CN110066360B - Anti-tack-back water-based acrylic emulsion and preparation method and application thereof - Google Patents
Anti-tack-back water-based acrylic emulsion and preparation method and application thereof Download PDFInfo
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- CN110066360B CN110066360B CN201910269118.7A CN201910269118A CN110066360B CN 110066360 B CN110066360 B CN 110066360B CN 201910269118 A CN201910269118 A CN 201910269118A CN 110066360 B CN110066360 B CN 110066360B
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08J2327/06—Homopolymers or copolymers of vinyl chloride
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
- C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J2433/10—Homopolymers or copolymers of methacrylic acid esters
- C08J2433/12—Homopolymers or copolymers of methyl methacrylate
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Abstract
The invention discloses an anti-tack water-based acrylic emulsion, a preparation method and an application thereof, wherein the formula comprises the following components in parts by weight: 15-17 parts of a soft monomer; 75-80 parts of hard monomer; 1-3 parts of methacrylic acid; 3-5 parts of a crosslinking monomer; 3-5 parts of a composite emulsifier; 0.2-0.8 part of initiator; 0.5-1 part of ammonia water; 0.2-0.8 part of ammonium bicarbonate; 110 portions and 125 portions of deionized water. The anti-tack-back water-based acrylic emulsion has the advantages of easily available preparation raw materials, low price and suitability for industrial production; the preparation method is simple, the temperature is easy to control, and the obtained emulsion has uniform particle size; the anti-tack-back water-based acrylic emulsion is coated on a PVC plate, and has excellent anti-tack performance, excellent adhesive force, water resistance and freeze-thaw stability.
Description
Technical Field
The invention relates to an anti-tack aqueous acrylic emulsion, and a preparation method and application thereof, and belongs to the technical field of macromolecules.
Background
With the enhancement of people's awareness of environmental protection, environmental protection coatings are the development direction of the coating industry in the future. The acrylic coating has excellent gloss, water resistance, stability and construction performance, is rich in raw materials, is easy for molecular design, and can synthesize resin coatings with different performances.
PVC products are widely applied to daily necessities, decorations, toys, artificial leather, wearing articles, furniture surface materials and the like. The properties of PVC surface coatings determine the value of the PVC used, and acrylic coatings are common coatings for PVC surface coatings. The water-based acrylic emulsion takes water as a solvent, is non-combustible, non-explosive, almost free of VOCs emission, safe, green and environment-friendly, and is the development direction of the packaging and printing industry. However, the single-component acrylic resin has the defects of hot stickiness and cold brittleness, and the application of the single-component acrylic resin in the fields of furniture, toys, artificial leather and the like is limited.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the anti-tack water-based acrylic emulsion, and the preparation method and the application thereof.
In order to solve the technical problems, the invention provides an anti-tack water-based acrylic emulsion, which comprises the following components in parts by weight:
15-17 parts of a soft monomer;
75-80 parts of hard monomer;
1-3 parts of methacrylic acid;
3-5 parts of a crosslinking monomer;
3-5 parts of a composite emulsifier;
0.2-0.8 part of initiator;
0.5-1 part of ammonia water;
0.2-0.8 part of ammonium bicarbonate;
110 portions and 125 portions of deionized water.
Preferably, the soft monomer is one or more of butyl acrylate, isooctyl acrylate and ethyl acrylate.
Preferably, the hard monomer is one or more of methyl methacrylate, tert-butyl methacrylate and ethyl methacrylate.
Preferably, the crosslinking monomer is any combination of two or more of hydroxyethyl methacrylate, N-methylolacrylamide, vinyl triethoxysilane and ethylene glycol dimethacrylate.
Preferably, the complex emulsifier is a mixture of anionic emulsifier and nonionic emulsifier; the anionic emulsifier is one or more of sodium dodecyl diphenyl ether disulfonate, sodium fatty alcohol ether sulfate (C12-C14), sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether-3-carboxyl-1-sulfopropionate disodium salt (C10-C16); the nonionic emulsifier is one or more of (C12-C14 secondary alcohol) polyalkyl ether, (C12-C14 secondary alcohol) polyethylene oxide alkyl ether, octyl phenol polyoxyethylene ether, alkyl alcohol polyether (A-980) and acetylenic diol (surfadol 541H).
Preferably, the initiator is one or any combination of sodium persulfate, ammonium persulfate, potassium persulfate and tert-butyl hydroperoxide.
The invention also provides a preparation method of the anti-tack water-based acrylic emulsion, which comprises the following steps:
(1) adding the composite emulsifier into deionized water, adding the soft monomer, the methacrylic acid, the hard monomer and the crosslinking monomer after uniformly stirring, and stirring for more than 30 min;
(2) adding an initiator and ammonium bicarbonate into deionized water, and uniformly stirring;
(3) adding another compound emulsifier into deionized water, starting stirring, heating to 80-85 ℃, sequentially adding an initiator and 4% of the pre-emulsion prepared in the step (1), after the reaction is started, simultaneously dropwise adding the solution prepared in the step (2) and the rest of the pre-emulsion prepared in the step (1), wherein the dropwise adding time is 1.5-3h, continuously reacting for 1-3h after the dropwise adding is finished, cooling to 30-45 ℃, adjusting the pH to 7-9, and finally filtering to obtain the water-based acrylic emulsion.
Meanwhile, the invention also provides application of the anti-tack water-based acrylic emulsion in coating the PVC surface.
In conclusion, the invention has the following beneficial effects:
(1) the anti-tack-back water-based acrylic emulsion has the advantages of easily available preparation raw materials, low price and suitability for industrial production;
(2) the preparation method of the anti-tack aqueous acrylic emulsion is simple, the temperature is easy to control, and the obtained emulsion has uniform particle size;
(3) the anti-after-tack water-based acrylic emulsion prepared by the invention is coated on a PVC plate, and has excellent anti-after-tack performance, excellent adhesive force, water resistance and freeze-thaw stability.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The anti-tack water-based acrylic emulsion comprises the following components in parts by weight:
15-17 parts of a soft monomer;
75-80 parts of hard monomer;
1-3 parts of methacrylic acid;
3-5 parts of a crosslinking monomer;
3-5 parts of a composite emulsifier;
0.2-0.8 part of initiator;
0.5-1 part of ammonia water;
0.2-0.8 part of ammonium bicarbonate;
110 portions and 125 portions of deionized water.
A preparation method of the anti-tack water-based acrylic emulsion comprises the following steps:
(1) adding the composite emulsifier into deionized water, adding the soft monomer, the methacrylic acid, the hard monomer and the crosslinking monomer after uniformly stirring, and stirring for more than 30 min;
(2) adding an initiator and ammonium bicarbonate into deionized water, and uniformly stirring;
(3) adding another compound emulsifier into deionized water, starting stirring, heating to 80-85 ℃, sequentially adding an initiator and 4% of the pre-emulsion prepared in the step (1), after the reaction is started, simultaneously dropwise adding the solution prepared in the step (2) and the rest of the pre-emulsion prepared in the step (1), wherein the dropwise adding time is 1.5-3h, continuously reacting for 1-3h after the dropwise adding is finished, cooling to 30-45 ℃, adjusting the pH to 7-9, and finally filtering to obtain the water-based acrylic emulsion.
The prepared anti-tack water-based acrylic emulsion is applied to coating the PVC surface.
Example 1
The formula of the anti-tack water-based acrylic emulsion is shown in Table 1.
The invention discloses a preparation method of anti-tack water-based acrylic emulsion, which comprises the following steps:
(1) adding 0.73g of sodium dodecyl diphenyl ether disulfonate and 0.45g of nonionic emulsifier A-980 into 77.50g of deionized water, adding 15g of butyl acrylate, 1g of methacrylic acid, 75g of methyl methacrylate, 1.08g of hydroxyethyl methacrylate, 1.27g of N-hydroxymethyl acrylamide and 0.76g of vinyltriethoxysilane after uniformly stirring, and stirring for 30 min;
(2) adding 0.15 part of ammonium persulfate and 0.20g of ammonium bicarbonate into 5.50g of deionized water, and uniformly stirring;
(3) adding 0.4g of sodium dodecyl diphenyl ether disulfonate, 0.33 part of nonionic emulsifier A-980 and 1.22 parts of nonionic emulsifier acetylenic diol (surfadol 541H) into 27g of deionized water, starting stirring, heating to 80 ℃, adding 0.05g of ammonium persulfate and 4% of the pre-emulsion prepared in the step (1), after the reaction is started, simultaneously dropwise adding the solution prepared in the step (2) and the rest of the pre-emulsion prepared in the step (1), wherein the dropwise adding time is 1.5H, continuously reacting for 1H after the dropwise adding is finished, cooling to 30 ℃, adjusting the pH value to 7-9, and finally filtering to obtain the water-based acrylic emulsion.
The obtained anti-tack water-based acrylic emulsion is coated on the surface of PVC.
Example 2
The formula of the anti-tack water-based acrylic emulsion is shown in Table 1.
The invention discloses a preparation method of anti-tack water-based acrylic emulsion, which comprises the following steps:
(1) adding 1.73g of sodium dodecyl diphenyl ether disulfonate and 0.95g of nonionic emulsifier A-980 into 80.50g of deionized water, adding 16.05g of butyl acrylate, 2.19g of methacrylic acid, 77.88g of methyl methacrylate, 1.74g of ethylene glycol dimethacrylate, 1.04g of N-hydroxymethyl acrylamide and 1.22g of vinyl triethoxysilane after uniformly stirring, and stirring for 30 min;
(2) adding 0.45g of ammonium persulfate and 0.49g of ammonium bicarbonate into 7.50g of deionized water, and uniformly stirring;
(3) 0.4g of sodium dodecyl diphenyl ether disulfonate, 0.83 part of nonionic emulsifier A-980 and 0.02g of nonionic emulsifier acetylenic diol (surfadol 541H) are added into 30g of deionized water, stirring is started, the temperature is increased to 85 ℃, 0.11g of ammonium persulfate and 4% of the pre-emulsion prepared in the step (1) are added, after the reaction is started, the solution prepared in the step (2) and the rest of the pre-emulsion prepared in the step (1) are simultaneously dripped for 2.5H, the reaction is continued for 2H after the dripping is finished, the temperature is reduced to 40 ℃, the pH is adjusted to 7-9, and finally the water-based acrylic emulsion is obtained by filtering.
The obtained anti-tack water-based acrylic emulsion is coated on the surface of PVC.
Example 3
The formula of the anti-tack water-based acrylic emulsion is shown in Table 1.
The invention discloses a preparation method of anti-tack water-based acrylic emulsion, which comprises the following steps:
(1) adding 1.73g of sodium dodecyl diphenyl ether disulfonate and 0.95g of nonionic emulsifier A-980 into 77.50g of deionized water, adding 17g of butyl acrylate, 3g of methacrylic acid, 80g of methyl methacrylate, 1.45g of hydroxyethyl methacrylate, 0.21g of ethylene glycol dimethacrylate, 2.50g of N-hydroxymethyl acrylamide and 0.84g of vinyl triethoxysilane after uniformly stirring, and stirring for 30 min;
(2) adding 0.65g of ammonium persulfate and 0.80g of ammonium bicarbonate into 5.50g of deionized water, and uniformly stirring;
(3) 0.4g of sodium dodecyl diphenyl ether disulfonate, 0.83 part of nonionic emulsifier A-980 and 0.02g of nonionic emulsifier acetylenic diol (surfadol 541H) are added into 27g of deionized water, stirring is started, the temperature is increased to 85 ℃, 0.15g of ammonium persulfate and 4% of the pre-emulsion prepared in the step (1) are added, after the reaction is started, the solution prepared in the step (2) and the rest of the pre-emulsion prepared in the step (1) are simultaneously dripped, the dripping time is 3 hours, the reaction is continued for 3 hours after the dripping is finished, the temperature is reduced to 45 ℃, the pH is adjusted to 7-9, and finally, the water-based acrylic emulsion is obtained by filtering.
The obtained anti-tack water-based acrylic emulsion is coated on the surface of PVC.
Example 4
The formula of the anti-tack water-based acrylic emulsion is shown in Table 1.
The invention discloses a preparation method of anti-tack water-based acrylic emulsion, which comprises the following steps:
(1) adding 1.73g of sodium dodecyl diphenyl ether disulfonate and 0.95g of nonionic emulsifier A-980 into 82.50g of deionized water, adding 17g of butyl acrylate, 3g of methacrylic acid, 80g of methyl methacrylate, 1.45g of hydroxyethyl methacrylate, 0.21g of ethylene glycol dimethacrylate, 2.50g of N-hydroxymethyl acrylamide and 0.84g of vinyl triethoxysilane after uniformly stirring, and stirring for 30 min;
(2) adding 0.65g of ammonium persulfate and 0.80g of ammonium bicarbonate into 7.50g of deionized water, and uniformly stirring;
(3) taking 0.4g of sodium dodecyl diphenyl ether disulfonate, 0.83 part of nonionic emulsifier A-980 and 0.02g of nonionic emulsifier acetylenic diol (surfadol 541H) in use amount, adding into 35g of deionized water, starting stirring, heating to 85 ℃, adding 0.15g of ammonium persulfate and 4% of the pre-emulsion prepared in the step (1), after the reaction is started, simultaneously dropwise adding the solution prepared in the step (2) and the rest of the pre-emulsion prepared in the step (1), wherein the dropwise adding time is 3H, continuing the reaction for 3H after the dropwise addition is finished, cooling to 45 ℃, adjusting the pH to 7-9, and finally filtering to obtain the water-based acrylic emulsion.
The obtained anti-tack water-based acrylic emulsion is coated on the surface of PVC.
Example 5
The formula of the anti-tack water-based acrylic emulsion is shown in Table 1.
The invention discloses a preparation method of anti-tack water-based acrylic emulsion, which comprises the following steps:
(1) adding 0.73g of sodium dodecyl diphenyl ether disulfonate and 0.45g of nonionic emulsifier A-980 into 77.50g of deionized water, adding 15g of butyl acrylate, 1g of methacrylic acid, 80g of methyl methacrylate, 1.08g of hydroxyethyl methacrylate, 1.27g of N-hydroxymethyl acrylamide and 0.76g of vinyltriethoxysilane after uniformly stirring, and stirring for 30 min;
(2) adding 0.15g of ammonium persulfate and 0.20g of ammonium bicarbonate into 5.50g of deionized water, and uniformly stirring;
(3) 0.4g of sodium dodecyl diphenyl ether disulfonate, 0.33 part of nonionic emulsifier A-980 and 1.22g of nonionic emulsifier acetylenic diol (surfadol 541H) are added into 27g of deionized water, stirring is started, the temperature is increased to 85 ℃, 0.05g of ammonium persulfate and 4% of the pre-emulsion prepared in the step (1) are added, after the reaction is started, the solution prepared in the step (2) and the rest of the pre-emulsion prepared in the step (1) are simultaneously dripped, the dripping time is 3 hours, the reaction is continued for 3 hours after the dripping is finished, the temperature is reduced to 45 ℃, the pH is adjusted to 7-9, and finally, the water-based acrylic emulsion is obtained by filtering.
The obtained anti-tack water-based acrylic emulsion is coated on the surface of PVC.
Example 6
The formula of the anti-tack water-based acrylic emulsion is shown in Table 1.
The invention discloses a preparation method of anti-tack water-based acrylic emulsion, which comprises the following steps:
(1) adding 0.73g of sodium dodecyl diphenyl ether disulfonate and 0.45g of nonionic emulsifier A-980 into 77.50g of deionized water, adding 15g of butyl acrylate, 3g of methacrylic acid, 75g of methyl methacrylate, 1.45g of hydroxyethyl methacrylate, 0.21g of ethylene glycol dimethacrylate, 2.50g of N-hydroxymethyl acrylamide and 0.84g of vinyl triethoxysilane after uniformly stirring, and stirring for 30 min;
(2) adding 0.15g of ammonium persulfate and 0.20g of ammonium bicarbonate into 5.50g of deionized water, and uniformly stirring;
(3) 0.4g of sodium dodecyl diphenyl ether disulfonate, 0.33 part of nonionic emulsifier A-980 and 1.22g of nonionic emulsifier acetylenic diol (surfadol 541H) are added into 27g of deionized water, stirring is started, the temperature is increased to 85 ℃, 0.05g of ammonium persulfate and 4% of the pre-emulsion prepared in the step (1) are added, after the reaction is started, the solution prepared in the step (2) and the rest of the pre-emulsion prepared in the step (1) are simultaneously dripped, the dripping time is 3 hours, the reaction is continued for 3 hours after the dripping is finished, the temperature is reduced to 45 ℃, the pH is adjusted to 7-9, and finally, the water-based acrylic emulsion is obtained by filtering.
The obtained anti-tack water-based acrylic emulsion is coated on the surface of PVC.
TABLE 1
| Raw materials | Example 1 | Example 2 | Embodiment 3 | Example 4 | Example 5 | Example 6 |
| Butyl acrylate (g) | 15 | 16.05 | 17 | 17 | 15 | 15 |
| Methacrylic acid (g) | 1 | 2.19 | 3 | 3 | 1 | 3 |
| Methyl methacrylate (g) | 75 | 77.88 | 80 | 80 | 80 | 75 |
| Hydroxyethyl methacrylate (g) | 1.08 | - | 1.45 | 1.45 | 1.08 | 1.45 |
| Ethylene glycol dimethacrylate (g) | - | 1.74 | 0.21 | 0.21 | - | 0.21 |
| N-methylolacrylamide (g) | 1.27 | 1.04 | 2.50 | 2.50 | 1.27 | 2.50 |
| Vinyl trisEthoxysilane (g) | 0.76 | 1.22 | 0.84 | 0.84 | 0.76 | 0.84 |
| Sodium dodecyl diphenyl ether disulfonate (g) | 1.13 | 2.13 | 2.13 | 2.13 | 1.13 | 1.13 |
| A-980（g） | 0.78 | 1.78 | 1.78 | 1.78 | 0.78 | 0.78 |
| surfadol 541H（g） | 1.22 | 0.02 | 0.02 | 0.02 | 1.22 | 1.22 |
| Aqueous ammonia | 0.58 | 0.77 | 1 | 1 | 0.58 | 0.58 |
| Ammonium bicarbonate (g) | 0.20 | 0.49 | 0.80 | 0.80 | 0.20 | 0.20 |
| Ammonium persulfate (g) | 0.20 | 0.56 | 0.80 | 0.80 | 0.20 | 0.20 |
| Deionized water (g) | 110 | 118 | 110 | 125 | 110 | 110 |
The anti-tack aqueous acrylic emulsions of examples 1-6, obtained according to the formulation of Table 1 and the preparation method of the anti-tack aqueous acrylic emulsions of examples 1-6, were wiped off a clean PVC sheet with a 100 μm applicator, dried at room temperature for 48 hours, and measured according to GB/T1762-80.
The film obtained by coating in examples 1 to 6 was measured for film hardness by the manual method in GB/T6739-1996.
Freeze-thaw stability of the anti-tack aqueous acrylic emulsions obtained in examples 1 to 6 was measured: a50 ml sample is put into a cylindrical plastic container or a glass container of about 100ml, a lid is closed to seal the container, the container is put into a low temperature oven at (-10 +/-2) DEG C for 16 hours and then taken out, the container is placed at (20 +/-2) DEG C for 8 hours, the process is repeated for 3 times, the container is opened, the sample is stirred by a glass rod, and the presence or absence of abnormal phenomena such as hard lumps and agglomeration of the sample is observed.
Determination of Water resistance: weighing the prepared film, soaking the film in water at 23 ℃ for 48h, taking out the film, sucking out surface moisture, weighing, observing appearance change and calculating the mass increase percentage of the film after soaking.
Solvent resistance determination: weighing the prepared film, respectively soaking the film in ethanol and acetone for 48h, taking out the film, absorbing the surface moisture, weighing, observing appearance change and calculating the mass increase percentage of the film after the film is soaked in the organic solvent.
And (3) wear resistance measurement: the detection is carried out according to GB/T1768-.
And (3) adhesive force determination: coating the prepared test sample on a base material to a thickness of 50 mu m, and drying and standing the coating for 24 hours; rolling the surface of the substrate coated with 3M adhesive tape for 3 times by using a compression roller with a certain load, standing for 5min, clamping the test sample at a fixed end, clamping the adhesive tape at a moving end, and pulling at the speed of 0.6-1.0M/s according to a method for testing 180-degree peel strength to uncover the adhesive tape; the exposed part was covered with a 2mm by 2mm translucent plastic sheet and the adhesion was calculated according to the following formula:
S=(A1/A0)*100%
wherein A is1Area of exfoliation, A0Is the total area.
The 0 level represents that the cutting edge is completely smooth and no lattice falls off;
level 1 represents that a little coating falls off at the intersection, and the affected area cannot be obviously more than 5%;
level 2 represents that the coating falls off at the intersection of the cuts or along the edges of the cuts, and the influence area is 5-15%;
the cross cutting area of the 3-grade coating which is affected by large-area falling along the cutting edge part or the whole is 15 to 35 percent;
the whole 4-level lattice falls off along the edge, and some lattices partially or completely fall off, so that the affected area is 35-65%;
the degree of grade 5 exfoliation was over 65%.
The glass transition temperature was measured by DSC at a temperature increase rate of 10 ℃/min from 20 ℃ to 120 ℃.
The measured performance data of the anti-tack aqueous acrylic emulsion obtained in examples 1 to 6 and the coating film coated on the PVC plate are shown in table 2:
TABLE 2
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | |
| Anti-tack property | Grade 3 | Stage 2 | Level 1 | Stage 2 | Stage 2 | Stage 2 |
| Hardness of coating film | 2H | 3H | 5H | 4H | 3H | 5H |
| Freeze thaw stability | Without floc | Without floc | Without floc | Without floc | Without floc | Without floc |
| Initial mass of film (g) | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 |
| Quality of film after immersion in Water (g) | 0.025 | 0.024 | 0.021 | 0.022 | 0.024 | 0.0.022 |
| Initial mass of film (g) | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 |
| Quality of film after ethanol immersion (g) | 0.030 | 0.028 | 0.021 | 0.022 | 0.024 | 0.0.022 |
| Initial mass of film (g) | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 |
| Quality of film after acetone immersion (g) | 0.027 | 0.026 | 0.022 | 0.024 | 0.024 | 0.023 |
| Adhesion force | 4 stage | Grade 3 | Level 1 | Stage 2 | Stage 2 | Level 1 |
| Poor quality (g) before and after abrasion resistance test | 0.010 | 0.009 | 0.002 | 0.004 | 0.008 | 0.003 |
| Glass transition temperature (. degree. C.) | 32 | 33 | 39 | 35 | 35 | 33 |
Table 2 shows performance test tables of different examples, and it can be known from the tables that the tack of the obtained acrylic emulsion with anti-tack property is enhanced with the increase of the proportion of the hard monomer, and the hardness of the coating film is enhanced with the increase of the addition amount of the hard monomer and methacrylic acid, because the polymerization degree of the whole coating film is increased due to the increase of the crosslinking degree, and the hardness of the coating film is increased due to the increase of the hard monomer; the anti-tack acrylic emulsion has good freeze-thaw stability and no flocculation phenomenon; the adhesive force and the wear resistance of a paint film prepared from the anti-tack acrylic emulsion are enhanced along with the increase of the cross-linking agent and methacrylic acid, because the adhesive force and the wear resistance of the paint film are enhanced due to the increase of the cross-linking degree, and the water resistance and the solvent resistance of the film are strong as can be seen from the table 2; as can be seen from the table, the glass transition temperature increases with increasing amounts of hard monomer and methacrylic acid added as the content of each formulation changes.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (4)
1. The anti-tack-back water-based acrylic emulsion is characterized by comprising the following raw materials in parts by weight:
the soft monomer is butyl acrylate;
the hard monomer is methyl methacrylate;
the crosslinking monomer is any combination of at least three of hydroxyethyl methacrylate, N-hydroxymethyl acrylamide, vinyl triethoxysilane and ethylene glycol dimethacrylate;
the preparation method of the anti-tack water-based acrylic emulsion comprises the following steps:
(1) adding the composite emulsifier into deionized water, and after uniformly stirring, adding the soft monomer, the methacrylic acid, the hard monomer and the crosslinking monomer, and stirring for more than 30 min;
(2) adding an initiator and ammonium bicarbonate into deionized water, and uniformly stirring;
(3) adding another compound emulsifier into deionized water, starting stirring, heating to 80-85 ℃, sequentially adding an initiator and 4% of the pre-emulsion prepared in the step (1), after the reaction is started, simultaneously dropwise adding the solution prepared in the step (2) and the rest of the pre-emulsion prepared in the step (1), wherein the dropwise adding time is 1.5-3h, continuously reacting for 1-3h after the dropwise adding is finished, cooling to 30-45 ℃, adjusting the pH to 7-9, and finally filtering to obtain the water-based acrylic emulsion.
2. The anti-tack back water-based acrylic emulsion of claim 1, wherein the complex emulsifier is a mixture of an anionic emulsifier and a nonionic emulsifier; the anionic emulsifier is one or more of sodium dodecyl diphenyl ether disulfonate, sodium fatty alcohol ether sulfate (C12-C14), sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether-3-carboxyl-1-sulfopropionate disodium salt (C10-C16); the nonionic emulsifier is one or more of (C12-C14 secondary alcohol) polyalkyl ether, (C12-C14 secondary alcohol) polyethylene oxide alkyl ether, octyl phenol polyoxyethylene ether, alkyl alcohol polyether and alkynediol.
3. The anti-tack back water-based acrylic emulsion according to claim 1, wherein the initiator is one or more of sodium persulfate, ammonium persulfate, potassium persulfate and tert-butyl hydroperoxide.
4. Use of the anti-tack aqueous acrylic emulsion according to any one of claims 1 to 3 for coating PVC surfaces.
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