CN103555121B - A kind of aqueous automobile chassis corrosion resistant coating and preparation method thereof - Google Patents

Abstract

The invention provides a kind of aqueous automobile chassis corrosion resistant coating, this automobile coating, by LH-302 resin 48-52, carbon black 2.0-2.5, iron black 7-9, modification aluminium triphosphate 12-13, organic nitrogen zinc salt 1-3, modified filler 9-11, wetting dispersing agent 0.3-0.5, corrosion inhibiter 0.8-1.0, ground wetting agent 0.3-0.5, auxiliary agent 0.1-2.0, deionized water 10-12, is mixed with and forms. Aqueous automobile of the present invention chassis corrosion resistant coating normal temperature can be from dry, low temperature drying (80～90 DEG C are dried 0.5 hour), and paint film property obviously strengthens, and adhesive force, hardness, salt fog resistance are all very desirable. Be mainly used in automotive axle, automobile chassis and auto parts and components etc.

Description

A kind of aqueous automobile chassis corrosion resistant coating and preparation method thereof

Technical field:

The present invention relates to paint field, be specifically related to a kind of aqueous automobile chassis corrosion resistant coating and preparation method thereof.

Background technology:

Along with people's environmental consciousness strengthens and the corresponding appearance of various countries' environmental regulation day by day, solvent reducible coatings is because its volatile organic compounds (VOC) content is high, severe contamination ecological environment, therefore its application is more and more restricted. Aqueous black automobile chassis corrosion resistant coating is a new technology of field of Environment Protection projection, it has adopted IPN ipn technology, not only reach zero VOC discharge, improve environment, reduce labour intensity, and film performance can want to match in excellence or beauty with solvent reducible coatings, construction equipment and execution conditions are also close with solvent reducible coatings construction, and diluent is ordinary tap water.

Summary of the invention:

The invention provides a kind of aqueous automobile chassis corrosion resistant coating preparation method. Product normal temperature of the present invention can be from dry, low temperature drying (80～90 DEG C are dried 0.5 hour), and paint film property obviously strengthens, and adhesive force, hardness, salt fog resistance are all very desirable. Be mainly used in automotive axle, automobile chassis and auto parts and components etc.

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

A kind of aqueous automobile chassis corrosion resistant coating, is characterized in that, its component by following weight portion is made:

LH-302 resin 48-52, carbon black 2.0-2.5, iron black 7-9, modification aluminium triphosphate 12-13, organic nitrogen zinc salt 1-3, modified filler 9-11, wetting dispersing agent 0.3-0.5, corrosion inhibiter 0.8-1.0, ground wetting agent 0.3-0.5, auxiliary agent 0.1-2.0, deionized water 10-12

The preparation method of described LH-302 resin is:

(1) take by weight following component:

Epoxy resin E427-9, aliphatic acid 15-17, molecular weight regulator 0.1-0.3, silicone intermediate 3-5, methyl methacrylate 18-20, butyl acrylate 8-9, methoxy polyethylene glycol methacrylate-styrene polymer 2-4, hydroxy-ethyl acrylate ester 2-4, neopelex 2-4, benzoyl peroxide 0.5-0.7, mixed solvent 35-38;

(2) aliphatic acid is dropped in reactor, add epoxy resin, molecular weight regulator and partial solvent, carry out esterification in 150～160 DEG C, in the time that acid value is down to 30～50mgKOH/g, be considered as esterification terminal, be cooled to room temperature;

(3) in reactor, add silicone intermediate, surfactant, mixed solvent to stir and be warming up to backflow, drip again acrylic monomers and part initator, 2.5-3.2h drip off, insulation 1-1.5h, continues to drip remaining initator, is incubated 1.0-1.2h simultaneously again, discharging, regulate Ph to neutral, be diluted to the water-base resin liquid of solids content 40% by deionized water, be LH-302 resin;

Described modified filler is to be prepared and obtained by following method: a. takes off the raw material of row weight portion: kaolin 100-150, calcium carbonate 120-130, zeolite 10-12, nano-sized carbon 1-2, tungstic acid 1-2, lanthana 2-3, peppermint essential oil 2-3, sodium perborate 1-2, aluminium oxide 2-3, precipitation method barium sulfate 30-34, Tea Polyphenols 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 DEG C, be cooled to room temperature, after taking-up, add in the sodium hydroxide solution of 3-4% and grind 1-2 hour, then, add the hydrochloric acid solution of 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 residual components, and even with the high speed dispersion of 8000-10000 rev/min, to obtain final product.

Described aqueous automobile chassis corrosion resistant coating, is characterized in that: described auxiliary agent is selected from one or more in levelling agent, defoamer, drier, thickener.

The production method of described aqueous automobile chassis corrosion resistant coating, is characterized in that, comprises the following steps:

(1) by deionized water, wetting dispersing agent, defoamer, levelling agent, mix, then add part resin liquid, regulate pH value to 8.5-9.0;

(2) under agitation, add pigment, filler, after high speed dispersion 1-1.5h, with 80 mesh sieves filtrations, the material of filtration enters sand mill circular grinding to fineness≤25u, discharging, outlet material temperature≤60 DEG C;

(3) material that fineness of grind is qualified adds to adjust to be converted in still, and adds the rest materials in formula, stirs evenly with the high speed of 1250～2000r/min;

(4), after stirring evenly, adjust viscosity to 70-110KU by deionized water, pH value-10, then with 200 order vibratory sieves filtrations, pack.

Technical scheme deterministic process of the present invention:

(1) determining of organosilicon, the composite modified epoxy ester of acrylic acid resin (hereinafter to be referred as LH-302 resin):

In this composite modified epoxy ester resin, the present invention first utilize aliphatic acid at 150～160 DEG C to epoxy resin open loop, owing to introducing longer aliphatic chain in epoxy resin, improved hydroxyl value and the crosslink density of resin, the wearability of resin, adhesive force, weatherability be improved significantly. With epoxy resin, the silicone intermediate of open loop, the active group of surfactant-OH/-OR hydrophilic active group and acrylic resin carries out polycondensation reaction, thereby obtains water soluble polymer condensation copolymerization resin, has obtained the moderate IPN structure of molecular weight.

It is a kind of new synthetic technology that organosilicon chemistry is applied to acrylic acid epoxy polyisocyanate polyaddition, make the product generating there is material in three simultaneously, owing to having introduced the Si-O of organosilicon functional group key in resin, its bond energy is far longer than C-C, C-O key, thereby resistance to UV and oxidative degradation

Performance is good, and Si-O key is silica cross-bond in resin curing process, has increased the crosslink density of film, has accelerated resin transformation to three-dimensional-structure by linear polymeric.

(2) become determining of paint formula:

Aqueous anticorrosion paint of the present invention; mainly be applicable to the corrosion-resistanting decoration of automobile chassis and parts thereof; require the 150h of resistance to neutral salt spray, and not containing heavy metal, therefore selected environmental protection and there is dual rust-proof mechanism---be the modification aluminium triphosphate of chelating protection and physics rust inhibition; due to itself and steel structure chelated surface; make film finer and close, impervious better, reduce the penetration of water, oxygen, low-molecular material confrontation paint film; improve the salt fog resistance of paint film, strengthened the adhesive force of paint film. Organic nitrogen zinc salt, iron black choose reasonable and add in right amount, permeability resistance further strengthens, and every combination property of film is further optimized. Control pigment between 1: 1.8.

In corrosion resistant coating production technology of the present invention, LH-302 resin is the critical material of painting, synthetic temperature control, the reinforced at the uniform velocity control of property of resin is the key point of resin property quality, and effectively control can make the molecular weight distribution of synthetic resin narrower, thereby obtains desirable paint film; In sand milling operation, high-performance sand grinder grinds 2～3 roads, and fineness can reach below 25 μ, to improve the salt fog resistance of film. Viscosity and pH value must regulate the bin stability of product most important.

Advantage of the present invention:

1, the present invention adopts macromolecule ipn technology (IPN); synthesize the resin liquid of excellent performance by special process; decentralized medium is mainly deionized water; only have the organic solvent of minute quantity, VOC is extremely low, can be considered zero VOC discharge; construction diluent is running water; be conducive to environmental protection and workmen's health, saved resource, protected environment.

2, aqueous automobile of the present invention chassis corrosion resistant coating, film oil resistivity, resistance to water excellence, strong adhesion, after disposable film forming, can reach 30～50 μ m.

3, the aqueous automobile of the present invention chassis resistance to neutral salt spray of corrosion resistant coating can reach 150h, is up to 240h.

Detailed description of the invention

One, the synthetic LH-302 resin of embodiment 1

Main raw material(s)

1.1 material compositions

Epoxy resin E-42, aliphatic acid, HMW conditioning agent, silicone intermediate, methyl methacrylate (MMA), butyl acrylate (BA), methoxyl group polyvinyl alcohol methacrylate (MAA) hydroxy-ethyl acrylate (HEA), surfactant, initator, mixes nonhazardous solvent and is industrial goods.

1.2 resins are for the weight (kg) of each component used

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

1.3 synthesis technique

(1) load weighted aliphatic acid is dropped in reactor, add epoxy resin, molecular weight regulator and partial solvent, carry out esterification in 150-160 DEG C, in the time that acid value is down to 40mgKOH/g, be considered as esterification terminal, reaction system is cooled to room temperature;

(2) in reactor, add silicone intermediate, surfactant, alcohol ethers environmental protection mixed solvent to stir temperature rising reflux, drip acrylic monomers and initator, 3h drips off; insulation 1h, adds initator and is incubated 1h, discharging again; neutralization, the water-base resin liquid of deionized water dilution solids content 40%.

The detection index of 1.4LH-302 resin

Project	Index	Testing result
			Outward appearance	Emulsion	Meet
Non-volatile content (%)	40±2	40
			Viscosity (mPa.s)	≤400	380
VOC（%，≤）	8.5	8.5
			PH value	7.5～9	8.3
Water-thinned	Infinite dilution	Meet
			Freeze-thaw stability	Never degenerate	Meet
Particle charge	Anion	Anion

Embodiment 2, preparation water-based lacquering finished product

2.1 main raw material(s) material compositions

LH-302 resin (self-control), carbon black (6#), iron oxide black, modification aluminium triphosphate, organic nitrogen zinc salt, ultra-fine color stuffing, modified filler, various auxiliary agent and deionized water are industrial goods.

2.2 aqueous automobile chassis corrosion resistant coating each component weight (kg)

2.3 lacquering production technologies

(1) by deionized water, wetting dispersing agent, defoamer, levelling agent, mix, then add part resin liquid, regulate pH value to 8.5-9.0;

(2) under agitation, add pigment, filler, after high speed dispersion 1-1.5h, with 80 mesh sieves filtrations, the material of filtration enters sand mill circular grinding to fineness≤25u, discharging, outlet material temperature≤60 DEG C;

(3) material that fineness of grind is qualified adds to adjust to be converted in still, and adds the rest materials in formula, stirs evenly with the high speed of 1250～2000r/min;

(4), after stirring evenly, adjust viscosity to 70-110KU by deionized water, pH value-10, then with 200 order vibratory sieves filtrations, pack.

Wherein, modified filler is to be prepared and obtained by following method: a. takes off the raw material of row weight portion: kaolin 140, calcium carbonate 125, zeolite 11, nano-sized carbon 2, tungstic acid 1, lanthana 2, peppermint essential oil 2, sodium perborate 2, aluminium oxide 2, precipitation method barium sulfate 32, Tea Polyphenols 4, triethyl citrate 2, titanate coupling agent TMC-TTS5, jade powder 2;

B, kaolin, calcium carbonate, zeolite are calcined to 4-5h at 450-480 DEG C, be cooled to room temperature, after taking-up, add in the sodium hydroxide solution of 3-4% and grind 1-2 hour, then, add the hydrochloric acid solution of 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 residual components, and even with the high speed dispersion of 8000-10000 rev/min, to obtain final product.

2.4 lacquering assays

Claims (1)

1. an aqueous automobile chassis corrosion resistant coating, is characterized in that, its component by following weight portion is made:

LH-302 resin 48-52, carbon black 2.0-2.5, iron black 7-9, modification aluminium triphosphate 12-13, organonitrogen compound zinc salt 1-3, modified filler 9-11, wetting dispersing agent 0.3-0.5, corrosion inhibiter 0.8-1.0, ground wetting agent 0.3-0.5, auxiliary agent 0.1-2.0, deionized water 10-12;

The preparation method of described LH-302 resin is:

(1) take by weight following component: epoxy resin E427-9, aliphatic acid 15-17, molecular weight regulator 0.1-0.3, silicone intermediate 3-5, methyl methacrylate 18-20, butyl acrylate 8-9, methoxy polyethylene glycol methacrylate-styrene polymer 2-4, hydroxy-ethyl acrylate 2-4, neopelex 2-4, benzoyl peroxide 0.5-0.7, mixed solvent 35-38;

(2) aliphatic acid is dropped in reactor, add epoxy resin, molecular weight regulator and partial solvent, carry out esterification in 150～160 DEG C, in the time that acid value is down to 30～50mgKOH/g, be considered as esterification terminal, be cooled to room temperature;

(3) in reactor, add silicone intermediate, surfactant, mixed solvent to stir and be warming up to backflow, drip again acrylic monomers and part initator, 2.5-3.2h drip off, insulation 1-1.5h, continues to drip remaining initator, is incubated 1.0-1.2h simultaneously again, discharging, regulate pH to neutral, be diluted to the water-base resin liquid of solids content 40% by deionized water, be LH-302 resin;

Described modified filler is to be prepared and obtained by following method:

A. take off the raw material of row weight portion: kaolin 100-150, calcium carbonate 120-130, zeolite 10-12, nano-sized carbon 1-2, tungstic acid 1-2, lanthana 2-3, peppermint essential oil 2-3, sodium perborate 1-2, aluminium oxide 2-3, precipitation method barium sulfate 30-34, Tea Polyphenols 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 DEG C, be cooled to room temperature, after taking-up, add in the sodium hydroxide solution of 3-4% and grind 1-2 hour, then, add the hydrochloric acid solution of 12-15%, regulating 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 residual components, and even with the high speed dispersion of 8000-10000 rev/min, to obtain final product;

Described auxiliary agent is selected from one or more in levelling agent, defoamer, drier, thickener;

The production method of described aqueous automobile chassis corrosion resistant coating, comprises the following steps:

(1) deionized water, wetting dispersing agent, defoamer, levelling agent are mixed, then add part resin liquid, regulate pH value to 8.5-9.0;

(2) under agitation, add pigment, filler, after high speed dispersion 1-1.5h, with 80 mesh sieves filtrations, the material of filtration enters sand mill circular grinding to fineness≤25 μ m, discharging, outlet material temperature≤60 DEG C;

(3) material that fineness of grind is qualified adds to adjust to be converted in still, and adds the rest materials in formula, stirs evenly with the high speed of 1250～2000r/min;

(4), after stirring evenly, adjust viscosity to 70-110KU by deionized water, pH value 10, then with 200 order vibratory sieves filtrations, pack.