CN102391761A - Water base epoxy anticorrosion baking clear paint and preparation method thereof - Google Patents

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

Clear coating and preparation method thereof is dried in the corrosion protection of water base property epoxy

Technical field

The invention belongs to chemical field, relate to the undercoat of metal food container, clear coating and preparation method thereof is dried in the corrosion protection of especially a kind of water base property epoxy.

Background technology

At present, for the undercoat coating non-refractory of metal food container, can't splendid attire soda pop or alcohol product.Though and external product is more excellent than existing home products, at film forming, outward appearance and execution conditions, in price, all be inappropriate 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 all excellent in price product, very necessary.

Through retrieval, do not find the publication document identical as yet with present patent application.

Summary of the invention

The objective of the invention is to overcome the weak point of prior art, provide that a mass is good, price is low, clear coating and preparation method thereof is dried in the water base property epoxy corrosion protection of stable performance.

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

Clear coating is dried in the corrosion protection of a kind of water base property epoxy, and its raw material constitutes and parts by weight are respectively:

And the preparing method's of said base-material step is:

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

(2) the can special epoxy resin slowly adds in the dipropylene glycol methyl ether liquid according to 1: 1 ratio of weight ratio and stirs, and stops to stir during 90～100 ℃ of temperature in the kettle, and under the environment of 23 ± 2 ℃ of temperature, 12h ± 1 is left standstill in cooling, 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%, under high-speed stirring, carries out 1600～1800 rev/mins of emulsifications, after stirring 1.5-2.5h thoroughly mixes; Base-material is the viscous emulsion shape, adds the mixing liquid that concentration is 18% ethanol and deionized water then, in the time of 25 ± 1 ℃; Leave standstill 24h, no precipitate does not evenly have sedimentation, demulsifying phenomenon; Filter with 120 order vibratory screening apparatuss, promptly get the base-material finished product.

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

Ethanol: deionized water=7.2: 10.8.

The preparation method of clear coating is dried in the corrosion protection of a kind of water base property epoxy, and step is:

Insert in the 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, adds food grade ethanol and deionized water then; 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 to stir; Leave standstill 24h, promptly get the coating finished product.

Embodiment

To combine embodiment that the present invention is further set forth below, but the scope that the present invention requires to protect is not limited to following embodiment.

Clear coating is dried in the corrosion protection of a kind of water base property epoxy, and its raw material constitutes:

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

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

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

Above-mentioned base material mixture is water-white transparent liquid (not having mechanical impurity), no suspension settlement thing), base-material viscosity (with the rotary viscosity instrumentation) 7800～8300cp (centipoise).In the time of 23 ± 2 ℃, get base-material 10g and insert in 120 ℃ of constant temperature ovens and toast 1.5h, 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%, under high-speed stirring, carry out 1600～1800 rev/mins of emulsifications, stir and note in the 2h process observing; The base-material that thoroughly mixes is the viscous emulsion shape; Add the mixing liquid that concentration is 18% ethanol and deionized water then, 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% leaves standstill 24h, and no precipitate does not evenly have phenomenons such as sedimentation, breakdown of emulsion, filters with 120 order vibratory screening apparatuss, promptly gets the base-material finished product.

The preparation method of clear coating is dried in the corrosion protection of a kind of water base property epoxy, and particular content is:

Insert in the stainless steel cauldron after 80 parts of made base-materials are weighed, slow starting stirred 300 rev/mins, and 45 rev/mins by rising to 600 rev/mins; Add 12 parts of 8 parts of food grade ethanol and deionized waters then, rotating speed is risen to 900 rev/mins, add 2 parts in food grade resol; Then rotating speed is risen to 1300 rev/mins, shear time 45min is after fully mixing; Stop to stir, leave standstill 24h, promptly get the coating finished product.

The coating end properties detects:

Observe: condition in container, emulsion form, consistency is good; No precipitate, not breakdown of emulsion.

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

The performance characteristics of coating is seen table 1

Table 1

Experimental technique

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

Attention: according to the request for utilization of this coating, used varnish and colored paint superageing tester in the mensuration, the slight loss of gloss but its use properties is constant of filming with ZWD1-500 UV-lamp continuously irradiating 6 hours.(ZWD1-500 UV-lamp continuously irradiating 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

Explain:

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 coat with lacquer fluid viscosity with spraying method and be adjusted to 28s (latting drown is used deionized water) spraying twice, build 10 μ m carry out.

Conclusion:

1, Germany produces water base property epoxies food product containers inwall to dry clear solids coatings on the low side, proves that its filmogen is on the low side, the wet film after the 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, it is transparent to be still water white.Behind 230 ℃ of bakings of ultra oven test 30min, 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 the 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 external like product, reach in price in product physical and chemical index, construction environment condition, this water base property metal matter food grade inwall epoxy corrosion protection is dried clear coating and is superior to its external product.

Claims (4)

1. clear coating is dried in water base property epoxy corrosion protection, it is characterized in that: its raw material constitutes and parts by weight are respectively:

2. clear coating is dried in water base property epoxy according to claim 1 corrosion protection, and it is characterized in that: the preparing method's of said base-material step is:

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

(2) the can special epoxy resin slowly adds in the dipropylene glycol methyl ether liquid according to 1: 1 ratio of weight ratio and stirs, and stops to stir during 90～100 ℃ of temperature in the kettle, and under the environment of 23 ± 2 ℃ of temperature, 12h ± 1 is left standstill in cooling, 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%, under high-speed stirring, carries out 1600～1800 rev/mins of emulsifications, after stirring 1.5-2.5h thoroughly mixes; Base-material is the viscous emulsion shape, adds the mixing liquid that concentration is 18% ethanol and deionized water then, in the time of 25 ± 1 ℃; Leave standstill 24h, no precipitate does not evenly have sedimentation, demulsifying phenomenon; Filter with 120 order vibratory screening apparatuss, promptly get the base-material finished product.

3. clear coating is dried in water base property epoxy according to claim 2 corrosion protection, it is characterized in that: the weight ratio of the mixing liquid of said ethanol and deionized water:

Ethanol: deionized water=7.2: 10.8.

4. the preparation method of clear coating is dried in a water base property epoxy as claimed in claim 1 corrosion protection, and it is characterized in that: step is:

Insert in the 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, adds food grade ethanol and deionized water then; 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 to stir; Leave standstill 24h, promptly get the coating finished product.