CN104387938B - Preparation method for automobile chassis protection water-based paint - Google Patents
Preparation method for automobile chassis protection water-based paint Download PDFInfo
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- CN104387938B CN104387938B CN201410454053.0A CN201410454053A CN104387938B CN 104387938 B CN104387938 B CN 104387938B CN 201410454053 A CN201410454053 A CN 201410454053A CN 104387938 B CN104387938 B CN 104387938B
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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
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
-
- 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
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- 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
- C08G18/6237—Polymers of esters containing glycidyl groups of alpha-beta ethylenically unsaturated carboxylic acids; reaction products thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/30—Esters containing oxygen in addition to the carboxy oxygen containing aromatic rings in the alcohol moiety
- C08F220/305—Esters containing oxygen in addition to the carboxy oxygen containing aromatic rings in the alcohol moiety and containing a polyether chain in the alcohol moiety
- C08F220/306—Esters containing oxygen in addition to the carboxy oxygen containing aromatic rings in the alcohol moiety and containing a polyether chain in the alcohol moiety and polyethylene oxide chain in the alcohol moiety
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
Abstract
The invention relates to a preparation method for an automobile chassis protection water-based paint, which belongs to products of automobile paint system enterprises. The invention discloses a preparation method for an epoxy modified water-based acrylic polyester dispersion. The method includes: synthesis of a polyol oligomer modified methacrylic acid monomer, synthesis of an epoxy modified water-based acrylic resin prepolymer, and preparation of an epoxy modified water-based acrylic resin aqueous dispersion. The paint film formed by the paint provided by the invention has the advantages of high hardness, strong toughness, and excellent adhesion, can avoid chassis paint film surface destruction caused by gravel collision, provides a solution to the problems of high VOC content of automobile chassis paint in construction and large construction smell, and is safe, environment-friendly and low in cost.
Description
Technical field
The present invention relates to a kind of automobile chassis protection water paint.More particularly, to a kind of epoxy modified aqueous acrylic acid tree
The preparation of fat dispersion.
Background technology
Automobile chassis is to stand the most complicated, worst environment a part in automotive service life, from new car offline go out
To scrapping, chassis subjects the mission supporting vehicle body always for factory, experiencings the attack of the sandstone that the wheel of high-speed rotation is rolled, with
When be faced with the etches such as rain, snow, mud, further encounter scratch and the destruction on bumpy road surface once in a while.These severe use bars pair
Only did simply antiseptic chassis plate to be difficult to bear: the sandstone shock between not can lead to the anti-of chassis plate
Rust surface heavy damage, brand-new substrate of steel plate is easy to be got rusty by the dioxygen oxidation of in the air again, and especially air pollution is serious, goes out
Situations such as existing acid rain, on the road surface that chemical substance disappears snow and ice, the corrosion threat that chassis faces is even more serious.With social
Development, the recoverable amount of automobile is increasing, automobile chassis nurse coating new markets and repair market suffer from tempting huge
Potentiality, its economic benefit and social benefit are all very considerable.But it is as the fast development of Chinese Automobile Industry ', the environmental protection facing
Pressure is also increasing, and domestic automobile industry in automobile chassis spray painting, commonly use is traditional solvent based coating.voc
Content is high, causes serious environmental pollution, the health of the harm mankind in production and coating process.Reduce automobile chassis nursing
The voc discharge when producing with application for the coating, is necessary for adopting environment-friendly type coating, and wherein water paint is had with the replacement of substantial amounts of water
Machine solvent, is greatly reduced producing the volatile quantity with organic solvent in work progress, is an important development side of environmental protection coating material
To therefore, developing a kind of automobile chassis protection water paint has great Practical significance.
Content of the invention:
The invention aims to preparing a kind of automobile chassis protection water paint of environmental protection, replace traditional solvent
Type chassis paint.The present invention provides a kind of polyester dispersions of water soluble acrylic acid containing epoxy radicals and the aqueous automobile bottom using its preparation
Disk coating, using hydrophilic modifying isocyanates firming agent, the high hydroxyl content of resin fully can react with isocyanates, shape
The film becoming has high rigidity and obdurability, can avoid the chassis paint film surface breakdown that sandstone shock leads to.Meanwhile, epoxy radicals
Introducing strengthen the antiseptic effect of paint film, the paint film that can guarantee that formation under complex environment, such as acid rain, ice and snow, still
There is optimal resistance to water and resistance to all kinds of medium effect, set up the protection system of an environment-friendly and high-performance.
The invention provides a kind of preparation method of epoxy modified aqueous acrylic acid polyester dispersions:
1. the synthesis of the modified methacrylic acid monomer of polyol oligomer
In the reactor equipped with water knockout drum add 80-100 mass parts methacrylic acid, 280-320 mass parts many
First alcohol oligomer (weight average molecular weight 200-400, degree of functionality 2.0), the concentrated sulphuric acid of 0.3-0.6 mass parts, 0.03-0.06 mass parts
Phenolic inhibitor (to biphenol) and 200-240 mass parts toluene, stirring, temperature rising reflux reacts and branches away to water knockout drum
Water reach stopped reaction during theoretical value.Reaction terminate after, mixture wash with water removing unreacted polyol oligomer and
Sulphuric acid, then vacuum distillation remove toluene and obtain the modified methacrylic acid monomer of polyol oligomer.
2. the synthesis of epoxy modified aqueous acrylic acid resin prepolymer
The modified methacrylic acid monomer of polyol oligomer obtained by step 1 is washed away with 5% sodium hydroxide solution
It is dried after polymerization inhibitor and use.Under nitrogen protection, add the polyol oligomers after treatment of 80-100 mass parts in a kettle.
Thing modified methacrylic acid monomer, the toluene of the hydroxyethyl methylacrylate of 25-28 mass parts and 160-200 mass parts, stirring
Under be heated to 70-80 degree, constant temperature instill the glycidyl methacrylate of 18-22 mass parts, 0.85-0.90 part initiator with
The mixed solution of the toluene composition of 48-52 mass parts, about 1.5-2 hour drips off.Temperature is maintained to continue reaction 2-2.5 after dripping off
Stopped reaction after individual hour.Vacuum distillation removes toluene and obtains epoxy modified aqueous acrylic acid resin prepolymer.
3. the preparation of epoxy modified aqueous acrylic acid resin water dispersion
Under high-speed stirred, add 300-350 mass parts toward in the epoxy modified aqueous acrylic acid resin prepolymer of step 2
Deionized water emulsifying 30-50 minute, obtains its aqueous dispersion.
Oligomer polyol described above is PEPA or polyether polyol, preferably Polyethylene Glycol, polypropylene glycol
Or polyethylene glycol oxide-propylene oxide glycol.
Above-mentioned phenolic inhibitor is hydroquinone.
Above-mentioned initiator is aibn or bpo etc..
The positive effect of the present invention is embodied in three below advantage:
(1) present invention has synthesized a kind of epoxide modified water polyacrylic acid dispersion, has prepared automobile chassis guarantor
Shield water paint, has the characteristics that high rigidity, obdurability, corrosion resistance are strong, can effectively protect automobile chassis.
(2) solve the problems, such as that automobile chassis coating voc content is high, abnormal smells from the patient of constructing is big.
(3) it is directed to the various material of automobile chassis, all there is excellent adhesive force, can carry out the most effectively protecting.
(4) environmental protection, low cost, puts into less to the transformation of original environmental unit, has wide applicability.
Illustrate below by embodiment:
(1) material therefor in embodiment
In embodiment material therefor be only citing and it should not be assumed that limit the scope of the present invention.
Oligomer polyol used: Polyethylene Glycol peg200.
(2) performance of aqueous dispersion and method of testing:
Imido- and hydroxyl polyurethane aqueous dispersion are the main film forming substance of car paint, and its performance determines
The performance of finished product.The performance of synthesized aqueous dispersion in example is all within the scope of following table below.
Table one: the performance indications of aqueous dispersion
The concrete method of testing of properties is as follows:
1) mensure of non-volatile component
Take the flat ware of glass of a cleaning, claim its quality.Take a small amount of (1 ± 0.1g) testing sample flat in clean glass
In ware, it is transferred in 125 DEG C of baking oven, take out in baking oven after keeping 2h, stir sample with Glass rod, surface skining in addition
Broken, then ware is put back to baking oven.After sample constant weight, ware is transferred in exsiccator and is allowed to be cooled to room temperature, weigh its quality,
It is accurate to 1mg.Calculate the ratio that remaining solid part accounts for sample gross mass.Carry out parallel assay twice, average.
The content (n v) of the content (v) of volatile matter or non-volatile matter to be calculated with test product mass fraction, computing formula
As follows:
In formula:
m1The quality of sample, mg before heating；
m2The quality of sample, mg after heating under conditions of regulation；
The content of v volatile matter, is represented with mass percent；
The content of nv volatile matter, is represented with mass percent.
2) mensure of viscosity
The sample of proper amount of inorganic matter impurity is placed in beaker, removes air bubble.Cap upper surface ware, is placed on 25 ± 0.1 DEG C
In water bath with thermostatic control, intermittent stirring sample (but not introducing bubble) is until specimen temperature reaches homogeneous constant.Big according to sample viscosity
The suitable rotor of little selection and rotating speed.Install instrument, rotor is immersed in sample, makes sample reach the upper graticule of rotor.?
After 25 ± 0.1 DEG C of constant 10min, unclamp viscometer control bar, opening motor makes rotor continuously rotate, after pointer is stable, press
Lower finger needle control lever, simultaneously closes off motor, the reading in reading dish is to a decimal.Same sample repeats under same rotating speed
Reading twice.
The viscosity of sample is calculated as follows:
η=k a
In formula:
The viscosity of η sample, mpa s；
K instrument parameter, mpa s；
The arithmetic mean of instantaneous value of reading twice on a viscometer dial.
3) mensure of ph
Soaked glass electrode and rectified an instrument by the description of acidometer.Measure about 50ml imido- acrylic acid with graduated cylinder
Resin is poured into as sample in beaker, and beaker is put in 23 ± 1 DEG C of constant temperature bath, treats the temperature of specimen temperature and constant temperature bath
After reaching balance, will be inserted in beaker with distilling electrode that is water washed and being dried with soft absorbent paper, slightly after vibrational stabilization
It is measured, taking continuous three times and measuring fixed value is ph value measured value, gets decimal first.Same method measure remaining two
Individual sample is so that the difference of the ph value of three samples is not more than 0.3.The arithmetic mean of instantaneous value taking three Specimen Determination values is as final
Result.
4) mensure of density
At (23 ± 0.5) DEG C, weigh density bottle and simultaneously record its quality m1；Sample is filled density bottle, with there being suction
Spilling material wiped by the material of aqueouss, is gently wiped with rayon balls, and records quality m filling test product density bottle2.
The computational methods of density are as follows:
In formula, m1The quality of empty density bottle, g；
m2Fill the quality of the density bottle of sample, g；
vtThe volume of density bottle, ml.
5) mensure of acid number
Weigh sample 2.5g (being accurate to 0.2mg) to put in 250ml conical flask, add 50ml mixed solution (by 2 parts of toluene
It is made into by volume with the ethanol that 1 part of volume fraction is 95%, shake conical flask makes sample be completely dissolved, and can heat if necessary.
(concentration is 10g/l, the ethanol being 95% by volume fraction, methanol to add 4～10 phenolphthalein indicator solution in sample solution
Or the configuration of 2- propanol forms), with standard potassium hydroxide volumetric soiutions, (ethanol being 95% with volume fraction or methanol are prepared immediately
The solution becoming concentration to be 0.1mol/l, and deviates from carbonate, demarcates its concentration with Potassium Hydrogen Phthalate) to be titrated to appearance micro- red
Color, keeps the colour-fast as terminal of 30s, writes down consumed potassium hydroxide solution milliliter number.Make line blank test simultaneously.
It is calculated as follows acid number a:
In formula:
A acid number, consumes the milligram number scale of koh with every gram of sample；
v1Ethanolic potassium hydroxide standard titration solution consumption during titration sample, ml；
v2Ethanolic potassium hydroxide standard titration solution consumption, ml during blank assay；
The concentration of c ethanolic potassium hydroxide standard titration solution, mol/l；
The quality of m sample, g；
The molal weight of 56.10 potassium hydroxide, g/mol.
6) mensure of hydroxyl value
Weigh sample 2.5g (being accurate to 0.2mg) to put in 250ml conical flask, add 25ml pyridinium acetate solution (to press body
Long-pending ratio is prepared for 1:23), install rapidly reflux condensation mode bottle, slowly shake taper, so that sample is completely dissolved.Conical flask is dipped into
In oil bath, sample page is made to be located under the pasta of oil bath, in 115 ± 5 DEG C of constant temperature backflow 1h.Pasta is proposed conical flask, from cold
Solidifying pipe top adds 10ml water, then conical flask is dipped into reaction 10min in oil bath, and constantly shakes.Take out reflux, cold
To room temperature, then add 15ml n-butyl alcohol to rinse rinse condenser pipe inwall and conical flask from condensing tube top, add 2～8 phenolphthalein instructions
Liquid, with standard potassium hydroxide volumetric soiutions, (it is 0.1mol/l's that the ethanol being 95% with volume fraction or methanol are configured to concentration
Solution, and deviate from carbonate, demarcates its concentration with Potassium Hydrogen Phthalate) it is titrated to blush occurs, keep 30s colour-fast i.e.
For terminal, write down consumed potassium hydroxide solution milliliter number.Make line blank test simultaneously.
Hydroxyl value is calculated as follows:
In formula:
Ohv hydroxyl value, with the suitable potassium hydroxide milligram number scale of hydroxy radical content in every gram of sample；
v1Ethanolic potassium hydroxide standard titration solution consumption, ml during blank assay；
v2Ethanolic potassium hydroxide standard titration solution consumption during titration sample, ml；
The concentration of c ethanolic potassium hydroxide standard titration solution, mol/l；
The quality of m sample, g；
The molal weight of 56.10 potassium hydroxide, g/mol；
A acid number, consumes the milligram number scale of koh with every gram of sample.
The embodiment 1 of the present invention:
1. the synthesis of poly ethyldiol modified methacrylic acid monomer
The methacrylic acid of 86 mass parts, the Polyethylene Glycol of 300 mass parts is added in the reactor equipped with water knockout drum
The concentrated sulphuric acid of 200,0.5 mass parts, the phenolic inhibitor (to biphenol) of 0.05 mass parts and the toluene of 200 mass parts, stirring,
Temperature rising reflux reacts the water branching away to water knockout drum and reaches stopped reaction during theoretical value.After reaction terminates, mixture washes with water
Wash away unreacted PVOH and sulphuric acid, then vacuum distillation removing toluene obtains poly ethyldiol modified methacrylic acid
Monomer.
2. the synthesis of epoxy modified aqueous acrylic acid resin prepolymer
Poly ethyldiol modified methacrylic acid monomer obtained by step 1 washes away inhibition with 5% sodium hydroxide solution
It is dried after agent and use.
Under nitridation gas shielded, add the poly ethyldiol modified metering system after treatment of 100 mass parts in a kettle.
Acid monomers, the toluene of the hydroxyethyl methylacrylate of 26 mass parts and 200 mass parts, it is heated to 70 degree under stirring, constant temperature instills
The glycidyl methacrylate of 20 mass parts, 0.88 part of initiator aibn are molten with the mixing of the toluene composition of 50 mass parts
Liquid, about 1 hour drips off.Temperature is maintained to continue stopped reaction after 2 hours of reaction after dripping off.Vacuum distillation removes toluene and obtains final product
To epoxy modified aqueous acrylic acid resin prepolymer.
3. the preparation of epoxy modified aqueous acrylic acid resin water dispersion
Under high-speed stirred, add 300-350 mass parts toward in the epoxy modified aqueous acrylic acid resin prepolymer of step 2
Deionized water emulsifying 30 minutes, obtains its aqueous dispersion.
The purposes (Application Example) of the embodiment 2- product of the present invention:
In another embodiment in the present invention, provide a kind of preparation side of automobile chassis protection water paint
Method, it includes () taking grey black as a example:
1) in above-mentioned aqueous dispersion add dispersant, levelling agent, defoamer, wetting dispersing agent, titanium dioxide, Pulvis Talci,
White carbon black, water, obtain component a, and the addition of wherein each component is as follows:
Table two: basic components () taking grey black as a example
2) using component a with as component b hydrophilic modifying polyisocyanates according to a:b: the part by weight of water=3:1:3
Mix homogeneously, you can carry out construction spraying.
Using common testing methods in paint field, obtain the correlated performance such as table institute of automobile chassis protection water paint
Show:
Table three: the performance indications of automobile chassis protection water paint
| Project | Test result |
| Paint film appearance | Paint film is smooth |
| voc(g/l) | ≤80 |
| Construction solid part/wt% | ≥40 |
| Pliability | 1 |
| Pencil hardness | ≥2h |
| Adhesive force (cross-hatching) | ≤1 |
Claims (5)
1. a kind of preparation method of automobile chassis protection water paint, it includes existing automobile chassis protection coating preparation side
Outside method, it is characterized in that a kind of preparation method of epoxy modified aqueous acrylic acid resin dispersion:
(1) synthesis of the modified methacrylic acid monomer of polyol oligomer
Add the methacrylic acid of 80-100 mass parts in the reactor equipped with water knockout drum, the weight average of 280-320 mass parts divides
Son amount 200-400, the polyol oligomer of degree of functionality 2.0, the concentrated sulphuric acid of 0.3-0.6 mass parts, the phenol of 0.03-0.06 mass parts
Class polymerization inhibitor and the toluene of 200-240 mass parts, stirring, when temperature rising reflux reacts the water branching away to water knockout drum and is not further added by
Stopped reaction, after reaction terminates, mixture washes the unreacted polyol oligomer of removing and sulphuric acid, then vacuum distillation with water
Remove toluene and obtain the modified methacrylic acid monomer of polyol oligomer；
(2) synthesis of epoxy modified aqueous acrylic acid resin prepolymer
The modified methacrylic acid monomer of polyol oligomer obtained by step (1) washes away resistance with 5% sodium hydroxide solution
It is dried after poly- agent and uses, under nitrogen protection, add the polyol oligomer after treatment of 80-100 mass parts in a kettle.
Modified methacrylic acid monomer, the toluene of the hydroxyethyl methylacrylate of 25-28 mass parts and 160-200 mass parts, under stirring
Be heated to 70-80 degree, constant temperature instill the glycidyl methacrylate of 18-22 mass parts, 0.85-0.90 part initiator with
The mixed solution of the toluene composition of 48-52 mass parts, 1.5-2 hour drips off, and maintains temperature to continue reaction 2-2.5 after dripping off
Stopped reaction after hour；Vacuum distillation removes toluene and obtains epoxy modified aqueous acrylic acid resin prepolymer；
(3) preparation of epoxy modified aqueous acrylic acid resin water dispersion
Under high-speed stirred, add going of 300-350 mass parts toward in the epoxy modified aqueous acrylic acid resin prepolymer of step (2)
Ion water emulsification 30-50 minute, obtains its aqueous dispersion.
2. a kind of preparation method of automobile chassis protection water paint according to claim 1, is characterized in that polyhydric alcohol
Oligomer is PEPA or polyether polyol.
3. a kind of preparation method of automobile chassis protection water paint according to claim 1, is characterized in that polyhydric alcohol
Oligomer is Polyethylene Glycol, polypropylene glycol or polyethylene glycol oxide propylene oxide glycol.
4. the preparation method of a kind of automobile chassis protection water paint according to claim 1, is characterized in that phenols hinders
Poly- agent is hydroquinone.
5. a kind of preparation method of automobile chassis protection water paint according to claim 1, is characterized in that initiator
For aibn or bpo.
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| CN201410454053.0A CN104387938B (en) | 2014-09-06 | 2014-09-06 | Preparation method for automobile chassis protection water-based paint |
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| CN201410454053.0A CN104387938B (en) | 2014-09-06 | 2014-09-06 | Preparation method for automobile chassis protection water-based paint |
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| CN114672213A (en) * | 2022-04-27 | 2022-06-28 | 深圳市深赛尔股份有限公司 | Water-based polyester automobile coating and preparation method thereof |
| CN115058178A (en) * | 2022-06-29 | 2022-09-16 | 清远市浩宇化工科技有限公司 | Automobile finish, film thereof and preparation method |
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| CN103571302A (en) * | 2013-09-30 | 2014-02-12 | 浙江工业大学 | Water-based fluorine-containing epoxy paint |
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2014
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|---|---|---|---|---|
| US3945963A (en) * | 1974-01-07 | 1976-03-23 | Ppg Industries, Inc. | Water-based epoxy acrylic coating compositions |
| US5576360A (en) * | 1994-07-14 | 1996-11-19 | The Glidden Company | Low voc, aqueous dispersed, epoxy crosslinked polyester acrylic coatings |
| CN101544728A (en) * | 2009-03-23 | 2009-09-30 | 广州励宝精细化工有限公司 | Water paint base, preparation method thereof and water paint containing same |
| CN103483985A (en) * | 2013-09-18 | 2014-01-01 | 中山蓝海洋水性涂料有限公司 | High-gloss ethanol-tolerance water-based acrylic acid amino glass winebottle stoving varnish as well as preparation method and application thereof |
| CN103571302A (en) * | 2013-09-30 | 2014-02-12 | 浙江工业大学 | Water-based fluorine-containing epoxy paint |
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