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CN103694872B - A kind of aqueous Stripable paint compositions - Google Patents

A kind of aqueous Stripable paint compositions Download PDF

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CN103694872B
CN103694872B CN201210373391.2A CN201210373391A CN103694872B CN 103694872 B CN103694872 B CN 103694872B CN 201210373391 A CN201210373391 A CN 201210373391A CN 103694872 B CN103694872 B CN 103694872B
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aliphatic
dispersion
content
paint compositions
stripable paint
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CN103694872A (en
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于典
崔静娜
罗文海
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BYD Co Ltd
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BYD Co Ltd
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Abstract

The invention provides a kind of aqueous Stripable paint compositions, this coating composition contains aliphatic polyurethane dispersion, aliphatic poly ester dispersion, coalescents and water, aliphatic polyurethane dispersion relative to 100 weight portions, the content of described aliphatic poly ester dispersion is 10 40 weight portions, the content of described coalescents is 10 25 weight portions, and the content of described water is 5 10 weight portions.The film layer of preparation has good water-fast, acid and alkali-resistance and weather resistance, stripping performance is good, can large area entirety peel off, may be used for the provisional protection of product and parts, and the flexility of film is good, be processed further (as CNC, polish, washing etc.) time paint film property good without impact, the coating that simultaneously prepared by the coating composition of the present invention can be applied on the base materials such as plastic cement, metal, glass, coating can pass through dip-coating, brush and the simple process such as spraying is attached on base material, technique is simply easily achieved, and environmental friendliness.

Description

A kind of aqueous Stripable paint compositions
Technical field
The present invention relates to a kind of aqueous Stripable paint compositions.
Background technology
Strippable protective coating as a kind of temporary protective coating can avoid equipment, parts etc. transport, storage and Assembling process is scratched, damages, weares and teares, pollutes or is produced by the corrosion function of microorganism, greasy dirt, salt fog, moisture etc. Electrochemical corrosion and chemical attack, make equipment surface fracture, hydraulic performance decline, even lost efficacy and scrap, thus extend equipment and use Life-span or raising product yield.Stripable paint due to its excellent performance have premium properties and be widely used in electronics, automobile, The fields such as machinery, building, medical treatment.But it is along with the development of technology, more and more higher to the performance of peelable protective coating, particularly At electronic applications, for avoiding parts are processed further (such as CNC, polish, washing etc.) and cause product to scratch, need A kind of pliability and the suitable peelable protective coating of adhesion property.
Existing disclosed just like patent CN02822399, a kind of aqueous coating agent as Stripable paint, comprise 48-88 At least one aqueous emulsion polymer of weight %, one or more of 2-20 weight % are used as the polymer dispersion of abrasive media Nertralizer that body, at least one pigment of 10-50 weight %, and selectivity contain, auxiliary agent, additive etc., wherein, disclose one Planting or the multiple polymeric dispersions as abrasive media is aqueous twice dispersing body, preferably without solvent, example can be Acrylic resin, alkyd resin, epoxy resin, polyester resin and polyurethane resin, specifically disclosed have no-solvent polyurethane-poly- Crylic acid ester mixture dispersion, solvent-free dispersions of polyurethanes be (the most relatively hard and relatively soft polyurethane Combination), but the pliability of film for preparing of the method and stripping performance be not suitable for being processed further.Also just like patent The water-based paint compositions of a CN201010592499 strippable coating protecting film, including synthetic resin emulsion (60-90 part), attached Put forth effort regulator (1-3 part), color stuffing (5-10 part), defoamer (0.5-1.5 part), dispersant (0.3-1.2 part), thickening agent (1.0-3.0 part), preservative (0.02-0.1 part), ethanol (7-15 part), deionized water (7-15 part), synthetic resin emulsion uses Hard emulsion and soft emulsion compounding, but the film layer resistance to water prepared of said composition and solvent resistance are undesirable, and above-mentioned coating The pliability of coating prepared by compositions and adhesiveness not up to desirable, be not suitable for being processed further, as in CNC process Middle existence plays lousiness, crimping during polishing, the problem such as the most water-fastness.
Summary of the invention
The present invention is to solve pliability and the adhesion of film layer prepared by the aqueous Stripable paint compositions of prior art The technical problem that property is undesirable, it is provided that one can prepare pliability and adhesiveness is good, acidproof, alkaline-resisting, water-fast, heat-resisting and ageing-resistant The aqueous Stripable paint compositions of the film layer that excellent performance is easily peeled simultaneously.
The invention aims to provide a kind of aqueous Stripable paint compositions, this coating composition contains aliphatic Dispersions of polyurethanes, aliphatic poly ester dispersion, coalescents and water, disperse relative to the aliphatic polyurethane of 100 weight portions Body, the content of described aliphatic poly ester dispersion is 10-40 weight portion, and the content of described coalescents is 10-25 weight portion, institute The content stating water is 5-10 weight portion.
The aqueous each Substance Interactions of Stripable paint compositions of the present invention, containing special ratios individually defined thing of the present invention Film layer prepared by the coating composition of matter kind has good water-fast, acid and alkali-resistance and weather resistance, and stripping performance is good, can be big Area entirety is peeled off, and may be used for the provisional protection of product and parts, and the flexility of film is good, be processed further (as CNC, polish, washing etc.) time paint film property good without impact, the coating that simultaneously prepared by the coating composition of the present invention can be applied On the base materials such as plastic cement, metal, glass, coating can pass through dip-coating, brush and the simple process such as spraying is attached on base material, technique Simply it is easily achieved, and environmental friendliness.
Detailed description of the invention
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearer, below to this Invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, not For limiting the present invention.
The present invention provides a kind of aqueous Stripable paint compositions, and this coating composition contains aliphatic polyurethane dispersion Body, aliphatic poly ester dispersion, coalescents and water, relative to the aliphatic polyurethane dispersion of 100 weight portions, described fat The content of adoption ester dispersion is 10-40 weight portion, and the content of described coalescents is 10-25 weight portion, the content of described water For 5-10 weight portion, the film layer pliability of preparation and adhesiveness are good, and acidproof, alkaline-resisting, water-fast, heat-resisting and ageing-resistant performance is excellent same Time be easily peeled.
Preferably, relative to the aliphatic polyurethane dispersion of 100 weight portions, the content of described aliphatic poly ester dispersion is 15-30 weight portion, the content of described coalescents is 10-25 weight portion, and the content of described water is 5-10 weight portion.
Wherein, aliphatic polyurethane dispersion refers to aliphatic polyurathane emulsion, is by aliphatic polyurethane granule and water group The uniform particle suspension liquid become, general solid content is 34wt%-45wt%.Preferably, aliphatic polyurethane dispersion is for containing just The aliphatic anion fatty acid modified polyurethane dispersion of property structure, itself and other material phase interactions in coating composition With, improve the hardness of film layer.Wherein, rigid structure refer generally to can not the group of Bending Rotation, such as circulus, alkynyl Deng, the preferred rigid structure of the present invention contains ring-type knot selected from the group containing circulus and/or alkynyl, i.e. aliphatic polyurethane Structure and/or alkynyl, circulus can be three-membered ring, four-membered ring, five-membered ring or hexatomic ring etc., further preferably, aliphatic poly Urethane structure contains the group of circulus.
Preferably, in fat race dispersions of polyurethanes, the number-average molecular weight of aliphatic polyurethane is more than 50000, aliphatic polyurethane Vitrification point less than 50 DEG C, more preferably 20-45 DEG C.Preferably, aliphatic poly ammonia in aliphatic polyurethane dispersion The mean particle size of ester is 50-200nm.Aliphatic polyurethane is the dispersion present invention can also be commercially available, such as, visit The UH2593/1 of ear, Yantai ten thousand China Lacper 4110, Lacper 4210 etc..
Wherein, aliphatic poly ester dispersion refers to aliphatic polyester emulsion, by aliphatic polyester granule and water form equal Even particle suspension liquid, general solid content is 35wt%-45wt%.Preferably, aliphatic poly ester dispersion is containing backbone Aliphatic anionic polyester dispersion, itself and other matter interactions in coating composition, improve the pliability of film layer. Wherein, backbone is preferably-(C-C)n-, i.e. aliphatic polyester contains-(C-C)n-long-chain linear macromolecular structure, wherein, n is Integer more than 10.Preferably, the number-average molecular weight of the aliphatic polyester in aliphatic poly ester dispersion is more than 30000, aliphatic The vitrification point of polyester is less than 50 DEG C, more preferably 10-30 DEG C, it is preferable that aliphatic polyester is air dry film-forming type fat Adoption ester.Aliphatic poly is the ester dispersion present invention can be commercially available, the UH240 of such as Bayer, Yantai ten thousand China Tekspro 7350 etc..
Coalescents is the present invention do not limit, the various coalescents that can be known to the skilled person, the present invention Preferably one or more in butyl glycol ether, propylene glycol monomethyl ether or dipropylene glycol methyl ether of coalescents.
In order to improve the viscosity of coating, the mobile performance of adjusting coating, improves the performance that can be coated of coating, preferred coatings group Compound is possibly together with thickening agent, and thickening agent is the present invention do not limit, the various thickening agents that can be known to the skilled person, excellent Select one or more that thickening agent is selected from polyurethane thickener, carboxycellulose, polyvinyl alcohol or acrylic compounds, thickening agent The present invention can be commercially available, and ViscoPlus 3030, TEGO company that such as TEGO company produces produce ViscoPlus 3060 etc..Relative to the aliphatic polyurethane dispersion of 100 weight portions, the content of described thickening agent is 0.1-1 Weight portion, more preferably 0.2-0.8 weight portion.
In order to improve painting effect and the product quality of coating composition, it is preferable that coating composition is possibly together with defoamer, excellent Choosing, defoamer is selected from polyether silicone copolymer emulsion and/or polymethyl siloxane copolymer emulsion, and the defoamer present invention can pass through Being commercially available, Foamex 825, TEGO company that the Foamex 800 of such as TEGO company production, TEGO company produce are raw The Foamex 855 etc. produced.Relative to the aliphatic polyurethane dispersion of 100 weight portions, the content of described defoamer is 0.2-1 Weight portion, more preferably 0.2-0.8 weight portion.
Coating composition also can add various auxiliary agents, such as pigment, levelling agent etc. according to practical situation, preferably comprise face Material, pigment one or several in white carbon black, titanium dioxide, pearl essence, Margarita powder, aluminium paste, silver slurry, AZOpigments or phthalocyanine color Kind.The pigment present invention can be commercially available, 1533,1541,7005s and 1441 that such as Clariant Corporation produces;Moral is solid The white carbon black of Sa;CQV company of Korea S produce all kinds of pearl essences and chameleon powder, Merck KGaA company produce all kinds of pearl essences and Chameleon powder etc..Relative to the aliphatic polyurethane dispersion of 100 weight portions, the content of described pigment is 0.1-5 weight portion, enters One step is preferably 0.5-1.5 weight portion.
Aforementioned coating composition mixes to obtain coating, and aliphatic polyurethane can be disperseed by the preparation method of the coating of the present invention Body, aliphatic poly ester dispersion, coalescents and water carry out mixing simultaneously and can also mix step by step.In the preferred case, Ball mill, high speed dispersor or three rollers can be used to grind aliphatic polyurethane dispersion, the mixing of aliphatic poly ester dispersion Machine disperses, and under the mixing speed of 600r/min, is added dropwise over coalescents, adds water, selectively add defoamer, Thickening agent etc., mix homogeneously.Above-mentioned mixing is carried out the most at normal temperatures, if desired, can somewhat heat to accelerate mixing.
Film layer prepared by the coating composition that the present invention provides has good water-fast, acid and alkali-resistance and weather resistance, peels off Functional, large area entirety can peel off, may be used for the provisional protection of product and parts, and the flexility of film is good, Be processed further (as CNC, polish, washing etc.) time paint film property good without impact, simultaneously prepared by the coating composition of the present invention Coating can apply on the base materials such as plastic cement, metal, glass, coating can pass through dip-coating, brush and the simple process such as spraying is attached On base material, technique is simply easily achieved, and environmental friendliness.
Below in conjunction with specific embodiment, the present invention is further described.
Embodiment 1
(1) coating composition
UH2593/1 20g
UH240 3.5g
Butyl glycol ether 3g
Deionized water 1.5g
TEGO Foamex 825 0.2g
TEGO ViscoPlus 3060 0.2g
(2) mixing
20g UH2593/1 and 3.5g UH240 is mixed, under the mixing speed of 600r/min, is added dropwise over the second of 3g Glycol butyl ether;Treat that butyl glycol ether dropping is complete, add 1.5g deionized water, 0.2g TEGO Foamex 825,0.2g TEGO ViscoPlus 3060, mix homogeneously obtains coating sample S1.
Embodiment 2
Use method compo compositions same as in Example 1, except for the difference that coating composition, specific as follows:
Lacper 4110 20g
Tekspro 7350 3.5g
Butyl glycol ether 3g
Deionized water 1.5g
TEGO Foamex 825 0.2g
TEGO ViscoPlus 3060 0.2g
Prepare coating sample S2.
Embodiment 3
Use method compo compositions same as in Example 1, except for the difference that coating composition, specific as follows:
Lacper 4210 20g
Tekspro 7350 3.5g
Butyl glycol ether 3g
Deionized water 1.5g
TEGO Foamex 825 0.2g
TEGO ViscoPlus 3060 0.2g
Prepare coating sample S3.
Embodiment 4
Use method compo compositions same as in Example 1, except for the difference that coating composition, specific as follows:
UH2593/1 20g
Tekspro 7350 3.5g
Butyl glycol ether 3g
Deionized water 1.5g
TEGO Foamex 825 0.2g
TEGO ViscoPlus 3060 0.2g
Prepare coating sample S4.
Embodiment 5
Use method compo compositions same as in Example 1, except for the difference that coating composition, specific as follows:
UH2593/1 20g
UH240 4g
Butyl glycol ether 3.2g
Deionized water 1.8g
TEGO Foamex 825 0.2g
TEGO ViscoPlus 3060 0.2g
Prepare coating sample S5.
Embodiment 6
Use method compo compositions same as in Example 1, except for the difference that coating composition, specific as follows:
UH2593/1 20g
UH240 5g
Butyl glycol ether 3.5g
Deionized water 2g
TEGO Foamex 825 0.2g
TEGO ViscoPlus 3060 0.2g
Prepare coating sample S6.
Embodiment 7
Use method compo compositions same as in Example 1, except for the difference that coating composition, specific as follows:
UH2593/1 20g
UH240 2.5g
Butyl glycol ether 2.5g
Deionized water 1.2g
TEGO Foamex 825 0.2g
TEGO ViscoPlus 3060 0.2g
Prepare coating sample S7.
Comparative example 1
C by the embodiment of patent CN02822399) present invention coating preparation (embodiment 1 preparation containing water and milk Liquid polymer, the dispersions of polyurethanes UA of embodiment 7 preparation and the polymer of the dispersions of polyurethanes UB mixing of embodiment 8 preparation Dispersion) step prepares coating sample DS1.
Comparative example 2
Coating sample DS2 is prepared according to the embodiment 4 of patent CN201010592499.
Embodiment 3
Coating sample DS3 is prepared according to the embodiment 3 of patent CN201010291366.
Performance test:
Coating sample S1-S7 and DS1-DS3 of above-mentioned preparation is respectively adopted the mode of spraying be coated in 6cm × 9cm × On the PC plate of 1.5cm, toasting 30min and be dried under the conditions of 50 DEG C, film layer is 30-45nm, obtains test sample S11-S77 and DS11- DS33。
(1) stripping performance: by test sample S11-S77 of above-mentioned preparation and DS11-DS33 respectively at ambient temperature be 0 DEG C, 20 DEG C, under conditions of 40 DEG C, use adhesive tape to stick up whether test film layer is easily peeled.
Wherein, ◎ is easily peeled;Zero stripping performance is good;Peel off difficulty, it is impossible to completely strip;× can not peel off.
(2) CNC(Digit Control Machine Tool processing) test: the superficial film of test sample S11-S77 and DS11-DS33 is carried out CNC cuts, and observes edge with or without tilting, lousiness, film layer with or without phenomenon of rupture.
◎ edge without tilt, without lousiness, protecting film without phenomenon of rupture;× edge has tilting or lousiness or protecting film to have disconnected Split phenomenon.
(3) acid resistance: the sulphuric acid of 40wt% is dripped 2ml on the superficial film of sample S11-S77 and DS11-DS33, in Keeping 24 hours under the conditions of 25 DEG C, observing film surface has blister corrosion phenomenon.
◎ surface is without blister corrosion phenomenon;× there is blister corrosion phenomenon.
(4) alkaline resistance properties: the sodium hydroxide of 0.1 normal concentration is dropped in the skin covering of the surface of sample S11-S77 and DS11-DS33 On layer, keeping 24 hours under the conditions of 25 DEG C, observing film surface has blister corrosion phenomenon.
◎ surface is without blister corrosion phenomenon;× there is blister corrosion phenomenon.
(5) water resistance: the superficial film of water pouring sample S11-S77 and DS11-DS33 3 days, discharge 4.5L/min, sees Examine whether film layer bubbles, ftractures, if can completely strip.
◎ is non-foaming, do not rupture, can completely strip, × bubble or ftracture and maybe can not peel off.
(6) heat resistance: be placed on by sample S11-S77 and DS11-DS33 in 80 DEG C of baking ovens, toasts 7 days, observes film layer and is No variable color, cracking, whether film layer can completely strip.
◎ invariant color, not rupturing, can completely strip, × variable color or cracking maybe can not be peeled off.
(7) 1000h accelerated ageing performance: by sample S11-S77 and DS11-DS33 according to GB/T 1,865 1997 " color Paint and varnish artificial weathering aging and man-made radiation expose " carry out artificial weathering test 1000h.Whether observe film layer Cracking, if variable color, whether completely strip, film layer has no adverse effects.
× paint film cracking or variable color maybe can not completely strip.◎ invariant color, do not ftracture, be completely easily peeled off, without bad shadow Ring.
Test result such as table 1
Table 1
  Removability CNC processing experiment Acid resisting test Alkaline resistance test Resistance to water is tested Heat-resistance test Anti-aging test
S11
S22
S33
S44
S55
S66
S77
DS11 ×
DS22 × ×
DS33 × ×
Film layer prepared by the coating composition that the one-tenth of the coating composition of the present invention is grouped into has good water-fast, acidproof Alkali and weather resistance, stripping performance is good, large area entirety can peel off, may be used for the provisional protection of product and parts, and The flexility of film is good, be processed further (as CNC, polish, washing etc.) time paint film property good without impact, the present invention simultaneously The coating prepared of coating composition can apply on the base materials such as plastic cement, metal, glass, coating can pass through dip-coating, brushing and The simple process such as spraying are attached on base material, and technique is simply easily achieved, and environmental friendliness.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.

Claims (11)

1. an aqueous Stripable paint compositions, it is characterised in that described coating composition contains aliphatic polyurethane dispersion Body, aliphatic poly ester dispersion, coalescents and water, relative to the aliphatic polyurethane dispersion of 100 weight portions, described fat The content of adoption ester dispersion is 10-40 weight portion, and the content of described coalescents is 10-25 weight portion, the content of described water It is 5-10 weight portions;Described aliphatic polyurethane dispersion is that the aliphatic anion containing rigid structure is fatty acid modified poly- Urethane dispersion;Described aliphatic poly ester dispersion is the aliphatic anionic polyester dispersion containing backbone.
Stripable paint compositions the most according to claim 1, it is characterised in that relative to the aliphatic of 100 weight portions Dispersions of polyurethanes, the content of described aliphatic poly ester dispersion is 15-30 weight portion, and the content of described coalescents is 10- 25 weight portions, the content of described water is 5-10 weight portion.
Stripable paint compositions the most according to claim 1, it is characterised in that described rigid structure is selected from containing ring-type The group of structure and/or alkynyl.
Stripable paint compositions the most according to claim 1, it is characterised in that in described aliphatic polyurethane dispersion The number-average molecular weight of aliphatic polyurethane is more than 50000, and the vitrification point of aliphatic polyurethane is less than 50 DEG C.
Stripable paint compositions the most according to claim 1, it is characterised in that in described aliphatic polyurethane dispersion The mean particle size of aliphatic polyurethane is 30-100nm.
Stripable paint compositions the most according to claim 1, it is characterised in that in described aliphatic poly ester dispersion Aliphatic polyester contains-(C-C)n-long-chain linear macromolecular structure, wherein, n is the integer more than 10.
Stripable paint compositions the most according to claim 1, it is characterised in that in described aliphatic poly ester dispersion The number-average molecular weight of aliphatic polyester is more than 30000, and the vitrification point of aliphatic polyester is less than 50 DEG C, and aliphatic polyester is gas Dry film-forming type aliphatic polyester.
Stripable paint compositions the most according to claim 1, it is characterised in that described coalescents is selected from ethylene glycol fourth One or more in ether, propylene glycol monomethyl ether or dipropylene glycol methyl ether.
Stripable paint compositions the most according to claim 1, it is characterised in that described coating composition is possibly together with thickening Agent, one or more in polyurethane thickener, carboxycellulose, polyvinyl alcohol or acrylic compounds of described thickening agent, Relative to the aliphatic polyurethane dispersion of 100 weight portions, the content of described thickening agent is 0.1-1 weight portion.
Stripable paint compositions the most according to claim 1, it is characterised in that described coating composition is possibly together with disappearing Infusion, described defoamer is selected from polyether silicone copolymer emulsion and/or polymethyl siloxane copolymer emulsion, relative to 100 weight The aliphatic polyurethane dispersion of part, the content of described defoamer is 0.2-1 weight portion.
11. Stripable paint compositionss according to claim 1, it is characterised in that described coating composition is possibly together with helping Agent, described auxiliary agent includes pigment, and described pigment is selected from white carbon black, titanium dioxide, pearl essence, Margarita powder, aluminium paste, silver slurry, AZOpigments Or one or more in phthalocyanine color, relative to the aliphatic polyurethane dispersion of 100 weight portions, the content of described pigment is 0.1-5 weight portion.
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JP2016069633A (en) * 2014-09-30 2016-05-09 株式会社ネオス Aqueous primer composition for coating material peeling and coating material peeling method
ES2704919T3 (en) * 2015-02-10 2019-03-20 Daw Se Aqueous coating masses that can drip, in particular dispersion coating masses, as well as a test device for determining the splash behavior of aqueous coating compositions that can drip
CN104877538B (en) * 2015-05-19 2018-04-20 上海化工研究院有限公司 A kind of water-based peelable polyurethane coating and preparation method thereof
CN105713499A (en) * 2015-12-18 2016-06-29 广州源辉化工有限公司 Water-based strippable coating and film forming method thereof
CN105462323A (en) * 2016-01-11 2016-04-06 惠阳区施美克化工有限公司 Peelable chemical-erosion-resistant protective paint and preparation method and application thereof
CN107779070A (en) * 2017-10-27 2018-03-09 江苏中瀛涂料有限公司 A kind of water-based Stripable paint and preparation method thereof
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CN110684450A (en) * 2019-09-25 2020-01-14 复旦大学 A kind of water-based protective coating with peelability and preparation method thereof
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