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Method for preparing dispersing agent for coating by naphthalenesulfonate wastewater

A naphthalene sulfonate and dispersant technology, applied in powder coatings, coatings, etc., can solve the problems of lipophilic groups without carbon chain length and poor bonding, and achieve simple preparation methods, good solubility and bonding sexual effect

Active Publication Date: 2016-02-10
嘉兴泰格高新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: the hydrophilic groups of coating dispersants currently on the market are not firmly bonded to the surface of particles with low polarity or non-polarity, and the lipophilic groups do not have sufficient carbon chain length, so they cannot Disadvantages of sufficient steric hindrance effects in the aqueous dispersion system provide a method to remove impurities by filtering naphthalene sulfonate wastewater, and then mix it with methylene succinic acid and return it to remove dissolved impurities in wastewater , then react it with ethyl acetate and other substances under the action of a palladium catalyst to prepare a coarse paint dispersant, then adjust the pH, add a surfactant and mix evenly, and prepare a method for a paint dispersant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] First get 900mL naphthalenesulfonate waste water and put it into a centrifuge, carry out centrifugation, get the supernatant, put the supernatant of gained in the container, use the sodium hydroxide solution that the mass fraction is 68% to adjust the pH to 7.5, then add 600mL of ethylene glycol to it, stir evenly, and stand still for 10min; then put the mixed solution in the above container into an Erlenmeyer flask with a thermometer, a stirrer and a spherical condenser, and then add 10g of zeolite therein, Set the rotation speed at 160r / min, the temperature at 110°C, and after refluxing for 40min, cool down to 60°C, then drop 300mL of methylene succinic acid into the container with a burette at a rate of 10d / min; After the addition is completed, cool down to 40°C, stop stirring, and after standing still for 35 minutes, filter under reduced pressure while hot, collect the filtrate, put the obtained filtrate into the reaction kettle, add 120g of potassium persulfate to i...

example 2

[0020]First get 1050mL naphthalene sulfonate waste water and put into centrifuge, carry out centrifugation, get supernatant, the supernatant of gained is put into container, use the sodium hydroxide solution that massfraction is 68% to adjust pH to 7.8, then add 700mL ethylene glycol to it, stir evenly, and stand still for 13min; then put the mixed solution in the above container into an Erlenmeyer flask with a thermometer, a stirrer and a spherical condenser, and then add 13g zeolite therein, Set the rotation speed at 170r / min, the temperature at 130°C, and after refluxing for 55 minutes, cool down to 65°C, then use a burette to drop 350mL of methylene succinic acid into the container at a rate of 15d / min; After the addition is completed, lower the temperature to 45°C, stop stirring, and after standing still for 40 minutes, filter under reduced pressure while hot, collect the filtrate, put the obtained filtrate into the reaction kettle, add 135g of potassium persulfate to it, ...

example 3

[0023] First get 1200mL naphthalene sulfonate waste water and put into centrifuge, carry out centrifugation, get supernatant, the supernatant of gained is put into container, use the sodium hydroxide solution that massfraction is 68% to adjust pH to 8.0, then add 800mL ethylene glycol therein, stir evenly, stand still for 15min; then put the mixed solution in the above-mentioned container in the Erlenmeyer flask with thermometer, stirrer and spherical condenser, add 15g zeolite therein again, Set the rotation speed at 180r / min, the temperature at 150°C, and after reflux for 70min, cool down to 70°C, then use a burette to drop 400mL of methylene succinic acid into the container at a rate of 20d / min; After the addition is completed, lower the temperature to 50°C, stop stirring, and after standing still for 45 minutes, filter under reduced pressure while hot, collect the filtrate, put the obtained filtrate into the reaction kettle, add 150g of potassium persulfate to it, stir even...

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Abstract

The invention discloses a method for preparing a dispersing agent for a coating by naphthalenesulfonate wastewater, and belongs to the field of preparation of dispersing agents for coatings. The method comprises the following steps: filtering the naphthalenesulfonate wastewater to remove impurities, mixing and refluxing with itaconic acid, and removing dissolved impurities in the wastewater; reacting with the substances of acetic ether and the like under the action of a palladium catalyst to prepare a coarse dispersing agent for the coating; and adding a surfactant to mix evenly through pH adjustment, so as to prepare the dispersing agent for the coating. The method has the beneficial effects that the preparation method is simple; a hydrophilic group of the obtained dispersing agent for the coating is firmly combined on the particle surface with relatively low polarity or non-polarity; and a lipophilic group has enough carbon chain length, can generate an enough steric-hinerance effect in a water-based dispersion system, and has good solubility and associativity in water.

Description

technical field [0001] The invention relates to a method for preparing a paint dispersant by using naphthalene sulfonate wastewater, and belongs to the field of paint dispersant preparation. Background technique [0002] A dispersant is a surfactant that has two opposite properties of lipophilicity and hydrophilicity in the molecule. It can uniformly disperse the solid and liquid particles of inorganic and organic pigments that are difficult to dissolve in liquid, and at the same time prevent the particles from settling and agglomerating, forming an amphiphilic agent required for a stable suspension. One end is a hydrophilic group, and the other end is a hydrophobic group; the hydrophilic group is often a polar group, such as carboxylic acid, sulfonic acid, sulfuric acid, amino or amine groups and salts, and the hydrophobic group is often Non-polar hydrocarbon chains, such as hydrocarbon chains with more than 8 carbon atoms. Surfactants are classified into ionic surfactant...

Claims

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Application Information

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IPC IPC(8): C09D7/12C09D5/03C08F120/06
Inventor 仇颖超盛艳花宋国
Owner 嘉兴泰格高新材料股份有限公司
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