CN102898937A - High-hardness scratch-resistant double-component waterborne polyurethane woodwork varnish and preparation method thereof - Google Patents
High-hardness scratch-resistant double-component waterborne polyurethane woodwork varnish and preparation method thereof Download PDFInfo
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Abstract
The invention discloses high-hardness scratch-resistant double-component waterborne polyurethane woodwork varnish and a preparation method thereof. The varnish consists of double components, i.e., a primer and a curing agent, wherein the primer consists of hydroxyl polyacrylate dispersion resin, dispersant, nano-scale silicon dioxide glass powder, a scratch-resistant wax auxiliary agent, an organic bismuth/zinc composite catalyst, an antifoaming agent, a wetting agent, water and an additive, wherein the sum of the weight percentages of the A components is 100 percent; the curing agent consists of propylene glycol ethyl ether acetate and allophanate modified HDI (Hexamethylene Diisocyanate) tripolymer; the sum of the weight percentages of the B components is 100 percent; and the A components and the B components are mixed according to the equivalent molar ratio of n-NCO:n-OH as 1.38:1.62. The varnish has the advantages of high hardness, shortened surface drying time and hard drying time, long activation period, superior performance, environmental friendliness of the product and high operability.
Description
[technical field]
The present invention relates to a kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer and preparation method thereof.
[background technology]
Woodwork coating is divided into oiliness woodwork coating and water-borne wood coating because of the difference of its dispersion medium.The oiliness woodwork coating is commonly called as woodenware paint, it is take various organic solvents such as benzene class, ketone, ester class, ethers etc. as dispersion medium, these solvents volatilize easily, irritating smell is arranged and to the murder by poisoning of human body various degrees, in production process, application process and drying process, constantly evaporate in the air or be absorbed by the body, seriously welding injures HUMAN HEALTH.Water-borne wood coating has thoroughly been eliminated the harm of organic solvent to human body take water as dispersion medium, has the incomparable advantage of traditional oil paint, such as health environment-friendly, low-carbon energy-saving, utilization ratio are high, security is good etc.
Entered since 21 century, along with the continuous enhancing of people's awareness of environment protection and health, the environmental regulation of various countries is tending towards harsh gradually to the restriction of VOC, and the solvent-borne type woodwork coating is subject to unprecedented challenge.Take the research of the new coating that alleviates low VOC that earth load carries out as purpose or zero VOC discharging, just increasingly become the focus of research and development.Water-borne coatings is the main force of following coating, accounts at present more than 30% of world's coating total amount; In China, the average growth rate per annum of water-borne wood coating over nearly 5 years surpasses 15%, and water-borne wood coating substitutes the trend that traditional solvent based coating has become future development.
Although traditional mono-component aqueous woodwork coating has health environment-friendly, the advantage such as easy to operate, the shortcoming such as ubiquity gloss is not high, hardness is lower, scratch resistance is bad, wearability is poor, chemical resistant properties is unstable.The two-pack woodwork coating forms fine and close paint film by the external crosslinking of isocyanic acid ester bond and hydroxyl or other groups, therefore has the advantages such as relatively high hardness and wear resistance, more outstanding thermotolerance, better anti-pollution and chemical resistance.But the bi-component waterborne woodwork coating of selling in the market still exist storage period short, time of drying is long, constructional difficulties and hardness and wear resistance can not show a candle to the disadvantages such as solvent based coating, therefore, the high-performance water-based two-pack woodwork coating that meets the requirements of the customers of exploitation is imperative.
[summary of the invention]
Purpose of the present invention provides a kind of storage period long exactly for overcoming the deficiencies in the prior art, during use time of drying long, construction easily, hardness and wear resistance are good, the high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer of health environment-friendly.
Another object of the present invention provides a kind of preparation method of this double-component waterborne polyurethane woodenware lacquer.
The present invention for achieving the above object, by the following technical solutions:
A kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer is characterized in that composed of the following components by weight percentage:
A component: main lacquer
Wherein the weight percent sum of A component is absolutely,
B component: solidifying agent
Propylene-glycol ethyl ether acetic ester 12%～16%
Allophanate-modified HDI tripolymer 84%～88%,
Wherein the weight percent sum of B component is absolutely,
A component and B component are according to n
-NCO: n
-OH=1.38～1.62 equivalent mol ratio is mixed.
Aforesaid a kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer is characterized in that described scratch resistance wax assistant is the polytetrafluoroethylmodified modified polyethylene wax of micronization.
Aforesaid a kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer is characterized in that described glass powder is nanometer grade silica glass powder.
Aforesaid a kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer is characterized in that described additive is the mixture more than 4 kinds in sanitas, thickening material, film coalescence aid, mould inhibitor, antiblocking agent or the flow agent.
Aforesaid a kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer is characterized in that described sanitas is the isothiazolinone biocide agent, and its content is 0.1～0.3%; Described thickening material is non-ionic associative type polyurethane thickening material, and its content is 0.3～0.9%; Described film coalescence aid is dipropylene glycol methyl ether, and its content is 2～5%; Described mould inhibitor is dichloro octyl group isothiazolinone, and its content is 0.1～0.3%; Described antiblocking agent is the high molecular aqueous emulsion of dimethyl polysiloxane fluid, and its content is 0.1～0.3%; Described flow agent is polyether siloxane copolymer, and its content is 0.05～0.1%; Wherein said content is the weight percentage with respect to the varnish gross weight.
The preparation method of aforesaid a kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer is characterized in that comprising following processing step:
A, preparation A component master lacquer: the water and the hydroxyl polyacrylate dispersion resin that at first in disperseing cylinder, add entry gross weight 10%～20%, and carry out middling speed and disperse, evenly sneak into again dispersion agent, glass powder, after the high speed dispersion 15～30 minutes, add scratch resistance wax assistant, organo-bismuth/zinc composite catalyst, defoamer, wetting agent and other components, middling speed was disperseed after 15～25 minutes, sampling detects finish fineness and viscosity, filter tinning, packing;
B, preparation B component solidifying agent: in disperseing cylinder, add successively propylene-glycol ethyl ether acetic ester, allophanate-modified HDI tripolymer, mix and get final product;
C, preparation dual-component aqueous polyurethane woodenware lacquer: with A component and B component according to n
-NCO: n
- OH=1.38～1.62 equivalence ratio mixes, and leaves standstill 15min and gets final product.
The preparation method of aforesaid a kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer is characterized in that the speed that described middling speed is disperseed is 600～800r/min; The speed of described high speed dispersion is 1000～l500r/min.
The preparation method of aforesaid a kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer is characterized in that described A component finish fineness is 20～35um, and described finished product viscosity is 80～110s.
Hydroxyl polyacrylate dispersion resin described in the present invention is the Bayhydrol XP 2470 of German Bayer company; Described organo-bismuth/zinc composite catalyst is the organo-bismuth/zinc composite catalyst of the leading chemical company of the U.S.; Described allophanate-modified HDI tripolymer is the Bayhydur VP LS 2336 of German Bayer company.
The present invention considered the selection of the selection of hydroxyl water-based polyol component, the selection that contains the Hydrophilic polyisocyanates solidifying agent of isocyano, catalyzer and consumption ,-special auxiliary agent such as proportioning, nano silicon glass powder and modified polyethylene wax of NCO and-OH a plurality of factors such as select.
1. preferably water decentralized acrylic polyol dispersion is the hydroxy component of waterborne two-component polyurethane coating, fundamentally guarantee the higher degree of crosslinking that hydroxy component is filmed to good dispersiveness and the two component polyurethane of polyisocyanate curing agent, obtain excellent performance, low-cost waterborne two-component polyurethane coating product.
The bi-component waterborne woodwork coating has aquosity short oil alkyd resin, waterborne polyester, water-borne acrylic resin and aqueous polyurethane with the resin hydroxy component, its reaction mechanism and solvent-type double-component wood lacquer are roughly the same, namely in the resin Composition-in OH and the curing agent component-the NCO reaction generates ammonia ester bond.The bi-component waterborne woodwork coating can be divided into emulsion-type polyvalent alcohol and aqueous dispersion type polyvalent alcohol with resin by the polymer latex body structure.The emulsion-type polyvalent alcohol is the acrylic polyol latex with various structures that obtains by letex polymerization, and its advantage is that the relative molecular mass of polymkeric substance is large, and filming, at room temperature rate of drying is fast; Shortcoming is that it is relatively poor to unmodified polyisocyanate curing agent dispersiveness, causes paint film appearance poor, and working life is short.Contain hydrophilic ionogen or hydrophilic nonionic segment in the molecular structure of aqueous dispersion type polyvalent alcohol, relative molecular mass is low, and dispersion particle diameters is little, and (10～20nm), to the solidifying agent excellent dispersion, the appearance of film of formation is good.The aqueous dispersion type polyvalent alcohol can be divided into again polyurethane polyol dispersion, polyester polyol dispersion, acrylic polyol dispersion.Polyurethane polyol dispersion film-forming temperature is low, can not add or only add a small amount of film coalescence aid and get final product film forming, and manual stirring property is relatively good during construction, be not easy to cause bubble, its appearance of film is good, has excellent mechanical property, chemical resistant properties and wear resistance, but price is more expensive, and rate of drying is slow.The two-component coating of polyester polyol formulated has good fluidity,, coating film gloss advantages of higher strong to pigment wettability, but the ester bond of polyester polyol is hydrolyzed easily, makes the polymer bonds fracture, and the hydrolytic resistance that causes filming is poor.Water-dispersed acrylic polyol dispersions film-forming temperature is higher, needs more film coalescence aid, and manual stirring property is slightly poor during construction, easily produces bubble; But the water-based hydroxyl acrylic acid dispersion has lower relative molecular mass (Mn=2000～10000), higher hydroxy functionality, less particle diameter, to the solidifying agent good dispersity, the degree of crosslinking of filming height, paint film excellent combination property, and low price, moderate drying speed.From the present Research of domestic and international waterborne two-component polyurethane coating, the water-based hydroxyl acrylic acid dispersion has larger range of choice on price and performance characteristic, is the higher class hydroxy component of current water-borne wood coating market acceptance.
The present invention selects the Bayhydrol XP 2470 of Bayer Material Science company to be hydroxy component.Bayhydrol XP 2470 is hydroxyl polyacrylate dispersion resins of a kind of excellent performance, can adjust its viscosity by thin up, to satisfy the requirement of coating application.This hydroxy component uses with the paint of aliphatic isocyanates solidifying agent, can obtain the aqueous two-component polyurethane paint film of Gao Zedu; Its hardness of paint film height, good toughness, water tolerance and solvent resistance are outstanding.
2. take allophanate-modified HDI tripolymer as solidifying agent, fundamentally improve even Combination and the highly compatible of polyisocyanate curing agent and hydroxy component, significantly promote the transparency and glossiness that dual-component aqueous polyurethane is filmed.
For the waterborne two-component polyurethane coating system, selecting suitable polyisocyanate curing agent is the important factor that determines film performance.The solidifying agent that is used for waterborne two-component polyurethane coating can be divided into two classes: the polyisocyanates of unmodified polyisocyanates and modification.Unmodified polyisocyanates is difficult to evenly mix with hydroxy component, the phenomenon that under the condition of stirring at low speed, very easily is separated, thereby greatly limited its application in the dual-component aqueous polyurethane system.As using it for bicomponent system, must use viscosity and the low polyisocyanates of reactive behavior as far as possible, or use solvent cut, to reduce its viscosity.
Want to make polyisocyanate component and hydroxy component evenly to mix, the most basic approach is exactly the polyisocyanates Water-borne modification.Usually there are two kinds of methods to realize this goal, that is: outer emulsion process and internal emulsification method.The former uses ionic or nonionic emulsifier, be wrapped in the polyisocyanates surface by physics mode and realize that it disperses in water, but exist the shortcomings such as emulsifier is large, the rear particle of dispersion is thick, working life is short, water tolerance is not good, thereby use less.In order to overcome the defective with upper outside emulsion process, adopt in recent years hydrophilic component that polyisocyanates is carried out chemical modification, is that the research of internal emulsification is more, these hydrophilic components and polyisocyanates have good consistency, help solidifying agent in the dispersion of aqueous phase as internal emulsifying agent.
The present invention selects the Bayhydur VP LS 2336 of Bayer Material Science company to be solidifying agent.Bayhydur VP LS 2336 is allophanate-modified HDI tripolymers of a kind of easy dispersion, the speed of reaction of this HDI type trimer curing agent and water is slower, but not yellowing, gloss retention is good, viscosity is low, good stability, and long methene chain makes paint film have preferably scratch resistance; Moreover this allophanate-modified HDI tripolymer product is good with a lot of water-base resin consistencies, and the transparency of therefore filming is good, and glossiness is high, and to delustring also without considerable influence, be suitable for high light and inferior light system.
3. optimize the NCO/OH equivalence ratio, realize the effective control to the waterborne two-component polyurethane coating formulation cost, obtain the optimum balance that paint film is done speed, hardness and chemical-resistant.
In dual-component aqueous polyurethane woodwork coating system, general-NCO is 1 with the theoretical value of the ratio of-OH, but in actual applications, its ratio must be greater than 1.This is because in the coating drying process ,-NCO except with water-base resin in-OH reaction, also produce CO with the water reaction
2Gas, this be contain-the NCO aqueous wood lacquer with double components produces a major reason of bubble in construction process; Simultaneously ,-NCO also can with other functional group reactions, such as-NCO and amine reaction, generate urea.-NCO is very sensitive to water with the reaction of-OH, therefore, in dual-component aqueous polyurethane woodwork coating system, although waterborne curing agent all passed through respective handling, made it-and NCO is partly as far as possible few to be contacted with water, with guarantee its as far as possible with resin in-the OH reaction, but the reaction of it and water is still inevitably.The speed of response of polyisocyanates and polyvalent alcohol hydroxyl is fast with the speed of response of water, but isocyanic ester always is consumed a part, generates amine and carbonic acid gas with the water reaction, and amine generates urea with isocyanate reaction again; In addition ,-NCO is polystep reaction with the reaction of-OH, and more to the reaction later stage, speed of reaction is slower, the rising along with reaction later stage viscosity, have-OH is difficult to contact and cause with-NCO-and OH is residual.-OH's is residual, will cause disadvantageous effect to the performance of filming, as make the water tolerance variation.In order to realize as far as possible the abundant reaction of hydroxyl, when the proportioning of design-NCO and-OH, the permission-NCO that has to is excessive.Along with the NCO/OH ratio increases, namely along with curing agent content increases, hardness of film increases, sticking power improves; And the solidifying agent of lower aq is conducive to the improvement of shortening, the prolongation of working life and the appearance of film of surface drying time.Consider NCO/OH proportioning size to the impact of each side, in the waterborne two-component polyurethane coating product system that the present invention relates to, optimizing NCO/OH equivalent mol ratio is 1.38～1.62, both effectively control the formulation cost of waterborne two-component polyurethane coating, obtained again the optimum balance of the dried speed of paint film, hardness and chemical-resistant.
4. the composite catalyst of the friendly type organo-bismuth of environment for use and organic zinc creatively, obtain the overall equilbrium of construction time limit, surface drying speed and film performance, both accelerated significantly the speed of response of isocyanic ester and hydroxyl, effectively suppressed the reaction of water and isocyanic ester, significantly reduced again bubble formation, promoted the formation of aqueous polyurethane coating high-quality paint film.
Waterborne two-component polyurethane coating is comprised of the water-based polyol component of hydroxyl and the Hydrophilic polyisocyanates solidifying agent that contains isocyano, by-NCO and-OH at normal temperatures crosslinking curing form and have filming of dimensional network structure.Because the high reaction activity of-NCO, polyisocyanates when reaction generates carbamate with hydroxy component, also are easy to the water reaction that contains reactive hydrogen and emit carbonic acid gas.This side reaction causes coating to produce many defectives, and is high such as pot-life weak point, foaming, cost, and degradation under the cross-linking density of filming, gloss, thickness.Select suitable catalyzer and consumption thereof to be a reaction that promotes isocyanic ester and hydroxy component, to reduce the side reaction between polyisocyanates and the water, the important channel of raising film performance.
Catalyzer commonly used in the polyurethane coating generally has tertiary amines and organometallics two classes.Tertiary amine catalyst is effective especially to the reaction that promotes isocyanate group and water, generally for the preparation of urethane foam.Organometallics is right-catalytic reaction specific activity-NCO of NCO and-OH and water by force, be widely used in the polyurethane system; Wherein, using comparatively general organometallics is organo-tin compound.Yet along with the day by day increase of environmental protection requirement, the use of organo-tin compound has been subject to the restriction of environmental protection day by day.
The present invention is the composite catalyst of the friendly type organo-bismuth of environment for use and organic zinc creatively, uses it for the waterborne two-component polyurethane coating system.Organo-bismuth/zinc composite catalyst is right-NCO follows the second order reaction dynamic law with the reaction of-OH, the adding of this catalyzer can-NCO and-apparent activation energy that OH reacts is by 52152kJmol
-1Be down to 47132kJmol
-1, make-NCO accelerates with the speed of response of-OH, suppressed to a certain extent-reaction of NCO and water.The consumption of this catalyzer has obvious impact to the aqueous polyurethane coating with bi component system, when additive capacity is 0.15%～0.45%, can obtain to grow the overall equilbrium of the aspects such as construction time limit, very fast surface drying speed and excellent film performance.
5. introduce the polytetrafluoroethylmodified modified special auxiliary agent such as polyethylene wax of nanometer grade silica glass powder and micronization, optimize formulation for coating material, significantly improve hardness of paint film and the surperficial scratch resistance effect of dual-component aqueous polyurethane woodwork coating.
The dual-component aqueous polyurethane woodwork coating has the advantages such as VOC content is low, paint film is fresh and clean, the operation construction is simple, and the external crosslinking by isocyanate key and oh group forms the paint film more finer and close than mono-component aqueous woodwork coating, the thermotolerance of paint film, anti-pollution and chemical-resistant have also had larger improvement than mono-component aqueous woodwork coating, but the bi-component waterborne woodwork coating of selling in the market still ubiquity hardness, damage resistant and wear resistance can not show a candle to the problem of solvent based coating.Product of the present invention preferably water decentralized acrylic polyol dispersion be hydroxy component, preferred allophanate-modified HDI tripolymer be solidifying agent, optimize the NCO/OH equivalence ratio, creatively on the basis of the composite catalyst of the friendly type organo-bismuth of environment for use and organic zinc, in dual-component aqueous polyurethane woodwork coating prescription, introduce the polytetrafluoroethylmodified modified polyethylene wax of micronization, with feel and the adhesion strength that improves paint film; Introduce nanometer grade silica glass powder, utilize the nano material technology of silica glass powder, surging hardness and the wear resisting property that improves paint film.By the introduction of specific function auxiliary agent and the formulation optimization of consumption thereof, significantly improve hardness of paint film and the adhesion strength of water-borne wood coating, the paint film effect that acquisition can follow the solvent-borne type woodwork coating to match in excellence or beauty.
In the waterborne two-component polyurethane coating product system that the present invention relates to, when the addition (massfraction) of the polytetrafluoroethylmodified modified polyethylene wax of micronization was 1.2%～3.6%, the feel of paint film and adhesion strength improved maximum; When the addition (massfraction) of nanometer grade silica glass powder was 3.8%～6.5%, the glossiness of filming was little with the adding impact of nano-glass powder, but hardness of film can significantly rise to 2H.
Product of the present invention is compared with prior art products, and following advantage is arranged:
(1) product of the present invention has been got important breakthrough aspect key performance indicator value hardness and scratch resistant performance.Hardness of paint film will be higher than the B that " the indoor water-borne wood coating industry standard of HG/T 3828-2006 " requires far away, reaches 2H, can be in the hardness of paint film of solvent borne woodwork coating same class fully.The scratch resistant performance of paint film also is significantly improved, and reaches the damage resistant effect that can follow the solvent-borne type woodwork coating to match in excellence or beauty; According to GB/T 9729 standard codes, scratch test for constant load 100g at scriber, detected result reaches the rank of " not scratching ".
(2) product of the present invention is by hydroxy component and the isocyanate component of screening waterborne two-component polyurethane coating, and the advanced formulation for coating material technology of utilization, (pressing the GB/T9754 regulation measures so that the product gloss of film can reach 75 °, 60 °) more than, the problem of " the common low luster coating product, rare semigloss coating product, almost lose high-gloss paint product " that has solved that water-borne wood coating market for a long time occurs because coating film gloss is on the low side.
(3) product surface drying of the present invention obviously shortened with the time of doing solid work, and the pot-life behind the Product mix has obtained prolongation by a relatively large margin.According to " the indoor water-borne wood coating industry standard of HG/T 3828-2006 " requirement, the surface drying time of waterborne two-component polyurethane coating product is respectively 60min and 24h with the time of doing solid work.The rate of drying of product of the present invention is significantly improved, and its surface drying time shortens to respectively 45min and 6h with the time of doing solid work.On the other hand, the pot-life of product of the present invention has but had largely prolongation.The waterborne two-component polyurethane coating product of selling on the Vehicles Collected from Market, its pot-life is usually about 2h, short pot-life forces coating products after carrying out the mixing of A component (main lacquer) and B component (solidifying agent), must finish using as early as possible, otherwise will have a strong impact on the performance of product even can not use.The pot-life of product of the present invention has prolonged one times than the pot-life of the waterborne two-component polyurethane coating product of selling on the market, for the use behind this patent Product mix provides more broad time range more than 4h.
(4) product of the present invention is dual-component aqueous polyurethane woodwork coating product, external crosslinking by isocyanate key and oh group forms the paint film more finer and close than mono-component aqueous woodwork coating, General Promotion the water tolerance of paint film, stain resistance and chemical-resistant, full item passed through the test of paint film water tolerance, stain resistance and chemical-resistant that " the indoor water-borne wood coating industry standard of HG/T 3828-2006 " require, given the advantage that this product paint film has more useful life longevity.
(5) product of the present invention adopts waterborne two-component polyurethane coating paint technology, has reduced in the Lacquered Tin Plate Can and the consumption of the pungency volatile matter of construction process, has reduced significantly the content of product VOC.The TVOC of this water-borne wood coating product can be controlled in below the 165g/L, well below the Limited Doses 250g/L of the strictest environmental protection standard of coating industry (HJ/T201-2005) requirement, thus the surging environmental-protecting performance that highlights the dual-component aqueous polyurethane woodwork coating.
(6) product of the present invention is take the water-dispersed acrylic polyol dispersions as hydroxy component, take the allophanate-modified HDI tripolymer of easy dispersion as polyisocyanate component, and these two kinds of component compatibilities are good, mix easily.When the mixing of carrying out the two-pack product is used, need not pass through high speed dispersion, only need simple stirring can realize that hydroxy component mixes with the even of multicyanate esters component, thereby easy construction, workable.
(7) product performance index of the present invention reaches water-borne wood coating industry standard " the indoor water-borne wood coating of HG/T3828-2006 " to comprehensive requirement of bi-component waterborne woodwork coating.
(8) product of the present invention meets comprehensive requirement of national environmental standard HJ/T20l-2005 " environmental labelling product technical requirements: water-borne coatings ".
[embodiment]
Describe the present invention below in conjunction with embodiment:
A kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer, composed of the following components by weight percentage:
A component: main lacquer
Wherein the weight percent sum of A component is absolutely,
B component: solidifying agent
Propylene-glycol ethyl ether acetic ester (PMA) 12%～16%
Allophanate-modified HDI tripolymer 84%～88%,
Wherein the weight percent sum of B component is absolutely,
A component and B component are according to n
-NCO: n
-OH=1.38～1.62 equivalent mol ratio is mixed, namely in the A component-in NCO functional group and the B component-the equivalent mol ratio of OH functional group is 1.38～1.62.
Wherein additive is the mixture more than 4 kinds in sanitas, thickening material, film coalescence aid, mould inhibitor, antiblocking agent or the flow agent, and described sanitas is the isothiazolinone biocide agent, and its content is 0.1～0.3%; Described thickening material is non-ionic associative type polyurethane thickening material, and its content is 0.3～0.9%; Described film coalescence aid is dipropylene glycol methyl ether, and its content is 2～5%; Described mould inhibitor is dichloro octyl group isothiazolinone, and its content is 0.1～0.3%; Described antiblocking agent is the high molecular aqueous emulsion of dimethyl polysiloxane fluid, and its content is 0.1～0.3%; Described flow agent is polyether siloxane copolymer, and its content is 0.05～0.1%; Wherein said content is the weight percentage with respect to the varnish gross weight.
Prepare the method for above-mentioned aqueous polyurethane woodenware lacquer, may further comprise the steps:
A, preparation A component master lacquer: the water and the hydroxyl polyacrylate dispersion resin that at first in disperseing cylinder, add entry gross weight 10%～20%, and the middling speed of carrying out 600～800r/min is disperseed, evenly sneak into again dispersion agent, glass powder, with the high speed dispersion of 1000～l500r/min after 15～30 minutes, add scratch resistance wax assistant, organo-bismuth/zinc composite catalyst, defoamer, wetting agent and other components, middling speed was disperseed after 15～25 minutes, sampling detects finish fineness in 20～35um scope, viscosity is in 80～110s scope, filter, tinning, packing;
B, preparation B component solidifying agent: in disperseing cylinder, add successively propylene-glycol ethyl ether acetic ester, allophanate-modified HDI tripolymer, mix and get final product;
C, preparation dual-component aqueous polyurethane woodenware lacquer: with A component and B component according to n
-NCO: n
- OH=1.38～1.62 equivalent mol ratio mixes, and leaves standstill 15min and gets final product.
The below enumerates specific embodiment, sees Table 1:
Table 1:
Embodiment 1:
Wherein additive comprises components by weight percent content: film coalescence aid 5%, thickening material 0.9%, sanitas 0.3%, mould inhibitor 0.3%, antiblocking agent 0.3%, flow agent 0.1%.
The preparation method of embodiment 1 is:
A, preparation A component master lacquer: the water and the hydroxyl polyacrylate dispersion resin that at first in disperseing cylinder, add entry gross weight 10%, and the middling speed of carrying out 800r/min is disperseed, evenly sneak into again dispersion agent, glass powder, after 15 minutes, add scratch resistance wax assistant, organo-bismuth/zinc composite catalyst, defoamer, wetting agent and other components with the high speed dispersion of 1500r/min, middling speed was disperseed after 15 minutes, sampling detects finish fineness and viscosity, filter tinning, packing;
B, preparation B component solidifying agent: in disperseing cylinder, add successively propylene-glycol ethyl ether acetic ester, allophanate-modified HDI tripolymer, mix and get final product;
C, preparation dual-component aqueous polyurethane woodenware lacquer: with A component and B component according to n
-NCO: n
- OH=1.38 NCO/OH equivalence ratio mixes, and leaves standstill 15min and gets final product.
Embodiment 2:
Wherein additive comprises components by weight percent content: film coalescence aid 4%, thickening material 0.7%, sanitas 0.1%, mould inhibitor 0.1%, antiblocking agent 0.2%, flow agent 0.05%.
The preparation method of embodiment 2 is:
A, preparation A component master lacquer: the water and the hydroxyl polyacrylate dispersion resin that at first in disperseing cylinder, add entry gross weight 15%, and the middling speed of carrying out 700r/min is disperseed, evenly sneak into again dispersion agent, glass powder, after 20 minutes, add scratch resistance wax assistant, organo-bismuth/zinc composite catalyst, defoamer, wetting agent and other components with the high speed dispersion of l300r/min, middling speed was disperseed after 20 minutes, sampling detects finish fineness and viscosity, filter tinning, packing;
B, preparation B component solidifying agent: in disperseing cylinder, add successively propylene-glycol ethyl ether acetic ester, allophanate-modified HDI tripolymer, mix and get final product;
C, preparation dual-component aqueous polyurethane woodenware lacquer: with A component and B component according to n
-NCO: n
-OH=1.42 NCO/OH equivalence ratio mixes, and leaves standstill 15min and gets final product.
Embodiment 3:
Wherein additive comprises components by weight percent content: film coalescence aid 2.7%, thickening material 0.5%, sanitas 0.15%, mould inhibitor 0.15%, antiblocking agent 0.15%.
The preparation method of embodiment 3 is:
A, preparation A component master lacquer: the water and the hydroxyl polyacrylate dispersion resin that at first in disperseing cylinder, add entry gross weight 20%, and the middling speed of carrying out 600r/min is disperseed, evenly sneak into again dispersion agent, glass powder, after 25 minutes, add scratch resistance wax assistant, organo-bismuth/zinc composite catalyst, defoamer, wetting agent and other components with the high speed dispersion of l000r/min, middling speed was disperseed after 25 minutes, sampling detects finish fineness and viscosity, filter tinning, packing;
B, preparation B component solidifying agent: in disperseing cylinder, add successively propylene-glycol ethyl ether acetic ester, allophanate-modified HDI tripolymer, mix and get final product;
C, preparation dual-component aqueous polyurethane woodenware lacquer: with A component and B component according to n
-NCO: n
-OH=1.46 NCO/OH equivalence ratio mixes, and leaves standstill 15min and gets final product.
Embodiment 4:
Wherein additive comprises components by weight percent content: film coalescence aid 2.1%, thickening material 0.55%, sanitas 0.15%, mould inhibitor 0.15%, antiblocking agent 0.2%.
The preparation method of embodiment 4 is:
A, preparation A component master lacquer: the water and the hydroxyl polyacrylate dispersion resin that at first in disperseing cylinder, add entry gross weight 12%, and the middling speed of carrying out 700r/min is disperseed, evenly sneak into again dispersion agent, glass powder, after 30 minutes, add scratch resistance wax assistant, organo-bismuth/zinc composite catalyst, defoamer, wetting agent and other components with the high speed dispersion of l200r/min, middling speed was disperseed after 20 minutes, sampling detects finish fineness and viscosity, filter tinning, packing;
B, preparation B component solidifying agent: in disperseing cylinder, add successively propylene-glycol ethyl ether acetic ester, allophanate-modified HDI tripolymer, mix and get final product;
C, preparation dual-component aqueous polyurethane woodenware lacquer: with A component and B component according to n
-NCO: n
-OH=1.50 NCO/OH equivalence ratio mixes, and leaves standstill 15min and gets final product.
Embodiment 5:
Wherein additive comprises components by weight percent content: film coalescence aid 2.7%, thickening material 0.4%, sanitas 0.15%, mould inhibitor 0.15%, antiblocking agent 0.1%.
The preparation method of embodiment 5 is:
A, preparation A component master lacquer: the water and the hydroxyl polyacrylate dispersion resin that at first in disperseing cylinder, add entry gross weight 18%, and the middling speed of carrying out 700r/min is disperseed, evenly sneak into again dispersion agent, glass powder, after 30 minutes, add scratch resistance wax assistant, organo-bismuth/zinc composite catalyst, defoamer, wetting agent and other components with the high speed dispersion of 1200r/min, middling speed was disperseed after 20 minutes, sampling detects finish fineness and viscosity, filter tinning, packing;
B, preparation B component solidifying agent: in disperseing cylinder, add successively propylene-glycol ethyl ether acetic ester, allophanate-modified HDI tripolymer, mix and get final product;
C, preparation dual-component aqueous polyurethane woodenware lacquer: with A component and B component according to n
-NCO: n
- OH=1.53 NCO/OH equivalence ratio mixes, and leaves standstill 15min and gets final product.
Embodiment 6:
Wherein additive comprises components by weight percent content: film coalescence aid 2%, thickening material 0.3%, sanitas 0.3%, antiblocking agent 0.2%.
The preparation method of embodiment 6 is:
A, preparation A component master lacquer: the water and the hydroxyl polyacrylate dispersion resin that at first in disperseing cylinder, add entry gross weight 10%, and the middling speed of carrying out 700r/min is disperseed, evenly sneak into again dispersion agent, glass powder, after 30 minutes, add scratch resistance wax assistant, organo-bismuth/zinc composite catalyst, defoamer, wetting agent and other components with the high speed dispersion of 1200r/min, middling speed was disperseed after 20 minutes, sampling detects finish fineness and viscosity, filter tinning, packing;
B, preparation B component solidifying agent: in disperseing cylinder, add successively propylene-glycol ethyl ether acetic ester, allophanate-modified HDI tripolymer, mix and get final product;
C, preparation dual-component aqueous polyurethane woodenware lacquer: with A component and B component according to n
-NCO: n
- OH=1.62 NCO/OH equivalence ratio mixes, and leaves standstill 15min and gets final product.
The test result of embodiment 1-6 sees Table 2:
Table 2:
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 |
| Hardness of paint film | 2H | 2H | 2H | 2H | 2H | 2H |
| Glossiness | 75° | 72° | 76° | 74° | 78° | 75° |
| Surface drying (min) | 45 | 50 | 45 | 43 | 46 | 40 |
| Do solid work (h) | 6 | 6.5 | 6 | 6 | 6 | 5.5 |
| Pot-life (h) | 4 | 4 | 4 | 4 | 4 | 4 |
| TVOC(g/L） | 170 | 168 | 162 | 165 | 165 | 160 |
Claims (8)
1. high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer is characterized in that composed of the following components by weight percentage:
A component: main lacquer
Wherein the weight percent sum of A component is absolutely,
B component: solidifying agent
Propylene-glycol ethyl ether acetic ester 12%～16%
Allophanate-modified HDI tripolymer 84%～88%,
Wherein the weight percent sum of B component is absolutely,
A component and B component are according to n
-NCO: n
-OH=1.38～1.62 equivalent mol ratio is mixed.
2. a kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer according to claim 1 is characterized in that described scratch resistance wax assistant is the polytetrafluoroethylmodified modified polyethylene wax of micronization.
3. a kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer according to claim 1 is characterized in that described glass powder is nanometer grade silica glass powder.
4. a kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer according to claim 1 is characterized in that described additive is the mixture more than 4 kinds in sanitas, thickening material, film coalescence aid, mould inhibitor, antiblocking agent or the flow agent.
5. a kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer according to claim 4 is characterized in that described sanitas is the isothiazolinone biocide agent, and its content is 0.1～0.3%; Described thickening material is non-ionic associative type polyurethane thickening material, and its content is 0.3～0.9%; Described film coalescence aid is dipropylene glycol methyl ether, and its content is 2～5%; Described mould inhibitor is dichloro octyl group isothiazolinone, and its content is 0.1～0.3%; Described antiblocking agent is the high molecular aqueous emulsion of dimethyl polysiloxane fluid, and its content is 0.1～0.3%; Described flow agent is polyether siloxane copolymer, and its content is 0.05～0.1%; Wherein said content is the weight percentage with respect to the varnish gross weight.
6. the preparation method of each described a kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer among the claim 1-5 is characterized in that comprising following processing step:
A, preparation A component master lacquer: the water and the hydroxyl polyacrylate dispersion resin that at first in disperseing cylinder, add entry gross weight 10%～20%, and carry out middling speed and disperse, evenly sneak into again dispersion agent, glass powder, after the high speed dispersion 15～30 minutes, add scratch resistance wax assistant, organo-bismuth/zinc composite catalyst, defoamer, wetting agent and other components, middling speed was disperseed after 15～25 minutes, sampling detects finish fineness and viscosity, filter tinning, packing;
B, preparation B component solidifying agent: in disperseing cylinder, add successively propylene-glycol ethyl ether acetic ester, allophanate-modified HDI tripolymer, mix and get final product;
C, preparation dual-component aqueous polyurethane woodenware lacquer: with A component and B component according to n
-NCO: n
- OH=1.38～1.62 equivalence ratio mixes, and leaves standstill 15min and gets final product.
7. the preparation method of a kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer according to claim 6 is characterized in that the speed that described middling speed is disperseed is 600～800r/min; The speed of described high speed dispersion is 1000～l500r/min.
8. the preparation method of a kind of high rigidity scratch resistance dual-component aqueous polyurethane woodenware lacquer according to claim 6 is characterized in that described A component finish fineness is 20～35um, and described finished product viscosity is 80～110s.
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