CN102277080B - Single-component poly urethane (PU) low-temperature cured hardware coating and preparation method - Google Patents
Single-component poly urethane (PU) low-temperature cured hardware coating and preparation method Download PDFInfo
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Abstract
The invention relates to a single-component poly urethane (PU) low-temperature cured hardware coating and a preparation method. Vernix is prepared from hydroxy acrylic resin serving as a main ingredient, part of hydroxyl polyester resin and amino resin and a mixed solvent, an acid catalyst, a defoamer and a flatting agent which serve as auxiliary materials. The preparation method comprises the following steps of: preparing, dispersing, and blending. The single-component PU low-temperature cured hardware coating has the characteristics of simple construction process, long service life, high metal texture of prepared metallic paint, energy conservation and low cost, and is mainly applied to hardware substrates.
Description
Technical field
The present invention relates to PU coating and amido coatings and preparation method thereof, is mainly the preparation method of a kind of low-temperature curing single-component PU five metals varnish and colored paint.
Background technology
Along with people's living standard improves constantly, outward appearance aesthetic conceptions to electronic product, the consumer's goods improve constantly, require electronic product energy and the plastic cement products of five metals ground also will have good external coating effect, view and admire requirement to satisfy people, common baking vanish is good to metal adhesion, but high temperature construction, energy consumption is large, cost is high, for save energy and environmental requirement, and coating and complete processing that the common pursuit energy consumption of people is low.
But at present, solidifying agent and adhesion promoter in the two component PU coating of low temperature can make silver powder return slightly, turn black, and physicochemical property is bad, and the solidifying agent cost is high, and construction is complicated, and two rear engineering times of components mixing are shorter, can not have good external coating effect.Can not meet the quality requirements of product far away.
Summary of the invention
Therefore, the objective of the invention is in order to overcome above-mentioned deficiency, a kind of single-component PU coating and preparation method for the low-temperature curable of spraying use on metal substrate is provided, easy construction, energy consumption is low, five metals coating and the preparation method of physicochemical property excellence.
Another object of the present invention is to provide a kind of low-temperature curing single-component PU five metals coating and preparation method, this five metals coating and preparation method not only have good external coating effect, and preparation is simple, with low cost, is convenient to be applied to the surface decoration of various electronic products.
Based on this, the technical scheme that the present invention solves its technical problem employing is.
A kind of single-component PU low-temperature curing five metals coating, it is characterized in that described five metals coating, it is made according to following weight proportion: Hydroxylated acrylic resin 30-40 part, hydroxy polyester resin 15-20 part, aminoresin 20-30 part, mixed solvent 10-20 part, acid catalyst 1-5 part, flow agent 0.5-2 part, defoamer 0-1 part.
The anti-alcohol of Hydroxylated acrylic resin, chemical resistance, good to metal adhesion, consistency is good, makes arranging of silver powder, but recoatability is good, and hydroxy polyester resin has high hydroxyl value, and chemical resistant properties is good, the wear-resisting test of anti-paper tape (RCA) height, consistency is good, and the aminoresin consistency is good, and anti-physics and chemistry is good, low-temperature reactivity is high, with the five metals coating that the three organically arranges in pairs or groups and can form low-temperature curing, this five metals coating is convenient to preparation and is used, and has the advantages that energy consumption is low, physicochemical property is excellent.
As preferably, described Hydroxylated acrylic resin is the epoxy modified hydroxyl acrylic resin, the combination of alkyd modified Hydroxylated acrylic resin any one or two kinds.
As preferably, described hydroxy polyester resin is fatty acid modified hydroxyl polyester, polyester polyol resin, the combination of silicone modified hydroxyl polyester resin any one or three kinds.
As preferably, described aminoresin is high methyl-isobutyl-etherificate terpolycyantoamino-formaldehyde resin, high imino-(NH) terpolycyantoamino-formaldehyde resin, the combination of any one of poly-hydroxy modified cyanurotriamide cross-linked resin or three kinds.
As preferably, described mixed solvent is: any one of n-butyl acetate, di-alcohol ethyl ether acetate ester, ring ethyl ketone, mibk, propyl carbinol or multiple combination.
As preferably, described acid catalyst is: amine sealing p-Xylol sulfonic acid, Witco 1298 Soft Acid, phosphoric acid derivatives, two nonyl naphthalene disulfonic acids any one or multiple combination.
As preferably, described flow agent is any one or two kinds of combinations of polyether-modified polydimethylsiloxane, fluorine-carbon modified polyacrylic ester; Defoamer is selected poly-fluorine modified polyorganosiloxane, Siloxane-Oxyalkylene Copolymers any one or two kinds of combinations.
For the concrete preparation method of above-mentioned five metals coating, the preparation method of the single-component PU low-temperature curing five metals coating that the present invention realizes comprises the steps:
(1) batching 1: in a container, add the acid catalyst of mixed solvent and homogenous quantities ratio, stir, fully filter after dissolving, obtain dilute solution;
(2) batching 2: according to aforementioned proportioning, add Hydroxylated acrylic resin in another container, hydroxy polyester resin carries out pre-dispersed with rising to the 1500rmp(slow start after the dispersion machine slow start), add again aminoresin to rise to 2000rmp normal temperature and disperseed 20-60 minute, obtain compound;
(3) disperse: the dilute solution of inciting somebody to action adds in compound by formula rate, then adds respectively remaining mixed solvent and flow agent, defoamer normal temperature to disperse 20-60 minute;
(4) modulation: scattered varnish is finished product varnish with strainer filtering, can adds according to demand mill base and prepare colored paint, also can add aluminium-silver slurry, pearlescence is made metal effect paint.
In step (2) and step (3), normal temperature disperses, and jitter time is controlled at 20-40 minute usually.
Described strainer filtering is to adopt 500 purpose filter screens to filter.
The present invention has following beneficial effect: 1, this varnish is single-component, easy construction; 2, cost is low, and low-temperature curing need not be added expensive solidifying agent; 3, sticking power is good, and the metal sense is strong; 4, than separately two component PU paints and the independent comprehensive good physical and chemical properties of baking vanish, the hybrid cross-linked density of system improves; 5, save client's energy, reduce the coating cost, satisfy high-end application ring and survey requirement.
Embodiment
The invention will be further described below in conjunction with embodiment, but should understand these embodiment limits the scope of the invention, in the spirit and scope of the present invention situation, those skilled in the art can make changes and improvements to the present invention, so that it adapts to working conditions and embodiment under different situations.
this single-component PU low-temperature curing five metals coating that the present invention realizes, it is with good to metal adhesion, the Hydroxylated acrylic resin that chemical resistance is good is main component, add hydroxyl polyester to improve hardness, anti-RCA, take aminoresin as solidifying agent, acid catalyst reduces solidification value, improve curing speed, with defoamer, flow agent is auxiliary material, with the mixed solvent adjusting viscosity, wherein the weight proportion of the each component of preparation is as follows: Hydroxylated acrylic resin 30-40 part, hydroxy polyester resin 15-20 part, aminoresin 20-30 part, mixed solvent 10-20 part, acid catalyst 1-5 part, flow agent 0.5-2 part, defoamer 0-1 part, its production technique mainly comprises: batching, disperse, the modulation three phases.
Wherein mixed solvent is selected: one or more mixing of n-butyl acetate, di-alcohol ethyl ether acetate ester, ring ethyl ketone, methyl iso-butyl ketone (MIBK), propyl carbinol.
Wherein acid catalyst is selected: amine sealing p-Xylol sulfonic acid, Witco 1298 Soft Acid, phosphoric acid derivatives, two one or more combinations of nonyl naphthalene disulfonic acid.
Wherein defoamer is selected poly-fluorine modified polyorganosiloxane, Siloxane-Oxyalkylene Copolymers is a kind of or two kinds of combinations.Flow agent is selected polyether-modified polydimethylsiloxane, fluorine-carbon modified polyacrylic ester is a kind of or two kinds of combinations
Embodiment one.
The preparation method of single-component PU low-temperature curing five metals coating of the present invention comprises that step is as follows.
Batching 1: in the stirred measuring cup of a constant volume, at first add 1 part of 1 part of mixed solvent and acid catalyst, stir with stirring rod and be sufficiently uniformly dissolved rear filtration, obtain dilute solution.
Batching 2: add 30 parts of Hydroxylated acrylic resins in another metal bucket, 15 parts of hydroxy polyester resins fix metal bucket with the dispersion machine of suitable size, rise to 1500rmp after slow start, add again 20 parts, aminoresin to rise to 2000rmp normal temperature and disperseed 20 minutes, obtain compound.
Disperse: the dilute solution that will prepare burden in 1 adds in the compound of batching 2 by formula rate, then adds respectively 0.25 part of 9 parts of mixed solvents and flow agent, and normal temperature dispersion 20 minutes obtains varnish.
Modulation: scattered varnish is filtered with 500 mesh filter screens be finished product varnish, finished product varnish can add mill base according to customer requirement and make colored paint, also can add aluminium-silver slurry, pearlescence to make metal effect paint, be determined by concrete application conditions with the proportioning of mill base, aluminium-silver slurry, pearlescence.
Application examples one.
With solvent-borne type low-temperature curing single-component PU five metals varnish 70 parts of (weight ratio) and PU coating 30 parts of black slurry (weight ratio) that aforesaid method makes, mix the 2000rmp high speed dispersion and obtain black paint after 30 minutes, inferior black paint can be used for the metal aluminum sheet spraying.
Embodiment two.
The preparation method of single-component PU low-temperature curing five metals coating of the present invention comprises that step is as follows.
Batching 1: in the stirred measuring cup of a constant volume, at first add 5 parts of 5 parts of mixed solvents and acid catalysts, stir with stirring rod and be sufficiently uniformly dissolved rear filtration, obtain dilute solution.
Batching 2: add 40 parts of Hydroxylated acrylic resins in another metal bucket, 25 parts of hydroxy polyester resins fix metal bucket with the dispersion machine of suitable size, rise to 1500rmp after slow start, add again 30 parts, aminoresin to rise to 2000rmp normal temperature and disperseed 60 minutes, obtain compound.
Disperse: the dilute solution that will prepare burden in 1 adds in the compound of batching 2 by formula rate, then adds respectively 15 parts of mixed solvents and 2 parts of flow agents, 1 part of normal temperature dispersion of defoamer 60 minutes, obtains varnish.
Modulation: scattered varnish is filtered with 500 mesh filter screens be finished product varnish, finished product varnish can add mill base according to customer requirement and make colored paint, also can add aluminium-silver slurry, pearlescence to make metal effect paint, be determined by concrete application conditions with the proportioning of mill base, aluminium-silver slurry, pearlescence.
Use two.
86 parts, the finished product varnish that embodiment two is obtained, the uniform mixture fusion that 10 parts, aluminium silver powder and n-butyl acetate are 10 parts disperse to obtain silver paint after 30 minutes with low speed 1000rmp, and this silver paint can be used for metal aluminum sheet and sprays.
Above-mentioned formula solidify to place oven temperature 80-90 ℃ of baking the performance index that reach after 24h fully after 30 minutes as follows.
Sticking power test: 100/100.
Anti-ethanol test: (99.5% ethanol) is more than 500g/400 time.
Hardness test: (Mitsubishi's pencil) 1KG/2H passes through.
Anti-RCA:175g power/more than 400 circles.
High-temp resisting high-humidity resisting: (face shield UV 60 ℃ * 95% 96H) passes through.
Face shield UV salt water resistance spraying: (5%Nacl * 96H) pass through.
Face shield UV acid and alkali-resistance: (PH4.7 * 48H PH10.8 * 48H) pass through.
Face shield UV, water boiling resistance: (100 ℃ * 1.5h) pass through.
Embodiment three.
The preparation method of single-component PU low-temperature curing five metals coating of the present invention comprises that step is as follows.
Batching 1: in the stirred measuring cup of a constant volume, at first add 3 parts of 3 parts of mixed solvents and acid catalysts, stir with stirring rod and be sufficiently uniformly dissolved rear filtration, obtain dilute solution.
Batching 2: add 35 parts of Hydroxylated acrylic resins in another metal bucket, 20 parts of hydroxy polyester resins fix metal bucket with the dispersion machine of suitable size, rise to 1500rmp after slow start, add again 25 parts, aminoresin to rise to 2000rmp normal temperature and disperseed 40 minutes, obtain compound.
Disperse: the dilute solution that will prepare burden in 1 adds in the compound of batching 2 by formula rate, then adds respectively 12 parts of mixed solvents and 1 part of flow agent, 0.5 part of normal temperature dispersion of defoamer 40 minutes, obtains varnish.
Modulation: scattered varnish is filtered with 500 mesh filter screens be finished product varnish, finished product varnish can add mill base according to customer requirement and make colored paint, also can add aluminium-silver slurry, pearlescence to make metal effect paint, be determined by concrete application conditions with the proportioning of mill base, aluminium-silver slurry, pearlescence.
All raw material all can be buied by locating on market in an embodiment.
In sum, solvent-borne type low-temperature curing single-component PU five metals coating varnish low-temperature curing of the present invention is quick, becomes film hardness high, and anti-physicochemical property is excellent, has good appearance property, can satisfy the high-end product ring such as electronic product, the consumer's goods and survey requirement.
In addition to the implementation, the present invention can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (7)
1. single-component PU low-temperature curing five metals coating, it is characterized in that described five metals coating, it is made according to following weight proportion: Hydroxylated acrylic resin 30-40 part, hydroxy polyester resin 15-20 part, aminoresin 20-30 part, mixed solvent 10-20 part, acid catalyst 1-5 part, flow agent 0.5-2 part, defoamer 0-1 part; Described Hydroxylated acrylic resin is the epoxy modified hydroxyl acrylic resin, the combination of alkyd modified Hydroxylated acrylic resin any one or two kinds; Described hydroxy polyester resin is fatty acid modified hydroxyl polyester, polyester polyol resin, the combination of silicone modified hydroxyl polyester resin any one or three kinds.
2. single-component PU low-temperature curing five metals coating according to claim 1, it is characterized in that described aminoresin is high methyl-isobutyl-etherificate terpolycyantoamino-formaldehyde resin, high imino-terpolycyantoamino-formaldehyde resin, the combination of any one of poly-hydroxy modified cyanurotriamide cross-linked resin or three kinds.
3. single-component PU low-temperature curing five metals coating according to claim 1 is characterized in that described acid catalyst is: amine sealing p-Xylol sulfonic acid, Witco 1298 Soft Acid, phosphoric acid derivatives, two nonyl naphthalene disulfonic acids any one or multiple combination.
4. single-component PU low-temperature curing five metals coating according to claim 1 is characterized in that described flow agent selects polyether-modified polydimethylsiloxane, fluorine-carbon modified polyacrylic ester any one or two kinds of combinations; Defoamer is selected poly-fluorine modified polyorganosiloxane, Siloxane-Oxyalkylene Copolymers any one or two kinds of combinations.
5. the preparation method of a single-component PU low-temperature curing five metals coating according to claim 1, is characterized in that, it is as follows that the method comprising the steps of:
(1) batching 1: in a container, add the acid catalyst of mixed solvent and homogenous quantities ratio, stir, fully filter after dissolving, obtain dilute solution;
(2) batching 2: according to aforementioned proportioning, add Hydroxylated acrylic resin in another container, hydroxy polyester resin rises to 1500rmp with dispersion machine after 500rpm disperses 10 minutes, add again aminoresin to rise to 2000rmp normal temperature and disperseed 20-60 minute, obtain compound;
(3) disperse: dilute solution is added in compound by formula rate, then add respectively remaining mixed solvent and flow agent, defoamer normal temperature to disperse 20-60 minute;
(4) modulation: scattered varnish is finished product varnish with strainer filtering, can adds according to demand mill base and prepare colored paint, also can add aluminium-silver slurry, pearlescence is made metal effect paint.
6. the preparation method of single-component PU low-temperature curing five metals coating according to claim 5, is characterized in that in step (2) and step (3), and the jitter time that normal temperature disperses is controlled at 20-40 minute.
7. the preparation method of single-component PU low-temperature curing five metals coating according to claim 5, is characterized in that described strainer filtering, is to adopt 500 purpose filter screens to filter.
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| CN 201110248764 CN102277080B (en) | 2011-08-27 | 2011-08-27 | Single-component poly urethane (PU) low-temperature cured hardware coating and preparation method |
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| CN 201110248764 CN102277080B (en) | 2011-08-27 | 2011-08-27 | Single-component poly urethane (PU) low-temperature cured hardware coating and preparation method |
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