Water-absorbent resin (SuperAdsorbentResin referred to as SAR), also known as (SuperAdsorbentPolymer referred to as SAP) is a water-swellable polymer that contains strong hydrophilic groups such as carboxyl groups and hydroxyl groups and has a certain degree of crosslinking. It is insoluble in water and also It is insoluble in organic solvents, has unique water absorption and water retention properties, and has the advantages of polymer materials. The peculiar performance of SAR has aroused great interest. With the deepening of development and research, the application field of this new functional polymer material is rapidly expanding and has penetrated into various fields of the national economy.
The manufacture of physiological and sanitary products is a relatively mature field in the application research of superabsorbent resins, and it is currently the largest market, accounting for about 70% of the total. SAR can be used for baby disposable diapers, astronaut diapers, feminine sanitary napkins, napkins, handkerchiefs, bandages, absorbent cotton, surgical pads, etc.; in addition, it can also take advantage of the slow release of resin, as a carrier material for fragrances and deodorants , To achieve the effect of aromatic deodorization; using thickening, it can also be used to thicken cosmetics, detergents, water-based paints, etc.
Because of its good water absorption capacity and water retention, the super absorbent resin is used as a soil water retention agent in agriculture. As long as 0.1% superabsorbent resin is mixed in the soil, the dryness and wetness of the soil will be well adjusted, which will make the crops grow vigorously, increase the yield and save labor. When the water is too much, the resin will absorb the excess water, and when it is dry, it will release the water, which is especially important in water-scarce areas. Directly covering the cable with high water-absorbent resin or making the cable to cover the cable can prevent the water from invading the cable. At present, it is expanding applications in power cables and communication cables, especially in the fiber optic cable. It has a broad market. In terms of packaging, superabsorbent resin can be used for packaging and transportation of dangerous goods, high- and intermediate-level laboratory chemicals, flowers and plants; it can also be used for food packaging, such as using superabsorbent resin as a cushion for meat food Tablets to prevent liquid from flowing out when taken out of the bag. In addition, dry granular superabsorbent resin can be used to absorb spilled or leaking oils and acids and other corrosive substances. It can also be used for dehydration of oils, resin additives, fillers and solvents, as well as absorption of cold storage agents, air filtration, anti-static sealing, etc. aspect.
Since the superabsorbent resin has a strong water absorption capacity without absorbing the characteristics of hydrophobic hydrocarbons, it can be mixed with inorganic or organic lipids to form a composite material, and the water injection wells and oil production wells can be treated to improve The water absorption capacity of the low-permeability layer reduces the water output.
The polymer water-absorbent resin is mixed with natural rubber or synthetic rubber, and other necessary substances of rubber, such as fillers, modifiers, vulcanizing agents and other additives, are processed to form a sealing material, which is in contact with water , High degree of expansion, maintain good mechanical strength, and has strong resistance to strong acids and alkalis. Therefore, it can be used for house water and sealing of oil and gas pipelines buried underground or pipelines floating on water.
The oil well is acidified and saturated. Adding a small amount of acrylamide-acrylic acid copolymer gel cross-linked with acetaldehyde can reduce the release of acid liquid, which is beneficial to the deep acidification of the formation. Gel resin can also be used as a diverting agent for acidizing liquid. The acid liquid is allowed to enter the low-permeability layer to improve the oil recovery rate. It is used as a gelling agent in hydraulic fracturing and tertiary oil recovery. It can also be used as a curing agent for spent drilling fluid.
SAR can be used as a medical test strip that can maintain the solution being tested; a large amount of water and a comfortable external ointment; a wound bandage that can absorb exudate and prevent infection and suppuration; can absorb blood and secretions while maintaining breathing Plugs for nasal cavity, etc.; also use its drug retention as a base for sustained-release drugs; can also be used as a filter material for artificial kidneys to regulate the moisture of blood; can also use its film-forming properties to make water vapor permeability, Artificial skin with excellent bacterial filterability and drug retention; the water film formed by it has good lubrication and can be used for gastroscopy and artificial esophagus; the most important thing is that it can be used for artificial organs, and now has polymethacrylic acid After crosslinking and saponification of hydroxyethyl ester, it is directly used as the body material of contact lenses; the artificial kidney containing SAR has good antithrombotic properties.
SAR has great application prospects in desert management and surface soil greening. For example, if SAR is formulated into a 0.3%~0.4% gel solution and buried in a 10~15cm deep desert, it can be planted with vegetables and general crops; In the case of roads and dams, the topsoil is often removed to form a rock slope, which is susceptible to soil erosion caused by wind and rain. The grass seeds and slow-release fertilizer are included in the SAR-containing nonwoven fabric drain net, and then fixed on the rock mountain to cover the vegetation with a slope to serve as topsoil. Greening.
SAR can also be used as liquid chromatography stationary phase, ultraviolet absorber, casting adhesive, cabin moisture absorbent, battery anode gelling agent, paper sizing agent, fiber moisture absorbent, enzyme fixative, fire gel coating, water encounter Expansion toys, roof materials, pesticide carriers, etc.