CN106811077A - The preparation method of aqueous peelable protective film composition - Google Patents
The preparation method of aqueous peelable protective film composition Download PDFInfo
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C09D5/20—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for coatings strippable as coherent films, e.g. temporary coatings strippable as coherent films
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Abstract
The invention discloses the preparation method of aqueous peelable protective film composition, including following operation：1）Epoxy resin-butanone solution is obtained；2）At room temperature to IPDI etc. is added in the first reactor, primary product is obtained；3）To dihydromethyl propionic acid is added in primary product, triethylamine is added, epoxide modified aliphatic polyurathane emulsion is obtained；4）At room temperature to Ludox and epoxide modified aliphatic polyurathane emulsion is added in the 3rd reactor, mixed emulsion is obtained, it is standby；5）To appropriate acrylic acid copolymer sodium salt etc. is added in the 4th reactor for filling distilled water, obtain mixing bottom liquid；6）To mixed emulsion is added in mixing bottom liquid, aqueous peelable protective film composition is obtained.There is excellent water resistance, stronger cohesive force, good strippable property and coating strength higher using film composition is protected obtained in the present invention.
Description
Technical field
The present invention relates to decorating field, more particularly, to the preparation method of aqueous peelable protective film composition.
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 preparation method of aqueous peelable protective film composition is provided; protected using protecting film composition that effective closing can be carried out to protected object obtained in the present invention, have the advantages that water resistance is strong, strippable property is good, coating strength is high, cohesive force is strong.
The purpose of the present invention is achieved through the following technical solutions：
The preparation method of aqueous peelable protective film composition, including following operation：
1）To butanone is added in the first reactor for filling epoxy resin, by the rotating speed stirring 10 ~ 30min of mixing of 150 ~ 200r/min, epoxy resin-butanone solution is obtained, it is standby；
2）At room temperature to addition IPDI, polypropylene glycol, polyethylene glycol, dibutyl tin laurate, triethylamine and butanone in the second reactor, temperature is risen to 58 ~ 80 DEG C again, their-NCO% values in hybrid reaction to system in the second reactor are made no longer to change, primary product is obtained, it is standby；
3）By temperature control at 80 DEG C, to operation 2）Dihydromethyl propionic acid is added in the primary product of gained and 220 ~ 260min is reacted；Again to addition operation 1 in the second reactor）Epoxy resin-the butanone solution of gained simultaneously reacts 220 ~ 260min；38 ~ 43 DEG C are cooled the temperature to again, triethylamine is added, and obtain secondary product；To adding secondary product in the 3rd reactor for filling distilled water and secondary product is scattered in distilled water, the diethylenetriamine aqueous solution is added, epoxide modified aliphatic polyurathane emulsion is obtained；
4）At room temperature to addition Ludox and operation 3 in the 4th reactor）The epoxide modified aliphatic polyurathane emulsion of gained, by the rotating speed stirring 50 ~ 70min of mixing of 200 ~ 300r/min, obtains mixed emulsion, standby；
5）To adding the swollen acrylic thickener of appropriate acrylic acid copolymer sodium salt, alkali soluble and organic silicon modified by polyether in the 5th reactor for filling distilled water, by the 4 ~ 10min of rotating speed stirring mixing of 200 ~ 300r/min, again to adding appropriate titanium dioxide, mica in the 5th reactor, by the rotating speed stirring 35 ~ 42min of mixing of 1500 ~ 1800r/min, obtain mixing bottom liquid；
6）To operation 5）Operation 4 is added in the mixing bottom liquid of gained）The mixed emulsion of gained, by the 12 ~ 22min of rotating speed stirring mixing of 350 ~ 500r/min；Add appropriate neopelex, polyether-modified dimethyl siloxane, alkali soluble is swollen acrylic thickener, aqueous silicone oil, organic silicon modified by polyether; by the rotating speed stirring 15 ~ 20min of mixing of 200 ~ 300r/min, aqueous peelable protective film composition is obtained；
The epoxide modified aliphatic polyurathane emulsion is obtained by the raw material of following quality proportioning：40 ~ 80 parts of IPDI, 25 ~ 40 parts of polypropylene glycol, 25 ~ 80 parts of polyethylene glycol, 3 ~ 10 parts of dihydromethyl propionic acid, 5 ~ 12 parts of epoxy resin, 50 ~ 80 parts of butanone, 4 ~ 10 parts of diethylenetriamine, 3 ~ 11 parts of triethylamine, 1 ~ 3 part of dibutyl tin laurate, 40 ~ 80 parts of distilled water；The aqueous peelable protective film composition is obtained by the raw material of following mass fraction：Epoxide modified aliphatic polyurathane emulsion 60 ~ 80%, Ludox 5 ~ 10%, titanium dioxide 2 ~ 5%, mica 3 ~ 5%, aqueous silicone oil 1 ~ 3%, neopelex 0.1 ~ 0.5%, alkali soluble is swollen acrylic thickener 0.5 ~ 1%, polyether-modified dimethyl siloxane 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 present invention first mixes each auxiliary agent during aqueous peelable protective film composition is prepared in distilled water, then to adding color stuffing to form finely dispersed mixing bottom liquid in it, mixed emulsion is well mixed with mixing bottom liquid again finally.This kind of production technology can reduce the resistance of motion of various auxiliary agents, especially wetting agent and dispersant so that they can preferably be adsorbed onto color stuffing surface, and then can greatly improve the decentralization of color stuffing, it is to avoid the problem of particle agglomeration.Aqueous protective coating is mainly made up of film forming matter, color stuffing, auxiliary agent and solvent.Wherein, film forming matter is the nucleus of protective coating, and the present invention, as film forming matter, can improve mechanical strength, strippable property and the tolerance to acid-base salt solution of coating from epoxide modified aliphatic polyurathane emulsion and Ludox compounding.The following raw material is selected in the preparation of epoxide modified aliphatic polyurathane emulsion：The reaction of isocyanate groups and hydroxyl is carried out with polyethylene glycol from IPDI and polypropylene glycol, and polyurethane is modified from epoxy resin, can so improve the water resistance and mechanical property of film forming.Epoxy resin can select E-44.In the reaction, butanone is added to reduce the viscosity of primary product.Because when the temperature of the reaction is higher than 80 DEG C, though the content of-NCO can be rapidly reached theoretical value, now side reaction is more, so easily makes unstable product quality；And when reaction is less than 58 DEG C, production efficiency can be influenceed because reaction speed is relatively slow again.Therefore, by reaction temperature control at 58 ~ 80 DEG C.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 diethylenetriamine as chain extender, it can carry out chain extension to secondary product, can so improve the tensile strength of coating film.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 mica, 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.
Color stuffing is indispensable part in formulation for coating material, and coloring and filling effect are played in coating.Titanium dioxide is the very good Chinese white of covering power, and with good ultraviolet radiation absorption function of shielding.From mica as filler, the performances such as hardness, intensity, wearability and the base material adhesive force of coating film can be improved.Alkali soluble is swollen, and acrylic thickener can improve the viscosity of dispersion, be conducive to dispersion of the mica in system, prevent mica 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 aqueous silicone oil, film is had preferable peeling effect.Used as wetting agent, it can reduce the surface tension of coating film to neopelex, coating film cissing phenomenon is occurred, is prevented from making application uneven because protected object is unclean with soaking base material, reduction well.Because color stuffing 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 color stuffing in water.Polyether-modified dimethyl siloxane 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 mica, 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 2.6 ~ 4 in the raw material of the epoxide modified aliphatic polyurathane emulsion:1.As-NCO/-OH ＜ 2.6, the viscosity of product can be increased, and be difficult dispersion；And as-NCO/-OH ＞ 4, the epoxide modified easy gel of aliphatic polyurathane 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 epoxide modified aliphatic polyurathane 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 color stuffing in system, further, the addition of the acrylic acid copolymer sodium salt is the 2 ~ 4% of the titanium dioxide and mica total amount.
Further, the operation 2）The temperature control of middle hybrid reaction is at 78 ~ 80 DEG C, and the hybrid reaction time is 100 ~ 150min.Because the reactivity of IPDI is relatively low, thus need operation 2）Reaction temperature should be higher than that 75 DEG C, along with the boiling point of butanone is 79.6 DEG C, thus can be by temperature control at 78 ~ 80 DEG C.
Effectively to control operation 2）In reaction-reaction rate of NCO group, further, the operation 2）In also comprise the following steps：During hybrid reaction, every 5 ~ 8min measurements once in first reactor-NCO group accounts for the weight/mass percentage composition of system.
The invention has the advantages that：Effective closing can be carried out to protected object using aqueous peelable protective film composition obtained in the present invention to protect, and prevented protected object to be contaminated, corrode and damaged.Meanwhile, the coating also has excellent water resistance, stronger cohesive force, good strippable property and coating strength higher.Specifically, mechanical strength, strippable property and the tolerance to acid-base salt solution of coating can be improved as film forming matter from epoxide modified aliphatic polyurathane emulsion and Ludox compounding.Reaction rate can be significantly improved as catalyst from dibutyl tin laurate and triethylamine compounding, the adverse effect of solvent effect is offset.From mica as filler, the performances such as hardness, intensity, wearability and the base material adhesive force of coating film can be improved.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 aqueous silicone oil as remover, the base material adhesive force of energy adjusting coating film improves the rippability of film.From neopelex 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 color stuffing in water can be kept.From polyether-modified dimethyl siloxane 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.
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
The preparation method of aqueous peelable protective film composition, including following operation：
1）To butanone is added in the first reactor for filling epoxy resin, by the rotating speed stirring 10 ~ 30min of mixing of 150 ~ 200r/min, epoxy resin-butanone solution is obtained, it is standby；
2）At room temperature to addition IPDI, polypropylene glycol, polyethylene glycol, dibutyl tin laurate, triethylamine and butanone in the second reactor, temperature is risen to 58 ~ 80 DEG C again, their-NCO% values in hybrid reaction to system in the second reactor are made no longer to change, primary product is obtained, it is standby；
3）By temperature control at 80 DEG C, to operation 2）Dihydromethyl propionic acid is added in the primary product of gained and 220 ~ 260min is reacted；Again to addition operation 1 in the second reactor）Epoxy resin-the butanone solution of gained simultaneously reacts 220 ~ 260min；38 ~ 43 DEG C are cooled the temperature to again, triethylamine is added, and obtain secondary product；To adding secondary product in the 3rd reactor for filling distilled water and secondary product is scattered in distilled water, the diethylenetriamine aqueous solution is added, epoxide modified aliphatic polyurathane emulsion is obtained；
4）At room temperature to addition Ludox and operation 3 in the 4th reactor）The epoxide modified aliphatic polyurathane emulsion of gained, by the rotating speed stirring 50 ~ 70min of mixing of 200 ~ 300r/min, obtains mixed emulsion, standby；
5）To adding the swollen acrylic thickener of appropriate acrylic acid copolymer sodium salt, alkali soluble and organic silicon modified by polyether in the 5th reactor for filling distilled water, by the 4 ~ 10min of rotating speed stirring mixing of 200 ~ 300r/min, again to adding appropriate titanium dioxide, mica in the 5th reactor, by the rotating speed stirring 35 ~ 42min of mixing of 1500 ~ 1800r/min, obtain mixing bottom liquid；
6）To operation 5）Operation 4 is added in the mixing bottom liquid of gained）The mixed emulsion of gained, by the 12 ~ 22min of rotating speed stirring mixing of 350 ~ 500r/min；Add appropriate neopelex, polyether-modified dimethyl siloxane, alkali soluble is swollen acrylic thickener, aqueous silicone oil, organic silicon modified by polyether; by the rotating speed stirring 15 ~ 20min of mixing of 200 ~ 300r/min, aqueous peelable protective film composition is obtained；
The epoxide modified aliphatic polyurathane emulsion is obtained by the raw material of following quality proportioning：40 ~ 80 parts of IPDI, 25 ~ 40 parts of polypropylene glycol, 25 ~ 80 parts of polyethylene glycol, 3 ~ 10 parts of dihydromethyl propionic acid, 5 ~ 12 parts of epoxy resin, 50 ~ 80 parts of butanone, 4 ~ 10 parts of diethylenetriamine, 3 ~ 11 parts of triethylamine, 1 ~ 3 part of dibutyl tin laurate, 40 ~ 80 parts of distilled water；The aqueous peelable protective film composition is obtained by the raw material of following mass fraction：Epoxide modified aliphatic polyurathane emulsion 60 ~ 80%, Ludox 5 ~ 10%, titanium dioxide 2 ~ 5%, mica 3 ~ 5%, aqueous silicone oil 1 ~ 3%, neopelex 0.1 ~ 0.5%, alkali soluble is swollen acrylic thickener 0.5 ~ 1%, polyether-modified dimethyl siloxane 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 present invention first mixes each auxiliary agent during aqueous peelable protective film composition is prepared in distilled water, then to adding color stuffing to form finely dispersed mixing bottom liquid in it, mixed emulsion is well mixed with mixing bottom liquid again finally.This kind of production technology can reduce the resistance of motion of various auxiliary agents, especially wetting agent and dispersant so that they can preferably be adsorbed onto color stuffing surface, and then can greatly improve the decentralization of color stuffing, it is to avoid the problem of particle agglomeration.Aqueous protective coating is mainly made up of film forming matter, color stuffing, auxiliary agent and solvent.Wherein, film forming matter is the nucleus of protective coating, and the present invention, as film forming matter, can improve mechanical strength, strippable property and the tolerance to acid-base salt solution of coating from epoxide modified aliphatic polyurathane emulsion and Ludox compounding.The following raw material is selected in the preparation of epoxide modified aliphatic polyurathane emulsion：The reaction of isocyanate groups and hydroxyl is carried out with polyethylene glycol from IPDI and polypropylene glycol, and polyurethane is modified from epoxy resin, can so improve the water resistance and mechanical property of film forming.Epoxy resin can select E-44.In the reaction, butanone is added to reduce the viscosity of primary product.Because when the temperature of the reaction is higher than 80 DEG C, though the content of-NCO can be rapidly reached theoretical value, now side reaction is more, so easily makes unstable product quality；And when reaction is less than 58 DEG C, production efficiency can be influenceed because reaction speed is relatively slow again.Therefore, by reaction temperature control at 58 ~ 80 DEG C.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 diethylenetriamine as chain extender, it can carry out chain extension to secondary product, can so improve the tensile strength of coating film.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 mica, 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.
Color stuffing is indispensable part in formulation for coating material, and coloring and filling effect are played in coating.Titanium dioxide is the very good Chinese white of covering power, and with good ultraviolet radiation absorption function of shielding.From mica as filler, the performances such as hardness, intensity, wearability and the base material adhesive force of coating film can be improved.Alkali soluble is swollen, and acrylic thickener can improve the viscosity of dispersion, be conducive to dispersion of the mica in system, prevent mica 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 aqueous silicone oil, film is had preferable peeling effect.Used as wetting agent, it can reduce the surface tension of coating film to neopelex, coating film cissing phenomenon is occurred, is prevented from making application uneven because protected object is unclean with soaking base material, reduction well.Because color stuffing 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 color stuffing in water.Polyether-modified dimethyl siloxane 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 mica, 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 2.6 ~ 4 in the raw material of the epoxide modified aliphatic polyurathane emulsion:1.As-NCO/-OH ＜ 2.6, the viscosity of product can be increased, and be difficult dispersion；And as-NCO/-OH ＞ 4, the epoxide modified easy gel of aliphatic polyurathane 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 epoxide modified aliphatic polyurathane 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 color stuffing in system, it is preferable that the addition of the acrylic acid copolymer sodium salt is the 2 ~ 4% of the titanium dioxide and mica total amount.
Preferably, the operation 2）The temperature control of middle hybrid reaction is at 78 ~ 80 DEG C, and the hybrid reaction time is 100 ~ 150min.Because the reactivity of IPDI is relatively low, thus need operation 2）Reaction temperature should be higher than that 75 DEG C, along with the boiling point of butanone is 79.6 DEG C, thus can be by temperature control at 78 ~ 80 DEG C.
Effectively to control operation 2）In reaction-reaction rate of NCO group, it is preferable that the operation 2）In also comprise the following steps：During hybrid reaction, every 5 ~ 8min measurements once in first reactor-NCO group accounts for the weight/mass percentage composition of system.
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 preparation method of aqueous peelable protective film composition, it is characterised in that：
Including following operation：
1）To butanone is added in the first reactor for filling epoxy resin, by the rotating speed stirring 10 ~ 30min of mixing of 150 ~ 200r/min, epoxy resin-butanone solution is obtained, it is standby；
2）At room temperature to addition IPDI, polypropylene glycol, polyethylene glycol, dibutyl tin laurate, triethylamine and butanone in the second reactor, temperature is risen to 58 ~ 80 DEG C again, their-NCO% values in hybrid reaction to system in the second reactor are made no longer to change, primary product is obtained, it is standby；
3）By temperature control at 80 DEG C, to operation 2）Dihydromethyl propionic acid is added in the primary product of gained and 220 ~ 260min is reacted；Again to addition operation 1 in the second reactor）Epoxy resin-the butanone solution of gained simultaneously reacts 220 ~ 260min；38 ~ 43 DEG C are cooled the temperature to again, triethylamine is added, and obtain secondary product；To adding secondary product in the 3rd reactor for filling distilled water and secondary product is scattered in distilled water, the diethylenetriamine aqueous solution is added, epoxide modified aliphatic polyurathane emulsion is obtained；
4）At room temperature to addition Ludox and operation 3 in the 4th reactor）The epoxide modified aliphatic polyurathane emulsion of gained, by the rotating speed stirring 50 ~ 70min of mixing of 200 ~ 300r/min, obtains mixed emulsion, standby；
5）To adding the swollen acrylic thickener of appropriate acrylic acid copolymer sodium salt, alkali soluble and organic silicon modified by polyether in the 5th reactor for filling distilled water, by the 4 ~ 10min of rotating speed stirring mixing of 200 ~ 300r/min, again to adding appropriate titanium dioxide, mica in the 5th reactor, by the rotating speed stirring 35 ~ 42min of mixing of 1500 ~ 1800r/min, obtain mixing bottom liquid；
6）To operation 5）Operation 4 is added in the mixing bottom liquid of gained）The mixed emulsion of gained, by the 12 ~ 22min of rotating speed stirring mixing of 350 ~ 500r/min；Add appropriate neopelex, polyether-modified dimethyl siloxane, alkali soluble is swollen acrylic thickener, aqueous silicone oil, organic silicon modified by polyether; by the rotating speed stirring 15 ~ 20min of mixing of 200 ~ 300r/min, aqueous peelable protective film composition is obtained；
The epoxide modified aliphatic polyurathane emulsion is obtained by the raw material of following quality proportioning：40 ~ 80 parts of IPDI, 25 ~ 40 parts of polypropylene glycol, 25 ~ 80 parts of polyethylene glycol, 3 ~ 10 parts of dihydromethyl propionic acid, 5 ~ 12 parts of epoxy resin, 50 ~ 80 parts of butanone, 4 ~ 10 parts of diethylenetriamine, 3 ~ 11 parts of triethylamine, 1 ~ 3 part of dibutyl tin laurate, 40 ~ 80 parts of distilled water；The aqueous peelable protective film composition is obtained by the raw material of following mass fraction：Epoxide modified aliphatic polyurathane emulsion 60 ~ 80%, Ludox 5 ~ 10%, titanium dioxide 2 ~ 5%, mica 3 ~ 5%, aqueous silicone oil 1 ~ 3%, neopelex 0.1 ~ 0.5%, alkali soluble is swollen acrylic thickener 0.5 ~ 1%, polyether-modified dimethyl siloxane 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.
2. the preparation method of aqueous peelable protective film composition according to claim 1, it is characterised in that：The mol ratio of the isocyanate group-NCO and hydroxyl-OH is 2.6 ~ 4 in the raw material of the epoxide modified aliphatic polyurathane emulsion:1.
3. the preparation method of aqueous peelable protective film composition according to claim 1, it is characterised in that：The addition of the triethylamine and the dihydromethyl propionic acid equimolar amounts.
4. the preparation method of aqueous peelable protective film composition according to claim 1, it is characterised in that：The Ludox is 1 with the mass ratio of the epoxide modified aliphatic polyurathane emulsion:4.
5. the preparation method of aqueous peelable protective film composition according to claim 1, it is characterised in that：The addition of the acrylic acid copolymer sodium salt is the 2 ~ 4% of the titanium dioxide and mica total amount.
6. the preparation method of the aqueous peelable protective film composition according to any one in claim 1 ~ 5, it is characterised in that：The operation 2）The temperature control of middle hybrid reaction is at 78 ~ 80 DEG C, and the hybrid reaction time is 100 ~ 150min.
7. the preparation method of aqueous peelable protective film composition according to claim 6, it is characterised in that：The operation 2）In also comprise the following steps：During hybrid reaction, every 5 ~ 8min measurements once in first reactor-NCO group accounts for the weight/mass percentage composition of system.
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Application publication date: 20170609 |