CN107099235B - Transparent waterborne polyurethane composition with stable performance in activation period - Google Patents
Transparent waterborne polyurethane composition with stable performance in activation period Download PDFInfo
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- CN107099235B CN107099235B CN201610834329.7A CN201610834329A CN107099235B CN 107099235 B CN107099235 B CN 107099235B CN 201610834329 A CN201610834329 A CN 201610834329A CN 107099235 B CN107099235 B CN 107099235B
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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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses a transparent waterborne polyurethane composition with stable performance in an activation period, which comprises hydroxyl polyacrylate dispersion resin, matt paste, wetting agent, defoaming agent, thickening agent, leveling agent, anti-settling agent, preservative and water according to the parts by weight in the claims and the specification. After the varnish main paint prepared from the components is mixed with a curing agent, paint films prepared in different mixing time have stable performance within a specified working life, and the performance meets the requirements of national standard GB23999-2009 on water-based wood paint.
Description
Technical Field
The invention relates to aqueous two-component woodenware varnish, in particular to a transparent aqueous polyurethane composition with stable performance in an activation period for woodenware.
Background
Since the 21 st century, with the increasing awareness of environmental protection and health, the restrictions of environmental regulations of various countries on VOC tend to be severe, and solvent-based wood coatings are challenged. From the viewpoint of environmental protection, the water-based coating is becoming a hot point of research and development. In China, the annual growth rate of the waterborne wood coating is over 15 percent in 5 years, and the trend of replacing the traditional solvent-based coating by the waterborne wood coating is developed in the future.
The traditional single-component waterborne wood coating has the advantages of health, environmental protection, convenient operation and the like, but generally has the defects of low gloss, low hardness, poor scratch resistance, poor abrasion resistance, unstable chemical resistance and the like. The double-component wood coating forms a compact paint film through external crosslinking of isocyanate bonds and hydroxyl groups or other groups, so that the double-component wood coating has the advantages of relatively high hardness and wear resistance, more outstanding heat resistance, better pollution resistance and chemical resistance and the like.
But no mature water-based double-component polyurethane woodware product is sold in the home decoration market at present; meanwhile, the laboratory tests that the double-component product has the problem that the performance of a paint film is unstable within the using time of the activation period, and constructors cannot construct the stable paint film in different time, so that the using requirements of the product are influenced. Specifically, in the aqueous two-component wood lacquer product in the prior art, after the main lacquer is mixed with the curing agent, a chemical reaction starts in the lacquer liquid, besides a cross-linking reaction of polyisocyanate and a hydroxyl resin dispersion, side reactions such as the curing agent and water also exist, along with the continuous progress of the reaction, the lacquer film after construction can show the condition of reducing the mechanical property and the chemical resistance along with the prolonging of the lacquer preparation time, and the condition that the performance is lower than the requirement of the national standard GB23999-2009 can occur in many cases; meanwhile, the phenomenon can not be judged by a user whether the performance is poor or not through the state of the paint liquid, so that a paint film after construction and coating has different performances and can not meet the requirements when the paint is used by a constructor after different paint preparation time.
Therefore, in order to meet the requirement of stable performance of the aqueous product in the home decoration market, the development of the two-component aqueous polyurethane woodenware varnish with stable performance in the activation period is necessary.
Disclosure of Invention
The invention aims to provide a two-component waterborne polyurethane woodware varnish with stable performance in an activation period and a preparation method thereof.
In a first aspect of the invention, there is provided a polyurethane composition comprising or consisting of:
in another preferred embodiment, the polyurethane composition comprises or consists of:
in another preferred embodiment, the hydroxyl polyacrylate dispersion resin comprises a weight ratio of 0.5 to 1.5: 1 (preferably 0.6-1.4:1, more preferably 0.7-1.35:1 or 0.75-1.33:1) of a hydroxyl polyacrylate dispersantBulk resin
A2846 XP and hydroxyl polyacrylate dispersion resin
A 2845 XP。
In another preferred embodiment, the matt paste comprises 78-82wt% of water, 1-3wt% of propylene glycol, 2-4wt% of dispersing agent, 0.2-0.4wt% of pH regulator, 13-14wt% of matting powder and 0.1-0.3wt% of matting paste defoaming agent, and the sum of the contents of the components is 100wt% based on the total weight of the matt paste.
In another preferred example, the dispersant is an acrylic polymer-based dispersant. In another preferred embodiment, the pH adjusting agent is an organic amine pH adjusting agent, such as AMP-95 (Dow chemical). In another preferred example, the matting powder is fumed silica matting powder. In another preferred embodiment, the matt paste antifoaming agent is selected from TEGO FOAMEX 810.
In another preferred embodiment, the humectant is selected from: polyether group modified siloxane solution ByK 346, ByK345, polyether siloxane Digao TEGO 270, organosilicon wetting agent ADL-704, SILCO WET D-504/PEG, Dow wetting agent CF-10, wetting agent X-405 and fluorine surfactant FS-61; and/or
In another preferred embodiment, the defoaming agent is selected from: one or the combination of more than two of mineral oil type, organic silicon type or polyether type defoaming agents; such as organically modified silicone emulsion (e.g., TEGO FOAMEX 825, TEGO FOAMEX 810), antifoaming agent NX of NOPOKE AID, antifoaming agent AM-1512 of ISHAN group, ByK066, DREWPLUS S-4386.
In another preferred embodiment, the leveling agent is selected from: polyether modified siloxane TEGO GLIDE 450, TEGO 410, TEGO 432, TEgo FLOW425, ByK 310; and/or
In another preferred embodiment, the thickener is selected from the group consisting of: polyurethane type thickeners Rheovis PU 1290, Rohm and Haas RM-2020 and RM-895; and/or
In another preferred embodiment, the anti-settling agent is selected from: silica water solution AERODISP W7520N, Disparlon A-630-20X; and/or
In another preferred embodiment, the preservative is an in-can preservative selected from the group consisting of: BIOX VFB1, Dow chemical BIOBANTM 551S.
In a second aspect of the invention, a varnish main paint is provided, which is prepared from the following components in parts by weight:
in another preferred example, the fineness of the varnish main paint is 20-35 microns.
In another preferred embodiment, the viscosity of the varnish base coat is 45 to 55 KU.
In a third aspect of the present invention, there is provided a method for producing a varnish primer according to the second aspect, characterized in that the method comprises the steps of:
(i) mixing the hydroxyl polyacrylate dispersion resin with a portion of water to obtain a first mixture;
(ii) adding the extinction slurry into the first mixture, and mixing to obtain a second mixture;
(iii) adding the wetting agent, the defoaming agent, the thickening agent, the leveling agent, the anti-settling agent, the preservative and the residual water into the second mixture, mixing to obtain the varnish main paint,
wherein the partial water accounts for 40 to 60 weight percent of the total weight of the water, and the weight parts of other components are as described above.
In another preferred example, the first mixture is obtained by mixing at a medium speed of 600-; and/or
Mixing at a high speed of 1000-1500r/min in the step ii) (mixing for 10-15min) to obtain the second mixture; and/or
And mixing at a medium speed of 600-800r/min (mixing for 15-25min) in the step iii) to obtain the varnish main paint.
In a fourth aspect of the present invention, there is provided a varnish composition comprising the polyurethane composition of the first aspect and a curing agent composition, wherein the curing agent composition comprises:
25-32 parts of propylene glycol diacetate;
0.2 to 0.5 weight portion of dehydrating agent;
60-80 parts by weight of hydrophilic aliphatic polyisocyanate.
In another preferred embodiment, the curing agent composition comprises or consists of:
28-30 parts of propylene glycol diacetate;
0.25 to 0.4 weight portion of dehydrating agent;
65-75 parts by weight of hydrophilic aliphatic polyisocyanate.
In another preferred example, the hydrophilic aliphatic polyisocyanate is a hydrophilic aliphatic polyisocyanate curing agent
In a fifth aspect of the present invention, a varnish is provided, which comprises the varnish main paint of the second aspect and a curing agent, wherein the curing agent is prepared from the following components in parts by weight:
25-32 parts of propylene glycol diacetate;
0.2 to 0.5 weight portion of dehydrating agent;
60-80 parts by weight of hydrophilic aliphatic polyisocyanate.
In another preferred embodiment, the formulation of the curing agent comprises the following steps:
(a) mixing propylene glycol diacetate with the dehydrating agent (preferably at a mixing rate of 600-800 r/min);
(b) when the water content of the mixture obtained in the step a) is less than 0.05%, adding hydrophilic aliphatic polyisocyanate, and mixing (preferably, the mixing speed is 800-.
In another preferred embodiment, the mass ratio of the varnish main paint to the curing agent is 4-6:1, preferably 4.5-5.5:1, and more preferably 5: 1.
In another preferred embodiment, the molar ratio of the-NCO of the hydrophilic aliphatic polyisocyanate to the-OH of the hydroxy polyacrylate dispersion resin is 1-2:1, more preferably 1.2-1.7:1, even 1.32-1.47:1, more preferably 1.35-1.45: 1.
In another preferred embodiment, the preparation method of the varnish comprises the following steps:
(i) uniformly mixing the varnish main paint and the curing agent according to the mass ratio of 4-6: 1;
(ii) adding water to dilute and mix evenly, and standing to obtain the varnish, wherein the mass of the water is 10wt% -30wt%, preferably 15 wt% -25 wt%, and preferably 20 wt% of the mass of the varnish main paint.
The polyurethane composition and the varnish have good practical performance, and after the varnish main paint and the curing agent are mixed, the paint films prepared in different mixing time have stable performance within the specified working life, and the performance meets the requirements of national standard GB23999-2009 on water-based wood lacquer.
In addition, the polyacrylate dispersoid and the polyisocyanate curing agent with excellent dispersibility are adopted, so that the system can be easily and uniformly mixed.
It is to be understood that within the scope of the present invention, the above-described features of the present invention and those specifically described below (e.g., in the examples) may be combined with each other to form new or preferred embodiments. Not to be reiterated herein, but to the extent of space.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The preferred embodiments and materials described herein are intended to be exemplary only.
Detailed Description
The inventor of the application researches extensively and deeply, develops a two-component waterborne polyurethane woodware varnish with stable performance in an activation period for the first time, after a varnish main paint and a curing agent are mixed, paint films with stable performance can be formed in different construction time, the tested performance reaches the requirements of C-type products in GB23999-2009, and the varnish has extremely high practical value. On the basis of this, the present invention has been completed.
In the present invention, the terms hydroxyl polyacrylate dispersion, matting agent, wetting agent, defoaming agent, thickener, leveling agent, anti-settling agent, preservative, dehydrating agent and hydrophilic aliphatic polyisocyanate are the same as those familiar to those skilled in the art, unless otherwise specified.
The term activation period generally refers to the time from the start of the completion of the dispensing period for which the paint ready for use in the can remains in a coatable state. In a popular way, the period of time during which the paint cannot be used after being prepared is called the activation period of the paint in the environment (temperature, humidity and the like).
Hydroxyl polyacrylate dispersions, i.e. hydroxyl-functional polyacrylate dispersions, can be used as binders for coatings. Two commercially available hydroxy polyacrylate dispersions (A), (B), (C), (
A 2846 XP、
A2845 XP), meets the requirement of hydroxyl functionality, has good dispersibility on a curing agent, high crosslinking degree of a coating film, excellent comprehensive performance of the paint film and moderate drying speed, can obtain the paint film with high hardness, good toughness and good tolerance after construction, and ensures that the performance of the paint film after construction can meet the requirement of GB on the product of waterborne wood.
For two-component aqueous polyurethane coating systems, the selection of an appropriate polyisocyanate curing agent is an important factor in determining the performance of the coating. Curing agents for two-component waterborne polyurethane coatings can be divided into two categories: unmodified polyisocyanates and modified polyisocyanates. Unmodified polyisocyanates difficult to mix homogeneously with the hydroxyl component, in low-speed stirred stripsThe phase separation phenomenon is easy to occur under the condition, so the application of the polyurethane resin in a two-component waterborne polyurethane system is greatly limited. For use in two-component systems, it is necessary to try to use polyisocyanates having low viscosity and reactivity, or to dilute them with solvents in order to reduce their viscosity. The most fundamental approach to uniformly mix the polyisocyanate component and the hydroxyl component is to hydrate the polyisocyanate. There are generally two approaches to achieve this goal, namely: external emulsification and internal emulsification. The former uses ionic or nonionic emulsifier, and realizes the dispersion in water by wrapping the surface of polyisocyanate by physical means, but has the defects of large using amount of emulsifier, coarse particles after dispersion, short working life, poor water resistance and the like, and thus has less application. In order to overcome the above drawbacks of the external emulsification method, many studies have been made in recent years on chemical modification, i.e., internal emulsification, of polyisocyanates with hydrophilic components which have good compatibility with polyisocyanates and serve as internal emulsifiers to contribute to dispersion of curing agents in aqueous phases. The invention selects and uses Bayer Material Science
XP2655 is a curing agent.
XP2655 is a easily dispersible sulfonate modified HDI tripolymer, the reaction rate of the HDI tripolymer curing agent and water is slow, and tests show that the-NCO content is higher than 90% after the HDI tripolymer curing agent is mixed with water for 6 hours, but the HDI tripolymer curing agent does not turn yellow, has good gloss retention, low viscosity and good stability; the curing agent has low reaction speed after paint mixing, so that enough-NCO groups are ensured to react with-OH in the hydroxyl dispersion in the drying process of a paint film, and the finally obtained paint film at different construction time has stable performance.
The product of the invention takes the water dispersible acrylic polyol dispersoid (namely hydroxyl polyacrylate dispersoid resin) as a hydroxyl component and takes the easily dispersible sulfonate modified HDI tripolymer as a polyisocyanate component, and the two components have good compatibility and are easy to mix. When the double-component product is mixed for use, the hydroxyl component and the polyisocyanate component can be uniformly mixed only by simple stirring without high-speed dispersion, so that the construction is convenient and the operability is strong.
In a preferred embodiment, the varnish of the present invention comprises the following components:
the component A comprises: main paint
Wherein the sum of the weight percentages of the A components is one hundred percent,
and B component: curing agent
29.64 wt% Propylene Glycol Diacetate (PGDA);
0.36 wt% of dehydrating agent;
hydrophilic aliphatic polyisocyanate curing agent
70wt％。
In a preferred embodiment, the ratio of component a: the preparation method of the main paint comprises the following steps:
firstly, adding hydroxyl acrylate dispersion resin and water accounting for 50 percent of the total weight of the water into a dispersion cylinder; and performing medium-speed dispersion at 600-800 r/min; then slowly adding the extinction slurry; dispersing at high speed of 1000-1500r/min for 10-15min, adding wetting agent, thickener, defoaming agent, leveling agent, anti-settling agent, preservative in the tank and residual water, dispersing at medium speed for 15-25min, sampling to detect that the fineness of the finished product is within 20-35 um and the viscosity is within 45-55KU, filtering, canning, packaging,
wherein the extinction slurry is a mixture of water, a dispersant, a pH regulator, an extinction slurry defoamer, propylene glycol and extinction powder; the water content was 80.5 wt%; the propylene glycol content was 2 wt%; the dispersant is acrylic polymer dispersant EDAPAN-480, the content of which is 3 wt%; the PH regulator is organic amine PH regulator AMP-95, and the content of the organic amine PH regulator AMP-95 is 0.3 wt%; the matting powder is fumed silica matting powder TS-100; the content thereof is 14 wt%; the extinction slurry defoaming agent is TEGOFoamex 810, and the content is 0.2 wt%, wherein the content is the weight percentage of the total weight of the extinction slurry.
In a preferred embodiment, the ratio of component B: the preparation method of the curing agent comprises the following steps:
adding Propylene Glycol Diacetate (PGDA) into a dispersion cylinder, weighing a dehydrating agent HK-TI, stirring at the speed of 600-800r/min, confirming that the water content is less than 0.05%, and adding a hydrophilic aliphatic polyisocyanate curing agent
XP2655, stirring at the speed of 800-1000r/min for 10-15 min.
In a preferred embodiment, the varnish of the invention is prepared as follows:
uniformly stirring the component A and the component B according to the mass ratio of 5:1, adding water according to the mass of the component A1/5, diluting and uniformly mixing, and standing for 10 min.
The features mentioned above with reference to the invention, or the features mentioned with reference to the embodiments, can be combined arbitrarily. All the features disclosed in this specification may be combined in any combination, and each feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose. Thus, unless expressly stated otherwise, the features disclosed are merely generic examples of equivalent or similar features.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out according to conventional conditions or according to conditions recommended by the manufacturers. Unless otherwise indicated, percentages and parts are percentages and parts by weight.
General procedure
(1) Measurement of hardness: the hardness test was carried out according to the specification of GB 23999-;
(2) impact resistance measurement: according to the specification of GB 1732-1979;
(3) and (3) flexibility measurement: according to the specification of GB 1731-1979;
(4) and (3) gloss measurement: according to the GB/T9754 specification;
(5) and (3) measuring the construction viscosity: the method is carried out according to the regulation of GB/T1723-93B.
Example 1
The component A and the component B are prepared according to the components and the weight percentage shown in the table 1.
TABLE 1 Components and weight percentages
a. Preparing a component A main paint: firstly, adding hydroxyl acrylate dispersion resin and water accounting for 50 percent of the total weight of the water into a dispersion cylinder; and performing medium-speed dispersion at 600-700 r/min; then slowly adding the extinction slurry; dispersing at a high speed of 1000-1300 r/min for 10-15min, adding a wetting agent, a thickening agent, a defoaming agent, a leveling agent, an anti-settling agent, a preservative in the tank and the residual water, dispersing at a medium speed for 15-25min, sampling to detect that the fineness of a finished product is within the range of 20-35 um and the viscosity is within the range of 45-55KU, filtering, canning and packaging.
Wherein the matting slurry is a mixture of water, acrylic polymer dispersant EDAPAN-480, organic amine PH regulator AMP-95, matting slurry defoamer TEGO Foamex 810, propylene glycol and gas-phase silicon dioxide matting powder TS-100; the water content was 80.5 wt%; the propylene glycol content was 2 wt%; the EDAPAN-480 content of the acrylic polymer dispersant is 3 weight percent; the content of AMP-95 serving as an organic amine pH regulator is 0.3 wt%; the content of the fumed silica extinction powder TS-100 is 14 wt%; TEGOFoamex 810 in an amount of 0.2 wt%, wherein the amounts are weight percentages of the total weight of the polishing slurry.
b. Preparing a component B curing agent: adding Propylene Glycol Diacetate (PGDA) into a dispersion cylinder, weighing a dehydrating agent HK-additive TI, stirring at the speed of 600-700 r/min, confirming that the water content is less than 0.05%, and adding a hydrophilic aliphatic polyisocyanate curing agent
XP2655, stirring for 10-15min at the speed of 900-1000 r/min.
c. Preparing a two-component waterborne polyurethane woodware varnish: uniformly stirring the component A and the component B according to the mass ratio of 5:1, adding water according to the mass of the component A1/5, diluting and uniformly mixing, and standing for 10 min.
The results are shown in Table 2.
TABLE 2 Performance test results
Example 2
The component A and the component B are prepared according to the components and the weight percentage shown in the table 1.
a. Preparing a component A main paint: firstly, adding hydroxyl acrylate dispersion resin and water accounting for 50 percent of the total weight of the water into a dispersion cylinder; performing medium-speed dispersion at 700-800 r/min; then slowly adding the extinction slurry; dispersing at high speed of 1200-1500 r/min for 10-15min, adding wetting agent, thickener, defoamer, flatting agent, anti-settling agent, preservative in the tank and residual water, dispersing at medium speed for 15-25min, sampling to detect that the fineness of the finished product is within 20-35 um and the viscosity is within 45-55KU, filtering, canning and packaging.
Wherein the matting slurry is a mixture of water, acrylic polymer dispersant EDAPAN-480, organic amine PH regulator AMP-95, matting slurry defoamer TEGO Foamex 810, propylene glycol and gas-phase silicon dioxide matting powder TS-100; the water content was 80.5 wt%; the propylene glycol content was 2 wt%; the EDAPAN-480 content of the acrylic polymer dispersant is 3 weight percent; the content of AMP-95 serving as an organic amine pH regulator is 0.3 wt%; the content of the fumed silica extinction powder TS-100 is 14 wt%; TEGOFoamex 810 in an amount of 0.2 wt%, wherein the amounts are weight percentages of the total weight of the polishing slurry.
b. Preparing a component B curing agent: adding Propylene Glycol Diacetate (PGDA) into a dispersion cylinder, and weighing dehydrating agent HK-adStirring at 700-800 r/min to confirm that the water content is less than 0.05%, and adding hydrophilic aliphatic polyisocyanate curing agent
XP2655, stirring at the speed of 800-900 r/min for 10-15 min.
c. Preparing a two-component waterborne polyurethane woodware varnish: uniformly stirring the component A and the component B according to the mass ratio of 4.8:1, adding water according to the mass of the component A1/5, diluting, uniformly mixing, and standing for 10 min.
The results are shown in Table 3.
TABLE 3 Performance test results
Example 3
The component A and the component B are prepared according to the components and the weight percentage shown in the table 1.
a. Preparing a component A main paint: firstly, adding hydroxyl acrylate dispersion resin and water accounting for 50 percent of the total weight of the water into a dispersion cylinder; dispersing at a medium speed of 650-800 r/min; then slowly adding the extinction slurry; dispersing at a high speed of 1350-1500 r/min for 10-15min, adding a wetting agent, a thickening agent, a defoaming agent, a leveling agent, an anti-settling agent, a preservative in the tank and the residual water, dispersing at a medium speed for 15-25min, sampling to detect that the fineness of a finished product is within the range of 20-35 um and the viscosity is within the range of 45-55KU, filtering, canning and packaging.
Wherein the matting slurry is a mixture of water, acrylic polymer dispersant EDAPAN-480, organic amine PH regulator AMP-95, matting slurry defoamer TEGO Foamex 825, propylene glycol and fumed silica matting powder TS-100; the water content was 80.5 wt%; the propylene glycol content was 2 wt%; the EDAPAN-480 content of the acrylic polymer dispersant is 3 weight percent; the content of AMP-95 serving as an organic amine pH regulator is 0.3 wt%; the content of the fumed silica extinction powder TS-100 is 14 wt%; TEGOFoamex 810 in an amount of 0.2 wt%, wherein the amounts are weight percentages of the total weight of the polishing slurry.
b. Preparing a component B curing agent: adding Propylene Glycol Diacetate (PGDA) into a dispersion cylinder, weighing a dehydrating agent HK-additive TI, stirring at the speed of 600-750 r/min, confirming that the water content is less than 0.05%, and adding a hydrophilic aliphatic polyisocyanate curing agent
XP2655, stirring at the speed of 800-1000r/min for 10-15 min.
c. Preparing a two-component waterborne polyurethane woodware varnish: uniformly stirring the component A and the component B according to the mass ratio of 5:1, adding water according to the mass of the component A1/5, diluting and uniformly mixing, and standing for 10 min.
The results are shown in Table 4.
TABLE 4 Performance test results
Example 4
The component A and the component B are prepared according to the components and the weight percentage shown in the table 1.
a. Preparing a component A main paint: firstly, adding hydroxyl acrylate dispersion resin and water accounting for 50 percent of the total weight of the water into a dispersion cylinder; dispersing at a medium speed of 650-750 r/min; then slowly adding the extinction slurry; dispersing at 1050-1450 r/min for 10-15min, adding a wetting agent, a thickening agent, a defoaming agent, a leveling agent, an anti-settling agent, a preservative in the tank and the residual water, dispersing at medium speed for 15-25min, sampling to detect that the fineness of a finished product is within the range of 20-35 um and the viscosity is within the range of 45-55KU, filtering, canning and packaging.
Wherein the matting slurry is a mixture of water, acrylic polymer dispersant EDAPAN-480, organic amine PH regulator AMP-95, matting slurry defoamer TEGO Foamex 810, propylene glycol and gas-phase silicon dioxide matting powder TS-100; the water content was 80.5 wt%; the propylene glycol content was 2 wt%; the EDAPAN-480 content of the acrylic polymer dispersant is 3 weight percent; the content of AMP-95 serving as an organic amine pH regulator is 0.3 wt%; the content of the fumed silica extinction powder TS-100 is 14 wt%; TEGOFoamex 810 in an amount of 0.2 wt%, wherein the amounts are weight percentages of the total weight of the polishing slurry.
b. Preparing a component B curing agent: adding Propylene Glycol Diacetate (PGDA) into a dispersion cylinder, weighing a dehydrating agent HK-additive TI, stirring at the speed of 650-800 r/min, confirming that the water content is less than 0.05%, and adding a hydrophilic aliphatic polyisocyanate curing agent
XP2655, stirring at the speed of 800-1000r/min for 10-15 min.
c. Preparing a two-component waterborne polyurethane woodware varnish: uniformly stirring the component A and the component B according to the mass ratio of 5.2:1, adding water according to the mass of the component A1/5, diluting and uniformly mixing, and standing for 12 min.
The results are shown in Table 5.
TABLE 5 Performance test results
From the results in tables 2-5, it can be seen that after the main paint is mixed with the curing agent, the paint films prepared at different times have stable performance within the specified working life, and the hardness performance meets the requirements of the national standard GB23999-2009 on the water-based wood lacquer.
All documents referred to herein are incorporated by reference into this application as if each were individually incorporated by reference. Furthermore, it should be understood that various changes and modifications of the present invention can be made by those skilled in the art after reading the above teachings of the present invention, and these equivalents also fall within the scope of the present invention as defined by the appended claims.
Claims (18)
1. A varnish composition, wherein the varnish composition comprises a polyurethane composition and a curing agent composition, wherein the polyurethane composition comprises:
45-95 parts by weight of hydroxyl polyacrylate dispersion resin;
5-20 parts of extinction slurry;
1-5 parts of wetting agent;
0.1-0.8 part by weight of defoaming agent;
0.3 to 1.5 weight portions of thickening agent;
0.1-1 part by weight of a leveling agent;
1-5 parts of an anti-settling agent;
0.1-0.5 part by weight of preservative;
8-20 parts by weight of water,
the curing agent composition comprises:
25-32 parts of propylene glycol diacetate;
0.2 to 0.5 weight portion of dehydrating agent;
60-80 parts by weight of hydrophilic aliphatic polyisocyanate,
the mass ratio of the polyurethane composition to the curing agent composition is 3-8: 1;
the hydroxyl polyacrylate dispersion resin comprises a weight ratio of 0.5-1.5: 1 of Bayhydrol A2846 XP and Bayhydrol A2845 XP;
the hydrophilic aliphatic polyisocyanate is a hydrophilic aliphatic polyisocyanate curing agent Bayhydur XP 2655.
2. The varnish composition of claim 1, wherein the hydroxyl polyacrylate dispersion resin comprises a weight ratio of 0.6 to 1.4:1 of Bayhydrol A2846 XP and Bayhydrol A2845 XP.
3. The varnish composition of claim 1, wherein the matting slurry comprises 78 to 82wt% of water, 1 to 3wt% of propylene glycol, 2 to 4wt% of a dispersant, 0.2 to 0.4wt% of a pH adjuster, and 13 to 14wt% of matting powder and 0.1 to 0.3wt% of a matting slurry antifoaming agent, the total content of the components being 100wt% based on the total weight of the matting slurry.
4. The varnish composition of claim 1, wherein the wetting agent is selected from the group consisting of: polyether group modified siloxane solution ByK 346, ByK345, polyether siloxane Digao TEGO 270, organosilicon wetting agent ADL-704, SILCOWET D-504/PEG, Dow wetting agent CF-10, wetting agent X-405 and fluorine surfactant FS-61; and/or
The defoaming agent is selected from: one or the combination of more than two of mineral oil type, organic silicon type or polyether type defoaming agents; and/or
The leveling agent is selected from: polyether modified siloxane TEGO GLIDE 450, TEGO 410, TEGO 432, TEgo FLOW425, ByK 310; and/or
The thickening agent is selected from: polyurethane type thickeners Rheovis PU 1290, Rohm and Haas RM-2020 and RM-895; and/or
The anti-settling agent is selected from: silica water solution AERODISP W7520N, Disparlon A-630-20X; and/or
The preservative is a preservative in the tank selected from: BIOX VFB1, Dow chemical BIOBANTM 551S; and/or
The molar ratio of-NCO of the hydrophilic aliphatic polyisocyanate to-OH of the hydroxyl polyacrylate dispersion resin is 1-2: 1; and/or
The mass ratio of the polyurethane composition to the curing agent composition is 4-6: 1.
5. The varnish composition of claim 1, wherein the defoamer is TEGO Foamex 810 or TEGO Foamex 825.
6. A varnish comprises a varnish main paint and a curing agent, wherein the varnish main paint is prepared from the following components in parts by weight:
45-95 parts by weight of hydroxyl polyacrylate dispersion resin;
5-20 parts of extinction slurry;
1-5 parts of wetting agent;
0.1-0.8 part by weight of defoaming agent;
0.3 to 1.5 weight portions of thickening agent;
0.1-1 part by weight of a leveling agent;
1-5 parts of an anti-settling agent;
0.1-0.5 part by weight of preservative;
8-20 parts by weight of water,
the curing agent is prepared from the following components in parts by weight:
25-32 parts of propylene glycol diacetate;
0.2 to 0.5 weight portion of dehydrating agent;
60-80 parts by weight of hydrophilic aliphatic polyisocyanate,
the mass ratio of the varnish main paint to the curing agent is 3-8:1,
the hydroxyl polyacrylate dispersion resin comprises a weight ratio of 0.5-1.5: 1 of Bayhydrol A2846 XP and Bayhydrol A2845 XP;
the hydrophilic aliphatic polyisocyanate is a hydrophilic aliphatic polyisocyanate curing agent Bayhydur XP 2655.
7. The varnish of claim 6 wherein the hydroxy polyacrylate dispersion resin comprises a weight ratio of 0.6 to 1.4:1 of Bayhydrol A2846 XP and Bayhydrol A2845 XP.
8. The varnish of claim 6 wherein the matting slurry comprises 78 to 82wt% of water, 1 to 3wt% of propylene glycol, 2 to 4wt% of a dispersant, 0.2 to 0.4wt% of a pH adjuster, and 13 to 14wt% of a matting powder and 0.1 to 0.3wt% of a matting slurry antifoaming agent, the sum of the contents of the components being 100wt% based on the total weight of the matting slurry.
9. The varnish of claim 6, wherein the wetting agent is selected from the group consisting of: polyether group modified siloxane solution ByK 346, ByK345, polyether siloxane Digao TEGO 270, organosilicon wetting agent ADL-704, SILCO WET D-504/PEG, Dow wetting agent CF-10, wetting agent X-405 and fluorine surfactant FS-61; and/or
The defoaming agent is selected from: one or the combination of more than two of mineral oil type, organic silicon type or polyether type defoaming agents; and/or
The leveling agent is selected from: polyether modified siloxane TEGO GLIDE 450, TEGO 410, TEGO 432, TEgo FLOW425, ByK 310; and/or
The thickening agent is selected from: polyurethane type thickeners Rheovis PU 1290, Rohm and Haas RM-2020 and RM-895; and/or
The anti-settling agent is selected from: silica water solution AERODISP W7520N, Disparlon A-630-20X; and/or
The preservative is a preservative in the tank selected from: BIOX VFB1, Dow chemical BIOBANTM 551S.
10. The varnish of claim 6 wherein the defoamer is TEGO Foamex 810 or TEGOFoamex 825.
11. The varnish of claim 6, wherein the varnish primer has a fineness of 20 to 35 microns.
12. The varnish of claim 6 wherein the viscosity of the varnish host is 45 to 55 KU.
13. The varnish of claim 6 wherein the mole ratio of-NCO of the hydrophilic aliphatic polyisocyanate to-OH of the hydroxy polyacrylate dispersion resin is 1-2: 1.
14. The varnish of claim 6, wherein the mass ratio of the varnish base paint to the curing agent is 4-6: 1.
15. A method of preparing a varnish according to any of claims 6 to 14, wherein the method of preparation comprises the following steps of preparing a varnish primer:
(i) mixing the hydroxyl polyacrylate dispersion resin with a portion of water to obtain a first mixture;
(ii) adding the extinction slurry into the first mixture, and mixing to obtain a second mixture;
(iii) adding the wetting agent, the defoaming agent, the thickening agent, the leveling agent, the anti-settling agent, the preservative and the residual water into the second mixture, mixing to obtain the varnish main paint,
wherein the part of water accounts for 40-60 wt% of the total weight of the water, and the weight parts of other components are as defined in claim 6.
16. The method as claimed in claim 15, wherein the first mixture is obtained by mixing at a medium speed of 600-; and/or
In the step ii), high-speed mixing is carried out at the speed of 1000-; and/or
In step iii), medium-speed mixing at 600-800r/min is adopted to obtain the varnish main paint.
17. The method of preparing a varnish according to claim 6, comprising the following steps of preparing a curing agent:
(a) mixing propylene glycol diacetate with the dehydrating agent at the mixing rate of 600-800 r/min;
(b) when the water content of the mixture obtained in the step a) is less than 0.05 percent, adding hydrophilic aliphatic polyisocyanate, wherein the mixing speed is 800-1000r/min, and the mixing time is 10-15min to obtain the curing agent.
18. The method of preparing the varnish of claim 6, wherein the method of preparing comprises the steps of:
(i) uniformly mixing the varnish main paint and the curing agent;
(ii) adding water to dilute and mix evenly, and standing to obtain the varnish, wherein the mass of the water is 10wt% -30wt% of the mass of the varnish main paint.
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| CN113956766B (en) * | 2021-11-03 | 2022-11-08 | 万华化学集团股份有限公司 | Long-activation-period water-based bi-component polyurethane coating and preparation method and application thereof |
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