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Preparation method of polyacrylic acid cross-linked resin

A technology of cross-linked resin and polyacrylic acid, which is applied in the preparation of polyacrylic acid cross-linked resin and polyacrylic acid cross-linked carbo resin, to achieve the effect of improving product yield and product quality, large activity space and long chain

Active Publication Date: 2022-01-07
SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing synthesis technology of polyacrylic acid cross-linked copolymers has certain advantages. However, considering the economical and safety aspects of industrialization, it is still necessary to continue to develop more optimized synthesis methods.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 (with phosphoric anhydride as dehydrating agent)

[0029] At room temperature, weigh 800.0g of industrial-grade raw materials acrylic acid (0.18% water content) and 1440.0g of cyclohexane, stir and mix thoroughly, pour into drying equipment, add 5.2g of phosphoric anhydride (phosphorus pentoxide) for dehydration, static After standing for 10~30min, pump the acrylic acid cyclohexane solution (tested water content: 78ppm) from the top of the drying device into the dripping kettle with nitrogen, and weigh 4.1g pentaerythritol triallyl ether, 4.7g Azobisisobutyronitrile was added to the above-mentioned dropping kettle, fully stirred evenly; the drip valve at the bottom of the dropping kettle was opened, and the above-mentioned mixed solution was dripped into the drying reactor containing 3360g cyclohexane at a constant speed, and the dropping reaction temperature was controlled to be 77±2°C, during the dropping process, white matter precipitated out continuousl...

Embodiment 3

[0035] At room temperature, weigh 500.0g of industrial-grade raw materials acrylic acid (moisture content: 0.18%) and 1200.0g of cyclohexane, stir and mix well, pass through the three-stage series drying column filled with activated 3a-zeolite molecular sieve at a uniform speed, the total column The length is 3m, and the acrylic acid cyclohexane solution flowing out from the end of the drying column enters the dripping kettle with nitrogen gas (the detected water content is 81ppm); respectively weigh 3.0g of pentaerythritol triallyl ether and 9.4g of perlauroyl perlauroyl to the above In the dripping kettle, stir well and evenly; open the dripping valve at the bottom of the dripping kettle, drop the above mixed solution into the dry reaction kettle filled with 1800g cyclohexane at a uniform speed, control the dropping reaction temperature at 80±2°C, the dropping process White substances were continuously formed in the system, and the turbidity of the system gradually increased;...

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PUM

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Abstract

The invention discloses a preparation method of polyacrylic acid cross-linked resin, which comprises the following steps: (1) uniformly mixing acrylic acid and a solvent, and transferring into a dropwise adding kettle; (2) respectively and sequentially adding a cross-linking agent and an initiator into the dropwise adding kettle, and fully and uniformly mixing for later use; (3) adding the rest solvent into a dry reaction kettle, stirring, heating and dropwise adding the prepared mixed solution; and (4) after dropwise adding, carrying out heat preservation reaction, and carrying out cooling, suction filtration and negative pressure drying on the material to obtain a white fluffy solid product. According to the method, phosphorus pentoxide, a molecular sieve or resin and the like are selected as drying agents, rapid water removal of materials can be achieved, operation of industrial production is facilitated, and the production period is shortened; meanwhile, negative-pressure high-temperature drying is adopted, further polymerization of free monomers coated in the precipitation polymerization process is facilitated, the content of the free monomers in a finished product is reduced, and the product yield and the product quality are improved; washing is not needed in the preparation process, solvent consumption is reduced, and waste liquid is avoided.

Description

technical field [0001] The invention belongs to the technical field of macromolecule crosslinking polymerization, in particular to a preparation method of polyacrylic acid crosslinked resin, in particular to a preparation method of polyacrylic acid crosslinked carbo resin. Background technique [0002] Carboresin, which is cross-linked and polymerized by acrylic acid or acrylate and pentaerythritol triallyl ether or allyl sucrose ether, is an acrylic polymer with a certain degree of cross-linking and network structure, and is usually used to regulate liquid Viscosity, improve the thixotropic properties of the gel system and improve the stability of the product. At the same time, because carbomer resin has higher purity, better thickening effect and longer storage life than natural resin, and has strong antibacterial properties, it has no obvious irritation and allergic reaction to human skin, and is widely used in medicine, daily cosmetics and other fields. [0003] In the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F216/12C08F2/00C08F2/06
CPCC08F220/06C08F2/00C08F2/06C08F216/125
Inventor 程终发申义驰殷昂陆久田王东海
Owner SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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