Synthesis method of modified acrylic acid-acrylamide copolymer builder

A technology of acrylamide copolymerization and acrylic acid copolymer, which is applied in detergent compounding agents, chemical instruments and methods, detergent compositions, etc., can solve problems such as expensive initiators, toxic and harmful solvents, and influence on builder performance, and achieve Reduce the cost of traditional production, reduce the harm of environmental pollution, and have excellent washing performance

Inactive Publication Date: 2020-07-31
SHANGHAI DONGSHENG NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the initiator is expensive and used in large quantities; the solvent used in it is poisonous and harmful, and needs to be recycled after distillation, so the process is complicated and the investment in equipment is large, and the time used is long and the energy consumption is high. higher cost
In addition, without pre-neutralizing acrylic acid, the solution polymerization reaction of directly adding acrylic acid dropwise, this production process (such as patent CN101921359A), the efficiency of grafting maleic anhydride to the copolymer is low, and the synthesized acrylic acid-maleic anhydride Copolymer products have poor dispersibility, which affects the builder performance

Method used

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  • Synthesis method of modified acrylic acid-acrylamide copolymer builder

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Effect test

Embodiment 1

[0024] First add 2kg of deionized water to the reactor, pass nitrogen, and when the temperature is raised to 70°C while stirring, simultaneously add dropwise 126kg of acrylic acid, 185kg of acrylamide 40% aqueous solution, 4kg of initiator potassium persulfate solution, and 4kg of sodium bisulfite solution. The reaction time is 2 hours; then take 10kg of copolymer, add 13kg of formaldehyde solution, 8kg of dimethylamine solution and 2kg of hydrochloric acid solution, and react for 3 hours at 70 degrees to obtain the modified polymer.

Embodiment 2

[0026] First add 2kg of deionized water to the reactor, pass nitrogen, and when the temperature is raised to 70°C while stirring, simultaneously add 126kg of acrylic acid, 185kg of acrylamide 40% aqueous solution, 4kg of initiator sodium persulfate solution, and 4kg of potassium bisulfite solution. The reaction time is 2.5 hours; take 10kg of copolymer, add 13kg of formaldehyde solution, 8kg of dimethylamine solution and 2kg of hydrochloric acid solution, and react for 3 hours at 70 degrees to obtain the modified polymer.

Embodiment 3

[0028] First add 2kg of deionized water to the reactor, pass nitrogen gas, and when the temperature rises to 80°C while stirring, add 126kg of acrylic acid, 185kg of acrylamide 40% aqueous solution, 4kg of initiator sodium persulfate solution, and 4kg of sodium metabisulfite solution dropwise at the same time. Take 10kg of copolymer, add 13kg of formaldehyde solution, 8kg of dimethylamine solution and 2kg of hydrochloric acid solution, and react for 3 hours at 65 degrees to obtain the modified polymer.

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Abstract

The invention discloses a synthesis method of a modified acrylic acid-acrylamide copolymer builder, which comprises the following steps: carrying out copolymerization on acrylic acid and acrylamide toobtain an acrylic acid-acrylamide copolymer, and adding formaldehyde and amine to carry out a Mannich reaction, thereby obtaining the modified acrylic acid-acrylamide copolymer builder. The copolymersynthesized by the method has a large number of positive ion and negative ion groups, so that the adsorption capacity of the surfaces of particles is improved. A large number of charged groups mutually generate electrostatic repulsion, so that the dirt particle dispersion capability is improved, and the detergency is greatly improved. The synthesized modified acrylic acid-acrylamide copolymer product is light in color and luster and excellent in washing assisting performance such as chelating force dispersion force, and can completely or partially replace sodium tripolyphosphate to be used ina detergent, so that the harm of the detergent to environmental pollution is reduced.

Description

technical field [0001] The invention relates to the field of builder preparation, in particular to a method for synthesizing a modified acrylic acid-acrylamide copolymer builder. Background technique [0002] Polycarboxylate polymers have excellent chelating and dispersing effects, and are widely used in the fields of detergents and water treatment. In the field of washing, they mainly have dispersing effects. When used as a detergent aid, it has the following characteristics: alkaline buffering effect, even if there is a small amount of acidic substances, due to the action of the aid, the pH of the washing liquid does not change significantly, and there is still a strong decontamination effect; it has the ability to make dirt Disperse in water and prevent dirt from reattaching and depositing on fabrics; polycarboxylate polymers have a large number of carboxylate groups on the side chains, so they have strong particle chelating ability and soften hard water ability. In view...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F8/32C11D3/37
CPCC08F8/32C08F220/56C11D3/3769C11D3/3773C08F220/06
Inventor 施晓旦王虎尹东华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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