CN103555115A - Paint for galvanized sheet and preparation method thereof - Google Patents

Abstract

The invention provides paint for a galvanized sheet. The paint for the galvanized sheet is prepared by mixing 45-55 parts of LH-60 resin, 14-19 parts of isobutanol etherification amino resin, 20-25 parts of titanium dioxide R-215, 0.5-1 part of carbon black, 0.1-0.5 part of anti-settling agent, 0.1-0.3 part of wetting dispersant, 0.1-0.3 part of leveling agent, 1-2 parts of silane coupling agent Si69, 1-3 parts of butyl alcohol, 9-11 parts of modified filler and 8-14 parts of mixed diluent. A film of the paint for the galvanized sheet has excellent oil resistance, excellent water resistance and good adhesion, is an environment-friendly product and is especially applicable to protection of the galvanized sheet.

Description

Coating and preparation method thereof for a kind of galvanized sheet

Technical field:

The present invention relates to paint field, be specifically related to coating and preparation method thereof for a kind of galvanized sheet.

Background technology:

According to customer requirements, need pin spray paint on galvanized sheet, because galvanized sheet is difficult to adhere to, therefore developed galvanized sheet series paint.Adopted zinc-chrome yellow epoxy primer, zinc-chrome yellow contains heavy metal in the past, and construction need priming paint, finish paint twice, not only lose time but also waste energy, decorate properties is not high yet, can not adapt to new technical requirements.Acrylic resin by epoxy resin modification has multiple functional radical, many reflecting points, good attachment to ground, lacquering adopts auxiliary agent and isopropylcarbinol etherify melamine resin 130 degree baking 0.5 hour, its multiple functional radical, cross-linking density after many reflecting points and special assistant and amino film forming is improved, in filming by dissolving each other, the effects such as winding make to form Chemical bond power between paint film and galvanized sheet and have fundamentally solved the attachment issue to galvanized sheet, film performance had both possessed amino hard wear resistant, oil-proofness possesses again vinylformic acid and protects light, tint retention, and this product is not containing heavy metal, bottom surface unification, first drying film forming, save energy.

Summary of the invention:

The invention provides coating and preparation method thereof for a kind of galvanized sheet.The unification of coating of the present invention bottom surface, 130 degree bakings 0.5 hour, a crosslinking reaction film forming, select silane coupling agent si69, in filming, by crosslinked, dissolve each other, the effect such as winding makes to form between paint film and galvanized sheet Chemical bond power, thereby on galvanized sheet, have excellent sticking power.

The technical solution used in the present invention is as follows for achieving the above object:

A coating, is characterized in that, its component by following weight part is made:

LH-60 resin 45-55, isopropylcarbinol etherified amino resins 14-19, titanium dioxide R-21520-25, carbon black 0.5-1, anti-settling agent 0.1-0.5, wetting dispersing agent 0.1-0.3, flow agent 0.1-0.3, silane coupling agent si691-2, butanols 1-3, modified filler 9-11, mixed diluent 8-14

Described mixed solvent is mixed by the volume ratio of 3: 1: 1 by dimethylbenzene, ethylene glycol ether acetate, secondary butyl ester three;

The preparation method of described LH-60 resin is:

(1) take by weight following component:

Dimethylbenzene 32-38,2-Butoxyethyl acetate 8-12, methyl methacrylate 10-15, senecioate-hydroxypropyl acrylate 10-15, Isooctyl acrylate monomer 10-15, vinylformic acid 5-10, vinylbenzene 8-12, benzoyl peroxide 1-1.5, epoxy resin E424-9;

(2) initiator of the monomer of formula ratio and 80% is made into compound A, remaining initiator is dissolved in mixed solvent and makes the initiator solution B that concentration is 20-30%, standby;

(3) in reactor, add dimethylbenzene and the 2-Butoxyethyl acetate of epoxy resin, 90% formula ratio, be warming up to 90 ℃, maintain be stirred to epoxy resin complete molten after, start to drip compound A prepared by step (1), in 2-2.6h, drip off compound, after 95 ± 2 ℃ of insulation 2h, be warming up to 105 ± 2 ℃ and add initiator solution B prepared by step (1), in 1h, drip off insulation 1-2 hour;

(4) when transformation efficiency reaches 98% when above, cooling, filtration, discharging obtain LH-60 resin;

Described modified filler is to be prepared and obtained by following method: a. takes off the raw material of row weight part: kaolin 100-150, calcium carbonate 120-130, zeolite 10-12, nano-sized carbon 1-2, tungstic oxide 1-2, lanthanum trioxide 2-3, peppermint essential oil 2-3, Sodium peroxoborate 1-2, aluminum oxide 2-3, precipitator method barium sulfate 30-34, tea-polyphenol 3-4, triethyl citrate 1-2, titanate coupling agent TMC-TTS4-6, jade powder 1-2;

B, kaolin, calcium carbonate, zeolite are calcined to 4-5h at 450-480 ℃, be cooled to room temperature, after taking-up, add in the sodium hydroxide solution of 3-4% and grind 1-2 hour, then, the hydrochloric acid soln that adds 12-15%, adjusting pH value is 4-5, ageing 10-15 hour, and it is neutral that repeated hydrogenation sodium hydroxide solution regulates lapping liquid pH, filter, dry and obtain filler powder;

C, above-mentioned gained powder is mixed with other remaining component, and even with the high speed dispersion of 8000-10000 rev/min, obtain.

The production method of coating for described galvanized sheet, is characterized in that, comprises the following steps:

(1) by LH-60 resin, wetting dispersing agent, pigment, filler, with 2000-2600r/min speed, high speed dispersion 1-1.5 hour; Enter sand mill circular grinding to fineness control≤20u, outlet material temperature≤60 ℃;

(2) material that mesh-of-grind is qualified adds to adjust to be converted in still, and with color paste toning to after meeting the requirements, add isopropylcarbinol etherified amino resins, 1% silicone oil xylene solution, and rest materials, with the middling speed of 100-200r/min, stir;

(3), after stirring evenly, with mixed solvent, adjust viscosity to 60-80(S)/be coated with-4, with 200 order vibratory screening apparatuss, filter, pack.

Advantage of the present invention:

1, the present invention selects methyl methacrylate, styrene monomer as hard monomer, select Isooctyl acrylate monomer as soft monomer, snappiness is provided, promotes film forming, provide senecioate-hydroxypropyl acrylate that cross-linking set is provided, adjust cross-linking density, improve sticking power, add few Acrylic Acid Monomer, introduce carboxyl, make it to react with epoxy group, improve wetting and the adhering to base material of resin to face, filler.

2, coating high bake of the present invention nondiscoloration, films and has excellent weathering resistance; Adding of modified filler, improved the intermiscibility of formula materials, improved coating stability in storage.

3, the present invention adopts acrylic resin modified, aminoresin, at 130 ℃, crosslinking reactions occur, in filming by dissolving each other, the effect such as winding makes to form between paint film and galvanized sheet Chemical bond power, thereby has excellent sticking power.

4, bottom surface of the present invention unification, one-pass film-forming, save energy.

Embodiment

One, the synthetic LH-60 resin of embodiment 1

(2) technique

1., the initiator of the monomer of formula ratio and 80% is made into compound standby;

2. the dimethylbenzene and the butyl ester that, in reactor, add epoxy resin, 90% formula ratio, be warming up to 90 ℃, maintain be stirred to epoxy resin complete molten after, the compound of preparation in starting to drip 1., in 2-2.6h, drip off compound, after 95 ± 2 ℃ of insulation 2h, be warming up to 105 ± 2 ℃ of mixing solutionss (initiator is dissolved in mixed solvent) of adding remaining initiator, in 1h, drip off, maintain more than 1 hour;

3., survey transformation efficiency and reach 98% when above, cooling, filtration, discharging obtain resin.

(3) LH-60 resin leading indicator:

2, lacquering

(1) formula forms

Mixed solvent is mixed by the volume ratio of 3: 1: 1 by dimethylbenzene, ethylene glycol ether acetate, secondary butyl ester three;

(2) technique

1. by LH-60 resin, wetting dispersing agent, face, filler high speed dispersion (2000-2600r/min) after 1 hour;

2. enter sand mill circular grinding, outlet material temperature≤60 ℃, lacquering fineness controls≤20;

3. the material that mesh-of-grind is qualified adds to adjust to be converted in still, and with color paste toning to after meeting the requirements, add isopropylcarbinol etherified amino resins, 1% silicone oil dimethylbenzene liquid and rest materials, middling speed (100-200r/min) stirs evenly;

4., after stirring evenly, with mixed solvent, adjust viscosity to 60-80(S)/be coated with-4, with 200 order vibratory screening apparatuss, filter, pack.

Wherein, modified filler is to be prepared and obtained by following method: a. takes off the raw material of row weight part: kaolin 130, calcium carbonate 125, zeolite 11, nano-sized carbon 1, tungstic oxide 2, lanthanum trioxide 2.5, peppermint essential oil 3, Sodium peroxoborate 2, aluminum oxide 2 precipitator method barium sulfate 33, tea-polyphenol 3, triethyl citrate 2, titanate coupling agent TMC-TTS5, jade powder 1.5;

B, kaolin, calcium carbonate, zeolite are calcined to 4-5h at 450-480 ℃, be cooled to room temperature, after taking-up, add in the sodium hydroxide solution of 3-4% and grind 1-2 hour, then, the hydrochloric acid soln that adds 12-15%, adjusting pH value is 4-5, ageing 10-15 hour, and it is neutral that repeated hydrogenation sodium hydroxide solution regulates lapping liquid pH, filter, dry and obtain filler powder;

C, above-mentioned gained powder is mixed with other remaining component, and even with the high speed dispersion of 8000-10000 rev/min, obtain.

(3) lacquering measured result

Claims (2)

1. a galvanized sheet coating, is characterized in that, its component by following weight part is made:

LH-60 resin 45-55, isopropylcarbinol etherified amino resins 14-19, titanium dioxide R-215 20-25, carbon black 0.5-1, anti-settling agent 0.1-0.5, wetting dispersing agent 0.1-0.3, flow agent 0.1-0.3, silane coupling agent si69 1-2, butanols 1-3, modified filler 9-11, mixed diluent 8-14

Described mixed solvent is mixed by the volume ratio of 3: 1: 1 by dimethylbenzene, ethylene glycol ether acetate, secondary butyl ester three;

The preparation method of described LH-60 resin is:

(1) take by weight following component:

Dimethylbenzene 32-38,2-Butoxyethyl acetate 8-12, methyl methacrylate 10-15, senecioate-hydroxypropyl acrylate 10-15, Isooctyl acrylate monomer 10-15, vinylformic acid 5-10, vinylbenzene 8-12, benzoyl peroxide 1-1.5, epoxy resin E42 4-9;

(2) initiator of the monomer of formula ratio and 80% is made into compound A, remaining initiator is dissolved in mixed solvent and makes the initiator solution B that concentration is 20-30%, standby;

(3) in reactor, add dimethylbenzene and the 2-Butoxyethyl acetate of epoxy resin, 90% formula ratio, be warming up to 90 ℃, maintain be stirred to epoxy resin complete molten after, start to drip compound A prepared by step (1), in 2-2.6h, drip off compound, after 95 ± 2 ℃ of insulation 2h, be warming up to 105 ± 2 ℃ and add initiator solution B prepared by step (1), in 1h, drip off insulation 1-2 hour;

(4) when transformation efficiency reaches 98% when above, cooling, filtration, discharging obtain LH-60 resin;

Described modified filler is to be prepared and obtained by following method: a. takes off the raw material of row weight part: kaolin 100-150, calcium carbonate 120-130, zeolite 10-12, nano-sized carbon 1-2, tungstic oxide 1-2, lanthanum trioxide 2-3, peppermint essential oil 2-3, Sodium peroxoborate 1-2, aluminum oxide 2-3, precipitator method barium sulfate 30-34, tea-polyphenol 3-4, triethyl citrate 1-2, titanate coupling agent TMC-TTS 4-6, jade powder 1-2;

B, kaolin, calcium carbonate, zeolite are calcined to 4-5h at 450-480 ℃, be cooled to room temperature, after taking-up, add in the sodium hydroxide solution of 3-4% and grind 1-2 hour, then, the hydrochloric acid soln that adds 12-15%, adjusting pH value is 4-5, ageing 10-15 hour, and it is neutral that repeated hydrogenation sodium hydroxide solution regulates lapping liquid pH, filter, dry and obtain filler powder;

C, above-mentioned gained powder is mixed with other remaining component, and even with the high speed dispersion of 8000-10000 rev/min, obtain.

2. the production method of coating for galvanized sheet according to claim 1, is characterized in that, comprises the following steps:

(1) by LH-60 resin, wetting dispersing agent, pigment, filler, with 2000-2600r/min speed, high speed dispersion 1-1.5 hour; Enter sand mill circular grinding to fineness control≤20u, outlet material temperature≤60 ℃;

(2) material that mesh-of-grind is qualified adds to adjust to be converted in still, and with color paste toning to after meeting the requirements, add isopropylcarbinol etherified amino resins, 1% silicone oil xylene solution, and rest materials, with the middling speed of 100-200 r/min, stir;

(3), after stirring evenly, with mixed solvent, adjust viscosity to 60-80(S)/be coated with-4, with 200 order vibratory screening apparatuss, filter, pack.