CN1164702C - Aqueous paint - Google Patents

Abstract

The present invention relates to aqueous paint capable of improving the heat exchanging effectiveness and the corrosive resistance of a heat exchanger of an air conditioner. The aqueous paint comprises primer pint and surface paint and adopts a dual-coating layer method of which the specific formula is disclosed in the specification. The present invention has the advantages that the primer paint and the surface paint must be combined for use and can not be used singly, and the surface paint realizes hydrophilicity because of corrosion resistance and adhesive force provided by the primer paint; thus, the heat exchange effectiveness and the corrosion resistance of a heat exchanger can be enhanced. Simultaneously, the present invention has the advantages of strong adhesive force, good resistance to alkali and salt-fog, volume reduction of the air conditioner and extension of service life.

Description

Water-borne coatings

Technical field

The present invention relates to industrial used coating, specifically relate to a kind of water-borne coatings that improves air-condition heat exchanger heat exchange efficiency and preservative property.

Background technology

Along with socioeconomic continuous progress, air conditioning machinery has more and more become a kind of requisite industry and civilian commodity, because the interchanger of air conditioning machinery is to make with aluminum, how on aluminum, to improve heat exchange efficiency and preservative property, this is extremely important work-ing life to miniaturization of conditioner volume and prolongation air-conditioning, therefore, seeking a kind of coating and be used for aluminium, is one of people's problem anxious to be solved.

Chinese patent publication number CN 1267571A has disclosed a kind of aluminium carbonated drink treatment process, used end agent and hydrophilic coating.The hydrophilic coating of the aluminium hydrophilic treatment that this invention is related is with polyvinyl alcohol (PVA) and polyoxyethylene glycol (PEG) or is the PVA/PEG multipolymer, and the content range of polyvinyl alcohol is 30～150 gram/L, and the content range of polyoxyethylene glycol is 3～40 gram/L.

Some and for example external inventions have disclosed a kind of chemical coating and a kind of by organic polymer that has as Japanese patent application publication No. 61-250495, as the resin-coated aluminium radiator fin that can provide cationic water soluble polyamide to make when soluble in water.

Japanese patent application publication No. 63-57674 has disclosed a kind of a kind of water soluble resin composite that contains for another example, as the hydrophilic coating agent of a kind of water-soluble nylon, a kind of alkalimetal silicate and amino alcohol.

Although above-mentioned patent is all mentioned the preservative property and the wetting ability on interchanger top layer, all also do not satisfy industrial production requirement fully, or antiseptic property is good and reduced wetting ability; Hydrophilicity is good, and corrosion resistance nature is relatively poor.

Summary of the invention

The objective of the invention is to overcome above-mentioned the deficiencies in the prior art part, and provide preparation not too complicated, effective water-borne coatings.

The object of the invention can realize by following measure: water-borne coatings, comprise primer base and finish paint coating, and adopt two coatings, primer base and finish paint coating are used in combination, and are coated with priming earlier on aluminium, and then overpainting, and wherein primer base comprises:

(A) but a kind of water dissipating resin composition comprise:

(a) the acrylic resin polymer emulsion of 20%～60% weight,

(b) the water soluble resin solidifying agent of 10%～20% weight,

(B) anticorrosive agent of 0.1～0.4% weight,

(C) aqueous color paste of 0.06～0.1% weight,

(D) the water-based defoamer of 0.2～1.0% weight,

(E) the water-based flow agent of 0.3～1.0% weight,

(F) cellosolve of 5～20% weight,

(G) the rest part water supplies 100%;

Finish paint coating comprises:

(A) a kind of aqueous resin composition comprises:

(a) water soluble acrylic resin's polymkeric substance of 20～60% weight,

(b) the PVP resinous polymer of 0～10% weight,

(c) the water soluble amino resin polymkeric substance of 0～15% weight,

(d) water-soluble nylon of 0～3% weight,

(e) PVA of 0～3% weight,

(B) silicon sol of 1～10% weight,

(C) tensio-active agent of 0.1～10% weight,

(D) cellosolve of 5～20% weight,

(E) the rest part water supplies 100%.

The acrylic resin polymkeric substance can be benzene emulsion, vinyl acetate emulsion and pure-acrylic emulsion, but any polymer emulsion of while all should contain the activity reactive group of certain number.

The water soluble resin solidifying agent can be the water-based isocyanate of water miscible aminoresin, resol, urea-formaldehyde resin and sealing.The effect of these resins is to improve the cross-linking density of resin when being heating and curing, thereby improves the erosion resistance of coating.

Anticorrosive agent is in order to improve anti-erosion and the long-term erosion resistance of dodging.

Aqueous color paste is used so that coating is painted.

PVP is a Polyvinylpyrolidone (PVP), and PVA is a polyvinyl alcohol, alcoholysis degree 98%, and the polymerization degree is greater than 3000.

The present invention has following advantage compared to existing technology: because the present invention adopts two coatings on aluminium, priming paint provides protection against corrosion and sticking power, finish paint is realized wetting ability, and having solved water droplet is bridge formation problem between the heat exchanger fin at interchanger, make water droplet on the surface, scatter, improved heat exchange efficiency, and solved the preservative property problem simultaneously at once, and this product strong adhesion, alkali resistance and salt fog resistance are good, and priming paint and finish paint must be used in combination, and can not use finish paint or priming paint separately.

Embodiment

Enumerate each 10 embodiment of priming paint and finish paint below, the present invention is further specified.

One, priming paint

Embodiment 1

In the stainless steel still, be 125 jin by listed proportion of raw material SDR318 in the table 1,100 jin of hexa methoxy melamine formaldehyde resin curing agent HMMM, anticorrosive agent Cibal405,2 jin of Cibas, 0.4 jin of the blue mill base of water-based, 2.5 jin of water-based flow agents, 100 jin of ethylene glycol butyl ethers, 2.5 jin of water-based defoamers, 167.6 jin of deionized waters, totally 500 jin, temperature 5-30 ℃, stir half an hour, promptly get this product.

Embodiment 2

Working method is with embodiment 1, different is, 75 jin of solidifying agent HMMM, 25 jin in water soluble phenol resin solidifying agent, replace the corresponding two kinds of raw material consumptions among the embodiment 1, in embodiment 2-10, SDR318, anticorrosive agent, aqueous color paste, water-based flow agent, ethylene glycol butyl ether, water-based defoamer, deionized water consumption are all identical with embodiment 1.

Embodiment 3

Working method is with embodiment 1, and different is 50 jin of solidifying agent HMMM, 50 jin in water soluble phenol resin solidifying agent, the corresponding two kinds of raw material consumptions among the replacement embodiment 1.

Embodiment 4

Working method is with embodiment 1, and different is 25 jin of solidifying agent HMMM, 75 jin in water soluble phenolic resin solidifying agent, the corresponding two kinds of raw material consumptions among the replacement embodiment 1.

Embodiment 5

Working method is with embodiment 1, and different is that 100 jin in water soluble phenolic resin solidifying agent replaces the curing dose among the embodiment 1, does not contain solidifying agent HMMM in the present embodiment.

Embodiment 6-10

Working method is with embodiment 1, and different is 50 jin in solidifying agent, 50 jin in water soluble phenolic resin solidifying agent, the corresponding two kinds of raw material consumptions among the replacement embodiment 1.

Two, finish paint

Embodiment 1-5, embodiment 7

The same priming paint of working method, different is, and SDR 500 is 200 jin, and PVP is 25 jin, HMMM50 jin, 10 jin of silicon sol, 5 jin of AES, 50 jin of ethylene glycol butyl ethers, 160 jin of deionized waters, replace raw material among the embodiment 1 by totally 500 jin.

Embodiment 6

Working method is with embodiment 7, and that different is 75 jin of HMMM, replaces PVP and HMMM among the embodiment 7, and all the other raw material consumptions are identical with embodiment 7.

Embodiment 8

Working method is with embodiment 7, and different is PVP50 jin, 25 jin of HMMM, corresponding two the raw material consumptions among the replacement embodiment 7.

Embodiment 9

Working method is with embodiment 7, and different is, 5 jin of silicon sol replace embodiment 1-5, the silicon sol amount in 7, and all the other raw materials are all identical with this embodiment.

Embodiment 10

Working method is with embodiment 7, and SDR500 is 200 jin, 50 jin of PVP, 10 jin of silicon sol, AES0.5 jin, 50 jin of ethylene glycol butyl ethers, 189.5 jin of deionized waters, totally 500 jin.

Below priming paint and finish paint formulation for coating material are listed in table one, table two.

Table one:

	Embodiment 1	Embodiment 2	Embodiment 3	Embodiment 4	Embodiment 5
						The primer base prescription
Title material	Ratio	Ratio	Ratio	Ratio	Ratio
						(A) water dispersed resin composition:
(a)SDR318(30％，W/W) (1)	25	25	25	25	25
						(b1) solidifying agent (2)	20	15	10	5	0
(b2) solidifying agent (3)	0	5	10	15	20
						(B) anticorrosive agent (4)	0.4	0.4	0.4	0.4	0.4
(C) aqueous color paste (5)	0.08	0.08	0.08	0.08	0.08
						(E) water-based flow agent (6)	0.5	0.5	0.5	0.5	0.5
(F) ethylene glycol butyl ether (7)	20	20	20	20	20
						(D) water-based defoamer (8)	0.5	0.5	0.5	0.5	0.5
(G) deionized water	33.52	33.52	33.52	33.52	33.52
						Total amount	100	100	100	100	100
The finish paint formulation for coating material
						Title material	Ratio	Ratio	Ratio	Ratio	Ratio
(A) aqueous resin composition
						(a)SDR500(25％，W/W) (9)	40	40	40	40	40
(b)PVP (10)	5	5	5	5	5
						(c)HMMM (2)	10	10	10	10	10
(B) silicon sol (11)	2	2	2	2	2
						(C)AES (12)	1	1	1	1	1
(D) ethylene glycol butyl ether (13)	10	10	10	10	10
						(E) deionized water	32	32	32	32	32
Total amount	100	100	100	100	100

Table two:

	Embodiment 6	Embodiment 7	Embodiment 8	Embodiment 9	Embodiment 10
						The primer base prescription
Title material	Ratio	Ratio	Ratio	Ratio	Ratio
						(A) water dispersed resin composition
(a)SDR318(30％，W/W) (1)	25	25	25	25	25
						(b1) solidifying agent (2)	10	10	10	10	10
(b2) solidifying agent (3)	10	10	10	10	10
						(B) anticorrosive agent (4)	0.4	0.4	0.4	0.4	0.4
(C) aqueous color paste (6)	0.08	0.08	0.08	0.08	0.08
						(E) water-based flow agent (6)	0.5	0.5	0.5	0.5	0.5
(F) ethylene glycol butyl ether (7)	20	20	20	20	20
						(D) water-based defoamer (8)	0.5	0.5	0.5	0.5	0.5
(G) deionized water	33.52	33.52	33.52	33.52	33.52
						Total amount	100	100	100	100	100
The finish paint formulation for coating material
						Title material	Ratio	Ratio	Ratio	Ratio	Ratio
(A) aqueous resin composition
						(a)SDR500(25％，W/W) (9)	40	40	40	40	40
(b)PVP (10)	0	5	10	5	10
						(c)HMMM (2)	15	10	5	10	0
(B) silicon sol (11)	2	2	2	1	2
						(C)AES (12)	1	1	1	1	0.1
(D) ethylene glycol butyl ether (13)	10	10	10	10	10
						(E) deionized water	32	32	32	33	37.9
Total amount	100	100	100	100	100

The raw material explanation:

(1) benzene emulsion, SDR318, Seedy chemicals Co., Ltd.

(2) Cytec 303, hexa methoxy melamine formaldehyde resin (HMMM), the special company of cyanogen

(3) water soluble phenol resin, Institute of Chemistry, Academia Sinica

(4) anticorrosive agent, Ciba 1405, Ciba

(5) the blue look mill base of water-based, CLARIANT A ₂R

(6) water-based flow agent, China Pentium company

(7) ethylene glycol butyl ether, DOW company

(8) water-based defoamer, BOUR ^-FORM2989LHS, AEC company

(9) water-soluble acrylic copolymer's resin solution, SDR500, Seedy chemicals Co., Ltd.

(10) Polyvinylpyrolidone (PVP), K-30, south, Hangzhou Hangzhoupro industry and trade company limited

(11) silicon sol, 20 nanometers, people chemical plant, Guangzhou

(12) tensio-active agent, commercially available

(13) ethylene glycol butyl ether, DOW company

The primer base of above-mentioned preparation can be constructed in aluminium foil surface by the mode of roller coating, blade coating, showering or dip-coating, the control wet coating thickness is at 2～6 μ m, 290 ℃/20～30 " oven dry; the switchboard temperature is at 224～232 ℃; after treating its cooling, construction finish paint coating, the control wet coating thickness is at 2～6 μ m; 290 ℃/20～30 " oven dry, the switchboard temperature is at 224～232 ℃.

Coating performance is estimated:

The index such as alkali resistance, salt fog resistance, initial stage wetting ability, protracted hydrophilicity, sticking power that is primarily aimed at coating is investigated and is estimated.Process and result are as follows:

(1) alkali resistance: the 20%NaOH aqueous solution, 3 minutes;

A, no bubble

B, indivedual bubble

C, a small amount of bubble

D, a large amount of bubble

(2) salt fog resistance: 5%NaCl, 40 ℃, 500 hours;

A, more than 9.8 grades

B, 9.5～9.8 grades

C, 9.0～9.8 grades

D, below 9.0 grades

(3) initial stage wetting ability: the size of coming hydrophilic contact angle of evaluation initial stage (θ) with the diameter of diffusion (φ) within the 5 μ L water droplets 1 minute

A、θ＜3°(φ＞7.0mm)

B、6.5mm＜φ＜7.0mm

C、6.0mm＜φ＜6.5mm

D、φ＜6.0mm

(4) protracted hydrophilicity: with flow is that 1L/ divides tap water that paint sheet is carried out water to dash experiment, and after 100 hours, the natural wind oven dry is measured the diameter of diffusion (φ) within the 5 μ L water droplets 1 minute, in order to estimate the size of contact angle (θ)

A、θ＜10°(φ＞5.5mm)

B、5.5mm＜φ＜6.0mm

C、5.0mm＜φ＜5.5mm

D、φ＜5.0mm

(5) sticking power: with wide stroke of lattice device of 1mm, mark 10 * 10 grids on coating, the 3M adhesive tape is torn experiment

A, 100/100, nothing comes off

B, intersection are pointed out and are come off

C, part grid come off

D, big area come off

Each organizes application example after testing, the gained result as shown in Table 3:

Table three:

Instance number	Performance
						Alkali resistance	Salt fog resistance	The initial stage wetting ability	Protracted hydrophilicity	Sticking power
	Application example 1	A	A	A	A						A
Application example 2						A	C	D	D	A
	Application example 3	D	A	A	B						A
Application example 4						A	B	C	A	D
	Application example 5	D	A	A	A						C
Application example 6						A	C	B	D	A
	Application example 7	C	A	D	A						A
Application example 8						A	D	C	A	A
	Application example 9	A	D	C	A						A
Application example 10						A	D	C	B	A

Illustrate: as the Application Example in this table three 1, be the application of being done with priming paint embodiment 1 and finish paint embodiment 1, Application Example 2 is application of being done with priming paint embodiment 2 and finish paint embodiment 2, and all the other by that analogy.

Therefore, the present invention adjusts prescription and forms by bottom surface bonded mode, can make the very superior hydrophilic paper tinsel coating prod of performance, is embodied in anticorrosion especially and the hydrophilicity aspect.

Claims (1)

1, water-borne coatings is characterized in that, it comprises primer base and finish paint coating, adopts two coatings, and primer base and finish paint coating are used in combination, and are coated with priming earlier on aluminium, and then overpainting, and wherein primer base comprises:

(A) but a kind of water dissipating resin composition comprise:

(a) the acrylic resin polymer emulsion of 20%～60% weight,

(b) the water soluble resin solidifying agent of 10%～20% weight,

(B) anticorrosive agent of 0.1～0.4% weight,

(C) aqueous color paste of 0.06～0.1% weight,

(D) the water-based defoamer of 0.2～1.0% weight,

(E) the water-based flow agent of 0.3～1.0% weight,

(F) cellosolve of 5～20% weight,

(G) the rest part water supplies 100%;

Finish paint coating comprises:

(A) a kind of aqueous resin composition comprises:

(a) water soluble acrylic resin's polymkeric substance of 20～60% weight,

(b) the PVP resinous polymer of 0～10% weight,

(c) the water soluble amino resin polymkeric substance of 0～15% weight,

(d) water-soluble nylon of 0～3% weight,

(e) PVA of 0～3% weight,

(B) silicon sol of 1～10% weight,

(C) tensio-active agent of 0.1～10% weight,

(D) cellosolve of 5～20% weight,

(E) the rest part water supplies 100%.