Enhanced water resistance emulsion-type polyacrylate pressure-sensitive adhesive and method for making thereof and application
Technical field
The present invention relates to the emulsion-type polyacrylate pressure-sensitive adhesive, the pressure-sensitive acrylate band of using this tackiness agent to make, and the preparation method of this tackiness agent and adhesive tape.
Background technology
Along with industrial development, technical progress, the pressure sensitive adhesive quality improves constantly, and use range is also more and more extensive.In the past, most pressure sensitive adhesives were the solvent-borne type pressure sensitive adhesive, consider from environment protection, factor such as economize on resources, and Water-borne modification gradually in recent years, wherein the emulsion-type polyacrylate pressure-sensitive has become one of important directions of this field development.According to statistics, in all kinds of pressure sensitive adhesives that China produces, it is about 65% that the emulsion-type polyacrylate pressure-sensitive accounts for, and has been widely used in every profession and trades such as Pressuresensitive Label, gummed tape, coating, building, weaving and medical material.The emulsion-type polyacrylate pressure-sensitive has the performance of following excellence: 1. be solvent with water, not with an organic solvent, and toxicological harmless, pollution-free, belong to environmentfriendly products; 2. acrylic monomer contains ester group, carboxyl, hydroxyl ability group more, is easy to carry out copolymerization with other hard monomer and function monomer, process the emulsion adhesive with various performances, and preparation cost is low, is convenient to use; 3. relative molecular mass is higher, and stability to aging, pressure-sensitive and adhesiveproperties are good.
But when contacting with water, most polyacrylate pressure-sensitive can bleach; This is because generally: the materials such as polymkeric substance that hydrophilic emulsifying agent, ionic initiator and ionic comonomer polymerization produce in the emulsion system are closed in the glued membrane; These materials tend to cause water molecules to pass through the latex particle interfacial diffusion and in the space of dry glued membrane, form water pocket; Force latex particle separately, thereby cause water-white or blooming.Therefore, the emulsion-type polyacrylate pressure-sensitive of studying a kind of enhanced water resistance has great significance.
Summary of the invention
The object of the present invention is to provide the good emulsion-type polyacrylate pressure-sensitive adhesive of a kind of water resistance.
The present invention also aims to use this tackiness agent to prepare the Pressuresensitive Tape of enhanced water resistance ability and good adhesiveproperties.
For realizing above-mentioned purpose, technical scheme of the present invention is following:
The present invention provides a kind of emulsion-type polyacrylate pressure-sensitive adhesive of enhanced water resistance, and by weight percentage, this tackiness agent is mixed by component (A) and component (B):
Component (A) is that polyacrylic ester is the emulsion 92-97% of staple
Component (B) is water-soluble monomer and radical initiator 3-8%
The weight percent of component (A) and component (B) adds up to 100%.
The prescription of the component of emulsion-type polyacrylate pressure-sensitive adhesive of the present invention (A) comprises by the per-cent that accounts for component (A) gross weight:
Component (A) forms through letex polymerization by above prescription.
Described soft monomer is one or more in Bing Xisuandingzhi, Isooctyl acrylate monomer, ethyl propenoate, the ethyl acrylate.Described hard monomer is one or more in TEB 3K, vinylbenzene, vinyl cyanide, the vinyl acetate.Described function monomer is one or more of vinylformic acid, methylacrylic acid, methylene-succinic acid, toxilic acid, fumaric acid, N hydroxymethyl acrylamide, Hydroxyethyl acrylate, Propylene glycol monoacrylate, glycidyl acrylate.Described emulsifying agent be sodium laurylsulfonate and polyoxyethylene nonylphenol by weight 1: 2-2: 1 composite forming.Described initiator is one or more in Potassium Persulphate, ammonium persulphate, the hydrogen peroxide.Described chain-transfer agent is a lauryl mercaptan.Described pH regulator agent is an ammoniacal liquor.
The component of emulsion-type polyacrylate pressure-sensitive adhesive of the present invention (B) is mixed by water-soluble monomer and initiator.Per-cent by accounting for component (B) gross weight comprises:
Contain amido or cationic water-soluble monomer 98.5-99.9%
Low temperature radical initiator 0.1-1.5%
Above-mentioned low temperature refers to that the temperature of reaction of radical initiator is 30-50 ℃.
Described water-soluble monomer is selected from N-vinyl pyrrolidone (NVP), vinyl pyridine (VP), octadecyl dimethyl-allyl ammonium chloride (C
18DMAAC), in the dimethyl diallyl ammonium chloride (DMDAAC), diethylammonium diallyl ammonium chloride (DEDAAC), acrylyl oxy-ethyl-trimethyl salmiac (DAC), methyl-acrylyl oxy-ethyl-trimethyl salmiac (DMC), dimethylaminoethyl methacrylate (DMAM) one or more, preferred weight percent is 98.8-99.2%.Described initiator is selected from Ammonium Persulfate 98.5/sodium sulfite anhy 96, Potassium Persulphate/sodium sulfite anhy 96, Potassium Persulphate/Sulfothiorine, azo diisobutyl amidine hydrochloride (AIBA), BPO (BPO)/N; Among the N '-xylidine (DMA) one or more; Preferred weight percent is 0.8-1.2%, and the preferable reaction temperature of initiator is 35-45 ℃.
The preparation method of emulsion-type polyacrylate pressure-sensitive adhesive provided by the invention comprises following process step:
(1) in the prescription ratio by component (A), the 40-45% of water gross weight, the 30-35% of emulsifying agent gross weight, the 35-40% of initiator gross weight, whole soft monomer, hard monomer and function monomer emulsification 15-20min in preparatory emulsor are got pre-emulsion.Remainder water, emulsifying agent, initiator, chain-transfer agent are added in the polymerization reactor, stir when being warming up to 78-80 ℃, add the 15-20% of pre-emulsion weight; Behind the reaction 30-40min, drip the residue pre-emulsion, controlling reaction time 2.5-3h; Behind the insulation 1h; Cooling discharge is regulated the pH value to 7-8 with ammoniacal liquor, promptly gets component (A).
(2) under the room temperature, component (B) is slowly added in the component (A), after mixing, make aqueous emulsion polyacrylate pressure-sensitive adhesive.The component of using (A) is respectively 3-8% and 92-97% with the weight percent of component (B), and the two weight percent adds up to 100%.
Emulsion-type polyacrylate pressure-sensitive adhesive provided by the invention can be used for preparing the high-performance pressure-sensitive adhesive tape, and the preparation method is following:
The emulsion-type polyacrylate pressure-sensitive adhesive is taked the principle of now-making-now-using.The pressure-sensitive adhesive that at present prepares is coated on carrier surface forms adhesive coating, coat-thickness 25-50 μ m is under 30-50 ℃ in temperature of reaction, and this adhesive coating of thermopolymerization 30-40min makes Pressuresensitive Tape after the oven dry.
The invention has the beneficial effects as follows: (1) emulsion-type polyacrylate pressure-sensitive adhesive comprises component (A) and a spot of component (B); After component (B) slowly is dissolved in component (A); Because there is the physical attraction effect of intensive positive and negative charge in the two; Positively charged ion in the component (B) or the monomer that has an amido will be adsorbed in the surface of the polyacrylic ester emulsion particle in the component (A), and when system temperature rose to 35-45 ℃, the monomer in the component (B) was in interfacial phase generation thermopolymerization; It is the cross-linked network skeleton that system finally forms with the polyacrylic ester emulsion particle, carries the inierpeneirating network structure of the polymer molecular chain of amido or cation group through the emulsion particle interface.This network structure distance between the emulsion particle that will further is greatly dwindled the space between emulsion particle, thereby hinders the entering of water molecules, reaches the force of cohesion and the water-proof purpose that improve glued membrane.
(2) each item of the Pressuresensitive Tape that is prepared into this emulsion adhesive is functional, and preparation technology is simple, and is pollution-free, with low cost, is fit to large-scale industrial production.
Embodiment
The embodiment that below enumerates carries out bright specifically to the present invention, but the present invention is not limited in these examples.Percentage ratio in following examples (remove and particularly point out) all is weight percentage.
Embodiment 1
According to the prescription of table one, component (A) is formed by letex polymerization.According to the prescription of table two, component (B) is to be mixed under room temperature by water-soluble monomer and low temperature radical initiator to form.According to the prescription of table three, component (B) slowly added in the component (A) under room temperature, mix, promptly make the emulsion-type polyacrylate pressure-sensitive adhesive.This tackiness agent now-making-now-using, performance are best.
With RK line rod spreader pressure sensitive adhesive is coated on the PET film, bondline thickness is about 35 μ m, is warming up to the monomer 30min in 45 ℃ of polymeric components (B), and oven dry back bondline thickness is about 25 μ m, sticks the organosilicon protection sheet and promptly gets Pressuresensitive Tape.Pressuresensitive Tape is cut into wide 25mm, and the batten of long 200mm supplies to survey and uses.By make the PET adhesive tape that forms by the coating of component (A) emulsion merely with quadrat method, relatively use as water-proof.
Embodiment 2
According to the prescription of table one, component (A) is formed by letex polymerization.According to the prescription of table two, component (B) is to be mixed under room temperature by water-soluble monomer and low temperature radical initiator to form.According to the prescription of table three, component (B) slowly added in the component (A) under room temperature, mix, promptly make the emulsion-type polyacrylate pressure-sensitive adhesive.This tackiness agent now-making-now-using, performance are best.
With RK line rod spreader pressure sensitive adhesive is coated on the PET film, bondline thickness is about 40 μ m, is warming up to the monomer 30min in 30 ℃ of polymeric components (B), and oven dry back bondline thickness is about 25 μ m, sticks the organosilicon protection sheet and promptly gets Pressuresensitive Tape.Pressuresensitive Tape is cut into wide 25mm, and the batten of long 200mm supplies to survey and uses.By make the PET adhesive tape that forms by the coating of component (A) emulsion merely with quadrat method, relatively use as water-proof.
Embodiment 3
According to the prescription of table one, component (A) is formed by letex polymerization.According to the prescription of table two, component (B) is to be mixed under room temperature by water-soluble monomer and low temperature radical initiator to form.According to the prescription of table three, component (B) slowly added in the component (A) under room temperature, mix, promptly make the emulsion-type polyacrylate pressure-sensitive adhesive.This tackiness agent now-making-now-using, performance are best.
With RK line rod spreader pressure sensitive adhesive is coated on the BOPP film, bondline thickness is about 35 μ m, is warming up to the monomer 30min in 40 ℃ of polymeric components (B), and oven dry back bondline thickness is about 25 μ m, sticks the organosilicon protection sheet and promptly gets Pressuresensitive Tape.Pressuresensitive Tape is cut into wide 25mm, and the batten of long 200mm supplies to survey and uses.By make the BOPP adhesive tape that forms by the coating of component (A) emulsion merely with quadrat method, relatively use as water-proof.
Embodiment 4
According to the prescription of table one, component (A) is formed by letex polymerization.According to the prescription of table two, component (B) is to be mixed under room temperature by water-soluble monomer and low temperature radical initiator to form.According to the prescription of table three, component (B) slowly added in the component (A) under room temperature, mix, promptly make the emulsion-type polyacrylate pressure-sensitive adhesive.This tackiness agent now-making-now-using, performance are best.
With RK line rod spreader pressure sensitive adhesive is coated on the BOPP film, bondline thickness is about 40 μ m, is warming up to the monomer 30min in 40 ℃ of polymeric components (B), and oven dry back bondline thickness is about 30 μ m, sticks the organosilicon protection sheet and promptly gets Pressuresensitive Tape.Pressuresensitive Tape is cut into wide 25mm, and the batten of long 200mm supplies test to use.By make the BOPP adhesive tape that forms by the coating of component (A) emulsion merely with quadrat method, relatively use as water-proof.
Embodiment 5
According to the prescription of table one, component (A) is formed by letex polymerization.According to the prescription of table two, component (B) is to be mixed under room temperature by water-soluble monomer and low temperature radical initiator to form.According to the prescription of table three, component (B) slowly added in the component (A) under room temperature, mix, promptly make the emulsion-type polyacrylate pressure-sensitive adhesive.This tackiness agent now-making-now-using, performance are best.
With RK line rod spreader pressure sensitive adhesive is coated on the ldpe film, bondline thickness is about about 40 μ m, is warming up to the monomer 30min in 50 ℃ of polymeric components (B), and oven dry back bondline thickness is about 25 μ m, sticks the organosilicon protection sheet and promptly gets Pressuresensitive Tape.Pressuresensitive Tape is cut into wide 25mm, and the batten of long 200mm supplies to survey and uses.By make the LDPE adhesive tape that forms by the coating of component (A) emulsion merely with quadrat method, relatively use as water-proof.
Table four is the component (A) that makes among the embodiment 1-5 and the various performance parameters of emulsion-type pressure-sensitive adhesive.Can know that by the come off data comparison of time, water-absorbent and solubility rate of glued membrane in the table four pressure-sensitive adhesive provided by the invention and Pressuresensitive Tape have excellent in water resistance.
(1) viscosity: with the test of NDJ-1 type rotational viscosimeter, 25 ℃, 3
#Rotor, 60rmin
-1
(2) solid content: take by weighing sample 1.0-1.5g in the weighing bottle of having weighed, be dried to constant weight, ask solid content.
(3) particle diameter: test with Marvlen Zetasizaer 3000HS particle diameter appearance.
(4) transformation efficiency: take by weighing sample 1.0-2.0g in the weighing bottle of having weighed, add a small amount of Resorcinol, be dried to constant weight, ask transformation efficiency.
(5) glued membrane comes off the time: the film batten that will scribble component (A) emulsion and scribble pressure-sensitive adhesive is respectively at being immersed under the room temperature in the tap water, and relatively glued membrane comes off the time.
(6) water-absorbent and solubility rate: will scribble component (A) emulsion and place copper wire gauze (mass M respectively with the film batten that scribbles pressure-sensitive adhesive
0) on, the title gross weight is M
1In the room temperature tap water, soaked 4 days, blot surface-moisture, be weighed as M with filter paper
2,, be weighed as M with the film oven dry
3Be calculated as follows:
Water-absorbent=(M
2-M
1)/(M
1-M
0) * 100%
Solubility rate=(M
1-M
3)/(M
1-M
0) * 100%
(7) pressure sensitive adhesive over-all properties: tack is pressed GB 4852-84 test with CZY-G initial bonding strength tester; Hold viscosity and hold the viscous force tester, press GB 4851-98 test with CZY-6S; Stripping strength is pressed GB 2792-98 test with BLD-200S electronic glass experimental machine.
The prescription of component in table one pressure-sensitive adhesive (A)
Annotate: 1-5=embodiment 1-5; The a=Bing Xisuandingzhi; The b=Isooctyl acrylate monomer; The c=ethyl propenoate; The d=ethyl acrylate; The e=TEB 3K; F=vinylbenzene; The g=vinyl acetate; The h=methylacrylic acid; I=vinylformic acid; The j=N-NMA; The k=Hydroxyethyl acrylate; (the two weight ratio is 1: 1 to l=sodium laurylsulfonate/polyoxyethylene nonylphenol among the embodiment 1 and 2; The two weight ratio is 1: 2 among the embodiment 3; The two weight ratio is 2: 1 among the embodiment 4 and 5); The m=ammonium persulphate; The n=hydrogen peroxide; The o=lauryl mercaptan; The nitrogenous element quality of p=is 15% ammoniacal liquor; Q=water.
The prescription of component in table two pressure-sensitive adhesive (B)
Annotate: a=N-vinyl pyrrolidone, b=vinyl pyridine, c=dimethyl diallyl ammonium chloride, d=acrylyl oxy-ethyl-trimethyl salmiac, e=dimethylaminoethyl methacrylate, f=Potassium Persulphate/sodium sulfite anhy 96, g=Potassium Persulphate/Sulfothiorine, h=azo diisobutyl amidine hydrochloride, i=BPO (BPO)/N, N '-xylidine (DMA)
The prescription of table three emulsion-type polyacrylic ester tackiness agent
Component (A) among the table four embodiment 1-5 and each item performance of pressure-sensitive adhesive and water tolerance are relatively