CN104327716A - Synthetic method of double-component aqueous polyurethane coating - Google Patents
Synthetic method of double-component aqueous polyurethane coating Download PDFInfo
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- CN104327716A CN104327716A CN201410579497.7A CN201410579497A CN104327716A CN 104327716 A CN104327716 A CN 104327716A CN 201410579497 A CN201410579497 A CN 201410579497A CN 104327716 A CN104327716 A CN 104327716A
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- polyurethane coating
- waterborne
- synthetic method
- component polyurethane
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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
- C08G18/0804—Manufacture of polymers containing ionic or ionogenic groups
- C08G18/0819—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups
- C08G18/0823—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups containing carboxylate salt groups or groups forming them
-
- 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
-
- 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
- C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
- C08G18/348—Hydroxycarboxylic acids
-
- 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
- C08G18/6633—Compounds of group C08G18/42
- C08G18/6659—Compounds of group C08G18/42 with compounds of group C08G18/34
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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
- C09D175/06—Polyurethanes from polyesters
Abstract
The invention relates to a synthetic method of a double-component aqueous polyurethane coating. The synthetic method comprises the following steps: adding polyester polyol, TDI, dimethylolpropionic acid and a little amount of N-methylpyrrolidinone into a four-opening flask with a thermometer stirrer and a reflux condenser under the protection of dry nitrogen gas and reacting; adding trimethylolpropane and diethylene glycol for chain extension reaction after reaction to obtain a hydroxyl-containing polyurethane prepolymer; cooling to be at room temperature, adding triethylamine for neutralization, emulsifying in water, adjusting the pH value, and removing acetone under a vacuum condition to obtain polyurethane; and mixing a curing agent and polyurethane dispersoid, adding an appropriate amount of defoaming agent, leveling agent and cosolvent, and dispersing uniformly to obtain the double-component aqueous polyurethane coating. The method is simple, low in cost and can be controlled easily, and the synthesized double-component aqueous polyurethane coating has good physical and mechanical properties, good chemical resistance and good compatibility with the curing agent.
Description
Technical field
The present invention relates to a kind of synthetic technology of organic coating, particularly relate to a kind of waterborne two-component polyurethane coating synthetic method.
Background technology
The high-performance such as bicomponent polyurethane coating has that film-forming temperature is low, strong adhesion, wear resistance are good, hardness is large and chemicals-resistant, weather resisteant be good.Thus industrial protection, wood furniture and car paint is widely used as.Along with the sound of various countries' environmental regulation and the enhancing of environmental consciousness, the quantity discharged of the volatile organic compounds (VOC) in traditional solvent-borne polyurethane coating is more and more subject to strict restriction.Water-borne coatings is dispersion medium with water, have do not fire, nontoxic, free from environmental pollution and save the advantage such as the energy.The high-performance of two part solvent type polyurethane coating and the low VOC content of water-borne coatings combine by aqueous polyurethane coating with bi component, become the study hotspot of coatings industry.
Aqueous polyurethane coating with bi component is by the low viscosity polyisocyanate curing agent (first component) containing NCO base and form containing the water-based polyvalent alcohol (second component) of OH base, and its film performance determines primarily of the Nomenclature Composition and Structure of Complexes of second component hydroxy resin.The second component of aqueous polyurethane coating with bi component different from solvent-type double-component polyurethane coating must have good dispersing property, first component well can be dispersed in water with low shearing energy consumption of trying one's best.Usual second component adopts ACRYLIC EMULSION polyvalent alcohol (particle diameter is between 0.08-0.5 micron), its main drawback is poor to the dispersive ability of solidifying agent, the construction time limit is short, appearance of film is poor: adopt acrylic acid dispersion polyvalent alcohol (particle diameter is less than 0.08 micron), the shortcoming such as have that viscosity is high, solids content is low and dried coating film speed is slower.
Summary of the invention
It is simple that technical problem to be solved by this invention is to provide a kind of method, and cost is low, easy to control, and the waterborne two-component polyurethane coating of synthesis has good physical and mechanical properties, chemical resistance, and the synthetic method good with solidifying agent consistency.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of waterborne two-component polyurethane coating synthetic method, comprises the steps:
Under drying nitrogen protection, polyester polyol, TDI, dimethylol propionic acid and a small amount of N methyl-2-pyrrolidone are joined in the four-hole boiling flask that thermometer agitator and reflux exchanger are housed and reacts;
Add TriMethylolPropane(TMP) after reaction and glycol ether carries out chain extending reaction, obtain the base polyurethane prepolymer for use as of hydroxyl;
Add triethylamine neutralization after being cooled to room temperature, emulsification adjust ph in water, vacuum is sloughed acetone and is obtained urethane;
Solidifying agent and polyurethane dispersions mixing are added proper quantity of defoaming agent, flow agent and cosolvent be uniformly dispersed, obtain waterborne two-component polyurethane coating.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described under drying nitrogen protection, polyester polyol, TDI, dimethylol propionic acid and a small amount of N methyl-2-pyrrolidone are joined being implemented as follows of reactions steps in the four-hole boiling flask that thermometer agitator and reflux exchanger are housed:
Under drying nitrogen protection, by the polyester polyol of 10 ~ 13%, the TDI of 17 ~ 22%, the dimethylol propionic acid of 23 ~ 28% and 2 ~ 6% N methyl-2-pyrrolidone join in the 1000ml four-hole boiling flask that thermometer agitator and reflux exchanger are housed and react.
Further, add TriMethylolPropane(TMP) after described reaction and glycol ether carries out chain extending reaction, obtain being implemented as follows of the base polyurethane prepolymer for use as step of hydroxyl:
React after 1 ~ 2h under 80 ~ 85 DEG C of conditions, add TriMethylolPropane(TMP) and glycol ether carries out chain extending reaction 0.5 ~ 1h, obtain the base polyurethane prepolymer for use as of hydroxyl.
Further, described in be cooled to room temperature after add triethylamine neutralization, emulsification adjust ph in water, vacuum is sloughed acetone and is obtained being implemented as follows of urethane step:
Add triethylamine neutralization after being cooled to room temperature, in water, emulsification adjust ph is 6 ~ 8, and vacuum sloughs acetone, obtains urethane.
Further, described by solidifying agent and polyurethane dispersions mixing add proper quantity of defoaming agent, flow agent and cosolvent be uniformly dispersed, obtain being implemented as follows of waterborne two-component polyurethane coating step:
According to NCO:OH=1:1, by solidifying agent and polyurethane dispersions mixing, add the defoamer of 2 ~ 2.8%, the flow agent of 1 ~ 2.3% and 1 ~ 1.4% cosolvent be uniformly dispersed, obtain waterborne two-component polyurethane coating.
The invention has the beneficial effects as follows: method is simple, and cost is low, easy to control, and the waterborne two-component polyurethane coating of synthesis has good physical and mechanical properties, chemical resistance, and good with solidifying agent consistency.
Embodiment
Be described principle of the present invention and feature below in conjunction with example, example, only for explaining the present invention, is not intended to limit scope of the present invention.
A kind of waterborne two-component polyurethane coating synthetic method, comprises the steps:
Under drying nitrogen protection, polyester polyol, TDI, dimethylol propionic acid and a small amount of N methyl-2-pyrrolidone are joined in the four-hole boiling flask that thermometer agitator and reflux exchanger are housed and reacts;
Add TriMethylolPropane(TMP) after reaction and glycol ether carries out chain extending reaction, obtain the base polyurethane prepolymer for use as of hydroxyl;
Add triethylamine neutralization after being cooled to room temperature, emulsification adjust ph in water, vacuum is sloughed acetone and is obtained urethane;
Solidifying agent and polyurethane dispersions mixing are added proper quantity of defoaming agent, flow agent and cosolvent be uniformly dispersed, obtain waterborne two-component polyurethane coating.
Embodiment 1:
Under drying nitrogen protection, by the polyester polyol of 10%, the TDI of 17%, the dimethylol propionic acid of 23% and 2% N methyl-2-pyrrolidone join in the 1000ml four-hole boiling flask that thermometer agitator and reflux exchanger are housed and react; React 1h under 80 DEG C of conditions after, add TriMethylolPropane(TMP) and glycol ether carries out chain extending reaction 0.5h, obtain the base polyurethane prepolymer for use as of hydroxyl; Add triethylamine neutralization after being cooled to room temperature, in water, emulsification adjust ph is 6, and vacuum sloughs acetone, obtains urethane; According to NCO:OH=1:1, by solidifying agent and polyurethane dispersions mixing, add the defoamer of 2%, the flow agent of 1% and 1% cosolvent be uniformly dispersed, obtain waterborne two-component polyurethane coating.
Embodiment 2:
Under drying nitrogen protection, by the polyester polyol of 12%, the TDI of 18%, the dimethylol propionic acid of 25% and 5% N methyl-2-pyrrolidone join in the 1000ml four-hole boiling flask that thermometer agitator and reflux exchanger are housed and react; React 1.5h under 82 DEG C of conditions after, add TriMethylolPropane(TMP) and glycol ether carries out chain extending reaction 0.8h, obtain the base polyurethane prepolymer for use as of hydroxyl; Add triethylamine neutralization after being cooled to room temperature, in water, emulsification adjust ph is 7, and vacuum sloughs acetone, obtains urethane; According to NCO:OH=1:1, by solidifying agent and polyurethane dispersions mixing, add the defoamer of 2.5%, the flow agent of 2% and 1.2% cosolvent be uniformly dispersed, obtain waterborne two-component polyurethane coating.
Embodiment 3:
Under drying nitrogen protection, by the polyester polyol of 13%, the TDI of 22%, the dimethylol propionic acid of 28% and 6% N methyl-2-pyrrolidone join in the 1000ml four-hole boiling flask that thermometer agitator and reflux exchanger are housed and react; React 2h under 85 DEG C of conditions after, add TriMethylolPropane(TMP) and glycol ether carries out chain extending reaction 1h, obtain the base polyurethane prepolymer for use as of hydroxyl; Add triethylamine neutralization after being cooled to room temperature, in water, emulsification adjust ph is 8, and vacuum sloughs acetone, obtains urethane; According to NCO:OH=1:1, by solidifying agent and polyurethane dispersions mixing, add the defoamer of 2.8%, the flow agent of 2.3% and 1.4% cosolvent be uniformly dispersed, obtain waterborne two-component polyurethane coating.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a waterborne two-component polyurethane coating synthetic method, is characterized in that, comprises the steps:
Under drying nitrogen protection, polyester polyol, TDI, dimethylol propionic acid and a small amount of N methyl-2-pyrrolidone are joined in the four-hole boiling flask that thermometer agitator and reflux exchanger are housed and reacts;
Add TriMethylolPropane(TMP) after reaction and glycol ether carries out chain extending reaction, obtain the base polyurethane prepolymer for use as of hydroxyl;
Add triethylamine neutralization after being cooled to room temperature, emulsification adjust ph in water, vacuum is sloughed acetone and is obtained urethane;
Solidifying agent and polyurethane dispersions mixing are added proper quantity of defoaming agent, flow agent and cosolvent be uniformly dispersed, obtain waterborne two-component polyurethane coating.
2. a kind of waterborne two-component polyurethane coating synthetic method according to claim 1; it is characterized in that; described under drying nitrogen protection, polyester polyol, TDI, dimethylol propionic acid and a small amount of N methyl-2-pyrrolidone are joined being implemented as follows of reactions steps in the four-hole boiling flask that thermometer agitator and reflux exchanger are housed:
Under drying nitrogen protection, by the polyester polyol of 10 ~ 13%, the TDI of 17 ~ 22%, the dimethylol propionic acid of 23 ~ 28% and 2 ~ 6% N methyl-2-pyrrolidone join in the 1000ml four-hole boiling flask that thermometer agitator and reflux exchanger are housed and react.
3. a kind of waterborne two-component polyurethane coating synthetic method according to claim 1, is characterized in that, adds TriMethylolPropane(TMP) and glycol ether carries out chain extending reaction after described reaction, obtains being implemented as follows of the base polyurethane prepolymer for use as step of hydroxyl:
React after 1 ~ 2h under 80 ~ 85 DEG C of conditions, add TriMethylolPropane(TMP) and glycol ether carries out chain extending reaction 0.5 ~ 1h, obtain the base polyurethane prepolymer for use as of hydroxyl.
4. a kind of waterborne two-component polyurethane coating synthetic method according to claim 1, is characterized in that, described in be cooled to room temperature after add triethylamine neutralization, emulsification adjust ph in water, vacuum is sloughed acetone and is obtained being implemented as follows of urethane step:
Add triethylamine neutralization after being cooled to room temperature, in water, emulsification adjust ph is 6 ~ 8, and vacuum sloughs acetone, obtains urethane.
5. a kind of waterborne two-component polyurethane coating synthetic method according to claim 1, it is characterized in that, described by solidifying agent and polyurethane dispersions mixing add proper quantity of defoaming agent, flow agent and cosolvent be uniformly dispersed, obtain being implemented as follows of waterborne two-component polyurethane coating step:
According to NCO:OH=1:1, by solidifying agent and polyurethane dispersions mixing, add the defoamer of 2 ~ 2.8%, the flow agent of 1 ~ 2.3% and 1 ~ 1.4% cosolvent be uniformly dispersed, obtain waterborne two-component polyurethane coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410579497.7A CN104327716A (en) | 2014-10-26 | 2014-10-26 | Synthetic method of double-component aqueous polyurethane coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410579497.7A CN104327716A (en) | 2014-10-26 | 2014-10-26 | Synthetic method of double-component aqueous polyurethane coating |
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| CN104327716A true CN104327716A (en) | 2015-02-04 |
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| CN201410579497.7A Pending CN104327716A (en) | 2014-10-26 | 2014-10-26 | Synthetic method of double-component aqueous polyurethane coating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105238248A (en) * | 2015-10-22 | 2016-01-13 | 东莞市梅居印刷材料有限公司 | Double-composition cured resin used for film covering of paper products and paper-product film covering method |
| CN112708097A (en) * | 2020-12-24 | 2021-04-27 | 华南理工大学 | High-solid-content low-viscosity odorless hydroxyl polyurethane resin and preparation method and application thereof |
-
2014
- 2014-10-26 CN CN201410579497.7A patent/CN104327716A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105238248A (en) * | 2015-10-22 | 2016-01-13 | 东莞市梅居印刷材料有限公司 | Double-composition cured resin used for film covering of paper products and paper-product film covering method |
| CN112708097A (en) * | 2020-12-24 | 2021-04-27 | 华南理工大学 | High-solid-content low-viscosity odorless hydroxyl polyurethane resin and preparation method and application thereof |
| CN112708097B (en) * | 2020-12-24 | 2022-03-15 | 华南理工大学 | High-solid-content low-viscosity odorless hydroxyl polyurethane resin and preparation method and application thereof |
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Application publication date: 20150204 |
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| WD01 | Invention patent application deemed withdrawn after publication |