CN101747689A - Iron oxide red aqueous color paste for wood coating and preparation thereof - Google Patents
Iron oxide red aqueous color paste for wood coating and preparation thereof Download PDFInfo
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Abstract
The invention relates to an iron oxide red aqueous color paste for wood coating, which comprises the following components in percentage by weight: 50-70% of iron oxide red pigment, 0.5-2.0% of surface modifier, 2.0-8.0% of wetting dispersant, 0.5-2.0% of defoamer, 0.05-0.2% of thickening agent, 0.5-2.0% of thixotropic agent, 0.1-0.5% of preservative and 20-40% of water. The color paste solid content is more than or equal to 60%, and fineness is less than 20 meshes; the color paste has strong tinting strength, stable color strength, high thixotropy and big viscosity during standby; viscosity is lowered when cutting; the color paste can be stably stored and does not have the defects of water distribution, clotting and the like; the color paste does not contain resin, can be compatible with various polymer emulsions and avoids the phenomena of flooding and floating of coating; the color paste takes water as dispersion medium and protects environment. The preparation method is as follows: firstly, preparing the surface-modified iron oxide red pigment powder, then preparing color paste predisperse body by the iron oxide red pigment powder, water and other assistants, and finally grinding to obtain the iron oxide red aqueous color paste. The color paste is used for mixing scarlet and light red aqueous wood true color coating and can be mixed with aqueous yellow color paste and aqueous blue color paste to prepare aqueous wood true color coatings with other colors.
Description
Technical field
The present invention relates to a kind of aqueous color paste, especially a kind of iron oxide red aqueous color paste that is used to prepare the real look coating of woodenware and preparation method thereof.
Background technology
A development trend of coating industry is that real look coating adopts the novel process of color paste toning to substitute the traditional technology of the direct mixed grinding color matching of pigment.Not only solvent based coating extensively adopts the color matching of solvent-borne type mill base at present, and aqueous architectural coating also uses the aqueous color paste color matching in a large number.Along with the water-borne coatings development of technology, water-borne wood coating begins to be applied, and it has proposed new requirement to aqueous color paste.With respect to building coating, woodwork coating is not only higher to performance requriementss such as hardness, fineness, film-forming properties, sticking power, tinting strength, opacifying powers, and color is abundanter, has the very big market requirement as red woodwork coating.This aqueous color paste to the preparation woodwork coating has proposed new requirement, and used pigment, auxiliary agent and preparation technology have its singularity.
The used pigment of pigment printing paste comprises mineral dye and pigment dyestuff.The pigment dyestuff strong coloring force extensively adopts in the solvent-borne type mill base.But because the surface tension of water is big, be difficult to disperse pigment dyestuff, so more be to adopt easily dispersive mineral dye in the aqueous color paste.Inorganic red pigment has broad variety, as red iron oxide, molybdenum red, red lead, cadmium red etc.With respect to other inorganic red pigment, red iron oxide opacifying power height, strong coloring force, resistance to acids and bases, solvent resistance and fast light good weatherability, and low price are so the red mill base of water-based generally all adopts ferric oxide red colorant.
Existing iron oxide red aqueous color paste, the subject matter of existence are that package stability is poor, and phenomenons such as branch water, precipitation caking just may take place in short duration; Coatings formulated is prone to loose colour and grows dim, returns degradation problem under thick, the tinting strength.Major cause one is that ferric oxide red colorant density is bigger, is easy under action of gravity; The 2nd, dispersion stabilization is bad, and pigment particles condenses.The selection and the proportioning that are the iron oxide red aqueous color paste raw material unreasonable after all, and preparation process also has weak point.
Summary of the invention
Purpose of the present invention:, provide prescription of a kind of novel iron oxide red aqueous color paste and preparation method thereof at the defective of existing iron oxide red aqueous color paste.This mill base has high thixotropic, high solids content, and fineness is little, shelf-stable, consistency is good, and characteristics such as strong coloring force are applicable to the color matching of the real look coating of indoor decorating aqueous wooden ware.
In order to realize the object of the invention, technical scheme of the present invention is carried out hydrophilic improvement by surface-modifying agent to the ferric oxide red colorant surface, improves the water dispersible property of pigment; Composite by wetting dispersing agent improved its dispersive ability to ferric oxide red colorant; Preferred by thixotropic agent, less consumption can form the pseudo-plasticity aqueous color paste, and viscosity was big when it was left standstill, and viscosity diminishes when being sheared, and effectively avoids disadvantageous effect; Do not add any resin, improve the consistency of itself and polymer emulsion; By optimization of preparation, make pigment macroparticle aggregate in system, can fully be opened into primary small-particle.
The prescription of iron oxide red aqueous color paste of the present invention (weight percent) composed as follows:
Ferric oxide red colorant 50-70
Surface-modifying agent 0.5-2.0
Wetting dispersing agent 2.0-8.0
Defoamer 0.5-2.0
Thickening material 0.05-0.2
Thixotropic agent 0.5-2.0
Sanitas 0.1-0.5
Deionized water 20-40;
Described surface-modifying agent is the polyacrylate of molecular weight 500-10000;
Described wetting dispersing agent is the composite of anionic and non-ionic type, and both proportionings are 0.5-2.0;
Described thixotropic agent is the silicates inorganic gel.
Ferric oxide red colorant can be that the ferrous salt oxidation makes, also can be that the molysite high-temperature calcination makes, can also can prepare by dried preparation by wet method, for satisfying the home made article of the standard GB1863-89 of People's Republic of China (PRC) first grade requirement, has certain price advantage.
Surface-modifying agent is the polyacrylate of molecular weight 500-10000, optimization polypropylene acid sodium or ammonium polyacrylate, and best is sodium polyacrylate.This properties-correcting agent not only physical adsorption in the surface of ferric oxide red colorant, and with the hydroxyl effect of surface of pigments, with the pigment lattice in the effect of Fe-O key, form firm chemical bond.Properties-correcting agent in the ferric oxide red colorant particle surface, improves its wetting ability by physical adsorption and chemisorption, and its water dispersible property is improved greatly.
Wetting dispersing agent is used to reduce the surface tension between ferric oxide red colorant and the water, make pigment particles surface fully wetting and be easy to disperse, and be adsorbed on the surface of dispersive pigment particles and constitute charge repulsion and/or space steric effect, prevent cohesion, keep stable dispersion state.The used wetting dispersing agent of the present invention is best with the composite effect of anionic and non-ionic type wetting dispersing agent.Wherein the anionic wetting dispersing agent is the SN-Dispersant5020 of poly carboxylic acid ammonium salt class such as Japanese SanNopco company, the non-ionic type wetting dispersing agent is the Hydropalat 140 of modified polyether class such as German Cognis company, the ratio 0.5-2.0 of the former with the latter.
Because aqueous color paste uses more wetting dispersing agent to reduce the surface tension of system, can produce a large amount of foams in process of production shearing force can't be transmitted; For preventing that the thickening material that the pigment precipitation adds from can make the foamy membranous wall thicken, elasticity increases, and foam is difficult for nature to be eliminated.Come control foam by adding defoamer for this reason.Suitable defoamer should have and presses down bubble and broken bubble effect, has short-term and secular defoaming effect again, also will avoid the aspects such as cohesion, paint film shrinkage cavity of color developing, pigment at pigment to have side effects.The defoamer that the present invention is fit to is silicone based defoamer, and it is best to carry out composite effect with two kinds of defoamers.A kind of is the FoamStar A34 of German Cognis company, it is the froth breaking material of special molecular structure and the synthetic product of polysiloxane, a kind of is the Dehydran 1620 of German Cognis company, and it is special modification alcohol and the mixture of polysiloxane, the ratio 1.0-3.0 of the former with the latter.
Aqueous color paste is dispersion medium with water, because the viscosity of water is very little, adds the viscosity that thickening material improves system for this reason, to prevent pigment precipitation caking.The thickening material that the present invention is fit to is selected from ether of cellulose and derivative thereof, association type or non-association type alkali swelling thickening material, or polyurethane thickener, and best is the polyurethanes associative thickener, as the SN-Thickener 612 of Japanese SanNopco company.
Though can come the viscosity of bigger raising system by adding more thickening material, effectively preventing pigment precipitation caking, the viscosity of mill base is too high to influence its use.For this reason, add thixotropic agent usually in mill base, form the mill base with thixotroping function, promptly be subjected to shear action when (as stirring) at mill base, viscosity temporarily descends, and when not being subjected to shear action (leaving standstill), returns to original viscosity again gradually.Have thixotropic mill base, viscosity is big when leaving standstill storage can effectively prevent the pigment precipitation, has flowability during use again and satisfies service requirements.The solvent-borne type mill base often adopts aerosil as thixotropic agent, but its thixotropy is subjected to the influence of system acid-basicity very big, when the pH value shows thixotropy less than 7 the time, and when the pH value greater than 7 the time, almost do not have the thixotroping function.Resin for being used for water-borne coatings is generally anionic, is weakly alkaline in order to keep shelf-stable, and the pH value is many in 810 scopes, and the mill base that therefore is used for water-borne coatings should not adopt the aerosil thixotropic agent.The aqueous color paste that is used for building coating at present is a thixotropic agent with the high-molecular weight ether of cellulose mostly, but needs very big usage quantity just to demonstrate certain thixotropy, and this brings negative impact to the performance of filming, and also is not suitable for the aqueous color paste of woodwork coating.Thixotropic agent of the present invention is selected from the silicates inorganic gel, mainly is magnesium aluminum silicate or Magnesium Silicate q-agent lithium salts, and best is lithium magnesium silicate.The silicates inorganic gel has sheet structure, under very little usage quantity, can set up three-dimensional structure by hydrogen bond in the weakly alkaline system, water retrogradation when mill base leaves standstill, and this structure is easy to be broken when being subjected to shearing.
Aqueous color paste is in storage process, and the dispersion medium water capacity is subject to microbial contamination, adds an amount of antimildew disinfectant and suppresses the microbial growth breeding, and the protection chromaticness is not damaged.Sanitas of the present invention is selected from isothiazolinone, benzimidazoles and piperazine triazines, as 1, the 2-benzisothiazole-3-ketone, 5-chloro-2-methyl-4-isothiazoline-3-ketone, 2-methyl-4-isothiazoline-3-ketone, six hydrogen-1,3,5 triethyl monarch triazines etc., best is 1, the 2-benzisothiazole-3-ketone.
The optimum raw material of mill base of the present invention is composed as follows:
Ferric oxide red colorant is the GB1863-89 first grade;
Surface-modifying agent is a molecular weight 500-10000 sodium polyacrylate;
The anionic wetting dispersing agent is the SN-dispersant 5020 of Japanese SanNopco company, and the non-ionic type wetting dispersing agent is the Hydropalat 140 of German Cognis company;
Defoamer is the FoamStar A34 and the Dehydran 1620 of German Cognis company;
Thickening material is the SN-thickener 612 of Japanese SanNopco company;
Thixotropic agent is a lithium magnesium silicate;
Sanitas is 1, the 2-benzisothiazole-3-ketone.
A kind of iron oxide red aqueous color paste for wood coating of the present invention, its concrete preparation process is as follows:
1) ferric oxide red colorant surface modification
Ferric oxide red colorant is placed under the high speed dispersor, under rotating speed 1500-2000rpm, add the aqueous solution of surface-modifying agent, mix 5-15min; Above-mentioned uniform mixture under agitation heats, 60-90 ℃ of reaction 0.5-2.0h; After reducing to room temperature, under the speed of the 3000rpm left and right sides, disperse 10-30min, the pigment particles aggregate is broken up, obtain the ferric oxide red colorant of surface modification with high speed dispersor.
2) mill base is pre-dispersed
Add deionized water in dispersion tank, place under the high speed dispersor, regulating rotating speed is about 1500rpm, adds part defoamer, wetting dispersing agent, mixes 5-10min; Speed drop slowly adds the ferric oxide red colorant powder of above-mentioned surface modification to the 1000rpm; Finish the back raising speed and to 3000rpm, disperse 30-45min; Reduce to 1500rpm, add thickening material, thixotropic agent, mould inhibitor and remaining defoamer, mix 10-20min; Shut down, leave standstill the predispersion that obtains mill base behind the froth breaking.
3) mill base grinds
The predispersion of mill base is ground on three-roller 2-5 time, detect fineness with Hegman grind gage after every grinding one time,, obtain the finished product iron oxide red aqueous color paste when fineness stops to grind during less than 20 Xie.
In sum, a kind of iron oxide red aqueous color paste for wood coating of the present invention has following characteristics:
1) good dispersity.Surface-modifying agent is to the hydrophilic improvement on ferric oxide red colorant surface, the composite and pigment of wetting dispersing agent elder generation surface modification, and pre-dispersed then, finally ground technology all makes the dispersing of pigments raising.
2) thixotropy height.Preferred thixotropic agent is suitable for the weakly alkaline system, and mill base just has good thixotropic property when consumption seldom, has avoided the disadvantageous effect of a large amount of use thixotropic agent to system.
3) shelf-stable.The good dispersion of pigment and the high thixotropic of mill base, dispersed small-particle is difficult for being condensed into macroparticle, and system viscosity is big when leaving standstill, and particle is free settling not, so mill base has good package stability.
4) consistency is good.Do not add any resin in the system, can be compatible with any ratio with various polymer emulsions, the disadvantage of avoid the coating loose colour, growing dim.
5) strong coloring force.Pigment easily disperses to have improved solid content, and solid content is not less than 60%, and pigment-dispersing reduces easily fineness, and fineness is less than 20 Xie, and it is rotten that shelf-stable has been avoided, and the good loose colour of having avoided of consistency grows dim, and these all help improving the tinting strength of mill base.
Iron oxide red aqueous color paste of the present invention can be to aqueous transparent basic coating toning preparation scarlet woodwork coating; Can be to aqueous white basic coating toning preparation light red woodwork coating; Can be used as one of three primary colors mill base,, prepare the woodwork coating of various real looks with the yellow mill base of water-based, the blue color paste deployment of water-based.
Comprise the real look coating of aqueous color paste of the present invention, be used for the application of indoor decorating woodenware.
Embodiment
The present invention further specifies with following three examples, but and does not mean that and only limit to these examples.
Embodiment 1: the preparation iron oxide red aqueous color paste
Paste formula:
Preparation process: after the solution of 650g H130 and 4.4g DC-35B, 20g deionized water mixed, heating under agitation, 80 ℃ of insulation 1.5h; After reducing to room temperature, disperse 15min down, obtain the ferric oxide red colorant of surface modification in high speed dispersor 3000rpm rotating speed.The dispersion tank that fills the 320g deionized water is placed under the high speed dispersor, open 1500rpm, add 5.0g propylene glycol, 4.0g FoamStar A34,2.4g Dehydran 1620 and 22.0g Hydropalat 140,16.0gSN-dispersant 5020, mix 10min; Transfer to 1000rpm, slowly add the ferric oxide red colorant of above-mentioned surface modification, rise to 3000rpm after adding, disperse 30min; Reduce to 1500rpm, add 1.2g SN-thickener 612,8.5g lithium magnesium silicate, 2.4g Alex F-252 and 2g FoamStarA34,1.2g Dehydran1620, mix 15min; Shut down, on three-roller, grind 3 times after leaving standstill froth breaking, obtain about 1000g iron oxide red aqueous color paste.
Main performance index:
Fineness (Jing)＜20
Solid content (w%) 64
Relative color strength (%) 100
(50 ℃/7d) no change of package stabilities
VOC
lw(g/L)： 45
Embodiment 2: the dark water-borne wood coating of preparation red iron oxide
Formulation for coating material:
Preparation process: the dispersion tank that will fill 760g NeoPacE-114 places under the high speed dispersor, and rotating speed transfers to 1500rpm, adds the uniform mixing liquid of 70g deionized water, 15g propylene glycol and 25g EFC 300, mixes 5min; Add 1.0g FoamStarA34,2.0g Dehydran1620,10.0g Hydropalat140,20.0g BYK190, mix 5min; The iron oxide red aqueous color paste that adds 100.0gDH-600A, 4.0g lithium magnesium silicate, 40.0g example one of the present invention, 2500rpm disperse 45min down; Rotating speed transfers to 1500rpm, adds 2.0g Perenol 1097A, 5.0g Perenol S5, disperses 10min; Add 0.5gFoamStarA34,0.5g Dehydran1620,1.0g DSX 3800 again, disperse 10min; Leave standstill froth breaking, 200 eye mesh screens filter, and obtain the dark water-borne coatings of about 1000g red iron oxide.
Main performance index (measuring) according to GB/T23999-2009:
Color is dark red
Fineness (Jing)＜30
Solid content (w%) 35.5
(50 ℃/7d) no change of package stabilities
VOC
lw(g/L) 160
Minimum film-forming temperature (℃)＜5
Surface drying (min)＜30
Do solid work (h)＜3
Sticking power (level) 0
Pencil hardness 2H
Embodiment 3: preparation red iron oxide light color water-borne wood coating
Formulation for coating material:
Preparation process: the dispersion tank that will fill 740g UC81 places under the high speed dispersor, and rotating speed transfers to 1500rpm, adds the uniform mixing liquid of 70g deionized water, 15g propylene glycol and 25g EFC 300, mixes 5min; Add 3.0g DispelairCF707,25g Dispers 715W, mix 5min; The iron oxide red aqueous color paste that adds 120.0g R-706,4.5g lithium magnesium silicate, 50.0g example one of the present invention, 2500rpm disperse 45min down; Rotating speed transfers to 1500rpm, adds 2.0g Perenol1097A, 5.0g BYK 380N, disperses 10min; Add 1.0g Dispelair CF707,0.8g DSX 3800, disperse 10min; Leave standstill froth breaking, 200 eye mesh screens filter, and obtain about 1000g red iron oxide light color water-borne coatings.
Main performance index (measuring) according to GB/T23999-2009:
Color is pale red
Fineness (Jing)＜30
Solid content (w%) 36.8
(50 ℃/7d) no change of package stabilities
VOC
lw(g/L) 150
Minimum film-forming temperature (℃)＜5
Surface drying (min)＜30
Do solid work (h)＜3
Sticking power (level) 0
Pencil hardness 2H.
Claims (10)
1. an iron oxide red aqueous color paste for wood coating is characterized in that, mill base comprises following raw materials by weight percent:
Ferric oxide red colorant 50-70
Surface-modifying agent 0.5-2.0
Wetting dispersing agent 2.0-8.0
Thixotropic agent 0.5-2.0
Defoamer 0.5-2.0
Thickening material 0.05-0.2
Sanitas 0.1-0.5
Deionized water 20-40;
Described surface-modifying agent is the polyacrylate of molecular weight 500-10000;
Described wetting dispersing agent is the composite of anionic and non-ionic type, and both proportionings are 0.5-2.0;
Described thixotropic agent is the silicates inorganic gel.
2. a kind of iron oxide red aqueous color paste for wood coating according to claim 1 is characterized in that described polyacrylate is selected from sodium polyacrylate or ammonium polyacrylate.
3. a kind of iron oxide red aqueous color paste for wood coating according to claim 1 is characterized in that described anionic wetting dispersing agent is selected from metal carboxylate, and described non-ionic type wetting dispersing agent is selected from the modified polyether class.
4. a kind of iron oxide red aqueous color paste for wood coating according to claim 1 is characterized in that silicates inorganic gel thixotropic agent is selected from magnesium aluminum silicate or lithium magnesium silicate.
5. a kind of iron oxide red aqueous color paste for wood coating according to claim 1 is characterized in that defoamer is the composite of two kinds of silicone based defoamers.
6. a kind of iron oxide red aqueous color paste for wood coating according to claim 1 is characterized in that thickening material is selected from ether of cellulose and derivative thereof, association type or non-association type alkali swelling thickening material, or polyurethane associative thickener.
7. a kind of iron oxide red aqueous color paste for wood coating according to claim 1 is characterized in that sanitas is selected from isothiazolinone, benzimidazoles or piperazine triazines.
8. according to the described a kind of iron oxide red aqueous color paste for wood coating of claim 1, it is characterized in that the raw material of mill base is as follows:
Ferric oxide red colorant is the GB1863-89 first grade;
Surface-modifying agent is a molecular weight 500-10000 sodium polyacrylate;
The anionic wetting dispersing agent is the SN-dispersant 5020 of Japanese SanNopco company, and the non-ionic type wetting dispersing agent is the Hydropalat 140 of German Cognis company, the former with the latter proportioning 0.5-2.0;
Thixotropic agent is the lithium magnesium silicate inorganic gel;
Defoamer is the FoamStar A34 and the Dehydran 1620 of German Cognis company, the former with the latter proportioning 1.0-3.0;
Thickening material is the SN-thickener 612 of Japanese SanNopco company;
Sanitas is 1, the 2-benzisothiazole-3-ketone.
9. the preparation method of each described a kind of iron oxide red aqueous color paste for wood coating of claim 1-9 is characterized in that: after ferric oxide red colorant and surface-modifying agent mix, react 0.5-2.0h down at 60-90 ℃, surface of pigments is carried out hydrophilic modifying; The pigment powder that adds modification in the uniform mixing liquid of deionized water, part defoamer and wetting dispersing agent adds thickening material, thixotropic agent, mould inhibitor and remaining defoamer after fully disperseing again, mixes, and obtains the mill base predispersion behind the froth breaking; On three-roller, grind 2-5 time, less than 20 Xie, obtain iron oxide red aqueous color paste until fineness.
10. the application of the described iron oxide red aqueous color paste of claim 1 is characterized in that, described iron oxide red aqueous color paste is used to prepare the coating of indoor decorating woodenware.
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