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Copyright of Plastics Science & Technology / Suliao Ke-Ji is the property of Plastics Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to verify the possibility and reliability of water absorption resin as cement grouting stopper, the water absorption performance of water absorption resin in different slurry environments was tested. The results show that the water absorption ratio of water absorption resin in different liquid media is: distilled water > tap water > physiological saline > ordinary cement slurry filtrate > expansive cement of pulp filtrate; in the first five minutes, the water absorption rate of normal saline is the fastest. After five minutes of water absorption, the absorption rate of all kinds of slurries has reached more than 50% of their ultimate water absorption rate. In the first 10 minutes, the absorption rate of distilled water is the fastest. After 10 minutes of water absorption, the absorption rate of all kinds of slurries has reached more than 80% of their ultimate water absorption rate. After 13 days of water loss, the water retention rate of tap water is 77%, the cement slurry retention rate is 74%; the water retention rate is 77%. The larger the water cement ratio of the slurry, the slower the formation of the dry cement layer contacting with the absorbent resin. The dry cement layer hinders the transfer of water to the absorbent resin. The water-absorbing resin used as the stopping plug of drilling grouting can greatly reduce the compressive strength of the cement in contact with it, and the influence range is about 100 mm.

In this paper, maleic anhydride (MA) was grafted onto methyl cellulose (MC) and then reacted with acrylic acid to synthesize a high gel strength and fast water absorption resin (AA-co-MC-g-MA) by UV polymerization. The reaction conditions of maleylated methylcellulose (MC-g-MA) were investigated, including the ratio of MC to MA, reaction time and catalyst amount. In addition, the reaction conditions for the synthesis of super absorbent resin were as follows: the amount of MC-g-MA, the degree of substitution of MC-g-MA, polymerization time, and the amount of initiator. Under optimal conditions, the maximum water absorption volume of synthetic resin was 2116 g/g, and the maximum salt absorption rate was 139 g/g. The water absorption resin prepared this time had high water absorption, water retention, excellent pH sensitivity, etc. It was hoped that it will have a good application prospect in the field of industrial production and agriculture in the future.

Copyright of Chemistry & Industry of Forest Products is the property of Chemistry & Industry of Forest Products Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)