A bisphenol A derivative superdispersant and its preparation method

Abstract

This invention belongs to the field of polymer materials and fine chemical technology, specifically relating to a bisphenol A derivative superdispersant, whose hydrophobic portion consists of tetraacetyl or tetrabenzoyl bisphenol A. The preparation method involves Friedel-Crafts acylation of bisphenol A with acetyl chloride, benzoyl chloride, benzoic anhydride, or acetic anhydride, followed by alkoxylation with ethylene oxide. The bisphenol A derivative superdispersant of this invention exhibits hydrophobic, planar, and hydrogen bonding interactions with organic pigments and pesticide particles, resulting in emulsions with better emulsion stability and finer particle size. Pigment pastes prepared using this superdispersant have finer particle sizes, and pesticide emulsification exhibits better pouring performance and lower washing residue content.

Description

Technical Field

[0001] This invention belongs to the technical fields of coatings, water-based pigments, surfactants, and dispersants, and relates to a bisphenol A derivative nonionic superdispersant and its preparation method. Background Technology

[0002] Coatings are fine chemical products that are applied to the surface of an object using specific application methods and then cured to form a continuous protective film with a certain strength, or a coating film with a special function.

[0003] Coatings generally consist of film-forming substances, solvents, pigments, and additives. Film-forming substances, also known as binders, are the main substances that enable the coating to adhere firmly to the surface of the object being coated, forming a continuous thin film. Solvents are volatile components, mainly organic solvents and water. Pigments are insoluble fine particles dispersed in the paint, and can be divided into coloring pigments and extender pigments, primarily used for coloring, providing protection, decoration, and cost reduction. Additives constitute a small proportion of the coating formulation but play a crucial role. Additives have the most important effects on the storage, application, film formation, and durability of coatings. Common additives in coatings include: leveling agents, thickeners, surfactants, pigment dispersants, plasticizers, driers, curing agents, bactericides, and fungicides.

[0004] Pigment dispersants, also known as wetting and dispersing agents, are commonly classified into inorganic, surfactant, and polymeric types. Polymer dispersants are generally considered to be the most effective, hence they are often referred to as super-dispersants. Polymers include natural polymers, primarily used in solvent-based coatings; synthetic polymers include polycarboxylates, polyacrylates, polymethacrylates, maleic acid-isobutylene (or styrene) copolymer salts, polyvinylpyrrolidone, and polyether derivatives.

[0005] Using polyphenyl (or polyaryl) structures as hydrophobic groups to prepare surfactants (emulsifiers or dispersants) offers many advantages over common long-chain alkyl groups. Polyphenyl (or polyaryl) structures, as hydrophobic groups, possess good planarity and strong rigidity of the hydrophobic component, and are generally used for the dispersion and emulsification of raw materials (such as pesticides, pigments, and dyes) and materials (such as asphalt and epoxy resins) with high melting points and a high number of aromatic rings in their molecular structure. The hydrophobic polyphenyl (or polyaryl) group can utilize its good planarity to combine with the dispersed substance through hydrophobic interactions, π-π stacking, and other forces, and then disperse the dispersed substance in water through solvation chains (hydrophilic groups). Common surfactants (emulsifiers or dispersants) containing polyphenyl rings include Agricultural Emulsion 600 (Formula 1) and Agricultural Emulsion 700 (Formula 2), with the following structural formulas:

[0006] Equation 1 (where n is a natural number greater than 3).

[0007] Equation 2 (where m and n are natural numbers greater than 3). Patents WO2021173905, EP2826890, and CN112778948 all describe a method for preparing coating dispersants using bisphenol A derivatives. For example, patent CN112778948 mentions an alkyl or phenylalkyl-substituted bisphenol A as a hydrophobic superdispersant, and the structural formula of the bisphenol A derivative dispersant (Formula 3) mentioned is as follows:

[0008] Formula 3 (where R1, R2, R3, and R4 are alkyl or phenylalkyl substituents); However, although these bisphenol A-derived surfactants or dispersants increase the hydrophobic and planar interactions between the hydrophobic groups and the dispersed or emulsified substances, most pesticide, dye, and pigment particles are not completely hydrophobic. Their structures often contain a large number of polar functional groups such as amide, hydroxyl, ether, ester, urea, and carbamate groups. These polar groups usually cause strong hydrogen bonding, which is precisely what is lacking between bisphenol A surfactants and the dispersed substances. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a bisphenol A derivative superdispersant and its preparation method. The superdispersant of the present invention contains four carbonyl groups in the hydrophobic part. When used as a dispersant, in addition to hydrophobic interaction and planar stacking interaction with the dispersed substance, it also generates hydrogen bonding interaction, which ensures better anchoring between the dispersant and the dispersed substance and prevents emulsion destabilization during emulsification and dispersion.

[0010] To address the aforementioned technical problems, embodiments of the present invention provide a bisphenol A derivative superdispersant having the structure shown in formula (I): Formula (I); Where R is methyl or phenyl, and n is a natural number from 10 to 30.

[0011] This invention also provides a method for preparing a bisphenol A derivative superdispersant, comprising the following steps: S1. Dissolve bisphenol A in a solvent, add a reaction reagent under stirring to carry out Friedel-Crafts acylation reaction, and react at 135~220℃ for 2~8 hours to obtain tetraacetylated or tetrabenzoylated bisphenol A. S2: The tetraacetylated or tetrabenzoyl bisphenol A obtained in step S1 is placed in a high-pressure reactor, a catalyst is added, and ethylene oxide gas is introduced to carry out the reaction, thereby preparing a bisphenol A derivative superdispersant.

[0012] In step S1, the solvent is glacial acetic acid or anhydrous aluminum trichloride.

[0013] In step S1, the reaction reagent is acetic anhydride, benzoic anhydride, acetyl chloride, or benzoyl chloride.

[0014] In step S2, the catalyst is sodium hydroxide, potassium hydroxide, or boron trifluoride ether.

[0015] The beneficial effects of the above technical solution of the present invention are as follows: The carbonyl-containing bisphenol A superdispersant involved in this invention has the characteristics of simple preparation method, high dispersion efficiency for pesticides and pigments, and good stability. Detailed Implementation

[0016] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with specific embodiments.

[0017] As described in the background section above, existing bisphenol A-derived surfactants or dispersants typically rely solely on hydrophobic interactions and π-π stacking to adsorb onto pigment surfaces. For organic pigments or functional fillers containing polar functional groups (such as amide, urea, hydroxyl, and carboxyl groups), their anchoring ability is insufficient, leading to poor dispersion stability, easy coarsening, or sedimentation. To address these problems, this invention provides a bisphenol A derivative superdispersant with the structure shown in formula (I): Formula (I); Where R is methyl or phenyl, and n is a natural number from 10 to 30.

[0018] This invention also provides a method for preparing a bisphenol A derivative superdispersant, comprising the following steps: S1. Dissolve bisphenol A in a solvent, add a reaction reagent under stirring to carry out Friedel-Crafts acylation reaction, and react at 135~220℃ for 2~8 hours to obtain tetraacetylated or tetrabenzoylated bisphenol A. S2: The tetraacetylated or tetrabenzoyl bisphenol A obtained in step S1 is placed in a high-pressure reactor, a catalyst is added, and ethylene oxide gas is introduced to carry out the reaction, thereby preparing a bisphenol A derivative superdispersant.

[0019] In step S1, the solvent is glacial acetic acid or anhydrous aluminum trichloride.

[0020] In step S1, the reaction reagent is acetic anhydride, benzoic anhydride, acetyl chloride, or benzoyl chloride.

[0021] In step S2, the catalyst is sodium hydroxide, potassium hydroxide, or boron trifluoride ether.

[0022] The technical solution of the present invention will be further described below with reference to specific embodiments. Example 1

[0023] 1(a) Preparation of Tetrabenzoylbisphenol A 1000g of anhydrous aluminum trichloride was added to a 5000ml dry four-necked flask and heated to 220℃ to melt. While stirring, 460g of bisphenol A powder was quickly added. After the bisphenol A melted, 1200g of benzoyl chloride was added to the reaction system in three batches over 40 minutes. The reaction was then continued at 220℃ with stirring for 2 hours. The reaction system was cooled to 80℃, and 1000ml (80℃, 20% concentration) of sodium hydroxide solution was added. The mixture was kept at 80℃ for 4 hours. After cooling to room temperature, the solution in the four-necked flask was poured out, and 2000ml of 10% sodium hydroxide solution was added for dilution. After stirring at room temperature for 2 hours, the mixture was filtered. The filter cake was first washed with 5% dilute hydrochloric acid solution, then washed with deionized water until neutral. After drying, 1200g of white solid product was obtained, with a yield of 93%.

[0024] 1(b) Preparation of Tetrabenzoyl Bisphenol A Polyoxyethylene Ether Superdispersant In a reaction vessel, 1000g of tetrabenzoylbisphenol A prepared in step 1(a) and 20g of anhydrous KOH tablets were added. Nitrogen gas was gradually introduced while stirring to displace the air in the reaction vessel. After the pressure stabilized, 1400g of ethylene oxide was introduced until the reaction system pressure reached 0.5MPa. During the reaction, the pressure of the reaction system gradually decreased as the ethylene oxide was consumed. Nitrogen gas was continuously introduced to maintain the reaction pressure at 0.5MPa until the reaction pressure stabilized and no longer decreased, indicating that the ethylene oxide reaction was complete. Acetic acid was added to adjust the pH of the reaction system to a weak acid (pH=6). After adding diatomaceous earth adsorbent, the mixture was filtered and dehydrated to obtain superdispersant 1#. Its structural formula is as follows: . Example 2

[0025] 2(a) Preparation of Tetrabenzoyl Bisphenol A Add 300g of anhydrous aluminum trichloride to a 2500ml dry four-necked flask and heat to 220℃ to melt. While stirring, quickly add 220g of bisphenol A powder. After the bisphenol A melts, add 600g of benzoyl chloride in three batches to the reaction system at once, completing the addition within 40 minutes. Continue stirring at 220℃ for 2 hours. Cool the reaction system to 80℃ and add 300ml (80℃, 20% concentration) of sodium hydroxide solution. Incubate at 80℃ for 4 hours. Cool to room temperature, pour out the solution from the four-necked flask, and dilute with 500ml of 10% sodium hydroxide solution. Stir at room temperature for 2 hours and filter. Wash the filter cake first with 5% dilute hydrochloric acid solution, then wash with deionized water until neutral. After drying, obtain 575g of white solid product, yield 92.6%.

[0026] 2(b) Preparation of Tetrabenzoyl Bisphenol A Polyoxyethylene Ether Superdispersant In a reaction vessel, 570 g of tetrabenzoylbisphenol A prepared in step 2(a) and 10 g of anhydrous NaOH tablets were added. Nitrogen gas was gradually introduced while stirring to displace the air in the reaction vessel. After the pressure stabilized, 1170 g of ethylene oxide was introduced until the reaction system pressure reached 0.5 MPa. During the reaction, as the ethylene oxide was consumed, the pressure of the reaction system gradually decreased. Nitrogen gas was introduced to maintain the reaction pressure at 0.5 MPa until the reaction pressure stabilized and no longer decreased, indicating that the ethylene oxide reaction was complete. Acetic acid was added to adjust the pH of the reaction system to a weak acid (pH=6). After adding diatomaceous earth adsorbent, the mixture was filtered and dehydrated to obtain superdispersant 2#. Its structural formula is as follows: . Example 3

[0027] 3(a) Preparation of Tetrabenzoyl Bisphenol A 500g of glacial acetic acid was added to a 5000ml metal reactor. While stirring, 220g of bisphenol A powder was rapidly added, and the bisphenol A was dispersed by slurry mixing. 600g of benzoyl chloride was then added to the reaction system. After the addition was complete, the reactor was sealed and heated to 180℃, and stirring was maintained for 6 hours. After 6 hours, the reaction system was cooled to 80℃, and 500ml of sodium hydroxide solution (80℃, 20% concentration) was added. The mixture was kept at 80℃ for 4 hours. After cooling to room temperature, the solution in the four-necked flask was poured out, and then 500ml of 10% sodium hydroxide solution was added for dilution. After stirring at room temperature for 2 hours, the mixture was filtered. The filter cake was first washed with 5% dilute hydrochloric acid solution, then washed with deionized water until neutral. After drying, 552g of a white solid product was obtained, with a yield of 88.9%.

[0028] 3(b) Preparation of Tetrabenzoyl Bisphenol A Polyoxyethylene Ether Superdispersant In a reaction vessel, 570 g of tetrabenzoylbisphenol A prepared in step 3(a) and 13 g of boron trifluoride diethyl ether were added. Nitrogen gas was gradually introduced while stirring to displace the air in the reaction vessel. After the pressure stabilized, 1560 g of ethylene oxide was introduced until the reaction system pressure reached 0.5 MPa. During the reaction, as the ethylene oxide was consumed, the pressure of the reaction system gradually decreased. Nitrogen gas was introduced to maintain the reaction pressure at 0.5 MPa until the pressure stabilized and no longer decreased, indicating that the ethylene oxide reaction was complete. Acetic acid was added to adjust the pH of the reaction system to a weak acid (pH=6). After adding diatomaceous earth adsorbent, the mixture was filtered and dehydrated to obtain superdispersant 3#. Its structural formula is as follows: . Example 4

[0029] 4(a) Preparation of Tetrabenzoyl Bisphenol A 1000g of anhydrous aluminum trichloride was added to a 5000ml dry four-necked flask and heated to 220℃ to melt. While stirring, 460g of bisphenol A powder was quickly added. After the bisphenol A melted, 1900g of benzoic anhydride was added to the reaction system in three batches over 40 minutes. The reaction was then continued at 220℃ with stirring for 3 hours. The reaction system was cooled to 80℃, and 1000ml (80℃, 30% concentration) of sodium hydroxide solution was added. The mixture was kept at 80℃ for 4 hours. After cooling to room temperature, the solution in the four-necked flask was poured out, and 2000ml of 20% sodium hydroxide solution was added for dilution. After stirring at room temperature for 2 hours, the mixture was filtered. The filter cake was first washed with 5% dilute hydrochloric acid solution, then washed with deionized water until neutral. After drying, 1160g of a white solid product was obtained, with a yield of 91%.

[0030] 4(b) Preparation of Tetrabenzoyl Bisphenol A Polyoxyethylene Ether Superdispersant In a reaction vessel, 1000g of tetrabenzoylbisphenol A prepared in step 4(a) and 20g of anhydrous KOH tablets were added. Nitrogen gas was gradually introduced while stirring to displace the air in the reaction vessel. After the pressure stabilized, 780g of ethylene oxide was introduced until the reaction system pressure reached 0.5MPa. During the reaction, the pressure of the reaction system gradually decreased as the ethylene oxide was consumed. Nitrogen gas was continuously introduced to maintain the reaction pressure at 0.5MPa until the reaction pressure stabilized and no longer decreased, indicating that the ethylene oxide reaction was complete. Acetic acid was added to adjust the pH of the reaction system to a weak acid (pH=6). After adding diatomaceous earth adsorbent, the mixture was filtered and dehydrated to obtain superdispersant 4#. Its structural formula is as follows: . Example 5

[0031] 5(a) Preparation of tetraacetylbisphenol A Add 500g of glacial acetic acid to a 5000ml metal reactor, and while stirring, quickly add 220g of bisphenol A powder, dispersing the bisphenol A by slurry. Add 330g of acetyl chloride to the reaction system. After the addition is complete, seal the reactor and heat to 160℃, continuing stirring for 5 hours. After 5 hours, cool the reaction system to 80℃, add 500ml (80℃, 25% concentration) of sodium hydroxide solution, and soak at 80℃ for 4 hours. Cool to room temperature, pour out the solution from the four-necked flask, add another 500ml of 15% sodium hydroxide solution to dilute, stir at room temperature for 2 hours, and filter. Wash the filter cake first with 5% dilute hydrochloric acid solution, then wash with deionized water until neutral, and dry to obtain 361g of white solid product, yield 94.5%.

[0032] 5(b) Preparation of tetraacetylbisphenol A polyoxyethylene ether superdispersant In a reaction vessel, 360g of tetraacetylbisphenol A prepared in step 5(a) and 18.5g of anhydrous NaOH tablets were added. Nitrogen gas was gradually introduced while stirring to displace the air in the reaction vessel. After the pressure stabilized, 800g of ethylene oxide was introduced until the reaction system pressure reached 0.5MPa. During the reaction, the pressure of the reaction system gradually decreased as the ethylene oxide was consumed. Nitrogen gas was continuously introduced to maintain the reaction pressure at 0.5MPa until the reaction pressure stabilized and no longer decreased, indicating that the ethylene oxide reaction was complete. Acetic acid was added to adjust the pH of the reaction system to a weak acid (pH=6). After adding diatomaceous earth adsorbent, the mixture was filtered and dehydrated to obtain the superdispersant 5#. Its structural formula is as follows: . Example 6

[0033] 6(a) Preparation of Tetraacetylbisphenol A 1000g of glacial acetic acid was added to a 5000ml metal reactor. While stirring, 450g of bisphenol A powder was rapidly added, and the bisphenol A was dispersed by slurry mixing. 620g of acetyl chloride was added to the reaction system. After the addition was complete, the reactor was sealed and heated to 160℃, and stirring was maintained for 8 hours. After 8 hours, the reaction system was cooled to 80℃, and 1500ml of sodium hydroxide solution (80℃, 20% concentration) was added. The mixture was kept at 80℃ for 5 hours. After cooling to room temperature, the solution in the four-necked flask was poured out, and 1000ml of 10% sodium hydroxide solution was added for dilution. After stirring at room temperature for 2 hours, the mixture was filtered and dried to obtain 712g of a white solid product, with a yield of 91.2%.

[0034] 6(b) Preparation of Tetraacetylbisphenol A Polyoxyethylene Ether Superdispersant In a reaction vessel, 360 g of tetraacetylbisphenol A prepared in step 5(a) and 18.5 g of anhydrous NaOH tablets were added. Nitrogen gas was gradually introduced while stirring to displace the air in the reaction vessel. After the pressure stabilized, 1170 g of ethylene oxide was introduced until the reaction system pressure reached 0.5 MPa. During the reaction, the pressure of the reaction system gradually decreased as the ethylene oxide was consumed. Nitrogen gas was continuously introduced to maintain the reaction pressure at 0.5 MPa until the reaction pressure stabilized and no longer decreased, indicating that the ethylene oxide reaction was complete. Acetic acid was added to adjust the pH of the reaction system to a weak acid (pH=6). After adding diatomaceous earth adsorbent, the mixture was filtered and dehydrated to obtain superdispersant 6#. Its structural formula is as follows: . Example 7

[0035] 7(a) Preparation of Tetraacetylbisphenol A 1000g of glacial acetic acid was added to a 5000ml metal reactor. While stirring, 450g of bisphenol A powder was rapidly added, and the bisphenol A was dispersed by slurry mixing. 885g of acetic anhydride was added to the reaction system. After the addition was complete, the reactor was sealed and heated to 135℃, and stirring was maintained for 8 hours. After 8 hours, the reaction system was cooled to 80℃, and 1500ml of sodium hydroxide solution (80℃, 30% concentration) was added. The mixture was kept at 80℃ for 5 hours. After cooling to room temperature, the solution in the four-necked flask was poured out, and 1000ml of 20% sodium hydroxide solution was added for dilution. After stirring at room temperature for 2 hours, the mixture was filtered. The filter cake was first washed with 5% dilute hydrochloric acid solution, then washed with deionized water until neutral. After drying, 705g of a white solid product was obtained, with a yield of 90.2%.

[0036] 7(b) Preparation of Tetraacetylbisphenol A Polyoxyethylene Ether Superdispersant In a reaction vessel, 360 g of tetraacetylbisphenol A prepared in step 5(a) and 18.5 g of anhydrous NaOH tablets were added. Nitrogen gas was gradually introduced while stirring to displace the air in the reaction vessel. After the pressure stabilized, 1560 g of ethylene oxide was introduced until the reaction system pressure reached 0.5 MPa. During the reaction, the pressure of the reaction system gradually decreased as the ethylene oxide was consumed. Nitrogen gas was continuously introduced to maintain the reaction pressure at 0.5 MPa until the reaction pressure stabilized and no longer decreased, indicating that the ethylene oxide reaction was complete. Acetic acid was added to adjust the pH of the reaction system to a weak acid (pH=6). After adding diatomaceous earth adsorbent, the mixture was filtered and dehydrated to obtain superdispersant 7#. Its structural formula is as follows: .

[0037] Performance testing

[0038] (1) Testing of pigment dispersion performance Take 35g each of Pigment Red 57:1, Pigment Red 177, Pigment Red 140, Phthalocyanine Blue 15:3, Pigment Yellow 204, and Pigment Yellow 12 (all organic pigments are produced by Jiangsu Liwang Technology Co., Ltd.) and 10g of the dispersant prepared in the example into a glass bottle. Add 100g of glass beads (particle size 2-3mm), 0.1g of defoamer BYK-024 (BYK Corporation), and 55g of deionized water. Tighten the glass bottle and place it in an SK450 vibratory mixer (Shanghai Jingxin Industrial Co., Ltd.) and vibrate for 3 hours. Then remove the glass bottle and let it stand for 48 hours.

[0039] The particle size of the pigment emulsion was measured using a Mastersizer 3000 laser particle size analyzer from the pigment emulsion in the glass bottle after it had settled, and the results are shown in Table 1.

[0040] Table 1. Average particle size of colorants in pigment pastes (D) 50 (nm) ,

[0041] In this example, dispersant A and dispersant B are comparative examples. Dispersant A is tristyrene-phenol polyoxyethylene ether (15EO, produced by Haian Petrochemical), and dispersant B is polyoxyethylene ether (40EO, produced by Guangdong Wengjiang Chemical Reagent Co., Ltd.).

[0042] As shown in Table 1, compared with commercially available styrene-phenol polyoxyethylene ether and bisphenol A polyoxyethylene ether dispersants, the 1#-7# superdispersants in this embodiment have stronger emulsifying ability, and the particle size distribution of the prepared pigment pastes is all below 700 nm. In particular, the particle size of the pigment pastes prepared by superdispersants 4# and 7# is below 540 nm. This indicates that the 1#-7# dispersants have good dispersing performance.

[0043] After the emulsion has settled, 2 ml of pigment emulsion was taken from the upper layer of the glass bottle and placed in a petri dish. The petri dish was then dried in an oven at 100°C for 72 hours. The solid content of each sample after drying was calculated. A high solid content indicates good emulsion stability, while a lower solid content indicates more emulsion sedimentation and poor emulsion stability. The test results are shown in Table 2.

[0044] Table 2. Solid content of pigment / % (after standing for 72 hours, take the upper emulsion) , Among them, dispersant A and dispersant B are comparative examples. Dispersant A is tristyrene-phenol polyoxyethylene ether (15EO, produced by Haian Petrochemical), and dispersant B is polyoxyethylene ether (40EO, produced by Guangdong Wengjiang Chemical Reagent Co., Ltd.).

[0046] Table 2 shows that, apart from the commercial dispersants styrene-phenol polyoxyethylene ether and bisphenol A polyoxyethylene ether, the other dispersants 1#-7# all exhibited good dispersing performance, and the solid content of the prepared organic pigment emulsions was between 43% and 44.5% (theoretical solid content is 45%). This indicates that the emulsions prepared by dispersants 1#-7# have good stability, and the pigment particles are not prone to sedimentation in the emulsion.

[0047] (2) Testing of pesticide dispersion performance Prepare prochloraz pesticide emulsions according to Table 3 below. Test the stability of prochloraz pesticide emulsions according to GB / T 1603-2001 (Test Method for Stability of Pesticide Emulsions), and test the pouring performance of prochloraz pesticide emulsions according to GB / T 31737-2015 (Test Method for Pesticide Pourability). The test results are shown in Table 4 below.

[0048] Table 3. Formulation of prochloraz pesticide emulsion Imazalil 1 45 xylene 20 Dispersant 2 4 Xanthan Gum 0.04 Defoamer 3 0.2 Propylene glycol 8 Deionized water 22.76 Total weight 100 , Among them, 1. Imazalil technical grade, 97% purity, produced by Huifeng Agrochemical; 2. The dispersants are the super-dispersants in Examples 1-7, styrene-phenol polyoxyethylene ether (15EO, produced by Haian Petrochemical) and bisphenol A polyoxyethylene ether (40EO, produced by Guangdong Wengjiang Chemical Reagent Co., Ltd.); 3. The defoamer is DOWSIL™ 9511 produced by Dow Chemical Company.

[0049] Table 4. Stability of imazalil emulsions prepared with different emulsifiers 1 qualified 2.80 0.33 2 qualified 2.63 0.41 3 qualified 2.61 0.35 4 qualified 1.89 0.12 5 qualified 2.35 0.25 6 qualified 2.23 0.18 7 qualified 1.95 0.12 <![CDATA[Agricultural milk powder 600# * > qualified 3.62 0.26 <![CDATA[Agricultural milk 700# * > qualified 2.98 0.32 , Among them, Agricultural Milk 600# (produced by Haian Petrochemical); Agricultural Milk 700# (produced by Xingtai Xinlanxing Technology Co., Ltd.).

[0050] As shown in Table 4, the emulsion stability of the superdispersants prepared in this invention is qualified. However, in terms of pouring and washing residue, superdispersants 1#-7# are better than commercial pesticide emulsifiers.

[0051] In summary, the carbonyl-containing bisphenol A superdispersant involved in this invention has the characteristics of simple preparation method, high dispersion efficiency for pesticides and pigments, and good stability.

[0052] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A bisphenol A derivative superdispersant, characterized in that, It has the structure shown in equation (I): Equation (I); Where R is methyl or phenyl, and n is a natural number from 10 to 30.

2. A method for preparing a bisphenol A derivative superdispersant, characterized in that, Includes the following steps: S1. Dissolve bisphenol A in a solvent, add a reaction reagent under stirring to carry out Friedel-Crafts acylation reaction, and react at 135~220℃ for 2~8 hours to obtain tetraacetylated or tetrabenzoylated bisphenol A. S2: The tetraacetylated or tetrabenzoyl bisphenol A obtained in step S1 is placed in a high-pressure reactor, a catalyst is added, and ethylene oxide gas is introduced to carry out the reaction, thereby preparing a bisphenol A derivative superdispersant.

3. The method for preparing the bisphenol A derivative hyperdispersant according to claim 2, characterized in that, In step S1, the solvent is glacial acetic acid or anhydrous aluminum trichloride.

4. The method for preparing the bisphenol A derivative superdispersant according to claim 2, characterized in that, In step S1, the reaction reagent is acetic anhydride, benzoic anhydride, acetyl chloride, or benzoyl chloride.

5. The method for preparing the bisphenol A derivative hyperdispersant according to claim 2, characterized in that, In step S2, the catalyst is sodium hydroxide, potassium hydroxide, or boron trifluoride ether.

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