Process for synthesizing polymer type poly carboxylic acid

Abstract

A process for synthesizing the polymerized multi-element carboxylic acid used as the anti-crease finishing agent of fabric includes such steps as proportionally dissolving maleic acid, itaconic acid and acrylic acid in water, stirring, introducing protective N2, slowly adding trigger while stirring for reacting at 45-95 deg.C for 1-5 hr, stirring for 1 hr, and adding ptlymerizing inhibitor.

Description

technical field

[0001] The invention relates to a method for synthesizing a polymeric polycarboxylic acid, in particular to a method for synthesizing a polymeric polycarboxylic acid by using an aqueous phase polymerization process by using maleic acid, itaconic acid and acrylic acid as polymerization monomers. Background technique

[0002] N-methylol amide resin type non-ironing finishing agent (such as 2D resin, etc.) has the advantages of low price and good finishing effect, and is widely used in the textile industry, but the fabrics finished by it will release during processing, storage and use. formaldehyde which is harmful to human body and environment. At present, more and more countries have imposed strict restrictions on the amount of formaldehyde released from textiles, and such finishing agents will be gradually banned or banned. Polycarboxylic acid itself does not contain formaldehyde and does not release formaldehyde during use. Its finishing effect can reach or...

Examples

Embodiment 1

[0022] The synthetic method of the present invention is as follows: 175.8kg deionized water, 58kg maleic acid, 52kg itaconic acid and 28.8kg acrylic acid are added successively in the reaction kettle with jacket heating device, stirred until completely dissolved, and nitrogen protection is passed into, The reaction temperature of the control device is 70°C. Slowly add 32.4kg of 30% ammonium persulfate aqueous solution to the system at a uniform speed within 1.5h, continue to stir at a constant temperature for 1h, take a sample for inspection, and add 207g of terephthalate to the system after the bromine value and viscosity are qualified. Phenol is cooled to obtain the final product. The mass fraction of polymerized polycarboxylic acid in the product is 40%, the bromine value is 56 mg / g, and the viscosity-average molecular weight is 853.

Embodiment 2

[0024] The synthetic method of the present invention is as follows: 341.8kg deionized water, 58kg maleic acid, 91kg itaconic acid and 144kg acrylic acid are successively added in the reactor with jacketed heating device, stirred until completely dissolved, fed into nitrogen protection, controlled The reaction temperature of the device is 95°C. Slowly add 97.7kg of 9% potassium persulfate aqueous solution to the system at a uniform speed within 2 hours, continue to stir at a constant temperature for 1 hour, take a sample for detection, and add 293g of hydroquinone to the system after the bromine value and viscosity are qualified. Cool down to get the final product. The product has a mass fraction of polymerized polycarboxylic acid of 40%, a bromine value of 39 mg / g, and a viscosity-average molecular weight of 884.

Embodiment 3

[0026] The synthetic method of the present invention is as follows: 225.6kg deionized water, 58kg maleic acid, 45.5kg itaconic acid and 108kg acrylic acid are added successively in the reaction kettle with jacketed heating device, stirred until completely dissolved, fed into nitrogen protection, The reaction temperature of the control device is 80°C. Slowly add 91.7kg of 30% ammonium persulfate aqueous solution to the system at a uniform speed within 3.5h, continue to stir at a constant temperature for 1h, take a sample for inspection, and add 221g of terephthalate to the system after the bromine value and viscosity are qualified. Phenol is cooled to obtain the final product. The mass fraction of polymerized polycarboxylic acid in the product is 40%, the bromine value is 45 mg / g, and the viscosity-average molecular weight is 865.

technical field

[0001] The invention relates to a method for synthesizing a polymeric polycarboxylic acid, in particular to a method for synthesizing a polymeric polycarboxylic acid by using an aqueous phase polymerization process by using maleic acid, itaconic acid and acrylic acid as polymerization monomers. Background technique

[0002] N-methylol amide resin type non-ironing finishing agent (such as 2D resin, etc.) has the advantages of low price and good finishing effect, and is widely used in the textile industry, but the fabrics finished by it will release during processing, storage and use. formaldehyde which is harmful to human body and environment. At present, more and more countries have imposed strict restrictions on the amount of formaldehyde released from textiles, and such finishing agents will be gradually banned or banned. Polycarboxylic acid itself does not contain formaldehyde and does not release formaldehyde during use. Its finishing effect can reach or...

Examples

Embodiment 1

[0022] The synthetic method of the present invention is as follows: 175.8kg deionized water, 58kg maleic acid, 52kg itaconic acid and 28.8kg acrylic acid are added successively in the reaction kettle with jacket heating device, stirred until completely dissolved, and nitrogen protection is passed into, The reaction temperature of the control device is 70°C. Slowly add 32.4kg of 30% ammonium persulfate aqueous solution to the system at a uniform speed within 1.5h, continue to stir at a constant temperature for 1h, take a sample for inspection, and add 207g of terephthalate to the system after the bromine value and viscosity are qualified. Phenol is cooled to obtain the final product. The mass fraction of polymerized polycarboxylic acid in the product is 40%, the bromine value is 56 mg / g, and the viscosity-average molecular weight is 853.

Embodiment 2

[0024] The synthetic method of the present invention is as follows: 341.8kg deionized water, 58kg maleic acid, 91kg itaconic acid and 144kg acrylic acid are successively added in the reactor with jacketed heating device, stirred until completely dissolved, fed into nitrogen protection, controlled The reaction temperature of the device is 95°C. Slowly add 97.7kg of 9% potassium persulfate aqueous solution to the system at a uniform speed within 2 hours, continue to stir at a constant temperature for 1 hour, take a sample for detection, and add 293g of hydroquinone to the system after the bromine value and viscosity are qualified. Cool down to get the final product. The product has a mass fraction of polymerized polycarboxylic acid of 40%, a bromine value of 39 mg / g, and a viscosity-average molecular weight of 884.

Embodiment 3

[0026] The synthetic method of the present invention is as follows: 225.6kg deionized water, 58kg maleic acid, 45.5kg itaconic acid and 108kg acrylic acid are added successively in the reaction kettle with jacketed heating device, stirred until completely dissolved, fed into nitrogen protection, The reaction temperature of the control device is 80°C. Slowly add 91.7kg of 30% ammonium persulfate aqueous solution to the system at a uniform speed within 3.5h, continue to stir at a constant temperature for 1h, take a sample for inspection, and add 221g of terephthalate to the system after the bromine value and viscosity are qualified. Phenol is cooled to obtain the final product. The mass fraction of polymerized polycarboxylic acid in the product is 40%, the bromine value is 45 mg / g, and the viscosity-average molecular weight is 865.