A continuous production process of water-absorbent resin particles and water-absorbent resin particles

CN120535697BActive Publication Date: 2026-10-16CHINA TIANCHEN ENGINEERING CORPORATION LTD
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Patent Information

Application Number
CN202510716066.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-05-30
Publication Date
2026-10-16
Estimated Expiration
2045-05-30

AI Technical Summary

Technical Problem

现有技术常通过调节烯键式不饱和单体水溶液浓度、内部交联剂浓度、后交联（表面交联）工艺等方式进行吸水性树脂性能的综合优化，但这些方法对于自由吸收量和加压吸收量的均衡提升效果并不够令人满意

Benefits of technology

[0041] Compared with existing technologies, the beneficial effects of this invention are as follows: The continuous preparation process of the water-absorbing resin particles of this invention controls the particle size of the product after the first polymerization reaction within a specific particle size range. After the first polymerization reaction, a specific proportion of water contained in the reacted material is separated and swelled, which facilitates the entry of monomers into the polymer during the second polymerization reaction, forming a stable cross-linked network and a uniform particle structure. This improves the free water absorption and pressurized water absorption properties of the prepared water-absorbing resin particles, ensuring that they do not disintegrate into a primary structure after swelling in water and retain their original secondary structure. The water-absorbing resin particles of this invention have excellent free and pressurized absorption capacities, and their pressurized absorption stability is high, making them widely applicable in the market. The continuous preparation process of the water-absorbing resin particles of this invention simplifies the process flow and improves production efficiency.

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Abstract

The application provides a continuous preparation process of water-absorbing resin particles and the water-absorbing resin particles, which comprises the following steps: (1) dispersing a surfactant in a hydrocarbon dispersing medium, and then adding a first monomer aqueous solution, a first initiator, a first crosslinking agent and a first thickening agent to carry out a first polymerization reaction; wherein the mass of the first thickening agent is 0.002% to 0.02% of the mass of the first monomer, so as to control the particle size of the product of the first polymerization reaction to be 50 to 900 microns; (2) separating and removing 50% to 80% of the water contained in the material after the first polymerization reaction, and carrying out swelling treatment; (3) adding a second monomer aqueous solution and a second initiator to carry out a second polymerization reaction; and after the reaction is completed, the water-absorbing resin particles are obtained through separation and drying. The water-absorbing resin particles have excellent free absorption capacity and pressurized absorption capacity, and the stability of the pressurized absorption is high, and the market application value is high; the continuous preparation process simplifies the process flow and improves the production efficiency.
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