CN114410160A - Universal low-temperature water-based conductive primer for automobile parts and preparation method and application thereof - Google Patents
Universal low-temperature water-based conductive primer for automobile parts and preparation method and application thereof Download PDFInfo
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- CN114410160A CN114410160A CN202111273420.3A CN202111273420A CN114410160A CN 114410160 A CN114410160 A CN 114410160A CN 202111273420 A CN202111273420 A CN 202111273420A CN 114410160 A CN114410160 A CN 114410160A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 25
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000839 emulsion Substances 0.000 claims abstract description 20
- 229920003009 polyurethane dispersion Polymers 0.000 claims abstract description 14
- 239000004814 polyurethane Substances 0.000 claims abstract description 13
- 239000000049 pigment Substances 0.000 claims abstract description 12
- 239000000945 filler Substances 0.000 claims abstract description 11
- 229920002635 polyurethane Polymers 0.000 claims abstract description 11
- 229920000098 polyolefin Polymers 0.000 claims abstract description 10
- 229920003023 plastic Polymers 0.000 claims abstract description 9
- 239000004033 plastic Substances 0.000 claims abstract description 9
- 229920006942 ABS/PC Polymers 0.000 claims abstract description 6
- 238000007590 electrostatic spraying Methods 0.000 claims abstract description 6
- 229920001577 copolymer Polymers 0.000 claims abstract description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 239000006254 rheological additive Substances 0.000 claims description 14
- 239000004743 Polypropylene Substances 0.000 claims description 11
- 239000002002 slurry Substances 0.000 claims description 9
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 8
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 8
- 239000000440 bentonite Substances 0.000 claims description 8
- 229910000278 bentonite Inorganic materials 0.000 claims description 8
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 6
- -1 polypropylene Polymers 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000009736 wetting Methods 0.000 claims description 6
- 239000004952 Polyamide Substances 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229920002647 polyamide Polymers 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 239000004094 surface-active agent Substances 0.000 claims description 5
- 125000000129 anionic group Chemical group 0.000 claims description 4
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 4
- 239000004408 titanium dioxide Substances 0.000 claims description 4
- 239000005995 Aluminium silicate Substances 0.000 claims description 3
- 125000001931 aliphatic group Chemical group 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 235000012211 aluminium silicate Nutrition 0.000 claims description 3
- 229960000892 attapulgite Drugs 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 239000006184 cosolvent Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- 229910021485 fumed silica Inorganic materials 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 230000002209 hydrophobic effect Effects 0.000 claims description 3
- 239000003112 inhibitor Substances 0.000 claims description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052625 palygorskite Inorganic materials 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000002562 thickening agent Substances 0.000 claims description 3
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims description 3
- 230000000844 anti-bacterial effect Effects 0.000 claims description 2
- 239000002518 antifoaming agent Substances 0.000 claims description 2
- 239000003899 bactericide agent Substances 0.000 claims description 2
- 238000004132 cross linking Methods 0.000 claims description 2
- 239000002270 dispersing agent Substances 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 claims description 2
- 239000000454 talc Substances 0.000 claims description 2
- 235000012222 talc Nutrition 0.000 claims description 2
- 229910052623 talc Inorganic materials 0.000 claims description 2
- 229920002994 synthetic fiber Polymers 0.000 abstract description 4
- 239000002904 solvent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 9
- 239000002585 base Substances 0.000 description 8
- 230000001965 increasing effect Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 239000012855 volatile organic compound Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000000518 rheometry Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000013538 functional additive Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000017260 vegetative to reproductive phase transition of meristem Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- 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
- C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
- C09D123/26—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment
- C09D123/28—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment by reaction with halogens or compounds containing halogen
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/002—Priming paints
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a preparation method and application of a universal low-temperature water-based conductive primer for automobile parts, which is characterized by comprising the following components in parts by weight: 0-20 parts of acrylic emulsion; 0-20 parts of polyurethane acrylic hybrid copolymer; 0-20 parts of polyurethane dispersion; 10-40 parts of chlorinated polyolefin emulsion; 10-40 parts of acrylic acid modified chlorinated polyolefin emulsion; 10-40 parts of pure water; 0-20 parts of an auxiliary agent; 10-30 parts of pigment and filler. The formula of the invention hardly adds organic volatile solvent, and can be sprayed on automobile bumpers, PET/PBT, ABS/PC plastic parts, or used as single-component low-temperature water-based conductive primer for electrostatic spraying on SMC, EG + CF artificial synthetic materials and electrophoretic layers.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a universal low-temperature water-based conductive primer for automobile parts and a preparation method and application thereof.
Background
The waterborne nature of automotive part spray coatings has been a necessary trend with the rapid development of the global automotive industry and the push for low VOC coatings.
Compared with the traditional automobile interior and exterior trim part spraying primer of bumpers, spoilers, rearview mirrors, center control panels, door interior trim strips and the like of commercial and passenger automobiles, the product of the invention can reach the environmental protection requirement of extremely low VOC emission, even no VOC emission.
In addition, for the plastic mainly comprising polypropylene such as the bumper, the surface energy is extremely low, the coating is difficult to adhere, and the general oil-based coating is difficult to construct and meets the base materials of various performance indexes.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a low-temperature water-based conductive primer for automobile parts. The product of the invention can reach the environmental protection requirement of extremely low VOC emission and even no VOC emission. Aiming at the base materials which are difficult to construct and meet various performance indexes of common oil-based coatings, the invention can better adapt to the adhesion and the performance of various plastic and non-plastic base materials of automobile parts including bumpers.
The invention also aims to provide a preparation method of the universal low-temperature water-based conductive primer for the automobile parts.
The invention also aims to provide application of the low-temperature water-based conductive primer for the automobile parts.
The conductive coating is not limited to be used in plastic parts which are difficult to adhere, such as automobile bumpers and the like, and can also be used in conventional plastics, such as ABS/PC, PBT and the like, artificial synthetic materials, such as SMC, EG + CF and the like, and the application of the conductive coating as a conductive coating on an electrophoretic layer in electrostatic spraying.
In order to realize one of the purposes of the invention, the adopted technical scheme is as follows:
the general low-temperature water-based conductive primer for the automobile parts comprises the following components in parts by weight:
0-20 parts of acrylic emulsion (PA);
0-20 parts of polyurethane acrylic hybrid copolymer (PUA);
0-20 parts of polyurethane dispersion (PUD);
10-40 parts of chlorinated polyolefin emulsion (POEM);
10-40 parts of acrylic acid modified chlorinated polyolefin emulsion (POA);
10-40 parts of pure water (DIW);
0-20 parts of an auxiliary agent;
10-30 parts of pigment and filler.
In a preferred embodiment of the present invention, the acrylic emulsion is an anionic self-crosslinking emulsion.
In a preferred embodiment of the present invention, the polyurethane acrylic hybrid copolymer is an aliphatic polyurethane acrylic hybrid, and low-temperature film formation is achieved by the aliphatic polyurethane acrylic hybrid.
In a preferred embodiment of the invention, the polyurethane dispersion is an anionic polyurethane dispersion, which is self-drying at low temperature.
In a preferred embodiment of the present invention, the chlorinated polyolefin emulsion is a chlorinated polypropylene emulsion. The chlorinated polypropylene emulsion does not contain VOC.
In a preferred embodiment of the present invention, the acrylic modified chlorinated polyolefin emulsion is a self-emulsifying acrylic modified chlorinated polypropylene, which is well diluted with water and free of VOCs.
In a preferred embodiment of the present invention, the pigment and filler is any one or more of titanium dioxide, talc, conductive carbon black, fumed silica, magnesium aluminum silicate, bentonite, barium sulfate, aluminum tripolyphosphate, diatomite, kaolin and calcium carbonate. Preferably 0.2 to 2 parts of conductive carbon black. More preferably 1.6 parts.
In a preferred embodiment of the present invention, the auxiliary agent comprises any one or more of a surfactant, a bactericide, a rheology auxiliary agent, a PH adjuster, a film forming auxiliary agent, a cosolvent, a thickener, an anti-salt spray auxiliary agent, or a hydrophobic auxiliary agent.
The surfactant is any one or more of a wetting leveling agent, a wetting dispersing agent, a defoaming agent, a foam inhibitor or a color floating inhibitor.
The rheological additive is an organic or inorganic rheological additive, and the organic rheological additive is any one or more of polyurethane association type, alkali dissolution and expansion type, polyamide wax or EVA wax type rheological additive;
the inorganic rheological additive is one or more of magnesium aluminum silicate, talcum powder, gas-phase silicon dioxide, attapulgite or bentonite.
In order to achieve the second object, the invention adopts the following technical scheme:
a preparation method of a universal low-temperature water-based conductive primer for automobile parts comprises the following steps:
firstly, adding a proper amount of pure water and partial auxiliary agents in turn under low-speed stirring, adjusting the pH value to a set range, then adding one or more of PA/PUA/POA,
then stirring uniformly at medium speed, sequentially adding the pigment and filler, adjusting the viscosity to be suitable for high-speed dispersion for 30-60min by using pure water;
secondly, grinding the premixed slurry obtained in the first step to the fineness of 10 mu m, filtering out the ground slurry, and calculating the weight and the yield;
and thirdly, adding a proper amount of auxiliary agent and one or more of the POEM/PUD/PUA into the slurry obtained in the second step, adding the rest auxiliary agent, and adjusting the solid content, the viscosity and the pH value to be qualified to obtain the water-based conductive primer.
In a preferred embodiment of the present invention, the low speed is 100-300rpm, the medium speed is 500-800rpm, and the high speed is not lower than 800 rpm;
the pH value to a set range is 8-9.
In a preferred embodiment of the invention, the viscosities include a T-4 cup viscosity and a Blockfield viscosity of 100 and 200mPa/s at low shear (250 knife seconds) and 60 to 120mPa/s at high shear (2000 knife seconds).
The application of the low-temperature water-based conductive primer is to spray the low-temperature water-based conductive primer on automobile bumpers, PET/PBT and ABS/PC plastic parts or on SMC, EG + CF artificial synthetic materials and electrophoretic layers.
The invention has the beneficial effects that:
1. flame treatment is not needed for the base material of the bumper, and the construction VOC is less than or equal to 5 percent, so that the bumper is very environment-friendly;
2. the baking can be carried out at low temperature (80 ℃) and the performances of conventional water resistance, adhesive force and the like can be met without strengthening a curing agent;
3. the preparation process is relatively simple, the flexibility is high, special treatment (such as tightness, nitrogen protection, water bath, high pressure and the like) is not required, the process is not different from the traditional oily product production process, and the industrial mass production is very suitable;
4. the applicability of the base material is wide, the production efficiency of a single production line is extremely high, and a production line does not need to be changed; since the present invention is not limited to use in automobile bumpers, substrates common to automotive interior and exterior trim such as: the coating can be used for electrostatic spraying or non-electrostatic spraying on plastic parts such as PBT/PBT, ABS/PC and the like, and artificial synthetic materials such as SMC, EG + CF and the like, even on an electrophoretic layer.
Detailed Description
In order to illustrate the invention more clearly, the invention is further elucidated with reference to preferred embodiments. It will be apparent to those skilled in the art that the following detailed description is illustrative and not restrictive, and should not be taken as limiting the scope of the invention.
In the technical scheme, the construction of the adhesive (binder), the color filler combination and the auxiliary agent combination can be simplified.
Binder (binder) construction:
PA and PUA provide efficient pigment wetting, orientation, encapsulation, and adhesion to non-PP substrates; the PUD has the functions of improving the key mechanical properties of a paint film, such as flexibility, recoating, water resistance and the like, and the matching property with an upper coating and the like; the POA and the POEM are carriers for providing main adhesive force for PP-based base materials, and are key raw materials for resisting water and gasoline on the PP-based base materials;
combining pigments and fillers: the paint comprises titanium dioxide, talcum powder, conductive carbon black, fumed silica, magnesium aluminum silicate, bentonite, barium sulfate, aluminum tripolyphosphate, diatomite, kaolin, calcium carbonate and the like, and has the functions of providing conductivity, filling property, coloring property, enhancing covering capacity to a substrate, smooth surface and smooth surface.
Auxiliary agent combination: the water-based auxiliary agent comprises surface active agents, rheological agents, pH regulators, sterilization and mildew proofing agents, film forming auxiliary agents, salt spray resisting auxiliary agents, hydrophobic auxiliary agents and the like.
Surface active classes include reducing water-based surface tension, promoting wetting and leveling of substrates and surface spreading of coatings, promoting color and dispersion and stability in systems, preventing floating color and bloom, and including defoaming and foam suppressing effects on systems.
The rheological additive comprises organic and inorganic additives, such as polyurethane association type, alkali-soluble swelling type, polyamide wax, EVA wax type and the like, and inorganic additives such as magnesium aluminum silicate, talcum powder, gas-phase silicon dioxide, attapulgite, bentonite and the like, and the action result of the rheological additive is that the rheological additive has the characteristics of increasing rheological characteristics such as sagging resistance, sedimentation resistance (different application of soft sedimentation and hard sedimentation), construction spraying and flowering resistance, high-speed shearing resistance aiming at an electrostatic spraying rotary cup and the like no matter organic or inorganic, and the action principle of each rheological additive has the characteristics.
The film forming auxiliary agent, the PH regulator and the sterilization mildew preventive provide better workability, storage and stability for the paint; the functional additive such as salt-resistant fog agent, water repellent and the like has the same name and less addition, and has auxiliary effect on the whole performance.
The invention is described in more detail below with reference to several embodiments:
example 1
The preparation method of the universal low-temperature water-based conductive primer for the automobile parts comprises the following raw material formula in example 1 in table 1:
the preparation method specifically comprises the following preparation steps, wherein the specific proportion is shown in table 1:
firstly, adding a proper amount of pure water and partial auxiliary agents in turn under low-speed stirring, adjusting the pH value to a set range, then adding one or more of PA/PUA/POA,
then stirring uniformly at medium speed, sequentially adding the pigment and filler, adjusting the viscosity to be suitable for high-speed dispersion for 30-60min by using pure water;
secondly, grinding the premixed slurry obtained in the first step to the fineness of 10 mu m, filtering out the ground slurry, and calculating the weight and the yield;
and thirdly, adding a proper amount of auxiliary agent and one or more of the POEM/PUD/PUA into the slurry obtained in the second step, adding the rest auxiliary agent, and adjusting the solid content, the viscosity and the pH value to be qualified to obtain the water-based conductive primer.
Example 2
Relative to example 1, the PA was reduced to 5%, the POA was reduced to 5%, the polyamide wax among the rheology aids was reduced to 0.5%, the POEM was increased to 30%, the PUA was newly increased by 5% and the bentonite was increased by 0.5%, all else being unchanged. The manufacturing process was the same as in example 1.
Example 3
Compared with the example 1, the PA is removed, the POA is increased to 30 percent, the POEM is reduced to 10 percent, the covering medium is reduced to 7 percent, 5 percent of PUA and 3 percent of silica are newly added, and the manufacturing process is the same as that of the example 1 except for the change.
Example 4
Compared with the example 1, the POA is removed, the POEM is increased to 30 percent, 5 percent of PUA and 4 percent of silica and 1 percent of barium sulfate are newly added, the covering medium is reduced to 5 percent, the weight parts of other raw materials are the same as the example 1, and the manufacturing process is the same as the example 1.
Wherein the conductive medium in table 1 is conductive carbon black, and the covering medium is titanium dioxide.
Ethylene glycol monobutyl ether is used as a main film-forming assistant, and isopropanol is used as a cosolvent.
HV30 is an alkali swelling thickener.
Table 1: raw material composition and formulation parts by weight list for each example and comparative example
Comparative example 1
Compared with the example 1, the change points are that the PA is increased to 20 percent, 20 percent of PUA is newly added, the POEM is removed, the POA is changed from 20 percent to 5 percent, the weight parts of other raw materials are the same as that of the example 1, and the manufacturing process is the same as that of the example 1.
Comparative example 2
Compared with example 2, 5% of PUD and 0.5% of bentonite are removed, the weight of the polyamide wax is increased from 0.5% to 1%, the weight parts of other raw materials are unchanged, and the manufacturing process is the same as that of example 2.
Substrate board performance verification
The project was to test the performance of the single spray and rework spray pieces of each example and comparative example, with the one-shot (3C3B) platemaking process bake times being unified as: standing the recoated piece at 80 ℃ for 40min for 10 days, and then performing back spraying; the curing conditions before the performance test were: 60 ℃ for 2 days or 80 ℃ for 8 h; the test substrate is a PP plate particle model: EF119AEC-9502, ABS/PC plate particle type: ABS-XR 404. The detailed test items and methods are shown in table 2 below, and the test results of examples 1 to 4 and comparative examples 1 to 2 are shown in table 3 below.
Table 2: coating key performance test item and test method
Table 3: comparison of the Performance test of each example with that of the comparative example
From the results of the examples and comparative examples in table 3, it can be obtained:
the PUD has obvious improvement effects on the bending resistance of a heavy-coating finger-resistant button and a paint film, the high-pressure flushing and the drop hammer impact.
2. When the addition of the POA or the POEM is less than or equal to 5 percent, the adhesive force of the PP base material is poor, and particularly when a PU layer is recoated, the PU layer is easily torn off.
3. The conductive medium amount is not changed, the replacement and the change of other pigments and fillers are performed, and the conductivity of the dry film is not influenced under the condition that the total pigment ratio is not changed.
4. Maintaining reasonable binder (binder) prices is key to good mechanical and chemical performance, and the architecture of the four embodiments is the result: PA/PUA combination + POA/POEM combination + PUD, and thus the highlight thereof lies in the combination of adhesives (binder) as claimed in the present invention.
It should be understood that the above-described embodiments of the present invention are merely illustrative of the technical concept and features of the present invention, and are not intended to limit the embodiments of the present invention, so that those skilled in the art can understand the contents of the present invention and implement the present invention, and that other variations or modifications can be made on the basis of the above description for those skilled in the art.
Claims (11)
1. The universal low-temperature water-based conductive primer for the automobile parts is characterized by comprising the following components in parts by weight:
0-20 parts of acrylic emulsion;
0-20 parts of polyurethane acrylic hybrid copolymer;
0-20 parts of polyurethane dispersion;
10-40 parts of chlorinated polyolefin emulsion;
10-40 parts of acrylic acid modified chlorinated polyolefin emulsion;
10-40 parts of pure water;
0-20 parts of an auxiliary agent;
10-30 parts of pigment and filler.
2. The low-temperature waterborne conductive primer for automobile parts in general according to claim 1, wherein the acrylic emulsion is an anionic self-crosslinking emulsion.
3. The low-temperature waterborne conductive primer for automobile parts in general according to claim 1, wherein the polyurethane acrylic hybrid copolymer is an aliphatic polyurethane acrylic hybrid.
4. The low-temperature waterborne conductive primer for automobile parts according to claim 1, wherein the polyurethane dispersion is an anionic polyurethane dispersion.
5. The low-temperature waterborne conductive primer for automobile parts as claimed in claim 1, wherein the chlorinated polyolefin emulsion is a chlorinated polypropylene emulsion.
6. The universal low-temperature aqueous conductive primer for automobile parts according to claim 1, wherein the acrylic modified chlorinated polyolefin emulsion is self-emulsifying acrylic modified chlorinated polypropylene.
7. The universal low-temperature water-based conductive primer for automobile parts as claimed in claim 1, wherein the pigment and filler is one or more of titanium dioxide, talc, conductive carbon black, fumed silica, magnesium aluminum silicate, bentonite, barium sulfate, aluminum tripolyphosphate, diatomite, kaolin and calcium carbonate.
8. The universal low-temperature water-based conductive primer for automobile parts as claimed in claim 1, wherein the auxiliary agent comprises any one or more of a surfactant, a bactericide, a rheological aid, a pH regulator, a film-forming aid, a cosolvent, a thickener, an anti-salt spray aid or a hydrophobic aid;
the surfactant is any one or more of a wetting leveling agent, a wetting dispersing agent, a defoaming agent, a foam inhibitor or an anti-floating agent;
the rheological additive is an organic or inorganic rheological additive, and the organic rheological additive is any one or more of polyurethane association type, alkali dissolution and expansion type, polyamide wax or EVA wax type rheological additive;
the inorganic rheological additive is one or more of magnesium aluminum silicate, talcum powder, gas-phase silicon dioxide, attapulgite or bentonite.
9. The method for preparing the low-temperature waterborne conductive primer for the automobile parts in general according to any one of claims 1 to 8, comprising the following steps:
firstly, adding a proper amount of pure water and part of auxiliary agents in sequence under low-speed stirring, adjusting the pH value to a set range, and then adding one or more of PA/PUA/POA;
then stirring uniformly at medium speed, sequentially adding the pigment and filler, adjusting the viscosity to be suitable by pure water, and dispersing at high speed for 30-60 min;
secondly, grinding the premixed slurry obtained in the first step to the fineness of 10 mu m, filtering out the ground slurry, and calculating the weight and the yield;
and thirdly, adding a proper amount of auxiliary agent and one or more of the POEM/PUD/PUA into the slurry obtained in the second step, adding the rest auxiliary agent, and adjusting the solid content, the viscosity and the pH value to be qualified to obtain the water-based conductive primer.
10. The method for preparing the low-temperature water-based conductive primer for automobile parts as claimed in claim 9, wherein the low speed is 100-300rpm, the medium speed is 500-700rpm, and the high speed is not lower than 800 rpm; the pH value to a set range is 8-9.
11. Use of the universal low temperature aqueous conductive primer for automobile parts according to any one of claims 1 to 8, wherein the use is as a low temperature aqueous conductive primer for electrostatic spraying, sprayed on automobile bumpers, PET/PBT, ABS/PC plastic parts, or on SMC, EG + CF synthetics and electrophoretic layers.
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| CN202111273420.3A CN114410160A (en) | 2021-10-29 | 2021-10-29 | Universal low-temperature water-based conductive primer for automobile parts and preparation method and application thereof |
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| CN202111273420.3A CN114410160A (en) | 2021-10-29 | 2021-10-29 | Universal low-temperature water-based conductive primer for automobile parts and preparation method and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114672203A (en) * | 2022-05-10 | 2022-06-28 | 南京宇越水性涂料技术有限公司 | Water-based bumper primer for automobile after-market and using method thereof |
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| CN111117380A (en) * | 2020-01-03 | 2020-05-08 | 廊坊立邦涂料有限公司 | Water-based primer for automobile plastic parts and preparation method and application thereof |
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| CN104231764A (en) * | 2013-06-05 | 2014-12-24 | 现代摩比斯株式会社 | Primerless base painting composition for parts of vehicle, kit comprising the same, painted parts of vehicle |
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Application publication date: 20220429 |