Summary of the invention
The object of the present invention is to provide the cryogenic coating of a kind of ability;
The priming paint that provides a kind of energy and above-mentioned low-temperature resistant coating to be used is provided another purpose of the present invention;
A further object of the present invention is to provide a kind of method for preparing low-temperature resistant coating of the present invention.
The consisting of of low-temperature resistant coating of the present invention (% weight):
Water 16-20%
Film coalescence aid 1.6-2.0%
Dispersion agent 0.3-1%
Ethylene glycol 1.5-1.8%
1200 purpose Calucium Silicate powder 4-5%
Titanium dioxide 12-15%
1200 purpose coarse whiting 3-5%
1200 purpose talcum powder 3-5%
Thickening material (1: 1 aqueous solution) 2-4%
Defoamer 0.02%
Pure acrylic acid emulsion 37-43%
Multifunctional assistant 0.1-0.3%
Mould inhibitor 0.1-0.3%
Self-crosslinking elastomeric propylene yogurt liquid 7-10%
Nano-class zinc oxide coagulant liquid 0.08%
Described film coalescence aid selects alcohol ester-12, and its effect is to be lowered into film temperature, improves film forming properties.
The poly carboxylic acid ammonium that described dispersion agent preferably adopts Henkel Corp. to produce, its effect is to impel pigment, fillers dispersed.Coarse whiting, talcum powder and ultra-fine calcium silicate powder are fillers, and its fineness is respectively 1200 orders, 1200 orders and 1200 orders.
VD-S modified polypropene acid sodium aqueous solution or SN-636 hydrophobically modified alkali swelling emulsion that described thickening material adopts Henkel Corp. to produce.
Described defoamer is the SN-154 defoamer of 681F or non-ionic type.
Described pure acrylic acid emulsion is selected from 371, AD261,820 type pure acrylic acid emulsions.
Described self-crosslinking elasticity pure acrylic acid emulsion is selected from 4104, AD36,163M, 2438 type ACRYLIC EMULSION, and it can improve the snappiness of dope layer.
Described multifunctional assistant is AMP-95, its role is to promote to disperse the pH value with regulation system.
Described mould inhibitor is HF, AD26, and its effect is a fungus and mildew resistance.
Low-temperature resistant coating of the present invention can not directly impose on the old metope, and must impose priming paint of the present invention earlier to reinforce and sealing basic unit on old metope, improves the viscosifying power of finish paint, just can use low-temperature resistant coating of the present invention then.The consisting of of described priming paint (% weight):
Resins, epoxy (618) 65-75%
Modified polyamide (WH-1000) 35-25%
When being coated with, will add the water dilution that 5-10 doubly contains 0.2-0.5% (weight) OP-10 then through above-mentioned component mixing in agitation vat of weighing earlier with this priming paint.The priming paint for preparing should use at once, requires to use up in 2 hours.Being coated with priming paint can roller coat low-temperature resistant coating of the present invention after 24 hours.
Low-temperature resistant coating of the present invention is preparation like this:
The aforementioned proportion of pressing low-temperature resistant coating composition of the present invention is with water, dispersion agent, ethylene glycol and film coalescence aid (liquid material) mix with 400-600 rev/min rotating speed, the titanium dioxide that adds 2/3 aforementioned proportion simultaneously, ultra-fine Calucium Silicate powder, coarse whiting and talcum powder (powder), after treating that above-mentioned powder is all moistening, mixing speed is carried to 1000-1100 rev/min, nano zine oxide coagulant liquid with aforementioned proportion drops in the above-mentioned mixed material again, and then with this material dispersed with stirring after 30-40 minute, mixing speed is reduced to 600 rev/mins and add the pure acrylic acid emulsion and the self-crosslinking elasticity pure acrylic acid emulsion of aforementioned proportion.After treating that above-mentioned material stirs, drip the thickening material of aforementioned proportion, after the material pH value is transferred to 8-9, add the multifunctional assistant of aforementioned proportion again, mould inhibitor and defoamer make the denseness of material reach 25-30 second, after this add remaining titanium dioxide.This material stirred and place after 40 minutes it is ground to fineness less than 40 μ m with three-roller.
The test plate (panel) that scribbles low-temperature resistant coating of the present invention is done-40 ℃, and after the atmospheric exposure test of 30 freezing and thawing tests and 500 hours, film coated surface is not seen foaming, cracking, efflorescence, is come off and metachromatism.
Further specify the present invention below by embodiment.
Embodiment 1
Get 286 parts of (weight, water, 12.6 parts of poly carboxylic acid ammoniums, 26.6 parts of ethylene glycol and 29 parts of alcohol esters-12 down together), stir and add 146 parts of titanium dioxides, 62 part of 1200 purpose coarse whiting, 60 part of 1200 purpose talcum powder and 62 part of 1200 ultra-fine calcium silicate powder of purpose (AS881) with 400-600 rev/min rotating speed, after adding above-mentioned powder agitator speed is brought up to 1000 rev/mins, drip 1.32 parts of nano zine oxide coagulant liquids.Disperse after 30-40 minute, agitator speed is reduced to 600 rev/mins, add (4104) 120 parts of 685 parts of pure acrylic acid emulsions (820) and self-crosslinking elasticity pure acrylic acid emulsions then, drip 44 parts of thickening materials (Henkel Corp. produce VD-S type modified polypropene acid sodium aqueous solution (1: 1)) and the pH value of above-mentioned compound is transferred to 8-9 add 3.7 parts of AMP-95 type multifunctional assistants, 0.2 part of HF mould inhibitor and 0.35 part of 681 type defoamer later on, the denseness that makes this compound is 25-30 second.Add 72 parts of titanium dioxides at last, compound is stirred, placed 40 minutes, it is ground to<fineness of 40 μ m with three-roller, the result obtains low-temperature resistant coating of the present invention, and it consists of (% weight):
Water 18.54%
Alcohol ester-12 1.8%
Poly carboxylic acid ammonium (5027 type) 0.82%
Ethylene glycol 1.7%
Ultra-fine Calucium Silicate powder (AS881 type, 1200 orders) 4%
Titanium dioxide (575 type) 14.1%
Coarse whiting (1200 order) 4.0%
Talcum powder (1200 order) 3.9%
VD-S modified polyacrylic acid sodium 2.8%
The aqueous solution (1: 1)
Pure acrylic acid emulsion (820) 44%
Nano zine oxide coagulant liquid 0.08%
Multifunctional assistant (AMP-95 type) 0.24%
Mould inhibitor (HF type) 0.2%
Self-crosslinking elastomeric propylene acid 7.8%
Emulsion (4104 type)
681F type defoamer 0.02%
The low-temperature resistant coating of gained is coated on the test plate (panel), presses the regulation of 5,14 among the DB23/T445-1998 this sample is done-40 ℃, 30 thawing circulations and atmospheric exposure test did not find on this plate that coating bubbles after 500 hours, and efflorescence is peeled off and metachromatism.
Put example 2 in fact
Again this diluted priming paint will be coated on the old metope of buildings after will meeting 7.1 times of the Resins, epoxy (618 type) of aforementioned priming paint proportion of composing and the dilutions of modified polyamide (WH-1000) mixed solution with 0.5% aqueous solution of OP-10.The low-temperature resistant coating that roller coat is made by the step of embodiment 1 on this prime coat after 24 hours.Be lower than winter of-40 ℃ through minimum temperature after, this coating is not seen and is peeled off and variable color.