Summary of the invention:
The preparation method who the purpose of this invention is to provide a kind of acrylic acid emulsion adhesive for rubber, prepare the method for the nucleocapsid structure acrylic acid emulsion adhesive of adhesiveproperties excellence by adding the modification acrylate monomer, can be widely used in the bonding of material such as rubber.
The preparation of a kind of acrylic acid emulsion adhesive for rubber of the present invention is to have added the monomers such as tetrahydrofuran (THF) acrylate that contain polar group to carry out modification in the shell component, has well improved the adhesiveproperties of acrylic acid emulsion adhesive to adhesives; In addition, the emulsion of preparation has nuclear-shell bilayer structure, and guarantees that the second-order transition temperature of emulsion shell will be far below the second-order transition temperature of nuclear, makes the performances such as sticking power of under force of cohesion and the condition that is not affected set time raising emulsion.
Particularly, preparation method of the present invention comprises the steps:
(1) earlier the partial monosomy in the nuclear consitution, part deionized water, partial emulsifier are carried out pre-emulsification and obtain pre-emulsion;
(2) pre-emulsion is moved in the reactor, under 100-150 rev/mins the rotating speed, be warming up to 70-80 ℃, add the part initiator in the nuclear consitution, reaction obtains seed emulsion;
(3) residual monomer of nuclear consitution is added dropwise to slowly in the seed emulsion that step (2) obtains, adds residual emulsifier, deionized water and the initiator of nuclear consitution in the reaction process, reaction obtains the nuclear part of emulsion;
(4) monomer of shell component slowly is added dropwise in the nuclear part of emulsion of step (3) preparation again, adds emulsifying agent, deionized water, the initiator of shell component in the reaction process, reaction finishes, and transfers pH value to 7-8 promptly to obtain acrylic acid emulsion adhesive for rubber;
Wherein the composition and the parts by weight thereof of nuclear consitution and shell component are as follows:
Shell component: Butyl Acrylate Monomer 30-50 Hydroxyethyl acrylate monomers 0.5-2.5 methacrylic acid monomers 1-5
Styrene monomer 5-15 methyl methacrylate lists 10-20 modified monomers 3-10
Body
Initiator 0.1-0.4 emulsifying agent 0.3-3.5
Nuclear consitution: Butyl Acrylate Monomer 25-45 methyl methacrylate lists 10-30 styrene monomers 5-15
Body
Methacrylic acid monomer 1-3 Hydroxyethyl acrylate monomers 0.5-2.0 sodium bicarbonates 0.1-0.25
Emulsifying agent 0.3-3.5 initiators 0.1-0.4
Preferred version is as follows:
Shell component: Butyl Acrylate Monomer 30-50 Hydroxyethyl acrylate monomers 0.5-2.5 methacrylic acid monomers 1-5
Styrene monomer 5-15 methyl methacrylate monomers 10-20 modified monomers 3-10
Ammonium persulfate 0.1-0.4 Sodium dodecylbenzene sulfonate 0.5-2.0 OP-10 0.25-15
Nuclear consitution: Butyl Acrylate Monomer 25-45 methyl methacrylate monomers 10-30 styrene monomers 5-15
Methacrylic acid monomer 1-3 Hydroxyethyl acrylate monomers 0.5-2.0 sodium bicarbonates 0.1-0.25
OP-10 0.25-1.5 Sodium dodecylbenzene sulfonate 0.5-2.0 ammonium persulfates 0.1-0.4
The summation of said components consumption is 100.
Described initiator preferred anionic initiator potassium persulfate and/or ammonium persulfate, triggering mechanism are that free radical causes.
The compound emulsifying agent of described emulsifying agent preferred anionic emulsifying agent and nonionic emulsifier.
In the preferred Sodium dodecylbenzene sulfonate of anionic emulsifier, sodium laurylsulfonate, the sodium lauryl sulphate one or more;
Nonionic emulsifying agent comprises OP-10 and/or XP-10 etc.
The main foundation that emulsifying agent is selected is the HLB value of polymerization single polymerization monomer group, and the HLB value of emulsifying agent and the HLB value of monomeric groups are good more near its emulsive effect more.According to mentioned above principle, the present invention explores by creativeness and draws the compound emulsifying agent of Sodium dodecylbenzene sulfonate and OP-10 emulsifying effectiveness the best to Acrylic Acid Monomer, and the ratio of selecting for use is 1:2-1:1, and its consumption is 1.0-3.0% of an emulsion weight.
Monomer of the present invention mainly comprises hard monomer, soft monomer, functional monomer and modified monomer.
Hard monomer comprises: the monomer that second-order transition temperatures such as methyl methacrylate, vinylbenzene are higher, the increase of hard monomer amount can improve force of cohesion, bonding strength and the set time etc. of emulsion glue;
Soft monomer comprises the lower monomers of second-order transition temperature such as butyl acrylate, Isooctyl acrylate monomer, the raising of its add-on can increase the initial bonding strength of emulsion glue and hold viscous force, but the higher problems such as the reduction of emulsion glue force of cohesion, prolongation time of drying that occur easily of soft monomer amount;
Functional monomer comprises vinylformic acid, Hydroxyethyl acrylate etc., it mainly acts on is that groups such as hydroxyl by on the functional monomer are coupled to each other the acrylate copolymer chain, the cohesive strength of ACRYLIC EMULSION is greatly improved, simultaneously because the mutual connection of polymer chain also causes problems such as emulsion viscosity increase easily;
Modified monomer mainly comprises the fluorine-containing and/or the tetrahydrofuran (THF) acrylate of polar functionalities, the polar group that adds all has certain corrosive nature to the surface of a lot of base materials, thereby makes the latex ion can well infiltrate the sticking power that substrate surface has improved acrylic acid emulsion adhesive greatly.Experimental result of the present invention shows that the effect of the emulsion adhesive that the stronger tetrahydrofuran (THF) of polarity is acrylate modified is better than the modification of fluorine-containing, and, used the surface corrosion vestige of the acrylate modified bonding base material of emulsion adhesive of tetrahydrofuran (THF) obviously more a lot of than other latex gluing of surfaces from also as can be seen by the surface of sticking base material.
The consumption of soft monomer preferably is higher than the consumption of soft monomer in the nuclear consitution monomer in the described shell constituent monomers, make prepared emulsion have the strong adhesion of shell part, the strong characteristics of force of cohesion of nuclear part, this structure has solved when increasing sticking power, and force of cohesion is descended and elongated problem set time.The second-order transition temperature of the prepared emulsion shell of the present invention is 0--30 ℃, and the second-order transition temperature of nuclear is 20--10 ℃.
The acrylic acid emulsion adhesive of the present invention preparation, its solid content is 42-60%, can be used in rubber, metal, materials such as the metal of aluminizing, PE, can replace solvents type tackiness agent in a lot of occasions, have advantages such as low VOC, low cost.
Embodiment:
Embodiment 1 prescription following (g):
Nuclear consitution: shell component:
Butyl acrylate: 45 butyl acrylates: 60
Methyl methacrylate: 35 methyl methacrylates: 15
Vinylbenzene: 20 vinylbenzene: 15
Methacrylic acid: 3 methacrylic acids: 5
Hydroxyethyl methylacrylate: 1.5 hydroxyethyl methylacrylates: 2.5
OP-10:1.0 tetrahydrofuran methyl vinylformic acid 8
Ester:
Sodium dodecylbenzene sulfonate: 1.5 Sodium dodecylbenzene sulfonatees: 0.5
Ammonium persulfate: 0.6 OP-10:0.5
Sodium bicarbonate: 0.5 ammonium persulfate: 0.3
Deionized water: 130 deionized waters: 70
Synthesis step:
(1) will mix in 0.5g sodium bicarbonate, 0.5g OP-10 and 1.0g Sodium dodecylbenzene sulfonate and the adding 70g deionized water, and then add 20g nuclear consitution mix monomer, high-speed stirring 20min gets pre-emulsion;
(2) pre-emulsion is moved in the four-hole boiling flask, under the condition of 100-150r/min, be warming up to about 70 ℃, add 0.4g ammonium persulfate initiator, reacting refluxes to the flask walls monomer-free promptly gets seed emulsion;
(3) remaining nuclear consitution is added dropwise in the seed emulsion slowly, dropwised in 1.5 hours, remaining emulsifying agent, initiator and deionized water in the nuclear consitution are added in the centre, and monomer adds afterreaction promptly gets emulsion to the monomer-free backflow nuclear part;
(4) again shell component mixed solution slowly is added dropwise in the emulsion of step (3) preparation, but emulsifying agent, initiator and deionized water in the component are added in the centre, monomer dropwised in 2 hours, be warming up to 90 ℃ of reactions 1 hour after dropwising, transfer Ph value to 7-8 promptly to obtain acrylic acid emulsion adhesive.
With the emulsion adhesive adhesive rubber sample that makes, record location and set time, on the electron detachment trier, carry out peel strength test after the completely solidified according to GB/T2791-1995 standard, carry out the tensile shear strength test according to USS ASTM D 4501 simultaneously, test result sees Table 1.
Embodiment 2 is changed to fluorine-containing with the tetrahydrofuran (THF) acrylate among the embodiment 1, and other prescriptions are constant with preparation process.
According to embodiment 1 same testing method the performance of emulsion adhesive is tested, its test result sees Table 1
The tetrahydrofuran (THF) acrylate that embodiment 3 removes among the embodiment 1, other prescriptions are constant with preparation process.
According to embodiment 1 same testing method the performance of emulsion adhesive is tested equally, its test result sees Table 1
Every performance data contrast of the emulsion adhesive that table 1 embodiment 1, embodiment 2 and embodiment 3 make
|
Embodiment 1 |
Embodiment 2 |
Embodiment 3 |
Setting time |
8h |
8h |
6h |
Set time |
4 days |
4 days |
3 days |
Stripping strength |
3N/15mm |
2.5N/15mm |
0.4N/15mm |
Shearing resistance |
5Mpa |
4.6Mpa |
3.0Mpa |
As can be seen from the above table, the adding of modification acrylate all improves a lot to the stripping strength and the shearing resistance of emulsion glue, and its adding will be much larger than the influence to shearing resistance to the influence of strength of glass; It can also be seen that the stripping strength of the emulsion glue that adds the stronger tetrahydrofuran methyl acrylate of polarity and the emulsion glue that shearing resistance all is better than the fluorine-containing modification by contrasting us; The adding of modification acrylate is to the location of emulsion glue and exist certain influence set time, but influence is not very big, in the acceptable scope.
Embodiment 4 prescriptions following (g):
Nuclear consitution: shell component:
Butyl acrylate: 40 butyl acrylates: 65
Methyl methacrylate: 35 methyl methacrylates: 15
Vinylbenzene: 25 vinylbenzene: 10
Methacrylic acid: 3 methacrylic acids: 5
Hydroxyethyl methylacrylate: 1.5 hydroxyethyl methylacrylates: 2.5
OP-10:1.0 tetrahydrofuran methyl vinylformic acid 5
Ester:
Sodium dodecylbenzene sulfonate: 2.0 Sodium dodecylbenzene sulfonatees: 2.0
Ammonium persulfate: 1.0 OP-10:1.0
Sodium bicarbonate: 0.5 ammonium persulfate: 0.6
Deionized water: 130 deionized waters: 70
Synthesis step:
(1) will mix in 0.5g sodium bicarbonate, 0.5g OP-10 and 1.0g Sodium dodecylbenzene sulfonate and the adding 70g deionized water, and then add 20g nuclear consitution mix monomer, high-speed stirring 20min gets pre-emulsion;
(2) pre-emulsion is moved in the four-hole boiling flask, under the condition of 100-150r/min, be warming up to about 80 ℃, add 0.6g ammonium persulfate initiator, reacting refluxes to the flask walls monomer-free promptly gets seed emulsion;
(3) remaining nuclear consitution is added dropwise in the seed emulsion slowly, dropwised in 1.5 hours, remaining emulsifying agent, initiator and deionized water in the nuclear consitution are added in the centre, and monomer adds afterreaction promptly gets emulsion to the monomer-free backflow nuclear part;
(4) again shell component mixed solution slowly is added dropwise in the emulsion of step (3) preparation, but emulsifying agent, initiator and deionized water in the component are added in the centre, monomer dropwised in 2 hours, be warming up to 90 ℃ of reactions 1 hour after dropwising, transfer Ph value to 7-8 promptly to obtain acrylic acid emulsion adhesive.
Embodiment 5 prescriptions following (g):
Nuclear consitution: shell component:
Butyl acrylate: 40 butyl acrylates: 65
Methyl methacrylate: 35 methyl methacrylates: 15
Vinylbenzene: 25 vinylbenzene: 15
Methacrylic acid: 3.0 methacrylic acids: 1.0
Hydroxyethyl methylacrylate: 2.0 hydroxyethyl methylacrylates: 1.0
OP-10:2.5 tetrahydrofuran methyl vinylformic acid 3
Ester:
Sodium dodecylbenzene sulfonate: 4.0 Sodium dodecylbenzene sulfonatees: 3.5
Ammonium persulfate: 0.3 OP-10:2.0
Sodium bicarbonate: 0.2 ammonium persulfate: 0.1
Deionized water: 130 deionized waters: 70
Synthesis step:
(1) will mix in 0.2g sodium bicarbonate, 1.5g OP-10 and 2.0g Sodium dodecylbenzene sulfonate and the adding 70g deionized water, and then add 20g nuclear consitution mix monomer, high-speed stirring 20min gets pre-emulsion;
(2) pre-emulsion is moved in the four-hole boiling flask, under the condition of 100-150r/min, be warming up to about 78 ℃, add 0.2g ammonium persulfate initiator, reacting refluxes to the flask walls monomer-free promptly gets seed emulsion;
(3) remaining nuclear consitution is added dropwise in the seed emulsion slowly, dropwised in 1.5 hours, remaining emulsifying agent, initiator and deionized water in the nuclear consitution are added in the centre, and monomer adds afterreaction promptly gets emulsion to the monomer-free backflow nuclear part;
(4) again shell component mixed solution slowly is added dropwise in the emulsion of step (3) preparation, but emulsifying agent, initiator and deionized water in the component are added in the centre, monomer dropwised in 2 hours, be warming up to 90 ℃ of reactions 1 hour after dropwising, transfer Ph value to 7-8 promptly to obtain acrylic acid emulsion adhesive.
Embodiment 6 prescriptions following (g):
Nuclear consitution: shell component:
Butyl acrylate: 25 butyl acrylates: 65
Methyl methacrylate: 40 methyl methacrylates: 15
Vinylbenzene: 30 vinylbenzene: 15
Methacrylic acid: 3.0 methacrylic acids: 1.0
Hydroxyethyl methylacrylate: 2.0 hydroxyethyl methylacrylates: 1.0
OP-10:1.5 tetrahydrofuran methyl vinylformic acid 10
Ester:
Sodium dodecylbenzene sulfonate: 3.0 Sodium dodecylbenzene sulfonatees: 3.0
Ammonium persulfate: 0.3 OP-10:2.0
Sodium bicarbonate: 0.4 ammonium persulfate: 0.2
Deionized water: 140 deionized waters: 80
Synthesis step:
(1) will mix in 0.4g sodium bicarbonate, 1.0g OP-10 and 2.0g Sodium dodecylbenzene sulfonate and the adding 70g deionized water, and then add 20g nuclear consitution mix monomer, high-speed stirring 20min gets pre-emulsion;
(2) pre-emulsion is moved in the four-hole boiling flask, under the condition of 100-150r/min, be warming up to about 78 ℃, add 0.2g ammonium persulfate initiator, reacting refluxes to the flask walls monomer-free promptly gets seed emulsion;
(3) remaining nuclear consitution is added dropwise in the seed emulsion slowly, dropwised in 1.5 hours, remaining emulsifying agent, initiator and deionized water in the nuclear consitution are added in the centre, and monomer adds afterreaction promptly gets emulsion to the monomer-free backflow nuclear part;
(4) again shell component mixed solution slowly is added dropwise in the emulsion of step (3) preparation, but emulsifying agent, initiator and deionized water in the component are added in the centre, monomer dropwised in 2 hours, be warming up to 90 ℃ of reactions 1 hour after dropwising, transfer Ph value to 7-8 promptly to obtain acrylic acid emulsion adhesive.
Embodiment 7 prescriptions following (g):
Nuclear consitution: shell component:
Butyl acrylate: 50 butyl acrylates: 65
Methyl methacrylate: 30 methyl methacrylates: 10
Vinylbenzene: 20 vinylbenzene: 15
Methacrylic acid: 3.0 methacrylic acids: 1.0
Hydroxyethyl methylacrylate: 2.0 hydroxyethyl methylacrylates: 1.0
OP-10:2.5 fluorine-containing: 5
Sodium dodecylbenzene sulfonate: 4.0 Sodium dodecylbenzene sulfonatees: 3.5
Ammonium persulfate: 0.6 OP-10:2.0
Sodium bicarbonate: 0.5 ammonium persulfate: 0.3
Deionized water: 150 deionized waters: 80
Synthesis step:
(1) will mix in 0.5g sodium bicarbonate, 1.5g OP-10 and 2.0g Sodium dodecylbenzene sulfonate and the adding 70g deionized water, and then add 20g nuclear consitution mix monomer, high-speed stirring 20min gets pre-emulsion;
(2) pre-emulsion is moved in the four-hole boiling flask, under the condition of 100-150r/min, be warming up to about 78 ℃, add 0.2g ammonium persulfate initiator, reacting refluxes to the flask walls monomer-free promptly gets seed emulsion;
(3) remaining nuclear consitution is added dropwise in the seed emulsion slowly, dropwised in 1.5 hours, remaining emulsifying agent, initiator and deionized water in the nuclear consitution are added in the centre, and monomer adds afterreaction promptly gets emulsion to the monomer-free backflow nuclear part;
(4) again shell component mixed solution slowly is added dropwise in the emulsion of step (3) preparation, but emulsifying agent, initiator and deionized water in the component are added in the centre, monomer dropwised in 2 hours, be warming up to 90 ℃ of reactions 1 hour after dropwising, transfer Ph value to 7-8 promptly to obtain acrylic acid emulsion adhesive.