example 16, 50g of the component A and 60g of the component B were taken out, the temperature was raised to 60 ℃ and the reaction was carried out for 1 hour while maintaining the temperature, and then the substrate was taken out.
Comparative example
Comparative example 1
A bio-based polyurethane coating, which differs from example 1 in that: the epoxidized soybean oil is replaced by tannin and the like.
Comparative example 2
A bio-based polyurethane coating is prepared according to the following steps:
preparation of soybean oil polyol: weighing 150g of isopropanol, 90g of water and 1 wt% of catalyst fluoroboric acid, uniformly stirring the isopropanol, the water and the fluoroboric acid, heating to 82 ℃, adding 50g of epoxidized soybean oil, and reacting at 82 ℃ for 30min to obtain a mixed solution. Removing the catalyst, and vacuumizing the mixed solution at 50 ℃ and-0.9 MPa to obtain the soybean oil polyol. The hydroxyl value was measured according to GB/T12008.3-89 and found to be 250 mgKOH/g.
Preparation of component A: weighing 10g tannic acid, 50g soybean oil polyalcohol and 20g ethyl acetate, adding into a stirrer, stirring at 400rpm for 30min at 50 deg.C and 10 deg.C under pressure-3Condition of PaPerforming vacuum defoaming, preserving heat and defoaming for 2 hours to ensure that the water content is less than or equal to 0.01 percent to obtain a component A, and sealing the component A and storing the component A in a dark place;
preparation of the component B: weighing 40g of polymethylene polyphenyl isocyanate (with the brand number of PM200), 1g of triphenylphosphine, 2g of halogen-free phosphate flame retardant LA-Q7 and 2g of organic silicon defoamer B-313, putting into a stirrer, stirring at the rotating speed of 400rpm for 30min, drying at the temperature of 50 ℃ and the pressure of-0.9 MPa for 2h to ensure that the water content of the mixture is less than or equal to 0.01 percent to obtain a component B, and sealing the component B and storing in a dark place;
when the bio-based polyurethane coating is used, 50g of the component A and 50g of the component B are taken, and the component A and the component B are stirred for 5min at the rotating speed of 400rpm to obtain the bio-based polyurethane coating. The bio-based polyurethane coating is 1g/cm2The coating amount of the coating is coated on the surface of the base material, the base material is put into an oven after being coated, the temperature is raised to 50 ℃, the heat preservation reaction is carried out for 3 hours, and then the base material is taken out.
Performance test
The substrates were coated according to the preparation methods of examples 1 to 16 and comparative examples 1 to 2, and samples of the substrates, having a size of 10cm × 10cm × 10cm, were obtained after curing the biobased polyurethane. The substrate samples were tested as follows.
Detection method
Firstly, detecting hydrolysis resistance and solvent resistance:
the substrate samples were placed in the following environment and the time to crack of the polyurethane coating on the surface of the substrate samples was recorded.
Environment one: at 25 +/-5 ℃, the seawater is continuously and uniformly sprayed on the substrate sample at the atomizing amount of 10 g/min;
and (2) environment II: at 50 +/-5 ℃, the seawater is continuously and uniformly sprayed on the substrate sample at the atomizing amount of 10 g/min;
and (3) environment three: glacial acetic acid with the concentration of 1 wt% is continuously and evenly sprayed on a substrate sample at the atomizing amount of 10g/min at the temperature of 25 +/-5 ℃;
and (4) environment IV: glacial acetic acid with the concentration of 1 wt% is continuously and evenly sprayed on a substrate sample at the atomizing amount of 10g/min at the temperature of 50 +/-5 ℃.
Secondly, detecting physical properties: the tested ambient temperature was 23 + -2 deg.C and ambient humidity was 50 + -5% RH, with the test items as shown in the following table:
| item | Detection standard | Unit of |
| Adhesion force | GB/T 1720-1979 | Stage |
| Flame retardant rating | UL94 | / |
The result of the detection
TABLE 3 hydrolysis resistance and solvent resistance test results
TABLE 4 results of physical Properties
Data analysis this application uses sea water atomizing simulation coastal area environment, and glacial acetic acid atomizing simulates the erosion of acid rain in nature, through the time of the fracture appearance of recording its substrate sample surface biobased polyurethane coating, judges its solvent resistance ability, and the longer time that appears when the fracture proves that its biobased polyurethane coating's solvent resistance ability is better. Meanwhile, the heat resistance of the bio-based polyurethane coating is detected through different atomization temperatures, and the longer the cracking time is, the better the heat resistance of the bio-based polyurethane coating is proved.
Combining example 1 and comparative examples 1-2, and combining the detection results in table 3, it can be seen that, in example 1, the tannic acid, the epoxidized soybean oil and the liquefied MDI are used for crosslinking and curing together, and the cracking time of the bio-based polyurethane coating is significantly longer than that of comparative example 1 and comparative example 2 under the erosion of different solvents with different temperatures, which proves that the crosslinking and curing together of the tannic acid, the epoxidized soybean oil and the liquefied MDI can significantly increase the crosslinking density of the bio-based polyurethane coating during curing, so that the intermolecular gap of polyurethane is reduced, and the permeation of water molecules and solvents is hindered; meanwhile, the heat resistance of the bio-based polyurethane coating is improved.
Combining example 1 and comparative examples 1-2, and combining the test results in table 4, it can be seen that the adhesion of example 1 is grade 1, which is better than the adhesion of comparative examples 1 and 2, and it is proved that the use of tannin polyol can effectively improve the adhesion of bio-based polyurethane coating, and has better adhesive property with substrate.
As can be seen by combining the test results of examples 1-10 and tables 3-4, the comprehensive performance of the bio-based polyurethane coating is superior when the weight ratio of tannic acid, epoxidized soybean oil, ethyl acetate, liquefied MDI and triphenyl phosphine is 0.3:1:0.6:1:0.02, by controlling the weight of tannic acid, epoxidized soybean oil, ethyl acetate, liquefied MDI and triphenyl phosphine.
Combining the test results of examples 10, 13-14 and tables 3-4, it can be seen that when the carbodiimide modified isocyanate is selected as the liquefied MDI, the cracking time of the bio-based polyurethane coating after curing can be effectively prolonged, and the service performance of the bio-based polyurethane coating can be further improved.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. The bio-based polyurethane coating comprises a component A and a component B, wherein the component A and the component B are blended according to the weight ratio of (1-1.2) to 1, and the bio-based polyurethane coating is characterized in that:
the component A is prepared from the following raw materials in parts by weight: 10-20 parts of tannic acid, 50-60 parts of epoxidized soybean oil and 20-40 parts of solvent;
the component B is prepared from the following raw materials in parts by weight: 40-50 parts of liquefied MDI and 1-2 parts of triphenyl phosphine.
2. The bio-based polyurethane coating according to claim 1, wherein: the weight ratio of the tannic acid to the epoxidized soybean oil to the liquefied MDI is (0.2-0.3) to 1 (1-1.1).
3. The bio-based polyurethane coating according to claim 2, wherein: the weight ratio of the epoxidized soybean oil to the triphenyl phosphine is 40: 1.
4. The bio-based polyurethane coating according to claim 3, wherein: the weight ratio of the tannic acid to the solvent is 1: 2.
5. The bio-based polyurethane coating according to claim 1, wherein: the liquefied MDI is carbodiimide modified isocyanate.
6. The bio-based polyurethane coating according to claim 5, wherein: the content of the isocyanate group in the carbodiimide-modified isocyanate is 28-30 wt%.
7. The bio-based polyurethane coating according to claim 1, wherein: the component B also comprises a flame retardant, wherein the weight part of the flame retardant is 2-3, and the flame retardant is halogen-free phosphate.
8. The bio-based polyurethane coating according to claim 1, wherein: the component B also comprises an antifoaming agent, and the weight part of the antifoaming agent is 2-3.
9. A method of preparing a bio-based polyurethane coating according to any one of claims 1 to 8, wherein: the method comprises the following steps:
preparation of component A: weighing tannic acid, epoxidized soybean oil and a solvent according to a formula ratio, stirring and blending, and removing water and bubbles under a vacuum condition to obtain a component A;
preparation of the component B: weighing liquefied MDI, triphenyl phosphine, a flame retardant and a defoaming agent according to the formula ratio, stirring and blending, and removing water and defoaming under a vacuum condition to obtain a component B;
when the bio-based polyurethane coating is used, the component A and the component B are stirred and blended according to the weight ratio of 1 (1-1.2) to obtain the bio-based polyurethane coating, the bio-based polyurethane coating is coated and then heated to 50-60 ℃, and after a heat preservation reaction for 1.5-3 hours, the bio-based polyurethane coating is solidified to form a film.
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| CN115322648A (en) * | 2022-07-26 | 2022-11-11 | 华南农业大学 | Modified graphene-doped bio-based epoxy-phenol system resin anticorrosive paint and preparation method thereof |
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| CN115322648A (en) * | 2022-07-26 | 2022-11-11 | 华南农业大学 | Modified graphene-doped bio-based epoxy-phenol system resin anticorrosive paint and preparation method thereof |
| CN115322648B (en) * | 2022-07-26 | 2023-10-20 | 华南农业大学 | Modified graphene doped bio-based epoxy-phenol system resin anticorrosive paint and preparation method thereof |
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