CN102010648A - Floating coat-free shining base coat used for metal pieces and preparation method thereof - Google Patents
Floating coat-free shining base coat used for metal pieces and preparation method thereof Download PDFInfo
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- CN102010648A CN102010648A CN2010105635347A CN201010563534A CN102010648A CN 102010648 A CN102010648 A CN 102010648A CN 2010105635347 A CN2010105635347 A CN 2010105635347A CN 201010563534 A CN201010563534 A CN 201010563534A CN 102010648 A CN102010648 A CN 102010648A
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Abstract
The invention discloses floating coat-free shining base coat used for metal pieces and a preparation method thereof. The base coat comprises the following components in part by weight: 26 to 35 parts of polyester modified resin, 7 to 10 parts of amino resin, 3 to 8 parts of blocked aliphatic polyisocyanate, 4 to 10 parts of functional resin, 8 to 15 parts of rheologic control resin, 20 to 40 parts of solvent, 4 to 24 parts of pigments and fillers and 8 to 30 parts of other aids. The preparation process of the base coat comprises the following steps of: first, preparing color paste of coloring pigments and effect pigments; then, adding the residual polyester modified resin into a paint mixing kettle, adding the color paste of the coloring pigments and the effect pigments while stirring, and stirring fully after adding; finally, mixing colors slightly until the colors meet the requirement on the specified colors to obtain the floating coat-free shining base coat.
Description
Technical field
The present invention relates to a kind of coating, be specifically related to be used for basecoat of metalwork and preparation method thereof in a kind of coating process.
Background technology
At present, body of a motor car application main flow is three coating systems both at home and abroad, i.e. application ability cathode electrophoresis enamelled coating (also claiming the electrophoretic primer layer), middle doped envelope and top coat layer successively on the body material of automobile, top coat layer from inside to outside is divided into primary colours enamelled coating (also claiming the background color enamelled coating) and Lacquer finish enamelled coating (also claiming clearcoat layer or clear coat) usually again successively.For satisfying more and more stricter volatile organic compounds (VOC) emission regulation demands, American-European-Japanese developed country has brought into use water-borne coatings to satisfy the requirement of VOC discharging.Because water-borne coatings is different from traditional solvent based coating to construction process requirement, material cost height not only, facility investment and power consumption also significantly improve, and cause painting cost to improve.The present painting dressing automobiles line more than 98% of China still is a solvent-borne type traditional technology paint line.If do not change traditional coating system, do not transform original coating equipment, digest cost and energy consumption that applying waterborne coating increases, be extremely difficult.
Energy-conserving and emission-cutting technology at paint line, propose at present and use the Double bottom look coating process 2C1B(that is coated with in exempting from wherein 2C be meant the operation that sprays base coat and varnish successively, 1B instigates the operation that the base coat that sprayed and varnish are together dried).Mechanical property, weather resistance and the surface decoration performance of this coating process by improving base coat reaches the function of three paint coating technologies equally, and promptly this technology also possesses the various functions that substitute floating coat fully in the characteristic that guarantees the base coat paint film simultaneously; Compare with traditional three paint coating technologies, significantly reduced facility investment, strengthened energy-saving and emission-reduction, reduced technology usable floor area and production run cost.
And the floating coat that above-mentioned coating process saved is a very important coating, floating coat not only can be filled up the defective or the impression of electrophoretic primer laminar surface, increase the sticking power between base coat and the electrophoretic primer layer, and have anti-preferably stone and hit performance, profile pattern and weathering resistance.If without other change, behind the simple cancellation floating coat, ultraviolet ray shines directly on the electrophoretic primer layer after can seeing through top coat layer, and makes the conventional electrophoretic lacquer produce photoxidation decomposition and efflorescence, cause the bonding force of electrocoating paint and finish paint to reduce, finally cause the top coat layer be full of cracks and peel off.
When being coated with 2C1B technology during therefore employing is exempted from, the anti-stone that had of japanning hit during the base coat that uses need comprise, ultraviolet resistance irradiation, electrocoating paint surface fill, increase finish paint surface saturation ratio and increase functions such as sticking power, and required the characteristics such as the weathering resistance of base coat, ornamental, anti-scratch, anti-birds droppings and physical strength all should be good.
Be coated with 2C1B technology during employing is exempted from, on electrodeposited paint film, directly spray base coat, also ground and electrodeposited paint film surface quality are had relatively high expectations.For the stamping parts that adopts the lower Sheet Metal Forming Technology of state of the art to make, when being coated with 2C1B technology during utilization is exempted from, also can considerable influence be arranged to coating quality.
Chinese patent application document CN201073835Y(number of patent application 200720093941.X) disclose a kind of surface of steel workpiece exempt from the coloured coating structure of coating.First tunic at surface of steel workpiece is the phosphate conversion film, and second tunic is an electrophoretic paint layer, and trilamellar membrane is flash metal luster primary colours enamelled coating or true qualities primary colours enamelled coating, and the 4th tunic is transparent Lacquer finish enamelled coating.In 4 embodiment of the document, the coating structure of the surface of steel workpiece of embodiment 1 and embodiment 2 has four tunics, and the coating structure of the surface of steel workpiece of embodiment 3 and embodiment 4 then has only trilamellar membrane.The preceding two membranes of 4 embodiment is phosphate conversion film 1 and electrophoretic paint layer 2.The trilamellar membrane 3 of embodiment 1 is true qualities primary colours enamelled coating or true qualities top coat layer or double-level-metal flash of light primary colours enamelled coating, the Lacquer finish enamelled coating that the 4th tunic 4 is transparent.The trilamellar membrane 3 of embodiment 2 is flash metal luster primary colours enamelled coating that plays the priming paint effect and the flash metal luster primary colours enamelled coating that plays the effect of flash of light enamelled coating, and the 4th tunic 4 is transparent Lacquer finish enamelled coatings.The trilamellar membrane of embodiment 3 is a true qualities top coat layer 3.The trilamellar membrane 3 of embodiment 4 is flash metal luster primary colours lacquer or true qualities primary colours enamelled coating.
Above-mentioned document has just provided the functional title of film and the thickness of film (18～40 μ m) when describing trilamellar membrane 3, not the trilamellar membrane that does not openly have floating coat and have the floating coat function with the coating realization of which kind of composition.
Summary of the invention
The purpose of this invention is to provide can play in a kind of use floating coat and the effect of primary colours enamelled coating be used for metalwork exempt to be coated with basecoat and preparation method thereof.
The technical scheme that realizes the object of the invention be a kind of be used for metalwork exempt to be coated with basecoat, the component that comprises following weight part: 26～35 parts of polyester modification resins, 7～10 parts in aminoresin, 3～8 parts of dead front type aliphatic polymeric isocyanates, 4～10 parts of functional resins, 8～15 parts of rheology control resins, 1～6 part of tinting pigment, 0.5～8 part of effect pigment, 3～10 parts of fillers, 2～5 parts of 2～8 parts of dispersion agents of light stabilization aid, 0.1～2 part of flow agent, 3～10 parts of directed auxiliary agents, 1～5 part of anti-settling auxiliary agent, 20～40 parts of organic solvents.
Described polyester modification resin is epoxy modified polyester resin, acrylic acid modified polyester resin or organosilicon modified polyester resin.
Described aminoresin is the methyl-etherified melamine resin.
Described dead front type aliphatic polymeric isocyanate is that NCO content is the dead front type aliphatic polymeric isocyanate of 10.7wt%～11.7wt%; Described functional resin is a cellaburate.
Described rheology control resin is the sag prevention resin that contains the urea key of carboxylic acid amide esters type.
Described tinting pigment is all kinds of conventional pigment dyestuffs or mineral dye; Effect pigment is pearlescence or metallic aluminium powder; Filler is a nano barium sulfate.
Described smooth stabilization aid comprises ultraviolet absorbers and hindered amine light stabilizer, and the weight part of ultraviolet absorbers is 1～5 part, and the weight part of hindered amine light stabilizer is 1～3 part.
Described dispersion agent is the high molecular weight block copolymer that contains the pigment affinity groups, and flow agent is fluorine-carbon modified acrylate copolymer flow agent, and directed auxiliary agent is a cellulose acetate-butyrate, and the anti-settling auxiliary agent is a modification amides anti-settling high effective additives.
Described organic solvent is a kind of organic solvent in ester class, ketone, aliphatic hydrocarbon, Fatty Alcohol(C12-C14 and C12-C18), the aromatic hydrocarbon solvent or two kinds, three kinds or four kinds of formed mixed organic solvents systems of organic solvent wherein.
A kind of be used for metalwork exempt to be coated with basecoat, its preparation method may further comprise the steps:
1. take by weighing respectively be used for metalwork exempt from that to be coated with the corresponding raw material of component of each weight part of basecoat as follows: 26～35 parts of polyester modification resins, 7～10 parts in aminoresin, 3～8 parts of dead front type aliphatic polymeric isocyanates, 4～10 parts of functional resins, 8～15 parts of rheology control resins, 1～6 part of tinting pigment, 0.5～8 part of effect pigment, 3～10 parts of fillers, 2～5 parts of 2～8 parts of dispersion agents of light stabilization aid, 0.1～2 part of flow agent, 3～10 parts of directed auxiliary agents, 1～5 part of anti-settling auxiliary agent, 20～40 parts of organic solvents.
2. the tinting pigment that 1. step is taken by weighing all, polyester modification resin total amount 1/2～2/3, aminoresin all, whole, the functional resin of dead front type aliphatic polymeric isocyanate all, the rheology control resin all, the dispersion agent total amount 1/2～2/3,1/2～2/3 the stirring after mixing of solvent total amount, in grinding plant, be dispersed to fineness below 10 μ m and form the tinting pigment mill base.
3. whole, the filler of the effect pigment that 1. step is taken by weighing all, the light stabilization aid all, the remainder of dispersion agent total amount, whole, the directed auxiliary agents of flow agent all, the anti-settling auxiliary agent all, the remainders of solvent total amount mix the back and stir and be uniformly dispersed and obtain the effect pigment mill base; Described effect pigment is aluminium powder or pearlescence.
4. the remainder of polyester modification resin is added in the paint still, add the effect pigment mill base that 3. tinting pigment mill base that 2. step obtained and step are obtained while stirring, be stirred well to after adding and mix; If the color of material reached requirement and then obtained finished product this moment, then do not carry out step 5. if also reach requirement; Whether described color reaches requirement, is meant that color is the color of corresponding standard look or client's regulation.
5. add toner pigment in step material 4., the fine setting color is to the color of corresponding standard look or client's regulation; Described toner pigment is with the tinting pigment of step in 1., or the tinting pigment of other colors is dispersed to fineness below 10 μ m and obtain in grinding plant.
The present invention has positive effect: (1) of the present invention be used for metalwork exempt to be coated with the function that basecoat has floating coat lacquer and metal bottom colored paint concurrently, have excellent ornamental, weathering resistance, anti-hitting property of stone, profile pattern, and and the electrophoretic primer layer between strong adhesion.(2) when the roughness on ground and electrodeposited paint film surface is controlled at 0.2 μ m～0.35 μ m, use of the present invention be used for metalwork exempt to be coated with basecoat, adopt two coatings (base coat, coating varnish) technology can reach the effect of three coatings (in be coated with, base coat, coating varnish) coating process.
Embodiment
Below in conjunction with embodiment, details are as follows to the specific embodiment of the present invention:
(embodiment 1, be used for metalwork exempt to be coated with basecoat)
Be coated with basecoat (hereinafter to be referred as base coat) in the exempting from of present embodiment and be the dispersed system of pulpous state, form by the component of following weight part:
28 parts of polyester modification resins, 8 parts in aminoresin, 3 parts of dead front type aliphatic polymeric isocyanates, 5 parts of functional resins, 1 part of effect pigment, 10 parts of rheology control resins, 2 parts of tinting pigments, 3.9 parts of fillers, 3 parts of light stabilization aids, 3 parts of dispersion agents, 0.1 part of flow agent, 4 parts of directed auxiliary agents, 2 parts of anti-settling auxiliary agents, 27 parts of organic solvents, micro-toner pigment.
The source of each component in the dispersed system of above-mentioned pulpous state is as follows:
Described polyester modification resin is process epoxy, vinylformic acid or organic-silicon-modified vibrin, present embodiment is an acrylic acid modified polyester resin, the commercial disignation that derives from the sale of the special company of U.S.'s cyanogen is the transparent liquid acrylic acid modified polyester resin of AN950-70X, as the main base-material that is coated with basecoat in exempting from, it has excellent weathering resistance, gloss retention and resistance to chalking; In its ester segment, contain differential responses activity hydroxy group, these have and adhere to active group more by force and can drive adsorbed all gases molecule and water molecules in the micropore on the electrophoretic primer layer, and occupy micropore, by the effect of Van der Waals force the electrophoretic primer layer there is stronger sticking power; Also exist greatly sterically hindered in the polyester modification resin and do not contain the monomer of α-H, stoped the hydrolysis of ester chain, reduce the formation of free radical, thereby improve the stability of polyester.
The commercial disignation that described aminoresin derives from the sale of the special company of U.S.'s cyanogen is the transparent liquid methyl-etherified melamine resin of R-747, as linking agent, its reactive group content height, compare with the butyl ether trimeric cyanamide, little from the polycondensation tendency, can be effectively and the polyester modification resin reaction, form high crosslink density network structure coating, increase the weathering resistance and the primary colours fillibility of basecoat itself.
The commercial disignation that described dead front type aliphatic polymeric isocyanate derives from the sale of Sweden Paasche holder company is the transparent liquid dead front type aliphatic polymeric isocyanate of D2, as auxiliary crosslinking agent, its NCO content is 10. 7 wt%～11.7wt%, with polyester modification resin crosslinks film-forming, hard, soft chain segment rational proportion in this system are guaranteeing to have excellent flexibility under the hardness of paint film, well-tolerated stone hits energy, has increased anti-hitting property of stone; Contain stronger polar group in this linking agent simultaneously, they can form stronger bonding force with electrophoretic layer surface polarity group; Can form bigger closely knit macromolecular network structure, can make over-all properties more excellent, and excellent weathering resistance is arranged.
The commercial disignation that described functional resin derives from the sale of U.S. Eastman Chemical Co., Ltd. is the white powdery cellulose acetate butyrate of CAB381-0.2, and it is a kind of high butyryl radicals content, the cellulose ester of relatively low molecular weight.It and linking agent methyl-etherified melamine resin have good compatibility, can reduce surface viscosity, pimple during use, reduce shrinkage cavity, improve the coating flowability and heat levelling property again, and ply adhesion and anti-uv-ray are provided.Anti-uv-ray is a measurement index of the outdoor weatherability of coating, the outdoor weatherability of coating is meant the performance that can resist the various variations that external environment causes when coating is exposed to the open air, and these variations comprise loss, fragility, the variable color of change, the temperature of modulus, loss, efflorescence, loss of gloss and the environmental corrosion etc. of sticking power.
The commercial disignation that described effect pigment derives from the Iniodin series that German Eckart company sells is 9103 pearlescence (also can select metallic effect pigments such as metallic aluminium powder for use in other embodiments), this pearly pigment pearlescence is arranged at electrophoretic primer surface energy parallel orientation, can the antireflection part visible light.
The commercial disignation that described rheology control resin derives from the sale of Sweden Akzo Nobel N.V. is the sag prevention resin of the white emulsus carboxylic acid amide esters type of Seal9017355-50, this rheology control resin contains the urea key of some amount, be dispersed in the medium (resin or solvent), because there is hydrogen bond in the rheology control interlaminar resin, in coating, form a kind of loose three-dimensional net structure, as shown in the formula:
This three-dimensional net structure causes the rising of the static viscosity of coating, and shear under (spraying) effect at intensive, this three-dimensional net structure is destroyed, dope viscosity descends rapidly, thereby makes coating have rheological, and network is after destruction, again the speed of Hui Fuing is very fast, can return to static viscosity rapidly in behind coating application, dodging between dry spell, thereby can satisfy thicker filming and have better levelling property and the needs of sagging not, thereby improve smooth coating degree, fullness ratio.
In addition, this rheology control resin can impel effect pigment to align in solidification process, stops sunlight to penetrate its coating better cataphoretic coating is damaged.
Described tinting pigment derives from the red pigment particle (can adopt all kinds of conventional pigment dyestuff or the mineral dyes that are used to allocate the coating of application steelwork in other embodiments) of the L3885 that Paliogen series commercial disignation that BASF AG sells is.
The commercial disignation that described fill source is sold in German Sha Haliben chemical company is the white powder nano barium sulfate of HU-D, and this nano barium sulfate is used to control the viscosity of paint, makes the product color light, stablizes.
The commercial disignation that described smooth stabilization aid derives from Switzerland's Ciba sale is the light stabilization aid of little yellow liquor shape of TINUVIN292 or TINUVIN1130, it is the light stabilization aid of TINUVIN292 that present embodiment is selected commercial disignation for use, this light stabilization aid is the auxiliary agent that comprises ultraviolet absorbers and two kinds of effective constituents of hindered amine light stabilizer, this light stabilization aid can be a heat energy with ultraviolet energy transformation, has further improved the weathering resistance of coating.In addition, be coated with basecoat in use in of the present invention the exempting from, need outside this enamelled coating, cover one deck varnish more usually, also add this light stabilization aid in the varnish that is covered and play and reduce ultraviolet destruction.Its mechanism is as follows:
The mechanism of action of the ultraviolet absorbers in the light stabilization aid is represented with following formula: A
A
A
A+heat
Total reaction: radiation
Heat
A in the following formula represents ultraviolet absorbers, symbol " " expression free radical, and A just represents to have the ultraviolet absorbers of free radical.
The mechanism of action of the hindered amine light stabilizer in the light stabilization aid is represented with following formula:
P
?P·
P·+B
?P+?B·
B
The B+ heat
Total reaction: radiation
Heat
Symbol P in the following formula then represents polymkeric substance, and P represents to have the polymkeric substance of free radical, and B represents hindered amine light stabilizer, and B represents to have the hindered amine light stabilizer of free radical.
After basecoat of the present invention cooperates electrophoretic primer and finish paint to be used for metalwork, ultraviolet absorbers in the clear coat of the top coat layer of the coating on the metalwork can only absorption portion ultraviolet ray and be translated into less heat of injury and discharging, therefore remaining ultraviolet penetrable clear coat, cause the resin degraded in the whole coating and produce a large amount of free groups, the existence meeting of these free groups produces polymeric resin macromole and destroys; And hindered amine light stabilizer as a kind of radical scavenger, can be caught the free group that resin is produced by destruction such as illumination, reduces destructiveness greatly.
Described dispersion agent is the high molecular weight block copolymer that contains the pigment affinity groups, and deriving from the commercial disignation that German Bi Ke chemical company sells is the transparent liquid sodium lauryl sulphate of Byk-163; This sodium lauryl sulphate makes the granules of pigments homodisperse, prevents the sedimentation and the cohesion of granules of pigments simultaneously.
The commercial disignation that described flow agent derives from Switzerland's Ciba sale is EFKA-3777, the fluorine-carbon modified acrylate copolymer of employing that is transparent liquid, this flow agent has improved the levelling property of base coat on cataphoretic coating, increased its perviousness on the cataphoretic coating surface, thereby carry base coat sticking power, and it has good wettability this flow agent, good levelling property, and do not influence its reunion property again.
Described directed auxiliary agent derives from Japanese nanmu, and originally to change into the commercial disignation that Co., Ltd. sells be 4200-10(KK) the emulsus cellulose acetate-butyrate, this orientation auxiliary agent can prevent that aluminium powder or pearlescence from flowing, and guarantees the quality of final high flash coating in drenched filming.
Described anti-settling auxiliary agent derives from Japanese nanmu, and originally to change into the commercial disignation that Co., Ltd. sells be the emulsus modification amides anti-settling high effective additives of 6900-20x, and this anti-settling high effective additives prevents that in anti-settling color stuffing from generating precipitation in storage process.
Described organic solvent is commercially pure ester class, ketone, aliphatic hydrocarbon, Fatty Alcohol(C12-C14 and C12-C18), aromatic hydrocarbon solvent, as a kind of organic solvent (as propyl carbinol) in ethyl acetate, butylacetate, 1-Methoxy-2-propyl acetate, isophorone, propyl carbinol, isopropylcarbinol, dimethylbenzene, No. 100 solvent oils, No. 150 various organic solvents of solvent wet goods, or two kinds, three kinds or four kinds of organic solvents formed mixed organic solvents system in base coat in the above-mentioned various organic solvent.Present embodiment is propyl carbinol, dimethylbenzene, butylacetate and 1-Methoxy-2-propyl acetate, and four weight ratio is 1:3:5:1.
Described toner pigment is with above-mentioned tinting pigment, or the tinting pigment of other colors is dispersed to fineness below 10 μ m and obtain in grinding plant.
Each component interphase interaction of present embodiment in the paint film characteristic that guarantees traditional background color enamelled coating simultaneously, also possesses the various functions that substitute floating coat fully.According to the detection mode of standard GB/T13492-92 defined, be coated with basecoat in exempting from and be coated on the steelwork present embodiment is resulting, detect again after the oven dry.Detected result is:
Gloss (20 ℃ of Gloss) 〉=85GU; Anti-stone hits performance≤4 grade; Temperature tolerance: 240 hours≤1 grade; Salt fog resistance: be coated with face no change, secondary mechanical performance no change in 240 hours; Temper(ing): 1500 hours, 0; Other coating properties are the requirement by the GB/T13492-92 defined all.
(embodiment 2, exempt from be coated with basecoat)
The rest part that is coated with basecoat in the exempting from of present embodiment is identical with embodiment 1, difference is that its each component and by weight umber are as follows: 26 parts of polyester modification resins, 7 parts in aminoresin, 5 parts of dead front type aliphatic polymeric isocyanates, 8 parts of functional resins, 8 parts of rheology control resins, 3 parts of tinting pigments, 3 parts of the pearlescences of action effect pigment, 5 parts of fillers, 4 parts of light stabilization aids, 3 parts of dispersion agents, 0.3 part of flow agent, 4 parts of directed auxiliary agents, 3 parts of anti-settling auxiliary agents, 20.7 parts of organic solvents.
The component according to above-mentioned weight part of present embodiment is formed is coated with each component interphase interaction of basecoat in exempting from, and in the characteristic that guarantees traditional base coat paint film simultaneously, also possesses the various functions that substitute floating coat fully.According to the detection mode of standard GB/T13492-92 defined, be coated with basecoat in exempting from and be coated on the steelwork present embodiment is resulting, detect again after the oven dry.Detected result is:
Gloss (20 ℃ of Gloss) 〉=85GU; Anti-stone hits performance≤4 grade; 240 hours≤1 grade of temperature tolerance; Salt fog resistance: 240 hours, be coated with the face no change, secondary mechanical performance no change; Temper(ing): 1500 hours, 0; Other coating properties are the requirement by the GB/T13492-92 defined all.
(embodiment 3, be coated with the preparation method of basecoat in exempting from)
What present embodiment was prepared is to be coated with basecoat in embodiment 1 described the exempting from, and the preparation method may further comprise the steps:
1. take by weighing respectively with embodiment 1 described exempting to be coated with the corresponding raw material of component of each weight part of basecoat as follows: the polyester modification resin is 28 parts of acrylic acid modified polyester resins, aminoresin is 8 parts of methyl-etherified melamine resins, 3 parts of dead front type aliphatic polymeric isocyanates, 5 parts of functional resin cellulose acetate butyrates, 1 part of effect pigment pearlescence, 10 parts of rheology control resins, 2 parts of tinting pigments, 3.9 parts in filler nanometer barium sulfate, 3 parts of light stabilization aids, 3 parts of dispersion agent sodium lauryl sulphate, 0.1 part of flow agent, 4 parts of directed auxiliary agent cellulose acetate-butyrates, 2 parts of anti-settling auxiliary agents, weight ratio is the propyl carbinol of 1:3:5:1, dimethylbenzene, 27 parts of the mixed organic solvents that butylacetate and 1-Methoxy-2-propyl acetate are formed;
2. half of whole, the polyester modification resin total amount of the tinting pigment that 1. step is taken by weighing, aminoresin all, whole, the functional resin of dead front type aliphatic polymeric isocyanate all, half of whole, the dispersion agent total amount of rheology control resin, half of organic solvent total amount mix after adding in the mixing tank successively, mixture is dropped into to be dispersed to fineness in the grinding plant ball mill below 10 μ m and composition tinting pigment mill base again;
3. whole, the filler of the effect pigment that 1. step is taken by weighing all, whole, the remaining dispersion agents of light stabilization aid, whole, the directed auxiliary agents of flow agent all, whole, the remaining organic solvents of anti-settling auxiliary agent add successively and stir behind the mixing tank and be uniformly dispersed and obtain the effect pigment mill base;
4. remaining second half of polyester modification resin added in paint still, add the effect pigment mill base that 3. dispersible pigment color paste that 2. step obtained and step are obtained while stirring, be stirred well to after adding and mix; If this moment, the color of material reached the finished product of exempting to be coated with basecoat that requirement then obtains being used for metalwork, then do not carry out step 5. if also reach requirement; Whether described color reaches requirement, is meant whether color is the color of corresponding standard look or client's regulation.
5. add toner pigment in step material 4., the fine setting color is to the color of corresponding standard look or client's regulation; Described toner pigment is with the tinting pigment of step in 2., or the tinting pigment of other colors is dispersed to fineness below 10 μ m and obtain in ball mill.
To step 1. to 5. obtain exempt from be coated with the every performance index of basecoat and detect, when detecting the every performance index of basecoat, detection mode according to standard GB/T13492-92 defined, getting step 1. is coated with basecoat to 5. resulting the exempting from and is coated with in right amount, be overlying on the steelwork that sprays the electrophoretic primer layer, detect again after the oven dry; Detected result reaches gloss (20 ℃ of Gloss) 〉=85GU, and anti-stone hits performance≤4 grade, 240 hours≤1 grade of temperature tolerance, and salt fog resistance: 240 hours, be coated with the face no change, secondary mechanical performance no change, temper(ing): 1500 hours, 0; It is qualified to be considered as.
(embodiment 4, be coated with the preparation method of basecoat in exempting from)
What present embodiment was prepared is to be coated with basecoat in embodiment 2 described the exempting from, and all the other are identical with embodiment 3 for the preparation method, and difference is:
1. step takes by weighing, and to be coated with the corresponding raw material of component of each weight part of basecoat in exempting from as follows: the polyester modification resin is 26 parts of acrylic acid modified polyester resins, aminoresin is 7 parts of methyl-etherified melamine resins, 5 parts of dead front type aliphatic polymeric isocyanates, 8 parts of functional resin cellulose acetate butyrates, 3 parts of effect pigment pearlescences, 8 parts of rheology control resins, 3 parts of tinting pigments, 5 parts in filler nanometer barium sulfate, 4 parts of light stabilization aids, 3 parts of dispersion agent sodium lauryl sulphate, 0.3 part of flow agent, 4 parts of directed auxiliary agent cellulose acetate-butyrates, 3 parts of anti-settling auxiliary agents, weight ratio is the propyl carbinol of 1:3:5:1, dimethylbenzene, 20.7 parts of the mixed organic solvents that butylacetate and 1-Methoxy-2-propyl acetate are formed.
Step 2. in, whole, the polyester modification resin total amount of the tinting pigment that 1. step is taken by weighing 2/3, aminoresin all, whole, the functional resin of dead front type aliphatic polymeric isocyanate all, whole, the dispersion agent total amount of rheology control resin 2/3,2/3 the mixing after adding in the mixing tank successively of organic solvent total amount, mixture is dropped into be dispersed to fineness in the grinding plant ball mill below 10 μ m and composition tinting pigment mill base again.
Step 3. in, the effect pigment that 1. step takes by weighing is whole, filler all, whole, the remaining dispersion agents of light stabilization aid, whole, the directed auxiliary agents of flow agent all, whole, the remaining organic solvents of anti-settling auxiliary agent add successively and stir behind the mixing tank and be uniformly dispersed and obtain the effect pigment mill base.
Step 4. in, remaining polyester modification resin is added in the paint still, add the effect pigment mill base that 3. dispersible pigment color paste that 2. step obtained and step are obtained while stirring, be stirred well to after adding and mix.
(application examples, be coated with the using method of basecoat in exempting from)
Use in the spraying when being coated with basecoat in the exempting from of embodiment 1, may further comprise the steps: 1. coat with lacquer front surface and handle, surface of steel workpiece is carried out skimming treatment, reach the state that moisture film is continuous and turn linked to, again surface of steel workpiece is carried out bonderizing, 35 ℃ of control flume liquid temps sprayed 2 minutes; 2. ability cathode electrophoresis is done 160 ℃ of sudden strains of a muscle in following 2 minutes, and the control tank liquor temperature is 28 ℃ when wherein carrying out ability cathode electrophoresis, 2 minutes time, voltage 220V; 3. spray embodiment 1 described basecoat, dried in 3 to 5 minutes under the room temperature; 4. spray the solvent-borne type coating varnish, 140 ℃ of oven dry in following 20 minutes.5. inspection and evaluation, smooth smooth, inloading part.Wherein, also added the light stabilization aid in the coating varnish that 4. step sprays.
Claims (10)
- One kind be used for metalwork exempt to be coated with basecoat, it is characterized in that comprising the component of following weight part: 26～35 parts of polyester modification resins, 7～10 parts in aminoresin, 3～8 parts of dead front type aliphatic polymeric isocyanates, 4～10 parts of functional resins, 8～15 parts of rheology control resins, 1～6 part of tinting pigment, 0.5～8 part of effect pigment, 3～10 parts of fillers, 2～5 parts of 2～8 parts of dispersion agents of light stabilization aid, 0.1～2 part of flow agent, 3～10 parts of directed auxiliary agents, 1～5 part of anti-settling auxiliary agent, 20～40 parts of organic solvents.
- 2. according to claim 1 be used for metalwork exempt to be coated with basecoat, it is characterized in that: described polyester modification resin is epoxy modified polyester resin, acrylic acid modified polyester resin or organosilicon modified polyester resin.
- 3. according to claim 1 be used for metalwork exempt to be coated with basecoat, it is characterized in that: described aminoresin is the methyl-etherified melamine resin.
- 4. according to claim 1 be used for metalwork exempt to be coated with basecoat, it is characterized in that: described dead front type aliphatic polymeric isocyanate is that NCO content is the dead front type aliphatic polymeric isocyanate of 10.7wt%～11.7wt%; Described functional resin is a cellaburate.
- 5. according to claim 1 be used for metalwork exempt to be coated with basecoat, it is characterized in that: described rheology control resin is the sag prevention resin that contains the urea key of carboxylic acid amide esters type.
- 6. according to claim 1 be used for metalwork exempt to be coated with basecoat, it is characterized in that: described tinting pigment is all kinds of conventional pigment dyestuffs or mineral dye; Effect pigment is pearlescence or metallic aluminium powder; Filler is a nano barium sulfate.
- 7. according to claim 1 be used for metalwork exempt to be coated with basecoat, it is characterized in that: described smooth stabilization aid comprises ultraviolet absorbers and hindered amine light stabilizer, the weight part of ultraviolet absorbers is 1～5 part, and the weight part of hindered amine light stabilizer is 1～3 part.
- 8. according to claim 1 be used for metalwork exempt to be coated with basecoat, it is characterized in that: described dispersion agent is the high molecular weight block copolymer that contains the pigment affinity groups, flow agent is fluorine-carbon modified acrylate copolymer flow agent, directed auxiliary agent is a cellulose acetate-butyrate, and the anti-settling auxiliary agent is a modification amides anti-settling high effective additives.
- 9. according to claim 1 be used for metalwork exempt to be coated with basecoat, it is characterized in that: described organic solvent is a kind of organic solvent in ester class, ketone, aliphatic hydrocarbon, Fatty Alcohol(C12-C14 and C12-C18), the aromatic hydrocarbon solvent or two kinds, three kinds or four kinds of formed mixed organic solvents systems of organic solvent wherein.
- One kind as one of claim 1 to 9 described be used for metalwork exempt to be coated with basecoat, its preparation method may further comprise the steps:1. take by weighing respectively be used for metalwork exempt from that to be coated with the corresponding various raw materials of component of each weight part of basecoat as follows: 26～35 parts of polyester modification resins, 7～10 parts in aminoresin, 3～8 parts of dead front type aliphatic polymeric isocyanates, 4～10 parts of functional resins, 8～15 parts of rheology control resins, 1～6 part of tinting pigment, 0.5～8 part of effect pigment, 3～10 parts of fillers, 2～5 parts of 2～8 parts of dispersion agents of light stabilization aid, 0.1～2 part of flow agent, 3～10 parts of directed auxiliary agents, 1～5 part of anti-settling auxiliary agent, 20～40 parts of organic solvents;2. the tinting pigment that 1. step is taken by weighing all, polyester modification resin total amount 1/2～2/3, aminoresin all, whole, the functional resin of dead front type aliphatic polymeric isocyanate all, the rheology control resin all, the dispersion agent total amount 1/2～2/3,1/2～2/3 the stirring after mixing of solvent total amount, in grinding plant, be dispersed to fineness below 10 μ m and form the tinting pigment mill base;3. whole, the filler of the effect pigment that 1. step is taken by weighing all, the light stabilization aid all, the remainder of dispersion agent total amount, whole, the directed auxiliary agents of flow agent all, the anti-settling auxiliary agent all, the remainders of solvent total amount mix the back and stir and be uniformly dispersed and obtain the effect pigment mill base; Described effect pigment is aluminium powder or pearlescence;4. the remainder of polyester modification resin is added in the paint still, add the effect pigment mill base that 3. tinting pigment mill base that 2. step obtained and step are obtained while stirring, be stirred well to after adding and mix; If the color of material reached requirement and then obtained finished product this moment, then do not carry out step 5. if also reach requirement; Whether described color reaches requirement, is meant that color is the color of corresponding standard look or client's regulation;5. add toner pigment in step material 4., the fine setting color is to the color of corresponding standard look or client's regulation; Described toner pigment is with the tinting pigment of step in 1., or the tinting pigment of other colors is dispersed to fineness below 10 μ m and obtain in grinding plant.
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| CN102220074A (en) * | 2011-04-21 | 2011-10-19 | 广东同步化工股份有限公司 | Sagging and blistering preventing overcoat varnish for automobile coating as well as preparation method and coating method thereof |
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| CN102757703A (en) * | 2012-08-10 | 2012-10-31 | 漳州鑫展旺化工有限公司 | Automobile intermediate coat capable of improving coating efficiency remarkably and preparation method thereof |
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| CN103059673A (en) * | 2012-12-27 | 2013-04-24 | 王娟 | Sparkling metallic paint |
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| CN106752958A (en) * | 2016-12-02 | 2017-05-31 | 安徽汇泰车轮有限公司 | A kind of automobile metal flash of light background color coating |
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