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Maleic anhydride-acrylic acid copolymer for washing agent and preparation method thereof

A technology of acrylic acid copolymer and maleic anhydride, which is used in soap detergents and other compounding agents, organic cleaning compositions, cleaning compositions containing organic compounds, etc. performance and other issues, to achieve the effect of satisfying processability and application range, reducing the harm of environmental pollution, and excellent builder performance

Inactive Publication Date: 2016-05-11
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • 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 maleic anhydride grafting on the copolymer is low, and the synthesized maleic anhydride-acrylic acid Copolymer products have poor dispersibility, which affects the builder performance

Method used

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  • Maleic anhydride-acrylic acid copolymer for washing agent and preparation method thereof
  • Maleic anhydride-acrylic acid copolymer for washing agent and preparation method thereof
  • Maleic anhydride-acrylic acid copolymer for washing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] First add 2kg of deionized water, 6kg of maleic anhydride and 6kg of initiator potassium bisulfite into the reactor, heat up to 70°C while stirring, and dropwise add acrylic acid sodium salt (126kg of acrylic acid monomer is reacted with 185kg of sodium hydroxide solution Neutralized to neutral to obtain), 4kg initiator potassium persulfate, the reaction time was 2 hours; after the dropwise addition was completed, the constant temperature was reacted for 3 hours; after the reaction was completed, it was neutralized to neutral with 125kg sodium hydroxide solution.

Embodiment 2

[0037] First add 2.5kg of deionized water, 8kg of maleic anhydride and 6kg of initiator ascorbic acid into the reactor, and heat up to 80°C while stirring. to neutrality), 5kg initiator sodium persulfate, and the reaction time was 2 hours; after the dropwise addition was completed, the constant temperature was reacted for 3 hours; after the reaction was completed, it was neutralized to neutral with 125kg potassium hydroxide solution.

Embodiment 3

[0039] First add 3kg of deionized water, 6kg of maleic anhydride and 6kg of initiator potassium bisulfite into the reactor, heat up to 80°C while stirring, and dropwise add acrylic acid sodium salt (126kg of acrylic acid monomer is reacted with 180kg of sodium hydroxide solution Neutralized to neutral to obtain), 4kg initiator potassium persulfate, the reaction time was 2.5 hours; after the dropwise addition was completed, the constant temperature was reacted for 2 hours; after the reaction was completed, 130kg of sodium hydroxide solution was used to neutralize to neutrality.

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Abstract

The invention provides a maleic anhydride-acrylic acid copolymer for a washing agent and a preparation method thereof. The preparation method comprises the following steps: mixing water, maleic anhydride, acrylic acid monomer and an initiator, carrying out heating to 70 to 100 DEG C and then carrying out a reaction; carrying out a constant-temperature reaction for at least 1 h; and carrying out cooling to less than 60 DEG C, neutralizing the cooled mixture with aqueous alkali and collecting a polymerization product. According to the invention, a unique synthesis process is employed; acrylic acid is neutralized to a pH value of 7.0 before the reaction, so the grafting rate of maleic anhydride can be greatly increased; the preparation method has the advantages of a high conversion rate, small investment for equipment, high product purity, no discharge of waste water and exhaust gas and environment friendliness; and compared with a commercially available product, the synthesized copolymer product has substantially improved wash assisting properties like chelating force and dispersion forces and can completely or partially replace sodium tripolyphosphate for usage in the washing agent.

Description

technical field [0001] The invention relates to a maleic anhydride-acrylic acid copolymer for detergent and a preparation method thereof. Background technique [0002] Phosphates (such as tripolyphosphate) and aluminum salts (such as sodium aluminosilicate, 4A zeolite, kaolin, bentonite aluminum sulfate) are usually used as builders in synthetic detergents, and phosphates are used as builders. After washing wastewater is discharged into lakes and rivers, algae and aquatic plants will multiply abnormally and die soon, resulting in water pollution and oxygen deficiency, and polluting the environment. [0003] Using polycarboxylate polymers as builders, it was found that polycarboxylate polymers have excellent chelating and dispersing effects, and are widely used in the fields of detergents and water treatment. Polycarboxylic acid polymers have the following characteristics as washing aids: alkaline buffering effect, even if there is a small amount of acidic substances, the pH...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F222/06C08F2/10C11D3/37C11D7/26C11D9/26
Inventor 王虎
Owner SHANGHAI DONGSHENG NEW MATERIALS