CN106398503A - Aqueous two-component polyurethane topcoat coating and preparation method thereof - Google Patents
Aqueous two-component polyurethane topcoat coating and preparation method thereof Download PDFInfo
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- CN106398503A CN106398503A CN201610829178.6A CN201610829178A CN106398503A CN 106398503 A CN106398503 A CN 106398503A CN 201610829178 A CN201610829178 A CN 201610829178A CN 106398503 A CN106398503 A CN 106398503A
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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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
- C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
- C08G18/622—Polymers of esters of alpha-beta ethylenically unsaturated carboxylic acids
- C08G18/6225—Polymers of esters of acrylic or methacrylic acid
- C08G18/6229—Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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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
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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
Abstract
The invention relates to an aqueous two-component polyurethane topcoat coating, which consists of a component A and a component B. The component A comprises the following raw materials in weight part: 15-32 parts of aqueous hydroxyl polyacrylate dispersoids, 12-30 parts of aqueous anionic polyacrylate dispersoids, 0.02-2 parts of antifoaming agent, 0.5-3 parts of leveling agent, 1-5 parts of wetting and dispersing agent, 0.2-4 parts of anti-sagging auxiliary agent, 0.3-1.5 parts of adhesion accelerant, 1-3 parts of anti-aging agent, 12-20 parts of ultraviolet-resistant filler, 10-20 parts of volume filler, and 8-30 parts of water. The component B comprises the following raw materials in weight part: 60-80 parts of hydrophilically modified aliphatic polyisocyanate curing agent and 20-40 parts of solvent. The topcoat coating is safe and environment-friendly, and the paint film thereof is smooth in appearance. Meanwhile, the aqueous two-component polyurethane topcoat coating is excellent in corrosion resistance and aging resistance, and simple in preparation method.
Description
Technical field
The invention belongs to technical field of environmental protection paint, particularly to a kind of aqueous double-component polyurethane topcoat paint and its system
Preparation Method.
Background technology
Aqueous polyurethane coating has excellent anti-corrosion and weatherability, is often used in the anti-of the surfaces such as metal, concrete
Shield, though excellent antiseptic property is many to add the antiseptic properties such as substantial amounts of iron oxide red, medium chrome yellow in coating system in order to obtain
But good harmful filler, causes very big injury to environment and human body in coating application and production process.
Adopting isocyanates as firming agent in the curing process due to isocyanide waterborne acrylic polyurethane surface paint coating more
Acid esters and water react easy and generate carbon dioxide, and cause film defect.
Zhou Mingji etc. in the literature (Zhou Mingji rectifys damp Zhao Yun of celebrating etc. the preparation of aqueous two-component polyurethane soft-feel coating and
Performance (J). Beijing Institute of Technology's journal, 2012,32 (12):1294-1297) to make PEPA by oneself, diisocyanate is
Raw material is respectively synthesized hydroxyl end aqueous polyurethane and aqueous polyurethane, and with hydrophilic aliphatic polyisocyanate for solidification
Agent, adds appropriate amount of addition agent and prepares aqueous two-component polyurethane soft-feel coating.Investigated PEPA relative molecular mass, two
The stability of the consumption of hydracrylic acid (DMPA) ,-OH/-NCO ratio etc. and coating, pencil hardness, adhesive force, pliability, water-fast
Relation between property, solvent resistance, chemical-resistant, scoring resistance and resistance to cosmetic moral character.Result of study finds:Synthesis aqueouss
The relative molecular mass of the PEPA used by dispersions of polyurethanes is 2000, DMPA mass fraction is 6%, synthesis of hydroxy end
- OH/-NCO=1.6 in aqueous pu dispersions, in solidification process during-NCO/-OH=1.5～1.6, the combination property of coating
Best.
Chinese patent CN 105505165 discloses a kind of scratch resistant bi-component waterborne glossy varnish and its preparation side
Method, this bi-component waterborne glossy varnish includes first component and second component, and wherein first component is secondary by hydroxyl polyacrylate
Dispersion, aqueous pu dispersions, defoamer, coalescents, wax emulsion, levelling agent, thickening agent and water composition；Second component by
Propylene-glycol diacetate and the composition of the hydrophilic aliphatic polyisocyanate containing hexamethylene diisocyanate.This clear finish except
There is excellent gloss, high richness, the features such as coating surface effect is good outside, with more prominent adhesion strength.
With loss of properties on aging of coating, be not suitable for the finish paint in the fields such as metal, concrete.
Content of the invention
An object of the present invention is the problems referred to above overcoming prior art to exist, and provides a kind of aqueous double-component poly- ammonia
Ester topcoat paint, this coating is a kind of water paint, safety and environmental protection, and paint film appearance is smooth, and antiseptic property and ageing properties are excellent,
And preparation method is simple.
The second object of the present invention is to provide the preparation method of this polyurethane finish coating.
The two-component coating that aqueous double-component polyurethane topcoat paint of the present invention is made up of component A and B component：
Wherein, component A is counted by weight, including following component：
Water-based hydroxyl polyacrylate dispersion 15-32 part, aqueouss anionic polyacrylate dispersion 12-30 part,
Defoamer 0.02-2 part, levelling agent 0.5-3 part, wetting dispersing agent 1-5 part, resist sagging auxiliary agent 0.2-4 part, adhesion promoter
0.3-1.5 part, age resister 1-3 part, the filler of resistance to ultraviolet 12-20 part, volume filler 10-20 part, water 8-30 part；
Wherein, B component is counted by weight, including following component：
Hydrophilic modifying aliphatic poly isocyanide acid as curing agent 60-80 part, solvent 20-40 part.
Water-based hydroxyl polyacrylate dispersion in component A of the present invention and aqueouss anionic polyacrylate dispersion
Based on resin, both mixed with resin with can be crosslinked with the hydrophilic modifying aliphatic polymeric isocyanate firming agent in B component
Film forming obtains water-tolerant, the excellent paint film of resistance to ag(e)ing；Water-based hydroxyl polyacrylate dispersion and hydrophilic modifying aliphatic
Polyisocyanate cross is main film forming matter；Water-based hydroxyl polyacrylate dispersion, aqueouss anionic polyacrylate divide
A prose style free from parallelism and hydrophilic modifying aliphatic polymeric isocyanate crosslinking can make that become paint film is water-fast, ageing-resistant performance improves.
The weight average molecular weight of water-based hydroxyl polyacrylate dispersion of the present invention is 3500-5000, preferably 4000-
4400.
The vitrification point of water-based hydroxyl polyacrylate dispersion of the present invention is 40-45 DEG C.
Preferably, the hydroxy radical content of described water-based hydroxyl polyacrylate dispersion is 3.5-4.0% (with hard resin
Meter)；PH value is 7-8.
Preferably, described water-based hydroxyl polyacrylate dispersion is hydroxy polyacrylate secondary breakup body.
Preferably, the mean diameter of described water-based hydroxyl polyacrylate dispersion is 0.1-0.2 μm.
Aqueouss anionic polyacrylate dispersion performance indications of the present invention are as follows：Non-volatile part is 48-51%,
When 23 DEG C, viscosity is 1000-3500mPa.s, counts hydroxy radical content as 3.5-4.0% with hard resin；PH value is 7-8；Close when 20 DEG C
Spend for 1.00-1.10g/ml.
Preferably, described aqueouss anionic polyacrylate dispersion is secondary breakup body.
Defoamer of the present invention is selected from brokenly bubble polysiloxane solution, polyether-modified polydimethylsiloxane solution, does not contain
One or more of the mixture of the brokenly bubble polysiloxanes of organosilicon and hydrophobic solid, silicon polyether oxide emulsion.Wherein brokenly bubble
Non-volatile part of polysiloxane solution is 15%-30%, and the nonvolatile component of polyether-modified polydimethylsiloxane solution is
50%-70%, the brokenly bubble polysiloxane solution without organosilicon and non-volatile part of hydrophobic solid mixture are 20%-38%,
Non-volatile part of the emulsion of silicon polyether oxide is 20%-35%.
Described defoamer preferred, polyethers modified dimethyl polysiloxane solution, without the brokenly bubble polysiloxanes of organosilicon with hate
Mixture in Polyethylene Glycol for the water solid compounds, and compounding weight ratio is (1-2):1.
Levelling agent of the present invention is selected from polyether modified siloxane solution, nonionic acrylic copolymer solution, ion
Type polyacrylate solution, polyether-modified acrylic compounds can be reunited dimethyl siloxane solution, polyether-modified acrylic functional
One or more of polydimethylsiloxane solution reunited, preferred, polyethers modified siloxane solution.
Wetting dispersing agent of the present invention is selected from low-molecular-weight polycarboxylic acid polymers' hydroxylammonium salts solution, multifunctional reunion
In the alcohol ammonium salt solution of compound, the alkyl ammonium salt and polysiloxane copolymer solution of polycarboxylic acid polymers of part neutralization one
Plant or multiple.Wherein the non-volatile part of low-molecular-weight polycarboxylic acid polymers hydroxylammonium salts solution-type wetting dispersing agent is 40%-
60%, non-volatile part of alcohol ammonium salt solution type wetting dispersing agent of polyfunctional group polymer is 30%-50%, and it is polynary that part neutralizes
The hydroxylammonium salts of carboxylic acid polyalcohol and the non-volatile part of polysiloxane copolymer solution-type wetting dispersing agent are 40%-60%；Preferably
The alcohol ammonium salt solution type wetting dispersing agent of polyfunctional group polymer.
Resist sagging auxiliary agent of the present invention is selected from polyurethane solutions, the polyurethane solutions of urea modification, poly- hydrocarbon carboxylic acids amide
One or more of solution.
Adhesion promoter described in adhesion promoter of the present invention is selected from nonionic compound class accelerator, silicon
Alkanes coupling agent, phthalate coupling agent etc., preferably silane coupling agent.Wherein said silane coupling agent is selected from γ-ammonia third
Base trimethoxy silane aminopropyl triethoxysilane 3- aminopropyl trimethoxysilane 3- glycydoxy front three
One of TMOS γ-methacryloxypropyl trimethoxy silane γ-mercaptopropyltriethoxysilane or many
Kind.
Antiaging agent of the present invention is selected from salicylate type ultraviolet light absorber, hindered amines radical scavenger, gold
Belong to complex quencher, one or more of from substituted acrylic ester, preferably salicylic acid esters with from substituted acrylate
Class compounds, and compounding weight ratio is for 1：(1-3).
The filler of resistance to ultraviolet of the present invention selects nm-class rutile-type titanium dioxide or Rutile type titanium dioxide or anatase titanium dioxide
Titanium dioxide, the preferably mixture of nm-class rutile-type titanium dioxide and common rutile titanium white lead, compounding weight is than for 1：(6-
10), the particle diameter≤100nm of described nm-class rutile-type titanium dioxide, preferably 30-80nm.
It is used nm-class rutile-type titanium dioxide and the mixture of rutile titanium white lead can improve painting as ageing-resistant filler
Layer resistance to ag(e)ing.
The excellent nm-class rutile-type titanium dioxide of serviceability is added in coating so that paint film has automatic cleaning action,
Extend paint film service life.
Volume filler of the present invention is selected from barium sulfate, Pulvis Talci, Calcium Carbonate, Kaolin, mica powder, micaceous iron oxide powder
One or more of, preferably talc powder, barium sulfate, mica powder compound, and compounding weight ratio is for 1：(0.5-1)：(0.5-1).
Biological environmental production anticorrosive packing 5-20 part, biological environmental production anticorrosive packing consumption mistake can also be added in component A of the present invention
Greatly, system pigment can be made to increase, resin is not enough to envelope excessive powder and makes paint film hole larger, under medium-resistance
Fall, relatively costly, consumption is too low, and antiseptic effect is poor, preferably 7-15 part.
Described biological environmental production anticorrosive packing is selected from the network of the metallic compound of the organic acid such as phytic acid and its compatibility
The complex of the organic acid such as compound, phytic acid and its compatibility metallic compound and rare earth compound, polymer phosphate root, molybdenum
The compatibility double salt such as acid group, silicate and double salt of rare earth etc.；
The complex of the metallic compound of wherein said phytic acid organic acid and its compatibility contains phytic acid
Salt, tannate and Muscovitum or Muscovitum system filler or micaceous iron oxide or ferrophosphorus powder, described proportioning raw materials weight portion is as follows：Flesh
Alcohol six phosphate: the weight of tannate is than for 10-20: the mixture of 7-14, phytate and tannate：Muscovitum or
The weight of Muscovitum system filler or micaceous iron oxide or ferrophosphorus powder is than for 1: 1-9；Described phytate includes zinc salt, aluminum
Salt, iron salt, calcium salt, manganese salt, titanium salt, nickel salt, strontium salt, barium salt.Biological environmental production anticorrosive packing preparation method is：With phytic acid
Salt, tannate and Muscovitum or Muscovitum system filler or micaceous iron oxide or phosphorus iron filings are raw material, prepare as follows：1、
Mixing：By Muscovitum or Muscovitum system filler or micaceous iron oxide or phosphorus iron filings are added to phytate and tannate mixes
Close, stir 1-5 hour；2nd, it is surface-treated：It is surface-treated adding surface conditioning agent in liquid after mixing；3rd, dry after washing
Dry, granularity is 0.5-4 μm, obtains containing phytate, tannate and Muscovitum or Muscovitum system filler or micaceous iron oxide
Or the biological environmental production anticorrosive packing of ferrophosphorus powder；Described surface conditioning agent is silane coupler, and consumption is the 1- of raw material gross weight
5%.
Wherein said phytic acid organic acid and its complex of compatibility metallic compound and rare earth compound, contain
Muscovitum or graphite, phytate and titanium, zirconium, tantalum, niobium wherein at least one, proportioning weight portion is：Muscovitum or graphite 50-85
Part, phytate 5-20 part, titanium 5-30 part, zirconium 5-16 part, tantalum 1-2 part, niobium 1-2 part；Described phytate bag
Include zinc salt, aluminium salt, iron salt, calcium salt, manganese salt, titanium salt, nickel salt, strontium salt, barium salt.Biological environmental production anticorrosive packing is made as follows
Standby：1st, respectively Muscovitum or graphite, phytate and titanium, zirconium, tantalum, niobium wherein at least one are made serosity；2nd, by titanium,
The serosity that zirconium, tantalum, niobium wherein at least one are made is added in Muscovitum or graphite serosity, stirs simultaneously；3rd, again by phytic acid
Salt serosity is added in the mixed liquor that second step obtains and stirs mixing；4th, add the mixed liquor that silane coupler obtains to the 3rd step
In be surface-treated；5th, finally wash, be dried to obtain containing Muscovitum or graphite, phytate and titanium, zirconium, tantalum, niobium
Wherein at least one biological environmental production anticorrosive packing；The consumption of silane coupler is the 2% of raw material gross weight.
The diisocyanate of industrialized production mainly has aliphatic isocyanates and aromatic isocyanate two big class.Fat
Race's isocyanates mainly have hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), dicyclohexyl methyl hydride
Diisocyanate (H12MDI).
Hydrophilic modifying aliphatic polymeric isocyanate firming agent in B component of the present invention is selected from different based on hexa-methylene two
The hydrophilic aliphatic polyisocyanate of cyanate, the hydrophilic aliphatic polyisocyanate based on isophorone diisocyanate
Or based on the hydrophilic aliphatic polyisocyanate of dicyclohexyl methyl hydride diisocyanate, it is preferably based on hexa-methylene two isocyanide
The hydrophilic aliphatic polyisocyanate of acid esters, performance indications are as follows：- NCO content is 20.7-21.7%, and when 23 DEG C, viscosity is
2500-4500, Hazen colour≤100, by weight isocyanate-monomer content<0.3%, density is 1.14-1.16g/cm3.
Solvent in B component of the present invention is used for reducing the viscosity of firming agent, selected from ethers, high boiling point esters, height boiling
One or more of point aromatic hydrocarbons, preferably high boiling point esters solvent, boiling point >=130 DEG C.
Preferably, the solvent in described B component is selected from propylene glycol methyl ether acetate, dipropylene glycol dimethyl ether, propylene glycol two
One or more of ethyl ester, dicarboxylic diester.
The preparation method of aqueous double-component polyurethane topcoat paint of the present invention is as follows：
(1) preparation method of component A：Water-based hydroxyl polyacrylate dispersion, aqueouss anionic polyacrylate are divided
A prose style free from parallelism, defoamer, levelling agent, wetting dispersing agent, resist sagging auxiliary agent, adhesion promoter, age resister and water blending, stir 5-
10 minutes；Add the filler of resistance to ultraviolet, volume filler high-speed stirred 30-40 minute.
(2) preparation method of component B：Solvent is added in hydrophilic modifying aliphatic polymeric isocyanate firming agent, fully stirs
Mix uniformly.
By component A and component B (3-5) in mass ratio when aqueous double-component polyurethane topcoat paint of the present invention uses：1 ratio
Apply after example mixing.
Need in step (1) to add together with volume filler with the filler of resistance to ultraviolet when adding biological environmental production anticorrosive packing.
Aqueous double-component polyurethane topcoat paint of the present invention is mainly used in the finish paint of metal, concrete etc. it is also possible to be used as
Priming paint, compared with prior art, the present invention has the advantages that：
(1) present invention passes through from suitable water-based hydroxyl polyacrylate dispersion and aqueouss anionic polyacrylic acid
The resin crosslinked film forming with hydrophilic modifying aliphatic polymeric isocyanate firming agent again based on ester dispersion mixing, water-tolerant,
Resistance to ag(e)ing is excellent.
(2) present invention reaches good outward appearance effect while being compounded and ensured compact in paint film from defoamer of good performance
Really.
(3) present invention compounds suitable anti-aging auxiliary agent raising coating resistance to ag(e)ing from titanium dioxide.
(4) this polyurethane finish coating with water for medium safety and environmental protection during production and construction usage, to human body hinder
Evil is less.
Specific embodiment
Below in conjunction with embodiment, embodiment of the present invention is described in detail, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and should not be taken as limiting the scope of the invention.
Table 1 is the proportioning raw materials of embodiment 1-6 and comparative example 1
In table 1, each components description of embodiment comparative example is as follows：
Water-based hydroxyl polyacrylate dispersion：Weight average molecular weight is 4000-4400, and when 23 DEG C, viscosity is 2000, glass
Change temperature and be 40-45 DEG C.Hydroxy radical content is 3.9% (in terms of hard resin)；PH value is 7.8, is two grades of hydroxy polyacrylate
Dispersion, mean diameter is 0.1-0.2 μm.
Aqueouss anionic polyacrylate dispersion：Non-volatile part is 48-51%, and when 23 DEG C, viscosity is 1000-
3500mPa.s, counts hydroxy radical content for 3.8% with hard resin；PH value is 7-8, and when 20 DEG C, density is 1.06g/ml.
Defoamer：Only with polyether-modified polydimethylsiloxane solution, other embodiments and comparative example adopt embodiment 5
Polyether-modified polydimethylsiloxane solution and the brokenly bubble polysiloxanes without organosilicon and hydrophobic solid are in Polyethylene Glycol
Mixture, compounding weight is than for 1:1；The trade mark of two kinds of defoamer is respectively：BYK019 and BYK1730.
Levelling agent：Polyether modified siloxane solution；The trade mark is：BYK348.
Wetting dispersing agent：The alcohol ammonium salt solution type wetting dispersing agent of polyfunctional group polymer；The trade mark is：BYK180.
Resist sagging auxiliary agent：The modified polyurethane solutions of urea；The trade mark is：BYK425.
Adhesion promoter：3- aminopropyl triethoxysilane.
Biological environmental production anticorrosive packing：50% solution of zinc sulfate is slowly added to 10% phytic acid and 7% list
In thujic acid mixed aqueous solution, stirring while adding, then use caustic alkali or ammonia to adjust PH=5-6, continue stirring 10 minutes, generate flesh
Alcohol six zinc phosphate and tannic acid zinc, phytic acid zinc and tannic acid zinc are mixed for 2: 3 by weight with Muscovitum, agitated 60
Minute, so as to uniform mix, is dried after washing, grinding particle size is 0.5-4 μm, obtains containing phytic acid zinc, tannic acid zinc
Biological environmental production anticorrosive packing with Muscovitum or micaceous iron oxide.
Nm-class rutile-type titanium dioxide：Particle diameter 30～80nm.
Age resister：Salicylic acid esters compound with from substituted acrylic ester, and compounding weight ratio is for 1：1.
Volume filler：Pulvis Talci, barium sulfate and mica powder compound, and compound proportion is 1：1：1.
Hydrophilic modifying aliphatic polymeric isocyanate：Hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate
Ester, performance indications are as follows：- NCO content is 20.7-21.7%, and when 23 DEG C, viscosity is 2500-4500, and Hazen colour≤100 are pressed
Weight meter isocyanate-monomer content<0.3%, density is 1.14-1.16g/cm3；
Solvent：Propylene glycol methyl ether acetate.
Table 1 embodiment 1-6 and the proportioning raw materials of comparative example 1, kilogram
In table 1, comparative example 1 removes water anionic polyacrylate dispersion on the basis of the formula of embodiment 6, real
Apply example 2 and with the addition of biological environmental production anticorrosive packing on the basis of embodiment 1.
Table 2 is the proportioning raw materials of embodiment 7-11 and comparative example 2-3.
In table 2, each components description of embodiment comparative example is as follows：
Age resister：The age resister of embodiment 12 adopts water only with salicylic acid esters age resister, other embodiment
Poplar esters of gallic acid compounds with from substituted acrylic ester, and compounding weight ratio is for 1：1, other identical with embodiment 11.
Other are identical with table 1.
Table 2 embodiment 7-11 and the proportioning raw materials of comparative example 2-3, kilogram
In table 2, comparative example 2 eliminates water-based hydroxyl polyacrylate dispersion, embodiment 12 on the basis of embodiment 11
Age resister only with salicylic acid esters age resister, other are identical with embodiment 11.
The preparation method of above example and comparative example waterborne two-component polyurethane coating is as follows：
(1) preparation method of component A：By water-based hydroxyl polyacrylate dispersion, aqueouss anionic polyacrylate
Dispersion, defoamer, levelling agent, wetting dispersing agent, resist sagging auxiliary agent, adhesion promoter and water blending, stir 10 minutes；Again
Add titanium dioxide, volume filler high-speed stirred 35 minutes；Add together with filler with titanium dioxide when adding biological environmental production anticorrosive packing
Enter.
(2) preparation method of component B：Solvent is added in hydrophilic modifying aliphatic polymeric isocyanate firming agent, fully stirs
Mix uniformly.By component A and component B in mass ratio 4 when aqueous polyurethane coating of the present invention uses：Apply after 1 ratio mixing
Apply.
Performance test：
Measure, by the method for testing that table 3 provides, the coating that embodiment and comparative example provide, and the corresponding coating of coating obtains
Paint film performance；The method wherein coating corresponding coating is spraying application, the wherein paint of pliability, adhesive force, resistance to impact
Film coating thickness is 20-30 μm, and water-fast, heat-resisting, salt fog resistance coating thickness is 60-80 μm.
Table 3 performance testing index and method
The performance test results of embodiment are shown in Table 4, table 5.
Table 4 embodiment 1-6 and the performance test results of comparative example 1
The embodiment of the present invention 2 with the addition of biological environmental production anticorrosive packing on the basis of embodiment 1, is further testing
Middle discovery, embodiment 2 salt fog resistance test than embodiment 1 extend 150 little when.
The difference from embodiment 6 for the embodiment of the present invention 5 is embodiment 5 only with polyether-modified polydimethylsiloxane
Solution defoaming agent, embodiment 6 adopt polyether-modified polydimethylsiloxane solution with without organosilicon brokenly bubble polysiloxanes and
Mixture in Polyethylene Glycol for the hydrophobic solid compounds, and finds in further testing, the salt fog resistance test of embodiment 6
Than embodiment 5 extend 50 little when because the paint film that two kinds of defoamer compound formation is finer and close, antiseptic property more preferably,
It can be seen that two kinds of defoamer compounding effects are more preferable.
Table 5 embodiment 7-11 and the performance test results of comparative example 2-3
The embodiment of the present invention 9, embodiment 10, the difference of embodiment 11 are all nanometers of the titanium dioxide of embodiment 9
Rutile type titanium dioxide, and all common rutile titanium white lead of embodiment 10, embodiment 11 is that the two is compounding, is more entering one
Find in the test of step, the test of the salt fog resistance of embodiment 11 than embodiment 9 extend 45 little when, extend than embodiment 10
70 hours, the artificial accelerated aging time extends more than 100 a hour than embodiment 9 and embodiment 10 it is seen that common rutile titanium
White lead and nm-class rutile-type titanium dioxide compounding effect are more preferable.
The embodiment of the present invention 11, the difference of embodiment 12 are the age resister of embodiment 12 only with salicylic acid esters
Age resister, embodiment 11 adopts salicylic acid esters to compound with from substituted acrylic ester, finds in further testing,
The artificial accelerated aging time of embodiment 11 extends more than 70 hour it is seen that salicylic acid esters replace third with oneself than embodiment 12
Olefin(e) acid esters compounding effect is more preferable.
Above content describes ultimate principle and the principal character of the present invention, and the present invention is not restricted to the described embodiments,
Without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, and these changes and improvements are all
Fall in scope of the claimed invention.
Claims (10)
1. a kind of aqueous double-component polyurethane topcoat paint is it is characterised in that in terms of parts by weight, the poly- ammonia of described bi-component waterborne
The two-component coating that ester paint is made up of component A and B component：
Wherein, component A is counted by weight, including following component：
Water-based hydroxyl polyacrylate dispersion 15-32 part, aqueouss anionic polyacrylate dispersion 12-30 part, froth breaking
Agent 0.02-2 part, levelling agent 0.5-3 part, wetting dispersing agent 1-5 part, resist sagging auxiliary agent 0.2-4 part, adhesion promoter 0.3-
1.5 parts, age resister 1-3 part, the filler of resistance to ultraviolet 12-20 part, volume filler 10-20 part, water 8-30 part；
Wherein, B component is counted by weight, including following component：
Hydrophilic modifying aliphatic poly isocyanide acid as curing agent 60-80 part, solvent 20-40 part；
The wherein said filler of resistance to ultraviolet is titanium dioxide；
By component A and component B (3-5) in mass ratio when described aqueous double-component polyurethane topcoat paint uses：1 ratio mixing.
2. aqueous double-component polyurethane topcoat paint according to claim 1 is it is characterised in that described water-based hydroxyl gathers
The weight average molecular weight of acrylate dispersoid is 3500-5000, preferably 4000-4400；
Preferably, the hydroxy radical content of described water-based hydroxyl polyacrylate dispersion is 3.5-4.0%, and pH value is 7-8.
3. aqueous double-component polyurethane topcoat paint according to claim 1 is it is characterised in that described aqueouss anion
The non-volatile part of type polyacrylate is 48-51%, and when 23 DEG C, viscosity is 1000-3500mPa.s, and hydroxy radical content is 3.5-4.0%；
PH value is 7-8；
Preferably, described aqueouss anionic polyacrylate dispersion is secondary breakup body.
4. aqueous double-component polyurethane topcoat paint according to claim 1 is it is characterised in that described defoamer is selected from
Brokenly bubble polysiloxane solution, polyether-modified polydimethylsiloxane solution, the brokenly bubble polysiloxanes without organosilicon and hydrophobic are solid
One or more of the mixture of body, silicon polyether oxide emulsion；
Preferably, described defoamer be polyether-modified polydimethylsiloxane solution, without organosilicon brokenly bubble polysiloxanes and
Mixture in Polyethylene Glycol for the hydrophobic solid compounds, and compounding weight ratio is (1-2):1.
5. aqueous double-component polyurethane topcoat paint according to claim 1 is it is characterised in that described levelling agent is selected from
Polyether modified siloxane solution, nonionic acrylic copolymer solution, ion-type polyacrylate solution, polyether-modified propylene
Acids can reunite dimethyl siloxane solution, polyether-modified acrylic functional reunite polydimethylsiloxane solution in one
Plant or multiple, preferred, polyethers modified siloxane solution；
Described resist sagging auxiliary agent is in the modified polyurethane solutions of polyurethane solutions, urea, poly- hydrocarbon carboxylic acids amide solution
One or more；
Described wetting dispersing agent is selected from low-molecular-weight polycarboxylic acid polymers' hydroxylammonium salts solution, the alcohol of polyfunctional group polymer
One of ammonium salt solution, the alkyl ammonium salt of polycarboxylic acid polymers of part neutralization and polysiloxane copolymer solution or many
Kind；The alcohol ammonium salt solution type wetting dispersing agent of preferred polyfunctional group polymer；
Described adhesion promoter nonionic compound class accelerator, silane coupling agent, phthalate coupling agent, preferably
Silane coupling agent.
6. aqueous double-component polyurethane topcoat paint according to claim 1 is it is characterised in that antiaging agent is selected from bigcatkin willow
Esters of gallic acid UV absorbers, hindered amines radical scavenger, metal complex quencher, from substituted acrylic ester
One or more, preferably salicylic acid esters compound with from substituted acrylic ester, and compounding weight ratio is for 1：(1-3).
7. aqueous double-component polyurethane topcoat paint according to claim 1 is it is characterised in that the described filler of resistance to ultraviolet
From nm-class rutile-type titanium dioxide or Rutile type titanium dioxide or anatase thpe white powder；Preferably nm-class rutile-type titanium white
Powder and the mixture of common rutile titanium white lead, compounding weight is than for 1：(6-10)；
Described volume filler is selected from one of barium sulfate, Pulvis Talci, Calcium Carbonate, Kaolin, mica powder, micaceous iron oxide powder
Or it is several；Preferably talc powder, barium sulfate, mica powder compound, and compounding weight ratio is for 1：(0.5-1)：(0.5-1).
8. aqueous double-component polyurethane topcoat paint according to claim 1 is it is characterised in that can also add in component A
Biological environmental production anticorrosive packing 5-20 part；Described biological environmental production anticorrosive packing is selected from phytic acid organic acid and its compatibility
The complex of the complex of metallic compound, phytic acid organic acid and its compatibility metallic compound and rare earth compound,
Polymer phosphate root, molybdate, silicate compatibility double salt and double salt of rare earth, consumption preferred 7-15 part.
9. aqueous double-component polyurethane topcoat paint according to claim 1 is it is characterised in that hydrophilic in described B component
Modified aliphatic polyisocyanate curing agent be selected from hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate,
Hydrophilic aliphatic polyisocyanate based on isophorone diisocyanate or be based on dicyclohexyl methyl hydride diisocyanate
Hydrophilic aliphatic polyisocyanate, be preferably based on the hydrophilic aliphatic polyisocyanate of hexamethylene diisocyanate；
Solvent in described B component is selected from one or more of ethers, high boiling point esters, high boiling aromatic hydrocarbons class, preferably high boiling ester
Class solvent.
10. according to claim 1 the preparation method of aqueous double-component polyurethane topcoat paint it is characterised in that including successively
Following steps:
(1) preparation method of component A：By water-based hydroxyl polyacrylate dispersion, aqueouss anionic polyacrylate dispersion,
Defoamer, levelling agent, wetting dispersing agent, resist sagging auxiliary agent, adhesion promoter, antiaging agent and water blending, stirring 5-10 divides
Clock；Add the filler of resistance to ultraviolet, volume filler high-speed stirred 30-40 minute；
(2) preparation method of component B：Solvent is added in hydrophilic modifying aliphatic polymeric isocyanate firming agent, is sufficiently stirred for all
Even.
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| CN116463041A (en) * | 2023-04-17 | 2023-07-21 | 深圳职业技术学院 | Double-component water-based polyurethane coating for coating of three-proofing paint machine and preparation method thereof |
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