CN109722154A - A kind of car repair aqueous polyurethane metal flash paint and preparation method thereof - Google Patents
A kind of car repair aqueous polyurethane metal flash paint and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of car repair aqueous polyurethane metal flash paints and preparation method thereof, belong to paint field.It is made of component A and B component the metallic finishe, and wherein component A includes water-based hydroxyl acrylic emulsion, aqueous aluminum powder slurry, pigment, coalescing agent, substrate wetting agents, defoaming agent, thickener, aluminium orientation auxiliary agent, UV absorbers, deionized water；B component includes HDI type isocyanate curing agent, anhydrous diluents, dehydrating agent.The invention is to make water-based hydroxyl acrylic emulsion by oneself as film-forming resin, have many advantages, such as zero VOC, quick-drying, high glaze, high rigidity, the aqueous polyurethane metal flash paint of preparation has the corrosion resistances such as excellent water-fast, acid and alkali-resistance, oil resistant, salt spray resistance and protects light colour retention, and paint film rate of drying is fast, painting ETL estimated time of loading can be shortened, improve repairing efficiency.
Description
Technical field
The present invention relates to metal flash paint more particularly to a kind of aqueous polyurethane metal flash paints applied to car repair
And preparation method thereof.
Background technique
In recent years, as China's car ownership grows continuously and fast and vehicle service life is continuously increased, automobile
Repair paint becomes one of fastest-rising coating variety of China's coating industry.However, domestic automobile repair paint is universal at present
Using traditional solvent type coating, solvent based coating all can inevitably discharge big weight organic in production and work progress
Object (VOC) and hazardous air pollutants (HAPS) are closed, human health is seriously endangered and pollute environment.Therefore, 2010, country
GB 24409-2009 " limits of harmful substances in the car paint " standard of promulgation, the considered critical discharge amount of car paint VOC；
At the beginning of 2015, National Ministry of Finance combines again with the State Tax Administration have been issued " about the notice for imposing the consumption tax to coating ",
" notice " is required from 1 day 2 months 15 years, and the coating to (VOC) content of volatile organic compounds under Construction State higher than 420g/L is in life
Production, consigned processing and import link impose the consumption tax, and the applicable tax rate is 4%.
For green, the sustainable development for meeting environmental requirements and pushing automobile repairing paint industry, automobile repairing paint is just
Develop towards Water-borne modification, high solid and powdery paints direction, and Water-borne modification is most effective approach.
Metal flash paint is can to change the finishing coat for showing different brightness and color with viewing angle, due to special
Metallic luster and enjoy great popularity, therefore carrying out coating to vehicle body using metal flash paint is current most popular technique.With water
Property acrylic resin be main film forming substance water-based metal metallic finishe can room-temperature self crosslinking, have fast drying, low cost etc. excellent
Point, but also generally existing difficult toning, ply adhesion difference and poor water resistance the shortcomings that；It is with aqueous polyester resin-amino resins
The water-based metal metallic finishe of main film forming substance good, good water resistance and chemical-resistant with adhesive force, but need to exist
Solidify under 140~180 DEG C of hot conditions.Car refinishing paint requires paint film adhesion excellent, gloss with higher, quick-drying, good
Good water resistance, chemical-resistant and resistance to ag(e)ing, it is necessary to being capable of low-temperature setting.
Summary of the invention
The present invention is based on the VOC emission for reducing car refinishing paint, a kind of novel super-low VOC, high glaze, high hard is provided
It spends, the water-based hydroxyl acrylic emulsion synthesis method of the ambient temperature curable of quick-drying；And it selects suitable auxiliary agents and prepares a adhesive force
It is excellent, car repair aqueous polyurethane metal flash paint and preparation method thereof of high glaze, high rigidity, quick-drying.The present invention produces
Product adhesive force is excellent, and water resistance, chemical-resistant and resistance to ag(e)ing are prominent, can compare favourably with same kind of products at abroad in performance,
And price is more cheap；Paint film rate of drying is improved on the basis of guaranteeing paint film good appearance and performance, when shortening coating
Between, to improve the production efficiency of auto vendor, have huge market potential.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of car repair aqueous polyurethane metal flash paint, the metal flash paint by component A and B component in mass ratio
4~10:1 composition, in which:
Component A presses the component of mass parts: 40-70 parts of water-based hydroxyl acrylic emulsion, aqueous aluminum powder starches 20-40 parts, pigment
1-5 parts, 2-4 parts of coalescing agent, 0.1-0.5 parts of substrate wetting agents, 0.1-1 parts of defoaming agent, 0.5-2 parts of thickener, aluminium powder orientation
Auxiliary agent 0.1-5 parts, 1-5 parts of UV absorbers, 0.1-10 parts of deionized water of arrangement；
B component presses the component of mass parts: 60-90 parts of HDI type isocyanate curing agent, 10-40 parts of anhydrous diluents, takes off
1-5 parts of aqua；
Wherein: the water-based hydroxyl acrylic emulsion is to be prepared via a method which to obtain:
(1) mass parts are pressed by 10-30 parts of methyl methacrylates, 2-10 parts of methacrylic acid positive definite esters, 5-15 parts of benzene second
Alkene, 20-30 part hydroxyethyl methacrylate, 8-12 parts of methacrylic acids, 10-15 parts of Isooctyl acrylate monomers, 10-15 parts of 2- first
All monomers are uniformly mixed by base -2- acrylic acid, 1-5 parts of mixed surfactants and 30-50 parts of distilled water under agitation
Prepare pre-emulsion；
(2) stirring of 10% pre-emulsion is added and is warming up to 75 DEG C, the potassium peroxydisulfate initiator for being added 0.3% keeps reaction temperature
75 DEG C of stirring polymerization 1h are spent, remaining pre-emulsion and initiator are slowly added in reaction flask simultaneously, addition, which finishes, to continue to stir
After mixing reaction 1h, 85 DEG C of heat preservation 2h are warming up to, are cooled to 40 DEG C, neutralizer is added and adjusts pH value 7.0-9.0, heat preservation
It filters, discharge after 20min, obtain water-based hydroxyl acrylic emulsion；
Aqueous aluminum powder slurry is to be prepared via a method which to obtain: under the state that stirs at low speed by 5-10 part distilled water with
5-10 parts of butyl glycol ethers are mixed evenly, and adjust high-speed mixer revolving speed and in 400-600r/min and sequentially add 0.05-
0.2 part of dimethyl ethanol amine neutralizer, 0.1-5 parts of dispersing agents and 10-20 parts of aluminium powders are dispersed with stirring uniformly to no agglomeration, obtain
Aqueous aluminum powder slurry.
In technical solution of the present invention:
Component A presses the component of mass parts: 50-70 parts of water-based hydroxyl acrylic emulsion, aqueous aluminum powder starches 30-40 parts, pigment
1-4 parts, 2-4 parts of coalescing agent, 0.1-0.4 parts of substrate wetting agents, 0.1-0.8 parts of defoaming agent, 1-2 parts of thickener, aluminium powder orientation
Auxiliary agent 0.5-4 parts, 2-5 parts of UV absorbers, 0.1-8 parts of deionized water of arrangement；
B component presses the component of mass parts: 70-90 parts of HDI type isocyanate curing agent, 10-30 parts of anhydrous diluents, takes off
1-5 parts of aqua.
In technical solution of the present invention: mixed surfactant described in water-based hydroxyl acrylic emulsion preparation method is ten
The mixture of sodium dialkyl sulfate, fatty alcohol polyoxyethylene ether ammonium sulfate and fatty alcohol polyoxyethylene ether, three's mixed proportion are
1:1.5:1.5.
In technical solution of the present invention: it is deep bamboo SN-1792, Bi Ke that aqueous aluminum powder, which starches dispersing agent described in preparation method,
BYK-192、One or more of Dispers 655 is according to any proportion combination.
In technical solution of the present invention: it is using silicon face cladding processing that aqueous aluminum powder, which starches aluminium powder described in preparation method,
One or more of love card HYDROLAN-501, Japan EMR-D6340, rising sun sun WL8005 are according to any proportion combination.
In technical solution of the present invention: the coalescing agent is dipropylene or dipropylene glycol methyl ether；
The substrate wetting agents be one or more of BYK-345, Tego Wet 270, Coadd W-130 according to
Any proportion combination；
The defoaming agent is polyether siloxane copolymer TEGO AIREX 901W；
The thickener is ten thousand China of polyurethane associative thickenerU902, hamming this RHEOLATE 299,
One or more of TEGO ViscoPlus 3010 is according to any proportion combination；
The aluminium orientation auxiliary agent is SN-9721；
The UV absorbers are-3821、BASF TINUVIN 400、BASF TINUVIN 123
One or more of according to any proportion combination.
In technical solution of the present invention: HDI type isocyanate curing agent described in B component be Bayhydur XP 2655,
One or more of CONONATE AQ-130, OS-9018 are according to any proportion combination；The anhydrous diluents are dipropyl
Glycol dimethyl ether；The dehydrating agent is BF-5.
A kind of preparation method of above-mentioned car repair aqueous polyurethane metal flash paint, it is described the preparation method comprises the following steps:
(1) preparation of component A, comprising the following steps:
Step a: water-based hydroxyl acrylic emulsion, aqueous aluminum powder slurry and pigment are mixed in proportion under stirring
Uniformly, coalescing agent, substrate wetting agents, defoaming agent, thickener, aluminium orientation auxiliary agent, ultraviolet light are then sequentially added
Absorbent is evenly stirred until no shrinkage cavity, is configured to the first mixed material；
(2) preparation of B component, comprising the following steps:
Step a: anhydrous diluents, dehydrating agent are added under stirring, are mixed evenly；
Step b: HDI type isocyanate curing agent is added, stirs evenly, is configured to the second mixed material；
(3) the first mixed material and the second mixed material are uniformly mixed according to 4~10:1 of mass ratio, target can be obtained
Product.
Beneficial effects of the present invention:
(1) synthesis technology of the present invention is simple, reaction temperature mild condition, and the water-based hydroxyl acrylic emulsion of synthesis has super
Low VOC, high glaze, high rigidity.
(2) present invention can be aqueous to adjust by the proportion of the soft or hard monomer of design, glass transition temperature, hydroxy radical content
Construction, film forming and its performance of polyurethane metal metallic finishe, the aqueous polyurethane metal flash paint of preparation have excellent resistance to
The corrosion resistances such as water, acid and alkali-resistance, salt spray resistance and guarantor's light colour retention.
(3) present invention can be designed and optimization by formula, select suitable coalescing agent, and by a variety of cured with isocyanates
Agent is compounded, and suitable solvent is selected to dilute, and adjusts the evaporation rate of solvent and water, is guaranteeing paint film good appearance and property
Paint film rate of drying is improved on the basis of energy, shortens and applies ETL estimated time of loading, improves repairing efficiency.
(4) product of the present invention car repair aqueous polyurethane metal flash paint can be with same kind of products at abroad phase in performance
It matches in excellence or beauty, and price is more cheap, market potential is huge.
Specific embodiment
Below with reference to embodiment, the present invention will be further described, and but the scope of the present invention is not limited thereto:
Each component ingredient and dosage in 1 Examples 1 to 4 of table
Each component ingredient and dosage in comparative example 1~4
In embodiment 1 water-based hydroxyl acrylic emulsion and aqueous aluminum powder slurry the preparation method is as follows:
The preparation of water-based hydroxyl acrylic emulsion: by mass parts by 18 parts of methyl methacrylates, 7 parts of methacrylic acids just
Determine ester, 11 parts of styrene, 28 parts of hydroxyethyl methacrylates, 8.5 parts of methacrylic acids, 14 parts of Isooctyl acrylate monomers, 12.5 parts
2- methyl -2- acrylic acid, 3 parts of mixed surfactants (lauryl sodium sulfate, fatty alcohol polyoxyethylene ether ammonium sulfate and rouge
The mixture of fat alcohol polyoxyethylene ether, three's mixed proportion under agitation will for 1:1.5:1.5) and 38.5 parts of distilled water
All monomers prepare pre-emulsion；In four mouthfuls of burnings equipped with thermometer, condensation reflux unit, monomer dropping device and agitating paddle
In bottle, the stirring of 10% pre-emulsion is added and is warming up to 75 DEG C, 0.3% potassium peroxydisulfate initiator is added, keeps reaction temperature 75
DEG C stirring polymerization 1h, residual monomer and initiator is instilled in reaction flask simultaneously, continuation is added dropwise in time for adding 4h
After being stirred to react 1h, 85 DEG C of heat preservation 2h are warming up to, are cooled to 40 DEG C, neutralizer is added and adjusts pH value 7.0-9.0, heat preservation
It filters, discharge after 20min, obtain water-based hydroxyl acrylic emulsion.
The preparation of aqueous aluminum powder slurry: 8.45 parts of distilled water and 5 parts of butyl glycol ethers are mixed and is stirred under the state that stirs at low speed
Mix uniformly, adjust high-speed mixer revolving speed 400-600r/min and sequentially add 0.05 part of dimethyl ethanol amine neutralizer,
4.5 part655 dispersing agent of Dispers and 12 parts of Japan's EMR-D6340 aluminium powders are dispersed with stirring uniformly to no agglomeration,
Obtain aqueous aluminum powder slurry.
In embodiment 2 water-based hydroxyl acrylic emulsion and aqueous aluminum powder slurry the preparation method is as follows:
The preparation of water-based hydroxyl acrylic emulsion: same as Example 1.
The preparation of aqueous aluminum powder slurry: 6.85 parts of distilled water and 3 parts of butyl glycol ethers are mixed and is stirred under the state that stirs at low speed
It mixes uniformly, adjusts high-speed mixer revolving speed and in 400-600r/min and sequentially add 0.15 part of dimethyl ethanol amine neutralizer, 2
Part Bi Ke BYK-192 dispersing agent and 18 parts of love block HYDROLAN-501 aluminium powders, are dispersed with stirring uniformly to no agglomeration, obtain aqueous
Aluminum paste.
In embodiment 3 water-based hydroxyl acrylic emulsion and aqueous aluminum powder slurry the preparation method is as follows:
The preparation of water-based hydroxyl acrylic emulsion: by mass parts by 26 parts of methyl methacrylates, 4 parts of methacrylic acids just
Determine ester, 6 parts of styrene, 22 parts of hydroxyethyl methacrylates, 11.5 parts of methacrylic acids, 12 parts of Isooctyl acrylate monomers, 10.5 parts
2- methyl -2- acrylic acid, 4.5 parts of mixed surfactants (lauryl sodium sulfate, fatty alcohol polyoxyethylene ether ammonium sulfate and
The mixture of fatty alcohol polyoxyethylene ether, three's mixed proportion under agitation will for 1:1.5:1.5) and 45 parts of distilled water
All monomers prepare pre-emulsion；In four mouthfuls of burnings equipped with thermometer, condensation reflux unit, monomer dropping device and agitating paddle
In bottle, the stirring of 10% pre-emulsion is added and is warming up to 75 DEG C, 0.3% potassium peroxydisulfate initiator is added, keeps reaction temperature 75
DEG C stirring polymerization 1h, residual monomer and initiator is instilled in reaction flask simultaneously, time for adding 3.5h, be added dropwise after
Continue after being stirred to react 1h, be warming up to 85 DEG C of heat preservation 2h, cool to 40 DEG C, neutralizer is added and adjusts pH value 7.0-9.0, protects
It filters, discharge after warm 20min, obtain water-based hydroxyl acrylic emulsion.
The preparation of aqueous aluminum powder slurry: 2.9 parts of distilled water and 6 parts of butyl glycol ethers are mixed under the state that stirs at low speed
Uniformly, it adjusts high-speed mixer revolving speed and in 400-600r/min and sequentially adds 0.1 part of dimethyl ethanol amine neutralizer, 5 parts
SN-1792 dispersing agent and 16 parts of rising sun sun WL8005 aluminium powders are dispersed with stirring uniformly to no agglomeration, obtain aqueous aluminum powder slurry.
In embodiment 4 water-based hydroxyl acrylic emulsion and aqueous aluminum powder slurry the preparation method is as follows:
The preparation of water-based hydroxyl acrylic emulsion: same as Example 3.
The preparation of aqueous aluminum powder slurry: 1.92 parts of distilled water and 4 parts of butyl glycol ethers are mixed and is stirred under the state that stirs at low speed
It mixes uniformly, adjusts high-speed mixer revolving speed and in 400-600r/min and sequentially add 0.08 part of dimethyl ethanol amine neutralizer, 4
Part mixed dispersant (Bi Ke BYK-192 and SN-1792, mixed proportion 1:3) and 20 parts of Japan's EMR-D6340 aluminium powders, stirring point
It dissipates uniformly to no agglomeration, obtains aqueous aluminum powder slurry.
In comparative example 1 water-based hydroxyl acrylic emulsion and aqueous aluminum powder slurry the preparation method is as follows:
The preparation of water-based hydroxyl acrylic emulsion: mass parts are pressed by 30 parts of methyl methacrylates, 3 parts of styrene, 18 parts
Hydroxyethyl methacrylate, 8 parts of methacrylic acids, 12 parts of Isooctyl acrylate monomers, 4.5 parts of mixed surfactant (dodecyls
The mixture of sodium sulphate, fatty alcohol polyoxyethylene ether ammonium sulfate and fatty alcohol polyoxyethylene ether, three's mixed proportion are 1:1.5:
1.5) and all monomers are prepared pre-emulsion under agitation by 32 parts of distilled water；Equipped with thermometer, condensing reflux dress
It sets, in the four-hole boiling flask of monomer dropping device and agitating paddle, the stirring of 10% pre-emulsion is added and is warming up to 75 DEG C, is added 0.3%
Potassium peroxydisulfate initiator, keep 75 DEG C of stirrings of reaction temperature to polymerize 1h, residual monomer and initiator instilled into reaction burning simultaneously
In bottle, time for adding 3.5h is added dropwise after continuing to be stirred to react 1h, is warming up to 85 DEG C of 2 h of heat preservation, cools to 40
DEG C, neutralizer is added and adjusts pH value 7.0-9.0, keeps the temperature filtering, discharging after 20min, obtains water-based hydroxyl acrylic emulsion.
The preparation of aqueous aluminum powder slurry: same as Example 3.
In comparative example 2 water-based hydroxyl acrylic emulsion and aqueous aluminum powder slurry the preparation method is as follows:
The preparation of water-based hydroxyl acrylic emulsion: by mass parts by 20 parts of methyl methacrylates, 8 parts of methacrylic acids just
Determine ester, 10 parts of styrene, 30 parts of hydroxy propyl methacrylates, 9 parts of methacrylic acids, 14 parts of Isooctyl acrylate monomers, 12 parts of 2- first
Base -2- acrylic acid, 3 parts of mixed surfactants (lauryl sodium sulfate, fatty alcohol polyoxyethylene ether ammonium sulfate and fatty alcohols
The mixture of polyoxyethylene ether, three's mixed proportion are that 1:1.5:1.5) and 38.5 parts of distilled water will own under agitation
Monomer prepares pre-emulsion；In the four-hole boiling flask equipped with thermometer, condensation reflux unit, monomer dropping device and agitating paddle,
The stirring of 10% pre-emulsion is added and is warming up to 75 DEG C, 0.3% potassium peroxydisulfate initiator is added, is kept for 75 DEG C of reaction temperature and stirred
Polymerization 1h is mixed, residual monomer and initiator are instilled in reaction flask simultaneously, time for adding 4h is added dropwise and continues to stir
After reacting 1h, 85 DEG C of heat preservation 2h are warming up to, are cooled to 40 DEG C, neutralizer is added and adjusts pH value 7.0-9.0, keeps the temperature 20min
It filters, discharge afterwards, obtain water-based hydroxyl acrylic emulsion.
The preparation of aqueous aluminum powder slurry: same as Example 1.
In comparative example 3 water-based hydroxyl acrylic emulsion and aqueous aluminum powder slurry the preparation method is as follows:
The preparation of water-based hydroxyl acrylic emulsion: same as Example 4.
The preparation of aqueous aluminum powder slurry: same as Example 4.
In comparative example 4 water-based hydroxyl acrylic emulsion and aqueous aluminum powder slurry the preparation method is as follows:
The preparation of water-based hydroxyl acrylic emulsion: same as Example 2.
The preparation of aqueous aluminum powder slurry: same as Example 2.
The preparation method of 1~example of embodiment 4,1~example of comparative example, 4 product:
The preparation method of component A: under stirring by water-based hydroxyl acrylic emulsion, aqueous aluminum powder slurry and pigment press than
Example is mixed evenly, and then sequentially adds coalescing agent, substrate wetting agents, defoaming agent, thickener, aluminium orientation and helps
Agent, UV absorbers are evenly stirred until no shrinkage cavity, are configured to the first mixed material；
The preparation of B component, comprising the following steps:
Step a: anhydrous diluents, dehydrating agent are added under stirring, are mixed evenly；
Step b: HDI type isocyanate curing agent is added, stirs evenly, is configured to the second mixed material；
First mixed material and the second mixed material are uniformly mixed, target product can be obtained.
In 2 present invention of table obtained car repair with aqueous polyurethane metal flash paint performance test report (embodiment 1~
4):
Obtained car repair reports (comparative example 1~4) with aqueous polyurethane metal flash paint performance test in the present invention:
Performance test
Lotion obtained by Examples 1 to 4 and aqueous aluminum powder slurry and 1~4 gained lotion of comparative example and aqueous aluminum powder slurry are taken
Car repair aqueous polyurethane metal flash paint is made in the formula of table 1.According to HG/T 4570-2013 " automobile water-based paint "
The standard method of defined carries out test plate (panel) production, maintenance and performance test, and resulting main coating property index is shown in Table 2.
By comparing the test result of embodiment 3 and comparative example 1 it can be concluded that suitable soft or hard by design
The proportion of monomer, glass transition temperature, hydroxy radical content can be made low VOC, high glaze, high rigidity water-based hydroxyl acrylic acid
Lotion, the aqueous polyurethane metal flash paint gloss of preparation is high, hardness is high, has excellent water-fast, acid and alkali-resistance, salt fog resistance
With guarantor's light colour retention.
By comparing the test result of embodiment 1 and comparative example 2 it can be concluded that selecting suitable carboxylic monomer
It is an important factor for improving car repair aqueous polyurethane metal flash paint stemness, due to the crosslinking of isocyanates and hydroxyl
In reaction, it is higher than secondary hydroxyl with the reactivity of primary hydroxyl, therefore select aqueous the third of the synthesis of hydroxyethyl methacrylate monomer
Olefin(e) acid lotion drying time is shorter, and hardness of film is higher.
By comparing the test result of embodiment 4 and comparative example 3 it can be concluded that passing through formula design and excellent
Change, select quick-dry type coalescing agent, and a variety of isocyanate curing agents are compounded, suitable solvent is selected to dilute, adjusts
The evaporation rate of solvent and water improves paint film rate of drying on the basis of guaranteeing paint film good appearance and performance, shortens coating
Time improves repairing efficiency.
By comparing the test result of embodiment 2 and comparative example 4 it can be concluded that UV absorbers are for height
It is essential with aqueous polyurethane metal flash paint to protect light colour retention car repair.(the comparative example when lacking UV absorbers
4), the gloss of coating, stemness and every mechanical performance no significant difference, water-fast and chemical-resistant are but resistance to also without being substantially reduced
Artificial weathering aging reduces obvious.
Claims (8)
1. a kind of car repair aqueous polyurethane metal flash paint, it is characterised in that: it is by component A and B component in mass ratio 4
~10:1 composition, in which:
Component A presses the component of mass parts: 40-70 parts of water-based hydroxyl acrylic emulsion, aqueous aluminum powder starches 20-40 parts, pigment 1-5
Part, 2-4 parts of coalescing agent, 0.1-0.5 parts of substrate wetting agents, 0.1-1 parts of defoaming agent, 0.5-2 parts of thickener, aluminium orientation
0.1-5 parts of auxiliary agent, 1-5 parts of UV absorbers, 0.1-10 parts of deionized water；
B component press mass parts component: 60-90 parts of HDI type isocyanate curing agent, 10-40 parts of anhydrous diluents, dehydrating agent 1-
5 parts；
Wherein: the water-based hydroxyl acrylic emulsion is to be prepared via a method which to obtain:
(1) by mass parts by 10-30 parts of methyl methacrylates, 2-10 parts of methacrylic acid positive definite esters, 5-15 parts of styrene,
20-30 parts of hydroxyethyl methacrylates, 8-12 parts of methacrylic acids, 10-15 parts of Isooctyl acrylate monomers, 10-15 parts of 2- methyl -2-
It is pre- that all monomers are uniformly mixed preparation under agitation by acrylic acid, 1-5 part mixed surfactant and 30-50 parts of distilled water
Emulsion；
(2) stirring of 10% pre-emulsion is added and is warming up to 75 DEG C, the potassium peroxydisulfate initiator for being added 0.3% keeps reaction temperature 75
DEG C stirring polymerization 1h, remaining pre-emulsion and initiator are slowly added in reaction flask simultaneously, and addition finishes that continue stirring anti-
After answering 1h, 85 DEG C of heat preservation 2h are warming up to, are cooled to 40 DEG C, neutralizer is added and adjusts pH value 7.0-9.0, after keeping the temperature 20min
Filtering, discharging, obtain water-based hydroxyl acrylic emulsion；
The aqueous aluminum powder slurry is to be prepared via a method which to obtain: by 5-10 parts of distilled water and 5-10 under the state that stirs at low speed
Part butyl glycol ether is mixed evenly, and adjusts high-speed mixer revolving speed and in 400-600r/min and sequentially adds 0.05-0.2 parts
Dimethyl ethanol amine neutralizer, 0.1-5 part dispersing agent and 10-20 parts of aluminium powders are dispersed with stirring uniformly to no agglomeration, obtain aqueous aluminium
Slurry.
2. a kind of car repair aqueous polyurethane metal flash paint according to claim 1, it is characterised in that:
Component A presses the component of mass parts: 50-70 parts of water-based hydroxyl acrylic emulsion, aqueous aluminum powder starches 30-40 parts, pigment 1-4
Part, 2-4 parts of coalescing agent, 0.1-0.4 parts of substrate wetting agents, 0.1-0.8 parts of defoaming agent, 1-2 parts of thickener, aluminium orientation
0.5-4 parts of auxiliary agent, 2-5 parts of UV absorbers, 0.1-8 parts of deionized water；
B component press mass parts component: 70-90 parts of HDI type isocyanate curing agent, 10-30 parts of anhydrous diluents, dehydrating agent 1-
5 parts.
3. a kind of car repair aqueous polyurethane metal flash paint according to claim 1, it is characterised in that:
Mixed surfactant described in water-based hydroxyl acrylic emulsion preparation method is lauryl sodium sulfate, poly alkyl alcohol
The mixture of ethylene oxide ether ammonium sulfate and fatty alcohol polyoxyethylene ether, three's mixed proportion are 1:1.5:1.5.
4. a kind of car repair aqueous polyurethane metal flash paint according to claim 1, it is characterised in that: aqueous aluminium
Dispersing agent described in slurry preparation method is deep bamboo SN-1792, Bi Ke BYK-192,One in Dispers 655
Kind is a variety of according to any proportion combination.
5. a kind of car repair aqueous polyurethane metal flash paint according to claim 1, it is characterised in that: aqueous aluminium
Aluminium powder described in slurry preparation method be using silicon face cladding processing love card HYDROLAN-501, Japan EMR-D6340,
One or more of rising sun sun WL8005 is according to any proportion combination.
6. a kind of car repair aqueous polyurethane metal flash paint according to claim 1, it is characterised in that:
The coalescing agent is dipropylene or dipropylene glycol methyl ether；
The substrate wetting agents are one or more of BYK-345, Tego Wet 270, Coadd W-130 according to any
Proportion combination；
The defoaming agent is polyether siloxane copolymer TEGO AIREX 901W；
The thickener is ten thousand China of polyurethane associative thickenerU902, hamming this RHEOLATE 299, TEGO
One or more of ViscoPlus 3010 is according to any proportion combination；
The aluminium orientation auxiliary agent is SN-9721；
The UV absorbers are- 3821, in BASF TINUVIN 400, BASF TINUVIN 123
One or more are according to any proportion combination.
7. a kind of car repair aqueous polyurethane metal flash paint according to claim 1, it is characterised in that: B component
The HDI type isocyanate curing agent be one of Bayhydur XP 2655, CONONATE AQ-130, OS-9018 or
It is a variety of to be combined according to any proportion；The anhydrous diluents are dimethyl ether；The dehydrating agent is BF-5.
8. a kind of preparation method of the car repair aqueous polyurethane metal flash paint as described in claim 1~8 is any, special
Sign is, it is described the preparation method comprises the following steps:
(1) preparation of component A, comprising the following steps:
Step a: water-based hydroxyl acrylic emulsion, aqueous aluminum powder slurry and pigment are mixed in proportion under stirring
It is even, then sequentially add coalescing agent, substrate wetting agents, defoaming agent, thickener, aluminium orientation auxiliary agent, UV Absorption
Agent is evenly stirred until no shrinkage cavity, is configured to the first mixed material；
(2) preparation of B component, comprising the following steps:
Step a: anhydrous diluents, dehydrating agent are added under stirring, are mixed evenly；
Step b: HDI type isocyanate curing agent is added, stirs evenly, is configured to the second mixed material；
(3) the first mixed material and the second mixed material are uniformly mixed according to 4~10:1 of mass ratio, target production can be obtained
Object.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111349384A (en) * | 2020-04-15 | 2020-06-30 | 南京长江涂料有限公司 | Weather-resistant water-based sand textured paint and preparation method thereof |
| CN112708031A (en) * | 2020-12-25 | 2021-04-27 | 嘉宝莉化工集团股份有限公司 | Water-based hydroxyl acrylic emulsion and preparation method and application thereof |
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| CN114525075A (en) * | 2022-03-15 | 2022-05-24 | 雅图高新材料股份有限公司 | Ultrafast-drying water-based varnish for automobile repair and preparation method thereof |
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| CN114836120A (en) * | 2022-05-10 | 2022-08-02 | 南京宇越水性涂料技术有限公司 | Preparation method and use method of water-based paint for automobile after-market |
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