CN106811048A - The peelable protective coating of modified silicasol and polyurethane latex composite compounding - Google Patents
The peelable protective coating of modified silicasol and polyurethane latex composite compounding Download PDFInfo
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- CN106811048A CN106811048A CN201510891910.8A CN201510891910A CN106811048A CN 106811048 A CN106811048 A CN 106811048A CN 201510891910 A CN201510891910 A CN 201510891910A CN 106811048 A CN106811048 A CN 106811048A
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Abstract
The invention discloses modified silicasol and the peelable protective coating of polyurethane latex composite compounding, it is obtained by the raw material of following mass fraction：Aromatic waterborne polyurethane emulsion 60 ~ 80%, Ludox 5 ~ 10%, talcum powder 3 ~ 8%, silicone emulsion 1 ~ 3%, acrylate copolymer ammonium salt solution 0.1 ~ 0.5%, alkali soluble is swollen acrylic thickener 0.5 ~ 1%, polyether polyester azo polyether polyeste 0.3 ~ 0.6%, acrylic acid copolymer sodium salt 0.1 ~ 0.5%, organic silicon modified by polyether 0.1 ~ 0.5%, balance of distilled water.From aromatic waterborne polyurethane emulsion and Ludox compounding as film forming matter, mechanical strength, strippable property and the tolerance to acid-base salt solution of coating can be improved.From talcum powder as filler, paint coatings can be prevented to be cracked, improve levelability, washability, water resistance of coating etc..The viscosity of dispersion can be improved from the swollen acrylic thickener of alkali soluble, increases the denseness of coating, improve the stability of coating.
Description
Technical field
The present invention relates to decorating field, more particularly, to modified silicasol and the peelable protective coating of polyurethane latex composite compounding.
Background technology
To prevent material or half product under the atmospheric environment to be contaminated, corrode and damage, and increase the service life, it will usually there is the coating of good protective and strippable property in their surface smear it is carried out effective and interim to seal protection up for safekeeping.In this way, can both isolate air, salt fog, the invasion of microorganism in the external world, antiseptic effect is reached；The effect of decontamination can be cleaned to reach by adsorbing pollutant again.For compared with solvent-borne type protective coating, aqueous protective coating has more security and the feature of environmental protection, thus is widely used in the decorating field of product.But, existing aqueous protective coating still has the shortcomings that coating strength is low, strippable property is poor and barrier propterty is single.
The content of the invention
The purpose of the present invention is the defect for overcoming above-mentioned prior art; the peelable protective coating of modified silicasol and polyurethane latex composite compounding is provided; effective closing protection can be carried out to protected object, has the advantages that stability is high, strippable property is good, coating strength is high and cohesive force is strong.
The purpose of the present invention is achieved through the following technical solutions：
Modified silicasol and the peelable protective coating of polyurethane latex composite compounding, are obtained by the raw material of following mass fraction：Aromatic waterborne polyurethane emulsion 60 ~ 80%, Ludox 5 ~ 10%, talcum powder 3 ~ 8%, silicone emulsion 1 ~ 3%, acrylate copolymer ammonium salt solution 0.1 ~ 0.5%, alkali soluble is swollen acrylic thickener 0.5 ~ 1%, polyether polyester azo polyether polyeste 0.3 ~ 0.6%, acrylic acid copolymer sodium salt 0.1 ~ 0.5%, organic silicon modified by polyether 0.1 ~ 0.5%, balance of distilled water；The aromatic waterborne polyurethane emulsion is obtained by the raw material of following quality proportioning：40 ~ 80 parts of toluene di-isocyanate(TDI), 40 ~ 80 parts of polypropylene glycol, 3 ~ 10 parts of dihydromethyl propionic acid, 50 ~ 80 parts of butanone, 5 ~ 12 parts of ethylenediamine, 3 ~ 11 parts of triethylamine, 1 ~ 3 part of dibutyl tin laurate, 40 ~ 80 parts of distilled water；The modified silicasol is obtained by the raw material of following quality proportioning：40 ~ 60 parts of alkaline silica sol, 30 ~ 50 parts of ethanol, 1 ~ 6 part of propyl trimethoxy silicane.
Aqueous protective coating is mainly made up of film forming matter, filler, auxiliary agent and solvent.Wherein, film forming matter is the nucleus of protective coating, and the present invention, as film forming matter, can improve stability, strippable property, mechanical strength and the tolerance to acid-base salt solution of coating from aromatic waterborne polyurethane emulsion and Ludox compounding.The following raw material is selected in the preparation of aromatic waterborne polyurethane emulsion：The reaction of isocyanate groups and hydroxyl is carried out from toluene di-isocyanate(TDI) and polypropylene glycol, can so assign coating film excellent mechanical property and barrier propterty.In the reaction, butanone is added to reduce the viscosity of primary product.Relatively it is used alone for dibutyl tin laurate, reaction rate can be significantly improved as catalyst from dibutyl tin laurate and triethylamine compounding, offsets the adverse effect of solvent effect.From ethylenediamine as chain extender, it can carry out chain extension to system, can so improve the tensile strength of coating film.
Stability during to improve alkaline silica sol with aromatic waterborne polyurethane latex composite compounding, the present invention has carried out surface modification treatment to alkaline silica sol.Wherein, from propyl trimethoxy silicane as silane coupler, diaphragm stabilization under room temperature environment can be enable to store 6 ~ 12 months and occur without gelatin phenomenon.The addition of Ludox can make in the nano-silica filled film to coating, and the segment of silica can constitute the network-like structure for mutually running through with the organic high molecular polymer in coating and talcum powder, so, the pliability of organic polymer can be improved, meanwhile, coating film bulk strength and hardness can also be improved.Because the permeability of Ludox is fabulous, it can be penetrated into inside protected base material so that coating film is securely attached on base material.Ludox can also improve the consistency of coating film, can so prevent moisture and other media from invading, and then improve the corrosion resistance of film.
Filler is indispensable part in formulation for coating material, and filling effect is played in coating.From talcum powder as filler, paint coatings can be prevented to be cracked, improve levelability, washability, water resistance of coating etc..Alkali soluble is swollen, and acrylic thickener can improve the viscosity of dispersion, be conducive to dispersion of the talcum powder in system, prevent talcum powder from sinking to luming；The denseness of coating can also be increased simultaneously, the stability of coating is improved.The base material adhesive force of adjusting coating film is capable of in the use of silicone emulsion, film is had preferable peeling effect.Used as wetting agent, it can reduce the surface tension of coating film to acrylate copolymer ammonium salt solution, coating film cissing phenomenon is occurred, is prevented from making application uneven because protected object is unclean with soaking base material, reduction well.Because filler all has hydrophobicity, thus their less stables in water, easily reunite and sink.And pass through to add acrylic acid copolymer sodium salt, then can keep dispersiveness of the filler in water.Polyether polyester azo polyether polyeste is used as levelling agent, it is possible to decrease the interfacial tension between coating and ground, improves the phenomenons such as coating is bad to shrinkage cavity that by the wetability of ground, reduction causes by ground, adhesive force.Coating is required for various artificial and mechanically actuateds in production, storage and work progress, foam is so easily caused to produce, and foam can hinder the dispersion of talcum powder, and film coated surface is caused to form pin hole and shrinkage cavity, so as to influence the outward appearance of coating film, anti-corrosive properties and weatherability.And add the organic silicon modified by polyether can be then effectively improved above mentioned problem.
To ensure isocyanate group-NCO and being smoothed out that the hydroxyl-OH reacts, further, the mol ratio of the isocyanate group-NCO and hydroxyl-OH is 2.2 ~ 3.6 in the raw material of the aromatic waterborne polyurethane emulsion:1.As-NCO/-OH ＜ 2.2, the viscosity of product can be increased, and be difficult dispersion；And as-NCO/-OH ＞ 3.6, the easy gel of aromatic waterborne polyurethane emulsion reduces storage period.
To reach good neutralization, further, the addition of the triethylamine and the dihydromethyl propionic acid equimolar amounts.
It is that balance is reached between adhesive force and peel strength, further, the Ludox is 1 with the mass ratio of the aromatic waterborne polyurethane emulsion:4.The consumption of Ludox directly affects the combination property and production cost of coating.Specifically, when the addition of Ludox is excessive, not only result in film and become fragile, film adhesive is excessive, be unfavorable for peeling off；The stability of coating system can be also influenceed, increases the production cost of coating.And Ludox consumption it is very few when, active force of the nano-particle in coating is weaker, so causes the performance improvement effect of coating unobvious.Therefore consumption of the Ludox in coating must be rationally appropriate.When the present invention is from the ratio, may be such that the tensile strength and elongation at break of coating film is strengthened, while moderate peel strength is also maintained, good acid and alkali-resistance salt performance.
To improve stability of the filler in system, further, the addition of the acrylic acid copolymer sodium salt is the 2 ~ 4% of the talcum powder addition.
Further, the solid content of the ethanol and the mass ratio of the solid content of the alkaline silica sol are 1:1.Adding ethanol can slow down self condensing for silanol in propyl trimethoxy silicane, most of silanol is set to participate in the modified-reaction to alkaline silica sol, but amount of alcohol is excessive and is unfavorable for modified-reaction, thus the mass ratio of silica in ethanol and alkaline silica sol is controlled 1:1.
Further, the addition of the propyl trimethoxy silicane accounts for the 4 ~ 6% of the alkaline silica sol solid content.The consumption of propyl trimethoxy silicane must can just have good modified effect enough.If consumption is not enough, can cause that the silicone hydroxyl of alkaline silica sol particle surface is modified incomplete；If consumption is excessive, unnecessary propyl trimethoxy silicane it may happen that some side reactions and make particle aggregation or crosslinking.
The invention has the advantages that：In the present invention, from aromatic waterborne polyurethane emulsion and Ludox compounding as film forming matter, mechanical strength, strippable property and the tolerance to acid-base salt solution of coating can be improved.From talcum powder as filler, paint coatings can be prevented to be cracked, improve levelability, washability, water resistance of coating etc..The viscosity of dispersion can be improved from the swollen acrylic thickener of alkali soluble, increases the denseness of coating, improve the stability of coating.From silicone emulsion as remover, the base material adhesive force of energy adjusting coating film improves the rippability of film.From acrylate copolymer ammonium salt solution as wetting agent, coating can be enable film cissing phenomenon occur with soaking base material, reduction well.From acrylic acid copolymer sodium salt as dispersant, dispersiveness of the filler in water can be kept.From polyether polyester azo polyether polyeste as levelling agent, it is possible to decrease the interfacial tension between coating and ground, coating is improved to by the wetability of ground.From organic silicon modified by polyether as defoamer, the generation of foam can be reduced, so as to improve the outward appearance of coating film, anti-corrosive properties and weatherability.Effective closing can be carried out to protected object using diaphragm obtained in the present invention to protect, and prevented protected object to be contaminated, corrode and damaged.Meanwhile, the coating also has stability higher, stronger cohesive force, good strippable property and coating strength higher.
Specific embodiment
With reference to embodiment, the present invention is described in further detail, but embodiments of the present invention not limited to this.
Embodiment 1
Modified silicasol and the peelable protective coating of polyurethane latex composite compounding, are obtained by the raw material of following mass fraction：Aromatic waterborne polyurethane emulsion 60 ~ 80%, Ludox 5 ~ 10%, talcum powder 3 ~ 8%, silicone emulsion 1 ~ 3%, acrylate copolymer ammonium salt solution 0.1 ~ 0.5%, alkali soluble is swollen acrylic thickener 0.5 ~ 1%, polyether polyester azo polyether polyeste 0.3 ~ 0.6%, acrylic acid copolymer sodium salt 0.1 ~ 0.5%, organic silicon modified by polyether 0.1 ~ 0.5%, balance of distilled water；The aromatic waterborne polyurethane emulsion is obtained by the raw material of following quality proportioning：40 ~ 80 parts of toluene di-isocyanate(TDI), 40 ~ 80 parts of polypropylene glycol, 3 ~ 10 parts of dihydromethyl propionic acid, 50 ~ 80 parts of butanone, 5 ~ 12 parts of ethylenediamine, 3 ~ 11 parts of triethylamine, 1 ~ 3 part of dibutyl tin laurate, 40 ~ 80 parts of distilled water；The modified silicasol is obtained by the raw material of following quality proportioning：40 ~ 60 parts of alkaline silica sol, 30 ~ 50 parts of ethanol, 1 ~ 6 part of propyl trimethoxy silicane.
Aqueous protective coating is mainly made up of film forming matter, filler, auxiliary agent and solvent.Wherein, film forming matter is the nucleus of protective coating, and the present invention, as film forming matter, can improve stability, strippable property, mechanical strength and the tolerance to acid-base salt solution of coating from aromatic waterborne polyurethane emulsion and Ludox compounding.The following raw material is selected in the preparation of aromatic waterborne polyurethane emulsion：The reaction of isocyanate groups and hydroxyl is carried out from toluene di-isocyanate(TDI) and polypropylene glycol, can so assign coating film excellent mechanical property and barrier propterty.In the reaction, butanone is added to reduce the viscosity of primary product.Relatively it is used alone for dibutyl tin laurate, reaction rate can be significantly improved as catalyst from dibutyl tin laurate and triethylamine compounding, offsets the adverse effect of solvent effect.From ethylenediamine as chain extender, it can carry out chain extension to system, can so improve the tensile strength of coating film.
Stability during to improve alkaline silica sol with aromatic waterborne polyurethane latex composite compounding, the present invention has carried out surface modification treatment to alkaline silica sol.Wherein, from propyl trimethoxy silicane as silane coupler, diaphragm stabilization under room temperature environment can be enable to store 6 ~ 12 months and occur without gelatin phenomenon.The addition of Ludox can make in the nano-silica filled film to coating, and the segment of silica can constitute the network-like structure for mutually running through with the organic high molecular polymer in coating and talcum powder, so, the pliability of organic polymer can be improved, meanwhile, coating film bulk strength and hardness can also be improved.Because the permeability of Ludox is fabulous, it can be penetrated into inside protected base material so that coating film is securely attached on base material.Ludox can also improve the consistency of coating film, can so prevent moisture and other media from invading, and then improve the corrosion resistance of film.
Filler is indispensable part in formulation for coating material, and filling effect is played in coating.From talcum powder as filler, paint coatings can be prevented to be cracked, improve levelability, washability, water resistance of coating etc..Alkali soluble is swollen, and acrylic thickener can improve the viscosity of dispersion, be conducive to dispersion of the talcum powder in system, prevent talcum powder from sinking to luming；The denseness of coating can also be increased simultaneously, the stability of coating is improved.The base material adhesive force of adjusting coating film is capable of in the use of silicone emulsion, film is had preferable peeling effect.Used as wetting agent, it can reduce the surface tension of coating film to acrylate copolymer ammonium salt solution, coating film cissing phenomenon is occurred, is prevented from making application uneven because protected object is unclean with soaking base material, reduction well.Because filler all has hydrophobicity, thus their less stables in water, easily reunite and sink.And pass through to add acrylic acid copolymer sodium salt, then can keep dispersiveness of the filler in water.Polyether polyester azo polyether polyeste is used as levelling agent, it is possible to decrease the interfacial tension between coating and ground, improves the phenomenons such as coating is bad to shrinkage cavity that by the wetability of ground, reduction causes by ground, adhesive force.Coating is required for various artificial and mechanically actuateds in production, storage and work progress, foam is so easily caused to produce, and foam can hinder the dispersion of talcum powder, and film coated surface is caused to form pin hole and shrinkage cavity, so as to influence the outward appearance of coating film, anti-corrosive properties and weatherability.And add the organic silicon modified by polyether can be then effectively improved above mentioned problem.
To ensure isocyanate group-NCO and being smoothed out that the hydroxyl-OH reacts, it is preferable that the mol ratio of the isocyanate group-NCO and hydroxyl-OH is 2.2 ~ 3.6 in the raw material of the aromatic waterborne polyurethane emulsion:1.As-NCO/-OH ＜ 2.2, the viscosity of product can be increased, and be difficult dispersion；And as-NCO/-OH ＞ 3.6, the easy gel of aromatic waterborne polyurethane emulsion reduces storage period.
To reach good neutralization, it is preferable that the addition of the triethylamine and the dihydromethyl propionic acid equimolar amounts.
It is that balance is reached between adhesive force and peel strength, it is preferable that the Ludox is 1 with the mass ratio of the aromatic waterborne polyurethane emulsion:4.The consumption of Ludox directly affects the combination property and production cost of coating.Specifically, when the addition of Ludox is excessive, not only result in film and become fragile, film adhesive is excessive, be unfavorable for peeling off；The stability of coating system can be also influenceed, increases the production cost of coating.And Ludox consumption it is very few when, active force of the nano-particle in coating is weaker, so causes the performance improvement effect of coating unobvious.Therefore consumption of the Ludox in coating must be rationally appropriate.When the present invention is from the ratio, may be such that the tensile strength and elongation at break of coating film is strengthened, while moderate peel strength is also maintained, good acid and alkali-resistance salt performance.
To improve stability of the filler in system, it is preferable that the addition of the acrylic acid copolymer sodium salt is the 2 ~ 4% of the talcum powder addition.
Further, the solid content of the ethanol and the mass ratio of the solid content of the alkaline silica sol are 1:1.Adding ethanol can slow down self condensing for silanol in propyl trimethoxy silicane, most of silanol is set to participate in the modified-reaction to alkaline silica sol, but amount of alcohol is excessive and is unfavorable for modified-reaction, thus the mass ratio of silica in ethanol and alkaline silica sol is controlled 1:1.
Further, the addition of the propyl trimethoxy silicane accounts for the 4 ~ 6% of the alkaline silica sol solid content.The consumption of propyl trimethoxy silicane must can just have good modified effect enough.If consumption is not enough, can cause that the silicone hydroxyl of alkaline silica sol particle surface is modified incomplete；If consumption is excessive, unnecessary propyl trimethoxy silicane it may happen that some side reactions and make particle aggregation or crosslinking.
Above content is to combine the further description that specific preferred embodiment is made to the present invention, it is impossible to assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, the other embodiment drawn in the case where technical scheme is not departed from should be included within the scope of the present invention.
Claims (7)
1. the peelable protective coating of modified silicasol and polyurethane latex composite compounding, it is characterised in that：It is obtained by the raw material of following mass fraction：Aromatic waterborne polyurethane emulsion 60 ~ 80%, Ludox 5 ~ 10%, talcum powder 3 ~ 8%, silicone emulsion 1 ~ 3%, acrylate copolymer ammonium salt solution 0.1 ~ 0.5%, alkali soluble is swollen acrylic thickener 0.5 ~ 1%, polyether polyester azo polyether polyeste 0.3 ~ 0.6%, acrylic acid copolymer sodium salt 0.1 ~ 0.5%, organic silicon modified by polyether 0.1 ~ 0.5%, balance of distilled water；The aromatic waterborne polyurethane emulsion is obtained by the raw material of following quality proportioning：40 ~ 80 parts of toluene di-isocyanate(TDI), 40 ~ 80 parts of polypropylene glycol, 3 ~ 10 parts of dihydromethyl propionic acid, 50 ~ 80 parts of butanone, 5 ~ 12 parts of ethylenediamine, 3 ~ 11 parts of triethylamine, 1 ~ 3 part of dibutyl tin laurate, 40 ~ 80 parts of distilled water；The modified silicasol is obtained by the raw material of following quality proportioning：40 ~ 60 parts of alkaline silica sol, 30 ~ 50 parts of ethanol, 1 ~ 6 part of propyl trimethoxy silicane.
2. the peelable protective coating of modified silicasol according to claim 1 and polyurethane latex composite compounding, it is characterised in that：The mol ratio of the isocyanate group-NCO and hydroxyl-OH is 2.2 ~ 3.6 in the raw material of the aromatic waterborne polyurethane emulsion:1.
3. the peelable protective coating of modified silicasol according to claim 1 and polyurethane latex composite compounding, it is characterised in that：The addition of the triethylamine and the dihydromethyl propionic acid equimolar amounts.
4. the peelable protective coating of modified silicasol according to claim 1 and polyurethane latex composite compounding, it is characterised in that：The Ludox is 1 with the mass ratio of the aromatic waterborne polyurethane emulsion:4.
5. the peelable protective coating of modified silicasol according to claim 1 and polyurethane latex composite compounding, it is characterised in that：The addition of the acrylic acid copolymer sodium salt is the 2 ~ 4% of the talcum powder addition.
6. the peelable protective coating of the modified silicasol according to any one in claim 1 ~ 5 and polyurethane latex composite compounding, it is characterised in that：The solid content of the ethanol is 1 with the mass ratio of the solid content of the alkaline silica sol:1.
7. the peelable protective coating of modified silicasol according to claim 6 and polyurethane latex composite compounding, it is characterised in that：The addition of the propyl trimethoxy silicane accounts for the 4 ~ 6% of the alkaline silica sol solid content.
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| CN201510891910.8A CN106811048A (en) | 2015-11-27 | 2015-11-27 | The peelable protective coating of modified silicasol and polyurethane latex composite compounding |
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| CN201510891910.8A CN106811048A (en) | 2015-11-27 | 2015-11-27 | The peelable protective coating of modified silicasol and polyurethane latex composite compounding |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109486402A (en) * | 2018-11-19 | 2019-03-19 | 山东天庆科技发展有限公司 | Aqueous peelable resin of one kind and preparation method thereof |
| CN111019584A (en) * | 2019-12-19 | 2020-04-17 | 福建拓烯新材料科技有限公司 | Halogen-free peelable blue gel composition and preparation method thereof |
-
2015
- 2015-11-27 CN CN201510891910.8A patent/CN106811048A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109486402A (en) * | 2018-11-19 | 2019-03-19 | 山东天庆科技发展有限公司 | Aqueous peelable resin of one kind and preparation method thereof |
| CN111019584A (en) * | 2019-12-19 | 2020-04-17 | 福建拓烯新材料科技有限公司 | Halogen-free peelable blue gel composition and preparation method thereof |
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