CN102167951B - Environment-friendly dual-curing vacuum coating primer special for automobile wheel hub - Google Patents

Abstract

The invention discloses an environment-friendly dual-curing vacuum coating primer special for an automobile wheel hub, which is prepared from the following components in percentage by mass: 25-35% of NCO-containing polyurethane acrylate, 5-10% of aliphatic polyurethane diacrylate, 5-10% of phenolic epoxy acrylate, 10-20% of aliphatic epoxy acrylate, 20-35% of reactive diluent, 1-5% of photoinitiator and 0.1-1% of assistant. The primer has the advantages of energy saving, environment friendliness, strong adhesive force on the metal surface, excellent leveling property and high gloss; the primer can well cover defects on the material only after one primer coating is applied, thereby having favorable covering power; the primer has favorable adhesive force with both the wheel hub material and the vacuum coating layer; after the primer is baked at 170 DEG C for 2 hours, the surface looks no difference; and the primer also has recoating property.

Description

The special-purpose dual cure vacuum plating of eco-friendly car wheel hub priming paint

Technical field

The invention belongs to the dual cure technology in ultraviolet-curing paint field, relate in particular to the special-purpose dual cure vacuum plating of automotive hub priming paint.

Background technology

Along with the development that Domestic Automotive Industry is advanced by leaps and bounds, automotive hub is as the automobile accessories product, and its demand will sharply increase.The wheel hub material mainly contains ferrous materials, alloy material, matrix material three major types, and its surface treatment method is main with plated film (water power plating and vacuum plating).Wherein, there are shortcomings such as complex process, cost is high, energy consumption is high, environmental pollution is serious in the water power electroplating method, certainly will be eliminated by the wheel hub manufacturer.Vacuum coating method not only can overcome the weak point of electro-plating method, and can obtain light, heat-resisting, good ornamental surface, will become the surface treatment method of main flow.Yet because wheel hub material surface rough porous, existing processes is that spray coating powder paint and the baking finish of solvent-borne type high temperature obtain smooth, even curface before vacuum plating.This kind complex process, consuming time, and high temperature baking finish energy consumption is high, production efficiency is low, the product yield is low, finally causes vacuum coating method can't replace electro-plating method fully.UV-light (UV) coating normal temperature fast setting, production efficiency height, energy-saving and environmental protection, economic dispatch advantage are a dark horse in coating industry.If UV coating is incorporated on the wheel hub, will greatly simplify production technique, enhance productivity, reduce energy consumption and environmental pollution.But common UV priming paint in the metallic surface difficulty adhere to, and UV-irradiation less than the shade position can't solidify, therefore common UV vacuum plating priming paint is not suitable for the application of automotive hub.The invention provides a kind of vacuum plating priming paint of dual cure, this priming paint can ultraviolet light polymerization, and the shade position can self cure, and adheres to by force in the metallic surface, is fit to very much the automotive hub application.

Summary of the invention

The purpose of this invention is to provide special-purpose dual cure vacuum plating priming paint of a kind of automotive hub and preparation method thereof.It is matrix resin (under other component synergies, sticking power and the coating adhesion to the metallic surface being provided) that dual cure priming paint of the present invention adopts dual cure resin (urethane acrylate that contains isocyano); Be aided with the good aliphatic urethane diacrylate of plating property; The phenolic aldehyde epoxy acrylate that high thermal resistance is good, viscosity is low, the aliphatic epoxy acrylate of good leveling property and reactive thinner; Light trigger, auxiliary agent etc.This priming paint is owing to be matrix resin with the dual cure resin, forms with the resin rational allocation of other performance that differs from one another, and it is strong at various metal wheel hub surface adhesion forces, and levelling is opacifying property fabulous, and glossiness is high.Only need one deck priming paint just can cover the flaw of material well; Last plating property is good, 170 ℃ of high temperature of ability; Dash area can solidify through isocyano voluntarily, and sticking power is not strong in the metallic surface to have solved common UV priming paint, and dash area can not a solidified difficult problem.

The object of the invention can reach through following measure:

The special-purpose dual cure vacuum plating of a kind of eco-friendly car wheel hub priming paint, its component by following mass content is processed:

The urethane acrylate 25%～35% that contains isocyano,

Aliphatic urethane diacrylate 5%～10%,

Phenolic aldehyde epoxy acrylate 5%～10%,

Aliphatic epoxy acrylate 10%～20%,

Reactive thinner 20%～35%,

Light trigger 1%～5%,

Auxiliary agent 0.1%～1%,

Wherein each component sum is 100%.

The urethane acrylate that contains isocyano of the present invention is selected from the LS2337 of Baeyer, LS2396, XP2510, the LR9000 of BASF, one or more among the UVDC-2700 of the how gloomy chemical industry in Shanghai etc.

Aliphatic urethane diacrylate of the present invention is selected from the synthetic UV-3000B of Japan, Japanese synthetic UV-3200B, Sartomer CN9001, one or more among the Japanese chemical drug UXF-4002W etc.

Phenolic aldehyde epoxy acrylate of the present invention is selected from one or more among Changxing 625C-45, Sartomer CN112C60, the special EB639 of cyanogen, the Japanese chemical drug EAM-2160W etc.

Aliphatic epoxy acrylate of the present invention is selected from the MEA-1 of Korea S Miwon company, and MEA-2 is among the MEA-5, a kind of or several among the MEA-6 etc.

Reactive thinner of the present invention adopts the esters of acrylic acid thinner; Specifically can select in the following material one or more for use: Hydroxyethyl acrylate (HEA), Rocryl 400 (HEMA), IBOA (IBOA), isobornyl methacrylate (IBOMA), Bing Xisuandingzhi (BA), propylene glycol diacrylate (DPGDA), 1,6 hexanediol diacrylate (HDDA), tristane dimethanol diacrylate (DCPDA), tripropylene glycol diacrylate (TPGDA), Viscoat 295 (TMPTA), three (2-hydroxyethyl) tricarbimide triacrylate (THEICTA), tetramethylol methane tetraacrylate (PETA), Dipentaerythritol five propenoate (DPPA), dipentaerythritol acrylate (DPHA), alkoxide propenoate etc.; Preferred adopt two or more among TMPTA, PETA, DPHA, IBOA and the BA.The content of thinner is preferably 30-35%.

Light trigger of the present invention is 1-hydroxyl-cyclohexyl-phenyl ketone (Irgacure 184), 2-hydroxy-2-methyl-1-phenyl-1-acetone (Darocur 1173), st-yrax diethyl ether (651; BDK), 2-methyl isophthalic acid-(4-(methylthio group) phenyl)-2-morpholinyl-1-acetone (Irgacure 907), 2; 4,6-trimethylbenzoyl-diphenyl phosphine oxide (TPO), UVNUL MS-40 (BP), isopropyl thioxanthone (ITX), UVNUL MS-40 (BP)+reactive amines etc.; Preferred 1-hydroxyl-cyclohexyl-phenyl ketone, the 2-methyl isophthalic acid-(4-(methylthio group) phenyl)-2-morpholinyl-1-acetone, 2,4 of adopting, two or more in 6-trimethylbenzoyl-diphenyl phosphine oxide.The content of light trigger is preferably 1-4%

Auxiliary agent of the present invention is selected from one or more in silicone based flow agent, non-silicon flow agent, the fluorocarbon surfactant, one or more in the concrete optional certainly following solvent: BYK306 (polyether-modified YSR 3286 solution), BYK333 (polyether-modified dimethyl siloxane), BYK307 (polyether-modified YSR 3286 interpolymer solution), BYK371 (the polyester modification YSR 3286 solution of acrylate-functional base), BYK358 (modified polyacrylate compounds), EFKA3600 (fluorine-carbon modified vinylformic acid), EFKA3883 (with unsaturated group terminated silicone modified polymers), EFKA3777 (fluorine-carbon modified polyacrylic ester), TEGO 450 (polysiloxane-copolyether), TEGO 432 (polysiloxane-copolyether), YCK-1040 (polyether-modified YSR 3286 interpolymer), YCK-1060 (alkylaryl silicone oil flow agent), the FC4430 of 3M company (nonionic aggretion type fluorochemical surfactant) etc.; Preferred EFKA3600 or the FC4430 of adopting.The content of auxiliary agent is preferably 0.1-0.5%.

The special-purpose dual cure vacuum plating of eco-friendly car wheel hub of the present invention priming paint adopts following method preparation:

(1) reactive thinner, aliphatic epoxy acrylate, aliphatic urethane diacrylate and phenolic aldehyde epoxy acrylate are mixed is incorporated in 40～50 ℃ of following stirring and dissolving;

(2) continue to add urethane acrylate and the light trigger that contains isocyano, mix;

(3) add auxiliary agent again, stir after-filtration.Can adopt high-speed stirring in this step, filtration can be adopted 500 order filter clothes.

Beneficial effect of the present invention:

Dual cure vacuum plating priming paint of the present invention is compared with existing high temperature baking vanish: it has the advantage that common UV priming paint is had: energy-conservation, and environmental protection, efficient, economy.Compare with existing common UV priming paint, it has the strong adhesion in the metallic surface, and glossiness is high, and levelling is opacifying property fabulous, only needs one deck priming paint just can cover the flaw of material well; Last plating property is good, and high temperature resistant (like 170 ℃ of high temperature of ability), dash area can be particularly suitable for the application of complex part such as automotive hub etc. through advantages such as isocyano solidify voluntarily.

Embodiment

With specific examples the present invention is done further elaboration below, only be used for explanation, do not limit scope of invention.

The preparation of priming paint:

(1) reactive thinner, aliphatic epoxy acrylate, aliphatic urethane diacrylate and phenolic aldehyde epoxy acrylate are put in the reaction kettle, made its dissolving in 1 hour 45 ℃ of following heated and stirred;

The urethane acrylate and the light trigger that (2) will contain isocyano again join in the reaction kettle, stir 0.5h;

(3) at last auxiliary agent is joined in the reaction kettle, filter with 500 order filter clothes behind the high-speed stirring 0.5h, last loading barrel packaging.

Below each example all as stated above the preparation.

The prescription of priming paint:

Each embodiment prepares burden by the quality proportioning in table 1 and the table 2 respectively and prepares the special-purpose dual cure vacuum plating of eco-friendly car wheel hub of the present invention priming paint.

Table 1

Table 2

Performance test:

Automotive hub is after polishing, oil removing, dedusting, and again with the spraying of above-mentioned priming paint on it, the control thickness is at 50-70um, and infrared levelling 5-10 minute is curing 1100-1500mj/cm2 under at the UV energy, carries out vacuum aluminum-coatedly then, detects its performance at last.

Table 3

Claims (9)

1. the special-purpose dual cure vacuum plating of eco-friendly car wheel hub priming paint, it is characterized in that: the component by following mass content is processed:

The urethane acrylate 25%～35% that contains isocyano,

Aliphatic urethane diacrylate 5%～10%,

Phenolic aldehyde epoxy acrylate 5%～10%,

Aliphatic epoxy acrylate 10%～20%,

Reactive thinner 20%～35%,

Light trigger 1%～5%,

Auxiliary agent 0.1%～1%.

2. the special-purpose dual cure vacuum plating of eco-friendly car wheel hub according to claim 1 priming paint, it is characterized in that: the said urethane acrylate that contains isocyano is selected from one or more among the how gloomy chemical industry UVDC-2700 in Baeyer LS2337, Baeyer LS2396, Baeyer XP2510, BASF LR9000 or Shanghai; Said aliphatic urethane diacrylate is selected from one or more among the synthetic UV-3000B of Japan, the synthetic UV-3200B of Japan, Sartomer CN9001, the Japanese chemical drug UXF-4002W; Said phenolic aldehyde epoxy acrylate is selected from one or more among Changxing 625C-45, Sartomer CN112C60, the special EB639 of cyanogen, the Japanese chemical drug EAM-2160W; Said aliphatic epoxy acrylate is selected from one or more among the MEA-1, MEA-2, MEA-5, MEA-6 of Korea S Miwon.

3. the special-purpose dual cure vacuum plating of eco-friendly car wheel hub according to claim 1 priming paint, it is characterized in that: said reactive thinner is the propenoate thinner; The mass content of said reactive thinner is 30-35%.

4. the special-purpose dual cure vacuum plating of eco-friendly car wheel hub according to claim 3 priming paint; It is characterized in that: said reactive thinner is selected from one or more in the following material: Hydroxyethyl acrylate, Rocryl 400, IBOA, isobornyl methacrylate, Bing Xisuandingzhi, propylene glycol diacrylate, 1,6 hexanediol diacrylate, tristane dimethanol diacrylate, tripropylene glycol diacrylate, Viscoat 295, three (2-hydroxyethyl) tricarbimide triacrylate, tetramethylol methane tetraacrylate, Dipentaerythritol five propenoate, dipentaerythritol acrylate, alkoxide propenoate.

5. the special-purpose dual cure vacuum plating of eco-friendly car wheel hub according to claim 1 priming paint; It is characterized in that: said light trigger is selected from one or more in the following material: 1-hydroxyl-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-acetone, st-yrax diethyl ether, 2-methyl isophthalic acid-(4-(methylthio group) phenyl)-2-morpholinyl-1-acetone, 2; 4, the combination of 6-trimethylbenzoyl-diphenyl phosphine oxide, UVNUL MS-40, isopropyl thioxanthone, UVNUL MS-40 and reactive amines.

6. the special-purpose dual cure vacuum plating of eco-friendly car wheel hub according to claim 5 priming paint; It is characterized in that: said light trigger is selected from two or more in the following material: 1-hydroxyl-cyclohexyl-phenyl ketone, 2-methyl isophthalic acid-(4-(methylthio group) phenyl)-2-morpholinyl-1-acetone, 2; 4, two or more in 6-trimethylbenzoyl-diphenyl phosphine oxide.

7. the special-purpose dual cure vacuum plating of eco-friendly car wheel hub according to claim 1 priming paint, it is characterized in that: said auxiliary agent is selected from one or more in organosilicon flow agent, non-silicon flow agent, the fluorocarbon surfactant.

8. the special-purpose dual cure vacuum plating of eco-friendly car wheel hub according to claim 7 priming paint, it is characterized in that: said auxiliary agent is selected from one or more in the following auxiliary agent: BYK306, BYK333, BYK307, BYK371, BYK358, EFKA3600, EFKA3883, EFKA3777, TEGO450, TEGO 432, YCK-1040, YCK-1060, FC4430.

9. the preparation method of the special-purpose dual cure vacuum plating of the described eco-friendly car wheel hub of claim 1 priming paint is characterized in that: comprise the steps:

(1) reactive thinner, aliphatic epoxy acrylate, aliphatic urethane diacrylate and phenolic aldehyde epoxy acrylate are mixed is incorporated in 40～50 ℃ of following stirring and dissolving;

(2) continue to add urethane acrylate and the light trigger that contains isocyano, mix;

(3) add auxiliary agent again, stir after-filtration.