CN102391761B

CN102391761B - Water base epoxy anticorrosion baking clear paint and preparation method thereof

Info

Publication number: CN102391761B
Application number: CN 201110367638
Authority: CN
Inventors: 张新民; 张春霞
Original assignee: Jihua 3522 Appliances and Decorations Co Ltd
Current assignee: Jihua 3522 Appliances and Decorations Co Ltd
Priority date: 2011-11-18
Filing date: 2011-11-18
Publication date: 2013-05-08
Anticipated expiration: 2031-11-18
Also published as: CN102391761A

Abstract

The invention relates to a water base epoxy anticorrosion baking clear paint and a preparation method thereof. Prepared base materials are weighed according to weight parts, placed in a stainless steel reaction kettle, stirred slowly from 300 round/min- 45 round/min gradually to 600 round / min, and added with a mixture of food grade ethanol and deionized water; the rotating speed is increased to 900 round / min gradually, and food grade phenolic resins is added; then the rotating speed is increased to 1300 round / min, and a shear time is 45 min; after fully dissolving, the stirring is stopped; and the base materials are treated with standing for 24 h to obtain a paint finished product. Compared with a foreign product of a same kind, the water base epoxy anticorrosion baking clear paint for food grade metal inner wall of the invention is superior to the foreign product in terms of physical and chemical indexes, construction environment conditions and price.

Description

Water base epoxy anticorrosion baking clear paint and preparation method thereof

Technical field

The invention belongs to chemical field, relate to the undercoat of metal food container, especially a kind of Water base epoxy anticorrosion baking clear paint and preparation method thereof.

Background technology

At present, for the undercoat coating non-refractory of metal food container, can't splendid attire soda pop or alcohol product.Although and external product is more excellent than existing home products, at film forming, outward appearance and execution conditions, in price, all be unsuitable for domestic use, do not reach GB/T5750-2006 " the drinking water standard method of inspection " set quota yet.Therefore, develop a kind of at product physical and chemical index, construction environment condition and equal excellent product in price, very necessary.

By retrieval, not yet find the publication document identical with present patent application.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art part, provide that a kind of quality is good, price is low, the Water base epoxy anticorrosion baking clear paint of stable performance and preparation method thereof.

For solving the problems of the technologies described above, the present invention adopts following technical proposal:

A kind of Water base epoxy anticorrosion baking clear paint, its raw material consists of and parts by weight are respectively:

And the preparation method's of described base-material step is:

(1) with dipropylene glycol methyl ether, insert in stainless steel cauldron and stir;

(2) the can special epoxy resin slowly adds in dipropylene glycol methyl ether liquid according to the weight ratio ratio of 1: 1 and stirs, and stops stirring during 90～100 ℃ of temperature in the kettle, and under the environment of 23 ± 2 ℃ of temperature, cooling standing 12h ± 1 obtains base material mixture;

(3) base material mixture is incorporated as the tributyl phosphate of its weight 8% and is the AGE emulsifying agent of its weight 2%, carry out 1600～1800 rev/mins of emulsifications under high-speed stirring, after stirring 1.5-2.5h thoroughly mixed, base-material was the viscous emulsion shape, then adds the mixing liquid that concentration is 18% ethanol and deionized water, in the time of 25 ± 1 ℃, standing 24h is without precipitate, evenly without sedimentation, demulsifying phenomenon, filter with 120 order vibratory screening apparatuss, namely get the base-material finished product.

And, the weight ratio of the mixing liquid of described ethanol and deionized water:

Ethanol: deionized water=7.2: 10.8.

A kind of preparation method of Water base epoxy anticorrosion baking clear paint, step is:

Insert in stainless steel cauldron after according to parts by weight, made base-material being weighed, slow starting stirred 300 rev/mins-45 rev/mins by rising to 600 rev/mins, then add food grade ethanol and deionized water, rotating speed is risen to 900 rev/mins, add food grade resol, then rotating speed is risen to 1300 rev/mins, shear time 45min after fully mixing, stops stirring, standing 24h namely gets the coating finished product.

Embodiment

Below in conjunction with embodiment, the present invention is further set forth, but the scope of protection of present invention is not limited to following embodiment.

A kind of Water base epoxy anticorrosion baking clear paint, its raw material constitutes:

At first the below narrates the preparation method of base-material, and step is:

1, dipropylene glycol methyl ether (liquid water oil cosolvent) is accurately weighed after, insert in stainless steel cauldron and stir;

2, can special epoxy resin (solid) is accurately weighed after, slowly add in dipropylene glycol methyl ether liquid and stir according to the weight ratio ratio of 1: 1, stop stirring when 90～100 ℃ of temperature in the kettle, cooling is under the environment of 23 ± 2 ℃ of temperature, cooling standing 12h obtains base material mixture.

Above-mentioned base material mixture is water-white transparent liquid (machinery-free impurity), without the suspension settlement thing), base-material viscosity (with the rotary viscosity instrumentation) 7800～8300cp (centipoise).Get base-material 10g and insert in 120 ℃ of constant temperature ovens and toast 1.5h in the time of 23 ± 2 ℃, take out and weigh after being cooled to room temperature 30min, survey solids content 50 ± 2%, with the index of ensuring the quality of products.

3, emulsification: above-mentioned base material mixture is incorporated as the tributyl phosphate of its weight 8% and is the AGE emulsifying agent of its weight 2%, carry out 1600～1800 rev/mins of emulsifications under high-speed stirring, stir and note in the 2h process observing, the base-material that thoroughly mixes is the viscous emulsion shape, then add the mixing liquid that concentration is 18% ethanol and deionized water, and wherein (ethanol: deionized water=7.2: 10.8 (weight ratio), in the time of 25 ± 1 ℃, with rotational viscosimeter viscosimetric 1070cp (centipoise), Ford 4 ^#Cup 270s, solids content 39 ± 1%, standing 24h without precipitate, evenly without phenomenons such as sedimentation, breakdowns of emulsion, filters with 120 order vibratory screening apparatuss, namely gets the base-material finished product.

A kind of preparation method of Water base epoxy anticorrosion baking clear paint, particular content is:

After being weighed, 80 parts of made base-materials insert in stainless steel cauldron, slow starting stirred 300 rev/mins, and 45 rev/mins by rising to 600 rev/mins, then adds 12 parts of 8 parts of food grade ethanol and deionized waters, rotating speed is risen to 900 rev/mins, add 2 parts, food grade resol, then rotating speed is risen to 1300 rev/mins, shear time 45min, after fully mixing, stop stirring, standing 24h namely gets the coating finished product.

The coating end properties detects:

Observe: condition in container, emulsion form, consistency is good; Without precipitate, breakdown of emulsion not.

Intermediate detection: survey paint fluid viscosity 200cp (centipoise) for 25 ± 1 ℃, Ford 4# cup 50s claims solid, content 34.5 ± 1% after claiming 10g to put into 120 ℃ of baking oven baking 1.5h.

The performance characteristics of coating sees Table 1

Table 1

Experimental technique

Experiment condition: the regulation that experimental state is regulated and the experimental situation condition is pressed in GB9728 is carried out; The general preparation method of filming is carried out by the regulation in GB/T1727.The state of coating in container undertaken by the regulation in GB/T1729; The paint viscosity assay method is undertaken by the regulation in GB/T1723; Coating fineness assay method is undertaken by the regulation in BG/T1724; Film, putty membrane assay method time of drying undertaken by the regulation in GB/T1728; The hardness of film assay method is undertaken by the regulation in GB/T1730; The snappiness of filming assay method is undertaken by the regulation in GB/T1731; Smearing the shock-resistance assay method is undertaken by the regulation in GB/T1732; The film adhesive assay method is undertaken by the regulation in GB/T1720; The water-resistance property of coating assay method is undertaken by the regulation in GB/T1733; The humidity resistance assay method of filming is undertaken by the regulation in GB/T1740; The mensuration of the anti-neutral salt spray performance of paint and varnish is undertaken by the regulation in GB/T1771; The ageing-resistant measuring of filming is undertaken by the regulation in GB/T1865.

Attention: according to the service requirements of this coating, used varnish and colored paint superageing tester with ZWD1-500 UV-lamp Continuous irradiation 6 hours in mensuration, the slight loss of gloss but its use properties is constant of filming.(ZWD1-500 UV-lamp Continuous irradiation was equivalent to outdoor weather aging 1 year in 2 hours.)

The contrast test and appraisal:

Contrast coating: Germany produces water base property epoxies, quantity 20L

Table 2: unit: L

(be applicable to Newtonian fuid, 25 ℃, density=1)

The contrast evaluating result:

Table 3

Illustrate:

Sequence number (1.1～1.2), sequence number (2.1～2.2) are the original coating of check.

Sequence number (1.3～1.9), sequence number (2.3～2.9) they are with long 12cm * 4cm aluminum alloy sheet, 25 ± 1 ℃ of envrionment temperatures. will paint fluid viscosity with spraying method and be adjusted to 28s (latting drown deionized water) spraying twice, build 10 μ m carry out.

Conclusion:

1, it is on the low side that Germany produces the clear solids coatings of water base property epoxies food product containers inwall oven dry, proves that its filmogen is on the low side, the wet film after spraying with 155 ± 2 ℃ of baking 20min after, Germany produces the coating its colour changed into yellow of filming; The no abnormality seen and coating of the present invention is filmed is still water white transparent.After 230 ℃ of baking 30min of super oven test, coating of the present invention is filmed and is still met the technical indicator regulation.

2, Germany produces coating and films and come off at boiling resistance (1h in 100 ℃ of boiling water), the coating of the present invention no abnormality seen of filming.

Execution conditions:

It must be to construct under 25 ℃ of (constant temperature) conditions in envrionment temperature that Germany produces coating, and this coating can be in 5～50 ℃ of envrionment temperatures (coated article temperature)) construct under condition.

Price (Renminbi): Germany produces 300 yuan/L of coating, 58 yuan/L of coating of the present invention, and price is higher than 5.17 times on year-on-year basis, and painting cost strengthens.

To sum up, compare with same kind of products at abroad, reach in price in product physical and chemical index, construction environment condition, the clear coating of this water base property metallic food grade inwall epoxy corrosion protection oven dry is better than its external product.

Claims

1. Water base epoxy anticorrosion baking clear paint is characterized in that: its raw material consists of and parts by weight are respectively:

The preparation method's of described base-material step is:

⑴ insert dipropylene glycol methyl ether in stainless steel cauldron and stir;

⑵ can special epoxy resin slowly adds in dipropylene glycol methyl ether liquid according to the ratio of weight ratio 1:1 and stirs, and stops stirring during 90～100 ℃ of temperature in the kettle, and under the environment of 23 ± 2 ℃ of temperature, cooling standing 12h ± 1h obtains base material mixture;

⑶ base material mixture is incorporated as the tributyl phosphate of its weight 8% and is the AGE emulsifying agent of its weight 2%, carry out 1600～1800 rev/mins of emulsifications under high-speed stirring, after stirring 1.5-2.5h and thoroughly mixing, base-material is the viscous emulsion shape, then adds concentration and be 18% ethanol and the mixing liquid of deionized water, in the time of 25 ± 1 ℃, standing 24h is without precipitate, evenly without sedimentation, demulsifying phenomenon, filter with 120 order vibratory screening apparatuss, namely get the base-material finished product;

Described ethanol: deionized water=7.2:10.8.