CN103360894A - Waterborne paint and preparation method thereof - Google Patents
Waterborne paint and preparation method thereof Download PDFInfo
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- CN103360894A CN103360894A CN2012100838683A CN201210083868A CN103360894A CN 103360894 A CN103360894 A CN 103360894A CN 2012100838683 A CN2012100838683 A CN 2012100838683A CN 201210083868 A CN201210083868 A CN 201210083868A CN 103360894 A CN103360894 A CN 103360894A
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Abstract
The invention provides a waterborne paint, comprising a component A and a component B, wherein the component A comprises the following materials: 11.5-17.5 wt% of waterborne curing agent, 0.5-4 wt% of assistant, 45.1-61.5 wt% of pigment and the balance of water on the basis of total mass of the component A; the assistant contains a dispersing agent; the dispersing agent is polymeric carboxylic acid salt; the molecular weight of the polymeric carboxylic acid salt is 1,000-20,000; the acid value is 80-200 mgKOH/g; and the component B is epoxy resin. The invention also provides a preparation method of the waterborne paint. The waterborne paint provided by the invention is good in pigment dispersity by adopting the polymeric carboxylic acid salt as the dispersing agent and not adopting an organic solvent or a cosolvent at all, so that the waterborne paint disclosed by the invention is high in storage stability; and the formed paint film after being cured is smooth and compact in surface.
Description
Technical field
The invention belongs to the coating composition technical field, be specifically related to a kind of aqueous primer surfacer and preparation method thereof.
Background technology
Terrace paint is widely used in the modern workshop building, is not subjected to the corrosion of various soda acids, organism and water to guarantee concrete floor.At present, generally in the floor construction adopt three layers of finishing system, namely priming paint, in be coated with and finish paint.In the effect that is coated be mainly and hide the substrate surface defective, the levelling basal plane provides fine and close reasonably surface to promote sticking power and the gloss of finish paint.The middle japanning of at present widespread use mostly is greatly the solvent-borne type product, and the solvent that adopts is mainly the various volatile organic solvents such as substituted benzene, ethers, and there is harm in HUMAN HEALTH, therefore gradually is coated with product in the water-based and replaces.
There is following defective in the people in the product and be coated with in the water-based of prior art: although 1 titled with " water-based " label, still adopt organic solvent as solubility promoter in the prescription; 2, formed coating surface is more coarse after the curing, and porosity is higher, is difficult to play the sealing process to the contained steam of base material, causes finish paint paint film bubbling even cracking; 3, sedimentation more easily occuring, is difficult to long storage.
Summary of the invention
The invention solves and be coated with the coarse technical problem of coating surface that product adopts volatile organic solvent, easily sedimentation occurs and solidify to form in the prior art in the water-based.
The invention provides a kind of aqueous primer surfacer, described aqueous primer surfacer is comprised of A component and B component;
Take the total mass of A component as benchmark, the consisting of of described A component: waterborne curing agent 11.5-17.5wt%, dispersion agent 0.5-1wt%, pigment 45.1-61.5wt%, auxiliary agent 1.5-3wt%, surplus is water; Described dispersion agent is polymeric carboxylic salt, and the molecular weight of described polymeric carboxylic salt is 1000-20000, and acid number is 80-200mgKOH/g;
Described B component is Resins, epoxy.
The present invention also provides the preparation method of described aqueous primer surfacer, comprises preparing respectively A component and B component; Wherein, the method for preparation A component is: first waterborne curing agent is scattered in the water, then adds in proportion auxiliary agent and dispersion agent, mix; Add again pigment in batches and mix, obtain described A component.
Aqueous primer surfacer provided by the invention is the epoxypaint system, compares with existing middle japanning, has following having a few:
(1) do not contain organic solvent or solubility promoter, all adopt water as dispersion medium, HUMAN HEALTH is not threatened;
(2) adopt polymeric carboxylic salt as dispersion agent, it has good affinity with glassware for drinking water as dispersion medium on the one hand, and its macromolecular chain can extend to the thicker adsorption layer of formation in the water; On the other hand since in the polymeric carboxylic salt active carboxylic acid's group of containing more, firm adsorption pigment particle, thereby the fully dispersion in water of each component in the coating; In addition, carboxyl has larger polarity, and at the inner hydrogen bond that forms of coating system, the suspended state that guarantee system is stable, thereby the package stability of raising coating prevent that it from sedimentation occuring;
(3) among the present invention by adopting polymeric carboxylic salt as dispersion agent so that pigment can all have dispersion in aqueous primer surfacer, can form smooth smooth and paint film that compactness is high after therefore solidifying.
Embodiment
The invention provides a kind of aqueous primer surfacer, described aqueous primer surfacer is comprised of A component and B component;
Take the total mass of A component as benchmark, the consisting of of described A component: waterborne curing agent 11.5-17.5wt%, dispersion agent 0.5-1wt%, pigment 45.1-61.5wt%, auxiliary agent 1.5-3wt%, surplus is water; Described dispersion agent is polymeric carboxylic salt, and the molecular weight of described polymeric carboxylic salt is 1000-20000, and acid number is 80-200mgKOH/g;
Described B component is Resins, epoxy.
The present inventor finds by great many of experiments, be coated with in the existing water-based and cause the reason of aforementioned technical problem to be mainly in the product: 1, be coated with in the product dispersion system in the existing water-based unreasonable, thereby the solubility promoter that need to add improves the wetting situation between the solid-liquid two-phase, can introduce the organic solvent component again but add solubility promoter; 2, be coated with product self in the water-based not evenly continuously, cause solidifying rear paint film coarse, porosity is higher; 3, be coated with emulsification system in the water-based unstable, sedimentation easily occurs.
The present invention is directed to above defective, the present inventor suitably selects each component in the coating system, so that aqueous primer surfacer of the present invention is difficult for occuring sedimentation, and can form smooth paint film after solidifying.Particularly, the present invention is by adopting polymeric carboxylic salt as dispersion agent in the epoxypaint system, it on the one hand has good affinity with glassware for drinking water as dispersion medium, its macromolecular chain can extend to the thicker adsorption layer of formation in the water, because polymeric carboxylic class dispersion agent has the solvation segment of certain-length in dispersion medium water, when the pigment that is adsorbed is mutually close, can produce steric hindrance between the solvation segment, stop pigment generation closer to each other to be returned slightly, thereby prevent sedimentation; Adopt on the other hand polymeric carboxylic salt as dispersion agent among the present invention, its adsorption site is not single, but is mutually acted synergistically by a plurality of adsorption sites, thereby promotes adsorption effect, firmly the adsorption pigment particle guarantees that each component in the coating is fully disperseed in water; In addition, carboxyl has larger polarity, at the inner hydrogen bond that forms of coating system, and the suspended state that guarantee system is stable, thereby the package stability of raising coating, and prevent that it from sedimentation occuring.Pigment obtains Uniform Dispersion in coating system after, can guarantee to solidify the paint film of the smooth smooth and high-compactness of rear formation.
As a kind of preferred implementation of the present invention, described polymeric carboxylic salt adopts the alkanolamine salt of polymeric carboxylic, and its amine value is 45-130mgKOH/g.
Among the present invention, can directly adopt as the polymeric carboxylic salt of dispersion agent to be purchased product, for example can adopt the Afcona5071 of Afcona company, the composition that wherein plays a major role is the alkanolamine salt of polymeric carboxylic, its acid number is 90-110mgKOH/g, and the amine value is 95-130mgKOH/g.
Among the present invention, described waterborne curing agent is one of film-forming components, by the Resins, epoxy reaction film forming of itself and B component.In addition, described waterborne curing agent also is used for providing the emulsification environment of A component.Among the present invention, described waterborne curing agent can directly adopt various aqueous polyamide class solidifying agent common in the prior art.Among the present invention, described waterborne curing agent also can directly adopt and be purchased product, for example can adopt Sumide WH-1000, Anquanmine-735 or the Anquamine-721 of Air Products company, but be not limited to this.
Among the present invention, described coating is the element of aqueous primer surfacer.As a further improvement on the present invention, described pigment comprises the first pigment and the second pigment.Wherein, the first pigment is used for giving painting color, strengthens coating to the opacifying power of base material.And the second pigment is not affecting under the prerequisite of coating to the opacifying power of base material, can also improve the mechanical property of coating, and reduces the coating cost, generally is referred to as volume pigment in the prior art.Described the first pigment can adopt anatase thpe white powder, but is not limited to this.Described the second pigment (being volume pigment) is selected from one or more of water-ground limestone, talcum powder, silicon powder, barium sulfate, 800 order sericites in powder.Wherein heavy carbonic acid matter can adopt water-ground limestone 828; Barium sulfate can adopt barium sulfate JLH-B1, but is not limited to this.
Under the preferable case, take the total mass of A component as benchmark, the content of the second pigment (being volume pigment) is 45-58.3wt%, and the content of the first pigment is 0.1-3wt%.
Among the present invention, described auxiliary agent can also contain in defoamer, flow agent and the thixotropic agent one or more except containing the dispersion agent that the present invention adopts.
Wherein, defoamer is avoided causing the paint machine degradation because of bubble for the bubble that produces in the cancellation japanning production process.Among the present invention, described defoamer can directly adopt and be purchased product, for example can be selected among CF-500, Afcona 2501, Afcona2502, the Afcona2524 one or more.Take the total mass of A component as benchmark, the content of defoamer is 0.5-1wt%.
Described flow agent is used for improving the planeness behind the film curing, improves surface detail density and the slickness of paint film.Among the present invention, described flow agent can directly adopt and be purchased product, for example can be selected from Afcona3570; One or both of Afcona3580.Take the total mass of A component as benchmark, the content of flow agent is 0.5-1wt%,
Described thixotropic agent is used for improving the thixotropic property of coating, in the inner hydrogen bond network that forms of coating, guarantees the package stability of aqueous primer surfacer of the present invention when coating is stored.When construction, hydrogen bond network is destroyed, and paint viscosity reduces, thereby has improved the workability of coating.Among the present invention, described thixotropic agent can adopt aerosil E-6 and/or aerosil 608L, but is not limited to this.Under the preferable case, take the total mass of A component as benchmark, the content of thixotropic agent is 0.5-1wt%.
As a kind of preferred implementation of the present invention, described auxiliary agent also contains defoamer, flow agent and thixotropic agent simultaneously.More preferably in the situation, take the total mass of A component as benchmark, the content of defoamer is 0.5-1wt%, and the content of flow agent is 0.5-1wt%, and the content of thixotropic agent is 0.5-1wt%.
As previously mentioned, in the aqueous primer surfacer provided by the invention, form paint film layer by the reaction of the waterborne curing agent in B component (being Resins, epoxy) and the A component, namely Resins, epoxy is one of main film-forming components.Described Resins, epoxy can adopt various Resins, epoxy common in the prior art, for example can adopt the NPEL-128 resin; One or both of YN1828P resin are composite.
Can thoroughly react for waterborne curing agent and B component (being Resins, epoxy) in the assurance A component, under the preferable case, the mass ratio of A component and B component is 8-12:1.
The present invention also provides the preparation method of described aqueous primer surfacer, comprises preparing respectively A component and B component.During practice of construction, A component and B component are mixed in proportion, then can be coated with and film-forming.
Wherein, the method for preparation A component gets final product for directly each feed composition in the A component being mixed in proportion.Under the preferable case, first waterborne curing agent is scattered in the water, then adds in proportion auxiliary agent and dispersion agent, mix; Add again pigment in batches and mix, obtain described A component.
As previously mentioned, described auxiliary agent comprises defoamer, flow agent and thixotropic agent.At this moment, the method for preparation A component is: first waterborne curing agent is scattered in the water, then adds successively defoamer, dispersion agent, flow agent and thixotropic agent, mix; Add again pigment in batches, mix and obtain described A component.
Among the present invention, for guaranteeing that waterborne curing agent can be dispersed in the water, under the preferable case, the mixing speed when waterborne curing agent is scattered in the water is 300-500RPM, and churning time is 10-20min.Similarly, for guaranteeing that auxiliary agent evenly mixes with waterborne curing agent-aqueous dispersion, under the preferable case, the mixing speed behind the adding auxiliary agent is 500-1000RPM, and churning time is 15-20min.Among the present invention, because the content of pigment is larger, so under the preferable case, the mixing speed behind the adding pigment is 1500-2000RPM, and churning time is 20-30min, is uniformly dispersed to guarantee pigment and other component, guarantees the package stability of coating.
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearer, below in conjunction with embodiment, the present invention is further elaborated.The raw material that adopts all is commercially available in embodiment and the Comparative Examples.
Embodiment 1
(1) waterborne curing agent is placed a mixing bowl, add deionized water and stirring 10min, mixing speed 300RPM.Then slowly add defoamer, dispersion agent, flow agent and thixotropic agent aerosil E-6, stir 15min to system even (mixing speed is 800PRM).Divide 5 batches to add the water-ground limestone powder again, stir 20min to system even (mixing speed is 1500PRM), obtain the A component of the present embodiment aqueous primer surfacer S1, proportioning raw materials is as shown in table 1.
(2) take by weighing the A component that 10 weight part steps (1) prepare, then take by weighing the Resins, epoxy NPEL-128 of 1 weight part as the B component of the present embodiment aqueous primer surfacer S1.
Table 1
Embodiment 2
(1) waterborne curing agent is placed a mixing bowl, add deionized water and stirring 10min, mixing speed 500RPM.Then slowly add defoamer, dispersion agent, flow agent and thixotropic agent aerosil 608L, stir 20min to system even (mixing speed is 500PRM).Divide 5 batches to add the water-ground limestone powder again, stir 30min to system even (mixing speed is 1500PRM), obtain the A component of the present embodiment aqueous primer surfacer S2, proportioning raw materials is as shown in table 2.
(2) take by weighing the A component that 10 weight part steps (1) prepare, then take by weighing the Resins, epoxy NPEL-128 of 1.2 weight parts as the B component of the present embodiment aqueous primer surfacer S2.
Table 2
。
Embodiment 3
(1) waterborne curing agent is placed a mixing bowl, add deionized water and stirring 10min, mixing speed 500RPM.Then slowly add defoamer, dispersion agent, flow agent and thixotropic agent aerosil E-6, stir 15min to system even (mixing speed is 1000RPM).Divide 5 batches to add the water-ground limestone powder again, stir 30min to system even (mixing speed is 1500RPM), obtain the A component of the present embodiment aqueous primer surfacer S3, proportioning raw materials is as shown in table 3.
(2) take by weighing the A component that 10 weight part steps (1) prepare, then take by weighing the Resins, epoxy NPEL-128 of 0.833 weight part as the B component of the present embodiment aqueous primer surfacer S3.
Table 3
Comparative Examples 1
Adopt the step identical with embodiment 1 to prepare the A component of the aqueous primer surfacer DS1 of this Comparative Examples, difference is: in the step (1), adopt the dispersant A fcona5071 in the fatty acid modified polyester alternate embodiment 1;
In the step (2), then take by weighing this A component of 10 weight parts, and the Resins, epoxy NPEL-128 that takes by weighing 1 weight part is as the B component.
Performance test:
A component and B component with step in each embodiment, the Comparative Examples mixes by the weight proportion in the step (2) respectively, is coated with after stirring, and solidify to form paint film.Then carry out following performance test:
(1) the A component of each embodiment preparation is carried out respectively the water bath with thermostatic control accelerated test, the time of rigid precipitation appears in record.
(2) estimate the surface condition of each paint film.
Test result is as shown in table 4.
Table 4
。
Can find out from the test result of upper table 4, do not contain organic solvent in the aqueous primer surfacer provided by the invention, pigment-dispersing is good, so its package stability is higher, and the smooth densification of coating surface that forms after solidifying, and obviously is better than the sample of Comparative Examples.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. an aqueous primer surfacer is characterized in that, described aqueous primer surfacer is comprised of A component and B component;
Take the total mass of A component as benchmark, the consisting of of described A component: waterborne curing agent 11.5-17.5wt%, auxiliary agent 0.5-4wt%, pigment 45.1-61.5wt%, surplus is water; Contain dispersion agent in the described auxiliary agent, described dispersion agent is polymeric carboxylic salt, and the molecular weight of described polymeric carboxylic salt is 1000-20000, and acid number is 80-200mgKOH/g;
Described B component is Resins, epoxy.
2. aqueous primer surfacer according to claim 1 is characterized in that, described polymeric carboxylic salt is the alkanolamine salt of polymeric carboxylic, and its amine value is 45-130mgKOH/g.
3. aqueous primer surfacer according to claim 1 is characterized in that, described waterborne curing agent is the aqueous polyamide solidifying agent.
4. aqueous primer surfacer according to claim 1 is characterized in that, described pigment comprises the first pigment and the second pigment; Take the total mass of A component as benchmark, the content of the second pigment is 45-58.3wt%, and the content of the first pigment is 0.1-3wt%.
5. aqueous primer surfacer according to claim 4 is characterized in that, the first pigment be that anatase thpe white powder, the second pigment are selected from one or more of water-ground limestone, talcum powder, silicon powder, barium sulfate, 800 order sericites in powder.
6. aqueous primer surfacer according to claim 1 is characterized in that, also contains one or more of defoamer, flow agent and thixotropic agent in the described auxiliary agent.
7. aqueous primer surfacer according to claim 6 is characterized in that, described auxiliary agent also contains defoamer, flow agent and thixotropic agent; Take the total mass of A component as benchmark, the content of defoamer is 0.5-1wt%, and the content of flow agent is 0.5-1wt%, and the content of thixotropic agent is 0.5-1wt%.
8. aqueous primer surfacer according to claim 1 is characterized in that, the mass ratio of A component and B component is 8-12:1.
9. the preparation method of aqueous primer surfacer claimed in claim 1 is characterized in that, comprises preparing respectively A component and B component; Wherein, the method for preparation A component is: first waterborne curing agent is scattered in the water, then adds in proportion auxiliary agent, mix; Add again pigment in batches and mix, obtain described A component.
10. preparation method according to claim 9 is characterized in that, also contains defoamer, flow agent and thixotropic agent in the described auxiliary agent; The method of preparation A component is: first waterborne curing agent is scattered in the water, then adds successively defoamer, dispersion agent, flow agent and thixotropic agent, mix; Add again pigment in batches, mix and obtain described A component.
11. according to claim 9 or 10 described preparation methods, it is characterized in that, the mixing speed when waterborne curing agent is scattered in the water is 300-500RPM, and churning time is 10-20min; Mixing speed behind the adding auxiliary agent is 500-1000RPM, and churning time is 15-20min; Mixing speed behind the adding pigment is 1500-2000RPM, and churning time is 20-30min.
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