CN116284540A - High-light-transmittance high-viscosity polyacrylic acid thickener and preparation method thereof - Google Patents
High-light-transmittance high-viscosity polyacrylic acid thickener and preparation method thereof Download PDFInfo
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- 229920002125 Sokalan® Polymers 0.000 title claims abstract description 35
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- 238000002834 transmittance Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 21
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- KOMNUTZXSVSERR-UHFFFAOYSA-N 1,3,5-tris(prop-2-enyl)-1,3,5-triazinane-2,4,6-trione Chemical compound C=CCN1C(=O)N(CC=C)C(=O)N(CC=C)C1=O KOMNUTZXSVSERR-UHFFFAOYSA-N 0.000 claims abstract description 16
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- 238000004321 preservation Methods 0.000 claims abstract description 9
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- CERQOIWHTDAKMF-UHFFFAOYSA-N alpha-methacrylic acid Natural products CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims abstract description 5
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- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 5
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- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 3
- ZQMHJBXHRFJKOT-UHFFFAOYSA-N methyl 2-[(1-methoxy-2-methyl-1-oxopropan-2-yl)diazenyl]-2-methylpropanoate Chemical compound COC(=O)C(C)(C)N=NC(C)(C)C(=O)OC ZQMHJBXHRFJKOT-UHFFFAOYSA-N 0.000 claims description 3
- YIVJZNGAASQVEM-UHFFFAOYSA-N Lauroyl peroxide Chemical compound CCCCCCCCCCCC(=O)OOC(=O)CCCCCCCCCCC YIVJZNGAASQVEM-UHFFFAOYSA-N 0.000 claims description 2
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- BWJUFXUULUEGMA-UHFFFAOYSA-N propan-2-yl propan-2-yloxycarbonyloxy carbonate Chemical compound CC(C)OC(=O)OOC(=O)OC(C)C BWJUFXUULUEGMA-UHFFFAOYSA-N 0.000 claims description 2
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- 229920001223 polyethylene glycol Polymers 0.000 description 9
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- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 6
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- FYRWKWGEFZTOQI-UHFFFAOYSA-N 3-prop-2-enoxy-2,2-bis(prop-2-enoxymethyl)propan-1-ol Chemical compound C=CCOCC(CO)(COCC=C)COCC=C FYRWKWGEFZTOQI-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
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- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
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- 125000005250 alkyl acrylate group Chemical group 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- 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
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention belongs to the technical field of polymer materials, and discloses a high-transmittance high-viscosity polyacrylic acid thickener and a preparation method thereof. The preparation method comprises the following steps: adding acrylic acid, a (methyl) acrylic acid alkyl ester hydrophobic monomer, a first cross-linking agent triallyl isocyanurate and an organic solvent into a reactor, heating to 55-65 ℃ under the protection of nitrogen, then dropwise adding an initiator solution, heating to 60-75 ℃ after the initiator is dropwise added, then adding a second cross-linking agent MAL-PEG-MAL for heat preservation reaction, and vacuum drying to remove the organic solvent after the reaction is finished to obtain a product. The invention adopts triallyl isocyanurate with a specific structure as the first crosslinking agent, which can obviously improve the transparency and the dispersibility of the polyacrylic acid neutralization gel. By adding the second crosslinking agent MAL-PEG-MAL and matching the first crosslinking agent, the hydrogel adhesiveness and transparency can be further enhanced, and the smoothness and fineness of the neutralized gel can be improved.
Description
Technical Field
The invention belongs to the technical field of polymer materials, and particularly relates to a high-transmittance high-viscosity polyacrylic acid thickener and a preparation method thereof.
Background
Polyacrylic acid thickeners are referred to as lightly crosslinked acrylic polymers that provide excellent stability and thickening properties to the surfactant system and also have excellent suspension properties even in low viscosity formulations. From a chemical structure point of view, the acrylic polymer backbone or grafted side chains contain hydrophilic groups such as: carboxyl groups, amide groups, sulfonic acid groups, and the like. Most of the polyacrylic acid thickeners are anionic thickeners, and generally have thickening effect after neutralization with alkali.
Polyacrylic acid thickeners can be classified into non-associative and associative types according to the thickening mechanism. Non-associative thickeners are typically water soluble polymers such as hydroxyethylcellulose and polyacrylic emulsions. They thicken the aqueous phase mainly due to stretching and hydration of the macromolecular chains, but do not work significantly at high shear rates. For non-associative thickeners, no hydrophobically modified monomer is present in the molecule, no clustered associative bodies can be produced, and a three-dimensional network structure throughout the entire system is formed. The molecular chain with carboxyl in the thickener is in a curled micelle state under acidic or neutral conditions, after alkali is added into the system, the copolymer in the latex particles is subjected to alkali dissolution, the thickener emulsion at low pH is changed into a high molecular solution, the carboxyl is ionized into carboxylate ions, the high molecular chain is completely dissolved in a water phase under the action of electrostatic repulsion force, and the ionized carboxyl and water form a hydrated ionic state, so that the fluidity of water molecules is hindered, the viscosity of the emulsion is increased, and the thickening purpose is achieved. Associative thickeners are hydrophobically modified water-soluble polymers. The hydrophobic chain segments contained in the emulsion particles can be adsorbed on the emulsion particles and the pigment particles, and are mutually associated to form a network structure to play a role in thickening. The introduction of long chain hydrophobic groups affects the hydrophilicity of the copolymer, and the longer the chain, the greater the probability of intramolecular association, affecting the electrolyte resistance of the product. The hydrophobic modified alkali-soluble thickener is a thickener which introduces hydrophobic groups on the general polymer molecules. When the concentration of hydrophobic groups is low, intramolecular association is mainly formed, as a result of which the coils shrink, and the hydrodynamic volume decreases; since the hydrophobic groups are present in the system in a very low amount, intermolecular association does not substantially occur between each other, and even a small amount of molecules associate together, a three-dimensional network structure cannot be formed, and thus it is insufficient to cause a sharp increase in macroscopic viscosity of the system. When the concentration of the solution is larger than the critical association concentration, the hydrophobic groups are associated, and a new cluster association body taking the hydrophobic groups as the center is formed in the water phase. The formation of such a network structure allows the solution to exhibit macroscopic properties of enhanced viscosity. The network structure formed by the molecular association is firm, and a certain shearing force is needed to break.
Patent CN 103755861A discloses a carbomer and a preparation method thereof, distilled water and tertiary butanol are uniformly mixed according to the proportion, added into a reaction kettle, and electrically stirred, and then nitrogen is introduced to bubble for 20-30 min; the constant pressure dropping funnel was filled with acrylic acid and a crosslinking agent, and maintained at a constant pressure by a balloon filled with nitrogen gas. Heating to 80-90 ℃, adding an initiator, cooling to below 65 ℃, and reacting for 4-8 hours to obtain an aqueous solution carbomer product; and freeze-drying the product obtained by the steps to obtain white lump, and further processing to obtain white and fluffy carbomer powder. The patent adopts an aqueous system for preparation, is difficult to dry and dehydrate, and has poor product dispersion performance.
Patent CN 101312996a discloses a water-soluble copolymer having an alkyl-modified carboxyl group, which is obtained by polymerizing 100 parts by weight of (meth) acrylic acid, 5 to 10 parts by weight of lauryl (meth) acrylate, and 0 to 0.1 parts by weight of a compound having two or more ethylenically unsaturated groups, wherein 1% by weight of the neutralized viscous liquid exhibits a viscosity of 1000mpa·s or less and a light transmittance of 95% or more. However, there is a problem in that the light transmittance of the neutralized viscous liquid of the water-soluble copolymer having an alkyl-modified carboxyl group obtained in the presence of an electrolyte is deteriorated or the liquid is not clear. In addition, since the hydrophobic structure of lauryl (meth) acrylate is introduced, the hydrophilicity of the obtained powder product is reduced, and the dispersion time tends to be long when the powder product is applied as a thickener.
Patent CN 106632799A discloses a preparation method of an acrylic thickener, which comprises the steps of adding 91-98 parts by weight of acrylic acid, 3-9 parts by weight of hydrophobic monomer, 0.5-2 parts by weight of dispersing agent and 0.2-1.5 parts by weight of molecular weight regulator into an organic solvent, heating to 50-70 ℃ under the protection of inert gas, dropwise adding 0.3-1 part by weight of initiator until the reaction is finished, removing the solvent and drying; wherein the dispersing agent consists of an organic dispersing agent and an inorganic dispersing agent, and the weight ratio of the organic dispersing agent to the inorganic dispersing agent is 1:5-10:1. The polymer maintains superior light transmittance and viscosity in the presence of salt, and maintains lower viscosity and superior light transmittance in the absence of inorganic salt. The technology of this patent does not add a crosslinking monomer, and maintains light transmittance and higher viscosity by adding a certain amount of inorganic salt.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the primary purpose of the invention is to provide a preparation method of a high-light-transmittance high-viscosity polyacrylic acid thickener.
Another object of the present invention is to provide a high light transmittance and high viscosity polyacrylic acid thickener prepared by the above method.
The invention aims at realizing the following technical scheme:
the preparation method of the high-light-transmittance high-viscosity polyacrylic acid thickener comprises the following preparation steps:
adding acrylic acid, (methyl) acrylic acid alkyl ester hydrophobic monomer, a first cross-linking agent triallyl isocyanurate and an organic solvent into a reactor, heating to 55-65 ℃ under the protection of nitrogen, then dropwise adding an initiator solution, heating to 60-75 ℃ after the initiator is dropwise added, then adding a second cross-linking agent bismaleimide polyethylene glycol (MAL-PEG-MAL) for heat preservation reaction, and vacuum drying to remove the organic solvent after the reaction is finished, thereby obtaining the high-transmittance high-viscosity polyacrylic acid thickener.
Further, the alkyl (meth) acrylate hydrophobic monomer is an alkyl acrylate or an alkyl methacrylate having 8 to 18 carbon atoms.
Further, the addition amount of the (methyl) acrylic acid alkyl ester hydrophobic monomer is 2-10% of the mass of acrylic acid.
Further, the addition amount of the first crosslinking agent triallyl isocyanurate is 0.05-0.5% of the mass of the acrylic acid.
Further, the organic solvent is at least one of benzene, toluene, n-hexane, cyclohexane and ethyl acetate.
Further, the initiator is at least one of azodiisobutyronitrile, azodiisoheptonitrile, dimethyl azodiisobutyrate, benzoyl peroxide, lauroyl peroxide and diisopropyl peroxydicarbonate.
Further, the addition amount of the initiator is 0.01-0.2% of the mass of the acrylic acid.
Further, the drop time of the initiator solution is 0.5-3 h.
Further, the molecular weight of the second crosslinking agent MAL-PEG-MAL is 2000-20000.
Further, the addition amount of the second crosslinking agent MAL-PEG-MAL is 0.1-1% of the mass of the acrylic acid.
Further, the time of the heat preservation reaction is 1-4 h.
The high-transmittance high-viscosity polyacrylic acid thickener is prepared by the method.
The principle of the invention is as follows: the invention enhances the viscosity of the neutralized hydrogel by introducing associative hydrophobic monomers into the polyacrylic acid structure. Triallyl isocyanurate with a specific structure is used as a first crosslinking agent, and the molecular structural formula of the triallyl isocyanurate is shown in figure 1. It is a crosslinking agent commonly used for preparing plastics and rubber, and is used for improving strength, weather resistance and the like. But less for crosslinking of polyacrylic acid thickeners. The invention can be used for polyacrylic acid crosslinking, and the transparency and the dispersibility of the neutralized gel can be obviously improved compared with other crosslinking agents. It is speculated that the intermediate six-membered ring due to its molecular structure contributes to an improvement in the uniformity of the crosslinked network. The second crosslinking agent bismaleimide polyethylene glycol (MAL-PEG-MAL) is added to be matched with the first crosslinking agent for use, and the MAL-PEG-MAL has a molecular structural formula shown in figure 2. Experiments show that the gel can further enhance the adhesiveness and transparency of the hydrogel and improve the smoothness and fineness of the neutralization gel.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention adopts triallyl isocyanurate with a specific structure as the first crosslinking agent, which can obviously improve the transparency and the dispersibility of the polyacrylic acid neutralization gel.
(2) The invention uses the second cross-linking agent bismaleimide polyethylene glycol (MAL-PEG-MAL) matched with the first cross-linking agent, and experiments show that the second cross-linking agent bismaleimide polyethylene glycol can further enhance the hydrogel adhesiveness and the transparency and improve the smoothness and the fineness of the neutralization gel.
Drawings
FIG. 1 is a diagram showing the molecular structural formula of triallyl isocyanurate as a first crosslinking agent used in the present invention.
FIG. 2 is a diagram showing the molecular structure of a second crosslinking agent, bismaleimide polyethylene glycol (MAL-PEG-MAL), used in the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
Example 1
The preparation method of the high-light-transmittance high-viscosity polyacrylic acid thickener comprises the following preparation steps:
100 parts of acrylic acid, 5 parts of (methyl) dodecyl acrylate hydrophobic monomer, 0.2 part of first cross-linking agent triallyl isocyanurate and 400 parts of mixed solvent of cyclohexane and ethyl acetate are added into a reactor, the temperature is raised to 55-60 ℃ under the protection of nitrogen, then ethyl acetate solution containing 0.05 part of initiator benzoyl peroxide is dropwise added, the dropwise adding time of the initiator is 1h, the temperature is raised to 65-70 ℃ after the dropwise adding of the initiator is completed, then 0.4 part of second cross-linking agent bismaleimide polyethylene glycol (MAL-PEG-MAL) is added for heat preservation reaction for 3.5h, and after the reaction is finished, the organic solvent is removed by vacuum drying, so that a white powdery product is obtained.
Example 2
The preparation method of the high-light-transmittance high-viscosity polyacrylic acid thickener comprises the following preparation steps:
100 parts of acrylic acid, 2 parts of (methyl) octadecyl acrylate hydrophobic monomer, 0.1 part of first cross-linking agent triallyl isocyanurate and 300 parts of mixed solvent of cyclohexane and ethyl acetate are added into a reactor according to parts by weight, the temperature is raised to 55-60 ℃ under the protection of nitrogen, then an ethyl acetate solution containing 0.03 part of initiator azo-diisobutyronitrile is dropwise added, the dropwise adding time of the initiator is 1h, the temperature is raised to 65-70 ℃ after the dropwise adding of the initiator is completed, then 0.5 part of second cross-linking agent bismaleimide polyethylene glycol (MAL-PEG-MAL) is added for heat preservation reaction for 3.5h, and after the reaction is finished, the organic solvent is removed by vacuum drying, so that a white powdery product is obtained.
Example 3
The preparation method of the high-light-transmittance high-viscosity polyacrylic acid thickener comprises the following preparation steps:
100 parts of acrylic acid, 10 parts of (methyl) octadecyl acrylate hydrophobic monomer, 0.5 part of first cross-linking agent triallyl isocyanurate and 500 parts of mixed solvent of cyclohexane and ethyl acetate are added into a reactor, the temperature is raised to 55-60 ℃ under the protection of nitrogen, then an ethyl acetate solution containing 0.1 part of initiator dimethyl azodiisobutyrate is dropwise added, the initiator dropwise adding time is 1.5h, the temperature is raised to 65-70 ℃ after the initiator dropwise adding is finished, then 1 part of second cross-linking agent bismaleimide polyethylene glycol (MAL-PEG-MAL) is added for heat preservation reaction for 1.5h, and after the reaction is finished, the organic solvent is removed by vacuum drying, so that a white powdery product is obtained.
Comparative example 1
In comparison with example 1, the present comparative example uses pentaerythritol triallyl ether instead of triallyl isocyanurate, and the specific preparation steps are as follows:
100 parts of acrylic acid, 5 parts of (methyl) dodecyl acrylate hydrophobic monomer, 0.2 part of first cross-linking agent pentaerythritol triallyl ether and 400 parts of mixed solvent of cyclohexane and ethyl acetate are added into a reactor, the temperature is raised to 55-60 ℃ under the protection of nitrogen, then ethyl acetate solution containing 0.05 part of initiator benzoyl peroxide is dropwise added, the dropwise adding time of the initiator is 1h, the temperature is raised to 65-70 ℃ after the dropwise adding of the initiator is completed, then 0.4 part of second cross-linking agent bismaleimide polyethylene glycol (MAL-PEG-MAL) is added, the temperature is kept for 3.5h, the organic solvent is removed after the reaction is finished by vacuum drying, and the white powdery product is obtained.
Comparative example 2
In this comparative example, compared with example 1, the second crosslinking agent MAL-PEG-MAL was not added, and the preparation steps were as follows:
100 parts of acrylic acid, 5 parts of (methyl) dodecyl acrylate hydrophobic monomer, 0.2 part of first cross-linking agent triallyl isocyanurate and 400 parts of mixed solvent of cyclohexane and ethyl acetate are added into a reactor according to parts by weight, the temperature is raised to 55-60 ℃ under the protection of nitrogen, then ethyl acetate solution containing 0.05 part of initiator benzoyl peroxide is dropwise added, the dropwise adding time of the initiator is 1h, the temperature is raised to 65-70 ℃ after the dropwise adding of the initiator is completed, the heat preservation reaction is continued for 3.5h, and the organic solvent is removed by vacuum drying after the reaction is completed, so that a white powdery product is obtained.
The acrylic acid thickeners obtained in the above examples and comparative examples were subjected to performance test by adding the acrylic acid thickener to sodium hydroxide solution to prepare a viscous gel system having a mass concentration of 0.5% and a pH of 7, and recording the time (25 ℃) for the acrylic acid thickener to completely disperse and swell to no white spots. The viscosity (Brookfield DV-II viscometer, 20rpm, 25 ℃ C.; mPa.s) and light transmittance (ultraviolet-visible spectrophotometer;%) were then tested. The smoothness test method is to visually observe the surface smoothness of the viscous gel system. The test results are shown in table 1 below.
TABLE 1
As can be seen from the results in Table 1, the present invention adopts triallyl isocyanurate of a specific structure as the first crosslinking agent compared with comparative example 1, and can significantly improve the transparency and dispersibility of the polyacrylic acid neutralization gel compared with the conventional pentaerythritol triallyl ether crosslinking agent. Compared with comparative example 2, the invention can further enhance the adhesiveness and transparency of the hydrogel and improve the smoothness and fineness of the neutralization gel by adding the second crosslinking agent MAL-PEG-MAL and matching the first crosslinking agent. Is very suitable for the application in a thickening system or a suspension stabilizing system with higher requirements on transparency and smoothness and fineness of the appearance of the product.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (10)
1. The preparation method of the high-light-transmittance high-viscosity polyacrylic acid thickener is characterized by comprising the following preparation steps:
adding acrylic acid, a (methyl) acrylic acid alkyl ester hydrophobic monomer, a first cross-linking agent triallyl isocyanurate and an organic solvent into a reactor, heating to 55-65 ℃ under the protection of nitrogen, then dropwise adding an initiator solution, heating to 60-75 ℃ after the initiator is dropwise added, then adding a second cross-linking agent MAL-PEG-MAL for heat preservation reaction, and removing the organic solvent by vacuum drying after the reaction is finished to obtain the high-transmittance high-viscosity polyacrylic acid thickener.
2. The method for preparing a high light transmittance and high viscosity polyacrylic acid thickener according to claim 1, wherein the hydrophobic monomer of the (meth) acrylic acid alkyl ester is an acrylic acid alkyl ester or a methacrylic acid alkyl ester with 8-18 carbon atoms.
3. The method for preparing the high-transmittance high-viscosity polyacrylic acid thickener according to claim 1, wherein the addition amount of the (meth) acrylic acid alkyl ester hydrophobic monomer is 2-10% of the mass of acrylic acid.
4. The method for preparing a high light transmittance and high viscosity polyacrylic acid thickener according to claim 1, wherein the addition amount of the first crosslinking agent triallyl isocyanurate is 0.05-0.5% of the mass of acrylic acid.
5. The method for preparing the high-transmittance high-viscosity polyacrylic acid thickener according to claim 1, wherein the organic solvent is at least one of benzene, toluene, n-hexane, cyclohexane and ethyl acetate; the initiator is at least one of azodiisobutyronitrile, azodiisoheptonitrile, dimethyl azodiisobutyrate, benzoyl peroxide, lauroyl peroxide and diisopropyl peroxydicarbonate.
6. The method for preparing the high-transmittance high-viscosity polyacrylic acid thickener according to claim 5, wherein the addition amount of the initiator is 0.01-0.2% of the mass of acrylic acid; the drop time of the initiator solution is 0.5-3 h.
7. The method for preparing the high-transmittance and high-viscosity polyacrylic acid thickener according to claim 1, wherein the molecular weight of the second crosslinking agent MAL-PEG-MAL is 2000-20000.
8. The method for preparing a high light transmittance and high viscosity polyacrylic acid thickener according to claim 7, wherein the addition amount of the second crosslinking agent MAL-PEG-MAL is 0.1 to 1% of the mass of acrylic acid.
9. The method for preparing the high-transmittance high-viscosity polyacrylic acid thickener according to claim 1, wherein the time of the heat preservation reaction is 1-4 hours.
10. A high light transmittance high viscosity polyacrylic acid thickener prepared by the method of any one of claims 1 to 9.
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