CN114805744A - Waterborne polyurethane modified epoxy resin and preparation method and application thereof - Google Patents
Waterborne polyurethane modified epoxy resin and preparation method and application thereof Download PDFInfo
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- CN114805744A CN114805744A CN202210425911.3A CN202210425911A CN114805744A CN 114805744 A CN114805744 A CN 114805744A CN 202210425911 A CN202210425911 A CN 202210425911A CN 114805744 A CN114805744 A CN 114805744A
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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
- C08G18/7614—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring
- C08G18/7621—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring being toluene diisocyanate including isomer mixtures
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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
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
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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
- C08G18/2805—Compounds having only one group containing active hydrogen
- C08G18/2815—Monohydroxy compounds
- C08G18/2845—Monohydroxy epoxy compounds
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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
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
- C08G18/4018—Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
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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
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
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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
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4825—Polyethers containing two hydroxy 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
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/6692—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/34
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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
- C08G18/73—Polyisocyanates or polyisothiocyanates acyclic
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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
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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
- C09D175/08—Polyurethanes from polyethers
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
Abstract
The invention belongs to the technical field of high polymer materials, and particularly discloses a waterborne polyurethane modified epoxy resin and a preparation method and application thereof. The preparation raw materials of the waterborne polyurethane modified epoxy resin comprise: isocyanate monomer, polyol, hydrophilic modifier and glycidol. The invention introduces epoxy group through glycidol, adopts glycidol as monomer to synthesize polyurethane modified epoxy resin, when preparing, firstly adopts isocyanate monomer, and prepares isocyanate prepolymer containing-NCO after reacting with polyatomic alcohol; then introducing a hydrophilic modifier, and then reacting glycidol with the residual-NCO, compared with the traditional preparation method, the epoxy resin has high epoxy equivalent weight, the paint film is endowed with excellent flexibility, elongation at break and impact resistance after being cured, the corrosion resistance is equivalent to that of the epoxy resin, the flexibility is as low as 1mm, and the adhesive force level is 1 level; the elongation at break reaches 88-125%, and the impact resistance is more than 50 cm.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to waterborne polyurethane modified epoxy resin and a preparation method and application thereof.
Background
The epoxy resin has the advantages of excellent chemical resistance, strong adhesive force to various base materials, low cost and the like, and is widely applied to the fields of adhesives, coatings and the like. However, the epoxy resin also has the defects of large internal stress, brittle coating, poor impact resistance, easy cracking, poor humidity resistance and the like caused by high crosslinking density after crosslinking and curing, so that the application field and the application scene of the epoxy resin are limited.
The polyurethane has good physical and chemical properties, and the excellent flexibility endows the coating with the advantages of good cold resistance, tensile strength, high gloss and fullness, organic solvent resistance and the like. Thus, the epoxy resin may be modified with polyurethane to improve the toughness of the epoxy resin. Meanwhile, with higher environmental protection and low carbon requirements, the polyurethane modified epoxy resin needs to be hydrated on the premise of not sacrificing resin performance.
The traditional polyurethane modified epoxy resin water-based modification is to perform hydrophilic modification on a polyurethane prepolymer, and then to perform reaction on epoxy resin containing-OH groups and isocyanate containing-NCO groups so as to improve the hydrophilic performance of the waterborne polyurethane modified epoxy resin. However, epoxy resins tend to have a low hydroxyl content and provide fewer crosslinking points, and the degree of modification is greatly limited, resulting in films prepared therefrom which have poor flexibility, elongation at break and impact resistance.
Therefore, it is desirable to provide an aqueous polyurethane-modified epoxy resin which, when formulated into a paint film, has excellent flexibility, elongation at break and impact resistance.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the invention provides the waterborne polyurethane modified epoxy resin which has good flexibility, and the waterborne polyester resin is prepared into a paint film (namely a paint film prepared by mixing the waterborne polyurethane modified epoxy resin and a waterborne epoxy curing agent), so that the waterborne polyurethane modified epoxy resin has good flexibility, elongation at break and impact resistance, and the chemical corrosion resistance is equivalent to that of epoxy resin.
The first aspect of the invention provides a waterborne polyurethane modified epoxy resin.
Specifically, the waterborne polyurethane modified epoxy resin is prepared from the following raw materials: isocyanate monomer, polyol, hydrophilic modifier and glycidol.
Preferably, the polyol is at least one selected from small molecule polyol, polyether polyol and polyester polyol.
Preferably, the small molecule polyol comprises a diol and/or a triol.
Further preferably, the small molecule polyol is at least one selected from the group consisting of ethylene glycol, 1, 2-propanediol, 1, 3-propanediol, 2-methyl-1, 3-propanediol, 1, 5-pentanediol, 1, 6-hexanediol, 1, 7-heptanediol, 3, 5-heptanediol, 1, 8-octanediol, Trimethylolpropane (TMP), trimethylolethane, glycerol, and pentaerythritol. The small molecular weight polyols may be used alone or in combination of two or more.
Preferably, the polyether polyol is an adduct of ethylene oxide, propylene oxide and ethylene oxide/propylene oxide obtained by ring opening of the small molecular weight polyol as an initiator, the molecular weight is 2000, and the functionality is 2.
Preferably, the polyester polyol is a hydroxyl group-containing compound obtained by esterification of the small-molecular polyol with a polycarboxylic acid or an ester, anhydride, halide or the like thereof, and has a molecular weight of 2000 and a functionality of 2.
Preferably, the mass ratio of the small molecular polyol to the polyether polyol to the polyester polyol is (4-12): (5-8): (5-8).
Preferably, the hydrophilic modifier is selected from dimethylolpropionic acid and/or dimethylolbutyric acid.
Preferably, the isocyanate monomer is selected from at least one of Toluene Diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), Hexamethylene Diisocyanate (HDI), Lysine Diisocyanate (LDI).
Preferably, the preparation raw material further comprises at least one of a neutralizing agent, deionized water and a hydrophilic solvent.
Preferably, the hydrophilic solvent is selected from acetone and/or butanone.
Preferably, the neutralizing agent is selected from tertiary amine substances, and the tertiary amine substances are selected from at least one of trimethylamine, triethylamine, N-dimethylethanolamine, N-dimethylpropanolamine, N-dipropylethanolamine and triethanolamine; the tertiary amine substance can form a hydrophilic salt with the hydrophilic modifier.
Preferably, the preparation raw materials comprise the following components in parts by weight:
the second aspect of the invention provides a preparation method of the waterborne polyurethane modified epoxy resin.
Specifically, the preparation method of the waterborne polyurethane modified epoxy resin comprises the following steps:
(1) heating and stirring isocyanate monomer for the first time, then adding polyol in batches, heating for the second time, reacting to obtain isocyanate prepolymer, and cooling;
(2) adding a hydrophilic modifier into the isocyanate prepolymer prepared in the step (1), heating for the third time, carrying out hydrophilic modification, and adding a neutralizer after cooling to obtain a neutralized product;
(3) and (3) adding glycidol into the neutralization product prepared in the step (2), heating for the fourth time to react, adding deionized water to disperse water, and performing vacuum desolventizing to obtain the waterborne polyurethane modified epoxy resin.
Preferably, in the step (1), the temperature is raised to 55-65 ℃ for the first time, is raised to 75-85 ℃ for the second time, the reaction time is 2-5 hours, and the temperature is lowered to 55-65 ℃.
Preferably, in the step (2), the temperature is raised to 75-85 ℃ for the third time, the heat preservation time is 2-4 hours, and the temperature is lowered to 65-75 ℃; in the step (3), the temperature is raised to 75-85 ℃ for the fourth time, and the heat preservation time is 2-4 hours.
The third aspect of the invention provides an application of the waterborne polyurethane modified epoxy resin.
Specifically, the paint comprises the waterborne polyurethane modified epoxy resin.
Preferably, the paint comprises a component A and a component B, wherein the component A comprises the waterborne polyurethane modified epoxy resin, a pigment, a filler, a leveling agent, a defoaming agent and a dispersing agent; the component B is a waterborne epoxy curing agent.
In a fourth aspect of the invention, there is provided a use of a lacquer according to the invention.
Specifically, the coating is prepared from the paint disclosed by the invention.
Compared with the prior art, the technical scheme of the invention at least has the following technical effects or advantages:
according to the invention, the epoxy group is introduced by the glycidol, the glycidol is used as a monomer to synthesize the polyurethane modified epoxy resin, compared with the traditional polyurethane epoxy resin synthesized by the epoxy resin, the prepared epoxy resin has high epoxy equivalent, the paint film can be endowed with excellent flexibility, elongation at break and impact resistance after being cured, and the chemical corrosion resistance is equivalent to that of the epoxy resin.
When the waterborne polyurethane modified epoxy resin is prepared, firstly, isocyanate monomer is adopted and reacts with polyol to prepare isocyanate prepolymer containing-NCO; then introducing a hydrophilic modifier, and reacting glycidol with the residual-NCO; after the reaction is finished, dispersing and desolventizing the water to prepare the waterborne polyurethane modified epoxy resin, wherein the epoxy equivalent is adjustable, and the crosslinking degree is controllable.
After the waterborne polyurethane modified epoxy resin is prepared into a paint film, the flexibility is as low as 1mm, and the adhesive force grade is 1 grade; the elongation at break reaches 88-125%, and the impact resistance is more than 50 cm.
Detailed Description
The present invention is described in detail below by way of examples to facilitate understanding of the present invention by those skilled in the art, and it is to be specifically noted that the examples are provided only for the purpose of further illustrating the present invention and are not to be construed as limiting the scope of the present invention.
Example 1
The waterborne polyurethane modified epoxy resin is prepared by reacting the following raw materials:
a preparation method of waterborne polyurethane modified epoxy resin comprises the following steps:
(1) adding isocyanate monomer TDI into hydrophilic solvent acetone, heating to 55 ℃ for the first time, stirring, then adding (the same amount of each addition) polyol (TMP, 1, 4-butanediol and polyether polyol) for three times, heating to 75 ℃ for the second time, reacting to obtain isocyanate prepolymer, and cooling to 55 ℃;
(2) adding a hydrophilic modifier dimethylolpropionic acid into the isocyanate prepolymer prepared in the step (1), heating to 75 ℃ for the third time, preserving the heat for 4 hours, carrying out hydrophilic modification, cooling to 65 ℃, and adding a neutralizing agent triethylamine to obtain a neutralized product;
(3) and (3) adding glycidol into the neutralized product prepared in the step (2), heating to 75 ℃ for the fourth time, preserving the temperature for 4 hours, reacting, slowly adding deionized water while the mixture is hot to disperse water, performing vacuum desolventizing after the phase inversion process is finished, recovering the solvent, and refining to obtain the waterborne polyurethane modified epoxy resin.
Example 2
The waterborne polyurethane modified epoxy resin is prepared by reacting the following raw materials:
a preparation method of waterborne polyurethane modified epoxy resin comprises the following steps:
(1) adding isocyanate monomer TDI into hydrophilic solvent acetone, heating to 65 ℃ for the first time, stirring, adding (the adding amount of each time is the same) polyol (TMP, neopentyl glycol, polyether polyol and polyester polyol) for three times, heating to 85 ℃ for the second time, reacting to obtain isocyanate prepolymer, and cooling to 65 ℃;
(2) adding a hydrophilic modifier, namely dimethylolbutyric acid into the isocyanate prepolymer prepared in the step (1), heating to 85 ℃ for the third time, preserving the heat for 2 hours, carrying out hydrophilic modification, cooling to 65 ℃, and adding a neutralizing agent, namely triethylamine, to obtain a neutralized product;
(3) and (3) adding glycidol into the neutralized product prepared in the step (2), heating to 85 ℃ for the fourth time, preserving the temperature for 2 hours, reacting, slowly adding deionized water while the mixture is hot to disperse water, performing vacuum desolventization after the phase inversion process is finished, recovering the solvent, and refining to obtain the waterborne polyurethane modified epoxy resin of the embodiment.
Example 3
The waterborne polyurethane modified epoxy resin is prepared by reacting the following raw materials:
a preparation method of waterborne polyurethane modified epoxy resin comprises the following steps:
(1) heating an isocyanate monomer HDI to 60 ℃ for the first time, stirring, adding (the adding amount of each time is the same) polyol (TMP, 1, 4-butanediol, polyether polyol and polyester polyol) for three times, heating to 80 ℃ for the second time, reacting to obtain an isocyanate prepolymer, and cooling to 60 ℃;
(2) adding a hydrophilic modifier, namely dimethylolbutyric acid into the isocyanate prepolymer prepared in the step (1), heating to 80 ℃ for the third time, preserving the heat for 3 hours, carrying out hydrophilic modification, cooling to 70 ℃, and adding a neutralizing agent, namely triethylamine, to obtain a neutralized product;
(3) and (3) adding glycidol into the neutralized product obtained in the step (2), heating to 80 ℃ for the fourth time, preserving the temperature for 3 hours, reacting, and slowly adding deionized water while the mixture is hot to disperse the water, so as to obtain the waterborne polyurethane modified epoxy resin.
Comparative example 1
And (3) a commercially available waterborne polyurethane modified epoxy resin.
Comparative example 2
Commercially available waterborne epoxy resins.
Product performance testing
Taking the resins of the examples 1-3 and the comparative examples 1-2, preparing a component A according to the weight part in the table 1, stirring, and grinding to the fineness of less than 30 μm for later use; adopting a commercially available waterborne epoxy curing agent as a component B; strictly calculating the component A and the component B according to the epoxy ester, and adding a solvent to the construction viscosity; and curing the paint emulsion after manufacturing the plate for 7 days, and testing the performance of the paint film, wherein the specific performance is shown in Table 2.
Table 1: the raw material composition of component A
| Raw materials | Polyurethane modified epoxy resin | Pigment (I) | Filler material | Leveling agent | Defoaming agent | Dispersing agent |
| Quality (parts) | 55 | 5 | 38 | 0.5 | 0.5 | 1 |
Table 2: comparative table of properties of each example and comparative example
As can be seen from Table 2, the aqueous urethane-modified epoxy resins prepared in examples 1 to 3 of the present invention have excellent flexibility, elongation at break and impact resistance, and the aqueous urethane epoxy resin modified by grafting of the present invention has excellent chemical resistance similar to that of the aqueous epoxy resin of comparative example 2. Comparative example 1 is a commercially available waterborne polyurethane modified epoxy resin with a lower epoxy value and poorer chemical resistance. Comparative example 2 is a commercially available waterborne epoxy resin, which is prepared by an external emulsification method, and has a low film gloss and poor pigment and filler dispersibility. The flexibility, elongation at break and impact resistance were poor.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (10)
1. The waterborne polyurethane modified epoxy resin is characterized by comprising the following preparation raw materials: isocyanate monomer, polyol, hydrophilic modifier and glycidol.
2. The waterborne polyurethane modified epoxy resin of claim 1, wherein the polyol comprises at least one of a small molecule polyol, a polyether polyol, and a polyester polyol.
3. The waterborne polyurethane modified epoxy resin of claim 2, wherein the mass ratio of the small molecule polyol, the polyether polyol and the polyester polyol is (4-12): (5-8): (5-8).
4. The waterborne polyurethane modified epoxy resin of claim 2, wherein the small molecule polyol comprises a diol and/or a triol.
5. The aqueous polyurethane modified epoxy resin according to claim 1, wherein the hydrophilic modifier is selected from dimethylolpropionic acid and/or dimethylolbutyric acid.
6. The waterborne polyurethane modified epoxy resin of claim 1, wherein the raw materials further comprise at least one of a neutralizing agent, a deionized solvent and a hydrophilic solvent; the hydrophilic solvent is selected from acetone and/or butanone; the preparation raw materials comprise the following components in parts by weight:
7. the method for preparing the aqueous polyurethane modified epoxy resin according to any one of claims 1 to 6, comprising the steps of:
(1) heating and stirring isocyanate monomer for the first time, then adding polyol in batches, heating for the second time, reacting to obtain isocyanate prepolymer, and cooling;
(2) adding a hydrophilic modifier into the isocyanate prepolymer prepared in the step (1), heating for the third time, carrying out hydrophilic modification, and adding a neutralizer after cooling to obtain a neutralized product;
(3) and (3) adding glycidol into the neutralization product prepared in the step (2), heating for the fourth time to react, adding deionized water to disperse water, and performing vacuum desolventizing to obtain the waterborne polyurethane modified epoxy resin.
8. The preparation method of the waterborne polyurethane modified epoxy resin as claimed in claim 7, wherein in the step (1), the temperature is raised to 55-65 ℃ for the first time, the temperature is raised to 75-85 ℃ for the second time, the reaction time is 2-5 hours, and the temperature is lowered to 55-65 ℃; in the step (2), the temperature is raised to 75-85 ℃ for the third time, the heat preservation time is 2-4 hours, and the temperature is lowered to 65-75 ℃; in the step (3), the temperature is raised to 75-85 ℃ for the fourth time, and the heat preservation time is 2-4 hours.
9. A paint, characterized in that the paint comprises the aqueous polyurethane-modified epoxy resin according to any one of claims 1 to 6.
10. A coating produced from the lacquer according to claim 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116082647A (en) * | 2023-02-17 | 2023-05-09 | 山东奔腾漆业股份有限公司 | Water-soluble polyester modified epoxy resin and preparation method thereof |
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