Summary of the invention
The invention provides a kind of low pollution, safe, the water soluble paint and the spraying method thereof that can be used for the spraying of automotive oil tank, component.The raw materials by weight portion meter of water soluble paint provided by the present invention comprises:
80~90 parts of water soluble acrylic resins
5~12 parts of solubility promoters
0.2~1 part of flow agent
0.1~0.2 part of thickening material
Gained water soluble paint regulates pH value 8.0~8.4, solid granularity≤50 μ m with organic amine or ammoniacal liquor.
Further, for strengthening the water-soluble of water soluble acrylic resin, described water soluble acrylic resin introduces hydrophilic radical.
As preferably, be the hardness of paint film that strengthens gained coating, gained water soluble paint regulates amino resin crosslinked the obtaining of methyl-etherified that adds again water soluble acrylic resin's weight 5%~20% after pH value 8.0~8.4 with organic amine or ammoniacal liquor.
Following a~c is further explanation to solubility promoter, flow agent, thickening material in above-mentioned water soluble paint and preferably.In the time adopting any one in following a~c or multinomial optimization in above-mentioned water soluble paint, gained water soluble paint performance meets in " automotive paints coating " QC/T484-1999 for automotive oil tank, component that coating requires or is better.
A, add solubility promoter, can play improve resin and water mutual solubility, regulate viscosity, make resin solution stablize and improve the effect of film levelling property and outward appearance.Particularly, when resin is in wetting ability deficiency, while being full-bodied starchiness after resin dissolves, the conventional solubility promoter of transparent resin solution that adds solubility promoter just can become favorable solubility comprises that alcohols, alcohol ether organic solvent all can well be applicable to the present invention.Concrete, the mixture of one or more in coating of the present invention in the preferred ethylene glycol monobutyl ether of solubility promoter, ethylene glycol ethyl ether, propylene-glycol ethyl ether, propandiol butyl ether, sec-butyl alcohol, Virahol; More optimizedly ethylene glycol monobutyl ether.
B, described flow agent are acrylic copolymer 30%~50%, the compound of a contracting propylene glycol monomethyl ether 50%~70%, preferably DEUCHEM Levaslip455 acrylic copolymer solution.
C, described thickening material are non-ionic polyurethane associative thickener; The WT-105A association type polyurethane thickener that preferably moral modest (Shanghai) Chemical Co., Ltd. sells.
For extending the storage time of water-borne coatings, in above-mentioned water-borne coatings, can add the mould inhibitor of 0.05~0.2 part of parts by weight.The concrete preferably isothiazolinone compounds of mould inhibitor; China Tech 981 mould inhibitors that specifically can select Shanxi Petro-Chemical Design Inst. to sell.
The coating of standing storage is to guarantee that solid content wherein remains in 40%~60% scope, does not affect coating quality, and the water that can also add 0.05~0.2 part of parts by weight in above-mentioned water soluble paint is to maintain the solid content of coating of standing storage.
Concrete, in above-mentioned water soluble paint, also comprise the mill base of 8~10 parts of parts by weight.
Concrete, above-mentioned mill base is counted by weight, comprises following raw materials according:
50~65 parts of water soluble acrylic resins
6~8 parts of pigment
0.5~1 part of dispersion agent
0.1~1 part of defoamer
20~28 parts, water
Gained mill base regulates pH value 8.0~8.4, solid granularity≤15 μ m with organic amine or ammoniacal liquor.
In mill base water soluble acrylic resin and other raw materials in coating water-soluble, film forming properties is consistent.
Further, for strengthening the water-soluble of water soluble acrylic resin, the water soluble acrylic resin in described mill base introduces hydrophilic radical.
Following I-III is further explanation to pigment, dispersion agent, defoamer in above-mentioned mill base and specifically preferred.When above-mentioned mill base adopts any one in following I-III or multinomial when preferred, gained mill base also can meet the requirement of coating of the present invention to mill base.
Pigment described in I in mill base can be selected the conventional pigment in this area, in the time being applied to automotive oil tank and component spraying, and based on market requirement reason, preferably carbon black.
Dispersion agent described in II in mill base is poly-hydroxy acid salt dispersion agent, the NUOSPERSE FX600 dispersion agent that preferably moral modest (Shanghai) Chemical Co., Ltd. sells.
Defoamer described in III in mill base is polysiloxane defoamers, the BYK-026 defoamer that preferred German Bi Ke chemical company sells.
For avoiding polluting, extend storage time of coating, the preferred distilled water of water or deionized water used in mill base and water soluble paint.The electric conductivity of water is higher, is more beneficial to the storage of coating.
After in the present invention, mill base is mixed in proportion, the granularity that solid particulate is finely ground to requirement obtains described mill base.After the raw material of water soluble paint is mixed in proportion, the granularity that solid particulate is finely ground to requirement obtains described water soluble paint.The fine grinding of mill base and water soluble paint can adopt the ordinary method of this area and equipment to grind.In addition, the present invention also provides the application of above-mentioned water soluble paint in automotive oil tank, component spraying.
The spraying method of the water soluble paint described in the present invention comprises the following steps:
A, surface treatment: automotive oil tank to be sprayed and component are carried out to clean surface processing before spraying water-borne coatings;
B, with distilled water or clean water, water-borne coatings is adjusted to the viscosity of suitable spraying, measures with coating-4 viscosity meter, the viscosity of described suitable spraying is 18~32 seconds;
C, control spray gun air pressure 0.3-0.4MPa, the distance of nozzle and original paper to be sprayed is that 26mm~420mm sprays;
Wherein, described surface treatment comprises rust cleaning, washing, oil removing, phosphatization or silane treatment, passivation, airtight test, baking step; In step c when spraying, is controlled 12~32 ℃ of the temperature of paint spray booth, relative humidity 35%~70%.
Water soluble paint of the present invention is compared with equal coating of the prior art, in coating raw material, do not need to add inorganic particle, and equal coating of the prior art to solid particulate granularity requirements in water soluble paint far above water soluble paint of the present invention to solid particulate granularity in water soluble paint.In coating cost savings and on to the requirement of fine grinding machinery, water soluble paint of the present invention has had significant progress.
Water soluble paint of the present invention is compared solvent based coating environmental protection more, low volatilization; Can replace solvent based coating spray car fuel tank, component, reach " automotive paints coating " QC/T484-1999 standard; Reduce in spraying application process harm, the environmental pollution to human body less.
Embodiment
Below by embodiment, the present invention is further described.
The raw materials by weight portion meter of water soluble paint provided by the present invention comprises:
80~90 parts of water soluble acrylic resins
5~12 parts of solubility promoters
0.2~1 part of flow agent
0.1~0.2 part of thickening material
Gained water soluble paint regulates pH value 8.0~8.4, solid granularity≤50 μ m with organic amine or ammoniacal liquor.
Further, the water soluble acrylic resin in the film-forming resin in film-forming resin and mill base introduces hydrophilic radical increases the water-soluble of water soluble acrylic resin, reduces the consumption of solubility promoter.
As preferably, be the hardness of paint film that strengthens gained coating, gained water soluble paint regulates amino resin crosslinked the obtaining of methyl-etherified that adds again water soluble acrylic resin's weight 5%~20% after pH value 8.0~8.4 with organic amine or ammoniacal liquor.
Following a~c is further explanation to solubility promoter, flow agent, thickening material in above-mentioned water soluble paint and preferably.In the time adopting any one in following a~c or multinomial optimization in above-mentioned water soluble paint, gained water soluble paint performance meets in " automotive paints coating " QC/T484-1999 for automotive oil tank, component that coating requires or is better.
A, add solubility promoter, can play improve resin and water mutual solubility, regulate viscosity, make resin solution stablize and improve the effect of film levelling property and outward appearance.Particularly, when resin is in wetting ability deficiency, while being full-bodied starchiness after resin dissolves, the conventional solubility promoter of transparent resin solution that adds solubility promoter just can become favorable solubility comprises that alcohols, alcohol ether organic solvent all can well be applicable to the present invention.Concrete, the mixture of one or more in coating of the present invention in the preferred ethylene glycol monobutyl ether of solubility promoter, ethylene glycol ethyl ether, propylene-glycol ethyl ether, propandiol butyl ether, sec-butyl alcohol, Virahol; More optimizedly ethylene glycol monobutyl ether.
B, described flow agent are acrylic copolymer 30%~50%, the compound of a contracting propylene glycol monomethyl ether 50%~70%, preferably DEUCHEM Levaslip455 acrylic copolymer solution.
C, described thickening material are non-ionic polyurethane associative thickener; The WT-105A association type polyurethane thickener that preferably moral modest (Shanghai) Chemical Co., Ltd. sells.
For extending the storage time of water-borne coatings, in above-mentioned water-borne coatings, can add the mould inhibitor of 0.05~0.2 part of parts by weight.The concrete preferably isothiazolinone compounds of mould inhibitor; China Tech 981 mould inhibitors that specifically can select Shanxi Petro-Chemical Design Inst. to sell.
The coating of standing storage is to guarantee that solid content wherein remains in 40%~60% scope, does not affect coating quality, and the water that can also add 0.05~0.2 part of parts by weight in above-mentioned water soluble paint is to maintain the solid content of coating of standing storage.
Concrete, in above-mentioned water soluble paint, also comprise the mill base of 8~10 parts of parts by weight.
Concrete, above-mentioned mill base is counted by weight, is made up of following raw materials according:
50~65 parts of water soluble acrylic resins
6~8 parts of pigment
0.5~1 part of dispersion agent
0.1~1 part of defoamer
20~28 parts, water
Gained mill base regulates pH value 8.0~8.4, solid granularity≤15 μ m with organic amine or ammoniacal liquor.
Mill base and other compositions in coating water-soluble, film forming properties is consistent.
Further, for strengthening the water-soluble of water soluble acrylic resin, the water soluble acrylic resin in described mill base introduces hydrophilic radical.
Following I-III is further explanation to pigment, dispersion agent, defoamer in above-mentioned mill base and specifically preferred.When above-mentioned mill base adopts any one in following I-III or multinomial when preferred, gained mill base also can meet the requirement of coating of the present invention to mill base.
Pigment described in I in mill base can be selected the conventional pigment in this area, in the time being applied to automotive oil tank and component spraying, and based on market requirement reason, preferably carbon black.
Dispersion agent described in II in mill base is poly-hydroxy acid salt dispersion agent, the NUOSPERSE FX600 dispersion agent that preferably moral modest (Shanghai) Chemical Co., Ltd. sells.
Defoamer described in III in mill base is polysiloxane defoamers, the BYK-026 defoamer that preferred German Bi Ke chemical company sells.
For avoiding polluting, extend storage time of coating, the preferred distilled water of water or deionized water used in mill base and water soluble paint.The electric conductivity of water is higher, is more beneficial to the storage of coating.
After in the present invention, mill base is mixed in proportion, the granularity that solid particulate is finely ground to requirement obtains described mill base.After the raw material of water soluble paint is mixed in proportion, the granularity that solid particulate is finely ground to requirement obtains described water soluble paint.The fine grinding of mill base and water soluble paint can adopt the ordinary method of this area and equipment to grind.In addition, the present invention also provides the application of above-mentioned water soluble paint in automotive oil tank, component spraying.
The spraying method of the water soluble paint described in the present invention comprises the following steps:
A, surface treatment: automotive oil tank to be sprayed and component are carried out to clean surface processing before spraying water-borne coatings;
B, with distilled water or clean water, water-borne coatings is adjusted to the viscosity of suitable spraying, measures with coating-4 viscosity meter, the viscosity of described suitable spraying is 18~32 seconds;
C, control spray gun air pressure 0.3-0.4MPa, the distance of nozzle and original paper to be sprayed is that 26mm~420mm sprays;
Wherein, described surface treatment comprises rust cleaning, washing, oil removing, phosphatization or silane treatment, passivation, airtight test, baking step; In step c when spraying, is controlled 12~32 ℃ of the temperature of paint spray booth, relative humidity 35%~70%.
In spraying operation, should be noted following main points:
(1), spray gun can be done up and down, move left and right, spray angle is take vertical with working-surface as principle, and according to complexity conversion angle of gun and the travelling speed of working face, there is position, dead angle, spray gun should be shifted near to spraying point and carry out suitable interrupted spraying, make every effort to reach uniform coating thickness.In the time being sprayed onto working face two ends, the hand of button spray gun trigger rapidly pine, reduces coating cloud once, because more than twice spraying is often wanted at the two ends of working face, is the place of the most easily causing sagging.
(2), spraying time will descend one coating to push down 1/3 or 1/4 of one coating, avoids occurring drain spray phenomenon.Before the coating having sprayed is dry, need once to have sprayed in order.The effect that fills spray is undesirable.
(3), spraying order be: difficult at first and quite easy afterwards, from inside outwards.Lower after first eminence, big area after first small area.So just can not cause the coating cloud of rear spray to be splashed on the paint film having sprayed, destroy the paint film having sprayed.
Embodiment
Below in conjunction with embodiment, the present invention is further described.But therefore protection scope of the present invention is not limited among scope of embodiments.
Table 1 auxiliary agent is selected
Auxiliary agent title |
Brand and model |
Source |
Flow agent |
DEUCHEM?Levaslip455 |
Moral modest (Shanghai) Chemical Co., Ltd. |
Thickening material |
WT-105A |
Moral modest (Shanghai) Chemical Co., Ltd. |
Dispersion agent |
NUOSPERSE?FX600 |
Moral modest (Shanghai) Chemical Co., Ltd. |
Defoamer |
BYK-026 |
Bi Ke chemical company of Germany |
Mould inhibitor |
China Tech 981 |
Shanxi Petro-Chemical Design Inst. |
Table 2 mill base raw material
After raw material in table 2 is mixed respectively in proportion, regulate pH to 8.0-8.4 respectively with dimethylethanolamine, fine grinding obtains mill base 1, mill base 2, mill base 3, mill base 4, mill base 5; And be applied to respectively in the preparation of water soluble paint embodiment 1, embodiment 2 in table 3, embodiment 3, embodiment 4, embodiment 5.
Table 3 water soluble paint raw material
After embodiment 1, embodiment 2, embodiment 3 press table 3 raw material and mix respectively in proportion, add dimethylethanolamine to regulate fine grinding after pH to 8.0-8.4 to obtain water soluble paint.After embodiment 4, embodiment 5 are mixed in proportion water soluble acrylic resin, mill base, ethylene glycol monobutyl ether, DEUCHEM Levaslip455, the modest WT105A of moral, China Tech 981, distilled water, after adding dimethylethanolamine to regulate to add methyl-etherified amino resin crosslinked after pH to 8.0-8.4, fine grinding obtains water soluble paint again.After the water soluble paint that embodiment is made sprays on automotive oil tank according to QC/T484-1999 method determination data as table 4:
Table 4 paint film property
As can be seen from Table 4, gained water soluble paint of the present invention can meet the requirement of automotive oil tank coating preferably, especially embodiment 4, embodiment 5, in the time obtaining film-forming resin with methyl-etherified is amino resin crosslinked, its hardness of paint film has obvious lifting, and hardness of paint film increases and improves with the consumption of methyl-etherified aminoresin.Simultaneously due to produce and use procedure in pollution and to the injury of human body much smaller than solvent based coating.