CN107099233B - Waterborne polyurethane composition with stable performance in activation period for woodware - Google Patents
Waterborne polyurethane composition with stable performance in activation period for woodware Download PDFInfo
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- CN107099233B CN107099233B CN201610831963.5A CN201610831963A CN107099233B CN 107099233 B CN107099233 B CN 107099233B CN 201610831963 A CN201610831963 A CN 201610831963A CN 107099233 B CN107099233 B CN 107099233B
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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 waterborne polyurethane composition with stable performance in an activation period for woodware, which comprises hydroxyl polyacrylate dispersion resin, a dispersing agent, titanium dioxide, matt paste, a film-forming auxiliary agent, a wetting agent, a defoaming agent, a thickening agent, a leveling agent, a preservative and water in parts by weight according to the parts by weight in the claims and the specification. After the white paint main paint prepared from the components is mixed with the curing agent, the paint films prepared in different mixing time have stable performance in the 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 double-component woodenware white paint, in particular to an 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 white paint with stable performance in the activation period is necessary.
Disclosure of Invention
The invention aims to provide a two-component waterborne polyurethane woodenware white paint with stable performance in an activation period and a preparation method thereof.
In a first aspect of the present 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 to 1.4:1, more preferably 0.7 to 1.35:1 or 0.75 to 1.33:1) of a hydroxy polyacrylate dispersion resin
A2846 XP and hydroxyl polyacrylate dispersion resin
A 2845XP。
In another preferred embodiment, the matt paste comprises 78-82wt% of water, 1-3wt% of propylene glycol, 2-4wt% of matt paste dispersing agent, 0.2-0.4wt% of pH regulator, 13-14wt% of matting powder and 0.1-0.3wt% of defoaming agent, based on the total weight of the matt paste, and the sum of the contents of the components is 100 wt%.
In another preferred example, the matting slurry dispersant is an acrylic polymer-based dispersant. The pH regulator is organic amine pH regulator, such as AMP-95 (Dow chemical). The matting powder is fumed silica matting powder. The extinction paste defoaming agent is selected from: TEGO FOAMEX810, DREWPLUS S-4386.
In another preferred embodiment, the humectant is selected from: polyether siloxane TEGO WET270, fluorine surfactant FS-61, polyether-based modified siloxane solution ByK 346, ByK 345, Digao TEGO 270, organosilicon wetting agent ADL-704, SILCO WET D-504/PEG, Dow wetting agent CF-10 and wetting agent X-405.
In another preferred embodiment, the defoaming agent is selected from: organic modified siloxane antifoam TEGO FOAMEX810, DREWPLUS S-4386, TEGO FOAMEX 825, antifoam NX from NOPOKE AIOLOGY CO., antifoam AM-1512 from ISHMANIA USA, ByK 066.
In another preferred embodiment, the leveling agent is selected from: polyether modified siloxanes Tego FLOW 425, Tego GLIDE410, Tego GLIDE 450, Tego 432, BYK 310.
In another preferred embodiment, the thickener is selected from the group consisting of: polyurethane type thickeners RM-895, Rheovis PU1290, Rohm and Haas RM-2020.
In another preferred embodiment, the dispersant is selected from: high molecular block copolymer solution DISPERBYK-190, DISPERBYK-194, DISPERBYK-199.
In another preferred embodiment, the preservative is an in-can preservative selected from the group consisting of: BIOX VFB1, Dow chemical BIOBANTM 551S.
In another preferred embodiment, the coalescent is selected from: tripropylene glycol butyl ether dalpad.c, dipropylene glycol monobutyl ether, lauryl alcohol esters, ethylene glycol, propylene glycol, hexylene glycol, ethylene glycol butyl ether, propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol butyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monopropyl ether.
The invention provides a white paint main paint, which is prepared from the following components in parts by weight:
in another preferred example, the fineness of the white paint main paint is 20-35 microns.
In another preferred embodiment, the viscosity of the white paint base paint is 95-105 KU.
The components are as described above.
In a third aspect of the present invention, there is provided a process for preparing a white paint base paint according to the second aspect, comprising the steps of:
(i) mixing the dispersing agent, titanium dioxide and part of water to obtain a first mixture;
(ii) adding the hydroxyl polyacrylate dispersion resin into the first mixture, and mixing to obtain a second mixture;
(iii) adding the extinction slurry into the second mixture, and mixing to obtain a third mixture;
(iv) adding the film forming auxiliary agent, the wetting agent, the defoaming agent, the thickening agent and the flatting agent into the third mixture, and mixing to obtain a fourth mixture;
(v) adding the preservative and the rest of water into the fourth mixture, mixing to obtain the main white paint,
wherein the partial water accounts for 20 to 30 weight percent of the total weight of the water, and the weight parts of other components are as described above.
In another preferred embodiment, the first mixture is obtained by high-speed mixing (mixing for 10-15min) at the speed of 1500-; and/or
Mixing at medium speed of 600-800r/min in the step ii) to obtain the second mixture; and/or
Mixing at a high speed of 1000-1500r/min in the step iii) (mixing for 10-15min) to obtain a third mixture; and/or
In the step iv), the fourth mixture is obtained by mixing at a medium speed of 600-800 r/min; and/or
And in the step v), mixing at a medium speed of 600-800r/min (mixing for 8-15min) to obtain the white paint main paint.
In a fourth aspect of the present invention, there is provided a white paint composition comprising the polyurethane composition of the first aspect and a hardener composition, wherein the hardener composition comprises:
20-30 parts of propylene glycol diacetate;
0.1 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:
23-26 parts of propylene glycol diacetate;
0.25 to 0.4 weight portion of dehydrating agent;
70-80 parts by weight of hydrophilic aliphatic polyisocyanate.
In another preferred example, the hydrophilic aliphatic polyisocyanate is a hydrophilic aliphatic polyisocyanate curing agent
XP 2655。
In a fifth aspect of the invention, a white paint is provided, which comprises the white paint main paint of the second aspect and a curing agent, wherein the curing agent is prepared from the following components in parts by weight:
20-30 parts of propylene glycol diacetate;
0.1 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 white paint 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 1.5-2.2:1, more preferably 1.64-1.89:1, even 1.7-1.8: 1.
In another preferred embodiment, the preparation method of the white paint comprises the following steps:
(i) uniformly mixing the white paint 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 white paint, wherein the mass of the water is 35wt% -45wt% of the mass of the main paint of the white paint, and the better mass is 40 wt%.
The polyurethane composition and the white paint have good practical performance, and after the main paint of the white paint and the curing agent are mixed, the 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.
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 white paint with stable performance in an activation period for the first time, the white paint main paint and a curing agent are mixed to form a paint film with stable performance in different construction time, the tested performance reaches the requirement of C-type products in GB23999-2009, and the paint 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, film-forming assistant, dispersant, matting agent, wetting agent, defoaming agent, thickener, leveling 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 2846XP、
A2845XP), meets the requirement of hydroxyl functionality, has good dispersibility on curing agents, high crosslinking degree of coating films, excellent comprehensive performance of the paint films and moderate drying speed, can obtain the paint films with high hardness, good toughness and good resistance after construction, and ensures the paint films after constructionThe paint film performance can meet the product requirements of GB for the 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. The unmodified polyisocyanate is difficult to be uniformly mixed with the hydroxyl component, and the phase separation phenomenon is easy to occur under the condition of low-speed stirring, so that the application of the unmodified polyisocyanate 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; because the curing agent has slow reaction speed after paint mixing, enough-NCO groups are ensured to be inThe paint film reacts with-OH in the hydroxyl dispersion in the drying process, so that the finally obtained paint film with 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 white paint of the 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
Propylene Glycol Diacetate (PGDA) 24.7 wt%;
0.3wt% of dehydrating agent;
hydrophilic aliphatic polyisocyanate curing agent
XP 2655 75wt％。
In a preferred embodiment, the ratio of component a: the preparation method of the main paint comprises the following steps:
firstly, adding water accounting for 25 percent of the total weight of the water into a dispersion cylinder, adding a dispersing agent and titanium dioxide, and dispersing at a high speed of 1000-1500r/min for 10-15 min; adding hydroxyl acrylate dispersion resin into the dispersion cylinder, and performing medium-speed dispersion at 600-800 r/min; secondly, slowly adding the extinction slurry; dispersing at a high speed of 1000-1500r/min for 10-15min, adding a mixed solution of a film forming aid, a wetting agent, a thickening agent, a defoaming agent and a leveling agent, dispersing at a medium speed for 10-15min, adding a preservative and the rest water in the tank, dispersing at the medium speed for 10min, sampling, detecting that the fineness of a finished product is within the range of 20-35 um and the viscosity is within the range of 95-105KU, filtering, canning and packaging,
wherein the extinction slurry is a mixture of water, extinction slurry dispersing agent, pH regulator, extinction slurry defoaming agent, propylene glycol and extinction powder; the water content was 80.5 wt%; the propylene glycol content was 2 wt%; the flatting agent is EDAPAN-480 which is an acrylic polymer dispersant and accounts for 3 wt%; the PH regulator is an 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 TEGO FOAMEX810 with the content of 0.2 wt%, wherein the contents are the weight percentages 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, stirring at the speed of 600-800r/min to confirm 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 white paint 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 A2/5, 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 is carried out according to the specification of GB/T23999-;
(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 water accounting for 25 percent of the total weight of the water into a dispersion cylinder, adding a dispersing agent and titanium dioxide, and dispersing at a high speed of 1500-; adding hydroxyl acrylate dispersion resin into the dispersion cylinder, and performing medium-speed dispersion at 600-800 r/min; secondly, slowly adding the extinction slurry; dispersing at high speed of 1200-1500 r/min for 10-15min, adding a film forming aid, a wetting agent TEGO WET270, a thickening agent, a defoaming agent TEGO FOAMEX810 and a mixed solution of a flatting agent, dispersing at medium speed for 10-15min, adding a preservative and the rest water in a tank, dispersing at medium speed for 10min, 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 95-105KU, 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 Foamex810, 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 at the speed of 800-1000r/min for 10-15 min.
c. Preparing a two-component waterborne polyurethane woodenware white paint: 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 A2/5, 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 water accounting for 25 percent of the total weight of the water into a dispersion cylinder, adding a dispersing agent and titanium dioxide, and dispersing at a high speed of 1500-; adding hydroxyl acrylate dispersion resin into the dispersion cylinder, and performing medium-speed dispersion at the speed of 750-800 r/min; secondly, slowly adding the extinction slurry; dispersing at a high speed of 1000-1500r/min for 10-15min, adding a film forming aid, a wetting agent TEGO WET270, a thickening agent, a defoaming agent TEGO FOAMEX810 and a mixed solution of a flatting agent, dispersing at a medium speed for 10-15min, adding a preservative and the rest water in the tank, dispersing at the medium speed for 10min, 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 95-105KU, 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 Foamex810, 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 600-750 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 woodenware white paint: 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 A2/5, 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 water accounting for 25 percent of the total weight of the water into a dispersion cylinder, adding a dispersing agent and titanium dioxide, and dispersing at a high speed of 1500-; adding hydroxyl acrylate dispersion resin into the dispersion cylinder, and performing medium-speed dispersion at 600-800 r/min; secondly, slowly adding the extinction slurry; dispersing at a high speed of 1250-1400 r/min for 10-15min, adding a film forming aid, a wetting agent TEGO WET270, a thickening agent, a defoaming agent TEGO FOAMEX810 and a mixed solution of a leveling agent, dispersing at a medium speed for 10-15min, adding a preservative and the rest water in the tank, dispersing at the medium speed for 10min, 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 95-105KU, 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 Foamex810, 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 800-900 r/min for 10-15 min.
c. Preparing a two-component waterborne polyurethane woodenware white paint: 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 A2/5, 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 water accounting for 25 percent of the total weight of the water into a dispersion cylinder, adding a dispersing agent and titanium dioxide, and dispersing at a high speed of 1500-; adding hydroxyl acrylate dispersion resin into the dispersion cylinder, and performing medium-speed dispersion at 600-800 r/min; secondly, slowly adding the extinction slurry; dispersing at a high speed of 1300-1500 r/min for 10-15min, adding a film-forming aid, a wetting agent fluorine surfactant FS-61, a thickening agent, a defoaming agent DREWPLUS S-4386 and a leveling agent, dispersing at a medium speed for 10-15min, adding a preservative and the rest water in the tank, dispersing at the medium speed for 10min, sampling, detecting the fineness of a finished product to be within the range of 20-35 um and the viscosity to be within the range of 95-105KU, 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 Foamex810, 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 600-800r/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.
c. Preparing a two-component waterborne polyurethane woodenware white paint: 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 A2/5, diluting and uniformly mixing, and standing for 10 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 (16)
1. A white paint composition comprising a polyurethane composition and a curing agent composition, wherein the polyurethane composition comprises:
45-80 parts by weight of hydroxyl polyacrylate dispersion resin;
0.5-5 parts by weight of a dispersant;
15-40 parts of titanium dioxide;
1-10 parts of extinction slurry;
0.5-5 parts of film-forming additive;
0.5-2 parts of wetting agent;
0.1-0.8 part by weight of defoaming agent;
0.3 to 1.5 weight portions of thickening agent;
0.3-1 part by weight of a leveling agent;
0.1-0.5 part by weight of preservative;
3-20 parts by weight of water,
the curing agent composition comprises:
20-30 parts of propylene glycol diacetate;
0.1 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 white paint composition according to 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 white paint composition according to claim 1, wherein the matt paste comprises 78 to 82wt% of water, 1 to 3wt% of propylene glycol, 2 to 4wt% of matt paste dispersing agent, 0.2 to 0.4wt% of pH regulator, 13 to 14wt% of matting powder and 0.1 to 0.3wt% of matting paste defoaming agent, based on the total weight of the matt paste, the sum of the contents of the components being 100 wt%.
4. The white paint composition according to claim 1, wherein the wetting agent is selected from the group consisting of: polyether siloxane TEGOWET 270, fluorine surfactant FS-61, polyether-based modified siloxane solution ByK 346, ByK 345, Digao TEGO 270, organosilicon wetting agent ADL-704, SILCO WET D-504/PEG, Dow wetting agent CF-10 and wetting agent X-405; and/or
The defoaming agent is selected from: organic modified siloxane defoamer TEGO FOAMEX810, DREWPLUS S-4386, TEGOFOAMEX 825, defoamer NX of NOPOKE AIOLIA CO., defoamer AM-1512 of ISHAN group USA, Pickle BYK 066; and/or
The leveling agent is selected from: polyether modified siloxane Tego FLOW 425, Tego GLIDE410, Tego GLIDE 450, Tego 432, BYK 310; and/or
The thickening agent is selected from: polyurethane type thickeners RM-895, RheovisPU 1290, Rohm-2020; and/or
The dispersant is selected from: high molecular block copolymer solution DISPERBYK-190, DISPERBYK-194, DISPERBYK-199; and/or
The preservative is a preservative in the tank selected from: BIOX VFB1, Dow chemical BIOBANTM 551S; and/or
The film-forming aid is selected from: tripropylene glycol butyl ether dalpad.c, dipropylene glycol monobutyl ether, lauryl alcohol esters, ethylene glycol, propylene glycol, hexylene glycol, ethylene glycol butyl ether, propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol butyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monopropyl ether; and/or
The mass ratio of the polyurethane composition to the curing agent composition is 4-6: 1; and/or
The molar ratio of-NCO of the hydrophilic aliphatic polyisocyanate to-OH of the hydroxyl polyacrylate dispersion resin is 1.5-2.2: 1.
5. The white paint is characterized by comprising a white paint main paint and a curing agent, wherein the white paint main paint is prepared from the following components in parts by weight:
45-80 parts by weight of hydroxyl polyacrylate dispersion resin;
0.5-5 parts by weight of a dispersant;
15-40 parts of titanium dioxide;
1-10 parts of extinction slurry;
0.5-5 parts of film-forming additive;
0.5-2 parts of wetting agent;
0.1-0.8 part by weight of defoaming agent;
0.3 to 1.5 weight portions of thickening agent;
0.3-1 part by weight of a leveling agent;
0.1-0.5 part by weight of preservative;
3-20 parts by weight of water,
the curing agent is prepared from the following components in parts by weight:
20-30 parts of propylene glycol diacetate;
0.1 to 0.5 weight portion of dehydrating agent;
60-80 parts by weight of hydrophilic aliphatic polyisocyanate,
the mass ratio of the main white 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.
6. The white paint according to claim 5, characterized in that the hydroxyl polyacrylate dispersion resin comprises, by weight, 0.6 to 1.4:1 of Bayhydrol A2846 XP and Bayhydrol A2845 XP.
7. The white paint according to claim 5, wherein the matt paste comprises 78 to 82wt% of water, 1 to 3wt% of propylene glycol, 2 to 4wt% of matt paste dispersing agent, 0.2 to 0.4wt% of pH regulator, 13 to 14wt% of matting powder and 0.1 to 0.3wt% of matt paste defoaming agent, based on the total weight of the matt paste, the sum of the contents of the components being 100 wt%.
8. The white paint according to claim 5, characterized in that the wetting agent is chosen from: polyether siloxane TEGO WET270, a fluorine surfactant FS-61, a polyether-based modified siloxane solution ByK 346, ByK 345, Digao TEGO 270, an organosilicon wetting agent ADL-704, SILCO WET D-504/PEG, a Dow wetting agent CF-10 and a wetting agent X-405; and/or
The defoaming agent is selected from: organic modified siloxane defoamer TEGO FOAMEX810, DREWPLUS S-4386, TEGOFOAMEX 825, defoamer NX of NOPOKE AIOLIA CO., defoamer AM-1512 of ISHAN group USA, Pickle BYK 066; and/or
The leveling agent is selected from: polyether modified siloxane Tego FLOW 425, Tego GLIDE410, Tego GLIDE 450, Tego 432, BYK 310; and/or
The thickening agent is selected from: polyurethane type thickeners RM-895, Rheovis PU1290, Rohm and Hass RM-2020; and/or
The dispersant is selected from: high molecular block copolymer solution DISPERBYK-190, DISPERBYK-194, DISPERBYK-199; and/or
The preservative is a preservative in the tank selected from: BIOX VFB1, Dow chemical BIOBANTM 551S; and/or
The film-forming aid is selected from: tripropylene glycol butyl ether dalpad.c, dipropylene glycol monobutyl ether, lauryl alcohol esters, ethylene glycol, propylene glycol, hexylene glycol, ethylene glycol butyl ether, propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol butyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monopropyl ether.
9. The white paint according to claim 5, wherein the fineness of the main paint is 20-35 μm.
10. The white paint according to claim 5, wherein the viscosity of the white paint base paint is 95-105 KU.
11. The white paint according to claim 5, wherein the mass ratio of the main paint to the curing agent is 4-6: 1.
12. The white paint according to claim 5, characterized in that the molar ratio of the-NCO of the hydrophilic aliphatic polyisocyanate to the-OH of the hydroxyl polyacrylate dispersion resin is 1.5-2.2: 1.
13. A process for the preparation of a white paint according to any one of claims 5 to 12, characterized in that it comprises the following steps for the preparation of a white paint base paint:
(i) mixing the dispersing agent, titanium dioxide and part of water to obtain a first mixture;
(ii) adding the hydroxyl polyacrylate dispersion resin into the first mixture, and mixing to obtain a second mixture;
(iii) adding the extinction slurry into the second mixture, and mixing to obtain a third mixture;
(iv) adding the film forming auxiliary agent, the wetting agent, the defoaming agent, the thickening agent and the flatting agent into the third mixture, and mixing to obtain a fourth mixture;
(v) adding the preservative and the rest of water into the fourth mixture, mixing to obtain the main white paint,
wherein the part of water accounts for 20-30 wt% of the total weight of the water, and the weight parts of other components are as defined in claim 5.
14. The method as claimed in claim 13, wherein the first mixture is obtained by high-speed mixing at 1500-; and/or
Mixing at medium speed of 600-800r/min in the step ii) to obtain the second mixture; and/or
In step iii), high-speed mixing is carried out at the speed of 1000-; and/or
In the step iv), the fourth mixture is obtained by mixing at a medium speed of 600-800r/min
And in the step v), mixing at a medium speed of 800r/min for 600-.
15. The method for preparing the white paint according to claim 5, wherein the method comprises the following steps of preparing the 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.
16. The method for preparing the white paint according to claim 5, wherein the method comprises the steps of:
(i) uniformly mixing the white paint main paint and the curing agent;
(ii) adding water to dilute and mix evenly, and standing to obtain the white paint, wherein the mass of the water is 35wt% -45wt% of the mass of the main paint of the white 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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