Process for synthesizing polymer type poly carboxylic acid

A technology of polycarboxylic acid and synthesis method, which is applied in the field of synthesizing polymeric polycarboxylic acid by aqueous phase polymerization process, which can solve the problems of restricting the industrial application of BTCA, gap in finishing effect, poor washability, etc., and achieve clean and pollution-free production process, taking into account Cost and use effect, avoiding the effect of poor finishing effect

Inactive Publication Date: 2005-06-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1,2,3,4-butanetetracarboxylic acid (BTCA) is recognized as the most effective polycarboxylic acid anti-wrinkle finishing agent. The non-ironing performance of the finished fabric is similar to that of the 2D resin-finished fabric, and the former's finish is similar to that of the 2D resin treated fabric. The mechanical properties are better than the latter; however, the price of BTCA as a finishing agent is much higher than that of 2D resins, and economic reasons limit the industrial application of BTCA
[0005] Citric acid (CA) has the advantages of wide sources and low price. It was once considered a substitute for BTCA, but practice shows that CA, as a finishing agent, produces less ester crosslinks, lower crosslinking degrees, and lower wrinkle recovery angles. The improvement is less, the washability is poor, and there is still a big gap between the finishing effect and 2D resin, and the fabric is prone to yellowing after finishing
[0006] Propane tricarboxylic acid, 1,2,4,5-benzene tetracarboxylic acid, 1,2,3,4,5,6-cyclohexane hexacarboxylic acid, cyclopentane tetracarboxylic acid and more than 20 kinds of polycarboxylates Acids have been extensively studied, but their finishing effect is still far behind that of 2D resins

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/40C08F20/06C08F22/02
Inventor 钟振声薛万博
Owner SOUTH CHINA UNIV OF TECH
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