Ultralow molecular weight polyacrylic acid as well as preparation method and application thereof

A polyacrylic acid, molecular weight technology, applied in chemical instruments and methods, textiles and papermaking, descaling and water softening, etc., can solve problems such as a large number of organic solvents, and achieve the effect of improving tear strength, simple steps and convenient operation.

Pending Publication Date: 2022-07-08
JIAHUA CHEM TECH DEV SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved in the present invention is to overcome defects such as the preparation of ultra-low molecular weight polyacrylic acid in the prior art that requires a large amount of organic solvents and initiators, or requires special devices, or requires noble metal catalysts, thereby providing an ultra-low molecular weight polyacrylic acid. Molecular weight polyacrylic acid and its preparation method and application

Method used

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  • Ultralow molecular weight polyacrylic acid as well as preparation method and application thereof
  • Ultralow molecular weight polyacrylic acid as well as preparation method and application thereof
  • Ultralow molecular weight polyacrylic acid as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method of ultra-low molecular weight polyacrylic acid, the operations are as follows:

[0039] Weigh 360 g of deionized water and place it in the reactor, stir at 100 rpm to dissolve it completely, turn on the heating, and carry out nitrogen protection. Weigh 300 g of acrylic acid, 20 g of ammonium persulfate, and 200 g of deionized water into a 1 L beaker, stir to dissolve it completely and evenly for later use, marked as liquid A. Weigh 0.2 g of p-hydroxyanisole and dissolve it in 100 g of deionized water for use, which is marked as liquid B.

[0040] When the temperature of the solution in the reaction kettle rose to 72° C., one-eighth of the A solution was added dropwise, and the dropwise addition time was 10 minutes, and the reaction was incubated for 10 minutes. Add one-eighth of the B solution, the dropwise addition time is 15s, and the reaction is incubated for 5min. Then restart the dropwise addition of one-eighth of the A solution, the dropwise...

Embodiment 2

[0044] A preparation method of ultra-low molecular weight polyacrylic acid, the operations are as follows:

[0045] Weigh 240 g of deionized water and place it in the reactor, stir at 150 rpm to dissolve it completely, turn on the heating, and carry out nitrogen protection. Weigh 350 g of acrylic acid, 30 g of potassium persulfate, and 220 g of deionized water into a 1 L beaker, stir to dissolve it completely and evenly for use, and mark it as liquid A. Weigh 0.2 g of p-hydroxyanisole and 0.3 g of 1,1-diphenyl-2-trinitrophenylhydrazine and dissolve them in 100 g of deionized water for use, which is marked as liquid B.

[0046]When the temperature of the solution in the reaction kettle rises to 70°C, one-tenth of the A solution is added dropwise. The dropwise addition time is 12 minutes, and the reaction is incubated for 5 minutes. One-tenth of the B solution was added, the dropwise addition time was 30s, and the reaction was incubated for 10min. Then repeat the above steps, ...

Embodiment 3

[0049] A preparation method of ultra-low molecular weight polyacrylic acid, the operations are as follows:

[0050] Weigh 620 g of deionized water and place it in the reactor, stir at 50 rpm to dissolve it completely, turn on the heating, and carry out nitrogen protection. Weigh 150 g of acrylic acid, 10 g of potassium persulfate, and 100 g of deionized water into a 1 L beaker, stir to dissolve it completely and evenly for use, and mark it as liquid A. Weigh 0.06 g of p-hydroxyanisole and 0.05 g of 1,1-diphenyl-2-trinitrophenylhydrazine and dissolve them in 100 g of deionized water for use, which is marked as liquid B.

[0051] When the temperature of the solution in the reaction kettle rose to 80°C, a quarter of the A solution was added dropwise, and the dropwise addition time was 15 minutes, and the reaction was incubated for 5 minutes. A quarter of liquid B was added, the dropwise addition time was 40s, and the reaction was incubated for 8min. Then repeat the above steps,...

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Abstract

The invention belongs to the technical field of polymer preparation, and particularly relates to ultralow molecular weight polyacrylic acid as well as a preparation method and application thereof. According to the preparation method of the ultralow-molecular-weight polyacrylic acid, the molecular weight of the product is directly controlled by using the polymerization inhibitor, and the ultralow-molecular-weight polyacrylic acid product is prepared by adding the initiator, the acrylic acid and the polymerization inhibitor into the reaction system in batches. The reaction process does not need to add a chain transfer agent, does not need a large amount of solvent and initiator, does not need a special device, does not need a noble metal catalyst, and is simple in steps, convenient to operate and easy to control. The applicant finds that the ultra-low molecular weight polyacrylic acid provided by the invention is adopted as the fabric finishing agent, a good non-ironing finishing effect is achieved, the whiteness is not influenced, the strength loss is small, and the crease recovery angle of the finished fabric can reach 280 degrees or above.

Description

technical field [0001] The invention belongs to the technical field of polymer preparation, and in particular relates to an ultra-low molecular weight polyacrylic acid and a preparation method and application thereof. Background technique [0002] Acrylic polymers are an important class of water-soluble polymer compounds, which are widely used. The use of polyacrylic acid (salt) is closely related to its molecular weight. High molecular weight sodium polyacrylate is mainly used as water absorbent, flocculant, etc.; Low molecular weight sodium polyacrylate is a water-soluble polymer electrolyte, which is widely used as boiler scale and scale inhibitor, pigment dispersant, chemical fiber sizing agent, metal material quenching agent, detergent auxiliary, granular pesticide carrier, etc. It is also widely used in printing industry, plastic industry, medicine, pharmacy and metal recovery of metal ion waste liquid. [0003] Studies have shown that the smaller the molecular weigh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/06C08F2/40C02F5/10D06M15/263D06M13/165D06M13/392D06M11/13D06M101/06
CPCC08F120/06C08F2/40C02F5/10D06M15/263D06M13/165D06M13/392D06M11/13D06M2200/20D06M2101/06Y02E60/10Y02P10/20
Inventor 陈思思尹用飞何新耀李玉博
Owner JIAHUA CHEM TECH DEV SHANGHAI CO LTD
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