Nuclear-the shell that contains inorganic nano-particle is inorganic-organic composite pressure-sensitive adhesive emulsion and its production and application
Technical field:
The core-shell type that the present invention relates to contain inorganic nano-particle is inorganic-organic composite pressure-sensitive adhesive emulsion, its preparation method and as the application of emulsion-type pressure-sensitive.
Background technology:
The acrylate copolymer emulsion pressure sensitive adhesive from the eighties since China begins development and production, because have good sticking power, resist oxygen aging, do not contain solvent, advantage such as pollution-free, environmental protection, obtained very fast development in recent years, acrylate copolymer emulsion pressure sensitive adhesive and goods thereof have become important industrial raw materials.Acrylate copolymer emulsion to acrylic ester monomer adopt that emulsion polymerization obtains, acrylate copolymer with atomic little uniform particles be dispersed in the stabilising system of aqueous phase, the performance when it is used for pressure sensitive adhesive depends primarily on molecule formation, molecular-weight average and the particulate size etc. of the kind of employed acrylic ester monomer and proportioning, emulsion copolymers.But current coventional type emulsion pressure-sensitive and goods thereof are compared in addition than big gap with the solvent-borne type pressure sensitive adhesive at aspects such as bonding strength, water tolerance, and be coated on different base materials such as BOPP, PE etc. with a kind of acrylate copolymer emulsion, voltage-dependent characteristic often differs greatly, and its study on the modification work all is one of hot subject both domestic and external all the time.
Along with the development of emulsion polymerization technology, adopt the whole bag of tricks that inorganic nano-particle is introduced emulsion polymerization systems, preparing inorganic-organic composite pressure-sensitive adhesive emulsion is one of polymer emulsion modified important channel.Because the complicacy of nano-composite emulsion system, [Zhang Jing, Yang Yukun is with SiO also not see the report of and inorganic-organic nanocomposite composite emulsion that can be practical stable about preparation successfully so far
2Nanoparticle is the methyl methacrylate letex polymerization of seed, and is chemical and bonding, 2001,1,1~3].The method of inorganic nano-particle being introduced polymer emulsion has the direct dispersion method of nanoparticle, emulsion polymerization in situ etc.
The direct dispersion method of nanoparticle is direct, the easiest method of preparation inorganic-organic composite material, be applicable to the nanoparticle of various forms, but because bigger specific surface area and the interfacial free energy of nanoparticle, it is poor in order to the interfacial energy of eliminating between inorganic nano-particle and the polymeric matrix to carry out the organic modification processing or bestow strong physical mechanical work nanoparticle surface; Dispersive method existing paint production plant at present commonly used such as ball mill, sand mill, three-roller, colloidal mill and high speed dispersor etc., but having only seldom usually, the part nanoparticle is in nanometer scale, most of particle is still state of aggregation, is difficult to the real effective dispersion that realizes nanoparticle.
Emulsion polymerization in situ is easy and simple to handle because of it, do not change original polymerization process substantially, enjoyed people's attention as polymer emulsion modified a kind of method.According to the sequencing that inorganic nano-particle generates, emulsion polymerization in situ can be divided into two kinds of situations.A kind of is presoma and the organic monomer copolymerization of introducing inorganic nano-particle in emulsion polymerization process, do not contain nanoparticle in the gained emulsion this moment, when emulsion during in practical application presoma compound by inorganic nano-particle original place and multipolymer that the hydrolysis-condensation reaction generates, organic siloxane modified acrylic emulsion promptly belongs to this situation.This kind situation requires presoma not take place in letex polymerization and storage process afterwards or reacts with very slow speed generation hydrolysis-condensation, design for the pH value of the strict hierarchy of control of hydrolysis-condensation reaction needed that suppresses presoma or to the chemical structure of presoma and the technology of letex polymerization, but this purpose is difficult to reach in actual production and application, in the polymerization process or storage the hydrolysis-condensation reaction of presoma the time takes place and produce gel, thereby can not get corresponding product or product rejection.
Another kind of situation is directly the inorganic nano-particle for preparing to be introduced emulsion polymerization systems, and compound with inorganic nano-particle realized in organic monomer original place in emulsion polymerization process.In the polymerization process, the dissemination of intensive stirring, ultrasonic wave and emulsifying agent can make inorganic nano-particle and reaction monomers all be dispersed into the particle of nanometer size, and because nanoparticle surface is handled through organising or absorption one deck emulsifying agent molecule, can make monomer contain polymerization reaction take place among the monomeric surfactant micelle of inorganic nano-particle and solubilising, when polymericular weight increases to a certain degree, will be coated on inorganic nano-particle and form core-shell type inorganic-organic nanocomposite composite particles on every side; Simultaneously since generally speaking micella (about 4~5nm) and the solubilising micella (about 6~10nm) size all belongs to nano level, so can realize compound on nanoscale of inorganic nano-particle and superpolymer smoothly.Inorganic nano-particle is because special surface, interfacial effect, nanoparticle can be adsorbed onto its surface with the polymkeric substance that monomer polymerization generates by adsorption mechanism, chemical bonding mechanism or electrostatic interaction mechanism, form with the nanoparticle be nuclear, polymkeric substance be the core-shell type of shell inorganic-organic composite pressure-sensitive adhesive emulsion.The research work of domestic relevant this kind situation still is in laboratory stage, and owing to the reason of aspects such as the selection of the employing of the control of nanoparticle surface character, dispersing method, emulsification system and polymerization technique, up to the present also exist nanoparticle effectively not disperse, there is gel to generate in the polymerization process, can not produce or the problem of aspect such as storage stability is bad, thus do not contain on the market core-shell type of inorganic nano-particle inorganic-appearance of organic composite pressure-sensitive adhesive emulsion and related products thereof.
The core-shell type that contains inorganic nano-particle provided by the present invention is inorganic-organic composite pressure-sensitive adhesive emulsion and preparation method thereof, by to the quoting of effective control of nanoparticle surface character, ultra-sonic dispersion technology, the selection of emulsifier system and optimization of polymerization technique etc., realized not only that the real nano level of nanoparticle in emulsion system disperses and compound, polymerization process does not have gel quav and generates, monomer conversion is unaffected, the storage stability of composite emulsion reached more than 1 year, and the performance of each side also is improved when using as pressure sensitive adhesive.
Summary of the invention:
The object of the present invention is to provide a kind of core-shell type that contains inorganic nano-particle inorganic-organic composite pressure-sensitive adhesive emulsion and preparation method thereof, with and as the application of pressure-sensitive adhesive.
The invention provides a kind of core-shell type that contains inorganic nano-particle inorganic-organic composite pressure-sensitive adhesive emulsion, be to adopt emulsion polymerization in situ, promptly the original place realizes making with the compound of inorganic nano-particle in monomeric polymerization processes such as (methyl) vinylformic acid and ester class thereof, and its composition characteristic is:
1. monomer such as (methyl) vinylformic acid and ester class thereof is selected from (methyl) vinylformic acid, (methyl) methyl acrylate, (methyl) ethyl propenoate, (methyl) butyl acrylate, (methyl) glycidyl acrylate, (methyl) Hydroxyethyl acrylate, (methyl) Propylene glycol monoacrylate, (methyl) 2-EHA, acrylamide, N hydroxymethyl acrylamide, vinylbenzene, vinyl acetate, vinyl cyanide, in the two amido ethyl-methyl acrylate 3~6 kinds, preferred vinylformic acid, Hydroxyethyl acrylate, methyl methacrylate, butyl acrylate, weight percentage is 35.0%~60.0%, and wherein the weight percentage of each component is 0.3%~59.1%;
2. inorganic nano-particle is selected from nanometer SiO
2, vapor phase process SiO
2, nano-TiO
2, nanometer Al
2O
3, nano-ZnO or nanometer Ag powder, particle diameter is 7nm~80nm, preferred nanometer SiO
2With vapor phase process SiO
2, weight percentage is 0.2%~15.0%, is preferably 0.5%~10.0%;
3. used emulsifying agent can be selected from nonionic surface active agent in the emulsion polymerization process, comprises octyl phenol polyoxy ethene (10), (11), (12), (13), (30), (40), (70) ether, Nonyl pheno (10), (11), (12), (13), (14), (15), (20), (30), (40), (50) ether; Aniorfic surfactant comprises Sodium dodecylbenzene sulfonate, Witco 1298 Soft Acid ammonium, sodium laurate, ammonium laurate, sodium lauryl sulphate, lauryl polyoxyethylene (2), (3), (7), (12) ether sodium sulfate, lauryl polyoxyethylene (1~4), (5), (12) ether ammonium sulfate, C
12~15Alkyl polyoxyethylene (1~4) ether ammonium sulfate, Nonyl pheno (4) ether sodium sulfate, Nonyl pheno (4) ether ammonium sulfate, sulfo-succinic acid decyl polyoxyethylene (6) ether-ether disodium, sulfo-succinic acid nonyl polyoxyethylene (10) ether-ether disodium, alkyl diphenyl ether disulfonate class, Nonyl pheno (9) ether phosphate sodium; Zwitterionics comprises lauroyl amido CAB, decoyl amido ethyl-N hydroxyethyl amino ethoxy propionic acid disodium, stearyl amido ethyl-N hydroxyethyl Sodium Glycinate; During polymerization in the above-mentioned tensio-active agent of optional usefulness 1~3 kind, preferred Sodium dodecylbenzene sulfonate, polyoxyethylene nonylphenol ether NP-40, lauroyl amido CAB, weight percentage is 0.2%~3.0%, is preferably 0.2%~1.5%;
4. initiator system is selected from tertbutyl peroxide, rongalite, hydrogen peroxide, Sodium Persulfate, Potassium Persulphate or ammonium persulphate, initiator system of ammonium persulfate (APS), and weight percentage is 0.1%~1.5%, is preferably 0.2%~1.0%;
5. used other component in the emulsion polymerization process, pH value conditioning agent is selected from SODIUM PHOSPHATE, MONOBASIC, primary ammonium phosphate, sodium bicarbonate or bicarbonate of ammonia, preferred bicarbonate of ammonia, weight percentage is 0.1%~1%, is preferably 0.1%~0.8%; Chain-transfer agent is an alkyl sulfhydryl, and weight percentage is 0.01~0.03%; The weight percentage of deionized water or distilled water is 30.0%~50.0%; The ammoniacal liquor weight percentage is 0.45~0.85%.
The core-shell type that contains inorganic nano-particle is inorganic-and a kind of preparation method of organic composite pressure-sensitive adhesive emulsion can comprise following step: 1. pre-emulsification: in being dissolved with the aqueous solution of emulsifying agent, add (methyl) vinylformic acid and esters monomer thereof successively, alkyl sulfhydryl obtains pre-emulsion; 2. the preparation of seed emulsion: in another aggregation container, greater than under 3000 rev/mins the violent stirring inorganic nano-particle being joined in the aqueous solution that is dissolved with pH value conditioning agent, partial emulsifier, after the ultrasonic dispersing 5~30 minutes, add 2%~15% of pre-emulsion total amount, 1/3~5/6 of initiator total amount is warmed up to 80~85 ℃ and be incubated 15 minutes then; 3. drip: drip residue pre-emulsion and initiator, dripped off in 3~4 hours, be incubated 1 hour, temperature should not be higher than 85 ℃ in the dropping process; 4. aftertreatment: add tertbutyl peroxide and rongalite and also be incubated 30 minutes, be cooled to that the pH value with the ammoniacal liquor regulation system is 7~8 about 60 ℃, cool to 40 ℃ of left and right sides blowings again.
The core-shell type that contains inorganic nano-particle is inorganic-and the another kind of preparation method of organic composite pressure-sensitive adhesive emulsion can comprise following step: and 1. pre-emulsification: adding inorganic nano-particle and ultrasonic dispersing are 5~10 minutes in the mixture of (methyl) vinylformic acid and esters monomer and alkyl sulfhydryl, join then in the aqueous solution that is dissolved with emulsifying agent and obtain pre-emulsion; 2. the preparation of seed emulsion: in another aggregation container, add 2%~15% of pre-emulsion total amount in the aqueous solution that is dissolved with pH value conditioning agent, partial emulsifier, 1/3~5/6 of initiator total amount is warmed up to 80~85 ℃ and be incubated 15 minutes then; 3. drip: drip residue pre-emulsion and initiator, dripped off in 3~4 hours, be incubated 1 hour, temperature should not be higher than 85 ℃ in the dropping process; 4. aftertreatment: add tertbutyl peroxide and rongalite and also be incubated 30 minutes, be cooled to that the pH value with the ammoniacal liquor regulation system is 7~8 about 60 ℃, cool to 40 ℃ of left and right sides blowings again.
The core-shell type that contains inorganic nano-particle is inorganic-organic composite pressure-sensitive adhesive emulsion and preparation method thereof in used inorganic nano-particle, its surface organic is handled used treatment agent can be selected from silane coupling agent, comprises octamethylcyclotetrasiloxane, dichlorodimethylsilane, γ-(methacryloxypropyl) Trimethoxy silane (KH-570), vinyltriethoxysilane, N-(beta-amido ethyl)-γ-aminocarbonyl propyl Trimethoxy silane, γ-An Jibingjisanyiyangjiguiwan; Also optional titanate coupling agent, aluminate coupling agent; And the tensio-active agent of various ionic types, comprise octyl phenol polyoxy ethene (13), (30), (40), ether, Nonyl pheno (13), (14), (15), (20), (30), (40), (50) ether, Sodium dodecylbenzene sulfonate, Witco 1298 Soft Acid ammonium, sodium lauryl sulphate, lauryl polyoxyethylene (2), (3), (7), (12) ether sodium sulfate, lauryl polyoxyethylene (1~4), (5), (12) ether ammonium sulfate, C
12~15Alkyl polyoxyethylene (1~4) ether ammonium sulfate, Nonyl pheno (4) ether sodium sulfate, Nonyl pheno (4) ether ammonium sulfate, sulfo-succinic acid decyl polyoxyethylene (6) ether-ether disodium, sulfo-succinic acid nonyl polyoxyethylene (10) ether-ether disodium, the alkyl diphenyl ether disulfonate class, Nonyl pheno (9) ether phosphate sodium, lauroyl amido CAB, decoyl amido ethyl n-hydroxyethylamino ethoxy-c acid disodium, stearyl amido ethyl n-hydroxyethylamino sodium acetate.The consumption that surface organic is handled used treatment agent is 0.3%~1.2% of an inorganic nano-particle weight.
The core-shell type that contains inorganic nano-particle is inorganic-and organic composite pressure-sensitive adhesive emulsion is as the application of pressure-sensitive adhesive.Performance testing method of pressure-sensitive: tack is pressed GB-4852-84 and is measured; Holding viscosity measures by GB-4851-84; 180 ° of stripping strengths are pressed GB-2792-81 and are measured.
The present invention adopts emulsion polymerization in situ that inorganic nano-particle is introduced emulsion polymerization systems, and compound with inorganic nano-particle realized in organic monomer original place in emulsion polymerization process.In the polymerization process, the dissemination of intensive stirring, ultrasonic wave and emulsifying agent can make inorganic nano-particle and reaction monomers all be dispersed into the particle of nanometer size, realize smoothly inorganic nano-particle effective dispersion and with superpolymer compound on nanoscale.Inorganic nano-particle can be adsorbed onto its surface with the polymkeric substance that monomer polymerization generates by adsorption mechanism, chemical bonding mechanism or electrostatic interaction mechanism, form with the nanoparticle be nuclear, polymkeric substance be the core-shell type of shell inorganic-organic composite pressure-sensitive adhesive emulsion.Inorganic-organic composite pressure-sensitive adhesive emulsion that present method is prepared, polymerization technique is simple and practical, and the polymerization process gel-free generates, monomer conversion is unaffected, the emulsion storage stability can reach more than 1 year, when being applied to Pressuresensitive Tape, can be applicable to base material BOPP and PE simultaneously.Compare with the emulsion that does not contain nanoparticle, the composite pressure-sensitive adhesive emulsion that contains nanoparticle all is improved at aspects such as voltage-dependent characteristic and water tolerance, and is the most remarkable when wherein being base material with PE.
Description of drawings:
Change of size in Fig. 1 embodiment 1 inorganic-organic composite pressure-sensitive adhesive emulsion polymerization process
Change of size in Fig. 2 pure-acrylic emulsion polymerization process
Specific embodiment:
The following examples can make those skilled in the art more fully understand the present invention, but do not limit the present invention in any way.
Embodiment 1
A. fill a prescription (by weight percentage)
Component | Consumption | Component | Consumption |
The acrylic acid acrylic acid third hydroxyl ethyl ester methyl methacrylate butyl acrylate lauryl mercaptan ammonium persulfate carbonic hydroammonium | 0.53 1.07 3.18 48.18 0.015 0.26 0.17 | Sodium dodecylbenzene sulfonate emulsifying agent NP-40 nanometer SiO
2Tertbutyl peroxide rongalite ammoniacal liquor deionized water
| 0.32 0.21 0.30 0.08 1.05 0.50 44.14 |
B. preparation method
1) pre-emulsification: in the aqueous solution that is dissolved with emulsifying agent Sodium dodecylbenzene sulfonate, NP-40 total amount 60%, add monomer and alkyl sulfhydryls such as vinylformic acid, Hydroxyethyl acrylate, methyl methacrylate, butyl acrylate successively, obtain pre-emulsion with speed stirring greater than 100 rev/mins;
2) preparation of seed emulsion: in the polymeric kettle, greater than under 3000 rev/mins the violent stirring with nanometer SiO
2Particle joins in the aqueous solution that is dissolved with bicarbonate of ammonia, emulsifying agent Sodium dodecylbenzene sulfonate and NP-40 total amount 40%, after the ultrasonic dispersing 25 minutes, add 8.0% of pre-emulsion total amount, 1/6 of initiator total amount is warmed up to 80~85 ℃ and be incubated 15 minutes then;
3) drip: drip residue pre-emulsion and initiator, dripped off in 3~4 hours, be incubated 1 hour, temperature should not be higher than 85 ℃ in the dropping process;
4) aftertreatment: add tertbutyl peroxide and rongalite and also be incubated 30 minutes, be cooled to that the pH value with the ammoniacal liquor regulation system is 7~8 about 60 ℃, cool to 40 ℃ of left and right sides blowings again.
C. emulsion property
Wherein B40702 is inorganic-organic composite pressure-sensitive adhesive emulsion, and A40705 is not for containing nanometer SiO
2The pure-acrylic emulsion of particle
1. emulsion physical property measurement
Project | B40702 | A40705 |
Solid content (%) pH value viscosity, the mPa.s median size, nm | 54.32 7.5 100 330.5 | 51.6 7.5 60 351.1 |
2. (gluing thickness is 19~21um to the test of emulsion voltage-dependent characteristic.)
Emulsion | Base material | Just sticking (ball number) | Hold sticking (h) | Peel off (N/25mm) for 180 ° |
B40702 | BOPP PE | 23 22 | 86.9 90.5 | 10.83 10.31 |
A40705 | BOPP PE | 24 16 | 120 58.7 | 8.06 5.26 |
Embodiment 2
A. fill a prescription (by weight percentage)
It is identical with embodiment 1 to fill a prescription
B. preparation method
1) pre-emulsification: in the mixture of monomer such as vinylformic acid, Hydroxyethyl acrylate, methyl methacrylate, butyl acrylate and alkyl sulfhydryl, add nanometer SiO
2Particle and ultrasonic dispersing 5 minutes join mixture in the aqueous solution that is dissolved with emulsifying agent Sodium dodecylbenzene sulfonate, NP-40 total amount 80% then, obtain pre-emulsion with the speed stirring greater than 500 rev/mins;
2) preparation of seed emulsion: in the polymeric kettle, in the aqueous solution that is dissolved with bicarbonate of ammonia, emulsifying agent Sodium dodecylbenzene sulfonate and NP-40 total amount 20%, add 8.0% of pre-emulsion total amount, 1/3 of initiator total amount is warmed up to 80~85 ℃ and be incubated 15 minutes then;
3) drip: drip residue pre-emulsion and initiator, dripped off in 3~4 hours, be incubated 1 hour, temperature should not be higher than 85 ℃ in the dropping process;
4) aftertreatment: add tertbutyl peroxide and rongalite and also be incubated 30 minutes, be cooled to that the pH value with the ammoniacal liquor regulation system is 7~8 about 60 ℃, cool to 40 ℃ of left and right sides blowings again.
C. emulsion physical property measurement
Project | Index |
Solid content (%) pH value viscosity, the mPa.s median size, nm | 54.18 7.5 55 312.5 |
Embodiment 3
A. fill a prescription (by weight percentage)
With vapor phase process SiO
2Nanometer SiO in equivalent substitution embodiment 1 prescription
2, all the other components and consumption are identical with embodiment 1.
B. preparation method
The preparation method is identical with embodiment 1, just with vapor phase process SiO
2Nanometer SiO in equivalent substitution embodiment 1 working method
2
C. emulsion physical property measurement
Project | Index |
Solid content (%) pH value viscosity, the mPa.s median size, nm | 53.75 7.5 90 222.6 |
Embodiment 4
A. fill a prescription (by weight percentage)
With vapor phase process SiO
2Nanometer SiO in equivalent substitution embodiment 1 prescription
2, all the other components and consumption are identical with embodiment 1.
B. preparation method
The preparation method is identical with embodiment 2, just with vapor phase process SiO
2Nanometer SiO in equivalent substitution embodiment 2 working method
2
C. emulsion physical property measurement
Project | Index |
Solid content (%) pH value viscosity, the mPa.s median size, nm | 50.71 7.5 65 304.7 |